Construction and Inspection Report on Corrugated Polyethylene Pipe, N-12

Transcription

1 Transportation Kntucky Transportation Cntr Rsarch Rport Univrsity of Kntucky Yar 1989 Construction and nspction Rport on Corrugatd Polythyln Pip, N-12 L. John Flcknstin David L. Alln Univrsity of Kntucky, Univrsity of Kntucky, This papr is postd at UKnowldg. rsarchrports/613

2 Rsarch Rport KTC CONSTRUCTON AND NSPECTON REPORT ON CORRUGATED POLYETHYLENE PPE, N-12 by L. John Flcknstin Enginring Gologist and David L. Alln Chif Rsarch Enginr Kntucky Transportation Cntr Collg of Enginring Univrsity of Kntucky Lxington, Kntucky in coopration with Transportation Cabint Commonwalth of Kntucky Th contnts of this rport rflct th viws of th authors who ar rsponsibl for th facts and accuracy of th data prsntd hrin. Th contnts do not ncssarily rflct th official viws or policis of th Univrsity of Kntucky, th Kntucky Transportation Cabint, nor th Fdral Highway Administration. This rport dos not constitut a standard, spcification, or rgulation. Th inclusion of manufacturr nams and tradnams ar for idntification purposs and ar not to b considrd as ndorsmnts. Octobr 1989

3 Tchnical Rport Documntation Pag 1. Rport No. 3. Rcipint's Catalog No. KTC Govrnmnt Accssion No. 4. Titl and Subtttl 5. Rport Dat Octobr 1989 Construction And nspction Rport On Corrugatd Polythyln Pip, N Pl1orming Organization Cod 7. Autho s) L. J. Flcknstin, and David L. Alln 8. Prforming Organization Rport No.6 KTC Prforming Organization Nam and Addrss 10. Work Unit No. (TRAS) Kntucky Transportation Cntr Collg of Enginring 11. Contract or Grant No. Univrsity of Kntucky Fdral Aid Rsarch Task 35 Lxington, KY Typ of Rport and Priod Covrd 12. Sponsoring Agncy Nam and Addrss ntrim Kntucky Transportation Cabint Stat Offic Building Frankfort, KY Novmbr Sptmbr Sponsoring Agncy Cod 15. Supplmntary Nots Publication of this rport was sponsord by th Kntucky Transportation Cabint with th U.S. Dpartmnt of Transportation, Fdral Highway Administration 16. Abstract Construction and prformanc valualtions of N-12 pip. Construction procdurs, and fild obsrvations ar includd. 17. Ky Words corrugatd polythyln backfill 18. Distribution Statmnt Unlimitd 19. Scurity Classlf. (of this rport) 20. Scurity Classll. (of this pag) 21. No. of Pags 22. Pric Unclassifid Unclassifid 14 '-"-- -- Form DOT (8 72) Rproduction of compltd pag authorizd

4 EXECUTVE SUMMARY -'T±-hiS---r-port documnts-th-installat.ion and prformanc of N-12 pip installd during construction of South Forbs Road in Faytt County, KY 54 in Daviss County, and US 62 in McCrackn County. Th pip is manufacturd by Advancd Drainag Systms, nc., and is dsignatd as ADS N-12. ADS N-12 is a corrugatd high-dnsity polythyln (HDPE) pip. Th pip has a corrugatd xtrior for incrasd strngth and smooth intrior to provid maximum flow capacity and rigidity. Th N-12 pip rquirs lss quipmnt and fwr prsonnl than stl or concrt pip for installation. Mor car must b xrcisd in placmnt and backfilling of N-12 pip. Th crushd No. 9, ston usd on Forbs Road and th sand backfill, usd in Daviss County appard to work wll for N-12 installations. No dflctions wr apparnt during visual inspctions at ithr sit. Svral of th pips on US 62 in McCrackn County showd signs of comprssion aftr installation. Th pip was inspctd som tim aftr backfilling had bn compltd. t appars th dflctions notd within a numbr of th pips wr du to havy quipmnt running ovr th pips having minimum soil covr. Som sttlmnt was noticabl in a gravl driv. Futur inspctions in McCrackn County, on US 62, will hlp clarify if any of th dflctions in th ntranc pips could b du to normal traffic loading or du to impropr installation. From visual obsrvations at all thr sits, it is apparnt th nds of th pips at th couplings ar rarly buttd compltly togthr. This prmits matrial to b dpositd in this ara. Car should b takn during construction not to damag th plastic pip during transportation.

