Steel box structure, steel box girder, movable modular steel box girder bridge and manufacturing method

Abstract

The invention provides a steel box structure, a steel box girder, a movable modular steel box girder bridge and a manufacturing method, and relates to the technical field of bridge steel boxes, the steel box structure comprises a steel box, the steel box girder formed by combining the steel box structure and the movable modular steel box girder bridge comprising the steel box girder, the steel box is of a closed box body structure formed by welding a top plate, a bottom plate, webs, transverse partition plates and reinforcing transverse ribs, 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, the transverse partition plates and the reinforcing transverse ribs are arranged in the box body at certain intervals in the longitudinal direction of the bridge, a plurality of splice plates are arranged on the outer sides of the webs, and the splice plates are connected with the U-shaped longitudinal stiffening ribs and the I-shaped longitudinal stiffening ribs. And the two transversely adjacent steel box girder sections are connected through the connecting plates by adopting high-strength bolts. The structure system is simple and reliable, has high bearing capacity and high mounting and moving speed, and solves the problems that strip mine passing vehicles are large in load, the bridge arrangement position needs to be adjusted frequently, and a traditional structure is high in investment.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge steel boxes, and in particular relates to a steel box structure, a steel box girder, a movable modular steel box girder bridge and a manufacturing method. Background Art

[0002] During the production process of open-pit coal mines, the layout of transportation roads needs to be constantly adjusted to adapt to the changes in the terrain of the mine pit and the inner side of the open-pit mine pit, especially the intersection of the stripping road and the production system. As the mining and stripping project progresses, the frequent changes in these intersections place extremely high demands on the bridge structure. At present, domestic open-pit coal mines face many challenges in bridge construction: the location of the intersection changes rapidly, and traditional bridge structures are difficult to adapt; the bridge construction cycle is long, which has a great impact on production organization; the existing bridge structure is insufficient in timeliness and rapidity, and cannot meet the needs of high-efficiency production; lack of mobility, it is difficult to achieve rapid adjustment when the intersection position changes, and the belt conveyor production system is easily affected during the relocation process; in addition, the vehicles passing through the open-pit coal mine are heavy, which places higher requirements on the bearing capacity of the bridge structure.

[0003] At present, the box section is the most commonly used main beam section of steel box girder bridges. Compared with truss beams and combined beams, the box section has the advantages of light weight, high bending stiffness, quick installation, easy maintenance, simple appearance and beautiful appearance, so it has been widely used in engineering practice. However, the traditional single-box multi-chamber box section is difficult to erect and move on site due to its large size and weight, and is not suitable for the rapid adjustment of open-pit coal mine bridges. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a steel box structure, a steel box girder, a movable modular steel box girder bridge and a manufacturing method, that is, to decompose the box section into a plurality of modular units, so as to solve the problems of heavy loads of vehicles passing through open-pit mines, frequent adjustments of bridge settings and high investment in traditional structures.

[0005] The technical solution adopted by the present invention is: a steel box structure, the technical key points of which are: a closed box structure formed by welding a top plate, a bottom plate, a web plate, a transverse partition and a reinforcing transverse rib, in which transverse partitions and reinforcing transverse ribs are alternately arranged at a certain interval along the longitudinal direction of the bridge in the box, U-shaped longitudinal stiffening ribs and I-shaped longitudinal stiffening ribs are respectively welded in the longitudinal direction of the top plate and the bottom plate, a plurality of splicing plates are arranged on the outer side of the web, and two transversely adjacent steel box beam sections are connected through a connecting plate using high-strength bolts.

[0006] Furthermore, the top of the transverse partition is provided with a mounting groove for installing U-shaped longitudinal stiffening ribs, and the bottom thereof is provided with a through hole for allowing I-shaped longitudinal stiffening ribs to pass through. The transverse partition is also provided with a manhole for connecting two adjacent steel boxes.

[0007] Furthermore, a mounting groove for mounting a U-shaped stiffening rib is provided at the top of the reinforcing transverse rib, a first reinforcing plate is provided below the mounting groove, the first reinforcing plate is welded between the left and right webs, and a second reinforcing plate for reinforcing the vertical plate of the reinforcing transverse rib is provided below the first reinforcing plate, the second reinforcing plate is welded on the vertical plate and is located inside the steel box.

[0008] Furthermore, a splicing plate and a supporting plate are welded outside the web, and bolt holes are provided on the splicing plate for connecting two steel box girder sections.

[0009] A steel box beam structure, the technical key point of which is that it is composed of the above steel box structures.

[0010] A movable modular steel box girder bridge comprises the steel box girder structure.

[0011] A method for manufacturing a steel box, the technical main points of which are the following steps: S1. Place the top plate and the bottom plate on the assembly welding jig, accurately align the longitudinal baselines of the U-shaped longitudinal stiffening ribs and the I-shaped longitudinal stiffening ribs with the positioning lines on the top plate and the bottom plate, and then weld them; S2. Place the welded bottom plate on the horizontal frame, assemble the transverse partition and reinforced transverse ribs by marking, and ensure their verticality; S3. Based on the longitudinal baseline of the bottom plate, weld the web plate, tighten the web plates on both sides with the transverse diaphragm and the reinforcing transverse ribs, and focus on controlling the straightness of the web plate; S4. Position the top plate and assemble and weld it into a box body.

