A precast segment assembly for a tunnel

Abstract

The utility model relates to tunnel segment engineering field, concretely relates to a prefabricated segment assembly for tunnel, including lower segment, side segment and upper segment. The inner wall of side segment is equipped with first support hole and second support hole, and first support hole is used for fixing the belt support of continuous belt, and second support hole is used for fixing cable support, the inner wall of upper segment is equipped with first derrick hole and second derrick hole, and first derrick hole is used for fixing the belt derrick of continuous belt, and second derrick hole is used for fixing the wind belt derrick of wind belt, the inner thread sleeve is equipped in first support hole, second support hole, first derrick hole and second derrick hole, and the inner thread sleeve is connected with the inside steel reinforcement cage of side segment or the inside steel reinforcement cage of upper segment through steel bar welding, the utility model can avoid the damage of drilling to segment structure, and improves the installation efficiency of cable support, continuous belt support and wind belt derrick.

Description

Technical Field

[0001] This utility model relates to the field of tunnel segment engineering, and in particular to a prefabricated segment assembly for tunnels. Background Technology

[0002] In segment tunnel construction using tunnel boring machines (TBMs), the conventional practice is to install the segments inside the already excavated tunnel. Subsequently, drilling is performed at specific locations on the inner wall of the segments to secure cable supports, continuous belt supports, and ventilation belt hangers. However, this post-drilling method has two main drawbacks: firstly, it poses a significant risk of damaging the structural integrity of the segments during the drilling process, affecting their performance and the overall safety of the tunnel; secondly, the post-drilling process is cumbersome, severely limiting the installation efficiency of cable supports, continuous belt supports, and ventilation belt hangers, leading to delays in construction and increased costs and time investment. Utility Model Content

[0003] The purpose of this invention is to overcome the problems in the existing technology where post-drilling of tunnel segments easily leads to structural damage to the segments and restricts the installation efficiency of cable supports, continuous belt supports, and ventilation belt hangers. Therefore, this invention provides a prefabricated tunnel segment assembly for tunnels.

[0004] This utility model provides a precast segment assembly for tunnels, including a lower segment, two side segments and an upper segment. The two ends of the lower segment are respectively connected to the lower ends of the two side segments in the circumferential direction, and the two ends of the upper segment are respectively connected to the upper ends of the two side segments in the circumferential direction. The lower segment, the two side segments and the upper segment are all precast structures. The inner wall of the side tube is provided with a first bracket hole and a second bracket hole. The first bracket hole is used to fix the belt bracket of the continuous belt, and the second bracket hole is used to fix the cable bracket. The inner wall of the upper tube segment is provided with a first hanger hole and a second hanger hole. The first hanger hole is used to fix the belt hanger of the continuous belt, and the second hanger hole is used to fix the air belt hanger. The first support hole, the second support hole, the first hanger hole, and the second hanger hole are all provided with internal threaded sleeves; the internal threaded sleeves are connected to the internal steel reinforcement skeleton of the side tube segment or the internal steel reinforcement skeleton of the upper tube segment by steel reinforcement welding.

[0005] The first bracket hole and the second bracket hole are pre-formed integrally with the side tube segment; The first and second suspension rod holes are prefabricated integrally with the upper tube segment.

[0006] This utility model provides a precast tunnel segment assembly. The lower segment forms the bottom support structure of the tunnel, the side segments form the side support structure, and the upper segment forms the top support structure. The lower segment, two side segments, and the upper segment can be spliced ​​to form a ring structure, which serves as the tunnel's inner lining structure, i.e., the main structural component of the precast tunnel segment assembly. The first support hole and the second support hole are used to fix the belt support and cable support of the continuous conveyor belt, respectively. The first hanger hole and the second hanger hole are used to fix the belt hanger of the continuous conveyor belt and the air belt hanger of the ventilation belt, respectively. The internally threaded sleeve can directly mate with the screw, thereby more conveniently fixing the belt support, cable support, belt hanger, and ventilation belt hanger into place. The internally threaded sleeve is fixed by welding with the aid of reinforcing bars. This connection method ensures a more precise connection position of the internally threaded sleeve, and its position is less likely to shift or change during concrete pouring.

