Seamless bridge deck connecting plate adopting built-in anchor rod structure

Abstract

The utility model relates to a seamless bridge deck connecting plate adopting a built-in anchor rod structure, which comprises a plurality of UHPC (Ultra High Performance Concrete) block bodies filled on expansion joints at beam ends, a pavement layer is arranged on the top surfaces of the plurality of UHPC block bodies, an elastic layer is filled on the expansion joints between the adjacent UHPC block bodies, the plurality of UHPC block bodies are connected in series through internal corrugated steel bars and anchor rods, and the elastic layer is filled on the expansion joints between the adjacent UHPC block bodies. The outer surface of the corrugated steel bar is wrapped with an unbonded layer, and the periphery of the anchor rod is coaxially sleeved with a peripheral sleeve. According to the lower semi-continuous UHPC bridge floor connecting plate, the integrity of the UHPC blocks of the lower semi-continuous UHPC bridge floor connecting plate is effectively improved, the problem that vertical displacement of all the UHPC blocks is not uniform under the vehicle load effect can be remarkably solved, and therefore the bridge floor flatness is improved, and the normal use requirement of a bridge floor continuous structure is met.

Description

Technical Field

[0001] This utility model relates to a seamless bridge deck connecting plate with built-in anchor bolts. Background Technology

[0002] Bridges experience horizontal expansion and contraction as well as bending deformation due to temperature changes and the deflection of the main girder. Traditional jointed bridges typically incorporate expansion joints at locations such as abutments, piers, and between the main girder to absorb this horizontal deformation. Figure 1 Expansion joints are installed within the expansion gap to ensure smooth and rapid vehicle movement. The design philosophy of bridge expansion joints is to adapt to the temperature-induced expansion and contraction deformation 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 led to increasingly severe problems with bridge expansion joints, significantly impacting bridge lifespan and drastically increasing maintenance workload and costs. Surveys show that traditional expansion joints suffer from problems such as steel beam breakage, gap blockage, rubber breakage, aging, detachment, or jumping out, easy cracking and breakage of the concrete in the anchorage area, high installation requirements, and a tendency for vehicles to jump. 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 surging steel beams pose a significant safety risk to vehicles.

[0003] To reduce the use of bridge expansion joints and to make the bridge deck as continuous and seamless as possible, bridge deck connection plates are often used. Figure 2 ) or seamless telescopic device ( Figure 3 However, the design philosophy of bridge deck connecting plates is to resist the stress and deformation of the main beam structure (such as resisting negative bending moments), employing a "rigid-against-rigid" approach (i.e., force-based design). In practical applications, due to the special location of the bridge deck connecting plates, they not only have to withstand 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. Being under complex stress conditions for extended periods, they are prone to cracking. Although the use of emerging high-performance materials such as UHPC or ECC helps to 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 small 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 steel 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 develop a novel combined seamless expansion joint that possesses both significant horizontal expansion and contraction capacity and high vertical bearing capacity. Therefore, based on the design concept of "deformation" (performance), this invention proposes a novel seamless bridge deck connection plate with built-in anchors through structural measures of "making large seams smaller" and "making small seams seamless." Utility Model Content

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a seamless bridge deck connection plate with built-in anchor bolts.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a seamless bridge deck connecting plate with built-in anchor rods, comprising a plurality of UHPC blocks filled in the expansion joints at the beam ends, a pavement layer provided on the top surface of the plurality of UHPC blocks, and an elastic layer filled in the expansion joints between adjacent UHPC blocks, the plurality of UHPC blocks being connected together by internal corrugated steel bars and anchor rods, the corrugated steel bars being covered with an unbonded layer, and a peripheral sleeve being coaxially fitted around the periphery of the anchor rods.

[0007] Preferably, the corrugated steel bars and anchor rods are evenly distributed along the longitudinal direction of the bridge.

[0008] Preferably, both ends of the corrugated steel bar extend to be cast integrally with the beam end.

