2022 first-class construction engineer municipal forecast test point structural support system, one construction finishing point prediction, long press and like + forward + evaluation continue to be updated, click on my avatar and send a private message to me: 2022
the first support is designed as reinforced concrete support, and the second and third support are steel support.
Reason: The first support is located at the top of the foundation pit enclosure structure of , and the reinforced concrete support has high stiffness and small deformation; the side pressure of the soil at the second and third support positions is relatively small, and it can be turned around and used to reduce costs. The construction and demolition order of the internal support structure of
(1) should be consistent with the design working conditions, and the principle of supporting first and excavation must be adhered to.
(2) There is close contact between the surrounding purlin and the retaining structure, and no gaps shall be left. If there is a gap, use fine stone concrete with a strength not less than C30 to fill it with compactness or use other reliable connection measures.
(3) Steel support should apply prepressure according to the design requirements. When a loss in the support pressure is detected, the prepressure should be applied again.
(4) Support removal should be carried out after the structural members of the replacement support meet the bearing capacity required for the replacement support.
