Kajima Corporation

Besst, Inc.

Masaru Toida

Toshiyuki Tanaka

Makoto Nakajima

Noah R Heller

Ichizo Kobayashi

Takeshi Sasakura

Takahisa Isobe

Hiroyoki Atsumi

Toru Chino

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

Systems and methods for installation and operation of a groundwater monitoring system in a borehole of any angle using a coaxial gas displacement pump with a unique O-ring assembly that serves as a two-position valve for groundwater purging and sampling and also as a housing and sealing mechanism for isolating an optical pressure sensor. The optical sensor measures in-situ hydraulic pressure directly subjacent and adjacent to the surrounding rock fractures and sediment pores without hydraulic interferences from potentiometric equilibration lag time from recovery fluid pressure inside a borehole, in a zone above the optical sensor, or on the inside of a riser pipe that rises to the ground surface.

Systems and methods for installation, design and operation of groundwater monitoring systems in boreholes

Growing community of inventors

Tokyo, Japan

Masaru Toida