Shield tunneling machine excavation subway connecting passage shield segment limiting device and method

Abstract

The application discloses a shield tunneling machine excavation subway connecting passage shield segment limiting device and method, relates to the technical field of shield tunneling machine, and the device comprises a shield tunneling machine starting sleeve; a shield segment is connected to the inside of the shield tunneling machine starting sleeve through a limiting mechanism; the limiting mechanism comprises a hydraulic thrust assembly installed on the outside of the shield tunneling machine starting sleeve; the top end of the hydraulic thrust assembly is provided with a limiting assembly; and the inside of the limiting assembly is provided with a guide assembly. The hydraulic thrust assembly is arranged, the limiting assembly is controlled through a hydraulic oil cylinder, the accurate control of shield segment displacement is realized in the process of shield excavation transverse connecting passage segment assembly, the combination effect between the components in the limiting mechanism is improved, the control precision of the shield segment during displacement is ensured, pre-tightening force can be applied to the shield segment before the shield tunneling machine advancing oil cylinder is retracted, and the problem that the shield tunneling machine advancing oil cylinder retraction influences the pressure of a working face in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of tunnel boring machine (TBM) technology, and more specifically, to a device and method for limiting the positioning of TBM segments when excavating subway connecting passages. Background Technology

[0002] Mechanical excavation of shield tunnel connecting passages is a new construction technology that uses pipe jacking or shield tunneling to construct shield tunnel connecting passages. It is applicable to various geological environments, including soft soil, fine sand, water-rich sand and gravel, weathered rock strata, and composite strata. Compared with the traditional freezing method, it effectively shortens the construction period, has a fast construction speed, high safety, and small environmental impact, and has significant economic benefits and social value.

[0003] When using mechanical methods to excavate the connecting passage of a shield tunnel, after each ring of tunnel segments is advanced, the displacement of the shield segment limit holes must first be restricted by pins to control the backward movement of the shield segment. Then, the propulsion cylinder is retracted to assemble the next ring of tunnel segments.

[0004] However, the connecting passages are generally short, and the forces between the strata and the tunnel segments cannot completely resist the reaction force of the shield cutterhead rotation during excavation. The shield segments will rotate around their own axis under the influence of the reaction force. However, the existing technology cannot adjust the position of the device, so the existing device needs to be re-welded and repositioned in the actual construction process, which will cause great delays in the project progress and thus fail to meet the requirements of fast and efficient construction, thus slowing down the construction progress.

[0005] Furthermore, when excavating connecting passages using mechanical methods, the tunnel boring machine (TBM) will adjust its excavation angle according to the preset route, which will cause the limiting holes on the TBM segments to shift, making it impossible for the existing devices to be in place and affecting the construction progress. At the same time, the existing devices cannot provide pre-tensioning force, and when the TBM's propulsion cylinder retracts, the TBM segments are at risk of retraction under the pressure of the ground at the tunnel face.

[0006] No effective solutions have yet been proposed to address the problems in the relevant technologies. Summary of the Invention

[0007] In response to the problems in related technologies, this invention proposes a shield segment limiting device and method for tunnel boring machines excavating subway connecting passages, in order to overcome the aforementioned technical problems existing in the existing related technologies.

[0008] Therefore, the specific technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a shield segment limiting device for tunnel boring machines (TBMs) excavating subway connecting passages, including a TBM launching sleeve. The TBM launching sleeve is connected to a shield segment through a limiting mechanism. The limiting mechanism includes a hydraulic jacking assembly installed on the outside of the TBM launching sleeve. A limiting component is provided at the top of the hydraulic jacking assembly, and a guide component is provided inside the limiting component.

[0009] Furthermore, in order to achieve precise control of the displacement of the shield tunnel segments during the assembly of the transverse connecting passage segments during shield excavation by controlling the limit assembly with hydraulic cylinders, the connection effect between the various components within the limit mechanism is improved, ensuring the control accuracy of the shield tunnel segments during displacement. At the same time, it can apply pre-tensioning force to the shield tunnel segments before the shield machine's propulsion cylinder retracts, solving the problem of the impact on the face pressure caused by the retraction of the shield machine's propulsion cylinder in the existing technology. The hydraulic jacking assembly includes two sets of fixing pins installed on both sides of the shield machine's starting sleeve. Hydraulic cylinders are set on the outer side of both sets of fixing pins, and hydraulic cylinder fixing pins are connected to the top of the hydraulic cylinders.

