Supply, Erection, Testing & Commissioning of 66kV S/C line on D/C panther tower from 66kV Kidiyanagar substation to M/s Executive Engineer Water resource investigation division, for unit PS-1 for catering 9350 KVA new power demand at 66KV voltage class Package-1: from 66kV Kidiyanagar Gantry to AP-31/0 having line length 9.24Rkm (OH-09.09Rkm + UG-0.15Rkm) (630Sqmm (3+1)) under Anjar Circle. (Only OH Portion)

Sr. No. Description Unit Earth wire Conductor

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

1. Name/Type ** Galvanised ACSR Dog

2. Size mm 7/3.15 6/4.72/Aluminium

3. Configuration ** One continuously **

To run horizontally

On the top of the

Towers & conductors

4. Overall diameter mm 09.45

5. Unit mass Kg/Km. 426

6. Min. UTS KN 58.4

7. Ruling Design Span Meters 280

8. Area of cross-section mm^2 54.55

9. Maximum working Tension at:

i) 32 Deg. C with full wind Kg 1311 1245 kg

ii) 0 Deg. C with 2/3rd full wind 1420 1310 kg

10. Maximum sag under maximum * 5.991 Mtr. at

Temperature and no wind 67 deg. C.

11. Modules of elasticity 1.933x106 8.055x106 Kg

12. Co-efficient of linear 11.5x10^-6 19.1x10^-6/

B. ACSR Panther Conductor and Earth wire for Single Conductor

Sr. No. Description Unit Earth wire Conductor

1. Name/Type ** Galvanised ACSR Panther

2. Size mm 7/3.15 30/3.00Aluminium

3. Configuration ** One continuously **

To run horizontally

On the top of the

Towers & conductors

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

4. Overall diameter mm 09.45

5. Unit mass Kg/Km. 426

6. Min. UTS KN 58.4

7. Ruling Design Span Meters 300

8. Area of cross-section mm^2 54.55

9. Maximum working Tension at:

i) 32 Deg. C with full wind Kg 1410 2763 kg

ii) 0 Deg. C with 2/3rd full wind 1522 3139 kg

10. Maximum sag under maximum * 6.053 Mtr. at

Temperature and no wind 67 deg. C.

11. Modules of elasticity 1.933x106 8.158x106 Kg

12. Co-efficient of linear 11.5x10^-6 17.8x10^-6/

B (I) Details of Insulator (Silicone Rubber Insulator)

1) Size of discs NA

2) Number of discs Single unit Double unit

i) Suspension string 1 string 2x1 string

ii) Tension string 1 string 2x1 string

Type of ACSR Dog Panther

3) Description of string Electro mechanical Length Approx.

strength in KN without Weight in Kg.

a) Single 90 KN 90 KN 870

b) Double 90 KN 90 KN 870

c) Single Tension 90 KN 120 KN 870 15

d) Double Tension 90 KN 120 KN 870 30

B (II) Details of Insulator (Anti-Fog Disc Insulator)

Sr. Details 120KN 90KN

1 Type Ball & Socket Ball & Socket

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2 Height – mm 145

3 Diameter – mm 280 or 305 255 or

4 Creepage – mm (Min.)

5 Ball Diameter – mm 20

6 Colour Brown Brown

7 Surface Glazed Glazed

Socket Cap Malleable Cast Iron / SGI Hot Dip Galvanised

Ball Pin High Tensile Forged Steel (Hardened & Temp-

ered) Hot Dip Galvanised

Security Clip Phospher Bronze Or Stainless Steel

Zinc Sleeve 99.95% Pure Zinc

Insulator Porcelain

9 Shape of Security Clip R/W

10 Dimensions of Zinc

Exposed Length from

Total Length (Min.)

11 Minimum Failing Load –

12 Minimum Electro

Mechanical Load – Kg. 12500

13 Visible Discharge Test

Voltage – KV (Min.) 9

14 Dry Impulse Flash Over

Voltage – KV (Min. +ve

Peak Wave – 1.2/50

15 - DO – But For –ve

16 Dry Impulse Withstand

Voltage – KV (Min. +ve

Peak Wave – 1.2/50

17 - DO – But For –ve

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GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

18 Power Frequency Flash

Over Voltage – KV

19 Power Frequency

Withstand Voltage – KV

20 Power Frequency

Puncture Voltage – KV

(RMS – Min.) 140

21 Eccentricity of the disc

(i)Axial run out Max.11.2mm

(ii)Radial run out Max.8.4mm

B (III) Details of Insulator (Plain Disc Insulator) – Not applicable

C Insulator hardware:

