Vízügyi Közlemények, 1935 (17. évfolyam)

Kivonatok, mellékletek - Kivonat az 1. számhoz

20 fore each pump and engine must have reserve supplies of 100 per cent. Great care has to be taken to maintain a vacuum in the suction pipes. D. In Hungary the principle of lowering the ground-water table was employed by M. Kajlinger at a rather early period, when the Budapest waterworks and city subways were being constructed (1895), and the ground-water was pumped from porous limestone-rings. As a modern method, it was first employed in the constructions carried out in connection with the regulation of the Soroksár Danube-branch. The article describes the works after this method so far carried out in this country (table I) : 1. Lock and water power plant at Tass, 1926 (pictures 1—4). 2. Sedimentation basin of the Budapest Electric Works, 1927 (pictures 5—7, fig. 17—18). 3. Diversion dam in the Tur Canal at Sonkád, 1928—29 (pictures 8—11, fig. 19). 4. Overflow dam at the opening of the Tur Canal, 1929 (pictures 12—15, fig. 20—21). 5. Pumping plant at Makád, 1929 (pict. 16, fig. 22). 6. Surface drainage sluice at Tass, 1931 (pict. 17, fig. 13). 7. Sewage settling basin at be Central Market Plant, Budapest (pict. 18, fig. 23). 8. Bus-garage, Budapest, 1929 (fig. 24). The costs of this foundation method (table II.). compare favourably with those of any other method, especially in the case of foundation pits larger than 500 square metres in area. But there are special cases, when this method is the only one which can properly be employed, such as : 1 Removing water from pits of large extent. 2. Construction of a footing sheet of reinforced concrete requiring complicated preparation. 3. In quicksand where loosening of the soil is to be absolutely avoided, and concrete under water does not serve the purpose. 4. In special circumstances, such as in the immediate vicinity of an old building, or when it is an object to diminish Artesian water pressure. IV. PUMPS ON A NEW SYSTEM IN THE SERVICE OF SURFACE DRAINAGE. By V. KIENITZ. The centrifugal pump is an appliance indispensable for hydraulic structures, but is has different disadvantages, such as low degree of efficiency, high prime cost, and difficulties of setting in motion ; it may therefore be profitably replaced by the axial pump. The latter is especially fitted to low lifts, and may be driven by gas engines of rapid motion, or electric motors. By virtue of these qualities it is serviceable for lifting drained surface waters from one canal to another, when the level of the recipient watercourse is higher than that in the drainage canal.