CN110230256A - Expansion gap device - Google Patents
Expansion gap device Download PDFInfo
- Publication number
- CN110230256A CN110230256A CN201910023083.9A CN201910023083A CN110230256A CN 110230256 A CN110230256 A CN 110230256A CN 201910023083 A CN201910023083 A CN 201910023083A CN 110230256 A CN110230256 A CN 110230256A
- Authority
- CN
- China
- Prior art keywords
- pontic
- interconnecting piece
- filling member
- support plate
- gap device
- 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.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 230000000903 blocking effect Effects 0.000 claims abstract description 21
- 238000007789 sealing Methods 0.000 claims description 14
- 239000000945 filler Substances 0.000 claims description 13
- 239000003292 glue Substances 0.000 claims description 12
- 239000004570 mortar (masonry) Substances 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/06—Arrangement, construction or bridging of expansion joints
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/08—Damp-proof or other insulating layers; Drainage arrangements or devices ; Bridge deck surfacings
- E01D19/083—Waterproofing of bridge decks; Other insulations for bridges, e.g. thermal ; Bridge deck surfacings
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The present invention relates to the technical fields of bridge, provide a kind of expansion gap device suitable for overpass, including left pontic, right pontic and water blocking tape；There are expansion joint between left pontic and right pontic, water blocking tape includes the left interconnecting piece for being sealingly attached on left pontic and the right interconnecting piece for being sealingly attached on right pontic, and the middle part connecting respectively with left interconnecting piece and right interconnecting piece；Middle part is bent downwardly to form the recessed portion for being filled in expansion joint.The left interconnecting piece of water blocking tape is sealingly attached on left pontic, and the right interconnecting piece of water blocking tape is sealingly attached on right pontic, and the recessed portion being filled in expansion joint can prevent moisture content from passing through recessed portion and penetrate into expansion joint；And when mutual telescopic displacement occurs between left pontic and right pontic, recessed portion can play effective buffer function.
Description
Technical field
The invention belongs to bridge technology fields, are to be related to a kind of expansion gap device more specifically.
Background technique
Overpass expansion joint is generally located on girder both ends and works seam crossing or ladder access beam and girder junction,
Device usually is stitched only with Simple telescopic because stroke is small, such as U-shaped zinc-iron skin expansion gap device, or only progress joint filling processing, is stretched
Contracting seam device does not form effective connection with beam body, falls off, stretches through often there is expansion gap device after overline bridge operation a period of time
Deck paving falls off and phenomena such as seriously infiltration blocks at expansion joint at seam, it is ugly not only to cause bridge appearance, or even will affect
To bridge using safe.With the promotion required urban public construction landscape, the minute design system of overpass
It is improved day by day, to solve the problems, such as overpass expansion joint it is easy to damage, it is difficult replacement, landscape difference it is imperative.
Summary of the invention
The purpose of the present invention is to provide a kind of expansion gap devices, durable to solve overline bridge expansion gap device in the prior art
Property poor, difficult replacement, the easily technical problems such as infiltration.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of expansion gap device is provided, including left pontic,
Right pontic and water blocking tape；There are expansion joint between the left pontic and the right pontic, the water blocking tape includes hermetically connecting
Connect on the left pontic left interconnecting piece and the right interconnecting piece that is sealingly attached on the right pontic, and respectively with it is described
The middle part that left interconnecting piece is connected with the right interconnecting piece；The middle part, which is bent downwardly to form, to be filled in the expansion joint
Recessed portion.
Further, sealing filler is filled in the recessed portion.
Further, water bubble plate until the sealing filler.
Further, the water blocking tape is integral piece made of rubber.
Further, the left pontic includes left stretcher body and left waterproof filling member, and the right pontic includes right stretcher body and the right side
Waterproof filling member, the left waterproof filling member are arranged on the left stretcher body, and the right waterproof filling member is arranged in the right shelf
On body；The left interconnecting piece is sealingly attached on the left waterproof filling member, and the right interconnecting piece is sealingly attached to described
On right waterproof filling member.
Further, the left waterproof filling member and right waterproof filling member integral piece made of mortar pours.
