A combined support device for urban dark excavation tunnels

Abstract

The present invention discloses a combined support device for an urban dark excavation tunnel, comprising a plurality of buffer anchoring monomers, wherein adjacent buffer anchoring monomers are connected by anchoring monomers; the buffer anchoring monomer comprises a first fixing ring, a limiting ring is arranged on the outer side of the first fixing ring, a first anchoring block and a plurality of second anchoring blocks are circumferentially slidably connected to the limiting ring, a third anchoring block is arranged between adjacent second anchoring blocks and between the first anchoring block and the second anchoring block; adjacent first anchoring blocks and third anchoring blocks and adjacent second anchoring blocks and third anchoring blocks are connected by buffer anchoring assemblies; the inner sides of the first anchoring block, the plurality of second anchoring blocks and the plurality of third anchoring blocks are all against the buffer pad. The combined support device for an urban dark excavation tunnel of the present invention solves the problems of the prior art that the tunnel structure construction process is difficult and cumbersome, the construction flexibility is poor, the overall structure of the tunnel leads to difficulty in maintenance, the compressive strength is poor, and the service life is short.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel support, and in particular to a combined support device for an urban dark-excavated tunnel. Background Art

[0002] In the process of urban construction, it is necessary to lay more than two municipal pipelines such as electricity, communications, gas, water supply, heat, and drainage in underground public tunnels, and implement unified planning, design, construction, and maintenance; in current technology, some cities mostly use anchor rods to fix earth walls to lay tunnels. The construction flexibility of anchor grouting of this type of tunnel structure is poor. After construction, the tunnel is an integral structure and difficult to maintain. In addition, the service life of the existing structure is greatly reduced under the triple tearing of gravity, weighing shear force, and horizontal tension of the soil layer, which will have a greater restriction and impact on construction, and the tunnel structure has poor compressive resistance. The applicant has been engaged in tunnel construction for a long time and found that the construction process of the existing tunnel structure is difficult and cumbersome, the construction flexibility is poor, the overall structure of the tunnel leads to difficulty in maintenance, poor compressive resistance, and a short service life.

[0003] Therefore, it is necessary to develop a combined supporting device for urban dark excavation tunnels in view of the above-mentioned defects. Summary of the invention

[0004] The purpose of the present invention is to provide a combined support device for an urban dark-excavated tunnel, which can solve the problems of the prior art tunnel structure having a difficult and cumbersome construction process, poor construction flexibility, difficulty in maintenance due to the overall structure of the tunnel, poor compressive resistance and short service life.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention discloses a combined supporting device for an urban dark excavation tunnel, comprising a plurality of buffer anchoring monomers, wherein adjacent buffer anchoring monomers are connected by pulling anchoring monomers; the buffer anchoring monomer comprises a first fixing ring, a limiting ring is coaxially arranged on the outer side of the first fixing ring, a first anchoring block and a plurality of second anchoring blocks are circumferentially slidably connected to the limiting ring, a third anchoring block is arranged between adjacent second anchoring blocks and between adjacent first anchoring blocks and second anchoring blocks, and the third anchoring block is slidably connected to the limiting ring; adjacent first anchoring blocks and third anchoring blocks and adjacent second anchoring blocks are connected by a buffer anchoring assembly, and the buffer anchoring assembly is connected to the limiting ring; a buffer pad is sleeved on the outer side of the first fixing ring, and the inner sides of the first anchoring block, the plurality of second anchoring blocks and the plurality of third anchoring blocks are all against the buffer pad; a structure formed by connecting the outer sides of the first anchoring block, the plurality of second anchoring blocks and the plurality of third anchoring blocks surrounds the outer side of the limiting ring.

