Pipe jacking has driven underground in segments from a starting shaft using hydraulic jacks. Therefore, this method is an inherently safer and there is no dangerousness about collapse of working place. This method can be used to any variety of conditions such as soft soil, area to higher groundwater level, curved section and driven to long distance without extra method. Therefore, it has advantage to reduce the construction period. It is easy to lay pipe conduit across under the railways, road, and expressway, etc. In addition, this is environment-friendly method because it will not give damage to ground structure with no collapse by ground disturbance while operation.

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