CN111946145A - Building engineering encloses fender - Google Patents
Building engineering encloses fender Download PDFInfo
- Publication number
- CN111946145A CN111946145A CN202010816189.7A CN202010816189A CN111946145A CN 111946145 A CN111946145 A CN 111946145A CN 202010816189 A CN202010816189 A CN 202010816189A CN 111946145 A CN111946145 A CN 111946145A
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- CN
- China
- Prior art keywords
- perforated panel
- holes
- silencing
- hole
- sound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H17/00—Fencing, e.g. fences, enclosures, corrals
- E04H17/14—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts
- E04H17/16—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts using prefabricated panel-like elements, e.g. wired frames
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
- E04B1/86—Sound-absorbing elements slab-shaped
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Multimedia (AREA)
- Electromagnetism (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention discloses a building engineering enclosure, which comprises a first perforated panel and a second perforated panel, wherein a resonant cavity is formed between the first perforated panel and the second perforated panel, an air layer is arranged in the resonant cavity, a silencing tube is arranged in the resonant cavity, first through holes are uniformly arranged on the first perforated panel, second through holes are uniformly arranged on the second perforated panel, two ends of the silencing tube are respectively connected with the first through holes and the second through holes, an air flow channel is arranged in the middle of the silencing tube and is communicated with the first through holes and the second through holes, silencing holes are formed in the outer walls around the silencing tube, the silencing holes are communicated with the air flow channel, and the aperture of the silencing holes is smaller than that of the air flow channel; the sound waves pass through the silencing holes and enter the resonant cavity to reduce noise.
Description
Technical Field
The invention relates to the field of constructional engineering construction, in particular to a constructional engineering fence.
Background
At present, when municipal road construction is carried out, a project enclosure is used, and the use of the project enclosure is different according to different construction sites and conditions. The building engineering must be totally closed, the main road or people flow in the city area is not less than 2.5 meters, the rest is not less than 1.8 meters, generally, semi-closure is commonly seen in municipal engineering, so-called semi-closure means that two or three sides are provided with a fence, one or two sides are open, and the material of construction machines can be conveniently fed in and out. How to set is determined according to bidding documents, drawings and site environment under the condition of ensuring safety of construction organization design.
The engineering that present municipal works were used encloses the fender and mainly has following defect: 1. the surface of the enclosure for municipal engineering construction is mostly a single-layer profiled steel sheet, so that sound absorption and noise reduction cannot be realized, and noise trouble is often brought to nearby residents; 2. the existing building engineering enclosure is not windproof, and when typhoon occurs, the building engineering enclosure collapses to hurt people. 3. The existing building engineering enclosure is light-tight, and influences lighting and sight of nearby residents.
Disclosure of Invention
In view of the above, the invention provides a building engineering enclosure, which realizes triple effects of light transmission, wind prevention, sound absorption and noise reduction.
On one hand, the invention provides a building engineering enclosure, which comprises a first perforated panel and a second perforated panel, wherein a resonant cavity is formed between the first perforated panel and the second perforated panel, an air layer is arranged in the resonant cavity, a silencing tube is arranged in the resonant cavity, first through holes are uniformly arranged on the first perforated panel, second through holes are uniformly arranged on the second perforated panel, two ends of the silencing tube are respectively connected with the first through holes and the second through holes, an air flow channel is arranged in the middle of the silencing tube and is communicated with the first through holes and the second through holes, silencing holes are formed in the peripheral outer walls of the silencing tube, the silencing holes are communicated with the air flow channel, and the aperture of the silencing holes is smaller than that of the air flow channel; the sound waves pass through the silencing holes and enter the resonant cavity to reduce noise.
In order to further absorb sound and reduce noise, in a further technical scheme, the cross section of the first perforated panel is of a toothed waveform structure, the first perforated panel comprises a first surface and a second surface, the first surface and the second surface are crossed to form a sound absorption wedge, and the first surface and the second surface are both provided with first through holes; the cross section of the second perforated panel is of a tooth-shaped structure, the second perforated panel comprises a third surface and a fourth surface, the third surface and the fourth surface are crossed to form a sound absorption wedge, and second through holes are formed in the third surface and the fourth surface.
