DE2359540A1 - UNDERWATER FUNDABLE EQUIPMENT AND PROCEDURE FOR ESTABLISHING IT ON THE SEA FLOOR - Google Patents

Description

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1 / stä - 7465/7555/7557/7540 Munich-Pullach *, November 29th, 1973

ι REDPATH DORMAN LONG (CONTRACTING) LIMITED _t Elliott House,; Hillside Crescent, Edinburgh + Scotland, UK

■ üntei · - water on the seabed fundable-facility and Procedure for their establishment

: The invention relates to an underwater on the ocean floor Establishable institution and procedure for its establishment *

It is known - to make platforms, the foundation of which is under water, such platforms have a foundation lying undisturbed on the seabed, from which a tower-like structure extends upwards, as well as a work desk and / or a superstructure on top of the Tower structure supported above the water surface

The foundation or foundation can be formed ^ by Poles are drifted into the bottom of the sea * In this process is. however, a considerable expenditure of time and effort Building site required ^ and it can happen that in stormy conditions Weather the work has to be interrupted.

To avoid that piles ■ must be driven, it has been proposed ^ the Fundierurigen stability "is based * These platforms can be considered" part of its own weight hei through platforms herzustelleni Where kraftbauten heavy ■ ^'1 * denotes a difficulty which what can be expected in such structures with heavy forces is that

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such components after. Completion are difficult to drag to the intended building site, and that they are comparatively sensitive to bad weather.

The present invention is concerned with an underwater one A device that can be found on the seabed, which is produced by first flowing a foundation onto the under Water lying bottom is lowered, and then an upright one Tower construction is attached to this raft and the tower structure can be towed separately to the construction site and are established one after the other for comparatively short periods of time in good weather «Then the deck or the superstructure added above the water level to complete the platform.

The expression "facility that can be found on the seabed" denotes a facility that is located in a lake »sea, one of the Tidal estuary or any other body of water stands or is intended to stand without being structurally connected to the land connected, with the exception of the subsoil under water below the surface of the water, whereby the expression is simultaneously the combination of a foundation raft and a tower structure includes.

The invention provides a device that can be founded on the ground created for arrangement on a submerged subsoil, which consists of a foundation raft, which is on the subsoil can be anchored, and there is a tower structure that protrudes upwards on this after the foundation, either the Foundation raft or the tower structure one socket part and the other of the two parts to a corresponding pin part. A- ' has handle with the socket part. ;

In a preferred embodiment of the invention are one; directions provided to a space between the pin part I and to empty the socket part, whereby the external hydrostatic pressure keeps these parts in engagement with one another and so ι

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holds the tower structure in its position on the foundation raft

In a preferred embodiment, a seal is carried on a shoulder surrounding the pin to engage the material surrounding the rim of the socket. gene.

According to an advantageous embodiment of the invention, the space mentioned can be emptied of water, and Einriehr- ■ are provided to inject cement into the space.

Preferably a hollow tubular member in the tower is built construction, which with a leadership in said ^space: Governing stent valve in communication.

According to an advantageous development of the invention, the carries . Tower construction the spigot part, and the socket is in the foundation raft built-in.

According to an advantageous development of the invention the foundation raft and the tower structure waves on which each other align when the pin and the socket; engaged with—; stand one against the other in order to create a continuous wave fen, which, from the area, the water surface in the under , Water-lying subsoil beneath the foundation raft stretches. : -

According to another advantageous development of the invention the tower structure has internal cavities around the tower structure for towing to a position above the anchored foundation raft To make towable, these cavities optionally are floodable in order to thereby ballast the tower structure provided so that they are essentially vertical Main axis can be sunk. "

According to a preferred embodiment of the invention is a Semi-submersible provided, which on the

Foundation raft can be arranged, the foundation raft optionally floodable, and with the Halb submersible facilities has to lower the partially flooded foundation raft to the sea floor.

Preferably, the semi-submersible has float feet, which extend from an upper level to a lower level, whereby the semi-submersible during the lowering of the foundation raft floats on a small area of the water surface.

