The method of installation of the marine jack-up platform
(57) Abstract:The invention is intended for use in the field of hydraulic structures, in particular in the construction of offshore Jack-up platforms. In the method of installation of the marine Jack-up platform before mounting supports produce the reception of ballast in the tank outriggers platform, equal to the weight of the supports, and then gradually flood the lower compartments of support until it is brought into the vertical position in which it floats. Then, on a support having a rope from the mooring platform mechanism and pull her to Board the platform in the area of the outrigger, and after subsequent zastrocky support to the hook of the lifting means through the shaft tripping mechanism produce ballasting support to the zero buoyancy. Then continue ballasting to full flooding, while bearing will not hang on the hook of the lifting means whereby it may be tightened to the chassis platform. Then in the presence of currents additionally Ballesteros support before making its vertical position. After this column sucked into the shaft to engage with the tripping mechanism of the platform, and after leaving the top of the support from the water track roll and differ obespechenie marine installation fully assembled bearings with housing platform without the use of additional pontoons. 1 C.p. f-crystals, 3 ill. The invention relates to the field of hydraulic structures and can be used in the construction of offshore Jack-up platforms.There is a method of construction of offshore Jack-up platform on author. mon. USSR N 380825, CL 6 E 21 B 15/02, 1973, including the use of special pontoon with mine, which holds and secures the support section, then the pontoon ballustrade and is brought under the bottom of the marine Jack-up platform, the support section is introduced into the mine, then the pontoon deballasted and together with the support section rises to bearing pontoon under the bottom of the marine Jack-up platform. The support section is inserted into engagement with the tripping mechanism of the platform, then the lower part of the section is exempt from the pontoon, and the cycle is repeated until the entire Assembly support.The disadvantage of this known method is the considerable complexity and difficulty of ballasting and input section supports the shaft of the platform.There is also known a method of installation of the marine Jack-up platform, which includes building the platform with outriggers and anchor-mooring arrangements, Assembly, joining and welding the sections of the supports is making its vertical position, slinging the latter to the hook of the lifting means through the shaft tripping mechanism of the platform and its winding in said shaft and hoist lifting means to engagement with the tripping mechanism of the platform (see application for a patent for invention N 94027532/13 from 20.07.94, which has a solution of VNIIKP for a patent from 29.05.96 - prototype).The disadvantage of the prototype is considerable complexity due to the necessity of making additional pontoon, its mounting on the support and subsequent dismantling.The technical result of the proposed method of installation of the marine Jack-up platform is providing offshore installation fully assembled bearings with housing platform without the use of additional pontoons.This is achieved in the method of installation of the marine Jack-up platform, which includes building the platform with outriggers and anchor-mooring arrangements, Assembly, joining and welding the sections of the supports, towing fully assembled support to the point of connection with the body in deep water, ballasting support before making its vertical position, slinging the latter to the hook lifting money through the mine spellane with the tripping mechanism of the platform, before mounting the supports to produce the reception of ballast in the tank outriggers platform, equal to the weight of the supports, and then gradually flood the lower compartments of support until it is brought into the vertical position in which it floats, then support get the rope from the mooring platform mechanism and pull her to Board the platform in the area of the outrigger, and after subsequent zastrocky support to the hook of the lifting means through the shaft tripping mechanism produce ballasting support to the zero buoyancy, then continue ballasting to full flooding, while bearing will not hang on the hook of the lifting means whereby it may be tightened to the body of the platform, then in the presence of currents additionally Ballesteros support before making its vertical position, after which the column delay in the mine prior to engagement with the tripping mechanism of the platform, and after leaving the top of the support from the water track the roll and pitch of the body and produce the pumping replacement prop ballast.The claimed method is illustrated by drawings, where Fig. 1 illustrates schematically bearing, side view (casting-off afloat). In Fig. 2 - scheme of the platform installation - training support to the institution in mines is blowing.When ready case 1 platform 2 outriggers and anchor-mooring arrangements 3 is transported to the installation site by tugs (not shown), a support 4 in a horizontal position launchable singly and towed to the installation site.Before mounting supports 4 produces the reception of ballast in the tank outriggers 2 platform, equal to the weight of the supports 4.Then make gradual flooding of the lower compartments 5 of the support 4 by known methods, for example by opening the kingstons compartments 5 a diver, until it is brought into the vertical position in which it floats.Upon completion of the rolling bearings 4, caused by dynamic processes kantowski, the support 4 by means of a tow 6 down to the platform in the area of the outrigger 2, is slid on her rope 7 from anchor-mooring mechanism 3 and tighten it to the Board last. After this cargo sling 8 from the hook 9 of the lifting means (not shown) is passed through the shaft lifting mechanism 10 platform and consolidate the support 4, disconnect the rope 7 and produce ballasting support 4 to zero buoyancy through a hose (not shown), after which the ballasting continue to full flooding, while bearing 4 is hung on the hook 9 gruop niteline Ballesteros support 4 by divers prior to the adoption of its vertical position, then support 4 tighten the shaft to engage with the lifting mechanism 10 platform, and after leaving the top of the support 4 from the water track the roll and pitch of the housing 1 and produce a pumping replacement prop ballast. After bearing 4 completely passed the mechanism 10, it is placed at the position of travelling.After repeating the above operations for the other two supports 4 mounting platform is completed and it returns to the completion of the project plant-Builder.The marine installation fully assembled bearing in the shaft housing from under the water by the present method is a unique operation, which up to the present time anywhere in the world is not performed.The applicant developed technical documentation for installation of supports for the present method in the construction of the rig "Arctic". 1. The method of installation of the marine Jack-up platform, which includes building the platform, Assembly, joining and welding bays supports, towing fully assembled support to the point of connection with the body in deep water, ballasting support before making its vertical position, slinging the latter to the hook lifting money through the mine Ceplene with the tripping mechanism of the platform, characterized in that the hull of the platform do with anchoring and mooring arrangements and outriggers, the latter of which have a tank for the reception of ballast, while before installation supports produce the reception of ballast in the tank outriggers platform, equal to the weight of the supports, and then gradually flood the lower compartments of support until it is brought into the vertical position in which it floats, then support get the rope from the anchor-mooring platform mechanism and tighten it to the Board in the last area of the outrigger, and after further zastrocky support to the hook of the lifting means through the shaft tripping mechanism produce ballasting support to the zero buoyancy, then continue ballasting to full flooding, while bearing will not hang on the hook of the lifting means whereby it may be tightened to the body of the platform and then sucked into the prop shaft to engage with the tripping mechanism of the platform, and after leaving the top of the support from the water track the roll and pitch of the body and produce the pumping replacement prop ballast.2. The method according to p. 1, characterized in that in the presence of currents additionally Ballesteros support to make it vertical
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