The reason why hdd ditch witch transition subs tools are being applied and paid more and more attention is not only its inherent technical advantages, but also the great desire brought by social development, which is mainly manifested in the following aspects: underground crossing is an inevitable requirement of social development.

Whether the planning of various sectors is not in place, the coordination is not good, or the need for infrastructure development, the new underground facilities are always increasing, then either excavation or non-excavation, it is inevitable to choose one.

As the advantages of trenchless are gradually recognized by people, hdd ditch witch transition subs tools are becoming more and more mature, and trenchless construction costs are decreasing year by year, so the application of trenchless is increasing year by year.

Underground pipeline is an important part of urban infrastructure, cable pipe, water pipe network, thermal (power) pipeline and underground railway together, known as the lifeline of the city, with the development of society, the length of underground pipeline continues to increase, on the other hand, China's per capita pipeline is much lower than the western developed countries, The reason why hdd ditch witch transition subs tools are being applied and paid more and more attention is not only its inherent technical advantages, but also the great desire brought by social development. The main performance is as follows:

(1) Underground crossing is an inevitable requirement of social development. Whether the planning of various sectors is not in place, the coordination is not good, or the need for infrastructure development, the new underground facilities are always increasing, then either excavation or non-excavation, it is inevitable to choose one. As the advantages of trenchless are gradually recognized by people, hdd ditch witch transition subs tools are becoming more and more mature, and trenchless construction costs are decreasing year by year, so the application of trenchless is increasing year by year. Underground pipeline is an important part of urban infrastructure, cable pipe, water pipe network, heat (power) pipeline together with the underground railway, known as the lifeline of the city, with the development of society, the length of underground pipeline continues to increase, there is a huge growth of the trenchless market.

(2) After the construction of Bridges, buildings and tunnels in trenchless cities with advantages in areas without excavation conditions, it is impossible to excavate and lay pipelines. Although some have surface excavation conditions, because the pipeline is buried too deep and the groundwater level is high, non-excavation becomes the method. The application field of horizontal directional/directional drilling technology is environmental treatment engineering. Pollutants such as some large garbage disposal sites, industrial waste sites, aircraft fuel depots at airports and air force bases, underground fuel storage, oil refineries, gas stations, etc. seep underground under the action of rainwater, contaminating groundwater and soil. Horizontal Wells are drilled in the contaminated area using horizontal directional/guided drilling techniques, and filters are installed inside them to extract contaminated groundwater and prevent further spread of contaminants. In addition, the following treatment methods can also be used: air injection and soil gasification extraction; Recovery of free products (light or heavy non-soluble liquids); Biological treatment (injection of media to speed up the breakdown of contaminants); Extractive leaching and chemical stabilization; Soil layer monitoring and sampling. The ground road network is criss-crossing, the underground facilities are staggered, and the functional division of urban blocks has become an insurmountable obstacle for conventional engineering construction. There is a strong demand for hdd ditch witch transition subs tools. Obstacles that may be crossed in municipal construction include: existing underground municipal pipe network, subway network, highway network, underground space and underground facilities, buildings, rivers, cultural relics protection sites, etc. The traditional construction method is almost impossible to complete, and the trenchless method is duty-bound.

(3) Trenchless has competitive advantages such as environmental protection and livability. If the amount of excavation in a city exceeds a certain proportion, it will inevitably affect the traffic and the normal life of citizens. The non-excavation construction does not hinder traffic, does not pollute the environment, does not destroy vegetation, does not affect the surrounding buildings, does not affect all the normal life and work order of residents.

(4) In some projects, non-excavation has comparative advantages. When trenchless construction increases with the depth, the cost increase is not too much, and it can also cross rivers, lakes, railways, highways, urban buildings, etc. by the shortest reasonable path, with high construction efficiency, saving material consumption and reducing construction costs. Therefore, non-excavation has comparative advantages in some projects.

(4) In some projects, non-excavation has comparative advantages. When trenchless construction increases with the depth, the cost increase is not too much, and it can also cross rivers, lakes, railways, highways, urban buildings, etc. by the shortest reasonable path, with high construction efficiency, saving material consumption and reducing construction costs. Therefore, non-excavation has comparative advantages in some projects.

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