Tensioning device and tunneling machine

Abstract

The application relates to the technical field of tunnel excavation, in particular to a bracing device and a tunneling machine. The bracing device comprises a bracing shield and multiple stabilizers. The bracing shield comprises a support ring plate and multiple partition plate assemblies. The multiple partition plate assemblies are arranged in an axial and annular array along the support ring plate and are sequentially embedded in the bracing shield to separate the bracing shield into multiple installation cavities. The stabilizers are one-to-one correspondingly installed in the installation cavities. The stabilizer comprises a support shoe assembly and a telescopic oil cylinder. The telescopic oil cylinder has a piston rod. The support shoe assembly slides relative to the support ring plate through the piston rod so that the support shoe assembly partially extends out of the installation cavity or slides into the installation cavity. The bracing device can shorten the time spent in mode conversion of the tunneling machine, reduce the workload and effectively improve the construction efficiency.

Description

Technical Field

[0001] This application relates to the field of tunnel boring technology, specifically a tensioning device and a tunnel boring machine. Background Technology

[0002] A tunnel boring machine (TBM) is a mechanical device used for tunnel excavation. It can cut, excavate, or drill holes in underground tunnels to create a required space or passage. In long-distance construction in complex strata, the differences in geological structure are very obvious. For complex working conditions involving alternating and transitional strata of soft soil, soft rock, and hard rock, TBMs with different excavation modes are needed to meet construction requirements.

[0003] In existing technologies, tunnel boring machines (TBMs) with both earth pressure monitoring and tunnel boring machine (TBM) modes are commonly used to adapt to different geological conditions. In TBM mode, the TBM's support shoes extend to tighten the tunnel walls; in earth pressure monitoring mode, the TBM's support shoes retract.

[0004] However, current dual-mode tunneling machines require an additional sealing structure in earth pressure mode, and the additional sealing structure needs to be removed when switching to TBM mode. The installation and removal of the sealing structure makes the tunneling machine's mode switching work more labor-intensive and time-consuming, thus affecting construction efficiency. Summary of the Invention

[0005] This application provides a tensioning device and a tunneling machine to solve the problem that current dual-mode tunneling machines require the installation or removal of sealing structures when switching modes, which results in a large workload and long time consumption during the mode switching process, thus affecting construction efficiency.

[0006] To achieve the above objectives, the technical solution of this application is as follows:

[0007] On one hand, the present application provides a tensioning device, including a tensioning shield and multiple stabilizers. The tensioning shield includes a support ring plate and multiple partition assemblies. The multiple partition assemblies are distributed in an axial and circumferential array along the support ring plate and are sequentially embedded in the tensioning shield to divide the tensioning shield into multiple mounting cavities. The stabilizers are installed in the mounting cavities one by one. The stabilizers include a support shoe assembly and a telescopic cylinder. The telescopic cylinder has a piston rod. The support shoe assembly slides relative to the support ring plate through the piston rod, so that the support shoe assembly partially extends out of the mounting cavity or slides into the mounting cavity.

[0008] In one possible implementation, the tensioning device provided in this application includes a partition assembly comprising a base plate and a plurality of first side plates, the plurality of first side plates being sequentially connected and fixedly connected to the inner wall of the tensioning shield, the base plate being sequentially fixedly connected to the same end of the plurality of first side plates facing the support ring plate; a support shoe assembly comprising a support shoe plate and a plurality of second side plates, the plurality of second side plates being sequentially connected and fixedly connected to the support shoe plate at one end away from the support ring plate; a gap exists between the first side plates and the second side plates, and the projection of the first side plate toward the second side plate and the projection of the second side plate toward the first side plate at least partially overlap.

[0009] In one possible implementation, the tensioning device provided in this application has an arc-shaped portion on the side of the support shoe plate facing away from the support ring plate.

[0010] In one possible implementation, the supporting device provided in this application has at least one slurry discharge hole on the base plate that communicates with the mounting cavity, and a plug is detachably installed on the slurry discharge hole.

[0011] In one possible implementation, the tensioning device provided in this application further includes a guide assembly and a first connector. The guide assembly includes a base and a guide column slidably connected to the base. The end of the base away from the first side plate is fixedly connected to the bottom plate. The end of the guide column facing the piston rod is fixedly connected to the piston rod through the first connector.

