A telescopic support device for underground cavern excavation

Abstract

This utility model provides a telescopic support device for underground cavern excavation, comprising at least two support component units and telescopic connecting rods connecting adjacent support component units. Each end of the telescopic connecting rod is fixedly connected to one of the support component units. The extension and retraction of the telescopic connecting rods drives the adjacent support component units to move closer or further apart. This support device provides timely support for underground caverns. During support, the device is installed inside the cavern, and the telescopic supports of the support component units extend to tighten the arch support beam and sidewall support beams respectively. Using multiple support component units provides support force to the surrounding rock, increasing the excavation advance per cycle, improving excavation efficiency, and shortening the construction period. The combined use of the telescopic connecting rods and telescopic supports allows for movement within the underground cavern, and the support device is reusable, saving costs.

Description

Technical Field

[0001] This utility model relates to the field of underground cavern construction technology, and in particular to a telescopic support device for underground cavern excavation. Background Technology

[0002] In the field of underground engineering construction, reinforced concrete structures are typically used as secondary lining support structures for underground caverns. However, in the early stages after the lining structure is poured, the low early stiffness of the concrete can easily lead to excessive settlement of the cavern roof, excessive convergence deformation of the sidewalls, and even encroachment on the clearance limits of the underground space project. Furthermore, a long waiting period is required until the stiffness of the concrete lining structure reaches the appropriate allowable value before subsequent excavation can proceed, affecting the construction schedule. To solve these problems, it is necessary to develop a support device that can reduce cavern deformation and increase the single excavation advance, thereby improving the construction efficiency of underground tunnel caverns. Utility Model Content

[0003] This utility model provides a telescopic support device for underground cavern excavation, which solves the problem of extended construction period in the prior art.

[0004] This utility model provides a telescopic support device for underground cavern excavation, including at least two support component units and a telescopic connecting rod connected between two adjacent support component units. Each end of the telescopic connecting rod is fixedly connected to one of the support component units. The telescopic movement of the telescopic connecting rod drives the two adjacent support component units to move closer or further apart.

[0005] The support assembly includes an arch support beam, two side wall support beams, two inclined inward support columns, and a telescopic strut. Each end of the arch support beam is hinged to one of the side wall support beams, and the ends of the two side wall support beams away from the arch support beam are each hinged to one of the inclined inward support columns. The two inclined inward support columns are arranged facing each other, and the ends of the two inclined inward support columns away from the side wall support beams are hinged to the ends of the telescopic struts. The ends of the telescopic struts away from the inclined inward support columns are connected to the bottom of the arch support beam. The extension and retraction of the telescopic struts drive the two side wall support beams to retract or expand.

[0006] Furthermore, both the telescopic connecting rod and the telescopic support rod are configured as hydraulic cylinders.

[0007] Furthermore, it also includes a support base, wherein the end of the side wall support beam away from the arch support beam is connected to the support base via a ball joint.

[0008] Furthermore, it also includes a connecting rod connecting the side wall support beam and the support base. One end of the connecting rod is fixedly connected to a universal ball, and the other end of the connecting rod is threaded to the side wall support beam. The support base is provided with a spherical groove for the universal ball to be embedded in.

[0009] Furthermore, at least two locking nuts are threaded onto the connecting rod, and the locking nuts are located between the universal ball and the side wall support beam.

[0010] Furthermore, the support assembly unit also includes a plug-in rod, the arch support beam includes an arch body and first connecting sleeves respectively fixedly connected to both ends of the arch body, the side wall support beam is provided with a second connecting sleeve at its end, the first connecting sleeve is provided with a connecting groove in the middle for the second connecting sleeve to be inserted, the plug-in rod passes through the first connecting sleeve and the second connecting sleeve, so that the first connecting sleeve and the second connecting sleeve maintain coaxial rotation, the plug-in rod is fixedly connected to the second connecting sleeve, and the plug-in rod is clearance-fitted with the first connecting sleeve.

[0011] Furthermore, the plug rod is interference-fitted with the second connecting sleeve.

[0012] Furthermore, a set screw is threaded onto the side wall of the second connecting sleeve, and the end of the set screw passes through the second connecting sleeve and contacts the outer wall of the plug rod.

[0013] Furthermore, multiple telescopic linkages are provided.

[0014] The beneficial effects of this utility model are as follows:

[0015] The support device described in this application provides timely support for underground caverns. During support, the device is installed inside the cavern, and the telescopic struts extend to tighten the arch support beam and sidewall support beams respectively. Multiple support component units provide support force to the surrounding rock, increasing the excavation advance per cycle, improving excavation efficiency, and shortening the construction period. The combined use of telescopic connecting rods and telescopic struts allows for movement within the underground cavern. The support device is reusable, saving costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 yes Figure 1 Enlarged diagram of point A in the middle.

