Kaʻa kaʻahoʻokahi apo ma lalo o nā cranesa i ʻole ma lalo o ka crane e holo ana, ʻo ia ke ʻano like o ka crane holo kaʻa ma luna o ke poʻo. Hoʻopili pinepine ʻia nā kaola ala o kahi puʻu alahaka ma lalo a kākoʻo ʻia e ka hale kākoʻo o ka hale, e hoʻopau ana i ka pono o nā kolamu papahele hou e kākoʻo i nā ala. ʻO kēia ala, ʻoi aku ka maikaʻi o kahi crane underhung bridge inā pili ka papahele o ka papahele a me ke koi ʻana e hōʻemi i ka pale ʻana o ka papahele i nā pilikia ma ka papahele hale hana a hale kūʻai paha. He hopena maikaʻi nō paha ka ʻaui ma lalo o ka pahu pahu hoʻokahi no nā hale hana me nā kaupaku sloping a i ʻole nā ʻōnaehana crane lehulehu.
ʻO nā ʻeke hoʻokahi ma lalo o ka pahuHoʻohana maʻamau ʻia no ka mālama ʻana i nā mea māmā, me ka nui o ka ukana o 10 tons a i ʻole. Hoʻolālā ʻia kā mākou mau cranes underslung e hoʻomaikaʻi i ka palekana o ka crane a hōʻemi i ka manawa pōʻaiapili ukana i ka wā hana hana.
Ke kūʻai aku nei nā cranes monorail underhungma nā kumukūʻai crane alahaka nui. ʻO nā puʻe ma lalo o ka pahu kūʻai wela hoʻokahi, ʻo ia ka 1 tons underslung crane, 2 tons underslung crane, 3 tons underslung crane, 5 tons underslung crane, 10 tons underslung crane, a ʻoi aku. Loaʻa nā hoʻolālā crane girder single girder underslung crane e hoʻokō i kāu mau noi kikoʻī a me nā koi hāpai.
ʻO kahoʻokahi apo ma lalo o ka craneʻO ia ka mea māmā e lawelawe ana i ka crane i kau ʻia ma luna o ke kaupaku o ka wahi hana me ka ʻole o nā kolamu papahele, e mālama ana i ka wahi a me ka hōʻemi ʻana i nā kumukūʻai. ʻO nā hiʻohiʻona maʻamau o ka crane girder bridge crane me ka hoʻolālā underslung crane penei:
ʻO ka maikaʻi kūlike, ka hilinaʻi a me ka hana paʻa, me nā mea maikaʻi o ka hoʻolālā bridge crane.
Hoʻohana ke kaʻa hope/hopena i kahi hoʻolālā hoʻolālā maikaʻi.
ʻO ka lāʻau paʻa a i ʻole ka pahu welded structure crane beam e hiki ai i ka hāʻawi ʻana i ka ukana maikaʻi loa.
Hiki ke hoʻohālikelike ʻia ka hoʻolālā crane kaʻina i kāu noi e mālama i nā ukana kokoke i ka pā hale.
ʻO nā cranes monorail ma lalohiki ke hoʻohui ʻia i ka hale hale me ka ʻole o nā kolamu, a laila e hoʻonui ai i ka hoʻohana ʻana i ka honua
ʻO ka hoʻolālā ʻana o ka crane bridge girder māmā māmā me ka nui o ka ukana ma kahi o 10 tons a i ʻole.
