CN105715878A - Pushing nodular cast iron pipe and pipe connecting structure thereof - Google Patents
Pushing nodular cast iron pipe and pipe connecting structure thereof Download PDFInfo
- Publication number
- CN105715878A CN105715878A CN201610265628.3A CN201610265628A CN105715878A CN 105715878 A CN105715878 A CN 105715878A CN 201610265628 A CN201610265628 A CN 201610265628A CN 105715878 A CN105715878 A CN 105715878A
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- Prior art keywords
- ring
- socket
- face
- pushing tow
- avulsion
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Classifications
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- 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
- F16L9/02—Rigid pipes of metal
-
- 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
- F16L21/08—Joints with sleeve or socket with additional locking means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Joints Allowing Movement (AREA)
- Joints With Sleeves (AREA)
Abstract
The invention provides a pushing nodular cast iron pipe and a pipe connecting structure. The inner surface of a socket is sequentially provided with an anti-dropping cavity, a welding ring contact arc face and a sealing cavity from the socket to an insertion opening in the axial direction; the longitudinal section of the anti-dropping cavity is in a wedge shape, the anti-dropping cavity comprises a rising slope and an anti-dropping vertical face, and the welding ring contact arc face is located at the end of the anti-dropping vertical face; the sealing cavity comprises a limiting vertical face, a step-shaped falling slope and a pushing vertical face which are sequentially connected; the outer surface of the insertion opening is provided with a welding ring and a force bearing boss which are sequentially distributed in the axial direction from the insertion opening to the socket, the distance between the end face, close to the insertion opening, of the force bearing boss and the end face, close to the insertion opening, of the welding ring is equal to the distance between the end face of the socket and the welding ring contact arc face, and the distance between the end face, close to the insertion opening, of the force bearing boss and the end face of the insertion opening is equal to the distance between the end face of the socket and the pushing vertical face; and an anti-dropping ring is arranged in the anti-dropping cavity, and a sealing rubber ring is arranged in the sealing cavity. In the backwards-dragging process of the pushing nodular cast iron pipe, the capacity of bearing the pulling force and the pushing force is achieved at the same time, and the connecting intensity of a pipe connector is high.
Description
Technical field
The present invention relates to a kind of ductile iron pipeline and pipe connecting structure, belong to trenchless engineering technical field.
Background technology
In recent years; along with improving constantly that urban environmental protection requires; for reducing the ground excavation destruction to environment; and to the negative effect that urban transportation and resident living are brought; the technical way that horizontal directional drill (HorizontalDirectionalDrilling, HDD) is increasingly becoming under urban area, rivers and lakes, nature reserve area and bad ground environment underground pipe network to be laid.Ductile iron pipe is a kind of novel tube introduced in recent years and develop, and adopts centrifugal casting molding, and tube wall is fine and close.Owing to its tensile strength is high, metal ductility is good and antiseptic property excellent, is more and more used as city pressure pipeline.
At present, the Engineering Projects adopting horizontal directional drill laying ductile iron pipe is still rare at home, main reason is that the ductile iron pipe being currently used for horizontal directional drill can only bear limited pulling force, tamping tube hammer or the active force of other auxiliary top pushing devices can not be born, thus cause pipeline returning distance critical constraints, return be pulled through in journey construction risk be significantly increased.Therefore, how research makes ductile iron pipe return the ability being pulled through in journey to be provided simultaneously with bearing pulling force and jacking force, and how to increase maximum time drag of ductile iron pipe from having important practical significance for adopting horizontal directional drill to lay ductile iron pipe.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art and provide a kind of and returning the pushing tow ductile iron pipe and the pipe connecting structure thereof that are pulled through in journey to be provided simultaneously with bearing the ability of pulling force and jacking force.
