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CPC
E21D9/0678

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EFIXED CONSTRUCTIONS E21Mining E21DSHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS E21D9/00Tunnels or galleries, with or without linings Methods or apparatus for making thereof Layout of tunnels or galleries

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E21D9/0678Adding additives

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Patents Grantslast 30 patents

Information Patent Grant
Mechanical tunneling apparatus and process for tunnel in quicksand...
- Patent number 11,976,558
- Issue date May 7, 2024
- Shandong University
- Ke Wu
- E21 - EARTH DRILLING MINING
Information Patent Grant
Hydrogel biocement systems and methods
- Patent number 10,794,029
- Issue date Oct 6, 2020
- Arizona Board of Regents on behalf of Arizona State University
- Ximin He
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Earth pressure system shield process
- Patent number 5,180,252
- Issue date Jan 19, 1993
- Kabushiki Kaisha Konoike Gumi
- Hiroshi Tanaka
- E21 - EARTH DRILLING MINING
Information Patent Grant
Shield tunnel boring machine
- Patent number 4,607,889
- Issue date Aug 26, 1986
- Daiho Construction Co., Ltd.
- Hakumi Hagimoto
- E21 - EARTH DRILLING MINING