Kabushiki Kaisha Komatsu Seisakusho

Joji Nakamura

Hiroaki Tamaki

Shigetake Akanuma

Kihachior Furumi

Kihachiro Furumi

Method of building underground cavern and tunneling machine

A method and apparatus for driving a hollow pile into the ground. By using a hollow rod having a short auger fixedly secured to a leading end portion thereof, excavated earth and sand are lifted to and around the upper portion of the auger where compressed air is spouted from nozzle orifices formed in the hollow rod thereby lifting the excavated earth and sand through the hollow pile and consequently discharging the same from the hollow pile. As earth and sand are discharged from the hollow pile, the pile is sunk or driven into the ground.

Method of driving hollow piles into the ground

Method and apparatus for driving hollow piles into the ground

Method and apparatus for fracturing rock beds

A method and an apparatus for excavating a tunnel, hole, channel or the like in the rock mass or in the ground by using pressurized water spouted from nozzles. The method comprises the steps of digging a hole in the rock mass, inserting a rod of a fracturing apparatus in the hole, the rod having a communicating hole formed therein and nozzles formed at the leading end thereof, jetting pressurized water from the nozzles so as to produce grooves in the hole impinged by the water jet, sealing a space around the nozzles defined by the outer periphery of the rod and an inner peripheral wall of the hole, and again allowing pressurized water to spout from the nozzles into the space thereby forming cracks in the rock mass.

Method and apparatus for excavation

Growing community of inventors

Kamakura, Japan

Joji Nakamura