ISSN:
1570-1468
Source:
Springer Online Journal Archives 1860-2000
Topics:
Energy, Environment Protection, Nuclear Power Engineering
Notes:
Conclusions 1. The craneless method of delivery and placement of concrete in horizontal (long) blocks of massive dams, developed and introduced by Narynénergostroi of the Main Administration for Construction and Installation of Hydroelectric Plants of the East (Glavvostokgidroénergostroi) with the participation of VNIIG Gidroproekt, and Orgénergostroi, is quite promising and meets the current requirements of the construction of concrete structures. 2. The method provides: a) complete mechanization of the complex of intrablock work performed by simple mechanisms without the use of concrete-placing cranes consuming large amounts of energy and metal; b) uniform raising of the entire structure at a rate up to 3.5 m/month and favorable state of thermal stresses in the concrete, precluding dangerous crack formation; c) possibility of using effective surface cooling of the placed concrete and eliminating expensive deep precooling; d) twofold decrease in labor requirements in comparison with crane methods; e) as much as a 20% reduction in the cost of 1 m3 of concrete; f) the use of stiff concrete with a slump not more than 1–3 cm, reducing the use of cement to 220–200 kg/m3; g) increase in the uniformity of the concrete and consequently of concrete quality, which is govemed by GOST 4795-68. 3. The method is most expedient in the construction of massive nonreinforced structures. Therefore, the designs of structures being constructed by the indicated method should have, as far as possible, simple outlines with a minimum of shafts, galleries, etc. 4. For purposes of further improving the method and increasing its effectiveness it is necessary to create: a) powerful vibrators providing thorough working of stiff concretes in layers up to 1.5 m; b) 20-ton concrete placers with a body capacity up to 8 m3 with a small turning radius, short base, and good visibility from the driver's cab; c) battery-powered machines for removing laitance; d) small pneumatic-tired cranes for working under the tent with a load moment of 25–30 ton·m and battery-powered as far as possible.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02400036
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