Realizing the technical scheme that the object of the invention adopts is, a kind of pushing tow ductile iron pipe, at least include the bellmouth and the socket that match, the inner surface of described bellmouth is provided with anti-avulsion chamber, weld-ring contacting surface and annular seal space, and anti-avulsion chamber, weld-ring contacting surface and annular seal space are axially distributed from bellmouth to socket order along pushing tow ductile iron pipe；The longitudinal section in described anti-avulsion chamber is wedge shaped, and including rising ramp and anti-avulsion vertical plane, weld-ring contacting surface is positioned at the end of anti-avulsion vertical plane；Described annular seal space includes the spacing vertical plane being linked in sequence, stepped falling ramp and pushing tow vertical plane；The outer surface of described socket is provided with weld-ring and load boss, weld-ring and load boss are axially distributed from socket to bellmouth order along pushing tow ductile iron pipe, load boss is equal to bellmouth end face distance to weld-ring contacting surface with weld-ring near the distance of the end face of socket near the end face of socket, and load boss is equal to the bellmouth end face distance to pushing tow vertical plane near the end face of socket with the distance of socket end face.
The middle part of described stepped falling ramp is provided with spacing preiection.
The longitudinal section of described load boss is at right angles trapezoidal, and the right angle waist of right-angled trapezium is positioned at load boss on the end face of socket.
Load boss and socket are the integral structure of casting, and weld-ring is fixedly welded on socket outer surface.
The diameter of load boss is identical with the external diameter of bellmouth end face.
The equal arc transition in junction of the junction of rising ramp and the junction of anti-avulsion vertical plane, weld-ring contacting surface and anti-avulsion vertical plane and stepped falling ramp and pushing tow vertical plane.
The present invention also correspondence provides the pipe connecting structure for above-mentioned pushing tow ductile iron pipe, the socket of located anteriorly pushing tow ductile iron pipe is embedded in the bellmouth of the pushing tow ductile iron pipe being arranged in its rear, anti-avulsion chamber and the annular seal space of the outer surface closing bellmouth of socket constitute anti-avulsion room and closed chamber, anti-avulsion is provided with falling-resistant ring in room, the longitudinal section of described falling-resistant ring is at right angles trapezoidal, and the inclined-plane, oblique waist place of falling-resistant ring is parallel to the rising ramp in anti-avulsion chamber；Being provided with O-ring seal in closed chamber, described O-ring seal is stepped sealing ring, and the stepped falling ramp of the outer ring surface of O-ring seal and annular seal space matches.
Bellmouth and the outer surface of spigot connection are enclosed with gum elastic set.
The junction arc transition of the outer ring surface of described falling-resistant ring and inner ring surface.
As shown from the above technical solution, pushing tow ductile iron pipe provided by the invention, at its bellmouth inner surface, anti-avulsion chamber is set, weld-ring contacting surface and annular seal space, adjacent two pipelines are connected with bellmouth by socket, in pipeline returning process, 1, when pushing tow ductile iron pipe bears traction force, traction force is along O-ring seal, annular seal space, falling-resistant ring and the order transmission of anti-avulsion chamber, anti-avulsion chamber includes rising ramp and anti-avulsion vertical plane, rising ramp is pipeline working surface when bearing traction force, annular seal space includes the spacing vertical plane being linked in sequence, stepped falling ramp and pushing tow vertical plane, spacing vertical plane and stepped falling ramp are pipeline working surface when bearing traction force, owing to the longitudinal section of falling-resistant ring is at right angles trapezoidal, the Ji Yao inclined-plane, inclined-plane, oblique waist place of falling-resistant ring is parallel with rising ramp, O-ring seal is stepped sealing ring, its outer ring surface and stepped falling ramp match, when pushing tow ductile iron pipe bears traction force, bellmouth under the effect of traction force with socket generation relative movement, waist inclined-plane and rising ramp move closer to until being in close contact, falling-resistant ring locking anti-avulsion room, meanwhile, the hierarchic structure of O-ring seal is embedded in the hierarchic structure of stepped falling ramp, and by spacing vertical plane axial limiting, O-ring seal lock sealing room, at O-ring seal, annular seal space, under the combined effect in falling-resistant ring and anti-avulsion chamber, adjacent two pushing tow ductile iron pipes are stably connected with, and traction force is transmitted to the pushing tow ductile iron pipe order being followed by；2, when pushing tow ductile iron pipe bears jacking force, jacking force is along pushing tow vertical plane, socket end face, stepped falling ramp, O-ring seal, weld-ring contacting surface, weld-ring, bellmouth end face and the order transmission of load boss, due in pushing tow ductile iron pipe, load boss is equal to bellmouth end face distance to weld-ring contacting surface with weld-ring near the distance of the end face of socket near the end face of socket, load boss is equal to the bellmouth end face distance to pushing tow vertical plane near the end face of socket with the distance of socket end face, above structure guarantees that pipeline bears weld-ring and weld-ring contacting surface during jacking force, load boss contacts with pushing tow vertical plane with bellmouth end face and socket end face simultaneously, jointly jacking force is transferred on bellmouth by socket, realize the transmission of jacking force, O-ring seal is carried out axial limiting by the step of stepped falling ramp, auxiliary transmission jacking force.
