Prestressed sound barrier structure with arc-shaped pre-arch keel and manufacturing method thereof

Abstract

This invention discloses a prestressed sound barrier structure with an arc-shaped pre-arched keel and its manufacturing method, relating to the field of sound barrier technology. The prestressed sound barrier structure includes a screen shell and a keel; the screen shell includes a front panel and a back panel, the front panel having a plurality of sound-absorbing holes, and the keel being disposed between the front panel and the back panel; in the installed state, at least a portion of the keel has an arched structure, and the arched structure presses against the inner side of the back panel, forcing the back panel to undergo an outward arc-shaped pre-arched deformation. The solution provided by this invention can reduce the deflection value of the screen shell when subjected to wind pressure loads.

Description

Technical Field

[0001] This invention relates to the field of sound barrier technology, and in particular to a prestressed sound barrier structure with an arc-shaped pre-arched keel and its manufacturing method. Background Technology

[0002] With high-speed railways operating at speeds of 400 km / h and above, the pulsating wind pressure generated by train encounters, combined with the maximum wind pressure encountered once every 50 years, can reach 5000 Pa or even 8000 Pa or more, posing a severe challenge to the wind pressure resistance of sound barriers along the railway line. Under the repeated action of such extreme wind pressure, the sound barrier panels are prone to excessive deflection deformation, leading to panel cracking, sealing failure, or even detachment, seriously affecting train operation safety.

[0003] To improve the screen's wind pressure resistance, the relevant technologies mainly adopt the following two measures: First, increase the thickness of the panel and back panel (e.g., from 1.5mm to 2mm or more) to improve the overall rigidity of the screen; second, install a vertical continuous keel in the cavity between the panel and back panel to provide additional bending stiffness.

[0004] Increasing the thickness of the sheet metal significantly increases the screen's weight and manufacturing cost, while offering little benefit in terms of stiffness improvement. While vertical, continuous keels can improve bending stiffness, traditional keels are straight, resulting in only simple planar contact between the keel and the panel / back panel after installation, lacking pre-tension. Specifically, when negative wind pressure (i.e., the suction force from the back panel towards the panel) acts on the back panel, the back panel must first undergo inward deflection before it can adhere to the inner side of the keel and transfer the load, leading to a significant lag in the keel's reinforcing effect. When positive wind pressure (i.e., the thrust from the panel towards the back panel) acts on the back panel, the back panel is pushed outward, losing contact with the straight keel. The keel provides almost no bending support, and the back panel still experiences significant outward deflection. Therefore, existing straight keel structures cannot effectively handle wind pressure loads from both positive and negative directions simultaneously. Summary of the Invention

[0005] The purpose of this invention is to provide a prestressed sound barrier structure with an arc-shaped pre-arched keel and its manufacturing method, so as to solve the problems existing in the prior art, improve the wind pressure resistance of the barrier, and reduce the deflection of the barrier.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention provides a prestressed sound barrier structure with an arc-shaped pre-arched keel, including a screen shell and a keel; the screen shell includes a front panel and a back panel, the front panel is provided with a plurality of sound-absorbing holes, and the keel is disposed between the front panel and the back panel; in the installed state, at least a portion of the keel has an arched structure, and the arched structure presses against the inner side of the back panel, forcing the back panel to produce an arc-shaped pre-arched deformation outward.

[0007] In some embodiments, the keel has the arched structure even when not installed.

[0008] In some embodiments, the height of the keel is greater than the net depth of the inner cavity of the screen housing when the keel is not installed.

[0009] In some embodiments, one side of the keel is constructed as an arched structure, and the other side is a straight structure, the straight structure being used to abut against the inner side of the panel.

[0010] In some embodiments, a sound-absorbing block is sandwiched between the panel and the back panel.

[0011] In some embodiments, the sound-absorbing block is a rock wool block.

[0012] In some embodiments, the keel includes a main board and side wing plates. One side of the main board is constructed as an arched structure, and the other side is constructed as a straight structure. Side wing plates extending perpendicular to the main board are provided on both sides of the main board in the thickness direction. Two side wing plates are provided on each side. The length direction of the two side wing plates is parallel to the length direction of the main board. The sound-absorbing block is clamped between the two side wing plates on each side.

[0013] In some embodiments, a plurality of keels are included, and the plurality of keels are arranged in parallel.