[0018] Figure 3 This is a schematic diagram of the connection relationship of the set screw of this utility model.

[0019] Figure 4 This is a schematic diagram of the connection relationship of the support base.

[0020] Figure 5 This is a schematic diagram of the structure of the hydraulic cylinder of this utility model.

[0021] Figure label:

[0022] 1. Support assembly unit; 11. Arch support beam; 111. Arch body; 112. First connecting sleeve; 12. Side wall support beam; 121. Second connecting sleeve; 13. Inclined inward support column; 14. Telescopic support rod; 2. Telescopic connecting rod; 21. Cylinder body; 22. Mounting rod; 23. Piston rod; 24. Hydraulic piston; 3. Extension rod; 4. Support seat; 41. Spherical groove; 5. Connecting rod; 51. Universal ball; 52. Locking nut; 6. Insertion rod; 7. Set screw. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] The terms "first" and "second" in the specification and claims of this utility model may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise stated, "multiple" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] The following is combined Figures 1-4This invention describes a telescopic support device for underground cavern excavation, comprising at least two support component units 1 and a telescopic link 2 connecting two adjacent support component units 1. Each end of the telescopic link 2 is fixedly connected to a support component unit 1, and the telescopic movement of the telescopic link 2 drives the two adjacent support component units 1 to move closer or further apart.

[0027] The support assembly unit 1 includes an arch support beam 11, two side wall support beams 12, two inclined inward support columns 13, and a telescopic strut 14. Both ends of the arch support beam 11 are hinged to one side wall support beam 12, and the ends of the two side wall support beams 12 away from the arch support beam 11 are each hinged to an inclined inward support column 13. The two inclined inward support columns 13 are arranged facing each other, and the ends of both inclined inward support columns 13 away from the side wall support beams 12 are hinged to the ends of the telescopic strut 14. The end of the telescopic strut 14 away from the inclined inward support columns 13 is connected to the bottom of the arch support beam 11. When the telescopic strut 14 extends, it pushes the two side wall support beams 12 outward and presses them against the surrounding rock; when it retracts, it pulls the two side wall support beams 12 inward.

[0028] Specifically, such as Figure 1 As shown, the top of the telescopic strut 14 is fixedly connected to or hinged to the bottom of the arch support beam 11. The bottom of the telescopic strut 14 is simultaneously hinged to two inclined inward support columns 13. The ends of the two inclined inward support columns 13 furthest from the telescopic strut 14 are hinged to the bottom of the side wall support beam 12, and the tops of the side wall support beam 12 are hinged to the ends of the arch support beam 11. When the telescopic strut 14 retracts, it pulls the two side wall support beams 12 inward through the inclined inward support columns 13. When the telescopic strut 14 extends, it pushes the two side wall support beams 12 outward through the inclined inward support columns 13.

[0029] When using the support device of this application, the support device is installed in the tunnel. The telescopic support rod 14 extends and respectively supports the arch support beam 11 and the side wall support beam 12. Multiple support component units 1 can be set to provide support force to the surrounding rock, increase the single excavation advance, improve excavation efficiency, and shorten the construction period.

[0030] The specific workflow of the support device moving within the tunnel is as follows: When excavating the next cycle, the telescopic strut 14 of the rear support component unit 1 is retracted to unload the support force of the rear support component unit 1 on the surrounding rock. Then, the telescopic connecting rod 2 between the two support component units 1 is retracted, thereby pulling the rear support component unit 1 forward. Then, the telescopic strut 14 of the rear support component unit 1 is extended to apply the support force of the rear support component unit 1 on the surrounding rock. The telescopic strut 14 of the front support component unit 1 is retracted to unload the support force of the front support component unit 1 on the surrounding rock. Then, the telescopic connecting rod 2 between the support component units 1 is extended to push the front support component unit 1 forward. Then, the telescopic strut 14 of the front support component unit 1 is extended to apply the support force of the front support component unit 1 on the surrounding rock. This completes one forward movement process and support action.

[0031] Furthermore, both the telescopic link 2 and the telescopic support rod 14 are configured as hydraulic cylinders.

[0032] Furthermore, multiple telescopic linkages 2 are provided.

[0033] Specifically, both the telescopic connecting rod 2 and the telescopic support rod 14 are configured as hydraulic cylinders. The hydraulic cylinders drive the two sides of the support assembly unit 1 to retract or expand, and drive adjacent support assembly units 1 to move closer or further apart. The two ends of the telescopic connecting rod 2 can be fixedly connected to the side wall support beam 12 and the arch support beam 11 of the adjacent support assembly units 1, respectively. The synchronous movement of multiple telescopic connecting rods 2 drives the adjacent support assembly units 1 to move closer or further apart.

