Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Elimination of cofferdams when constructing hydroelectric stations
Conclusions In the case of loosening blasting of cofferdams with subsequent excavator mucking of the rock mass, the use of the blasthole charge method is most effective. In this case, when blasting rock pillar-cofferdams having the III–IV category of jointing, it is necessary to use the parameters calculated for fine crushing of the rock mass.In the case of excavating blasting of cofferdams, linear charges are becoming most popular. In individual cases, determined by the particular working conditions, linear charges can be simulated by rows of adjacent largediameter holes or can be replaced by chamber charges. In the case of blasting with a one-sided backwater, the explosion of underwater charges provides complete directivity of ejection. In this case, if ejection should be directed toward the backwater, these charges should be detonated first, and if ejection should be directed toward the pit, last. From the viewpoint of protecting the pit from its blocking by the blasted mass, it is more effective to direct the ejection toward the backwater, which is achieved by detonating the underwater charges first.
Elimination of cofferdams when constructing hydroelectric stations
Conclusions In the case of loosening blasting of cofferdams with subsequent excavator mucking of the rock mass, the use of the blasthole charge method is most effective. In this case, when blasting rock pillar-cofferdams having the III–IV category of jointing, it is necessary to use the parameters calculated for fine crushing of the rock mass.In the case of excavating blasting of cofferdams, linear charges are becoming most popular. In individual cases, determined by the particular working conditions, linear charges can be simulated by rows of adjacent largediameter holes or can be replaced by chamber charges. In the case of blasting with a one-sided backwater, the explosion of underwater charges provides complete directivity of ejection. In this case, if ejection should be directed toward the backwater, these charges should be detonated first, and if ejection should be directed toward the pit, last. From the viewpoint of protecting the pit from its blocking by the blasted mass, it is more effective to direct the ejection toward the backwater, which is achieved by detonating the underwater charges first.
Elimination of cofferdams when constructing hydroelectric stations
Davydov, S. A. (Autor:in)
1988
Aufsatz (Zeitschrift)
Englisch
BKL:
56.30
Wasserbau
Lokalklassifikation TIB:
770/6550/8000
Elimination of cofferdams when constructing hydroelectric stations
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