CN112874417B - Bridge girder erection machine transition system and bridge girder erection machine transition method - Google Patents
Bridge girder erection machine transition system and bridge girder erection machine transition method Download PDFInfo
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- CN112874417B CN112874417B CN202110081390.XA CN202110081390A CN112874417B CN 112874417 B CN112874417 B CN 112874417B CN 202110081390 A CN202110081390 A CN 202110081390A CN 112874417 B CN112874417 B CN 112874417B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
- B60P3/00—Vehicles adapted to transport, to carry or to comprise special loads or objects
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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Abstract
The invention discloses a transfer system of a bridge girder erection machine, which comprises the bridge girder erection machine and a transportation device. The bridge girder erection machine comprises a main guide beam, a front supporting leg, a middle support, a rear supporting leg and an overhead traveling crane, wherein the front supporting leg, the rear support, the middle support and the rear supporting leg are sequentially arranged on the main guide beam, and the overhead traveling crane is arranged at the top of the main guide beam. The transportation device comprises a main beam transporting vehicle and an auxiliary beam transporting vehicle, the middle support is borne on the main beam transporting vehicle, and the front support legs are borne on the auxiliary beam transporting vehicle. The invention also discloses a transfer method of the bridge girder erection machine. According to the bridge girder erection machine transition system and the bridge girder erection machine transition method, the whole bridge girder erection machine is slowly transported to a destination through the power of the main girder transport vehicle and the auxiliary girder transport vehicle, the bridge girder erection machine does not need to be disassembled and assembled, the risk of mounting and dismounting the bridge girder erection machine can be reduced, and the transition efficiency is improved.
Description
Technical Field
The invention relates to the technical field of highway construction, in particular to a bridge girder erection machine transition system and a bridge girder erection machine transition method.
Background
In the construction of highway construction, need transport the bridge girder erection machine after the frame roof beam is accomplished. At present, for the transportation of a bridge girder erection machine, the bridge girder erection machine is driven to a bridge head roadbed in a walking way for dismantling, the dismantled parts are transported to the next erection area through a flat car for installation again, and the parts are put into use after the installation is finished.
The construction process has the advantages that the number of bridges is small, the distance between the roadbed and the operation environment in a plain area is long, and the construction process for dismantling, transferring and installing the bridge girder erection machine in a transition field is carried out according to basic requirements. However, in the construction of hills and mountain areas, the number of bridges is large, the roadbed distance is short, and no access way is provided in partial areas. Therefore, the mounting and dismounting frequency of the bridge girder erection machine is high, the mounting and dismounting work efficiency is low according to the traditional transition method of the bridge girder erection machine, and the construction cost is increased.
Disclosure of Invention
Therefore, the transfer system and the transfer method of the bridge girder erection machine are needed to be provided for solving the problems that the traditional transfer method of the bridge girder erection machine is low in installation and disassembly work efficiency and increases construction cost.
A bridge girder erection machine transition system, comprising:
the bridge girder erection machine comprises a main guide beam, a front support leg, a middle support, a rear support leg and an overhead traveling crane, wherein the front support leg, the rear support, the middle support and the rear support leg are sequentially arranged on the main guide beam, and the overhead traveling crane is arranged at the top of the main guide beam; and
the transportation device comprises a main beam transporting vehicle and an auxiliary beam transporting vehicle, the middle support is borne on the main beam transporting vehicle, and the front support legs are borne on the auxiliary beam transporting vehicle.
In one embodiment, the walking protection device comprises a rear protection walking wheel and a front protection walking wheel, the rear protection walking wheel is installed on the rear supporting leg, and the front protection walking wheel is installed on the front supporting leg.
In one embodiment, the distance between the front protective walking wheel and the ground is not more than 200mm, and the distance between the rear protective walking wheel and the ground is not more than 200 mm.
In one embodiment, the middle support is fixed on the main guide beam through a hoop, and a winch of the overhead travelling crane is used for hoisting the cross beam of the middle support and tightening and fixing the cross beam.
