Synchronous overcrossing type steel box girder pushing erection equipment and erection method

Abstract

The application discloses a synchronous over-span steel box girder pushing erection equipment and an erection method, which comprises a bridge erecting machine main beam, a supporting leg system, a connecting mechanism and a pushing system. The supporting leg system comprises a foundation supporting leg and a moving 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 section is quickly and temporarily locked and connected with the bridge erecting machine main beam through the connecting piece, and then the first pushing support and the second pushing support are arranged on the bridge deck to push the main beam. The second pushing support is relatively low in height, and the steel box girder section on the main beam can pass through the second pushing support, so that the first pushing support and the second pushing support can directly operate and circulate on the bridge deck. When the main beam passes through the span, the steel box girder section is synchronously moved. After the main beam is pushed into place, the length of the moving supporting leg can be adjusted in size, and the self-walking pushing system is used to slide and walk through the span. The traditional support structure does not need to be temporarily installed and removed, the steel box girder erection construction efficiency is improved, the support measure amount is reduced, and the economic benefit is remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge engineering. More particularly, the present application relates to a synchronous over-span steel box girder pushing erection equipment and erection method. BACKGROUND

[0002] With the rapid development of economic society, the reconstruction and expansion in the field of bridge engineering has gradually replaced the new construction business to become a popular and mainstream trend in the industry development. Compared with the new construction, the reconstruction and expansion of the bridge has the characteristics of multiple boundary conditions, multiple limiting factors, complex surrounding environment, high traffic preservation requirements, etc. The reconstruction and expansion of the bridge generally includes plane expansion, three-dimensional expansion and other ways. When there is no land available for occupation around the existing bridge or the difficulty and cost of demolition are high, the three-dimensional expansion method is preferred. Patent (CN115821793A) discloses a single-span beam walking type pushing erection process with a counter beam structure, which includes the steps of installing the pushing erection equipment, transporting the to-be-installed main beam to the installed bridge, folding or retracting the supporting leg, temporarily connecting the to-be-installed main beam and the counter beam by the beam lifting vehicle, pushing, etc. It can adapt to the large volume, large weight, irregular beam width change, steel box girder width projection range covering the highway lane, and very limited space for the erection of the landing support. For the existing construction process, since the segmented position of the pushing steel box girder is located directly above the pier, there is no working space for the ring seam welding at the pier top position of the steel box girder bridge, so the segmented position of the steel box girder generally needs to exceed the main pier and offset by a certain distance, which causes the corresponding supporting leg structure to be unable to support on the pier. At the same time, the pushing erection equipment matched with the process needs to constantly circulate the rear pushing support and the front pushing support. Each steel box girder pushing installation needs three sets of pushing supports, i.e. the rear pushing support, the front pushing support and the rear span pushing support. These are all measure structures. If a large amount of bridge pushing operation is required, the amount of temporary measure materials is large, and the circulation requires a large amount of manpower and material resources, which is high in cost. Moreover, the existing front pushing support needs to be lowered before the steel box girder is lowered. In actual implementation, it is difficult to operate due to the steel box girder covering the top and the large weight of the support itself. It cannot quickly adapt to the change of erection height, the temporary quick connection method of the main beam and the counter beam is not clear, etc. This results in a large amount of pushing support circulation, affects the construction efficiency, and limits its further promotion and application value. SUMMARY

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

[0004] Another object of the present application is to provide a synchronous over-span steel box girder pushing erection equipment and erection method to solve the technical problems of difficulty in setting the pushing support and difficulty in circulation in the process of segment pushing construction of the steel box girder in the prior art.

