CN213580521U

CN213580521U - Experimental device for sprayed concrete under erosion action

Info

Publication number: CN213580521U
Application number: CN202021862562.4U
Authority: CN
Inventors: 左智刚; 陈涛; 唐海军; 赵晓东; 谢彤; 叶飞; 田崇明; 王坚; 赵猛; 何彪
Original assignee: China Railway Jianke Testing Co ltd; Changan University
Current assignee: China Railway Jianke Testing Co ltd; Changan University
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-06-29
Anticipated expiration: 2030-08-31

Abstract

An experimental device for sprayed concrete under the erosion action is characterized in that a water supply pipe supplies water to a water supply tank, a metering pump is arranged on the water supply pipe, the water supply tank is communicated with a concentration adjusting device through a hose, a miniature metering pump is arranged on the hose, at least 2 groups of water inlet pipes are arranged in the water supply tank, a water supply pump is arranged on the water inlet pipe, the water outlet end of the water inlet pipe is arranged in a test box, the end part of the water inlet pipe is provided with a seepage device, the sprayed concrete forms a test model during testing in the test box, the test box is arranged on a support of the test box, a side wall of the test box is provided with a water outlet pipe of the test box, the water outlet pipe of the; the utility model discloses can truly simulate groundwater seepage flow process, drain pipe crystallization jam process in just propping up the concrete, can popularize and apply to rich water area tunnel drainage system simulation experiment device field.

Description

Experimental device for sprayed concrete under erosion action

Technical Field

The utility model belongs to the technical field of tunnel engineering disease research, concretely relates to experimental apparatus of shotcrete under the erosion action.

Background

As a concealed project, a waterproof and drainage system of a highway tunnel plays an extremely important role in the safe operation of the tunnel. The problem that tunnel drainage systems in water-rich areas in the southwest of the west, such as Yunnan, Guizhou, Guangxi, Sichuan and the like, are blocked by crystalline objects is very serious, and the reason is that part of the water-rich areas are caused by surrounding rock fragments formed by scouring surrounding rocks in the seepage process of underground water, silt carried in the inflow tunnel of surface water and the like, most importantly, the tunnel sprayed concrete is lined in a complex physical-chemical process generated under the action of various erosion media, such as salt erosion, acid erosion, alkali erosion and the like, and the tunnel sprayed concrete can generate different types of crystals under the action of the erosion media. Along with the generation of a large amount of crystals, the alkali substances of the sprayed concrete can be greatly reduced, the hydration of the cement is gradually carried out under the alkaline condition, the progress of the hydration of the cement can be seriously influenced due to the loss of a large amount of alkali substances, and the strength of the sprayed concrete can be influenced, so that the safety of the whole lining is influenced.

The design of preventing and draining water of a tunnel in the design Specification of Highway tunnels (civil engineering part of the first book) issued by the ministry of transportation follows the principle of 'preventing, draining, intercepting and blocking combined, and comprehensive treatment according to local conditions', surface water and underground water are properly treated, and a water preventing and draining system inside and outside the tunnel is complete and smooth. The "drainage" means that surrounding rock water, surface water and the like entering the tunnel structure are discharged out of the tunnel through a tunnel drainage pipe, and due to the defect of the concrete, underground water enters the tunnel drainage pipe through seepage in the concrete. Concrete defects include pores, microcracks and macrocracks, typical values of total porosity of sprayed concrete are usually between 15% and 20%, the porosity of dry sprayed concrete is 8.7% greater than that of mold-injected concrete, and the porosity of wet sprayed concrete is 16% greater than that of mold-cast concrete. In the rich water tunnel, because water pressure effect, the tunnel is behind the shotcrete, and the country rock water can ooze through concrete water channel, and water channel comprises concrete hole and cement hydration in-process hydration passageway, and in water seepage flow in-process, can make water channel bigger and bigger moreover, produce more crack and macrocrack, the crack is more, and the loss of the calcium that faces is just more in the tunnel later stage operation in-process.

The utility model relates to a simulation shotcrete test device and method under the medium condition of erosion aims at providing certain reference for among southwest rich water area tunnel construction process drainage system design, shotcrete mix proportion design.

Disclosure of Invention

The utility model aims to solve the technical problem that overcome above-mentioned prior art not enough, provide a reasonable in design, simple structure, can more accurately simulate the injection concrete experimental apparatus under the erosion action of the injection concrete seepage flow condition in the tunnel.

The technical scheme for solving the technical problems is as follows: the utility model provides an experimental apparatus of spray concrete under the erosion action, the delivery pipe supplies liquid for the feed water tank, be provided with the measuring pump on the delivery pipe, the feed water tank is linked together through hose and concentration adjusting device, be provided with miniature measuring pump on the hose, be provided with 2 at least group's inlet tubes in the feed water tank, be provided with the working shaft on the inlet tube, the play water end of inlet tube sets up in the test box, the tip of inlet tube is provided with the seepage flow device, spray concrete formation test model during experimental in the test box, the test box sets up on the test box support, be provided with the test box outlet pipe on the lateral wall of test box, the test box outlet pipe is linked together with the drain pipe, the drain pipe is linked.

