A corrugated steel-concrete composite bridge deck and bridge

Abstract

The present invention relates to the technical field of bridge decks, and provides a corrugated steel-concrete composite bridge deck and a bridge, wherein the corrugated steel-concrete composite bridge deck comprises a corrugated steel base plate and a steel skeleton; the steel skeleton comprises an upper steel mesh and a lower steel mesh; the upper steel mesh comprises an upper transverse reinforcement and an upper longitudinal reinforcement, and is located on the crest of the corrugated steel base plate; the lower steel mesh comprises a lower transverse reinforcement and a lower longitudinal reinforcement; the lower longitudinal reinforcement is distributed at intervals on the upper flange of the main beam; each trough comprises at least two lower transverse reinforcements; the corrugated steel base plate is not welded to the main beam, thereby solving the problems of large welding workload and high weld inspection cost between the corrugated steel base plate and the upper flange of the main beam in existing composite bridge decks; the steel skeleton with simple structural elements can be prefabricated in a factory and installed on site, thereby solving the on-site operation problem of complex steel skeleton and difficult binding, and the steel material consumption is low, saving engineering costs.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge decks, in particular to a corrugated steel-concrete composite bridge deck and a bridge. Background Art

[0002] The corrugated steel-concrete composite bridge deck is a widely used bridge deck that can be applied to bridges with different structures such as steel main beams and concrete main beams. It generally includes several corrugated steel base plates, which are overlapped between two adjacent main beams; a concrete slab is cast on top of the corrugated steel base plates, and end caps are connected to both ends of the corrugated steel base plates. On the one hand, they block the holes below the crest of the corrugated steel base plates to prevent leakage of concrete slurry, and on the other hand, they are used to weld the corrugated steel base plates to the top surface of the main beam; a steel bar skeleton is provided in the concrete slab; the existing steel bar skeleton generally includes at least three layers of steel mesh spaced apart in the height direction, and at the trough position, there are corrugated steel bars and triangular steel bars corresponding to the corrugated shape of the corrugated steel base plates, which on the one hand constitute shear reinforcement and on the other hand are used to longitudinally erect each layer of steel mesh to ensure that each layer of steel mesh is spaced apart in the height direction; at the trough position, reinforcing steel bars are also provided along the transverse direction of the bridge to resist the negative bending moment at the trough.

[0003] For existing undulating steel-concrete composite bridge decks, during construction, the undulating panels are first overlapped between adjacent main beams and welded to the main beams. The steel bars in the steel reinforcement skeleton are then tied together to form unit elements. The corrugated and triangular steel bars in the units are used as a guide for positioning and placement at the troughs. Finally, concrete is poured and cured. The existing undulating steel-concrete composite bridge decks have a complex steel reinforcement skeleton structure, and the resulting unit elements often struggle to accommodate the installation tolerances of the undulating steel base plate. The corrugated and triangular steel bars in the units cannot be accurately placed at the specified trough spacing. The actual construction situation is that all steel reinforcement components are installed separately and tied on-site, resulting in a large amount of on-site work, slowing construction speed, low efficiency, and long construction periods. Furthermore, according to welding specifications, after the undulating base plate is welded to the main beam, a 100% magnetic particle self-test and at least 20% magnetic particle spot tests are required. This testing is costly, and only qualified tests can be performed before proceeding to the next step. This further increases on-site workload and construction time, hindering the goal of bridge assembly. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems of large welding workload and inspection workload between the corrugated steel base plate and the main beam in the existing corrugated steel-concrete composite bridge deck, large amount of steel used in the steel skeleton, complex structure, and difficulty in binding, which lead to large on-site workload, long construction period, and high material and labor costs, and provide a corrugated steel-concrete composite bridge deck and bridge.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A corrugated steel-concrete composite bridge deck, comprising a corrugated steel base plate, a concrete slab, and a steel skeleton; the corrugated steel base plate has its corrugated edges extending in the longitudinal direction of the bridge; the corrugated steel base plate is overlapped on two adjacent main beams; the concrete slab is cast on the upper flanges of the main beams and the corrugated steel base plate; the steel skeleton is located within the concrete slab; the corrugated steel base plate is connected to the main beams by spot welding, intermittent welding, or no welding; the steel skeleton comprises an upper steel mesh and a lower steel mesh;

[0007] The upper steel mesh comprises an upper transverse reinforcement and an upper longitudinal reinforcement; the upper steel mesh is located on the crest of the corrugated steel bottom plate;

[0008] The lower layer of steel mesh includes lower layer longitudinal bars and lower layer transverse bars; the lower layer of longitudinal bars are arranged on the upper flange of the main beam and are spaced apart along the width direction of the main beam, and the lower layer of longitudinal bars abut against the side walls of the corrugated steel bottom plate to limit the corrugated steel bottom plate along the transverse bridge direction; the lower layer of transverse bars are arranged in the trough of the corrugated steel bottom plate, and each trough includes at least two of the lower layer of transverse bars spaced apart along the longitudinal bridge direction, and the lower layer of transverse bars abut against the side walls of the trough to limit the corrugated steel bottom plate along the longitudinal bridge direction.

