Offshore ice-resistant platform
(57) Abstract:The invention relates to the field of hydraulic engineering construction, in particular to the construction of offshore platforms offshore freezing seas. Offshore ice-resistant platform consists of a base with two ice pillars, towering over the water. On ice pillars on the sides directed toward each other are polyspastny blocks. The upper structure is made of floating or is delivered to the pontoons. On the deck of the upper structure are also polyspastny blocks corresponding polyspastny blocks on the outriggers. On the deck of the superstructure near polyspastny blocks are winches, cables which connect polyspastny blocks of the outriggers and the upper structure. After installation and fixing piles (if necessary) to the bottom of the offshore ice-resistant platform prisonerofwar upper structure and enter it between resistant supports. With the help of cables-wires led rope winches in polyspastny blocks outriggers and top of the structure and secure the end of the rope accordingly. When working winches begins the ascent of the upper structure up until his deck will not be flush with the deck of lagostoma expensive floating cranes. 2 C.p. f-crystals, 6 ill. The invention relates to the field of hydraulic engineering constructions, in particular, on the shelf freezing seas for oil and gas.Known hydraulic structure (U.S. patent N 4784526, 1988, MKI E 02 IN 17/02, NCI 405/204), including installation on the bottom of the waters of the ice-resistant supports, attaching them to the piles to the bottom, transportation topside process facilities on floating means, the planting of the upper structure on ice-resistant support and waste water craft. The disadvantage of such hydraulic structures is that they require special precautions.Also known offshore ice-resistant platform (patent RF N 2040638, 1995, MCI E 02 In 17/00), including the upper structure in the form of self-elevating floating platform, mounted on retractable from ice supports struts. The disadvantage of this solution is the need to use self-elevating floating platform.The invention is schematically depicted in the drawings, where Fig.1 shows a General view of the platform of Fig. 2 is a top view (Fig.1), and Fig.3,4 - supply and the rise of the upper structure of Fig.5 - the location of the retractable fingers; Fig.6 - section a-a (Fig. 5).
what's to the bottom of the pile. On the sides of the supports are the outriggers 4,5,6,7, which are polyspastny blocks 8,9,10,11. The upper structure is made in the form of pontoon 12, inside and on the deck there are technological equipment. On the deck of the pontoon are polyspastny blocks 13,14, 15,16, United elements of the flexible connection cables with polyspastny blocks of ice pillars and winches 17,18, 19,20. On the supports, the outriggers and the body of the pontoon is made of slot 21 (Fig.5,6), which can move the fingers 22.Instead sheave sheave pulleys can be installed sprockets, and instead of a cable chain.Offshore ice-resistant platform is used as follows.In magleby period-resistant base is delivered to the installation site and sinks to the bottom. Then is piling (if required) through the ice pillars 2.3 and underwater housing 1. After that, the upper structure in the form of pontoon 12 will riboxinum and slid it between resistant supports. The cable from the winch 17, 18, 19,20 with the help of cables - wires led into polyspastny blocks 8, 9, 10, 11, and 13, 14, 15, 16, and the end of the rope is fixed accordingly.When all four winches 17, 18, 19, 20 produce lift pontoon 12 to it, push the cylinders before putting them into the slots on ice pillars 2, 3. Then the rope winches relax and transmit the entire load on the fingers. Technical and economic advantage of the proposed technical solution is the reduction of construction works in the sea and abandoning the use of expensive floating crane vessels. 1. Offshore ice-resistant platform, including an underwater housing that is attached to the bottom of the pile, and two-resistant supports, installed opposite each other towering above the water, the upper structure with the technological equipment and the nodes connecting the upper structure with ice-resistant platform, characterized in that at the level decks-resistant bearings installed outriggers made on the sides and aimed at each other, which are polyspastny blocks, and the corresponding polyspastny blocks placed on the deck of the superstructure near the winch, through which are passed the flexible connection elements polyspastny blocks of ice pillars and the upper structure, and the nodes are connected in the form of retractable fingers mounted for movement in the slots made in the supports, the outriggers and the housing of the upper structure.rouxeny through pulleys polyspastny blocks.3. Offshore ice-resistant platform under item 1, characterized in that the flexible connection elements made in the form of chains passed through a chain sprocket mounted on polyspastny blocks.
FIELD: hydraulic engineering, particularly building bases and foundations, namely bridge piers, in water.
