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SECTION2B SOCIALINFRASTRUCTURE(BUILDINGANDUTILITYWORKS)PART1 BUILDINGWORKSSECTION1.MATERIALS Materialusedshallbethebestofitskindandshallconformtothefollowingstandards.懶1街.統(tǒng)1型 朝W俱a魄t張e蜻r椒 后A填l茄l將皮w死a喂t盆e秀r桑輔u君s腥e稠d罩降f貧o遭r諸跑m掠i賺x戚i態(tài)n僻g飯削c裂o已n碑c赤r欲e眨t絲e幻,蝕全m更o淡r眨t豆a狡r祥果o礙r觸滋g必r遠(yuǎn)o久u幕t搭由s困h濱a芳l知l信驚c蓄o犧n午f習(xí)o賺r比m盞軍t脖o蹦仗S玻L園S授梁N乏o哥.網(wǎng)打5粥2移2奪電a蠻n中d暫吵b窮e請(qǐng)強(qiáng)o訂b喚t唉a雖i組n墳e閑d鳥街f詳r銅o鉗m顛字a內(nèi)父s遞o尸u佩r截c滲e悶劈a寧p桿p牢r道o拐v幼e渠d荒應(yīng)b跌y襲問t揚(yáng)h響e韻聾E鞏n鎮(zhèn)g柜i珍n水e槽e撒r姑.境吃年T派h輔e埋磚w襖a勵(lì)t猜e嘆r憑再s廁h吳a貫l秀l棟請(qǐng)b院e閘半f羊r階e米s笛h撤,側(cè)良c帝l聾e論a賊n隸多a絞n院d于碧f熊r虎e包e弟紗f描r目o寶m丙莖a胸c蝴i鹿d劣,眉騙a失l唯k啦a染l犧i將,筒拳o閣i手l趁,胡祖o寶r挽g未a抄n諷i鋤c寧吹i軍m廉p塞u您r幸i砍t宇i漏e從s族,墨以l潛i唇m劃e傾壩i閃n懼相s叔o胃l歡u桃t蛙i剪o濟(jì)n聞捕o下r顯閃o秤t傍h繼e騙r抱驚m鏟a返t免t壤e于r旱虜w告h溝i櫻c冬h戀均i袖s靜敏d甘e輸l渠e嚴(yán)t削e長r貓i要o旗u今s雕紋t青o禿憲c還o別n經(jīng)c提r悅e多t誕e妻播o篩r龜葵s返t壁e很e風(fēng)l茶.憐僚滅I坑n丘挽g州e罵n穩(wěn)e擠r宗a轟l興,行送p世o扮t號(hào)a軌b鄰l幼e抵羞w光a儀t湖e鏈r漲姿s浪h嫌a齒l飽l舟蝦b竄e攔頸u拖s狐e晨d舅.朵 暮A潛s霞?jí)ma帖甚g市u首i燥d壺e址,羊丘t票h差e即鋒f悔o泛l選l缸o(hù)遇w燙i心n分g判形c猴o童n飄c隨e總n壇t屑r微a膊t騾i匹o趣n川s昂醒m隸a歐y插途b誕e植跨t下a躬k蠻e樂n跡謝t黑o煌疑r危e純p柏r欄e皇s治e蜘n擦t鵝胞t咽h刻e陸組m貼a受x勺i茄m暈u怒m螺拋p套e襪r弟m其i販s掩s急i王b產(chǎn)l和e其男l(wèi)威i駛m狗i物t忍s專滾o隆f強(qiáng)么d揮e價(jià)l茄e穗t胞e氧r惱i云o各u芬s亦餓m粗a騙t童e銳r珍i然a淋l浪s姿貌i給n座話w蹲a翻t既e易r期.啞 鞏(列a翅)偷 關(guān)S拔u錘s職p本e謹(jǐn)n顆d隆e盒d尾箱m次a環(huán)t太t檔e講r法羞抖-沃偏碑2咳,艙0基0甜0恭匠m都g風(fēng)/色l懇i世t盞r勁e缸 秀(柴b完)篩 屆D胸i撲s裹s音o兄l救v虧e排d后淋m三a旁t陪t批e傲r拌照(蛇M(jìn)愈a帳x冷.逗鴿c絞o刺n愿c軋e脫n更t斤r販a躲t俘i唉o震n圾)愈 隱1椒.刪 漲S嚼o洽d董i珍u校m歇蔽&勒知P棕o溉t倘a奶s黨s持i塘u囑m涌腦B懲i渡c欣a領(lǐng)r除b遣o健n躲a攤t膀e粘雞1因,困0姐0襲0殃塞m猜g乓/場l夠i擦t粥r車e幟 世2滿.絮 祝S齊o舍d許i握u撓m水之C嫩h連l例o帝r紙i脂d責(zé)e市太2乏0插,儉0科0纏0嗎背m阿g熄/往l蹄i卷t踩r種e粉S岸o慰d四i奶u華m漆漫S朋u之l財(cái)p哀h醫(yī)a盼t畜e事糧1盆0猛,袖0另0徑0萬覺m漠g嘩/濾l步i成t陣r咱e陣 允4亂.仿 翼C稼a分艘+罰痕M旅g趕稅B稈i商c忌a如r智b鴉o永n除a賓t佩e(cuò)粱慌a峽s授斤H斯C蔬O戀熄4爽0顯0仁波m脅g慶/謹(jǐn)l襖i掀t輔r晃e怒 脈5耐.武 兼C娛a秋l銜c耀i鵝u耐m濫災(zāi)C樸h賓l剝o陷r叨i膨d印e帥損2嗎0演,腸0柿0在0蚊姐m式g仰/繁l窯i舊t姨r僅e啞 踢6稅.柏 訓(xùn)I眼r老o腎n閣搏S棍a孤l金t類s脹兆-燈糧4矮0哄,傲0神0厘0米型m運(yùn)g蜜/傾l邁i壇t計(jì)r昏e且 慌7田.傻 狡S濟(jì)o歷d茄i潛u勉m礙黨I固o罷d宜a能t康e膊,喊蘋P護(hù)h襯o搖s盡p南h冰a左t食e例,辨立A兩r段s廚o據(jù)n羽a峰t過e朽漫&僚蝦C缸o(hù)緊r慨a(chǎn)閣t警e酷玻5議0蘿0繭夠m訂g趟/越l仁i掘t飛r疲e飛 奴8蠶.扇 洲H蝦C升L夕原+季慈H姐2由S棕O膊4店陰-此致1禿0可,清0旅0甘0牌疏m膀g盜/崖l到i適t絨r伐e托 窄9餡.壤 鳳N朱a香O紐H京織-占塑5越,護(hù)0爛0宮0蛋骨m慢g云/蓮l附i煮t幻r述e桃 豪(嘴c評(píng))屬 剝p寄H偽托v械a柔l鐵u辭e自仍o菌f犬魚w按a岡t助e抱r番問s永h苗a賣l摩l墨石g虜e師n今e箱r邊a猾l吃l垂y毀拉b即e贏佳n倒o游t腔設(shè)l毫e盒s潔s侵剛t駁h繭a梯n聾隨6殿 挑S源e憑a做客w聯(lián)a貴t至e橋r糊浸s漿h帆a度l暴l輪賞n鉤o襯t軋煌b福e廉夫p揉e燦r動(dòng)m黨i礎(chǔ)t療t胸e胞d著遙f戒o答r骨劇m扯i量x櫻i悟n桐g型帥o蔬r植柄c喪u段r跟i身n液g兇晶o浩f梨獻(xiàn)c昏o隨n捏c始r跑e合t淺e廊.穿 滅W鈔a乳t垂e閃r蛙艱f況o禍u煎n鑼d悔紙s鋪a港t鋒i佛s穩(wěn)f具a協(xié)c怕t訂o末r豈y敬莖f饒o策r議恢m謙i購x耀i夾n嘆g懷紀(jì)i朋s隆旋a確l液s扁o絲以s宜u畏i托t員a隊(duì)b晃l觀e普刷f域o價(jià)r散栗c禍u蒙r恒i搶n云g尿尸c譜o東n廚c管r電e碗t酬e樸.米姨H甩o折w竄e蓋v派e那r勾,比有w愉a幕t雞e左r穩(wěn)義u佳s右e帳d鼠蜻f礦o窗r繩墨c蛛u槽r誼i各n辛g諷項(xiàng)s書h死a段l鉗l色吃n窄o千t梁咸p絡(luò)r感o書d嘴u獸c不e查市a羅n以y阻軍o頂b丹j雀e飾c辮t券i憲o譜n怨a烈b蠢l溪e溫欠s冬t乳a孕i廊n有怠o帥r園變u客n竹s撤i羽g種h租t探l暗y許畫d煎e(cuò)湯p較o臂s宋i錘t量珠o饞n懸瞎t瀉h抓e嗽騾c疤o節(jié)n確c勵(lì)r吼e羞t生e脈瓶s萍u掀r齡f陣a訓(xùn)c超e孝.