Durable noise-reduction pi-shaped steel multidirectional displacement bridge expansion device and mounting method

Abstract

The invention relates to the field of bridge expansion devices, in particular to a durable noise-reduction pi-shaped steel multidirectional displacement bridge expansion device and a mounting method. The durable noise-reduction pi-shaped steel multidirectional displacement bridge expansion device comprises sliding side integral edge beams (2) and fixed side integral edge beams (7) which are located on the two sides of an expansion joint preformed groove and arranged in a staggered and matched mode, and is characterized in that displacement supports (4) are arranged below the sliding side integral edge beams (2), and the multidirectional displacement function of the expansion device can be achieved through the displacement supports (4); the durable noise-reduction pi-shaped steel multi-directional displacement bridge expansion device is arranged on the two sides of an expansion joint, and the lengths of grouting concrete parts of structures on the two sides of the expansion joint are different, namely, one side is long, and the other side is short.

Description

TECHNICAL FIELD

[0001] The application relates to the field of bridge expansion joints, in particular to a durable noise-reducing pi-shaped steel multi-directional displacement bridge expansion joint and an installation method. BACKGROUND

[0002] The noise of the expansion joint is mainly caused by the vertical vibration excitation induced by the vehicle load and the acoustic mode excitation of the cavity under the expansion joint. When the vehicle passes through, the mid-beam is subjected to vertical bending or torsional vibration due to impact, which excites the air column resonance in the cavity, forming low-frequency noise (the main frequency band is below 400 Hz). This coupling effect also exists in the comb plate expansion joint, and because the gap between the comb plates is large, the wheel is suspended for a moment and then impacts the other side of the profiled steel, causing local stress concentration and further amplifying the noise.

[0003] The sealing strip of the traditional rubber expansion joint is prone to hardening and cracking under long-term ultraviolet radiation and rainwater erosion. After the gap increases, the vehicle passing through will produce "hard impact" impact. When the vehicle passes through the expansion joint at high speed, the air in the gap is quickly compressed and released, producing pneumatic noise. In addition, the gap between the comb plates causes local deformation of the tire, and the friction between the tire and the edge of the profiled steel forms a pressure pulse, further intensifying the noise. For example, the modular expansion joint of the SR 520 Bridge in Washington State produces noise due to the extrusion of the tire into the beam joint, which is tested to be significantly higher than the background value 160 feet away. In heavy traffic or heavy load sections, if a rubber expansion joint with insufficient bearing capacity is selected, vibration noise may occur due to material fatigue.

[0004] The concrete cavity causes the comb plate to lose effective support and to be locally sunken or warped under the action of the vehicle load. For example, the comb plate fracture of the Jining Kaixi Bridge caused by the concrete cavity formed a pit, and the vehicle passing through was severely jolted. A bridge was forced to close the lane for emergency repair due to the complete detachment of the comb plate at the lower part caused by the cavity and the damage of the beam roof. The cavity allows water and salt to directly penetrate into the concrete, accelerating the corrosion and expansion of the anchoring steel, and eventually causing the concrete cover to peel off. After the expansion joint fails, rainwater erodes the support and the bent cap for a long time, inducing the aging of the support rubber and the corrosion of the bent cap steel, shortening the overall service life of the bridge.

[0005] The cavity causes the "hollow drum" effect between the comb plate and the concrete, and the impact energy cannot be effectively absorbed, so the vibration is transmitted to the surrounding environment through the beam, and the noise decibel is significantly increased. The noise value of the comb plate expansion joint of the Chengdu Second Ring Elevated Bridge reached 90 decibels before the reconstruction, and was alleviated after the reconstruction by using the elastomer seamless expansion joint. The concrete cavity needs to be frequently repaired, and the traditional repair method (such as chiseling and pouring ordinary concrete) has poor durability. For example, the annual maintenance cost of a bridge increases by 30% due to the cavity problem, and although the use of high-strength non-shrinkage grouting material can prolong the service life, the single cost is 2-3 times that of ordinary materials.

[0006] In the installation of bridge expansion joints, "leveling" is one of the core processes - it is necessary to ensure that the top surface of the expansion joint profile steel is consistent with the height of the bridge pavement (or road surface), and the connection is smooth, and meets the displacement function of the expansion joint. If the leveling is difficult and the precision is not up to standard, it will cause a series of chain problems.

