TEMPORARY SEGMENT STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide temporary assembling segments which enable a complete roundness keeping device to advance and which can be easily opened at the top after the complete roundness keeping device has advanced. SOLUTION: This temporary assembling segment structure which is approximately cylindrical in shape is used in a vertical shaft as reaction support for advancing a shield machine having a complete roundness keeping device. The temporary assembling segment structure includes a body portion 11 comprising RC segments 5a circumferentially and axially joined with one another and provided with an opening 11a at its top, and press support 12 provided to close at least a portion of the opening 11a and adapter for supporting the complete roundness keeping device while the device is pressed from above when passing. The press support 12 comprises steel members and includes suspending metal fitting 17 for hanging the pressure support 12 and erector suspending metal fitting 13.