A novel abutment transition slab structure for a short-span seamless bridge

Abstract

This utility model discloses a novel small-span seamless bridge and a rear abutment transition slab structure, including a main beam, a support beam, a continuous fine aggregate concrete structure, a front slab, a rear slab, sleeper beams, a sliding layer, a plain concrete cushion layer, and a cement-stabilized crushed stone cushion layer. The main beam is fixedly connected to the middle of the support beam, and the front slab is connected to one side of the main beam. A continuous fine aggregate concrete structure is provided between the main beam and the front slab. The front slab and the rear slab are connected by tie rods. Sleeper beams are provided below both the front and rear slabs. A sliding layer is provided between the front slab and the sleeper beams, and a sliding layer is also provided between the rear slab and the sleeper beams. A plain concrete cushion layer is poured on the outside of the sleeper beams, and a cement-stabilized crushed stone cushion layer is fixedly provided below the plain concrete cushion layer, forming a longitudinally continuous structure of the main beam and slab, replacing the expansion joint structure, avoiding the vehicle bouncing problem at conventional expansion joints, and effectively improving vehicle driving comfort.

Description

Technical Field

[0001] This utility model relates to the field of small-span seamless bridge technology, specifically a novel small-span seamless bridge and a rear transition plate structure. Background Technology

[0002] With economic development and increasing traffic pressure, damage to bridge expansion joints has become increasingly serious, posing a significant challenge to bridge construction and maintenance. Traditional bridges with expansion joints not only reduce road smoothness and driving comfort during use, but also, because the expansion joints are constantly exposed on the bridge deck and directly bear the impact of vehicle loads, they are prone to damage, difficult to repair, and costly. Furthermore, the presence of expansion joints can lead to vehicle swaying at bridge approach, affecting traffic safety and reducing the overall performance of the bridge.

[0003] Currently, researchers both domestically and internationally are actively exploring new seamless bridge structural forms to address the shortcomings of existing technologies. For example, some studies have proposed a scheme of installing continuously reinforced concrete pavement at the ends of the approach slab to absorb structural deformation; other novel seamless expansion joints have also been proposed, such as connecting plates using ECC materials. However, these solutions often suffer from high engineering costs, complex construction, and limited material selection, making them difficult to promote in practical applications. Utility Model Content

[0004] The purpose of this utility model is to provide a novel small-span seamless bridge and a rear transition plate structure to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a novel small-span seamless bridge and a rear transition slab structure, comprising a main beam, a support beam, a continuous fine aggregate concrete structure, a front slab, a rear slab, sleeper beams, a sliding layer, a plain concrete cushion layer, and a cement-stabilized crushed stone cushion layer. The main beam is fixedly connected to the middle of the support beam, and the front slab is connected to one side of the main beam. A continuous fine aggregate concrete structure is provided between the main beam and the front slab. The front slab and the rear slab are connected by tie rods. Sleeper beams are provided below both the front and rear slabs. A sliding layer is provided between the front slab and the sleeper beams, and a sliding layer is also provided between the rear slab and the sleeper beams. A plain concrete cushion layer is poured on the outside of the sleeper beams, and a cement-stabilized crushed stone cushion layer is fixedly provided below the plain concrete cushion layer.

[0006] Preferably, a sliding layer is provided between the front slab and the support beam, an anchor bolt is installed through the support beam, and a steel sleeve is installed through the front slab, with the steel sleeve and the anchor bolt being connected in conjunction.

[0007] Preferably, the slip layer is a 2cm thick rubber pad, the anchor bolt has a penetration diameter of 25mm, the anchor bolt is an HRB400 steel bar, and the steel sleeve is Q235B steel with a wall thickness of 3mm and a diameter of 80mm.

[0008] Preferably, the tie rod is located at the center of the front and rear end plates, and the tie rod is a 16mm diameter HRB400 steel bar.

[0009] Preferably, the fine aggregate concrete continuous structure is C40 concrete.

[0010] Preferably, the plain concrete cushion layer is a 30cm C25 plain concrete cushion layer.

