A single-girder ultra-low double-span beam erection construction equipment and construction method

Abstract

This application relates to a single-girder ultra-low double-span beam erection construction equipment and construction method, including: a bridge girder erection machine, which includes a main girder, a front auxiliary support leg, a front support leg, a middle support leg, and a rear support leg that are sequentially connected to the main girder from front to back. The main girder is also connected with a front crane and a rear crane for lifting box girders. The height of the middle support leg is telescopic and its width is less than the width of the box girder; a beam transporter, which includes a front beam transporter and a rear beam transporter for transporting box girders; a conversion support, which includes a front conversion support and a rear conversion support for converting and supporting the box girder to be erected transported by the front beam transporter and the rear beam transporter above the erected box girder. The front conversion support and the rear conversion support can lift the box girder to move up and down. When encountering special extremely low clearance working conditions, this application converts the box girder on the beam transporter to the front conversion support and the rear conversion support, further reducing the ground clearance of the box girder, so that the bridge girder erection machine can erect the box girder under a lower limit position.

Description

Technical Field

[0001] The present application relates to the field of bridge construction equipment, and particularly relates to a single-girder ultra-low double-span beam erection construction equipment and a construction method. Background Art

[0002] With the increasingly complex construction environments of high-speed railways, intercity railways, and urban rail transit, there are existing continuous ultra-low gantry piers on the line. In the longitudinal direction of the bridge, the positions of the gantry piers either coincide with the piers or are between the piers. At the same time, the construction line is adjacent to the existing line, the pier center-to-center distance is small, and there are different height differences. The erection of box girders is limited not only in the height direction but also in the width direction, and the entire line working conditions are extremely complex.

[0003] In related technologies, the middle support leg of the single-girder bridge erecting machine in the current market is of an O-shaped structure. In the traditional erection method, after the front and rear lifting trolleys pick up the beam, they need to pass through the middle support leg. However, due to the clearance requirements of the line, the width of the middle support leg cannot exceed the width of the box girder, and it is also restricted in the height direction, resulting in limited height for beam picking, and at the same time, the box girder cannot pass through the middle support leg. The traditional erection method cannot meet the erection requirements of this line, and the existing equipment and construction methods in the current market cannot meet the erection of this line. Summary of the Invention

[0004] The embodiments of the present application provide a single-girder ultra-low double-span beam erection construction equipment and a construction method to solve the problem that it is difficult for a single-girder bridge erecting machine in related technologies to meet the beam erection construction in an environment with limited width and height.

[0005] The first aspect of the embodiments of the present application provides a single-girder ultra-low double-span beam erection construction equipment, including:

[0006] A bridge erecting machine, which includes a main girder, a front auxiliary support leg, a front support leg, a middle support leg, and a rear support leg that are sequentially connected to the main girder from front to back. The main girder is also connected with a front lifting trolley and a rear lifting trolley for hoisting the box girder. The height of the middle support leg is telescopic and its width is less than the width of the box girder;

[0007] A beam transport vehicle, which includes a front beam transport vehicle and a rear beam transport vehicle for transporting the box girder. The front beam transport vehicle and the rear beam transport vehicle are used to jointly transport the box girder to be erected to the beam erection position where the bridge erecting machine is located;

[0008] A conversion support, which includes a front conversion support and a rear conversion support for converting and supporting the box girder to be erected transported by the front beam transport vehicle and the rear beam transport vehicle above the erected box girder. The front conversion support and the rear conversion support can lift the box girder to be erected for lifting movement.

[0009] In some embodiments: the middle outrigger includes a frame assembly and a suspension assembly connected to each other. The frame assembly includes an upper cross beam located at the top of the main beam, a lower cross beam located at the bottom of the main beam, and a telescopic support column connected between the upper cross beam and the lower cross beam;

[0010] The suspension assembly includes a suspension frame that is horizontally slidably connected to the upper cross beam and partially overlaps in the height direction. The suspension frame is connected to the main beam through a lower support traveling mechanism and an upper support traveling mechanism and moves longitudinally relative to the main beam.

[0011] In some embodiments: upper flange plates and lower flange plates extending along the length direction of the main beam are respectively provided on both sides of the main beam. The lower support traveling mechanism is supported on the top surface of the lower flange plate, the upper support traveling mechanism is supported on the bottom surface of the upper flange plate, and driving mechanisms for driving the middle outrigger to move longitudinally relative to the main beam are respectively provided on both sides of the suspension frame.

[0012] In some embodiments: both the front conversion support and the rear conversion support include a beam carrier for lifting the box girder to be erected, and support columns slidably connected to both ends of the beam carrier. There are supports at the bottoms of the support columns, and lifting cylinders for driving the beam carrier to move up and down in the height direction of the support columns are provided on the supports.

[0013] In some embodiments: the front conversion support and the rear conversion support are respectively detachably connected to the front girder carrier and the rear girder carrier. A plurality of positioning holes arranged in sequence from bottom to top are provided on the support columns, pins for positioning the support height of the beam carrier are inserted into the positioning holes, and rubber pads for padding the box girder to be erected are provided on the top of the beam carrier.

[0014] In some embodiments: the girder erecting machine further includes a front auxiliary outrigger located in front of the front outrigger and moving along the length direction of the main beam. The top of the rear outrigger is hinged to the tail end of the main beam through a rotating shaft. Before the girder carrier transports the box girder to be erected under the main beam, the rear outrigger flips upward, and a front beam carrier trolley and a rear beam carrier trolley are respectively slidably connected to the front girder carrier and the rear girder carrier.

[0015] The second aspect of the embodiments of the present application provides a single-main-beam ultra-low double-span girder erection construction method. The method uses the single-main-beam ultra-low double-span girder erection construction equipment described in any of the above embodiments. The method includes:

[0016] Support the main beam using the front outrigger and the middle outrigger, flip the rear outrigger upward, transport the box girder into the bottom of the girder erecting machine by the girder carrier, and the rear girder carrier transports the box girder to the designated position;

[0017] Flip the rear outrigger downward and support it on the rear girder carrier. Lower the height of the rear girder carrier, and the middle outrigger contracts and retreats to a specified position away from the rear outrigger and stops;

[0018] The front crane and the rear crane retreat to the beam-taking position above the front beam carrier. The front crane and the rear beam carrier synchronously drag the box girder forward to make way for the support position of the middle support leg.

