The method of installation of the marine jack-up platform

 

(57) Abstract:

The invention is intended for use in the field of hydraulic structures, in particular in the construction of offshore Jack-up platforms. In the method of installation of the marine Jack-up platform before mounting supports produce the reception of ballast in the tank outriggers platform, equal to the weight of the supports, and then gradually flood the lower compartments of support until it is brought into the vertical position in which it floats. Then, on a support having a rope from the mooring platform mechanism and pull her to Board the platform in the area of the outrigger, and after subsequent zastrocky support to the hook of the lifting means through the shaft tripping mechanism produce ballasting support to the zero buoyancy. Then continue ballasting to full flooding, while bearing will not hang on the hook of the lifting means whereby it may be tightened to the chassis platform. Then in the presence of currents additionally Ballesteros support before making its vertical position. After this column sucked into the shaft to engage with the tripping mechanism of the platform, and after leaving the top of the support from the water track roll and differ obespechenie marine installation fully assembled bearings with housing platform without the use of additional pontoons. 1 C.p. f-crystals, 3 ill.

The invention relates to the field of hydraulic structures and can be used in the construction of offshore Jack-up platforms.

There is a method of construction of offshore Jack-up platform on author. mon. USSR N 380825, CL 6 E 21 B 15/02, 1973, including the use of special pontoon with mine, which holds and secures the support section, then the pontoon ballustrade and is brought under the bottom of the marine Jack-up platform, the support section is introduced into the mine, then the pontoon deballasted and together with the support section rises to bearing pontoon under the bottom of the marine Jack-up platform. The support section is inserted into engagement with the tripping mechanism of the platform, then the lower part of the section is exempt from the pontoon, and the cycle is repeated until the entire Assembly support.

The disadvantage of this known method is the considerable complexity and difficulty of ballasting and input section supports the shaft of the platform.

There is also known a method of installation of the marine Jack-up platform, which includes building the platform with outriggers and anchor-mooring arrangements, Assembly, joining and welding the sections of the supports is making its vertical position, slinging the latter to the hook of the lifting means through the shaft tripping mechanism of the platform and its winding in said shaft and hoist lifting means to engagement with the tripping mechanism of the platform (see application for a patent for invention N 94027532/13 from 20.07.94, which has a solution of VNIIKP for a patent from 29.05.96 - prototype).

The disadvantage of the prototype is considerable complexity due to the necessity of making additional pontoon, its mounting on the support and subsequent dismantling.

The technical result of the proposed method of installation of the marine Jack-up platform is providing offshore installation fully assembled bearings with housing platform without the use of additional pontoons.

This is achieved in the method of installation of the marine Jack-up platform, which includes building the platform with outriggers and anchor-mooring arrangements, Assembly, joining and welding the sections of the supports, towing fully assembled support to the point of connection with the body in deep water, ballasting support before making its vertical position, slinging the latter to the hook lifting money through the mine spellane with the tripping mechanism of the platform, before mounting the supports to produce the reception of ballast in the tank outriggers platform, equal to the weight of the supports, and then gradually flood the lower compartments of support until it is brought into the vertical position in which it floats, then support get the rope from the mooring platform mechanism and pull her to Board the platform in the area of the outrigger, and after subsequent zastrocky support to the hook of the lifting means through the shaft tripping mechanism produce ballasting support to the zero buoyancy, then continue ballasting to full flooding, while bearing will not hang on the hook of the lifting means whereby it may be tightened to the body of the platform, then in the presence of currents additionally Ballesteros support before making its vertical position, after which the column delay in the mine prior to engagement with the tripping mechanism of the platform, and after leaving the top of the support from the water track the roll and pitch of the body and produce the pumping replacement prop ballast.

The claimed method is illustrated by drawings, where Fig. 1 illustrates schematically bearing, side view (casting-off afloat). In Fig. 2 - scheme of the platform installation - training support to the institution in mines is blowing.

When ready case 1 platform 2 outriggers and anchor-mooring arrangements 3 is transported to the installation site by tugs (not shown), a support 4 in a horizontal position launchable singly and towed to the installation site.

Before mounting supports 4 produces the reception of ballast in the tank outriggers 2 platform, equal to the weight of the supports 4.

Then make gradual flooding of the lower compartments 5 of the support 4 by known methods, for example by opening the kingstons compartments 5 a diver, until it is brought into the vertical position in which it floats.

Upon completion of the rolling bearings 4, caused by dynamic processes kantowski, the support 4 by means of a tow 6 down to the platform in the area of the outrigger 2, is slid on her rope 7 from anchor-mooring mechanism 3 and tighten it to the Board last. After this cargo sling 8 from the hook 9 of the lifting means (not shown) is passed through the shaft lifting mechanism 10 platform and consolidate the support 4, disconnect the rope 7 and produce ballasting support 4 to zero buoyancy through a hose (not shown), after which the ballasting continue to full flooding, while bearing 4 is hung on the hook 9 gruop niteline Ballesteros support 4 by divers prior to the adoption of its vertical position, then support 4 tighten the shaft to engage with the lifting mechanism 10 platform, and after leaving the top of the support 4 from the water track the roll and pitch of the housing 1 and produce a pumping replacement prop ballast. After bearing 4 completely passed the mechanism 10, it is placed at the position of travelling.

After repeating the above operations for the other two supports 4 mounting platform is completed and it returns to the completion of the project plant-Builder.

The marine installation fully assembled bearing in the shaft housing from under the water by the present method is a unique operation, which up to the present time anywhere in the world is not performed.

The applicant developed technical documentation for installation of supports for the present method in the construction of the rig "Arctic".

1. The method of installation of the marine Jack-up platform, which includes building the platform, Assembly, joining and welding bays supports, towing fully assembled support to the point of connection with the body in deep water, ballasting support before making its vertical position, slinging the latter to the hook lifting money through the mine Ceplene with the tripping mechanism of the platform, characterized in that the hull of the platform do with anchoring and mooring arrangements and outriggers, the latter of which have a tank for the reception of ballast, while before installation supports produce the reception of ballast in the tank outriggers platform, equal to the weight of the supports, and then gradually flood the lower compartments of support until it is brought into the vertical position in which it floats, then support get the rope from the anchor-mooring platform mechanism and tighten it to the Board in the last area of the outrigger, and after further zastrocky support to the hook of the lifting means through the shaft tripping mechanism produce ballasting support to the zero buoyancy, then continue ballasting to full flooding, while bearing will not hang on the hook of the lifting means whereby it may be tightened to the body of the platform and then sucked into the prop shaft to engage with the tripping mechanism of the platform, and after leaving the top of the support from the water track the roll and pitch of the body and produce the pumping replacement prop ballast.

2. The method according to p. 1, characterized in that in the presence of currents additionally Ballesteros support to make it vertical

 

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