EP2258903A1 - Method and assembly for producing vibration sand piles on the beds of water bodies - Google Patents

Abstract

The method involves utilizing sand by bed (15) of waters and separating the sand from its fine grain portion. The sand is blocked in vibration sand piles (28) in the bed of water. The sand is separated from organic impurities during a washing process, where transport of the sand hydraulically takes place after the separation process. A sand lifting device (16) is provided for lifting the sand from the bed of waters. A sluice compactor (26) is provided for manufacturing sluice stone columns. A sand sender (24) is provided for transporting the sand up to a location of a sheeting. An independent claim is also included for a system for manufacturing vibration sand piles on a bed of water in offshore areas.

Description

The invention relates to a method for producing Rüttelstopfsäulen at the bottom of waters, especially in offshore areas, and a system for carrying out this method.

From the DE 25 43 320 A1 For example, there is known a method and a plant for the construction of a structure on the seabed, in which bulk material, in particular sand and gravel, is extracted from the seabed in the vicinity of the structure and subsequently conveyed to one or more foundation sites on the structure. In this case, the bulk material is classified before reaching the foundation sites and otherwise promoted near the seabed from one place of extraction to the one or more founding sites. As foundation bodies here only beds are provided.

From the DE 100 53 427 A1 a method and apparatus for producing columns of material in the soil of waters is known, in which in the soil to be introduced material such as concrete or gravel is introduced by means of a deep vibrator in the ground, the deep vibrator is attached to a Erdbaugerät on a pontoon floating on the water surface. The material must be introduced into a standing on the pontoon material reservoir, ie be brought to the pontoon with watercraft, which leads to a considerable cost and lead to other in stronger winds or heavy waves to obstructions or interruptions in the application of the method can.

On this basis, the present invention has the object to provide a method of the last-mentioned type, which is less expensive than known methods and offers increased application security regardless of the weather. The solution consists of a method for producing shaking pit columns at the bottom of waters, in particular in offshore areas, using sand from the bottom of the water body, separating the sand from its fine grain portion, and treating the treated sand in agitator columns at the bottom of the water body is installed. The proportion of fine particles is understood as meaning particle sizes smaller than or equal to 0.06 mm. Preferably, the sand is spent over the surface of the water for treatment.

Suitable material for the Rüttelstopfsäulen, especially sand is available in most offshore waters, so that the material itself is not a cost factor but solely its promotion. This is much cheaper in the form of pure suction from the seabed than the transport of sand by watercraft from land to place of column production.

The use of the suction device is also possible in weather conditions that would no longer allow the application of a watercraft to an offshore floating pontoon.

The separation according to the invention of the fine grain fraction from the sand to be built up ensures the necessary compactability for the production of the sand columns. The cost share for this is negligible.

In a preferred embodiment of the method, any organic contaminants which may be present are separated from the sand to be built up at the same time as the fine grain fraction, and this can be done in a uniform process. In this case, preference is given to using washing processes on vibrators or the like, if appropriate also sieving processes.

The separated from the sand to be installed shares can be returned in the vicinity of the sampling point, taking into account the flow conditions back into the water. When using the method near the shore, especially in rivers or canals, the separated shares can also be landfilled.

Once the sand to be built is provided in suitable quality, its onward transport to the place of manufacture of the columns may be made, preferably by hydraulic means, i. in a slurry with water, but possibly also by pneumatic means.

A plant according to the invention for producing agitator columns at the bottom of waters for carrying out the aforesaid process comprises a sand lifting device for lifting sand from the bottom of the water body, a sand treatment device for separating the sand at least from its fine grain fraction, to a sand transmitter for transporting the sand to the site the shoring and a sluice vibrator for producing the Rüttelstopfsäulen. Preferably, the lock vibrator is mounted on a drill pipe, at the upper end of the feed gate is arranged. However, it is also possible to connect the deep vibrator with the feed gate via flexible hose lines.

The lock vibrator with its suspension can be arranged on a separate vessel (pontoon) with greater mobility, while the remaining parts of the interlinked system namely suction dredger, sand treatment plant and sand transmitter on a second larger watercraft (pontoon), which is firmly anchored, be arranged could. But it is also a / the arrangement on a single vessel (pontoon) possible. The lock vibrator may be suspended from a crane or guided on a fixed frame.

For the preferred embodiments of the system components, reference is made to the claims.

• Figur 1 zeigt die verkettete Gesamtanlage für das erfindungsgemäße Verfahren in einem Vertikalschnitt;
• Figur 2 zeigt einen erfindungsgemäßen Schleusenrüttler als Einzelheit in einem Vertikalschnitt.

An embodiment of a system according to the invention is shown in the drawings and will be described below.

• FIG. 1 shows the linked overall system for the inventive method in a vertical section;
• FIG. 2 shows a Schleusenrüttler invention as a detail in a vertical section.

