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

there is much research and continued use in constructionin areas other than cultural properties. On the other hand,there is practically no new construction with brick employedas the main structural material, which limits to the field ofcultural properties research and technological developmentregarding brick masonry. In other words, for many of thespecialists involved in architectural restoration, brick issomething they are not familiar with compared to otherbuilding materials. Also, it needs to be noted that there isnot enough experience on which judgments can be madeconcerning the appropriateness of traditional principles forrestoration or applicable restoration methods.Therefore, in order to establish principles and methods forpreservation and restoration of brick masonry structures,the aim of this research project has been set to clarify thepresent status and to collect and analyze information whichcould be employed for problem-solving. This project will beregarded as the first of a five-year research titled Researchon Preservation and Restoration of Modern Cultural HeritageProperties commenced in 2016. Other materials such as steelor reinforced concrete are being considered as subjects of ourstudies in the coming years.2. Present Status and IssuesAs the first in this series, at the Modern Cultural HeritageSection, specialists from outside the institute were invited toparticipate in the Seminar on Preservation and Adaptive Useof Brick Masonry Structures to discuss the present status ofthe field and future goals. Through this process, the aimedtask was largely grouped into four based on results of pastresearch and restoration projects, while at the same timesetting themes for each category (chart 4). So that the fruitsof this survey would not only contribute to advances in brickstudies but rather bring about new insights to restorationpractices, opinions of specialists familiar with restorationpractice were referred to (chart 5). Additionally, even whenfocusing on abstract themes such as restoration principles,care was taken that these studies would be handled astechnical matters.3. An abstract of this ReportUnder these conditions, the Modern Cultural HeritageSection first undertook case studies of preservation andrestoration projects of brick structures from Japan andabroad (These places are listed in Chapter 6), then referredto the issues in chart 4 for managing information and furtherstructurenumberdetail（age of building）50 years 75 years 100 yearsbrick masonry71962（reinforced）concrete525389stone masonry30228iron structure19118others（mixed structures, etc.）581453total230664160chart 3Number of non-wood-frame modern heritage properties nationally designated as ImportantCultural Properties according to type of structure and age of building（August 2015）TopicRe-laying of bricks and brickreplacementJoint pointing specificationsMethods for seismicprotectionWater-proofing and antihumidityproceduresIssuesFrom the point of view of authenticity, re-laying of bricks and replacement of brick elements are bestto be avoided, although how they are dealt with differs by restoration site.In some areas of Western countries, traditional pointing methods continue to be used. However, inJapan, cement mortar is widely used and awareness for relying on traditional methods is generallylow. Further studies are awaited for issues of authenticity of pointing with regard to seismic safety.In recent years, although diverse technical developments for seismic protection have appeared, thereare pros and cons for each of them. Methods with little effects on the structure itself may involveproblems regarding reversibility. Improved design for reinforcement members needs to be worked on.Although it is necessary to protect brickwork from water and moisture in order to preventdeterioration due to salt weathering and/or freeze-thaw, there are few effective protective methods.chart 4Present issues in preservation and restoration of brick structures8Chapter 1The Aim and Role of this Research