CN100532901C - Submerged pipeline air guide sleeve and its production and fixing method - Google Patents
Submerged pipeline air guide sleeve and its production and fixing method Download PDFInfo
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- CN100532901C CN100532901C CNB2008100520829A CN200810052082A CN100532901C CN 100532901 C CN100532901 C CN 100532901C CN B2008100520829 A CNB2008100520829 A CN B2008100520829A CN 200810052082 A CN200810052082 A CN 200810052082A CN 100532901 C CN100532901 C CN 100532901C
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Abstract
The invention relates to an undersea pipeline guide cover which is a symmetrical shell which is connected by two convex tops in the middle. The invention is spliced by four tongue-shaped guide pieces which has the same size and bending radian; each guide piece is gradually thinned from the bottom edge to the top; the bottom edge is provided with a square-wave incision; the external wall of the guide piece is fixed with a Z-shaped torrent wire; the square-wave incision of each guide piece is matched with the square-wave incision of the guide piece which is spliced by the square-wave incision of the guide piece at the bottom edge. The invention also relates to a manufacture and fixing method of the guide cover. The manufacture and fixing method of the undersea pipeline guide cover which is provided by the invention effectively controls a vortex-induced vibration, has moderate complexity of the construction process, keeps the construction cost in an acceptable range, and realizes the optimization between the factors of process complexity, manufacture cost, the restriction effect of the vortex-induced vibration, etc.
Description
Technical field
The invention belongs to submarine pipeline facility laying technology field, be specifically related to a kind of device that can effectively suppress submarine pipeline vortex-induced vibration.
Background technique
Undersea pipe-laying is on rugged sea bed, since the acting in conjunction of factors such as the nonuniformity of sea bed profile and sea bed underflow, morning and evening tides, some zone on the pipe laying path, and exposed tube forms unsettled section outside.Under the long term of environmental load, unsettled section as easy as rolling off a log destruction and losing efficacy.In various failure modes, the highest and harmfulness is maximum with the probability of occurrence of vortex-induced vibration.Vortex-induced vibration refer to the cycle of vortex come off cause act on the object laterally and flow to alternation external force, cause object vibration.Academia is consistent, and to think transverse vibration more much bigger than flowing to vibration, and the vortex granting is the basic reason that causes vortex-induced vibration, below at first sketches unsettled section vortex of pipeline and provide mechanism.
The submarine pipeline section adopts the circular cross-section form usually, when ocean current during through unsettled section, because seawater has viscosity, then forms the boundary layer at unsettled section surface with certain data rate stream.The friction shear stress that exists in the boundary layer makes fluid dynamic energy descend significantly, and very easily fluid rate occurring a unsettled section side that flows dorsad is 0 situation, the fluid stagnation at this place not before.Meanwhile, downbeam pressure nearby is the pressure at 0 place greater than near the flow velocity unsettled section surface, and near fluid flows to unsettled section under the effect of pressure gradient like this, the boundary layer occurs and exsomatizes, and forms the adverse current zone, and then the vortex granting occurs.
According to the Classical Fluid Mechanics theory, if the sectional shape of object is streamlined, the stripped phenomenon in boundary layer can not appear when then viscous fluid is flowed through body surface, reduced the possibility that the vortex granting occurs significantly.Based on this principle, approximate streamline section pipeline arises at the historic moment, and this is wherein the most representative with elliptic cross-section.But, pipeline add the big and initial investment of difficulty in man-hour and maintenance cost higher.
In addition, the vortex granting also is subjected to the influence of boundary layer flow state except relevant with the sectional shape of aforementioned object.When the flowing state in the boundary layer was laminar flow, the pulsating nature of speed was less, thereby the also less effect that is not enough to resist negative pressure gradient of fluid dynamic energy, occurred the boundary layer easily and exsomatized, and produced vortex; When the flowing state in the boundary layer is turbulent flow, velocity distribution is plentiful and have a bigger pulsating nature during than laminar flow, thereby fluid dynamic energy is enough to resist the effect of negative pressure gradient more greatly, the stripped point in boundary layer is passed towards downbeam, reduce vortex granting district, and then effectively reduced the alternating stress amplitude that the vortex granting is induced.Thereby, should consider when reynolds' number is in the laminar flow reynolds number range how can apply certain disturbance to fluid, make flowing state enter turbulence state in advance, thereby reach the purpose of effective alleviation vortex-induced vibration adverse effect.There are some researches show that abroad pipe surface sets up the vortex-induced vibration that porous layer can effectively suppress the high reynolds number fluid.This method is very high to the corrosion resistance requirement of porous layer material, still is in the laboratory applications stage.