[0007] Since the first support hole and the second support hole are prefabricated integrally with the side segment, and the first hanger hole and the second hanger hole are prefabricated integrally with the upper segment, there is no need to perform drilling operations after the side segment and the upper segment are installed in the tunnel. This allows the cable support, continuous belt support, and ventilation belt hanger to be directly installed on the side segment or the upper segment, thereby avoiding damage to the segment structure caused by drilling and improving the installation efficiency of the cable support, continuous belt support, and ventilation belt hanger. This is of great significance for accelerating the tunnel construction progress and reducing project costs.

[0008] The lower segment and the side segment can be joined together or staggered along the axis of the precast segment assembly. Similarly, the upper segment and the side segment can be joined together or staggered along the axis of the precast segment assembly. Jointing means that the circumferential end face of the side segment is connected to only one lower segment or one upper segment; while staggered joining means that the circumferential end face of the side segment can be connected to two adjacent lower segments or two adjacent upper segments simultaneously.

[0009] Preferably, the lower segment and the side segment are staggered and spliced ​​on the axis of the prefabricated segment assembly, and the upper segment and the side segment are also staggered and spliced ​​on the axis of the prefabricated segment assembly. Compared to a direct splicing method, the staggered splicing between the lower segment and the side segment, and between the upper segment and the side segment, enhances the integrity and stability of the entire prefabricated segment assembly after it is assembled into a ring structure.

[0010] The circumferential end faces of the lower tube segment, the side tube segment, and the upper tube segment can all be a plane perpendicular to the circumferential direction, or they can be two protruding inclined surfaces.

[0011] Preferably, the lower tube segment, the side tube segment, and the upper tube segment each have two inclined surfaces on their circumferential end faces. These two inclined surfaces bulge circumferentially to form an isosceles triangle structure. The two inclined surfaces at the upper end of the side tube segment can respectively connect with the inclined surfaces of two adjacent upper tube segments, and the two inclined surfaces at the lower end of the side tube segment can respectively connect with the inclined surfaces of two adjacent lower tube segments. This design allows for faster alignment and splicing of the tube segments during the staggered splicing process.

[0012] Preferably, a first through hole is provided between the inner wall of the lower tube segment and its circumferential end face, a second through hole is provided between the inner wall of the side tube segment and its circumferential end face, and a third through hole is provided between the inner wall of the upper tube segment and its circumferential end face; the first through hole can be circumferentially aligned with the corresponding second through hole, and the third through hole can be circumferentially aligned with the corresponding second through hole. In this design, the first through hole, the second through hole, and the third through hole are all used to pass through a circumferential screw, so that two circumferentially adjacent tube segments can be stably connected.

[0013] Preferably, the inner wall of the lower tube segment has a first groove at the location of the first through hole, the inner wall of the side tube segment has a second groove at the location of the second through hole, and the inner wall of the upper tube segment has a third groove at the location of the third through hole. In this design, the first, second, and third grooves are all used to accommodate the end of the circumferential screw, preventing the end of the circumferential screw from protruding outwards from the inner walls of the lower, side, and upper tube segments.

[0014] The first groove, the second groove, and the third groove can all be circular, rectangular, or horseshoe-shaped.

[0015] Preferably, the first groove, the second groove, and the third groove are all horseshoe-shaped. In this design, compared to circles and rectangles, setting the first groove, the second groove, and the third groove to be horseshoe-shaped is more suitable for accommodating the end of the circumferential screw, and can reduce the volume of the slot.

[0016] Preferably, the lower segment has a first grouting hole, the side segment has a second grouting hole, and the upper segment has a third grouting hole. In this design, after the segments are installed inside the excavated tunnel, the first, second, and third grouting holes all serve to connect the grouting pipes, allowing grout to be injected into the gap between the outer wall of the segment and the tunnel wall.

[0017] Preferably, a support block is provided on the outer wall of the lower segment. In this design, the function of the support block is to separate the outer wall of the lower segment from the tunnel wall, thereby creating a certain gap between the outer wall of the lower segment and the tunnel wall, providing operating space for subsequent grouting operations.

