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

5-3. Bricks to be used for replacement【Case 1：Former Temiya Railway Facilities / Engine Shed】? Restoration planningReplacement or relaying of bricks was applied mainly onbricks damaged by freeze-thaw. A method was devised inorder to match the replacement brick to the extant material fn 27 .? Restoration MethodThree types of brick were employed for replacementaccording to the area to be treated.1 Old bricks removed from the structure for installingreinforcement in the roof structure and other areas: Foruse in damaged areas on the wall surface and gable wallcornice, defects around the arch springer, relayingbricks of the front arch, upper areas of the foundation, pitfn 28partition walls, and exposed wall surfaces (photo 5-10)2 Salvaged bricks from nearby brick structures: Foruse in areas where the wall meets the roof structure3 Reproduced bricks, newly made following specificationsof the original brick: For use in brick arch corbellingareas, wedge-shaped arch bricks (photo 5-11),interiors, bricks around window openings, partition walls,upper areas of the foundation, for inner and hidden areassuch as the pit, as well as for irregularly-shaped bricks? OverviewCare was taken to match the replacement bricks with theextant masonry, in such ways as to gather bricks for reusefrom those removed for installation of reinforcement on theexterior wall. To make every effort to reuse materials whichwere removed through restoration is effective from theviewpoint of preservation of information on building materials.photo 5-10 Arch over window opening replaced by old bricks（replacementsin white lines）photo 5-11 Reconstruction of arches over the train shed doors with reproducedbricks【Case 2：Former Yamagata Prefecture Assembly Hall】? Restoration planningchart 5-3In the brick walls of the prefecture assembly wall, manmadedamage owing to past building alterations and surfacedelamination from freeze-thaw were observed. Differentrepair methods were adopted for each of the conditions andareas of damage and deterioration.? Restoration MethodRestoration methods that were adopted are shown in chart5-3. In repairing holes made for plumbing installation, the hallswere filled with mortar or brick pieces and only the surfacewas touched up.Also, so as to match the extant brickwork, composition ofthe material to be used for repairs was carefully controlledaccording to the area of application, such as in artificial brick,the ratio of brick powder and resin agent, and in pointing forjoints, the ratio of mortar and colorant. For replacement bricks,the manufacturer that originally produced the structuralbricks was still in operation and bricks were specially orderedin sizes to match the originals fn 29 .? OverviewThis was a very rare case in which replacement bricks couldbe produced by the original manufacturer. Also, methods oftreatment were carefully chosen according to the conditionof brick damage and deterioration, with consideration to thebuilding’s value as a cultural property.Repair methods for damaged / deteriorated bricksmethod / material statusreplacement? severe damage due to penetratingholes made in walls for pipingpatching repair? moderate damage with holes ofdepths less than half the wall thickness? spalling on the brick surface byfreeze thaw damage? partial damge due to cracksynthetic filling? small damage where patchingrepair is not optimal? minor freeze thaw damage? minor crackspecification1 remove damaged brick andsurrounding joints2 in case of inner damage, removeand fill with mortar and brick pieces3 replace with a new brick1 scrape off 20 to 30 mm from thedamaged surface2 patch only in the damaged areaand the use epoxy resin1 coat with KANETA GEMLAC(acrylic silicone oligomer) to thearea to be repaired2 mix brick powder (powder generatedby cutting) and resin agentfilling holes1 fill the mortar and brick pieces? where hole filling repair is hiddenby surface finishesremoval method1 remove the mortar with sander? remove extraneous mortar from polisherbrick surfacewall surface cleaning? remove extraneous coal-tar frombrick surfaceapplication of water repellant? spalling on the brick by freezethaw damage? surface treated brick (sanderpolisher)1 manual work2 chemical cleaning (thinner)1 application of water repellantwith brush98Chapter 6A Collection of Case Studies of Preservation and Restoration of Brick Masonry Structures