Summary of the invention
The present invention is intended to overcome the above-mentioned deficiency of prior art, the device that can effectively suppress vortex-induced vibration is provided, and the method that a kind of making of this device is provided and on submarine pipeline, fixes, make under the prerequisite that vortex-induced vibration is effectively controlled, moderate and the construction cost of the complexity of construction process maintains in certain tolerance interval, realizes that process complexity, cost and vortex-induced vibration suppress the optimization between the factors such as effect.
For this reason, the present invention adopts following technological scheme:
A kind of submerged pipeline air guide sleeve, symmetrical housing for middle part projection two tops connection, be spliced by four sizes, ligule guide plate that crooked radian is identical, thickness direction from guide plate, every guide plate is gradually thin from the base to the top, the base has square wave shape otch, is fixed with Z font torrent silk on the outer wall; The square wave shape otch of every guide plate with match with the square wave shape otch of its guide plate that splices mutually on the base.
As preferred implementation, above-mentioned submerged pipeline air guide sleeve is provided with at least one waling at the inwall of every guide plate, looks from the end face direction of guide plate, and every stiffening rib is thicker near head portion, and is thinner near the base part.Air guide sleeve has the external diameter of desirable 0.5-1 times of pipeline of width on the base of otch, the external diameter of crow flight distance desirable 0.6-1.5 times pipelines of every guide plate from the top to the base.
The present invention provides a kind of making and fixation method of above-mentioned air guide sleeve simultaneously, comprises the following steps:
(1) according to the inside/outside diameter size of claimed submarine pipeline, make two pairs of sizes, ligule guide plate that crooked radian is identical, from the thickness direction of guide plate, every guide plate is gradually thin from the base to the top, the base has square wave shape otch, is fixed with Z font torrent silk on the outer wall; Each square wave shape otch to the guide plate base matches.
(2) first guide plate is attached to pipeline one side according to the tangent position of base and submarine pipeline, in the indent of base square wave shape otch with itself and pipe surface welding;
(3) take second guide plate that matches with described first guide plate base, dock with first guide plate in place according to the recess position, and its indent and pipe surface at its base square wave shape otch is welded;
(4) first and second guide plates being carried out spot welding in the incision of butt joint connects;
(5) the 3rd guide plate is attached to the opposite side of pipeline according to the tangent position of base and submarine pipeline, to (4), other two guide plates is welded on opposite side and described first and second positions that guide plate is symmetrical of pipeline according to above-mentioned steps (2);
(6) will be by two tops spot welding connection respectively of the air guide sleeve that constitutes after two pairs of guide plate butt joints.
As preferred implementation, the making of above-mentioned submerged pipeline air guide sleeve and fixation method are provided with at least one waling at the inwall of every guide plate, from the end face direction of guide plate, every stiffening rib is thicker near head portion, and is thinner near the base part.The width that the middle every guide plate of making of step (1) has the base of otch is preferably got the external diameter of 0.5 11 times of pipelines, the external diameter of crow flight distance desirable 0.6-1.5 times pipelines of every guide plate from the top to the base.
The present invention proposes a kind of streamlined air guide sleeve, than traditional circular cross-section form, the present invention has following advantage: (1) adopts airflow design, air guide sleeve and pipe surface are carried out spot welding to be connected, in the position that air guide sleeve is set, the diversed cover of pipe surface wraps up, the section form of this composite structure is for approximate streamlined, this structure can effectively delay the vortex granting, make position that vortex comes off away from pipe main body, reduce failure modes such as fatigue that vortex-induced vibration causes, fracture unsettled section adverse effect.Locate at unsettled section that air guide sleeve is not set, vortex-induced vibration very likely occurs, but act on the alternating force that the total alternating force on unsettled section is born less than the equal unsettled length pipeline that does not add any protective measure.(2) the present invention sets up the torrent silk of Z font layout to strengthen the inhibition effect to vortex-induced vibration on the air guide sleeve surface.When reynolds' number is in the laminar flow reynolds number range, apply certain disturbance to fluid, make flowing state enter turbulence state in advance.(3) set up after the air guide sleeve, the natural frequency of pipeline air guide sleeve composite structure changes, make the critical suspended length of critical span length (suspended length when vortex is provided frequency and equaled structural natural frequencies) pipeline when not applying the air guide sleeve structure of this structure, this means that the possibility that resonance takes place composite structure has descended.
