SE408666B

SE408666B - REINFORCED BITUMEN RODS AND SEEN TO MANUFACTURE

Info

Publication number: SE408666B
Application number: SE7712369A
Authority: SE
Inventors: S O M Ekstrom
Original assignee: Ekstrom & Co H A B
Priority date: 1977-11-02
Filing date: 1977-11-02
Publication date: 1979-06-25
Also published as: SE7712369L

Description

77,1 236943 2 en dorn, som beklätts med ett släppskikt, och det kännetecknande för uppfinningen är, att varm bitumenmassa utbredes på den med släpp- skikt beklädda dornen till bildande av ett inre bitumenskikt, på vil-- ket ett glasfiberskikt påföres och vilket därvid bringas att partiellt intränga i glasfiberskiktet utan att genomtränga detta, och att ett armerat härdplastskikt successivt uppbygges utanpå glasfiberskiktet och därvid bringas att partiellt intränga i detta utan att tränga fram till bitumenskiktet, varefter härdplastskiktet härdas och efter härdningen belägges med ett yttre bitumenskikt, som på sin utsida företrädesvis belägges med ett strömaterial. Vid detta förfarings- sätt är det föredraget att man vid uppbyggnaden av det armerade härd- plastskiktet på glasfiberskiktets utsida först påför ett gelcoat-' skikt, på vars utsida härdplastskiktet sedan successivt bygges upp genom successiv påföring av plast- och armeringsskikt till erforder- lig styrka. Det yttre bitumenskiktet påföres företrädesvis först ef- ter det att en viss efterhärdningstid förflutit efter plastskiktets härdning, för att huvudparten av i härdningsreaktionen icke delta- gande ämnen skall ha hunnit avgå före påföringen av det yttre bitu- menskiktet. Det yttre bitumenskiktet bringas företrädesvis omsluta även rörets ringformiga ändytor, så att glasfiberskiktet och härd- plastskikten är helt omslutna av bitumen. A mandrel coated with a release layer, and the characteristic of the invention is that hot bitumen mass is spread on the release layer coated with a release layer to form an inner bitumen layer, on which a glass fiber layer is applied and which thereby causing partial penetration into the glass fiber layer without penetrating it, and that a reinforced thermoset layer is successively built up on top of the glass fiber layer and thereby caused to partially penetrate it without penetrating the bitumen layer, after which the thermosetting plastic layer is cured and after curing is coated with an outer bitumen layer. its outside is preferably coated with a spreading material. In this method, it is preferred that in the construction of the reinforced thermoset layer on the outside of the glass fiber layer, a gelcoat layer is first applied, on the outside of which the thermoset layer is then successively built up by successively applying plastic and reinforcement layers to the required strength. . The outer bitumen layer is preferably applied only after a certain post-curing time has elapsed after the curing of the plastic layer, so that the majority of substances not participating in the curing reaction have had time to escape before the application of the outer bitumen layer. The outer bitumen layer is preferably also enclosed in the annular end surfaces of the pipe, so that the glass fiber layer and the thermosetting plastic layers are completely enclosed by bitumen.

Uppfinningen bygger på den insikten, att bitumen är ett ämne, som tål såväl marksyror som de vätskor, som förväntas strömma inuti rören. Bitumenet självt har emellertid otillräcklig styrka för att kunna utformas till rör med erforderlig hållfasthet, särskilt tryck- hållfasthet. Försök att utanpå det inre bitumenskiktet direkt påfö- ra ett härdplastskikt har emellertid misslyckats, eftersom de i den ännu icke härdade härdplasten ingående ämnena vandrat in i bitumenet och modifierat bitumenets egenskaper varvid dålig vidhäftning bli- vit resultatet. Enligt uppfinningen utnyttjas därför ett förhållan- devis tjockt glasfiberskikt såsom "isolation" och bindeskikt mellan det inre bitumenskiktet och det utanpå detta successivt uppbyggda härdplastskiktet. På utsidan föreligger emellertid icke samma problem vid påföringen av bitumenet, eftersom beläggningen med det yttre bi- tumenskiktet kan ske efter en tillräcklig tid för att huvudparten av icke reagerade komponenter i härdplastutgångsmaterialen skall ha avgått. Efter beläggningen med det yttre bitumenskiktet och påföring-' en av strömaterial utanpå detta, har man ett armerat bitumenrör, som uppvisar bitumenets alla fördelar jämsides med härdplastens styrka.The invention is based on the insight that bitumen is a substance that can withstand both soil acids and the liquids that are expected to flow inside the pipes. However, the bitumen itself has insufficient strength to be able to be formed into pipes with the required strength, especially compressive strength. Attempts to directly apply a thermoset layer to the inner bitumen layer have failed, however, because the substances contained in the not yet hardened thermoset have migrated into the bitumen and modified the properties of the bitumen, resulting in poor adhesion. According to the invention, therefore, a relatively thick glass fiber layer is used as an "insulation" and a bonding layer between the inner bitumen layer and the thermosetting plastic layer which is successively built up on the outside. On the outside, however, there is not the same problem in the application of the bitumen, since the coating with the outer bitumen layer can take place after a sufficient time for the majority of unreacted components in the thermosetting plastic starting materials to have departed. After the coating with the outer bitumen layer and the application of spreading material on top of it, there is a reinforced bitumen pipe, which has all the advantages of bitumen along with the strength of the thermosetting plastic.

