Large-span UHPC (Ultra High Performance Concrete) steel box combined simply supported bridge large-deflection beam falling construction method

Abstract

The invention discloses a large-span UHPC steel box combined simply-supported bridge large-deflection beam falling construction method which comprises the following steps that S1, a main arch is divided into two side sections and a plurality of middle sections, and the two side sections are installed on a bridge floor and fixedly connected with a main beam; s2, mounting a plurality of groups of temporary support brackets on the bridge floor along the length direction of the main arch; s3, the middle sections are hoisted through a crawler crane, so that the middle sections are located on the corresponding temporary supporting brackets, the middle sections and the side sections are connected, the adjacent middle sections are connected, and a main arch is formed through splicing; s4, suspenders are installed between the main arch and the bridge floor; and S5, dismantling the temporary supporting bracket. The crawler crane is utilized to adapt to the narrow space of the bridge floor, the middle sections are hoisted to the temporary supports, so that the middle sections and the side sections as well as the adjacent middle sections are connected and spliced to form the whole main arch, and the problem that the large-span main arch is difficult to construct is solved in a segmented hoisting and reassembling mode.

Description

Technical Field

[0001] The present application relates to the technical field of bridge construction, and in particular to a large-deflection beam-dropping construction method for a large-span UHPC steel box composite simply supported bridge. Background Art

[0002] With the development of bridge construction technology, steel structures have become the first choice for large-span and landscape bridges due to their light weight, high structural strength, and strong plasticity. With the development of material technology, UHPC (ultra-high performance concrete) can form a combined force system with the top plate of steel structure bridges to participate in structural force and assume the function of bridge deck pavement base. In recent years, steel-UHPC lightweight composite bridge deck technology has been more and more widely used.

[0003] After the construction of the main beam and UHPC concrete part of the bridge is completed, it is necessary to construct the main arch on the bridge deck and then connect it to the bridge through hangers to apply stress to the bridge as a whole. However, due to the limited bridge deck space and the large span of the main arch (more than 100 meters), the construction of the main arch is more troublesome, so a new construction method is urgently needed. Summary of the invention

[0004] The purpose of this application is to provide a large-deflection beam-dropping construction method for a large-span UHPC steel box composite simply supported bridge, so as to improve the problem of difficulty in the construction of a large-span main arch.

[0005] In the first aspect, the present application provides a large-span UHPC steel box composite simply supported bridge large deflection beam drop construction method, which adopts the following technical solution: A large-deflection beam-dropping construction method for a large-span UHPC steel box composite simply supported bridge comprises the following steps: S1. Divide the main arch into two side sections and several middle sections, install the two side sections on the bridge deck, and consolidate them with the main beam; S2. Install temporary support brackets on the bridge deck, with several groups of temporary support brackets arranged along the length direction of the main arch; S3, hoisting the middle sections by crawler crane, so that several middle sections fall on corresponding temporary support brackets, connecting the middle sections with side sections, and between adjacent middle sections, so as to form a main arch; S4. Install the hanger between the main arch and the bridge deck; S5. Remove the temporary support bracket.

[0006] By adopting the above technical solution, a crawler crane is used to adapt to the narrow space of the bridge deck, and then the middle sections are hoisted one by one onto the temporary supports. The middle sections are supported by the temporary supports so as to connect the middle sections with the side sections and adjacent middle sections with each other. Finally, the entire main arch is assembled, and the problem of difficult construction of the long-span main arch is solved by the method of segmented hoisting and then assembly.

[0007] Optionally, in step S3, when hoisting the middle sections, hoist symmetrically from both sides to the middle and finally close at the mid-span.

[0008] By the above technical solution, hoisting from both sides to the middle, after hoisting, the hoisted middle sections can be directly connected to the side sections or the previous middle sections, ensuring safety. Symmetry means that the hoisting progress on both sides is the same. After hoisting one on one side, immediately hoist one on the opposite side to ensure the stability of the counterweights on both sides and further ensure the safety of hoisting.

[0009] Optionally, the middle section includes a housing, reinforcing pieces and reinforcing plates. The reinforcing pieces are fixedly connected to the inner side of the housing and are provided with a plurality along the length direction of the housing. The reinforcing plates are fixedly connected to both the housing and the reinforcing pieces at the same time, and a plurality of the reinforcing plates are provided along the circumferential direction of the reinforcing pieces.