[0012] In one possible implementation, the supporting device provided in this application has a sealing groove at one end of the base facing the guide post, and a sealing element is provided in the sealing groove, with the sealing element abutting between the base and the guide post.

[0013] In one possible implementation, the tensioning device provided in this application further includes a damping component and a second connector. The damping component includes at least one buffer seat, which abuts against the support shoe plate and the guide post. The buffer seat is connected to the support shoe plate and the guide post through the second connector, and there is a gap between the buffer seat and the second connector.

[0014] In one possible implementation, the bracing device and vibration damping component provided in this application further include a compression spring, which compresses the middle of the buffer seat and abuts against the support shoe plate and the guide post.

[0015] In one possible implementation, the tensioning device provided in this application has each mounting cavity spaced apart in the middle and upper part of the tensioning shield.

[0016] On the other hand, this application also provides a tunneling machine, including a tunneling machine body and any of the aforementioned tensioning devices disposed on the tunneling machine body.

[0017] The tensioning device and tunneling machine provided in this application form an installation cavity within the tensioning shield by installing a baffle assembly inside the shield. This cavity is used to mount a stabilizer, and both the cavity and stabilizer are positioned along the periphery of the support ring plate. The stabilizer's operation does not occupy the space enclosed by the inner ring of the support ring plate, allowing the tensioning shield to provide a passage for workers. The stabilizer includes a support shoe assembly and a telescopic cylinder. The support shoe assembly tensions the rock wall, and the telescopic cylinder drives the support shoe assembly to extend out of or slide into the installation cavity. During operation, the support shoe assembly and the baffle assembly always form a closed space within the installation cavity, ensuring the tensioning shield remains sealed. This design eliminates the need for additional sealing structures or disassembly of existing ones, thereby reducing the time required for tunneling machine mode conversion, decreasing workload, and effectively improving construction efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the tensioning device provided in the embodiments of this application;

[0020] Figure 2 for Figure 1 Side sectional view;

[0021] Figure 3 for Figure 1 A magnified view of a section at point A in the middle;

[0022] Figure 4 for Figure 3 A structural diagram from another perspective.

[0023] Explanation of reference numerals in the attached figures:

[0024] 100: Tighten the shield;

[0025] 110: Support ring plate;

[0026] 120: Partition assembly;

[0027] 121: Base plate; 1211: Grout discharge hole; 1212: Plug;

[0028] 122: First side panel;

[0029] 200: Stabilizer;

[0030] 210: Boot support assembly;

[0031] 211: Supporting boot plate; 2111: Curved part;

[0032] 212: Second side panel;

[0033] 220: Telescopic hydraulic cylinder;

[0034] 221: Piston rod;

[0035] 230: Guiding component;

[0036] 231: Base;

[0037] 232: Guide post;

[0038] 233: Seals;

[0039] 240: First connector;

[0040] 250: Vibration damping components;

[0041] 251: Buffer seat;

[0042] 252: Compression spring;

[0043] 260: Second connector;

[0044] 300: First countersunk hole;

[0045] 310: First containment area;

[0046] 320: Second containment area;

[0047] 400: Second countersunk hole;

[0048] 410: Third containment area;

[0049] 420: Fourth containment area;

[0050] 430: Fifth containment area.

[0051] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the preferred embodiments of this application will be described in more detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0053] It should be noted that in the description of the embodiments of this application, the terms "upper", "lower", "inner", "outer" and other terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description, and do not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this application.

[0054] Furthermore, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0055] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] A tunnel boring machine (TBM) is a mechanical device used for tunnel excavation. It can cut, excavate, or drill holes in underground tunnels to create a required space or passage. In long-distance construction in complex strata, the differences in geological structure are very obvious. For complex working conditions involving alternating and transitional strata of soft soil, soft rock, and hard rock, TBMs with different excavation modes are needed to meet construction requirements.

[0057] In existing technologies, tunnel boring machines (TBMs) with both earth pressure monitoring and tunnel boring machine (TBM) modes are commonly used to adapt to different geological conditions. In TBM mode, the TBM's support shoes extend to tighten the tunnel walls; in earth pressure monitoring mode, the TBM's support shoes retract.

