Method for forming support substructure for permanent offshore platform

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

 

The invention relates to the field of construction offshore oil hydraulic structures, in particular to the construction of fixed offshore platforms.

There is a method of construction of a spatial lattice structures supporting blocks of fixed offshore platforms with vertical or horizontal position of the reference block on the mounting Assembly site in their manufacture using element-by-element Assembly method "bottom-up" /1/.

The disadvantage of this technical solution is a great complexity and considerable time to produce because of the relatively small volumes of shop works because of the need for gradual implementation of technological operations.

There is also known a method of manufacturing a bearing unit fixed offshore platforms modular method by welding, which are made and consistently connect Assembly elements with the formation of flat constructions panels and diaphragms, the latter will then connect with the connecting pipe parts with the formation of the spatial lattice structure in the form of a prism with riser columns, while the sequence of technological operations are divided into four stages: the first stage is made of tubular parts, the connecting pipe sections and rubye nodes, section piles and riser columns, in the second stage, the Assembly of panels, apertures in the horizontal position on the respective matrices, the third and fourth stages together set the bar and aperture and rigidly connect them with each other and riser columns /2 - prototype/.

Known technical solution has a relatively great savings on intensity and duration of production compared to the way bottom-up" due to complete large volumes of work in a workshop for the Assembly of large components - sections of the panels, diaphragms machine and conductory method in a horizontal position with the formation of the Assembly units, which are then installed in a vertical position.

The disadvantage of this method is the relatively greater complexity of manufacturing pipe spools, which include heat treatment after their manufacturing and installation costs, in particular the need to kantowski reference block from the horizontal to the vertical position.

The aim of the invention is to reduce the complexity, duration and cost of Assembly and installation work by increasing the effectiveness of technology cycles, in particular, eliminating the need kantowski reference block as a whole from the horizontal in verticalnaya, as well as eliminating the need to create a pipe spools as Assembly units and reducing heat treatment of welds.

This goal is achieved by implementing a method of manufacturing a bearing unit fixed offshore platforms modular method by welding, which are made and consistently connect Assembly elements with the formation of flat constructions panels and diaphragms, the latter will then connect through the tube inserts and pipe links with the formation of the spatial lattice structure, while the sequence of technological operations are divided into four stages: the first stage is made pipe sections and pipe insertion section piles and riser columns, in the second stage, assemble flat panels, apertures in the horizontal position on the respective matrices, the third and fourth stages jointly establish a panel and aperture and rigidly connect them with each other, and the second and fourth stages are sequentially installed vertically in position pane, and in the openings between the aperture and rigidly connect them with each other directly and through the spatial relations of the tube elements, while the third stage is installed in a vertical position parallel to each other panel PU is eat lifting rotated around the hinge of each panel relative to the axis of the lower ribs, in the fourth stage between panels set aperture in a horizontal position, then connect the diaphragm and panels by welding and produce winding of the individual parts and Assembly units at the regular places in a closed circuit design with the use of oblique cuts tube elements with angles of cuts, depending on the angles of the pair of connected tubular elements with the formation of a rigid three-dimensional structure.

In addition, in the fourth stage of the Assembly additionally install section leasemanager device and the skirt section of the guides, which are secured with tubular links corresponding to the previously installed racks and diaphragms.

The thickness of the uprights and diameters choose from a condition of acceptance of interrelated structural, construction technology and manufacturing solutions that provide allowable ratio of thicknesses and diameters, eliminating the need for post weld heat treatment of each pipe node.

The proposed solution is illustrated by drawings presented on figure 1-7.

Figure 1 shows the basic block view of an example of the detection Assembly unit. Figure 2-7 - schematic representation of the basic technological operations: figure 2 - the manufacture of pipe inserts, sections piles, riser columns Faso is OK and others, figure 3 - production of panels, figure 4 - installing the panels in a vertical position, figure 5 - attaching them to the panels by means of connecting elements, 6 - installation of diaphragms, 7 - installation leasemanager devices and modules for the auxiliary pile.

The jacket, made by the proposed method is a spatial grid structure prismatic form 1 (figure 1) and contains the following assemblies: pipe parts 2, section skirt rails 3, section leasemanager device 4, a diaphragm 5 with a grate for riser columns and panels 6.

Panel 6 includes vertical posts 7 and are connected by a pipe inserts 8. In the meshed design of prismatic form 1 are riser column 9.

Lattice design of prismatic form 1 is equipped with lesasilny device made in the form of two truncated prisms, consisting of sections 4, made of steel sheet, with beveled side edges rigidly connected big reason among themselves, which are located inside riser column 9. Each of the truncated prisms leasemanager device, consisting of sections 4, is rigidly connected with the tube 2 links of the respective diaphragms 5.

