CN217233591U

CN217233591U - Crystallization blockage preventing drainage system for karst water-rich tunnel

Info

Publication number: CN217233591U
Application number: CN202221032596.XU
Authority: CN
Inventors: 叶飞; 田崇明; 任超; 同月苹; 王坚; 姜寅; 张俊元; 张兴冰; 韩兴博
Original assignee: Changan University
Current assignee: Changan University
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-08-19
Anticipated expiration: 2032-04-29

Abstract

The utility model provides a karst rich water tunnel prevents crystallization and blocks up drainage system, include annular drain pipe, longitudinal drain pipe, horizontal leading water pipe, reserve notes sour pipe and central drain pipe, annular drain pipe's bottom intercommunication longitudinal drain pipe, longitudinal drain pipe passes through horizontal leading water pipe intercommunication central drain pipe, reserve notes sour pipe and set up side by side central drain pipe top and intercommunication central drain pipe. The utility model discloses a can prevent karst rich water tunnel drainage system crystallization and block up, greatly promoted tunnel engineering's construction, design level to effectively reduce the operation maintenance cost in tunnel.

Description

Crystallization blockage preventing drainage system for karst water-rich tunnel

Technical Field

The utility model belongs to the technical field of tunnel engineering and specifically relates to a crystallization blockage prevention drainage system is prevented in rich water tunnel of karst.

Background

Drainage system in mountain tunnel generally adopts "annular drainage blind pipe-longitudinal drain pipe-drainage side ditch-central drainage ditch" design, to normal geological conditions and not rich in the tunnel of groundwater, the drainage demand of tunnel construction and operation can be satisfied in this kind of drainage system's design, but the abundant water tunnel in karst district not only need consider the drainage demand, need consider the tunnel crystallization jam problem that unfavorable geology brought simultaneously, and original tunnel drainage system no longer is suitable for.

The problem of tunnel crystallization is that underground water dissolves and carries out easily soluble calcium compounds in surrounding rocks and concrete in the seepage process of the surrounding rocks and primary support concrete of the tunnel, so that the underground water is gathered in a tunnel drainage side ditch to cause blockage. The underground water after the seepage of the surrounding rock and the primary support usually directly enters the drainage side ditch, so that the crystallization blockage in the tunnel is most easy to occur, the most serious blockage region is the drainage side ditch, and once the drainage side ditch is blocked, the longitudinal drainage pipe of the underground water is deposited after the drainage function of the side ditch is failed, so that the longitudinal drainage pipe and the annular drainage blind pipe are gradually blocked.

The existing research at home and abroad shows that the crystal for blocking the drainage pipeline is calcium carbonate generated by dissolving calcium in a calcium hydroxide framework in concrete, and the hardness of the calcium carbonate crystal is gradually hardened along with the increase of crystallization time. The calcium in the concrete can not be prevented from flowing out on the premise of not changing the concrete material, so the prevention of the crystal blockage can prevent the formation process from the crystal to the blockage instead of the generation process of the crystal by means of the aggregation of the crystal.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that exists among the background art, the utility model provides a crystallization blocking prevention drainage system is prevented in rich water tunnel of karst.

The technical scheme for solving the technical problems is as follows:

the utility model provides a karst rich water tunnel prevents crystallization and blocks up drainage system, includes annular drain pipe, longitudinal drain pipe, horizontal leading water pipe, reserves notes sour pipe and central drain pipe, the bottom intercommunication of annular drain pipe longitudinal drain pipe, longitudinal drain pipe passes through horizontal leading water pipe intercommunication central drain pipe, reserve notes sour pipe and set up side by side central drain pipe top and intercommunication central drain pipe.

Based on the above, the annular drain pipe is a semi-blind drain pipe, the longitudinal drain pipe and the transverse water diversion pipe are blind drain pipes, and the reserved acid injection pipe and the central drain pipe are respectively PVC pipes.

Based on the above, a plurality of acid injection holes are uniformly distributed at the bottom of the reserved acid injection pipe and are communicated with the central drain pipe.

Based on the above, one end of the reserved acid injection pipe is closed, and the other end of the reserved acid injection pipe is communicated with the acid pump through a valve.

Based on the above, the downward slope of the transverse water conduit from the longitudinal water discharge pipe to the central water discharge pipe is 25 degrees.

Based on the above, the outside of the longitudinal drainage pipe is reversely wrapped with the geotextile and the waterproof board.

Compared with the prior art, the utility model has the following advantages:

the utility model discloses a change arranging and the design of drain pipe form and increase drain pipe slope, increase drainage flow and water velocity as far as possible in order to reduce the crystalline substance gathering to the emergence of prevention jam has greatly promoted tunnel engineering's construction, design level, and effectively reduces the operation maintenance cost in tunnel.

Drawings

Fig. 1 is a schematic cross-sectional view of the arrangement of the drainage system of the present invention.

Fig. 2 is a detail construction diagram of the joint and the acid injection pipe of the drainage system of the invention.

Description of reference numerals: 1. an annular drain pipe; 2. a transverse water conduit; 3. a central drain pipe; 4. reserving an acid injection pipe; 5. a longitudinal drain pipe; 6. a three-way pipe; 7. and (4) a small hole.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, but the present invention is not limited to these examples.

