HARRIS COUNTY PUBLIC INFRASTRUCTURE ENGINEERING …

1 HARRISCOUNTYPUBLICINFRASTRUCTUREENGINEER INGDIVISIONGUIDELINESFORENGINEERSHAVINGE NGINEERINGCONTRACTSWITHHARRISCOUNTY, , JR., 'COURTAUGUST23,1988j:\perm\ ,1988 GUIDELINESFOR ENGINEERSHAVINGENGINEERINGCONTRACTSWITHH arrisCounty,TEXAS FORTHEDESIGNOF ROADSANDBRIDGES "-' ,[r.,PExecutiveDirector\-t< ,~Cc u",~f" 'e~ :",~..~~. <..,~-\ ~~~:tdel',""eos,.::..,r:.. "\/, :~'$ (~/9"..,..\\hcedadmn\sys\data\docs\penn\ ~e=, "dgeDesignRequirements7-9 SectionIIIP avingDesignRequirements10-11 SectionIVGeometricDesignRequirements12-1 5 SectionvTrafficDesignandRight-of-Way17-1 9 AcquisitionRequirementsSectionVIDrainage andStormSewerDesign20-24 RequirementsSectionVIIS anitarySewerDesignRequirements25 SectionVIIIW aterlineDesignRequirements26 SectionIXUtilityInformationRequirements2 7-29 SectionXConstructionDrawingRequirements3 0-47 SectionXISpecificationRequirements48-53 Appendix54-:5 BridgeLayoutChecklist56-:7 Presentedherewitharethedesignguidelinesf orengineer::;havingengineeringcontractsf orthedesignofroac9:sandbrid,?)]

2 ,theseroadsw~ ,theseguidelinesdonotaddressthl!!designo froadsandbridgeswithin' ~rewaterlinesandsanitarysewersareapartof thedesignoftheroad,theyshallbedesignedin accordancewiththe"GeneralDesignRequire~e ntsforSanitarySewers,StormSewers,Waterli nesandPaving" ,usingtestresultsprovidedbyasoilstesting ~aboratory, "AASHTOG uideforDesignofPavementstructures".Allli nimumpavemant; , ,whether-forflexiblebase, ,amaximumlSD-footwidestrit:eachsideofand adjacenttotheproposedroadright-of-way,ex ceptfordevelopedareasdrainedelsewhere, ' :, ,apreliminaryreportshallbesubmittedtothe countyEngineeras; ~strip,anexplanationastowhyitisincludedi nthedrainageare~c:, ,.. ::::"yEngineeringReportforHarrisCounty,h eshallfollowthe' ':Engineershouldmakeeveryefforttoexplore allpossibilities,conflictsandalternateso lutionswithassociatedcostsandma)<: ~ ,theEngineermustanalyzealJfacetsofthepro jectconsideringthespecificreguirement:;~ :=ganizedmannersuchthattheCountycanmaket herequirE!

3 :Thefirstpartofthereportshouldoutlinethe authorizatic>!Lfortheproject, "project, !balanceofthereportshouldcontainthediscu ssionandexhibi1:.~;andwouldcomprise' !discussionshouldaddressallphasesandphas ingofthepzoposedconstruction,outliningju stwhycertainalternativeswereenosenoverot hersandresolvingallconflictsassociatedwi ththt~ ,maps,drawing!s, :-Limitofprojectandauthorization( ,BondYear,etc.)-Descriptionoftypicalsect ion,numberandtypeofbridges,outfallstorms ewers, (TopographicandGeologic)faUlting,informa tion,vegetation,averagelandproject, .:l'.:l4=''+o\..1 .. ~.; ,..e r , :,~ :,,; 'ofinle~s, 'constructioncostestimate, ",' '!:spertaintothoseperformedintheactualco ns~ructionofthnprojectandarenotanestimat eoftheengineeringcostsfC: , ,:!anestimatedcostofproposedrig~ :! ,includingexistingeasements.:.Provideest imatedcostc:) ' , , :::(tobepaidforbyHarrisCounty). ,expandonthepavementdesign(beyondthatint hesoilsreport)describin;thicknessofeachl ayerandmaterialsofconstruction(including reinforcing,ifconcrete),typeofsubgradetr eatmentwithdepthandpercentoflime, ,orcementasspecified,typicalsectionsonro adway,ditchesandoutfalls, ,spannumberandlengths,substructurelimits andtype,width,100yeazfloodelevationandbo ttomchordelevation,existingar.

