CN220727414U - Inter-pipe-section seepage-proofing structure of large-section rectangular jacking pipe - Google Patents
Inter-pipe-section seepage-proofing structure of large-section rectangular jacking pipe Download PDFInfo
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- CN220727414U CN220727414U CN202322341358.8U CN202322341358U CN220727414U CN 220727414 U CN220727414 U CN 220727414U CN 202322341358 U CN202322341358 U CN 202322341358U CN 220727414 U CN220727414 U CN 220727414U
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- steel
- jacking
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 98
- 239000010959 steel Substances 0.000 claims abstract description 98
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000007789 sealing Methods 0.000 claims abstract description 50
- 230000002093 peripheral effect Effects 0.000 claims abstract description 25
- 239000004588 polyurethane sealant Substances 0.000 claims abstract description 11
- 230000002265 prevention Effects 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 10
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 8
- 239000000565 sealant Substances 0.000 claims description 7
- 229920001971 elastomer Polymers 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000012466 permeate Substances 0.000 abstract description 2
- 230000000246 remedial effect Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 5
- 239000002023 wood Substances 0.000 description 5
- 230000000149 penetrating effect Effects 0.000 description 4
- 239000002689 soil Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Abstract
The embodiment of the application provides an inter-pipe joint seepage-proofing structure of a large-section rectangular jacking pipe, which comprises a plurality of jacking pipe joints connected in sequence, wherein a socket and a spigot are respectively formed at the front end and the rear end of each jacking pipe joint, an interface steel collar is closely attached to the outer peripheral surface of the spigot, and a first steel ring, a first elastic water-stop sealing ring, a second steel ring and a second elastic water-stop sealing ring are arranged between the interface steel collar and the outer peripheral surface of the socket; a gasket is arranged at the joint of the adjacent pipe joints of the jacking pipe, an elastic sealing gasket is embedded in the middle of the gasket, and a caulking groove at the inner side of the pipe joint of the jacking pipe is filled with polyurethane sealant; when water seepage occurs, the inner side of a joint of the adjacent pipe joint of the jacking pipe is connected with a closed steel ring to be taken as a remedial measure; the technical problem that the seepage prevention structure between pipe joints of the existing rectangular jacking pipe is easy to permeate water, and emergency measures under the condition that waterproof measures fail are lacking is solved.
Description
Technical Field
The utility model relates to the technical field of constructional engineering, in particular to an inter-pipe joint seepage-proofing structure of a large-section rectangular jacking pipe.
Background
With the rapid development of urban construction in China, the rectangular pipe jacking method is used as an environment-friendly, safe, environment-friendly and efficient underground engineering construction technology, is applied to various fields of urban underground space development, and gradually becomes a research hot spot. When the large-section rectangular jacking pipe passes through the pressure-bearing water layer, water is rich in soil layers, water seepage is easy to occur among pipe joints, and therefore how to perform seepage prevention among the pipe joints of the rectangular jacking pipe becomes an important subject.
At present, the national specifications and the atlas only aim at the related regulations of the joint structure of the pipe section of the conventional pipe-jacking pipe, and do not specially aim at the related regulations of the pipe-jacking pipe penetrating through the bearing water layer and the water-containing rich soil layer, but the seepage prevention among the pipe sections of the conventional pipe-jacking pipe usually adopts a single-channel water stop ring and a polyurethane sealant caulking joint, and aims at the condition that the large-section pipe-jacking pipe penetrates through the bearing water layer, the following problems exist:
1. for the jacking pipe penetrating through the pressure-bearing water layer, the water content of the soil layer is rich, and the waterproof capability of the single-channel water stop ring is weak;
2. the pipe joints are usually lined with wood materials, but gaps are easy to exist among the wood materials, and water seepage channels are reserved;
3. there is a lack of emergency methods in the event of failure of other waterproofing measures during the use phase.
Disclosure of Invention
The embodiment of the utility model provides an inter-pipe joint seepage-proofing structure of a large-section rectangular jacking pipe, which aims to solve the technical problems that the existing inter-pipe joint seepage-proofing structure of the rectangular jacking pipe is easy to permeate water and lacks emergency measures under the condition that waterproof measures fail.
