CN104405975A - Steel pipe with bell and spigot joints - Google Patents
Steel pipe with bell and spigot joints Download PDFInfo
- Publication number
- CN104405975A CN104405975A CN201410548040.XA CN201410548040A CN104405975A CN 104405975 A CN104405975 A CN 104405975A CN 201410548040 A CN201410548040 A CN 201410548040A CN 104405975 A CN104405975 A CN 104405975A
- Authority
- CN
- China
- Prior art keywords
- steel pipe
- socket
- joint
- pipe
- steel
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 123
- 239000010959 steel Substances 0.000 title claims abstract description 123
- 238000003466 welding Methods 0.000 claims abstract description 19
- 239000011159 matrix material Substances 0.000 claims description 17
- 238000007789 sealing Methods 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 abstract 1
- 229920003023 plastic Polymers 0.000 description 20
- 239000004033 plastic Substances 0.000 description 20
- 239000004698 Polyethylene Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 12
- 239000002131 composite material Substances 0.000 description 11
- -1 polyethylene Polymers 0.000 description 10
- 229920000573 polyethylene Polymers 0.000 description 10
- 238000009413 insulation Methods 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000006260 foam Substances 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009342 intercropping Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectable pipe joints, e.g. soldered, adhesive, or caulked joints
- F16L13/02—Welded joints
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L21/00—Joints with sleeve or socket
- F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92019—Pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92209—Temperature
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention discloses a steel pipe with bell and spigot joints. The steel pipe comprises a basal steel pipe, wherein the basal steel pipe is a cylindrical pipe having a spiral welded junction and formed by spirally rolling, welding and fixedly connecting steel plates. The steel pipe is characterized by further comprising a spigot joint steel pipe and a horn-shaped bell joint; at least two annular grooves for placing sealing rings are formed in the outer surface of the spigot joint steel pipe; the two ends of the spigot joint steel pipe are respectively an inserting end and a welding end; a conical surface in sealing contact with the bell joint is arranged at the outer side of the inserting end of the spigot joint steel pipe; one end of the basal steel pipe is welded and fixedly connected with the welding end of the spigot joint steel pipe; and the other end is welded and fixedly connected with the small end of the horn-shaped bell joint. Connecting structures are as follows: the spigot joint steel pipe of the previous steel pipe is in sealing contact with the conical part of the horn-shaped bell joint of the next steel pipe through the conical surface of the spigot joint; and the spigot joint steel pipe of the previous steel pipe is in sealing contact with the horn-shaped bell joint of the next steel pipe through the sealing ring thereon. The steel pipe has such advantages as simple structure, high sealing reliability, quick mounting, convenience for maintenance and disassembly and long service life.
Description
Technical field
The present invention relates to pipeline, is a kind of steel pipe with joint socket, can for the manufacture of during large-diameter steel-plastic composite pipe as matrix steel tube, the caliber metal pipeline that also can be used as bayonet joint is directly used in pipeline transport.
Background technique
Pipeline transport be with pipeline as the means of transportation of a kind of long distance delivery liquids and gases goods and materials of means of transportation, have freight volume large, take up an area less, the pipeline transport construction period is short, expense is low, pipeline transport is safe and reliable, continuity is strong, pipeline transport consumes energy less, cost is low, profitable advantage.Pipe is the main member forming pipeline, pipe has steel pipe, cast iron tube, concrete reinforced pipe, nonmetallic pipe several by material, Placement has socket joint connection, Flange joint, welding, bonding several, it is convenient and swift, Placement safely and efficiently during pipe connects that socket joint connects, because socket joint jointing type pipe belongs to reducer, in the pipe of prior art, be only applied on cast iron tube and concrete reinforced pipe, for steel pipe, usually adopt Flange joint or welding.
Steel-plastic composite pipe is the chemical building material pipeline of a new generation, compared with traditional metallic conduit or plastic pipe, has unrivaled advantage at mechanical property, chemical property, comprehensive cost performance aspects.Exploitation, the production of steel-plastic composite pipe production line have good economic benefit and social benefit.The steel-plastic composite pipe size bore≤φ 200mm of current domestic production, length≤7m, Placement takes welding manner usually, welding manner is adopted to be non-dismountable structure, the bad docking of two pipes, weld bad weldering, particularly bottom welding is very difficult, may produce gas leakage, water phenomenon, inconvenient maintenance; Also have employing flange connection, but working life is low, it is unreliable to seal.
Summary of the invention
Technical problem to be solved by this invention is: the shortcoming overcoming prior art, there is provided a kind of structure simple, sealing reliability is high, quick for installation, repair demolition is convenient, the steel pipe with joint socket of long service life, for the manufacture of during large-diameter steel-plastic composite pipe as matrix steel tube, the caliber metal pipeline that also can be used as bayonet joint is directly used in pipeline transport.
