Rapid construction method for pushing, hoisting and closure of river-crossing ultra-wide steel box girder

Abstract

The invention discloses a rapid construction method for pushing, hoisting and closure of a river-crossing ultra-wide steel box girder. The rapid construction method comprises the following steps that S1, construction of a pushing support and an assembling support of a first top beam section is completed through a crawler crane; s2, the steel box girder section of the first top girder section is installed through a crawler crane; s3, construction of the remaining pushing supports and assembly supports is completed through the crawler crane, and then hoisting construction of the guide beam is completed through the crawler crane; s4, the crawler crane completes the installation of the remaining beam sections of the first top steel box beam section and the guide beam on the step land in front of the abutment and the abutment back; s5, welding of the first top beam section is completed, and forward pushing is conducted for 24 m; s6, the crawler crane is hoisted on the abutment back for the second round to push the steel box girder section, and the steel box girder section and the first top girder section are spliced into a whole; s7, completing the welding of the second round of beam sections, and pushing the beam sections forwards for 24 m; s8, the steps S6 and S7 are repeated, and installation and pushing of all the beam sections are completed; s9, the guide beam is dismantled, a crawler crane hoists the head beam section and the tail beam section on the platform backs on the two sides correspondingly, and the assembling support is dismantled; and the pushing support and the jack are used for beam falling, and finally the pushing support is dismounted.

Description

Technical Field

[0001] This application relates to the technical field of box girder incremental launching construction, and in particular to a rapid construction method for incremental launching, hoisting and closure of a super-wide steel box girder across a river. Background Technique

[0002] With the development of urban construction towards a livable and green direction, as one of the important urban infrastructure, the construction of municipal bridges inevitably bears more important landscape requirements. The landscaping of urban bridges faces greater spans, more complex shapes, higher technological standards, etc., which also puts higher requirements on the construction of urban bridges. The construction of urban cross-river steel structure bridges often does not have the conditions for filling cofferdams, constructing river supports, having side hoisting work surfaces, or having overall installation construction conditions due to the impact of river flood control. Under various adverse external conditions, on the premise of ensuring safety and quality, how to quickly and economically install large-span urban steel structure bridges is a topic worthy of in-depth study.

[0003] When the river is wide and it is impossible to erect a crane, how to construct a large-span steel structure bridge has become an urgent problem to be solved. Summary of the Invention

[0004] The purpose of this application is to provide a rapid construction method for incremental launching, hoisting and closure of a super-wide steel box girder across a river to improve the problem of inconvenient construction of large-span steel structure bridges.

[0005] In the first aspect, a rapid construction method for incremental launching, hoisting and closure of a super-wide steel box girder across a river provided by this application adopts the following technical solutions: A rapid construction method for incremental launching, hoisting and closure of a super-wide steel box girder across a river includes the following steps: S1. Level the installation site and harden the foundation, and then complete the construction of the incremental launching support and assembly support for the first incremental launching beam section through a crawler crane; S2. Complete the installation of the steel box girder beam section of the first incremental launching beam section through a crawler crane; S3. Complete the construction of the remaining incremental launching supports and assembly supports through a crawler crane, and then complete the hoisting construction of the guide beam through a crawler crane; S4. The crawler crane completes the installation of the remaining beam sections and the guide beam of the first incremental launching steel box girder section on the front bench terrace and the back of the bench; S5. After the welding of the first incremental launching beam section is completed, it is pushed forward by 24 m; S6. The crawler crane hoists the steel box girder beam section for the second round of incremental launching on the back of the bench and joins it with the first incremental launching beam section to form an integral body; S7. After the welding of the second round of beam sections is completed, it is pushed forward by 24 m; S8. Repeat steps S6 and S7 to complete the installation and incremental launching of all beam sections; S9. Demolish the guide beam. The crawler crane hoists the first and last beam segments at the back of both abutments respectively, and demolishes the assembly brackets. After the structure is completed, lower the beam by using the jacking brackets and jacks, and finally demolish the jacking brackets.

[0006] By adopting the above technical solution, installation of assembly brackets is carried out to assemble multiple steel box girders. At the same time, the assembly brackets play a role in supporting the steel box girders. Subsequently, a guide beam is installed at the front section of the first top steel box girder so that the guide beam contacts the assembly brackets on the opposite bank of the river first during jacking, playing a role in stable support and preventing tipping. Jacking is achieved through the jacking brackets. The jacking brackets first lift the steel box girder to be jacked, and then push the steel box girder forward by a certain distance. Subsequently, the jacking brackets sink and the pushed part is reset, and then the above steps are repeated until the steel box girder is jacked to the set position. When jacking, a new steel box girder is added every time a certain distance is jacked at one end until all the steel box girders are jacked to the set position. At this time, install the first and last ends to complete the assembly of the main beam part of the entire bridge. The overall process is relatively convenient and safe, greatly improving the construction efficiency.

