Construction of the Dnestr hydrofacility requires the solution of complex problems associated with power generation, regulation of river flow, and the creation of water reserves for irrigation. According to the original design for the hydrofacility, a concrete gravity-type dam plus a powerhouse built into the dam, with an overall concrete volume of 1.5 million m a, were to be constructed. In this scheme, the use of fly ash as an additive to the concrete to replace part of the cement (chiefly for the intramassive zones) is extremely expedient and could have a significant economic effect.The most recent design was reviewed, however, and according to final approved plans, a spillway-type powerhouse with right-and left-bank earth-rock dams was adopted. A n assembly platform abuts the powerhouse on the right bank. Comprising the hydrofacility are the 53.5-m left-bank dam, the 165=m powerhouse, the 197=m rightbank dam, and the 48-m assembly platform. Because of a nonuniform daily load on the units, a buffer reservoir was designed to control the downstream flow of the Dnestr. The head at the power station is computed to be 40.5 mand the installed capacity to be ~702,000 kW. Structurally, the powerhouse consists of three sections, each .53 m long and 55 m wide with a maximum height of 80 m. Six diagonal hydroturbine units rated at 117,000 kW are installed in the powerhouse.An additional expansion joint, which runs along the axis of the central forebay, divides the upper half of each section to reduce temperature stresses. The powerhouse is a complex spatial structure consisting of an upper slab that follows the curved outline of the spillway, a series of vertical wails and horizontal floors that form the service compartments, and a lower foundation slab, as well as a space where the units, penstocks, and draft tubes are located. The blocks are divided by the vertical wails of the forebays. The thickness of the vertical wails and horizontal slabs ranges from 2 to 4 m. Concrete blocks up to 9 m thick are built into the foundation slab on the upstream side. Thus, the reinforced=concrete structures of the powerhouse will consist of elements that arecomparalively thin-walled for hydraulic construction; in this case, there is virtually no massive concrete. The overall volume of concrete in the hydrofacitity amounts to 92~,000 m 3. Table 1 shows the distribution of the volumes of monolithic concrete (thousands of m 3) placed according to grade and structure.
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