The scheme of technical solution problem of the present invention is: a kind of steel pipe with joint socket, it comprises matrix steel tube, described matrix steel tube rolls welding by steel plate with spiral to be connected to form spirality weld bond or directly rolled welding by steel plate and to be connected and to form the cylindrical tube of vertical masonry joint weld bond, it is characterized in that: also comprise socket steel pipe and horn-like bellmouth, the outer surface of described socket steel pipe be provided with at least twice for settling the annular groove of seal ring, the two ends of socket steel pipe are respectively bayonet end and welding ends, be provided with outside the bayonet end of socket steel pipe and seal with bellmouth the conical surface contacted, one end of matrix steel tube is welded with the welding ends of socket steel pipe and is connected, the other end welds with the small end of horn-like bellmouth and is connected.
Linkage structure between described adjacent front steel pipe and rear steel pipe is: the socket steel pipe of described front steel pipe is sealed with the tapering of the horn-like bellmouth of rear steel pipe by socket conical surface and contacts, and the socket steel pipe of front steel pipe is sealed with the horn-like bellmouth of rear steel pipe by the seal ring that it is arranged and contacts.
The conical surface of described socket steel pipe bayonet end is also provided with the turned welt groove of one annular.
The bore of described steel pipe is φ 75 ㎜ ~ φ 3000 ㎜, and length is 7m ~ 12m.
The steel pipe with joint socket of the present invention, owing to adopting socket and bellmouth socket joint, tapering seals and Double seal ring is tightly connected mode, have structure simply, sealing reliability is high, quick for installation, and repair demolition facilitates, the advantages such as long service life.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention has the steel pipe of joint socket;
Fig. 2 is the close-up schematic view of Fig. 1;
Fig. 3 is the linkage structure schematic diagram that the present invention has the steel pipe of joint socket.
In figure: 1 horn-like bellmouth, 2 matrix steel tubes, 3 socket steel pipes, 4 annular grooves, 5 conical surfaces, 6 turned welt grooves, steel pipe before 7,8 seal rings, steel pipe after 9.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
With reference to Fig. 1 ~ Fig. 3, embodiment 1, manufactures the steel pipe of φ 500 × 9000, adopts O RunddichtringO.It comprises matrix steel tube 2, described matrix steel tube 2 rolls with spiral for steel plate, between welding be connected and form the cylindrical tube of spirality weld bond, also comprise socket steel pipe 3 and horn-like bellmouth 1, the outer surface of described socket steel pipe 3 is provided with twice for settling the annular groove 4 of seal ring 8, the two ends of socket steel pipe 3 are respectively bayonet end and welding ends, be provided with the conical surface 5 sealing with bellmouth and contact outside the bayonet end of socket steel pipe 3, one end of matrix steel tube 2 weld with the welding ends of socket steel pipe 3 be connected, the other end welds with the small end of horn-like bellmouth 1 and is connected.Linkage structure between described adjacent front steel pipe 7 and rear steel pipe 9 is: the socket steel pipe of described front steel pipe 73 is sealed with the tapering of the horn-like bellmouth 1 of rear steel pipe 9 by conical surface 5 and contacts, and the socket steel pipe 3 of front steel pipe 7 to seal with the horn-like bellmouth 1 of rear steel pipe 9 contact by it being arranged seal ring 8.The present embodiment adopts prior art manufacture, and seal ring 8 is the commercially available prod of prior art.
Embodiment 2, and manufacture the steel-plastic composite pipe of φ 500 × 9000, internal lining pipe is polyethylene material.The present embodiment is substantially the same manner as Example 1, and difference is: on the steel pipe socket steel pipe conical surface with joint socket that embodiment 1 is obtained, be provided with turned welt groove 6, and with it for matrix steel tube, manufacture steel-plastic composite pipe.In the matrix steel tube 2 being fixed with socket steel pipe 3 and horn-like bellmouth 1, compound is connected polyethylene liner pipe form taper flange on the mouth limit of socket steel pipe 3.During connection, the socket steel pipe 3 of described front steel-plastic composite pipe to be sealed with the polyethylene liner pipe cone section of horn-like bellmouth 1 compound of rear steel-plastic composite pipe by taper flange that polyethylene liner pipe is formed and contacts, and the socket steel pipe 3 of front steel-plastic composite pipe is contacted with the polyethylene liner seal of tube of horn-like bellmouth 1 compound of rear steel-plastic composite pipe by two seal rings 8 of its upper setting.The present embodiment adopts prior art manufacture, and seal ring 8 is the commercially available prod of prior art.
