Sound absorption structure of sound barrier and novel closed sound barrier

Abstract

The invention belongs to the technical field of sound barriers, particularly relates to a sound absorption structure of a sound barrier, and is particularly suitable for a railway bridge sound barrier. The sound absorption structure of the sound barrier comprises cross beams arranged side by side in the longitudinal direction and sound barrier unit plates arranged between the cross beams, supports are arranged on the upper end faces and the lower end faces of the cross beams respectively, back plates and face plates of the unit plates adjacent in the longitudinal direction are connected in a clamped mode through the supports respectively, the sections of the supports are in an I shape, and bottom plates of the supports are connected with the cross beams. Fist-clenching parts are arranged on the two sides of a top plate of the unit plate respectively, fist-holding parts are arranged on the edges of a back plate and a face plate of the unit plate respectively, the fist-holding parts and the fist-clenching parts are matched to form a clamping mechanism, and a buckle cover used for wrapping and fixing the clamping mechanism is arranged on the upper portion of the top plate of the support. The sound absorption structure of the barrier is convenient to manufacture and install and excellent in sound absorption and insulation performance, the top face of the sound barrier is smooth through hidden clamping connection, and the problems of sound leakage and rain seepage are avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of sound barriers, and specifically relates to a sound absorbing structure of a sound barrier and a novel closed sound barrier, and is particularly suitable for railway bridge sound barriers. Background Art

[0002] Sound barriers are the most commonly used noise control measures in the railway industry. They block the propagation path from the sound source to the receiving point, thereby reducing railway noise. At present, vertical sound barriers are widely used, which are set on both sides of the roadbed. The open structure has limited noise reduction effect. For areas with greater noise impact, such as high-speed railways, vertical sound barriers cannot effectively solve the traffic noise problem, and closed sound barriers are mostly used.

[0003] The top surface of the existing closed sound barrier is mostly arc-shaped or flat, and is composed of multiple rows of beam steel and sound barrier unit plates inserted therein. The connection between the unit plate and the beam steel has a gap, which can easily cause sound leakage and rain seepage on the top surface; secondly, during the on-site construction of the top surface, the splicing operation is troublesome, and the preliminary foundation construction technology is required to be high. If the foundation support size error occurs, the unit plate and the beam steel will not be tightly plugged in, loosen and fall off, or the indirect connection is too small, and the unit plate cannot be inserted; in addition, the thickness of the plug-in unit plate is limited by the slot of the beam steel, and the thickness of the sound absorber inside the unit plate cannot be effectively increased, which limits the sound absorption and isolation performance of the sound barrier. Summary of the invention

[0004] The purpose of the present invention is to provide a sound-absorbing structure of a sound barrier which is easy to manufacture and install and has excellent sound-absorbing and sound-insulating performance, and has the characteristics of hidden snap-in connection, smooth surface, and avoiding sound leakage and rain seepage.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: A sound absorbing structure of a sound barrier, comprising longitudinally arranged cross beams and sound barrier unit plates arranged between the cross beams, characterized in that: the upper end face and the lower end face of the cross beam are respectively provided with supports, the back plates and the face plates of the unit plates adjacent in the longitudinal direction are respectively connected by snapping through the supports, or a plurality of unit plates are provided between adjacent cross beams, and the adjacent unit plates are also connected by snapping through the supports, the cross section of the support is I-shaped, the bottom plate of which is connected to the cross beam, and fisting parts are respectively provided on both sides of the top plate, the edges of the back plate and the face plate of the unit plate are respectively provided with fisting parts, the fisting parts cooperate with the fisting parts to form a snapping mechanism, and a buckle cover for covering and fixing the snapping mechanism is provided on the upper part of the top plate of the support.

