Reinforced concrete shield segment suitable for laser scanning identification
By introducing a combination structure of annular steel cages and spiral reinforcement bars into the tunnel lining segments, the problem of insufficient load-bearing capacity of existing reinforced concrete segments has been solved, thereby improving load-bearing capacity and material utilization, and reducing production costs and construction excavation volume.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA COAL DATONG ENERGY CO LTD
- Filing Date
- 2025-09-18
- Publication Date
- 2026-08-04
AI Technical Summary
Existing reinforced concrete shield tunnel segments have insufficient bearing capacity under deep burial conditions, exhibit obvious brittle failure characteristics, consume a large amount of materials, and have low material utilization during construction.
The reinforced concrete shield tunnel segments, identified by laser scanning, form multi-directional constraints through a combination of annular steel cages, spiral reinforcement bars, and concrete, thereby increasing the strength of the core concrete. The segments are then assembled simply and reliably using bolted connections.
It improved the load-bearing capacity of the tunnel segments, reduced material usage and production costs, and also reduced the amount of tunnel excavation during construction, thus improving material utilization and construction efficiency.
Smart Images
Figure CN224592137U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to reinforced concrete shield tunnel segments that are applicable to laser scanning identification, and belongs to the field of coal mine support engineering technology. Background Technology
[0002] Tunnel boring machine (TBM) segments are the main assembly components in the construction of inclined shaft tunnels in coal mines. They form the innermost barrier of the inclined shaft, resisting soil pressure, groundwater pressure, and other special loads. TBM segments are the permanent lining structure of inclined shaft tunnels in coal mines. The shield tunneling method is a safe, efficient, and environmentally friendly method for constructing inclined shaft tunnels in coal mines, and tunnel segments are used as the lining support structure in shield tunneling construction.
[0003] Currently, reinforced concrete segments are commonly used as lining segments in shield tunneling construction. To meet the load-bearing capacity requirements of inclined shaft linings under deep burial conditions, reinforced concrete segments suffer from problems such as large size, significant brittle failure characteristics, and high material consumption. Summary of the Invention
[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide reinforced concrete shield tunnel segments that are suitable for laser scanning identification. Compared with traditional reinforced concrete tunnel segments, the bearing capacity is improved while the thickness of the segments is reduced, thereby improving material utilization, reducing production costs, and reducing the amount of excavation in coal mine inclined shafts during construction.
[0005] To achieve the above objectives, this utility model employs the following technical solution:
[0006] In a first aspect, this utility model provides reinforced concrete shield tunnel segments suitable for laser scanning identification, comprising multiple prefabricated segment assemblies spliced and fixed along the circumferential direction, each of the prefabricated segment assemblies comprising:
[0007] An annular reinforcing cage, which is the structural framework of the precast segment assembly;
[0008] Spiral reinforcement bars and annular structural reinforcement bars, multiple sets of the spiral reinforcement bars and annular structural reinforcement bars extend circumferentially along the inside of the annular steel cage and are axially spaced apart, the spiral reinforcement bars and annular structural reinforcement bars are adjacent to each other and are fixedly connected to the annular steel cage by positioning members;
[0009] The concrete includes a protective layer concrete, an interlayer concrete, and a core concrete. The protective layer concrete covers the outside of the annular reinforcing cage, the interlayer concrete fills the space between the annular reinforcing cage and the spiral reinforcement bars, and the core concrete fills the internal space of the spiral reinforcement bars.
[0010] Furthermore, the annular steel cage includes circumferential main bars, radial bars, and axial bars. The circumferential main bars are distributed at intervals along the radial and axial directions of the pipe segment. The radial bars are distributed at intervals along the circumferential and axial directions of the pipe segment. The axial bars are distributed at intervals along the circumferential and radial directions of the pipe segment. The radial bars and axial bars form a rectangular frame, and multiple rectangular frames are connected in series along the circumferential direction through the circumferential main bars.
[0011] Furthermore, the annular steel cage has multiple closed sub-chambers inside, each with a rectangular cross-section and spiral reinforcement bars fixedly positioned at the center of the closed sub-chamber.
[0012] Furthermore, the spiral ribs are distributed at intervals or sequentially within each closed sub-cavity.
