CN204690716U - A kind of leg chord of pile legs of self-elevating drilling platform - Google Patents
A kind of leg chord of pile legs of self-elevating drilling platform Download PDFInfo
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- CN204690716U CN204690716U CN201520415022.4U CN201520415022U CN204690716U CN 204690716 U CN204690716 U CN 204690716U CN 201520415022 U CN201520415022 U CN 201520415022U CN 204690716 U CN204690716 U CN 204690716U
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Abstract
The utility model discloses a kind of leg chord of pile legs of self-elevating drilling platform, the cylindrical structure of this leg chord, and semi-circular plate and a later half plectane before comprising a rack-plate, front semi-circular plate and later half plectane are symmetrically welded the both sides, front and back in rack-plate, rack-plate comprises two row tooth bars of symmetrical distribution, front semi-circular plate comprises the lower front semi-circular plate that go forward semi-circular plate and thickness are greater than semi-circular plate of going forward, and later half plectane comprises the lower later half plectane that later half plectane and thickness are greater than later half plectane.Compared with prior art, leg chord of the present utility model is under the prerequisite meeting the technical indicators such as leg chord supporting capacity, through repeatedly optimal design, by FEM (finite element) calculation repeatedly, obtains the optimum-size of leg chord.The tip designs of leg chord of the present utility model bevel for welding, when self-elevating drilling platform enters comparatively territory, deep-sea operation, at any time to spud leg spreading, can facilitate the job requirements of different waters.
Description
Technical field
The utility model relates to offshore oil drilling field, particularly a kind of leg chord of pile legs of self-elevating drilling platform.
Background technology
The mankind, after entering 21 century, have not only welcome World Economics and the develop rapidly of science and technology, have also welcome the energy epoch rare gradually simultaneously.The exploitation of the energy and utilization, be every country must in the face of and the subject matter effectively solved.Past, owing to being subject to the restriction of science and technology, world energy sources mainly comes from mineral resources and the petroleum resources on land, but, according to the current own resource such as land mineral products, oil, natural gas through finding, its yield at most only can also maintain over one hundred year, and the time limit adopted of its Mineral Resource is confined to 30-80 especially.Under so severe environment, the sight of the mankind starts to invest ocean.
At present, along with continually developing of offshore oil and gas, the demand of the portable oil/gas drilling equipment in ocean is also constantly strengthened.Self-elevating drilling platform is a kind of as the portable oil/gas drilling equipment in ocean, is widely used in marine oil and gas drilling field.Along with the increasing of self-elevating drilling platform operating water depth, pile leg structure size and weight can significantly increase thereupon, and wind area promotes greatly, now the stability of platform when operation and towage can be poorer, in other words the design of pile leg structure is directly connected to the safety of whole platform, therefore the design of pile leg structure is important step very important in self-elevating drilling platform global design, and under the prerequisite ensureing pile leg structure safety, continue to optimize pile leg structure pattern and make it stressed more rationally and economy is better.
As main load-carrying member, leg chord is the integrally-built safety guarantee of spud leg.Pile leg structure is made up of the braced structures between chord member and chord member, and chord member is its main load parts.The method of tradition manufacture leg chord is that employing two pieces of semi-circular plates and rack-plate are welded in the world at present, but due to the reason in design, make the thickness equidimension of the semi-circular plate of leg chord and rack-plate all excessive, although can reach the supporting capacity needed for operation, the difficulty of its cost and welding improves all greatly.So, how while the technical indicators such as guarantee supporting capacity, control the cost of leg chord manufacture and to reduce welding difficulty be that we need research badly.
Summary of the invention
The purpose of this utility model, a kind of leg chord of pile legs of self-elevating drilling platform is provided exactly in order to solve the problem, this leg chord not only technical indicator such as supporting capacity is suitable with leg chord of the prior art, and its material manufactured more is saved, and cost is lower.
