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

appear in wider areas, removal with such methods as highpressurewater cleaning should be adopted fn 11。However, because this is a method that does not involvealteration of the environment, there are possibilities oflichen and algae reappearing. Therefore, the time periodin which the condition of the wall returns to that beforecleansing should be observed, so that walls can be cleanedat appropriate intervals. Also, as high water pressure mayharm the brick and joint, water pressure should carefully becontrolled. The same can be said about moss and herbaceousplants. Removal and weeding with chemical agents mayinduce the appearance of organisms that live on theseagents, so they should be used with precaution.Uprooting of these herbaceous plants can cause severedamage to brick and joint that if plants which have grownto a certain extent need to be removed, they should first bewithered and wait for the roots to thin so that they can bepulled out with minimum harm to the masonry. Also, if theuprooted masonry is left as is, it will induce water ingressand lead to severe deterioration from salt damage or freezethawdamage, so the uprooted masonry will need to betreated to fill in these crevices.photo 4-6Growth of herbaceous plants? Removal of ivyphoto 4-4 Growth of lichen and algae? Removal of mossMosses grow their rhizoids (roots) into the brick and jointand may damage the wall surface (photo 4-5). Therefore, ifmoss growth is discovered, it will need to be removed. Mossis often removed by hand; if moss growth appears on areaswhere the brick and joint are weak (where powdering, popoff,or cracks can be observed), harsh removal should beavoided as it may greatly harm the brick fn 12 .Ivy attaches itself with extended aerial roots and growsby spreading over walls (photo 4-7) fn 13 . In small areas,they can be removed easily, but ivy growing over a largearea requires extensive work for removal. Therefore, theyshould be removed at an early stage as possible. Growingaerial roots that attach onto tiny cracks and rough surfacescan expand damaged areas if they enter places with cracks.Removal of grown ivy should be done first by witheringthe plant completely and removing the aerial roots fromthe walls. If the roots have entered the cracks, work can becontinued only after checking how deep into the wall theroots have reached.If the entire wall is covered with ivy, regular trimmingfor growth control is necessary fn 14. Also, ivy under hightemperature and high humidity may become infected withfn 15the brown patch disease and therefore it is advised toconsult a specialist when this occurs.photo 4-5Growth of moss? Removal of herbaceous plantsGrowth of herbaceous plants may cause cracks in brickand joint and thus should be removed at an early stage aspossible, when they are small leaf buds (photo 4-6). Longintervals in monitoring of the walls may lead to the rootsof herbaceous plants growing into the brick and joint.photo 4-7Growth of ivy93