40m GBT Haripad

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

Excavation work by mechanical means (Hydraulic excavator)/ manual means in foundation trenches or drains (not exceeding 1.5m in width or 10 sqm on plan), including dressing of sides and ramming of bottoms, lift upto 1.5 m, including getting out the excavated soil and disposal of surplus excavated soils as directed, within a lead of 50 m.

All kinds of soil

Close timbering over areas including strutting, shoring and packing cavities (wherever required) etc. complete. (Measurements to be taken of the face area timbered):

Depth exceeding 3 m but not exceeding 4.5 m

Extra for every additional lift of 1.5 m or part thereof in excavation / banking excavated or stacked materials

All kinds of soil

Filling available excavated earth (excluding rock) in trenches, plinth, sides of foundations etc. in layers not exceeding 20cm in depth, consolidating each deposited layer by ramming and watering, lead up to 50 m and lift upto 1.5 m.

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 (zone-III) derived from natural sources : 4 graded stone aggregate 20 mm nominal size derived from natural sources.

1:4:8 (1 Cement : 4 coarse sand (zone-III) derived from natural sources : 8 graded stone aggregate 40 mm nominal size derived from natural sources.

Providing and laying in position specified grade of reinforced cement concrete, excluding the cost of centering, shuttering, finishing and reinforcement - All work up to plinth level :

1:1.5:3 (1 cement : 1.5 coarse sand (zone-III) derived from natural sources : 3 graded stone aggregate 20 mm nominal size derived from natural sources)

Centering and shuttering including strutting, propping etc. and removal of form for

Foundations, footings, bases for columns

Lintels, beams, plinth beams, girders, bressumers and cantilevers

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).

Supplying and placing of anchor bolts in sets including all labours and handling charges and checking with template in line level, plumb etc. as required. Length L = 900 mm MS rod, dia Ø = 32 mm, including 150 mm top galvanized threading, two nuts and washer to be provided, all complete as per details given in the drawing.

Supply of MS hot dipped galvanized structural steel members, bolts, nuts, washers etc. of different sizes as specified for tower works.

Erection of four legged light weight communication tower (NB), segment wise as per erection drawings and design

40 m tower

Providing and applying paint of approved specification over the four legged light weight communication tower ( NB ) One coat of Etch Primer (MRF, Asian paint or equivalent) should be applied first followed by one coats of zinc chromate primer .Over that two or more coats of enamel paint Orange/ White of approved brand and manufacture should be applied.) All works to be completed as per the directions of the Engineer in charge

40 m tower

Providing G I plate earth including excavation of pit of size 2000x2000x3000mm depth in all kinds of soils and placing four numbers of G I plates of size 600x600x6 mm thick vertically at diagonally opposite ends in the excavated pit and inter connecting the plates with 4 Nos. of 50x3mm G I strips with 2 no.s of G I bolts and nuts of 10mm dia at each connection and covering the joints with bitumen, placing G I pipe of 50mm internal dia ( B Class) and 3000mm length at the center of the plate grid for watering and filling the pit with fine ash and / or finally sieved good quality soil including ramming in 20 cm layers etc. complete and cover the pit with 750x750x50mm thick precast reinforced cement concrete slab having 100mm dia hole at the centre to pass the GI pipe and construct a chamber of Internal size not less than 280x280x250mm with half brick wall including fixing CI manhole cover of size 300x300mm of weight not less than 7.20 Kg. (cover & frame) and plastering the chamber on all sides with cement mortar 1:4 of 12mm thick (1 cement : 4 fine sand) and including disposal of surplus excavated earth if any within a distance of 5 Km lead as directed by the Engineer-in-Charge.

Providing ring earth including necessary provision for connecting earthing for aviation lamp including excavation of trench of size 500 x 500 mm depth upto coral rock and laying GI flats of size 50 x 3 mm and jointing flats with plate earth vide item No.14 above and jointing at corners with 2.Nos. of 10 mm dia GI bolts and nuts with necessary spring washers and refilling the trenches with the excavated soil free from stones and disposal of surplus soil within 5 km lead as per the direction of the Engineer-in-charge.

Providing GI strips of size 50 x 3 mm one end connected to the tower leg with GI bolt and nuts including providing and connecting all-round the four legs at the bottoms of tower and the other end shall be connected to the GI plate earth as per item with GI bolts and nuts 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.

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 brass nuts & bolts at each connection. The both ends of the bus bar shall be tinned properly and the entire length of 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 mtr using proper clamps such that the bus bar shall be well insulated from the tower building walls all complete as directed by the Engineer-in-charge.

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