Implement for Processing, Particularly Sealing, Ground Surfaces Under Water, Particularly Bottoms and Embankments of Waterways, Particularly Canals, a Method for Setting Up the Same, a Method for Moving the Same, a Method for Sealing Ground Surfaces Using the Same, and the Like

Abstract

A working apparatus for processing, especially sealing, underwater bed areas, especially banks and bottoms of waterways, especially canals, a process for setting up said apparatus, a process for moving said apparatus and uses of said apparatus are described. The working apparatus comprises a plurality of polygonal hollow pipes arranged in parallel side by side and at least substantially without gaps, the upper ends of which form a horizontal, at least substantially flat working platform, wherein each hollow pipe has on its outer wall at least one projection extending substantially horizontally with a flange disposed on its outer end and extending vertically and at least one corresponding flange insertion aperture with a slot immediately above it which runs vertically and extends as far as the upper end of the hollow pipe, the flange insertion aperture being disposed further away from the upper end of the hollow pipe than the projection with the flange and being of greater horizontal dimensions than the slot, and wherein neighbouring hollow pipes are in engagement with one another via a respective projection on one of the hollow pipes with a corresponding slot in the other of the hollow pipes, such that the hollow pipes cannot be moved relative to one another in the horizontal direction and only at the outer edge of the working platform can at least one hollow pipe be pulled out individually in the vertically upward direction.

Description

The present invention relates to an apparatus for processing, especially sealing, underwater bed areas, especially banks and bottoms of waterways, especially canals, and a process for setting up said apparatus, and also a process for moving said apparatus. In addition, the present invention relates to a process for extensively incorporating minerals, mixtures of minerals or minerals consolidated with binders on an underwater bed area, especially banks and bottoms of waterways, especially canals, using the working apparatus, a process for removing silt from underwater bed areas, especially banks and bottoms of waterways, especially canals, using the working apparatus, a process for dredging waterways and bodies of water, especially in the tidal region, using the working apparatus, a process for creating dams in waterways and bodies of water, using the working apparatus, and equipment for driving on a working platform of the working apparatus.

In order to process beds and banks of waterways, floating equipment is used as the working platform, such as pontoons or ships. In some cases, the work is also carried out from the land where possible.

Conventional working platforms are, however, difficult to position and are vulnerable to waves and currents. Another disadvantage is that beds and banks of waterways can only be processed imprecisely in this way. Especially when it comes to installing seals, especially clay seals, under water, the problem arises that, after its installation, the seal is left open and unprotected for a lengthy period, so that scouring and damage can be caused by waves, currents and passing ships.

The present invention is thus based on the problem of providing a working apparatus or working platform which can be firmly positioned in a waterway, which is not vulnerable to waves and currents, which permits the precise processing of the bed and bank areas and which protects a seal once installed under water against scouring and damage caused by waves, currents and passing ships.

This problem is solved in accordance with the invention by a working apparatus for processing, especially sealing, underwater bed areas, especially banks and bottoms of waterways, especially canals, comprising a plurality of polygonal hollow pipes arranged in parallel side by side and at least substantially without gaps, the upper ends of which form a horizontal, at least substantially flat working platform, wherein each hollow pipe has on its outer wall at least one projection extending substantially horizontally with a flange disposed on its outer end and extending vertically and at least one corresponding flange insertion aperture with a slot immediately above it which runs vertically and extends as far as the upper end of the hollow pipe, the flange insertion aperture being disposed further away from the upper end of the hollow pipe than the projection with the flange and being of greater horizontal dimensions than the slot, and wherein neighbouring hollow pipes are in engagement with one another via a respective projection on one of the hollow pipes with a corresponding slot in the other of the hollow pipes, such that the hollow pipes cannot be moved relative to one another in the horizontal direction and only at the outer edge of the working platform can at least one hollow pipe be pulled out individually in the vertically upward direction. The working apparatus of the invention serves to process underwater bed areas and at the same time provides a working platform which can be firmly positioned on an underwater bed area. It is therefore also possible to speak of a working apparatus/platform or a combined working apparatus and platform. In addition, a process is provided for setting up the working apparatus on an underwater bed area, especially beds and banks of waterways, especially canals, characterised in that it comprises:

• (a) lowering a first hollow pipe onto the underwater bed area,
• (b) lowering a second hollow pipe next to the first hollow pipe until the or a flange insertion aperture of the second hollow pipe is on the same level as the or a flange of the first hollow pipe,
• (c) thrusting the flange insertion aperture of the second hollow pipe onto the flange of the first hollow pipe, and
• (d) lowering the second hollow pipe onto the underwater bed area, and
• (e) repeating steps (b)-(d) analogously with further hollow pipes to set up the working platform.