SUBSTANCE: method involves monitoring water obstacle in support building place, including investigating water parameters, recording water level in the course of year, determining floor shape, investigating floor ground, influence of outer disturbing forces and calculating weight and dimensions of support foundation case on the base of above parameters; producing hollow case with several cavities; moving case to installation place; submerging case in water; pacing thereof on floor; fixing case by piles and smoothing floor. Case submerging and placing operations are performed simultaneously with stabilizing vertical case position by performing control and filling of corresponding cavities. Bottom smoothing process is carried out by forcing artificial material, such as concrete layers with crushed stone interlayers, under case bottom. During case placing case is secured by blades built in case bottom and by piles inserted in cavities. Correspondence between case weight, number of blades, head resistance and side friction thereof for particular ground is determined to provide case stability on ground. Upper edge of submerged case is located above maximum possible water wave height. Rock fill is formed around underwater case part.
EFFECT: reduced time of support erection, increased reliability and stability, safety and service life, reduced labor inputs, possibility to erect supports in Arctic basin.
3 cl 1 ex
FIELD: stationary sea oil platforms.
SUBSTANCE: block has underwater support, made in form of two-level bench, formed by vertical beam cases and horizontal links, and also has support columns, connected to support. Horizontal links of bench are made in form of floating tanks, while links, placed along perimeter of lower level of bench, are separated by water-impenetrable walls on sections, provided with ballasting means. Method for mounting support block at the bottom of continental shelf includes transporting, ballasting of floating tanks and fixing support block at the bottom of water body. Support block is transported into wells drilling zone in planned position, sections of floating tanks are ballasted until lower level of support lowers into bottom of water body for 0.3-0.7 of its height, different and slants are evened and holding beams are inserted into cases of support with their following forcing into hard bottom portion and fixing in cases. Ballasting of sections of floating tanks and forcing of holding beams can be performed in pairs in diagonal planes relatively to center of lower level of support.
EFFECT: simplified assemblage, higher reliability.
2 cl, 12 dwg
FIELD: hydraulic engineering, particularly for forming temporary structures for enclosing closed in plane water area bottom part and space above the bottom part through the full water thickness.
SUBSTANCE: method of shallow tunnel construction involves forming structure enclosing closed in plane bottom part; removing water from the structure; performing works in dry structure and demounting above structure. Method of enclosing structure forming involves producing bottomless hydraulic enclosure with controlled floatability; transporting and moving thereof to tunnel path; immersing the enclosure in water up to reaching water area bottom by reducing floatability thereof and fixing enclosure with fastening means and anchor system; leveling upper enclosure part with horizon line and arranging cranage and platforms for building material storage on upper enclosure part; erecting cutoff walls inside space defined by enclosure; removing water from the enclosure; developing bottom ground by trench digging; constructing pile tunnel base; building foundation grill on pile tunnel base; locating composite or precast reinforced concrete tunnel sections on foundation grill; recovering initial floatability of the enclosure. Enclosure structure has movable fastening means formed as blades along vertical walls thereof.
EFFECT: increased tunnel reliability, reduced time of erection thereof.
4 cl, 4 dwg
FIELD: production of ice.
SUBSTANCE: method comprises producing a hollow near the ship's side, delivering air under the ice cover, the air volume does not exceeding the volume of the space defined by ice covering from the top, water from the bottom, and ice walls from the sides over the contour of the future hollow. The walls are frozen from top to bottom by means of direct nonseparable heat exchangers mounted in advance into the covering immediately behind the contour up to the bottom of the future hollow. The delivery stops and the bottom of the future hollow is frozen with the use of L-shaped nonseparable heat exchangers set into the covering simultaneously with the direct heat exchangers. As a result, a closed space is defined, which is stripped, and ice blocks are removed.
EFFECT: enhanced efficiency.
FIELD: hydraulic engineering, particularly underwater structures adapted for oil and gas well operation, preferably on shallow continental shelf having bottom covered with thick silt layer and in ice-covered period.
SUBSTANCE: platform comprises base, vertical pile holders connected with the base and positioning unit for drilling string and well-control equipment fixation. Base is formed as a structure with cavities filled with ballast. The structure is composed of hollow members and functionally divided into two areas. Positioning unit is arranged in the first area, another area including catching opening. Platform is additionally provided with removable mounting frame with production equipment installed on the frame. Arranged in lower frame part are inclined guiding means to provide access into catching opening during mounting frame connection with support platform base in underwater position.
