An implicit single-panel expansion joint and its construction method

Abstract

This invention discloses a concealed single-panel telescopic device and its construction method, including a fixed concealed box. The fixed concealed box consists of a straight section and an inclined section. The acute angle between the inclined section and the horizontal direction is between 0 and 15 degrees. It is pre-embedded in the end of a beam on one side. A debris groove is provided between the straight sections adjacent to the fixed concealed box. One end of the cross-joint plate is comb-shaped, with each comb tooth inserted into the corresponding fixed concealed box. The other end is anchored to the end of the beam on the other side by anchor bolts. One end of the elastic composite plate is also provided with a debris cleaning shovel. This invention improves the structure of the traditional steel comb-tooth plate telescopic device by introducing a fixed concealed box structure. The comb teeth of the cross-joint plate can slide freely in the fixed concealed box, while the comb teeth can be constrained and limited to avoid uneven road surfaces caused by the comb teeth warping or deformation. The debris cleaning shovel is integrally formed with the elastic composite plate and is opposite to the debris groove. When the elastic composite plate extends or retracts, the debris cleaning shovel is inserted into the debris groove to facilitate the discharge of debris.

Description

Technical Field

[0001] This invention relates to the field of bridge expansion joint construction technology, and in particular to a concealed single-plate expansion joint device and its construction method. Background Technology

[0002] Bridge expansion joints are typically installed at discontinuous sections at the ends of beams, directly bearing the repeated impacts of wheel loads and exposed to the atmosphere for extended periods. The harsh operating environment makes them highly susceptible to damage, which can lead to breakage of the expansion joints and consequently, damage to the bridge deck and beams. Therefore, bridge expansion joints must possess excellent durability, waterproofing, driving comfort, and ease of construction.

[0003] Commonly used bridge expansion joints mainly include comb-plate type and modular type. This is because the complex and harsh working environment demands that the expansion joint be as simple as possible while also prioritizing durability. Due to the harsh working environment, existing steel comb-plate type expansion joints often experience problems such as anchor bolt pull-out, shearing, and comb tooth warping, affecting traffic safety. Modular expansion joints are heavier, have a more complex structure than comb-plate type, require higher installation standards, and are more difficult to construct, often resulting in problems such as crossbeam breakage and damage to the distribution beam support. Furthermore, existing expansion joints basically consist of two main parts: the joint section and the anchoring section. Because the joint body has two components, the road surface and the joint body must be aligned and leveled during installation, requiring high construction standards. During operation, both parts of the joint body require maintenance, increasing the workload. At the same time, dust and sand easily accumulate in the gaps between the comb teeth. If the accumulated debris is not removed in time, it can easily cause the expansion joint to malfunction or be damaged. Therefore, regular cleaning and maintenance are necessary, consuming a significant amount of manpower. Summary of the Invention

[0004] To address the inherent problems of existing (commonly used) expansion joints, this invention provides an implicit single-plate expansion joint and its construction method.

[0005] For the first time, the structure of a two-part expansion joint has been simplified into a single plate, making construction, installation, operation, and maintenance simple, easy, and economical. The elastic composite plate's stiffness can be adjusted by changing the thickness of the steel plate to adapt to different joint widths and operational loads. The comb-tooth portion of the elastic composite plate uses a pure elastic body, which reduces vibration and noise while allowing for displacement and seamless matching with fixed junction boxes, facilitating installation and providing excellent durability.

[0006] This invention is the first to propose a pre-embedded fixed box structure. The fixed box can be embedded in concrete or a composite layer of asphalt and concrete, requiring no maintenance, exhibiting low structural stress, and eliminating the need for an anchoring system. It reduces the contact length between the wheel and the telescopic device, thus lowering driving noise. It also avoids the secondary noise problems caused by uneven matching between the joint plate and the fixing plate in conventional comb-plate telescopic devices.

[0007] For the first time, a debris removal shovel structure was proposed, which can remove debris in a timely manner during the operation of the sewing machine, making it easier to remove debris and reducing the workload of daily maintenance of the sewing machine.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] An implicit single-board telescopic device, comprising:

[0010] A fixed junction box, which consists of a straight section and an inclined section. The acute angle between the inclined section and the horizontal direction is between 0 and 15 degrees, and it is pre-embedded in the end of a beam on one side.

[0011] The debris trough is located at one end of a beam and between the straight sections of adjacent fixed boxes; the debris trough consists of the straight section of the fixed box and a partition plate, and the partition plate is welded to the side plate of the fixed box.

