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在大口径桩基工程中,常常在同一工地上遇到几种不同直径的桩基,这就要求施工者同时准备几种相应直径的钻头。对于一些小工程(桩数不超过20根),施工结束后,钻头尚未达到报废的程度,而在下一个工程中又不一定适用。有时为少加工一个钻头,甚至出现以大代小,人为地扩大钻孔直径,造成材料的极大浪费。而且,用常规的钻头施工钻孔,一般都是事前做成定型的,中途很难根据地层的变化而重新设计制作,往往造成钻头的形状与地层性质不适应,影响成孔效率,同时准备各种规格和各种类型的钻头,其耗资之大,并不是每一个施工队伍所能接受的。为解决这些问题,笔者通过施工实践设计
In large diameter pile foundations, several pile diameters of different diameters are often encountered on the same site, requiring the builder to prepare several drills of the corresponding diameter at the same time. For some minor works (no more than 20 piles), the drill bit has not yet reached the end of construction after the construction is completed, and may not be suitable for the next project. Sometimes for the processing of a drill less, and even appeared to small, artificially expand the hole diameter, resulting in a great waste of materials. Moreover, using conventional drill bit construction drilling, are generally made in advance stereotypes, the middle is difficult to re-design changes made according to the formation, often resulting in bit shape and formation properties do not adapt to affect the hole forming efficiency, while preparing each Species and various types of drill bit, the cost of large, not every construction team can accept. To solve these problems, the author through the construction practice design