CN110804950A - Safe and energy-saving beam transportation method for bridge construction - Google Patents

Abstract

The invention discloses a method for safe and energy-saving beam transportation on a bridge, which is carried out according to the following steps: the first step is a lifting and transportation step; the second step is a bridge-on-bridge step; the third step is a temporary support step; and the fourth step is a transportation step. The fifth step is the step of releasing the temporary support; the sixth step is the step of transporting the beam; the seventh step is the step of returning the beam transporting trolley; construction location. The existing bridge, that is, the lower bridge, can be used to transport the box girder section from the beam yard to the bridge construction site on the bridge, so as to solve the problem of transferring the box girder section and the problem of overweight axle load, so as to use the existing bridge to transport the overweight. Box girder segment. The present invention can not only improve the construction efficiency, but also has the obvious effect of energy saving and environmental protection, and avoids the material waste and environmental pollution caused by the construction of the beam transport channel.

Description

Safe and energy-saving beam transportation method for bridge construction

technical field

The invention relates to the technical field of bridge construction.

Background technique

In modern society, bridges play an increasingly important role, not only in traditional situations such as crossing waters (rivers, etc.), ditches and other occasions that require bridges to pass, but also play an important role in three-dimensional transportation in cities.

With the development of cities and the improvement of people's living standards, the number of motor vehicles in our country is increasing rapidly year by year, which brings more and more pressure to traffic. In some occasions with large traffic flow, the existing single-layer bridges The traffic capacity cannot meet people's traffic needs. To ensure smooth traffic, new bridges need to be erected on top of existing bridges in order to increase the traffic capacity. The construction of the bridge on the bridge has the advantage that the new bridge does not occupy additional ground space, does not need to be demolished, increases the traffic capacity, and does not need to bear the high cost of demolition, so it has a wide range of promotion and application prospects.

The construction of new bridges over existing bridges is a new topic, and the box girder sections of the new bridges on the upper floors need to be transported to the construction site during construction. The general standard for bridge load-bearing is that the axle load cannot exceed 50 tons, and the box girder sections of large bridges are often overly long and overweight. For box girder segments, for a single box girder segment greater than 100 tons, it is difficult to ensure that the axle load does not exceed 100 tons. When the box girder segment is larger than 200 tons, there is no guarantee that the axle load does not exceed 100 tons.

The bridge usually has two-way opposite lanes, and the bridge has two bridges, that is, the left bridge and the right bridge, and the lanes in one direction are on the same bridge. Existing trucks can only travel on the same bridge.

For larger box girder segments (usually large bridges where double-layer or multi-layer bridges need to be constructed, the box girder segments are longer and heavier), it is impossible to use trucks in the existing technology to transport existing bridges on the lower level. For upper transportation, only the method of erecting brackets can be used to transport the box girder segments. It is necessary to erect brackets below and above the existing bridge, otherwise the existing bridge will be crushed, which will greatly reduce the efficiency of beam transportation. , and increased construction costs.

When designing the technical scheme for transporting the box girder of the upper bridge on the existing bridge, in addition to overcoming the problem of overweight axle load, it is also necessary to overcome the problem of how to transport the box girder of the upper bridge to the existing bridge.

As shown in Figures 1 and 2, for the convenience of construction, the most favorable construction position of the beam field 23 is adjacent to the existing bridge. Since the new bridge is located above the existing bridge, the existing bridge is called the lower bridge in the present invention. Parallel to the lower bridge 24 . An auxiliary road 25 connecting the beam field 23 and the lower bridge 24 needs to be constructed between the beam field 23 and the lower bridge 24 . When the box girder of the upper bridge is transported from the beam yard 23 to the lower bridge 24 , the box girder needs to be transported to the lower bridge 24 via the auxiliary road 25 .

In order to overcome the problem of overweight axle load, the present invention designs a brand-new double-width bridge plus track beam transport mode, that is, a track mechanism is simultaneously set on the double-width bridge deck of the lower bridge 24 . Similarly, an auxiliary rail mechanism corresponding to the rail mechanism on the lower bridge 24 also needs to be provided on the auxiliary road 25 .

Technical difficulties were also encountered when designing new solutions. 1 and 2, the auxiliary road 25 and the lower bridge 24 are vertically connected. After the box girder enters the lower bridge 24 through the auxiliary road 25, according to the existing beam transporting idea, it will encounter how to make the beam transport trolley And the technical problem of box girder to achieve 90-degree turn.

The box girder section is overweight and long, and a 90-degree turn is required. On the one hand, the space required is huge, and enough box girder sections need to be rotated; ), it is difficult to realize the 90-degree rotation of the box girder, and it takes a lot of energy to rotate the box girder segments.

The auxiliary rail mechanism is bound to intersect with the rail mechanism on the lower bridge 24 at 90 degrees. It is also very difficult in the prior art to make each beam transporting trolley running along the rail achieve a 90-degree rail transition without the aid of a spreader.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a method for safe and energy-saving beam transportation for bridge construction, which can utilize the existing bridge, that is, the lower bridge, to transport the box girder section from the girder yard to the construction site of the bridge construction on the bridge, so as to solve the problem of transporting the box girder section by rail transfer. segment and overweight axle loads, thereby utilizing existing bridges to transport overweight box girder segments.

In order to achieve the above-mentioned purpose, the method for building a bridge on a bridge for safe and energy-saving beam transportation of the present invention is carried out through a bridge building and transporting beam system on the bridge, the existing bridge is a lower-level bridge, the new bridge is an upper-level bridge, and the bridge-building and transporting beam system includes using The rail-conveying beam structure for transporting the box girder segments from the beam yard to the lower-level bridge, and the along-bridge transport structure for transporting the box-girder segment along the lower-level bridge to the construction site;

The lower bridge includes left and right bridge decks for vehicles traveling in opposite directions, and there is an isolation belt between the left and right bridge decks;

The rail-transfer beam structure includes the lower-level bridge, and the lower-level bridge is provided with a rail mechanism along the length of the lower-level bridge; one side of the lower-level bridge is provided with a beam yard, and the beam exit end of the beam yard is provided with an auxiliary road, which connects the beam yard and the lower level. bridge;

An auxiliary rail mechanism is arranged on the auxiliary road, and the auxiliary rail mechanism intersects with the rail mechanism; the rail mechanism of the lower bridge includes the first to fourth rail mechanisms arranged in parallel and side by side,

The auxiliary rail mechanism on the auxiliary road includes the fifth and sixth rail mechanisms arranged in parallel; the fifth and sixth rail mechanisms respectively intersect with the first to fourth rail mechanisms and form 8 intersections;

The first to sixth track mechanisms are all used for beam-carrying trolleys;

On the lower bridge, the length direction of the lower bridge is the front and rear direction, and the beam transport direction is the forward direction; on the auxiliary road, the length direction of the auxiliary road is the front and rear direction, and the beam transport direction is the forward direction;

