A test device for simulating single-tube grouting behind shield segment wall

Abstract

The present invention relates to the technical field of tunnel engineering, and is a test device for simulating single-tube grouting behind a shield segment wall, comprising: a fixed box and a mobile box slidably nested in the fixed box, a grouting hole for grouting is provided on the side of the mobile box, and a water injection hole is provided on the top of the fixed box, and the water injection hole is connected to the mobile box. The slurry enters the soil (solid medium) in the mobile box through the grouting hole and solidifies. According to the speed of increasing the volume of the slurry, the speed of the motor withdrawing the mobile box is adjusted, that is, the synchronous grouting process simulation is completed, and the set water pressure is added to the top plate of the fixed box as needed to simulate the synchronous grouting process of the underwater tunnel at different water pressures. Compared with the traditional synchronous grouting simulation device that simulates the process of grouting and excavating from the "shield shell" to the external soil, this scheme focuses more on and is conducive to simulating the diffusion of the slurry after the grouting of the segment wall is completed, which is of great significance for exploring the diffusion law of the slurry after the grouting of the segment.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel engineering, and in particular to a test device for simulating single-tube grouting behind a shield segment wall. Background Art

[0002] During shield tunneling, synchronous grouting is carried out through the synchronous grouting system and the grouting pipe at the tail of the shield, while the shield is advancing forward to form the gap behind the segment. Synchronous grouting fills the gap behind the segment in a very short time after it is formed, so that the surrounding rock mass can obtain timely support, which can effectively prevent the collapse of the rock mass and control the settlement of the surface.

[0003] Compared with the continuous development of grouting construction technology, the research on grouting diffusion reinforcement mechanism is relatively lagging behind. At present, the grouting effect still relies heavily on empirical technology, and there is little research on the law of grouting slurry penetration and diffusion. The existing slurry diffusion reinforcement theoretical formula is far from mature, and some empirical formulas are often summarized for certain specific slurries and are not representative.

[0004] Single-tube grouting is a grouting method in which only one grouting hole is used behind the wall of the pipe segment for grouting. The study on the flow and diffusion mechanism of the slurry in the injected medium after single-tube grouting is relatively simple and has more guiding significance for actual engineering. Currently, there is a lack of test equipment to simulate the influence of slurry, grouting pressure, water and soil pressure on the grouting effect of single-tube grouting. Summary of the invention

[0005] The invention provides a test device for simulating single-tube grouting behind a shield segment wall, which solves the above-mentioned technical problem that the grouting effect can only rely on experience.

[0006] In order to solve the above technical problems, the present invention provides a test device for simulating single-tube grouting behind the wall of a shield segment, comprising: a fixed box body and a movable box body that can be slidably nested in the fixed box body, the side of the movable box body is provided with grouting holes for grouting, and the top of the fixed box body is provided with a water injection hole, and the water injection hole is connected to the movable box body.

[0007] Preferably, the tops of the fixed box body and the movable box body are both in an open state, a detachable cover plate is provided on the fixed box body, and the water injection hole is located on the cover plate.

[0008] Preferably, a rotating shaft is provided at the upper end of the side wall of the fixed box body, and the cover plate is flip-connected with the side wall via the rotating shaft.

[0009] Preferably, a track is fixedly provided below the fixed box, a gear and a motor are fixedly provided on the movable box, the gear is meshed with the track, and the motor drives the gear to rotate to drive the movable box and the fixed box to slide relative to each other.

[0010] Preferably, a plurality of grouting holes arranged in a ring are provided on the side of the movable box.

[0011] Preferably, the device further comprises an air compressor and a slurry pool, the outer side of the grouting hole is connected to a grouting hose, and the other end of the grouting hose is connected to the air compressor and the slurry pool.

[0012] Preferably, soil is arranged in the movable box, and the slurry encounters the soil and solidifies.

[0013] Preferably, the inner side of the grouting hole is connected to a grouting steel pipe.

[0014] Beneficial effects: The present invention provides a test device for simulating single-tube grouting behind the wall of a shield segment, comprising: a fixed box and a mobile box slidably nested in the fixed box, the side of the mobile box is provided with a grouting hole for grouting, the top of the fixed box is provided with a water injection hole, and the water injection hole is connected to the mobile box. During grouting, an air compressor injects high-pressure air into the grouting pipe, and the slurry in the slurry pool is sucked in through the internal and external pressure difference. The slurry enters the soil (solid medium) in the mobile box through the grouting hole in the grouting pipe and solidifies. According to the speed of increasing the volume of the slurry, the speed of the motor to withdraw the mobile box is adjusted to complete the simulation of the synchronous grouting process. According to the needs, the set water pressure is added to the top plate of the fixed box to simulate the synchronous grouting process of the underwater tunnel under different water pressures. After the test is completed, the cover of the fixed box can be opened to facilitate slicing of the soil and observe the grouting diffusion effect. A combination of fixed and mobile boxes is adopted, and the mobile box is pulled out according to the grouting volume. Compared with the traditional synchronous grouting simulation device that simulates the process of grouting and excavating from the "shield shell" to the external soil, this scheme focuses more on and is conducive to simulating the diffusion of slurry after the grouting of the segment wall is completed, which is of great significance for exploring the diffusion law of slurry after grouting of the segment.

