Steel hollow sandwich plate concrete composite trough beam bridge and manufacturing method

Abstract

The present invention provides a steel-concrete composite trough beam bridge with hollow sandwich panels and a manufacturing method thereof, comprising a prefabricated steel hollow sandwich panel, with studs welded crisscrossingly on the top of the prefabricated steel hollow sandwich panel, a bridge deck cast on the top of the prefabricated steel hollow sandwich panel, and the studs placed in the bridge deck. Simultaneously, I-beams integrally connected to the bridge deck are cast on both sides of the bridge deck, thereby forming a steel-concrete composite trough beam bridge with a U-shaped cross section, comprising the prefabricated steel hollow sandwich panel, the bridge deck, and the I-beams. The present invention combines the prefabricated steel hollow sandwich panel with the I-beams on the left and right sides of the bridge deck to form a composite trough beam. The overall stiffness of the beam and the side longitudinal ribs is increased, the transverse grid space effect is more fully utilized, the stress level of the steel section and the concrete bridge deck is reduced, and the corresponding amount of steel used is reduced. The bridge has a high hollow ratio and high load-bearing efficiency, which can significantly reduce the weight of the base plate and the engineering workload.

Description

Technical Field

[0001] The invention relates to a steel hollow sandwich plate concrete composite trough beam bridge and a manufacturing method thereof, belonging to the technical field of hollow sandwich plate bridges and trough beams. Background Art

[0002] When hollow-web sandwich panels are used as unidirectionally loaded plate-girder bridges, the load level of the bridge is much higher than that of the building structure, resulting in a small plate-girder height-to-span ratio, less than L / 20 to L / 30. The advantages of a large beam height and a high hollow ratio are, however, excessive beam height and unidirectional loading require greater horizontal shear stiffness and vertical stiffness. To ensure the grid effect of the steel hollow-web sandwich panels, the longitudinal grid size generally needs to be controlled within 1.5m to 3.0m, which requires sufficient transverse upper (lower) ribs. However, the unidirectional loading and multiple support support result in the transverse spatial grid effect and bearing capacity not being fully utilized.

[0003] The trough beam is the upper structure of the bridge. The traditional longitudinal beam + whole plate system requires a thicker bottom plate, and the bottom plate engineering volume accounts for a large proportion of the overall structure, which increases the project cost. In addition, the trough beam structure exhibits weak torsional resistance, large lateral bending moment of the bridge deck, and the main beam bottom plate is in the tension zone.

[0004] SUMMARY OF THE INVENTION

[0005] In view of the deficiencies in the prior art, the present invention proposes a steel hollow sandwich plate concrete composite trough beam bridge and a manufacturing method thereof to overcome the deficiencies in the prior art.

[0006] The technical solution of the present invention is as follows: a steel hollow sandwich plate concrete composite trough beam bridge, comprising a prefabricated steel hollow sandwich plate, with bolts welded crisscrossly on the top of the prefabricated steel hollow sandwich plate, a bridge deck cast on the top of the prefabricated steel hollow sandwich plate, and the bolts placed in the bridge deck, and at the same time, I-beams connected to the bridge deck as a whole are cast on both sides of the bridge deck, so that the prefabricated steel hollow sandwich plate, the bridge deck and the I-beam form a steel-concrete composite trough beam bridge with a U-shaped cross section.

[0007] Furthermore, the prefabricated steel hollow sandwich panel includes square steel tube shear keys arranged in a matrix, and upper rib beams and lower rib beams are fixedly connected in parallel between adjacent square steel tube shear keys, forming upper chord layers and lower chord layers composed of grid units respectively; the top side walls and bottom side walls of the square steel tube shear keys are welded with covering plates connecting adjacent upper rib beams or adjacent lower rib beams; the bolts are welded to the upper rib beams.

[0008] Furthermore, the upper rib beam and the lower rib beam are made of T-shaped steel or H-shaped steel, a stiffening plate is welded between the upper rib beam and the lower rib beam, and the inner side of the stiffening plate is welded and fixed to the shear key.