[0005] In order to achieve the objects and other advantages according to the present application, in one aspect, the present application provides a synchronous overcrossing steel box girder pushing erection equipment, comprising:

[0006] a main girder extending along the girder erection direction, a lowering system for lifting and lowering a steel box girder segment located directly below being arranged at the middle of the main girder, and a heightening block being connected to the main girder at the rear side of the lifted steel box girder segment and being in the same height as the steel box girder segment;

[0007] a leg system comprising a plurality of base legs arranged in sequence along the girder erection direction at the bottom of the main girder and a mobile leg slidingly connected to the front end of the bottom of the main girder along the longitudinal bridge direction, the mobile leg being rotatable to a horizontal state relative to the main girder and being hung on the main girder, the mobile leg being telescopic in length and being supported at the lower end by the front end of the bearing platform when in the vertical state;

[0008] a connecting mechanism comprising a connecting piece arranged at the middle of the main girder and a leg base structure arranged on the bearing platform, the connecting piece being used for locking connection with the steel box girder segment directly below, and the leg base structure being used for detachable fixed connection with the bottom of the mobile leg in the vertical state;

[0009] a pushing system comprising a self-propelled pushing system arranged between the main girder and the upper end of the mobile leg, and a first pushing support and a second pushing support arranged in sequence along the girder erection direction on the installed steel box girder segment, the self-propelled pushing system being used for relative movement between the mobile leg and the main girder, the first pushing support being used for pushing the main girder along the bridge erection direction, and the second pushing support being used for pushing the steel box girder segment and the heightening block along the bridge erection direction.

[0010] Preferably, the base leg comprises first, second, third, fourth and fifth legs arranged in sequence and spaced along the bridge erection direction and being capable of being set up and taken down, the first, second and third legs being used for supporting on the installed bridge, the fourth and fifth legs being used for supporting on the top of the pier, and the connecting piece being located between the third leg and the fourth leg.

[0011] Preferably, the mobile leg comprises a standard segment, a standard adjusting segment, a telescopic segment, an adjusting oil cylinder and a screw jack arranged in sequence from top to bottom, the upper end of the standard segment being connected to the self-propelled pushing system, the number of the standard adjusting segment being greater than or equal to 0, the length adjustment sum of the standard adjusting segment and the telescopic segment being not less than 10m, the telescopic segment being a cooperating structure of an outer rod sleeving an inner rod, and the length of the inner rod being driven to be sleeved into the outer rod through the telescopic adjustment of the adjusting oil cylinder, the relative position between the inner rod and the outer rod being fixed through a supporting pin shaft, and the bottom of the screw jack being detachably fixedly connected to the leg base structure.

[0012] Preferably, the self-walking pushing system comprises a base, which is in sliding connection with the bottom of the main beam, a walking oil cylinder connected to the main beam at the rear side of the base for driving the base to move forward and backward, and outer and inner side ear plates symmetrically arranged in sequence along the direction of erecting the beam at the top of the standard segment, the symmetric outer side ear plates being detachably provided with a first rotating pin shaft, the symmetric inner side ear plates being detachably provided with a second rotating pin shaft, the base being temporarily connected with the standard segment by the first and second rotating pin shafts, and a conversion oil cylinder connected to the middle part of the base downward for pushing the standard segment downward.

[0013] Preferably, the cross-sectional dimension of the front end of the main beam gradually decreases forward at the front end of the fourth leg.

[0014] Preferably, the connecting member comprises a carrying beam, a tension rod, an anchor, a T-shaped head, an anchor nut and a tensioning device, the carrying beam is arranged along the transverse bridge direction and is fixedly arranged along the longitudinal bridge direction at the middle part of the main beam, the tension rod is vertically extended and symmetrically arranged at both ends of each carrying beam, the upper end of the tension rod passes through the carrying beam, the anchor nut and the tensioning device in sequence upward, the lower end of the tension rod is connected with the T-shaped head, the T-shaped head can rotate in the horizontal direction relative to the tension rod, the anchor is welded on the surface of the upper steel plate of the steel box beam segment, a rectangular hole is formed in the anchor, the T-shaped head is rotated 90° after being downwardly inserted into the rectangular hole to realize cross anchoring, and when the T-shaped head is anchored with the anchor, the tensioning device symmetrically tightens the tension rod and is locked by the anchor nut to temporarily fix the steel box beam segment and the main beam as a whole.

