CN112032418A - Prestressed steel cylinder concrete pipe - Google Patents
Prestressed steel cylinder concrete pipe Download PDFInfo
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- CN112032418A CN112032418A CN202010895043.6A CN202010895043A CN112032418A CN 112032418 A CN112032418 A CN 112032418A CN 202010895043 A CN202010895043 A CN 202010895043A CN 112032418 A CN112032418 A CN 112032418A
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- steel
- ring
- bellmouth
- socket
- cylinder main
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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
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/153—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and concrete with or without reinforcement
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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
- 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
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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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention discloses a prestressed steel cylinder concrete pipe which comprises a steel cylinder main body, wherein a protective inner layer is poured inside the steel cylinder main body, a prestressed high-strength steel wire is wound on the outer surface of the steel cylinder main body in the circumferential direction, the outer edges of the prestressed high-strength steel wires are in contact with each other, the protective outer layer is poured on the outer surface of the steel cylinder main body, the prestressed high-strength steel wire is located in the protective outer layer, two connecting grooves are formed in two ends of the outer surface of the steel cylinder main body, a socket steel ring and a socket steel ring are welded in the two connecting grooves respectively, and two sealing ring main bodies are clamped on the outer surface of the socket steel ring. The prestressed concrete cylinder pipe has stable structural performance, improves the compressive strength, the permeability resistance of the pipe body, the sealing performance of a joint and the foundation settlement resistance and the earthquake resistance of a pipeline, can be used as a water diversion pipeline and an urban pipe gallery, has various functions, and achieves an effective result by using the lowest economic cost.
Description
Technical Field
The invention relates to the technical field of prestressed steel cylinder concrete pipes, in particular to a prestressed steel cylinder concrete pipe.
Background
The prestressed steel cylinder concrete pipe is a water pipe made by winding circumferential prestressed steel wires on a high-strength concrete pipe core with a steel cylinder and spraying a compact cement mortar protective layer on the prestressed steel cylinder concrete pipe.
The existing prestressed steel cylinder concrete pipe has low impact resistance and bearing capacity, is easy to damage and has high cost in the using process. Therefore, we provide a prestressed concrete cylinder pipe.
Disclosure of Invention
The invention mainly aims to provide a prestressed concrete cylinder pipe which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a prestressed steel cylinder concrete pipe, includes the steel cylinder main part, the inside of steel cylinder main part is pour and is protected the inlayer, the surface hoop winding of steel cylinder main part has a prestressing force high strength steel wire, the outer fringe of prestressing force high strength steel wire contacts each other, the protection skin has been pour to the surface of steel cylinder main part, and the prestressing force high strength steel wire is located the protection skin in, a spread groove has all been opened at the surface both ends of steel cylinder main part, and has welded socket steel ring and bellmouth steel ring in two spread grooves respectively, the surface joint of socket steel ring has two sealing washer main parts.
Preferably, a connector is arranged at one end, close to the steel cylinder main body, of the socket steel ring, the connector is matched with the connecting groove in structure, the connector is sleeved on the connecting groove and is used for welding the socket steel ring and the steel cylinder main body together, and two sealing ring connecting grooves are formed in the outer surface of the connector.
Preferably, the inside size of sealing washer main part and the size looks adaptation of sealing washer spread groove, two the sealing washer main part passes through the sealing washer spread groove and cup joints sealing washer main part and socket steel ring fixed connection in the outside of socket steel ring.
Preferably, the bellmouth steel ring comprises a bellmouth steel ring wall, a bellmouth steel ring first area and a bellmouth steel ring second area, the bellmouth steel ring first area is outwards opened at an angle of 22 degrees relative to the bellmouth steel ring wall, the bellmouth steel ring second area is inwards folded at an angle of 26 degrees relative to the bellmouth steel ring wall, a connecting ring is integrally formed at one end, far away from the bellmouth steel ring wall, of the bellmouth steel ring first area, and the connecting ring is fixedly welded with the steel cylinder main body through the connecting groove.
Preferably, the inner surface of the bellmouth steel ring wall is provided with two sealing ring clamping grooves, and the positions of the sealing ring clamping grooves are matched with the structure of the sealing ring main body and correspond to the positions of the sealing ring main body.
Preferably, the external structure of socket steel ring and the inner structure looks adaptation of bellmouth steel ring, the sealing washer main part joint is in the sealing washer draw-in groove with socket steel ring and bellmouth steel ring joint together.