EFFECT: reduced labor inputs for production equipment mounting and maintenance, increased reliability.
FIELD: offshore oil-field hydraulic structures, namely for building fixed platforms.
SUBSTANCE: support substructure comprises three-dimensional latticed structure having prismatic shape and composed of tubular members. The structure has vertical panels with posts, cross-pieces, struts and horizontal diaphragms connected one to another. Horizontal diaphragms have guiding nets for marine risers. The structure is secured to ground by main piles arranged in vertical posts and by foundation having additional piles, which is rigidly connected to tubular members of side edges of above structure. The structure is provided with ice-protection means formed as two truncated prisms of sheet steel and having beveled side ribs rigidly connected one to another by major bases. Marine risers are arranged inside prisms. Each prism of ice-protection means is rigidly connected with tubular members of corresponding diaphragms of three-dimensional latticed structure.
EFFECT: increased resistance to wave, seismic and ice loads, improved manufacturability and, as a result, reduced cost of permanent offshore structure building.
3 cl, 2 dwg
FIELD: offshore oil-field hydraulic structures, namely for building fixed platforms.
SUBSTANCE: method for forming support substructure by welding large blocks involves producing and serially connecting precast members to create flat units, namely panels and diaphragms; connecting flat units by tubular inserts and tubular links to create three-dimensional latticed structure. All operations are divided into four stages in accordance with technological order. The first stage includes forming tubular links and tubular inserts, pile sections and marine riser sections. The second stage includes assemblage of flat panels and diaphragms in horizontal position on corresponding mats. The third and the forth stages include simultaneous installation of flat panels and diaphragms and rigid connection thereof.
EFFECT: reduced labor inputs, time and cost for assembly work performing due to elimination of complicated tubular joints used as assembly units.
3 cl, 7 dwg
FIELD: ground hydraulic structure erection, particularly to decontaminate silt or bottom sediments in water bodies.
SUBSTANCE: method involves building protective dam along perimeter of silt and/or bottom sediment area to be protected; laying waterproofing layer along inner dam perimeter, wherein waterproofing layer height is 2 times as much as silt and/or bottom sediment layer; forming artificial ground massif of watertight ecologically friendly natural ground in water area inside the dam, wherein artificial ground massif thickness is equal to at least three thicknesses of silt and/or bottom sediment layer; forming above-water relief area having 2.5 m height over water surface; forming surface flow discharge system and planting greenery in artificial ground massif.
EFFECT: increased reliability, reduced contamination concentration, prevention of hazardous substances ingress in ambient space and improved ecological safety.
2 cl, 1 dwg
FIELD: marine hydraulic structures, particularly fixed marine oil and gas production platforms.
SUBSTANCE: method for pile installation with the use of handling machine involves driving each pile in conical hole made in guiding means fixedly secured to marine platform base; installing pile and guiding means in coaxial position by guiding device having body installed on guiding members of the base so that the body may be displaced and fixed in predetermined position; lowering pile to working position; installing guiding device above water level on guiding members of platform base in predetermined position, wherein the guiding device is made as cylindrical body part and cylindrical part of guiding member secured one to another and having crossing axes so that cylindrical part of guiding means and cylindrical part of guiding member of guiding device are brought into coaxial state by corresponding linear and angular guiding member displacement; securing guiding device body with guiding members of platform base.
EFFECT: extended technological capabilities and simplified method of pile installation in working position.
5 cl, 4 dwg
FIELD: marine oil production hydraulic structure building, particularly marine platform assemblage.
SUBSTANCE: method involves forming assembly units, namely support unit, load-bearing deck and block units of upper structure, at subassembly site; docking floating vehicle to subassembly site; serially installing assembling units on stockpile carts; moving assembly units from subassembly site to floating vehicle with the use of above stockpile carts; transporting thereof to assemblage site and performing successive mounting thereof with the use of crane-and-mounting ships. The successive mounting operation involves installing support unit on previously prepared ground; installing piles in corresponding bell-shaped guiders of the support unit; driving the piles and cementing thereof to create pile foundation; arranging load-bearing deck on struts and installation guiding bars having different heights and previously formed on support unit, wherein the load-bearing deck has seats for struts and bars receiving and connection thereof is carried out by successive alignment of above bars and seats.
EFFECT: increased efficiency of building equipment and floating vehicle usage; reduced building time, decreased number of operations to be performed at sea, reduced labor inputs and decreased costs of marine fixed platform building.
7 cl, 17 dwg