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Power Transmission & Distribution Project LARSEN & TOUBRO LIMITED
ECC DIVISION
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LARSEN & TOUBRO LIMITED
L&T was founded in Bombay (Mumbai) in 1938 by two Danish engineers, Henning Holck-Larsen and Soren Kristian Toubro.
L&T is a technology, engineering, construction, technology, manufacturing and financial services company.
In 1944, ECC was incorporated by the partners; the company at this time was focused on construction projects (Presently, ECC is the construction division of L&T)
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Project Overview
The following 765 kv transmission lines associated with Rihand-III & Vindhyachal –IV Transmission system includes two tower packages:-
Tower package- P219-TW11 150Km Gwalior- Jaipur 765 kV S/C Transmission line, Part-I
Tower package- P219-TW12 150Km
Gwalior- Jaipur 765 kV S/C Transmission line, Part-II
Generation
Transmission
Distribution
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Salient Aspects of the ProjectName of the Project: - 765 kV S/C Gwalior – Jaipur (PART-II) Transmission Line Project
Client: - PGCIL (Power Grid Corporation Of India Ltd., New Delhi)
Contractor:- M/S LARSEN & TOUBRO Ltd., Chennai
Project duration: - 24 Months
Start date: - 24-03-2011
End date: - 30-03-2013
Total Cost Of Contract : - Rs 78,04,62,752/- ( Rupees Seventy Eight Crore Four Lacks Sixty Two Thousand Seven Hundred
Fifty Two Only)
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Project Route
Gwalior
Gangapur
Lalsot
Kothun
Phagi
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Towers
The transmission towers are self –supporting hot dip galvanized lattice steel.
Type designed to carry the line conductors with necessary insulators, earth wires and all fittings
under all loading conditions.
The tower should be fully galvanized using mild steel or high tensile steel sections as specified. Bolts and
nuts with spring washer are to be used for connection.
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Different Tower Sections
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Height Of A Transmission Tower1. Minimum permissible ground clearance (H1)2. Maximum sag of the conductor (H2)
3. Vertical spacing between top and bottom conductors (H3)
4. Vertical clearance between ground wire and top conductor (H4)
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Classification of TowersType Of Tower Deviation Limit Typical Use
A 0 deg. To be used as suspension tower
B 0 deg.-15 deg. Tension tower for Earth wire.
C 15 deg.-30 deg. To be used as section tower & for transposition of transmission lines.
D 30 deg.-60 deg. Anchor tower for river crossing
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Purpose Of Using Different Tower
1. Tangent Suspension tower and it is generally A – type tower.2. Angle tower or tension tower or sometime it is called section tower. All B, C and D types of transmission towers come under this category.
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Parts Of Transmission Tower
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Work Methods
Route alignment & SurveySoil Investigation
FoundationTower Erection
StringingTesting and commissioning
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Role Of Route Alignment & Survey
The routing of the transmission line is most economical from the point of view of construction and maintaince. Thus optimal route should be used.
Routing of transmission line through protected/reserved forest area should be avoided.
The route should have minimum crossings of Major river, Railway lines, National/State highways.
The number of angle points should be minimum.
It is preferable to utilize level ground for the alignment.
Crossing of power lines should be minimum.
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Role Of Soil For The Foundation
Normal Dry
Sandy Dry SoilWet
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Role Of Stringing
1.The machine is suitable to string one rope or one
conductor.2.The bull-wheel grooves
are made up of high resistance interchangeable
nylon sectors.3.The machine is
completely electronically controlled.
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Types Of Insurance Required
Automobile Third Party Liability
Liability Workmen’s
Compensation
Marine insurance for
supply Employer’s
Liability Installation
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Safety Systems And Safety Indices
Objectives
Establish and define chain of command for resolution of all hazards prevention issues
Define individual hazards prevention and safety promotion responsibilities at each level of the construction team.
Identifying highly hazardous operations within the scope of work and specify integrated preventive measures to mitigate the same.
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Safety Statistics of June 2013S.NO DESCRIPTION NUMBER MAN-
HOUROT PERFORMED TOTAL
1 Company Staff 17 6052 Not Applicable 6052
2 Departmental Workmen (including regular supply)
71 15336 9940 25276
3 Subcontractor's Workmen (including security personnel)
165 35640 23100 58740
GRAND TOTAL OF MANHOURS WORKED DURING THE MONTH
90068
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MPCS and Reporting Systems
Schedule of Construction program
Schedule of Invoice
Schedule of Milestone events
Schedule of Plant & Machinery
Schedule of Staff
Schedule of labour
Schedule of Material requirements
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Major Constraints For The Transmission Line Project
ROW Problems
Tree Cutting
Shut Downs
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Thank u