Method of engineering protection of fpu platform from ice events in conditions of arctic shelf

FIELD: construction.

SUBSTANCE: method includes the installation along the platform perimeter of the protective cladding structure. Meanwhile before placing the platform into design position along the platform perimeter with a clearance at least one row of supports from metal piles with round section sunk into unstable bottom sediments or into bed rocks. Into piles the coolers are mounted, and artificial freezing of water and ground around piles, and the monolithic cylinders, formed around piles - ice and grounding in the base and icy in water, shall contact the adjacent cylinders, forming continuous ice and ground in the base and icy in water protective anti-chock and impervious wall.

EFFECT: improvement of efficiency of an engineering protection of platforms of a floating type in conditions of the Arctic shelf.

6 cl, 3 dwg

 

The invention relates to the construction of hydraulic structures and relates to a method of creating a building envelope, intended for the protection of floating production platform type in the exploration and exploitation of oil and gas deposits in the ice conditions of the Arctic shelf.

Known belt design of ice protection (EN 2382849 C1 IPC EV 17/00, published 27.02.2010,), performed a U-shaped, the branches of which are installed along the entire length of the towed body with a gap, the value of which exceeds 2 meters, and involve the tip of the towed body with joining resistant housing block conductor. Belt protection from ice made in the form of a piled structure, elements of which are installed with the formation of the inner and outer rows of equidistant piles and connected by spacers in a checkerboard pattern, and the height of the inner row of piles exceeds the height of the outer row of piles.

Known protivogradovye protective barrier (EN 67590 U1, IPC EV 15/02, published 27.10.2007), comprising two rows of piles, arranged in a checkerboard pattern, and inclined beam, simply supported at the pile heads, recessed into the bottom waters. Mark the tip of the piles of the second row is at a maximum elevation of water level HC during the ice drift, and mark the tip of the piles of the first row is at the level of the lower surface of the ice during the ice drift, clicks the Zuya inclination angle β of the inclined beams. Each pile protective barrier installed at least two oblique beams. Ice brought over, crawls on sloping beams broken by bending under the action of gravity falls between the piles of the first row, forming ice barrier.

Application of known walling is possible in shallow Arctic shelf stable soils at the base. In addition, in the event of a spill famous building envelope does not provide containment of oil pollution.

Reliable operation of oil platforms that are installed on the Arctic shelf, depends on the ratio between the parameters of the ice structures and form barriers to their movement. The formation of hummocks, increasing the thickness and size of the ice fields from the influx of ice, and the wind surge ice fields increases several times the horizontal ice load, which, in turn, requires strengthening protection from ice.

The proposed solution allows to solve the problems associated with the operation of production platforms floating type on the Arctic shelf by providing year-round protection engineering exploration and production platforms floating type from adverse climatic impacts in terms of the Arctic shelf, including PR is the presence of weak and permafrost in the ground.

The solution of this problem is achieved in that in the method engineering protection of floating production platform type from ice impacts in terms of the Arctic shelf, including the device around the perimeter of the platform protective cladding according to the invention prior to the installation of a production platform in the design position (above the hole) and its installation on the perimeter of the platform with a gap set at least one row of supports of metal piles of circular cross section embedded in unstable sediments or bedrock. In piles mount freezing device. After mounting the freezing devices include in the work, and they must be around piles monolithic cylinders - supports large diameter - logrotate - based and ice - water. The step of installation of piles, expect to cylinders of frozen soil and water formed around the piles, was merged with the neighboring cylinders, forming a solid ledogorov in the ground and ice in the water protective shockproof and anti-seepage wall.

The horizontal forces acting on the protective shockproof and anti-seepage wall are transferred to the vertical bearing supports of metal piles through arrays nevrogennogo ice, and therefore the number of rows of piles, the cross section of the pile, the depth of preparing the program of the Foundation soils and the diameter of numerazione must be designed for this load.