Further, foamed glue, the right interconnecting piece are filled between the left interconnecting piece and the left waterproof filling member
Foamed glue is filled between the right waterproof filling member.
Further, it is provided with left support plate on the left interconnecting piece upper surface, is arranged on the right interconnecting piece upper surface
Have a right support plate, the right support plate is covered on the top at the expansion joint, and one end of the right support plate be supported on it is described
It, being capable of opposite sliding between left support plate and the right support plate in left support plate.
Further, the left pontic further includes left pave-load layer, and the right pontic further includes right pave-load layer；Mat formation on the left side
Layer for being laid on the left stretcher body adjacent with the left waterproof filling member, the right pave-load layer for be laid on it is described
On the adjacent right stretcher body of right waterproof filling member；The upper surface of the left pave-load layer, the right pave-load layer upper surface, described
The upper surface of left support plate and the upper surface of the right interconnecting piece are located in same plane.
Further, non-slip texture is provided on the top surface of the right support plate.
The beneficial effect of bridge provided by the invention is: compared with prior art, expansion gap device provided by the invention,
The left interconnecting piece of water blocking tape is sealingly attached on left pontic, and the water on left pontic will not seep between left interconnecting piece and left pontic
Thoroughly into expansion joint；The right interconnecting piece of water blocking tape is sealingly attached on right pontic, and the water on right pontic will not be from right interconnecting piece
It is penetrated into expansion joint between right pontic；The recessed portion being filled in expansion joint can prevent moisture content from passing through recessed portion and permeate
Into expansion joint；And when mutual telescopic displacement occurs between left pontic and right pontic, the middle part of water blocking tape is formed by recess
Portion can play effective buffer function.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the diagrammatic cross-section of expansion gap device provided in an embodiment of the present invention；
Fig. 2 is the schematic top plan view of left support plate provided in an embodiment of the present invention；
Fig. 3 is the schematic top plan view of right support plate provided in an embodiment of the present invention.
Wherein, each appended drawing reference in figure:
11- left stretcher body；12- right stretcher body；The expansion joint 13-；2- water blocking tape；The left interconnecting piece of 21-；The right interconnecting piece of 22-；In 23-
Between portion；24- recessed portion；31- sealing filler；32- foamed glue；The left waterproof filling member of 41-；The right waterproof filling member of 42-；51- is left
Support plate；52- right support plate；The left pave-load layer of 61-；The right pave-load layer of 62-；7- bolt；The left pontic of 81-；The right pontic of 82-.
Specific embodiment
In order to which technical problems, technical solutions and advantages to be solved are more clearly understood, tie below
Accompanying drawings and embodiments are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is not intended to limit the present invention.
It should be noted that it can be directly another when element is referred to as " being fixed on " or " being set to " another element
On one element or indirectly on another element.When an element is known as " being connected to " another element, it can
To be directly to another element or be indirectly connected on another element.
It is to be appreciated that term " length ", " width ", "upper", "lower", "front", "rear", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "top", "bottom", "inner", "outside" is that orientation based on the figure or position are closed
System, is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must have
Specific orientation is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
Also referring to Fig. 1, now expansion gap device provided by the invention is illustrated.Including left pontic 81, right pontic
82 and water blocking tape 2；Expansion joint 13 is formed between left pontic 81 and right pontic 82；Water blocking tape 2 includes being sealingly attached to left bridge
Left interconnecting piece 21 on body 81 and the right interconnecting piece 22 being sealingly attached on right pontic 82, and respectively with left interconnecting piece 21 and
The middle part 23 that right interconnecting piece 22 connects；Middle part 23 is bent downwardly to form the recessed portion 24 being filled in expansion joint 13.
In this way, the left interconnecting piece 21 of water blocking tape 2 is sealingly attached on left pontic 81, the water on Zuo Qiaoti 81 will not be from a left side
It is penetrated between interconnecting piece 21 and left pontic 81 in expansion joint 13；The right interconnecting piece 22 of water blocking tape 2 is sealingly attached to right pontic
On 82, the water on right pontic 82 will not penetrate into expansion joint 13 between right interconnecting piece 22 and right pontic 82；It is filled in flexible
Recessed portion 24 in seam 13 can prevent moisture content from passing through recessed portion 24 and penetrate into expansion joint 13；And work as the spacing at expansion joint 13
When changing, the middle part 23 of water blocking tape 2, which is formed by recessed portion 24, can play effective buffer function.
