Shimizu Construction Co., Ltd.

Yasukazu Nakamura

Yutaka Saito

Takanori Sato

Yasushi Watanabe

Yoshihiro Orito

Kenichi Ikeda

Toru Ito

Osamu Hosokawa

Seiho Kitagawa

Tomoo Shokawa

Hideyo Shiokawa

Hideo Nakajima

Takeshi Sano

Kazunori Koshida

Hideo Nakashima

A concrete filled steel tube column. The concrete filled steel tube column includes a steel tube having an inner face; a concrete core disposed within the steel tube; and a separating layer interposed between the inner face of the steel tube and the concrete core for separating the concrete core from the inner face of the steel tube so that the steel tube may not be bonded to the concrete core. After the separating layer is formed on the inner face of the steel tube, the concrete is charged into the steel tube to form a concrete core.

Structural filler filled steel tube column

A concrete filled tube column includes: an outer tube connected to beams of the structure, the outer tube consisting of a plurality of tube pieces coaxially disposed in series; a concrete core disposed within the outer tube; an inner flange peripherally mounted on the inner face of each tube piece; and a concrete layer peripherally disposed on the inner face of each tube piece. The concrete layer includes a tubular portion positioned under the inner flange and in direct contact with the entire lower side of the inner flange. The tubular portion has an inner peripheral face tapering upward so that the transverse inner size at the lower end of the tubular portion is equal to the transverse inner size of each tube piece. In constructing the column, a plurality of the precast structural tubes, each including: the tube piece; the inner flange; and the concrete layer, are prepared. Then, one of the precast tubes is erected. Concrete is placed within the erected precast tube to form a concrete core. The beams of the structure are connected to the erected precast structural tube. Another precast tube is coaxially connected to the upper end of the erected precast tube, whereby said another precast tube is erected on the lower adjoining structural tube. Thereafter, the steps from the concrete-placing step to the tube-connecting step are repeated a plurality of times.

Concrete filled tube column and method of constructing same

A concrete filled steel tube column which includes: a steel tube connected to beams of a structure so that an axial compressive load is transferred from the beams to the steel tube; and a concrete core, disposed within the steel tube, for bearing an axial compressive load transferred from the beams via the steel tube to the concrete core. The steel tube has a plurality of prestressed tube pieces concentrically joined in series. Each of these tube pieces has an axial prestress introduced into it to counteract a stress resulting from the compressive load applied to the steel tube. With this arrangement, substantially no axial stress is induced in the steel tube. In constructing the column, a steel tube piece is erected, and beams are joined to the tube piece. An axial tensile load is applied to the tube piece so that an axial stress is induced in the tube piece. After the application of the load, concrete is charged into the tube piece. After the concrete is cured, the tensile load is released from the tube piece so that the concrete core is subjected to an axial compression as a reaction to the application of an axial tension to the tube piece. Another tube piece is coaxially joined to an upper end of the concrete filled tube piece. Thereafter, the above-mentioned steps from the beam-joining step to the tube piece-joining step are repeated a plurality of times.

Concrete filled steel tube column and method of constructing same

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Tokyo, Japan

Yasukazu Nakamura