Gas lifting reverse circulation porus cleaning construction method for slurry bulkhead cast-in-situ bored pile

Abstract

The invention discloses a construction method using gas-lift back-circulation hole cleaning for cast piles by drilling in slurry dado, which comprises the following procedures: (1) setting steel guide tube in the rebar cage depending upon the diameter of the pile; (2) installing special guide-pipe epimerite with an inserting port for hi-pressure rubber tube at top of the steel tube; (3) measuring the specific weight of the slurry in the hole, determining the length of the hi-pressure rubber tube to be inserted into the steel guide tube depending upon the specific weight of the slurry; (4) inserting into the steel guide tube the hi-pressure rubber tube having capillary holes at its bottom; (5) connecting the hi-pressure rubber tube with an air compressor; (6) turning on the air compressor to clear out dregs by gas-lift back circulation. The invention is furnished with rapid dreg-clearing speed, clean and through dreg clearing; comparing with prior process, the invention can improve 3-5 times dreg-clearing speed; the invention guarantees the quality of pipe foundation, is free from slurry pollution and good for environmental protection; and can save water and land. The hole-clearing device and equipment used are easy to install and operate, are practical, the materials are readily available, the price is low and the process is convenient.

Description

technical field [0001] The invention relates to a construction method for a building foundation, in particular to a construction method for clearing holes of bored piles with mud retaining walls by using gas-lift reverse circulation, and belongs to the technology for removing sediment at the bottom of holes during pile foundation construction in the field of engineering construction. Background technique [0002] Pile foundation is a commonly used foundation form in the field of construction, and bored piles occupy a dominant position in the application of pile foundations due to their unique advantages. However, no matter whether the designed pile type is a friction pile or an end-bearing pile, the requirements for the thickness of the sediment at the bottom of the hole before concrete pouring are relatively strict, because the thickness of the sediment at the bottom of the hole directly affects the bearing capacity of the pile. In engineering practice, there are many examp...

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Problems solved by technology

[0003] The object of the present invention is to aim at the defects existing in the existing slag removal method, and to provide a construction method of using air-lift reverse circulation to clear the hole of the mud retaining wall bored pile, so as to solve the problem that the slag cannot be cleaned, which affects the exertion of the pile end resistance. The problem of reducing the bearing capacity of piles

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