[0015] In another aspect, the application further provides a synchronous overpass type steel box beam pushing erecting method, comprising the following steps:

[0016] S1, the mobile leg is rotated to the vertical state, and the lower end is temporarily fixed with the leg base structure, the base leg and the mobile leg jointly support the main beam, and the beam transport vehicle is used to pass through the base leg to transport the steel box beam segment to the position flush with the already erected steel box beam front segment;

[0017] S2, the steel box beam segment is lifted by the lowering system, and the steel box beam segment and the main beam are temporarily locked and connected by the connecting member;

[0018] S3, the first pushing support, the second pushing support and the self-walking pushing system jointly push the main beam;

[0019] S4, in the process of pushing, the pushing height difference of the second pushing support is compensated by the cushioning block, after the steel box girder segment moves to the corresponding position along the bridge, the steel box girder segment is lowered and welded by using the lowering system;

[0020] S5, the moving leg is rotated to the horizontal state after the moving leg is retracted, and is hung on the main beam, the moving leg is pushed and slid to the front side of the bearing of the next span steel box girder segment by the self-walking pushing system, the moving leg is connected with the leg foundation structure of the next span, and the pushing installation of the one-span steel box girder segment and the forward movement of the main beam are completed.

[0021] The synchronous over-span steel box girder pushing erection equipment and the erection method have at least the following beneficial effects: the synchronous over-span steel box girder pushing erection equipment and the erection method comprise a bridge erecting machine main beam, a leg system, a connecting mechanism and a pushing system, the leg system comprises a foundation leg and a moving leg, the pushing system comprises a first pushing support, a second pushing support and a self-walking pushing system, the steel box girder segment and the bridge erecting machine main beam are quickly and temporarily connected through the connecting piece, then the first pushing support and the second pushing support are arranged on the bridge deck to push the main beam, the second pushing support is low in height, the steel box girder segment on the main beam can pass through, the first pushing support and the second pushing support can directly operate and circulate on the bridge deck, the main beam drives the steel box girder segment to synchronously move when the main beam moves over the span, the length of the moving leg can be adjusted in size after the main beam is pushed into place, the moving leg is slid and walked over the span through the self-walking pushing system, a plurality of traditional supports do not need to be temporarily arranged and removed, the construction efficiency of the steel box girder bridge erection is improved, the support measure amount is reduced, and the economic benefit is significantly improved.

[0022] Other advantages, objects, and features of the present application will be apparent to those skilled in the art from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The overall arrangement structure schematic diagram of the synchronous over-span steel box girder pushing erection equipment of the present application is arranged on the bridge by using the leg system;

[0024] Figure 2 The overall arrangement structure schematic diagram of the synchronous over-span steel box girder pushing erection equipment of the present application is arranged on the bridge by using the leg system;

[0025] Figure 3 The overall arrangement structure schematic diagram of the synchronous over-span steel box girder pushing erection equipment of the present application is arranged on the bridge by using the leg system;

[0026] Figure 4 The structure schematic diagram of the moving leg of the synchronous over-span steel box girder pushing erection equipment of the present application is rotated forward;

[0027] Figure 5 Side view structure diagram of connecting the steel box girder section by the connecting piece on the main girder of the present application;

[0028] Figure 6 Structure schematic diagram of the mobile support leg of the present application;

[0029] Figure 7 Structure schematic diagram of the self-walking jacking system of the present application;

[0030] The description of the drawings: 1, main girder, 2, lowering system, 3, heightening 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 piece, 11, support leg foundation structure, 12, first jacking support, 13, second jacking support, 14, self-walking jacking system, 15, girder transport vehicle, 16, steel box girder section, 17, installed steel box girder, 20, anchor buckle, 21, tensioning rod, 22, T-shaped head, 23, shoulder beam, 24, anchor nut, 25, tensioning facility, 30, standard section, 31, standard adjusting section, 32, telescopic section, 33, supporting pin shaft, 34, adjusting oil cylinder, 35, screw jack, 40, conversion oil cylinder, 41, rotating pin shaft, 42, hanging wheel, 43, winch, 44, walking oil cylinder. DETAILED DESCRIPTION

[0031] The present application will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement the present application according to the description.

