WO2007123306A1 - Steel pipe connection structure - Google Patents
Steel pipe connection structure Download PDFInfo
- Publication number
- WO2007123306A1 WO2007123306A1 PCT/KR2007/000798 KR2007000798W WO2007123306A1 WO 2007123306 A1 WO2007123306 A1 WO 2007123306A1 KR 2007000798 W KR2007000798 W KR 2007000798W WO 2007123306 A1 WO2007123306 A1 WO 2007123306A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- outer periphery
- flanges
- holes
- steel pipes
- flange
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 65
- 239000010959 steel Substances 0.000 title claims abstract description 65
- 230000008878 coupling Effects 0.000 claims abstract description 21
- 238000010168 coupling process Methods 0.000 claims abstract description 21
- 238000005859 coupling reaction Methods 0.000 claims abstract description 21
- 238000012856 packing Methods 0.000 claims abstract description 21
- 238000001746 injection moulding Methods 0.000 claims abstract description 5
- 238000010276 construction Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
- F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
- F16L23/028—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes the flanges being held against a shoulder
- F16L23/0283—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes the flanges being held against a shoulder the collar being integral with the pipe
-
- 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
- F16L23/00—Flanged joints
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
- F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
- F16L23/028—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes the flanges being held against a shoulder
-
- 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
- F16L23/00—Flanged joints
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
- F16L23/032—Flanged joints the flanges being connected by members tensioned axially characterised by the shape or composition of the flanges
-
- 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
- F16L23/00—Flanged joints
- F16L23/16—Flanged joints characterised by the sealing means
Abstract
A coupling structure for steel pipes includes first and second flanges attached to respective abutting ends of the steel pipes. The flanges have a flange body attached to the end of the steel pipe by injection molding and have a step in an outer periphery thereof. Two pairs of connecting pieces are arranged on upper and lower portions of an outer periphery of the step of the flanges. The connecting piece has connecting guides and connecting holes in an outer periphery thereof. A ring-shaped packing is interposed between the first and second flanges. The connecting guides are fastened with horizontal bolts to connect the steel pipes with each other. The packing has a plurality of fixing protrusions formed at a predetermined interval on an outer periphery thereof and a plurality of through holes each formed in a respective fixing protrusion to be fastened by the horizontal bolts.
Description
Description STEEL PIPE CONNECTION STRUCTURE
Technical Field
[1] The present invention relates to a coupling structure for steel pipes which includes flanges attached to abutting ends of the steel pipes, semi-circular connecting pieces fixed to steps of the flanges by vertical bolts, and horizontal bolts inserted into connecting guides of the connecting pieces and fastened with nuts, by which the flanges can be easily coupled between the steel pipes, thereby facilitating a construction process. As an alternative, one of the flanges may be provided with a connecting portion and connecting holes and then attached to one of the steel pipes in order to enhance efficiency. Background Art
[2] Concrete pipes produced by curing concrete are generally used to drain dirty water or waste water and to supply domestic water and industrial water. However, a lot of manpower and money are required to produce the concrete pipes, and the heavy weight of the produced concrete pipes results in poor process efficiency and a long construction period related to the storage and delivery of the concrete pipes.
[3] In order to solve these problems, steel pipes (e.g., a plain steel pipe and a corrugated steel pipe) have been proposed and used due to their properties such as pressure strength, structural stability, endurance, economical efficiency and constructability, which are better than those of the concrete pipes.
[4] The steel pipes, having a wavelike corrugated contour in inner and outer walls, are carried to the construction site, connected with each other using a separate steel pipe coupling, and buried at the construction site.
[5] In the steel pipe coupling, a pair of synthetic resin flanges is arranged at respective abutting ends of the steel pipes, with a bonding member interposed between the flanges, and is bonded with each other by hot-pressing to produce a hermetic seal. However, since the coupling is not separable once bonded, the maintenance of the coupling and the steel pipes is difficult.
