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

Abstract

The FEBD seamless bridge deck connecting plate adopting the T-shaped shear nail structure comprises a semi-continuous UHPC bridge deck connecting plate arranged on the upper side of a telescopic gap at the beam end in a striding mode, and a polyurethane pavement layer used for bearing vehicle loads is laid 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 invention relates to a FEBD seamless bridge deck connection plate constructed with T-shaped shear nails and a construction method. Background Art

[0002] Bridges will experience horizontal expansion and contraction and bending deformation due to temperature and main beam deflection. In order to absorb this horizontal deformation, traditional seamed bridges usually set expansion gaps (such as Figure 1 ), and install a telescopic device in the telescopic gap to allow the vehicle 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 bridges, 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, fallen off or jumped out rubber, easy cracking and crushing 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 cause great safety risks 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" (i.e. force-based design). In actual application, due to the special position of the bridge deck connection plate, it not only has to withstand the rotation deformation of the main beam end caused by vehicle loads, but also has to withstand the expansion and contraction deformation of the main beam in the longitudinal direction of the bridge 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 improve this problem, related problems still exist. The seamless expansion device is a design method based on "deformation" (performance), and absorbs the expansion and contraction deformation of the main beam through an elastic expansion body, but its defects are small expansion and deformation capacity, insufficient vertical bearing capacity, and no ability to cross the end seam. It needs to rely on 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 the elastic body to crack.

[0004] In order to adapt to the expansion and contraction deformation between "beams and 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 is proposed, such as Figure 4 .

[0005] The UHPC bridge deck connection plate is completely separated by expansion joints, with only the internal corrugated steel bars being continuous. Through this structure, the "large joints" (expansion joints) between the original "main beams and main beams" or "main beams and abutments" are transformed into "small joints" (expansion joints) between the blocks of the semi-continuous bridge deck connection plate UHPC; then, compressible elastic fillers are filled in each expansion joint to further make the "small joints" "seamless". However, there are also certain problems with the bridge deck connection plate. Due to the large difference in the material properties of the upper and lower parts of the bridge deck connection plate, it is not enough to rely solely on their own bonding properties. Under the action of vehicle loads, the upper pavement layer will be detached from the lower semi-continuous UHPC bridge deck connection plate, resulting in 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 connecting plate to improve its overall performance. Summary of the invention

[0007] The object of the present invention is to provide a FEBD seamless bridge deck connection plate and a construction method using a T-shaped shear nail structure, 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 present invention is: a FEBD seamless bridge deck connection plate constructed with T-type shear nails, including a semi-continuous UHPC bridge deck connection plate for spanning the upper side of the expansion gap at the end of the beam, 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-type shear nails are arranged between the polyurethane pavement layer and the semi-continuous UHPC bridge deck connection plate.

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

[0010] Furthermore, the semi-continuous UHPC bridge deck connection plate includes a plurality of 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 arranged between two adjacent UHPC blocks, each UHPC block and the expansion joint are connected in series via the corrugated steel bars, and a compressible elastic material is filled in the "T"-shaped expansion joint.

[0011] Furthermore, the UHPC blocks are prefabricated sections, with a non-bonding layer wrapped outside the corrugated steel bars, and the UHPC blocks located 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 paving 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, 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 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.

[0016] Furthermore, the T-shaped shear studs are evenly distributed in the transverse and longitudinal directions of the bridge.

[0017] A construction method of a FEBD seamless bridge deck connection plate using a T-shaped shear nail structure comprises the following steps: (1) In the factory, the required corrugated steel bars in 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 a compressible elastic material is filled in the "T"-shaped expansion joint, and holes are reserved in the compressible elastic material for the corrugated steel bars to pass through, and the processed corrugated steel bars are passed through the "T"-shaped expansion joint, and some steel bars are reserved on the outside; (3) Tie the T-type shear nails to the steel cage of the semi-continuous UHPC bridge deck connection plate, mix and cast the semi-continuous UHPC bridge deck connection plate; (4) Mix and pour the upper polyurethane pavement layer; (5) After leveling with epoxy mortar, lay a non-bonding layer on the main beam and position and install the UHPC prefabricated blocks on top; (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 steel cage of the original bridge deck in the longitudinal direction of the bridge; (7) Then, the formwork of the post-casting block is carried out, and the UHPC of the post-casting section is mixed, poured vertically and horizontally, and maintained; (8) After maintenance is completed, a section of polyurethane pavement is laid at both ends of the bridge deck connection plate to enhance its integrity, and then the ordinary bridge deck pavement layer can be laid.

[0018] Compared with the prior art, the present invention has the following advantages: 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.

[0019] 2. The FEBD seamless bridge deck connection plate absorbs the design concept of traditional expansion devices to adapt to the longitudinal deformation of the bridge, and combines the bridge deck connection plate, seamless expansion joints, etc. to make the bridge deck continuous and seamless. While adapting to the expansion and contraction deformation caused by the ambient temperature, it ensures that the bridge deck is continuous and seamless and driving is comfortable.

