Construction method of through basket handle tied arch bridge and hoisting method of steel beam segment

Abstract

This invention relates to the field of arch bridge construction technology, and discloses a construction method for a tied-arch bridge with a lower deck and a method for hoisting steel beam segments. Using hoisting equipment, steel beam segments are lifted from the outside of the arch rib parallel to the bridge to the area below the horizontal tie rods of the arch rib. Subsequently, temporary fixing points are set on the arch rib, and the fixing points on the arch rib are transferred from the hoisting equipment to the temporary fixing points, so that the cable hoist of the hoisting equipment can move from the area between the two arch ribs to the area outside the two arch ribs. Finally, the construction of all steel beam segments is completed using this method. Compared with traditional cable hoisting equipment, when constructing a tied-arch bridge with a lower deck, the main beam can be hoisted on the arch rib hoisting platform, eliminating the need for a separate steel beam hoisting platform. This reduces the construction of temporary facilities during construction, saves time, reduces costs, and effectively avoids resource waste.

Description

Technical Field

[0001] This invention relates to the field of arch bridge construction technology, specifically to a construction method for a bottom-bearing tied-arch bridge and a method for hoisting steel beam segments. Background Technology

[0002] Compared to parallel arch bridges, the arch ribs of basket-lift tied arch bridges typically incline inward at a certain angle. When constructing this type of arch bridge using the "arch first, beam later" construction method, cable cranes are often required. In situations involving deep mountain valleys or where water transport is impossible, the hoisting of the arch ribs and main beams can only be carried out using a dedicated hoisting platform. However, due to the unique structural design of basket-lift tied arch bridges, after the arch ribs are constructed, the steel beams, once lifted from the hoisting platform, cannot pass through the inwardly inclining arch ribs and the temporary horizontal tie rods set up on the bridge deck to reach their installation position. A separate steel beam hoisting platform must be constructed below the bridge deck. Due to site limitations, this usually requires an underwater working platform, increasing construction difficulty and costs, and inevitably causing some environmental pollution, especially in areas with strict water environment protection requirements, where this is simply not feasible.

[0003] Existing technologies include setting up underwater work platforms on the shore. This method is technologically mature, but it requires constructing pile foundations in the water, which is difficult, time-consuming, costly, and polluting when encountering pebbles or rock formations. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, a construction method for a bottom-bearing tied-arch bridge and a method for hoisting steel beam segments are provided. This reduces the construction of temporary facilities during the construction process, saves time, reduces costs, and effectively avoids resource waste.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] A cable-stayed hoisting method for steel beam segments in a tied-arch bridge with under-bearing structure is characterized by the following steps: after the arch ribs are closed, the steel beam segments are hoisted to the area below the horizontal tie rods of the arch ribs in a state parallel to the bridge, and the steel beams are rotated horizontally by 90°; temporary hoisting points are set below the arch ribs, and the steel beam segments are fixed to the temporary hoisting points; the cable hoist of the hoisting equipment is moved from the area between the arch ribs to the area outside the arch ribs, and the steel beam segments are switched back to the state of being suspended on the cable hoist; then the installation of the steel beam segments is completed.

[0007] According to the above technical solution, the specific steps are as follows:

[0008] S1: The assembled steel beam segments are lifted from the lifting platform to the turning area below the arch rib;

[0009] S2: The steel beam segment is horizontally rotated 90° in the turning area using hoisting equipment;

[0010] S3: Temporarily fix the steel beam segments by pre-arranging temporary lifting points under the arch ribs in the turning area;

[0011] S4: Release the cable crane hooks and move the upstream and downstream cable cranes to the outside of the arch rib respectively;

[0012] S5: The cable hoist will lift the steel beam to the mid-span through the lifting points on the steel beams located on the outside of the arch rib;

[0013] S6: After fine-tuning and positioning, connect the steel beam segment to the hanger.

