collar tie beam圈梁
collar r beam roof系梁屋顶
collar-beam roof[建] 系梁屋顶
Collar beam mounting系梁设置
collar beam roof系梁屋顶;系梁屋面
supporting collar beam支承圈梁
front t collar beam前箍梁
front collar beam前箍梁
collar beam roof truss系梁人字木屋架