Method for installing reticular suspenders of large-span ultra-wide bridge floor steel box tied-arch bridge

Abstract

The invention relates to the field of through arch bridge construction, in particular to a method for installing a reticular suspender of a large-span super-wide bridge floor steel box tied arch bridge without temporary support under a steel box main beam in some specific environments, which comprises the following steps of: disassembling a plurality of groups of arch rib assembling brackets which are transversely arranged on the arch bridge, and installing suspender cables; the multiple groups of arch rib assembling brackets are gradually disassembled from the middle part of the arch bridge to the two end parts of the arch bridge; the dismounting work of the arch rib assembling support and the mounting work of the suspender cable are alternately carried out. According to the scheme, under the condition that no temporary support exists under the steel box girder, in the suspender installation process, the arch bridge stress and the line type of the steel box tied-arch bridge are controllable, the design expectation is met, and the stability and the safety of the arch bridge can be reliably guaranteed.

Description

Technical Field

[0001] The invention relates to the field of bottom-supported arch bridge construction, and in particular to a method for installing mesh hangers on a steel box tied arch bridge with a large span and ultra-wide deck when there is no temporary support under a steel box main beam in some specific environments. Background Art

[0002] The current construction method of the bottom-supported arch bridge includes the steps of installing the arch rib segment, pushing the beam arch as a whole, disassembling the arch rib assembly bracket, and installing the hanger. In the process of installing the arch rib segment, the arch rib assembly bracket is first installed on the beam body, and then the arch rib segment is hoisted to the top of the arch rib assembly bracket, and the arch rib assembly bracket supports and fixes the arch rib segment. After the entire arch rib is assembled, the beam body and the arch body form a beam-arch structure, and then the beam arch is pushed as a whole. After the beam arch top is pushed into place, the arch rib assembly bracket is disassembled, and finally the hanger is installed between the arch rib and the beam body. By installing the hanger, the stability of the arch bridge can be enhanced.

[0003] In the prior art, during the jacking construction, Fig. 9 As shown, it is necessary to set up multiple temporary supports for pushing under the bridge. During the pushing process, the bridge is slowly pushed forward with the support of the temporary supports. After the beam is pushed into place, the temporary supports under the bridge do not need to be removed immediately. The temporary supports can continue to provide support for the bridge that has been pushed into place. During the subsequent removal of the arch rib assembly supports on the beam body and the installation of the hanger, the arch bridge is supported by the temporary supports under the beam, which can still ensure the stability of the arch bridge force and the construction of the arch bridge is in a safe and controllable state. After the arch rib assembly supports are removed and the hanger is installed, the arch bridge can remain stable under the action of the hanger, and the temporary supports can be removed at this time.

[0004] However, due to some special conditions, after the arch bridge is pushed into place and the beams are dropped, the temporary support under the beams needs to be removed immediately. For example, if there is a high-speed rail line being built next to the temporary support, the power-on time of the high-speed rail must be strictly ensured. After the arch bridge is pushed into place and the beams are dropped to the permanent support, the temporary support under the bridge must be removed immediately to avoid the impact of the construction on the operation of the high-speed rail. After the temporary support under the beam is removed, it is impossible to dismantle the arch rib assembly support and install the hanger according to the conventional method. For this reason, an innovative installation method of the arch rib assembly support while hanging the hanger cable is proposed in the case of a bottom-supported steel box tie arch bridge without a beam support, so as to ensure that the arch bridge hanger construction is safely and reliably supported, and the stability and safety of the arch bridge are guaranteed. Summary of the invention

[0005] The present invention aims to provide a method for installing mesh hangers for a large-span and ultra-wide deck steel box tie arch bridge. By adopting a unique new hanger installation method, the stress and line shape of the arch bridge can be controlled during the hanger installation process to meet the design expectations, and the stability and safety of the arch bridge can be reliably guaranteed.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a method for installing a mesh hanger of a steel box tie arch bridge with a large span and ultra-wide bridge deck, wherein multiple groups of arch rib assembly brackets arranged laterally on the arch bridge are disassembled, and hanger cables are installed, and the disassembly direction of the multiple groups of arch rib assembly brackets is gradually disassembled from the middle part of the arch bridge to the two ends of the arch bridge; the disassembly work of the arch rib assembly brackets and the installation work of the hanger cables are carried out alternately.

