Large-span variable cross-section tunnel support pouring test device and construction method

Abstract

The invention relates to the technical field of tunnel engineering, in particular to a large-span variable-cross-section tunnel support pouring test device and a construction method.The device comprises a base, a mechanical arm propelling system, a sealing system and a pumping system.The mechanical arm propelling system comprises a telescopic mechanical arm assembly and a rotating mechanical arm assembly connected with the telescopic mechanical arm assembly and the base; the mechanical arm assembly is rotated to advance or retreat relative to the base, the sealing system makes contact with the preorder supporting structure and comprises a storage bin, a bonding bin and a sealing piece connected with the storage bin and the bonding bin and rolled in the storage bin, the telescopic mechanical arm assembly is driven to drive the storage bin and the bonding bin to move in the opposite direction or away from each other, and the sealing piece is rolled or unfolded. The pumping system comprises a material pump arranged on the base, a plugging end connected with the storage bin and a pipeline connected with the plugging end, the plugging end and the bonding bin are attached to the upper edge and the lower edge of a to-be-supported area respectively, and the device is simple in structure, suitable for a narrow operation space, capable of guaranteeing the simulation precision and the forming quality of supporting and high in applicability.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel engineering, and in particular to a large-span variable-section tunnel support casting test device and a construction method. Background Art

[0002] Tunnel similarity simulation tests simulate the structure, mechanics and service characteristics of actual tunnels by reducing the scale (usually using a test size of 1:100 of the actual size). This research method can help researchers understand potential problems in tunnel construction and operation under laboratory conditions, thereby optimizing design solutions and predicting the safety and durability of tunnels.

[0003] Similar simulation tests of large-span variable-section tunnels usually require simulation of section excavation methods such as the CRD method and the CD method. Such excavation methods require the tunnel section to be divided into multiple small sections for separate excavation, and then support is applied after the cavern is excavated. At present, when the support and pouring of the middle partition wall is carried out in similar simulation tests of large-span variable-section tunnels, two methods are often used: artificially applying support similar materials on the inner wall of the tunnel, and prefabricating the lining and then installing it to the support position. However, in similar simulation tests, when the section excavation method is used for tunnels that have been reduced in scale, the space of each small section is small, and the method of artificially applying to form support is difficult to implement. Especially when the support similar materials are not well bonded to the inner wall of the cavern, it is easy to cause the support to fall off, and the quality of the support construction is difficult to ensure. The method of prefabricating the lining and then installing it to the support position does not conform to the actual tunnel support construction process. The surrounding rock deformation occurs after tunnel excavation, and the size of the prefabricated support materials is difficult to fully match the area to be supported. In addition, the tunnel cross-section is constantly changing. When transitioning from a small section to a large section, the size of the prefabricated large-section support material cannot pass through the small-section cavern in front. As the tunnel excavation depth increases, the method of manually applying support similar materials and prefabricating the lining and then installing it to the support position is difficult to achieve. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a large-span variable-section tunnel support casting test device and construction method that can realize the simulation of support casting and construction in similar simulation tests of large-span variable-section tunnels, and ensure the construction accuracy and molding quality of the support.

[0005] The first aspect of the present invention provides a large-span variable-section tunnel support casting test device, comprising:

[0006] Base;

[0007] A mechanical arm propulsion system, the mechanical arm propulsion system comprising a rotating mechanical arm assembly and a telescopic mechanical arm assembly, one end of the rotating mechanical arm assembly is connected to the base, and the other end is connected to the telescopic mechanical arm assembly, and the rotating mechanical arm assembly can move forward or backward relative to the base;

[0008] A sealing system, wherein the sealing system contacts the preceding support structure, and the sealing system comprises a sealing member, a storage bin and a bonding bin. One end of the sealing member is connected to the storage bin, and the other end is connected to the bonding bin. The sealing member is suitable for being rolled up in the storage bin, and the bonding bin is suitable for being attached to the lower edge of the area to be supported. The storage bin and the bonding bin are both connected to the telescopic mechanical arm assembly, and the telescopic mechanical arm assembly is driven to drive the storage bin and the bonding bin to move toward or away from each other, so that the sealing member is rolled up or unfolded;

[0009] A pumping system, the pumping system includes a material pump, a pipeline, and a plugging end. The material pump is arranged on the base, the material pump and the plugging end are connected through the pipeline, the plugging end is connected to the storage bin, and is attached to the upper edge of the area to be supported.

