The reason why hdd reamers for vermeer wholesale has been more and more application and attention, both its inherent technical advantages, but also the huge desire brought by social development, mainly in: 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 reamers for vermeer wholesale is becoming more mature, and the cost of trenchless construction is decreasing year by year, so the application of trenchless is growing year by year. Underground pipeline is an important part of urban infrastructure, cable pipe, water pipe network, heat (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 possession is far lower than Western developed countries, according to the data in 1998, The per capita possession of tap water and sewer in our country is only 0.18m/ and 0.hdd reamers for vermeer wholesale has been more and more application and attention, both its inherent technical advantages, but also the great thirst for social development, mainly manifested in:

(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 reamers for vermeer wholesale is becoming more mature, and the cost of trenchless construction is decreasing year by year, so the application of trenchless is growing year by year. Underground pipeline is an important part of urban infrastructure, cable pipe, water pipe network, heat (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 possession is far lower than Western developed countries, according to the data in 1998, The per capita occupancy of tap water and sewer in China is only 0.18m/ person and 0.lm/person, while the European region has a per capita upper and sewer is 12m/ person, which is 66.6 times and 120 times of the per capita value in China, respectively, and the trenchless market has a huge growth space. During the 11th Five-Year Plan period, there were about 2,400 key infrastructure projects in Beijing, requiring an investment of about 470 billion yuan. The central city has built more than 700 kilometers of sewage pipe network, and plans to transform 200 kilometers of rain and sewage combined pipe network and 500 kilometers of water supply pipe network. According to the planning of the Beijing Urban Construction Planning Institute, the future underground space development of Beijing will focus on shallow and sub-shallow underground space, that is, the space below the ground minus 30 meters or more. Subways, underground squares, underground streets, municipal tunnels (common trenches), large underground gas storage facilities, underground rainwater storage facilities, underground garbage stations, underground garages, underground substations and other forms will be built. The construction of communication facilities and functional facilities requires the support of hdd reamers for vermeer wholesale. 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 network is vertical and horizontal, underground facilities are staggered, and the functional division of urban blocks has become an insurmountable obstacle to conventional engineering construction, and there is a strong demand for hdd reamers for vermeer wholesale. 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. Beijing's rail network has 114 kilometers of track, and its highway network has 548 kilometers of urban expressways, which will reach 900 kilometers by 2010. The existing urban fast road network has a skeleton length of 4,073 kilometers, and by 2010, the total length of highways in Beijing will reach 16,000 kilometers. Beijing municipal pipeline network has a total length of more than 13 thousand kilometers of various urban municipal pipelines. In 2004, the total construction area of underground space in the city was 274.4 billion m2, with an average annual increase of about 30 billion m2. These can become obstacles to new construction.

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