[0007] The principles and advantages of the present application are as follows: the present application adopts a unique hanger installation method, and the arch rib assembly bracket is gradually disassembled from the middle part of the arch bridge to the two ends of the arch bridge; at the same time, the disassembly of the arch rib assembly bracket and the installation of the hanger cable are carried out alternately, that is, after each group of arch rib assembly brackets is disassembled, the hanger cable is first installed in the vacant part of the arch rib assembly bracket, and then the arch rib assembly brackets of other groups are disassembled, and the corresponding hanger cables are installed in the vacant part of the arch rib assembly bracket, and so on, to complete the disassembly of all groups of arch rib assembly brackets and the installation of the hanger cables.

[0008] Therefore, through the scheme of the present application, the arch rib assembly bracket is disassembled from the middle part of the arch bridge to the two ends of the arch bridge, and the suspension cable is hoisted from the middle part of the arch bridge to the two ends of the arch bridge. The installation of the suspension cable and the disassembly of the arch rib assembly bracket are carried out alternately. Compared with the prior art, there is no need to wait until all the arch rib assembly brackets on the arch bridge are disassembled before installing the suspension cable. After a group of arch rib assembly brackets are disassembled, the suspension cable can be installed. The suspension cable can replace the disassembled arch rib assembly bracket to connect and support the arch rib and the beam body. In addition, the disassembly order of the arch rib assembly bracket is from the middle part of the arch bridge to the two ends of the arch bridge, and the suspension cable is installed in the vacant part of the corresponding arch rib assembly bracket. Compared with first disassembling half of the arch rib assembly bracket, installing the suspension cable, and then disassembling the other half of the arch rib assembly bracket, and installing the suspension cable, the whole arch bridge is more evenly stressed, thereby ensuring the stability and safety of the arch bridge structure.

[0009] In summary, the adoption of the present application scheme has the following effects: 1. It can keep the beam body and arch ribs symmetrically stressed in the longitudinal and transverse directions; 2. When the system stress is converted due to the disassembly of the arch rib assembly bracket and the installation of the hanger cable, the stress and linear change trend of the beam arch changes slightly and is always in a controllable state; 3. Finite element modeling simulation of multi-stage force system conversion is more reasonable, and it is also convenient for process linear monitoring and stress monitoring; 4. The installation sequence of the hanger cable from the middle to the two ends of the arch bridge can not only ensure that the arch bridge is uniformly stressed and improve the stability and safety of the arch bridge structure, but also facilitate the layout of lifting equipment and the pushing and releasing of the arch rib assembly bracket after disassembly and assembly; 5. The adoption of the present application scheme makes the arch bridge more stable during the installation of the hanger, and the stability and safety of the arch bridge can be guaranteed, so that the top-pushing temporary bracket under the arch bridge can be removed first (or simultaneously with the installation of the hanger cable), and the top-pushing temporary bracket does not need to wait until the hanger cable is installed before being removed, which is conducive to speeding up the construction process and shortening the construction period while ensuring safety. 6. This application adopts mesh hangers to make the arch bridge evenly stressed and stable.

[0010] Preferably, as an improvement, the number of groups of arch rib assembly brackets is 2N, where N is an integer ≥ 2; from the left end to the right end of the arch bridge, each group of arch rib assembly brackets is named 1, 2, ..., 2N in sequence; First, remove the Nth group of arch rib assembly brackets and install the suspender cables; then remove the N+1th group of arch rib assembly brackets and install the suspender cables; Then the arch rib assembly brackets are dismantled in the following order: first, the N-1th group and the N+2th group of arch rib assembly brackets are dismantled simultaneously, then the N-2th group and the N+3th group of arch rib assembly brackets are dismantled simultaneously, then the N-3th group and the N+4th group of arch rib assembly brackets are dismantled simultaneously, and so on, until all the arch rib assembly brackets are dismantled.