[0007] The core harm of insufficient leveling precision is to destroy the "force balance", which directly threatens the safety of the bridge structure: when there is a height difference between the expansion joint and the beam body, abutment or road surface, the local stress concentration will occur when the vehicle load (especially heavy trucks) passes through - the profile steel, anchor reinforcement, and rubber sealing strip of the expansion joint will bear impact load far exceeding the design value, prone to profile steel cracking, anchor reinforcement loosening or pulling out, and sealing strip tearing; stress concentration will further conduct to the beam body and abutment: cracks may occur at the beam end due to uneven stress, and the abutment support may fail prematurely due to repeated impact, which will lead to long-term accumulation of beam settlement, abutment displacement, and even deformation of the overall structure of the bridge, and in severe cases, may cause safety accidents (such as expansion joint falling off, beam end collapse).

[0008] The most direct impact of poor leveling is "uneven connection", which directly affects the passing vehicles and drivers: poor driving experience: the height difference between the expansion joint and the road surface will cause the vehicle to "jump" and "bump", especially when driving at high speed, the bumping feeling is strong; at the same time, the impact of the tire and the profile steel will produce continuous "clatter" noise (up to 70-90 decibels), forming noise pollution, affecting the comfort of driving and the lives of surrounding residents. High risk of traffic safety: bumping will reduce the controllability of the vehicle: small cars are prone to direction deviation due to jumping, and heavy trucks are prone to "tail swing", especially in rainy and snowy weather (wet road surface), which is easy to cause rear-end and rollover accidents; tire wear is accelerated: repeated impact will cause uneven wear of the tire tread, and even the risk of bulging and tire burst, increasing vehicle maintenance costs and driving risks.

[0009] Insufficient leveling accuracy will directly damage the "sealing and protection" and "displacement function" of expansion joints, accelerating component aging and bridge deterioration: Protection failure leads to increased corrosion: If gaps exist after leveling (such as poor sealing between the expansion joint and the road surface), rainwater, snowmelt, road sewage (containing salt and oil), and debris such as sand and garbage will seep into the expansion joint, directly corroding the steel (rusting and thinning), rubber sealing strips (aging and cracking), supports (rusting failure), and beam reinforcement (rust expansion leading to concrete cracking); Functional loss creates a vicious cycle: After the rubber sealing strip ages and the steel corrodes, the expansion joint cannot properly perform its "expansion and displacement" function—when temperature changes or vehicle loads cause the beam to expand or contract, they will compress and damage the surrounding concrete, further widening the gaps, forming a vicious cycle of "corrosion → damage → more severe corrosion," ultimately leading to premature failure of the expansion joint (normal lifespan is 10-15 years, but with poor leveling, it may need to be replaced every 3-5 years), and shortening the overall service life of the bridge.

[0010] The difficulty of leveling directly increases the "time cost" and "economic cost" of the construction phase: Increased construction investment: To achieve accuracy, it is necessary to repeatedly use equipment such as levels and total stations for measurement (usually requiring an error of ≤2mm), and adjust the anchoring height of the expansion joints and the position of the steel sections. This process requires additional labor (such as surveyors and welders) and equipment (such as small cranes and grinders), and the more adjustments are made, the higher the labor and equipment costs become; High rework rate and large material waste: If the accuracy after leveling is not up to standard (such as the height difference exceeding the specification), it is necessary to remove the installed anchor bars, cut the steel sections, and reposition and reinstall them, resulting in waste of materials such as steel sections, reinforcing bars, and concrete; Construction delays: Expansion joint installation is usually the "final procedure" before the bridge opens to traffic. If leveling is repeatedly time-consuming, it will directly delay the overall opening progress of the bridge. Especially for urban main roads and highway bridges, the delay will lead to increased traffic detour costs (such as vehicles traveling an extra 10-20 kilometers), resulting in indirect social losses.

