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一台瑞典Atlas Boomerh104全液压凿岩台车,在投入施工的初期就发生钎尾、钻杆频繁断裂的情况,平均打130多个孔（累计进尺约400 m）就断1根钎尾或钻杆（钎尾或钻杆的断裂一般是交替发生的）,远远低于其设计使用寿命。 从钻杆与钎尾的断裂部位来看,属于螺纹的疲劳断裂,即因螺纹（与连接套拧紧的一侧）损坏而导致钻杆或钎尾的断裂（见附图）。台车在钻进过程中,连接套、钻杆、钎尾相互的结合部位会产生大量的热量,若用手触摸它们不能超过3s,甚至使连接套在结合部位出现发蓝的情况,这表明其局部温度已达到了400℃以上。并且在钎尾和钻杆的端面上出现了比较严重的气蚀麻坑。
A Sweden Atlas Boomerh104 fully hydraulic rock drilling rig occurred in the initial stage of putting into operation with frequent broken drill rods. An average of more than 130 holes (cumulative footage of about 400 m) were cut off by 1 shank or drill Rods (shank or drill rod breakage are usually alternately occur), far below its design life. From the fracture point of drill pipe and shank, the fatigue fracture which belongs to the thread, that is to say the fracture of the drill rod or shank due to the damage of the thread (the side to be tightened with the connecting sleeve) (see attached figure). Trolley during drilling, connecting sleeve, drill pipe, brazing tail joint will produce a lot of heat, if you touch them can not exceed 3s, or even make the connection sleeve in the blue parts of the situation, indicating that The local temperature has reached above 400 ℃. And in the end of the drill shank and drill pipe appeared more serious cavitation pit.