Steel-UHPC composite beam prefabricated bridge deck slab connecting structure

Abstract

The utility model relates to a steel-UHPC composite beam prefabricated bridge deck slab connecting structure, and belongs to the technical field of bridges. The connecting structure body comprises a steel main beam and a UHPC prefabricated bridge deck slab. The top surface of the steel girder is fixedly connected with the bottom surface of the UHPC prefabricated bridge deck slab; the axial direction of the steel main beam is orthogonal to the axial direction of the UHPC prefabricated bridge deck slab; a plurality of shearing force grooves are evenly distributed in the UHPC prefabricated bridge deck slab in the axial direction; every two adjacent UHPC prefabricated bridge deck slabs are arranged in parallel, and a wet joint is arranged between every two adjacent UHPC prefabricated bridge deck slabs. A plurality of cylindrical head welding nails are uniformly distributed in each shearing force groove; a plurality of groups of cylindrical head welding studs are uniformly distributed on the top surface of the steel main beam and in the wet joint; compared with a single shear surface of a traditional connecting structure, the composite shear surface can enhance the shear bearing capacity of the connecting structure; according to the T-shaped wet joint, the bearing capacity and the anti-cracking capacity of the wet joint can be greatly improved, and the bearing capacity and the service performance of the steel-concrete composite beam bridge are effectively improved.

Description

Technical Field

[0001] This utility model belongs to the field of bridge engineering technology, specifically relating to a precast bridge deck connection structure for steel-UHPC composite beams. Background Technology

[0002] Steel-concrete composite girder bridges fully utilize the excellent tensile strength of steel and the superior compressive strength of concrete, gaining widespread application in bridge engineering due to their technical and economic advantages. Ultra-high performance concrete (UHPC) possesses excellent tensile and compressive mechanical properties and durability. Compared to ordinary concrete bridge decks, UHPC bridge decks are thinner, lighter, and perform better, effectively solving the problem of cracking in traditional composite girder concrete bridge decks. Furthermore, the use of precast bridge decks maximizes the standardization, industrialization, and green construction of bridges. However, the connection structure of steel-concrete composite girder bridges, as a critical yet vulnerable link in precast bridge deck construction, directly affects the construction speed and operational performance of the bridge decks. Therefore, research on the connection structure of precast steel-UHPC composite girder bridge decks is particularly necessary.

[0003] Therefore, how to design a steel-concrete composite beam bridge deck and inter-slab connection structure to improve its performance and significantly enhance the service performance of the steel-concrete composite beam bridge has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies and provide a precast bridge deck connection structure for steel-UHPC composite beams.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A steel-UHPC composite beam precast bridge deck connection structure includes a steel main beam 1 and a UHPC precast bridge deck 2;

[0007] The top surface of the steel main beam 1 is fixedly connected to the bottom surface of the UHPC precast bridge deck 2;

[0008] The axial direction of the steel main beam 1 is orthogonal to the axial direction of the UHPC precast bridge deck 2;

[0009] On the UHPC precast bridge deck 2, multiple shear grooves 4 are evenly distributed along the axial direction;

[0010] Two adjacent UHPC prefabricated bridge panels 2 are arranged in parallel, and a wet joint 3 is provided between two adjacent UHPC prefabricated bridge panels 2.

[0011] In each shear groove 4, multiple cylindrical head weld studs 5 are evenly distributed; the bottom of the cylindrical head weld studs 5 is fixedly connected to the top surface of the steel main beam 1.

[0012] On the top surface of the steel main beam 1, and in the wet joint 3, multiple sets of cylindrical head weld studs 5 are evenly distributed; each set of cylindrical head weld studs 5 consists of multiple cylindrical head weld studs 5.

[0013] Furthermore, preferably, the wet joint 3 is a T-shaped wet joint.

[0014] Furthermore, preferably, the shear groove 4 is a T-shaped shear groove.

[0015] Furthermore, preferably, three shear grooves 4 are evenly distributed along the axial direction on the UHPC precast bridge deck 2.

[0016] Furthermore, preferably, four cylindrical head welding studs 5 are evenly distributed in each shear groove 4.

[0017] Furthermore, preferably, three sets of cylindrical head weld studs 5 are evenly distributed on the top surface of the steel main beam 1 and in the wet joint 3; each set of cylindrical head weld studs 5 consists of four cylindrical head weld studs 5.