(i) Slipping Strength : ACSR conductor Dog/Panther

(a) Suspension Clamps : 8 - 15% of ultimate strength of

(b) Tension Clamps : 95% of ultimate strength of

(i) Minimum Failing Load : ACSR conductor

(ii) Suspension Fittings : 50%of ultimate strength of

(a) Tension Fittings : 100% of U.T.S. of conductor

(a) Suspension Clamps : Forged Steel Hanger free center

type without bolt only

(b) Tension Clamp : compression type

(i) Material : Aluminium/ steel

(ii) Ele. Resis. At 200 C : 75% of measured resistance of

equal length of conductor

(iii) Ferrous Parts : Hot dip galvanized

(iv) No. of A/F disc insulators to be : 05 for Suspension

used 06 for Tension

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

EXECUTION OF WORK

1.1 The erection works covered under this section consist of

a. Check survey with preparation of profile, GETCO will provide the details

of the line alignment as per survey carried out for taking reference to

proceed further for the work of check survey.

b. Delivery of tower material including Bolt-Nuts accessories, Base plate

assembly, earth wire, and hardware accessories, insulators etc. and

transportation to erection site and keeping in safe custody.

c. Insurance of material during storage-cum-erection.

d. Distribution of materials at erection site,

e. Excavation, stub-setting, pile foundation, concreting, back-filling etc.

complete work of foundation including dewatering, shoring & shuttering,

cutting of stubs, fabrication and supply of chimney material and form

f. Tower erection including fixing of attachments, accessories, base plate

assembly and tack-welding including supply and application of primer and

2 coats of zinc rich paints for bottom most two panel (up to 10 Meter)

g. Stringing of ACSR conductor (As per scope) and one ground wire up to

sub-station gantries at both ends with the help of tensioner and puller

machine or manual.

h. Guarantee of all the activities carried out from (a) to (g).

i. Other items not specifically mentioned in this Specification and are

required for the successful erection and commissioning of the

transmission line, unless specifically excluded in the Specification.

1.2 The successful Bidder shall carry out all addition / alteration required for

completion of line and up to commissioning the same at rates quoted in the offer

for respective item. However, no items are to be executed for which prices not

1.3 All works shall be carried out in accordance with the revised and latest

provisions under Indian Electricity Act and Rules made there under.

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

1.4. All the erection tools required during construction of lines shall be arranged by

the Bidder at his own cost. The Bidder shall only be responsible for any damage

to and / or loss of his erection tools.

1.5 Quantities given in the Schedule of erection in price Bid are to be executed by

the Bidder at the rates accepted by the GETCO in the A/T. In case of any

deviation in tower quantity / type of tower / length of line, excavation / concreting

resulting into an increase in which event the field officer shall obtain prior

approval of the Corporate Office and excess quantity shall be paid only at the

accepted rate of the A/T.

1.6 The erection work beyond contractual ceiling amount shall be done only after

approval from the GETCO.

1.7 In case of pile foundation, if the bidder does not have necessary experience,

some other qualified agency may be engaged by the bidder for design and

casting of pile foundation. However, the overall responsibility shall be of the

Bidder and shall be responsible for all the necessary co-ordination with the pile

foundation contractor including stub-setting (As per IS 2911-1980).

2.1. The Bidder has to make check survey and preparation of the profiles as per the

details of route alignment already carried out by GETCO. The complete route

alignment along with the other details as given below will be furnished to the

successful bidders for further execution of the work. If any minor modification in

alignment of the route, during check survey or while scrutiny of check survey is

required, the same shall be carried out by the Bidder at no extra cost to the

a) Survey report

b) Brief Summary of the Project

c) BOQ for type wise Towers with extensions

d) BOQ for tower type wise foundation

e) Details of angle points with latitude and longitude

f) List of the major crossings

g) Details of trial pits along the route

h) Complete route alignment fixed on the toposheet

3.0 ACCESS TO LOCATIONS:

3.1 It will be the Bidders sole responsibility to take the materials up to the location.

Any path way, temporary road, temporary bridge required will have to be

provided by the Bidder at his own cost. If, for any reasons the above is not

feasible, the Bidder at his own cost shall have to arrange transportation by head

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

3.2 The Bidder will be deemed to be very well familiar with the route of the

transmission line before submitting an offer. Notwithstanding the difficulties of

terrain, location approaches, way leave and other obstructions the price quoted

for all the items of erection shall not undergo any change at any stage or

granted by the GETCO for any special rates/consideration.

4.0 EXCAVATION:

4.1 The excavation will be limited to the volumes as per approved excavation

drawings even though the Bidder may excavate more for the sake of his own

convenience or for any reasons. If the excavated dimension/s is/are more than

the dimension/s shown in the approved drawing, the additional excavated

volume should be filled in with 1:3:6 mixture concrete at Bidders cost in respect

of materials, labours etc.

1.2 In case of rock soil, the extra excavated rock portion on all sides shall be filled

with 1:1.5:3 mix concrete at his own cost in respect of materials, labours etc.

4.3 The rates indicated in schedule for excavation work in each soil shall be

applicable to all the locations as per actual condition of the soil strata

irrespective of classification of type of foundation.

4.4 The rates for excavation indicated in schedule shall also be applicable for

benching work, if required.

5.0 SHORING, SHUTTERING AND DEWATERING :

The Bidder has to arrange for shoring, shuttering and dewatering work during

activities of excavation, stub setting and concreting. These shall be done at his

6.0 STUB SETTING:

5.1 The rates for stub setting are inclusive of cutting of stubs (if any), setting of

stubs, leveling at correct level, dismantling of template after concrete, back-

filling work etc.

