Arch changing device for TBM and TBM

Abstract

The utility model belongs to the technical field of special devices for carrying or placing tunnel lining components, and particularly provides an arch changing device for a TBM and the TBM. The arch changing device for the TBM comprises a main machine platform and a transport vehicle, a lifting mechanism is arranged on the transport vehicle, an arch frame supporting structure used for supporting an arch frame is arranged on the lifting mechanism, and the lifting stroke of the lifting mechanism meets the requirement that the arch frame on the arch frame supporting structure can abut against the tunnel wall. At least one supporting leg capable of being folded and put down is arranged on a frame of the transport vehicle, and the supporting leg has a folded state in which the supporting leg is folded when the transport vehicle moves front and back and also has a put-down state in which the supporting leg is put down and supported on the main machine platform to further support the transport vehicle when the transport vehicle moves in place. The TBM comprises the arch changing device. When the lifting mechanism lifts the top arch frame, the supporting legs can be lowered to be supported on the main machine platform to support the transport vehicle, the walking wheels of the transport vehicle do not bear independently any more, then the stress condition of the walking wheels is improved, and the reliability of the transport vehicle is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of special devices for transporting or placing tunnel lining components, in particular to an arch replacement device for a TBM and the TBM. Background Art

[0002] With the widespread application of open-type tunnel boring machines (TBMs) in water conservancy, hydropower, mountain tunneling, and other fields, the geological conditions encountered by TBMs are becoming increasingly complex. To ensure the stability of the surrounding rock and construction safety during construction in areas with crushed or rockburst conditions, initial support measures typically include anchor bolting, arch frame assembly, and concrete spraying. The TBM is equipped with an arch frame installation system at the front of the main machine (typically on the main beam or inner gantry) that automatically assembles the arch frame.

[0003] Under extreme conditions, affected by surrounding rock convergence or rock bursts, the initial support arch will produce significant deformation, and in most cases, the deformation of the top arch is the largest, which can seriously affect the passage of the TBM's supporting system. In order to ensure that the TBM's supporting system can smoothly pass through the arch deformation section, the arch with large deformation must be removed and replaced with a new one. At present, when replacing the arch of the TBM main section, temporary wooden frames are mostly used with jacks to support the original deformed arch at the top of the tunnel. The broken surrounding rock at the top is then manually chiseled off and replaced with a new arch. When removing the deformed arch and installing the new arch, the arch is generally lifted manually, which is labor-intensive.

[0004] Patent application CN117823194A discloses a multifunctional transport device for tunnel boring construction. The device comprises a main beam and a trolley (transport vehicle). The main beam is equipped with a track, and the trolley is equipped with a drive unit that propels it along the track. The main beam can be modified from the main beam of a tunnel boring machine or installed separately. Essentially, the main beam acts as a platform that enables the trolley to move forward and backward. The trolley is equipped with a lifting mechanism, topped with a support frame for supporting a steel arch and construction materials. During construction, the arch is placed on the support frame, and the trolley moves from back to front to transport the arch to the designated location. The lifting mechanism then lifts the arch upward to support the tunnel.

[0005] Although the above-mentioned transport device can be used for arch replacement operations in the main section of the TBM to reduce the intensity of manual labor. However, when replacing a new arch frame, the lifting mechanism needs to lift the arch frame to a position close to the tunnel wall. The reaction force exerted by the tunnel wall on the arch frame is borne by the walking wheels, which can easily cause damage to the walking wheels and lack reliability. In addition, in some cases, the tunnel wall undergoes large deformation, and the reaction force of the tunnel wall is not in the vertical direction. In simple terms, the reaction force can be decomposed into horizontal and vertical components. When the horizontal component of force acts on the trolley, the trolley tends to move forward or backward. The above-mentioned transport device can only offset the horizontal component of force when the driving components are locked. Long-term use can easily cause damage to the driving components and lack reliability. Utility Model Content

[0006] The purpose of the present invention is to provide a camber changing device for a TBM to solve the technical problem in the prior art that the running wheels of a transport vehicle capable of performing camber changing operations are easily damaged and lack reliability. The purpose of the present invention is also to provide a TBM to solve the same technical problem.

