Shanghai has a strong foundationPrestressed steel composite bracing A special fish-belly beam structure is used to reduce the use of steel components, significantly improve the working conditions of the underground space while ensuring the quality of construction, and reduce the cost of construction compared to traditional support techniques20%Above, the construction period of installation, demolition, excavation and underground structure is saved40% The above.

The fish belly beam uses steel strand to apply prestress. During the removal of the steel support,The prestress release and recovery of steel strand are emphasized, and the specific methods and requirements are as follows:

1,Demolition method

(1)First, a special sleeve is put into the anchor.

(2)Use the strand release to stretch the strand until the clamp in the anchor can be removed.

(3)Use the pointed pliers to separate the steel strand and the clamp in the anchor.

(4)Release the tension of the steel strand.

(5)After the clip of one section is recovered, the clip of the other end is recovered by the same method, and the steel strand is recovered.

2,Matters needing attention

(1)When the steel strand is recovered, it is not allowed to cut with oxygen acetylene.

(2)When removing the steel strand, use the steel strand release device as the principle. In special cases (such as when the steel strand release device cannot be used), use the cutting machine, cut and recycle.

(3)When using the steel strand release device, there should be no construction personnel in the direction of the steel strand, and the construction personnel must stand beside the steel strand to avoid the occurrence of clip injury.

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