[0006] Additional technical features of the sound absorbing structure constituting the above-mentioned sound barrier include: ——The cross beam is a steel section with an I-shaped cross section, the support is a strip steel attached to the surface of the steel section, and parallel longitudinal purlins are arranged between adjacent cross beams, and the longitudinal purlins are placed inside the unit plate or between unit plates adjacent in the transverse direction; The cross section of the longitudinal purlin is [-shaped or H-shaped, and the edge of the sound absorber inside the unit panel is engaged in the groove of the longitudinal purlin; The upper and lower end surfaces of the longitudinal purlins located between the unit panels adjacent in the transverse direction are respectively provided with the supports, and the edges of the unit panels are spliced ​​and engaged by the supports; ——The surface of the front plate and / or back plate of the unit plate is provided with a protrusion with a triangular cross section, and the direction of the protrusion is consistent with the horizontal or vertical direction of the unit plate; - It also includes a telescopic mechanism placed between two adjacent crossbeams, wherein the back plate and the front plate of the unit plate are wavy-shaped, and the edges of the back plate and the front plate are connected by the support arranged on the crossbeam; - A longitudinal purlin located in the telescopic mechanism, one end of which is connected to the crossbeam and the other end is a free end.

[0007] Compared with the prior art, the sound absorption structure of the sound barrier provided by the present invention has the following advantages: since the sound absorption structure of the sound barrier is provided with supports on the upper end face and the lower end face of the cross beam respectively, the back plate and the face plate of the unit plates adjacent in the longitudinal direction are respectively connected by the supports, that is, after the cross beam forms the top surface skeleton, the back plate and the face plate of the unit plate are respectively connected on the upper end face and the lower end face, which increases the thickness of the sound absorber inside the unit plate, and its sound absorption and noise reduction performance is more excellent. Compared with the traditional groove plug-in plate, it is not limited by the groove width, the load of the cross beam steel is reduced, the load on the bridge is reduced, and the closed sound barrier is lighter; as for the specific snap-in connection structure, the cross section of the support is I-shaped, Its bottom plate is connected to the crossbeam, and its top plate is provided with fist parts on both sides respectively. The back plate and the edge of the panel of the unit plate are provided with fist parts respectively. The fist parts and the fist parts cooperate to form a snap-fit ​​mechanism, that is, the fist part and the fist part of the edge are formed by multiple bends. The snap-fit ​​fixation is tight and stable, and can be adjusted on-site according to the foundation construction to adapt to the dimensional error of the load-bearing support, and the sound barrier construction process is efficient. After the above-mentioned edge is snap-fitted and positioned, a buckle cover for covering and fixing the snap-fit ​​mechanism is provided on the upper part of the top plate of the support, which can not only increase the strength of the snap-fit ​​structure, but also improve the sealing of the top surface, avoid noise leakage, rainwater leakage and other problems, and ensure that the sound-absorbing structure is practical and durable, with low maintenance costs in the later use and excellent economic benefits.

[0008] The present invention also provides a new type of closed sound barrier, characterized in that it includes a top cover composed of the sound absorption structure of the above-mentioned sound barrier, two side windows and left and right supports, the two longitudinal side edges of the top cover and the upper part of the support are provided with head plates, and the head plates of the two are connected to the window through a support socket, the support includes a boss with a socket on the top surface, and a groove is provided in the middle of the socket for clamping the transparent plate in the middle of the window, and clamps with wedge-shaped or trapezoidal cross-sections are provided on both sides of the socket, and the clamps cooperate with the grooves arranged on both sides of the end face of the window frame.

