Civil repairs and maintenance of Vypin Lighthouse Station

Repair works to cracks in plastering / masonary / R.C.C. works: Providing and applying crystalline mortar by mixing in the ratio of 4.5 : 1 (4.5 parts crystalline mortar : 1 part water) for the treatment of faulty construction joints, cracks, tie rod holes and spalled & honeycombed surface of RCC underground structures like basement, water tanks, bridge deck etc. to ensure water tightness. The crystallie mortar shall conform to the EN 1504-3 having compressive strength Class R4 ≥45 MPa and adhesive bond strength Class R3 ≥1.5 MPa. The work shall be carried out all complete as per specification and the direction of the engineer-in-charge. The product performance shall carry guarantee for 10 years against any leakage.For sealing cracks and faulty construction joints, routed out/ making U-shape groove size 25x25 mm and then primed the area with integral crystalline slurry @0.05 kg/running metre and while the surface is tacky filled the groove upto surface with crystalline mortar @1.50 kg/running metre. Once crystalline mortar is touch dry then finally applied two coats of integral crystalline slurry @0.05 kg/running metre per coat.including cost of all materials, labour,scaffolding, tools & plants etc complete as direction of Engineer-In-Charge .

Chipping of unsound/weak concrete material from slabs, beams, columns etc. with manual Chisel and/ or by standard power driven percussion type or of approved make including tapering of all edges,making square shoulders of cavities including cleaning the exposed concrete surface and reinforcement with wire brushes etc. and disposal of debris for all lead and lifts all complete as per direction of Engineer-In-Charge .

Providing, mixing and applying epoxy bonding adhesive having coverage 2.20 sqm/kg of approved make on chipped portion of RCC as per specifications. including supply of all materials, labours ,scaffolding tools & plants etc. all complete as per direction of Engineer-In-Charge .

Providing and laying SBR Polymer modified (of approved make @ minimum 2% by wt. of cement used) plain/reinforced concrete jacket for the structural members e.g. columns, pillars, piers, beams etc with concrete having the specified minimum characteristic compressive strength [with ordinary portland cement, coarse sand and graded stone aggregate of 10 mm maximum size in proportion as per design criteria] with specified average thickness all-round existing core of RCC member. Note: Rates shall be for finished surface area of concrete and shall include the cost of making holes in existing RCC slab, if required, for pouring concrete in shuttering mould of jacket and appropriate approved Super-Plasticiser for rendering concrete as flowable self compacting and SBR polymer but shall exclude cost of reinforcement, bond coat, Shear Keys, centering and shuttering, strutting, propping etc (Payment under this item shall be made only after proper wet curing has been done and surface has been satisfactorily evaluated by sounding/tapping with a blunt metal instrument) 75 mm thick in Grade M25 with cement content not less than 330 kg per cum. including cost of all materials, labour,scaffolding, tools & plants etc complete as directed.

Dismantling old plaster or skirting raking out joints and cleaning the surface for plaster including disposal of rubbish to the dumping ground within 50 metres lead including cost of all labour, tools & plants,scaffolding etc complete as direction of Engineer-In-Charge .

15 mm cement plaster on the rough side of single or half brick wall of mix : 1:4 (1 cement: 4 fine sand)including cost of all materials, labours, tools & plants,scaffolding etc. complete as direction of Engineer-In-Charge .

Providing and laying water proofing treatment in sunken portion of WCs, bathroom etc., by applying cement slurry mixed with water proofing cement compound consisting of applying : (a) (b) First layer of slurry of cement @ 0.488 kg/sqm mixed with water proofing cement compound @ 0.253 kg/ sqm. This layer will be allowed to air cure for 4 hours. Second layer of slurry of cement @ 0.242 kg/sqm mixed with water proofing cement compound @ 0.126 kg/sqm. This layer will be allowed to air cure for 4 hours followed with water curing for 48 hours. The rate includes preparation of surface, treatment and sealing of all joints, corners, junctions of pipes and masonry with polymer mixed slurry including cost of all materials, labour,scaffolding, tools & plants etc complete as direction of Engineer-In-Charge .

Applying priming two coats with cement primer of approved brand and manufacture, having low VOC (Volatile Organic Compound ) content. With water thinnable cement primer on wall surface having VOC content less than 50 grams/litre including cost of all labour,scaffolding, tools & plants etc.complete as direction of Engineer-In-Charge .

Providing and fixing 4 mm thick float glass pane (weight not less than 10 kg/sqm).after removing the broken glass from aluminium frame and fixing with snap beading including cost of all materials, labour, tools & plants,scaffolding etc complete as direction of Engineer-In-Charge .

Dismantling wood work in frames, up to 10 metres span and 5 metres height including stacking the material within 50 metres lead :Of sectional area 40 square centimetres and above including cost of all materials, labours, tools & plants etc. complete as directed.