Tunnel supporting structure and construction method

Abstract

The invention relates to a tunnel supporting structure and a construction method.The tunnel supporting structure comprises at least one annular duct piece assembly arranged on the inner wall of a tunnel, the annular duct piece assembly comprises a plurality of arc-shaped plates, the arc-shaped plates are sequentially connected in the circumferential direction of the tunnel to form a closed annular duct piece structure, and one end of each arc-shaped plate is provided with a connecting part; a clamping part clamped with the connecting part is arranged at the other end of the connecting part; the first limiting assembly comprises two slidable fixing plates arranged on the connecting part and located on the two sides of the clamping part and an adjusting piece arranged on the connecting part and connected with the fixing plates. The adjusting piece is used for driving the fixing plate to move transversely, so that the fixing plate is connected with the side wall of the clamping part in an attached mode, and limiting and fixing between the arc-shaped plates are achieved. The connecting parts and the clamping parts are matched with the fixing plates and the adjusting pieces in the first limiting assemblies, so that the adjacent arc-shaped plates can be clamped more tightly, the gap problem caused by component tolerance in traditional splicing is avoided, and the hidden danger of water leakage and structural displacement is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and particularly relates to a tunnel support structure and a construction method thereof. Background Art

[0002] As an important part of urban rail transit, highway and railway construction, the structural stability and construction safety of tunnels are always key factors in the design and construction process. In order to ensure the stability of the tunnel structure, a segment lining structure is often used as the lining system. Among them, the annular segment assembly is widely used in shield tunnel construction due to its strong structural integrity, convenient construction and high load-bearing capacity.

[0003] The existing tunnel segment assemblies usually adopt reinforced concrete arc plates to be spliced into a closed annular structure and fixed by connecting pieces such as bolts and pins. However, this type of traditional connection structure is limited by the connection accuracy and component tolerances, and there are splicing gaps between the segments, which are likely to cause structural displacement or water leakage hazards during the later operation; moreover, the assembly process of the existing structure is relatively complex, which also increases the construction difficulty and time cost. Summary of the Invention

[0004] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a tunnel support structure and a construction method thereof, so as to solve the problems that the connection structure of the tunnel segment assembly in the prior art is limited by the connection accuracy and component tolerances, there are splicing gaps between the segments, which are likely to cause structural displacement or water leakage hazards during the later operation; moreover, the assembly process of the existing structure is relatively complex, which also increases the construction difficulty and time cost.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A tunnel support structure, comprising:

[0007] At least one annular segment assembly, arranged on the inner wall of the tunnel, the annular segment assembly includes a plurality of arc plates, and the arc plates are sequentially connected along the circumferential direction of the tunnel to form a closed annular segment structure, and one end of the arc plate is provided with a connection part, and the other end is provided with a clamping part that is clamped with the connection part;

[0008] A first limiting assembly, including two slidable fixing plates arranged on the connection part and located on both sides of the clamping part, and an adjusting part arranged on the connection part and connected with the fixing plate;

[0009] Wherein, the adjusting part is used to drive the fixing plate to move horizontally so that it fits and connects with the side wall of the clamping part, so as to realize the limiting and fixing between the arc plates.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. By providing a connecting portion and a clamping portion, in cooperation with the fixing plate and the adjusting member in the first limiting assembly, closer clamping between adjacent arc-shaped plates can be achieved, avoiding the gap problem caused by component tolerances in traditional assembly, and reducing the hidden dangers of water leakage and structural displacement.

[0012] 2. The limiting assembly not only enables the connection between the arc-shaped plates, but also plays a role in lateral limiting and supporting, effectively improving the anti-deformation ability of the segment structure during use, and further enhancing the overall stiffness and anti-seepage ability of the tunnel support system.

[0013] 3. Compared with the traditional precise alignment installation methods relying on bolts, pins, etc., the present invention adopts a combination of a clamping and sliding limiting structure for rapid assembly, significantly reducing the operation complexity during construction while maintaining the assembly strength, and effectively saving labor and time costs.

[0014] Further, the adjusting member includes:

[0015] A driving plate connected to the fixing plate;

[0016] An adjusting screw rod rotatably installed in the connecting portion, the adjusting screw rod being threadedly connected to the driving plate and used to drive the fixing plate to move along its axial direction.

