Spliced tunnel segment with sliding groove

Abstract

The application discloses spliced tunnel segment prefabricated component with sliding chute, relates to the technical field of tunnel segment prefabricated component, and comprises an arc-shaped plate, the two ends of the arc-shaped plate are fixedly provided with connecting pieces, the two sides of the arc-shaped plate are provided with inclined surfaces, and the inclined surfaces are matched with the bottom inclined surfaces of the connecting pieces. Through the cooperative matching of the self-locking assembly, the positioning groove and the rectangular groove, the synchronous positioning and locking of the adjacent arc-shaped plates in the axial direction, the radial direction and the tangential direction are realized, when being installed, only the two segments need to be close to each other, the locking plate is automatically reset under the action of gravity and forms one-way self-locking with the tooth groove and the frame plate convex teeth, the effect of 'installation self-locking' is achieved, additional fastening operation is not needed, and the assembling efficiency is greatly improved; meanwhile, the self-locking structure is more tightly engaged when bearing axial tension in tunnel operation, the segment misalignment and loosening are effectively prevented, and the long-term reliability of the lining circumferential connection is remarkably improved.

Description

Technical Field

[0001] This invention relates to the technical field of prefabricated tunnel segment components, particularly spliced ​​prefabricated tunnel segment components with grooves. Background Technology

[0002] Precast tunnel segments are the core load-bearing units of shield tunnel lining, and their assembly and connection quality is directly related to the safety and durability of the tunnel structure.

[0003] Currently, conventional tunnel segments are mainly connected by bolts or tongue and groove joints. Bolt connections require manual insertion and tightening of bolts after segment assembly, which is inefficient due to limited operating space and cumbersome procedures. Furthermore, bolts are prone to loosening under long-term vibration and surrounding rock pressure, leading to misalignment and leakage between segments. While tongue and groove joints offer faster assembly, they only provide limited positioning and lack a reliable locking mechanism. Their shear and tensile strengths are also insufficient, making it difficult to meet the requirements of harsh working conditions such as high water pressure and deep burial. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or existing spliced ​​grooved tunnel segment prefabricated components, the present invention is proposed.

[0006] Therefore, the problem to be solved by this invention is how to solve the problems of bolted connections, which have narrow operating space, complicated procedures, and low assembly efficiency. Although mortise and tenon connections are faster to assemble, they lack a reliable locking mechanism and have insufficient shear and tensile strength, making it difficult to meet the requirements of harsh working conditions such as high water pressure and deep burial.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a splicing precast tunnel segment component with grooves, comprising an arc-shaped plate with connectors fixedly installed at both ends. The two sides of the arc-shaped plate are inclined and cooperate with the bottom inclined surface of the connector. An elastic hoisting component is provided on the inner arc surface of the arc-shaped plate. Positioning grooves are provided on both sides of the arc-shaped plate. A self-locking component is provided inside one of the positioning grooves. A rectangular groove is provided at the end of the connector. The rectangular groove cooperates with the outer shell of the self-locking component. During splicing, the positioning grooves and rectangular grooves at corresponding positions of the four arc-shaped plates correspond to the self-locking component to lock the arc-shaped plates together.

[0008] As a preferred embodiment of the spliced ​​grooved tunnel segment prefabricated component of the present invention, the self-locking component includes an installation shell fixedly connected to the positioning groove, a rotating shaft is provided inside the installation shell, a locking plate is rotatably provided on the outer periphery of the rotating shaft, and several toothed grooves are provided on both sides of the locking plate.

[0009] As a preferred embodiment of the spliced ​​grooved tunnel segment prefabricated component of the present invention, the rectangular groove is provided with a frame plate inside, and the two side frame plates are located above and below the rotating shaft, respectively.

[0010] As a preferred embodiment of the spliced ​​grooved tunnel segment prefabricated component of the present invention, wherein: the outer arc surface of the arc plate is provided with an embedded groove.

