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...
Kev sib sau ua ke corrugated culvert yeeb nkab yog ua los ntawm ob peb daim ntawm corrugated daim hlau tsau nrog bolts thiab ceev, nrog nyias daim hlau, lub teeb yuag, yooj yim thauj thiab khaws cia, txheej txheem kev tsim kho yooj yim, yooj yim rau nruab rau ntawm qhov chaw, daws qhov teeb meem ntawm destructio ...