[0018] Furthermore, preferably, a pressure strip 6 is installed on the top surface of the steel main beam 1 and on both sides of the bottom of the UHPC precast bridge deck 2; the pressure strip 6 is a bentonite rubber rainwater-swellable waterstop strip.

[0019] The axial direction of the pressure strip 6 is parallel to the axial direction of the main steel beam 1.

[0020] This invention uses shear grooves and cylindrical head welding studs to tightly connect the UHPC precast bridge deck and the steel main beam, and achieves longitudinal connection between UHPC precast bridge decks through wet joints.

[0021] Preferably, the cylindrical head weld studs are welded to the designated positions on the steel main beam in the field.

[0022] This invention preferably employs a T-shaped shear groove structure, which is beneficial for improving the steel-concrete interface connection performance of the steel-UHPC composite beam. Simultaneously, it enhances the strength and stiffness of the connection points in the composite beam. Compared to the traditional single-shear-plane shear groove design, the composite shear plane formed by the T-shaped shear groove effectively improves the stability and integrity of the connection between the UHPC precast bridge deck and the steel main beam.

[0023] The present invention preferably adopts a T-shaped wet joint structure, which enhances the joint strength of the precast slab connection.

[0024] The present invention preferably uses a 10mm thick BW-S120 type bentonite rubber rainwater-swellable sealing strip as the pressure strip, and its technical indicators should comply with the provisions of "Bentonite Rubber Water-Swellable Sealing Strip" (JG / T 141-2001).

[0025] Compared with the prior art, the advantages of this utility model are as follows:

[0026] This utility model provides a steel-UHPC composite beam precast bridge deck connection structure, which can enhance the shear bearing capacity of the connection structure; specifically, the composite shear surface of the connection structure (composed of shear groove, cylindrical head weld stud, wet joint and steel bars in the UHPC precast bridge deck) can enhance the shear bearing capacity of the connection structure compared with the single shear surface of the traditional connection structure.

[0027] The T-shaped wet joint adopted in this invention can significantly improve the load-bearing capacity and crack resistance of the wet joint, effectively enhancing the load-bearing capacity and service performance of steel-concrete composite beam bridges.

[0028] This invention has a very good prospect for promotion and application in the design and construction of steel-concrete composite beam bridges. While meeting the requirements of prefabricated construction, it can also ensure that the connection structure has excellent performance, and its competitive advantage is obvious. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a three-dimensional schematic diagram of the precast bridge deck connection structure of the steel-UHPC composite beam of this utility model;

[0031] Figure 2 This is a three-dimensional sectional view of the precast bridge deck connection structure of the steel-UHPC composite beam of this utility model;

[0032] The components include: 1. Steel main beam; 2. UHPC precast bridge deck; 3. Wet joint; 4. Shear groove; 5. Cylindrical head weld stud; 6. Pressure strip. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the embodiments.

[0034] Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be construed as limiting the scope of the present invention. Where specific techniques, connections, or conditions are not specified in the embodiments, they are performed in accordance with the techniques, connections, or conditions described in the literature in the field or according to the product instructions. Materials, instruments, or equipment used without specified manufacturers are all conventional products that can be obtained through purchase.

[0035] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” to another element, it can be directly connected to the other element, or there may be intermediate elements. The term “and / or” as used herein includes any unit and all combinations of one or more associated listed items.

[0036] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. The terms "inner", "upper", "lower", etc., indicate the orientation or state relationship based on the orientation or state relationship shown in the drawings, and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "equipped with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein. Example 1

[0039] like Figure 1 and Figure 2 As shown, a steel-UHPC composite beam precast bridge deck connection structure includes a steel main beam 1 and a UHPC precast bridge deck 2.

[0040] The top surface of the steel main beam 1 is fixedly connected to the bottom surface of the UHPC precast bridge deck 2;

[0041] The axial direction of the steel main beam 1 is orthogonal to the axial direction of the UHPC precast bridge deck 2;

[0042] On the UHPC precast bridge deck 2, multiple shear grooves 4 are evenly distributed along the axial direction;

[0043] Two adjacent UHPC prefabricated bridge panels 2 are arranged in parallel, and a wet joint 3 is provided between two adjacent UHPC prefabricated bridge panels 2.

[0044] In each shear groove 4, multiple cylindrical head weld studs 5 are evenly distributed; the bottom of the cylindrical head weld studs 5 is fixedly connected to the top surface of the steel main beam 1.

