Structural Repair
Enquire:
www.dcep.co.uk Tel: 01630 673000 Fax: 01630 673247 Email:
info@directcontactexhibitions.com Post: use the Enquiry Sheet Innovative Bridge Grouting
Normet International (formally known as TAM) are a world leader in the manufacture of specialist chemicals, systems and machinery for underground construction, ground engineering, civil construction, and the general building industry. We are involved in many projects throughout the world and are well known for our leak sealing and waterproofing materials. This is why Camden Council and specialist contractor Tempo-PCE were happy to utilise our materials on the Kingsway Service Tunnel in Holborn, London.
Tempo PCE’s unique method has been used successfully on a series of projects, including culverts, bridges and tunnels. One of Tempo-PCE’s current sites is the Kingway Service Tunnel in Holborn, with the London Borough of Camden. LBC have been using low-pressure injection with a resin/cement mix since 2007 as part of a series of strengthening works to the service tunnel. The design brief here was to form a link between an existing concrete saddle and the tunnel’s brick rings. The link was formed effectively and the Consulting Engineer, Roughton UK Ltd, confirmed a live load increase from 17 tons to 44 tons (gvw).
Tempo-PCE developed a unique method of grout injection into masonry structures, combining the use of low-pressure with a blend of cement and resin.
Low-pressure injection avoids movement to the brickwork or backfill. It also assists absorption, as the injected material can easiily replace water or air in the structure. The grout replaces missing mortar, penetrates cracks, and fills any voids. Its inherent fluidity enables penetration into the masonry, and backfill where applicable.
The low-pressure approach allows work from underneaththe soffit, with the structure remaining in full use, offering a low impact alternative to conventional methods of repair, and making traffic management unnecessary.
Tempo-PCE’s specialist grout is a blend of acrylic resin, TamAcryl 2000 and micro-fine cement. The use of acrylic resin, rather than water, gives the grout a longer open-time, enabling additional absorption into the brickwork and an increased flexibility over a standard concrete mix. The blend also allows a reduction of probe diameter to as little as 10mm, enabling the retention of the visual appearance, eg. of a listed structure.
Low-pressure injection with a resin/cement blend can link delaminated brick rings, increase brick strength, and thicken arch barrels by penetrating the backfill. The process has been proven through site trial and independently shear tested by University College London.
www.normet.com Reader Enquiry: 71 0333 240 9966
Reader Enquiry: 72 46
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