[0007] To achieve the above objectives, the technical solution of the arch changing device for TBM provided by the present invention is:

[0008] A device for replacing an arch frame for a TBM comprises a main platform for installation on the main beam or inner cover of the TBM and a transport vehicle arranged on the main platform and movable forward and backward relative to the main platform. The transport vehicle is provided with a lifting mechanism, and an arch frame supporting structure for supporting the arch frame is provided on the lifting mechanism. The lifting stroke of the lifting mechanism is sufficient to press the arch frame on the arch frame supporting structure tightly against the tunnel wall. The frame of the transport vehicle is provided with at least one support leg that can be folded and lowered. The support leg has a folded state in which it is folded when the transport vehicle moves forward and backward, and a lowered state in which it is lowered and supported on the main platform when the transport vehicle moves into position, thereby supporting the transport vehicle.

[0009] As a further improvement, at least one supporting leg is provided on each of the left and right sides of the frame.

[0010] As a further improvement, the supporting legs are of a swinging type, and the vehicle frame is provided with a limiting structure for cooperating with the supporting legs to limit them to remain in a retracted state.

[0011] As a further improvement, the swing axis of the supporting leg extends in the front-rear direction.

[0012] As a further improvement, the limiting structure includes a limiting plate fixed to the frame, and the arch changing device also includes a detachable fastener for connecting the support leg and the limiting plate when the support leg is in a retracted state. The support leg and the limiting plate are respectively provided with mounting holes for installing the detachable fastener.

[0013] As a further improvement, the lifting mechanism includes a telescopic drive device and a guide column installed on the frame along the vertical direction, and the telescopic output end of the telescopic drive device is connected to the guide column.

[0014] As a further improvement, the vehicle frame is a box-type structure with an opening on the top, a part of the lifting mechanism is located inside the vehicle frame, and a channel is provided on the vehicle frame for the pipelines connected to the lifting mechanism to pass through.

[0015] As a further improvement, the main platform includes tracks arranged at intervals on the left and right for guiding the transport vehicle forward and backward, and a working platform for workers to perform arch changing operations is fixed on the tracks.

[0016] As a further improvement, the transport vehicle is provided with a travel drive mechanism for driving the transport vehicle to move forward and backward, and a cover plate is also installed on the vehicle frame for shielding the travel drive mechanism throughout the entire journey of the transport vehicle's forward and backward movement.

[0017] The present utility model is an improved invention with the following beneficial effects: during the movement of the transport vehicle relative to the main platform, the arch frame on the arch frame support structure can be moved to the position where the arch frame needs to be replaced and installed. The lifting stroke of the lifting mechanism is sufficient to press the arch frame against the tunnel wall. When replacing the arch, there is no need for workers to lift the arch frame. The lifting mechanism can be raised to push the arch frame to the designated position, reducing the labor intensity. Moreover, when removing the arch frame, the lifting mechanism can also lift and support the arch frame to be removed. After the arch frame and its circumferentially adjacent arch frames are removed, the lifting mechanism is lowered. In this way, there is no need for manual lifting of the arch frame during the arch frame removal process. At the same time, the support legs can be retracted during the forward and backward movement of the transport vehicle without affecting the normal movement of the transport vehicle. When the lifting mechanism is raised to support the arch frame (including installing the arch frame and removing the old arch frame), the support legs can be lowered to support the main platform to support the transport vehicle. The running wheels of the transport vehicle no longer bear the load alone, thereby improving the stress condition of the running wheels and enhancing the reliability of the transport vehicle. At the same time, the static friction between the support legs and the main platform can offset the horizontal reaction force from the tunnel wall. If the transport vehicle is equipped with a travel drive mechanism, this can also improve the force of the travel drive mechanism of the transport vehicle and further improve reliability.