[0013] Furthermore, there are multiple annular structural ribs adjacent to the spiral rib, and these multiple annular structural ribs are distributed circumferentially at intervals inside or outside the space defined by the spiral rib.
[0014] Furthermore, the spiral reinforcement bars and the annular structural reinforcement bars are fixed by binding or welding.
[0015] Furthermore, the annular structural reinforcement is an arc-shaped steel pipe or a reinforcing bar.
[0016] Furthermore, the precast segments are assembled using either through-joint or staggered joints, and the mating surfaces of two adjacent precast segments are first coated with sealant before being secured with bolts.
[0017] Furthermore, the spiral reinforcement bars are at least partially embedded in the core concrete.
[0018] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:
[0019] I. This utility model embeds spiral reinforcement bars within the concrete of a ring-shaped reinforcing cage. The spiral reinforcement bars constrain the core concrete within the ring-shaped reinforcing cage. The core concrete is doubly constrained by the reinforcing cage and the spiral reinforcement bars, resulting in increased strength in multiple directions, thereby enhancing the load-bearing capacity of the reinforced concrete tunnel segment. Compared to traditional reinforced concrete tunnel segments, not only is the load-bearing capacity improved, but the thickness of the tunnel segment is also reduced, increasing material utilization, lowering production costs, and reducing the amount of tunnel excavation during the construction of inclined shafts in coal mines using segment support. Furthermore, the reinforced concrete tunnel segment of this utility model can utilize a 3D laser scanner to identify problems such as non-compactness and poor waterproofing during the assembly process.
[0020] II. The main skeleton of the prefabricated reinforced concrete shield tunnel segment assembly of this utility model is a ring-shaped steel cage, which is simple to process and manufacture. The spiral reinforcement bars are fixed by the ring-shaped structural bars, ensuring that the spacing between each spiral section remains consistent. While meeting design requirements, this minimizes the processing and manufacturing difficulty of the prefabricated reinforced concrete shield tunnel segment assembly and improves processing efficiency. The prefabricated reinforced concrete shield tunnel segment assemblies of this utility model are connected by bolts, a simple and reliable connection method, and the reinforced concrete shield tunnel segments are easy to form. Attached Figure Description
[0021] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:
[0022] Figure 1 A schematic diagram of a prefabricated segment assembly for reinforced concrete shield tunnel segments suitable for laser scanning identification, provided for an embodiment of this utility model;
[0023] Figure 2 A schematic diagram of the prefabricated frame of reinforced concrete shield tunnel segments suitable for laser scanning identification provided in this embodiment of the utility model;
[0024] Figure 3 A top view of the prefabricated frame of reinforced concrete shield tunnel segments suitable for laser scanning identification provided in this embodiment of the utility model;
[0025] Figure 4 A schematic diagram of an annular reinforcing cage for reinforced concrete shield tunnel segments suitable for laser scanning identification, provided as an embodiment of this utility model.
[0026] Figure 5 A schematic diagram showing the binding of spiral reinforcement bars, annular structural reinforcement bars, and positioning components of reinforced concrete shield tunnel segments suitable for laser scanning identification, provided for embodiments of this utility model.
[0027] Figure 6 A schematic diagram of reinforced concrete shield tunnel segments suitable for laser scanning identification, provided for embodiments of this utility model.
[0028] In the diagram: 1. Circular reinforcing cage; 11. Circumferential main reinforcement; 12. Radial reinforcement; 13. Axial reinforcement; 2. Spiral reinforcement bar; 3. Circular structural reinforcement; 4. Positioning element; 5. Concrete; 51. Protective layer concrete; 52. Interlayer concrete; 53. Core concrete. Detailed Implementation
[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.
[0030] The following detailed description is exemplary and intended to provide further detailed explanation of the present invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this invention.
[0031] Example:
[0032] This embodiment provides a laser-scanable reinforced concrete shield tunnel segment that can be identified by laser scanning. As the permanent lining of inclined coal mine shafts, the reinforced concrete shield tunnel segment needs to withstand loads such as soil pressure and groundwater pressure. The shield tunnel segment integrates structural load-bearing, waterproofing, and construction efficiency, making it a key component for the safe and efficient construction of inclined shafts. In the reinforced concrete shield tunnel segment, the reinforcing bars are arranged in a dense grid (such as circumferential and longitudinal reinforcement) to constrain the concrete, making it less prone to cracking under compression, while also bearing tensile stress, thus improving the overall bending and shear resistance of the segment.
