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Page 23 of The information about the site of work and site conditions in the Tender Documents is given in good faith for guidance only but the Contractor shall satisfy himself regarding all aspects of site conditions. The quarry charts enclosed with the Tender Documents indicate the location of quarries and other sources from which naturally occurring materials are available, for guidance of the Contractor. The leads indicated in the said charts are only approximate. It is assumed that the Contractor has inspected the quarries, borrow-areas etc.
The Contractor shall establish working Bench Marks tied with the Reference Bench Mark in the area soon after taking possession of the site. The Reference Bench Mark for the area shall be as indicated in the Contract Documents and the values of the same shall be obtained by the Contractor from the Engineer.
The working Bench Marks shall be at the rate of four per km and also at or near all drainage structures, over- bridges and underpasses. Checks must be made on these Bench Marks once every month and adjustments, if any, got agreed with the Engineer and recorded. An up-to-date record of all Bench Marks including approved adjustments, if any, shall be maintained by the Contractor and also a copy supplied to the Engineer for his record.
The lines and levels of formation, side slopes, drainage works, carriageways and shoulders shall be carefully set out and frequently checked, care being taken to ensure that correct gradients and cross-sections are obtained everywhere.
In order to facilitate the setting out of the works, the centre line of the carriageway or highway must be accurately established by the Contractor and approved by the Engineer.
It must then be accurately referenced in a manner satisfactory to the Engineer, every 50 m intervals in plain and rolling terrains and 20 m intervals in hilly terrain and in all curve points as directed by the Engineer, with marker pegs and chainage boards set in or near the fence line, and a schedule of reference dimensions shall be prepared and supplied by the Contractor to the Engineer.
These markers shall be maintained until the works reach finished formation level and are accepted by the Engineer. On construction reaching the formation level stage, the centre line shall again be set out by the Contractor and when approved by the Engineer, shall be accurately referenced in a manner satisfactory to the Engineer by marker pegs set at the Page 24 of outer limits of the formation.
No reference peg or marker shall be moved or withdrawn without the approval of the Engineer and no earthwork or structural work shall be commenced until the centre line has been referenced. The Contractor will Be the sole responsible party for safe-guarding all survey monuments, bench marks, beacons, etc. The Engineer will provide the Contractor with the data necessary for setting out of the centre line.
See, that’s what the app is perfect for.
All dimensions and levels shown on the drawings or mentioned in documents forming part of or issued under the Contract shall be verified by the Contractor on the site and he shall immediately inform the Engineer of any apparent errors or discrepancies in such dimensions or levels.
The Contractor shall in connection with the staking out of the centre line, survey the terrain along the road and shall submit to the Engineer for his approval, a profile along the road centre line and cross-sections at intervals as required by the Engineer. After obtaining approval of the Engineer, work on earthwork can commence and the profile and cross-sections shall form the basis for measurements and payment.
The Contractor shall be responsible for ensuring that all the basic traverse points are in place at the commencement of the contract and if any are missing, or appear to have been disturbed, the Contractor shall make arrangements to re-establish these points. A Survey File containing the necessary data will be made available for this purpose. If in the opinion of the Engineer, design modifications of the centre line or grade are advisable, the Engineer will issue detailed instructions to the Contractor and the Contractor shall perform the modifications in the field, as required, and modify the ground levels on the cross-sections accordingly as many times as required.
There will be no separate payment for any survey work performed by the Contractor. The cost of these services shall, be considered as being included in the cost of the items of work in the Bill of Quantities. The work of setting out shall be deemed to be a part of general works preparatory to the execution of work and no separate payment shall be made for the same.
Precision automatic levels, having a standard deviation of 2 mm per km, and fitted with micrometer attachment shall be used for all double run levelling work. Setting out of the road alignment and measurement of angles shall be done by using theodolite with traversing target, having an accuracy of one second.
Measurement of distances shall be done preferably using precision instruments like Distomat. This shall be done with the help of temporary traffic signals or flagmen kept positioned on opposite sides during all hours.
Before taking up any construction.
One-way traffic operation shall be established whenever the traffic is to be passed over part of the carriageway inadequate for two-lane traffic. On both sides. Distances upto and including m shall be measured in units of 50 m. Levels shall be taken before and after construction. Measurement of Lead for Materials Where lead is specified in the Contract for construction-materials. Different items of work shall be measured in accordance with the procedures set forth in the relevant sections read in conjunction with the General Conditions of Contract.
General All measurements shall be made in the metric system. For pavement courses laid only over widening portions. In this regard. All measurements and computations.