[0017] Further, a limiting block is provided on one side of the driving plate close to the connecting portion, a limiting groove corresponding to the limiting block is formed on the side surface of the clamping portion, and the limiting block is configured to be clamped or separated from the limiting groove under the action of the adjusting screw rod.

[0018] Further, a connecting rod is also rotatably provided on the connecting portion, and both ends of the connecting rod are respectively connected to the two adjusting screw rods to realize synchronous adjustment of the movement of the two fixing plates.

[0019] Further, a groove is provided on the side wall of the connecting portion, an adjusting nut is provided at one end of the adjusting screw rod, and the adjusting nut is embedded in the groove.

[0020] Further, a second limiting assembly is further included, and the second limiting assembly includes:

[0021] A limiting plate;

[0022] A pushing member connected to the limiting plate, an installation cavity for installing the pushing member is provided on the limiting block, the limiting plate is located in the installation cavity and penetrates through the limiting block, and a locking groove corresponding to the limiting plate is formed on the clamping portion, and the locking groove is perpendicular to the limiting groove;

[0023] Wherein, the pushing member moves along the axial direction of the adjusting screw rod to drive the limiting plate to be inserted into or separated from the locking groove in the vertical direction.

[0024] Further, the pushing member includes a pushing block slidably arranged in the installation cavity along the axial direction of the adjusting screw rod; a fixing rod is arranged in the installation cavity, a reset plate is slidably connected to the side wall of the fixing rod, one end of the reset plate is connected to the limiting plate, a spring is sleeved outside the fixing rod, and two ends of the spring are respectively connected to the reset plate and the inner wall of the installation cavity, and the pushing block abuts against the limiting plate.

[0025] Further, the limiting plate is of a wedge-shaped structure, and its inclined surface is slidably matched with the pushing block to form an inclined self-locking fit.

[0026] Further, the adjacent two annular segment assemblies arranged along the tunnel length direction are spliced in a staggered joint manner.

[0027] A construction method for tunnel support, including the above-mentioned tunnel support structure, comprises the following steps:

[0028] Step 1: Splice a plurality of the arc-shaped plates in sequence along the circumferential direction of the tunnel, and assemble the plurality of arc-shaped plates one by one from bottom to top to assemble the annular segment assembly;

[0029] Step 2: Inject concrete into the arc-shaped plate, and after the concrete hardens and forms, an integrated concrete combined segment structure is formed. Description of the Drawings

[0030] Att Figure 1 : Structural schematic diagram of the tunnel support structure in this embodiment;

[0031] Att Figure 2 : Partial exploded schematic diagram of the annular segment assembly in this embodiment;

[0032] Att Figure 3 : Structural schematic diagram of the connecting part in the arc-shaped plate of this embodiment;

[0033] Att Figure 4 : Structural schematic diagram of the clamping part in the arc-shaped plate of this embodiment;

[0034] Att Figure 5 : Att Figure 3 Partial enlarged structural schematic diagram in;

[0035] Att Figure 6 : Structural schematic diagram of the adjusting screw rod in this embodiment;

[0036] Explanation of the reference numerals in the drawings:

[0037] 1. Ring segment assembly; 11. Arc plate; 111. Connection part; 112. Clamping part;

[0038] 2. First limit assembly; 21. Fixed plate; 22. Driving plate; 23. Adjusting screw; 24. Limit block; 25. Limit groove; 26. Connecting rod; 27. Adjusting nut;

[0039] 3. Second limit assembly; 31. Limit plate; 32. Locking groove; 33. Pushing block; 34. Fixed rod; 35. Reset plate; 36. Spring.

[0040] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0041] In order to make the object, technical solutions and beneficial effects of the present invention clearer, the technical solutions in the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0042] In the description of the present invention, it should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limited conditions under which the present invention can be implemented. Therefore, they do not have a technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the efficacy that the present invention can produce and the purpose that can be achieved, should still fall within the scope that the technical content disclosed by the present invention can cover. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of clear narration, and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

[0043] Embodiment 1

[0044] As Figures 1-6As shown in the figure, an embodiment of the present invention provides a tunnel support structure, comprising: at least one annular segment assembly 1, disposed on the inner wall of the tunnel, the annular segment assembly 1 including a plurality of arc-shaped plates 11, each of the arc-shaped plates 11 being sequentially connected along the circumferential direction of the tunnel to form a closed annular segment structure, and one end of the arc-shaped plate 11 being provided with a connecting portion 111 and the other end being provided with a clamping portion 112 that is clamped with the connecting portion 111; a first limiting assembly 2, including two slidable fixing plates 21 disposed on the connecting portion 111 and located on both sides of the clamping portion 112, and an adjusting member disposed on the connecting portion 111 and connected to the fixing plates 21; wherein, the adjusting member is used to drive the fixing plates 21 to move horizontally, so that they are in close contact with the side wall of the clamping portion 112, thereby realizing the limiting and fixing between the arc-shaped plates 11.

