CIVIL DESIGN

CASE STUDIES

 

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NEW CABLE ROUTE AT WEST WEYBRIDGE

CLIENT

UK Network Power

CHALLENGE

• To design a new 2km, 132kV cable route from a substation to a switching station at West Weybridge, Surrey, passing under the M25, another major road, a canal and a railway
• To respect and balance the interests of multiple landowners and other stakeholders

SOLUTION

• To design three horizontal directional drills up to 22m deep and 300m long so that settlement under the roads, canal and railway was minimised within acceptable limits
• To reassure the client and stakeholders by including in the designs geotechnical analysis of the existing strata, predicted settlement calculations during and after drilling and devising a suitable monitoring regime
• To demonstrate capability and competence through multiple iterations within the design phase

RESULTS AND BENEFITS

• Designs approved by Network Rail, the Highways Agency and Surrey County Council
• A comprehensive detailed ‘buildable’ design approved by the client and backed by relevant reports and calculations
•Stakeholders could continue to use their land as normal as settlement was minimised

DIRECTIONAL DRILL NUMBERS

6

Lanes of M25 to drill under

1

Canal and Working Railway to drill under

22

Metres deep

300

Metres long

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