[0012] The invention discloses a method for manufacturing a steel box beam. The technical key points of the method are as follows: placing a welded box body on a horizontal frame and welding the splicing plates according to a positioning line.

[0013] The beneficial effects of the present invention are as follows: the steel box structure, steel box girder, movable modular steel box girder bridge and manufacturing method, the steel box girder is a closed box structure formed by welding a top plate, a bottom plate, a web plate, a diaphragm and a reinforcing transverse rib, and the steel box structure is combined to form a steel box girder, which includes the following advantages: 1. Strong adaptability: Modular steel box girder bridges can quickly adapt to changes in mine terrain and frequent changes in intersection locations, solving the problem that traditional bridge structures are difficult to adapt to.

[0014] 2. Timeliness and speed: The modular steel box girder bridge has the characteristics of rapid installation and disassembly, which greatly improves the construction speed of the bridge, shortens the construction period, reduces the impact on the production organization of the open-pit mine, and meets the demand for high efficiency of the open-pit mine production.

[0015] 3. Mobility: The steel box girder of the present invention has excellent mobility and can be quickly adjusted when the intersection position changes, and the impact on the main coal transportation trunk road is minimized during the relocation process.

[0016] 4. High load-bearing capacity: In view of the heavy load of vehicles passing through open-pit coal mines, the steel box girder structure box adopts a narrow box form to ensure the high load-bearing capacity of the bridge structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 Schematic diagram of the structure of the steel box girder section of this embodiment; Figure 2 Schematic diagram of the explosion of the steel box girder section of this embodiment; Figure 3 This is a schematic diagram of the upper structure of the steel box girder bridge in this embodiment; Figure 4 Schematic diagram of the cross section of the upper structure of the steel box girder bridge of this embodiment; Figure 5 It is an enlarged view of the transverse connection part A of the steel box girder section in this embodiment.

[0019] The serial numbers in the figure are explained as follows: 1-top plate, 11-U-type longitudinal stiffening rib, 2-bottom plate, 21-I-type longitudinal stiffening rib, 3-web plate, 31-joining plate, 32-support plate, 4-cross partition, 41-manhole, 5-reinforced cross rib, 51-first reinforcement plate, 52-second reinforcement plate, 6-connecting plate, 7-high-strength bolts. DETAILED DESCRIPTION

[0020] 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 Figure 1-Figure 5 The present invention is further described in detail with reference to the accompanying drawings and specific embodiments. Embodiment 1:

[0021] The steel box girder segment structure of this embodiment is as follows Figure 1-5 As shown, a closed box structure is formed by welding a top plate 1, a bottom plate 2 and two webs 3, and transverse partitions 4 and reinforcing transverse ribs 5 are arranged at intervals along the length direction of the webs 3 inside the box.

[0022] In this embodiment, the top plate 1 and the bottom plate 2 are drawn with positioning lines to ensure the assembly accuracy of the U-shaped longitudinal stiffening ribs 11, the I-shaped longitudinal stiffening ribs 21, the web 3, the transverse partition 4 and the reinforcing transverse ribs 5.

[0023] This embodiment uses two U-shaped longitudinal stiffening ribs 11 and two I-shaped longitudinal stiffening ribs 21, and the number of the U-shaped longitudinal stiffening ribs 11 and 21 can be customized according to specific engineering application conditions and structural performance requirements.

[0024] In this embodiment, a mounting groove for mounting a U-shaped longitudinal stiffening rib is provided on the top of the transverse partition 4, and a through hole for allowing an I-shaped longitudinal stiffening rib to pass through is provided on the bottom thereof. A manhole 41 for connecting two adjacent steel boxes is also provided on the transverse partition 4.

[0025] The top of the reinforcing transverse rib 5 of this embodiment is provided with an installation groove for installing the U-shaped stiffening rib, and a first reinforcing plate 51 is provided below the installation groove. The first reinforcing plate 51 is welded between the left and right webs 3, and a second reinforcing plate 52 is further provided below the first reinforcing plate 51 to reinforce the vertical plate of the reinforcing transverse rib 5. The second reinforcing plate 52 is welded on the vertical plate and is located inside the steel box.

[0026] In this embodiment, a plurality of splicing plates 31 are provided on the outer side of the web plate 3 , and two transversely adjacent steel box beam sections are connected via a connecting plate 6 using high-strength bolts 7 .

[0027] The web 3 of this embodiment is welded with a splicing plate 31 and a supporting plate 32 on the outside, and the splicing plate 31 is provided with bolt holes for connecting two steel box beam sections.

