Nrog rau kev nrawm ntawm nroog loj, cov kav dej galvanized steel thiab cov kav dej zoo tib yam feem ntau cuam tshuam los ntawm corrosion thiab to, thiab tsis tuaj yeem ua tau raws li cov kev xav tau niaj hnub no. Cov kav dej hlau, nrog rau lawv cov kev ua tau zoo tshaj, tau dhau los ua qhov kev xaiv tseem ceeb rau kev hloov kho cov kav dej. Kab lus no txheeb xyuas lawv qhov zoo li qhov hloov pauv ntawm qhov kev xav ntawm cov khoom siv thiab cov txiaj ntsig kev lag luam.
Kev sib piv ntawm cov kav hlau kav hlau thiab cov kav hlau hlau
Corrosion Resistance
Cov kav hlau hlau yog nquag rau electrochemical corrosion nyob rau hauv cov av noo, acidic, thiab alkaline ib puag ncig. Txawm tias muaj cov tshuaj tiv thaiv -corrosion txheej, kev puas tsuaj hauv cheeb tsam tseem tuaj yeem ua rau xeb. Cov kav dej hlau siv ob txoj kev tiv thaiv kev tiv thaiv- xeb: txheej txheej zinc txau + asphalt txheej thiab cov cement mortar hauv ob sab phlu, txhim khu kev ruaj khov. Cov ntaub ntawv kho dua tshiab hauv nroog ntug dej hiav txwv pom tau tias tom qab hloov pauv, cov kav dej xau tau poob qis ntawm 25% mus rau qis dua 8%.
Mechanical Properties
Cov kav hlau kav hlau, vim yog lub kheej kheej graphite nyob rau hauv, sib txuas lub siab ua haujlwm ntawm cov hlau cam khwb cia nrog lub toughness ntawm hlau. Lawv lub zog tensile tuaj yeem ncav cuag tshaj 420MPa, thiab lawv cov elongation tshaj 10%, deb tshaj cov kav hlau zoo tib yam. Lawv lub qhov (socket) - hom pob qij txha hloov tau tuaj yeem ua tiav lub kaum sab xis deflection, tiv thaiv lub hauv paus kev daws teeb meem thiab cuam tshuam seismic. Cov kav hlau hlau, ntawm qhov tod tes, muaj qhov tsis zoo toughness thiab ua rau tawg tawg nyob rau hauv kev cuam tshuam sab nraud lossis hauv paus kev daws teeb meem. Lawv cov welded rigid pob qij txha tsis adaptability, thiab lawv yooj yim puas thaum lub raj xa dej yog twisted los yog misaligned.
Yooj yim ntawm installation
Cov kav hlau kav hlau feem ntau siv cov khoom sib txuas, tshem tawm qhov xav tau ntawm vuam. Qhov no ua rau kev tsim kho sai thiab yooj yim, tsis tshua muaj kev cuam tshuam los ntawm ib puag ncig, thiab 5-10 npaug sai dua cov kav hlau. Steel yeeb nkab installation yog complex, yuav tsum tau welding, kho cua sov, thiab lwm yam txheej txheem, xav tau ntau yam kev txawj ntse thiab cov cuab yeej siv, thiab ua rau muaj kev pheej hmoo ntawm kev puas tsuaj rau cov txheej txheem los tiv thaiv corrosion thaum lub sij hawm installation.
Cov nqi kho mob
Cov kav hlau kav hlau tsis tshua muaj xeb thiab kev laus, yuav tsum tau saib xyuas tsawg kawg nkaus txhua hnub thiab tsis muaj kev kho lossis hloov ntau zaus. Cov kav hlau hlau, ntawm qhov tod tes, muaj qhov cuam tshuam rau xeb thiab xeb, yuav tsum tau kuaj xyuas tsis tu ncua, tshem tawm xeb, thiab tiv thaiv - kev saib xyuas corrosion, ua rau cov nqi siab dua.
Kev Pabcuam Lub Neej
Kev tsim lub neej ntawm cov kav hlau steel feem ntau yog 20-30 xyoo, thaum cov kav hlau hlau tuaj yeem kav ntev dua 50 xyoo raws li cov qauv kev ua haujlwm. Kev tshawb fawb los ntawm International Water Association (IWA) qhia tau hais tias qhov nruab nrab txhua xyoo kev saib xyuas tus nqi ntawm cov kav hlau kav tsuas yog 1/5 ntawm cov kav dej steel, ua rau pom cov txiaj ntsig tseem ceeb hauv kev lag luam thoob plaws hauv lawv lub neej.
Qhov tseem ceeb ntawm kev hloov cov kav hlau qub nrog cov kav hlau kav hlau
Kev hloov cov kav dej qub nrog cov kav hlau txuas tuaj yeem daws tau cov teeb meem zoo xws li cov xau thiab tawg hauv cov dej hauv nroog, txhim kho kev ruaj ntseg thiab kev nyab xeeb ntawm cov dej, txo cov dej siv hluav taws xob, txuag dej, txo cov nqi tu, txhim kho qib hauv nroog infrastructure, thiab xyuas kom muaj kev loj hlob ntawm cov nroog.
