Repair to false ceiling, Structural repair to Ceiling and water proofing work for Electrical Division office, Telephone Bhawan, Port Blair

Amount

Dismantling aluminium/ Gypsum partitions, doors, windows, fixed glazing and false ceiling including disposal of unserviceable material and stacking of serviceable material with in 50 meters lead as directed by Engineer-in-charge.

Disposal of building rubbish / malba / similar unserviceable, dismantled or waste materials by mechanical means, including loading, transporting, unloading to approved municipal dumping ground or as approved by Engineer-in-charge, beyond 50 m initial lead, for all leads including all lifts involved.

Extra for providing and mixing water proofing material in cement concrete work in doses by weight of cement as per manufacturer’s specification.

Providing and fixing 12mm thick prelaminated particle board flat pressed three layer or graded wood particle board conforming to IS:12823 Grade l Type ll, in panelling fixed in aluminum doors, windows shutters and partition frames with C.P. brass / stainless steel screws etc. complete as per architectural drawings and directions of engineer-in-charge. (a) Pre-laminated particle board with decorative lamination on one side and balancing lamination on other side.

Providing and fixing 6 mm dia. G.I. level adjusting hangers (upto 1200mm length), fixed to roof slabs by means of ceiling cleats made out of G.I. flat 40x3mm size 60 mm long and stainless steel expandable dash fastener of 12.5 mm dia and 50 mm long, complete as per direction of Engineer -in-charge.

Grading roof for water proofing treatment with (a) Cement concrete 1:2:4 (1 cement : 2 coarse sand : 4 graded stone aggregate 20mm nominal size)

12 mm cement plaster 1:2 (1 cement: 2 stone dust)

Distempering with 1st quality acrylic distemper, having VOC (Volatile Organic Compound ) content less than 50 grams/ litre, of approved brand and manufacture, including applying additional coats wherever required, to achieve even shade and colour.

(a) One coat.

(b) Two coats.

Applying priming coats with primer of approved brand and manufacture, having low VOC (Volatile Organic Compound ) content. (a) With water thinnable cement primer on wall surface having VOC content less than 50 grams/litre.

Painting with synthetic enamel paint of approved brand and manufacture of required colour to give an even shade : (a) One or more coats on old work.

Providing and laying APP (Atactic Polypropylene Polymer) modified prefabricated five layer, 3 mm thick water proofing membrane, black finished reinforced with glass fibre matt consisting of a coat of bitumen primer for bitumen membrane @ 0.40 litre/sqm by the samemembrane manufactured of density at 25°C, 0.87 - 0.89 kg/litre and viscocity 70 - 160 cps. Over the primer coat the layer of membrane shall be laid using butane torch and sealing all joints etc., and preparing the surface complete. The vital physical and chemical parameters of the membrane shall be as under : Joint strength in longitudinal and transverse direction at 23°C as 350/300 N/5 cm. Tear strength in longitudinal and transverse direction as 60/80N. Softening point of membrane not less than 150°C. Cold flexibility shall be upto -2°C when tested in accordance with ASTM, D - 5147. The laying of membrane shall be got done through the authorised applicator of the manufacturer of membrane : (a) 3 mm thick

Structural repairs to RCC members due to corrosion of reinforcment (and subsequent cracking and spalling) involving following operations.

a)Removing completely cracked/ loose concrete by gentle taping of the affected portions ( no heavy hammering shall be resorted to) followed by chiselling, if necessary, to expose the corroded reinforcement bars completely, ensuring that all loose scale and corrosion deposits on bars are fully removed with an all round minimum celarance of 2-3 mm around the corroded bars. Steel shall be cleaned to a bright condition preferably with grit-blasting. Reinforcment corroded more than 40 % of the original section, shall be replaced with equivalent new bars, duly welded to sound main bars on both ends. ( cost of providing new reinforcement bars will be paid for seperately ). The freshly exposed concrete portions shall be cleaned throughly to completely remove corrossion deposits, any loose/flaky portions, smearings etc. to yield a clean and rough textured surface.

b) Priming the exposed steel and concrete surfaces to be carried out as follows. The thoroughly cleaned reinforcing bars shall be coated with an anticorrosive epoxy primer such as CERAZINC ZR of M/s CERACHEM or equivalent chemical of reputed manufacturers. The primer shall be an epoxy, two component, zinc rich liquid packed and supplied ready to use with unbroken 40 microns ( dry film thickness) coating and capable of providing active galvanic protection. It shall have suitable viscosity to enable the coating to penetrate in to imperfections and pits within the surface of structural steel. The freshly exposed and cleaned concrete surfaces shall be primed with epoxy based bonding agents such as CERABOND EP of M/S. CERACHEM of equivalent chemical of reputed manufactures. The concrete substrate should be thoroughly dampened with water and any excess water removed prior to the application of primer. It shall then be primed by throughly applying a slurry coat of bonding agent with water and cement in the proportion recommended by the manufacturer. (This shall be done immmediatly prior to the rebuilding of the concrete section).

c) Rebuilding / reinstating the structural members to their original dimensions by building up with two component high build structural grade polymer based cementitious reinstatement mortar such as CERA FIBRECRETE of M/s. CERACHEM or equivalent chemical of reputed manufacturers. The reinstatement mortar ( CERA FIBRECRETE or equivalant) shall be applied as soon as the bonding agent. CERA BOND EP or equivalent ) becoms tacky. The bond coat becomes tacky in about 2 minutes and the mortar shall be applied within 5-120 minutes. The entire mixing and application of the chemicals shall be carried out as per the instructions of the manufacturer.

d) Finishing the surfaces smooth with polymer modified cementitious mortar formed by mixing cement with epoxy based mortar modiying agents such as CERA BOND EP of M/s. CERACHEM or equivalent chemical of reputed manufacturers, in the proportion recommended by the manufacturer, the nominal thicknes of rendering shall be 6 mm. (Rates for the above operations shall be inclusive of the cost centring, shuttering and scaffolding required)

Removing existing damaged APP modified membrane/ Bitumen Felt from the terrace and parapet fully without disturbing the installed equipments(if any) kept over the terrace and clearingg the small unwanted pedestals over terrace and disposing all unserviceable materials safely away from site.

Making false ceiling with available aluminium angles, tees, boards including supplying necessary C.P. brass/stainless steel sunk screws as per direction of the Engineer-in-charge.

Supplying anodised aluminium sections(minimum 50 micron anodic coating) for partitions,doors, false ceiling and similar works comprising of angles, tees, tubes etc including transportation but excluding fixing.

Cutting and uprooting trees over terrace/ parapet wall/head room/out side of departmental building by making necessary scaffolding, taking all care for safety of work personnel and applying chemicals to curb further growth including making good the damages to structures with cement concrete 1:2:4 as per direction of the Engineer-in-charge.