[0010] By the above technical solution, the housing is strengthened by the reinforcing pieces and the reinforcing plates, improving the overall strength of the main arch. At the same time, the reinforcing pieces are also convenient for installing the suspender rods.

[0011] Optionally, the temporary support includes a fixed frame and an adjusting part arranged on the fixed frame. The adjusting part has a positioning inclined surface, and the positioning inclined surface is used to contact with the reinforcing piece to position the middle section along the length direction of the main arch. The adjusting part is provided with a positioning groove, and the positioning groove is used for the reinforcing piece to be inserted into it to position the middle section along the width direction of the main arch.

[0012] By the above technical solution, the middle section is positioned along the length direction of the main arch through the positioning inclined surface, and the middle section is positioned along the width direction of the main arch through the positioning groove, thereby determining the position of the middle section installed on the temporary support and facilitating subsequent construction.

[0013] Optionally, a sliding groove is opened on the bottom surface of the positioning groove. A sliding piece slides vertically in the sliding groove. The top of the sliding piece extends into the positioning groove to contact with the reinforcing plate. The bottom of the sliding piece passes through the sliding groove and is hinged with two connecting rods. One end of each of the two connecting rods away from the sliding piece is respectively hinged with a jacking rod. Both of the two jacking rods slide horizontally in the adjusting part, and the opposite ends of the two jacking rods pass through the adjusting part to contact with the inner side of the housing.

[0014] Through the above technical solution, when the middle section falls, the reinforcing plate in the middle position is inserted into the positioning groove and contacts the sliding piece. Then the gravity of the middle section presses the sliding piece downward. The downward movement of the sliding piece pushes the two top rods to move away from each other and makes the two top rods press against the inner side of the outer shell to improve the stability of the outer shell falling on the temporary bracket.

[0015] Optionally, a tension spring is connected between the two push rods.

[0016] By adopting the above technical solution, the tension spring can make the push rod retract into the adjustment part when the middle section is not lowered, so as to avoid interference with the middle section.

[0017] Optionally, a limiting step is provided on the adjusting portion, and the limiting step is used to contact the lower end surface of the shell.

[0018] By adopting the above technical solution, the limiting step is used to abut against the outer shell to further position the outer shell.

[0019] Optionally, a sling is connected to the hook of the crawler crane, and a downward pressure component and an upper hook component are connected to the sling, the downward pressure component is used to press the outer shell, and the upper hook component is used to hook the outer shell.

[0020] Through the above technical solution, through the cooperation of the lower pressure component and the upper hook component, the stability of the middle section of the hoisting can be improved, and at the same time it is easy to improve the hoisting accuracy.

[0021] Optionally, the upper hook assembly includes two oblique hooks, both of which are hinged to the bottom of the sling, and the two oblique hooks are used to hook two sides of the shell.

[0022] By adopting the above technical solution, two sides of the shell are hooked by two oblique hooks to prevent the shell from falling.

[0023] Optionally, the pressing assembly includes a pressing rod and a bonding plate, one end of the pressing rod is fixedly connected to the hanger, and the other end is fixedly connected to the bonding plate, and the bonding plate is arranged to bond to the outer surface of the shell; The pressing rod is a telescopic rod, and a pressing spring is sleeved on the pressing rod. One end of the pressing spring abuts against the hanger, and the other end abuts against the laminating plate.