[0010] Optionally, the front ends of the storage bin and the bonding bin are both provided with spikes.

[0011] Optionally, an elastic member is provided in the storage bin, and one end of the sealing member is connected to the elastic member.

[0012] Optionally, the surface of the seal is coated with a nano-hydrophobic coating.

[0013] Optionally, a first magnetic component is provided on the preceding support structure, and a second magnetic component is provided on the side of the sealing component facing the robotic arm propulsion system, and the second magnetic component is suitable for being adsorbed with the first magnetic component to form a sealed space.

[0014] Optionally, a flexible member is provided on a side of the blocking end facing away from the storage bin, and the flexible member fits against an inner wall of the area to be supported.

[0015] Optionally, the blocking end is provided with a plurality of openings, and the plurality of openings are suitable for connecting with the pipeline;

[0016] A slurry stop valve is arranged on the pipeline.

[0017] Optionally, the rotating mechanical arm assembly includes a first mechanical arm and a second mechanical arm, one end of the first mechanical arm is connected to the base, and the other end is hingedly connected to the second mechanical arm, and the other end of the second mechanical arm is sleeved with a rotating sleeve;

[0018] The telescopic mechanical arm assembly includes a first telescopic mechanical arm and a second telescopic mechanical arm. One end of the first telescopic mechanical arm and the second telescopic mechanical arm are connected to the rotating sleeve, and the other end is respectively connected to the storage bin and the bonding bin.

[0019] A second aspect of the present invention provides a large-span variable-section tunnel support casting test construction method, which is based on any of the large-span variable-section tunnel support casting test devices described above and includes the following steps:

[0020] S1, driving the rotating mechanical arm assembly to make the storage bin and the bonding bin move toward each other, so that the sealing member is rolled up in the storage bin;

[0021] S2, driving the rotating mechanical arm assembly to move, and delivering the storage bin and the bonding bin to the area to be supported, so that the side of the sealing member facing the rotating mechanical arm assembly is flush with the side to be bonded to the previous support structure;

[0022] S3, driving the rotating mechanical arm assembly to move, so that the blocking end is closely attached to the upper edge of the area to be supported, the sealing member is unfolded, the bonding chamber is closely attached to the lower edge of the area to be supported, and the side of the sealing member facing the rotating mechanical arm assembly is closely attached to the side of the preceding support structure to be attached;

[0023] S4, according to the height of the area to be supported, the pipeline is connected to the plugging end at a suitable height, the material pump is started, and the support-similar material is pumped into the area to be supported, and the pumping is terminated by judging the pressure in the pipeline;

[0024] S5. After the supporting similar materials have formed strength, the rotating mechanical arm assembly is driven to move so that the sealing member is rolled up, and the supporting construction is completed;

[0025] S6. Repeat steps S1 to S5 to complete the support construction at other locations.

[0026] Compared with the prior art, the technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0027] The embodiment of the present invention provides a large-span variable-section tunnel support pouring test device and construction method. This device is connected to the base and the telescopic mechanical arm component by setting a rotating mechanical arm component. The other end of the telescopic mechanical arm component is connected to the sealing system, so that the sealing system can be driven into the area to be supported by driving the rotating mechanical arm component. The two ends of the seal are respectively connected to the storage bin and the bonding bin. The telescopic mechanical arm component is driven to drive the storage bin and the bonding bin to move towards each other, so that the seal can be rolled up in the storage bin, reducing the forward resistance of the sealing system and avoiding damage to the seal. When the storage bin and the bonding bin reach the position to be poured, the telescopic mechanical arm component is driven to drive the sealing end to fit the area to be supported. The upper edge drives the bonding chamber to fit the lower edge of the area to be supported, that is, the storage chamber and the bonding chamber move away from each other, so that the seal is expanded to form a sealed space with the casting space, and the pipeline is connected to the sealing end. The support similar material is pumped from the material pump to the area to be supported, and the support work is completed after the support similar material forms strength. This device has a simple structure and is suitable for narrow operating spaces. At the same time, it ensures the simulation accuracy and molding quality of the support, and can support according to the different surrounding rock shapes of the area to be supported. It has high applicability and can realize the simulation of support casting and construction in similar simulation tests of large-span variable-section tunnels, without the need to prefabricate support materials, thereby ensuring the smooth progress of similar simulation tests of tunnels. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0030] Figure 1 It is a structural schematic diagram of a large-span variable-section tunnel support casting test device according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the use of the large-span variable-section tunnel support casting test device according to an embodiment of the present invention;

[0032] Figure 3 It is a schematic structural diagram of the sealing system described in an embodiment of the present invention.