The structure of each rail mechanism is the same, including the left rail mechanism and the right rail mechanism; the structure of the left rail mechanism and the right rail mechanism are the same, and both include a concrete foundation laid along the front and rear directions, and the top of the concrete foundation is fixed upward in the middle of the left and right directions. There is a support track; the support track is used to support the beam transport trolley;

At the intersection of each track mechanism, the concrete foundations of the two intersecting track mechanisms are horizontally connected, and a square support block is provided on the concrete foundation at the intersection of the support rails. The tops of the two supporting rails are the same width; the two intersecting supporting rails are provided with a fracture at the intersection, the four sides of the supporting block are respectively facing the supporting rail on the side of the fracture, and the four sides of the supporting block and the supporting rail opposite There are gaps between them and the gaps are the same, and the gap is less than or equal to a quarter of the diameter of the walking wheel of the beam transport trolley;

The beam transport trolley is respectively provided with a jacking device for supporting the transported box girder segment, and the top of the jacking device is higher than the isolation belt; Support plates for supporting the box girder segments being transported;

The conveying structure along the bridge includes the first to fourth track mechanisms and the beam conveying trolley;

The first track mechanism and the second track mechanism are arranged on the left deck and form the left deck track mechanism, and the third track mechanism and the fourth track mechanism are arranged on the right deck and constitute the right deck track mechanism; The left deck track mechanism and the right deck track mechanism are symmetrically arranged with respect to the isolation belt;

The beam transporting trolley includes a horizontally arranged frame, the four corners of the frame are respectively equipped with the walking wheels through the axles, the frame is provided with a motor, and the motor is connected with the axles of each walking wheel through a transmission mechanism; The top of the pushing device with the pushing device is higher than the isolation belt;

A rotating support mechanism is provided on the lower deck where the tracks intersect;

The rotating support mechanism includes a bottom plate, a bracket is arranged on the bottom plate, a forward and reverse frequency conversion motor is arranged on the bottom plate on one side of the bracket, and a rotating support device is hinged on the bottom plate on the other side of the bracket, and the rotating support device is a hydraulic cylinder or an electric push rod or Cylinder; the extension rod of the rotary support device is hinged with a bearing plate for temporary support;

The output shaft of the forward and reverse frequency conversion motor is connected with a traction rope, and the top of the bracket is provided with a fixed pulley. , the return spring is connected with the bottom plate;

A first travel switch is provided on the side adjacent to the support and the rotary support device, and a second travel switch corresponding to the rotary support device is provided on the bottom plate;

The rotary support device has a lying down position and a vertical position; when the rotary support device is in the lying down position, the second travel switch is pressed, and the return spring is in a relaxed or compressed state at this time; when the rotary support device is in the lying down position, the low Box girder segments transported by beam transport trolleys;

When the rotary support device is in a vertical position, press the first travel switch, the return spring is in a stretched state, and the bearing plate is facing upward; when the rotary support device is in a vertical position and its extension rod is in a retracted state, the bearing plate is low Box girder segments transported by beam transport trolleys;

The middle part of the frame of the beam transport trolley is downwardly connected with a support groove with an opening at the bottom, the groove wall of the support groove is connected with a rotating plate through the bearing rotation, and the rotating plate is slidingly matched with the lower side wall of the support groove; the middle part of the rotating plate is connected downward with a rotating plate The rail support device is a hydraulic cylinder or an electric push rod or an air cylinder; the rail support device has an extension rod, and the extension rod of the rail support device extends downward and is connected with a support plate, and the center of gravity of the beam transport trolley is located at the rail support directly above the device;

The motor on each beam transport trolley adopts frequency conversion deceleration motor; each beam transport trolley is provided with a first wireless communication module; a movable electronic control device is arranged outside the beam transport trolley, and the electronic control device is connected with a battery and a second wireless communication module. a communication module; the rail shifting support device, the rotating support device, the forward and reverse frequency conversion motor, the first travel switch and the second travel switch are all connected with the third wireless communication module;

The motor and the pushing device on each beam transporting trolley are connected with the first wireless communication module, and the third wireless communication module and the first wireless communication module on each beam transporting trolley are respectively connected with the electronic control device through the second wireless communication module. connect;

The safe and energy-saving beam transportation method on the bridge is carried out according to the following steps:

The beam yard is equipped with a gantry crane; in the initial state, the rotating support device is in the lying down position;

The first step is the lifting step;

Make 8 beam transporting trolleys drive to the position corresponding to the beam yard on the auxiliary rail mechanism corresponding to the beam yard, the relative position of the 8 beam transporting trolleys to each other and the relative position of the 8 intersections of the rail mechanism. same;

Use the gantry crane in the beam yard to hoist the box girder sections used for the construction of the upper bridge to 8 beam transport trolleys, and the length direction of the box girder section is perpendicular to the beam transport direction of the lower bridge;

The second step is the step of going up the bridge; the variable frequency deceleration motor on each beam transporting trolley is started by the electronic control device, and each beam transporting trolley carrying the box girder segment is driven to start synchronously and make each beam transporting trolley run to the 8 intersections of the track mechanism. At this time, the traveling wheels of each beam transport trolley are respectively supported on the support blocks at the corresponding intersection positions;

The third step is the temporary support step;

Synchronously start the forward and reverse frequency conversion motors of each rotating support mechanism, so that the forward and reverse frequency conversion motors pull the rotating support device through the traction rope to rotate to the vertical position. At this time, each rotating support device presses the first travel switch, and each rotating support mechanism The return springs are all in a stretched state; after the rotary support device presses the first travel switch, the electronic control device controls the corresponding forward and reverse frequency conversion motors to stop, and controls the extension rod of the corresponding rotary support device to extend upward, so that the bearing plate Press up and support the box girder segment;

The fourth step is the rail-changing step of the beam-carrying trolley;

The electric control device controls the jacking rod of the beam transporting trolley to retract downward. At this time, the box girder sections are supported by each rotating support mechanism, and the beam transporting trolley is in a free state; the operator turns each beam transporting trolley to make each transporting trolley move. The walking wheels of the beam trolley correspond to the corresponding support rails on the lower bridge;

The fifth step is to release the temporary support step;

The electric control device controls the jacking rod of the jacking device of the beam transport trolley to extend upward, so that the support plate is pressed upward and supports the box girder segment;

Then, the electronic control device controls the forward and reverse frequency conversion motors of each rotating support mechanism to reverse, and under the pulling force of each return spring, each rotating support device rotates to the lying down position. During this process, by controlling the speed of the forward and reverse frequency conversion motors Control the speed at which the rotating support device rotates to lie down;

After the rotary support device presses the second travel switch, the electric control device controls the corresponding forward and reverse frequency conversion motors to stop, completing the step of releasing the temporary support;

The sixth step is the step of transporting beams; the staff controls the synchronous operation of each beam transporting trolley through the electronic control device, and transports the box girder segments along the lower deck to the construction position;

The seventh step is the return step of the beam transport trolley;

After the box girder section is lifted by the construction machinery at the construction position, the staff controls the beam transport trolleys to return to the 8 intersections of the track mechanism through the electronic control device;

Then the operator turns each beam transporting trolley to make the walking wheels of each beam transporting trolley correspond to the corresponding support rails on the auxiliary road;

The electronic control device controls the frequency conversion deceleration motor on each beam transporting trolley, and drives each beam transporting trolley to run synchronously to the position corresponding to the beam field on the auxiliary rail mechanism;

Repeat the first to seventh steps to continuously transport the box girder segments to the construction site.