With the process of the invention, the upper ends of the hollow pipes form a horizontal, at least substantially flat working platform, which extends above the surface of the water. The working platform ought to be approx. 1 m above the water level, but this depends on the individual situation of the construction work, the waterway, the strength and load-bearing capacity of the bed and bank material and the tidal range.

The hollow pipes are preferably honeycomb pipes, such as hexagonal single honeycomb pipes and/or double honeycomb pipes formed from them, and optionally adapter pipes or end pipes, which may for example take the form of a one-and-a-half-fold hexagon and may be provided in order to create a relatively straight outer contour of the working platform when seen from above. The honeycomb pipes are conveniently from 1,500 mm to 3,000 mm in diameter, but depending on the application and/or load to be borne, they may also be smaller or larger in diameter. The length of the honeycomb pipes is determined by the depth of the waterway or body of water to be processed, the strength and load-bearing capacity of the bed or bank material and the tidal range.

Once set up, the working apparatus can be used either only as a working apparatus or in addition or alternatively as a working platform. If it is merely used as a working apparatus, it can be loaded and unloaded from floating equipment. Alternatively, it is also conceivable that the working apparatus is loaded and unloaded from land. If it is used both as a working apparatus and as a working platform, it can be loaded and unloaded from the working platform itself.

If the working apparatus is also used as a working platform, it is able, when loads are applied at specific points, to spread them over a wider area on the bed or bank of a waterway, so that it is possible to drive on the working platform with a working machine, such as an excavator, to carry out work in and on the waterway.

In addition, the present invention provides a process for moving the working apparatus, characterised in that the last row of hollow pipes in the direction of movement can be pulled out upwards, one after the other, and lowered again at the front end of the working platform in the direction of movement, until the or a flange insertion aperture of the lowered hollow pipe is on the same level as the or a flange of a neighbouring hollow pipe, the flange insertion aperture of the lowered hollow pipe is thrust onto the flange of the neighbouring hollow pipe and subsequently the hollow pipe is lowered onto the underwater bed area and this procedure is repeated once or a number of times as required for what then becomes the last row of hollow pipes in the direction of movement. In other words, the hollow pipes are moved from the last row of hollow pipes in the direction of movement to the front end of the working platform in the direction of movement.

Additionally, the present invention provides different uses for the working apparatus of the invention, namely processes in accordance with claims 21 to 24 and a working machine driving on a working platform of a working apparatus in accordance with any of claims 1 to 9, comprising an undercarriage and superstructure, the undercarriage having tracked running gear and the superstructure being provided with claw brackets which are designed such that they make it possible to turn the undercarriage in order to change the direction of travel of the working apparatus. While it is possible to drive on the working platform of the working apparatus of the invention with conventional working machines, such as a tracked excavator, this entails the disadvantage that the working machine damages the upper ends of the hollow pipes with the caterpillar track when it makes turning movements.

When it is necessary to change the direction of travel with the working machine of the invention, the working machine supports itself on the claw brackets, lifts itself and turns the tracked running gear. As it does so, the tracked running gear is suspended in the air on the superstructure and can turn freely without coming into contact with the working platform. Once the tracked running gear has been placed in the new direction of travel, the claw brackets are retracted again and the tracked running gear is lowered onto the working platform.

Dependent claims 2 to 9 relate to advantageous further developments of the working apparatus of the invention. The hollow pipes may, for example, be of different cross-sectional shapes. Apart from honeycomb pipes, i.e. hexagonal pipes, adapter pipes may be used in order to adapt to the particular situation or, for example, to create an at least substantially rectangular working platform.

In the process for setting up a working apparatus, it may be contemplated that at least two bulkheads are attached to the side of the working platform. The purpose of this is to seal off bank areas for processing against waves, currents and other influences. It is convenient for the bulkheads to be suspended in the hollow tubes and sunk into the bottom of a bank.

