CN109281269B - Cleaning system for semi-closed sound barrier - Google Patents
Cleaning system for semi-closed sound barrier Download PDFInfo
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- CN109281269B CN109281269B CN201710597890.2A CN201710597890A CN109281269B CN 109281269 B CN109281269 B CN 109281269B CN 201710597890 A CN201710597890 A CN 201710597890A CN 109281269 B CN109281269 B CN 109281269B
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- Prior art keywords
- cleaning
- semi
- sound barrier
- sliding rail
- cleaning system
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- 238000004140 cleaning Methods 0.000 title claims abstract description 108
- 230000004888 barrier function Effects 0.000 title claims abstract description 44
- 238000009413 insulation Methods 0.000 claims abstract description 31
- 238000010521 absorption reaction Methods 0.000 claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 25
- 239000010959 steel Substances 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 48
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000000712 assembly Effects 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 4
- 230000003111 delayed effect Effects 0.000 abstract description 2
- 239000000428 dust Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 3
- 210000002457 barrier cell Anatomy 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
- E01H1/005—Mobile installations, particularly for upkeeping in situ road or railway furniture, for instance road barricades, traffic signs; Mobile installations particularly for upkeeping tunnel walls
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention provides a cleaning system for a semi-closed sound barrier, which comprises cleaning components for cleaning the sound absorption and insulation wall, sliding rail components 2 positioned at two ends of the cleaning components and used for the cleaning components to move, and power components for driving the cleaning components to move, wherein the number of the sliding rail components is at least two and not crossed with each other, the sliding rail components are respectively fixed on a steel upright post, and the number of the power components is two, and the power components are respectively positioned at two sides of the semi-closed sound barrier. Only one worker is required to stand on the ground for operation, the personal safety is effectively ensured; the cleaning speed of the cleaning system is far superior to the manual cleaning speed, but also can be opened at any time, the driving safety and the falling of components are not delayed, and the safety control device has good use experience and safety; the cleaning system has strong structural adaptability and wide application prospect.
Description
Technical Field
The present invention relates to a cleaning system for a semi-enclosed sound barrier.
Background
The existing semi-closed sound barrier is a transparent sound absorbing and insulating wall which is composed of profile steel and a transparent plate (pc plate or acrylic plate) or an opaque sound barrier, has the advantages of attractive appearance, good sound absorbing and insulating performance and the like, is commonly used for railways, highways, bridges, municipal administration and the like, and is easy to pollute by dust, difficult to clean and the like due to the fact that the sound barrier is usually positioned at two sides of a road and dust and rainwater dew combined action of vehicles lift, and has the defects that a large amount of dust, scraps and the like are accumulated on the surface of the sound barrier, so that the attractive appearance and the visual field are influenced, if the sound barrier is pre-cleaned, a large amount of manpower and material resources are required to be input, and driving cannot be performed during the cleaning, so that the cleaning device which can clean at any time, avoids high-altitude operation, and does not influence driving time and safety becomes a problem to be solved urgently.
Disclosure of Invention
The present invention is directed to a cleaning system for a semi-enclosed sound barrier, which overcomes the above-mentioned drawbacks of the prior art.
The cleaning system for the semi-closed sound barrier provided by the invention adopts the main technical scheme that: the utility model provides a cleaning system for sound barrier, semi-closed sound barrier includes steel stand and sets up adjacent sound barrier cell board between the steel stand, steel stand is type inverted U-shaped structure, steel stand and sound barrier cell board constitute type inverted U-shaped structure's sound absorption and insulation wall jointly, a cleaning system for semi-closed sound barrier is including being used for wasing the clean subassembly of sound absorption and insulation wall, be located clean subassembly both ends and supply the slide rail subassembly that this clean subassembly removed and the power pack that pulls clean subassembly removes, slide rail subassembly is two at least and each other do not intersect, and it is fixed respectively on the steel stand, power pack is two, it is located respectively the both sides of semi-closed sound barrier, slide rail subassembly includes track and the pulley assembly of arranging in the track, the track is fixed on the steel stand and along inhale sound insulation wall surface longitudinal extension, still includes and is used for to inhale the water supply system of wall surface watering.
The sliding rail assembly comprises rails and pulley assemblies respectively arranged in the rails 21, and the rails are fixed on the steel upright posts and extend longitudinally along the sound absorption and insulation wall surface.
The cleaning assembly comprises a cleaning tool and a supporting rod for fixing the cleaning tool, two ends of the supporting rod are respectively connected with the pulley assembly, and the supporting rod transversely extends along the surface of the sound absorption and insulation wall.