[0010] Furthermore, in order to adjust the angle of the irregularly shaped limiting pin along the tangential direction by means of the sliding limiting block, so as to adapt to the shield segment limiting hole at different angles, and to solve the problem of displacement of the shield segment limiting hole caused by the rotation torque of the shield machine cutterhead, etc., and to achieve the purpose of freely limiting the shield segment at multiple angles, the limiting component includes sliding limiting blocks installed at both ends of the outer side of the shield machine starting sleeve. One side of the sliding limiting block is provided with a guide rail sliding groove, and the inside of the sliding limiting block is provided with an irregularly shaped limiting pin sliding groove. The hydraulic cylinder fixing pin is connected to the sliding limiting block through supports installed on both sides of the sliding limiting block, and the inside of the supports is provided with a sliding limiting block connecting hole. The limiting component also includes shield segment limiting holes opened inside the shield segment, and irregularly shaped limiting pins are provided inside the shield segment limiting holes.

[0011] Furthermore, in order to enable the circular end of the irregular-shaped limiting pin to connect with the shield segment limiting hole, and the square end to move within the irregular-shaped limiting pin sliding groove, thus solving the problem of limiting the shield segment at different angles, the irregular-shaped limiting pin includes a circular end installed inside the shield segment limiting hole and a square end installed inside the irregular-shaped limiting pin sliding groove, and the irregular-shaped limiting pin sliding groove has a square structure.

[0012] Furthermore, in order to provide guidance for the limiting component and ensure that the sliding limiting block can slide on the guide rail, the guiding component includes two sets of guide rails symmetrically installed on the outside of the shield machine's starting sleeve, and the guide rails are connected to the guide rail sliding grooves, and the guide rail sliding grooves have a convex structure.

[0013] Furthermore, in order to ensure that the irregularly shaped limiting pin can be smoothly inserted into the limiting hole of the shield segment when the axis of the shield segment and the axis of the shield machine are misaligned, the diameter of the circular end of the irregularly shaped limiting pin is 2mm different from the diameter of the limiting hole of the shield segment, and the size of the square end of the irregularly shaped limiting pin is 2mm different from the size of the sliding groove of the irregularly shaped limiting pin; the guide rail, the irregularly shaped limiting pin, the sliding limiting block and the hydraulic cylinder fixing pin are all made of steel.

[0014] Secondly, the present invention also provides a method for limiting the positioning of tunnel segments during the excavation of subway connecting passages by a tunnel boring machine, the method comprising the following steps: S1. Install a hydraulic jacking assembly on the outside of the tunnel boring machine, and determine the installation positions of the guide assembly and the limiting assembly based on the hydraulic jacking assembly. S2. Based on the working state of the radial adjustment hydraulic jacking assembly of the shield tunnel segment, drive the limiting assembly to restrict the shield tunnel segment; S3. Use the limiting effect to perform the assembly operation of the shield tunnel segments, and after the assembly is completed, readjust the working state of the hydraulic jacking component to release the limiting effect on the shield tunnel segments.

[0015] Furthermore, installing a hydraulic jacking assembly on the outside of the tunnel boring machine, and determining the installation positions of the guide assembly and the limiting assembly based on the hydraulic jacking assembly, includes the following steps: S11. Two sets of fixing pins are installed on the outer side of the shield machine starting sleeve using electric welding, and hydraulic cylinders are respectively installed on the outer side of the two sets of fixing pins. S12. Select a parallel area between the two sets of hydraulic cylinders and install two sets of guide rails, and set a sliding limit block between the two sets of guide rails; S13. Add hydraulic oil to the inside of the hydraulic cylinder and connect it to both ends of the sliding limit block. Use the working performance of the hydraulic cylinder to pull the sliding limit block and determine whether the sliding limit block can slide normally on the outside of the guide rail. S14. If the sliding limit block can slide normally on the outside of the guide rail, then determine the installation position of the hydraulic cylinder, guide rail and sliding limit block. If the sliding limit block cannot slide normally on the outside of the guide rail, then adjust the installation position of the two sets of guide rails.

