CH212492A - Process for the production of asbestos-cement coatings for steel pipes. - Google Patents

Process for the production of asbestos-cement coatings for steel pipes.

Info

Publication number
CH212492A
CH212492A CH212492DA CH212492A CH 212492 A CH212492 A CH 212492A CH 212492D A CH212492D A CH 212492DA CH 212492 A CH212492 A CH 212492A
Authority
CH
Switzerland
Prior art keywords
asbestos
cement
steel pipes
production
pipe
Prior art date
Application number
Other languages
German (de)
Inventor
Mannesmannroehren-Werke
Original Assignee
Mannesmann Ag
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mannesmann Ag filed Critical Mannesmann Ag
Publication of CH212492A publication Critical patent/CH212492A/en

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
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/06—Coatings characterised by the materials used by cement, concrete, or the like

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paints Or Removers (AREA)

Description

  

  Verfahren zur Herstellung von     Asbest-Zement-Umhüllungen    von Stahlrohren.    Die Isolierung von Stahlrohren mit  Asbest-Zement hat den grossen Vorteil, dass  diese Umhüllung sehr fest wird und dass da  durch die     Aussenbewicklung    eine grosse     Stoss-          und    Schlagfestigkeit besitzt.  



  Leider ist der     verwandte        Asbest-Zement     wasserdurchlässig, so dass Feuchtigkeit an  die äussere Rohrwand dringen kann und bei  vagabundierenden Strömen oder bei stark  aggressiven Grundwassern die Rohre ange  griffen werden. Um diese Mängel aufzu  heben, hat man     bereits    vorgeschlagen, die  äussere Rohroberfläche zuerst mit einem       Bitumenüberzug    zu schützen und darüber die       Asbest-Zementhülle    aufzubringen.  



  Da jedoch in diesem Falle der starre  Asbest-Zement auf dem weichen Bitumen  liegt, wird die     Stosss2cherheit    der Isolierung  erheblich gemindert und ausserdem wird die  betreffende Isolierung sehr teuer. Die Auf  bringung der beschriebenen     Asbest-Zement-          hiille    geschieht derart, dass ein Brei aus  Asbest-Zement und Wasser auf das Rohr  aufgetragen wird. Erst     wenn    der Asbest-    Zement an     feuchter    Luft     vollständig    abge  bunden hat, erreicht der Schutz seine grosse  Festigkeit.

      Gemäss der     Erfindung    werden die ge  schilderten     Nachteile    der beschriebenen Iso  lierung dadurch vermieden, dass einem       Asbest-Zement-Wassergemisch    eine zur  Porenausfüllung ausreichende Menge eines       härtbaren        Kunstharzpulvers,    vorzugsweise  mit niedrigem Schmelzpunkt (z.

   B. 50 bis  <B>70'),</B>     beigemengt        wird,    das Rohr mit der  Mischung umhüllt und nach     der        Abbindung     in feuchter Luft oder     unter    Wasser in luft  trockenem Zustand so erwärmt wird, dass das  Kunstharz, bevor es in den     unschmelzbaren     und unlöslichen Zustand übergeht, flüssig       wird    und die Poren des     Asbest-Zements    ver  stopft.

      Durch die     Verstopfung    der Poren ist  nach der     Erhärtung    des Kunstharzes der  Asbest-Zement nicht nur absolut dicht,  sondern auch     korrosionsbeständig,.    da ge  härtete Kunstharze - wie an sich     bekannt-,.         zu den korrosionsbeständigsten Stoffen ge  hören.  



  Die Menge des verwendeten Kunstharzes  wird zweckmässig nur so gross gewählt, dass  mit Sicherheit die Poren ausgefüllt werden.



  Process for the production of asbestos-cement coatings for steel pipes. The insulation of steel pipes with asbestos cement has the great advantage that this covering becomes very strong and that the external wrapping has great shock and impact resistance.



  Unfortunately, the asbestos cement used is permeable to water, so that moisture can penetrate the outer pipe wall and the pipes are attacked in the case of stray currents or in the case of highly aggressive groundwater. In order to resolve these deficiencies, it has already been proposed to first protect the outer pipe surface with a bitumen coating and then to apply the asbestos-cement coating.



  However, since the rigid asbestos-cement lies on the soft bitumen in this case, the impact resistance of the insulation is considerably reduced and the insulation in question is also very expensive. The asbestos-cement sheath described is applied in such a way that a slurry of asbestos-cement and water is applied to the pipe. Only when the asbestos cement has completely set in moist air does the protection achieve its great strength.

      According to the invention, the disadvantages of the described insulation are avoided by adding a hardenable synthetic resin powder, preferably with a low melting point (e.g.

