Temporary combined supporting structure for arch of super-wide steel box tied arch bridge

Abstract

The utility model relates to the field of arch bridge construction, in particular to an ultra-wide steel box tied arch bridge arch temporary combination supporting structure which comprises an arch rib, a beam body and a plurality of transversely-arranged supporting units. The supporting unit is located between the arch rib and the beam body and comprises a plurality of supporting assemblies, each supporting assembly comprises two supporting rods, the tops of the two supporting rods are fixedly connected with clamping supporting parts, the arch rib is located at the tops of the supporting rods, and the two clamping supporting parts are located on the left side and the right side of the arch rib respectively. The left side face and the right side face of the arch rib are fixedly connected with the two clamping supporting parts respectively. According to the scheme, the arch rib is supported by the two rows of supporting rods, the supporting stability of the temporary combined supporting structure is improved, and it is guaranteed that the arch rib has enough rigidity and stability.

Description

Technical Field

[0001] This utility model relates to the field of arch bridge construction, specifically to a temporary combined support structure for ultra-wide steel box girder arch bridges. Background Technology

[0002] An arch bridge consists of a beam and an arch. The arch is located on the beam and includes arch ribs, which are assembled and fixed from multiple arch rib segments.

[0003] The current construction method for through-arch bridges includes the steps of arch rib segment installation, overall beam-arch jacking, and arch rib assembly bracket dismantling. During arch rib segment installation, the arch rib assembly bracket is first installed on the beam. Then, the arch rib segments are hoisted onto the top of the arch rib assembly bracket, which supports the segments. Adjacent arch rib segments are then assembled, and the bracket fixing structure secures the segments and the assembly bracket. After the entire arch rib is assembled, the beam and arch form a beam-arch structure. The beam-arch is then jacked into place, and the arch rib assembly bracket is dismantled. Following dismantling, the hangers are installed.

[0004] In summary, during the overall jacking process of the lower-bearing arch beam, temporary support structures such as arch rib assembly brackets are required to support the arch ribs.

[0005] Chinese utility model patent CN217733787U discloses a temporary support structure between the arch beams during the jacking of a flexible tied arch bridge. This patent uses a temporary support structure to support the arch ribs. However, the support rods under each arch rib in this patent are only in one row. This single-row support structure results in low stability and capacity. Furthermore, the connection between the arch ribs and the support rods is via lugs and hinges, leading to weak connection strength. When dealing with large-span arch structures or wide arch bridges, the aforementioned support structure cannot guarantee sufficient stiffness and stability for supporting the arch ribs. It also cannot guarantee sufficient strength, stiffness, and stability for the main steel box girder and arch ribs during the overall jacking and lowering of the tied arch bridge.

[0006] In addition, combined Figure 7 As shown, in existing technologies, after an arch bridge is jacked into place and the beams are lowered, the bridge is still supported by temporary piers used for jacking. During subsequent disassembly of the arch rib assembly support and installation of the hangers, the bridge remains supported by these temporary piers, thus the strength requirements for the arch rib assembly support are not high. However, due to factors such as terrain and construction timelines (e.g., the presence of a railway line next to the temporary piers, limiting railway power supply), the temporary piers under the bridge need to be removed before disassembling the arch rib assembly support and installing the hangers after jacking is completed. Figure 8As shown, after the bridge is dismantled, the temporary piers are no longer in place to support it. At this point, the greater forces of the beams and arch ribs are transferred to the arch rib assembly support. The existing arch rib assembly support is obviously unable to provide sufficient support for the arch bridge and cannot guarantee that the steel box girder and arch rib have sufficient strength, stiffness and stability. Utility Model Content

[0007] This utility model aims to provide a temporary combined support structure for the under-deck ultra-wide steel box girder tied arch bridge to improve the support stability during the construction process. In addition to ensuring that the main steel box girder and arch rib have sufficient strength, stiffness and stability during the overall jacking and lowering of the under-deck steel box girder tied arch bridge, it also ensures that after the jacking and lowering of the girder, during the process of removing the temporary jacking piers under the girder and installing the hangers, the remaining support units can provide effective and stable support during the gradual dismantling of the support units, thereby ensuring that the main steel box girder and arch rib have sufficient strength, stiffness and stability.

[0008] To achieve the above objectives, this utility model adopts the following technical solution: a temporary combined support structure for an ultra-wide steel box girder arch bridge, comprising an arch rib, a beam, and multiple support units arranged laterally; the support unit is located between the arch rib and the beam, and the support unit includes multiple support components, each support component including two support rods, the top of which is fixedly connected to a clamping support part, the arch rib being located at the top of the support rods, the two clamping support parts being located on the left and right sides of the arch rib respectively, and the left and right sides of the arch rib being fixedly connected to the two clamping support parts respectively.

