A flat thin steel plate bottom mold joint bonding connection structure of a composite bridge deck

Abstract

The application discloses a plane thin steel plate bottom die jointing glue joint connecting structure of a combined bridge deck slab, which comprises an epoxy glue layer, which is coated on the upper surface of the joint position of adjacent plane thin steel plate bottom dies; and a steel plate, which is pasted on the upper part of the epoxy glue layer. The plane thin steel plate bottom dies pre-fabricated in sections in a factory can be spliced into a whole at a construction site, the joint position of adjacent plane thin steel plate bottom dies is connected through the coating of the epoxy glue and the pasting of the steel plate, and the connecting process is simple and the force transmission at the joint is reliable.

Description

Technical Field

[0001] This application relates to the field of bridge engineering technology, and in particular to a planar thin steel plate bottom formwork joint adhesive connection structure for composite bridge decks. Background Technology

[0002] Composite beam bridges with flat thin steel plate bottom formwork are an important innovation in the development of bridge composite structures in recent years. This structure uses flat thin steel plate bottom formwork to replace the wooden formwork that needs to be erected when pouring concrete for traditional composite bridge decks. The flat thin steel plate bottom formwork can be welded to the upper edge of the steel beam, and it is combined with the concrete bridge deck through stiffening ribs and weld studs arranged on the upper flange of the steel beam.

[0003] Considering the limitations of fabrication site and transportation conditions for thin steel plate formwork, a segmented prefabrication method is adopted, followed by on-site connection between segments. Currently, thin steel plate formwork segments are mostly connected by electric welding. However, due to the thinness of the steel plates used in the formwork, welding operations can easily cause deformation of the steel plates, affecting construction quality. Furthermore, improper welding at the joints can easily generate initial stress, which, when combined with unfavorable stress during concrete pouring, can also easily cause deformation of the steel formwork. Therefore, traditional welding connection techniques place high demands on the welding skills of workers, and construction remains relatively difficult. Utility Model Content

[0004] Embodiments of this application provide a planar thin steel plate bottom mold joint adhesive connection structure for composite bridge decks.

[0005] To achieve the above objectives, embodiments of this application provide a planar thin steel plate bottom formwork joint adhesive bonding structure for composite bridge decks, comprising:

[0006] An epoxy adhesive layer is applied to the upper surface of the joint between adjacent thin steel plate bottom molds.

[0007] The steel plate is adhered to the top of the epoxy adhesive layer.

[0008] In one embodiment, the adhesive bonding structure for the bottom formwork joint of the composite bridge deck's thin steel plate further includes:

[0009] Vertical stiffening ribs are welded to the upper surface of the flat thin steel plate bottom mold; several round holes are equally spaced in the middle of the vertical stiffening ribs; several first PZ openings and second PZ openings are opened on the upper edge of the vertical stiffening ribs away from the flat thin steel plate bottom mold.

[0010] The vertical stiffening ribs are installed in the same direction as the steel plate.

[0011] In one embodiment, the adhesive bonding structure for the bottom formwork joint of the composite bridge deck's thin steel plate further includes:

[0012] The first longitudinal reinforcement and the second longitudinal reinforcement are both set perpendicular to the vertical stiffeners;

[0013] The first longitudinal reinforcement bar is placed at the first PZ opening;

[0014] The second longitudinal steel bar is welded to the vertical stiffening rib at the second PZ opening.

[0015] In one embodiment, the transverse bridge spacing between adjacent second PZ ports is 900 mm.

[0016] In one embodiment, two adjacent second longitudinal bars along the second longitudinal bar axis are connected by single-sided welding.

[0017] In one embodiment, the weld connection length of the two second longitudinal reinforcing bars welded on one side is 10 times the diameter of the second longitudinal reinforcing bars.

[0018] In one embodiment, two first longitudinal bars that are axially adjacent along the first longitudinal bar are connected by tying.

[0019] In one embodiment, the lap length of the two first longitudinal reinforcing bars that are tied together is 20 times the diameter of the first longitudinal reinforcing bars.

[0020] In one embodiment, the adhesive bonding structure for the bottom formwork joint of the composite bridge deck's thin steel plate further includes:

[0021] The transverse reinforcement is perpendicular to the first longitudinal reinforcement and the second longitudinal reinforcement.

[0022] The transverse reinforcement bars are connected to the first longitudinal reinforcement bars and the second longitudinal reinforcement bars by tying.

[0023] In one embodiment, the epoxy adhesive layer is 1 mm thick, and the epoxy adhesive layer on each flat thin steel plate bottom mold is 50 mm wide.

[0024] The steel plate is 3mm thick and 100mm wide.

