CN102359661B - Method for manufacturing and fixing submarine pipeline buckle arrestor on basis of morphological energy adsorption - Google Patents
Method for manufacturing and fixing submarine pipeline buckle arrestor on basis of morphological energy adsorption Download PDFInfo
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- CN102359661B CN102359661B CN 201110241737 CN201110241737A CN102359661B CN 102359661 B CN102359661 B CN 102359661B CN 201110241737 CN201110241737 CN 201110241737 CN 201110241737 A CN201110241737 A CN 201110241737A CN 102359661 B CN102359661 B CN 102359661B
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Abstract
The invention belongs to the technical field of pavement of a submarine pipeline facility and relates to a method for manufacturing and fixing a submarine pipeline buckle arrestor on the basis of morphological energy adsorption. The method comprises the following steps of: manufacturing a pair of semicylindrical shells; cutting off one block from the middle part of one end of each semicylindrical shell and respectively cutting off one block from both sides of the other end of each shell; after abutting the two semicylindrical shells of which interference shells are cut off, fixing the two semicylindrical shells on a submarine pipeline, wherein the end of one shell, at which the middle interference shell is cut off, and one end of the other shell, at which the side interference shells are cut off, are positioned at the same end after being abutted; extending outwards and distributing each interference shell along the direction of the pipeline length and abutting each interference shell with the shells, so that blanks are reserved at the original positions of a novel shell, at which the interference shells are cut off, after the interference shells are abutted with the semicylindrical shells; and fixing each interference shell on the submarine pipeline along both side edges in the direction of the pipeline length. Due to the adoption of a reasonable construction process, the cost is reduced, the phenomenon of buckle propagation of the submarine pipeline is effectively controlled, and the unification of the economy and the safety is realized.
Description
Technical field
The invention belongs to submarine pipeline installation and operation technical field, be specifically related to a kind of making and fixation method that can effectively prevent the buckle propagation of submarine pipeline.
Background technique
Submarine pipeline is oil gas transfer ways important in the Offshore Engineering, and its safe operation is the key of guaranteeing that offshore oil and gas production is carried out smoothly.The deep water submarine pipeline will bear huge hydrostatic pressure because its laying marine site depth of water is larger.Deep underwater pipes is tiled in the bump that weights such as may suffering anchor on the sea bed falls, and this will cause the geometrical defect of self; The low temperature environment of deep water consists of the pipeline internal-external temperature difference with the interior deep fat liquid of carrying of pipe, can produce axial deformation by pipeline; Irrational operation may cause that the curved segment moment of flexure of hanging down is excessive in the pipe laying process; Special ocean environment and the local etching of carrying liquid may consist of pipeline.Above all factors all may cause the cripling conquassation of deep underwater pipes.After the conquassation of pipeline generation cripling, if outer hydraulic pressure surpasses certain pressure, the conquassation form of pipeline will spread to both sides along the pipe range direction, cause the destruction of whole piece pipeline, this phenomenon is exactly the buckle propagation phenomenon, and keeping the needed minimum pressure outside of pipeline buckle propagation is exactly buckle propagation pressure.
Buckle propagation is in case generation will make its termination, and then will possess one of following two conditions: external pressure is down to below the buckle propagation pressure, and perhaps buckle propagation suffers the physical obstacle that it can't pass through.Because the buckle propagation pressure of pipeline generally is significantly less than its flexing collapse pressure, from previous condition, design pipeline take buckle propagation pressure as the stability Design criterion, make the suffered external pressure of pipeline always be lower than its buckle propagation pressure, this will make the wall thickness of pipeline greatly increase, and obviously be very uneconomic.Therefore, effective physical obstacle is set, stops buckle propagation, become the Main Means of reply pipeline buckle propagation problem.The structure of this inhibition buckle propagation is exactly buckle arrestor.
Effectively buckle arrestor can successfully prevent flexing along the propagation of pipeline axial, and the flexing conquassation that pipeline is occurred occurs over just between two buckle arrestors, thereby avoids the whole piece pipeline to wreck.The citation form of buckle arrestor is a thick ring, and current buckle arrestor commonly used can be divided into the formula of buckling into, wrap style and integrated buckle arrestor according to the difference of installation form.The formula buckle arrestor of buckling into is screwed into first the pipeline specified position and then directly clamps, the wrap style buckle arrestor twines at the specified position of pipeline, the internal diameter of integrated buckle arrestor is the same with the internal diameter of pipeline, and the wall ratio pipeline is thicker, and both weld the coaxial joint that sequences afterwards again.On the basis that buckles into the formula buckle arrestor, its with pipeline between be connected and increased the twice weld seam, can form the welding type buckle arrestor.
