AU2021105107A4 - Steel-Concrete Composite Bridge Deck Structure and Bridge - Google Patents

Abstract

Disclosed are a steel-concrete composite bridge deck structure and bridge, comprising: an ultra-high performance concrete slab; a cross beam, which is arranged along transverse direction of bridge and is located below the ultra-high performance concrete slab, and the cross beam is connected to 5 the ultra-high performance concrete slab by means of shear studs; and a steel rib, which is arranged along longitudinal direction of bridge, and the steel rib passes through the cross beam and is cross-fixed with the cross beam, and at the same time, the steel rib partially enters the ultra-high performance concrete slab. In the steel-concrete composite bridge deck structure and 10 bridge of the present invention, the cross beam and the steel rib may enhance overall tensile stiffness and flexural stiffness of the steel-concrete composite bridge deck structure, and when ultra-high performance concrete materials are adopted, the thickness of the concrete slab may be designed to be thinner, thereby reducing the overall weight of the steel-concrete composite bridge is deck structure. Therefore, the overall stiffness of the steel-concrete composite bridge deck structure can be improved, and the overall strength, durability and safety of the bridge can also be improved at the same time. 1/7 A-\ LO LO LO A CN CN CN C-4 CN CN Fig. I

Description

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Specification

Steel-Concrete Composite Bridge Deck Structure and Bridge

Field of the Invention The present invention relates to the technical field of bridges, in particular to a steel-concrete composite bridge deck structure and bridge.

Background of the Invention At present, steel-concrete composite bridges are widely used in urban overpass bridges and building structures in our country, and are one of the main development directions in the future structural systems. In related technologies, the steel-concrete composite beam adopts thicker concrete bridge decks, which have the advantages of high stiffness, less welding workload and less fatigue disease of bridge decks, and the pavement layer thereof generally has a longer service life than the steel beam. However, due to large self-weight of the steel-concrete composite beam and is low tensile strength of the concrete, the concrete bridge deck in the negative bending moment area of the composite beam is easy to crack, which poses a threat to the stiffness, durability and safety of the main girder. Therefore, it is necessary to design a new steel-concrete composite bridge deck structure and bridge to overcome the problems mentioned above.

Summary of the Invention

The embodiment of the present invention provides a steel-concrete composite bridge deck structure and bridge, aiming to solve the problem in related technologies that due to large self-weight of the steel-concrete composite beam and low tensile strength of the concrete, the concrete bridge deck in the negative bending moment area of the composite beam is easy to crack, which poses a threat to the stiffness, durability and safety of the main girder. In the first aspect, a steel-concrete composite bridge deck structure is provided, comprising: an ultra-high performance concrete slab; a cross beam, which is arranged along transverse direction of bridge and is located below the ultra-high performance concrete slab, and the cross beam is connected to the ultra-high performance concrete slab by means of shear studs; and a steel rib, which is arranged along longitudinal direction of bridge, and the steel rib passes through the cross beam and is cross-fixed with the cross beam, and at the same time, the steel rib partially enters the ultra-high performance concrete slab. In some embodiments, the steel rib comprises a first vertical plate, the first vertical plate passes through the cross beam, and the top surface of the first vertical plate is higher than that of the cross beam; and the top of the first vertical plate is provided with a groove for receiving the cross beam, and there is a gap between the inner wall of the groove and the cross beam. In some embodiments, the cross beam comprises a transverse plate at the top thereof, the transverse plate is received in the groove, and the upper surface of the transverse plate is provided with the shear studs. In some embodiments, the steel rib further comprises a horizontal plate, which is fixed to the bottom of the first vertical plate; and the cross beam is is provided with an opening for the horizontal plate to pass through, and there is a gap between the inner wall of the opening and the horizontal plate. In some embodiments, the ultra-high performance concrete slab is provided with an upper-layer reinforcing mesh and a lower-layer reinforcing mesh, which are arranged side by side, wherein the upper-layer reinforcing mesh is located above the lower-layer reinforcing mesh, and the upper-layer reinforcing mesh comprises a first transverse reinforcement and a first longitudinal reinforcement, which are crisscrossed, and the first transverse reinforcement is located above the first longitudinal reinforcement; and the lower-layer reinforcing mesh comprises a second transverse reinforcement and a second longitudinal reinforcement, which are crisscrossed, and the second transverse reinforcement is located below the second longitudinal reinforcement. In some embodiments, the height of the top surface of the shear studs exceeds that of the lower-layer reinforcing mesh. In some embodiments, the top of the steel rib is provided with a row of circular openings, and the second transverse reinforcement passes through the circular openings. In some embodiments, the diameter of the circular opening is larger than that of the second transverse reinforcement. In some embodiments, the compressive strength of the ultra-high performance concrete slab is greater than or equal to 100 MPa, and the flexural strength is greater than or equal to 20 MPa; and an asphalt layer is laid on the surface of the ultra-high performance concrete slab. In the second aspect, a bridge is provided, comprising: the steel- concrete composite bridge deck structure mentioned above; and a steel girder, which is fixedly provided at the bottom of the steel-concrete composite bridge deck structure. The beneficial effects of the technical solution provided by the present invention comprise: The embodiment of the present invention provides a steel-concrete composite bridge deck structure and bridge, since the steel-concrete composite bridge deck structure has the cross beams and steel ribs, which are fixed with crisscross, the cross beam is connected to the ultra-high performance concrete slab by means of shear studs, and the steel rib partially enters the ultra-high performance concrete slab, the cross beam and the steel rib may be stressed together with the ultra-high performance concrete slab to enhance the overall tensile stiffness and flexural stiffness of the steel concrete composite bridge deck structure, so that the structure is not easily is deformed or deformed less; because the cross beam and the steel rib are set, and the ultra-high performance concrete slab is prepared by ultra-high performance concrete materials, the strength of the concrete slab is better, and the thickness of the ultra-high performance concrete slab may be designed to be thinner and lighter, with higher bearing capacity, reducing the overall weight of the steel-concrete composite bridge deck structure. Therefore, the overall stiffness of the steel-concrete composite bridge deck structure can be improved, and the overall strength, durability and safety of the bridge can also be improved at the same time.