[0007] Optionally, the jacking bracket includes a support frame, a first jack, a second jack and a sliding seat. The first jack is fixedly installed at the bottom of the support frame in the vertical direction, the second jack is fixedly installed on the support frame in the horizontal direction, and the movable end of the second jack is connected to the sliding seat.

[0008] By the above technical solution, the support frame is lifted by the first jack, and then the steel box girder is lifted. The second jack facilitates the movement of the sliding seat, and then the steel box girder is pushed forward.

[0009] Optionally, two guide rails are provided on the support frame along the moving direction of the movable end of the second jack. The two guide rails are arranged on both sides of the sliding seat, and the sliding seat is slidably connected to both guide rails at the same time.

[0010] By the above technical solution, the sliding seat is guided by the guide rails, improving the stability and sliding accuracy of the sliding seat, and then achieving precise propulsion.

[0011] Optionally, a top plate is provided on the sliding seat. A damping plate is provided at the bottom of the top plate. A damping groove for inserting the damping plate is provided on the sliding seat, and a damping component is provided between the damping plate and the damping groove.

[0012] By the above technical solution, the top plate is damped by the damping component, reducing the influence of vibration on the propulsion of the steel box girder and further improving the propulsion accuracy.

[0013] Optionally, the damping component includes a damper and a damping spring. One end of the damper is connected to the damping plate, and the other end is connected to the side wall of the damping groove. One end of the damping spring abuts against the damping plate, and the other end abuts against the side wall of the damping groove.

[0014] Through the above technical solution, through the cooperation of the damper and the vibration damping spring, buffering and energy absorption of the top plate are achieved, thereby achieving vibration damping.

[0015] Optionally, the damper includes a shaft rod and a sleeve rod. A buffer hole for inserting the shaft rod is provided on the sleeve rod, and a non-Newtonian fluid is filled in the buffer hole.

[0016] By adopting the above technical solution, the non-Newtonian fluid can better achieve buffering. At the same time, whether the shaft rod approaches or moves away from the shaft sleeve, when the instantaneous displacement is large, the shaft rod will be subject to the resistance from the non-Newtonian fluid, further enhancing the effect of buffering and energy absorption, thereby ensuring the vibration damping effect.

[0017] Optionally, a first moving cavity and a second moving cavity are provided inside the first jack. A first piston slides inside the first moving cavity. The top of the first piston is connected to a jacking rod for connecting with the support frame. A second piston slides inside the second moving cavity. The top of the second piston extends out of the second moving cavity. A first electric cylinder is further connected outside the first jack. The moving end of the first electric cylinder is connected to the part of the second piston extending out of the second moving cavity; A storage oil cavity is further provided inside the first jack. The storage oil cavity is communicated with both the first moving cavity and the second moving cavity. A first one-way valve is provided between the storage oil cavity and the first moving cavity. The first one-way valve allows the oil fluid to only flow from the storage oil cavity to the first moving cavity. A second one-way valve is provided between the storage oil cavity and the second moving cavity. The second one-way valve allows the oil fluid to only flow from the second moving cavity to the storage oil cavity. The first moving cavity and the second moving cavity are communicated with each other. A third one-way valve is provided between the first moving cavity and the second moving cavity. The third one-way valve allows the oil fluid to only flow from the second moving cavity to the first moving cavity.

[0018] By adopting the above technical solution, when the first jack works, the moving end of the electric cylinder drives the second piston to move upward. At this time, the oil fluid in the oil storage tank is sucked into the second moving cavity. Subsequently, the moving end of the electric cylinder drives the second piston to move downward. The second piston presses the oil fluid in the second moving cavity into the first moving cavity to push the first piston to move upward, thereby realizing the upward movement of the jacking to push the support frame to jack up.

[0019] Optionally, a reset oil cylinder is connected to the support frame. A third piston is provided inside the reset oil cylinder. A reset rod is provided on the third piston. The reset rod extends out of the reset oil cylinder and is connected to the sliding seat.

[0020] By the above technical solution, the structure of the second jack is basically the same as that of the first jack. However, when the first jack is reset, it can be achieved by the self-weight of the steel box girder and the support frame. However, since the second jack is horizontally placed, it cannot be reset autonomously. At this time, the reset rod of the reset oil cylinder drives the sliding seat to reset.

[0021] Optionally, an oil outlet cavity is provided on the first jack. The oil outlet cavity is communicated with the first movable cavity. The second one-way valve is arranged between the oil outlet cavity and the first movable cavity. A plug is arranged in the oil outlet cavity. A lead-out cavity is formed in the side wall of the oil outlet cavity. One end of the lead-out cavity far away from the oil outlet cavity is communicated with the reset oil cylinder. The plug has a blocking state and a lead-out state. When the plug is in the blocking state, the plug blocks the lead-out cavity. When the plug is in the lead-out state, the lead-out cavity is communicated with the oil outlet cavity.