[0011] As a preferred embodiment of the spliced ​​grooved tunnel segment prefabricated component of the present invention, wherein: the connector is provided with a rotating cavity inside, and a locking bolt is rotatably provided inside the rotating cavity.

[0012] As a preferred embodiment of the spliced ​​grooved tunnel segment prefabricated component of the present invention, wherein: a sliding cavity is provided at the position corresponding to the connecting member of the arc plate, and a bolt sleeve is slidably arranged inside the sliding cavity.

[0013] As a preferred embodiment of the spliced ​​grooved tunnel segment prefabricated component of the present invention, wherein: the arc-shaped plate is provided with a steel reinforcement skeleton inside.

[0014] As a preferred embodiment of the spliced ​​grooved tunnel segment prefabricated component of the present invention, the elastic hoisting assembly includes a through groove opened on the inner side of the arc plate, a short rib is provided inside the through groove, a spring is provided at one end of the short rib to push one end of the short rib out of the groove opening, a conical platform is vertically inserted inside the through groove, and a hook ring is fixedly provided at the top of the conical platform.

[0015] As a preferred embodiment of the splicing type precast tunnel segment component with sliding groove described in this invention, the splicing inclined surface of the connector is provided with a sliding groove, the interior of the sliding groove is provided with a metal guide rail, and the metal guide rail cooperates with the short rib.

[0016] As a preferred embodiment of the spliced ​​grooved tunnel segment prefabricated component of the present invention, wherein: the metal guide rail is provided with a positioning end inside, and one end of the short rib is provided with a part that can be inserted into the positioning end.

[0017] The beneficial effects of this invention are: 1. This invention achieves synchronous positioning and locking of adjacent arc-shaped plates in the axial, radial, and tangential directions through the coordinated cooperation of the self-locking component, positioning groove, and rectangular groove. During installation, simply bring the two segments close together, and the locking plate automatically resets under gravity and forms a one-way self-lock with its toothed groove and the convex teeth of the frame plate, achieving the effect of "self-locking upon installation". No additional tightening operation is required, which greatly improves the assembly efficiency. At the same time, the self-locking structure bites tighter when subjected to axial tension during tunnel operation, effectively preventing segment misalignment and loosening, and significantly improving the long-term reliability of the circumferential connection of the lining.

[0018] 2. During hoisting, the conical platform is subjected to force and moves upward, pushing the short ribs to bend. After positioning, the short ribs automatically spring into the guide rail positioning end to form a preliminary circumferential positioning, providing a benchmark for precise docking of the self-locking components. Subsequently, rotating the locking bolt drives the bolt sleeve to press the end face of the connector, eliminating the assembly gap and providing pre-tightening force, so that the connection node changes from rigid contact to pre-tightened connection, which greatly improves fatigue resistance and vibration resistance. In addition, the embedded groove on the outer arc surface of the arc plate forms a concrete anchor key after grouting, which increases the shear bearing capacity and waterproof sealing path, comprehensively enhancing the overall stability and durability of the segments under complex surrounding rock conditions. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a scene illustration of prefabricated components for spliced ​​tunnel segments with grooves.

[0021] Figure 2 This is a structural diagram of a prefabricated segment component for spliced ​​tunnel sections with grooves.

[0022] Figure 3 This is a structural diagram of a self-locking assembly for a spliced ​​precast tunnel segment with grooves.

[0023] Figure 4 This is a structural diagram of an elastic hoisting assembly for prefabricated tunnel segments with splicing grooves.

[0024] Figure 5 This is a working plan view of the self-locking assembly of a spliced ​​precast tunnel segment with groove.

