Pre-embedding device and method of tunnel vault ground terminals

Abstract

The invention discloses a pre-embedding device and method of tunnel vault ground terminals and belongs to the technical field of tunnel supporting. The device comprises a primary supporting lining of a tunnel and a secondary lining trolley, circumferential rebars are arranged inside the arch surface along the primary supporting lining of the tunnel, a top form of the secondary supporting lining trolley is a cambered surface compatible with the arch surface of the primary supporting lining of the tunnel, the top form of the secondary supporting lining trolley is arranged closely to the bottom of the circumferential rebars, the middle of the circumferential rebars are provided with ground terminals, the circumferential rebars on the lateral sides of the ground terminals are provided with fixed connecting parts respectively, the bottoms of the fixed connecting parts are welded on a top plate of the secondary supporting lining trolley, secondary lining concrete is casted between the top plate of the secondary supporting lining trolley and the first supporting lining of the tunnel. The invention also discloses a method of pre-embedding tunnel vault ground terminals. The pre-embedding device and method of tunnel vault ground terminals allow ground terminals to be pre-embedded accurately.

Description

Technical field [0001] The invention relates to the technical field of tunnel support, in particular to a pre-embedding device and a pre-embedding method for a non-structural reinforced vault ground terminal in the lining construction of a II and III surrounding rock tunnel. Background technique [0002] At present, when applied to the tunnel through which electric locomotives pass in grades Ⅱ and Ⅲ surrounding rock sections, because the surrounding rock is relatively stable, lining structural steel bars are generally not installed in the secondary lining, but according to the requirements of the electric locomotive's catenary, the electric locomotive passes through The first ground terminal is set at the entrance of the tunnel vault at 2 meters, and 2 ground terminals with a spacing of 5 meters shall be set every 45 meters thereafter. The ground terminals are usually connected with the structural steel bars in the vault lining structure. , In order to achieve the purpose of reli...

AI Technical Summary

Problems solved by technology

In order to solve the grounding problem of the tunnel vault without lining structural reinforcement, the construction site is to set a ring reinforcement separately as the lead-out ground wire of the catenary at the tunnel where the secondary lining is not provided with lining structural reinforcement. There is a bridge-tunnel type grounding terminal on the top of the steel bar. When the trolley for the secondary lining is in place, concrete (concrete) is poured in the pre-set secondary lining pouring space where the circular steel bar is located. Because the circular steel bar Without a fixed fulcrum, the movement and rotation of the circumferential reinforcement often occurs when pouring concrete, resulting in misalignment of the grounding terminal, and even causing the grounding terminal to be directly buried in the concrete, making it impossible to find it, which affects the smooth progress of the later project

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