Cast-in-situ bored pile hole-forming device and method

Abstract

The invention discloses a cast-in-situ bored pile hole-forming device and method. Dirt slurry at the hole bottom is conveyed to a coarse screening device through a drilling rod by means of a gravel pump, a coarse slag material flows into a coarse screening slag material pool after the dirt slurry is subject to coarse screening through the coarse screening device, and the rest of the dirt slurry flows into a slurry storage tank; the slurry in the slurry storage tank is conveyed to a hydrocyclone through a slag slurry pump and is subject to fine screening through the hydrocyclone, then a fine slag material flows into a fine screening slag material pool, and the rest of the slurry flows into a middle storage tank; and the slurry inside the middle storage tank is conveyed to space between the drilling rod and the hole wall by an overflowing opening formed in the pool wall or through a slurry pump, and therefore a reverse circulation loop is formed. By adopting a pumping suction reverse circulation hole cleaning manner, the hole-forming rate and the hole cleaning efficiency can be improved, the waste slurry discharge amount is less, the single-pile construction time is shortened, the inward contraction amount of the hole wall is reduced, and the construction quality is improved. By means of two-stage screening through the coarse screening device and the hydrocyclone, the quality of slurry circulated back to holes can be improved, slag sinking to the hole bottom is further reduced effectively, and the hole wall is more stable.

Description

technical field [0001] The invention relates to the field of bored pile construction, in particular to a bored pile hole-forming device and method. Background technique [0002] With the rapid development of science and technology and economic construction, high-rise and super high-rise buildings in Shanghai are constantly rising at an unprecedented speed, and pile foundations are increasingly becoming the super-deep forms commonly used in these high-rise buildings. Due to the characteristics of no vibration, low noise and little impact on the surrounding environment of bored piles, and most of the high-rises and super high-rises in Shanghai are located in the city center, bored piles have received general attention from the Shanghai construction industry and have become the current pile foundation. One of the most popular forms of . [0003] With the continuous refresh of the building height records in Shanghai, bored piles are also constantly developing in the direction o...

AI Technical Summary

Problems solved by technology

Conventional positive circulation hole forming and positive circulation hole cleaning technology can no longer meet the construction requirements, especially at present, ultra-deep bored piles generally need to pass through the 7th and 9th silt layers, often due to hole quality problems Common quality problems such as the verticality of the pile body, the shrinkage of the pile body, or the inclusion of mud and sand

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