[0009] Additional technical features constituting the above-mentioned new closed sound barrier include: ——At least one of the clamping heads on both sides of the socket is movably connected, and is composed of a clamping seat and a clamping block. The clamping seat includes hook grooves on both sides, and claws cooperating with the hook grooves are arranged on both sides of the clamping block; ——The inner surface of the groove of the socket is fitted with a gasket, the side wall of the groove is provided with a tooth groove, and the inner and outer sides of the side wall of the gasket are provided with barbs; ——Slots are arranged on both sides of the boss, and a covering plate is arranged between the slot and the head plate, or a covering plate is arranged between the slot and the top cover and the support plate surface connected to the head plate, one side of the covering plate is placed in the slot, and the other side is provided with a pressing flange, and the middle part of the covering plate is provided with a bend, so that the two sides of the covering plate have a pressing elastic force; ——The middle part of the cladding plate is provided with a cavity formed by multiple bends, which is used to accommodate the top cover connected to the head plate or the end of the supporting side frame plate; The lower part of the support is connected to the railway foundation through a transition platform, and the transition platform includes a positioning plate connected to the top surface of the foundation through bolts. The side of the positioning plate is connected to a quadrilateral platform. The platform includes a vertical side, which is in contact with the side of the foundation. The upper part of the platform is an inclined surface, which is connected to the lower part of the support through a flange plate; ——Cover plates are respectively arranged on both sides of the transition platform, and both side edges of the cover plates are respectively connected to the support and transition platform surfaces.

[0010] Compared with the prior art, a new closed sound barrier provided by the present invention has the following advantages: the top cover and left and right supports of the sound barrier are composed of the aforementioned sound absorbing structure, and on the basis of forming a closed structure, two side windows are added to enhance the internal lighting and improve the defect of poor visual sense of the traditional closed sound barrier, and the two longitudinal side edges of the top cover and the upper part of the support are provided with head plates, and the head plates of the two are connected to the windows through the socket of the support, and the socket-connected structure is adopted to reduce the assembly links such as welding and anchoring, and the construction efficiency is high and the installation cost is low; in terms of the specific structure, the support includes a boss with a socket on the top surface, and a groove is provided in the middle of the socket for clamping the transparent plate in the middle of the window, and clamps with wedge-shaped or trapezoidal cross-sections are provided on both sides of the socket, and the clamps cooperate with the grooves arranged on both sides of the end face of the window frame. The socket is fixed to the frame and transparent plate of the window respectively, and the clamping and positioning are stable, the overall weight is light, the load on the bridge is reduced, and the operation safety is improved. It has the advantages of simple and compact structure, economical and convenient construction, safety, durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of a sound absorbing structure of a sound barrier according to the present invention; Figure 2 This is a partial schematic diagram of the support connection in the sound absorption structure of the sound barrier ( Figure 1 Part A is circled); Figure 3 This is a schematic diagram of the structure of a new type of closed railway sound barrier of the present invention; Figure 4 This is a schematic diagram of the structure of the sound barrier head plate ( Figure 3 The middle circle shows area B) Figure 5 This is a partial enlarged view of the sound barrier socket ( Figure 4 The middle circle shows part C) Figure 6 The structural diagram of the sound barrier transition platform ( Figure 3 The middle circle indicates area D). DETAILED DESCRIPTION

[0012] The sound absorption structure and working principle of the sound barrier provided by the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0013] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "top", "bottom", "longitudinal", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships 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, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0014] It should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "setting" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0015] like Figure 1 , Figure 2 As shown, the sound absorption structure of the sound barrier includes a cross beam 1 arranged side by side in the longitudinal direction and a sound barrier unit plate arranged between the cross beams 1, the upper end face and the lower end face of the cross beam 1 are respectively provided with a support 3, the back plate 21 and the panel 22 of the unit plate adjacent in the longitudinal direction are respectively connected by the support 3, the cross section of the support 3 is I-shaped, the bottom plate 31 thereof is connected to the cross beam 1, and the two sides of the top plate 32 thereof are respectively provided with a fisting part 33, the edges of the back plate 21 and the panel 22 of the unit plate are respectively provided with a fisting part 34, the fisting part 33 cooperates with the fisting part 34 to form a locking mechanism, and the upper part of the top plate of the support 3 is provided with a buckle cover 35 for covering and fixing the locking mechanism.

