In THE CONSTRUCTION of section steel combination support, in order to deal with all kinds of danger and emergency situations that may appear, control the expansion of the situation, reduce the loss of life and property of the country and the people, and ensure the smooth construction and production, it is necessary to establish and perfect various preplans, so as to achieve clear responsibilities, simple procedures, reasonable division of labor and sensitive response. The following is the emergency plan for the prestressed fish-belly foundation pit steel support of a project in Shanghai strong foundation.
(1)The horizontal displacement of the Angle brace to the pit reaches or exceeds the alarm value
Install a jack at the prestressing end of the Angle brace, apply the prestressing in stages, and monitor the deformation until the deformation is stable.
(2)The horizontal displacement of the fish belly beam to the pit reaches or exceeds the alarm value
The deformation of the fish belly beam can be controlled and reduced by tensioning the prestressed steel strand and the spare steel strand and then applying the prestress. The number of spare steel strands is the total number of steel strands10%, should be tensioned one by one, tension for each130KN At the same time, the deformation is monitored. When the deformation is stable, the prestress is stopped.
(3)The horizontal displacement of the Angle brace outside the pit reaches or exceeds the alarm value
Install the jacking pressure end at the prestressing end of the corresponding Angle brace, adjust the value of the prestressing pressure, and extract the steel pad added during loading. Its thickness is determined by the value after monitoring the deformation stability, so as to control the outward deformation.
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