[0022] By adopting the above technical solution, when the first jack needs to be lifted, the plug blocks the lead-out cavity to prevent the oil from flowing out, so as to maintain the lifted state. When the first jack needs to be reset, the plug gives way, and the lead-out cavity is communicated with the oil outlet cavity. At this time, the oil flows out from the first movable cavity, and the first piston resets. At the same time, the discharged oil can be introduced into the reset oil cylinder as the power of the reset oil cylinder, realizing the utilization of the self-weight of the steel box girder and the support frame and reducing the power cost of the reset oil cylinder.

[0023] Optionally, a moving oil cavity is provided in the reset oil cylinder. An oil inlet and an oil outlet are provided on the side wall of the moving oil cavity. The oil inlet is communicated with the lead-out cavity, and the oil outlet is communicated with the oil storage cavity.

[0024] By adopting the above technical solution, the oil in the oil outlet cavity enters the moving oil cavity through the oil inlet, pushing the third piston to move. When the slide seat resets, the oil outlet just coincides with the oil inlet in the same area. At this time, the oil returns to the oil storage tank from the oil outlet, realizing circulation. In summary, the present application includes at least one of the following beneficial technical effects: 1. By installing an assembly support to assemble multiple steel box girders, and at the same time the assembly support plays a role in supporting the steel box girder. Then, a guide beam is installed at the front section of the first steel box girder to ensure that the guide beam contacts the assembly support on the opposite bank of the river first during jacking, playing a role in stable support and preventing tipping. The jacking is realized through the jacking support. The jacking support first jacks up the steel box girder to be jacked, and then advances the steel box girder a certain distance. Then the jacking support sinks, and the advancing part resets. Then the foregoing steps are repeated until the steel box girder is jacked to the set position. When new steel box girders are added every time a certain distance is jacked during the jacking process until all the steel box girders are jacked to the set position, and then the head and tail ends are installed to complete the assembly of the main beam part of the whole bridge. The whole process is relatively convenient and safe, greatly improving the construction efficiency. 2. The first jack is used to lift the support frame, and then the steel box girder is lifted. The second jack is convenient for pushing the slide seat to move, and then the steel box girder is advanced. 3. Vibration reduction components are used to reduce vibration of the top plate, thereby reducing the impact of vibration on the advancement of the steel box girder and further improving the advancement accuracy; 4. The damper and the damping spring cooperate to achieve buffering and energy absorption for the top plate, thereby achieving vibration reduction. The non-Newtonian fluid can achieve better buffering. At the same time, no matter whether the shaft is close to or far away from the sleeve, when the instantaneous displacement is large, the shaft will be subject to resistance from the non-Newtonian fluid, further improving the buffering and energy absorption effect, thereby ensuring the vibration reduction effect. 5. When the first jack is working, the movable end of the electric cylinder drives the second piston to move upward. At this time, the oil in the oil storage tank is sucked into the second movable chamber. Then the movable end of the electric cylinder drives the second piston to move downward. The second piston presses the oil in the second movable chamber into the first movable chamber to push the first piston upward, thereby realizing the upward movement of the jacking to push the support frame to lift; 6. The structure of the second jack is basically the same as that of the first jack, but the first jack can be reset by the deadweight of the steel box girder and the support frame. However, the second jack cannot be reset by itself because it is placed horizontally. At this time, the reset rod of the reset cylinder drives the slide to reset; 7. When the first jack needs to be lifted, the sealing plug will seal the outlet cavity to prevent the oil from flowing out, so as to maintain the lifting state. When the first jack needs to be reset, the sealing plug will give way, and the outlet cavity will be connected with the oil outlet cavity. At this time, the oil will be discharged from the first active cavity, and the first piston will be reset. At the same time, the discharged oil can be introduced into the reset cylinder as the power of the reset cylinder, so as to realize the utilization of the deadweight of the steel box girder and the support frame and reduce the power cost of the reset cylinder. 8. The oil in the oil outlet chamber enters the moving oil chamber through the oil inlet, pushing the third piston to move. When the slide is reset, the oil outlet is just in the same area as the oil inlet. At this time, the oil returns to the oil storage tank from the oil outlet to achieve circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a top view schematic diagram showing the distribution of the assembly bracket and the jacking bracket in the present invention.

[0026] Figure 2 It is a side view schematic diagram embodying the assembled bracket and the steel box girder in the present invention.

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the push support in the present invention.

[0028] Figure 4 It is a schematic cross-sectional view of the shock absorbing assembly in the present invention.

[0029] Figure 5 It is a schematic diagram of the cutaway structure of the first jack in the present invention.

[0030] Figure 6It is a schematic diagram showing the reset oil cylinder in the present invention.

[0031] Figure 7 It is a front view schematic diagram showing the main arch in the present invention.

[0032] Figure 8 It is a three-dimensional structure schematic diagram showing the middle section in the present invention..

[0033] Figure 9 It is a three-dimensional structure schematic diagram showing the temporary support in the present invention.

[0034] Figure 10 It is a sectional structure schematic diagram showing the ejector rod in the present invention.

