Construction method and construction device for hard rock stratum pile foundation in low-clearance narrow space

Abstract

The invention discloses a construction method for a hard rock stratum pile foundation in a low-clearance narrow space. The construction method comprises the following steps that S1, a vertical shaft and a transverse channel are sequentially excavated in the outer side of a station; S2, pilot tunnel excavation and primary supporting are conducted; S3, a bottom longitudinal beam is constructed on the lower portion of the inner side of a lower middle pilot tunnel; S4, a hole is drilled; S5, an upper side pilot tunnel fender post is constructed; S6, a steel pipe column between the upper middle pilot tunnel and the lower middle pilot tunnel is constructed; and S7, a drilling device is removed. According to the construction method and construction device for the hard rock stratum pile foundationin the low-clearance narrow space, the drilling device composed of an air compressor and a pneumatic down-the-hole hammer drilling machine is adopted, drilling can be conducted on hard rock stratum pouring in the ultra-low-clearance narrow space, thus the problems that manual hole pile digging is low in work efficiency and high in risk are solved, and an effective solution is provided for construction of a subway underground excavation station fender structure and the steel pipe column in a hard rock stratum; and meanwhile, a water mist dust remover is matched, and dust pollution caused by rock stratum crushing is solved through dust removal.

Description

technical field [0001] The invention relates to a subway construction technology, in particular to a construction method and construction equipment for a pile foundation in a hard rock stratum in a low headroom and narrow space. Background technique [0002] With the continuous development of urban rail transit, the underground stations of rail transit constructed in urban downtown areas or main roads are affected by many surrounding engineering environments and traffic dredging. When the contradiction between open-cut construction of subway stations and ground traffic dredging is difficult to solve, Usually, the cover-excavation (half-cover excavation) method is used for construction, that is, it is necessary to close the ground traffic in a short period of time to complete the construction of the station roof (part of the roof), and then restore the ground traffic. Many are difficult to relocate, and the partial closure of traffic roads will also have a great adverse effec...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a construction method and construction equipment for pile foundations in hard rock formations with low headroom and narrow space. By adopting the drilling equipment composed of air compressor and pneumatic down-the-hole hammer drilling rig, it can be used for ultra-low headroom and narrow space. Drilling in the hard rock formation, which solves the problem of low efficiency and high risk of manual excavation piles, and provides an effective solution for the construction of subway underground excavation station enclosure structures and steel pipe columns in hard rock formations; at the same time, it cooperates with Water mist dust collector, dust removal solves the dust pollution caused by rock formation breakage

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