To rationalize manufacture of a concrete molding and to reduce its cost.
For example, when an oblique wall pipe 1 constituting an assembled manhole is made into a concrete molded article, a form for molding the oblique wall pipe 1 is placed on a pallet 4 and while this pallet 4 is carried by a first carrying member D a third carrying member F, a secondary concrete prepd. by incorporating an ingredient forming ettringite at high temp. and kneading them is fed into a form at a concrete feeding part A and molding is performed by a centrifugal molding process or a vibration molding process and the molded article is passed through a curing room 18 formed into a tunnel shape at a curing part B and is cured there and the oblique wall pipe 1 is exposed at a demolding part C by dividedly demolding the outer form from the form. The oblique wall pipe 1 is discharged by a discharging conveyer 26 and the form is assembled again on the pallet 4 and is carried to a concrete feeding part A through the third carrying member F.
MURASE MASARU
WATANABE MIKIO
