39 a b in which a pin 34 a b attached in the central wedge member 31 extends the radial outer surface of the inner clamping plates 30 is provided with a number of vertical teeth 36 a 36 b and 36 c with which the inner clamping plates 30 engage counter to axial sliding in corresponding teeth on outer clamping plates 37 placed against it as can be seen in fig3 the outer clamping plates 37 are tightened against the inner clamping plates 30 by means of a number of bolts 41 furthermore it can be seen that the outer clamping plates 37 are provided with two series of teeth 38 a 38 b that are inclined with respect to each other and separated from each other by a vertical slit 35 the teeth 38 a 38 b can as a result be formed straight in horizontal direction and still be correctly oriented for an optimal engagement of the inner surface of the pipe 8 when the pipe 8 has to be vibrated into the bed 4 both offshore and onshore the clamping device 11 is attached to the vibrator block 1 lowered in the upper end of the pipe 8 until the plate 40 rests on the upper edge of the pipe 8 subsequently via gate 17 the space 18 is pressurized at a predetermined pressure which is very high for instance 320 bar u2014 adjusted to the radial outward pressure maximally to be taken by the tube depending on the thickness of the wall and the kind of material u2014 as.