[0009] The corrugated steel bottom plate refers to the existing corrugated steel-concrete composite bridge deck, and the upper steel mesh is designed based on the existing steel skeleton reinforcement method according to the actual load conditions. It can be designed in a form that includes transverse and longitudinal steel bars. The corrugated steel bottom plate and the main beam can be connected without welding, or they can be positioned by a small amount of spot welding or intermittent welding.

[0010] The lower longitudinal reinforcement of the lower steel mesh is arranged above the main beam, avoiding the corrugated steel bottom plate; the lower longitudinal reinforcement can abut against the side wall of the corrugated steel bottom plate, that is, the maximum spacing of the lower longitudinal reinforcement above a single main beam along the transverse bridge direction is less than or equal to the spacing between two adjacent corrugated steel bottom plates; and the lower transverse reinforcement is also arranged in the trough of the corrugated steel bottom plate, that is, the maximum spacing of the lower transverse reinforcement in each trough along the longitudinal bridge direction is less than half of the wavelength of the corrugated steel bottom plate waveform; so that the lower steel mesh of this solution can be directly installed as a whole from above the corrugated steel bottom plate, the lower longitudinal reinforcement will extend into the position between two adjacent corrugated steel bottom plates, and the lower transverse reinforcement will extend into the trough without interfering with the corrugated steel bottom plate;

[0011] At the same time, after the lower longitudinal reinforcement extends into the position between the two adjacent corrugated steel bottom plates, it will abut against the side walls of the corrugated steel bottom plates along the transverse direction of the bridge, thereby limiting the movement of the corrugated steel bottom plates relative to the main beam in the transverse direction of the bridge; and when the lower transverse reinforcement moves toward the bottom surface of the trough under the action of gravity, the transverse reinforcements located on both sides of the lower transverse reinforcement along the longitudinal direction of the bridge will abut against the corresponding side walls of the trough respectively, thereby limiting the movement of the corrugated steel bottom plates relative to the main beam in the longitudinal direction of the bridge; that is, this solution can limit the displacement of the corrugated steel bottom plates relative to the main beam;

[0012] At the same time, the transverse reinforcement of the lower transverse reinforcement abuts against the side wall of the trough and can also prevent the lower steel mesh from continuing to move downward, so that there is a distance between the lower steel mesh and the bottom surface of the trough, keeping the height of the lower steel mesh between the upper surface of the crest of the corrugated steel bottom plate and the upper surface of the trough, and the distance can be adjusted by adjusting the size of the lower transverse reinforcement along the longitudinal direction of the bridge.

[0013] The reinforcement skeleton of the corrugated steel-concrete composite bridge deck of the present scheme includes an upper steel mesh and a lower steel mesh, wherein the upper steel mesh can be directly placed above the corrugated steel bottom plate without being welded to the corrugated steel bottom plate, and the transverse steel bars of the lower steel mesh, as mentioned above, will abut against the side walls of the trough under the action of gravity, so that the height of the lower steel mesh is maintained between the upper surface of the wave crest and the upper surface of the trough, and there is no need to weld to the corrugated steel bottom plate; that is, the reinforcement skeleton of the present scheme, while including multiple layers of reinforcement mesh, does not need to be supported by corrugated steel bars and triangular steel bars to maintain the relative position of the reinforcement mesh along the height direction as in the prior art, nor does it need to be welded to the corrugated steel bottom plate as in the prior art, thereby reducing the shape complexity and type of the reinforcement in the reinforcement skeleton, thereby reducing the amount of steel used in the reinforcement skeleton, the difficulty of tying, the amount of tying work and the construction cost; on the other hand, it can reduce the amount of welding work and the corresponding weld quality inspection workload of the reinforcement skeleton, thereby simplifying the construction process, increasing the construction speed, and reducing the construction period and construction cost;