The purpose of this utility model is achieved in that
A kind of leg chord of pile legs of self-elevating drilling platform, the cylindrical structure of this leg chord, and semi-circular plate and a later half plectane before comprising a rack-plate, described front semi-circular plate and later half plectane are symmetrically welded the both sides, front and back in described rack-plate, and described rack-plate comprises two row tooth bars of symmetrical distribution, and the tooth root width of described rack-plate is 550mm, addendum width is 950mm, thickness is 165.1mm, and the modulus of described tooth bar is 100mm, and pressure angle is 28 °; The cross section of described front semi-circular plate and later half plectane is all in a sector structure, the cross section of rack-plate is a rectangular configuration, on the center line that the center of circle of described front semi-circular plate cross section is positioned at described rack-plate cross section and distance rack-plate leading flank 25mm, on the center line that the center of circle of described later half plectane cross section is positioned at described rack-plate cross section and distance rack-plate trailing flank 25mm; The top of described rack-plate and the two sides, front and back being positioned at described rack-plate are respectively arranged with bevel for welding, described rack-plate top is 150mm apart from the distance on described front semi-circular plate and later half plectane top, and described rack-plate bottom is 100mm apart from the distance of described front semi-circular plate and later half plectane bottom; Described front semi-circular plate comprise go forward semi-circular plate and thickness be greater than described in go forward the lower front semi-circular plate of semi-circular plate, described later half plectane comprises the lower later half plectane that later half plectane and thickness are greater than described later half plectane.
The leg chord of above-mentioned a kind of pile legs of self-elevating drilling platform, wherein, described length of going forward semi-circular plate and described lower front semi-circular plate is 197:10 than with the length ratio of described later half plectane and lower later half plectane, described outer curvature radius of going forward semi-circular plate and described later half plectane is 260mm, incurvature radius is 221.9mm, and the outer curvature radius of described lower front semi-circular plate and lower later half plectane is 260mm, incurvature radius is 210mm.
The leg chord of above-mentioned a kind of pile legs of self-elevating drilling platform, wherein, the angle of described bevel for welding is 5 °, and root face is long is 25mm.
The leg chord of above-mentioned a kind of pile legs of self-elevating drilling platform, wherein, described leg chord adopts modified alloy steel to make.
Compared with prior art, leg chord of the present utility model is under the prerequisite meeting the technical indicators such as leg chord supporting capacity, through repeatedly optimal design, by FEM (finite element) calculation repeatedly, obtains the optimum-size of leg chord.The tip designs of leg chord of the present utility model bevel for welding, when self-elevating drilling platform enters comparatively territory, deep-sea operation, at any time to spud leg spreading, can facilitate the job requirements of different waters.
Accompanying drawing explanation
Fig. 1 is the structural representation of leg chord cross section of the present utility model;
Fig. 2 is the structural representation on leg chord top of the present utility model;
Fig. 3 is the structural representation of leg chord bottom of the present utility model;
Fig. 4 is the structural representation of rack-plate of the present utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail.
A kind of leg chord of pile legs of self-elevating drilling platform, the cylindrical structure of this leg chord, and semi-circular plate 2 and a later half plectane 3 before comprising a rack-plate 1, front semi-circular plate 1 and later half plectane 3 are symmetrically welded the both sides, front and back in rack-plate 1, and rack-plate comprises two row tooth bars 11 of symmetrical distribution, and the tooth root width L1 of rack-plate 1 is 550mm, addendum width L2 is 950mm, thickness L3 is 165.1mm, and the modulus of tooth bar is 100mm, and pressure angle is 28 °.
Front semi-circular plate 2 comprises the lower front semi-circular plate that go forward semi-circular plate and thickness are greater than semi-circular plate of going forward, and later half plectane 3 comprises the lower later half plectane that later half plectane and thickness are greater than later half plectane.The length of semi-circular plate and lower front semi-circular plate of going forward is 197:10 than with the length ratio of upper later half plectane and lower later half plectane, going forward, the outer curvature radius of semi-circular plate and upper later half plectane is 260mm, incurvature radius is 221.9mm, and the outer curvature radius of lower front semi-circular plate and lower later half plectane is 260mm, incurvature radius is 210mm.
