Offshore ice-resistant platform
(57) Abstract:The invention relates to hydraulic structures, intended for the production of oil and gas on the shelf of the freezing seas. In the offshore ice-resistant platform, comprising a supporting head, a working platform and piles fixed in the ground and passing through the bearing cap, the latter consists of a supporting holder having a surface for mounting piles, based on the clip body in the form of a hyperboloid of rotation, the upper belt which has a working platform. Piles made of steel tubes, with the outer surface of the piles, as well as the inner surface of the conductors, has the form of a screw. The platform for interaction with a moving ice field due to the shape of the hull has a minimum horizontal load. Hull shape also reduces the energy of the shock wave, that is, to reduce vibration of the structure. 1 Il. Usage: in hydraulic engineering in the construction of fixed platforms for oil and gas on the shelf of the freezing seas.Known common design of ice-resistant platform, consisting of a base plate installed on the subgrade on DN sea is roitelstvo concrete platforms for the continental shelf of Norway. Translation. Nordisk betong, 1982, N 2-4, S. 82-86; Vershinin, S. A. design of ice-resistant platforms. VINITI. The results of science and technology. Series: Water transport. Volume 13, S. 15-18, M., 1988).The disadvantage of such structures is a large amount of work, including underwater, the alignment of the base, the construction of the piers to prevent erosion of the base, sliding and overturning of the base plate and of the whole structure.Also known construction support unit of the ice-resistant platform (patent RU 2089704 C1, class E 02 B 17/00), consisting of databases installed on the ground surface and secured thereto by piles, tapered octagonal ice-cutter and the bearing cap with the working platform. The rigidity of the structure is vertical and horizontal diaphragms.The disadvantages of this design are the need to level the ground on the seabed, the accumulation of ice from the impact of the ice field.A common disadvantage of the considered structures (gravity) is a heavy weight structures that can withstand the impact of ice fields, and as a result, wastage of material and energy cost of their construction.Susa hull of the platform in the form of a hyperboloid of rotation, on the upper belt which is mounted working platform. The lower part of the housing serves to break up the ice and to minimize horizontal loads from the effects of the ice fields by redistributing and modifying the vertical. The housing cavity are used as containers for temporary storage of oil. The support clip includes jigs for mounting piles. The number of piles is even, a minimum of 6 pieces.The design of the platform is in reinforced concrete and metal.The platform is towed to the job site fully assembled and equipped with technological equipment condition, half of the pile is lowered and rests on the bottom, acting as stabilization, the remaining piles Sabouraud to the depth necessary for strong coupling with the ground, then at the same depth Sabouraud stabilizing piles. The platform is ready for use.The drawing shows marine piling ice-resistant platform with hyperbolic case. The platform consists of a base casing 1, comprising conductors 2 for mounting piles 4, case 3, is made in the form of a hyperboloid of rotation based on the clip, and the working platform 5 based on to the feature conductors, is in the form of "screw", which allows the pile to gain a foothold in the soil and in the conductor.The main function of the hyperbolic case the platform is that the ice field at an acute angle, without resistance crawling on the flat part of the shell, with gradual smooth change in its curvature collapses under its own weight.Thus, the horizontal load from moving ice fields are modified in the vertical from the weight of ice and transferred to the piles. The shape of the surface is such that destroyed the ice without obstacles rolls off her, not accumulating in the hummocks.The properties of the hyperboloid of rotation as the surface of double curvature can refuse additional rigidity and diaphragms, which significantly simplifies the design.The upper part of the hyperbolic case is how to install a working platform, and to reduce the impact energy of a wave and as a consequence reduce the vibration of the whole structure.An additional effect may lie in the fact that when drilling deviated wells using cavities piles from one platform to capture a larger area of the oil field. Marine ledston Asia through the anchor head, characterized in that the supporting head consists of a supporting holder having a surface for mounting piles, based on the clip body in the form of a hyperboloid of rotation, the upper belt which has a working platform, and the piles are made of steel tubes, with the outer surface of the piles as well as the inner surface of the conductors, has the form of a screw.
FIELD: blasting operations, applicable for destruction of continuity of the ice or soil cover and formation of a passage in them, for example, for destruction of an ice gorge.
SUBSTANCE: the method consists in placement of parachute systems with ammunition on the flight vehicle, their delivery to the preset point, release and blast of ammunition. Elongated flexible explosive charges with initiating devices with a preset delay time connected with one end to penetrators, and with the other end - to the parachutes, assembled in packing cases, are used as ammunition. After the release, the parachute systems turn the flexible explosive charges to the rectilinear position with the penetrators down, separate them from the parachute systems, and the initiating devices are systems, and the initiating devices are remotely cocked.
EFFECT: enhanced efficiency of destruction of the ice or soil cover.