KERALA WATER AUTHORITY
AMRUT - PHASE III - Package - I Strengthening of Existing Infrastructure Facilities and Quality Improvement of CWSS in Kozhikode Corporation
Re - e - TENDER No : SE/PHC/KKD/ 09 /201 8 – 1 9 DUE DATE: - 2 1 /0 7 / 201 8
NOTICE INVITING TENDER
VOLUME – 2
SCOPE OF WORKS
OFFICE OF THE SUPERINTENDING ENGINEER P . H . CIRCLE, KOZHIKODE KERALA WATER AUTHORITY MALAPARAMBA, KOZHIKODE - 9 TELE: 0495 – 2371046 Fax : 0 495 – 2371046 KERALA WATER AUTHORITY
CONTENTS
Chapter Description Page No.
Volume 2
1. General information 3 2. Descri ption of route 4 3. Scope of the tender 4 4. Details of works . 5
4 .1 Gen e ral Information 6 4 .2 Description of route 6 4 . 3 Supply of Pipes, Specials 7 4.4 Supply of Sluice Valves 8 4.5 Supply of Air Valves 9 4.6 Supply of Specials 9 4.7 Laying and Commissioning of Pipe Line 1 1 4.7 .1 Trenching 1 1 4.7.2 Culverts and bridge crossing 12 4.7.3 BT/WBM/Berm cutting 12 4.7.4 Fencing 13 4.7.5 Shoring 13 4.7.6 Filling quarry muck 13 4.7.7 S urplus earth 1 3 4.7.8 Bailing out 1 3 4.7.9 Laying of Pipes 1 3 4.7.10 Supports to Pipeline 14 4.7.11 Jointing 1 4 4.7.12 RCC pipe supporting structure/pipeline bridge 1 4 4.7.13 Anchorage 15 4.7.14 Road crossing by push through method 15
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4.8 Valve Chambers 15 4.9 Connection Chambers 1 5 4.10 Providing Fire hydrants 16 4.1 1 Reinstating house connections 16 4.1 2 Testing of pipe lines 16 4.1 3 As laid map 16
5. C larification. 17
6. S afety at site 1 7
7. U nforeseen items 1 7
8. P roject schedule 1 7
9. Drawings 18
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KERALA WATER AUTHORITY
VOLUME – II
SCOPE OF WORKS AMRUT - PHASE III - Package - I Strengthening of Existing Infrastructure Facilities and Quality Improvement of CWSS in Kozhikode Corporation
SCOPE OF WORK : - . Supplying, Laying, T esting and commissioning of 200mm DI K9 distribution main, 500mm MS pipe,750mm MS pipe, construction of valve chambers, inter linking with existing lines, reinstating house connections, providing fire hydrants in distribution lines, Road crossing by push through method, Design construction and commissioning of RCC bridge across river at
Theng ilakkadavu.
1.0 GENERAL INFORMATION
1.1 Th e work named Supplying, Laying, Testing and commissioning of 200mm DI K9 distribution main, 500mm MS pipe,750mm MS pipe, construction of valve chambers, inter linking with existing lines, reinstating house connections, providing fire hydrants in distribution lines, Road crossing by push through method, Design construction and commissioning of RCC bridge across river contain s .
1 ) Supplying Laying T esting and Commissioning of 200mm DI K9 distribution main from Kalluthan kadavu to Mankavu along RHS of Eranjipalam Meenchanda Mini bypass and along both sides of Mavoor road from Mavoor road junction to Arayidathupalam
2 ) Supplying Laying T esting and Commissioning of 500 mm and 750mm MS pipe over RCC bridge at Thengilakadavu and interconnection with existing CI/DI gravity main.