In one embodiment, the number of the crown blocks is two, namely a front crown block and a rear crown block, the rear crown block is positioned above the main girder transporting vehicle, and the front crown block is positioned above the auxiliary girder transporting vehicle.
A bridge girder erection machine transition method comprises a main guide beam, a front support leg, a middle support, a rear support leg and a crown block, wherein the front support leg, the middle support, the rear support leg and the rear support leg are sequentially arranged on the main guide beam, the crown block is arranged at the top of the main guide beam, and the transition method comprises the following steps:
moving the rear support between the middle support and the front supporting leg, and then fixing the middle support;
the main girder is jacked up by the rear support and the front supporting legs, and after a main girder transporting vehicle is in place, the rear support and the front supporting legs are contracted to bear the middle support on the main girder transporting vehicle;
moving the rear support to the front supporting legs, then jacking the main girder by the rear support, contracting the front supporting legs, and bearing the front supporting legs on the auxiliary girder transporting vehicle by the rear support after the auxiliary girder transporting vehicle is in place;
and transporting the whole bridge girder erection machine to a destination through the main girder transporting vehicle and the auxiliary girder transporting vehicle.
In one embodiment, the step of moving the rear bracket between the middle bracket and the front leg and then fixing the middle bracket further comprises:
and moving the middle support to the rear support, wherein after the middle support is moved, the distance between the middle support and the front support leg is twice as long as the distance between the middle support and the rear support leg.
In one embodiment, the step of fixing the middle support specifically includes:
and fixing the middle support on the main guide beam by adopting a hoop, and hoisting the cross beam of the middle support by using a hoist of the crown block to tighten and fix.
In one embodiment, after the main guide beam is jacked up by the rear support and the front supporting legs, the rear supporting legs lift off, and rear protective travelling wheels are installed on the rear supporting legs; and/or
The rear support jacks the main guide beam, and the front support legs are provided with front support protective travelling wheels after being contracted.
In one embodiment, the step of retracting the rear tray to drop the front legs onto the secondary girder transport vehicle further comprises:
and fixing the main girder with the main girder transporting vehicle and the auxiliary girder transporting vehicle through a hoist and a steel wire rope, wherein the two steel wire ropes connected with the main girder are crossed with each other.
According to the bridge girder erection machine transition system and the bridge girder erection machine transition method, the middle support of the bridge girder erection machine is borne on the main girder transport vehicle through the rear support of the bridge girder erection machine, the front support leg of the bridge girder erection machine is borne on the auxiliary girder transport vehicle, the whole bridge girder erection machine is slowly transported to a destination through the power of the main girder transport vehicle and the auxiliary girder transport vehicle, the bridge girder erection machine does not need to be detached and then assembled, the mounting and dismounting risks of the bridge girder erection machine can be reduced, and the transition efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings, which are required to be used in the embodiments, will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.
FIG. 1 is a schematic structural diagram of a transfer system of a bridge girder erection machine according to an embodiment;
FIG. 2 is a schematic view of the rear bracket of FIG. 1 mounted to a main guide beam;
FIG. 3 is a schematic view of the rear leg of FIG. 1 mounted to the main guide beam;
FIG. 4 is a schematic view of the center sill of FIG. 1 carried on a main girder truck;
FIG. 5 is a schematic view of the front leg of FIG. 1 carried on a secondary girder transport vehicle;
FIG. 6 is a flow chart of a bridge girder approach to transition in one embodiment;
FIG. 7 is a schematic view of the bridge girder erection machine in an initial state;
fig. 8 is a schematic view of the rear tray moving between the front legs and the center tray.
Reference numerals:
11-main guide beam, 12-front support leg, 13-middle support, 14-rear support, 15-rear support leg, 16-crown block, 22-main beam carrier, 24-auxiliary beam carrier, 32-rear protective road wheel, 34-front protective road wheel, 42-hoist and 44-steel wire rope.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, the bridge girder erection machine transition system according to an embodiment is only suitable for a construction scene where prefabricated beams, such as box beams, T beams, I beams, U beams, and other erection areas are scattered and transition lines are flat. Specifically, the bridge girder erection machine transition system comprises a bridge girder erection machine and a transportation device.
