Temporary inner support for reverse tunneling

Abstract

The utility model relates to the field of tunnel supports, in particular to a reverse tunnel temporary inner support which comprises a supporting arch plate, a bottom plate and an inclined supporting rod, a first mounting groove and a second mounting groove are formed in the bottom of the inner side wall of the supporting arch plate, the first mounting groove is a blind groove, the second mounting groove is a through groove, one end of the bottom plate is inserted into the first mounting groove, and the other end of the bottom plate is inserted into the inclined supporting rod. The other end of the bottom plate is inserted into the second mounting groove, the two ends of the bottom plate are fixed into the first mounting groove and the second mounting groove through bolts correspondingly, and the bottom plate is further fixed into the ground of the tunnel through pins. The inclined supporting rods are symmetrically arranged on the two sides of the central axis of the bottom plate, the highest ends of the inclined supporting rods are far away from the center of the bottom plate compared with the lowest ends of the inclined supporting rods, the highest ends of the inclined supporting rods are fixedly connected with the inner walls of the supporting arch plates through connecting pieces, and the lowest ends of the inclined supporting rods are fixedly connected to the center of the bottom plate. The device has the effect that the soil layer is not prone to loosening and falling down when the tunnel is reversely drilled.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tunnel support, in particular to a temporary inner support for counter-boring tunnel. BACKGROUND

[0002] During the process of tunneling, if large rocks are encountered, it is inconvenient to continue to excavate in the positive direction and tunnel collapse may occur. Therefore, at this time, the tunnel needs to be excavated by counter-boring from the other side until the rock is removed to connect the positive and counter-boring tunnels. Since the surrounding of the counter-boring tunnel is usually narrow and steep, the excavation and earth removal equipment cannot easily enter, so the counter-boring of the tunnel is usually done manually. However, during counter-boring, the soil layer may become loose and fall down. Therefore, there is a need to provide a temporary inner support for counter-boring tunnel. CONTENT OF THE UTILITY MODEL

[0003] In order to prevent the soil layer from becoming loose and falling down during counter-boring, the present application provides a temporary inner support for counter-boring tunnel.

[0004] The temporary inner support for counter-boring tunnel provided by the present application adopts the following technical solution:

[0005] A temporary inner support for counter-boring tunnel, comprising a support arch plate, a bottom plate and an inclined strut, a first installation slot and a second installation slot are formed in the bottom of the inner side wall of the support arch plate, the first installation slot is a blind slot, the second installation slot is a through slot, one end of the bottom plate is inserted into the first installation slot, the other end of the bottom plate is inserted into the second installation slot, and the two ends of the bottom plate are fixed in the first installation slot and the second installation slot by bolts, respectively, and the bottom plate is also fixed to the ground in the tunnel by a pin.

[0006] The inclined struts are symmetrically arranged on both sides of the central axis of the bottom plate, the highest end of the inclined strut is farther away from the center of the bottom plate than the lowest end, the highest end of the inclined strut is fixedly connected to the inner wall of the support arch plate by a connecting piece, and the lowest end of the inclined strut is fixedly connected to the center of the bottom plate.

[0007] By adopting the above technical solution, when counter-boring the tunnel, the temporary inner support of the present application is placed in the tunnel, multiple supports can be placed equidistantly according to the actual situation, and the bottom plate is fixed to the ground in the tunnel by a pin. The outer wall of the support arch plate supports the inner wall of the tunnel, so that the soil layer does not easily become loose and fall down. At the same time, the arrangement of the inclined struts makes the inner wall of the temporary support of the present application have multiple triangular structures, improving the stability of the temporary support of the present application.

[0008] Optionally, the connecting piece is a connecting plate, both ends of the connecting plate are fixedly connected to the inner wall of the support arch plate, and the highest end of the inclined strut is fixedly connected to the bottom surface of the connecting plate.

[0009] By adopting the technical scheme, the connection plate is arranged, and the structural stability of the temporary support is further improved.

[0010] Optionally, the center of the top surface of the bottom plate is fixedly connected with a mounting block, and the two ends of the inclined support rod are arranged in a bent manner, and the bent portions of the two ends of the inclined support rod are respectively detachably connected to the bottom surface of the connection plate and the side surface of the mounting block through bolts.

[0011] By adopting the technical scheme, the inclined support rod is convenient to disassemble and assemble.

