套管护壁解决松散层钻进难题

本文介绍一种新的钻探松散地层护壁方法－套管护壁“三板斧”。本方法与书本上所述的套管护壁跟管钻进方法有反向思维操作概念。并以本县农行十六层办公大厦场地地层中部松散砂卵石层钻探为例，分别阐述套管护壁（击入小管作导向、大管套小管、拔出小管留大管）三道工序操作要点及其使用效果。

Casing pipe wall protection solving the problem of looes strata driling

This paper introduces a new wall protection method for drilling loose strata casing pipe wall protection. This is a reversal thinking operation concept against the pipe drilling method of casing pipe wall protection described in conventional books. The drilling work of loose strata with sand and gravel in the middle part of the ground of 16 storey building for Yangshan County Agricultural Bank is taken as an example to describe the main points of three step operation (driving small pipe as a guide, driving big pipe to encase the small one and then pulling the small pipe out from the big one) and results of this casing pipe wall protection.