In the first step, before hoisting the box girder segments to each beam transporting trolley, the staff controls the jacking device on each beam transporting trolley through the electronic control device, and adjusts the up and down telescopic position of the jacking rod of each jacking device , so that the support plates of the jacking devices of each beam transporting trolley are in the same horizontal position;

After the box girder sections to be transported are hoisted to each beam transport trolley, the staff controls the jacking device through the electronic control device, and adjusts the up and down telescopic position of the jacking rod of each jacking device, so that the jacking of each beam transport trolley can be adjusted. The support plates of the device are pressed against the box girder segments;

In the second, sixth and seventh steps, the staff synchronously controls the working frequency of the variable frequency deceleration motor of each beam transporting trolley through the electronic control device, so as to synchronously adjust the running speed of each beam transporting trolley to the predetermined speed, so that the Each beam transport trolley runs at the same speed.

In the fourth step, that is, the rail-changing step of the beam-carrying trolley, before the operator rotates each beam-carrying trolley, the electronic control device controls the rail-transporting support device of each beam-transporting trolley, so that the extension rod of the rail-transporting support device extends downwards. Make the support plate support on the lower bridge deck; continue to extend the extension rod of the swivel support device downward, so that the swivel support device pushes the frame of the beam transporting trolley upwards until the traveling wheels of the beam transporting trolley leave the support upwards. piece;

Then the operator manually rotates each beam transporting trolley, so that the frame and support groove of each beam transporting trolley rotate around the rotating disc, until the traveling wheels of each beam transporting trolley correspond to the corresponding supporting rails on the first to fourth track mechanisms .

In the seventh step, that is, the return step of the beam transporting trolley, before the operator rotates each beam transporting trolley, the electronic control device controls the rail shifting support device of each beam transporting trolley, so that the extension rod of the shifting rail supporting device extends downward, so that the The support plate is supported on the lower bridge deck; continue to extend the extension rod of the rail transfer support device downward, so that the rail transfer support device pushes the frame of the beam transport trolley upwards until the traveling wheels of the beam transport trolley leave the support block upward. ;

Then the operator manually rotates each beam transporting trolley to make the frame and support groove of each beam transporting trolley rotate around the rotating disk until the traveling wheels of each beam transporting trolley correspond to the corresponding supporting rails of the fifth and sixth track mechanisms.

The present invention has the following advantages:

In the present invention, two intersecting support rails are provided with fractures at the intersection, and the fractures and the arrangement of structures such as inner support blocks, for example, there are gaps between the four sides of the support block and the supporting rails facing each other, and the gaps are the same, The gap is less than or equal to a quarter of the diameter of the traveling wheel of the beam transport trolley, which is not only convenient for the beam transport trolley to move forward or backward along the original track without obstacles, but also facilitates the beam transport trolley to perform (90 degree) rail transfer at the intersection of the support rails. .

The invention distributes the weight of the super-long and super-heavy box girder segments on the lower-level bridge or the auxiliary road along the length direction of the lower-level bridge and the auxiliary road through the track mechanism, which greatly reduces the axle load. The present invention further doubles the capacity of the existing lower-level bridge to transport the box girder segments through the simultaneous load-bearing of the left bridge deck and the right bridge deck. The invention ensures that the existing bridge can transport the super-long and over-weight box girder segments through the double-width bridge bearing and the track dispersing the axle load, preventing the phenomenon that the axle load is too large, the lower bridge or the auxiliary road is crushed, and ensuring the safety of transportation. Under the premise of using the existing bridge to transport the box girder segment of the upper-level bridge to be built.

Specifically, the present invention uses the first to fourth rail mechanisms to change the conventional weight transmission method in which the wheel and the bridge deck are in point contact with the weight transmission method in which the rail (specifically, the concrete foundation) is in line contact with the bridge deck. The axle load of the bridge refers to the load-bearing of the bridge on the cross-section of a bridge on the upper side of the transverse bridge. The present invention adopts the method of rail load-bearing. When transporting box girder sections of the same weight, the weight of the box girder section is passed through each track. The mechanism is dispersed throughout the bridge in the longitudinal direction (the direction of the length of the bridge), which greatly reduces the axle load of the bridge (the weight on the cross section of the bridge). The existing bridges can be transported from overweight box girder sections to being able to transport overweight box girder sections, so as to ensure that the existing bridges are not crushed and collapsed.

The left bridge deck track mechanism and the right bridge deck track mechanism are symmetrically arranged with respect to the isolation belt, so that the weight of the transported box girder segments can be more evenly distributed on the left bridge deck and the right bridge deck.

The setting of the jacking rod can flexibly adjust the total height of the jacking device of each beam transport trolley. On the one hand, it can adjust the height of the conveyed box girder section and the ground, and ensure that the conveying box girder section avoids the bridge deck facilities. On the other hand, it can ensure that the jacking devices of each beam transporting trolley are in good contact with the box girder segments, so that the jacking devices of each beam transporting trolley can play a good supporting role. Since the bottom surface of the box girder segment may not be absolutely horizontal, after the box girder segment is hoisted to each beam transport trolley, each support plate will be adapted to rotate according to the bottom surface of the box girder segment it contacts, Ensure that the support plate is in good contact with the box girder segment, and avoid damage to the support plate or the bottom surface of the box girder segment due to the included angle between the support plate and the bottom surface of the box girder segment.

Compared with the track directly laid on the bridge deck, the setting of the concrete foundation can further reduce the pressure on the bridge deck. The motor is connected with each traveling wheel through a transmission mechanism, and each traveling wheel is a driving wheel, so that the beam transport trolley has better transportation capacity. The electronic control device controls the state of each beam transporting trolley by means of wireless communication, which not only avoids the disadvantages of complicated cables caused by wired connection, but also can control the coordinated operation of all beam transporting trolleys.