In an advantageous manner are on the base of the foundation raft three units are provided, each of which has two perpendicularly spaced chambers, and they are devices provided to drain sand or the like from the lower of the chambers, whereby the foundation raft towards the sea bed can be lowered with displacement of the sand or the like.

It is further preferred that each unit has a plate, which is arranged at the foot of the lower chamber and which rests on the sea bed, this plate via cables with the Unit is connected and is slidable within the lower chamber.

It is also preferred that the units themselves are designed to be movable as pistons in cylinders, which are located on the base of the foundation or form part of it, and the height of the pistons can be adjusted by moving Sand can be adjusted from the aforementioned cylinders. j

Preferably the pistons are suspended in the cylinders in order to; to avoid that they fall out of these.

The invention also provides a method for establishing, created a facility that can be found on the seabed, ' in which a foundation raft on a submerged building

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ground is founded, a tower structure is lowered onto the foundation raft and is submerged, with pin and socket parts being brought into engagement with one another on the foundation raft and the tower structure to attach the tower structure to the raft.

In this procedure, it is preferred that the tower structure on the foundation raft emptied by means of a sealed of water Space between the foundation raft and the tower structure will hold.

Further, it is preferred that the tower structure in the direction of Fun ~ damentfloßes is guided by means of cables which on the foundations ^■: ment flowed run by guide rollers or blocks on the tower structure.

• According to a preferred embodiment, a half-diving boat (semi-submersible) arranged on the foundation raft, the foundation

; ment raft and the Halb submersible to a construction site moved, the foundation raft at least partially filled with water, the foundation raft to the seabed by means of support elements lowered, which, directed downwards on the semi-submersible are suspended, the foundation raft attached to the seabed and the semi-submersible away.

j It is preferred that three units on the basis of the Funda— ι ment rafts are arranged, of which each unit is two in ! perpendicularly spaced chambers, wherein the un- , tere chamber is separated from the seabed, whereupon sand or the like is moved out of the .unteren chamber to thereby lower the foundation raft towards the seabed, ". ,,,

Preferably, the units themselves before the foundation of the Foundation raft is moved in the vertical direction from the foundation raft in cylinders down, which are arranged on the foundation raft are or form part of the same.

According to a preferred development of the invention, the loading

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movement of the units in the cylinders carried out to raft the foundation after, the specified procedure steps horizontally align.

In the following, the invention is based on two specific in the drawings "exemplarily illustrated embodiments explained in more detail. It shows:

Figures 1 to 5 successive stages in the foundation

and assembling a first embodiment of the device according to the invention;

Figure 6 is a view of a foundation raft (for

another embodiment of a sea platform) in a dry dock;

Figure 7 the foundation flowed in a floating state,

with a HaIb-T auchboot arranged on it \

Figure 8a shows the foundation raft and the semi-submersible

Lake;

FIG. 8 b shows the swimming stability of this combination;

Figure 9 the lowering of the foundation raft on the

■ seabed;

Figure 10 a and 10 b the foundation of the foundation raft on Ge |

sliding clay or sand, which the sea- j

ι · ι

j. form green. :

Figure 11a and 11b show the underfilling of the foundation raft in the ί

Mounting position; !

■ Figure 12 the foundation raft in the waiting position for

j the tower structure;

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Figure 13 »Ϊ4. and 15 steps "when building the tower structure;

Figure 16 the abge on floating bodies or pontoons

supported tower construction; .

Figure 17 the tower structure itself with the help of a

Sehwimmer raft swimming;

Figure 18 shows the alignment of the 3harm structure on the

Foundation raft;

Figure 19 the pulling of the tower structure into his

Installation position on the foundation raft; and

FIG. 20 shows the finished sea gravity platform;

Figure 21 ■ a middle section of the new feet of the

Sea platform; and .

Figures 22, 23 and 24 successive stages in lowering the foundation raft.