[0016] Its working principle is as follows: the sound absorption structure of the sound barrier includes a frame formed by beams 1 (generally I-shaped steel) arranged side by side in the longitudinal direction, and unit plates are installed between adjacent beams 1. Since supports 3 are provided on the upper and lower end surfaces of the beams 1, the back plate 21 and the face plate 22 of the unit plate are respectively connected by the supports 3. That is, the beam 1 is hidden inside the sound absorption structure, the top surface is smoother, and it is not easy to leak sound and seepage rain. In addition, the thickness of the sound absorber 5 (generally a rock wool block) inside the unit plate is not limited by the width of the beam 1 groove, which can better play the role of sound absorption and noise reduction. The specific structure of the clamping connection is that the cross section of the support 3 is I-shaped, its bottom plate 31 is connected to the cross beam 1, and the two sides of its top plate 32 are respectively provided with fisting parts 33, and the edges of the back plate 21 and the panel 22 of the unit plate are respectively provided with fisting parts 34, and the fisting parts 33 and the fisting parts 34 are generally composed of multiple folding edges of the edges, and the two cooperate to form a clamping mechanism. The clamping connection A is stable and easy to install. The upper part of the top plate 32 of the support 3 is provided with a buckle cover 35 for covering and fixing the clamping mechanism to ensure a flat surface and a tight closure to prevent sound leakage and rain infiltration; It should be noted that in this patent, when the closed sound barrier is constructed and installed on the bridge, the crossbeam 1 (transverse) refers to the cross section of the bridge, and the longitudinal direction refers to the direction along the bridge.

[0017] In the sound absorbing structure constituting the above-mentioned sound barrier, ——In one embodiment, the cross beam 1 is a steel section with an I-shaped cross section, and the support 3 is a strip steel attached to the surface of the steel section, that is, the strip steel constituting the support 3 can be prefabricated in the factory and installed on the upper and lower end surfaces of the cross beam 1 by welding or bolts, rivets, etc., thereby reducing the processing links on the construction site. The longitudinal purlins 4 arranged side by side between the adjacent cross beams 1 are used to improve the longitudinal structural strength of the unit board and the impact resistance of the closed sound barrier. When the transverse section is composed of a unit board, the longitudinal purlin 4 is placed inside the unit board. When the transverse section width is large and multiple sound barriers need to be spliced, the longitudinal purlin 4 is located between the unit boards adjacent to each other in the transverse direction and in the overlap area between the two, thereby enhancing the stable connection. In the top surface, when the width between adjacent beams 1 is large, multiple unit plates need to be spliced ​​longitudinally, and the adjacent unit plates can also be connected by the above-mentioned support 3; ——Furthermore, the cross section of the longitudinal purlin 4 is [-shaped or H-shaped, and the edge of the sound absorber inside the unit plate is engaged in the groove of the longitudinal purlin 4, which can effectively position the sound absorber 5. The two ends of the longitudinal purlin 4 and the cross beam 1 can be fixed by welding, or a socket joint method can be selected, such as inserting the end of the longitudinal purlin 4 into the groove of the cross beam 1, and then positioning it by bolts or rivets on the connecting piece 6; ——Preferably, the upper and lower end surfaces of the longitudinal purlins 4 located between the unit panels adjacent in the transverse direction are respectively provided with supports 3, and the edges of the unit panels are spliced ​​and connected by the supports 3, that is, when the transverse amplitude of the top surface is large, the unit panels are spliced ​​by multiple pieces, and the longitudinal purlins 4 play a lap role. The unit panels (panel 22, back panel 21) are also connected by the above supports 3, further hiding the longitudinal purlins 4 to ensure the flatness of the top surface; ——Preferably, the surface of the front panel 22 and / or the back panel 21 of the above-mentioned unit panel is provided with a protrusion 23 with a triangular cross section. The protrusion 23 can be formed by bending a plate, and the cross section can also be selected in a variety of ways, such as square, circular, trapezoidal, etc. The direction of the protrusion 23 is consistent with the horizontal or vertical direction of the unit panel, which can also play a role in enhancing the mechanical strength of the unit panel and preventing the panel surface from being dented, twisted, wrinkled, etc. due to impact; In one embodiment, when the closed sound barrier of the sound absorbing structure is installed at the expansion joint of the bridge, it also includes a telescopic mechanism 7 placed between two adjacent beams 1, and the back plate 21 and the face plate 22 of the unit plate are wave-shaped bends 71, and the edges of the back plate 21 and the face plate 22 are connected by the support 3 arranged on the beam 1, that is, the two beams 1 are respectively placed on both sides of the expansion joint, and the unit plate in the middle can be freely expanded and contracted through the wave-shaped bends to meet the deformation requirements; ——Furthermore, the longitudinal purlin 4 located in the above-mentioned telescopic mechanism has one end connected to the cross beam 1 to form a fixed end, and the other end is a free end. The fixed ends of multiple longitudinal purlins 4 arranged side by side can be respectively connected to the cross beams 1 on both sides of the expansion joint, and the positions are staggered to achieve the effect of balancing the load.