[0014] According to the above technical solution, the hoisting equipment includes a cable crane and a steering device. Both the cable crane and the steering device are existing mature structures, and the appropriate specifications of the equipment are adopted according to the construction requirements. The cable crane equipment includes cable towers located on both sides of the bridge, two sets of main cables connected between the cable towers, and cable saddles located between the cable towers and the main cables. The spacing between the two sets of main cables is adjusted by the cable saddles, and a suspension cable is installed on the main cables. The bottom of the suspension cable is connected to the steel beam segment through the steering device.

[0015] According to the above technical solution, a lifting area is selected at both ends of the area between the two arch ribs, and the length of the lifting area is greater than the length of the steel beam segment; it is necessary to ensure that the steel beam segment moves vertically from top to bottom without obstruction or interference; the part of the lifting area below the temporary horizontal tie rod between the arch ribs is used as the turning area.

[0016] According to the above technical solution, a lifting area is selected at both ends of the region between the two arch ribs, and there is an obstruction at the upper end of this region near the middle of the bridge; the length of the lifting area is greater than the length of the steel beam segment, and the length of the region near the end of the bridge is greater than the length between the nearest lifting point to one end of the steel beam segment and the other end; the steel beam segment moves vertically from top to bottom without obstruction or interference below the obstruction; the part of this region below the temporary horizontal tie rod between the arch ribs is designated as the turning area.

[0017] According to the above technical solution, the lifting platform is set on the ground at the end of the bridge where the lifting area is located.

[0018] According to the above technical solution, two sets of lifting points are provided on the steel beam segment. The distance between the lifting points in one set is less than the width between the two arch ribs, and the distance between the lifting points in the other set is greater than the width between the two arch ribs.

[0019] A construction method for a bottom-bearing tied-arch bridge, characterized by the following steps:

[0020] S1: Prepare for construction;

[0021] S2: Hoist the arch ribs and close the closure, install temporary horizontal tie rods and tension them;

[0022] S3: Based on any of the above-described cable hoisting methods for steel beam segments in a bottom-bearing tied arch bridge, the steel beam segments are hoisted and joined together.

[0023] S4: Install permanent tie rods and remove temporary horizontal tie rods;

[0024] S5: Construction of bridge deck paving, completion of arch bridge construction.

[0025] The present invention has the following beneficial effects:

[0026] Because various connecting components (such as temporary horizontal tie rods and various transverse connecting structures) exist between the arch ribs after closure, steel beam segments cannot be moved to their installation positions from between the two arch ribs using hoisting equipment. In this method, since the length of the steel beam segment is greater than the distance between the two arch ribs, and the width of the steel beam segment is less than the distance between the two arch ribs, hoisting equipment is used to lift the steel beam segments from the outside of the arch ribs to the area below the horizontal tie rods of the arch ribs, parallel to the bridge. Subsequently, temporary fixing points are set on the arch ribs, and the fixing points of the arch ribs are transferred from the hoisting equipment to the temporary fixing points so that the cable-stayed hoisting equipment can be moved from the area between the two arch ribs to the area outside the two arch ribs. Finally, the construction of all steel beam segments is completed using this method.

[0027] Based on the above measures, compared with traditional cable-stayed hoisting equipment, the main beam can be hoisted directly onto the arch rib hoisting platform during the construction of a tied-arch bridge with a lower deck, eliminating the need for a separate steel beam hoisting platform. This reduces the construction of temporary facilities during construction, saves time, lowers costs, and effectively avoids resource waste. Furthermore, by avoiding the construction of underwater work platforms, it has significant implications for water environment protection. Attached Figure Description

[0028] Fig. 1 This is a front view of the first hoisting operation provided in an embodiment of the present invention;

[0029] Fig. 2 This is a top view of an embodiment provided by the present invention;

[0030] Fig. 3 This is a front view of the second hoisting operation provided in an embodiment of the present invention;

[0031] Fig. 4 This is a top view of the bridge when the steel beam segments provided in the embodiment of the present invention are not installed on the bridge;

[0032] Fig. 5 This is a top view of a bridge when the steel beam segments provided in this embodiment of the invention are installed on the bridge.