The utility model provides an inter-pipe joint seepage-proofing structure of a large-section rectangular pipe jacking, which comprises a plurality of pipe jacking pipe joints connected in sequence, wherein adjacent pipe jacking pipe joints are connected in a socket-spigot manner through an interface steel collar; taking the jacking direction of a pipe joint of the jacking pipe as the forward direction, respectively forming a socket and a bellmouth at the front and rear ends of the pipe joint of the jacking pipe for being connected with the interface steel sleeve ring, wherein the interface steel sleeve ring is closely attached to the peripheral surface of the bellmouth, and a first steel ring, a first elastic water-stop sealing ring, a second steel ring and a second elastic water-stop sealing ring are sequentially arranged between the interface steel sleeve ring and the peripheral surface of the socket from front to back; a gasket is arranged at the joint of the adjacent pipe-jacking pipe joints, an elastic sealing gasket for blocking a water seepage channel is embedded in the middle of the gasket, and a caulking groove at the inner side of the pipe-jacking pipe joint is filled with polyurethane sealant; when leakage occurs at the joint of the adjacent pipe-jacking pipe joints, a closed steel ring for closing the joint is arranged at the inner side of the joint.
Optionally, a water-stop steel ring is arranged between the front end of the interface steel collar and the outer peripheral surface of the socket, the water-stop steel ring is pre-embedded to the outer peripheral surface of the socket, and extrusion type sealant is embedded between two convex ribs of the water-stop steel ring; the caulking groove formed between the rear end of the outer peripheral surface of the socket and the steel collar of the interface is embedded and injected by polyurethane sealant.
Optionally, a waterproof grouting hole is arranged between the first steel ring and the first elastic water stop sealing ring, and the waterproof grouting hole penetrates through the pipe wall of the pipe-jacking pipe joint in the radial direction.
Alternatively, the pad is made of a wood material plate with medium hardness, and the plate joints are connected in a tongue-and-groove mode.
Optionally, the first elastic water stop sealing ring and the second elastic water stop sealing ring are made of neoprene or a neoprene-water expansion rubber compound and are adhered to the base surface of the pipe joint by an adhesive.
Optionally, a connecting steel ring is pre-buried in the inner side of the pipe joint of the top pipe adjacent to the joint, and two ends of the closed steel ring are welded and fixed to the connecting steel rings on two sides of the joint respectively.
Optionally, a water receiving box is installed at the inner side of the joint of the adjacent top pipe section, and the water receiving box is arranged on the top plate and the side wall of the top pipe section.
Optionally, a plurality of prestressed pipes are reserved in the top pipe section at intervals along the circumferential direction of the pipe section.
Optionally, a plurality of embedded parts are arranged on the inner side of the pipe section of the pipe jacking at intervals along the circumferential direction of the pipe section, the embedded parts of the pipe section of the pipe jacking are correspondingly arranged on two sides of the joint, and channel steel is welded between the corresponding embedded parts to carry out drawknot.
The embodiment of the utility model has the following beneficial effects:
1. a first steel ring, a first elastic water-stop sealing ring, a second steel ring and a second elastic water-stop sealing ring are arranged between the interface steel collar and the outer peripheral surface of the socket, and the waterproof capacity between the interface steel collar and the socket is improved by utilizing the double-channel elastic water-stop sealing ring;
2. an elastic sealing gasket is embedded in the middle of the gasket, and the water seepage channel of the gasket is plugged by the elastic sealing gasket, so that water seepage at the joint of the pipe joint of the jacking pipe is avoided;
3. when leakage occurs at the joint of the adjacent pipe joints of the jacking pipe, connecting a closed steel ring at the inner side of the joint, and using the closed steel ring to close the joint as a remedy under the condition of failure of other waterproof measures;
4. and (3) penetrating a steel strand into the prestressed pipeline of the pipe joint of the pipe, tensioning the prestress, welding channel steel between corresponding embedded parts on the inner sides of the adjacent pipe joints of the pipe, and performing drawknot to ensure the connection reliability between the pipe joints of the pipe.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an inter-pipe joint barrier structure according to an embodiment of the present utility model;
FIG. 2 is a schematic view of a closed steel ring according to an embodiment of the present utility model;
FIG. 3 is a cross-sectional view of a top pipe section in an embodiment of the present utility model;
fig. 4 is a schematic diagram of a channel steel tie of a pipe section of a pipe jacking pipe according to an embodiment of the present utility model;
the figures represent the numbers:
1. jacking pipe joints; 2. a steel collar of the interface; 3. a socket; 4. a water-stopping steel ring; 5. extruding sealant; 6. polyurethane sealant; 7. a socket; 8. a first steel ring; 9. a first elastic water-stop sealing ring; 10. a second steel ring; 11. a second elastic water-stopping sealing ring; 12. a gasket; 13. an elastic sealing gasket; 14. closing the steel ring; 15. connecting a steel ring; 16. a water receiving box; 17. a screw; 18. a prestressed pipe; 19. an embedded part; 20. channel steel; 21. waterproof grouting holes.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and description only, and is not intended to limit the utility model. For convenience of description, in the present utility model, unless otherwise indicated, terms such as "front" and "rear" are used to refer to front and rear of the pipe section 1 in actual use or working state, and specifically, the jacking direction of the pipe section 1 is forward; while "inner" and "outer" are for the profile of the top pipe section 1.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first," "second," etc. may explicitly or implicitly include one or more features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1, an embodiment of the present utility model provides an inter-pipe joint seepage-proofing structure of a large-section rectangular pipe jacking, which comprises a plurality of pipe jacking pipe joints 1 connected in sequence, wherein adjacent pipe jacking pipe joints 1 are in socket connection ("F" type socket connection) through an interface steel collar 2.
