MORTH Specification Book 4th revision - Ebook download as Word Doc .doc), PDF File .pdf), Text File .txt) or read book online. MORTH Specification Book. MORTH Specification Book 4th Revision - Ebook download as PDF File .pdf), Text File .txt) or read book online. MORTH 4th rev. 4" **. This edition of the Specifications for Road and Bridge Works marks the Fifth Revision. In the last decade and a half, significant developments have taken.
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MORTH 4th, section INTRODUCTION. These Specifications shall apply to all such road and bridge works as are required to be. Aashto-a-policy-on-geometric-design-of-highways-and-streets - Type: PDF File, AASHTO A Policy on morth specifications 5th revision; morth specification. Works" (Fourth Revision, August ; Reprinted ), issued by the Ministry of the requirements of quality as stipulated in the MoRTH Specification for.
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The leads indi ated in the said harts are only appro i4ate. The Referen e Een h Mar, for the area shall be as indi ated in the Contra t o u4ents and the values of the sa4e shall be obtained by the Contra tor fro4 the! Che ,s 4ust be 4ade on these Een h Mar,s on e every 4onth and ad?
It 4ust then be a urately referen ed in a 4anner satisfa tory to the! These 4ar,ers shall be 4aintained until the wor,s rea h finished for4ation level and are a epted by the! The Contra tor shall in onne tion with the sta,ing out of the entre line, survey the terrain along the road and shall sub4it to the! If in the opinion of the! There will be no separate pay4ent for any survey wor, perfor4ed by the Contra tor. The ost of these servi es shall, be onsidered as being in luded in the ost of the ite4s of wor, in the Eill of Duantities.
Measure4ent of distan es shall be done preferably using pre ision instru4ents li,e isto4at. The inter4ediate stages of the wor,s are, however, un,nown at the design stage, these being di tated by the Contra torKs 4ethods of wor,ing. He shall abide by all laws, rules and regulations in for e governing pollution and environ4ental prote tion that are appli able in the area where the wor,s are situated.
The Contra tor shall ta,e every pre aution to redu e the levels of noise, vibration, dust and e4issions fro4 his plant and shall be fully responsible for any lai4s for da4ages aused to the owners of property, fields and residen es in the vi inity.
The Contra tor shall provide the! The Contra tor shall ta,e prior approval of the! The treat4ent to the shoulder shall onsist of providing atleast I67 44 thi , granular base ourse overed with bitu4inous surfa e dressing in a width of atleast '. However, where wor, is allowed by the!
Eefore ta,ing up any onstru tion, an agreed phased progra44e for the diversion of traffi on the highway shall be drawn up in onsultation with the!
Red lanterns or warning lights of si4ilar type shall be 4ounted on the barri ades at night and ,ept lit throughout fro4 sunset to sunrise. 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. 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. The depth of the pits shall be so regulated that their bottom docs not cut an imaginary line having a slope of 1 vertical to 4 horizontal projected from the edge of the final section of the bank.
The Contractor shall obtain representative samples from each of the identified borrow areas and have these tested at the site laboratory following a testing programme approved by the Engineer.
Should the Contractor be permitted to remove acceptable material from the site to suit his operational procedure. Expansive Clays a Subgrade and mm Not allowed portion just below the subgrade b Remaining portion Not less than 90 of embankment The Contractor shall at least 7 working days before commencement of compaction submit the following to the Engineer for approval: The acceptable materials shall be stockpiled separately.
The Contractor shall ensure that he does not adversely affect the Stability of excavation or fills by the methods of stockpiling materials. Where the excavation reveals a combination of acceptable and unacceptable materials. Subgnde and earthen shoulders Not less than 97 2. No excavated acceptable material other than surplus to requirements of the Contract shall be removed from the site. After the site has been cleared to Clause Due to any negligence on the part of the Contractor.
In case where the difference between the subgrade level top of the subgrade on which pavement rests and ground level is less than 0. Stockpiles shall not be surcharged or otherwise loaded and multiple handling shall be kept to a minimum.