Suitable references for the transverse grid lines should be left in the form of embedded bricks on either ends or by other means so that it is possible to locate the grid points for level measurements after each successive course is laid.
The same shall not. For multi- lane roads. In recording dimensions of work. Notwithstanding the above. Prior to the use of the scales and as frequently thereafter as the Engineer may deem necessary to ensure accuracy. Measurement of Bituminous Courses for Payment on Weight Basis Plant-mixed bituminous materials for pavement courses where designated to be paid on weight basis shall be weighed on accurate scales approved by the Engineer.
In the absence of any directions to the contrary. Location of the scales shall be as designated by the Engineer. Trucks used for hauling the material to be weighed shall be weighed empty daily at such times as the Engineer directs. Approved scales shall mean scales that are of size. The average thickness of the pavement course in any area shall be the arithmetic mean of the difference of levels before and after construction at all the grid points falling in that area. Checking of Pavement Thickness for Payment on Area Basis Where payment for any bituminous course in Section is allowed to be made on area basis.
Page 31 of The factor for conversion from volume measurement to weight measurement shall be computed from representative density of the compacted material at site determined at locations approved by the Engineer. For materials specified to be measured by weight. For item rate contracts. As supplement to level measurements. The Contractor shall liaise with such agencies and adjust his Page 32 of The item rates quoted by the Contractor shall.
The Employer will be indemnified by the Contractor for any claims from other agencies on this account. Even in that case the load and intensity of construction traffic should be so regulated that no damage is caused to the subgrade or pavement layers already constructed.
Bituminous base course shall be kept clean and uncontaminated as long as the same remains uncovered by a wearing course or surface treatment. Should the base course or tack coat on the base course become contaminated. Programme relating to pavement and shoulder construction shall be ari integrated activity to be done simultaneously in a coordinated manner.
The wheels or tracks of plant moving over the various pavement courses shall be kept free of deleterious materials. The methodology and the sequence shall be so planned as to provide proper safety. Where necessary. T or equivalent Godrej Model for the Engineer No. Item Specification Nos. ST-2 or equivalent Page 34 of Scope The work covers the construction and provision of furnished site office accommodation for the supervisory staff of Engineer and maintaining the same.
Executive table Make. I For the Engineer. T or equivalent. Head Clerk and visitors PCH or equivalent Table for Site Engineer. Work includes providing electric supply. Stool Maka-Godrej Model No. Table for all other staff Make-Godrej Model No. Description The Contractor shall arrange to provide fully furnished office accommodation constructed as shown in drawings.
CHR-6 or equivalent Table CHR-6 or equivalent. The Contractor shall provide the office accommodation within 4 months from the date of the commencement of work or 3 months from the date of providing the land and the working drawings for the construction of office accommodation. Page 35 of Maths coprocessor. Ceiling Fans Ceiling fans shall be of mm size approved make and colour Bajaj make or equivalent Two disc drives of 5.
Computer with printer PC with hard disc capacity MB. Sheets mm of Godrej make Khaitan or Cool Home make or equivalent Room Healers The heaters shall be of W capacity. All sources. Measurements for Payment The measurement for construction and provision of site office shall be in square metres of the plinth area of the office accommodation and the payment shall be made after the completion and handing over of the buildings with connected services fully furnished including office equipment for occupation.
If the Contract works are not completed within the stipulated period or within the granted extended time of completion. Ownership The site office with all services. The land for the sites office shall be provided by -the Engineer and the location shall be as indicated in the Drawings. If the Contractor fails to hand over the furnished office accommodation within the period stipulated under Clause In addition.
Rate The Contract unit rate for constructing and providing the site office accommodation shall include the expenses of all the operations involved in construction Page 36 of Maintenance The Contractor shall arrange to maintain the site office until the issue of Taking over Certificate for the complete work.
If at any stage. In case of any failure by the Contractor to do so. Maintenance includes the day to day upkeep of the building and the surroundings. The Contract unit rate for maintenance shall include expenses towards all items of works detailed in Clause Description The Contractor shall arrange to provide fully furnished and adequately equipped field laboratory constructed as shown in drawings.
The floor space requirement for the field laboratory shall be as indicated in the drawing. General i Oven. Electrically operated. No 7 of Table shall also be provided. The field laboratory shall preferably be located adjacent to the site office of the Engineer and provided with amenities like water supply. It shall include office space for the Materials Engineers.
The furnishing in each of two offices of the Materials Engineers shall be as provided for the Site Engineer in Table Page 37 of The remaining space shall be provided for the installation of equipment. Atleast 4 racks of slotted angles and M. Scope The work covers the provision and maintenance of an adequately equipped field laboratory as required for site control on the quality of materials and the works.