[0009] Furthermore, sealing plates are welded to both ends of the square steel tube shear key.

[0010] Furthermore, the height-to-span ratio of the fabricated steel hollow sandwich panel is 1 / 20 to 1 / 30.

[0011] Furthermore, the mesh unit size of the fabricated steel hollow sandwich panel is 1.5 to 3.0 m, and the longitudinal mesh size L z With the horizontal grid size L x Ratio L z / L x =1.0~2.0.

[0012] At the same time, the present invention also provides a method for manufacturing the above-mentioned steel hollow sandwich plate concrete composite trough beam bridge, wherein the prefabricated steel hollow sandwich plate is first manufactured in the factory according to the prefabricated assembly units, and bolts are welded crisscrossly on the top of the prefabricated steel hollow sandwich plate. Then, the assembly units of the prefabricated steel hollow sandwich plate are transported to the construction site for assembly and connection. Thereafter, the prefabricated steel hollow sandwich plate is erected between the bridge supports, and then the bridge deck steel bars are tied on the top of the prefabricated steel hollow sandwich plate. Then, the bridge deck concrete is poured, and the bolts are placed in the bridge deck. At the same time, an I-beam connected to the bridge deck as a whole is cast on both sides of the bridge deck, so that the prefabricated steel hollow sandwich plate, the bridge deck and the I-beam form a steel-concrete composite trough beam bridge with a U-shaped cross section, so as to ensure that the bridge deck and the I-beam are in the compression zone, so as to give full play to the compressive bearing efficiency of the bridge deck and the tensile bearing efficiency of the prefabricated steel hollow sandwich plate.

[0013] Due to the adoption of the above technical solution, the advantages of the present invention are:

[0014] 1. The present invention solves the problem that existing hollow sandwich slab bridges need to increase the main beam stiffness when used for medium and large spans under unidirectional load. Since the load level of the bridge is much higher than that of the building structure, the height-to-span ratio of the slab to the beam is small, and its height-to-span ratio is lower than L / 20 to L / 30. The beam height is large, and the hollow ratio is high, which is its advantage. When the beam height is too large or under unidirectional load, it is necessary to increase the shear stiffness and vertical stiffness in the horizontal plane (to avoid large vertical and horizontal shear displacement). The present invention combines the assembled steel hollow sandwich slab with the I-beams on the left and right sides of the bridge deck to form a combined trough beam, which can improve the overall stiffness of the hollow sandwich slab bridge to a certain extent, thereby reducing the stress level of the upper (lower) ribs and the bridge deck. The height-to-span ratio of the steel hollow sandwich slab can be reduced to L / 20 to L / 30, which reduces the beam height to a certain extent and enhances the shear stiffness in the horizontal plane.

[0015] 2. Avoid stress concentration on the side longitudinal ribs: When the wheel load is concentrated on the side longitudinal ribs of the hollow sandwich panel, since the hollow sandwich panel is supported by multiple supports, a support is set at each end of each longitudinal rib, and the longitudinal and transverse hollow ratios are high, the transverse distribution of the wheel load is weaker than the longitudinal transmission, and the side longitudinal ribs share most of the wheel load, resulting in stress concentration on the side longitudinal ribs; the combined trough beam formed by the left and right side beams on the basis of the hollow sandwich panel is improved, the side longitudinal ribs and the overall stiffness are improved, thus avoiding stress concentration on the side longitudinal ribs and making the longitudinal and transverse stresses more uniform.