Artificial freezing of water and soil around the footings carry out freezing devices of two types: stenogastrinae working in the cold period of the year with the use of natural cold and using a system of compulsory freezing, which represents a closed loop of plastic tubing connected with the compressor settings. Polyethylene tubes are mounted in a metal pipe, which is installed in the metal pile. Nutricline the cement space. Under the action of compressor installations plastic tubing moves the liquid refrigerant of low (up to minus 15...20°C) temperature. As a result of heat exchange with the surrounding water and soil environments is the frosting around the piles monolithic cylinder bearings, large diameter, ledogorov in the ground and ice in the water, which, being closed in Messina space, form a continuous protective shockproof and anti-seepage wall. The refrigerant temperature is set in accordance with the desired settings of the protective wall.

In the surface part between the piles satisfied with horizontal and vertical linkages that prevent horizontal displacement when ice and wind loads.

The height of the metal piles above sea level is chosen from the condition of maximum possible PE is Emesene ice formations and waves relative to the construction site, and it is not less than the sum of the thickness of the ice formations and at least equal to twice the height of the calculated wave area.

In addition, with the aim of reducing the amount of metal in the surface part of the ice wall, if necessary, completed above the water surface on the calculated height, feeding water by spraying.

Solid protective shockproof and anti-seepage wall do with a free opening, which after installation of the production platform floating type design position close partially or completely.

After completion of the operation of the well production platform is transported to a new point.

Achievable technical result of the proposed solution allows you to: create a stable protective shockproof and anti-seepage wall, adjustable in size, operating temperature and strength depending on the ice and soil conditions; to reduce the force of impact on the wall of the waves and the moving ice in connection with the formation of a solid landfast ice in the application of artificial freezing; given the effectiveness of freezing to deepen support of the metal piles only weak unconsolidated sediments, if it is confirmed by the corresponding predicted thermal, strength and deformation calculations.

Su is the ability of the invention illustrated by the drawings, where

in Fig.1 shows a diagram of the protective shockproof and anti-seepage wall (top view);

in Fig.2 depicts a fragment a in Fig.1;

in Fig.3 shows the construction and mounting piles in the surface part.

The claimed method in engineering protection of floating production platform type from ice impacts in terms of the Arctic shelf may be carried out as follows.

Prior to the installation of a production platform 3 in the design position (above the hole) and its installation from a floating platform of smaller sizes (not shown)equipped with the equipment for pile driving and compressor unit for a refrigeration system around the perimeter of the platform 3 with a gap set at least one row of supports of metal piles 4 of circular cross section, enclosing the water space 2. Metal piles 4 bury in unstable sediments 7 or bedrock 8. In piles 4 install freezing device 6. Nutricline the cement space. After completion of the construction of the freezing device 6 include in the work, and they must be around piles monolithic cylinders 5 - support of large diameter, logrotate - based and ice - water, which, being closed with neighboring cylinders, formed around the perimeter of the platform solid ledogorov in the ground and ice in the water protective p is tibodeau and impervious wall 1.

Artificial freezing of water and soil around the piles 4 are implementing mounted in piles 4 refrigerating devices of two types: stenogastrinae (not shown)running in the cold period of the year with the use of natural cold and using a system of compulsory freezing, which represents a closed loop of polyethylene pipe 6, connected with the compressor units (not shown). Plastic tube 6 is mounted in a metal pipe (not shown)which are installed in metal piles 4. Under the action of compressor installations plastic tubing 6 moves the liquid refrigerant of low (up to minus 15...20°C) temperature. As a result of heat exchange with the surrounding water and soil environments is the frosting around the piles monolithic cylinder 5 bearings, large diameter, lovrenovic in the ground and ice in the water, which, being closed in Messina space, form a continuous protective shockproof and anti-seepage wall 1. The refrigerant temperature is set in accordance with the desired settings of the protective wall.

In the surface part between the piles 4 arrange horizontal and vertical linkages 9, excluding the horizontal displacement of the pile when ice and wind loads.

The height of the metal piles nad sea level is chosen from the condition of maximum possible displacements of the ice formations and waves relative to the construction site, and it is not less than the sum of the thickness of the ice formations and at least equal to twice the height of the calculated wave area.

In addition, with the aim of reducing the amount of metal 9 in the surface part of the ice wall, if necessary, completed above the water surface on the calculated height, feeding water spray (not shown).

