Scope of Works:

As part of the upgrade of the A465 Heads of the Valleys Trunk Road, various sections of the route between Merthyr Tydfil and Abergavenny needed to be converted from a three-lane carriageway to four-lane dual carriageway. As a result it is necessary to divert VS001 – Gilwern to Hafodyrynys 450mm Pipeline through Cwm Clydach gorge.

The pipeline was laid down the sides of the gorge and across the A465, Heads of Valley road. The tie-ins were carried out by means of a stopple and bypass arrangement.



Key Challenges 

  • Site Access

  • Existing Services (Major Water & Electric)

  • Topography & Ground Conditions

  • Culvert / River

  • Crossing A465

  • Restricted Working

  • Public Access & ROW

  • Under-pressure Connection Works (NRO)

 Heads of the Valley Diversion Photo 1

 Wales & West Project Management

  • Shaun Lawrence

  • Nigel Hodson

 Heads of the Valley Image 2

Project Stakeholders:

  • Welsh Assembly (End Client)

  • Road Scheme Contractors (Costain)

  • Environmental Bodies

  • 3rd Party Services

 Heads of the Valley Diversion Photo 3