CMS Vibration Solutions, the UK’s leading provider of specialist anti-vibration and structural isolation products, has designed, manufactured and installed a bespoke floating floor system for a new health centre located beneath the railway arches at Clapham Junction.

Designed to take pressure off local GP surgeries, the health centre had to be located in a high footfall area close to Clapham Junction station. As a densely populated location, the only available space for development was within five railway arches directly beneath the railway track beds. Planning conditions demanded that the vibrations generated from the passing trains be isolated and the area effectively damp proofed. To ensure the building was fit for purpose, a very low frequency solution was required that could deliver a constant natural frequency of 11Hz.

Considering the project constraints and performance requirements, CMS Vibrations undertook a value engineering exercise on behalf of main contractor, Osborne, which led to the bespoke design of Kinetics RIM-C system – a high performance acoustic floating floor. Adapting the standard build-up of the Kinetics RIM-C, this unique system decoupled the health centre from each of the five railway arches and facilitated the installation of a French drain to tackle damp issues.

The Kinetics RIM-C (Rollout Isolation Material) acoustic floating floor was selected as the system of choice based on its excellent airborne and impact noise ratings, which are achieved by ‘floating’ the concrete floor slab and creating an air void between it and the vibrating structure. As well as specifying and supplying the Kinetics RIM-C system at the health centre, CMS Vibrations was also contracted by Osborne to manage the installation.

Neil Mitchell, surveyor, Osborne comments: “The Kinetics RIM-C system met all of our requirements in terms of cost and high performance but due to the bespoke nature of the system we commissioned CMS Vibrations to handle the install. The specialist end-to-end service that CMS Vibrations provided was impressive; from the level of technical advice they provided to ensure the correct initial specification, to the site visit the team undertook to fully understand the project requirements. At the point of installation extremely tight timescales were imposed but CMS Vibrations were able to complete the work within four days, which meant there was no impact on the overall build programme.”

A total area of 308m² was isolated using the Kinetics RIM-C system. This was constructed by first positioning 1500 KIPs (Kinetics Isolation Pads) at predetermined centres on the slab. The remaining floor area was then covered with a layer of ‘CMS Quiet Slab’ mineral wool board. A watertight formwork was created using plywood and damp proof membrane on top of the KIP isolators, with a removable formwork around the perimeter. After casting the slab the perimeter formwork was then removed to create a ‘French Drain’.

Critical to the performance of Kinetics RIM-C system are the KIPs, as these precompressed fibreglass isolators maintain a constant natural frequency over a wide range of static and dynamic loads. Moreover, there is no appreciable degradation in the isolation performance during the projected lifetime of the floating floor.

Jim Herbert, Technical Sales Manager, CMS Vibrations, concludes: “Inner city developments in particular, are coming up against specialist vibration challenges with stringent performance requirements. By offering the flexibility of bespoke system design, manufacture and installation, we are well placed to support main contractors by providing the complete solution to meet specific project requirements.”

CMS Vibrations is the exclusive UK supply partner of the Kinetics Noise Control range in the UK.

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