Marine ice-resistant platform hull

FIELD: transport.

SUBSTANCE: invention relates to shipbuilding and concerns protection of marine ice-resistant platform hulls against external ice impact. Marine ice-resistant platform hull has reinforced, predominantly vertical, ice sheathing with stiffening set and is provided with rigid elements with triangle cross-section installed on sheathing surface and placed on its surface with creation of multiturn spiral which has generatrix inclination angle to horizon of 10÷70 degrees and spiral pitch not exceeding 1/3 of maximum ice thickness in the area of platform operation. In this system, rigid elements are installed so that horizontal plane determining upper end of spiral is above platform design waterline, and horizontal plane determining lower end of spiral is under platform design waterline where distance in height between planes of upper and lower ends of spiral is not less than 1/2 of ice thickness in the area of platform operation.

EFFECT: lower ice loads on platform hull.

1 dwg

 

The invention relates to the field of shipbuilding and the issue of protection corps marine ice-resistant platforms from external ice impact. Famous building of marine ice-resistant platform, with enhanced ice siding with the supporting set designed to protect the body from the effects of ice formations (Drums NV "case Design ships" - SPb.: Shipbuilding, 1993) prototype. On the well-known case with vertical walls of ice pressure are perpendicular to the surface of the skin, and the force of friction on ice acts as a tangent to the surface of the skin. Ice pressure causes a reaction in a hull that is perpendicular to the surface of the skin, which in turn causes the destruction of the ice in the contact area of the ice and the skin. However, perpendicular to the reaction of the skin, causing the destruction of the ice, compression, leads to the accumulation of ice in the contact area of ice cover, ultimately leading to a large ice loads acting on the body. The task of the invention consists in the reduction of ice loads on the building of marine ice-resistant platform with a predominantly vertical inner covering, by improving the process of destruction of the ice by changing the mechanism of destruction. For this purpose the building of marine ice-resistant platform, with enhanced predominantly vertical ice siding with the supporting set, equipped with a rigid elements, having in the cross section of a triangular shape, the surface-mounted casing and posted on its surface with the formation of multiple spiral, which has the angle of forming the horizon of 10% to 70 degrees, and with the pitch of the spiral - not more than 1/3 of the maximum ice thickness in the area of operation of the platform. However hard the elements set so that the horizontal plane that defines the upper end of the spiral is above the design waterline platform, and the horizontal plane that defines the lower end of the spiral is below the design waterline, the distance in height between the planes of the upper and lower ends of a spiral is at least 1/2 of ice thickness in the area of operation of the platform. The supply of housing offshore ice-resistant platform rigid elements, having in the cross section of a triangular shape, established motionless on the surface of the skin and posted on its surface with the formation of multiple spiral in increments of no more than 1/3 of the maximum ice thickness, creates additional stress concentrators in the destruction of the ice field, allows to improve the destruction of masses destroyed ice from the contact area, that as a result leads to reduction of ice loads on the body of the platform. The essence of the invention is illustrated by the figure, which illustrates the building of marine ice-resistant platform. Building 1-mentioned platform has a predominantly vertical reinforced ice covering 2 with reinforcing internal set (figure not shown) and equipped with outside hard elements 3, having in the cross section of a triangular shape, which is installed on the surface of the shell plating 1 and posted on its surface with the formation of multiple spiral 4, with the angle Phi° forming to the horizon of 10% to 70 degrees, and with the pitch of the spiral - not more than 1/3 of the maximum ice thickness in the area of operation of the platform. Hard elements set so that the horizontal plane that defines the upper end of the spiral is above the design waterline platform, and the horizontal plane that defines the lower end of the spiral is below the design waterline. Distance in height between the planes of the upper and lower ends of a spiral is at least 1/2 of ice thickness in the area of operation of the platform. The case provides the reduction of ice loads as follows. When the movement of drift ice 5 in the direction of the platform is contact ice cover housing 1 2 in the place of installation of rigid elements 3 and destruction of ice in the debris of 6. Installed on the outer casing 2 hard elements 3, forming a multiple-helix 4 due to the formation of channels 7, contribute to the rapid destruction of the destroyed ice 6, which reduces ice loads on the body of the platform. The proposed building of marine ice-resistant platform reduces ice loads on the platform at the expense of improvement of the mechanism of destruction of the ice, which distinguishes it from the prototype. Building of marine ice-resistant platform, which is mainly vertical reinforced ice siding with reinforcing internal set, wherein it is equipped with an external hard elements, having in the cross section of a triangular shape, the surface-mounted casing and posted on its surface with the formation of multiple spiral, with the angle forming to the horizon of 10% to 70 degrees, and with the pitch of the spiral - not more than 1/3 of the maximum ice thickness in the area of operation of the platform, and hard elements are installed so that the horizontal the plane that defines the upper end of the spiral is above the design waterline platform, and the horizontal plane that defines the lower end of the spiral is below the design waterline, the distance in height between the planes of the upper and lower ends of a spiral is at least 1/2 of ice thickness in the area of operation of the platform.

