Testing device for simulating tunnel segmented grouting

Abstract

The utility model relates to a test device for simulating tunnel segmented grouting, and belongs to the technical field of tunnel engineering model tests.The test device comprises a driving part, a grouting device and a model box comprising a loading device.The driving part communicates with the grouting device through a first gas conveying pipe and a second gas conveying pipe; the grouting device comprises a first slurry storage tank, a second slurry storage tank, a first slurry conveying pipe, a second slurry conveying pipe and a grouting piece, wherein the first slurry conveying pipe and the second slurry conveying pipe are communicated with the model box. According to the test device for simulating tunnel segmented grouting, the grouting pipe is divided into the A part, the B part and the C part by the partition plates, grout in the grouting pipe can be controlled to flow into different cavities by changing the gear position of the grouting rotating baffle of the grouting pipe, and then the tunnel grouting position can be controlled, so that segmented grouting simulation of similar material strata is achieved; therefore, the simulation of grouting reinforcement and excavation of the tunnel stratum is realized, and then the grouting reinforcement effect of the tunnel stratum is researched by monitoring the tunnel excavation process.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel engineering model testing, and in particular to a testing device for simulating segmented grouting of tunnels. Background Art

[0002] In the past decade, transportation infrastructure has been continuously improved. As an important part of transportation infrastructure, the number and length of transportation tunnels have also developed rapidly.

[0003] During the construction process of a traffic tunnel, it is inevitable to encounter conditions such as poor geological structure, low rock strength and high groundwater level. These geological conditions will reduce the strength and stability of the tunnel surrounding rock, making the tunnel surrounding rock unsuitable for direct construction. In order to ensure the safety of tunnel construction, the tunnel stratum needs to be reinforced. The stratum reinforcement methods include anchor reinforcement, anchor cable reinforcement and grouting reinforcement. The most commonly used reinforcement method is grouting reinforcement of the stratum.

[0004] In order to formulate a grouting reinforcement plan and check the effect of grouting reinforcement, it is often necessary to use experimental means. However, the size of the tunnel project is relatively large, and it is difficult to conduct on-site tests. At this time, model tests are needed to study the tunnel grouting reinforcement parameters and reinforcement effects.

[0005] In the past, most test devices for simulating tunnel grouting used grouting simulation after excavation was completed, or directly used the method of changing the strength of similar materials to simulate the reinforced tunnel stratum. These are inconsistent with the construction sequence of first grouting the reinforced stratum in advance and then implementing tunnel excavation in actual projects. They cannot achieve good simulation results and are difficult to provide guidance for the construction of actual projects. Therefore, we propose a test device for simulating segmented tunnel grouting to solve the above problems. Utility Model Content

[0006] In response to the deficiencies of the prior art, the present application provides a test device for simulating segmented tunnel grouting, which has the advantages of being able to simulate tunnel grouting before excavation and intuitively observe the differences in tunnel surrounding rock deformation during excavation.

[0007] To achieve the above-mentioned objectives, the present application provides the following technical solutions: a test device for simulating segmented grouting of a tunnel, comprising a driving member, a grouting device, and a model box including a loading device, wherein the driving member and the grouting device are connected via a first air pipe and a second air pipe;

[0008] The grouting device includes a first slurry storage tank, a second slurry storage tank, a first slurry delivery pipe and a second slurry delivery pipe connected to the model box, and a grouting piece;

[0009] The grouting part includes a grouting pipe cover, a grouting rotating baffle, a grouting diverter and a grouting pipe shell that are movably connected as one body. The grouting pipe cover is provided with an arc track and an input port. The grouting rotating baffle is a symmetrical fan blade structure and a screw hole is provided in the center. The center screw hole of the grouting rotating baffle corresponds to the grouting pipe cover. A disc handle is also provided on the fan-shaped surface of the grouting rotating baffle, and the disc handle corresponds to the arc track provided on the grouting pipe cover.

[0010] The grouting diverter consists of an upper disc and a lower guide pipe. The surface of the grouting pipe shell is provided with evenly distributed holes, and a partition plate is provided inside to distribute the internal space of the grouting pipe shell into three parts.