[0012] Optionally, the inclined support rod is arranged in two groups in parallel along the width direction of the bottom plate.

[0013] By adopting the technical scheme, the support position and the support quantity of the inclined support rod are increased, and the stability of the support of the inclined support rod on the support arch plate is improved.

[0014] Optionally, the support arch plate comprises two unit arch plates arranged in a symmetrical manner, and the side surfaces of the two unit arch plates are respectively provided with a slot, the connection plate is inserted from the side surface of the unit arch plate, and the two ends of the connection plate are respectively inserted into the two slots, the two ends of one side of the connection plate are fixedly connected with a limiting plate, the side surface of the unit arch plate is further provided with a limiting slot for embedding the limiting plate, the limiting slot is in communication with the slot in a corresponding manner, and the opening size of the limiting slot is greater than that of the slot, and the limiting plate is detachably connected into the limiting slot through bolts.

[0015] By adopting the technical scheme, the support arch plate comprises two unit arch plates arranged in a symmetrical manner, so that the support arch plate as a whole is detachable, convenient to carry and transport, and the connection plate is also convenient to disassemble, so that the overall disassembly of the temporary support structure is facilitated, and the temporary support structure is convenient to reuse.

[0016] Optionally, the middle portion of the top surface of the connection plate is fixedly connected with two support top plates arranged in parallel, one side of the two unit arch plates close to each other is provided with a support slot for inserting the top end of the support top plate, the support slot penetrates the inner wall of the unit arch plate, and the top surface of the support top plate abuts against the top wall of the support slot.

[0017] By adopting the technical scheme, the stability of the connection between the two unit arch plates is improved, and the support strength of the unit arch plate on the inner wall of the tunnel is also improved.

[0018] Optionally, the side surface of the support top plate is detachably connected to the unit arch plate through bolts.

[0019] Optionally, the bottom surface of the bottom plate is fixedly connected with a plurality of support blocks, the bottom surface of the support block is arranged in a flush manner with the bottom surface of the support arch plate, and the pin is punched into the ground from the support block.

[0020] By adopting the technical scheme, the support block can support the hollowed part at the bottom of the bottom plate, and reduce the possibility of the middle part of the bottom plate collapsing when the pin is punched.

[0021] In summary, the present application has at least one of the following beneficial technical effects:

[0022] 1. When back-tunneling, the temporary inner support of the present application is placed in the tunnel, multiple temporary inner supports can be placed equidistantly according to the actual situation, and the bottom plate is fixed to the ground in the tunnel through the pin. The outer wall of the support arch plate supports the inner wall of the tunnel, so that the soil layer is not easy to loosen and fall down. At the same time, the inclined support rod is arranged, so that the inner wall of the temporary support of the present application has a plurality of triangular structures, thereby improving the stability of the temporary support of the present application.

[0023] 2. The arrangement of the connecting plate helps to further improve the structural stability of the temporary support. At the same time, the connecting plate is convenient to disassemble and assemble, and the support arch plate as a whole can be disassembled and assembled, so that the temporary support structure as a whole can be disassembled and assembled, and the temporary support structure as a whole can be disassembled and assembled, thereby facilitating repeated use.

[0024] 3. The support top plate helps to improve the stability of the connection between the two unit arch plates, and at the same time, the support strength of the unit arch plate to the inner wall of the tunnel is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall structure of a temporary inner support for back-tunneling according to an embodiment of the present application.

[0026] Figure 2 is a schematic diagram of the structure of a first mounting groove according to an embodiment of the present application.

[0027] Figure 3 is Figure 2 is an enlarged view of A in FIG.

[0028] BRIEF DESCRIPTION OF DRAWINGS 1, support arch plate; 11, first mounting groove; 12, second mounting groove; 13, unit arch plate; 14, insertion groove; 15, support groove; 2, bottom plate; 21, pin; 22, support block; 3, inclined support rod; 4, connecting plate; 5, mounting block; 6, limiting plate; 61, limiting groove; 7, support top plate. DETAILED DESCRIPTION

[0029] The following will be described in detail in combination with the accompanying Figures 1-3 The present application will be further described in detail.

