Overview of the method
It can be used for long distances while protecting the structure of communication and power landing pipes, water supply pipes, seawater intake pipes, offshore wind power high voltage cable pipes, etc. It is the only construction method that is optimal for fishing grounds, coral reef nature conservation areas, and places where damage to pipes and cables by waves is a concern.
| Plane Distance | 292.76m |
| Drilling Distance | 300.25m |
| Drilling diameter | 311.20mm (Pilot drilling 12-1/4″) 406.40mm (Expanding drilling 16″) |
| Target soil type | Ryukyu limestone |
| Mains use | 4″ tubing VAMFJLP110 Outer diameter 101.6mm Inner diameter 90.12mm |
Characteristics of the Earth Shuttle
①The only method that can propel a small diameter tube over a very long distance (over 1000m)
※Since it varies depending on the geology, surveys and designs are required for each construction project.
②High-speed construction (reduced construction time and costs)
⇒ No need for starting/arrival shafts, auxiliary construction methods, or excessive temporary structures
③Suitable for almost all geology
⇒ Easy bit replacement and can handle hard rock up to 300MN/m
④Deep track construction possible
⇒ Obstacles are avoided using vertical curves
⇒ If an artificial magnetic field can be created, horizontal curves are also possible.
⑤All processes are carried out on the ground, ensuring safe construction.
⇒ Avoiding underground disasters that are difficult to predict
⑥Greatly reduces the risk of cable damage
⇒ There is a risk of cables being damaged or cut due to natural disasters near the coast.
Reduces damage and disconnection problems over the long term and ensures soundness