The cleaning assembly comprises a cleaning tool and a frame for fixing the cleaning tool, the frame is of a square structure formed by connecting supporting rods, four corners of the square structure are respectively connected with one pulley assembly, and the cleaning tool is fixed on the supporting rods which transversely extend along the surface of the sound absorption and insulation wall. The width of the frame in the longitudinal direction is 0.1 m-5 m, and the width in the transverse direction is 0.1 m-20 m.
The pulley assembly comprises a bearing and a bracket fixedly connected with the bearing.
The rail is a C-shaped section bar, the bracket comprises a cross beam and L-shaped angle steel fixedly connected with the cross beam, at least one bearing is respectively connected with two ends of the cross beam, and the L-shaped angle steel extends out of the C-shaped section bar.
The sound absorption and insulation wall comprises a support, a sound absorption and insulation wall body and a distance adjusting structure, wherein the distance adjusting structure is fixed on the support, and two ends of a supporting rod extending transversely along the surface of the sound absorption and insulation wall body are connected with the distance adjusting structure.
The distance adjusting structure is a circular ring or a cylindrical sleeve, the circular ring or the cylindrical sleeve is fixed on the support, and two ends of the supporting rod extending transversely along the surface of the sound absorbing and insulating wall penetrate through the circular ring or the cylindrical sleeve.
The cleaning tool can be selected from one or a combination of a plurality of brushes, sponges, rags or glass scrapers.
The power assembly drives the water sprinkling system, and the water sprinkling system comprises a water tank, a water pump and a water guide pipe.
And a water spraying hole is formed in the water guide pipe.
The water supply device also comprises a moving device capable of driving the water supply device to move.
The power component is a walking motor vehicle, the motor vehicle comprises a motor, a controller, a vehicle body, wheels and a transmission structure, and the cleaning component is connected with the vehicle body.
The motor vehicle is characterized by further comprising a rail for the motor vehicle to walk, wherein the wheels are provided with teeth, and the rail is provided with grooves corresponding to the teeth.
The cleaning device further comprises a transmission structure for simultaneously connecting the cleaning component and the power component, wherein the transmission structure is of a quadrilateral, triangle or polygon-like structure.
The cleaning system for the semi-closed sound barrier has the beneficial effects that: the semi-closed sound barrier cleaning device can be used for cleaning the existing semi-closed sound barrier, and can be operated by only one worker standing on the ground, so that a large number of cleaning tools and sea tactics adopted by the traditional cleaning method are avoided; the cleaning speed of the cleaning system is far better than the manual cleaning speed, and the cleaning speed can be selected according to actual requirements, and the speed of travel of the power assembly can be fast or slow by controlling the speed of travel of the power assembly; most importantly, the cleaning system can be started at any time, and can perform cleaning operation even when the vehicle is running, so that running safety and cleaning personnel safety are not delayed, and good use experience and safety are achieved; the cleaning system has the advantages of strong structural adaptability, no need of additional auxiliary structure, light structure, easy replacement of wearing parts, effective cost reduction, easy manufacture and wide application prospect.
Drawings
FIG. 1 is a schematic view of a first embodiment assembled to an upstanding sound barrier;
FIG. 2 is a schematic structural view of a second embodiment assembled to an upstanding sound barrier;
FIG. 3 is an enlarged view of the structure of the portion A in FIG. 1;
FIG. 4 is an enlarged view of the structure of the portion B in FIG. 1;
FIG. 5 shows the second embodiment assembled to schematic structural diagram of arc sound barrier;
FIG. 6 is A of FIG. 5 an enlarged view of the part structure;
fig. 7 is an enlarged view of the B portion structure in fig. 5.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 7, the embodiment of the present invention provides a cleaning system for a semi-closed sound barrier, where the semi-closed sound barrier includes steel columns 5 and sound barrier unit plates 6 disposed between adjacent steel columns 5, the steel columns 5 and sound barrier unit plates 6 together form a sound absorption and insulation wall, the sound absorption and insulation wall is in an upright or arc structure, the cleaning system includes a cleaning component 1 for cleaning the sound absorption and insulation wall and a sliding rail component 2 located at two ends of the cleaning component 1 and used for moving the cleaning component 1, in order to make the cleaning component 1 walk along a fixed direction, avoid a situation of running or falling, at least two sliding rail components 2 are fixed on the steel columns 5 respectively and can be fixed by means of screws, rivets or welding, etc., the sliding rail components 2 extend longitudinally along the surface of the sound absorption and insulation wall, the cleaning component 1 extends transversely along the surface of the sound absorption and insulation wall, the longitudinal direction is the extending direction of the semi-closed sound barrier, and the sliding rail component 2 is perpendicular or nearly perpendicular to the longitudinal direction, and the sliding rail component 2 is fixed on the back surface of the sound absorption and insulation system.