[6] In order to facilitate the maintenance of the coupling, the flanges, arranged at the abutting ends of the steel pipes, are provided with a plurality of through holes, a packing is interposed between the flanges, and a plurality of bolts is inserted respectively into the through holes to hermetically couple the flanges with each other. However, in the case where the steel pipes have a relatively large diameter and are thus heavy, the centers of the paired through holes must be aligned together, so that the bolts can be inserted into pairs of the through holes of the flanges, which takes a long
time and thereby causes delays. Disclosure of Invention
Technical Problem
[7] The present invention has been made to solve the foregoing problems with the prior art, and thus an object of the invention is to provide a coupling structure for steel pipes which includes flanges attached to abutting ends of the steel pipes, semi-circular connecting pieces fixed to steps of the flanges by vertical bolts, and horizontal bolts inserted into connecting guides of the connecting pieces and fastened with nuts, by which the flanges can be easily coupled between the steel pipes, thereby facilitating a construction process. Technical Solution
[8] According to an aspect of the present invention, a coupling structure for steel pipes includes first and second flanges attached to respective abutting ends of the steel pipes, each of the flanges having a flange body attached to the end of the steel pipe by injection molding, the flange body having a step in an outer periphery thereof; first and second pair of connecting pieces, each of the first pair of connecting pieces arranged on a corresponding one of upper and lower portions of an outer periphery of the step of the first flange such that the inner periphery of the connecting piece contacts the outer periphery of the step, each of the second pair of connecting pieces arranged on a corresponding one of upper and lower portions of the outer periphery of the step of the second flange so that the inner periphery of the connecting piece contacts the outer periphery of the step, the connecting piece having connecting guides integrally formed in the outer periphery thereof, and connecting holes each extending through each of the connecting guides in the axial direction of the steel pipe; and a packing interposed between the first and second flanges and having a ring shape with a predetermined thickness. The connecting guides are fastened with horizontal bolts to connect the steel pipes to each other.
[9] Preferably, the second flange comprises an injection-molded connecting portion having connecting holes, the connecting holes of the second flange are coupled with connecting holes of the connecting pieces by the horizontal bolts, and the packing is interposed between the first flange and the connecting portion.
[10] The packing has a plurality of fixing protrusions formed at a predetermined interval in the outer periphery thereof, and a plurality of through holes each formed in a respective fixing protrusion, so that the packing is coupled with the first and second flanges by the horizontal bolts inserted through the connecting guides and the through holes.
Advantageous Effects
[11] According to the coupling structure for steel pipes of the present invention, as set forth above, the flanges are attached to abutting ends of the steel pipes and the semicircular connecting pieces are fixed to steps of the flanges by vertical bolts and horizontal bolts inserted into connecting guides of the connecting pieces and fastened with nuts so that the flanges can be easily coupled between the steel pipes, thereby facilitating a construction process.
[12] As an alternative, one of the flanges may have a connecting portion and connecting holes and thus can be attached to an existing steel pipe. This can consequently enhance the usage of the present invention. Brief Description of the Drawings
[13] FIG. 1 is a perspective view illustrating a coupling structure for steel pipes according to the present invention;
[14] FIG. 2 is an exploded perspective view illustrating the coupling structure for steel pipes according to the present invention;
[15] FIG. 3 is a perspective view illustrating the internal constitution of the coupling structure for steel pipes according to the present invention;
[16] FIG. 4 is a longitudinal cross-sectional view illustrating the coupling structure for steel pipes, according to the present invention, in a disassembled position;
[17] FIG. 5 is a longitudinal cross-sectional view illustrating the coupling structure for steel pipes according to the present invention; and
[18] FIG. 6 is a longitudinal cross-sectional view illustrating another embodiment of the coupling structure for steel pipes according to the present invention. Best Mode for Carrying Out the Invention
[19] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.
[20] As shown in FIGS. 1 to 5, a coupling structure for steel pipes according to the present invention has flanges 100 and 100' that are coupled with each other in order to hermetically connect opposing steel pipes 200 and 200'. Each of the flanges 100, 100' includes a flange body 110, 110' attached to one end of the steel pipe 200, 200' and connecting pieces 120a and 120b, 120a' and 120b' coupled with the flange body 110 by vertical bolts 130.
[21] The flange body 110 is configured to cover the end section and inner and outer peripheral portions of the steel pipe 200 adjacent to the end section to a predetermined depth. It should be understood that the flange body 110 is neither fabricated separately from nor assembled to the steel pipe 200, but is integrally formed therewith by injecting molten polyethylene under high pressure into a mold which is arranged around the end of the steel pipe 200.