[0011] Therefore, when the number of arch rib assembly brackets is 2N, that is, when the number of arch rib assembly brackets is an even number, the Nth group of arch rib assembly brackets is first dismantled, and the suspension cable is installed, and then the N+1th group of arch rib assembly brackets is dismantled, and the suspension cable is installed. The Nth group of arch rib assembly brackets and the N+1th group of arch rib assembly brackets cannot be dismantled at the same time, otherwise the arch rib assembly brackets in the middle part of the arch bridge will be dismantled too much, affecting the stability and safety of the arch bridge structure. After the two middle groups of arch rib assembly brackets are dismantled and the suspension cable is installed, two groups of arch rib assembly brackets (one group on each side of the left and right sides) are dismantled synchronously each time towards the two ends of the arch bridge to ensure that the arch bridge is evenly stressed and stable, and to ensure the safety of the arch bridge.

[0012] Preferably, as an improvement, the number of groups of arch rib assembly brackets is 2M+1, where M is an integer ≥ 2; from the left end to the right end of the arch bridge, each group of arch rib assembly brackets is named 1, 2, ..., 2M+1 in sequence; First, remove the M+1 group of arch rib assembly brackets and install the suspender cables; Then the arch rib assembly brackets are dismantled in the following order: first, the Mth group and the M+2th group of arch rib assembly brackets are dismantled simultaneously, then the M-1th group and the M+3th group of arch rib assembly brackets are dismantled simultaneously, then the M-2th group and the M+4th group of arch rib assembly brackets are dismantled simultaneously, and so on, until all the arch rib assembly brackets are dismantled.

[0013] Therefore, when the number of arch rib assembly brackets is 2M+1, that is, when the number of arch rib assembly brackets is an odd number, the M+1 arch rib assembly brackets (the arch rib assembly brackets in the middle of the arch bridge) are first removed, and the suspension cables are installed. After the M+1 arch rib assembly brackets are disassembled and installed, two groups of arch rib assembly brackets (one group on each side) are removed synchronously at each end of the arch bridge to ensure that the arch bridge is evenly stressed and stable, and to ensure the safety of the arch bridge.

[0014] Preferably, as an improvement, the end of the arch bridge on the side with a smaller mileage is the left end, and the end of the arch bridge on the side with a larger mileage is the right end.

[0015] Preferably, as an improvement, N is 5-8.

[0016] Preferably, as an improvement, M is 5-8.

[0017] Preferably, as an improvement, after every two groups of arch rib assembly brackets are synchronously removed, the suspension rods are synchronously installed in the vacant parts of the two groups of arch rib assembly brackets. Thus, after the two groups of arch rib assembly brackets on the arch bridge are synchronously removed, the suspension rods are synchronously installed in the vacant parts of the two groups of arch rib assembly brackets, thereby ensuring that the arch bridge is evenly and stably stressed, which is conducive to ensuring the stability and safety of the arch bridge.

[0018] Preferably, as an improvement, the hanger cables on the arch bridge include a plurality of hanger cables inclined to the right and a plurality of hanger cables inclined to the left, and the hanger cables inclined to the right and the hanger cables inclined to the left are crossed to form a mesh.

[0019] Preferably, as an improvement, a plurality of right-inclined boom cables are arranged in parallel.

[0020] Preferably, as an improvement, a plurality of left-inclined boom cables are arranged in parallel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the arch bridge after it has been jacked into place (including all the arch rib assembly brackets, and the temporary jacking brackets under the beams have been removed).

[0022] Figure 2 This is a structural diagram of the arch bridge (the B6-A8 / A9 / A10 arch rib assembly bracket on the short-mileage side is removed).

