Large-deformation low-noise seamless expansion device suitable for bridge

Abstract

The utility model relates to the technical field of seamless expansion devices, and discloses a large-deformation low-noise seamless expansion device suitable for a bridge, a displacement box comprises two oppositely arranged box bodies which are respectively fixed on reinforcing steel bars bound at notch positions on two sides of an expansion joint, and a plurality of support beams are arranged in the two box bodies in parallel along the width direction of the bridge; the tops of the supporting beams support at least two sets of supporting profile steel. The supporting profile steel is located over the expansion joint, and the width of the expansion joint is not smaller than 240 mm. The PTFE sliding plate is arranged above the supporting profile steel, and the bottom of the PTFE sliding plate is of a displacement box and a poured concrete structure; the polyurethane elastomer is poured above the polytetrafluoroethylene sliding plate, an anti-fatigue spring is arranged in the polyurethane elastomer, the polyurethane elastomer is limited through a pre-buried anti-pulling non-shearing bolt, and the middle position of the polyurethane elastomer is supported through supporting profile steel; the utility model not only can ensure low noise, but also can be suitable for expansion joints with larger width.

Description

Technical Field

[0001] This utility model relates to the field of seamless expansion joint technology, and in particular to a low-noise seamless expansion joint suitable for large deformation of bridges. Background Technology

[0002] Currently, the most widely used expansion joints in the highway industry are modular expansion joints and comb-plate expansion joints. With the increasing mileage of urban elevated roads and expressways around cities, and the continuous increase in road traffic, traffic noise has become a significant issue affecting people's lives. This is especially true when vehicles pass through expansion joints, where the noise is particularly pronounced due to the high rigidity of the joints and the height difference between the two sides. Neither of the two commonly used expansion joint types mentioned above possesses noise reduction capabilities.

[0003] To address this issue, industry professionals have optimized and improved expansion joints. Seamless expansion joints utilize elastic expansion materials to achieve free expansion and contraction, resulting in a smooth, seamless road surface without vehicle bounce, ensuring safe and comfortable driving with reduced noise. They are increasingly being used in bridge construction where noise reduction is required. However, current elastic expansion joints can only be used for expansion joints with deformation amounts of ±80mm or less. Exceeding this deformation limit is currently not feasible, forcing many long-span bridges in cities to continue using noisier modular or comb-plate expansion joints. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a seamless expansion joint device with large deformation, low noise, suitable for bridges. It can effectively reduce the problem of high noise in the expansion joints of long-span bridges and long-connected bridges, while ensuring that the expansion joint device has the characteristics of safety, durability and convenient maintenance.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] A seamless, low-noise expansion joint suitable for large deformation bridges, comprising:

[0007] The displacement box consists of two opposing boxes, which are respectively fixed to the reinforcing bars tied at the slots on both sides of the expansion joint. Multiple support beams are arranged side by side along the width of the bridge inside the two boxes. At least two sets of support steel are supported on the top of the multiple support beams. The support steel is located directly above the expansion joint, and the width of the expansion joint is not less than 240mm.

[0008] The PTFE sliding plate is positioned above the supporting steel frame, with the displacement box and cast-in-place concrete structure at its base.

[0009] A polyurethane elastomer is cast on top of a PTFE sliding plate. An anti-fatigue spring is installed inside. The polyurethane elastomer is limited by pre-embedded pull-out but not shear bolts, and its middle position is supported by a supporting steel section.

[0010] As a further implementation, an anchor bolt is pre-embedded at the top position of the end of the slot away from the expansion joint, and the angle steel is fixed by the anchor bolt. The polyurethane elastomer is cast between the left and right angle steels.

[0011] As a further implementation, the fatigue-resistant springs are arranged in parallel along the length of the expansion joint and their ends are welded to the angle steel.

[0012] As a further implementation, the bottom end of the pull-out resistant but not shear resistant bolt is embedded in concrete, and the top end is located in a polyurethane elastomer.

[0013] As a further implementation, the PTFE slide plate has holes corresponding to the positions of the pull-out resistant but not shear resistant bolts, so that the pull-out resistant but not shear resistant bolts can pass through the holes.

[0014] As a further implementation, the pull-out resistant but not shear resistant bolts are arranged in multiple rows side by side along the width direction of the expansion joint.

