CN110130229B - A multi-span parallel double cantilever bridge erecting machine and its beam erection and span crossing method - Google Patents
A multi-span parallel double cantilever bridge erecting machine and its beam erection and span crossing methodInfo
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- CN110130229B CN110130229B CN201910547503.3A CN201910547503A CN110130229B CN 110130229 B CN110130229 B CN 110130229B CN 201910547503 A CN201910547503 A CN 201910547503A CN 110130229 B CN110130229 B CN 110130229B
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- supporting leg
- girder
- crown block
- main truss
- leg
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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
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- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Carriers, Traveling Bodies, And Overhead Traveling Cranes (AREA)
Abstract
The application discloses a multi-amplitude juxtaposed double-cantilever bridge girder erection machine, a girder erection method and a via hole method thereof.A main girder is arranged on the main girder along the construction direction, a front crane crown block and a rear crane crown block are arranged to move back and forth on a track above a main girder along the construction direction, and crown block traversing mechanisms are arranged on the upper parts of the front crane crown block and the rear crane crown block to realize the transverse movement of the girder erection to finish multi-amplitude simultaneous erection; four sets of supporting legs are arranged below the main truss and comprise a front auxiliary supporting leg, a front supporting leg, a middle supporting leg and a rear supporting leg from front to back in sequence, wherein the front auxiliary supporting leg is arranged at the forefront end, the four sets of supporting legs can move back and forth along the construction direction, and a transverse moving mechanism is arranged on the upper parts of the front supporting leg and the middle supporting leg so as to realize that the transverse movement of the upper part of the main truss is completed to complete a plurality of simultaneous erection. The double-cantilever bridge girder erection machine adopts cantilever girders at two ends, can simultaneously erect a plurality of juxtaposed bridges while meeting the requirements of large-span girders and through holes, reduces the cross-over Kong Wanju and lightens the weight of the whole machine.
Description
Technical Field
The application relates to the technical field of bridge construction equipment bridge girder erection machines, in particular to a multi-amplitude parallel double-cantilever bridge girder erection machine and a girder erection and via hole method thereof.
Background
The bridge girder erection machine is equipment for placing prefabricated girder segments on prefabricated piers. Bridge girder erection machines belong to the category of cranes because the main function is to lift up the girder segments, then transport them to the location and then drop them down. Bridge girder erection machines are, however, quite different from cranes in general. The bridge girder erection machine has strict requirements and can walk on girder sheets or longitudinally move. The bridge girder erection machine is divided into a plurality of types of bridge girder erection machines, such as highway bridge erection, conventional railway bridge erection, passenger-dedicated railway bridge erection and the like.
The bridge girder erection machine generally comprises a horn, a crane trolley, a first column, a second column and a third column.
The mechanical arm is a bearing main beam of the bridge girder erection machine and is of a double-box girder structure, and each box girder is designed into a box-shaped variable section form according to the stress working condition of the mechanical arm and finite element analysis and calculation.
The bridge girder erection machine is provided with two lifting trolleys, and is provided with a lifting mechanism, a running mechanism and a traversing mechanism which are independent. Each lifting trolley is provided with two independent lifting mechanisms, and the two lifting mechanisms of the rear trolley enable the left lifting point and the right lifting point to be stressed uniformly through a balancing mechanism, so that four lifting points are converted into three lifting points during the operation of the lifting beam of the bridge girder erection machine, and the box girder is enabled to be stressed uniformly and stably lifted.
The first column is a front supporting leg of the bridge girder erection machine and is supported on a supporting cushion stone at the front half part of the front pier. Mainly comprises a supporting and changing wheel mechanism, a folding column, a telescopic column and the like. The girder erection device is longitudinally fixed with the horn into a hinged structure during girder erection operation, and the girder erection device becomes a flexible supporting leg, forms a portal frame structure with the horn and the second column, and meets the girder erection operation supporting requirement. The first column and the horn can move relatively during the longitudinal movement operation, so that the bridge girder erection machine can move longitudinally. The first column is provided with a folding mechanism, so that the requirements of bridge abutment support on the first column during normal girder erection and last hole box girder erection can be met. The first column and the horn have three fixed positions which can meet the erection of three box girders with different spans.