[0019] After the middle support leg extends and stands on the rear beam carrier and converts the support with the rear support leg, after the middle support leg extends and supports in place, the rear crane retreats to the rear beam-taking position to take the beam.

[0020] After the front crane and the rear crane lift the box girder and move forward to the in-place position, the front crane and the rear crane align the box girder with the pier and then lower the beam.

[0021] In some embodiments, the method further includes:

[0022] After the box girder falls in place, the front support leg is anchored to the box girder. The front support leg and the rear support leg support the main girder. The middle support leg shortens and moves forward longitudinally while suspended to the through-hole position to support the main girder. Then the rear support leg is suspended to prepare for passing through the hole.

[0023] The front support leg and the middle support leg drive the main girder to move forward longitudinally to the in-place position. The front auxiliary support leg retreats synchronously. The front crane and the rear crane retreat synchronously to the vicinity of the middle support leg position.

[0024] The front auxiliary support leg moves forward to the center position of the front pier and then supports the main girder.

[0025] The rear support leg, the front support leg and the front auxiliary support leg support the main girder. The middle support leg contracts and leaves the ground. The front crane and the rear crane move forward with the middle support leg to the rear of the front support leg.

[0026] After the middle support leg extends to support the main girder, the anchoring of the front support leg to the box girder is released. The front support leg longitudinally moves to the designated position of the front pier and then supports the main girder. The front auxiliary support leg contracts and is suspended, and longitudinally moves forward to the designated position.

[0027] The front crane and the rear crane longitudinally move forward to the rear of the front support leg. After the middle support leg contracts, it longitudinally moves forward again to a specified distance from the beam end and then supports the main girder.

[0028] The bridge erecting machine is jacked up to the beam erection height, and the rear support leg is turned up to prepare for the erection of the next box girder.

[0029] The third aspect of the embodiments of the present application provides a construction method for erecting a single main girder with ultra-low position and double spans. The method uses the construction equipment for erecting a single main girder with ultra-low position and double spans described in any of the above embodiments. The method includes:

[0030] Adjust the support height of the bridge erecting machine according to the height of the underpass structure, turn up the rear support leg, transport the box girder into the bottom of the bridge erecting machine by the beam carrier, and lower the oil cylinder support legs of the front beam carrier.

[0031] The rear outriggers are flipped downwards and then supported on the bridge deck. The rear beam transporter pushes the box girder forward to the designated position. The front outriggers, middle outriggers and rear outriggers are alternately lowered so that the upper surface of the main beam of the bridge erecting machine is at a set distance from the bottom surface of the structure.

[0032] The middle outriggers contract and move forward to the designated position. The front conversion support and the front beam transporter switch supports. The box girder is disengaged from the front beam transporter and supported on the front conversion support.

[0033] The front beam transporter moves forward to the end of the beam, stops and lowers the hydraulic cylinder outriggers, drives the front beam carrier trolley backwards to the support position, and transfers the box girder on the front conversion support to the front beam carrier trolley.

[0034] The rear beam transporter pushes the front beam carrier trolley to synchronously feed the beam to the designated position, and the front conversion support runs to the designated position synchronously.

[0035] The front conversion support and the rear conversion support synchronously lift the box girder off the front beam carrier trolley and the rear beam carrier trolley, and the front beam transporter and the rear beam transporter withdraw.

[0036] The front conversion support and the rear conversion support are lowered to the lowest position. The front outriggers and the rear outriggers alternately lift the main beam to the beam erection height to provide space for the middle outriggers to retreat.

[0037] After the middle outriggers retreat a specified distance, they reach the beam erection position. The middle outriggers extend and are supported on the bridge deck. The front crane and the rear crane synchronously retreat to the beam fetching position to prepare to fetch the box girder.

[0038] The front crane and the rear crane fetch the box girder and longitudinally move forward to the beam dropping position. The front outriggers and the middle outriggers laterally move the main beam to accurately align and drop the beam.

[0039] In some embodiments, the method further includes:

[0040] After the box girder drops in place, the front outriggers are anchored to the box girder. The bridge erecting machine is lowered so that the upper surface of the main beam is at a set distance from the bottom surface of the structure. After the rear crane lifts the front conversion support and retreats to the designated position, the rear crane retracts the hook and returns.

[0041] The rear crane travels to the rear of the front crane. The front outriggers and the rear outriggers support the main beam. The middle outriggers contract and are suspended, and then longitudinally move forward to the through-hole support position to support.

[0042] The rear outriggers are flipped upwards. The front beam transporter and the rear beam transporter enter the tail of the bridge erecting machine, lift the front conversion support and the rear conversion support, and then withdraw.

[0043] The front outriggers and the middle outriggers drive the main beam to longitudinally move forward to the designated position. The front auxiliary outriggers synchronously retreat. At the same time, the front crane and the rear crane retreat to near the middle outriggers.

[0044] The front auxiliary outriggers move forward to the center position of the front pier and then support the main beam.

[0045] The rear outriggers are turned downward to support on the bridge deck, the middle outriggers retract from the ground, and the front crane truck and the rear crane truck, together with the middle outriggers, move forward to the rear of the front outriggers;

[0046] After the middle outriggers extend to support the main girder, the anchorage between the front outriggers and the box girder is released. After the front outriggers longitudinally move to the designated position of the front pier and support the main girder, the front auxiliary outriggers retract and hang in the air, and then longitudinally move forward to the designated position;

[0047] The front crane truck and the rear crane truck longitudinally move forward to the rear of the front outriggers. After the middle outriggers retract, they longitudinally move forward again by a specified distance from the beam end and then support the main girder;

[0048] The bridge girder erecting machine is lifted to the beam erecting height, and the rear outriggers are turned upward to prepare for the erection of the next box girder.

