SU998227A1 - Mobile submersible offshore foundation - Google Patents

Description

(54) MOBILE SHIPPING SEA

one

The invention relates to hydraulic structures and can be used to create offshore drilling rigs.

A mobile marine submersible base is known, which contains a platform for technological equipment connected by means of columns to pontoons, an auxiliary float mounted on chains, each of which is located along the columns on the bypass rollers and meshed with an asterisk mounted on a shaft mounted on the platform and fitted with an overhang clutch with tared torque IJ.

The disadvantage of the design is that with large heeling moments that occur with large displacements of the pontoons, the block of sprockets with the overrunning clutch becomes cumbersome and practically difficult to implement.

The aim of the invention is to simplify the design and increase the reliability of the device.

In order to achieve this goal, the device is equipped with additional shafts, which have a BASE

The overrunning clutches, with all the shafts arranged horizontally with intersection in terms of their axes, and the mentioned sprockets are mounted at the ends of the shafts, in this case aforementioned. The powerful float is made in the form of a rigid hollow body, covering the base along the perimeter.

FIG. 1 shows the base in various stages of immersion, a general view; in fig. 2 - stabilizing device, plan. 10 The mobile marine submersible base consists of pontoons 1, connected by columns 2 with platform 3 for technological equipment (conventionally not shown). On columns 2 with the possibility of j movement along them, an auxiliary float, 4, is a hollow body, such as a toroid, covering the perimeter of the columns and having sufficient flexural and torsional rigidity. In several places, evenly across the congo ture, the auxiliary float 4 is attached to the same (i.e., moving in the same direction) branches and 5 chains 6, the enveloping sprockets 7. The chains 6 bend around the lower bypass rollers 8.

The sprockets 7 are fixed at opposite ends of the shafts 9, each of which is associated with a free-wheeling clutch 10 of the limiting moment. The shafts 9 are arranged horizontally, crosswise, the axes of the shafts in the plan can also be located at an indirect angle to each other. Bypass clutches 10 may not be supplied with each shaft 9, but with two or three shafts.

The magnitude of the limiting moment of the overrunning clutches 10 is selected so that they slip after the supportive float 4 is submerged to a level when its carrying capacity exceeds a value in the range of 40-80% of their total carrying capacity. Downstream, the float 4 can move on chains 6 without interruption.

The device works as follows.

The mobile submersible marine basement is transported to the installation site. After being delivered to the installation site, the pontoons 1 are ballast and go under water, and the auxiliary float 4 remains afloat, sinking by 40-80% of its carrying capacity, providing the required moment of inertia of the section along the waterline. He cannot go deeper because the overrunning clutch 10 slips. Thus, the auxiliary float 4 is afloat and due to the transfer of the supporting force through the chains 6 and the overrunning clutches 10 of the limiting moment creates an anti-roll moment when the base is applied.

At the end of the dive, when the pontoons 1 reach the groove, the auxiliary float 4 is flooded.

During the ascent, the auxiliary float 4 is blown with air, as a result of which it floats above the surface of the water as far as the overrunning clutches 10 of the torque limit allow. Due to the rigidity of the auxiliary float 4, all the shafts 9, and with them the overrunning clutches 10, operate simultaneously and provide movement of the float 4 up under the action of a force less than the force from the float of a fully submerged float.

After the auxiliary float 4 emerges, the pontoons 1 are flushed, all the structures begin to emerge, and the auxiliary float 4 remains on the surface of the water all the time. Since the axes of the shafts 9 intersect in the plan, i.e. form a plane, and for the reasons given above, the plane of the platform 3 constantly remains parallel to the plane of the float 4, i.e. horizontal.

Water level tracking with an auxiliary float is automatically provided without complicated mechanisms. Due to this, the installation and lifting of the structure can be carried out without a roll and in a short time. At the same time, the implementation of an auxiliary float in the form of a single rigid body and the associated dispersion of a synchronizing device can simplify its manufacture and operation, as well as improve reliability.

Claims (1)

Invention Formula Mobile submersible marine base containing a platform for technological equipment, connected by means of columns to pontoons, an auxiliary float mounted on chains, each of which is located along the columns on bypass rollers and meshed with an asterisk mounted on a shaft mounted on the platform and fitted with an overrunning clutch with a torque limit, characterized in that, in order to simplify the design and increase the reliability of the device, it is provided with additional shafts having These couplings, while all the shafts are horizontally intersected in terms of their axes, the mentioned sprockets are mounted on the ends of the shafts, while the auxiliary float is made in the form of a rigid hollow body covering the base around the perimeter. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 807704, cl. B. 63 B 35/44, 1979 (prototype). .Q p-: li c  four,- - bi. n f M " & CM -7-П7 to / OQ ic &