The second column is positioned in the middle of the horn and fixedly connected with the horn and is a rigid supporting leg. The lower beam of the second column is provided with two supporting legs, and the support pad for supporting the sleeper is realized and dismantled through the hydraulic oil cylinder, so that the stable support requirements of step change and girder erection operation during longitudinal movement are met. And a transverse moving mechanism is arranged under the two supporting legs, and the transverse moving oil cylinder is used for pushing the second column to drive the arm to swing, so that the position of the bridge girder erection machine is transversely adjusted, and the requirement of a curve girder erection is met. The lower cross beam is designed to be detachable due to the working condition requirement of the beam transporting vehicle for carrying the bridge girder erection machine.
The third column is a longitudinal movement driving column of the bridge girder erection machine, and is designed into a portal structure in order to meet the requirements of girder feeding and longitudinal movement driving of the bridge girder erection machine. Consists of a lifting column, a folding mechanism, a running mechanism, a hydraulic suspension balancing device, a steering mechanism and the like.
It is very common that the bridge girder erection machine is provided with highway bridges and railway bridges, and at present, when a simply supported girder is erected, a hanging girder trolley transversely moves to the middle position of two truss girders, a front hanging girder trolley and a rear hanging girder trolley are matched with the hanging girders, longitudinally move between two bridge decks, and then transversely move the bridge girder erection machine and the hanging girder trolley to an accurate position for girder falling.
With the high-speed development of economy, vehicles are greatly changed, and road and railway traffic systems are developed with long-term sustainable development. In road traffic construction, the progress of bridge construction of large bridges and extra large bridges has a great influence on completion of the whole traffic line.
The existing bridge girder erection machine can be used for construction, but when a girder is erected in a large span, the whole girder erection machine has large weight, a plurality of parallel connection conditions are more, the bending moment of a through hole is large, and accidents are easy to occur.
Disclosure of Invention
The application provides a multi-amplitude parallel double-cantilever bridge girder erection machine, a girder erection method and a via hole method thereof, wherein the cantilever girders at two ends are adopted, so that a large-span girder erection can be realized, simultaneously a plurality of parallel bridges can be erected, simultaneously Kong Wanju is reduced, and the weight of the whole machine is reduced.
One aspect of the application provides a multi-amplitude juxtaposed double-cantilever bridge girder erection machine, which comprises a main truss, a front crane crown block, a rear crane crown block, a front auxiliary supporting leg, a front supporting leg, a middle supporting leg and a rear supporting leg, wherein,
The front crane crown block and the rear crane crown block are arranged on the main truss along the construction direction, and can move back and forth along the main truss along the construction direction, and crown block traversing mechanisms are arranged on the upper parts of the front crane crown block and the rear crane crown block so as to realize that the transverse movement of the hanging beam is completed to finish a plurality of simultaneous erection;
The front auxiliary support leg, the front support leg, the middle support leg and the rear support leg are sequentially arranged below the main truss, wherein the front auxiliary support leg is arranged at the forefront end, the front auxiliary support leg, the front support leg, the middle support leg and the rear support leg can move back and forth along the construction direction, and the transverse moving mechanisms are arranged on the upper parts of the front support leg and the middle support leg so as to achieve the completion of transverse movement of the upper part of the main truss and multiple simultaneous erection.
Optionally, the bottom of the front landing leg is provided with a telescopic sleeve, the upper riding wheel device of the front landing leg supports the main truss, the upper part of the front landing leg is provided with the riding wheel device, and the lower part of the front landing leg is anchored with the pier.
Optionally, the upper portion of well landing leg is the riding wheel device, and the lower part has eight jacking cylinder supports.
Optionally, the upper part of the rear supporting leg is rigidly connected with the main truss, and the lower part of the rear supporting leg is provided with a jacking cylinder.