By adopting the beam transporting method of the present invention, after each track mechanism is constructed, each beam transporting trolley can be controlled to run back and forth, so that the ultra-long and overweight box girder segments can be transported on the existing bridge conveniently, and the existing bridge can be ensured For example, during the transportation process, there will not be a phenomenon that the axle load exceeds 50 tons (that is, the load-bearing capacity of the upward cross-section of the bridge does not exceed 50 tons), which breaks through the existing bridges in the existing technology that cannot transport ultra-long and overweight box girder segments. (Otherwise, the existing bridge will be damaged or even collapsed when the axle load exceeds 50 tons), which greatly improves the efficiency of beam transport and ensures the efficient construction of the bridge on the bridge.

The present invention greatly improves the bearing capacity of the existing bridge through technical means such as double-width bridge load-bearing, utilizing the track mechanism to distribute the weight of the box girder segments along the longitudinal bridge direction, and provides sufficient transportation for the transport of super-long and over-weight box girder segments. Space and bearing capacity, ensure that the axle load does not exceed the limit, and greatly improve the efficiency of beam transport under the premise of ensuring safety.

Through the rotating support mechanism, the present invention can conveniently temporarily support the transported box girder segments at the intersection of the supporting rails, so that the beam transporting trolley does not bear weight when the beam transporting trolley transfers the rails, which is convenient for the rail transfer and realizes the box girder during rail transfer. The technical effect of the non-rotating beam segment facilitates the transportation of the box girder segment and reduces the energy required for rail transition.

The swivel support mechanism can stand up to support the box girder segment when needed, and can make the swivel support device when the rail transfer operation is not performed, thereby reducing the height and greatly reducing the swivel support device hooking foreign objects, interfering with the operation of the beam transport trolley or the box girder segment. The probability. During the rail transfer operation, the rotating support device can be erected conveniently to temporarily support the box girder segments.

The setting of the relevant structures such as the rail support device, after the beam transport trolley is pushed up and away from the support track, the operator can easily turn the beam transport trolley without manually lifting the beam transport trolley or moving the beam transport trolley to make the beam transport trolley move. The walking wheels correspond to the corresponding support rails on the lower bridge, which makes it easier and faster to complete the rail transition.

The first limit switch and the second limit switch enable the electronic control device to precisely control the start and stop of the forward and reverse frequency conversion motors, so as to precisely control the rotation position of the rotary support device.

The electronic control device is connected with each controlled device through the second wireless communication module, which is convenient for the operator to carry the electronic control device to follow the beam transport trolley to move, and to control during the movement.

By adopting the safe and energy-saving beam transporting method for bridge construction on the bridge of the present invention, the beam transporting trolley can realize the rail shifting operation without rotating the transported box girder segment during the transporting the beam onto the bridge, which is very convenient and quick, and saves the rotating overweight box The energy required by the beam section saves the materials and costs required for the special construction of beam transport channels, etc., and there is no need to specially plan the working space for the rotation of the ultra-long box girder section, which can not only improve the construction efficiency, but also have significant energy saving The effect of environmental protection is to avoid the waste of materials and environmental pollution caused by the construction of beam transport channels.

Description of drawings

Figure 1 is the floor plan of the girder yard for bridge construction and the existing bridge (viewing direction);

Fig. 2 is the B-B sectional schematic diagram of Fig. 1;

Fig. 3 is the structural schematic diagram of the bridge transfer structure on the transport beam, that is, the structural schematic diagram of the intersection of the auxiliary road and the lower bridge;

Fig. 4 is the enlarged schematic diagram of the place A in Fig. 3, namely the enlarged schematic diagram of the intersection of the rail mechanism;

Fig. 5 is the structural representation of the rotating support mechanism when the rotating support device is in the lying down position;

6 is a schematic structural diagram of the rotary support mechanism when the rotary support device is in a vertical position;

Fig. 7 is the structural representation of the beam transport trolley on the track mechanism;

Fig. 8 is the electric control principle diagram of the present invention;

FIG. 9 is a plan layout view of the first to fourth track mechanisms on the lower bridge;

10 is a schematic top view of the first to sixth track mechanisms;

FIG. 11 is a cross-sectional view taken along line AA of FIG. 10 .

Detailed ways

As shown in FIG. 1 to FIG. 11 , the present invention provides a method for safe and energy-saving beam transportation on a bridge, which is carried out through a bridge building and transportation system on the bridge.

The existing bridge is the lower-level bridge, and the new bridge is the upper-level bridge. The bridge-building and transporting beam system on the bridge includes a rail-conveying beam structure for transporting the box girder segment 9 from the beam yard 23 to the lower-level bridge 24, and a transport beam structure for transporting the box girder segment 9 from the beam yard 23 to the lower deck bridge 24. The along-bridge transport structure for transporting the beam segment 9 along the lower bridge 24 to the construction site;

The lower bridge 24 includes the left bridge deck 3 (ie the bridge deck of the left bridge) and the right bridge deck 4 (ie the bridge deck of the right bridge) for vehicles traveling in the opposite direction, the left bridge deck 3 and the right bridge There is an isolation belt 2 between the surfaces 4;

The rail transfer beam structure includes the lower bridge 24, the lower bridge 24 is provided with a track mechanism along the length direction of the lower bridge 24; The auxiliary road 25 connects the beam field 23 and the lower bridge 24; the auxiliary road 25 is constructed at the lower position of the lower bridge 24, preferably where the lower bridge 24 meets the horizontal road surface, at this time, there will be no diagram in the auxiliary road 25 Inclined segment shown in 2.

An auxiliary rail mechanism is provided on the auxiliary road 25, and the auxiliary rail mechanism intersects with the rail mechanism; the rail mechanism of the lower bridge 24 includes the first to fourth rail mechanisms 5, 6, 7, 8;

The auxiliary rail mechanism on the auxiliary road 25 includes the fifth and sixth rail mechanisms 26, 27 arranged in parallel; the fifth and sixth rail mechanisms 26, 27 are respectively connected with the first to fourth rail mechanisms 5, 6, 7, 8 intersect and form 8 intersections;

The first to sixth track mechanisms 5, 6, 7, 8, 26, and 27 are all used for the beam-carrying trolley 1 to travel;

On the lower bridge 24, the length direction of the lower bridge 24 is the front and rear direction, and the beam transport direction is the forward direction; on the auxiliary road 25, the length direction of the auxiliary road 25 is the front and rear direction, and the beam transport direction is the forward direction;

The structures of each track mechanism (ie, the first to sixth track mechanisms) are the same, including a left-rail mechanism and a right-rail mechanism; the left-rail mechanism and the right-rail mechanism have the same structure, including a concrete foundation 12 laid in the front-rear direction, The top of the concrete foundation 12 is fixedly connected with a support track 13 upward in the middle of the left-right direction; the support track 13 is used to support the beam transport trolley 1;

