Abstract: A method for the monitoring of deformation of components with light waveguides which are connected securely to the component at least over part of the length of the latter and are connected to a measuring apparatus with which the transmitting capacity of the light waveguide and the transit time and/or the damping of the light pulses sent through the light waveguides are continuously or intermittently monitored. The light waveguides are prestressed such that they remain in tension at all levels of deformation expected.
August 24, 1990
Date of Patent:
September 3, 1991
Reinhard Wolff, Hans-Joachim Miesseler, Martin Weiser
Abstract: A corrosion measuring cell for establishing the start of corrosion and/or for measuring the degree of corrosion of structural or reinforcing steel, which is embedded in a concrete structural part, has a corrosion-resistant cathode electrode, and several ordinary steel anode electrodes spaced from one another at different distances from the external surface of the concrete structural part.The anode electrodes are each connected to a cathode electrode through a current-measuring device which measures current due to corrosion at the anodes in order to establish the temporal course of carbonatization or chloridization taking place in the concrete. The connections may be switched between the measuring device and a polarizing device which polarizes the anode electrode in such a manner that the corrosion current, and thus the corrosion of the anode electrode, stops when desired to avoid damage to the concrete.
Abstract: A stressing element of fiber composites is disclosed as well as a process and device for the stressing and anchorage of such a stressing element, in which the stressing element ends are embedded in synthetic resin mortar in a transversely-corrugated anchoring or stressing sleeve, which deforms during stressing and allows cracks caused by stretching of the stressing bars inside the sleeve, which cracks divide up the anchorage body over a part of its length into slices and thereby allow a movement of the stressing bars under a vibrational loading effect. After stressing, the stressing bars of the stressing elements can be anchored by anchorage mortar introduced directly into encasing tube widenings.
Abstract: Concrete fender pile having prestressing members (19, 20) of elongated, high-strength fiber composite elements (21) with a low modulus of elasticity which, during a ramming impact (p), permit a large elastic deflection of the fender pile (14) and are insensitive to aggressive environmental effects.
Abstract: A container for the storage of radioactive elements, more particularly fuel elements or waste from reprocessing plant which produce heat and radiation over a long period of time, which container provides protection from external mechanical action and discharges heat from the radioactive elements, comprising: a block of heat-resistant reinforced concrete in which elongated chambers for receiving the radioactive active elements are arranged together with cooling systems which surround the chambers and which are connected in heat-conducting manner to the chambers to discharge the heat produced by the radioactive elements.
Abstract: By using a packer which is pushed as far over an anchor as the intended length of the moulding, the cavity in a borehole in the region of the bond can be completely filled with a reactive resin. Overhead work is possible even with slowly reacting resins. By using a catalyst on the packer, the reactive resin injected into the borehole behind the packer can be made to harden very rapidly.
Abstract: An anchorage device for a tension wire bundle of tension wires made of composite fibre materials, which are arranged in a plurality of layers. The tension wire layers are clamped between clamping plates non-slidable in the traction direction. The tension wire layer is clamped between two wedges slidable in the longitudinal direction. With this arrangement, the longitudinally slidable tension wire layer is clamped so that the tractive force acting in it is transmitted practically over its total circumference through the clamping elements to the wedges.