[22] In the outer periphery of the flange body 110, a step 111 is formed opposite the other steel pipe 200' in order to prevent the connecting pieces 120a and 120b, when coupled by the vertical bolts 130, from being detached axially from the steel pipe 200.
[23] According to the configuration of the connecting pieces 120a and 120b, the connecting pieces 120a and 120b are easily coupled with the injection-molded flange body 110 but are prevented from coming detached from the flange body 110. This configuration also gives the connecting pieces 120a and 120b a function of pressing a packing 160 against the connecting pieces 120a' and 120b' under a coupling force enabled by horizontal bolts 150, thereby ensuring a hermetic seal.
[24] For this purpose, the connecting piece 120a has a semi-circularly bent body with fastening holes 121 and 121' formed in both ends thereof. The inner periphery of the connecting piece 120a is configured to sit on the upper part of the outer periphery of the step 111 of the flange body 110. The connecting piece 120b has a pairing configuration of the connecting piece 120a. That is, the connecting piece 120b has a semi- circularly bent body with fastening holes 122 and 122' formed in both ends thereof. The inner periphery of the connecting piece 120b is configured to sit on the lower part of the outer periphery of the step 111 of the flange body 110.
[25] The fastening holes 121 and 121' are formed in both ends of the connecting piece
120a and the fastening holes 122 and 122' are formed in both ends of the connecting piece 120a' in positions opposing the fastening holes 121 and 121' of the connecting piece 120a so that the fastening holes 121 and 121'; 122 and 122 are center- aligned accordingly and fastened by the vertical bolts 130.
[26] In addition, the connecting pieces 120a and 120b are provided with connecting guides 140a and 140b on the outer periphery thereof, respectively, so as to be coupled with the adjacent connecting pieces 120a' and 120b'. Each of the connecting guides 140a, 140b has a connecting hole 141a, 141b extending in the axial direction of the steel pipe. The connecting guides 140a and 140b are connected with opposing connecting guides 140a' and 140b', having a matching configuration, by the horizontal bolts 150 and nuts 151 in order to connect the connecting pieces 120a and 120b with the adjacent connecting pieces 120a' and 120b', thereby coupling the steel pipes 200 and 200' with each other.
[27] Connecting guides 140a' and 140', having a configuration matching that of the connecting guides 140a and 140b, having the connecting holes 141a and 141b, are formed on the outer periphery of the adjacent connecting pieces 120a' and 120b', and connecting holes 141a' and 141b' are formed in the connecting guides 140a' and 140', respectively.
[28] The connecting guide 140a has one end integrated with the outer periphery of the connecting piece 120a and the other end extending to the step 111 of the flange body
110. Preferably, the extended end of the connecting guide 140a, more specifically, the inner part of the outer periphery of the extended end is configured to contact the outer periphery of the flange body 110. The packing 160 is interposed between one assembly of the connecting pieces 120a and 120b and the other assembly of the connecting pieces 120a' and 120b'.
[29] The packing 160 has the shape of a ring having a predetermined thickness in order to prevent leakage from the inside to the outside under a tightening force created by the horizontal bolts 150 and the nuts 151.
[30] In addition, a plurality of fixing protrusions 162, each having a through hole 161, is formed on the outer periphery of the packing 160 at a predetermined interval, so that the position of the packing 160 is not changed by the horizontal bolts 150, which are inserted into the connecting guides 140a, 140a', 140b and 140b'.
[31] While the flange bodies 110 and 110' , coupled to the facing ends of the steel pipes
200 and 200', and the connecting pieces 120a and 120b, 120a' and 120b' are injection- molded from polyethylene, this is not intended to limit the present invention. As an alternative, the flange bodies 110 and 110' and the connecting pipes 120a and 120b, 120a' and 120b' can be made from cast metal.
[32] Each of the steel pipes 200, 200' may be produced by capping a mold on one end of the steel pipe 200, 200' and injecting molten polyethylene resin under high pressure into the mold, thereby forming the ring-shaped flange body 110, 110' by injection- molding. This, as a result, produces the steel pipe 200, 200' having the synthetic resin flange 100, 100'.