Compared with prior art, the beneficial effects of the present invention is:
1, pushing tow ductile iron pipe provided by the invention, at the axially disposed load-carrying construction matched of its bellmouth inner surface and socket outer surface, wherein bellmouth inner surface arranges anti-avulsion chamber, weld-ring contacting surface and annular seal space, confined planes is provided, socket outer surface arranges weld-ring and load boss, falling-resistant ring and O-ring seal are set between bellmouth and socket, weld-ring, falling-resistant ring and O-ring seal provide locking mechanism, load boss provides jacking force main stress face, said structure coordinates jointly so that this pushing tow ductile iron pipe is returning the ability being pulled through in journey to be provided simultaneously with bearing pulling force and jacking force；
2, load boss and socket are the integral structure of casting, weld-ring is fixedly welded on socket outer surface, anti-avulsion chamber, weld-ring contacting surface and annular seal space are directly opened on bellmouth inner surface, for a part for bellmouth inner surface, monolithic construction ensures that pushing tow ductile iron pipe has the excellent rigidity of structure；
3, the junction of anti-avulsion chamber, weld-ring contacting surface and annular seal space interior surface and the outer ring surface of falling-resistant ring all adopt arc transition with the junction of inner ring surface, stress is avoided to concentrate the pipeline break caused, the middle part of stepped falling ramp is provided with spacing preiection, when O-ring seal volume is bigger for the axial auxiliary stopper of O-ring seal；
4, the outer surface of bellmouth and spigot connection is enclosed with gum elastic set, avoid returning the pipe joint and bellmouth and spigot connection that are pulled through in journey landwaste fine grained and enter pushing tow ductile iron pipe, thus ensureing to affect the sealing effectiveness of the free deflection performance of pipeline and joint.
Accompanying drawing explanation
Fig. 1 is the structural representation of pushing tow ductile iron pipe provided by the invention.
Fig. 2 is pushing tow ductile iron pipe joint connection diagram under traction force effect.
Fig. 3 is pushing tow ductile iron pipe joint connection diagram under jacking force effect.
Wherein, 1-pipe shaft, 2-bellmouth, 3-socket, 4-anti-avulsion chamber, 41-rising ramp, 42-anti-avulsion vertical plane, 5-weld-ring contacting surface, 6-annular seal space, the spacing vertical plane of 61-, the stepped falling ramp of 62-, 63-pushing tow vertical plane, 7-weld-ring, 8-load boss, 9-spacing preiection, 10-falling-resistant ring, 11-O-ring seal, 12-gum elastic set.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention being illustrated in detail, present disclosure is not limited to following example.