Embodiment 3, and manufacture the steel plastic compount thermal insulation pipe of φ 500 × 9000, internal lining pipe is polyethylene material, and outer pillar is PE material.The present embodiment is substantially the same manner as Example 1, difference: on the steel pipe socket steel pipe conical surface with joint socket that embodiment 1 is obtained, be provided with turned welt groove 6, and be matrix steel tube 2 with it, manufacture steel plastic compount thermal insulation pipe.In the matrix steel tube 2 being fixed with socket steel pipe 3 and horn-like bellmouth 1, compound is connected polyethylene liner pipe form taper flange on the mouth limit of socket steel pipe 3, at the outer pillar of the matrix steel tube 2 being fixed with socket steel pipe 3 and horn-like bellmouth 1 outer socket PE, between insulating foam layer is set.During connection, the socket steel pipe 3 of described front steel plastic compount thermal insulation pipe to be sealed with the polyethylene liner pipe cone section of horn-like bellmouth 1 compound of rear steel plastic compount thermal insulation pipe by taper flange that polyethylene liner pipe is formed and contacts, the socket steel pipe 3 of front steel plastic compount thermal insulation pipe is contacted with the polyethylene liner seal of tube of horn-like bellmouth 1 compound of rear steel plastic compount thermal insulation pipe by two seal rings 8 that it is arranged, then the coated outer covering layer in outside between the insulating foam layer and the insulating foam layer of rear steel plastic compount thermal insulation pipe of front steel plastic compount thermal insulation pipe, make vent and hide with the dressing of ventilation, middle intercropping material hole, after injecting stabilizer, sealing material hole.The present embodiment adopts prior art manufacture, and seal ring 8, stabilizer are the commercially available prod of prior art.
Claims (4)
1. one kind has the steel pipe of joint socket, it comprises matrix steel tube, described matrix steel tube rolls welding by steel plate with spiral to be connected to form spirality weld bond or directly rolled welding by steel plate and to be connected and to form the cylindrical tube of vertical masonry joint weld bond, it is characterized in that: also comprise socket steel pipe and horn-like bellmouth, the outer surface of described socket steel pipe be provided with at least twice for settling the annular groove of seal ring, the two ends of socket steel pipe are respectively bayonet end and welding ends, be provided with outside the bayonet end of socket steel pipe and seal with bellmouth the conical surface contacted, one end of matrix steel tube is welded with the welding ends of socket steel pipe and is connected, the other end welds with the small end of horn-like bellmouth and is connected.
2. there is the steel pipe of joint socket as claimed in claim 1, it is characterized in that: the linkage structure between described adjacent front steel pipe and rear steel pipe is: the socket steel pipe of described front steel pipe is sealed with the tapering of the horn-like bellmouth of rear steel pipe by socket conical surface and contacts, the socket steel pipe of front steel pipe is sealed with the horn-like bellmouth of rear steel pipe by the seal ring that it is arranged and contacts.
3. there is the steel pipe of joint socket as claimed in claim 1, it is characterized in that: the turned welt groove conical surface of described socket steel pipe bayonet end being also provided with one annular.
4. there is the steel pipe of joint socket as claimed in claim 1, it is characterized in that: described in there is the steel pipe of joint socket bore be φ 75 ㎜ ~ φ 3000 ㎜, length is 7m ~ 12m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410548040.XA CN104405975A (en) | 2014-09-02 | 2014-10-16 | Steel pipe with bell and spigot joints |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2014104421813 | 2014-09-02 | ||
| CN201410442181 | 2014-09-02 | ||
| CN201410548040.XA CN104405975A (en) | 2014-09-02 | 2014-10-16 | Steel pipe with bell and spigot joints |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104405975A true CN104405975A (en) | 2015-03-11 |
Family
ID=52619152
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410547937.0A Active CN104565583B (en) | 2014-09-02 | 2014-10-16 | Socket joint jointing type plastic lining steel-plastic composite pipe and manufacture method thereof |
| CN201410548040.XA Pending CN104405975A (en) | 2014-09-02 | 2014-10-16 | Steel pipe with bell and spigot joints |