I Såsom strömaterial på det yttre bitumenskiktets utsida kan man använda krossat stenmaterial, talk eller dylikt. 3 ~vv12ss9-3 Vid ett utföringsexempel på uppfinningen utnyttjades en dorn med en diameter av 20 cm. Dornen bekläddes först med ett släppskikt, som kunde tåla värme upp till ca 230°C och som utgjordes av en polyester- film eller nylonfilm med en tjocklek av 0,10 mm. Utanpå släppskik- tet påfördes sedan ett bitumenskikt med en tjocklek av 2-3 mm. Detta bitumenskikt bildades genom sammanblandning av två asfalttyper, näm- iigen voæ Nynäs 9330 (xoR-smäupunkt 93%, penetration 30 mm/io vid 25°C) och 30% gilsonit, varvid asfalt- eller bitumenblandningen hade KoR-smältpunkten 105-ll0°C och penetrationen ll-13 mm/10 vid 25°C.As spreading material on the outside of the outer bitumen layer, crushed stone material, talc or the like can be used. 3 ~ vv12ss9-3 In an exemplary embodiment of the invention, a mandrel with a diameter of 20 cm was used. The mandrel was first coated with a release liner, which could withstand heat up to about 230 ° C and which consisted of a polyester film or nylon film with a thickness of 0.10 mm. A bitumen layer with a thickness of 2-3 mm was then applied to the outside of the release layer. This bitumen layer was formed by mixing two types of asphalt, namely voyn Nynäs 9330 (xoR melting point 93%, penetration 30 mm / 10 at 25 ° C) and 30% gilsonite, the asphalt or bitumen mixture having the KoR melting point 105-110 ° C and the penetration ll-13 mm / 10 at 25 ° C.

Vid påföringen hade asfalt- eller bitumenblandningen temperaturen l80°C. Medan det inre bitumenskiktet var mjukt (dvs smält till halv- smält) påfördes ett skikt glasrovingväv, som pressades ner ca 30% i bitumenskiktet. Glasrovingväven var tätt vävd och hade en tjocklek av 0,7-0,8 mm, så att det tjockflytande, smälta till halvsmälta bitume- net icke kunde tränga genom glasrovingväven. Härefter tilläts bitume- net stelna (fick svalna ca 5 min) till en temperatur under lO0°C.At the time of application, the asphalt or bitumen mixture had a temperature of 180 ° C. While the inner bitumen layer was soft (ie molten to semi-molten), a layer of glass roving fabric was applied, which was pressed down about 30% into the bitumen layer. The glass roving fabric was tightly woven and had a thickness of 0.7-0.8 mm, so that the thick, molten to semi-molten bitumen could not penetrate the glass roving fabric. The bitumen was then allowed to solidify (allowed to cool for about 5 minutes) to a temperature below 10 ° C.

Härefter påfördes ett skikt polyesterbaserad, styrenhaltig gelcoat, som var krämartad och hade en sådan viskositet, att den inte kunde tränga genom glasrovingväven. Såsom gelcoat kan utnyttjas LAMELLON 2670, som är en lågviskös, något tixotrop polyester, som i flytande tillstånd har en viskositet av 3-4 P vid 20°C och som kan komponeras för att få en gelningstid av 5-7 min och en härdningstid av l0-20 min.Then a layer of polyester-based, styrene-containing gelcoat was applied, which was creamy and had such a viscosity that it could not penetrate the glass roving fabric. As the gelcoat, LAMELLON 2670 can be used, which is a low-viscosity, slightly thixotropic polyester, which in the liquid state has a viscosity of 3-4 P at 20 ° C and which can be composed to have a gel time of 5-7 minutes and a curing time of l0-20 min.

Utanpå gelcoatskiktet byggdes successivt upp ett laminat av polyes- terskikt och glasfiberskikt, tills erforderligt antal glasfiberskikt och erforderlig styrka erhållits. Härefter härdades laminatet, som efter härdningen fick ligga några dygn för utandning av i plasten in- gående styren. Härefter drogs det halvfärdiga röret av från dornen, varvid släppskiktet också avlägsnades. Utsidan av det halvfärdiga rö- _ret belades med en ny sats bitumen i en tjocklek av 2-3 mm, varvid även de ringformiga ändytorna av röret överdrogs. Slutligen påfördes på utsidan talk, sand eller något annat strömaterial för att röret skulle bli hanterbart.On the outside of the gelcoat layer, a laminate of polyester layer and fiberglass layer was gradually built up, until the required number of fiberglass layers and the required strength were obtained. The laminate was then cured, which after curing was allowed to lie for a few days before exhaling the styrene included in the plastic. Thereafter, the semi-finished pipe was pulled off from the mandrel, whereby the release layer was also removed. The outside of the semi-finished pipe was coated with a new batch of bitumen in a thickness of 2-3 mm, whereby also the annular end surfaces of the pipe were coated. Finally, talc, sand or other spreading material was applied to the outside to make the pipe manageable.