In the manufacture of marine platforms, for example from offshore platforms involved in the extraction. from Hydrocarbons are used, it is preferred that so As little work as possible needs to be done at sea. This is especially ! Special ^ the case when the building site is deeply watered. The illustrated embodiments according to of the present invention have been made with this in mind Considerations designed.

In Figure 5, a platform 10 (in this embodiment a drilling platform for oil drilling - off the coast) in one illustrates well-founded ground 12 lying under water. the Platform exists. from a foundation raft or pillow I4, a Tower structure 16 and a superstructure 32. · ,.

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The caisson I4 consists of a reinforced concrete structure and has an upwardly open conical recess 18 (best from Figure 1) and a shaft 20 coaxial with the recess. The caisson is hollow and available in a number of options subdivided floodable watertight compartments (not shown).

The tower structure 16 can be made of steel or a steel, steel and concrete composite structure consist, which has a lower cylindrical portion 22, which in the illustrated example is circular in cross section and has a lower part 24 (Fig. 4) which is conical is to ensure a tight fit with the recess 18 of the caisson I4, which is open at the top. One above Spigot 25 on the tower structure engages a slot 26 in the side of recess 18 for proper angular orientation to ensure the tower structure with respect to the recess.

The main body of the tower structure 16 is internally divided into a number of watertight compartments 27 which can be optionally flooded are. These are used in the process of lowering and lowering the tower structure.

The upper end 28 of the tower structure is of a shafted type penetrable construction. This means that it presents to the waves a section consisting mainly of openings, so that the waves can travel around and through the structure instead of hitting it hard. The stresses the structure are thereby reduced. In the case of the fill-in shown, s form. 3 nt the upper part 28 of the tower structure as a framework educated.

A watertight central shaft or tube 29 extends through the total length of the tower structure along its longitudinal axis. These Shaft is in communication with shaft 20 in caisson 14 and thus forms a waterproof wave, which is a direct

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Access to the underwater ground 12 from above the Water level provides «. .

A superstructure 32 is on top of the shaft penetrable section 28 above: arranged above the water level. The superstructure • takes the necessary equipment and plant components. Oil drilling on s ■ '■

The procedure * by means of which the platform on the underwater lying ground is built, is now-in the following explained in more detail * ......

First under. Based on Figure I, the caisson 1.4> the inner compartments are empty (although in this state it is buoyant). Building site dragged> with a HaIb-I ¹ auchboob 34 on its lower surface, which is equipped with powered winches. Cable 36 From the winches are attached to the top of the caisson 14 * -

When arriving at the building site, the inner parts of the Filament raft is flooded so that it is in a horizontal position ii would sink b ,. The Halb submersible 34 floats while the caisson .14 sinks, and sbeiiert that. Sinking of the caisson by means of the cables 36.. = ·.

When the caisson has reached the building ground beneath the wandering ground, it is founded in the subsoil (.1, ¹ Ig, 2). or, with the method described in the British patent application 't \\ 9 \ /' l \ (German patent application P 22 05 7ö4 * 1) * to which we refer for further details »In short,". "exists - this method exists in that a remote-controlled digging vehicle with positive buoyancy is used, operated by the semi-submersible 34, which drives down through the shaft 20 of the caisson, 14 and then moves onto the area below the caisson , moving j digs the building ground. This area below is sufficient

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chend flat to allow the vehicle to stand on Wheels or tracks moved around on its roof. The excavated material is under the. Caisson 14 conveyed out through suction pipes. As the material is excavated and removed, leaving a cavity 40, the caisson 14 slowly sinks, until it is sufficiently deep in the subsoil below Warsser Is anchored. The cavity 40 can then be backfilled, and the vehicle is finally moved back up via the shaft. The cables 36 are then expedient with buoys provided to later when inserting the tower section 22 to be used in the recess 18 of the caisson.