[0020] 3. The FEBD seamless bridge deck connection plate effectively improves the connection performance between the upper polyurethane pavement layer and the lower semi-continuous UHPC bridge deck connection plate, which can significantly reduce the pavement layer detachment and curling caused by the large deformation difference when the wheels run over the expansion joint. It better adapts to the complex spatial stress state of the bridge deck and meets the normal use requirements of the continuous structure of the bridge deck.

[0021] 4. The FEBD seamless bridge deck connection plate improves the shear resistance of the seamless bridge deck connection plate. By setting shear nails, the load on the upper part can be effectively dispersed and transferred to the lower connection plate, thereby effectively enhancing the shear resistance of the bridge deck connection plate.

[0022] 5. The FEBD seamless bridge deck connection plate has convenient construction performance. The bridge deck connection structure is simple, without complex steel bar connection structure. The special steel bar segment is prefabricated in the factory to achieve mass production. The FEBD seamless bridge deck connection plate prefabricated segment is prefabricated in the factory and hoisted to the site for installation. It is suitable for new bridge construction, eliminating the cumbersome process of chiseling and installing expansion joints, and the installation and equipment process is completed in one go. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of a traditional telescopic device; Figure 2 This is the structural diagram of the traditional bridge deck connection plate; Figure 3 This is a structural diagram of a seamless telescopic device; Figure 4 It is a schematic diagram of the combined telescopic device of the present invention; Figure 5 This is a schematic diagram of the FEBD seamless bridge deck connection plate structure of the present invention; Figure 6 This is a schematic diagram of the structure of a single seamless bridge deck connection plate of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of top view; In the figure: 1- polyurethane pavement layer 2- T-type shear nails 3- UHPC block 4- "T"-shaped expansion joint 5- corrugated steel bar. DETAILED DESCRIPTION

[0024] In order to make the above features and advantages of the present invention more easily understood, embodiments are given below with reference to the accompanying drawings for detailed description, but the present invention is not limited thereto.

[0025] refer to Figures 5 to 7 A FEBD seamless bridge deck connection plate constructed with T-shaped shear nails includes a semi-continuous UHPC bridge deck connection plate for spanning the upper side of the expansion gap at the end of the beam, a polyurethane pavement layer 1 for bearing vehicle loads is laid on the upper side of the semi-continuous UHPC bridge deck connection plate, and T-shaped shear nails 2 are arranged between the polyurethane pavement layer and the semi-continuous UHPC bridge deck connection plate. The T-shaped shear nails can achieve a tight combination between the upper polyurethane pavement layer and the lower semi-continuous UHPC bridge deck connection plate, prevent the pavement layer from being detached and thus failing, and form an integrated structure to improve its overall performance.

[0026] Due to the large difference in material properties between the upper and lower parts of the FEBD seamless bridge deck connection plate, the bonding performance between the two is poor, and the polyurethane pavement layer is easy to detach when bearing vehicle loads. Therefore, the T-type shear nail structure is between the two, the purpose is to enhance the connection strength between the upper and lower parts, prevent the upper pavement layer from detaching, and enhance the integrity.

[0027] In this embodiment, the polyurethane pavement layer is made of polyurethane asphalt, mineral powder, and quartz sand mixed in a certain proportion. In addition to the upper part of the bridge deck connection plate, the two ends of the polyurethane pavement layer also need to extend semi-continuous UHPC bridge deck connection 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 the polyurethane pavement layer from detaching.

[0028] In this embodiment, the semi-continuous UHPC bridge deck connection plate includes a plurality of UHPC blocks 3 arranged in sequence along the longitudinal bridge direction, the steel bars in the UHPC blocks are corrugated steel bars 5 with a certain curvature, a "T"-shaped expansion joint 4 is arranged between two adjacent UHPC blocks, each UHPC block and the expansion joint are connected in series through the corrugated steel bars, and a compressible elastic material with a large filling porosity and good deformation performance is filled in the "T"-shaped expansion joint. The horizontal expansion and contraction deformation of the main beam is absorbed through the "T"-shaped expansion joint.

[0029] UHPC materials have high strength, high crack resistance, high fatigue resistance and durability. They are mainly used to span the expansion gap at the end of the beam and provide vertical support to withstand wheel loads, while also withstanding the circumferential extrusion of the internal corrugated steel bars. Since each UHPC block is completely separated, the concrete stress can be fully released, so the stress is generally not large.

[0030] In this embodiment, the UHPC blocks are prefabricated sections. A non-bonding layer is wrapped outside the corrugated steel bars, and the UHPC blocks on both sides have reserved protruding steel bars in the longitudinal direction of the bridge.

[0031] In this embodiment, the corrugated steel bar is mainly used to connect each UHPC block and the "T"-shaped expansion joint, similar to a steel spring, so that each block and the expansion joint work together, so that each "T"-shaped expansion joint can evenly bear the temperature expansion and contraction deformation. The non-bonding layer material wrapped around the corrugated steel bar is generally made of a material with good elasticity and waterproof and anti-corrosion, which is mainly to achieve the non-bonding of the corrugated steel bar and the UHPC block, so that the corrugated steel bar can be relatively freely longitudinally compressed and stretched in the UHPC blocks on both sides of the expansion joint, releasing the stress of the steel bar.