[0033] Among them, 1. base; 2. preceding support structure; 3. seal; 4. storage bin; 5. bonding bin; 6. area to be supported; 7. material pump; 8. pipeline; 9. plugging end; 10. spike; 11. elastic part; 12. first magnetic part; 13. second magnetic part; 14. flexible part; 15. opening; 16. slurry stop valve; 17. first mechanical arm; 18. second mechanical arm; 19. rotating sleeve; 20. first telescopic mechanical arm; 21. second telescopic mechanical arm; 22. rock and soil to be excavated. DETAILED DESCRIPTION

[0034] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0036] Reference Figures 1 to 3 As shown, the first aspect of this embodiment provides a large-span variable-section tunnel support casting test device, including a base 1, a mechanical arm propulsion system, a sealing system and a pumping system.

[0037] Among them, the robot arm propulsion system includes a rotating robot arm assembly and a telescopic robot arm assembly. One end of the rotating robot arm assembly is connected to the base 1, and the other end is connected to the telescopic robot arm assembly. The rotating robot arm assembly can move forward or backward relative to the base 1; the sealing system is in contact with the preceding support structure 2, and the sealing system includes a sealing member 3, a storage bin 4 and a bonding bin 5. One end of the sealing member 3 is connected to the storage bin 4, and the other end is connected to the bonding bin 5, and the sealing member 3 is suitable for being rolled up in the storage bin 4, and the bonding bin 5 is suitable for being rolled up in the storage bin 4. The connecting bin 5 is suitable for fitting with the lower edge of the area to be supported 6. The storage bin 4 and the bonding bin 5 are both connected to the telescopic mechanical arm assembly. The telescopic mechanical arm assembly is driven to drive the storage bin 4 and the bonding bin 5 to move toward or away from each other, so that the seal 3 is rolled up or unfolded; the pumping system includes a material pump 7, a pipeline 8, and a sealing end 9. The material pump 7 is arranged on the base 1. The material pump 7 and the sealing end 9 are connected by the pipeline 8. The sealing end 9 is connected to the storage bin 4 and fits with the upper edge of the area to be supported 6.

[0038] Specifically, the rotating mechanical arm assembly is connected to the base 1 and the telescopic mechanical arm assembly, and the other end of the telescopic mechanical arm assembly is connected to the sealing system, so that the sealing system can be driven into the area to be supported 6 by driving the rotating mechanical arm assembly. The storage bin 4 and the bonding bin 5 are relatively arranged, and the two ends of the sealing member 3 are respectively connected to the storage bin 4 and the bonding bin 5. Before the storage bin 4 and the bonding bin 5 are transported, the telescopic mechanical arm assembly is driven to drive the storage bin 4 and the bonding bin 5 to move toward each other, so that the sealing member 3 is rolled up in the storage bin 4, reducing the resistance of the sealing system to move forward and avoiding damage to the sealing member 3. The storage bin 4 is a cylindrical structure, which is convenient for the sealing member 3 to be rolled up. The bonding bin 5 is a Cinderella anti-kick structure. When the storage bin 4 and the bonding bin 5 reach the position to be poured, the telescopic mechanical arm assembly is driven to drive the sealing end 9 to fit thereon. The upper edge of the area to be supported 6 drives the bonding bin 5 to fit the lower edge of the area to be supported 6, that is, the storage bin 4 and the bonding bin 5 move away from each other, so that the seal 3 is unfolded, and one side of the seal 3 contacts the preceding support structure 2 to form a sealed space with the casting space, and the pipeline 8 is connected to the sealing end 9, and the support similar material is pumped from the material pump 7 into the area to be supported 6, and the support work is completed after the support similar material forms strength. This device has a simple structure and is suitable for narrow operating spaces. At the same time, it ensures the simulation accuracy and molding quality of the support, and can support according to the different surrounding rock shapes of the area to be supported. It has high applicability and can realize the simulation of support casting and construction in similar simulation tests of large-span variable-section tunnels, without the need to prefabricate support materials, thereby ensuring the smooth progress of similar simulation tests of tunnels.