[0018] Preferably, a drainage ditch is provided on the inner wall of the lower segment. During actual construction, the main function of the drainage ditch is to guide and discharge accumulated water on the lower segment to the outside, thereby effectively preventing water from accumulating at the bottom of the lower segment, avoiding adverse effects on construction operations due to water accumulation, and ensuring the smooth progress of construction.

[0019] Preferably, the lower tube segment, the side tube segment, and the upper tube segment are provided with strip-shaped grooves on their circumferential and axial end faces, and the strip-shaped grooves are used to fix the water-swellable waterstop.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention provides a precast tunnel segment assembly. By using the first support hole, second support hole, first hanger hole, and second hanger hole provided on the segment, drilling is not required after the side segment and the upper segment are installed in the tunnel. This allows cable supports, continuous belt supports, and ventilation belt hangers to be directly installed on the side segment or the upper segment, thereby avoiding damage to the segment structure caused by drilling and improving the installation efficiency of cable supports, continuous belt supports, and ventilation belt hangers. This is of great significance for accelerating tunnel construction and reducing project costs. Attached Figure Description

[0021] Figure 1 This is a first-view three-dimensional structural diagram of a precast segment assembly for tunnels.

[0022] Figure 2 This is a two-dimensional structural schematic diagram of a precast segment assembly for tunnels from a second perspective.

[0023] Figure 3 This is a three-dimensional structural diagram from a third-view perspective of a precast segment assembly for tunnels.

[0024] Figure 4 This is a schematic diagram showing the continuous belt and air belt fixed to the tube segment.

[0025] Marked in the image: 1-Lower segment, 101-First grouting hole, 102-Drainage ditch, 103-Support block, 104-First through hole, 2-Side segments, 201 - Second grouting hole, 202 - Second through hole, 203 - First support hole, 204 - Second support hole 3-Upper segment, 301 - Third grouting hole, 302 - Third through hole, 303 - First hanger hole, 304 - Second hanger hole 4-Axial screw, 5-Circumferential screw, 6-Continuous belt, 601 - Belt support bracket, 602 - Belt hanger rod 7-Wind belt, 701-Wind Belt Hanger, 8-Cable bracket. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0027] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer" used in the description of specific embodiments of this utility model to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0029] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0030] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0031] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0032] Example 1 like Figures 1 to 4As shown, a precast tunnel segment assembly includes a lower segment 1, two side segments 2, and an upper segment 3. The two ends of the lower segment 1 are connected circumferentially to the lower ends of the two side segments 2, and the two ends of the upper segment 3 are connected circumferentially to the upper ends of the two side segments 2. The lower segment 1, the two side segments 2, and the upper segment 3 are all precast structures. Specifically, the lower segment 1, the side segments 2, and the upper segment 3 are all precast reinforced concrete structures.

[0033] The inner wall of the side tube segment 2 is provided with a first support hole 203 and a second support hole 204. The first support hole 203 is used to fix the belt bracket 601 of the continuous belt 6, and the second support hole 204 is used to fix the cable bracket 8. Specifically, the height of the second support hole 204 is lower than that of the first support hole 203. The position and diameter of the first support hole 203, the second support hole 204, the first hanger hole 303, and the second hanger hole 304 are set according to actual needs. The depth of the first support hole 203, the second support hole 204, the first hanger hole 303, and the second hanger hole 304 can all be 0.3 to 0.7 times the thickness of the corresponding tube segment.

[0034] The inner wall of the upper tube segment 3 is provided with a first hanger hole 303 and a second hanger hole 304. The first hanger hole 303 is used to fix the belt hanger 602 of the continuous belt 6, and the second hanger hole 304 is used to fix the air belt hanger 701 of the air belt 7.

[0035] The first support hole 203, the second support hole 204, the first hanger hole 303, and the second hanger hole 304 are all provided with internal threaded sleeves; the internal threaded sleeves are connected to the internal steel reinforcement skeleton of the side tube 2 or the internal steel reinforcement skeleton of the upper tube 3 by steel reinforcement welding.

[0036] The internally threaded sleeve can be made of steel or stainless steel. The outer wall of the internally threaded sleeve has textured surfaces to enhance the interlocking connection between the internally threaded sleeve and the concrete.