[0007] Furthermore, the anchor unit includes a second fixing ring detachably connected to the first fixing ring, and the outer side of the second fixing ring is wrapped with an anchor assembly; the anchor assembly includes a plurality of first fixing blocks arranged at intervals along the circumferential direction on the outer side of the second fixing ring; a plurality of second fixing blocks are arranged at intervals along the axial direction of the second fixing ring between adjacent first fixing blocks, the first fixing blocks are engaged with the second fixing blocks, and the first fixing blocks are fixed to adjacent limiting rings; a plurality of pulling seats are provided on the second fixing block, and first pulling rods are installed between the pulling seats at different positions, and the plurality of first pulling rods on the second fixing block are staggered; a first anchoring plate is provided at the top of the anchor assembly, and two ends of the first anchoring plate are respectively connected to two adjacent buffer anchoring monomers, and a second anchoring plate is provided at the bottom, and two ends of the second anchoring plate are respectively connected to two adjacent buffer anchoring monomers, and a plurality of second pulling rods are arranged at intervals along the circumferential direction of the anchor assembly between the first anchoring plate and the second anchoring plate, and the second pulling rods are installed between two adjacent buffer anchoring monomers.

[0008] Furthermore, the first anchor block includes a first slide plate that is slidably connected to the limit ring; a first support plate is vertically installed on the first slide plate; both ends of the first support plate away from the first slide plate are provided with first installation grooves adapted to the buffer anchor assembly; a limit frame is slidably connected to the first support plate, the limit frame is fixed to the outer side of the limit ring, and a plurality of the limit frames are symmetrically installed on both sides of the first slide plate.

[0009] Furthermore, the buffer anchor assembly includes a sleeve passing through and fixed on the limiting ring, a sleeve rod passing through and slidably connected to the sleeve, a buffer support plate is installed on the end of the sleeve rod away from the sleeve, and a tensioning spring is sleeved on the outer side of the sleeve; the two ends of the tensioning spring are respectively fixedly connected to the limiting ring and the buffer support plate; the buffer support plate is an arc-shaped structure that is tangent to the first anchor block, the second anchor block or the third anchor block on both sides.

[0010] Furthermore, the second anchor block includes a second slide plate slidably connected to the limit ring, a second support plate is vertically installed on the second slide plate, and both ends of the second support plate away from the second slide plate are provided with second installation grooves adapted to the buffer anchor assembly; the third anchor block has the same structure as the second anchor block.

[0011] Furthermore, a plurality of fixing spikes are provided on a side of the buffer support plate, the first support plate and the second support plate away from the first fixing ring.

[0012] Furthermore, a push-up inclined surface is provided on one side of the first slide plate, and the push-up inclined surface is connected to two adjacent surfaces on the first slide plate through an arc surface; and the second slide plate has the same structure as the first slide plate.

[0013] Further, the second fixing ring includes a first fixing plate with both ends simultaneously engaged with the first fixing ring, two first fixing plates are symmetrically provided on both sides of the first fixing ring, a second fixing plate is provided between the two first fixing plates, two second fixing plates are provided, and a structural shape formed by splicing the two first fixing plates is the same as the shape of the first fixing ring; a first clamping groove is provided on the outer side of the first fixing plate, and a first clamping protrusion adapted to the first clamping groove is provided on the inner side of the second fixing plate; second clamping protrusions are provided on the outer side of both ends of the first fixing plate, and a second clamping groove adapted to the second clamping protrusion is provided on the inner side of the first fixing ring; third clamping protrusions are provided on the outer side of both ends of the second fixing plate, and a third clamping groove adapted to the third clamping protrusion is provided on the inner side of the first fixing ring, and a first fastener connected to the first fixing ring is penetrated and connected to the third clamping protrusion.

[0014] Furthermore, a plurality of anchor rods are fixedly passed through the first anchor plate and the second anchor plate; and a sliding groove adapted to the limiting frame is provided on the second anchor plate.