The section 22 is dragged to the construction site in a buoyant manner and in a horizontal position in a stable position. Upon arrival at the construction site, the Abbe L ie 27 of the tower structure are successively flooded one after the other, starting with the Abeil in the conical, formed section '2.A- until the tower structure assumes a vertical position. Winches are installed on top of section 22. The cables 36, which are already connected to the caisson 14, are passed through guide rollers 42 on the lower part of the tower structure and then to the winches 41. Another controlled flooding of the 'L'urmauf building is now carried out, so that this Langsani sinks in the caisson's calibration. The guide cables 36 are hauled in by the winches 41 in order to thus arrange the conical section 24 of the tower structure exactly above the recess 18. The sinking of the tower structure continues, and finally it comes to rest in firm engagement with the recess Io (FLg, 5 ). The correct angular alignment of the tower structure is achieved initially by means of the infill cables 36 and finally by means of the pin 25 and the recess 26.

As an alternative to the winches 41, the cables 36 can run through the Guide rollers 42 for winches on tow steamers (not shown) be guided.

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The rigidity and rigidity of the connection between the conical formed section 24 of the tower structure and the recess 18 is improved, if necessary, by pressure injection of cement is made to make up any voids to fill between these two parts.

The middle shaft 20, 29 is at least partially water emptied so that the water pressure under the caisson 14 is reduced will. Thereupon the external water pressure additionally improves the stability of the structure, and this pressure can be used to prevent later discontinuation by removing the The subsoil lying under water is pre-compacted under the structure before the structure is handed over to its final purpose will.

Ultimately, the superstructure 32 is towed to the construction site and pulled with winches on top of the facility consisting of the tower structure and the foundation raft. This can be, for example done in the manner described in British Patent Application No. 5609/72, with reference to this for further details.

The remaining figures of the drawing and the following description deal with a second embodiment of the invention, which represents a further development of the first embodiment, which by means of the same basic process steps, as they are just described, is substantiated.

Figure 6 shows how a submersible foundation raft 101 is set up in a dry dock. If necessary, a soft apron or a more rigid but downwardly hinged apron can be clamped around the lower edge of the foundation raft before it leaves the dry dock. Figure 7 shows the foundation raft in a floating state, which has a draft of about 8 meters. The bottom portion of the raft is preferably left out of the dry dock of stack when the bottom plate 40 and the walls fo completed

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j, so that it is only about half the depth. That ; The foundation raft is then completed in a floating state. Temporary supports 102 can be formed integrally with the foundation raft or on the surface below of the bottom section can be attached if it swims in sufficiently deep water. Should be planned, the foundation raft If it is to be based on bedded concrete or stone, the soft apron 103 can be weighted down with sand or concrete.

A semi-submersible specially trained for this purpose can be set up on top of the foundation raft. This HaIb submersible has a flat deck and a number of hollow pillars 110 which lead down to its base.

Figures 8 a and 8 b illustrate the swimming stability of the foundation raft and the semi-submersible when towing in rough seas. Provided that the Halb submersible is safe with you the foundation raft is trusted, this combination is stable and structurally safe under all sea conditions

Figure 9 shows the foundation of the foundation raft on the army base. A compressor 105 and a pump 106 (exemplary of a variety of such compressors and pumps) are on the Deck of the semi-submersible provided to the buoyancy and the buoyancy and the internal air pressure of the foundation raft to control during the operation of sinking. The compressor and the pump are on via lines 105 a and 106 a the foundation raft connected. Power driven winches 107 are also provided to allow fine adjustment of the lowering to enable, and are connected to the foundation raft by lines or cables 107 a. The Halb-T auchbo ot 104 is designed in such a way that that it takes up a small area of water when it is appropriately ballasted so that the in the forces occurring during lowering are comparatively independent of wave movements.

Figures 10 a and 10 b show the foundation raft on the sea

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resgrund. Ώα "case of Figure 10a, the reason consists of. Extreme hard rubble concrete with large headstones, and consequently there is no risk of underwatering or settling, and consequently, the skirts 103 are filled with sand or concrete to protect the underfill under the foundation raft. Three Temporary support columns 102 can be used to align the foundation raft in a horizontal state when operated as reciprocating pistons working with sand. As illustrated in FIG. 11 a, concrete or sand is then used along a central pipe into the space under the foundation raft let in to fill the gap between the sea bed and the foundation raft au, and then the foundation raft are even partially burdened with sand as ballast, for example in the case when the raft is later for storage of oil to be used. The displaced sea water occurs through relief holes provided on the circumference. Optional can be a weak sand-cement mixture for cement injection be used. .

