CN212429966U - Pipe joint connecting structure - Google Patents
Pipe joint connecting structure Download PDFInfo
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- CN212429966U CN212429966U CN202021112392.8U CN202021112392U CN212429966U CN 212429966 U CN212429966 U CN 212429966U CN 202021112392 U CN202021112392 U CN 202021112392U CN 212429966 U CN212429966 U CN 212429966U
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- jacking pipe
- pipe joint
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Abstract
The utility model provides a pipe joint connecting structure, which comprises a horizontally arranged steel jacking pipe, wherein the top of the steel jacking pipe is provided with an opening; the jacking pipe comprises a first jacking pipe section and a second jacking pipe section which are vertically arranged, wherein the first jacking pipe section is positioned above the second jacking pipe section, part of the first jacking pipe section extends out of the opening, and the second jacking pipe section is positioned in the opening; coupling assembling, including connecting piece and a plurality of connecting pin, the one end of connecting piece and the inner wall contact of first jacking pipe coupling, the other end and the interior wall connection of second jacking pipe coupling, the bottom of first jacking pipe coupling is provided with a plurality of connecting holes, the position department that corresponds with the connecting hole on the connecting piece is provided with the spread groove, the spread groove is extended to in the connecting piece by the outer wall of connecting piece, a plurality of connecting pins are gone into in the spread groove that corresponds in order to connect first jacking pipe coupling and second jacking pipe coupling after running through different connecting holes respectively. The adjacent jacking pipe sections are connected in a bolt mode, so that the problems of difficult construction, long consumed time, poor safety and the like caused by welding construction are solved.
Description
Technical Field
The utility model relates to a push pipe construction technical field especially relates to a pipe joint connection structure.
Background
With the further improvement of the national requirements for environmental protection, industrial wastewater and urban domestic sewage in coastal regions need to be discharged in deep sea, and the sewage discharge effect of long-distance pipelines is increasingly obvious. The conventional underwater pipe burying excavation process is adopted to lay the sewage pipeline, and the defects of high manufacturing cost, large pollution and large environmental influence are overcome; and the steel pipe jacking process and the vertical jacking process are adopted, so that the damage to the environment can be effectively reduced, and meanwhile, the construction cost is lower compared with that of an underwater pipe burying process. The steel pipe jacking process is that the steel pipe jacking is jacked into the soil according to a designed gradient by overcoming the friction force between a pipeline and the surrounding soil in a working pit by means of jacking force generated by jacking equipment. The vertical jacking process is that vertical jacking equipment is utilized to jack up a plurality of jacking pipe sections in the horizontal steel jacking pipe section by section, and the adjacent jacking pipe sections are connected and the jacking pipe sections are exposed out of the mud surface of the seabed to the designed elevation.
At present, the connection is often carried out through the welding between the adjacent jacking pipe joints, but, to seabed long distance and the narrow and small adverse circumstances in space, welded connection between the jacking pipe joints has the construction degree of difficulty big, and is efficient, long consuming time and shortcoming such as safe risk height.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a pipe coupling connection structure, the construction difficulty that the solution welding construction brought, consuming time long and the security subalternation problem.
In order to achieve the above object, the utility model provides a pipe coupling connection structure, include:
the steel jacking pipe is horizontally arranged, and the top of the steel jacking pipe is provided with an opening;
the jacking pipe comprises a first jacking pipe joint and a second jacking pipe joint which are vertically arranged, wherein the first jacking pipe joint is positioned above the second jacking pipe joint, part of the first jacking pipe joint extends out of the hole, and the second jacking pipe joint is positioned in the hole;
coupling assembling, including connecting piece and a plurality of connecting pin, the one end of connecting piece with the inner wall contact of first jacking pipe coupling, the other end with the interior wall connection of second jacking pipe coupling, the bottom of first jacking pipe coupling is provided with a plurality of connecting holes, on the connecting piece with the position department that the connecting hole corresponds is provided with the spread groove, the spread groove by the outer wall of connecting piece extends to in the connecting piece, it is a plurality of the connecting pin runs through the difference respectively the card is gone into behind the connecting hole and is corresponded in order to connect in the spread groove first jacking pipe coupling reaches second jacking pipe coupling.
Optionally, the connecting piece is annular, and a plurality of connecting grooves are uniformly distributed along the circumferential direction of the connecting piece.
