A steel pipe - steel box composite truss capping beam

Abstract

The present invention discloses a steel pipe - steel box composite truss - type capping beam, which comprises a steel box and a truss. The bottom surface of the steel box is connected to columns, and the columns include a left column and a right column, and the columns are concrete - filled steel pipe members; the truss is respectively connected to the steel box and the columns. The truss includes a lower chord and diagonal web members. The lower chord is connected between adjacent left and right columns, and the diagonal web members are respectively connected between the columns and the steel box and between the lower chord and the steel box. The truss is a steel pipe member; there are several compartments in the steel box, and concrete is filled in all the compartments at the joints of the columns and the steel box and at the joints of the truss and the steel box. It can effectively reduce the self - weight, reduce the installation difficulty, eliminate the need for separately setting up formwork, save construction costs, reduce construction safety risks, significantly shorten the construction period, and remarkably improve the seismic performance.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and particularly relates to a steel pipe-steel box composite truss capping beam. Background Art

[0002] Double-column piers or double-column columns are commonly used lower structures at home and abroad, and are widely used in the simply supported structure main beam system. The support of the main beam mainly relies on the capping beam on the column piers or columns, and the reinforced concrete capping beam is the most common capping beam form. Although it is widely used in engineering, the existing reinforced concrete capping beam has a large self-weight. During construction, temporary supports need to be erected, formworks need to be erected, prestress needs to be tensioned, etc. The cumbersome construction process makes it have defects such as long construction period, high difficulty, high support cost, high safety risk of high-altitude operations, and difficult concrete curing. Especially, the steel bars, prestressed steel bars, and stirrups on the capping beam are criss-crossed, and the problem of concrete cracking is still inevitable. In addition, the creep of concrete increases after prestress tensioning, seriously affecting the durability of the structure and significantly affecting the safety of the bridge structure.

[0003] Therefore, it is very urgent for the design and construction of bridge engineering to propose a new type of capping beam with light weight, convenient erection, no formwork, simple construction process, low construction risk, and low construction cost. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above deficiencies of the existing capping beam, such as large self-weight, complex construction process, high construction cost, and high structural safety risk, and provide a steel pipe-steel box composite truss capping beam.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A steel pipe-steel box composite truss capping beam, comprising a steel box and a truss. The bottom surface of the steel box is connected to a column, and the column comprises a left column and a right column, and the column is a concrete-filled steel tube member; the truss is respectively connected to the steel box and the column. The truss comprises a lower chord and diagonal web members. The lower chord is connected between the adjacent left column and right column, and the diagonal web members are respectively connected between the column and the steel box and between the lower chord and the steel box. The truss is a steel tube member; there are several compartments in the steel box, and all the compartments at the joints of the column and the steel box and at the joints of the truss and the steel box are filled with concrete.

[0007] Adopting a steel pipe - steel box composite truss - type capping beam described in the present invention, which forms a capping beam by combining a steel box and a truss. Compared with a solid reinforced concrete capping beam, it effectively reduces the self - weight, reduces the installation difficulty. The concrete pouring part is only located in some partition bins and steel pipes, without the need to set up formwork separately, effectively saving costs and shortening the construction period. And the columns adopt a form of concrete - filled steel pipe members that matches the steel pipe truss structure, which is convenient for pre - fabrication in the factory, and is beneficial to reducing the natural vibration frequency, improving the structural ductility at the connection of the capping beam, and further enhancing the seismic performance of the structure. Pouring concrete in the partition bins at the connection nodes of the steel box is beneficial to reducing the fatigue stress amplitude. Adopting this structure effectively reduces the self - weight, reduces the installation difficulty, has a high degree of pre - assembly, now has less welding work, fewer pouring parts, no need for formwork, saves construction costs, reduces the safety risks during the construction stage, significantly shortens the construction period, and significantly enhances the seismic performance, providing a capping beam selection with lower cost and reliable performance for the bridge engineering design in high - intensity seismic regions.

[0008] Preferably, the left column includes a first left column on the outside and a second left column on the inside, the right column includes a first right column on the outside and a second right column on the inside, and the lower chord is connected between the adjacent second left column and second right column.

[0009] Further preferably, the truss further includes extension rods. An extension rod is connected between the first left column and the second left column, and an extension rod is also connected between the first right column and the second right column. The extension rods are all aligned with the lower chord, and the diameters of the extension rods are all the same as the diameter of the lower chord.

[0010] Further preferably, a number of first web pipes are spaced below each extension rod. All the first web pipes are steel pipe members, and the cross - sectional dimensions of all the first web pipes are the same and smaller than the cross - sectional dimension of the lower chord.

[0011] Further preferably, a number of second web pipes are spaced between two adjacent first left columns, a number of second web pipes are spaced between two adjacent second left columns, a number of second web pipes are spaced between two adjacent first right columns, and a number of second web pipes are spaced between two adjacent second right columns. All the second web pipes are steel pipe members, and the cross - sectional dimensions of all the second web pipes are the same and smaller than the cross - sectional dimension of the lower chord.

[0012] Preferably, the top end of the column extends into the corresponding partition bin.