Figure 10b rests the foundation raft on a soft sea floor, and the material of the seabed is drawn off below the foundation raft by any convenient means. In this way the foundation raft can be in one in the Settle the seabed underneath the trained trough. As in figure 11b illustrates, the space under the foundation raft can be backfilled with sand, or the raft can go straight onto the excavated level can be lowered without a backfill is required. The foundation raft can then be completely flooded.

FIG. 12 shows the foundation raft in a well-founded state, with two floating buoys 109 indicating its position below the sea surface. : ..- _. ..- ..,. '. \

The construction of the tower structure for the platform is shown in the figures 13-15 illustrated. Four units 111 (each unit is illustrated as triple deep) become perpendicular

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Erected and supported by guide ropes 112 to horizontal tubular components in the completed tower structure to build. Four units 113 (each unit is three times deep illustrated) are welded into their installation position between the units 111, around pillars 131 in the finished tower structure and there will be a deck 114 parallel to the units 111 built. In Figure 15, the steel construction is completed after the installation of diagonals, after they have been tensioned to achieve the rigidity of the tower structure.

In FIG. 16, a completed tower structure, possibly weighing 10,000 tons, is on two floating bodies or pontoons 116 and 117 left from the stack and this tower structure can be towed to the construction site. The float 116 supports the tower structure via blocks 119, and between the float 117 and A floating raft 121 is arranged on the tower structure.

As illustrated in Figure 17, the Fontons or Floating bodies are sunk below the tower structure, whereupon the tower structure floats under the effect of its own buoyancy.

As illustrated in Figure 18, the buoyant raft can first raise the top of the tower structure, followed by Power driven winches 122 on deck 114 can be attached to cables 123 leading to buoys 109 in FIG 12 lead.

In Figure 19, the tower structure is immediately above the foundation ment raft 101 illustrates, and Figure 20 shows a unit, which from the tower structure, whose feet are firmly in the sockets in are anchored to the foundation raft, and this itself exists. In The superstructure (not shown) for the platform can be in this state by means of a crane 125 arranged on the deck 114 be raised into its position.

It can be seen that the construction of the foundation raft 101 and of the tower structure 118 as separate units Advantages in the

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Manufacturing offers. Furthermore, the foundation of the foundation ! mentfloßes at an early stage of the overall construction period that the tower structure can be adapted, if the prevailing on site The condition of the sea bed should have caused a change in the level of the foundation

The tower construction has eight outer feet 131 and a middle one Foot 132 on · The feet of the tower structure are with the foundation raft connected by connections 135, which will be described in more detail below · The distance between the seabed and the mean sea level can typically be 150 meters, and to enable the pressure under the foundation raft to respond to the differential pressures created by the Hindu roaring waves are generated below deck 114, deiMitteifüß I32 is hollow and shows one through it above leading water pipe. The aqueduct is to the Layers lying under the water under the foundation raft open and connected to flap valves I36 and 137, which are connected to the Metatarsus 132 below the lowest possible level of valleys are attached. The valves are arranged in such a way that if a wave trough passes the flap valves, the water can escape from the central column Typical embodiment are the flap valves I36 and 15 meters below sea level. In this way, a pressure built up under the filament raft can be reduced will"

As illustrated in Figure 20, the feet are stiffened against one another by struts 138 and around the platform as a whole to give additional stability and strength it may be expedient to fill parts of the feet 131 with concrete.

As can be seen from Figure 21, the base of the illustrated Foot 13I a pin I41 and a base plate 147, which is carried by straps I42 and 143. A cross member and diagonal struts 138 connect this foot to the others Feet. j

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The foundation raft 101 has a socket 145, and there is an annular space 146 between the socket 145 and the pin 141. A rubber gasket I48 is between the edge of the plate 147 (which forms a shoulder ") and the part of the foundation raft 101 which surrounds the sleeve 145, fitted.

