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

Abstract

The invention 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] The invention belongs to the technical field of steel bridges, and in particular relates to a movable modular steel bridge suitable for extra-heavy load traffic in open-pit mines. Background Art

[0002] Mining, stripping and transportation is one of the most important production processes in open-pit mining. Its efficient operation can effectively save the infrastructure investment of open-pit mines, increase ore output, reduce ore costs and improve labor productivity. Its main tasks are to transport the ore mined from the mine to the beneficiation plant, crushing station or storage yard, transport the stripped waste rock to the spoil dump, and transport the personnel, materials and equipment required in the production process to the designated work site.

[0003] In order to improve transportation safety and reliability, the stripping transportation system and the raw coal transportation system are generally separated from each other. The separated transportation systems will lead to a sharp increase in the stripping transportation distance. In order to shorten the transportation distance of the stripping vehicles and realize double-circulation transportation, the stripping transportation system is very likely to intersect with the raw coal transportation system. In addition, due to the heavy load of vehicles passing through open-pit mines, poor geological conditions, frequent changes in the location of the installation, and high investment in traditional structures, there are few application cases of heavy-duty overpasses in domestic open-pit coal mines, and there are no cases of overpasses suitable for extra-heavy loads, movable, and modular overpasses. Summary of the invention

[0004] In view of the above shortcomings, the purpose of the present invention is to provide a movable modular steel bridge suitable for extra-heavy-load traffic in open-pit mines. This structural system fills the gap in the domestic field of steel structure bridges suitable for the passage of extra-heavy-load mining trucks, and solves the problem of three-dimensional intersection of extra-heavy-load vehicles in open-pit mines.

[0005] The technical solution adopted by the invention is: a movable modular steel bridge suitable for extremely heavy-load traffic in open-pit mines. The technical key points are: it includes a main beam formed by splicing multiple steel boxes through connecting plates, an anti-collision beam connected to both sides of the main beam, a steel cap beam arranged under the main beam, and a steel lattice bridge pier located under the steel cap beam. A shock-absorbing bearing is installed between the main beam and the steel cap beam, and a stress dispersion pavement layer that diffuses the vehicle load to the top plate is laid between adjacent anti-collision beams. The steel cap beam is fixedly connected to the steel lattice bridge pier through a flange, and adjacent steel cap beams are connected through a pier horizontal force dispersion device.

[0006] Preferably, the steel box comprises a closed box structure formed by welding a top plate, a bottom plate, a web plate, a transverse partition and reinforcing transverse ribs, and transverse partitions and reinforcing transverse ribs are alternately arranged in the box along the longitudinal direction of the bridge.

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

[0008] Preferably, the transverse partition is provided with a manhole for connecting two adjacent steel boxes.

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

[0010] Preferably, the high-performance stress dispersion layer is a structural layer formed by pouring and curing high-performance concrete on the stress dispersion grid plate and the steel bridge deck to form an integrated structure.

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

[0012] Preferably, the waterproof adhesive stress absorbing layer is prepared by hot-sprinkling gravel of a certain particle size on high-viscosity and high-elasticity modified asphalt, and then rolling the gravel so that the gravel is completely embedded in the asphalt to form a structural layer in which the gravel is wrapped in asphalt.

[0013] Preferably, the horizontal force dispersion device of the 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 a built-in anchor for anchoring the cable, the anchor is welded with a guide rod for pre-tensioning, and 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 embedded bolts, and the cable passes from one adjacent steel anchor seat to another and is respectively fixedly connected to anchors in the respective steel anchor seats.

