Method for transporting bridge girder carrying vehicle and bridge erecting machine as a whole through a tunnel

Abstract

The present application provides a kind of method of whole bridge girder carrying vehicle and carrying frame through tunnel, method uses to bridge girder carrying vehicle and carrying support;Method includes the following steps: step S1, front carrying support is hoisted and fixed on front bridge girder carrying vehicle, rear carrying support is hoisted and fixed on rear bridge girder carrying vehicle;Step S2, rear support leg is folded up, front bridge girder carrying vehicle and rear bridge girder carrying vehicle are driven to between middle support leg and rear support leg, rear support leg is folded and supported on beam surface;Step S3, middle support leg is contracted from ground, front lifting trolley drives middle support leg to move to the position close to front support leg, and middle support leg is supported in place;Step S4, front bridge girder carrying vehicle and rear bridge girder carrying vehicle are respectively walked to carrying position;Step S5, front support leg, middle support leg and rear support leg of bridge girder erecting machine are alternately lowered, and machine arm is placed on carrying support;Step S6, middle support leg is contracted and suspended, middle support leg is rotated relative to machine arm, and is fixed;Front support leg, rear support leg and front auxiliary support leg are all contracted from ground.The efficiency of bridge girder erecting machine transfer is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of bridge girder erection machine, and particularly relates to a method for carrying a bridge girder erection machine as a whole through a tunnel by a girder carrying vehicle. BACKGROUND

[0002] The bridge girder erection machine is a device for placing prefabricated girder pieces onto prefabricated piers. The bridge girder erection machine belongs to the category of cranes because its main function is to lift girder pieces and then place them down at the position. The bridge girder erection machine is transported to the construction site by road during use, and can be put into construction after on-site assembly and debugging. The bridge girder erection machine has absolute advantages in high-speed railway construction, and has high construction efficiency, speed, safety, reliability, automation degree and applicability, and complete safety protection measures.

[0003] However, in mountainous areas, there are many tunnels through mountains. In the prior art, the bridge girder erection machine needs to be disassembled and installed, which has a huge workload and is relatively complicated and inefficient. Not only is the tunnel passing cost high, but also the construction period is greatly affected.

[0004] Therefore, it is necessary to provide an improved technical solution for the above-mentioned deficiencies in the prior art. SUMMARY

[0005] The present application aims to provide a method for carrying a bridge girder erection machine as a whole through a tunnel by a girder carrying vehicle, so as to at least solve the above-mentioned problems in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical solution:

[0007] A method for carrying a bridge girder erection machine as a whole through a tunnel by a girder carrying vehicle, the method uses a girder carrying vehicle and a carrying support, and the girder carrying vehicle supports the bridge girder erection machine through the carrying support;

[0008] The bridge girder erection machine comprises an arm, a rear support leg rotatably arranged on the arm, a middle support leg, a front support leg and a front auxiliary support leg slidably arranged on the arm, and the middle support leg is in rotational cooperation with the arm; and a front hoist trolley and a rear hoist trolley slidably arranged on the arm;

[0009] The girder carrying vehicle comprises a front girder carrying vehicle and a rear girder carrying vehicle;

[0010] The carrying support comprises a front carrying support and a rear carrying support, the front carrying support is fixed on the front girder carrying vehicle, and the rear carrying support is fixed on the rear girder carrying vehicle;

[0011] The method comprises the following steps:

[0012] Step S1, hoisting and fixing the front carrying support on the front girder carrying vehicle and hoisting and fixing the rear carrying support on the rear girder carrying vehicle;

[0013] Step S2: The rear support leg folds up and lifts, and the front beam transport vehicle and the rear beam transport vehicle drive to the space between the middle support leg and the rear support leg. The rear support leg folds up and supports the beam surface.

[0014] Step S3: The middle outrigger retracts and lifts off the ground. The front crane trolley drives the middle outrigger to move to a position close to the front outrigger, and the middle outrigger is in place to provide support.

[0015] Step S4: The front beam transport vehicle and the rear beam transport vehicle travel to the loading position respectively;

[0016] Step S5: The front outrigger, middle outrigger and rear outrigger of the bridge erecting machine are lowered alternately to place the boom onto the transport support.

