After the spiral steel pipe for steel support is in place, the axis overlaps with the positioning axis, the vertical deviation is controlled within 20mm, and the horizontal deviation is controlled within 30mm. The elevation difference and horizontal deviation at both ends of the support shall not be greater than 20mm or 1/60 of the support length. Steel supports should be perpendicular to the ground to connect the walls. After the hoisting is completed, report to the general contractor for acceptance. The two ends of the servo steel support should be equipped with anti-falling measures, such as preventing the wire rope from falling. The steel support is easy to install and remove, the material consumption is small, and the deformation of the foundation pit can be reasonably controlled by applying prestress. The steel support erection speed is fast, which is beneficial to shorten the construction period, but the overall rigidity of the steel support system is weak. The steel support can only bear the pressure, but not the tension, which can effectively prevent the deformation of the underground diaphragm wall into the foundation pit, but has no binding force on the outward movement of the ground connection wall.
Post time: Apr-17-2023