[0025] In the diagram: 1. Arc plate; 11. Embedded groove; 12. Sliding cavity; 13. Bolt sleeve; 2. Connector; 21. Rectangular groove; 22. Frame plate; 23. Rotating cavity; 24. Locking bolt; 25. Sliding groove; 26. Metal guide rail; 27. Positioning end; 3. Elastic hoisting assembly; 31. Through groove; 32. Short rib; 33. Conical platform; 34. Hook; 4. Positioning groove; 5. Self-locking assembly; 51. Mounting housing; 52. Rotating shaft; 53. Locking plate; 54. Gear. Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0029] Example 1, referring to Figures 1-5This is the first embodiment of the present invention, which provides a prefabricated component for spliced ​​tunnel segments with grooves. The prefabricated component includes an arc-shaped plate 1, connectors 2 fixedly disposed at both ends of the arc-shaped plate 1, an elastic hoisting assembly 3 disposed on the inner arc surface of the arc-shaped plate 1, positioning grooves 4 opened on both sides of the arc-shaped plate 1, and a self-locking assembly 5 disposed within the positioning grooves 4. The connectors 2 have a rectangular groove 21 at their ends that matches the outline of the self-locking assembly 5's outer shell. The self-locking assembly 5 includes a mounting shell 51, a rotating shaft 52, a locking plate 53 rotatable around the rotating shaft 52, and toothed grooves 54 on both sides. A frame plate 22 is fixed within the rectangular groove 21. During splicing, the frame plate 22... The locking plate 53 is pushed to rotate and avoid, and after it is in place, the locking plate 53 is reset and its toothed groove 54 engages with the protruding teeth of the frame plate 22 to form a one-way lock; the connecting piece 2 is provided with a rotating cavity 23 and a locking bolt 24, and the arc plate 1 is provided with a sliding cavity 12 and a bolt sleeve 13 inside it to provide pre-tightening force; the splicing inclined surface of the connecting piece 2 is provided with a sliding groove 25 and a metal guide rail 26 inside it, and the end of the metal guide rail 26 is provided with a positioning end 27; the elastic hoisting component 3 includes a through groove 31, a short rib 32, a conical platform 33 and a hook ring 34. After hoisting, the short rib 32 automatically springs into the positioning end 27 to achieve circumferential auxiliary positioning; the outer arc surface of the arc plate 1 is also provided with an embedding groove 11.

[0030] Specifically, the arc-shaped plate 1 serves as the main load-bearing structure of the tunnel lining, and connectors 2 are fixedly installed at both ends of it. The connectors 2 and the arc-shaped plate 1 are prefabricated as an integral component.

[0031] The two sides of the arc plate 1 are set with slopes, which cooperate with the bottom slope of the connector 2. When the two slopes are spliced ​​together, they form a contact surface that fits each other. This slope fit structure can convert the radial load into the tangential component force when the pipe segment is subjected to the surrounding rock pressure, thereby enhancing the circumferential locking effect and effectively preventing misalignment between adjacent pipe segments.

[0032] The inner arc surface of the arc plate 1 is provided with an elastic lifting component 3. The elastic lifting component 3 is used to provide a reliable hanging point for the lifting equipment during the prefabrication, transportation and on-site assembly of the segments. During the lifting, the elastic lifting component 3 can be pulled into the through groove 31 by the pulling force on the elastic lifting component 3. After the installation and positioning, the lifting is cancelled. At this time, the short rib 32 automatically springs into the metal guide rail 26 to achieve the purpose of fixing multiple arc plates 1.

[0033] Specifically, positioning grooves 4 are provided on both sides of the arc plate 1. The positioning grooves 4 are concave groove structures, and their positions correspond to the ends of the connectors 2. When adjacent arc plates 1 are spliced, the positioning grooves 4 on both sides are aligned axially to form a complete accommodating space.

[0034] One of the positioning slots 4 is equipped with a self-locking component 5, which is fixedly installed in the positioning slot 4 of the arc plate 1 on that side as an active locking unit. The positioning slot 4 of the other arc plate 1 is used to accommodate the protruding part of the self-locking component 5, forming a passive engagement structure.

[0035] The working principle of the self-locking component 5 is as follows: when two adjacent arc plates 1 approach each other along the axial direction, the locking component of the self-locking component 5 automatically rotates under the action of contact pressure. After the two arc plates 1 are fully in place, the locking plate 53 is located between the two frame plates 22 and is clamped to achieve the purpose of fixing the arc plates 1.