[0014] The present invention also provides a method for manufacturing the sound barrier structure as described above, comprising: Provides a keel and a screen housing, wherein the panel in the screen housing is in an open state relative to the back panel; Place the keel on the inner side of the back plate; Fold the panel toward the back panel and apply pressure so that the arched structure of the keel presses against the inner side of the back panel, forcing the back panel to undergo an outward arc-shaped pre-arch deformation.

[0015] In some embodiments, the keel, the sound-absorbing block, and the clamping keel for clamping the sound-absorbing block are placed together on the inner side of the back panel before the panel is folded.

[0016] The present invention achieves the following technical effects compared to the prior art: When the keel is installed in an arched shape and pressed tightly against the inner side of the back panel, the back panel is forced to undergo a slight outward arching deformation. This arching deformation imparts an inward prestress to the back panel before the wind pressure acts. When the negative wind pressure generated after the train passes (i.e., the force drawn from the back panel to the panel) acts on the screen, because the keel is pre-pressed against the back panel, the keel can directly resist the deformation of the back panel, thus significantly reducing the actual deformation of the back panel under negative wind pressure conditions. When positive wind pressure (i.e., the force blown from the panel to the back panel) acts, the direction of the wind pressure is opposite to the direction of the prestress. The wind pressure must first overcome the prestress before the back panel can continue to generate outward net deflection, thereby significantly reducing the actual deformation of the back panel under positive wind pressure conditions. In summary, the solution provided by this invention inevitably reduces the degree of deformation and the deflection value of the screen, regardless of whether the wind pressure is positive or negative. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the screen housing structure; Figure 2 This is a schematic diagram of the keel structure; Figure 3 for Figure 1 The front view; Figure 4 for Figure 2 The front view; Figure 5 This is an exploded view of a prestressed sound barrier structure; In the diagram: 1-Screen housing; 11-Panel; 12-Back panel; 13-End panel; 14-Sound absorption area; 2-Rack; 21-Main board; 22-Side wing panel; 23-Arched structure; 24-Straight structure. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide a prestressed sound barrier structure with an arc-shaped pre-arched keel and its manufacturing method, so as to solve the problems existing in the prior art, improve the wind pressure resistance of the barrier, and reduce the deflection of the barrier.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.

[0023] Example 1 This invention provides a prestressed sound barrier structure with an arc-shaped pre-arched keel, including a screen shell 1 and a keel 2; the screen shell 1 includes a panel 11 and a back plate 12, the panel 11 faces the track, and the panel 11 is provided with a plurality of sound-absorbing holes (not shown, located in the sound-absorbing hole area 14 in the figure), and the keel 2 is disposed between the panel 11 and the back plate 12; in the installed state, at least a portion of the keel 2 is an arched structure 23, and the arched structure 23 presses against the inner side of the back plate 12, forcing the back plate 12 to produce an arc-shaped pre-arched deformation outward, the maximum deformation can be 1mm~10mm, for example, 2mm, 3mm, etc.

[0024] When the keel 2 is installed in an arched shape and pressed against the inner side of the back panel 12, the back panel 12 is forced to undergo outward micro-arc pre-arch deformation. This pre-arch deformation imparts an inward prestress to the back panel 12 before the wind pressure acts. When the negative wind pressure generated after the train passes (i.e., the force drawn from the back panel 12 to the panel 11) acts on the screen, since the keel 2 is pre-pressed against the back panel 12, the keel 2 can directly resist the deformation of the back panel 12, thus significantly reducing the actual deformation of the back panel 12 under negative wind pressure conditions. When positive wind pressure (i.e., the force blown from the panel 11 to the back panel 12) acts, the direction of the wind pressure is opposite to the direction of the prestress. The wind pressure must first overcome the prestress before the back panel 12 can continue to generate outward net deflection, thereby significantly reducing the actual deformation of the back panel 12 under positive wind pressure conditions. In summary, the solution provided by this invention inevitably reduces the degree of deformation and the screen deflection value under both positive and negative wind pressure conditions.

