KR101864786B1 - Bracket of frp pipe - Google Patents

Bracket of frp pipe Download PDF

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Publication number
KR101864786B1
KR101864786B1 KR1020180001614A KR20180001614A KR101864786B1 KR 101864786 B1 KR101864786 B1 KR 101864786B1 KR 1020180001614 A KR1020180001614 A KR 1020180001614A KR 20180001614 A KR20180001614 A KR 20180001614A KR 101864786 B1 KR101864786 B1 KR 101864786B1
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KR
South Korea
Prior art keywords
axis
pipe
support shaft
supporting
shaft
Prior art date
Application number
KR1020180001614A
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Korean (ko)
Inventor
조동식
Original Assignee
조동식
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Publication date
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Priority to KR1020180001614A priority Critical patent/KR101864786B1/en
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Publication of KR101864786B1 publication Critical patent/KR101864786B1/en

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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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
    • F16B7/10—Telescoping systems
    • F16B7/105—Telescoping systems locking in discrete positions, e.g. in extreme extended position
    • 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
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • 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
    • F16L57/005—Protection of pipes or objects of similar shape against external or internal damage or wear specially adapted for the ends of pipes

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supports For Pipes And Cables (AREA)

Abstract

The present invention relates to an inner and outer main fixing brackets for an FRP pipe, and more particularly, to an inner and outer main fixing brackets for supporting an inner circumferential surface of an FRP pipe and a plurality of outer supporting brackets for supporting an outer circumferential surface of the FRP pipe, The present invention relates to an inner and outer main fixing brackets of an FRP pipe which can prevent the outer surface of a pipe from being damaged during transportation and prevent the large size of the large FRP pipe from being excessively heavy to bend or break one of the pipes.

Description

FRP pipe inner and outer main fixing brackets {BRACKET OF FRP PIPE}

The present invention relates to an inner and outer main fixing brackets for an FRP pipe, and more particularly, to an inner and outer main fixing brackets for supporting an inner circumferential surface of an FRP pipe and a plurality of outer supporting brackets for supporting an outer circumferential surface of the FRP pipe, The present invention relates to an inner and outer main fixing brackets of an FRP pipe which can prevent the outer surface of a pipe from being damaged during transportation and prevent the large size of the large FRP pipe from being excessively heavy to bend or break one of the pipes.

If an FRP pipe is buried underground, the connection of the pipe will often become weak when an uneven settlement occurs. It is manufactured by machining a groove on the inner surface of a joint pipe body made of FRP pipe and then inserting a rubber ring for watertightness. During the grooving process, cracks are generated in the joint pipe body and the strength is lowered, which often results in leakage. Since the grooves are formed on the inner surface of the joint pipe body, the thickness of the joint pipe must be made thick to maintain the strength of the joint pipe, so that the manufacturing cost is increased. When the high pressure is applied to the rubber ring fitted to the inner surface of the joint pipe body, There is a problem that the watertightness of the joint portion is deteriorated because the internal pressure can not be formed.

In order to solve the problem of FRP pipe, large pipe without joint pipe is manufactured and transported. However, the large-sized FRP pipe has a problem in that the outer surface of the pipe is damaged during transportation, and the large weight of the large FRP pipe is so heavy that one of the pipes is bent or broken.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the conventional problems, and it is an object of the present invention to provide a FRP pipe having a plurality of internal support brackets for supporting the inner circumferential surface of the FRP pipe and a plurality of external support brackets for supporting the outer circumferential surface of the FRP pipe, And the inner weight of the large FRP pipe is so heavy that it is possible to prevent any one of the pipe from being bent or broken.

The present invention relates to an FRP pipe having a plurality of internal support brackets 100 for supporting the inner circumferential surface of the FRP pipe 300 and a plurality of external support brackets 200 for supporting the outer circumferential surface of the FRP pipe 300, .