[0025] This application has the following advantages over the prior art:

[0026] This solution allows prefabricated thin steel plate formwork sections to be assembled into a single unit on the construction site. The joints between adjacent thin steel plate formwork sections are connected by applying epoxy adhesive and attaching strip steel plates. The connection process is simple and the force transmission at the joints is reliable. This effectively solves the problem of weak stress at the joints of composite beams with thin steel plate formwork in current engineering projects, and is conducive to the promotion and use of composite beam bridges with thin steel plate formwork. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the adhesive bonding structure for the bottom formwork joint of the composite bridge deck in an embodiment of this application. Figure 1 ;

[0029] Figure 2 This is a schematic diagram of the adhesive bonding structure for the bottom formwork joint of the composite bridge deck in an embodiment of this application. Figure 2 ;

[0030] Figure 3 This is a schematic diagram of the adhesive bonding structure for the bottom formwork joint of the composite bridge deck in an embodiment of this application. Figure 3 ;

[0031] Figure 4 This is a schematic diagram of the adhesive bonding structure for the bottom formwork joint of the composite bridge deck in an embodiment of this application. Figure 4 ;

[0032] Figure 5 This is a schematic diagram showing the implementation of the adhesive bonding structure for the bottom mold joint of the combined bridge deck in this application embodiment. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "joining" should be interpreted broadly, for example, they can refer to fixed connection, detachable connection, or integral connection; for those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0037] like Figure 1 , Figure 2 As shown, this application discloses a planar thin steel plate bottom formwork joint adhesive bonding structure for composite bridge decks, applicable to composite bridge decks with planar thin steel plate bottom formwork. This planar thin steel plate bottom formwork joint adhesive bonding structure comprises three parts: the connection structure of the planar thin steel plate bottom formwork, the connection structure of the reinforcing bars, and the concrete bridge deck structure. During construction, the planar thin steel plate bottom formwork is connected first, followed by the connection of the reinforcing bars, and finally the concrete for the bridge deck is poured.

[0038] Reference Figure 1 , Figure 2 The embodiments of this application provide a planar thin steel plate bottom formwork joint adhesive connection structure for composite bridge decks, comprising:

[0039] Epoxy adhesive layer 1 is applied to the upper surface of the joint between adjacent flat thin steel plate bottom molds 3;

[0040] Steel plate 2 is attached to the upper part of epoxy adhesive layer 1.

[0041] Specifically, two adjacent thin steel plate bottom molds 3 are aligned and pressed together. Epoxy adhesive is applied to the upper surface of the joint between the two thin steel plate bottom molds 3. The thickness and width of the epoxy adhesive can be set according to actual needs. Optionally, the thickness of the epoxy adhesive layer 1 is 1mm, and the width of the epoxy adhesive layer 1 on each thin steel plate bottom mold 3 is 50mm.

[0042] A steel plate 2 is pasted onto the epoxy adhesive layer 1. The thickness and width of the steel plate 2 can be set according to actual needs. Optionally, the thickness of the steel plate 2 is 3mm and the width of the steel plate 2 is 100mm.

[0043] exist Figure 1 and Figure 2 The epoxy adhesive layer 1 and the steel plate 2 have the same width; therefore, the steel plate 2 will completely cover the epoxy adhesive layer 1. Figure 2Only steel plate 2 is shown in the image. Figure 1 The middle section shows the area without a steel plate.

[0044] The composite bridge deck planar thin steel plate bottom formwork joint adhesive connection structure provided in this embodiment allows the prefabricated planar thin steel plate bottom formwork in the factory to be assembled into a whole on the construction site. The joints of adjacent planar thin steel plate bottom formwork are connected by applying epoxy adhesive and pasting strip steel plates. The connection process is simple and the force transmission at the joints is reliable. It effectively solves the problem of weak stress at the joints of the steel bottom plate of the composite beam with thin steel plate bottom formwork in current engineering projects, which is conducive to the promotion and use of composite beam bridges with thin steel plate bottom formwork.

[0045] In one embodiment, reference continues to be made to Figure 1 and Figure 2 The adhesive bonding structure for the joint of the flat thin steel plate bottom formwork of the composite bridge deck also includes:

[0046] Vertical stiffening rib 4 is welded to the upper surface of the flat thin steel plate bottom mold 3; several round holes 41 are equally spaced in the middle of the vertical stiffening rib 4; several first PZ openings 42 and second PZ openings 43 are opened on the upper edge of the vertical stiffening rib 4 away from the flat thin steel plate bottom mold 3.

[0047] The vertical stiffening rib 4 is set in the same direction as the steel plate 2.

