FEBD-based seamless bridge deck connection plate using t-type shear stud structure and construction method
The FEBD seamless bridge deck connection plate, constructed with T-shaped shear studs, combined with polyurethane pavement and corrugated steel bars, solves the problems of cracking and detachment of traditional bridge deck connection plates, achieving continuous seamless bridge deck and high vertical load-bearing capacity, and improving construction efficiency and shear resistance.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- FUZHOU UNIV
- Filing Date
- 2025-09-15
- Publication Date
- 2026-05-28
AI Technical Summary
Traditional bridge expansion joints are prone to damage, resulting in a shortened bridge lifespan and high maintenance costs. Furthermore, seamless bridge deck connecting plates are prone to cracking under complex stress conditions, making it difficult to achieve continuous seamlessness and high vertical load-bearing capacity of the bridge deck.
The FEBD seamless bridge deck connection plate, constructed with T-shaped shear studs, forms an integrated structure by setting a polyurethane pavement layer and T-shaped shear studs on the semi-continuous UHPC bridge deck connection plate, combined with corrugated steel bars and compressible elastic materials, thereby enhancing the connection strength and shear resistance of the upper and lower layers.
It achieves a continuous and seamless bridge deck, reduces defects such as pavement layer separation and edge curling, improves the shear resistance and construction efficiency of the bridge deck connecting plate, adapts to the complex stress state of the bridge deck, and reduces construction complexity.
Smart Images
Figure CN2025121273_28052026_PF_FP_ABST
Abstract
Description
FEBD Seamless Bridge Deck Connector with T-Shaped Shear Studs and Construction Method Technical Field
[0001] This invention relates to a seamless FEBD bridge deck connection plate constructed with T-shaped shear studs and its construction method. Background Technology
[0002] Bridges experience horizontal expansion and contraction, as well as bending deformation, due to temperature changes and the deflection of the main beam. Traditional jointed bridges typically incorporate expansion joints (as shown in Figure 1) at locations such as abutments, piers, and between the main beams to absorb this horizontal deformation, allowing vehicles to travel smoothly and quickly. The design philosophy of bridge expansion joints is to accommodate the temperature-induced expansion and contraction of the main beam, preventing this deformation from being constrained and generating excessive internal forces within the main beam. Over the past 20 years, the rapid increase in traffic volume has exacerbated the problems associated with bridge expansion joints, significantly impacting bridge lifespan and drastically increasing maintenance workload and costs. Surveys indicate that traditional expansion joints suffer from issues such as steel beam breakage, joint blockage, rubber breakage, aging, detachment, or jutting out, easy cracking and breakage of the concrete in the anchorage zone, high installation requirements, and a tendency for vehicles to bounce. Statistics show that over 50% of bridges in my country are damaged due to expansion joints, resulting in enormous repair and replacement costs, and the posing significant safety risks to vehicles due to broken or protruding steel beams.
[0003] To reduce the use of bridge expansion joints and achieve a continuous, seamless bridge deck, bridge deck connection plates (Figure 2) or seamless expansion joints (Figure 3) are commonly used. However, the design philosophy of bridge deck connection plates is to resist the stress and deformation of the main beam structure (such as resisting negative bending moments), employing a "rigid-to-rigid" approach (i.e., force-based design). In practical applications, due to the special location of the bridge deck connection plates, they not only bear the rotational deformation of the main beam ends caused by vehicle loads, but also the longitudinal expansion and contraction deformation of the main beam caused by temperature changes. This long-term exposure to complex stress conditions makes them prone to cracking. Although the use of emerging high-performance materials such as UHPC or ECC helps improve this problem, related issues still exist. Seamless expansion joints are a design method based on "deformation" (performance), absorbing the expansion and contraction deformation of the main beam through elastic expansion bodies. However, their drawbacks include limited expansion and contraction capacity, insufficient vertical bearing capacity, and the inability to cross end joints independently, requiring support from bottom steel plates. However, the bending of the steel plates themselves and stress concentration at the ends of the plates easily cause cracking of the elastic body.
[0004] To accommodate the expansion and contraction deformation between beams or between beams and platforms, it is important to propose a novel combined seamless expansion joint that possesses both significant horizontal expansion and contraction capacity and high vertical bearing capacity. Based on the design concept of "deformation" (performance), a semi-continuous UHPC bridge deck connection plate with side-stiffened steel plates is proposed through structural measures of "making large gaps smaller" and "making small gaps seamless," as shown in Figure 4.
