M'zaka zapitazi, kugwiritsa ntchito ma cran okwera kwambiri padziko lonse lapansi kunali kosowa.Chifukwa chake chinali ntchito zomwe zimafuna kukwezedwa pamwamba pa matani 1,500 zinali zochepa.Nkhani yomwe ili mu February ya American Cranes & Transport Magazine (ACT) ikuwunika kuchuluka kwa kugwiritsidwa ntchito kwa makina akuluakuluwa lero, kuphatikizapo kuyankhulana ndi oimira omwe makampani awo amawapanga.

Zitsanzo zoyambirira

Ma cranes oyamba adalowa pamsika pakati pa kumapeto kwa zaka za m'ma 1970 mpaka koyambirira kwa 1990s.Ophatikizidwa anali Versa-Lift yolemba Deep South Crane & Rigging ndi Transi-Lift yolemba Lampson International.Masiku ano pali mitundu makumi awiri ya crane yomwe imatha kukweza matani pakati pa 1,500 ndi 7,500, ndipo ambiri amatera mumtundu wa matani 2,500 mpaka 5,000.

Liebherr

Jim Jatho, woyang'anira zinthu za Liebherr ku US ku lattice boom crawler crane akuti ma crane akuluakulu akhala ofunikira kwambiri m'malo opangira mafuta komanso ntchito zina zazikulu zamabwalo.Liebherr's mega crane yotchuka kwambiri ku United States ndi LR 11000 yokhala ndi matani 1,000.LR 11350 yokhala ndi matani 1,350 ili ndi mphamvu padziko lonse lapansi yokhala ndi mitundu yopitilira 50 yogwiritsidwa ntchito kosatha, makamaka ku Central Europe.LR 13000 yokhala ndi mphamvu ya matani 3,000 ikugwiritsidwa ntchito m'malo asanu ndi limodzi popanga mphamvu zanyukiliya.

Lampson International

Wochokera ku Kennewick, Washington, Lampson's Transi-Lift mega crane yomwe idayambika mu 1978 ndipo ikupitiliza kupanga chidwi lero.Mitundu ya LTL-2600 ndi LTL-3000 yokhala ndi mphamvu zokweza matani 2,600 ndi 3,000 yakumana ndi kufunikira kogwiritsidwa ntchito pama projekiti a zomangamanga komanso malo opangira magetsi, bwalo lamasewera, ndi zomangamanga zatsopano.Mtundu uliwonse wa Transi-Lift umakhala ndi phazi laling'ono komanso kuwongolera kwapadera.

Tadano

Mega cranes sanali gawo la mbiri ya Tadano mpaka 2020 pomwe kupeza kwawo kwa Demag kudamalizidwa.Tsopano kampaniyo imapanga mitundu iwiri pamalo awo fakitale ku Germany.Tadano CC88.3200-1 (yomwe kale inali Demag CC-8800-TWIN) ili ndi mphamvu yokweza matani 3,200, ndipo Tadano CC88.1600.1 (yomwe kale inali Demag CC-1600) ili ndi mphamvu yokweza matani 1,600.Zonsezi zimagwiritsidwa ntchito m'malo padziko lonse lapansi.Ntchito yaposachedwa ku Las Vegas idayitanitsa CC88.3200-1 kuti ipange mphete ya matani 170 pamwamba pa nsanja yachitsulo yamtsogolo ya MSG Sphere.Ikamalizidwa mu 2023, bwaloli likhala ndi owonera 17,500.