[0016] Furthermore, based on the working state of the radial adjustment hydraulic jacking assembly of the tunnel boring machine segments, the driving limiting assembly to restrict the tunnel boring machine segments includes the following steps: S21. After the tunnel segment is advanced into place under the action of the tunnel boring machine, adjust the stroke of the hydraulic cylinder to drive the sliding limit block to move towards the tunnel segment, and align the sliding groove of the special-shaped limit pin at the sliding limit block with the limit hole of the tunnel segment. S22. With the assistance of the sliding groove of the special-shaped limit pin, insert the special-shaped limit pin into the inside of the shield segment limit hole, and determine whether the axis of the special-shaped limit pin coincides with the radial direction of the shield segment. S23. If the axis of the irregular-shaped limiting pin coincides with the radial direction of the shield segment, then proceed to step S24. If the axis of the irregular-shaped limiting pin does not coincide with the radial direction of the shield segment, then return to step S22 to readjust the angle of the irregular-shaped limiting pin. S24. Adjust the hydraulic cylinder to the retracted state to pull the sliding limit block to move, and use the special-shaped limit pin and the shield segment limit hole to restrict the shield segment.

[0017] The beneficial effects of this invention are as follows: 1. This invention achieves precise control of shield segment displacement during the assembly of transverse connecting passage segments in shield tunneling by setting up a hydraulic jacking component and controlling the limiting component with a hydraulic cylinder. This improves the connection effect between the various components in the limiting mechanism, ensures the control accuracy of the shield segments during displacement, and can apply pre-tensioning force to the shield segments before the shield machine's propulsion cylinder retracts, thus solving the problem in the prior art where the retraction of the shield machine's propulsion cylinder affects the pressure on the tunnel face.

[0018] 2. This invention, by setting a limiting component and a guiding component, allows the angle of the irregularly shaped limiting pin along the tangential direction to be adjusted by sliding the limiting block, so as to adapt to the shield segment limiting hole at different angles. This solves the problem of the shield segment limiting hole being displaced due to the rotation torque of the shield machine cutterhead, etc., and achieves the purpose of freely limiting the shield segment at multiple angles. At the same time, the guide rail can provide a guiding function for the limiting component, ensuring that the sliding limiting block can slide on the guide rail. Attached Figure Description

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

[0020] Figure 1 This is a schematic diagram of a shield segment limiting device for tunnel boring machines excavating subway connecting passages according to an embodiment of the present invention; Figure 2 This is a front view assembly drawing of a shield tunnel segment limiting device for excavating a subway connecting passage according to an embodiment of the present invention; Figure 3 This is a side view assembly diagram of a shield tunnel segment limiting device for excavating a subway connecting passage according to an embodiment of the present invention; Figure 4This is a top view assembly diagram of a shield tunnel segment limiting device for excavating a subway connecting passage according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the sliding limit block in a shield tunnel segment limiting device for excavating a subway connecting passage according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the irregularly shaped limiting pin component in a shield tunnel segment limiting device for excavating a subway connecting passage according to an embodiment of the present invention; Figure 7 This is a flowchart of a method for limiting the position of tunnel segments when excavating a subway connecting passage using a tunnel boring machine, according to an embodiment of the present invention.

[0021] In the picture: 1. Fixed pin; 2. Hydraulic cylinder; 3. Guide rail; 4. Irregularly shaped limit pin; 5. Sliding limit block; 6. Shield segment limit hole; 7. Shield machine launching sleeve; 8. Shield segment; 9. Hydraulic cylinder fixed pin; 10. Irregularly shaped limit pin sliding groove; 11. Guide rail sliding groove; 12. Sliding limit block connecting hole; 13. Irregularly shaped limit pin square end; 14. Irregularly shaped limit pin round end; 15. Support. Detailed Implementation

[0022] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0023] According to an embodiment of the present invention, a shield segment limiting device and method for tunnel boring machines excavating subway connecting passages are provided.

[0024] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figures 1-6 As shown, according to an embodiment of the present invention, a shield tunneling segment limiting device for excavating a subway connecting passage by a tunnel boring machine is provided, including a shield tunneling machine launching sleeve 7. The shield tunneling segment 8 is connected to the inside of the shield tunneling machine launching sleeve 7 through a limiting mechanism. The limiting mechanism includes a hydraulic jacking assembly installed on the outside of the shield tunneling machine launching sleeve. A limiting component is provided at the top of the hydraulic jacking assembly, and a guide component is provided inside the limiting component.