Pushing tow ductile iron pipe provided by the invention, its structure is as shown in Figure 1, including pipe shaft 1 and be positioned at pipe shaft 1 two ends and the bellmouth 2 matched and socket 3, the inner surface of described bellmouth 2 is provided with anti-avulsion chamber 4, weld-ring contacting surface 5 and annular seal space 6, and anti-avulsion chamber 4, weld-ring contacting surface 5 and annular seal space 6 are axially distributed from bellmouth to socket order along pushing tow ductile iron pipe；The longitudinal section in described anti-avulsion chamber 4 is wedge shaped, including rising ramp 41 and anti-avulsion vertical plane 42, the junction arc transition of rising ramp 41 and anti-avulsion vertical plane 42, weld-ring contacting surface 5 is positioned at the end of anti-avulsion vertical plane 42, namely anti-avulsion vertical plane 42 is near the side of axis, the junction arc transition of weld-ring contacting surface 5 and anti-avulsion vertical plane 42；Described annular seal space 6 includes the spacing vertical plane 61, stepped falling ramp 62 and the pushing tow vertical plane 63 that are linked in sequence, and the middle part of stepped falling ramp 62 is provided with spacing preiection 9, the junction arc transition of stepped falling ramp 62 and pushing tow vertical plane 63；The outer surface of described socket 3 is provided with weld-ring 7 and load boss 8, weld-ring 7 and load boss 8 are axially distributed from socket to bellmouth order along pushing tow ductile iron pipe, the longitudinal section of described load boss 8 is at right angles trapezoidal, the right angle waist of right-angled trapezium is positioned at load boss on the end face of socket, load boss 8 and socket are the integral structure of casting, the diameter of load boss is identical with the external diameter of bellmouth end face, weld-ring 7 is fixedly welded on socket outer surface, load boss 8 is equal to bellmouth end face distance to weld-ring contacting surface 5 with weld-ring 7 near the distance of the end face of socket near the end face of socket, load boss is equal to the bellmouth end face distance to pushing tow vertical plane near the end face of socket with the distance of socket end face.
The present invention also correspondence provides the pipe connecting structure for above-mentioned pushing tow ductile iron pipe, referring to Fig. 2 and Fig. 3, the socket 3 of located anteriorly pushing tow ductile iron pipe is embedded in the bellmouth 2 of the pushing tow ductile iron pipe being arranged in its rear, bellmouth and the outer surface of spigot connection are enclosed with gum elastic set 12, anti-avulsion chamber and the annular seal space of the outer surface closing bellmouth of socket constitute anti-avulsion room and closed chamber, anti-avulsion room is provided with falling-resistant ring 10, the longitudinal section of described falling-resistant ring is at right angles trapezoidal, the junction arc transition of the outer ring surface of falling-resistant ring and inner ring surface, the inclined-plane, oblique waist place of falling-resistant ring is parallel to the rising ramp 41 in anti-avulsion chamber；Being provided with O-ring seal 11 in closed chamber, described O-ring seal is stepped sealing ring, and the stepped falling ramp 62 of the outer ring surface of O-ring seal and annular seal space matches.
In actually used, when pushing tow ductile iron pipe bears traction force, referring to Fig. 2, it is shown that traction force direction to the right, under traction force effect, the bellmouth 2 of the pushing tow ductile iron pipe being positioned at right side moves to right, owing to anti-avulsion chamber 4 is wedge structure, falling-resistant ring 10 is stuck, and falling-resistant ring 10 pushes against weld-ring 7 simultaneously, pulling force suffered by bellmouth 2 is delivered on the socket 3 of next length of tubing by weld-ring 7, thus realizing traction force transmission；When pushing tow ductile iron pipe bears jacking force, referring to Fig. 3, shown jacking force direction is to the right, under jacking force effect, the socket 3 of the pushing tow ductile iron pipe being positioned at left side moves to right, and falling-resistant ring 10 and weld-ring 7 move to right, when weld-ring 7 contacts with weld-ring contacting surface 5, load boss 8 and bellmouth 2 end face also contact with each other, and the jacking force on socket 3 is delivered on the bellmouth 2 of next length of tubing by load boss 8, thus realizing the transmission of jacking force.