In order to further absorb sound and reduce noise, in a further technical scheme, an intersection angle of the first surface and the second surface is 90 degrees, an intersection angle of a first through hole positioned on the first surface and a center line of a first through hole positioned on the second surface is 90 degrees, an intersection angle of a third surface and a fourth surface is 90 degrees, an intersection angle of a second through hole positioned on the third surface and a center line of a second through hole positioned on the fourth surface is 90 degrees, and an intersection angle of center lines of two adjacent silencing tubes is 90 degrees.
In order to further absorb sound and reduce noise, in a further technical scheme, the cross sections of the first perforated panel and the second perforated panel are of rectangular waveform structures, sound absorption wedges are formed at corners of the rectangular waveform structures, first through holes are formed in both the wave crest surface and the wave trough surface of the first perforated panel, and second through holes are formed in both the wave crest surface and the wave trough surface of the second perforated panel; the central lines of two adjacent silencing tubes are parallel.
In order to further absorb sound and reduce noise, in a further technical scheme, the aperture of the silencing hole is smaller than 1mm, the wall thickness of the silencing barrel is 1-5 mm, and the length of the silencing barrel is larger than 100 mm.
In order to further absorb sound and reduce noise, in a further technical solution, the silencing pot is mounted obliquely relative to the first perforated panel and the second perforated panel.
In order to further absorb sound and reduce noise, in a further technical scheme, the first through hole is larger than the second through hole, and one end of an airflow channel of the silencing barrel is larger than the other end of the airflow channel to form a conical structure.
In order to further absorb sound and reduce noise, in a further technical scheme, the second perforated panel is a micro perforated panel, the second through holes are micro holes, the aperture of each second through hole is smaller than 1mm, and the thickness of the second perforated panel is 1-5 mm.
Compared with the prior art, the building engineering fence has the beneficial effects that:
1. first perforation panel and second are perforated and are connected through a hush pipe between the panel, and light and air current all can pass first perforation panel, hush pipe airflow channel, the perforation panel of second and get into the opposite side from building engineering encloses one side of keeping off, realize the effect of permeating light and preventing wind, reduce the wind pressure stress surface, prevent that building engineering from enclosing to keep off and collapsing.
2. The first perforated panel and the second perforated panel are connected through the silencing barrel, a resonant cavity is formed between the first perforated panel and the second perforated panel, the sound energy is cleaned and dissipated by the back-and-forth friction of the air column in the silencing hole, and the resonant frequency of the sound absorption peak is controlled by the depth of the resonant cavity. The plurality of silencing tubes are arranged in the resonant cavity, acoustic energy is cleaned through repeated back-and-forth friction, the silencing holes are small, acoustic resistance is increased, acoustic mass is reduced, acoustic absorption coefficient is improved, acoustic absorption frequency bandwidth is widened, and acoustic absorption and noise reduction effects are improved.
3. The acoustic wave is generally a longitudinal wave, and a wave in which the vibration direction of the medium particle coincides with the propagation direction of the wave is called a longitudinal wave. The silencing cylinder is obliquely installed, so that the propagation direction of the wave is inconsistent with the direction of the airflow channel of the silencing cylinder, the sound wave is prevented from being propagated along the direction of the airflow channel of the silencing cylinder, the sound energy clearing is increased, and the sound absorption and noise reduction effects are further improved.
4. In another aspect, the first and second perforated panels have a tooth-like wave structure or a rectangular wave structure in cross-section to form sound absorbing wedges. The absorption area is increased, the sound absorption coefficient of the sound absorption wedge is high and can reach 0.99, the sound absorption performance of the sound absorption wedge is related to the length of the sound absorption wedge and the depth of the resonant cavity, the longer the sound absorption wedge is, the larger the absorption area is, the deeper the resonant cavity is, and the better the sound absorption performance is. Further improve the sound absorption and noise reduction effect.