[0009] The principle and advantages of this application are as follows: The temporary combined support structure in this application includes multiple support units, each support unit includes multiple support components, and each support component includes two support rods. The two support rods are located below the arch rib, and the arch rib is located on top of the two support rods. The two support rods support the arch rib simultaneously. In this way, the multiple support units will form two rows of support rods that support the arch rib simultaneously. Compared with the single row of support rods supporting the arch rib in the prior art, this improves the support stability of the temporary combined support structure and ensures sufficient rigidity and stability when supporting the arch rib.

[0010] In addition, each support rod in this application is provided with a clamping support at its top. The arch rib is located between two clamping supports on two support rods. The two clamping supports are fixed to the left and right sides of the arch rib respectively. The two clamping supports support and limit the arch rib. In this way, the bottom of the arch rib is supported by the top of the support rod, and the left and right sides of the arch rib are clamped by the two clamping supports. Compared with the prior art, which is only connected by lifting lugs and hinges, the three sides of the arch rib are fixed and limited. The stability of the arch rib and the stress safety of the main beam of the steel box tie rod during the jacking process and the removal of the support unit on the beam and the installation of the hangers are greatly improved. It can ensure that the main beam of the steel box tie rod and the arch rib have sufficient strength, stiffness and stability when the arch bridge arch is jacked as a whole and the force system of the main beam of the steel box tie rod and the arch rib are converted during the subsequent installation of the hangers.

[0011] In summary, the proposed scheme for a tied-arch steel box girder bridge, under constraints such as crossing railways, employs a method where the arch beam is assembled at the tail of the abutment and then jacked into place as a whole, followed by lowering the beam. Then, with the temporary piers under the tied steel beam removed, the support units are dismantled while the hangers are installed. The remaining support units provide effective and sufficient strength support, ensuring that the stress and alignment of the tied-arch steel box girder are controllable and meet design requirements. Simultaneously, it guarantees the stiffness and stability of the arch ribs and temporary combined support structures under various construction conditions. This is particularly significant for large-span tied-arch steel box girder structures and wide arch bridges, improving the stability and safety of beam-arch construction.

[0012] Preferably, as an improvement, multiple transverse connecting rods connect the two support rods, with these connecting rods distributed along the length of the support rods. Thus, the multiple transverse connecting rods connect the two support rods together, making the structure of the support assembly more stable and robust.

[0013] Preferably, as an improvement, the support unit includes 2-3 support components.

[0014] Preferably, as an improvement, the distance between the tops of the multiple support components in the support unit is smaller than the distance between the bottoms of the multiple support components.

[0015] Preferably, as an improvement, a portion of the support units includes two support components, and the remaining portion of the support units includes three support components; the support units with three support components are arranged in the center.

[0016] Therefore, this solution adopts a support unit with a special structure. According to the arched shape characteristics of the arch rib, the height in the middle part of the arch rib is relatively large, while the height at both ends of the arch rib is relatively small. Therefore, due to the relatively large height of the arch rib compared to the middle part, using a support unit with 3 support components for support is more conducive to improving stability than using a support unit with 2 support components for support; for the part of the arch rib close to the end, due to the relatively low height, a support unit with 2 support components can be selected for support. Because the height of the arch rib end is relatively low, compared with the middle part of the arch rib, a large support force is not required, so there is no need to use a support unit with 3 support components for support. At the same time, the support unit with 2 support components saves more space compared to the support unit with 3 support components.

[0017] In addition, in the solution of this application, the shape of the support unit including 3 support components is similar to the Chinese character "个". The 3 support components jointly support the arch rib, which can make the arch rib structure more stable and stronger, and can be applied to the arch rib on a long-span and ultra-wide bridge deck to provide stable support for it.

[0018] Preferably, as an improvement, the number of support units with 3 support components is 6 - 10.

[0019] Preferably, as an improvement, the number of support units with 2 support components is 2 - 8.

[0020] Preferably, as an improvement, the cross-sectional shape of the arch rib is trapezoidal. The trapezoidal arch rib is suitable for the temporary support structure in this application.

[0021] Preferably, as an improvement, a stiffening plate is fixedly connected between the bottom of the support rod and the beam body. The setting of the stiffening plate avoids the stress concentration at the connection between the bottom of the support rod and the beam body, and at the same time increases the strength, stiffness and stability of the connection, ensuring that the force at the connection of the bottom of the support rod is more reasonable.