[0011] Furthermore, valves and pressure gauges are provided on the outsides of the first propeller delivery pipe and the second propeller delivery pipe connected to the model box.

[0012] Furthermore, the driving component includes an air compressor body, the compressed air outlet end of the air compressor body is connected to the first air pipe and the second air pipe, and valves should be provided on the outside of the first air pipe and the second air pipe.

[0013] Furthermore, the grouting diverter has several guide pipes, and the lengths of the guide pipes are different. A screw hole is provided in the center of the disc for corresponding connection with the rotating baffle of the grouting pipe. The disc of the grouting diverter has an external thread, and the upper part of the grouting pipe shell is provided with an internal thread corresponding to the disc of the grouting diverter, and is connected to the grouting pipe shell through the thread.

[0014] Furthermore, the model box includes a model box front baffle, a model box rear baffle, a first side panel, and a second side panel to form a rectangular box body with an upper opening, wherein the surfaces of the first side panel and the second side panel have multiple rows of exhaust holes.

[0015] Furthermore, the loading device includes a loading frame and a first jack and a second jack located on the loading frame.

[0016] Furthermore, the loading frame is welded to the outside of the model box, and a movable loading beam is slidably mounted on the loading frame, and the first jack and the second jack are both fixedly mounted on the loading beam.

[0017] Furthermore, a locking structure should be installed between the loading beam and the loading frame to limit the position of the loading beam after sliding.

[0018] Compared with the existing technology, the technical solution of this application has the following beneficial effects:

[0019] The test device for simulating segmented grouting of tunnels has a grouting pipe divided into three parts A, B, and C by a partition. By changing the gear position of the grouting rotating baffle of the grouting pipe, the slurry in the grouting pipe can be controlled to flow into different cavities, and then the position of the tunnel grouting can be controlled, thereby realizing the segmented grouting simulation of similar material strata, and then realizing the simulation of grouting reinforcement of tunnel strata before excavation. Then, by monitoring the tunnel excavation process and studying the grouting reinforcement effect of the tunnel stratum, the actual engineering situation can be better simulated; by adding different slurries into the two slurry storage tanks, different types of slurries can be injected into the same stratum, and subsequently the performance difference between different slurries can be studied by monitoring the excavation process. This not only can more intuitively observe the difference in deformation of the tunnel surrounding rock during the excavation process, but also effectively avoid the influence of factors such as the difference in properties of similar strata before and after and the difference in layout of test instruments on the test results in the two grouting tests, and obtain more accurate test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an overall schematic diagram of a test device for simulating segmented tunnel grouting according to the present invention;

[0021] Figure 2 This is a structural diagram of the grouting pipe upper cover of the grouting pipe of the utility model;

[0022] Figure 3 This is a structural diagram of a grouting rotating baffle of a grouting pipe of the present invention;

[0023] Figure 4 This is a structural diagram of a grouting diverter of a grouting pipe of the present utility model;

[0024] Figure 5 This is a structural diagram of the grouting pipe shell of the grouting pipe of the utility model;

[0025] Figure 6 for Figure 1 Schematic diagram of the structure of the connection part between the middle slurry storage tank and the slurry delivery pipe (point A).

[0026] In the figure: 1. driving member; 11. air compressor body; 12. first air pipe; 13. second air pipe; 2. grouting device; 21. first slurry storage tank; 22. second slurry storage tank; 23. first slurry delivery pipe; 24. second slurry delivery pipe; 25. grouting member; 251. grouting pipe upper cover; 252. grouting rotating baffle; 253. grouting diverter; 254. grouting pipe shell; 3. model box; 31. model box front baffle; 32. model box rear baffle; 33. first side panel; 34. second side panel; 35. loading frame; 36. loading beam; 37. first jack; 38. second jack. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0028] See also Figures 1 to 6 In this embodiment, a test device for simulating segmented grouting of a tunnel includes a driving member 1, a grouting device 2, and a model box 3 including a loading device, wherein the driving member 1 and the grouting device 2 are connected through a first air pipe 12 and a second air pipe 13.

[0029] Preferably, the grouting device 2 includes a first slurry storage tank 21, a second slurry storage tank 22, a first slurry delivery pipe 23 and a second slurry delivery pipe 24 connected to the model box 3, and a grouting part 25. The first slurry storage tank 21 and the second slurry storage tank 22 are mainly used to store grouting liquid and are used for grouting under internal pressurized state.

