Bridge erection method

Abstract

The application provides a bridge erection construction method, and belongs to the technical field of bridge construction, which comprises the following steps: installing a main pier and an auxiliary pier, transporting a temporary support on the two auxiliary piers by using a floating box device, installing a lifting turner on the temporary support; using two floating box devices to form a combined floating box, and arranging an extension mechanism between the two floating box devices; installing a lifting turner on each of the two floating box devices; installing a steel beam on the lifting turner of one floating box device, starting the extension mechanism to control the movement of the other floating box device to the other side of the temporary support; starting the lifting turner to control the steel beam to rotate by 90 degrees and support on the two lifting turners; and starting the lifting turner on the temporary support to drive the steel beam to rotate by 90 degrees and support on the main pier. The bridge erection construction method provided by the application can be operated without using the dragging method to cooperate with the floating method, the installation efficiency is improved, and the construction cost is not increased.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology, and more specifically, relates to a bridge erection construction method. Background Technology

[0002] Steel bridges are widely constructed due to their high rigidity, short construction period, and ease of repair. When erecting steel bridges in water, the "floating cloud method" is often used to transport components by leveraging the buoyancy of the water. However, after installing temporary supports on the piers, the interference of these supports makes it impossible to continue using the floating cloud method. In such cases, alternative methods must be used, affecting the normal progress of the entire bridge erection and reducing installation efficiency. This situation also increases the amount of equipment required for bridge erection, occupies more space, and increases construction costs. Summary of the Invention

[0003] The purpose of this invention is to provide a bridge erection method to solve the technical problems in the prior art where the floating method cannot be used continuously, resulting in low steel bridge installation efficiency and increased construction costs.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a bridge erection construction method, comprising:

[0005] S1: Install two sets of main piers at the location where the bridge is to be erected, with the two sets of main piers spaced apart and facing each other; install two sets of auxiliary piers at the location where the bridge is to be erected, with the two sets of auxiliary piers located between the two sets of main piers and respectively close to the two sets of main piers.

[0006] S2: Assemble temporary supports on the pontoon device and transport the temporary supports between the two sets of main piers and above the auxiliary piers; adjust the height of the pontoon device so that the temporary supports fall on the two sets of auxiliary piers; control the pontoon device to detach from the temporary supports and remove it, and install a lifting and rotating device on the temporary supports.

[0007] S3: Two pontoon devices are docked to form a combined pontoon, and a telescopic mechanism is provided between the two pontoon devices; a lifting and rotating device is installed on both pontoon devices;

[0008] S4: Install the steel beam on the lifting rotator on a floating box device, move the steel beam to one side of the temporary support, and make the steel beam higher than the temporary support. Start the telescopic mechanism to control another floating box device to pass under the temporary support to the other side of the temporary support.

[0009] S5: Start the lifting rotator under the steel beam to control the steel beam to rotate 90 degrees, so that the steel beam is supported on the lifting rotator of the two floating box devices; start the two lifting rotators to move downwards, so that the steel beam is supported on the lifting rotator of the temporary support.

[0010] S6: control two floating device away, start the temporary support on the lifting rotary drive steel beam to rotate ninety degrees to the steel beam is located in the temporary support directly above, and drive the steel beam to move down to the two ends of the steel beam is supported on two groups of main piers; using the floating device to transport the temporary support away.

[0011] In a possible implementation, the two floating devices of the combined floating device are each provided with a recess on the side close to each other, and the two ends of the telescopic mechanism are respectively installed in the two recesses; an elastic telescopic sleeve for surrounding and sealing the telescopic mechanism is further provided between the two floating devices.

[0012] In a possible implementation, the floating device is of a symmetrical structure, and the floating device is lowered or raised by injecting water into the floating device or draining water from the floating device through a water pump; when water is injected into the floating device, water is first injected into the floating devices at both ends, and then sequentially injected into the floating devices inside from both ends; when water is drained from the floating device, water is first drained from the floating devices inside, and then sequentially drained from the floating devices at both ends.

[0013] In a possible implementation, the lifting rotary drive includes a rotating platform and a jacking device, the jacking device is fixedly installed on the floating device, and the free end extends upward, and the rotating platform is installed on the jacking device; the steel beam is supported on the rotating platform.

[0014] In a possible implementation, the upper end surface of the rotating platform is provided with two limiting protrusions, and the steel beam is installed between the two limiting protrusions.

[0015] In a possible implementation, the rotating platform is further provided with two auxiliary support assemblies and two driving assemblies, the auxiliary support assemblies are rotationally connected to the side surface of the rotating platform, the driving assemblies are connected with the auxiliary support assemblies, are used for driving the auxiliary support assemblies to rotate, and one end of the auxiliary support assemblies away from the rotating platform is supported on the steel beam; the two auxiliary support assemblies are symmetrically arranged and are respectively arranged on the side surface adjacent to the two limiting protrusions on the rotating platform.

[0016] In a possible implementation, the auxiliary support assembly includes a rotating shaft, a plurality of support rods, and a plurality of supporting plates, the rotating shaft is rotationally connected to the side surface of the rotating platform, a plurality of the support rods are parallel and spaced apart, and one end of each of the support rods is fixedly connected to the outer side surface of the rotating shaft and extends away from the rotating platform; a plurality of the supporting plates correspond to a plurality of the support rods one by one, and the supporting plate is fixedly installed on the other end of the corresponding support rod, and the supporting plate is used for abutting against the lower end of the steel beam.

[0017] In a possible implementation, the two floating device of the combined floating box are provided with lifting sliders, the two lifting sliders and two lifting rotators are located on the same line and are perpendicular to the length direction of the temporary support; in S5, after the lifting rotator under the steel beam is started to control the steel beam to rotate 90 degrees, the two lifting sliders are started to lift the steel beam, and the steel beam is driven to move to the position where the center of the steel beam is aligned with the lifting rotator on the temporary support.

[0018] In a possible implementation, the lifting slider comprises a linear driver, a long supporting plate, two sliding rails and two sliding vehicles, the linear driver is fixedly installed on the floating device and extends upward at the free end, the long supporting plate is installed on the free end of the linear driver; the two sliding rails are arranged in parallel and are fixedly installed on the long supporting plate, and the length direction of the sliding rail is consistent with the length direction of the long supporting plate, and the two sliding vehicles are respectively and correspondingly installed on the two sliding rails.

[0019] In a possible implementation, the upper ends of the two groups of main bridge piers are provided with lifting mechanisms, the two ends of the steel beam are supported on the lifting mechanisms, and then permanent supports are arranged on the two groups of main bridge piers; the lifting mechanisms are started to drive the steel beam to move downward and be supported on the permanent supports.

[0020] The bridge erection construction method has the beneficial effects that, compared with the prior art, the bridge erection construction method is used, the main bridge pier and the auxiliary bridge pier are first installed, the temporary support is transported to the position between the two main bridge piers and above the two auxiliary bridge piers in water by using the floating box device, the two ends of the temporary support are respectively dropped on the two auxiliary bridge piers by sinking the floating box device in water, then the two floating box devices are butted to form a combined floating box, the steel beam is installed on the lifting rotator of one floating box device, and the combined floating box is controlled to move towards the temporary support, the other floating box device is located below the temporary support, and the telescopic mechanism passes through the two auxiliary bridge piers to the other side of the temporary support, at this time, the two floating box devices in the combined floating box are located on the two sides of the temporary support, the lifting rotator is started to drive the steel beam to rotate by 90 degrees, and the steel beam is supported on the two lifting rotators of the two floating box devices, the two lifting rotators are controlled to descend to the lifting rotator on which the steel beam is supported on the temporary support, then the lifting rotator on the temporary support is started to drive the steel beam to rotate by 90 degrees again to be located directly above the temporary support, the length direction of the steel beam is parallel to the length direction of the temporary support, and the lifting rotator on the temporary support is started to descend to support the steel beam on the two main bridge piers, finally, the temporary support is transported away by using the floating box device, and the bridge erection construction operation is completed. In this way, the two floating box devices are butted to form the combined floating box, the two lifting rotators are installed, and the lifting rotator on the temporary support is installed to control the steel beam to rotate by 90 degrees in sequence, so that the steel beam overcomes the obstacles and blockages in the steel beam erection, the floating transportation method is continuously used throughout the steel beam erection construction operation, the operation of the pulling method is not required, the installation efficiency is improved, and the construction cost is not increased. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative labor.

[0022] Figure 1 The structural schematic diagram of the combined floating box provided by the embodiments of the present application;

[0023] Figure 2 The construction schematic diagram of the bridge erection construction method provided by the embodiments of the present application Figure One ;

[0024] Figure 3 The construction schematic diagram of the bridge erection construction method provided by the embodiments of the present application Figure Two ;

[0025] Figure 4 The construction schematic of the bridge erection construction method provided by the embodiment of the present application Figure Three ;

[0026] Figure 5 The connection schematic of the lifting rotator and the auxiliary support assembly provided by the embodiment of the present application.

[0027] In the drawings, various reference signs refer to the following items:

[0028] 10, pontoon device; 11, lifting rotator; 12, steel beam; 13, elastic telescopic sleeve; 14, lifting skid; 15, auxiliary support assembly; 16, rotating shaft; 17, support rod; 18, supporting plate; 19, temporary support. DETAILED DESCRIPTION

[0029] In order to make the technical problems to be solved by the present application, the technical solutions and beneficial effects clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0030] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0031] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0033] Please refer to Figures 1 to 4 The bridge erection construction method provided by the present application will now be described. A bridge erection construction method, comprising:

[0034] S1: install two groups of main piers at the position of the bridge to be erected, and the two groups of main piers are oppositely arranged; install two groups of auxiliary piers at the position of the bridge to be erected, and the two groups of auxiliary piers are located between the two groups of main piers and are arranged close to the two groups of main piers respectively;

[0035] S2: assemble the temporary support 19 on the floating box device 10, and transport the temporary support 19 to the position between the two groups of main piers and above the auxiliary piers; adjust the height of the floating box device 10 so that the temporary support 19 falls on the two groups of auxiliary piers; control the floating box device 10 to be separated from the temporary support 19 and move away, and install the lifting rotator 11 on the temporary support 19;

[0036] S3: use two floating box devices 10 to butt joint to form a combined floating box, and a telescopic mechanism is arranged between the two floating box devices 10; install the lifting rotator 11 on each of the two floating box devices 10;

[0037] S4: install the steel beam 12 on the lifting rotator 11 of one floating box device 10, and move the steel beam 12 to one side of the temporary support 19, and the steel beam 12 is higher than the temporary support 19, and start the telescopic mechanism to control the other floating box device 10 to pass from below the temporary support 19 to the other side of the temporary support 19;

[0038] S5: start the lifting rotator 11 below the steel beam 12 to control the steel beam 12 to rotate by ninety degrees, so that the steel beam 12 is supported on the lifting rotators 11 of the two floating box devices 10; start the two lifting rotators 11 to move downward, so that the steel beam 12 is supported on the lifting rotators 11 of the temporary support 19;

[0039] S6: control the two floating box devices 10 to move away, start the lifting rotator 11 on the temporary support 19 to drive the steel beam 12 to rotate by ninety degrees to the position directly above the temporary support 19, and drive the steel beam 12 to move downward to be supported on the two groups of main piers at the two ends of the steel beam 12 respectively; use the floating box device 10 to transport the temporary support 19 away.

[0040] The bridge erection construction method has the advantages that compared with the prior art, when in use, the main piers and the auxiliary piers are installed first, the temporary support 19 is transported between the two main piers and above the two auxiliary piers by using the floating box device 10 in water, and the two ends of the temporary support 19 are respectively dropped on the two auxiliary piers by sinking the floating box device 10 in water; then the two floating box devices 10 are butt-jointed to form a combined floating box, the steel beam 12 is installed on the lifting rotator 11 of one of the floating box devices 10, and the combined floating box is controlled to move towards the temporary support 19; the other floating box device 10 is located below the temporary support 19, and the telescopic mechanism passes through the two auxiliary piers to the other side of the temporary support 19, at this time, the two floating box devices 10 in the combined floating box are respectively located on the two sides of the temporary support 19; the lifting rotator 11 is started to drive the steel beam 12 to rotate by 90 degrees, and the steel beam 12 is supported on the two lifting rotators 11 of the two floating box devices 10 at the same time, the two lifting rotators 11 are controlled to descend to the lifting rotator 11 on which the steel beam 12 is supported on the temporary support 19; then the lifting rotator 11 on the temporary support 19 is started to drive the steel beam 12 to rotate by 90 degrees again, so that the steel beam 12 is located directly above the temporary support 19, and the length direction of the steel beam 12 is parallel to the length direction of the temporary support 19, and the lifting rotator 11 on the temporary support 19 is started to descend to support the steel beam 12 on the two main piers; finally, the temporary support 19 is transported away by using the floating box device 10, and the bridge erection construction operation is completed. In this way, the two floating box devices 10 are butt-jointed to form a combined floating box, two lifting rotators 11 are installed, and the lifting rotator 11 installed on the temporary support 19 is used to control the steel beam 12 to rotate by 90 degrees successively, so that the steel beam 12 overcomes the obstacles and blockages of the temporary support 19 for the erection of the steel beam 12, the floating transportation method is continuously used throughout the steel beam 12 erection construction operation, and the pulling method is not used to cooperate with the floating transportation method, the installation efficiency is improved, and the construction cost is not increased.

[0041] Please refer to Figure 1As a specific embodiment of the bridge erection construction method provided by the present application, the two floating box devices 10 in the combined floating box are provided with recesses on the sides close to each other, and the two ends of the telescopic mechanism are respectively installed in the two recesses; an elastic telescopic sleeve 13 for surrounding and sealing the telescopic mechanism is further arranged between the two floating box devices 10; the telescopic mechanism is accommodated in the recesses, so that the fixed end and the free end of the telescopic mechanism are respectively connected in the two recesses; when the two floating box devices 10 are docked, the two floating box devices 10 are completely spliced together by means of the two recesses, and then can be stably and safely moved in water. After the combined box body transports the steel beam 12 to one side of the temporary support 19, the telescopic mechanism is started to separate the two floating box devices 10, and the two floating box devices 10 are respectively located on the two sides of the temporary support 19; the elastic telescopic sleeve 13 wrapped outside the telescopic mechanism enables the telescopic mechanism to work stably and efficiently in the water environment.

[0042] Please refer to Figures 1 to 4 As a specific embodiment of the bridge erection construction method provided by the present application, the floating box device 10 is of symmetrical structure, and the floating box device 10 is lowered or raised by injecting water into the floating box or draining water from the floating box through a water pump; when water is injected, water is first injected into the floating boxes at both ends, and then water is sequentially injected into the floating boxes inside from both ends; when water is drained, water is first drained from the floating boxes inside, and then water is sequentially drained from the floating boxes outside from the inside; the floating box device 10 is provided with an even number of columns of floating boxes, and the floating boxes are symmetrically arranged, and the two columns of floating boxes opposite to each other form a group; when water is injected, water is first injected into the two columns of floating boxes at both ends, and then water is sequentially injected into the floating boxes inside from the outside of each group, until all the floating boxes are injected with water, so as to realize the lowering of the steel beam 12; when water is drained, water is first drained from the two columns of floating boxes inside the same group, and then water is sequentially drained from the floating boxes outside from the inside of each group, so as to realize the raising of the steel beam 12; by this way of injecting and draining water, the balance of the whole floating box device 10 is higher.

[0043] Please refer to Figures 1 to 5 As a specific embodiment of the bridge erection construction method provided by the present application, the lifting and rotating device 11 includes a rotating platform and a jacking device, the jacking device is fixedly installed on the floating box device 10 and extends upward at the free end, and the rotating platform is installed on the jacking device; the steel beam 12 is supported on the rotating platform; the jacking device is first installed on the floating box device 10, the rotating platform is fixedly connected to the free end of the jacking device, and the steel beam 12 is directly placed on the rotating platform when the steel beam 12 is installed. The number of lifting devices is three or four, and a bearing plate is fixedly installed on the free ends of the plurality of lifting devices, so that the rotating platform can be more stable. The rotating platform is used to control the rotation of the steel beam 12, and the lifting device is used to control the lifting or lowering of the steel beam 12. The lifting device can be an oil cylinder.

[0044] Please refer to Figure 1As one specific embodiment of the bridge erection construction method provided by the present application, the upper end face of the rotating platform is provided with two limiting protruding portions, and the steel beam 12 is installed between the two limiting protruding portions; that is, after the steel beam 12 is installed on the rotating platform, the steel beam 12 is installed between the two limiting protruding portions; under the action of the two limiting protruding portions, the installation effect of the steel beam 12 is more reliable.

[0045] Please refer to Figure 1 and Figure 5 As one specific embodiment of the bridge erection construction method provided by the present application, the rotating platform is further provided with two auxiliary support assemblies 15 and two driving assemblies, the auxiliary support assemblies 15 are rotationally connected to the side face of the rotating platform, the driving assemblies are connected with the auxiliary support assemblies 15, and are used to drive the auxiliary support assemblies 15 to rotate and support the one end of the auxiliary support assemblies 15 away from the rotating platform on the steel beam 12; the two auxiliary support assemblies 15 are symmetrically arranged and respectively arranged on the side face of the rotating platform adjacent to the two limiting protruding portions; after the steel beam 12 is installed on the rotating platform, the two driving assemblies are started to respectively control the two auxiliary support assemblies 15 to rotate upward, so that the auxiliary support assemblies 15 are supported on the lower end face of the steel beam 12, so as to improve the installation stability of the steel beam 12. At the same time, the driving assemblies and the auxiliary support assemblies 15 are both two, so that the two auxiliary support assemblies 15 are respectively supported on the positions of the steel beam 12 located on both sides of the rotating platform under the action of the corresponding driving assemblies.

[0046] Please refer to Figure 5As a specific embodiment of the bridge erection construction method provided by the present application, the auxiliary support assembly 15 comprises a rotating shaft 16, a plurality of support rods 17 and a plurality of supporting plates 18. The rotating shaft 16 is rotatably connected to the side surface of the rotating platform. The plurality of support rods 17 are arranged in parallel and at intervals, and one end of each of the support rods 17 is fixedly connected to the outer side surface of the rotating shaft 16 and extends away from the rotating platform. The plurality of supporting plates 18 correspond to the plurality of support rods 17 one by one, and the supporting plate 18 is fixedly installed at the other end of the corresponding support rod 17 and is used to abut against the lower end of the steel beam 12. Two lug plates are arranged on the two side surfaces of the rotating platform, and bearings are installed on the lug plates. The rotating shaft 16 is installed on the two bearings, and a plurality of support rods 17 arranged side by side are installed on the outer side surface of the rotating shaft 16. One end of each of the support rods 17 is fixedly connected to the rotating shaft 16, and the other end extends away from the rotating platform. The supporting plate 18 is fixedly installed at the other end of the support rod 17. Therefore, after the plurality of support rods 17 are lifted by the rotation of the rotating shaft 16, the plurality of supporting plates 18 simultaneously support the lower end surface of the steel beam 12. In this way, the steel beam 12 can be supported by the plurality of supporting plates 18, and the auxiliary support assembly 15 is divided into the plurality of support rods 17 and the plurality of supporting plates 18. Even if some of the support rods 17 or the supporting plates 18 are damaged, the steel beam 12 can still be stably supported. The driving assembly comprises a driving motor and a gear transmission.

