Underground water control method for PBA underground excavation subway station construction stage

Abstract

The invention discloses an underground water control method for a PBA underground excavation subway station construction stage. The underground water control method comprises the following construction steps of a steel pipe pile waterproof curtain: step 1, prefabricating a first steel pipe pile (1) and a second steel pipe pile (2); step 2, welding a first connecting part (3) on the first steel pipe pile (1), and welding a second connecting part (4) on the second steel pipe pile (2); and step 3, after punching is completed, inserting and installing the first steel pipe pile (1), then vertically hoisting the second steel pipe pile (2), inserting a convex part of the second connecting part (4) into a concave part of the first connecting part (3), and slowly descending the second steel pipe pile (2) under the guidance of a slow descending part (5) until the second steel pipe pile (2) is in place and is limited by a limiting part (6). The underground water control method has the advantages that the influence on the surrounding environment is small, water resources can be saved, the connection and positioning between the steel pipe piles are easy in construction, the structure is reliable, and the water blocking effect is good.

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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