Steel bottom plate structure of bridge panel and steel-concrete combined bridge panel

Abstract

The utility model relates to a steel bottom plate structure of a bridge panel and a steel-concrete combined bridge panel, the steel bottom plate structure comprises a steel bottom plate and a plurality of shear keys, the periphery of the steel bottom plate is bent downwards to form a steel bottom plate body and a supporting part, and the supporting part enables the surface of the steel bottom plate body to be kept horizontal; the shear keys are sequentially arranged on the surface of the steel bottom plate body at equal intervals in the longitudinal bridge direction. The steel-concrete combined bridge panel comprises a steel bottom plate structure, a bridge main truss, a steel plate beam structure and a reinforced concrete layer. Low stress concentration of the steel bottom plate structure in the assembling and welding process can be achieved, and the construction efficiency and quality are improved.

Description

Technical Field

[0001] The present application relates to the technical field of bridge steel structures, and in particular to a steel bottom plate structure of a bridge panel and a steel-concrete composite bridge panel. Background Art

[0002] The steel-concrete composite bridge structure takes into account the respective advantages of steel structure and concrete, has been widely used in the field of steel structure bridges, and has now become the preferred option for large-span main beams.

[0003] The traditional process of using full-bridge supports or steel plate bottom formwork for cast-in-place bridge deck construction is relatively complicated. The prefabricated bridge deck is heavy, resulting in excessive consumption of steel for the entire bridge structure, which increases construction costs. In addition, when the steel bottom plate is being dismantled and newly installed, it is easy to have problems with formwork backlog or untimely supply, resulting in delays in the construction period.

[0004] Therefore, it is necessary to propose a solution to improve one or more problems existing in the above-mentioned related technical solutions.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0006] A first aspect of an embodiment of the present application provides a steel bottom plate structure of a bridge deck, comprising:

[0007] A steel bottom plate, wherein the periphery of the steel bottom plate is bent downward to form a steel bottom plate body and a support portion, wherein the support portion keeps the surface of the steel bottom plate body horizontal;

[0008] A plurality of shear keys are arranged on the surface of the steel bottom plate body in sequence and at equal intervals along the longitudinal direction of the bridge.

[0009] In an exemplary embodiment of the present application, the steel bottom plate is rectangular, a bending line is provided near the edge line of each side of the steel bottom plate, and the bending lines on two opposite sides of the steel bottom plate are parallel to each other;

[0010] After bending, the support portion at the bottom keeps the surface of the steel bottom plate body at the top horizontal.

[0011] In an exemplary embodiment of the present application, the support portion includes two opposite long side supports and two opposite short side supports, and the two long side supports and the two short side supports enable the steel base plate body to maintain a level surface.

[0012] In an exemplary embodiment of the present application, the bending angle is greater than 0° and less than 90°.

[0013] In an exemplary embodiment of the present application, a gap is provided at a connection between each of the long side supports and the short side supports.

[0014] In an exemplary embodiment of the present application, the shear key is a PBL shear key.

[0015] In an exemplary embodiment of the present application, the structure of each of the PBL shear keys is the same, and each of the PBL shear keys includes openings arranged at equal intervals; after the welding of all the PBL shear keys and the steel base plate body is completed, the cross bridge is upward, and the centers of the openings at the same position on all the PBL shear keys are on the same horizontal line.

[0016] In an exemplary embodiment of the present application, the butt gap of each of the PBL shear keys ranges from 4 to 25 mm; and the radius of the opening ranges from 5 to 30 mm.

[0017] In an exemplary embodiment of the present application, the lengths of all the PBL shear keys are greater than the width of the steel base plate body, and both ends of each of the PBL shear keys extend out of the steel base plate body.

[0018] A second aspect of the embodiment of the present application provides a steel-concrete composite bridge panel, comprising the steel bottom plate structure of the bridge panel, as well as a bridge main truss, a steel plate beam structure and a reinforced concrete layer; wherein the steel plate beam structure is arranged between two vertically arranged parallel bridge main trusses, and comprises a frame structure composed of a plurality of transverse beams and a plurality of longitudinal beams;

[0019] The bottom surfaces of the plurality of steel bottom plate structures are respectively fixedly connected to the steel plate beam structure;

[0020] Each of the steel bottom plate structures is provided with a shear key, and a shear key welding bridge is provided between two adjacent shear keys in different rows;

[0021] The reinforced concrete layer is laid on the steel base plate structure.

[0022] The present application proposes a steel base plate structure for a bridge deck, which is formed by bending the periphery of the steel base plate downward to form a steel base plate body and a supporting portion, and arranging a plurality of shear keys at equal intervals on the steel base plate body, thereby achieving low stress concentration in the steel base plate structure during assembly and welding, thereby improving construction efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram showing a steel bottom plate structure of a bridge deck in an exemplary embodiment of the present application;

[0025] Figure 2 A schematic diagram showing the bending of the steel bottom plate in an exemplary embodiment of the present application;

[0026] Figure 3 A schematic structural diagram of a steel-concrete composite bridge deck in an exemplary embodiment of the present application is shown.