[0036] Specifically, the end of the connector 2 is provided with a rectangular groove 21. The rectangular groove 21 is a square through groove 31 that penetrates the wall thickness of the end of the connector 2. The size of the groove is matched with the outer shell outline of the self-locking component 5.

[0037] The rectangular groove 21 and the outer shell of the self-locking component 5 cooperate with each other. During the splicing process, the outer shell of the self-locking component 5 can be precisely embedded inside the rectangular groove 21. The two adopt a gap fit method to ensure that the self-locking component 5 can be smoothly inserted. At the same time, the four inner walls of the rectangular groove 21 form a circumferential limit on the outer shell of the self-locking component 5 to prevent the self-locking component 5 from rotating or shifting during tunnel operation.

[0038] Specifically, during splicing, the arc-shaped plates 1 are arranged sequentially along the tunnel circumference, and adjacent arc-shaped plates 1 are fitted together by the inclined surfaces of the connectors 2.

[0039] The positioning grooves 4 and rectangular grooves 21 of the four arc-shaped plates 1 correspond to the self-locking components 5. That is, when two adjacent arc-shaped plates 1 are spliced ​​together, the self-locking components 5 in the positioning groove 4 of one arc-shaped plate 1 pass through the rectangular grooves 21 on the connector 2 of the arc-shaped plate 1 and the rectangular grooves 21 on the connector 2 of the other arc-shaped plate 1, and finally extend into the positioning groove 4 of the other arc-shaped plate 1.

[0040] The self-locking assembly 5 is used to lock the arc plates 1 together. The locking mechanism of the self-locking assembly 5 firmly fixes the two adjacent arc plates 1 in the axial direction. At the same time, the cooperation between the positioning groove 4 and the rectangular groove 21 constrains the self-locking assembly 5 in the radial and tangential directions, thereby realizing the full positioning and locking of the arc plates 1 in three directions, achieving the effect of self-locking upon installation.

[0041] Example 2, refer to Figures 1-5 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0042] Specifically, the self-locking component 5 includes a mounting housing 51 fixedly connected to the positioning groove 4. The mounting housing 51 is fixedly installed at the bottom of the positioning groove 4 by pre-embedded bolts. A rotating shaft 52 is provided inside the mounting housing 51, and the two ends of the rotating shaft 52 are fixedly connected to the inner walls of the two sides of the mounting housing 51, respectively.

[0043] A locking plate 53 is rotatably mounted on the outer periphery of the rotating shaft 52. The locking plate 53 is fitted onto the rotating shaft 52 and can rotate freely around the rotating shaft 52. In its natural state, the locking plate 53 remains vertically hanging due to gravity. Both sides of the locking plate 53 are provided with several toothed grooves 54. The toothed grooves 54 are serrated grooves arranged at equal intervals, and their openings face the direction of rotation of the locking plate 53.

[0044] The working principle of the self-locking component 5 is as follows: when two adjacent arc-shaped plates 1 approach each other, the opposite side frame plate 22 first contacts the top of the locking plate 53 and pushes the locking plate 53 to rotate around the rotating shaft 52, so that the locking plate 53 deflects into the mounting housing 51 to avoid it.

[0045] Once the two arc-shaped plates 1 are fully in place, the groove wall of the opposite rectangular groove 21 is inserted into the interior of the mounting housing 51, and the two sides of the locking plate 53 are close to the upper and lower surfaces of the two frame plates 22 respectively, achieving preliminary axial positioning. Under the action of gravity, the locking plate 53 automatically rotates in the opposite direction to reset, and the toothed grooves 54 on both sides are respectively engaged in the corresponding convex tooth structure of the opposite frame plate 22, forming a one-way locking. That is, under the action of axial tension, the toothed grooves 54 and the convex teeth of the two arc-shaped plates 1 bite each other to produce a self-locking effect. The greater the tension, the tighter the bite, thereby effectively preventing the arc-shaped plates 1 from axially loosening during tunnel operation.