Description of the Drawings

In order to better illustrate the technical solution in the embodiments of the present invention, the following will briefly introduce the drawings needed in the description of the embodiments, and it is obvious that the drawings in the following description are only a part of embodiments of the present invention, for those of ordinary skill in the art, other drawings may also be obtained based on these drawings without any creative work. Fig. 1 is a schematic diagram of a three-dimensional structure of a steel concrete composite bridge deck structure in the embodiment of the present invention; Fig. 2 is a sectional view of a steel-concrete composite bridge deck structure in the embodiment of the present invention; Fig. 3 is a sectional view of A-A in Fig. 2; Fig. 4 is a sectional view of another steel-concrete composite bridge deck structure in the embodiment of the present invention; Fig. 5 is a sectional view of an I-shaped steel girder of a bridge in the embodiment of the present invention; Fig. 6 is a sectional view of a channel-shaped (troughed) steel girder of a bridge in the embodiment of the present invention; Fig. 7 is a sectional view of a steel girder with truss structure of a bridge in the embodiment of the present invention. In the figures: 100. steel-concrete composite bridge deck structure; 1. ultra-high performance concrete slab; 2. cross beam; 21. transverse plate; 22. the second vertical plate; 221. opening; 3. shear stud; 4. steel rib; 41. the first vertical plate; 411. groove; 412. circular opening; is 42. horizontal plate; 5. lower-layer reinforcing mesh; 51. the second transverse reinforcement; 52. the second longitudinal reinforcement; 6. upper-layer reinforcing mesh; 61. the first transverse reinforcement; 62. the first longitudinal reinforcement; 7. asphalt layer; 200. steel girder.

