Sumitomo Electric Industries, Limited

Sumitomo (sei) Steel Wire Corp.

Yoshiyuki Matsubara

Masato Yamada

Katsuhito Oshima

Masashi Oikawa

Shuichi Tanaka

Kiminori Matsushita

Toru Yamamoto

Jun Sugawara

Shingo Nakajima

Kazuyoshi Chikiri

Motonobu Nishino

Shinji Nakaue

Shinichi Yamanobe

Michio Imai

Naoki Sogabe

Kazumasa Okubo

Toshiyuki Kobayashi

A concrete structure includes a first concrete member, a second concrete member, a sheath that is disposed in a through hole extending from the first concrete member to the second concrete member, a tension part that is inserted over the entire length of the sheath and that is subjected to a tensile force, a fixing tool that fixes the tension part to the first concrete member or the second concrete member, and an anticorrosion part that covers the fixing tool. The tension part includes a stranded wire part and a first cover that covers an outer periphery of the stranded wire part. A space between the sheath and the tension part is not filled with a grout material.

Concrete structure

A coated PC steel stranded cable includes: a stranded cable in which a plurality of elemental wires each composed of steel are twisted together; an anti-corrosive coating having an outer circumferential portion that coats an outer circumference of the stranded cable; an outer coating that coats an outer circumference of the anti-corrosive coating; and an optical fiber provided at a position inwardly of an outer circumferential surface of the outer coating and corresponding to a strand groove in the stranded cable so as to follow expansion and contraction of the stranded cable.

Coated PC steel stranded cable

To provide a concrete-reinforcing shaped body containing concrete-reinforcing fibers and having a plate-like shape. The concrete-reinforcing fibers each preferably have a diameter of 0.3 mm or smaller and a length of 5 mm or larger and 25 mm or smaller.

Concrete-reinforcing shaped body, method of manufacturing the same, structure of packaging concrete-reinforcing shaped body, and method of mixing fiber-reinforced concrete

A pregrouted PC steel material () includes a 19-wire-twisted PC strand (), a pregrouted layer () disposed on an outer periphery of the PC strand (), and a sheath () configured to cover an outer periphery of the pregrouted layer (). A filling resin () is filled between steel wires (side wires) (). Since the filling resin () does not exude to the pregrouted layer () before tensioning of the PC strand (), an operation of tensioning the PC strand () is not hindered by curing of the pregrouted layer (). In contrast, since the gap between the steel wires is reduced when the PC strand () is tensioned, the filling resin () flows out (exudes) from between the steel wires to the pregrouted layer () to cure the pregrouted layer () only after the reduction.

Pregrouted PC steel material and curing method for pregrouted layer therein

Growing community of inventors

Itami, Japan

Yoshiyuki Matsubara