Messer shield excavating apparatus and messer shield method

摘要

The invention expand (or shrink) excavation method using the Messer Messer shield shield rigs with them for about that , in the following construction of the shield rigs to a predetermined Messer and sediment tunnel with a cross-sectional size , expanding the section in the tunnel ( in or out ) to be excavated , if necessary , without excavation constructed as an extension of the conventional (25 ) having the Messer plate 20 ' to be connected by the width direction or to enlarge the height , enlarge or reduce the cross-section of the tunnel freely to be able to ensure the improvement of workability and reliability .