论文部分内容阅读
在桩端持力层中钻进时,需考虑由于钻斗的吸引现象使桩端持力层松弛,因此上提钻斗时应缓慢。如果桩端持力层倾斜时,为防止钻斗倾斜,应稍加压钻进。稳定液的配合比按地基土的状况、钻机和工程条件来定一般8kg膨润土可掺以100 L的水。对于黏性土层,膨润土含量可降低至3%～5%。由于情况各异,对稳定液的性质不能一概而定,表11列出可供参考的指标。
When drilling in the pile holding layer, it is necessary to consider slackening of the holding layer of the pile due to the attraction of the drilling bucket, so it should be slow when lifting the drilling bucket. If the pile bearing tilting layer, in order to prevent the bucket tilting, should be a bit pressure drilling. Stabilizing fluid with the ratio of the foundation soil conditions, drilling rigs and engineering conditions to be generally 8kg bentonite can be mixed with 100 L of water. For clay, bentonite content can be reduced to 3% to 5%. Due to different conditions, the nature of the stabilizer can not be generalized, Table 11 lists the indicators for reference.