The rear end of the push pipe joint 1 is provided with a socket 3 which is used for being connected with a joint steel lantern ring 2, and the joint steel lantern ring 2 is closely attached to the outer peripheral surface of the socket 3. Specifically, a water-stop steel ring 4 is arranged between the front end of the interface steel collar 2 and the outer peripheral surface of the socket 3, the water-stop steel ring 4 is pre-embedded to the outer peripheral surface of the socket 3, and extrusion type sealant 5 (the material of which can be single-component water expansion sealant) is embedded between two convex ribs of the water-stop steel ring 4; the caulking groove formed between the rear end of the outer peripheral surface of the socket 3 and the joint steel lantern ring 2 is embedded by adopting polyurethane sealant 6, so that two rings of water-stop closed rings are formed between the joint steel lantern ring 2 and the outer peripheral surface of the socket 3 of the pipe joint 1.
The front end of the jacking pipe joint 1 is correspondingly provided with a socket 7 for being connected with the interface steel lantern ring 2, a first steel ring 8, a first elastic water stop sealing ring 9, a second steel ring 10 and a second elastic water stop sealing ring 11 are sequentially arranged between the interface steel lantern ring 2 and the peripheral surface of the socket 7 from front to back, and the waterproof capability between the interface steel lantern ring 2 and the socket is improved by utilizing the double-channel elastic water stop sealing ring; the first elastic water-stop sealing ring 9 and the second elastic water-stop sealing ring 11 are adhered to the base surface of the pipe joint by an adhesive, and the materials of the first elastic water-stop sealing ring and the second elastic water-stop sealing ring are preferably neoprene or neoprene and water-swelling rubber composite.
The joints of the adjacent pipe joints 1 are provided with gaskets 12, the gaskets 12 are usually made of medium-hardness wood material plates, and the plate joints are connected in a tongue-and-groove mode; an elastic sealing pad 13 (which can be made of neoprene or a neoprene-water expansion rubber compound) is embedded in the middle of the pad 12 and is used for blocking a water seepage channel of the pad 12; the caulking groove on the inner side of the pipe joint 1 of the jacking pipe is also filled by polyurethane sealant 6. The water receiving boxes 16 are arranged on the inner sides of joints of the adjacent pipe pushing joints 1, the water receiving boxes 16 are arranged on the top plate and the side walls of the pipe pushing joints 1, screw rods 17 for fixing the water receiving boxes 16 are needed to be pre-buried on the inner sides of the pipe pushing joints 1 in advance, and expansion bolts cannot be beaten at later stages.
When leakage occurs at the joint of the adjacent jacking pipe joints 1, especially when a large amount of leakage causes the water receiving box 16 to be unable to be completely accommodated, the water receiving box 16 needs to be dismantled, the sealing steel ring 14 is connected to the inner side of the joint, and the sealing steel ring 14 is used for sealing the joint, so that the sealing steel ring is used as a remedy for the failure condition of the waterproof measure. Specifically, as shown in fig. 2, a connecting steel ring 15 is pre-embedded in the inner side of the pipe section 1 adjacent to the joint, and two ends of the closed steel ring 14 are welded and fixed to the connecting steel rings 15 on two sides of the joint respectively.
In addition, as shown in fig. 3 and 4, a plurality of prestressed pipes 18 are reserved in the pipe section 1 at intervals along the circumferential direction of the pipe section, a plurality of embedded parts 19 are arranged in the pipe section 1 at intervals along the circumferential direction of the pipe section, and the embedded parts 19 of the adjacent pipe section 1 are correspondingly arranged at two sides of the joint; after jacking of the pipe section 1 of the pipe is finished, steel strands need to be penetrated into the prestressed pipeline 18 of the pipe section 1 of the pipe, prestress is tensioned, an anchor is sealed by grouting, and channel steel 20 is welded between corresponding embedded parts 19 on the inner sides of the adjacent pipe sections 1 of the pipe for drawknot, so that the reliability of connection between the pipe sections 1 of the pipe is ensured.
