Multi-component non-landing construction bridging system and method suitable for three-dimensional overlapped elevated frame

Abstract

The multi-component non-landing construction bridging system comprises at least two main beams, the main beams are supported at the tops of box beams, cover beams or pier bodies through legs, supporting cross beams are arranged between the legs and the pier bodies, and the supporting cross beams stretch across the tops of the multiple pier bodies; at least one crown block is arranged at the top of the main beam, and the crown block is provided with a hoisting trolley capable of moving transversely and used for hoisting and installing a cover beam and a box beam. The bent cap is divided into two pieces in the longitudinal direction, the two pieces of bent cap are hoisted respectively, and the two pieces of bent cap are fixedly connected with each other when located at the top of the pier body. By the adoption of the structure, under the constraint that the legs do not fall to the ground, hoisting construction of the bent cap and the small box girder can be completed, and the device is suitable for the construction working conditions of three-dimensional overlapped elevated frames and spanning existing roads. And through optimization of the construction process, hoisting construction of the cover beam and the small box beam can be achieved within the range of the main beam only exceeding the length of two spans. By means of the scheme that the bent cap is installed in a split mode, the weight of the bent cap of the large-width bridge is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the field of bridge construction equipment, in particular to a multi-component non-grounded construction bridge erection system and method applicable to a three-dimensional superimposed elevated bridge. Background Art

[0002] When a bridge crosses an existing road, it is often necessary to set up portal piers. Traditional portal piers are mainly cast-in-place prestressed reinforced concrete portal piers. However, due to the possible influence of the existing road under the bridge by the pier drop position, water and electricity pipelines, communication cables, structures, etc., the construction conditions are limited. Therefore, the rapid construction of the portal pier capping beam is a technical problem in this project. There are many schools and residential areas in towns along a certain project line. The line crosses ecological sensitive areas such as rivers, wetland parks, and greenway corridors. The above-ground and underground pipelines are intricate, and the land resources on both sides are very limited. The length of the high-speed co-segment of the newly built bridge is expected to reach 3.5 kilometers, and the overlapping rate of the carriageway projection is 100%. The newly built bridge crosses an existing high-speed for about 500 meters, and some sections also have large-section fully enclosed steel truss sound barriers. The construction difficulty and the complexity of traffic organization rank first among similar projects in the country. At present, there is no similar project for reference, which belongs to the three-dimensional composite reconstruction and expansion of expressways in busy sections and heavy-traffic urban areas. The construction difficulty is extremely high. Chinese Patent Document CN116427281A records a construction method for installing a pier column, capping beam, and T-beam integrated bridge erection machine, which records a scheme for installing a pier column, capping beam, and T-beam using a bridge erection machine. However, at least one leg of this bridge erection machine lands on the ground. In this project, due to the influence of the existing road under the three-dimensional superimposed elevated bridge, the bridge erection machine does not have the construction condition of leg landing. CN110093862A records a three-working-face bridge erection machine that can realize longitudinal and transverse assembly and a construction method for segmental assembly of a capping beam without a temporary access road, and there is also this technical problem. The scheme adopted in this document is to place the front leg on the bearing platform at the bottom of the pier column, which increases the projected area of the bearing platform. Moreover, due to the influence of the superimposed elevated bridge, the leg height is relatively high. Therefore, a leg with a larger cross-section needs to be used, which increases the self-weight. This document adopts a prestressed segmental capping beam structure with transverse splicing, which has a large construction difficulty and weak structural stability. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a multi-component non-grounded construction bridge erection system and method applicable to a three-dimensional superimposed elevated bridge, which can carry out bridge erection construction without occupying the road, and the legs of the bridge erection machine do not need to be supported on the ground, reducing the support risk of high legs. The bridge erection system of the present invention can complete the conveying work of components from the bridge deck, greatly reducing the occupation of the existing road. In a preferred solution, the structure and operation difficulty of the bridge erection system can be simplified, especially the difficulty of switching legs during the conveying process of the capping beam can be reduced.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is: a multi-component non-grounded construction bridge system applicable to a three-dimensional superimposed elevated structure, including at least two main beams, the main beams are supported on the top of a box girder, a capping beam or a pier body by legs, a support cross beam is provided between the legs and the pier body, and the support cross beam spans across the tops of multiple pier bodies; At least one overhead crane is provided on the top of the main beam, and the overhead crane is provided with a lifting trolley that can move horizontally, for lifting and installing the capping beam and the box girder.

[0005] In a preferred solution, the capping beam is longitudinally divided into two pieces, and the two pieces of capping beams are respectively hoisted and fixedly connected to each other when they are on the top of the pier body; The length of the main beam covers a range of more than two spans and less than three spans.

[0006] In a preferred solution, there are two main beams, and a rear leg, a middle leg, a front-middle leg and a front leg are successively provided along the main beams; the rear leg, the middle leg, the front-middle leg and the front leg can move relative to the main beams, and the moving direction is the length direction of the main beams; The rear leg, the front-middle leg and the front leg are provided with lifting hydraulic cylinders and guiding mechanisms to realize the lifting of the legs, so as to facilitate the front-middle leg to be respectively supported on the top of the capping beam or supported on the top of the pier body through the support cross beam; The middle leg, the front-middle leg and the front leg are located on a transverse movement track, and a wheel box is provided at the bottom of the middle leg and the front-middle leg for moving along the transverse movement track. During the movement, the rear leg and the front leg are in a raised state; A first overhead crane and a second overhead crane are provided on the main beam, and a rotating sling is provided below the first overhead crane and the second overhead crane. The rotating sling is used to horizontally rotate the capping beam conveyed along the surface of the box girder by 90° in the air for installation on the top of the pier body.

[0007] In a preferred solution, in the rotating sling, a connecting beam is used to connect with the capping beam. A hinge seat is provided at the middle position of the connecting beam. The hinge seat is hinged to the bottom of the shaft, and the shaft is rotatably connected to the lifting beam. The lifting beam is connected to the first overhead crane and the second overhead crane; The hinge seat is slidably connected to the connecting beam, and an adjusting oil cylinder is provided between the hinge seat and the connecting beam to adjust the balance of the connecting beam.

[0008] In a preferred solution, there are two main beams, and a rear leg, a middle leg, a front-middle leg and a front leg are successively provided along the main beams; the rear leg, the middle leg, the front-middle leg and the front leg can move relative to the main beams, and the moving direction is the length direction of the main beams; The rear leg, the front-middle leg and the front leg are provided with lifting hydraulic cylinders and guiding mechanisms to realize the lifting of the legs, so as to facilitate the front-middle leg to be respectively supported on the top of the capping beam or supported on the top of the pier body through the support cross beam; The middle legs, front middle legs and front legs are placed on the transverse movement tracks. Wheel boxes are provided at the bottoms of the middle legs and front middle legs for moving along the transverse movement tracks. During the movement, the rear legs and front legs are in the raised state. There is also a beam transport trolley for transporting the capping beam. A turntable is provided at the top of the beam transport trolley to achieve a 90° horizontal rotation on the surface of the box girder through the cooperation of the overhead crane.

[0009] In the preferred solution, there are four main girders covering two spans of pier bodies. The four main girders are divided into two groups and arranged in parallel. One overhead crane is provided at the top of each group of main girders. A tail leg, middle leg, front middle leg and front leg are successively arranged along the main girder. The tail leg, middle leg, front middle leg and front leg can move relative to the main girder, and the moving direction is the length direction of the main girder. The tail leg, middle leg, front middle leg and front leg are provided with lifting hydraulic cylinders and guiding mechanisms to realize the lifting of the legs, so that the middle leg can respectively support on the box girder, capping beam or supporting cross beam, or the front leg or front middle leg can respectively support on the capping beam or supporting cross beam. The tail leg and middle leg are placed on the transverse movement tracks. Wheel boxes are provided at the bottoms of the tail leg and middle leg for moving along the transverse movement tracks. There is also a beam transport trolley for transporting the capping beam. A turntable is provided at the top of the beam transport trolley to achieve a 90° horizontal rotation on the surface of the box girder through the cooperation of the overhead crane.