[0014] As mentioned above, the shape of the lower steel mesh and the shape of the corrugated steel bottom plate cooperate with each other, and the position limitation of the corrugated steel bottom plate relative to the main beam can be achieved by clamping. Therefore, this solution can eliminate the welding structure and corresponding welding operations at the overlap of the corrugated steel bottom plate and the main beam, such as the welding of the end sealing plate and the end sealing plate to the main beam, thereby further reducing the welding workload and eliminating the corresponding weld quality inspection work; at the same time, if the end sealing plate is eliminated, this solution can also maintain the cross-bridge connection above the trough of the corrugated steel bottom plate, thereby ensuring the continuity of the steel skeleton and the concrete slab above the trough, so that this solution can have a better stress state and reduce the possibility of tensile damage;

[0015] At the same time, compared with the existing scheme that needs to ensure the position accuracy of each steel bar and the shape accuracy of the corrugated steel bar, this scheme only needs to ensure the position accuracy of each steel bar in the lower longitudinal bar and the lower transverse bar during installation. It has low requirements on the accuracy of the corrugated steel base plate and the steel bar skeleton, and has stronger error adaptability.

[0016] As a preferred solution of the present invention, the number of layers of the upper steel mesh is greater than or equal to one; and the upper steel mesh is distributed at intervals along the height direction.

[0017] The specific number of layers and distribution spacing of the upper steel meshes are determined according to the specific thickness and load conditions of the concrete slab; when the number of upper steel meshes is greater than one, the upper steel meshes can be distributed at equal intervals.

[0018] This solution recommends that the number of upper steel mesh layers be greater than one and that they be spaced apart in the height direction, which can increase the density of steel bars in the portion of the concrete slab above the upper surface of the crest of the corrugated steel base plate, thereby ensuring the strength and bearing capacity of the concrete slab at the corresponding position and reducing the possibility of cracking.

[0019] As a preferred solution of the present invention, it also includes vertical stirrups; the vertical stirrups connect all the upper steel meshes along the height direction.

[0020] With reference to existing technologies, vertical stirrups can be in various forms, such as closed stirrups or open stirrups. The specific selection depends on the actual structure of the upper steel mesh.

[0021] This solution recommends using vertical stirrups to connect the upper steel meshes along the height direction. On the one hand, connecting the upper steel meshes into a whole can facilitate overall transportation and lifting, thereby improving construction efficiency. On the other hand, after the concrete slab is poured, it can vertically connect the concrete structure to avoid upper and lower faults in the concrete slab, while also reducing the possibility of cracking the concrete slab.

[0022] As a preferred solution of the present invention, the vertical stirrups are arranged in the troughs of the corrugated steel bottom plate.

[0023] Since the concrete slab above the trough of the corrugated steel bottom plate is relatively thick, this scheme further recommends setting the stirrups at the position corresponding to the trough of the corrugated steel bottom plate, so that the vertical stirrups can be easily extended to the inside of the trough of the corrugated steel bottom plate, which can enhance the vertical connection of the concrete slab above the trough of the corrugated steel bottom plate, reduce the upper and lower fault phenomenon of the concrete slab at the corresponding position, and reduce the possibility of cracking.

[0024] As a preferred embodiment of the present invention, the sum of the cross-sectional areas of the lower layer of transverse reinforcement bars is greater than or equal to the available fillet weld area at the overlap between the corrugated steel bottom plate and the main beam.

[0025] The cross-sectional area of ​​the lower transverse reinforcement refers to the sum of the cross-sectional areas of all transverse reinforcements in all the lower transverse reinforcements in the vertical plane parallel to the longitudinal direction of the bridge; the available fillet weld area at the lap joint of the corrugated steel bottom plate and the main beam generally refers to 0.7 times the product of the length of the corrugated steel bottom plate along the longitudinal direction of the bridge and the size of the weld along the transverse direction of the bridge.

[0026] This scheme recommends that the sum of the cross-sectional areas of all lower-layer transverse reinforcements be greater than or equal to the weld area at the overlap between the corrugated steel bottom plate and the main beam, which can ensure that the tensile bearing capacity in the transverse direction of the bridge provided by the lower-layer transverse reinforcement is greater than the shear bearing capacity of the weld at the overlap between the corrugated steel bottom plate and the main beam. Therefore, even if the weld at the overlap between the corrugated steel bottom plate and the main beam is eliminated, this scheme can still withstand the positive bending moment along the transverse direction of the bridge and the local tensile stress at the overlap position.

[0027] As a preferred solution of the present invention, blocking plates are provided at both ends along the transverse direction below the wave crest of the corrugated steel bottom plate.

[0028] The blocking plate can be in various forms, such as providing an independent blocking plate under each wave crest; the blocking plate can be a temporary structure or a permanent structure.

[0029] This solution recommends setting up sealing plates at both ends of the corrugated steel base plate in the width direction, which can prevent the concrete slurry from leaking from under the crest of the corrugated steel base plate when pouring the concrete slab; at the same time, compared with the existing technology that uses complete end sealing plates with a height matching the full height of the corrugated steel base plate, this solution can save materials and corresponding costs.

