The some techniques of guideshaft and expansion excavation are improved for assure the successful construction and raise the safety coefficient.
为保证施工顺利进行，且提高安全性，对正反导井及扩挖系统进行了多项技术改进，提高了安全系数。
2
The upper scroll, the upper guideshaft, the lower guideshaft and the lower scroll are sequentially connected through the canvas in a transmission way;
上卷轴、上导轴、下 导轴、下卷轴依次通过画布传动连接；
3
The optical base and the feed screw or the guideshaft are held in contact with sliding members made of a resin or a ceramic and having a heat conductivity.