[0037] In the above solution, the internally threaded sleeve can directly mate with the screw, thus more conveniently fixing the belt bracket 601, cable bracket 8, belt hanger 602, and fan belt hanger 701 into place. If the internally threaded sleeve is not provided, matching expansion bolts are required for fixing. Specifically, the expansion bolts are installed first, and after they are firmly secured, the belt bracket 601, cable bracket 8, belt hanger 602, and fan belt hanger 701 are then fixed using the expansion bolts. This solution, by using the internally threaded sleeve, eliminates the series of arrangement work required for expansion bolt fixing. For example, there is no need to pre-install and adjust the expansion bolts at the mounting hole locations, simplifying the entire installation process and significantly improving installation efficiency.

[0038] Compared to fixing the internally threaded sleeve by binding, the above solution uses steel bars as an aid and a welding connection to fix the internally threaded sleeve. This connection method ensures a more precise connection position for the internally threaded sleeve, and its position is less likely to shift or change during concrete pouring.

[0039] In an optional embodiment, the lower segment 1 and the side segment 2 may be staggered and spliced ​​on the axis of the precast segment assembly, and the upper segment 3 and the side segment 2 may be staggered and spliced ​​on the axis of the precast segment assembly.

[0040] In an optional embodiment, the circumferential end faces of the lower tube segment 1, the side tube segment 2, and the upper tube segment 3 can each be provided with two inclined surfaces. The two inclined surfaces protrude circumferentially to form an isosceles triangle structure. The two inclined surfaces at the upper end of the side tube segment 2 can respectively connect with the inclined surfaces of the two adjacent upper tube segments 3, and the two inclined surfaces at the lower end of the side tube segment 2 can respectively connect with the inclined surfaces of the two adjacent lower tube segments 1.

[0041] Specifically, the lower segment 1, the side segment 2, and the upper segment 3, when flattened, form a hexagonal shape. The hexagonal shape refers to the shape formed by stretching the midpoints of the two short plates outward along a direction parallel to the long side by a certain length, based on a rectangle.

[0042] In an optional embodiment, a first through hole 104 may be provided between the inner wall of the lower tube segment 1 and its circumferential end face, a second through hole 202 may be provided between the inner wall of the side tube segment 2 and its circumferential end face, and a third through hole 302 may be provided between the inner wall of the upper tube segment 3 and its circumferential end face. The first through hole 104 and the corresponding second through hole 202 can be aligned circumferentially with each other. The first through hole 104, the second through hole 202, and the third through hole 302 are all used for the circumferential screw 5 to pass through, so that two circumferentially adjacent tube segments can be connected.

[0043] In an optional embodiment, a first groove may be provided on the inner wall of the lower tube segment 1 at the position of the first through hole 104, a second groove may be provided on the inner wall of the side tube segment 2 at the position of the second through hole 202, and a third groove may be provided on the inner wall of the upper tube segment 3 at the position of the third through hole 302.

[0044] In an optional embodiment, the first groove, the second groove, and the third groove can all be horseshoe-shaped.

[0045] In an optional embodiment, the lower segment 1 may be provided with a first grouting hole 101, the side segment 2 may be provided with a second grouting hole 201, and the upper segment 3 may be provided with a third grouting hole 301. Specifically, the first grouting hole 101 penetrates the entire thickness of the lower segment 1, the second grouting hole 201 penetrates the entire thickness of the side segment 2, and the third grouting hole 301 penetrates the entire thickness of the upper segment 3.

[0046] In an optional embodiment, a support block 103 may be provided on the outer wall of the lower tube segment 1. Specifically, there may be two support blocks 103 on each lower tube segment 1, and the two support blocks 103 are arranged symmetrically in the circumferential direction on the outer wall of the lower tube segment 1.

[0047] In an optional embodiment, a drainage ditch 102 may be provided on the inner wall of the lower segment 1.

[0048] In an optional embodiment, strip grooves may be provided on the circumferential end faces and axial end faces of the lower tube segment 1, the side tube segment 2 and the upper tube segment 3, and the strip grooves are used to fix the water-swellable waterstop.