[0035] Figure 11 It is a schematic diagram showing the spreader in the present invention.

[0036] In the figure, 1, assembly support; 2, jacking support; 21, support frame; 22, first jack; 221, first moving cavity; 222, second moving cavity; 223, first piston; 224, second piston; 2241, electric cylinder; 225, oil storage cavity; 226, first one-way valve; 227, second one-way valve; 228, third one-way valve; 229, oil outlet cavity; 2291, export cavity; 2292, sealing plug; 23, second jack; 231, reset oil cylinder; 232, third piston; 233, reset rod; 234, moving oil cavity; 2341, oil inlet; 2342, oil outlet; 24, sliding seat; 241, damping groove; 25, guide rail; 26, damping assembly; 261, damper; 2611, shaft rod; 2612, sleeve rod; 262, damping spring; 27, top plate; 271, damping plate; 3, steel box girder; 4, main arch; 41, middle section; 411, outer shell; 412, reinforcing piece; 413, reinforcing plate; 42, side section; 5, temporary support; 51, fixed frame; 52, adjusting part; 521, positioning inclined surface; 522, positioning groove; 523, sliding groove; 524, limiting step; 525, sliding piece; 526, connecting rod; 527, ejector rod; 528, tension spring; 6, spreader; 61, upper hook assembly; 611, inclined hook; 62, lower pressing assembly; 621, lower pressing rod; 622, fitting plate; 623, lower pressing spring; 7, suspender. Detailed implementation manners

[0037] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only showing the basic structure of the present invention in a schematic way, so they only show the components related to the present invention.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention 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. Therefore, it should not be construed as a limitation to the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Embodiment 1 In a first aspect, the present application discloses a rapid construction method for launching, hoisting and closing a super-wide steel box girder across a river.

[0040] A rapid construction method for launching, hoisting and closing a super-wide steel box girder across a river, with reference to Figures 1 to 2 , a rapid construction method for launching, hoisting and closing a super-wide steel box girder 3 across a river, comprising the following steps: S1. Level the installation site and harden the foundation, and then complete the construction of the launching support 2 and the assembly support 1 for the first launched girder section by a crawler crane. The first launched girder section is the girder section that is first launched towards the opposite bank of the river.

[0041] S2. Complete the installation of the steel box girder 3 section of the first launched girder section by a crawler crane.

[0042] S3. Complete the construction of the remaining launching supports 2 and assembly supports 1 by a crawler crane, and then complete the hoisting construction of the falsework by a crawler crane.

[0043] S4. The crawler crane completes the installation of the remaining sections of the first launched steel box girder 3 and the falsework on the front terrace and the back of the abutment.

[0044] S5. After the welding of the first launched girder section is completed, it is launched forward by 24 m.

[0045] S6. The crawler crane hoists the steel box girder 3 section for the second round of launching at the back of the abutment and joins it with the first launched girder section to form an integral body.

[0046] S7. After the welding of the second secondary girder segment is completed, it is jacked forward by 24 m.

[0047] S8. Repeat steps S6 and S7 to complete the installation and jacking of all girder segments.

[0048] S9. Remove the guide girder. The crawler crane hoists the head and tail girder segments at the two side abutments respectively, and removes the assembly support 1. After the structure is completed, lower the girder by using the jacking support 2 and the jack, and finally remove the jacking support 2.

[0049] By installing the assembly support 1 to assemble multiple steel box girders 3, and at the same time, the assembly support 1 plays a role in supporting the steel box girder 3. Subsequently, install a guide girder at the front section of the first jacked steel box girder 3 so that the guide girder contacts the assembly support 1 on the other side of the river first during jacking, playing a role in stable support and preventing tipping. The jacking is realized through the jacking support 2. The jacking support 2 first jacks up the steel box girder 3 to be jacked, and then advances the steel box girder 3 forward by a certain distance. Subsequently, the jacking support 2 sinks, and the advanced part is reset. Then repeat the above steps until the steel box girder 3 is jacked to the set position. When jacking, a new steel box girder 3 is added for each jacked distance until all steel box girders 3 are jacked to the set position. At this time, install the head and tail ends to complete the assembly of the main girder part of the entire bridge. The overall process is relatively convenient and safe, greatly improving the construction efficiency.

[0050] Refer to Figures 3 to 6 , the jacking support 2 includes a support frame 21, a first jack 22, a second jack 23 and a sliding seat 24. The first jack 22 is fixedly installed at the bottom of the support frame 21 in the vertical direction, the second jack 23 is fixedly installed on the support frame 21 in the horizontal direction, and the movable end of the second jack 23 is connected to the sliding seat 24. The first jack 22 is used to lift the support frame 21, and thus lift the steel box girder 3. The second jack 23 facilitates the movement of the sliding seat 24, and thus realizes the advancement of the steel box girder 3.