[0017] Step S6: The middle outrigger retracts and suspends in the air, rotates the middle outrigger 70° relative to the boom, and is then fixed; the front outrigger, rear outrigger, and front auxiliary outrigger all retract and lift off the ground, completing the preparation for passing through the tunnel.

[0018] In the method described above for transporting the entire bridge erecting machine through a tunnel using a beam transport vehicle, preferably, in step S2, the front and rear lifting trolleys move to positions close to the front outriggers to balance the weight of the bridge erecting machine when the rear outriggers are folded up.

[0019] In the method described above for transporting the entire bridge erecting machine across a tunnel using a beam transport vehicle, preferably, in step S3, the rear crane trolley retracts to a position close to the rear outrigger, the front crane trolley retracts to the position of the middle outrigger, and the front crane trolley and the middle outrigger are locked together by a pin.

[0020] In the method described above for transporting the entire bridge erecting machine through a tunnel by a beam transport vehicle, preferably, in step S4, the front lifting trolley cooperates to remove the lower crossbeam and support reaction sensor of the front outrigger and places them on the lower crossbeam of the middle outrigger to prepare for transport.

[0021] In the method described above for transporting the bridge erecting machine as a whole through a tunnel using a beam transport vehicle, preferably, in step S5, the rear crane trolley moves to the rear of the rear transport support, and the front crane trolley moves to the front of the rear transport support; at the same time, the lifting device on the crane trolley is lowered and connected to the rear beam transport vehicle.

[0022] In the method described above for transporting the bridge erecting machine as a whole through a tunnel using a beam transport vehicle, preferably, both the front and rear transport supports include a lower beam, which is used to fix the beam transport vehicle.

[0023] Two inner columns are arranged side by side on both sides of the lower beam;

[0024] The upper beam is a U-shaped structure, with its two vertical sides respectively fitted onto two inner columns to guide the upper beam to move along the inner columns.

[0025] A hydraulic mechanism is provided, which is located between the horizontal side of the upper beam and the lower beam in the U-shape. The hydraulic mechanism is used to push the upper beam to move up and down.

[0026] A bolster is provided on the horizontal side of the U-shaped support structure and is used to support the boom of the bridge erecting machine.

[0027] The transport support is in a low position.

[0028] In the method described above for a beam transport vehicle to carry a bridge erecting machine through a tunnel, preferably, the transport support also includes a diagonal bracing mechanism, which is disposed between the horizontal side of the upper beam and the lower beam of the portal frame; the diagonal bracing mechanism includes a double-ended stud and two threaded sleeves, the two threaded sleeves being respectively hinged to the horizontal side of the upper beam and the lower beam of the portal frame, and the double-ended studs being threadedly assembled in the two threaded sleeves.

[0029] In the method described above for transporting the bridge erecting machine as a whole through a tunnel using a beam transport vehicle, preferably, the boom is provided with a through hole, and a limit rod is provided inside the through hole for guidance.

[0030] The limiting rod has an annular boss facing upwards, and an annular step is provided at the top of the through hole. The annular step and the annular boss cooperate to prevent the limiting rod from coming out of the through hole.

[0031] A cover plate is provided at the bottom of the perforation, and a compression spring is provided between the cover plate and the annular boss of the limiting rod.

[0032] A pull rod is provided at one end of the limiting rod facing the cover plate, and a through hole is provided on the cover plate, through which the pull rod extends out of the cover plate.

[0033] In the method described above for transporting the bridge erecting machine across a tunnel using a beam transport vehicle, preferably, an annular groove is provided on the lower end face of the middle support leg, the portion of the limiting rod extending out of the arm is located in the annular groove, and the limiting rod is guided and slid in the annular support.

[0034] The bottom of the ring support is provided with a limiting hole. When the limiting hole rotates to be opposite to the limiting rod, the limiting rod is pushed into the limiting hole under the elastic force of the compression spring.

[0035] In the method described above for transporting the bridge erecting machine across a tunnel using a beam transport vehicle, preferably, a connecting rod is provided between the middle support leg and the boom, with one end of the connecting rod hinged to the middle support leg and the other end hinged to the boom.