[33] Then, the connecting pieces 120a and 120b, 120a' and 120b' are fabricated by injection molding using a mold (not shown), and the packing 160 is fabricated by punching a wide louver plate.
[34] After the aforementioned process, a pit for the steel pipes 200 and 200' is dug into the ground, and the steel pipes 200 and 200' are inserted into the pit with the flanges 100 and 100' attached to respective steel pipes 200 and 200'. Then, the inner peripheries of the connecting pieces 120a and 120b, 120a' and 120b' are butted against the outer periphery of the step 111 at one end of the steel pipe 200, 200' and the vertical bolts 130 are inserted into the fastening holes 121 and 121', 122 and 122' to fix the connecting pieces 120a and 120b, 120a' and 120b' to the steel pipe 200, 200'.
[35] The connecting pieces 120a and 120b on one side are fixed so that they cannot move freely, but the connecting pieces 120a' and 120b' on the other side are loosely pre-assembled so as to allow free rotation with a small interval in a direction perpendicular to the axis along the outer periphery of the step.
[36] The horizontal bolts 150 are inserted into the connecting holes 141a and 141b of the connecting guides 140a and 140b of the connecting pieces 120a and 120b so that the
horizontal bolts 150 extend through the through holes 161 of the fixing protrusions 162 of the packing 160 and the ends of the horizontal bolts 150 are inserted into the connecting holes 140a' and 140b' of the connecting pieces 120a' and 120b'.
[37] Once all the horizontal bolts 150 are inserted, as explained above, the vertical bolts
130 pre-assembled to both ends of the connecting pieces 120a' and 120b' are fixedly tightened so that there is no play, and the nuts 151 are fastened with the horizontal bolts 150 in order to connect the steel pipes 200 and 200' with each other. Then, the process of constructing the steel pipes is accomplished by covering the steel pipes 200 and 200' with soil.
[38] In this embodiment, the connecting pieces 120a and 120b; 120a' and 120b', which are separated in a semi-circular or curved configuration, have been described as being attached to the steps 111 of the flange bodies 110 and 110' by the vertical bolts 130 and being arranged to face each other, the packing 160 as being interposed between the flange bodies 110 and 110', and the flanges 110 and 110' and the packing 160 as being assembled together by the horizontal bolts 150 and the nuts 151. In addition to this structure, as shown in FIG. 6, the flange attached to the steel pipe 200' may be provided with an injection-molded connecting portion 300 having connecting holes 310 in positions corresponding to the connecting holes 141a and 141b of the connecting pieces 120a and 120b.
[39] In this case, it is preferable that the horizontal bolts 150 be inserted into the connecting holes 310 and fixed therein by engagement with the nuts 151, and that the packing 160 be interposed between the connecting portion 300 and the flange 100.
Claims
[1] A coupling structure for steel pipes, comprising: first and second flanges attached to respective abutting ends of the steel pipes, each of the flanges having a flange body attached to the end of the steel pipe by injection molding, the flange body having a step in an outer periphery thereof; first and second pair of connecting pieces, each of the first pair of connecting pieces arranged on a corresponding one of upper and lower portions of an outer periphery of the step of the first flange so that an inner periphery of the connecting piece contacts the outer periphery of the step, each of the second pair of connecting pieces arranged on a corresponding one of upper and lower portions of an outer periphery of the step of the second flange so that an inner periphery of the connecting piece contacts the outer periphery of the step, the connecting piece having connecting guides integrally formed in an outer periphery thereof and connecting holes each extending through each of the connecting guides in an axial direction of the steel pipe; and a packing interposed between the first and second flanges and having a ring shape with a predetermined thickness, wherein the connecting guides are fastened with horizontal bolts to connect the steel pipes with each other, and wherein the packing has a plurality of fixing protrusions formed at a predetermined interval on an outer periphery thereof and a plurality of through holes each formed in a respective fixing protrusion so that the packing is coupled with the first and second flanges by the horizontal bolts inserted through the connecting guides and the through holes.