[0051] Specifically, the support frame 21 is provided with two guide rails 25 along the moving direction of the movable end of the second jack 23. The two guide rails 25 are arranged on both sides of the sliding seat 24, and the sliding seat 24 is simultaneously slidably connected to the two guide rails 25. The guide rails 25 are used to guide the sliding seat 24, improve the stability and sliding accuracy of the sliding seat 24 during sliding, and thus realize precise advancement.

[0052] The sliding seat 24 is provided with a top plate 27. A vibration damping plate 271 is provided at the bottom of the top plate 27. A vibration damping groove for inserting the vibration damping plate 271 is opened on the sliding seat 24. A vibration damping component 26 is provided between the vibration damping plate 271 and the vibration damping groove. The vibration damping component 26 is used to damp the top plate 27, reduce the influence of vibration on the advancement of the steel box girder 3, and further improve the advancement accuracy.

[0053] The shock absorption assembly 26 includes a damper 261 and a shock absorption spring 262. One end of the damper 261 is connected to the shock absorption plate 271, and the other end is connected to the side wall of the shock absorption groove. One end of the shock absorption spring 262 abuts against the shock absorption plate 271, and the other end abuts against the side wall of the shock absorption groove. Through the cooperation of the damper 261 and the shock absorption spring 262, buffering and energy absorption are achieved for the top plate 27, and thus shock absorption is realized. The shock absorption spring 262 can be a compression spring or a tension spring.

[0054] The damper 261 includes a shaft rod 2611 and a sleeve rod 2612. A buffer hole for the shaft rod 2611 to insert is provided on the sleeve rod 2612, and a non-Newtonian fluid is filled in the buffer hole. The non-Newtonian fluid can better achieve buffering. At the same time, whether the shaft rod 2611 approaches or moves away from the shaft sleeve, when the instantaneous displacement is large, the shaft rod 2611 will be subject to the resistance from the non-Newtonian fluid, further improving the effect of buffering and energy absorption, and thus ensuring the shock absorption effect.

[0055] The first jack 22 is provided with a first movable cavity 221 and a second movable cavity 222. A first piston 223 slides in the first movable cavity 221. The top of the first piston 223 is connected with a jacking rod for connecting with the support frame 21. A second piston 224 slides in the second movable cavity 222. The top of the second piston 224 extends out of the second movable cavity 222. A first electric cylinder 2241 is also connected outside the first jack 22, and the movable end of the first electric cylinder 2241 is connected with the part of the second piston 224 extending out of the second movable cavity 222.

[0056] The first jack 22 is also provided with an oil storage cavity 225. The oil storage cavity 225 is communicated with both the first movable cavity 221 and the second movable cavity 222. A first one-way valve 226 is provided between the oil storage cavity 225 and the first movable cavity 221, and the first one-way valve 226 enables the oil fluid to only flow from the oil storage cavity 225 to the first movable cavity 221. A second one-way valve 227 is provided between the oil storage cavity 225 and the second movable cavity 222, and the second one-way valve 227 enables the oil fluid to only flow from the second movable cavity 222 to the oil storage cavity 225. The first movable cavity 221 and the second movable cavity 222 are communicated with each other, and a third one-way valve 228 is provided between the first movable cavity 221 and the second movable cavity 222, and the third one-way valve 228 enables the oil fluid to only flow from the second movable cavity 222 to the first movable cavity 221. When the first jack 22 works, the movable end of the electric cylinder 2241 drives the second piston 224 to move upward. At this time, the oil fluid in the oil storage tank is sucked into the second movable cavity 222. Subsequently, the movable end of the electric cylinder 2241 drives the second piston 224 to move downward, and the second piston 224 presses the oil fluid in the second movable cavity 222 into the first movable cavity 221 to push the first piston 223 to move upward, so as to realize the upward movement of the jacking and push the support frame 21 to be jacked up.

[0057] In addition, a reset oil cylinder 231 is connected to the support frame 21. A third piston 232 is arranged in the reset oil cylinder 231. A reset rod 233 is provided on the third piston 232. The reset rod 233 extends out of the reset oil cylinder 231 and is connected to the sliding seat 24. The structure of the second jack 23 is basically the same as that of the first jack 22. However, when the first jack 22 is reset, it can be achieved by the self-weight of the steel box girder 3 and the support frame 21. But since the second jack 23 is horizontally placed, it cannot be reset automatically. At this time, the sliding seat 24 is driven to reset by the reset rod 233 of the reset oil cylinder 231.