[0046] Specifically, a frame plate 22 is provided inside the rectangular groove 21, and the two side frame plates 22 are located above and below the rotating shaft 52, respectively. The frame plate 22 is a rectangular ring-shaped metal frame structure, and its outer edge is fixedly connected to the inner wall of the rectangular groove 21 by welding. The inner frame surface of the frame plate 22 forms a sliding guide fit with the outer wall of the mounting shell 51.

[0047] The frame plate 22 plays a dual role in the process of inserting the self-locking assembly 5 into the rectangular slot 21: First, when two adjacent arc plates 1 come close to each other, the frame plate 22 on the opposite side connector 2 first contacts the top inclined surface of the locking plate 53, pushing the locking plate 53 to rotate around the pivot 52 into the mounting housing 51 to avoid it, ensuring that the mounting housing 51 can pass smoothly through the rectangular slot 21.

[0048] Secondly, after the housing 51 is fully inserted into the rectangular groove 21, the two frame plates 22 are located above and below the locking plate 53 respectively, forming an upper and lower clamping space for the locking plate 53. The height of the clamping space is equal to the thickness of the locking plate 53, so that after the locking plate 53 is reset, its upper and lower surfaces are tightly fitted with the inner surfaces of the two frame plates 22 respectively, thereby achieving the initial positioning of the adjacent arc-shaped plates 1 in the axial direction.

[0049] The inner edge of the frame plate 22 is also provided with a tooth structure corresponding to the tooth groove 54. When the locking plate 53 is reset, the tooth is just inserted into the tooth groove 54 to form a one-way locking fit. At the same time, the frame plate 22, as a metal reinforcement, significantly improves the structural rigidity of the opening of the rectangular groove 21, preventing the end of the connector 2 from cracking or deforming when subjected to the surrounding rock pressure for a long time.

[0050] Specifically, the outer arc surface of the arc plate 1 is provided with an embedding groove 11. The embedding groove 11 is a trapezoidal cross-section strip groove extending axially along the outer arc surface of the arc plate 1, and its bottom contacts and is welded to the outermost layer of the steel reinforcement skeleton inside the arc plate 1.

[0051] After the segment assembly is completed, the embedded groove 11 forms a closed cavity area between itself and the surrounding rock. When grouting is carried out behind the tunnel, the grout fills the inside of the embedded groove 11 under pressure. After the grout solidifies, it forms a concrete anchor key embedded in the outer arc surface of the arc plate 1. This anchor key effectively increases the bonding area and shear bearing capacity between the arc plate 1 and the surrounding rock, preventing the overall slippage of the segment due to loosening of the surrounding rock or scouring by groundwater during tunnel operation.

[0052] Meanwhile, water-swellable rubber sealing strips are pre-placed inside the embedded groove 11 during assembly. After the sealing strips are pressed in the embedded groove 11, they can form a complete waterproof sealing ring along the circumferential and longitudinal directions of the arc plate 1. When groundwater seeps in from the surrounding rock, it must pass through multiple contact surfaces between the sealing strips and the groove wall of the embedded groove 11 in sequence, thereby greatly improving the waterproof performance of the tunnel lining.

[0053] Specifically, the connector 2 has a rotating cavity 23 inside, and a locking bolt 24 is rotatably mounted inside the rotating cavity 23. The rotating cavity 23 is a circular cavity structure opened inside the connector 2, and its cavity diameter is larger than the outer diameter of the head of the locking bolt 24, ensuring that the head of the locking bolt 24 can rotate freely inside the rotating cavity 23 without getting stuck.

[0054] One end of the rotating cavity 23 is provided with a through hole that matches the diameter of the locking bolt 24. The through hole passes through the end face of the connector 2 and extends toward the sliding cavity 12 of the arc plate 1. The bolt part of the locking bolt 24 extends out from the through hole and is inserted into the bolt sleeve 13. After the self-locking assembly 5 completes the initial self-locking, the operator uses a special wrench to insert into the rotating cavity 23 through the operation hole reserved on the side of the connector 2 and rotates the head of the locking bolt 24. When the locking bolt 24 rotates, its external thread engages with the internal thread of the bolt sleeve 13.