[0033] Fig. 6 This is a top view of a bridge after the steel beam segments of an embodiment of the present invention have been installed on the bridge.

[0034] In the diagram, 1. Arch rib; 2. Steel beam segment; 3. Horizontal tie rod; 4. Temporary lifting point; 5. Lifting equipment; 5-1. Cable crane; 5-11. Cable tower; 5-12. Main cable; 5-13. Cable saddle; 5-2. Steering device; 6. Water surface; 7. Lifting platform; 8. Steering area; 9. Lifting rod. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] Reference Figs. 1-6 As shown, this invention provides a method for hoisting steel beam segments in a bottom-bearing tied-arch bridge.

[0037] Example 1

[0038] After the arch rib 1 is closed, the steel beam segment 2 is hoisted parallel to the bridge to the area below the horizontal tie rod 3 of the arch rib, and then rotated horizontally by 90°. Temporary lifting points 4 are set up below the arch rib, and the steel beam segment is fixed to these points. The cable crane 5-1 of the hoisting equipment 5 is moved from the area between the arch ribs to the area outside the arch ribs, and the steel beam segment is switched back to a state of suspension on the cable crane. The installation of the steel beam segment is then completed. In the embodiment shown in the figure, the bridge spans the water surface 6.

[0039] Because multiple connecting components exist between the arch ribs after closure (such as transverse supports connecting the two arch ribs), steel beam segments cannot be moved from between the two arch ribs to their installation positions using hoisting equipment. In this method, since the length of the steel beam segment is greater than the minimum distance between the two arch ribs, and the width of the steel beam segment is less than the distance between the two arch ribs, hoisting equipment is used to lift the steel beam segments parallel to the bridge from the outside of the arch ribs to the area below the horizontal tie rods of the arch ribs. Subsequently, temporary fixing points are set on the arch ribs, and the fixing points of the arch ribs are transferred from the hoisting equipment to the temporary fixing points so that the cable-stayed hoisting equipment can be moved from the area between the two arch ribs to the area outside the two arch ribs. Finally, the construction of all steel beam segments is completed using this method.

[0040] Based on the above measures, compared with traditional cable-stayed hoisting equipment, the main beam can be hoisted directly onto the arch rib hoisting platform during the construction of a tied-arch bridge with a lower deck, eliminating the need for a separate steel beam hoisting platform. This reduces the construction of temporary facilities during construction, saves time, lowers costs, and effectively avoids resource waste. Furthermore, by avoiding the construction of underwater work platforms, it has significant implications for water environment protection.

[0041] Example 2

[0042] The steps and principles of Example 2 are similar to those of Example 1, except that: based on the above method, preferred steps for implementing the above method are given, and the specific steps are as follows:

[0043] S1: The assembled steel beam segment is lifted from the lifting platform 7 to the turning area 8 below the arch rib;

[0044] S2: The steel beam segment is horizontally rotated 90° in the turning area using hoisting equipment;

[0045] S3: Temporarily fix the steel beam segments by pre-arranging temporary lifting points under the arch ribs in the turning area;

[0046] S4: Release the cable crane hooks and move the upstream and downstream cable cranes to the outside of the arch rib respectively;

[0047] S5: The cable hoist will lift the steel beam to the mid-span through the lifting points on the steel beams located on the outside of the arch rib;

[0048] S6: After fine-tuning and positioning, connect the steel beam segment to the hanger 9.

[0049] like Figs. 4-6 As shown, in this specific step, the installation of the steel beam segments that allow bending on the arch rib is completed by repeating steps S1-S6 multiple times.

[0050] Example 3

[0051] The steps and principles of Example 3 are similar to those of Example 2, except that an installation device is provided, but the installation device is not limited to this example. The installation device includes a cable crane and a turning device 5-2, both of which are existing mature structures. Appropriate specifications of equipment are adopted according to construction requirements. The cable crane includes cable towers 5-11 located on both sides of the bridge, two sets of main cables 5-12 connected between the cable towers, and a saddle 5-13 located between the cable towers and the main cables. The spacing between the two sets of main cables is adjusted by the saddle. A suspension cable is provided on the main cable. The bottom of the suspension cable is connected to the steel beam segment through the turning device.

