Synchronous span-crossing type steel box girder pushing erection equipment and erection method

Abstract

The invention discloses synchronous crossing type steel box girder pushing erection equipment and an erection method.The synchronous crossing type steel box girder pushing erection equipment comprises a bridge girder erection machine girder, a supporting leg system, a connecting mechanism and a pushing system, the supporting leg system comprises a foundation supporting leg and a movable supporting leg, and the pushing system comprises a first pushing support, a second pushing support and a self-walking pushing system; the steel box girder sections and the girder of the bridge girder erection machine are quickly and temporarily locked and connected through the connecting pieces, then the first pushing support and the second pushing support are arranged on the bridge deck to push the girder, the second pushing support is low, the steel box girder sections on the girder can conveniently pass through the second pushing support, and therefore the first pushing support and the second pushing support can directly run and turn over on the bridge deck; the main beam drives the steel box beam sections to move synchronously when crossing, after the main beam is pushed in place, the length of the movable supporting legs can be adjusted in a telescopic mode, the self-walking pushing system slides forwards to walk for crossing, a traditional support structure does not need to be temporarily mounted and dismounted, the steel box beam erecting construction efficiency is improved, the support measure quantity is reduced, and economic benefits are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering. More specifically, the present invention relates to a synchronous over-span steel box girder jacking erection equipment and an erection method. Background Art

[0002] With the rapid development of the economic society, the reconstruction and expansion in the field of bridge engineering have gradually replaced the new construction business and become the popular and mainstream trend in the industry. Compared with new construction, bridge reconstruction and expansion have the characteristics of more boundary conditions, more limiting factors, more complex surrounding environment, and higher requirements for traffic maintenance. Bridge reconstruction and expansion generally include methods such as planar expansion and three-dimensional expansion. When there is no available land around the existing bridge or the demolition is difficult and costly, the three-dimensional expansion method is preferred. Patent (CN115821793A) discloses a single-span beam-mounted walking jacking erection process with a counter beam structure, including steps such as installing the jacking erection equipment, transporting the main beam to be installed onto the installed bridge, folding or retracting the legs, lifting the main beam to be installed by the beam transporter and temporarily connecting it to the counter beam, and jacking. It can adapt to the situation where the steel box girder has a large volume, a large self-weight, irregular changes in beam width, the width projection range of the steel box girder covers the highway lane, and the erection of the floor brackets is very limited. For the existing construction process, since the segmented position of the jacked steel box girder is directly above the pier, there is no working space for the circumferential welding at the pier top position of the steel box girder bridge. Therefore, generally, the segmented position of the steel box girder needs to exceed the main pier and be offset by a certain distance, resulting in that the corresponding leg structure cannot support on the pier. At the same time, the jacking erection equipment supporting its process needs to continuously turnover the rear jacking support and the front jacking support. For each span of steel box girder jacking installation, a total of three sets of jacking supports, namely the rear jacking support, the front jacking support, and the rear-span jacking support, are required. These all belong to temporary structures. If a large number of bridge jacking operations are required, the consumption of temporary measure materials is large, and a large amount of manpower and material resources are required for turnover, resulting in high costs. Moreover, the existing front jacking support needs to be lowered before the steel box girder is lowered. In actual implementation, due to the steel box girder cover on the top and its own large weight, the operation is difficult, it cannot quickly adapt to the change in erection height, and the temporary quick connection method between the main beam and the counter beam is not clear, etc., resulting in a large turnover volume of the jacking support, affecting the construction efficiency, and restricting its further popularization and application value. Summary of the Invention

[0003] An object of the present invention is to solve at least the above problems and provide at least the advantages described later.

[0004] Another object of the present invention is to provide a synchronous over-span steel box girder jacking erection equipment and an erection method to solve the technical problems of difficult setting and difficult turnover of the jacking support during the jacking construction of the steel box girder segment in the prior art.