6.2. Above rates shall be on per MT basis for normal, extensions up to 21 meters

and special/river crossing towers.

6.3. The weights payable for stub-setting item shall comprise of the weight of stub

and its respective stub setting template as per approved bill of material.

7.1. The rates indicated in schedule for concrete work shall be applicable to all the

locations irrespective of soil strata and type of foundation adopted. The Bidder

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

shall have to procure cement from the open market according to line

requirement and keep sufficient quantities to avoid delay in work. Same quantity

of cement is to be utilized from his own stock. Account of cement utilized at

each location duly certified by concerned GETCO supervisor and engineer in

charge of work, is required to be maintained and submitted with each R.A Bill.

No wastage is permitted as same is to be procured by the Bidder of brand

approved by the GETCO at his own cost from the authorized dealer.

7.2 Use of Cement :

The rates in Schedule-‘B’ are inclusive of cement cost. Bidder has to purchase

fresh 43 grade cement confirming to IS:8112 and brand approved by GETCO.

Bidder has to construct pucca godown at site of work so that cement bags can

be properly preserved to avoid damage due to any kind of water and moisture.

Bidder has to bring sufficient quantities of cement bags and at no time less then

200 (Two hundred) bags to maintain progress of work. The work should not

suffer for want of cement. It is full responsibility of Bidder to bring sufficient

cement at site at right time. Cement should give the required strength of cement

concrete. Bidder has to submit material account for consumption of cement

used with every bill. In case of non submission of the same, bill will not be

passed. Bidder has to submit the copy of cement purchased bill along with each

RA Bill/Final Bill.

Nothing will be paid extra for over consumption. Bidder is fully responsible for

safety of cement at site. If GETCO authorized representative desires to check

cement stock at site, Bidder has to allow him at any time. Bidder has to maintain

day to day cement consumption/balance account at site. As far as possible,

Bidder has to maintain supply of cement of only one brand & grade through out

the work and on account of closer/shortage of approved brand, cement of other

brand in accordance of condition no. (1) will be allowed by Engineer-In-Charge.

Minimum cement consumption considered for nominal mix cement concrete will

be as follows:-

a. 1:1.5:3 - 8.12 Bags per CMT

b. 1:2:4 - 6.5 Bags per CMT

c. 1:3:6 - 4.5 Bags per CMT

d. 1:4:8 - 3.5 Bags per CMT

In respect of pile foundation, GETCO reserves the right to adopt design mix and

same will be indicated in BOQ of bidding document.

Bidder has to use minimum cement as above. Bidder should not use less than

the prescribed quantities of cement.

Bidder will be allowed to carry out work only after physical verification of cement

available at site .

7.3 The GETCO reserves the right to test the quality of steel and cement procured

by the Bidder at any Government recognized laboratory and the test results

shall be binding to the Bidder. If the test results are not found satisfactory the

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

entire lot supplied and work executed has to be replaced / re-executed by the

Bidder at no extra cost to the GETCO.

7.4 Back filling of the excavated soil is to be arranged by the successful bidder. For

back filling if borrowed earth is required, the same should be arranged of

suitable quality and quantity irrespective of site condition at no extra cost to the

7.5 The sand shall be the best quality containing hard siliceous materials, clean and

of sharp angular grit type and free from earth or organic matter or salts and to

the satisfaction of the Engineer in-charge. The sand shall be washed before

use. No saltiest or brackish water shall be used for concreting.

7.6 The mixture of concrete to be used shall be such as to produce a sound,

compact and water-proof concrete. The mixture shall not be weaker than the

ratio to be prepared. The concrete for chimney shall be prepared with 20 mm

stone metal and the concrete for pyramid/step/pad shall be prepared with

mm or 40 mm stone metal. The mixture shall be prepared using mixing machine

only. It should also be free from grit and dirt. The concrete shall be mixed as stiff

as required for placing the concrete in the form of moulds with ease and degree

to which concrete resists segregation will permit. Hence, the quantity of water

used should not be too much.

7.7 Proper form boxes or moulds adequately braced to retain proper shape while

concreting should be used for chimney, pyramid and slab portions & vibrator

machine shall be used at the time of concreting. Form boxes should be water

tight so as not to allow cement cream to come out leaving only sand and gully to

form honey combs in concrete. Form boxes should be cleaned and oiled before

using for concreting.

7.8 All sub-merged locations must be kept completely dewatered both during the

placing of concrete and for 24 hours after completion. There should be no

disturbance of concrete by water during this period.

7.9 Form boxes should not be removed before 24 hours, after concreting. Concrete

surfaces where required should be set right with rich cement and mortar after

removal of the forms.

7.10 The Chief Engineer (Projects) or Engineer appointed by him at his sole

discretion may uncover any cast foundation to find out the workmanship of

foundation. Bidder shall render necessary assistance during such fact finding

operation and shall comply the report of the investigating officer.