[0023] Figure 3 This is a structural diagram of the arch bridge (the B6-A8 / A9 / A10 arch rib assembly bracket on the long mileage side is removed).

[0024] Figure 4 This is a structural diagram of the arch bridge (the B5-A6 / A7 / A8 arch rib assembly brackets on the large and small mileage sides are removed simultaneously).

[0025] Figure 5 This is a structural diagram of the arch bridge (the B4-A4 / A5 / A6 arch rib assembly brackets on the large and small mileage sides are removed simultaneously).

[0026] Figure 6 This is a structural diagram of the arch bridge (the B3-A3 / A4 arch rib assembly brackets on the large and small mileage sides are removed simultaneously).

[0027] Figure 7 This is a structural diagram of the arch bridge (the B2-A2 / A3 arch rib assembly brackets on the large and small mileage sides are removed simultaneously).

[0028] Figure 8 This is a structural diagram of the arch bridge (the B1-A1 / A2 arch rib assembly brackets on the large and small mileage sides are removed simultaneously).

[0029] Fig. 9 It is a schematic diagram of the support of the arch bridge by the temporary pier (temporary support for pushing) after the arch bridge is pushed into place according to the prior art. DETAILED DESCRIPTION

[0030] The following is further described in detail through specific implementation methods: The reference numerals in the drawings of the specification include: arch rib 1, beam body 2, arch rib assembly bracket 3.

[0031] Example 1 Basically as attached Figure 1-Figure 8 shown.

[0032] This embodiment discloses a method for installing mesh hangers on a steel box tied arch bridge with a large span and ultra-wide deck. Figure 1 The arch rib assembly bracket 3 on the middle arch bridge (the arch bridge includes the arch rib 1 and the beam body 2) is dismantled, and the suspension cable is installed. The main improvement of this method is that the dismantling direction of multiple groups of arch rib assembly brackets 3 is gradually dismantled from the middle part of the arch bridge to the two ends of the arch bridge; at the same time, the dismantling work of the arch rib assembly bracket 3 and the installation of the suspension cable are carried out alternately, that is, each time a group of arch rib assembly brackets 3 is dismantled, the suspension cable is installed in the vacant part of the arch rib assembly bracket 3 on the arch bridge, and then another group of arch rib assembly brackets 3 is dismantled, and the suspension cable is installed in the vacant part of other arch rib assembly brackets 3 on the arch bridge, and so on, to complete the dismantling of the arch rib assembly bracket 3 and the installation of the suspension cable.

[0033] Specifically in this embodiment, the number of groups of the arch rib assembly brackets 3 in this embodiment is 2N, N is an integer ≥ 2, in this embodiment N is 5-8, specifically 6, so in this embodiment, there are a total of 12 arch rib assembly brackets 3; from the left end to the right end of the arch bridge, each group of arch rib assembly brackets 3 is named 1, 2, 3, 4, ..., 12. The left end of the arch bridge in this embodiment is the end of the arch bridge on the side with a small mileage, and the right end of the arch bridge is the end of the arch bridge on the side with a large mileage. Figure 1 Each group of arch rib assembly brackets 3 includes a plurality of support rods, and the tops of the plurality of support rods in each group are close to each other and the bottoms are separated from each other. Figure 1 The arch ribs on the small and medium mileage side are marked with B1-B6 from left to right, and the arch ribs on the large mileage side are marked with B6-B1 from left to right. Each marked position corresponds to the position where the top of each group of arch rib assembly brackets 3 is connected to the arch rib; in addition, Figure 1 The bottom of the beam body 2 on the small and medium mileage side is marked A1-A10 from left to right, and the bottom of the beam body 2 on the large mileage side is marked A10-A1 from left to right. These two A10s are the same, and each marked part corresponds to the connection part between the support rod and the beam body 2.

[0034] The following describes the steps for installing the boom in detail.