[0048] Specifically, several vertical stiffening ribs 4 are welded parallel to each other on the flat thin steel plate bottom mold 3. The diameter and spacing of the round holes 41 opened on the vertical stiffening ribs 4 can be set according to actual needs. For example, the diameter of the round holes 41 is 50mm and the spacing is 200mm.

[0049] By opening round holes 41 and PZ openings (including the first PZ opening 42 and the second PZ opening 43) on the vertical stiffening ribs 4, it can not only resist the deformation of the flat thin steel plate bottom mold 3 during the concrete pouring process, but also serve as a PBL connector to strengthen the bond between steel and concrete.

[0050] The first PZ port 42 and the second PZ port 43 have the same dimensions, but they are connected to the longitudinal steel bars in different ways. Based on the different connection methods, the longitudinal steel bars are divided into the first longitudinal steel bar 5 and the second longitudinal steel bar 6.

[0051] In one embodiment, such as Figure 3 As shown, the adhesive bonding structure for the joint of the planar thin steel plate bottom formwork of the composite bridge deck also includes:

[0052] The first longitudinal reinforcement 5 and the second longitudinal reinforcement 6 are both set perpendicular to the vertical stiffening rib 4.

[0053] The first longitudinal reinforcing bar 5 is placed at the first PZ opening 42;

[0054] The second longitudinal steel bar 6 is welded to the vertical stiffening rib 4 at the second PZ opening 43.

[0055] The transverse bridge spacing between adjacent second PZ ports 43 is 900mm.

[0056] Two adjacent second longitudinal reinforcing bars 6 along the axial direction are connected by single-sided welding. The weld length of the two single-sided welded second longitudinal reinforcing bars 6 is 10 times the diameter of the second longitudinal reinforcing bar 6.

[0057] Two adjacent first longitudinal reinforcing bars 5 along the axial direction are connected by tying. The lap length of the two tied first longitudinal reinforcing bars 5 is 20 times the diameter of the first longitudinal reinforcing bar 5.

[0058] Specifically, the rebar connection structure is divided into two types based on the connection method between the longitudinal rebar and the vertical stiffening rib 4 on the flat thin steel plate bottom formwork 3. The upper edge of the vertical stiffening rib 4 is provided with a first PZ opening 42 and a second PZ opening 43. A first longitudinal rebar 5 is placed in each first PZ opening 42, and a second longitudinal rebar 6 is placed in each second PZ opening 43. The first longitudinal rebar 5 is placed directly in the first PZ opening 42 without being connected to the vertical stiffening rib 4, while the second longitudinal rebar 6 is placed in the second PZ opening 43 and welded to the vertical stiffening rib 4.

[0059] The transverse bridge spacing between adjacent first PZ ports 42 and either first PZ ports 42 or second PZ ports 43 is equal and can be set according to actual needs. The transverse bridge spacing between adjacent second PZ ports 43 can also be set according to actual needs. For example, the transverse bridge spacing between adjacent first PZ ports 42 and either first PZ ports 42 or second PZ ports 43 is 150mm, and the transverse bridge spacing between adjacent second PZ ports 43 is 900mm.

[0060] For the second longitudinal steel bar 6 welded to the vertical stiffener 4, the two adjacent second longitudinal steel bars 6 need to be connected by single-sided welding at the joint, and the weld connection length is 10 times the diameter of the second longitudinal steel bar 6. For the first longitudinal steel bar 5 not welded to the vertical stiffener 4, the two adjacent first longitudinal steel bars 5 are tied at the joint, and the lap length of the two first longitudinal steel bars 5 is 20 times the diameter of the first longitudinal steel bar 5.

[0061] In one embodiment, such as Figure 4 As shown, the adhesive bonding structure for the joint of the planar thin steel plate bottom formwork of the composite bridge deck also includes:

[0062] Transverse reinforcement 7 is set perpendicularly to the first longitudinal reinforcement 5 and the second longitudinal reinforcement 6.

[0063] The transverse reinforcement 7 is connected to the first longitudinal reinforcement 5 and the second longitudinal reinforcement 6 by binding.

[0064] Specifically, the transverse reinforcing bars 7 are arranged above the first longitudinal reinforcing bars 5 and the second longitudinal reinforcing bars 6, and are connected by steel wire binding. The spacing between adjacent transverse reinforcing bars 7 can be set according to actual needs. For example, the spacing between adjacent transverse reinforcing bars 7 is 100mm.

[0065] The concrete bridge deck is constructed by casting the concrete deck in one continuous pour, with continuous pouring at the joints. After pouring, it is vibrated and cured until the required strength is achieved, ensuring a tight bond between the segmented precast thin steel plate bottom formwork 3 and the entire concrete slab, allowing them to share the load. After pouring, as shown... Figure 5 As shown.