[0011] Poorly leveled expansion joints are prone to damage, leading to a surge in maintenance frequency and costs, and causing continuous traffic disruption: Maintenance costs increase dramatically: Expansion joints are susceptible to problems such as steel corrosion, damaged sealing strips, and concrete breakage, requiring frequent maintenance (e.g., annual replacement of sealing strips, and steel repair every 3-5 years). Severe damage necessitates complete replacement (the cost of replacing a single expansion joint can range from tens of thousands to hundreds of thousands of yuan, depending on its length and type); Traffic impact is significant: Maintenance or replacement of expansion joints requires the closure of some lanes (or even the entire bridge) – closures of urban bridges cause congestion on main roads, and closures of highways trigger long-distance traffic jams, directly impacting logistics efficiency (e.g., delayed trucks causing spoilage) and citizen travel (e.g., doubling commuting time), resulting in enormous social costs. The difficulty of leveling will also indirectly have a negative impact on the surrounding environment: prolonged pollution during construction period: repeated leveling will lead to a longer construction period, and the noise and dust generated by the operation of machinery (such as cutting machines and welding machines) will continue to affect the lives of nearby residents (such as noise disturbing sleep at night and dust polluting the air); increased exhaust emissions during maintenance period: frequent road closures for maintenance in the later period will lead to vehicles idling and queuing, increasing exhaust emissions (especially diesel trucks), exacerbating regional air pollution, which is contrary to environmental protection requirements.

[0012] On September 5, 2025, a search was conducted in the China Patent Publication Database using the abstract keywords "cavity and expansion joint and wave and stainless steel and elastomer and noise and long and short" with the option to allow synonym expansion. No relevant literature was found.

[0013] On September 5, 2025, an abstract search was conducted on CNKI (China National Knowledge Infrastructure) using the keywords "void and expansion joint and wave and stainless steel and elastomer and noise and long and short", but no relevant literature was found.

[0014] On September 5, 2025, a search was conducted on the website of the United States Patent and Trademark Office for the phrase "cavity with expansion joint with wave with stainless steel with elastomer with noise with long with short," but no relevant literature was found; the search URL is https: / / ppubs.uspto.gov / pubwebapp / .

[0015] On September 5, 2025, a search was conducted on WIPO's website https: / / patentscope2.wipo.int / for the keywords "cavity and expansion joint and wave and stainless steel and elastomer and noise and long and short", but no relevant literature was found.

[0016] On September 5, 2025, a search was conducted on the website of the Japan Patent Office (https: / / www.j-platpat.inpit.go.jp / ) for the keywords "cavity and expansion joint and wave and stainless steel and elastomer and noise and long and short", but no relevant literature was found. Summary of the Invention

[0017] Purpose of the invention: To provide a more effective, durable, noise-reducing, π-shaped steel multi-directional displacement bridge expansion joint, the specific purpose of which is described in the detailed implementation section for several substantial technical effects.

[0018] To achieve the above objectives, the present invention adopts the following technical solution: A durable, noise-reducing, π-shaped steel multi-directional displacement bridge expansion joint, comprising a sliding side integral beam 2 and a fixed side integral beam 7 arranged in a staggered manner on both sides of the pre-reserved groove of the expansion joint, characterized in that... Below the overlapping part of the sliding side integral side beam 2 and the fixed side integral side beam 7, there is a displacement support 4. The displacement support 4 includes an upper elastic rubber layer and a lower steel support layer. The displacement support 4 can realize the multi-directional displacement function of the telescopic device. The durable, noise-reducing π-shaped steel multi-directional displacement bridge expansion joint is arranged on both sides of the expansion joint. The required installation slot widths on both sides of the expansion joint are not the same, that is, one side is longer and the other side is shorter. The anchor plate passes through the hole 104 and the connecting steel bar 8 passes through it. Multiple vertically upward threaded columns 103 are arranged at intervals on the connecting steel bar 8. It also includes a threaded sleeve 102. Above the threaded sleeve 102 is a cross support frame 101. The bottom of the cross support frame 101 can be supported on the concrete on the side. The threaded column 103 and the corresponding threaded sleeve 102 comprise multiple threads, and the multiple threaded columns 103 and the corresponding threaded sleeves 102 are evenly distributed on the connecting steel bar 8. Among them, threaded posts 103 and corresponding threaded sleeves 102 are arranged on the connecting steel bars 8 of the concrete holes near the side. The cross support frame 101 is a plate-like structure in the shape of a cross.