Preferably, the preparation process comprises the following steps:
s1: rolling the socket steel plate: shearing the fixed-length bellmouth steel plate and the fixed-length spigot steel plate, preliminarily rolling the fixed-length bellmouth steel plate and the fixed-length spigot steel plate on a rolling machine, and welding a joint seam;
s2: preparing and molding the socket steel ring and the socket steel ring: hanging the preliminary curled bellmouth ring on a compression roller of an edging mill, edging the bellmouth through an expanding agent, assembling and spot-welding the bellmouth ring and the socket ring after being expanded to required sizes on a bell and spigot assembling table, expanding the socket of the preliminary curled circle and the bellmouth of the edging mill to required sizes to finally obtain a socket steel ring and a bellmouth steel ring, wherein two sealing ring connecting grooves are formed in the outer part of the socket steel ring, and two sealing ring clamping grooves are formed in the inner part of the bellmouth steel ring wall;
s3: spiral coil welding of a steel cylinder: taking a thin steel plate with the thickness of 1.5mm as a raw material, placing the thin steel plate on a rolling machine for primary rolling, and then placing the thin steel plate on a ring welding machine for spiral roll welding to obtain a steel cylinder main body;
s4: water pressure inspection: and testing the obtained steel cylinder main body on a steel cylinder hydraulic press for the required water pressure.
S5: preparing concrete: according to the design requirement of the mixing proportion, metering the concrete, adding water and stirring uniformly;
s6: pouring for one time: pouring a layer of protective inner layer in the steel cylinder main body by the mixed concrete of S5, and compounding the steel cylinder main body and the protective inner layer into a pipe core;
s7: socket and spigot connection: arranging connecting grooves at two ends of a steel cylinder main body qualified in a test, respectively and annularly welding the prepared socket steel ring and the bell mouth steel ring at two ends of the steel cylinder main body through the connecting grooves, and clamping the two sealing ring main bodies in the corresponding sealing ring connecting grooves;
s8: and (3) winding the circumferential steel wire: installing the steel cylinder main body on a blocking disc of a wire winding machine, and winding prestress high-strength steel wires outside the steel cylinder main body in an annular mode;
s9: secondary pouring; performing secondary pouring of a protective outer layer on the mixed concrete of the S5 outside the steel cylinder main body, and compounding the prestressed high-strength steel wire and the protective outer layer into a pipe body;
s10: maintenance and inspection: and (4) performing steam curing and water curing on the protective outer layer, uniformly spraying an anticorrosive material on the bell and spigot steel ring, inspecting the product, and obtaining the qualified product as a final finished product.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the prestressed steel cylinder concrete pipe, the protective inner layer is poured inside the steel cylinder main body, the protective outer layer is poured outside the steel cylinder main body, the prestressed steel cylinder concrete pipe is stable in structural performance, the prestressed high-strength steel wires are wound on the outer portion of the steel cylinder main body in the circumferential direction, the outer edges of the prestressed high-strength steel wires are in contact with each other, and the compressive strength is high.
2. According to the invention, the inner protective layer and the outer protective layer are both formed by pouring concrete, so that the impermeability of the pipe body is improved, the spigot steel ring and the socket steel ring are fixedly welded at two ends of the steel cylinder main body, the double-groove double-rubber-ring sealing interface is adopted, so that the sealing performance of the joint is improved, and the foundation settlement resistance and the earthquake resistance of the pipeline can be used as a water diversion pipeline or an urban pipe gallery, so that the product is multifunctional.
3. The prestressed steel cylinder concrete pipe provided by the invention is simple in preparation method, has the performances of compactness, water resistance, good leakage resistance, high strength and the like, is strong in bearing capacity and high in impact strength, and achieves an effective result by utilizing the lowest economic cost.
Drawings
FIG. 1 is an overall structural view of a prestressed concrete cylinder pipe according to the present invention;
FIG. 2 is a schematic view showing the connection relationship of a prestressed concrete cylinder pipe according to the present invention;
FIG. 3 is an internal structural view of a prestressed concrete cylinder pipe according to the present invention;
FIG. 4 is a schematic structural diagram of a steel ring for a socket of a prestressed concrete cylinder pipe according to the present invention;
fig. 5 is a schematic view of the internal structure of a bell end steel ring of a prestressed concrete cylinder pipe according to the present invention.