[0034] Specifically, such as Figure 5 As shown, the hydraulic cylinder includes a cylinder body 21 and a piston rod 23. A hydraulic piston 24 is fixedly connected to one end of the piston rod 23 that extends into the cylinder body, and the other end of the piston rod 23 that extends away from the hydraulic piston 24 extends out of the cylinder body 21. A mounting rod 22 is fixedly connected to the outer wall of the cylinder body 21. The mounting rod 22 is located at the end of the cylinder body 21 away from the piston rod 23, and the mounting rod 22 is integrally formed with the cylinder body 21.

[0035] Specifically, the telescopic support rod 14 is configured as a hydraulic cylinder. When connecting the telescopic support rod 14, within the same bracket assembly unit 1, the top of the piston rod 23 is fixedly connected to or hinged to the bottom of the arch support beam 11. The bottom of the mounting rod 22 is simultaneously hinged to the two inclined inward support columns 13.

[0036] Specifically, two telescopic connecting rods 2 are fixedly connected to the side wall support beams 12 opposite to each of the two support component units 1, and a telescopic connecting rod 2 located in the middle of the arch support beam 11 is fixedly connected between two adjacent arch support beams 11. In an optional embodiment, the two ends of the telescopic connecting rod 2 can be directly connected to the side wall support beam 12 or the arch support beam 11 by welding. When the telescopic connecting rod 2 is directly connected to the side wall support beam 12, the piston rod 23 is welded to the side wall support beam 12 on one support component unit 1, and the mounting rod 22 is welded to the side wall support beam 12 on the other support component unit 1. When the telescopic connecting rod 2 is directly connected to the arch support beam 11, the piston rod 23 is welded to the arch support beam 11 on one support component unit 1, and the mounting rod 22 is welded to the arch support beam 11 on the other support component unit 1.

[0037] In another alternative embodiment, such as Figure 1 As shown, extension rods 3 are welded onto the side wall support beam 12 and the arch support beam 11, with the extension rods 3 located on opposite sides of the two support assembly units 1. One end of the telescopic connecting rod 2 is fixedly connected to the extension rod 3 on one support assembly unit 1, and the other end of the telescopic connecting rod 2 is fixedly connected to the extension rod 3 on the other support assembly unit 1. The telescopic connecting rod 2 and the extension rod 3 can be fixed by welding.

[0038] Furthermore, it also includes a support base 4, with one end of the side wall support beam 12 away from the arch support beam 11 connected to the support base 4 via a ball joint.

[0039] Furthermore, it also includes a connecting rod 5 connecting the side wall support beam 12 and the support base 4. One end of the connecting rod 5 is fixedly connected to a universal ball 51, and the other end of the connecting rod 5 is threaded to the side wall support beam 12. The support base 4 is provided with a spherical groove 41 for the universal ball 51 to be inserted.

[0040] Furthermore, at least two locking nuts 52 are threaded onto the connecting rod 5, and the locking nuts 52 are located between the universal ball 51 and the side wall support beam 12.

[0041] Specifically, such as Figure 1 , Figure 4 As shown, the universal ball joint 51 and the connecting rod 5 are integrally formed. When connecting the support base 4 and the side wall support beam 12, one end of the universal ball joint 51 is embedded in the spherical groove 41, and one end of the connecting rod 5 is threaded to the bottom of the side wall support beam 12. The connecting rod 5 and the side wall support beam 12 are locked by tightening the locking nut 52. The side wall support beam 12 contacts the cavern floor through the support base 4. The support base 4 disperses the pressure of the side wall support beam 12 on the ground, improving the stability of the support assembly unit 1. The ball joint connection between the support base 4 and the end of the side wall support beam 12 ensures stable contact between the side wall support beam 12 and the ground when it is opened and closed.

[0042] Furthermore, the support assembly unit 1 also includes a plug-in rod 6. The arch support beam 11 includes an arch body 111 and first connecting sleeves 112 fixedly connected to both ends of the arch body 111. The side wall support beam 12 is provided with a second connecting sleeve 121 at its end. The first connecting sleeve 112 is provided with a connecting groove in the middle for the second connecting sleeve 121 to be inserted. The plug-in rod 6 passes through the first connecting sleeve 112 and the second connecting sleeve 121, so that the first connecting sleeve 112 and the second connecting sleeve 121 keep coaxial rotation. The plug-in rod 6 is fixedly connected to the second connecting sleeve 121. The plug-in rod 6 and the first connecting sleeve 112 are clearance-fitted, so that the side wall support beam 12 can rotate relative to the arch support beam 11.