[0045] On the top surface of the steel main beam 1, and in the wet joint 3, multiple sets of cylindrical head weld studs 5 are evenly distributed; each set of cylindrical head weld studs 5 consists of multiple cylindrical head weld studs 5. Example 2

[0046] like Figure 1 and Figure 2 As shown, a steel-UHPC composite beam precast bridge deck connection structure includes a steel main beam 1 and a UHPC precast bridge deck 2.

[0047] The top surface of the steel main beam 1 is fixedly connected to the bottom surface of the UHPC precast bridge deck 2;

[0048] The axial direction of the steel main beam 1 is orthogonal to the axial direction of the UHPC precast bridge deck 2;

[0049] On the UHPC precast bridge deck 2, multiple shear grooves 4 are evenly distributed along the axial direction;

[0050] Two adjacent UHPC prefabricated bridge panels 2 are arranged in parallel, and a wet joint 3 is provided between two adjacent UHPC prefabricated bridge panels 2.

[0051] In each shear groove 4, multiple cylindrical head weld studs 5 are evenly distributed; the bottom of the cylindrical head weld studs 5 is fixedly connected to the top surface of the steel main beam 1.

[0052] On the top surface of the steel main beam 1, and in the wet joint 3, multiple sets of cylindrical head weld studs 5 are evenly distributed; each set of cylindrical head weld studs 5 consists of multiple cylindrical head weld studs 5.

[0053] On the top surface of the main steel beam 1, and in the wet joint 3, three sets of cylindrical head weld studs 5 are evenly distributed; each set of cylindrical head weld studs 5 consists of four cylindrical head weld studs 5.

[0054] A pressure strip 6 is installed on the top surface of the steel main beam 1 and on both sides of the bottom of the UHPC precast bridge deck 2. The pressure strip 6 is a 10mm thick BW-S120 type bentonite rubber rainwater-swellable waterstop strip, and its technical indicators should comply with the provisions of "Bentonite Rubber Water-Swellable Waterstop Strip" (JG / T 141-2001).

[0055] The axial direction of the pressure strip 6 is parallel to the axial direction of the main steel beam 1. Example 3

[0056] like Figure 1 and Figure 2 As shown, a steel-UHPC composite beam precast bridge deck connection structure includes a steel main beam 1 and a UHPC precast bridge deck 2.

[0057] The top surface of the steel main beam 1 is fixedly connected to the bottom surface of the UHPC precast bridge deck 2;

[0058] The axial direction of the steel main beam 1 is orthogonal to the axial direction of the UHPC precast bridge deck 2;

[0059] On the UHPC precast bridge deck 2, multiple shear grooves 4 are evenly distributed along the axial direction;

[0060] Two adjacent UHPC prefabricated bridge panels 2 are arranged in parallel, and a wet joint 3 is provided between two adjacent UHPC prefabricated bridge panels 2.

[0061] In each shear groove 4, multiple cylindrical head weld studs 5 are evenly distributed; the bottom of the cylindrical head weld studs 5 is fixedly connected to the top surface of the steel main beam 1.

[0062] On the top surface of the steel main beam 1, and in the wet joint 3, multiple sets of cylindrical head weld studs 5 are evenly distributed; each set of cylindrical head weld studs 5 consists of multiple cylindrical head weld studs 5.

[0063] Wet joint 3 is a T-shaped wet joint.

[0064] Shear groove 4 is a T-shaped shear groove.

[0065] Three shear grooves 4 are evenly distributed along the axial direction on the UHPC precast bridge deck 2.

[0066] In each shear groove 4, four cylindrical head welding studs 5 are evenly distributed.

[0067] On the top surface of the main steel beam 1, and in the wet joint 3, three sets of cylindrical head weld studs 5 are evenly distributed; each set of cylindrical head weld studs 5 consists of four cylindrical head weld studs 5.

[0068] A pressure strip 6 is installed on the top surface of the steel main beam 1 and on both sides of the bottom of the UHPC precast bridge deck 2. The pressure strip 6 is a 10mm thick BW-S120 type bentonite rubber rainwater-swellable waterstop strip, and its technical indicators should comply with the provisions of "Bentonite Rubber Water-Swellable Waterstop Strip" (JG / T 141-2001).

[0069] The axial direction of the pressure strip 6 is parallel to the axial direction of the main steel beam 1.

[0070] Cylindrical head welding studs 5 are used to connect the steel main beam 1 and the UHPC precast bridge deck 2;

[0071] The T-shaped shear groove 4 is used to enhance the shear strength of the newly poured UHPC ultra-high performance concrete and the UHPC precast bridge deck 2.

