London Underground and Bridge Jacking Works

London Underground and Bridge Jacking Works

Hydra-Capsule are proud to announce completion of numerous flat jacks, hydraulic jacking and temporary propping support, real-time structural monitoring projects within the London Underground project and redevelopment programme.

www.hydra-capsule.com/flat-jacks

All our technicians and engineers are fully certified with the necessary LUCAS and PTS assessment cards to be able to mobilise and carry out works in accordance to all the recent guidelines.

All our projects and systems have been developed in-house and to the highest quality of systems to suit the high demand and critical operations.

Recent projects below:

- Baker Street, London LUL
- Gloucester Road, London - Structural Jacking
- Sloan Square LUL
- Latimer Road - Bridge Jacking
- King Cross Station - Slab Jacking

Bridge Jacking and Structural Monitoring

A14 Huntingdon Bridge Viaduct Strengthening

Hydra-Capsule have recently completed a major synchronised bridge jacking and grout bags works for the viaduct half joint strengthening. The project involved working with the Highway Agency and Network Rail hand-in-hand due to the unusual bridge structures.

The A14 bridge viaduct was part of the A14 Ellington to Fen Ditton major improvement scheme, but due to the ongoing deterioration of the half joints on the central span of the bridge, without intervention, the bridge would be incapable of of carrying the type and volume of traffic that uses the A14. were becoming deterioration carrying the type and volume of

traffic that uses the A14.

Hydra-Capsule were appointed to design and manufacture 84 number bridge jacking 50 tons capacity screwed ram locking collar hydraulic jacks. All were manufactured in the United Kingdom and to EN BS ISO 9001:2008. In additional, these jacks were interlinked and energised by Hydra Capsule’s synchronised hydraulic jacking system. Which allowed all jacks to be individually controlled by our own computerised system, using precise load and movement displacement (LVDTs) real time monitoring units at each installed strengthening beam position.

 

Once the defined loads and displacement was achieved, all the hydraulic jacks were mechanically “locked-off” by the screw-ram locking collar.

Once completed, Hydra Capsule installed custom-made grout bags which were inserted at each bearing location and inflated by our grout pump, to wedge the gap. Once the grout bags had cured and reached the specification compressive strength, the hydraulic jacks were energised, locking collars untightened and all jacks loads were de-energised under

controlled pumping. Which transfused the loads into the newly installed elastomeric bearings.