Method for turning on a bridge of a bridge-launching machine

Abstract

The present application relates to a kind of bridge erecting machine bridge turning method, two beam transporters are used to carry bridge erecting machine as a whole in bridge return beam lifting area, two beam transporters support bridge erecting machine, remove each support leg, use beam lifting area gantry crane to transport each support leg forwards and backwards, with the original front end of bridge erecting machine as rear end, original rear end as front end, re-install each support leg;Finally, by each support leg support bridge erecting machine girder, beam transporter exits bridge erecting machine bottom, complete bridge erecting machine bridge turning.The present application realizes bridge erecting machine bridge turning by using existing beam transporter on bridge and beam lifting area span pier gantry crane, construction speed is fast, and does not need to increase equipment and material cost.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to the use of a bridge erecting machine for bridge construction, and more specifically to a method for turning the bridge erecting machine around on a bridge. Background Technology

[0002] When using a bridge erecting machine for bidirectional bridge construction, after completing the erection of the first directional box girder, the machine needs to return to the beam-lifting station to turn around and begin erecting the second directional box girder. A bridge erecting machine typically consists of a main girder, with front, middle, and rear support legs and a front auxiliary support leg at the bottom, and a front and rear trolley at the top. A common method for turning a bridge erecting machine is to place the entire machine on a ground-based beam-transporting vehicle, and then turn the machine around using the vehicle. For example, patent CN111945574A discloses a whole-machine in-situ turning device and method for a bridge erecting machine. However, this method requires a large footprint and is only suitable for turning around on the ground, not on a bridge.

[0003] Patent CN112095473A discloses a method for turning around a double-guide beam bridge erecting machine. This method utilizes the symmetrical arrangement of the main beam at both ends of the bridge erecting machine, adding an auxiliary middle support leg between the front and middle supports. This auxiliary middle support leg, along with the middle support leg, supports the main beam of the bridge erecting machine. The front and rear supports are then disassembled and their positions reversed. This method can enable the bridge erecting machine to turn around on the bridge, but it is only suitable for small bridge erecting machines. For large bridge erecting machines with a capacity of thousands of tons, the large cantilever of the main beam during the turning process poses a significant construction risk. Furthermore, this method requires the additional fabrication of a set of auxiliary middle supports, increasing construction costs. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a method for turning a bridge erecting machine on the bridge, which enables the bridge erecting machine to turn on the bridge without increasing costs.

[0005] The technical solution of the present invention is as follows:

[0006] A method for turning a bridge erecting machine on a bridge, the bridge erecting machine comprising a main beam, with front support legs, middle support legs, rear support legs and front auxiliary support legs respectively provided on both sides of the bottom of the main beam, and two overhead cranes provided on the top of the main beam, characterized by comprising the following steps:

[0007] (1) Use two beam transport vehicles to carry the bridge erecting machine back to the beam lifting area on the bridge. The two beam transport vehicles are equipped with pads to support the bridge erecting machine. First, support the middle support leg and the rear support leg on the beam surface, and suspend the front support leg and the front auxiliary support leg in the air.

[0008] (2) Remove the front auxiliary legs and front legs, then move the two cars to the inner side of the piers on the two beam transport cars respectively, and then remove the middle legs and rear legs.

[0009] (3) Use the gantry crane across the pier in the lifting area to lift each leg, and swap the front and rear positions of each leg on the main beam. Use the original front end of the main beam as the rear end and the original rear end as the front end. Then install the front auxiliary leg and the rear leg at the front and rear ends of the main beam respectively. Place the front leg and the middle leg in place but do not install them yet.

[0010] (4) The beam transport vehicle moves forward to carry the bridge erecting machine and supports the front auxiliary legs to the top of the pier;

[0011] (5) Install the front outrigger, move the front outrigger forward to the top of the pier, install the front outrigger extension section and anchor it to the concrete support at the top of the pier.

[0012] (6) The front trolley is moved forward to the front end of the main beam, and the rear trolley is moved backward to the position of the pad pier directly opposite the rear beam transport vehicle; the front beam transport vehicle is moved backward to its rear end close to the front end of the rear beam transport vehicle, and the middle support leg is installed between the front end of the front beam transport vehicle and the front support leg.

[0013] (7) Move the middle support leg to the front end of the front beam transport vehicle, and support the lower ends of the middle support leg and the rear support leg to the beam surface to bear the force.

[0014] (8) The bridge erecting machine is moved forward to the middle support leg, the pads on the two beam transport vehicles are removed, the two beam transport vehicles are withdrawn from the bottom of the bridge erecting machine, and the bridge erecting machine turns around on the bridge.

[0015] This invention utilizes the existing beam transport vehicle on the bridge to support and carry the bridge erecting machine. By using the gantry crane in the beam lifting area to switch the outrigger positions of the bridge erecting machine, the bridge erecting machine can be turned around on the bridge. Compared with the prior art, this invention can be used for both small bridge erecting machines and large bridge erecting machines with a capacity of thousands of tons. It has a fast construction speed and does not require any additional equipment or material costs. Attached Figure Description

[0016] Figure 1 This is a construction flowchart of the present invention;

[0017] Figure 2 This is a schematic diagram showing the state when two beam transport vehicles carry the entire bridge erecting machine to the beam lifting area;

[0018] Figure 3 This is a schematic diagram showing the state of the bridge erecting machine after all its outriggers have been removed;

[0019] Figure 4 This is a schematic diagram showing the installation status of the front auxiliary outriggers and the rear outriggers;

[0020] Figure 5 This is a schematic diagram showing the bridge erecting machine being moved forward by the beam transport vehicle.