 

Same patents:

FIELD: construction.

SUBSTANCE: antiicing device for a hydraulic structure located on a shallow continental shelf includes protective elements 2 and fastening elements attaching the protective elements to water area bottom. Protective elements 2 are made in the form of submersible many-sided pontoons with possibility of their being filled with ballast material, one end face is provided with an inclined section and equipped with deflector 3 in its upper part, and the other, at least two end faces are vertical, along which pontoons are attached to each other. Pontoons form closed structure 4 in the form of a polygon in a plan view with two front walls 12 forming an ice-cutting wedge along its central axis, with two side walls 13 and rear wall 14 with possibility of its being disconnected. Each pontoon is installed with its end face with the inclined section and deflector 3 outwards, thus forming closed extended deflector 3 and an inclined surface, which envelop the whole structure along external perimeter. Two front walls 12 are made at least of two pontoons in the form of symmetrical polygons elongated in a longitudinal direction and provided at least with four side faces. Side walls 13 and rear wall 14 are made of pontoons in the form of polygons at least with three side faces. Side wall 13 is tightly attached with its end surfaces to vertical surfaces of front 12 and rear 14 walls. Fastening elements are made in the form of hollow piles and installed throughout the height of pontoons of front 12 and side 13 walls into the corresponding through holes 5.

EFFECT: improving protection efficiency of a hydraulic structure against ice and simplifying the device design.

9 cl, 13 dwg

FIELD: construction.

SUBSTANCE: method consists in filling of a shell with evaporated sea salt, shaping the shell as the construction block. When an air impermeable shell is used, underpressure is developed inside it.

EFFECT: possibility to create elements of structures for construction with usage of cheap and available materials.

2 cl, 2 dwg

Floating platform // 2509025

FIELD: transport.

SUBSTANCE: invention relates to floating craft, particularly, to pontoons, floating docks and rafts. Floating platform comprises at least two flowing elements interconnected by at least one lock and composed by two sides with at least one vertical ledge at every said side and at least one vertical recess mating said ledge. Top face and bottom make hollow hull. Vertical ledge features narrowed part changing over in widened to make bearing plate. Vertical recess features narrowed part changing over into part widened towards the center to make bearing plate. One of said sides has locking element covering from above said ledge and bearing ledge on opposite side from said ledge. Support flange for locking element on side, on both sides of vertical ledge. Extra external ledge is made on side between vertical ledges.

EFFECT: increased displacement and tonnage at unchanged overall dimensions.

3 cl, 4 dwg

Floating platform // 2508225

FIELD: transport.

SUBSTANCE: floating platform comprises at least two floating elements jointed together by at least one fastening element. Every floating element consists of at least two side faces with at least one vertical ledge at every said two side faces. Besides, every side face has one vertical recess mating said vertical ledge. Top face and bottom make hollow hull. Also, there is one eye to accommodate fastening element. Every said vertical ledge and every vertical recess are made at the part of appropriate side face to make thrust platform at said ledge and thrust platform at said recess.

EFFECT: higher reliability, expanded operating performances.

3 cl, 4 dwg

FIELD: transport.