[0045] In the tunnel support structure of the present invention, during the tunnel construction process, after advancing to the designated position, the tunnel support structure is assembled. First, the construction workers sequentially install a plurality of arc-shaped plates 11 along the circumferential direction of the tunnel according to the design sequence. Each arc-shaped plate 11 is initially clamped with the clamping portion 112 at the other end of the previous arc-shaped plate 11 through the connecting portion 111 provided at one end to form a closed annular structure. After the initial clamping is completed, the two fixing plates 21 located on both sides of the connecting portion 111 are adjusted so that they are slidably installed at the preset position through the chute structure. At this time, the adjusting member is in a state to be adjusted. Then, the construction workers drive the two fixing plates 21 connected thereto to move horizontally synchronously through the adjusting member. As the fixing plates 21 move, their outer sides gradually come into close contact with the side wall of the clamping portion 112 of the adjacent arc-shaped plate 11, realizing radial limiting and pressing connection. This not only improves the assembly accuracy but also effectively prevents structural misalignment or gap enlargement caused by reasons such as vibration and eccentric load. Subsequently, each arc-shaped plate 11 in the same ring is installed and limited piece by piece according to the above steps, and finally a seamless and tightly fastened complete annular segment assembly 1 is formed. When installing the last arc-shaped plate 11, the connecting portion 111 is used to close the ring opening with the clamping portion 112 of the first plate, and the final locking operation is completed by relying on the first limiting assembly 2.

[0046] Specifically, as Figures 2-6As shown, in the embodiment of the present invention, the adjusting member includes a driving plate 22 connected to the fixing plate 21 and an adjusting screw 23 rotatably mounted on the connecting portion 111. The adjusting screw 23 is threadedly connected to the driving plate 22 and is used to drive the fixing plate 21 to move along its axial direction. When the clamping portion 112 penetrates into the connecting portion 111, by respectively rotating the adjusting screws 23 corresponding to the two fixing plates 21, the adjusting screws 23 rotate self - axially within the connecting portion 111, thereby driving the driving plate 22 to move axially along the adjusting screw 23 under the action of thread engagement. As the driving plate 22 moves, the fixing plate 21 connected thereto also slides axially and gradually presses against the side wall of the clamping portion 112 of the adjacent arc - shaped plate 11, achieving lateral limiting and pressing fit.

[0047] Meanwhile, a limiting block 24 is provided on one side of the driving plate 22 close to the connecting portion 111, and a limiting groove 25 corresponding to the limiting block 24 is formed on the side surface of the clamping portion 112. The limiting block 24 is configured to be clamped or separated from the limiting groove 25 under the action of the adjusting screw 23. As the adjusting screw 23 continues to rotate, the driving plate 22 drives the fixing plate 21 and the limiting block 24 to gradually move towards the clamping portion 112. When the limiting block 24 moves to a position aligned with the limiting groove 25, under the axial thrust of the adjusting screw 23, the limiting block 24 is pressed into the limiting groove 25, thereby realizing the clamping and limiting fixation of the connection of the arc - shaped plate 11. This not only effectively enhances the bonding firmness between the connecting portion 111 and the clamping portion 112, preventing the arc - shaped plate 11 from loosening or misaligning due to vibration, radial offset or external force disturbance, but also provides reliable shear resistance and assembly consistency through the mechanical cooperation between the limiting block 24 and the limiting groove 25, ensuring that the overall annular segment assembly 1 has good stability and durability during long - term use.

[0048] Secondly, to facilitate the simultaneous adjustment of the movement of the two fixing plates 21 so that they synchronously fit against the side walls of the clamping portions 112 of the adjacent arc - shaped plates 11, a connecting rod 26 is rotatably provided inside or outside the connecting portion 111. The two ends of the connecting rod 26 are respectively connected to the two adjusting screws 23 for realizing the linkage rotation of the two adjusting screws 23.