7.11 The Bidder will be responsible for constructing the foundations in accordance

with the design of each type of foundation supplied by the GETCO.

7.12 The payment of excavation will be limited to the volumes as per approved

excavation drawings even though the Bidder may excavate more for the sake of

his own convenience or for any reasons. If the excavated dimension/s is/are

more than the dimension/s shown In the approved drawing, the additional

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

excavated volume should be filled in with 1:3:6 mixture concrete at Bidders cost

in respect of materials, labours etc.

7.13 In case of rock soil, the extra excavated rock portion on all sides shall be filled

with 1:1.5:3 mix concrete at his own cost in respect of materials, labours etc.

7.14 The rates for excavation indicated in schedule shall also be applicable for

benching work, if required.

7.15 The tor / plain steel bars required for RCC type foundation shall be procured by

the successful Bidder in advance to avoid delay in the work.

7.16 No wastage is permitted for reinforcement steel, as the same is to be procured

by the Bidder at his own cost. Overlapping of reinforcement steel will be

permitted in line with provisions of IS:456. However separate approval of

modality shall be got approved from GETCO engineering department. However,

no payment shall be made for extra consumed reinforcement due to overlapping

7.17 GETCO reserves right to test the quality of steel and cement procured by the

Bidder at any Govt. recognized Laboratory and intended to be used for the

tower foundation works. The test results shall be binding to the Bidder and

8.0 [A] Classification of Soil.

Soil strata for adopting various types of foundations:

a) Normal Dry Soil:

The soil readily removable with ordinary spades and shovels viz. Murram,

hard murram etc. and to be used for location in normal dry cohesive or non

cohesive soils. If the black cotton soil is encountered up to 500 mm below

ground level, normal dry soil foundation shall have to be adopted. (The

normal dry soil foundation designs shall be inclusive of this stipulation)

b) Sandy dry soil:

To be used for locations where cohesion less pure sand or negligible

cohesive sand mixed with soil are met in dry condition

c) Sandy wet soil:

To be used in location where water table is met from top

d) Fully submerged black cotton Soil.

To be used at locations where soil is clay type, not necessarily black in color,

which shrinks when dry and swells when wet, resulting in differential

movement extending to a max., depth of 3.5 meter below ground level. For

designing foundation for this location the soil is to be considered submerged

in nature. If the black cotton soil is encountered only up to 500 mm from

ground level, normal dry soil foundation shall be adopted. (This foundation

design shall be inclusive of this stipulation).

To be used at locations where decomposed or fissured rock, hard gravel,

kankar, lime stone, laterite or any other soil of similar nature is met.

Undercut type foundation is to be used for soft rock locations.

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GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

To be used at locations where chiseling, drilling, and blasting is required.

g) Fully submerged soil:

To be used at locations where sub soil water table is met at less than

meter below ground level and up to complete depth of foundation.

h) Partially submerged soil:

To be used at the locations where the submerged soil water table is met at

1.5m or more than 1.5 m below the ground level, the top portion of the strata

being normal dry soil.

8.0 [B] GEOTECHNICAL INVESTIGATIONS & PARAMETERS:

The geotechnical investigation shall be carried out by Bidder, with no extra cost

to GETCO, for assessing bearing capacity and settlement characteristic of soil

determining shrinkage and swelling properties, suitable type, size of foundation

and foundation levels for 66/132/220/400KV Transmission tower at following

locations due to special conditions/situations. The scope of work under this

contract shall include but not limited to following.

1. For Marshy soil/Fully submerged black cotton soil conditions.

2. For filled up soil.

3. For river crossing/creek area crossing/pond crossing.

4. Special Requirement as per approved profile.

Geo technical investigation shall be carried out through GETCO approved

laboratory/agencies only and depth of bore hole shall be 15 meter/30 meter/40

meter depending on site requirement/line profile as approved by GETCO.

The boreholes shall be backfilled by the Bidder after completion of investigation

work. The entire work shall be carried out as per relevant Indian Standard

Specification. Every undisturbed Sample (UDS) and disturbed sample (DS)

collected from the boreholes shall include but not limited to the following series of

 Tests: Applicable to

 Natural moisture content: UDS

 Atterberg limit: UDS & DS

 Sieve analysis: UDS & DS

 Unit weight: UDS

 Specific gravity determination: UDS & DS

 Unconfined compression test: UDS

 Unconsolidated undrained triaxial strength: UDS

 Consolidation test: UDS

9.0 Curing and back-filling :

9.1 After 24 hours of pouring, the concrete should be cured by keeping it

continuously wet for 14 days. After 48 hours of pouring, the pit may be backfilled

with excavated selected earth (which is free from grass, dung, wooden waste,

postures and fodder woods, shrubs, thorn etc.) sprinkled with necessary amount

of water and well compressed and consolidated in layers not exceeding

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

mm. If the excavated soil consists of large boulders/stone, the same shall be

broken to maximum size 80 mm and mixed with soil to be back filled. At the

locations where borrowed earth is required for back filling, this shall be done by

the Bidder at his own cost, irrespective of transportation from any land.