Description of drawings
Fig. 1 is the stereogram after an air guide sleeve is assembled and is fixed on the pipeline;
Fig. 2 is the interior wall construction schematic representation of a slice guide plate;
The interior wall construction schematic representation of the guide plate that Fig. 3 matches with the bottom of guide plate shown in Figure 1;
Fig. 4 is the outer wall construction schematic representation of guide plate shown in Figure 2;
Fig. 5 is Fig. 2 and structural representation after two guide plates shown in Figure 3 are connected;
Fig. 6 is the sectional drawing of guide plate at the stiffening rib place;
Fig. 7 is the sectional drawing of pipeline and air guide sleeve composite structure;
Fig. 8 is the plan view of pipeline and air guide sleeve composite structure.
The number in the figure explanation:
1 pipeline; 2 air guide sleeves; 3 stiffening ribs; 4 have the base of square wave shape otch; 5 tops; 6 torrent silks; 7 guide plates
Embodiment
Below in conjunction with drawings and Examples the present invention is further described.
Stereogram after an air guide sleeve is assembled and is fixed on the pipeline as shown in Figure 1, air guide sleeve of the present invention is the symmetrical housing that is connected by middle part projection two tops 5 that four sizes, ligule guide plate 7 that crooked radian is identical are spliced.After the installation, the inwall of middle part convex portion is that tangent line and pipeline 1 are tangent with the base 4 of the guide plate 7 after docking, and is welded on the pipeline 1.The position that 4 guide plate 7 tops 5 join also welds together.Every guide plate 7 sheet material corrosion-resistant by steel plate or other and that have certain intensity forms through cutting with bending.
Every guide plate 7 shape are crooked ligule, are similar to the isosceles triangle that cuts down from the cylndrical surface, and its base 4 is parallel with the symmetry axis of cylndrical surface, and 4 is 5 gradually thin to the top from the base, and base 4 has square wave shape otch.Fig. 2 and Fig. 3 are the interior wall construction schematic representation that concave surface one side from guide plate 7 looks.Be welded with stiffening rib 3 on the inwall to increase the rigidity of air guide sleeve 2, preventing that it from deforming under the effect of deep water high pressure influences the water conservancy diversion effect.Stiffening rib 3 adopts and becomes the Form Factor design as shown in Figure 6, less near guide plate 7 bases 4 one end sizes, increases gradually near guide plate 7 tops its size of 5 parts.On the outer wall of guide plate 7, also be welded with Z font torrent silk 6, as shown in Figure 4.
Fig. 5 is the structural representation after Fig. 2 and two guide plates shown in Figure 3,7 butt joints, and 4 square wave shape incision is and inserts finger-like and connect on the base for two guide plates 7.Be buckled together again after two pairs of guide plates 7 dock respectively, just can be spliced into the flat symmetry housing that middle part projection two tops 5 as shown in Figure 1 connect.Sectional drawing after air guide sleeve 2 is installed on the submarine pipeline 1 and plan view are shown in Fig. 7 and 8.
Between 4 guide plates 7 and and pipeline 1 between connecting means as follows: a slice guide plate 7 that at first will be as shown in Figure 2 is attached to pipeline 1 one sides according to the tangent position of base 4 and pipeline 1, the indent of 4 square wave shape otch is with itself and pipeline 1 surface soldered on the base, then guide plate shown in Figure 37 is docked and it is welded in indent and pipeline 1 surface with guide plate 7 in place according to the recess position, then, two guide plates 7 carry out the spot welding connection in incision.Two guide plates 7 place pipeline 1 below in addition, and its position and preceding two guide plates are symmetry about in the of 7, and welding in an identical manner.At last, with guide plate 75 positions employing spot welding connections of joining up and down on the top.Jiao Cuo welding manner can make the vertical midship section both sides of pipeline 1 occur two pairs of measure-alike little welderings respectively to meet like this, and balance is because pipeline 1 distortion that welding residual stress causes to a certain extent.The width of air guide sleeve 2 (being the length that otch base 4 left by guide plate 7) is got the external diameter of 0.5-1 times of pipeline 1, and the distance of every guide plate from the top to the base got the external diameter of 0.6-1.5 times of pipelines.The spacing of air guide sleeve 2 on pipeline 1 got 3-5 times of air guide sleeve 2 width.
Claims (6)
1. submerged pipeline air guide sleeve, symmetrical housing for middle part projection two tops connection, be spliced by four sizes, ligule guide plate that crooked radian is identical, thickness direction from guide plate, every guide plate is gradually thin from the base to the top, the base has square wave shape otch, is fixed with Z font torrent silk on the outer wall; The square wave shape otch of every guide plate with match with the square wave shape otch of its guide plate that splices mutually on the base.
2. submerged pipeline air guide sleeve according to claim 1 is characterized in that, is provided with at least one waling at the inwall of every guide plate, and from the end face direction of guide plate, every stiffening rib is thicker near head portion, and is thinner near the base part.