Optionally, the connecting piece includes a plurality of bar-shaped blocks, each bar-shaped block is provided with the connecting groove, and the plurality of bar-shaped blocks are uniformly distributed along the circumferential direction of the second jacking pipe section.
Optionally, one end of the connecting pin is clamped into the connecting groove, and the other end of the connecting pin is flush with the outer wall of the first jacking pipe section.
Optionally, a plurality of sealing rings are further arranged between the connecting piece and the inner wall of the first jacking pipe joint.
Optionally, pipe coupling connection structure still includes the stagnant water subassembly, the stagnant water subassembly includes steel overcoat and stagnant water spare, the steel overcoat sets up in the entrance to a cave, stagnant water spare is located the inboard and the cover of steel overcoat are established outside first jacking pipe coupling, stagnant water spare includes along pre-buried ring and the steel clamping ring of vertical direction setting, pre-buried ring is located the top of steel clamping ring, pre-buried ring is close to one side of first jacking pipe coupling is provided with annular first stagnant water groove, be provided with annular second stagnant water groove on the steel clamping ring, pre-buried ring with be provided with annular third stagnant water groove between the steel clamping ring, just first stagnant water inslot has held first stagnant water piece, the second stagnant water groove reaches the third stagnant water inslot has all held the second stagnant water piece.
Optionally, the cross-sectional shapes of the first water stop block and the second water stop block along the vertical direction are respectively wedge-shaped and circular.
Optionally, tube coupling connection structure still including be used for right first jacking tube coupling carries out the interim stopping subassembly of stopping, tube coupling connection structure still including being used for right first jacking tube coupling carries out the interim stopping subassembly of stopping, interim stopping subassembly is including stopping ring and a plurality of fastener, stopping ring cover is established outside first jacking tube coupling and be located the below of steel clamping ring, the lateral wall of stopping ring is provided with a plurality of stopping holes along circumference, be provided with a plurality of slots on the outer wall of first jacking tube coupling, it is a plurality of the fastener runs through respectively stretch into behind the stopping hole and correspond in the slot.
Optionally, the retaining hole and the slot have internal threads with the same screwing direction, the fastener is a bolt, and the bolt is in threaded connection with the retaining hole and the slot.
Optionally, the fastening member is a bolt, and the bolt penetrates through the stopping hole and then extends into the corresponding slot.
The utility model provides a pipe coupling connection structure, through set up the connecting piece in second jacking pipe coupling, and be in the position department that connecting piece and first jacking pipe coupling correspond sets up connecting hole and spread groove respectively, utilizes the connecting pin to run through behind the different connecting holes card income to connect corresponding spread groove, has avoided the construction difficulty that welding construction brought, length consuming time and the poor scheduling problem of security, just the connecting piece can be connected with second jacking pipe coupling in advance, on-the-spot direct mount can, easy operation and swift.
Drawings
Fig. 1 is a schematic view of a pipe joint connection structure according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a partially enlarged view of a pipe joint connection structure according to an embodiment of the present invention;
wherein the reference numerals are:
10-steel jacking pipes; 21-a first jacking pipe section; 22-a second jacking pipe section; 31-a connector; 32-connecting pins; 40-water stop blank board; 50-neoprene seal ring; 61-steel jacket; 62-embedding rings; 63-a steel pressure ring; 71-a first water stop block; 72-a second water stop block; 81-check ring; 82-a fastener;
610-stiffener.
Detailed Description
The following description of the embodiments of the present invention will be described in more detail with reference to the drawings. Advantages and features of the present invention will become apparent from the following description and claims. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.
As shown in fig. 1, the present embodiment provides a pipe joint connection structure, including:
the steel jacking pipe 10 is horizontally arranged, and the top of the steel jacking pipe 10 is provided with an opening;
the jacking pipe comprises a first jacking pipe joint 21 and a second jacking pipe joint 22 which are vertically arranged, wherein the first jacking pipe joint 21 is positioned above the second jacking pipe joint 22, part of the first jacking pipe joint 21 extends out of the hole, and the second jacking pipe joint 22 is positioned in the hole;
coupling assembling, including connecting piece 31 and a plurality of connecting pin 32, the one end of connecting piece 31 with the inner wall contact of first jacking pipe coupling 21, the other end with the interior wall connection of second jacking pipe coupling 22, the bottom of first jacking pipe coupling 21 is provided with a plurality of connecting holes, connecting piece 31 on with the position department that the connecting hole corresponds is provided with the spread groove, the spread groove by the outer wall of connecting piece 31 extends to in the connecting piece 31, it is a plurality of connecting pin 32 runs through the difference respectively the card is gone into behind the connecting hole and is corresponded in the spread groove with connecting first jacking pipe coupling 21 reaches second jacking pipe coupling 22.
