8278 SPECIAL REPAIRS OF BOUNDARY WALL AT NAVAL DOCKYARD MUMBAI UNDER GE (NW) KUNJALI, COLABA, MUMBAI

Providing and erecting at site self supported steel H- Frame Scaffolding only for structural repairs of column with micro concerte or columns jacketing with cross bracings of good quality without dents and corrosion to reach place of work including approchases, extensuion, working platform ladders, lifting tackel necessary wall anchores for men and materials till completion of all structural repair items of work and curring period etc. complete. The work should be caried out with all the safety belt and adequate labour insurance under the supervision of qualifed supervisor this item should be used only for structural repair work for entire period of building. (Payment should be only once irrespective of duration of scaffolding.)

Providing and fixing 6mm thick plywood covering panels in pattern upto 30m height as per the directions of Engineer-in-charge with necessary backing framework to shield windows etc. from falling debris and removing and taking away the material after completion of work (the covering material will be the property of contractor after completion of work) including making good any incidental damage(s) to the existing building or its finishes etc complete. (The measurements for payment shall be made in terms of the area protected by such covering). Only one weightage will be given for covering windows till finishing irrespective of time-period of protection.

Carefully tapping with light hammer the hollowness / De-bonded plaster and chipping the same with chisel after demarking and cutting the boundary grooves by electric cutting machine including removal of debris,scaffolding and green cloth .

Breaking carefully the loose concrete of distressed member without damaging existing strong concrete by means of sharp chisel which should tempered regularly of high frequency low impact hammer is used, cleaning the surface by water jet pressure pump at 4 to 5 kg/ sq.cm pressure to remove chlorides and loose partials, air drying the surface etc. The work should be carried out with all the safety measures like helmet, safety belt and adequate labor insurance under the supervision of qualified supervisor. (The damaged ceiling / concrete will be measured) etc. Complete.

Providing and erecting steel tubular props of required height up to 14' feet, L head or flat head braced at center and supporting a continuous 2"X 3" wooden runner, resting on wedge and block minimum capacity 3 Ton to support the structure provisionally during repair and jacketing etc. and maintain them in position till required item etc. complete. The props are erected in perfect vertical in plumb taking /transferring the load equally/ uniformly. The location of every prop should be one over another floor and it should not be eccentric. The tightening of every prop should be uniform to all props to strain the building uniformly, removing the same as and when directed by structural engineer/ site Engineer. The work should be carried out with all the safety belt and adequate labour insurance under the supervision of qualified supervisor and remove the same completion of work etc. complete.

Demolition of unreinforced cement concrete of any description and in any position not otherwise specifically provided for etc complete all as specified.

Demolition of Brickwork/stone or boulder masonry,built in cement mortar or cement lime mortar including all quoins,arches,pillars, etc, but excluding ashlar facings,dressed stonework and precast concrete articles etc complete all as specified.

Cleaning the existing reinforcement with hammer tapping and wire Brush/ rotary wire brush , fixed to hand drill machine, making the surfaces free form loose corrosion material, dirt scaling etc. complete. Applying two coats of polymer based alkaline rust converting primer confirming to ASTM-B 117 by means of paint brush, liberally all over in two coats of 1 hour between the costs, The product should converts the rust in to stable organo metallic complex molecule layer, this should also act as primer to further treatment of steel etc. complete. The work should be carried out with all the safety belt and adequate labour insurance under the supervision of qualified supervisor. (the damage celling/ concrete al be measured) etc. complete.

Anticorrosive treatment to Reinforcement application of two coats of IPNETRB (CBRI known how) on expose reinforcement in two coats with time interval) of minimum 4 hours between each coat. The application shall be by brush, Application is allowed to dry for further treatment. The work should be carried out with all the safety measures like helmet, safety belt and adequate labour insurance under the supervision of qualified supervisor. (The damage ceiling / concrete all be measured) etc. complete.

Replacing distressed / loose/ cracked/ porous carbonated, loose part of concrete and repairing the damaged surface of concrete , fix the form work/ structural element, pour the free flow ready mix micro concrete mix with 5 1t to 7 1t of water in the form work. Micro concrete should be mixed in steel tray homogeneously makeup concrete is based on types of structural element and its location. The work should be carried out with all the safety measures like helmet, safety belt and adequate labour insurance under the supervision of qualified supervisor etc. complete.