   B. 50 to <B> 70 '), </B> is added, the pipe is coated with the mixture and after setting in moist air or under water in a dry air state is heated so that the synthetic resin before it in the infusible and insoluble state, becomes liquid and clogs the pores of the asbestos cement.

      Due to the clogging of the pores after the hardening of the synthetic resin, the asbestos cement is not only absolutely impermeable, but also corrosion-resistant. since hardened synthetic resins - as known per se-. belong to the most corrosion-resistant materials.



  The amount of synthetic resin used is expediently chosen only so large that the pores are definitely filled.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung von Asbest Zementumhüllungen von Stahlrohren, da durch gekennzeichnet, dass einem Asbest- Zement-Wassergemisch eine zur Porenaus füllung ausreichende Menge eines härtbaren Kunstharzpulvers beigemengt wird, das Rohr mit der Mischung umhüllt und nach der Abbindung in Gegenwart von Feuchtigkeit im lufttrockenen Zustand so erwärmt wird, dass das Kunstharz, bevor es in den un- schmelzbaren und unlöslichen Zustand über geht, PATENT CLAIM: Process for the production of asbestos-cement coatings for steel pipes, characterized in that an asbestos-cement-water mixture is mixed with a sufficient amount of a hardenable synthetic resin powder to fill the pores, the pipe is coated with the mixture and, after setting, in the presence of moisture in the air-dry State is heated in such a way that the synthetic resin, before it changes to the infusible and insoluble state, flüssig wird und die Poren des Asbest- Zementes verstopft. UNTERANSPRtrCHE: 1. Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass die Abbindung der Umhüllung des Rohres in feuchter Luft erfolgt. ?. Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass die Abbindung der Umhüllung des Rohres in Wasser erfolgl. becomes liquid and clogs the pores of the asbestos cement. SUBClaims: 1. Method according to claim, characterized in that the setting of the casing of the pipe takes place in moist air. ?. Method according to patent claim, characterized in that the sheathing of the pipe is tied in water.
CH212492D 1939-02-08 1939-02-08 Process for the production of asbestos-cement coatings for steel pipes. CH212492A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH212492T 1939-02-08

Publications (1)

Publication Number Publication Date
CH212492A true CH212492A (en) 1940-11-30

Family

ID=4447829

Family Applications (1)

Application Number Title Priority Date Filing Date
CH212492D CH212492A (en) 1939-02-08 1939-02-08 Process for the production of asbestos-cement coatings for steel pipes.

Country Status (1)

Country Link
CH (1) CH212492A (en)

Similar Documents

Publication Publication Date Title
US2120309A (en) Method of applying noncorrosive surfaces to pipe and the like
DE2035265A1 (en) Stone wood construction panel and process for its manufacture
CH212492A (en) Process for the production of asbestos-cement coatings for steel pipes.
DE2743259A1 (en) METHOD FOR PRODUCING A PROTECTIVE LAYER ON PIPES
DE763199C (en) Process for the production of asbestos-cement casings for steel pipes
DE2528495C2 (en) Use of a highly colloidal water-cement mixture with added additives
US1964987A (en) Process of constructing bituminous macadam roads
CH502280A (en) Plaster compositions contng organic polymers
DE1634565A1 (en) Process for the consolidation and sealing of non-compact materials, especially water-bearing earth masses by injection and devices for carrying out the same
DE409965C (en) Process for the production of construction or insulating bodies from corrugated cardboard
DE701175C (en) Coating layer for the inner wall of iron hollow bodies, especially pipes
DE1658548C3 (en) Method for sealing a joint in structures made of cement concrete, in particular in road pavements, and sealing strip for forming and sealing a joint
CH616173A5 (en) Insulating and encapsulation composition for pipelines
US1465448A (en) Grouting composition for paving blocks
DE949264C (en) Process for the elimination or prevention of sooting of masonry
DE719732C (en) Process for the production of concrete bodies
DE2260488C3 (en) Using a concrete mix to spray concrete pipes into pipe formwork
CH418752A (en) Process for the production of corrosion-resistant inner-outer layers on concrete pipes
DE855842C (en) Method for grouting acid-resistant panel linings
DE3625055A1 (en) Process for prevention of cracks in cement-bonded floors
US1677272A (en) Process of mixing metallic salt in asphaltic compounds
AT127245B (en) Sealing material for socket pipes.
DE2319535A1 (en) Crack-bridging, insulating flooring system
DE673404C (en) Method of lining the inner wall of reinforced concrete tanks
DE972585C (en) Process for the treatment of containers lined with stone or coal stone materials using self-hardening putty, in particular in chemical engineering