E21D 9/01
Methods or apparatus for enlarging or restoring the cross-section of tunnels
Official title: Methods or apparatus for enlarging or restoring the cross-section of tunnels, e.g. by restoring the floor to its original level
E21D9/01 (Methods or apparatus for enlarging or restoring the cross-section of tunnels) appears on 16 US grants and 7 published applications in this corpus.
Search patents in E21D- Granted patents
- 16
- Published applications
- 7
- Assignees
- 14
- Inventors
- 61
- Latest grant
- 17 Sep 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 2 |
| 2016 | 1 | 0 |
| 2017 | 1 | 1 |
| 2018 | 1 | 1 |
| 2019 | 1 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 1 |
| 2024 | 2 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Method for monitoring resilience of shield tunnel based on multi-source heterogeneous data17 Sep 2024US 12,091,976 B1Shenzhen University
- Support method of preset internal cable for in-situ tunnel expansion project27 Feb 2024US 11,913,338 B2Fuzhou University
- Tunnel construction method using pre-support and post-support and apparatus suitable for same23 Jul 2019US 10,358,920 B2
- Device for back soil disturbance in shield tunnel18 Dec 2018US 10,156,139 B2Powerchina Huadong Engineering Corporation Limited
- Auxiliary tunneling apparatus11 Apr 2017US 9,617,853 B2Komatsu Ltd.
- Rebar carriage for the construction of concrete structures3 Jul 2025US 2025/0215707 A1Grupo Empresarial Tecozam SL
- A support method of preset internal cable for in-situ tunnel expansion rpoject2 Nov 2023US 2023/0349293 A1Fuzhou University
- Tunnel surrounding rock supporting method and system based on tunnel field deconstruction and reconstruction theory8 Dec 2022US 2022/0389815 A1China Railway Tunnel Co., Ltd.
- Tunnel construction method using pre-support and post-support and apparatus suitable for same6 Sep 2018US 2018/0252104 A1Hyun Engineering and Construction Co., Ltd
- Device for back soil disturbance in shield tunnel23 Nov 2017US 2017/0335687 A1Powerchina Huadong Engineering Corporation Limited
Most cited
By later US patents
- Hard rock trench cutting machine35US 4,035,024 AJarva, Inc. · 1977
- Hard rock trench cutting machine having anchoring and steering structure26US 4,312,541 AJarva, Inc. · 1982
- Flighting section and tooth holder21US 4,480,873 A1984
- Ground excavating apparatus14US 4,070,772 AKabushiki Kaisha Komatsu Seisakusho · 1978
- Method for constructing an enlarged tunnel and apparatus for forming the same7US 4,618,298 AMitsui Kensetsu Kabushiki Kaisha · 1986