It can be seen that each of the legs have a pin arrangement can, and that the foundation raft has a socket for each pin. Alternatively, tenons can be attached to the foundation raft be formed, and the sockets can extend up into the feet.

During construction, the pin 141 is placed under the tower structure in the Bushing 145 lowered when the tower structure is lowered onto the foundation raft. When the feet of the tower structure are firmly anchored in the foundation raft, the rubber seal supported by the shoulder provided on the edge gripped between the plate 147 and the overhead plate of the foundation raft and effectively seals the space under the Footplate against the external water pressure. The annulus can now be pumped out, and air at atmospheric pressure can be admitted into the room through a drain valve 149. In this way the pressure under plate 147 is compared with the sea water pressure on the overlying surface of the plate is significantly reduced, and the tower structure can with the foundation raft 101 can be kept in contact by the full external hydrostatic pressure on the footplate 147.

Then the space between the pin and the socket can be filled with cement by injection from inside the spigot, provided that between the tower structure and the foundation raft is provided with an additional connection under tension.

If the platform is to be dismantled again at a later point in time, the tower structure must be attached using bolts 150 attached to the foundation raft after the seal 148

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inserted and the socket 145 has been drained of water. For dismantling the platform can loosen the bolts 150 and the Feet can be removed from the tenons, which are attached to the existing Remain attached to the foundation raft.

In the following, details of the foundation of the in the figures 10 a and 11 a illustrated foundation flow in more detail described. '. ,

As illustrated in Figure 22, the foundation raft 101 is floating in the water. The foundation raft has generally horizontal upper ones and lower plates 212 and 212 A, respectively, and generally perpendicular Strut 214 between these plates.

In the area of the outer circumference of the raft are three cylinders 215 • Provided, each containing a piston 216 * For simplification the illustration, is only such a piston cylinder assembly shown. The piston 216 is hollow and has vertically spaced upper and lower chambers 217 and 218 respectively. At the bottom of chamber 218 is a generally horizontal one Plate 219 suspended from cables 221 is provided. The plate 219 closes the bottom of the lower chamber 218 and is movable in this in the vertical direction.

As illustrated in Figure 23, the piston 216, which " was previously fully retracted into the recess 215, according to lowered and is held in place by cable 222 * This is the Situation when the foundation raft has reached the intended place of foundation.

A mixture of sand and water is poured into the space above the Piston 216 and, at the same time, pumped into lower chamber 218. In this state, the fundamentals flow in the direction of the sea bed lowered.

Initially, the piston penetrates 2.16 a distance; a. in d-en, \ Bodendqs ocean floor «. This penetration can through. ·:

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appropriate loading of the foundation raft through. Ballast or effected by high pressure water jets under the lower plate 219 will.

If further penetration into the seabed is required this can be accomplished by removing sand from chamber 218 relocated to chamber 218 by high pressure water jets will. The walls of the piston penetrate the sea floor over the distance b according to the displaced amount of sand, with the plate 219 remaining at its original height or level.

By excavating under the foundation raft as a whole, and by relocating it of sand in the required manner from the chambers 218 in the chambers 217 (arrow X) it is possible to raft the foundation lower to a level where plate 219 rests against partition 220 and all of the sand out of the chamber 218 was removed.

The lowering can then be continued in that the sand is removed from the space 225 above the piston with water jets. When the room 225 is at the same height as the working space under the foundation raft has been reduced, the excavation can be canceled. If then another Sand is removed from space 225 by water jets, the foundation raft settles to a lower level.

All of those mentioned in the description and in the drawings recognizable technical details are important for the invention.

