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Donegan Civil Engineering

TBM Rail Crossing – Croes Atti, Flint

A 40m TBM drive beneath the Chester-Holyhead railway line in very wet clays with large boulders

By: Valentine Donegan

Published: August 6, 2026

TBM Rail Crossing - Croes Atti, Flint

Client: Costain / Welsh Water

Project Description / Main Operations

This project was carried out for Costain, on behalf of Welsh Water. A 1200mm internal diameter Iseki Super-Unclemole TBM undertook a 40m drive beneath the Chester-Holyhead railway line.

Scope and method:

A 40m drive beneath the Chester-Holyhead railway line using a 1200mm internal diameter Iseki Super-Unclemole TBM.
Sinking of a 6.00m diameter drive shaft, approx. 8m deep.
Sinking of a 4.00m diameter reception shaft, approx. 7m deep.
Both shafts constructed on either side of the Chester-Holyhead railway line in difficult ground conditions comprising very wet clays with large boulders.

For More Information, contact us at http://www.donegan.co.uk

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