[0010] In the preferred solution, sliding seats that slide along the beam body are provided at the bottom of the beam body of the supporting cross beam. The number of sliding seats is the same as the number of corresponding pier bodies. The top of the sliding seat is connected to the grooves on both sides of the beam body through hanging wheels. There is a gap between the hanging wheels and the grooves. When the beam is lowered, the beam body lands on the top of the sliding seat. A plurality of extension seats are provided at the bottom of the sliding seat. The extension seats avoid the steel bars. A plunger is provided at the bottom of the extension seat. The plunger is movably arranged in a vertical cylinder body. Communication ports are provided between the cylinder bodies of each plunger, and a liquid inlet is provided on one of the cylinder bodies.

[0011] A construction method of the above multi-component non-grounded construction bridge erection system applicable to the three-dimensional superimposed elevated structure includes the following steps: S01. Move the overhead crane to the tail of the main girder, make the main girder advance to the top of the (N + 1)th pier body, retract the front legs and front middle legs, and let the front legs and the supporting cross beam cross over the (N + 1)th pier body and hang in the air. The front middle legs and the supporting cross beam move to the front side of the (N + 1)th pier body for support. Make the main girder advance to the top of the (N + 2)th pier body. S02. Move the front legs and the supporting cross beam to the front side of the (N + 2)th pier body for support, and move the front middle legs to a position close to the front legs and hang in the air. S03. The girder carrier transports the first capping beam along the bridge deck to the position below the rotary sling. The first overhead crane and the second overhead crane lift the first capping beam, horizontally rotate it by 90° above the (N + 1)th pier, and hoist and install the first capping beam on the front side of the top of the (N + 1)th pier. S04. Hoist and install the second capping beam on the rear side of the top of the (N + 1)th pier according to step S03, and connect the second capping beam and the first capping beam into a whole. S05. The girder carrier transports the box girder along the bridge deck to the bridgehead. The first overhead crane and the second overhead crane hoist and install the box girder on the capping beam between the Nth pier and the (N + 1)th pier, and horizontally move the whole main girder to arrange multiple box girders along the transverse direction of the bridge. S06. The middle support leg moves to the front side of the top of the (N + 1)th pier and lands on the second capping beam. S07. The front support leg and the support cross beam cross over the (N + 2)th pier and are suspended. The front middle support leg and the support cross beam move to the front side of the top of the (N + 2)th pier for support. Repeat the above steps to realize the non-ground construction of multiple components of the three-dimensional superimposed viaduct.

[0012] A construction method for the above bridge erection system applicable to the non-ground construction of multiple components of the three-dimensional superimposed viaduct includes the following steps: S11. Move the overhead crane to the tail of the main girder, make the main girder advance to the top of the (N + 1)th pier, retract the front support leg, and move the front support leg and the support cross beam to the front side of the top of the (N + 1)th pier for support. S12. Two girder transport trolleys transport the first capping beam along the bridge deck in a lifting manner to the bridgehead. The middle support leg retracts to a position close to the rear support leg to avoid the rotation range of the first capping beam. The overhead crane is connected to the first lifting point of the first capping beam. The other end of the first capping beam is located on a girder transport trolley. The transverse movement of the main girder is coordinated with the longitudinal movement of the overhead crane and the movement of the girder transport trolley to assist the first capping beam to horizontally rotate by 90° on the bridge deck. The first capping beam first lands on the two girder transport trolleys at the bridgehead position and waits for hoisting. The bridgehead position refers to the end position of the bridge deck after the box girder 17 is laid. S13. Move the middle support leg forward to a position close to the bridgehead and support the main girder, and move the overhead crane to the tail of the main girder. Move the front support leg and the support cross beam forward and suspend them. The front middle support leg and the support cross beam move to the front side of the top of the (N + 1)th pier and support the main girder. The overhead crane hoists the first capping beam to the rear side of the top of the (N + 1)th pier. S14. The middle support leg retracts to a position close to the rear support leg, horizontally rotates the second capping beam by 90° on the bridge deck, and lands on the girder transport trolley at the bridgehead position and waits for hoisting. S15. The middle support leg and the rear support leg move forward to a position close to the bridgehead to support the main girder, and make the main girder advance to the top of the (N + 2)th pier. The front outrigger and supporting beam move to the front side of the top of the N+2 pier, and the front middle outrigger and supporting beam leave the top of the N+1 pier; S16: The overhead crane hoists the second cap beam to the top front side of the N+1 pier body and connects the second cap beam with the first cap beam to form a whole. S17: Two beam transport trolleys transport the box beams along the bridge deck to the bridgehead. The first and second trolleys hoist the box beams onto the cap beam between piers N and N+1. The bridge erection system is moved transversely to lay out multiple box beams in the transverse direction of the bridge. Repeat the above steps to realize the non-ground construction of multiple components of the three-dimensional superimposed elevated structure.

[0013] Preferably, in step S12, the first cap beam is longitudinally transported to the bridge head, the overhead crane moves to the top of the middle of the first cap beam, and is hoisted and connected to the first lifting point near the middle of the first cap beam, and the first lifting point is lifted to make one end of the first cap beam detach from the corresponding beam transport trolley, and the other end of the first cap beam falls on the top of the remaining beam transport trolley, and the beam transport trolley and the overhead crane jointly lift the first cap beam part to the outside of the bridge head. At this time, the beam transport trolley is located at the bridge head, the main beam moves horizontally, and the overhead crane cooperates to move backward to realize the rotation of the first cap beam, and the overhead crane retreats to the bridge head position, and the first cap beam rotated 90° is hoisted back onto the two beam transport trolleys to realize the operation of rotating the first cap beam 90° horizontally on the bridge deck; Preferably, in step S17, the length of the main beam covers the range of two spans plus the first lifting point of the box beam located on the bridge deck, the second car moves to above the first lifting point of the box beam and is connected to the first lifting point, the second car lifts to separate one end of the box beam from a beam transport trolley, the second car and the other beam transport trolley move forward until the second lifting point of the box beam is located below the first car, the first car is connected to the second lifting point of the box beam, and the first car and the second car lift the box beam and install it on the cap beam.

[0014] A construction method for a multi-component, non-ground construction bridge erection system applicable to a three-dimensional composite elevated structure includes the following steps: S21, moving a third overhead crane to the tail of the main beam, advancing the main beam to the top of the N+1 pier, retracting the front legs and the front middle leg, allowing the front legs and the supporting crossbeam to pass over the N+1 pier and remain suspended in the air, and moving the front middle leg to the front side of the top of the N+1 pier; S22: The beam transport trolley transports the first cap beam along the bridge deck to the bridge head. The middle leg moves back to a position close to the tail leg to provide support, avoiding the rotation range of the first cap beam. The two sets of main beams move laterally, and the beam transport trolley cooperates with the third overhead crane to rotate the first cap beam horizontally 90° on the bridge deck. Two beam-transporting trolleys transport the first capping beam to the bridgehead along the bridge deck in a lifting and transporting manner. One of the third trolleys of a group of main girders is connected to the lifting point near the middle of the first capping beam, lifting one end of the first capping beam away from one of the beam-transporting trolleys. The third trolley pulls the first capping beam to move into the air. After avoiding the middle legs, the current group of main girders moves transversely, and the third trolley retreats to rotate the first capping beam, rotating the first capping beam to below the third trolley of the other group of main girders. The current other third trolley is connected to the first capping beam and retreats in cooperation with the transverse movement of the current other group of main girders to continue rotating the first capping beam. At the position on the bridge deck, the two third trolleys place the first capping beam on the beam-transporting trolleys, readjust the lifting points, and complete the 90° horizontal rotation of the first capping beam. S23. The third trolleys on the two groups of main girders hoist and install the first capping beam to the rear side of the top of the N + 1 pier. S24. Horizontally rotate the second capping beam by 90° according to step S22 and place it on the beam-transporting trolley located at the bridgehead position. S25. The middle legs move to a position close to the second capping beam, the main girders move forward to the top of the N + 2 pier, and the front legs and the support cross beam move to the front side of the top of the N + 2 pier. S26. The front and middle legs retract, and the front legs and the support cross beam move to a position close to the N + 2 pier and hang in the air. S27. The third trolleys on the two groups of main girders hoist and install the second capping beam to the front side of the top of the N + 1 pier and connect the first capping beam and the second capping beam into one body. The beam-transporting vehicle transports the box girder to the bridgehead along the bridge deck. The third trolley hoists and installs the box girder on the capping beam between the N pier and the N + 1 pier, and horizontally moves the main girders of each group to arrange multiple box girders along the transverse direction of the bridge. S28. The middle legs move to the bridgehead position at the rear side of the top of the N + 1 pier, the third trolley moves to the tail of the main girder, the front legs and the front and middle legs retract, the front legs and the support cross beam cross over the N + 2 pier and hang in the air, and the front and middle legs move to the front side of the top of the N + 2 pier. Repeat the above steps to realize the non-ground construction of multiple components of the three-dimensional superimposed viaduct with the structure of four main girders.

[0015] In the preferred solution, before the support cross beam lands on the top of the pier, move the position of the sliding seat to make the extension seat avoid the end of the steel bar, and the plunger lands on the top of the pier. Input hydraulic oil into the feed liquid port to make the plunger extend and contact the top of the pier. The pressure of the hydraulic oil is balanced between each cylinder block, and the pressure received by the support cross beam is evenly distributed to each plunger to compensate for the flatness error of the top of the pier.

[0016] The present invention provides a multi-component non-grounded bridge erection system and method applicable to a three-dimensional superimposed elevated bridge. By adopting the above structure, it is possible to achieve the bridge erection construction of multiple components under the constraint condition that the legs do not touch the ground, that is, to complete the hoisting construction of the capping beam and the small box girder, which is suitable for the construction conditions of three-dimensional superimposed elevated bridges and crossing existing roads. By means of the scheme of installing the capping beam in sections, the weight of the capping beam of a large-width bridge is significantly reduced, the single hoisting weight of the bridge erection system is reduced, and thus the self-weight of the bridge erection system is reduced. In some preferred schemes, through the optimization of the leg structure and the construction process, it is possible to achieve the hoisting construction of the capping beam and the small box girder within the range of the main girder with only two spans, so that the bridge erection system has greater flexibility. The provided support cross beam can conveniently provide reliable aerial support for the bridge erection system, and the provided plunger structure for balancing the force can effectively ensure that each plunger is evenly stressed, thus providing reliable support. In some preferred schemes, the construction method using a rotary sling can conveniently realize the aerial rotation of the capping beam. In some preferred schemes, the bridge deck rotation construction method adopted can be applicable to capping beams with a large self-weight, such as bridges with a large span width, so as to reduce the safety risk. Moreover, by adopting the bridge deck rotation construction method, the length of the main girder can be significantly shortened, and only the range covering more than two spans and less than three spans needs to be covered, reducing the volume and cost of the entire bridge erection system and being more flexible during the construction of bridges with a curvature. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the drawings and embodiments: Figure 1 It is the front view of the present invention.

[0018] Figure 2 It is the cross-sectional schematic view of the position of the front legs of the present invention.

[0019] Figure 3 It is the cross-sectional schematic view of the front middle legs of the present invention supported at the position of the support cross beam.

[0020] Figure 4 It is the cross-sectional schematic view of the front middle legs of the present invention supported at the position of the capping beam.

[0021] Figure 5 It is the cross-sectional schematic view of the position of the middle legs of the present invention.

[0022] Figure 6 It is the cross-sectional schematic view of the position of the rear legs of the present invention.

[0023] Figure 7 It is the front view of the present invention when hoisting the capping beam using a rotary sling.

[0024] Figure 8 It is the top view of the present invention when hoisting the capping beam using a rotary sling.

[0025] Figure 9It is a construction schematic diagram when the present invention uses the bridge deck to rotate and hoist the bent cap.

[0026] Figure 10 It is a construction schematic diagram when the present invention uses the bridge deck to rotate and hoist the bent cap.

[0027] Figure 11 It is a construction schematic diagram when the bent cap of the present invention rotates on the bridge deck.

[0028] Figure 12 It is the front view of the support cross beam of the present invention.

[0029] Figure 13 It is the side view of the support cross beam of the present invention.

[0030] Figure 14 It is the structural schematic diagram of the plunger array of the present invention.

[0031] Figure 15 It is the front view when the box girder of the present invention is hoisted.

[0032] Figure 16 It is the cross-sectional schematic diagram of the front leg position of the four-main girder scheme of the present invention.

[0033] Figure 17 It is the cross-sectional schematic diagram of the middle leg position of the four-main girder scheme of the present invention.

[0034] Figure 18 It is the cross-sectional schematic diagram of the tail leg position of the four-main girder scheme of the present invention.

[0035] Figure 19 It is the top view of the four-main girder scheme of the present invention.

[0036] Figure 20 It is the elevation schematic diagram of the bent cap and box girder hoisting of the four-main girder scheme of the present invention.

[0037] Figure 21 It is the top view schematic diagram when the bent cap of the four-main girder scheme of the present invention rotates on the bridge deck.

[0038] In the figure, there are box girders 1, pier shafts 2, rear legs 3, the first overhead crane 4, a lateral traction device 401, a hoisting trolley 402, a pulley block 403, a longitudinal moving device 404, the second overhead crane 5, main girders 6, middle legs 7, transverse moving tracks 8, support crossbeams 9, beam bodies 91, hanging wheels 92, sliding seats 93, extension seats 94, plungers 95, steel bars 96, cylinder blocks 97, liquid inlet ports 98, communication ports 99, front-middle legs 10, front legs 11, connecting rods 12, transverse moving wheel boxes 13, front-middle legs 14, capping beams 15, the first capping beam 151, the second capping beam 152, middle legs 16, box girders 17, rear legs 18, rotating lifting appliances 19, connecting beams 191, position adjusting oil cylinders 192, hinge seats 193, lifting beams 194, beam transporting trolleys 20, front legs 21, the third overhead crane 22, beam transporting vehicles 23, middle legs 24, tail legs 25, and front-middle legs 26. Detailed implementation manners

[0039] Embodiment 1: As Figure 1 、 10 、19 A multi-component non-grounded construction bridge erection system applicable to a three-dimensional superposed elevated structure includes at least two main girders 6. The main girders are supported on the tops of box girders 17, capping beams 15 or pier shafts 2 by legs. A support crossbeam 9 is provided between the legs and the pier shaft 2, and the support crossbeam 9 spans across the tops of multiple pier shafts 2; At least one overhead crane is provided on the top of the main girder 6. The overhead crane is provided with a hoisting trolley 402 that can move horizontally, which is used for hoisting and installing the capping beam 15 and the box girder 17. Through the non-grounded solution of the legs, it is possible to realize the bridge erection construction of multiple components under the constraint of the legs not touching the ground, that is, to complete the hoisting construction of the capping beam and the small box girder, and solve the problems of large interference in the construction conditions of the three-dimensional superposed elevated structure and the existing road crossing and long road closure time. The specific structure of the overhead crane is the prior art.

[0040] In a preferred solution as Figure 9 shown, the capping beam 15 is divided into two pieces longitudinally, and the two pieces of capping beams 15 are hoisted separately and are fixedly connected to each other when at the top of the pier shaft 2. With this structure, the weight of the capping beam hoisted each time is reduced, and the construction difficulty of a bridge with a large spanning length is reduced.

[0041] In a preferred solution as Figure 9 、 10 shown, in a bridge erection system without using a rotating lifting appliance, the length of the main girder 6 covers a range that exceeds two spans and is less than three spans. That is, the length of the main girder 6 only needs to cover three pier shafts 2, and the second overhead crane 5 can hoist the first lifting point of the box girder 17. This greatly shortens the length of the bridge erection system.

[0042] Embodiment 2: In a preferred solution as Figure 7 、 8As shown in the figure, there are two main girders 6. Rear legs 3, middle legs 7, front-middle legs 10 and front legs 11 are successively arranged along the main girder 6. The rear legs 3, middle legs 7, front-middle legs 10 and front legs 11 can move relative to the main girder 6, and the moving direction is the length direction of the main girder 6. As Figures 2 - 4 shown in Figs. 4 and 6, the rear legs 3, front-middle legs 10 and front legs 11 are provided with lifting hydraulic cylinders and guiding mechanisms to realize the lifting of the legs, so as to enable the front-middle legs 10 to support on the top of the capping beam 15 respectively or support on the top of the pier shaft 2 through the supporting cross beam 9. The specific structures of the lifting hydraulic cylinders and guiding mechanisms are prior arts.

[0043] As Figures 2 - 5 shown in the figure, the middle legs 7, front-middle legs 10 and front legs 11 are placed on the transverse movement tracks 8. Wheel boxes are arranged at the bottoms of the middle legs 7 and front-middle legs 10 for moving along the transverse movement tracks 8. During the moving process, the rear legs 3 and front legs 11 are in the raised state. The specific structures of the wheel boxes are prior arts.

[0044] As Figure 7 shown in the figure, a first overhead crane 4 and a second overhead crane 5 are arranged on the main girder 6. A rotating sling 19 is arranged below the first overhead crane 4 and the second overhead crane 5. The rotating sling 19 is used to horizontally rotate the capping beam 15 conveyed along the surface of the box girder 17 by 90° in the air for installation on the top of the pier shaft 2.

[0045] In a preferred embodiment, as Figure 7 shown in the figure, in the rotating sling 19, a connecting beam 191 is used to connect with the capping beam 15. A hinge seat 193 is arranged at the middle position of the connecting beam 191. The hinge seat 193 is hinged to the bottom of the shaft. The shaft is rotatably connected with a hanging beam 194. The hanging beam 194 is connected with the first overhead crane 4 and the second overhead crane 5. Those skilled in the art should know that there are many ways to rotatably connect the shaft and the hanging beam 194. For example, the shaft passes through the end of the hanging beam 194 and is connected with a disc-shaped structure through a flange structure. A thrust bearing is arranged between the disc-shaped structure and the hanging beam 194. Preferably, a spherical plain bearing is used to realize the rotatable connection under the load-bearing state. An alternative solution is that during the rotation process, the rotation of the shaft is controlled by guy ropes, and then the rotation of the capping beam is controlled. There are at least two guy ropes. One end of the guy ropes is arranged at the bridge head, and the other end is connected with the end of the capping beam. The guy ropes are controlled by a winching device at the bridge head to control the rotation of the capping beam. In another alternative solution, teeth are arranged on the outer edge of the disc-shaped structure, and a motor and a speed reduction mechanism are arranged on the hanging beam 194. The rotation of the shaft and the capping beam is controlled by the motor. Additional guy ropes also need to be arranged to ensure the safety during the hoisting process of the capping beam.

[0046] As Figure 7In it, the hinge support 193 is slidably connected to the connecting beam 191, and an adjusting cylinder 192 is provided between the hinge support 193 and the connecting beam 191 to adjust the balance of the connecting beam 191. The telescoping of the adjusting cylinder 192 controls the position of the hinge support 193 on the connecting beam 191, thereby controlling the balance of the connecting beam 191 and the capping beam below it. With the solution of using the rotary spreader 19, the length of the corresponding main beam 6 needs to cover three spans, that is, the length of the main beam 6 needs to cover four groups of pier bodies 2.

[0047] Embodiment 3: As Figure 7 , 8 In it, a construction method of a multi-component non-grounded construction bridge erecting system applicable to the above-mentioned three-dimensional superimposed elevated structure includes the following steps: S01. Move the overhead crane to the tail of the main beam 6 to ensure that the center of gravity of the main beam 6 is towards the rear. Under the supporting state of each leg, move the main beam 6 forward to the top of the N+1 pier body 2. Retract the front leg 11 and the front middle leg 14. The front leg 11 and the supporting cross beam 9 are suspended over the N+1 pier body 2. The front middle leg 14 and the supporting cross beam 9 move to the front side of the top of the N+1 pier body 2 for support; Move the main beam 6 forward to the top of the N+2 pier body 2; In this example, "front" refers to Figure 7 , 8 the right side, and "rear" refers to the left side. The front-rear relationship hereafter shall be based on this.

[0048] S02. Move the front leg 11 and the supporting cross beam 9 to the front side of the top of the N+2 pier body 2 for support, and move the front middle leg 10 to a position close to the front leg 11 to be suspended; S03. The beam transport vehicle 23 transports the first capping beam 151 along the bridge deck to below the rotary spreader 19. The first overhead crane 4 and the second overhead crane 5 lift the first capping beam 151, horizontally rotate it 90° above the N+1 pier body 2, and hoist and install the first capping beam 151 on the front side of the top of the N+1 pier body 2; S04. Hoist and install the second capping beam 152 on the rear side of the top of the N+1 pier body 2 according to step S03, and connect the second capping beam 152 and the first capping beam 151 into a whole; Preferably, the second capping beam 152 and the first capping beam 151 are fixedly connected by welding construction.

[0049] S05. The beam transport vehicle transports the box girder 17 along the bridge deck to the bridgehead. The first overhead crane 4 and the second overhead crane 5 hoist and install the box girder 17 on the capping beam between the N pier body 2 and the N+1 pier body 2, and horizontally move the entire main beam 6 to arrange multiple box girders 17 along the transverse direction of the bridge; The box girder 17 mentioned here refers to a small box girder. The box girders mentioned in the present invention are all small box girders. A small box girder refers to multiple box girders arranged along the transverse direction. The two ends of the box girder are supported on the top of the capping beam. The small box girder can reduce the single lifting weight.

[0050] S06. The middle outrigger 7 moves to the front side of the top of pier N+1 and lands on the second capping beam 152. S07. The front outrigger 11 and the support crossbeam 9 cross over pier N+2 and are suspended, and the front-middle outrigger 14 and the support crossbeam 9 move to the front side of the top of pier N+2 for support. Repeat the above steps to achieve the non-ground construction of multiple components of the three-dimensional composite elevated bridge. The scheme using a rotary spreader is suitable for the hoisting of capping beams with a weight of less than 250t.

[0051] Example 4: The preferred scheme is as Figures 9 - 11 In the figure, there are two main girders 6, and the rear outriggers 3, middle outriggers 7, front-middle outriggers 10, and front outriggers 11 are successively arranged along the main girders 6; the rear outriggers 3, middle outriggers 7, front-middle outriggers 10, and front outriggers 11 can move relative to the main girders 6, and the moving direction is the length direction of the main girders 6. The rear outriggers 3, front-middle outriggers 10, and front outriggers 11 are provided with lifting hydraulic cylinders and guiding mechanisms to realize the lifting of the outriggers, so as to enable the front-middle outriggers 10 to support on the top of the capping beam 15 respectively or support on the top of the pier 2 through the support crossbeam 9. The middle outriggers 7, front-middle outriggers 10, and front outriggers 11 rest on the transverse movement tracks 8, and wheel boxes are provided at the bottoms of the middle outriggers 7 and front-middle outriggers 10 for moving along the transverse movement tracks 8. During the moving process, the rear outriggers 3 and front outriggers 11 are in the raised state. As Figure 10 In the figure, there is also a beam transport trolley 20 for transporting the capping beam 15. A turntable is provided on the top of the beam transport trolley 20 to realize a 90° horizontal rotation on the bridge deck where the box girder 17 has been hoisted through the cooperation of the overhead crane. The beam transport trolley 20 referred to in this example refers to a beam transport vehicle with multiple wheel sets at the bottom and a turntable at the top. The turntable provided is used to assist the rotation of the capping beam. Usually, at least two beam transport trolleys 20 are used in a group. The bottom of the turntable is connected to the top of the vehicle body of the beam transport vehicle through a thrust bearing. The thrust bearing preferably adopts a thrust spherical bearing. The length of the main girder 6 covers a range of more than two spans and less than three spans. That is, the length of the main girder 6 only needs to cover three piers 2. A shorter main girder 6 has a smaller turning radius when used in the construction of a bridge with a curvature, is more flexible in construction, has a lighter self-weight, and lower costs.

[0052] Example 5: For Example 4, the preferred scheme is as Figures 9 - 11 In the figure, a construction method of a bridge erection system for the non-ground construction of multiple components of the three-dimensional composite elevated bridge as described above includes the following steps: S11. Move the overhead crane to the tail of the main girder 6, advance the main girder 6 to the top of pier N+1, retract the front outrigger 11, and move the front outrigger 11 and the support crossbeam 9 to the front side of the top of pier N+1 for support. S12. The two beam transporting trolleys 20 transport the first cap beam 151 to the bridge head along the bridge deck by lifting. The middle support leg 16 retracts to a position close to the rear support leg 18 to avoid the rotation range of the first cap beam 151. The overhead crane is connected to the first lifting point of the first cap beam 151. The other end of the first cap beam 151 is located on a beam transport trolley 20. The main beam 6 moves laterally in coordination with the overhead crane's movement along the bridge and the beam transport trolley 20, assisting the first cap beam 151 in rotating 90° horizontally on the bridge deck. The specific steps of horizontally rotating the first cap beam 151 of the bridge deck are as follows: Figure 11 As shown in , the first cap beam 151 is transported longitudinally to the bridge head, and the overhead crane moves to the top of the middle of the first cap beam 151 and is hoisted and connected to the first hoisting point near the middle of the first cap beam 151. In this example, a double-hoisting-point hoisting device is used. The first hoisting point is lifted to separate one end of the first cap beam 151 from the corresponding beam transport trolley 20, and the other end of the first cap beam 151 falls on the top of the remaining beam transport trolley 20. The beam transport trolley 20 and the overhead crane work together to lift part of the first cap beam 151 to the outside of the bridge head. At this time, the beam transport trolley 20 is located at the bridge head, the main beam 6 moves horizontally, and the overhead crane cooperates to move backward to realize the rotation of the first cap beam 151. The overhead crane retreats to the bridge head position and hoists the first cap beam 151 rotated 90° back onto the two beam transport trolleys 20, so that the first cap beam 151 first falls on the two beam transport trolleys 20 located at the bridge head position. The operation of rotating the first cap beam 151 90° horizontally on the bridge deck is realized. The solution of horizontal rotation of the bridge deck is particularly suitable for working conditions where the cap beam is long and the overall weight is heavy.

[0053] The bridge head position refers to the end position of the bridge deck after the box girder 17 is laid.

[0054] The first cap beam 151 first falls on the two beam transport trolleys 20 located at the bridge head, waiting for hoisting; S13, move the middle support leg 16 forward to a position close to the bridge head, and support the main beam 6, and move the overhead crane to the tail end of the main beam 6; Move the front support leg 11 and the supporting beam 9 forward and hang them in the air, and move the front middle support leg 10 and the supporting beam 9 to the top front side of the N+1 pier 2 to support the main beam 6; The overhead crane hoists the first cap beam 151 to the top rear side of the N+1 pier 2; S14: The middle support leg 16 retracts to a position close to the rear support leg 18, and the second cap beam 152 is rotated 90° horizontally on the bridge deck and falls onto the beam transport trolley 20 at the bridge head, waiting for hoisting; S15, the middle support leg 16 and the rear support leg 18 move forward to a position close to the bridge head to support the main beam 6, so that the main beam 6 moves forward to the top of the N+2 pier 2; The front support leg 11 and the supporting beam 9 move to the front side of the top of the N+2 pier 2, and the front middle support leg 10 and the supporting beam 9 leave the top of the N+1 pier 2; Before the overhead crane hoists the second capping beam 152 to the front side of the top of the pier N+1 2, connect the second capping beam 152 and the first capping beam 151 into a whole; S17. Two girder transport trolleys 20 transport the box girder 17 along the bridge deck to the bridge head. The first overhead crane 4 and the second overhead crane 5 hoist the box girder 17 onto the capping beam between the pier N 2 and the pier N+1 2, and horizontally move the bridge erection system to arrange multiple box girders 17 along the transverse direction of the bridge; Repeat the above steps to realize the non-grounded construction of multiple components of the three-dimensional composite elevated structure.

[0055] In the preferred solution, in step S17, the length of the main girder 6 covers the range of two spans plus the first lifting point of the box girder 17 located on the bridge deck. The second overhead crane 5 moves to above the first lifting point of the box girder 17 and connects with the first lifting point. The second overhead crane 5 hoists to separate one end of the box girder 17 from one girder transport trolley 20. The second overhead crane 5 and the other girder transport trolley 20 move forward until the second lifting point of the box girder 17 is below the first overhead crane 4. Connect the first overhead crane 4 with the second lifting point of the box girder 17, and the first overhead crane 4 and the second overhead crane 5 lift the box girder 17 and install it on the capping beam. The first lifting point refers to the lifting point close to the bridge head, and the second lifting point refers to the lifting point far from the bridge head.

[0056] Example 6: In the preferred solution as Figures 16 - 21 described, there are four main girders 6. The four main girders 6 are divided into two groups and arranged in parallel. There is a third overhead crane 22 on the top of each group of main girders 6; The tail legs 25, middle legs 24, front middle legs 26 and front legs 21 are arranged in sequence along the main girder 6. The tail legs 25, middle legs 24, front middle legs 26 and front legs 21 can move relative to the main girder 6, and the moving direction is the length direction of the main girder 6; The tail legs 25, middle legs 24, front middle legs 26 and front legs 21 are provided with lifting hydraulic cylinders and guiding mechanisms to realize the lifting of the legs, so that the middle legs 24 can respectively support on the box girder 17, capping beam 15 or support cross beam 9, or the front legs 21 or front middle legs 26 can respectively support on the capping beam 15 or support cross beam 9; The tail legs 25 and middle legs 24 rest on the transverse movement tracks 8. There are wheel boxes at the bottoms of the tail legs 25 and middle legs 24 for moving along the transverse movement tracks 8; There is also a girder transport trolley 20 for transporting the capping beam 15. The top of the girder transport trolley 20 is provided with a turntable to realize a 90° horizontal rotation on the surface of the box girder 17 through the cooperation of the overhead crane. The length of the main girder 6 covers a range of more than two spans and less than three spans. That is, the length of the main girder 6 only needs to cover three piers 2.

[0057] Example 7: For Example 6, as Figures 19 - 21In it, S21: Move the third-day vehicle 22 to the tail of the main girder 6, advance the main girder 6 to the top of the N + 1 pier 2, retract the front legs 21 and the front middle legs 26, make the front legs 21 and the support cross beam 9 hang in the air over the N + 1 pier 2, and move the front middle legs 26 to the front side of the top of the N + 1 pier 2; S22: The beam transport trolley 20 transports the first capping beam 151 along the bridge deck to the bridge head. The middle legs 24 retract to a position close to the tail legs 25 for support to avoid the rotation range of the first capping beam 151. The two groups of main girders 6 move laterally, and cooperate with the third-day vehicle 22 of the beam transport trolley 20 to horizontally rotate the first capping beam 151 by 90° on the bridge deck; Preferably, as Figure 20 , 21 shown in, the steps of horizontally rotating the first capping beam 151 by 90° include: Two beam transport trolleys 20 transport the first capping beam 151 to the bridge head in a lifting manner along the bridge deck. One third-day vehicle 22 of one group of main girders is connected to the lifting point at a position close to the middle of the first capping beam 151, lift one end of the first capping beam 151 away from one of the beam transport trolleys 20. The third-day vehicle 22 pulls the first capping beam 151 to move into the air. After avoiding the middle legs 24, the current group of main girders moves laterally, and the third-day vehicle 22 retreats to rotate the first capping beam 151 so that the first capping beam 151 rotates to below the third-day vehicle 22 of the other group of main girders. The current other group of third-day vehicles 22 is connected to the first capping beam 151, and retreats and cooperates with the lateral movement of the current other group of main girders to continue to rotate the first capping beam 151. At the position on the bridge deck, the two third-day vehicles 22 place the first capping beam 151 on the beam transport trolley 20, and readjust the lifting points to complete the horizontal rotation of the first capping beam 151 by 90°; S23: The third-day vehicles 22 on the two groups of main girders 6 hoist and install the first capping beam 151 to the rear side of the top of the N + 1 pier 2 in a lifting manner; S24: Horizontally rotate the second capping beam 152 by 90° according to step S22 and place it on the beam transport trolley 20 located at the bridge head position; S25: The middle legs 24 move to a position close to the second capping beam 152, the main girders 6 move forward to the top of the N + 2 pier 2, and the front legs 21 and the support cross beam 9 move to the front side of the top of the N + 2 pier 2; S26: Retract the front middle legs 26, and move the front middle legs 26 and the support cross beam 9 to a position close to the N + 2 pier 2 and hang in the air; S27: The third-day vehicles 22 on the two groups of main girders 6 hoist and install the second capping beam 152 to the front side of the top of the N + 1 pier 2 in a lifting manner, and connect the first capping beam 151 and the second capping beam 152 into one body; The beam transport vehicle 23 transports the box girder 17 along the bridge deck to the bridge head. The third-day vehicle 22 hoists and installs the box girder 17 on the capping beam between the N pier 2 and the N + 1 pier 2, and laterally moves the main girders 6 of each group to arrange multiple box girders 17 along the transverse direction of the bridge; S28. The middle leg 24 moves to the position at the rear side of the bridgehead on the top of the pier N+1. On the third day, the vehicle 22 moves to the tail of the main girder 6. The front leg 21 and the front middle leg 26 retract. The front leg 21 and the support cross beam 9 are suspended over the pier N+2. The front middle leg 26 moves to the front side on the top of the pier N+2. Repeat the above steps to realize the non-ground construction of multiple components of the three-dimensional composite elevated bridge with the structure of four main girders.

[0058] Example 8: This example is applicable to all the above examples. The preferred scheme is as follows Figures 12 - 14 In the middle, a sliding seat 93 that slides along the beam body 91 is provided at the bottom of the beam body 91 of the support cross beam 9. The number of sliding seats 93 is the same as the number of corresponding piers 2. The beam body 91 is formed by welding two I-beams. Grooves are provided on both sides of the beam body 91. The top of the sliding seat 93 is connected to the grooves on both sides of the beam body 91 through a hanging wheel 92. A gap is provided between the hanging wheel 92 and the groove. When the beam is lowered, the beam body 91 lands on the top of the sliding seat 93, and the frictional force makes the sliding seat 93 unable to slide relatively, forming a pier structure. A plurality of extension seats 94 extending downward are provided at the bottom of the sliding seat 93. A gap is provided between the extension seats 94 to avoid the steel bars 96. The steel bars 96 are the reserved steel bars at the top of the pier 2 and are used for connecting with the capping beam. A plunger 95 is provided at the bottom of the extension seat 94. The plunger 95 is hermetically and movably arranged in a vertical cylinder 97. A communication port 99 is provided between the cylinders 97 of each plunger 95. A liquid inlet 98 is provided on one of the cylinders 97.

[0059] Example 9: In the preferred scheme, before the support cross beam 9 lands on the top of the pier 2, the position of the sliding seat 93 is moved to avoid the end of the steel bar 96, and the plunger 95 lands on the top of the pier 2. Hydraulic oil is input into the liquid inlet 98 to make the plunger 95 extend and contact with the top of the pier 2. The pressure of the hydraulic oil is balanced between the cylinders 97, and the pressure received by the support cross beam 9 is evenly distributed to each plunger 95 to compensate for the flatness error at the top of the pier 2. In the preferred scheme, when there is a level error between the support cross beams 9 among the piers 2, the level of the support cross beam 9 can also be adjusted by injecting different volumes of hydraulic oil into each sliding seat 93, such as the level error caused by the construction operation error during pouring and the shrinkage of concrete.

[0060] Although the present application has been described in connection with specific features and their embodiments, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the present application. Accordingly, the present specification and the drawings are merely exemplary illustrations of the present application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. A multi-component non-grounded construction bridge system applicable to a three-dimensional stacked elevated structure, characterized in that: It includes at least two main girders (6), and the main girders are supported on the top of the box girder (17), the capping beam (15) or the pier shaft (2) through legs. A support cross beam (9) is provided between the legs and the pier shaft (2), and the support cross beam (9) spans across the tops of multiple pier shafts (2); At least one overhead crane is provided on the top of the main girder (6). The overhead crane is provided with a lifting trolley (402) that can move horizontally, which is used for lifting and installing the capping beam (15) and the box girder (17).

2. The multi-component non-grounded construction bridge system applicable to the three-dimensional superposed elevated structure according to claim 1, characterized in that: The capping beam (15) is longitudinally divided into two pieces, and the two pieces of capping beam (15) are hoisted separately. When the two pieces of capping beam (15) are at the top of the pier shaft (2), they are fixedly connected to each other; The length of the main girder (6) covers a range that exceeds two spans and is less than three spans.

3. The multi-component non-grounded construction bridge system applicable to the three-dimensional stacked elevated structure according to claim 1 or 2, characterized in that: There are two main girders (6). Along the main girders (6), there are a rear leg (3), a middle leg (7), a front-middle leg (10) and a front leg (11) in sequence; The rear leg (3), the middle leg (7), the front-middle leg (10) and the front leg (11) can move relative to the main girder (6), and the moving direction is the length direction of the main girder (6); The rear leg (3), the front-middle leg (10) and the front leg (11) are provided with lifting hydraulic cylinders and guiding mechanisms to realize the lifting of the legs, so as to facilitate the front-middle leg (10) to support on the top of the capping beam (15) or support on the top of the pier shaft (2) through the support cross beam (9); The middle leg (7), the front-middle leg (10) and the front leg (11) are placed on the transverse movement track (8). Wheel boxes are provided at the bottoms of the middle leg (7) and the front-middle leg (10) for moving along the transverse movement track (8). During the moving process, the rear leg (3) and the front leg (11) are in the raised state; A first overhead crane (4) and a second overhead crane (5) are provided on the main girder (6). A rotary sling (19) is provided below the first overhead crane (4) and the second overhead crane (5). The rotary sling (19) is used to horizontally rotate the capping beam (15) conveyed along the surface of the box girder (17) by 90° in the air for installation on the top of the pier shaft (2).

