Kev Siv Bailey Frame

Covbaileythav duab yog siv los txuas thawj kab rau kab thib ob ntawm txoj hlua. Ob chav kab ib txheej choj, nrogibthav duab tau teeb tsa kab rov tav hauv nruab nrab ntawm lub ntsej muag sab saum toj ntawm txhua lub truss (lossis txhawb nqa). Nyob rau hauv rooj plaub ntawm ob kab thiab ob chav lawj, ntxiv rau athav duabteeb tsa rau saum npoo av, athav duabyuav tsum tau teeb tsa rau tom qab kawg txoj kab ntsug ntawm lub truss sab saud (athav duabkuj tseem yuav tsum tau teeb tsa rau ntawm lub hauv ntej kawg kab ntsug ntawm thawj ntu ntawm truss). Thaum tus choj peb-kab, txoj haujlwm thiab tus lej ntawm tus ncej yuav zoo ib yam li ntawm tus choj ob kab. Rau kev teeb tsa, plaub lub tsho hollow ntawm txhua qhov kawg tau muab tso rau hauvthav duabqhov ntawm ob kab ntawm truss thiab tom qab tsau nrog cov thav duab thav duab.