Detailed Description of the Embodiments In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. The embodiment of the present invention provides a steel-concrete composite bridge deck structure and bridge, which can solve the problem that due to large self-weight of the steel-concrete composite beam and low tensile strength of the concrete, the concrete bridge deck in the negative bending moment area of the composite beam is easy to crack, thus posing a threat to the stiffness, durability and safety of the main girder. As shown in Fig. 1 and Fig. 2, a steel-concrete composite bridge deck structure 100 provided by the embodiment of the present invention may comprise: an ultra-high performance concrete slab 1, and in this embodiment, the thickness of the ultra-high performance concrete slab 1 is 80 mm to 120 mm; a cross beam 2, which is arranged along transverse direction ofbridge and is located below the ultra-high performance concrete slab 1, the cross beam 2 may be connected to the ultra-high performance concrete slab 1 by means of shear studs 3, and in this embodiment, the cross beam 2 is a steel plate and a plurality of cross beams are arranged, the plurality of cross beams 2 are arranged side by side along the longitudinal direction of bridge at intervals, generally, the spacing between two adjacent cross beams 2 is 2.5 is m to 3.5 m, and the top surface of each cross beam 2 is uniformly welded with one or more rows of shear studs 3; and a steel rib 4, which is arranged along longitudinal direction of bridge, the steel rib 4 passes through the cross beam 2 and is cross-fixed with the cross beam 2, in this embodiment, the steel rib 4 and the cross beam 2 are fixed by welding, and the lateral distance between adjacent steel ribs 4 is 400 mm to 800 mm; in other embodiments, the steel rib 4 may also be fixed with the cross beam 2 by means of screws or other methods; at the same time, the steel rib 4 partially enters the ultra high performance concrete slab 1. Specifically, the top of the steel rib 4 extends upward into the ultra-high performance concrete slab 1, and is consolidated with the ultra-high performance concrete slab 1 when the concrete is poured, and the cross beam 2 is also consolidated with the ultra high performance concrete slab 1 by means of the shear studs 3, so that the ultra-high performance concrete slab 1, the cross beam 2 and the steel rib 4 are fixed to each other in pairs, and finally the three are connected into a stable whole. Due to the arrangement of the steel rib 4, the tensile stiffness and the flexural stiffness of the steel-concrete composite bridge deck structure 100 along the longitudinal direction of bridge are improved. Combined with the characteristic of high tensile strength of the ultra-high performance concrete slab 1, the negative bending moment area in the longitudinal direction of bridge is not easy to crack. Due to the arrangement of the cross beam 2, the tensile strength and the flexural strength of the steel concrete composite bridge deck structure 100 along the transverse direction of bridge are also improved, so that on the basis of the cross beam 2 and the steel rib 4, the ultra-high performance concrete slab 1 of the steel-concrete composite bridge deck structure 100 may be designed to be thinner. As shown in Fig. 1 and Fig. 4, in some embodiments, the steel rib 4 may comprise a first vertical plate 41, the first vertical plate 41 perpendicularly passes through the cross beam 2, and the top surface of the first vertical plate 41 is higher than that of the cross beam 2, so that the top of the first vertical plate 41 may enter the ultra-high performance concrete slab 1 and be consolidated with the ultra-high performance concrete slab 1. A groove 411 for receiving the cross beam 2 may be provided on the top of the first vertical plate 41 corresponding to the position of the cross beam 2, and there may be a gap between the inner wall of the groove 411 and the cross beam 2, which is convenient for installation on the one hand, and may avoid fatigue cracks at the connection between the steel rib 4 and the cross beam 2 due to stress concentration on the other hand. In this embodiment, the groove 411 on the first vertical plate 41 is a square groove, and the groove 411 penetrates the top surface of the first vertical plate 41, which facilitates the insertion of the cross beam 2 into the groove 411. As shown in Fig. 1, in some alternative embodiments, the cross beam 2 may comprise a transverse plate 21 at the top thereof. The transverse plate 21 is received in the groove 411 to ensure the stability of the steel structure, and the upper surface of the transverse plate 21 is provided with shear studs 3, the transverse plate 21 is a flat plate along the transverse direction of bridge, and a plurality of rows of shear studs 3 may be welded on each transverse plate 21. Through setting the shear studs 3 on the transverse plate 21, the connection between the cross beam 2 and the ultra-high performance concrete slab 1 is strengthened, so as to ensure the stiffness in the transverse direction of bridge. As shown in Fig. 2 and Fig. 3, further, the steel rib 4 may also comprise a horizontal plate 42, which is fixed to the bottom of the first vertical plate 41. In this embodiment, the horizontal plate 42 and the first vertical plate 41 are fixed by welding, and the horizontal plate 42 is arranged perpendicular to the first vertical plate 41. The first vertical plate 41 has the thickness of 8 mm to 10 mm and the height of 170 mm to 300 mm, and the horizontal plate 42 has the thickness of 8 mm to 10 mm and the width of 120 mm to 240 mm. When the steel rib 4 is not provided with the horizontal plate 42, the first vertical plate 41 has the thickness of 16 mm to 22 mm and the height of 220 mm to 340 mm. The cross beam 2 may further comprise a second vertical plate 22 arranged perpendicular to the transverse plate 21. The first vertical plate 41 is inserted into the corresponding groove of the second vertical plate 22 and is fixed to the second vertical plate 22 by welding. The second vertical plate 22 may be provided with an opening 221 for the horizontal plate 42 to pass through, and there may be a gap between the inner wall of the opening 221 and the horizontal plate 42 to avoid possible stress concentration at the connection between the horizontal plate 42 and the second vertical plate 22 during welding, and to have good stress performance. In this embodiment, the cross beam 2 is a T-shape structure, and the transverse plate 21 has the width of 100 mm to 200 mm. In other embodiments, the cross beam 2 may also be an I-shape structure. As shown in Figs. 2 to 4, in some embodiments, the ultra-high performance concrete slab 1 may be provided with an upper-layer reinforcing mesh 6 and a lower-layer reinforcing mesh 5 which are arranged side by side. The upper-layer reinforcing mesh 6 is located above the lower layer reinforcing mesh 5, and the upper-layer reinforcing mesh 6 may comprise a first transverse reinforcement 61 and a first longitudinal reinforcement 62 that are crisscrossed, and the first transverse reinforcement 61 is located above the first longitudinal reinforcement 62. The lower-layer reinforcing mesh 5 comprises a second transverse reinforcement 51 and a second longitudinal reinforcement 52 that are crisscrossed. The second transverse reinforcement 51 is located below the second longitudinal reinforcement 52. Through arranging two layers of reinforcing meshes, and is the arrangement of the upper-layer reinforcing mesh 6 and the lower-layer reinforcing mesh 5 is different, when the steel-concrete composite bridge deck structure 100 is subjected to a negative bending moment downward along the transverse direction of bridge, the first transverse reinforcement 61 is supported on the first longitudinal