The application provides a girder erecting method of a double-cantilever girder erecting machine, which comprises a main truss, a front crane crown block, a rear crane crown block, a front auxiliary supporting leg, a front supporting leg, a middle supporting leg and a rear supporting leg, wherein the main truss is arranged on the main truss along the construction direction, the front crane crown block and the rear crane crown block can move back and forth along the construction direction along the main truss, and crown block traversing mechanisms are arranged on the upper parts of the front crane crown block and the rear crane crown block to realize that the girder is transversely moved to complete simultaneous erection for a plurality of frames;
The girder erecting method of the double-cantilever girder erecting machine comprises the following steps:
the double-cantilever bridge girder erection machine is in a girder erection station state, a front girder transporting vehicle carries a girder in place, a lifting appliance of the front crane is connected with a lifting point at the front end of the girder, and the front crane lifts the girder until the front end of the girder is separated from the front girder transporting vehicle;
The front crane and the rear girder transporting vehicle move forwards in a linkage way, the rear end lifting point of the girder reaches the rear crane, the rear crane lifting device is connected with the rear end lifting point of the girder, and the rear crane lifts the girder until the rear end of the girder is separated from the rear girder transporting vehicle;
The front crane crown block and the rear crane crown block travelling system are in linkage, longitudinally moved and adjusted in place, the front crane crown block and the rear crane crown block traversing system are in linkage, transversely moved and adjusted in place, and the front crane crown block and the rear crane crown block lifting system are in linkage, so that the steel beam is installed at a specified position;
the double-cantilever bridge girder erection machine is hung and fixedly connected with a newly-installed steel girder, a certain pretightening force is applied, and the prefabricated bridge deck is installed on the steel girder by utilizing the front crane crown block and the rear crane crown block;
and (3) removing the connection between the steel beam and the hanger, and preparing a via hole by a bridge girder erection machine.
Optionally, the bottom of the front landing leg is provided with a telescopic sleeve, the upper riding wheel device of the front landing leg supports the main truss, the upper part of the front landing leg is provided with the riding wheel device, and the lower part of the front landing leg is anchored with the pier.
Optionally, the upper portion of well landing leg is the riding wheel device, and the lower part has eight jacking cylinder supports.
Optionally, the upper part of the rear supporting leg is rigidly connected with the main truss, and the lower part of the rear supporting leg is provided with a jacking cylinder.
The application further provides a via hole method of a double-cantilever bridge girder erection machine, which comprises a main truss, a front crane crown block, a rear crane crown block, a front auxiliary supporting leg, a front supporting leg, a middle supporting leg and a rear supporting leg, wherein the main truss is arranged on the main truss along the construction direction, the front crane crown block and the rear crane crown block can move back and forth along the construction direction along the main truss, and crown block traversing mechanisms are arranged on the upper parts of the front crane crown block and the rear crane crown block to realize that the crane girders transversely move to finish a plurality of simultaneous erection, and the front auxiliary supporting leg, the front supporting leg, the middle supporting leg and the rear supporting leg are sequentially arranged on the lower part of the main truss, wherein the front auxiliary supporting leg is arranged at the forefront end, and the front auxiliary supporting leg, the front supporting leg, the middle supporting leg and the rear supporting leg can move back and forth along the construction direction;
The via hole method of the double-cantilever bridge girder erection machine comprises the following steps:
The front crane crown block and the rear crane crown block travel to the middle position of the double-cantilever bridge girder erection machine, and the oil cylinder of the rear supporting leg is retracted to be separated from the steel girder;
Releasing a safety anchoring device between the middle supporting leg and the main truss, starting the middle supporting leg and the front supporting leg longitudinal moving oil cylinder to push the main truss to move towards the construction direction, and moving the main truss forward until the front auxiliary supporting leg is positioned above the pier to support the front supporting leg to the pier;
the middle support leg is retracted to be separated from the beam surface, a traveling speed reducer is started to drive a riding wheel device of the middle support leg, so that the middle support leg moves to a designated position at the rear part of the front support leg in the construction direction;
releasing the anchoring of the front support leg and the main truss, and retracting the front support leg to a beam surface; starting a walking speed reducer to drive a riding wheel device of the front landing leg, so that the front landing leg moves to a designated position at the rear part of the front auxiliary landing leg in the construction direction, and extends out of the front landing leg to be supported on a pier;
the front crane crown block moves to the front end of the main truss in the construction direction, the rear crane crown block moves to the position right above the middle supporting leg, and the rear supporting leg is retracted to be separated from the girder surface.
The method comprises the steps of removing an anchoring device between a middle supporting leg and a main truss, starting a longitudinal moving oil cylinder of the middle supporting leg and a longitudinal moving oil cylinder of a front supporting leg to enable the main truss to move to a designated position in a construction direction, anchoring the middle supporting leg, the front supporting leg and the main truss, and enabling a through hole to be in place to prepare for erecting a steel beam.
