Method and device for stabilizing a cavity excavated in underground construction
OwnerKalman Kováriinventor
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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.
Claims22
A method for stabilizing a cavity excavated in underground construction, in which the cavity is secured by supporting means and the pressure exerted by the rock on the supporting means is directed through at least one compression body which deforms when a predetermined compressive load is exceeded, which body is composed of a material containing a predetermined volume fraction of voids, wherein a compression body is employed which contains blown-glass particles forming the voids and steel or plastic fibers as reinforcement elements, the blown-glass particles and the reinforcement elements being embedded in a cement binding means.
A device for stabilizing a cavity excavated in underground construction, comprising supporting means to secure the cavity, and at least one compression body, which body deforms in response to the compressive load exerted by the rock on the supporting means when a predetermined compressive load is exceeded, and which body is composed of a material containing a predetermined volume fraction of voids, the compression body containing blown-glass particles forming the voids and steel or plastic fibers as reinforcement elements, the blown-glass particles and reinforcement elements being embedded in a cement binding means.
The device according to 13, wherein the compression body is a multiplayer composite body.
Dependencies are inferred from the claim text.