Recent Works

H. Shimada
Kyushu University

Recently, in order to protect workers' safety during construction, as well as for environmental and cost reasons, efficient small-diameter shallow tunneling methods have become increasingly important in regard to outside plant engineering such as for water, electricity, telecommunications and gas. The effects of the above projects in overcrowded urban areas are significant and often result in substantial impact and traffic delays with associated loss of travel time. Clearly the solution to these utility placement problems, if the full impact of trench excavation is to be avoided, is trenchless technology. In particular, for construction work near existing facilities, an underground tunnel that is excavated by pipe-jacking is frequently used. Pipe-jacking is an often used method for the non-disruptive construction of the underground pipelines of sewage systems. Pipe-jacking, in its traditional form, has occasionally been used for short railways, roads, rivers, and other projects. It involves the pushing or thrusting of a drivage machine through concrete pipes ahead of jacks. It utilizes the mud slurry which is formed around the pipes in order to stabilize the surrounding soil. However, the behavior of the soil and mud slurry around the pipes is not clearly understood.　From these perspectives, this study discusses the use of pipe-jacking which uses mud slurry on the soil.

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