[0005] The UHPC bridge deck connecting slab is completely separated by expansion joints, with only the internal corrugated reinforcing bars remaining continuous. This structure transforms the original large joints (expansion joints) between main beams or between main beams and abutments into smaller joints (expansion joints) between the individual blocks of the semi-continuous UHPC bridge deck connecting slab. These smaller joints are then filled with compressible elastic filler, further making them seamless. However, this bridge deck connecting slab also presents certain problems. Due to the significant difference in material properties between the upper and lower parts of the slab, their bonding properties alone are insufficient. Under vehicle loads, the upper pavement layer can detach from the lower semi-continuous UHPC bridge deck connecting slab, leading to pavement damage.
[0006] Therefore, some structural measures need to be taken to improve the connection strength between the upper and lower structures of the bridge deck connecting plate in order to improve its overall performance. Technical issues
[0007] The purpose of this invention is to provide a FEBD seamless bridge deck connecting plate with a T-shaped shear stud structure and a construction method thereof. This connecting plate can not only achieve seamless bridge deck, but also effectively shorten the construction period and have little impact on traffic. Technical solutions
[0008] The technical solution of the present invention is as follows: a FEBD seamless bridge deck connection plate with a T-shaped shear stud structure, including a semi-continuous UHPC bridge deck connection plate for spanning the upper side of the expansion gap at the beam end, wherein a polyurethane pavement layer for bearing vehicle load is laid on the upper side of the semi-continuous UHPC bridge deck connection plate, and a T-shaped shear stud is provided between the polyurethane pavement layer and the semi-continuous UHPC bridge deck connection plate.
[0009] Furthermore, the two ends of the polyurethane pavement layer extend into semi-continuous UHPC bridge deck connecting plates along the longitudinal direction of the bridge and extend into the top of the bridge deck.
[0010] Furthermore, the semi-continuous UHPC bridge deck connecting plate includes several UHPC blocks arranged sequentially along the longitudinal direction of the bridge. The reinforcing bars in the UHPC blocks are corrugated reinforcing bars with a certain curvature. A "T"-shaped expansion joint is provided between two adjacent UHPC blocks. Each UHPC block and the expansion joint are connected in series by the corrugated reinforcing bars. The "T"-shaped expansion joint is filled with compressible elastic material.
[0011] Furthermore, the UHPC block is a prefabricated segment, with an unbonded 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 width of the "T"-shaped expansion joint is 2-3 cm.
[0014] The compressible elastic material is rubber, silicone, or polyurethane elastomer.
[0015] Furthermore, multiple T-shaped shear studs are provided between the polyurethane pavement layer and the semi-continuous UHPC bridge deck connecting plate. The lower part of the T-shaped shear studs is tied to the reinforcing cage of the semi-continuous UHPC bridge deck connecting plate, and the top of the T-shaped shear studs protrudes from the semi-continuous UHPC bridge deck connecting plate and is connected to the polyurethane pavement layer.
[0016] Furthermore, the T-shaped shear studs are evenly distributed in the transverse and longitudinal directions of the bridge.
[0017] A construction method for a seamless FEBD bridge deck connection slab using T-shaped shear studs includes the following steps:
[0018] (1) Bend the corrugated steel bars required in the semi-continuous UHPC bridge deck connecting plate according to the dimensions in the drawings and the site requirements in the factory, and do a good job of waterproofing, rust prevention and non-bonding treatment;
[0019] (2) Formwork is erected, and compressible elastic material is filled in the "T"-shaped expansion joint. Holes for 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.
[0020] (3) Tie T-shaped shear studs to the steel cage of the semi-continuous UHPC bridge deck connection plate, mix and pour the semi-continuous UHPC bridge deck connection plate;
[0021] (4) Mix and pour the upper polyurethane paving layer;
[0022] (5) After leveling the main beam with epoxy mortar, lay a non-bonding layer and position and install the UHPC precast blocks on top;
[0023] (6) Wet splicing of UHPC blocks in the transverse direction and binding and welding of the UHPC block's pre-reserved protruding steel bars to the original bridge deck steel cage in the longitudinal direction;
[0024] (7) Subsequently, the formwork of the post-cast section blocks is erected, and the post-cast section UHPC is mixed, poured longitudinally and transversely, and cured.
[0025] (8) After the curing is completed, a polyurethane pavement layer is laid at both ends of the bridge deck connecting plate to enhance the integrity, and then the ordinary bridge deck pavement layer can be laid. Beneficial effects
[0026] Compared with the prior art, the present invention has the following advantages:
[0027] 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 block is discontinuous.