[0043] Specifically, the second connecting sleeve 121 is welded to the top of the side wall support beam 12. When connecting the side wall support beam 12 to the arch support beam 11, the second connecting sleeve 121 is inserted into the connecting groove, and the plug rod 6 is passed through the first connecting sleeve 112 and the second connecting sleeve 121, so that the first connecting sleeve 112 and the second connecting sleeve 121 rotate coaxially. The plug rod 6 is fixedly connected to the second connecting sleeve 121, and the plug rod 6 is clearance-fitted to the first connecting sleeve 112, so that the plug rod 6 can rotate relative to the first connecting sleeve 112, thereby enabling the side wall support beam 12 to rotate relative to the arch support beam 11. Furthermore, a telescopic connecting rod 2 can be fixedly connected between the plug rods 6 of two adjacent support component units 1.

[0044] Furthermore, in another alternative embodiment, such as Figure 2 As shown, the plug rod 6 and the second connecting sleeve 121 are interference-fitted. In an optional embodiment, the plug rod 6 and the first connecting sleeve 112 are fixed together by the interference fit between the plug rod 6 and the second connecting sleeve 121.

[0045] Furthermore, in another alternative embodiment, such as Figure 3 As shown, a set screw 7 is threaded onto the side wall of the second connecting sleeve 121. The end of the set screw 7 passes through the second connecting sleeve 121 and contacts the outer wall of the insertion rod 6. The side wall of the insertion rod 6 has a flat surface or recess that mates with the set screw 7. The insertion rod 6 is inserted into the second connecting sleeve 121. By tightening the set screw 7, the set screw 7 is pressed against the outer wall of the insertion rod 6, thereby achieving mutual fixation between the insertion rod 6 and the second connecting sleeve 121. Furthermore, a recess can be provided on the side wall of the insertion rod 6 for the end of the set screw 7 to be inserted into, thereby improving the fixing effect between the insertion rod 6 and the second connecting sleeve 121.

[0046] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A telescopic support device for underground cavern excavation, characterized in that: It includes at least two support assembly units and a telescopic link connecting two adjacent support assembly units. Each end of the telescopic link is fixedly connected to one of the support assembly units. The extension and retraction of the telescopic link drives the two adjacent support assembly units to move closer or further apart. The support assembly unit includes an arch support beam, two side wall support beams, two inclined inward support columns, and a telescopic strut. Each end of the arch support beam is hinged to one of the side wall support beams, and the ends of the two side wall support beams away from the arch support beam are each hinged to one of the inclined inward support columns. The two inclined inward support columns are arranged facing each other, and the ends of the two inclined inward support columns away from the side wall support beams are hinged to the ends of the telescopic struts. The ends of the telescopic struts away from the inclined inward support columns are connected to the bottom of the arch support beam. The extension and retraction of the telescopic struts drive the two side wall support beams to retract or expand.

2. The telescopic support device for underground cavern excavation according to claim 1, characterized in that: Both the telescopic connecting rod and the telescopic support rod are configured as hydraulic cylinders.

3. The telescopic support device for underground cavern excavation according to claim 1, characterized in that: It also includes a support base, and the end of the side wall support beam away from the arch support beam is connected to the support base by a ball joint.

4. The telescopic support device for underground cavern excavation according to claim 3, characterized in that: It also includes a connecting rod connecting the side wall support beam and the support base. One end of the connecting rod is fixedly connected to a universal ball, and the other end of the connecting rod is threaded to the side wall support beam. The support base is provided with a spherical groove for the universal ball to be embedded in.

5. The telescopic support device for underground cavern excavation according to claim 4, characterized in that: At least two locking nuts are threaded onto the connecting rod, and the locking nuts are located between the universal ball and the side wall support beam.

6. The telescopic support device for underground cavern excavation according to any one of claims 1-5, characterized in that: The support assembly unit further includes a plug-in rod. The arch support beam includes an arch body and first connecting sleeves fixedly connected to both ends of the arch body. The side wall support beam is provided with a second connecting sleeve at its end. The first connecting sleeve has a connecting groove in the middle for the second connecting sleeve to be inserted. The plug-in rod passes through the first connecting sleeve and the second connecting sleeve, so that the first connecting sleeve and the second connecting sleeve rotate coaxially. The plug-in rod is fixedly connected to the second connecting sleeve, and the plug-in rod is clearance-fitted with the first connecting sleeve.

7. The telescopic support device for underground cavern excavation according to claim 6, characterized in that: The plug rod is interference-fitted with the second connecting sleeve.

8. The telescopic support device for underground cavern excavation according to claim 6, characterized in that: A set screw is threaded onto the side wall of the second connecting sleeve, and the end of the set screw passes through the second connecting sleeve and contacts the outer wall of the plug rod.

9. The telescopic support device for underground cavern excavation according to claim 1, characterized in that: Multiple telescopic connecting rods are provided between two adjacent support component units.

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