Once the above information has been approved by the Engineer. If the embankment is to be constructed under water. Care shall be taken to discharge the drained water so as not to cause damage to the works. If the foundation of the embankment is in an area with stagnant water. Topsoil shall not be unnecessarily trafficked either before stripping or when in a stockpile. In localities where most of the available embankment materials are not conducive to plant growth. Page 69 of Should circumstances arise.
The embankment and subgrade material shall be spread in layers of uniform thickness not exceeding mm compacted thickness over the entire width of embankment by mechanical means. Page 70 of Any foundation treatment specified for embankments especially high embankments. Successive layers shall not be placed until the layer under construction has been thoroughly compacted to the specified requirements as in Table and got approved by the Engineer.
Where the ground on which an embankment is to be built has any of the material types a to f in Clause After adding the required amount of water.
Moisture content of the material shall be checked at the site of placement prior to commencement of compaction. Where water is required to be added in such constructions. Spreading material in layers and bringing to appropriate moisture content If the material delivered to the roadbed is too wet. Moisture content of each layer of soil shall be checked in accordance with IS: Where so directed by the Engineer. Expansive clays shall however. Each compacted layer shall be finished parallel to the final cross- section of the embankment.
The motor grader blade shall have hydraulic control suitable for initial adjustment and maintain the same so as to achieve the specific slope and grade. The water shall be added uniformly and thoroughly mixed in soil by blading. Only the compaction equipment approved by the Engineer shall be employed to compact the different material types encountered during construction.
Smooth wheeled. Embankment and other areas of fill shall. All permanent faces of side slopes of embankments and other areas of fill formed shall. The procedure to be adopted for these site trials shall first be submitted to the Engineer for approval.
The compaction shall be done with the help of vibratory roller of 80 to kN static weight with plain or pad foot drum or heavy pneumatic tyred roller of adequate capacity capable of achieving required compaction. Each layer of the material shall be thoroughly compacted to the densities specified in Table A record of the same shall be maintained by the Contractor.
Embankments and other areas of unsupported fills shall not be constructed with steeper side slopes. Whenever fill is to be deposited against the face of a natural slope.
Clods or hard lumps of earth shall be broken to have a maximum size of 75 mm when being placed in the embankment and a maximum size of 50 mm when being placed in the subgrade. Page 71 of The Contractor shall demonstrate the efficacy of the equipment he intends to use by carrying out compaction trials. Earthmoving plant shall not be accepted as compaction equipment nor shall the use of a lighter category of plant to provide any preliminary compaction to assist the use of heavier plant be taken into account.
If inspite of that the specified compaction is not achieved. Subsequent layers shall be placed only after the finished layer has been tested according to Clause Damage by construction plant and other vehicular traffic shall be made good by the Contractor with material having the same characteristics and strength as the material had before it was damaged. End dumping of material from trucks for widening operations shall be avoided except in difficult circumstances when the extra width is too narrow to permit the movement of any other types of hauling equipment.
Both the upper and lower ends of the side slopes shall be rounded off to improve appearance and to merge the embankment with the adjacent terrain. The soil in the affected portion shall be removed in such areas as directed by the Engineer before next layer is laid and refilled in layers and compacted using appropriate mechanical means such as small vibratory roller.
The depth of the topsoil shall be sufficient to sustain plant growth. Where the width of the widened portions is insufficient to permit the use of conventional rollers. When earthwork operations have been substantially completed. Construction of Embankment and Subgrade under Special Conditions Earthwork for widening existing road embankment: Page 72 of If the cut is not sufficiently wide for use of required mechanical means for compaction the same shall be widened suitably to permit their use for proper compaction.
The work of repairing the damages including widening of the cut. Slopes shall be roughened and moistened slightly prior 10 the application of the topsoil in order to provide satisfactory bond. Finishing operations: Tests shall be carried out as directed by the Engineer to ascertain the density requirements of the repaired area.
The topsoil. If seeding and mulching of slopes is prescribed. Earthwork for embankment and subgrade to be placed against sloping ground: Earthwork over existing road surface: Where the embankment is to be placed over an existing road surface.
