Retaining device for preventing pipe joint from retreating and shield tunneling machine

Abstract

The utility model relates to the technical field of shield construction, in particular to a retaining device for preventing a pipe joint from retreating and a shield tunneling machine, the retaining device comprises a starting sleeve and a retaining mechanism, the starting sleeve is arranged at the starting end of a connection channel, and the starting sleeve forms a channel for the pipe joint to pass through; the retaining mechanism comprises a base, a flexible connecting piece and a retaining shaft, the base is arranged on the periphery of the starting sleeve, the retaining shaft is connected with the base through the flexible connecting piece, the retaining shaft is slidably arranged on the base in the radial direction of the starting sleeve, and the retaining shaft is used for stretching into a retaining hole of the pipe joint to prevent the pipe joint in the starting sleeve from retreating. An operator can insert the retaining shaft of the retaining mechanism into the retaining hole of the pipe joint, and the retaining shaft is pulled out after a new pipe joint is added. And the retaining mechanism cannot apply radial force to the pipe joint, so that the structural strength of the pipe joint cannot be influenced. Compared with a traditional retaining device, the retaining device is more stable in structure and better in retaining effect.

Description

Technical Field

[0001] This utility model relates to the field of tunnel boring machine (TBM) construction technology, and in particular to an anti-reverse device and a TBM that prevents tunnel sections from retracting. Background Technology

[0002] With continuous social development, urban surface space resources are becoming increasingly scarce, while the intensity of underground space development is constantly increasing, leading to a surge in demand for various connecting passages. Connecting passages are primarily used for fire rescue, fire evacuation, and drainage. When tunnel problems occur, personnel can be transferred through connecting passages, which also facilitate rescue operations; hence, they are known as "escape passages," making their construction particularly important. Among the related technologies for excavating connecting passages, mining methods are commonly used, with reinforcement of the excavation area achieved through methods such as freezing and ground reinforcement. Shield tunneling, as a relatively new construction method in recent years, features short construction cycles, safety and reliability, high mechanization, and strong applicability.

[0003] The shield tunneling method uses a small shield machine to excavate connecting passages under the seal of a steel sleeve. The small shield machine starts inside the main tunnel, and the thrust of the jacking cylinders and the water and soil pressure at the tunnel face form a balanced force, effectively maintaining pressure equilibrium at the tunnel face. However, when installing a new tunnel segment, the jacking cylinders retract, ceasing to provide thrust. Under the influence of water and soil pressure at the tunnel face, the shield machine and the already jacked tunnel segments tend to retreat, posing a risk. Therefore, during the tunnel jacking process, a backlash prevention device is required to lock the position of the already jacked tunnel segments and the tunnel jacking machine when installing a new segment, preventing excessive retreat. In existing technologies, locking tongue structures or clamps are used to tighten pipe sections to prevent backlash. Since the locking tongue structure is engaged with the rear end face of the already pushed-in pipe section, when a new pipe section is pushed in, it will be "pinched" by the new pipe section and the already pushed-in pipe section, which can easily cause jamming, leading to unlocking or backlash failure. Furthermore, the clamping force of the clamp is a harmful force to the pipe section's own structure. The greater the clamping force, the greater the impact on the structural strength of the pipe section, and in severe cases, it may even crack the pipe section.

[0004] Therefore, it is necessary to provide a new anti-reverse device to prevent pipe sections from retracting in order to solve the above-mentioned technical problems. Utility Model Content

[0005] The main purpose of this utility model is to provide a backstop device and tunnel boring machine to prevent tunnel sections from retreating, aiming to solve the problem that existing backstop devices for preventing tunnel sections from retreating are prone to failure and damage to the tunnel sections.

[0006] To achieve the above objectives, the present invention proposes a backstop device for preventing pipe section retraction, comprising a launching sleeve and a backstop mechanism. The launching sleeve is disposed at the launching end of the connecting channel, and the launching sleeve forms a channel for the pipe section to pass through. The backstop mechanism comprises a base, a flexible connector, and a backstop shaft. The base is disposed on the outer periphery of the launching sleeve, and the backstop shaft is connected to the base through the flexible connector. The backstop shaft is slidably disposed on the base along the radial direction of the launching sleeve, and the backstop shaft is used to extend into the backstop hole of the pipe section to prevent the pipe section inside the launching sleeve from retracting.

