Prestressed concrete steel composite support relative to support more economic and environmental point in recycling of steel structure can be dismantled, compared with ordinary steel composite support, prestressed steel composite support need to release the prestressed before dismantling, Shanghai strong foundation prestressed steel belly type foundation pit support in ensuring construction quality under the condition of same, use less of steel members, It can provide more construction space, improve construction efficiency, shorten the construction period and reduce the cost.
The removal of the steel support of the prestressed fish-belly foundation pit is also different:
During the demolition, the partial deformation and cracking of the structure should be avoided due to excessive release of instant preloading stress. Firstly, the stress of the fish belly beam steel strand is released, and the release process requires the symmetrical operation as far as possible, which is conducive to the balance of the structure. The support (Angle support) adopts special jack to support the roof and appropriate force jacking, and then takes out the adjusting steel plate, and the jack gradually removes the force, and continues to remove the force after stopping for a period of time until the end.
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