Unilateral glass rib-reinforcement cage structure for shield tunnel portal diaphragm wall

Abstract

The invention discloses a unilateral glass rib-reinforcement cage structure for a shield tunnel portal diaphragm wall. The structure comprises an underground diaphragm wall reinforcement cage, a tunnel portal steel ring is tightly attached to and connected to the soil backing side face of the underground diaphragm wall reinforcement cage, an annular reinforcement truss which is concentric with thetunnel portal steel ring is connected between a soil facing side face and a soil backing side face of the underground diaphragm wall reinforcement cage, the annular reinforcement truss is located onthe periphery of the tunnel portal steel ring, the parts, located on the inner periphery of the tunnel portal steel ring, of soil facing side vertical reinforcements striding over the tunnel portal steel ring are replaced by vertical glass fiber bars, and the parts, located on the inner periphery of the tunnel portal steel ring, of soil facing side horizontal reinforcements striding over the tunnel portal steel ring are replaced by horizontal glass fiber bars. The tunnel portal steel ring is used for receiving and pre-burying a shield tunneling machine when serving as a main body structure, and the arranged annular reinforcement truss is used for ensuring that the glass fiber bars are not influenced by gravity to be infinitely broken when the reinforcement cage is lifted, so that the lifting safety of the reinforcement cage can be ensured, and the stress requirement of a wall body can be met.

Description

technical field [0001] The invention relates to the field of subway construction, in particular to a single-side glass reinforcement-reinforcement cage structure used for ground connection walls of shield tunnels. Background technique [0002] Conventional subway stations usually have two floors, and triple-pipe high-pressure piles are usually used for reinforcement at the ends. The demolition of the portal is the overall demolition of the enclosure within the portal, and the safety risk is small. For ultra-deep transfer stations (three to four floors) that are adjacent to surrounding buildings or affected by underground structures, there is no ground reinforcement condition, and there is high pressure water under the basement. Conventional horizontal reinforcement and freezing method reinforcement cannot meet the construction safety of opening doors Requirements; There are still certain construction risks when demolishing the portal. [0003] In order to minimize the const...

AI Technical Summary

Problems solved by technology

At the opening of the 1.5m-thick underground diaphragm wall, double-sided glass bars with equal cross-sections may be used. During the hoisting process, the glass fiber cage may not be hoisted, or the steel bars on both sides may be squeezed toward the glass fiber cage, causing the glass fiber bars to be broken. Therefore, the fiberglass cage needs to be reinforced with steel bars or channel steel alone. During the process of lowering the reinforcement cage, the reinforced steel bars or channel steel need to be cut off, which is time-consuming and may cause construction risks such as the collapse of the tank wall and serious shrinkage cavities due to too long hoisting time.

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