[0015] The beneficial effects of the present invention are as follows: the movable modular steel bridge suitable for heavy-load traffic in open-pit mines adopts a steel box girder bridge, which has high bending and torsional rigidity and is suitable for heavy-load traffic conditions in mining areas. Its cross-sectional form adopts a separated multi-box form, and is a closed thin-walled box structure formed by welding components such as a top plate, a web plate and a bottom plate. In order to increase the integrity and rigidity of the box, transverse diaphragms and reinforcing transverse ribs are arranged at a certain interval along the longitudinal direction of the bridge in the box to enhance the overall force-bearing performance of the bridge; on the one hand, the steel bridge disperses the pressure of vehicle loads on the steel bridge deck by arranging a high-performance stress dispersion layer, which can greatly reduce The local stress concentration caused by wheel load is reduced, and the fatigue cracking problem of orthotropic bridge deck is alleviated. On the other hand, the interfacial bonding strength and shear strength between the high-performance stress dispersion layer and the modified asphalt concrete wear layer can be enhanced by setting a waterproof bonding stress absorption layer, and the cracks in the lower layer can be prevented from reflecting to the modified asphalt concrete wear layer, which greatly improves the service life of the steel bridge under heavy-duty traffic. The horizontal force dispersion device of the steel bridge pier can transmit the horizontal force generated by the large mining car on the pier to the adjacent pier through the cable, effectively solving the problem of insufficient lateral stiffness of the pier and improving the safety performance of the bridge. The structure is simple and compact, and is a modular splicing structure designed as a whole, which is easy to process and manufacture. The structure is a plurality of steel boxes bolted to each other, which is convenient for splicing and disassembly operations, with high assembly and disassembly efficiency and high connection strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

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

[0019] Figure 3 It is a structural schematic diagram of the main beam of the present invention;

[0020] Figure 4 is a cross-sectional schematic diagram of the main beam of the present invention;

[0021] Figure 5 It is a schematic diagram of the connection of the main beam of the present invention;

[0022] Figure 6 It is a structural schematic diagram of the steel box of the present invention;

[0023] Figure 7 It is a schematic diagram of the internal structure of the steel box of the present invention;

[0024] Figure 8 It is a schematic diagram of the stress dispersion paving of the present invention;

[0025] Fig. 9 It is a cross-sectional schematic diagram of the stress dispersion pavement of the present invention;

[0026] Fig.10 It is a schematic diagram of laying the stress dispersion grid plate of the present invention;

[0027] Fig.11 A schematic diagram of a bridge pier stress dispersion device according to the present invention;

[0028] Fig.12 It is a schematic diagram of the horizontal force dispersing device of the bridge pier of the present invention;

[0029] The serial numbers in the figure are explained as follows: 1-main beam; 11-steel box; 111-top plate; 112-bottom plate; 113-web plate; 114-manhole; 115-stiffening 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 adhesive stress absorption layer; 33-modified asphalt concrete wear layer; 4-shock-absorbing bearing; 5-steel cap beam; 6-steel truss pier; 7-pier horizontal force dispersion device; 71-cable; 72-anchor structure; 721-steel anchor seat; 722-anchor; 723-guide rod; 724-nut. DETAILED DESCRIPTION

[0030] To make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the following is a brief description of the present invention in conjunction with the attached Figures 1 to 12 The present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

[0031] The present embodiment adopts a movable high-load steel box girder bridge suitable for open-pit mining operation areas, including a main beam 1, which is composed of a plurality of steel boxes 11 spliced ​​by connecting plates 12 and high-strength bolts 13, and anti-collision beams 2 are connected to both sides of the main beam 1, and stress dispersion pavement 3 is laid between each anti-collision beam 2, and a steel cap beam 5 is provided below the main beam 1, and a shock-absorbing support 4 is installed between the main beam 1 and the steel cap beam 5. The steel cap beam 5 is fixedly connected to the steel truss bridge pier 6 located below it through a flange, and the bridge pier horizontal force dispersion device 7 is fixed to the adjacent steel cap beam 5 by bolts.