[0033] Reference Figure 1 , Figure 2 and Figure 3 The reinforced concrete shield tunnel segment is composed of multiple arc-shaped prefabricated reinforced concrete segment components. Each prefabricated component includes an annular reinforcing cage 1, spiral reinforcement bars 2, annular structural reinforcement bars 3, positioning components 4, and concrete 5. The annular reinforcing cage 1 serves as the main skeleton of the prefabricated segment component, enclosing the interior of the component and also housing the spiral reinforcement bars 2, annular structural reinforcement bars 3, positioning components 4, and concrete 5. After the annular reinforcing cage 1, spiral reinforcement bars 2, and annular structural reinforcement bars 3 are fixedly connected, a reinforced concrete shield tunnel segment skeleton is formed. Formwork is then erected outside the skeleton, and finally, concrete 5 is poured into the mold. After the concrete 5 is poured, the connection between the annular reinforcing cage 1, spiral reinforcement bars 2, and annular structural reinforcement bars 3 is more stable. The spiral reinforcement bars 2 are spiral structures located inside the annular reinforcing cage 1 and extending circumferentially along the annular reinforcing cage 1. Multiple spiral reinforcement bars 2 are constructed, and these bars are spaced apart axially from each other within the annular reinforcing cage 1.
[0034] It should be noted that concrete 5 includes the protective layer concrete 51 on the outside of the annular reinforcing cage 1, the interlayer concrete 52 flowing into the space between the spiral reinforcement 2 and the annular reinforcing cage 1, and the core concrete 53 within the space defined by the spiral reinforcement 2. The spiral reinforcement 2 provides restraint for the core concrete 53; the annular reinforcing cage 1 and the spiral reinforcement 2 provide combined restraint for the core concrete 53, while the annular reinforcing cage 1 also provides restraint for the interlayer concrete 52, thereby increasing the strength of concrete 5 and thus improving the load-bearing capacity of the tunnel lining segments.
[0035] The spiral reinforcement 2 is at least partially embedded in the concrete 5. For example, the spiral reinforcement 2 extends circumferentially in the annular reinforcing cage 1 and its length is flush with that of the annular reinforcing cage 1. The spiral reinforcement 2 acts as a reinforcing rib of the reinforced concrete shield tunnel segment, providing constraint to the core concrete 53, thereby improving the internal strength of the reinforced concrete shield tunnel segment in multiple directions and thus increasing its load-bearing capacity. In this embodiment, the shield tunnel segment, by incorporating the spiral reinforcement 2 inside the annular reinforcing cage 1, differs from existing reinforcing ribs (e.g., straight or crisscrossed types), resulting in a stronger load-bearing capacity. Therefore, fewer spiral reinforcement ribs 2 can be used to achieve the same load-bearing capacity, improving material utilization and significantly reducing the cost of reinforcing ribs. Furthermore, the annular reinforcing cage 1, in conjunction with the spiral reinforcement 2, provides dual constraint to the core concrete 53 inside the spiral reinforcement 2, resulting in better load-bearing performance of the shield tunnel segment. Compared to traditional reinforced concrete tunnel segments, this reduces the thickness of the shield tunnel segment, decreases the amount of tunnel excavation, and lowers production costs.
[0036] Please refer to Figure 4 In this embodiment, the annular reinforcing cage 1 includes circumferential main bars 11, radial bars 12, and axial bars 13, and the types of these three types of bars can be different. The annular reinforcing cage 1 is arc-shaped, and the longitudinal cross-section of the sub-cavities formed inside is rectangular. Setting the cross-section of the sub-cavities as rectangular is beneficial for the fabrication of reinforced concrete shield tunnel segments and reduces the generation of eccentric forces in the cross-section of the sub-cavities. Multiple annular reinforcing cages 1 can be spliced end to end in the circumference of the tunnel segments to form a ring. It should be noted that "multiple" here can be five, six, seven, etc., depending on the actual working conditions.
