1. Power Transmission & Distribution Project LARSEN & TOUBRO LIMITED ECC DIVISION
Front Page

2. 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)
Company Profile – ECC division

3. Project Overview
Generation
Transmission
Distribution
The following 765 kv transmission lines associated with Rihand-III & Vindhyachal –IV Transmission system includes two tower packages:-
Tower package- P219-TW Km Gwalior- Jaipur 765 kV S/C Transmission line, Part-I
Tower package- P219-TW Km
Gwalior- Jaipur 765 kV S/C Transmission line, Part-II

4. Salient Aspects of the Project
Name of the Project: 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:
End date:
Total Cost Of Contract : - Rs 78,04,62,752/- ( Rupees Seventy Eight Crore Four Lacks Sixty Two Thousand Seven Hundred Fifty Two Only)

5. Project Route Gwalior Gangapur Lalsot Kothun Phagi

6. 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.
Galvanisation-Galvanization (or galvanisation) is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting.

7. Different Tower Sections

8. Height Of A Transmission Tower
1. 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)

9. Classification of Towers
Type 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

10. 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.

11. Parts Of Transmission Tower

12. Work Methods www.engineersportal.in
Route alignment & Survey Soil Investigation Foundation Tower Erection Stringing Testing and commissioning

13. 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.

14. Role Of Soil For The Foundation
Normal Dry
Sandy Dry Soil
Wet
Nd-To be used for locations where normal dry cohesive or non-cohesive soils are met.
Sd-To be used for locations where cohesion less pure sand or sand with clay content less than 10% met in dry condition
Wt-Where sub-soil water is met between 1.5 meters and the depth of foundation below the ground level

15. Role Of Stringing www.engineersportal.in
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.

16. Types Of Insurance Required
Automobile
Third Party Liability
Liability Workmen’s Compensation
Marine insurance for supply Employer’s Liability Installation

17. 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.

18. Safety Statistics of June 2013
S.NO
DESCRIPTION
NUMBER
MAN-HOUR
OT PERFORMED
TOTAL 1
Company Staff 17
6052
Not Applicable 2
Departmental Workmen (including regular supply) 71
15336
9940
25276 3
Subcontractor's Workmen (including security personnel)
165
35640
23100
58740
Ot-Occupational therapy is skilled treatment that helps people become ... Goals
 use of treatments to develop, recover, or maintain the daily ..... Performance skills
GRAND TOTAL OF MANHOURS WORKED DURING THE MONTH
90068

19. 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
Mpcs-Under MPCS, various reports are maintained like
Cp-month wise target for each activity till completion and subsequently updating the actual accomplishments are listed
Inv- Listing of activities for Planned vs. Actual Billing done as per the volume of work Executed
Mil-critical activities comparing the planned vs. actual achievement.

20. Major Constraints For The Transmission Line Project
ROW Problems
Tree Cutting
Shut Downs
Row-right of way
Sd- railway crossings

21. Thank u