[0036] Beneficial effects:

[0037] In this method of transporting the entire bridge erecting machine through a tunnel using a beam transport vehicle, the middle support is moved to the front of the boom, ensuring that the front and middle outriggers are the closest to entering and the first to exit the tunnel. Simultaneously, the middle outriggers are rotated 70° relative to the boom, significantly reducing the width of the bridge erecting machine and facilitating its passage through the tunnel, greatly improving transport efficiency. Limiting rods are installed on the boom, and annular grooves are installed on the middle outriggers. These grooves allow the grooves to rotate along the limiting rods, ensuring stable rotation of the middle outriggers and guaranteeing that the middle outriggers remain relatively stationary compared to the boom during transport. Attached Figure Description

[0038] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0039] Figure 1 This is a state diagram of the bridge erecting machine in step S2 of the tunnel crossing method according to an embodiment of the present invention;

[0040] Figure 2 This is a state diagram of the bridge erecting machine in step S3 of the tunnel crossing method according to an embodiment of the present invention;

[0041] Figure 3 This is a state diagram of the bridge erecting machine in step S4 of the tunnel crossing method according to an embodiment of the present invention;

[0042] Figure 4 This is a state diagram of the bridge erecting machine in step S5 of the tunnel crossing method according to an embodiment of the present invention;

[0043] Figure 5 This is a state diagram of the bridge erecting machine in step S6 of the tunnel crossing method according to an embodiment of the present invention;

[0044] Figure 6 This is a cross-sectional view of the limiting rod and limiting hole according to an embodiment of the present invention;

[0045] Figure 7 This is a schematic diagram of the annular groove and limiting hole on the middle support leg according to an embodiment of the present invention;

[0046] Figure 8 This is a schematic diagram of the structure of a transport bracket according to an embodiment of the present invention.

[0047] In the diagram: 1. Arm; 11. Limiting rod; 12. Compression spring; 13. Cover plate; 2. Rear outrigger; 3. Middle outrigger; 31. Annular groove; 32. Limiting hole; 4. Front outrigger; 5. Rear lifting trolley; 6. Front lifting trolley; 7. Rear beam transport vehicle; 71. Lower beam; 72. Inner column; 73. Upper beam; 74. Bolt; 75. Diagonal bracing mechanism; 8. Front beam transport vehicle. Detailed Implementation

[0048] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0049] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0050] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0051] According to specific embodiments of the present invention, such as Figures 1-8 As shown, the present invention provides a method for a beam transport vehicle to carry a bridge erecting machine through a tunnel. The method uses a beam transport vehicle and a carrying support frame, and the beam transport vehicle supports the bridge erecting machine through the carrying support frame.

[0052] The bridge erecting machine includes a boom 1, on which a rear support leg 2 is slidably and rotatably mounted. The boom 1 is also equipped with a middle support leg 3, a front support leg 4 and a front auxiliary support leg, and the middle support leg 3 is also rotatably coordinated with the boom 1. The boom 1 is also slidably equipped with a front lifting trolley 6 and a rear lifting trolley 5.

[0053] The beam transport vehicle includes a front beam transport vehicle 8 and a rear beam transport vehicle 7.

[0054] The transport support includes a front transport support and a rear transport support. The front transport support is fixed on the front beam transport vehicle 8, and the rear transport support is fixed on the rear beam transport vehicle 7.

[0055] The method includes the following steps:

[0056] Step S1: Hoist and fix the front transport bracket onto the front beam transport vehicle 8, and hoist and fix the rear transport bracket onto the rear beam transport vehicle 7.

[0057] In step S2, the rear support leg 2 folds up and is lifted. The front beam transport vehicle 8 and the rear beam transport vehicle 7 travel between the middle support leg 3 and the rear support leg 2, and the rear support leg 2 folds up and supports itself on the beam surface. In step S2, the front lifting trolley 6 and the rear lifting trolley 5 move to a position close to the front support leg 4 to balance the weight of the bridge erecting machine when the rear support leg 2 folds up and is lifted.