[0037] Multiple radial reinforcing bars 12 and axial reinforcing bars 13 can be installed inside the annular reinforcing cage 1. The number of radial reinforcing bars 12 can be set as needed, such as three, four, or five. Several radial reinforcing bars 12 are spaced apart along the axial direction of the annular reinforcing cage 1, thereby dividing the internal space of the annular reinforcing cage 1 into multiple sub-chambers. Each sub-chamber extends circumferentially along the annular reinforcing cage 1. The division of the internal space of the annular reinforcing cage 1 into multiple sub-chambers by the radial reinforcing bars 12 and axial reinforcing bars 13 facilitates the placement of the spiral reinforcing bars 2.
[0038] At least a portion of the sub-chambers are provided with spiral ribs 2. In this embodiment, each sub-chamber is provided with one spiral rib 2. In other embodiments, one spiral rib 2 may be provided every other sub-chamber. The specific number of spiral ribs 2 can be designed according to the required bearing capacity of the shield tunnel segment. The higher the required bearing capacity of the shield tunnel segment, the more spiral ribs 2 can be provided.
[0039] To improve the constraint effect of the annular reinforcing cage 1 and the spiral reinforcement 2 on the concrete 5, the cross-sectional structure of the sub-chamber is preferably designed as rectangular, and can be further designed as square. With a square design, the spiral reinforcement 2 is embedded in the center of the sub-chamber, making the thickness of the interlayer concrete 52 between the annular reinforcing cage 1 and the spiral reinforcement 2 more uniform, thereby improving the constraint effect of the annular reinforcing cage 1 on the interlayer concrete 52.
[0040] Reference Figure 2 and Figure 5 The annular structural reinforcement 3 is disposed within the internal space of the annular steel cage 1, extending circumferentially along the annular steel cage 1 and adjacent to the spiral reinforcement 2. Embedded within the concrete 5, the annular structural reinforcement 3 provides circumferential bearing capacity to the tunnel segment, further enhancing its bearing capacity. The annular structural reinforcement 3 can be disposed either inside or outside the space defined by the spiral reinforcement 2. In this embodiment, the annular structural reinforcement 3 is disposed inside the space defined by the spiral reinforcement 2 and is fixedly connected to the spiral reinforcement 2. By fixing the spiral reinforcement 2 to the annular structural reinforcement 3, the spiral reinforcement 2 and the annular structural reinforcement 3 form a reinforced structural assembly, thereby further improving the bearing capacity of the tunnel segment. Additionally, the annular structural reinforcement 3 also serves to position the spiral reinforcement 2. Finally, the spiral reinforcement 2 and the annular structural reinforcement 3 are connected and fixed to the annular steel cage 1 using positioning components 4.
[0041] The spiral reinforcement 2 includes multiple spiral sections 21, each of which is fixedly connected to the annular structural reinforcement 3. The connection method can be either binding or welding; in this embodiment, it is binding. By connecting each spiral section 21 to the annular structural reinforcement 3, the extension length of each spiral section 21 is controlled. Furthermore, the extension length of each spiral section 21 is equal, allowing the spiral reinforcement 2 to uniformly constrain the core concrete 53, thus improving the constraint effect of the spiral reinforcement 2 on the core concrete 53.
[0042] The annular structural reinforcement 3 is designed to be multiple and spaced apart circumferentially along the spiral reinforcement 2. In this embodiment, there are two annular structural reinforcement 3s; in other embodiments, the number of annular structural reinforcement 3s can be other numbers. The multiple annular structural reinforcement 3s further provide circumferential bearing capacity for the shield tunnel segment. Since the multiple annular structural reinforcement 3s are spaced apart circumferentially along the spiral reinforcement 2, each spiral portion 21 is fixedly connected to multiple annular structural reinforcement 3s, further improving the uniformity of the spiral portion 21 and enhancing the constraint effect of the spiral reinforcement 2 on the core concrete 53. The number of annular structural reinforcement 3s is preferably even (e.g., four or six), and the even number of annular structural reinforcement 3s are symmetrically arranged in both the axial and radial directions of the shield tunnel segment, facilitating uniform stress distribution on the annular structural reinforcement 3s.