[0058] However, current dual-mode tunneling machines require an additional sealing structure in earth pressure mode, and the additional sealing structure needs to be removed when switching to TBM mode. The installation and removal of the sealing structure makes the tunneling machine's mode switching work more labor-intensive and time-consuming, thus affecting construction efficiency.

[0059] In view of this, the tensioning device and tunneling machine provided in this application form an installation cavity within the tensioning shield by installing a baffle assembly inside the tensioning shield. The installation cavity is used to install the stabilizer, and the installation cavity and stabilizer are arranged along the periphery of the support ring plate. The operation of the stabilizer does not occupy the space enclosed by the inner ring of the support ring plate, so that the tensioning shield can provide a passage for workers to operate and pass through. The stabilizer includes a support shoe assembly and a telescopic cylinder. The support shoe assembly is used to tension the rock wall, and the telescopic cylinder is used to drive the support shoe assembly to extend out of the installation cavity or slide into the installation cavity. During operation, the support shoe assembly and the baffle assembly always form a closed space within the installation cavity, so that the tensioning shield always remains sealed. This design eliminates the need to add or dismantle additional sealing structures, thereby shortening the time spent on tunneling machine mode conversion, reducing workload, and effectively improving construction efficiency.

[0060] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0061] Figure 1 This is a schematic diagram of the structure of the tensioning device provided in the embodiments of this application; Figure 2 for Figure 1 Side sectional view; Figure 3 for Figure 1 A magnified view of a section at point A in the middle; Figure 4 for Figure 3 A structural diagram from another perspective.

[0062] See Figures 1 to 4 This application provides a tensioning device, including a tensioning shield 100 and a plurality of stabilizers 200. The tensioning shield 100 includes a support ring plate 110 and a plurality of partition assemblies 120. The plurality of partition assemblies 120 are arranged in an axial and circumferential array along the support ring plate 110 and are sequentially embedded in the tensioning shield 100 to divide the tensioning shield 100 into a plurality of mounting cavities. The stabilizers 200 are installed in the mounting cavities one by one. The stabilizers 200 include a support shoe assembly 210 and a telescopic cylinder 220. The telescopic cylinder 220 has a piston rod 221. The support shoe assembly 210 slides relative to the support ring plate 110 through the piston rod 221, so that the support shoe assembly 210 partially extends out of the mounting cavity or slides into the mounting cavity.

[0063] In this application, each partition assembly 120 is arranged in an axial and circumferential array along the support ring plate 110 and is spaced apart and embedded within the tension shield 100 to form a mounting cavity within the tension shield 100. The mounting cavity is used to install the stabilizer 200. The mounting cavity and the stabilizer 200 are arranged along the periphery of the support ring plate 110. The operation of the stabilizer 200 does not occupy the space enclosed by the inner ring of the support ring plate 110, allowing the tension shield 100 to provide a passage for workers' operations and passage, without affecting the installation of other components, thus improving practicality and convenience.

[0064] It is understood that the number of partition assembly 120 and stabilizer 200 is given only as an example, and the specific number can be set according to actual needs. This embodiment does not limit the number of numbers.

[0065] The installation cavities are spaced apart, allowing the support shoe assembly 210 to partially extend out of the installation cavity in TBM mode to maintain contact with the tunnel wall and surrounding rock. Together with the bottom area of ​​the tension shield 100, they form multi-point support, improving the stability of the tension shield 100 and providing the force and torque required during tunneling. Compared to traditional double-support shoe tension shields, this application increases the contact points and effective contact area between the support shoe assembly 210 and the tunnel wall, transforming the support force originally concentrated on the left and right support shoes into support force acting at multiple locations. This results in a more uniform stress and strain on the contact surface between the support shoe assembly 210 and the surrounding rock.