[2] The coupling structure according to claim 1, wherein the second flange comprises an injection-molded connecting portion having connecting holes, wherein the connecting holes of the second flange are coupled with connecting holes of the connecting pieces by the horizontal bolts, and wherein the packing is interposed between the first flange and the connecting portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020060035700A KR100630353B1 (en) | 2006-04-20 | 2006-04-20 | Steel pipe connection structure |
| KR10-2006-0035700 | 2006-04-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007123306A1 true WO2007123306A1 (en) | 2007-11-01 |
Family
ID=37622695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2007/000798 WO2007123306A1 (en) | 2006-04-20 | 2007-02-15 | Steel pipe connection structure |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100630353B1 (en) |
| WO (1) | WO2007123306A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITGE20100088A1 (en) * | 2010-08-03 | 2012-02-04 | Faic Srl | TIGHTENING COLLAR |
| CN102979349A (en) * | 2012-11-15 | 2013-03-20 | 浙江永达电力实业股份有限公司 | Electric pole core |
| US10781948B1 (en) | 2019-11-04 | 2020-09-22 | Trinity Bay Equipment Holdings, LLC | Pipe connector with annular communication |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101009615B1 (en) * | 2008-06-20 | 2011-01-21 | 한국기초과학지원연구원 | Structure of junction between rectangular wave guide and window |
| KR101084398B1 (en) | 2009-03-06 | 2011-11-18 | 이석정 | Water pipe with flange connection means |
| KR101084444B1 (en) | 2009-03-06 | 2011-11-21 | 이석정 | Water pipe with flange connection means |
| KR101267032B1 (en) * | 2012-10-22 | 2013-05-24 | 주식회사 픽슨 | Flange with integrated corrugated steel pipes and its forming device |
| KR101267031B1 (en) * | 2012-10-22 | 2013-05-24 | 주식회사 픽슨 | Flange with integrated corrugated steel pipes and its molding apparatus |
| KR101438398B1 (en) * | 2013-05-29 | 2014-09-12 | 주식회사 픽슨 | Flanged pipe connection structure |
| KR101431591B1 (en) | 2014-04-18 | 2014-08-20 | 대한강관 주식회사 | Device for connecting corrugated spiral pipes |
| KR101684373B1 (en) * | 2015-01-28 | 2016-12-08 | 대우조선해양 주식회사 | Apparatus for supplying cooling water supplied from onshore into floating power plant |
| KR102277149B1 (en) * | 2021-04-29 | 2021-07-14 | 대한강관 주식회사 | Connection of double corrugated steel pipe with rotatable flange and double corrugated steel pipe with same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5553531A (en) * | 1978-10-16 | 1980-04-19 | Ikuhiro Iwata | Method of connecting pipe made of polybutene-1 resin |
| US4620731A (en) * | 1985-08-01 | 1986-11-04 | Rushing Bendel S | Apparatus for sealing pipe flanges |
| JPH05272670A (en) * | 1992-03-26 | 1993-10-19 | Hayashi Eng Kk | Pipe coupling structure for synthetic resin pipe |
-
2006
- 2006-04-20 KR KR1020060035700A patent/KR100630353B1/en active IP Right Grant
-
2007
- 2007-02-15 WO PCT/KR2007/000798 patent/WO2007123306A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5553531A (en) * | 1978-10-16 | 1980-04-19 | Ikuhiro Iwata | Method of connecting pipe made of polybutene-1 resin |
| US4620731A (en) * | 1985-08-01 | 1986-11-04 | Rushing Bendel S | Apparatus for sealing pipe flanges |
| JPH05272670A (en) * | 1992-03-26 | 1993-10-19 | Hayashi Eng Kk | Pipe coupling structure for synthetic resin pipe |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITGE20100088A1 (en) * | 2010-08-03 | 2012-02-04 | Faic Srl | TIGHTENING COLLAR |
| WO2012017373A1 (en) * | 2010-08-03 | 2012-02-09 | Faic S.R.L. | Clamping collar |
| CN102979349A (en) * | 2012-11-15 | 2013-03-20 | 浙江永达电力实业股份有限公司 | Electric pole core |
| US10781948B1 (en) | 2019-11-04 | 2020-09-22 | Trinity Bay Equipment Holdings, LLC | Pipe connector with annular communication |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100630353B1 (en) | 2006-10-02 |
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