Masami Shiotsubo

Title: Masami Shiotsubo and Underground Pipe-Laying Innovations.

Introduction

Masami Shiotsubo is an inventor associated with Hiratsuka, Japan, whose work focuses on methods and equipment for installing pipelines underground. Her listed inventions address excavation, slurry handling, and propulsion during pipe laying. Shiotsubo is credited with 2 patents.

Latest Patents

Propulsion Pipe Laying System. This invention describes a propulsion-jack-driven system that advances a pilot head fitted with a cutter into the ground. Water is supplied to a receiving chamber, where excavated earth and sand are mixed into slurry and discharged through a pipe. The described embodiments regulate slurry flow using either a flowmeter or differential-pressure detection, with a valve controlling the discharge.

Pipe Laying Method and Apparatus. This method begins by installing a small-diameter pilot pipeline between departure and arrival pits. A cutter head attached to the pilot pipeline excavates soil, which is mixed with water and discharged as slurry to a tank in the arrival pit. A propulsion jack advances the cutter head, and the pipe being installed is connected behind it. Repeating the excavation and propulsion steps enables installation of a larger-diameter pipeline.

Career Highlights

Shiotsubo’s listed patent work centers on coordinated excavation and slurry removal for underground construction. The inventions describe ways to manage soil and advance pipe-laying equipment through the ground.

Collaborations

Shiotsubo is associated with Kabushiki Kaisha Komatsu Seisakusho. Listed coworkers include Hiroshi Saito and Toshikazu Yamamuro.

Conclusion

Masami Shiotsubo’s two listed patents describe practical approaches to underground pipeline installation, combining propulsion, excavation, and slurry management.