[0049] By providing the connecting rod 26, the two adjusting screws 23 can rotate synchronously under the application of force at the same operation point, and then drive the fixing plates 21 on both sides to symmetrically move axially at the same time, thereby realizing equal - amount limiting and fitting of the clamping portions 112 on both sides of the splicing seam. On the one hand, the operation process is simplified, and only one adjustment port needs to be operated to complete the two - way pressing adjustment, greatly improving the assembly efficiency and operation convenience; on the other hand, through the synchronous pressing of the fixing plates 21, problems such as uneven stress, misalignment or structural deformation caused by unilateral prior fastening are effectively avoided, improving the assembly consistency and connection stability of the annular segment assembly 1.

[0050] Again, a groove is provided on the side wall of the connecting portion 111. One end of the adjusting screw 23 is provided with an adjusting nut 27, and the adjusting nut 27 is embedded in the groove. By providing the groove, the adjusting nut 27 can be partially embedded inside the structure of the arc-shaped plate 11, thereby preventing the adjusting nut 27 from protruding outward and affecting the subsequent splicing and fitting between the segments, and improving the overall tightness and assembly accuracy of the structure.

[0051] In addition, the adjusting nut 27 can be designed in standard forms such as hexagonal, internal hexagonal or cross-slot, so as to cooperate with conventional tools such as wrenches and internal hexagonal wrenches for rotational adjustment. Construction workers can easily apply rotational torque to achieve efficient adjustment and locking operations of the adjusting screw 23, improving the adjustment efficiency.

[0052] Based on the above solution, as Figures 3-5 shown, the tunnel support structure in the embodiment of the present invention further includes a second limiting component 3. The second limiting component 3 includes a limiting plate 31 and a pushing member connected to the limiting plate 31. The limiting block 24 is provided with an installation cavity for installing the pushing member. The limiting plate 31 is located in the installation cavity and penetrates through the limiting block 24. The clamping portion 112 is provided with a locking groove 32 corresponding to the limiting plate 31, and the locking groove 32 is perpendicular to the limiting groove 25; wherein, the pushing member moves along the axial direction of the adjusting screw 23 to drive the limiting plate 31 to be inserted into or separated from the locking groove 32 in the vertical direction. By adding the second limiting component 3 to the first limiting component 2, the first limiting component 2 provides lateral direction limitation, and the second limiting component 3 provides vertical direction limitation to form two-way limitation, further enhancing the overall connection stability.

[0053] That is, when the limiting block 24 abuts against the inner wall of the limiting groove 25, the limiting plate 31 will move out from the inside and be inserted into the locking groove 32 under the action of the pushing member. Thus, the lateral limitation of two adjacent arc-shaped plates 11 is realized, and the longitudinal limitation of two adjacent arc-shaped plates 11 is also realized. The operation is simple and the implementation is convenient.

[0054] Specifically, the pushing member includes a pushing block 33 slidably disposed in the installation cavity along the axial direction of the adjusting screw 23; a fixing rod 34 is provided in the installation cavity, a reset plate 35 is slidably connected to the side wall of the fixing rod 34, one end of the reset plate 35 is connected to the limiting plate 31, a spring 36 is sleeved outside the fixing rod 34, and both ends of the spring 36 are respectively connected to the reset plate 35 and the inner wall of the installation cavity, and the pushing block 33 abuts against the limiting plate 31. When the pushing block 33 abuts against the inner wall of the limiting groove 25, the limiting plate 31 is pushed through the limiting block 24 and inserted into the locking groove 32 of the clamping portion 112 to complete vertical locking; at this time, during the pushing process, the spring 36 is compressed, and the reset plate 35 slides along with the fixing rod 34 to provide an elastic preload for subsequent automatic reset. That is, when the pushing force is removed or the pushing block 33 is moved in the opposite direction, the spring 36 returns to its original state, driving the reset plate 35 to return to its original position, and further driving the limiting plate 31 to withdraw from the locking groove 32 to realize automatic release of the limit.

[0055] Among them, the limiting plate 31 is of a wedge-shaped structure, and its inclined surface is slidably matched with the pushing block 33 to form an inclined self-locking fit. When the pushing block 33 contacts the inclined surface of the limiting plate 31, the force in the sliding direction of the pushing block 33 is converted into the force for the limiting plate 31 to move in the vertical direction, and then the limiting plate 31 is inserted into the locking groove 32. When the pushing block 33 moves in the reverse direction, under the action of the restoring force of the spring 36, the limiting plate 31 smoothly withdraws under the action of the inclined surface to realize quick unlocking.