The invention is based on the surprising finding that thanks to the special design of the hollow pipes, a working apparatus with a working platform can be created in a simple and time-saving manner, which can be firmly positioned on the bed area of a body of water and can be dismantled, reassembled and moved or relocated in a simple and time-saving manner, and which is versatile for use in processing underwater bed areas. The system for joining the hollow pipes together is advantageously designed such that there are hollow pipes at the outer edge of the working platform which do not have any projections with flanges extending into them, so that they are particularly suitable for pouring material into the hollow pipe from above in order to deposit material onto an underwater bed area or to remove material from the underwater bed area. In addition, it is convenient that when a hollow pipe is removed, a hollow pipe located in front of it is automatically cleared which no longer has a projection with a flange extending into it.

With the working apparatus of the invention, it is possible to install sealing material in a controlled way and to deposit protective and ballast layers on top of it, without the sealing layer being exposed to the open water of a waterway, for example, without protection. In the process of the invention, sealing, protective and ballast layers deposited via the hollow pipe are built first of all against existing sealing, protective and ballast layers which have already been installed and secondly against the working platform. The working apparatus offers the sealing material ideal protection against harmful influences. While the hollow pipe is being pulled out, the remaining cavities formed because of the walls of the hollow pipes close automatically as the particles of the materials deposited are redistributed in the individual layers. Similarly, other minerals, mixtures of minerals and minerals consolidated with binders can be extensively incorporated on a bed or on banks under water.

In addition, the working apparatus of the invention enables a process for removing silt from underwater bed areas. In the state of the art, silt in waterways is removed or disposed of by means of dredging using an excavator positioned on a working platform. Another known process consists in siphoning silt off the bed of a waterway. In this process too, a suction apparatus is mounted on a working machine, unusually an excavator, which is positioned on floating equipment. In all the conventional processes, however, it is impossible to prevent further silt from flowing from the waterway into the area already dredged. This means that it is sometimes necessary for areas that have already been dredged to be reworked several times.

In the process of the invention for removing silt using the working apparatus of the invention, silt can largely be prevented from flowing back. The silt is removed, for example, by excavating in each separate hollow pipe of the working platform. This alone is enough to prevent further silt from flowing into the hollow pipe. Furthermore, the working platform moves forwards against the direction of flow of the body of water, in the course of which the silt is removed or excavated at the rear side, away from the approaching water. This prevents further silt from flowing into areas already dredged by the working platform.

The construction of dams in waterways and bodies of water is becoming more and more important in order to protect the population, facilities, especially port facilities, the environment and nature. These dam constructions are conventionally built out from the land using a pier head system, i.e. into the water. To do this, considerable areas of land have to be made available for the construction work, at the expense of the environment and nature.

With the working apparatus of the invention, dams can also be constructed in waterways and bodies of water from the water side. For this purpose, the hollow pipes are used to install the dam building material under water.

Just as in the process for removing silt in waterways, the deepening of waterways and bodies of water is currently performed from floating equipment if there is no possibility of carrying out the work from the land. Because of the effects of the tide, the floating equipment is dependent on particular tide times when the work can be carried out. At low tide for example, the floating equipment has to leave the work site so as not to run aground. At high tide too, the equipment has to be removed from the work site or, because of the high water level, cannot continue the work, owing to the limited range of the excavator arm.

When the working apparatus of the invention is used, work on deepening waterways and bodies of water can be carried out independently of the tide, since the excavation work is no longer dependent on the depth of the water. It is convenient for the excavation work on the working platform of the working apparatus also to be carried out by means of a cable excavator and clamshell buckets, so that the range of the excavator arm is no longer a limiting factor. Thanks to the deepening, i.e. excavation in each separate hollow pipe, the areas to be worked on can be processed precisely.