[0012] The elastic composite panel has a comb-shaped end, with each comb tooth inserted into a corresponding fixed box. The other end is anchored to the beam end on the other side by the anchor bolt. One end of the elastic composite panel is also provided with a debris cleaning shovel, which is integrally formed with the elastic composite panel. The debris cleaning shovel is opposite to the debris trough. When the elastic composite panel extends or retracts, the debris cleaning shovel is inserted into the debris trough.

[0013] Further technology of the present invention:

[0014] Preferably, the comb teeth of the elastic composite plate are flexible structures, and the bottom of the elastic composite plate has a cavity with a built-in steel plate that spans the gap at the beam end.

[0015] Preferably, a stainless steel sliding plate is provided above one end of the beam and located below the elastic composite plate, and the stainless steel sliding plate is in contact with the steel plate.

[0016] Preferably, the top surface of the debris cleaning shovel is inclined, with the side connected to the elastic composite plate being higher than the other side. When there is a lot of debris in the debris trough, the inclined debris cleaning shovel will scrape the debris out of the debris trough, which can effectively prevent the toothed plate from jamming.

[0017] Preferably, the other beam end is provided with a groove, a threaded sleeve is pre-embedded in the groove of the beam body, and an anchor bolt is provided on the elastic composite plate and screwed into the threaded sleeve.

[0018] Preferably, the lower end of the threaded sleeve has a hole to which a reinforcing bar is inserted, and the reinforcing bar is spot-welded to the pre-embedded reinforcing bar at the other end of the beam for fixation.

[0019] Preferably, the elastic composite plate is provided with stress relief grooves, which are located between the anchor bolts.

[0020] Preferably, the fixed junction box is fixed by welding with positioning steel bars and pre-embedded steel bars at one side beam end.

[0021] The preferred construction method includes the following steps:

[0022] Step (1): Accurately mark the installation position of the expansion device at the groove position of the beam end where the expansion device needs to be installed, draw the cutting line, and clean it up;

[0023] Step (2): Assemble and fix the junction box and the isolation plate:

[0024] a. Assemble and position the matching flexible composite board with the fixed junction box and isolation plate;

[0025] b. Insert the anchor bolts and threaded sleeves into the holes of the elastic composite plate;

[0026] d. Determine the length of the bottom positioning steel bar of the fixed junction box according to the angle of the inclined section of the fixed junction box. After determining the length of the positioning steel bar, weld the fixed junction box to the positioning steel bar.

[0027] Step (3): Weld the positioning steel bar below the fixed box to the pre-embedded steel bar in the groove. After fixing, align the elastic composite plate with the fixed box again to ensure that the straight section of the fixed box is horizontal and flush with the road surface on both sides, and that the comb teeth of the elastic composite plate slide freely in the fixed box.

[0028] Step (4): Make templates according to the shape of the telescopic device and the actual size of the slot, and install them firmly to ensure that the gaps between the templates are tight;

[0029] Step (5): After the template is positioned and fixed, apply adhesive to the top two sides of the water guiding structure and press it onto the template, and fix it with nails. Control the fit between the water guiding structure and the template to keep it flat and not bend it before pouring concrete.

[0030] Step (6): Adjust the elevation and level of the elastic composite panel, and keep the top surface of the elastic composite panel flush with the road surface on both sides;

[0031] Step (7): After the telescopic device is leveled, weld and fix the threaded sleeve to the pre-embedded steel bar in the groove;

[0032] Step (8): Use fine stone concrete and pour it simultaneously on both sides in the longitudinal direction. During the pouring process, vibration should be strengthened to ensure that the concrete at the bottom of the expansion joint is dense and flat.

[0033] Step (9): When the concrete strength is not less than 75% of the design strength, rotate the elastic composite plate outward by 15° to check the concrete pouring quality;

[0034] Step (10): The concrete surface should be flat and dense, without defects, hollow areas or holes. Otherwise, it should be repaired. After the quality inspection is qualified, the elastic composite board is reset.

[0035] Step (11): Apply thread-locking adhesive to the anchor bolts, adjust the torque of the electric wrench to the lowest setting, and screw in the anchor bolts; then adjust the torque of the electric wrench to the predetermined value and tighten the anchor bolts. Each anchor bolt should be subjected to uniform force.

[0036] Step (12): Fill and seal the anchor bolt holes with elastic asphalt sealant. The elastic asphalt sealant should be flush with the surface of the expansion joint.

[0037] Step (13): The concrete in the groove should be cured.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0039] By introducing a fixed junction box structure, the comb teeth of the elastic composite board are made of pure elastomers, which can reduce vibration and noise while allowing for displacement and seamless matching with the fixed junction box, making it easy to install and durable.