The inner and outer main fixing brackets of the FRP pipe of the present invention comprise a plurality of inner supporting brackets for supporting the inner circumferential surface of the FRP pipe and a plurality of outer supporting brackets for supporting the outer circumferential surface of the FRP pipe. And the large weight of the large FRP pipe is so heavy that any one of the pipes can be prevented from being bent or broken.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a FRP pipe inner and outer main fixing bracket of the present invention. FIG.
BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to an FRP pipe,
3 is a perspective view showing the inner and outer main fixing brackets of the FRP pipe of the present invention.
4 is a perspective view showing the inner and outer main fixing brackets of the FRP pipe according to the present invention.
5 is a perspective view showing the inner and outer main fixing brackets of the FRP pipe of the present invention.
6 is a perspective view showing the inner and outer main fixing brackets of the FRP pipe of the present invention.
7 is a perspective view showing the inner and outer main fixing brackets of the FRP pipe of the present invention.
8 is a perspective view showing the inner and outer main fixing brackets of the FRP pipe of the present invention.
9 is a perspective view showing the inner and outer main fixing brackets of the FRP pipe according to the present invention.

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of the invention to those skilled in the art. To fully disclose the scope of the invention, and the invention is only defined by the scope of the claims.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The term " comprises " And / or "comprising" does not exclude the presence or addition of one or more other elements in addition to the stated element. Like reference numerals refer to like elements throughout the specification and "and / or" include each and every combination of one or more of the elements mentioned. Although "first "," second "and the like are used to describe various components, it is needless to say that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense that is commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise. The terms spatially relative, "below", "beneath", "lower", "above", "upper" And can be used to easily describe a correlation between an element and other elements. Spatially relative terms should be understood in terms of the directions shown in the drawings, including the different directions of components at the time of use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element . Thus, the exemplary term "below" can include both downward and upward directions. The components can also be oriented in different directions, so that spatially relative terms can be interpreted according to orientation.

The present invention is characterized by a plurality of inner support brackets 100 for supporting the inner circumferential surface of the FRP pipe 300 and a plurality of outer support brackets 200 for supporting the outer circumferential surface of the FRP pipe 300, The support brackets 60 and 60 'are formed by combining the inner tube and the outer tube so that the length adjuster 50 can be formed. A Y-axis direction support shaft 10 coupled with the X-direction support shaft 20;

(40-1, 40'-1) are formed at both ends, and a central portion of the bracket (60) is connected to the connecting bracket (60) An X-axis direction support shaft 20 which is coupled to the Y-direction support shaft 20 by using the X-axis direction support shaft 20;

A plurality of connection support shafts 30, 30-1, 30-2, and 30-3 connected to the Y-axis direction support shaft 10 and the X-axis direction support shaft 20 by connection brackets 60-1; A nut 55 is formed on the outer surface of the outer tube 52 and an insertion hole 53 is formed on both sides of the outer tube 52. The inner tube 54 is formed on both sides of the inner tube 54, The fixing bar 58 is inserted into the through holes 53 and 53 'and the fixed bar fixing holes 59 and 59' in a state where the inner pipe 54 is inserted into the inside of the outer pipe 52 59 and 59 'and the fixing bolt 56 formed with the handle 57 is fixed to the nut so that the lengths of the Y axis supporting shaft 10 and the X axis supporting shaft 20 are adjusted, The outer support bracket 200 includes a ring body 210 supporting an outer circumferential surface of the FRP pipe 300; A connecting bolt 220 connecting both ends of the ring body 210; And a plurality of support protrusions 230 formed on an outer peripheral surface of the ring body 210. [

The present invention is characterized by a plurality of inner support brackets 100 for supporting the inner circumferential surface of the FRP pipe 300 and a plurality of outer support brackets 200 for supporting the outer circumferential surface of the FRP pipe 300, The support brackets 400 and 40 'are formed at both ends of the support bracket 400. The guide brackets 400 and 40' A Y-axis direction support shaft 10 to which the X-direction support shaft 20 and the Z-direction support shaft 90 are coupled; (40-1, 40'-1) are formed at both ends, and a central portion of the support brackets (40-1, 40'-1) is connected to the connection bracket (400) An X-axis direction support shaft 20 to which the Y-direction support shaft 10 and the Z-direction support shaft 90 are coupled;