[0032] It should be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial channels unless otherwise specified; in the description of the present application, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] As Figures 1-7 shown, the present application provides a synchronous overpass type steel box girder jacking equipment, which comprises:

[0034] A main girder 1 is arranged to extend in the direction of erecting the girder, a lowering system 2 for lifting and lowering a steel box girder section 16 located directly below is arranged at the middle of the main girder 1, and a heightening block 3 with the same height as the steel box girder section 16 is connected downward at the rear side of the main girder 1 where the steel box girder section 16 is lifted;

[0035] The leg system comprises a plurality of base legs arranged in sequence along the erecting direction of the girder at the bottom of the main girder 1 and a movable leg 4 connected to the bottom of the front end of the main girder 1 in the longitudinal direction of the bridge, the movable leg 4 can be rotated to a horizontal state relative to the main girder 1 and hung on the main girder 1, the movable leg 4 can be extended and retracted in the length direction and supported at the lower end of the front end of the bearing platform in the vertical state;

[0036] The connecting mechanism comprises a connecting piece 10 arranged at the middle part of the main girder 1 and a leg base structure 11 arranged on the bearing platform, the connecting piece 10 is used for locking connection with the steel box girder segment 16 directly below, and the leg base structure 11 is used for detachable fixed connection with the bottom of the movable leg 4 in the vertical state;

[0037] The pushing system comprises a self-propelled pushing system 14 arranged between the main girder 1 and the upper end of the movable leg 4 and a first pushing support 12 and a second pushing support 13 arranged in sequence along the erecting direction of the girder on the installed steel box girder segment 17, the self-propelled pushing system 14 is used for relative movement between the movable leg 4 and the main girder 1, the first pushing support 12 is used for pushing the main girder 1 in the erecting direction of the bridge, and the second pushing support 13 is used for pushing the steel box girder segment 16 and the cushion block 3 in the erecting direction of the bridge.

[0038] When the bridge erecting machine main girder 1 is conveying and installing the steel box girder segment 16, the movable leg 4 is rotated to the horizontal state relative to the main girder 1 and hung on the main girder 1, and the self-propelled pushing system 14 is used for relative movement between the movable leg 4 and the main girder 1, so that the main girder 1 is pushed in the erecting direction of the bridge, and the steel box girder segment 16 and the cushion block 3 are pushed in the erecting direction of the bridge. Figure 1The right direction, front side, the interval arrangement of the foundation leg and the moving leg 4 are supported together, wherein most of the foundation legs are supported on the installed steel box girder, and the foundation legs adopt the existing leg structure of the bridge girder erection machine, and part of the foundation legs are supported on the pier top. The moving leg 4 has telescopic capacity and can adapt to the steel box girder erection requirements of different longitudinal slopes and different pier heights, and has wider adaptability. After the main girder 1 is supported and positioned, the steel box girder section 16 is installed by using the lowering system 2 and the connecting piece 10 installed on the main girder 1. First, the steel box girder section 16 is carried to the front end of the steel box girder section 16 by using the beam carrying vehicle 15, and the front end of the installed steel box girder 17 is flush. At this time, the lowering system 2 is located directly above the steel box girder section 16 to be installed. The lowering system 2 is generally set as a lifting system such as a winch 43 type lifting system and a movable crane. After the steel box girder section 16 is lifted to the bottom of the main girder 1, the steel box girder section 16 is temporarily fixed with the main girder 1 through the connecting piece 10, so that the bridge girder erection machine main girder 1 and the steel box girder section 16 can move synchronously. The beam carrying vehicle 15 is removed, the first pushing support 12 and the second pushing support 13 are erected, the first pushing support 12 directly acts on the main girder 1, the second pushing support 13 is located below the front end of the steel box girder section 16 and on the heightening block 3, and the heightening block 3 supplements the pushing range exceeding the length of the steel box girder section 16. Generally, the main body of the first pushing support 12 and the second pushing support 13 can adopt a conventional support structure. The walking type pushing jack is placed at the top of the support structure, and the leveling block is arranged at the bottom of the support structure to adjust the longitudinal slope and the transverse slope of the bridge surface. After the first pushing support 12 and the second pushing support 13 are placed in the corresponding positions, the main girder 1 is moved forward by using the reciprocating pushing action of the two pushing jacks. The upper end of the moving leg 4 moves forward and backward relative to the leg foundation structure 11 through the self-walking pushing system 14, and the lower end is temporarily fixed. When moving synchronously, the main girder 1, the steel box girder section 16, the heightening block 3 and the moving leg 4 respectively serve as a pushing support point, and the structure is more reasonable in stress. The second pushing support 13 is located at the bottom of the steel box girder section 16, and the setting height dimension is smaller, so that the second pushing support 13 can be directly circulated on the bridge surface. The moving leg 4 can walk with the bridge girder erection machine main girder 1 under the action of the self-walking pushing system 14, thereby reducing the number and circulation amount of a large amount of measure materials.

