CONSTRUCTION OF A DIAPHRAGM WALL ALONG THE PERIPHERAL WALL OF THE SCALE PIT AND FLUME TUNNEL IN CONNECTION WITH UPGRADATION OF BILLET CASTERS I and II AT CCP MAIN PACKAGE (PKG-I) AT DURGAPUR STEEL PLANT OF M/S SAIL

Mobilization, transportation, erection, commissioning and demobilization of all plants, equipment and resources required for construction of diaphragm wall, complete as per SAIL or DSP tender specifications and directions of Engineer in Charge. The work shall be executed inside a running shop or CCP without shutdown and under all operational constraints. The scope fully includes mobilization and deployment of all construction equipment necessary for diaphragm wall works, including hydraulic grab or trench cutter, crawler crane, service crane, slurry mixing, storage and circulation plant, desanding and recycling unit, slurry tanks, bentonite silos, pumps, tremie pipes, concrete placing accessories, generators, welding sets, air compressors, lighting arrangements, survey instruments, safety equipment, tools, tackles and all other ancillary equipment required for complete execution. The item includes transportation of all plants and equipment to site, unloading, assembly, erection, calibration, trial runs and commissioning to achieve full operational readiness. It includes shifting and relocation of plants and equipment within the site or plant premises as required during execution and complete demobilization after completion of works. The scope also includes deployment of operators, drivers, mechanics, helpers and supervisory staff, supply of fuel, lubricants, consumables, spares, routine servicing, breakdown maintenance and standby arrangements. It includes obtaining and maintaining all statutory approvals, permits, insurance and compliance with plant safety rules. The item includes providing temporary sheds, storage areas, access preparation, internal roads if required, power and water arrangements, lighting, barricading and establishment of quality control and testing facilities for slurry and concrete. The rate includes all labour, supervision, accommodation, handling, rehandling, transportation, all leads and lifts, taxes, duties, insurance, overheads and all incidental expenses required to make the complete diaphragm wall system fully ready for execution under running plant conditions. No separate payment shall be made for multiple mobilisations, extended standby, equipment idle time, restricted access, interruptions, night working, shift wise working or any delay arising from execution inside operating plant premises. Payment under this item shall be made only after commencement of diaphragm wall works and after complete mobilization, assembly, erection and commissioning of all plants, equipment, accessories and ancillary systems required to execute the work in all respects. Mere receipt of equipment at site, partial mobilization or equipment kept in standby condition shall not be eligible for any payment. No payment shall be admissible for idle, standby or non operational equipment under any circumstances.The rate shall be final and binding. No extra claim, compensation or extension of time shall be admissible on any account whatsoever.

Providing and constructing RCC guide walls for diaphragm wall works, complete as per approved drawings, specifications, method statement and directions of Engineer in Charge. The work shall be executed inside a running shop or CCP without shutdown and under all operational constraints. The scope includes survey, setting out of diaphragm wall alignment and marking of panel layout. It includes excavation of guide wall trench in ordinary soil, removal of vegetation and debris, dressing of sides and bottom, shoring or strutting wherever required, dewatering, and stacking or disposal of excavated material within a lead of 100 m. Disposal of surplus excavated material within plant premises up to a lead of 5 km is fully included. The item includes providing and laying PCC levelling course or lean concrete wherever required. It includes providing, fixing, aligning and removing centering, shuttering or formwork with all strutting, bracing and supports. It includes providing and laying RCC guide walls of required dimensions suitable for diaphragm wall thickness, including supply of all materials, batching, mixing, placing, compaction by vibration, finishing, curing and protection. Making of pockets, openings, chamfers, rebates and provision of embedded sleeves or inserts as shown in drawings or required for execution is included. Removal of formwork after the specified period without damaging concrete is included. The scope includes deployment and operation of all required plants and machinery, tools and tackles, handling and shifting within site, quality control, measurements and records for line, level, alignment, thickness, concreting and curing. It includes safety arrangements, barricading, lighting, housekeeping and compliance with plant safety rules and permit systems while working inside running plant premises. The rate includes all labour, supervision, materials, PCC and RCC, shuttering and formwork, plants and machinery, tools and tackles, handling, rehandling, transportation, all leads and lifts, taxes, duties and all incidental expenses required for completion of guide wall works in all respects. No separate payment shall be made for variation in soil condition, depth of excavation, dewatering effort, working height, access restriction, interruptions, idle time, night work or execution inside running plant premises. The rate shall be final and binding. No extra claim, compensation or extension of time shall be admissible on any account whatsoever.