[0005] To achieve these objects and other advantages according to the present invention, on the one hand, the present invention provides a synchronous over-crossing steel box girder pushing and erection equipment, including: A main girder, which extends along the girder erection direction, and a lowering system for lifting and lowering the steel box girder segment directly below is provided in the middle of the main girder. A heightening block equal in height to the steel box girder segment is connected downward at the rear side of the lifted steel box girder segment of the main girder; A leg system, which includes a plurality of foundation legs arranged in sequence along the girder erection direction at the bottom of the main girder and a moving leg slidably connected along the longitudinal bridge direction at the bottom of the front end of the main girder. The moving leg can be rotated forward relative to the main girder to a horizontal state and hung on the main girder. The moving leg can be telescoped in the length direction, and the lower end supports at the front end of the bearing platform in the vertical state; A connecting mechanism, which includes a connecting piece provided in the middle of the main girder and a leg foundation structure provided on the bearing platform. The connecting piece is used for locking and connecting with the steel box girder segment directly below, and the leg foundation structure is used for detachably and fixedly connecting with the bottom of the moving leg in the vertical state; A pushing system, which includes a self-propelled pushing system provided between the upper ends of the main girder and the moving leg and a first pushing support and a second pushing support arranged in sequence along the girder erection direction on the already installed steel box girder segments. The self-propelled pushing system is used to cause relative movement between the moving leg and the main girder. The first pushing support is used to push the main girder along the bridge erection direction, and the second pushing support is used to push the steel box girder segment and the heightening block along the bridge erection direction.

[0006] Preferably, the foundation legs include a first leg, a second leg, a third leg, a fourth leg, and a fifth leg that are arranged at intervals in sequence along the bridge erection direction and can be retracted and extended. The first leg, the second leg, and the third leg are used to support on the already installed bridge, and the fourth leg and the fifth leg are used to support on the pier top. The connecting piece is located between the third leg and the fourth leg.

[0007] Preferably, the moving leg includes a standard section, a standard adjustment section, a telescopic section, an adjustment oil cylinder, and a screw jack that are connected and arranged in sequence from top to bottom. The upper end of the standard section is connected to the self-propelled pushing system. The number of standard adjustment sections ≥ 0. The sum of the length adjustments of the standard adjustment section and the telescopic section to the moving leg is not less than 10 m. The telescopic section is a matching structure of an outer rod sleeving an inner rod, and the length of the inner rod sleeved into the outer rod is driven by the expansion and contraction of the adjustment oil cylinder. The relative position between the inner rod and the outer rod is fixed by a support pin shaft. The bottom of the screw jack is detachably and fixedly connected to the leg foundation structure.

[0008] Preferably, the self - propelled pushing system includes a base which is slidably connected to the bottom of the main girder. A traveling oil cylinder is connected to the rear side of the base on the main girder for driving the base to move back and forth. On the bottom of the base and the top of the standard segment, outer ear plates and inner ear plates are arranged symmetrically and successively along the beam erection direction. A first rotating pin shaft is detachably passed through between the symmetric outer ear plates, and a second rotating pin shaft is detachably passed through between the symmetric inner ear plates. By passing through the first rotating pin shaft and the second rotating pin shaft, the base and the standard segment are temporarily connected as a whole. A conversion oil cylinder is connected downward in the middle of the base to push the standard segment downward. A winch and a hanging wheel are slidably arranged at the front end of the base on the bottom plate of the main girder. The traction end of the winch is detachably connected to the lower end of the movable support leg for lifting the movable support leg to a horizontal state, and the hanging wheel is used for hanging the lower end of the movable support leg in the horizontal state.

[0009] Preferably, the cross - sectional dimension of the front end of the main girder gradually decreases forward at the front end of the fourth support leg.

[0010] Preferably, the connecting piece includes a cross - beam, a tension rod, an anchor buckle, a T - shaped head, an anchor nut and a tensioning device. The cross - beam is arranged along the transverse bridge direction and is fixedly arranged at intervals along the longitudinal bridge direction in the middle of the main girder. The tension rods extend vertically and are symmetrically arranged at both ends of each cross - beam. The upper end of the tension rod passes upward through the cross - beam, the tension nut and the tensioning device in sequence. The lower end of the tension rod is connected to the T - shaped head, and the T - shaped head can rotate relative to the tension rod in the horizontal direction. The anchor buckle is welded on the surface of the upper steel plate of the steel box girder segment, and a rectangular hole is opened on the anchor buckle. Cross - shaped anchoring is realized by passing the T - shaped head downward into the rectangular hole and then rotating it by 90°. After the T - shaped head is anchored to the anchor buckle, the tensioning device symmetrically tensions the tension rod and locks it through the anchor nut, temporarily fixing the steel box girder segment and the main girder as a whole.

