Why Develop Trenchless Directional Drilling Technology?

Trenchless technology first appeared and developed in Britain, America and Japan. Now, it has become a new environmental protection construction technology in the world, with a rapid development momentum. The annual increase in equipment and the market expansion speed are more than 30%. The trenchless construction market has been a rapidly growing market.

Due to geological conditions, environmental impact and physical characteristics, the water supply pipeline will face scaling, corrosion, leakage and other problems after a period of use. The drainage pipeline will encounter pipeline dislocation, deterioration, tree root invasion, deformation or fragmentation, leakage, drainage capacity decline, rainwater infiltration and other conditions. At this time, we need to repair the pipeline in time to prevent it from "working with disease". "In 2011, the total length of water supply networks in all provinces, cities and autonomous regions in China was 283041 kilometers (more than 75 mm). Among them, gray cast iron pipes accounted for 19%, asbestos and cement pipes accounted for 7%, pipes with unknown conditions accounted for 17%, and plastic pipes accounted for 5%. A total of about 48% need to be upgraded." Replacement, repair or life extension are the three ways of pipeline renewal and transformation. The specific methods are as follows: cast iron pipes are subject to flexible treatment and flushing to extend their service life; Cement pipes and cast iron pipes are restored by lining repair; The more thorough solution is to replace the pipeline. These methods can be selected through technical economy and full cycle comprehensive analysis. However, no matter which scheme is selected, it will "involve the introduction of advanced construction technology".

The production, application and development of any applied technology are based on actual needs. Market demand is the driving force for the production, development and application of modern technology. Moreover, the criteria for evaluating the level and importance of a technology are mainly the success (economic and social benefits) and innovation degree of the technology in application.