[0007] Optionally, the base includes a flange base, a bracket, and a guide sleeve. The flange base is welded to the launching sleeve. The bracket is detachably connected to the flange base by fasteners. The guide sleeve is arranged radially on the bracket along the launching sleeve, and the anti-reverse shaft is slidably arranged inside the guide sleeve.

[0008] Optionally, the bracket includes a top plate, a bottom plate, and side plates. The two ends of the top plate are respectively connected to the side plates, which are perpendicular to the top plate. A portion of the top plate protrudes from the edge of the starting sleeve. The guide sleeve is disposed on the portion of the top plate that protrudes from the edge of the starting sleeve and penetrates the top plate. The end of the side plate away from the top plate is detachably connected to the flange base through the bottom plate.

[0009] Optionally, there are two base plates, each of which is perpendicularly connected to one of the two side plates, and each base plate is provided with a corresponding flange base.

[0010] Optionally, the bracket further includes reinforcing ribs, and reinforcing ribs are provided between the side plate and the bottom plate, between the side plate and the bottom plate, and between the side plate and the guide sleeve.

[0011] Optionally, the number of anti-reverse mechanisms is one or more, each of the anti-reverse mechanisms is symmetrically arranged on the starting sleeve, and each of the anti-reverse mechanisms is spaced apart along the circumference of the starting sleeve.

[0012] Optionally, the anti-reverse shaft includes a shaft body, a limiting plate, and a grip handle. The first end of the shaft body is connected to the limiting plate, and the second end is chamfered for extending into the anti-reverse hole. The limiting plate is connected to the base through the flexible connector. The grip handle is located on the side of the limiting plate away from the shaft body.

[0013] Optionally, the anti-reverse device for preventing pipe section retraction further includes a drive mechanism, which is disposed on the base and its output end is connected to the anti-reverse shaft. The drive mechanism can drive the anti-reverse shaft to extend into or disengage from the anti-reverse hole of the pipe section.

[0014] In addition, this utility model also provides a tunnel boring machine for excavating a connecting passage, including a shield body, a propulsion device, and a backstop device as described above to prevent the tunnel sections from retracting. The shield body is located inside the main tunnel; the propulsion device is located at the starting end of the connecting passage, which can push the tunnel sections into the starting sleeve; the backstop device to prevent the tunnel sections from retracting is located at the starting end of the connecting passage.

[0015] In this invention, the operator can insert the anti-reverse shaft of the anti-reverse mechanism into the anti-reverse hole of the pipe section. After adding a new pipe section, the anti-reverse shaft can be pulled out. The anti-reverse mechanism does not apply radial force to the pipe section, thus not affecting the structural strength of the pipe section. Compared with traditional anti-reverse devices, its structure is more stable and its anti-reverse effect is superior. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the anti-retraction device for preventing pipe sections from retracting in an embodiment of this utility model;

[0018] Figure 2 This is a partial side view of the anti-retraction device for preventing pipe section retraction in an embodiment of this utility model;

[0019] Figure 3 This is a schematic diagram of the anti-reverse mechanism in an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram of the pipe section installation when the hydraulic cylinder of the propulsion device extends in an embodiment of this utility model;

[0021] Figure 5 This is a schematic diagram of the pipe section installation when the hydraulic cylinder of the propulsion device retracts in an embodiment of this utility model.

[0022] Explanation of icon numbers:

[0023] 1. Starting sleeve; 2. Anti-reverse mechanism; 2.1. Base; 2.1.1. Flange base; 2.1.2. Bracket; A1. Top plate

[0024] A2, base plate; A3, side plate; A4, reinforcing rib plate; 2.1.3, guide sleeve; 2.2, flexible connector; 2.3, anti-reverse shaft; 2.3.1, shaft body; 2.3.2, limiting plate; 2.3.3, grip handle; 3, pipe section; 3.1, anti-reverse hole; 4, propulsion device.

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0028] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication 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 utility model according to the specific circumstances.