Thereafter, the exposed top end fill shall be kept wet for the remainder of above

prescribed curing period. The uncovered portion of concrete chimney above the

back filled earth shall be kept wet by providing empty gunny bags fully wrapped

around the concrete chimney for curing and ensure that the bags are kept wet

by frequent pouring of water on them.

9.2 Extra ordinary care shall be taken during back filling. The Bidder and GETCO

Engineer at site shall ensure that the back filling is done in the manner referred

above so that back-filled earth become homogeneous with surrounding parent

soil with the passage of time. The record for the same with day/date of curing,

back filling etc be maintained in the register and duly signed by the Bidder and

GETCO representative. The quantities of excavated earth obtained from a

particular location shall be generally utilized in back filling work in protection of

tower footing of same location unless it is unsuitable for such purpose. In the

later case, the back filling shall be done with borrowed earth of suitable quality

irrespective of land and the consolidation of earth shall also be done free of

9.3 The rates of stub setting are including the work of back filling of excavated pit.

The large stones / boulders shall be broken to maximum 80 mm size before

used for back-filling at no extra cost to the GETCO.

10.0 PROTECTION OF TOWER FOOTING :

Quantities of various protection works like stone revetment, concrete revetment, brick

masonry and random stone masonry to the foundations are to be executed by the

successful Bidder if indicated in the schedule and payment for such quantity shall be

as per unit rates accepted.

11.0 TOWER ERECTION AND GROUNDING:

( a) ERECTION OF TOWERS:

11.1 The super-structure of towers should be erected on foundations after

days of concreting. However, the method adopted for erection of tower is left

to the discretion of the Bidder subject to the condition that he takes

responsibility for any damage to materials. No tower member should get

strained or bent during erection. The towers must be truly vertical after

erection and no straining would be allowed to bring it in alignment. Maximum

tolerance in verticality that will be permitted is ONE mm per 360mm of tower

height. The bolt head shall be on outside faces and nuts and washers on

inside faces of the tower. All bolts & nuts shall be made fully tight and finally

the bolt threads shall be centre punched to avoid nuts getting loose.

Punching of bolts shall be made by chamfering the threads with centre

punch at least at three places equally spaced on contact surface of bolts and

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

11.2 Complete tower erection shall include erection of all accessories like danger

board, number plate, phase plate, C.I. Plate, Anti-climbing devices and

fittings including attachments like step bolts, ladders, platforms, 'U' bolts,

shackles, hangers, strain plates etc.

11.3 Suitable tower extension shall be erected to get desired ground clearance

whenever required, as determined at the time of survey and profiles.

11.4 To avoid pilferage of bolts and nuts and tower members, the bolts of the two

bottoms most panels (up to 10 meters) shall be tack welded at three places

on the nuts diametrically. The zinc rich paint shall be procured by the Bidder

at his own cost and shall be applied immediately following the tack welding.

11.5 The Bidder shall measure the tower footing resistance of each tower after it

has been erected and before stringing of the earth wire during dry weather.

Each tower shall be earthed; the tower footing resistance shall not exceed

ohms. Pipe type and counter poise type earthing which ever required shall

be done in accordance with the latest edition and revision of IS : 3043 (

code of practice for earthing ).The Bidder shall measure the footing

resistance of each location and prepare the record for submission and

approval of Engineer-in-Charge for deciding the type of grounding to be

11.6 Pipe Type Earthing :

At locations where footing resistance does not exceed 10 Ohms., the pipe

type earthing as per appended drawing shall be provided. The Bidder will

have to supply all the materials required for grounding like pipe, flat, bolt-

nuts, salt, fine broken coke/charcoal etc. The earthing is to be done by

making a bore hole for insertion of pipe away from the tower leg excavation

line as per attached drawings.

11.7 Counterpoise Earthing :

At locations, where footing resistance exceeds 10 Ohms, counterpoise

earthing as per appended drawing shall be provided to bring down the tower

footing resistance below 10 Ohms. The Bidder will have to supply all the

materials required for grounding like lugs, G.I. wire, bolts, nuts etc. The

counterpoise earthing shall be buried 1000 mm below ground level.

11.8 The method for providing earthing shall be at the desecration of the Bidder.

11.9 The rates for erection of structure of tower and extension up to 21 meters

and special / river crossing tower on special foundation/pile foundation

carried out by Bidder shall be on per MT basis. These rates shall be valid

irrespective of location, nature and specification.

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

11.10 The payment for superstructure / extension / special or river crossing tower

shall be made only after erection of complete tower as per structural

11.11 The rates for fixing of anti-climbing devices, danger board, number plate,

phase plate, circuit identification plate shall be inclusive of all materials and

11.12 The rates for providing earthing to the tower either pipe or counter poise

type inclusive of supply of complete earthing set, coke, charcoal, salt etc.

including required bolt nuts as per approved drawing all materials and

11.13 The Bidder shall arrange for all the equipments for tack-welding purpose. The

rates shall be inclusive of supply and application of zinc rich paint on it.