[0015] Furthermore, the second pull rod is parallel to the axial direction of the second fixing ring.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are:

[0017] The present invention provides a combined support device for an urban underground tunnel. Through the provision of a buffer anchoring unit, pre-tightening and installation can be performed based on the cooperation of a buffer pad during installation, and the installation is more secure. In addition, through the cooperation of the buffer pad and the buffer anchoring assembly, the pressure caused by the outside can be better coped with, and each anchor block has a certain movement and rebound space, and has a stronger pressure resistance, thereby ensuring a sufficient service life. Through the provision of the pulling anchor unit, the buffer anchoring unit can be better limited and supported and fixed, and the installation stability is better. In addition, the structure of the pulling anchor unit is a split structure, which has higher construction flexibility, is easy to disassemble during inspection, and is more convenient to maintain. The buffer anchoring unit only needs to be pressed into the first fixing ring to complete the installation, and the pulling anchor unit completes the installation after the parts are clamped and locked. The installation steps are simple and convenient, and the construction efficiency is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the combined supporting device for urban dark excavation tunnels of the present invention;

[0020] Figure 2 It is a schematic diagram of the main structure of the combined supporting device for urban dark excavation tunnels of the present invention;

[0021] Figure 3 It is a three-dimensional structural schematic diagram of the remaining structures of the present invention except the anchor assembly;

[0022] Figure 4 For along Figure 2 The cross-sectional structure diagram along the AA line;

[0023] Figure 5 The anchor rod is installed along the Figure 2 The cross-sectional structure diagram of the middle BB line;

[0024] Figure 6 For along Figure 2 Cross-sectional structural diagram of the center CC line;

[0025] Figure 7 The first fixing ring is not installed. Figure 2 The cross-sectional structure diagram along the AA line;

[0026] Figure 8 for Figure 4 Schematic diagram of the enlarged structure at D in the middle;

[0027] Fig. 9 for Figure 7 Schematic diagram of the enlarged structure at E in the middle.

[0028] Explanation of the reference numerals: 1. Buffer anchoring unit; 2. Pull anchoring unit; 3. Fixing thorn; 11. First fixing ring; 12. Limiting ring; 13. First anchoring block; 14. Second anchoring block; 15. Third anchoring block; 16. Buffer anchoring assembly; 17. Buffering pad; 21. Second fixing ring; 22. Pull anchoring assembly; 23. First anchoring plate; 24. Second anchoring plate; 25. Second pull rod; 26. Anchor rod; 131. First slide plate; 132. First support plate; 133. Limiting frame; 141. Second slide plate; 142. Second support plate; 161. Sleeve; 162. Sleeve rod; 163. Buffer support plate; 164. Tension spring; 211. First fixing plate; 212. Second fixing plate; 213. First fastener; 221. First pull block; 222. Second pull block; 223. First pull rod; 1311. Pushing inclined plane. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] Please also read Figures 1 to 9 Now, a specific embodiment of a combined support device for urban underground tunnels provided by the present invention is described. The combined support device for urban underground tunnels includes a plurality of buffer anchoring monomers 1, and adjacent buffer anchoring monomers 1 are connected by anchoring monomers 2; the buffer anchoring monomer 1 includes a first fixing ring 11, and a limiting ring 12 is coaxially arranged on the outer side of the first fixing ring 11, and the limiting ring 12 is circumferentially slidably connected with a first anchoring block 13 and a plurality of second anchoring blocks 14, and a third anchoring block 15 is arranged between adjacent second anchoring blocks 14 and between adjacent first anchoring blocks 13 and second anchoring blocks 14, and the third anchoring block 15 is slidably connected with the limiting ring 12; adjacent The first anchor block 13 and the third anchor block 15, and the adjacent second anchor blocks 14 and the third anchor blocks 15 are connected by a buffer anchor assembly 16, and the buffer anchor assembly 16 is connected to the limiting ring 12; a buffer pad 17 is installed on the outer side of the first fixing ring 11, and the inner sides of the first anchor block 13, several second anchor blocks 14 and several third anchor blocks 15 are all against the buffer pad 17; the structure formed by connecting the outer sides of the first anchor block 13, several second anchor blocks 14 and several third anchor blocks 15 is surrounded by the outer side of the limiting ring 12.

[0032] For illustration purposes, see Figure 1 , take any point in the space as the origin, take the setting direction of the limit ring 12 relative to the first anchor block 13 as the Z axis, take the setting direction of the buffer anchor monomer 1 relative to the pull anchor monomer 2 as the X axis, and take the straight line direction perpendicular to both the X axis and the Z axis as the Y axis to establish a rectangular coordinate system, wherein the XY plane is a horizontal plane, the direction indicated on the horizontal plane is the horizontal direction, and the direction indicated by the Z axis is the vertical direction.