[0016] 3. Make the transverse grid space effect more fully utilized: In order to ensure the grid effect of the steel hollow sandwich panel, the longitudinal grid size needs to be controlled within 1.5m to 3.0m, so there must be enough transverse upper (lower) ribs. The transverse distribution is weaker than the longitudinal transmission, and the unidirectional force and multi-support support result in the transverse space grid effect and bearing capacity not being fully utilized. The present invention combines the left and right side beams to form a combined trough beam on the basis of the assembled steel hollow sandwich panel. The left and right sides are both arranged in the range of the side longitudinal rib beams to improve the stiffness of the side longitudinal rib beams. The transverse distribution from the mid-span to the vicinity of the support is equivalent to the longitudinal transmission, or even higher than the longitudinal transmission (when the bridge width is narrow and the left and right side beams of the trough beam have greater stiffness), and the transverse grid space effect is more fully utilized. Even if it is subjected to unidirectional force, the transverse grid bearing efficiency is greatly improved, and the material of the transverse upper (lower) ribs can be more fully utilized.

[0017] 4. Save construction costs: Due to the bidirectional hollowing of the belly of the slab, under the same span conditions, the self-weight of the structure is greatly reduced compared to other steel-concrete composite beam bridges, the amount of steel used is greatly reduced, and at the same time, it has a high load-bearing efficiency of about 80% to 90% in the longitudinal and transverse directions.

[0018] In summary, the present invention combines trough beams with prefabricated steel hollow sandwich panels. This improves overall and side longitudinal rib stiffness, maximizes the transverse grid spatial effect, reduces stress levels in the steel and concrete deck, and consequently reduces steel usage. The concrete content of the left and right I-beams only accounts for approximately 10% to 15% of the deck. Because the prefabricated steel hollow sandwich panel bridge utilizes a spatial grid system and its deck is supported on all four sides, the deck thickness can be reduced by 50% to 100% compared to other composite beam bridges. Compared to existing prefabricated steel hollow sandwich panel bridges, this design reduces steel usage and maximizes the performance of components. Compared to concrete trough beam bridges, it significantly reduces deadweight, reduces structural dimensions, and facilitates construction. This combination combines the advantages of steel hollow sandwich panels and trough beams, offering advantages such as low steel usage, prefabrication, and efficient construction. It meets the functional requirements of modern structures and offers significant technical, economic, and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 yes Figure 1 Cross-sectional view of

[0021] Figure 3 yes Figure 2 Schematic diagram of the locally enlarged structure of the node;

[0022] Figure 4 It is a schematic diagram of the partial structure of the assembled steel hollow sandwich panel.

[0023] Explanation of the accompanying symbols: 1-assembled steel hollow sandwich panel; 2-upper rib beam; 3-lower rib beam; 4-square steel tube shear key; 5-stiffener plate; 6-cladding plate; 7-bridge deck; 8-I-beam; 9-bolt. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0025] The schematic diagram of the steel hollow sandwich plate concrete composite trough beam bridge of the present invention is as follows Figures 1 to 3 As shown, it includes a prefabricated steel hollow sandwich panel 1, on the top of which bolts 9 are welded in a crisscross pattern, a bridge deck 7 is cast on the top of the prefabricated steel hollow sandwich panel 1, and the bolts 9 are placed in the bridge deck 7. At the same time, an I-beam 8 connected to the bridge deck 7 is cast on both sides of the bridge deck 7, so that the prefabricated steel hollow sandwich panel 1, the bridge deck 7 and the I-beam 8 form a steel-concrete composite trough beam bridge with a U-shaped cross section. The height-to-span ratio of the prefabricated steel hollow sandwich panel 1 is 1 / 20. The grid unit size of the prefabricated steel hollow sandwich panel 1 is 2m, and the longitudinal grid size L z With the horizontal grid size L x Ratio L z / L x =1.0

[0026] See also Figure 4 The fabricated steel hollow sandwich panel 1 includes square steel tube shear keys 4 arranged in a matrix, with upper rib beams 2 and lower rib beams 3 fixedly connected in parallel between adjacent square steel tube shear keys 4, forming an upper chord layer and a lower chord layer composed of grid units respectively; the top side wall and the bottom side wall of the square steel tube shear key 4 are welded with a covering plate 6 connecting the adjacent upper rib beams 2 or the adjacent lower rib beams 3; the bolts 9 are welded to the upper rib beam 2. The upper rib beam 2 and the lower rib beam 3 are made of T-shaped steel or H-shaped steel, and a stiffening plate 5 is welded between the upper rib beam 2 and the lower rib beam 3, and the inner side of the stiffening plate 5 is welded to the shear key 4. Closing plates are welded at both ends of the square steel tube shear key 4.