Further features and advantages of the invention will become clear from the claims and the following description, in which the embodiments are illustrated in detail with reference to the schematic drawings in which

FIG. 1 a shows a perspective view of two hollow pipes to be joined together;

FIG. 1 b shows a view of a different embodiment of a hollow pipe seen from above;

FIGS. 2 a to 2e show various stages of fixing the two hollow pipes from FIG. 1 together;

FIG. 3 shows a view of a working platform of the working apparatus in accordance with a particular embodiment of the invention seen from above;

FIG. 4 shows a view of a working platform of the working apparatus in accordance with a further particular embodiment of the invention seen from above;

FIGS. 5 a to 5c show various stages of advancing a working platform of a working apparatus in accordance with a particular embodiment of the present invention in a view seen from above;

FIG. 6 shows a view of a working platform of a working apparatus in accordance with a further particular embodiment of the invention seen from above;

FIGS. 6 a and 6b show various stages of a working platform of a working apparatus in accordance with a further particular embodiment of the invention in a view seen from above;

FIGS. 7 a to 7c show various stages of a process for sealing underwater bed areas in accordance with a particular embodiment of the invention;

FIG. 8 shows a process for removing silt in accordance with a particular embodiment of the present invention; and

FIG. 9 shows a view of a working machine in accordance with a particular embodiment of the invention, seen from the front.

FIG. 1 a shows two hollow pipes 10 and 12 to form a working apparatus in accordance with a particular embodiment of the present invention. The hollow pipes 10 and 12 are hexagonal in cross-section and each have, at their upper ends, a projection 14 extending orthogonally to the outer wall of the hollow pipe, or horizontally (see also FIGS. 2a to 2e), with a rectangular flange 16 disposed on the outer end thereof and extending vertically, and with a corresponding flange insertion aperture 18 on the opposite side, followed by a transition region 19 tapering towards the top, followed in turn by a slot 20 running vertically and extending as far as the upper end of the hollow pipe. In this case, FIG. 1 shows the hollow pipe 10 from the front and the hollow pipe 12 from the back. The flange insertion aperture 18 has larger horizontal dimensions b_F than those b_L of the slot 20. In addition, the distance a_F of the flange insertion aperture 18 from the upper end of the hollow pipe 12 is greater than the distance a_A of the projection 14 or flange 16 from the upper end of the hollow pipe 10.

FIG. 1 b shows a hollow pipe 10 with a projection 14 and a modified flange 16. Said flange 16 is designed as a round head.

FIGS. 2 a to 2d now show the procedure for setting up the working platform of a working apparatus in accordance with a particular embodiment of the present invention, partially in a perspective view and in section view in each case. This begins with lowering the hollow pipe 10 onto the bed area 22 under water 24 (see FIG. 2a). After that, the hollow pipe 12 is lowered next to the hollow pipe 10, until the flange insertion aperture 18 of the hollow pipe 12 is on the same level as the flange 16 of the hollow pipe 10 (see FIG. 2b). The flange insertion aperture of the hollow pipe 12 is then thrust onto the flange 16 of the hollow pipe 10 (see FIG. 2c), after which the hollow pipe 12 is lowered onto the bed area 22 under water 24 (see FIG. 2d). These steps are repeated in order to equip the working platform with further hollow pipes (not shown). In FIG. 2e, the hollow pipe 10 is pulled out upwards in order, for example, to relocate it at another end of the working platform or to dismantle the working platform.

FIG. 3 shows a resulting working platform 26 in a view seen from above where, in addition to the hexagonal hollow pipes 10 and 12, adapter pipes are provided, i.e. likewise hollow pipes, with the cross-section of one and a half hexagons, which have been labelled with the reference numeral 32.

FIG. 4 shows a corresponding view, but this time also with hollow pipes with the cross-section of double hexagons, namely 34 and 38.

In FIGS. 3 and 4, the hollow pipes 10, 12 with an hexagonal cross-section each have two projections 14 with flanges (two of which have been labelled with the reference numeral 16) and two flange insertion apertures each. The projections and the flange insertion apertures are arranged opposite each other in each case.

FIGS. 5 a to 5c show a process for moving the working apparatus of the invention in accordance with a particular embodiment of the invention. In order to make the Figures easier to understand, the hollow pipes are numbered by row, namely 1a, 1b . . . for the first row, 2a, 2b . . . for the second row and so on. In FIG. 5a, the hollow pipe 1a is in the process of being used to work on a bed area 22 under water, such as for sealing. After use, the hollow pipe 1a is pulled out upwards and fixed to a hollow pipe in the fourth row, namely the hollow pipe 4a, in the manner shown in FIGS. 2a to 2d and described accordingly. Ultimately, therefore, the hollow pipe 1a is relocated. This is done for all the hollow pipes 1a to if of the first row in succession. These are placed one after the other next to the hollow pipes of the fourth and fixed to them in the way already described. It goes without saying that the working platform or the working apparatus could also be moved without any work being performed on the bed area.