Referring to fig. 2 and 3, the bridge girder erection machine includes a main girder 11, a front leg 12, a middle bracket 13, a rear bracket 14, a rear leg 15 and a crown block 16. The front supporting legs 12, the rear support 14, the middle support 13 and the rear supporting legs 15 are sequentially arranged on the main guide beam 11, the front supporting legs 12 and the rear supporting legs 15 are respectively positioned at two ends of the main guide beam 11, the middle support 13 is positioned in the middle of the main guide beam 11, the rear support 14 is positioned between the middle support 13 and the front supporting legs 12, and the overhead traveling crane 16 is arranged at the top of the main guide beam 11.
In one embodiment, the distance between the middle bracket 13 and the front leg 12 is twice the distance between the middle bracket 13 and the rear leg 15, the middle bracket 13 rests at 1/3 on the main guide beam, and the rear bracket 14 is located near the front leg 12. The middle support 13 is fixed on the main guide beam 11 through a hoop, and a winch of the crown block 16 is used for hoisting the cross beam of the middle support 13 and appropriately tightening and fixing the cross beam so as to integrate the middle support 13 with the main guide beam 11. The number of the crown blocks 16 is two, and the crown blocks are respectively a front crown block and a rear crown block, the front crown block is positioned above the front supporting leg 12, the rear crown block is positioned above the middle support 13, and a winch of the rear crown block is used for hoisting a cross beam of the middle support 13.
Referring to fig. 4 and 5, the transportation device includes a main girder transporter 22 and a sub girder transporter 24, wherein the middle pallet 13 is supported on the main girder transporter 22, and the front support legs 12 are supported on the sub girder transporter 24. Specifically, the cross member of the center pallet 13 is carried on the main girder trolley 22, and the cross member of the front leg 12 is carried on the sub girder trolley 24. In one embodiment, in order to prevent the bridge girder erection machine from being detached from the girder trucks 22 and 24, the bridge girder erection machine needs to be fixed to the girder trucks 22 and 24.
Specifically, each main girder 11 is fixed with the main girder transporting vehicle 22 and the auxiliary girder transporting vehicle 24 through a hoist 42 and a steel wire rope 44, and the steel wire ropes 44 connected with the two main girders 11 are crossed with each other to fix the bridge girder erection machine. The hoist 42 is connected with the main girder 11, the two ends of the steel wire rope 44 are connected with the hoist 42 and the main girder of the girder transporting vehicle, the pre-tightening force of the steel wire rope 44 can be adjusted by the hoist 42, and the bridge girder erection machine is guaranteed to be fixed stably. The rear crown block is positioned above the main girder transporting vehicle 22, the front crown block is positioned above the auxiliary girder transporting vehicle 24, the front crown block is fixed on the main girder of the auxiliary girder transporting vehicle 24 through a steel wire rope 44, and the rear crown block is fixed on the main girder of the main girder transporting vehicle 22 through the steel wire rope 44, so that the front crown block and the rear crown block are prevented from shaking in the transporting process.
In one embodiment, the bridge girder erection machine transition system further comprises a walking protection device, and the walking protection device is used for protecting the bridge girder erection machine during the transportation of the bridge girder erection machine. Specifically, the walking protection device comprises a rear protection walking wheel 32 and a front protection walking wheel 34, wherein the rear protection walking wheel 32 is installed on the rear supporting leg 15, and the front protection walking wheel 34 is installed on the front supporting leg 12. The rear protective travelling wheels 32 and the front protective travelling wheels 34 can play a role in temporary supporting and protecting when the bridge girder erection machine deflects, so that the transition safety of the bridge girder erection machine is ensured.
In one embodiment, the number of the front protective travelling wheels 34 and the number of the rear protective travelling wheels 32 are two, so that four-point temporary protection for the front and the rear of the bridge girder erection machine is realized. Front protection road wheel 34 and back protection road wheel 32 all can adopt solid tyre, can adjust the distance from ground, and front protection road wheel 34 is not more than 200mm apart from the distance on ground, and back protection road wheel 32 is not more than 200mm apart from the distance on ground.