Laboratory Equipment The following items of laboratory equipment shall be provided in the field laboratory. The Contract lumpsum rate for the supply. Page 38 of As required steel scales. Scope The work covers the provision and maintenance of unfurnished site residential accommodation for the Engineer and other supervisory staff.
The Contractor shall arrange to provide residential accommodation constructed as shown in the drawings. For soils and aggregates i Riffle Box 1 No. Measurement for Payment The measurement for construction of the residential accommodation shall be on square metres of plinth area of the accommodation.
In case of failure of main water or power supply. The Contractor shall arrange to provide uninterrupted supply of electricity and water for the buildings. If the Contractor fails to complete and hand over the complete residential accommodation within the period stipulated under Clause The payment shall be made after the residential accommodation. Ownership The site residential accommodation with all services and fittings etc. Maintenance The Contractor shall arrange to maintain the supervisory staff residential accommodation until the issue of Taking Over Certificate for the complete work.
If at any stage the Contractor fails to carry out the required maintenance satisfactorily. Maintenance includes attending to repairs to various parts of the building. The Contractor shall provide the residential accommodation within 4 months from the date of commencement of the work or 3 months from the date of providing land and the. The measurement for maintenance of supervisory staff residential accommodation shall be in maintenance months and shall be made on completion of satisfactory maintenance every month.
In case of any failure by the Contractor Page 39 of The land for the residential accommodation shall be provided by the Engineer and the location shall be as indicated by the Engineer.
The Contract unit rate for maintenance shall include the expenses for -all items of work detailed in Clause The Contractor shall provide the complete wireless system within 12 months from the date of commencement of work or 8 months from the date on which frequency is allotted to him by the Govt. Rate The Contract unit rate for constructing and providing residential accommodation for the Engineer and other supervisory staff shall include cost of all the operations involved in construction of buildings and connected services and fittings.
The system shall consist of the following: Mobile Antenna with Cable and External Speaker assembly 3 W audio output with all necessary fittings and accessories. Approval The Contractor shall arrange to obtain all necessary statutory approvals from various Government bodies for operating the system.
Supply The Contractor shall arrange to supply. He shall also fulfil the requirements laid down by various Government Departments and obtain the frequency to operate the wireless system Page 40 of The Contract unit rate for the maintenance of wireless system shall be payment in full for carrying out periodic servicing and checking of the system.
Maintenance The Contractor shall arrange to maintain the entire wireless system including the mobile and base trans-receivers and all accessories until the issue of the Taking Over Certificate for the complete work. If die Contract Works are not completed within the stipulated period or within granted extended time of completion. If the Contractor fails to carry out the required maintenance as directed by the Engineer at any stage of work.
If the Contractor fails to commission and hand over the complete wireless system in the stipulated time. On issue of the Taking Over Certificate after obtaining clearance from the Engineer. Page 41 of IB addition. Rates The Contract unit rate for the supply and installation of wireless system shall cover all the expenses towards the supply of all necessary items and expenses towards obtaining statutory approvals and operating frequency.
Measurements for Payment The measurement for supply and installation of wireless system. In such cases-the instructions for non-use of vehicle shall be given in writing 15 days in advance and the withdrawal of vehicles shall not be for a period of less than 15 days continuously at a tune. In case of vehicles of foreign make approved by the Engineer. In case of vehicles of Indian make.
If the Contractor at any time fails to provide vehicles or substitute vehicle s as specified above. All expenses required for keeping the vehicles in smooth running condition such as fuel. Description The passenger cars shall be petrol or diesel driven and may be Ambassador or equivalent having cylinder capacity of minimum cc.
Maintenance The vehicles shall be maintained in a smooth running condition. Also the number of days for which the vehicle s were not provided shall not be included for payment. The vehicles shall be provided day and night as required by the Engineer. The Contractor shall also make available drivers having valid licence at such times and for such duration as instructed by the Engineer. The number of vehicles to be provided by the Contractor shall be decided by the Engineer at various times.
In the event of any vehicle being off the road for maintenance or on account of breakdown. The vehicles shall be provided and maintained until issue of the Taking Over Certificate for the complete Work. If the Contract Works are not completed within the stipulated period or within the granted extended time of completion. The Contractor shall provide within one month from the date of order by the Engineer.