The Y-direction support shaft 10 and the X-direction support shaft 20 are coupled to each other using connection brackets 400 at both ends of the inner tube and the outer tube so that the length adjuster 50 can be formed. A Z-axis supporting shaft 90; A plurality of connection support shafts 30, 30-1, 30-2, and 30-3 connected to the Y-axis direction support shaft 10 and the X-axis direction support shaft 20 by connection brackets 60-1; A nut 55 is formed on the outer surface of the outer tube 52 and an insertion hole 53 is formed on both sides of the outer tube 52. The inner tube 54 is formed on both sides of the inner tube 54, The fixing bar 58 is inserted into the through holes 53 and 53 'and the fixed bar fixing holes 59 and 59' in a state where the inner pipe 54 is inserted into the inside of the outer pipe 52 59 and 59 'and the fixing bolt 56 formed with the handle 57 is fixed to the nut so that the lengths of the Y axis supporting shaft 10 and the X axis supporting shaft 20 are adjusted, A control unit 50; The connecting bracket 400 is formed so that the X axis supporting shaft 20 can be inserted therein. Both the piping surfaces are coupled to each other by the hinge 412, and the bending protrusions 420 and 420 ' An X-axis pipe coupling part 410, 410 'having a plurality of bolt holes 422, 422' formed in the bending protrusions 420, 420 '; Is attached to the outer peripheral surface of one side of the X axis pipe coupling portions 410 and 410 'and is formed such that the Y axis supporting shaft 10 can be inserted therein. Both pipe surfaces are coupled by a hinge 442, The Y-axis pipe coupling portions 440 and 440 (hereinafter, referred to as " Y-axis pipe coupling portions ") having bending protrusions 450 and 450 'formed at the upper end of the pipe surface, and having a plurality of bolt holes 452 and 452' formed in the bending protrusions 450 and 450 ' '); And a Z axis pipe coupling part 430 attached to the outer circumferential surface of the other of the X axis pipe coupling parts 410 and 410 'and adapted to receive the Z axis support shaft 90, The outer support bracket 200 includes a ring body 210 supporting an outer circumferential surface of the FRP pipe 300; A connecting bolt 220 connecting both ends of the ring body 210; And a plurality of support protrusions 230 formed on an outer peripheral surface of the ring body 210. [

1 to 6, the present invention includes a plurality of inner support brackets 100 for supporting the inner circumferential surface of the FRP pipe 300 and a plurality of outer support brackets 200 for supporting the outer circumferential surface of the FRP pipe 300 Large-sized FRP pipe prevents the outer surface of the pipe from being damaged during transportation, and the large weight of the large FRP pipe is so heavy that it can prevent any one of the pipes from being bent or damaged

As shown in FIGS. 1 to 6, the Y-axis support shaft 10 has a structure in which an inner tube and an outer tube are coupled so that a length adjuster 50 can be formed, The X axis support shaft 20 is connected to the X axis support shaft 20 by a connecting bracket 60. The X axis support shaft 20 is connected to the X axis support shaft 20 50 are formed on both ends of the support bracket 60. The support portions 40-1, 40'-1 are formed at both ends of the support bracket 60. The center portion of the support bracket 60 is engaged with the Y- In case of FRP pipe which is combined with supporting shaft (20), it prevents the outer surface of pipe from being damaged during transportation and the large weight of the large FRP pipe is so heavy that any one of the pipes is prevented from being bent or broken .

1 to 6, in the present invention, the Y-axis direction support shaft 10 and the X-axis direction support shaft 20 are connected to each other by connecting brackets (30, 30-1, 30-2, A nut 55 is formed on the outer circumferential surface of the outer tube 52 in the support shaft length adjuster 50 and insertion holes 53 are formed on both sides of the outer tube 52 And the inner pipe 54 is formed with a plurality of fixing bar fixing holes 59 and 59 'on both sides of the inner pipe 54. In the state where the inner pipe 54 is inserted into the inside of the outer pipe 52, And the fixing bolt 56 formed with the knob 57 is fixed to the nut while the Y-axis supporting shaft 10 is fixed to the nut, And the length of the X-axis support shaft 20 is adjusted to prevent damage to the outer surface of the pipe in the case of a large-sized FRP pipe, and the large weight of the large FRP pipe is so heavy that either one of the pipes is bent damage It can prevent.

1 to 6, an external support bracket 200 according to the present invention includes a ring body 210 supporting an outer circumferential surface of the FRP pipe 300; A connecting bolt 220 connecting both ends of the ring body 210; And a plurality of support protrusions 230 formed on the outer circumferential surface of the ring body 210. The large FRP pipe is prevented from being damaged on the outer surface of the pipe in the case of carrying the large sized FRP pipe, It is possible to prevent either of them from being bent or broken.