[0030] As a preferred solution of the present invention, the lower layer transverse reinforcement is arranged along the transverse direction of the bridge and extends throughout the length of the concrete slab.

[0031] Since the corrugated steel bottom plate of this scheme only covers the area below the crest, so that the upper part of the trough remains horizontally continuous, this scheme can also keep the lower transverse reinforcement continuous along the transverse bridge direction, thereby ensuring the continuity of the lower steel mesh along the transverse bridge direction and the continuity of the corresponding part of the concrete slab, so that this scheme has a better stress state and reduces the possibility of tensile failure.

[0032] As a preferred solution of the present invention, the upper transverse reinforcement and the upper longitudinal reinforcement are both straight steel bars.

[0033] The upper transverse reinforcement and the upper longitudinal reinforcement of this solution are both straight steel bars. Compared with the existing technology with corrugated steel bars and triangular steel bars, the complexity of the shape of the upper steel mesh can be reduced, thereby reducing the difficulty of manufacturing, construction, and binding the upper steel mesh, and saving the manufacturing and construction costs of the upper steel mesh.

[0034] A bridge comprises main beams, wherein the main beams are spaced apart along the transverse direction of the bridge, and also comprises a corrugated steel-concrete composite bridge deck of the present invention.

[0035] The bridge of this scheme adopts a corrugated steel-concrete composite bridge deck of the present invention. The structure of the steel skeleton is simpler than that of the existing technology, which can reduce the manufacturing difficulty and manufacturing cost. It is also more convenient to reduce the workload on the construction site through prefabrication, thereby improving construction efficiency and shortening the construction period.

[0036] At the same time, during construction, this solution can not only save the welding work of the corrugated steel bottom plate and the main beam, but also save the welding work of the steel skeleton and the corrugated steel bottom plate, thereby greatly reducing the amount of welding work and eliminating the corresponding weld quality inspection work, thereby simplifying the construction process, increasing the construction speed, reducing the construction period and construction cost; and in the operation stage, when the corrugated steel-concrete composite bridge deck is subjected to tensile and compressive fatigue loads, the steel skeleton in the concrete slab can restrain the concrete and prevent the corrugated steel-concrete composite bridge deck from fatigue damage, making this solution reliable and having a long service life.

[0037] As a preferred solution of the present invention, shear nails are distributed on the upper surface of the main beam.

[0038] This solution recommends installing shear nails on the upper surface of the main beam, which can increase the transverse shear force transmission path between the concrete slab and the main beam, reduce the slippage and shear damage of the concrete slab relative to the main beam, and thus enhance the shear strength of the concrete slab.

[0039] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0040] 1. The steel frame of the corrugated steel-concrete composite bridge deck of the present invention comprises an upper steel mesh and a lower steel mesh, wherein the upper steel mesh can be directly placed above the corrugated steel base plate without being welded to the corrugated steel base plate, and the transverse steel bars of the lower steel mesh, as mentioned above, will abut against the side walls of the trough under the action of gravity, so that the height of the lower steel mesh is maintained between the upper surface of the wave crest and the upper surface of the trough, and there is no need to weld to the corrugated steel base plate; that is, the steel frame of this solution, while comprising multiple layers of steel mesh, does not require the steel mesh to be supported by corrugated steel bars and triangular steel bars to maintain the relative position of the steel mesh in the height direction as in the prior art, nor does it require the steel frame to be welded to the corrugated steel base plate as in the prior art. This can, on the one hand, reduce the complexity and variety of the shapes of the steel bars in the steel frame, thereby reducing the amount of steel used, the difficulty of tying, the amount of tying work, and the construction cost; on the other hand, it can reduce the amount of welding work of the steel frame and the corresponding workload of weld quality inspection, thereby simplifying the construction process, increasing the construction speed, and reducing the construction period and construction cost;

[0041] As mentioned above, the shape of the lower steel mesh and the shape of the corrugated steel bottom plate cooperate with each other, and the position limitation of the corrugated steel bottom plate relative to the main beam can be achieved by clamping. Therefore, this solution can also eliminate the welding structure and corresponding welding operations at the overlap of the corrugated steel bottom plate and the main beam, such as the welding of the end sealing plate and the end sealing plate and the main beam, thereby further reducing the welding workload and eliminating the corresponding weld quality inspection work; at the same time, if the end sealing plate is eliminated, this solution can also keep the trough of the corrugated steel bottom plate connected in the transverse direction of the bridge, thereby ensuring the continuity of the steel skeleton and the concrete slab above the trough, so that this solution can have a better stress state and reduce the possibility of tensile damage;

[0042] At the same time, compared with the existing scheme that needs to ensure the position accuracy of each steel bar and the shape accuracy of the corrugated steel bar, this scheme only needs to ensure the position accuracy of each steel bar in the lower longitudinal bar and the lower transverse bar during installation. It has low requirements on the accuracy of the corrugated steel base plate and the steel bar skeleton, and has stronger error adaptability.