[0035] First, combine Figure 2 As shown, first remove the sixth group of arch rib assembly brackets 3 (corresponding to the arch rib assembly brackets 3 at B6-A8 / A9 / A10 on the side of the small mileage in the figure), and install the suspension cables (LS11 and RS10 suspension cables in the figure, LS11 and RS10 suspension cables are cross-arranged); combine Figure 3 As shown, remove the seventh group of arch rib assembly brackets 3 (corresponding to the arch rib assembly brackets 3 at B6-A8 / A9 / A10 on the large mileage side in the figure), and install the suspension cables (LS12, LS13, LS14, RS11, RS12, RS13 suspension cables in the figure, which are cross-arranged); Then dismantle the arch rib assembly bracket 3 in the following order: 1. Figure 4 As shown, the 5th and 7th groups of arch rib assembly brackets 3 are removed simultaneously (the arch rib assembly brackets 3 at B5-A6 / A7 / A8 on the large and small mileage sides are removed simultaneously), and the LS9, LS10, LS15, LS16, RS8, RS9, RS14, and RS15 suspension cables are installed at the same time; 2. Combined Figure 5 As shown, the 4th and 8th groups of arch rib assembly brackets 3 are removed simultaneously (the arch rib assembly brackets 3 at B4-A4 / A5 / A6 on the large and small mileage sides are removed simultaneously), and the LS6-8, LS17-19, RS5-7, and RS16-18 suspension cables are installed at the same time; 3. Combined Figure 6 As shown, the 3rd and 10th groups of arch rib assembly brackets 3 are removed simultaneously (the arch rib assembly brackets 3 at B3-A3 / A4 on the large and small mileage sides are removed simultaneously), and the LS4-5, LS20, RS4, and RS19-20 suspension cables are installed at the same time; 4. Combined Figure 7 As shown, the 2nd and 11th groups of arch rib assembly brackets 3 are removed simultaneously (the arch rib assembly brackets 3 at B2-A2 / A3 on the large and small mileage sides are removed simultaneously), and RS3 and LS21 suspension cables are installed at the same time; 5. Figure 8 As shown, the arch rib assembly brackets 3 of the 1st and 12th groups are also removed simultaneously (the arch rib assembly brackets 3 at B1-A1 / A2 on the large and small mileage sides are removed simultaneously), and LS1-3, LS22-23, RS1-2, and RS21-23 are installed at the same time, thereby completing the removal of all arch rib assembly brackets 3.

[0036] The suspender cables on the arch bridge in this embodiment include a plurality of suspender cables inclined to the right and a plurality of suspender cables inclined to the left, the suspender cables inclined to the right and the suspender cables inclined to the left are crossed to form a mesh. The plurality of suspender cables inclined to the right are arranged in parallel. The plurality of suspender cables inclined to the left are arranged in parallel.

[0037] Example 2 The number of the arch rib assembly brackets 3 in Example 1 is an even number, and the number of groups of the arch rib assembly brackets 3 in this embodiment is 2M+1, that is, an odd number, where M is an integer ≥ 2, M is 5-8, and specifically M is 6; from the left end to the right end of the arch bridge, each group of arch rib assembly brackets 3 is named 1, 2, 3, ..., 13 in sequence; Similar to Example 1, when removing the arch rib assembly bracket 3 and installing the suspension rod cable, first remove the seventh group of arch rib assembly brackets 3 and install the suspension rod cable; Then, the arch rib assembly bracket 3 is dismantled in sequence in the following order: 1. The 6th and 8th groups of arch rib assembly brackets 3 are dismantled synchronously, and the hanger cables are installed synchronously after dismantling; 2. The 5th and 9th groups of arch rib assembly brackets 3 are dismantled synchronously, and the hanger cables are installed synchronously after dismantling; 3. The 4th and 10th groups of arch rib assembly brackets 3 are dismantled synchronously, and the hanger cables are installed synchronously after dismantling; 4. The 3rd and 11th groups of arch rib assembly brackets 3 are dismantled synchronously, and the hanger cables are installed synchronously after dismantling; 5. The 2nd and 12th groups of arch rib assembly brackets 3 are dismantled synchronously, and the hanger cables are installed synchronously after dismantling; 6. The 1st and 13th groups of arch rib assembly brackets 3 are dismantled synchronously, and the hanger cables are installed synchronously after dismantling.