[0056] Specifically, as Figure 1 shown, in the embodiment of the present invention, adjacent two of the annular segment assemblies 1 arranged along the tunnel length direction are spliced in a staggered joint manner, that is, the splicing joints of the annular segment assemblies 1 along the tunnel length direction are not on the same straight line, so as to enhance their load-bearing capacity. Among them, the connection manner between adjacent two annular segment assemblies 1 can be bolt connection, screw connection, rivet connection or welding, etc., or a combination of two or more connection manners, and no limitation is made in this embodiment.

[0057] In the embodiment of the present invention, the arc-shaped plate 11 includes an arc-shaped outer plate, an arc-shaped inner plate and two arc-shaped side plates. The arc-shaped outer plate is used to abut against the inner wall of the tunnel and is respectively connected to the two arc-shaped side plates. The arc-shaped side plates are used to connect two adjacent arc-shaped plates 11. The arc-shaped inner plate is respectively connected to the two arc-shaped side plates. Among them, the arc-shaped outer plate, the arc-shaped inner plate and the two arc-shaped side plates enclose an annular grouting space. A grouting hole communicating with the grouting space is provided on the arc-shaped inner wall, and in order to further improve the structural strength of the arc-shaped plate 11, a plurality of reinforcing ribs are provided in the grouting space.

[0058] Embodiment 2

[0059] A construction method for tunnel support, applicable to the tunnel support structure described in Embodiment 1, includes the following steps:

[0060] Step 1: Transport several precast arc-shaped plates 11 to the tunnel excavation working face. Each arc-shaped plate 11 is preset with a connecting part 111 and a clamping part 112. Subsequently, the arc-shaped plates 11 are sequentially assembled from the lower part to the upper part in the circumferential direction of the tunnel. The connecting part 111 at one end of each arc-shaped plate 11 is inserted and matched with the clamping part 112 of the adjacent installed plate to form an assembled closed ring segment assembly 1. Then, the adjacent ring segment assemblies 1 are assembled in a staggered joint arrangement along the longitudinal direction of the tunnel to prevent the longitudinal joints from aligning and improve the overall shear resistance and bearing performance of the structure.

[0061] Among them, during construction, when sequentially installing multiple arc-shaped plates 11, they can be sequentially spliced in the counterclockwise or clockwise direction to assemble into a segment ring assembly. Of course, in order to shorten the construction period, construction can also be carried out simultaneously from both ends or multiple places to assemble into a ring segment assembly 1. Then, install the target number of ring segment assemblies 1 on the basis of the already constructed ring segment assembly 1 to reach the concrete formwork of the target length, that is, complete the assembly of the support structure framework.

[0062] Step 2: For each arc-shaped plate 11, drive the driving plate 22 and the fixing plate 21 to move horizontally by rotating the adjusting screw 23 to achieve close fit with the side wall of the adjacent clamping part 112. That is, drive the two adjusting screws 23 synchronously through the connecting rod 26 to achieve synchronous limit pressing of the two fixing plates 21, improving the assembly accuracy and installation efficiency. As the fixing plate 21 moves, the driven limit block 24 automatically enters the limit groove 25 provided on the clamping part 112 during the adjustment process to achieve horizontal self-locking positioning and prevent the structure from being misaligned during subsequent concrete pouring or settlement. At the same time, the pushing block 33 pushes the limit plate 31 into the locking groove 32 on the clamping part 112 to achieve vertical limit, thereby realizing two-way limit locking and further enhancing the overall connection stability. When the pushing block 33 moves in the reverse direction, the limit plate 31 can automatically withdraw from the locking groove 32 under the action of the spring 36 to achieve unlocking and resetting for disassembly.