11.14 The Bidder shall arrange required equipments for measurement of soil and

tower footing resistance of each location, the tower footing resistance shall

be less than 10 Ohms and submit the joint measurement record of same

jointly signed by Bidder and Engineer in charge of line with final bill. The

payment shall be released only after receipt of final soil resistance details on

providing earthing at each location.

12.0 INSULATOR HOISTING:

12.1 Suspension silicone rubber insulator/ Anti-Fog Disc Insulator/Plain Disc

Insulator shall be used on all tangent type towers and tension silicone rubber

insulator/ Anti-Fog Disc Insulator/Plain Disc Insulator on all small, medium,

large angle and dead end type tension towers.

13.0 STRINGING :-

The stringing work should be carried with the help of tensioner and puller

machine or Manual.

13.1 The rates for any type of stringing work, out of followings are indicated in

i) Stringing of one ground wire,

ii) Stringing of single / double circuit line.

iii) Hot-line stringing of conductor

iv) LILO arrangement

13.2 The rates for stringing of conductors and ground wire for special crossings

like river shall be on per KM basis only and shall be paid according to actual

work done. In case special towers are suspension type, the special shall

mean major river crossing section considering the span from one anchor

tower to the other end anchor tower. If the special towers are tension type,

the special crossing shall mean span from special tower to special tower of

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

13.3 The stringing work should be planned in such a manner in consultation with

the Engineer in charge of the work that minimum shut down of power line

crossings are required. Revenue loss due to any undue shut down i.e. after

the shut down is arranged and required to be extended on account of Bidder

shall be recoverable from the Bidder.

13.4 Before commencing of stringing work, Bidder must obtain approval of sag

tension charts (these shall have to be supplied by the Bidder) showing final

sag and tension for various temperature and spans. The stringing chart shall

be prepared according to appended format only.

13.5 The Bidder shall be responsible and will take care of proper handling of

Conductor drums. Sufficient numbers of aluminum snatch blocks shall be

used for paying out the ACSR Conductor. Necessary precautions shall be

taken to avoid conductor rubbing on the ground by providing adequate

ground roller, rollers on supports. Additional rollers shall also be provided to

cross thorny hedges, footing and other obstructions to avoid scratching of

conductor. The conductor and ground wire shall be made to sag correctly as

per stringing charts, before they are finally transferred to the hardwares for

conductors and to clamps for ground wire. No joint should be made at less

than 30 metres from the tower end and no joint shall be permitted in Railway,

River, road and other important crossings spans. There shall not be more

than one joint in a span of each conductor. The sag shall be adjusted to suit

the sag indicated against actual temperature for an individual span. The

thermometer shall be provided at the conductor point during the stringing

work. Dynamometers shall be used in tensioning the conductors. All

conductors shall be stressed to their maximum working load at the time of

stringing, as per approved stringing charts.

13.6 The minimum clearance between the lowest point of conductor and ground

shall not be less than required. All compression joints should be carefully

made and a record of initial and final lengths of the joints jointly signed by

Bidder's and GETCO representatives shall be maintained. Check for sag

should also be made at intervals when conductors are drawn up. Over

stressing, causing damage to towers, should be avoided. Care should be

exercised not to over tension the conductor. An extra sag of 150 mm be

allowed at all the important tension locations like Railway/River Crossings.

For stringing of bundle conductor on line, the Bidder shall use only tension

stringing equipment. The earth wire may be strung by conventional method

and tension stringing equipments may not be used. The Bidder shall ensure

that the stringing gadgets are not anchored to the tower footing.

Each phase conductor shall consist of one conductor ( ACSR Dog/Panther)

the ground wire shall be 7/3.15mm galvanized steel wire.

To avoid contact with the ground or any object above ground level the

conductor shall be pulled by the controlled tension methods using neoprene

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

lined double pulled wheel type tension stringing equipments. The

equipments shall be capable of maintaining continuous tension of not less

than of 5000 kg. which shall be such that the conductor is maintained about

20% grater than the sags specified in the correspondence stringing sag

13.7 After being pulled the conductor/ground wire shall not be allowed to hang in

the stringing sheaves for more than 72 hours, before being pulled to the

specified sag. During the time the conductor / ground wire is on the stringing

sheaves before sagging-in, it shall be ensured that the conductor / ground

wire is not damaged due to wind, vibration, vehicles or other causes.

Scaffolding should be used to cross the important roads and Railway

Crossing for minimum interruption to traffic.

13.8 The conductor shall be pulled up to desired sag and left in serial stringing

sheaves for at least one hour after which the sag shall be rechecked and

adjusted, if necessary, before clipping in and transferring the conductors

from the serial stringing sheaves to the suspension clamps.

13.9 Conductor shall be clamped within 24 hours of sagging. The sag will be

checked in the larger spans of the section in case of sections up to eight

spans and in one intermediate larger span also for section with more than

13.10 The stringing sheaves, when suspended on the transmission structure for

sagging, shall be so adjusted that the conductor will be on the sheaves at the

same height as the suspension clamp to which it is to be secured.

