A method of flat bottom dredging of a bed at least partially covered with liquid from a floating pontoon (12) comprises controllably rotating a ladder (14) with a cutter head (26) toward the bed to set the dredge depth and force with a first hydraulic system (18); adjusting the cutter head position with a second hydraulic system (22) so that it is level with the bed; and continuously adjusting the ladder depth and force and the cutter head position while dredging through a control system (30) which receives sensor signals.

Bottom leveller system

Support leg arrangement of a work machine (1) like a dredger meant to work in water systems in which arrangement the support legs are meant to extend to the bottom of the water system in order to keep the work machine (1) in its place during the working in which case at least one pair of support legs consists of arms (3) which are at their upper end attached to the work machine (1) with the help of a joint and the mentioned arms (3) can be turned underneath the water surface with the help of a power device, such as a hydraulic cylinder (2) when the lower ends of the arms (3) are meant to extend to the bottom of the water system and that the lower ends of the arms (3) are equipped with an expansion part, such as with an air container (4) or a paw (12), (13) resting on the bottom. In order to adjust the path of the lower end of the arm (3) to reach as deeply as possible at the extreme position of its turning movement, but not however to the area which is directly underneath the work machine (1) and in front of it, the mentioned expansion part (4),(12),(13) resting on the bottom is equipped with an anti-skid device, (14) and/or with a supporting structure (15) which increases the reach of the support leg downwards at the extreme position of the turning movement of the arm (3) both when the arm (3) is being used without an extension part (6) and when the arm (3) is being used with an extension part (6).

Support leg arrangement for a work machine like a dredger

The present invention relates to an improvement to dredging barges and more particularly to barges of modest overall dimensions, transportable by road in order to gain access to work sites of all types. The barge according to the invention comprises a hull 1 divided into compartments and a deck made from polyester around a rigid chassis on which are fixed, at the front, the means of dredging and laterally, means of the telescopic articulated leg type disposed, on the one hand, at the front in order to provide stabilisation and, on the other hand, at the rear to provide propulsion.

Improvements to dredging barges

The present invention relates to a machine for gathering up viscous or pasty products and more particularly a machine designed to gather up residues of hydrocarbons deposited both in storage tanks and in transport tanks on a boat, for example. The machine for gathering up viscous or pasty products according to the invention comprises a chassis 1 equipped on the one hand with two laterally positioned wheels 3 and on the other hand with two heads of a handlebar 4 located at the extreme rear of the chassis 1; the said chassis 1 supports an assembly consisting on the one hand of two collecting heads 7 comprising helical and spiral-shaped buckets 15 towards the front of the chassis, and on the other hand of a positive displacement pump 8 delivering the viscous or pasty product.

Machine for gathering up viscous or pasty products

The present invention relates to dredgers for clearing yachting harbours This dredger consists of a platform 1 set up on two floats 2 with, at the rear, movable anchoring piles 6 and, outside the perimeter of the platform, a submerged boom 6 provided, at its end, with the dredging tools; this boom 9 is connected to a vertical pole 10 guided in translation and in rotation in a frame arranged at the front of the platform 1 and anchored, in the working position, on the sea bed The frame consists of a vertical support 20 provided with two horizontal cradles 22, 23 comprising the means for controlling and guiding the pole in translation and in rotation The pipe for discharging the material comprises a rigid section 15 secured, at one of its ends, to a carriage 18 which can move in translation in a rail 19 arranged under the platform 1, the other end of the rigid section 15 being connected, by a flexible pipe section 16, at the level of the lower part of the pole, to the pipe for discharging the boom material

Anselme Briand

Papers

Improvements to dredging barges

Machine for gathering up viscous or pasty products

Dredger for clearing yachting harbours