[0032] The steel box structure of this embodiment is as follows Figure 6 , 7As shown, the steel box 11 is a closed box structure formed by welding a top plate 111, a bottom plate 112, a web 113, a diaphragm 114 and a stiffening transverse rib 115. A plurality of diaphragms 114 are arranged between the top plate 111 and the bottom plate 112, and stiffening transverse ribs 115 are arranged at a certain interval along the longitudinal direction of the bridge in the box. In this embodiment, U-shaped stiffening ribs and I-shaped stiffening ribs are welded longitudinally on the top plate 111 and the bottom plate 112, respectively, and the stiffening ribs are closely arranged. A manhole is provided on the diaphragm 114, and two adjacent steel boxes 11 are connected through the manhole.

[0033] In this embodiment, a stress dispersing pavement layer 3 of a certain thickness is laid on the top plate 111 of the steel box, which not only provides a driving support for the mine car, but also plays a role in spreading the vehicle load to the top plate. The schematic diagram of the stress dispersing pavement layer described in this embodiment is shown in FIG. Figure 8 , 9 As shown, the stress dispersion pavement layer 3 includes a high-performance stress dispersion layer 31, a waterproof bonding stress absorption layer 32 and a modified asphalt concrete wear layer 33. The high-performance stress dispersion layer 31 is a structural layer formed by pouring and curing high-performance concrete 312 on the stress dispersion grid plate 311 and the steel box top plate 111 to form an integrated structure. Fig.10 As shown, the stress dispersion grid plate 311 is only laid at the wheel track. The waterproof bonding stress absorption layer 32 is made by hot-sprinkling gravel of a certain particle size on the high-viscosity and high-elasticity modified asphalt, and then rolling it so that the gravel is completely embedded in the asphalt to form a structural layer of asphalt wrapped gravel; the modified asphalt concrete wear layer 33 has a thickness of 5 to 10 cm. The amount of high-viscosity and high-elasticity modified asphalt in this embodiment is 2.2 to 2.5 kg / m 2 The amount of crushed stone spread is 14-16 kg / m 2 , particle size is 9.5~13.2mm.

[0034] like Fig.11 , 12 As shown, the bridge pier horizontal force dispersing 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 anchored to the cable 71. The anchor 722 is welded with a guide rod 723 for pre-tensioning. The anchoring end of the guide rod 723 is fixed by a nut 724.

[0035] This embodiment takes the connection of the horizontal force dispersing device of the bridge pier between two adjacent steel cap beams as an example for explanation. In this embodiment, the first anchoring structure 72 is bolted to the first steel cap beam by bolts, and the second anchoring structure is bolted to the second steel cap beam by bolts. The cable 71 of the first anchoring structure 72 is inserted from one end of the adjacent steel anchor seat 721 in sequence, and one end of the cable 71 passes through the anchor 722 and is fixed by the nut 724, and the other end enters through the side through hole of the second anchoring structure and then passes through the anchor of the second anchoring structure and is fixed by another nut. After the two are connected, a horizontal force dispersing device for the bridge pier is formed. According to the above connection method, the above structure is installed between every two steel cap beams, and the cable 71 is pre-tightened. When the cable 71 is tensioned, the cable is tensioned in stages from one end of the steel truss bridge pier 6 to the other end, so that the pre-tension in the cable 71 can reach the design requirement value.

[0036] The present embodiment adopts a construction method of a movable high-load bearing steel box girder bridge suitable for an open-pit mining operation area, comprising the following steps:

[0037] 1) Assess the topography, geological conditions and mining operation requirements of the bridge site, and make use of the open-pit mining end wall as much as possible for the bridge abutment;

[0038] 2) Construct the foundation of steel truss pier 6 to ensure that it can withstand the bridge load and possible hydrogeological influences;

[0039] 3) Install the steel truss pier 6 and ensure its stability and verticality;

[0040] 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 tighten all high-strength bolts with a wrench to ensure a firm connection.

[0041] 5) The steel box 11 is manufactured in the prefabrication factory, including welding, painting and other processes. The prefabricated steel box 11 is transported to the construction site, and is spliced ​​into the main beam 1 through the connecting plate 12 and high-strength bolts 13, and the main beam 1 is hoisted into place using a crane.