[0052] In this embodiment, the steering device is adjusted and connected between the hoisting cable and the steel beam segment. After the steel beam segment is hoisted from the outside of the arch rib to the steering area below the arch rib, the steering device rotates the steel beam segment horizontally by 90°. With the steel beam segment temporarily fixed, the spacing between the two sets of main cable supports is adjusted by the saddle in the hoisting equipment, thereby adjusting the spacing between the two sets of hoisting cables. This achieves the purpose of switching the hoisting cables of the two sets of main cables from between the arch ribs to the outside of both sides of the arch ribs.

[0053] In the embodiment shown in the figure, the lifting area is set at one end of the arch rib, and the steel beam segments are installed from the end of the bridge away from the lifting area toward the end closer to the lifting area.

[0054] Example 4

[0055] The steps and principles of Example 4 are similar to those of Example 2, except that a turning area and hoisting trajectory are given.

[0056] Specifically, a lifting area is selected at both ends of the region between the two arch ribs, and the length of the lifting area is greater than the length of the steel beam segment; the steel beam segment can move vertically from top to bottom without obstruction or interference; the part of the lifting area below the temporary horizontal tie rod between the arch ribs is used as the turning area.

[0057] In this embodiment, at the lifting area, the steel beam segment is directly lifted from the upper side of the arch rib to the area below the temporary horizontal tie rod of the arch rib using lifting equipment, and then rotated horizontally by 90° at that location (i.e., the turning area). In this embodiment, the lifting trajectory of the steel beam segment from the outside of the arch rib to the bottom of the temporary horizontal tie rod of the arch rib is L-shaped.

[0058] Example 5

[0059] The steps and principles of Example 5 are similar to those of Example 2, except that another form of turning area and hoisting trajectory is given.

[0060] Specifically, a lifting area is selected at both ends of the region between the two arch ribs, and there is an obstruction at the upper end of this area near the middle of the bridge; the length of the lifting area is greater than the length of the steel beam segment, and the length of the area near the end of the bridge is greater than the length between the nearest lifting point to one end of the steel beam segment and the other end; the steel beam segment moves vertically from top to bottom without obstruction or interference below the obstruction; the part of this area below the temporary horizontal tie rod between the arch ribs is designated as the turning area.

[0061] In this embodiment, if there is no lifting area without obstructions as described in the first type mentioned above between the arch ribs, a less desirable option is to find areas with obstructions at both ends of the bridge where the lifting trajectory can be altered to enter the lower transfer area. Specifically, the lifting equipment is first moved laterally to bring the steel beam segment to the area below the obstruction, and then vertically lifted to move the steel beam segment to the turning area. In this embodiment, the lifting trajectory of the steel beam segment from the outside of the arch rib to the bottom of the temporary horizontal tie rod of the arch rib is type 7.

[0062] In embodiments 1-5, preferably, the lifting platform is set on the ground at the end of the bridge where the lifting area is located.

[0063] In Examples 1-5, to facilitate the hoisting of steel beam segments, two sets of lifting points are provided on the steel beam segments. The spacing between the lifting points in one set is less than the width between the two side arch ribs, while the spacing between the lifting points in the other set is greater than the width between the two side arch ribs. By setting two sets of lifting points, the hoisting process at both ends of the steel beam segments during installation is satisfied.

[0064] The present invention also provides

[0065] A construction method for a bottom-bearing tied-arch bridge includes the following steps:

[0066] S1: Carry out construction preparations, such as site leveling and setting up hoisting equipment;

[0067] S2: Hoist the arch ribs and close the closure, install temporary horizontal tie rods and tension them;

[0068] S3: Based on the above-mentioned hoisting method for steel beam segments in the under-bearing tied arch bridge, the steel beam segments are hoisted and joined together;

[0069] S4: Install permanent tie rods and remove temporary horizontal tie rods;

[0070] S5: Construction of bridge deck paving, completion of arch bridge construction.