[0013] Preferably, a stiffening plate one is connected to the end of the column connecting the steel box, and a stiffening plate one is connected to the end of the diagonal web member connecting the steel box.

[0014] Preferably, a plurality of connecting pipes are connected between the two lower chords, and the diameters of all the connecting pipes are the same and smaller than the diameter of the lower chord.

[0015] Preferably, a second stiffening plate is provided in the bin provided with the concrete, and the second stiffening plate is provided with through holes.

[0016] Preferably, the steel box comprises a symmetric left steel box section and a right steel box section, and the left steel box section and the right steel box section are welded and connected; the truss comprises a symmetric left truss section and a right truss section, and the left truss section and the right truss section are welded and connected; the column comprises an upper column section and a lower column section, and the upper column section and the lower column section are welded and connected, and the connection part of the upper column section and the lower column section is located below the truss.

[0017] That is, the steel box, the truss and the column all adopt a splicing structure, which is convenient for processing and transportation, and are welded and connected into a whole on site.

[0018] In summary, compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. By adopting the steel pipe-steel box composite truss type capping beam of the present invention, the self-weight is effectively reduced, the installation difficulty is reduced, the degree of prefabrication is high, the current welding workload is small, the casting part is few, no formwork is required, the construction cost is saved, the safety risk in the construction stage is reduced, the construction period is greatly shortened, and the seismic performance is significantly improved, providing a capping beam type with low cost and reliable performance for the bridge engineering design in high-intensity earthquake areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a structural schematic diagram of a steel pipe-steel box composite truss type capping beam of the present invention;

[0021] Figure 2 is Figure 1 the left structural view;

[0022] Figure 3 is a partial cross-sectional view of the steel box.

[0023] Markings in the figure: 1-steel box, 11-concrete, 211-first left column, 212-second left column, 221-first right column, 222-second right column, 3-lower chord, 31-connecting pipe, 4-inclined web member, 5-extension rod, 61-first abdominal pipe, 62-second abdominal pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments, and all technologies implemented based on the content of the present invention belong to the scope of the present invention.

[0025] Example 1

[0026] As Figures 1 - 3 shown, a steel pipe - steel box composite truss - type capping beam according to the present invention includes a steel box 1 and a truss. The bottom surface of the steel box 1 is connected to a column, and the truss is respectively connected to the steel box 1 and the column.

[0027] The column includes a left column and a right column. The column is a concrete - filled steel tube member. The left column includes two first left columns 211 on the outer side and two second left columns 212 on the inner side. The right column includes two first right columns 221 on the outer side and two second right columns 222 on the inner side.

[0028] The truss includes a lower chord 3, diagonal web members 4 and extension rods 5. The lower chord 3, diagonal web members 4 and extension rods 5 are all circular steel tube members. The lower chord 3 is connected between the adjacent second left column 212 and second right column 222 on the same side. Preferably, a plurality of connecting pipes 31 are connected between the two lower chords 3. The diameters of all the connecting pipes 31 are the same and smaller than the diameter of the lower chord 3. The extension rod 5 is connected at a position flush with the lower chord 3 between the first left column 211 and the second left column 212. The extension rod 5 is also connected at a position flush with the lower chord 3 between the first right column 221 and the second right column 222. And the diameters of the extension rods 5 are the same as the diameter of the lower chord 3. The extension rods 5 are coaxial with the corresponding lower chords 3. A plurality of first web pipes 61 are arranged at intervals below each extension rod 5, that is, the first web pipes 61 are connected between the first left column 211 and the second left column 212 and between the first right column 221 and the second right column 222. All the first web pipes 61 are circular steel tube members. The diameters of all the first web pipes 61 are the same and smaller than the diameter of the lower chord 3. A plurality of second web pipes 62 are arranged at intervals between two adjacent first left columns 211, between two adjacent second left columns 212, between two adjacent first right columns 221, and between two adjacent second right columns 222. All the second web pipes 62 are circular steel tube members. The diameters of all the second web pipes 62 are the same and smaller than the diameter of the lower chord 3. The diagonal web members 4 are respectively connected between the column and the steel box 1 and between the lower chord 3 and the steel box 1. The truss is not connected to the column and the steel box 1, and generally no concrete needs to be poured therein.

[0029] The steel box 1 has several compartments, and all the compartments located at the joints of the columns and the steel box 1 and at the joints of the trusses and the steel box 1 are filled with concrete 11. The tops of the first left column 211, the second left column 212, the first right column 221, and the second right column 222 all extend into the corresponding compartments. One end of the column connected to the steel box 1 is connected with a first stiffening plate. One end of the diagonal web member 4 connected to the steel box 1 is connected with a first stiffening plate. Preferably, as Figure 3 shown, a second stiffening plate is provided in the compartment provided with the concrete 11, and the second stiffening plate has through holes to facilitate the circulation of the poured concrete.

