| 摘要 |
In a device for driving or extracting tubes or piles into or from the earth, the driving component is produced by means of a piston oscillating in a cylinder in the direction of the tube or pile axis and having a driving action on one side. Coaxially arranged cylinders (2, 3) are provided with two driving components, acting in opposite directions to one another, of the two pistons (4, 5), which can be actuated independently of one another. <IMAGE>
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