n.托梁

The floor joist was cracked and fractured, but no debris was deposited in the basement. 地板托梁破裂折断，但是在地下室并未落下碎片。

The purpose of transferring loads to the joist and wiping out the columns can be achieved safely. 通过预应力吊杆将楼面荷载转移到托梁上，安全地实现托梁拔柱的目的。