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

The outcome was first applied to the restoration of DoshishaUniversity Shoeikan (photo 2), an Important CulturalProperty, as a new method of reinforcement (Hosono 1982,p54).The advantages of this approach was that the innersurfaces of the brick exterior walls could be preserved,the construction period required for this dry constrictionmethod was shorter, reinforcement elements werecomparatively light making large-scale foundation systemsunnecessary, and these steel frames could be removed easilyto enable future surveys and flexibility in building use. Also,there would be no problems of concrete carbonization oreffects of efflorescence.On the other hand, there are other problems that needto be taken into account. Steel reinforcement membersare visible inside the building and there is a difference inrigidity as well as movements of the brick wall and steelreinforcement. Although the fire resistance property of steelframes is lower, it can be improved by using non-scalingsteel or by coating with fireproof paint (Nishizawa 1994,p82). Also, in buildings with complex floor plans, steelreinforcement is difficult (Hosono 1982, p56) and deliveryand installment of steel frame reinforcement elements needto be carefully planned. Additionally, it has been pointedout that“when reinforcement of the brick masonry itself isignored, cracking and spalling of bricks may occur, whichwas actually observed in areas affected by the Great EastJapan Earthquake in 2011 in brick masonry structuresnot designated as cultural properties.”(Hasegawa 2012,p70) This suggests that in structures to be reinforced withsteel frame, it is necessary to combine other reinforcementmethods to establish a comprehensive protection system.Although they are not Important Cultural Properties, inthe restoration completed in 2002 of the Yokohama RedBrick Warehouse (photo 3), in order to create anti-seismiccores around staircases, steel frames were constructedinside buildings (Nishizawa 1997, p38). Also at FormerTemiya Railway Facilities Shed No. 3, an Important CulturalProperty restored in 2008, steel frame reinforcement wasinstalled on the inside (photos 4 to 6). Although this is asmall-scale structure, steel pipe columns were adopted andplacement of the reinforcement columns and beams wascarefully designed taking into account the location of wallopenings, and interior lighting was planned so that thesereinforcements would be less noticeable.Steel frame reinforcement can been seen in many culturalproperties. Although this can now be considered to bea staple method for reinforcement, looking back on thetime when it had just appeared and was treated as“newvocabulary”(Hosono 1982, p52), the author believes thatthe efforts of those involved in its conception to realizationneed to be highly evaluated today.３.３. Reinforcement with Stainless Steel PinsThis is a method for wall reinforcement involving insertionof stainless steel pins into the wall at a 45-degree angle totie together and solidify individual bricks.Its advantage is that“there is little change in exteriorappearance of the brick wall after application”while onthe other hand, it has been voiced that“a very tiny fractionof the brick section is lost, and therefore if it is necessaryto completely preserve the brick material as a culturalphoto 3 Yokohama Red Brick Warehousephoto２Doshisha University Shoeikanphoto 4 Former Temiya Railway Facilities Shed No. 324Chapter 3Restoration of Brick Masonry Cultural Property Structures