For choosing of above size, the leg chord of our the prior art spud leg that has been global alignment, and being drawn by FEM (finite element) calculation, existing makes brief description to choosing of above size.
| Spud leg part dimension | Prior art | The utility model |
| Rack-plate thickness (mm) | 177.8 | 165.1 |
| Addendum width (mm) | 838.2 | 950 |
| Tooth root width (mm) | 464.7 | 550 |
| Rack-plate modulus | 97 | 100 |
| Pressure angle | 30° | 28° |
| Semi-circular plate outer curvature radius (mm) | 222.25 | 260 |
| Semi-circular plate incurvature radius (mm) | 139.7 | 221.9(210) |
For the utility model, semi-circular plate in upper table refers to semi-circular plate of going forward, lower front semi-circular plate, upper later half plectane and lower later half plectane, wherein the go forward outer curvature radius of semi-circular plate, lower front semi-circular plate, upper later half plectane and lower later half plectane is 260mm, the go forward incurvature radius of semi-circular plate and upper later half plectane is 221.9mm, and the incurvature radius of lower front semi-circular plate and lower later half plectane is 210mm.
Upper table is that the leg chord of a certain model pile legs of self-elevating drilling platform among prior art and the size comparison of a leg chord of the present utility model parts show.For these three parameters of rack-plate thickness, addendum width and tooth root width, the rack-plate 1 Thickness Ratio prior art of the utility model leg chord want thin 7%, but tooth bar width will exceed 12%.Improve the design of rack-plate size, be find based in design, the flexural deformation of pile leg structure along rack-plate width is born in the effect of rack-plate, and the flexural deformation of through-thickness is mainly born by semi-circular plate.Therefore, rack-plate 1 size that the utility model proposes, has acted on the principle of this member stress exactly.The weight of the rack-plate 1 that the utility model proposes in unit length is substantially identical with rack-plate of the prior art, therefore only from rack-plate this, on the basis not increasing material weight and cost, according to the rack-plate size of the distribution situation reasonably optimizing of power, the selection of material is more reasonable.
For rack-plate modulus and these two parameters of pressure angle, tooth bar modulus of the present utility model and pressure angle are respectively 100 and 28 °, and this chooses after the shear strength of the stressing conditions and tooth root place that consider rack and pinion engagement.Because tooth bar modulus is larger, the ability that tooth bar bears external applied load is stronger; Pressure angle is larger, and the shear strength at tooth root place is better.The utility model design profile of tooth, have passed through carefully thorough Strength co-mputation, considered above-mentioned factor, within the specific limits relatively after, the tooth bar modulus finally chosen is modulus 100 and pressure angle is 28 °.
For these two parameters of inside and outside radius of curvature of semi-circular plate, the semi-circular plate outer curvature radius of the utility model design wants large compared with the semi-circular plate outer curvature radius of prior art, and this is mainly because rack-plate width broadens.In addition, the thickness of semi-circular plate reduces greatly, and the thickness of go forward semi-circular plate and upper later half plectane is only 46% of semi-circular plate thickness in prior art, and the thickness of lower front semi-circular plate and lower later half plectane is only 61% of semi-circular plate thickness in prior art.The reason of such design is that we find in the design process, and the bending load on rack-plate thickness direction is mainly born in the effect of semi-circular plate.Due to the shape of semi-circular plate, cause its energy born along the bending load on rack-plate thickness direction will be eager to excel many than general steel plate, and through careful accurate calculating, the semi-circular plate gauge of the utility model design enough can meet the requirement of strength of spud leg main chord, and the thickness reducing semicircle that therefore the utility model is larger is reliably rationally.Meanwhile, the minimizing of semi-circular plate thickness, greatly reduce the weight of material: consider that a chord member is made up of two parts semi-circular plate, one pile leg has 3 main chords, and a platform has three pile legs at least, and spud leg length is more than 100 meters, adopt the pile leg structure of semi-circular plate thickness of the present utility model compared with the weight of existing pile leg structure, the spud leg weight reduced has some idea of, and can save the purchase cost of material and reduction with regard to this, luxuriant is considerable.
It is also to be noted that, semi-circular plate in the utility model and prior art have a difference, the thickness being exactly its semi-circular plate can be thickening at place bottom spud leg, such design is comparatively large based on power suffered bottom spud leg, and the thickness strengthening semi-circular plate in bottom can make the stability of self-elevating drilling platform entirety better.