[0019] A further technical solution of the present invention is that a corrugated stainless steel waterstop 6 is arranged between the vertical baffle 19 and the fixed side integral beam 7, and a sound-absorbing rubber body 18 is arranged on the corrugated stainless steel waterstop 6.

[0020] A further technical solution of the present invention is that a rubber waterstop 11 is arranged below the corrugated stainless steel waterstop 6.

[0021] A further technical solution of the present invention is that the two sides of the rubber waterstop 11 are fixed to the angle steel 12 by buckles or steel bars.

[0022] A further technical solution of the present invention is that an integral anchor plate 1 is arranged behind the integral side beam 2 on the sliding side, a sound-absorbing foam 17 is arranged below the integral side beam 2 on the sliding side, a support bracket 13 and a displacement partition 15 are arranged below the sound-absorbing foam 17, and concrete is grouted below the displacement partition 15; a vertical baffle 19 is arranged on the side of the support bracket 13 and the displacement partition 15, a displacement support 4 is supported above the support bracket 13 and the vertical baffle 19, and an angle steel 12 is pressed below the vertical baffle 19.

[0023] A further technical solution of the present invention is that an integral anchor plate 1 is arranged behind the integral side beam 7 on the fixed side, and a transverse reinforcing bar 9 passes through the hole of the integral anchor plate 1, while the transverse reinforcing bar 9 passes through the pre-embedded reinforcing bar 8. The integral anchor plate 1, the transverse reinforcing bar 9, and the pre-embedded reinforcing bar 8 are all located in the post-cast concrete strip 10.

[0024] A further technical solution of the present invention is that part of the pre-embedded steel bar 8 is located in the bridge beam.

[0025] The installation method of the durable noise-reducing π-shaped steel multi-directional displacement bridge expansion joint is characterized in that, when using the durable noise-reducing π-shaped steel multi-directional displacement bridge expansion joint as described above, rotating the cross support frame 101 can pull the height of the connecting steel bar 8, further pull the height of the reinforced anchor plate 2, and further pull the height of the overall expansion joint in the middle; making leveling more convenient and with high leveling accuracy. After use, the cross support bracket 101 can be removed and reused.

[0026] The present invention, employing the above technical solution, offers the following advantages over existing technologies: The addition of a multi-directional displacement component satisfies the multi-directional displacement requirements of bridges. It solves the problem that cross-joint expansion joints cannot truly achieve multi-directional displacement. The displacement support consists of two parts: an upper elastic rubber body and a lower steel support, with the rubber body and steel support tightly connected as a single unit. The sliding and fixed side comb-tooth edge beam profiles are integrally molded, resulting in good overall durability. A two-layer water-stop structure—an upper stainless steel waterstop and a lower rubber waterstop—better performs drainage and water-stopping functions, extending service life. The horizontal plate prevents the expansion joint's displacement function from being affected by excessive concrete pouring. The integral anchor plate is connected to the pre-embedded reinforcing steel, greatly enhancing anchoring performance. Sound-absorbing foam boards are filled above the horizontal plate and below the sliding side comb-tooth edge beam, and sound-absorbing rubber is filled above the stainless steel waterstop to effectively reduce traffic noise. These two fillers not only reduce noise but also support the sliding stainless steel plate, preventing it from falling off. Attached Figure Description