[0058] In step S3, the middle support leg 3 retracts and lifts off the ground. The front crane trolley 6 drives the middle support leg 3 to move to a position close to the front support leg 4, where the middle support leg 3 is in position for support. In step S3, the rear crane trolley 5 retracts to a position close to the rear support leg 2, and the front crane trolley 6 retracts to the position of the middle support leg 3, with the front crane trolley 6 and the middle support leg 3 locked together by a pin. This allows the front crane trolley 6 to push the middle support leg 3 towards the front support leg 4. At this time, the middle support leg 3 is located near the front end of the bridge erecting machine. This arrangement ensures that the front support leg 4 and the middle support leg 3 on the front side of the bridge erecting machine are the components that are closest to entering the tunnel and the first to exit the tunnel. Since there is no bridge erection ahead after exiting the tunnel, the space at the tunnel entrance is limited. The middle support leg 3 exiting the tunnel first is more beneficial for subsequent bridge erection operations.

[0059] In step S4, the front beam transport vehicle 8 and the rear beam transport vehicle 7 move to their respective loading positions. In step S4, the front lifting trolley 6 cooperates to remove the lower crossbeam and support reaction sensor of the front outrigger 4 and places them on the lower crossbeam of the middle outrigger 3 to prepare for loading.

[0060] In step S5, the front outrigger 4, middle outrigger 3, and rear outrigger 2 of the bridge erecting machine are lowered alternately, placing the boom 1 onto the transport support. During step S5, the rear lifting trolley 5 moves to the rear of the transport support, and the front lifting trolley 6 moves to the front of the transport support; simultaneously, the lifting device on the lifting trolley is lowered and connected to the rear beam transport trolley 7. This provides better fixation for the lifting trolleys and also better balances the overall weight of the bridge erecting machine; at this time, the transport support is in a low position.

[0061] In step S6, the middle outrigger 3 retracts and suspends in the air, rotates the middle outrigger 3 70° relative to the boom 1, and fixes it; the front outrigger 4, the rear outrigger 2, and the front auxiliary outrigger all retract and leave the ground, completing the preparation for passing through the tunnel.

[0062] In the method of transporting the bridge erecting machine through the tunnel by the beam transport vehicle, the middle support is moved to the front side of the boom 1 so that the front support leg 4 and the middle support leg 3 are the closest to enter the tunnel and the first to exit the tunnel; at the same time, the middle support leg 3 is rotated by 70° to the boom 1, which greatly reduces the width of the bridge erecting machine and makes it easier for the bridge erecting machine to pass through the tunnel as a whole.

[0063] Both the front and rear transport supports include a lower beam 71, which is used to fix the beam transport vehicle. In this embodiment, a threaded steel bar passes through the lower beam 71 and the beam transport vehicle. Washers and nuts are provided at both ends of the threaded steel bar. The nuts are screwed onto the threaded steel bar and press the washers to firmly fix the lower beam 71 and the beam transport vehicle together.

[0064] Two inner columns 72 are arranged side by side on both sides of the lower beam 71.

[0065] The upper beam 73 has a door-shaped structure. The two vertical sides of the door-shaped upper beam 73 are respectively fitted onto the two inner columns 72 so that the upper beam 73 can move along the inner columns 72.

[0066] The hydraulic mechanism is located between the horizontal side of the upper beam 73 and the lower beam 71 in a portal-shaped configuration. The hydraulic mechanism is used to push the upper beam 73 to move up and down.

[0067] A bolster 74 is installed on the horizontal side of the U-shaped bridge support and is used to support the boom 1 of the bridge erecting machine.

[0068] The transport support is in a low position.

[0069] In one embodiment of this application, the upper beam 73 of the carrying support is in the lowest position on the inner column 72, and the inclined groove mechanism is locked to facilitate the bridge erecting machine to pass through the tunnel.

[0070] The carrying support also includes a diagonal bracing mechanism 75, which is located between the horizontal side of the upper beam 73 and the lower beam 71. The diagonal bracing mechanism 75 includes a double-ended stud and two threaded sleeves, which are respectively hinged to the horizontal side of the upper beam 73 and the lower beam 71. The double-ended threads are simultaneously threaded into the two threaded sleeves.

[0071] In one embodiment of this application, the two ends of the double-ended stud have opposite threads, and the double-ended stud is configured to cooperate with two threaded sleeves, which makes it easier to quickly adjust the length of the inclined slot mechanism.

[0072] The arm 1 is provided with a through hole, and a limit rod 11 is provided inside the through hole as a guide.

