阅读说明：本技术 钢箱梁提运架系统及其施工方法 (Steel box girder lifting and transporting frame system and construction method thereof ) 是由 赵立财 于 2021-07-30 设计创作，主要内容包括：本公开涉及钢箱梁提运架系统及其施工方法,该钢箱梁提运架系统包括运梁轨道、牵引机构、浮吊机构以及吊梁机构；运梁轨道设于岸边的坡面上,且沿坡面的方向延伸至岸边上设置的第一桥墩处；牵引机构位于运梁轨道上且靠近第一桥墩设置；浮吊机构将钢箱梁吊送至运梁轨道上；吊梁机构位于水面上方且与预设吊起位置相对应。本公开的钢箱梁提运架系统,可以通过岸侧的坡面上设置运梁轨道,从而通过浮吊机构将钢梁箱吊送至运梁轨道靠近水面的一端后,再通过运梁轨道上设置的牵引机构将钢梁箱沿着运梁轨道牵引至预设吊起位置,且运梁轨道自水面朝向第一桥墩延伸,从而可以使得钢梁箱能够被运送至桥墩处从而便于后续架设。(The disclosure relates to a steel box girder lifting and transporting frame system and a construction method thereof, wherein the steel box girder lifting and transporting frame system comprises a girder transporting track, a traction mechanism, a floating crane mechanism and a girder hoisting mechanism; the beam transporting track is arranged on a slope surface on the bank side and extends to a first pier arranged on the bank side along the direction of the slope surface; the traction mechanism is positioned on the beam conveying track and is close to the first bridge pier; the steel box girder is hoisted to the girder transporting track by the floating crane mechanism; the hanging beam mechanism is positioned above the water surface and corresponds to the preset hanging position. The steel box girder lifting and transporting frame system can be provided with the girder transporting track on the slope surface of the bank side, so that after the steel box girder is lifted to one end, close to the water surface, of the girder transporting track through the floating crane mechanism, the steel box girder is pulled to a preset lifting position along the girder transporting track by the traction mechanism arranged on the girder transporting track, the girder transporting track extends from the water surface towards the first bridge pier, and the steel box girder can be transported to the bridge pier position so as to be subsequently erected.)

1. A steel box girder lifting and transporting frame system is characterized by comprising a girder transporting track (1), a traction mechanism (2), a floating crane mechanism (3) and a girder hoisting mechanism (4);

the beam transporting track (1) is arranged on a slope surface of a bank side (51) of the water surface (5) and extends to a first pier (52) arranged on the bank side (51) along the inclined direction of the slope surface;

the traction mechanism (2) is positioned on the beam conveying track (1) and is close to the first pier (52);

the floating crane mechanism (3) floats on the water surface (5) and is used for hoisting a steel box girder (6) to one end of the girder transporting track (1) far away from the first pier (52) so that the steel box girder (6) moves to a preset hoisting position along the girder transporting track (1) under the traction of the traction mechanism (2);

the hanging beam mechanism (4) is located above the water surface (5) and corresponds to the preset hanging position, and is used for hanging and erecting the steel beam box (6) conveyed to the position below the hanging beam mechanism (4).

2. The steel box girder lifting frame system according to claim 1, further comprising a girder transport vehicle (21), wherein the girder transport vehicle (21) is disposed on the girder transport rail (1) and connected with the traction mechanism (2) such that the floating crane mechanism (3) lifts the steel girder box (6) onto the girder transport vehicle (21), and the traction mechanism (2) pulls the girder transport vehicle (21) to move along the girder transport rail (1) to the preset lifting position.

3. The steel box girder lifting frame system according to claim 2, wherein the traction mechanisms (2) comprise two, the two traction mechanisms (2) are arranged at intervals along a direction perpendicular to the length extension direction of the girder rail (1), and the two traction mechanisms (2) are respectively connected with two sides of the girder transporting vehicle (21).