SUBSTANCE: invention relates to floating means intended for specific purposes, particularly, to structures of floating elements that make identical sections of construction of floating platforms. Floating element comprises at least two sides with at least one vertical ledge at said two sides with at least one vertical recess corresponding to said vertical ledge, top side and bottom to create hollow body with at least one ear for fastener. Every vertical ledge and appropriate vertical recess are composed by at least three faces two of which parallel and perpendicular to third face.

EFFECT: higher reliability, sufficient manufacturability.

2 dwg

Floating platform // 2504498

FIELD: transport.

SUBSTANCE: invention relates to special-purpose floating means, for example, pontoons, floating docks, rafts, etc. Floating platform comprises at least two floating elements connected by one joint, each consisting of at least two lateral faces with at least one vertical ledge at each lateral face with at least one vertical recess complying with vertical ledge, top face and bottom that make hollow hull with at least one lug to accommodate connection element. Every vertical ledge and appropriate vertical recess are composed by at least three faces two of which parallel and perpendicular to third face.

EFFECT: higher reliability, expanded operating performances.

4 dwg

FIELD: construction.

SUBSTANCE: method includes production of civil and assembly works for erection of float-on elements in a dry dock, filling of the dry dock with water and release of float-on elements from the dock via a floating dam. Besides, at least two float-on elements are combined until they float with the help of temporary links into a single system that represents a stable multi-body vessel.

EFFECT: increased manufacturability of making float-on elements of hydraulic engineering structures, their material intensity is reduced, and stability of float-on elements is ensured with lower subsidence, and also requirements are reduced to characteristics of dry building docks.

8 cl, 6 dwg, 1 tbl, 1 ex

FIELD: construction.

SUBSTANCE: method to withdraw piles from water area soil includes withdrawal of piles mechanically. Piles are withdrawn with a hydraulic grip, which is installed on a vessel of catamaran type, in the nose part between frames, above the waterline. Ballast reservoirs are filled with water. The vessel is settled to the waterline. The pile is tightly gripped with the hydraulic grip. Water is pumped from ballast reservoirs, and the pile is withdrawn from soil as a result of higher vessel floatability.

EFFECT: reduced labour intensiveness and material intensity of works performance, improved method of piles withdrawal from water area soil.

FIELD: construction.

SUBSTANCE: method provides for erection of fit-in reservoirs on the surface of ice cover, their filling with sea water, layerwise freezing of water with removal of brine at the same time, drilling of wells in the ice cover, filling, freezing of fresh water in them and strengthening of the ice cover, and also cooling of ice and bottom deposits with thermal siphons. At the same time in process of ice cover strengthening the reservoirs are installed relative to each other at the distance of more than 0.25 m, and sea and fresh water is frozen to the height that exceeds double thickness of natural ice freezing. Then on the surface of sections of strengthened ice cover interaction with movable ice fields, ice roads, additional reservoirs are erected, sea water is frozen in them, and ice supports and water-filled sluice chambers are created under the strengthened ice cover, being rested against the bottom. In the supports and the below bottom deposits, wells are drilled, thermal siphons are installed in their cavities, and negative temperatures are maintained in the supports and bottom deposits. To protect vessels against storms, drift of ice fields, a hydrotechnical lock is installed in one of ice supports of the sluice chamber, and with the lock open a vessel is entered or moved out from the sluice chamber into the sea.

EFFECT: long-term safe delivery of cargo to an unequipped shore of Arctic sea, hydrocarbon materials to consumers.

2 cl, 3 dwg

FIELD: construction.

SUBSTANCE: ice-resistant platform 1 comprises a lower 4 and an upper 2 truncated conical parts with tops directed accordingly up and down, and a cylindrical part 3 arranged between them. The platform is made in the form of a gravity platform, in which the total height of the upper truncated conical part and the cylindrical part makes not more than where is average depth of ice keel in the place of platform location. The lower truncated cone with the top has height equal to the water reservoir depth in the place of platform installation and the average depth of the ice keel. The angle α between the generatrix of the lower cone of the platform to the vertical line makes at least the angle defined from the ratio αarctg(gMnFlimit), but not less than 45°, where n - margin, Flimit - limit load shifting the platform, g - free fall acceleration; M - platform mass, containing useful mass and mass of accepted ballast.

