Constructionoffoundationfor40 mtHighGround BasedUSO Tower and Erection work at Pecharthal

Amount

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.

(a) 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.

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

(a) All kinds of soil

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

(a) 1:3:6 (1 Cement : 3 coarse sand (zone-III) derived from natural sources : 6 graded stone aggregate 20 mm nominal size derived from natural sources) stone aggregate 20 mm nominal size).

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 :

(a) 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 all heights :

(a) Foundations, footings, bases of columns, etc. for mass concrete

(b) Lintels, beams, plinth beams, girders, bressumers and cantilevers

(C ) 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 upto 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).

Structural steel work riveted, bolted or welded in built up sections, trusses and framed work, including cutting, hoisting, fixing in position and applying a priming coat of approved steel primer all complete.

Fixing tower anchor bolts in the foundation of tower monolithic with RCC casting as described below:

Fixing anchor bolts with locked nuts anchor plates, placing in position the bolts and plates extremely accurate (correct upto milli-meters) levelling and placing at correct angles as per direction of Engineer-in-charge complete excluding cost of anchor bolts / templates , lock nuts & washers which will be supplied by the department or paid separately but including providing T & P etc.

Note: The tower may be a three legged or four legged and accordingly there may be three or four numbers of plates/bolts assembly.Also, each assembly may have bolts in any multiple number. The rate includes for fixing of anchor bolts for all legs of tower including maintaining plate correctly.

Supplying anchor bolts ( for fixing base of tower) made from Mild steel rods (bright finished) (as per IS 2062) of approved make (TATA,JINDAL or equivalant), 25mm dia of required length 1520 mm ( bended at bottom shown as per drawing ), threaded up to 200mm from top including suitable nuts & check nuts and M.S. spring washers with primer etc all complete as per direction of engineer in charge.( rate is inclusive of supplying anchor bolts at work site)

Transportation of tower material including ladder, working platform, cable tray and antenna fixtures, templates and foundation/anchor bolts, nuts of any dia & length and connecting plates etc. all from departmental store /TE or some other city/ place to the site of work under consideration under safety precautions. The item includes sorting (if required), loading, unloading and stacking of the material all complete and as per the directions of Engineer- in-charge.

(a) 40 mt tower weighing approximately 10.25 MT. and distance @ 135.00 kms

Erection of 40 mt high Ground Based self supporting USO tower using NEW tower material or recovered materials after dismantling of existing tower or otherwise. The work shall include the following :

(A) Erection of tower including sorting, assembling, lifting, fitting and fixing up all tower members in position true to the alignment including assembling / hoisting / fixing of ladder, working platform, wave guide rack, lightening arrestor pipe stand etc. at required level all complete as per the manufacturers drawing and as per the directions of Engineer- in-charge. The item includes enlarging holes, making holes in tower member if required, straightening of twisted or bend tower members of any type etc. and all other connected works for the above operation (if and as required) all complete as per the directions of Engineer- in-charge.

(This operation is only for labour charges for erection of tower)

*** Notes:

1.The item INCLUDES for the following and nothing extra shall be paid on this account:

a) The agency shall take every precautions against the damages to the structure or nearby structures while erecting the tower.

b) Necessary safety precautions to protect the human lives, insurance coverage to the labours etc. shall be sole responsibility of agency.

c) Item includes for all operations, tools & plants, equipments, machinery etc. required for the work as well as safety measures as per the relevant IS codes.

2. The item does NOT INCLUDE for the dome lights and its system, lightening arrestor and earthing system for tower. These shall be paid under separate items, if and as required. 3. The item does NOT INCLUDE the supply of tower material / dismantling of old tower & its transportation. These shall be paid under separate items, if and as required.

(a) 40 mt high tower weighing approximately 10.25 MT.

Painting of tower including all accessories etc. complete with superior quality, weather resistant high glow synthetic enamel paint ( two or more coats) in international orange and white shade and of approved brand & manufacture in equal alternate layers to give an even shade as per Aviation requirements over base coat of zinc chromate yellow primer all complete as per the directions of the Engineer-in-charge. (Agency shall arrange for all the material, labour, T & P etc. required for the operation.)

(a) 40 m tower weighing approximately 10.25 MT.