[0043] 2. The bridge of the present invention adopts a corrugated steel-concrete composite bridge deck of the present invention. The structure of the steel skeleton is simpler than that of the existing technology, which can reduce the manufacturing difficulty and manufacturing cost. It is also more convenient to reduce the workload on the construction site through prefabrication, thereby improving construction efficiency and shortening the construction period.

[0044] At the same time, during construction, this solution can not only save the welding work of the corrugated steel bottom plate and the main beam, but also save the welding work of the steel skeleton and the corrugated steel bottom plate, thereby greatly reducing the amount of welding work and eliminating the corresponding weld quality inspection work, thereby simplifying the construction process, increasing the construction speed, reducing the construction period and construction cost; and in the operation stage, when the corrugated steel-concrete composite bridge deck is subjected to tensile and compressive fatigue loads, the steel skeleton in the concrete slab can restrain the concrete and prevent the corrugated steel-concrete composite bridge deck from fatigue damage, making this solution reliable and having a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic cross-sectional view of a corrugated steel-concrete composite bridge deck according to the present invention, in the longitudinal direction of the bridge, with the concrete slab hidden;

[0046] Figure 2 It is a schematic cross-sectional view of a corrugated steel-concrete composite bridge deck according to the present invention along the transverse direction of the bridge;

[0047] Figure 3 It is a schematic cross-sectional view of a corrugated steel-concrete composite bridge deck according to the present invention along the longitudinal direction of the bridge;

[0048] Figure 4 It is a top view schematic diagram of the upper steel mesh of a corrugated steel-concrete composite bridge deck of the present invention;

[0049] Figure 5 is a graph showing the load and the tensile stress at the joint between the corrugated steel bottom plate and the main beam in Example 2;

[0050] Figure 6 This is a schematic cross-sectional view of a corrugated steel-concrete composite bridge deck in the prior art, with the concrete slab hidden, along the longitudinal direction of the bridge;

[0051] Figure 7 This is a cross-sectional schematic diagram of a corrugated steel-concrete composite bridge deck in the prior art in the concrete slab state along the transverse direction of the bridge;

[0052] Figure 8 This is an exploded schematic diagram of the longitudinal reinforcement structure of a corrugated steel-concrete composite bridge deck in the prior art;

[0053] Figure 9 This is an exploded schematic diagram of the transverse reinforcement structure of a corrugated steel-concrete composite bridge deck in the prior art;

[0054] Icons: 1-corrugated steel base plate; 2-upper steel mesh; 3-lower steel mesh; 4-main beam; 6-sealing plate; 7-concrete slab; 21-upper transverse reinforcement; 22-upper longitudinal reinforcement; 23-vertical stirrups; 31-lower longitudinal reinforcement; 32-lower transverse reinforcement; 81-first transverse reinforcement; 82-second transverse reinforcement; 83-third transverse reinforcement; 84-fourth transverse reinforcement; 91-first longitudinal reinforcement; 92-second longitudinal reinforcement; 93-triangular reinforcement; 94-corrugated reinforcement; 95-negative bending moment zone reinforcement. DETAILED DESCRIPTION

[0055] The present invention will be described in detail below with reference to the accompanying drawings.

[0056] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0057] Example 1

[0058] like Figures 1 to 4As shown, the present invention adopts a corrugated steel-concrete composite bridge deck, comprising a corrugated steel base plate 1, a steel skeleton and a concrete plate 7. The concrete plate 7 is cast above the corrugated steel base plate 1, and the steel skeleton is located inside the concrete plate 7; the steel skeleton comprises an upper steel mesh 2 and a lower steel mesh 3; the upper steel mesh 2 is located above the upper surface of the crest of the corrugated steel base plate 1; the lower steel mesh 3 is located between the upper surface of the crest and the upper surface of the trough of the corrugated steel base plate 1; the lower steel mesh 3 can be fixedly connected to the main beam 4; the lower steel mesh 3 comprises a lower The lower longitudinal reinforcement 31 and the lower transverse reinforcement 32; the lower longitudinal reinforcement 31 is spaced apart along the width direction of the corrugated steel base plate 1 and the position avoids the corrugated steel base plate 1, and the spacing of the lower longitudinal reinforcement 31 corresponds to the width of the corrugated steel base plate 1; the lower transverse reinforcement 32 is spaced apart along the length direction of the corrugated steel base plate 1 and the position corresponds to the trough of the corrugated steel base plate 1, the lower transverse reinforcement 32 includes at least two transverse reinforcements spaced apart along the length direction of the corrugated steel base plate 1, and the size of the lower transverse reinforcement 32 along the length direction of the corrugated steel base plate 1 is less than half of the wavelength of the corrugated steel base plate 1.

