SU1015043A1 - Offshore platform erecting method - Google Patents

Abstract

METHOD OF INSTALLATION OF THE MORST OF THE PLATFORM, including the upper case, on the bottom of which are mounted supporting elements of the base with torsional joints, equipped with a trimming system, consisting in the eyeliner using the buoyancy of the upper hull to the base, drainage above it, the ballast into the trim system, lowering the hull on base and removal of buoyancy, which is due to the fact that, in order to simplify the installation technology and reduce its labor intensity, the centering jig mounted before it on the base body, whereupon reception of ballast buoyancy and trim the upper casing over the nose into contact with the bottom of a centering jig, and then the buoyancy of the stern, maintaining constant contact with the centering jig e bow of the hull to its landing on os1el Considerations. SP about 4:

Description

The invention relates to methods for the installation of offshore platforms intended for the development of the continental shelf, and can be used in shipbuilding.

There is a known method of assembling an offshore platform, through which a support part consisting of a foundation bed and several vertical columns of buoyancy cells is floated to the installation site. Additional sections of columns are delivered, which are attached to vertical columns protruding above the surface of the water. At the end of the assembly of columns on them establish a working platform. All lifting operations of the platform elements (their adjustment, holding on to the weight) are carried out with the help of a floating crane with a large load carrying capacity UlJ. Such a technical solution is not very suitable for the remote from the coast of raions of the sea, since the time to install each of these elements is so great that it is almost impossible to complete the operation in calm weather. In the presence of waves, wind, currents, installation in an open area is unsafe and very laborious.

There is also known a method of installing an offshore platform in an open area (which is less dangerous and allows speeding up the assembly process). Such a method consists in that a pre-installed supporting structure having protrusions, by means of a transport vessel equipped with a loading platform with a console and a trolley, is delivered to the platform. They rest the console of the cargo platform on the protrusions and, after such docking with the help of carts, roll the platform onto the supporting structure 2.

However, according to this method, it is difficult in marine conditions to dock consoles with protrusions and fix such a composition so that the platform, the weight of which currently ranges from 4.0 to 12-16 thousand tons, can be safely rolled.

In addition, transporting carts must be complex in design and provide the necessary strength, especially at the junction of consoles with protrusions, where it is impossible to ensure a smooth unstressed transition of the rollers of the trolley.

The closest technical solution to the proposed method is the installation of an offshore platform, including the upper hull, on the bottom of which the supporting elements of the base are installed with buoyancy, equipped with a trimming system, consisting in liner

the buoyancy of the upper hull to the base, centering over it, putting ballast into the trimming system, lowering the hull to the base and diverting the buoyancy lL3j. 5 According to this method, the platform installed at sea, i oTOpoe, somewhat rises above the level of calm measures, is guided by a platform transported on a specially equipped 10 vessel. On the base or on the platform, devices for compensating both horizontal and vertical vibrations are mounted in the process of connecting the platform with the base,

15 and braking device

platform in the process of its installation on the ground

The disadvantage of this method is that the special vessel.

0 being under the platform, when parts of the platform hang from its sides of a cd by significant removal, it is very difficult to ensure / sufficient stability during transportation, since

With the entire platform, the mass of the platform is significantly higher than the upper deck. In practice, for such a technical solution, the width of the vessel should be clearly greater than the width of the platform, but in this case the vessel is incorrectly difficult to enter into the base area so as to avoid heaps. Additional funds are required to provide stability and the possibility of docking the platform with the base.

5 buoyancy, and this greatly complicates the process of mounting the platform on the ground.

i These drawbacks complicate; mounting technology and enhance it

0 labor intensity.

The purpose of the invention is to simplify the installation technology and reduce its labor intensity,

The goal is achieved

5 additionally used

centering jib mounted before lowering the hull onto the base, after which the ballast is trimmed and the upper

 the body on the nose before contact of the bottom with the centering conductor, and then the buoyancy is trimmed to the stern, maintaining constant contact with the centering conductor of the forward part of the body before pushing it to the base.

 FIG. 1 shows the sea platform before the start of Montbika, general view; in fig. 2 is a view along arrow A in FIG. Ij in FIG. 3 — landing the entire body on the base f in FIG. 4 — moment

0 (contact with centering conductor.

