Abstract
1. The use of bucket dredges capable of excavating water-covered, dense sand-gravel-boulder deposits is advisable and effective. 2. The standard bucket ladder can be lightened by reducing the bucket wall thickness, or the bucket capacity can be increased, using the same weight. 3. As a grading device, use should be made of barscreens of the heavy type, SM-690 for instance. 4. With regard to the type of soil transportation to the bank, the machine should be universal, permitting hydrotransportation or use of floating conveyors. 5. Erection and disassembly of bucket dredges is labor- and time-consuming, hence, development of demountable, easily transportable machines should be sped up.
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