[0039] Further, see Figure 1 and Figure 2 As shown, the front ends of the storage bin 4 and the bonding bin 5 are both provided with spikes 10. Specifically, when the storage bin 4 and the bonding bin 5 reach the position to be poured, the telescopic mechanical arm assembly is driven to drive the blocking end 9 to fit the upper edge of the area to be supported 6, and drive the bonding bin 5 to fit the lower edge of the area to be supported 6, that is, the storage bin 4 and the bonding bin 5 move away from each other, so that the seal 3 is unfolded, and the spikes 10 provided at the front ends of the storage bin 4 and the bonding bin 5 are inserted into the rock and soil body 22 to be excavated in front, thereby improving the stability of the storage bin 4 and the bonding bin 5 during the pouring support construction.

[0040] Reference Figure 3 As shown, an elastic member 11 is provided in the storage bin 4, and one end of the sealing member 3 is connected to the elastic member 11. Specifically, the elastic member 11 is a spring, and by providing the elastic member 11 in the storage bin 4, and connecting one end of the elastic member 11 to the sealing member 3, when the storage bin 4 and the bonding bin 5 move toward each other, the sealing member 3 is automatically rolled up in the storage bin 4 under the elastic action of the elastic member 11.

[0041] In order to prevent the sealing member 3 from being bonded to the supporting similar material during casting, the surface of the sealing member 3 is coated with a nano-hydrophobic coating.

[0042] Reference Figure 2 As shown, a first magnetic member 12 is provided on the preceding support structure 2, and a second magnetic member 13 is provided on the side of the sealing member 3 facing the robot arm propulsion system, and the second magnetic member 13 is suitable for adsorbing with the first magnetic member 12 to form a sealed space. Specifically, by providing the first magnetic member 12 and the second magnetic member 13 for adsorption, the sealing member 3 and the preceding support structure 2 are adsorbed, thereby improving the sealing of the casting space.

[0043] Continue to refer to Figure 2 As shown, a flexible member 14 is provided on the side of the plugging end 9 facing away from the storage bin 4, and the flexible member 14 is in contact with the inner wall of the area to be supported 6. Specifically, the flexible member 14 is a rubber strip, and by providing the flexible member 14 on the side of the plugging end 9 facing the area to be supported 6, when the plugging end 9 moves toward the area to be supported 6, the flexible member 14 is in contact with the inner wall of the area to be supported 6, thereby improving the sealing between the plugging end 9 and the casting space.

[0044] In some embodiments, a plurality of openings 15 are provided on the plugging end 9, and the plurality of openings 15 are suitable for being connected to the pipeline 8, and a slurry stop valve 16 is provided on the pipeline 8. Specifically, by providing a plurality of openings 15 on the plugging end 9, an opening 15 of a suitable height can be selected according to the height of the area to be supported 6, the pipeline 8 is connected to the opening 15 of a suitable height, the other openings are closed, the material pump 7 is started, and the support-like material is pumped into the cavity of the area to be supported 6, and the slurry stop valve 16 can judge the pumping end time of the support-like material by the pumping pressure.

[0045] Reference Figure 1As shown, the rotating robotic arm assembly includes a first robotic arm 17 and a second robotic arm 18, one end of the first robotic arm 17 is connected to the base 1, and the other end is hingedly connected to the second robotic arm 18, and the other end of the second robotic arm 18 is sleeved with a rotating sleeve 19, and the telescopic robotic arm assembly includes a first telescopic robotic arm 20 and a second telescopic robotic arm 21, one end of the first telescopic robotic arm 20 and the second telescopic robotic arm 21 are both connected to the rotating sleeve 19, and the other ends are respectively connected to the storage bin 4 and the bonding bin 5. Specifically, the first telescopic mechanical arm 20 and the second telescopic mechanical arm 21 are connected to the rotating sleeve 19 through a mechanical arm joint. Two opposite legs are provided at one end of the mechanical arm joint away from the rotating sleeve 19. The first telescopic mechanical arm 20 and the second telescopic mechanical arm 21 are respectively hingedly connected to the two legs, driving the first mechanical arm 17 to move, and driving the second mechanical arm 18 to move, thereby driving the mechanical arm joint, the first telescopic mechanical arm 20 and the second telescopic mechanical arm 21 to move synchronously, so that the sealing system reaches the position to be poured. By setting the rotating sleeve 19, the first telescopic mechanical arm 20 and the second telescopic mechanical arm 21 are driven to rotate according to the rock shape and height of the area to be supported 6, thereby changing the angle formed by the sealing member 3 and the ground, so that the second magnetic member 13 can be flush with the first magnetic member 12, thereby adsorbing to form a sealed space, thereby improving the support effect.