[0059] Specifically, if Figure 1 As shown, the waveform of the corrugated steel base plate 1 is a trapezoidal wave, the length of the corrugated steel base plate 1 is determined according to the length of the bridge deck, and the width of the corrugated steel base plate 1 is wider than the spacing between two adjacent main beams 4, so that the two ends of the corrugated steel base plate 1 can be respectively overlapped on top of the main beams 4 on both sides; specifically, the wavelength of the corrugated steel base plate 1 of this embodiment is forty-two millimeters, and the full height of the corrugated steel base plate 1 is fifteen millimeters; the width of the corrugated steel base plate 1 is wider than the supporting spacing of the bridge deck between two adjacent main beams 4 by at least twelve centimeters, so that the width of the parts where the two ends of the corrugated steel base plate 1 are respectively overlapped on the upper surface of the main beam 4 is at least six centimeters; the thickness of the corrugated steel base plate 1 is three point five to eight millimeters.

[0060] Blocking plates 6 are provided at both ends of the corrugated steel base plate 1 along its width to prevent grout leakage below the crests of the corrugated steel base plate 1. The blocking plates 6 only cover the area below the crests of the corrugated steel base plate 1. In this embodiment, a separate blocking plate 6 is provided below each crest to block the area below the crest.

[0061] The upper steel mesh 2 includes upper transverse reinforcement 21 and upper longitudinal reinforcement 22, and both the upper transverse reinforcement 21 and the upper longitudinal reinforcement 22 are straight steel bars, the axis of the upper transverse reinforcement 21 is arranged along the width direction of the corrugated steel base plate 1, and the upper transverse reinforcement 21 is spaced apart along the length direction of the corrugated steel base plate 1; the axis of the upper longitudinal reinforcement 22 is arranged along the length direction of the corrugated steel base plate 1, and the upper longitudinal reinforcement 22 is spaced apart along the width direction of the corrugated steel base plate 1; the diameters of the upper transverse reinforcement 21 and the upper longitudinal reinforcement 22 are both twelve millimeters; and the number of layers of the upper steel mesh 2 is two, and the upper steel mesh 2 is spaced apart along the height direction; the upper steel mesh 2 closer to the corrugated steel base plate 1 is provided with two upper transverse reinforcements 21 at each trough and one upper transverse reinforcement 21 at each crest; the upper steel mesh 2 farther away from the corrugated steel base plate 1 is provided with two upper transverse reinforcements 21 at each trough and crest.

[0062] There are also several vertical stirrups 23 distributed between the two upper layers of steel mesh 2; the vertical stirrups 23 are spaced apart along the length and width directions of the corrugated steel base plate 1 to form a rectangular array, and the position of the vertical stirrups 23 along the length direction of the corrugated steel base plate 1 corresponds to the trough of the corrugated steel base plate 1; the vertical stirrups 23 vertically connect the upper and lower layers of upper transverse bars 21 at each trough; specifically, the vertical stirrups 23 are rectangular stirrups arranged along the length direction of the corrugated steel base plate 1, and the lower ends of the vertical stirrups 23 are open; the four upper transverse bars 21 above each trough are all connected to the inner side of the rectangular stirrups; the lower ends of the vertical stirrups 23 extend toward the trough and reach the upper surface of the trough.

[0063] like Figure 2 As shown, each lower longitudinal reinforcement 31 includes four straight steel bars arranged along the length direction of the corrugated steel base plate 1, and the diameter thereof is twelve millimeters; each lower transverse reinforcement 32 includes two straight steel bars arranged along the width direction of the corrugated steel base plate 1, and the diameter thereof is twenty-eight millimeters, and the spacing is fourteen millimeters. On the one hand, the lower steel mesh 3 can be stuck at a height of one to three millimeters from the bottom plate of the corrugated steel base plate 1, and on the other hand, the sum of the cross-sectional areas of the lower transverse reinforcement 32 is larger than the weld area at the overlap between the corrugated steel base plate 1 and the main beam 4.