The utility model discloses an inlet tube connects into the U-shaped structure through the pipe joint by multistage PVC pipe, and the working shaft sets up in U-shaped structure bottom, and the working shaft lower part is provided with the water pump support.

The utility model discloses a inlet tube is close to proof box one end pipe diameter and reduces, and big pipe diameter PVC pipe is connected through transition joint with tubule footpath PVC pipe.

The utility model discloses a be provided with fixed joint on the relative lateral wall of proof box, the inlet tube penetrates the proof box from fixed joint, is provided with waterproof sheet rubber between fixed joint and the proof box.

The utility model discloses a proof box top is provided with sealed hole and rubber pad.

The utility model discloses a seepage flow device is four fens single shower nozzles.

The utility model discloses a drain pipe is semi-circular bellows.

The utility model discloses a drain pipe bottom is provided with telescopic bracket, and telescopic bracket's top is provided with the drain pipe fixation clamp and is fixed in telescopic bracket top with the drain pipe.

The utility model discloses a drain pipe lower part is provided with 2 at least groups telescopic bracket.

The utility model discloses a waste liquid delivery port is linked together with purifier.

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

1. the water supply pipe is connected with the metering pump, and the flow speed and the flow of the added deionized water are controlled by adjusting the size of the metering pump.

2. The test box is used for placing concrete, the concrete can be sprayed on site according to research content or poured indoors according to mix proportion and strength requirements, a seepage device is pre-buried in the test box before the concrete is poured or sprayed, and the seepage device is connected with a water supply pump through a fixed joint and a transition joint, so that the water seepage-drainage-crystallization process of the tunnel concrete is truly simulated.

3. During the rivers of proof box exit flowed into the drain pipe, the drain pipe passes through telescopic bracket and fixation clamp control elevation and is fixed, and the drain pipe can be dismantled, and length, slope all can set for according to the research content. The seepage crystallization problem in the tunnel can be researched by using a double-arm corrugated pipe commonly used for tunnel drainage pipes, and the disease treatment aspect of tunnel drainage pipe crystallization blockage can also be researched by using some novel drainage pipe materials or adding some special materials on the drainage pipes.

4. The test model is simple, the operability is strong, and the research of various working conditions can be carried out simultaneously according to the actual conditions.

5. Different erosion solutions can be added into the water supply tank according to research contents, the prepared high-concentration erosion solution is added into the concentration adjusting device in advance, and the high-concentration erosion solution is added into the water supply tank through a micro metering pump according to the required concentration.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a partially enlarged view of fig. 1.

In the figure: 1. a metering pump; 2. a water supply pipe; 3. a water supply tank; 4. a water inlet pipe; 5. a pipe joint; 6. a water supply pump; 7. a water pump support; 8. a test chamber; 9. a test box support; 10. a transition joint; 11. fixing the joint; 12. A waterproof rubber sheet; 13. a seepage device; 14. a rubber pad; 15. sealing the hole; 16. a water outlet pipe of the test box; 17. a drain pipe fixing clamp; 18. a drain pipe; 19. a telescoping support; 20. a water collection tank; 21. a waste liquid outlet; 22. a concentration adjusting device; 23. a micro metering pump; 24. a hose.

Detailed Description

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

Example 1

In fig. 1, 2, the utility model relates to an experimental apparatus of shotcrete under erosion action, solution supplies liquid for feed tank 3 through delivery pipe 2, can add different erosion solution according to the research content in the feed tank 3, install measuring pump 1 on the delivery pipe 2, measuring pump 1 can the accurate measurement let in the water yield in the feed tank 3, feed tank 3 is linked together through hose 24 and concentration control device 22, be provided with miniature measuring pump 23 on the hose 24, add the high concentration erosion solution that the pre-configuration was good in the concentration control device 22, add in feed tank 3 through miniature measuring pump 23 control according to required concentration.

Install 2 at least inlet tube 4 of group in the feed water tank 3, the group number of inlet tube 4 is confirmed according to the concrete test needs, the figure of inlet tube 4 is corresponding with the figure of feed water tank 3, install working shaft 6 on the inlet tube 4, working shaft 6 provides pressure of intaking for inlet tube 4, the inlet tube 4 of this embodiment connects into the U-shaped structure through pipe joint 5 by the multistage PVC pipe, working shaft 6 is installed in the U-shaped structure bottom, water pump support 7 is installed to 6 lower parts of working shaft, inlet tube 4 is close to 8 one end pipe diameters of proof box and reduces, big pipe footpath PVC pipe and little pipe footpath PVC pipe are connected through transition joint 10.