Optionally, a telescopic sleeve is arranged at the bottom of the front supporting leg, the upper supporting wheel device of the front supporting leg supports the main truss, the upper part of the front supporting leg is provided with the supporting wheel device, the lower part of the front supporting leg is anchored with the pier, the upper part of the middle supporting leg is provided with the supporting wheel device, the lower part of the middle supporting leg is provided with eight jacking oil cylinders for supporting, the upper part of the rear supporting leg is rigidly connected with the main truss, and the lower part of the rear supporting leg is provided with the jacking oil cylinders.
The multi-side-by-side double-cantilever bridge girder erection machine, the girder erection method and the hole passing method adopt cantilever girders at two ends, so that the large-span girder erection is realized, simultaneously a plurality of side-by-side bridges can be erected, the number of the bridge girders is reduced by Kong Wanju, and the weight of the whole machine is reduced.
Drawings
FIG. 1 is a schematic structural view of a multiple juxtaposed double cantilever bridge girder erection machine according to an embodiment of the present application.
Fig. 2-7 are state diagrams of girder erection processes of the multiple juxtaposed double cantilever bridge girder erection machine according to another embodiment of the present application.
Fig. 8-13 are process state diagrams of the vias of the multiple juxtaposed double cantilever bridge girder erection machine according to another embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The term "and/or" is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean that a exists alone, while a and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship. In addition, the terms "system" and "network" are often used interchangeably herein.
Referring to fig. 1, a schematic structural diagram of a double-cantilever bridge girder erection machine according to an embodiment of the present application is shown, where the double-cantilever bridge girder erection machine includes a main truss 1, a front crane crown block 2, a rear crane crown block 3, a front auxiliary leg 4, a front leg 5, a middle leg 6, a rear leg 7, an electric hoist 8, a hanger 9, and a hanger beam 10, the hanger beam 10 is used for hoisting a steel girder 11, and in order to cooperate with the double-cantilever bridge girder erection machine, the double-cantilever bridge girder erection machine further includes a necessary hydraulic system (not shown) and an electric system (not shown).
The main truss 1 walks along the construction direction on the main truss 1, a front crane crown block 2 and a rear crane crown block 3 are arranged, the front crane crown block 2 and the rear crane crown block 3 can move back and forth along the main truss 1, and a crown block traversing mechanism is arranged on the upper parts of the front crane crown block 2 and the rear crane crown block 3 so as to realize that the transverse movement of the hanging beam completes a plurality of simultaneous erection. In another embodiment of the application, the front crane trolley 2 comprises a main trolley and an auxiliary trolley for laying a deck.
Below the main truss 1, the front auxiliary leg 4, the front leg 5, the middle leg 6 and the rear leg 7 are sequentially arranged, wherein the front auxiliary leg 4 is arranged at the forefront end, the front leg 5 and the middle leg 6 can be supported on a bridge pier, the rear leg 7 can be supported on a finished bridge, and the front auxiliary leg 4, the front leg 5, the middle leg 6 and the rear leg 7 are provided with reverse wheels capable of moving back and forth along the construction direction. The upper parts of the front supporting leg 5 and the middle supporting leg 6 are provided with a transverse moving mechanism so as to realize the transverse movement of the upper part of the main truss to finish a plurality of simultaneous erection.
The front auxiliary supporting leg 4 is of a C-shaped design, a telescopic sleeve is arranged at the bottom of the front supporting leg 5, the main truss 1 is supported by a riding wheel device at the upper part of the front supporting leg 5, the riding wheel device is arranged at the upper part of the front supporting leg 5, and the lower part of the front supporting leg is anchored with a pier. The upper part of the middle supporting leg 6 is provided with a riding wheel device, and the lower part is provided with eight jacking oil cylinders for supporting. The upper part of the rear supporting leg 7 is rigidly connected with the main truss 1, and the lower part is provided with a jacking cylinder. When the riding wheel devices of the front supporting leg 5 and the middle supporting leg 6 are used for passing holes of the bridge girder erection machine, the main truss is pushed to move forwards through the expansion and contraction of the oil cylinders.