3. submerged pipeline air guide sleeve according to claim 1 and 2 is characterized in that, the width that air guide sleeve has a base of otch is got the external diameter of 0.5-1 times of pipeline, the external diameter of crow flight distance desirable 0.6-1.5 times pipelines of every guide plate from the top to the base.
4. the making and the fixation method of the submerged pipeline air guide sleeve shown in the claim 1 is characterized in that, comprise the following steps:
(1) according to the inside/outside diameter size of claimed submarine pipeline, make two pairs of sizes, ligule guide plate that crooked radian is identical, from the thickness direction of guide plate, every guide plate is gradually thin from the base to the top, the base has square wave shape otch, is fixed with Z font torrent silk on the outer wall; Each square wave shape otch to the guide plate base matches.
(2) first guide plate is attached to pipeline one side according to the tangent position of base and submarine pipeline, in the indent of base square wave shape otch with itself and pipe surface welding;
(3) take second guide plate that matches with described first guide plate base, dock with first guide plate in place according to the recess position, and its indent and pipe surface at its base square wave shape otch is welded;
(4) first and second guide plates being carried out spot welding in the incision of butt joint connects;
(5) the 3rd guide plate is attached to the opposite side of pipeline according to the tangent position of base and submarine pipeline, to (4), other two guide plates is welded on opposite side and described first and second positions that guide plate is symmetrical of pipeline according to above-mentioned steps (2);
(6) will be by two tops spot welding connection respectively of the air guide sleeve that constitutes after two pairs of guide plate butt joints.
5. the making of submerged pipeline air guide sleeve according to claim 4 and fixation method, it is characterized in that, be provided with at least one waling at the inwall of every guide plate, from the end face direction of guide plate, every stiffening rib is thicker near head portion, and is thinner near the base part.
6. according to the making and the fixation method of claim 4 or 5 described submerged pipeline air guide sleeves, it is characterized in that, the width that the middle every guide plate of making of step (1) has the base of otch is got the external diameter of 0.5-1 times of pipeline, the external diameter of crow flight distance desirable 0.6-1.5 times pipelines of every guide plate from the top to the base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100520829A CN100532901C (en) | 2008-01-16 | 2008-01-16 | Submerged pipeline air guide sleeve and its production and fixing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100520829A CN100532901C (en) | 2008-01-16 | 2008-01-16 | Submerged pipeline air guide sleeve and its production and fixing method |
Publications (2)
| Publication Number | Publication Date |
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| CN101220887A CN101220887A (en) | 2008-07-16 |
| CN100532901C true CN100532901C (en) | 2009-08-26 |
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| CNB2008100520829A Expired - Fee Related CN100532901C (en) | 2008-01-16 | 2008-01-16 | Submerged pipeline air guide sleeve and its production and fixing method |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968139B (en) * | 2009-11-13 | 2012-02-29 | 天津大学 | Submarine pipeline buckle arrestor with spiral side plates and fixing method thereof |
| CN102175437B (en) * | 2011-01-14 | 2012-08-15 | 天津大学 | Buckling test device for deepwater submarine conduit |
| CN103115192B (en) * | 2013-02-04 | 2014-11-26 | 天津大学 | Method of strengthening deep water seafloor pipeline stability |
| US9033614B2 (en) * | 2013-05-29 | 2015-05-19 | Ge Oil & Gas Uk Limited | Pipe components and methods of manufacture |
| CN112113849A (en) * | 2020-09-08 | 2020-12-22 | 天津大学 | Method for applying initial defects of submarine pipeline |
| CN112648436B (en) * | 2020-12-29 | 2022-03-22 | 中国石油大学(北京) | Bundling submarine pipeline |
| CN113232260B (en) * | 2021-06-01 | 2022-06-17 | 邢台约翰威克士工业有限公司 | Pre-forming extrusion device for preparing rubber sealing element |
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2008
- 2008-01-16 CN CNB2008100520829A patent/CN100532901C/en not_active Expired - Fee Related
Non-Patent Citations (4)
| Title |
|---|
| 海底管跨涡激振动疲劳可靠性研究. 余建星，俞永清，李红涛，吴海欣.船舶力学，第9卷第2期. 2005 |
| 海底管跨涡激振动疲劳可靠性研究. 余建星，俞永清，李红涛，吴海欣.船舶力学，第9卷第2期. 2005 * |
| 深水管道涡激振动控制方法. 余建星，陈诚，赵冬岩，王猛.油气储运，第26卷第4期. 2007 |
| 深水管道涡激振动控制方法. 余建星，陈诚，赵冬岩，王猛.油气储运，第26卷第4期. 2007 * |
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| CN101220887A (en) | 2008-07-16 |
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