Movable modular steel bridge suitable for strip mine extra-heavy traffic

Abstract

The utility model discloses a movable modular steel bridge suitable for strip mine extra-heavy traffic, and belongs to the technical field of steel bridges. Comprising a main beam formed by splicing a plurality of steel boxes through connecting plates, anti-collision beams connected to the two sides of the main beam, a steel cover beam arranged below the main beam and a steel lattice type pier located below the steel cover beam. The steel box girder bridge is adopted, has high bending resistance and torsional rigidity and is suitable for traffic conditions of extra-heavy loads in mining areas, the section form of the steel box girder bridge is a separated multi-box form, the steel bridge is provided with the high-performance stress dispersion layer, pressure of vehicle loads on the steel bridge deck is dispersed, local stress concentration caused by the wheel load effect can be greatly reduced, and the service life of the steel bridge deck is prolonged. The steel bridge pier horizontal force dispersing device can transfer horizontal force generated on the pier when a large mine car is braked to the adjacent pier through the inhaul cable, the problem that the lateral stiffness of the pier is insufficient is effectively solved, and the safety performance of a bridge is improved.

Description

Technical Field

[0001] This utility model belongs to the field of steel bridge technology, and specifically relates to a movable modular steel bridge suitable for heavy-duty traffic in open-pit mines. Background Technology

[0002] Mining, stripping, and transportation are among the most important production processes in open-pit mining. Their efficient operation can effectively save on infrastructure investment, increase ore production, reduce ore costs, and improve labor productivity. Their main tasks are to transport the ore mined from the mine to the concentrator, crushing station, or storage yard, transport the stripped waste rock to the spoil heap, and transport the personnel, materials, and equipment required in the production process to the designated work sites.

[0003] To improve transportation safety and reliability, the stripping and raw coal transportation systems are generally separated, which leads to a sharp increase in stripping distance. To shorten the stripping vehicle transportation distance and achieve dual-loop transportation, the stripping and raw coal transportation systems are highly likely to intersect. Furthermore, due to the heavy loads of vehicles traveling in open-pit mines, poor geological conditions, frequent changes in installation locations, and high investment costs of traditional structures, there are very few application cases of heavy-duty grade-separated overpasses in domestic open-pit coal mines, and no cases of grade-separated overpasses suitable for extra-heavy loads, movable overpasses, or modular overpasses exist. Summary of the Invention

[0004] To address the above shortcomings, the purpose of this utility model is to provide a movable modular steel bridge suitable for heavy-duty traffic in open-pit mines. This structural system fills the gap in the domestic field of steel structure bridges suitable for heavy-duty mining trucks and solves the problem of grade-separated intersections of heavy-duty vehicles in open-pit mines.

[0005] The technical solution adopted by the utility model is: a movable modular steel bridge suitable for heavy-duty traffic in open-pit mines. Its key technical points are: a main beam spliced ​​from multiple steel boxes by connecting plates, anti-collision beams connected to both sides of the main beam, a steel cap beam set below the main beam, and a steel lattice pier located below the steel cap beam. Vibration damping supports are installed between the main beam and the steel cap beam. A stress-dispersing pavement layer is laid between adjacent anti-collision beams to spread the vehicle load to the top plate. The steel cap beam is fixedly connected to the steel lattice pier through flanges. Adjacent steel cap beams are connected by a horizontal force dispersion device on the pier.

[0006] Preferably, the steel box comprises a closed box structure formed by welding a top plate, a bottom plate, a web plate, diaphragms, and reinforcing ribs, with diaphragms and reinforcing ribs alternately arranged along the longitudinal direction of the bridge inside the box.

[0007] Preferably, U-shaped longitudinal stiffening ribs and I-shaped longitudinal stiffening ribs are welded to the top plate and bottom plate respectively, and multiple transverse connecting plates are provided on the outer side of the web plate to connect two adjacent steel box girder segments in the transverse direction.

[0008] Preferably, the partition plate is provided with a manhole that connects two adjacent steel boxes.

[0009] Preferably, the stress-dispersing pavement layer includes a high-performance stress-dispersing layer, a waterproof bonding stress-absorbing layer, and a modified asphalt concrete wear-resistant layer.

[0010] Preferably, the high-performance stress-dispersing layer is a structural layer formed by pouring and curing high-performance concrete on top of the stress-dispersing grid plate and the steel bridge deck.

[0011] Preferably, the stress-dispersing grid plate is laid only at the wheel track line.

