Water Resources Department Tender

Supplying and laying drainage composite for use behind walls, between two different fills etc. having three dimensional composite with thermobonding a draining core having “N/W” configuration in extruded monofilaments of minimum thickness 8mm, with two filtering UV stabilized polypropylene nonwoven geotextile of minimum thickness of 0.75mm characteristic opening size (O90) of 150 micron and tensile strength of 8.0 kN/m that will be working as separation or protecting layer, Geocomposite having in plane flow capacity of 2.1 L / (m.s) at hydraulic gradient of 1.0 & 20 kPa pressure and tensile strength of 28 kN/m, with mass per unit area of 1400 gsm, having minimum creep reduction factor of 1.15 for 100 years life at 100 kPa, at easily accessible location including top and bottom, with all leads and lifts, manpower and machinery, materials, labour etc. complete as per detailed technical specifications and as directed by Engineer - In - Charge.

Providing and laying of BBA certified high strength flexible geo-grid as primary reinforcement at site store maintained by contractor with a high quality coating like LDPE or equivalent. Latex or Polymer coating or geo-textile or any other coating shall not be permitted. Selection of geo-grid be strictly based on secant modulus values for a design life of 120 years at 20°C. GEOGRID shall have High Strength Flexible Uniaxial with low creep characteristics consisting of polyester (PET) & having an outer protective coating of low density polyethylene sheath. It shall have Ultimate tensile strength as mentioned below against each sub item for reinforcement in Flexible Retaining Wall etc. complete as per detailed technical specifications attached and as directed by Engineer-in –charge.

Secant modulus- 2120KN/m

Supply and installation of 0.17m thick Gabion mattress made of mechanically woven, double twisted, hexagonal shaped steel wire mesh, Mesh type 6X8 as per IS 16014:2018, Mesh wire dia 2.2 / 3.2 mm (ID/OD), with double partition with prefabricated X - Ties, Zinc+ High abrasion resistance polymer class A coated, Dark Brown rust not more than 5 % after subjecting to 6000 hours of neutral salt spray as per ISO 9227 and polymer should be resistant to abrasion after 300 cycles and shall not expose metal wire in accordance with the procedure described in ASTM A 975, Mechanically edged/selvedged, with partition at 1 m interval, tying with lacing wire of diameter 2.2/3.2 mm (ID/OD), placing at indicated places in dry condition at easily accessible location as per direction of Engineer including tools, plant, labour etc. complete in all respect (inclusive of supply and filling of stones), carrying the material from nearest approach with all leads & lifts, manpower & machinery, materials, labour etc. complete as per detailed technical specifications and as directed by Officer Commanding. The abrasion resistance test shall confirm to ASTM A 975. Minimum Tensile strength 37 Kn/m & punch strength 21 Kn as per IRC 116, IS 16014 & Morth specification for road & bridge works, Section 2500.

Supply and installation of polyester needle punched non woven geotextile as filter media below gabion mattress, as per MoRTH 700 Type-I geotextile. The width of geotextile roll shall not be less than 4.5 m, at easily accessible location including top and bottom, with all leads and lifts, manpower and machinery, materials, labour etc. complete and as directed by Engineer - in - Charge.

Supply and providing of boulders of 150 mm to 250 mm size to be filleded inside the gabion facia units and gabion matresses as directed by engineer in charge.

Providing & Backfilling behind Gabion facia units with integrated tail with approved selected reinforced granular fill material to be obtained from private query or land as available within lead of 1-2 km including all leads and lifts, including segregation, complete as per drawing and technical specification (Reference to MoRT&H's specification Clause 3100 and IRC:78 clause 710.1.4) & 2200. (reinforced fill)

Excavation for reinforced soil wall, and removal of deposited debris in soil including all material, machinery, labour etc. complete at easily accessible location including top and bottom, as per detailed technical specifications and as directed by Engineer-In-Charge.

Providing and installing subsurface drainage pipes behind the reinforced soil structure with perforated PVC pipe (lined with Non -woven Geotextile) of 160 mm internal diameter as per the drawings etc. complete and as directed by Engineer -in -Charge.