As shown in fig. 1, 2 and 5, in particular, the sliding rail assembly 2 includes a rail 21 and a pulley assembly disposed in the rail 21, and the rail 21 is fixed to the steel upright 5 and extends longitudinally along the sound absorbing and insulating wall surface.
As shown in fig. 1, as an alternative structure, the cleaning assembly 1 includes a cleaning tool 12 and a supporting rod 11 for fixing the cleaning tool 12, two ends of the supporting rod 11 are respectively connected with the pulley assemblies, and the supporting rod 11 extends transversely along the surface of the sound absorbing and insulating wall; as shown in fig. 2 and 5, as a second structural option, the cleaning assembly 1 includes a cleaning tool 12 and a frame for fixing the cleaning tool 12, the frame is a square structure formed by connecting supporting rods 11, four corners of the square structure are respectively connected with one pulley assembly, the cleaning tool 12 is fixed on the supporting rods 11 extending transversely along the surface of the sound absorbing and insulating wall, the width of the frame along the longitudinal direction is 0.1 m-5 m, the width along the transverse direction is 0.1 m-20 m, and in order to avoid the pulley assembly from being blocked in the track 21 due to deformation in the moving process, a reinforcing rod can be arranged in the middle of the frame to strengthen the rigidity of the frame. When the sound absorption and insulation wall is a plane, the frame is of a plane structure, and when the sound absorption and insulation wall is of a curved surface, the frame is of a curved surface structure consistent with the curvature of the sound absorption and insulation wall along the curved surface.
The pulley assembly comprises a bearing 22 and a bracket 23 fixedly connected with the bearing 22, wherein the bracket 23 extends out of the rail 21, specifically, the rail 21 is a C-shaped section, the bracket 23 comprises a cross beam and L-shaped angle steel fixedly connected with the cross beam, two ends of the cross beam are respectively connected with at least one bearing 22, and the L-shaped angle steel extends out of the C-shaped section.
In order to avoid design and installation errors, the cleaning device further comprises a distance adjusting structure 24, wherein the distance adjusting structure 24 is fixed on the support 23, two ends of the cleaning assembly 1 are connected with the distance adjusting structure 24, and specifically, two ends of the supporting rod 11 extending transversely along the surface of the sound absorbing and insulating wall are connected with the distance adjusting structure 24. Specifically, the distance adjusting structure 24 is a ring or a cylindrical sleeve, the ring or the cylindrical sleeve is fixed on the support 23, more specifically, the ring or the cylindrical sleeve is fixed on the L-shaped angle steel, the fixing mode can be welding, screwing or riveting, two ends of the supporting rod 11 extending transversely along the surface of the sound absorbing and insulating wall penetrate through the ring or the cylindrical sleeve, the supporting rod 11 moves in the ring or the cylindrical sleeve to adjust the distance between the adjacent sliding rail assemblies 2, so that the pulley assemblies are prevented from being clamped by the sliding rail assemblies 2, and the brushing efficiency is prevented from being influenced.
The cleaning tool 12 may be selected from one or a combination of brushes, sponges, wipes, or glass scrapers. Specifically, when the cleaning tool moves, the wet sponge or the wet rag can be used for wiping the sound absorption and insulation wall preferentially, and then the glass is used for scraping the sound absorption and insulation wall, so that the purposes of cleaning and preventing water drops from remaining are achieved.
For convenient water adding, the water supply system is used for sprinkling water to the surface of the sound absorption and insulation wall, and the water supply system can sprinkle water to the surface of the sound absorption and insulation wall so as to moisten dust or other attachments on the surface of the sound absorption and insulation wall, so that the sound absorption and insulation wall is easier to clean. The water supply system is consistent with the movement direction of the cleaning assembly, and preferably moves synchronously, so as to achieve the purposes of sprinkling water and cleaning. Alternatively, the water supply system comprises a water collection tank and a water guide pipe communicated with the water collection tank, the water collection tank is higher than the cleaning system, and a switch is arranged at a water inlet of the water guide pipe; as a second option, the water supply system comprises a water tank, a water pump and a water guide pipe, wherein the water tank can move along the longitudinal extending direction of the semi-closed sound barrier, specifically, the water tank can be manually driven to move, and a moving device can be additionally arranged to drive the water tank to move. In order to increase the spraying area and improve the water utilization efficiency, the water guide pipe can be provided with water spraying holes which are micropores so as to spray mist or nearly mist spray water.
