(1) surface defect correction; First, clean up the rust and oil stain on the surface near the defect, then repair it by welding, and then smooth it with a grinding wheel.
(2) Correction of the end rectangle ratio; Cut the pile end with oxyacetylene to make it perpendicular to the axis, and then smooth the cut surface with a grinding wheel to repair it. When the dressing amount is not large, use grinding wheel to repair directly.
(3) deflection correction of piles; Abdominal bending correction: fix the two ends of the bending section of the steel sheet pile on the support point, and use the jack installed on the top beam frame of the gantry to carry out cold bending correction on the convex part of the steel sheet pile; Lateral curvature correction is carried out on a special correction platform. Two ends of the bent section of the steel sheet pile are fixed on the base of the straightening platform, jacks are arranged on the side straightening platform of the bent section of the steel sheet pile at a certain distance, and the convex part of the steel sheet pile is pressed by the jacks for cold bending straightening.
(4) pile deformation correction; Depending on the distortion, you can use.
(3) Method correction.
(5) Correction of local deformation of pile section; The method of jack jacking, hammer tapping and oxyacetylene flame baking is used to correct local deformation.
(6) locking deformation correction; The standard steel sheet pile is used as the locking forming fixture, which is adjusted by slow winch or straightened by oxyacetylene flame, and the fixture is struck by a sledgehammer. The guide frame consists of guide beams and purlin piles, which are divided into unilateral and bilateral in plane; Single and double height. This project adopts single-layer double-sided guide frame. The distance between purlin piles is 2.5~3.5m, and the distance between double-sided purlins is 8 ~ 15mm2 greater than the thickness of sheet pile wall. The position of the guide frame shall not collide with the steel sheet pile. Purlin piles cannot sink or deform with steel sheet piles. Proper height of guide beam is beneficial to control the construction height of steel sheet pile and improve work efficiency. Use theodolite and level to control the position and height of guide beam. In order to ensure the accuracy of steel sheet pile driving, shielding driving method is adopted. Firstly, lift the steel sheet pile to the pile insertion point with a crane, and insert the pile. When inserting piles, aim at the lock, put each piece on the pile cap and tap lightly. In the process of piling, in order to ensure verticality, two theodolite are used to control in two directions. In order to prevent the displacement of the central plane of the lock mouth, a splint is set at the lock mouth of the steel sheet pile along the piling direction to prevent the displacement of the sheet pile. At the same time, the position of each plate is calculated in advance on the purlin for inspection and correction at any time. Steel sheet piles are driven in several times, the first time from 20m to 15m, the second time to 10m, the third time to the height of the guide beam, and the fourth time to the design elevation after the removal of the guide frame. When piling, start setting the driving position and direction of the first and second steel plates to ensure the accuracy, and measure once every1m.