[0055] The locking bolt 24 is designed to be tightened clockwise. As the locking bolt 24 is tightened, the bolt sleeve 13 moves along the sliding cavity 12 toward the connector 2, and its end gradually presses against the end face of the connector 2, increasing the contact pressure between the connector 2 and the arc plate 1. This clamping force can eliminate the assembly gap caused by prefabrication error, and change the connection node of the two adjacent arc plates 1 from rigid contact to pre-compression connection, which significantly improves the fatigue resistance and vibration resistance of the connection node.

[0056] Specifically, a sliding cavity 12 is provided at the position corresponding to the connecting piece 2 of the arc plate 1, and a bolt sleeve 13 is slidably arranged inside the sliding cavity 12.

[0057] The sliding cavity 12 is a cylindrical stepped hole structure opened along the thickness direction of the arc plate 1. The bolt sleeve 13 can slide stably in the sliding cavity 12. The bolt sleeve 13 is a cylindrical sleeve structure with a smooth outer wall and a threaded inner wall. Its outer diameter slides with the large diameter section of the sliding cavity 12, so that the bolt sleeve 13 can slide freely in the sliding cavity 12 without generating radial swing.

[0058] The bolt sleeve 13 has an annular end face near the connector 2. This annular end face contacts the end face of the connector 2 and transmits the clamping force under the drive of the locking bolt 24.

[0059] The other end of the bolt sleeve 13 is provided with a limiting flange, which cooperates with the stepped surface in the sliding cavity 12 to prevent the bolt sleeve 13 from coming out of the sliding cavity 12. In the actual installation process, the bolt sleeve 13 is pre-embedded in the sliding cavity 12 when the arc plate 1 is prefabricated. After the self-locking assembly 5 is locked, the operator rotates the locking bolt 24. The bolt sleeve 13 moves axially along the sliding cavity 12 under the action of thread transmission to eliminate the assembly gap and provide sufficient preload. At the same time, after the bolt sleeve 13 is tightened, it forms a self-locking thread pair with the locking bolt 24. Even if vibration occurs during tunnel operation, the thread pair will remain locked by its own friction and will not automatically loosen.

[0060] Specifically, the arc-shaped plate 1 is internally equipped with a reinforcing steel skeleton, which is a three-dimensional spatial grid structure composed of circumferential main bars, longitudinal distribution bars, and stirrups bound and welded together. The reinforcing steel skeleton is placed inside the mold during the prefabrication of the arc-shaped plate 1, and each intersection node is fixed by binding or spot welding to ensure that the reinforcing steel skeleton does not shift or deform during concrete pouring. Both ends of the reinforcing steel skeleton extend into the interior of the connector 2 and are welded to the pre-embedded steel plate of the connector 2, forming a continuous force transmission path between the arc-shaped plate 1 and the connector 2. When the arc-shaped plate 1 is subjected to surrounding rock pressure, the reinforcing steel skeleton bears all the tensile stress and most of the shear stress, while the concrete bears the compressive stress. The combined effect of these two elements effectively improves the ultimate bearing capacity and crack resistance of the arc-shaped plate 1.

[0061] Specifically, the elastic hoisting assembly 3 includes a through groove 31 opened on the inner side of the arc plate 1, a short rib 32 is provided inside the through groove 31, a conical platform 33 is vertically inserted inside the through groove 31, and a hook ring 34 is fixedly provided at the top of the conical platform 33.

[0062] The through-slot 31 is a conical through-hole structure that penetrates the wall thickness of the arc-shaped plate 1. Its upper diameter is larger than its lower diameter, and the taper of the through-slot 31 is consistent with the taper of the outer conical surface of the conical platform 33. The short reinforcing bars 32 are arranged circumferentially along the arc-shaped plate 1. The two ends of the short reinforcing bars 32 are anchored in the concrete on both sides of the through-slot 31, and the middle section of the short reinforcing bars 32 passes through the interior of the through-slot 31 and is located below the conical platform 33.