[0040] The fixed junction box design reduces the contact length between the wheels and the telescopic device, thus reducing driving noise. Stress relief grooves between the anchor bolts reduce stress concentration between the anchor bolts and the elastic composite plate.

[0041] The elastic composite plate, through its own elastic deformation, meets the multi-directional displacement requirements of bridge beam ends, including horizontal, vertical, and torsional displacements. The built-in steel plate increases the span capacity, enhances the stiffness of expansion joints, and ensures structural safety.

[0042] The debris removal shovel can clean debris from the gaps during the operation of the seam, removing debris in a timely manner and facilitating its removal without affecting the expansion and contraction of the elastic composite board, thus reducing the workload of daily maintenance of the seam.

[0043] A novel concealed single-panel telescopic device has been created, which does not require large construction machinery, can be constructed quickly, and is suitable for widespread application. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0046] Figure 2 This is a schematic diagram of the fixed dark box of the present invention;

[0047] Figure 3 This is a schematic diagram of the fixed dark box and the elastic composite plate in the combined state of the present invention;

[0048] Figure 4 for Figure 3 Top view of the structure;

[0049] Figure 5 This is a schematic diagram of the threaded sleeve structure of the present invention;

[0050] The numbers in the above diagram are: 1-Fixed junction box, 1a-Straight section of fixed junction box, 1b-Inclined section of fixed junction box, 2-Elastic composite plate, 3-Built-in steel plate, 4-Isolation plate, 5-Stainless steel sliding plate, 6-Positioning steel bar, 7-Anchor bolt, 8-Threaded sleeve, 9-Stress relief groove, 10-Comb teeth, 11-Groove concrete, 12-Groove embedded steel bar, 13-Cutting line, 14-Debris groove, 15-Debris cleaning shovel, 16-Opening, 17-Steel bar. Detailed Implementation

[0051] To make the technical means, creative features, achieved objectives, and effects of this invention readily understandable, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the invention.

[0052] Example 1: As Figure 1-2 As shown, a concealed single-panel telescopic device consists of a fixed concealed box 1, an elastic composite plate 2, an internal steel plate 3, an isolation plate 4, a stainless steel sliding plate 5, a positioning steel bar 6, an anchor bolt 7, a threaded sleeve 8, and a stress relief groove 9.

[0053] The fixed junction box 1 is made of stainless steel plate with a thickness of 6mm. The fixed junction box consists of a straight section 1a and an inclined section 1b. The inclined section 1b is pre-embedded at 15 degrees at one end of the beam. The straight section 1a is flush with the road surface.

[0054] One end of the elastic composite plate 2 is a comb tooth 10, each comb tooth 10 is inserted into the corresponding fixed box 1, and the other end is anchored to the beam end on the other side by the anchor bolt 7.

[0055] The comb teeth 10 of the elastic composite plate 2 are flexible structures. The elastic composite plate 2 has a built-in steel plate 3, and the built-in steel plate 3 is installed in the elastic composite plate 2, spanning the beam end gap.

[0056] Anchor bolt 7 is a high-strength bolt;

[0057] The stainless steel sliding plate 5 is positioned above the beam on one side of the fixed junction box 1 and below the elastic composite plate 2.

[0058] The threaded sleeve 8 is pre-embedded in the groove of the beam. After the expansion joint is installed, the anchor bolt 7 is screwed into the threaded sleeve 8. The lower end of the threaded sleeve 8 has a hole 16, through which the reinforcing bar 17 is inserted. The reinforcing bar is spot-welded to the pre-embedded reinforcing bar 12 in the groove of the beam for fixation.

[0059] The stress relief groove 9 is set on the elastic composite plate 2 between the anchor bolts 7, which can reduce the stress concentration between the anchor bolts 7 and the elastic composite plate 2.

[0060] The fixed junction box 1 is fixed by welding the positioning steel bar 6 and the pre-embedded steel bar 12 in the beam groove.

[0061] By introducing a fixed junction box structure, the comb teeth of the elastic composite board are made of pure elastomers, which can reduce vibration and noise while allowing for displacement and seamless matching with the fixed junction box, making it easy to install and durable.

[0062] Example 2, as Figure 1-4 Based on Example 1, in order to ensure the expansion and contraction of the elastic composite panel, an expansion gap is left between the elastic composite panel and the fixed box. The gap is small and only needs to meet the expansion and contraction requirements. However, the small gap still poses the risk of debris accumulating and affecting the expansion and contraction. To address this, this example adds a debris cleaning structure for the gap, aiming to ensure that debris does not affect the expansion and contraction of the elastic composite panel.

