The temporary or permanent securing of steep inclines and construction pits using soil and rock nails is a key feature of Stump-Franki’s range of activities. This proven construction method, which has received general building approvals, has been greatly influenced and developed by our company since its first appearance on the market.
Tight-connecting round bars, or nails, are arranged in such a way as to securely absorb any earth pressure that may arise in the loose rock of a monolithic body. GEWI steels are used as supporting elements. These are encapsulated in a ribbed pipe injected with a cement suspension to prevent corrosion in permanent installations.
Depending on the application, it may be possible to use cuttable tension elements made from fibreglass, known as GFK elements, or self-tapping nails to secure tunnel driving works. The upper surfaces, where loose rock is first secured by soil or rock nails, are then stabilised with a statically measured and reinforced layer of shotcrete. The ideal arrangement and dimensioning of the necessary securing elements is calculated by our engineers using state-of-the-art calculation procedures.
Approval (PDF): Bodenvernagelung System Stump (Z–20.1–104) (only available in German)