[0012] Preferably, the waterproof bonding stress-absorbing layer is formed by hot sprinkling crushed stone of a certain particle size onto high-viscosity and high-elasticity modified asphalt, followed by compaction, so that the crushed stone is completely embedded in the asphalt, forming a structural layer in which the crushed stone is wrapped by asphalt.

[0013] Preferably, the horizontal force dispersing device for the bridge pier includes a cable and an anchoring structure. The anchoring structure includes a steel anchor seat, an anchor, a guide rod, and a nut. The steel anchor seat has an anchor for anchoring the cable built into it. The anchor is welded with a guide rod for pre-tensioning. The anchoring end of the guide rod is provided with a nut for fixing during tensioning.

[0014] Preferably, the anchoring structure is bolted to the steel cap beam by pre-embedded bolts, and the cable passes from one of the adjacent steel anchor seats into the other, and is respectively fixedly connected to the anchor in the respective steel anchor seat.

[0015] The beneficial effects of this utility model are as follows: This movable modular steel bridge, suitable for heavy-load traffic in open-pit mines, adopts a steel box girder bridge, possessing high bending and torsional stiffness, and is suitable for the heavy-load traffic conditions in mining areas. Its cross-section adopts a separated multi-box form, consisting of a closed thin-walled box structure formed by welding components such as a top plate, web plate, and bottom plate. To increase the overall integrity and stiffness of the box structure, transverse diaphragms and reinforcing ribs are installed at certain intervals along the longitudinal direction of the box to enhance the overall load-bearing performance of the bridge. Furthermore, this steel bridge, by incorporating a high-performance stress-dispersing layer, disperses the pressure of vehicle loads on the steel bridge deck, significantly reducing stress. This design reduces localized stress concentration caused by wheel loads, alleviating fatigue cracking in orthotropic bridge decks. Furthermore, the waterproof bonding stress-absorbing layer enhances the interfacial bond strength and shear strength between the high-performance stress-dispersing layer and the modified asphalt concrete wearing layer, preventing lower-layer cracks from reflecting back to the modified asphalt concrete wearing layer, thus significantly extending the service life of steel bridges under heavy traffic. The horizontal force dispersion device for the bridge piers transmits the horizontal force generated by large mining trucks during braking to adjacent piers via cables, effectively solving the problem of insufficient lateral stiffness of the piers and improving bridge safety. The structure is simple and compact, featuring a modular, spliced ​​design that facilitates manufacturing. Multiple steel boxes are bolted together, allowing for easy assembly and disassembly, resulting in high efficiency and strong connections. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 An elevation view of a movable high-load-bearing steel box girder bridge suitable for open-pit mining operations;

[0018] Figure 2 This is a cross-sectional view of a movable high-load-bearing steel box girder bridge suitable for open-pit mining operations;

[0019] Figure 3 This is a schematic diagram of the main beam of this utility model;

[0020] Figure 4 This is a schematic cross-sectional view of the main beam of this utility model;

[0021] Figure 5 This is a schematic diagram of the connection of the main beam of this utility model;

[0022] Figure 6 This is a schematic diagram of the steel box structure of this utility model;

[0023] Figure 7 This is a schematic diagram of the internal structure of the steel box of this utility model;

[0024] Figure 8 This is a schematic diagram of the stress-dispersing paving method of this utility model;

[0025] Figure 9 This is a cross-sectional schematic diagram of the stress-dispersing paving of this utility model;

[0026] Figure 10 This is a schematic diagram of the laying of the stress dispersion grid plate of this utility model;

[0027] Figure 11 This is a schematic diagram of the bridge pier stress dispersion device in use according to this utility model;

[0028] Figure 12 This is a schematic diagram of the stress dispersion device for bridge piers according to this utility model. The numbers in the diagram are explained as follows: 1-Main beam; 11-Steel box girder; 111-Top plate; 112-Bottom plate; 113-Web plate; 114-Manhole; 115-Strengthening transverse rib; 12-Connecting plate; 13-High-strength bolt; 2-Anti-collision beam; 3-Stress dispersion pavement layer; 31-High-performance stress dispersion layer; 311-Stress dispersion grid plate; 312-High-performance concrete; 32-Waterproof bonding stress absorption layer; 33-Modified asphalt concrete wearing layer; 4-Shock-absorbing bearing; 5-Steel cap beam; 6-Steel truss pier; 7-Pier horizontal force dispersion device; 71-Cable; 72-Anchoring structure; 721-Steel anchor seat; 722-Anchorage; 723-Guide rod; 724-Nut. Detailed Implementation

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the following description is provided in conjunction with the appendix. Figures 1-12 The present invention will be further described in detail below with reference to specific embodiments.