[0025] By using the above technical solution, the combination of various components of the limiting mechanism is realized by using a hydraulic jacking assembly. The displacement of the shield segment 8 is precisely controlled by controlling the limiting assembly through the hydraulic jacking assembly.

[0026] In one embodiment, the hydraulic jacking assembly includes two sets of fixing pins 1 installed on both sides of the shield machine launching sleeve 7. A hydraulic cylinder 2 is installed on the outer side of each of the two sets of fixing pins 1. A hydraulic cylinder fixing pin 9 is connected to the top of each hydraulic cylinder 2. This allows for precise control of the displacement of the shield segment 8 during the assembly of the transverse connecting passage segments during shield excavation, thereby improving the connection effect between the various components within the limiting mechanism and ensuring the control accuracy of the shield segment 8 during displacement. Simultaneously, it can apply pre-tensioning force to the shield segment 8 before the shield machine's propulsion cylinder retracts, solving the problem in the prior art where the retraction of the shield machine's propulsion cylinder affects the pressure at the tunnel face.

[0027] In one embodiment, the limiting component includes sliding limiting blocks 5 installed at both ends of the outer side of the tunnel boring machine's starting sleeve 7. A guide rail sliding groove 11 is provided on one side of the sliding limiting block 5, and a special-shaped limiting pin sliding groove 10 is provided inside the sliding limiting block 5. A hydraulic cylinder fixing pin 9 is connected to the sliding limiting block 5 via supports 15 installed on both sides of the sliding limiting block 5, and a sliding limiting block connecting hole 12 is provided inside the supports 15. The limiting component also includes a tunnel segment limiting hole 6 opened inside the tunnel segment 8. A special-shaped limiting pin 4 is provided inside the tunnel segment limiting hole 6, allowing the angle of the special-shaped limiting pin 4 along the tangential direction to be adjusted via the sliding limiting block 5. This adapts to different angles of the tunnel segment limiting hole 6, solving the problem of displacement of the tunnel segment limiting hole 6 due to the rotational torque of the tunnel boring machine cutterhead, and achieving the purpose of freely limiting the tunnel segment 8 at multiple angles.

[0028] In one embodiment, the irregular-shaped limiting pin 4 includes a circular end 14 installed inside the shield segment limiting hole 6 and a square end 13 installed inside the irregular-shaped limiting pin sliding groove 10. The irregular-shaped limiting pin sliding groove 10 has a square structure, so that the circular end of the irregular-shaped limiting pin 4 can be connected to the shield segment limiting hole 6, and the square end can move within the irregular-shaped limiting pin sliding groove 10, thus solving the problem of limiting the angle of different shield segments 8.

[0029] In one embodiment, the guide component includes two sets of guide rails 3 symmetrically installed on the outside of the shield machine launching sleeve 7, and the guide rails 3 are connected to the guide rail sliding grooves 11. The guide rail sliding grooves 11 have a convex structure, which can provide a guiding function for the limiting component and ensure that the sliding limiting block 5 can slide on the guide rails 3.

[0030] Specifically, each guide assembly consists of two sets of guide rails 3. A sliding limit block 5 is installed on the secondary guide rail 3 and can slide along the guide rail 3 in a single direction. The guide rail 3 is also the main force-bearing component in the shield segment limiting mechanism of the mechanical excavation shield tunnel connecting passage. The hydraulic jacking assembly consists of four sets of hydraulic cylinders 2, with two hydraulic cylinders in each set, used to control the movement of the multi-degree-of-freedom limiting assembly on the guide assembly. They are installed on both sides of the guide rail 3. The two hydraulic cylinders 2 on both sides of the guide rail 3 are connected to the sliding limit block 5. The movement direction of the hydraulic cylinder 2 is the same as that of the guide rail 3. The movement of the sliding limit block 5 along the direction of the guide rail 3 can be controlled by the hydraulic cylinder 2.