4. A steel box girder lifting frame system according to claim 1, wherein the floating crane means (3) comprises a floating base (31) floating on the water surface (5) and a floating crane assembly (31) provided on the floating base (32), the floating crane assembly (31) being adapted to lift the steel box girder (6) onto the girder rail (1) and being rotatable relative to the floating base (32).

5. A steel box girder lifting frame system according to claim 1, wherein the lifting beam mechanism (4) comprises a lifting beam assembly (41) and a travelling wheel (42) arranged at the bottom of the lifting beam assembly (41), the lifting beam assembly (41) being used for lifting the steel box girder (6) for erection and being movable to a position corresponding to the preset lifting position by the travelling wheel (42).

6. A construction method for a lifting frame of a steel box girder using the steel box girder lifting frame system according to any one of claims 1 to 5, comprising the steps of:

laying a beam transporting track on a slope surface on the bank side of the water surface; the beam transporting track extends to a first pier arranged on the bank side along the direction of the slope;

conveying the steel box girder to the girder conveying track through a floating crane mechanism;

drawing the steel beam box on the beam conveying track to a preset hoisting position through a drawing mechanism;

hoisting and assembling the steel beam box pulled to the preset hoisting position through a beam hoisting mechanism;

and welding and fixing the assembled steel beam box through a stay cable to complete erection.

7. The construction method according to claim 6, wherein prior to the step of laying the girder rail on the bank-side slope surface, the method further comprises:

and a support is arranged on one side of the first pier, which is far away from the water surface, and a beam storage platform is erected between the support and the first pier.

8. The construction method according to claim 7, wherein the step of hoisting and assembling the steel beam box at the preset hoisting position by the hoisting beam mechanism comprises:

sequentially hoisting the steel girder boxes to the girder storage platform above the first bridge pier;

and hoisting the steel beam box through the beam hoisting mechanism and moving the steel beam box to a preset erection position along the beam storage platform to perform frame assembly respectively.

9. The construction method according to claim 6, wherein after the step of hoisting the girder box delivered to the preset hoisting position by the girder mechanism for erection, the method further comprises:

and connecting the steel beam box with other erected steel beam boxes adjacent to the steel beam box.

Technical Field

The disclosure relates to the technical field of beam carrying and erecting, in particular to a steel box beam carrying and erecting system and a construction method thereof.

Background

With the development of the infrastructure of China, the bridge construction is changed day by day, and particularly the bridge construction in mountainous areas not only solves the traffic problem, but also drives the rapid development of the economy along the line.

Since the mountainous terrain is complicated, the slope surface on the bank side of the water surface has terrains such as a steep slope, and when the bridge is erected above the water surface under the terrains, a pier for erecting the steel beam box is usually arranged on the slope surface on the bank side. However, when the water surface is in a dry season, the girder ship cannot be close to a pier provided at a shore side, and thus cannot transport a girder to the vicinity of the pier for subsequent girder erection operation above a steep slope on a mountain side by hoisting a girder box transported below the pier.

Disclosure of Invention

In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a steel box girder lifting frame system and a construction method thereof.

The invention provides a steel box girder lifting frame system which comprises a girder conveying track, a traction mechanism, a floating crane mechanism and a girder hoisting mechanism;

the beam transporting track is arranged on a slope surface of a bank side of the water surface and extends to a first pier arranged on the bank side along the slope surface direction;

the traction mechanism is positioned on the beam conveying track and is close to the first bridge pier;

the floating crane mechanism floats on the water surface and is used for hoisting and conveying the steel box girder to one end, far away from the first bridge pier, of the girder conveying track, so that the steel box girder moves to a preset hoisting position along the girder conveying track under the traction of the traction mechanism;

and the lifting beam mechanism is positioned above the water surface and corresponds to the preset lifting position, and is used for lifting and erecting the steel beam box conveyed to the lower part of the lifting beam mechanism.

