Application in mining

Our wet-mix shotcrete line is not just a series of machines, but represents an extremely modem, economic, state-of-the-art cavity lining process for long-life under workings, segments, tunnels, inclined shafts, shafts, galleries, cellars, etc., which even in the time necessary for releasing mountain stresses supports the mountain rock, thus creating a system of reciprocal interworking in which the lining takes up the pressure caused by the driving of the cavity, distributing it in such a manner over the rock and the lined cavity that both bear it without being destroyed. In the cause of conventional lining with wood, steel ring supports, concrete blocks, etc., the stresses on the lining take place by chance at various points on which the loads are concentrated.

In our new lining process, by applying a so-called contact layer of wet-mix shotcrete directly after opening up the cavity, the stress on the lining is distributed in such a manner that it is absorbed at every point of the lining. In this way, a closed pressure regulating system is achieved creating an economic load level which is borne jointly by the contour rock and the lining.

On the basis of the latest rock mechanics findings, using this lining procedure a lining resistance can be achieved equal to 16 times that of a conventional sliding arch-type support lining.

Within the new lining procedure, fully mechanised and continuous driving and lining can be coordinated with one another in time and location. Using the wet-mix shotcrete process, a homogeneous, good-bearing monolithic reinforced concrete construction is produced complying with all concrete technology requirements, and with DIN 1045. In addition, the MAK threshold limit values required by the liability insurance agency are fully met. (MAK - maximum workplace concentration of dust nuisance)

The economic efficiency of this lining procedure is shown by the thinner, but all the better bearing concrete strength, the resultant smaller excavated cross-section required and the subsequent saving in fining material. Through the reduction in workings required, the lining times are considerably shorter. A longer working life for the lined stretch and the lack of any need for maintenance works are further points having a positive effect on the economic efficiency aspect. The factors listed have brought a reduction in construction costs of 20-40 % in the projects carried out up to now - lining of stretches, tunnels, inclined and longitudinal shafts (approx. 60 km).

We have references available on the economic efficiency and high standard of the technology, which we would be happy to make available to you. This procedure is also in use In civil and underground engineering, in reconstruction works, as well as in processing insulating materials in the field of thermal insulation. We are, of course, available to answer your questions personally.

The main advantages of the new lining procedure ere: