No-dig laying pipelines technique in gravel

The oriented hole construction technique is key in no dig engineering,it decides the success or defeated of no dig engineering.The operations were conducted for drilling through the busyness road,which has many various pipes underground in Changsha,and laying pipelines in no dig technique.In this paper,we discuss the working procedure in no dig engineering in complex area.Meanwhile,we extend the drilling hole and shaping micro tunnel in stabilization,the new idea that is the application of micro tunnel in no dig may be expanding.