Device for positioning tunnel secondary lining steel bar layer spacing and protection layer

Abstract

The invention discloses a device for positioning the tunnel secondary lining steel bar layer spacing and a protection layer. The device comprises a fixed pipe body (2) and is characterized in that oneend of the fixed pipe body (2) is connected with a U-shaped clamping head (1) through a screw (1-4), and the other end of the fixed pipe body (2) is connected with a base (4) through a screw rod (4-1); and a clamping disc (3) is arranged between the base (4) and the fixed pipe body (2) and mounted on the screw rod (4-1) in a sleeving mode. According to the device, the protection layer on the outer side, the layer spacing and the spacing of circumferential main ribs are controlled through angle steel clamps on the clamping disc, the fixed pipe body and the U-shaped clamping head correspondingly, an inner layer positioning skeleton is formed, by adjusting the screw and the screw rod, the spacing can be controlled precisely, the position positioning problem of the tunnel secondary lining double-layer steel bar main ribs and the protection layer is solved successfully, rib exposing is prevented, and the standard requirements for the structure are met.

Description

technical field [0001] The invention relates to a steel bar positioning tool for building construction. Background technique [0002] In the construction of railways, highway tunnels and water conservancy tunnels, double-layered steel bars are often configured with secondary lining concrete. During construction, due to tunnel excavation, there will be over- and under-excavation of double-layered steel bars. L-shaped positioning steel bars are often used for the positioning of double-layered steel bars. To help fix the position to meet the requirements of the design position. Due to the large amount of L-shaped positioning steel bars, it will cause a lot of waste and greatly increase the construction cost. Therefore, it is necessary to solve the problem of positioning the double-layer steel bars in another way, which can be used repeatedly, has low cost, simple operation and reliable performance. Contents of the invention [0003] The technical problem to be solved by the...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a positioning device for the distance between the double-layer reinforcement layers of the tunnel lining and the protective layer, so as to overcome the waste problems of using L reinforcement for positioning, which has a large amount of use and high cost in the prior art.

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