[0030] This embodiment employs a movable high-load-bearing steel box girder bridge suitable for open-pit mining operations. It includes a main girder 1, which is constructed from multiple steel boxes 11 joined together by high-strength bolts 13 via connecting plates 12. Anti-collision beams 2 are connected to both sides of the main girder 1, and stress-dispersing pavement 3 is laid between each anti-collision beam 2. A steel cap beam 5 lies beneath the main girder 1, and shock-absorbing supports 4 are installed between the main girder 1 and the steel cap beam 5. The steel cap beam 5 is fixedly connected to a steel truss pier 6 located below it via flanges, while the horizontal force dispersion device 7 of the pier is fixed to the adjacent steel cap beam 5 by bolts.

[0031] The steel box structure in this embodiment is as follows: Figure 6 , 7As shown, the steel box 11 is a closed box structure formed by welding together a top plate 111, a bottom plate 112, a web plate 113, transverse diaphragms 114, and stiffening ribs 115. Multiple transverse diaphragms 114 are arranged between the top plate 111 and the bottom plate 112, and stiffening ribs 115 are arranged at certain intervals along the longitudinal direction of the bridge within the box. In this embodiment, the top plate 111 and the bottom plate 112 are respectively welded with U-shaped stiffening ribs and I-shaped stiffening ribs in the longitudinal direction, and the stiffening ribs are arranged closely. Manholes are provided on the transverse diaphragms 114, and adjacent steel boxes 11 are connected through these manholes.

[0032] In this embodiment, a stress-dispersing pavement layer 3 of a certain thickness is laid above the steel box roof slab 111, which not only provides a path for mine cars to travel but also serves to distribute the vehicle load to the roof slab. A schematic diagram of the stress-dispersing pavement layer described in this embodiment is shown below. Figure 8 , 9 As shown, the stress-dispersing pavement layer 3 includes a high-performance stress-dispersing layer 31, a waterproof bonding stress-absorbing layer 32, and a modified asphalt concrete wearing layer 33. The high-performance stress-dispersing layer 31 is a structural layer formed by casting and curing high-performance concrete 312 on top of the stress-dispersing grid plate 311 and the steel box roof plate 111. Figure 10 As shown, the stress-dispersing grid plate 311 is only laid along the wheel tracks. The waterproof bonding stress-absorbing layer 32 is formed by hot-spreading crushed stone of a certain particle size onto high-viscosity, high-elasticity modified asphalt, followed by compaction, so that the crushed stone is completely embedded in the asphalt, forming a structural layer in which the crushed stone is encapsulated by asphalt; the thickness of the modified asphalt concrete wearing layer 33 is... In this embodiment, the amount of high-viscosity, high-elasticity modified asphalt used is... The amount of gravel sprinkled is: Particle size is .

[0033] like Figure 11 , 12 As shown, the pier horizontal force dispersion device 7 of this embodiment includes a cable 71 and an anchoring structure 72. The anchoring structure 72 includes a steel anchor seat 721, an anchor 722, a guide rod 723, and a nut 724. The steel anchor seat 721 has an anchor 722 embedded in it and anchored to the cable 71. The guide rod 723 for pre-tensioning is welded onto the anchor 722. The anchoring end of the guide rod 723 is fixed by the nut 724.

[0034] This embodiment uses the connection of a horizontal force dispersion device between two adjacent steel cap beams as an example for illustration. In this embodiment, the first anchoring structure 72 is bolted to the first steel cap beam, and the second anchoring structure is bolted to the second steel cap beam. The cable 71 of the first anchoring structure 72 passes through one end of the adjacent steel anchor seat 721 in sequence. One end of the cable 71 passes through the anchor 722 and is fixed by the nut 724, while the other end enters through the side through hole of the second anchoring structure, exits through the anchor of the second anchoring structure, and is fixed by another nut. The connection of the two constitutes the horizontal force dispersion device for the pier. According to the above connection method, the above structure is installed between every two steel cap beams, the cable 71 is pre-tightened, and when tensioning the cable 71, the cable is tensioned in stages from one end of the steel truss pier 6 to the other end, so that the pretension in the cable 71 reaches the design requirement value.

[0035] This embodiment adopts a construction method for a movable high-load-bearing steel box girder bridge, and the steps are as follows:

[0036] 1) Assess the topography, geological conditions and mining requirements of the bridge site, and utilize the open-pit mining end face of the bridge abutment as much as possible;

[0037] 2) Construct six steel truss bridge pier foundations to ensure they can withstand the bridge load and potential hydrogeological impacts;

[0038] 3) Install steel truss piers 6 and ensure their stability and verticality;

[0039] 4) With the cooperation of the crane operator, slowly move the steel cap beam 5 so that the flange at its bottom is aligned with the flange on the steel truss pier 6, and use a wrench to tighten all the high-strength bolts to ensure a firm connection.