The upper body 1 is made with parts 2 mounted on the bottom, support elements 3 of the base 4. Buoyancy 5 are connected with parts 2. On

5 base 4 fixed lower part

6 centering conductor, and on the housing 1 - the upper part 7. of this conductor. Housing 1 on buoyancy x 5 is installed with rfoMoutbra cells 8.

The method is carried out as follows.

By means of buoyancy 5, on which case 1 is fixed by means of cells 8, the latter is transported to base 4, passes over it, passes support elements 3 between buoyancy 5. By means of mooring devices mounted on base 4 and buoyancy 5, case 1 preliminarily positioned so that visually the upper part 7 of the conductor is approximately above its lower part 6. Then the buoyancy 5 with the ballast is trimmed to the side of the conductor until the upper part 7 comes into contact with the lower part 6. Continuing to take the ball The flippers trim the buoyancy 5 so that they gradually submerge into the water. Having a constant contact between parts B and 7 of the conductor, parts 2 descend in a strictly coordinated manner to the supporting elements 3 congruent to them. After parts 2 and 3 are joined, they are bonded, and buoyancy 5 and cells 8 are disconnected and retracted.

Hover and set operation

o hulls on the ground are performed in calm (calm) weather, within a few hours of a guaranteed forecast. As a result, there is no need to use a heavy floating crane, whose strength

5 is 61.0 million rubles. Accelerated commissioning of the facility. The laboriousness of the tests is reduced, since all systems, electrical and radio equipment can be tested under factory conditions.

Claims (2)

METHOD FOR MOUNTING A MARINE PLATFORM, including the upper hull, on the bottom of which are mounted support elements of the base with buoyancy equipped with trim system, which consists in connecting the buoyancy of the upper hull to the base, centering above it, accepting ballast into the trim system, lowering the hull onto the base and the removal of buoyancy, which consists in the fact that, in order to simplify the installation technology and reduce its complexity, an additional centering conductor is installed, mounted before lowering whiskers on the substrate, whereupon the ballast intake trim buoyancy and the upper casing over the nose into contact with the bottom of a centering jig, and then the buoyancy of the stern, while maintaining constant contact with the centering jig bow of the hull to its landing on the ground. στ ns Phil 1 buoyancy of the upper hull to the base, centering above it, accepted; ballast into the trim system, lowering the hull to the base and diverting buoyancy (3J. According to this method, on a base installed in the sea, which rises somewhat above the level of a calm measure, a platform transported on a specially equipped vessel I is induced. On the basis of the platform or the platform, compensation devices for both horizontal and vertical vibrations in the process of connecting the platform to the base are mounted, as well as a device for braking the platform during its installation on the base. The disadvantage of this method is that a special vessel located under the platform, when parts of the platform hang from its cd sides by a considerable distance, it is very difficult to ensure / sufficient stability during transportation, since the entire mass of the platform is much higher than the upper deck. In practice, for such a technical solution, the width of the vessel should be clearly greater than the width of the platform, but in this case, the vessel is incredibly difficult to enter the base area in such a way as to avoid a pile on it. To ensure stability and the possibility of docking the platform with the base, additional buoyancy means are necessary, and this greatly complicates the process of mounting the platform on the base. These disadvantages complicate; installation technology and increase its complexity. The purpose of the invention is to simplify the installation technology and reduce its complexity. This goal is achieved by the fact that they additionally use a centering conductor mounted. before lowering the hull to the base, after which buoyancy is differentiated by ballast and the upper hull on the nose until the bottom contacts the centering conductor, and then the buoys are differentiated on the stern, maintaining constant contact with the centering conductor of the bow of the hull before landing on the base. In FIG. 1 shows an offshore platform before installation, general view; in FIG. 2 is a view along arrow A in FIG. 1; in Fig.3 - landing of the entire housing on the base; figure 4 - moment (contact with the centering conductor. The upper body 1 is made with mounted on the bottom of the parts 2 of the supporting elements 3 of the base 4. Buoyancy 5 associated with parts _about 2. On the base 4 is fixed to the bottom