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

restore現状変with更に伴plasterい漆喰finish塗仕上げで復旧replace extantセメントグラウトpointing with材nonshrinkagecement注入工法によるfor waterproofing止水目地新設infiltered ground water evaporates止水目地で止められた水分は、from the surface of brick and plaster発散性のある煉瓦面や漆喰面(below penetration preventive joint)から蒸発する。penetration of ground water地下水の吸い上げmortar applied on the brick wall surfaceprevents the water from evaporating.water煉瓦壁のremained表面に塗られたモルタルでunder the brick surfacefeezes水分が蒸during発せず、煉winter瓦材の表and層に水its expantion分が溜り、冬leads期間になるとto brick水分fractureが凍り、膨張して煉瓦材を破断させる。凍て割れfreeze-thaw spallingfloor▼修level理前FLphoto 5-4 freeze-thaw spalling（before preventionfor water infiltration）（photo provided by：JapaneseAssociation for Conservation of Architectural Monuments）floor level (restore▼竣工with時FL（earthen旧土間叩きのfloor復旧）water▼ＷＬlevelpenetration地下水の吸いof上げgroundwaterwater proof防mortar水モルタルcoating塗布ジャンカno-fines部concrete分が多い【施【after工後】】【施【before工前】photo 5-5 present condition after prevention for waterinfiltration（photographed in February 2017）figure 5-1 schematic diagram of water permeability prevention method（figure provided by：Japanese Association for Conservation of ArchitecturalMonuments）Areas where pointing had been removed were cleansedby spraying with high-pressure water.photo 5-6 Cleaning the area where pointing was removed（photo providedby：Japanese Association for Conservation of Architectural Monuments）4 Application of non-shrinkage cement (photo 5-7).Preventive measures for water absorption were takenbeforehand as necessary. In areas to be sealed, holes forinjection and air holes were first made, andthen styrofoam was placed in the joints forsealing the spaces to be filled with mortar.5 Repeat the first series of steps including boring of holesin walls.Repeat the process from 1 to 4 .6 Restoration of the holes made for repairsInject mortar into the holes made for inserting wire saws.? OverviewBefore restoration, groundwater had entered into thewalls of the engine shed which in winter caused freeze-thawspalling between the mortar-covered wall surface and thebrick wall, creating cracks in the mortar finish. At first, thecrack-producing mechanism was unclear, but as it becamephoto 5-7 Replacement pointing material（photo provided by：JapaneseAssociation for Conservation of Architectural Monuments）apparent that it was caused by absorption of groundwater,the route from which water entered was sealed.In conventional restoration, brick walls were treated onlywith water-repellant, even when material deteriorationwas observed. In this project, a more thorough preventivemethod against water ingress was taken. Although it hasbeen more than seven years since completion, the wallsin which freeze-thaw cracks were seen before treatmentmaintain their sound conditions (by visual inspection).However, the untreated brick floor of the pit continuesto be troubled by freeze-thaw damage fn 19 . From theseobservations, it can be judged that installation of sealantswas effective.Alterations to the structure through this treatment waslimited to one course of the brick joint and thus, its effectson the structure’s significance as a cultural property waskept to a minimum.95