Pacific Metals Co., Ltd.

Takeshi Fukushima

Yoshihiro Ikegami

Kiyoshi Sakagami

A method for producing concrete in a multi-layer pan type mixer comprising upper and lower mixers having upper and lower mixing tanks driven by separate motors and a discharge gate communicating the upper mixing tank with the lower mixing tank, said method comprising supplying sand, cement and primary mixing water to the upper mixing tank and performing primary mixing therein to obtain a mortar, discharging the mortar into the lower mixing tank, simultaneously supplying gravel and secondary mixing water to the lower mixing tank to disperse the gravel into the mortar, and performing secondary mixing therein.

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Ichikawashi, Japan

Takeshi Fukushima