[0027] In the figure, 100, steel base plate structure; 110, steel base plate; 111, steel base plate body; 112, support part; 1121, long side support; 1122, short side support; 1123, gap; 113, bending line; 120, shear key; 121, opening; 200, steel-concrete composite bridge panel; 210, bridge main truss; 220, steel plate beam structure; 221, cross beam; 222, longitudinal beam; 230, shear key welding bridge position. DETAILED DESCRIPTION

[0028] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0029] In addition, the drawings are only schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and their repeated descriptions will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0030] In a first aspect, this exemplary embodiment provides a steel bottom plate structure 100 of a bridge deck, such as Figure 1 As shown, it includes: a steel base plate 110 and a plurality of shear keys 120.

[0031] The periphery of the steel bottom plate 110 is bent downward to form a steel bottom plate body 111 and a support portion 112, and the support portion 112 keeps the surface of the steel bottom plate body 111 horizontal;

[0032] A plurality of shear keys 120 are arranged in sequence and at equal intervals on the surface of the steel bottom plate body 111 along the longitudinal bridge direction.

[0033] The embodiment of the present application proposes a steel base plate structure 100 for a bridge deck. By bending the periphery of the steel base plate 110 downward to form a steel base plate body 111 and a support portion 112, and arranging a plurality of shear keys 120 at equal intervals on the steel base plate body 111, low stress concentration can be achieved in the steel base plate structure 100 during assembly and welding, thereby improving construction efficiency and quality.

[0034] Below, this exemplary embodiment will be described in more detail.

[0035] In one embodiment, Figure 2 As shown, the steel bottom plate 110 is designed to be rectangular, and a bending line 113 is provided near the edge line of each side of the steel bottom plate 110, and the bending lines 113 on two opposite sides of the steel bottom plate 110 are parallel to each other. The steel bottom plate 110 is bent downward along each bending line 113 to form an upper steel bottom plate body 111 and a lower support portion 112. After bending, the lower support portion 112 keeps the surface of the upper steel bottom plate body 111 horizontal.

[0036] Furthermore, the support portion 112 formed after bending is specifically defined. The support portion 112 includes two opposite long side supports 1121 and two opposite short side supports 1122, and the two long side supports 1121 and the two short side supports 1122 keep the steel base plate body 111 horizontal. The formed support portion 112 is used to keep the steel base plate body 111 horizontal and form a stable support, which is conducive to pouring concrete on the steel base plate body 111 later, and the design of the support portion 112 realizes low stress concentration of the steel base plate structure 100 during assembly and welding, thereby improving construction efficiency and quality.

[0037] Furthermore, the present embodiment limits the bending angle to be between 0° and 90°, i.e., greater than 0° and less than 90°. The support portion 112 formed in this way provides a more stable support for the steel base plate body 111. If the bending angle is greater than 90°, the support portion 112 will become unstable.

[0038] Furthermore, there is a gap 1123 at the connection between each long side support 1121 and the short side support 1122, that is, the connection is cut off, and the stress concentration position at the connection between each long side support 1121 and the short side support 1122 is subjected to arc transition processing, so as to ensure that a certain gap 1123 is reserved after bending, thereby avoiding the sharp corner position from affecting the bending process.

[0039] In this embodiment, the steel base plate 110 is processed using a pre-prepared bending mold. The steel base plate 110 is firstly bent at two opposite long sides on a bending machine, and then at two opposite short sides.

[0040] In this embodiment, before bending the steel bottom plate 110, the steel bottom plate 110 needs to be pre-treated. The pre-treatment includes shot peening, roller pressing and other treatments on the steel bottom plate 110, which can improve the fatigue strength of the surface of the steel bottom plate 110, improve the overall flatness accuracy of the steel bottom plate 110, and reduce the number of correction processes.

[0041] In one embodiment, the shear key 120 used in this embodiment is preferably a PBL shear key 120. The structure of each PBL shear key 120 is the same, and each PBL shear key 120 includes openings 121 arranged at equal intervals; after all PBL shear keys 120 and the steel base plate body 111 are welded, the cross bridge is upward, and the centers of the openings 121 at the same position on all PBL shear keys 120 are on the same horizontal line.

[0042] In this embodiment, the steel base plate 110 is precisely cut by numerical control technology, and a plurality of position lines are marked at corresponding positions of the steel base plate body 111 , and then a plurality of PBL shear keys 120 are assembled.

[0043] In this embodiment, the PBL shear key 120 is precisely cut by a gantry cutting machine or an automatic trolley, and the openings 121 on each PBL shear key 120 are punched by a punching machine, and the size spacing of each opening 121 is strictly controlled during punching. The centers of the openings 121 at the same position on all PBL shear keys 120 are on the same horizontal line to ensure smooth passage of the perforated steel bars in the later stage.

