The dedicated slurry discharge pipe for shield tunneling machines is the core pressure bearing component of the slurry/soil pressure balance shield tunneling machine circulation system. It is designed specifically for transporting high concentration solid-liquid mixture slurry during tunnel construction. It is responsible for transporting the excavated waste soil, sand and gravel, and slurry mixture from the cutterhead to the ground slurry treatment system. It also has pressure buffering and anti blocking diversion functions, ensuring efficient and continuous excavation, solving the pain points of traditional pipeline wear resistance, poor anti blocking, and unstable pressure, and adapting to the long-distance excavation needs of multiple geological conditions such as hard rock, sand, and silt.

Composite reinforcement structure: The mainstream is a three-layer composite of "wear-resistant lining+pressure bearing skeleton+anti-corrosion outer layer" - the inner layer is UHMWPE or silicon carbide ceramic wear-resistant layer, which resists particle erosion; Middle layer high-strength steel wire mesh/seamless steel pipe skeleton, providing bi-directional pressure support; Outer epoxy resin/polyurethane anti-corrosion layer, suitable for high humidity and corrosive environments in tunnels. The flexible section adopts steel wire reinforced rubber tube body to meet the deformation requirements of shield tunnel attitude adjustment.

Key component adaptation: straight pipe matching with large curvature elbows with a curvature radius ≥ 3 times the pipe diameter to reduce drag; A detachable grille plate is installed at the branch to filter large particles; Integrated pressure sensor interface for high-pressure section to prevent blowouts; Adopting quick installation flange/snap joint, suitable for rapid disassembly and extension of tunnels.

• POE composite modification, ultra-high wear resistance and erosion resistance

  Kangyu has developed a POE toughened and wear-resistant formula that can withstand high-speed erosion of shield mud and sand and gravel particles. Its wear resistance is more than 10 times that of ordinary HDPE pipes;

• Strong and impact-resistant, resistant to the impact of shield coarse aggregates

  Elongation at break ≥800%, resistant to stone impact, high-pressure mud pulse impact, no brittle cracking in low temperature environment;

• Ultra-low friction on the inner wall, anti-scaling and anti-clogging

  The inner wall roughness is ≤0.006mm, the mud fluidity is good, and it is not easy to hang on the wall and accumulate, ensuring that the shield can continue to discharge slurry smoothly;

• Resistant to acid and alkali corrosion, suitable for complex shield mud media

  Resistant to long-term corrosion by mud, groundwater, acid-base soil, and chemical grouting media, the POE wear-resistant layer will not age or peel;

• Resist environmental stress cracking and adapt to underground deformation of pipe jacking

  Environmental stress cracking resistance ESCR ≥ 12000h, adaptable to underground soil settlement, pipe jacking extrusion stress, and geological displacement;

• Balanced rigidity and toughness, suitable for trenchless pipe jacking construction

  The pipe is both strong and tough, resistant to pressure and extrusion, and can be directly used for pipe jacking and shield tunnel slurry laying;

• Integrated flanged pipe connection, high-pressure slurry discharge with zero leakage

  The pipe interface is connected by Kangyu's unique integrated pipe flanging clamp, which is stronger than the pipe body and can withstand the impact of high-pressure mud from shield tunnels, eliminating pollution caused by slurry leakage;

• Light weight and high efficiency in shield pipe jacking construction

  The dead weight is much lower than that of steel pipes and cast stone pipes, making it easy to transport and install underground and in tunnels, and is suitable for narrow shield tunneling operating spaces;

• Anti-aging and weather-resistant, long-term stable operation underground

  Resistant to underground moisture, microbial erosion, long-term soil aging, and suitable for permanent slurry pipelines in tunnels and comprehensive pipe corridors;

• Super long service life, reducing the overall cost of shield engineering

  Kangyu provides slurry pipe recycling services, which eliminates the need for maintenance during use and significantly reduces project operation and maintenance investment.