Intersecting Parallels
螺旋形井筒支架 [矿业] Helical Steel Support
矩形井筒 quadrant pit
长方形井筒 rectangular shaft
井筒变形测量杆 [矿业] shaft deformation bar
椭圆形井筒 elliptical shaft
在立井井筒建设中，我们在原设计的基础上，对箱形永久钢井架凿井的实际方法作了改进。
This text introduced the practice method of the box permanent steel petroleum derrick shaft sinking in the construction of vertical shaft pit shaft.
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