Det inre bitumenskiktet kan eventuellt armeras med en egen glas- fiberväv, som härvid helt genomdränkes av bitumenet och som kan ut- göras av en rutväv med en vikt av 200 g/m2. Den glasfiberväv, som lägges mellan det inre bitumenskiktet och härdplastskiktet och som företrädesvis utgöres av en tätvävd glasrovingväv, har företrädesvis en vikt av 780 g/m2, vilket motsvarar en tjocklek av ca 1,2 mm.The inner bitumen layer can optionally be reinforced with its own glass fiber fabric, which in this case is completely soaked by the bitumen and which can consist of a checkerboard fabric with a weight of 200 g / m2. The glass fiber fabric, which is laid between the inner bitumen layer and the thermoset layer and which preferably consists of a tightly woven glass roving fabric, preferably has a weight of 780 g / m 2, which corresponds to a thickness of about 1.2 mm.

Antalet armeringsskikt i härdplastskiktet är företrädesvis minst 3, och härdplastskiktet dimensioneras allt efter rörens avsedda tryck-The number of reinforcing layers in the thermoset layer is preferably at least 3, and the thermoset layer is dimensioned according to the intended pressure of the pipes.

Claims

7712369-3 4th class. A pipe in the dimension 500 mm for 10 kg working pressure should thus, for example, have 6-7 reinforcement layers in the thermosetting plastic layer. As a reinforcing layer in the thermosetting plastic, it is possible to use glass fiber fabric, which is formed by glass roving and which has a tensile strength of about 325 kg / cm. The fabric can have a weight of 780 g / m2 and can be wound as a napkin, ie helical along the tube. The same application method can be used for applying the glass fiber layer serving as a separating and bonding layer between bitumen and thermosetting plastic layer. The winding can in this case take place under a certain tensile force in order to stretch the glass fiber layer and cause it to partially penetrate into the substrate. The reinforced bitumen pipe according to the invention can have the shape of sleeve pipes or smooth pipes but can also be designed as pipe bends, T-pipes and pipes of many other shapes. In these cases, of course, mandrels of a corresponding shape may be used. PATENT REQUIREMENTS

1. l. Reinforced bitumen pipe, characterized in that it has an insulating glass fiber layer, which on its inside is connected to an inner layer partially penetrated in the glass fiber layer, which has an inner layer formed of bitumen and which on its outside is connected to a pair of penetrating but not penetrating to the bitumen layer, consisting of reinforced thermosetting plastic, reinforcing layer, the reinforcing layer being lined on its outside with an outer bitumen layer, which may have an outer coating of spreading material.

Tube according to claim 1, characterized in that the glass fiber layer is a tightly woven glass roving fabric.

Tube according to Claim 1 or 2, characterized in that the reinforcing layer consists of reinforced polyester.

4. A pipe according to claim 1, 2 or 3, characterized in that the inner bitumen layer is reinforced with a glass fiber layer completely soaked with the bitumen.

A method of manufacturing a reinforced bitumen pipe according to claim 1, in which the pipe is successively built up on a mandrel, which is coated with a release layer, characterized in that hot bitumen mass is spread on the release-coated mandrel to form an inner bitumen layer. , on which a glass fiber layer is applied and vil- f; Bitumen layer is thereby caused to partially penetrate the glass fiber layer without penetrating it, and that a reinforced thermoset layer is successively built up on the outside of the fiber layer and thereby caused to partially penetrate therein without penetrating to the bitumen layer, after which the thermoset layer cured and after curing is coated with an outer bitumen layer, which on its outside is preferably coated with a spreading material.

6. A method according to claim 5, characterized in that the glass fiber layer is applied by a tightly woven glass roving fabric under tension being wound helically on the outside of the still hot and plastic inner bitumen layer.

7. A method according to claim 5 or 6, characterized in that the outside of the glass fiber layer in the construction of the reinforced thermoset layer is first coated with a gelcoat layer, whereupon the thermoset layer is gradually built up with plastic and reinforcement layers to the required strength.

8. A method according to claim 5, 6 or 7, characterized in that the outer bitumen layer is applied only after a certain post-curing time has elapsed after the curing of the plastic layer.

9. A method according to any one of claims 5-8, characterized in that the outer bitumen layer is also made to enclose the annular end surfaces of the pipe.

10. A method according to any one of claims 5-9, characterized in that the inner bitumen layer is reinforced with a glass fiber layer completely impregnated with bitumen, preferably a diamond fabric. BEFORE PUBLICATIONS: 'Sweden 391 795