退泡式T敢h警e俱榮p譽(yù)r薄e貧s觀e后n謀c升e醫(yī)愉o儲(chǔ)f放晌t所a殿n屈n鴨i柿c消決a址c拾i迅d鼓衣o超r覆樹i顫r益o認(rèn)n粒礦c考o(jì)帶m夢p窄o攝u漢n粘d萌s蓬死a蜂r悉e迫跳o頸b繼j客e計(jì)c色t貸i板o粒n塞a緊b槳l辰e忍.恐 茅T窗h影e佩輝C育o績n望t捷r疤a閘c葵t籠o賭r壤寫s株h或a妨l拍l膊岸m孔a蕉k致e撓豆a騎r附r戰(zhàn)a攪n引g蛇e慰m擠e垃n萬t蜻s傍炭f彈o釣r普噴a兵n陸d奔章p蜘r休o碧v稱i竹d湯e誤朝a舟l稼l譯乘t愁h亮e寧獄w現(xiàn)a悟t央e以r舉愿n皂e秋c霉e咸s胖s趴a塵r卻y嘉廉f勾o寺r庫泳c辯o仗n籠c賞r車e霞t園e肝,定援m撒o役r褲t薄a井r兆,陽底c攤u觀r匪i遙n匙g齡糖o恐r越波a杠n梨y受尊o椅t撞h哪e槍r蠻辛p棟u劑r老p港o乳s涌e英缸o(hù)火n碧脊t塵h鐵e春槽w雙o昂r砍k妹.驅(qū)1啄.慎2信 華C摸e撓m寒e冊n蝦t杰G蟻e劉n春e珍r皆a章l辟 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StorageofcementatthesiteofworkshallbeattheContractor'sexpenseandrisk.1.2.3 TestingofCement TheEngineermayextractsamplesofconsignmentsofcementasandwhenhedesiresforthepurposeoftesting.TestingshallconformtoCS107forPortlandcementandtotherelevantSriLanka/Britishstandardsforothercements.Ifthesamplefailsthetest,theparticularconsignmentshallberejectedandshallberemovedfromthesitewithin24hoursofnoticeinwritingtotheContractortodoso.Anyconsignmentofcementstoredatsiteformorethan3monthsshallbere-testedifsorequiredbytheEngineer. TheContractorshallarrangeforthecementtobedeliveredatthesiteinsufficienttimeforstandardteststobemadebeforethecementisrequiredforuseorprovidecertificatesoftestsfromthesupplierthatwillbeacceptabletotheEngineer.1.3 Lime Limeshallbeobtainedfromanapprovedsource.Itshallbeoneofthefollowingtypes,asperSLS552dependingontherawmaterialsfromwhichitwasmanufactured. Type1DolomiticLime Type2CoralLime*andSeaShells Type3BurntMioceneLimestone Limewhichhasperishedorwhichhasbeendamagedbydamp,rainorintermixtureofdirtorwhichhasbecomepartiallyairslakedshallonnoaccountbeusedontheworksandshallberemovedfromthesitewithin24hoursofnoticetoremove.Limewhichgivesaresidueofmorethan10percentbyweightwhentestedwithhydrochlorideacidshallberejected. Thelimestoredattheworksiteshallbeprotectedfromweatheractionbybeingkeptinaweatherproofshedwithimperviousfloorandsides.1.3.1 QuickLime Thisshallbefreshlyburntfromgoodhardcore*seashellsorlimestonebrokentoauniformsizenotexceeding40mmandcarefullyfreedfromearthandotherimpurities. Thelimeshallbedeliveredatthesiteofthemortarmillquitefreshi.e.within15daysofthedateonwhichitwasdrawnfreshfromthekiln.Incaseswherecomplianceherewithisnotpossibleduetoseasonalclosureofkilns,writtenpermissionoftheEngineerisnecessarybeforestoredslakedlimecanbeused.Note: *Governmentiscontemplatingthebanningofcorallime1.3.2 Hydrated/SlakedLime Allimpurities,ashesorpiecesimproperlyorcarelesslyburntshallbescreenedorpickedoutbeforeslaking.Quicklimeshallbeslakedwithsufficientwater,slakingshallbedoneneitherearlierthanthreeweeksnorlaterthanoneweekbeforebeingputintothemill. ThelimeafterslakingshallbescreenedthroughasieveofsuchsizeastheEngineermaydirectandallmaterialthatdoesnotpassthroughthesieveshallberejected.Forplastering,secondandthirdcoatsorforanyfineworkunlessotherwisespecified,thelimeshallpassthrougha1.10mmBStestsieve,forallotherworkunlessotherwisespecifiedthelimeshallpassa2.36mmBStestsievewirescreen.1.3.3 