[0064] like Figure 6 and Figure 9As shown, in the case of the same three-layer steel mesh, the prior art includes at least four types of longitudinal steel bars, namely, a first longitudinal steel bar 91 and a second longitudinal steel bar 92 directly arranged along the longitudinal bridge direction and located at different heights, a corrugated steel bar 94 matching the waveform of the corrugated steel bottom plate 1, and a triangular steel bar 93 located above the trough; four types of transverse steel bars, namely, a first transverse steel bar 81 connected to the bottom surface of the first longitudinal steel bar 91, a second transverse steel bar 82 located in the triangular steel bar 93, a third transverse steel bar 83 located at the trough of the corrugated steel bar 94, and a fourth transverse steel bar 84 connected to the top surface of the second longitudinal steel bar 92 and located inside the triangular steel bar 93; at the same time, vertical reinforcements need to be further arranged between the three layers of steel mesh. At the same time, negative bending moment reinforcement ribs 95 are provided in the negative bending moment area in the transverse direction of the bridge; it can be seen that the steel skeleton of the prior art is complicated in shape, which makes processing, manufacturing and on-site binding very difficult; while the upper transverse reinforcement 21, the upper longitudinal reinforcement 22, the lower longitudinal reinforcement 31 and the lower transverse reinforcement 32 of the present embodiment are all straight steel bars, and the upper transverse reinforcement 21 is relatively to the upper longitudinal reinforcement 22, and the lower longitudinal reinforcement 31 is relatively to the lower transverse reinforcement 32. They are all simply orthogonal in distribution, thereby forming a planar upper steel mesh 2 and a lower steel mesh 3 respectively. The simple shape can reduce the difficulty of manufacturing, construction and binding of the steel skeleton, and save the manufacturing and construction costs of the steel skeleton; specifically, the steel material consumption of the present embodiment is about 140kg / m 2 The existing technology uses about 250kg / m 2 .

[0065] The total thickness of the concrete slab 7 of this embodiment is 30 mm, of which the thickness of the portion located above the trough is 30 mm, and the thickness of the portion located above the crest is 15 mm. During pouring, C40 steel fiber concrete with a weight of 50 to 90 kg per cubic meter is used, and the tensile strength of the concrete is greater than or equal to 5 MPa.

[0066] During construction, you can proceed as follows:

[0067] A. Overlap each corrugated steel base plate 1 between two adjacent main beams 4; after the corrugated steel base plates 1 are placed, position them. The positioning method can refer to the existing technology, such as spot welding the four corner points of the corrugated steel base plates 1 to the main beams 4, or other methods that do not require welding can be used;

[0068] B. Place the lower steel mesh 3 above the corrugated steel base plate 1, with the lower longitudinal reinforcement 31 positioned between two adjacent corrugated steel base plates 1 and the lower transverse reinforcement 32 positioned at the trough. Move the lower steel mesh 3 toward the upper surface of the trough of the corrugated steel base plate 1 until the lower transverse reinforcement 32 abuts against the side wall of the trough. The movement can be performed by the lower steel mesh 3 sinking under its own weight or with the assistance of an external force. After the lower steel mesh 3 is in place, the lower longitudinal reinforcement 31 and the lower transverse reinforcement 32 can constrain the freedom of movement of the corrugated steel base plate 1 along the width and length directions of the corrugated steel base plate 1, respectively.

[0069] C. Place the upper steel mesh 2 on the upper surface of the corrugated steel base plate 1; pour the concrete slab 7; within five minutes of vibrating the concrete slab 7, cover it with thick plastic film and allow it to dry and cure for at least four days;

[0070] D. Complete the construction of the corrugated steel-concrete composite bridge deck.

[0071] Example 2

[0072] A bridge adopted in this embodiment includes main beams 4, which are spaced apart along the transverse direction of the bridge; the spacing between the main beams 4 is less than or equal to 1.8 meters, and the bridge deck support spacing of the main beams 4 is less than or equal to 1.25 meters; the corrugated steel-concrete composite bridge deck in Example 1 is arranged above the main beams 4; the corrugated steel bottom plate 1 of the corrugated steel-concrete composite bridge deck is overlapped between two adjacent main beams 4; shear nails are distributed in the area above the main beams 4 that is not overlapped with the corrugated steel bottom plate 1.

[0073] Theoretical calculations of a bridge used in this embodiment show that the neutral axis position of the bridge structure system of this embodiment is below the bridge deck and on the web of the main beam 4. The bridge deck structure is in a compressive state in the longitudinal direction of the bridge, and relies on the compressive resistance of concrete to give full play to the mechanical properties of concrete materials; the bridge deck structure is in a tensile state in the transverse direction of the bridge. Under the most unfavorable stress state of this system, the transverse tensile stress at the lap joint of the corrugated steel bottom plate 1 and the main beam 4 is less than or equal to three MPa, and the tensile strength of the concrete itself is greater than or equal to eight MPa, which meets the tensile bearing capacity requirements. In addition, the tensile and shear resistance of welds are replaced by the tensile and shear resistance of steel bars, which increases the safety reserve of the structure.