[0018] To achieve the above objectives, the technical solution of the TBM provided by the present invention is:

[0019] A TBM includes a main beam or an inner frame, and an arch-changing device is installed on the main beam or the inner frame. The arch-changing device includes a main platform installed on the main beam or the inner frame of the TBM and a transport vehicle arranged on the main platform and movable forward and backward relative to the main platform. The transport vehicle is provided with a lifting mechanism, and the lifting mechanism is provided with an arch support structure for supporting the arch. The lifting stroke of the lifting mechanism is sufficient to press the arch on the arch support structure tightly against the tunnel wall. The frame of the transport vehicle is provided with at least one retractable and lowerable support leg, and the support leg has a retracted state in which it is retracted when the transport vehicle moves forward and backward, and a lowered state in which it is lowered and supported on the main platform when the transport vehicle moves into position, thereby supporting the transport vehicle.

[0020] As a further improvement, at least one supporting leg is provided on each of the left and right sides of the frame.

[0021] As a further improvement, the supporting legs are of a swinging type, and the vehicle frame is provided with a limiting structure for cooperating with the supporting legs to limit them to remain in a retracted state.

[0022] As a further improvement, the swing axis of the supporting leg extends in the front-rear direction.

[0023] As a further improvement, the limiting structure includes a limiting plate fixed to the frame, and the arch changing device also includes a detachable fastener for connecting the support leg and the limiting plate when the support leg is in a retracted state. The support leg and the limiting plate are respectively provided with mounting holes for installing the detachable fastener.

[0024] As a further improvement, the lifting mechanism includes a telescopic drive device and a guide column installed on the frame along the vertical direction, and the telescopic output end of the telescopic drive device is connected to the guide column.

[0025] As a further improvement, the vehicle frame is a box-type structure with an opening on the top, a part of the lifting mechanism is located inside the vehicle frame, and a channel is provided on the vehicle frame for the pipelines connected to the lifting mechanism to pass through.

[0026] As a further improvement, the main platform includes tracks arranged at intervals on the left and right for guiding the transport vehicle forward and backward, and a working platform for workers to perform arch changing operations is fixed on the tracks.

[0027] As a further improvement, the transport vehicle is provided with a travel drive mechanism for driving the transport vehicle to move forward and backward, and a cover plate is also installed on the vehicle frame for shielding the travel drive mechanism throughout the entire journey of the transport vehicle's forward and backward movement.

[0028] The present utility model is an improved invention with the following beneficial effects: during the movement of the transport vehicle relative to the main platform, the arch frame on the arch frame support structure can be moved to the position where the arch frame needs to be replaced and installed. The lifting stroke of the lifting mechanism is sufficient to press the arch frame against the tunnel wall. When replacing the arch, there is no need for workers to lift the arch frame. The lifting mechanism can be raised to push the arch frame to the designated position, reducing the labor intensity. Moreover, when removing the arch frame, the lifting mechanism can also lift and support the arch frame to be removed. After the arch frame and its circumferentially adjacent arch frames are removed, the lifting mechanism is lowered. In this way, there is no need for manual lifting of the arch frame during the arch frame removal process. At the same time, the support legs can be retracted during the forward and backward movement of the transport vehicle without affecting the normal movement of the transport vehicle. When the lifting mechanism is raised to support the arch frame (including installing the arch frame and removing the old arch frame), the support legs can be lowered to support the main platform to support the transport vehicle. The running wheels of the transport vehicle no longer bear the load alone, thereby improving the stress condition of the running wheels and enhancing the reliability of the transport vehicle. At the same time, the static friction between the support legs and the main platform can offset the horizontal reaction force from the tunnel wall. If the transport vehicle is equipped with a travel drive mechanism, this can also improve the force of the travel drive mechanism of the transport vehicle and further improve reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural schematic diagram (perspective view) of an embodiment of the arch replacement device for TBM in the present utility model;

[0030] Figure 2 A schematic structural diagram (perspective view) of an embodiment of the arch changing device for a TBM in the present invention when in operation from another viewing angle;

[0031] Figure 3 This is a longitudinal view of an embodiment of the arch changing device for TBM in the present invention when in operation;

[0032] Figure 4 This is a structural schematic diagram of an embodiment of an arch replacement device for TBM in the present utility model;

[0033] Figure 5 This is a schematic diagram of the working state of the embodiment of the arch replacement device for TBM in the present utility model when installed in the TBM;

[0034] Figure 6 for Figure 3 A partial schematic diagram of the location of the middle arch replacement device.