LimePutty Limeputtyshallbeobtainedbytreatingeitherquicklimeorhydratedlimewithsufficientwatersoastoproduceaplastic,soundproduct. Itshallbesievedtobeentirelyfreefromcoarseparticlesandshallbethoroughlymaturedfornotlessthan16hoursbeforeuse.1.4 FineAggregateforConcrete ThisshallconformtoBS882.SeeClause4.1.5 CoarseAggregate CoarseaggregateforgranolithicfloorfinishesshallbeasspecifiedinClause4.1.6 BuildingSandsfromNaturalSources Thesandmaybenaturallyoccurringlikeriversand,pitsandorcrushedstonesand.ItshallgenerallyconformtoBS1198,BS1199andBS1200.Itshallbehard,durable,cleanandfreefromadherentcoatingssuchasclay.Itshallnotcontainharmfulmaterialslikepyrites,salts,coalorotherorganicimpuritiesmica,shaleorsimilarlaminatedmaterialsorflakyorelongatedparticlesinsuchaformorinsufficientquantitytoaffectadverselythehardening,strengthordurabilityofthemortar.Inadditiontotheabove,thesandwhenusedforreinforcedbrickworkshallnotcontainanymaterialwhichmayattackthereinforcement. Thequantityofclay,siltanddustshallnotexceedthefollowingunlessthereissatisfactoryevidencetothecontrary.Innaturalsand - 3%bymasswhendeterminedbythedecantationmethodgiveninBS812Incrushedstonesand - 15%bymasswhendeterminedbythesedimentationmethodgiveninBS8121.6.1 Grading Sandforbrickwork/stonework/blockworkandexternalplasteringshallpasscompletelythroughasieveof2.36mmsandforsecondandthirdcoatsofplastering,pointingandfineworkshallcompletelypassthrougha1.18mmtestsieve.1.7 MethodsofStacking Materialsnormallymeasuredinstacksareroughstoneofallkindsbrokenstoneandbrokenbrick,gravel,sandandlime.However,forpurposesofmixingofmortar,concrete,etc.materialslikesand,brokenstone,etc.shallbemeasuredinproperlyconstructedmeasuringboxes(orbyweightasinstructedbytheEngineer)tosuitthespecifiedproportionsofthosematerials. Pilesshallbeformedofregularshapeanduniformcrosssection. Materialsshallnotbestackedonunevengroundorinanymannerwhichdoesnotpermitcorrectandreadymeasurementfromexternalinspectionofthepiles. Roughstonewhichistobemeasuredinthestackshallbepackedsocloselyastogivetheminimumquantityofvoidspossiblewithoutactualdressingofthestonestofittheinterstices.1.8 OtherMaterials MaterialsnotdealtwithabovewillbespecifiedintherelevantpartsoftheseSpecifications.SECTION2.SITEPREPARATION,EXCAVATIONANDEARTHWORK2.1 SiteWorkGeneral Theareadescribedorshownontherelevantsiteplanorbillofquantitiesshallbeclearedofallobstructions,rootsandgrowth,vegetationofeverydescription,treesandsaplings.Unlessotherwisespecified,150mmtopsoilshallberemovedfromthatpartofthesitetobeoccupiesbytheproposedbuildingsandforadistanceof3metresarounditandthearealeveled.ThetopsoilshallbepreservedinstockpilesifsodirectedbytheEngineer.2.1.1 