Dinorwig – Timber Heading

Dinorwig

Written by

bubble design

Published on

29 July 2026

Introduction

Upon HBT site visit it soon became apparent why trenchless method was being looked at. There was a bank of cables which was encased in concrete above the proposed route.

HBT was appointed by Morgan Sindall, to undertake the temporary works design and construct a 3.2m long x 1.8m wide x 1.2m high timber heading.

No ground information was available at the time so HBT commenced the temporary works as the design works had to be based on Dry Clay

Timber Heading

The Challenge

During the works, granite boulders & high water was encountered so additional calculations had to undertaken to ensure that the temporary works was fit for purpose given the change in ground conditions as well as additional miners being utilised.

“This is why we use HBT for any specialist trenchless works absolutely great team and works undertaken with safety first”
- Morgan Sindall

“We have a great working relationship with Morgan Sindall but this was a very small job however just goes to show how quickly ground conditions can change.
- HBT

For more information on trenchless works please contact us on 0845 388 3325.

Case Studies

Related posts

Explore more case studies related to this post.

Bessacarr – Caisson Shafts & Augerbore

HBT undertook the design & build of the foul & storm pump stations & manholes to adoptable standards in accordance with Yorkshire Water requirements.

bubble design

A63 Hull – Augerboring

HB Tunnelling supported Balfour Beatty by installing a drainage pipe from the new underpass at the modified Mytongate Junction, linking it to the pump station shaft.

bubble design

Appleby Lodge – Guided Auger Boring

HB Tunnelling was approached by United Living Energy Ltd (ULEL) to help resolve a potential service clash during the installation of the Appleby Lodge Gas Pipeline.

bubble design