[0030] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] This utility model proposes a backstop device and a tunnel boring machine to prevent tunnel sections from retracting, aiming to solve the problem that existing backstop devices for preventing tunnel sections from retracting are prone to failure and damage to the tunnel sections.

[0032] See Figures 1 to 3 The anti-reverse device for preventing pipe section retraction includes a starting sleeve 1 and an anti-reverse mechanism 2. The starting sleeve 1 is located at the starting end of the connecting channel and forms a channel for pipe section 3 to pass through. The anti-reverse mechanism 2 includes a base 2.1, a flexible connector 2.2, and an anti-reverse shaft 2.3. The base 2.1 is located on the outer periphery of the starting sleeve 1. The anti-reverse shaft 2.3 is connected to the base 2.1 through the flexible connector 2.2 and is slidably mounted on the base 2.1 along the radial direction of the starting sleeve 1. The anti-reverse shaft 2.3 is used to extend into the anti-reverse hole 3.1 of the pipe section 3 to prevent the pipe section 3 inside the starting sleeve 1 from retracting. During the excavation of the connecting passage, workers can insert the anti-reverse shaft 2.3 of the anti-reverse mechanism 2 into the anti-reverse hole 3.1 of the pipe section 3. After adding the new pipe section 3, the anti-reverse shaft 2.3 can be pulled out. The anti-reverse shaft 2.3 is connected to the base 2.1 through the flexible connector 2.2 to facilitate the insertion and removal of the anti-reverse shaft 2.3, improving the efficiency of the insertion and removal action. The anti-reverse mechanism 2 does not apply radial force to the pipe section 3, thus not affecting the structural strength of the pipe section 3. Compared with traditional anti-reverse devices, its structure is more stable and the anti-reverse effect is better. The anti-reverse mechanism 2 is set on the outer wall of the starting sleeve 1, eliminating the need to occupy additional space in the main tunnel to arrange the anti-reverse frame, which is more conducive to the arrangement of the subsequent supporting trolley. In this embodiment, the flexible connector 2.2 is a chain, and the assembly of the chain can be adjusted in length and welded according to actual needs.

[0033] The base 2.1 includes a flange base 2.1.1, a bracket 2.1.2, and a guide sleeve 2.1.3. The flange base 2.1.1 is welded to the launching sleeve 1. The bracket 2.1.2 is detachably connected to the flange base 2.1.1 via fasteners. The guide sleeve 2.1.3 is radially disposed on the bracket 2.1.2 along the launching sleeve 1, and the anti-reverse shaft 2.3 is slidably disposed within the guide sleeve 2.1.3. The detachable connection between the bracket 2.1.2 and the flange base 2.1.1 on the launching sleeve 1 facilitates the disassembly, assembly, and maintenance of the anti-reverse mechanism 2 on the launching sleeve 1, and also facilitates transportation before assembly. Operators can slide the anti-reverse shaft 2.3 along the guide sleeve 2.1.3 to achieve the insertion and removal action of the anti-reverse shaft 2.3 within the anti-reverse hole 3.1 of the pipe section 3. The guide sleeve 2.1.3 ensures that the anti-reverse shaft 2.3 can be freely inserted and removed without obstruction.

[0034] Specifically, the bracket 2.1.2 includes a top plate A1, a bottom plate A2, and a side plate A3. The two ends of the top plate A1 are respectively connected to the side plate A3, which is perpendicular to the top plate A1. A portion of the top plate A1 is exposed at the edge of the starting sleeve 1. The guide sleeve 2.1.3 is located on the portion of the top plate A1 that is exposed at the edge of the starting sleeve 1 and passes through the top plate A1. The end of the side plate A3 away from the top plate A1 is detachably connected to the flange base 2.1.1 through the bottom plate A2. The guide sleeve 2.1.3 is located on the part of the top plate A1 that exposes the edge of the launching sleeve 1, and the anti-reverse hole 3.1 of the inner tube section 3 of the launching sleeve 1 is also exposed in the launching sleeve 1, so that the anti-reverse shaft 2.3 in the guide sleeve 2.1.3 can be inserted into the anti-reverse hole 3.1 to prevent the tube section 3 in the launching sleeve 1 from retracting. The two ends of the top plate A1 are supported by the bottom plate A2 and the side plate A3 to ensure that there is enough space between the top plate A1 and the outer wall of the launching sleeve 1 for the guide sleeve 2.1.3 to be installed and for the anti-reverse shaft 2.3 to be inserted and removed.