[0027] When manufacturing the above-mentioned steel hollow sandwich plate concrete composite trough beam bridge, first, the prefabricated steel hollow sandwich plate 1 is manufactured in the factory according to the prefabricated assembly unit, and the studs 9 are welded crisscrossly on the top of the prefabricated steel hollow sandwich plate 1. Then, the various assembly units of the prefabricated steel hollow sandwich plate 1 are transported to the construction site for assembly and connection. After that, the prefabricated steel hollow sandwich plate 1 is erected between the bridge supports, and the square steel tube shear key 4 of the prefabricated steel hollow sandwich plate 1 is placed at the support. At the same time, the size and thickness of the square steel tube shear key 4 at the support position are larger than those of other square steel tubes in the span. The shear key 4 is twice as large; the bridge deck 7 steel bars are tied to the top of the assembled steel hollow sandwich plate 1, and then the bridge deck 7 concrete is poured, and the bolts 9 are placed in the bridge deck 7. At the same time, an I-beam 8 connected to the bridge deck 7 is poured on both sides of the bridge deck 7, so that the assembled steel hollow sandwich plate 1, the bridge deck 7 and the I-beam 8 form a steel-concrete composite trough beam bridge with a U-shaped cross section, so as to ensure that the bridge deck 7 and the I-beam 8 are in the compression zone, and give full play to the compressive bearing efficiency of the bridge deck 7 and the tensile bearing efficiency of the assembled steel hollow sandwich plate 1.

[0028] The present invention forms a composite trough beam based on the assembled steel hollow sandwich panel 1 and the I-beam 8 on the left and right sides of the bridge deck 7. Due to the structural grid and hollowing, as well as the high load-bearing efficiency in the longitudinal bridge direction, the steel consumption of the structure is greatly reduced compared with the steel box beam and steel box composite beam under the same conditions. For example, the average steel consumption of the steel box beam with L=25m and simple support at both ends is 350kg / m 2 -400kg / m 2 , using the same span steel hollow sandwich plate concrete composite trough beam, the average steel consumption is 120kg / m 2 -130kg / m 2 , the amount of steel used decreased by 2.9 to 3.1 times.

[0029] The present invention combines the advantages of prefabricated steel hollow sandwich panels 1 and trough beams, employing them together with bridge decks 7 as the roadway slabs. This results in a high hollow ratio and load-bearing efficiency, significantly reducing the weight and engineering workload of the base slab. Specifically, within the normal height range of a steel hollow sandwich panel bridge, I-beams 8 of appropriate height are added to the left and right sides to form a composite trough beam. This ensures that both the bridge deck 7 and the I-beams 8 are in the compression zone, effectively maximizing the load-bearing efficiency of the bridge deck under compression and the steel under tension. This significantly improves the longitudinal stiffness of the composite beam, reduces stress levels in the upper and lower rib steel and concrete deck, reduces steel consumption, and maximizes the transverse spatial grid effect. The steel hollow sandwich panel-concrete composite trough beam is a bottom-supported structural system, which can reduce the height of the bridge structure. It also features high load-bearing efficiencies of approximately 80% to 90% in both longitudinal and transverse directions, a low weight, and a low building height. By integrating the advantages and functional effects of the prefabricated steel hollow sandwich plate and trough beam structure system, the "small and medium span (L=10m, L=13m, L=16m, L=20m, L=25m, L=30m, 35m) steel hollow sandwich plate concrete composite trough beam" is formed, which is the first of its kind in bridge engineering.