[0011] On the other hand, the present invention also provides a synchronous over - span steel box girder pushing and erection method, including the following steps: S1. The movable support leg rotates to the vertical state, and the lower end is temporarily fixed to the support leg foundation structure. The foundation support leg and the movable support leg jointly support the main girder. The girder transporting vehicle passes through the foundation support leg to transport the steel box girder segment to a position flush with the front section of the already erected steel box girder. S2. The steel box girder segment is lifted by the lowering system, and the steel box girder segment and the main girder are temporarily locked and connected through the connecting piece. S3. The first jacking support, the second jacking support and the self - propelled pushing system jointly push the main girder. S4. During the pushing process, the height difference of the second jacking support is compensated by the shims. After the steel box girder segment moves to the corresponding position in the longitudinal bridge direction, the steel box girder segment is lowered and welded by the lowering system. S5. After the movable outrigger is retracted, it rotates to the horizontal state and is hooked on the main beam. The movable outrigger is pushed and slid to the front side of the corresponding bearing platform when installing the next span of steel box girder segments through the self - propelled pushing system, and the connection between the movable outrigger and the outrigger foundation structure of the next span is adjusted to complete the pushing installation of one span of steel box girder segments and the forward movement of the main beam.

[0012] The present invention has at least the following beneficial effects: The synchronous over - span steel box girder pushing and erection equipment and erection method of the present invention include a bridge girder, an outrigger system, a connection mechanism, and a pushing system. The outrigger system includes a basic outrigger and a movable outrigger, and the pushing system includes a first pushing support, a second pushing support, and a self - propelled pushing system. The steel box girder segments are quickly and temporarily locked and connected to the bridge girder through connecting parts, and then the first pushing support and the second pushing support are set on the bridge deck to push the main beam. Among them, the height of the second pushing support is relatively low, which is convenient for the steel box girder segments on the main beam to pass through, so that the first pushing support and the second pushing support can directly run and turnover on the bridge deck. When the main beam crosses the span, it drives the steel box girder segments to move synchronously. After the main beam is pushed in place, the length dimension of the movable outrigger can be telescopically adjusted and slides forward and crosses the span through the self - propelled pushing system, without temporarily installing and disassembling multiple traditional support structures, improving the construction efficiency of steel box girder erection on the bridge, reducing the amount of support measures, and significantly enhancing the economic benefits.

[0013] Other advantages, objectives, and features of the present invention will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a general layout structure diagram of the synchronous over - span steel box girder pushing and erection equipment of the present invention erected on the bridge by using the outrigger system; Figure 2 It is a general layout structure diagram of the synchronous over - span steel box girder pushing and erection equipment of the present invention when the steel box girder segments are transported to the front end of the installed bridge and leveled; Figure 3 It is a general layout structure diagram of the synchronous over - span steel box girder pushing and erection equipment of the present invention when moving forward synchronously through the pushing system; Figure 4 It is a structural diagram of the movable outrigger of the synchronous over - span steel box girder pushing and erection equipment of the present invention when rotating forward; Figure 5 It is a side view structure diagram of the steel box girder segments connected to the bridge girder through connecting parts on the main beam of the present invention; Figure 6 It is a structural diagram of the movable outrigger of the present invention; Figure 7 It is a structural diagram of the self - propelled pushing system of the present invention; Reference numerals in the drawings: 1, main beam; 2, lowering system; 3, elevation block; 4, mobile support leg; 5, first support leg; 6, second support leg; 7, third support leg; 8, fourth support leg; 9, fifth support leg; 10, connecting member; 11, support leg foundation structure; 12, first jacking support; 13, second jacking support; 14, self-propelled jacking system; 15, girder carrier; 16, steel box girder segment; 17, installed steel box girder; 20, anchor buckle; 21, tension rod; 22, T-head; 23, crossbeam; 24, anchoring nut; 25, tensioning facility; 30, standard segment; 31, standard adjustment segment; 32, telescopic segment; 33, support pin shaft; 34, adjustment oil cylinder; 35, screw jack; 40, conversion oil cylinder; 41, rotating pin shaft; 42, hanging wheel; 43, winch; 44, walking oil cylinder. Detailed implementation manners

[0015] The present invention will be further described in detail below with reference to the drawings, so that those skilled in the art can implement it according to the description in the specification.