[0022] Preferably, as an improvement, a slot is provided on the beam body, and the stiffening plate is inserted into the slot. Thus, the stiffening plate is inserted into the slot, and the connection between the stiffening plate and the beam body is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a beam arch.

[0024] Figure 2 It shows the structure of the connection of an arch rib segment, a beam body and a support unit on the beam arch.

[0025] Figure 3 It is Figure 2 The structural schematic diagram of B - B of, showing the structure of a support component supporting the arch rib.

[0026] Figure 4 This is a schematic diagram showing the connection between the bottom of the support rod and the beam.

[0027] Figure 5 for Figure 4 A diagram showing the view from the right.

[0028] Figure 6 for Figure 1 A left-side view diagram.

[0029] Figure 7 This is a schematic diagram showing the temporary pier supporting the arch after the beam is pushed into place in the existing technology.

[0030] Figure 8 This is a schematic diagram showing the temporary piers being removed before the arch rib assembly support is dismantled after the arch crown has been pushed into place. Detailed Implementation

[0031] The following detailed description illustrates the specific implementation method:

[0032] The reference numerals in the accompanying drawings include: arch rib 1, beam 2, support rod 3, clamping support 7, stiffening plate 8, and connecting rod 9.

[0033] The basic implementation examples are as follows: Figures 1-6 As shown.

[0034] This embodiment discloses a temporary combined support structure for ultra-wide steel box girder arch bridges applied to beam-arch structures. Combined with... Figure 1 and Figure 6 As shown, the beam arch in this embodiment includes arch ribs 1 and beam body 2. The arch ribs 1 are located above the beam body 2, and there are two arch ribs 1. This embodiment describes one side of the arch ribs 1 as an example, while the arch ribs 1 on the other side and the corresponding temporary combined support structures can be arranged symmetrically.

[0035] The temporary combined support structure for an ultra-wide steel box girder tied arch bridge arch includes arch rib 1, beam 2, and multiple transversely arranged support units. Figure 1 As shown, the support unit is located between the arch rib 1 and the beam 2. In this embodiment, there are 12 support units, which are arranged sequentially from left to right. The height of the support unit gradually increases and then gradually decreases from left to right.

[0036] The support unit in this embodiment includes multiple support components. Specifically, the middle 6 support units of the 12 support units each include 3 support components, while the other 6 support units each include 2 support components. Therefore... Figure 1From left to right, the support units consist of three units with two support components, six units with three support components, and three units with two support components. In this embodiment, the distance between the tops of the support components in each support unit is less than the distance between the bottoms of the support components.

[0037] Combination Figure 2 and Figure 3 As shown, each support component in this embodiment includes two support rods 3. The tops of both support rods 3 are fixedly connected (e.g., welded) to clamping support parts 7. Specifically, the clamping support parts 7 in this embodiment are welded from steel plates (they can be one or more steel plates welded together). An arch rib 1 is located at the top of the support rods 3, with the top of the support rods 3 abutting against the bottom of the arch rib 1. The top of the support rods 3 supports the bottom of the arch rib 1. Simultaneously, the two clamping support parts 7 are located on the left and right sides of the arch rib 1, respectively, and the left and right sides of the arch rib 1 are fixedly connected (e.g., welded) to the two clamping support parts 7. In this embodiment, the cross-sectional shape of the arch rib 1 is trapezoidal, with the top width of the arch rib 1 being greater than the bottom width.

[0038] To improve the strength of the support components, in this embodiment, multiple transverse connecting rods 9 are connected between the two support rods 3 (e.g., by welding or by bolts). The multiple connecting rods 9 are all arranged transversely and are distributed along the length of the support rods 3.

[0039] The number of support units and the number of support components in each support unit can be set according to the actual situation in different implementations. The cross-sectional shape of the arch rib 1 is trapezoidal.

[0040] In addition, combined Figure 4 and Figure 5 As shown, in this embodiment, a stiffening plate 8 is fixedly connected (e.g., welded) between the bottom of the support rod 3 and the beam 2. To improve the stability of the connection, a slot is provided on the beam 2 in this embodiment, the stiffening plate 8 is inserted into the slot, the stiffening plate 8 is welded to the beam 2, and the stiffening plate 8 is welded to the bottom of the support rod 3.