According to an embodiment of the present disclosure, the steel box girder lifting frame system further includes a girder transporting vehicle, the girder transporting vehicle is disposed on the girder transporting track and connected with the traction mechanism, so that the floating crane mechanism lifts the steel box to the girder transporting vehicle, and the traction mechanism pulls the girder transporting vehicle to move to the preset lifting position along the girder transporting track.

According to an embodiment of the disclosure, the traction mechanisms comprise two traction mechanisms, the two traction mechanisms are arranged at intervals along the length extending direction perpendicular to the beam conveying track, and the two traction mechanisms are respectively connected with two sides of the beam conveying vehicle.

According to an embodiment of the present disclosure, the floating crane mechanism includes a floating seat floating on the water surface and a floating crane assembly provided on the floating seat, the floating crane assembly is used for lifting the steel beam box onto the beam transporting track and can rotate relative to the floating seat.

According to an embodiment of the present disclosure, the hanging beam mechanism includes the hanging beam subassembly and locates the walking wheel of hanging beam subassembly bottom, the hanging beam subassembly is used for hanging get the steel beam case erects and the accessible the walking wheel removes to with preset hangs the corresponding position in position.

The present disclosure also provides a construction method, including the steps of:

laying a beam transporting track on a slope surface on the bank side of the water surface; the beam transporting track extends to a first pier arranged on the bank side along the slope surface direction;

conveying the steel box girder to the girder conveying track through a floating crane mechanism;

drawing the steel beam box on the beam conveying track to a preset hoisting position through a drawing mechanism;

hoisting and assembling the steel beam box pulled to the preset hoisting position through a beam hoisting mechanism;

and welding and fixing the assembled steel beam box through a stay cable to complete erection.

According to an embodiment of the disclosure, before the step of laying the girder transporting track on the bank-side slope, the construction method further comprises:

and a support is arranged on one side of the first pier, which is far away from the water surface, and a beam storage platform is erected between the support and the first pier.

According to an embodiment of the present disclosure, the step of hoisting and assembling the steel beam box at the preset hoisting position by the hoisting beam mechanism includes:

sequentially hoisting the steel girder boxes to the girder storage platform above the first bridge pier;

and hoisting the steel beam box through the beam hoisting mechanism and moving the steel beam box to a preset erection position along the beam storage platform for assembly respectively.

According to an embodiment of the present disclosure, after the step of hoisting the girder box transported to the preset hoisting position by the girder hoisting mechanism for assembling, the method of transporting the girder further includes:

and connecting the steel beam box with other erected steel beam boxes adjacent to the steel beam box.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the invention provides a steel box girder lifting frame system and a construction method thereof, wherein the steel box girder lifting frame system comprises a girder conveying track, a traction mechanism, a floating crane mechanism and a girder hoisting mechanism; the beam transporting track is arranged on a slope surface on the bank side and extends to a first pier arranged on the bank side along the direction of the slope surface; the traction mechanism is positioned on the beam conveying track and is close to the first bridge pier; the floating crane mechanism floats on the water surface and is used for hoisting the steel box girder to one end of the girder transporting track far away from the first bridge pier so as to enable the steel box girder to move to a preset hoisting position along the girder transporting track under the traction of the traction mechanism; the hanging beam mechanism is positioned above the water surface and corresponds to the preset hanging position, and is used for hanging and erecting the steel beam box conveyed below the hanging beam mechanism. The steel box girder lifting and transporting frame system can be through setting up fortune roof beam track on the abrupt slope to send the steel beam box to fortune roof beam track through floating crane mechanism and be close to the one end back of the surface of water, the rethread fortune traction mechanism who sets up on the roof beam track pulls the steel beam box to predetermineeing the hoist position along fortune roof beam track, and fortune roof beam track extends towards first pier from the surface of water, thereby can make thereby the steel beam box can be transported near first pier and be convenient for follow-up the erections.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic structural view of a slope surface on a bank side provided with piers according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural view of a beam transporting device according to an embodiment of the present disclosure;