[0066] Each support shoe assembly 210 is evenly and tightly supported against the excavated tunnel wall. The distributed support force and ground pressure (the vertical load borne per unit area of ​​contact between the support shoe assembly 210 and the surrounding rock) of each support shoe assembly 210 can be adjusted according to the actual contact conditions with the surrounding rock. This solves the problems of incomplete contact between the support shoe assembly 210 and the surrounding rock and poor support stability, while avoiding concentrated loads that could damage the tunnel wall and preventing excessive local support force from crushing weak surrounding rock. When facing soft rock, fault fracture zones, or other unstable surrounding rock areas, the stroke and hydraulic pressure of each telescopic cylinder 220 can be independently adjusted according to the actual surrounding rock conditions faced by each support shoe assembly 210 to provide appropriate support force, ensuring sufficient contact between the support shoe assembly 210 and the surrounding rock to generate sufficient friction to meet tunneling requirements. When encountering areas where support is insufficient, the friction generated between the stabilizers 200 in other areas and the tunnel wall allows for smooth passage, effectively reducing the adverse effects of poor geological conditions on tunneling.

[0067] In practice, the stroke and oil pressure data of each telescopic cylinder 220 can be collected by an industrial control computer to establish a relationship diagram between the position of the tension shield 100 and the gap and pressure of the surrounding rock, so as to determine the convergence and deformation of the surrounding rock near the tension shield 100 and the working status of the stabilizer 200, and provide data support for subsequent safe and smooth tunneling.

[0068] In the event of a small-scale tunnel wall collapse during the excavation process, the support shoe assembly 210 located at the collapse site can be retracted into the installation cavity using the telescopic rod 221. This ensures that the outer shell of the support shield 100 has a complete protective structure, allowing the rock debris to slide to the bottom of the tunnel without accumulating at the protruding part of the support shoe assembly 210, thus effectively improving construction safety.

[0069] Understandably, during operation, the support shoe assembly 210 and the partition assembly 120 always form a closed space within the installation cavity, isolating the interior of the support shield 100 from the external environment. This achieves sealing and pressure maintenance simultaneously in both Earth Pressure Monitoring System (EPS) and TBM modes, meeting the operational requirements of both modes. Therefore, there is no need to add or dismantle any additional sealing structures, shortening the time spent on TBM mode switching, reducing workload, effectively improving construction efficiency, and simultaneously enhancing geological adaptability and safety.

[0070] See Figures 1 to 4 In this embodiment of the application, the partition assembly 120 includes a bottom plate 121 and a plurality of first side plates 122, which are sequentially connected and fixed to the inner sidewall of the support shield 100. The bottom plate 121 and the plurality of first side plates 122 are sequentially fixed to the same end facing the support ring plate 110. The support shoe assembly 210 includes a support shoe plate 211 and a plurality of second side plates 212, which are sequentially connected and fixed to the support shoe plate 211 at one end away from the support ring plate 110. There is a gap between the first side plate 122 and the second side plate 212, and the projection of the first side plate 122 toward the second side plate 212 and the projection of the second side plate 212 toward the first side plate 122 at least partially overlap.

[0071] In practice, multiple first side plates 122 are sequentially connected to form a closed enclosure structure, and the bottom plate 121 is sequentially fixed to the same end of the multiple first side plates 122 facing the support ring plate 110. Thus, the partition assembly 120 forms an installation cavity within the tension shield 100 for installing the stabilizer 200.

[0072] The first side plate 122 is fixedly connected to the inner wall of the support shield 100, which enhances the structural stability of the support shield 100. At the same time, the mutual support between the multiple first side plates 122 also improves the structural stability of the partition assembly 120.

[0073] In some embodiments, the support shoe plate 211 is used to brace the rock wall, and the support shoe plate 211 has a large contact area, which helps to disperse the pressure acting on the support shoe plate 211, reduce local stress concentration, and thus avoid damage and wear.

[0074] It is understood that the support shoe plate 211 and each of the second side plates 212 can be connected by welding, or the support shoe plate 211 and each of the second side plates 212 can be integrally formed; this embodiment does not impose any limitations on this. The support shoe plate 211 and each of the second side plates 212 form a sleeve structure, and the finished support shoe assembly 210 is installed as a whole in the mounting cavity. This improves the ease of installation, and at the same time, the support shoe assembly 210 can be completely disassembled during disassembly, improving work efficiency.

[0075] The number of the first side plate 122 and the second side plate 212 is given only as an example, and the specific number can be set according to actual needs. This embodiment does not limit the number of the number of the first side plate 122 and the second side plate 212.

