[Construction Example] Avoiding Obstacles with Vertical Curves (Arc Advancement)

The construction period associated with the shaft can be shortened, and costs for the structures of both shafts or piping, etc., can be reduced.

We would like to introduce a construction case of avoiding obstacles using the "arc propulsion" vertical curve, requested from Ishikawa Prefecture. This construction was planned as a river crossing project. To cross the river, the bank sheet piles posed an obstacle, so it was planned with "steep slope start → vertical curve → steep slope reach" to ensure the separation of the pipeline. 【Project Overview】 ■ Project Name: Seismic Reinforcement Project for Prefectural Water Supply Pipeline - Pipeline Burial Work (Kanazawa-1-53) ■ Location: Akatsuchi-cho to Kannon-do-cho, Kanazawa City, Ishikawa Prefecture ■ Method: Ultimate mud-water pressure propulsion method ■ Propulsion Pipe Diameter: Ф1350mm Hume pipe (Main pipe Ф900mm DIP-NS) ■ Propulsion Length: L=259m (Vertical/R550m, R380m Horizontal/R2000m) ■ Cover Depth: 3.9m to 16.8m ■ Soil Conditions: Sandy silt to clay to sandy silt ■ Pipeline Gradient: Start -11.3° Reach +16.8° *For more details, please feel free to contact us.

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