Ob lub-nqaj gantry crane cov tsiaj qus yog weld-ua ke nrog tsis muaj cov leeg pob qij txha, nrog qib siab ntawm ntsug thiab kab rov tav. Lub tshuab trolley yog hluav taws xob tau hluav taws xob, ob-nqaj gantry crane tuaj yeem nruab nrog lifting ntim, uas haum rau kev siv sib txawv.
Lub peev xwm nqa ntawm ob-nqaj gantry crane tuaj yeem siv ntau pua ntawm cov chaw qhib, cov khoom siv rau kev tsim khoom, kev sib tw ua haujlwm rau cov chaw thau khoom thiab thau khoom thauj. Muab ob npaug rau nqaj gantry crane yog dav siv nyob rau hauv cov dej num hnyav heev nqa.
Ob qho nqaj gantry crane yog lub teeb thiab portable, siv ob txhais ceg los tuav choj, kev nplua, thiab nqa. Nyob rau hauv sab saum toj-oc-girder gantry cranes yuav tso cai rau cov ntau dua cov siab ntawm kev txhawb nqa vim tias lub hoist tau raug tshem tawm hauv qab nqaj. Lawv tsis tas yuav tsum muaj cov ntaub ntawv ntxiv rau choj ci thiab cov pa tso pa, yog li kev txhawb nqa ob sab ceg yuav tsum tau saib xyuas ntxiv. Ob chav nqaj gantry crane kuj tseem xav txog qhov twg tsis suav nrog kev xaiv cov nqaj hlau uas tsis tuaj yeem muab tso rau hauv kab teeb thiab txhua tus tuaj yeem siv hauv qab tus choj-crowning system.
Muab ob npaug rau-girder cranes feem ntau yuav tsum muaj kev tshem tawm ntau dua saum toj kawg nkaus ntawm lub nkoj-theem siab, raws li lub hoist trolley caij dav hlau nqaj ntawm lub crane. Cov qauv theem pib ntawm ob lub nqaj gantry crane yog tias ob lub log taug kev ntawm ob txhais ceg, thiab lub hors trolley tshem tawm cov booms thiab mus hla tus girders.