CN210343394U

CN210343394U - Tunnel anchor rod backing plate

Info

Publication number: CN210343394U
Application number: CN201920990065.3U
Authority: CN
Inventors: 陈阳; 郭宏; 刘涛; 周亮; 孙茂
Original assignee: Traffic Engineering Branch of China Railway Sixth Group Co Ltd
Current assignee: Traffic Engineering Branch of China Railway Sixth Group Co Ltd
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2020-04-17
Anticipated expiration: 2029-06-27

Abstract

The utility model discloses a tunnel anchor rod backing plate, which comprises an anchor box and a PVC cap; the anchor box is an integrally punched box-shaped component, the height of the anchor box is consistent with the re-spraying thickness, and the bottom of the anchor box is provided with an anchor hole for an anchor rod to pass through; the PVC cap covers the top of the anchor box. The utility model can embed the anchor backing plate into the primary support, thereby ensuring that the anchor backing plate does not leak, reducing labor cost for cutting the anchor rod head and wrapping mortar, avoiding lining void and local thickness deficiency, ensuring the operation of tunnel lining structure thickness and water-proof and drainage system, and reducing the risk hidden trouble caused by unsmooth drainage in later tunnel operation; the construction time of the primary support anchor rod of the tunnel is advanced to the time after primary spraying of the tunnel, and the primary support anchor rod construction time and the primary support procedure of the tunnel are synchronously implemented, so that the construction cross influence formed by the construction anchor rod after the subsequent primary support is finished is reduced, and the anchoring effect of the anchor rod and the surrounding rock deformation control effect in the early stage are fully exerted.

Description

Tunnel anchor rod backing plate

Technical Field

The utility model relates to a tunnel engineering construction technical field specifically is a tunnel stock backing plate.

Background

According to related data, the anchor backing plate for the anchor rod construction of the tunnel engineering in China is basically of a flat plate structure, the anchor backing plate is arranged between an anchor rod bolt and a primary support surface, the anchor rod and the anchor backing plate are installed by drilling after primary support and secondary concrete spraying are finished, the bolt is fastened after the strength of anchor rod grouting slurry meets design requirements, and surrounding rock radial reinforcement stress is carried out.

From present stock job site, there are a lot of problems:

1) the anchor backing plate is located the primary surface outside, need to wrap up outer hourglass anchor backing plate adoption mortar before laying and hanging the waterproof board to prevent that the anchor pole head from impaling the waterproof board. In actual construction, the anchor backing plate is not wrapped by mortar or is not wrapped completely frequently, so that the waterproof plate is pierced, the whole waterproof system of the tunnel engineering is damaged, and potential safety hazards are buried in later-stage tunnel operation.

2) Need the outer stock that leaks outside the excision stock bolt before waterproof sheet is laid and is hung, have the outer stock of stock fastening bolt basically all to be amputated, the stock bolt is easily not hard up, influences the fastening effect of stock.

3) After the anchor rod leaks outside the primary support surface part and is wrapped by mortar, the tunnel lining is locally insufficient in thickness, and the overall structure of the tunnel lining is affected.

4) After the part of the anchor rod leaking outside the primary support surface is wrapped by mortar, the waterproof plate cannot be closely attached to the primary support surface, and the primary support of the anchor rod and the waterproof plate are separated in the pouring process of lining concrete. The later stage generally adopts the slip casting to remedy, and the slip casting drilling can impale the tunnel waterproof board to the slip casting thick liquid can block up the vertical drainage pipe way in tunnel hunch foot lower part, causes serious influence to the whole drainage system of preventing of tunnel.

5) The adoption of the cutting anchor rod head and the mortar wrapping consumes labor, and the construction quality is not easy to control.

6) At present, after the primary support of a tunnel is integrally completed, the strength of primary support concrete reaches the design requirement, drilling is carried out, and an anchor rod is installed, at the moment, tunnel surrounding rock begins to deform, and the anchor rod cannot practically play a due role.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, an object of the present invention is to provide a tunnel anchor plate which can ensure the stress structure of the anchor and avoid the damage and influence to the tunnel lining and the waterproof drainage system. The technical scheme is as follows:

a tunnel anchor rod base plate comprises an anchor box and a PVC cover cap; the anchor box is an integrally punched box-shaped component, the height of the anchor box is consistent with the re-spraying thickness, and the bottom of the anchor box is provided with an anchor hole for an anchor rod to pass through; the PVC cap covers the top of the anchor box.

