A raise catwalk is made up along the side of the "chest" . 沿着“箱”一侧设一道不宽的天井升降梯道。
Open raise implies that building work is limited to the raise catwalk and the basis of a simple platform on which drilling personnel stand . 开放式天井，是指那些开挖过程中只需设置天井升降梯道及供钻工站立的简单基础平台的天井。
Riley ) wow . - ( ben ) look at the elevators 哇-看那些升降梯
Riley ) wow . - ( ben ) look at the elevators 哇-看那些升降梯