[0030] For a steel pipe-steel box composite truss type capping beam described in the present invention, the capping beam is formed by combining the steel box 1 and the truss. Compared with a solid reinforced concrete capping beam, the self-weight is effectively reduced, and the installation difficulty is reduced. The concrete pouring part is only located in some compartments and steel pipes, and there is no need to erect a formwork separately, effectively saving costs and shortening the construction period. Moreover, the columns adopt a form of concrete-filled steel pipe members that matches the steel pipe truss structure, which is convenient for prefabrication in the factory, and is beneficial to reducing the self-vibration frequency and improving the structural ductility at the connection of the capping beam, thereby enhancing the seismic performance of the structure. Pouring concrete in the compartments at the connection nodes of the steel box 1 is beneficial to reducing the fatigue stress amplitude. Using this structure effectively reduces the self-weight, reduces the installation difficulty, has a high degree of prefabrication, now has a small amount of welding work, few pouring parts, no formwork, saves construction costs, reduces the safety risks during the construction stage, significantly shortens the construction period, and significantly improves the seismic performance, providing a capping beam type with lower cost and reliable performance for the bridge engineering design in high-intensity earthquake areas.

[0031] Preferably, the steel box 1 includes a symmetric left steel box section and a right steel box section. As Figure 1 shown, the dotted part of the steel box 1 in the figure divides the steel box 1 into a left steel box section and a right steel box section, and the left steel box section and the right steel box section are welded together; the truss includes a symmetric left truss section and a right truss section, and the left truss section and the right truss section are welded together. As Figure 1 shown, the dotted part of the lower chord member 3 in the figure is symmetrically divided into a left truss section and a right truss section; the column includes an upper column section and a lower column section. If Figure 1 and 2 shown, the dotted parts of the first left column 211, the second left column 212, the first right column 221, and the second right column 222 in the figure are divided. The upper column section and the lower column section are welded together, and the connection part of the upper column section and the lower column section is located below the truss, that is, the steel box 1, the truss, and the column all adopt a splicing structure, which is convenient for processing and transportation, and only a small amount of welding work needs to be carried out on site to connect them into a whole.

[0032] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A steel pipe - steel box composite truss capping beam, characterized in that It includes a steel box (1) and a truss. The bottom surface of the steel box (1) is connected to columns, and the columns include a left column and a right column, and the columns are concrete-filled steel tube members; the truss is respectively connected to the steel box (1) and the columns. The truss includes a lower chord (3) and diagonal web members (4). The lower chord (3) is connected between adjacent left and right columns. The diagonal web members (4) are respectively connected between the columns and the steel box (1) and between the lower chord (3) and the steel box (1). The truss is a steel tube member; there are several compartments in the steel box (1), and concrete (11) is filled in all the compartments at the joints of the columns and the steel box (1) and at the joints of the truss and the steel box (1). The top ends of the columns extend into the corresponding compartments. The left column includes a first left column (211) on the outside and a second left column (212) on the inside. The right column includes a first right column (221) on the outside and a second right column (222) on the inside. The lower chord (3) is connected between adjacent second left columns (212) and second right columns (222), and several connecting pipes (31) are connected between the two lower chords (3).

2. The capping beam according to claim 1, characterized in that, The truss further includes extension rods (5). The extension rods (5) are connected between the first left column (211) and the second left column (212), and the extension rods (5) are also connected between the first right column (221) and the second right column (222). The extension rods (5) are all aligned with the lower chord (3), and the diameters of the extension rods (5) are all the same as the diameter of the lower chord (3).

3. The capping beam according to claim 2, wherein, Several first web pipes (61) are arranged at intervals below each extension rod (5). All the first web pipes (61) are steel tube members, and the cross-sectional dimensions of all the first web pipes (61) are the same and smaller than the cross-sectional dimension of the lower chord (3).

4. The capping beam according to claim 1, wherein, Several second web pipes (62) are arranged at intervals between adjacent first left columns (211), several second web pipes (62) are arranged at intervals between adjacent second left columns (212), several second web pipes (62) are arranged at intervals between adjacent first right columns (221), and several second web pipes (62) are arranged at intervals between adjacent second right columns (222). All the second web pipes (62) are steel tube members, and the cross-sectional dimensions of all the second web pipes (62) are the same and smaller than the cross-sectional dimension of the lower chord (3).

5. The capping beam according to any one of claims 1-4, characterized in that, A first stiffening plate is connected to the end of the column where it is connected to the steel box (1), and a first stiffening plate is connected to the end of the diagonal web member (4) where it is connected to the steel box (1).

6. The capping beam according to any one of claims 1-4, characterized in that, The diameters of all the connecting pipes (31) are the same and smaller than the diameter of the lower chord (3).

7. The capping beam according to any one of claims 1-4, characterized in that, A second stiffening plate is provided in the compartment filled with the concrete (11), and the second stiffening plate has through holes.

8. The capping beam according to any one of claims 1-4, characterized in that, The steel box (1) includes a symmetric left steel box section and a right steel box section, and the left steel box section and the right steel box section are welded together; the truss includes a symmetric left truss section and a right truss section, and the left truss section and the right truss section are welded together; the column includes an upper column section and a lower column section, and the upper column section and the lower column section are welded together, and the connection between the upper column section and the lower column section is located below the truss.

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