Abstract: The invention is a well pipe with longitudinal rods arranged in intervals in the pipe wall over the whole circumference. It is characterized by the fact that the well pipe is made of polymer concrete, and of an additional layer of packed gravel functioning as a filter if designed as a well filter pipe, and that the rods are glass fiber rods which transfer axial tensile load.

Abstract: In the process, the wet sewage sludge originating from a preceding mechanical dewatering is mixed with brown coal, brown coal coke or their mixtures in a weight ratio of sewage sludge to brown coal or its mixtures with brown coal coke of 1:3 to 3:1 and subsequently compacted wet at moderate compaction pressures above 50 bar to dimensionally stable mouldings. The briquetted mouldings can then be fed to a power station boiler as an auxiliary fuel to a thermal utilization or utilized chemically in a pyrolysis or gasification process for the production of fuel gas or synthesis gas.

Abstract: In a method of determining mining progress and the mined masses in open cast mining the position and orientation of the extraction device such as a bucket wheel of a travelling excavator are ascertained by means of satellite geodesy using a receiver in the vicinity of the bucket wheel and a further receiver at another location on the excavator.