Ail necessary taxes for operating the vehicles shall be fully paid and all necessary papers shall be provided as required by prevailing Motor Vehicles Act with comprehensive insurance cover for the vehicles. Measurements for Payment The payment for providing and maintaining vehicles shall be on vehicle day basis Page 42 of Rates The Contract unit rate for providing and maintaining vehicles for Engineer shall include all expenses towards providing and keeping the vehicles in smooth running condition including taxes etc.
Measurements for Payment Supply of two copies of colour record photographs mounted in the albums and the negative thereof shall be measured in number of record photographs supplied. The Contractor shall supply two colour prints of each of the photographs taken to the standard postcard size mounted in albums of acceptable quality. The rate for additional colour prints shall similarly include all costs incurred. No payment shall be made for the period of withdrawal as per Clause The photographs and materials including negatives shall form a pan of the records of the Department and the prints of the same cannot be supplied to anybody else or published without the written permission of the Department.
Supply of additional prints of colour record photographs shall be measured in number of additional prints supplied.. Each photograph in the album shall be suitably captioned. Page 43 of Rate The rate for the supply of record photographs shall include the cost of taking the photographs. Scope The work covers the supply of photographs.
Also the negative in 35 mm size shall be supplied for each photograph. The photographs shall be of acceptable quality and they shall be taken by a professionally competent photographer with camera having the facility to record the date of photographs taken in the prints and negative. The video cassettes shall be of acceptable quality and the film shall be capable of producing colour pictures. Page 44 of Measurements for Payment The measurement shall be by number of sets of edited master cassettes each with four copies thereof.
Rates The contract unit rate shall include all expenses for making video films with the help of a professionally competent photographer. The edition of the video film and the script for narration shall be as approved by the Engineer. It shall contain narration of the activities in English by a competent narrator. Description The work consists of taking video films of important activities of the work as directed by the Engineer during the currency of the project and editing them to a video film of playing time not less than 60 minutes and upto minutes as directed by the Engineer.
All excavations below the general ground level arising out of the removal of trees. All branches of trees extending above the trimmed as directed by the Engineer. The dozer shall have ripper attachments for removal of tree stumps. Clearing and grubbing shall be performed in advance of earthwork operations and in accordance with the requirements of these Specifications.
All trees. Before start of operations. Ant-hills both above and below the ground. Tools and Equipments Only such methods. Page 46 of During clearing and grubbing. Scope This work shall consist of cutting. The Contractor shall. It shall include necessary excavation. On areas beyond these limits. Page 47 of Stacking of stumps.
Rates Disposal of Materials All materials arising from clearing and grubbing operations shall be the property of Government and shall be disposed of by the Contractor as hereinafter provided or directed by the Engineer. Cutting of trees upto mm in girth including removal of stumps and roots. The Contract unit rates for the various items of clearing and grubbing shall be payment in full-for carrying out. Also boulders. Measurements for Payment Clearing and grubbing for road embankment.
These will also include removal of stumps of trees less than mm in girth as well as stumps left over after cutting of trees carried out by another agency. Clearing and grubbing of borrow areas shall be deemed to be a part of works preparatory to embankment construction and shall be deemed to have been included in the rates quoted for the embankment construction item and no separate payment shall be made for the same.
Removal of stumps left over after trees have been cut by any other agency shall also be considered incidental to the clearing and grubbing operations. Care shall be taken to see that unsuitable waste materials are disposed of in such a manner that there is no likelihood of these getting mixed up with the materials meant for embankment. All products of clearing and grubbing which. Unless otherwise specified. Steel structures shall.
Scope This work shall consist of removing. Existing culverts. Pipe culverts shall be carefully removed in such a manner as to avoid damage to the pipes.
If specified in the drawings or directed Page 48 of The Contract unit rate for cutting including removal of stumps and roots of trees of girth above mm shall include excavation and backfilling to required compaction.
Dismantling Culverts and Bridges The structures shall be dismantled carefully and the resulting materials so removed as not to cause any damage to the serviceable materials to be salvaged. Removal of overlying or adjacent material. All operations necessary for the removal of any existing structure which might endanger new construction shall be completed prior to the start of new work.
Dismantling and removal operations shall be carried out with such equipment and in such a manner as to leave undisturbed. The connecting edges shall be cut. Due care should be taken to ensure that reinforcing bars which are to be left in place so as to project into the new work as dowels or ties arc not injured during removal of concrete.
Where a Contract does not include separate items of clearing and grubbing. Back-filling Holes and depressions caused by dismantling operations shall be backfilled with excavated or other approved materials and compacted to required density as directed by the Engineer.