[0024] By adopting the above technical solution, the bonding plate is bonded to the shell, and then the bonding plate is pressed by the downward spring, so that the middle section is clamped by the bonding plate and the oblique hook to be in a stable state.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. Utilize a crawler crane to adapt to the narrow space of the bridge deck, and then hoist the middle sections one by one onto the temporary supports. Support the middle sections through the temporary supports so as to connect the middle sections with the side sections and adjacent middle sections with each other, and finally assemble the entire main arch. Solve the problem of difficult construction of the long-span main arch by means of segmental hoisting and then assembly; 2. Hoist from both sides to the middle. After hoisting, the hoisted middle section can be directly connected to the side section or the previous middle section to ensure safety. Symmetry means that the hoisting progress on both sides is the same. After hoisting one on one side, immediately hoist one on the opposite side to ensure the stability of the counterweights on both sides and further ensure the safety of hoisting; 3. Strengthen the outer shell through the strengthening pieces and strengthening plates to improve the overall strength of the main arch. At the same time, the strengthening pieces are also convenient for installing the suspension rods; 4. Position the middle section along the length direction of the main arch through the positioning inclined plane, and position the middle section along the width direction of the main arch through the positioning groove, so as to determine the position of the middle section installed on the temporary support, which is convenient for subsequent construction; 5. When the middle section descends, the strengthening plate at the middle position inserts into the positioning groove and contacts the sliding piece. Subsequently, the gravity of the middle section presses down the sliding piece. The downward movement of the sliding piece pushes the two ejector rods to move away from each other and makes the two ejector rods abut against the inner side of the outer shell to improve the stability of the outer shell falling on the temporary support. The tension spring facilitates the ejector rods to retract into the adjusting part when the middle section has not descended, so as to avoid interference with the middle section; 6. Through the cooperation of the pressing component and the upper hook component, the stability of hoisting the middle section can be improved, and at the same time, it is convenient to improve the hoisting accuracy; 7. Hook the two inclined hooks on both sides of the outer shell to prevent the outer shell from falling; 8. Fit the fitting plate with the outer shell, and then use the pressing spring to press the fitting plate, so that the middle section is clamped by the fitting plate and the inclined hook to be in a stable state. Description of the Drawings

[0026] Figure 1 It is a top view schematic diagram showing the distribution of the assembly support and the jacking support in the present invention.

[0027] Figure 2 It is a side view schematic diagram showing the assembly support and the steel box girder in the present invention.

[0028] Figure 3 It is a three-dimensional structure schematic diagram showing the jacking support in the present invention..

[0029] Figure 4 It is a cross-sectional structure schematic diagram showing the shock absorption component in the present invention.

[0030] Figure 5 It is a sectional structure schematic diagram showing the first jack in the present invention.

[0031] Figure 6 This is a schematic diagram showing the reset oil cylinder in the present invention.

[0032] Figure 7 This is a front view schematic diagram showing the main arch in the present invention.

[0033] Figure 8 This is a three-dimensional structural schematic diagram showing the middle section in the present invention..

[0034] Figure 9 This is a three-dimensional structural schematic diagram showing the temporary support in the present invention.

[0035] Figure 10 This is a sectional structural schematic diagram showing the ejector rod in the present invention.

[0036] Figure 11 This is a schematic diagram showing the spreader in the present invention.

[0037] In the figure: 1, assembly support; 2, pushing 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, lead-out cavity; 2292, 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, shock absorption groove; 25, guide rail; 26, shock absorption assembly; 261, damper; 2611, shaft rod; 2612, sleeve rod; 262, shock absorption spring; 27, top plate; 271, shock absorption 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

[0038] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic way, so they only show the components related to the present invention.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship 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. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the 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 defined 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.

[0040] Embodiment 1 In a first aspect, the present application discloses a rapid construction method for launching, hoisting and closure of a super-wide steel box girder across a river.

[0041] Referring to Figures 1 to 2 , a rapid construction method for 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 launching support 2 for the first launched girder segment and the assembly support 1 by a crawler crane. The first launched girder segment is the girder segment that is first launched towards the opposite bank of the river.

[0042] S2. Complete the installation of the steel box girder 3 segment of the first launched girder segment by a crawler crane.

[0043] 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 guide girder by a crawler crane.

[0044] S4. The crawler crane completes the installation of the remaining segments of the first launched steel box girder 3 and the guide girder at the front terrace and the back of the abutment.

[0045] S5. After the welding of the first launched girder segment is completed, it is launched forward by 24 m.

[0046] S6. The crawler crane hoists the steel box girder 3 segments for the second round of launching at the back of the abutment and joins them with the first launched girder segment to form an integral body.

[0047] S7. After the welding of the second secondary beam section is completed, it is jacked forward by 24 m.

[0048] S8. Repeat steps S6 and S7 to complete the installation and jacking of all beam sections.

[0049] S9. Demolish the guide beam. The crawler crane hoists the first and last beam sections at both sides of the abutment back respectively, and demolish the assembly bracket 1. After the structure is completed, use the jacking bracket 2 and the jack to lower the beam, and finally demolish the jacking bracket 2.