[0033] In this embodiment, three second anchor blocks 14 are provided, which are respectively located at the top and the left and right sides, and one first anchor block 13 is provided at the bottom; four third anchor blocks 15 are provided; three second anchor blocks 14, one first anchor block 13 and four third anchor blocks 15 form an octagonal structure; the first fixing ring 11 and the limiting ring 12 are both octagonal structures; the buffer anchor assembly 16 is an arc-shaped structure that is simultaneously engaged with the structures on both sides, and the buffer anchor assembly 16 is engaged with the outside of the anchor block and moves with the movement of the anchor block. The buffer pad 17 is made of elastic material. During installation, according to the required installation position, the limiting ring 12 is moved to the corresponding position and the first fixing ring 11 is pressed into the limiting ring 12. While pressing in, the first anchor block 13, several second anchor blocks 14 and third anchor blocks 15 on the limiting ring 12 are pushed out, and at the same time, several buffer anchor assemblies 16 located on the outside are pushed out to abut against the side wall of the tunnel to complete the support. The anchor unit 2 is installed on the basis of the buffer anchor assembly 16 , and the next buffer anchor assembly 16 is fixed on the other side of the anchor unit 2 with the position of the anchor unit 2 as a reference.

[0034] Compared with the prior art, this urban dark tunnel joint support device can be pre-tightened and installed based on the cooperation of the buffer pad 17 during the installation process through the setting of the buffer anchoring monomer 1, and the installation firmness is better; in addition, the cooperation of the buffer pad 17 and the buffer anchor assembly 16 can better cope with the pressure caused by the outside, and each anchor block has a certain movement and rebound space, and the pressure resistance is stronger, thereby ensuring a sufficient service life; the setting of the anchoring monomer 2 can better limit the support and fix the buffer anchoring monomer 1, and the installation stability is better. In addition, the structure of the anchoring monomer 2 is a split structure, which has higher construction flexibility, is easy to disassemble during maintenance, and is more convenient for maintenance; the buffer anchoring monomer 1 only needs to be pressed into the first fixing ring 11 to complete the installation, and the anchoring monomer 2 completes the installation after the parts are locked and tightened. The installation steps are simple and convenient, and the construction efficiency is effectively improved. The device solves the problems of the prior art tunnel structure construction process being difficult and cumbersome, poor construction flexibility, and the overall structure of the tunnel causing difficulty in maintenance, poor pressure resistance, and short service life.

[0035] In a specific embodiment of the present invention, the anchor unit 2 includes a second fixing ring 21 detachably connected to the first fixing ring 11, and the outer side of the second fixing ring 21 is wrapped with an anchor assembly 22; the anchor assembly 22 includes a plurality of first traction blocks 221 arranged at intervals along the circumferential direction on the outer side of the second fixing ring 21; a plurality of second traction blocks 222 are arranged at intervals along the axial direction of the second fixing ring 21 between adjacent first traction blocks 221, and the first traction blocks 221 and the second traction blocks 222 are engaged with each other, and the first traction blocks 221 are fixed on the adjacent limiting ring 12; the second traction blocks 22 2 is provided with a plurality of pull seats, and a first pull rod 223 is installed between the pull seats at different positions, and the plurality of first pull rods 223 on the second pull block 222 are staggered; the top of the pull anchor assembly 22 is provided with a first anchor plate 23 whose two ends are respectively connected to two adjacent buffer anchor monomers 1, and the bottom is provided with a second anchor plate 24 whose two ends are respectively connected to two adjacent buffer anchor monomers 1, and a plurality of second pull rods 25 are arranged between the first anchor plate 23 and the second anchor plate 24 along the circumferential direction of the pull anchor assembly 22, and the second pull rod 25 is installed between two adjacent buffer anchor monomers 1.