Disposal of Materials All materials obtained by dismantling shall be the property of Government Unless otherwise specified. Pipe culverts that are removed shall be cleaned and neatly piled on the right-of- way at points designated by the Engineer with all lifts and lead upto m.
Structures or portions thereof which are specified in the Contract for re-erection shall be stored in separate piles. Structural steel removed from old structures shall. All concrete pavements. All materials obtained from dismantling operations which. Timber structures shall be removed in such a manner as to avoid damage to such timber or lumber as is designated by the Engineer to be salvaged.
Timber or lumber from old structures which is designated by the Engineer as materials to be salvaged shall have all nails and bolts removed therefrom and shall be stored in neat piles in locations suitable for loading.. Dismantling Pavements and Other Structures In removing pavements. Sufficient removal shall be made to provide for proper grades and connections with the new work as directed by the Engineer..
Page 49 of Page 50 of These will also include excavation and backfilling where necessary to the required compaction and for handling. Measurements for Payment The work of dismantling structures shall be paid for in units indicated below by taking measurements before and after. Rates The Contract unit rates for the various items of dismantling shall be paid in full for carrying out the required operations including full compensation for all labour. Erosion Control and Drainage Earthwork.
Erosion Control and Drainage Page 51 of Classification of Excavated Material Scope This work shall consist of excavation. It shall include the hauling and stacking of or hauling to sites of embankment and subgrade construction. All materials involved in excavation shall be classified by the Engineer in the following manner: Removal of gravel or any other nodular material having dimension in any one direction not exceeding 75 mm occurring in such strata shall be deemed to be covered under this category.
Page 52 of The excavations shall conform to the lines. No backfilling shall be allowed to obtain required slopes excepting that when boulders or Page 53 of All excavations shall be carried out in conformity with the directions laid here-in-under and in a manner approved by the Engineer.
While planning or executing excavations. The Contractor shall be responsible for the maintenance of bench marks and other marks and stakes as long as in the opinion of the Engineer. The Contractor shall provide all labour. Setting out: After the site has been cleared as per Clause Stripping and storing topsoil: When so directed by the Engineer. Construction Operations Prior to stripping the topsoil.
Authority for classification: The classification of excavation shall be decided by the Engineer and his decision shall be final and binding on the Contractor. Merely the use of explosives in excavation will not be considered as a reason for higher classification unless blasting is clearly necessary in the opinion of the Engineer.
The work shall be so done that the suitable materials available from excavation are satisfactorily utilized as decided upon beforehand. Subject to the permitted tolerances. The Contractor shall not excavate outside the limits of excavation. All debris and loose material on the slopes of cuttings shall be removed. In all cases. Excavation of marshes shall begin at one end and proceed in one direction across the entire marsh immediately ahead of backfilling.
While doing so. If trees were removed. Where blasting is to be resorted to. Rocks and large boulders which are likely to cause differential settlement and also local drainage problems should be removed to the extent of mm below the formation level in full formation width including drains and cut through the side drains. In works involving widening of existing pavements or providing treated shoulders. Rock excavation: The method and sequence of excavating and backfilling shall be such as to ensure.
Slopes in rock cutting shall be finished to uniform lines corresponding to slope lines shown on the drawings or as directed by the Engineer. Marsh excavation: If the existing pavement gets disturbed or loosened. After excavation.
The cost of planting new trees shall he deemed to be incidental to die work. Notwithstanding the foregoing. Where presplitting is prescribed to be done for the establishment of a specified slope in rock excavation. If so desired by the Engineer. Only such methods.
Where excavation is done to levels lower than those specified. If slips. Disposal of excavated materials: All the excavated materials shall be the property of the Employer. Unsuitable and surplus material not intended for use within the lead specified above shall also. If finished slopes slide into the roadway subsequently.
All hard materials. Page 55 of The classification of the debris material from the slips. Due to any negligence on the part of the Contractor.. If water is met with in the excavations due to springs. Care shall be taken to discharge the drained water into suitable outlets as not to cause damage to the works.
Adequate precautions shall be taken to ensure that during construction. The material obtained from the excavation of roadway. In no case shall any portion of the slope encroach on the loadway. Plying of Construction Traffic Construction traffic shall not use the cut formation and finished subgrade without the prior permission of the Engineer. Preservation of Property The Contractor shall undertake all reasonable precautions for the protection and preservation of any or all existing roadside trees.
Finishing Operations Finishing operations shall include the work of properly shaping and dressing all excavated surfaces. The unsuitable material shall be disposed of in accordance with Clause After satisfying the density requirements. The finished cut formation shall satisfy the surface tolerances Described in Clause Preparation of Cut Formation The cut formation.
