Lateral rigidity enhancing structure of open section of subway entrance

Abstract

The invention belongs to the field of deep foundation pit engineering, and discloses a lateral rigidity enhancing structure of an open section of a subway entrance. The lateral rigidity enhancing structure comprises a bottom slab, two main body side walls, top beams, two rows of fender posts, ring beams and joint bars. The two main body side walls are arranged on the bottom slab, and a U-shaped structure is formed by the two main body side walls and the bottom slab jointly. The tops of each row of fender posts bear the corresponding top beam, and the top of each top beam is flush with the top end face of the corresponding main body side wall of the U-shaped structure. Each main body side wall and the adjacent top beam jointly form a ring beam bearing structure. Each ring beam bearing structure bears the corresponding ring beam. The top beams and the ring beams are connected through the multiple joint bars. The lower ends of the joints bars are anchored into the top beams, and the upper ends of the joint bars stretch into the ring beams. The lateral rigidity enhancing structure has the advantages that construction is convenient and fast, the amount of steel bars is small, investment is reduced, and structure safety and the waterproof effect are guaranteed, and has great application prospects in the field of deep foundation pit engineering including subways.

Description

technical field [0001] The invention belongs to the field of deep foundation pit engineering, and more specifically relates to an open section structure of a subway entrance and exit. Background technique [0002] In the open section of the subway entrance and exit, in order to meet the requirements of the clear height of the building, a large opening is set on the roof (generally more than 12m along the entrance and exit direction). The structure here is a U-shaped structure with only the bottom plate and the main side wall. Under the high anti-floating water level, the open section of the entrance and exit needs to use the enclosure structure to participate in the anti-floating; on the other hand, because the main side wall is a cantilever structure fixed on the lower side, under the action of lateral water and soil pressure, the force of the main side wall larger. For the problem of anti-floating, the current common practice is that the crown beam is 200mm-300mm wider th...

AI Technical Summary

Problems solved by technology

For the problem of anti-floating, the current common practice is that the crown beam is 200mm-300mm wider than the surrounding protection piles, and a groove is set during the construction of the main side wall, and the surrounding structure is used to participate in anti-floating. However, because the steel bars in the groove are not easy to bind, Moreover, the waterproofing at the special-shaped interface is not easy to deal with, which often increases the difficulty of construction and affects the construction period; in view of the problem of large force on the main side wall, generally increase the thickness of the main side wall of the cantilever or increase the reinforcement at the junction of the main side wall and the bottom plate, so that Increase the scale and cost of entrances and exits

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