[0049] The beneficial effects brought by the technical solution provided by this application include:

[0050] The embodiment of this application provides a single-main girder ultra-low-position double-span beam erecting construction equipment and construction method. Since the single-main girder ultra-low-position double-span beam erecting construction equipment of this application is provided with a bridge girder erecting machine, the bridge girder erecting machine includes a main girder, a front auxiliary outrigger, a front outrigger, a middle outrigger, and a rear outrigger that are sequentially connected to the main girder from front to back. The main girder is also connected with a front crane truck and a rear crane truck for lifting the box girder. The height of the middle outrigger is telescopic and its width is less than the width of the box girder; a beam transporter, which includes a front beam transporter and a rear beam transporter for transporting the box girder. The front beam transporter and the rear beam transporter are used to jointly transport the box girder to be erected to the beam erecting work station where the bridge girder erecting machine is located; a conversion support, which includes a front conversion support and a rear conversion support for converting and supporting the box girder to be erected transported by the front beam transporter and the rear beam transporter above the erected box girder. The front conversion support and the rear conversion support can lift the box girder to move up and down.

[0051] Therefore, the single-main girder ultra-low-position double-span beam erecting construction equipment of this application designs a middle outrigger with a telescopic height and a width less than the width of the box girder for special working conditions of the line. The overall width of the middle outrigger is designed to be less than the width of the box girder. In the height direction, the ultra-low height requirement of the middle outrigger can be realized through telescoping. Finally, it can meet the requirement that the lower part of the middle outrigger crosses the beam surface and the upper part passes through the limited-height portal pier, and finally supports on the rear beam transporter or the bridge deck. The conversion support includes a front conversion support and a rear conversion support for converting and supporting the box girder to be erected transported by the front beam transporter and the rear beam transporter above the erected box girder. When encountering special ultra-low limited-height working conditions, the box girder on the beam transporter is converted to the front conversion support and the rear conversion support, further reducing the height of the box girder, so that the bridge girder erecting machine can realize the erection of the box girder under a lower limit position. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0053] Figure 1 Structural schematic diagram of the girder transport vehicle cooperating with the girder erecting machine in the embodiment of the present application;

[0054] Figure 2 Structural schematic diagram of the conversion support cooperating with the girder erecting machine in the embodiment of the present application;

[0055] Figure 3 Front view of the structure of the outrigger in the embodiment of the present application;

[0056] Figure 4 Side view of the structure of the outrigger in the embodiment of the present application;

[0057] Figure 5 Front view of the structure of the front conversion support in the embodiment of the present application;

[0058] Figure 6 Side view of the structure of the front conversion support in the embodiment of the present application;

[0059] Figure 7 Structural schematic diagram of step 1 in the first construction method of the embodiment of the present application;

[0060] Figure 8 Structural schematic diagram of step 2 in the first construction method of the embodiment of the present application;

[0061] Figure 9 Structural schematic diagram of step 3 in the first construction method of the embodiment of the present application;

[0062] Figure 10 Structural schematic diagram of step 4 in the first construction method of the embodiment of the present application;

[0063] Figure 11 Structural schematic diagram of step 5 in the first construction method of the embodiment of the present application;

[0064] Figure 12 Structural schematic diagram of step 6 in the first construction method of the embodiment of the present application;

[0065] Figure 13 Structural schematic diagram of step 7 in the first construction method of the embodiment of the present application;

[0066] Figure 14 Structural schematic diagram of step 8 in the first construction method of the embodiment of the present application;

[0067] Figure 15 Schematic diagram of step 9 in the first construction method of the embodiment of the present application;

[0068] Figure 16 Schematic diagram of step 10 in the first construction method of the embodiment of the present application;

[0069] Figure 17 Schematic diagram of step 11 in the first construction method of the embodiment of the present application;

[0070] Figure 18 Schematic diagram of step 12 in the first construction method of the embodiment of the present application;

[0071] Figure 19 Schematic diagram of step 1 in the second construction method of the embodiment of the present application;

[0072] Figure 20 Schematic diagram of step 2 in the second construction method of the embodiment of the present application;

[0073] Figure 21 Schematic diagram of step 3 in the second construction method of the embodiment of the present application;

[0074] Figure 22 Schematic diagram of step 4 in the second construction method of the embodiment of the present application;

[0075] Figure 23 Schematic diagram of step 5 in the second construction method of the embodiment of the present application;

[0076] Figure 24 Schematic diagram of step 6 in the second construction method of the embodiment of the present application;

[0077] Figure 25 Schematic diagram of step 7 in the second construction method of the embodiment of the present application;

[0078] Figure 26 Schematic diagram of step 8 in the second construction method of the embodiment of the present application;

[0079] Figure 27 Schematic diagram of step 9 in the second construction method of the embodiment of the present application;

[0080] Figure 28 Schematic diagram of step 10 in the second construction method of the embodiment of the present application;

[0081] Figure 29 Schematic diagram of step 11 in the second construction method of the embodiment of the present application;

[0082] Figure 30 Schematic diagram of step 12 in the second construction method of the embodiment of the present application;

[0083] Figure 31 It is a schematic structural diagram of step 13 in the second construction method of the embodiment of the present application;

[0084] Figure 32 It is a schematic structural diagram of step 14 in the second construction method of the embodiment of the present application;

[0085] Figure 33 It is a schematic structural diagram of step 15 in the second construction method of the embodiment of the present application;

[0086] Figure 34 It is a schematic structural diagram of step 16 in the second construction method of the embodiment of the present application;

[0087] Figure 35 It is a schematic structural diagram of step 17 in the second construction method of the embodiment of the present application;

[0088] Figure 36 It is a schematic structural diagram of step 18 in the second construction method of the embodiment of the present application.

[0089] Reference signs:

[0090] 1, front girder carrier; 2, rear girder carrier; 3, front auxiliary outrigger; 4, front outrigger; 5, main girder; 6, front crane; 7, rear crane; 8, middle outrigger; 9, rear outrigger; 10, power system; 11, front conversion support; 12, rear conversion support;

[0091] 81, hanging frame; 82, upper crossbeam; 83, traversing oil cylinder; 84, lower support traveling mechanism; 85, telescopic support; 86, lower crossbeam; 87, driving mechanism; 88, upper support traveling mechanism; 111, support column; 112, girder carrier; 113, support; 114, rubber pad; 115, lifting oil cylinder; 116, pin; 117, oil cylinder base. Detailed implementation manners

[0092] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0093] The embodiments of the present application provide a single-main-girder ultra-low double-span girder erection construction equipment and construction method, which can solve the problem that the single-main-girder bridge erecting machine in the related art is difficult to meet the girder erection construction in an environment with limited width and height.