[0011] Preferably, the cement-stabilized crushed stone cushion layer is a 25cm thick 5% cement-stabilized crushed stone cushion layer.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: First, C40 fine aggregate concrete is used to fill the space between the main beam and the front approach slab, forming a longitudinally continuous structure that replaces the expansion joint, avoiding the vehicle bouncing problem at conventional expansion joints and effectively improving vehicle driving comfort. Second, two approach slabs are installed at the front and rear to gradually transition the pavement structure from the rigid abutment to the roadbed section behind the abutment. Two sleeper beams are installed under the front and rear approach slabs, and a sliding layer is installed between the sleeper beams and the approach slabs. This provides support without restricting the rotation and horizontal free deformation of the approach slabs. Through the above construction, an effective transition and connection between the rigid bridge and the flexible soil behind the abutment is achieved. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments 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.

[0014] Figure 1 This is an overall schematic diagram of a novel small-span seamless bridge and its rear transition slab structure in this embodiment; Figure 2 This is a schematic diagram of the sleeper beam structure of a novel small-span seamless bridge and a rear transition slab structure in this embodiment; Figure 3 This is a schematic diagram of the steel sleeve and anchor bolts that are prominent in the structure of a novel small-span seamless bridge and the transition plate behind the abutment in this embodiment.

[0015] The attached diagram lists the components represented by each number as follows: 1. Main beam; 2. Support beam; 3. Fine aggregate concrete continuous structure; 4. Front slab; 5. Rear slab; 6. Pillar beam; 7. Slip layer; 8. Plain concrete cushion layer; 9. Cement-stabilized crushed stone cushion layer; 10. Anchor bolt; 11. Steel sleeve; 12. Tie rod. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-3 This utility model provides a technical solution: a novel small-span seamless bridge and abutment transition slab structure, including a main beam 1, a support beam 2, a continuous fine stone concrete structure 3, a front slab 4, a rear slab 5, a sleeper beam 6, a sliding layer 7, a plain concrete cushion layer 8, and a cement-stabilized crushed stone cushion layer 9. The main beam 1 is fixedly connected to the middle of the support beam 2. The front slab 4 is connected to one side of the main beam 1. A continuous fine stone concrete structure 3 is provided between the main beam 1 and the front slab 4. The front slab 4 and the rear slab 5 are connected by tie rods 12. Sleeper beams 6 are provided below both the front slab 4 and the rear slab 5. A sliding layer 7 is provided between the front slab 4 and the sleeper beam 6. A sliding layer 7 is also provided between the rear slab 5 and the sleeper beam 6. A plain concrete cushion layer 8 is poured on the outside of the sleeper beam 6. A cement-stabilized crushed stone cushion layer 9 is fixedly provided below the plain concrete cushion layer 8.

[0018] Specifically, a sliding layer 7 is provided between the front slab 4 and the support beam 2, an anchor bolt 10 is installed through the support beam 2, and a steel sleeve 11 is installed through the front slab 4. The steel sleeve 11 is connected to the anchor bolt 10. Furthermore, the sliding layer 7 is a 2cm thick rubber pad, the anchor bolt 10 has a through diameter of 25mm, the anchor bolt 10 is an HRB400 steel bar, and the steel sleeve 11 is a Q235B steel with a wall thickness of 3mm and a diameter of 80mm. Through the above arrangement, the front slab 4 and the connection node of the platform back can have appropriate horizontal displacement (gap between the sleeve and the anchor bolt 10) and rotational freedom.

[0019] Specifically, tie rod 12 is set at the center of the front slab 4 and the rear slab 5. Tie rod 12 is made of HRB400 steel bar with a diameter of 16mm. Through the above arrangement, tie rod 12 is arranged at the center of the thickness of the front and rear slabs 5. This hinge structure ensures a suitable degree of rotational freedom of the connection node between the front and rear slabs 5 and ensures the continuity of the vertical displacement of the front and rear slabs 5.

[0020] Specifically, the fine aggregate concrete continuous structure 3 is made of C40 concrete. Through the above-mentioned design, the fine aggregate concrete continuous structure 3 has high strength and durability, and can withstand the stress caused by vehicle loads and temperature changes. At the same time, it ensures the smoothness and comfort of driving on the bridge deck. The fine aggregate concrete continuous structure 3 also has good impermeability and crack resistance, which can effectively prevent water from seeping into the bridge deck structure and extend the service life of the bridge.