At the intersection of each track mechanism, the concrete foundations 12 of the two intersecting track mechanisms are horizontally connected, and a square support block 28 is provided on the concrete foundation 12 where the support rails 13 intersect at the intersection position. The sides of the support block 28 The tops of the two supporting rails 13 that are long and intersecting are the same width; There are gaps between the four sides of the block 28 and the supporting rails 13 facing it, and the gaps are the same, and the gap is less than or equal to a quarter of the diameter of the traveling wheels 16 of the beam transporting trolley 1;

The beam transport trolley 1 is respectively provided with a pushing device 21 for supporting the box girder segment 9 to be transported. The top of the pushing device 21 is higher than the isolation belt 2; The top of the ejector rod 10 is hinged with a support plate 11 for supporting the box girder section 9 to be transported;

The transport structure along the bridge includes the first to fourth track mechanisms 5, 6, 7, 8 and the beam transport trolley 1;

The first track mechanism 5 and the second track mechanism 6 are arranged on the left deck 3 and form the left deck 3 track mechanism, and the third track mechanism 7 and the fourth track mechanism 8 are arranged on the right deck 4 and constitute The right bridge deck 4 track mechanism; the left bridge deck 3 track mechanism and the right deck 4 track mechanism are symmetrically arranged with respect to the isolation belt 2 .

The beam transporting trolley 1 includes a horizontally arranged vehicle frame 14. The four corners of the vehicle frame 14 are respectively equipped with the walking wheels 16 through the axles 15. The vehicle frame 14 is provided with a motor 17, and the motor 17 is connected to the axles of each walking wheel 16 through a transmission mechanism. 15. Transmission connection; the frame 14 is provided with the pushing device 21 and the top of the pushing device 21 is higher than the isolation belt 2 .

The motor 17 drives the traveling wheel 16 through the transmission mechanism, which is a conventional structure, and the specific structure of the transmission mechanism will not be described in detail.

A rotating support mechanism 30 is provided on the lower deck where the tracks intersect;

The rotating support mechanism 30 includes a bottom plate 31, a bracket 32 is arranged on the bottom plate 31, a forward and reverse frequency conversion motor 33 is arranged on the bottom plate 31 on one side of the bracket 32, and a rotating support device 34 is hinged on the bottom plate 31 on the other side of the bracket 32 to rotate. The support device 34 is a hydraulic cylinder or an electric push rod or an air cylinder; the extending rod of the rotary support device 34 is hinged with a bearing plate 35 for temporary support;

The output shaft of the forward and reverse frequency conversion motor 33 is connected with a traction rope 36, and the top of the bracket 32 is provided with a fixed pulley 37. The traction rope 36 bypasses the fixed pulley 37 and is connected with the upper side of the rotating support device 34. A return spring 38 is connected to the other side of the upper part, and the return spring 38 is connected to the bottom plate 31 .

A first travel switch 39 is disposed on the side of the bracket 32 adjacent to the rotating support device 34, and a second travel switch 40 corresponding to the rotating support device 34 is disposed on the bottom plate 31;

The rotating support device 34 has a lying down position and a vertical position; when the rotating support device 34 is in the lying down position, the second travel switch 40 is pressed, and the return spring 38 is in a relaxed state or a compressed state at this time; the rotating support device 34 is in a lying down position In the lying down position, it is lower than the box girder segment 9 transported by the beam transport trolley 1;

When the rotary support device 34 is in the vertical position, the first travel switch 39 is pressed, the return spring 38 is in a stretched state at this time, and the bearing plate 35 is facing upward; the rotary support device 34 is in the vertical position and its extension rod is in a retracted state When the load bearing plate 35 is lower than the box girder segment 9 transported by the beam transport trolley 1 .

Both the first travel switch 39 and the second travel switch 40 are preferably push-type travel switches, or a travel switch with a button lever, both of which are in the prior art, and the specific structures will not be repeated.

The middle of the frame 14 of the beam transport trolley 1 is downwardly connected with a support groove 41 with an open bottom, the inner groove wall of the support groove 41 is rotatably connected with a rotating plate 43 through a bearing 42 , and the rotating plate 43 is slidingly matched with the lower side wall of the support groove 41 . Therefore, the lower side wall of the support groove 41 can support the rotating disk 43 upward; the middle of the rotating disk 43 is connected with a rotating rail support device 44 downward, and the rotating rail supporting device 44 is a hydraulic cylinder or an electric push rod or cylinder; Out of the rod, the extension rod of the swivel support device 44 extends downward and is connected with the support plate 45 on the lower bridge deck supported at the intersection of the rail mechanism.

With the arrangement of the related structures such as the rail shifting support device 44, after the beam transporting trolley 1 is pushed up and away from the support track 13, the operator can easily rotate the beam transporting trolley 1 without manually lifting the beam transporting trolley 1 or moving the beam transporting trolley 1. The traveling wheels 16 of the beam transporting trolley 1 can be made to correspond to the corresponding supporting rails 13 on the lower bridge 24, so that the rail transfer operation can be completed more easily and quickly.

The motor 17 on each beam transporting trolley 1 adopts a variable frequency deceleration motor; each beam transporting trolley 1 is provided with a first wireless communication module 18; The battery 22 and the second wireless communication module 20 are connected; the rail shifting support device 44, the rotating support device 34, the forward and reverse frequency conversion motor 33, the first travel switch 39 and the second travel switch 40 are all connected to the third wireless communication module 46. ; The electronic control device 19 preferably adopts a PLC, and can also adopt the form of an integrated circuit, a notebook computer and the like. The first wireless communication module 18 , the second wireless communication module 20 and the third wireless communication module 46 may adopt a wifi module, a Bluetooth module, a zigbee module, etc., preferably a zigbee module.

The motor 17 and the pushing device 21 on each beam transporting trolley 1 are connected with the first wireless communication module 18, and the third wireless communication module 46 and the first wireless communication module 18 on each beam transporting trolley 1 are respectively connected through the second wireless communication module 18. The communication module 20 is connected to the electronic control device 19 .

The pushing device 21 , the rail support device 44 and the rotation support device 34 are all electric push rods or hydraulic cylinders or air cylinders. When a hydraulic cylinder is used, the corresponding hydraulic mechanism includes a hydraulic pump station and a hydraulic cylinder. The hydraulic cylinder is connected to the control valve group (electromagnetic valve group) in the hydraulic pump station through pipelines, and the electronic control device 19 communicates with the hydraulic pump station through the second wireless communication device. The hydraulic pump in the hydraulic pump station is connected with the control valve group.