Solid protective shockproof and anti-seepage wall 1 perform with a free opening (Fig.1), which after installation of the production platform floating type 3 in the design position close partially or completely.

After completion of the operation of the well production platform floating type 3 is transported to a new point.

The proposed technical solution used natural-climatic conditions of the Arctic North - low water temperature and outside air, and relatively high values of strength characteristics of arrays artificially nevrogennogo ice and leogrande.

1. Method engineering protection of floating production platform type from ice impacts in terms of the Arctic shelf, including the device around the perimeter of the platform protective building envelope, characterized in that prior to the installation of the platform in the design position on the perimeter of the platform with a gap set at least one OC the supports of metal piles of circular cross section, buried, if necessary, in the bedrock; in piles mounted cooling units and produce artificial freezing of the soil and water around the piles, and formed around the piles monolithic cylinders - logrotate in the ground and ice in the water, should close in Messina space with adjacent cylinders, forming a solid ledogorov in the ground and ice in the water protective shockproof and anti-seepage wall.

2. The method according to p. 1, characterized in that the artificial freezing of water and soil is performed using the system of compulsory freezing, comprising a closed loop of plastic tubing mounted in a metal pipe, which is installed in the metal pile, and compressor installation.

3. The method according to p. 1, characterized in that the artificial freezing of water and soil provide stonecastle cooling devices.

4. The method according to p. 1, characterized in that to provide additional rigidity protective shockproof and anti-seepage wall surface part between the piles are made of horizontal and vertical connections.

5. The method according to p. 1, characterized in that to reduce the volume of metal in the surface protective shock-proof and impervious wall is being built on top of the awn of water on the calculated height, feeding water by spraying.

6. The method according to p. 1, characterized in that the protective shockproof and anti-seepage wall do with a free opening, which after installation of the production platform floating type design position close.



 

Same patents:

FIELD: construction.

SUBSTANCE: cooling device for depth temperature stabilisation of soils of foundations of buildings and structures comprises a tight tubular body with zones of evaporation, condensation and a transport zone between them, made as capable of filling with coolant. At the same time the body comprises a heat exchanger, which includes a pipe of the condensation zone body, a receiver made of a pipe of larger diameter than the diameter of the body, having a plug on top and tightly installed at the end of the pipe of the condensation zone body. The device also includes at least two hollow drainage tubes, the diameter of which is less than the diameter of the body pipe, made with external ribbing, arranged vertically around the pipe of the condenser zone of the body and connected by upper nozzles with a receiver, and by lower nozzles - with a cavity of the gap formed by inner walls of the coupling connecting the lower part of the pipe of the condenser zone of the body with the external support bushing welded to the upper section of the transport zone pipe. The device additionally comprises a receiving bushing made in the form of a section of a pipe of smaller diameter than the diameter of the body connected via an adapter with the lower end of the pipe of the condenser zone and placed partially in the upper part of the pipe of the transport zone of the body with a gap relative to its internal side surface. And the pipe of the body in the evaporation zone is made with alternating cross section and has at least one transition to a pipe of smaller diameter.

EFFECT: increased bearing capacity of soils, simplified installation and dismantling of a structure.

8 cl, 2 dwg

FIELD: heating.

SUBSTANCE: invention relates to devices for controlled temperature stabilisation, cooling and freezing of ground at foundation bases as well as for heat supply of structures on permafrost grounds (in cryolytic zone). Method of year-round cooling, freezing of ground at a foundation base and for heat supply of a structure on permafrost ground in cryolytic zone involves drilling of wells, cooling of ground. All year round, cooling and freezing of the ground of a foundation base are controlled and the year-round partial heat supply of the structure is carried out due to the heat of the foundation base ground and adjacent ground layers that are cooled and frozen. The primary circuit of a heat pump with low temperature heat carrier is formed, the boiling temperature of the heat pump working medium is by 10-30°C lower than the minimal temperature of the heat carrier in the primary circuit. The heat pump is installed inside a structure and heat is supplied with the conversion factor above 1-3. The freezing temperature of the heat carrier in the primary circuit of the heat pump is lower than the minimal temperature of the ambient air of the structure's site up to -60°C. The evaporation temperature of the working medium in the secondary circuit is higher than the lower limit of its working range of temperatures up to -75°C. A thermal well is set in the block of a structure base with bearing piles on the periphery or thermal wells being divided into less powerful ones are set at its periphery along with providing for additional bearing function of a pile. The heat carrier of the divided thermal wells is delivered by heat insulated heating conduits to a common heat exchanger of the heat pump primary circuit or to several heat pumps installed in different rooms of the structure.