Claims (9)
1. a pushing tow ductile iron pipe, at least include the bellmouth and the socket that match, it is characterized in that: the inner surface of described bellmouth is provided with anti-avulsion chamber, weld-ring contacting surface and annular seal space, anti-avulsion chamber, weld-ring contacting surface and annular seal space are axially distributed from bellmouth to socket order along pushing tow ductile iron pipe；The longitudinal section in described anti-avulsion chamber is wedge shaped, and including rising ramp and anti-avulsion vertical plane, weld-ring contacting surface is positioned at the end of anti-avulsion vertical plane；Described annular seal space includes the spacing vertical plane being linked in sequence, stepped falling ramp and pushing tow vertical plane；The outer surface of described socket is provided with weld-ring and load boss, weld-ring and load boss are axially distributed from socket to bellmouth order along pushing tow ductile iron pipe, load boss is equal to bellmouth end face distance to weld-ring contacting surface with weld-ring near the distance of the end face of socket near the end face of socket, and load boss is equal to the bellmouth end face distance to pushing tow vertical plane near the end face of socket with the distance of socket end face.
2. pushing tow ductile iron pipe according to claim 1, it is characterised in that: the middle part of described stepped falling ramp is provided with spacing preiection.
3. pushing tow ductile iron pipe according to claim 1, it is characterised in that: the longitudinal section of described load boss is at right angles trapezoidal, and the right angle waist of right-angled trapezium is positioned at load boss on the end face of socket.
4. pushing tow ductile iron pipe according to claim 1, it is characterised in that: load boss and socket are the integral structure of casting, and weld-ring is fixedly welded on socket outer surface.
5. pushing tow ductile iron pipe according to claim 1, it is characterised in that: the diameter of load boss is identical with the external diameter of bellmouth end face.
6. pushing tow ductile iron pipe according to claim 1, it is characterised in that: the equal arc transition in junction of the junction of rising ramp and the junction of anti-avulsion vertical plane, weld-ring contacting surface and anti-avulsion vertical plane and stepped falling ramp and pushing tow vertical plane.
7. the pipe connecting structure of pushing tow ductile iron pipe described in claim 1, it is characterized in that: the socket of located anteriorly pushing tow ductile iron pipe is embedded in the bellmouth of the pushing tow ductile iron pipe being arranged in its rear, anti-avulsion chamber and the annular seal space of the outer surface closing bellmouth of socket constitute anti-avulsion room and closed chamber, anti-avulsion is provided with falling-resistant ring in room, the longitudinal section of described falling-resistant ring is at right angles trapezoidal, and the inclined-plane, oblique waist place of falling-resistant ring is parallel to the rising ramp in anti-avulsion chamber；Being provided with O-ring seal in closed chamber, described O-ring seal is stepped sealing ring, and the stepped falling ramp of the outer ring surface of O-ring seal and annular seal space matches.
8. pipe connecting structure according to claim 7, it is characterised in that: bellmouth and the outer surface of spigot connection are enclosed with gum elastic set.