Further, referring to Fig. 1, a kind of specific embodiment as expansion gap device provided by the invention, recess
Sealing filler 31 is filled in portion 24.In this way, sealing filler 31 is filled in recessed portion 24,24 energy of recessed portion being filled
It is enough that water is more easily prevented down along the infiltration of expansion joint 13.In addition, sealing filler 31 can also reduce moisture in recessed portion
Accumulation in 24.
Further, referring to Fig. 1, a kind of specific embodiment as expansion gap device provided by the invention, sealing
Water bubble plate until filler 31.In this way, sealing cystosepiment has good elasticity and good sealing performance.
Further, referring to Fig. 1, a kind of specific embodiment as expansion gap device provided by the invention, waterproof
Band 2 is integral piece made of rubber.In this way, rubber is easy molding, waterproof performance is good.
Further, it please refers to Fig.1 to Fig.3, as a kind of specific embodiment of expansion gap device provided by the invention,
Left pontic 81 includes left stretcher body 11 and left waterproof filling member 41, and right pontic 82 includes right stretcher body 12 and right waterproof filling member 42, a left side
Waterproof filling member 41 is arranged on left stretcher body 11, and right waterproof filling member 42 is arranged on right stretcher body 12；Left interconnecting piece 21 is hermetically
It is connected on left waterproof filling member 41, right interconnecting piece 22 is sealingly attached on right waterproof filling member 42.In this way, left interconnecting piece 21
It is connected on left stretcher body 11 by left waterproof filling member 41, so that left interconnecting piece 21 does not interfere with left frame in the process of disassembly
Body 11；Right interconnecting piece 22 is connected on right stretcher body 12 by right waterproof filling member 42, so that process of the right interconnecting piece 22 in disassembly
In do not interfere with right stretcher body 12.
Further, referring to Fig. 1, a kind of specific embodiment as expansion gap device provided by the invention, Zuo Fang
Water filling member 41 and the right integral piece made of mortar pours of waterproof filling member 42.In this way, pouring the left side to be formed using mortar
Waterproof filling member 41 is convenient for waiting fasteners to be attached with bolt 7, facilitates shape between left waterproof filling member 41 and left interconnecting piece 21
At stable connection, the right waterproof filling member 42 to be formed is poured using mortar and is convenient for waiting fasteners to be attached with bolt 7, it is convenient
Stable connection is formed between right waterproof filling member 42 and right interconnecting piece 22.
Further, referring to Fig. 1, a kind of specific embodiment as expansion gap device provided by the invention, Zuo Lian
It is filled with foamed glue 32 between socket part 21 and left waterproof filling member 41, is filled between right interconnecting piece 22 and right waterproof filling member 42
Foamed glue 32.In this way, foamed glue 32 has the function of waterproof, light, soft, flexible, mitigation impact.
Further, it please refers to Fig.1 to Fig.3, as a kind of specific embodiment of expansion gap device provided by the invention,
It is provided with left support plate 51 on left 21 upper surface of interconnecting piece, is provided with right support plate 52, right support on right 22 upper surface of interconnecting piece
Plate 52 is covered on 13 top of expansion joint, and one end of right support plate 52 is supported in left support plate 51, left support plate 51 and right branch
It being capable of opposite sliding between fagging 52.When the spacing at expansion joint 13 changes, left support plate 51 and right support plate 52 can be with
Opposite sliding.Right support plate 52 is covered on 24 top of recessed portion, if to replace the filler in recessed portion 24, it is only necessary to will
Right support plate 52 disassembles.
Optionally, in one embodiment, left support plate 51 is aluminium sheet；Further, in one embodiment, left support
The size of plate 51 are as follows: a length of 5mm × 82mm × 500mm.