[0058] More specifically, an oil outlet cavity 229 is provided on the first jack 22. The oil outlet cavity 229 is communicated with the first moving cavity 221. A second one-way valve 227 is arranged between the oil outlet cavity 229 and the first moving cavity 221. A plug 2292 is arranged in the oil outlet cavity 229. A lead-out cavity 2291 is formed on the side wall of the oil outlet cavity 229. One end of the lead-out cavity 2291 far away from the oil outlet cavity 229 is communicated with the reset oil cylinder 231. The plug 2292 has a blocking state and a leading-out state. When the plug 2292 is in the blocking state, the plug 2292 blocks the lead-out cavity 2291. When the plug 2292 is in the leading-out state, the lead-out cavity 2291 is communicated with the oil outlet cavity 229. When the first jack 22 needs to be lifted, the plug 2292 blocks the lead-out cavity 2291 to prevent the oil from flowing out so as to maintain the lifted state. When the first jack 22 needs to be reset, the plug 2292 gives way, and the lead-out cavity 2291 is communicated with the oil outlet cavity 229. At this time, the oil flows out from the first moving cavity 221, and the first piston 223 is reset. At the same time, the discharged oil can be introduced into the reset oil cylinder 231 as the power of the reset oil cylinder 231, realizing the utilization of the self-weight of the steel box girder 3 and the support frame 21 and reducing the power cost of the reset oil cylinder 231.

[0059] A moving oil cavity 234 is arranged in the reset oil cylinder 231. An oil inlet 2341 and an oil outlet 2342 are arranged on the side wall of the moving oil cavity 234. The oil inlet 2341 is communicated with the lead-out cavity 2291, and the oil outlet 2342 is communicated with the oil storage cavity 225. The oil in the oil outlet cavity 229 enters the moving oil cavity 234 through the oil inlet 2341 to push the third piston 232 to move. When the sliding seat 24 is reset, the oil outlet 2342 just falls into the same area as the oil inlet 2341. At this time, the oil returns to the oil storage tank from the oil outlet 2342 to realize circulation.

[0060] It should be noted that the plug 2292 can be driven by an electric cylinder 2241 or designed to be threadedly connected to the oil outlet cavity 229 and driven manually by an operator.

[0061] In a second aspect, the present application discloses a large-deflection beam-lowering construction method for a long-span UHPC steel box composite simply-supported bridge.

[0062] A large deflection beam drop construction method for a long-span UHPC steel box composite simply supported bridge, referring to Figure 7 , including the following steps: S1. Divide the main arch 4 into two side segments 42 and a plurality of middle segments 41, install the two side segments 42 on the bridge deck, and consolidate them with the main beam.

[0063] S2. Temporary support brackets are installed on the bridge deck, and several groups of temporary support brackets are arranged along the length direction of the main arch 4.

[0064] S3, hoisting the middle section 41 by means of a crawler crane, so that several middle sections 41 fall on corresponding temporary support brackets, connecting the middle section 41 with the side section 42 and between adjacent middle sections 41 to form the main arch 4.

[0065] When hoisting the middle section 41, hoist symmetrically from both sides to the middle, and finally close in the middle of the span. Hoist from both sides to the middle, and after hoisting, the hoisted middle section 41 can be directly connected to the side section 42 or the front middle section 41 to ensure safety. Symmetry means that the hoisting progress on both sides is similar. After hoisting one on one side, hoist one on the opposite side immediately to ensure the stability of the counterweights on both sides and further ensure the safety of hoisting. S4. Install the hanger 7 between the main arch 4 and the bridge deck.

[0066] S5. Remove the temporary support bracket.

[0067] A crawler crane is used to adapt to the narrow space of the bridge deck, and then the middle sections 41 are hoisted one by one onto the temporary support 5. The temporary support 5 supports the middle sections 41 so that the middle sections 41 and the side sections 42 and the adjacent middle sections 41 can be connected to each other, and finally the entire main arch 4 is assembled. The problem of difficult construction of the large-span main arch 4 is solved by hoisting and reassembling in sections.

[0068] Reference Figure 8 The middle section 41 includes a shell 411, a reinforcing sheet 412 and a reinforcing plate 413. The reinforcing sheet 412 is fixedly connected to the inner side of the shell 411 and is provided with a plurality of reinforcing plates along the length direction of the shell 411. The reinforcing plates 413 are fixedly connected to the shell 411 and the reinforcing sheet 412 at the same time. The reinforcing plates 413 are provided with a plurality of reinforcing plates 413 along the circumference direction of the reinforcing sheet 412. The shell 411 is reinforced by the reinforcing sheet 412 and the reinforcing plate 413 to improve the overall strength of the main arch 4. At the same time, the reinforcing sheet 412 is also convenient for installing the suspension rod 7.

[0069] Reference Figures 9 to 11The temporary support 5 includes a fixed frame 51 and an adjusting portion 52 disposed on the fixed frame 51. The adjusting portion 52 has a positioning inclined surface 521, which is used to contact the reinforcing sheet 412 to position the middle section 41 along the length direction of the main arch 4. The adjusting portion 52 is provided with a positioning groove 522, which is used for the reinforcing sheet 412 to be inserted to position the middle section 41 along the width direction of the main arch 4. The middle section 41 is positioned along the length direction of the main arch 4 by the positioning inclined surface 521, and is positioned along the width direction of the main arch 4 by the positioning groove 522, thereby determining the position of the middle section 41 installed on the temporary support 5, which is convenient for subsequent construction.