4. The multi-component non-grounded construction bridge system applicable to the three-dimensional overlapping elevated structure according to claim 3, characterized in that: In the rotary sling (19), a connecting beam (191) is used to connect with the capping beam (15). A hinge seat (193) is provided at the middle position of the connecting beam (191). The hinge seat (193) is hinged to the bottom of the shaft, and the shaft is rotatably connected to the lifting beam (194). The lifting beam (194) is connected to the first overhead crane (4) and the second overhead crane (5); The hinge seat (193) is slidably connected to the connecting beam (191). An adjusting oil cylinder (192) is provided between the hinge seat (193) and the connecting beam (191) to adjust the balance of the connecting beam (191).

5. The multi-component non-grounded construction bridge system applicable to the three-dimensional laminated elevated structure according to claim 1 or 2, characterized in that: There are two main girders (6). Along the main girders (6), there are a rear leg (3), a middle leg (7), a front-middle leg (10) and a front leg (11) in sequence; The rear leg (3), the middle leg (7), the front-middle leg (10) and the front leg (11) can move relative to the main girder (, and the moving direction is the length direction of the main girder (6); The rear outriggers (3), front middle outriggers (10) and front outriggers (11) are provided with lifting hydraulic cylinders and guiding mechanisms to realize the lifting of the outriggers, so as to facilitate the front middle outriggers (10) to be respectively supported on the top of the capping beam (15) or supported on the top of the pier shaft (2) through the support cross beam (9); The middle outriggers (7), front middle outriggers (10) and front outriggers (11) are placed on the transverse movement tracks (8). Wheel boxes are provided at the bottoms of the middle outriggers (7) and front middle outriggers (10) for moving along the transverse movement tracks (8). During the movement process, the rear outriggers (3) and front outriggers (11) are in the raised state; There is also a beam transporting trolley (20) for transporting the capping beam (15). A turntable is provided at the top of the beam transporting trolley (20) to realize a 90° horizontal rotation on the surface of the box girder (17) through the cooperation of the overhead crane; 6. The multi-component non-grounded construction bridge system applicable to the three-dimensional superposed elevated structure according to claim 1 or 2, characterized in that: There are four main girders (6), covering two spans of pier shafts (2). The four main girders (6) are divided into two groups and arranged in parallel. A third overhead crane (22) is provided at the top of each group of main girders (6); A tail leg (25), a middle leg (24), a front middle leg (26) and a front leg (21) are successively arranged along the main girder (6). The tail leg (25), middle leg (24), front middle leg (26) and front leg (21) can move relative to the main girder (6), and the moving direction is the length direction of the main girder (6); The tail leg (25), middle leg (24), front middle leg (26) and front leg (21) are provided with lifting hydraulic cylinders and guiding mechanisms to realize the lifting of the legs, so that the middle leg (24) can be respectively supported on the box girder (17), capping beam (15) or support cross beam (9), or the front leg (21) or front middle leg (26) can be respectively supported on the capping beam (15) or support cross beam (9); The tail leg (25) and the middle leg (24) are placed on the transverse movement tracks (8). Wheel boxes are provided at the bottoms of the tail leg (25) and the middle leg (24) for moving along the transverse movement tracks (8); There is also a beam transporting trolley (20) for transporting the capping beam (15). A turntable is provided at the top of the beam transporting trolley (20) to realize a 90° horizontal rotation on the surface of the box girder (17) through the cooperation of the overhead crane; 7. The multi-component non-grounded construction bridge system applicable to the three-dimensional stacked elevated structure according to any one of claims 1 to 2 and 4, characterized in that: A sliding seat (93) that slides along the beam body (91) is provided at the bottom of the beam body (91) of the support cross beam (9). The number of sliding seats (93) is the same as the number of corresponding pier shafts (2). The top of the sliding seat (93) is connected to the grooves on both sides of the beam body (91) through hanging wheels (92). There is a gap between the hanging wheels (92) and the grooves. When the beam is lowered, the beam body (91) lands on the top of the sliding seat (93); A plurality of extension seats (94) are provided at the bottom of the sliding seat (93). The extension seats (94) avoid the steel bars (96). A plunger (95) is provided at the bottom of the extension seat (94), and the plunger (95) is movably arranged in a vertical cylinder body (97); A communication port (99) is provided between the cylinder bodies (97) of each plunger (95), and a liquid inlet (98) is provided on one of the cylinder bodies (97).

8. A construction method for a multi-component non-grounded construction bridge system applicable to a three-dimensional superimposed elevated structure as described in any one of claims 3 to 4 and 7, characterized in that It includes the following steps: S01. Move the overhead crane to the tail of the main girder (6), advance the main girder (6) to the top of the N+1 pier (2), retract the front legs (11) and the front middle legs (14), let the front legs (11) and the support crossbeam (9) hang over the N+1 pier (2), and move the front middle legs (14) and the support crossbeam (9) to the front side of the top of the N+1 pier (2) for support; Advance the main girder (6) to the top of the N+2 pier (2); S02. Move the front legs (11) and the support crossbeam (9) to the front side of the top of the N+2 pier (2) for support, and move the front middle legs (10) to a position close to the front legs (11) to hang in the air; S03. The beam transporter (23) transports the first capping beam (151) along the bridge deck to below the rotary spreader (19), and the first overhead crane (4) and the second overhead crane (5) lift the first capping beam (151), horizontally rotate it 90° above the N+1 pier (2), and hoist and install the first capping beam (151) on the front side of the top of the N+1 pier (2); S04. Hoist and install the second capping beam (152) on the rear side of the top of the N+1 pier (2) according to step S03, and connect the second capping beam (152) and the first capping beam (151) into a whole; S05. The beam transporter transports the box girder (17) along the bridge deck to the bridgehead. The first overhead crane (4) and the second overhead crane (5) hoist and install the box girder (17) on the capping beam between the N pier (2) and the N+1 pier (2), and horizontally move the entire main girder (6) to arrange multiple box girders (17) transversely along the bridge; S06. Move the middle legs (7) to the front side of the top of the N+1 pier (2) and land on the second capping beam (152); S07. The front legs (11) and the support crossbeam (9) hang over the N+2 pier (2), and the front middle legs (14) and the support crossbeam (9) move to the front side of the top of the N+2 pier (2) for support; Repeat the above steps to realize the non-ground construction of multiple components of the three-dimensional composite viaduct.