Referring to fig. 6 and 7, the present invention further provides a transfer method of a bridge girder erection machine, which adopts the above transfer system of the bridge girder erection machine, wherein when the bridge girder erection machine is in an initial state, a front leg 12, a middle bracket 13, a rear bracket 14 and a rear leg 15 of the bridge girder erection machine are sequentially mounted on the main girder 11. Specifically, the transition method comprises the following steps:
step S110: the rear tray 14 is moved between the middle tray 13 and the front leg 12, and then the middle tray 13 is fixed.
Referring also to fig. 8, specifically, the rear tray 14 needs to be moved between the middle tray 13 and the front legs 12, and the rear tray 14 is stopped near the middle tray 13. Then, the middle support 13 is fixed on the main guide beam 11 by adopting a hoop, and a winch of a crown block 16 is used for hoisting the cross beam of the middle support 13 and appropriately tightening and fixing the cross beam, so that the middle support 13 and the main guide beam 11 form a whole, and the middle support 13 is prevented from moving in the transportation process.
In one embodiment, before the step S110, the transition method further includes: and (4) carrying out site preparation work, compacting and leveling the road surface by adopting a road roller, ensuring the leveling and bearing capacity of the road surface, and then walking the bridge girder erection machine to the compacted road surface.
In one embodiment, before the step S110, the transition method further includes: the middle support 13 is moved to the rear support 14, after the middle support 13 is moved, the distance between the middle support 13 and the front leg 12 is twice the distance between the middle support 13 and the rear leg 15, namely the middle support 13 is parked at 1/3 of the main guide beam, so that the gravity center of the bridge girder erection machine is adjusted, and deflection is avoided in the jacking process of the main guide beam 11. The crown block 16 comprises a front crown block and a rear crown block, the middle support 13 can move through the rear crown block, and a winch of the rear crown block can hoist the cross beam of the middle support 13 and appropriately tighten and fix the cross beam.
Step S120: the main girder 11 is lifted by the rear bracket 14 and the front leg 12, and after the girder vehicle 22 is in place, the rear bracket 14 and the front leg 12 are contracted to be loaded on the girder vehicle 22.
Referring to fig. 1, 4 and 5 again, specifically, the rear bracket 14 has a hydraulic cylinder jacking device, the front supporting leg 12 can be extended and retracted, and the rear bracket 14 and the front supporting leg 12 can simultaneously and horizontally jack the main girder 11 by using the hydraulic cylinder jacking device of the rear bracket 14, so that the height of the middle bracket 13 is higher than that of the main girder transporter 22, for example, 1.4 m. Then the main girder transporting vehicle 22 is driven to the lower part of the middle support 13, the oil cylinder of the rear support 14 is slowly contracted, and the cross beam of the middle support 13 is borne on the main girder transporting vehicle 22.
In one embodiment, after the front supporting legs 12 and the rear support 14 lift the main guide beam 11, the rear supporting legs 15 are lifted off, the rear protective walking wheels 32 are installed on the rear supporting legs 15, and the rear protective walking wheels 32 can play a role in temporary support and protection. The distance between the rear protective walking wheels 32 and the ground is adjusted, and the distance between the rear protective walking wheels 32 and the ground is required to be not more than 200 mm.
Step S130: the rear bracket 14 is moved towards the front leg 12, then the rear bracket 14 jacks up the main girder 11, the front leg 12 is contracted, and after the auxiliary girder transport vehicle 24 is in place, the rear bracket 14 is contracted to bear the front leg 12 on the auxiliary girder transport vehicle 24.