[0063] The debris trough 14 is located at one end of a beam and between adjacent straight sections 1a of fixed boxes; the debris trough 14 is composed of the straight section 1a of the fixed box and an isolation plate 4, and the isolation plate 4 is welded to the side plate of the fixed box 1.

[0064] One end of the elastic composite plate 2 is also provided with a debris cleaning shovel 15, which is integrally formed with the elastic composite plate 2. The debris cleaning shovel 15 is opposite to the debris trough 14. When the elastic composite plate 2 extends or retracts, the debris cleaning shovel 15 is inserted into the debris trough 14.

[0065] The top of the debris trough 14 is provided with an opening, and the top surface of the debris cleaning shovel 15 is inclined, with the side connected to the elastic composite plate 2 being higher. The debris cleaning shovel 15 is inserted into the debris trough 14 to squeeze the debris out from the top opening of the debris trough 14.

[0066] The construction method includes the following steps:

[0067] Step (1): At the position of the beam end groove where the expansion device needs to be installed, accurately mark the installation position of the expansion device, draw the cutting line 13, and clean it up;

[0068] Step (2): Assemble and fix the dark box 1 and the isolation plate 4:

[0069] a. Align and position the matching elastic composite board 2 with the fixed dark box 1;

[0070] b. Insert the anchor bolt 7 and threaded sleeve 8 into the hole of the elastic composite plate 2;

[0071] d. Based on the angle of the inclined section 1b of the fixed box, determine the length of the bottom positioning steel bar 6 of the fixed box 1. After determining the length of the positioning steel bar 6, weld the fixed box 1 to the positioning steel bar 6.

[0072] Step (3): Weld the positioning steel bar 6 below the fixed box 1 to the pre-embedded steel bar 12 in the groove. After fixing, align the elastic composite plate 2 with the fixed box 1 again to ensure that the straight section 1a of the fixed box is horizontal and flush with the road surface on both sides, and that the comb teeth 13 of the elastic composite plate 2 can slide freely in the fixed box 1.

[0073] Step (4): Make templates according to the shape of the telescopic device and the actual size of the slot, and install them firmly to ensure that the gaps between the templates are tight;

[0074] Step (5): After the template is positioned and fixed, apply adhesive to the top two sides of the water guiding structure and press it onto the template. The width of the water guiding structure on the inside of the template should not be less than 40mm, and it should be fixed with nails. The water guiding structure should be kept flat and should not be bent or inserted into the concrete after pouring.

[0075] Step (6): Adjust the elevation and level of the elastic composite board 2, and keep the top surface of the elastic composite board 2 flush with the road surface on both sides;

[0076] Step (7): After the telescopic device is leveled, weld and fix the threaded sleeve 8 to the pre-embedded steel bar 12 in the groove.

[0077] Step (8): Use fine stone concrete and pour it simultaneously on both sides in the longitudinal direction. During the pouring process, vibration should be strengthened to ensure that the concrete at the bottom of the expansion joint is dense and flat.

[0078] Step (9): When the concrete strength is not less than 75% of the design strength, rotate the elastic composite plate 2 outward by 15° to check the concrete pouring quality.

[0079] Step (10): The concrete surface should be flat and dense, without defects, hollow areas, holes, etc.; otherwise, it should be repaired. After the quality inspection is qualified, the elastic composite board 2 is reset.

[0080] Step (9): Apply thread-locking adhesive to the anchor bolt 7, adjust the torque of the electric wrench to the lowest setting, and screw in the anchor bolt 7; then adjust the torque of the electric wrench to the predetermined value and tighten the anchor bolt 7. Each anchor bolt 7 should be subjected to uniform force.

[0081] Step (10): Fill and seal the anchor bolt holes with elastic asphalt sealant. The elastic asphalt sealant should be flush with the surface of the expansion joint.

[0082] Step (11): The concrete 11 at the groove should be cured.

[0083] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The descriptions in the foregoing invention and specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A concealed single-board telescopic device, characterized in that, include: A fixed junction box, which consists of a straight section and an inclined section. The acute angle between the inclined section and the horizontal direction is between 0 and 15 degrees, and it is pre-embedded in the end of a beam on one side. The debris trough is located at one end of a beam and between the straight sections of adjacent fixed boxes; the debris trough consists of the straight section of the fixed box and a partition plate, and the partition plate is welded to the side plate of the fixed box. The elastic composite panel has a comb-shaped end, with each comb tooth inserted into a corresponding fixed box. The other end is anchored to the beam end on the other side by anchor bolts. One end of the elastic composite panel is also provided with a debris cleaning shovel, which is integrally formed with the elastic composite panel. The debris cleaning shovel is opposite to the debris trough. When the elastic composite panel extends or retracts, the debris cleaning shovel is inserted into the debris trough.