[0073] The limiting rod 11 has an annular boss on its ring side, and an annular step is provided on the top of the through hole. The annular step and the annular boss cooperate to stop and prevent the limiting rod 11 from coming out of the through hole.

[0074] A cover plate 13 is provided at the bottom of the perforation, and a compression spring 12 is provided between the cover plate 13 and the annular boss of the limiting rod 11.

[0075] A pull rod is provided at one end of the limiting rod 11 facing the cover plate 13. A through hole is provided on the cover plate 13, and the pull rod extends out of the cover plate 13 through the through hole.

[0076] An annular groove 31 is provided on the lower end face of the middle support leg 3. The part of the limiting rod 11 extending out of the arm 1 is located in the annular groove 31, and the limiting rod 11 is guided and slid in the annular support.

[0077] The bottom of the ring support is provided with a limiting hole 32. When the limiting hole 32 rotates to be opposite to the limiting rod 11, the limiting rod 11 is pushed into the limiting hole 32 under the elastic force of the compression spring 12.

[0078] In this embodiment, a limiting rod 11 is provided on the boom 1, and an annular groove 31 is provided on the middle support leg 3. First, the annular groove 31 can rotate along the limiting rod 11, making the rotation of the middle support leg 3 more stable. In addition, a limiting hole 32 is provided at the bottom of the annular groove 31. When the middle support leg 3 rotates to the set position, the limiting hole 32 is aligned with the limiting rod 11. Under the elastic force of the compression spring 12, the limiting rod 11 is inserted into the limiting hole 32. At this time, the middle support leg 3 and the boom 1 are relatively fixed, ensuring that the middle support leg 3 remains stable relative to the boom 1 during the bridge erecting machine's transportation process. When it is necessary to release the limiting position between the middle support leg 3 and the boom 1, simply pull down the pull rod at the bottom of the limiting rod 11 to make the limiting rod 11 exit from the limiting hole 32. At this time, the middle support leg 3 can rotate relative to the boom 1.

[0079] A connecting rod is provided between the middle outrigger 3 and the boom 1. One end of the connecting rod is hinged to the middle outrigger 3, and the other end is hinged to the boom 1.

[0080] In one embodiment of this application, after the middle support leg 3 rotates to the position relative to the arm 1, a connecting rod is installed between the middle support leg 3 and the arm 1 to strengthen the limiting relationship between the middle support leg 3 and the arm 1 and prevent the middle support leg 3 from rotating relative to the arm 1; in other embodiments, the connecting rod can also be a hydraulic rod, in which case the middle support leg 3 can be driven to rotate relative to the arm 1 by the hydraulic rod.

[0081] It is understood that the above description is merely exemplary and the embodiments of this application do not limit the scope of the application.

[0082] The above description is merely 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 shall be within the scope of protection of the pending claims of the present invention.

Claims

1. A method for transporting a bridge erecting machine as a whole through a tunnel using a beam transport vehicle, characterized in that, The method uses a beam transport vehicle and a support frame, with the beam transport vehicle supporting the bridge erecting machine via the support frame; The bridge erecting machine includes a boom, on which a rear support leg is rotatably mounted. A middle support leg, a front support leg, and a front auxiliary support leg are also slidably mounted on the boom, and the middle support leg is also rotatably engaged with the boom. A front lifting trolley and a rear lifting trolley are also slidably mounted on the boom. The beam transport vehicle includes a front beam transport vehicle and a rear beam transport vehicle; The transport support includes a front transport support and a rear transport support. The front transport support is fixed on the front beam transport vehicle, and the rear transport support is fixed on the rear beam transport vehicle. The method includes the following steps: Step S1: Hoist and fix the front transport bracket to the front beam transport vehicle, and hoist and fix the rear transport bracket to the rear beam transport vehicle. Step S2: The rear support leg folds up and lifts, and the front beam transport vehicle and the rear beam transport vehicle drive to the space between the middle support leg and the rear support leg. The rear support leg folds up and supports the beam surface. Step S3: The middle outrigger retracts and lifts off the ground. The front crane trolley drives the middle outrigger to move to a position close to the front outrigger, and the middle outrigger is in place to provide support. Step S4: The front beam transport vehicle and the rear beam transport vehicle travel to the loading position respectively; Step S5: The front outrigger, middle outrigger and rear outrigger of the bridge erecting machine descend alternately, placing the boom on the transport support; at this time, the transport support is in a low position. Step S6: The middle outrigger retracts and suspends in the air, rotates the middle outrigger 70° relative to the boom, and is then fixed; the front outrigger, rear outrigger, and front auxiliary outrigger all retract and lift off the ground, completing the preparation for passing through the tunnel.

