Arched subway station old and new building connection structure and construction method

Abstract

The invention relates to an arched subway station old and new building connection structure and a construction method. A profile steel pull rod is made of profile steel and divided into two sections which are connected, and a gap is reserved in the middle of the profile steel pull rod and is provided with a bolt fastening mechanism. A plurality of groups of chemical screws are oppositely arranged on the inner side of a bottom girder of an arched ceiling arranged in the range of an opening disposed on the lateral wall of an existing station, a plurality of profile steel pull rods with two ends respectively fixedly provided with wedge-shaped steel plates are fixedly connected with the corresponding chemical screws through the wedge-shaped steel plates, and the profile steel pull rods are connected between the bottom girders arranged on two sides of the arched ceilings and are fixed. The construction method is characterized in that firstly the profile steel pull rods are adopted to exert tensioning force on arched angle portions in advance, then a newly built structure is adopted to reinforce the supporting ceilings, and finally the old structure is demounted in segmented mode. Operation is easy, construction procedure is simple, and control on deformation and internal force conversion of the existing structure is benefited.

Description

technical field [0001] The present invention relates to the field of subway engineering, and is mainly aimed at transfer stations that are not built at the same time in subway engineering, including stations for channel transfer and main body transfer, that is, projects that need to open holes in the side walls of existing stations, especially Vaulted station for underground excavation construction. Background technique [0002] With the development of social economy, the problem of modern traffic congestion is becoming more and more prominent. Building underground railway has become one of the effective ways to solve this problem. The subway station is an important part of urban subway. Taking Beijing as an example, according to statistics, in 2010, there were 57 transfer nodes among the lines that have been built or are under construction. In the planning map of Beijing’s rail transit lines in 2050, the number of node stations that need to realize transfers is as high as 1...

AI Technical Summary

Problems solved by technology

In the construction of such projects, the existing subway is a lifeline project, and the construction control indicators for new projects are very strict. If sufficient measures and methods are not adopted, it will have extremely adverse social impacts

In particular, the currently widely implemented underground excavation arch stations are generally buried deep, and the arch corners bear very large vertical loads and horizontal thrusts. If the demolition plan for the old structure is unreasonable, the damage to the existing line station structure will be very large. If there are a large number of penetrating cracks, serious water leakage, reduced bearing capacity, and unsatisfactory durability at the demolition site, the damage to the existing station structure is irreversible and should belong to the category of engineering accidents

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