CN113174878A - Noise reduction equipment for road construction and installation method thereof - Google Patents
Noise reduction equipment for road construction and installation method thereof Download PDFInfo
- Publication number
- CN113174878A CN113174878A CN202110451506.4A CN202110451506A CN113174878A CN 113174878 A CN113174878 A CN 113174878A CN 202110451506 A CN202110451506 A CN 202110451506A CN 113174878 A CN113174878 A CN 113174878A
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- noise reduction
- movable
- block
- frame
- silencing
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
- E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
- E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
- E01F8/0023—Details, e.g. foundations
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Road Paving Structures (AREA)
- Tires In General (AREA)
Abstract
The invention discloses noise reduction equipment for road construction and an installation method thereof, relates to the field of road construction, and aims at solving the problems that the existing road noise reduction equipment is simple in structure, difficult to install and free of an anti-collision protection function. The invention not only can obviously improve the stability of the noise reduction equipment for road construction, but also changes the traditional integrated fastening bolt mounting structure, so that the road noise reduction equipment is more convenient to assemble and disassemble, and the road construction period is favorably shortened.
Description
Technical Field
The invention relates to the field of road construction, in particular to noise reduction equipment for road construction and an installation method thereof.
Background
Road engineering construction refers to the process of converting certain building materials into fixed assets through construction and installation activities. Fixed assets are material data which can be used for a long time and keep the original material form unchanged in the using process, such as roads, bridges, plants, machinery, equipment, transportation tools and the like.
When carrying out road construction, when the road passes through the residential area, in order to provide comparatively quiet residential environment, need to fall the noise equipment of making an uproar at its road periphery installation and be used for isolated road on the noise that the car produced, improve quality of life, and the most structure of the equipment of making an uproar is comparatively simple on current road, but the installation is comparatively difficult, will fall the board of making an uproar and install fixedly through the cooperation of support and bolt, undoubtedly bring comparatively big influence for road construction's time limit, consequently, in order to solve this type of problem, we have proposed a equipment of making an uproar and mounting method of making an uproar for road construction.
Disclosure of Invention
The invention provides noise reduction equipment for road construction and an installation method thereof, and solves the problems that the existing road noise reduction equipment is simple in structure, difficult to install and does not have an anti-collision protection function.
In order to achieve the purpose, the invention adopts the following technical scheme:
the noise reduction equipment for road construction comprises a base, supports and a silencing mechanism, wherein the supports which are vertically arranged are fixedly connected to two sides of the top end of the base, and the silencing mechanism is arranged between the two supports;
amortization mechanism includes the amortization frame, just the amortization frame is opening form setting towards road one side, and matches with the opening and install spacing apron, first amortization layer, second amortization layer and third amortization layer are installed to inside one side of amortization frame, just the dismouting structure is installed in the cooperation between amortization frame and the spacing apron.
Preferably, the material filled in the first sound-absorbing layer is foam plastic, the material filled in the second sound-absorbing layer is wave-crest sound-absorbing cotton, and the material filled in the third sound-absorbing layer is rubber and mineral.
As preferred, the dismouting structure includes fixed block, loose ring, guide bar, lug, fixed plate, reset spring and movable block, the equal fixedly connected with fixed block in four turnings in one side that spacing apron is close to amortization frame inner chamber, just one side fixedly connected with guide bar of spacing apron is kept away from to the fixed block, the tip fixedly connected with lug of guide bar, just sliding sleeve is equipped with the loose ring on the body of rod of guide bar, fixedly connected with four fixed plates that match each other with fixed block, loose ring, guide bar and lug between the both sides inner wall of amortization frame, just the movable groove has been seted up towards one side that amortization frame horizontal center put to the fixed plate, sliding fit has the movable block in the movable groove, just fixedly connected with reset spring between the inner wall of the one end that the movable groove is located the movable groove inside and movable groove.
As preferred, two adjacent sides that the movable block is close to fixed block, activity ring, guide bar and lug are provided with the breach, the lug is provided with the radius angle, the activity ring includes two round platforms that are symmetric distribution, and is the setting of integral type structure, the movable block is greater than the distance between activity ring vertical center face and the lug biggest disc along amortization frame thickness direction and the one side length that is close to breach department.
Preferably, the top of base has seted up the mounting groove along its length direction, just movable mounting has the planting case in the mounting groove, the top of planting the case is provided with the opening, just the equal fixedly connected with of upper segment of planting the case along its length direction's both sides inner wall places the board, and two place the top movable mounting of board and plant the board, evenly set up on the plate body of planting the board and plant the hole.