[0076] In this application, in order to better support the surrounding rock with the support shoe plate 211, the support shoe assembly 210 has a certain degree of adjustability. That is, the distance and angle of the support shoe assembly 210 extending out of the installation cavity can be adjusted according to the actual contact with the surrounding rock of the tunnel wall. Therefore, there is a gap between the first side plate 122 and the second side plate 212 to ensure that the support shoe assembly 210 can extend and retract smoothly during operation and avoid jamming.

[0077] In practice, in order to isolate the interior of the support shield 100 from the external environment and achieve sealing and pressure maintenance under both earth pressure and TBM modes, the support shoe assembly 210 can only extend partially out of the mounting cavity. That is, the projection of the first side plate 122 toward the second side plate 212 and the projection of the second side plate 212 toward the first side plate 122 at least partially overlap. Thus, an overlapping area is formed between the first side plate 122 and the second side plate 212, thereby isolating the interior of the support shield 100 from the external environment.

[0078] See Figure 3 In this embodiment of the application, the side of the support shoe plate 211 facing away from the support ring plate 110 has an arc-shaped portion 2111.

[0079] In practice, the radius of the arc surface of the arc-shaped part 2111 is equal to the radius of the tunnel excavation. As a result, the support shoe plate 211 can better adapt to different geological conditions, increase the contact area between the support shoe plate 211 and the surrounding rock of the tunnel wall, reduce the ground pressure, improve the support stability of the support shoe plate 211, and reduce damage to the surrounding rock.

[0080] See Figure 4 In this embodiment of the application, the base plate 121 is provided with at least one slurry discharge hole 1211 communicating with the mounting cavity, and a plug 1212 is detachably installed on the slurry discharge hole 1211.

[0081] In some embodiments, clean water can be injected into the installation cavity through the slurry drain hole 1211 to flush away residual mud, sand and stone chips in the installation cavity.

[0082] Understandably, the plug 1212 is a removable mounting component used to seal the slurry discharge hole 1211 when needed. When it is not necessary to clean the residual mud, sand, and stone chips in the mounting cavity, the plug 1212 can be installed to seal the slurry discharge hole 1211, ensuring the seal within the mounting cavity.

[0083] See Figure 3 and Figure 4 In this embodiment of the application, the stabilizer 200 further includes a guide assembly 230 and a first connector 240. The guide assembly 230 includes a base 231 and a guide post 232 slidably connected to the base 231. The base 231 is fixedly connected to the end of the base plate 121 away from the first side plate 122. The end of the guide post 232 facing the piston rod 221 is fixedly connected to the piston rod 221 through the first connector 240.

[0084] The base 231 can be used as the mounting base for the telescopic cylinder 220. The base 231 can be fixed to the base plate 121 by welding. It has wide welding adaptability and good connection performance.

[0085] In this application, a guide post 232 is slidably connected within the base 231. To connect the guide post 232 to the piston rod 221, a first connector 240 and a first countersunk hole 300 are provided. The first connector 240 and the first countersunk hole 300 are provided in a one-to-one correspondence. The first connector 240 can be a screw. The first countersunk hole 300 includes a first receiving area 310 and a second receiving area 320. The first receiving area 310 is located on the guide post 232, and the second receiving area 320 is located on the piston rod 221. The screw passes through the first receiving area 310 and the second receiving area 320 in sequence to connect the guide post 232 and the piston rod 221. The design of the first countersunk hole 300 allows the head of the screw to be flush with or slightly lower than the surface of the guide post 232, thereby achieving aesthetics, reducing the adverse effects caused by protrusions, and protecting the screw head from damage.

[0086] Understandably, the guide column 232 can only move axially to transmit the action of the compression cylinder 220 to the support shoe assembly 210.

[0087] See Figure 3 and Figure 4 In this embodiment, a sealing groove is provided at one end of the base 231 facing the guide post 232, and a sealing element 233 is provided in the sealing groove, which abuts against the base 231 and the guide post 232.

[0088] In some embodiments, a seal 233 is abutted between the base 231 and the guide post 232. The seal 233 can effectively prevent mud and gravel from entering the base 231 through the gap between the base 231 and the guide post 232, thereby effectively avoiding the adverse effects of mud and gravel on the operation of the stabilizer 200.