The electric hoist 8 may be placed at the rearmost side of the main girder 1, i.e., the side that has been finished.
In another embodiment of the present application, as shown in fig. 2-7, which are state diagrams of the girder erection process of the double-cantilever bridge girder erection machine according to another embodiment of the present application, the girder erection method of the double-cantilever bridge girder erection machine may be as follows in connection with fig. 1.
Step 201, the bridge girder erection machine is in a girder erection station state, a front girder transporting vehicle carries a girder in place, a lifting appliance of a front crane crown block 2 is connected with a lifting point at the front end of the girder, and the front crane crown block 2 lifts the girder until the front end of the girder is separated from the front girder transporting vehicle.
Step 202, the front crane crown block 2 moves forwards in linkage with the rear girder transporting vehicle, the rear end lifting point of the girder is stopped after the rear crane crown block 3 is lowered, the lifting appliance of the rear crane crown block 3 is connected with the rear end lifting point of the girder, and the rear crane crown block 3 lifts the girder until the rear end of the girder is separated from the rear girder transporting vehicle.
And 203, longitudinally moving and adjusting the traveling systems of the front crane crown block 2 and the rear crane crown block 3 in place in a linkage way, transversely moving and adjusting the transverse moving systems of the front crane crown block 2 and the rear crane crown block 3 in place in a linkage way, and installing the steel beam at a specified position in a linkage way of the front crane crown block 2 and the rear crane crown block 3.
And 204, fixedly connecting the bridge girder erection machine hanger with the newly-installed steel girder and applying a certain pretightening force, and installing the prefabricated bridge deck onto the steel girder by utilizing the front crane crown block 2 and the rear crane crown block 3.
And 205, removing the connection between the steel beam and the hanger, and preparing a via hole by the bridge girder erection machine.
8-13, A process state diagram of the via hole of the dual-cantilever bridge girder erection machine according to another embodiment of the present application, in combination with FIG. 1, the via hole process of the dual-cantilever bridge girder erection machine may be as follows.
Step 301, the front crane crown block 2 and the rear crane crown block 3 move to the middle position of the double-cantilever bridge girder erection machine, and the oil cylinders of the rear supporting legs 7 are retracted until the oil cylinders are separated from the steel girder.
Step 302, the safety anchoring device between the middle supporting leg 6 and the main truss 1 is released, the middle supporting leg 6 and the front supporting leg 5 are started to longitudinally move the oil cylinder to push the main truss 1 to move towards the construction direction, the main truss 1 moves forward until the front auxiliary supporting leg 4 is positioned above the pier, and the front supporting leg 5 is supported on the pier.
Step 303, anchoring the main truss 1 with the front support leg 5, extending the rear support leg 7 to support the main truss on the beam surface, retracting the middle support leg 6 to be separated from the beam surface, starting a traveling speed reducer to drive a riding wheel device of the middle support leg 6, enabling the middle support leg 6 to move to a designated position at the rear part of the front support leg 5 in the construction direction, supporting the extending middle support leg 6 on the beam surface, and anchoring the middle support leg 6 with the main truss 1.
And 304, releasing the anchoring of the front supporting leg 5 and the main truss 1, retracting the front supporting leg 5 to a position separated from the girder surface, and starting a traveling speed reducer to drive a front supporting leg 5 riding wheel device so that the front supporting leg 5 moves to a designated position at the rear part of the front auxiliary supporting leg 4 in the construction direction, and extending out of an oil cylinder of the front supporting leg 5 to be supported on a pier.
And 305, moving the front crane crown block 2 to the front end of the main truss 1 in the construction direction, moving the rear crane crown block 3 to the position right above the middle supporting leg 6, and retracting the rear supporting leg 7 to the position away from the beam surface.
Step 306, releasing the anchoring devices between the middle supporting leg 6 and the main truss 1, starting the longitudinal moving oil cylinders of the middle supporting leg 6 and the front supporting leg 5 to enable the main truss 1 to move to a designated position in the construction direction, anchoring the middle supporting leg 6, the front supporting leg 5 and the main truss 1, and enabling through holes to be in place to prepare for erecting a steel beam.
In summary, the double-cantilever bridge girder erection machine adopts cantilever girders at two ends, so that the double-cantilever bridge girder erection machine can meet the requirement of large-span girders and simultaneously reduce the total weight of the whole machine by Kong Wanju.