[0016] It should be noted that, unless otherwise specified, the experimental methods described in the following implementation manners are all conventional methods, and the reagents and materials, unless otherwise specified, can all be obtained from commercial channels; in the description of the present invention, the orientation or positional relationship indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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 invention.

[0017] As Figure 1-7 shown, the present invention provides a synchronous over-span steel box girder jacking and erection equipment, including: A main beam 1, which is arranged along the girder erection direction, and a lowering system 2 for lifting and lowering the steel box girder segment 16 located directly below is arranged in the middle of the main beam 1. An elevation block 3 having the same height as the steel box girder segment 16 is connected downward at the rear side of the lifted steel box girder segment 16 on the main beam 1; A support leg system, which includes a plurality of foundation support legs arranged in sequence along the girder erection direction at the bottom of the main beam 1 and a mobile support leg 4 slidably connected along the longitudinal bridge direction at the front bottom of the main beam 1. The mobile support leg 4 can be rotated forward relative to the main beam 1 to a horizontal state and hung on the main beam 1. The mobile support leg 4 can be telescopic in the length direction, and the lower end supports on the front end of the bearing platform in the vertical state; Connecting mechanism, which includes a connecting member 10 arranged in the middle of the main girder 1 and a leg foundation structure 11 arranged on the pier. The connecting member 10 is used for locking and connecting with the steel box girder segment 16 directly below, and the leg foundation structure 11 is used for detachably and fixedly connecting with the bottom of the moving leg 4 in the vertical state; Incremental launching system, which includes a self-propelled incremental launching system 14 arranged between the upper ends of the main girder 1 and the moving leg 4, and a first incremental launching bracket 12 and a second incremental launching bracket 13 arranged in sequence on the already installed steel box girder segment 17 along the beam erection direction. The self-propelled incremental launching system 14 is used to make the moving leg 4 and the main girder 1 move relatively. The first incremental launching bracket 12 is used to push the main girder 1 along the bridge erection direction, and the second incremental launching bracket 13 is used to push the steel box girder segment 16 and the shim block 3 along the bridge erection direction.

[0018] When the bridge girder erection machine main girder 1 transports and installs the steel box girder segment 16, by moving along the beam erection direction, that is, as Figure 1As shown in the right direction and front side, the interval-arranged foundation legs and the mobile legs 4 are supported together, wherein most of the foundation legs are supported on the installed steel box beams, the foundation legs can adopt the existing leg structure of the bridge erection machine, and some foundation legs are supported on the pier tops, and the mobile legs 4 have telescopic ability, which can adapt to the erection requirements of steel box beams with different longitudinal slopes and different pier heights, and have wider adaptability. After the main beam 1 is supported and positioned, the steel box beam segment 16 is installed by using the lowering system 2 and the connecting piece 10 installed on the main beam 1. The steel box beam segment 16 is first carried by the beam transport vehicle 15 to The front end of the steel box girder segment 16 is flush with the front end of the installed steel box girder 17. At this time, the lowering system 2 is located directly above the steel box girder segment 16 to be installed. The lowering system 2 is generally configured as a hoisting system of the winch 43 type, a mobile overhead crane, etc. After the steel box girder segment 16 is lifted to the bottom of the main beam 1, the steel box girder segment 16 is temporarily fixed to the main beam 1 through the connecting piece 10, so that the main beam 1 of the bridge erection machine and the steel box girder segment 16 can move synchronously, the beam transport vehicle 15 is removed, and the first jacking bracket 12 and the second jacking bracket 13 are erected. The first jacking bracket 12 directly acts on the main beam. 1. The second jacking bracket 13 is located below the front end of the steel box girder segment 16 and on the padding block 3. The padding block 3 supplements the jacking range beyond the length of the steel box girder segment 16. Generally, the main body of the first jacking bracket 12 and the second jacking bracket 13 can adopt a conventional bracket structure. A walking jacking jack is placed on the top of the jacking bracket, and a leveling block is set at the bottom of the bracket structure to adjust the longitudinal slope and transverse slope of the bridge deck. During jacking, after the first jacking bracket 12 and the second jacking bracket 13 are placed in the corresponding positions, the reciprocating jacking action of the two jacking jacks is used to move the main beam 1 forward, and the mobile leg The upper end of the self-propelled jacking system 14 moves forward and backward relatively, and the lower end is temporarily fixed to the support leg foundation structure 11. When moving forward synchronously, the main beam 1, the steel box beam segment 16, the pad block 3, and the movable support leg 4 are respectively used as a jacking fulcrum, and the structural force is more reasonable. The second jacking bracket 13 is located at the bottom of the steel box beam segment 16 for jacking, and the height dimension is set to be smaller, so that it can be directly turned around on the bridge deck. The movable support leg 4 can move along with the main beam 1 of the bridge erection machine under the action of the self-propelled jacking system 14, thereby reducing a large amount of measure materials and the turnover of measure materials.