[0035] Description of reference numerals:

[0036] 1. Lifting cylinder; 2. Arch support structure; 3. Guide column; 4. Frame; 5. Support leg; 6. Cylinder seat; 7. Travel drive cylinder; 8. Cover plate; 9. Track; 10. Travel wheel; 11. Vertical support; 12. Working platform; 13. Passageway; 14. Limit plate; 100, Arch; 200, Cutter head; 300, Shield; 400, Main beam. DETAILED DESCRIPTION

[0037] In response to the problems of arch frame replacement and installation in the existing technology, the basic technical concept of the present invention is to provide, on the basis of ensuring that the lifting mechanism on the transport vehicle can smoothly support the arch frame to the tunnel wall, additional retractable support legs are configured to support the transport vehicle. When the lifting mechanism is raised to support the arch frame, the support legs can be lowered and supported on the main platform to support the transport vehicle, avoid overloading of the walking wheels, and thereby make the arch replacement device have higher reliability.

[0038] The present invention is further described in detail below with reference to the embodiments.

[0039] Specific embodiments of the arch changing device for TBM provided by the utility model:

[0040] The overall structure of the arch changing device for TBM (hereinafter referred to as the arch changing device) provided in this embodiment is as follows: Figures 1-4 As shown, it includes a host platform and a transport vehicle, and the host platform can be installed on the TBM. Figure 5 and Figure 6 In the main beam TBM shown, the main platform can be mounted on the TBM's main beam 400. For a keel-type TBM, the main platform can be mounted on the inner keel. The transport vehicle can move back and forth along the main platform. Specifically, it is equipped with running wheels 10 and a travel drive mechanism to drive its forward and backward movement.

[0041] The transport vehicle is also provided with a lifting mechanism, and an arch support structure 2 is provided on the lifting mechanism. Figure 2 As shown, the arch frame 100 can be placed on the arch frame support structure 2. The arch frame support structure 2 has the function of supporting the arch frame 100. When the lifting mechanism rises, the arch frame support structure 2 can be lifted up, thereby driving the arch frame 100 to move upward. In order to meet the replacement and installation requirements of the arch frame 100, the lifting stroke of the lifting mechanism should be sufficient to support the arch frame 100 to a position close to the tunnel wall. In this way, there is no need to manually lift the arch frame 100, reducing labor intensity. Of course, when dismantling the arch frame, the lifting mechanism can also be raised to support the old arch frame. After the staff releases the connection between the old arch frame and its adjacent arch, the lifting mechanism descends and the arch frame 100 is transported back to the rear by the transport vehicle.

[0042] The frame 4 of the transport vehicle is provided with support legs 5, which can be folded and lowered. When the transport vehicle is moving, the support legs 5 are in a folded state and do not affect the normal movement of the transport vehicle. After the transport vehicle is moved into place, before the arch frame is removed or replaced, the support legs 5 are lowered. The support legs 5 can be supported on the main platform in the lowered state to support the transport vehicle. When the new arch frame 100 is installed, the reaction force from the tunnel wall can be borne or offset by the support legs 5, and the running wheels 10 are no longer the main force-bearing components, thereby avoiding overload of the running wheels 10 and improving reliability. In addition, under some working conditions, the static friction between the support legs 5 and the main platform can offset the horizontal component of the reaction force, so the support legs 5 can also play a role in protecting the travel drive mechanism, improving the force on the travel drive mechanism and improving reliability.

