The construction method of underground excavation tunnel closely sticking to the bottom plate of the existing structure

Abstract

The invention relates to a construction method for enabling an existing structural baseplate to pass through a subsurface tunnel downwards in a close lamination mode. The method comprises the following steps: digging an upper guide hole of the tunnel, and reserving a soil layer with a certain thickness between the top of the formed upper guide hole and the corresponding existing structural baseplate; installing a primary branch structure on the inner wall of the formed upper guide hole; excavating the reserved soil layer to form a gap; supplying a support part, enabling the support part to beplaced in the gap and support the existing structural baseplate, and then enabling the support part and the top of the primary branch structure to be fixedly connected; and spraying concrete towards the inner wall of the formed upper guide hole so as to form an anchoring primary branch structure and the primary branch concrete structure of the support part. According to the construction method, the support part supported below the existing structural baseplate is adopted, the support part and the primary branch structure are fixedly connected, the support part, which is additionally arranged,is utilized to support the existing structural baseplate to control the falling of the existing structural baseplate, and the support part is anchored in the primary branch concrete structure, therebyreinforcing the support strength of the support part.

Description

technical field [0001] The invention relates to the field of tunnel construction engineering, in particular to a construction method for a submerged tunnel to closely adhere to the bottom plate of an existing structure. Background technique [0002] At present, the demand for subways in various cities in China, the intersection, parallel, connection, and co-construction of new rail lines and existing rail lines are increasing. It is inevitable that some subway stations or sections are close to or even close to existing lines. Construction, because some subway lines in operation have been constructed for a long time, limited by the materials and construction techniques at that time, and the structural safety of some lines has reached a critical state. Therefore, on the premise of ensuring the safe and normal operation of the existing subway lines, how to safely carry out become a construction problem. In the prior art, the full name of the CRD construction method, the full n...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art, to provide a construction method for underground excavation tunnels to closely adhere to the bottom of the existing structure, and to solve the problem that the existing advanced measures cannot avoid the settlement of the bottom of the existing structure and there are certain potential safety hazards The problem

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