Specifically, the horizontally arranged steel jacking pipe 10 is a main drainage pipeline and is constructed and buried through a pipe jacking process. The top of the steel jacking pipe 10 is provided with a hole, and the jacking pipe penetrates through the hole and exposes out of the mud surface of the seabed to a designed elevation. In this embodiment, the hole is circular, the axis of the hole coincides with the axis of the jacking pipe joint, and the axis of the hole is vertically intersected with the axis of the steel jacking pipe 10 to ensure that the jacking steel pipe can be jacked smoothly.
The jacking pipe is formed by stacking a plurality of jacking pipe sections along the vertical direction, the first jacking pipe section 21 can be a jacking pipe section positioned at the uppermost part of the jacking pipe or one of the jacking pipe sections positioned in the middle of the jacking pipe, and the jacking pipe is not limited in this application. In the embodiment, the height of the jacking pipe is 9-10 meters, the jacking pipe is exposed out of the mud surface of the seabed by 1 meter, the length of each jacking pipe joint is 0.8-1 meter, and the jacking pipe joint is made of stainless steel.
First jacking pipe coupling 21 does a section pipe coupling of jacking pipe the top, just first jacking pipe coupling 21's top still is provided with a stagnant water stifled board 40, stagnant water stifled board 40 is used for leading and cutting soil at the jacking in-process. The top of the water stop blank plate 40 cannot be higher than the surface of the horizontal steel jacking pipe 10, so that the influence on the normal jacking of the horizontal steel jacking pipe 10 is avoided. The water stop blank plate 40 is provided with an air vent for discharging air in the jacking pipe joint, so that the construction safety is improved.
In this embodiment, the outer walls of the first jacking pipe joint 21 and the second jacking pipe joint 22 are coated with a sintered epoxy powder anticorrosive coating, and the thickness of the coating is not less than 400 microns. The inner walls of the first jacking pipe joint 21 and the second jacking pipe joint 22 are coated with two anti-corrosion zinc coating layers and two modified epoxy wear-resistant paints. The anti-corrosion coating on the inner wall and the outer wall of the jacking pipe joint can be carried out in a steel pipe processing plant.
With reference to fig. 1 and fig. 2, the connecting assembly is used to connect two adjacent jacking pipe sections. Coupling assembling includes connecting piece 31 and connecting pin 32, the one end of connecting piece 31 with the inner wall contact of first jacking pipe coupling 21, the other end with the inner wall connection of second jacking pipe coupling 22. In this embodiment, the connecting member 31 is annular, and the plurality of connecting grooves are uniformly distributed along the circumferential direction of the connecting member 31. Because be provided with a plurality of spread grooves on the connecting piece 31, the top correspondence of first jacking pipe joint 21 is provided with a plurality of connecting holes, connecting pin 32 runs through go into behind the connecting hole card in order to connect in the spread groove first jacking pipe joint 21 reaches second jacking pipe joint 22. Through converting traditional welded connection's mode into pin joint, simplified the connected mode between the jacking pipe coupling, reduced the connection degree of difficulty, improved the efficiency of construction. In addition, the connecting piece 31 can be connected with the second jacking pipe joint 22 in a factory and directly transported to the site for installation, so that prefabrication and assembly of the pipe joint connecting structure are realized. It will be appreciated that the bottom end of the second jacking pipe section 22 is also provided with a plurality of connection holes for connecting the next jacking pipe section.
Optionally, the connecting member 31 includes a plurality of bar-shaped blocks, each bar-shaped block is provided with the connecting groove, and the plurality of bar-shaped blocks are uniformly distributed along the circumferential direction of the second jacking pipe joint 22. Equivalently, the first jacking pipe joint 21 and the second jacking pipe joint 22 are connected through a plurality of bar-shaped blocks, one ends of the bar-shaped blocks are welded with the inner wall of the second jacking pipe joint 22, the other ends of the bar-shaped blocks are in contact with the inner wall of the first jacking pipe joint 21, and a plurality of connecting pins 32 penetrate through connecting holes in different bar-shaped blocks respectively and then are clamped into corresponding connecting grooves to connect the first jacking pipe joint 21 and the second jacking pipe joint 22.