FIG. 3 is a schematic position structure diagram of a beam transporting device in a first flow of the beam transporting method according to the embodiment of the disclosure;

fig. 4 is a schematic structural position diagram of the beam transporting device when the beam transporting method of the embodiment of the disclosure is in the second flow;

fig. 5 is a schematic structural position diagram of the beam transporting device when the beam transporting method of the embodiment of the disclosure is in the third process;

FIG. 6 is a schematic position structure diagram of a beam transporting device when the beam transporting method of the embodiment of the disclosure is in the fourth process;

fig. 7 is a schematic structural position diagram of the beam transporting device when the beam transporting method of the embodiment of the disclosure is in the fifth flow;

FIG. 8 is a side view of a beam transporting apparatus according to an embodiment of the present disclosure;

fig. 9 is a schematic flow chart of a method of transporting a girder according to an embodiment of the present disclosure.

Wherein, 1, a beam transporting track; 11. a stopper; 12. a concrete foundation; 2. a traction mechanism; 21. carrying a beam vehicle; 22. a winch; 3. a floating crane mechanism; 31. a floating crane assembly; 311. floating crane trusses; 312. a hook; 32. a floating seat; 33. a counterweight device; 4. a beam hoisting mechanism; 41. a hanging beam assembly; 411. a hanging beam truss; 412. a spreader; 42. a traveling wheel; 5. a water surface; 51. a bank side; 52. a first bridge pier; 53. a second bridge pier; 6. a steel beam box; 7. a support; 71. a beam storage platform; 72. tying a beam; 73. a cross beam; 74. a stringer; 75. a moving track; 8. a steep slope; 9. and (4) stay cables.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

As shown in fig. 1 to 8, the present disclosure provides a steel box girder lifting frame system, which includes a girder transporting track 1, a traction mechanism 2, a floating crane mechanism 3, and a crane beam mechanism 4; the girder transporting track 1 is arranged on the bank side 51 of the water surface 5, wherein the bank side 51 can also be referred to as a river beach of a lake or a river; the girder transporting track 1 extends to a first pier 52 arranged on the bank side 51 along the direction of the slope surface of the bank side 51; the traction mechanism 2 is positioned on the beam conveying track 1 and is close to the first pier 52; the floating crane mechanism 3 floats on the water surface 5 and is used for hoisting the steel box girder 6 to one end of the beam transporting track 1 close to the water surface 5, so that the steel box girder 5 moves to a preset hoisting position along the beam transporting track 1 under the traction of the traction mechanism 2; the hanging beam mechanism 4 is located above the water surface 5 and corresponds to a preset hanging position, and is used for hanging and erecting the steel beam box 6 conveyed below the hanging beam mechanism 4. According to the steel box girder lifting and transporting frame system, the girder transporting track 1 is arranged on the bank side 51 of the water surface 5, so that the steel box girder 6 is lifted and transported to one end, close to the water surface 5, of the girder transporting track 1 through the floating crane mechanism 3, then the steel box girder 6 is pulled to a preset lifting position along the girder transporting track 1 through the traction mechanism 2 arranged on the girder transporting track 1, the stop block 11 used for stopping the steel box girder 6 is arranged at one end, far away from the water surface 5, of the girder transporting track 1, and the concrete foundation 12 is arranged at the bottom of the girder transporting track 11 and used for supporting the girder transporting track 1; and the girder transporting track extends from the water surface 5 toward the first pier 52, so that the girder box 6 can be transported to the first pier 52 to be conveniently erected between the 0# pier (i.e., the second pier 53) and the 1# pier (i.e., the first pier 52) above the mountain side steep slope 8.

