It is the core power source for driving the pipe jacking process. Its powerful thrust ensures that the pipeline can successfully traverse various complex geological layers. During the jacking operation, the main jacking cylinder not only provides stable pushing force but also precisely controls the extension and retraction speed of the cylinder, enabling smooth and accurate pipe jacking. Additionally, the main jacking cylinder features high pressure resistance and excellent sealing properties, allowing it to work continuously under harsh conditions, ensuring the efficient and safe execution of the pipe jacking construction.
In pipe jacking operations, the hydraulic main thrust cylinder is the primary actuator of the jacking system, converting hydraulic pressure into the high axial loads needed to advance pipes through soil or rock. It delivers consistent and controllable jacking force—often in the range of hundreds to thousands of kilonewtons—by extending its piston rod against a thrust ring that transfers the load evenly around the pipe circumference. Mounted within the launch shaft’s jacking frame, these hydraulic cylinders push directly on the pipe string (or TBM shield), reacting against a reinforced thrust wall to ensure secure and precise forward movement. Their robust design and synchronized operation are essential for maintaining alignment, minimizing frictional resistance, and enabling continuous, long-distance pipe jacking without ground settlement or pipe misalignment.
