Abstract: A structural body is composed of a number of sections which are placed on one another and joined together. According to the invention, the sections, which consist of urethane foam or like plastic material, are provided, at least on one side and preferably on both sides, with a thin metal sheeting, and that the various sections are so shaped that their joining faces are congruent.The superposed sections, the joining faces of which are congruent, are cut out of sheets by means of a preferably computer-controlled laser.

Abstract: A space framework comprises two multi-wire systems of spirally-wound wires, the wires which, in the one system, are wound in the one direction, and, in the other system, are wound in the other direction, being interconnected at points where they intersect. In the manufacturing process, the wires in both systems are wound simultaneously in opposite directions during simultaneous advancement. In this instance, the wires are stretched and shaped about a forming device. The wires are then interconnected at those points where, in the winding operation, they intersect at the outer contour of the space framework.A machine for manufacturing a space framework consists of magazines for supplying the wires in both systems, for winding purposes, a templating and welding device for the wound wires, and an advancement means for the space framework produced at the templating and welding device.

Abstract: For the exploitation of the geothermal energy in an active submarine volcano an elongated, substantially vertical, columnar concrete body is arranged above the orifice of the volcano so as to extend from the water surface vertically downwards through the water and into the magma in the orifice of the volcano so that the lower portion of the concrete body is submerged in the magma. The concrete body has such a displacement and such a weight that it floats in a balanced vertical position in the water and the magma. A coolant, preferably water, is circulated through internal cooling ducts or pipes in the concrete body from the upper end of the body downwards into the lower portion of the concrete body, which is submerged in the magma and where the coolant is heated by heat transfer from the surrounding magma, whereafter the heated coolant is returned through internal cooling ducts or pipes in the concrete body to the upper end thereof, where the heat content in the heated coolant is utilized.