[0094] See Figure 1 andFigure 2 As shown in Figure 2 , in the first aspect of the embodiments of the present application, a single-girder ultra-low double-span beam erection construction equipment is provided, including:

[0095] A bridge girder erection machine, which includes a main girder 5. The main girder 5 is a single main girder, and a front support leg 4, a middle support leg 8, and a rear support leg 9 are sequentially connected to the main girder 5 from front to back. Both the front support leg 4 and the middle support leg 8 can change their own heights through telescoping, and can reciprocate back and forth along the length direction of the main girder 5. A front crane 6 and a rear crane 7 for lifting box girders are also connected to the main girder 5. The front crane 6 and the rear crane 7 are used to lift the box girders transported by the beam transporter to the designated position.

[0096] The height of the middle support leg 8 is telescopic and its width is less than the width of the box girder. The telescopic height of the middle support leg 8 can not only adjust the support height of the main girder 5, but also avoid the box girder transported by the transport vehicle by contracting and lowering its own height. The width of the middle support leg 8 is less than the width of the box girder, so that the middle support leg 8 is located within the width range of the box girder to be erected, thereby avoiding position interference with surrounding structures due to over-width and preventing normal beam erection.

[0097] A beam transporter, which includes a front beam transporter 1 and a rear beam transporter 2 for transporting box girders. The front beam transporter 1 and the rear beam transporter 2 are used to jointly transport the box girder to be erected to the beam erection station where the bridge girder erection machine is located. The front beam transporter 1 and the rear beam transporter 2 cooperate with each other to jointly carry and transport the box girder, and transport the box girder from the box girder prefabrication yard to the beam erection station where the bridge girder erection machine is located.

[0098] A conversion support, which includes a front conversion support 11 and a rear conversion support 12 for converting and supporting the box girder to be erected transported by the front beam transporter 1 and the rear beam transporter 2 above the erected box girder or the bridge deck. The front conversion support 11 and the rear conversion support 12 can lift the box girder to be erected for lifting movement. After converting the box girder to be erected transported by the front beam transporter 1 and the rear beam transporter 2 to the front conversion support 11 and the rear conversion support 12, the ground clearance of the box girder to be erected can be further reduced to cooperate with the ultra-low beam erection of the beam erection machine.

[0099] The single-girder ultra-low double-span beam erection construction equipment of the embodiments of the present application designs a middle support leg 8 with a telescopic height and a width less than the width of the box girder for special working conditions of the line. The middle support leg 8 is designed to have an overall width less than the width of the box girder, and the ultra-low height requirement of the middle support leg 8 can be realized through telescoping in the height direction. Finally, it can meet the requirement that the lower part of the middle support leg 8 crosses the beam surface, the upper part passes through the limited-height portal pier, and finally supports on the rear beam transporter 2 or the bridge deck.

[0100] The conversion support in the embodiments of the present application includes a front conversion support 11 and a rear conversion support 12 that convert and support the box girder to be erected transported by the front girder carrier 1 and the rear girder carrier 2 above the erected box girder. When encountering special extremely low clearance working conditions, the box girder on the girder carrier is converted to the front conversion support 11 and the rear conversion support 12, further reducing the height of the box girder, so that the bridge erecting machine can erect the box girder under a lower limit position.

[0101] In some alternative embodiments: Refer to Figure 3 and Figure 4 As shown in and, the embodiments of the present application provide a single-girder ultra-low double-span beam erection construction equipment. The middle support leg 8 of the equipment includes a frame assembly and a hanging assembly connected to each other. The frame assembly includes an upper cross beam 82 located at the top of the main girder 5, a lower cross beam 86 located at the bottom of the main girder 5, and a telescopic support column 85 connected between the upper cross beam 82 and the lower cross beam 86. The height between the upper cross beam 82 and the lower cross beam 86 can be adjusted by adjusting the height of the telescopic support column 85 itself.

[0102] The hanging assembly includes a hanging frame 81 that is horizontally slidably connected to the upper cross beam 82 and partially overlaps in the height direction. The partial overlap of the hanging frame 81 and the upper cross beam 82 in the height direction can further reduce the space height of the middle support leg 8. A transverse movement oil cylinder 83 for pushing the hanging frame 81 to move horizontally is provided between the hanging frame 81 and the upper cross beam 82. The transverse movement oil cylinder 83 pushes the hanging frame 81 to move horizontally relative to the upper cross beam 82, and the curved erection of the box girder can be realized. The hanging frame 81 is connected to the main girder 5 through a lower support traveling mechanism 84 and an upper support traveling mechanism 88 and longitudinally moves relative to the main girder 5.

[0103] Upper flange plates and lower flange plates extending along the length direction of the main girder 5 are respectively provided on both sides of the main girder 5. The lower support traveling mechanism 84 is supported on the top surface of the lower flange plate, and the lower support traveling mechanism 84 is used to hang the middle support leg 8 to longitudinally move on the main girder 5. The upper support traveling mechanism 88 is supported on the bottom surface of the upper flange plate, and the upper support traveling mechanism 88 is used to vertically support the main girder 5, so that the main girder 5 longitudinally moves on the middle support leg 8. Driving mechanisms 87 for driving the middle support leg 8 to longitudinally move relative to the main girder 5 are respectively provided on both sides of the hanging frame 81.

[0104] In some alternative embodiments: Refer to Figure 5 and Figure 6 As shown in and, the embodiments of the present application provide a single-girder ultra-low double-span beam erection construction equipment. The front conversion support 11 and the rear conversion support 12 of the equipment have the same structure, and both include a beam carrying frame 112 for lifting the box girder to be erected, and support columns 111 slidably connected to both ends of the beam carrying frame 112. There is a support 113 at the bottom of the support column 111, and a lifting oil cylinder 115 for driving the beam carrying frame 112 to move up and down along the height direction of the support column 111 is provided on the support 113. The bottom of the lifting oil cylinder 115 is fixed on the support 113 through an oil cylinder base 117.