EFFECT: stability of platform position on soil under action of a global ice load due to its minimisation and increased force that presses a platform when affected by large ice hummocks.

3 dwg

FIELD: transport.

SUBSTANCE: marine ice-resistant process platform comprises overwater part with horizontal areas and process equipment installed on them, underwater part made as water displacing hull, anchor holding system allowing platform to turn relative to vertical axis, ballast tanks located in water displacing hull. The ballast tanks are located throughout the length of water displacing hull. Overwater part is made as fore and after towers where the upper part of towers in ice waterline region is made as ice-breaking cone facing by its narrow part down, and the lower part - for instance in the form of cone facing by its narrow part up. Distance from sea level during operation in ice conditions to upper part of water displacing hull is greater than maximum possible draught of ice formations. Axis of anchor holding system is located in the region of fore tower.

EFFECT: lowering load on hull and anchor holding system.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to facilities of the continental shelf development. An offshore floating platform contains an undersea displacement module, a support subsea module with rigid support columns and binders, and straining ties fixed at seabed anchors. The support columns and binders can be detached from the undersea module in order to escape quickly from an ice-hazardous area and to return back to the abandoned place. The subsea module is made of individual sealed pontoons interconnected by rigid ties capable of limiting relative motion. The support columns of the subsea module are equipped with mechanisms for connection to pontoons of the undersea module and for interconnection of the modules.

EFFECT: improved reliability of the modules coupling/decoupling, simplified ballasting process.

6 cl, 5 dwg

Floating platform // 2518779

FIELD: transport.

SUBSTANCE: floating platform contains connected by at least one fixing element at least two floating elements each one of which consist of two side faces with at least one vertical projection on each of them with at least one vertical recess on each of them matching vertical projection. Vertical projection is made with narrowed portion changing into widened towards periphery portion to form supporting pad. Vertical recess features narrowed portion changing over into part widened towards the centre to from resting pad. On one of side faces at both sides of vertical projection there are flanges being supporting for corresponding fixing element. On the second side face at both sides of vertical projection there are two projections: one is at one side of this vertical projection and at least enveloping at least from above the corresponding fixing element, and the other is at other side of this vertical projection and at least supporting for corresponding fixing element. These two projections are parts of mating sockets of corresponding fixing elements.

EFFECT: higher reliability, enhanced operational functionality due to increased displacement and bearing capacity of platform.

3 cl, 5 dwg

FIELD: transport.

SUBSTANCE: invention relates to ship building, particularly, to sea gravity ice-breaking platform to be used in shallow water. Said platform comprises bearing plate composed of hollow body dividing in compartments filled with ballast and top displacement hull with processing and ship equipment built in bearing base deck closed elevation to uncouple them. Inner boundary of said deck elevation is equidistance in plan with floating structure outlines with difference in sizes defined by the relationship: δ=δïã, where δis aforesaid difference, δï is maximum sum of construction deviation of sizes ob said body and hull from rated values, δãis guaranteed clearance required for alignment of top structure with platform bearing base outline.

EFFECT: higher operating efficiency in ice.

2 cl, 2 dwg

FIELD: transport.

SUBSTANCE: invention relates to ship building, particularly, to production of ice-resistant platforms for exploration of freezing sea offshore oil and gas deposits. Proposed platform is equipped with remote turret assembly consisting of the block accommodating the turret and located outside platform hull to allow the latter to turn in external force main vector direction and to be retained in place by anchor system connected with said turret. Said block with turret are located under water ahead of fore perpendicular at the distance not smaller than half the difference between platform maximum length and that between perpendiculars. Block top is located level with the platform base plane. Said block features the hull axially symmetric shape with respect to vertical axis and is secured to platform hull with the help of corbel shaped to trihedral pyramid with clearance between ribs and facing the hull stem by its base. Pyramid two ribs are located in the platform base plane while third rib rests on said stem. Said rib features sharpened top edge.

EFFECT: higher safety of turret, anchor and riser lines in ice.

2 dwg

Floating platform // 2509025

FIELD: transport.

