Joji Ejiri

Title: Innovations in Underground Structure Protection by Joji Ejiri

Introduction

Joji Ejiri, an accomplished inventor based in Tokyo, Japan, has made significant contributions in the field of civil engineering. With a total of two patents to his name, he has focused on innovative methods to enhance the safety and durability of underground structures in areas susceptible to ground liquefaction.

Latest Patents

Ejiri's latest patents delve into the methods of protecting structures built on unstable ground. The first patent outlines a method where a conglomerate layer is formed horizontally on a base of ground that possesses high water permeability and is prone to liquefaction. A bottom plate is constructed on this conglomerate layer to support the underground structure. Additionally, one or more drainpipes extend upwardly from the conglomerate layer through the bottom plate to effectively drain excessive pore water present in the ground.

The second patent expands upon this concept, detailing a method for safeguarding a structure that is built on ground likely to be liquefied. In this approach, a conglomerate layer is created in groundwater with similar high permeability. The underground base of the structure is constructed upon this layer, while one or more drainpipes are extended horizontally from the conglomerate layer through the base, allowing communication with the surface for efficient drainage.

Career Highlights

Throughout his career, Joji Ejiri has held positions at notable firms including Ohbayashi Corporation and Chubu Electric Power Company, Inc. His work has not only advanced the field of foundation engineering but has also improved the resilience of infrastructure in seismic-prone areas.

Collaborations

Ejiri has had the privilege of collaborating with esteemed colleagues in his field, such as Tadao Sugimoto and Shigeki Tsuchiyama. Their combined expertise has fostered a collaborative environment that encourages innovation and the sharing of knowledge in the domain of civil engineering.

Conclusion

Through his innovative patents and collaborations, Joji Ejiri has established himself as a noteworthy inventor in the realm of structural engineering. His methods for protecting underground structures contribute significantly to the safety and longevity of infrastructure in regions vulnerable to ground instability.