While the application has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that the foregoing embodiments may be modified or equivalents may be substituted for some of the features thereof, and that the modifications or substitutions do not depart from the spirit and scope of the embodiments of the application.
Claims (10)
1. The double-cantilever bridge girder erection machine is characterized by comprising a main truss (1), a front crane crown block (2), a rear crane crown block (3), a front auxiliary supporting leg (4), a front supporting leg (5), a middle supporting leg (6) and a rear supporting leg (7),
The main truss (1) is arranged on the main truss (1) along the construction direction, the front crane crown block (2) and the rear crane crown block (3) are arranged on the main truss (1), the front crane crown block (2) and the rear crane crown block (3) can move back and forth along the main truss (1) along the construction direction, and crown block traversing mechanisms are arranged on the upper parts of the front crane crown block (2) and the rear crane crown block (3) so as to realize that the transverse movement of the hanging beam is completed to realize a plurality of simultaneous erection;
The front auxiliary support leg (4), the front support leg (5), the middle support leg (6) and the rear support leg (7) are sequentially arranged below the main truss (1) from front to back, wherein the front auxiliary support leg (4) is arranged at the forefront end, the front auxiliary support leg (4), the front support leg (5), the middle support leg (6) and the rear support leg (7) move back and forth along the construction direction, and anchoring devices are respectively arranged between the front support leg (5) and the main truss (1) and between the middle support leg (6) and the main truss (1) and used for anchoring the front support leg (5) and the main truss (1) or anchoring the middle support leg (6) and the main truss (1);
The utility model discloses a double cantilever bridge girder erection machine, including main truss, well landing leg (6), front leg (5) with well landing leg (6) upper portion sets up sideslip mechanism in order to realize that part lateral shifting more than the main truss accomplishes a plurality of erections simultaneously, the upper portion of front leg (5) still is equipped with riding wheel device, and the mechanism of indulging is established on its upper portion, the upper portion of well landing leg (6) also is equipped with riding wheel device, riding wheel device is used for supporting main truss (1) and when two cantilever bridge girder erection machine via hole are through indulging the hydro-cylinder promotion main truss moves to the construction direction, riding wheel device can also drive under the drive of walking speed reducer corresponding front leg (5) or well landing leg (6) moves to the construction direction.
2. The multi-side-by-side double-cantilever bridge girder erection machine according to claim 1, wherein the front supporting leg (5) is supported to the top surface of a pier, the middle part of the front supporting leg (5) is a cross beam, the lower part of the front supporting leg is anchored with the pier, a telescopic sleeve is arranged at the bottom of the front supporting leg (5) and anchored with the pier, a traversing mechanism is arranged on the cross beam of the front supporting leg (5) to realize the transverse movement of the part above a main truss, and reverse change gears are arranged on the upper part of a riding wheel of the front supporting leg (5) at two sides of a lower cover plate of a main girder so that the front supporting leg (5) can move back and forth along the construction direction.
3. The multi-side-by-side double-cantilever bridge girder erection machine according to claim 1, wherein the middle supporting leg (6) is supported at a girder end, the middle part of the middle supporting leg (6) is a cross beam, eight jacking cylinders are arranged at the lower part of the middle supporting leg, the cross beam of the middle supporting leg (6) is provided with an anchoring device for anchoring with a girder surface, and the jacking cylinders at the lower part of the middle supporting leg (6) are supported at the girder end.
4. A multiple juxtaposed double cantilever bridge girder erection machine according to any of the claims 1-3, characterized in that the upper part of the rear leg (7) is rigidly connected to the main girder (1) and the lower part has a jacking cylinder supported to the girder face.