[0089] See Figure 3 and Figure 4 In this embodiment of the application, the stabilizer 200 further includes a vibration damping component 250 and a second connector 260. The vibration damping component 250 includes at least one buffer seat 251, which abuts against the support shoe plate 211 and the guide post 232. The buffer seat 251 is connected to the support shoe plate 211 and the guide post 232 through the second connector 260, and there is a gap between the buffer seat 251 and the second connector 260.

[0090] The buffer seat 251 abuts between the support shoe plate 211 and the guide post 232. The buffer seat 251 can be made of rubber or other composite materials. Any material with good buffering performance and high fatigue strength is acceptable. This embodiment does not impose any restrictions. The purpose is to reduce the vibration and impact generated when the support shoe plate 211 contacts the hole wall.

[0091] When the support shoe plate 211 comes into contact with the surrounding rock, the support shoe plate 211 may need to offset or swing relative to the telescopic cylinder 220 to better contact the surrounding rock. There is a gap between the buffer seat 251 and the second connecting member 260. Thus, the buffer seat 251 can be finely adjusted to allow the support shoe plate 211 to have a certain range of displacement and angular swing in the axial or radial direction, so as to adapt to the contact between the support shoe plate 211 and the uneven rock wall, reduce the damage to the surrounding rock, and at the same time avoid the support shoe assembly 210 from getting stuck when it extends and retracts.

[0092] In specific implementation, to connect the buffer seat 251 with the support shoe plate 211 and the guide post 232, a second connector 260 and a second countersunk hole 400 are provided. The second connector 260 and the second countersunk hole 400 are provided in a one-to-one correspondence. The second connector 260 can be a screw. The second countersunk hole 400 includes a third receiving area 410, a fourth receiving area 420, and a fifth receiving area 430 arranged sequentially. The third receiving area 410 is located on the support shoe plate 211, the fourth receiving area 420 is located on the buffer seat 251, and the fifth receiving area 430 is located on the guide post 232. The screw passes through the third receiving area 410, the fourth receiving area 420, and the fifth receiving area 430 in sequence to connect the buffer seat 251 with the support shoe plate 211 and the guide post 232. It can be understood that the design of the second countersunk hole 400 makes the head of the screw flush with or slightly lower than the surface of the support shoe plate 211, achieving aesthetics while avoiding any protrusions that could adversely affect the use of the support shoe plate 211.

[0093] See Figure 3 and Figure 4 In this embodiment of the application, the vibration damping component 250 further includes a compression spring 252, which compresses the middle part of the buffer seat 251 and abuts against the support shoe plate 211 and the guide post 232.

[0094] In some embodiments, the compression spring 252 can further reduce the vibration and impact on the support shoe assembly 210 and ensure that the second connector 260 for mounting the support shoe plate 211 is always in close contact with the support shoe plate 211, thus preventing loosening and loss of fastening effect due to excessive vibration.

[0095] See Figure 1 and Figure 2 In this embodiment of the application, each mounting cavity is spaced apart at the middle and upper part of the support shield 100.

[0096] In practice, each mounting cavity is symmetrically arranged along the circumferential direction of the support ring plate 110 and is located in the middle and upper part of the tension shield 100 respectively. The stabilizer 200 installed in the mounting cavity can better disperse and bear the reaction force and torque generated by the cutter head cutting the rock and soil. At the same time, together with the bottom area of ​​the tension shield 100, it forms a multi-point support structure to improve the stability of the tension shield 100.

[0097] This application also provides a tunneling machine, including a tunneling machine body and a tensioning device as described in any of the above embodiments, disposed on the tunneling machine body. The structure and working principle of the tensioning device have been described in detail in the above embodiments and will not be repeated here.

[0098] Therefore, by adopting the tensioning device provided in the embodiments of this application, the tunneling efficiency of the tunneling machine can be effectively improved.

