An Invert Concrete Screeding Machine for Shield Tunneling

The invert concrete screeding machine was developed to improve screeding accuracy, free workers from hard lab or, reduce any workers and rationalize work. The screeding machine consists of two guide rails, a moving device to run forth and back between guide rails, a blade with a vibration motor that screeds a concrete face smoothly, and a vertical movement device that moves the blade up and down. This report describes the outline of the invert concrete screeding machine, as well as results of application of the subway construction work.