3 ) Design construction and commissioning of RCC bridge for laying pipeline across Thengilakadavu river 4) Construction of Valve chambers
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5 ) Shifting House connections at Mavoor Road and at Mini bypass
6 ) Inter connection of pipe lines with existing lines
7 ) Providing Fire Hydrants in distribution line along Mavoor road
8) Road crossi ng by push through method at three places
1.2 The project named Supplying , Laying, T esting and commissioning of 200mm DI K9 distribution main, 500mm MS pipe, 750mm MS pipe, construction of valve chambers, inter linking with existing lines, reinstating house connections, providing fire hydrants in distribution lines, Road crossing by push through method, Design construction and commissioning of RCC bridge across river to p rovide potable water to the inhabitants in Kozhikode Corporation. Scheme area comes unde r Kozhikode Corporation , in Kozhikode taluk in Kozhikode District. The topography of the scheme area is undulating with respect to mean sea level in between +54.000 to +2.000.
1.3 The nearest railway station is Kozhikode at a distance of 8 km, the nearest sea port is Beypore at about 1 0 Km and the nearest air port is Karippur (Kozhikode) at about 2 0 Km from the site.
2. DESCRI PTION OF ROUTE All the proposed pipe lines are to be laid along Mini bypass from Kalluthankadavu to Mankavu and along Mavoor road from Aryidathupalam to Mavoor junction in Kozhikode Corporation and at Thengilakadavu in Mavoor panchayath. Pipe lines are to be laid along PWD and corporation roads.
3 . SCOPE OF THE TENDER
● The contract firm is bound to lay pipes over culverts and bridges crossings adopting standard procedure using suitable sized pipes as insisted by the authority rigidly supporting at needed locations. ● All such specials needed for the satisfactory co mpletion of the works and for future maintenance need to be supplied by the firm and necessary safety fittings such as air/scour/sluice/reflux valves etc are also need to be fitted at appropriate locations as identified by the Engineer in charge of the sit e.
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● The contractor is also bound to maintain the entire facilities intact for one year from the date of commissioning. ● The firm should maintain the scheme intact and all the repair works arises during this maintenance period need to be attended in time on intimation from the competent authority. ● The contract firm is bound to maintain the as laid details of the pipes laid and should submit sufficient copies, on completion of the work, clearly earmarking important junctions/institutions etc. ● The scope of this tender covers Procurement of the listed quantity of pipes (Ref - table) laying, testing etc.
The scope of this tender covers the following works 1 ) Supplying Laying T esting and Commissioning of 200mm DI K9 distribution main from Kalluthan kadavu to Mankavu along RHS of Eranjipalam Meenchanda Mini bypass – 3 304 m and along both sides of Mavoor road from Mavoor road junction to Arayidathupalam - 2 8 24 m 2 ) Supplying Laying T esting and Commissioning of 500mm MS pipe - 150m excluding length of specials and 750mm MS pipe - 150m excluding length of specials along proposed RCC Bridge at T hengilakadavu (90 m over the bridge and 15 m at slopped portion and balance length of 45m for interconnection of the line with existing CI/DI pipe line. 3) Supplying Laying T esting and Commissioning of 300 mm MS pipe - 70 m for casing pipe at push through portion (2 places along Mini bypass and 1 place along Mavoor road) . 4 ) Design construction and commissioning of RCC bridge for laying pipeline across Thengilakadavu river 5 ) Construction of Valve chambers - 13 Nos 6 ) Reinstating House connections - 300 Nos 7 ) Inter connection with existing lines – 40 Nos (with existing CI/PVC pipe lines) along Mini bypass from Kalluthan kadavu to Mankavu and along Mavoor road from Mavoor road junction to Arayidathupalam. 8 ) Providing Fire Hydrants – Supplying and fixing fire hydrants 6 Nos along Mavoor road confirming to relevant IS Specification 9 ) Road crossing by push through method at three places (2 places along Mini bypass and 1 place along Mavoor road ) . Total length – 70M
4 DETAILS OF WORK : Supplying, Laying, Testing and commissioning of 200mm DI K9 distribution main, along RHS of Kalluthankadavu to Mankavu and both sides of Mavoor road in between Arayidathupalam to Mavoor road junction, 500mm MS pipe and 750mm MS pipe at river crossing at Thengilakadavu , construction NIT Volume II - Page | 5 of valve chambers, inter linking with existing lines, Shif ting house connections, providing fire hydrants in distribution lines along Mavoor road , Road crossing by push through method, Design construction and commissioning of RCC bridge across river at The ngilakadavu .