In order to increase the automation degree of the cleaning system, a power assembly 3 for driving the cleaning assembly 1 to move can be further arranged, the power assembly 3 is a motor vehicle capable of walking, the motor vehicle comprises a motor, a controller, a vehicle body, wheels and a transmission structure, and the cleaning assembly is connected with the vehicle body.
The motor vehicle can smoothly move forward, the friction force or binding force between the motor vehicle and the bottom surface or the rail is increased, the motor vehicle is prevented from backing or slipping, the motor vehicle further comprises a rail for the motor vehicle to walk, the wheels are provided with teeth, and the rail is provided with grooves corresponding to the teeth. In order to achieve the connection between the cleaning assembly 1 and the power assembly 3, the cleaning assembly further comprises a transmission structure for simultaneously connecting the cleaning assembly 1 and the power assembly 3, wherein the transmission structure is a quadrilateral, triangular or polygonal frame structure, and the frame structure is not easy to deform so as to drive the cleaning assembly to move forwards.
The above embodiment is only one of the preferred embodiments of the present invention, and the ordinary changes and substitutions made by those skilled in the art within the scope of the present invention should be included in the scope of the present invention.
Claims (13)
1. A cleaning system for a semi-closed sound barrier, the semi-closed sound barrier comprises steel upright posts (5) and sound barrier unit plates (6) arranged between the adjacent steel upright posts (5), the steel upright posts (5) and the sound barrier unit plates (6) jointly form a sound absorption and insulation wall, the sound absorption and insulation wall is of an upright or arc-shaped structure, and the cleaning system is characterized by comprising a cleaning component (1) for cleaning the sound absorption and insulation wall and sliding rail components (2) which are positioned at two ends of the cleaning component (1) and used for the cleaning component (1) to move, the sliding rail components (2) are at least two and do not cross each other, the sliding rail components (2) are respectively fixed on the steel upright posts (5), the sliding rail components (2) longitudinally extend along the surface of the sound absorption and insulation wall, the cleaning component (1) transversely extends along the surface of the sound absorption and insulation wall, the cleaning system is fixed on the back surface or the arc-shaped structure of the sound absorption and insulation wall, the sliding rail components (2) comprise rails (21) and sliding rail components (2) which are arranged in the rails (21), the sliding rail components (21) are fixed on the two ends of the cleaning component (1) and are mutually non-crossed, and the sliding rail components are respectively fixed on the steel upright posts, and the sliding rail components are respectively arranged on the surface of the steel upright post, and the sliding rail components are fixed on the sliding rail components, and the sliding rail structures, and the sliding rail.
2. The cleaning system for a semi-enclosed sound barrier according to claim 1, wherein the cleaning assembly (1) comprises a cleaning tool (12) and a supporting rod (11) for fixing the cleaning tool (12), two ends of the supporting rod (11) are respectively connected with the pulley assemblies, and the supporting rod (11) transversely extends along the surface of the sound absorbing and insulating wall.
3. A cleaning system for a semi-enclosed sound barrier according to claim 1, wherein the cleaning assembly (1) comprises a cleaning tool (12), a frame for fixing the cleaning tool (12), the frame being a square structure formed by connecting support rods (11), four corners of the square structure being respectively connected with one pulley assembly, the cleaning tool (12) being fixed on the support rods (11) extending transversely along the surface of the sound absorbing and insulating wall.
4. A cleaning system for a semi-enclosed sound barrier according to claim 1, characterized in that the pulley assembly comprises a bearing (22) and a bracket (23) fixedly connected to the bearing (22), the bracket (23) protruding out of the track (21).
5. A cleaning system for a semi-enclosed sound barrier according to claim 4, wherein the track (21) is a C-profile, the support extending outside the C-profile.
6. A cleaning system for a semi-enclosed sound barrier according to claim 4, characterized in that on the track (21) the cleaning assembly (1) is connected at both ends with distance adjusting structures (24).
7. The cleaning system for a semi-enclosed sound barrier according to claim 6, wherein the distance adjusting structure (24) is a ring or a cylindrical sleeve in which both ends of the cleaning assembly (1) are inserted.