[0015] As a further implementation, the multiple sets of supporting steel sections are spaced at the same distance, and waterstops are installed between the supporting steel sections. Waterstops are also installed between the supporting steel sections located on the side and the side beam steel sections at the top of the displacement box.

[0016] As a further implementation, the two ends of the support beam extend into the two boxes, and a clamping seat and a bearing seat are respectively provided above and below the ends of the support beam, and the support beam is set perpendicular to the support steel.

[0017] As a further implementation, the length of the PTFE slide plate is less than the distance between the left and right angle steels.

[0018] As a further implementation, the bottom ends of the pull-out resistant but not shear resistant bolts and the anchor bolts are fixed to the tied reinforcing bars.

[0019] The beneficial effects of this utility model are as follows:

[0020] 1. This utility model's large deformation, low noise, seamless expansion joint reduces noise by more than 10 decibels compared to conventional numerical expansion joints and comb-plate expansion joints. It also solves the problem that conventional polyurethane-filled expansion joints can only be applied to conventional small bridges. By increasing the length of the elastic body according to the deformation amount and adding corresponding supporting steel, it can be applied to expansion joints of 240mm and above, effectively reducing the noise problem of expansion joints in long-span bridges and large-span bridges. At the same time, it ensures that this expansion joint has the characteristics of safety, durability, and convenient maintenance.

[0021] 2. This utility model is equipped with a PTFE sliding plate structure, with the PTFE sliding plate facing upwards, which can effectively ensure the smooth deformation of the seamless telescopic device. Attached Figure Description

[0022] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0023] Figure 1 This is a structural diagram of a large deformation, low noise, seamless expansion joint device suitable for bridges in this embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional view of the location of the anti-fatigue spring in an embodiment of this utility model;

[0025] Figure 3 This is a top view of the low-noise seamless telescopic device in this embodiment of the utility model.

[0026] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0027] Among them: 1. Groove, 2. Angle steel, 3. Anchor bolt, 4. Reinforcing bar, 5. Polyurethane elastomer, 6. Pull-out resistant but not shear resistant bolt, 7. Displacement box, 71. Box body, 72. Pressure bearing seat, 73. Clamping seat, 8. Support beam, 9. Support steel, 10. Waterstop, 11. UHPC concrete, 12. Fatigue-resistant spring, 13. PTFE sliding plate. Detailed Implementation

[0028] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0029] Example 1

[0030] In a typical embodiment of this utility model, refer to Figures 1-3 As shown, a large deformation, low noise, seamless expansion joint suitable for bridges is provided at the U-shaped slot 1 formed between the ends of two sets of bridge main bodies, wherein the expansion joint is located at the middle of the bottom of the U-shaped slot 1.

[0031] like Figure 1 and Figure 2 As shown, the seamless expansion joint includes a displacement box 7, which includes two opposing box bodies 71, which are respectively fixed to the reinforcing bars 4 tied at the slot positions on both sides of the expansion joint. Specifically, the reinforcing bars 4 are tied between the bottom surface of the slot and the vertical inner side of the slot.

[0032] The two box-shaped sections 71 are U-shaped and opposite to each other, with their openings facing each other, allowing a displacement mechanism to be installed between the two openings. Specifically, the displacement mechanism includes multiple support beams arranged side by side along the width of the bridge within the two box-shaped sections. The length of the support beams 8 is perpendicular to the expansion joint, and their length is greater than the width of the expansion joint.

[0033] The support beam extends into the two housings at both ends, with a clamping seat 73 and a bearing seat 72 respectively located above and below the ends of the support beam. As the width of the expansion joint changes, the distance between the two housings 71 also changes, and the support beam 8 moves accordingly to adapt to the changes in the expansion joint.

[0034] The top of the two box bodies is provided with side beam steel at one end close to each other, and two sets of supporting steel 9 are provided between the two side beam steel. Multiple sets can also be provided. The corresponding number of supporting steel 9 can be selected according to the width of the expansion joint. It is necessary to ensure that the spacing between the supporting steel is the same to achieve uniform support for the upper structure.

[0035] like Figure 1 As shown, the supporting steel 9 is erected on multiple supporting beams 8. Therefore, the length direction of the supporting steel 9 is arranged along the length direction of the expansion joint and is located directly above the expansion joint.