[0027] To further illustrate the present invention, the following description is provided in conjunction with the accompanying drawings: Figure 1 Annotated cross-sectional view of the invention patent structure; Figure 2 Cross-sectional view of corrugated stainless steel waterstop and U-shaped groove; Figure 3 Cross-sectional view of the stainless steel plate on the sliding side and the stainless steel plate on the fixed side; Figure 4 Cross-sectional view of angle steel and rubber waterstop structure; Figure 5 Three-dimensional view of the invention patent; Figure 6 Three-dimensional view of the integral side beam on the sliding side and the integral side beam on the fixed side; Figure 7 3D view of the overall anchor plate structure; Figure 8 3D view of the support bracket structure for displacement; Figure 9 A three-dimensional diagram showing the structural positional relationship of the supporting brackets, displacement partitions, and vertical baffles; Figure 10 3D view of rubber waterstop and angle steel structure; Figure 11 3D view of the wavy stainless steel waterstop and U-shaped groove structure; Figure 12 Existing technology structural cross-sectional view; Figure 13 A drawing for further improvements to the invention; The components include: 1. Integral anchor plate; 2. Integral side beam on the sliding side; 3. Stainless steel plate on the sliding side; 4. Displacement support; 5. Stainless steel plate on the fixed side; 6. Corrugated stainless steel waterstop; 7. Integral side beam on the fixed side; 8. Embedded steel bars; 9. Transverse steel bars; 10. Post-cast concrete strip; 11. Rubber waterstop; 12. Angle steel; 13. Supporting displacement bracket; 14. Concrete pouring baffle; 15. Displacement partition; 16. U-shaped groove; 17. Sound-absorbing foam; 18. Sound-absorbing rubber body; 19. Vertical baffle. 101. Cross support frame; 102. Threaded sleeve; 103. Threaded post; 104. Anchor plate through hole. Detailed Implementation

[0028] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] This patent provides multiple parallel solutions; the different descriptions represent improved solutions or parallel solutions based on the basic solution. Each solution has its own unique characteristics. Furthermore, the technical features involved in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other. Fixing methods not described herein can be any type of fixing, such as threaded fixing, bolt fixing, or adhesive bonding.

[0031] Example 1: Referring to all the attached drawings; a durable and noise-reducing π-shaped steel multi-directional displacement bridge expansion joint, comprising a sliding side integral beam 2 and a fixed side integral beam 7 arranged in a staggered manner on both sides of the expansion joint pre-reserved groove, characterized in that, Below the overlapping part of the sliding side integral side beam 2 and the fixed side integral side beam 7, there is a displacement support 4. The displacement support 4 includes an upper elastic rubber layer and a lower steel support layer. The displacement support 4 can realize the multi-directional displacement function of the telescopic device. The durable, noise-reducing π-shaped steel multi-directional displacement bridge expansion joint is arranged on both sides of the expansion joint. The required installation slot widths on both sides of the expansion joint are not the same, that is, one side is longer and the other side is shorter. The anchor plate passes through the hole 104 and the connecting steel bar 8 passes through it. Multiple vertically upward threaded columns 103 are arranged at intervals on the connecting steel bar 8. It also includes a threaded sleeve 102. Above the threaded sleeve 102 is a cross support frame 101. The bottom of the cross support frame 101 can be supported on the concrete on the side. The threaded column 103 and the corresponding threaded sleeve 102 comprise multiple threads, and the multiple threaded columns 103 and the corresponding threaded sleeves 102 are evenly distributed on the connecting steel bar 8. Among them, threaded posts 103 and corresponding threaded sleeves 102 are arranged on the connecting steel bars 8 of the concrete holes near the side. The cross support frame 101 is a plate-like structure in the shape of a cross.

[0032] The technical solution of this durable and noise-reducing π-shaped steel multi-directional displacement bridge expansion joint has the following substantive technical effects and implementation process, i.e., basic functions: Comparing with the last attached figure, when both sides are symmetrical, due to the installation position of the supporting structure below, most of it is empty. In this embodiment, one side is longer than the other, which allows for the grouting of more concrete.

[0033] Further design features include: the addition of a multi-directional displacement component to meet the multi-directional displacement requirements of bridges, solving the problem that cross-joint expansion joints cannot truly achieve multi-directional displacement. The displacement support consists of two parts: an upper elastic rubber body and a lower steel support, with the rubber body and steel support tightly connected as one unit; the sliding and fixed side comb-tooth edge beam profiles are integrally molded, resulting in good overall durability. A two-layer water-stop structure—an upper stainless steel waterstop and a lower rubber waterstop—better performs drainage and water-stopping functions, extending service life. The horizontal plate is used to prevent the expansion joint's displacement function from being affected by excessive concrete pouring. The integral anchor plate is connected to the pre-embedded steel bars, greatly enhancing anchoring performance. Sound-absorbing foam boards are filled above the horizontal plate and below the sliding side comb-tooth edge beam, and sound-absorbing rubber is filled above the stainless steel waterstop to effectively reduce traffic noise. These two fillers not only reduce noise but also support the sliding stainless steel plate, preventing it from falling off.