Page 56 of Where the material in the subgrade that is within mm from the lowest level of the pavement has a density less than specified in Table When completed. In rocky formations.
MORTH 5 th revision & Standard DATA Book xls
If the Contractor fails to do so. Any damage arising out of such use shall be made good by the Contractor at his own expense. Safety measures taken by the Contractor in this respect. Any unsuitable material encountered in the subgrade level shall be removed as directed by the Engineer and replaced with suitable material compacted in accordance with Clause Measurements for Payment Excavation for roadway shall be measured by taking cross-sections at suitable intervals in the original position before the work starts and after its completion and computing the volumes in cu..
When volumes are Slated in this manner for excavated material other than rock. The Contract unit rates for the items of roadway and drain excavation shall be payment in full for carrying out the operations required for the individual items including full compensation for: Suction made will be to the extent of 16 per cent of stacked volumes. The depth of topsoil shall be sufficient to sustain plant growth. For rock excavation. The Contractor shall see that these remain intact till the final measurements are taken..
Where directed. At the option of the Engineer. Where it is not feasible to compute volumes by this method of erratic location of isolated deposits.. Slopes may be roughened and moistened slightly. Works involved in the preparation of cut formation shall be measured in units indicated below: General Blasting shall be carried cut in a.
Clauses The Contractor may adopt any method or methods of blasting consistent with the safety and job requirements. The Contract unit rate for item of preparing rocky subgrade as per Clause Prior to starting any phase of the operation the Contractor shall provide information describing pertinent blasting procedures. The Contract unit rate for disposal of surplus ear from roadway and drain excavation shall be full compensation for all labour.
No matches or inflammable material shall be allowed in the magazine. The magazine for the storage of explosives shall be built to the designs and specifications of the Explosives Department concerned and located at the approved site.
The Contract unit rate for the items of stripping and storing topsoil and of reapplication of topsoil shall include full compensation for all the necessary operations including all lifts. No unauthorized person shall be admitted into the magazine which when not in use shall be kept securely locked. The following shall be hung in the lobby of the magazine: The Contract unit rate for loosening and recompacting the loosened materials at subgrade shall include full compensation for loosening to the specified depth.
All the statutory laws. Page 58 of It shall be done only with the written permission of the Engineer. The magazine shall have an effective lightning conductor. In addition to these. The Engineer may specify the type of explosives to be allowed in special cases. Blasting Operations The blasting shall be carried out during fixed hours of the day preferably during the mid-day luncheon hour or at the close of the work as ordered in writing by the Engineer.
The rate of burning of the fuse shall be uniform and definitely known to permit such a length being cut as will permit sufficient time to the firer to reach safety before explosion takes place. All explosives shall be stored in a secure manner in compliance with all laws and ordinances. Where no local laws or ordinances apply. Tools and Equipment All the materials. The flags shall be planted m from the blasting site in all directions. The blasting powder. The Contractor shall notify each public utility company having structures in proximity to the site of the work of his intention to use explosives.
Detonators shall be capable. Any method of blasting which leads to Page 59 of In advance of any blasting work within 50 m of any railway track or structures. Such notice shall be given sufficiently in advance to enable the companies to take such steps as they may deem necessary to protect their property from injury. The hours shall be made known to the people in the vicinity. Red danger flags shall be displayed prominently in all directions during the blasting operations.
Blasting should be as light as possible consistent with thorough leakage of the material necessary for economic loading and hauling.
The fuse to be used in wet locations shall be sufficiently water-resistant as to be unaffected when immersed in water for 30 minutes. Personnel The blasting operation shall remain in the charge of competent and experienced supervisor and workmen who are thoroughly acquainted with the details of handling explosives and blasting operations. The charge holes shall be drilled to required depths and at suitable places. All the charges shall be prepared by the man in charge only.
They shall be inspected before use and damaged articles shall be discarded totally and removed from the site immediately. Boreholes shall be of such size that the cartridge can easily go down.
The primer shall be housed into die explosive. The charges shall be lighted by the man- in-charge only. If a misfire has been found to be due to defective detonator or dynamite. Misfire In case of misfire. A new hole shall be drilled at about mm from the old hole and fired. The man-in-charge shall count the number of explosions. He shall satisfy himself that all the charges have been exploded before allowing the workmen to go back to the work site.
A fresh detonator and primer shall then be used to blast the charge. The explosive powder shall then be covered with tamping material which shall be tamped lightly but firmly. All the people shall then be required to move to safe distances. Page 60 of Another hole may then be drilled mm away and parallel to it. This should blast the old charge.
