Subway station middle pile and steel pipe column construction method

Abstract

The invention discloses a subway station middle pile and steel pipe column construction method. The method is characterized in that a guide hole inverted arch is broken before construction, a guide pit reinforcing ring beam is manufactured, and manual hole digging is carried out, a vertical shaft is used as a mud pit, the slag outlet and the slurry inlet are conveyed into the vertical shaft through a pipeline, a sedimentation zone and a mud zone are arranged in the vertical shaft, and a buffer mud pit is arranged in a small guide hole. When a reverse circulation drilling machine is used for forming a hole, the periphery of the drilling machine is supported by trusses and the drilling machine is fixed on the wall of the guide hole so as to ensure the perpendicularity of the drilling hole, and the situation of slag removal of a footage and a gravel pump is observed carefully during drilling. A pile foundation reinforcement cage is put down after mechanical hole forming, and then the steel pipe column is lowered in a section mode. The top section steel pipe column is finally subjected to unified construction, a steel pipe column top section tool joint is firstly installed, the top section tool joint is in the same model with the steel pipe column, and the top section tool joint is connected to the steel pipe column through a flange and is fixed on the side wall of the small guidehole through the supporting trusses. According to the method, the mud circulation is reasonably designed, the hole forming quality is guaranteed through the reverse circulation drilling machine, the construction process is optimized, the perpendicularity of the steel pipe column is guaranteed by the aid of the tool joint and a vertical adjusting machine, so that the construction safety and the construction efficiency are improved.

Description

technical field [0001] The invention relates to an engineering construction technology, in particular to a method for constructing middle piles and steel pipe columns in subway stations. Background technique [0002] In recent years, newly-built subway stations in the central area of ​​the city basically do not have the construction conditions for open and cover excavation. The special advantages of the underground excavation method have attracted people's attention, and have been widely used in the construction of subway stations and intervals in complex urban engineering environments. Applications. Among them, the traditional PBA construction method requires the excavation of the upper and lower layers of pilot tunnels and precipitation in advance, and the manual digging of holes for side piles and central pillars leads to greater safety risks. The mechanical pile forming method only needs to excavate the upper pilot tunnel, the settlement caused by the construction is sm...

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Problems solved by technology

Among them, the traditional PBA construction method requires the excavation of the upper and lower layers of pilot tunnels a

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