HOBAS NC Non Circular Pipe Brochure & Dimensions

Profile formsrrr/2 r/2rr/2H=2rDN Theoretical A Lcross section mm sq m m1,6001,8001,5431,7361.8692.3663.003.00r/2B=2rrDN Theoretical A Lcross section mm sq m mr r3r/23rr/2B=2rH=3r300/500400/600500/750600/900680/1050800/1200900/13501000/15001200/18001406/1907407506632758875101111361262151516660.1300.1840.2870.4140.5610.7350.9301.1481.6542.1782.502.502.502.503.002.502.502.503.003.000,917rDN Theoretical A Lcross section mm sq m mr0,583rr r rr/2H=3,6r480/800510/810400/1000750/15001100/14001080/16501600/180065067175311821271137617240.320.340.431.081.241.422.312.602.502.002.502.502.502.50B=2rDN Theoretical A Lcross section mm sq m m3r/2r7r/4H=2r1360/15702680/2590146926181.5965.1702.002.30r 3r/40,5rB=2rOther shapes available on request.The information and recommendations herein reflect our knowledge at the time ofpublication. They do not however constitute a warranty of any kind, express or implied.Details should always be checked and adjusted for individual projects, if necessary.HOBAS Rohre GmbH reserves the right to change specifications without prior notice andassumes no responsibility for errors or omissions.4

Rehabilitation of an egg-shapedinterceptor in HildesheimBerlin-Steglitzstorm sewerThe first sewers were built in thenorth German town of Hildesheim in1860. Given that the municipal networkwas designed as a combinedsewer, egg-shaped pipes were theoptimum solution for many sections.The interceptor requiring rehabilitationin the Langer Garten road was installedin 1906 and made of concretewith a bottom lining. An egg-shapedpipe with a cross-section of DN 800/1200, its bottom depths ranged from4.42 m to 9.34 m. It is primarily usedas a storm sewer for an industrial area,but wastewater from a paper mill isalso discharged into the pipe at times.Following sewer inspection, thedamage was classified as „old pipecondition II“ to ATV M 127.A groundwater level of 2.60 m abovethe bottom of the old sewer also hadto be taken into consideration for thestructural dimensioning of the liner.Egg-shaped DN 680/1050 pipes witha wall thickness of 10 mm wereselected for rehabilitation. They wereinserted separately into the oldsewer through a short shaft at theend of the relining section. Afterbeing joined, each pipe was preventedfrom floating at the crown ofthe old sewer.The lengths of 2.0 m and 3.0 mcombined with the simple jointingsystem enabled the liner pipes to belaid rapidly. As a result, installationwas completed within six days. Thestorm sewers from the variousproperties were connected to theinterceptor with laminate hand layup.To check leak tightness, the linerwas then filled with water. Finally, theremaining annulus between the linerpipe and old sewer was completelyfilled with special cement (grout).Intensive use and high traffic loadsin the Berlin district of Steglitz-Lichterfelde Ost resulted indeterioration of a concrete stormwatersewer (hood cross-section1560x1770 mm). In view of thedamage detected and the loadconditions, the HOBAS NC Line Pipeswere calculated on the basis of „oldpipe condition II“ to ATV M 127 Part2. They were then manufacturedusing a calibration template that wasa replica of the old pipe shape. Twometerlengths were laid in the straightsections of the sewer and one-meterlengths in the curved sections.HOBAS NC Line Products DN 680/1050 forRelining stored in front of the access shaftHOBAS NC Line pipe installationThe HOBAS pipes were joined withpush-on couplings bonded in place bylaminate hand lay-up. Precautionswere also taken during installation toprevent flotation. After tightnesstesting to DIN EN 1610 procedure„W“, grout was injected section bysection.View into the rehabilitated sewerRehabilitated sewer with DN 200 laminatedinlet5

2. Operating conditionsType of sewagesDomestic Rain water Storm water MixedIndustrial wastewaterMax cover depthLoadsMin cover depthTraffic loadMax. traffic load in n/mm²GroundwaterGradient (in mm/m or %)Depth abovepipe crownMindepthHydraulic conditionsNew gradient, if requiredMaxdepthRequired flow rate (m³/sec)Native:soil groupAlternative: deflection modulus (N/mm²)Shaft diameterOne-part sectionsWall thicknessLength of sectionsSoil conditionsAccesMin manhole DNRequired rehabilitatonSeveral-part sectionStraigthCompactionCavitiesInserts (e.g. channel)CurveType of jointBellTongue and grooveMechanical propertieswith/without gasketwith/without gasketElastic modulusShort-termGroutingLong-termPropertiesDensity [kN/m³]Filling depthComponentsHydraulic calculationKsFlow capacityShipping requirementsNotes7

HOBAS WorldwideHOBAS AGSWITZERLANDHOBAS MANAGEMENT GMBHAUSTRIAHOBAS ENGINEERING GMBHHOBAS ENGINEERING + ROHRE AGAUSTRIASWITZERLANDHOBAS ROHRE GMBHHOBAS BENELUX NV/SAHOBAS SYSTEM POLSKA SP. Z O.O.NGERMANYNBELGIUMNPOLANDHOBAS FRANCEHOBAS BENELUX BVHOBAS PUTKET OYNFRANCENTHE NETHERLANDSNFINLANDHOBAS CZ SPOL. S R.O.HOBAS HUNGARIA KFT.HOBAS SK SPOL. S R.O.CCZECH REPUBLICCHUNGARYCSLOVAK REPUBLICHOBAS BULGARIA EOODHOBAS PIPE SYSTEMSHOBAS HELLAS LTDCBULGARIACROMANIACGREECEHOBAS ROHRE GMBHHOBAS TUBI S.R.L.HOBAS REPRESENTATIVE OFFICE ZAGREBSAUSTRIASITALYSCROATIAHOBAS PIPE USAHOBAS AMERICA LATINA, LTDA.USABRAZILJOINT VENTURESHOBAS TAPO AOZTÖZDEMIR HOBASEASTERN HOBAS PIPES CO., LTD.UZBEKISTANTURKEYHOBAS SCANDINAVIA ABTHAILANDNSWEDEN+49 (0) 3 95 45 28-0LICENSE PARTNERSUNITED KINGDOM AUSTRALIA SPAIN EGYPTJAPAN UNITED ARAB EMIRATES CHINAKAZAKHSTANNC_E 7/2004N = HOBAS North C = HOBAS Central S = HOBAS SouthProduction Facility8HOBAS Engineering reserve the right to change the technical specification without notice.HOBAS Rohre GmbHHellfeld/Gewerbepark 1 · 17034 Neubrandenburg · Germany · Phone +49 395 4528 0 · Fax +49 395 4528 100 · E-mail hobas@hobasrohre · www.hobasrohre.de