[0105] The front conversion support 11 and the rear conversion support 12 are respectively connected to the front girder carrier 1 and the rear girder carrier 2. At least two positioning holes are arranged on the support column 111 in sequence from bottom to top, and a pin 116 for supporting the height of the positioning beam carrier 112 is inserted into the positioning holes. The positioning hole at the bottom of the support column 111 is used to position the beam carrier 112 at the lowest ground clearance position, and the positioning hole at the top of the support column 111 is used to position the beam carrier 112 at the highest ground clearance position. A rubber pad 114 for leveling and cushioning the box girder to be erected is arranged on the top of the beam carrier 112, and the rubber pad 114 is used to protect the box girder to be erected and prevent bottom bumps.

[0106] In some alternative embodiments: Refer to Figure 1 and Figure 2 As shown, the embodiment of the present application provides a single-girder ultra-low double-span beam erection construction equipment. The bridge erecting machine of the equipment further includes a front auxiliary support leg 3 located in front of the front support leg 4 and moving along the length direction of the main girder 5, and the front auxiliary support leg 3 is used to assist the bridge erecting machine in passing through the hole. The top of the rear support leg 9 is hinged to the tail end of the main girder 5 through a rotating shaft. Before the girder carrier transports the box girder to be erected under the main girder 5, the rear support leg 9 is turned upwards to provide space for the girder carrier to feed the beam.

[0107] A front beam carrier trolley and a rear beam carrier trolley are respectively slidably connected to the front girder carrier 1 and the rear girder carrier 2. The front beam carrier trolley and the rear beam carrier trolley are respectively slidably connected to the front girder carrier 1 and the rear girder carrier 2. The front beam carrier trolley and the rear beam carrier trolley are driven to slide through a winch or a jacking oil cylinder, and thus the position of the box girder relative to the front girder carrier 1 and the rear girder carrier 2 can be adjusted, facilitating on-site adjustment of the lifting position of the box girder. A power system 10 is further arranged at the rear end of the main girder 5, and the power system 10 can be used for power generation, providing a pneumatic source or a hydraulic source.

[0108] The second aspect of the embodiment of the present application provides a single-girder ultra-low double-span beam erection construction method. The method uses the single-girder ultra-low double-span beam erection construction equipment described in any of the above embodiments, and the method includes:

[0109] Step 1, Refer to Figure 7 As shown, the main girder 5 is supported by the front support leg 4 and the middle support leg 8, the rear support leg 9 is turned upwards, the girder carrier transports the box girder into the bottom of the bridge erecting machine, and the rear girder carrier 2 transports the box girder in place.

[0110] Step 2, Refer to Figure 8 As shown, the rear support leg 9 is turned downwards and supported on the rear girder carrier 2, the height of the rear girder carrier 2 is reduced, and the middle support leg 8 retracts and retreats to a specified position away from the rear support leg 9 and stops.

[0111] Step 3, Refer to Figure 9As shown in the figure, the front crane 6 and the rear crane 7 reverse to the beam-taking position above the front girder carrier 1. The front crane 6 and the rear girder carrier 2 synchronously drag the box girder forward to make way for the support position of the middle support leg 8.

[0112] Step 4, Refer to Figure 10 As shown in the figure, after the middle support leg 8 extends, it stands on the rear girder carrier 2 and switches the support with the rear support leg 9. After the middle support leg 8 extends and is in place, the rear crane 7 reverses to the rear beam-taking position to take the beam.

[0113] Step 5, Refer to Figure 11 As shown in the figure, after the front crane 6 and the rear crane 7 lift the box girder and move forward to the in-place position, the front crane 6 and the rear crane 7 align the box girder with the bridge pier and then lower the beam to complete the erection of the current box girder hole.

[0114] Step 6, Refer to Figure 12 As shown in the figure, after the box girder is lowered in place, the front support leg 4 is anchored to the box girder. The front support leg 4 and the rear support leg 9 support the main girder 5. The middle support leg 8 shortens and moves forward longitudinally in a suspended state to the position for passing the hole to support the main girder 5. Then the rear support leg 9 is suspended to prepare for passing the hole.

[0115] Step 7, Refer to Figure 13 As shown in the figure, the front support leg 4 and the middle support leg 8 drive the main girder 5 to move forward longitudinally to the in-place position. The front auxiliary support leg 3 synchronously retreats. The front crane 6 and the rear crane 7 synchronously retreat to the vicinity of the middle support leg 8.

[0116] Step 8, Refer to Figure 14 As shown in the figure, after the front auxiliary support leg 3 moves forward to the center position of the front pier, it supports the main girder 5.

[0117] Step 9, Refer to Figure 15 As shown in the figure, the rear support leg 9, the front support leg 4 and the front auxiliary support leg 3 support the main girder 5. The middle support leg 8 retracts from the ground. The front crane 6 and the rear crane 7 move forward with the middle support leg 8 to the rear of the front support leg 4.

[0118] Step 10, Refer to Figure 16 As shown in the figure, after the middle support leg 8 extends to support the main girder 5, the anchorage of the front support leg 4 to the box girder is released. The front support leg 4 longitudinally moves to the designated position of the front pier and then supports the main girder 5. The front auxiliary support leg 3 retracts and is suspended, and longitudinally moves forward to the designated position.

[0119] Step 11, Refer to Figure 17 As shown in the figure, the front crane 6 and the rear crane 7 longitudinally move forward to the rear of the front support leg 4. After the middle support leg 8 retracts, it longitudinally moves forward again by a specified distance to the position at a specified distance from the beam end and then supports the main girder 5.

[0120] Step 12, Refer to Figure 18 As shown in the figure, the bridge erecting machine is lifted to the beam erection height, and the rear support leg 9 is turned up to complete the passing of the bridge erecting machine through the hole and prepare for the erection of the next box girder.

[0121] In the third aspect of the embodiments of the present application, a construction method for a single-girder ultra-low double-span beam erection is provided. The method uses the single-girder ultra-low double-span beam erection construction equipment described in any of the above embodiments. The method includes:

[0122] Step 1. Refer to Figure 19 As shown, adjust the support height of the beam erection machine according to the height of the underpass structure (such as a portal pier or a pre-erected bridge). Flip the rear support leg 9 upward. The beam transport vehicle transports the box girder into the bottom of the bridge erection machine, and lower the oil cylinder support legs of the front beam transport vehicle 1.

[0123] Step 2. Refer to Figure 20 As shown, after the rear support leg 9 is flipped downward and supported on the bridge deck, the rear beam transport vehicle 2 pushes the box girder forward to the in-place position. The front support leg 4, the middle support leg 8, and the rear support leg 9 alternately descend to make the upper surface of the main girder 5 of the bridge erection machine at a set distance from the bottom surface of the structure.