4 .1 GENERAL INFORMATION OF WORK : -
Pipes supplied shall be conforming to relevant IS Specification, the pipeline shall be laid along the predetermined routes, shall be tested for the maximum test pressure for the class of pipe specified in t he relevant IS codes. The entire road/culvert crossing necessitated to complete the pipe laying works should also be carried out without affecting the alignment and gradient of the pipe line. Identification board should be provided over the road side through the alignment of pipe line (2 Nos./Kms) as per direction of Departmental Officers. The alignment of pipe line should not be adjusted to affect any bend and required bend should be provided with necessa ry RCC anchor blocks/supports. The c ontractor has to provide necessary support for the pipe line laid exposed if any.
4 .2 DESCRIPTION OF ROUTE : - The route is through PWD , Corporation road in Kozhikode corporation and in Mavoor panchayath . There are culverts along the route of the pipe line. The pipe line can be laid under the ° culverts using nonstandard bends, lesser than 45 (MS) in order to minimize water thrust in bends.
° Care should be taken to avoid 90 bend in all such culvert and Road crossings The pi pelines to be laid along the extreme edge of the road (Earth berm portion of PWD/Corporation roads) and at all cases effort shall be taken to minimize cutting of BM/BC (BT) portion of the road. Damages should not be made to any private/public property duri ng the execution and if any damages made, the same shall be compensated by the contractor without any liabilities to Kerala Water Authority. The trenching is to be done through PWD/ Corporation roads and the type of soil is mostly all classes of soil, ordinary rock, Medium Rock and Hard rock . The tenderers shall examine the route and alignment of the pipeline and anticipate all incidental works that are not explicitly stated in this document.
Damages should not be made to any private/public property du ring the execution and if any damages made, the same shall be rectified/compensated by the contractor without any liability to the Kerala Water Authority. There are optical fiber, telephone cables and water pipelines of the existing mini water supply sche mes, present at many places along the proposed alignment of the road and hence a preplan of NIT Volume II - Page | 6 work execution to be made before commencing the work. To avoid miscommunication among various departments and owners of such utilities with the KWA, the contracto r shall do the liaison works as and when required .
4 . 3 SUPPLY OF PIPES AND SPECIALS : -
The tender i nvolves supply of DI, PVC , MDPE and MS pipes of various sizes and to the required class confirming to relevant IS codes. The details such as length and class of pipes proposed under this tender are mentioned in the table below . All the pipes and specials (except MS pipe and specials) thus supplied should be marked with BIS marking and color codes according to the class, type and size while receiving at si te. All such specials needed for the satisfactory completion of the work such as collars, bends, tappers, tail pieces, Tees, adaptors, etc shall be provided by the tenderer after inspecting the site, well in advance , in consultation with the Engineer in ch arge of the work and to ensure all such special bears proper BIS marking and other details as stipulated by rules and regulations in force. The Executive Engineer or an Engineer deputed by him has the power to accept or reject the specials if it found subs tandard without further communication to the contractor/firm. Prior sanction must be attained before fixing any non - standard specials, in the line, under unavoidable circumstances. Prior approval shall be sort from the Executive Engineer for the place whe re the pipes and specials are stacking and the contract firm is liable to ensure adequate security for that site to avoid theft of pipes and specials even though the pipes and specials are being accounted by the authority. It is the sole responsibility of the contract firm to maintain and secure all the pipes and specials receipted at site till the completion of the work regardless of the matter that the part payment for the same is released from the authority. The contract firm is liable to submit a copy of the supply orders/invoices or LRs in respect of the pipes and specials as requested by the authority in due course of time without failure. The contract firm is liable and responsible to supply pipes as per the table below , irrespective of the fact that whether it’s meant for laying, future maintenance or for culvert crossing . The balance pipes after the completion of the work will be taken by the Kerala Water Authority subjected to conditions specified in the forthcoming paragraphs. The contra ctor shall supply and lay pipes as below . It includes necessary specials as per the site requirement. The contractor shall also supply sufficient number of bends, Tees and other specials required for the satisfactory completion of work. All the pipes supplied s hall conform to relevant specification of BIS or ISO and shall bear ISI or ISO marking. All necessary specials such as bends, Tees etc. for laying pipes, fixing air valves, control valves, scour Tees for fixing sluice valve for scour
NIT Volume II - Page | 7 delivery pipes etc. sh all also conform to BIS/ISO standards. Non standard specials required for the work shall be fabricated at site using MS pla tes of thickness not less than 10 mm with necessary weather proof anti - corrosive coating. Flange pipe shall be procured only on conf irmation from the engineer – in - charge of site. The length and configuration of pipes will be decided as per requirement at site.
