Foundation excavation retaining and protecting cast-in-situ bored pile construction method and equipment thereof

Abstract

The invention relates to the technical field of foundation excavation retaining and protecting cast-in-situ bored piles and discloses a foundation excavation retaining and protecting cast-in-situ bored pile construction method and equipment thereof. The method comprises the following steps: 1, adopting a rotary excavating drilling tool to guide a hole in advance; 2, adopting a vibratory hammer to convey a pile casing into the soil layer downward from a hole opening ; 3, adopting the rotary excavating drilling tool to drill to the elevation position at the bottom of the pile casing; 4, adopting an air compressor to supply air into the hole till the air comes out of an opening at the upper end of the hole, and then utilizing a down-the-hole hammer to drill on a bed rock layer; 5, after the down-the-hole hammer drills to a final hole, pulling out the down-the-hole hammer, and infusing slurry into the hole; 6, cleaning the interior of the hole, placing a steel reinforcement cage into the hole, and pouring concrete into the hole; 7, utilizing the vibratory hammer to pull out the pile casing. According to the construction method, a pile casing retaining wall is utilized, and the hole collapse and hole shrinkage can be prevented; the down-the-hole hammer is utilized for cooperating with the air compressor to supply the air, great rock breaking capability is achieved, a rotary drilling machine is adopted for cleaning the hole, the hole formation is made to be greatly accelerated, the construction progress is sped up, and the cost is saved.

Description

technical field [0001] The invention relates to the technical field of bored piles for foundation pit support, in particular to a construction method and equipment for foundation pit support bored piles. Background technique [0002] With the needs of urban development, a large number of new high-rise and super high-rise buildings need to excavate deep foundation pits on the proposed site and effectively support the side walls of the foundation pits. The foundation pit support generally adopts the method of bored piles, and a circle of support piles is formed around the foundation pit. Therefore, when the bedrock of the proposed site is buried deep, and the depth of the foundation pit supporting piles is large, problems such as difficulty in forming holes in the bedrock and inclined holes often occur. [0003] In the existing foundation pit support pile hole forming technology, when constructing the support pile in the bedrock layer 300, the punching drilling process or the...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a construction method of bored piles for foundation pit support, aiming at solving the problem of difficulty in forming holes and low construction efficiency in the construction process of bored piles for foundation pit support in the prior art. and high construction costs

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