| 摘要 |
<p>PROBLEM TO BE SOLVED: To inject an additive into excavation soil with respect to a shield machine, and to improve the strength of a blade part agitating and mixing the additive with the excavation soil.SOLUTION: A mixing blade 15b which injects an additive into a chamber 6 of a mud pressure shield machine 1 and agitates and mixes the additive with excavation soil in the chamber 6 comprises: a large-diameter part BD which projects into the chamber 6 from a machine inner side through a through hole 7a of a partition wall 7; and a small-diameter part SD which extends from a tip of the large-diameter part BD toward a working face side. The large-diameter part BD is formed of a cylinder body, and the small-diameter part SD is formed of a cylinder body provided movably along a hollow path in the large-diameter part BD while having its axis aligned with the axis of the large-diameter part BD. The large-diameter part BD can improve the mechanical strength of the mixing blade 15b.</p> |