The man in charge shall blow a siren in a recognised manner for cautioning the people. When blasting is done with dynamite and other high explosives. The paper of the cartridge shall then be closed up and securely bound with wire or twine. When blasting is done with powder.
At a time. After blasting operations. This hole shall then be charged and fired when the misfired hole should explode at the same lime. Should it not blast the old charge.
The space of about mm above the charge shall then be gently filled with dry clay. The holes shall be cleared of all debris and explosive inserted.
The powder shall be gently tamped with copper rods with rounded ends. Controlled blasting shall begin with a short test section of a length approved by the Engineer. The drill holes shall be not less than 60 mm nor more than 75 mm in diameter.
Particular care and attention shall be directed to the beginning and end of excavations to ensure complete removal of all overburden soil and weathered rock and to expose fresh rock to an elevation equal to the bottom of the adjacent lift of the presplitting holes being drilled.
Auxiliary drill holes along the presplit line. The drilling and blasting plan is for record purposes only and will not absolve the Contractor of his responsibility for using proper drilling and blasting procedures.
Except for spacing. The line of production holes shall be placed inside the presplit lines in such a manner as to avoid damage to the presplit face. General Presplitting is defined as the establishment of a specified excavation slope in rock by the controlled use of explosives and blasting accessories in properly aligned and spaced drill holes. Account A careful and day to day account of the explosive shall be maintained by the Contractor in an approved register and manner which shall be open to inspection by the Engineer at all times.
Slope holes for presplitting shall be drilled along the line of the planned. The test section shall be presplit. All overburden soil and weathered rock along the top of the excavation for a distance of about 5 to 15 m beyond the drilling limits.
The presplitting technique shall be used for forming rock excavation slopes at locations shown on the plans or as otherwise decided by the Engineer. The length of presplit holes for any individual lift shall not exceed 9 m.
Construction Operations Prior to starting drilling operations for presplitting. The spacing of presplit holes shall not exceed mm on centres and shall be adjusted to result in a uniform shear face between holes. Page 61 of If necessary. Drilling operations shall be controlled by the use of proper equipment and technique to ensure that no hole shall deviate from the plane of the planned slope by more than mm nor shall any hole deviate from being parallel to an adjacent hole by more than two-third of the planned horizontal spacing between holes.
As long as equally satisfactory presplit slopes are obtained. Page 62 of These shall be fired as recommended by the manufacturer. In either case the presplitting holes shall extend either to the end of the excavation or for a distance of not less than 15 m beyond the limits of the production holes to be detonated. No portion of any production hole shall be drilled within 2. Stemming may be required to achieve a satisfactory presplit face.
These tolerances shah be measured perpendicular to the plane of the slope. The drilling operations shall be adjusted to compensate for drift of previous levels and for the offset at the start of new levels to maintain the specified slope plane. Tolerances The presplit face shall not deviate more than mm from the plane passing through adjacent drill holes. Any blasting technique. Stemmed presplit holes shall be completely filled to the collar.
The bottom of the production holes shall not be lower than the bottom of the presplit holes. Rates The Contract unit rate for presplitting work shall be payment in full for carrying out the required operations for obtaining acceptable presplit slope surfaces.
All charges in each presplitting pattern shall be detonated simultaneously. In no case shall any portion of the slope encroach on the side drains. Ammonium nitrate composition blasting agents will not be permitted in presplitting operations. The maximum diameter of explosives used in presplit holes shall not be greater than one-half the diameter of the presplit hole.
A maximum offset of mm will be permitted for a construction working bench at the bottom of each lift for use in drilling the next lower presplitting pattern.
Only standard cartridge explosives prepared and packaged by explosive manufacturing firms shall be used in presplit holes.
Measurements for Payment The area of presplitting to be paid for will be measured as square metres of acceptable presplit slope surface. Stemming material shall be dry free-running material all of which passes The methods to be adopted in this regard and other details thereof shall be left to the choice of the Contractor but subject to approval of the Engineer.
Where blasting is likely to endanger adjoining foundations or other structures. Where the nature of soil or the depth of the trench and season of the year do not permit vertical sides. Dewatering and protection: After the site has been cleared according to Clause The depth to which the excavation is to be carried out shall be as shown on the drawings. Approval of the Engineer shall.
Scope Excavation for structures shall consist of the removal of material for the construction of foundations for bridges. Classification of Excavation All materials involved in excavation shall be classified in accordance with Clause Where water is met with in excavation due to stream flow.