Specifically, after the rear bracket 14 is retracted to carry the middle bracket 13 on the girder 22, the rear bracket 14 cylinder is further retracted, and then the rear bracket 14 is moved to the vicinity of the front leg 12. Wherein, can hoist and mount and move the back support 14 through the front overhead traveling crane. After the rear support 14 moves to the right position, the jacking oil cylinder of the rear support 14 is utilized, the rear support 14 jacks the main guide beam 11, and the oil cylinder of the front support leg 12 contracts, so that the cross beam of the front support leg 12 contracts to be higher than the height of the auxiliary girder transporting vehicle 24, for example, 1.4 meters.
The front supporting leg 12 is well penetrated with a fixed pin shaft which can lock the front supporting leg 12 so as to prevent the front supporting leg 12 from moving in a telescopic way. Then the auxiliary girder transporting vehicle 24 runs to the lower part of the cross beam of the front supporting leg 12, and the oil cylinder of the rear support 14 is slowly contracted, so that the cross beam of the front supporting leg 12 is supported on the auxiliary girder transporting vehicle 24. And finally, adjusting the position of the bridge girder erection machine through the sleepers so as to keep the bridge girder erection machine balanced.
In one embodiment, the rear support 14 jacks the main guide beam 11, the front support leg 12 is retracted, the front support leg 12 is lifted, the front support protective walking wheel 34 is mounted on the front support leg 12, and the front support protective walking wheel 34 can play a role in temporary support and protection. The distance between the front supporting and protecting road wheels 34 and the ground is adjusted, and the distance between the front supporting and protecting road wheels 34 and the ground is required to be not more than 200 mm.
In one embodiment, in order to prevent the bridge girder erection machine from being detached from the girder trucks 22 and 24, the bridge girder erection machine needs to be fixed to the girder trucks 22 and 24. Specifically, the main girder 11 is fixed with the main girder car 22 and the auxiliary girder car 24 through the hoist 42 and the wire rope 44, and the wire ropes 44 connected with the two main girders 11 are crossed with each other to fix the bridge girder erection machine. The hoist 42 is connected with the main girder 11, the two ends of the steel wire rope 44 are connected with the hoist 42 and the main girder of the girder transporting vehicle, the pre-tightening force of the steel wire rope 44 can be adjusted by the hoist 42, and the bridge girder erection machine is guaranteed to be fixed stably. The front crown block is fixed on the main beam of the auxiliary girder transporting vehicle 24 through a steel wire rope 44, and the rear crown block is fixed on the main beam of the main girder transporting vehicle 22 through a steel wire rope 44, so that the front crown block and the rear crown block are prevented from shaking in the transporting process.
Step S140: the entire bridge girder erection machine is transported to a destination by the girder trucks 22 and the secondary girder trucks 24.
Specifically, after the bridge girder erection machine is fixed on the girder transportation vehicle, the main girder transportation vehicle 22 and the auxiliary girder transportation vehicle 24 are started to drive towards the road surface, the driving speed is controlled to be 5km/h, the front supporting legs 12 and the rear supporting legs 15 are seen by a specially-assigned person to be at a safe distance from the supporting legs to the ground, the specially-assigned person commands, and the front supporting traveling wheels 34 and the rear supporting traveling wheels 32 can play a role in temporary supporting and protecting when the bridge girder erection machine deflects.
After the bridge girder erection machine is driven to a destination, the front supporting legs 12 are separated from the auxiliary girder transport vehicle 24, the middle support 13 is separated from the main girder transport vehicle 22 through a reverse flow, the front protective walking wheels 34 and the rear protective walking wheels 32 are correspondingly removed in the separation process, the bridge girder erection machine is separated from the whole bridge girder transport vehicle, and the complete bridge girder erection machine is transferred.