9. A construction method for a multi-component non-grounded construction bridge system applicable to a three-dimensional superposed elevated structure according to any one of claims 5 and 7, characterized in that The steps include: S11. Move the overhead crane to the tail of the main girder (6), advance the main girder (6) to the top of the N+1 pier (2), and move the front legs (11) and the support crossbeam (9) to the front side of the top of the N+1 pier (2) for support; S12. The two beam transport trolleys (20) transport the first capping beam (151) along the bridge deck in a lifting manner to the bridgehead. The middle legs (16) retract to a position close to the rear legs (18) to avoid the rotation range of the first capping beam (151); Connect the overhead crane to the first lifting point of the first capping beam (151). The other end of the first capping beam (151) is located on one beam transport trolley (20). The main girder (6) transversely moves in cooperation with the overhead crane moving longitudinally along the bridge and the movement of the beam transport trolley (20) to assist the first capping beam (151) in horizontally rotating 90° on the bridge deck; The first capping beam (151) first lands on the two beam transport trolleys (20) at the bridgehead position and waits for hoisting; The bridgehead position refers to the end position of the bridge deck after the box girder 17 is laid; S13. Move the middle legs (16) forward to a position close to the bridgehead and support the main girder (6), and move the overhead crane to the tail of the main girder (6); Move the front support leg (11) and the supporting crossbeam (9) forward and suspend them in the air, and move the front middle support leg (10) and the supporting crossbeam (9) to the top front side of the N+1 pier (2) to support the main beam (6); The overhead crane hoists the first cap beam (151) to the top rear side of the N+1 pier (2); S14, the middle support leg (16) is retracted to a position close to the rear support leg (18), and the second cap beam (152) is rotated 90 degrees horizontally on the bridge deck and falls on the beam transport trolley (20) at the bridge head position to wait for lifting; S15, the middle support leg (16) and the rear support leg (18) move forward to a position close to the bridge head to support the main beam (6), so that the main beam (6) moves forward to the top of the N+2 pier (2); The front support leg (11) and the supporting beam (9) move to the front side of the top of the N+2 pier (2), and the front middle support leg (10) and the supporting beam (9) leave the top of the N+1 pier (2); S16, the overhead crane hoists the second cap beam (152) to the top front side of the N+1 pier body (2), and connects the second cap beam (152) and the first cap beam (151) into a whole; S17, two beam transporting trolleys (20) transport the box beam (17) to the bridge head along the bridge deck, the first trolley (4) and the second trolley (5) hoist the box beam (17) onto the cap beam between the N pier (2) and the N+1 pier (2), and move the bridge erection system transversely so that multiple box beams (17) are arranged along the transverse direction of the bridge; Repeat the above steps to realize the non-ground construction of multiple components of the three-dimensional superimposed elevated structure.

10. The construction method of the multi-component non-ground construction bridge erection system applicable to the three-dimensional superimposed elevated structure according to claim 9 is characterized by: In step S12, the first cap beam (151) is longitudinally transported to the bridge head, the overhead crane moves to the top of the middle of the first cap beam (151), and is hoisted and connected to the first lifting point near the middle of the first cap beam (151), and the first lifting point is lifted so that one end of the first cap beam (151) is separated from the corresponding beam transport trolley (20), and the other end of the first cap beam (151) falls on the top of the remaining beam transport trolley (20). The beam transport trolley (20) and the overhead crane jointly lift the first cap beam (151) to the outside of the bridge head. At this time, the beam transport trolley (20) is located at the bridge head, the main beam (6) moves horizontally, and the overhead crane cooperates to move backward to realize the rotation of the first cap beam (151). The overhead crane retreats to the bridge head position and hoists the first cap beam (151) after rotating 90° back onto the two beam transport trolleys (20), realizing the operation of rotating the first cap beam (151) 90° horizontally on the bridge deck; In step S17, the length of the main beam (6) covers the range of two spans plus the first lifting point of the box beam (17) located on the bridge deck, the second car (5) moves to the top of the first lifting point of the box beam (17) and is connected to the first lifting point, the second car (5) lifts and separates one end of the box beam (17) from a beam transport trolley (20), the second car (5) and the other beam transport trolley (20) move forward until the second lifting point of the box beam (17) is located below the first car (4), the first car (4) is connected to the second lifting point of the box beam (17), the first car (4) and the second car (5) lift the box beam (17) and install it on the cap beam.

11. A construction method of a multi-component non-grounded construction bridge erection system applicable to a three-dimensional superimposed elevated structure according to any one of claims 6 to 7, characterized in that It includes the following steps: S21. Move the third overhead crane (22) to the tail of the main girder (6), advance the main girder (6) to the top of the (N + 1)th pier (2), retract the front legs (21) and the front middle legs (26), make the front legs (21) and the support cross beam (9) hang over the (N + 1)th pier (2), and move the front middle legs (26) to the front side of the top of the (N + 1)th pier (2); S22. The beam transport trolley (20) transports the first capping beam (151) along the bridge deck to the bridgehead. The middle legs (24) retract to a position close to the tail legs (25) for support to avoid the rotation range of the first capping beam (151). The two groups of main girders (6) move transversely, and cooperate with the third overhead crane (22) to assist the beam transport trolley (20) to horizontally rotate the first capping beam (151) by 90° on the bridge deck; The two beam transport trolleys (20) transport the first capping beam (151) along the bridge deck in a way of lifting and transporting. One third overhead crane (22) of one group of main girders is connected to the lifting point at the position close to the middle of the first capping beam (151), lift one end of the first capping beam (151) off one of the beam transport trolleys (20), and the third overhead crane (22) pulls the first capping beam (151) to move into the air. After avoiding the middle legs (24), the current group of main girders moves transversely, and the third overhead crane (22) retreats to rotate the first capping beam (151) so that the first capping beam (151) rotates to below the third overhead crane (22) of the other group of main girders. The current other third overhead crane (22) is connected to the first capping beam (151), and retreats in cooperation with the transverse movement of the current other group of main girders to continue rotating the first capping beam (151). At the position on the bridge deck, the two third overhead cranes (22) place the first capping beam (151) on the beam transport trolley (20), readjust the lifting points, and complete the horizontal rotation of the first capping beam (151) by 90°; S23. The third overhead cranes (22) on the two groups of main girders (6) hoist and install the first capping beam (151) to the rear side of the top of the (N + 1)th pier (2) in a way of lifting; S24. Horizontally rotate the second capping beam (152) by 90° according to step S22 and place it on the beam transport trolley (20) at the bridgehead position; S25. Move the middle legs (24) to a position close to the second capping beam (152), advance the main girders (6) to the top of the (N + 2)th pier (2), and move the front legs (21) and the support cross beam (9) to the front side of the top of the (N + 2)th pier (2); S26. Retract the front middle legs (26), and move the front middle legs (26) and the support cross beam (9) to a position close to the (N + 2)th pier (2) to hang in the air; S27. The third overhead cranes (22) on the two groups of main girders (6) hoist and install the second capping beam (152) to the front side of the top of the (N + 1)th pier (2) in a way of lifting, and connect the first capping beam (151) and the second capping beam (152) into one body; The beam transport vehicle (23) transports the box girder (17) along the bridge deck to the bridgehead. The third overhead crane (22) hoists and installs the box girder (17) on the capping beam between the Nth pier (2) and the (N + 1)th pier (2), and horizontally move the main girders (6) of each group to arrange multiple box girders (17) transversely along the bridge; S28. The middle leg (24) moves to the position at the rear of the bridgehead on the top of the N+1 pier (2). On the third day, the vehicle (22) moves to the tail of the main girder (6). The front leg (21) and the front middle leg (26) retract. The front leg (21) and the support cross beam (9) are suspended over the N+2 pier (2). The front middle leg (26) moves to the front side of the top of the N+2 pier (2). Repeat the above steps to achieve the non-ground construction of multiple components of the three-dimensional composite viaduct with a four-main girder structure.

12. The construction method of the multi-component non-grounded construction bridge system applicable to the three-dimensional stacked elevated structure according to any one of claims 8 to 10, characterized in that: Before the support cross beam (9) lands on the top of the pier (2), move the position of the sliding seat (93) so that the extension seat (94) avoids the end of the steel bar (96), and the plunger (95) lands on the top of the pier (2). Input hydraulic oil into the feed liquid port (98) to make the plunger (95) extend and contact the top of the pier (2). The pressure of the hydraulic oil is balanced among the cylinders (97), and the pressure received by the support cross beam (9) is evenly distributed to each plunger (95) to compensate for the flatness error of the top of the pier (2).

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