Anti-vibration specialist, CMS Vibration Solutions, has provided a complete foundation isolation system for two apartment blocks located on a railway boundary in Cambridge. The three storey McGarrell Reilly Homes development required anti-vibration treatment to prevent ground borne vibrations generated by the nearby railway lines from entering the building structure.

Working with the project’s structural engineers, CMS Vibrations specified a combination of Regupol RAV300 and CMS ISOSheet materials to isolate the concrete foundations of the apartments. Civil engineering contractors for the project, Durman Stearn, then installed the anti-vibration materials in the foundation pits.

Available exclusively in the UK through CMS Vibrations, Regupol RAV300 is a high performance polyurethane bound rubber granulate material, with a natural frequency in the range of 8-12Hz. In total, 185m2 of 50mm thick Regupol RAV300 was installed under the foundations to eliminate structural noise and potential damage to the structure from the trains operating nearby.

To achieve complete isolation, Durman Stearn installed 560m2 of CMS ISOSheet on the sides of the foundations. A medium density closed cell structure foam, CMS ISOSheet provides a natural frequency ranging from 12Hz to 50Hz. Manufactured in a range of sheet sizes, the material is also suitable for lightweight base isolation.

When excavating the pits, Durman Stearn identified that the ground comprised sand and gravel rather than clay, resulting in a rough surface on the sides of the foundations. CMS Vibrations advised that by forming a flat surface using plywood, Regupol RAV300 and CMS ISOSheet could still be used on the foundation pit. Once the installation of the plywood and anti-vibration materials was complete, a damp proof membrane was applied and the concrete cast up to the floor level.

Garry Ford, company buyer, Durman Stearn, comments: “The flexibility of Regupol RAV300 and CMS ISOSheet meant we could easily overcome the unexpected complications of the ground composition. Once the sides of the foundation pit had been prepared with plywood, the installation of the anti-vibration treatments was really straightforward.”

The proven performance levels and adaptability of Regupol RAV300 and CMS ISOSheet has led to the specification of the materials for the second phase of the development.

Paul Lafone, director, CMS Vibrations, concludes: “Our broad portfolio of anti-vibration solutions enabled us to recommend the most cost effective combination of treatments for the first phase of the McGarrell Reilly Homes development. We were also on hand to provide top level advice on the installation challenges associated with the foundation pit.”

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