[0009] Preferably, the ends of the anchor rods are fitted with end sleeves.

[0010] Preferably, the interior of each end sleeve is provided with a polyurethane foam filling layer.

[0011] Preferably, the paving layer is a polyurethane paving layer.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. It effectively improves the integrity between UHPC blocks in the lower semi-continuous UHPC bridge deck connecting plate, which can significantly reduce the problem of uneven vertical displacement of each UHPC block under vehicle load, thereby improving the flatness of the bridge deck and meeting the normal use requirements of the continuous bridge deck structure.

[0014] 2. Improve the crack resistance of the new seamless bridge deck connection plate. Anchor bolts form a constraint within the bridge deck connection plate, effectively limiting the shrinkage and expansion of concrete, reducing the generation and propagation of cracks. By providing additional constraint force, anchor bolts help delay the formation of cracks caused by temperature changes or loads.

[0015] 3. Anchor bolts improve the shear resistance of the new seamless bridge deck connecting plate and reduce vertical displacement and deformation caused by vehicle loads.

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1This is a schematic diagram of a traditional telescopic device.

[0018] Figure 2 This is a schematic diagram of a traditional bridge deck connection plate.

[0019] Figure 3 This is a schematic diagram of a traditional seamless telescopic device.

[0020] Figure 4 This is a schematic diagram of the structure of an embodiment of the present utility model.

[0021] Figure 5 This is a top view of the UHPC block according to an embodiment of the present invention.

[0022] In the diagram: 1. UHPC block, 2. pavement layer, 3. corrugated steel reinforcement, 4. anchor bolt, 5. perimeter sleeve, 6. end sleeve, 7. bridge deck, 8. jointed bridge expansion joint, 9. bridge deck pavement layer, 10. main beam, 11. bridge deck connecting plate, 12. road pavement layer, 13. unbonded layer, 14. main beam, 15. steel plate, 16. elastic expansion joint. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] like Figures 4-5 As shown, this embodiment provides a seamless bridge deck connection plate with built-in anchors. This structure not only achieves seamless bridge deck construction but also enhances bridge deck flatness. Furthermore, its design and construction are simple, effectively shortening the construction period, minimizing traffic impact, and facilitating widespread adoption. The seamless bridge deck connection plate with built-in anchors includes several UHPC blocks 1 installed on the expansion joints at the beam ends. A pavement layer 2 is provided on the top surface of the UHPC blocks, and an elastic layer is filled in the expansion joints between adjacent UHPC blocks. The UHPC blocks are connected in series by internal corrugated steel bars 3 and anchors 4. The corrugated steel bars are covered with an unbonded layer, and a peripheral sleeve 5 is coaxially fitted around the periphery of each anchor.

[0027] The pavement layer serves as the superstructure, directly bearing vehicle loads. The connecting plate formed by several UHPC blocks serves as the substructure. The built-in anchors can tightly connect adjacent UHPC blocks, enhancing the overall rigidity and strength of the structure and strengthening the integrity of each UHPC block. This effectively limits the vertical displacement of the UHPC blocks caused by vehicle vibrations, thereby maintaining the flatness of the bridge deck.

[0028] To ensure that the deformation performance of the connecting plate is not affected by the anchor bolt, a peripheral sleeve is installed around the anchor bolt, allowing the UHPC block to slide freely.

[0029] 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.

[0030] In this embodiment of the invention, the corrugated steel bars and anchor rods are evenly distributed along the longitudinal direction of the bridge.

[0031] The corrugated reinforcing bars, similar to steel springs, enable each UHPC block and expansion joint to work together, allowing each expansion joint to evenly bear the deformation caused by temperature expansion and contraction. The unbonded layer material wrapped around the corrugated reinforcing bars is generally made of a material with good elasticity, waterproof and corrosion resistant properties. Its main purpose is to achieve unbonded bonding between the corrugated reinforcing bars and the UHPC blocks, allowing the corrugated reinforcing 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 on the reinforcing bars.