[0031] In one embodiment, for the circular end 14 of the aforementioned irregular-shaped limiting pin, the difference between the diameter of the circular end 14 of the irregular-shaped limiting pin and the diameter of the shield segment limiting hole 6 is 2mm, and the difference between the size of the square end 13 of the irregular-shaped limiting pin and the size of the sliding groove 10 of the irregular-shaped limiting pin is 2mm; the guide rail 3, the irregular-shaped limiting pin 4, the sliding limiting block 5 and the hydraulic cylinder fixing pin 9 are all made of steel, so that when the axis of the shield segment 8 and the axis of the shield machine are offset, the irregular-shaped limiting pin 4 can be smoothly inserted into the interior of the shield segment limiting hole 6.

[0032] like Figure 7 As shown, according to another embodiment of the present invention, a method for limiting the positioning of tunnel segments during the excavation of a subway connecting passage by a tunnel boring machine is also provided. This method includes the following steps: S1. Install the hydraulic jacking assembly on the outside of the tunnel boring machine, and determine the installation positions of the guide assembly and the limit assembly based on the hydraulic jacking assembly.

[0033] In one embodiment, installing a hydraulic jacking assembly on the outside of the tunnel boring machine and determining the installation positions of the guide assembly and the limiting assembly based on the hydraulic jacking assembly includes the following steps: S11. Two sets of fixing pins 1 are installed at the shield machine launching sleeve 7 on the outside of the shield machine by electric welding, and hydraulic cylinders 2 are respectively installed on the outside of the two sets of fixing pins 1. S12. Select a parallel area between the two sets of hydraulic cylinders 2 and install two sets of guide rails 3, and set a sliding limit block 5 between the two sets of guide rails 3; S13. Add hydraulic oil to the inside of the hydraulic cylinder 2 and connect it to both ends of the sliding limit block 5. Use the working performance of the hydraulic cylinder 2 to pull the sliding limit block 5 and determine whether the sliding limit block 5 can slide normally on the outside of the guide rail 3. S14. If the sliding limit block 5 can slide normally on the outside of the guide rail 3, then determine the installation position of the hydraulic cylinder 2, the guide rail 3 and the sliding limit block 5. If the sliding limit block 5 cannot slide normally on the outside of the guide rail 3, then adjust the installation position of the two sets of guide rails 3.

[0034] S2. Based on the working state of the radial adjustment hydraulic jacking assembly of the shield tunnel segment 8, drive the limiting assembly to restrict the shield tunnel segment 8.

[0035] In one embodiment, based on the working state of the radial adjustment hydraulic jacking assembly of the tunnel segment 8, driving the limiting assembly to restrict the tunnel segment 8 includes the following steps: S21. After the shield tunnel segment 8 is pushed into place under the action of the shield machine, adjust the stroke of the hydraulic cylinder 2 to drive the sliding limit block 5 to move towards the shield tunnel segment 8, and align the sliding groove 10 of the special-shaped limit pin at the sliding limit block 5 with the shield tunnel segment limit hole 6. S22. With the assistance of the sliding groove 10 of the special-shaped limit pin, the special-shaped limit pin 4 is inserted into the inside of the shield segment limit hole 6, and it is determined whether the axis of the special-shaped limit pin 4 coincides with the radial direction of the shield segment 8. S23. If the axis of the irregular limiting pin 4 coincides with the radial direction of the shield segment 8, then proceed to step S24. If the axis of the irregular limiting pin 4 does not coincide with the radial direction of the shield segment 8, then return to step S22 to readjust the angle of the irregular limiting pin 4. S24. Adjust the hydraulic cylinder 2 to the retracted state to pull the sliding limit block 5 to move, and use the special-shaped limit pin 4 and the shield segment limit hole 6 to restrict the shield segment 8.

[0036] S3. Use the limiting effect to perform the assembly operation on the shield segment 8, and after the assembly is completed, adjust the working state of the hydraulic jacking component to release the limiting effect on the shield segment 8.

[0037] To facilitate understanding of the above technical solutions of the present invention, the working principle or operation method of the present invention in actual process will be described in detail below.

[0038] In practical applications, the hydraulic cylinder 2 is activated to push the sliding limit block 5 to move along the guide rail 3. After the irregular limit pin sliding groove 10 is aligned with the shield segment limit hole 6, the irregular limit pin 4 is inserted into the shield segment limit hole 6 through the irregular limit pin sliding groove 10, and the hydraulic cylinder 2 is driven to retract and pull the sliding limit block 5 to move, thereby driving the irregular limit pin 4 to move, restricting the displacement of the shield segment limit hole 6, and thus controlling the displacement of the shield segment 8, ensuring close contact between each part. Thus, the movement of the shield segment 8 is restricted by the action of the irregular limit pin 4 and the shield segment limit hole 6, and the assembly of the next ring of shield segments 8 can then proceed.