Further, the bottom of the anchor box is provided with an upper concave part, and the anchor hole is located in the center of the upper concave part.

Further, the inner diameter of the anchor hole is determined according to the diameter of the anchor rod.

The utility model has the advantages that: the utility model can embed the anchor backing plate into the primary support, thereby ensuring that the anchor backing plate does not leak, reducing labor cost for cutting the anchor rod head and wrapping mortar, avoiding lining void and local thickness deficiency, ensuring the operation of tunnel lining structure thickness and water-proof and drainage system, and reducing the risk hidden trouble caused by unsmooth drainage in later tunnel operation; the construction time of the primary support anchor rod of the tunnel is advanced to the time after primary spraying of the tunnel, and the primary support anchor rod construction time and the primary support procedure of the tunnel are synchronously implemented, so that the construction cross influence formed by the construction anchor rod after the subsequent primary support is finished is reduced, and the anchoring effect of the anchor rod and the surrounding rock deformation control effect in the early stage are fully exerted.

Drawings

Fig. 1 is the structural schematic diagram of the tunnel anchor plate of the present invention.

In the figure: 1-anchor box, 2-PVC cover cap; 3-primary spraying of a concrete surface layer; 4-surrounding rock surface layer; 5-anchor rod; 6-anchor hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. As shown in fig. 1, the tunnel anchor plate comprises an anchor box 1 and a PVC cap 2; the anchor box 1 is an integrally punched box-shaped component, the height of the anchor box is consistent with the re-spraying thickness, and the bottom of the anchor box is provided with an anchor hole 6 for an anchor rod 5 to pass through; the PVC cap 2 covers the top of the anchor box 1. The bottom of the anchor box 1 is provided with an upper concave part, and the anchor hole 6 is positioned in the center of the upper concave part.

Can process adjustment anchor box 1 size according to tunnel just props up compound concrete thickness that spouts, anchor backing plate internal diameter, the internal diameter of anchor eye 6 can be according to the stock diameter processing adjustment promptly, satisfies different diameter stock demands.

The material and the plane size of the anchor backing plate are determined according to relevant national and industrial standard specifications, and the height is processed and customized according to different tunnel primary support thicknesses designed by different tunnels. The anchor hole 6 in the anchor box 1 is used for the stock, and the trompil size is processed the customization according to different stock diameters. The upper part of the anchor box 1 is covered with a PVC cover cap 2.

After the initial concrete spraying is completed in the tunnel excavation, the anchor rod is lofted, the anchor rod is drilled and grouted, the anchor rod 5 is installed, and the anchor box 1 is installed after the anchor rod 5 is installed and is temporarily fastened by bolts. And after fastening, covering a PVC cover cap 2 on the upper part, and spraying primary concrete again. After the primary concrete is sprayed again, after the strength of anchor rod anchoring slurry reaches the design and standard requirements, the upper PVC cap 2 is opened, the anchor rod bolt is fastened to the design and standard required torque by adopting a torque wrench, and mortar is filled in the anchor box 1.

Claims

1. A tunnel anchor rod base plate is characterized by comprising an anchor box (1) and a PVC (polyvinyl chloride) cap (2); the anchor box (1) is an integrally punched box-shaped component, the height of the anchor box is consistent with the re-spraying thickness, and the bottom of the anchor box is provided with an anchor hole (6) for an anchor rod (5) to pass through; the PVC cap (2) covers the top of the anchor box (1).

2. The tunnel anchor tie plate of claim 1, characterized in that the bottom of the anchor box (1) is provided with an upper recess, the anchor hole (6) being located centrally in the upper recess.

3. The tunnel anchor plate according to claim 1, characterized in that the inner diameter of the anchor hole (6) is determined according to the diameter of the anchor rod (5).