[0041] In this embodiment, the temporary combined support structure includes multiple support units, each support unit includes multiple support components, and each support component includes two support rods 3. The two support rods 3 are located below the arch rib 1, and the arch rib 1 is located on top of the two support rods 3. The two support rods 3 support the same arch rib 1 simultaneously. In this way, the multiple support units will form two rows of support rods 3 supporting the same arch rib 1 simultaneously (the other arch rib 1 adopts the same structure for support). Compared with the prior art where a single row of support rods 3 supports the same arch rib 1, the support stability of the temporary combined support structure is improved, and sufficient rigidity and stability are ensured when supporting the arch rib 1.

[0042] In addition, each support rod 3 in this application is provided with a clamping support part 7 at its top. The arch rib 1 is located between the two clamping support parts 7 on the two support rods 3. The two clamping support parts 7 are fixed to the left and right sides of the arch rib 1 respectively. The two clamping support parts 7 support the arch rib 1. In this way, the bottom of the arch rib 1 is supported by the top of the support rod 3, and the left and right sides of the arch rib 1 are clamped by the two clamping support parts 7. Compared with the prior art, which is only connected by the lug and the hinge, the three sides of the arch rib 1 are fixed and limited, which greatly improves the stability of the arch rib 1 and can ensure that the arch rib 1 has sufficient rigidity and stability when supported.

[0043] In addition, the bottom of the support rod 3 is reinforced with stiffening plate 8, which improves the stability of its connection with the beam 2 and enhances the strength, stiffness and stability of the connection.

[0044] The temporary combined support structure used in this embodiment improves the support stability during construction, ensuring sufficient strength, stiffness, and stability for the main steel box girder and arch ribs during the overall jacking and lowering of the lower-bearing steel box tied arch bridge. It also has the following significance: [Further details about the combined structure are needed for a complete translation.] Figure 8 As shown, in this embodiment, after the beam arch and temporary combined support structure are pushed into place as a whole and the beam is lowered, all the temporary jacking piers under the bridge are removed. The temporary combined support structure can also provide stable support, ensuring that the steel box girder and arch rib have sufficient strength, stiffness and stability. At the same time, the subsequent installation of the hangers is carried out. During the installation of the hangers, hangers are installed at the corresponding locations after each support unit is removed, until all support units are removed and the hangers are installed. In this entire process, the temporary support structure in this embodiment is used. As the support units are gradually removed, the support units that are not removed can provide effective and stable support, thereby ensuring that the steel box girder and arch rib have sufficient strength, stiffness and stability.

[0045] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A temporary combined support structure for an ultra-wide steel box girder arch bridge, comprising an arch rib, a beam, and multiple transversely arranged support units; the support units are located between the arch rib and the beam, and each support unit includes multiple support components, characterized in that: Each support assembly includes two support rods, and a clamping support part is fixedly connected to the top of each support rod. The arch rib is located at the top of the support rod, and the two clamping support parts are located on the left and right sides of the arch rib, respectively. The left and right sides of the arch rib are fixedly connected to the two clamping support parts.

2. The temporary combined support structure for ultra-wide steel box girder arch bridges according to claim 1, characterized in that: Multiple transverse connecting rods connect the two support rods, and these connecting rods are distributed along the length of the support rods.

3. The temporary combined support structure for ultra-wide steel box girder arch bridges according to claim 1, characterized in that: The support unit includes 2-3 support components.

4. The temporary combined support structure for ultra-wide steel box girder arch bridges according to claim 3, characterized in that: The distance between the tops of the multiple support components in the support unit is less than the distance between the bottoms of the multiple support components.

5. The temporary combined support structure for ultra-wide steel box girder arch bridges according to claim 3, characterized in that: One part of the support unit includes 2 support components, and the remaining part of the support unit includes 3 support components; the support unit with 3 support components is arranged in the center.

6. The temporary combined support structure for ultra-wide steel box girder arch bridges according to claim 5, characterized in that: The number of support units with 3 support components is 6-10.

7. The temporary combined support structure for ultra-wide steel box girder arch bridges according to claim 6, characterized in that: The number of support units with two support components is 2-8.

8. The temporary combined support structure for ultra-wide steel box girder arch bridges according to claim 1, characterized in that: The cross-sectional shape of the arch rib is trapezoidal.

9. The temporary combined support structure for ultra-wide steel box girder arch bridges according to claim 1, characterized in that: A stiffening plate is fixed between the bottom of the support rod and the beam.

10. The temporary combined support structure for ultra-wide steel box girder arch bridges according to claim 9, characterized in that: The beam has a slot, and the stiffening plate is inserted into the slot.

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