[0034] Using the aforementioned durable and noise-reducing π-shaped steel multi-directional displacement bridge expansion joint, when in use, rotating the cross support frame 101 can pull the height of the connecting steel bar 8, further pull the height of the reinforced anchor plate 2, and further pull the height of the overall expansion joint in the middle; making leveling more convenient and with high leveling accuracy. After use, the cross support bracket 101 can be removed and reused.

[0035] In use, rotating the cross support frame 101 can raise the height of the connecting steel bar 8, further raising the height of the reinforced anchor plate 2, and further raising the height of the overall expansion joint in the middle. This makes leveling more convenient and accurate, avoiding complex lifting procedures. The addition of a multi-directional displacement component can meet the multi-directional displacement requirements of bridges, solving the problem that cross-joint expansion devices cannot truly achieve multi-directional displacement. The integral comb-tooth edge beam profile is formed in one piece, resulting in good overall durability. The multi-directional displacement anchor plate has multiple holes, enhancing the integrity of the concrete area and improving its service life. Furthermore, the multi-directional displacement component, horizontal plate, and vertical plate can be fixed on top, providing support. The horizontal plate is used to prevent the expansion device's displacement function from being affected by excessive concrete pouring. The anchor plate connects with the pre-embedded steel bars, greatly enhancing anchoring performance.

[0036] Example 2: As a further improvement, parallel, or optional independent solution, a corrugated stainless steel waterstop 6 is arranged between the vertical baffle 19 and the fixed side integral beam 7, and a sound-absorbing rubber body 18 is arranged on top of the corrugated stainless steel waterstop 6. A rubber waterstop 11 is arranged below the corrugated stainless steel waterstop 6. The substantial technical effect and implementation process of this technical solution, i.e., its basic function, are as follows: the corrugated stainless steel waterstop 6 itself has a certain deformation capacity and support capacity, and the noise reduction and vibration damping effects are indeed better.

[0037] Example 3: As a further improvement, parallel solution, or optional independent solution, the two sides of the rubber waterstop 11 are fixed to the angle steel 12 by buckles or steel bar binding. The substantive technical effect and implementation process of this technical solution, i.e., its basic function, is as follows: forming a double-layer waterstop structure. Similar fixing methods are all within the protection scope of this patent.

[0038] Example 4: As a further improvement, parallel, or optional independent solution, an integral anchor plate 1 is arranged behind the sliding side integral beam 2. Sound-absorbing foam 17 is arranged below the sliding side integral beam 2. Below the sound-absorbing foam 17, a support bracket 13 and a displacement partition 15 are arranged. Concrete is grouted below the displacement partition 15. Vertical baffles 19 are arranged on the sides of the support bracket 13 and displacement partition 15. A displacement support 4 is supported above the support bracket 13 and vertical baffle 19. Angle steel 12 is pressed below the vertical baffle 19. The substantive technical effect and implementation process of this technical solution, i.e., its basic function, are as follows: it provides a specific arrangement structure for the angle steel, as well as a structure and method for setting the foam.

[0039] Example 5: As a further possible improvement, parallel, or optional independent solution, an integral anchor plate 1 is arranged behind the integral side beam 7 on the fixed side. A transverse reinforcing bar 9 passes through the hole in the integral anchor plate 1, and the transverse reinforcing bar 9 passes through the pre-embedded reinforcing bar 8. The integral anchor plate 1, transverse reinforcing bars 9, and pre-embedded reinforcing bars 8 are all located within the post-cast concrete strip 10. The substantive technical effects and implementation process of this technical solution, i.e., its basic functions, are as follows: greater structural strength and more suitable layout.

[0040] Example 7: As a further possible improvement, parallel, or optional independent solution, part of the pre-embedded steel bar 8 is located in the bridge body.

[0041] Innovatively, each of the above effects exists independently, yet a single structure can be used to combine the results.

[0042] It should be noted that the multiple solutions provided in this patent include their own basic solutions, which are independent of each other and do not restrict each other. However, they can also be combined with each other without conflict to achieve multiple effects.

[0043] 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 embodiments and descriptions in the 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 claims.