[0036] In this embodiment, a plurality of anchor rods 26 are fixedly passed through the first anchor plate 23 and the second anchor plate 24 ; the second pull rod 25 is parallel to the axial direction of the second fixing ring 21 . During installation, on the basis of the buffer anchoring monomer 1, the first anchoring plate 23 and the second anchoring plate 24 are fixed to the first anchoring block 13 and the second anchoring block 14 by bolts; the anchor rod 26 is passed through the first anchoring plate 23 and the second anchoring plate 24 and fixed in the tunnel side wall; the next buffer anchoring monomer 1 is installed on the basis of the first anchoring plate 23, and the second tie rod 25 is fixed between the two installed buffer anchoring monomers 1; a plurality of second tie blocks 222 and a plurality of first tie rods 223 are assembled together in advance, the first tie block 221 is installed between the two buffer anchoring monomers 1 by bolts, and the second tie block 222 is clamped and fixed between the two first tie blocks 221; the second tie block 222 is provided with a T-shaped convex buckle, and the first tie block 221 is provided with a plurality of recesses adapted to the convex buckle; the second fixing ring 21 is pressed against the inner sides of the plurality of first tie blocks 221 and the second tie block 222 and is installed and fixed with the two buffer anchoring monomers 1. This structure is easy to disassemble and repair, has better fixing and limiting effects, and provides greater support stability.

[0037] In a specific embodiment of the present invention, the first anchor block 13 includes a first slide plate 131 that is slidably connected to the limit ring 12; a first support plate 132 is installed at the bottom of the first slide plate 131, and the first support plate 132 is perpendicular to the first slide plate 131; both ends of the first support plate 132 away from the first slide plate 131 are provided with first installation grooves adapted to the buffer anchor assembly 16; a limit frame 133 is slidably connected to the first support plate 132, and the limit frame 133 is fixed to the outer side of the bottom of the limit ring 12, and a plurality of limit frames 133 are symmetrically installed on both sides of the first slide plate 131.

[0038] In this embodiment, a push slope 1311 is provided on one side of the first slide plate 131, and the push slope 1311 is connected to the two adjacent surfaces on the first slide plate 131 through an arc surface, and the push slope 1311 is against the first fixing ring 11; the second anchor plate 24 is provided with a sliding groove adapted to the limit frame 133, and the second anchor plate 24 better limits the installation position and direction of the buffer anchoring unit 1.

[0039] In a specific embodiment of the present invention, the buffer anchor assembly 16 includes a sleeve 161 that passes through and is fixed on the limit ring 12, and a sleeve rod 162 is slidably connected to the sleeve 161. A buffer support plate 163 is installed on the end of the sleeve rod 162 away from the sleeve 161, and a tensioning spring 164 is sleeved on the outer side of the sleeve 161. The tensioning spring 164 can generate compression and rebound when subjected to external pressure, so that the buffer support plate 163 and each anchor block have a certain amount of moving space and stronger pressure resistance; the two ends of the tensioning spring 164 are respectively fixedly connected to the limit ring 12 and the buffer support plate 163; the buffer support plate 163 is an arc-shaped structure that is tangent to the first anchor block 13, the second anchor block 14 or the third anchor block 15 on both sides.

[0040] In a specific embodiment of the present invention, the second anchor block 14 includes a second slide plate 141 that is slidably connected to the limit ring 12, and a second support plate 142 is installed at the bottom of the second slide plate 141, and the second support plate 142 is perpendicular to the second slide plate 141; the second slide plate 141 has the same structure as the first slide plate 131, and both ends of the second support plate 142 away from the second slide plate 141 are provided with second installation grooves adapted to the buffer anchor assembly 16; the third anchor block 15 has the same structure as the second anchor block 14, and the difference lies in the size.

[0041] In this embodiment, the buffer support plate 163, the first support plate 132 and the second support plate 142 are all provided with a plurality of fixing spikes 3 on the side away from the first fixing ring 11. When the first fixing ring 11 is installed, each anchor block is gradually pushed into place by the pushing inclined surface 1311. Here, as long as the above-mentioned fixing spikes 3, the buffer support plate 163, the first support plate 132 and the second support plate 142 can achieve the relevant performance functions, they are all within the scope of protection of this application document.

