Abstract: A bulkhead for manufacturing underground structures such as earth cavities in a closed construction method, formed of sealing walls arranged as an enclosure and sealing earth masses to be removed against ground water, wherein the sealing walls are formed of a hardened mixture of bentonite-cement injected under pressure into the ground, characterized in that the sealing walls inserted into fine sand or silts are arranged in the form of a roof and are formed as a substantially elastically deformable bulkhead envelope by adding filler to the mixture of bentonite-cement. Preferably, the bulkhead sealing walls of the bulkhead envelope extend from a central ridge line on the earth surface or below it downwardly in an obliquely diverging direction into water-impermeable soil. The bulkhead can be made airtight so that a vacuum can be applied to the earth mass enclosed by the bulkhead envelope.

Abstract: For a method for compacting garbage dumps (10) by means of depth vibration, which is carried out by means of at least one depth vibrator (4) and puts the dump mass (1, 2, 3) into vibration, one area after another, and compacts it in this way, with depth vibration taking place while a flushing fluid is added, it is provided that liquid nitrogen (8) is added as the flushing fluid during depth vibration. The apparatus for implementing this method is structured in such a way that the depth vibrator (4) has a separate flushing fluid line (9) to feed liquid nitrogen (8) into the bore hole.

Abstract: A method for increasing the capacity of a garbage dump to allow additional garbage to be dumped therein, in which a depth packing device, such as a vibrator or ram, is lowered from the surface of the dump down to a predetermined depth to form a hole surrounded by compacted garbage; additional garbage is then placed in the hole and additionally compacted by the same depth packing device used to form the hole. If a vibrator is used, the additional garbage is dispensed from the vibrator tip as the vibrator is withdrawn from the hole so that a compacted column of garbage is formed. A ram device comprising a pipe having a removable closure at the lower end may also be used. As the pipe is withdrawn from the hole, additional garbage is placed through it and out through the lower closure; the additional garbage is compacted with a weight guided through the pipe.