FEBD seamless bridge deck connecting plate adopting T-shaped shear nail structure

Abstract

The utility model relates to an FEBD seamless bridge deck connecting plate adopting a T-shaped shear nail structure, which comprises a semi-continuous UHPC bridge deck connecting plate arranged on the upper side of a telescopic gap at a beam end in a crossing manner, and a polyurethane pavement layer used for bearing vehicle load is paved on the upper side of the semi-continuous UHPC bridge deck connecting plate. T-shaped shear nails are arranged between the polyurethane pavement layer and the semi-continuous UHPC bridge floor connecting plate. According to the connecting plate, the seamless bridge floor can be realized, and the diseases such as pavement layer disengagement and hemming caused by large deformation difference when wheels pass through the expansion joint are obviously relieved; and in addition, the complex space stress state of the bridge deck can be better adapted, the normal use requirement of the bridge deck continuous structure is met, the construction period is effectively shortened, and the influence on traffic is small.

Description

Technical Field

[0001] The utility model relates to a FEBD seamless bridge deck connection plate constructed with T-shaped shear nails. Background Art

[0002] Bridges will experience horizontal expansion and contraction and bending deformation under the influence of temperature and main beam deflection. In order to absorb this horizontal deformation, traditional bridges with seams usually set expansion gaps (such as Figure 1 ), and install a telescopic device in the telescopic gap to allow vehicles to travel smoothly and quickly. The design concept of the bridge telescopic device is to adapt it to the temperature expansion and contraction deformation of the main beam, so that the deformation is not constrained and a large internal force is generated in the main beam. In the past 20 years, the rapid growth of traffic volume has made the expansion joint disease of bridges more and more serious, greatly affecting the service life of the bridge, and the maintenance workload and cost have also increased sharply. Investigations have shown that traditional telescopic devices have problems such as broken steel beams, blocked gaps, broken, aged, falling off or jumping out of rubber, easy cracking and shattering of concrete in the anchoring area, high installation requirements, and easy jumping. According to statistics, more than 50% of the bridges in my country have been damaged by telescopic devices, resulting in huge repair and replacement costs, and broken and protruding steel beams will pose a great safety risk to driving.

[0003] In order to reduce the use of bridge expansion devices and make the bridge deck as continuous and seamless as possible, a bridge deck connection plate structure is often used ( Figure 2 ) or seamless telescopic device ( Figure 3 ). However, the design concept of the bridge deck connection plate is to resist the stress and deformation of the main beam structure (such as resisting the negative bending moment), "using rigidity to overcome rigidity" (that is, force-based design). In actual application, due to the special position of the bridge deck connection plate, it not only has to withstand the rotational deformation of the main beam end caused by vehicle loads and other effects, but also has to withstand the longitudinal expansion and contraction deformation of the main beam caused by temperature changes of the main beam. It is in a complex stress situation for a long time and is prone to cracking and other problems. Although the use of emerging high-performance materials such as UHPC or ECC can help to improve this problem, related problems still exist. The seamless expansion device is a design method based on "deformation" (performance), and uses elastic expansion bodies to absorb the expansion and contraction deformation of the main beam, but its defects are small expansion and contraction capacity, insufficient vertical bearing capacity, and no ability to cross the end seam. It needs the support of the bottom steel plate, but the bending of the steel plate itself and the stress concentration at the end of the steel plate can easily cause cracking of the elastic body.

[0004] In order to adapt to the expansion and contraction deformation between beams or beams and platforms, it is important to propose a new type of combined seamless expansion and contraction device with both large horizontal expansion and contraction deformation capacity and high vertical bearing capacity. Based on the design concept of "deformation" (performance), through the construction measures of "large seams into small seams" and "small seams into seamless", a semi-continuous UHPC bridge deck connection plate with side-wrapped stiffening steel plates was proposed, such as Figure 4 .

[0005] This UHPC bridge deck connector is completely separated by expansion joints, with only the internal corrugated steel bars being continuous. This construction transforms the original "large gaps" (expansion joints) between "main beams" or "main beams and abutments" into "small gaps" (expansion joints) between the individual UHPC blocks of the semi-continuous bridge deck connector. Each expansion joint is then filled with a compressible elastic filler, further rendering the "small gaps" seamless. However, this bridge deck connector also presents certain problems. Due to the significant difference in material properties between the upper and lower parts of the bridge deck connector, relying solely on their inherent bonding properties is completely insufficient. Under vehicle loads, the upper pavement layer can separate from the lower semi-continuous UHPC bridge deck connector, causing damage to the pavement layer.

[0006] To this end, some structural measures need to be taken to increase the connection strength between the superstructure and the substructure of the bridge deck connection plate to improve its overall performance. Utility Model Content

[0007] The purpose of the utility model is to provide a FEBD seamless bridge deck connection plate constructed with T-shaped shear nails, which can not only realize the seamlessness of the bridge deck, but also effectively shorten the construction period and have little impact on traffic.

