SU943082A1 - Method of constructing self-raising offshore platform - Google Patents

Description

The invention relates to shipbuilding technology and relates to methods for constructing and launching self-lifting platforms, for example, for the development of the sea shelf. There is a known method of building a marine self-lifting platform, including mounting on a stepper of a platform casing, installing superstructures on it, a derrick, lifting mechanisms and partial formation of supporting columns, the platform being moved to an outhouse pier, the edges of the platform casing are mixed with lifting mechanisms and columns with an overhang above the water, and after mounting the plate is inserted from the pier G1. A disadvantage of the known method is the high cost of building a self-lifting platform in connection with elevated the cost of transporting parts of the hull of the sea self-erecting platform {jurma. The purpose of the invention is to reduce the cost of construction. This is achieved; by the fact that the lower sections of the supporting columns are installed in the cut-outs of the installation and launch pontoons, after which the latter are brought under the platform body to the pier, then the formed parts of the supporting columns are lowered and joined to the lower sections, after which launching pontoons from under the hull, set up supports on them, re-enter the hull under the hull and de-assembled the erection-launching pontoons, and then tow the platform to the erection-launching pontoons to complete withdrawal from the pier, lower the support columns to the lifting mechanisms stop them in the ground and raise the platform above the assembly and triggers pontoons, and then output the last out of the platform hull and opuskakl platfork in lifting mechanisms to ascent. FIG. Figure 1 shows the platform on the pier and the mounting and launch pontoons with 1 main sections of the supporting columns in the designated position; in fig. 2 is also a top view; in fig. 3 - platform on the pier and mounting pontoons with lower sections of supporting columns, connected to the hull; in fig. 4 - plate shaped pier and mounting pontoons with supports in the assigned position; in fig. 5 - the same, top view; in fig. 6 - the platform on the mounting-start pontoons was removed from the pier; in fig. 7 - the same, front view; in fig. 8 - the platform stands on supporting columns, mounting and launching points are retracted; in fig. 9 is a platform for the method as follows. The hull 1 offshore self-lifting platform installed on it Memo 2 lifting lift setting 3, a derrick (not shown) and partially formed supporting columns 4 are moved on the ship carts 5 from the stocks 6 to the pier building 7 so that the housing 1 with mechanisms 2 and columns 4 is above water. The lower sections of the 8 columns 4 were installed in pairs in the cuts 9 of the two assembly and launch pontoons 1O, ballasted to increase their draft, and fixed in a vertical position (Fig. 1 and 2). The pontoons 10 are led to the pier 7 so that sections B are above the formed parts of the columns 4. With the help of the mechanisms 2, the columns 4 are lowered and joined to sections 8, after which they are welded together and raised up by one length sections (Fig. 3). The operation is repeated until the columns 4 are completely formed. The pontoons 10 are led out from under the hull and the supports 11 are mounted on them (Fig. 5). Then pontoons U with supports 11 are brought down below the overhanging bodies of water pipe 1. At the same time, columns 4 freely enter the notches of 9 pontoons 10. The latter, due to the blowing of the ballas, float and support 11 and lift the body 1 above the carriages 5 after it) The platform is towed along pier 7 to complete removal from the pier (figs. 6 and 7). Using mechanisms 2, columns 4 are lowered to ground in the ground and case 1 is lifted from supports 11 of pontoons 10, which are then removed from under the case (Fig. eight). After this, the columns 4 are raised by the mechanisms 2 to the extreme upper position, and the platform body 1 is lowered onto the water (Fig. 9). The technical and economic effect of the application of the invention is achieved in connection with the elimination of the need to use a dry dock and the cost of its maintenance when building offshore self-elevating platforms using mounting and launching pontoons. Formula of the invention. A method of building an offshore self-lifting platform, including mounting on the slipway of the platform body, installing a superstructure on it, a drilling rig, lifting mechanisms and partial formation of supporting columns, the platform being moved to an extension pier, the edges of the platform body with lifting mechanisms and formed parts of the supporting columns with an overhang above the water, and after installation the platform is removed from the pier, characterized in that, in order to reduce the cost of construction, the lower sections of the supporting columns are installed in The cutouts of the mounting and lowering pontoons, after which the latter are brought under the platform body to the pier, then the formed parts of the supporting columns are lowered and joined to the lower sections, after which the mounting and lowering pontoons are pulled out from under the body, they are supported plant under the hull and deball the mounting and launch pontoons, and then tow the platform to the mounting and launch pontoons to complete withdrawal from the pier, lower the lifting mechanisms until they stop into the ground and raise the platform above the mounting and launch pontoons, after outputting the latest from the platform body and the platform is lowered mechanical; elami lift to ascend. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 735478, cl. B 63 B 9 / OO, 27.O9.78 (prototype).

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Claims (1)

Claim A method of constructing a marine self-elevating platform, including mounting a platform body on a slipway, installing an add-on, a derrick, lifting mechanisms and partial formation of support columns, the platform being moved to an outbuilding pier, the edges of the platform body with lifting mechanisms and formed parts of the supporting columns with overhang are placed above the water, and after installation, the platform is removed from the pier, distinguished by the fact that, in order to reduce the cost of construction, the lower sections of the support columns are installed in the cutouts pontoons, after which the latter are brought to the pier under the platform body, then the formed parts of the support columns are lowered and joined to the lower sections, after which the assembly and release pontoons are removed from under the body, the supports are mounted on them, re-placed under the body and de-ballast assembly and launch pontoons, and then tow the platform on the assembly and launch pontoons to the full withdrawal from the pier, lower the lifting mechanisms all the way into the ground and raise the platform above the assembly and launch pontoons, after which the latter are brought out from under rpusa platform and lower platform lifting mechanisms to ascent.