ブックタイトル「煉瓦造建造物の保存と修復」英語版

概要

「煉瓦造建造物の保存と修復」英語版

5-4. Preservation of the present state:preservation of the deterioratedwall【Case 1：Chimney of Former YamaneSmelting Plant】Name：Chimney of Former Yamane Smelting PlantConstruction year：Meiji 21（1888）Structure：Brick masonry（reinforced concrete in the flue）Height 20.145mLocation：3-2822-1 Shindencho, Sumino, Niihama City,EhimeProprietor：Niihama CityDesignation/Registration（date）：Registered Tangible Cultural Property（2009.08.25）Restoration period：2009 ? 2010photo 5-12Preservation of current state of conservation of brick walls with salt damagephoto 5-13State of deteriorated bricks and joints repaired before seismic reinforcement? Restoration planningThis chimney was constructed close to the mountaintop and is a landmarksymbolizing the region’s past history of prosperity through mining. Throughstudies regarding preservation methods of the chimney, a consensus wasachieved among the citizens and the municipal government on the significanceof the weathered appearance, resulting in preservation of the chimney nearlyin the state before restoration (photos 5-12, 5-13, and 5-14) fn 30 .photo 5-14An overall view of brick chimney? Restoration MethodSalt damage was seen on the entire brick wall, where both brick and joint hadpowdered with many bricks becoming loose and falling, resulting in danger ofcollapse. Therefore, a reinforced concrete wall was created on the inner surfaceof the chimney wall (photo 5-15) and stainless steel pinning was applied on thebrick wall surface to solidify the entire structure. Different lengths of pinningscrews were used according to variances in the wall thickness. In the lowerlevel of height up to 7 meters, 660 screws of 750mm length were inserted; inthe middle level of height from 7 to 11 meters, 288 screws of 650mm length;and in the higher level of height from 11 to 18.775 meters, 300 screws of550mm length, totaling 1,248 screws in all (figure 5-6). Presently, in the lowerlevel which can be confirmed by visual inspection, stainless steel pins havebeen installed every four courses and their placement was controlled accordingto the condition of damage and deterioration (photo 5-16).The area at the chimney top where damage was most severe (photo 5-17)has been reconstructed, including the decorative brickwork at the top end fn 31 .99