In this embodiment, one end of the connecting pin is clamped into the connecting groove, and the other end of the connecting pin is flush with the outer wall of the first jacking pipe joint. That is, the length of the connecting pin 32 is equal to the sum of the lengths of the connecting hole and the connecting groove, so that the connecting pin 32 is flush with the outer wall of the first jacking pipe joint 21 after being knocked down, and the jacking of the first jacking pipe joint 21 is prevented from being affected.
In this embodiment, one end of the connecting member 31 is welded to the second jacking pipe section 22, and the welding process can be performed in a factory.
Referring to fig. 2, a plurality of sealing rings are further disposed between one end of the connecting member 31 and the inner wall of the first jacking pipe joint 21 to prevent water from leaking from the connecting hole of the first jacking pipe joint 21. In this embodiment, two circles of neoprene sealing rings 50 are arranged between one end of the connecting member 31 and the inner wall of the first jacking pipe section 21, and neoprene has good corrosion resistance, erosion resistance and heat resistance, so that the neoprene has a longer service life under the condition of ensuring a sealing effect.
With continued reference to fig. 1 and 2, the pipe joint connecting structure further includes a water stopping assembly, the water stopping assembly includes a steel jacket 61 and a water stopping member, the steel jacket 61 is arranged in the opening, the water stop piece is positioned at the inner side of the steel jacket 61 and sleeved outside the first jacking pipe joint 21, the water stop piece comprises an embedded ring 62 and a steel pressure ring 63 which are arranged along the vertical direction, the embedded ring 62 is positioned above the steel pressure ring 63, one side of the embedded ring 62 close to the first jacking pipe joint 21 is provided with an annular first water stop groove, an annular second water-stopping groove is arranged on the steel pressing ring 63, an annular third water-stopping groove is arranged between the embedded ring 62 and the steel pressing ring 63, and a first water stop block 71 is accommodated in the first water stop tank, and a second water stop block 72 is accommodated in the second water stop tank and the third water stop tank. It should be understood that, in order to facilitate the jacking of first jacking pipe joint 21, pre-buried ring 62 with first jacking pipe joint 21 and steel clamping ring 63 with all have certain clearance between the first pipe joint, at the jacking in-process of first jacking pipe joint 21, muddy water outside the entrance to a cave easily passes through in clearance gets into steel push pipe 10, so form three stagnant water structures through setting up first stagnant water piece 71 and two second stagnant water pieces 72, the stagnant water effect is better.
In this embodiment, the steel jacket 61 is annular and is disposed inside the opening, and is used to strengthen the connection with the horizontal steel jacking pipe 10, and reduce the strength and rigidity loss caused by local opening of the horizontal steel jacking pipe 10. Referring to fig. 1, a plurality of stiffening ribs 610 are circumferentially disposed on an outer wall of the steel jacket 61, and the stiffening ribs 610 are used for improving the strength and rigidity of the steel jacket 61.
The embedded ring 62 is used for pressing the first water stop block 71 on the outer wall of the first jacking pipe joint 21, so that the first water stop block 71 is prevented from sliding off in the jacking process of the first jacking pipe joint 21 to influence the sealing performance.
The steel clamping ring 63 is used for pressing the second water stop block 72 tightly on the outer wall of the first jacking pipe joint 21, and is also used for preventing the second water stop block 72 from sliding off the first jacking pipe joint 21 in the jacking process to influence the sealing performance. The two second water stop blocks 72 are provided to prevent effective water stop by the two second water stop blocks 72 when the first water stop block 71 fails.
With reference to fig. 1, the cross-sectional shapes of the first water stop block 71 and the second water stop block 72 along the vertical direction are wedge-shaped and circular, respectively. The water stopping performance of the hole is further improved by arranging the first water stopping block 71 and the second water stopping block 72 with different cross-sectional shapes. In this embodiment, the first water stop block 71 and the second water stop block 72 are made of neoprene.