[0124] Step 3. Refer to Figure 21 As shown, the middle support leg 8 contracts and moves forward to the designated position. The front conversion support 11 and the front beam transport vehicle 1 are converted for support. The box girder is separated from the front beam transport vehicle 1 and supported on the front conversion support 11.

[0125] Step 4. Refer to Figure 22 As shown, the front beam transport vehicle 1 moves forward to the beam end, stops and lowers the oil cylinder support legs, drives the front beam carrier trolley backward to the support position, and converts the box girder on the front conversion support 11 to the front beam carrier trolley.

[0126] Step 5. Refer to Figure 23 As shown, the rear beam transport vehicle 2 pushes the front beam carrier trolley to synchronously feed the beam to the in-place position, and the front conversion support 11 runs to the in-place position synchronously.

[0127] Step 6. Refer to Figure 24 As shown, the front conversion support 11 and the rear conversion support 12 synchronously lift the box girder to separate it from the front beam carrier trolley and the rear beam carrier trolley, and the front beam transport vehicle 1 and the rear beam transport vehicle 2 withdraw.

[0128] Step 7. Refer to Figure 25 As shown, the front conversion support and the rear conversion support are lowered to the lowest position, and the front support leg and the rear support leg alternately lift the main girder to the beam erection height to provide space for the middle support leg to retreat.

[0129] Step 8. Refer to Figure 26 As shown, after the middle support leg 8 retreats a specified distance and reaches the beam erection position, the middle support leg 8 extends and is supported on the bridge deck. The front crane 6 and the rear crane 7 synchronously retreat to the beam fetching position to prepare for fetching the box girder.

[0130] Step 9. Refer to Figure 27As shown, the front crane 6 and the rear crane 7 lift and longitudinally move the box girder forward to reach the beam-lowering position. The front support leg 4 and the middle support leg 8 laterally move the main girder 5 to align and accurately lower the beam, completing the erection of the current box girder span.

[0131] Step 10, refer to Figure 28 As shown, after the box girder is lowered in place, the front support leg 4 is anchored to the box girder. The bridge erecting machine is lowered to a set distance between the upper surface of the main girder 5 and the bottom surface of the structure. After the rear crane 7 lifts the front conversion support 11 and retreats to the designated position, the rear crane 7 releases the hook and returns.

[0132] Step 11, refer to Figure 29 As shown, the rear crane 7 travels to the rear of the front crane 6. The front support leg 4 and the rear support leg 9 support the main girder 5. The middle support leg 8 retracts and suspends, then longitudinally moves forward to the through-hole support position for support.

[0133] Step 12, refer to Figure 30 As shown, the rear support leg 9 flips upward. The front beam carrier 1 and the rear beam carrier 2 enter the tail of the bridge erecting machine, lift the front conversion support 11 and the rear conversion support 12, and then exit.

[0134] Step 13, refer to Figure 31 As shown, the front support leg 4 and the middle support leg 8 drive the main girder 5 to longitudinally move forward in place. At the same time, the front crane 6 and the rear crane 7 retreat to near the middle support leg 8.

[0135] Step 14, refer to Figure 32 As shown, the front auxiliary support leg 3 moves forward to the center position of the front pier and then supports the main girder 5.

[0136] Step 15, refer to Figure 33 As shown, the rear support leg 9 flips downward to support on the bridge deck. The middle support leg 8 retracts from the ground. The front crane 6 and the rear crane 7 and the middle support leg 8 move forward to the rear of the front support leg 4.

[0137] Step 16, refer to Figure 34 As shown, after the middle support leg 8 extends to support the main girder 5, the anchoring of the front support leg 4 to the box girder is released. The front support leg 4 longitudinally moves to the designated position of the front pier and then supports the main girder 5. The front auxiliary support leg 3 retracts and suspends, and longitudinally moves forward to the designated position.

[0138] Step 17, refer to Figure 35 As shown, the front crane 6 and the rear crane 7 longitudinally move forward to the rear of the front support leg 4. The middle support leg 8 retracts and then longitudinally moves forward again by a specified distance from the beam end and reaches the position to support the main girder 5.

[0139] Step 18, refer to Figure 36 As shown, the bridge erecting machine is lifted to the beam erection height. The rear support leg 9 flips upward. The bridge erecting machine completes the through-hole and prepares for the erection of the next box girder.

[0140] Working principle

[0141] An embodiment of the present application provides a single-girder ultra-low double-span beam erection construction equipment and a construction method. Since the single-girder ultra-low double-span beam erection construction equipment of the present application is provided with a bridge girder erection machine, the bridge girder erection machine includes a main girder 5, a front support leg 4, a middle support leg 8, and a rear support leg 9 that are sequentially connected to the main girder 5 from front to back. The main girder 5 is also connected with a front crane 6 and a rear crane 7 for lifting box girders. The height of the middle support leg 8 is telescopic and its width is smaller than the width of the box girder; a beam transporter, the beam transporter includes a front beam transporter 1 and a rear beam transporter 2 for transporting box girders. The front beam transporter 1 and the rear beam transporter 2 are used to jointly transport the box girder to be erected to the beam erection work station where the bridge girder erection machine is located; a conversion support, the conversion support includes a front conversion support 11 and a rear conversion support 12 that convert and support the box girder to be erected transported by the front beam transporter 1 and the rear beam transporter 2 above the erected box girder. The front conversion support 11 and the rear conversion support 12 can lift the box girder to be erected for lifting movement.

[0142] Therefore, the single-girder ultra-low double-span beam erection construction equipment of the present application designs a middle support leg 8 with a telescopic height and a width smaller than the width of the box girder for special working conditions of the line. The middle support leg 8 is designed to have an overall width smaller than the width of the box girder, and the ultra-low height requirement of the middle support leg 8 can be realized by telescoping in the height direction. Finally, it can meet the requirement that the lower part of the middle support leg 8 crosses the beam surface and the upper part passes through the limited-height portal pier, and finally supports on the rear beam transporter 2 or the bridge deck. The conversion support includes a front conversion support 11 and a rear conversion support 12 that convert and support the box girder to be erected transported by the front beam transporter 1 and the rear beam transporter 2 above the erected box girder. When encountering special extremely low-limitation working conditions, the box girder on the beam transporter is converted to the front conversion support 11 and the rear conversion support 12, further reducing the ground clearance of the box girder, so that the bridge girder erection machine can successfully erect the box girder under a lower limit position.