[0015] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 It is a schematic structural diagram of the test device for simulating single-tube grouting behind the shield segment wall of the present invention.

[0018] Explanation of the reference numerals: 11 - fixed housing; 12 - movable housing; 13 - rotating shaft; 21 - motor; 22 - rotating gear; 31 - track; 41 - grouting hose; 42 - grouting steel pipe; 43 - grouting hole; 51 - air compressor; 61 - slurry pool; 71 - water injection pipe. DETAILED DESCRIPTION

[0019] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0020] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0022] like Figure 1As shown, the present invention provides a test device for simulating single-tube grouting behind the wall of a shield segment, comprising: a fixed box 11 and a mobile box 12 that can be slidably nested in the fixed box 11, the side of the mobile box 12 is provided with a grouting hole 43 for grouting, and a water injection hole is provided above the fixed box 11, and the water injection hole is connected to the mobile box 12. During grouting, the air compressor 51 injects high-pressure air into the grouting pipe, and the slurry in the slurry pool 61 is sucked in through the internal and external pressure difference. The slurry enters the soil (solid medium) in the mobile box 12 through the grouting hole 43 in the grouting pipe and solidifies. According to the speed of increasing the volume of the slurry, the speed of the motor 21 to extract the mobile box 12 is adjusted, that is, the synchronous grouting process simulation is completed, and the set water pressure is added to the top plate of the fixed box 11 as needed to simulate the synchronous grouting process of the underwater tunnel under different water pressures. After the test is completed, the cover of the fixed box 11 can be opened to facilitate slicing of the soil and observe the grouting diffusion effect. A fixed box 11 and a movable box 12 are combined, and the movable box 12 is pulled out according to the grouting volume. Compared with the traditional synchronous grouting simulation device that simulates the process of grouting and excavating from the "shield shell" to the external soil, this scheme focuses more on and is conducive to simulating the diffusion of slurry after the grouting of the segment wall is completed, which is of great significance for exploring the diffusion law of slurry after grouting of the segment.

[0023] In a preferred solution, the tops of the fixed box 11 and the movable box 12 are both open, and a detachable cover is provided on the fixed box 11, and the water injection hole is located on the cover. A semi-open box is adopted, and the cover can be opened from the top, which is convenient for slicing or further research of the grouting soil after the test, and the slurry diffusion morphology can be observed intuitively. The cover is provided with a water injection hole, and the water pressure of the box can be adjusted to simulate the single-tube grouting process under different strata and different water pressures.

[0024] In a preferred solution, a rotating shaft 13 is provided at the upper end of the side wall of the fixed box body 11, and the cover plate is flipped and connected to the side wall through the rotating shaft 13. The rotating shaft 13 is easy to open and close and is convenient to use.

[0025] In a preferred solution, a track 31 is fixedly provided below the fixed box 11, and a gear and a motor 21 are fixedly provided on the mobile box 12. The gear is meshed with the track 31, and the motor 21 drives the gear to rotate to drive the mobile box 12 to slide relative to the fixed box 11. The fixed box 11 and the mobile box 12 are combined, and the speed of the motor 21 is controlled according to the grouting amount to synchronously withdraw the mobile box 12. Compared with the traditional synchronous grouting simulation device that simulates the process of grouting and excavating from the "shield shell" to the external soil, it focuses more on and is conducive to simulating the diffusion of the slurry after the grouting of the pipe segment wall is completed, which is of great significance for exploring the slurry diffusion law after the grouting of the pipe segment.

[0026] In a preferred solution, a plurality of grouting holes 43 arranged in an annular manner are provided on the side of the mobile box 12. The device further comprises an air compressor 51 and a slurry tank 61. The outer side of the grouting holes 43 is connected to a grouting hose 41, and the other end of the grouting hose 41 is connected to the air compressor 51 and the slurry tank 61. Soil is provided in the mobile box 12, and the slurry encounters the soil and solidifies.

[0027] In a preferred embodiment, the inner side of the grouting hole 43 is connected to a grouting steel pipe 42. The outer side is connected to the air compressor 51 and the slurry pool 61 through a grouting hose 41, and the inner side is injected with slurry through the grouting steel pipe 42, so that the slurry can be fixedly discharged into any point of the mobile box 12.