[0035] Furthermore, there are two base plates A2, which are perpendicularly connected to the two side plates A3 respectively, and each base plate A2 is provided with a flange base 2.1.1. The base plates A2 at both ends of the top plate A1 are detachably connected to the two flange bases 2.1.1 respectively to increase the connection strength between the bracket 2.1.2 and the launching sleeve 1.

[0036] Furthermore, the bracket 2.1.2 also includes reinforcing ribs A4, which are provided between the side plate A3 and the bottom plate A2, between the side plate A3 and the bottom plate A2, and between the side plate A3 and the guide sleeve 2.1.3. The reinforcing ribs A4 form a crisscrossing reinforcement structure to ensure that the bracket 2.1.2 has reliable load-bearing capacity while providing a high-strength mounting base for the backrest shaft 2.3.

[0037] Furthermore, the number of anti-reverse mechanisms 2 is one or more, and each anti-reverse mechanism 2 is symmetrically arranged on the launching sleeve 1, with each anti-reverse mechanism 2 spaced apart circumferentially along the launching sleeve 1. Multiple sets of anti-reverse mechanisms 2 are positioned and assembled on the outer wall of the launching sleeve 1 according to the designed angular dimensions. Before adding a new pipe section 3, the operator can insert the anti-reverse shaft 2.3 of the anti-reverse mechanism 2 into the anti-reverse hole 3.1 of the pipe section 3. After adding the new pipe section 3, the anti-reverse shaft 2.3 can be pulled out. The number and distribution of the anti-reverse mechanisms 2 ensure that a sufficient number of anti-reverse shafts 2.3 are aligned with the anti-reverse holes 3.1 of the pipe section 3, and that no radial force is applied to the pipe section 3, thus not affecting the structural strength of the pipe section 3.

[0038] In this example of embodiment one, the anti-reverse shaft 2.3 includes a shaft body 2.3.1, a limiting plate 2.3.2, and a grip handle 2.3.3. The first end of the shaft body 2.3.1 is connected to the limiting plate 2.3.2, and the second end is chamfered for extending into the anti-reverse hole 3.1. The limiting plate 2.3.2 is connected to the base 2.1 via a flexible connector 2.2. The grip handle 2.3.3 is located on the side of the limiting plate 2.3.2 away from the shaft body 2.3.1. The limiting plate 2.3.2 can limit the shaft body 2.3.1, preventing it from falling, and facilitating the insertion and removal of the shaft body 2.3.1 by the operator using the handle of the limiting plate 2.3.2.

[0039] In another example of this embodiment, the anti-retraction device for the pipe section further includes a drive mechanism. The drive mechanism is mounted on the base 2.1, and its output end is connected to the anti-retraction shaft 2.3. The drive mechanism can drive the anti-retraction shaft 2.3 to extend into or disengage from the anti-retraction hole 3.1 of the pipe section 3. By setting the drive mechanism to drive the insertion and removal of the anti-retraction shaft 2.3, manual insertion and removal of the anti-retraction shaft 2.3 by the operator is eliminated, reducing the operator's workload and improving the ease of use of the anti-retraction mechanism 2 for the pipe section 3. The drive mechanism can be a telescopic hydraulic cylinder or a telescopic pneumatic cylinder, which is easy to arrange and can output a stable driving force.

[0040] This embodiment also provides a tunnel boring machine for excavating a connecting passage, including a shield body, a propulsion device 4, and a backstop device as described above to prevent the tunnel sections from retracting. The shield body is located inside the main tunnel; the propulsion device 4 is located at the starting end of the connecting passage and is capable of pushing the tunnel section 3 into the starting sleeve 1; the backstop device to prevent the tunnel section from retracting is located at the starting end of the connecting passage.