Optionally, in one embodiment, the top surface of right support plate 52 has non-slip texture；Specifically, implement at one
In example, right support plate 52 is aluminium sheet；More specifically, in one embodiment, the size of right support plate 52 are as follows: a length of 5mm ×
200mm×500mm。
Optionally, in one embodiment, left support plate 51 is fixed on left waterproof filling member 41 by bolt 7, right branch
Fagging 52 is fixed on right waterproof filling member 42 by bolt 7, so that left support plate 51 and right support plate 52 can be very square
Just it is dismantled.
Optionally, bolt 7 is M8 bolt.
Further, it please refers to Fig.1 to Fig.3, as a kind of specific embodiment of expansion gap device provided by the invention,
Left pontic 81 further includes left pave-load layer 61, and right pontic 82 further includes right pave-load layer 62；Left pave-load layer 61 is anti-with a left side for being laid on
On the adjacent left stretcher body 11 of water filling member 51, right pave-load layer 62 is for being laid on the right stretcher body 12 adjacent with right waterproof filling member 52
On；The upper surface of left pave-load layer 61, the upper surface of right pave-load layer 62, the upper surface of left support plate 51 and right interconnecting piece 22
Upper surface is located in same plane.
Further, it please refers to Fig.1 to Fig.3, as a kind of specific embodiment of expansion gap device provided by the invention,
Non-slip texture is provided on the top surface of right support plate 52.Such pedestrian is not easy to slip when stepping down in right support plate.
Optionally, in one embodiment, the construction method of expansion gap device are as follows:
One, construction method
(1) left stretcher body 11, right stretcher body 12 are completed, completes to pour slot after reserving after left pave-load layer 61 and right pave-load layer 62.
(2) it is poured after in slot and pours left waterproof filling member 41 and right waterproof filling member 42.
(3) water blocking tape 2 is installed；Left interconnecting piece 21 is adhered on left waterproof filling member 41 by foamed glue 32；Pass through bubble
Right interconnecting piece 22 is adhered on right waterproof filling member 42 by foam glue 32.
(4) it fills in sealing filler 31 to recessed portion 24；Left support plate 51 and right support plate 52 are installed by bolt 7.
(5) expansion gap device is installed.
Two, replacing options
(1) sandstone in expansion joint is cleared up；
(2) back-out bolt 7, dismantle left support plate 51 and right support plate 52；
(3) sealing filler 31 is removed；
(4) water blocking tape 2 is replaced, left interconnecting piece 21 is adhered on left waterproof filling member 41 by foamed glue 32；Pass through bubble
Right interconnecting piece 22 is adhered on right waterproof filling member 42 by foam glue 32；
(5) it fills in sealing filler 31 to recessed portion 24；Left support plate 51 and right support plate 52 are installed by bolt 7.
(6) expansion gap device replacement is completed.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. expansion gap device, including left pontic and right pontic, there are expansion joints between the left pontic and the right pontic, special
Sign is: further including water blocking tape；The water blocking tape includes the left interconnecting piece being sealingly attached on the left pontic and hermetically
The right interconnecting piece being connected on the right pontic, and the centre being connect respectively with the left interconnecting piece and the right interconnecting piece
Portion；The middle part is bent downwardly to form the recessed portion being filled in the expansion joint.
2. expansion gap device as described in claim 1, it is characterised in that: be filled with sealing filler in the recessed portion.
3. expansion gap device as claimed in claim 2, it is characterised in that: water bubble plate until the sealing filler.
4. expansion gap device as described in claim 1, it is characterised in that: the water blocking tape is integral piece made of rubber.
5. such as the described in any item expansion gap devices of Claims 1-4, it is characterised in that: the left pontic include left stretcher body and
Left waterproof filling member, the right pontic include right stretcher body and right waterproof filling member, and the left waterproof filling member is arranged on the left side
On frame body, the right waterproof filling member is arranged on the right stretcher body；The left interconnecting piece is sealingly attached to the left waterproof
On filling member, the right interconnecting piece is sealingly attached on the right waterproof filling member.
6. expansion gap device as claimed in claim 5, it is characterised in that: the left waterproof filling member and the right waterproof filling
Part integral piece made of mortar pours.
7. expansion gap device as claimed in claim 5, it is characterised in that: the left interconnecting piece and the left waterproof filling member it
Between be filled with foamed glue, between the right interconnecting piece and the right waterproof filling member be filled with foamed glue.