The play water end of inlet tube 4 installs in proof box 8, installs fixed joint 11 on the relative lateral wall of proof box 8, and inlet tube 4 penetrates proof box 8 from fixed joint 11, is provided with waterproof rubber piece 12 between fixed joint 11 and the proof box 8, and waterproof rubber piece 12 prevents to leak in the experimentation, and proof box 8 top is provided with sealed hole 15 and rubber pad 14, seals fixedly with the bolt during the experiment. The end of the water inlet pipe 4 is provided with a seepage device 13, and the seepage device 13 is a four-quarter single-nozzle. Spray concrete formation test model during experiment in proof box 8, seepage flow device 13 is pre-buried in proof box 8, the actual infiltration operating mode of a simulation tunnel primary shotcrete, proof box 8 is installed on proof box support 9, a side wall mounting of proof box 8 has proof box outlet pipe 16, proof box outlet pipe 16 is linked together with drain pipe 18, drain pipe 18 is semi-circular bellows, the bellows simulates the tunnel and indulges horizontal drain pipe operating mode, the bellows is semi-circular pipeline, be convenient for the interior settlement condition of discharge solution of visual observation drain pipe 18, drain pipe 18 can be according to the different materials of research change of research direction, the influence of the different material drain pipe material to the tunnel infiltration is researched. The bottom of the drain pipe 18 is provided with a telescopic bracket 19, and the top of the telescopic bracket 19 is provided with a drain pipe fixing clamp 17 for fixing the drain pipe 18 on the top of the telescopic bracket 19. Furthermore, at least 2 groups of telescopic supports 19 are installed at the lower part of the drain pipe 18, the height of the adjacent group of telescopic supports 19 is adjusted, the gradient of the drain pipe 18 can be adjusted, and the influence of the gradient on the seepage precipitation amount in an actual tunnel is simulated. The drain pipe 18 is communicated with a water collecting tank 20, the seepage solution of the device is drained into the water collecting tank 20, one end of the water collecting tank 20 is provided with a waste liquid outlet 21, and the waste water left in the test is drained. The waste liquid outlet 21 can be communicated with a purification device which carries out purification treatment on the test waste water.

Claims

1. The utility model provides an experimental apparatus of shotcrete under the erosion action which characterized in that: the water supply pipe (2) supplies liquid to the water supply tank (3), the water supply pipe (2) is provided with a metering pump (1), the water supply tank (3) is communicated with a concentration adjusting device (22) through a hose (24), the hose (24) is provided with a micro metering pump (23), at least 2 groups of water inlet pipes (4) are arranged in the water supply tank (3), the water inlet pipes (4) are provided with water supply pumps (6), the water outlet ends of the water inlet pipes (4) are arranged in a test box (8), the end parts of the water inlet pipes (4) are provided with seepage devices (13), a test model is formed by spraying concrete during test in the test box (8), the test box (8) is arranged on a test box support (9), one side wall of the test box (8) is provided with a test box (16), the water outlet pipe (16) of the test box is communicated with a water drain pipe (18), the water drain pipe, one end of the water collecting tank (20) is provided with a waste liquid outlet (21).

2. The experimental device for the sprayed concrete under the erosion action according to claim 1, wherein: the water inlet pipe (4) is connected into a U-shaped structure through a pipeline joint (5) by a plurality of sections of PVC pipes, the water supply pump (6) is arranged at the bottom of the U-shaped structure, and a water pump support (7) is arranged at the lower part of the water supply pump (6).

3. The experimental device for the sprayed concrete under the erosion action according to claim 2, wherein: the pipe diameter of one end, close to the test box (8), of the water inlet pipe (4) is reduced, and the large-pipe-diameter PVC pipe and the small-pipe-diameter PVC pipe are connected through the transition joint (10).

4. The experimental device for the sprayed concrete under the erosion action according to claim 3, wherein: the test box is characterized in that fixed joints (11) are arranged on opposite side walls of the test box (8), the water inlet pipe (4) penetrates into the test box (8) from the fixed joints (11), and waterproof rubber sheets (12) are arranged between the fixed joints (11) and the test box (8).

5. The experimental device for the sprayed concrete under the erosion action according to claim 1, wherein: the top of the test box (8) is provided with a sealing hole (15) and a rubber pad (14).

6. The experimental device for the sprayed concrete under the erosion action according to claim 1, wherein: the seepage device (13) is a four-way single-spraying nozzle.

7. The experimental device for the sprayed concrete under the erosion action according to claim 1, wherein: the drain pipe (18) is a semicircular corrugated pipe.

8. The experimental device for the sprayed concrete under the erosion action according to claim 1, wherein: the bottom of the drain pipe (18) is provided with a telescopic support (19), and the top of the telescopic support (19) is provided with a drain pipe fixing clamp (17) for fixing the drain pipe (18) to the top of the telescopic support (19).

9. The experimental device for the sprayed concrete under the erosion action according to claim 8, wherein: the lower part of the drainage pipe (18) is provided with at least 2 groups of telescopic brackets (19).

10. The experimental device for the sprayed concrete under the erosion action according to claim 1, wherein: the waste liquid outlet (21) is communicated with the purification device.