The safety and energy-saving beam transportation method for bridge construction on the bridge of the present invention is carried out according to the following steps:

The beam field 23 is provided with a gantry crane; in the initial state, the rotating support device 34 is in the lying down position;

The first step is the lifting step;

Make the eight beam transporting trolleys 1 drive to the position corresponding to the beam yard 23 on the auxiliary rail mechanism corresponding to the beam yard 23, and the relative positions of the eight beam transporting trolleys 1 to each other and the 8 intersections of the rail mechanism. The relative positions between the two are the same;

Use the gantry crane of the beam field 23 to lift the box girder section 9 used for the construction of the upper bridge to 8 beam transport trolleys 1. width direction) is perpendicular to the beam transport direction of the lower bridge 24;

The second step is the step of going to the bridge; the frequency conversion deceleration motor on each beam transporting trolley 1 is activated by the electronic control device 19, and each beam transporting trolley 1 carrying the box girder segment 9 is driven to start synchronously and make each beam transporting trolley 1 run to the track. At the 8 intersections of the mechanism, the traveling wheels 16 of each beam transporting trolley 1 are respectively supported on the support blocks 28 at the corresponding intersection positions;

The third step is the temporary support step;

The forward and reverse frequency conversion motors 33 of each rotating support mechanism 30 are activated synchronously, so that the forward and reverse frequency conversion motors 33 pull the rotating support device 34 through the traction rope 36 to rotate to the vertical position, and each rotating support device 34 presses the first stroke switch at this time. 39. At the same time, the return springs 38 of each rotary support mechanism 30 are in a stretched state; after the rotary support device 34 presses the first travel switch 39, the electronic control device 19 controls the corresponding forward and reverse frequency conversion motors 33 to stop, and controls the corresponding rotation The extension rod of the support device 34 extends upward, so that the bearing plate 35 is pressed upward and supports the box girder segment 9;

The fourth step is the rail change step of the beam transport trolley 1;

The electric control device 19 controls the ejector rod 10 of the ejector device 21 of the beam transporting trolley 1 to retract downward. At this time, the box girder segment 9 is supported by each rotating support mechanism 30, and the beam transporting trolley 1 is in a free state; The beam transport trolley 1 makes the traveling wheels 16 of each beam transport trolley 1 correspond to the corresponding support rails 13 on the lower bridge 24;

The fifth step is to release the temporary support step;

The electric control device 19 controls the push rod 10 of the push device 21 of the beam transport trolley 1 to extend upward, so that the support plate 11 pushes upward and supports the box girder segment 9;

Then, the electric control device 19 controls the forward and reverse frequency conversion motors 33 of each rotary support mechanism 30 to reverse, and under the pulling force of each return spring 38, each rotary support device 34 rotates to the lying down position. The rotational speed of the frequency conversion motor 33 controls the rotational speed of the rotating support device 34;

After the rotary support device 34 presses the second travel switch 40, the electronic control device 19 controls the corresponding forward and reverse frequency conversion motor 33 to stop, and the step of releasing the temporary support is completed;

The sixth step is the beam transporting step; the staff controls the synchronous operation of each beam transporting trolley 1 through the electronic control device 19, and transports the box girder segment 9 along the lower deck to the construction position;

The seventh step is the return step of the beam transport trolley 1;

After the box girder segment 9 is lifted by the construction machine at the construction position, the staff controls each beam transport trolley 1 to return to the 8 intersections of the track mechanism through the electronic control device 19;

Then the operator rotates each beam transporting trolley 1, so that the traveling wheels 16 of each beam transporting trolley 1 correspond to the corresponding support rails 13 on the auxiliary road 25;

The electronic control device 19 controls the frequency conversion deceleration motor on each beam transporting trolley 1, and drives each beam transporting trolley 1 to run synchronously to the position corresponding to the beam field 23 on the auxiliary rail mechanism;

The first to seventh steps are repeated, and the box girder segment 9 is continuously transported to the construction site.

The length direction of the box girder section 9 is perpendicular to the beam transport direction of the lower bridge 24, and the length direction of the box girder section 9 is the width direction of the upper bridge, which is convenient for the box girder section 9 to span the double-width bridge decks traveling in the opposite direction at the same time. Therefore, the weight of the overweight box girder section 9 can be shared by the opposite-running double-width bridge decks, so that the carrying capacity of the lower bridge 24 can be doubled.

The staff synchronously controls the working frequency of the variable frequency deceleration motor of each beam transporting trolley 1 through the electronic control device 19, so as to synchronously adjust the running speed of each beam transporting trolley 1 to a predetermined speed, so that each beam transporting trolley 1 runs at the same speed.

In the first step, the box girder segment 9 is hoisted before each beam transporting trolley 1, and the staff controls the jacking device 21 on each beam transporting trolley 1 through the electronic control device 19 to adjust the jacking of each jacking device 21. The upper and lower telescopic positions of the push rod 10 make the support plates 11 of the pushing devices 21 of each beam transporting trolley 1 in the same horizontal position;

After the box girder segments 9 to be transported are hoisted onto the beam transport trolleys 1, the staff controls the jacking devices 21 through the electric control device 19, and adjusts the up and down telescopic positions of the jacking rods 10 of the jacking devices 21, so that each The support plates 11 of the pushing device 21 of the beam transport trolley 1 are all pressed against the box girder segment 9;

In the second, sixth and seventh steps, the staff synchronously controls the working frequency of the variable frequency deceleration motor of each beam transporting trolley 1 through the electronic control device 19, so as to synchronously adjust the running speed of each beam transporting trolley 1 to a predetermined level speed, so that each beam transport trolley 1 runs at the same speed.

In the fourth step, that is, the rail changing step of the beam transporting trolley 1, before the operator rotates each beam transporting trolley 1, the electronic control device 19 controls the rail shifting supporting device 44 of each beam transporting trolley 1, so that the extension of the shifting rail supporting device 44 is made. The rod protrudes downward, so that the support plate 45 is supported on the lower bridge deck; continue to make the extension rod of the swivel support device 44 protrude downward, so that the swivel support device 44 pushes the frame 14 of the beam transport trolley 1 upward, Until each traveling wheel 16 of the beam transporting trolley 1 leaves the support block 28 upward;

Then the operator manually rotates each beam transporting trolley 1, so that the frame 14 and the support groove 41 of each beam transporting trolley 1 rotate around the rotating plate 43 until the traveling wheels 16 of each beam transporting trolley 1 and the first to fourth track mechanisms 5 , 6, 7, 8 on the corresponding support rails 13 correspond.

In the seventh step, that is, the step of returning the beam transporting trolley 1, before the operator rotates each beam transporting trolley 1, the electronic control device 19 controls the rail shifting support device 44 of each beam transporting trolley 1, so that the extension rod of the shifting rail supporting device 44 is Extend downward to make the support plate 45 support on the lower bridge deck; continue to extend the extension rod of the swivel support device 44 downward, so that the swivel support device 44 pushes the frame 14 of the beam transport trolley 1 upward until The traveling wheels 16 of the beam transport trolley 1 leave the support block 28 upward;

Then the operator manually rotates each beam transporting trolley 1, so that the frame 14 and the support groove 41 of each beam transporting trolley 1 rotate around the rotating plate 43 until the traveling wheels 16 of each beam transporting trolley 1 and the fifth and sixth rail mechanisms 26 , 27 correspond to the corresponding support rails 13 .