2. The method for transporting a bridge erecting machine as a whole through a tunnel using a beam transport vehicle according to claim 1, characterized in that, In step S2, the front and rear lifting trolleys move to positions close to the front outriggers to balance the weight of the bridge erecting machine when the rear outriggers fold up.

3. The method for transporting a bridge erecting machine as a whole through a tunnel using a beam transport vehicle according to claim 2, characterized in that, In step S3, the rear crane trolley moves back to a position close to the rear outrigger, and the front crane trolley moves back to the position of the middle outrigger, with the front crane trolley and the middle outrigger locked together by a pin.

4. The method for transporting a bridge erecting machine as a whole through a tunnel using a beam transport vehicle according to claim 3, characterized in that, In step S4, the front crane trolley works together to remove the lower crossbeam and support reaction sensor of the front outrigger and place them on the lower crossbeam of the middle outrigger to prepare for loading.

5. The method for transporting a bridge erecting machine as a whole through a tunnel using a beam transport vehicle according to claim 4, characterized in that, In step S5, the rear crane trolley moves to the rear of the rear transport support, and the front crane trolley moves to the front of the rear transport support; at the same time, the lifting device on the crane trolley is lowered and connected to the rear beam transport vehicle.

6. The method for transporting a bridge erecting machine as a whole through a tunnel using a beam transport vehicle according to claim 1, characterized in that, Both the front and rear transport supports include a lower beam, which is used to fix the beam transport vehicle. Two inner columns are arranged side by side on both sides of the lower beam; The upper beam is a U-shaped structure, with its two vertical sides respectively fitted onto two inner columns to guide the upper beam to move along the inner columns. A hydraulic mechanism is provided, which is located between the horizontal side of the upper beam and the lower beam in the U-shape. The hydraulic mechanism is used to push the upper beam to move up and down. A bolster is provided on the horizontal side of the U-shaped support structure and is used to support the boom of the bridge erecting machine.

7. The method for transporting a bridge erecting machine as a whole through a tunnel using a beam transport vehicle according to claim 6, characterized in that, The carrying support also includes a diagonal bracing mechanism, which is set between the horizontal side of the upper beam and the lower beam of the portal frame. The diagonal bracing mechanism includes a double-ended stud and two threaded sleeves, which are respectively hinged to the horizontal side of the upper beam and the lower beam of the portal frame. The double-ended stud is threaded into the two threaded sleeves.

8. The method for transporting a bridge erecting machine as a whole through a tunnel using a beam transport vehicle according to claim 1, characterized in that, The arm is provided with a through hole, and a limit rod is provided inside the through hole for guidance. The limiting rod has an annular boss facing upwards, and an annular step is provided at the top of the through hole. The annular step and the annular boss cooperate to prevent the limiting rod from coming out of the through hole. A cover plate is provided at the bottom of the perforation, and a compression spring is provided between the cover plate and the annular boss of the limiting rod. A pull rod is provided at one end of the limiting rod facing the cover plate, and a through hole is provided on the cover plate, through which the pull rod extends out of the cover plate.

9. The method for transporting a bridge erecting machine as a whole through a tunnel using a beam transport vehicle according to claim 8, characterized in that, An annular groove is provided on the lower end face of the middle support leg, and the part of the limiting rod extending out of the arm is located in the annular groove, and the limiting rod slides in the annular groove. The bottom of the annular groove is provided with a limiting hole. When the limiting hole rotates to be opposite to the limiting rod, the limiting rod is pushed into the limiting hole under the elastic force of the compression spring.

10. The method for transporting a bridge erecting machine as a whole through a tunnel using a beam transport vehicle according to any one of claims 1-9, characterized in that, A connecting rod is provided between the middle outrigger and the machine arm. One end of the connecting rod is hinged to the middle outrigger, and the other end is hinged to the machine arm.

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