reinforcement 62, which may enhance the transverse crack resistance of the steel-concrete composite bridge deck structure 100. In this embodiment, the distance between the ends of the first transverse reinforcement 61 and the second transverse reinforcement 51 and the outer surface of the ultra-high performance concrete slab 1 are both 10 mm to 15 mm, so as to prevent the steel reinforcement from being exposed to the air. As shown in Fig. 1 and Fig. 5, further, the height of the top surface of the shear studs 3 exceeds that of the lower-layer reinforcing mesh 5, so that the height of the shear studs 3 entering into the ultra-high performance concrete slab 1 is relatively high and the connection strength is relatively good, and the shear studs 3 may be inserted in the second transverse reinforcement 51 and second longitudinal reinforcement 52 that are crisscrossed, then the heads of the shear studs 3 may be blocked above by the lower-layer reinforcing mesh 5, thereby reducing the risk of falling off between the shear studs 3 and the ultra-high performance concrete slab 1. In this embodiment, the shear studs 3 has the height of 60 mm to 100 mm and the diameter of 19 mm to 25 mm, and the arrangement spacing of the shear studs 3 is 200 mm to 400 mm. As shown in Fig. 1 and Fig. 3, further, the top of the steel rib 4 is provided with a row of circular openings 412, and the second transverse reinforcement 51 may pass through the circular openings 412. In this embodiment, the circular openings 412 are provided on the first vertical plate 41, the spacing of the circular openings 412 is 50 mm to 100 mm, and the shortest distance between the upper boundary of the circular openings 412 and the top surface of the first vertical plate 41 is 10 mm. Through providing the circular openings 412 on the steel rib 4 for the second transverse reinforcement 51 to pass through, each part of the steel rib 4 is connected to the second transverse reinforcement 51, so as to form a connection system between the steel rib 4 and the reinforcing mesh in the ultra-high performance concrete slab 1, thereby further enhancing the connection strength of the steel rib 4 and the ultra-high performance concrete slab 1. As shown in Fig. 3, further, the diameter of the circular opening 412 may be greater than that of the second transverse reinforcement 51, so that the second transverse reinforcement 51 may be inserted into the circular opening 412 easily, and the situation that part of the second transverse reinforcements 51 may not be installed into the circular openings 412 may be avoided due to manufacturing errors. In this embodiment, the diameter of is the circular opening 412 is 8 mm to 12 mm larger than that of the second transverse reinforcement 51. As shown in Fig. 1, in some embodiments, the compressive strength of the ultra-high performance concrete slab 1 is greater than or equal to 100 MPa, and the flexural strength is greater than or equal to 20 MPa. The material composition of the ultra-high performance concrete slab 1 does not contain coarse aggregates, and should have good working performance and volume stability. The surface of the ultra-high performance concrete slab 1 may be laid with an asphalt layer 7. In this embodiment, the thickness of the asphalt layer 7 is 30 mm to 60 mm, which plays a role in waterproofing, abrasion-resistant, and improving driving comfort. As shown in Figs. 5 to 7, a bridge provided by the embodiment of the present invention may comprise: the steel-concrete composite bridge deck structure 100 mentioned above; and a steel girder 200 fixedly provided at the bottom of the steel-concrete composite bridge deck structure 100. The cross beam 2 may be a transverse diaphragm or a transverse rib of the steel girder 200, and the steel girder 200 has an I-shape or a channel-shape. When the steel girder 200 has the channel-shape, the steel girder 200 is a single-box or multi-box structure. The steel girder 200 may also be a two or more truss structure, the upper flange of the steel girder 200 may be welded with the shear studs 3 or other shear connectors to connect with the steel-concrete composite bridge deck structure 100. The principle of the steel-concrete composite bridge deck structure and bridge provided by the embodiment of the present invention is as follow: Since the steel-concrete composite bridge deck structure 100 has the cross beams 2 and the steel ribs 4, which are crisscrossed, the cross beams 2 are connected to the ultra-high performance concrete slab 1 by means of the shear studs 3, and the steel ribs 4 partially enter the ultra-high performance concrete slab 1, the cross beams 2 and steel ribs 4 may be stressed together with the ultra-high performance concrete slab 1 to enhance the overall tensile stiffness and flexural stiffness of the steel-concrete composite bridge deck structure 100, so that the structure is not easily deformed or deformed less, and has good structural system. Because the cross beams 2 and steel ribs 4 are set, and the ultra-high performance concrete slab is prepared by the ultra high performance concrete materials which have high durability, high workability and high volume stability, the strength of the concrete slab is better, the thickness of the ultra-high performance concrete slab 1 may be designed to be thinner and lighter, and bearing capacity is also higher, reducing the overall weight of the steel-concrete composite bridge deck structure 100, and the advantages of the mechanical properties of the ultra high performance concrete slab 1 with high strength and durability may be is fully taken to greatly reduce the cracking disease of the ultra-high performance concrete slab 1 in the steel-concrete composite bridge deck structure 100, and have lighter self-weight. The overall stiffness of the steel concrete composite bridge deck structure 100 can be improved, and the overall strength, durability, and safety of the bridge can also be improved at the same time, which has broad application prospects in the main girder of long-span steel bridges. In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, instead of indicating or implying that the pointed device or element must have a specific orientation, be configured and operated in a specific orientation, therefore it may not be understood as a limitation of the present invention. Unless otherwise clearly specified and limited, the terms "installation""connected" and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; further may be a mechanical connection, or an electrical connection; further may be directly connected, or indirectly connected through an intermediate medium, or may be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention may be understood according to specific circumstances. It should be noted that relational terms such as "first" and "second" are only for distinguishing one entity or operation from another entity or operation in the present invention, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only comprises those elements, but also comprises those that are not explicitly listed, or further comprises elements inherent to the process, method, article, or device. If there are no more restrictions, the elements defined by the sentence "comprising a..." does not exclude the existence of other same elements in the process, method, article, or device comprising the elements. The above-mentioned are only the embodiments of the present invention, so that those skilled in the art may understand or implement the present invention. For those skilled in the art, various modifications to these embodiments will be obvious, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be is limited to the embodiments shown in this document, but will be subject to the widest scope consistent with the principles and novel features applied herein.