[0099] In summary, the tensioning device and tunneling machine provided in this application form an installation cavity within the tensioning shield 100 by providing a partition assembly 120 inside the tensioning shield 100. The installation cavity is used to install the stabilizer 200, and the installation cavity and the stabilizer 200 are arranged along the periphery of the support ring plate 110. The operation of the stabilizer 200 does not occupy the space enclosed by the inner ring of the support ring plate 110, so that the tensioning shield 100 can provide a passage for workers to work and pass through. The stabilizer 200 includes a support shoe assembly 210 and a telescopic cylinder 220. The support shoe assembly 210 is used to support the rock wall, and the telescopic cylinder 220 is used to drive the support shoe assembly 210 to extend out of the mounting cavity or slide into the mounting cavity. During operation, the support shoe assembly 210 always forms a closed space with the partition assembly 120 in the mounting cavity, so that the support shield 100 is always kept in a sealed state. With this design, there is no need to add a sealing structure or disassemble an added sealing structure, thereby shortening the time spent on the tunneling machine mode conversion, reducing the workload, and effectively improving construction efficiency.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A tensioning device, characterized in that, The device includes a support shield (100) and multiple stabilizers (200). The support shield (100) includes a support ring plate (110) and multiple partition assemblies (120). The multiple partition assemblies (120) are arranged in an axial and circumferential array along the support ring plate (110) and are sequentially embedded in the support shield (100) to divide the support shield (100) into multiple mounting cavities. The stabilizers (200) are installed in the mounting cavities one by one. The stabilizer (200) includes a support shoe assembly (210) and a telescopic cylinder (220), the telescopic cylinder (220) having a piston rod (221), the support shoe assembly (210) sliding relative to the support ring plate (110) via the piston rod (221) to allow the support shoe assembly (210) to partially extend out of the mounting cavity or slide into the mounting cavity; The partition assembly (120) includes a base plate (121) and a plurality of first side plates (122), the plurality of first side plates (122) are sequentially connected and fixed to the inner side wall of the support shield (100), and the base plate (121) and the plurality of first side plates (122) are sequentially fixed to the same end facing the support ring plate (110); The support boot assembly (210) includes a support boot plate (211) and a plurality of second side plates (212), the plurality of second side plates (212) are sequentially connected, and one end of the second side plates (212) facing away from the support ring plate (110) is fixedly connected to the support boot plate (211); There is a gap between the first side plate (122) and the second side plate (212), and the projection of the first side plate (122) toward the second side plate (212) at least partially overlaps with the projection of the second side plate (212) toward the first side plate (122); The base plate (121) is provided with at least one slurry discharge hole (1211) communicating with the mounting cavity, and a plug (1212) is detachably installed on the slurry discharge hole (1211).

2. The tensioning device according to claim 1, characterized in that, The side of the support boot plate (211) facing away from the support ring plate (110) has an arc-shaped portion (2111).

3. The tensioning device according to claim 2, characterized in that, The stabilizer (200) further includes a guide assembly (230) and a first connector (240). The guide assembly (230) includes a base (231) and a guide post (232) slidably connected to the base (231). The base (231) is fixedly connected to one end of the base plate (121) away from the first side plate (122). The end of the guide post (232) facing the piston rod (221) is fixedly connected to the piston rod (221) through the first connector (240).

4. The tensioning device according to claim 3, characterized in that, The base (231) has a sealing groove at one end facing the guide post (232), and a sealing element (233) is provided in the sealing groove. The sealing element (233) abuts between the base (231) and the guide post (232).

5. The tensioning device according to claim 4, characterized in that, The stabilizer (200) further includes a damping component (250) and a second connector (260). The damping component (250) includes at least one buffer seat (251) that abuts against the support shoe plate (211) and the guide post (232). The buffer seat (251) is connected to the support shoe plate (211) and the guide post (232) via the second connector (260). There is a gap between the buffer seat (251) and the second connector (260).

6. The tensioning device according to claim 5, characterized in that, The vibration damping assembly (250) also includes a compression spring (252) that compresses the middle of the buffer seat (251) and abuts against the support shoe plate (211) and the guide post (232).

7. The tensioning device according to claim 2, characterized in that, Each of the mounting cavities is spaced apart at the middle and upper part of the support shield (100).

8. A tunneling machine, characterized in that, It includes a tunneling machine body and a tensioning device as described in any one of claims 1 to 7, which is disposed on the tunneling machine body.

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