A prefabricated segment for a shield tunnel

Abstract

The application relates to a prefabricated segment for a shield tunnel and relates to the technical field of shield segment technology, which comprises a shield segment, the anti-deviation fixing mechanism comprises a positioning connecting block, the outer side of the positioning connecting block is slidably connected to the inner side of the shield segment, the left and right sides of the outer side of the positioning connecting block are fixedly connected with sealing side edges, and the inner side of the connecting positioning shaft is fixedly connected with a sealing top plate. The application has the effects that the shield segment is connected through multiple positioning connecting blocks, the connecting positioning shaft serves as the interval between multiple shield segments, the design of the I-shaped positioning connecting block enables the positioning connecting block to be closely combined with the two sides of the shield segment, the clamping blocks arranged on the left and right sides of the positioning connecting block are matched with the clamping grooves arranged on the left and right sides of the shield segment, the stability of the shield segment connection is ensured, and the shield segment cannot appear the installation difficulty.

Description

Technical Field

[0001] This application relates to the field of shield tunnel segment technology, and in particular to a prefabricated segment for shield tunnels. Background Technology

[0002] Shield tunnel segment technology refers to the technology of using precast concrete segments to connect and support the tunnel walls in shield tunnel construction. It involves the design, manufacturing, transportation, and assembly of the segments, ensuring that they can be precisely joined together and withstand various pressures and mechanical forces during tunnel construction. Precast tunnel segments are standardized, precast concrete structures specifically produced for shield tunnel construction. They typically consist of multiple segments, precisely assembled to form the structural components of the tunnel. The relationship between shield tunnel segment technology and precast segments is that shield tunnel segment technology, through precise design, prefabrication, and assembly, enables these segments to be successfully assembled into a complete tunnel structure, ensuring efficient and stable construction and meeting the tunnel's operational requirements. In summary, shield tunnel segment technology and precast segments are closely related; the former provides the technical support for the production and assembly of the latter, jointly promoting the smooth construction and stability of shield tunnels. A search revealed Chinese Patent Publication No. CN220929418U, which discloses a waterproof structure for prefabricated shield tunnel segments. The structure includes shield tunnel segments, a waterproof mechanism on the right side of each segment, and a connecting mechanism on the back. When a T-block is fixed to the outside of the shield tunnel segment, the T-block causes a sliding column to move downwards, which in turn moves a rack downwards, causing a gear to rotate. This gear then rotates a half-gear, which, through a connecting frame, rotates a cover to cover a sealing gasket, preventing water erosion that could lead to gasket aging and reduced waterproofing. By placing the shield tunnel segments between a first fixing plate and a second fixing plate, and tightening the nuts, the first and second fixing plates are clamped together, securing multiple shield tunnel segments for greater stability. Additionally, sealing strips are provided on the inner sides of the first and second fixing plates, further enhancing the waterproofing effect. In existing technologies, some precast tunnel segments in shield tunnels do indeed exhibit displacement during prolonged use. Due to the complex construction environment of shield tunnels, factors such as segment splicing, positional calibration, and external pressure during construction can lead to insufficient stability in the connections between segments. Over time, this displacement can occur, affecting the safety and stability of the tunnel structure. Current solutions typically address this issue by installing anti-displacement devices or implementing reinforcement measures. However, these methods often increase construction difficulty and installation complexity, while also extending the construction period and increasing costs. Utility Model Content

[0003] The purpose of this application is to provide a precast segment for shield tunnels, which aims to improve the problem that precast segments in some shield tunnels tend to shift during long-term use, and that solving this problem increases installation difficulties.