[0028] In a specific implementation scenario, the mobile soil box includes a fixed box 11 and a mobile box 12. The fixed box 11 is a rectangular box, lacking a side panel on one side of the short side, and the cover on the top surface can be opened along the long side. A water injection pipe 71 is provided on the side of the cover near the rotating shaft 13. The mobile box 12 is nested inside the fixed box 11, and slides in and out from the side of the fixed box 11 lacking a short side. It is also a rectangular box, lacking a top plate and a side panel on one side of the short side, and the missing side panel is directly opposite to the missing side panel of the fixed box. Two motors 21 are installed at the lower part of the side panel near the outside of the mobile box 12, fixedly installed in symmetrical positions, and the motor 21 is provided with a rotating gear 22. Two tracks 31 with gears are provided below the long side direction of the fixed box 11, and the track 31 corresponds to the motor 21 up and down. The rotating gear 22 of the motor 21 is engaged with the track 31, and the top surface of the track 31 is lower than the plane height of the floor of the fixed box 11, that is, the fixed box 11 is located above the track 31. During operation, the motor 21 rotates through the gears to move the mobile box 12 toward the outside of the fixed box 11. There are also 10 grouting holes 43 evenly arranged in a ring above the motor 21 on the outer side plate of the mobile box 12, and a grouting hole 43 is arranged at the center of the side plate. During operation, the grouting hole positions are set, and the grouting steel pipes 42 are installed inside the grouting hole 43 box. The grouting holes 43 that are not grouted are blocked with plugs. The grouting hoses 41 are connected to the outside of the grouting holes 43, and the other end of the grouting hoses 41 are connected to the air compressor 51 and the slurry tank 61. The specific working principle is as follows:

[0029] During grouting, the air compressor 51 injects high-pressure air into the grouting hose 41, and the slurry in the slurry pool 61 is sucked in through the internal and external pressure difference. The slurry enters the soil (solid medium) in the mobile box 12 through the grouting hole 43 in the grouting hose 41 and solidifies. According to the speed of increasing the slurry volume, the speed of the motor 21 to withdraw the mobile box 12 is adjusted to complete the simulation of the synchronous grouting process. As needed, the set water pressure is added to the cover plate of the fixed box 11 through the water injection hole 71 to simulate the synchronous grouting process of the underwater tunnel under different water pressures.

[0030] The advantages over existing technologies are mainly reflected in:

[0031] (1) The present invention provides a test device for simulating single-tube grouting behind the shield segment wall, which adopts a combination of a fixed box and a movable box, and pulls out the movable box according to the grouting amount. Compared with the traditional synchronous grouting simulation device that simulates the process of grouting and excavating from the "shield shell" to the external soil, the present invention focuses more on and is conducive to simulating the diffusion of slurry after the grouting behind the segment wall is completed, which is of great significance for exploring the diffusion law of slurry after grouting of the segment.

[0032] (2) The present invention provides a test device for simulating single-tube grouting behind a shield segment wall. The box body has an openable top cover plate, which is convenient for slicing or further studying the grouting soil after the test and can intuitively observe the slurry diffusion pattern. The cover plate is provided with water injection holes, which can adjust the water pressure of the box body to simulate the single-tube grouting process under different strata and different water pressures.

[0033] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A test device for simulating single-tube grouting behind a shield segment wall, characterized in that: include: A fixed box body and a mobile box body that can be slidably nested in the fixed box body, the side of the mobile box body is provided with grouting holes for grouting, the top of the fixed box body is provided with a water injection hole, and the water injection hole is connected to the mobile box body; the tops of the fixed box body and the mobile box body are both open, the fixed box body is provided with a detachable cover plate, and the water injection hole is located on the cover plate; the splicing ends of the fixed box body and the mobile box body are both open, and the side of the mobile box body is provided with a plurality of grouting holes arranged in a ring, the inner side of the grouting hole is connected to a grouting steel pipe, and the grouting steel pipe extends into the mobile box body.

2. The test device for simulating single-tube grouting behind the shield segment wall according to claim 1 is characterized in that: A rotating shaft is arranged at the upper end of the side wall of the fixed box body, and the cover plate is flip-connected with the side wall via the rotating shaft.

3. The test device for simulating single-tube grouting behind the shield segment wall according to claim 1 is characterized in that: A track is fixedly arranged below the fixed box body, a gear and a motor are fixedly arranged on the movable box body, the gear is meshed with the track, and the motor drives the gear to rotate to drive the movable box body and the fixed box body to slide relative to each other.

4. The test device for simulating single-tube grouting behind the shield segment wall according to claim 1 is characterized in that: The device also includes an air compressor and a slurry pool. The outer side of the grouting hole is connected to a grouting hose, and the other end of the grouting hose is connected to the air compressor and the slurry pool.

5. The test device for simulating single-tube grouting behind the shield segment wall according to claim 4 is characterized in that: The movable box is provided with soil, and the slurry encounters the soil and solidifies.

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