[0046] A second aspect of the present embodiment provides a large-span variable-section tunnel support pouring test construction method, which is based on the large-span variable-section tunnel support pouring test device described above and includes the following steps:

[0047] S1. Drive the rotating mechanical arm assembly to make the storage bin 4 and the bonding bin 5 move toward each other, so that the seal 3 is rolled up in the storage bin 4. Specifically, drive the first telescopic mechanical arm 20 and the second telescopic mechanical arm 21 to drive the storage bin 4 and the bonding bin 5 to move toward each other. The seal 3 is rolled up in the storage bin 4 under the elastic action of the elastic member 11, so as to enter the support area 6 with the mechanical arm propulsion system;

[0048] S2, drive the rotating mechanical arm assembly to move, and deliver the storage bin 4 and the bonding bin 5 to the area to be supported 6, so that the side of the seal 3 facing the rotating mechanical arm assembly is flush with the side to be attached to the previous support structure 2. Specifically, drive the first mechanical arm 17 and the second mechanical arm 18 to move toward the area to be supported 6, and drive the first telescopic mechanical arm 20 and the second telescopic mechanical arm 21 to move toward the area to be supported 6, so as to realize the delivery of the storage bin 4 and the bonding bin 5 to the area to be supported 6, and drive the rotating sleeve 19 to drive the first telescopic mechanical arm 20 and the second telescopic mechanical arm 21 to rotate, so as to change the angle formed by the seal 3 and the ground, so that the second magnetic part 13 can be flush with the first magnetic part 12;

[0049] S3, drive the rotating mechanical arm assembly to move, so that the blocking end 9 is tightly fitted with the upper edge of the area to be supported 6, the seal 3 is unfolded, the bonding chamber 5 is tightly fitted with the lower edge of the area to be supported 6, and the side of the seal 3 facing the rotating mechanical arm assembly is tightly fitted with the side to be fitted with the previous support structure 2. Specifically, drive the first telescopic mechanical arm 20 to move, so that the flexible member 14 is tightly attached to the inner wall of the area to be supported 6, and drive the second telescopic mechanical arm 21 to move, so that the bonding chamber 5 is tightly fitted with the lower edge of the area to be supported 6. At this time, the seal 3 is unfolded, and the second magnetic member 13 can be adsorbed with the first magnetic member 12 to form a sealed space;

[0050] S4. According to the height of the area to be supported 6, the pipeline 8 is connected to the plugging end 9 at a suitable height, the material pump 7 is started, and the support similar material is pumped into the area to be supported 6. The pumping is terminated by judging the pressure in the pipeline 8. Specifically, according to the height of the area to be supported 6, the pipeline 8 is connected to the opening 15 at a suitable height, and other openings 15 are closed. The support similar material is pumped into the area to be supported 6. The slurry stop valve 16 judges the end time of the pumping of the support similar material by the pumping pressure.

[0051] S5. After the support similar materials form strength, drive the rotating mechanical arm assembly to move, so that the seal 3 is rolled up, and the support construction is completed. Specifically, after the support similar materials form strength, drive the first telescopic mechanical arm 20 and the second telescopic mechanical arm 21 to move toward each other, so that the seal 3 is rolled up into the storage bin 4 under the elastic action of the elastic member 11, thereby completing the support work at this position;

[0052] S6. Repeat steps S1 to S5 to complete the support construction at other locations.

[0053] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0054] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments described herein, but should conform to the widest scope consistent with the principles and novel features invented herein.