9. pipe connecting structure according to claim 7, it is characterised in that: the junction arc transition of the outer ring surface of described falling-resistant ring and inner ring surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610265628.3A CN105715878B (en) | 2016-04-26 | 2016-04-26 | A kind of pushing tow ductile iron pipe and its pipe connecting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610265628.3A CN105715878B (en) | 2016-04-26 | 2016-04-26 | A kind of pushing tow ductile iron pipe and its pipe connecting structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105715878A true CN105715878A (en) | 2016-06-29 |
| CN105715878B CN105715878B (en) | 2018-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610265628.3A Expired - Fee Related CN105715878B (en) | 2016-04-26 | 2016-04-26 | A kind of pushing tow ductile iron pipe and its pipe connecting structure |
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| Country | Link |
|---|---|
| CN (1) | CN105715878B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107830252A (en) * | 2017-12-14 | 2018-03-23 | 江苏欧泰机械有限公司 | A kind of fixing structure for ductile iron pipeline |
| CN108302283A (en) * | 2018-04-03 | 2018-07-20 | 中北大学 | For explosion-and-knock resistant protective device outside bright paving circular pipe |
| CN110131500A (en) * | 2019-05-18 | 2019-08-16 | 江苏狼博管道制造有限公司 | A kind of anti-loose interface of hard locking of socket joint rubber sealing |
| RU2703880C1 (en) * | 2019-03-28 | 2019-10-22 | Валерий Иванович Паутов | Field collapsible pipeline |
| CN113048300A (en) * | 2021-03-11 | 2021-06-29 | 正中路桥建设发展有限公司 | Self-anchored joint nodular cast iron pipe and laying method thereof |
| CN116753360A (en) * | 2023-08-11 | 2023-09-15 | 江苏日升电力机械有限公司 | Connecting device for top pipe of spheroidal graphite cast iron pipe |
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| CN201561209U (en) * | 2009-12-17 | 2010-08-25 | 新兴铸管股份有限公司 | Connector structure of ductile cast iron pipe |
| CN104344112A (en) * | 2014-10-17 | 2015-02-11 | 山东球墨铸铁管有限公司 | Anchoring connector of ductile cast iron pipe |
| CN204164544U (en) * | 2014-10-29 | 2015-02-18 | 山东球墨铸铁管有限公司 | A kind of ductile iron pipe slip-preventing structure |
| CN204785312U (en) * | 2015-07-13 | 2015-11-18 | 中国神华能源股份有限公司 | Well water pipeling and normal water conveying system |
| CN205118438U (en) * | 2015-10-29 | 2016-03-30 | 吕梁学院 | Nodular cast iron top tube |
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2016
- 2016-04-26 CN CN201610265628.3A patent/CN105715878B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201561209U (en) * | 2009-12-17 | 2010-08-25 | 新兴铸管股份有限公司 | Connector structure of ductile cast iron pipe |
| CN104344112A (en) * | 2014-10-17 | 2015-02-11 | 山东球墨铸铁管有限公司 | Anchoring connector of ductile cast iron pipe |
| CN204164544U (en) * | 2014-10-29 | 2015-02-18 | 山东球墨铸铁管有限公司 | A kind of ductile iron pipe slip-preventing structure |
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| CN205118438U (en) * | 2015-10-29 | 2016-03-30 | 吕梁学院 | Nodular cast iron top tube |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107830252A (en) * | 2017-12-14 | 2018-03-23 | 江苏欧泰机械有限公司 | A kind of fixing structure for ductile iron pipeline |
| CN108302283A (en) * | 2018-04-03 | 2018-07-20 | 中北大学 | For explosion-and-knock resistant protective device outside bright paving circular pipe |
| CN108302283B (en) * | 2018-04-03 | 2024-01-05 | 中北大学 | External antiknock and impact-resistant protection device for exposed circular pipeline |
| RU2703880C1 (en) * | 2019-03-28 | 2019-10-22 | Валерий Иванович Паутов | Field collapsible pipeline |
| CN110131500A (en) * | 2019-05-18 | 2019-08-16 | 江苏狼博管道制造有限公司 | A kind of anti-loose interface of hard locking of socket joint rubber sealing |
| CN113048300A (en) * | 2021-03-11 | 2021-06-29 | 正中路桥建设发展有限公司 | Self-anchored joint nodular cast iron pipe and laying method thereof |
| CN116753360A (en) * | 2023-08-11 | 2023-09-15 | 江苏日升电力机械有限公司 | Connecting device for top pipe of spheroidal graphite cast iron pipe |
| CN116753360B (en) * | 2023-08-11 | 2023-10-20 | 江苏日升电力机械有限公司 | Connecting device for top pipe of spheroidal graphite cast iron pipe |
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| Publication number | Publication date |
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| CN105715878B (en) | 2018-02-16 |
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