Penygawsi Primary School
DRILLING & GROUTING WORKS CREATE VALUE FOR EDUCATION PROJECT IN HISTORIC WELSH MINING REGION
Project Description
Data 472 drilling positions, 13,500m of drilling, 101m of steel casing, 385 tonnes of grout
Client Morgan Sindall Construction
Type of contract Design and build
Construction Period February – March 2023
The Rhondda Valley in Glamorgan in Wales was once one of the world’s most important coal mining regions. Between 1860 and 1939, the region boasted 79 collieries and levels, mining multiple coal seams across the area. This legacy poses a risk to contemporary development as some of the historic workings are unmapped and were abandoned in an unstable condition.
Aarsleff Ground Engineering were contracted by Morgan Sindall Construction in order to undertake a strict specification of drilling and grouting on a 3m grid across the site. The works included injection of grout into the boreholes to sufficiently fill all cavities, breaks, and fissures in and above the historic workings. This would minimise the risk of measurable subsidence, formation of surface crown holes, and potential damage to structures in the vicinity of the mine workings.
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