Sl.No. Description of Pipes Quantity
1 200mm DI K9 pipe 6 128 m
500 mm MS pipe with 10mm thick plate 2 150 m without length of specials
750 mm MS pipe with 10mm thick plate 3 150 m without length of specials
4 300 mm MS pipe with 8mm thick plate 70 m
5 110mm PVC pipe 6Kg/cm 2 30m
6 90mm PVC pipe 6Kg/cm 2 30m
7 75mm PVC pipe 6Kg/cm 2 30m
8 63mm PVC pipe 6Kg/cm 2 30m
9 20mm MDPE pipe 1500m
Total Length of Pipeline 8118 m
4.4 SUPPLY OF SLUICE VALVES : - Control valves of same pipe dia are to be supplied and shall be fixed in the line. Sluice valves (PN 1. 6 ) of reput ed make are to be supplied. The valves should be supplied with hand wheels or otherwise as specified. The contractor shall supply CI D/F (PN 1. 6 ) sluice valves of reputed make and quality for providing scour arrangements. The scour valve is to be provided with scour Tees and scour deli very at every valley or nearest culvert or at places where the water can be drained conveniently as per the directions of departmental officers. All the valves shall conform to relevant BIS/ISO standards and also bear ISI/ISO marking wherever applicable. The total number of valves shall be not less tha n
NIT Volume II - Page | 8 the number given in the table. Valves shall be installed with valve chambers, Valve chambers shall be constructed as per relevant clause in this document and NIT Vol - I.
Sl.No Description of Valves Q TY Remar ks
1 7 50mm CI D/F Sluice val ve PN 1.6 1 No
2 500mm CI D/F Sluice val ve PN 1.6 1No
3 200mm CI D/F Sluice/Scour val ve PN 1.6 6Nos
4 50mm GM valve with wheel 2Nos
5 80mm GM valve with wheel 2 Nos
4.5 SUPPLY OF AIR VALVES: - The Contractor shall supply Kinetic Single /Double orifice air valve s as follows, conforming to relevant BIS/ISO standards should be provided with control valves in all crust points along the alignment as per direction of departmental Officers at site. The air valves shall be fitted in the line with suitable CI Tee / MS clamp and should be provided with 80mm/ 50 mm control Valves at all crest point without hindering the utility of the road, as per the direction of the officers of the Kerala Water Authorit y. Valves shall be installed with valve chambers, Valve chambers shall be constructed as per relevant clause in this document and NIT Vol - I. The total number of valves shall be not less tha n the number given in the table.