2. The implicit single-board telescopic device according to claim 1, characterized in that, The comb teeth of the elastic composite plate are flexible, and the bottom of the elastic composite plate has a cavity with a steel plate inside, which spans the gap at the beam end.

3. The implicit single-board telescopic device according to claim 2, characterized in that, A stainless steel sliding plate is provided above one side of the beam end and is located below the elastic composite plate. The stainless steel sliding plate is in contact with the steel plate.

4. The implicit single-board telescopic device according to claim 1, characterized in that, The top surface of the debris cleaning shovel is inclined, with the side connected to the elastic composite plate being higher than the other side. The debris cleaning shovel squeezes the debris into the debris groove, which can effectively prevent the toothed plates from jamming together.

5. The implicit single-board telescopic device according to claim 1, characterized in that, The other side of the beam end is provided with a groove, and a threaded sleeve is pre-embedded in the groove of the beam body. An anchor bolt is provided on the elastic composite plate and screwed into the threaded sleeve.

6. The implicit single-board telescopic device according to claim 5, characterized in that, The threaded sleeve has a hole at its lower end, through which a reinforcing bar is inserted, and the reinforcing bar is spot-welded to the pre-embedded reinforcing bar at the other end of the beam for fixation.

7. The implicit single-board telescopic device according to claim 1, characterized in that, The elastic composite plate is provided with stress relief grooves, which are located between the anchor bolts.

8. The implicit single-board telescopic device according to claim 1, characterized in that, The fixed junction box is fixed by welding with positioning steel bars and pre-embedded steel bars on one side of the beam end.

9. A concealed single-board telescopic device according to any one of claims 1-8, characterized in that, The construction method includes the following steps: Step (1): Accurately mark the installation position of the expansion device at the groove position of the beam end where the expansion device needs to be installed, draw the cutting line, and clean it up. Step (2): Assemble and fix the junction box and the isolation plate: a. Assemble and position the matching flexible composite board with the fixed junction box and isolation plate; b. Insert the anchor bolts and threaded sleeves into the holes of the elastic composite plate; d. Determine the length of the bottom positioning steel bar of the fixed junction box based on the angle of the inclined section of the fixed junction box. After determining the length of the positioning steel bar, weld the fixed junction box to the positioning steel bar. Step (3): Weld the positioning steel bar below the fixed box to the pre-embedded steel bar in the groove. After fixing, align the elastic composite plate with the fixed box again to ensure that the straight section of the fixed box is horizontal and flush with the road surface on both sides, and that the comb teeth of the elastic composite plate slide freely in the fixed box. Step (4): Make templates according to the shape of the telescopic device and the actual size of the slot, and install them firmly to ensure that the gaps between the templates are tight; Step (5): After the template is positioned and fixed, apply adhesive to the top two sides of the water guiding structure and press it onto the template, and fix it with nails. Control the water guiding structure to keep it flat and not bend it before pouring concrete. Step (6): Adjust the elevation and level of the elastic composite panel, and keep the top surface of the elastic composite panel flush with the road surface on both sides; Step (7): After the telescopic device is leveled, weld and fix the threaded sleeve to the pre-embedded steel bar in the groove. Step (8): Use fine stone concrete and pour it simultaneously on both sides in the longitudinal direction. During the pouring process, vibration should be strengthened to ensure that the concrete at the bottom of the expansion joint is dense and flat. Step (9): When the concrete strength is not less than 75% of the design strength, rotate the elastic composite plate outward by 15° to check the concrete pouring quality; Step (10): The concrete surface should be flat and dense, without defects, hollow areas or holes; otherwise, it should be repaired. After the quality inspection is qualified, the elastic composite board is reset. Step (11): Apply thread-locking adhesive to the anchor bolts, adjust the torque of the electric wrench to the lowest setting, and screw in the anchor bolts; then adjust the torque of the electric wrench to the predetermined value and tighten the anchor bolts. Each anchor bolt should be subjected to uniform force. Step (12): Fill and seal the anchor bolt holes with elastic asphalt sealant. The elastic asphalt sealant should be flush with the surface of the expansion joint. Step (13): The concrete in the groove should be cured.

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