4 , :20horizontaland1:2verticalscaleforplan/ profilesheets,vicinitymap,drainacl'emap, typicalsectionsandlayoutofmajorprojectit eIlls:,.Drawingsmaybereducedto11"x17".. , ,alongwit:hsizes,locations,limitswithinr ights-of-way,elevaticmsandnamesofOwner, ,tocommercialestablishments, ,verifiedinthegeotechnicalrepor:,usedint heAASHTO~ , :1gbars,usingthesubgradedragequationands izelendtransferdevices, ~gcalculationswhichsupporttherecommendat ionsforpavi~ ;s,'throughoutalldrainageareas, ;andnumerically0=i:1profileincludeahydra ulicgradientwithaprofileC: ,stationand offsetofmanholesandinlets, ,drainagefacilities,utilities,POWI~:::'p oles,:buildings, ~the'proposedright-of-w, ;pipe,centerlineofroadprofile, ' ,manholes,inlets,outfallstructuresIflowl inesandtopofstormsewer, ,planscaleshall:be1"'=20'.Profilesscales shallbe1"=20' "=2'. ,indicati~,gforcontinuationcfL,FEMA hasestablishedbenchmarksonCountybridges; , :benchmarksaretoberelocatedduringconstru ction,theyshallbe5" :f.

5 ~rpcseandScopeProjectLocationBridgeDescr iptionandCostAnalysisRecommendationsandD esign..ProjectCostEstimateExhibits-Cover sheetwithVicinityMap-TopographicSurvey-P roposedBridgeLayoutandRoadside Drainage-PlanandProfile-TypicalTransvers eDeckSection,RailingDetails-OtherDrawing sRequired~ ~icalInvestigations-FieldNotes-Engineeri ngReferencesThefollowingisthesuggestedou tlineofatypicalreportforaroad- ~ ~~.Appendices-GeotechnicalInvestigations -EnqineeringReferences-6- .SECTIONIIBRIDGE DESIGNREQUIREMENTSSECTIONIIBRIDGE DESIGNREQUIREMENTSLA llbridgesaretobedesignedtoaminimumAASHTO H20CJ~ ~retobeinaccordancewiththE!latestedition ofthe" !.~~Bridges", ~widthofbridge,facetofaceofcurbsiistobee qual1:0theouttooutdistanceoftheapproachi ngroadpavemerrcplusfourfeet, ~boulevardsshallhaveone6-footclearwidths idewalk(:)]' :approachpavement, (a)above, (c)above, ,unlessspecificapplicationsrequireotherm aterials, , ~ ,thefollowingitemsshouldbeaddressed.

6 'dataan= ,evenwithoutaverticalcurve,deck,bentsan= .Ifpossible, ,theEngineershallprovideatrafficcontrolp Lan,"willthedetourrequireaconstructionea sement? , ,oraremUltiplephasesrequired? :yearfloodelevationAlso, , , , \oiallsshouldbedesigned'separatefromtheb rid9E~,withtheirownsupports.' (minimumof1"assured.(minimumof3")6") :f' '9" ; ~ , "landverticalcontrolfeatures0:1thedrawin ~ ,estimatedlengths, .Theycanonlybegintheirprograminanefficie ntmanneraftertheyhavereceive~fromtheCons ultantapreliminarybridgelayoutinenoughde tailthatindicatesexistingtopography,purp ortedandultimatechannelwidthsanddepths,b ridgelimits,spans, ~ ,SECTI< , ,semi-rigidc=rigidpavementsshallbebasedo nthelatestrevisionofthe"AASHTOG uideforDesignof Pavementstructures".(Note:T'he~atestguid eiscopyright1986.) , 'stabilization, (lime,flyash,etc.) "f'theproposedpavementsubgradE!.Flexible basepavementdesignshallbebasedontheCalif orn.

7 " :ytestresultsmaybederivedfromothertypeso ftestsactual:.yperformedonthesoil,provid edthereexistssuitab:. ~;.Anacceptablesubstitutionfortheplatebe aringtestwouldbeacorrelationbetweentheSD HPTT riaxialtestvalue,andmodulusofsubgraderea ction, "theultima':eresponsibilityoftheDesignEn gineertostipulate1::hepavementsectionith efinalchoiceofthepavementdesiqnshouldbeh isdecision,withtheCounty ~thoroughfaresmustbedesignedonthebasisI: > ,R,of95%. 7dayconcretepavementflexuralbreakstrengt hoj:aminimmn500psibythethird-pointloadin gmethod,usingaminimmnof5-1 ,..a11:~the::lexibleusedinThefollowingla yercoefficientsforsemi-rigidpavementmate r; ~~ (BlackBase) .. 't;one..0 ..0 .. !5 LimeStabilizedEarth .. ,aRegionalFacti:> ':' (ifsub-baseisused) ..4inchesTheEngineerisrequiredtosubmital lcalculationsforpavementdesigntotheCount yEngineerforreview,prior" , ,geometricdesignshallbebasedont.~e"Guide linesforUrbanMajorstreetDesign" ,geomet= nshallalsobebasedonthe"GeometricDesignGu idelines:f'crS'ubdivisionStreets" ,turnouts, , ;,-"".

