| 摘要 |
A device for processing a concrete layer by water jets comprises a jet tube (7) arranged on a carriage (6) moveable to and fro along a guide (5). The jet tube (7) is pivoted about an axis (13) substantially parallel to the guide (5) and arranged to oscillate about an axis (15) in planes making an angle with the guide. The jet tube (7 ) is inclined in one direction along the extension of the guide (5) during the movement of the carriage (6) along the guide (5). A control unit ensures that pivoting of the jet tube (7) with an angular velocity leading to movement of a nozzle of the jet tube along th e guide (5) with a velocity substantially equal to the velocity of the carriage (6) is initiated at the same time as the carriage ( 6) is stopped in an end position, The control unit is also arranged to start the movement of the carriage (6) when the jet tube (7) has finished its pivoting movement.
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