[0004] The technical solution provided in this application for a precast segment for a shield tunnel is as follows: a precast segment for a shield tunnel includes multiple shield segments, an anti-deviation fixing mechanism is fixedly connected between the multiple shield segments, an auxiliary fixing mechanism is fixedly connected to the inner side of the shield segments, and a connecting positioning shaft is fixedly connected to the upper and lower sides of the shield segments. The anti-deviation fixing mechanism includes a positioning connecting block, the outer side of which is slidably connected to the inner side of the shield tunnel segment, sealing sides are fixedly connected to the left and right sides of the outer side of the positioning connecting block, a sealing top plate is fixedly connected to the inner side of the connecting positioning shaft, the outer side of the sealing side and the adjacent side of the sealing top plate are in contact with the shield tunnel segment, and a support assembly is fixedly connected to the inner side of the shield tunnel segment.

[0005] Through the above scheme: the precast tunnel segments can be prevented from shifting by the anti-shift fixing mechanism, ensuring connection stability; the sealing side and sealing top plate enhance the sealing performance; the auxiliary fixing mechanism and the connecting positioning shaft strengthen the overall fixation; the support components improve the structural strength, thus improving the overall connection reliability and structural stability of the shield tunnel segments.

[0006] As a further description of the above technical solution: the auxiliary fixing mechanism includes a support block, the support block is externally fixedly connected to the center of the inner side of the shield tunnel segment, multiple supporting triangular plates are fixedly connected to the left and right sides of the support block, a longitudinal beam is fixedly connected to the support block, and a crossbeam is fixedly connected to the inner side of the positioning connecting block.

[0007] The above scheme provides core support in the auxiliary fixing mechanism, while the two side support triangular plates enhance lateral support by leveraging the stability of triangles. The longitudinal beams and transverse beams form a frame structure, which synergistically improves the overall rigidity and support stability of the inner side of the shield tunnel segments and further strengthens the connection between the segments.

[0008] As a further description of the above technical solution: the support component includes transverse steel bars, the external of which is fixedly connected to the inside of the shield tunnel segment, and the internal of the shield tunnel segment is fixedly connected to longitudinal steel bars, the external of which is fixedly connected to the inside of the transverse steel bars.

[0009] Through the above scheme, the transverse and longitudinal steel bars in the support components are fixed to each other, forming a crisscrossing reinforcement structure inside the tunnel segment. This effectively enhances the overall structural strength and deformation resistance of the segment, improves its load-bearing capacity, and further ensures the structural stability of the segment.

[0010] As a further description of the above technical solution: the connecting positioning shaft has a positioning mounting groove inside, the shield tunnel segment is slidably connected to the inside of the positioning mounting groove, and the sealing top plate is slidably connected to the inside of the positioning mounting groove.

[0011] The above solution provides a positioning reference for the shield tunnel segments and the sealing top plate, ensuring accurate connection between the two. The sliding connection design facilitates assembly and allows the sealing top plate and the tunnel segment to fit tightly in the groove, enhancing connection stability and sealing, and improving the overall assembly reliability of the structure.

[0012] As a further description of the above technical solution: the positioning connecting block adopts an I-shaped design, and the center of the positioning connecting block is provided with snap-fit ​​blocks on the left and right sides. The shield tunnel segment is provided with snap-fit ​​grooves on the left and right sides, and the outside of the snap-fit ​​block is slidably connected to the inside of the snap-fit ​​groove.

[0013] The above solution involves an I-shaped positioning connection block that enhances its structural strength and resistance to deformation. The locking blocks on both sides of the center slide and engage with the locking grooves of the tunnel segments, facilitating precise positioning and installation while strengthening the connection between the block and the segments, effectively preventing relative displacement and improving overall connection stability.

[0014] As a further description of the above technical solution: the crossbeams and the longitudinal beams intersect to form a grid, and the external cable is placed inside the grid.

[0015] The above solution provides a stable space for external cables by creating a grid of intersecting horizontal and vertical beams, which can fix the cables and prevent them from shifting or shaking. At the same time, it makes the cable arrangement neat and orderly, which is convenient for later inspection and maintenance. The grid structure can also protect the cables and improve the reliability and safety of the wiring.