[0044] In this embodiment, the assembly and welding sequence of the plurality of PBL shear keys 120 is: assembly and welding from the middle to both sides, or assembly and welding from one side to the other side.

[0045] In this embodiment, intermittent double-sided welding of fillet welds is adopted, and the shear key 120 and the steel bottom plate body 111 are welded from the middle to both sides, so that free contraction can be achieved and stress concentration can be avoided. When welding, small diameter welding rods or welding wires should be used as much as possible according to the specific conditions of the weldment, and a smaller heat input should be selected to reduce the heat range of the weldment, thereby reducing welding stress.

[0046] Furthermore, the lengths of all the PBL shear keys 120 are greater than the width of the steel base plate body 111 , and both ends of each PBL shear key 120 extend out of the steel base plate body 111 .

[0047] It should be noted that, in this embodiment, the lower surface of the steel bottom plate body 111 needs to be sandblasted and rust-removed, and then painted according to the coating system of its outer surface. The upper surface of the steel bottom plate 110 and the plurality of PBL shear keys 120 do not need to be sandblasted and painted.

[0048] Furthermore, in this embodiment, the butt gap of each PBL shear key 120 is in the range of 4-25 mm, and the radius of the opening 121 is in the range of 5-30 mm.

[0049] A second aspect of this exemplary embodiment provides a steel-concrete composite bridge panel 200, such as Figure 3 As shown, the steel-concrete composite bridge panel 200 includes the steel bottom plate structure 100 of the above-mentioned bridge panel, as well as a bridge main truss 210, a steel plate beam structure 220 and a reinforced concrete layer;

[0050] The steel plate beam structure 220 is disposed between two vertically parallel bridge main girders 210 and includes a frame structure composed of a plurality of transverse beams 221 and a plurality of longitudinal beams 222;

[0051] The bottom surfaces of the multiple steel floor structures 100 are respectively fixedly connected to the steel plate beam structure 220;

[0052] Each steel bottom plate structure 100 is provided with a shear key 120, and a shear key welding bridge 230 is provided between two adjacent shear keys 120 in different rows;

[0053] The reinforced concrete layer is laid on the steel base plate structure 100 .

[0054] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like in the above description indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0056] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0057] In the embodiments of the present application, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0059] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application.

Claims

1. A steel bottom plate structure of a bridge deck, characterized in that: include: A steel bottom plate, wherein the periphery of the steel bottom plate is bent downward to form a steel bottom plate body and a support portion, wherein the support portion keeps the surface of the steel bottom plate body horizontal; A plurality of shear keys, wherein the plurality of shear keys are arranged on the surface of the steel bottom plate body in sequence and at equal intervals along the longitudinal bridge direction; The steel bottom plate is rectangular, and a bending line is provided near the edge line of each side of the steel bottom plate, and the bending lines on two opposite sides of the steel bottom plate are parallel to each other; After bending, the support portion below keeps the surface of the steel bottom plate body above level; The support portion includes two opposite long side supports and two opposite short side supports, and the two long side supports and the two short side supports keep the steel bottom plate body horizontal; A gap is provided at the connection between each of the long side supports and the short side supports; The connection between the long side support and the short side support is provided with an arc transition; The shear key is a PBL shear key; The structure of each of the PBL shear keys is the same, and each of the PBL shear keys includes openings arranged at equal intervals; After the welding of all the PBL shear keys and the steel base plate body is completed, the cross bridge is upward, and the centers of the openings at the same position on all the PBL shear keys are on the same horizontal straight line; The butt gap of each PBL shear key is in the range of 4-25 mm; the radius of the opening is in the range of 5-30 mm.

2. The steel bottom plate structure of the bridge deck according to claim 1, characterized in that: The bending angle formed between the steel bottom plate body and the support portion is greater than 0° and less than 90°.

3. The steel bottom plate structure of the bridge deck according to claim 1, characterized in that: The lengths of all the PBL shear keys are greater than the width of the steel base plate body, and both ends of each of the PBL shear keys extend out of the steel base plate body.

4. A steel-concrete composite bridge panel, characterized in that: include: The steel bottom plate structure of the bridge deck as claimed in any one of claims 1 to 3, as well as the bridge main truss, steel plate beam structure and reinforced concrete layer; Wherein, the steel plate beam structure is arranged between two vertically arranged parallel main girders of the bridge, and comprises a frame structure composed of a plurality of transverse beams and a plurality of longitudinal beams; The bottom surfaces of the plurality of steel bottom plate structures are respectively fixedly connected to the steel plate beam structure; Each of the steel bottom plate structures is provided with a shear key, and a shear key welding bridge is provided between two adjacent shear keys in different rows; The reinforced concrete layer is laid on the steel base plate structure.

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