[0030] Please refer to the instruction manual Figure 6 As shown, valves and pressure gauges are provided outside the first propeller pipe 23 and the second propeller pipe 24 connected to the model box 3.

[0031] With this design, the slurry output of each grouting pipe can be controlled by the valve, and the grouting progress can be judged in combination with the pressure gauge value.

[0032] In this embodiment, the driving member 1 includes an air compressor body 11, wherein the air compressor body 11 is used to provide power, and the compressed air outlet end of the air compressor body 11 is connected to the first air pipe 12 and the second air pipe 13, and is used to controllably deliver compressed air to the interior of the first slurry storage tank 21 and the second slurry storage tank 22.

[0033] Likewise, valves should be provided on the outside of the first gas pipe 12 and the second gas pipe 13 to improve the output effect of the compressed gas.

[0034] It should be noted that the grouting component 25 includes a grouting pipe upper cover 251, a grouting rotating baffle 252, a grouting diverter 253 and a grouting pipe shell 254 that are movably connected as one body. The grouting component mainly plays the role of guiding the inflow of slurry.

[0035] Please refer to the instruction manual Figure 2-3It should be noted that an arc-shaped track and an input port are provided on the grouting pipe cover 251. The grouting rotating baffle 252 is a symmetrical fan blade structure with a screw hole in the center. The center screw hole of the grouting rotating baffle 252 corresponds to the grouting pipe cover 251, so that the grouting rotating baffle 252 and the grouting pipe cover 251 can be conveniently connected as a whole by bolts, and can rotate with each other.

[0036] Specifically, a disc handle is provided on the fan-shaped surface of the grouting rotating baffle 252, which corresponds to the arc track provided on the grouting pipe cover 251, so as to facilitate adjustment of the position of the grouting rotating baffle 252 corresponding to the grouting pipe cover 251.

[0037] Please refer to the instruction manual Figure 4 In this embodiment, the grouting diverter 253 consists of an upper disc and a lower guide tube, wherein the number of the guide tubes is several and the lengths of the guide tubes are different. A screw hole is provided in the center of the disc for corresponding connection with the grouting pipe rotating baffle 252. The outside of the disc of the grouting diverter 253 has an external thread, which is connected to the grouting pipe shell 254 through the thread, so that the structure can form a whole.

[0038] Please refer to the instruction manual Figure 5 In this embodiment, the upper part of the grouting pipe shell 254 is provided with an internal thread corresponding to the disc of the grouting diverter 253, the surface of the grouting pipe shell 254 is provided with evenly distributed holes, and a partition plate is provided inside to distribute the internal space of the grouting pipe shell 254 into three parts. The partition plate is provided with a circular hole to facilitate the insertion of guide pipes of different lengths of the grouting diverter 253.

[0039] The model box 3 in this embodiment includes a front baffle 31, a rear baffle 32, a first side panel 33, and a second side panel 34 to form a rectangular box body with an upper opening, wherein the surfaces of the first side panel 33 and the second side panel 34 have multiple rows of exhaust holes, and the front baffle 31 of the model box has grouting holes for the grouting parts 25 to extend into the model box 3.

[0040] In this embodiment, the loading device includes a loading frame 35 and a first jack 37 and a second jack 38 located on the loading frame 35 .

[0041] Specifically, the loading frame 35 is welded to the outside of the model box 3, and a movable loading beam 36 is slidably installed on the loading frame 35. The first jack 37 and the second jack 38 are both fixedly installed on the loading beam 36 for applying pressure after movement to simulate excavation.

[0042] It should be noted that a locking structure should be installed between the loading beam 36 and the loading frame 35 to limit the position of the loading beam 36 after sliding.