[0025] It is understood that when using the solution provided by this invention, the keel 2 does not require any fasteners (such as screws, rivets, welding, etc.) to fix it to the back plate 12 and the front plate 11. The keel 2 relies on the pre-tightening force generated by its own elastic compression to reliably maintain itself in the predetermined position between the front plate 11 and the back plate 12, and always maintain close contact with the inner side of the back plate 12 and the inner side of the front plate 11. Compared with the prior art of fixing the keel 2 to the back plate 12 with screws or rivets, this invention has the following advantages: First, it completely avoids drilling holes in the back plate 12, fundamentally eliminating the hidden dangers of sound leakage and water seepage, and ensuring the sound insulation performance and service life of the sound barrier; second, it eliminates the need for additional processes such as drilling, screwing, or welding, simplifying the assembly process and reducing manufacturing costs; third, since the keel 2 is in elastic contact with the front plate 11 and the back plate 12 rather than being rigidly fixed, it can better absorb and buffer the vibration caused by pulsating wind pressure, reduce stress concentration at the connection, and improve the fatigue resistance of the structure.

[0026] In some embodiments, the keel 2 has an arched structure 23 even when not installed, and the rigidity of the keel 2 is greater than that of the back plate 12. Specifically, the height of the keel 2 is greater than the net depth of the inner cavity of the screen shell 1 when the keel 2 is not installed.

[0027] In this embodiment, the keel 2 has an arched structure 23 even when not installed, meaning that the keel 2 is bent even when in a free state (without external force). Since the net depth (thickness) of the original screen shell 1 (i.e., between the panel 11 and the back panel 12 when the keel 2 is not installed) is less than the arched chord height of the keel 2, when the keel 2 is forcibly inserted into the cavity, the arch of the keel 2 will first contact the inner side of the back panel 12. As the panel 11 and the back panel 12 close, the keel 2 undergoes elastic compression, and its stored elastic potential energy is converted into a continuous pressing force on the back panel 12, thereby forcing the back panel 12 to produce a micro-arc pre-arch deformation outward. It should be noted that although the hardness of the keel 2 is higher than that of the back panel 12, elastic compression is an inherent response of all materials under stress, and it is this recoverable elastic compression that provides the required prestress; the keel 2 will not undergo plastic yielding or crushing, so the prestress will not significantly decrease due to material creep during long-term use.

[0028] Of course, the free-state arch of the keel 2 does not have to be a strictly symmetrical arc. For example, an eccentric arch can be used so that the clamping force on the back plate 12 is more concentrated in the central area with the greatest deflection.

[0029] In some embodiments, one side of the keel 2 is constructed as an arched structure 23, and the other side is a straight structure 24, which is used to abut against the inner side of the panel 11.

[0030] In this embodiment, the arched side of the keel 2 provides concentrated clamping force to the back panel 12, while the flat side provides uniform surface contact to the panel 11. This allows the back panel 12 and the panel 11 to transmit force through the keel 2. When negative wind pressure (suction) is applied, the back panel 12 pushes the keel 2 inward, and the flat side evenly transmits the force to the panel 11, allowing the panel 11 to also participate in bearing the load. This converts part of the bending moment borne by the keel 2 into the membrane stress of the panel 11, improving the overall load-bearing efficiency of the structure.

[0031] In other embodiments, the side of the keel 2 facing the panel 11 can also be designed as an arc (double arch) to generate preload on both sides. Alternatively, a layer of elastic polymer material (such as rubber or silicone) can be sandwiched between the flat side and the panel 11 to absorb high-frequency vibrations and compensate for dimensional tolerances.

[0032] In some embodiments, a sound-absorbing block is sandwiched between the panel 11 and the back panel 12.

[0033] The sound-absorbing blocks fill the cavity between the panel 11 and the back panel 12. When train noise enters the cavity through the sound-absorbing holes on the panel 11, the sound waves undergo viscous loss and heat exchange in the fibers or pores of the sound-absorbing material, and the sound energy is converted into heat energy and dissipated. The presence of the sound-absorbing blocks enables the sound barrier to maintain excellent sound absorption and noise reduction effects while possessing ultra-high wind pressure resistance (typically, the noise reduction coefficient NRC can reach above 0.7). In addition, the sound-absorbing blocks also provide some lateral support and damping for the keel 2, which can suppress the lateral vibration of the keel 2 under alternating wind pressure and reduce secondary noise caused by the resonance of the keel 2.