[0030] A reasonable structural system and an excellent mechanical model are important criteria for measuring the rationality of a bridge structure, and its steel consumption reduction is also an important indicator. For medium spans, the steel consumption of steel hollow sandwich plate concrete composite trough beams is absolutely superior to that of steel box beam bridges and steel box composite beam bridges. The additional concrete volume caused by the installation of I-beams 8 on the left and right sides only accounts for about 10% to 15% of the bridge deck. Since the prefabricated steel hollow sandwich plate bridge is a spatial grid system and its bridge deck is supported on all four sides, the thickness of its bridge deck can be reduced by 50% to 100% compared with other composite beam bridges.

Claims

1. A steel hollow sandwich plate concrete composite trough beam bridge, comprising an assembled steel hollow sandwich plate (1), characterized in that: Bolts (9) are welded in a crisscross pattern on the top of the assembled steel hollow sandwich panel (1), a bridge deck (7) is cast on the top of the assembled steel hollow sandwich panel (1), and the bolts (9) are placed in the bridge deck (7), and an I-beam (8) connected to the bridge deck (7) is cast on both sides of the bridge deck (7), thereby forming a steel-concrete composite trough beam with a U-shaped cross section by the assembled steel hollow sandwich panel (1), the bridge deck (7) and the I-beam (8). Bridge; the assembled steel hollow sandwich plate (1) comprises square steel tube shear keys (4) arranged in a matrix, upper rib beams (2) and lower rib beams (3) are fixedly connected in parallel between adjacent square steel tube shear keys (4), respectively forming an upper chord layer and a lower chord layer composed of grid units; the top side wall and the bottom side wall of the square steel tube shear key (4) are welded with a covering plate (6) connecting the adjacent upper rib beams (2) or the adjacent lower rib beams (3); the studs (9) are welded to the upper rib beam (2).

2. The steel hollow sandwich slab concrete composite trough beam bridge according to claim 1, characterized in that: The upper rib beam (2) and the lower rib beam (3) are made of T-shaped steel or H-shaped steel, a stiffening plate (5) is welded between the upper rib beam (2) and the lower rib beam (3), and the inner side of the stiffening plate (5) is welded and fixed to the shear key (4).

3. The steel hollow sandwich slab concrete composite trough beam bridge according to claim 1, characterized in that: Sealing plates are welded to both ends of the square steel tube shear key (4).

4. The steel hollow sandwich slab concrete composite trough beam bridge according to claim 1, characterized in that: The height-to-span ratio of the fabricated steel hollow sandwich plate (1) is 1 / 20 to 1 / 30.

5. The steel hollow sandwich slab concrete composite trough beam bridge according to claim 1, characterized in that: The mesh unit size of the assembled steel hollow sandwich panel (1) is 1.5 to 3.0 m, and the longitudinal mesh size L z With the horizontal grid size L x Ratio L z / L x =1.0~2.

0.

6. A method for manufacturing a steel hollow sandwich slab concrete composite trough beam bridge according to any one of claims 1 to 5, characterized in that: First, the assembled steel hollow sandwich panel (1) is manufactured in the factory according to the assembled assembly unit, and the bolts (9) are welded crisscross on the top of the assembled steel hollow sandwich panel (1). Then, each assembly unit of the assembled steel hollow sandwich panel (1) is transported to the construction site for assembly and connection. After that, the assembled steel hollow sandwich panel (1) is erected between the bridge supports, and then the bridge deck (7) steel bars are tied on the top of the assembled steel hollow sandwich panel (1), and then the bridge deck (7) concrete is poured, and the bolts are welded. The nails (9) are placed in the bridge deck (7), and at the same time, an I-beam (8) connected to the bridge deck (7) is cast on both sides of the bridge deck (7), so that the assembled steel hollow sandwich panel (1), the bridge deck (7) and the I-beam (8) form a steel-concrete composite trough beam bridge with a U-shaped cross section, so as to ensure that the bridge deck (7) and the I-beam (8) are both in the compression zone, and give full play to the compressive bearing efficiency of the bridge deck (7) and the tensile bearing efficiency of the assembled steel hollow sandwich panel (1).

Images