Construction method of pre-buried steel purlin plugging head system for underground diaphragm wall

Abstract

The invention relates to an underground diaphragm wall embedded steel enclosing purlin plug system and a construction method thereof. The end expanded sections of subway station foundation pits have lots of internal and external corners, most of supports are diagonal bracings, a stress is complicated, and the deforming control difficulty of the foundation pits is large. Vertical force transfer steel plates perpendicular to steel enclosing purlins are arranged on the outer sides of underground diaphragm walls of the steel enclosing purlin ends. Steel enclosing purlin embedded steel plates are arranged on the surfaces of the underground diaphragm walls on the outer sides of the force transfer steel plates, shear-resistant anchoring ribs perpendicular to the steel enclosing purlin embedded steel plates are arranged in the underground diaphragm walls on the inner sides of the steel enclosing purlin embedded steel plates, the outer sides of the steel enclosing purlin embedded steel plates are provided with horizontal shear-resistant steel plates perpendicular to the steel enclosing purlin embedded steel plates, and one end of each shear-resistant steel plate is connected and fixed to the corresponding force transfer steel plate. The underground diaphragm wall embedded steel enclosing purlin plug system utilizes shear-resistant plugs formed by welding and connecting the embedded steel plates, the shear-resistant anchoring ribs, the shear-resistant steel plates and the force transfer steel plates, can effectively resist shear forces transferred by the diagonal bracings and is convenient to construct, and the quality can be effectively guaranteed in the modes of the embedded steel plates and the anchoring ribs.

Description

technical field [0001] The invention belongs to the technical field of subway station foundation pit engineering, and in particular relates to a pre-buried steel purlin plug system for an underground diaphragm wall and a construction method thereof. Background technique [0002] At present, more and more subway stations are built in the bustling areas of the city and the areas with heavy traffic, and there are many surrounding buildings and pipelines. The construction of the subway will undoubtedly have a greater impact on the surrounding environment, especially in areas with high groundwater levels. It will aggravate the adverse impact on the surrounding environment. Therefore, subway stations with strict requirements on the surrounding environment often adopt the form of underground diaphragm wall support system. Since most of the ground connection walls are of standard width, the steel support of the standard section can be directly supported on the ground connection wall...

AI Technical Summary

Problems solved by technology

Since most of the ground connection walls are of standard width, the steel support of the standard section can be directly supported on the ground connection wall, and steel purlins may not be used, and the enlarged end section is restricted by the layout of the ground connection wall, and at the same time, in order to increase its overall stability , to control the deformation, local steel purlins are usually set up, and the steel braces are braced on the steel purlins. Difficult construction and inaccurate positioning often cause the anchor bar to fail to fully exert its shear performance

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