[0047] Please refer to Figures 1 to 4 As a specific embodiment of the bridge erection construction method provided by the present application, the two floating box devices 10 in the combined floating box are each provided with a lifting sliding device 14. The two lifting sliding devices 14 and the two lifting rotators 11 are located on the same straight line and are perpendicular to the length direction of the temporary support 19. In S5, after the lifting rotator 11 under the steel beam 12 is started to control the steel beam 12 to rotate by 90 degrees, the two lifting sliding devices are started to lift the steel beam 12, and the steel beam 12 is driven to move to the position where the center of the steel beam 12 is aligned with the lifting rotator 11 on the temporary support 19. The lifting sliding device 14 is arranged on each of the two floating box devices 10, and the two lifting sliding devices 14 are located on the inner side of the two lifting rotators 11. After the steel beam 12 is rotated and supported on the two lifting rotators 11, the two lifting sliding devices 14 are started to lift the steel beam 12 and control the steel beam 12 to slide along the length direction of the steel beam 12, so that the center of the steel beam 12 is aligned with the center of the lifting rotator 11 on the temporary support 19. The lifting sliding device 14 is started again to control the steel beam 12 to move downward and fall on the lifting rotator 11 of the temporary support 19. Finally, the lifting rotator 11 is started to make the steel beam 12 rotate by 90 degrees again and stably fall on the two main piers.

[0048] Please refer to Figures 1 to 4As a specific embodiment of the bridge erection construction method provided by the present application, the lifting and sliding device 14 comprises a linear actuator, a long support plate, two sliding rails and two sliding vehicles. The linear actuator is fixedly installed on the floating box device 10 and extends upward at a free end. The long support plate is installed on the free end of the linear actuator. The two sliding rails are arranged in parallel and at intervals and are fixedly installed on the long support plate. The length direction of the sliding rails is consistent with the length direction of the long support plate. The two sliding vehicles are respectively and correspondingly installed on the two sliding rails. The linear actuator, the long support plate, the sliding rails and the sliding vehicles are sequentially arranged from bottom to top, and the linear actuator is used to control the lifting or lowering of the steel beam 12. After the steel beam 12 is supported on the two sliding vehicles, the four sliding vehicles are simultaneously started to drive the steel beam 12 to move. The sliding rails are installed on the long support plate, and the length direction of the sliding rails is consistent with the direction of the vehicle support plate, so that the sliding vehicles have sufficient sliding distance to adjust the position of the steel beam 12. The linear actuator can be an oil cylinder.

[0049] As a specific embodiment of the bridge erection construction method provided by the present application, the upper ends of the two groups of main piers are provided with jacking mechanisms, the two ends of the steel beam 12 are supported on the jacking mechanisms, and then the permanent supports are arranged on the two groups of main piers. The jacking mechanisms are started to drive the steel beam 12 to move downward and be supported on the permanent supports. When the steel beam 12 is supported on the two main piers, the two ends of the bridge are pre-supported on the two jacking mechanisms, so that the steel beam 12 has an installation interval with the main piers. The workers install and arrange the permanent supports in the installation interval, and the jacking mechanisms are started to control the steel beam 12 to be lowered and installed on the permanent supports on the two sides, so as to ensure the safety and stability of the steel beam 12 in use. The jacking mechanism can be a hydraulic jack.

[0050] The above is only a preferred embodiment of the present application and is not used to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A bridge erecting construction method characterized by comprising: The method comprises the following steps: S1: installing two groups of main piers at the position of the bridge to be erected, and the two groups of main piers are oppositely arranged; installing two groups of auxiliary piers at the position of the bridge to be erected, and the two groups of auxiliary piers are located between the two groups of main piers and are arranged close to the two groups of main piers respectively; S2: assembling a temporary support on the floating box device, and transporting the temporary support to the position between the two groups of main piers and above the auxiliary piers; adjusting the height of the floating box device so that the temporary support falls on the two groups of auxiliary piers; controlling the floating box device to be separated from the temporary support and to be removed, and installing a lifting and rotating device on the temporary support; S3: using two floating box devices to form a combined floating box, and a telescopic mechanism is arranged between the two floating box devices; installing a lifting and rotating device on each of the two floating box devices; S4: installing a steel beam on the lifting and rotating device of one floating box device, and moving the steel beam to one side of the temporary support, and the steel beam is higher than the temporary support; starting the telescopic mechanism to control the other floating box device to pass under the temporary support to the other side of the temporary support; S5: starting the lifting and rotating device under the steel beam to control the steel beam to rotate by 90 degrees, so that the steel beam is supported on the lifting and rotating devices of the two floating box devices; starting the two lifting and rotating devices to move downward, so that the steel beam is supported on the lifting and rotating devices of the temporary support; S6: controlling the two floating box devices to be removed, starting the lifting and rotating device on the temporary support to drive the steel beam to rotate by 90 degrees to the position directly above the temporary support, and driving the steel beam to move downward to be supported on the two groups of main piers at the two ends of the steel beam respectively; using the floating box device to transport the temporary support away; The two floating box devices in the combined floating box are each provided with a lifting and sliding device, the two lifting and sliding devices and the two lifting and rotating devices are located on the same straight line and are perpendicular to the length direction of the temporary support; in S5, after starting the lifting and rotating device under the steel beam to control the steel beam to rotate by 90 degrees, starting the two lifting and sliding devices to lift the steel beam, and driving the steel beam to move to the position where the center of the steel beam is aligned with the lifting and rotating devices on the temporary support.