[0040] 5) The steel box 11 is manufactured in the prefabrication plant, including welding, painting and other processes. The prefabricated steel box 11 is transported to the construction site and spliced ​​into the main beam 1 by connecting plates 12 and high-strength bolts 13. The main beam 1 is then hoisted into place by a crane.

[0041] 6) Place the damping bearing 4 at the predetermined position between the main beam 1 and the steel cap beam 5, and use high-strength bolts or other connectors to fix the damping bearing 4 to the main beam 1 and the steel cap beam 5.

[0042] 7) Install anti-collision beams 2 on the main beam 1, lay stress-dispersing pavement 3, and set up horizontal force dispersion devices 7 for the piers to enhance the overall performance and safety of the bridge.

[0043] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A movable modular steel bridge suitable for heavy-duty traffic in open-pit mines, characterized in that, It includes a main beam spliced ​​together from multiple steel boxes by connecting plates, anti-collision beams connected to both sides of the main beam, a steel cap beam set below the main beam, and a steel lattice pier located below the steel cap beam. Vibration damping bearings are installed between the main beam and the steel cap beam. A stress-dispersing pavement layer is laid between adjacent anti-collision beams to spread the vehicle load to the top plate. The steel cap beam is fixedly connected to the steel lattice pier by flanges. Adjacent steel cap beams are connected by a horizontal force dispersion device on the pier.

2. The movable modular steel bridge suitable for heavy-duty traffic in open-pit mines as described in claim 1, characterized in that, The steel box includes a closed box structure formed by welding a top plate, a bottom plate, a web plate, diaphragms, and reinforcing ribs. Diaphragms and reinforcing ribs are alternately arranged along the longitudinal direction of the bridge inside the box.

3. A movable modular steel bridge suitable for heavy-duty traffic in open-pit mines as described in claim 2, characterized in that, U-shaped longitudinal stiffening ribs and I-shaped longitudinal stiffening ribs are welded to the top plate and bottom plate respectively. Multiple transverse connecting plates are provided on the outer side of the web plate to connect two adjacent steel box girder segments in the transverse direction.

4. A movable modular steel bridge suitable for heavy-duty traffic in open-pit mines as described in claim 2, characterized in that, The diaphragm is provided with a manhole that connects two adjacent steel boxes.

5. A movable modular steel bridge suitable for heavy-duty traffic in open-pit mines as described in claim 1, characterized in that, The stress-dispersing pavement layer includes a high-performance stress-dispersing layer, a waterproof bonding stress-absorbing layer, and a modified asphalt concrete wear-resistant layer.

6. A movable modular steel bridge suitable for heavy-duty traffic in open-pit mines as described in claim 5, characterized in that, The high-performance stress-dispersing layer is a structural layer formed by pouring and solidifying high-performance concrete on top of the stress-dispersing grid plate and the steel bridge deck.

7. A movable modular steel bridge suitable for heavy-duty traffic in open-pit mines as described in claim 6, characterized in that, The stress-dispersing grid plate is only laid along the wheel track line.

8. A movable modular steel bridge suitable for heavy-duty traffic in open-pit mines as described in claim 5, characterized in that, The waterproof bonding stress-absorbing layer is formed by hot sprinkling crushed stone of a certain particle size onto high-viscosity and high-elasticity modified asphalt, followed by compaction, so that the crushed stone is completely embedded in the asphalt, forming a structural layer in which the crushed stone is wrapped by asphalt.

9. A movable modular steel bridge suitable for heavy-duty traffic in open-pit mines as described in claim 1, characterized in that, The horizontal force dispersion device for the bridge pier includes cables and an anchoring structure. The anchoring structure includes a steel anchor seat, an anchor, a guide rod, and a nut. The steel anchor seat has an anchor for anchoring the cables inside. The anchor is welded with a guide rod for pre-tensioning. The anchoring end of the guide rod is provided with a nut for fixing during tensioning.

10. A movable modular steel bridge suitable for heavy-duty traffic in open-pit mines as described in claim 9, characterized in that, The anchoring structure is bolted to the steel cap beam by pre-embedded bolts, and the cable passes from one of the adjacent steel anchor seats into the other, and is respectively fixedly connected to the anchor in the respective steel anchor seat.

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