Sl.No Description of Valves QTY Remarks
1 CI Kinetic air valve DK 50mm 3 No
2 CI Kinetic valve DS1 8 0mm 2 No
3 CI Air valve DS2 100mm 2No
3 CI Air valve DS 2 150mm 2 Nos
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4.6 SUPPLY OF SPECIALS : - The necessary specials such as bends, collars, Reducers, Tees, Air Tees for fixing air valves, scour Tee for scour arrangement, Flanged tail pieces for fixing valves, pipes for scour delivery arrangement etc. should be conforming to BIS/ISO standards and are to be supplied and the installed by the tenderer for satisfactor y completion of the work. In case of non standard specials, fabricated specials shall be used with the permission of the Engineer in charge. Tenderers are advised to make their own assessment of the quantity of such special required for the work. If standa rd specials are not available for a particular configuration, fabrication with MS plates will be allowed. In all such cases the thickness of th e plate shall not be less than 10 mm and the welding procedure shall be got approved by the Engineer - in - charge be fore the commencement of fabrication. The details of DI specials required for each part are as listed below:
Sl.No Description of specials QTY Remarks
1 200mm DI S/S bend 90 0 6 No s
2 200mm DI S/S bend 45 0 10 No s
3 200mm DI S/S bend 22.5 0 14 No s
4 200mm DI S/S bend 11.25 0 18Nos
5 200mm DI D/F bend 90 0 4Nos
6 200mm DI D/F bend 45 0 2Nos
7 200mm DI D/F bend 22.5 0 2Nos
8 200mm DI D/F bend 11.25 0 2Nos
9 200mm Collar 24 Nos
10 200mm DI Flanged tail piece 16Nos
11 200 x 200 x 80 mm DI Flanged Air Tee 5Nos
12 200 x 200 x 200 mm DI Flanged Equal Tee 5Nos
13 200 x 200 x 200 mm DI S/S Equal Tee 11Nos
14 300 x 300 x 200 mm DI S/S Equal Tee 2Nos
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4.7 LAYING AND COMMISSIONING OF PIPE LINE 4.7 .1 TRENCHING Minimum Average width & depth of trenches are as follows: Minimum depth of SL No Diameter of Pipe Average width of trench trench 1 200 mm DI Pipe 0.8 0m 1.1 5 m Trenching is to be done in all classes of soil including rock, if necessitated and the trench must be of adequate width and the depth shall v a ry to maintain line and level subject to minimum cover of 90 cm over the crown of pipe according to site condition. Any usable materials retrieved during excavation have to be stored / stacked separately and will be the asset of the Kerala Water Authority. Blasting in rocky strata should not be carried out without prior sanction from the competent authority, that too with all preventive measures as mentioned in the technical general specification in NIT vol I. Chiseling in hard rock ( where blasting is prohibited) shall be carried out wherever necessary according to site condition as per relevant standard specification. Socket pits shall be taken before laying pipes in trenches to allow the body of pipes to rest directly on the bed.
Refilling with excavated soil has to be done after laying, jointing and satisfactory testing of pipe line, in layers, watered, consolidated with mechanical vibrators and there shall not be any sinking of refilled portion when the work is over. The trenches through rock strata must have minimum 10 cm extra depth to provide selected soil or M sand cushion for pipe line and back filling up to 30 cm above pipe crown must be done only with selected soil or M - sand so as to avoid any damages to the pipe from hard rock materials as per the direction of Kerala Water Authority. In case the Engineer in charge decides that the depth of trenching can be reduced at any of the reaches along the alignment due to specific site conditions, a proportionate deduction for the s avings in earth work shall be effected at department rate (2016) from the contractor’s bill raised on lump sum basis.
Wherever existing all kind of masonry works/ concrete works are to be dismantled, care shall be taken in chipping and removing the port ions without damaging the remaining structure and the debris shall be disposed off as directed by the officer in charge of the work. The damages of such masonry or concrete work shall have to be made good by the tenderer without any extra claim as per the directions of departmental officers.
Dismantling old asphalt /Bituminous flooring shall be done to the minimum extent and use of an asphalt cutter is advised for the purpose. Contractor will be held responsible for any excessive cutting of asphalt floori ng than required for satisfactory completion of work. NIT Volume II - Page | 11
Electric/Telephone posts and UG cables which are very near to the alignment of the pipeline shall be secured and adequately protected while excavating the trenches. If shifting of an electric post i s unavoidable, it shall be done by the tenderer by seeking permission from the competent authority. Also, the damages made to the telephone cables during the execution of work should be rectified by the tenderer. The contractor shall be liable for any dama ges occurred to such public and private properties during the work.