EFFECT: guaranteed year-round provision for frozen state of structure foundation base along the whole well depth as well as provision for year-round backing up of part (approximately the half) of structure's thermal load by means of a heat pump due to the usage of heat from the permafrost ground being cooled and frozen.

5 cl, 1 dwg, 3 tbl

FIELD: mining.

SUBSTANCE: ammonia of permafrost thermo stabiliser filling assembly is eliminated by ammonia gas absorption in the system of circulating gas-liquor. Gas-liquor is continuously absorbed at 20-40°C at one step. Ammonia vapour overpressure of 30-100 kPa is created while gas-liquor in concentration of 20-25% is used and discharged into accumulator tanks placed in soil. Heat resulted from dissolution of ammonia gas in gas-liquor is removed via walls of said tank into soil. At a time, fluid level in accumulator tank is controlled. Gas-liquor is forced from accumulator tank to feed fresh water therein as well as precipitated dry salts are discharged therefrom periodically.

EFFECT: higher efficiency, lower costs, power savings.

2 dwg

FIELD: construction.

SUBSTANCE: system for temperature stabilisation of structure foundations on permafrost soils includes a condenser made in the form of a system of pipes, an evaporator, connected with a hydraulic lock and with pipelines, supplying and draining coolant, placed evenly along the entire area of filling of the foundation soil equipped with a layer of heat insulation. Additionally it comprises a buffer-separator arranged under the condenser, which represents a vertically oriented section in the form of three pipes arranged one under another and connected to each other, being horizontally directed, the inner volume of which in total is equal to the volume of the evaporator laid in the foundation soil filling representing parallel coil-like pipes connected by draining pipelines with an upper horizontally separated pipe of the specified buffer-separator equipped with a swirler, the lower horizontally directed pipe of which via a hydraulic lock is connected with the help of pipelines supplying coolant with the evaporator. Coolant used is ammonia or carbon dioxide.

EFFECT: increased freezing and bearing capacity of a foundation, provision of control and monitoring over process of soil freezing and process of system reliability redundancy.

4 dwg

FIELD: construction.

SUBSTANCE: invention relates to devices for seasonal cooling and freezing of soils of building and structure bases in regions of permafrost soils distribution. A thermopile comprises a tight ground capacitor body, filled with vapours of a low-boiling liquid in a saturated condition - a coolant, and having an additional contact of its inner space with atmosphere via a through air duct accessory, an underground part - an evaporator in the form of curvilinear pipelines partially filled with a low-boiling liquid coolant, circulating along ascending and descending branches, arranged in a "cold well" filled with liquid freezing below 0°C, and a transport section of pipelines connecting inner spaces of above-ground and underground parts of the thermopile. The air duct accessory is arranged in the form of a vertical pipe - an air hole, with length and diameter comparable with length and diameter of the body and sufficient for location of the nozzle of the upper end of the pipeline branch in the upper space of the body with an ascending coolant flow, and the "cold well" is arranged in a support pile of the bridge and is filled with an aqueous solution of salt, for instance, NaCl, with concentration providing for the specified temperature of solution freezing and required temperature of soil maintenance in solid frozen condition, on the upper level of the "cold well" filling solution there is a layer of heat insulation with the possibility of free displacement in the inner space of the "cold well" or its compaction in case of solution level deviations.

EFFECT: higher efficiency of a thermopile due to increased intensity of heat exchange in a "soil-atmosphere" system, extension of time of soil keeping in a solid frozen condition around the underground part of the thermopile and reduced labour intensiveness.