5. A girder erecting method of a multi-side-by-side double-cantilever girder erecting machine is characterized in that the double-cantilever girder erecting machine comprises a main girder (1), a front crane crown block (2), a rear crane crown block (3), a front auxiliary supporting leg (4), a front supporting leg (5), a middle supporting leg (6) and a rear supporting leg (7), wherein the main girder (1) is arranged on the main girder (1) along the construction direction, the front crane crown block (2) and the rear crane crown block (3) are arranged on the main girder (1), the front crane crown block (2) and the rear crane crown block (3) can move back and forth along the construction direction along the main girder (1), a crown block traversing mechanism is arranged on the upper parts of the front crane crown block (2) and the rear crane crown block (3) to realize that the transverse movement of a girder is completed for a plurality of simultaneous erection, the front auxiliary supporting leg (4), the front supporting leg (5), the middle supporting leg (6) and the rear supporting leg (7) are sequentially arranged under the main girder (1), the auxiliary supporting leg (4), the front supporting leg (5) and the rear supporting leg (6) are arranged in sequence, the front supporting leg (6) and the main girder (1) can be respectively arranged between the front supporting leg (6) and the main girder (1) along the construction direction, the device comprises a main truss (1), a middle supporting leg (6), a front supporting leg (5), a supporting wheel device and a double-cantilever bridge girder erection machine, wherein the front supporting leg (5) is anchored with the main truss (1) or the middle supporting leg (6) is anchored with the main truss (1), a transverse moving mechanism is arranged at the upper parts of the front supporting leg (5) and the middle supporting leg (6) to realize that the parts above the main truss are transversely moved to finish a plurality of simultaneous erection, the supporting wheel device is also arranged at the upper part of the front supporting leg (5), the supporting wheel device is also arranged at the upper part of the middle supporting leg (6), and is used for supporting the main truss (1) and pushing the main truss to move towards a construction direction through a longitudinal moving oil cylinder when the double-cantilever bridge girder erection machine passes through holes, and the supporting wheel device can also drive the corresponding front supporting leg (5) or the middle supporting leg (6) to move towards the construction direction under the driving of a walking speed reducer;
The girder erecting method of the double-cantilever bridge girder erecting machine which is juxtaposed in a plurality of ways comprises the following steps:
the double-cantilever bridge girder erection machine is in a girder erection station state, a front girder transporting vehicle carries a girder in place, a lifting appliance of the front crane crown block (2) is connected with a lifting point at the front end of the girder, and the front crane crown block (2) lifts the girder until the front end of the girder is separated from the front girder transporting vehicle;
the front crane and the rear girder transporting vehicle move forwards in a linkage way, the lifting point at the rear end of the girder reaches the rear crane, the lifting point at the rear end of the girder is stopped after the rear crane is lowered, the lifting tool of the rear crane (3) is connected with the lifting point at the rear end of the girder, and the rear crane (3) lifts the girder until the rear end of the girder is separated from the rear girder transporting vehicle;
The front crane crown block and the rear crane crown block travelling system are in linkage, longitudinally moved and adjusted in place, the front crane crown block and the rear crane crown block traversing system are in linkage, transversely moved and adjusted in place, and the front crane crown block and the rear crane crown block lifting system are in linkage, so that the steel beam is installed at a specified position;
The steps sequentially finish the erection of other juxtaposed beams through the transverse movement of the front crane crown block and the rear crane crown block and the transverse movement of the main truss;
the double-cantilever bridge girder erection machine is hung and fixedly connected with a newly-installed steel girder, a certain pretightening force is applied to realize girder arch lifting, and the front crane crown block and the rear crane crown block (3) are utilized to install a prefabricated bridge deck onto the steel girder;
and (3) removing the connection between the steel beam and the hanger, and preparing a via hole by a bridge girder erection machine.
6. The girder erecting method according to claim 5, wherein the middle part of the front supporting leg (5) is a cross beam, the lower part is anchored with the pier, and the bottom of the front supporting leg (5) is provided with a telescopic sleeve pier for anchoring.
7. A girder erection method according to claim 5, characterized in that the lower part of the middle leg (6) has eight jacking cylinders in total.
8. A girder erection method according to any one of claims 5-7, characterized in that the rear leg (7) is rigidly connected to the main girder (1) at its upper part and a jacking cylinder at its lower part.