On the anti-bend performance, the anti-bend effect of integrated buckle arrestor is best, but higher to welding process requirement, complexity is installed, and weight is heavier.Buckle into formula and the welding type buckle arrestor is simple in structure, easily manufactured, but anti-bend efficient is lower, is not suitable for deep underwater pipes.The situation of wrap style buckle arrestor with buckle into formula buckle arrestor broadly similar, also be unsuitable for deep underwater pipes and use.
On the anti-bend principle, three kinds of buckle arrestors all stop buckle propagation by improving the pipeline hoop rigidity, and the reinforcement of this hoop rigidity is evenly carried out along hoop.This uniform ring to reinforced buckle arrestor from desired angle, the form of its anti-bend efficient is no more than integrated buckle arrestor.Therefore, be difficult to further improve the efficient of buckle arrestor based on this former ideal, to adapt to the application of deep underwater pipes.
The deformation form of pipeline flexing conquassation with the energy balance that directly affects in the pipeline buckle propagation process, disturbs the deformation form of flexing conquassation by buckle arrestor, make buckle propagation pass through buckle arrestor and pay higher energy, and this is rational from energy viewpoint.According to the Test data that passes through of the formula that the buckles into buckle arrestor that abroad carries out and integrated buckle arrestor, the buckle arrestor that anti-bend efficient the is lower parallel failure mode of passing through that mostly occurs, and the failure mode of the higher buckle arrestor of anti-bend efficient mainly is that quadrature passes through.Can guess thus: the anti-bend efficient that further improve buckle arrestor, can introduce some to the conquassation morphosis interference of buckle propagation and the factor of inducing action in the buckle arrestor design, make it to pass through buckle arrestor and will occur to pass through the more morphological transformation process of power consumption than quadrature.
At present, also do not have a kind of anti-bend device appearance that improves anti-bend efficient from form energy-absorbing angle, and not lighter than integrated buckle arrestor weight, as to be suitable for deep underwater pipes anti-bend device occurs.
Summary of the invention
For the problems referred to above, the objective of the invention is to overcome the existing technical deficiency of deep water buckle arrestor, design the higher buckle arrestor of a kind of anti-bend efficient from the so new angle of form energy-absorbing, the manufacturing of this buckle arrestor and the method for installing and fixing at submarine pipeline are provided.The present invention reduces cost by taking rational construction process, effectively controls submarine pipeline buckle propagation phenomenon, realizes the perfect unity of Economy and Security.Technological scheme of the present invention is as follows
A kind of submarine pipeline bending arrestor based on the form energy-absorbing is made and fixation method, comprises the following steps:
(1) makes a pair of internal diameter semi-cylindrical shells identical with the submarine pipeline external diameter, form a cylindrical body after two semi-cylindrical shells docking;
(2) adopt axial cutting coupling collar to the mode of cutting, next piece is cut at the middle part of one end of each semi-cylindrical shells, be referred to as the middle part and disturb shell, next piece is respectively cut in the both sides of the other end of each housing, be referred to as side and disturb shell, cut down altogether all identical interference shells of six block sizes and shape from two housings;
(3) be fixed on the submarine pipeline after will having cut two semi-cylindrical shells docking disturbing shell, the cutting of a housing middle part end that disturbs shell and another housing cutting one end of side interference shell after docking, be positioned at same end;
(4) cutting on the semi-cylindrical shells of disturbing shell, disturbing shell to stretch out along the pipe range direction each and arrange and dock the new housing that forms after the docking, the position leaving a blank of interference shell under original cutting with housing; Disturb shell to be fixed on the submarine pipeline along two sides of pipe range direction each.
As preferred implementation, the both sides of each semi-cylindrical shells are provided with for the flank eye plate that buckle arrestor is docked and is fixed on the submarine pipeline.
Technique effect of the present invention has:
(1) the present invention can effectively prevent the propagation of deep water submarine pipeline cripling, guarantees the Security of submarine pipeline, has significant economic value.