[0039] After assembly, the hydraulic cylinder 2 is extended to allow the irregularly shaped limiting pin 4 to slide between the shield segment limiting hole 6 and the sliding limiting block 5. Finally, the irregularly shaped limiting pin 4 is removed to release the limiting fixation, and the next shield segment 8 can be advanced normally.

[0040] Meanwhile, when the shield segment limiting hole 6 shifts, the two sets of hydraulic cylinders 2 can move independently to deal with the horizontal shift of the shield segment 8. Furthermore, when the shield segment 8 shifts vertically, the irregular limiting pin 4 can move vertically along the irregular limiting pin sliding groove 10, thereby solving the problem of vertical shift of the shield segment 8.

[0041] When the axis of the shield segment 8 and the axis of the shield machine are offset, since the size of the circular end 14 of the special-shaped limit pin is slightly smaller than the inner diameter of the shield segment limit hole 6, the special-shaped limit pin 4 can be smoothly inserted into the shield segment limit hole 6. Thus, the displacement of the shield segment 8 during the assembly process can be precisely controlled in the mechanical excavation of the shield tunnel connecting passage project.

[0042] In summary, by utilizing the above-mentioned technical solution of this invention, the present invention addresses the difficulty in limiting the position of the already constructed shield tunnel during the mechanical excavation of connecting passages. It proposes using a multi-degree-of-freedom limiting mechanism for adjustment, solving the problem of displacement of the shield segment limiting holes 6 caused by shield tunneling posture adjustments during mechanical construction. This invention, by setting up a hydraulic jacking assembly and controlling the limiting assembly through hydraulic cylinders 2, achieves precise control of the displacement of the shield segment 8 during the assembly of the transverse connecting passage segments. This improves the connection effect between the various components within the limiting mechanism, ensuring the control accuracy of the shield segment 8 during displacement. Simultaneously, it can apply pre-tensioning force to the shield segment 8 before the shield machine's propulsion cylinder retracts, solving the problem in the prior art where the retraction of the shield machine's propulsion cylinder affects the pressure at the tunnel face. This invention, by setting a limiting component and a guiding component, allows the angle of the irregularly shaped limiting pin 4 along the tangential direction to be adjusted by the sliding limiting block 5, so that it can adapt to the shield segment limiting hole 6 at different angles. This solves the problem of displacement of the shield segment limiting hole 6 due to the rotation torque of the shield machine cutterhead, etc., and achieves the purpose of freely limiting the shield segment 8 at multiple angles. At the same time, the guide rail 3 can provide a guiding function for the limiting component, ensuring that the sliding limiting block 5 can slide on the guide rail 3.

[0043] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A shield tunneling segment limiting device for tunnel boring machines (TBMs) excavating subway connecting passages, comprising a TBM launching sleeve, wherein the TBM launching sleeve is internally connected to shield tunneling segments via a limiting mechanism, characterized in that, The limiting mechanism includes a hydraulic jacking assembly installed on the outside of the tunnel boring machine's starting sleeve. A limiting component is provided at the top of the hydraulic jacking assembly, and a guide component is provided inside the limiting component. The limiting component includes sliding limiting blocks installed at both ends of the outer side of the tunnel boring machine's starting sleeve. A guide rail sliding groove is provided on one side of the sliding limiting block, and a special-shaped limiting pin sliding groove is provided inside the sliding limiting block. The hydraulic cylinder fixing pin is connected to the sliding limiting block through supports installed on both sides of the sliding limiting block, and the supports are provided with sliding limiting block connection holes inside. The limiting component includes a shield segment limiting hole opened inside the shield segment, and a special-shaped limiting pin is provided inside the shield segment limiting hole; The irregular-shaped limiting pin includes a circular end of the irregular-shaped limiting pin installed inside the limiting hole of the shield segment and a square end of the irregular-shaped limiting pin installed inside the sliding groove of the irregular-shaped limiting pin, and the sliding groove of the irregular-shaped limiting pin has a square structure. The diameter of the circular end of the irregular-shaped limiting pin differs from the diameter of the shield segment limiting hole by 2mm, and the size of the square end of the irregular-shaped limiting pin differs from the size of the sliding groove of the irregular-shaped limiting pin by 2mm.