[0042] In a specific embodiment of the present invention, the second fixing ring 21 includes a first fixing plate 211 whose two ends are simultaneously engaged with the first fixing ring 11, two first fixing plates 211 are symmetrically provided on both sides of the first fixing ring 11, a second fixing plate 212 is provided between the two first fixing plates 211, and two second fixing plates 212 are provided, and the structural shape formed after being assembled with the two first fixing plates 211 is the same as the shape of the first fixing ring 11; a first clamping groove is provided on the outer side of the first fixing plate 211, and a first clamping protrusion adapted to the first clamping groove is provided on the inner side of the second fixing plate 212; second clamping protrusions are provided on the outer sides of both ends of the first fixing plate 211, and a second clamping groove adapted to the second clamping protrusion is provided on the inner side of the first fixing ring 11; third clamping protrusions are provided on the outer sides of both ends of the second fixing plate 212, and a third clamping groove adapted to the third clamping protrusion is provided on the inner side of the first fixing ring 11, and a first fastener 213 connected to the first fixing ring 11 is connected through the third clamping protrusion.

[0043] During installation, firstly, the second protrusions on the two first fixing plates 211 are engaged with the second grooves in the two first fixing rings 11, and then the two second fixing plates 212 are engaged with the inner sides of the two first fixing plates 211 to limit the first fixing plates 211, and then the two second fixing plates 212 are fixed between the two first fixing rings 11 by the first fasteners 213. A sealing gasket is installed between the first fixing ring 11 and the second fixing ring 21, and a sealing gasket is also installed between the first fixing plate 211 and the second fixing plate 212.

[0044] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0045] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A combined support device for an urban dark excavation tunnel, characterized in that: The invention comprises a plurality of buffer anchoring monomers (1), wherein adjacent buffer anchoring monomers (1) are connected via anchoring monomers (2); the buffer anchoring monomer (1) comprises a first fixing ring (11), a limiting ring (12) is coaxially arranged on the outer side of the first fixing ring (11), a first anchoring block (13) and a plurality of second anchoring blocks (14) are circumferentially slidably connected to the limiting ring (12), third anchoring blocks (15) are arranged between adjacent second anchoring blocks (14) and between adjacent first anchoring blocks (13) and second anchoring blocks (14), and the third anchoring blocks (15) are slidably connected to the limiting ring (12); adjacent first anchoring blocks (13) and the The third anchor blocks (15) and the adjacent second anchor blocks (14) and the third anchor blocks (15) are connected via a buffer anchor assembly (16), and the buffer anchor assembly (16) is connected to the limiting ring (12); a buffer pad (17) is installed on the outer side of the first fixing ring (11), and the inner sides of the first anchor block (13), a plurality of the second anchor blocks (14) and a plurality of the third anchor blocks (15) are all in contact with the buffer pad (17); and a structure formed by connecting the outer sides of the first anchor block (13), a plurality of the second anchor blocks (14) and a plurality of the third anchor blocks (15) surrounds the outer side of the limiting ring (12).

2. The urban dark tunnel joint support device according to claim 1 is characterized in that: The anchor unit (2) comprises a second fixing ring (21) detachably connected to the first fixing ring (11), and the outer side of the second fixing ring (21) is wrapped with an anchor assembly (22); the anchor assembly (22) comprises a plurality of first fixing blocks (221) arranged at intervals along the circumferential direction on the outer side of the second fixing ring (21); a plurality of second fixing blocks (222) are arranged at intervals along the axial direction of the second fixing ring (21) between adjacent first fixing blocks (221), the first fixing blocks (221) and the second fixing blocks (222) are engaged with each other, and the first fixing blocks (221) are fixed on the adjacent limiting ring (12); the second fixing blocks (222) are provided with A plurality of pull seats, wherein a first pull rod (223) is installed between the pull seats at different positions, and the plurality of first pull rods (223) on the second pull block (222) are arranged in a staggered manner; the top of the pull anchor assembly (22) is provided with a first anchor plate (23) whose two ends are respectively connected to two adjacent buffer anchor monomers (1), and the bottom is provided with a second anchor plate (24) whose two ends are respectively connected to two adjacent buffer anchor monomers (1), and a plurality of second pull rods (25) are arranged between the first anchor plate (23) and the second anchor plate (24) along the circumferential direction of the pull anchor assembly (22), and the second pull rods (25) are installed between two adjacent buffer anchor monomers (1).