[0018] Based on the above sound absorbing structure, the present invention also provides a new closed sound barrier, such as Figure 3-6 As shown, the structure of the new closed railway sound barrier includes a top cover 1' with the above-mentioned sound absorption structure, left and right supports 3' and windows 2' on both sides. The two longitudinal sides of the top cover 1' and the upper part of the support 3' are provided with head plates 4', and the head plates 4' of the two are connected to the windows 2' through a support socket. The support includes a boss 52' with a socket 51' on the top surface, and a groove 53' is provided in the middle of the socket 51' for clamping the transparent plate 21' in the middle of the window 2'. Clamps 54' with wedge-shaped or trapezoidal cross-sections are provided on both sides of the socket 51', and the clamps 54' cooperate with the grooves 23' arranged on both sides of the end face of the window frame 22'.

[0019] Its working principle is: the new sound barrier is composed of a top cover 1', two side windows 2' and left and right supports 3' to form a closed arch structure. Different from the traditional closed sound barrier, the two side windows 2' are respectively connected to the top cover 1' and the support 3' through the sockets 51' on the head plate 4', with high assembly efficiency and low construction cost; the overall quality is light, the load on the bridge is small, and it is stable and safe.

[0020] Specifically, the support includes a boss 52' with a socket 51' on the top surface, a groove 53' is provided in the middle of the socket 51', which is used to engage the transparent plate 21' in the middle of the window 2', and clamping heads 54' with wedge-shaped or trapezoidal cross-sections are provided on both sides of the socket 51'. The clamping heads 54' cooperate with the grooves 23' provided on both sides of the end surface of the frame of the window 2'. The socket 51' is connected to the frame 22 and the transparent plate 21' of the window 2' in steps, and the connection and installation are convenient, the engagement and positioning are stable, and the load-bearing force is balanced.

[0021] It should be noted that when the closed sound barrier is used on a railway bridge a, "longitudinal" refers to the direction along the bridge, and "left, right" and "both sides" refer to the direction of the cross-section of the bridge; the above-mentioned top cover 1' and support 3' are composed of the aforementioned sound-absorbing structure, and the window 2' is positioned by the frame 22' profile through the angle code, and a transparent plate 21' is installed in the frame, and the transparent plate 21' has a sound insulation function and is generally an acrylic plate.

