Sumitomo Electric Industries, Limited

Toshiro Hirohata

Akira Nishimura

Chiaki Kato

Takashi Yoshioka

Yoshihiko Touda

Takashi Takagaki

Yasuji Ohgaki

Kouji Kiyosu

Masahiro Habuka

A curable composition applied to the surface of a tendon for prestressed concrete contains at least an epoxy resin and a moisture-curing type curing agent. In the curable composition, the tensioning-permitting time L at 90&deg; C. is at least 20 hours, and the number of days M required to cure at normal temperature is at most 1095 days. The curable composition for tendons for prestressed concrete according to the present invention permits complete prevention of corrosion without conducting injection of a grout into a sheath and can be used even when the curable composition is heated to a high temperature by heat generated upon hardening of concrete.

Curable composition for tendon for prestressed concrete and tendon

A tubular object manufacturing method comprising the steps of applying liquid heat-resistant resin containing an inorganic filler as desired onto an outer surface or inner surface of a core member which is a shaping mold to thereby form a coating layer, solidifying or hardening the applied liquid heat-resistant resin until the coating layer becomes strong enough to maintain at least a structure of the tubular object, and taking the tubular object out from the core member. In the method, liquid heat-resistant resin with a viscosity of 10 to 15000 poise at 25.degree. C. is continuously fed by means of a dispenser onto the outer surface or inner surface of the core member while rotating the core member, and a feeder part of the dispenser is moved in the direction of a rotation axis of the core member so that the fed liquid heat-resistant resin is helically wound to thereby form the coating layer. Tubular objects obtained by the manufacturing method is excellent in thickness precision, less in resin loss, and capable of being given desired thickness distribution in the axial direction as necessary.

Tubular object manufacturing method

Growing community of inventors

Osaka, Japan

Toshiro Hirohata