13.11 The stringing of the ground wire shall be done in accordance with the

stringing charts approved by the GETCO. The ground wire of galvanized

steel shall be strung to run continuously over the conductors. The ground

wire shall be pulled, sagged and clamped-in from tension tower to tension

tower before the phase conductors are pulled in that section.

13.12 All the line conductors shall be terminated at sub-station structures whose

details shall be furnished by the GETCO at the appropriate time. The

contractor shall fix strain insulators on the sub-station structures.

13.13 Armour rods and vibration dampers shall be fitted at each suspension tower

before final clamping of conductor with Insulator strings. Vibration damper

shall be fitted at each tension tower after final clamping of conductor with

insulator strings. Vibration dampers are to be fixed using aluminum tape with

each clamping bolt and in correct vertical position in relation to conductor.

Compression type joints are to be used for jointing of conductors. Each part

connected with joints shall be perfectly cleaned by wire brush and properly

greased before final compression. All the joints of conductors and earth wire

shall be made with the best workmanship and shall be perfectly straight and

having maximum possible strength.

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

13.14 Proper guys shall be provided to counter balance the paying out tension of

conductor/ground wire at the tension locations, to avoid damage to towers

and/or accident.

13.15 Stringing work shall mean, the activities of fixing of insulator and insulator

hardwares, paying, jointing, tensioning, clamping with armour-rod, providing

dampers, repairing of conductors (if any) and fixing the conductor at tension

14.0 FIELD QUALITY PLAN

14.1 Bidder shall invariably submit the FQP along with Technical Bid for erection of

line including all the activities such as excavation, concreting, erection,

stringing etc. with detailed check list to be referred

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

TECHNICAL DETAILS FOR ERECTION &

COMMISSIONING OF TRANSMISSION LINE

survey & check survey :-

The Bidder has to carry out check survey, profile using modern technique as per

the complete BOQ given in this section. If any minor modification in alignment of

route, during check survey or while scrutiny of check survey is required, the

same shall be carried out by the Bidder at no extra cost to the GETCO.

2. RIGHT OF WAY, WAY LEAVE, TREE CUTTING AND OTHER

The successful bidder shall follow the ROW guideline issued by Govt. of

Gujarat through Tharav No. GET-11-2015-GoI-199-K dated 14.08.2017 (copy

attached) for Right of Way / Way Leave Clearance / Tree-crop Damages

etc. during construction of transmission line.

2.1 All statutory clearances and permissions from various statutory bodies/Govt.

authorities like Forest Department, Railway, Aviation Authority, Maritime Board,

National Highway Authority, etc. wherever required GETCO will co-ordinate,

along the entire route of the Transmission line, however the complete

responsibility lies with the contractor for submission of the required details,

follow up with statutory bodies etc. for obtaining the approval.

2.2 For necessary forest clearance, the GETCO will do the processing and the

payment to the central government/state government for compensation of forest

clearance will be paid by the GETCO as necessary. For permission from other

Govt. authorities like railway, National highway, State Highway, GIDC, GMDC,

Maritime Board, Gas or Oil Pipeline, Aviation Authority, Police protection, State

Reserve Police(SRP), legal matters etc. the payment shall be made by the

2.3 For clearances, permissions etc. from various authorities, the Bidder shall not

remain contended by simply informing the GETCO, but shall have to arrange for

personal follow up to overcome the difficulties in the interest of progress of the

2.4. The Bidder shall instruct his labours and staff to use minimum area while

executing the work where there are standing crops. No persons of the Bidder

should pick up any items from the standing crops or fruit. The Bidder should

take all possible steps to avoid or minimize damages to the standing crops. On

completion of the work, bidder shall make the surrounding soil to its original

2.5. For clearance of way leave permission/obstruction etc., as per GoG Tharav No.

GET-11-2015-GoI-199-K dated 14.08.2017 the Bidder is solely responsible

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

including any payments required to be made thereof including that for crop /tree

The bidder shall be responsible for mapping the route and location of

towers with Survey No. of land on Tikka Map and name of the land owner

from Revenue records (7/12). Based on these data, Notice shall be issued

by GETCO to respective land owners for tower erection works as per the

Circular No. GETCO/CE(P)/LO/Circular/2882 dated 21.07.2011.

2.6 Removing of trees, tree cutting and crop/ tree compensation thereof shall be

organized and paid by the Bidder as per GoG Tharav No. GET-11-2015-GoI-

199-K dated 14.08.2017. The cost of cutting the trees shall also be borne by the

Bidder. GETCO’s field officer shall render necessary helps for fixing the

compensation through concerned Department or other local revenue authority

like Talati-Mantri, Sarpanch / Mamlatdar. Such Payments are to be given

immediately after foundation, tower erection and stringing stages and

recorded in the ‘Panch Nama’. The amount to be paid shall also be informed

to the GETCO’s field officer not below the rank of Executive Engineer in charge

of work, however bidder should not claim for the delay in work on account of the

above. The record register of location wise payment shall be maintained.

