Isingeniso somkhiqizo
I-Bailey Bridge Rock: isetshenziselwa ukulawula isiqondiso se-truss push out futhi ithwale isisindo sebhuloho. I-semi-crescent shim iron ihlelwe ngaphansi kwayo, okulula ukusekelwa phezu kwe-axle yesihlalo sebhuloho. Itshe lingashwibeka liye phezulu naphansi ngokukhululeka. Kunamarola amancane ama-4 nhlangothi zombili. Lapho uphusha futhi udonsa ububanzi bebhuloho, i-chord engezansi ye-truss ihlale ilawulwa phakathi nedwala ukuze kuqinisekiswe isiqondiso sokuphusha nokudonsa ububanzi bebhuloho. I-Rock and roll kufanele imiswe ezinhlangothini zombili ze-strait. Itshe linesisindo esingamakhilogremu angu-102 futhi umthamo omkhulu wokuthwala umthwalo ngu-250 kN.
Isicelo
Umthamo oqondile wesayithi ehlanganisiwe akufanele ube mkhulu kuno-3%, futhi umthambeka ovundlile kufanele ube ovundlile cishe. Setha i-roller endaweni yerola elilinganisiwe, futhi ithreyi yesampula kufanele ibekwe ngaphansi. Itshe ngalinye livumela umugqa owodwa kuphela we-trusses ukuthi udlule. Lapho kumiswa ibhuloho eliwumugqa owodwa, kumiswa ama-rocker amabili ebhange ngalinye; lapho kumiswa amabhuloho anemigqa emibili nantathu, kumiswa amarokhethi amane ogwini ngalunye. Uma uphusha imigqa emithathu yamabhuloho, ukuze ugweme ukuvimbela ukudlula okushelelayo komugqa wangaphandle wama-trusses, ama-roller angaphandle ngaphansi komugqa ophakathi kufanele asuswe. Ibanga phakathi kwedwala nepuleti lokusekela licishe libe ngu-1.0 m, futhi okungenani lingabi ngaphansi kuka-0.75 m. Ipuleti lesihlalo libekwe endaweni ye-axis yepuleti lesihlalo. Njengoba idekhi yebhuloho iphakeme ngo-79 cm kunendawo engaphansi yepuleti lesihlalo, indawo yepuleti lesihlalo kufanele simbiwe kahle ukuze kuncishiswe ukuphakama kwedekhi yebhuloho. Ngokuvamile, umehluko wokuphakama phakathi kwedekhi yebhuloho nomgwaqo akufanele udlule u-30 cm.