4.7.2 . Culverts and Bridge crossings
The culverts, irrespective of its span width, coming in the alignment of the pipelines must be crossed using suitable size pipes if the crossing is exposed to atmosphere and metal encasing pipe of sufficient size length to be provided at the crossing area. Effort shall be taken to avoid abrupt bends and diversions in the line while crossing the culvert. In any case, the decision taken by the author ity shall be final in this regard. The additional pipes and specials needed for the work has to be borne by the contract firm. T he firm shall assess the number of culvert crossings himself during site inspection before participating the tender. 4.7.3 . BT/WBM/BERM Cutting. The trenching work includes cu tting/crossing of PWD/Corporation BT/BM&BC roads and berms to maintain correct horizontal and vertical alignment of pipe line. The tenderer is bound to abide by the conditions of the Agreement executed be tween tenderer/KWA, as the case may be, with the PWD/Other agencies, before getting the road crossing/cutting permission. The tenderer must be well acquaint with all the prevailing rules of PWD or concerned regarding the trenching work along PWD roads and should strictly adhere such practices while execution. The contractor shall also be responsible for stripping away all excess earth from the trenched area as identified by the departmental officers to dispose off at convenient nearby site. However the sanc tion for road cutting will be looked after by the Authority, the tenderer must do the liaison work as and when required. Any consequences arising due to ignoring or exercising wrong practices violating the prevailing rules or directions related to tre nching along PWD/NH /Corporation roads shall be vested by the tenderer whether it is financial or legal. The tenderer shall submit an as laying sketch clearly showing the exact chainages of valve chambers or other permanent structures intended to construct as a part of the work along the road, well in advance to the Executive Engineer so as to get approval of the PWD /Corporation authorities. The trenched roads shall be restored to satisfactory condition by way of filling red earth or quarry waste as and when asked by the Engineer in charge of the work. Proper safety measures such as caution boards, taps, fencing, lighting etc. must be done while doing the trenching work. NIT Volume II - Page | 12
4.7.4 Fencing Fencing shall be done along the side of trenches as a protection as per relevant clause in vol. I of NIT and according to the direction of department officers at site. Fencing one side of trenches, 1.50 m height with two raws of 10 cm plastic caution tape in vertical casuarinas pole (girth 15cm to 24cm) fixed at 2 m interv als with minimum of 5352m . and fencing with pole with minimum of 696m. Safety of the public and labours shall be ensured by the Contractor till the completion of the pipe laying work.
4.7.5 Shoring
Shoring the side of the trenches shall be provided wherever the trenching exceeds 1.5 m or trenching is to be done very near to the existing structures as per relevant clause in NIT and as per the directions of the departmental officers in charge of the work. In case the contractor fails to provide the pro tection works as mentioned above, he shall be responsible for any loss or damages caused to public or Private structures and accidents occurred during the execution of work and will be imposed a penalty equivalent to the cost of such works at departmenta l rates.
4.7.6 Filling Quarry muck
After laying pipes along PWD / Corporation road the top layer of trenches should be filled with Quarr y muck in two layers of depth 10 cm each. It should be properly consolidated and compacted each layers by ramming. The supply of quarry muck shall be done as per the directio n of Engineer - in - charge of site with minimum quantity of 931.60m3.
4.7.7 Surplus earth
Surplus earth after the refilling of trench must be removed by the contractor to the suitable place as pe r the direction of departmental officers at his own cost.
4.7.8 Bailing out
Water in the trenches during laying of pipe due to the rain or breakage of existing pipes or in any case must be pumped out by the contractor either using lab our or pump set. 4.7.9 LAYING OF PIPES Pipes shall be laid in straight line in trenches so that the body rests directly on the soil bed. Handling of pipes to lay in trenches or on any support structure must be done carefully and with proper equipments used for the purpose. Any deviation from st raight line shall be done using standard bends. In case standard bends are not available for a particular shape of bend, specials fabricated with MS sheet of thickness not less than 10 mm may be used with prior approval of the Engineer in charge. NIT Volume II - Page | 13
Wherever cutting of pipe is required, it shall be done perpendicular to the axis of the pipe and the cut edges shall be filed and smoothened before jointing. Cutting with chisel and hammer shall not be permitted. Electrically powered cutting wheels shall be used as far as possible. Cutting shall not damage the internal lining of pipe. The interconnection works with the existing Pipe lines should be carried out properly with necessary specials .