[0019] In another technical solution, Figure 1-4As shown, the basic legs include the first leg 5, the second leg 6, the third leg 7, the fourth leg 8, and the fifth leg 9 which are sequentially arranged at intervals along the bridge erection direction and can be retracted and extended. The first leg 5, the second leg 6, and the third leg 7 are used to support on the installed bridge, and the fourth leg 8 and the fifth leg 9 are used to support on the pier top. The connecting member 10 is located between the third leg 7 and the fourth leg 8. When the girder transporter 15 transports the steel box girder segment 16, it sequentially passes through the first leg 5, the second leg 6, and the third leg 7. After setting up the jacking system, all the legs are retracted, and vertical support and jacking are carried out by relying on the first jacking bracket 12, the second jacking bracket 13, and the movable leg 4.

[0020] In another technical solution, as Figure 1-4 , 6 shows, the movable leg 4 includes a standard section 30, a standard adjustment section 31, a telescopic section 32, an adjustment oil cylinder 34, and a screw jack 35 which are sequentially connected from top to bottom. The upper end of the standard section 30 is connected to the self-propelled jacking system 14. The number of the standard adjustment sections 31 is ≥0. The sum of the length adjustments of the standard adjustment section 31 and the telescopic section 32 for the movable leg 4 is not less than 10 m. The adjustment range of the pier height difference of more than 10 m is achieved by increasing or decreasing the number of the standard adjustment sections 31 and adjusting the length of the telescopic section 32 by the adjustment oil cylinder 34. The telescopic section 32 is a matching structure of an outer rod sleeved with an inner rod, and the length of the inner rod inserted into the outer rod is driven by the expansion and contraction of the adjustment oil cylinder 34. The relative position between the inner rod and the outer rod is fixed by a support pin shaft 33 to realize the length adjustment of the front jacking leg. When the main girder 1 needs to be jacked, the bottom of the screw jack 35 is detachably and fixedly connected to the leg foundation structure 11. When the movable leg 4 needs to be rotated, the connection between the screw jack 35 and the leg foundation structure 11 is released, then the length of the movable leg 4 is contracted upward, and then it is rotated forward.

