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旋挖钻机施工规范中允许桩孔垂直度偏差为1%度,假设为50m的桩长最大允许偏差范围是0.85m左右。目前很多桩机工程验孔设备都已采用超声波检验仪,对桩长、桩径和垂直度检验很精确,如果超出规范范围,将会影响成孔质量和施工进度。1偏孔现象1)急剧偏孔急剧偏孔一般都是由地质造成,由于岩层风化程度,岩石分布不均匀等,下放主卷到孔内某一位置时钻斗突然被卡住,或钻杆突然偏向一侧,说明孔内某一位置突然偏差。
Drilling rig construction specifications allow pile hole verticality deviation of 1%, assuming that the maximum allowable pile length of 50m deviation range is about 0.85m. At present, many pilots engineering hole inspection equipment have been used ultrasonic testing instrument, pile length, pile diameter and verticality test is very accurate, if beyond the scope of the standard, will affect the quality of the hole and the progress of construction. 1) The phenomenon of partial hole 1) The sudden hole hole is usually caused by geology. Due to the weathering degree of the rock formation and uneven distribution of the rock, the drill pipe is suddenly stuck when the main roll is lowered to a certain position in the hole, or the drill pipe Suddenly biased to the side, indicating a sudden deviation of a hole location.