[0043] Analyzing the function of the support leg 5, it can be seen that at least one support leg 5 should be provided. In this embodiment, as a preferred embodiment, Figure 1 and Figure 2 As shown, support legs 5 are provided on both sides of the frame 4. This ensures a more balanced force on both sides of the frame 4, further enhancing the stability of the transport vehicle during arch changes. Specifically, two support legs 5 are provided on each side of the frame 4, thus providing four-point support for the transport vehicle. Of course, in other embodiments, only one support leg 5 may be provided on each side of the frame 4, in which case the size of the support legs 5 can be appropriately increased.

[0044] Furthermore, the support legs 5 are swingable, allowing them to be stowed and lowered by swinging them to different positions. In other words, the support legs 5 are hinged to the vehicle frame 4. The vehicle frame 4 also features a retaining structure that cooperates with the support legs 5 to maintain their stowed position, preventing them from accidentally lowering while the transport vehicle is in motion. To facilitate stowage of the support legs 5, the bottom ends of the support legs 5, located near the vehicle frame when in the lowered state, are rounded. This type of support leg 5 is structurally simple and requires no additional drive mechanism; it can simply be stowed and lowered manually by pushing the support legs 5. Furthermore, after being lowered, the support legs 5 are effectively open, increasing the distance between them and improving support effectiveness. Of course, in other embodiments, where cost is not a constraint, the support legs 5 can also be hydraulically retractable, with the retraction direction being vertical, depending on the actual situation. When support legs 5 are provided on both left and right sides of the vehicle frame 4, they can be extended and retracted diagonally, forming an overall "eight" shape.

[0045] Specifically, the swing axis of the support leg 5 extends in the front-to-back direction. In other words, the support leg 5 actually swings left and right. This ensures that the support leg 5 does not occupy the front and rear positions of the frame 4 and does not interfere with other mechanisms installed or connected to the front and rear sides of the frame 4. Of course, in other embodiments, the support leg 5 can also swing forward and backward without interfering with other mechanisms on the front and rear sides of the frame 4, that is, the swing axis of the support leg 5 extends in the left and right direction.

[0046] Regardless of how the support leg 5 swings, as a specific implementation of the limiting structure, Figure 1 and Figure 2 As shown, the limiting structure includes a limiting plate 14 fixed to the vehicle frame 4. The fixing method can be welding, screw connection, etc. At the same time, the arch changing device is also equipped with a removable fastener. The removable fastener is used to connect the support leg 5 and the limiting plate 14 when the support leg 5 is in the retracted state. Correspondingly, the support leg 5 and the limiting plate 14 are each provided with a mounting hole for receiving the fastener. Specifically, the fastener can be a cylindrical fastener, such as a pin, bolt, or stud. The mounting hole in the limiting plate 14 is a receptacle for inserting the fastener, and the mounting hole in the support leg 5 is a limiting hole corresponding to the receptacle. The fastener is inserted into both the limiting hole and the receptacle, thereby limiting the swinging of the support leg 5. The insertion direction of the fastener is not limited, but at least one of the mounting holes in the support leg 5 and the limiting plate 14 should be a through hole. Of course, in addition to using a cylindrical fastener, other methods are not excluded, such as using a rope, a clamp, or other structures to pass through the mounting hole to connect the support leg 5 and the limiting plate 14.

[0047] Of course, the limiting structure is not limited to the above form. In other embodiments, the limiting structure can be a magnet (such as a permanent magnet) installed on the frame 4. After the support leg 5 is retracted into place, the magnet attracts the support leg 5 to keep it in the retracted state. At this time, the limiting plate 14 with the socket may no longer be configured.