[0039] In another technical solution, as Figures 1-4As shown, the base leg includes first leg 5, second leg 6, third leg 7, fourth leg 8, fifth leg 9 arranged in sequence and spaced apart and can be set up and set down, the first leg 5, the second leg 6, the third leg 7 are used to support on the installed bridge, the fourth leg 8, the fifth leg 9 are used to support on the top of the pier, the connecting piece 10 is located between the third leg 7 and the fourth leg 8. When the girder vehicle 15 transports the steel box girder segment 16, it passes through the first leg 5, the second leg 6, the third leg 7 in sequence, sets up the pushing system, and then sets down all the legs, relies on the first pushing support 12, the second pushing support 13, and the moving leg 4 to carry out vertical support and pushing.

[0040] In another technical solution, as shown in Figures 1-4 , 6, the moving leg 4 includes standard segment 30, standard adjusting segment 31, telescopic segment 32, adjusting oil cylinder 34 and screw jack 35 connected in sequence from top to bottom, the upper end of the standard segment 30 is connected with the self-propelled pushing system 14, the number of the standard adjusting segment 31 is ≥0, the sum of the length adjustment of the moving leg 4 by the standard adjusting segment 31 and the telescopic segment 32 is not less than 10m, the adjustment range of the pier height difference above 10m is realized by increasing or decreasing the number of the standard adjusting segment 31 and adjusting the length of the telescopic segment 32 by the adjusting oil cylinder 34, the telescopic segment 32 is a matching structure of outer rod sleeving inner rod, and the length of the inner rod sleeving into the outer rod is driven by the telescopic adjusting oil cylinder 34, the relative position between the inner rod and the outer rod is fixed by the supporting pin 33, the length adjustment of the front pushing leg is realized, when the main girder 1 needs to be pushed, the bottom of the screw jack 35 is detachably fixedly connected with the leg base structure 11, when the moving leg 4 needs to be rotated, the connection between the screw jack 35 and the leg base structure 11 is released, then the length of the moving leg 4 is contracted upward, and then it is rotated forward.

[0041] In another technical solution, as shown in Figure 3 , 4, 6, 7, the self-walking push system 14 includes a base, the base and the bottom of the main beam 1 sliding connection, the main beam 1 on the base rear side is connected with walking cylinder 44, for driving the base forward and backward, the bottom of the base and the top of the standard segment 30 along the direction of the beam is sequentially and symmetrically provided with an outer ear plate and an inner ear plate, the symmetric outer ear plate is detachably provided with a first rotating pin shaft 41, the symmetric inner ear plate is detachably provided with a second rotating pin shaft 41, the first rotating pin shaft 41 and the second rotating pin shaft 41 are provided to temporarily connect the base and the standard segment 30, the middle part of the base is connected downward with a conversion cylinder 40, to push the standard segment 30 downward, the bottom plate of the main beam 1 is slidingly provided with a winch 43 and a hanging wheel 42 at the front end of the base, the traction end of the winch 43 is detachably connected with the lower end of the mobile leg 4, for lifting the mobile leg 4 to the horizontal state, the hanging wheel 42 is used for hanging the lower end of the mobile leg 4 in the horizontal state.