FIG. 5 c shows the situation in which the hollow pipes 1a to 1d have already been relocated.

FIGS. 6 a and 6b in principle show the same procedure, but in the region of the bank 40. In this case, two bulkheads 42 and 44 are suspended in the hollow pipes 2f and 4f to the side of the working platform 26 and are sunk into the bottom of the bank 41. At the same time as the hollow pipe 2f is relocated, the bulkhead 42 is relocated.

FIGS. 7 a to 7d show the use of a working apparatus in accordance with a particular embodiment of the present invention when sealing a bed area 22 under water 24. Four hollow pipes 46, 48, 50 and 52 of the working apparatus can be seen. To the right of the hollow pipes, a sealing layer 54, a filter layer 56, a filter layer 58 and a protective layer 60 of water engineering stones are deposited one on top of the other, from bottom to top. In FIG. 7b, a corresponding layer arrangement is now created by pouring corresponding materials into the hollow pipe 52. In FIG. 7c, the hollow pipe 52 is pulled out upwards, so that continuous layers 54 to 60 form quite quickly. The hollow pipe 52 is now placed to the left of the hollow pipe 46 and then joined to it in the way described in connection with the FIGS. 2a to 2d (see FIG. 7d).

Finally, FIG. 8 shows a process for removing silt on the bed area 22 under water 24, for example in a canal. In the canal concerned, a working apparatus 62 in accordance with a particular embodiment of the present invention is arranged on the bed area 22. That working apparatus has a working platform 64, which protrudes from the water 24. Moving on the working platform 64 is a working machine 66, namely an excavator, with claw brackets 68 on its superstructure 70 (see FIG. 9). This makes it possible to change the direction of travel of the working machine without damaging the upper ends of the hollow pipes forming the working platform 64, as shown in FIGS. 2a to 2d for example. As can be seen from Figure, the silt 72 has already been removed on the left of the working apparatus 62. It is transported away in a barge 74. The silt is removed by dredging in the hollow pipes of the working platform 64 on the side 78 facing away from the side 76 towards which the water is flowing. After the silt has been removed, the hollow pipes are once again relocated to the side 76 towards which the water is flowing.

The features of the invention disclosed in the present description, in the drawings and in the claims can be essential to implementing the invention in its various embodiments both individually and in any combinations.

Claims

1. A working apparatus (62) for processing, especially sealing, underwater (24) bed areas (22), especially beds and banks (40) of waterways, especially canals, comprising a plurality of polygonal hollow pipes (10, 12, 32, 34, 38) arranged in parallel side by side and at least substantially without gaps, the upper ends of which form a horizontal, at least substantially flat working platform (26), wherein each hollow pipe has on its outer wall at least one projection extending substantially horizontally (14) with a flange (16) disposed on its outer end and extending vertically and at least one corresponding flange insertion aperture (18) with a slot (20) immediately above it which runs vertically and extends as far as the upper end of the hollow pipe (10, 12), the flange insertion aperture (18) being disposed further away from the upper end of the hollow pipe (10, 12) than the projection (14) with the flange (16) and being of greater horizontal dimensions than the slot (20), and wherein neighbouring hollow pipes (10, 12) are in engagement with one another via a respective projection (14) on one of the hollow pipes (10, 12) with a corresponding slot (20) in the other of the hollow pipes (10, 12), such that the hollow pipes (10, 12) cannot be moved relative to one another in the horizontal direction and only at the outer edge of the working platform (26) can at least one hollow pipe be pulled out individually in the vertically upward direction.

2. The working apparatus (62) of claim 1, characterised in that the hollow pipes (10, 12, 32, 34, 38) are made of metal, a metal alloy or plastic.

3. The working apparatus (62) of claim 1, characterised in that the hollow pipes (10, 12) are identical in the shapes of their cross-sections.

4. The working apparatus (62) of claim 1, characterised in that the hollow pipes (10, 12, 32, 34, 38) are different in the shapes of their cross-sections.

5. The working apparatus (62) of claim 1, characterised in that at least part of the hollow pipes (10, 12) is hexagonal.

6. The working apparatus (62) of claim 1, characterised in that the at least one projection (14) and the at least one flange insertion aperture (18) per hollow pipe are disposed on opposite sides (78) of the hollow pipe (10, 12).