[0143] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0144] It should be noted that in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0145] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A single main beam ultra-low position double span beam erection construction method, characterized in that: Single main beam ultra-low position double span beam erection construction equipment includes: A bridge erecting machine, the bridge erecting machine comprising a main beam (5), a front auxiliary support leg (3), a front support leg (4), a middle support leg (8) and a rear support leg (9) connected to the main beam (5) in sequence from front to rear, the main beam (5) also being connected to a front crane (6) and a rear crane (7) for lifting a box beam, the middle support leg (8) being retractable in height and having a width smaller than the width of the box beam; A beam transport vehicle, the beam transport vehicle comprising a front beam transport vehicle (1) and a rear beam transport vehicle (2) for transporting box beams, the front beam transport vehicle (1) and the rear beam transport vehicle (2) being used to jointly transport the box beam to be erected to a bridge erection station where a bridge erection machine is located; A conversion support, the conversion support comprising a front conversion support (11) and a rear conversion support (12) for converting the box beam to be erected, which is transported by the front beam transport vehicle (1) and the rear beam transport vehicle (2), to a position above the erected box beam, wherein the front conversion support (11) and the rear conversion support (12) can lift the box beam to be erected for lifting and lowering movements; The method comprises: The main beam (5) is supported by the front supporting legs (4) and the middle supporting legs (8), the rear supporting legs (9) are turned upward, the beam transport vehicle transports the box beam into the bottom of the bridge erecting machine, and the rear beam transport vehicle (2) transports the box beam to the desired position; The rear outrigger (9) turns downward and is supported on the rear beam transport vehicle (2), and the middle outrigger (8) retracts and retreats to a designated position away from the rear outrigger (9) and stops; The front crane (6) and the rear crane (7) retreat to the beam-removing position above the front beam-transporting vehicle (1), and the front crane (6) and the rear beam-transporting vehicle (2) synchronously drag the box beam forward and make way for the support position of the middle support leg (8); After the middle outrigger (8) is extended, it stands on the rear beam transport vehicle (2) and switches support with the rear outrigger (9). After the middle outrigger (8) is extended and supported in place, the rear lifting vehicle (7) retreats to the rear beam taking position to take the beam; The front crane (6) and the rear crane (7) lift the box girder and move forward to the position. The front crane (6) and the rear crane (7) align the box girder with the bridge pier and then drop the girder.

2. A single main beam ultra-low position double span beam erection construction method as claimed in claim 1, characterized in that: The method further comprises: After the box beam is lowered into place, the front legs (4) are anchored on the box beam, the front legs (4) and the rear legs (9) support the main beam (5), the middle legs (8) are shortened and suspended in the air and moved forward to the through-hole position to support the main beam (5), and then the rear legs (9) are suspended in the air to prepare for the through-hole; The front outrigger (4) and the middle outrigger (8) drive the main beam (5) to move forward longitudinally to a position, the front auxiliary outrigger (3) moves backward synchronously, and the front crane (6) and the rear crane (7) move backward synchronously to the vicinity of the position of the middle outrigger (8); The front auxiliary support leg (3) moves forward to the center of the front pier and then supports the main beam (5); The rear outriggers (9), the front outriggers (4) and the front auxiliary outriggers (3) support the main beam (5), the middle outriggers (8) are retracted off the ground, and the front crane (6) and the rear crane (7) and the middle outriggers (8) move forward to the rear of the front outriggers (4); After the middle outrigger (8) is extended to support the main beam (5), the anchoring of the front outrigger (4) and the box beam is released, the front outrigger (4) is longitudinally moved to a designated position of the front pier and then supports the main beam (5), and the front auxiliary outrigger (3) is retracted and suspended in the air and longitudinally moved forward to a designated position; The front crane (6) and the rear crane (7) move forward longitudinally to the rear of the front outrigger (4), and the middle outrigger (8) retracts and moves forward longitudinally again to a specified distance from the beam end to support the main beam (5); The top of the bridge erecting machine is raised to the beam erection height, and the rear legs (9) are turned upwards to prepare for the erection of the next box beam.

3. A single main beam ultra-low position double span beam erection construction method, characterized in that: Single main beam ultra-low position double span beam erection construction equipment includes: A bridge erecting machine, the bridge erecting machine comprising a main beam (5), a front auxiliary support leg (3), a front support leg (4), a middle support leg (8) and a rear support leg (9) connected to the main beam (5) in sequence from front to rear, the main beam (5) also being connected to a front crane (6) and a rear crane (7) for lifting a box beam, the middle support leg (8) being retractable in height and having a width smaller than the width of the box beam; A beam transport vehicle, the beam transport vehicle comprising a front beam transport vehicle (1) and a rear beam transport vehicle (2) for transporting box beams, the front beam transport vehicle (1) and the rear beam transport vehicle (2) being used to jointly transport the box beam to be erected to a bridge erection station where a bridge erection machine is located; A conversion support, the conversion support comprising a front conversion support (11) and a rear conversion support (12) for converting the box beam to be erected, which is transported by the front beam transport vehicle (1) and the rear beam transport vehicle (2), to a position above the erected box beam, wherein the front conversion support (11) and the rear conversion support (12) can lift the box beam to be erected for lifting and lowering movements; The method comprises: The supporting height of the bridge erecting machine is adjusted according to the height of the structure passing below, the rear support leg (9) is turned upward, the beam transport vehicle transports the box beam into the bottom of the bridge erecting machine, and the oil cylinder support leg of the front beam transport vehicle (1) is lowered; The rear outrigger (9) is flipped downward and supported on the bridge deck, the rear beam transport vehicle (2) pushes the box beam forward to move into position, and the front outrigger (4), the middle outrigger (8) and the rear outrigger (9) are alternately lowered so that the upper surface of the main beam (5) of the bridge erecting machine is at a set distance from the bottom surface of the structure; The middle support leg (8) is retracted and moves forward to a specified position, the front transfer support (11) and the front beam transport vehicle (1) transfer support, the box beam is separated from the front beam transport vehicle (1) and supported on the front transfer support (11); The front beam transport vehicle (1) moves forward to the beam end, stops and lowers the oil cylinder legs, drives the front beam carrying trolley backward to the supporting position, and transfers the box beam on the front transfer support (11) to the front beam carrying trolley; The rear beam transport vehicle (2) pushes the front beam carrying trolley to synchronously feed the beam into position, and the front conversion support (11) synchronously moves into position; The front conversion support (11) and the rear conversion support (12) synchronously lift the box beam to separate from the front beam-carrying trolley and the rear beam-carrying trolley, and the front beam-carrying trolley (1) and the rear beam-carrying trolley (2) withdraw; The front conversion support (11) and the rear conversion support (12) are lowered to the lowest position, and the front legs (4) and the rear legs (9) alternately lift the main beam (5) to the beam erection height, thereby providing space for the middle legs (8) to retreat; After the middle outrigger (8) retreats a specified distance, it reaches the beam erection position, the middle outrigger (8) is extended and supported on the bridge deck, and the front crane (6) and the rear crane (7) synchronously retreat to the beam removal position, ready to lift the box beam; The front crane (6) and the rear crane (7) lift the box beam and move it longitudinally forward to the beam drop position, and the front support leg (4) and the middle support leg (8) move the main beam (5) transversely to the position and drop the beam accurately.

