| 摘要 |
The invention relates to a process and apparatus for laying a product of great length (40) in the ground. As a furrow is formed by breaking up the ground a tube is laid in the furrow and, at the same time, the product is pulled inside the tube, at one end by means of a magnetic pulling device including a yoke and a core received in the tube and the yoke. The yoke and core produce a radial magnetic field between them capable of axially immobilizing the core in relation to the yoke. The tube is in the air gap between the yoke and the core and the product is fixed to the core. The pulling force applied to the product is produced by displacing the yoke as the tube is laid.
|