In the figure: 1. a steel cylinder body; 2. a protective inner layer; 3. prestressed high-strength steel wires; 4. a protective outer layer; 5. connecting grooves; 6. a socket steel ring; 7. a seal ring main body; 8. a socket steel ring; 61. a connecting port; 62. a sealing ring connecting groove; 81. a bellmouth steel annular wall; 82. a first bellmouth steel ring area; 83. a second bellmouth steel ring area; 84. a connecting ring; 85. and a sealing ring clamping groove.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1-5, a prestressed steel cylinder concrete pipe, including steel cylinder main part 1, protective inner layer 2 has been pour to the inside of steel cylinder main part 1, the winding of the surface hoop of steel cylinder main part 1 has a prestressing force high-strength steel wire 3, the outer fringe of prestressing force high-strength steel wire 3 contacts each other, protective outer layer 4 has been pour to the surface of steel cylinder main part 1, and prestressing force high-strength steel wire 3 is located protective outer layer 4, a spread groove 5 has all been opened at the surface both ends of steel cylinder main part 1, and it has socket steel ring 6 and bellmouth steel ring 8 to weld respectively in two spread grooves 5, the surface joint of socket steel ring 6 has two sealing washer main parts 7.
One end of the steel ring 6 close to the steel cylinder body 1 is provided with a connector 61, the connector 61 is matched with the structure of the connecting groove 5, the connector 61 is sleeved on the connecting groove 5 and is used for welding the steel ring 6 with the steel cylinder body 1, and the outer surface of the connector 61 is provided with two sealing ring connecting grooves 62.
The inside size of sealing washer main part 7 and the size looks adaptation of sealing washer spread groove 62, two sealing washer main parts 7 cup joint sealing washer main part 7 and socket steel ring 6 fixed connection in the outside of socket steel ring 6 through sealing washer spread groove 62.
The bellmouth steel ring 8 comprises a bellmouth steel ring wall 81, a bellmouth steel ring first area 82 and a bellmouth steel ring second area 83, wherein the bellmouth steel ring first area 82 is outwards opened at an angle of 22 degrees relative to the bellmouth steel ring wall 81, the bellmouth steel ring second area 83 is inwards closed at an angle of 26 degrees relative to the bellmouth steel ring wall 81, one end, far away from the bellmouth steel ring wall 81, of the bellmouth steel ring first area 82 is integrally formed with a connecting ring 84, and the connecting ring 84 is fixedly welded with the steel cylinder main body 1 through a connecting groove 5.
Two sealing ring clamping grooves 85 are formed in the inner surface of the socket steel ring wall 81, and the positions of the sealing ring clamping grooves 85 are matched with the structure of the sealing ring main body 7 and correspond to the positions of the sealing ring main body.
The external structure of the socket steel ring 6 is matched with the internal structure of the bell mouth steel ring 8, and the sealing ring main body 7 is clamped in the sealing ring clamping groove 85 to clamp the socket steel ring 6 and the bell mouth steel ring 8 together.
The preparation process comprises the following steps:
s1: rolling the socket steel plate: shearing the fixed-length bellmouth steel plate and the fixed-length spigot steel plate, preliminarily rolling the fixed-length bellmouth steel plate and the fixed-length spigot steel plate on a rolling machine, and welding a joint seam;
s2: preparing and forming the socket steel ring 6 and the socket steel ring 8: hanging the preliminary curled bellmouth ring on a compression roller of an edging mill, edging the bellmouth through an expanding agent, assembling and spot-welding the bellmouth ring and the socket ring after the ring expansion on a bell and spigot assembling table, expanding the spigot of the preliminary curled ring and the bellmouth of the edging mill to the required size on the edging mill, finally obtaining a spigot steel ring 6 and a bellmouth steel ring 8, wherein two sealing ring connecting grooves 62 are formed in the outer part of the spigot steel ring 6, and two sealing ring clamping grooves 85 are formed in the inner part of a bellmouth steel ring wall 81;
s3: spiral coil welding of a steel cylinder: taking a thin steel plate with the thickness of 1.5mm as a raw material, placing the thin steel plate on a rolling machine for primary rolling, and then placing the thin steel plate on a ring welding machine for spiral roll welding to obtain a steel cylinder main body 1;
s4: water pressure inspection: and testing the required water pressure of the obtained steel cylinder main body 1 on a steel cylinder hydraulic press.