[0049] When multiple precast segment assemblies are arranged axially in the tunnel, they can form the tunnel lining structure. Adjacent lower segments 1, adjacent side segments 2, and adjacent upper segments 3 along the tunnel axis can be connected by axial screws 4.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A precast segment assembly for a tunnel, comprising a lower segment (1), two side segments (2), and an upper segment (3), wherein the two ends of the lower segment (1) are respectively connected to the lower ends of the two side segments (2) in the circumferential direction, and the two ends of the upper segment (3) are respectively connected to the upper ends of the two side segments (2) in the circumferential direction, wherein the lower segment (1), the two side segments (2), and the upper segment (3) are all precast structures, characterized in that: The inner wall of the side tube (2) is provided with a first bracket hole (203) and a second bracket hole (204). The first bracket hole (203) is used to fix the belt bracket (601) of the continuous belt (6), and the second bracket hole (204) is used to fix the cable bracket (8). The inner wall of the upper tube segment (3) is provided with a first hanger hole (303) and a second hanger hole (304). The first hanger hole (303) is used to fix the belt hanger (602) of the continuous belt (6), and the second hanger hole (304) is used to fix the wind belt hanger (701) of the wind belt (7). The first support hole (203), the second support hole (204), the first hanger hole (303) and the second hanger hole (304) are all provided with internal threaded sleeves; the internal threaded sleeves are connected to the internal steel reinforcement skeleton of the side tube segment (2) or the internal steel reinforcement skeleton of the upper tube segment (3) by steel reinforcement welding.

2. A precast segment assembly for tunnels according to claim 1, characterized in that, The lower segment (1) and the side segment (2) are staggered and spliced ​​on the axis of the precast segment assembly, and the upper segment (3) and the side segment (2) are staggered and spliced ​​on the axis of the precast segment assembly.

3. A precast segment assembly for tunnels according to claim 2, characterized in that, The lower tube segment (1), the side tube segment (2), and the upper tube segment (3) each have two inclined surfaces on their circumferential end faces. The two inclined surfaces bulge out along the circumferential direction to form an isosceles triangle structure. The two inclined surfaces at the upper end of the side tube segment (2) can respectively connect with the inclined surfaces of the two adjacent upper tube segments (3), and the two inclined surfaces at the lower end of the side tube segment (2) can respectively connect with the inclined surfaces of the two adjacent lower tube segments (1).

4. A precast segment assembly for tunnels according to any one of claims 1-3, characterized in that, The lower tube segment (1) has a first through hole (104) between its inner wall and circumferential end face, the side tube segment (2) has a second through hole (202) between its inner wall and circumferential end face, and the upper tube segment (3) has a third through hole (302) between its inner wall and circumferential end face; the first through hole (104) can be circumferentially aligned with the corresponding second through hole (202), and the third through hole (302) can be circumferentially aligned with the corresponding second through hole (202).

5. A precast segment assembly for tunnels according to claim 4, characterized in that, The lower tube segment (1) has a first groove on its inner wall at the position of the first through hole (104), the side tube segment (2) has a second groove on its inner wall at the position of the second through hole (202), and the upper tube segment (3) has a third groove on its inner wall at the position of the third through hole (302).

6. A precast segment assembly for tunnels according to claim 5, characterized in that, The first groove, the second groove, and the third groove are all horseshoe-shaped.

7. A precast segment assembly for tunnels according to claim 4, characterized in that, The lower segment (1) is provided with a first grouting hole (101), the side segment (2) is provided with a second grouting hole (201), and the upper segment (3) is provided with a third grouting hole (301).

8. A precast segment assembly for tunnels according to claim 4, characterized in that, The lower tube segment (1) is provided with a support block (103) on its outer wall.

9. A precast segment assembly for tunnels according to claim 4, characterized in that, The inner wall of the lower segment (1) is provided with a drainage ditch (102).

10. A precast segment assembly for tunnels according to claim 4, characterized in that, The lower tube segment (1), the side tube segment (2) and the upper tube segment (3) are all provided with strip-shaped grooves on their circumferential end faces and axial end faces. The strip-shaped grooves are used to fix the water-swellable waterstop.

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