[0071] The above are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent changes made in accordance with the claims of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for hoisting steel beam segments in a tied-arch bridge with a lower deck, characterized in that: After the arch ribs are closed, the steel beam segments are hoisted to the area below the horizontal tie rods of the arch ribs in a parallel position to the bridge, and the steel beams are rotated horizontally by 90°. Temporary lifting points are set up below the arch ribs, and the steel beam segments are fixed to the temporary lifting points. The cable hoist of the hoisting equipment is moved from the area between the arch ribs to the area outside the arch ribs, and the steel beam segments are switched back to the state of being suspended on the cable hoist. The installation of the steel beam segments is then completed. The specific steps are as follows: S1: The assembled steel beam segments are lifted from the lifting platform to the turning area below the arch rib; S2: The steel beam segment is horizontally rotated 90° in the turning area using hoisting equipment; S3: Temporarily fix the steel beam segments by pre-arranging temporary lifting points under the arch ribs in the turning area; S4: Release the cable crane hooks and move the upstream and downstream cable cranes to the outside of the arch rib respectively; S5: The cable hoist will lift the steel beam to the mid-span through the lifting points on the steel beams located on the outside of the arch rib; S6: After fine-tuning and positioning, connect the steel beam segment to the hanger.

2. The method for hoisting steel beam segments in a tied-arch bridge with a lower support as described in claim 1, characterized in that: The hoisting equipment includes cable cranes and steering devices, both of which are existing, mature structures. Appropriate specifications of equipment are adopted according to construction requirements. The cable crane equipment includes cable towers located on both sides of the bridge, two sets of main cables connected between the cable towers, and cable saddles located between the cable towers and the main cables. The spacing between the two sets of main cables is adjusted by the cable saddles. Suspension cables are installed on the main cables. The bottom of the suspension cables is connected to the steel beam segments through the steering devices.

3. The method for hoisting steel beam segments in a tied-arch bridge with a lower support as described in claim 1, characterized in that: Select a lifting area at both ends of the region between the two arch ribs. The length of the lifting area should be greater than the length of the steel beam segment. Ensure that the steel beam segment moves vertically from top to bottom without obstruction or interference. The part of the lifting area below the temporary horizontal tie rod between the arch ribs should be used as the turning area.

4. The method for hoisting steel beam segments in a tied-arch bridge with a lower support as described in claim 1, characterized in that: Select a lifting area at both ends of the region between the two arch ribs, where there is an obstruction at the upper end of the region near the middle of the bridge; the length of the lifting area is greater than the length of the steel beam segment, and the length of the area near the end of the bridge is greater than the length between the nearest lifting point to one end of the steel beam segment and the other end; ensure that there is no obstruction or interference during the vertical movement of the steel beam segment from top to bottom below the obstruction; the part of this region below the temporary horizontal tie rod between the arch ribs is designated as the turning area.

5. The method for hoisting steel beam segments in a tied-arch bridge with a lower support as described in claim 3 or 4, characterized in that: The lifting platform is set on the ground at the end of the bridge where the lifting area is located.

6. The method for hoisting steel beam segments in a tied-arch bridge with a lower support as described in claim 1, characterized in that: Two sets of lifting points are provided on the steel beam segment. The spacing between the lifting points in one set is smaller than the width between the two arch ribs, while the spacing between the lifting points in the other set is larger than the width between the two arch ribs.

7. A construction method for a bottom-bearing tied-arch bridge, characterized in that: Includes the following steps: S1: Prepare for construction; S2: Hoist the arch ribs and close the closure, install temporary horizontal tie rods and tension them; S3: The steel beam segment is hoisted and joined together according to the hoisting method of the under-bearing basket-tied arch bridge as described in any one of claims 1-6; S4: Install permanent tie rods and remove temporary horizontal tie rods; S5: Construction of bridge deck paving, completion of arch bridge construction.

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