Mukupera kwaKurume wegore rino, nekuda kwekuparuka kuri kuwedzera tsoka mbiri mumavhiki maviri, vakuru veSeattle Dhipatimendi Rezvekutakurwa (SDOT) vakavhara traffic paWest Seattle Bridge.
Nepo vakuru veSDOT vakaedza kudzikamisa zambuko uye kuona kana zambuko raigona kuponeswa kana kana bhiriji richifanira kutsiviwa zvachose, vakabvunza mugadziri kuti ape zano pakutsiviwa kwebhiriji., Kana isu tave kukwanisa kuita zvigadziriso zvenguva pfupi kuti tivhurezve bhiriji nekukurumidza, asi mumakore mashoma anotevera, rutsigiro rwekugadzira ruchiri kudikanwa kutsiva bhiriji.“Mari yekondirakiti inotangira paUS$50 kusvika paUS$150 miriyoni.
Pakutanga, iyo New York City Qualification Requirements (RFQ) yemakambani einjiniya yaiita seyakaganhurirwa kune dzimwe nzira dzebhiriji.Nekudaro, sezvo rutsigiro rwenharaunda rwakawedzera, mainjiniya akarega basa Bob Ortblad akagonesawo New York City kuti ibatanidze dzimwe nzira dzenzira muRFQ.Guta reNew York rakagadzira apendix kune bepa rekubvunza, iro rinoti: "Dzimwe sarudzo dzichaongororwa sechikamu chechibvumirano, kusanganisira asi kwete kuganhurirwa kune tunnel uye inzwi rekushandura coordination sarudzo."
Sezvineiwo, vasati vazosarudza kuve ikozvino West Seattle Bridge, vakuru veSeattle vakafunga zvingangoita makumi maviri dzimwe nzira muna 1979, idzo nzira mbiri dzakabviswa.Dzinogona kuwanikwa muDzimwe Nzira 12 ne13 muFinal Environmental Impact Statement (EIS) yeSpokane Street Corridor."Nekuda kwemitengo yakakwira, nguva yakareba yekuvaka uye kukuvadza kwakanyanya, vakabviswa pakufunga."
Izvi hazvisi pasina kupokana, nekuti imwe nhengo yeruzhinji yakapinda muHarbour Island Machine Works yakataura nezveEIS: "Vakachera mugero kubva pasi nemutengo wakanyanya, uye hapana akapa chero manhamba.Zvino, ndeipi nhamba yandiri kubvunza, Kana kuti vakamboiedza?"
Iyo yakanyudzwa chubhu tunnel (ITT) yakasiyana zvakanyanya neiyo SR 99 tunnel.Paunenge uchishandisa "Bertha" (tunnel boring muchina) kugadzira iyo 99 tunnel, yakanyudzwa chubhu tunnel yakakandwa pane-saiti pachiteshi chakaoma, ndokutakurwa nekunyudzwa pasi pemvura yakaiswa mumvura.
Japan ine migero 25 yakanyura mumvura.Mumwe muenzaniso wemunharaunda weITT ndiyo George Massey Tunnel iri pasi peFraser River muVancouver, British Columbia.Mugero wacho wakatora anoti pfuurei makore maviri kuvakwa, kusanganisira zvikamu zvitanhatu zvekongiri, uye wakaiswa mumwedzi mishanu.Ortblad anotenda kuti mugero kuburikidza neDuwamish ichave zvakare inokurumidza uye inokwanisika nzira yekuvaka.Semuenzaniso, akapa 77 SR 520 pontoon inodiwa kuyambuka Lake Washington - mapontoni maviri chete akanyura anogona kuyambuka Duwamish.
Ortblad anotenda kuti zvakanakira tunnels pamabhiriji zvinosanganisira kwete chete kudzikisa mutengo uye kukurumidza kuvaka, asiwo hupenyu hwesevhisi hurefu uye kuramba kwakasimba kwekudengenyeka kwenyika.Kunyange zvazvo kuchinjwa kwemabhiriji muchiitiko chekudengenyeka kwenyika kuchiri kukanganisa kunyunguduka kwevhu, tunnel ine neutral buoyancy uye naizvozvo haina kunyanya kukanganiswa nezviitiko zvekudengenyeka kwenyika.Ortblad inotenda zvakare kuti mugero une zvakanakira kubvisa ruzha, kusvibiswa kwekuona uye kwezvakatipoteredza.Kwete kukanganiswa nemamiriro ekunze akaipa akadai semhute, mvura, aizi nhema nemhepo.
Pane zvimwe zvinofungirwa pamusoro pemateru anopinda nekubuda mugero uye kuti anokanganisa sei mafambiro enjanji yemwenje.Ortblad anotenda kuti kudzikiswa kwezvikamu zvitanhatu kubva muzana pamhedzisiro imhaka yekuti kudzika tsoka makumi matanhatu inzira ipfupi pane kukwira tsoka 157.Akawedzera kuti njanji yakareruka inopfuura nemukoto yakachengeteka zvakanyanya pane kumhanya njanji yakareruka pamusoro pebhiriji remamita zana nemakumi mashanu pamusoro pemvura.(Ini ndinofunga njanji yakareruka inofanira kubviswa zvachose kubva munhaurirano yedzimwe sarudzo dzeWest Seattle Bridge.)
Kunyange veruzhinji vakamirira kunzwa kuti Seattle DOT ichatsvaga zvimwe zvigadzirwa, zvakanaka kuona kuti veruzhinji vari kutora chikamu mune dzimwe nzira dzinoshanda.Ini handisi injinjini uye handizive kana izvi zvichashanda, asi zano rinonakidza uye rakakodzera kutariswa zvakanyanya.
Nguva yekutumira: Nov-02-2020