[0034] In other embodiments, the sound-absorbing blocks can be made of different materials, such as rock wool blocks, polyester fibers, glass wool, slag wool, aluminum foam, microporous ceramics, or melamine sponge. The shape of the sound-absorbing blocks is not limited to rectangular blocks; they can also be made into irregularly shaped blocks that match the contours of the cavity, or foamed sound-absorbing material can be directly poured into the cavity. The sound-absorbing blocks can be covered with a water-repellent cloth (such as alkali-free fiberglass cloth) to prevent moisture absorption and fiber scattering, or they can be left uncovered and rely on the sealing of the panel 11 and the back panel 12 to achieve moisture protection.

[0035] In some embodiments, the keel 2 includes a main board 21 and side wing plates 22. One side of the main board 21 is constructed as an arched structure 23, and the other side is constructed as a straight structure 24. Side wing plates 22 extending along a direction perpendicular to the main board 21 are provided on both sides of the main board 21 in the thickness direction. Two side wing plates 22 are provided on each side. The length direction of the two side wing plates 22 is parallel to the length direction of the main board 21. A sound-absorbing block is sandwiched between the two side wing plates 22 on each side.

[0036] The side wing plates 22 on both sides of the main board 21 form an "I" or "C" shaped auxiliary structure, which has multiple functions: First, the side wing plates 22 increase the moment of inertia of the cross section of the keel 2, giving it higher bending stiffness when subjected to out-of-plane bending loads, thereby reducing the deformation of the keel 2 itself; Second, the gap between the two side wing plates 22 on each side forms a slot, which can be used to clamp the sound-absorbing block without the need for additional plastic clips or adhesives, simplifying the assembly process and reducing costs.

[0037] In other embodiments, the number of side wing plates 22 may be one (L-shaped), two or more, and their extension direction may be perpendicular to the main board 21 or at a certain tilt angle (such as opening outward at 60°).

[0038] In some embodiments, a plurality of keels 2 are included, and the plurality of keels 2 are arranged in parallel.

[0039] Multiple parallel keels 2 divide the inner cavity of the screen into multiple independent sub-cavities along the width direction. This layout brings the following advantages: First, the back panel 12 area in each sub-cavity independently bears the wind pressure. When the back panel 12 area corresponding to a certain sub-cavity undergoes local deflection, the keels 2 of adjacent sub-cavities provide rigid boundaries, limiting the expansion of the deflection area and thus reducing the overall deformation of the back panel 12. Second, multiple keels 2 work in parallel, which is equivalent to multiple keels 2 sharing the load. Even if the preload of individual keels 2 is slightly reduced, the remaining keels 2 can still provide sufficient support, improving the redundancy and reliability of the system. Third, the gaps between the parallel keels 2 are just enough to accommodate the sound-absorbing blocks, forming a structure in which sound-absorbing materials and reinforcing structures are arranged alternately, realizing the integration of structure and function.

[0040] Of course, the multiple keels 2 do not have to be strictly parallel, but can be arranged radially or in a cross-grid pattern to adapt to special application scenarios where the screen shape is not rectangular (such as circular or arc-shaped sound barriers). The spacing between the keels 2 can be equal or gradually increase from the center of the screen to both sides to make the deflection distribution of the back panel 12 more uniform. In addition, transverse connecting rods or cross supports can be set between adjacent keels 2 to form a spatial truss system, further improving the overall stability.

[0041] Example 2 The present invention also provides a method for manufacturing the sound barrier structure in Embodiment 1, comprising: Provides a keel 2 and a screen housing 1, wherein the panel 11 in the screen housing 1 is in an open state relative to the back panel 12; Place the keel 2 on the inner side of the back plate 12; Fold the panel 11 toward the back plate 12 and apply pressure so that the arched structure 23 of the keel 2 presses against the inner side of the back plate 12, forcing the back plate 12 to produce an outward arc-shaped pre-arch deformation.

[0042] The key to this manufacturing method lies in utilizing the closing force during the folding process of panel 11 to compress keel 2 and pre-tighten it. Specifically, since the free chord height of keel 2 is greater than the net depth of the inner cavity, as panel 11 gradually moves towards back plate 12, the inner side of panel 11 contacts the straight side of keel 2, and pressure continues to be applied to press keel 2 against back plate 12. Because the hardness of back plate 12 is lower than that of keel 2, back plate 12 undergoes elastic deformation before keel 2, thus arching back plate 12. When panel 11 is fully closed and fixed, keel 2 is in a stable compressed and tightened state. This method has the following advantages: First, the assembly process is simple, requiring only a conventional bending machine or pressing fixture; second, the prestress is determined by the geometric dimensions (difference between chord height and inner cavity depth), unaffected by human error, resulting in good quality consistency; third, it avoids the complex processes of tensioning, anchoring, and grouting in traditional prestressing technology, significantly reducing manufacturing costs.

