Kajima Corporation

Takeshi Sasakura

Toshiyuki Tanaka

Makoto Nakajima

Ichizo Kobayashi

Masaru Toida

Takahisa Isobe

Ichizou Kobayashi

Katsuhiro Uemoto

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

When making moisture content adjustment by adding liquid such as water to a raw material such as pulverulent material including bentonite, uniform mixing of the liquid such as water with the raw material is given with relatively simple facilities, moisture content adjustment of a large quantity of raw materials is attainable, and besides, a material having satisfactory performances such as impermeability is obtainable through uniform moisture content adjustment. Within a mixing tank () configured with a normal powder mixer kept at low temperatures, pulverulent bentonite (A) and fine granular ice (B) are stirred and mixed. Stirring and mixing of the fellow pulverulent materials are adapted to uniformly mix the pulverulent bentonite (A) and the fine granular ice (B), enabling uniformly moisture content-adjusted bentonite to be obtained. A liquid-nitrogen gas bomb (), for instance, is connected to the mixing tank (), causing the inside of the mixing tank to be kept at low temperatures with nitrogen gas supplied from the bomb, before putting the prepared fine granular ice (B) through an inlet port ().

Material moisture content adjustment method

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Tokyo, Japan

Takeshi Sasakura