[0021] In another technical solution, as Figure 3 , 4As shown in FIGS. 6 and 7, the self-propelled pushing system 14 includes a base which is slidably connected to the bottom of the main beam 1. A traveling oil cylinder 44 is connected to the rear side of the base on the main beam 1 for driving the base to move back and forth. On the bottom of the base and the top of the standard segment 30, outer ear plates and inner ear plates are arranged in sequence and symmetrically along the beam erection direction. A first rotating pin shaft 41 is detachably passed through between the symmetric outer ear plates, and a second rotating pin shaft 41 is detachably passed through between the symmetric inner ear plates. By passing through the first rotating pin shaft 41 and the second rotating pin shaft 41, the base is temporarily connected to the standard segment 30 as a whole. A conversion oil cylinder 40 is connected downward in the middle of the base to push the standard segment 30 downward. A winch 43 and a hanging wheel 42 are slidably arranged on the bottom plate of the main beam 1 at the front end of the base. The traction end of the winch 43 is detachably connected to the lower end of the moving support leg 4 for lifting the moving support leg 4 to a horizontal state. The hanging wheel 42 is used for hanging the lower end of the moving support leg 4 in the horizontal state.

[0022] Before the moving support leg 4 needs to start walking, adjust the screw jack 35 to separate the moving support leg 4 as a whole from the support leg foundation structure 11. Then, by adjusting the oil cylinder 34, reduce the length of the telescopic section 32 to further increase the gap between the bottom and the support leg foundation structure 11. The conversion oil cylinder 40 is pushed to make the first rotating pin shaft 41 and the second rotating pin shaft 41 in a relaxed state. Pull out the first rotating pin shaft 41, use the second rotating pin shaft 41 as the rotation point, release the restriction of the conversion oil cylinder 40, and then connect the traction rope of the winch 43 to the lower end of the moving support leg 4 to rotate the moving support leg 4 as a whole to the horizontal state under the main beam 1 of the bridge erecting machine. Hang the moving support leg 4 on the main beam 1 with the hanging wheel 42, release the traction connection with the winch 43, use the traveling oil cylinder 44 to push the moving support leg 4 and the hanging wheel 42 to the next span position. Finally, release the hanging wheel 42, rotate the moving support leg 4 in the reverse direction, and then connect it to the support leg foundation structure 11 on the next pier to complete the installation of a steel box girder segment 16 in one span and the forward movement of the equipment.

[0023] In another technical solution, as Figure 1-4 shown, the cross-sectional dimension of the front end of the main beam 1 gradually decreases forward at the front end of the fourth support leg 8. The main beam 1 is a box-shaped section or a truss structure welded by steel plates. The outer dimension of the main beam 1 between the fourth support leg 8 and the fifth support leg 9 gradually becomes smaller to reduce the self-weight of the structure.

[0024] In another technical solution, as Figure 5As shown in the figure, the connecting member 10 includes a cross beam 23, a tension rod 21, an anchor buckle 20, a T-shaped head 22, an anchor nut 24 and a tensioning device 25. The cross beam 23 is arranged along the transverse direction of the bridge and is fixedly arranged at intervals along the longitudinal direction of the bridge in the middle of the main beam 1. The tension rod 21 extends vertically and is symmetrically arranged at both ends of each cross beam 23. A pair of tension rods 21 are inserted into each end of the cross beam 23. The upper end of the tension rod 21 sequentially passes through the cross beam 23, the tension nut and the tensioning device 25 upward. The lower end of the tension rod 21 is connected to the T-shaped head 22. The T-shaped head 22 can rotate relative to the tension rod 21 in the horizontal direction. The anchor buckle 20 is welded on the surface of the upper steel plate of the steel box girder segment 16. A rectangular hole is opened in the anchor buckle 20. Cross-shaped anchoring is realized by inserting the T-shaped head 22 downward into the rectangular hole and then rotating it by 90°. After the T-shaped head 22 is anchored to the anchor buckle 20, the tensioning device 25 symmetrically tensions the tension rod 21 and locks it through the anchor nut 24, temporarily fixing the steel box girder segment 16 and the main beam 1 into one body, realizing rapid locking connection, improving work efficiency. When the steel box girder segment 16 is lowered and installed later, the end of the tension rod 21 is cut off.

