Cavern-pile mechanical construction method for shallow subsurface excavated metro station at water-rich sandy stratum

Abstract

The invention discloses a cavern-pile mechanical construction method for a shallow subsurface excavated metro station at a water-rich sandy stratum. The cavern-pile mechanical construction method comprises the following steps of: (1) laying railway rails, which are convenient for a drilling machine to move in a cavern in construction, at two sides of a pile line, and mounting rail wheels on a base of the drilling machine; (2) lowering the drilling machine equipped with the rail wheels via an open excavated wellhead by using a truck crane or a gantry crane, and then moving the drilling machine to a guide cavern along the railway; (3) positioning the drilling machine, connecting to a mud separation system and applying drilling operation; (4) after the drilling and cleaning operations are finished, sectionally lowering reinforcement cages, connecting the reinforcement cages by using forward-backward threads of straight-thread sleeves, and fixing the reinforcing cages by arranging *-shaped steel frames at tops of the reinforcement cages; (5) adopting commercial concrete, pumping from a grounding pump to a pile position, and then grouting in a conduit method. The mud separation system consists of a mud pool, a mud pump, a cyclone desander, a drilling mud pool, a primary vibration screen and a secondary vibration screen. The cavern-pile mechanical construction method for the shallow subsurface excavated metro station at the water-rich sandy stratum has the advantages of high construction speed, safe construction, little mud produced in the construction, and the stability of the guide cavern can be enhanced.

Description

Technical field: [0001] The invention belongs to a building construction method, in particular to a mechanical construction method for tunnel piles in underground digging subway stations in shallow buried water-rich sand layers. Background technique: [0002] At present, when the "PBA" method is used to construct the side piles of the pilot tunnel in domestic shallow buried underground excavation subway stations, the method of manually digging holes is generally used. [0003] The construction method of manual digging has the advantages of convenient operation, small space occupation, no mud discharge, and little impact on the surrounding environment. However, today when mechanization is widely used in construction, manual digging technology cannot keep up with the rhythm of mechanical construction to a certain extent. Compared with mechanical hole forming, it is outstanding in the following two aspects: [0004] 1. Manual digging is limited by the space. Generally, there a...

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the above-mentioned shortcoming of manual digging and ordinary drilling machinery construction, and provide a kind of mechanical construction method of underground digging subway station hole piles in shallow water-rich sand layer, which has fast construction speed, safe construction and convenient construction. The process produces less mud and enhances the stability of the pilot tunnel

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