资源描述：
《IS 401 2001 PRESERVATION OF TIMBER》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、,Wam=m+@H%@Jmtfa+f%tIndianStandardPRESERVATIONOFTIMBER—CODEOFPRACTICE(FourthRevision)IIICS79.020III.,.0BIS2001BUREAUOFINDIANSTANDARDSMANAKBHAVAN,9BAHADURSHAHZAFARMARGNEWDELHI110002December2001PriceGroup9TimberandTimberStoresSectionalCommittee,CED9FOREWORDThisIndianStandard(FourthRevision)was
2、adoptedbytheBureauofIndianStandards,afterthedraftfinalizedbytheTimberandTimberStoresSectionalCommitteehadbeenapprovedbytheCivilEngineeringDivisionCouncil.Thisstandardwasfirstpublishedasatentativestandardin1954andwassubsequentlyrevisedandissuedasafirmstandardin1961.Withtheuseofthiscodeoverape
3、riodof6years,theSectionalCommitteefeltthatitmightberevisedsoastomakeitup-to-dateandalsotoincludesomemoreinformationonprophylactictreatment,diffusionprocess,etc.Secondrevisionofthestandardwas,therefore,broughtoutin1967andthethirdrevisionin1982.Inthethirdrevision,besidesmodifyingdurabilityandt
4、reatabilityfiguresforsomeofthespecies,modificationsweremadeinTable2givingrecommendedpracticesforpreservationoftimberfordifferentserviceconditions.Inthisrevision,treatmentprocessfortreatingrubberwood,khasipine,poplar,etcingreenconditionhasbeenincludedbesidesmodifyingdurabilityandtreatabilityf
5、iguresforsomeofthespeciesandinclusionofsomenewspeciesinTable3andfurthermodificationshavebeenmadeinTable2.Sincethesubjectofpreservationandtreatmentofrailwaysleepershasbeencoveredunderaseparatestandard,referencetorailwaysleepershasbeenomittedfromthisstandard.However,itdealswithtrackwoodensleep
6、ersforotheruses.Withtherapidindustrialandagriculturaldevelopmentofthecountry,thedemandfortimberforvariouspurposeshasincreasedconsiderablyandinviewofthelimitedavailabilityofnaturallydurablespecies,suchasteak(Tectonagrandis)andsal(S/roreurobusta),itisimperativethatsuppliesofdurabletimberareaug
7、mentedbyselectedtimbersoflesserdurabilitywhich,whensuitablytreated,wouldgiveadequatelifeunderserviceconditions.Preservativetreatmentoftimber,therefore,formsaveryimportantpartofthenationalefforttoconservethematerialresourcesofthecountry,andtoachieve