Claims (5)

1. Claims 1. A steel-concrete composite bridge deck structure, comprising: an ultra-high performance concrete slab (1); a cross beam (2), which is arranged along transverse direction of bridge and is located below the ultra-high performance concrete slab (1), and the cross beam (2) is connected to the ultra-high performance concrete slab (1) by means of shear studs (3); and a steel rib (4), which is arranged along longitudinal direction of bridge, and the steel rib (4) passes through the cross beam (2) and is cross-fixed with the cross beam (2), and at the same time, the steel rib (4) partially enters the ultra-high performance concrete slab (4).
2. 2. The steel-concrete composite bridge deck structure according to claim 1, wherein the steel rib (4) comprises a first vertical plate (41), the first vertical plate (41) passes through the cross beam (2), and the top surface of the first is vertical plate (41) is higher than that of the cross beam (2); and the top of the first vertical plate (41) is provided with a groove (411) for receiving the cross beam (2), and there is a gap between the inner wall of the groove (411) and the cross beam (2).
3. 3. The steel-concrete composite bridge deck structure according to claim 2, wherein the cross beam (2) comprises a transverse plate (21) at the top thereof, the transverse plate (21) is received in the groove (411), and the upper surface of the transverse plate (21) is provided with the shear studs (3).
4. 4. The steel-concrete composite bridge deck structure according to claim 2, wherein the steel rib (4) further comprises a horizontal plate (42), which is fixed to the bottom of the first vertical plate (41); and the cross beam (2) is provided with an opening (221) for the horizontal plate (42) to pass through, and there is a gap between the inner wall of the opening (221) and the horizontal plate (42).
5. 5. Abridge, comprising: the steel-concrete composite bridge deck structure (100) according to any one of claims 1 to 4; and a steel girder (200), which is fixedly provided at the bottom of the steel- concrete composite bridge deck structure (100).