3 cl, 2 dwg

FIELD: construction.

SUBSTANCE: method includes tunnelling a through well, stretching of a thermal stabiliser in a direction opposite to the well tunnelling direction, which comprises coolant-charged pipes of the condenser and the evaporator, joined with bellows sleeves that are reinforced by bands. Condenser pipes are arranged along the edges of the thermal stabiliser. Stretching is carried out to the position, in which condenser pipes will be installed above the soil surface. Cooling elements are installed on each of the condenser pipes.

EFFECT: higher manufacturability of the installation process, reduced time of installation, increased reliability, lower cost of installation.

7 cl, 5 dwg

FIELD: construction.

SUBSTANCE: system of soils freezing comprises wells drilled equidistantly along the contour of a mine or a pit. Freezing columns are lowered into wells, and they contain feeding pipes, and brine cooled at a freezing station circulates in the columns. The system of soils freezing also comprises headers that connect the outlet of the freezing columns with the freezing station. The brine is the solution of calcium chloride salt. The brine is cooled at freezing stations with refrigerating machines. Freezing columns are made of titanium-nickel alloy with shape memory effect and initially have tubular cylindrical shape with longitudinal corrugation. Alloy of freezing columns is given phase conversion at critical temperature into cylindrical shape. The system of soil freezing differs from the prototype by improved design of a freezing column, providing for increased resource of freezing columns at cyclic variation of soil temperatures.

EFFECT: increased reliability and efficiency of soil freezing system operation due to usage of deformations that occur in tubular column design made of alloy with shape memory effect with expanded volume of ice and soil barrier.

2 dwg

FIELD: construction.

SUBSTANCE: water-engineering system comprises a soil dam, which forms a water storage pond at the waterway, a water outlet of open type, arranged between the blind parts of the ground dam and an inlet threshold arranged where the waterway enters the pond. At the discharge slope of the dam and at the bottom of the pond cup there is an antifiltering water-impermeable geomembrane made of polymer material. The water outlet is a gabion structure reinforced with lengthy bars and transverse elements made of shaped rolled metal and is enclosed at the bottom and at the sides into a polymer geomembrane. The water outlet geomembrane within its head part to the specified level is coupled with the pond geomembrane in a water-impermeable manner. The inlet threshold is made of gabions joined to each other and forming a solid flexible gabion structure, at the bottom and sides enclosed into a heat-insulation shell and a water-impermeable geomembrane, which is coupled with the pond geomembrane, and by means of a frost curtain - to permafrost soils of foundation and boards. The frost curtain is arranged along the cog filled with the cohesive soil and is made by means of at least one unit, freezing pipes of which are arranged along the cog and are bent. The cooling unit comprises two external heat exchangers and two soil heat exchangers installed at the specified distance from each other. The external heat exchanger represents a tubular expander, which gives heat of the liquid coolant with its natural convection in the unit to the cold outside air. The soil heat exchanger is a freezing pipe arranged in soil and bent along length, and its diametre is less than the diametre of the tubular expander. One freezing pipe is hydraulically communicated with the inlet (head) end to the part of one (first) tubular expander, which is lowest in height, and with the outlet (drain) end - to the middle part of the other (second) tubular expander. The other freezing pipe is hydraulically communicated with the inlet end to the lower part of second tubular expander, and with the outlet end - to the middle part of the first expander. Drain holes of outlet ends of the freezing pipes are arranged at the same level. Method to operate the water-engineering system includes filling of the pond with inflow water to a sage level in warm season of the year, subsequent drain of some inflow water from the pond through the water outlet and water intake from the pond for the user during the year with simultaneous exhaustion of the pond down to the permissible level to the end of the cold season of the year, which is characterised by exceeded intensity of water intake above the intensity of water inflow into the pond. In cold season of the year additional water is supplied into the pond from an adapted source.

EFFECT: increased reliability in development and operation of the water-engineering system.

9 cl, 8 dwg

FIELD: construction.