[0030] The present application discloses a temporary inner support for back-tunneling. Referring to Figures 1-3The application discloses a temporary inner support for a counter-blasting tunnel, which comprises a support arch plate 1, a bottom plate 2 and an inclined support rod 3. First and second installation grooves 11 and 12 are formed in the bottom of the inner wall of the support arch plate 1. The first installation groove 11 is a blind groove, and the second installation groove 12 is a through groove. One end of the bottom plate 2 is inserted into the first installation groove 11, and the other end of the bottom plate 2 is inserted into the second installation groove 12. The two ends of the bottom plate 2 are fixed in the first and second installation grooves 11 and 12 by bolts, respectively. The bottom plate 2 is also fixed to the ground in the tunnel by a pin 21.

[0031] The inclined support rod 3 is symmetrically arranged on both sides of the central axis of the bottom plate 2. The highest end of the inclined support rod 3 is away from the center of the bottom plate 2 compared with the lowest end. The highest end of the inclined support rod 3 is fixedly connected to the inner wall of the support arch plate 1 by a connecting piece. The lowest end of the inclined support rod 3 is fixedly connected to the center of the bottom plate 2. When counter-blasting a tunnel, the temporary inner support is placed in the tunnel. According to actual conditions, multiple temporary inner supports can be placed at equal intervals. The bottom plate 2 is fixed to the ground in the tunnel by the pin 21. The outer wall of the support arch plate 1 supports the inner wall of the tunnel, so that the soil layer is not easy to loosen and fall down. The arrangement of the inclined support rod 3 makes the inner wall of the temporary support have multiple triangular structures, thereby improving the stability of the temporary support.

[0032] A plurality of support blocks 22 are fixedly connected to the bottom surface of the bottom plate 2. The bottom surface of the support block 22 is arranged in a flush manner with the bottom surface of the support arch plate 1. The pin 21 is punched into the ground from the support block 22. The support block 22 can support the hollowed part at the bottom of the bottom plate 2, thereby reducing the possibility of the middle part of the bottom plate 2 collapsing when the pin 21 is punched.

[0033] The connecting piece is a connecting plate 4. The two ends of the connecting plate 4 are fixedly connected to the inner wall of the support arch plate 1. The highest end of the inclined support rod 3 is fixedly connected to the bottom surface of the connecting plate 4. The arrangement of the connecting plate 4 is helpful to further improve the structural stability of the temporary support. An installation block 5 is fixedly connected to the center of the top surface of the bottom plate 2. The two ends of the inclined support rod 3 are arranged in a bent manner. The bent parts of the two ends of the inclined support rod 3 are detachably connected to the bottom surface of the connecting plate 4 and the side surface of the installation block 5 by bolts, respectively. The detachable connection of the bent parts of the two ends of the inclined support rod 3 to the connecting plate 4 and the installation block 5 is convenient for the disassembly and assembly of the inclined support rod 3. Two groups of the inclined support rods 3 are arranged in parallel along the width direction of the bottom plate 2. The arrangement of the two groups of the inclined support rods 3 increases the support positions and the support quantity of the inclined support rods 3, and is helpful to improve the stability of the support arch plate 1 supported by the inclined support rods 3.

[0034] The support arch plate 1 comprises two symmetrically arranged unit arch plates 13, the side surface of the two unit arch plates 13 is provided with a slot 14, the connecting plate 4 is inserted from the side surface of the unit arch plate 13, and the two ends of the connecting plate 4 are respectively inserted into the two slots 14, the two ends of one side of the connecting plate 4 are fixedly connected with a limiting plate 6, the side surface of the unit arch plate 13 is also provided with a limiting slot 61 for embedding the limiting plate 6, the limiting slot 61 is in communication with the slot 14, and the opening size of the limiting slot 61 is greater than that of the slot 14, and the limiting plate 6 is detachably connected in the limiting slot 61 through bolts. The support arch plate 1 comprises two symmetrically arranged unit arch plates 13, so that the whole support arch plate 1 is detachable, and is convenient for carrying and transporting, meanwhile, the connecting plate 4 is also convenient for disassembling, so that the whole temporary support structure is convenient for disassembling and reusing.

[0035] The top surface of the connecting plate 4 is fixedly connected with two parallel arranged support top plates 7, one side of the two unit arch plates 13 is provided with a support slot 15 for inserting the top end of the support top plate 7, the support slot 15 penetrates the inner wall of the unit arch plate 13, and the top surface of the support top plate 7 abuts against the top wall of the support slot 15, which helps to improve the stability of the connection between the two unit arch plates 13, and meanwhile, the support strength of the unit arch plate 13 to the inner wall of the tunnel is improved. The side surface of the support top plate 7 is detachably connected with the unit arch plate 13 through bolts.