[0038] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for installing a mesh hanger on a steel box tied arch bridge with a large span and ultra-wide deck, wherein multiple groups of arch rib assembly brackets arranged laterally on the arch bridge are disassembled and hanger cables are installed, and the method is characterized in that: The disassembly direction of the multiple groups of arch rib assembly brackets is gradually from the middle part of the arch bridge to the two ends of the arch bridge; the disassembly work of the arch rib assembly brackets and the installation work of the hanger cables are carried out alternately.

2. The method for installing mesh hangers of a large-span and ultra-wide deck steel box tied arch bridge according to claim 1 is characterized in that: The number of groups of the arch rib assembly brackets is 2N, where N is an integer ≥ 2; from the left end to the right end of the arch bridge, each group of arch rib assembly brackets is named 1, 2, ..., 2N in sequence; first remove the Nth group of arch rib assembly brackets, and install the hanger cables; then remove the N+1th group of arch rib assembly brackets, and install the hanger cables; then remove the arch rib assembly brackets in the following order: first remove the N-1th group and the N+2th group of arch rib assembly brackets simultaneously, then remove the N-2th group and the N+3th group of arch rib assembly brackets simultaneously, then remove the N-3th group and the N+4th group of arch rib assembly brackets simultaneously, ..., and so on, to complete the removal of all arch rib assembly brackets.

3. The method for installing mesh hangers of a large-span and ultra-wide deck steel box tied arch bridge according to claim 1 is characterized in that: The number of groups of the arch rib assembly brackets is 2M+1, where M is an integer ≥2; from the left end to the right end of the arch bridge, each group of arch rib assembly brackets is named 1, 2, ..., 2M+1 in sequence; first remove the M+1th group of arch rib assembly brackets, and install the hanger cables; then remove the arch rib assembly brackets in the following order: first remove the Mth and M+2th groups of arch rib assembly brackets simultaneously, then remove the M-1th and M+3th groups of arch rib assembly brackets simultaneously, then remove the M-2th and M+4th groups of arch rib assembly brackets simultaneously, ..., and so on, until all arch rib assembly brackets are removed.

4. The method for installing mesh hangers of a steel box tied arch bridge with a large span and ultra-wide deck according to claim 2 or 3 is characterized in that: The end of the arch bridge on the side with a smaller mileage is the left end, and the end of the arch bridge on the side with a larger mileage is the right end.

5. The method for installing mesh hangers of a large-span and ultra-wide deck steel box tied arch bridge according to claim 2 is characterized in that: N is 5-8.

6. The method for installing mesh hangers of a steel box tied arch bridge with a large span and ultra-wide deck according to claim 3 is characterized in that: M is 5-8.

7. The method for installing mesh hangers of a steel box tied arch bridge with a large span and ultra-wide deck according to claim 2 or 3 is characterized in that: After every two sets of arch rib assembly brackets are dismantled simultaneously, the hanger cables are installed simultaneously in the vacant positions of the two sets of arch rib assembly brackets.

8. The method for installing mesh hangers of a large-span and ultra-wide deck steel box tied arch bridge according to claim 1 is characterized in that: The suspender cables on the arch bridge include a plurality of suspender cables inclined to the right and a plurality of suspender cables inclined to the left, and the suspender cables inclined to the right and the suspender cables inclined to the left are crossed to form a network.

9. The method for installing mesh hangers of a steel box tied arch bridge with a large span and ultra-wide deck according to claim 8 is characterized in that: A plurality of right-inclined boom cables are arranged in parallel.

10. The method for installing mesh hangers of a steel box tied arch bridge with a large span and ultra-wide deck according to claim 8 is characterized in that: A plurality of left-inclined boom cables are arranged in parallel.

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