5. In another scheme, the second perforated panel is a micro perforated panel, the second through holes are micro holes, the aperture of each second through hole is smaller than 1mm, and the thickness of the second perforated panel is 1-5 mm. The aperture of the silencing hole is smaller than 1mm, the wall thickness of the silencing tube is 1-5 mm, and the length of the silencing tube is larger than 100 mm. One end of the airflow channel of the silencing barrel is larger than the other end of the airflow channel to form a conical structure. And a micro perforated panel sound absorption technology is adopted, so that the sound absorption and noise reduction effects are further improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic view of a constructional engineering fence structure of a first embodiment of the invention;
FIG. 2 is a schematic view of a first perforated panel structure of FIG. 1;
FIG. 3 is a schematic view of a second perforated panel of FIG. 1;
FIG. 4 is a schematic structural view of the silencing pot of FIG. 1;
FIG. 5 is a schematic view of a second embodiment of the present invention of a construction fence structure;
fig. 6 is a schematic view of a constructional engineering fence structure of a third embodiment of the invention;
fig. 7 is a schematic structural view of the silencing pot of fig. 6.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the present invention provides a building engineering enclosure according to a first preferred embodiment, which includes a first perforated panel 1 and a second perforated panel 2, a resonant cavity 5 is formed between the first perforated panel 1 and the second perforated panel 2, an air layer is provided in the resonant cavity 5, a silencing tube 3 is installed in the resonant cavity 5, a first through hole 10 (shown in fig. 2) is uniformly arranged on the first perforated panel 1, a second through hole 20 (shown in fig. 3) is uniformly arranged on the second perforated panel 2, two ends of the silencing tube 3 are respectively connected to the first through hole 10 and the second through hole 20, an air flow channel 31 is provided in the middle of the silencing tube 3, the air flow channel 31 communicates the first through hole 10 and the second through hole 20, a silencing hole 30 is provided on the outer wall around the silencing tube 3, the silencing hole 30 communicates with the air flow channel 31, and the aperture of the silencing hole 30 is smaller than the aperture of the air flow channel 31; the sound waves enter the resonance chamber 5 through the muffling holes 30 to be muffled. The silencing pot 3 is mounted obliquely with respect to the first and second perforated panels 1 and 2.
As shown in fig. 4, the silencing tube 3 is of a thin plate micropore structure, the aperture of the silencing hole 30 is smaller than 1mm, the wall thickness of the silencing tube 3 is 1-5 mm, and the length of the silencing tube 3 is larger than 100 mm. The cross section of the silencing barrel 3 is circular, and an 8-edge or other polygonal structure can also be adopted. In the constructional engineering fence according to the first embodiment of the present invention, the silencing pot 3 may be a conical silencing pot 4 as shown in fig. 7.
As shown in fig. 1, when the sound source propagates the sound wave from the O point in the direction of the arrow, the direction of the sound wave is not consistent with the direction of the airflow channel 31, so that the sound wave is prevented from propagating in the direction of the airflow channel 31 of the sound-deadening cylinder 3, the sound resistance is increased, the sound quality is reduced, the sound absorption coefficient is improved, and the sound absorption bandwidth is widened. In addition, the sound wave enters the resonant cavity 5 through the muffling holes 30 of the first muffling barrel 3, then enters the other resonant cavity 5 through the muffling holes 30 of the second muffling barrel 3, then is reflected through the muffling holes 30 of the third muffling barrel 3 and is reflected back to the sound source side. The sound waves are rubbed back and forth in the sound absorption holes 30 to clean sound energy, the sound absorption holes 30 are small, the sound resistance is increased, the sound quality is reduced, the sound absorption coefficient is improved, the width of a sound absorption frequency band is widened, and the sound absorption and noise reduction effects are improved.
In addition, as shown by arrows in fig. 1, light and air flow can pass through the second perforated panel 2 from one side of the second perforated panel 2 of the enclosure of the building engineering, the air flow channel 31 of the silencing tube 3 and the first perforated panel 1 to enter one side of a sound source, so that the light transmission and wind prevention effects are realized, the wind pressure stress surface is reduced, and the enclosure of the building engineering is prevented from collapsing.
As shown in fig. 5, in order to further improve the sound absorption and noise reduction effects, the invention provides a second preferred embodiment of a building engineering fence, which is different from the first embodiment in that:
the first perforated panel 1 has a cross section of a tooth-shaped wave structure, the first perforated panel 1 comprises a first surface 11 and a second surface 12, and the first surface 11 and the second surface 12 intersect to form an acoustic wedge 13. The first surface 11 and the second surface 12 are both provided with a first through hole 10; the cross section of the second perforated panel 2 is a tooth-shaped structure, the second perforated panel 2 comprises a third surface 21 and a fourth surface 22, the third surface 21 and the fourth surface 22 are intersected to form a sound absorption wedge 23, and the third surface 21 and the fourth surface 22 are both provided with second through holes 20.