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Claims (1)

Claims; / 1.j device that can be found under water on the sea bed, ■ - ^ consisting of a foundation raft, which can be found on the bottom, and a tower structure which protrudes upwards from this after the foundation, characterized in that the foundation raft (14, 101) or the tower structure (165 »118) has a socket section (18, 145) and the other of the two parts has a corresponding pin section (24, 141) for engagement with the socket section. .. ^; . ■ 2. Device according to claim 1, idadureh.gekiziert that Facilities are provided to the space (.146) between the socket section (18, 145) and the pin section (24, 141) to empty in such a way that the outer hydrostatic Pressure keeps these sections in engagement with each other and such the tower structure (16, 111? T13 - 115) in the installation position the foundation raft (14, 101) holds. 3. Device according to claim 1 or 2, characterized in that that on a shoulder surrounding the pin section (I41) (147) a seal (148) is provided, which is ■ gripped with the one surrounding the edge of the socket section (145) Material arrives, 4. Device according to claim 2 or 3 »characterized in that that the space (146) can be emptied of water, and that one Means for injecting cement into the space (146) is provided is. 5. Device according to one or more of claims 2 to 4, characterized in that a hollow tubular component (131) provided in the tower structure (111, 113-115) is, which is connected to a valve (149), which leads to room (146). 409 8 23/087 6. Device according to one or more of the preceding claims, characterized in that the tower structure (16, 111, 113-115) has the pin portion (24, 141), and that the bushing (18, 145) is contained in the foundation raft (14, 101). 7. Device according to one or more of the preceding claims, characterized in that the foundation flow (14, 101) and the tower structure (16, 111, 113-115) waves (20 and 29) which are aligned with one another when the pin (24, 141) and. the socket (18, 145) are engaged with each other in such a way that a continuous one extends from the area of the water surface to the underwater area lying subsoil (12) under the foundation raft (14, 1o1) extending shaft (20, 29) is formed. 8. Device according to one or more of the preceding claims, characterized in that the tower structure (16, 111, 113-115) has internal cavities (27) for towing the tower structure (16, 111, 113-115) into position over the well-founded pounding raft (14, 101) to be swimmable make, and in that the cavities (27) are optionally floodable, in such a way that the tower structure (16, 111, 113-115) is resilient to sink with its axis substantially perpendicular. 9. Device according to one or more of the preceding claims, characterized in that a semi-submersible (34, 104) which raft on the foundation (14, 101) can be arranged, it is provided that the The foundation raft (14, 101) can be flooded in a controllable manner, and that the semi-submersible boat (34, 104) has devices (107) for lowering the partially flooded foundation raft (14, 101) onto the ^: Has seabed, j j ■! '10. Device according to claim 9, characterized in that ' the semi-submersible (34, 104) has webbed feet (110), 409823/0874 " ^ΖΛ " '. . 235954Ö which look from an upper level to a lower level extend in such a way that the half submersible during the descent of the foundation raft, (14, 101) floats on a small surface of water », 11. Device according to one or more of the preceding claims, characterized in that at the base (212 a) of the foundation rafts (.101) three units (102) are provided are, the two vertically spaced chambers (217, 218}, lind that facilities-provided are to remove sand or the like from the lower chamber (218) lead out in such a way that the foundation raft (10t) in Direction of the seabed (12) by the displacement of the Sand or the like can be lowered. 12. Device according to claim 11, characterized in that each unit (102) has a plate (219) arranged at the foot of the lower chamber (2i8) for contact with the sea bed (12) having the plate (219) with the unit (102) over Cable (221) connected and inside the lower chamber (218) is slidable. 13. Device according to claim 11 or 12, characterized in that that the units (102) themselves are slidable as pistons (216) in cylinders (215) which are attached to the base (212 a) of the foundation raft (101) are attached or form part of the base, and that the height of the pistons (216) by Movement of sand from the cylinders (215) is adjustable. 14. Device according to claim 13, characterized in that the pistons (216) are suspended in the cylinders (215) by means (222) to prevent them from falling out. "- ■ -" ■ - 15. Procedure - establishing .one on the ocean floor underwater fundable institution in which a. Foundation raft founded on a submerged ground and a 409823/0874 Tower structure is lowered onto the foundation raft, thereby characterized in that pin and socket portions on the foundation raft and the tower structure are brought into engagement with one another to attach the tower structure to the raft. 16. The method according to claim 15, characterized in that the Tower construction on the foundation raft by means of a sealed, water-emptied space between the foundation raft and the tower structure is held, 17. The method according to claim 15 or 16, characterized in that that the tower structure in the direction of the foundation raft means Cables is guided, which are guided from the foundation raft through guide rollers to the tower structure. 