Please continue to refer to fig. 1 and fig. 2, the pipe joint connecting structure further includes a temporary stopping assembly for stopping the first jacking pipe joint 21, the temporary stopping assembly includes a stopping ring 81 and a plurality of fasteners 82, the stopping ring 81 is sleeved outside the first jacking pipe joint 21 and is located below the steel pressing ring 63, a plurality of stopping holes are circumferentially arranged on a side wall of the stopping ring 81, a plurality of slots are arranged on an outer wall of the first jacking pipe joint 21, and the fasteners 82 respectively penetrate through the stopping holes and are clamped into the corresponding slots. The temporary stopping assembly is used for connecting the first jacking pipe joint 21 and the second jacking pipe joint 22 and temporarily supports the first jacking pipe joint 21 to prevent the first jacking pipe joint 21 from falling. It should be understood that, when carrying out vertical jacking in steel ejector sleeve 10, will earlier through jacking device first jacking pipe coupling 21 jacking is to setting for the height, then utilizes temporary stopping subassembly holds and holds first jacking pipe coupling 21, this moment jacking device resets back jacking again second jacking pipe coupling 22, then utilizes coupling assembling connects behind first jacking pipe coupling 21 and the second jacking pipe coupling 22, unclamp fastener 82, and utilize jacking device continues the jacking second jacking pipe coupling 22 and drive first jacking pipe coupling 21 rises.
In this embodiment, the insertion grooves are recessed inward from the outer wall of the first jacking pipe section 21, and the insertion grooves are uniformly distributed along the circumferential direction of the first jacking pipe section 21 to balance stress of each part.
In this embodiment, the retaining hole and the insertion slot have internal threads with the same turning direction, and the fastening member 82 is a bolt in threaded connection with the retaining hole and the insertion slot. It will to set for the high back through the jacking device first jacking pipe coupling 21 jacking, clockwise (anticlockwise) rotatory bolt is in order to run through stopping hole and screw in correspond the slot to prevent first jacking pipe coupling 21 landing, when need not carry out the stopping, anticlockwise (clockwise) screw out the bolt can, simple structure, the operation of being convenient for.
Optionally, the fastening element 82 is a bolt, and the bolt penetrates through the threaded hole and is clamped into the corresponding slot.
With reference to fig. 1, the pre-embedded ring 62, the steel pressure ring 63 and the anti-backing ring 81 are connected by bolts. In this embodiment, the pre-buried ring 62, the steel clamping ring 63 and the check ring 81 are all provided with a plurality of threaded holes along the circumference correspondence, through the different threaded holes of bolt screw in are in order to realize threaded connection.
To sum up, the utility model provides a pipe coupling connection structure, include: the top of the steel jacking pipe is provided with an opening; the jacking pipe comprises a first jacking pipe joint and a second jacking pipe joint which are vertically arranged, wherein the first jacking pipe joint is positioned above the second jacking pipe joint, part of the first jacking pipe joint extends out of the hole, and the second jacking pipe joint is positioned in the hole; coupling assembling, including connecting piece and a plurality of connecting pin, the one end of connecting piece with the inner wall contact of first jacking pipe coupling, the other end with the interior wall connection of second jacking pipe coupling, the bottom of first jacking pipe coupling is provided with a plurality of connecting holes, on the connecting piece with the position department that the connecting hole corresponds is provided with the spread groove, the spread groove by the outer wall of connecting piece extends to in the connecting piece, it is a plurality of the connecting pin runs through the difference respectively the card is gone into behind the connecting hole and is corresponded in order to connect in the spread groove first jacking pipe coupling reaches second jacking pipe coupling. Adjacent jacking pipe joints are connected through the mode of bolt, and the construction that has avoided welding construction to bring is difficult, consuming time long and the security subalternation problem, just the connecting piece can be connected well with second jacking pipe joint in advance, on-the-spot direct mount can, easy operation and swift.
The above description is only for the preferred embodiment of the present invention, and does not limit the present invention. Any technical personnel who belongs to the technical field, in the scope that does not deviate from the technical scheme of the utility model, to the technical scheme and the technical content that the utility model discloses expose do the change such as the equivalent replacement of any form or modification, all belong to the content that does not break away from the technical scheme of the utility model, still belong to within the scope of protection of the utility model.
