Existing metro station interchange joint underground excavation section lifting construction method

Abstract

The invention discloses an existing metro station interchange joint underground excavation section lifting construction method. The method comprises the following steps that 1, a ground connecting wall is excavated and exploded from the two sides of an existing line main body structure; 2, excavating is carried out to the interchange joint underground excavation section below the existing line main body structure; a newly-built main body structure is made, a negative one layer side wall and a top plate of the newly-built main body structure are connected with a negative one layer side wall anda top plate of the existing line main body structure, and a negative second layer side wall and a middle plate of the newly-built main body structure are connected with a negative second layer side wall and a middle plate of the existing line main body structure, so that a lifting system is formed; 4, water falling and grouting reinforcement is carried out on the interchange joint underground excavation section; 5, the reinforced interchange joint underground excavation section is excavated, and underground excavation main body structure construction is carried out; and 6, the remaining ground connecting wall is exploded, and post-cast strips are poured. Stress on the connecting portion of the existing line main body structure and the newly-built main body structure is monitored. The method reduces the risk of sediment of the existing structure in the excavation process.

Description

technical field [0001] The invention relates to the technical field of underground excavation construction, in particular to a lifting construction method for an existing subway station transfer node underground excavation section. Background technique [0002] With the development of the national economy, the number of urban subway constructions is increasing day by day. With the increase of line interchange planning, the number of transfer stations is also increasing. In China, there are two methods for the reservation of transfer nodes: the first method, the station under construction in the early stage only reserves the excavation conditions for the negative third floor of the transfer node in the later stage, and only prepares the enclosure structure for the later station construction (ground connection wall) and the supporting column in the middle, so that the position of the transfer node in the later station construction is in the closed box state of the surrounding ...

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Problems solved by technology

[0006] However, the above technical solution has the problem of subsidence of the existing subway station at the transfer node during construction (this part is a description of beneficial effects, it is not appropriate to put it in the background technology, and it is moved to the embodiment part)

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