[0066] The composite bridge deck provided in this application has a planar thin steel plate bottom formwork joint adhesive connection structure. The joint is connected by epoxy adhesive and strip steel plate. Combined with the steel mesh welded to the vertical stiffening rib and the final integrally cast concrete slab, the various parts are tightly bonded, so that the segmented prefabricated composite bridge deck structure has a high degree of integrity.

[0067] The adhesive bonding structure for the joint of the planar thin steel plate bottom formwork of the composite bridge deck provided in this application has the following advantages compared with the traditional electric welding connection structure at the joint of the steel bottom formwork:

[0068] (1) Adhesive bonding at the joint avoids deformation of the flat thin steel plate bottom formwork that may be caused by workers’ spot welding operations, which can improve the construction quality.

[0069] (2) Adhesive strips of steel plates are pasted at the joints to ensure that the force transmission between adjacent thin steel plates at the joints is continuous and smooth, avoiding the situation where the initial stress inside the plate is caused by improper spot welding, making the connection more reliable.

[0070] (3) Adhesive bonding is easy to operate and can improve construction efficiency.

[0071] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A planar thin steel plate bottom die joint bonding connection structure of a composite bridge deck slab, characterized by, include: An epoxy adhesive layer (1) is applied to the upper surface of the joint between adjacent flat thin steel plate bottom molds (3); A steel plate (2) is attached to the upper part of the epoxy adhesive layer (1).

2. The adhesive bonding structure for the joint of the planar thin steel plate bottom mold of the composite bridge deck according to claim 1, characterized in that, Also includes: Vertical stiffening ribs (4) are welded to the upper surface of the flat thin steel plate bottom mold (3); a number of round holes (41) are equally spaced in the middle of the vertical stiffening ribs (4); a number of first PZ openings (42) and second PZ openings (43) are opened on the upper edge of the vertical stiffening ribs (4) away from the flat thin steel plate bottom mold (3); The vertical stiffening rib (4) is arranged in the same direction as the steel plate (2).

3. The adhesive bonding structure for the joint of the planar thin steel plate bottom mold of the composite bridge deck according to claim 2, characterized in that, Also includes: The first longitudinal steel bar (5) and the second longitudinal steel bar (6) are both arranged perpendicularly to the vertical stiffening rib (4); The first longitudinal steel bar (5) is placed at the first PZ opening (42); The second longitudinal steel bar (6) is welded to the vertical stiffening rib (4) at the second PZ opening (43).

4. The adhesive bonding structure for the joint of the planar thin steel plate bottom mold of the composite bridge deck according to claim 3, characterized in that, The transverse bridge spacing between adjacent second PZ ports (43) is 900 mm.

5. The adhesive bonding structure for the joint of the planar thin steel plate bottom mold of the composite bridge deck according to claim 3, characterized in that, Two adjacent second longitudinal steel bars (6) along the axial direction of the second longitudinal steel bar (6) are connected by single-sided welding.

6. The adhesive bonding structure for the joint of the planar thin steel plate bottom mold of the composite bridge deck according to claim 5, characterized in that, The weld connection length of the two second longitudinal steel bars (6) welded on one side is 10 times the diameter of the second longitudinal steel bar (6).

7. The adhesive bonding structure for the joint of the planar thin steel plate bottom mold of the composite bridge deck according to claim 3, characterized in that, Two adjacent first longitudinal bars (5) along the first longitudinal bar (5) are connected by binding.

8. The adhesive bonding structure for the joint of the planar thin steel plate bottom mold of the composite bridge deck according to claim 7, characterized in that, The lap length of the two first longitudinal steel bars (5) that are tied together is 20 times the diameter of the first longitudinal steel bar (5).

9. The adhesive bonding structure for the joint of the planar thin steel plate bottom mold of the composite bridge deck according to claim 3, characterized in that, Also includes: A transverse reinforcing bar (7) is provided perpendicularly to the first longitudinal reinforcing bar (5) and the second longitudinal reinforcing bar (6); The transverse steel bar (7) is connected to the first longitudinal steel bar (5) and the second longitudinal steel bar (6) by binding.

10. The adhesive bonding structure for the joint of the planar thin steel plate bottom mold of the composite bridge deck according to any one of claims 1-9, characterized in that, The epoxy adhesive layer (1) has a thickness of 1 mm, and the epoxy adhesive layer (1) on each of the flat thin steel plate bottom molds (3) has a width of 50 mm; The steel plate (2) has a thickness of 3 mm and a width of 100 mm.

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