[0063] Step 3: After all the arc-shaped plates 11 of the whole ring are assembled and the limit components are locked in place, inject concrete into the inner side of each arc-shaped plate 11. Among them, the concrete pouring adopts a layered and segmented method to ensure that the concrete fills the inside of the structure to form a solid closed body. After the concrete initial sets to final sets, remove the external temporary support to form an integrated concrete composite segment structure, making it have excellent pressure-bearing, waterproof and durability performance. The concrete can be ordinary concrete or self-compacting concrete, etc., which is not limited in this embodiment.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A tunnel support structure, characterized in that, Comprising: At least one annular segment assembly (1) is provided on the inner wall of the tunnel. The annular segment assembly (1) includes a plurality of arc-shaped plates (11). The arc-shaped plates (11) are sequentially connected along the circumferential direction of the tunnel to form a closed annular segment structure. One end of the arc-shaped plate (11) is provided with a connecting portion (111), and the other end is provided with a clamping portion (112) that is clamped with the connecting portion (111). The first limiting assembly (2) includes two slidable fixing plates (21) provided on the connecting portion (111) and located on both sides of the clamping portion (112), and an adjusting member provided on the connecting portion (111) and connected to the fixing plate (21). Wherein, the adjusting member is used to drive the fixing plate (21) to move laterally so that it fits and connects with the side wall of the clamping portion (112), so as to realize the limiting and fixing between the arc-shaped plates (11).

2. The tunnel support structure according to claim 1, characterized in that, The adjusting member includes: A driving plate (22) is connected to the fixing plate (21). An adjusting screw (23) is rotatably installed on the connecting portion (111). The adjusting screw (23) is threadedly connected to the driving plate (22) and is used to drive the fixing plate (21) to move along its axial direction.

3. A tunnel support structure according to claim 2, characterized in that, A limiting block (24) is provided on the side of the driving plate (22) close to the connecting portion (111). A limiting groove (25) corresponding to the limiting block (24) is opened on the side surface of the clamping portion (112). The limiting block (24) is clamped or separated from the limiting groove (25) under the action of the adjusting screw (23).

4. A tunnel support structure according to claim 2, characterized in that, A connecting rod (26) is also rotatably provided on the connecting portion (111). The two ends of the connecting rod (26) are respectively connected to the two adjusting screws (23) to realize the synchronous adjustment of the movement of the two fixing plates (21).

5. A tunnel support structure according to any one of claims 2-4, characterized in that, A groove is provided on the side wall of the connecting portion (111). One end of the adjusting screw (23) is provided with an adjusting nut (27), and the adjusting nut (27) is embedded in the groove.

6. A tunnel support structure according to claim 3, characterized in that, It further includes a second limiting assembly (3). The second limiting assembly (3) includes: A limiting plate (31). A pushing member is connected to the limiting plate (31). The limiting block (24) is provided with an installation cavity for installing the pushing member. The limiting plate (31) is located in the installation cavity and penetrates through the limiting block (24). The clamping portion (112) is provided with a locking groove (32) corresponding to the limiting plate (31), and the locking groove (32) is perpendicular to the limiting groove (25). Wherein, the pushing member moves along the axial direction of the adjusting screw (23) to drive the limiting plate (31) to be inserted into or separated from the locking groove (32) in the vertical direction.

7. The tunnel support structure according to claim 6, characterized in that, The driving member includes a driving block (33) slidably disposed in the installation cavity along the axial direction of the adjusting screw rod (23); a fixing rod (34) is disposed in the installation cavity, and a reset plate (35) is slidably connected to the side wall of the fixing rod (34). One end of the reset plate (35) is connected to the limiting plate (31). A spring (36) is sleeved outside the fixing rod (34), and two ends of the spring (36) are respectively connected to the reset plate (35) and the inner wall of the installation cavity. The driving block (33) abuts against the limiting plate (31).

8. A tunnel support structure according to claim 7, characterized in that, The limiting plate (31) is of a wedge-shaped structure, and its inclined surface is slidably matched with the driving block (33) to form an inclined self-locking fit.

9. A tunnel support structure according to any one of claims 1-8, characterized in that, Adjacent two of the annular segment assemblies (1) arranged along the tunnel length direction are spliced in a staggered joint manner.

10. A construction method for tunnel support, comprising the tunnel support structure according to any one of claims 1-9, characterized in that, It includes the following steps: Step 1: Splice a plurality of the arc-shaped plates (11) in sequence along the tunnel circumference, and assemble the plurality of arc-shaped plates (11) one by one from bottom to top to assemble the annular segment assembly (1); Step 2: Inject concrete into the arc-shaped plate (11), and after the concrete hardens and forms, an integrated concrete combined segment structure is formed.

Images