8. A cleaning system for a semi-enclosed sound barrier according to claim 2 or 3, wherein the cleaning means (12) is selected as one or a combination of several of a brush, a sponge, a wipe or a glass wiper.
9. The cleaning system for a semi-enclosed sound barrier of claim 1, wherein the water supply system comprises a water collection tank and a water conduit in communication with the water collection tank, the water collection tank being higher than the cleaning system, the water conduit having a water inlet provided with a switch.
10. The cleaning system for a semi-enclosed sound barrier of claim 1, wherein the water supply system comprises a water tank, a water pump, and a water conduit.
11. The cleaning system for a semi-enclosed sound barrier of claim 1, further comprising a moving device for moving the water supply.
12. A cleaning system for a semi-enclosed sound barrier according to claim 1, characterized in that the cleaning system further comprises a power assembly (3) which can drive the cleaning assembly (1) to move.
13. The cleaning system for a semi-enclosed sound barrier of claim 12, wherein the power assembly is a walkable motor vehicle including a motor, a controller, a vehicle body, wheels and a transmission, the cleaning assembly being coupled to the vehicle body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710597890.2A CN109281269B (en) | 2017-07-21 | 2017-07-21 | Cleaning system for semi-closed sound barrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710597890.2A CN109281269B (en) | 2017-07-21 | 2017-07-21 | Cleaning system for semi-closed sound barrier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109281269A CN109281269A (en) | 2019-01-29 |
| CN109281269B true CN109281269B (en) | 2023-12-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710597890.2A Active CN109281269B (en) | 2017-07-21 | 2017-07-21 | Cleaning system for semi-closed sound barrier |
Country Status (1)
| Country | Link |
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| CN (1) | CN109281269B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110219257A (en) * | 2019-07-15 | 2019-09-10 | 西藏中驰集团股份有限公司 | A kind of cleaning system for sound barrier |
| CN112878217B (en) * | 2020-11-27 | 2022-04-26 | 山西军昊实业有限公司 | Closed type track sound insulation barrier |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2319176A1 (en) * | 1975-07-25 | 1977-02-18 | Seal Baticlub | Sound insulating barrier for motorways - has vertical posts and horizontal rails defining frame for sound insulating elements |
| KR100934277B1 (en) * | 2009-05-22 | 2009-12-28 | 주식회사 세흥휴프텍 | Cleanning device for transparent noise-barrier wall |
| KR20110067434A (en) * | 2009-12-14 | 2011-06-22 | 주식회사 이건 | Washing device for platform screen door |
| CN203065978U (en) * | 2013-01-11 | 2013-07-17 | 广州地铁设计研究院有限公司 | Rail transit arc and short sound barrier |
| CN106498883A (en) * | 2016-11-02 | 2017-03-15 | 长安大学 | A kind of Multifunctional two-sided is while cleaning device |
| CN106592476A (en) * | 2016-11-02 | 2017-04-26 | 长安大学 | Omnibearing washing mechanism for highway sound barrier |
| CN207331560U (en) * | 2017-07-21 | 2018-05-08 | 西藏中驰集团股份有限公司 | A kind of cleaning system for semiclosed sound barrier |
-
2017
- 2017-07-21 CN CN201710597890.2A patent/CN109281269B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2319176A1 (en) * | 1975-07-25 | 1977-02-18 | Seal Baticlub | Sound insulating barrier for motorways - has vertical posts and horizontal rails defining frame for sound insulating elements |
| KR100934277B1 (en) * | 2009-05-22 | 2009-12-28 | 주식회사 세흥휴프텍 | Cleanning device for transparent noise-barrier wall |
| KR20110067434A (en) * | 2009-12-14 | 2011-06-22 | 주식회사 이건 | Washing device for platform screen door |
| CN203065978U (en) * | 2013-01-11 | 2013-07-17 | 广州地铁设计研究院有限公司 | Rail transit arc and short sound barrier |
| CN106498883A (en) * | 2016-11-02 | 2017-03-15 | 长安大学 | A kind of Multifunctional two-sided is while cleaning device |
| CN106592476A (en) * | 2016-11-02 | 2017-04-26 | 长安大学 | Omnibearing washing mechanism for highway sound barrier |
| CN207331560U (en) * | 2017-07-21 | 2018-05-08 | 西藏中驰集团股份有限公司 | A kind of cleaning system for semiclosed sound barrier |
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| Publication number | Publication date |
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| CN109281269A (en) | 2019-01-29 |
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