Ua ntej, tus nqi muab los ntawm tus muag khoom tus nqi yog dab tsi Tus nqi ntawm galvanized steel grating yuav xam los ntawm tuj, kuj yuav xam raws li square, thaum tus neeg muas zaub xav tau ntau npaum li cas, tus neeg muag khoom nyiam siv lub tuj raws li chav tsev ntawm tus nqi, ...
Larsen steel ntawv pawg yog dab tsi? Nyob rau hauv 1902, ib tug German engineer hu ua Larsen thawj zaug tsim ib hom steel ntawv pawg nrog U zoo li tus ntoo khaub lig-section thiab locks ntawm ob hnub, uas tau ua tiav nyob rau hauv engineering, thiab hu ua "Larsen Sheet Pile" tom qab nws lub npe. Tam sim no...