18. The method according to one or more of claims 15 to 17, characterized in that a half-submersible (semi-submersible) is arranged on the foundation raft that the foundation raft and the Halb submersible floating to one Construction site are towed that the foundation raft is at least partially filled with water, the foundation raft on the Sea floor by means of holding elements that are attached to the semi-submersible are suspended, lowered, and that the foundation raft is attached to the seabed and the semi-submersible Will get removed. 19 · method according to one or more of claims 15 to 18, characterized in that three units are placed at the base of the foundation raft, each unit of which has two vertically spaced chambers, the lower of the chambers being separated from the seabed is, and that sand or the like from the lower chamber is removed to thereby move the foundation raft in the direction of the Lower the seabed. 20. The method according to claim 19 »characterized in that another movement of the units in the cylinders by— 409823/0874 is led to d'as foundation raft according to the specified Align procedural steps horizontally. 21. The method according to claim 19 or 20, characterized in that that a further movement of the units in the cylinders is carried out to raft the foundation according to the specified Align the traversing steps horizontally. 22. Connection for an underwater on the: seabed fundable Device, characterized in that pin and socket sections (24, 141 or T &, 145) are provided of which a part with a foundation raft (14, 101) and the other part with a tower structure (16, 111, 113 - 115) is connected that with t el (148) for sealing the circumference of the space (146) between the pin section (24, 141) and the base section (18, 145) at or near the Root of the pin (24, 141) are provided, and that means (131, 149) for emptying the inside of the pin section (24 »141) or the socket section (18, 145) to the atmosphere through the tower structure (16, 111, 113 - 115.) are provided. 23. Connection for installation in an underwater on the seabed fundable facility, characterized that pin sections (24, 141) and socket sections (18, 145) are provided, one of which with a foundation raft (14, 101) connectable and ^ the other with a 'tower up' bau ^ (i6, 1T1, 113-115) is connectable that means (I48) for sealing the perimeter of a space (146) between the Pin section (24, 141) and the socket section (18, 145) are provided at or near the root of the tenon section (24, 141), and that means (131, 149) for Vent the inside of the journal section (24, I4I) or of the socket section (18, 145) for the tower structure (16, 111, 113-115) are provided, 24. Arrangement at the base of an underwater on the sea. 409823/0874 grand fundable device, characterized in that a piston (216) with two perpendicularly spaced chambers (217 »218) and devices are provided are to guide sand or the like from the lower chamber (218) into the upper chamber (217), whereby the Arrangement (102) can be lowered in the direction of the sea bed (12) by displacing the sand or the like. 25. Method of foundation an underwater on the ocean floor Foundable device, characterized in that a piston is arranged at the base of the device, wherein the piston has two vertically spaced chambers, the lower chamber of which is from the sea floor is separate that the device is lowered to the seabed resting on the piston, and that sand or the like is moved from the lower chamber into the upper chamber to move the device towards the seabed lower. j 26. Under water on the seabed fundable device, characterized in that a foundation raft (14, 101), which can be found in the base (12) and has at least one recess (18, 145) that is open at the top is, and that a tower section (24, 141) which fits into the at least one recess (18, 145) is provided, if the foundation raft. (14, 101) was founded, and the extends upward from this in the direction of or through the water surface. 27. A method for arranging a device that can be found underwater on the seabed on the underwater bed, thereby characterized in that a foundation raft forming part of the device is anchored in the bed, wherein the foundation raft has at least one recess open at the top, and that a tower section on the foundation Mentfloss is lowered, wherein the tower section fits into the at least one recess. 409823/0874 28, platform with a facility that can be found on the seabed naoh .. one or more of the preceding claims or produced according to the method according to one or more of the preceding claims » 4098237087Ä Lee rse i te