SUBSTANCE: invention relates to floating craft, particularly, to pontoons, floating docks and rafts. Floating platform comprises at least two flowing elements interconnected by at least one lock and composed by two sides with at least one vertical ledge at every said side and at least one vertical recess mating said ledge. Top face and bottom make hollow hull. Vertical ledge features narrowed part changing over in widened to make bearing plate. Vertical recess features narrowed part changing over into part widened towards the center to make bearing plate. One of said sides has locking element covering from above said ledge and bearing ledge on opposite side from said ledge. Support flange for locking element on side, on both sides of vertical ledge. Extra external ledge is made on side between vertical ledges.

EFFECT: increased displacement and tonnage at unchanged overall dimensions.

3 cl, 4 dwg

Floating platform // 2508225

FIELD: transport.

SUBSTANCE: floating platform comprises at least two floating elements jointed together by at least one fastening element. Every floating element consists of at least two side faces with at least one vertical ledge at every said two side faces. Besides, every side face has one vertical recess mating said vertical ledge. Top face and bottom make hollow hull. Also, there is one eye to accommodate fastening element. Every said vertical ledge and every vertical recess are made at the part of appropriate side face to make thrust platform at said ledge and thrust platform at said recess.

EFFECT: higher reliability, expanded operating performances.

3 cl, 4 dwg

FIELD: mining.

SUBSTANCE: according to the invention, inside the housing of a drilling ship mooring turret, which has a cylindrical housing with a drilling shaft and an anchor retention system of the ship, in its lower part there installed is an annular cylindrical structure with ballast compartments, which can move vertically along guides below the main plane of the drilling ship. Inside the shaft there arranged are deflectors located along the perimeter of the shaft on its walls above the ship waterline.

EFFECT: invention of a drilling ship mooring turret structure allows protecting a riser pipe at drilling operations under ice conditions and protecting against flooding of an upper deck of the drilling ship through the drilling shaft at stormy drift or at transition of the drilling ship under conditions of considerable disturbance, especially at negative air temperature contributing to formation of ice on deck structures of the drilling ship.

2 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: underwater rig comprises two submarines, one making deep-water drilling complex. Said complex consists of two modules, one making process module for executing the entire cycle of well construction and another one making the drilling module. Second submarine represents a nuclear underwater power production complex. Process module comprises drilling module supercharging system, storage battery compartment connected with cable joint. Process module top section is equipped with float emergency chamber with docking assemblies and self-propelled submarine while bottom section is provided with lock chamber with lifter. Drilling module is arranged vertically relative to process module and connected therewith by pipeline and power cables. Drill rig with hydraulic drive is arranged at drilling module centre. Bottom thrust plate, set of preventers, drill tool are arranged in drilling g module axial plane while pipe feed and making-up automatic device is arranged on opposite side.

EFFECT: higher efficiency.

4 dwg

FIELD: transport.

SUBSTANCE: invention relates to active and passive stabilisation of a vessel, for example, ships, vessels for operation in shallow waters, floaters, drill rigs and lifting cranes. Vessel 10 is equipped with buoyancy and/or ballast cisterns 11a-d. The latter have openings 12a-d made in vessel bottom. Said openings allow passage of notable flow of water without cavitation of whatever other type of drag. System comprises means 13a-d for feeding fluid into cisterns 11a-d controlled to ensure opposition to external force action to motion of ship vessel 10. Invention covers also the method of active and passive stabilisation with the help of above described system.

EFFECT: higher safety in open sea.

24 cl, 11 dwg

FIELD: transport.

SUBSTANCE: marine ice-resistant process platform comprises overwater part with horizontal areas and process equipment installed on them, underwater part made as water displacing hull, anchor holding system allowing platform to turn relative to vertical axis, ballast tanks located in water displacing hull. The ballast tanks are located throughout the length of water displacing hull. Overwater part is made as fore and after towers where the upper part of towers in ice waterline region is made as ice-breaking cone facing by its narrow part down, and the lower part - for instance in the form of cone facing by its narrow part up. Distance from sea level during operation in ice conditions to upper part of water displacing hull is greater than maximum possible draught of ice formations. Axis of anchor holding system is located in the region of fore tower.

EFFECT: lowering load on hull and anchor holding system.

2 dwg

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