Preferably, the two brackets are fixedly connected with symmetrically distributed side guard plates, and the side guard plates are arranged in a U shape.
Preferably, the side guard plate is evenly provided with a groove body along the length direction of the side guard plate, and a buffer tire is arranged in the groove body.
A method of installing a noise reducing apparatus for road construction, comprising the steps of:
s1, firstly, digging a rectangular groove at the periphery of a road to be provided with the noise reduction equipment, wherein the rectangular groove is matched with the size of a base of the noise reduction equipment, and then placing the whole noise reduction equipment in the rectangular groove;
s2, placing the planting box inside the mounting groove, filling culture soil inside the planting box, and planting plants through the planting plate;
s3, sequentially installing the first silencing layer, the second silencing layer and the third silencing layer in the silencing frame;
s4, pushing the limiting cover plate to the interior of the silencing frame, enabling the fixed blocks at four corners of the limiting cover plate to be aligned with the fixed plate, enabling the convex blocks to be in contact with the notches at the movable blocks, pushing the movable blocks to slide in the movable grooves, and extruding the return springs;
and S5, finally, fixing the side guard plates on the two sides of the bracket to complete the installation of the noise reduction equipment.
The invention has the beneficial effects that:
1. set up the great base of contact surface through the bottom at this noise cancelling mechanism, can this noise cancelling mechanism's of effectual improvement overall stability to be used for stably placing through setting up the mounting groove in the top of base and plant the case, can provide the planting technique area, improve road greening condition, improve this noise cancelling mechanism's stability once more through the gravity of plant and planting soil simultaneously.
2. Through all setting up crashproof buffer gear between the both sides at the support, not only can provide effectual anticollision protection to this noise reduction mechanism, can carry out certain buffer protection to the collision object simultaneously, reduce loss of property, improve the security performance.
3. Through the mounting and dismounting structure which is arranged on the silencing frame of the silencing mechanism and is matched with the limiting cover plate, the silencing layer inside the silencing frame can be mounted and dismounted conveniently, the traditional integrated fastening bolt mounting structure is changed, the mounting method of the road silencing and noise reducing equipment is more convenient, the mounting efficiency of the road noise reducing equipment is improved, and the road construction period is shortened.
In conclusion, the device not only can make the noise reduction equipment stability for road construction obtain showing and improving, has changed traditional integral type fastening bolt mounting structure simultaneously for the dismouting of road noise reduction equipment is more convenient, helps shortening road construction time limit for a project, improves economic benefits.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic illustration of an explosive structure according to the present invention;
FIG. 3 is an enlarged view of A in FIG. 2 according to the present invention;
FIG. 4 is an internal cross-sectional view of the sound attenuating frame of the present invention;
fig. 5 is an enlarged structural diagram of B in fig. 4 according to the present invention.
Reference numbers in the figures: the device comprises a base 1, a support 2, a silencing frame 3, a side guard plate 4, a buffer tire 5, a limiting cover plate 6, a mounting groove 7, a planting box 8, a placing plate 9, a planting plate 10, a first silencing layer 11, a second silencing layer 12, a third silencing layer 13, a fixed block 14, a movable ring 15, a guide rod 16, a convex block 17, a fixed plate 18, a return spring 19, a movable groove 20 and a movable block 21.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Examples
Referring to fig. 1 and 2, an equipment of making an uproar falls for road construction, including base 1, support 2 and canceling sound mechanical system, the equal fixedly connected with in top both sides of base 1 is the support 2 of vertical setting, mounting groove 7 has been seted up along its length direction in base 1's top, and movable mounting has planting case 8 in mounting groove 7, the top of planting case 8 is provided with the opening, and the equal fixedly connected with in upper segment of planting case 8 along its length direction's both sides inner wall places board 9, and two top movable mounting who places board 9 have planting board 10, evenly set up planting hole on planting board 10's the plate body.
Through the setting of base 1 for this equipment of making an uproar and the area of contact increase on ground of should making an uproar, guarantee the holistic stability of this equipment of making an uproar, and set up mounting groove 7 on base 1, install in mounting groove 7 and plant case 8 and be used for planting the plant, not only can improve road greening environment, can increase the stability of this equipment of making an uproar again through the gravity of planting plant and planting case 8 and culture soil simultaneously.
