Bridge structure for bearing gravel aggregate transportation gallery

Abstract

A bridge structure for bearing a gravel aggregate transportation corridor relates to the technical field of bridge engineering and comprises two spans of box girders, and each span of box girder comprises a No.0 girder section, a No.1 girder section and a closure girder section. The zero beam section is located at the top of a pier column, the first beam section is anchored on the zero beam section through a pre-stressed anchor cable, the folding beam section is divided into two spans and arranged on the two sides of the first beam section, the lower portion of a pier is provided with a swivel system, a double-swivel structure is adopted, in the construction process, swivel folding is conducted after cast-in-place is conducted on the two sides of an existing railway line, and operation safety of the existing railway line in the construction period is guaranteed. A bottom plate of the folded box girder is in a plane shape, a top plate of the box girder is in a parabola shape, the whole box girder is in an upper-curved and lower-flat shape, and a gravel aggregate conveying machine is installed on the bottom plate in the box girder. Different from an arch bridge structure of a traditional bridge, the arch bridge structure is inverted up and down, the problem that a transportation corridor is arranged on a girder web is solved, safety risks caused by the fact that the transportation corridor is arranged on the top of the bridge are avoided, and operation cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of bridge engineering, and specifically to a bridge structure for carrying a sand and gravel aggregate transportation corridor, which is mainly used for the sand and gravel aggregate transportation corridor to cross roads, railways and other structures, and is constructed by a plane rotation method. Background Art

[0002] When building gravel mines, transport corridors for transporting gravel aggregates are often built. In long-distance transportation, corridor transportation has obvious advantages over traditional vehicle transportation. When transport corridors that stretch for dozens of kilometers cross important sensitive crossing points such as railways and national highways, rotating bridges are often used to cross sensitive points to ensure construction safety and progress.

[0003] The corridor crosses the Beijing-Kowloon Railway and the national highway, with a span of 310m. According to the conventional design plan, a continuous rigid frame prestressed concrete arch bridge is used to cross the railway and the national highway. The top of the bridge is designed as a horizontal plane, and the conveyor belt conveyor cannot be installed inside the bridge. The conventional practice is to set the conveyor belt conveyor on the top of the bridge after the bridge construction is completed. In this plan, the concrete prestressed arch bridge itself plus the conveyor belt conveyor corridor has a cross-sectional height of about 15m, which is subject to huge wind loads and has great safety risks. Once the bulk materials (machine-made sand and gravel) transported by the conveyor belt conveyor are scattered, it will endanger the safety of railway transportation, and the project investment is relatively large.

[0004] In this regard, this application document proposes a bridge structure that supports a sand and gravel aggregate transportation corridor, aiming to solve the above-mentioned problems. Summary of the invention

[0005] This application proposes a bridge structure for carrying a sand and gravel aggregate transportation corridor, which ensures the safe operation of the existing line during construction, solves the problem of installing the transportation corridor on the web of the beam, avoids the safety risks brought by setting up the transportation corridor on the top of the bridge, and reduces the operating costs.

