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ID:8086168
大小:362.59 KB
页数:13页
时间:2018-03-05
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1、3Materials,componentsandtoolsThischaptergivesanoverviewofthetopplatemainmaterials,componentsandtoolsyouwillneedtobuildwithstrawbales.Tie-downwireThestronglyrecommendedpracticeistotiedownthewallstothefoundationstomakethemstableandtominimiseanytendencyforthemtosettleovertime.Thebestmethoddevise
2、dtodateuses2.5mmdiameterstrawbalewall(12.5gauge)hightensilewire,whichusuallyisavailablein1500-metrerolls,morethanenoughforatypicaldomesticdwelling.wiresanchoredNumerousalternativesforwalltofootings–compressioncanbefoundinthevariousmethodsliterature,rangingfromnothing(letthewallssettleforweeks
3、ormonthsbeforefootingplastering—the‘Nebraskastyle’)tothreadedrodsinsertedcentrallyforthefullheightofthewall.Tie-downwithFig.4Walltie-downgeometry.Tie-downwireshightensilewiretendstobefarareanchoredinthefootings,passoveratopplateandaretensionedtoincreasetherigidityofsuperiortopublishedalternat
4、ives.thewall.Materials,componentsandtools11TopplatesThecompressionwiresarerunoverthetopofthewallanddowntothefoundations.Sincetheyaretightenedtoconsiderabletension,somethingmustbeplacedontopofthewalltopreventthewirescuttingintothetopbales.This‘topplate’cantakevariousforms.Mostbuildershaveusedt
5、opplatesintheformofheavywoodenladdersorwideplanksofwoodplacedcentrallyontopofthewall.Evenconcretebeamshavebeenadvocated.Suchheavy-dutytopplatesareattractiveforload-bearingwalls,becausetheyprovidearigidbeamontowhichtheroofstructuremaybefixed.However,suchfacilityisnotrequiredofthetopplateinthec
6、aseofin-fillwalls.Infact,amuchlighter,cheaperandmoreeasilyinstalledtopplatecanbeusedforbothin-fillandload-bearingwalls.Thisalternativeisasteelladderthatcanbemadefrom16mmto25mmnominalbore(NB)steelpipe;25mmNBpipeisthemoreappropriatesizeforload-bearingwallsandwillundergolessdistortionforinfillwa
7、lls,whichisparticularlyimportantwhenwallsaretieddownusingthecommonfencestrainermethod,discussedlater.The‘rungs’oftheladdermaybe12mmreinforcingbarorotherrelativelylightweighttube,pipeorrod;theserungscarrynosignificantload,sinceessentiallytheys
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