Fixedly connected with is the side guard plate 4 of symmetric distribution between two supports 2, and side guard plate 4 is the setting of U type, and the cell body has evenly been seted up along its length direction to side guard plate 4, and installs buffering tire 5 in the cell body, through the buffering tire 5 of installation on side guard plate 4 and the side guard plate 4, can provide effectual buffering collision avoidance to this equipment of making an uproar that falls, also can carry out certain protection to road vehicle simultaneously.
Referring to fig. 1 and 2, install amortization mechanism between two supports 2, amortization mechanism includes amortization frame 3, and amortization frame 3 is the opening form setting towards road one side, and match with the opening and install spacing apron 6, first amortization layer 11 is installed to the inside one side of amortization frame 3, second amortization layer 12 and third amortization layer 13, the material of the inside packing of first amortization layer 11 is foamed plastic, the material of the inside packing of second amortization layer 12 is the crest sound absorption cotton, the material of the inside packing of third amortization layer 13 is rubber and mineral substance.
Referring to fig. 2-5, a disassembly and assembly structure is installed between the silencing frame 3 and the limiting cover plate 6 in a matching manner, the disassembly and assembly structure comprises a fixed block 14, a movable ring 15, a guide rod 16, a convex block 17, a fixed plate 18, a return spring 19 and a movable block 21, the four corners of one side of the limiting cover plate 6 close to the inner cavity of the silencing frame 3 are fixedly connected with the fixed block 14, one side of the fixed block 14 far away from the limiting cover plate 6 is fixedly connected with the guide rod 16, the end part of the guide rod 16 is fixedly connected with the convex block 17, the movable ring 15 is sleeved on the rod body of the guide rod 16 in a sliding manner, four fixed plates 18 matched with the fixed block 14, the movable ring 15, the guide rod 16 and the convex block 17 are fixedly connected between the inner walls of two sides of the silencing frame 3, a movable groove 20 is formed in one side of the fixed plate 18 facing the horizontal center of the silencing frame 3, the movable block 21 is slidably installed in the movable groove 20, and a return spring 21 is fixedly connected between one end of the movable block 21 and the inner wall of the movable groove 20 A spring 19.
Two adjacent sides that the movable block 21 is close to fixed block 14, activity ring 15, guide bar 16 and lug 17 are provided with the breach, and lug 17 is provided with the radius angle, and activity ring 15 includes two round platforms that are the symmetric distribution, and is the setting of integral type structure, and one side length that the movable block 21 just is close to breach department along 3 thickness directions of amortization frame is greater than the distance between the biggest disc of activity ring 15 vertical center face and lug 17.
A method of installing a noise reducing apparatus for road construction, comprising the steps of:
firstly, digging a rectangular groove at the periphery of a road to be provided with the noise reduction equipment, wherein the rectangular groove is matched with the size of a base 1 of the noise reduction equipment, then placing the noise reduction equipment into the rectangular groove as a whole, then placing a planting box 8 into the mounting groove 7, filling and placing culture soil into the planting box 8, planting plants through a planting plate 10, then sequentially mounting a first silencing layer 11, a second silencing layer 12 and a third silencing layer 13 into a silencing frame 3, pushing a limiting cover plate 6 into the silencing frame 3, aligning fixed blocks 14 at four corners of the limiting cover plate 6 to a fixed plate 18, enabling a lug 17 to be in contact with a notch at the movable block 21, pushing the movable block 21 to slide in a movable groove 20 and extruding a return spring 19, and when the lug 17 completely passes over the movable block 21, pushing the movable block 21 to be positioned between the movable ring 15 and the lug 17 by the return spring 19, block through movable block 21 and lug 17, can make spacing apron 6 and amortization frame 3 installation stable from this, at last with the side guard plate 4 installation of support 2 both sides fixed can accomplish the installation of this equipment of making an uproar that falls.