[0032] In this embodiment, for on-site construction considerations, the compressible elastic material is integrated with the polyurethane paving layer to facilitate construction.

[0033] 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 connection plate, the large gap between the beam ends can be converted into a small expansion joint between the UHPC blocks, so that the expansion joint problem can be handled more simply and conveniently, and the bridge deck can be continuous and seamless (the bridge deck pavement layer is continuous and seamless).

[0034] In this embodiment, the compressible elastic material is rubber, silicone or polyurethane elastomer to prevent the deformation of the expansion joint from being reflected to the bridge deck pavement layer to avoid cracking of the bridge deck pavement layer. Specifically, polyurethane foam can be used.

[0035] 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 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.

[0036] In this embodiment, the T-shaped shear studs are evenly distributed in the transverse and longitudinal directions of the bridge.

[0037] FEBD seamless bridge deck connection plates are generally prefabricated in the factory and placed at the ends of the beams, and then cast into a whole with the main beams through reserved steel bars.

[0038] A construction method of a FEBD seamless bridge deck connection plate using a T-shaped shear nail structure comprises the following steps: (1) In the factory, the required corrugated steel bars in 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 a compressible elastic material is filled in the "T"-shaped expansion joint, and holes are reserved in the compressible elastic material for the corrugated steel bars to pass through, and the processed corrugated steel bars are passed through the "T"-shaped expansion joint, and some steel bars are reserved on the outside; (3) Tie the T-type shear nails to the steel cage of the semi-continuous UHPC bridge deck connection plate, mix and cast the semi-continuous UHPC bridge deck connection plate; (4) Mix and pour the upper polyurethane pavement layer; (5) After leveling with epoxy mortar, lay a non-bonding layer on the main beam and position and install the UHPC prefabricated blocks on top; (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 steel cage of the original bridge deck in the longitudinal direction of the bridge; (7) Then, the formwork of the post-casting block is carried out, and the UHPC of the post-casting section is mixed, poured vertically and horizontally, and maintained; (8) After maintenance is completed, a section of polyurethane pavement is laid at both ends of the bridge deck connection plate to enhance its integrity, and then the ordinary bridge deck pavement layer can be laid.

[0039] The above description is only a preferred embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, designing different forms of FEBD seamless bridge deck connection plates and construction methods using T-shaped shear nails does not require creative labor. Without departing from the principles and spirit of the present invention, all equal changes, modifications, substitutions and variations made within 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 comprises a semi-continuous UHPC bridge deck connection plate for spanning the upper side of the expansion gap at the end of the beam, a polyurethane paving 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 paving 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: Both ends of the polyurethane pavement layer extend semi-continuous UHPC bridge deck connection plates along the longitudinal direction of the bridge and extend above the bridge deck.

3. The FEBD seamless bridge deck connection plate with T-shaped shear nail structure according to claim 1 or 2, characterized in that: The semi-continuous UHPC bridge deck connection plate includes a plurality of 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 arranged between two adjacent UHPC blocks. Each UHPC block and the expansion joint are connected in series via the corrugated steel bars. A compressible elastic material is filled in the "T"-shaped expansion joint.

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 outside the corrugated steel bars, and 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 width of the "T"-shaped expansion joint is 2-3 cm.

7. The FEBD seamless bridge deck connection plate with T-shaped shear nail structure according to claim 4, 5 or 6, characterized in that: The compressible elastic material is rubber, silicone or polyurethane elastomer.

8. The FEBD seamless bridge deck connection plate with T-shaped shear nail structure according to claim 1, 2, 4, 5 or 6, characterized in that: A plurality of T-shaped shear nails are arranged 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 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.

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

10. A construction method for the FEBD seamless bridge deck connection plate with T-shaped shear nails as claimed in claim 3, characterized in that: The following steps are involved: (1) In the factory, the required corrugated steel bars in 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 a compressible elastic material is filled in the "T"-shaped expansion joint, and holes are reserved in the compressible elastic material for the corrugated steel bars to pass through, and the processed corrugated steel bars are passed through the "T"-shaped expansion joint, and some steel bars are reserved on the outside; (3) Tie the T-type shear nails to the steel cage of the semi-continuous UHPC bridge deck connection plate, mix and cast the semi-continuous UHPC bridge deck connection plate; (4) Mix and pour the upper polyurethane pavement layer; (5) After leveling with epoxy mortar, lay a non-bonding layer on the main beam and position and install the UHPC prefabricated blocks on top; (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 steel cage of the original bridge deck in the longitudinal direction of the bridge; (7) Then, the formwork of the post-casting block is carried out, and the UHPC of the post-casting section is mixed, poured vertically and horizontally, and maintained; (8) After maintenance is completed, a section of polyurethane pavement is laid at both ends of the bridge deck connection plate to enhance its integrity, and then the ordinary bridge deck pavement layer can be laid.

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