In the recent ten years, directional drilling/ guided boring technology being used to lay different kinds of underground pipelines has been greatly applied.

The technique of underground pipeline laying with guided/directional drilling is technologically intensive and eco-friendly.

2 Mine used small-diameter pilot drilling,then gradually reaming the borehole and finally completed to designed size.

Study of automation system of no-dig guided boring track;

In this article,authors introduce the technique principle of trenchless laying pipe by guided boring.

The paper has introduced principle and drilling method of guided boring trenchless technology,and analysed applied examples and effects of this technology in Fengcheng City of Jiangxi Province,and showing that technology is an effective method of pipeline installation in underground pipeline engineering.

This paper discussed the non-digging directional drilling and laying technique with a pipeline engineering crossing the South Fei River as example.

Combined with engineering case study,introduced non-excavating piping in complicated strata,considered that directional drilling in complicated strata should change drilling bit on time according to strata,and adjust flush fluid as well.

In allusion to issues of large diameter,bit balling plugging,rather slow penetration rate and poor wearing resistant cutting teeth in directional drilling non-excavation pipe laying construction,analyzed reamer configuration and to improve the reamer from 4 aspects of pilot bit,bit nozzle,bit wing and cutting tooth.