When the silencing layer in the silencing frame 3 needs to be replaced, the limiting cover plate 6 is pushed inwards again, so that the limiting cover plate 6 pushes the fixed block 14, the fixed block 14 pushes the guide rod 16 and the bump 17, the gap of the movable block 21 contacts with the circumferential surface of the movable ring 15, when the movable ring 15 abuts against the fixed block 14, the limiting cover plate 6 is continuously pushed, at the same time, the movable ring 15 pushes the movable block 21, so that the movable block 21 slides in the movable groove 20 again, the return spring 19 is extruded at the same time, when the movable block 21 moves to a position between the movable ring 15 and the fixed block 14, the limiting cover plate 6 is pulled outwards, at the same time, the movable block 21 pushes the movable ring 15 to reversely slide on the rod body of the guide rod 16 until the movable block abuts against the bump 17, then the limiting cover plate 6 is pulled, at the same time, the movable block 21 contacts with the movable ring 15 along the thickness direction of the silencing frame 3 and the corresponding corner of the gap, so can make the movable block 21 slide in activity groove 20 again to extrusion reset spring 19, because the movable block 21 is greater than the distance between the perpendicular central plane of activity ring 15 and the biggest disc of lug 17 along the 3 thickness direction of amortization frame and the one side length that is close to breach department, so movable block 21 can support between activity ring 15 and lug 17, then continue to stimulate spacing apron 6 and can dismantle it, then change can to the amortization layer of amortization frame 3 inside.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The noise reduction equipment for road construction comprises a base (1), supports (2) and a silencing mechanism, and is characterized in that the two sides of the top end of the base (1) are fixedly connected with the supports (2) which are vertically arranged, and the silencing mechanism is arranged between the two supports (2);
amortization mechanism includes amortization frame (3), just amortization frame (3) are the opening form setting towards road one side, and matches with the opening and install spacing apron (6), first amortization layer (11), second amortization layer (12) and third amortization layer (13) are installed to inside one side of amortization frame (3), just the dismouting structure is installed in the cooperation between amortization frame (3) and spacing apron (6).
2. The noise reduction apparatus for road construction according to claim 1, wherein the material filled inside the first sound-deadening layer (11) is foam plastic, the material filled inside the second sound-deadening layer (12) is wave-crest sound-absorbing cotton, and the material filled inside the third sound-deadening layer (13) is rubber and mineral.
3. The noise reduction device for road construction according to claim 1, wherein the disassembly and assembly structure comprises a fixed block (14), a movable ring (15), a guide rod (16), a convex block (17), a fixed plate (18), a return spring (19) and a movable block (21), the fixed block (14) is fixedly connected to four corners of one side of the limiting cover plate (6) close to the inner cavity of the noise reduction frame (3), the guide rod (16) is fixedly connected to one side of the fixed block (14) far away from the limiting cover plate (6), the convex block (17) is fixedly connected to the end of the guide rod (16), the movable ring (15) is slidably sleeved on the rod body of the guide rod (16), and the four fixed plates (18) mutually matched with the fixed block (14), the movable ring (15), the guide rod (16) and the convex block (17) are fixedly connected between the inner walls of two sides of the noise reduction frame (3), and a movable groove (20) is formed in one side, facing the horizontal center of the silencing frame (3), of the fixing plate (18), a movable block (21) is arranged in the movable groove (20) in a sliding mode, and a reset spring (19) is fixedly connected between one end, located inside the movable groove (21), of the movable block (21) and the inner wall of the movable groove (20).
4. The noise reduction device for road construction according to claim 3, wherein two adjacent sides of the movable block (21) close to the fixed block (14), the movable ring (15), the guide rod (16) and the convex block (17) are provided with notches, the convex block (17) is provided with a fillet, the movable ring (15) comprises two circular truncated cones which are symmetrically distributed and are arranged in an integrated structure, and the length of one side of the movable block (21) close to the notch along the thickness direction of the silencing frame (3) is greater than the distance between the vertical center plane of the movable ring (15) and the maximum circular plane of the convex block (17).
5. The noise reduction device for road construction according to claim 1, wherein the top end of the base (1) is provided with a mounting groove (7) along the length direction thereof, a planting box (8) is movably mounted in the mounting groove (7), the top end of the planting box (8) is provided with an opening, the upper sections of the inner walls of the two sides of the planting box (8) along the length direction thereof are fixedly connected with placing plates (9), the top ends of the two placing plates (9) are movably mounted with planting plates (10), and planting holes are uniformly formed in the plate bodies of the planting plates (10).
6. The noise reduction device for road construction according to claim 1, characterized in that symmetrically distributed side guard plates (4) are fixedly connected between the two brackets (2), and the side guard plates (4) are arranged in a U shape.
7. The noise reduction device for road construction according to claim 6, wherein the side guard plate (4) is uniformly provided with a groove body along the length direction, and the groove body is internally provided with a buffer tire (5).