[0041] like Figure 4 As shown, in this embodiment, when the anti-retraction mechanism 2 is in use, the cylinder of the propulsion device 4 is fully extended; when the cylinder of the propulsion device 4 is about to retract and a new pipe section 3 is to be added, the operator can insert the anti-retraction shaft 2.3 of the anti-retraction mechanism 2 into the anti-retraction hole 3.1 of the pipe section 3; as Figure 5 As shown, the hydraulic cylinder of the propulsion device 4 retracts. After the addition of the new pipe section 3 is completed, the anti-retraction shaft 2.3 can be pulled out to drive the propulsion device 4 again to push the new pipe section 3 into the starting sleeve 1.

[0042] Since the tunnel boring machine includes the anti-reverse device for preventing tunnel sections from retracting as described above, the tunnel boring machine possesses all the beneficial effects of the anti-reverse device for preventing tunnel sections from retracting, which will not be elaborated here.

[0043] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A backstop device for preventing pipe section retraction, characterized in that, The application relates to a pipe joint starting sleeve and a pipe joint starting sleeve stop mechanism.

2. The retreat-preventing device according to claim 1, wherein The base (2.1) comprises a flange base (2.1.1), a support (2.1.2) and a guide sleeve (2.1.3), the flange base (2.1.1) is welded to the starting sleeve (1); the support (2.1.2) is detachably connected to the flange base (2.1.1) through fasteners; the guide sleeve (2.1.3) is arranged on the support (2.1.2) along the radial direction of the starting sleeve (1), and the stop shaft (2.3) is slidingly arranged in the guide sleeve (2.1.3).

3. The retreat-preventing device according to claim 2, wherein The support (2.1.2) comprises a top plate (A1), a bottom plate (A2) and a side plate (A3), both ends of the top plate (A1) are connected with the side plates (A3) arranged perpendicularly to the top plate (A1), part of the top plate (A1) is exposed to the edge of the starting sleeve (1), the guide sleeve (2.1.3) is arranged on the part of the top plate (A1) exposed to the edge of the starting sleeve (1) and penetrates the top plate (A1); one end of the side plate (A3) away from the top plate (A1) is detachably connected to the flange base (2.1.1) through the bottom plate (A2).

4. The retreat-preventing device according to claim 3, wherein The number of the bottom plates (A2) is two, the two bottom plates (A2) are perpendicularly connected with the two side plates (A3) respectively, and one flange base (2.1.1) is arranged corresponding to one bottom plate (A2).

5. The back-off preventing device for pipe sections according to claim 4, wherein The support (2.1.2) further comprises a reinforcing rib plate (A4), the reinforcing rib plate (A4) is arranged between the side plate (A3) and the bottom plate (A2), between the side plate (A3) and the bottom plate (A2) and between the side plate (A3) and the guide sleeve (2.1.3).

6. The back-off preventing device according to any one of claims 1 to 5, wherein The number of the stop mechanisms (2) is one or more than one, each stop mechanism (2) is symmetrically arranged on the starting sleeve (1), and each stop mechanism (2) is arranged at intervals along the circumferential direction of the starting sleeve (1).

7. The back-off preventing device for pipe sections according to claim 6, wherein The retreat-preventing shaft (2.3) comprises a shaft body (2.3.1), a limiting plate (2.3.2) and a handle (2.3.3), the first end of the shaft body (2.3.1) is connected with the limiting plate (2.3.2), the second end is provided with a chamfer for extending into the retreat-preventing hole (3.1); the limiting plate (2.3.2) is connected with the base (2.1) through the flexible connecting piece (2.2); the handle (2.3.3) is arranged on the side of the limiting plate (2.3.2) away from the shaft body (2.3.1).

8. The back-off preventing device for pipe sections according to claim 6, wherein The retreat-preventing device further comprises a driving mechanism, the driving mechanism is arranged on the base (2.1), and the output end of the driving mechanism is connected with the retreat-preventing shaft (2.3), the driving mechanism can drive the retreat-preventing shaft (2.3) to extend into or out of the retreat-preventing hole (3.1) of the pipe joint (3).

9. A tunneling machine for excavating a connecting passage, characterized in that The shield tunneling machine comprises a shield body, a pushing device (4) and the retreat-preventing device, the shield body is arranged in a main tunnel; the pushing device (4) is arranged at the starting end of the connecting channel and can push the pipe joint (3) into the starting sleeve (1); the retreat-preventing device is arranged at the starting end of the connecting channel.

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