[0028] 2. The FEBD seamless bridge deck connection plate adopts the design concept of traditional expansion joints to adapt to longitudinal bridge deformation, and combines bridge deck connection plates, seamless expansion joints and other methods to present a continuous and seamless bridge deck. While adapting to the amount of expansion and contraction caused by ambient temperature, it ensures that the bridge deck is continuous and seamless and the driving comfort is guaranteed.
[0029] 3. This FEBD seamless bridge deck connection plate effectively improves the bonding performance between the upper polyurethane pavement layer and the lower semi-continuous UHPC bridge deck connection plate, significantly reducing pavement layer separation and edge curling caused by large deformation differences when wheels roll over expansion joints. It better adapts to the complex spatial stress state of the bridge deck and meets the normal usage requirements of continuous bridge deck structures.
[0030] 4. This FEBD seamless bridge deck connection plate enhances the shear resistance of the seamless bridge deck connection plate. By incorporating shear studs, the load on the upper part can be effectively distributed and transferred to the lower connection plate, thereby significantly enhancing the shear resistance of the bridge deck connection plate.
[0031] 5. The FEBD seamless bridge deck connection panel offers convenient construction performance. Its simple structure eliminates complex steel reinforcement connections; special steel reinforcement sections are prefabricated in the factory for mass production. The prefabricated FEBD seamless bridge deck connection panel sections are then transported to the site for installation. Suitable for new bridge construction, it eliminates the cumbersome process of chiseling and installing expansion joints, allowing for a seamless installation process. Attached Figure Description
[0032] Figure 1 is a schematic diagram of a traditional telescopic device;
[0033] Figure 2 shows the structure of a traditional bridge deck connection plate.
[0034] Figure 3 is a structural diagram of the seamless telescopic device;
[0035] Figure 4 is a schematic diagram of the combined telescopic device of the present invention;
[0036] Figure 5 is a schematic diagram of the FEBD seamless bridge deck connection plate structure of the present invention;
[0037] Figure 6 is a schematic diagram of the single seamless bridge deck connecting plate structure of the present invention;
[0038] Figure 7 is a top view of Figure 6 of the present invention;
[0039] In the diagram: 1-Polyurethane paving layer; 2-T-shaped shear studs; 3-UHPC block; 4-"T"-shaped expansion joint; 5-Wave-shaped reinforcing bars. Embodiments of the present invention
[0040] To make the above features and advantages of the present invention more readily understood, specific embodiments are described below in conjunction with the accompanying drawings, but the present invention is not limited thereto.
[0041] Refer to Figures 5 to 7
[0042] A seamless FEBD bridge deck connection plate constructed with T-shaped shear studs includes a semi-continuous UHPC bridge deck connection plate spanning the expansion gap at the beam end. A polyurethane pavement layer 1 for bearing vehicle loads is laid on the upper side of the semi-continuous UHPC bridge deck connection plate. T-shaped shear studs 2 are positioned between the polyurethane pavement layer and the semi-continuous UHPC bridge deck connection plate. The T-shaped shear studs ensure a tight bond between the upper polyurethane pavement layer and the lower semi-continuous UHPC bridge deck connection plate, preventing the pavement layer from detaching and failing, thus forming an integrated structure and improving its overall performance.
[0043] Due to the significant difference in material properties between the upper and lower parts of the FEBD seamless bridge deck connecting plate, the bonding performance between them is poor, making the polyurethane pavement layer prone to detachment under vehicle loads. Therefore, the T-shaped shear stud structure is an intermediate layer, designed to enhance the connection strength between the upper and lower parts, prevent the upper pavement layer from detaching, and improve overall integrity.
[0044] In this embodiment, the polyurethane pavement layer is composed of polyurethane asphalt, mineral powder, and quartz sand mixed in a certain proportion. Besides the upper part of the bridge deck connecting plate, the two ends of the polyurethane pavement layer also need to extend semi-continuous UHPC bridge deck connecting plates along the longitudinal direction of the bridge and extend into the top of the bridge deck to ensure the integrity of the pavement layer and prevent it from detaching.
[0045] In this embodiment, the semi-continuous UHPC bridge deck connecting plate includes several UHPC blocks 3 arranged sequentially along the longitudinal direction of the bridge. The reinforcing bars in the UHPC blocks are corrugated reinforcing bars 5 with a certain curvature. A "T"-shaped expansion joint 4 is provided between adjacent UHPC blocks. The UHPC blocks and expansion joints are connected in series by the corrugated reinforcing bars. The "T"-shaped expansion joints are filled with a compressible elastic material with high porosity and good deformation performance. The horizontal expansion and contraction deformation of the main beam is absorbed through the "T"-shaped expansion joints.
