| Horizontal Directional Drilling (HDD), which is one of the most potential method among Four Trenchless Methods as it has high precise orientation, has good performance especially in extreme areas where there are many complicated pipelines. Because the development in Trenchless is more late than developed countries, the relevant technology is straggling. Nowadays, research in rock directional drilling is a hotspot and also a difficult point in trenchless field, and it would has a great influence to our nation economic development and foundation construction. Therefore, this paper mainly study the construction technic in rock directional drilling, including pilot profile design, pilot drilling, enlarge hole, pullback loads calculation and bore-meal cleaning. Meanwhile, researching findings are properly used in fact.1. This paper has made an overall and systematic research, and the results have been properly used in pipeline construction. Besides, many different researching findings from oversees have been consulted to consummate a better effect.2. This paper has made an integrate construction course for rock directional drilling. And each process of project construction has been given a sufficient and aborative analysis. So it can guide trenchless construction in rocks.3. During the Bore-meal Cleaning theorietics research, some Numerical Models and theoretics equations were applied to ensure have a direct viewing result. And the research results used in construction proved that reverse circulation has some better characteristics than normal circulation, such as high efficiency, reliability and practicality.
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