| 摘要 |
PCT No. PCT/SE80/00294 Sec. 371 Date Jul. 20, 1981 Sec. 102(e) Date Jul. 20, 1981 PCT Filed Nov. 19, 1980 PCT Pub. No. WO81/01433 PCT Pub. Date May 28, 1981.For the ditching of drains normally various types of excavating machines are used. This involves problems, however, especially when the ground has poor carrying capacity, for example in wetlands. According to the invention, therefore, a body is proposed which has substantially V-shaped cross-section and smooth lower sides, and which is advanced through the soil masses to be removed for ditching the drain with a pointed end along the height of the body with a closed end facing in the direction of advancement. Simultaneously, the body is subjected to at least downwardly directed striking forces with relatively high frequency. In this way, the body is maintained pressed down into the soil masses while it is being advanced. The soil masses are thereby removed substantially in lateral direction by the side surfaces of the body and compacted. For effecting the striking forces, preferably a vibrator is provided within the body. |