The utility model discloses aim at with the interior (carriageway region) drainage of karst rich water tunnel hole and the outer moisture separation of drainage of lining cutting, the crystallization is concentrated the way of dealing with, reaches the purpose of administering tunnel drainage crystallization jam. The drainage system mainly comprises an annular drainage semi-blind pipe, geotextile, a waterproof board, a longitudinal drainage pipe, a transverse water conduit, a reserved acid injection pipe and a central drainage pipe. The water flow direction of the tunnel underground water is annular drainage semi-blind pipe/geotextile and waterproof board, longitudinal drain pipe, transverse water conduit pipe, central drain pipe and outside the tunnel.

As shown in figure 1, annular drainage semi-blind pipes are annularly arranged on the inner side of a tunnel close to a primary support, a phi 160 semicircular spring drainage pipe is adopted and is arranged close to the primary support, the arrangement surface of the primary support is treated to be smooth approximately before the annular drainage semi-blind pipes are arranged, and the annular drainage semi-blind pipes are arranged along the longitudinal direction of the tunnel by 2-4 meters.

Annular blind pipe construction to the side wall bottom, meets with longitudinal drain pipe 5, like fig. 2, longitudinal drain pipe 5 adopts phi 160 upper limit bellows that punches, buries the installation drain pipe during the construction according to the design positioning line underground, with longitudinal drain pipe 5 turn-ups behind geotechnological cloth and the waterproof board construction, has the space department to fill with the gravel in the middle of longitudinal drain pipe 5 department geotechnological cloth and the first support.

As figure 2, vertical drain pipe 5 links to each other with horizontal leading pipe 2 with three-way pipe 6, for reducing the interior rock water of horizontal leading pipe 2 and piling up, the design is different with the interior drainage design of tunnel in the past here, cancel the longitudinal drainage ditch under the side wall, and horizontal leading pipe 2 slope is 25 in this embodiment, also is the contained angle of horizontal leading pipe 2 and horizontal plane 25, along the rivers that annular drain pipe 1 flows down flow into horizontal leading pipe 2 along vertical drain pipe 5, the rock water flows into central drain pipe 3 in with great hydraulic gradient.

The transverse water guide pipe 2 is well positioned before concrete is filled on the upper portion of the inverted arch for pouring (the positioning can be realized by adopting a welded steel bar support), the pipe fittings are protected in the concrete pouring process, and the lower portion of the transverse water guide pipe 2 extends into the interior of the suspended formwork of the central drain pipe 3. The transverse water conduit 2 adopts phi 160 corrugated pipe, one end of the transverse water conduit is connected with the longitudinal water drainage pipe 5 by a tee joint, and the other end is connected into the central water drainage pipe 3.

The central drain pipe 3 is a phi 500PVC hard pipe, the side wall of the central drain pipe is provided with an opening, the opening is connected with the transverse water conduit 2, each section is 6-9 meters, and the interface of the central drain pipe and the transverse water conduit 2 is hot-melted by a polyethylene heat shrinkable sleeve so as to improve the waterproof performance of the interface. The central drain pipe 3 is placed in a central drainage ditch, the space between the drain pipes and the drainage ditch is filled with medium coarse sand to protect pipelines, and the top of the central drain pipe 3 is provided with an acid injection pipe. The reserved acid injection pipe 4 is a PVC phi 10 plastic pipe, the acid injection pipe is fixed at the top of the central drain pipe 3 through a clamping groove, and small holes 7 are uniformly formed in the lower part of the acid injection pipe so as to facilitate the ejection of acid from the small holes 7; the inlet end of the acid injection pipe is provided with a movable joint and a control valve, the movable joint can be connected with an acid pump, and the control valve can control the flow and the flow velocity of the injected acid; and the outlet section of the acid injection pipe is plugged by a plug so as to ensure the dissolution effect of acid.

Claims

1. The utility model provides a crystallization blocking prevention drainage system is prevented in rich water tunnel of karst which characterized in that: the water-saving sewage treatment device comprises an annular water drainage pipe (1), a longitudinal water drainage pipe (5), a transverse water diversion pipe (2), a reserved acid injection pipe (4) and a central water drainage pipe (3), wherein the bottom of the annular water drainage pipe (1) is communicated with the longitudinal water drainage pipe (5), the longitudinal water drainage pipe (5) is communicated with the central water drainage pipe (3) through the transverse water diversion pipe (2), and the reserved acid injection pipe (4) is arranged at the top of the central water drainage pipe (3) in parallel and is communicated with the central water drainage pipe (3).

2. The karst rich water tunnel crystallization-blockage-preventing drainage system of claim 1, wherein: the annular drainage pipe (1) is a semi-blind drainage pipe, the longitudinal drainage pipe (5) and the transverse water diversion pipe (2) are drainage blind pipes, and the reserved acid injection pipe (4) and the central drainage pipe (3) are respectively PVC pipes.

3. The karst rich water tunnel crystallization-blockage-preventing drainage system of claim 1, wherein: a plurality of acid injection holes are uniformly distributed at the bottom of the reserved acid injection pipe (4), and the acid injection holes are communicated with the central drain pipe (3).

4. The karst rich water tunnel crystallization-blockage-preventing drainage system of claim 1, wherein: one end of the reserved acid injection pipe (4) is closed, and the other end of the reserved acid injection pipe (4) is communicated with an acid pump through a valve.

5. The karst rich water tunnel crystallization-blockage-preventing drainage system of claim 1, wherein: the downward inclination of the transverse water conduit (2) from the longitudinal water discharge pipe (5) to the central water discharge pipe (3) is 25 degrees.

6. The karst water-rich tunnel crystallization blockage prevention drainage system according to claim 1, characterized in that: the longitudinal drain pipe (5) is reversely wrapped with geotextile and waterproof boards.