Lattice design of prismatic form 1 contains three panels 6 are connected is between a connecting pipe parts 2, and horizontally spaced apertures 5.

Pile Foundation made multi-section, with each section 3 is rigidly connected to the vertically located, is made of sheet metal with a protective skirt 10, the sides of which are rigidly related to the two guides 11 for piles, with each rail 10 is rigidly connected to the relevant sections of the skirt of the guides 3 and the connecting pipe parts 2 with the side edges of the spatial lattice structure of prismatic form 1.

The proposed method is implemented as follows.

In the manufacture of the support block fixed offshore platforms, large-block method using a weld is made and consistently connect Assembly elements with the formation of flat constructions panels 6 and the diaphragm 5, then the last link with pipe inserts (not shown) with the formation of the spatial lattice structure 1, and the sequence of technological operations are divided into four stages: the first stage is made of pipe components and pipe inserts (Fig, 2), section skirt rails 3 and riser columns 4, at the second stage, the Assembly of the flat panel 6 (3), diaphragm 5 in a horizontal position on the relevant the matrix, on the third and fourth stages are compatible with the on set of the panel 2 and the diaphragm 7 and rigidly connect them to each other (figure 5).

On the second and fourth stages of the Assembly of the flat panel 6 and the diaphragm 5 and the installation of spatial relationships at the regular places provide a direct connection tube elements with straight and curly cuts and the United adjacent tubes with the formation of pipe spools directly in the formation of spatial structures without creating pipe spools as Assembly units in the matrix, and the howling of the individual parts and Assembly units at the regular places in a closed loop is carried out using oblique cuts tube elements with angles of cuts, depending on the angles of the pair of connected pipes.

The third stage is installed in a vertical position parallel to each other panel by lifting rotated around the hinge of each panel 6 about the axis of the lower ribs (figure 4), in the fourth stage between panels 6 set the aperture 5 in a horizontal position, then rigidly connected to the diaphragm and panels by welding (Fig.6).

In the fourth stage of the Assembly additionally install section 4 leasemanager device and partition 3 skirt rails 11, which are secured with pipe elements corresponding to the previously installed racks 7 and diaphragms 5 (Fig.7).

When the thickness of the racks and diameters choose from a condition of acceptance of interrelated structural, Stroitelno technology and manufacturing solutions providing a permissible ratio of thicknesses and diameters, eliminating the need for post weld heat treatment of each pipe node as Assembly units.

A method of manufacturing a bearing unit fixed offshore platform according to the invention allows to increase the economic efficiency of manufacture and installation of the jacket offshore platforms.

The proposed method of manufacturing a bearing unit fixed offshore platform allows to exclude from the technological cycle of production of complex pipe spools so-called ruffs as Assembly units, which are strong stress concentrators that require in their manufacture of special tooling and heat treatment after their manufacture.

Literature.

1. Dawson T. Design of offshore structures. TRANS. from English. - Leningrad: Sudostroenie, 1986.

2. Technical Annex to the contract of the USSR - "ERM, France, volume 8, section 2, Assembly of the bearing unit: - Baku, Plant shipyard production platforms, 1982 prototype.

1. A method of manufacturing a bearing unit fixed offshore platforms modular method by welding, which are made and consistently connect Assembly elements with the formation of flat constructions panels and diaphragms, then the last link with what omashu pipe inserts and tube links with the formation of the spatial lattice structure, meanwhile, the technological sequence of operations is divided into four stages: the first stage is made pipe sections and pipe insertion section piles and riser columns, in the second stage, assemble flat panels, apertures in the horizontal position on the respective matrices, the third and fourth stages together set the bar and aperture and rigidly connect them with each other, and the second and fourth stages are sequentially installed vertically in position pane, and in the openings between the aperture and rigidly connect them with each other directly and through the spatial relations of the tube elements, characterized in that at the third stage is installed in a vertical position parallel to each other panel by lifting rotated around the hinge of each panel relative to the axis of the lower ribs in the fourth stage between panels set aperture in a horizontal position, then connect the diaphragm and panels by welding and produce winding of the individual parts and Assembly units at the regular places in a closed circuit design with the use of oblique cuts tube elements with angles of cuts, depending on the angles of the pair of connected tubular elements, with the formation of a rigid three-dimensional structure.

2. The method according to p. 1, characterized in that the fourth stage of Assembly additionally install section leasemanager device and the skirt section of the guides, which are secured with tubular links corresponding to the previously installed racks and diaphragms.

3. The method according to p. 1, characterized in that the thickness of the uprights and diameters choose from a condition of acceptance of interrelated structural, construction technology and manufacturing solutions that provide allowable ratio of thicknesses and diameters, eliminating the need for post weld heat treatment of each pipe node.



 

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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.

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