S5: preparing concrete: according to the design requirement of the mixing proportion, metering the concrete, adding water and stirring uniformly;
s6: pouring for one time: pouring a layer of protective inner layer 2 in the steel cylinder main body 1 by the mixed concrete of S5, and compounding the steel cylinder main body 1 and the protective inner layer 2 into a pipe core;
s7: socket and spigot connection: connecting grooves 5 are formed in two ends of a steel cylinder main body 1 qualified in a test, a prepared socket steel ring 6 and a prepared bellmouth steel ring 8 are respectively welded to two ends of the steel cylinder main body 1 in an annular mode through the connecting grooves 5, and two sealing ring main bodies 7 are clamped in corresponding sealing ring connecting grooves 62;
s8: and (3) winding the circumferential steel wire: installing a steel cylinder main body 1 on a blocking disc of a wire winding machine, and winding a prestressed high-strength steel wire 3 in the circumferential direction outside the steel cylinder main body 1;
s9: secondary pouring; secondly pouring a layer of protective outer layer 4 on the outside of the steel cylinder main body 1 by the mixed concrete of S5, and compounding the prestressed high-strength steel wire 3 and the protective outer layer 4 into a pipe body;
s10: maintenance and inspection: and (3) carrying out steam curing and water curing on the protective outer layer 4, uniformly spraying an anticorrosive material on the bell and spigot steel ring, inspecting the product, and obtaining the qualified product as a final finished product.
The prestressed steel cylinder concrete pipe has the advantages that the protective inner layer 2 is poured inside the steel cylinder main body 1, the protective outer layer 4 is poured outside the steel cylinder main body 1, the prestressed steel cylinder concrete pipe is stable in structural performance, the prestressed high-strength steel wires 3 are wound annularly outside the steel cylinder main body 1, the outer edges of the prestressed high-strength steel wires 3 are in contact with each other, the compressive strength is high, the socket steel rings 6 and the socket steel rings 8 are fixedly welded to the two ends of the steel cylinder main body 1, the sealing performance of the joint is improved by adopting the double-groove double-rubber-ring sealing interface, the pipe can be used as a water diversion pipeline, can also be used as an urban pipe gallery, and the multiple functions of the product are achieved.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides a prestressing force steel cylinder concrete pipe, includes steel cylinder main part (1), its characterized in that: the inside casting of steel cylinder main part (1) has protection inlayer (2), the surface hoop winding of steel cylinder main part (1) has one prestressing force high-strength steel wire (3), the outer fringe of prestressing force high-strength steel wire (3) contacts each other, the surface of steel cylinder main part (1) is pour and is protected outer (4), and prestressing force high-strength steel wire (3) are located and protect outer (4), a spread groove (5) have all been opened at the surface both ends of steel cylinder main part (1), and have socket steel ring (6) and bellmouth steel ring (8) in two spread grooves (5) respectively the welding, the surface joint of socket steel ring (6) has two sealing washer main parts (7).
2. The prestressed reinforced concrete cylinder pipe of claim 1, wherein: one end that socket steel ring (6) are close to steel cylinder main part (1) is opened there is connector (61), the structure looks adaptation of connector (61) and spread groove (5), connector (61) cup joint on spread groove (5) and with socket steel ring (6) and steel cylinder main part (1) welding together, the surface of connector (61) is opened there are two sealing washer spread grooves (62).
3. The prestressed reinforced concrete cylinder pipe of claim 1, wherein: the inside dimension of sealing washer main part (7) and the size looks adaptation of sealing washer spread groove (62), two sealing washer main part (7) cup joint sealing washer main part (7) and socket steel ring (6) fixed connection in the outside of socket steel ring (6) through sealing washer spread groove (62).
4. The prestressed reinforced concrete cylinder pipe of claim 1, wherein: bellmouth steel ring (8) are including bellmouth steel rampart (81), bellmouth steel ring district (82) and bellmouth steel ring second district (83), bellmouth steel ring first district (82) are 22 angles for bellmouth steel rampart (81) and outwards open, and bellmouth steel ring second district (83) are 26 angles for bellmouth steel rampart (81) and inwards draw in, bellmouth steel ring first district (82) keep away from the one end integrated into one piece of bellmouth steel rampart (81) and have a go-between (84), go-between (84) are through spread groove (5) and steel cylinder main part (1) fixed weld.
5. The prestressed reinforced concrete cylinder pipe of claim 1, wherein: the inner surface of the socket steel ring wall (81) is provided with two sealing ring clamping grooves (85), and the positions of the sealing ring clamping grooves (85) are matched with the structure of the sealing ring main body (7) and correspond to the positions of the sealing ring clamping grooves.