[0036] A waterstop 10 is installed between the tops of the supporting steel sections, and a waterstop is also installed between the supporting steel sections on the side and the side beam steel sections on the top of the displacement box to achieve the purpose of waterproofing.

[0037] This embodiment, by setting multiple supporting steel sections 9, can achieve better support for the upper polyurethane elastomer corresponding to the expansion joint position, so that the device of this embodiment can meet the requirement that the expansion joint width is not less than 240mm. When the expansion joint width is large, the solution of this example can be adopted. While meeting the requirements of low noise, the seamless expansion device is also suitable for large deformation of bridges.

[0038] After the displacement box 7 is installed on the tied reinforcing bars 4, concrete, which is high-strength UHPC concrete 11, needs to be poured between its outer side and the groove.

[0039] The height of the UHPC concrete 11 pouring should be lower than the top of the trench to facilitate the subsequent installation of polyurethane elastomer to compensate for the height difference.

[0040] Specifically, anchor bolts 3 are pre-embedded at the top of the end of the groove 1 furthest from the expansion joint (the top of the vertical inner side of the groove). Angle steel 2 is fixed by anchor bolts 3. The bottom end of the anchor bolt 3 is anchored in the UHPC concrete 11, and the top end is used to fix angle steel 2 near the vertical inner side of the groove. The top end of angle steel 2 is flush with the top of the groove. The bottom end of the anchor bolt is fixed to the tied reinforcing bar 3.

[0041] like Figure 1As shown, the height of the supporting steel 9 is adapted to the bottom height of the angle steel 2. A polyurethane elastomer 5 is cast between the left and right angle steels 2, and an anti-fatigue spring 12 is installed inside the polyurethane elastomer 5. Figure 2 As shown, the fatigue-resistant springs 12 are arranged in parallel along the length of the expansion joint and their ends are welded and fixed to the angle steel 2 to improve the expansion and contraction recovery ability of the polyurethane elastomer.

[0042] To prevent the polyurethane elastomer 5 from arching upwards, the polyurethane elastomer 5 is limited by pre-embedded pull-out non-shear bolts 6. The bottom end of the pull-out non-shear bolts 6 is pre-embedded in the concrete, and the top end is located in the polyurethane elastomer, which can effectively prevent the polyurethane elastomer 5 from arching upwards.

[0043] like Figure 3 As shown, multiple rows of pull-out but not shear-resistant bolts 6 are arranged side by side along the width of the expansion joint to better limit the polyurethane elastomer 5. The polyurethane elastomer 5 can deform freely in the longitudinal direction, but will not arch.

[0044] When arranging the pull-out non-shear bolts 6, the bottom end of the pull-out non-shear bolts 6 can be welded to the reinforcing bar 4 for fixation, and then UHPC concrete 11 can be poured. The top end of the pull-out non-shear bolts 6 is lower than the height of the angle steel 2.

[0045] The purpose of the supporting steel 9 in this embodiment is to support the polyurethane elastomer 5 at the expansion joint location, enabling the device to adapt to expansion joint structures with a width of not less than 240mm. Furthermore, it can prevent vehicles from sinking or bouncing under the condition of a large-width expansion joint.

[0046] To prevent excessive friction between the UHPC concrete 11 and the polyurethane elastomer 5 during expansion joint changes, a PTFE sliding plate 13 is installed on top of the UHPC concrete 11. Figure 1 As shown, the PTFE sliding plate 13 is arranged between the bottom ends of the angle steel 2, and its middle position is supported by the supporting steel 9. The bottom surface of the PTFE sliding plate 13 is also in contact with the UHPC concrete 11.

[0047] After the UHPC concrete 11 is poured, the PTFE sliding plate 13 is then arranged. The polyurethane elastomer is poured on top of the PTFE sliding plate. The PTFE sliding plate 13 serves to isolate the UHPC concrete 11 from the polyurethane elastomer 5, which can ensure smoother deformation and ensure the structural stability of the seamless expansion joint.

