Lub culvert corrugated board ntau lawm kab yog ib yam khoom tshwj xeeb rau culvert corrugated board compression molding, uas yog dav siv nyob rau hauv kev tsim kho kev lag luam thiab lwm yam chaw, xws li railway choj tunnels, txoj kev loj choj tunnels thiab lwm yam.