In the 21st century, with the recession in the telecommunications market, the demand for HDD Machine has been greatly reduced, but with the prosperity of the energy industry and the proliferation of broadband services, the demand for horizontal directional drilling rigs has stabilized;
In the renovation of municipal pipelines, the proportion of trenchless construction methods is about 54.1%, and 25% of pipeline laying;
Among various trenchless construction methods, the in-situ curing method is the most popular method, accounting for 51%; followed by the local repair method (40%) and the spray method (31%); the chemical grouting method 28%, Horizontal directional drilling method 24%, blast tube method 22% and branch pipe lining method 21%; cannula method 16%, folding method 14%, ramming tube 9%; micro tunneling method and the like are used in relatively low proportion.
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