A pile sinking construction method for prefabricated concrete sheet piles

Abstract

The invention relates to a pile sinking construction method for a precast concrete plank pile. The construction method includes the steps that firstly, a crane is used for vertically lifting up the plank pile to a pile position for primary position, and the plank pile is inserted into the soil layer through the self gravity of the plank pile; secondly, a centering device is used for clamping a pile body of the plank pile, and verticality adjustment and construction axis correction are carried out; thirdly, after correction and straightening are finished, a hook, for hooking the pile, of the crane is released, a hydraulic impacting pile hammer is lifted, and the pile top is sleeved with a pile top steel cap at the lower end of a hammer head of the pile hammer; fourthly, after the pile top is sleeved, pile driving is carried out, the sinking pile verticality is monitored anytime in the driving process, and the inclination of the pile body in all the directions is corrected in time through the centering device in order to keep vertical pile sinking of the plank pile; and fifthly, when pile sinking is carried out to the designed elevation preset value position of the pile top distance, the centering device is released, and pile driving construction continues until the pile top is fed to the designed elevation. According to the construction method, the pile forming quality is good, tidy and tight matching degree of joints between plank piles can be well guaranteed, the construction speed is high, and the work efficiency is high.

Description

technical field [0001] The invention relates to a pile sinking construction method of prefabricated concrete sheet piles. Background technique [0002] In recent years, a kind of prefabricated concrete sheet pile has appeared in support projects at home and abroad. Because of its advantages of large soil retaining area, good bending resistance of the pile body, and simple construction organization, it has been used in some projects. At present, the construction of concrete sheet piles adopts the traditional vibration pile sinking method, supplemented by the construction method of steel guide frame for positioning. The principle of this construction method is to transmit the shock force to the pile body through the vibration of the vibratory hammer The soil around the sheet pile is liquefied or loosened by vibration of the body, and the pile is sunk by using the weight of the pile body and the weight of the vibrating hammer. This construction method has several very obvious d...

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Problems solved by technology

[0004] The clamping surface is limited, so the pile head is often cracked and damaged during vibration construction;

[0005] Thirdly, the quality of the piles is poor, the joints between the sheet piles are poorly matched, and tenon and rotten joints are prone to occur, and the phenomenon of pile body tilt and pile top plane displacement is more common;

[0006] In addition, this construction method has a relatively narrow adaptability to engineering geology. When encountering a soil layer with a high characteristic value of bearing capacity (over 200KPa), it is difficult to penetrate the pile body using this construction method, and the design of pile bottom embedding cannot be achieved. The elevation greatly affects the structural stability of the sheet pile wall, and the scope of engineering application is limited

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