Thaum nws los txog rau cov kav dej, muaj ntau ntau yam khoom siv los xaiv. Ob qho ntawm feem ntau yog High Density Polyethylene (HDPE) thiab hlau. Ob leeg cov ntaub ntawv muaj lawv tus kheej qhov zoo thiab qhov tsis zoo, thiab qhov kev txiav txim siab ntawm qhov twg siv yuav nyob ntawm qhov kev xav tau tshwj xeeb thiab cov kev xav tau ntawm qhov project.
HDPE yog ib qho yooj yim thiab lub teeb yuag thermoplastic polymer uas feem ntau siv rau cov kav dej thiab roj. Ib qho txiaj ntsig tseem ceeb ntawm HDPE kav yog lawv qhov siab tiv thaiv corrosion thiab tshuaj tua kab mob, ua rau lawv tsim nyog siv rau hauv qhov chaw hnyav. Tsis tas li ntawd, cov kav dej HDPE yog qhov ruaj khov thiab muaj lub neej ntev, feem ntau kav ntev txog 50 xyoo lossis ntau dua.
Cov kav hlau hlau, ntawm qhov tod tes, yog tsim los ntawm ntau yam alloys thiab hlau thiab feem ntau yog siv rau cov ntawv thov siab thiab hauv cov cheeb tsam uas yuav tsum tau muaj zog thiab rigidity. Ib qho ntawm cov txiaj ntsig tseem ceeb ntawm cov kav hlau steel yog lawv qhov tshwj xeeb lub zog thiab ua haujlwm ntev, ua rau lawv zoo tagnrho rau kev siv nyob rau hauv ib puag ncig hnyav uas hnyav hnyav lossis huab cua kub tuaj yeem tshwm sim.
Thaum xav txog qhov sib txawv ntawm HDPE thiab steel kav, nws yog ib qho tseem ceeb kom nco ntsoov tias txhua yam khoom muaj nws tus kheej zoo thiab qhov tsis zoo. Thaum HDPE hloov tau yooj yim dua thiab lub teeb yuag, nws yuav tsis muaj zog lossis ruaj khov li hlau. Ntawm qhov tod tes, thaum cov kav hlau steel muaj zog thiab ruaj khov dua, lawv tuaj yeem kim dua thiab yuav xav tau kev saib xyuas ntau dua li lawv lub neej.
Thaum kawg, kev txiav txim siab ntawm cov khoom siv twg yuav nyob ntawm qhov kev xav tau tshwj xeeb thiab cov kev xav tau ntawm qhov project ntawm tes. Txawm hais tias txhua yam khoom muaj nws tus kheej qhov zoo thiab qhov tsis zoo, nrog rau kev teeb tsa thiab kev saib xyuas kom zoo, ob qho tib si HDPE thiab steel kav tuaj yeem muab kev ntseeg siab, kev ua haujlwm ntev ntev rau ntau yam kev siv sib txawv.