Claims

1. A large-span variable-section tunnel support casting test device, characterized in that: include: Base (1); A robotic arm propulsion system, the robotic arm propulsion system comprising a rotating robotic arm assembly and a telescopic robotic arm assembly, one end of the rotating robotic arm assembly being connected to the base (1), and the other end being connected to the telescopic robotic arm assembly, the rotating robotic arm assembly being capable of moving forward or backward relative to the base (1); A sealing system, wherein the sealing system is in contact with the preceding support structure (2), and the sealing system comprises a sealing member (3), a storage bin (4) and a bonding bin (5); one end of the sealing member (3) is connected to the storage bin (4), and the other end is connected to the bonding bin (5); the sealing member (3) is suitable for being rolled up in the storage bin (4); the bonding bin (5) is suitable for being attached to the lower edge of the area to be supported (6); the storage bin (4) and the bonding bin (5) are both connected to the telescopic mechanical arm assembly; the telescopic mechanical arm assembly is driven to drive the storage bin (4) and the bonding bin (5) to move toward or away from each other, so that the sealing member (3) is rolled up or unfolded; A pumping system, the pumping system comprising a material pump (7), a pipeline (8), and a plugging end head (9); the material pump (7) is arranged on the base (1); the material pump (7) and the plugging end head (9) are connected via the pipeline (8); the plugging end head (9) is connected to the storage bin (4) and is attached to the upper edge of the area to be supported (6).

2. The large-span variable-section tunnel support casting test device according to claim 1 is characterized in that: The front ends of the storage bin (4) and the bonding bin (5) are both provided with spikes (10).

3. The large-span variable-section tunnel support casting test device according to claim 1 is characterized in that: An elastic member (11) is provided in the storage bin (4), and one end of the sealing member (3) is connected to the elastic member (11).

4. The large-span variable-section tunnel support casting test device according to claim 1 is characterized in that: The surface of the sealing element (3) is coated with a nano-hydrophobic coating.

5. The large-span variable-section tunnel support casting test device according to claim 1 is characterized in that: A first magnetic component (12) is arranged on the preceding support structure (2), and a second magnetic component (13) is arranged on the side of the sealing component (3) facing the robotic arm propulsion system, wherein the second magnetic component (13) is suitable for being adsorbed with the first magnetic component (12) to form a sealed space.

6. The large-span variable-section tunnel support casting test device according to claim 1 is characterized in that: A flexible member (14) is provided on the side of the blocking end (9) facing away from the storage bin (4), and the flexible member (14) is in contact with the inner wall of the area to be supported (6).

7. The large-span variable-section tunnel support casting test device according to claim 1 is characterized in that: The plugging end (9) is provided with a plurality of openings (15), and the plurality of openings (15) are suitable for being connected to the pipeline (8); The pipeline (8) is provided with a slurry stop valve (16).

8. The large-span variable-section tunnel support casting test device according to claim 1 is characterized in that: The rotating mechanical arm assembly comprises a first mechanical arm (17) and a second mechanical arm (18); one end of the first mechanical arm (17) is connected to the base (1), and the other end is hingedly connected to the second mechanical arm (18); the other end of the second mechanical arm (18) is sleeved with a rotating sleeve (19); The telescopic mechanical arm assembly comprises a first telescopic mechanical arm (20) and a second telescopic mechanical arm (21); one end of the first telescopic mechanical arm (20) and the second telescopic mechanical arm (21) are both connected to the rotating sleeve (19), and the other ends are respectively connected to the storage bin (4) and the bonding bin (5).

9. A large-span variable-section tunnel support pouring test construction method, based on the large-span variable-section tunnel support pouring test device described in any one of claims 1 to 8, characterized in that: The following steps are involved: S1, driving the rotating mechanical arm assembly to make the storage bin (4) and the bonding bin (5) move toward each other, so that the sealing element (3) is rolled up in the storage bin (4); S2, driving the rotating mechanical arm assembly to move, and delivering the storage bin (4) and the bonding bin (5) to the area to be supported (6), so that the side of the sealing member (3) facing the rotating mechanical arm assembly is flush with the side of the preceding supporting structure (2) to be bonded; S3, driving the rotating mechanical arm assembly to move, so that the blocking end (9) is tightly fitted with the upper edge of the area to be supported (6), the sealing member (3) is unfolded, the bonding chamber (5) is tightly fitted with the lower edge of the area to be supported (6), and the side of the sealing member (3) facing the rotating mechanical arm assembly is tightly fitted with the side of the preceding supporting structure (2) to be fitted; S4, according to the height of the area to be supported (6), the pipeline (8) is connected to the plugging end (9) at a suitable height, the material pump (7) is started, and the support-similar material is pumped into the area to be supported (6), and the pumping is terminated by judging the pressure in the pipeline (8); S5, after the supporting similar materials have formed strength, the rotating mechanical arm assembly is driven to move so that the sealing member (3) is rolled up, and the supporting construction is completed; S6. Repeat steps S1 to S5 to complete the support construction at other locations.

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