The location of the sluice valve, scour valve and air valve will be determined by the dept. officers during the execution time. Construction of reservoirs is not included in the scope of this work.
4.7.10 SUPPORTS TO PIPELINE Where the sub soil of the proposed alignment of pipe line is found po or / water table is above pipeline or if any technically unsound condition occurs, proper bedding with concrete saddle or sleepers or any other method approved by the Engineer in charge should be followed. When pipes are to be laid over supports / pedestal s in low lying areas for culvert crossings or in water - logged areas or for any purpose such as maintaining the line, level and gradient, such support structures shall be constructed in RCC and the typical design shall be got approved by the Engineer in cha rge before the commencement of such construction. In all such cases, pipes should be properly strapped to the support structure using MS clamps /bolts & nuts etc.
4.7.11. JOINTING Any approved type/method of jointing will be permitted subject to the c apability to withstand the maximum test pressure. The method of jointing and the materials for jointing shall be got approved by the Engineer in charge.
4.7.12 . RCC PIPE SUPPORTING STRUCTURE/PIPELINE BRIDGE Pipeline support: - RCC Pipeline Bridge should be provided having a length of 90 m (6 Span x 15.0m) with sloping to both sides for a length of 15 .80 m ( 2 x 7. 9 0 m) and 4.00m wide for laying MS pipeline for crossing the waterway at T hengilakadavu. The minimum clearance between MFL and bottom of col umn cap shall be 6.00 m. (Sketch showing the bridge alignment attached) The design of RCC pipeline bridge/RCC pipeline supporting structure shall be done after conducting trial boring and soil test at site and should be approved by the Department before com mencing the work. The foundation shall be cast in situ RCC piles (grade M.25) and conduct load testing.
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The structure consists RCC M 25 pi l e cap, columns, column cap, supporting girders, main girders , deck slab , support for pipes, pilasters for parapet wall . Dowel bars are to be provided for casting RCC pipe support at an interval of 3.00 m. The whole structure shall be plastered with cement mix 1:3 12mm thick and finished with cement paint. The fabricated MS pip e should be laid on the bridge with minimum centre to centre distance of 1.00m .
4.7.13 ANCHORAGE At all locations of bends, steep gradient, pipes over supports /bridges etc. wherever the pipes have a tendency to pull apart, lift up or move aside, t he pipes and specials must be properly anchored with reinforced concrete thrust blocks of mix M20 or any other structures approved by the Kerala Water Authority. The anchoring must be so designed that there shall be no hindrance to nearby structures and ut ilities or traffic and the joint must be kept exposed for easy maintenance after commissioning. The anchoring work can be carried out only after getting the design appr oved by the Engineer in charge. 4.7.14 ROAD CROSSING BY PUSH THROUGH METHOD Road crossing by push through method at three places (2 places along Mini bypass and 1 place along Mavoor road). Total length – 70M
4.8 VALVE CHAMBERS Valve chambers shall be constructed in RCC (M20) and the inside size shall not be less than 1 .5 0 m X 1 .5 0 m for both Control / scour valves. Wherever there is site restriction, alternate design can be made with prior approval of the Executive Engineer in charge of the work. The Cover slabs, side walls and base slab of valve chambers shall be 20 cm thick and cover slab shall permit IRC class A loading pattern and there shall not be any see page from the bottom or sides.
While casting the concrete for the valve chambers care shall be taken to see that it is not cast directly over the pipe shell. Valve chambers deeper than 120 cm shall be provided with CI foot rests on sides. The locking arrangement has to be provided over the cover slab of the valve chambers. The design of valve chambers shall be submitted to the engineer in charge and got approved befo re commencing the work
4.9. CONNECTION CHAMBERS Connection chambers if any shall be constructed in RCC (M20) and the inside size shall not be less than 1.2 0 m x 0.75 m. Wherever there is site restriction, alternate design can be made with prior approval of the Executive Engineer in charge of the work. The side walls and base slab of
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connection chambers shall be 15 cm thick and cover slab shall be 20cm thick and shall perm it IRC class A loading pattern and there shall not be any seepage from the bottom or sides.
