Bharat Sanchar Nigam Limited Tender

Columns, Pillars, Piers, Abutments, Posts and Struts

Steel reinforcement for R.C.C. work including straightening, cutting, bending, placing in position and binding all complete above plinth level.

Thermo-Mechanically Treated bars of grade Fe-500D or more

Smooth finishing of the exposed surface of R.C.C. work with 6 mm thick cement mortar 1:3 (1 Cement : 3 fine sand).

Supply of Good quality MS hot dipped galvanized bolts, nuts, plain and spring washers etc. .of different diameter size as specified for tower works.( The item shall be executed for providing in place of the Missing Nuts and bolts if any during dismantling and transportation of tower earlier. The payment shall be made only to the fresh quantity of Materials supplied to the site according to the requirement )

Supplying and Fixing Mild Steel Anchor Bolts of Required Diameter and Length (Diameter Varying from 16mm to 32mm) for Tower Foundation including Making Steel Templates with Necessary Holes to suit the Diameter of the Anchor Bolts including Mechanical threading to the top 15 centimeter length of Bolts , welding with necessary MS Plates at the bottom of independent anchor bolts ,etc. complete .The Anchor Bolts and Template shall be fixed to line and Level keeping the Centre to Centre Distance in tact ,inside the Centering and shuttering of the Tower Beams Before doing concreting of Tower Foundation .(The Rate includes the cost of All Labour involved in the Above operation, Materials, Transportation and Fixing Charges and Nothing Extra shall be Paid on Any Account)

Supply of Tower Materials conforming to ISRC Specifications Supply of missing tower members of RTT using MS hot dipped galvanized angles section conforming to specification attached to respective towers including ladder, working platform, antenna fixtures, GI Nut and bolts etc. . MS angles of Yst 22/210 grade and conforming to IS 1161

Anchoring Reinforcement bars of 12mm to 32mm dia to existing RCC Structural Members with approved High strength Epoxy Adhesive to Provide Strength to the New structure including columns, Beams, Slabs and Footings etc. consisting of the Following operations

i) Core Drilling using Power Drilling Tool to a depth of 25cm including Driving the tool and removing the Debris ,dust by vacuum cleaner and preparing the Anchor Hole ready and clean for the Application of Chemical. (ii) Applying High Strength Injectable Mortar ( An Epoxy adhesive of Two compounds ) in equal proportions with the Application Gun to the Full length of the Anchor Hole. (iii) Inserting the Reinforcement Bars to the Anchor Hole in such a way to ensure that the tip of Reinforcement bar shall be met with the concrete end /reinforcement and bonded with the Applied Chemical and to the peripheral Concrete Surface and till the surplus Chemical Comes out of the Anchor Hole to ensure that the Anchor Hole is Void Free. (iv) Leaving the Anchor Reinforcement free for 10Minutes without shaking /pulling in/Pulling out till the Anchor rod is completely Bonded with the core periphery. The work shall be carried out as per the Directions of the Engineer-in-charge.(The Rate is inclusive of All material and Labour involved in the Above operation and Nothing extra shall be paid on Any Account)

Transportation of tower materials by mechanical transportation from Mission Quarters Compound (Thrissur) to Valavanangadi Tower Site including loading, unloading, segregating and stacking as per direction of Engineer-in-charge.(The Distance for Transportation is approximately 31 km)

Erection of Three / four legged light weight GI Roof Top Communication tower including assembling the Structural Members of the Tower ,tightly connecting with GI nuts, bolts ,plate washers ,ring washers etc. including making use of necessary hoisting / climbing arrangements , safety belts and all necessary precautionary measures to safeguard the building , working labors and general public etc. to form the Finished Tower to Conform the Standard Drawings /Design/Alignment etc. complete .

Re-painting of Ground Based / Roof Top Telecommunication tower (Light / Heavy weight) including ladder, antenna mounts, cable trays, gantry etc. as per the following operations:

a) Scraping / Cleaning of the old paint of tower in order to get rid of peeled off paint / scalings of tower, removing dust and scalings of rust ,dirt etc. by sand papering and finally cleaning the surface with cotton waste . b) Tightening of All the bolts and nuts after replacing the missing nuts / bolts if any , the payment of which shall be made separately . c) Applying a coat of Etch primer which consists of polyvinyl butyral phosphoric acid catalyst and cellulose base . The primer shall be mixed in the specified ratio of 4 ( four ) parts of cellulose base to 1 ( One ) part of catalyst or as specified by the manufacturer. d) Applying priming coat with 1 (One ) coat of zinc chromate yellow primer of approved brand and manufacturer over the Etch primered surface of tower members e) Painting the Members of the tower with 2 ( Two ) coats of Synthetic Enamel paint Using the colours viz. deep orange and white in intermittent segments as per DGCA guidelines and with the deep orange portion strictly coming on the top segment of tower .All the Materials used in the work shall be of approved brand and manufacturer and the work shall be carried out all as per the directions and instructions of the Engineer-in-charge.

Supplying and installing Chemical Earthing Electrode-(GI), 50 mm dia, 3 mtr length electrodes including drilling / auguring minimum 150 mm dia holes upto 3 metres depth, inserting electrode, backfilling the sides with soil mixed with BFC ( Back fill compound)- for 3 mtr depth and providing with Poly plastic chamber with cover etc. complete in ordinary soil. The whole work is to be done as per the instruction of the Engineer-In-Charge and the resistance value checked after installation should meet the A/T standards. The rate is inclusive of all taxes and service charges and nothing extra shall be paid on any account.

Providing G I strips of size 50x3 mm one end connected to the tower leg with G I bolts and nuts [with lead sheath in between] including providing and connecting the legs at the bottom of tower and the other end shall be connected to the G I plate earth/ring earth with G I bolts and nuts [with lead sheath in between] including clamping the down lead flat to walls/stems without any sharp bends using necessary clamps and screws as directed by the Engineer-in-Charge. (All joints should be covered by Shalimar or equivalent water proof tape and made air tight)

Providing and fixing copper lightning conductor of 1500mm length, 25mm dia hollow tube of wall thickness not less than 1.6mm…including tinning the bottom portion of the spike for a length not less than 150 mm (lightning conductor to be fixed at the top of the tower) and connecting the GI bus bar to the lightning arrester using 2 Nos. 10 mm dia brass bolts and nuts all complete as directed by the Engineer-in-charge. (All joints should be covered by Shalimar or equivalent water proof tape and made air tight]

Providing GI bus bar of 50 x 3 mm connected to the tinned bottom portion of lightning conductor and to the ring earth/plate earth with 2 no.s of 10 mm dia GI nuts & bolts [with lead sheath in between] at each connection. The bus bar shall be drawn through heat shrink sleeve and shall be shrunk properly. The bus bar shall be clamped to the tower/ building walls at uniform interval of 1.5 Mt.. using proper GI clamps and ceramic insulators such that the bus bar shall be well insulated from the tower building walls all complete as directed by the Engineer-in-charge. (All joints should be covered by Shalimar or equivalent water proof tape and made air tight)