A preview of the Bristol Carriageworks development
The redevelopment of the Carriageworks and Westmoreland House site in Bristol has moved forwards with the completion of the architectural and engineering pre-novation stage designs for the landmark Bristol development.
The site, bought by the PG Group in 2017, comprised an existing stone and cast iron building called the Carriageworks and a second building, made of reinforced concrete, called Westmoreland House, both in a very dilapidated and unsafe condition having lain empty and derelict for a number of years.
Clarkebond is providing civil, structural and ground engineering on the scheme where work to demolish Westmoreland House has started.
Demolition works will include the removal of foundations and a basement which will be filled with crushed and graded engineering specification demolition arisings below ground level and temporary works if required. The iconic Carriageworks building will be partially demolished with the distinguished stone arched façade being retained.
The new development will comprise 6 residential blocks, some including retail units, of differing sizes and construction types. Options being considered have included for three of the six buildings to be reinforced concrete, two to be timber structural insulated panels and the building behind the Carriageworks arches to be steel framed.
The site has a number of engineering challenges associated with the redevelopment of brownfield sites.
Clarkebond’s Ground Engineering team’s investigations confirmed legacy use of the site to include a carriage manufacturer, blacksmiths, foundry, a rubber works, garage and paint shop. Contamination by heavy metals, PAHs and Asbestos Containing Materials (ACM), was found, consistent with this previous usage. An outline Remediation and Risk Reduction Strategy was produced to address these risks, including that asbestos-impacted soils could safely remain on site, subject to remedial measures. Guidance on the waste disposal classification of asbestos-impacted soils, was also given.
An options appraisal for foundation types was undertaken to address the issues of buried basements, 2 m of made ground across a third of the site, site boundary retaining walls and the presence of a deep-lying strategic sewer running through the site.
Following demolition, a further phase of ground investigation will assess below ground party/boundary wall aspects and the large basement area of Westmorland House, followed by a final Remediation and Risk Reduction Strategy.
The designs have now been submitted for contractors’ proposals.
* Development preview: A short video produced by Clarkebond engineers gives a preview
s of what the development could look like.