9. A via hole method of a double-cantilever bridge girder erection machine is characterized by comprising a main truss (1), a front crane crown block (2), a rear crane crown block (3), a front auxiliary supporting leg (4), a front supporting leg (5), a middle supporting leg (6) and a rear supporting leg (7), wherein the main truss (1) is arranged above the main truss (1) along the construction direction, the front crane crown block (2) and the rear crane crown block (3) are arranged, the front crane crown block (2) and the rear crane crown block (3) can move back and forth along the construction direction along the main truss (1), a crown block traversing mechanism is arranged at the upper part of the front crane crown block (2) and the rear crane crown block (3) to realize that the transverse movement of a girder is completed for a plurality of simultaneous erection, the front auxiliary supporting leg (4), the front supporting leg (5), the middle supporting leg (6) and the rear supporting leg (7) are sequentially arranged below the main truss (1), the front auxiliary supporting leg (4), the front supporting leg (5), the middle supporting leg (6) and the rear supporting leg (7) are arranged at the front auxiliary supporting leg (4), the front auxiliary supporting leg (6) and the front supporting leg (6) are respectively arranged between the main truss (1) and the front supporting leg (6) and the front supporting leg (5) and the front supporting leg (1), the device comprises a main truss (1), a middle supporting leg (6), a front supporting leg (5), a supporting wheel device and a double-cantilever bridge girder erection machine, wherein the front supporting leg (5) is anchored with the main truss (1) or the middle supporting leg (6) is anchored with the main truss (1), a transverse moving mechanism is arranged at the upper parts of the front supporting leg (5) and the middle supporting leg (6) to realize that the parts above the main truss are transversely moved to finish a plurality of simultaneous erection, the supporting wheel device is also arranged at the upper part of the front supporting leg (5), the supporting wheel device is also arranged at the upper part of the middle supporting leg (6), and is used for supporting the main truss (1) and pushing the main truss to move towards a construction direction through a longitudinal moving oil cylinder when the double-cantilever bridge girder erection machine passes through holes, and the supporting wheel device can also drive the corresponding front supporting leg (5) or the middle supporting leg (6) to move towards the construction direction under the driving of a walking speed reducer;
The via hole method of the double-cantilever bridge girder erection machine comprises the following steps:
The front crane crown block and the rear crane crown block travel to the middle position of the double-cantilever bridge girder erection machine, and the oil cylinder of the rear supporting leg is retracted to be separated from the steel girder;
Releasing a safety anchoring device between the middle supporting leg (6) and the main truss (1), starting the middle supporting leg (6) and the front supporting leg (5) to longitudinally move an oil cylinder to push the main truss (1) to move towards the construction direction, and enabling the main truss (1) to move forwards until the front auxiliary supporting leg (4) is positioned above a pier to support the front supporting leg (5) to the pier;
The main truss (1) is anchored with the front supporting leg (5), the rear supporting leg (7) extends out and is supported on a beam surface, the middle supporting leg (6) is retracted to be separated from the beam surface, a walking speed reducer is started to drive a riding wheel device of the middle supporting leg (6) so that the middle supporting leg (6) moves to a designated position at the rear part of the front supporting leg (5) in the construction direction, the middle supporting leg (6) extends out and is supported on the beam surface, and the middle supporting leg (6) is anchored with the main truss (1);
The anchoring of the front supporting leg (5) and the main truss (1) is released, the front supporting leg (5) is retracted to be separated from the girder surface, a walking speed reducer is started to drive a riding wheel device of the front supporting leg (5), so that the front supporting leg (5) moves to a designated position at the rear part of the front auxiliary supporting leg (4) in the construction direction, and the front supporting leg (5) extends out to be supported on a pier;
The front crane crown block (2) moves to the front end of the main truss in the construction direction, and the rear crane crown block moves to the position right above the middle supporting leg (6);
The method comprises the steps of removing an anchoring device between a middle supporting leg (6) and a main truss (1), starting a longitudinal moving oil cylinder of the middle supporting leg (6) and a front supporting leg (5) to enable the main truss (1) to move to a designated position in a construction direction, anchoring the middle supporting leg (6) and the front supporting leg (5) and the main truss (1), and enabling through holes to be in place to prepare for erecting a steel beam.
10. The via hole method according to claim 9, wherein an oil cylinder is installed at the bottom of the front supporting leg (5), an upper cross beam of the front supporting leg (5) is rigidly connected with the main truss (1), the lower part of the front supporting leg (5) is anchored with a pier, eight jacking oil cylinders are supported at the lower part of the middle supporting leg (6), and the upper part of the rear supporting leg (7) is rigidly connected with the main truss (1), and jacking oil cylinders are arranged at the lower part of the rear supporting leg.
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