Providing and laying cast in situ reinforced cement concrete of specified grade for diaphragm wall guide walls, complete as per approved drawings, specifications and directions of Engineer in Charge. The work shall be executed inside a running shop or CCP without shutdown and under all operational constraints. The scope fully includes supply of all materials by the contractor including cement, fine aggregate, coarse aggregate of 20 mm and down graded size, water and approved admixtures where required. It includes batching and mixing in approved mixer or batching plant, transportation to site, placing, laying and compaction by mechanical vibration, finishing of exposed surfaces, formation of construction joints where required, curing for the specified period and protection of green concrete. The item includes providing pockets, openings, recesses, chamfers, rebates and embedded sleeves or inserts, dowels, starter bars and fixtures as shown in drawings or required for execution. It includes maintaining required line, level, alignment, dimensions and tolerances and making good of edges, corners and surfaces to the satisfaction of Engineer in Charge. The rate includes all labour, supervision, tools and tackles, plants and machinery, scaffolding or working platforms, consumables, sampling, testing and quality control, handling, rehandling, transportation, shifting within site, all leads and lifts and all incidental expenses required for completion of the work in all conditions including restricted access and live plant operation. Reinforcement steel and centering or shuttering shall be measured and paid separately under relevant BOQ items unless specifically stated otherwise. No separate payment shall be made for variation in pour size, location, working hours, interruptions, idle time or execution inside running plant premises. The rate shall be final and binding. No extra claim, compensation or extension of time shall be admissible on any account whatsoever.

Grade of Concrete M 25

Grade of Concrete M 30

Grade of Concrete M 35

Grade of Concrete M 40

Supplying, fabricating and placing in position high yield strength deformed steel reinforcement bars of grade Fe500D or Fe550 as specified, conforming to relevant IS standards, for RCC guide wall works, complete as per approved drawings, bar bending schedule and directions of Engineer in Charge. The work shall be executed inside a running shop or CCP without shutdown and under all operational constraints. The scope fully includes supply of reinforcement steel by the contractor, transportation to site or fabrication yard, unloading, stacking, straightening, cleaning and de coiling where required. It includes cutting, bending and shaping to required lengths, hooks, cranks and bends, and providing laps, anchorage and development length strictly as per drawings and specifications. Welding shall be carried out wherever specified, including supply of welding sets, electrodes, power and consumables. The item includes placing reinforcement in position with specified cover using approved cover blocks, chairs, spacers, separators and supports. It includes tying at all intersections with binding wire to maintain correct spacing, alignment, line and level during concreting. It includes fabrication and fixing of reinforcement for corners, junctions, openings, pockets, dowels, starter bars and embedded items, including all necessary tying or welding. The scope includes maintaining reinforcement position during concreting and making all adjustments or corrections required to achieve specified tolerances. Any deformation, displacement or damage shall be rectified at contractor’s cost. The rate includes all labour, supervision, tools and tackles, cutting and bending charges, welding sets and consumables, binding wire, cover blocks, chairs, spacers, handling, rehandling, transportation, shifting within site, all leads and lifts, compliance with plant safety rules, permit systems, restricted access conditions and all incidental expenses required for completion of the work in all conditions. No separate payment shall be made for variation in bar diameter, quantity, congestion, working height, access difficulty, interruptions, idle time, night work or execution inside running plant premises. The rate shall be final and binding. No extra claim, compensation or extension of time shall be admissible on any account whatsoever.