In FIG. 1 a chained overall system 11 according to the invention is shown, the interlinked plant parts are arranged on two watercraft 12, 13, both of which are floating on the water surface 14. The bottom of the water is designated 15. On the first vessel is a suction dredger 16, the suction pipe 17 extends to the bottom 15 of the water and sucks from this sand in the existing state. Said suction tube 17 may be flexible or telescopic in order to compensate for the depth of the base 15 which changes as a result of the suction. From the suction dredger 16, the sand mixed with water is conveyed hydraulically via a line 18 to a sand separating device 19, in which certain parts are separated from the sand, namely the fine grain fraction and optionally organic impurities. These are returned via a flushing pipe 20 at a distance from the sand removal point back into the water. At the sampling point a bottom well 21 can be seen, at the return point of the separation shares a landfill 22. The treated sand is transported hydraulically via a line 23 to a sand transmitter 24, which is essentially a pump assembly for the sand-water mixture. From this Sandsender 24 is supplied via a flexible line 25 which leads from the first floating vehicle 12 to the second floating vehicle 13, a lock vibrator 26, namely its lock chamber.

The lock vibrator 26 is lowered on a crane 27 attached, which stands on the second vessel 13. The type of guidance of the lock vibrator 26 shown hereby is advantageous in the case of stronger proper movements of the watercraft. Of the Water content of the hydraulically conveyed sand is separated in Schleusenrüttler 26 still in the region of the overhead lock chamber. Below the Schleusenrüttlers 26 an already partially completed Rüttelstopfsäule 28 can be seen, which arises when pulling up the Schleusenrüttlers 26 with the escape of sand after previously shaking the Schleusenrüttlers 26 without discharging sand. The pulling of the Schleusenrüttlers 26 is carried out according to the pilgrim-step method, wherein after a larger step of pulling each a smaller step of re-shaking takes place for compacting the discharged sand.

In FIG. 2 the lock vibrator is shown as an enlarged detail. Here, the supply line 25 at the upper end and a water outlet 29 can be seen, both of which are connected to an overhead feed chamber 30. On the dispensing chamber 30 has a first closure 31 at the upper end and a second closure 32 at the lower end. At the feed chamber 30 or lock chamber is followed by a pressure chamber 33 with a subsequent pressure tube 34 at. With the closure 31 open and the closure 32 closed, dehydrated sand can be introduced into the lock chamber 30 without pressure in the feed chamber 30. Thereafter, the shutter 31 is closed and pressure is applied to the pressure chamber 33 and the tube 34, so that a sufficient back pressure to the water pressure is built up when the lower shutter 32 is opened. Sand is then passed over the lower half pipe section 36 past the deep vibrator 37 to the lower outlet opening 38. The deep vibrator is attached via a flexible coupling 35 to a pipe string 39. It is driven in an electrically rotating manner by means of an internal motor, an unbalanced mass being mounted in the deep vibrator 37, which generates the vibrating movements of the sluice vibrator. At the upper end of the Schleusenrüttlers 26, a roller 40 can be seen, over which the support cable of the crane runs.

LIST OF REFERENCE NUMBERS

11

investment

12

water craft

13

water craft

14

water surface

15

reason

16

Saugheber

17

suction tube

18

management

19

Sand treatment device

20

flush pipe

21

floor trough

22

deposit

23

management

24

sand stations

25

management

26

bottom feed

27

crane

28

sand column

29

outlet pipe

30

lock chamber

31

lock

32

lock

33

pressure chamber

34

pressure pipe

35

clutch

36

half pipe

37

deep vibrator

38

outlet

39

extension tube

40

role

Claims (12)

Process for the manufacture of agitator columns at the bottom of waters, in particular in offshore areas,
characterized,
that sand from the bottom (15) of the water body is used,
that the sand is separated from its fine fraction, and
that the treated sand is then installed in Rüttelstopfsäulen (28) in the bottom of the water. Method according to claim 1,
characterized,
that the sand, in particular simultaneously with the fine grain content, is separated from organic impurities. Method according to one of claims 1 or 2,
characterized,
that the separated from the sand fractions of fine grain and optionally organic impurities away from the sand extraction point (21) are returned to the water or landfilled. Method according to one of claims 1 to 3,
characterized,
that the separation of the sand from fine grain fractions and organic impurities takes place in a washing process. Method according to one of claims 1 to 4,
characterized,
that the transport of the sand takes place after the separation process to the place of shoring hydraulically. Plant for the manufacture of agitator columns at the bottom of waters, in particular in offshore areas, comprising
a sand lifting device (16) for lifting sand from the bottom (15) of the water body,
a sand treatment device (19) for separating the sand at least from its fine grain fraction,
a sand transmitter (24) for further transport of the sand to the place of shoring and
a lock vibrator (26) for producing the Rüttelstopfsäulen (28). Plant according to claim 6,
characterized,
that the sand lifting device (16) is a suction device. Installation according to one of claims 6 or 7,
characterized,
that the sand treatment device (19) is a washing device and / or a screening device is. Installation according to one of claims 6 to 8,
characterized,
in that the sand transmitter (24) is a hydraulic conveying device. Plant according to one of claims 6 to 9,
characterized,
that the bottom feed (26) from a crane (27) or a fixed frame is guided. Installation according to one of claims 6 to 10,
characterized,
that the parts (16, 19, 24, 26) of the system are permanently linked. Installation according to one of claims 6 to 11,
characterized,
in that the parts (16, 19, 24, 27) of the installation are arranged on at least one watercraft (12, 13).

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