(2) buckle arrestor that adopts making method of the present invention to make, respectively form the buckle propagation interference structure that one group of dislocation is arranged in the both sides of pipe range direction, every group of structure disturbs the overhanging arc sheet of shell and upper and lower lobe shell partly to form by 3 arc sheet shapes that are 60 degree angles, they are 120 degree Rotational Symmetry shapes and are cemented on the tube wall, and the housing parts that stretches out outward of the interference shell of every group of interference structure and lobe shell is set up just in time at cloth and staggers.Disturb the overhanging arc sheet part of shell and upper and lower lobe shell all to be welded on the pipeline outer wall along the edges of boards of pipe range direction.This 60 degree interference structures that are 120 degree Rotational Symmetry shapes distributions, the wall thickness that disturbs shell to adhere to has been carried out inhomogeneous hoop rigidity to be strengthened, under this Stiffness Distribution, be easy to bring out pipeline 3,4 rank buckling mode distortion, and the phase mutual interference will occur in this buckling mode distortion with 1,2 rank mode of usually submarine pipeline generation, destroy the stable state of pipeline flexing and propagate, therefore be called interference structure.3,4 rank buckling mode distortion are accompanied by higher cripling pressure, and to this deformation form, buckle arrestor will absorb higher energy with the pipeline conquassation, thereby the pressure that passes through of buckle arrestor is improved.The conquassation form of pipeline mostly is the dog bone type in the Practical Project, but is which part hoop tube wall section contact has occured in the flexing conquassation has a uncertainty actually.Therefore, for the structure of the inhomogeneous reinforcement of hoop rigidity, 120 degree Rotational Symmetries of interference structure distribute, and can more fully catch the buckle propagation of various conquassation deformation directions, thereby improve the validity of interference structure.
(3) buckle arrestor that adopts making method of the present invention to make has formed a reinforcement structure that hoop rigidity is consistent at the middle section of pipe range direction, is called upper and lower lobe shell, is the reinforcement structure division of buckle arrestor.This part is the similar formula buckle arrestor that buckles on the anti-bend principle, difference be the part segmental arc of upper and lower lobe shell along pipe range side protruding 1～2 arc sheet, it and interference shell have formed the interference structure part of buckle arrestor jointly, so that the interference structure of buckle arrestor links to each other with the reinforcement close structure.This layout is so that the effect of interference structure produces the forward coupling with the effect of strengthening structure, and after the effect of flexing process interference structure, its energy will obtain the dissipation of certain degree, and the reinforcement structure that is positioned at like this middle part can more effectively stop buckle propagation.
(4) the present invention is based on the principle design of form power consumption, and carried out inhomogeneous reinforcement for the hoop rigidity of pipeline, this is obviously to be different from current a few class buckle arrestors commonly used.This buckle arrestor is if by dimensionally-optimised design, is aided with the means such as test and carries out deep research and development, is expected to produce surmount whole buckle arrestor, obtains higher anti-bend efficient.
(5) the present invention can be applicable to the pipeline in deep water seabed, interference structure is when preventing buckle propagation, change reynolds' number thereby also can apply certain disturbance to ocean current, so that flowing state enters turbulence state in advance, reach certain inhibition vortex-induced vibration effect.
Description of drawings
Fig. 1 be furnished with the anti-bend device certain section submarine pipeline face projection drawing (wherein buckle arrestor is partly with paper scrap shape pattern fills sign)
Fig. 2 is the sectional view of A-A shown in Fig. 1, and the D-D sectional view is identical with it;
Fig. 3 is the sectional view of B-B shown in Fig. 1, and the E-E sectional view is identical with it;
Fig. 4 is the sectional view of C-C shown in Fig. 1.
Fig. 5 is the downward projection figure with corresponding this section submarine pipeline of Fig. 1;
Fig. 6 is the upward projection figure with corresponding this section submarine pipeline of Fig. 1;
Fig. 7 is the cutting-welding schematic diagram (front view) of epivalve shell;
Fig. 8 is the cutting-welding schematic diagram (plan view) of epivalve shell;
Fig. 9 is the cutting-welding schematic diagram (front view) of hypovalve shell;
Figure 10 is the cutting-welding schematic diagram (worm's eye view) of hypovalve shell;
Figure 11 is the unfolded drawing (overlooking) that signal was made, installed to the epivalve shell;
Figure 12 is the unfolded drawing (overlooking) that signal was made, installed to the hypovalve shell.
The number in the figure explanation:
1 submarine pipeline; 2 disturb shell; 3 epivalve shells; 4 hypovalve shells; 5 connecting bolts; 6 flank eye plates; 7 half heavy wall cylindrical shells
Embodiment
Be described in detail of the present invention below in conjunction with drawings and Examples.
As shown in Figure 1, the present invention includes a pair of upper and lower lobe shell and 6 package assemblies of disturbing shell to form, the coverboard material should adopt and the API 5L X65 type of the identical material of deep water submarine pipeline or more high-grade X70, X80 grade steel.Its main function is to prevent the buckle propagation of submarine pipeline under complex environment and load, guarantees the safety of whole piece pipeline.