A waterproof grouting hole 21 is further formed between the first steel ring 8 and the first elastic water stop sealing ring 9, the waterproof grouting hole 21 penetrates through the pipe wall of the pipe jacking pipe joint 1 in the radial direction, and after the pipe jacking pipe joint 1 is tensioned, polyurethane slurry is grouting into the waterproof grouting hole 21.
Correspondingly, the construction method of the large-section rectangular jacking pipe mainly comprises the following steps of:
s1, conveying the prefabricated pipe-jacking pipe joint 1 to a construction site, wherein a socket 3 used for being connected with a joint steel lantern ring 2 is formed at the rear end of the pipe-jacking pipe joint 1, and the joint steel lantern ring 2 is closely attached to the outer peripheral surface of the socket 3. When the pipe-jacking pipe joint 1 is manufactured, a water-stopping steel ring 4 is required to be arranged between the front end of the joint steel lantern ring 2 and the outer peripheral surface of the bell mouth 3, the water-stopping steel ring 4 is pre-buried to the outer peripheral surface of the bell mouth 3, and extrusion type sealant 5 is embedded between two convex ribs of the water-stopping steel ring 4, and the material of the water-stopping steel ring can be single-component water expansion sealant; the caulking groove formed between the rear end of the outer peripheral surface of the bell mouth 3 and the joint steel lantern ring 2 is embedded by adopting polyurethane sealant 6, so that two rings of water-stop closed rings are formed between the joint steel lantern ring 2 and the outer peripheral surface of the bell mouth 3 of the pipe joint 1.
The front end of the jacking pipe joint 1 is provided with a socket 7 for being connected with the interface steel collar 2, and the peripheral surface of the socket 7 is sequentially provided with a first steel ring 8, a first elastic water-stop sealing ring 9, a second steel ring 10 and a second elastic water-stop sealing ring 11 from front to back; the first elastic water-stop sealing ring 9 and the second elastic water-stop sealing ring 11 are adhered to the base surface of the pipe joint by an adhesive, and the materials of the first elastic water-stop sealing ring and the second elastic water-stop sealing ring are preferably neoprene or neoprene and water-swelling rubber composite. A waterproof grouting hole 21 is arranged between the first steel ring 8 and the first elastic water stop sealing ring 9, and the waterproof grouting hole 21 penetrates through the pipe wall of the pipe section 1 along the radial direction.
S2, jacking construction, wherein adjacent jacking pipe joints 1 are in socket connection ("F" -shaped socket connection) through an interface steel collar 2, a middle-hardness wood material plate is adopted as a gasket 12 at the joint of the adjacent jacking pipe joints 1, and the plate joints are connected in a tongue-and-groove mode; an elastic sealing gasket 13 is embedded in the middle of the gasket 12, and the elastic sealing gasket 13 can be made of neoprene or a neoprene-water expansion rubber compound for sealing a water seepage channel of the gasket 12; the caulking groove on the inner side of the jacking pipe joint 1 is filled by polyurethane sealant 6.
And S3, after jacking, penetrating steel strands into the prestressed pipeline 18 in the jacking pipe section 1, tensioning the prestress, grouting for sealing anchors, and welding channel steel 20 between corresponding embedded parts 19 on the inner sides of the adjacent jacking pipe sections 1 for drawknot.
And S4, after tensioning is finished, polyurethane slurry is injected into the waterproof grouting holes 21 for grouting.
S5, installing a water receiving box 16 on the inner side of a joint of the top plate and the side wall of the top pipe joint 1, pre-burying a screw 17 for fixing the water receiving box 16 on the inner side of the top pipe joint 1 before installation, wherein the pre-burying depth of the screw 17 is not less than 70mm, and expansion bolts cannot be later beaten.
S6, when leakage occurs at the joint of the adjacent pipe section 1, and the leakage water quantity exceeds the containing quantity of the water receiving box 16, the water receiving box 16 is disassembled, the inner side of the joint is connected with the sealing steel ring 14, the joint is sealed by the sealing steel ring 14, and the sealing steel ring is used as a remedy measure under the condition of failure of other waterproof measures.