SUBSTANCE: system for temperature stabilisation of structures foundations on permafrost soils comprising a hydraulic lock, a levelling vessel, connected to a condenser and joined with them by means of pipelines that feed and drain a coolant, an evaporator arranged in the foundation soil fill. It comprises an additional evaporator with a system of pipelines and a hydraulic lock, besides, both evaporators are arranged evenly along the whole area of the foundation soil fill, equipped with a layer of heat insulation, and are joined by means of pipelines by means of their draining ends - to upper points of the levelling vessel, and with feed ends the main and additional evaporators are connected in the lower point of the condenser and the lower point of the levelling vessel, accordingly, via the appropriate hydraulic locks.

EFFECT: increased efficiency and speed of freezing at the initial stage of the system start-up, reduced material intensity.

5 cl, 4 dwg

FIELD: construction.

SUBSTANCE: system for temperature stabilisation of structures foundation on permafrost soils equipped with hydraulic lock, levelling vessel, serially connected to condenser and evaporator arranged in foundation soil fill, joined to pipelines that supply and drain heat medium. It additionally comprises vertical heat-exchangers-evaporators arranged along depth of foundation soil fill, which are made as tube in tube, and their lower ends are plugged, and upper ends are connected directly to evaporator, which is arranged in the form of system of pipes laid in horizontal plane evenly along whole area of foundation soil fill, equipped with a layer of heat insulation joined by means of pipelines by its supply end to condenser and by its drain end - by means of pipelines with a levelling vessel. Height of above mentioned vertical heat-exchangers-evaporators is equal to at least distance "b" between border of depth of "X-X" evaporator arranged in the form of piping system laid in horizontal plane evenly along whole area of foundation soil fill, and upper border of "Z-Z" permafrost soils depth. Lower part of inner pipes of specified heat-exchangers-evaporators arranged concentrically to outer pipes is arranged with perforation, and upper part is arranged as funnel-shaped.

EFFECT: improved reliability, efficiency, operational and technical properties of systems for temperature stabilisation, reduced material intensity.

6 cl, 5 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to development of oil and gas deposits and can be used for anchoring of mining equipment at sea bottom. Proposed method comprises fitting the pile anchor in place by screwing the cylinder in soil, well drilling via wellhead, lowering of reinforced well casing in the well and cementing the string inner space. Note here that casing pipe is pre-furnished with lengthwise sawcuts. Prior to cementing of casing string, charge is lowered to 1.5-2.0 m from well bottom to explode its so that inverted plume is formed in the area if sawcuts as well as cavities in soil to be filled with concrete.

EFFECT: higher reliability of retention.

3 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

FIELD: construction.

SUBSTANCE: invention relates to construction of platforms to mount drilling and oil production equipment in the sea. The support stand-anchor of the marine platform comprises joined upper section with the upper support site, ballast cisterns-sections and the lower drilling section, in which there is a hydraulic engine installed, to the shaft of the rotor of which a drill is connected, and a pipeline of water drain and a nozzle of water drain are connected to the stator of the hydraulic engine. At the same time on the marine platform in the control cabin the system of filling-emptying of ballast cisterns-sections additionally comprises a compressor for compressed air, the outlet of which via serially connected first valves and three-way switching valves are connected to pipelines of compressed air supply, hydraulic pumps. Between ballast cisterns-sections there are remote support sections, the upper section is made in the form of two coaxial hollow cylinders arranged relative to each other coaxially. The upper support site by means of hinge parts rigidly connected to it and the marine platform, may rotate around the common axis of the hinged joint, and with it the entire support stand of the anchor with removal of the bolt joints by means of its transition from the vertical working position into the horizontal transport position.

EFFECT: expansion of functional capabilities of a support stand-anchor and reduction of axial load.

2 dwg

FIELD: construction.

SUBSTANCE: versions are disclosed regarding implementation of designs of a gravity foundation, which comprises the first and second extended foundation sections divided with an open area and made as capable of maintaining weight in water for the specified structure and resting against the bottom of the water area, and an upper section arranged above the specified open area and made as capable of passing at least partially above water surface to maintain the upper structures. Some versions of implementation additionally contain the first and second inclined sections, which connect foundation sections with the specified upper section.

EFFECT: improved design.