[0016] As a further description of the above technical solution: the left and right sides of the sealing top plate are provided with grooves, and the outer side of the grooves corresponds to the shape of the positioning and mounting groove inside the connecting positioning shaft.

[0017] The above solution allows the groove of the sealing top plate to correspond to the shape of the positioning mounting groove of the connecting positioning shaft, enabling precise fitting and tight contact between the two. This not only improves the installation and positioning accuracy of the sealing top plate but also enhances its connection stability with the positioning shaft, while strengthening the sealing performance and ensuring the assembly and sealing reliability of the overall structure.

[0018] As a further description of the above technical solution: the inside of the shield tunnel segment is provided with a fixing groove, and the outside of the transverse steel bar block and the longitudinal steel bar block are both fixedly connected to the inside of the fixing groove.

[0019] Through the above scheme, the fixing groove inside the tunnel segment can stably accommodate the transverse and longitudinal steel bars, ensuring that the steel bars are accurately positioned and reliably connected, and preventing them from shifting or loosening. This allows the reinforcement effect of the steel bars to be fully utilized, further enhancing the integrity and robustness of the internal structure of the segment, and improving its resistance to deformation and structural stability.

[0020] In summary, this application includes at least one of the following beneficial technical effects: 1. In this utility model, the shield tunnel segments are connected by multiple positioning connecting blocks, and the connecting positioning shaft serves as the interval between the multiple shield tunnel segments. At the same time, the I-shaped design of the positioning connecting blocks allows the positioning connecting blocks to fit tightly against both sides of the shield tunnel segments. The snap-fit ​​blocks on the left and right sides of the positioning connecting blocks cooperate with the snap-fit ​​grooves on the left and right sides of the shield tunnel segments to ensure the stable connection of the shield tunnel segments and to prevent installation difficulties. Furthermore, the internal support components of the shield tunnel segments reduce the possibility of displacement of the shield tunnel segments after long-term use through their T-shaped design. 2. In this utility model, the support block fixed inside the shield tunnel segment provides support for the longitudinal beam while reducing the impact on the support block under the support of multiple support triangular plates on both sides of the support block. It also provides support for the support block to reduce the possibility of the support block shifting. At the same time, the crossbeam fixed inside the positioning connecting block and the support block intersect to form a grid, thereby providing necessary support for the subsequent cable and improving the practicality of the device. The sealing sides fixed on both sides of the positioning connecting block and the sealing top plate fixed inside the connecting positioning shaft are in close contact with the shield tunnel segment, thereby ensuring the sealing of the shield tunnel segment and reducing the risk of leakage. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of a precast segment for a shield tunnel proposed in this utility model. Figure 2 This is a schematic diagram of the structure of a support block for precast tunnel segments proposed in this utility model. Figure 3 This is a schematic diagram of the structure of the sealing side of a precast segment for a shield tunnel proposed in this utility model; Figure 4 This is a schematic diagram of the structure of the longitudinal beam of a precast segment for a shield tunnel, as proposed in this utility model. Explanation of reference numerals in the attached drawings: 1. Shield tunnel segment; 2. Anti-deviation fixing mechanism; 21. Positioning connecting block; 22. Sealing side; 23. Sealing top plate; 3. Connecting positioning shaft; 4. Auxiliary fixing mechanism; 41. Support block; 42. Supporting triangular plate; 43. Horizontal beam; 44. Longitudinal beam; 5. Support assembly; 51. Horizontal reinforcing bar block; 52. Longitudinal reinforcing bar block. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1 -Appendix Figure 4 This application will be described in further detail below.