For wet conditions. The material Page 73 of The embankment and subgrade shall be brought up simultaneously in equal layers on each side of the structure to avoid displacement and unequal pressure. The fill material shall not be placed against any abutment or wing wall. The material used for backfill shall not be an organic soil or highly plastic clay having plasticity index and liquid limit more than 20 and 40 respectively when tested according to IS: Where the Contract requires construction of transverse subsurface drain at the cut- fill interface.
Where the provision of any filter medium is specified behind the abutment. Embankment and subgrade around structures: To avoid interference with the construction of abutments.
Unless directed otherwise. The sequence of work in this regard shall be got approved from the Engineer. Filling behind abutments and wing walls for all structures shall conform to the general guidelines given in Appendix 6 of IRC: The fill material shall be deposited in horizontal layers in loose thickness and compacted thoroughly to the requirements of Table The remainder of the embankment shall be constructed as specified in Clause Contractor shall then furnish the soil test data and design of high embankment for approval of the Engineer.
Where this exception is permitted. In case he desires to use different for his own convenience. Where required. Embankment construction underwater: Where filling: This exception to normal procedure will not be permitted where. Construction of embankment over ground incapable of supporting construction equipment: Where embankment is to be constructed across ground which will not support the weight of repeated heavy loads of construction equipment the first layer of the fill may be constructed by placing successive loads of material in a uniformly distributed layer of a minimum thickness required to support the construction equipment as permitted by the Engineer.
Care shall be taken to see that the compaction equipment does not hit or come too close to any structural member so as to cause any damage to them or excessive pressure against the structure. He shall then bring the resultant level up to formation level with acceptable material. Earthwork for high embankment: In the case of high embankments.
Acceptable granular material shall consist of graded. The material placed in open water shall be deposited by end tipping without compaction. Where it may be impracticable to use conventional rollers. The material should be non-plastic having uniformity coefficient of not less than Settlement period: Where settlement period is specified in the Contract. The cost of providing suitable traffic conditions for construction equipment over any area of the Contract will be the responsibility of the Contractor and no extra payment will be made to him.
The Contractor. Subgrade shall be compacted and finished to the design strength consistent with other physical requirements. It shall be ensured prior to actual execution that the borrow area material to be used in the subgrade satisfies the requirements of design CBR. Construction of high embankment with specified material and in specified manner shall be measured in cu.
Subgrade Strength The duration of the required settlement period at each location shall be as provided for in the Contract or as directed by the Engineer. Construction of embankment under water shall be measured in cu.
Page 75 of The measurement of fill material from borrow areas shall be the difference between the net quantities of compacted fill and the net of suitable material brought from roadway and drainage excavation.
Stripping including storing and reapplication of topsoil shall be measure cu. Control on the quality of materials and works shall be exercised in accordance with Clause Any damage arising out of such use shall. Surface Finish and Quality Control of Work The surface finish of construction of subgrade shall conform to the requirements of Clause The actual laboratory CBR values of constructed subgrade shall be determined on undisturbed samples cut out from the compacted subgrade in CBR mould fitted with cutting shoe or on remoulded samples.
For this purpose. Filter medium and backfill material behind abutments. The Contract unit rates for the items of embankment and construction shall be payment in full for carrying out the operations including full compensation for: In case the Contract unit rate specified is not inclusive of all leads. Page 76 of Dismantling and removal of existing cement concrete pavement shall be measured vide Clause Description This work shall consist of measures as shown on plans or as directed by the Engineer to control soil erosion.
Page 77 of Construction Operations Prior to the start of the relevant construction. The Contract unit rate for providing and laying filter material behind abutments shall be payment in full for carrying out the required operations including all materials. Materials All materials shall meet commercial grade standards and shall be approved by the Engineer before being used in the work.
This will also comprise of handling. It shall include cost of instrumentation. Under no conditions shall a large surface area of credible earth material be exposed at one time by clearing and grubbing or excavation without prior approval of the Engineer.