[0046] UHPC material possesses high strength, high crack resistance, fatigue resistance, and durability. It is mainly used to span expansion joints at beam ends and provide vertical support to withstand wheel loads, while also withstanding the circumferential compression of the internal corrugated steel reinforcement. Because each UHPC block is completely separated, the concrete stress can be fully released, resulting in relatively low overall stress.
[0047] In this embodiment, the UHPC block is a prefabricated segment. The corrugated steel reinforcement is wrapped with an unbonded layer, and the UHPC blocks on both sides have pre-installed protruding steel reinforcement in the longitudinal direction of the bridge.
[0048] In this embodiment, the corrugated steel bars are mainly used to connect the various UHPC blocks and the "T"-shaped expansion joints, similar to steel springs, so that each block and the expansion joint work together, allowing each "T"-shaped expansion joint to evenly bear the deformation caused by temperature expansion and contraction. The unbonded layer material wrapped around the corrugated steel bars is generally made of a material with good elasticity and waterproof and corrosion-resistant properties. Its main purpose is to achieve unbonded bonding between the corrugated steel bars and the UHPC blocks, allowing the corrugated steel bars to be relatively free to be longitudinally compressed and stretched within the UHPC blocks on both sides of the expansion joint, thus releasing the stress of the steel bars.
[0049] In this embodiment, for on-site construction considerations, the compressible elastic material is integrated with the polyurethane paving layer for ease of construction.
[0050] In this embodiment, the width of the "T"-shaped expansion joint is 2-3 cm, while the expansion gap at the beam end is generally more than 10 cm. Therefore, through the bridging effect of the semi-continuous UHPC bridge deck connecting plate, the large gap between the beam ends can be transformed into a small expansion joint between UHPC blocks, thus making it easier and more convenient to deal with the expansion joint problem and achieve a continuous and seamless bridge deck (continuous and seamless bridge deck pavement layer).
[0051] In this embodiment, the compressible elastic material is rubber, silicone, or polyurethane elastomer to prevent deformation of the expansion joint from reflecting onto the bridge deck pavement layer and thus avoiding cracking. Specifically, polyurethane foam can be used.
[0052] In this embodiment, multiple T-shaped shear studs are provided between the polyurethane pavement layer and the semi-continuous UHPC bridge deck connecting plate. The lower part of the T-shaped shear studs is tied to the reinforcing cage of the semi-continuous UHPC bridge deck connecting plate, and the top of the T-shaped shear studs protrudes from the semi-continuous UHPC bridge deck connecting plate and is connected to the polyurethane pavement layer to prevent the upper polyurethane pavement layer from detaching and to enhance the overall integrity.
[0053] In this embodiment, the T-shaped shear studs are evenly distributed in the transverse and longitudinal directions of the bridge.
[0054] FEBD seamless bridge deck connecting plates are generally prefabricated in the factory and placed at the beam ends, and then cast together with the main beam as a whole by pre-reserved steel bars.
[0055] A construction method for a seamless FEBD bridge deck connection slab using T-shaped shear studs includes the following steps:
[0056] (1) Bend the corrugated steel bars required in the semi-continuous UHPC bridge deck connecting plate according to the dimensions in the drawings and the site requirements in the factory, and do a good job of waterproofing, rust prevention and non-bonding treatment;
[0057] (2) Formwork is erected, and compressible elastic material is filled in the "T"-shaped expansion joint. Holes for 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.
[0058] (3) Tie T-shaped shear studs to the steel cage of the semi-continuous UHPC bridge deck connection plate, mix and pour the semi-continuous UHPC bridge deck connection plate;
[0059] (4) Mix and pour the upper polyurethane paving layer;
[0060] (5) After leveling the main beam with epoxy mortar, lay a non-bonding layer and position and install the UHPC precast blocks on top;
[0061] (6) Wet splicing of UHPC blocks in the transverse direction and binding and welding of the UHPC block's pre-reserved protruding steel bars to the original bridge deck steel cage in the longitudinal direction;
[0062] (7) Subsequently, the formwork of the post-cast section blocks is erected, and the post-cast section UHPC is mixed, poured longitudinally and transversely, and cured.
[0063] (8) After the curing is completed, a polyurethane pavement layer is laid at both ends of the bridge deck connecting plate to enhance the integrity, and then the ordinary bridge deck pavement layer can be laid.