5 NTRODUCTON This rport documnts-th ins lallation and pifm manc of N-12--pip-inst<tl.ld---durin g'" - construction of South Forbs Road in Faytt County, KY 54 in Daviss County, and US 62 in McCrackn County. Th pip is manufacturd by Advancd Drainag Systms, nc., and is dsignatd as ADS N-12. ADS N-12 is a corrugatd high-dnsity polythyln (HDPE) pip. Th pip has a corrugatd xtrior for incrasd strngth and smooth intrior to provid maximum flow capacity and rigidity. Th purpos of th study was to valuat th prformanc of th pip during construction and aftr placmnt. FORBES ROAD NSTALLATON n Novmbr of 1987, th first sction of N-12 pip installd in Kntucky was along Forbs Road in Faytt County. Th pip was installd in two locations. Th first was 28 ft right of Station Th 15-inch N-12 was usd as an ntranc pip. Th ntranc pip was backfilld with approximatly on foot of matrial. Th scond location starts at a storm swr inlt and runs 240 ft north to a manhol; this N-12 is usd as a 15-inch culvrt. Th pip was backfilld with No. 9 ston to approximatly on foot abov th top of th pip. Th rmaindr of th trnch was backfilld to grad lvation with xcavatd matrial. Th maximum fill hight was approximatly 6 ft. Th pip was visually inspctd on Novmbr 19, 1987, and Sptmbr 21, Random masurmnts wr takn of th intrnal diamtr of both pips. Th masurmnts indicatd thr had bn littl to no distortion of th pip diamtr sinc construction. Th pips also wr inspctd for chmical or physical dtrioration or dfcts. Th inlt, outlt, and manhols wr xamind and photographd. Thr wr no signs of dtrioration or wakning of th N-12 pip. Both drainag systms wr inspctd for potntial clogging. No signs of clogging wr obsrvd. Th ntranc pip had approximatly 2 inchs of organic matrial in th first 6 inchs of th inlt in Th 1989 inspction rvald lavs and papr products accumulating in th nds of th pips. Th accumulation of matrial appard to b du to an impropr grad of th ditch at th outlt nd. KY 54, DA VESS COUNTY Construction nspction During th rlocation of KY 54, in Daviss County, approximatly 468 ft of 15-inch N- 12, and 592 ft of 18-inch N-12 wr installd. Tabl 1 includs th location of ach pip sction, lngth, and pip siz. 1

6 Tabl 1. StiGB (inchs) oo.g:th (ft) RT LT LT LT ' LT ' LT LT RT RT LT RT RT Th projct bgins at Station and nds at Station Th first sction of N- 12 pip was placd May 18, 1988, at Station Approximatly 104 ft of 18-inch N- 12 wr placd at that location. Th trnch was backfilld with a coars, clan sand approximatly midway up th pip, and compactd with a vibratory tampr. Th rmaindr of th trnch was backfilld with xcavatd matrial (Photo 1). Photo 1. Compacting sand backfill around 18-inch N-12 pip in Daviss County. 2

7 Prior to installation, it was obsrvd that a numbr of th pip sctions had bn cut during construction. t appard that th sctions had bn damagd during transport with a backho. Th damagd sctions wr rturnd to th manufacturr for inspction (Photo 2). Photo 2. Damagd 18 inch N-12 pip. During construction inspction, it was apparnt th pips wr bcoming cloggd du to th tim intrval btwn placmnt of th pip and th hadwall (Photo 3). Photo 3. Siltd pip in Ownsboro. 3

8 Monoritoring Points Two sts of monoritoring points wr placd in th pip at Station prior to installation. Th monoritoring points wr placd at 41 ft and 61 ft from th outlt. Th points wr monoritord thr tims in 1988 and on Sptmbr 18, Sinc installation, th intrior of th pip at 61 ft had dflctd approximatly 0.42 inch, and approximatly 0.25 inch at 41 ft (Figurs 1 and 2). Th fill hight abov th 61-foot monoritoring point was 6 ft, and th fill hight at th 41-foot monoritoring point was 8 ft. Monoritoring points wr also placd at Station Sinc installation, th intrior of th 18-inch pip has dflctd 0.34 inch (Figur 3). Eight additional monoritoring points wr placd in th pips prior to installation. Du to watr and mud, th monoritoring points could not b accssd during th last inspction. Visual nspction All pips, including th 18-inch and 15-inch wr inspctd and photographd. All appard to b symmtrical. On Jun 18, 1988 during th inspction of th 104-foot, 18-inch pip at Station , a rip or cut was notd in th smooth intrior lining of th pip. Th rip follows on of th corrugations and is approximatly svn inchs in lngth (Photo 4). Th rip was closly inspctd again on Sptmbr 18, Th rip appard to b approximatly th sam lngth and had bulgd approximatly a on half-inch. Photo 4. Rip or cut insid an 18 inch pip. 4

9 Th intrior of a 216-foot 18-inch pip was inspctd in dtail on Sptmbr 19, 1989, from Station to Each 20-foot sction was photographd and visually inspctd. Th pip appard to b clan and symmtrical. A four-inch gap was discovrd btwn th first and scond joint south of Station (Photo No. 5). t was apparnt that th sctions wr not compltly buttd togthr at th tim of installation. All othr joints wr inspctd and thir conditions wr rcordd. Th nxt largst sparation was on inch. A on half-inch sparation was fairly common throughout th pip sction. Photo 5. Four-inch sparation btwn th two conncting pip nds at th coupling. Larg amounts of soil and rock had bn dpositd in two of th pips lading to th manhol at Station t is apparnt th matrial had ntrd during construction through th gratd inlt adjacnt to th manhol. Photo No. 6 and Photo No. 7 shows th two partially cloggd pips. 5

