Shenzhen Shenjiang Railroad SJSG-3 Tunnel Project

Large red banner with Chinese characters and design, partially covering a large cylindrical structure with Chinese characters and patterns, likely a promotional display or advertisement.

Φ 11.85m CRCHI EPB TBM

Project Year: 2024

Technical drawing of a mechanical component with dimensions, angles, and annotations, including a cross-sectional view with structural details outlined in white, red, pink, and green lines and text.

Entrance Seal Design

Project Summary

Project Overview:

  • Shenjiang Railway SJSG-3 segment: 12.451 km, including shield tunneling and mining construction.

  • "Leading Pilot" shield machine's first section: 4566.4 meters.

Launch Seal Design:

  • Composed of rubber curtains and foldable pressure plates for effective sealing.

  • Critical for smooth tunnel initiation, especially in complex, water-rich strata.

  • Consequences of Seal Failure:

    • Risk of water and sand inflows.

    • Potential outcomes: surface collapse, traffic disruption, building damage, shield machine burial, and personal safety hazards.

    • Major social and economic impacts, leading to severe financial losses.

Jello-Mud Result

  • Stable pressure is established at the tunnel entrance.

  • During the sequential opening and closing of the reserved holes in the portal, Jello-Mud is fully extruded without any gas or liquid leakage.

  • When the ball valve at the observation port of the backfill grouting hole is opened, Jello-Mud is extruded without any gas or liquid leakage.

  • Jello-Mud exhibited void-filling, sealing, and water proofing capabilities

  • Contractor was able to save on costs compared to using high-cost tail-seal grease to seal the entrance ring

  • For more information on how Jello-Mud assisted in lubrication and settlement control in this project, please contact us for more details.

Diagram showing a waterproofing system with reinforced area, sealing box with Jello-Mud, and no water leakage, on a layer labeled +3, +2, +1, and -1.

Illustration of Jello-Mud sealing the TBM entrance ring

Close-up of a curved metal structure with bolts and a reflective surface showing streaks of water or oil.

Site photo indicating no Jello-Mud was stuck on the shield body, a good indicator of its lubrication capability.