Mud protection wall bored pile construction method

Abstract

The invention provides a mud protection wall bored pile construction method. The method comprises the steps of: a pile hole positioning step; a protection cylinder embedding step; a layered hole forming step: after a sand soil layer in one pile position is drilled to a rock layer by adopting a rotary excavation drilling mode, a punching drill is adopted to drill to a designed bottom elevation of a rock layer in the pile position; a primary hole cleaning step; a reinforcement cage and guide pipe placing step; a secondary hole cleaning step; and a concrete casting and guide pipe disassembly step. In the method, a rotary excavator is adopted to drill the sand soil layer of a pile hole to a rock layer interface; a punching pile drier is adopted to drill a pile end bearing course to the designed bottom elevation of the rock layer in the pile position; and through use of the advantage of high construction efficiency of the rotary excavator on the sand soil layer and use the advantage of capability of effectively preventing easy fall of a drill bit of the rotary excavator in high-density clay or incapability of drilling hard rock in the punching pile driver, the construction speed is greatly accelerated, the construction period is shortened, and the hole forming quality is improved.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a construction method of a mud retaining wall bored cast-in-place pile. Background technique [0002] At present, urban buildings are becoming denser and taller, which puts higher requirements on the foundation and foundation of the construction industry. The building form has gradually changed from traditional multi-storey and high-rise structures to super high-rise structures, and there are more and more deep foundation pits and deep foundations, especially pile foundations that can reach tens of meters or even hundreds of meters. [0003] With the development of technology, the pile foundation is gradually replaced by large mechanical equipment such as prefabricated pipe piles, rotary drilling, forward and reverse circulation drilling, punching machines, etc. from the original manual digging piles. The mechanical equipment solves the safety problem of manual ...

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Problems solved by technology

[0006] In view of this, the present invention proposes a construction method for bored piles with mud retaining walls, aiming at solving the problems of low hole-forming efficiency and poor quality of existing rock piles

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