[0048] For the transport vehicle, as a relatively simple lifting mechanism implementation method, such as Figures 1-6 As shown, the lifting mechanism is a telescopic drive device, which is telescopic up and down, and is preferably a lifting cylinder 1. Of course, in other embodiments, the use of an electric push rod is not excluded. In addition, a guide column 3 is also installed on the frame 4, and the guide column 3 is installed on the frame 4 for up and down guidance. Specifically, a guide sleeve is installed on the frame 4. The telescopic output end of the telescopic drive device is connected to the guide column 3. For the lifting cylinder 1, its piston rod is connected to the guide column 3. This can improve the force of the telescopic drive device, and if there is an overload problem, the piston rod and the seal can be protected. In other embodiments, the lifting mechanism does not exclude the use of a scissors-type lifting mechanism, in which case the guide column 3 may no longer be provided.

[0049] In addition, if Figures 1-4 As shown, the frame 4 is a box-shaped structure as a whole, and a part of the lifting mechanism is located inside the frame 4, that is, in the internal space of the box-shaped structure. At the same time, the top of the frame 4 has an opening, and the movable output end of the lifting mechanism can pass through the opening. This type of frame 4 can protect the lifting mechanism and prevent it from being damaged by debris falling from the top of the tunnel. In order to meet the installation requirements of pipelines such as hydraulic pipelines, Figure 2 As shown, the frame 4 is also provided with a channel 13 for the pipeline connected to the lifting mechanism to pass through. Specifically, the frame 4 includes a main frame and a guard plate outside the main frame, and the guard plate encloses to form a box-shaped structure. The guard plate on one side is divided into two sections, such as Figure 1 As shown, the lower guard plate is larger and can be installed last after the lifting mechanism is installed. The upper guard plate can be installed first to facilitate the installation of the corresponding connection foundation for fixing the lifting mechanism, such as sleeves, brackets, etc.

[0050] As an implementation method of the host platform, Figures 1-4 As shown, the main platform includes two parallel tracks 9, which coordinate with the transport vehicle's forward and backward guidance. Specifically, the tracks 9 are H-shaped steel tracks, with running wheels 10 guided forward and backward within the grooves formed by the upper and lower wing panels and the web. Considering that manual assistance is required during the arch changing operation, and to increase the area available for staff to maneuver, the arch changing device also includes a work platform 12, fixed relative to the tracks 9. Staff can perform arch changing operations from this work platform 12. Specifically, the work platform 12 can be welded or bolted to the upper wing panels of the tracks 9.

[0051] In addition, if Figures 1-6 As shown, when installing the track 9, the two tracks 9 can also be installed on the main beam 400 through different vertical supports 11. According to the structure of the main beam 400, the height of the vertical supports 11 should also be adaptively adjusted to ensure that the track 9 is flat. Of course, in other embodiments, the two tracks 9 can also be installed on the same larger support beam, such as the track 9 installation method disclosed in patent application publication number CN117823194A.

[0052] On the basis that the space of the TBM is sufficient to install a larger support beam, the host platform can also be provided with a guide groove on the support beam without installing a separate track 9, and the transport vehicle can move forward and backward along the guide groove.

[0053] Regarding the transport vehicle's drive mechanism, the transport vehicle in this embodiment is equipped with a telescopic travel drive mechanism, specifically a travel drive cylinder 7. The travel drive cylinder 7 is mounted between two rails 9 via a cylinder mount 6. Its piston rod is connected to the transport vehicle, and its telescopic movement allows the transport vehicle to move forward and backward. To prevent debris from falling from the top during arch replacement operations from damaging the travel drive cylinder 7, a cover plate 8 is also mounted on the vehicle frame 4. The cover plate 8 is used to shield the travel drive cylinder 7 and can move forward and backward with the transport vehicle. The cover plate 8 has a certain length to shield the travel drive cylinder 7 throughout its full forward and backward movement with the transport vehicle. The travel drive cylinder 7 can continuously output a relatively stable thrust / pull force, providing higher reliability. In a preferred embodiment, the upper surface of the cover plate 8 is flush with the upper surface of the rails 9. Of course, in other embodiments, the travel drive mechanism can also be replaced with an electric motor or hydraulic motor, such as the drive component disclosed in patent application CN117823194A. Alternatively, the travel drive device can be a winch, with two winches connected to the front and rear ends of the transport vehicle. When the transport vehicle needs to move forward, the front winch reels in the rope and the rear winch releases the rope. When the transport vehicle needs to move backward, the rear winch reels in the rope and the front winch releases the rope. In this case, cover plates 8 should be installed at both the front and rear ends of the vehicle frame 4 to cover the motor rollers of the winches.