7. The working apparatus (62) of claim 1, characterised in that the projection (14) is designed to be substantially tapering, preferably in a wedge shape, from the flange (16) to the associated hollow pipe.

8. The working apparatus (62) as claimed in claim 1, characterised in that the projection (14) is designed to be substantially tapering, preferably in a wedge shape, in the vertically upward direction.

9. The working apparatus (62) of claim 1, characterised in that each hollow pipe with its two projections is provided with a flange (16) and two corresponding flange insertion apertures (18) with a slot (20).

10. A process for setting up a working apparatus (62) on an underwater (24) bed area (22), especially beds and banks (40) of waterways, especially canals, characterised in that it comprises: (a) lowering a first hollow pipe (10) onto the bed area (22) under water (24);(b) lowering a second hollow pipe (12) next to the first hollow pipe until the or a flange insertion aperture (18) of the second hollow pipe (12) is on the same level as the or a flange (16) of the first hollow pipe (10);(c) thrusting the flange insertion aperture (18) of the second hollow pipe (12) onto the flange (16) of the first hollow pipe (10); and(d) lowering the second hollow pipe (12) onto the bed area (22) under water (24); and(e) repeating steps (b)-(d) analogously with further hollow pipes to set up the working platform (26).

11. The process as claimed in claim 10, characterised in that at least two bulkheads (42, 44) are attached to the side of the working platform (26).

12. The process as claimed in claim 11, characterised in that the bulkheads (42, 44) are suspended in the hollow pipes and are sunk into the bottom of the bank (41).

13. A process for moving a working apparatus (62) as claimed in claim 1, characterised in that the last row of hollow pipes in the direction of movement can be pulled out upwards, one after the other, and lowered again at the front end of the working platform (26) in the direction of movement, until the or a flange insertion aperture (18) of the lowered hollow pipe is on the same level as the or a flange (16) of a neighbouring hollow pipe, the flange insertion aperture (18) of the lowered hollow pipe is thrust onto the flange (16) of the neighbouring hollow pipe and subsequently the hollow pipe is lowered onto the underwater (24) bed area (22) and this procedure is repeated once or a number of times as required for what then becomes the last row of hollow pipes in the direction of movement.

14. A process for sealing bed areas (22) under water (24), especially beds and banks (40) of waterways, especially canals, using a working apparatus (62) as claimed in claim 1, characterised in that it comprises: (a) setting up the working apparatus (62) in accordance said process;(b) pouring a self-sealing, pourable sealing material to create a sealing layer (54) into a hollow pipe (52) which can be pulled out upwards individually and is located at the outer edge of the working platform (26);(c) pouring a protective material into the hollow pipe (52) to create at least one protective layer (60) on the sealing layer (54);(d) pulling the hollow pipe (52) upwards out of the working platform (26);(e) lowering the hollow pipe (52) in a different, preferably opposite, area of the outer edge of the working platform (26), until the or a flange insertion aperture (18) of the hollow pipe (52) is on the same level as the or a flange (16) of a neighbouring hollow pipe (48);(f) thrusting the flange insertion aperture (18) of the second hollow pipe (52) onto the flange (16) of the first hollow pipe (48);(g) lowering the hollow pipe (52) onto the bed area (22) under water (24); and(h) repeating steps (b)-(g) for at least one further hollow pipe which can be pulled out upwards individually.

15. The process as claimed in claim 14, characterised in that the sealing material comprises a plurality of three-dimensional, preferably disk-shaped or platey bodies, each of which consists of an homogenised blend of clayey soil mixture and at least one swellable material which swells upon contact with water (24).

16. The process as claimed in claim 14, characterised in that the sealing material comprises processed soil mixture mixed with at least at least one swellable material which swells upon contact with water (24).

17. The process of claim 14, characterised in that the at least one swellable material is bentonite powder, bentonite beads or bentonite pellets.

18. The process of claim 14, characterised in that the or at least one protective layer (60) is a filter layer (56, 58) or a layer of water engineering stones.

19. The process of claim 14, characterised in that in step (b), a separating material, preferably prepared from clay chips, is poured into the hollow pipe directly onto the sealing layer (54) in order to create a separating layer.