[0064] The above description is only a preferred embodiment of the present invention. For those skilled in the art, designing different forms of FEBD seamless bridge deck connection plates and construction methods using T-shaped shear studs according to the teachings of the present invention does not require creative labor. All equivalent changes, modifications, substitutions and variations made in accordance with the scope of the patent application of the present invention without departing from the principles and spirit of the present invention shall be covered by the present invention.
Claims
1. A FEBD seamless bridge deck connector plate configured with T-shaped shear studs, characterized by, It includes a semi-continuous UHPC bridge deck connecting plate for spanning the expansion gap at the beam end, the upper side of which is covered with a polyurethane pavement layer for bearing vehicle loads, and T-shaped shear studs are provided between the polyurethane pavement layer and the semi-continuous UHPC bridge deck connecting plate.
2. The FEBD seamless bridge deck connector plate configured with T-shaped shear studs according to claim 1, wherein, The two ends of the polyurethane pavement layer extend into semi-continuous UHPC bridge deck connecting plates along the longitudinal direction of the bridge and extend into the top of the bridge deck.
3. The FEBD seamless bridge deck connector plate configured with T-shaped shear studs according to claim 1 or 2, characterized in that, The semi-continuous UHPC bridge deck connecting plate includes several UHPC blocks arranged sequentially along the longitudinal direction of the bridge. The steel bars in the UHPC blocks are corrugated steel bars with a certain curvature. A "T"-shaped expansion joint is provided between two adjacent UHPC blocks. Each UHPC block and the expansion joint are connected in series by the corrugated steel bars. The "T"-shaped expansion joint is filled with compressible elastic material.
4. The FEBD seamless bridge deck connector plate configured with T-shaped shear studs according to claim 3, wherein, The UHPC block is a precast segment, with an unbonded layer wrapped around the corrugated steel bars. The UHPC blocks on both sides have pre-reserved protruding steel bars in the longitudinal direction of the bridge.
5. The FEBD seamless bridge deck connector plate configured with T-shaped shear studs according to claim 3, wherein, The compressible elastic material is integrated with the polyurethane paving layer.
6. The FEBD seamless bridge deck connector plate configured with T-shaped shear studs according to claim 3, wherein, The width of the "T"-shaped expansion joint is 2-3 cm.
7. The FEBD seamless bridge deck connector plate configured with T- shear studs according to claim 4, 5 or 6, wherein, The compressible elastic material is rubber, silicone, or polyurethane elastomer.
8. The FEBD seamless bridge deck connector plate configured with T- shear studs according to claim 1, 2, 4, 5 or 6, wherein, Multiple T-shaped shear studs are provided between the polyurethane pavement layer and the semi-continuous UHPC bridge deck connecting plate. The lower part of the T-shaped shear studs is tied to the steel cage of the semi-continuous UHPC bridge deck connecting plate, and the top of the T-shaped shear studs protrudes from the semi-continuous UHPC bridge deck connecting plate and is connected to the polyurethane pavement layer.
9. The FEBD seamless bridge deck connector plate configured with T-shaped shear studs according to claim 8, wherein, The T-shaped shear studs are evenly distributed in the transverse and longitudinal directions of the bridge.
10. A construction method applied to the FEBD seamless bridge deck connecting plate configured with a T-shaped shear stud nail according to claim 3, characterized in that, Includes the following steps: (1) Bend the corrugated steel bars required in the semi-continuous UHPC bridge deck connecting plate according to the dimensions in the drawings and the site requirements in the factory, and do a good job of waterproofing, rust prevention and non-bonding treatment; (2) Formwork is erected, and compressible elastic material is filled in the "T"-shaped expansion joint. Holes for 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) Tie T-shaped shear studs to the steel cage of the semi-continuous UHPC bridge deck connection plate, mix and pour the semi-continuous UHPC bridge deck connection plate; (4) Mix and pour the upper polyurethane paving layer; (5) After leveling the main beam with epoxy mortar, lay a non-bonding layer and position and install the UHPC precast blocks on top; (6) Wet splicing of UHPC blocks in the transverse direction and binding and welding of the UHPC block's pre-reserved protruding steel bars to the original bridge deck steel cage in the longitudinal direction; (7) Subsequently, the formwork of the post-cast section blocks is erected, and the post-cast section UHPC is mixed, poured longitudinally and transversely, and cured. (8) After the curing is completed, a polyurethane pavement layer is laid at both ends of the bridge deck connecting plate to enhance the integrity, and then the ordinary bridge deck pavement layer can be laid.