Yangzhou Dilong YD1500 Slurry-Type Rock Pipe Jacking Machine has been successfully deployed for the Yeosu Project in South Korea and put into operation. Tailored to the complex geological conditions of overseas projects, the machine steadily carries out jacking operations and completes phased construction tasks. With its outstanding hard rock tunnelling performance and unique Slurry-Type construction technology, it fully demonstrates the innovative strength and global competitiveness of China-made pipe jacking equipment.
The Yeosu pipe jacking project in South Korea features distinctive geological conditions and poses great construction challenges. The tunnelling section passes through typical upper-soft-and-lower-hard mixed strata. The upper silty soil layer is soft and vulnerable to disturbance, imposing stringent requirements on settlement control and tunnelling stability. The lower stratum consists of high-strength hard rock with an uniaxial compressive strength up to 100 MPa, which brings great difficulties in rock breaking and generates heavy jacking resistance. It constitutes a rigorous test for the machine’s rock cutting capacity, stratum adaptability and overall construction performance. Conventional pipe jacking equipment can hardly satisfy the construction requirements for alternating soft and hard strata.
To tackle the complex mixed strata of upper soft soil and lower hard rock at the project site, our self-developed and self-manufactured YD1500 Slurry-Type Rock Pipe Jacking Machine delivers exclusive technical advantages. As China’s first Slurry-Type hard rock pipe jacking machine, it is equipped with a dedicated Slurry-Type circulation system and a high-strength hard rock cutterhead, enabling precise tunnelling in alternating strata of upper silty soil and underlying ultra-hard rock. The machine can effectively minimise disturbance to soft soil strata and prevent construction risks such as settlement and cavity collapse. Meanwhile, it is capable of steadily breaking hard rock up to 100 MPa, overcoming the industry challenge caused by dramatic property differences between soft and hard layers. Stable jacking attitude and controllable construction accuracy are guaranteed throughout the tunnelling process.
During construction, the YD1500 Slurry-Type Rock Pipe Jacking Machine exhibited remarkable stratum adaptability and perfectly suited the complicated geological environment of the Yeosu Project. Tunnelling transition between soft and hard strata proceeded smoothly and efficiently. With stable operation and excellent construction quality, the machine advanced all jacking procedures in line with high standards and successfully completed the pipe jacking works in mixed strata, highlighting the unique technical merits of the Slurry-Type hard rock pipe jacking machine.
The successful implementation of the Yeosu Project not only fulfils the challenging pipe jacking works in mixed strata, but also lifts the technical benchmark for domestic pipe jacking equipment as China’s first Slurry-Type hard rock pipe jacking machine. The successful overseas application further verifies the robust tunnelling capacity of our Slurry-Type hard rock pipe jacking equipment in ultra-high-strength rock and upper-soft-lower-hard mixed strata. It lays a solid foundation for high-end Chinese pipe jacking machinery to explore the global infrastructure market, and offers an innovative and reliable equipment solution for pipe jacking projects in complex mixed strata worldwide.