[0008] The technical solution of the utility model is: a FEBD seamless bridge deck connection plate constructed with T-shaped shear nails, including a semi-continuous UHPC bridge deck connection plate for spanning the upper side of the expansion gap at the beam end, a polyurethane pavement layer for bearing vehicle loads is laid on the upper side of the semi-continuous UHPC bridge deck connection plate, and T-shaped shear nails are arranged between the polyurethane pavement layer and the semi-continuous UHPC bridge deck connection plate.

[0009] Furthermore, semi-continuous UHPC bridge deck connection plates are extended from both ends of the polyurethane pavement layer along the longitudinal direction of the bridge and extend above the bridge deck.

[0010] Furthermore, the semi-continuous UHPC bridge deck connection plate includes several UHPC blocks arranged in sequence along the longitudinal direction of the bridge. The steel bars in the UHPC blocks are corrugated steel bars with a certain bending curvature. A "T"-shaped expansion joint is provided between two adjacent UHPC blocks. Each UHPC block and the expansion joint are connected in series through the corrugated steel bars, and the "T"-shaped expansion joint is filled with compressible elastic material.

[0011] Furthermore, the UHPC blocks are prefabricated sections, with a non-bonding layer wrapped around the corrugated steel bars, and the UHPC blocks on both sides have reserved protruding steel bars in the longitudinal direction of the bridge.

[0012] Furthermore, the compressible elastic material is integrated with the polyurethane pavement layer.

[0013] Furthermore, the compressible elastic material is rubber, silicone or polyurethane elastomer.

[0014] Furthermore, a plurality of T-shaped shear nails are provided between the polyurethane pavement layer and the semi-continuous UHPC bridge deck connection plate. The lower portion of the T-shaped shear nails is tied to the steel cage of the semi-continuous UHPC bridge deck connection plate, and the top portion of the T-shaped shear nails is exposed from the semi-continuous UHPC bridge deck connection plate and is connected to the polyurethane pavement layer.

[0015] Furthermore, the T-shaped shear studs are evenly distributed in the transverse and longitudinal directions of the bridge.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] 1. The biggest difference between the FEBD seamless bridge deck connection plate and the traditional continuous bridge deck connection plate is that it is not completely continuous. Only the longitudinal corrugated steel bars in the bridge deck connection plate are continuous, while the UHPC concrete blocks are discontinuous.

[0018] 2. The FEBD seamless bridge deck connection plate draws on the design concept of traditional expansion devices to adapt to longitudinal bridge deformation, and combines the bridge deck connection plate and seamless expansion joints to make the bridge deck continuous and seamless. While adapting to the expansion and contraction deformation caused by the ambient temperature, it ensures a continuous and seamless bridge deck and comfortable driving.

[0019] 3. The FEBD seamless bridge deck connector effectively improves the connection between the upper polyurethane pavement layer and the lower semi-continuous UHPC bridge deck connector. This significantly reduces pavement separation and curling caused by large differential deformation when wheels pass over expansion joints. It better adapts to the complex spatial stress conditions of the bridge deck and meets the normal operating requirements of a continuous bridge deck structure.

[0020] 4. The FEBD seamless bridge deck connector plate improves the shear resistance of the seamless bridge deck connector plate. By installing shear studs, the load on the upper part is effectively distributed and transferred to the lower connector plate, thereby effectively enhancing the shear resistance of the bridge deck connector plate.

[0021] 5. The FEBD seamless bridge deck connection plate offers convenient construction. Its simple deck connection structure eliminates complex steel bar connections. Special steel bar segments are prefabricated in the factory for mass production. The FEBD seamless bridge deck connection plate precast segments are prefabricated in the factory and craned to the site for installation. Suitable for new bridge construction, it eliminates the tedious process of chiseling and installing expansion joints, allowing for a seamless installation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of a traditional telescopic device;

[0023] Figure 2 This is a structural diagram of a traditional bridge deck connection plate;

[0024] Figure 3 This is a structural diagram of a seamless telescopic device;

[0025] Figure 4 It is a schematic diagram of a combined telescopic device;

[0026] Figure 5 This is a schematic diagram of the structure of the FEBD seamless bridge deck connection plate of the utility model;

[0027] Figure 6 This is a schematic diagram of the structure of a single seamless bridge deck connection plate of the utility model;

[0028] Figure 7 For the utility model Figure 6 Schematic top view of

[0029] In the figure: 1- Polyurethane pavement layer 2- T-type shear studs 3- UHPC blocks 4- "T"-shaped expansion joints 5- Corrugated steel bars. DETAILED DESCRIPTION

[0030] To make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description, but the present invention is not limited thereto.