[0022] In the structure constituting the above-mentioned new closed railway sound barrier, --like Figure 4 As shown, in one embodiment, in order to facilitate the socket docking of the window 2' with the support 3' and the head plate 4' of the top cover 1', at least one of the clamps on both sides of the socket 51' of the head plate 4' is a movable clamp 54-1, which is composed of a clamp seat and a clamp block. The clamp seat includes hook grooves 61' on both sides. The clamp seat and the socket 51' are an integral structure. The openings of the hook grooves 61' are opposite to each other. Claws 62' that cooperate with the hook grooves 61' are arranged on both sides of the clamp block. The cross section of the clamp block is consistent with the cross section shape of the clamp head, which can be made of steel or bent into steel plate. The claws 62' of the clamp block are inserted into the hook grooves 61' to position the clamp head 54-1. The detachable and assembled clamp head 54-1 is used to facilitate the socket connection of the frame 22' of the window 2' after the transparent plate 21' of the window 2' is inserted and positioned; --like Figure 5 As shown, preferably, a gasket 7' is attached to the inner surface of the groove 53' of the socket 51'. The gasket 7' can be made of rubber or plastic, fills the snap-fitting gap to prevent impact loosening, and can also enhance the elastic buffering of the window 2' transparent plate 21' to prevent the plate from being damaged. The side wall of the groove 53' of the socket 51' is provided with a tooth groove 50', and the inner and outer sides of the side wall of the gasket 7' are provided with barbs 71', that is, the snap-fitting strength of the window 2' transparent plate 21' is improved to prevent it from loosening, and it can be tightly sealed to prevent sound leakage and water seepage; ——Furthermore, in order to encapsulate and conceal the socket connection parts of the window 2' and the top cover 1' and the support 3', respectively, and improve the beauty and regular appearance, a covering plate 8' is added to the head plate 4', and slots 521' are provided on both sides of the boss 52'. The covering plate 8' is placed between the slot 521' and the head plate 4', and can also be placed between the slot 521' and the top cover 1' and the support 3' plate surface connected to the head plate 4'. One side of the covering plate 8' is placed in the slot 521', and the cross section of the slot 521' is inclined or horizontal, which is adapted to the bending of one side of the covering plate 8'. The other side thereof is provided with a pressing flange 81', and the middle part of the covering plate 8' is provided with a bending 82', so that the two side edges of the covering plate 8' have a pressing elastic force, and the covering plate 8' is attached to the socket joint part; ——Furthermore, another cladding plate 8-1 is provided with a cavity 83' formed by multiple bends in the middle, which is used to accommodate the end of the top cover 1' or the side frame plate of the support 3' connected to the head plate 4', especially the outer side of the lower end of the top cover 1', which is often provided with redundancy to improve the dimensional error of the connection with the support 3' at the construction site. The cavity 83' in the cladding plate 8-1 can perfectly hide the end of the profile, thereby improving the aesthetics and regularity of the closed sound barrier; --like Figure 6 As shown, in one embodiment, the lower part of the support 3' is connected to the railway foundation b through a transition platform to adapt to the dimensional error between the installation of the sound barrier support 3' and the construction of the bridge foundation b. Specifically, the transition platform includes a positioning plate 91' connected to the top surface of the foundation b through embedded bolts 92', and the outer side of the positioning plate 91' is connected to a quadrilateral platform 93'. The platform 93' includes a vertical side 931', which fits the side of the foundation b. The vertical side 931' plate is perpendicular to the positioning plate 91', providing support for the transition platform. The upper part of the platform 93' is an inclined surface 932', which is connected to the lower part of the support 3' through a flange plate 94' (welded or bolted), and bears the load of the entire sound barrier. The outer side of the platform 93' is a connecting edge 933', which stabilizes the shape of the platform 93' and limits the displacement of the support 3'. - Further, covering plates 90' are respectively arranged on both sides of the above transition platform, and both side edges of the covering plates 90' are respectively connected to the support 3' and the surface of the transition platform, and the covering plates 90' play the role of decoration and tight sealing.

[0023] The above-described embodiments are only used to illustrate the technical solution of the present invention, and are not limiting conditions for the implementation of the present invention. Therefore, any other modifications or equivalent replacements of configuration dimensions and internal structures made to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be included in the scope of the claims of the present invention.

Claims

1. A sound absorbing structure of a sound barrier, comprising beams arranged side by side in a longitudinal direction and a sound barrier unit plate arranged between the beams, characterized in that: Supports are respectively provided on the upper end face and the lower end face of the crossbeam, and the back plates and the face plates of the unit plates adjacent in the longitudinal direction are respectively connected by snap-fitting through the supports, or a plurality of unit plates are provided between adjacent crossbeams, and the adjacent unit plates are also connected by snap-fitting through the supports. The cross section of the support is I-shaped, and its bottom plate is connected to the crossbeam, and fisting parts are respectively provided on both sides of its top plate, and fisting parts are respectively provided on the edges of the back plate and the face plate of the unit plate, and the fisting parts cooperate with the fisting parts to form a snap-fitting mechanism, and a buckle cover for covering and fixing the snap-fitting mechanism is provided on the upper part of the top plate of the support.