Providing, laying and testing of Ring Earth system by running G.I. flat of size 50 x 6 mm (having 6 mm dia holes at 1m c/c along the length) all-round at 1.0 m away from the tower base in ground at a depth of 1.0 to 1.5 m from ground level in 300 mm wide trench. All tower legs shall be connected to ring earth by 50x6mm G.I. flat. The GI strip finally jointed to the GI plate of size 600x600x6 mm at a requred depth.The jointing of the two GI strips as well as joint in between GI strip and gusset plate of tower leg shall be done with an overlap of 90 mm, sandwiching in between a lead sheet of size 90 x 50 x 1 mm and bolted with 2 nos of 10 mm dia GI nuts/ bolts & spring washers. The jointing between the GI strips shall further be protected / sealed by wrapping properly with ISI marked 2" wide water proof tape. Trench shall finally be refilled with good earth after providing & filling with sand, saw dust, charcol & salt at different layers up to specified depth including measurement of earth resistance by earth megger etc complete as per the direction of Engineer-in-charge. The value of the earth resistance should be less than 2.00 ohm and nothing extra shall be paid for getting earth resistance below 2.00 ohm.

Notes:

1. While laying the GI strips, they should not not be bent sharply at right angles but should be laid in smooth curves of about 1 m radius.

2. The rate includes all the materials and labour required for all the above including lead sheet, water proof tape etc.The rate also include the cost of Excavation & refilling of earth tobe done for earthing.

3. Measurement: Only the net length of GI strip shall be measured for payment. Nothing extra shall be paid for overlapping length etc.

Supplying at site the tower members for new tower or deficient tower members for tower on account of any shortage/ unserviceable material found on dismantling of tower or otherwise. The material required for tower (excluding nuts, bolts & washers) and its ladder, working platform, wave guide rack (vertical), antenna fixtures, pipe stand for lightening arrestor, templates, base plates etc. as required shall be provided in required sectional size and length including drilling holes for bolts etc. all exactly as per and in conformity with the approved drawings of S.E.R.C. and as per the directions of Engineer-in-charge.

Notes:

1. All tower material to be hot dip galvanised. The tower material, fabrication & galvanizing shall be as per the relevant IS code as well as SERC recommendations.

2. This item DOES NOT INCLUDE for supply of nuts, bolts & washers as well as erection, priming & painting of the tower which shall be measured and paid under the separate item.

3. Measurement: Weight of the all the material supplied (weight of each piece in exact length as required as per drawing).

4. The rate includes all material, their carriage, etc. as well as labour and T & P necessary for straightening, cutting, filing, drilling etc., and hot dipped galvanising to all steel members.

Supplying hot dipped Galvanised (Galvanising shall not be less than 85 micron) nuts and bolts of required size and of grade 5.6 and as per IS 12427 including spring & plain washers of required thickness all complete as per direction of the Engineer In Charge. (The rate includes necessary threading etc and payment shall be made for the actual weight of the material supplied at site)

Providing & fixing single spike solid copper lightening arrestor of 650 mm length, 12 mm dia. having necessary threads & brass nut at bottom end of the rod etc. Copper lightening arrestor is to be fixed approximately 1 to 2 m above the top of the tower over a "lightening arrestor pipe stand".all complete as per direction of Engineer in charge.

Supplying, installing, testing & commissioning of LED's (light emitting diodes) lamp of Vijay or BINAY or Avids or Litten or equivalent on circular drum covered with glass and supporting arrangement etc with inbuilt day night sensor and transformer etc complete. The aviation light shall be of low intensity type of approved make which can work at AC supply of 200 to 300 volt.

Supplying & laying of 2x1.5 Sqmm armoured copper conductor Cable "Armoured ISI PVC Insulated & sheathed cable" of approved quality and brand including copper terminations/ Lugs etc. all complete as per directions of Engineer- in-charge. Sheath earthing for the armoured cable shall be done at minimum of two points on the tower as per the standards specified.

Providing and fixing 50 x 3 mm G.I. flat of approved quality for making connection of lightening arrestor from the tower top to the ring /pit earth with necessary clamps, fixtures etc. complete as per direction of Engineer-in-Charge.

BINOY BHOWMIK