The Blair Street Bridge

Ponto Blair Street ko pont gonɗo e beton e njamndi, gonɗo e laawol mawngol Lyell rewrude e wuro New Norfolk, rewrude e maayo Derwent to Tasmanie, to Ostarali. Ko ɗum woni jokkorgal yah-ngartaa mawngal e nder njuɓɓudi wuro ngoo, pont oo ina waɗi laawol gootol[3] ngol laabi kuutorteeɗi renndini ceertuɗi banngeeji ɗiɗi ɗii kala.[4] Timminii e hitaande 1974, ko ngol woni ponto nayaɓo mahngo to New Norfolk, tawi ƴellitaare ndee ina foti daranaade ilam e nder falnde hade mum sosde weiruuji Meadowbank.[5][note 1]

Tariya

Ko ɓuri anndeede ko "Ponto Norfolk keso", ko nanndi e ɗuum, pontooji joɗɗinaaɗi to New Norfolk ina njogii daartol keewngol gila e fuɗɗoode teeminannde 19ɓiire. Ponto leɗɗe gadano mahaaɗo e maayo Derwent to laawol Bridge, sara pont Blair Street hannde oo, timminaama e hitaande 1834.[7] Ndeeɗoo pont ko ƴellitaare mawnde, jokkondirnde New Norfolk e diiwanuuji taariiɗi ɗum ko adii fof, ina weeɓna yah-ngartaa e njulaagu. Nde mahiraa ko e gardagol balloowo seneraal William Sharland, jeyaaɗo e hitaande 1825 jeyi anndiraaɗo Woodbridge. Toll mooftaama ngam taccude pont oo, haa jooni ko e lewru juko hitaande 1880.[8]

Toll House mahiraa ko e hitaande 1841, ina moofta njoɓdi haa hitaande 1880.

Maayo Derwent ina heewi ilam[9] e nder yontaaji, pontooji garooji e hitaande 1880[10] e 1931[11] mahaa ko sara nokku gooto.[12][13] Heddiiɓe e ponte tati gadane ɗee, ina heen geɗe ummoriiɗe e mbaydi asliiji 1834 e kaaƴe ɓoornaaɗe caggal ɗuum ɗe Victoria ɓoornii e pont ɗiɗaɓo oo, ina mbaawi yiyeede haa jooni sara Woodbridge to joofnirde Bridge Street.

Ko adii mahngo ponto Blair Street, wuro New Norfolk tuugnii ko e ponto njamndi e beton ɓooyɗo mahaaɗo e hitaande 1931 ngam wallitde yah-ngartaa e maayo Derwent.[14][15][16] Kono noon, ngool ponto ina ɓeydoo waasde jogaade doole ngam heblude ko ɓeydotoo e ɗaɓɓaande njulaagu hannde, sibu ina sikkaa ko doole mum ŋakki, njaajeendi mum ina famɗi, e keerol jolngo 15 ton (15 ton juutngol; 17 ton juutngol) ngol ɓe ndokki e hitaande 1966.[17] E anndude haaju taƴgol maayo ɓurngol tiiɗde e moƴƴude, peeje mbaɗaama ngam mahngo pont keso.[17]

Mahugo

Pewnugol ngol fuɗɗii ko e lewru ut 1971, ngol joofi ko e nder duuɓi ɗiɗi e feccere e njoɓdi 900 000 dolaar Amerik.[18] Golle fenaande leɗɗe mballitii heɓde pier maayo e nder mahdi.[19] Foundations ina kuutoroo footings yaajɗi ngam abutments e piles driven ngam piers, ngam tabitinde darnde e ustude baasal koɗki. Design ina teeŋtina darnde juutnde e banngeeji ngam waawde haɓaade ilam e nguleeki bonki. Feereeji estetik, ko wayi no balustrading minimalist e annoore, ina ɓeyda njiimaandi pont oo.[20] Injiniyankooɓe ndiyam ƴeewtindorii geɗe ko wayi no ɓuuɓri maayo, tolno ndiyam, e sifaaji nokkuuji ilam ngam anndude no pont oo waawirta ɓuuɓde e sahaaji ndiyam toowɗam.[6]

Ngam ustude baasal ilam baawzo battinde e pont oo e laabi mum, geze diisnondiral keewze naatnaa e eɓɓaande pont Blair Street. Ina jeyaa e ɗeen geɗe ƴellitde dekirɗe pont oo haa to tolno toɗɗaaɗo dow tolnooji ilam potɗi reweede ɗii, tawa ina addana ndiyam ɗam rewde les mum tawa bonnataa e mbaydiiji ɗii. Yanti heen, jolɗe e jolɗe pont oo ina tiiɗtinaa ngam waawde haɓaade doole ndiyam ɗe ndiyam ilam waɗata.[21]

Pont Blair Street timmuɗo oo ina waɗi 200 meeter (650 ft) e njuuteendi mum ko 35 meeter (116 ft) dow maayo ngoo.[3] Ina waɗi nate beton tiiɗɗe ngam dartinde e jolɗe njamndi ɗe Russell Allport & Co to Moonah feewni. Design pont oo ina waɗi 4,74% e ŋorol ngol, ina weeɓi haa 3% e ŋorol gonngol e dow laawol Montagu,[22] ngam tabitinde semmbe e jolɗe teeŋtuɗe e nguleeki bonki.[23]

Nafoore

Nde nde timmi, pont Blair Street hollitii yahrude yeeso no feewi e nder njuɓɓudi wuro ngoo, rokki kisal, njuɓɓudi, e wellitaare wonande hoɗɓe e hoɗɓe. Ponto Blair Street oo ittii caɗeele ɗe njuɓɓudi ɓooyndi ndii joginoo, rokki otooji e yahooɓe laawol ngol aldaa e keerol, tawa kadi ina ɓeyda jokkondiral hakkunde nokkuuji ɗiɗi mawɗi ƴellitaare wuro ngoo.

Teskorɗe

Maayo Derwent yanii no feewi to New Norfolk ñalnde aset 23 abriil 1960. Ina hiisa wonde ngool ilam ina fotnoo wonde ilam gootol e nder duuɓi capanɗe joyi, tawi ina yahra e 120 000 cusec