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.
为满足液压轮式通井机的使用要求而设计的桅杆式井架采用板焊结构，主体截面为长方形的方形钢，材料为HG60。
The frame of mast derrick that is designed for hydraulic wheel tractor hoist adopt welding of armor plate, its section is oblong armor plate, and its material is HG60.
本发明涉及一种高强度结构钢在石油钻机井架设计制造中的应用。
The invention relates to the application of a high-strength structure steel in the design and manufacturing of the derrick of a petroleum drilling machine.
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