Xov xwm - Vim li cas cov nplooj ntawv steel siv dav?

Raws li cov nroog thoob ntiaj teb kev sib tw los txhim kho cov txheej txheem kev laus thiab tsim cov chaw tshiab hauv nroog,steel ntawv pilestau tshwm sim raws li kev hloov pauv kev ua si - nrog rau lawv cov kev teeb tsa nrawm nrawm dhau los ua tus tsav tsheb tseem ceeb ntawm kev saws me nyuam, pab cov neeg cog lus txiav cov sijhawm ncua sij hawm thaum lub sijhawm tsim kho hauv nroog nruj.

Cov ntaub ntawv kev lag luam los ntawm Lub Koom Haum Ntiaj Teb Kev Siv Hlau (GSCA) qhia txog 22% xyoo dhau ib xyoo nce hauvnplooj ntawv pawgKev siv rau hauv nroog tej yaam num nyob rau hauv 2024, spanning subway expansions, waterfront redevelopment, thiab sib sib zog nqus excavation ua hauj lwm rau high-rise foundations. Tsis zoo li cov qauv kev tuav pov hwm ib txwm siv uas yuav tsum muaj lub lis piam kho lub sijhawm,niaj hnub steel ntawv pawg-feem ntau prefabricated kom tau raws li qhov project tshwj xeeb qhov ntev - tuaj yeem tsav mus rau hauv av ntawm tus nqi ntawm 15 mus rau 20 linear meters ib hnub twg, txiav lub sijhawm tsim kho ntawm qhov chaw los ntawm 30% ntawm qhov nruab nrab.

Maria Hernandez, tus kws tshaj lij kev tsim kho vaj tse nyob hauv Madrid-raws li kev tsim kho lub tuam txhab EuroBuild hais tias "Kev tsim hauv nroog tsis tos- ncua ntev txhais tau tias tus nqi siab dua thiab muaj kev cuam tshuam ntau dua rau cov neeg nyob hauv nroog," "Ntawm peb qhov project metro ncua ntev hauv Barcelona, hloov mus rau kev sib tshuamkub dov steel ntawv pawgrau qhov tunneling phab ntsa shaved 12 hnub tawm ntawm lub excavation theem. Qhov ntawd yog qhov tseem ceeb thaum koj ua haujlwm hauv cov zej zog tuab uas muaj kev nkag mus tau tsawg. "

Qhov kev thov rov hais dua ntawmua pilesextends tshaj ceev. Lawv cov txheej txheem corrosion-resistant (xws li kub-dip galvanization lossis polymer kev kho mob) ua rau lawv ruaj khov rau kev siv lub sijhawm ntev, thaum lawv cov qauv tsim tso cai rau kev tshem tawm yooj yim thiab rov siv dua hauv cov haujlwm yav tom ntej - ua raws li lub hom phiaj kev noj qab haus huv hauv nroog. Hauv Singapore's Marina Bay qhov kev hloov kho ntawm ntug dej hiav txwv, piv txwv li, daim ntawv pawg tau teeb tsa hauv 2023 kom ruaj khov av yuav raug muab rov qab rau qhov project tiv thaiv ntug hiav txwv ze rau xyoo 2025, txo cov khoom pov tseg los ntawm 40%.

Cov neeg npaj lub nroog tseem ceeb toom txog cov txiaj ntsig rau kev khiav tsheb thiab kev nkag mus rau pej xeem. Hauv Toronto, txoj kev nthuav dav hauv peb lub hlis dhau los tau siv cov ntaub ntawv los tsim cov phab ntsa tuav ib ntus raws thaj chaw ua haujlwm. "Vim tias kev teeb tsa tau ua tiav hauv peb hmo xwb, peb zam tag nrho txoj kev kaw thaum lub sijhawm siab tshaj plaws-ib yam dab tsi uas yuav ua tsis tau nrog cov phab ntsa pob zeb," said Toronto Transportation Department tus cev lus James Liu.

Cov neeg tsim khoom tau teb rau qhov kev thov loj hlob los ntawm kev tsim kho tshiab ntxiv. Nyuam qhuav pib lub hlis no, Dutch steel tsim ArcelorMittal tau tshaj tawm ib daim ntawv sib tw tshiab sib txawv uas tuav lub zog siab tab sis yog 15% yooj yim rau kev thauj thiab teeb tsa, tsom mus rau nruab nrab qhov loj hauv nroog cov phiaj xwm uas siv cov tshuab hnyav yog txwv.

Cov kws tshaj lij kev lag luam kwv yees tus qauv yuav nrawm dua hauv 2025, nrog rau daim ntawv cog lus yuav tsum loj hlob ntxiv 18% raws li cov nroog hauv Asia thiab Africa txhawb nqa kev nqis peev hauv vaj tse. "Kev lag luam hauv nroog tsis qeeb, thiab cov neeg cog lus xav tau cov kev daws teeb meem uas sib npaug ceev, kev nyab xeeb, thiab kev ruaj ntseg," said GSCA tus kws tshuaj ntsuam xyuas vaj tse, Raj Patel. "Cov kab ntawv txheeb xyuas tag nrho cov thawv no-thiab lawv lub luag haujlwm hauv kev tsim kho hauv nroog loj tsuas yog yuav loj dua."