Lub qhov rooj hluav taws kub hnyiab yog cov khoom sib txuas ntawm lub qhov rooj thiab lub qhov rooj, uas feem ntau txhawb nqa lub qhov rooj thiab muaj qee yam kev tiv thaiv tub sab nyiag. Lub qhov rooj tua hluav taws yog dov nrog steel phaj, thiab nws cov npoo kaw yuav tsum tau welded.