4. A single main beam ultra-low position double span beam erection construction method as claimed in claim 3, characterized in that: The method further comprises: After the box girder falls into place, the front outrigger (4) is anchored on the box girder, and the bridge erection machine is lowered until the upper surface of the main girder (5) is at a set distance from the bottom surface of the structure, and the rear crane (7) lifts the front conversion support (11) and moves backward to the designated position, and then the rear crane (7) retracts the hook and returns; The rear crane (7) moves to the rear of the front crane (6), the front outriggers (4) and the rear outriggers (9) support the main beam (5), and the middle outriggers (8) are retracted and suspended in the air and then longitudinally moved forward to the through-hole support position for support; The rear outrigger (9) turns upward, and the front beam transport vehicle (1) and the rear beam transport vehicle (2) enter the rear of the bridge erecting machine, pick up the front conversion support (11) and the rear conversion support (12), and then exit; The front outrigger (4) and the middle outrigger (8) drive the main beam (5) to move forward longitudinally to a position, the front auxiliary outrigger (3) moves backward synchronously, and at the same time, the front crane (6) and the rear crane (7) move backward to the vicinity of the middle outrigger (8); The front auxiliary support leg (3) moves forward to the center of the front pier and then supports the main beam (5); The rear outrigger (9) is turned downward to be supported on the bridge deck, the middle outrigger (8) is retracted off the ground, and the front crane (6) and the rear crane (7) and the middle outrigger (8) are moved forward to the rear of the front outrigger (4); After the middle outrigger (8) is extended to support the main beam (5), the anchoring of the front outrigger (4) and the box beam is released, the front outrigger (4) is longitudinally moved to a designated position of the front pier and then supports the main beam (5), and the front auxiliary outrigger (3) is retracted and suspended in the air and longitudinally moved forward to a designated position; The front crane (6) and the rear crane (7) move forward longitudinally to the rear of the front outrigger (4), and the middle outrigger (8) retracts and moves forward longitudinally again to a specified distance from the beam end to support the main beam (5); The top of the bridge erecting machine is raised to the beam erection height, and the rear legs (9) are turned upwards to prepare for the erection of the next box beam.

5. A single main beam ultra-low position double span beam erection construction method as claimed in claim 1 or 3, characterized in that: The middle leg (8) comprises a frame assembly and a suspension assembly connected to each other, the frame assembly comprising an upper crossbeam (82) located at the top of the main beam (5), a lower crossbeam (86) located at the bottom of the main beam (5), and a telescopic support (85) connected between the upper crossbeam (82) and the lower crossbeam (86); The hanging assembly comprises a hanging frame (81) which is slidably connected to the upper cross beam (82) in a transverse direction and partially overlaps with the upper cross beam (82) in a height direction; the hanging frame (81) is connected to the main beam (5) via a lower support running mechanism (84) and an upper support running mechanism (88) and moves longitudinally relative to the main beam (5).

6. A single main beam ultra-low position double span beam erection construction method as claimed in claim 5, characterized in that: An upper flange plate and a lower flange plate extending along the length direction of the main beam (5) are respectively provided on both sides of the main beam (5); the lower support running mechanism (84) is supported on the top surface of the lower flange plate; the upper support running mechanism (88) is supported on the bottom surface of the upper flange plate; and a driving mechanism (87) for driving the middle support leg (8) to move longitudinally relative to the main beam (5) is respectively provided on both sides of the hanging frame (81).

7. A single main beam ultra-low position double span beam erection construction method as claimed in claim 1 or 3, characterized in that: The front conversion support (11) and the rear conversion support (12) both include a beam support frame (112) for supporting the box beam to be erected, and support columns (111) slidably connected to both ends of the beam support frame (112), a support (113) being provided at the bottom of the support column (111), and a lifting cylinder (115) being provided on the support (113) for driving the beam support frame (112) to move up and down along the height direction of the support column (111).

8. A single main beam ultra-low position double span beam erection construction method as claimed in claim 7, characterized in that: The front conversion support (11) and the rear conversion support (12) are detachably connected to the front beam transport vehicle (1) and the rear beam transport vehicle (2), respectively; the support column (111) is provided with a plurality of positioning holes arranged in sequence from bottom to top; the positioning holes are penetrated by latches (116) for positioning the support height of the beam carrier frame (112); and the top of the beam carrier frame (112) is provided with a rubber pad (114) for padding the box beam to be mounted.

9. A single main beam ultra-low position double span beam erection construction method as claimed in claim 1 or 3, characterized in that: The top of the rear support leg (9) is hinged to the tail end of the main beam (5) via a rotating shaft. When the beam transport vehicle transports the box beam to be erected and enters below the main beam (5), the rear support leg (9) flips upward, and the front beam transport vehicle (1) and the rear beam transport vehicle (2) are respectively slidably connected to a front beam-carrying trolley and a rear beam-carrying trolley.

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