[0042] 6) Place the shock-absorbing support 4 at a predetermined position between the main beam 1 and the steel cap beam 5, and use high-strength bolts or other connecting parts to fix the shock-absorbing support 4 to the main beam 1 and the steel cap beam 5.

[0043] 7) Install an anti-collision beam 2 on the main beam 1, lay a stress dispersion pavement 3, and set a pier horizontal force dispersion device 7 to enhance the overall performance and safety of the bridge.

[0044] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A movable modular steel bridge suitable for heavy-load traffic in open-pit mines, characterized in that: It includes a main beam formed by multiple steel boxes spliced ​​together by connecting plates, an anti-collision beam connected to both sides of the main beam, a steel cap beam arranged under the main beam, and a steel lattice bridge pier located under the steel cap beam. A shock-absorbing bearing is installed between the main beam and the steel cap beam, and a stress dispersion pavement layer for diffusing the vehicle load to the top plate is laid between adjacent anti-collision beams. The steel cap beam is fixedly connected to the steel lattice bridge pier through a flange, and adjacent steel cap beams are connected through a bridge pier horizontal force dispersion device.

2. A movable modular steel bridge suitable for heavy-load traffic in open-pit mines as claimed in claim 1, characterized in that: The steel box comprises a closed box structure formed by welding a top plate, a bottom plate, a web plate, a transverse partition and a reinforcing transverse rib. The transverse partition and the reinforcing transverse rib are alternately arranged in the box along the longitudinal direction of the bridge.

3. A movable modular steel bridge suitable for heavy-load traffic in open-pit mines as claimed in claim 1, characterized in that: U-shaped longitudinal stiffening ribs and I-shaped longitudinal stiffening ribs are welded longitudinally on the top plate and the bottom plate respectively, and a plurality of transverse connecting plates are arranged on the outer side of the web plate, and two transversely adjacent steel box beam sections are connected via the transverse connecting plates.

4. A movable modular steel bridge suitable for heavy-load traffic in open-pit mines as claimed in claim 1, characterized in that: The transverse partition is provided with a manhole for connecting two adjacent steel boxes.

5. The movable modular steel bridge suitable for heavy-load traffic in open-pit mines as claimed in claim 1, characterized in that: The stress dispersion pavement layer comprises a high-performance stress dispersion layer, a waterproof bonding stress absorption layer and a modified asphalt concrete wear layer.

6. A movable modular steel bridge suitable for heavy-load traffic in open-pit mines as claimed in claim 5, characterized in that: The high-performance stress dispersion layer is an integrated structural layer formed by pouring and curing high-performance concrete on the stress dispersion grid plate and the steel bridge deck.

7. A movable modular steel bridge suitable for heavy-load traffic in open-pit mines as claimed in claim 5, characterized in that: The stress dispersion grid plate is only laid at the wheel track line.

8. The movable modular steel bridge suitable for heavy-load traffic in open-pit mines as claimed in claim 5, characterized in that: The waterproof bonding stress absorbing layer is formed by hot-spreading crushed stones of a certain particle size on the high-viscosity and high-elasticity modified asphalt, and then rolling the crushed stones so that the crushed stones are completely embedded in the asphalt to form a structural layer of asphalt wrapped crushed stones.

9. The movable modular steel bridge suitable for heavy-load traffic in open-pit mines as claimed in claim 1, characterized in that: The horizontal force dispersion device of the 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 a built-in anchor for anchoring the cable. 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. The movable modular steel bridge suitable for heavy-load traffic in open-pit mines as claimed in claim 1, characterized in that: The anchoring structure is bolted to the steel cap beam through embedded bolts, and the cable passes through one of the adjacent steel anchor seats and is respectively fixedly connected to the anchors in the respective steel anchor seats.

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