Specifically, as shown in fig. 1, the girder rail 1 is provided on a bank side 51 of the water surface 5, and extends in a slope direction of the bank side 51 to a first pier 52 provided on the bank side 51. Since the ship transporting the steel box girder 6 may have a situation that the first pier 52 cannot be arranged on the slope near the bank in the dry season or the rich season, the steel box girder 6 needs to be transported to the first pier 52 or near the first pier 52 through the girder transporting track 1 so as to perform subsequent erection operation. Therefore, in the present embodiment, the girder transporting track 1 is provided to extend along the shore side 51 to the first pier 52, so that the girder transporting ship can approach the side of the girder transporting track 1 far from the first pier 52 to transport the steel box girder 6 on the girder transporting track 1 to the first pier 52 or any preset hoisting position near the first pier 52 along the girder transporting track 1, where the preset hoisting position refers to a preset erection position above the water surface 5, for example, the steel box girder 6 needs to be erected at a certain position, and the hoisting mechanism 4 can be provided near the certain position to hoist the steel box girder 6 right below the certain position for erection.

As shown in fig. 2, the traction mechanism 2 is located on the girder transporting track 1 and is arranged close to the first pier 52, so that the floating crane mechanism 3 hoists the steel box girder 6 to one end of the girder transporting track 1 close to the water surface 5, so that the steel box girder 6 moves to a preset hoisting position along the girder transporting track 1 under the traction of the traction mechanism 2 for subsequent erection.

As shown in fig. 8, a lateral support 73 is provided above the bracket 7, a longitudinal beam 74 is provided on the lateral support 73, and a moving rail 75 is formed on the longitudinal beam 74 for moving the suspension beam mechanism 4.

As shown in fig. 1 to 2, the erection of the steel girder box between the 0# pier (i.e., the second pier 53) and the 1# pier (i.e., the first pier 52) and between the 1# pier and the 2# pier is specifically described as an example: as shown in fig. 1, the 0# pier to the 1# pier are located on a steep slope 8 of a slope surface of a shore side 51, the 1# pier to the 2# pier are located in a shoal area, and due to the influence of water storage of the water surface, the lowest water level and the highest water level of a construction area of the water surface are 143.3m and 173.3m, so that the ship cannot approach the 1# pier even in a rich water period. In order to enable the hoisting construction of the steel box girder from the 0# pier to the 1# pier and from the 1# pier to the 2# pier to be carried out at the lowest water level, and to avoid introducing an ultra-large floating crane and erecting an ultra-long and high bracket, in the embodiment, the slope-shaped girder transporting track 1 can be adopted for transporting the steel box girder 6, and then the girder hoisting mechanism 4 arranged on the bridge floor is adopted for hoisting the steel box girder 6 for erection. Specifically, two 2m wide bar concrete expansion foundations are adopted for the beam transporting track 1, double tracks and wedge-shaped beam transporting vehicles are arranged above the bar foundations and serve as beam transporting vehicles 21, and the beam transporting vehicles 21 can move on the beam transporting track 1 through traction of the traction mechanism 2. The length of transporting the roof beam car 21 should be greater than the length of girder box 6 to the wedge angle of wedge-shaped transporting the roof beam car 21 is the same with the biggest slope of transporting roof beam track 1, is provided with the antiskid dog that falls after transporting roof beam car 21 and putting on transporting roof beam track 1 for prevent the in-process landing of going up a slope.

In an exemplary embodiment, the traction mechanism 2 may specifically be two winches 22, where the two winches 22 are disposed at intervals along a direction perpendicular to a length extension direction of the girder transportation rail 1, and the two winches 22 are respectively connected with two sides of the girder transportation vehicle 21 and the strokes of the two winches 22 are synchronous, so that the two sides of the girder transportation vehicle 21 can move in a balanced manner under a common traction action of the two winches 22 to prevent one-side rollover. For the selection of the type of the winch 22, the heaviest steel beam box 6 can be specifically started on the steepest position on the beam conveying track 1 by using static friction as a calculation basis, the traction force needs to be kept by more than three times of surplus coefficient, and the selection of the steel wire rope and the traveling wheel set of the winch 22 meets the corresponding hoisting specification requirements. In addition, the winch 22 is fixed by driving in a steel anchor, anchor roots are dug around the winch 22, and a length of three meters of I20 steel is respectively driven in and concrete is poured. The anchoring safety factor calculated by each winch 22 according to the characteristics of the bottom floor is greater than 5.