[0028] The manufacturing process of the steel box structure adopted in this embodiment mainly includes the following steps: S1. All steel box girder segments are cut, cut, straightened and punched in the factory according to the processing drawings; S2, placing the top plate 1 and the bottom plate 2 on the assembly welding jig, accurately aligning the longitudinal baselines of the U-shaped longitudinal stiffening ribs 11 and the I-shaped longitudinal stiffening ribs 21 with the positioning lines on the top plate 1 and the bottom plate 2, and welding them; S3, placing the welded bottom plate 2 on a horizontal tire frame, marking and assembling the transverse partition 4 and the reinforcing transverse rib 5 to ensure their verticality; S4. Based on the longitudinal baseline of the bottom plate 2, weld the web plate 3, tighten the web plates 3 on both sides with the transverse diaphragm 4 and the reinforcing transverse ribs 5, and focus on controlling the straightness of the web plate; S5, positioning the top plate 1, and assembling and welding the top plate 1 into a box body; The manufacturing process of the steel box girder adopted in this embodiment mainly includes the following steps: S6, placing the assembled and welded box body on a horizontal tire frame, welding the splicing plate 31 according to the positioning line, and painting after completion.

[0029] The installation and removal of the modular steel box girder bridge superstructure suitable for heavy-load traffic adopted in this embodiment mainly includes the following steps: S1. After the steel beam segment is processed and manufactured on site, the finished steel beam segment is transported to the construction site by car, and the steel beam segment is hoisted to the temporary support set up on site by crane. During the assembly operation, the multiple splicing plates 31 installed on the outer side of the steel box beam segment web 3 are used to fasten the two transversely adjacent steel box beam segments through the connecting plate 6 and high-strength bolts 7 to complete the on-site assembly of the steel beam; S2. When dismantling and moving, first disassemble the bridge superstructure and substructure, then disassemble the original whole span system into a modular unit system, use a truck crane as the equipment for dismantling the steel box girder section, and the transportation of the dismantled steel box girder section can be carried out by large open-pit mine equipment vehicles; S3. When the dismantled steel box girder section is transported to the new bridge installation site, the steel box girder section structure shall be inspected and repaired and can only be used after meeting the technical requirements for secondary use; S4. The abutments and foundation work should be completed in advance for the installation of the bridge in the new location. After the steel box girder section has passed the structural inspection after removal, it can be directly assembled using a truck crane to complete the relocation. Embodiment 2:

[0030] The steel box girder of this embodiment is formed by splicing a plurality of steel boxes through connecting plates 6 using high-strength bolts 7 . Embodiment 3:

[0031] A movable modular steel box girder bridge in this embodiment includes the steel box girder in Example 2.

[0032] 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 steel box structure, characterized in that: The invention comprises a closed box structure formed by welding a top plate (1), a bottom plate (2), a web plate (3), a transverse diaphragm (4) and a reinforcing transverse rib (5), wherein the transverse diaphragm (4) and the reinforcing transverse rib (5) are alternately arranged in the box along the longitudinal direction of the bridge, and U-shaped longitudinal reinforcing ribs (11) and I-shaped longitudinal reinforcing ribs (21) are respectively welded in the longitudinal direction of the top plate (1) and the bottom plate (2), and a plurality of splicing plates (6) are arranged on the outer side of the web plate (3), and two transversely adjacent steel box beam sections are connected via a connecting plate (6) using high-strength bolts (7).

2. The steel box structure as claimed in claim 1, characterized in that: The top of the transverse partition (4) is provided with a mounting groove for mounting a U-shaped longitudinal stiffening rib, and the bottom thereof is provided with a through hole for allowing the I-shaped longitudinal stiffening rib to pass through. The transverse partition (4) is also provided with a manhole (41) for connecting two adjacent steel boxes.

3. The steel box structure according to claim 1, characterized in that: A mounting groove for mounting a U-shaped stiffening rib is provided at the top of the reinforcing transverse rib (5), a first reinforcing plate (51) is provided below the mounting groove, the first reinforcing plate (51) is welded between the left and right web plates (3), and a second reinforcing plate (52) is provided below the first reinforcing plate (51) for reinforcing the vertical plate of the reinforcing transverse rib (5), the second reinforcing plate (52) is welded to the vertical plate and is located inside the steel box.

4. A steel box structure as claimed in claim 3, characterized in that: The web (3) is externally welded with a splicing plate (31) and a supporting plate (32), and the splicing plate (31) is provided with bolt holes for connecting two steel box beam sections.

5. A steel box girder, characterized in that: It is composed of the steel box structure described in claim 1.

6. A movable modular steel box girder bridge, characterized in that: Comprising the steel box girder as claimed in claim 5.

7. A method for manufacturing a steel box, characterized in that: The following steps are involved: S1. Place the top plate and the bottom plate on the assembly welding jig, accurately align the longitudinal baselines of the U-shaped longitudinal stiffening ribs and the I-shaped longitudinal stiffening ribs with the positioning lines on the top plate and the bottom plate, and then weld them; S2. Place the welded bottom plate on the horizontal frame, assemble the transverse partition and reinforced transverse ribs by marking, and ensure their verticality; S3. Based on the longitudinal baseline of the bottom plate, weld the web plate, tighten the web plates on both sides with the transverse diaphragm and the reinforcing transverse ribs, and focus on controlling the straightness of the web plate; S4. Position the top plate and assemble and weld it into a box body.

8. A method for manufacturing a steel box girder, characterized in that: Place the welded box on a horizontal frame and weld the joint plates according to the positioning lines.

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