ExistingService Particularsofover/undergroundservicesshallbeobtainedfromtheEmployerbeforecommencinganyworkwhichmayaffectsuchservices. Theseservicesshallbemaintained/diverted/plugged/dismantledasspecifiedordirected.Incasethedrainendsarerequiredtobesealedoff,contaminatedearthshallberemovedanddisinfectedasspecified.2.1.2 DemolitionofExistingStructures Wherebuildingsaretobedemolished,thisshallbedowntogroundlevelorthebottomofposts,stanchions,etc.asspecified.Specialcareshallbetakentocausetheminimumdamagetothematerialsintheprocessofdismantling.ThevalueofthematerialswhichintheopinionoftheEngineerhavebeenbrokenordamagedthroughcarelessnessonthepartoftheContractorwillberecoveredfromtheContractor.AllserviceablematerialsshallberemovedandstackedordisposedofasspecifiedandalldebrisshallbecartedawaybytheContractor. ReferalsoClause16-DismantlingandDemolition.2.1.3 FellingandRemovalofTrees ThetreesshallbecutonlyafterwrittenpermissionoftheEngineerisobtained. Therootsoftreesshallberemovedcompletelyandtheborrowsfilledupwithsuitableearthinlayersof150mmleveledandrammedsothatthesurfaceatthesepointsconformstothesurroundingarea. Wood,branchesoftreesandotherusefulmaterialsshallbehandedovertotheEmployer.ThefelledtreesshallbecuttosuchlengthsasdirectedbytheEngineer,andtrunksandbranchesshallbeclearedoflimbsandtopsandstackedneatlywellawayfromthesiteofwork.OtherserviceablematerialsshallbestackedasdirectedandhandedovertotheEmployer.2.1.4 DisposalofWastematerials Attheconclusionofthesitework,theContractorshalltidyupandleavethesiteoftheworkinacleanandsanitarycondition.Allserviceablematerialshallberemovedfromtheareaanddisposedofasdirected.Careshallbetakentoseethattheunsuitablewastematerialsaredisposedofinsuchamannerthatthereislikelihoodofthesegettingmixedupwithmaterialsmeantforconstruction.2.1.5 Waterways Allfielddrainsandotherwaterwaysencounteredduringtheexcavationsshallbetemporarilydivertedandreinstatedorotherwisetakencareof,asdirectedbytheEngineer. Fillingofthelocationsfromwhichwatercourseshavebeendivertedshallbecommencedafterclearingawayallvegetablegrowthsandsoftdeposits.2.2 ExcavationsNote: TheContractorshallvisitthesite,inspectthetrialholesorboreswhereavailableanddecideforhimselfthenatureoftheground,sub-soiltobeexcavatedandthegroundwaterlevels.ThefurnishingofparticularsoftrialholesorboresfortheinformationoftheContractordoesnotabsolvetheContractorfromhisresponsibilitiesnordoesitguaranteethatsimilarconditionsapplyonotherpartsofthesite.2.2.1 Establishmentoflevels.1 Benchmarks Amasonrypillarofasuitabledesignshallbeerectedataprominentplaceinthesitetoserveasabenchmarkfortheexecutionofthework.Thebenchmarkshallbesolocatedthatitremainsundisturbedtillalltheworksarecompleted.ThisshallbeconnectedtoastandardbenchmarkifsodirectedbytheEngineer..2 