[0042] When the mobile leg 4 needs to start walking, the screw jack 35 is adjusted to separate the mobile leg 4 from the leg foundation structure 11, then the length of the telescopic segment 32 is reduced by adjusting the cylinder 34 to further increase the gap between the bottom and the leg foundation structure 11, the conversion cylinder 40 is pushed to make the first rotating pin shaft 41 and the second rotating pin shaft 41 in a relaxed state, the first rotating pin shaft 41 is pulled out, the second rotating pin shaft 41 is used as a rotating point, the conversion cylinder 40 is released, the winch 43 is connected with the lower end of the mobile leg 4 to make the mobile leg 4 rotate to the horizontal state under the bridge girder 1, the mobile leg 4 is hung on the main beam 1 by the hanging wheel 42, the traction connection with the winch 43 is released, the mobile leg 4 and the hanging wheel 42 are pushed to the next span position by the walking cylinder 44, finally the hanging wheel 42 is released, the mobile leg 4 is rotated in reverse, and then connected with the leg foundation structure 11 on the next pier cap, the installation of the steel box girder segment 16 and the forward movement of the equipment are completed.

[0043] In another technical solution, as shown in Figures 1-4 The cross-sectional dimension of the front end of the main beam 1 gradually decreases forwardly at the front end of the fourth leg 8. The main beam 1 is a box-shaped cross-section or truss structure welded by steel plates, wherein the cross-sectional dimension of the main beam 1 gradually decreases between the fourth leg 8 and the fifth leg 9, so as to reduce the self-weight of the structure.

[0044] In another technical solution, as shown in Figure 5As shown, the connecting piece 10 comprises a crossbeam 23, a tension rod 21, an anchor 20, a T-shaped head 22, an anchor nut 24 and a tension device 25, the crossbeam 23 is arranged along the transverse bridge and is fixed at the middle of the main beam 1 along the longitudinal bridge, the tension rod 21 extends vertically and is symmetrically arranged at both ends of each crossbeam 23, one pair of tension rods 21 is arranged at each end of the crossbeam 23, the upper end of the tension rod 21 passes through the crossbeam 23, the tension nut and the tension device 25 in turn upwards, the lower end of the tension rod 21 is connected with the T-shaped head 22, the T-shaped head 22 can rotate in the horizontal direction relative to the tension rod 21, the anchor 20 is welded on the surface of the upper layer of the steel box girder segment 16, a rectangular hole is formed on the anchor 20, the T-shaped head 22 is rotated by 90° after passing through the rectangular hole downwards to realize cross anchoring, when the T-shaped head 22 is anchored with the anchor 20, the tension device 25 symmetrically tightens the tension rod 21 and is locked through the anchor nut 24, so that the steel box girder segment 16 and the main beam 1 are temporarily fixed as a whole, the rapid locking connection is realized, the work efficiency is improved, and the end of the tension rod 21 is cut when the steel box girder segment 16 is subsequently lowered and installed.

