| 摘要 |
PCT No. PCT/FR89/00427 Sec. 371 Date Apr. 25, 1990 Sec. 102(e) Date Apr. 25, 1990 PCT Filed Aug. 23, 1989 PCT Pub. No. WO90/02227 PCT Pub. Date Mar. 8, 1990.A self-propelled machine for concreting a ditch includes a caterpillar band which contacts and rolls on the bottom of the ditch, a propulsion unit for driving the displacement belt, and a spreading system for spreading concrete on the bottom and sides of the ditch. |