2.7 It is the Bidder’s responsibility to take appropriate action for way leave etc. as

indicated above well in advance so that objections from the land owners

could be addressed well in time. In the event of any objection from land

owners, work shall be carried out by taking a order from District

Magistrate location wise. This order of District Magistrate shall also cover

provision of police protection and SRP. Circular No.

GETCO/MD/CE(P)/LO/Circular/22 dated 09.07.2013 of Managing Director,

GETCO is to be strictly followed. As per this, State Police or SRP

protection for any activity of transmission line is to be sought only after

permission from District Magistrate in all such cases wherever and

whenever objection is raised by land owner for laying of transmission line

3.0 TESTING AND COMMISSIONING:

3.1 The Bidder after completion of erection work will ensure that all works

connected with line have been completed. These works shall be done correctly

as per Indian Electricity Rules and Procedures. Any extra cost involved due to

incompleteness of work or bad workmanship found out subsequently shall be

set right forthwith by the Bidder at his own cost.

3.2 After the erection is complete in all respects, the line should be thoroughly

patrolled and checked for continuity and clearances. The line should be

meggered to check its insulation level. A written confirmation should be given to

the Engineer-in-Charge that, the men, materials, tools and earthings (if any) are

removed and the line is safe for charging. On charging the line, if it does not

stand and trips, the Bidder should arrange to patrol the line and find out the

causes of the tripping and rectify the defect at no extra cost to the GETCO.

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

4.0 HANDING OVER OF LINE DOCUMENTS:

4.1 On completion of all erection activities, the Bidder has to furnish following

information along with technical details to concerned Engineer-in-Charge of the

work in triplicate duly bound:-

1) Approved surveyed route with permanent marks, (To be obtained

from the GETCO)

2) Approved copy of profiles with tower schedule, (To be obtained from

the GETCO except for portion where any change is approved)

3) Location wise soil strata details of each pit excavated, type of

foundation executed, volumes of excavation & concrete and RCC

4) Details of revetment, retaining walls, etc., work done for protection of

tower footing and their approved drawing copies,

5) Approved copies of excavation plan and foundation drawings, (To be

obtained from the GETCO)

6) Approved copies of structural drawings of stubs, templates, towers,

extensions, etc., (To be obtained from the GETCO)

7) Approved copies of stringing charts,

8) Value of tower footing resistance jointly measured before & after

providing earthing and type of earthing executed, duly signed by

Engineer Incharge of line.

9) Details of spans and phase where mid span joint, repair sleeve are

10) Location wise type and numbers of insulators, insulator hardwares,

earth wire hardware, conductor accessories, provided, etc.

11) Separate detail of each crossing like road, river, railway, power line,

etc and details of clearance as per Indian Electricity Rules.

5.1 The Bidder shall ensure that at the end of each sub-activity the surplus material

is immediately removed from the work-site to avoid loss and injury to the public.

5.2 The Bidder has to make reconciliation of material account and to settle final bill

including signature in all relevant papers required for passing of final bill within

three months from the date of charging / commissioning of line.

5.3 A lump sum amount of 6 % of the order value OR Rs.1.0 lac whichever is less,

will be with held from the running bills of stringing work, which will be released

only after handing over of these documents to the satisfaction of concerned

Superintending. Engineer (Trans).

Note: The weights of tower extensions above 6 Mtr. are taken tentative. The

successful Bidder has to design the extension above 6 Mtr. and should be

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

got approved by GETCO with no extra cost. The payment of the extension

above 6 Mtr. will be paid as per the BOM approved by GETCO.

SEAL AND SIGNATURE

GETCO/E/TS SEL054/66DCP-P&D/W&WOC/ R1 Dt. March-2022

INDEX FOR FILES CONTAINING DRAWINGS AND

Sr. No. Description

1. Tower Material Specification

2. ACSR DOG/Panther conductor specification ( As per scope)

3. Earth & stay wire specification

4. Insulators specification

5. ACSR H/W & Accessories specification ( As per type of conductor

Dog/Panther & scope)

Drawings of H/W & Accessories (As per requirement)

6. 66kV Single suspension H/W

7. 66kV Double suspension H/W

8. 66kV Single tension H/W

9. 66kV Double tension H/W

10. Preformed Armour rod suitable for ACSR conductor

11. Vibration damper- 4R for ACSR conductor

12. Tubular Repair Sleeve

13. Tubular Compression Joint

14. Earth wire accessories 7/3.15

15. Tension Clamp Suitable for 7 3.15 MM Earth Wire

16. Suspension Clamp for Earth Wire

17. Mid span Compression Joint for Earth Wire

18. Cross by Clips for Earth Wire

19. Tinned Copper Earth Bond

20. Tower Earthing drawing 1 of

21. Tower Earthing drawing 2 of

23. Tower Earthing drawing 3 of

24. Supply & Erection - Specification

NOTE: The entire part-II (Technical Specifications) should be down loaded and

submitted with Technical Bid duly signed by the Bidder and stamped with round

company stamp on every page.

SEAL AND SIGNATURE