2. The sound absorbing structure of a sound barrier according to claim 1, characterized in that: The horizontal The beam is a steel section with an I-shaped cross section, the support is a strip steel attached to the surface of the steel section, and parallel longitudinal purlins are arranged between adjacent beams. The longitudinal purlins are placed inside the unit plates or between unit plates adjacent in the transverse direction.

3. The sound absorbing structure of a sound barrier according to claim 2, characterized in that: The cross section of the longitudinal purlin is [-shaped or H-shaped, and the edge of the sound absorber inside the unit panel is engaged in the groove of the longitudinal purlin.

4. The sound absorbing structure of a sound barrier according to claim 2, characterized in that: The upper end surface and the lower end surface of the longitudinal purlin located between the unit plates adjacent in the transverse direction are respectively provided with the supports, and the edges of the unit plates are spliced ​​and engaged by the supports.

5. The sound absorbing structure of a sound barrier according to claim 1, characterized in that: The surface of the front plate and / or the back plate of the unit plate is provided with a protrusion with a triangular cross section, and the direction of the protrusion is consistent with the horizontal or vertical direction of the unit plate.

6. The sound absorbing structure of a sound barrier according to claim 1, characterized in that: It also includes a telescopic mechanism placed between two adjacent crossbeams, wherein the back plate and the front plate of the unit plate are wavy-shaped bends, and the edges of the back plate and the front plate are connected by clamping the supports arranged on the crossbeams.

7. The sound absorbing structure of a sound barrier according to claim 6, characterized in that: One end of the longitudinal purlin located in the telescopic mechanism is connected to the crossbeam, and the other end is a free end.

8. A new type of closed sound barrier, characterized by: It includes a top cover composed of the sound absorption structure of the sound barrier according to any one of claims 1 to 7, two side windows and left and right supports, the two longitudinal side edges of the top cover and the upper part of the supports are provided with head plates, the head plates of the two are connected to the windows by a support socket, the support includes a boss with a socket on the top surface, a groove is provided in the middle of the socket for clamping the transparent plate in the middle of the window, and clamps with wedge-shaped or trapezoidal cross-sections are provided on both sides of the socket, and the clamps cooperate with the grooves arranged on both sides of the end faces of the window frame.

9. The sound absorbing structure of a sound barrier according to claim 8, characterized in that: At least one of the clamping heads on both sides of the socket is movably connected and is composed of a clamping seat and a clamping block. The clamping seat includes hook grooves on both sides, and claws cooperating with the hook grooves are arranged on both sides of the clamping block.

10. The novel closed railway sound barrier according to claim 8 is characterized by: The inner surface of the groove of the socket is fitted with a gasket, the side wall of the groove is provided with a tooth groove, and the inner and outer sides of the side wall of the gasket are provided with barbs.

11. The novel closed railway sound barrier according to claim 8 is characterized by: Slots are arranged on both sides of the boss, and a covering plate is arranged between the slot and the head plate, or a covering plate is arranged between the slot and the top cover and the support plate surface connected to the head plate. One side of the covering plate is placed in the slot, and the other side is provided with a pressing flange. The middle part of the covering plate is provided with a bend so that the two side edges of the covering plate have a pressing elastic force.

12. The novel closed railway sound barrier according to claim 8 is characterized by: The lower part of the support is connected to the railway foundation through a transition platform, and the transition platform includes a positioning plate connected to the top surface of the foundation by bolts. The side of the positioning plate is connected to a quadrilateral platform body, and the platform body includes a vertical side, which is in contact with the side of the foundation. The upper part of the platform body is an inclined surface, which is connected to the lower part of the support through a flange plate.

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