I. Technical Overview
Sewer pulling pipe technology is a trenchless pipe construction technology based on horizontal directional drilling (HDD). It uses a ground-based guidance system to precisely control the drill head trajectory, achieving trenchless laying of underground pipelines. This technology is widely used in municipal drainage, sewage pipe network renovation, crossing obstacles, etc., and has significant advantages such as short construction cycle, low cost, and minimal impact on the ground environment.

II. Technical Principles and Core Advantages
(I) Technical Principles
Pilot hole drilling: Using a drill bit with guidance function, the drill bit's position, inclination angle, and other parameters are monitored in real-time through a ground receiver to precisely control the drilling direction and bypass underground obstacles.
Stepwise reaming: Multi-stage reaming bits are used to gradually expand the hole diameter to 1.3-1.5 times the outer diameter of the pipe, ensuring smooth mud circulation and stable hole walls.
Pipe pulling back: The prefabricated pipe is pulled back through the reamed hole to the design position to complete the laying.
(II) Core Advantages
High efficiency and environmental protection: Compared with traditional excavation methods, construction efficiency is increased by 40%-60%, the overall cost is reduced by about 30%, and the impact on ground traffic and the environment is reduced.
Strong adaptability: It can cross complex geological conditions such as railways, highways, rivers, and buildings, with a minimum soil cover thickness of only 1.5 times the pipe diameter.
Material innovation: HDPE solid-wall pulling pipes have a tensile strength ≥25MPa, ring stiffness ≥12.5kN/m², strong corrosion resistance, and a service life of more than 50 years.
III. Technological Innovation and Development Trends
(I) Intelligent Monitoring System
The "smart pulling pipe", which integrates fiber optic sensing technology, can monitor pipe stress, leakage, and other parameters in real time, with a warning accuracy of 95%, providing a guarantee for safe pipe operation.

(II) Composite Material Application
Steel-strip reinforced polyethylene corrugated pipe (SN16 grade) increases ring stiffness by 40% while maintaining flexibility, suitable for deep burial and high-pressure scenarios.

(III) Miniaturized Equipment
Portable pulling machines weigh ≤3 tons, can be used in narrow lanes, have a minimum turning radius of 30 meters, and meet the needs of complex terrain.
IV. Conclusion
Sewer pulling pipe technology, as an important technological means of modern municipal construction, is developing towards intelligence and greenness. In the future, with the integrated application of 5G+Beidou positioning technology, construction accuracy will be further improved; the research and development of bio-based biodegradable materials is expected to solve the problem of the hundred-year degradation of traditional HDPE pipe materials. This technology will play a greater role in urban renewal, sponge city construction, and other fields, providing strong support for sustainable urban development.

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