[0025] The present invention also provides a synchronous over-span steel box girder jacking erection method, which combines Figure 1-7 as shown in the figure, and includes the following steps: S1. The movable support leg 4 rotates to the vertical state, and the lower end is temporarily fixed to the support leg foundation structure 11. The foundation support leg and the movable support leg 4 jointly support the main beam 1. The girder transport vehicle 15 passes through the foundation support leg to transport the steel box girder segment 16 to a position flush with the previously erected front section of the steel box girder. S2. The lowering system 2 is used to lift the steel box girder segment 16, and the steel box girder segment 16 and the main beam 1 are temporarily locked and connected through the connecting member 10. S3. The first jacking support 12, the second jacking support 13 and the self-propelled jacking system 14 jointly jack the main beam 1. S4. During the jacking process, the height difference of the jacking of the second jacking support 13 is compensated by the shim block 3. After the steel box girder segment 16 moves to the corresponding position in the longitudinal direction of the bridge, the lowering system 2 is used to lower and weld the steel box girder segment 16. S5. After the movable support leg 4 contracts, it rotates to the horizontal state and is hung on the main beam 1. The self-propelled jacking system 14 is used to jack and slide the movable support leg 4 to the front side of the corresponding bearing platform when the next-span steel box girder segment 16 is installed, and the connection between the movable support leg 4 and the support leg foundation structure 11 of the next span is adjusted to complete the jacking installation of one-span steel box girder segment 16 and the forward movement of the main beam 1.

[0026] In the synchronous over-span launching method of the steel box girder in this embodiment, the steel box girder segment and the main girder of the bridge erecting machine are quickly and temporarily locked and connected through connecting parts, and then the first jacking support and the second jacking support are arranged on the bridge deck to jack the main girder. The height of the second jacking support is relatively low, which is convenient for the steel box girder segment on the main girder to pass through, so that the first jacking support and the second jacking support can directly run and turn on the bridge deck. When the main girder crosses the span, it drives the steel box girder segment to move synchronously. After the main girder is jacked in place, the length dimension of the moving leg can be telescopically adjusted, and it can slide forward and cross the span through the self-propelled jacking system, without temporarily installing and dismantling multiple traditional support structures, improving the construction efficiency of the steel box girder erection on the bridge, reducing the amount of support measures, and significantly enhancing the economic benefits.

[0027] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated and described examples here.

Claims

1. A synchronous over-span steel box girder jacking erection equipment, characterized in that: include: The main beam is extended along the beam erection direction, a lowering system for lifting the steel box beam segment located directly below is arranged in the middle of the main beam, and a padding block with the same height as the steel box beam segment is connected downwardly to the rear side of the main beam located at the lifted steel box beam segment; The outrigger system includes a plurality of basic outriggers arranged in sequence along the beam erection direction at the bottom of the main beam and a movable outrigger slidably connected to the bottom of the front end of the main beam along the longitudinal bridge direction. The movable outrigger can be rotated forward to a horizontal state relative to the main beam and hung on the main beam. The movable outrigger can be extended and retracted in the length direction, and the lower end is supported at the front end of the pedestal in the vertical state. The connection mechanism includes a connection piece arranged in the middle of the main beam and a support leg foundation structure arranged on the cap, wherein the connection piece is used for locking and connecting with the steel box beam segment directly below, and the support leg foundation structure is used for detachably fixing and connecting with the bottom of the movable support leg in the vertical state; The jacking system includes a self-propelled jacking system arranged between the main beam and the upper end of the movable support leg, and a first jacking bracket and a second jacking bracket which are sequentially arranged on the installed steel box beam segments along the beam erection direction. The self-propelled jacking system is used to make the movable support leg and the main beam move relative to each other, the first jacking bracket is used to jack the main beam along the bridge erection direction, and the second jacking bracket is used to jack the steel box beam segments and the cushion blocks along the bridge erection direction.

2. The synchronous over-span steel box girder jacking erection equipment according to claim 1 is characterized in that: The basic legs include a first leg, a second leg, a third leg, a fourth leg, and a fifth leg which are arranged in sequence at intervals along the bridge erection direction and can be retracted and extended. The first leg, the second leg, and the third leg are used to support the installed bridge, and the fourth leg and the fifth leg are used to support the pier top. The connecting piece is located between the third leg and the fourth leg.