[0070] Specifically, a sliding groove 523 is provided on the bottom surface of the positioning groove 522, and a sliding sheet 525 slides in the sliding groove 523 along the vertical direction. The top of the sliding sheet 525 extends into the positioning groove 522 to contact the reinforcing plate 413, and the bottom of the sliding sheet 525 passes through the sliding groove 523 and is hinged with two connecting rods 526. The ends of the two connecting rods 526 away from the sliding sheet 525 are respectively hinged with a push rod 527. The two push rods 527 both slide horizontally in the adjusting portion 52, and the opposite ends of the two push rods 527 pass through the adjusting portion 52 to contact the inner side of the outer shell 411. When the middle section 41 falls, the reinforcing plate 413 at the middle position is inserted into the positioning groove 522 and contacts the sliding sheet 525. Then, the gravity of the middle section 41 presses the sliding sheet 525 downward. The downward movement of the sliding sheet 525 pushes the two top rods 527 to move away from each other, and makes the two top rods 527 press against the inner side of the outer shell 411 to improve the stability of the outer shell 411 falling on the temporary bracket 5.

[0071] A tension spring 528 is connected between the two push rods 527. The tension spring 528 is convenient for making the push rod 527 retract into the adjustment portion 52 when the middle section 41 is not below, so as to avoid interference with the middle section 41.

[0072] The adjusting portion 52 is provided with a limiting step 524, and the limiting step 524 is used to contact the lower end surface of the housing 411. The limiting step 524 is used to abut against the housing 411 to further position the housing 411.

[0073] It should be noted that each middle section 41 is supported by two adjusting parts 52. The limiting step 524 is provided on the adjusting part 52 located at the bottom so as to support the housing 411 and prevent the housing 411 from falling.

[0074] In addition, a lifting tool 6 is connected to the hook of the crawler crane. A downward pressing component 62 and an upper hook component 61 are connected to the lifting tool 6. The downward pressing component 62 is used to press against the outer shell 411, and the upper hook component 61 is used to hook the outer shell 411. Through the cooperation of the downward pressing component 62 and the upper hook component 61, the stability of hoisting the middle section 41 can be improved, and at the same time, it is convenient to improve the hoisting accuracy. In this embodiment, there are two groups of upper hook components 61 and one group of downward pressing components 62, and the two groups of upper hook components 61 are located on both sides of the downward pressing component 62.

[0075] Specifically, the upper hook component 61 includes two inclined hooks 611. Both of the two inclined hooks 611 are hinged to the bottom of the lifting tool 6, and the two inclined hooks 611 are used to hook both sides of the outer shell 411. By hooking both sides of the outer shell 411 with the two inclined hooks 611, the outer shell 411 is prevented from falling.

[0076] The downward pressing component 62 includes a downward pressing rod 621 and a fitting plate 622. One end of the downward pressing rod 621 is fixedly connected to the lifting tool 6, and the other end is fixedly connected to the fitting plate 622. The fitting plate 622 is arranged to fit the outer surface of the outer shell 411; the downward pressing rod 621 is an extension rod, and a downward pressing spring 623 is sleeved on the downward pressing rod 621. One end of the downward pressing spring 623 abuts against the lifting tool 6, and the other end abuts against the fitting plate 622. By making the fitting plate 622 fit the outer shell 411, and then using the downward pressing spring 623 to press the fitting plate 622, the middle section 41 is clamped by the fitting plate 622 and the inclined hook 611 to be in a stable state. The downward pressing spring 623 is a compression spring.

[0077] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same components are denoted by the same reference numerals. Therefore: Any equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A rapid construction method for jacking, hoisting and closing of a super-wide steel box girder across a river, characterized in that, It includes the following steps: S1. Level the installation site and harden the foundation, and then complete the construction of the jacking support (2) and the assembly support (1) for the first top beam section by crawler crane; S2. Complete the installation of the steel box girder (3) section of the first top beam section by crawler crane; S3. Complete the construction of the remaining jacking supports (2) and assembly supports (1) by crawler crane, and then complete the hoisting construction of the guide beam by crawler crane; S4. The crawler crane completes the installation of the remaining beam sections of the first top steel box girder (3) and the guide beam on the front terrace and the back of the abutment; S5. After the welding of the first top beam section is completed, jack it forward by 24 m; S6. The crawler crane hoists the steel box girder (3) section for the second round of jacking on the back of the abutment and spliced it with the first top beam section to form an integral body; S7. After the welding of the second round of beam sections is completed, jack it forward by 24 m; S8. Repeat steps S6 and S7 to complete the installation and jacking of all beam sections; S9. Demolish the guide beam, the crawler crane hoists the head and tail beam sections on both sides of the back of the abutment respectively, and demolish the assembly support (1); after the structure is completed, use the jacking support (2) and the jack to lower the beam, and finally demolish the jacking support (2).