[0043] In this embodiment, the shield tunnel segments have spiral reinforcement bars 2 embedded in the concrete 5 of the segments. The spiral reinforcement bars 2 constrain the core concrete 53 within the annular steel cage 1, further improving the load-bearing capacity of the shield tunnel segments. Therefore, when designing shield tunnel segments, the thickness of the segments can be reduced accordingly while meeting the load-bearing capacity requirements, thereby reducing material usage, improving material utilization, and lowering production costs. In addition, reducing the thickness of the shield tunnel segments can also reduce the amount of excavation required for the inclined shaft roadway in the coal mine during construction, thus improving construction efficiency.
[0044] In this embodiment, the annular structural reinforcement 3 is formed by bending steel bars. In other embodiments, the annular structural reinforcement 3 can also be an arc-shaped steel pipe. This further reduces the weight of the shield tunnel segment and lowers the overall cost. Multiple annular structural reinforcement 3 are arranged on the inner or outer side of the spiral reinforcement 2. In this embodiment, all annular structural reinforcement 3 are arranged on the inner side of the spiral reinforcement 2. Multiple annular structural reinforcement 3 can be fixedly connected to the spiral reinforcement 2, thereby forming an integral reinforced structure. Furthermore, the multiple annular structural reinforcement 3 can position the spiral reinforcement 2 and adjust the size of the gaps on the spiral reinforcement 2. When designing reinforced concrete shield tunnel segments, spiral reinforcement is installed inside at least part of the closed sub-cavities according to the load-bearing capacity requirements to improve material utilization and reduce segment production costs while meeting load-bearing capacity requirements.
[0045] The spiral reinforcement 2 includes a plurality of sequentially adjacent spiral portions 21. Before the spiral reinforcement 2 is placed inside the annular steel cage 1, the annular structural reinforcement 3 is fixedly connected to the spiral reinforcement 2 to adjust the length of the plurality of spiral portions 21 in the extension direction of the spiral reinforcement 2.
[0046] By using the above technical solution, fixing the annular structural reinforcement 3 to the spiral reinforcement 2 can control the extension length of each spiral part 21 and facilitate the positioning of the spiral reinforcement 2 by the workers using the annular structural reinforcement 3 before pouring the concrete 5. Before pouring the concrete 5, the workers position the two ends of the annular structural reinforcement 3 using the positioning component 4, thereby fixing the spiral reinforcement 2 fixed to the annular structural reinforcement 3, so that the spiral reinforcement 2 is suspended in the annular steel cage 1, thus enabling the spiral reinforcement 2 to restrain the core concrete 53. The positioning component 4 is made of a weldable material, such as iron or steel.
[0047] The spiral reinforcement 2 is fixedly set at the center of the closed sub-chamber, which can effectively reduce the influence of eccentric force on the cross-section of the sub-chamber. At the same time, it makes the thickness of the interlayer concrete 52 between the spiral reinforcement 2 and the annular steel cage 1 more uniform, thereby improving the constraint effect of the annular steel cage 1 on the interlayer concrete 52.
[0048] Please refer to Figure 6 Workers should prepare molds for the reinforced concrete shield tunnel segments in advance, place the tied reinforcing steel cage (ring steel cage 1, spiral reinforcement 2, ring structural reinforcement 3, positioning component 4) into the molds, leaving a certain distance between the reinforcing steel cage and each part of the mold, the distance being equal to the thickness of the protective concrete layer 51, and then pour concrete 5. Finally, the multiple prefabricated segments are fixedly connected with bolts to form a complete reinforced concrete shield tunnel segment.
[0049] It should be noted that before two circumferentially adjacent prefabricated tunnel segments are bonded together, sealant is applied to the bonding surface, and then bolts are used to circumferentially splice the two tunnel segments. By applying sealant to the joints of the tunnel segments, the possibility of seepage in the coal mine inclined shaft is reduced. It should also be noted that in this embodiment, the coal mine inclined shaft is assembled from tunnel segments with continuous joints; in other embodiments, the coal mine inclined shaft can also be assembled from tunnel segments with staggered joints.
