Supply and Construction of RTW River Training Works

Supply and fixing including labour stone boulder fill in the Gabin boxes, stone for the gabin facia shall hard angularto round, durable and of such quality that they shall not disintegrate on explosure to water or weathering during the life of the structure. The min and max size of the stone use for filling should be 1.5to 2.5 times the mesh opening. Size variation may be allow 5% over the undersize rock, The rock pieces should be properly hand packed min density of stone is 22 KN/m3 and los angeles abrassion value not more then 45.

Coarse Sand free from vegetation

Cement 43 Grade OPC packed in HDPE bag each 50 kg wt Conform to IS 8112-1989 (Make: Birla Gold/Ambuja/ Ultratech/ACC/JK/Dalmia or equivalent).

Coarse Aggregate 20 mm graded

Stone for RR messonery less then 6"

Water proofing compound conform to IS 2645-2003 (Make : Pidilite/ Dr Fixit/ Fevicol or equivalent)

Quick setting Compound (Make : Pidilite, Fevicol, Quick Fix or equivalent)

Supply and fixing include labour the Gabin boxes shall have haxagonal woven mesh with a maxiumum size of 75x75x4mm dia , with the joints funned by twisting each pair of wires through three half turns. The diameter of the wire used in the fabrication of the mesh shall be 4.0mm . Sufficient binding and tie wires, horizontal and vertical bracers, and other acessories needed for the assembly an direction of the gabion works shall be supplied. The quantity of such wire shall be not less than 10% by weight of the gabions supplied under the contract. The diameter of the binding and connection wires shall be 2.4mm. The dimension of the gabion shall be 1M x 1M x 1M. Weight of one gabin boxes is not less than 17.00 kg. These boxes are joined using stainless steel fasteners or lacing wires or galvanized rings all these materials shuld be tested and confirmed to the spec as per IS 4826,12753 & IS 4454 (iv). Hexagonal woven mesh have a tensile strength Min 350 N/MM2- 550 N/mm2 in accordance with IS 280. Wire tolerance shall be in accordance with 16014 (Class T1). Elongation of wire shall be not less than 10% Min qty of metallic coating in accordance with IS 4826 and Zn Al alloy. Gabin boxes should confirm to specification as per IRC : SP 116-2018. Galvanizing All wires used in the manufacture of gabion boxes and in the wiring operations during construction shall be heavily coated with zinc. The adhesion of the zinc coating to the wire shall be strong enough of an extent that when the wire is wrapped six turns round a mandrel of four times of the diameter of the wire, it does not flake or crack to such an extent that an zine can be easily removed by rubbing with the bare fingers. Selvedges All edges of the gabion boxes including end-panel and diaphragms shall be mechanically selvedge in such a way to prevent unraveling of the mesh. The selvedge shall be of a wire having a diameter of 4mm. Fixing After placing in position and before filling the gabion shall be stretched to their full size and shall be stretched to their full size and shall be wired to the adjoining row at the top and bottom edges and at the corners.