8. expansion gap device as claimed in claim 5, it is characterised in that: be provided with left support on the left interconnecting piece upper surface
Plate is provided with right support plate on the right interconnecting piece upper surface, and the right support plate is covered on above the expansion joint, and described
One end of right support plate is supported in the left support plate, being capable of opposite sliding between left support plate and the right support plate.
9. expansion gap device as claimed in claim 8, it is characterised in that: the left pontic further includes left pave-load layer, the right side
Pontic further includes right pave-load layer；The left pave-load layer is for being laid on the left stretcher body adjacent with the left waterproof filling member
On, the right pave-load layer is for being laid on the right stretcher body adjacent with the right waterproof filling member；The left pave-load layer
Upper surface, the upper surface of the right pave-load layer, the upper surface of the left support plate and the right interconnecting piece upper surface difference
It is in the same plane.
10. expansion gap device as claimed in claim 8, it is characterised in that: be provided on the top surface of the right support plate anti-skidding
Lines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910023083.9A CN110230256A (en) | 2019-01-10 | 2019-01-10 | Expansion gap device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910023083.9A CN110230256A (en) | 2019-01-10 | 2019-01-10 | Expansion gap device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110230256A true CN110230256A (en) | 2019-09-13 |
Family
ID=67860095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910023083.9A Pending CN110230256A (en) | 2019-01-10 | 2019-01-10 | Expansion gap device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110230256A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113174844A (en) * | 2021-04-27 | 2021-07-27 | 江苏铁龙环保设备有限公司 | Expansion joint |
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| KR20030077683A (en) * | 2002-03-26 | 2003-10-04 | 금초건설주식회사 | The fabricated expansion joint and installation method without concrete-breaking |
| CN102787556A (en) * | 2012-08-31 | 2012-11-21 | 中铁二院工程集团有限责任公司 | Changeable retractor device for railroad bridge |
| CN103510468A (en) * | 2013-10-17 | 2014-01-15 | 宁波路宝科技实业集团有限公司 | Non-concrete type bridge expansion joint device |
| CN205387668U (en) * | 2016-03-10 | 2016-07-20 | 北京华创竣杰工程技术有限公司 | Waterproof type expansion joint device of bridge elasticity |
| CN207597253U (en) * | 2017-12-01 | 2018-07-10 | 北京市市政专业设计院股份公司 | A kind of bridge expanssion joint sealing structure |
| CN208328683U (en) * | 2018-06-28 | 2019-01-04 | 衡水中铁建工程橡胶有限责任公司 | A kind of reinforcement sealing structure of bridge expanssion joint |
| CN209584826U (en) * | 2019-01-10 | 2019-11-05 | 深圳市城市交通规划设计研究中心有限公司 | Expansion gap device |
-
2019
- 2019-01-10 CN CN201910023083.9A patent/CN110230256A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030077683A (en) * | 2002-03-26 | 2003-10-04 | 금초건설주식회사 | The fabricated expansion joint and installation method without concrete-breaking |
| CN102787556A (en) * | 2012-08-31 | 2012-11-21 | 中铁二院工程集团有限责任公司 | Changeable retractor device for railroad bridge |
| CN103510468A (en) * | 2013-10-17 | 2014-01-15 | 宁波路宝科技实业集团有限公司 | Non-concrete type bridge expansion joint device |
| CN205387668U (en) * | 2016-03-10 | 2016-07-20 | 北京华创竣杰工程技术有限公司 | Waterproof type expansion joint device of bridge elasticity |
| CN207597253U (en) * | 2017-12-01 | 2018-07-10 | 北京市市政专业设计院股份公司 | A kind of bridge expanssion joint sealing structure |
| CN208328683U (en) * | 2018-06-28 | 2019-01-04 | 衡水中铁建工程橡胶有限责任公司 | A kind of reinforcement sealing structure of bridge expanssion joint |
| CN209584826U (en) * | 2019-01-10 | 2019-11-05 | 深圳市城市交通规划设计研究中心有限公司 | Expansion gap device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113174844A (en) * | 2021-04-27 | 2021-07-27 | 江苏铁龙环保设备有限公司 | Expansion joint |
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