Claims (10)
1. A pipe joint connecting structure, comprising:
the steel jacking pipe is horizontally arranged, and the top of the steel jacking pipe is provided with an opening;
the jacking pipe comprises a first jacking pipe joint and a second jacking pipe joint which are vertically arranged, wherein the first jacking pipe joint is positioned above the second jacking pipe joint, part of the first jacking pipe joint extends out of the hole, and the second jacking pipe joint is positioned in the hole;
coupling assembling, including connecting piece and a plurality of connecting pin, the one end of connecting piece with the inner wall contact of first jacking pipe coupling, the other end with the interior wall connection of second jacking pipe coupling, the bottom of first jacking pipe coupling is provided with a plurality of connecting holes, on the connecting piece with the position department that the connecting hole corresponds is provided with the spread groove, the spread groove by the outer wall of connecting piece extends to in the connecting piece, it is a plurality of the connecting pin runs through the difference respectively the card is gone into behind the connecting hole and is corresponded in order to connect in the spread groove first jacking pipe coupling reaches second jacking pipe coupling.
2. A pipe joint connecting structure as claimed in claim 1, wherein said connecting member is ring-shaped, and a plurality of said connecting grooves are uniformly distributed along a circumferential direction of said connecting member.
3. The pipe coupling structure according to claim 1, wherein the connecting member comprises a plurality of bar-shaped blocks, each of the bar-shaped blocks is provided with the connecting groove, and the plurality of bar-shaped blocks are uniformly distributed along a circumferential direction of the second jacking pipe section.
4. A pipe coupling according to claim 1, wherein one end of the connecting pin is snapped into the connecting groove and the other end is flush with the outer wall of the first jacking pipe section.
5. The pipe joint connecting structure according to claim 1, wherein a plurality of sealing rings are further provided between the connecting member and the inner wall of the first jacking pipe joint.
6. A pipe joint connecting structure as claimed in claim 1, further comprising a water stopping member, the water stopping component comprises a steel jacket and a water stopping piece, the steel jacket is arranged in the opening, the water stopping piece is positioned on the inner side of the steel jacket and sleeved outside the first jacking pipe joint, the water stop piece comprises a pre-buried ring and a steel pressure ring which are arranged along the vertical direction, the pre-buried ring is positioned above the steel pressure ring, an annular first water stopping groove is arranged on one side of the embedded ring close to the first jacking pipe joint, an annular second water stopping groove is arranged on the steel pressure ring, an annular third water stopping groove is arranged between the embedded ring and the steel pressure ring, and a first water stop block is accommodated in the first water stop tank, and a second water stop block is accommodated in the second water stop tank and the third water stop tank.
7. The pipe joint connecting structure according to claim 6, wherein the first and second water stop blocks have a wedge shape and a circular shape in a cross-sectional shape in a vertical direction, respectively.
8. The pipe joint connecting structure of claim 6, further comprising a temporary stopping assembly for stopping the first jacking pipe joint, wherein the temporary stopping assembly comprises a stopping ring and a plurality of fasteners, the stopping ring is sleeved outside the first jacking pipe joint and is located below the steel pressure ring, a plurality of stopping holes are formed in the side wall of the stopping ring along the circumferential direction, a plurality of slots are formed in the outer wall of the first jacking pipe joint, and the plurality of fasteners penetrate through the stopping holes respectively and then extend into the corresponding slots.
9. The pipe joint connecting structure according to claim 8, wherein the retaining hole and the insertion groove have internal threads with the same direction of rotation, and the fastening member is a bolt threadedly coupled with the retaining hole and the insertion groove.
10. The pipe joint connecting structure according to claim 8, wherein the fastening member is a connecting pin, and the connecting pin extends through the retaining hole and then into the corresponding slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021112392.8U CN212429966U (en) | 2020-06-16 | 2020-06-16 | Pipe joint connecting structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021112392.8U CN212429966U (en) | 2020-06-16 | 2020-06-16 | Pipe joint connecting structure |
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| CN212429966U true CN212429966U (en) | 2021-01-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111577977A (en) * | 2020-06-16 | 2020-08-25 | 上海市机械施工集团有限公司 | Pipe joint connecting structure |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111577977A (en) * | 2020-06-16 | 2020-08-25 | 上海市机械施工集团有限公司 | Pipe joint connecting structure |
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