[0043] In some embodiments, the keel 2, the sound-absorbing block, and the clamping keel used to clamp the sound-absorbing block are placed together on the inner side of the back panel 12 before the panel 11 is folded.

[0044] In this embodiment, all internal components (main keel, sound-absorbing blocks, and clamping keel) are placed in place at once before folding the panel 11, achieving a highly efficient "final assembly" mode. The clamping keel (e.g., slender U-shaped or C-shaped plastic clips) is also used to limit the position of the sound-absorbing blocks, further preventing them from shifting during service. Simultaneously, since all components are in place before folding, the folding of the panel 11 generates a uniform compressive force, ensuring tight contact between the sound-absorbing blocks and the back panel 12 and keel 2, eliminating structural loosening and sound bridging effects caused by gaps. In the final formed screen, the sound-absorbing blocks are clamped between the main keel, clamping keel, and back panel 12, under slight pre-compression, preventing them from dislodging even under long-term vibration conditions.

[0045] In other embodiments, the sound-absorbing blocks can be temporarily fixed to the back panel 12 by spot welding with adhesive or double-sided tape, and then the keel 2 can be placed and the panel 11 folded. The keel can be secured with elastic wire mesh, corrugated spring sheets or foam strips.

[0046] When a separate end plate 13 is included, the end plate 13 needs to be installed onto the screen housing 1 at the appropriate time. Of course, the end plate 13 can also be an integral structure with the screen housing 1, formed by folding.

[0047] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A prestressed sound barrier structure with an arc-shaped pre-arched keel, comprising a screen shell; the screen shell includes a front panel and a back panel, the front panel being provided with a plurality of sound-absorbing holes, characterized in that: It also includes a keel, which is disposed between the panel and the back panel; In the installed state, at least a portion of the keel has an arched structure, and the arched structure presses against the inner side of the back plate, forcing the back plate to undergo an outward arc-shaped pre-arch deformation.

2. The prestressed sound barrier structure with an arc-shaped pre-arched keel according to claim 1, characterized in that: The keel has the arched structure even when it is not installed.

3. The prestressed sound barrier structure with an arc-shaped pre-arched keel according to claim 2, characterized in that: The height of the keel is greater than the net depth of the inner cavity of the screen shell when the keel is not installed.

4. The pre-stressed sound barrier structure with arched pre-cambered keel as claimed in claim 1 wherein: One side of the keel has an arched structure, and the other side has a straight structure. The straight structure is used to abut against the inner side of the panel.

5. The pre-stressed sound barrier structure with arc pre-arch keel according to claim 4, characterized in that: A sound-absorbing block is sandwiched between the panel and the back plate.

6. The pre-stressed sound barrier structure with arc pre-arch keel according to claim 5, characterized in that: The sound-absorbing block is a rock wool block.

7. The pre-stressed sound barrier structure having arc-shaped pre-cambered keel as claimed in claim 5 wherein: The keel includes a main board and side wing plates. One side of the main board is constructed as an arched structure, and the other side is constructed as a straight structure. Side wing plates extending perpendicular to the main board are provided on both sides of the main board in the thickness direction. Two side wing plates are provided on each side. The length direction of the two side wing plates is parallel to the length direction of the main board. The sound-absorbing block is clamped between the two side wing plates on each side.

8. The pre-stressed sound barrier structure having arc-shaped pre-cambered keel as claimed in claim 1 wherein: It includes multiple keels, which are arranged in parallel.

9. A method for manufacturing a sound barrier structure according to any one of claims 1 to 8, characterized in that: include: Provides a keel and a screen housing, wherein the panel in the screen housing is in an open state relative to the back panel; Place the keel on the inner side of the back plate; Fold the panel toward the back panel and apply pressure so that the arched structure of the keel presses against the inner side of the back panel, forcing the back panel to undergo an outward arc-shaped pre-arch deformation.

10. The method of claim 9, wherein: After placing the keel, sound-absorbing block, and the clamping keel used to hold the sound-absorbing block together on the inner side of the back panel, the panel is then folded.

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