[0023] Example: A precast segment for shield tunnels, referring to... Figure 1 , Figure 2 , Figure 4 The system comprises multiple shield tunnel segments 1, which are prefabricated components used in shield tunnel construction. Made of high-strength materials, these segments can withstand pressure from both inside and outside the tunnel. Anti-deviation fixing mechanisms 2 are fixedly connected between the multiple shield tunnel segments 1. These mechanisms are designed to prevent lateral or longitudinal displacement of the shield tunnel segments 1 during assembly and construction, ensuring the accuracy of tunnel construction. An auxiliary fixing mechanism 4 is fixedly connected to the inner side of each shield tunnel segment 1. This mechanism further strengthens the fixation and support of the inner side of the segment, preventing deformation caused by external pressure during construction. Connecting positioning shafts 3 are fixedly connected to the upper and lower sides of each shield tunnel segment 1. These shafts precisely place the shield tunnel segments 1 in their designated positions and ensure their accuracy. The design of these positioning shafts helps construction workers assemble the tunnel accurately, reducing splicing errors and thus improving the efficiency of tunnel construction. Specifically, during construction, the shield tunnel segment 1, equipped with the connecting positioning shaft 3, is first hoisted to the shield machine assembly area, and its position is initially positioned using the connecting positioning shaft 3. Then, the anti-deviation fixing mechanism 2 is installed between adjacent shield tunnel segments 1 to complete the lateral connection and position calibration of the segments. Next, an auxiliary fixing mechanism 4 is installed on the inner side of the shield tunnel segment 1 to reinforce the inner side of the segment. Through these steps, the assembly of each shield tunnel segment 1 is completed sequentially, gradually constructing a complete prefabricated shield tunnel segment structure.

[0024] The anti-deviation fixing mechanism 2 includes a positioning connecting block 21, which is designed in an I-shape to securely connect adjacent shield tunnel segments 1. The I-shape design helps improve the stability and load-bearing capacity of the connection, preventing the segments from shifting due to external forces. The outer side of the positioning connecting block 21 is slidably connected to the inner side of the shield tunnel segment 1. Sealing sides 22 are fixedly connected to the left and right sides of the outer side of the positioning connecting block 21. A sealing top plate 23 is fixedly connected inside the connecting positioning shaft 3. The sealing sides 22 and the sealing top plate 23 prevent moisture, gas, or soil from penetrating to the connection point of the shield tunnel segments, ensuring the sealing and stability of the tunnel. The outer side of the sealing side 22 and the adjacent side of the sealing top plate 23 are in contact with the shield tunnel segment 1. A support assembly 5 is fixedly connected inside the shield tunnel segment 1, and a positioning mechanism is provided inside the connecting positioning shaft 3. The shield tunnel segment 1 is externally slidably connected to the inside of the positioning installation slot. The sealing top plate 23 is externally slidably connected to the inside of the positioning installation slot. The positioning connecting block 21 adopts an I-shaped design. The center of the positioning connecting block 21 is provided with snap-fit ​​blocks on the left and right sides. The left and right sides of the shield tunnel segment 1 are provided with snap-fit ​​slots. The cooperation between the snap-fit ​​blocks and the snap-fit ​​slots allows the segment 1 to be smoothly connected during the assembly process, avoiding the complexity of manual calibration. The snap-fit ​​blocks are externally slidably connected to the inside of the snap-fit ​​slots. The left and right sides of the sealing top plate 23 are provided with grooves. The outside of the grooves corresponds to the shape of the positioning installation slot inside the connecting positioning shaft 3. Specifically, in shield tunnel construction, the shield segment 1 is first hoisted to the assembly position. Using the positioning groove on the connecting positioning shaft 3, the shield segment 1 is precisely embedded, and the sealing top plate 23 is also slid into the positioning groove. Next, the I-shaped positioning connecting block 21 is inserted into the inside of the shield segment 1, aligning the locking block with the locking groove of the shield segment 1 for sliding insertion. Then, the sealing side 22 is fixed to both sides of the positioning connecting block 21, ensuring it fits snugly against the shield segment 1. Finally, the support assembly 5 is installed inside the shield segment 1, completing the installation of the anti-deviation fixing mechanism 2, ensuring all components are in place, and laying a solid foundation for the continuous construction of the shield tunnel.