[0043] The working principle of the above embodiment is:

[0044] Compressed air is generated by controlling the air compressor body 11, and is respectively sent to the first slurry tank 21 and the second slurry tank 22 through the first air supply pipe 12 and the second air supply pipe 13. Different types of slurries are injected into the first slurry tank 21 and the second slurry tank 22 in advance for comparison. At this time, the slurry in the first slurry tank 21 and the second slurry tank 22 is injected into the model box 3 through the first slurry supply pipe 23 and the second slurry supply pipe 24 through the grouting part 25. After passing through the center of the grouting pipe cover 251, the slurry is blocked by the grouting rotating baffle 252 and input into the guide pipe of the grouting diverter 253 along the fan-shaped gap of the grouting rotating baffle 252. At this time, controlling the position of the grouting rotating baffle 25 relative to the grouting pipe cover 251 can control the blades to be input into different areas separated in the grouting pipe shell 24 through guide pipes of different lengths, thereby realizing the segmented grouting simulation of similar material strata, and then realizing the simulation of grouting reinforcement and then excavation of the tunnel stratum.

[0045] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0046] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A test device for simulating segmented grouting of a tunnel, comprising a driving member (1), a grouting device (2), and a model box (3) including a loading device, characterized in that: The driving member (1) and the grouting device (2) are connected via a first air supply pipe (12) and a second air supply pipe (13); The grouting device (2) comprises a first slurry storage tank (21), a second slurry storage tank (22), a first slurry delivery pipe (23) and a second slurry delivery pipe (24) connected to the model box (3), and a grouting member (25); The grouting member (25) comprises a grouting pipe upper cover (251), a grouting rotating baffle (252), a grouting diverter (253) and a grouting pipe shell (254) which are movably connected as one body. The grouting pipe upper cover (251) is provided with an arc-shaped track and an input port. The grouting rotating baffle (252) is in a symmetrical fan-blade structure and is provided with a screw hole at the center. The center screw hole of the grouting rotating baffle (252) corresponds to the grouting pipe upper cover (251). A disc handle is also provided on the fan-shaped surface of the grouting rotating baffle (252). The disc handle corresponds to the arc-shaped track provided on the grouting pipe upper cover (251). The grouting diverter (253) consists of an upper disc and a lower guide tube. The surface of the grouting pipe shell (254) is provided with evenly distributed holes, and a partition plate is provided inside to divide the internal space of the grouting pipe shell (254) into three parts.

2. A test device for simulating segmented tunnel grouting according to claim 1, characterized in that: The first paddle conveying pipe (23) and the second paddle conveying pipe (24) connected to the model box (3) are both provided with valves and pressure gauges on their exteriors.

3. The test device for simulating segmented tunnel grouting according to claim 1, characterized in that: The driving member (1) includes an air compressor body (11), a compressed air outlet end of the air compressor body (11), the first air delivery pipe (12), and the second air delivery pipe (13) are in communication with each other, and valves are provided on the outside of the first air delivery pipe (12) and the second air delivery pipe (13).

4. The test device for simulating segmented tunnel grouting according to claim 1, characterized in that: The grouting diverter (253) has a plurality of guide tubes, and the lengths of the guide tubes are different. A screw hole is provided at the center of the disc for corresponding connection with the grouting rotating baffle (252). The disc of the grouting diverter (253) has an external thread. The upper part of the grouting pipe shell (254) is provided with an internal thread corresponding to the disc of the grouting diverter (253), and is connected to the grouting pipe shell (254) through the thread.

5. The test device for simulating segmented tunnel grouting according to claim 1, characterized in that: The model box (3) comprises a model box front baffle (31), a model box rear baffle (32), a first side panel (33), and a second side panel (34), forming a rectangular box body with an upper opening, wherein the surfaces of the first side panel (33) and the second side panel (34) are provided with multiple rows of exhaust holes.

6. The test device for simulating segmented tunnel grouting according to claim 1, characterized in that: The loading device comprises a loading frame (35) and a first jack (37) and a second jack (38) located on the loading frame (35).

7. A test device for simulating segmented tunnel grouting according to claim 6, characterized in that: The loading frame (35) is welded to the outside of the model box (3), and a movable loading beam (36) is slidably mounted on the loading frame (35), and the first jack (37) and the second jack (38) are both fixedly mounted on the loading beam (36).

8. The test device for simulating segmented tunnel grouting according to claim 7, characterized in that: A locking structure should also be installed between the loading beam (36) and the loading frame (35) to limit the position of the loading beam (36) after sliding.

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