Principle of Optical Cable Pipe Jacking Machine

An optical cable pipe jacking machine works by hydraulically pushing pipes through the ground while excavating soil at the front, ensuring precise alignment for underground cable installation.Working PrincipleThe pipe jacking machine operates as a trenchless construction method to install protective conduits for optical cables underground with minimal surface disruption. The process begins in a launch pit, where the machine is positioned and aligned toward a reception pit. The machine advances by hydraulic jacks that push the pipes forward incrementally, while a cutting head at the front excavates soil to allow smooth pipe movement .Key ComponentsJacking Frame: Provides the thrust necessary to push the pipes through the soil. Multiple hydraulic jacks are interconnected to ensure uniform force distribution .Cutting Head: Excavates soil at the tunnel face. Depending on ground conditions, it may include rotating cutters, screw conveyors, or slurry systems to remove excavated material efficiently .Shield: Encases the machine and protects both the equipment and workers from soil collapse during excavation. It also helps maintain alignment and stability .Guidance System: Ensures the machine follows the pre-designed path. Modern systems use laser targets, inclinometers, and CCD cameras to monitor the machine's position and correct deviations in real time .Operational PrincipleThe cutting head excavates soil at the tunnel face, which is transported away via augers, conveyors, or slurry pipelines.Hydraulic jacks push the pipe segments forward, using the previously installed pipe as a reaction against the thrust.Alignment and steering are continuously monitored using electronic guidance systems or laser-based methods to maintain the correct line and level, which is critical for long-distance or curved installations .Lubrication (e.g., bentonite slurry) is often applied to reduce friction between the pipe and surrounding soil, facilitating smoother jacking and minimizing pipe stress .ApplicationsOptical cable pipe jacking machines are widely used in urban areas, under roads, railways, rivers, and other obstacles where open trenching is impractical. The installed pipes act as protective casings for optical cables, ensuring durability and safety from environmental or mechanical damage . In summary, the principle of an optical cable pipe jacking machine combines controlled excavation, hydraulic jacking, shield protection, and precise guidance to install underground conduits efficiently and safely.