[0025] The support component 5 includes a transverse steel bar block 51, which is externally fixedly connected to the inside of the shield tunnel segment 1. A longitudinal steel bar block 52 is fixedly connected to the inside of the shield tunnel segment 1. The transverse steel bar block 51 and the longitudinal steel bar block 52 together with the shield tunnel segment 1 form a strong integral structure, which helps to improve the compressive strength of the segment. The longitudinal steel bar block 52 is externally fixedly connected to the inside of the transverse steel bar block 51. A fixing groove is opened inside the shield tunnel segment 1, and the external parts of the transverse steel bar block 51 and the longitudinal steel bar block 52 are both fixedly connected to the inside of the fixing groove. Specifically, during the prefabrication of shield tunnel segment 1, a fixing groove is first opened at the corresponding position inside the mold. The transverse reinforcing bars 51 and longitudinal reinforcing bars 52 are placed according to the design requirements, with the longitudinal reinforcing bars 52 passing through the transverse reinforcing bars 51. Then, both are placed together in the fixing groove. Next, the shield tunnel segment 1 is poured. After the concrete solidifies, the support assembly 5 and the shield tunnel segment 1 form a stable whole, which can be used for subsequent hoisting and assembly during shield tunnel construction.

[0026] Reference Figures 1 to 3 The auxiliary fixing mechanism 4 includes a support block 41, which is located at the inner center of the shield tunnel segment 1. It plays a role in enhancing the stability of the segment and distributing pressure evenly. The support block 41 is externally fixedly connected to the inner center of the shield tunnel segment 1. Multiple support triangular plates 42 are fixedly connected to the left and right sides of the support block 41. The support triangular plates 42 are connected to the left and right sides of the support block 41, which plays a role in strengthening the structural strength and maintaining the shape of the segment. The support block 41 is fixedly connected to a longitudinal beam 44. The inner side of the positioning connecting block 21 is fixedly connected to a crossbeam 43. The longitudinal beam 44 and the crossbeam 43 are installed in an alternating manner to form a grid-like structure, which enhances the fixing capacity inside the segment and can accommodate the arrangement of external cables and other facilities. The crossbeam 43 and the longitudinal beam 44 are interlaced to form a grid, and the external cables are placed inside the grid. Specifically, a support block 41 is installed at the center of the inner side of the shield tunnel segment 1, and multiple supporting triangular plates 42 are sequentially fixed on both sides of the support block 41. Then, the longitudinal beam 44 is connected and fixed to the support block 41. After installing the positioning connecting block 21 of the anti-deviation fixing mechanism 2, the crossbeam 43 is fixed to the inner side of the positioning connecting block 21. As the crossbeam 43 and longitudinal beam 44 are installed in an alternating pattern, a grid space is formed. During the shield tunnel construction process, after the tunnel segments are assembled in place, the external cable is laid within the grid formed by the crossbeam 43 and longitudinal beam 44.