The intersection angle between the first surface 11 and the second surface 12 is 90 degrees, the intersection angle between the first through hole 10 located on the first surface 11 and the center line of the first through hole 10 located on the second surface 12 is 90 degrees, the intersection angle between the third surface 21 and the fourth surface 22 is 90 degrees, the intersection angle between the second through hole 20 located on the third surface 21 and the center line of the second through hole 20 located on the fourth surface 22 is 90 degrees, and the intersection angle between the center lines of two adjacent silencing tubes 3 is 90 degrees. The intersecting angle of the central lines of two adjacent silencing tubes 3 is 90 degrees, so that sound waves with different incident angles can be absorbed, and the sound absorption and noise reduction effects are improved.
The second embodiment increases the absorption area of the first and second perforated panels 1, 2, the sound absorption coefficient of the sound absorption wedges 13, 23 is high, which can reach 0.99, the sound absorption performance of the sound absorption wedges 13, 23 is related to the length of the sound absorption wedges 13, 24 (i.e. the length from the peak point to the valley point) and the depth of the resonant cavity 5, and the longer the sound absorption wedge 13 is, the larger the absorption area is, the deeper the resonant cavity 5 is, the better the sound absorption performance is.
As shown in fig. 6, in order to further absorb sound and reduce noise, the present invention provides a construction work enclosure of a third preferred embodiment, which is different from the first embodiment in that:
the cross sections of the first perforated panel 1 and the second perforated panel 2 are of rectangular waveform structures, sound absorption wedges 16 are formed at the corners of the rectangular waveform structures, first through holes 10 are formed in a wave crest surface 14 and a wave trough surface 15 of the first perforated panel 1, and second through holes 20 are formed in a wave crest surface 25 and a wave trough surface 24 of the second perforated panel 2; the central lines of two adjacent silencing tubes 3 are parallel. The first through hole 10 is larger than the second through hole 20, and one end of the air flow passage 31 of the silencing pot 3 is larger than the other end to form a tapered structure (as shown in fig. 7). The second perforated panel 2 is a micro perforated panel, the second through holes 20 are micro holes, the aperture of the second through holes 20 is smaller than 1mm, and the thickness of the second perforated panel 2 is 1-5 mm. The second embodiment increases the absorption areas of the first and second perforated panels 1 and 2, and further improves the sound absorption and noise reduction effects.
The techniques not described above are common general knowledge of the skilled person. All numbers less than or greater than the stated ranges are inclusive. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A building engineering enclosure is characterized by comprising a first perforated panel and a second perforated panel, wherein a resonant cavity is formed between the first perforated panel and the second perforated panel, an air layer is arranged in the resonant cavity, a silencing tube is arranged in the resonant cavity, first through holes are uniformly arranged on the first perforated panel, second through holes are uniformly arranged on the second perforated panel, two ends of the silencing tube are respectively connected with the first through holes and the second through holes, an air flow channel is arranged in the middle of the silencing tube and is communicated with the first through holes and the second through holes, silencing holes are formed in the peripheral outer walls of the silencing tube and are communicated with the air flow channel, and the aperture of each silencing hole is smaller than that of the air flow channel; the sound waves pass through the silencing holes and enter the resonant cavity to reduce noise.
2. The constructional engineering fence as claimed in claim 1, wherein the first perforated panel has a cross section of a toothed waveform structure, the first perforated panel comprises a first surface and a second surface, the first surface and the second surface intersect to form a sound absorption wedge, and the first surface and the second surface are both provided with first through holes; the cross section of the second perforated panel is of a tooth-shaped structure, the second perforated panel comprises a third surface and a fourth surface, the third surface and the fourth surface are crossed to form a sound absorption wedge, and second through holes are formed in the third surface and the fourth surface.
3. The constructional engineering fence as recited in claim 2, wherein the intersection angle of the first surface and the second surface is 90 degrees, the intersection angle of the first through hole on the first surface and the center line of the first through hole on the second surface is 90 degrees, the intersection angle of the third surface and the fourth surface is 90 degrees, the intersection angle of the second through hole on the third surface and the center line of the second through hole on the fourth surface is 90 degrees, and the intersection angle of the center lines of two adjacent silencing tubes is 90 degrees.
4. The constructional engineering fence as recited in claim 1, wherein the first perforated panel and the second perforated panel have a rectangular waveform in cross section, a sound absorbing wedge is formed at a corner of the rectangular waveform, a first through hole is formed in each of a peak surface and a trough surface of the first perforated panel, and a second through hole is formed in each of a peak surface and a trough surface of the second perforated panel; the central lines of two adjacent silencing tubes are parallel.
