Vízügyi Közlemények, 1935 (17. évfolyam)

Kivonatok, mellékletek - Kivonat a 2. számhoz

20 each closed with a plug provided with a manometer. The simplest form of the manometer is a glass tube bent in the form of a syphon. This glass tube, filled with coloured water, affords a very sensitive instrument for this procedure. Now if water or air is pressed into one of the iron pipes, and at the same time a manometer mounted in another pipe shows an oscillation, we can be sure that between these two points the resistance is small, and the soil beneath the bottom of the building is not compact (fig. 1.). If the compressed air escapes through another syplion-manometer, we may be convinced that there is a cavity beneath the building between these two points. In this way, by pressing air or in certain cases water into each pipe in turn and observing the manometers mounted in the other pipes, we can easily and exactly determine the situation and extent of any underminings that have happened to form below the fondation of the building. VI. RESTORING WORKS ON THE PUMPING PLANT AT DECS. By S. MOLNÁR. (Pages 241—259.) The pumping plant at Decs was built in 1922 ; the machine house was founded on a soil of good bearing capacity, but the suction basin was placed on quicksand. In 1926, when a high flood of long duration occurred in the Danube, springs and soil sinking appeared near the plant. These symptôme appeared repeatedly also at the time of lower floods, and once the soil collapsed in an area of 2 square metres near the wall of the machine house. Work was suspended, and the origin and direction of the underground stream and the position of the undermining were determined by observing the movement of the ground-water and examining the subsoil. The troubles were abolished by laying drainage pipes, constructing sheet piling on the Larssen system, and pressing cement mortar into the subsoil. VII. RESTORING W

TORKS ON THE PUMPING PLANT AT ÉRSEKCSANÁD. By B. RESLI. (Pages 260—271.) In the pumping plant at Érsekcsanád, which was built in 1897 on bad subsoil without sheet piling, suspicious changes were observed, which gave reason to conclude that the ground-water had induced some disturbance in the quicksand below the foundation plate of the pumping plant, and that possibly underminings had also taken place. Last year the sluice was thoroughly examined by means of compres-