3. The synchronous over-span steel box girder jacking erection equipment according to claim 1, characterized in that: The mobile leg includes a standard segment, a standard adjustment segment, a telescopic segment, an adjustment cylinder and a screw jack which are sequentially connected from top to bottom. The upper end of the standard segment is connected to the self-propelled jacking system. The number of standard adjustment segments is ≥0. The sum of the length adjustments of the mobile leg by the standard adjustment segment and the telescopic segment is not less than 10m. The telescopic segment is a matching structure in which an outer rod is sleeved with an inner rod, and the length of the inner rod is driven to be sleeved into the outer rod by adjusting the extension and contraction of the cylinder. The relative position between the inner rod and the outer rod is fixed by a supporting pin shaft, and the bottom of the screw jack is detachably fixedly connected to the leg base structure.

4. The synchronous over-span steel box girder jacking erection equipment according to claim 3 is characterized in that: The self-propelled pushing system includes a base, which is slidably connected to the bottom of the main beam, and a walking cylinder is connected to the main beam at the rear side of the base for driving the base to move forward and backward. The bottom of the base and the top of the standard segment are sequentially and symmetrically provided with outer ear plates and inner ear plates along the beam-standing direction, and a first rotating pin is detachably passed through the symmetrical outer ear plates, and a second rotating pin is detachably passed through the symmetrical inner ear plates, and the base and the standard segment are temporarily connected as one by passing the first rotating pin and the second rotating pin, and a conversion cylinder is downwardly connected to the middle part of the base to push the standard segment downward, and a winch and a hanging wheel are slidably provided on the bottom plate of the main beam at the front end of the base, and the traction end of the winch is detachably connected to the lower end of the mobile leg for lifting the mobile leg to a horizontal state, and the hanging wheel is used to hang the lower end of the mobile leg in a horizontal state.

5. The synchronous over-span steel box girder jacking erection equipment according to claim 2, characterized in that: The cross-sectional dimension of the front end of the main beam gradually decreases toward the front end of the fourth leg.

6. The synchronous over-span steel box girder jacking erection equipment according to claim 1, characterized in that: The connecting parts include a shoulder pole beam, a tensioning rod, an anchor buckle, a T-head, an anchor nut and a tensioning facility. The shoulder pole beam is arranged along the transverse direction of the bridge and is fixedly arranged at intervals along the longitudinal direction of the bridge in the middle part of the main beam. The tensioning rod extends vertically and is symmetrically arranged at both ends of each shoulder pole beam. The upper end of the tensioning rod passes through the shoulder pole beam, the tensioning nut and the tensioning facility in sequence upward. The lower end of the tensioning rod is connected to the T-head, and the T-head can rotate in the horizontal direction relative to the tensioning rod. The anchor buckle is welded to the upper steel plate surface of the steel box girder segment. A rectangular hole is opened on the anchor buckle. The T-head is inserted downward into the rectangular hole and then rotated 90° to achieve cross anchoring. When the T-head and the anchor buckle are anchored, the tensioning facility symmetrically pulls the tensioning rod and locks it through the anchor nut to temporarily fix the steel box girder segment and the main beam as a whole.

7. The method for jacking and erecting a synchronous over-span steel box girder according to claim 6, characterized in that: The steps include: S1, the movable legs are rotated to a vertical state, and the lower ends are temporarily fixed to the leg foundation structure, the foundation legs and the movable legs jointly support the main beam, and a beam transport vehicle is used to pass through the foundation legs to transport the steel box beam segment to a position flush with the front section of the erected steel box beam; S2, using the lowering system to lift the steel box girder segment, and temporarily lock and connect the steel box girder segment and the main beam through the connecting piece; S3, the first pushing bracket, the second pushing bracket, and the self-propelled pushing system jointly push the main beam; S4, during the jacking process, the jacking height difference of the second jacking bracket is compensated by the shim block, and after the steel box girder segment is moved to the corresponding position along the bridge direction, the steel box girder segment is laid and welded by the lowering system; S5. The movable legs are retracted and rotated to a horizontal state and are hung on the main beam. The movable legs are pushed and slid to the front side of the corresponding pedestal when the next span of steel box girder segment is installed through the self-propelled pushing system. The movable legs are adjusted to be connected with the leg foundation structure of the next span, and the pushing installation of a span of steel box girder segment and the forward movement of the main beam are completed.

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