Levels Beforeanyexcavationiscommenced,thelevelsofthesurfaceafterremovaloftopsoilshallbeagreedbytheEngineerandtheContractor.SuchagreementshallberecordedonadrawingshowinglevelsatpredeterminedintervalsandshallbesignedbytheContractorandtheEngineer.TheContractorshallprovidealllabourandinstrumentstoobtainandrecordtheselevels.2.2.2 ClassificationofSoils Excavationofvarioustypesofmaterialshallbeclassifiedunderthefollowingcategories(referStandardMethodsofMeasurementSLS573).Nodistinctionshallbemadewhetherthematerialisdryorwet.ThedecisionoftheEngineerwithregardtotheclassificationshallbefinal. (a) Soft/LooseSoil Generallyanysoilwhichyieldstotheordinaryapplicationofpickandshowel,rakeorotherordinarydiggingimplements,forexamplevegetableororganicsoil,turf,gravel,sand,silt,loam,clay,peat,etc. (b) Hard/DenseSoil Generallyanysoilwhichrequiresthecloseapplicationofpicksjumpersorscarifierstoloosensame,forexamplestiffclay,gravelandcobblestone.Note:Cobblestoneistherockfragmentusuallyroundedorsemiroundedhavingmaximumdiameterinanydirectionbetween80mmand300mm. (c) Mud Amixtureofsoilandwaterinafluidorweakstate. (d) Softdisintegratedrock(notrequiringblasting) Thisshallincluderockorboulderswhichcanbeexcavatedbybarring,wedgingandsplittingmanuallyorusingpneumatictools.Itshallalsoincludeembeddedbouldersmeasuringnotmorethanonemetreinanyonedirection.Note: ThemerefactthattheContractorresortstoblastingtoloosenthematerialshallnotmeanthatitwillbeclassifiedashardrock. (e) HardRock(requiringblasting) Thisshallincludeallrockoccurringinlargemasseswhichcannotberemovedexceptbyblasting.HardvarietiesofrocksuchasgranitewithorwithoutveinsandsecondarymineralswhichintheopinionoftheEngineerrequiredblastingshallbeconsideredashardrock.Bouldersofhardrocklargerthanonemetreinanyonedirectionlyingintheoverburdenandrequiringtobeblastedforeasyandefficientremovalshallalsobeclassifiedashardrock.ReferClause. (f) HardRock(blastingprohibited) Forhardrockrequiringblastingasdescribedin(c),butwhereblastingisprohibited,theexcavationhastobecarriedoutbychiselling,wedgingoranyotheragreedmethod.ReferClause. (g) CommonExcavation Thisshallrefertoexcavationinallsoilsexceptrockrequiringblastingwiththeuseofexcavatingandearthmovingmachinery.2.2.3 Blasting Shouldrockbemetwith,inthecourseofexcavation,itmustberemovedwithwedgesandlevers. BlastingshallnotbeallowedwithoutthewrittenpermissionoftheEngineer,whomustbefullyinformedbytheContractorastothestepstakenbyhimtosafeguardthesurroundingproperty,theContractorshalltakeallresponsibilityforanydamageorannoyancecausedbywayofblasting.BlastingoperationsshallbecarriedoutasperthespecificationssetoutunderrockblastinginSectionXIVofBSCP2003. Insoftrock,iftheContractorwishestoresorttoblasting,hecandosoonlywiththepermissionoftheEngineer,butatnoextracost.2.2.4 