Offshore ice-resistant platform

 

(57) Abstract:

The invention relates to the field of hydraulic engineering construction, in particular to the construction of offshore platforms offshore freezing seas. Offshore ice-resistant platform consists of a base with two ice pillars, towering over the water. On ice pillars on the sides directed toward each other are polyspastny blocks. The upper structure is made of floating or is delivered to the pontoons. On the deck of the upper structure are also polyspastny blocks corresponding polyspastny blocks on the outriggers. On the deck of the superstructure near polyspastny blocks are winches, cables which connect polyspastny blocks of the outriggers and the upper structure. After installation and fixing piles (if necessary) to the bottom of the offshore ice-resistant platform prisonerofwar upper structure and enter it between resistant supports. With the help of cables-wires led rope winches in polyspastny blocks outriggers and top of the structure and secure the end of the rope accordingly. When working winches begins the ascent of the upper structure up until his deck will not be flush with the deck of lagostoma expensive floating cranes. 2 C.p. f-crystals, 6 ill.

The invention relates to the field of hydraulic engineering constructions, in particular, on the shelf freezing seas for oil and gas.

Known hydraulic structure (U.S. patent N 4784526, 1988, MKI E 02 IN 17/02, NCI 405/204), including installation on the bottom of the waters of the ice-resistant supports, attaching them to the piles to the bottom, transportation topside process facilities on floating means, the planting of the upper structure on ice-resistant support and waste water craft. The disadvantage of such hydraulic structures is that they require special precautions.

Also known offshore ice-resistant platform (patent RF N 2040638, 1995, MCI E 02 In 17/00), including the upper structure in the form of self-elevating floating platform, mounted on retractable from ice supports struts. The disadvantage of this solution is the need to use self-elevating floating platform.

The invention is schematically depicted in the drawings, where Fig.1 shows a General view of the platform of Fig. 2 is a top view (Fig.1), and Fig.3,4 - supply and the rise of the upper structure of Fig.5 - the location of the retractable fingers; Fig.6 - section a-a (Fig. 5).

what's to the bottom of the pile. On the sides of the supports are the outriggers 4,5,6,7, which are polyspastny blocks 8,9,10,11. The upper structure is made in the form of pontoon 12, inside and on the deck there are technological equipment. On the deck of the pontoon are polyspastny blocks 13,14, 15,16, United elements of the flexible connection cables with polyspastny blocks of ice pillars and winches 17,18, 19,20. On the supports, the outriggers and the body of the pontoon is made of slot 21 (Fig.5,6), which can move the fingers 22.

Instead sheave sheave pulleys can be installed sprockets, and instead of a cable chain.

Offshore ice-resistant platform is used as follows.

In magleby period-resistant base is delivered to the installation site and sinks to the bottom. Then is piling (if required) through the ice pillars 2.3 and underwater housing 1. After that, the upper structure in the form of pontoon 12 will riboxinum and slid it between resistant supports. The cable from the winch 17, 18, 19,20 with the help of cables - wires led into polyspastny blocks 8, 9, 10, 11, and 13, 14, 15, 16, and the end of the rope is fixed accordingly.

When all four winches 17, 18, 19, 20 produce lift pontoon 12 to it, push the cylinders before putting them into the slots on ice pillars 2, 3. Then the rope winches relax and transmit the entire load on the fingers. Technical and economic advantage of the proposed technical solution is the reduction of construction works in the sea and abandoning the use of expensive floating crane vessels.

1. Offshore ice-resistant platform, including an underwater housing that is attached to the bottom of the pile, and two-resistant supports, installed opposite each other towering above the water, the upper structure with the technological equipment and the nodes connecting the upper structure with ice-resistant platform, characterized in that at the level decks-resistant bearings installed outriggers made on the sides and aimed at each other, which are polyspastny blocks, and the corresponding polyspastny blocks placed on the deck of the superstructure near the winch, through which are passed the flexible connection elements polyspastny blocks of ice pillars and the upper structure, and the nodes are connected in the form of retractable fingers mounted for movement in the slots made in the supports, the outriggers and the housing of the upper structure.

rouxeny through pulleys polyspastny blocks.

3. Offshore ice-resistant platform under item 1, characterized in that the flexible connection elements made in the form of chains passed through a chain sprocket mounted on polyspastny blocks.

 

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