8 ,.~(!'f'"Y,.. ' '.. , , : "TexasManualcnUniformTrafficControlDevic es", , (backtobackofcurb) (backtobackofcurb) '-6" ,turnouts, "T"intersectionwithastreetthathasnotbEHm improvedtoitsultimatewidth,concretepavem entshou:.dbestoppedeitherattheright-of-w aylineorattheendofthecurbreturn,whicheve rwouldrequirelessconcrE!1 :=nou~sareplacedwhereane~is~ ,thetu=noutshouldbesizedtofittb.~ultimat epavementwidthandthentransitionedtoth.~ (::lstreetis50-feet.:tfthestreetisshello rasphal"::surfaced,thetransitionshouldbe aminimumofS-inchle~:;ofcementstabilizeds hellorapprovedequal,and1-1 ,th, , , ;In:theeventthatthisconstructioncreatesa situation-inwhichthetrafficontheexisting streetwillbesubjecttoridingconditionsatt hepostedlimitplUS10mph,Wherebythemovingv ehiclewillbottomoutwhencrossingthepropos edstreetintersection, , ,culverts; , ' ~edirectionstoa commoninletshallbe1% ,fromgutterflowlineoredgeofpavement,tona turalgroundattheright-of-way:_:~:Lllesha llnotexceed13percen~.))

9 - , ~ic~ ,tiesshallbemade'toexistin; ' acurbandgutterintersectsadrainageditch, .Whenmeetinganexistingcurbedstreet,topof cU!bgradesshouldbelaidtomeetanelevation3 -inchesabovethegutter, . , , :clropen, ,Thegradientfortangentstoverticalcurvesa trailrc)c, , ,Gutterelevationsarerequiredforverticalc urveswhE~J~ :hepavementslab,verticalcurvesshouldbeca lculated:El)reachcurblineandshouldbepost edat10 ~ ~ ~endofpavementinordertoeliminatedrainage fromthepavementgutterintoanopenditchwhen the~ ,howeve=, :t,showlocationsandtypicalsectionsonthep lansandpcst;acenterlineforthedrivewayatt hepropertylinewithelevationforeachdrive. ". ~ ,forsomereason,a-greaterspee-dlimitisall owed, ,plain,.16-incheslon~r,embeddeda -inchesandAsanalternativetotheabove,sawc utandremCJ' " ~ :..-tendedinthe::'.:.t1.:.:::-=shallhave l5-inchesofreinforcingsteelexposedbeyo:: ;'I,ithepavement,coatedwithasphaltandwra ppedwithburl.

10 Asphaltdrivesshallbeaminimum2-inchType"0 "HMH:"asphalticconcretesurfacematerialon aminimum6-inche;;ofblackbaseover6-inches oflimeorcementstabilize:lsubqradecompact edto95percentofstandardp "TexasManualonUniformTraffi=ControlDevic es"aspublishedbythe'I'exasDepartmentofHi ghwaysandPublicTransportationshallbestri ctl~ ,theexpansionjointshallbecarriedtotherig ht-of-wayline, ..SECTIO~VTRAFFICDESIGNANDRIGHT ~RZMENTSSECTION VTRAFFICDESIGNANDRIGHT OFWAYACQUISITIONREQUIREMENTSD eterminationofright-of-wayacquisitionsho uldbebasedemultimategeometricdesign,'ali gnment, !consideredindeterminingright-of- (limitedtoreplacementofexistingwalksonly unlessspecificallyinstructedotherwisebyt heCountyEngineer) ,Schools,hospitals,shoppingcenters, ,minimum30 mphbutlessthan45mph, 35feet; ,35feetwithrig'htturnlanes, (seegeometricdesignrequirements) ,1959 Whereapplicable,the"RoadwayDesignStandar ds",prepared1:IytheCityofHoustonTraffica ndTransportationDepartmerlt.