[0063] The conical platform 33 is a solid steel frustum structure. Its outer conical surface fits into the inner conical surface of the through groove 31. The bottom diameter of the conical platform 33 is larger than the lower end diameter of the through groove 31, ensuring that the conical platform 33 will not come out from the lower end of the through groove 31.

[0064] The hook 34 is welded and fixed to the center of the top of the conical platform 33, and is used to connect the shackle of the hoisting wire rope. During the hoisting operation, the hoisting equipment pulls the hook 34 upward through the wire rope. Under the action of the tension, the conical platform 33 slides upward along the through groove 31. A wedging friction is generated between the outer conical surface of the conical platform 33 and the inner conical surface of the through groove 31. This friction increases linearly with the increase of the hoisting weight, ensuring that the conical platform 33 will not suddenly slip during the hoisting process.

[0065] Meanwhile, the bottom of the conical platform 33 contacts and pushes the short rib 32 during the upward process, causing the short rib 32 to undergo elastic bending deformation within the through groove 31. When the arc plate 1 is hoisted to the design position and the hoisting tension is released, the conical platform 33, under the action of gravity or the release of the elastic element on the back side of the short rib 32, automatically ejects the short rib 32 along the through groove 31. The middle section of the short rib 32 ejects from the through groove 31 and extends circumferentially, automatically springing into the positioning end 27 of the metal guide rail 26 on the adjacent connecting piece 2, locking the two adjacent arc plates 1 in the circumferential direction.

[0066] Specifically, the splicing slope of the connector 2 is provided with a sliding groove 25, and a metal guide rail 26 is provided inside the sliding groove 25. The metal guide rail 26 cooperates with the short rib 32. The sliding groove 25 is a groove extending longitudinally along the splicing slope of the connector 2. The metal guide rail 26 is fixedly connected to the connector 2 by countersunk screws. A guide slide is provided inside the metal guide rail 26. The width of the guide slide is equal to the diameter of the short rib 32. When adjacent arc plates 1 approach each other, the end of the short rib 32 slides into the guide slide from the starting end of the metal guide rail 26 and slides forward along the guide slide until the end position.

[0067] Specifically, the metal guide rail 26 has a positioning end 27 inside. One end of the short rib 32 is provided with a recess that can be inserted into the positioning end 27. The positioning end 27 is a circular positioning recess located at the end of the guide slide of the metal guide rail 26. The end of the short rib 32 near the metal guide rail 26 is machined into a hemispherical end, the diameter of which is equal to the diameter of the positioning end 27. When the short rib 32 slides along the guide slide of the metal guide rail 26 to the end position, the hemispherical end of the short rib 32 automatically falls into the circular recess of the positioning end 27 under the action of its own elastic restoring force. The fit between the hemispherical end and the circular recess produces a clear tactile feel, and the operator can accurately judge that the splicing is in place by the change in feel and the crisp metallic impact sound. The circular recess of the positioning end 27 forms radial and tangential limits on the hemispherical end of the short rib 32, preventing relative displacement between the two adjacent arc plates 1 in the circumferential direction. The mating structure between the positioning end 27 and the hemispherical end of the short rib 32 serves as a second auxiliary positioning mechanism in addition to the self-locking assembly 5 and the locking bolt 24. During assembly, it first completes the initial positioning, providing a positional reference for the subsequent precise docking of the self-locking assembly 5 and the accurate alignment of the locking bolt 24. The three positioning and locking mechanisms work together to ensure the safety and durability of the circumferential connection of the tunnel segments.