Disturb shell to be distributed in the anti-bend device and approximately on the pipe range section of 1～1.5 times of pipe diameter, disturb thick 2～4 times of getting pipeline wall thickness of shell wall along the both sides of pipe range direction.Each side has 3 to disturb housing, every is disturbed the radian of shell to be 60 degree, and take 3 as one group, being 120 degree Rotational Symmetries around the pipeline axle center arranges, and the interference shell distribution of buckle arrestor in pipe range direction both sides is just dislocation, as shown in Figure 3 and Figure 4, they play the effect of the buckle propagation of stable state being disturbed energy-absorbing.Strengthen the purpose of pipeline rigidity for reaching hoop, all disturb housing will weld together with pipeline outer wall along the pipe range direction.
The lobe shell can be divided into the overhanging arc sheet part that is positioned at pipe range direction both sides and the semicolumn housing that is positioned at pipe range direction middle part on function, but two-part are one, as depicted in figs. 1 and 2.The lobe shell has two up and down, and total length is got 4～6 times of outer diameter tube, and wherein the length of overhanging arc sheet part is 1～1.5 times of pipe diameter, and the length of semicolumn housing parts is 2～3 times of pipe diameters, and thickness of the shell is got 2～4 times of pipeline wall thickness.Along the pipe range direction, the overhanging arc sheet part of the same side misplaces with the layout of disturbing shell, also should equate on both length, as shown in Figure 3 and Figure 4.Strengthen the purpose of pipeline rigidity for reaching hoop, the overhanging arc sheet part of all lobe shells also will weld together with pipeline outer wall along the pipe range direction.The semicolumn shell section is the even strengthening segment of hoop rigidity, and the buckle propagation of process interference structure will effectively be stoped in this section, and the flank of semicolumn shell section extends the long strip eye plate, so that upper and lower casing is connected by the eye plate that bolt penetrates flank.
Making, installation method below in conjunction with this kind of description of drawings anti-bend device:
When (1) carrying out the production of this anti-bend device, at first produce one with lobe shell external diameter, half heavy wall cylindrical shell with the flank eye plate that length is identical, shown in parts 7 in Fig. 7～10.It is simple in structure, can use unified mould batch production, and this has reduced manufacture cost.
(2) mode by gas cutting or machine cuts produces interference shell and lobe shell on half heavy wall cylindrical shell, and the mode of gas cutting is used in suggestion.Can find out according to Fig. 1 and Fig. 2, if disturb shell to move a length of disturbing shell to the middle part along the pipe range direction, just can fill up the clear area that the overhanging arc sheet of lobe shell produces, to picking out a heavy wall cylindrical shell.In the cutting process, axially cut first, carry out again the hoop gas cutting.Specifically, hoop 60 degree and 120 degree positions in the axial both sides of half heavy wall cylindrical shell begin to cut, cut out twice length and the slit of disturbing the shell equal in length along pipeline axial, then cut out in opposite directions 1 from the inner in two slits along hoop and disturb shell, perhaps go out 2 along the hoop reverse cut and disturb shell.Consider that the stress that cutting may cause concentrates, the chamfered of disturbing the arc-shaped corner position of shell to be similar to, chamfer radius is controlled at 1/20 times diameter and gets final product with interior, and very high precision needn't be arranged.In addition, corresponding with Fig. 1 and Fig. 2, be different with the direction of the second step of half heavy wall cylindrical shell cutting (being the hoop cutting), a side is that hoop cuts in opposite directions, opposite side then is the hoop reverse cut so.For every half heavy wall cylindrical shell, cutting will obtain a lobe shell and 3 interference shells.
(3) cut interference shell and the lobe shell that produces, on the local deformation of installation occurring affecting, therefore need to carry out the inspection of size, carry out simple Deformation Repair processing to being out of shape serious parts, can be installed on the pipeline outer wall smoothly to guarantee it.The cutting of epivalve shell and welding process are shown in Fig. 7～8, and the cutting of hypovalve shell and welding process are shown in Fig. 9～10.
