FIELD: building industry, particularly supply and industrial pipelines for heating and hot water delivery systems, gas and oil pipelines.
SUBSTANCE: combined tube has outer shell formed of cement containing material and inner shell formed of corrosion resistant steel. Adhesive layer on the basis of polymeric and/or crystalline hydrate and/or silicate or metal phosphate binding material having reinforcing filler is arranged between outer and inner shells. Relation between inner shell thickness and outer shell thickness is from 1:10 to 1:2000. Polymeric binding material is selected from polyester, epoxy, acrylate or polyurethane or silicone or formaldehyde resins, as well as of hot melt and latex adhesives. Crystalline hydrate binder is selected from magnesium sulfate or gypsum or cement. Metal annular tips are formed on ends of combined tube. Tips are non-detachably connected with inner non-impermeable shell and outer shell, which provide failsafe tube joint during pipeline assemblage.
EFFECT: improved chemical stability, strength and durability.
8 cl, 3 dwg
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