8. A method of installing a noise reducing apparatus for road construction, comprising the steps of:
s1, firstly, digging a rectangular groove at the periphery of a road to be provided with the noise reduction equipment, wherein the rectangular groove is matched with the base (1) of the noise reduction equipment in size, and then placing the whole noise reduction equipment in the rectangular groove;
s2, placing the planting box (8) inside the mounting groove (7), filling culture soil inside the planting box (8), and planting plants through the planting plate (10);
s3, sequentially installing the first silencing layer (11), the second silencing layer (12) and the third silencing layer (13) inside the silencing frame (3);
s4, the limiting cover plate (6) is pushed towards the inside of the silencing frame (3), the fixing blocks (14) at four corners of the limiting cover plate (6) are aligned to the fixing plate (18), the convex block (17) is in contact with the notch of the movable block (21), the movable block (21) is pushed to slide in the movable groove (20), the return spring (19) is extruded, when the convex block (17) completely crosses the movable block (21), the return spring (19) pushes the movable block (21) to be located between the movable ring (15) and the convex block (17), and the movable block (21) and the convex block (17) are used for blocking, so that the limiting cover plate (6) and the silencing frame (3) can be stably installed;
s5, finally, the side guard plates (4) on the two sides of the bracket (2) are installed and fixed, and then the noise reduction equipment can be installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110451506.4A CN113174878B (en) | 2021-04-26 | 2021-04-26 | Noise reduction equipment for road construction and installation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110451506.4A CN113174878B (en) | 2021-04-26 | 2021-04-26 | Noise reduction equipment for road construction and installation method thereof |
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| Publication Number | Publication Date |
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| CN113174878A true CN113174878A (en) | 2021-07-27 |
| CN113174878B CN113174878B (en) | 2022-10-28 |
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| CN202110451506.4A Active CN113174878B (en) | 2021-04-26 | 2021-04-26 | Noise reduction equipment for road construction and installation method thereof |
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| CN (1) | CN113174878B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113958160A (en) * | 2021-09-18 | 2022-01-21 | 上海临玥科技有限公司 | Assembly type machine room for communication base station and construction method thereof |
| CN114961424A (en) * | 2022-06-15 | 2022-08-30 | 盐城市天辰建筑安装有限公司 | Combined support with noise reduction function for building construction platform and construction platform |
| CN115012331A (en) * | 2022-06-24 | 2022-09-06 | 江西玖亚新建筑工程有限公司 | A road and bridge sound reduction device for municipal bridge engineering |
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| JP2004250975A (en) * | 2003-02-20 | 2004-09-09 | Nippon Steel Metal Prod Co Ltd | Sound insulating wall structure for road |
| CN102595839A (en) * | 2011-01-11 | 2012-07-18 | 和硕联合科技股份有限公司 | Pop-up module and electronic device applying same |
| CN203625794U (en) * | 2013-12-18 | 2014-06-04 | 郭志华 | Highway sound barrier sound absorption board |
| CN206736796U (en) * | 2017-05-28 | 2017-12-12 | 陈鹏 | A kind of environmentally friendly sound insulation highway isolated column |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6315544B1 (en) * | 1999-10-07 | 2001-11-13 | Burger Engineering, Inc. | Adjustable length extension bars for connecting a mold ejector plate to a press ejector plate |
| JP2004250975A (en) * | 2003-02-20 | 2004-09-09 | Nippon Steel Metal Prod Co Ltd | Sound insulating wall structure for road |
| CN102595839A (en) * | 2011-01-11 | 2012-07-18 | 和硕联合科技股份有限公司 | Pop-up module and electronic device applying same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113958160A (en) * | 2021-09-18 | 2022-01-21 | 上海临玥科技有限公司 | Assembly type machine room for communication base station and construction method thereof |
| CN114961424A (en) * | 2022-06-15 | 2022-08-30 | 盐城市天辰建筑安装有限公司 | Combined support with noise reduction function for building construction platform and construction platform |
| CN114961424B (en) * | 2022-06-15 | 2023-10-20 | 盐城市天辰建筑安装有限公司 | Combined support with noise reduction function for building construction platform and construction platform |
| CN115012331A (en) * | 2022-06-24 | 2022-09-06 | 江西玖亚新建筑工程有限公司 | A road and bridge sound reduction device for municipal bridge engineering |
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|---|---|
| CN113174878B (en) | 2022-10-28 |
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