[0050] By installing the assembly bracket 1 to assemble multiple steel box girders 3, and at the same time the assembly bracket 1 plays a role in supporting the steel box girder 3. Subsequently, install the guide beam at the front section of the first jacked steel box girder 3 so that the guide beam contacts the assembly bracket 1 on the opposite side of the river first during jacking, playing a role in stable support and preventing tipping. The jacking is realized through the jacking bracket 2. The jacking bracket 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 bracket 2 sinks and the advanced part resets. 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 the steel box girders 3 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 whole bridge. The whole process is relatively convenient and safe, greatly improving the construction efficiency.

[0051] Refer to Figures 3 to 6 , the jacking bracket 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 lifting of the support frame 21 is realized through the first jack 22, and then the lifting of the steel box girder 3 is realized. The second jack 23 is convenient for pushing the sliding seat 24 to move, and then the advancement of the steel box girder 3 is realized.

[0052] 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 slidably connected to the two guide rails 25 at the same time. The sliding seat 24 is guided by the guide rails 25 to improve the sliding stability and sliding accuracy of the sliding seat 24, and then realize accurate advancement.

[0053] The sliding seat 24 is provided with a top plate 27. A damping plate 271 is provided at the bottom of the top plate 27. A damping groove for inserting the damping plate 271 is opened on the sliding seat 24. A damping assembly 26 is provided between the damping plate 271 and the damping groove. The damping of the top plate 27 is realized through the damping assembly 26, reducing the influence of vibration on the advancement of the steel box girder 3, and further improving the advancement accuracy.

[0054] The vibration damping assembly 26 includes a damper 261 and a vibration damping spring 262. One end of the damper 261 is connected to the vibration damping plate 271, and the other end is connected to the side wall of the vibration damping groove. One end of the vibration damping spring 262 abuts against the vibration damping plate 271, and the other end abuts against the side wall of the vibration damping groove. Through the cooperation of the damper 261 and the vibration damping spring 262, buffering and energy absorption of the top plate 27 are achieved, and thus vibration damping is realized. The vibration damping spring 262 can be a compression spring or a tension spring.

[0055] The damper 261 includes a shaft rod 2611 and a sleeve rod 2612. A buffer hole for inserting the shaft rod 2611 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 vibration damping effect.

[0056] 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. A jacking rod for connecting with the support frame 21 is connected to the top of the first piston 223. 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 further connected outside the first jack 22, and the movable end of the first electric cylinder 2241 is connected to the part of the second piston 224 extending out of the second movable cavity 222.

[0057] 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 provided between the oil storage cavity 225 and the first movable cavity 221. The first one-way valve 226 allows 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. The second one-way valve 227 allows 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. The third one-way valve 228 allows 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. 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 to push the support frame 21 to be jacked up.

[0058] 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 reset itself. At this time, the sliding seat 24 is driven to reset by the reset rod 233 of the reset oil cylinder 231.

[0059] 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 opened 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 jacked up, the plug 2292 blocks the lead-out cavity 2291 to prevent the oil from flowing out so as to maintain the jacking 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 resets. 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.

[0060] 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 also just lies in 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.

[0061] 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.

[0062] In a second aspect, the present application discloses a construction method for large-deflection beam dropping of a long-span UHPC steel box composite simply supported bridge.

[0063] 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.

[0064] S2. Install temporary support brackets on the bridge deck, and the temporary support brackets are provided in several groups along the length direction of the main arch 4.

[0065] 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.

[0066] 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.

[0067] S5. Remove the temporary support bracket.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] In addition, a lifting tool 6 is connected to the hook of the crawler crane. A downward pressing assembly 62 and an upper hook assembly 61 are connected to the lifting tool 6. The downward pressing assembly 62 is used to press against the outer shell 411, and the upper hook assembly 61 is used to hook the outer shell 411. Through the cooperation of the downward pressing assembly 62 and the upper hook assembly 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 assemblies 61 and one group of downward pressing assemblies 62. The two groups of upper hook assemblies 61 are located on both sides of the downward pressing assembly 62.

[0076] Specifically, the upper hook assembly 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.

[0077] The downward pressing assembly 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 fitting the fitting plate 622 with 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.