7 to 9, the inner support bracket 100 of the present invention has a structure in which an inner tube and an outer tube are coupled to each other so that a length adjusting part 50 can be formed, and support parts 40 and 40 ' A Y-axis direction support shaft 10 having a central portion coupled to the X-direction support shaft 20 and the Z-direction support shaft 90 using a connection bracket 400; (40-1, 40'-1) are formed at both ends, and a central portion of the support brackets (40-1, 40'-1) is connected to the connection bracket (400) An X-axis direction support shaft 20 to which the Y-direction support shaft 10 and the Z-direction support shaft 90 are coupled; The Y-direction support shaft 10 and the X-direction support shaft 20 are coupled to each other using connection brackets 400 at both ends of the inner tube and the outer tube so that the length adjuster 50 can be formed. A Z-axis supporting shaft 90; A plurality of connection support shafts 30, 30-1, 30-2, and 30-3 connected to the Y-axis direction support shaft 10 and the X-axis direction support shaft 20 by connection brackets 60-1; A nut 55 is formed on the outer surface of the outer tube 52 and an insertion hole 53 is formed on both sides of the outer tube 52. The inner tube 54 is formed on both sides of the inner tube 54, The fixing bar 58 is inserted into the through holes 53 and 53 'and the fixed bar fixing holes 59 and 59' in a state where the inner pipe 54 is inserted into the inside of the outer pipe 52 59 and 59 'and the fixing bolt 56 formed with the handle 57 is fixed to the nut so that the lengths of the Y axis supporting shaft 10 and the X axis supporting shaft 20 are adjusted, A control unit 50; The connecting bracket 400 is formed so that the X axis supporting shaft 20 can be inserted therein. Both the piping surfaces are coupled to each other by the hinge 412, and the bending protrusions 420 and 420 ' An X-axis pipe coupling part 410, 410 'having a plurality of bolt holes 422, 422' formed in the bending protrusions 420, 420 '; Is attached to the outer peripheral surface of one side of the X axis pipe coupling portions 410 and 410 'and is formed such that the Y axis supporting shaft 10 can be inserted therein. Both pipe surfaces are coupled by a hinge 442, The Y-axis pipe coupling portions 440 and 440 (hereinafter, referred to as " Y-axis pipe coupling portions ") having bending protrusions 450 and 450 'formed at the upper end of the pipe surface, and having a plurality of bolt holes 452 and 452' formed in the bending protrusions 450 and 450 ' '); And a Z axis pipe coupling part 430 attached to the outer circumferential surface of the other of the X axis pipe coupling parts 410 and 410 'and adapted to be inserted into the Z axis direction support shaft 90 In case of manufactured FRP pipe, the outer surface of the pipe is prevented from being damaged during transportation, and the large weight of the large FRP pipe is so heavy that any one of the pipes can be prevented from being bent or broken.

10: Y-axis direction supporting axis 20: X-axis direction supporting axis
30, 30-1, 30-2, 30-3:

Claims (2)

