DE2842530A1 - GLASS FIBER REINFORCED PLASTIC PIPE - Google Patents
GLASS FIBER REINFORCED PLASTIC PIPEInfo
- Publication number
- DE2842530A1 DE2842530A1 DE19782842530 DE2842530A DE2842530A1 DE 2842530 A1 DE2842530 A1 DE 2842530A1 DE 19782842530 DE19782842530 DE 19782842530 DE 2842530 A DE2842530 A DE 2842530A DE 2842530 A1 DE2842530 A1 DE 2842530A1
- Authority
- DE
- Germany
- Prior art keywords
- pipe
- glass fiber
- reinforced plastic
- amount
- fiber reinforced
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
- F16L9/133—Rigid pipes of plastics with or without reinforcement the walls consisting of two layers
Description
Case 37-11360 DeutschlandCase 37-11360 Germany
CIBA-GEiGYCIBA-GEiGY
Π. ε F. H '; γ . π ■Π. ε F. H '; γ. π ■
Wi.' H Cn ι-, ν υ'ι . > . -'.,'.'.' Wi. ' H Cn ι-, ν υ'ι . >. - '.,'. '.'
■"■•Ι- ->· .. if.(.HLri3T.|. ^i■ "■ • Ι- -> · .. if. (. HLri3T. |. ^ I
197-197-
Glasfaserverstärktes KunststoffrohrGlass fiber reinforced plastic pipe
Die Erfindung betrifft ein glasfaserverstärktes Kunststoffrohr mit einer ersten Rohrschicht, in der die Glasfasern angenähert in Umfangsrichtung verlaufen, und einer zweiten Rohrschicht, in der die Glasfasern angenähert parallel zur Rohrachse orientiert sind.The invention relates to a glass fiber reinforced plastic pipe with a first pipe layer in which the Glass fibers run approximately in the circumferential direction, and a second pipe layer in which the glass fibers are oriented approximately parallel to the pipe axis.
Beim Konzipieren von GFK-Rohren ist in der Vergangenheit kaum beachtet worden, dass die Art der InstallationIn the past, when designing GRP pipes, little attention was paid to the type of installation
aO9814/1057aO9814 / 1057
erheblich Einfluss auf die in Längsrichtung auftretenden ("axialen") Kräfte im Rohr haben kann. Man ging bisher davon aus, dass jedes Rohr für eine Axialspannung C. auszulegen sei, die halb so gross wie die vom Innendruck verursachte Umfangsspannung (T ist.can have a considerable influence on the longitudinal ("axial") forces in the pipe. It was previously assumed that every pipe was to be designed for an axial stress C. that is half the size of the hoop stress caused by the internal pressure (T.
Ueberraschenderweise wurde nun gefunden, dass diese Ueberlegungen für in Pipelines einzusetzende GFK-Rohre nicht zutrifft und sich die auftretende Axialspannung C^ erheblich reduzieren lässt, wenn gemäss der Erfindung die Glasfasermenge in der zweiten Rohrschicht weniger als 20% der Gesamtglasfasermenge des Rohrs beträgt.Surprisingly, it has now been found that these considerations do not apply to GRP pipes to be used in pipelines and that the axial stress C ^ occurring can be reduced considerably if, according to the invention, the amount of glass fiber in the second pipe layer is less than 20% of the total amount of glass fiber in the pipe.
Die Erfindung basiert auf der Überraschenden Erkenntnis, dass die Axialspannung durch "Wegnehmen" von axial orientierten Glasfasern abnimmt. In der Praxis beträgtThe invention is based on the surprising finding that the axial tension by "removing" axial oriented glass fibers decreases. In practice it amounts to
die Menge der axialen Glasfasern etwa 30-10%,vorzugsweise etwa 20-10% der Gesamtglasfasermenge. Die Orientierung der Fasern in den beiden Schichten bezüglich der Rohrachse ist *8O-88° bzw. *2-10°, vorzugsweise etwa *85° bzw. *5°.the amount of the axial glass fibers about 30-10%, preferably about 20-10% of the total amount of glass fiber. The orientation of the fibers in the two layers with respect to the tube axis is * 80-88 ° or * 2-10 °, preferably about * 85 ° or * 5 °.
Durch die Through the
Wahl der Faserorientierung kann man die Querkontraktions- zahl VUA in weiten Grenzen variieren. So wurde (bei einem Harz-Elastizitätsmodul von 3000 N/mm und einem Glasvolumenanteil von 60%) für ein 0°/90°-Rohr mit 10% der Fasern in Achsenrichtung eine Querkontraktionszahl VA= 0,09 gefunden, während ein + 55°-Rohr eine Querkontraktions zahl VUA = 0,45 aufweist. Ebenso wie sich When choosing the fiber orientation, the Poisson's ratio V UA can be varied within wide limits. Thus (with a resin modulus of elasticity of 3000 N / mm and a glass volume fraction of 60%) for a 0 ° / 90 ° pipe with 10% of the fibers in the axial direction, a Poisson's ratio V A = 0.09 , while a + 55 ° pipe has a Poisson's ratio V UA = 0.45. As well as yourself
909814/1057909814/1057
diese Querkontraktionszahlen bei- den erfindungsgemässen Rohren etwa um den Faktor 5 gegenüber herkömmlichen Rohren unterscheiden, unterscheiden sich auch die bei gleichem Innendruck auftretenden Axialspannung 6^. um den Faktor 5.These transverse contraction numbers of the two pipes according to the invention differ approximately by a factor of 5 compared to conventional pipes, and the axial stress 6 ^ which occurs at the same internal pressure also differs. by a factor of 5.