The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of the above examples is only for aiding in understanding the technical solution of the present utility model and its core ideas; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (9)
1. The utility model provides a seepage prevention structure between pipe sections of big section rectangle push pipe, includes a plurality of push pipe sections that connect gradually, adjacent connect through interface steel lantern ring socket joint between the push pipe section, its characterized in that: taking the jacking direction of a pipe joint of the jacking pipe as the forward direction, respectively forming a socket and a bellmouth at the front and rear ends of the pipe joint of the jacking pipe for being connected with the interface steel sleeve ring, wherein the interface steel sleeve ring is closely attached to the peripheral surface of the bellmouth, and a first steel ring, a first elastic water-stop sealing ring, a second steel ring and a second elastic water-stop sealing ring are sequentially arranged between the interface steel sleeve ring and the peripheral surface of the socket from front to back; a gasket is arranged at the joint of the adjacent pipe-jacking pipe joints, an elastic sealing gasket for blocking a water seepage channel is embedded in the middle of the gasket, and a caulking groove at the inner side of the pipe-jacking pipe joint is filled with polyurethane sealant; when leakage occurs at the joint of the adjacent pipe-jacking pipe joints, a closed steel ring for closing the joint is arranged at the inner side of the joint.
2. The pipe-section seepage-proofing structure of a large-section rectangular jacking pipe according to claim 1, wherein: a water-stopping steel ring is arranged between the front end of the joint steel collar and the outer peripheral surface of the bell mouth, the water-stopping steel ring is embedded to the outer peripheral surface of the bell mouth, and extrusion type sealant is embedded between two convex ribs of the water-stopping steel ring; the caulking groove formed between the rear end of the outer peripheral surface of the socket and the steel collar of the interface is embedded and injected by polyurethane sealant.
3. The pipe-section seepage-proofing structure of a large-section rectangular jacking pipe according to claim 1, wherein: and a waterproof grouting hole is arranged between the first steel ring and the first elastic water stop sealing ring, and the waterproof grouting hole penetrates through the pipe wall of the pipe-jacking pipe joint in the radial direction.
4. The pipe-section seepage-proofing structure of a large-section rectangular jacking pipe according to claim 1, wherein: the pad adopts a wooden material plate, and the plate joints are connected in a tongue-and-groove mode.
5. The pipe-section seepage-proofing structure of a large-section rectangular jacking pipe according to claim 1, wherein: the first elastic water stop sealing ring and the second elastic water stop sealing ring are made of neoprene or a neoprene-water expansion rubber compound and are adhered to the base surface of the pipe joint by an adhesive.
6. The pipe-section seepage-proofing structure of a large-section rectangular jacking pipe according to claim 1, wherein: and a connecting steel ring is respectively embedded at the inner side of the pipe joint of the top pipe and close to the joint, and two ends of the closed steel ring are respectively welded and fixed to the connecting steel rings at two sides of the joint.
7. The pipe-section seepage-proofing structure of a large-section rectangular jacking pipe according to claim 1, wherein: and a water receiving box is arranged at the inner side of the joint of the adjacent top pipe joints, and the water receiving box is arranged on the top plate and the side wall of the top pipe joints.
8. The inter-pipe joint seepage-proofing structure of a large-section rectangular jacking pipe according to any one of claims 1 to 7, wherein: and a plurality of prestressed pipes are reserved in the pipe section of the push pipe at intervals along the circumferential direction of the pipe section.
9. The pipe-section seepage-proofing structure of the large-section rectangular jacking pipe according to claim 8, wherein: the inner side of the pipe section of the push pipe is provided with a plurality of embedded parts along the circumferential direction of the pipe section at intervals, the embedded parts adjacent to the pipe section of the push pipe are correspondingly arranged on two sides of a joint, and channel steel is welded between the corresponding embedded parts to carry out drawknot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322341358.8U CN220727414U (en) | 2023-08-30 | 2023-08-30 | Inter-pipe-section seepage-proofing structure of large-section rectangular jacking pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322341358.8U CN220727414U (en) | 2023-08-30 | 2023-08-30 | Inter-pipe-section seepage-proofing structure of large-section rectangular jacking pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220727414U true CN220727414U (en) | 2024-04-05 |
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ID=90501388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322341358.8U Active CN220727414U (en) | 2023-08-30 | 2023-08-30 | Inter-pipe-section seepage-proofing structure of large-section rectangular jacking pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220727414U (en) |
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2023
- 2023-08-30 CN CN202322341358.8U patent/CN220727414U/en active Active
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