How shown in Figure 11 upper half part of buckle arrestor (comprise and disturb shell, epivalve shell) launched to obtain schematic diagram along hoop, how shown in Figure 12 lower half portion of buckle arrestor (comprise and disturb shell, hypovalve shell) launched to obtain schematic diagram along hoop, the visual angle of two figure is all overlooked, and namely looks down from the top of buckle arrestor.In Figure 11, first figure is the half heavy wall cylindrical shell that obtains by mould production first when making buckle arrestor, thick dashed line among first figure has been illustrated the position of cutting, second figure is buckle arrestor epivalve shell and three positioned opposite positions of disturbing shells when being installed on the pipeline, thick dashed line among second figure has been illustrated the position of weld seam, show in position shown in the weld seam and disturb shell, epivalve shell to weld with the outer wall position of corresponding pipeline, to strengthen hoop rigidity, improve anti-bend efficient.Upper half part and lower half portion of buckle arrestor are centrosymmetric, and it also is centrosymmetric therefore launching signal Figure 12 and Figure 11.
Device just can be installed after making well.Mounting type is as follows:
Before pipe laying, the lobe shell of making is close on the outer wall of submarine pipeline, and with up and down two-part flank eye plate alignment, be bolted locked, then the overhanging arc sheet part of lobe shell is welded along the pipe range direction, after welding is finished, disturb shell according to mode illustrated in figures 1 and 2 with 6, dislocation is welded on the pipe range direction outside of disturbing anti-bend lobe shell, to weld vertically equally, and then row is laid submarine pipeline, during laying, every 50-100m (deciding on the depth of water and environment) this anti-bend device is set along pipeline axial.
Claims (2)
1. the submarine pipeline bending arrestor based on the form energy-absorbing is made and fixation method, comprises the following steps:
(1) makes a pair of internal diameter semi-cylindrical shells identical with the submarine pipeline external diameter, form a cylindrical body after two semi-cylindrical shells docking;
(2) adopt axial cutting coupling collar to the mode of cutting, next piece is cut at the middle part of one end of each semi-cylindrical shells, be referred to as the middle part and disturb shell, next piece is respectively cut in the both sides of the other end of each housing, be referred to as side and disturb shell, cut down altogether all identical interference shells of six block sizes and shape from two housings;
(3) be fixed on the submarine pipeline after will having cut two semi-cylindrical shells docking disturbing shell, the cutting of a housing middle part end that disturbs shell and another housing cutting one end of side interference shell after docking, be positioned at same end;
(4) on the semi-cylindrical shells of having cut the interference shell, both sides along the pipe range direction respectively form the buckle propagation interference structure that one group of dislocation is arranged, every group of structure disturbs the overhanging arc sheet of shell and upper and lower lobe shell partly to form by 3 arc sheet shapes that are 60 degree angles, they are 120 degree Rotational Symmetry shapes and are cemented on the tube wall, and the housing parts that stretches out outward of the interference shell of every group of interference structure and lobe shell is set up just in time at cloth and staggers.
2. the submarine pipeline bending arrestor based on the form energy-absorbing according to claim 1 is made and fixation method, it is characterized in that, the both sides of each semi-cylindrical shells are provided with for the flank eye plate that buckle arrestor is docked and is fixed on the submarine pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110241737 CN102359661B (en) | 2011-08-22 | 2011-08-22 | Method for manufacturing and fixing submarine pipeline buckle arrestor on basis of morphological energy adsorption |
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| CN 201110241737 CN102359661B (en) | 2011-08-22 | 2011-08-22 | Method for manufacturing and fixing submarine pipeline buckle arrestor on basis of morphological energy adsorption |
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| CN102359661B true CN102359661B (en) | 2013-04-24 |
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| CN108453971B (en) * | 2018-04-08 | 2020-06-02 | 大连理工大学 | Marine flexible pipe cable bending preventer and manufacturing method thereof |
| CN113217752B (en) * | 2021-05-12 | 2022-09-06 | 天津大学 | Buckle-in buckle arrestor with vortex-induced vibration suppression function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DK370977A (en) * | 1977-08-19 | 1979-02-20 | Nordiske Kabel Og Traadfbrikke | SUBSIDIARY LINE AS A CABLE OR PIPE AND WEIGHT LOADING DEVICE FOR USE OF SUCH PIPES |
| NL1001669C2 (en) * | 1995-11-16 | 1997-05-21 | Schelde Maritiem B V | Shock-resistant piping system. |
| CN101696751B (en) * | 2009-11-13 | 2011-01-05 | 天津大学 | Method for preventing buckle propagation and inhibiting vortex-induced vibration of benthal pipeline |
| CN101963257B (en) * | 2010-09-30 | 2013-01-23 | 天津大学 | Method for fixing seabed pipeline and preventing buckle propagation |
| CN102022585B (en) * | 2010-11-17 | 2012-09-26 | 中国海洋石油总公司 | Submarine pipeline buckling preventing device, and manufacturing method and mounting method thereof |
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