Method and device for stabilizing a cavity excavated in...

Details Method and device for stabilizing a cavity excavated in... Method and device for stabilizing a cavity excavated in...

2008-07-29

2008-07-29

Mayo, Tara L. (Department: 3671)

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

Lining

C405S135000, C405S263000

Reexamination Certificate

active

11052221

ABSTRACT:
A compression body is inserted into the contraction joint between two tunnel lining elements, which body deforms in response to a compressive load caused by the tunnel lining elements moving towards each other. The compression body is composed of a material containing voids, and has a compressive strength of at least 1 MPa and a void fraction of between 10% and 90% of its total volume. The compression body may be composed, for example, of steel foam, or of a mixture which contains cement and blown-glass particles or plastic particles.When a predetermined compressive load is exceeded, the voids within the compression body collapse in a stepwise manner, or are compressed in a stepwise manner.

REFERENCES:
patent: 2230032 (1941-01-01), Freyssinet
patent: 5992118 (1999-11-01), Wagner et al.
patent: 2003/0154683 (2003-08-01), Bache
patent: 197 16 514 (1998-06-01), None
patent: WO 99/28162 (1999-06-01), None
patent: WO 00/55567 (2000-09-01), None
Usdoe, Kremer et al., Oct. 20, 2004, “Development of Steel Foam Materials”, entire document.

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