10 Photo 6. Partially cloggd 18-inch pip. Photo 7. Partially cloggd 15-inch pip. 6

11 US 62, McCRACKEN COUNTY On Sptmbr 18, 1989, all th ntranc and culvrt pips wr visually inspctd and photographd. Th sizs of th pips installd wr 15, 18, 24, and 30 inchs. Svral of th pips showd signs of comprssion. t appars th pips had bn rndrd irrgular g---<dufin---bakfill OJ)r-at4Gn&.---Appndi* A is an--insption--lg-of-affi--pip.-f llwing-is-a-collction of photographs having captions dscribing th conditions of th pip. Photo 8. Comprssion in a 24-inch ntranc pip at Station Photo 9. nloadr tracks ar prsnt in th thin soil covr abov th comprssd pip (Station ). 7

12 Photo 10. Pip dflction at Station (18-inch pip). Photo 11. Comprssion in a 24-inch ntranc pip at Station

13 Figur No.1: 18-lnch N-12 Ky 54, Daviss County, Station w p i 18.4 p Diamtr in inchs 18.3 D i a m t r 18.2 Horizontal Vrtical n 17.9 c 61 ft from th outlt h 17.8 s Tim (days)

14 .. Figur No.2: 18-lnch N-12 Pip Ky 54, Daviss County, Station p i 18.4 p Diamtr in inchs 18.3 D i a m t r Horizontal 18.0 Vrtical n 17.9 c h 41 ft from th outlt 17.8 s Tim (days)

15 Figur No. 3: 18-lnch N-12 Ky 54, Daviss County, Station p i p D i a m Diamtr in inchs Horizontal t 18.5 r n Vrtical / c h s Tim (days)

16 Discussion Th N-12 pip rquirs lss quipmnt and fwr prsonnl than stl or concrt pip for installation. Mor car must b xrcisd in placmnt and backfilling of N-12 pip. Th crushd No. 9, ston usd on Forbs Road and th sand backfill, usd in Daviss County appard to work wll for N-12 installations. No dflctions wr apparnt during visual inspctions at ithr sit. Svral of th pips on US 62 in McCrackn County showd signs of comprssion aftr installation. Th pip was inspctd som tim aftr backfilling had bn compltd. t appars th dflctions notd within a numbr of th pips wr du to havy quipmnt running ovr th pips having minimum soil covr (for xampl, Station ). Som sttlmnt was noticabl in a gravl driv at Station 174. Futur inspctions in McCrackn County, on US 62, will hlp clarify if any of th dflctions in th ntranc pips could b du to normal traffic loading or du to impropr installation. From visual obsrvations at all thr sits, it is apparnt th nds of th pips at th couplings ar rarly buttd compltly togthr. This prmits matrial to b dpositd in this ara. Car should b takn during construction not to damag th plastic pip during transportation. 12

17 APPENDX A US 62 N-12 PPE NSPECTON 13

18 STE No.1 No. 2 No. 3 No. 4 No.5 No. 6 No. 7 No. 8 No.9 No. 10 DESCRPTON 18-inch ntranc pip slightly irrgular 24-inch ntranc pip (Station ). Approximatly 2.3 inchs of dflction at th pip connction. Som sttlmnt is obsrvd in th gravl driv abov th pip. Approximatly 1.5 ft of covr at th south nd of th pip, south sid of th gravl driv. Th pip sctions ar not compltly connctd. 18-inch ntranc pip (Station ). Th pip has approximatly 3 inchs of covr at 6 ft north of th south nd. Approximatly 2 inchs of comprssion is noticabl at this point. nloadr tracks ar also prsnt on th surfac at this point. 18-inch ntranc pip (Station ). Slight bow is prsnt at th joint in th pip. Ovrall installation looks good. Asphalt surfac has bn placd within 1 to 2 inchs of th top of th pip. 18-inch ntranc pip (Station Highland Road). Th installation is in good condition. 24-inch ntranc pip (Station ). Approximatly 2 inchs of comprssion on th south nd. Approximatly 4 to 4.5 ft of fill. Pip dos not appar to b bddd on sand or crushd ston. 24-inch culvrt pip (Station ). Good installation. 30-inch culvrt pip (Station ). Slight vrtical dflction approximatly 25 inchs from th ast nd. Fairly good shap. 15-inch ntranc pip (Station ). Truck ntranc for Turnr Dairy. Half full of soil. Not much dflction. 15-inch ntranc pip (Station ). Half full of soil. Littl to no dflction. 14