[0006] A bridge structure for carrying a sand and gravel aggregate transport corridor, used for carrying a conveyor belt conveyor that needs to cross a railway and a national highway, characterized by comprising: It comprises two spans of box girders, each span of the box girder comprises a No. 0 beam section, a No. 1 beam section, and a folded beam section, each beam section comprises a box girder top plate, a box girder web plate, and a box girder bottom plate, and a sand and gravel aggregate conveying belt conveyor is arranged on the inner bottom plate of the box girder; The box girder is characterized in that: each span of the box girder includes a No. 0 beam section, and the No. 0 beam section is divided into a straight beam section and a curved beam section, the straight beam section is located at the top of the pier column, the box girder top plate and the box girder bottom plate of the straight beam section are both planar, and the sides of the box girder top plate and the box girder bottom plate are symmetrically provided with equal-height box girder webs; the curved beam section is located on both sides of the straight beam section, and the curved beam section is a variable-height transition section, the box girder top plate is parabolic, the box girder bottom plate is planar, and the sides of the box girder top plate and the box girder bottom plate are symmetrically provided with variable-height box girder webs; No. 1 beam section, which has two sections and is located on both sides of the No. 0 beam section, is a height-changing transition section. The top plate of the box beam is in a parabolic shape, and the bottom plate of the box beam is in a flat shape, presenting an overall "upper curved and lower flat" shape. The sides of the box beam top plate and the box beam bottom plate are symmetrically provided with height-changing box beam webs; A closed beam section, wherein the box beam top plate and the box beam bottom plate of the closed beam section are both planar, and the sides of the box beam top plate and the box beam bottom plate are symmetrically provided with box beam webs of equal height; Furthermore, the No. 0 beam section is connected to the swivel pier, the extension direction of the swivel pier is perpendicular to the extension direction of the box beam, a swivel system for bridge rotation is arranged at the lower part of the swivel pier, and a bridge side pier is arranged below the folded beam section; Furthermore, the No. 1 beam section is located on both sides of the No. 0 beam section, one side of the No. 1 beam section is connected to the No. 0 beam section, and the other side is connected to the closed beam section; the height of the No. 1 beam section gradually decreases from the No. 0 beam section to the closed beam section, and the height of the No. 1 beam section close to the No. 0 beam section is the same as the height of the No. 0 beam section, and the height of the No. 1 beam section close to the closed beam section is the same as the height of the closed beam section; The closure beam section is connected to an existing transport corridor or to another span box beam; The web plate extends upward in a direction perpendicular to the top plate to form a protective wall; Furthermore, the top plate and bottom plate of the box beam of the beam section No. 1 are provided with a plurality of tooth blocks; the web plate of the box beam is provided with ventilation holes; The box girder top plate is provided with a plurality of drainage holes, the drainage holes are connected to the longitudinal water collecting pipes, and the longitudinal water collecting pipes are connected to the vertical drainage pipes; The box girder adopts a "double rotation" structure, the lower part of the two-span box girder is connected to the rotation system, and the cantilever structure is cast in situ parallel to the railway and the national highway on both sides, and then the rotation is closed during the window period, and then the railway and the national highway are crossed after the closure; After the box girder is rotated and closed, the bottom plate of the box girder is connected flatly, the top plate of the box girder is bent, and a sand and gravel aggregate conveying belt conveyor is installed on the inner bottom plate of the box girder.

[0007] This application has the following beneficial effects: The bridge structure formed after the box girder and the swivel of each span are closed has the characteristics of "curved on top and flat on the bottom", that is, the top plate of the bridge is curved and the bottom plate of the bridge is flat. The conveyor belt conveyor can be arranged on the bottom plate of the bridge, and there is no need to arrange the conveyor belt conveyor on the top of the bridge. The additional closed structure reduces the construction process, shortens the construction period, reduces the cross-section height, and ensures the safety of the structure. In order to reduce the impact on the operation of railways and national highways during the bridge construction process, the "swivel bridge" structure design is adopted. During the bridge construction, the prestressed "cantilever structure" is first constructed in the direction parallel to the railway in a safe area outside the railway. A rotatable "ball joint" structure is set at the bottom of the swivel pier. Before closing, the railway operation "window period" is selected to implement the rotation and closing. The bridge construction process is completed on the side of the existing line, and the conveyor belt conveyor installation process is completed in the closed structure, which ensures the safety of construction. In addition, the fully enclosed corridor structure can prevent the scattering of materials from threatening the safety of the railway and national highway below, ensuring the safety of operation and reducing the operation cost. The top web of the bridge extends upward to form a safety protective wall, and a drainage structure is designed to carry out regular drainage to prevent rainwater from endangering the railway contact network. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0009] Figure 1 This is a schematic diagram of the bridge structure of the present invention; Figure 2 It is a schematic diagram of the longitudinal section of the bridge structure of the present invention; Figure 3 This is a schematic diagram of the structure of beam section No. 0 of the present invention; Figure 4 It is a structural schematic diagram of beam section No. 1 and the folded beam section of the present invention; Figure 5 It is a cross-sectional schematic diagram of a folded beam section of the present invention; Figure 6 This is a schematic diagram of the bridge rotation and crossing line of the present invention; Figure 7 Schematic diagram of traditional bridge structure and transport corridor installation.

[0010] In the figure: 1. Beam section No. 0; 2. Beam section No. 1; 3. Closed beam section; 4. Box beam top plate; 5. Box beam web plate; 6. Box beam bottom plate; 7. Ventilation hole; 8. T2 rotation pier; 9. T3 rotation pier; 10. Rotation system; 11. Bridge side pier; 12. Protective wall; 13. Longitudinal water collecting pipe; 14. Vertical drainage pipe. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0012] The embodiments of the present application provide a bridge structure for carrying a sand and gravel aggregate transportation corridor, which can solve the problems of high construction and maintenance costs and high operation risks caused by the transportation corridor not being able to be installed inside the bridge structure and being installed on the upper part of the bridge structure.

