Chidule Chathunthu cha Kireni Yoyambitsa Bridge Girder

Kumanga milatho ndi ntchito yovuta komanso yovuta yomwe imafuna kugwiritsa ntchito zida ndi machitidwe apamwamba. Mbali yofunika kwambiri pakupanga milatho ndi kukhazikitsa milatho, yomwe ndi gawo lofunika kwambiri lothandizira padenga la mlatho. Kuti zitheke kumanga bwino komanso motetezeka mipanda ya mlatho, ma crane okweza mipanda ya mlatho amagwiritsidwa ntchito. Ma crane awa ndi gawo lofunikira kwambiri pamakina amakono omanga milatho ndipo amachita gawo lofunikira pakumaliza bwino ntchito za milatho.

Ma crane okweza ma brad girder amapangidwa mwapadera kuti azitha kunyamula ndi kuyika ma brad girder olemera pamalo awo. Ma crane amenewa ali ndi zinthu zapadera zomwe zimawathandiza kuchita mayendedwe oyenera komanso olamulidwa ofunikira pomanga brad. Ma crane oyambitsidwa nthawi zambiri amaikidwa pa zothandizira zakanthawi pa dambo la mlatho kapena pafupi ndi dambolo, zomwe zimathandiza kuti azisunthidwa kutalika kwa mlatho panthawi yomanga.

Chimodzi mwa ubwino waukulu wogwiritsa ntchito crane yokweza mlatho ndi kuthekera kwake kopangitsa kuti ntchito yomanga ikhale yosavuta. Pogwiritsa ntchito zida zapaderazi, ogwira ntchito yomanga amatha kunyamula bwino ma girders a mlatho ndikuyika pamalo awo, zomwe zimachepetsa nthawi ndi ntchito zofunika poyika ma girders. Kuphatikiza apo, kugwiritsa ntchito crane yoyambira kumawonjezera chitetezo pochepetsa zoopsa zomwe zingachitike chifukwa chogwiritsa ntchito ma girders olemera pamanja.

Pali mitundu yosiyanasiyana ya ma crane okweza ma brad girder, iliyonse yopangidwa kuti ikwaniritse zofunikira za polojekiti. Ma crane ena amapangidwira milatho yowongoka, pomwe ena amatha kugwira mapangidwe a milatho yokhotakhota kapena yogawika. Kusinthasintha kwa ma crane awa kumapangitsa kuti akhale oyenera ntchito zosiyanasiyana zomanga milatho.

Mwachidule, crane ya mlatho ndi gawo lofunika kwambiri pa njira yamakono yomangira mlatho. Kutha kwawo kunyamula ndi kuyika matabwa olemera molondola komanso moyenera kumawapangitsa kukhala ofunikira kwambiri pakumaliza bwino ntchito za mlatho. Pamene ukadaulo ukupitirira kupita patsogolo, akuyembekezeka kuti crane zapamwamba komanso zaukadaulo zidzapangidwa kuti ziwonjezere luso la zida zomangira mlatho.