2. The rapid construction method for jacking, hoisting and closure of a super-wide steel box girder across a river according to claim 1, wherein: The jacking support (2) includes a support frame (21), a first jack (22), a second jack (23) and a sliding seat (24). The first jack (22) is fixedly installed at the bottom of the support frame (21) in the vertical direction. The second jack (23) is fixedly installed on the support frame (21) in the horizontal direction. The movable end of the second jack (23) is connected to the sliding seat (24), and the sliding seat (24) is used to support the steel box girder (3).

3. A rapid construction method for the jacking, hoisting and closure of a super-wide steel box girder across a river according to claim 2, characterized in that: Two guide rails (25) are arranged on the support frame (21) along the moving direction of the movable end of the second jack (23). The two guide rails (25) are arranged on both sides of the sliding seat (24), and the sliding seat (24) is simultaneously slidably connected to the two guide rails (25).

4. A rapid construction method for the jacking, hoisting and closure of a super-wide steel box girder across a river according to claim 3, characterized in that: A top plate (27) is arranged on the sliding seat (24). The top plate (27) is used to contact the bottom of the steel box girder (3). A damping plate (271) is arranged at the bottom of the top plate (27). A damping groove for inserting the damping plate (271) is formed on the sliding seat (24), and a damping component (26) is arranged between the damping plate (271) and the damping groove.

5. A rapid construction method for jacking, hoisting and closing of a super-wide steel box girder across a river according to claim 4, characterized in that: The damping component (26) includes a damper (261) and a damping spring (262). One end of the damper (261) is connected to the damping plate (271), and the other end is connected to the side wall of the damping groove. One end of the damping spring (262) abuts against the damping plate (271), and the other end abuts against the side wall of the damping groove.

6. The rapid construction method for pushing, hoisting and closing of a super-wide steel box girder across a river according to claim 5, characterized in that: The damper (261) includes a shaft rod (2611) and a sleeve rod (2612). A buffer hole for inserting the shaft rod (2611) is formed on the sleeve rod (2612), and the buffer hole is filled with non-Newtonian fluid.

7. A rapid construction method for the jacking, hoisting and closure of a super-wide steel box girder across a river according to claim 6, characterized in that: The first jack (22) is provided with a first movable cavity (221) and a second movable cavity (222). A first piston (223) slides in the first movable cavity (221). The top of the first piston (223) is connected to a jacking rod for connecting with the support frame (21). A second piston (224) slides in the second movable cavity (222). The top of the second piston (224) extends out of the second movable cavity (222). A first electric cylinder (2241) is also connected to the outside of the first jack (22). The movable end of the first electric cylinder (2241) is connected to the part of the second piston (224) that extends out of the second movable cavity (222). The first jack (22) is further provided with an oil storage cavity (225). The oil storage cavity (225) is communicated with both the first movable cavity (221) and the second movable cavity (222). A first one-way valve (226) is arranged between the oil storage cavity (225) and the first movable cavity (221). The first one-way valve (226) allows the oil to flow only from the oil storage cavity (225) to the first movable cavity (221). A second one-way valve (227) is arranged between the oil storage cavity (225) and the second movable cavity (222). The second one-way valve (227) allows the oil to flow only from the second movable cavity (222) to the oil storage cavity (225). The first movable cavity (221) is communicated with the second movable cavity (222). A third one-way valve (228) is arranged between the first movable cavity (221) and the second movable cavity (222). The third one-way valve (228) allows the oil to flow only from the second movable cavity (222) to the first movable cavity (221).

8. A rapid construction method for launching, hoisting and closing a super-wide steel box girder across a river according to claim 7, characterized in that: A reset oil cylinder (231) is connected to the support frame (21). A third piston (232) is arranged in the reset oil cylinder (231). A reset rod (233) is provided on the third piston (232). The reset rod (233) extends out of the reset oil cylinder (231) and is connected to the sliding seat (24).

9. A rapid construction method for the jacking, hoisting and closure of a super-wide steel box girder across a river according to claim 8, characterized in that: An oil outlet cavity (229) is arranged on the first jack (22). The oil outlet cavity (229) is communicated with the first movable cavity (221). The second one-way valve (227) is arranged between the oil outlet cavity (229) and the first movable cavity (221). A plug (2292) is arranged in the oil outlet cavity (229). A lead-out cavity (2291) is formed on the side wall of the oil outlet cavity (229). One end of the lead-out cavity (2291) far away from the oil outlet cavity (229) is communicated with the reset oil cylinder (231). The plug (2292) has a blocking state and a lead-out state. When the plug (2292) is in the blocking state, the plug (2292) blocks the lead-out cavity (2291). When the plug (2292) is in the lead-out state, the lead-out cavity (2291) is communicated with the oil outlet cavity (229).

10. A rapid construction method for jacking, hoisting and closing a cross-river ultra-wide steel box girder according to claim 9, characterized in that: A movement oil chamber (234) is provided in the reset oil cylinder (231). An oil inlet (2341) and an oil outlet (2342) are provided on the side wall of the movement oil chamber (234). The oil inlet (2341) is communicated with the derivation chamber (2291), and the oil outlet (2342) is communicated with the oil storage chamber (225).

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