| CN201420598455.3U Expired - Lifetime CN204187150U (en) | 2014-09-02 | 2014-10-16 | Socket joint jointing type plastic lining steel-plastic composite pipe |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410547937.0A Active CN104565583B (en) | 2014-09-02 | 2014-10-16 | Socket joint jointing type plastic lining steel-plastic composite pipe and manufacture method thereof |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420598455.3U Expired - Lifetime CN204187150U (en) | 2014-09-02 | 2014-10-16 | Socket joint jointing type plastic lining steel-plastic composite pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (3) | CN104565583B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105299332A (en) * | 2015-11-10 | 2016-02-03 | 上海万朗管业有限公司 | All-steel sealing connector of large-caliber reinforced concrete top pipe |
| CN106015776A (en) * | 2016-08-11 | 2016-10-12 | 四川国统混凝土制品有限公司 | Steel pipe free of field welding and construction method thereof |
| CN107781541A (en) * | 2016-08-24 | 2018-03-09 | 浙江三花智能控制股份有限公司 | The interface structure and tube assembly of a kind of multiple tube |
| CN109253346A (en) * | 2018-10-17 | 2019-01-22 | 山东禹王管业有限公司 | A kind of bell and spigot anti-corrosive steel tube |
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| CN104565583B (en) * | 2014-09-02 | 2015-11-11 | 吉林钰翎珑钢管钢构制造有限公司 | Socket joint jointing type plastic lining steel-plastic composite pipe and manufacture method thereof |
| JP6422843B2 (en) * | 2015-10-27 | 2018-11-14 | 日新製鋼株式会社 | Tubular structure and manufacturing method thereof |
| CN106216430B (en) * | 2016-07-29 | 2018-09-04 | 新昌县长城空调部件股份有限公司 | Gas-fired kitchen appendix manufacturing process |
| CN106402520B (en) * | 2016-11-24 | 2018-08-14 | 山东鲍尔浦塑胶股份有限公司 | Flow-adjustable fiber-reinforced polyethylene pipe and application thereof |
| CN106594406B (en) * | 2017-02-16 | 2017-11-21 | 湖南振辉管业有限公司 | A kind of inner lining plastic tube cast iron pipe and its manufacture method |
| CN107031031B (en) * | 2017-06-15 | 2019-02-01 | 青岛海聚新材料科技有限公司 | A kind of reinforced thermoplastics multiple tube forming apparatus for forming pipe end and method |
| CN107654748B (en) * | 2017-09-25 | 2023-08-18 | 湖南振辉管业有限公司 | A plastic-pipe socket-type metal pipe lined with a port reinforcement ring and its manufacturing method |
| CN110303593B (en) * | 2018-03-27 | 2020-12-15 | 北京跃通水泥制品有限公司 | Preparation method and preparation device of reinforced concrete pipe |
| CN108973105B (en) * | 2018-08-16 | 2023-10-24 | 宜昌中南精密钢管有限公司 | Forming tool and method for lining stainless steel composite pipe |
| CN109185585A (en) * | 2018-10-23 | 2019-01-11 | 江苏青阳管业有限公司 | A kind of compound pipe connection of bite type inner liner stainless steel |
| CN110360387B (en) * | 2019-07-19 | 2021-05-28 | 上海英泰塑胶股份有限公司 | Outer-sleeved steel inner-plastic-lined anti-corrosion high-pressure-resistant pipe fitting and manufacturing method thereof |
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| CN113189652B (en) * | 2021-05-06 | 2024-04-19 | 天津军星管业集团有限公司 | Welding monitoring equipment and welding monitoring method for steel-plastic composite pressure pipeline |
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| WO2024055096A1 (en) * | 2022-09-15 | 2024-03-21 | PMC Pumps Inc. | Apparatus, system and method for insulated conducting of fluids |
| CN117400542B (en) * | 2023-12-14 | 2024-04-16 | 宝成重工有限公司 | Automatic casing equipment, plastic-lined composite pipe fitting and casing process |
| CN119115453B (en) * | 2024-10-30 | 2025-07-18 | 天津市久盛通达科技有限公司 | A stamping method for socket-type flexible joint steel pipe |
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2014
- 2014-10-16 CN CN201410547937.0A patent/CN104565583B/en active Active
- 2014-10-16 CN CN201410548040.XA patent/CN104405975A/en active Pending
- 2014-10-16 CN CN201420598455.3U patent/CN204187150U/en not_active Expired - Lifetime
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105299332A (en) * | 2015-11-10 | 2016-02-03 | 上海万朗管业有限公司 | All-steel sealing connector of large-caliber reinforced concrete top pipe |
| CN106015776A (en) * | 2016-08-11 | 2016-10-12 | 四川国统混凝土制品有限公司 | Steel pipe free of field welding and construction method thereof |
| CN107781541A (en) * | 2016-08-24 | 2018-03-09 | 浙江三花智能控制股份有限公司 | The interface structure and tube assembly of a kind of multiple tube |
| CN107781541B (en) * | 2016-08-24 | 2019-12-03 | 浙江三花智能控制股份有限公司 | a pipe assembly |
| CN109253346A (en) * | 2018-10-17 | 2019-01-22 | 山东禹王管业有限公司 | A kind of bell and spigot anti-corrosive steel tube |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104565583B (en) | 2015-11-11 |
| CN104565583A (en) | 2015-04-29 |
| CN204187150U (en) | 2015-03-04 |
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