[0031] refer to Figures 5 to 7

[0032] A FEBD seamless bridge deck connector plate constructed with T-shaped shear studs includes a semi-continuous UHPC bridge deck connector plate that spans the upper side of the expansion gap at the beam end. A polyurethane pavement layer 1, designed to withstand vehicle loads, is laid on the upper side of the semi-continuous UHPC bridge deck connector plate. T-shaped shear studs 2 are located between the polyurethane pavement layer and the semi-continuous UHPC bridge deck connector plate. The T-shaped shear studs ensure a tight bond between the upper polyurethane pavement layer and the lower semi-continuous UHPC bridge deck connector plate, preventing the pavement layers from separating and potentially failing, forming an integrated structure and improving overall performance.

[0033] Due to the significant difference in material properties between the upper and lower sections of the FEBD seamless bridge deck connector, the bonding between them is poor, making the polyurethane pavement prone to separation under vehicle loads. Therefore, a T-shaped shear stud structure is installed between the two sections to strengthen the connection between the upper and lower sections, prevent separation of the upper pavement layer, and enhance integrity.

[0034] In this embodiment, the polyurethane pavement layer is composed of a mixture of polyurethane asphalt, mineral powder, and quartz sand in a specific ratio. In addition to the upper portion of the bridge deck connector plate, the polyurethane pavement layer also requires semi-continuous UHPC bridge deck connector plates extending longitudinally along the bridge and extending above the bridge deck to ensure the integrity of the pavement layer and prevent it from detaching.

[0035] In this embodiment, the semi-continuous UHPC bridge deck connection plate comprises several UHPC blocks 3 arranged sequentially along the longitudinal direction of the bridge. The steel bars in these UHPC blocks are curved corrugated steel bars 5. T-shaped expansion joints 4 are provided between adjacent UHPC blocks. The UHPC blocks and expansion joints are connected in series via the corrugated steel bars. The T-shaped expansion joints are filled with a compressible elastic material with high porosity and good deformation properties. These T-shaped expansion joints absorb horizontal expansion and contraction of the main beam.

[0036] UHPC, with its high strength, crack resistance, fatigue resistance, and durability, is primarily used to bridge the expansion gap at the beam ends and provide vertical support to withstand wheel loads, while also withstanding the circumferential compression of the internal corrugated steel bars. Because each UHPC block is completely separated, concrete stress can be fully released, resulting in minimal stress overall.

[0037] In this embodiment, the UHPC blocks are prefabricated sections. A non-bonding layer is wrapped around the corrugated steel bars, and the UHPC blocks on both sides have reserved protruding steel bars in the longitudinal direction of the bridge.

[0038] In this embodiment, the corrugated steel bars are primarily used to connect the UHPC blocks and the T-shaped expansion joints. Like a steel spring, they enable the blocks and the expansion joints to work together, allowing each T-shaped expansion joint to evenly absorb thermal expansion and contraction. The non-bonded layer surrounding the corrugated steel bars is typically made of a highly elastic, waterproof, and corrosion-resistant material. This ensures that the corrugated steel bars are not bonded to the UHPC blocks, allowing them to relatively freely compress and stretch longitudinally within the UHPC blocks on both sides of the expansion joint, thus relieving stress on the bars.

[0039] In this embodiment, for on-site construction considerations, the compressible elastic material is integrated with the polyurethane pavement layer to facilitate construction.

[0040] In this embodiment, the width of the T-shaped expansion joint is 2-3 cm, while the expansion gap at the beam ends typically exceeds 10 cm. Therefore, the bridging effect of the semi-continuous UHPC deck connector plate can transform the large gap between the beam ends into a small expansion joint between the UHPC blocks, making it easier to address the expansion joint issue and achieving a continuous and seamless bridge deck (and a continuous and seamless bridge pavement layer).

[0041] In this embodiment, the compressible elastic material is rubber, silicone or polyurethane elastomer to prevent deformation of the expansion joint from being reflected to the bridge deck pavement layer and thus preventing cracking of the bridge deck pavement layer. Specifically, polyurethane foam can be used.

[0042] In this embodiment, a plurality of T-shaped shear nails are provided between the polyurethane pavement layer and the semi-continuous UHPC bridge deck connection plate. The lower portion of the T-shaped shear nails is tied to the steel cage of the semi-continuous UHPC bridge deck connection plate, and the top portion of the T-shaped shear nails is exposed from the semi-continuous UHPC bridge deck connection plate and connected to the polyurethane pavement layer, thereby preventing the upper polyurethane pavement layer from detaching and enhancing the integrity.

[0043] In this embodiment, the T-shaped shear studs are evenly distributed in the transverse and longitudinal directions of the bridge.