Claims

1. A durable and noise-reducing π-shaped steel multi-directional displacement bridge expansion joint, comprising a sliding side integral side beam (2) and a fixed side integral side beam (7) arranged in a staggered manner on both sides of the expansion joint pre-reserved groove, characterized in that, Below the overlapping part of the sliding side integral side beam (2) and the fixed side integral side beam (7), there is a displacement support (4). The displacement support (4) includes an upper elastic rubber layer and a lower steel support layer. The displacement support (4) can realize the multi-directional displacement function of the telescopic device. The durable, noise-reducing π-shaped steel multi-directional displacement bridge expansion joint is arranged on both sides of the expansion joint. The required installation slot widths on both sides of the expansion joint are not the same, that is, one side is longer and the other side is shorter. The anchor plate passes through the hole (104) through which the connecting steel bar (8) passes. Multiple vertically upward threaded columns (103) are arranged at intervals on the connecting steel bar (8), and it also includes a threaded sleeve (102). Above the threaded sleeve (102) is a cross support frame (101), and below the cross support frame (101) it can be supported on the concrete on the side. The threaded column (103) and the corresponding threaded sleeve (102) comprise multiple threads, and the multiple threaded columns (103) and the corresponding threaded sleeves (102) are evenly distributed on the connecting steel bar (8); Among them, threaded posts (103) and corresponding threaded sleeves (102) are arranged on the connecting steel bars (8) of the concrete holes near the side. The cross support frame (101) is a plate structure in the shape of a cross.

2. The durable, noise-reducing, π-shaped steel multi-directional displacement bridge expansion joint as described in claim 1, characterized in that, A corrugated stainless steel waterstop (6) is arranged between the vertical baffle (19) and the fixed side integral beam (7), and a sound-absorbing rubber body (18) is arranged on the corrugated stainless steel waterstop (6).

3. The durable, noise-reducing, π-shaped steel multi-directional displacement bridge expansion joint as described in claim 2, characterized in that, A rubber waterstop (11) is arranged below the corrugated stainless steel waterstop (6).

4. The durable, noise-reducing, π-shaped steel multi-directional displacement bridge expansion joint as described in claim 3, characterized in that, The rubber waterstop (11) is fixed to the angle steel (12) on both sides by buckles or steel bars.

5. The durable, noise-reducing, π-shaped steel multi-directional displacement bridge expansion joint as described in claim 4, characterized in that, An integral anchor plate (1) is arranged behind the sliding side integral side beam (2). Sound-absorbing foam (17) is arranged below the sliding side integral side beam (2). A support displacement bracket (13) and a displacement partition (15) are arranged below the sound-absorbing foam (17). Concrete is grouted below the displacement partition (15). A vertical baffle (19) is arranged on the side of the support displacement bracket (13) and the displacement partition (15). A displacement support (4) is supported above the support displacement bracket (13) and the vertical baffle (19). An angle steel (12) is pressed below the vertical baffle (19).

6. The durable, noise-reducing, π-shaped steel multi-directional displacement bridge expansion joint as described in claim 5, characterized in that, An integral anchor plate (1) is arranged behind the fixed side integral side beam (7). A transverse reinforcing bar (9) passes through the hole of the integral anchor plate (1), and the transverse reinforcing bar (9) passes through the pre-embedded reinforcing bar (8). The integral anchor plate (1), the transverse reinforcing bar (9), and the pre-embedded reinforcing bar (8) are all located in the post-cast strip concrete (10).

7. The durable, noise-reducing, π-shaped steel multi-directional displacement bridge expansion joint as described in claim 6, characterized in that, The portion of the pre-embedded steel bars (8) is located in the bridge beam.

8. An installation method for a durable, noise-reducing, π-shaped steel multi-directional displacement bridge expansion joint, characterized in that... Using the durable noise reduction π-shaped steel multi-directional displacement bridge expansion joint as described in claim 1, when in use, rotating the cross support frame (101) can pull the height of the connecting steel bar (8), further pull the height of the reinforced anchor plate (2), and further pull the height of the overall expansion joint in the middle; making leveling more convenient and with high leveling accuracy; After use, the cross support bracket (101) can be removed and reused.

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