The2 girder pamwamba cranendi njira yonyamula katundu wolemetsa yomwe imagwiritsidwa ntchito m'mafakitale omwe amafunikira kuwongolera zinthu zolimba, zapamwamba kwambiri. Kireni yamtunduwu imakhala ndi zomangira ziwiri zofananira m'lifupi mwa malo ogwirira ntchito, zomwe zimapereka kukhazikika komanso kunyamula katundu kuposa ma cranes amtundu umodzi. Ma cranes apamwambawa ndi abwino kwa ntchito monga kupanga zitsulo, kusonkhanitsa magalimoto, kupanga zombo, ndi malo ena ofunikira kwambiri komwe kulondola komanso kulimba ndikofunikira.
Poganizira njira zonyamulira zolemetsa, kumvetsetsapawiri girdereti mtengo wa cranendizofunikira pakukonza bajeti yama projekiti akuluakulu amakampani.
Kapangidwe ka a2 girder pamwamba cranenthawi zambiri zimaphatikizapo:
Magulu Awiri: Zomangamanga ziwiri zoyambirira zomwe zimanyamula katundu, zomwe zimapatsa crane mphamvu yayikulu yonyamulira zida zolemetsa.
Magalimoto Omaliza: Opezeka kumapeto kwa magirders, awa amathandizira kuyenda motsatira njira ya Double girder eot crane, zomwe zimathandiza kuyenda mopingasa kudutsa malo ogwirira ntchito.
Hoist ndi Trolley: Imayikidwa pakati pa zomangira ziwirizo, chokweza ndi trolley zimayenda mozungulira ma girders, ndikupangitsa kuyenda molunjika komanso kopingasa.
Electric Motor ndi Control System: Thedouble girder eot cranekusuntha, kukweza, ndi ntchito zina zimayendetsedwa kudzera pa mota yamagetsi, nthawi zambiri ndi chiwongolero chakutali kapena wailesi kuti igwire bwino ntchito.
Thepawiri girdereti mtengo wa cranezingasiyane mosiyanasiyana kutengera zomwe mukufuna, monga kuchuluka kwa katundu, kutalika, ndi zosankha zomwe mwasankha.
Kusamalira nthawi zonse zigawo za crane-monga hoist, control systems, ndi structural framework-ndizofunikira pakugwira ntchito kotetezeka komanso koyenera. Madongosolo okonza akuyenera kuphatikizira kuwunika kwa injini, mabuleki, ndi zida zonyamula katundu kuti zitsimikizire kudalirika ndikupewa kuwonongeka kosayembekezereka.