[0078] 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, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A construction method for large-deflection beam drop of a long-span UHPC steel box composite simply-supported bridge, characterized in that, It includes the following steps: S1. Divide the main arch (4) into two side segments (42) and several intermediate segments (41), install the two side segments (42) on the bridge deck and consolidate them with the main beam; S2. Install temporary support brackets on the bridge deck, and several groups of temporary support brackets are arranged along the length direction of the main arch (4); S3. Hoist the intermediate segments (41) by a crawler crane so that several intermediate segments (41) all fall on the corresponding temporary support brackets, and connect the intermediate segments (41) with the side segments (42) and the adjacent intermediate segments (41) with each other to splice and form the main arch (4); S4. Install suspenders (7) between the main arch (4) and the bridge deck; S5. Remove the temporary support brackets.

2. The large-deflection beam-drop construction method for a long-span UHPC steel box composite simply supported bridge according to claim 1, wherein: In step S3, when hoisting the intermediate segments (41), hoist symmetrically from both sides to the middle and finally close at the mid-span.

3. The large-deflection beam-drop construction method for a long-span UHPC steel box composite simply supported bridge according to claim 2, wherein: The intermediate segment (41) includes a housing (411), reinforcing sheets (412) and reinforcing plates (413). The reinforcing sheets (412) are fixedly connected to the inner side of the housing (411) and a plurality of them are arranged along the length direction of the housing (411). The reinforcing plates (413) are fixedly connected to both the housing (411) and the reinforcing sheets (412) at the same time, and a plurality of reinforcing plates (413) are arranged along the circumferential direction of the reinforcing sheets (412).

4. A large-deflection beam-drop construction method for a long-span UHPC steel box composite simply supported bridge according to claim 3, characterized in that: The temporary support (5) includes a fixed frame (51) and an adjusting part (52) arranged on the fixed frame (51). A positioning inclined surface (521) is arranged on the adjusting part (52). The positioning inclined surface (521) is used to contact with the reinforcing sheet (412) to position the intermediate segment (41) along the length direction of the main arch (4). A positioning groove (522) is arranged on the adjusting part (52), and the positioning groove (522) is used for the reinforcing sheet (412) to be inserted into it to position the intermediate segment (41) along the width direction of the main arch (4).

5. A construction method for large-deflection beam-drop of a long-span UHPC steel box composite simply supported bridge according to claim 4, characterized in that: A sliding groove (523) is opened on the bottom surface of the positioning groove (522). A sliding piece (525) slides vertically in the sliding groove (523). The top of the sliding piece (525) extends into the positioning groove (522) to contact with the reinforcing plate (413). The bottom of the sliding piece (525) passes through the sliding groove (523) and is hinged with two connecting rods (526). One end of each of the two connecting rods (526) away from the sliding piece (525) is respectively hinged with a jacking rod (527). Both of the two jacking rods (527) slide horizontally in the adjusting part (52), and the opposite ends of the two jacking rods (527) pass through the adjusting part (52) to contact with the inner side of the housing (411).

6. A construction method for large-deflection beam dropping of a long-span UHPC steel box composite simply supported bridge according to claim 5, characterized in that: A tension spring (528) is connected between the two jacking rods (527).

7. A construction method for large-deflection beam dropping of a long-span UHPC steel box composite simply supported bridge according to claim 6, characterized in that: A limiting step (524) is arranged on the adjusting part (52), and the limiting step (524) is used to contact with the lower end surface of the housing (411).

8. A construction method for large-deflection beam-drop of a long-span UHPC steel box composite simply-supported bridge according to claim 7, characterized in that: A lifting tool (6) is connected to the hook of the crawler crane. A downward pressing assembly (62) and an upper hook assembly (61) are connected to the lifting tool (6). The downward pressing assembly (62) is used to press the housing (411), and the upper hook assembly (61) is used to hook the housing (411).

9. The construction method for large deflection beam dropping of a long-span UHPC steel box composite simply supported bridge according to claim 8, characterized in that: The upper hook assembly (61) includes two inclined hooks (611). Both of the two inclined hooks (611) are hinged to the bottom of the sling (6), and the two inclined hooks (611) are used to hook both sides of the housing (411).

10. A construction method for large deflection beam dropping of a long-span UHPC steel box composite simply supported bridge according to claim 8, characterized in that: The pressing-down assembly (62) includes a pressing-down rod (621) and a fitting plate (622). One end of the pressing-down rod (621) is fixedly connected to the sling (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 housing (411). The pressing-down rod (621) is an expansion and contraction rod. A pressing-down spring (623) is sleeved on the pressing-down rod (621). One end of the pressing-down spring (623) abuts against the sling (6), and the other end abuts against the fitting plate (622).

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