[0050] This scheme embeds spiral reinforcement bars 2 within the concrete 5 of the annular reinforcing cage 1. The spiral reinforcement bars 2 constrain the core concrete 53 within the annular reinforcing cage 1, thereby increasing the strength of the core concrete 53 in the reinforced concrete shield tunnel segment in multiple directions, and thus improving the load-bearing capacity of the reinforced concrete shield tunnel segment. Therefore, when designing shield tunnel segments, while meeting the load-bearing capacity requirements, the thickness of the segments can be reduced accordingly, achieving the effects of reducing material usage, improving material utilization, and lowering production costs. In addition, reducing the thickness of the shield tunnel segments can also reduce the amount of excavation in the inclined shaft tunnel during construction, improving construction efficiency.
[0051] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0052] In the description of this application, "first feature" and "second feature" may include one or more of the features.
[0053] In the description of this application, "multiple" means two or more.
[0054] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.
[0055] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.
[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0057] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.
[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.
Claims
1. A reinforced concrete shield segment suitable for laser scanning recognition, characterized in that, It includes multiple prefabricated tunnel segment assemblies that are spliced and fixed along the circumferential direction, each of the prefabricated tunnel segment assemblies comprising: Annular steel cage (1), wherein the annular steel cage (1) is the structural skeleton of the precast segment assembly; Spiral reinforcement bars (2) and annular structural reinforcement bars (3), multiple sets of the spiral reinforcement bars (2) and annular structural reinforcement bars (3) extend circumferentially along the inside of the annular steel cage (1) and are axially spaced. The spiral reinforcement bars (2) and annular structural reinforcement bars (3) are adjacent to each other and are fixedly connected to the annular steel cage (1) by positioning members (4). Concrete (5), which includes protective concrete (51), interlayer concrete (52) and core concrete (53), the protective concrete (51) covering the outside of the annular reinforcing cage (1), the interlayer concrete (52) filling the space between the annular reinforcing cage (1) and the spiral reinforcing bar (2), and the core concrete (53) filling the space inside the spiral reinforcing bar (2).
2. The laser scanning identification suitable steel confined concrete shield segment according to claim 1, characterized in that, The annular steel cage (1) includes circumferential main bars (11), radial bars (12) and axial bars (13). The circumferential main bars (11) are distributed at intervals along the radial and axial directions of the pipe segment. The radial bars (12) are distributed at intervals along the circumferential and axial directions of the pipe segment. The axial bars (13) are distributed at intervals along the circumferential and radial directions of the pipe segment. The radial bars (12) and axial bars (13) form a rectangular frame, and multiple rectangular frames are connected in series along the circumferential direction through the circumferential main bars (11).
3. The laser scanning identification suitable steel confined concrete shield segment according to claim 2, characterized in that, The annular steel cage (1) has multiple closed sub-chambers inside. The cross-sectional structure of the closed sub-chamber is rectangular, and the spiral reinforcement (2) is fixedly set at the center of the closed sub-chamber.
4. The laser scanning identification suitable steel confined concrete shield segment according to claim 3, characterized in that, The spiral ribs (2) are distributed at intervals or sequentially within each closed sub-cavity.
5. The laser scanning identification applicable reinforced concrete shield segment according to claim 1, characterized in that, There are multiple annular structural ribs (3) adjacent to the spiral rib (2), and the multiple annular structural ribs (3) are located inside or outside the space defined by the spiral rib (2) and distributed circumferentially.
6. The laser scanning identification suitable steel confined concrete shield segment according to claim 1, characterized in that, The spiral reinforcement (2) and the annular structural reinforcement (3) are fixed by binding or welding.
7. The laser scanning identification applicable reinforced concrete shield segment according to claim 1, characterized in that, The annular structural reinforcement (3) is an arc-shaped steel pipe or steel bar.
8. The laser scanning identification suitable steel confined concrete shield segment according to claim 1, characterized in that, The precast segments are assembled with either through joints or staggered joints, and the mating surfaces of two adjacent precast segments are first coated with sealant before being fastened with bolts.
9. The laser scanning identification applicable reinforced concrete shield segment according to claim 1, characterized in that, The spiral reinforcement bar (2) is at least partially embedded in the core concrete (53).