As shown in fig. 1 and 2, eight pieces of girders (specifically, see fig. 1) are required to be stored when the 0# pier to the 1# pier are located on the steep slope 8 on the mountain side, and since the steel box girders 6 cannot be transported between the 0# pier and the 1# pier, the steel box girders can only be stored on the girder storage platform 71 installed above the 1# pier by spanning the 1# pier by means of the girder hanging mechanism 4. Thus, the suspension beam mechanism 4 includes a suspension beam assembly 41 and a road wheel 42 provided at the bottom of the suspension beam assembly 41, and the suspension beam assembly 41 may include a suspension beam truss 41 and a spreader 412. The hanging beam assembly 41 is used for hanging the steel beam box 6 for erection and can move to a position corresponding to a preset hanging position through the travelling wheels 42, so that the hanging beam assembly 41 can hang the steel beam box 6 to be higher than the top of the 1# pier, the steel beam box 6 is placed on the beam storage platform 71 between the 0# pier and the 1# pier across the top of the 1# pier through the amplitude variation mechanism of the hanging beam assembly 41, and then the steel beam box is placed at the preset position through sliding.

As shown in fig. 2, the floating crane mechanism 3 includes a floating base 32 floating on the water surface, and a floating crane assembly 31 and a counterweight device 33 provided on the floating base 32, the floating crane assembly 31 includes a floating crane truss 311 and a hook 312, the floating crane assembly 31 is used for hoisting the steel girder box 6 onto the girder rail 1 and can rotate relative to the floating base 32, so that the floating crane assembly 31 can lift the steel girder box 6 and rotate to the upper side of the girder transporting track 1 to place the steel girder box 6 on the girder transporting vehicle 21 on the girder transporting track 1, so that the hoist 22 pulls the girder transporting vehicle 21 to move along the girder rail 1 to the first pier 52, so that the girder construction 4 above the first pier 52 lifts the steel girder box 6 and is placed on the girder storage platform 71 between the 0# pier and the 1# pier across the top of the 1# pier, then, the stored steel girder boxes 6 are sequentially erected to complete erection of the steel girder boxes 6 from the 0# pier to the 1# pier. Further, a bracket 7 is provided on the left side of the 1# pier, a girder storage platform 71 is provided above the bracket 7 and the first pier 52, and the girder storage platform 71 spans between the 0# pier and the 1# pier.

Referring to fig. 1, eight steel girder boxes 6, i.e., the steel girder boxes 6 numbered from O to V as shown in fig. 1, are required between the 0# pier and the 1# pier, and thus the above process may be repeated eight times to hoist and store the eight steel girder boxes so as to erect the steel girder boxes 6 between the 0# pier and the 1# pier, and the erected steel girder boxes may be fixed by stay cables 9.

As shown in fig. 9, the present disclosure also provides a method for transporting beam frames, comprising the steps of:

s101: laying a beam transporting track on a slope surface on the bank side of the water surface; the girder transporting track extends to a first pier arranged on the shore side along the extending direction of the shore side;

s102: conveying the steel box girder to a girder conveying track through a floating crane mechanism;

s103: the method comprises the following steps that a steel beam box on a beam conveying track is drawn to a preset hoisting position through a drawing mechanism;

s104: hoisting and assembling the steel beam box pulled to the preset hoisting position through a beam hoisting mechanism;

s105: and welding and fixing the assembled steel beam box through the stay cable to complete erection.