2. The bridge erecting method according to claim 1, characterized by The two floating box devices in the combined floating box are each provided with a recess on the side close to each other, and the two ends of the telescopic mechanism are respectively installed in the two recesses; an elastic telescopic sleeve for surrounding and sealing the telescopic mechanism is further arranged between the two floating box devices.

3. The bridge erecting method according to claim 2, characterized by The floating box device is of a symmetrical structure, and the floating box device is lowered or raised by injecting water into the floating box or draining water from the floating box through a water pump; when water is injected into the floating box, water is first injected into the floating boxes at the two ends, and then water is sequentially injected into the floating boxes inside from the two ends; when water is drained from the floating box, water is first drained from the floating boxes inside, and then water is sequentially drained from the floating boxes at the two ends from the inside.

4. The bridge erecting method as recited in claim 1, wherein The lifting and rotating device comprises a rotating platform and a jacking device, the jacking device is fixedly installed on the floating box device and extends upward at a free end, and the rotating platform is installed on the jacking device; the steel beam is supported on the rotating platform.

5. The bridge erecting method according to claim 4, wherein The upper end surface of the rotating platform is provided with two limiting protrusions, and the steel beam is installed between the two limiting protrusions.

6. The bridge erecting method as set forth in claim 5, characterized by Two auxiliary support assemblies are rotationally connected to the side surface of the rotating platform, and two driving assemblies are connected with the auxiliary support assemblies for driving the rotation of the auxiliary support assemblies and supporting one end of the auxiliary support assemblies away from the rotating platform on the steel beam. The two auxiliary support assemblies are symmetrically arranged and respectively arranged on the side surface adjacent to the two limiting protruding parts on the rotating platform.

7. The bridge erecting method according to claim 6, wherein The auxiliary support assembly comprises a rotating shaft, a plurality of support rods and a plurality of supporting plates. The rotating shaft is rotationally connected to the side surface of the rotating platform. The plurality of support rods are parallel and spaced apart, and one end of each support rod is fixedly connected to the outer side surface of the rotating shaft and extends away from the rotating platform. The plurality of supporting plates correspond to the plurality of support rods one by one. The supporting plate is fixedly installed on the other end of the corresponding support rod. The supporting plate is used to abut against the lower end of the steel beam.

8. The bridge erecting method as set forth in claim 1, wherein The lifting slider comprises a linear driver, a long strip support plate, two slide rails and two sliding vehicles. The linear driver is fixedly installed on the floating box device, and the free end extends upward. The long strip support plate is installed on the free end of the linear driver. The two slide rails are parallel and spaced apart, and are fixedly installed on the long strip support plate. The length direction of the slide rail is consistent with the length direction of the long strip support plate. The two sliding vehicles are respectively and correspondingly installed on the two slide rails.

9. The bridge erecting method as set forth in claim 1, wherein The upper end of the two groups of main bridge piers is provided with a jacking mechanism. The two ends of the steel beam are supported on the jacking mechanism, and then permanent supports are arranged on the two groups of main bridge piers. The jacking mechanism is started to drive the steel beam to move downward and be supported on the permanent supports.

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