Since the bottom surface of the box girder segment 9 may not be absolutely horizontal, after the box girder segment 9 is hoisted to each beam transport trolley 1, each support plate 11 will be in contact with the bottom surface of the box girder segment 9 according to the condition of the Adaptive rotation is performed to ensure good contact between the support plate 11 and the box girder segment 9 to avoid damage to the support plate 11 or the bottom surface of the box girder segment 9 due to the included angle between the support plate 11 and the bottom surface of the box girder segment 9 . At this time, the contact between some support plates 11 and the box girder segment 9 may not be close enough. At this time, adjust the up and down telescopic positions of the ejector rods 10 of each ejector The support plates 11 are pressed against the box girder segments 9, which can ensure that the pushing devices 21 of each beam transporting trolley 1 all play a good supporting role.

The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced without departing from the Any modification or partial replacement of the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims (4)

1. The safe and energy-saving beam transporting method for building the bridge on the bridge is carried out by building a bridge transporting system on the bridge, the existing bridge is a lower-layer bridge, and the newly-built bridge is an upper-layer bridge, and is characterized in that: the on-bridge construction and bridge transportation system comprises a transfer rail transportation structure used for transporting box girder segments from a girder yard to a lower bridge and an along-bridge transportation structure used for transporting the box girder segments to a construction position along the lower bridge;

the lower layer bridge comprises a left amplitude bridge surface and a right amplitude bridge surface which are used for vehicles to oppositely run, and an isolation belt is arranged between the left amplitude bridge surface and the right amplitude bridge surface;

the transfer rail beam transporting structure comprises the lower layer bridge, and a rail mechanism is arranged on the lower layer bridge along the length direction of the lower layer bridge; a beam field is arranged on one side of the lower layer bridge, an auxiliary channel is arranged at the beam outlet end of the beam field, and the auxiliary channel is connected with the beam field and the lower layer bridge;

the auxiliary track is provided with an auxiliary track mechanism which is crossed with the track mechanism; the track mechanism of the lower layer bridge comprises a first track mechanism, a second track mechanism, a third track mechanism, a fourth track mechanism and a fourth track mechanism which are arranged in parallel,

the auxiliary rail mechanism on the auxiliary road comprises a fifth rail mechanism and a sixth rail mechanism which are arranged in parallel; the fifth and sixth track mechanisms are respectively crossed with the first to fourth track mechanisms to form 8 crossed parts;

the first to sixth track mechanisms are all used for the beam transporting trolley to run;

the length direction of the upper layer bridge and the lower layer bridge on the lower layer bridge is the front-back direction, and the beam transporting direction is the front direction; the length direction of the auxiliary road is taken as the front-back direction on the auxiliary road, and the beam transporting direction is taken as the front direction;

the structures of all the track mechanisms are the same and all the track mechanisms comprise a left track mechanism and a right track mechanism; the left rail mechanism and the right rail mechanism are identical in structure and respectively comprise a concrete foundation laid along the front-back direction, and a supporting rail is fixedly connected to the top of the concrete foundation upwards in the middle of the left-right direction; the support track is used for supporting the beam conveying trolley;

at the intersection of each track mechanism, the concrete foundations of the two intersected track mechanisms are horizontally connected, a square supporting block is arranged on the concrete foundation at the intersection position of the intersection of the supporting tracks, and the side length of the supporting block is as wide as the tops of the two intersected supporting tracks; the four edges of the supporting block are respectively opposite to the supporting tracks on one side of the fracture, gaps are respectively formed between the four edges of the supporting block and the opposite supporting tracks, the gaps are the same, and the gaps are less than or equal to one fourth of the diameter of the walking wheels of the beam transporting trolley;

pushing devices for supporting the transported box girder sections are respectively arranged on the girder transporting trolleys, and the tops of the pushing devices are higher than the isolation belts; the pushing device is provided with a pushing rod capable of stretching up and down, and the top of the pushing rod is hinged with a supporting plate for supporting the transported box girder segment;

the along-bridge conveying structure comprises the first to fourth track mechanisms and the beam conveying trolley;

the first track mechanism and the second track mechanism are arranged on the left bridge deck and form a left bridge deck track mechanism, and the third track mechanism and the fourth track mechanism are arranged on the right bridge deck and form a right bridge deck track mechanism; the left bridge deck track mechanism and the right bridge deck track mechanism are symmetrically arranged around the isolation belt;

the beam transporting trolley comprises a horizontally arranged frame, the walking wheels are respectively arranged at the four corners of the frame through wheel shafts, a motor is arranged on the frame, and the motor is in transmission connection with the wheel shafts of the walking wheels through a transmission mechanism; the top of the frame provided with the pushing device of the pushing device is higher than the isolation belt;

a rotary supporting mechanism is arranged on the lower bridge floor at the intersection of the rails;

the rotary supporting mechanism comprises a bottom plate, a support is arranged on the bottom plate, a forward and reverse rotating variable frequency motor is arranged on the bottom plate on one side of the support, a rotary supporting device is hinged to the bottom plate on the other side of the support, and the rotary supporting device is a hydraulic cylinder or an electric push rod or an air cylinder; an extension bar of the rotary supporting device is hinged with a bearing plate for temporary supporting;

the output shaft of the forward and reverse rotation variable frequency motor is connected with a traction rope, the top of the bracket is provided with a fixed pulley, the traction rope bypasses the fixed pulley and is connected with one side of the upper part of the rotary supporting device, the other side of the upper part of the rotary supporting device is connected with a return spring, and the return spring is connected with the bottom plate;

a first travel switch is arranged on one side of the bracket adjacent to the rotary supporting device, and a second travel switch corresponding to the rotary supporting device is arranged on the bottom plate;

the rotary supporting device is provided with a horizontal position and a vertical position; when the rotary supporting device is in a lying position, the second travel switch is pressed, and at the moment, the return spring is in a relaxation state or a compressed state; the rotary supporting device is lower than the box girder segment conveyed by the girder conveying trolley when in a horizontal position;

when the rotary supporting device is in a vertical position, the first travel switch is pressed, the return spring is in a stretching state, and the bearing plate is over against the upper part; when the rotary supporting device is in a vertical position and an extension rod of the rotary supporting device is in a contraction state, the bearing plate is lower than a box girder segment conveyed by the girder conveying trolley;

the middle part of the frame of the beam conveying trolley is downwards connected with a supporting groove with an opening at the bottom, the groove wall of the supporting groove is rotatably connected with a rotating disc through a bearing, and the rotating disc is in sliding fit with the lower side wall of the supporting groove; the middle part of the rotating disc is downwards connected with a transition support device which is a hydraulic cylinder or an electric push rod or an air cylinder; the transfer rail supporting device is provided with an extension rod, the extension rod of the transfer rail supporting device extends downwards and is connected with a supporting disk, and the gravity center of the beam transporting trolley is positioned right above the transfer rail supporting device;

the motors on the beam conveying trolleys adopt variable-frequency speed reduction motors; each beam conveying trolley is provided with a first wireless communication module; a movable electric control device is arranged outside the beam transporting trolley and is connected with a storage battery and a second wireless communication module; the transition support device, the rotary support device, the forward and reverse rotation variable frequency motor, the first travel switch and the second travel switch are connected with the third wireless communication module;

the motor and the pushing device on each beam transporting trolley are connected with the first wireless communication module, and the third wireless communication module and the first wireless communication module on each beam transporting trolley are respectively connected with the electric control device through the second wireless communication module;

the safe and energy-saving beam transporting method for building the bridge on the bridge comprises the following steps:

the beam yard is provided with a gantry crane; the rotary supporting device is in a lying position in an initial state;

the first step is a lifting step;