A plurality of inner support brackets 100 for supporting the inner circumferential surface of the FRP pipe 300 and a plurality of outer support brackets 200 for supporting the outer circumferential surface of the FRP pipe 300,
The inner support bracket 100 has a structure in which an inner tube and an outer tube are coupled to form a length adjusting part 50. Support parts 40 and 40 'are formed at both ends of the inner support bracket 100, A Y-axis direction support shaft 10 coupled to the X-direction support shaft 20 by using the Y-axis support shaft 60;
(40-1, 40'-1) are formed at both ends, and a central portion of the bracket (60) is connected to the connecting bracket (60) An X-axis direction support shaft 20 which is coupled to the Y-direction support shaft 20 by using the X-axis direction support shaft 20;
A plurality of connection support shafts 30, 30-1, 30-2, and 30-3 connected to the Y-axis direction support shaft 10 and the X-axis direction support shaft 20 by connection brackets 60-1;
A nut 55 is formed on the outer surface of the outer tube 52 and an insertion hole 53 is formed on both sides of the outer tube 52. The inner tube 54 is formed on both sides of the inner tube 54, The fixing bar 58 is inserted into the through holes 53 and 53 'and the fixed bar fixing holes 59 and 59' in a state where the inner pipe 54 is inserted into the inside of the outer pipe 52 59 and 59 'and the fixing bolt 56 formed with the handle 57 is fixed to the nut so that the lengths of the Y axis supporting shaft 10 and the X axis supporting shaft 20 are adjusted, And a control unit 50,
The external support bracket 200 includes a ring body 210 supporting an outer circumferential surface of the FRP pipe 300; A connecting bolt 220 connecting both ends of the ring body 210; And a plurality of support protrusions (230) formed on an outer peripheral surface of the ring body (210).
A plurality of inner support brackets 100 for supporting the inner circumferential surface of the FRP pipe 300 and a plurality of outer support brackets 200 for supporting the outer circumferential surface of the FRP pipe 300,
The inner support bracket 100 has a structure in which an inner tube and an outer tube are coupled to form a length adjusting part 50. Support parts 40 and 40 'are formed at both ends of the inner support bracket 100, A Y-axis direction support shaft 10 to which the X-direction support shaft 20 and the Z-direction support shaft 90 are coupled using the Y-axis support shaft 400;
(40-1, 40'-1) are formed at both ends, and a central portion of the support brackets (40-1, 40'-1) is connected to the connection bracket (400) An X-axis direction support shaft 20 to which the Y-direction support shaft 10 and the Z-direction support shaft 90 are coupled;
The Y-direction support shaft 10 and the X-direction support shaft 20 are coupled to each other using connection brackets 400 at both ends of the inner tube and the outer tube so that the length adjuster 50 can be formed. A Z-axis supporting shaft 90;
A plurality of connection support shafts 30, 30-1, 30-2, and 30-3 connected to the Y-axis direction support shaft 10 and the X-axis direction support shaft 20 by connection brackets 60-1;
A nut 55 is formed on the outer surface of the outer tube 52 and an insertion hole 53 is formed on both sides of the outer tube 52. The inner tube 54 is formed on both sides of the inner tube 54, The fixing bar 58 is inserted into the through holes 53 and 53 'and the fixed bar fixing holes 59 and 59' in a state where the inner pipe 54 is inserted into the inside of the outer pipe 52 59 and 59 'and the fixing bolt 56 formed with the handle 57 is fixed to the nut so that the lengths of the Y axis supporting shaft 10 and the X axis supporting shaft 20 are adjusted, A control unit 50;
The connecting bracket 400 is formed so that the X axis supporting shaft 20 can be inserted therein. Both the piping surfaces are coupled to each other by the hinge 412, and the bending protrusions 420 and 420 ' An X-axis pipe coupling part 410, 410 'having a plurality of bolt holes 422, 422' formed in the bending protrusions 420, 420 ';
Is attached to the outer peripheral surface of one side of the X axis pipe coupling portions 410 and 410 'and is formed such that the Y axis supporting shaft 10 can be inserted therein. Both pipe surfaces are coupled by a hinge 442, The Y-axis pipe coupling portions 440 and 440 (hereinafter, referred to as " Y-axis pipe coupling portions ") having bending protrusions 450 and 450 'formed at the upper end of the pipe surface, and having a plurality of bolt holes 452 and 452' formed in the bending protrusions 450 and 450 '');
And a Z axis pipe coupling part 430 attached to the other outer peripheral surface of the X axis pipe coupling parts 410 and 410 'and adapted to receive the Z axis support shaft 90,
The external support bracket 200 includes a ring body 210 supporting an outer circumferential surface of the FRP pipe 300; A connecting bolt 220 connecting both ends of the ring body 210; And a plurality of support protrusions (230) formed on an outer peripheral surface of the ring body (210).















KR1020180001614A 2018-01-05 2018-01-05 Bracket of frp pipe KR101864786B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57122725U (en) * 1981-01-22 1982-07-30
JP2003278985A (en) * 2002-03-26 2003-10-02 Osaka Gas Co Ltd Socket corotation preventive instrument
KR101462862B1 (en) * 2013-08-29 2014-11-18 주식회사 포스코 Correcting roundness apparatus
KR20150121587A (en) * 2014-04-21 2015-10-29 박상우 pipe structural joint enabling the support of roof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57122725U (en) * 1981-01-22 1982-07-30
JP2003278985A (en) * 2002-03-26 2003-10-02 Osaka Gas Co Ltd Socket corotation preventive instrument
KR101462862B1 (en) * 2013-08-29 2014-11-18 주식회사 포스코 Correcting roundness apparatus
KR20150121587A (en) * 2014-04-21 2015-10-29 박상우 pipe structural joint enabling the support of roof

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