[0021] Specifically, the plain concrete subbase 8 is a 30cm thick C25 plain concrete subbase, and further, the cement-stabilized crushed stone subbase 9 is a 25cm thick 5% cement-stabilized crushed stone subbase. Through the above arrangement, the following is achieved: The plain concrete cushion layer 8 and the cement-stabilized crushed stone cushion layer 9 together form a stable base structure, enhancing the load-bearing capacity and stability of the entire approach slab structure. The plain concrete cushion layer 8, as the part directly bearing the load transmitted by the bolster beam 6, has a thickness of 30cm and a strength grade of C25, ensuring sufficient rigidity and durability. The cement-stabilized crushed stone cushion layer 9, as a further reinforcement layer, has a thickness of 25cm and a cement content of 5%, giving it good water stability and deformation resistance. It can effectively resist deformation caused by foundation settlement and traffic loads, thus ensuring the long-term stability and safety of the approach slab structure.

[0022] A specific application example of this embodiment is as follows: When using this device, the first step is to conduct on-site surveys and design to ensure that the dimensions, positions, and material selection of the bridge and approach slab structures meet the actual requirements. During construction, the main beam 1 and support beam 2 are installed first. Then, a continuous fine stone concrete structure 3 is laid between the main beam 1 and the front approach slab 4. The front approach slab 4 and the rear approach slab 5 are installed and connected by tie rods 12. Sliding layers 7 are set between the front approach slab 4 and the sleeper beam 6, and between the rear approach slab 5 and the sleeper beam 6, respectively. The material selection of the sliding layer 7 must meet the requirements of wear resistance, aging resistance, and a certain degree of elasticity to ensure that the approach slabs have a certain degree of displacement and rotation freedom during the use of the bridge, thereby adapting to uneven settlement of the foundation. A plain concrete cushion layer 8 is poured on the outside of the sleeper beam 6, and a cement-stabilized crushed stone cushion layer 9 is laid underneath it. After the construction is completed, an overall inspection and acceptance is carried out to ensure that all structural components meet the design requirements and that the connections are firm and reliable.

[0023] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on 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.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that modifications may be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel abutment transition slab structure for a short-span seamless bridge, characterized in that: The structure includes a main beam (1), a support beam (2), a fine stone concrete continuous structure (3), a front slab (4), a rear slab (5), a sleeper beam (6), a sliding layer (7), a plain concrete cushion layer (8), and a cement-stabilized crushed stone cushion layer (9). The main beam (1) is fixedly connected to the middle of the support beam (2). The front slab (4) is connected to one side of the main beam (1). A fine stone concrete continuous structure (3) is provided between the main beam (1) and the front slab (4). The front slab (4) and the rear slab (5) are connected by tie rods (12). Sleeper beams (6) are provided below both the front slab (4) and the rear slab (5). A sliding layer (7) is provided between the front slab (4) and the sleeper beam (6). A sliding layer (7) is also provided between the rear slab (5) and the sleeper beam (6). A plain concrete cushion layer (8) is poured on the outside of the sleeper beam (6). A cement-stabilized crushed stone cushion layer (9) is fixedly provided below the plain concrete cushion layer (8).

2. The abutment transition plate structure of the novel small-span seamless bridge according to claim 1, characterized in that: A sliding layer (7) is provided between the front slab (4) and the support beam (2). An anchor bolt (10) is installed through the support beam (2). A steel sleeve (11) is installed through the front slab (4). The steel sleeve (11) is connected to the anchor bolt (10).

3. The abutment transition slab structure of the novel small-span seamless bridge according to claim 2, characterized in that: The slip layer (7) is a 2cm thick rubber pad, the anchor bolt (10) has a penetration diameter of 25mm, the anchor bolt (10) is an HRB400 steel bar, and the steel sleeve (11) is a Q235B steel with a wall thickness of 3mm and a diameter of 80mm.

4. The abutment transition slab structure of the novel small-span seamless bridge according to claim 1, characterized in that: The tie rod (12) is located at the center of the front plate (4) and the rear plate (5), and the tie rod (12) is a 16mm diameter HRB400 steel bar.

5. The abutment transition slab structure of the novel small-span seamless bridge according to claim 1, characterized in that: The fine aggregate concrete continuous structure (3) is made of C40 concrete.

6. The abutment transition slab structure of the new small-span seamless bridge according to claim 1, characterized in that: The plain concrete cushion layer (8) is a 30cm C25 plain concrete cushion layer.

7. The abutment transition slab structure of the novel small-span seamless bridge according to claim 1, characterized in that: The cement-stabilized crushed stone cushion layer (9) is a 25cm thick 5% cement-stabilized crushed stone cushion layer.

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