Kajima Corporation

Takahisa Isobe

Hiroshi Yoshida

Toshiyuki Tanaka

Taro Ikeda

Makoto Nakajima

Ichizo Kobayashi

Kenji Nishi

Teruo Yahiro

Takeshi Sasakura

Masaru Toida

Hidenobu Hamano

Yoichi Kume

The present invention provides a spray method and spray apparatus for bentonite-based material that allow forming a bentonite layer of high dry density. A spray apparatuscomprises a supersonic nozzle, to which a compressorand a bentonite containerare connected. The supersonic nozzleis fed compressed air from the compressorand a bentonite-based material from the bentonite container. The compressed air, mixed with the bentonite-based material, is accelerated to supersonic speed when passing through a constriction portionof the supersonic nozzle, and is sprayed at supersonic speed out of a jet orifice

Method of spray application, and spray apparatus, for bentonite material

Method and apparatus for crushing the earth under the ground by boring a hole; inserting a drill head having radially directed water jet thereon down the hole to the desired stratum; rotatingly moving the drill head upwardly while jetting water radially to form a cylindrical crushed area; lowering the drill head to the original depth; extending a water jet extender arm radially to a projecting position; again rotatingly moving the drill head upwardly while jetting water from the nozzles on the radial outward portions of the extender arm to radially enlarge the cylindrical crushed area, the rotation of the extender arm also stirring the already crushed area; returning the extender arm to an original waiting position; and lifting the drill head out of the hole.

Method of and apparatus for crushing earth under the ground

Growing community of inventors

Tokyo, Japan

Takahisa Isobe