[0068] In use, the arc-shaped plates 1 are hoisted into position sequentially along the tunnel circumference. During hoisting, the conical platform 33 is lifted by the hook ring 34, causing it to slide up along the through groove 31 and push the short rib 32 to compress the spring. After the tunnel segment is lowered to the design position and the hoisting force is released, the short rib 32 automatically springs into the positioning end 27 of the metal guide rail 26 of the adjacent connector 2, completing the initial circumferential positioning. Subsequently, the adjacent arc-shaped plates 1 move closer to each other along the axial direction, and the opposite frame plate 22 pushes the locking plate 53 to rotate around the pivot 52 to avoid it. After it is fully in place, the locking plate 53 resets under the action of gravity, and its toothed groove 54 engages with the convex teeth of the frame plate 22 to form a one-way self-locking, realizing locking upon installation. Finally, the locking bolt 24 is rotated with a special wrench, driving the bolt sleeve 13 to move along the sliding cavity 12 and press against the end face of the connector 2, eliminating the assembly gap and providing pre-tightening force, completing the entire splicing.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A spliced ​​precast tunnel segment component with grooves, characterized in that: include, The arc plate (1) has connectors (2) fixedly installed at both ends. The two sides of the arc plate (1) are set with slopes and cooperate with the bottom slope of the connectors (2). The inner arc surface of the arc plate (1) is provided with an elastic hoisting component (3). The curved plate (1) has positioning grooves (4) on both sides, and a self-locking component (5) is installed inside one of the positioning grooves (4). The end of the connector (2) is provided with a rectangular groove (21), which cooperates with the outer shell of the self-locking component (5). During splicing, the positioning grooves (4) and rectangular grooves (21) of the four arc-shaped plates (1) correspond to the self-locking components (5) and are used to lock the arc-shaped plates (1) together.

2. The spliced ​​precast tunnel segment component with groove as described in claim 1, characterized in that: The self-locking assembly (5) includes a mounting housing (51) fixedly connected to the positioning groove (4). A rotating shaft (52) is provided inside the mounting housing (51). A locking plate (53) is rotatably provided on the outer periphery of the rotating shaft (52). Several toothed grooves (54) are provided on both sides of the locking plate (53).

3. The spliced ​​precast tunnel segment component with groove as described in claim 2, characterized in that: The rectangular groove (21) is provided with a frame plate (22) inside, and the two side frame plates (22) are located above and below the rotating shaft (52) respectively.

4. The spliced ​​precast tunnel segment component with groove as described in any one of claims 1, 2, or 3, characterized in that: The outer arc surface of the arc plate (1) is provided with an embedded groove (11).

5. The spliced ​​precast tunnel segment component with groove as described in any one of claims 1, 2, or 3, characterized in that: The connector (2) has a rotating cavity (23) inside, and a locking bolt (24) is rotatably installed inside the rotating cavity (23).

6. The spliced ​​precast tunnel segment component with groove as described in claim 1, characterized in that: The arc plate (1) is provided with a sliding cavity (12) at the position corresponding to the connector (2), and a bolt sleeve (13) is slidably provided inside the sliding cavity (12).

7. The spliced ​​precast tunnel segment component with groove as described in claim 1, characterized in that: The arc-shaped plate (1) is provided with a steel reinforcement frame inside.

8. The spliced ​​precast tunnel segment component with groove as described in claim 1, characterized in that: The elastic hoisting assembly (3) includes a through groove (31) opened on the inner side of the arc plate (1). A short rib (32) is provided inside the through groove (31). A spring is provided at one end of the short rib (32) to push one end of the short rib (32) out of the slot of the through groove (31). A conical platform (33) is vertically inserted inside the through groove (31). A hook ring (34) is fixedly provided at the top of the conical platform (33).

9. The spliced ​​precast tunnel segment component with groove as described in claim 1, characterized in that: The connector (2) has a sliding groove (25) on its splicing slope. A metal guide rail (26) is provided inside the sliding groove (25), and the metal guide rail (26) cooperates with the short rib (32).

10. The spliced ​​precast tunnel segment component with groove as described in claim 9, characterized in that: The metal guide rail (26) has a positioning end (27) inside, and one end of the short rib (32) is provided with a way to be inserted into the positioning end (27).

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