A kind of construction method of stiff composite pile

Abstract

The invention relates to an efficient construction method for a novel stiff composite pile. The method comprises the following steps: (1) surveying and positioning; (2) preparing a pile driver in position; (3) high pressure rotary jetting cement soil pile construction: including: <1> wet spraying and sinking; <2> lifting a drill bit, reversing to spray ash, spraying cement slurry in the lifting process to stir, and jetting the cement mortar to a stirred soil mass through a mortar sender, wherein the soil mass and cement are fully mixed along the depth direction; <3> finishing lifting; <4> remixing; <5> dry spraying: rotating the drill bit reversely to spray ash while lifting, wherein the soil mass and powder are fully mixed, the soil mass is fully crushed, and the cement powder is uniformly dispersed to pile soil; and (4) tubular pile hammering construction: a tubular pile shall be implanted into a peripheral cement pile before cement soil is initially set. By means of the steps of high pressure rotary jetting cement soil pile construction and tubular pile hammering construction, the method is efficient and higher in operability. Remixing is an effective measure to guarantee pile forming uniformity and improve the pile strength; the cement soil body is stirred with a large diameter, and the tubular pile is inserted into the middle, so that the bearing capacity of a single pilecan be improved greatly.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a construction method of a rigid composite pile. Background technique [0002] The construction technology of rigid composite pile is a technology that combines two or three kinds of single piles through a certain process such as loose piles, flexible piles, and rigid piles to form a rigid composite pile. At present, the construction technology of stiff composite piles has been used in Jiangsu, Shanghai, Yunnan, Hebei and other places. [0003] For example, in Chinese patent document CN107044120A, disclose a kind of construction method of large-diameter ultra-deep layer mixing and injecting strength compound pile, comprise the following steps: Design the pile depth; step 2, the drill pipe is changed to the lifting and spraying method, and the spraying drill bit is lifted under the state of slurry pressure until the spraying drill bit is lifted to the ground, and th...

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Problems solved by technology

[0004] The technical solutions disclosed in the above patent documents are used in the construction of rigid composite piles. The pile body has a large bearing capacity, which can greatly reduce the project cost, reduce environmental pollution, and achieve the purpose of green construction. However, the construction efficiency is not ideal, and further work is needed. improve

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