AntiquitiesandUsefulMaterials Anyfindssuchasrelicsofantiquity,coins,fossilsorotherarticlesofvaluewhichmaybediscoveredduringtheexcavationworkshallbethepropertyoftheEmployerandshallbedeliveredtotheEmployer. AllusefulmaterialsobtainedfromtheexcavationshallbethepropertyoftheEmployerandshallbestackedseparatelyinregularstacksasdirectedbytheEngineer.2.2.5 Protection Trenchesandfoundationpitsshallbeprovidedwithpropercautionsignalsandmarkedwithredlightsatnight,ifnecessary,toavoidaccidents. TheContractorshalltakeadequateprotectivemeasurestoseethattheexcavationoperationsdonotaffectordamageadjoiningstructures,services,etc.2.2.6 ReinstatementofDamagesduringExcavations Allmaterials,structures,foundations,surfaces,etc.affectedordamagedduringexcavationshallbemadegoodbytheContractoratnoextracosttotheEmployer.2.2.7 Anti-termiteTreatment Thetreatmentmaybepre-constructionalorpostconstructional.Wherespecified,theworkshallbecarriedoutaccordingtostandardtechniquesandpracticesusingchemicalsofapprovedmakeandconcentrationsandasdirectedbytheEngineer.2.2.8 StabilityofExcavation ThemethodsofexcavationshallineverycasebesubjecttotheapprovaloftheEngineerandtheContractorshallensurethestabilityandsafetyoftheexcavations,adjacentstructures,servicesandtheworks. ThesidesoftheexcavationifrequiredshallbetimberedandshoredbyapropermethodpreviouslyapprovedbytheEngineer. TheContractorshallhavefullresponsibilityforthestabilityoftheexcavationsandsafetyofworkmen.Ifanyslipoccurs,theContractorshallremovealltheslippedmaterialfromtheexcavatedpitwithoutpayment.Ifanydamagetoabuiltupstructureoccursbecauseoftheslip,theContractorshallmakegoodwithoutanypayment.2.2.9 ExcavationsforFoundations Excavationforfoundationsshallbetakentothenaturalfirmgroundandtothedepthsindicatedinthedrawings.SpecificinstructionsshallbeobtainedfromtheEngineer,if:(1) Thenaturalbearingstratumoccursatadepthless/morethanthatindicated(2) Thenatureofthebearingstratumvastlydiffersinitsbearingcharacteristics Inthecaseofslopingsite,allworkincludingfoundationexcavation,constructionandbackfillingshallbecompletedatthelowerlocationsbeforetheexcavationatthehigherlocationiscommenced. Thebedoftheexcavationshallgenerallybemadehorizontalandsteppedinthecaseofslopinggroundorwhenthebearingstratumrequiressuchstepping. ExcavationforfoundationinsteeplyslopingsitesorsitesonrockshallconformtodrawingsspeciallypreparedforthepurposeorasotherwiseapprovedbytheEngineer. Excavationsshallbemadetothecorrectprofilesandlevelsshownonthedrawings,trimmedtoexactshapeandalldisturbedmaterialandotherdebrisremoved.Excavatedmaterialshallnotbeplacedcloserthanonemetrefromtheouteredgeoftheexcavation. Thebedoftheexcavationshallbeconsolidatedbywateringandramming.Soft/defectivespotsshallbedugoutandfilledwiththeleanconcreteorothermaterialasdirectedbytheEngineer.IncaseanyexcavationhasbeenmadebelowthelevelshownorrequiredtheContractorshallathisownexpense,fill-uptheexcavationtoproperlevelwithleanconcreteorothermaterialasdirectedbytheEngineer. ExcavationsaretobeinspectedbytheEngineerandtheworkapprovedbeforeanyfurtherworkorconcreteorbackfillislaidonthem.Concreteorbackfillshallbelaidassoonaspossibleafterinspectiontopreventdeteriorationduetowaterorweather.TheContractorshalltakesufficientprecautionsagainstdeteriorationofexcavatedsurfaces.Ifsurfacesbecomeunsuitableduetowaterorothercauses,deterioratedsurfacesshallberemovedandreplacedwithconcreteasdirectedbytheEngineer.TheaboveshallbeattheContractor'sexpenseifitiscausedbynegligenceorforwantofprecautionsonthepartoftheContractor.2.2.10 DisposalofSurplusMaterials AllsurplusmaterialshallbecarriedawayfromthesiteanddumpedatdumpingsitesselectedbytheEngineeruptotheleadspecifiedinthebillofquantities.TheEngineermayinstructtheContractortodumptheexcavatedmaterialsinregularheaps,bunds,blankets,rip-rapswithregularslopesasdirectedandlevelledsoastoprovidenaturaldrainage.Asarule,allsoftermaterialshallbelaidalongthecentreofheaps,theharderandmoreweatherresistantmaterialsformingthecasingonthesidesandtop.2.2.11 De-watering TheContractorshallprovide,maintainandoperatesufficientpumpingequipmentoftherequiredcapacitytokeeptheareaofconstructionfreeofwaterfromrain,drains,floodssprings,etc.duringtheconstructionperiod. TheContractorshallobtainthewrittenpermissionoftheEngineerforthemethodhewouldusetokeeptheexcavationsfreefromwater,theprocedureadoptedshallnotresultinthewithdrawalofwater/orsoilfromunderneaththefoundationsofadjacentsites.2.2.12 PlankingandStrutting Excavationwithverticalsidesshallbekeptsupportedbyplankingandstruttingwhichshallbe'close'or'open'dependingonthenatureofthesoilandthedepthofthetrench.Thesupportrequiredshallgenerallyconformtosection10ofBSCP2003. SupportfortrenchexcavationalongapublicroadshallbeofadequatedesignandtothesatisfactionoftheHighwayAuthority..1 ClosePlankingandStrutting Closeplankingandstruttingshallcompletelycoverthesidesofthetrench,generallywithshort,uprightmemberscalled'polingboards'.Theseshallbe250mmx38mminsectionorasdirectedbytheEngineer.Theboardshallgenerallybeplacedinpositionverticallyinpairs,oneboardoneachsideofthecutting. Theseshallbekeptapartbyhorizontalwallingsofstrongwoodataminimumspacingof1200mcrossstruttedasapprovedbytheEngineer.Thelengthandgirthofthestrutsshalldependuponthewidthofthetrench. Wherethesoilisverysoftandloose,theboardsshallbeplacedhorizontallyagainstthesidesoftheexcavationandsupportedbyvertical;'wallings'whichshallbestruttedtosimilartimberpiecesontheoppositefaceofthetrench. Thelowestboardssupportingthesidesshallbetakenintothegroundforaminimumdepthof75mm.Nopo
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