Specifically, for the construction of the girder transporting track, in order to reduce the amount of work, the gradient of the girder transporting track is set according to the gradient of the water level rising and falling area of the water surface (i.e., the gradient of the bank side) on the premise that the minimum thickness of the foundation concrete of the girder transporting track is not less than 2 m. After the water level is receded, the elevation of the river beach on the bank side is measured firstly, a reasonable comprehensive gradient is selected by adopting the principle of low burying height digging, and the gradient change points are not too much. After the foundation of the beam conveying track is excavated, the bearing capacity of the foundation is actually measured on site, and the minimum bearing capacity is not lower than 150 Kpa. If the bearing capacity is too small, the construction can be carried out by replacing and filling, squeezing or driving the pine piles. Before the beam transporting track is poured, the elevation of the vertical mold is fixed after being qualified through strategic lofting detection, the track steel plate is pre-embedded through wire drawing according to the lofting elevation, a track fixing pre-embedded plate is pre-embedded in foundations of two sides of a side slope point and different slopes, and the end part of the disconnected track is fixed. Before the beam conveying track is installed, the central lines of the track are paid out at intervals of 5m in the same cross section by measurement lofting, and encryption lofting is carried out on the cross section of a variable slope point. When the beam transporting tracks are installed, the smoothness and the straightness of a single track are ensured, the distance deviation between every two of the four tracks is not more than 5mm, and the elevation difference is less than 3 mm.

Further, before the step of laying the girder transporting rail on the shore side, the girder transporting method further includes: and a support is arranged on one side of the pier far away from the water surface, and a beam storage platform is erected between the support and the pier and used for storing the steel box beam lifted by the beam lifting mechanism.

Further, the step of hoisting the steel girder box at the preset hoisting position to the position above the pier through the hoisting beam mechanism and erecting comprises: sequentially hoisting a plurality of steel beam boxes to a beam storage platform above the bridge piers; and hoisting the steel beam box through the beam hoisting mechanism and moving the steel beam box to a preset erection position along the beam storage platform for erection respectively.

Further, after the step of erecting the steel girder box transported to the preset hoisting position by hoisting the girder hoisting mechanism, the method of transporting the girder frame further comprises: and connecting the steel beam box with other erected steel beam boxes adjacent to the steel beam box.

Further, after the step of connecting the girder box and other erected girder boxes adjacent to the girder box, the method of transporting the girder frame further includes: and fixing the steel beam box through a stay cable.

As shown in fig. 3 to 7, 9 steel girder boxes, i.e., the steel girder boxes numbered D to N as shown in fig. 1, need to be erected between the pier # 1 (i.e., the first pier 52 in the above embodiment) and the pier # 2. The specific whole steel beam box (numbered H-numbered V, 15 steel beam boxes in total) erection process is as follows:

the first process is as follows: as shown in fig. 3 and 4, the girder transportation tracks and the supports on the left sides of the 1# piers are erected, then the girder transportation vehicles with the numbers of I-L are hoisted to the girder transportation vehicles by the floating crane mechanism, the girder transportation vehicles are transported to the right below the girder hoisting mechanism of the bridge floor under the traction of the traction mechanism, the girder hoisting mechanism hoists the girder girders slowly, and then the girder transportation vehicles are sequentially erected and connected together and fixed by stay cables.

And a second process: as shown in fig. 5, the steel girder boxes numbered V-numbered O are sequentially hoisted to the girder transporting vehicle by the floating crane, the girder transporting vehicle is transported to the top of the girder transporting track, i.e. the 1# pier under the traction of the traction mechanism, and at this time, the steel girder boxes numbered V-numbered O are sequentially hoisted to the top of the 1# pier by the hoisting mechanism on the bridge floor, and are erected after being moved to the proper position on the support.

And a third process: as shown in fig. 6, the girder hanging mechanism on the deck hoists the steel girder box numbered N to the top of the pier # 1 and performs pre-deflection.

And (4) a fourth process: as shown in fig. 7, the girder hanging mechanism has a luffing mechanism, and can hang the steel girder box numbered M for erection and then pull the steel girder box numbered N for closure construction.

And a fifth process: as shown in fig. 7, the beam hanging mechanism of the deck performs subsequent installation construction and performs closure construction.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.