DISPOSITIVO PER IL COMANDO DEI CILINDRI IDRAULICI DI SPOSTAMENTO DEL LA CASSERATURA DI TESTA NELLA REALIZZAZIONE DI RIVESTIMENTI DI CALCESTRUZZO GETTATO IN OPERA PER COSTRUZIONI SOTTERRANEE SOPRATTUTTO PER GALLERIE CUNICOLI CONDOTTE SOTTERRANEE E SIMILI

摘要

A hydraulic control system serves to control the operation of hydraulic rams used to position and displace an annular member which delimits a concrete reception space disposed at the rear of a tunnel-driving apparatus. The system acts to compensate for irregular loading on the annular member to ensure the latter is drawn up behind a forward drive shield without twisting or tilting. The rams are divided into groups each connectible to its own pump unit and the system connects the chambers of the rams which reduce in volume as the member is drawn up to the pump units in a manner such that the latter act as brake motors to restrain the member against the concrete pressure differential on its rear side.