2. The shield tunnel segment limiting device for tunnel boring machines excavating subway connecting passages according to claim 1, characterized in that, The hydraulic jacking assembly includes two sets of fixing pins installed on both sides of the tunnel boring machine's starting sleeve. A hydraulic cylinder is provided on the outer side of each of the two sets of fixing pins, and a hydraulic cylinder fixing pin is connected to the top of each hydraulic cylinder.

3. The shield tunnel segment limiting device for tunnel boring machines excavating subway connecting passages according to claim 1, characterized in that, The guiding component includes two sets of guide rails symmetrically installed on the outside of the tunnel boring machine's starting sleeve, and the guide rails are connected to the guide rail sliding grooves, and the guide rail sliding grooves have a convex structure.

4. A shield tunnel segment limiting device for excavating subway connecting passages using a tunnel boring machine, as described in claim 3, is characterized in that... The guide rail, the irregularly shaped limiting pin, the sliding limiting block, and the hydraulic cylinder fixing pin are all made of steel.

5. A method for limiting the positioning of tunnel segments during the excavation of a subway connecting passage by a tunnel boring machine, as described in any one of claims 1-4, characterized in that, The limiting method includes the following steps: S1. Install a hydraulic jacking assembly on the outside of the tunnel boring machine, and determine the installation positions of the guide assembly and the limiting assembly based on the hydraulic jacking assembly. S2. Based on the working state of the radial adjustment hydraulic jacking assembly of the shield tunnel segment, drive the limiting assembly to restrict the shield tunnel segment; S3. Use the limiting effect to perform the assembly operation of the shield tunnel segments, and after the assembly is completed, readjust the working state of the hydraulic jacking component to release the limiting effect on the shield tunnel segments.

6. The method for limiting the positioning of tunnel segments during the excavation of a subway connecting passage by a tunnel boring machine according to claim 5, characterized in that, The process of installing a hydraulic jacking assembly on the outside of the tunnel boring machine and determining the installation positions of the guide assembly and the limiting assembly based on the hydraulic jacking assembly includes the following steps: S11. Two sets of fixing pins are installed on the outer side of the shield machine starting sleeve using electric welding, and hydraulic cylinders are respectively installed on the outer side of the two sets of fixing pins. S12. Select a parallel area between the two sets of hydraulic cylinders and install two sets of guide rails, and set a sliding limit block between the two sets of guide rails; S13. Add hydraulic oil to the inside of the hydraulic cylinder and connect it to both ends of the sliding limit block. Use the working performance of the hydraulic cylinder to pull the sliding limit block and determine whether the sliding limit block can slide normally on the outside of the guide rail. S14. If the sliding limit block can slide normally on the outside of the guide rail, determine the installation position of the hydraulic cylinder, guide rail and sliding limit block. If the sliding limit block cannot slide normally on the outside of the guide rail, adjust the installation position of the two sets of guide rails.

7. A method for limiting the positioning of tunnel segments during the excavation of a subway connecting passage using a tunnel boring machine, as described in claim 6, is characterized in that... The operation of the radial adjustment hydraulic jacking assembly based on the shield tunnel segment, and the driving of the limiting assembly to restrict the shield tunnel segment, includes the following steps: S21. After the tunnel segment is advanced into place under the action of the tunnel boring machine, adjust the stroke of the hydraulic cylinder to drive the sliding limit block to move towards the tunnel segment, and align the sliding groove of the special-shaped limit pin at the sliding limit block with the limit hole of the tunnel segment. S22. With the assistance of the sliding groove of the special-shaped limit pin, insert the special-shaped limit pin into the inside of the shield segment limit hole, and determine whether the axis of the special-shaped limit pin coincides with the radial direction of the shield segment. S23. If the axis of the irregular limiting pin coincides with the radial direction of the shield segment, proceed to step S24. If the axis of the irregular limiting pin does not coincide with the radial direction of the shield segment, return to step S22 to readjust the angle of the irregular limiting pin. S24. Adjust the hydraulic cylinder to the retracted state to pull the sliding limit block to move, and use the special-shaped limit pin and the shield segment limit hole to restrict the shield segment.

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