[0013] The bridge structure of the present embodiment that supports the sand and gravel aggregate transportation corridor includes two spans of box girders, each span of which includes a No. 0 beam section 1, a No. 1 beam section 2, and a folded beam section 3. Each beam section includes a box girder top plate 4, a box girder web plate 5, and a box girder bottom plate 6.

[0014] Beam section No. 0 1 is divided into a straight beam section and a curved beam section. The straight beam section is located at the top of the pier column. The box girder top plate 4 and the box girder bottom plate 6 of the straight beam section are both planar. The sides of the box girder top plate 4 and the box girder bottom plate 6 are symmetrically provided with equal-height box girder webs 5; the curved beam section is located on both sides of the straight beam section. The curved beam section is a variable-height transition section. The box girder top plate 4 is parabolic, and the box girder bottom plate 6 is planar. The sides of the box girder top plate 4 and the box girder bottom plate 6 are symmetrically provided with variable-height box girder webs 5; the lower part of beam section No. 0 1 is connected to the swivel pier. A swivel system 10 is provided at the lower part of the swivel pier for bridge swivel construction.

[0015] There are two sections of beam section No. 1 2, which are located on both sides of beam section No. 0 1 and are variable height transition sections. The box beam top plate 4 is parabolic, and the box beam bottom plate 6 is planar, presenting an overall "upward curved and downward flat" shape. The variable height box beam webs 5 are symmetrically arranged on the sides of the box beam top plate 4 and the box beam bottom plate 6; the two sections of beam section No. 1 2 are respectively located on both sides of beam section No. 0 1, one side of beam section No. 1 2 is connected to beam section No. 0 1, and the other side is connected to the closed beam section 3; and the height of beam section No. 1 2 close to one end of beam section No. 0 1 is the same as the height of beam section 0 1, and the height of beam section No. 1 2 close to the closed beam section 3 is the same as the height of the closed beam section 3.

[0016] The closing beam section 3, the box beam top plate 4 and the box beam bottom plate 6 of the closing beam section 3 are both planar, and the box beam top plate 4 and the box beam bottom plate 6 are symmetrically arranged on the sides of the equal height box beam web plates 5; the closing beam section 3 is used to connect the box beam section 1 2 with the existing transport corridor or another span of the box beam.

[0017] Furthermore, the top plate 4 of the box girder of beam section No. 1 2 is provided with tooth blocks, and the bottom plate 6 of the box girder is provided with tooth blocks for tensioning and anchoring prestressed cables, thereby enhancing the bearing capacity and seismic resistance of the box girder through the effect of prestress.

[0018] Furthermore, the box girder web 5 is provided with ventilation holes 7 for structural ventilation and exhaust, balancing the temperature changes inside and outside the structure, reducing the temperature difference between the inside and outside of the concrete box girder, and improving the safety of the structure.

[0019] Furthermore, the web extends upward in a direction perpendicular to the top plate to form a protective wall 12, which can be used for safety protection.

[0020] Furthermore, a plurality of drainage holes are arranged on the box girder top plate 4, which are connected to the longitudinal water collecting pipe 13, and the longitudinal water collecting pipe 13 is connected to the vertical drainage pipe 14, so as to guide the accumulated water on the top plate to the nearby drainage holes to prevent the accumulated water from flowing to the railway and endangering the safe operation of the railway contact network.

[0021] The two-span box girder adopts a "double rotation" design, and the lower part is connected to the rotation pier. The lower part of the rotation pier is provided with a rotation system 10 for the box girder rotation construction. During construction, the two-span box girder is cast in place parallel to the railway and the national highway, and then rotated and closed. After closing, it crosses the railway and the national highway with a span of 310m. The use of a rotation bridge construction can avoid the national highway and the Beijing-Kowloon Railway below, avoiding affecting the safety of the national highway and the railway operation.

[0022] After the box girder is rotated and closed, the box girder bottom plate 6 is connected flat, and the box girder top plate 4 is bent. The aggregate sand and gravel conveyor installed on the bridge top plate in the traditional structure is installed inside the bridge. The sand and gravel aggregate transportation efficiency of the conveyor belt conveyor is 13,000 t / h, and the sand and gravel conveyor is completely in a closed environment, which avoids the situation where the structural components of the transport corridor fall off or the sand and gravel aggregate scatter during operation, affecting the safety of the existing line below.

