旧大阪中央電報局局舎の減耗調査 : その 1 : 鉄筋コンクリート, 鋼製建具

元データ 1968-02-28 社団法人日本建築学会

概要

In this paper, a research is reported on wearing of the building which was demolished after about forty years. We have tried to catch the fundamental data for building maintenance by this research. 1. Concrete; As the result of concrete tests by a non-destructive method (Schmidt-Hammer) and a destructive method (Core-boring), we have recognized that the compressive strength was higher than the anticipated one by certifications (135kg/cm^2), and the concrete job was not so poor in those days. The mean depth of neutralized plaster was 20mm and agreed with the value of "Pastyear-Neutralization formula". 2. Reinforcing bar; The steel aging was not recognized and its tensile strength didn't reach to the yield point even at a concrete crack-width 1.5mm. 3. Steel sash and shutter; By sunshines and usual winds, the aging difference between northern and southern side was great. Concerning to steel shutters, we were able to operate them very well in spite of few repairs during many years. 4. Ceramic tile; Tiles on the external wall were semi-porcelain by reason of colour, so the absorption ratio was very high. But there was no damage for frost, then it is reliable that the semi-porcelain tile can be used as well as the porcelain one in Kansai district. More than 80% of total wall tiles didn't adhere with the concrete, caused by corrosion of steel sashes. 5. Linoleum; As the result of endurance test and abrasion test, etc., its aging was generally little. 6. Non slip of a stair case; The wearing thickness of non slip made of bronze, were measured and then we recognized the point of 45cm apart from the handrail was most worn away. 7. Others; Brick and other materials were examined and researched.

著者

飯塚 裕 日本電信電話公社建築局
小林 清周 大阪工業大学
岩井 元義 大阪工業大学
真下 定人 日本電信電話公社
上蓑 義一 共立建設KK
真下 定人 日本電信電話公社建築局

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