According to the bridge girder erection machine transition system and the bridge girder erection machine transition method, the middle support 13 of the bridge girder erection machine is borne on the main girder transport vehicle 22 through the rear support 14 of the bridge girder erection machine, the front support leg 12 of the bridge girder erection machine is borne on the main girder transport vehicle 22, the whole bridge girder erection machine is slowly transported to a destination through the power of the main girder transport vehicle 22 and the auxiliary girder transport vehicle 24, the bridge girder erection machine does not need to be disassembled and then assembled, the mounting and dismounting risks of the bridge girder erection machine can be reduced, and the transition efficiency is improved. Meanwhile, four points in front and at the back of the bridge girder erection machine are provided with protective walking wheels, so that the safety of transition transportation of the bridge girder erection machine can be ensured.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (9)
1. A bridge girder erection machine transition system, comprising:
the bridge girder erection machine comprises a main girder, a front supporting leg, a middle support, a rear supporting leg and a crown block, wherein the front supporting leg, the rear support, the middle support and the rear supporting leg are sequentially arranged on the main girder, the distance between the middle support and the front supporting leg is twice of the distance between the middle support and the rear supporting leg, the rear support is positioned near the front supporting leg, and the crown block is arranged at the top of the main girder; and
the transportation device comprises a main beam transporting vehicle and an auxiliary beam transporting vehicle, the middle support is borne on the main beam transporting vehicle, and the front support legs are borne on the auxiliary beam transporting vehicle;
still include walking protection device, walking protection device includes back protection walking wheel and preceding protection walking wheel, back protection walking wheel install in on the back landing leg, preceding protection walking wheel install in on the preceding landing leg.
2. The bridge girder transition system according to claim 1, wherein the front supporting and traveling wheels are spaced from the ground by a distance of not more than 200mm, and the rear supporting and traveling wheels are spaced from the ground by a distance of not more than 200 mm.
3. The bridge girder erection machine transition system according to claim 1, wherein the middle support is fixed to the main girder by a clip, and a hoist of the overhead traveling crane hangs a cross beam of the middle support and tightens for fixation.
4. A bridge girder erection machine transition system according to claim 1, wherein the number of said crown blocks is two, respectively, a front crown block and a rear crown block, said rear crown block being located above said main girder and said front crown block being located above said sub girder.
5. The bridge girder erection machine transition method is characterized in that the bridge girder erection machine comprises a main guide beam, a front supporting leg, a middle support, a rear supporting leg and a crown block, wherein the front supporting leg, the middle support, the rear support and the rear supporting leg are sequentially arranged on the main guide beam, the crown block is arranged at the top of the main guide beam, and the transition method comprises the following steps:
moving the rear support between the middle support and the front supporting leg, and then fixing the middle support;
the main girder is jacked up by the rear support and the front supporting legs, and after a main girder transporting vehicle is in place, the rear support and the front supporting legs are contracted to bear the middle support on the main girder transporting vehicle;
moving the rear support to the front supporting legs, then jacking the main girder by the rear support, contracting the front supporting legs, and bearing the front supporting legs on the auxiliary girder transporting vehicle by the rear support after the auxiliary girder transporting vehicle is in place;
and transporting the whole bridge girder erection machine to a destination through the main girder transporting vehicle and the auxiliary girder transporting vehicle.
6. The bridge girder erection machine transition method according to claim 5, wherein the step of moving the rear bracket between the middle bracket and the front leg and then fixing the middle bracket further comprises:
and moving the middle support to the rear support, wherein after the middle support is moved, the distance between the middle support and the front support leg is twice as long as the distance between the middle support and the rear support leg.
7. The bridge girder erection machine transition method according to claim 5, wherein the step of fixing the middle bracket is specifically as follows:
and fixing the middle support on the main guide beam by adopting a hoop, and hoisting the cross beam of the middle support by using a hoist of the crown block to tighten and fix.
8. The bridge girder erection machine transition method according to claim 5, wherein after the main guide beam is jacked up by the rear bracket and the front leg, the rear leg is lifted off, and a rear protective road wheel is mounted on the rear leg; and/or
The rear support jacks the main guide beam, and the front support legs are provided with front support protective travelling wheels after being contracted.
9. The bridge girder erection machine transition method according to claim 5, wherein the step of rear retraction dropping the front legs onto the secondary girder transport vehicles further comprises:
and fixing the main girder with the main girder transporting vehicle and the auxiliary girder transporting vehicle through a hoist and a steel wire rope, wherein the two steel wire ropes connected with the main girder are crossed with each other.
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