Nippon Steel Sumitomo Metal Corporation

Shinji Taenaka

Yoshiaki Oikawa

Yuki Motegi

Takashi Oosawa

Ryoichi Kanno

Tetsu Satoh

Ryuuta Tanaka

Masahide Takagi

Masataka Tatsuta

Tatsuaki Kurosawa

Nishiumi Kenji

Miura Yousuke

Tatsuta Masataka

Maeda Humitaka

Eda Kazuhiko

Kazuhiko Eda

Yousuke Miura

Kenji Nishiumi

This depression-provided steel pipe has plural depressions on an outer peripheral surface, the depressions being formed so as to form a line along an axial direction of the steel pipe, in which each of the depressed portions has, inside thereof, a columnar groove portion extending along the axial direction of the steel pipe and depressed deeper than a bottom surface of these depressed portions; 0.95&#x2266;H/H&#x2266;1.05 is satisfied, where His an average Vickers hardness in each of the depressed portions, and His a Vickers hardness at a portion between the depressed portions adjacent to each other in the axial direction of the steel pipe; and the outer peripheral surface is covered with a mill scale.

Depression-provided steel pipe and composite pile

This underwater structure is installed at the sea bed and supports an above-water structure that is provided above the water, being provided with a first support member made of steel that extends from the sea bed to above the water and that has a first space therein; and a filling material being filled in a portion of the first space.

Underwater structure, construction method therefor, and design method and renovation method of underwater-side structure

A steel material for an underground continuous wall equipped with a hat type steel sheet pile having a hat-shaped cross-section, and an H-beam having an H-shaped cross-section, wherein: the hat type steel sheet pile includes a web, a pair of flanges, and a pair of arm sections; the H-beam includes a pair of flange sections and a web section; an outer surface of the H-beam is secured to an outer surface of the web; the length of the H-beam is shorter than that of the hat type steel sheet pile, and an overall length of the H-beam is arranged within the length of the hat type steel sheet pile; and a rear end of the H-beam is located closer to a forward end side than a rear end of the hat type steel sheet pile.

Steel material for underground continuous wall, method for producing steel material for underground continuous wall, underground continuous wall, and method for constructing underground continuous wall

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Tokyo, Japan

Shinji Taenaka