6. The prestressed reinforced concrete cylinder pipe of claim 1, wherein: the outer structure of socket steel ring (6) and the inner structure looks adaptation of bellmouth steel ring (8), sealing washer main part (7) joint is in the same place socket steel ring (6) and bellmouth steel ring (8) joint in sealing washer draw-in groove (85).
7. The prestressed concrete cylinder pipe as claimed in claims 1-6, wherein: the preparation process comprises the following steps:
s1: rolling the socket steel plate: shearing the fixed-length bellmouth steel plate and the fixed-length spigot steel plate, preliminarily rolling the fixed-length bellmouth steel plate and the fixed-length spigot steel plate on a rolling machine, and welding a joint seam;
s2: preparing and molding the socket steel ring (6) and the socket steel ring (8): hanging the preliminary curled bellmouth ring on a compression roller of an edging machine, edging the bellmouth through an expanding agent, assembling and spot-welding the bellmouth ring and the socket ring after being expanded to required sizes on a bell and spigot assembly table, expanding the socket of the preliminary curled circle and the bellmouth of the edging on the edging machine to obtain a socket steel ring (6) and a bellmouth steel ring (8) finally, wherein two sealing ring connecting grooves (62) are formed in the outer part of the socket steel ring (6), and two sealing ring clamping grooves (85) are formed in the inner part of a bellmouth steel ring wall (81);
s3: spiral coil welding of a steel cylinder: taking a thin steel plate with the thickness of 1.5mm as a raw material, placing the thin steel plate on a rolling machine for primary rolling, and then placing the thin steel plate on a ring welding machine for spiral rolling welding to obtain a steel cylinder main body (1);
s4: water pressure inspection: and testing the required water pressure of the obtained steel cylinder main body (1) on a steel cylinder hydraulic press.
S5: preparing concrete: according to the design requirement of the mixing proportion, metering the concrete, adding water and stirring uniformly;
s6: pouring for one time: pouring a layer of protective inner layer (2) in the steel cylinder main body (1) by the mixed concrete of S5, and compounding the steel cylinder main body (1) and the protective inner layer (2) into a pipe core;
s7: socket and spigot connection: connecting grooves (5) are formed in two ends of a steel cylinder main body (1) qualified in a test, a prepared socket steel ring (6) and a prepared bellmouth steel ring (8) are respectively welded to two ends of the steel cylinder main body (1) in an annular mode through the connecting grooves (5), and two sealing ring main bodies (7) are clamped in corresponding sealing ring connecting grooves (62);
s8: and (3) winding the circumferential steel wire: installing a steel cylinder main body (1) on a blocking disc of a wire winding machine, and winding a prestress high-strength steel wire (3) outside the steel cylinder main body (1) in an annular manner;
s9: secondary pouring; secondly pouring a layer of protective outer layer (4) on the outside of the steel cylinder main body (1) by the mixed concrete of S5, and compounding the prestressed high-strength steel wire (3) and the protective outer layer (4) into a pipe body;
s10: maintenance and inspection: and (3) performing steam curing and water curing on the protective outer layer (4), uniformly spraying an anticorrosive material on the bell and spigot steel ring, inspecting the product, and obtaining the qualified product as a final finished product.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010895043.6A CN112032418B (en) | 2020-08-31 | 2020-08-31 | Prestressed steel cylinder concrete pipe |
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|---|---|---|---|
| CN202010895043.6A CN112032418B (en) | 2020-08-31 | 2020-08-31 | Prestressed steel cylinder concrete pipe |
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| CN112032418B CN112032418B (en) | 2022-04-22 |
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Cited By (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115059807A (en) * | 2022-06-30 | 2022-09-16 | 安钢集团永通球墨铸铁管有限责任公司 | Short-length micro jacking pipe and manufacturing process thereof |
| CN115059807B (en) * | 2022-06-30 | 2024-02-13 | 安钢集团永通球墨铸铁管有限责任公司 | Short-length micro-jacking pipe and manufacturing process thereof |
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| Publication number | Publication date |
|---|---|
| CN112032418B (en) | 2022-04-22 |
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Effective date of registration: 20221229 Address after: 321025 No.58 Guangxing Road, Wucheng District, Jinhua City, Zhejiang Province Patentee after: ZHEJIANG JULONG PIPES TECHNOLOGY CO.,LTD. Address before: 321025 Hujia village, bailongqiao Town, Wucheng District, Jinhua City, Zhejiang Province Patentee before: Jinhua Julong Pipeline Co.,Ltd. |