[0044] FEBD seamless bridge deck connection plates are generally prefabricated in the factory and placed at the beam ends, and then cast into a whole with the main beam through reserved steel bars.

[0045] The construction method of the FEBD seamless bridge deck connection plate constructed with T-type shear nails is as follows:

[0046] (1) In the factory, the corrugated steel bars required for the semi-continuous UHPC bridge deck connection plate are bent according to the drawing dimensions and on-site requirements, and waterproof, rust-proof and non-bonding treatments are performed; (2) Formwork is performed, and compressible elastic material is filled in the "T"-shaped expansion joint, and holes for the corrugated steel bars to pass through are reserved in the compressible elastic material. The treated corrugated steel bars are passed through the "T"-shaped expansion joint and some steel bars are reserved on the outside; (3) T-shaped shear nails are tied to the steel cage of the semi-continuous UHPC bridge deck connection plate, and the semi-continuous UHPC bridge deck connection plate is mixed and cast; (4) The upper polyurethane is mixed and cast. Polyester pavement layer; (5) After leveling with epoxy mortar on the main beam, lay a non-bonding layer and position the UHPC prefabricated blocks on it; (6) Wet-join the UHPC blocks in the transverse direction of the bridge, and complete the binding and welding of the extended steel bars reserved for the UHPC blocks and the original bridge deck steel cage in the longitudinal direction; (7) Then support the formwork of the post-casting section blocks, and at the same time mix and cast the UHPC in the longitudinal and transverse directions of the post-casting section and carry out maintenance work; (8) After the maintenance is completed, lay a section of polyurethane pavement layer at both ends of the bridge deck connection plate to enhance the integrity, and then lay the ordinary bridge deck pavement layer.

[0047] If the present invention discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by integral molding using a casting process) (except where it is obviously not possible to use an integrated molding process).

[0048] In addition, unless otherwise stated, the terms used in any technical solution disclosed in the above-mentioned utility model to express positional relationships or shapes include states or shapes that are approximate, similar or close thereto.

[0049] Any component provided by the present invention can be assembled from multiple separate components, or can be a separate component manufactured by an integral forming process.

[0050] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A FEBD seamless bridge deck connection plate constructed with T-shaped shear nails, characterized in that: It includes a semi-continuous UHPC bridge deck connection plate for spanning the upper side of the expansion gap at the end of the beam. The upper side of the semi-continuous UHPC bridge deck connection plate is paved with a polyurethane pavement layer for bearing vehicle loads, and T-shaped shear nails are arranged between the polyurethane pavement layer and the semi-continuous UHPC bridge deck connection plate.

2. The FEBD seamless bridge deck connection plate with T-shaped shear nail structure according to claim 1 is characterized in that: Semi-continuous UHPC bridge deck connection plates are extended from both ends of the polyurethane pavement layer along the longitudinal direction of the bridge and extend into the top of the bridge deck.

3. The FEBD seamless bridge deck connection plate with T-shaped shear nail structure according to claim 1 is characterized in that: The semi-continuous UHPC bridge deck connection plate includes several UHPC blocks arranged in sequence along the longitudinal direction of the bridge. The steel bars in the UHPC blocks are corrugated steel bars with a certain bending curvature. A "T"-shaped expansion joint is set between adjacent UHPC blocks. Each UHPC block and the expansion joint are connected in series via the corrugated steel bars, and the "T"-shaped expansion joint is filled with compressible elastic material.

4. The FEBD seamless bridge deck connection plate with T-shaped shear nail structure according to claim 3 is characterized in that: The UHPC blocks are prefabricated sections, with a non-bonding layer wrapped around the corrugated steel bars. The UHPC blocks on both sides have reserved protruding steel bars in the longitudinal direction of the bridge.

5. The FEBD seamless bridge deck connection plate with T-shaped shear nail structure according to claim 3 is characterized in that: The compressible elastic material is integrated with the polyurethane paving layer.

6. The FEBD seamless bridge deck connection plate with T-shaped shear nail structure according to claim 3 is characterized in that: The compressible elastic material is rubber, silicone or polyurethane elastomer.

7. The FEBD seamless bridge deck connection plate with T-shaped shear nail structure according to claim 1 is characterized in that: A plurality of T-shaped shear nails are provided between the polyurethane pavement layer and the semi-continuous UHPC bridge deck connection plate. The lower portion of the T-shaped shear nails is tied to the steel cage of the semi-continuous UHPC bridge deck connection plate, and the top portion of the T-shaped shear nails is exposed from the semi-continuous UHPC bridge deck connection plate and is connected to the polyurethane pavement layer.

8. The FEBD seamless bridge deck connection plate with T-shaped shear nail structure according to claim 7 is characterized in that: The T-shaped shear studs are evenly distributed in the transverse and longitudinal directions of the bridge.

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