[0072] T-shaped wet joint 3 is used to enhance the connection strength of wet joints between UHPC precast bridge decks 2;

[0073] The pressure strip 6 is installed to ensure waterproof sealing of the steel-concrete interface and prevent grout leakage during concrete pouring. After the pressure strip 6 expands when exposed to water, it can completely seal the UHPC precast bridge deck 2 with the steel main beam 1, and the lower side opening of the shear groove 4 is completely sealed by the pressure strip 6 after it expands when exposed to water, thus ensuring no grout leakage.

[0074] During construction, the cylindrical head welding studs 5 are first welded on-site to the steel main beam 1 according to the above technical plan, ensuring welding quality. Then, the UHPC precast bridge deck 2 is installed onto the steel main beam 1. Afterward, UHPC micro-expansion concrete filler (purchased from Hunan Zhonglu Huacheng Bridge Technology Co., Ltd., which includes UHPC and concrete expansion agent, with a concrete expansion agent dosage of 1.5%, conforming to the requirements of GB / T 23439-2017) is poured into the wet joint 3 and shear groove 4. Using this product, the poured UHPC micro-expansion concrete filler exhibits a micro-expansion effect, thereby generating a certain pre-compression under the constraint of the UHPC precast bridge deck 2, which can offset some shrinkage strain and tensile force, preventing premature cracking. Before pouring, the UHPC precast bridge deck 2 is preferably roughened to enhance the bond between the old and new concrete. After pouring, it is preferable to use 80℃ high-temperature steam curing for 72 hours to prevent early shrinkage cracks in the UHPC ultra-high performance concrete. After curing, the precast bridge deck connection structure of the steel-UHPC composite beam is pushed to the bridge's designed position.

[0075] The precast bridge deck connection structure of the steel-UHPC composite beam of this utility model has a reasonable connection stress, excellent service performance, convenient and efficient construction, and is safe and reliable. It can be applied to the design and construction of steel-UHPC concrete composite beam bridges.

[0076] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A precast bridge deck connection structure for steel-UHPC composite beams, characterized in that, It includes a steel main beam (1) and a UHPC precast bridge deck (2); The top surface of the steel main beam (1) and the bottom surface of the UHPC precast bridge deck (2) are fixedly connected; The axial direction of the steel main beam (1) is orthogonal to the axial direction of the UHPC precast bridge deck (2); On the UHPC precast bridge deck (2), multiple shear grooves (4) are evenly distributed along the axial direction. Two adjacent UHPC precast bridge panels (2) are arranged in parallel, and a wet joint (3) is provided between two adjacent UHPC precast bridge panels (2). In each shear groove (4), multiple cylindrical head weld studs (5) are evenly distributed; the bottom of the cylindrical head weld studs (5) is fixedly connected to the top surface of the steel main beam (1); On the top surface of the steel main beam (1) and in the wet joint (3), multiple sets of cylindrical head weld studs (5) are evenly distributed; each set of cylindrical head weld studs (5) consists of multiple cylindrical head weld studs (5).

2. The precast bridge deck connection structure of the steel-UHPC composite beam according to claim 1, characterized in that, The wet joint (3) is a T-shaped wet joint.

3. The precast bridge deck connection structure of the steel-UHPC composite beam according to claim 1, characterized in that, The shear groove (4) is a T-shaped shear groove.

4. The precast bridge deck connection structure of the steel-UHPC composite beam according to claim 1, characterized in that, Three shear grooves (4) are evenly distributed along the axial direction on the UHPC precast bridge deck (2).

5. The precast bridge deck connection structure of the steel-UHPC composite beam according to claim 1, characterized in that, In each shear groove (4), four cylindrical head welding studs (5) are evenly distributed.

6. The precast bridge deck connection structure of the steel-UHPC composite beam according to claim 1, characterized in that, On the top surface of the main steel beam (1) and in the wet joint (3), three sets of cylindrical head weld studs (5) are evenly distributed; each set of cylindrical head weld studs (5) consists of four cylindrical head weld studs (5).

7. The precast bridge deck connection structure of the steel-UHPC composite beam according to claim 1, characterized in that, A pressure strip (6) is installed on the top surface of the steel main beam (1) and on both sides of the bottom of the UHPC precast bridge deck (2); the pressure strip (6) is a bentonite rubber rainwater expansion waterstop strip; The axial direction of the pressure strip (6) is parallel to the axial direction of the steel main beam (1).

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