[0048] Since the pull-out non-shear bolts 6 are anchored after the UHPC concrete 11 is poured, holes are provided on the PTFE sliding plate corresponding to the positions of the pull-out non-shear bolts. This allows the pull-out non-shear bolts to pass through the holes when the PTFE sliding plate 13 is arranged. The hole size is larger than the pull-out non-shear bolts 6, so that the pull-out non-shear bolts 6 and the PTFE sliding plate 13 will not interfere with each other when the expansion joint changes.

[0049] Understandably, the PTFE sliding plate faces upward to ensure smooth deformation. The length of the PTFE sliding plate is less than the distance between the left and right angle steels to ensure that there is no interference between the PTFE sliding plate and the angle steel when the expansion joint changes.

[0050] The large deformation, low noise, seamless expansion joint of this embodiment reduces noise by more than 10 decibels compared to conventional numerical expansion joints and comb-plate expansion joints. It also solves the problem that conventional polyurethane-filled expansion joints can only be applied to conventional small bridges. By increasing the length of the elastic body according to the amount of deformation and adding corresponding supporting steel, it can be applied to expansion joints of 240mm and above, effectively reducing the noise problem of expansion joints in long bridges and large-span bridges. At the same time, it ensures that this expansion joint has the characteristics of safety, durability and convenient maintenance.

[0051] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A seamless, low-noise expansion joint suitable for large deformation bridges, characterized in that, include: The displacement box consists of two opposing boxes, which are respectively fixed to the reinforcing bars tied at the slots on both sides of the expansion joint. Multiple support beams are arranged side by side along the width of the bridge inside the two boxes. At least two sets of support steel are supported on the top of the multiple support beams. The support steel is located directly above the expansion joint, and the width of the expansion joint is not less than 240mm. The PTFE sliding plate is positioned above the supporting steel frame, with the displacement box and cast-in-place concrete structure at its base. A polyurethane elastomer is cast on top of a PTFE sliding plate. An anti-fatigue spring is installed inside. The polyurethane elastomer is limited by pre-embedded pull-out but not shear bolts, and its middle position is supported by a supporting steel section.

2. The seamless, low-noise expansion joint suitable for bridges with large deformation as described in claim 1, characterized in that, An anchor bolt is pre-embedded at the top of the slot away from the expansion joint, and the angle steel is fixed by the anchor bolt. The polyurethane elastomer is cast between the left and right angle steels.

3. A seamless, low-noise expansion joint suitable for bridges with large deformation, as described in claim 2, is characterized in that... The fatigue-resistant springs are arranged in parallel along the length of the expansion joint and their ends are welded to the angle steel.

4. A seamless, low-noise expansion joint suitable for bridges with large deformation, as described in claim 1, is characterized in that... The bottom end of the pull-out resistant but not shear resistant bolt is embedded in the concrete, and the top end is located in the polyurethane elastomer.

5. A seamless, low-noise expansion joint suitable for bridges with large deformation, as described in claim 4, is characterized in that... The PTFE slide plate has holes corresponding to the positions of the pull-out resistant but not shear resistant bolts, so that the pull-out resistant but not shear resistant bolts can pass through the holes.

6. A seamless, low-noise expansion joint suitable for bridges with large deformation, as described in claim 5, is characterized in that... The pull-out resistant but not shear resistant bolts are arranged in multiple rows along the width of the expansion joint.

7. A seamless, low-noise expansion joint suitable for bridges with large deformation, as described in claim 1, characterized in that, The multiple sets of supporting steel sections are spaced at the same distance, and waterstops are installed between the supporting steel sections. Waterstops are also installed between the supporting steel sections located on the side and the side beam steel sections at the top of the displacement box.

8. A seamless, low-noise expansion joint suitable for bridges with large deformation, as described in claim 7, is characterized in that... The support beam extends into the two boxes at both ends, and a clamping seat and a bearing seat are respectively provided above and below the ends of the support beam. The support beam is perpendicular to the support steel.

9. A seamless, low-noise expansion joint suitable for bridges with large deformation, as described in claim 2, is characterized in that... The length of the PTFE sliding plate is less than the distance between the left and right angle steels.

10. A seamless, low-noise expansion joint suitable for bridges with large deformation, as described in claim 2, characterized in that, The bottom ends of the pull-out resistant but not shear resistant bolts and the anchor bolts are fixed to the tied reinforcing bars.

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