8 beam transporting trolleys are driven to the positions, corresponding to the beam yard, on the auxiliary rail mechanisms corresponding to the beam yard, and the relative positions of the 8 beam transporting trolleys are the same as the relative positions of the intersections of the 8 positions of the rail mechanisms;

hoisting box girder segments for constructing upper bridges to 8 girder transporting trolleys by using gantry cranes of a girder yard, wherein the length direction of the box girder segments is vertical to the girder transporting direction of the lower bridges;

the second step is a bridge mounting step; the variable-frequency speed reducing motors on the girder transporting trolleys are started through the electric control device, the girder transporting trolleys of the bearing box girder segment are driven to be synchronously started, and the girder transporting trolleys run to the 8-position cross position of the track mechanism, and the travelling wheels of the girder transporting trolleys are respectively supported on the supporting blocks at the corresponding cross position;

the third step is a temporary supporting step;

synchronously starting the forward and reverse rotation variable frequency motors of the rotary supporting mechanisms, enabling the forward and reverse rotation variable frequency motors to pull the rotary supporting devices to rotate and rise to vertical positions through traction ropes, pressing a first travel switch by each rotary supporting device at the moment, and simultaneously enabling the reset springs of the rotary supporting mechanisms to be in a stretching state; after the rotary supporting device presses the first travel switch, the electric control device controls the corresponding forward and reverse variable frequency motor to stop and controls the extension rod of the corresponding rotary supporting device to extend upwards, so that the bearing plate upwards presses and supports the box girder segment;

the fourth step is a rail changing step of the beam conveying trolley;

the electric control device controls a pushing rod of a pushing device of the beam transporting trolley to retract downwards, at the moment, the box girder segment is supported by each rotary supporting mechanism, and the beam transporting trolley is in a free state; an operator rotates each beam transporting trolley to enable the travelling wheels of each beam transporting trolley to correspond to the corresponding support rails on the lower-layer bridge;

the fifth step is a temporary support releasing step;

the electric control device controls a pushing rod of a pushing device of the beam conveying trolley to extend upwards, so that the supporting plate upwards pushes and bears the box girder segment;

then the electric control device controls the positive and negative rotation variable frequency motors of the rotation supporting mechanisms to rotate reversely, each rotation supporting device rotates to a horizontal position under the action of the tension of each reset spring, and the rotation speed of the rotation supporting devices is controlled by controlling the rotation speed of the positive and negative rotation variable frequency motors in the process;

after the rotary supporting device presses the second travel switch, the electric control device controls the corresponding forward and reverse variable frequency motor to stop, and the step of removing the temporary support is completed;

the sixth step is a beam transporting step; workers control all the beam conveying trolleys to synchronously run through the electric control device, and convey the box girder segments to a construction position along the lower deck;

the seventh step is that the beam transporting trolley returns to the step;

after the box girder segment is hoisted by the construction machinery at the construction position, workers control each girder transporting trolley to return to the intersection of 8 parts of the track mechanism through an electric control device;

then, the operator rotates each beam transporting trolley to enable the travelling wheels of each beam transporting trolley to correspond to the corresponding supporting tracks on the auxiliary road;

the electric control device controls the variable-frequency speed reducing motors on the beam transporting trolleys to drive the beam transporting trolleys to synchronously run to the positions, corresponding to the beam field, on the auxiliary rail mechanism;

and repeating the first step to the seventh step, and continuously conveying the box girder segments to the construction position.

2. The method of claim 1, wherein: in the first step, before hoisting the box girder segments to each girder transporting trolley, a worker controls the pushing devices on each girder transporting trolley through the electric control device, and adjusts the up-down telescopic positions of the pushing rods of each pushing device to enable the supporting plates of the pushing devices of each girder transporting trolley to be in the same horizontal position;

after the box girder segments to be transported are hoisted to each girder transporting trolley, a worker controls the pushing devices through the electric control device, adjusts the up-down telescopic positions of the pushing rods of the pushing devices, and enables the supporting plates of the pushing devices of the girder transporting trolleys to be pressed against the box girder segments;

in the second step, the sixth step and the seventh step, the working frequency of the variable-frequency speed reduction motor of each beam transporting trolley is synchronously controlled by a worker through the electric control device, so that the running speed of each beam transporting trolley is synchronously adjusted to a preset speed, and each beam transporting trolley runs at the same speed.

3. The method of claim 1, wherein: in the fourth step, namely the rail changing step of the beam transporting trolleys, before the operators rotate the beam transporting trolleys, the electric control device controls the rail transferring supporting devices of the beam transporting trolleys to enable the extension rods of the rail transferring supporting devices to extend downwards and enable the supporting disks to be supported on the lower bridge floor; continuing to extend the extension rod of the transfer rail supporting device downwards, so that the transfer rail supporting device upwards presses the frame of the beam transporting trolley until the walking wheels of the beam transporting trolley upwards leave the supporting block;

then, the operator manually rotates each beam transporting trolley to enable the frame and the supporting groove of each beam transporting trolley to rotate around the rotating disc until the traveling wheels of each beam transporting trolley correspond to the corresponding supporting tracks on the first to fourth track mechanisms.

4. A method of erecting a bridge according to any one of claims 1 to 3 wherein: in the seventh step, namely the beam transporting trolley returning step, before the operator rotates each beam transporting trolley, the electric control device controls the transfer rail supporting device of each beam transporting trolley to ensure that the extension rod of the transfer rail supporting device extends downwards and the supporting disc is supported on the lower deck; continuing to extend the extension rod of the transfer rail supporting device downwards, so that the transfer rail supporting device upwards presses the frame of the beam transporting trolley until the walking wheels of the beam transporting trolley upwards leave the supporting block;

and then, the operator manually rotates each beam transporting trolley to enable the frame and the supporting groove of each beam transporting trolley to rotate around the rotating disc until the traveling wheels of each beam transporting trolley correspond to the corresponding supporting tracks of the fifth and sixth track mechanisms.

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