[0027] The implementation principle of this application embodiment is as follows: the shield tunnel segment 1 is connected by multiple positioning connecting blocks 21, and the connecting positioning shaft 3 serves as the interval between multiple shield tunnel segments 1. At the same time, the I-shaped design of the positioning connecting block 21 allows the positioning connecting block 21 to fit tightly against both sides of the shield tunnel segment 1. The snap-fit ​​blocks on the left and right sides of the positioning connecting block 21 cooperate with the snap-fit ​​grooves on the left and right sides of the shield tunnel segment 1 to ensure the stable connection of the shield tunnel segment 1 and to ensure that the shield tunnel segment 1 will not have installation difficulties. Furthermore, the transverse steel bars 51 and longitudinal steel bars 52 inside the shield tunnel segment 1 are connected to each other to form a T-shaped design. The T-shaped design reduces the possibility of the shield tunnel segment 1 shifting after long-term use. The support block 41, fixed inside the shield tunnel segment 1, provides support for the longitudinal beam 44 while reducing its impact on the support block 41, supported by multiple support triangular plates 42 on both sides of the support block 41. It also provides support for the support block 41 to prevent it from shifting. Meanwhile, the crossbeam 43 fixed inside the positioning connecting block 21 and the support block 41 intersect to form a grid, providing necessary support for subsequent cables and improving the practicality of the device. The sealing sides 22 fixed on both sides of the positioning connecting block 21 and the sealing top plate 23 fixed inside the connecting positioning shaft 3 are in close contact with the shield tunnel segment 1, ensuring the sealing of the shield tunnel segment 1 and reducing the risk of leakage. The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A precast tunnel segment for shield tunneling, comprising multiple shield tunnel segments (1), characterized in that: An anti-deviation fixing mechanism (2) is fixedly connected between multiple shield tunnel segments (1), an auxiliary fixing mechanism (4) is fixedly connected to the inner side of the shield tunnel segment (1), and a connecting positioning shaft (3) is fixedly connected to the upper and lower sides of the shield tunnel segment (1). The anti-deviation fixing mechanism (2) includes a positioning connecting block (21). The outer side of the positioning connecting block (21) is slidably connected to the inner side of the shield tunnel segment (1). Sealing side edges (22) are fixedly connected to the left and right sides of the positioning connecting block (21). A sealing top plate (23) is fixedly connected inside the connecting positioning shaft (3). The outer side of the sealing side edge (22) and the side of the sealing top plate (23) that are close to each other are in contact with the shield tunnel segment (1). A support component (5) is fixedly connected inside the shield tunnel segment (1).

2. A precast segment for a shield tunnel according to claim 1, characterized in that: The auxiliary fixing mechanism (4) includes a support block (41), which is externally fixedly connected to the center of the inner side of the shield tunnel segment (1). Multiple support triangular plates (42) are fixedly connected to the left and right sides of the support block (41). A longitudinal beam (44) is fixedly connected to the support block (41). A crossbeam (43) is fixedly connected to the inner side of the positioning connection block (21).

3. A precast segment for a shield tunnel according to claim 1, characterized in that: The support component (5) includes a transverse steel bar block (51), the outside of which is fixedly connected to the inside of the shield tunnel segment (1), and a longitudinal steel bar block (52) is fixedly connected to the inside of the shield tunnel segment (1), the outside of which is fixedly connected to the inside of the transverse steel bar block (51).

4. A precast segment for a shield tunnel according to claim 1, characterized in that: The connecting positioning shaft (3) has a positioning installation groove inside, the shield tunnel segment (1) is slidably connected to the inside of the positioning installation groove, and the sealing top plate (23) is slidably connected to the inside of the positioning installation groove.

5. A precast segment for a shield tunnel according to claim 1, characterized in that: The positioning connecting block (21) adopts an I-shaped design. The center of the positioning connecting block (21) is provided with snap-fit ​​blocks on the left and right sides. The shield tunnel segment (1) is provided with snap-fit ​​grooves on the left and right sides. The outside of the snap-fit ​​block is slidably connected to the inside of the snap-fit ​​groove.

6. A precast segment for a shield tunnel according to claim 2, characterized in that: The crossbeams (43) and the longitudinal beams (44) intersect to form a grid, and the external cables are placed inside the grid.

7. A precast segment for a shield tunnel according to claim 1, characterized in that: The sealing top plate (23) has grooves on its left and right sides, and the outer side of the grooves corresponds to the shape of the positioning and mounting groove inside the connecting positioning shaft (3).

8. A precast segment for a shield tunnel according to claim 3, characterized in that: The shield tunnel segment (1) has a fixing groove inside, and the external parts of the transverse steel bar block (51) and the longitudinal steel bar block (52) are fixedly connected to the inside of the fixing groove.

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