[0054] It should be noted that in other embodiments, this type of transport vehicle with support legs can be equipped without a travel drive mechanism. During arch replacement, workers push and / or pull the transport vehicle to the designated location. The support legs are lowered and supported on the main platform to maintain the transport vehicle in the designated location. Compared to arch lifting, the transport vehicle is equipped with travel wheels, and pushing and pulling it back and forth does not require much force, which does not increase the overall workload of workers.

[0055] Specific embodiments of the TBM in the utility model:

[0056] TBM can be a main beam TBM or a Kai type TBM. Taking the main beam TBM as an example, Figure 5 and Figure 6 As shown, the TBM includes a cutterhead, a shield, and a main beam. The main beam is equipped with the arch changing device described in the embodiment of the arch changing device for TBM, which will not be described in detail here. For the Kai-type TBM, the above-mentioned arch changing device is installed on the inner camber.

[0057] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An arch replacement device for a TBM, comprising a main platform for installation on the main beam or inner rib of the TBM and a transport vehicle disposed on the main platform and movable forward and backward relative to the main platform, the transport vehicle being provided with a lifting mechanism, the lifting mechanism being provided with an arch support structure for supporting the arch, characterized in that: The lifting stroke of the lifting mechanism is sufficient to press the arch frame on the arch frame support structure tightly against the tunnel wall. The frame of the transport vehicle is provided with at least one support leg that can be folded and lowered. The support leg has a folded state when the transport vehicle moves forward and backward, and also has a lowered state when the transport vehicle moves into position and is supported on the main platform to support the transport vehicle.

2. The arch changing device for TBM according to claim 1, characterized in that: At least one supporting leg is provided on each of the left and right sides of the frame.

3. The arch changing device for TBM according to claim 2, characterized in that: The supporting legs are of a swinging type, and the frame is provided with a limiting structure for cooperating with the supporting legs to limit them to remain in a retracted state.

4. The arch changing device for TBM according to claim 3, characterized in that: The swing axis of the support leg extends in the front-rear direction.

5. The arch changing device for TBM according to claim 3, characterized in that: The limiting structure includes a limiting plate fixed to the frame. The arch changing device also includes a detachable fastener for connecting the support leg and the limiting plate when the support leg is in a retracted state. The support leg and the limiting plate are respectively provided with mounting holes for installing the detachable fastener.

6. The arch changing device for TBM according to any one of claims 1 to 5, characterized in that: The lifting mechanism comprises a telescopic driving device and a guide column which is installed on the vehicle frame along the vertical direction. The telescopic output end of the telescopic driving device is connected to the guide column.

7. The arch changing device for TBM according to any one of claims 1 to 5, characterized in that: The frame is a box-shaped structure with an opening on the top. A part of the lifting mechanism is located inside the frame, and a channel is provided on the frame for the pipelines connected to the lifting mechanism to pass through.

8. The arch changing device for TBM according to any one of claims 1 to 5, characterized in that: The main platform includes tracks arranged at intervals on the left and right for guiding the transport vehicle forward and backward, and a working platform for workers to perform arch replacement operations is fixed on the tracks.

9. The arch changing device for TBM according to any one of claims 1 to 5, characterized in that: The transport vehicle is equipped with a travel drive mechanism for driving the transport vehicle to move forward and backward. The vehicle frame is also equipped with a cover plate for shielding the travel drive mechanism throughout the entire journey of the transport vehicle moving forward and backward.

10. A TBM comprising a main beam or inner keel, characterized in that: The arch-changing device for TBM according to any one of claims 1 to 9 is installed on the main beam or the inner deck.

Images