20 cl, 8 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 sea gravity platforms for exploration of oil and gas deposits at continental shelf. Proposed platform comprises submersible offshore platform composed by bottom and top bearing plates, sidewalls and internal bulkheads. Bell consisting of separate sections is hinged to submersible platform bottom part. Every said section comprises vertical wall, stiffness ribs and guide pipes. Stiffness ribs have support elements at the points of abutting on bottom plate. Submersible platform sidewalls includes element for attachment of said bell in transport position and recesses to accommodate retainer pints.

EFFECT: higher stability, low draft, fast assembly and disassembly.

5 dwg

FIELD: construction.

SUBSTANCE: platform comprises a support base made in the form of a bottom board with a developed surface, strongly connected with a perpendicularly installed ice-resistant support block, somewhat protruding towards the bottom below the level of the near-bottom plane of the board. At the same time the ice-resistant support block is made in the form of a cylindrical column; special pipes - water-separating columns installed into the ice-resistant support block, through which operating wells are drilled; a superstructure made in the form of three replaceable floating decks with U-shaped cuts in the centre: decks of civil construction purpose, decks of drilling purpose and decks of operational purpose, at the same time U-shaped cuts are made as congruent to the cross section of the ice-resistant support block; detachable lifting mechanisms installed on the outer side along the perimeter of the U-shaped cut of the deck, engagement or disengagement with the support base is provided, as well as movement and fixation of the deck at the safe height of the ice-resistant support block; piles for fixation of the support base drilled with a drilling plant along a curvilinear trajectory provide for safe operation of the structure.

EFFECT: increased reliability of operation and process safety of an area of water during civil construction and drilling works.

3 cl, 3 dwg

FIELD: construction.

SUBSTANCE: support structure of a marine complex, designed for installation in shallow water, is characterised by the fact that it comprises at least two supports installed in shallow water, every support is made of at least one rigid shell closed along the perimetre and filled inside with stone material, besides, the lower shell of the support is installed on the sea bottom, and each of the above installed shells in the lower part is made of smaller size along the perimeter that the perimetre of the upper part of the more lower shell. Besides, at least a part of the upper shell is made with a cone shape. Each support is made as capable of installation of process objects and equipment of the marine complex and placement of elements that combine separate process objects into a whole marine complex between supports. The specified upper shell has a diameter in the range from 30 to 60 metres.

EFFECT: provision of efficient protection against ice and wave loads, reduction of construction time, lower material intensity.

24 cl, 12 dwg

FIELD: construction.

SUBSTANCE: method for coupling of a floating caisson, having funnel-shaped foundation shells, with a base (also with unprepared bottom of a water area), includes fixation of the design position of the floating caisson by means of its installation onto mounting supports or piles and filling with a material of artificial base into internal cavities of the funnel-shaped foundation shells. Actions of base protection (including an artificial one) are implemented from washing with flows of water that washes it.

EFFECT: increased reliability and durability of a base in a floating caisson, increased manufacturability: its coupling with a base.

7 cl, 1 ex, 1 tbl, 6 dwg

FIELD: construction.

SUBSTANCE: shallow-draught self-lifting floating plant comprises a body with an upper deck, a bottom, side walls and supports with lifting mechanisms. Along all or a part of side walls outside the body from the bottom level there are floatage compartments not reaching to the upper deck.

EFFECT: provision of maximum increase of floatage of a plant with minimum increase of its mass, which makes it possible to minimise subsidence of a plant for its operation in shallow areas.

4 dwg

FIELD: mechanics.

SUBSTANCE: device for anchoring floating structures incorporates mooring bar with ends furnished with the appliance to turn the aforesaid rod about its axis of rotation. At that the rod free end is provided with a sleeve letting the chains or cable to pass there through. The anchor chain passed through one of the aforesaid sleeves is fastened at one end faces of the said floating structure. Besides that, to up the structure stability, the proposed device can be furnished with links connecting the free ends of both mooring rods to the structure in question.

EFFECT: anchoring system causing no floating structure trim difference and providing for stable positioning with minor drift, reduced distance between anchor and floating structure.

11 cl, 15 dwg

Up!