Compared with the traditional steel composite bracing, the prestresstypeThe steel composite support improves the overall steel degree and stability of the support system, and improves the safety of the foundation pit support structure. Shanghai Strong foundationPrestressed fish belly typeThe foundation pit steel support technology adopts prestressed fish belly beam structure, which further reduces the number of steel members, provides open construction space, and makes excavation, transportation and underground structure construction more convenient.
The fish belly beam is applied with steel strandaddPrestressed:
①When the steel strand is installed, the left and right sides are symmetric.
②When tensioning the steel strand, check the tensioning and connecting parts (anchor bolts and bolt joints) before construction.
③When the steel strand is stretched, it should be carried out one by one, using batch overtensioning (press15%Overtension control),toThe overall uniform stress is formed.Avoid partial untensioning.
④Tension of steel strand is indicated first on the drawing50%and70%, and then load to100％Hold under tension load15Minutes, observe anchor head without displacement after locking load.
⑤The steel strandWhen the tensionElongation of steel strand, prestress,Steel strandTensioner and special casesIt has to be recorded and filed.
⑥In the design drawing, when the number of steel strands is odd, according to the design number of steel strands.The actual construction needs to increase the steel strand as a safety reserve.
⑦Steel strandinThe layout and installation sequence of components are shown in the following figure:
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