1. Emergency plan for the horizontal displacement of the brace and Angle brace to the pit if it reaches or exceeds the alarm value: install jacks at the prestressing end of the brace and Angle brace, apply prestress in stages, and monitor the deformation until the deformation is stable.
Assembled steelsupportConstruction emergency plan:
1, the horizontal displacement of the Angle brace to the pit reaches or exceeds the alarm value
Emergency plan: in the right,gussetPrestressing end, installing jack.The prestress is applied in stages and the deformation is monitored until the deformation is stable.
2, the horizontal displacement of the fish belly beam to the pit reaches or exceeds the alarm value
Emergency plan:By putting the belly beam of the fishPrestressed strand and spareThe steel strand is carried outTension, againBy applying prestress, the deformation of the fish belly beam can be controlled and reducedThe effect of; The number of spare steel strands is not less than the total number of steel strands10%, should be tensioned one by one, tension for each130kNAt the same time, the deformation is monitored. When the deformation is stable, the prestress is stopped.
3, for,gussetThe horizontal displacement outside the pit reaches or exceeds the alarm value
Emergency plan: in the corresponding pair,gussetAt the applying end of prestress, install the jacking and pressing end, lower the amount of prestress, and extract the steel pad added during loading, whose thickness is determined by the value after monitoring the deformation stability, so as to control the outward deformation.
4, the axial stress of enclosing purlin of section steel reaches or exceeds the alarm value
Emergency plan: when the pressure of the enclosing purlin of the section is too large, add a longitudinal rib of channel steel in the compression section to increase the cross-section area of the enclosing purlin under compression, so as to reduce the compressive stress on the enclosing purlin; In the enclosing purlin of the steel section under pressure, fill the quick-setting and slightly expanded concrete,20Intensity produced in minutes; When the axial tensile stress around purlin of the beam is too large, add a steel plate at the beam joint and weld it with the beam at both ends of the joint to reduce the stress on the bolt.
5, alignment, Angle brace stress reaches or exceeds the alarm value
Emergency plan: when the monitoring shows that the stress is too large, the retaining wall at both ends of the opposite and Angle support should be piled with earth back pressure to reduce the pressure transmitted by the retaining wall, so as to reduce the supporting stress. The support should be added with more than one section steel to apportion the stress and reduce the supporting stress.
6, the connecting bolt is cut
Emergency plan: increase the number of connecting bolts at the cut place, or weld the connecting rod directly at the cut place.
7, local buckling of member joints
Emergency plan: increase the stiffening plate of the corresponding position member; Stiffening plate and member spot welding connection; Segmental welding.
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