A groundwater control method in the construction phase of pba underground excavation subway station

Abstract

The invention discloses a method for controlling groundwater in the construction phase of a PBA underground excavation subway station. The construction steps of the steel pipe pile water-stop curtain are as follows: step 1, prefabricating the first steel pipe pile (1) and the second steel pipe pile (2) ); Step 2, welding the first connecting portion (3) on the first steel pipe pile (1), and welding the second connecting portion (4) on the second steel pipe pile (2); Step 3, punching holes After completion, insert and install the first steel pipe pile (1), then lift the second steel pipe pile (2) vertically, insert the convex part of the second connecting part (4) into the concave part of the first connecting part (3) , the second steel pipe pile (2) slowly descends under the guidance of the slow-down member (5) until it is in place, and is limited by the limiter (6). The method has little impact on the surrounding environment, can save water resources, is easy to connect and locate between steel pipe piles during construction, has a reliable structure, and has a good water blocking effect.

Description

technical field [0001] The invention belongs to the field of underground engineering construction, in particular to a groundwater control method in the construction stage of a PBA underground excavation subway station. Background technique [0002] The PBA construction method, also known as the hole pile method, belongs to a kind of shallow buried underground excavation method. In the PBA construction method, the structural stress system is mainly formed by piles, beams and arches, which bear the construction load. Excavation under the structural system formed by piles, beams and arches ensures the safety of the excavation process of the main body. This method is mainly divided into small pilot tunnel excavation, beam-column system construction, buckle arch construction and structural main body forming. This construction method combines the cover excavation method and distributed excavation method organically, and has the advantages of high construction safety and good surf...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that the existing method of groundwater control in the construction stage of PBA underground excavation subway station is very harmful to the surrounding environment, is not conducive to saving water resources, and the connection and positioning of steel pipe piles during construction is difficult and poor in reliability.

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