Tunnel load shedding structure and construction method thereof

Abstract

The invention discloses a tunnel load shedding structure and a construction method thereof, and relates to the technical field of tunnel engineering.The tunnel load shedding structure comprises a load shedding box, and the load shedding box is arranged at the top of a tunnel; the load shedding box comprises a box body and a rigid foam plastic block, the box body is provided with a closed cavity, the rigid foam plastic block is arranged in the cavity, and the rigid foam plastic block is matched with the cavity. According to the load shedding box, the rigid foam plastic block is adopted as the inner mold, and the pouring problem of the load shedding box can be solved; the water absorption rate of the rigid foam plastic blocks is small, and the rigid foam plastic blocks are arranged in the closed cavity of the box body, so that the situation that the top load of the tunnel is remarkably increased compared with the design load after the box body is filled with water due to leakage can be effectively prevented, and the tunnel load shedding structure has good water stability.

Description

technical field [0001] The application relates to the technical field of tunnel engineering, in particular to a tunnel load reduction structure and a construction method thereof. Background technique [0002] In related technologies, in order to solve the problems brought about by the large soil load on the top of the deep-buried tunnel to the tunnel structure design, methods such as increasing the thickness of the structure, setting up an overhead layer on the top of the tunnel, and replacing the top of the tunnel with lightweight concrete are mainly used. Among them, the main disadvantage of increasing the thickness of the structure is that the structure’s self-weight increases, which further increases the structural load; setting up an overhead floor will lead to an increase in construction joints, which is not conducive to the waterproofing of underground structures, and is not suitable for deep buried immersed tunnels; Concrete has the problem of anti-floating of the re...

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Problems solved by technology

Among them, the main disadvantage of increasing the thickness of the structure is that the structure’s self-weight increases, which further increases the structural load; setting up an overhead floor will lead to an increase in construction joints, which is not conducive to the waterproofing of underground structures, and is not suitable for deep buried immersed tunnels; Concrete has the problem of anti-floating of the replacement material itself, and at the same time it is difficult to accurately estimate the water absorption rate and the weight after water absorption in the later stage, which brings uncertain risks to the operation safety of the tunnel structure

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