[0074] This embodiment also carried out a model experiment, and the load of the model experiment and the stress curve at the joint of the corrugated steel bottom plate 1 and the main beam 4 are shown as follows: Figure 5As shown, the experiment shows that the first crack occurs when the tensile stress along the width direction of the corrugated steel bottom plate 1 at the joint between the corrugated steel bottom plate 1 and the main beam 4 reaches 12 MPa. As the load increases, the crack slowly develops upward along the bottom edge. The cracking stress value is four times the design stress, and the structural safety reserve is large. In addition, this loading point simulates a heavy wheel load of about 70 kilonewtons. In fact, the bridge deck is loaded to the limit value of the loading equipment, about 450 kilonewtons, and no fracture damage occurs. The potential ultimate bearing capacity of the structure is large.

[0075] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A corrugated steel-concrete composite bridge deck, comprising a corrugated steel base plate (1), a concrete plate (7) and a steel skeleton; the corrugated steel base plate (1) has its waves extending in the longitudinal direction of the bridge; the corrugated steel base plate (1) is overlapped on two adjacent main beams (4); the concrete plate (7) is cast on the upper flange of the main beam (4) and the corrugated steel base plate (1); the steel skeleton is located inside the concrete plate (7); and is characterized in that: The corrugated steel bottom plate (1) is connected to the main beam (4) by spot welding, intermittent welding or non-welding; the steel bar skeleton comprises an upper steel mesh (2) and a lower steel mesh (3); The upper steel mesh (2) comprises an upper transverse reinforcement (21) and an upper longitudinal reinforcement (22); the upper steel mesh (2) is located on the wave crest of the corrugated steel bottom plate (1); The lower layer steel mesh (3) comprises a lower layer longitudinal reinforcement (31) and a lower layer transverse reinforcement (32); the lower layer longitudinal reinforcement (31) is arranged on the upper flange of the main beam (4) and is spaced apart along the width direction of the main beam (4); the lower layer longitudinal reinforcement (31) abuts against the side wall of the corrugated steel bottom plate (1) to limit the position of the corrugated steel bottom plate (1) in the transverse direction; the lower layer transverse reinforcement (32) is arranged in the trough of the corrugated steel bottom plate (1), and each trough comprises at least two lower layer transverse reinforcements (32) spaced apart along the longitudinal direction; the lower layer transverse reinforcement (32) abuts against the side wall of the trough to limit the position of the corrugated steel bottom plate (1) in the longitudinal direction.

2. The corrugated steel-concrete composite bridge deck according to claim 1, characterized in that: The number of layers of the upper steel mesh (2) is greater than or equal to one; and the upper steel mesh (2) is distributed at intervals along the height direction.

3. The corrugated steel-concrete composite bridge deck according to claim 2, characterized in that: It also includes vertical stirrups (23); the vertical stirrups (23) connect all the upper steel meshes (2) along the height direction.

4. The corrugated steel-concrete composite bridge deck according to claim 3, characterized in that: The vertical stirrups (23) are arranged in the troughs of the corrugated steel bottom plate (1).

5. The corrugated steel-concrete composite bridge deck according to any one of claims 1 to 4, characterized in that: The sum of the cross-sectional areas of the lower layer transverse reinforcements (32) is greater than or equal to the available fillet weld area at the overlap between the corrugated steel bottom plate (1) and the main beam (4).

6. The corrugated steel-concrete composite bridge deck according to any one of claims 1 to 4, characterized in that: Blocking plates (6) are provided at both ends of the corrugated steel bottom plate (1) below the wave crest along the transverse bridge direction.

7. The corrugated steel-concrete composite bridge deck according to claim 6, characterized in that: The lower layer transverse reinforcement (32) is arranged along the transverse bridge direction and extends through the length of the concrete slab (7).

8. The corrugated steel-concrete composite bridge deck according to any one of claims 1 to 4, characterized in that: The upper transverse reinforcement (21) and the upper longitudinal reinforcement (22) are both straight-line reinforcements.

9. A bridge comprising main beams (4), wherein the main beams (4) are spaced apart in a transverse direction of the bridge, characterized in that: It also comprises a corrugated steel-concrete composite bridge deck as described in any one of claims 1 to 8.

10. The bridge according to claim 9, characterized in that: Shear nails are distributed on the upper surface of the main beam (4).

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