[0032] In this embodiment of the utility model, both ends of the corrugated steel bar extend to be cast integrally with the beam end.

[0033] In this embodiment of the invention, the ends of the anchor rods are all fitted with end sleeves 6.

[0034] In this embodiment of the invention, the interior of each end sleeve is provided with a polyurethane foam filling layer.

[0035] This helps the anchor bolt not damage the surrounding concrete under pressure, thus not affecting the deformation performance of the connection plate.

[0036] In this embodiment of the invention, the paving layer is a polyurethane paving layer.

[0037] In this embodiment of the invention, the biggest difference between the seamless bridge deck connecting plate with built-in anchors and the traditional continuous bridge deck connecting plate is that it is not completely continuous; only the corrugated steel bars within the connecting plate are continuous, while the UHPC blocks are discontinuous. In contrast, the UHPC bridge deck in this invention is completely separated by expansion joints, with only the internal corrugated steel bars being continuous. This structure transforms the original large joints (expansion joints) between main beams or between main beams and abutments into small joints (expansion joints) between the UHPC blocks of the semi-continuous bridge deck connecting plate. Then, an elastic layer, which is a compressible elastic filler, is filled into each expansion joint, further making the small joints "seamless." A polyurethane pavement layer is then laid on the semi-continuous UHPC blocks.

[0038] Based on the above, because the individual UHPC blocks of the lower semi-continuous UHPC bridge deck connecting slab are independent, if they are only connected by corrugated steel bars, the vertical displacement of each UHPC block will not be completely uniform under vehicle loads and vibrations, leading to flatness issues in the connecting slab. Therefore, some structural measures are needed to improve the integrity between the individual UHPC blocks of the new seamless bridge deck connecting slab, thereby ensuring its overall integrity. Therefore, an anchor bolt structure is added inside the substructure. The anchor bolts ensure a tight connection between the individual UHPC blocks of the lower semi-continuous UHPC bridge deck connecting slab, preventing uneven vertical displacement caused by vehicle vibrations, forming an integrated structure, and improving the flatness of the bridge deck.

[0039] This new type of seamless bridge deck connecting plate is typically prefabricated in a factory and placed at the beam ends, then cast integrally with the main beam using pre-reserved reinforcing bars. This new seamless bridge deck connecting plate adopts the design concept of traditional expansion joints to accommodate longitudinal bridge deformation, and combines bridge deck connecting plates and seamless expansion joints to create a continuous and seamless bridge deck. While adapting to expansion and contraction caused by environmental temperature, it ensures a continuous and seamless bridge deck and comfortable driving experience.

[0040] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A seamless deck panel configured with a built-in anchor rod, characterized by: Several UHPC blocks are filled on the expansion joint at the beam end, the top surface of the several UHPC blocks is provided with a pavement layer, and the expansion joint between adjacent UHPC blocks is filled with an elastic layer, the several UHPC blocks are connected together through internal zigzag-shaped steel bars and anchor rods, the outer surface of the zigzag-shaped steel bars is wrapped with a non-bonding layer, and the peripheral part of the anchor rod is coaxially sleeved with a peripheral sleeve.

2. The seamless deck joint of claim 1, wherein: The zigzag-shaped steel bars and the anchor rods are uniformly distributed along the longitudinal bridge direction.

3. The seamless deck tie plate with built-in anchor rod configuration of claim 1, wherein: Both ends of the zigzag-shaped steel bars extend to be integrally poured with the beam end.

4. The seamless deck tie plate with built-in anchor rod configuration of claim 1, wherein: The end part of the anchor rod is sleeved with an end sleeve.

5. The seamless deck tie plate with built-in anchor rod configuration of claim 4, wherein: The inside of the end sleeve is provided with a polyurethane foam filling layer.

6. The seamless deck tie plate with built-in anchor rod configuration of claim 1, wherein: The pavement layer is a polyurethane pavement layer.

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