Excavation shall be taken to the width of die lowest step of the footing and the sides shall be left plumb where the nature of soil allows it. Propping shall be undertaken when any foundation or stressed zone from an adjoining structure is within a line of 1 vertical to 2 horizontal from the bottom of the excavation.
Preparation of foundation: The bottom of the foundation shall be levelled both longitudinally and transversely or stepped as directed by the Engineer. All seams shall be denied out and filled with cement mortar or grout to the satisfaction of die Engineer. Before footing is laid. After pile driving operations in a given pit are completed. No pumping shall be permitted during the placing of concrete or for any period of at least 24 hours thereafter.
If it is determined beforehand that the foundations cannot be laid dry or the situation is found that the percolation is too heavy for keeping the foundation dry. For safety precautions. Where cofferdams are required. In the case of excavation in rock.
The interior dimensions of the cofferdams shall be such as to give sufficient clearance for the construction and inspection and to permit installation of pumping equipments.
If the depth of fill required is more than 1. At the discretion of the Contractor. The Contractor shall take all precautions in diverting channels and in discharging the drained water as not to cause damage to the works. In case of flowing water or artesian springs. The Contractor shall take adequate protective measures to see that the excavation operations do not affect or damage adjoining structures.
Public safety: Near towns. Pumping from the interior of any foundation enclosure shall be done in such a manner as to preclude the possibility of the movement of water through any fresh concrete.
When foundation piles are used. Ordinary filling shall not be used for the purpose to bring the foundation to level.
Slips and slip-outs: If there are any slips or slip-outs in the excavation. When rock or other hard strata is encountered. Page 64 of In the event of excavation having been deeper than that shown on the drawings or as otherwise ordered tie Engineer. Crops or any other property. The compaction shall be done with the help of suitable equipment such as mechanical tamper. The Contract unit rate for preparation of rock foundation shall be full compensation for cutting.
Disposal of surplus excavated materials: Clause Backfilling shall be done with approved material after concrete or masonry is fully set and carried out in such a way as not to cause undue thrust on any part of the structure. The Contract unit rate for transporting material from the excavation for structures shall be full compensation for all labour. Foundation sealing. Excavation over increased width. Preparation of rock foundation shall be measured in square metres. Measurements for Payment Excavation for structures shall be measured in cu.
Page 65 of The Contract unit rate for the items of excavation for structures shall be payment in full for carrying out the required operations including full compensation for: All space between foundation masonry or concrete and the sides of excavation shall be refilled to the original surface in layers not exceeding mm compacted thickness. General Part 40 shall not be used as a fill material.
The size of the coarse material in the mixture of earth shall ordinarily not exceed 75 mm when being placed in the embankment and 50 mm when placed in. Materials and General Requirements All embankments. Any fill material with a soluble sulphate content exceeding 1.
The materials used in embankments. Such materials shall be free of logs.
Physical requirements: Materials with a total sulphate content expressed as SO 3 exceeding 0. These Specifications shall apply to the construction of embankments including subgrades.
OH or Pt in accordance with IS: The following types of material shall be considered unsuitable for embankment: Borrow materials: Where the materials are to be obtained from designated borrow areas.
General requirements: Type of Work Maximum laboratory dry unit weight when tested as per IS: The work shall be so planned and executed that the best available materials are saved for the subgrade and the embankment portion just below the subgrade. The materials for embankment shall be obtained from approved sources with preference given to materials becoming available from nearby roadway excavation or any other excavation under the same. Page 67 of Embankments exceeding 3 metres Not less than Subgrade and earthen Not less than Embankments up to 3 metres Not less than Government of India and the local bodies.
The maximum particle size shall not be more than two-thirds pf the compacted layer thickness. Embankment Not less than 95 3. Haulage of material to embankments or other areas of fill shall proceed only when sufficient spreading and compaction plant is operating at the place of deposition. Borrowpits along the road shall be discouraged. Ridges of not less than 8 m width should be left at intervals not exceeding m. Small drains shall be cut through the ridges to facilitate drainage.
IBC of plants or siting of temporary buildings or structures. If permitted by the Engineer. It shall be ensured that the subgrade material when compacted to the density requirements as in Table shall yield the design CBR value of the subgrade.Scope This work shall consist of laying and compacting well-graded material on prepared subgrade in accordance with the requirements of these Specifications.
Structural steel removed from old structures shall. During wet weather. The Contractor will Be the sole responsible party for safe-guarding all survey monuments. While doing so. Fertilizer to the required quantities shall be spread and thoroughly incorporated into the soil surface as a part of the seed-bed preparation.
Type A grading allows a much wider range.
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