[0045] The application also provides a synchronous overpass type steel box girder pushing erection method, which combines Figures 1-7 As shown, the method comprises the following steps:

[0046] S1, the movable leg 4 is rotated to the vertical state, and the lower end is temporarily fixed with the leg foundation structure 11, the foundation leg and the movable leg 4 jointly support the main beam 1, the beam carrying vehicle 15 is used to pass through the foundation leg, and the steel box girder segment 16 is transported to the position flush with the front segment of the steel box girder which has been erected;

[0047] S2, the steel box girder segment 16 is lifted by the lowering system 2, and the steel box girder segment 16 is temporarily locked and connected with the main beam 1 through the connecting piece 10;

[0048] S3, the first pushing support 12, the second pushing support 13 and the self-walking pushing system 14 jointly push the main beam 1;

[0049] S4, in the pushing process, the height difference of the second pushing support 13 is compensated by the heightening block 3, after the steel box girder segment 16 moves to the corresponding position along the bridge, the steel box girder segment 16 is lowered and welded by the lowering system 2;

[0050] S5, after the movable leg 4 is contracted and rotated to the horizontal state, the movable leg 4 is hung on the main beam 1, and the movable leg 4 is pushed and slid to the front side of the bearing platform corresponding to the next span steel box girder segment 16 by the self-walking pushing system 14, the movable leg 4 is connected with the leg foundation structure 11 of the next span, the pushing installation of the steel box girder segment 16 of one span and the forward movement of the main beam 1 are completed.

[0051] The synchronous over-span steel box girder pushing erection method of the embodiment temporarily locks and connects the steel box girder section and the bridge erecting machine main beam through the connecting piece, sets the first pushing support and the second pushing support on the bridge deck to push the main beam, the second pushing support is lower in height, the steel box girder section on the main beam is passed, the first pushing support and the second pushing support can directly operate and circulate on the bridge deck, the main beam drives the steel box girder section to synchronously move when the main beam over-spans, the length size of the moving support leg can be extended and retracted after the main beam is pushed into place, the over-span is realized by the self-walking pushing system, a plurality of traditional support structures do not need to be temporarily installed and removed, the construction efficiency of the steel box girder bridge erection is improved, the support measure quantity is reduced, and the economic benefit is significantly improved.

[0052] Although the embodiments of the present application have been disclosed as above, they are not limited to the application listed in the specification and the embodiments, and can be fully applied to various fields suitable for the present application, and additional modifications can be easily realized by those skilled in the art, and therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A synchronous overcrossing steel box girder launching equipment, characterized in that, The utility model relates to a steel box girder erection system, which comprises a main girder, a plurality of foundation legs, a movable leg, a connecting mechanism and a pushing system. The main girder extends along the erection direction and is provided with a launching system for lifting and placing a steel box girder segment located directly below at the middle part of the main girder. The movable leg is connected to the bottom of the front end of the main girder in the longitudinal direction and can rotate to a horizontal state and be hung on the main girder. The connecting mechanism comprises a connecting piece arranged at the middle part of the main girder and a leg foundation structure arranged on the bearing platform. The connecting piece is used for locking connection with the steel box girder segment located directly below.

2. The synchronous overcrossing steel box girder launching equipment of claim 1, wherein, The leg foundation structure is used for detachable fixed connection with the bottom of the movable leg in the vertical state.

3. The synchronous overcrossing steel box girder launching equipment of claim 1, wherein, The pushing system comprises a self-propelled pushing system arranged between the main girder and the upper end of the movable leg, a first pushing support and a second pushing support arranged in sequence on the installed steel box girder segment along the erection direction. The self-propelled pushing system is used for relative movement between the movable leg and the main girder. The first pushing support is used for pushing the main girder along the erection direction of the bridge. The second pushing support is used for pushing the steel box girder segment and the heightening block along the erection direction of the bridge. The foundation leg comprises a first leg, a second leg, a third leg, a fourth leg and a fifth leg arranged in sequence and at intervals along the erection direction and capable of being retracted and extended. The first leg, the second leg and the third leg are used for supporting on the installed bridge. The fourth leg and the fifth leg are used for supporting on the top of the pier. The connecting piece is located between the third leg and the fourth leg. The movable leg comprises a standard segment, a standard adjusting segment, an extension segment, an adjusting oil cylinder and a screw jack arranged in sequence from top to bottom. The upper end of the standard segment is connected with the self-propelled pushing system. The number of the standard adjusting segment is greater than or equal to 0. The length adjustment of the standard adjusting segment and the extension segment is not less than 10 m. The extension segment is a cooperation structure of an outer rod and an inner rod. The length of the inner rod is driven to be retracted into the outer rod through the extension of the adjusting oil cylinder. The relative position between the inner rod and the outer rod is fixed through a supporting pin shaft. The bottom of the screw jack is detachably fixedly connected with the leg foundation structure.