[0023] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A bridge structure for carrying a sand and gravel aggregate transport corridor, used to carry a conveyor belt conveyor that needs to cross a railway and a national highway, characterized in that: It comprises two spans of box girders, each span of the box girder comprises a No. 0 beam section (1), a No. 1 beam section (2), and a closed beam section (3), each beam section comprises a box girder top plate (4), a box girder web plate (5), and a box girder bottom plate (6), and a sand and gravel aggregate conveying belt conveyor is arranged on the inner bottom plate of the box girder; The box girder is characterized in that: each span of the box girder comprises a No. 0 beam section (1), the No. 0 beam section (1) is divided into a straight beam section and a curved beam section, the straight beam section is located at the top of the bridge pier column, the box girder top plate (4) and the box girder bottom plate (6) of the straight beam section are both planar, and the box girder top plate (4) and the box girder bottom plate (6) are symmetrically arranged with equal-height box girder webs (5) on the sides; the curved beam section is located on both sides of the straight beam section, the curved beam section is a variable-height transition section, the box girder top plate (4) is parabolic, the box girder bottom plate (6) is planar, and the variable-height box girder webs (5) are symmetrically arranged with the sides of the box girder top plate (4) and the box girder bottom plate (6); No. 1 beam sections (2), which are two in number and are located on both sides of the No. 0 beam section (1), and are transition sections with variable heights. The box beam top plate (4) is in a parabolic shape, and the box beam bottom plate (6) is in a planar shape, presenting an overall "upper curved and lower flat" shape. Variable height box beam web plates (5) are symmetrically arranged on the sides of the box beam top plate (4) and the box beam bottom plate (6); A closed beam section (3), wherein the box beam top plate (4) and the box beam bottom plate (6) of the closed beam section (3) are both planar, and box beam web plates (5) of equal height are symmetrically arranged on the sides of the box beam top plate (4) and the box beam bottom plate (6).

2. A bridge structure for carrying a sand and gravel aggregate transportation corridor as claimed in claim 1, characterized in that: The No. 0 beam section (1) is connected to a swivel pier, the swivel pier extends in a direction perpendicular to the box beam, a swivel system (10) for bridge swivel is provided at the bottom of the swivel pier, and a bridge side pier (11) is provided below the folded beam section (3); The No. 1 beam section (2) is located on both sides of the No. 0 beam section (1), one side of the No. 1 beam section (2) is connected to the No. 0 beam section (1), and the other side is connected to the closed beam section (3); the height of the No. 1 beam section (2) gradually decreases from the No. 0 beam section (1) to the closed beam section (3), and the height of the No. 1 beam section (2) on the side close to the No. 0 beam section (1) is the same as the height of the No. 0 beam section (1), and the height of the No. 1 beam section (2) on the side close to the closed beam section (3) is the same as the height of the closed beam section (3); The closure beam section (3) is connected to an existing transport corridor or to another span box beam; The web plate extends upward in a direction perpendicular to the top plate to form a protective wall (12).

3. A bridge structure for carrying a sand and gravel aggregate transportation corridor as claimed in claim 1, characterized in that: The box girder top plate (4) and the box girder bottom plate (6) of the No. 1 beam section (2) are provided with a plurality of tooth blocks; and the box girder web plate (5) is provided with ventilation holes (7).

4. A bridge structure for carrying a sand and gravel aggregate transportation corridor as claimed in claim 1, characterized in that: The box beam top plate (4) is provided with a plurality of drainage holes, the drainage holes being connected to a longitudinal water collecting pipe (13), and the longitudinal water collecting pipe (13) is connected to a vertical drainage pipe (14).

5. The bridge structure for carrying a sand and gravel aggregate transportation corridor according to claim 1, characterized in that: The bridge adopts a "double rotation" structure. The lower part of the two-span box girders is connected to the rotation system (10). The cantilever structure is cast in situ on both sides parallel to the railway and the national highway. The rotation is then closed during a window period. After the closure, the bridge crosses the railway and the national highway.

6. The bridge structure for carrying a sand and gravel aggregate transportation corridor according to claim 1, characterized in that: After the box girder is rotated and closed, the box girder bottom plate (6) is connected flat, the box girder top plate (4) is bent, and a sand and gravel aggregate conveying belt conveyor is installed on the inner bottom plate of the box girder.

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