Restoration of Damaged Diversion Tunnel (DT) at Baira Dam of Baira Siul Power Station

Earth work in excavation by mechanical means (Hydraulic excavator)/manual means over areas (exceeding 30 cm in depth, 1.5 m in width as well as 10 sqm on plan) including getting out and disposal of excavated earth lead upto 50 m and lift upto 1.5 m, as directed by Engineer-in-charge.All kinds of soil

Carriage of Earth By Manual Labour including loading, unloading and stacking for lead less than 0.50 KM (Lead=350m)

Providing and fixing mild steel tubes for dewatering systems with gravity based water tank & pipe arrangement.

Providing and laying in position machine batched and machine mixed design mix M-25 grade cement concrete for reinforced cement concrete work, using cement content as per approved design mix, including pumping of concrete to site of laying but excluding the cost of centering, shuttering, finishing and reinforcement, including admixtures in recommended proportions as per IS: 9103 to accelerate, retard setting of concrete, improve workability without impairing strength and durability as per direction of Engineer-in-charge : All works upto plinth level : Cement content considered in this item is @ 330 kg/cum. Excess/ less cement used as per design mix is payable/recoverable separately)

Centering and shuttering including strutting, propping etc. and removal of form for : Walls (any thickness) including attached pilasters, butteresses, plinth and string courses etc.

Providing and laying in position cement concrete of specified grade excluding the cost of centering and shuttering - All work up to plinth level : 1:2:4 (1 Cement : 2 coarse sand) : 4 graded stone aggregate 40 mm nominal size)

High Performance Concrete (HPC) grade M65 in spillway/glasis and spillway u/s of bulk head gate curve portion.

Steel reinforcement for R.C.C. work including straightening, cutting, bending, placing in position and binding all complete upto plinth level. Mild steel and Medium Tensile steel bars

Drilling of 32mm dia holes for 25mm dia steel anchors and 500mm deep into old concrete by way of jack hammer or other suitable equipment

Providing, Fabrication and Installation of steel liner plate (Confirming to IS -2062:2011) including rolling to the required radius as per drawing and welding with approved electrode having excellent mechanical properties for heavy joints under restraint and subjected to dynamic loading.

Providing and applying epoxy grout/mortar complying with ASTM C881 type IV, class C with min characteristic bond strength of 10 MPA.

Providing and installing 24 mm dia anchor nut in 24 mm dia chemical anchor (Grade 8.8 , M24 of Hilti/Fischer) for anchoring as per technical specifications including the cost of all materials carriage, staging scaffolding and labour etc. complete finished item.

Providing and installing 24 mm dia chemical anchor (Grade 8.8 , M24 of Hilti/Fischer) in drilled holes for anchoring as per technical specifications including the cost of all materials carriage, staging scaffolding and labour etc. complete finished item.

Drilling 28 mm dia hole for 24 mm anchors

Epoxy resin system of approved make filling in drilled holes for anchoring as per technical specifications including the cost of all materials carriage, staging scaffolding and labour etc. complete finished item.

Providing and applying epoxy resin binding agent complying with ASTM C881-78 type II, grade 2 class B or C before laying of HPC for glacis repair.

Surface preperation of old concrete by cleaning methods like compressed air/ high pressure water blast/ sand blast, chipping, wire brush or other means for laying of repair mortar as per technical specifications i/c all stages and scaffolding etc. (complete finished item with all leads and lifts )

Providing and applying high performance cementitious mortar (sika mono top - 412 (N) on exposed/ eroded concrete surface as per technical specification. Generally, the thickness of the layers shall be kept 12.5 mm. (Complete finished items with all lead and lifts)

Providing & Grouting of dowel tubes / Shear keys / Joints of precast members with M-60 grade cementitious grout (Non Shrink) of approved make by suitable means ( Free flowing / pump),curing etc. Complete as per directions of Engineer-in- charge. (The payment shall be made on the basis of actual weight of approved grout injected.)