Hlau yeeb nkab tshuab los ntawm lub npe yuav to taub tias nws yog lub luag hauj lwm ntawm txoj hlua hlau steel, yeeb nkab yeeb nkab yog ntau heev nyob rau hauv kev tsim kho, siv lub tsev siv los ntawm ib txoj hlua txuas ntawm steel, vim yog lub perennial sab nraum, huab cua rau ib lub sij hawm ntev, kev yooj yim rau xim xim xeb. Cov yeeb nkab hlau ntxig deformation tseem heev heev, tsis tom qab kho cov xim xim tsis tau siv dua qub, uas kuj tau ua haujlwm zoo los xauj cov lag luam scaffolding.
Ob peb cov yeeb nkab yuav raug kho ncaj, ntau npaum li cas ntawm cov kev ceev kho yog powerless, yog li peb lub tuam txhab tau qhib lub tshuab tshwj xeeb rau kev sib haum ntawm cov yeeb nkab, cov yeeb nkab ncaj yog ib qho ntawm nws cov dej num ntau hauv cov tshuab steel straightening tau hloov los ntawm xeb, xim ib kauj ruam tiav, ib feeb ua tiav 2 6 meter hlau yeeb nkab, qhov ua tiav ntawm tes tsis tuaj yeem muab piv, tsis muaj nyiaj khib nyiab rau nws yog ib qho yooj yim ua haujlwm.