20. The process as claimed in claim 14, characterised in that in step (b), before the sealing material is poured in, a separating material, preferably prepared from clay chips, is poured into the hollow pipe, optionally onto a subgrade, in order to create a separating layer.

21. A process for extensively incorporating minerals, mixtures of minerals or minerals consolidated with binders on a bed area (22) under water (24), especially beds and banks (40) of waterways, especially canals, using a working apparatus (62) as claimed in claim 1, characterised in that it comprises: (a) setting up the working apparatus (62) in accordance with said process;(b) pouring at least one mineral, a mixture of minerals or minerals consolidated with binders to create a corresponding layer in a hollow pipe which is located at the outer edge of the working platform (26) and can be pulled out upwards individually;(c) pulling the hollow pipe upwards out of the working platform (26);(d) lowering the hollow pipe in a different area of the outer edge of the working platform (26) until the or a flange insertion aperture (18) of the hollow pipe is on the same level as the or a flange (16) of a neighbouring hollow pipe;(e) thrusting the flange insertion aperture (18) of the lowered hollow pipe onto the flange (16) of the neighbouring hollow pipe (48);(f) lowering the hollow pipe onto the bed area (22) under water (24); and(g) repeating steps (b)-(e) for at least one further hollow pipe which can be pulled out upwards individually.

22. A process for removing silt from bed areas (22) under water (24), especially beds and banks (40) of waterways, especially canals, using a working apparatus (62) as claimed in claim 1, characterised in that it comprises: (a) setting up the working apparatus (62) in accordance with said process;(b) removing silt (72) from a hollow pipe which can be pulled out upwards individually and which is located on the outer edge of the working platform (26) opposite the side (76) towards which the water is flowing;(c) pulling the hollow pipe upwards out of the working platform (26);(d) lowering the hollow pipe at the outer edge of the working platform (26) on the side (76) towards which the water is flowing, until the or a flange insertion aperture (18) of the hollow pipe is on the same level as the or a flange (16) of a neighbouring hollow pipe;(e) thrusting the flange insertion aperture (18) of the lowered hollow pipe onto the flange (16) of the neighbouring hollow pipe (48);(f) lowering the hollow pipe onto the bed area (22) under water (24); and(g) repeating steps (c)-(f) for at least one further hollow pipe which can be pulled out upwards individually.

23. A process for dredging waterways and bodies of water, especially in the tidal region, using a working apparatus (62) as claimed in claim 1, characterised in that it comprises: (a) setting up the working apparatus (62) in accordance with said process;(b) dredging material out of a hollow pipe which can be pulled out upwards individually;(c) pulling the hollow pipe upwards out of the working platform (26);(d) lowering the hollow pipe in a different area of the outer edge of the working platform (26);(e) thrusting the flange insertion aperture (18) of the lowered hollow pipe onto the flange (16) of the neighbouring hollow pipe (48);(f) lowering the hollow pipe onto the bed area (22) under water (24); and(g) repeating steps (b)-(e) for at least one further hollow pipe which can be pulled out upwards individually.

24. A process for creating dams in waterways and bodies of water, using the working apparatus (62) as claimed in claim 1, characterised in that it comprises: (a) setting up the working apparatus (62) in accordance with said process;(b) pouring a dam building material into a hollow pipe which can be pulled out upwards individually and is located at the outer edge of the working platform (26);(c) pulling the hollow pipe upwards out of the working platform (26);(d) lowering the hollow pipe in an opposite area of the outer edge of the working platform (26) until the or a flange insertion aperture (18) of the hollow pipe is on the same level as the or a flange (16) of a neighbouring hollow pipe;(e) thrusting the flange insertion aperture (18) of the lowered hollow pipe onto the flange (16) of the neighbouring hollow pipe;(f) lowering the hollow pipe onto the bed area (22) under water (24); and(g) repeating steps (c)-(f) for at least one further hollow pipe which can be pulled out upwards individually.

25. A working machine (66) driving on a working platform (26; 64) of a working apparatus (62) as claimed in claim 1, comprising an undercarriage and a superstructure (70), the undercarriage having tracked running gear and the superstructure (70) being provided with claw brackets (68) which are designed such that they make it possible to turn the undercarriage in order to change the direction of travel of the working apparatus (66).

26. The working machine (66) as claimed in claim 25, characterised in that it is an excavator.