Under normal circumstances, different trenchless technologies should be adopted according to different pipe diameters for the construction technology to be adopted in pipe laying.
2.5 For the application of rammed pipe method, the trenchless construction technology of rammed pipe method is applied, which is generally used in construction projects with short distance.
For example, pneumatic spear method, pipe ramming method or horizontal guided drilling method are used for small diameter pipes; For pipelines with large diameter, shield method, pipe jacking method or tunnel construction method shall be applied.
3.
For such trenchless construction, the construction process it applies is a “pneumatic method” or “fixed pipe splitting process”.
Trenchless overview: In 1900, the United States adopted pipe jacking method to successfully realize trenchless pipeline laying technology.
During the repair of old pipes, some new pipes can be sleeved on the old pipes.
If the construction length is less than 150m and the pipe diameter is less than 1500mm, which reflects the low construction cost, the trenchless construction technology is commonly used for construction.
Non excavation refers to the new construction technology of laying, replacing and repairing various underground pipelines under the condition of excavating a small part of the surface (generally referring to small area excavation at the entrance and exit) by using various geotechnical drilling equipment and technical means through guiding and directional drilling.
At present, the world’s trenchless technology and equipment are mature, and different construction processes can be adopted for different geological conditions and environments.
Therefore, it is necessary to optimize and select the municipal pipeline construction methods, especially the municipal pipeline construction carried out in the busy urban sections or during the peak hours of people’s travel, and pay special attention to the construction methods.
Because the municipal pipeline construction project is relatively complex and has many influencing factors, it is necessary to conduct necessary research on the construction environment that the underground pipeline can cope with.
2.3 The application of micro tunnel method in municipal pipeline construction, the non excavation construction technology is commonly used for the construction of sewers.
2.2 The application of tube bursting (cracking) method is also called tube expanding method.
In general, this trenchless construction method is commonly used in the construction of many water supply and drainage projects.
Fixing Socket Cross Pin Nail Plate
In 1970, the United States took the lead in using the “horizontal steering drilling method” to lay the first pipeline using this technology across the river.
The application of trenchless construction technology in municipal pipeline construction In the process of municipal pipeline construction, the trenchless construction technology to be applied is mainly reflected in the laying or repair of pipelines, as well as the replacement of old pipelines.
It also increases the carrying load of urban roads, and makes the construction of municipal pipelines continue to have some technical problems.
The implementation of necessary investigation is to formulate safe and reliable construction measures according to the information obtained from the investigation..
If the construction of old pipeline repair is to be carried out, the trenchless technology that needs to be applied generally includes sliding interpolation method or in-situ solidification method.
Since the mid-1990s, trenchless technology has entered the Chinese market, and has grown rapidly at the rate of 40% per year.
However, when applying this construction technology, it is necessary to investigate the soil environment of the construction section, because this trenchless construction technology cannot be applied in sandy or loose soil sections.
If the trenchless construction technology can be applied, these problems can be solved to a large extent.
Of course, no matter which trenchless technology is applied, it has its characteristics or advantages to promote the effective improvement of municipal pipeline construction efficiency.
With China entering the stage of social and economic construction and development in a new era, the process of urbanization has been accelerating.
According to the construction technology, the pipe jacking construction technology can be divided into earth pressure balance type, air pressure balance type, mud water balance type or hand driven type.
Because it is relatively convenient to construct underground pipelines of such length or diameter.
This brings heavy tasks to the construction of urban municipal pipelines, and makes the urban underground pipelines present a complex trend.
In 2005, trenchless technology began to be used in various cities in China, and it was successively used to cross the Yangtze River, Yellow River and other important rivers.
The application of this trenchless technology generally requires the construction of sewer pipes or pressure pipes and the repair of these old pipes.
1.
The advantage of pipe jacking construction technology is that it is applicable to any soil environment, has relatively low requirements for the construction environment, and can highlight the construction effect.
In 1980, with the continuous maturity of trenchless technology, people invented the “pipe expansion method” (pipe blasting method) for different pipe network conditions, and this technology was gradually introduced later.
Pipe jacking construction technology is a non excavation construction method developed from the shield construction technology.
In the traditional pipeline construction mode, the excavation method is generally used for the repair or laying of water supply and drainage pipelines.
Because the application of this trenchless construction technology can reflect certain simplicity, especially in the rock geological environment, the application of this trenchless construction technology has its unique application advantages.
This technology can adapt to the high water content in the soil or the loose soil, which shows the poor quality Ρ Chinese people’s standards τ The construction technology of forced excavation at the site of Coal Returning to Qian Nunnery can not only reflect the convenience of construction, but also reflect the effective control of construction quality and ensure the safety of construction.
At the same time, in the construction process of some pressure pipes, pipe jacking method is sometimes used as a non excavation construction technology.
2.4 Application of pipe jacking method The trenchless construction technology of pipe jacking method is generally used in relatively large sewer construction projects.
2.1 The application of horizontal directional drilling method is generally applicable to pipelines with a single construction length of about 2500 meters and a pipe diameter of about 1200 mm.
Key points of measures for application of trenchless construction technology in municipal pipeline construction In the process of municipal pipeline construction, it is particularly important to do a good job of necessary research before specific construction.
