Vízügyi Közlemények, 1974 (56. évfolyam)

2. füzet - Rövidebb közlemények és beszámolók

318 Bognár Győző g) A hydraulic rock grab mounted on an excavator is shown in operation on the construction of a river regulation rock structure in Fig. 12. In Figs. 13 and 14 a hydraulic rock splitter and an experimental rock loading machine, respectively, are shown. h) For sinking wells and open caisson foundations of smalt depth (8 to 15 m) and of large diameter (1 to 1.2 m) a high-capacity hydraulic pipe rotator and excavator has been developed (Fig. 15), which consists of an 0.5 cu.m excavator with special clamshell attachment, of a hydraulic pipe rotator and jacking equipment. i) The exploration and utilization of artesian waters from aquifers at greater depths are problems of great significance and frequent occurrence in Hungary. Two advanced standard rigs have been designed and manufactured for this purpose, one lor depths down to 300, the other for such down to 500 m depth (Figs. 16 and 17). The equipment is mounted on a two-axle trailer of 8 tons capacity.