[0021] Figure 6 This is a schematic diagram showing the installation of the front outriggers;

[0022] Figure 7 This is a schematic diagram showing the status of the outriggers during installation;

[0023] Figure 8 This is a schematic diagram showing the state of the beam transport vehicle's support piers being removed;

[0024] Figure 9 This is a schematic diagram showing the state of the beam transport vehicle after it has exited under the bridge erecting machine. Detailed Implementation

[0025] The following describes a specific embodiment of the present invention with reference to the accompanying drawings. In this embodiment, the bridge erecting machine includes a main beam 1, with front support legs 2, middle support legs 3, rear support legs 4 and front auxiliary support legs 5 respectively provided on both sides of the bottom of the main beam, and two overhead cranes 6 provided on the top of the main beam. Figure 1 This is a construction flowchart of the present invention, and the specific construction steps are as follows:

[0026] (1) As Figure 2 As shown, after the bridge erecting machine completes the erection of the first beam in the direction of the bridge erection machine, it is transported back to the lifting area by two beam transport vehicles 7 on the erected bridge. The two beam transport vehicles 7 are respectively equipped with piers 8 to support the main beam 1 of the bridge erecting machine; first, the middle support leg 3 and the rear support leg 4 are supported on the beam surface, while the front support leg 1 and the front auxiliary support leg 5 are suspended in the air.

[0027] (2) Figure 3 As shown, the front auxiliary support leg 5 and the front support leg 1 are removed. Then, the two trolleys 6 are moved to the inner upper sides of the two beam transport piers, and then the middle support leg 3 and the rear support leg 5 are removed. Since the removal of the middle support leg 3 and the rear support leg 5 will result in long cantilever sections at both ends of the main beam 1, the two trolleys are moved to the inner upper sides of the two beam transport piers before the middle support leg 3 and the rear support leg 5 are removed to act as counterweights and prevent the cantilever sections of the main beam from deflecting.

[0028] (3) Figure 4 As shown, the gantry crane 9 in the beam-lifting area is used to lift and move each outrigger. The front and rear positions of each outrigger on the bridge erecting machine are then reversed, and the front and rear ends of the bridge erecting machine are redefined. The original front end of the main beam is used as the rear end, and the original rear end as the front end. Then, the front auxiliary outrigger 5 and the rear outrigger 4 are reinstalled at the front and rear ends of the main beam. The front and middle outriggers are placed in their positions but not installed yet. In the following description, "front" and "rear" refer to the front and rear directions after the bridge erecting machine has been redefined.

[0029] (4) Figure 5 As shown, the bridge erecting machine is moved forward by the beam transport vehicle 7, and the front auxiliary leg 5 is supported on the top of the pier 10.

[0030] (5) Figure 6 As shown, install the front outrigger 2, move the front outrigger 2 forward to the top of the pier, install the front outrigger extension section and anchor it to the concrete support at the top of the pier.

[0031] (6) Figure 7As shown, the front girder 6 is moved forward to the front end of the main beam 1, and the rear girder 6 is moved backward to the position of the pad 8 directly opposite the rear girder transport vehicle 7; the front girder transport vehicle 7 is moved backward to its rear end close to the front end of the rear girder transport vehicle; the middle support leg 3 is installed between the front end of the front girder transport vehicle and the front support leg.

[0032] (7) Figure 8 As shown, the middle support leg 3 is moved to the front end of the front beam transport vehicle 7, and the lower ends of the middle support leg 3 and the rear support leg 4 are simultaneously supported on the beam surface to bear the force.

[0033] (8) Figure 9 As shown, the second-stage vehicle 7 moves forward to above the middle support leg 3, removes the pad 8 on the beam transport vehicle, and the two beam transport vehicles 7 exit the bottom of the bridge erecting machine, completing the bridge erecting machine's turnaround on the bridge.

Claims

1. A method for turning a bridge erecting machine on a bridge, the bridge erecting machine comprising a main beam, with front support legs, middle support legs, rear support legs, and front auxiliary support legs respectively provided on both sides of the bottom of the main beam, and two overhead cranes provided on the top of the main beam, characterized in that, Includes the following steps: (1) Use two beam transport vehicles to carry the bridge erecting machine back to the beam lifting area on the bridge. The two beam transport vehicles are equipped with pads to support the bridge erecting machine. First, support the middle support leg and the rear support leg on the beam surface, and suspend the front support leg and the front auxiliary support leg in the air. (2) Remove the front auxiliary legs and front legs, then move the two cars to the inner side of the piers on the two beam transport cars respectively, and then remove the middle legs and rear legs. (3) Use the gantry crane across the pier in the lifting area to lift each leg, and swap the front and rear positions of each leg on the main beam. Use the original front end of the main beam as the rear end and the original rear end as the front end. Then install the front auxiliary leg and the rear leg at the front and rear ends of the main beam respectively. Place the front leg and the middle leg in place but do not install them yet. (4) The beam transport vehicle moves forward to carry the bridge erecting machine and supports the front auxiliary legs to the top of the pier; (5) Install the front outrigger, move the front outrigger forward to the top of the pier, install the front outrigger extension section and anchor it to the concrete support at the top of the pier. (6) The front trolley is moved forward to the front end of the main beam, and the rear trolley is moved backward to the position of the pad pier directly opposite the rear beam transport vehicle; the front beam transport vehicle is moved backward to its rear end close to the front end of the rear beam transport vehicle, and the middle support leg is installed between the front end of the front beam transport vehicle and the front support leg. (7) Move the middle support leg to the front end of the front beam transport vehicle, and support the lower ends of the middle support leg and the rear support leg to the beam surface to bear the force. (8) The bridge erecting machine is moved forward to the middle support leg, the pads on the two beam transport vehicles are removed, the two beam transport vehicles are withdrawn from the bottom of the bridge erecting machine, and the bridge erecting machine turns around on the bridge.

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