[0036] The implementation principle of the temporary inner support of the backbreaking tunnel in the embodiment of the application is as follows: when the backbreaking tunnel is formed, the temporary inner support of the application is placed in the tunnel, a plurality of temporary inner supports can be placed at equal intervals according to the actual situation, the bottom plate 2 is fixed on the ground in the tunnel through the pin 21, and the outer wall of the support arch plate 1 supports the inner wall of the tunnel, so that the soil layer is not easy to loosen and fall down, meanwhile, the setting of the inclined support rod 3 makes the inner wall of the temporary support of the application in a plurality of triangular structures, and the stability of the temporary support of the application is improved.

[0037] The above are the preferred embodiments of the application, and do not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape and principle of the application should be covered in the protection scope of the application.

Claims

1. A counterfort tunnel temporary inner support, characterized by: The utility model provides a tunnel support structure, including support arch board (1), bottom plate (2) and diagonal bracing (3), the bottom of inside wall of support arch board (1) is equipped with first installation groove (11) and second installation groove (12), first installation groove (11) is blind slot, second installation groove (12) is through slot, one end of bottom plate (2) is inserted in first installation groove (11), the other end of bottom plate (2) is inserted in second installation groove (12), and both ends of bottom plate (2) are fixed in first installation groove (11) and second installation groove (12) respectively through bolt, bottom plate (2) is still fixed in the ground of tunnel through pin (21); Diagonal bracing (3) is symmetrically arranged in the both sides of the central axis of bottom plate (2), the highest end of diagonal bracing (3) is away from the center of bottom plate (2) compared with the lowest end, the highest end of diagonal bracing (3) is fixedly connected with the inner wall of support arch board (1) through connecting piece, and the lowest end of diagonal bracing (3) is fixedly connected at the center of bottom plate (2).

2. A temporary roof support according to claim 1, wherein: Connecting piece is connecting plate (4), both ends of connecting plate (4) are fixedly connected with the inner wall of support arch board (1), and the highest end of diagonal bracing (3) is fixedly connected to the bottom surface of connecting plate (4).

3. A kick tunnel temporary inner support according to claim 2, wherein: The center of the top surface of bottom plate (2) is fixedly connected with mounting block (5), both ends of diagonal bracing (3) are arranged in a bent mode, and the bent portions of both ends of diagonal bracing (3) are detachably connected to the bottom surface of connecting plate (4) and the side surface of mounting block (5) through bolts respectively.

4. A temporary roof support according to claim 3, wherein: Two groups of diagonal bracing (3) are arranged in parallel along the width direction of bottom plate (2).

5. A temporary roof support according to claim 2, wherein: Support arch board (1) comprises two symmetrically arranged unit arch boards (13), and the side surface of each unit arch board (13) is provided with a insertion slot (14), connecting plate (4) is inserted from the side surface of unit arch board (13), both ends of connecting plate (4) are inserted into two insertion slots (14) respectively, the both ends of one side of connecting plate (4) are fixedly connected with a limiting plate (6), the side surface of unit arch board (13) is also provided with a limiting slot (61) for embedding limiting plate (6), the limiting slot (61) is in communication with insertion slot (14) in a corresponding mode, the opening size of limiting slot (61) is greater than that of insertion slot (14), and limiting plate (6) is detachably connected into limiting slot (61) through a bolt.

6. A kick tunnel temporary inner support according to claim 5, wherein: The middle portion of the top surface of connecting plate (4) is fixedly connected with two support top plates (7) arranged in parallel, one side of each of two unit arch boards (13) is provided with a support slot (15) for inserting the top end of support top plate (7), the support slot (15) penetrates the inner wall of unit arch board (13), and the top surface of support top plate (7) abuts against the top wall of support slot (15).

7. A kick tunnel temporary inner support according to claim 6, wherein: The side surface of support top plate (7) is detachably connected to unit arch board (13) through a bolt.

8. A kick tunnel temporary inner support according to claim 1, wherein: The bottom surface of bottom plate (2) is fixedly connected with a plurality of support blocks (22), the bottom surface of support block (22) is arranged in a flush mode with the bottom surface of support arch board (1), and pin (21) is punched into the ground from support block (22).

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