While ca sting the concrete for the connection chambers care shall be taken to see that it is not cast dir ectly over the pipe shell. Connection chambers deeper than 120 cm shall be provided with CI foot rests on sides. The locking arrangement has to be provided o ver the cover slab of the Connection chambers. The design of connection chambers shall be submitted to the engineer in charge and got approved before com mencing the work 4.10 PROVIDING FIRE HYDRANTS Supplying and fixing fire hydrants 6 Nos along Mavoor road confirming to relevant IS Specification at the suitable place as per the direction of departmental officers .
4.1 1 REINSTATING HOUSE CONNECTIONS Domestic and non - domestic connections and public stand posts should be reinstated after laying new pipeline as per the direction of the departmental officers in charge. Sufficient length of MDPE pipes to be used for reinstating connections. All connections to be reinstated with new fittings such as saddle piece, brass ferrule, GI union, brass s top cock, etc. The firm is bound to fix RCC Public stand posts with taps usin g 20mm MDPE pipes using all such standard specials and fittings at locations as identified by the Engineer in charge of the work. The size and type of Hydrants must be got approved by the Executive Engineer or concerned. Stop cock must be fitted in the conne ction line (20 mm MDPE) to the public tap. The tapping from the main headers shall be done using appropriate size saddle.
4.1 2 TESTING OF PIPE LINE The pipes and specials laid have to be tested to the required test pressure in the field in 15 0 m stretches as per BIS laid out for testing of pipelines. The contractor will not be allowed to proceed with the work leaving more than 200 m of pipe line untested. The joints of all the pipes and specials shall be kept open until the testing is done sat isfactorily. Water and the equipments required for the testing shall be arranged by the contractor at his own expenses.
4.1 3 AS LAID MAP The Contr actor shall submit 5 copies of the as laid map of the entire facility he has installed for the project a s a part of the contract with necessary reference to the existing permanent structures. Submission of the as laid map is mandatory for considering the work as completed. The aslaid map shall be prepared in scale 1:2000 and shall be submitted to Engineer in charge. The as laid map shall indicate locations of all valve chambers etc. with typical cross sections of valve chambers, NIT Volume II - Page | 16 specifications and particulars of valves and specials and all such details regarding the completed work. On approval of the as laid map, 5 copies of the same neatly bounded shall be submitted to the engineer in charge together with 2 Nos. soft copies in CD - ROM. 5 . CLARIFICATION. In case of any contradiction is noticed in this NIT , t he same can be clarified from the Exe cutive Engineer in charge of the work during execution and will stand final in every aspect, however the tenderer is at wisdom to get all his clarifications / doubts cleared about the scope of work should be done at the time of pre - bid meeting and further doubts will not be entertained. 6. SAFETY AT SITE
Contractors alone shall be responsible for any damage to men and materials that may occur at site due to lapses in safety measures. Contractors shall provide necessary caution boards and fencing as per the direction/specification of KWA for the trenches during the progress of work. Minimum 3 nos caution boards shall be placed in the approaching side and 2 nos at the leaving side at the required distances as per the relevant safety codes. They shall also prov ide sufficient shoring to the sides of trench to prevent collapse of trenches and consequent damages to man and materials whenever the depth of trench exceeds 1.50 m or while excavating near other civil structures. During night hours contractors shall prov ide sufficient lighting and watching at site. Failure to adhere to these directions shall attract fines and penalties by way of deduction from payments to the contractors at an amount worked out at department rates.
7 UNFORESEEN ITEMS Any items missin g in the scope of work which is essential for the satisfactory completion of this work will be considered as part of the scope of the work of this contract.
8 PROJECT SCHEDULE T he contractor shall prepare a bar chart for implementation of the work and submit along with the tender.
Name and signature of Tenderer Superintending Engineer
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