Die Herabsetzung der auftretenden Axialspannung ist insbesondere im Zusammenhang mit den bei Pipelines unvermeidbaren Rohrverbindungen von Bedeutung» Mit abnehmender Axialspannung sinkt nämlich auch die Belastung, für welche die Rohrverbindungen ausgelegt werden müssen. Bei Einsatz erfindungsgemässer GFK-Rohre, bei denen sich Querkontraktionszahlen bis hinab zu etwa 0,1 erreichen lassen, (was (F. =0,1 0"! zur Folge hat), müssen die Rohrverbindungen nur für ein Fünftel der Lasten dimensioniert werden, die bisher aufgrund der Beziehung (T. =0,5 Ck, veranschlagt wurden. Da man es bei Pipelines mit hohen Drucken zu tun hat, schafft das erfindungsgemässe Rohr diesbezüglich eine erhebliche Erleichterung.The reduction in the axial stress that occurs is particularly unavoidable in connection with pipelines Pipe connections of importance »With decreasing axial tension, the load also decreases, for which the pipe connections must be designed. When using GRP pipes according to the invention, which have Poisson's ratios down to about 0.1 can be achieved (which results in (F. = 0.1 0 "!), need the pipe connections only for a fifth of the Loads are dimensioned that were previously estimated on the basis of the relationship (T. = 0.5 Ck. Since one it has to do with high pressures in pipelines, the pipe according to the invention creates a considerable amount in this regard Relief.
Bei Rohren mit mehr als zwei Schichten gilt selbstverständlich, dass die Menge aller in Längsrichtung orientierten Glasfasern weniger als 30% der Menge aller Glasfasern in Umfangsrichtung beträgt.In the case of pipes with more than two layers, it goes without saying that the amount of all is oriented in the longitudinal direction Glass fibers is less than 30% of the amount of all glass fibers in the circumferential direction.
9098U/10579098U / 1057
Claims (4)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1205077A CH623909A5 (en) | 1977-10-03 | 1977-10-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2842530A1 true DE2842530A1 (en) | 1979-04-05 |
Family
ID=4379379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19782842530 Withdrawn DE2842530A1 (en) | 1977-10-03 | 1978-09-29 | GLASS FIBER REINFORCED PLASTIC PIPE |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPS5461280A (en) |
CA (1) | CA1099223A (en) |
CH (1) | CH623909A5 (en) |
DE (1) | DE2842530A1 (en) |
FR (1) | FR2404791A1 (en) |
GB (1) | GB2005377B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3432907A1 (en) * | 1984-09-07 | 1986-06-19 | Alfred Prof. Dr.-Ing. 3524 Immenhausen Puck | METHOD FOR ACHIEVING HIGH CRACKING LIMITS IN A LONG-SLEEVED HOLLOW BODY |
US4836715A (en) * | 1987-02-11 | 1989-06-06 | Insituform International N.V. | Passageway lining material |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT380089B (en) * | 1984-04-11 | 1986-04-10 | Hobas Durotec Rohre Ges M B H | TUBE MADE OF FIBER REINFORCED, CURABLE PLASTIC, METHOD FOR PRODUCING THE SAME AND DEVICE FOR IMPLEMENTING THE METHOD |
BE1008712A3 (en) * | 1994-07-20 | 1996-07-02 | Solvay | Composite article and method of making. |
BE1008406A3 (en) * | 1994-07-20 | 1996-05-07 | Polva Pipelife Bv | Composite pipe and method for manufacturing. |
JP6546433B2 (en) * | 2015-04-03 | 2019-07-17 | 積水化学工業株式会社 | Multilayer piping |
JP6595787B2 (en) * | 2015-04-03 | 2019-10-23 | 積水化学工業株式会社 | Multilayer piping |
-
1977
- 1977-10-03 CH CH1205077A patent/CH623909A5/de not_active IP Right Cessation
-
1978
- 1978-09-29 DE DE19782842530 patent/DE2842530A1/en not_active Withdrawn
- 1978-10-02 FR FR7828129A patent/FR2404791A1/en not_active Withdrawn
- 1978-10-03 GB GB7839162A patent/GB2005377B/en not_active Expired
- 1978-10-03 JP JP12127678A patent/JPS5461280A/en active Pending
- 1978-10-03 CA CA312,544A patent/CA1099223A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3432907A1 (en) * | 1984-09-07 | 1986-06-19 | Alfred Prof. Dr.-Ing. 3524 Immenhausen Puck | METHOD FOR ACHIEVING HIGH CRACKING LIMITS IN A LONG-SLEEVED HOLLOW BODY |
US4836715A (en) * | 1987-02-11 | 1989-06-06 | Insituform International N.V. | Passageway lining material |
Also Published As
Publication number | Publication date |
---|---|
GB2005377A (en) | 1979-04-19 |
CH623909A5 (en) | 1981-06-30 |
FR2404791A1 (en) | 1979-04-27 |
CA1099223A (en) | 1981-04-14 |
JPS5461280A (en) | 1979-05-17 |
GB2005377B (en) | 1982-04-07 |
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Legal Events
Date | Code | Title | Description |
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8130 | Withdrawal |