3. The urban dark tunnel joint support device according to claim 2 is characterized in that: The first anchor block (13) comprises a first slide plate (131) which passes through and is slidably connected to the limiting ring (12); a first support plate (132) is vertically mounted on the first slide plate (131); both ends of the first support plate (132) away from the first slide plate (131) are provided with first mounting grooves adapted to the buffer anchor assembly (16); a limiting frame (133) is slidably connected to the first support plate (132), the limiting frame (133) is fixed to the outer side of the limiting ring (12), and a plurality of the limiting frames (133) are symmetrically mounted on both sides of the first slide plate (131).

4. The urban dark tunnel joint support device according to claim 3 is characterized in that: The buffer anchor assembly (16) comprises a sleeve (161) passing through and fixed on the limiting ring (12); a sleeve rod (162) passing through and slidably connected to the sleeve (161); a buffer support plate (163) is installed at one end of the sleeve rod (162) away from the sleeve (161); a tension spring (164) is sleeved on the outer side of the sleeve (161); the two ends of the tension spring (164) are respectively fixedly connected to the limiting ring (12) and the buffer support plate (163); the buffer support plate (163) is an arc-shaped structure that is tangent to the first anchor block (13), the second anchor block (14) or the third anchor block (15) on both sides.

5. The urban dark tunnel joint support device according to claim 4 is characterized in that: The second anchor block (14) comprises a second slide plate (141) slidably connected to the limiting ring (12); a second support plate (142) is vertically mounted on the second slide plate (141); and both ends of the second support plate (142) away from the second slide plate (141) are provided with second mounting grooves adapted to the buffer anchor assembly (16); the third anchor block (15) has the same structure as the second anchor block (14).

6. The urban dark tunnel joint support device according to claim 5 is characterized in that: A plurality of fixing spikes (3) are provided on the side of the buffer support plate (163), the first support plate (132) and the second support plate (142) away from the first fixing ring (11).

7. The urban dark tunnel joint support device according to claim 5 is characterized in that: A push-up inclined surface (1311) is provided on one side of the first slide plate (131), and the push-up inclined surface (1311) and two adjacent surfaces on the first slide plate (131) are connected via arc surfaces; the second slide plate (141) has the same structure as the first slide plate (131).

8. The urban dark tunnel joint support device according to claim 2 is characterized in that: The second fixing ring (21) comprises a first fixing plate (211) whose two ends are simultaneously engaged with the first fixing ring (11); two first fixing plates (211) are symmetrically provided on both sides of the first fixing ring (11); a second fixing plate (212) is provided between the two first fixing plates (211); two second fixing plates (212) are provided, and a structural shape formed after being assembled with the two first fixing plates (211) is the same as the shape of the first fixing ring (11); a second fixing plate (212) is provided on the outer side of the first fixing plate (211); A clamping groove, a first clamping protrusion adapted to the first clamping groove is provided on the inner side of the second fixing plate (212); second clamping protrusions are provided on the outer sides of both ends of the first fixing plate (211), and a second clamping groove adapted to the second clamping protrusion is provided on the inner side of the first fixing ring (11); third clamping protrusions are provided on the outer sides of both ends of the second fixing plate (212), and a third clamping groove adapted to the third clamping protrusion is provided on the inner side of the first fixing ring (11), and a first fastener (213) connected to the first fixing ring (11) is penetrated and connected to the third clamping protrusion.

9. The urban dark tunnel joint support device according to claim 3 is characterized in that: A plurality of anchor rods (26) are fixedly passed through the first anchor plate (23) and the second anchor plate (24); and a sliding groove adapted to the limiting frame (133) is provided on the second anchor plate (24).

10. The urban dark tunnel joint support device according to any one of claims 2 to 9, characterized in that: The second pull rod (25) is parallel to the axial direction of the second fixing ring (21).

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