5. The constructional engineering fence as claimed in any one of claims 1 to 4, wherein the aperture of the silencing hole is less than 1mm, the wall thickness of the silencing pot is 1-5 mm, and the length of the silencing pot is greater than 100 mm.
6. The construction work enclosure according to any one of claims 1 to 4, wherein the sound-damping cylinders are mounted obliquely with respect to the first and second perforated panels.
7. The constructional engineering fence of claim 6, wherein the first through hole is larger than the second through hole, and one end of the airflow channel of the silencing pot is larger than the other end thereof to form a conical structure.
8. The constructional engineering fence of claim 7, wherein the second perforated panel is a micro perforated panel, the second through holes are micro holes, the diameter of the second through holes is less than 1mm, and the thickness of the second perforated panel is 1-5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010816189.7A CN111946145A (en) | 2020-08-14 | 2020-08-14 | Building engineering encloses fender |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010816189.7A CN111946145A (en) | 2020-08-14 | 2020-08-14 | Building engineering encloses fender |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111946145A true CN111946145A (en) | 2020-11-17 |
Family
ID=73342164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010816189.7A Withdrawn CN111946145A (en) | 2020-08-14 | 2020-08-14 | Building engineering encloses fender |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111946145A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101609668A (en) * | 2008-06-18 | 2009-12-23 | 广州建声贸易有限公司 | The perforation refraction combined resonant sound absorption structure |
| KR20110103792A (en) * | 2010-03-15 | 2011-09-21 | 주식회사 에코프랜 | Soundproof wall with sagging function |
| CN104464710A (en) * | 2014-11-21 | 2015-03-25 | 南京航空航天大学 | Acoustic sandwich panel |
| CN206346126U (en) * | 2016-10-08 | 2017-07-21 | 森特士兴集团股份有限公司 | A kind of combined type wedge sound barrier panel and its sound barrier |
| CN208501531U (en) * | 2018-07-06 | 2019-02-15 | 四川国统混凝土制品有限公司 | A kind of sound absorption off-load sound barrier unit and its sound barrier |
| CN209323402U (en) * | 2018-10-16 | 2019-08-30 | 成都友益佳环保设备工程有限公司 | A kind of noise protection device |
| CN210421475U (en) * | 2019-08-03 | 2020-04-28 | 江苏华之杰环境科技有限公司 | Module assembling type double-sided sound barrier for workshop |
| CN211228186U (en) * | 2019-09-30 | 2020-08-11 | 成都市市政工程设计研究院 | Town road sound absorbing structure |
| CN212336914U (en) * | 2020-08-14 | 2021-01-12 | 王术平 | Building engineering encloses fender |
-
2020
- 2020-08-14 CN CN202010816189.7A patent/CN111946145A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101609668A (en) * | 2008-06-18 | 2009-12-23 | 广州建声贸易有限公司 | The perforation refraction combined resonant sound absorption structure |
| KR20110103792A (en) * | 2010-03-15 | 2011-09-21 | 주식회사 에코프랜 | Soundproof wall with sagging function |
| CN104464710A (en) * | 2014-11-21 | 2015-03-25 | 南京航空航天大学 | Acoustic sandwich panel |
| CN206346126U (en) * | 2016-10-08 | 2017-07-21 | 森特士兴集团股份有限公司 | A kind of combined type wedge sound barrier panel and its sound barrier |
| CN208501531U (en) * | 2018-07-06 | 2019-02-15 | 四川国统混凝土制品有限公司 | A kind of sound absorption off-load sound barrier unit and its sound barrier |
| CN209323402U (en) * | 2018-10-16 | 2019-08-30 | 成都友益佳环保设备工程有限公司 | A kind of noise protection device |
| CN210421475U (en) * | 2019-08-03 | 2020-04-28 | 江苏华之杰环境科技有限公司 | Module assembling type double-sided sound barrier for workshop |
| CN211228186U (en) * | 2019-09-30 | 2020-08-11 | 成都市市政工程设计研究院 | Town road sound absorbing structure |
| CN212336914U (en) * | 2020-08-14 | 2021-01-12 | 王术平 | Building engineering encloses fender |
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| PB01 | Publication | ||
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Application publication date: 20201117 |