4. The synchronous overcrossing steel box girder launching equipment of claim 3, wherein, The self-walking pushing system comprises a base which is slidingly connected with the bottom of the main beam, a walking oil cylinder is connected with the main beam at the rear side of the base for driving the base to move forward and backward, the bottom of the base is provided with an outer side ear plate and an inner side ear plate in sequence and symmetrically along the direction of erecting the beam, the first rotating pin shaft is detachably arranged through the symmetric outer side ear plates, the second rotating pin shaft is detachably arranged through the symmetric inner side ear plates, the base and the standard segment are temporarily connected as a whole through the first rotating pin shaft and the second rotating pin shaft, a conversion oil cylinder is connected with the middle part of the base downward for pushing the standard segment downward, the bottom plate of the main beam is slidingly provided with a winch and a hanging wheel at the front end of the base, the traction end of the winch is detachably connected with the lower end of the mobile leg for lifting the mobile leg to the horizontal state, and the hanging wheel is used for hanging the lower end of the mobile leg in the horizontal state.

5. The synchronous overcrossing steel box girder launching equipment of claim 2, wherein, The cross-sectional dimension of the front end of the main beam gradually decreases forward at the front end of the fourth leg.

6. The synchronous overcrossing steel box girder launching equipment of claim 1, wherein, The connecting piece comprises a carrying beam, a tension rod, an anchor, a T-shaped head, an anchor nut and a tensioning device, the carrying beam is arranged along the transverse bridge direction and is fixedly arranged along the longitudinal bridge direction at the middle part of the main beam, the tension rod extends vertically and is symmetrically arranged at both ends of each carrying beam, the upper end of the tension rod passes through the carrying beam, the tensioning nut and the tensioning device in sequence upward, the lower end of the tension rod is connected with the T-shaped head, the T-shaped head can rotate in the horizontal direction relative to the tension rod, the anchor is welded on the surface of the upper layer of the steel box girder segment, a rectangular hole is formed in the anchor, the T-shaped head is rotated by 90° after being downwardly inserted into the rectangular hole to realize cross anchoring, and when the T-shaped head is anchored with the anchor, the tensioning device symmetrically tightens the tension rod and is locked through the anchor nut to temporarily fix the steel box girder segment and the main beam as a whole.

7. The method of erecting a synchronous overcrossing steel box girder pushing jacking equipment according to claim 6, characterized in that, The method comprises the following steps: S1, the mobile leg is rotated to the vertical state, and the lower end is temporarily fixed with the leg foundation structure, the foundation leg and the mobile leg jointly support the main beam, the beam carrying vehicle is used to pass through the foundation leg to carry the steel box girder segment to the position flush with the already erected steel box girder front segment; S2, the steel box girder segment is lifted by the lowering system, and the steel box girder segment and the main beam are temporarily locked and connected through the connecting piece; S3, the first pushing support, the second pushing support and the self-walking pushing system jointly push the main beam; S4, during the pushing process, the height difference of the second pushing support is compensated by the heightening block, after the steel box girder segment moves to the corresponding position in the bridge direction, the steel box girder segment is lowered and welded by the lowering system; S5, after the mobile leg is contracted, the mobile leg is rotated to the horizontal state and hung on the main beam, the mobile leg is pushed and slid to the front side of the corresponding pile cap of the next span steel box girder segment installation position by the self-walking pushing system, the mobile leg is connected with the leg foundation structure of the next span, the pushing installation of the steel box girder segment of one span and the forward movement of the main beam are completed.

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