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| PERGAU
H.E.P. - KELANTAN, MALAYSIA |
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STEEL
TUNNEL LINING (STL) OF 60 degree INCLINED SHAFT
WORKSCOPE
Detail engineering, supply, fabrication, installation,
and painting of approximately 350m of 5.0m dia. steel
tunnel lining (Quenched and Tempered), including 2 transition
sections and a rolling lobsterback bend.
| Project
Data |
| Location |
Kelantan,
Malaysia |
| Client |
Kerjaya
Balfour Beatty Cementation Sdn. Bhd. |
| Owner |
Tenaga
Nasional Berhad |
| Contract
Period |
1993-1996 |
| Contract
Value |
£5.5
million |
| Contract
Tonnage |
1320
te |
| Design
Code |
CECT,
BS5500 |
| Material
Specification |
Quenched
and Tempered with min.
UTS of 780 N/mm2 |
| Diameter
Range |
4.2m
to 6.0m |
| Thickness
Range |
16mm
to 35 mm |
| Post
Weld Heat Treatment |
None |
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| DESIGN
/ DRAWINGS |
The basic design was verified by our own engineers
and detailed design undertaken.
Permanent works drawings, including the development
and cutting arrangement drawings required for fabrication
were produced on Autocad.
Due to complexity of the access for installation
work, a disproportionate amount of design and drafting
work was necessary for the temporary works facilities.
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| METHODOLOGY |
The basic methodology devised at the tender stage
was developed further utilising computer graphics
to simulate the key areas of the installation works.
This enabled the project team to evaluate a number
of options quickly and accurately.
Temporary works equipment was designed and configured
to overcome the unique problems associated with
the project.
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| SITE
ESTABLISHMENT |
As it was not feasible to transport pre-fabricated
sections to the site location it was decided that
a purpose built facility would be established on
site.
An area of land was recovered from the rain forest
local to the Surge Shaft to accommodate our site
overall facilities.
It was determined that craneage cost savings could
be made if the fabrication facility was sited adjacent
to the access point (Surge Shaft) to allow the same
crane to be utilised for both purposes.
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| FABRICATION |
Foundations were laid and an 18m high open ended
fabrication shop was erected and fitted out with
a vertical plate rolling m/c, cutting tables, rotators,
automatic welding m/c's, preheat facilities, assembly
jigs, and access platforms. The Portal Crane rail
system ran through the workshop and over the Surge
Shaft.
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