The cross section of front semi-circular plate 2 and later half plectane 3 is all in a sector structure, the cross section of rack-plate 1 is a rectangular configuration, on the center line that the center of circle A of front semi-circular plate 2 cross section is positioned at rack-plate 1 cross section and distance rack-plate 1 leading flank 25mm, on the center line that the center of circle B of later half plectane 3 cross section is positioned at rack-plate 1 cross section and distance rack-plate 1 trailing flank 25mm.Semi-circular plate so designs, there is following several advantage: when identical curvature, the closer to tooth bar center, semi-circular plate materials'use reduces, wind area significantly reduces, and corresponding wind load also reduces, and pile leg structure weight reduces greatly, when ensureing the ability of chord member carrying external load, choose semi-circular plate distance of center circle from rack-plate face 25mm.
The top of the rack-plate 1 and two sides, front and back being positioned at rack-plate 1 are respectively arranged with bevel for welding 12, the angle of bevel for welding 12 is 5 °, and the long L6 of root face is 25mm.Rack-plate 1 top is 150mm apart from the distance L4 on front semi-circular plate 2 and later half plectane 3 top, and rack-plate 1 bottom is 100mm apart from the distance L5 of front semi-circular plate 2 and later half plectane 3 bottom.Being designed with like this is beneficial to the operation of self-elevating drilling platform in different waters, under normal circumstances, leg chord of the present utility model is used to carry out operation, if but after finding that the marine site of operation deepens, one section can be connect again at any time on the top of spud leg, make the length of spud leg, thus increase the depth of implements of self-elevating drilling platform, meet the handling situations in different waters.
Rack-plate 1, front semi-circular plate 2 and rear semicircle 3 plate all adopt the modified alloy steel of ASTM A517GR Q high strength to make.
Compared with prior art, leg chord of the present utility model is under the prerequisite meeting the technical indicators such as leg chord supporting capacity, through repeatedly optimal design, by FEM (finite element) calculation repeatedly, obtains the optimum-size of leg chord.The tip designs of leg chord of the present utility model bevel for welding, when self-elevating drilling platform enters comparatively territory, deep-sea operation, at any time to spud leg spreading, can facilitate the job requirements of different waters.
Above embodiment is only for illustration of the utility model, but not to restriction of the present utility model, person skilled in the relevant technique, when not departing from spirit and scope of the present utility model, various conversion or modification can also be made, therefore all equivalent technical schemes also should belong to category of the present utility model, should be limited by each claim.
Claims (4)
1. the leg chord of a pile legs of self-elevating drilling platform, the cylindrical structure of this leg chord, and semi-circular plate and a later half plectane before comprising a rack-plate, described front semi-circular plate and later half plectane are symmetrically welded the both sides, front and back in described rack-plate, and described rack-plate comprises two row tooth bars of symmetrical distribution, it is characterized in that, the tooth root width of described rack-plate is 550mm, and addendum width is 950mm, and thickness is 165.1mm, the modulus of described tooth bar is 100mm, and pressure angle is 28 °;
The top of described rack-plate and the two sides, front and back being positioned at described rack-plate are respectively arranged with bevel for welding, described rack-plate top is 150mm apart from the distance on described front semi-circular plate and later half plectane top, and described rack-plate bottom is 100mm apart from the distance of described front semi-circular plate and later half plectane bottom;
The cross section of described front semi-circular plate and later half plectane is all in a sector structure, the cross section of rack-plate is a rectangular configuration, on the center line that the center of circle of described front semi-circular plate cross section is positioned at described rack-plate cross section and distance rack-plate leading flank 25mm, on the center line that the center of circle of described later half plectane cross section is positioned at described rack-plate cross section and distance rack-plate trailing flank 25mm;
Described front semi-circular plate comprise go forward semi-circular plate and thickness be greater than described in go forward the lower front semi-circular plate of semi-circular plate, described later half plectane comprises the lower later half plectane that later half plectane and thickness are greater than described later half plectane.
2. the leg chord of a kind of pile legs of self-elevating drilling platform as claimed in claim 1, it is characterized in that, described length of going forward semi-circular plate and described lower front semi-circular plate is 187:10 than with the length ratio of described later half plectane and lower later half plectane, described outer curvature radius of going forward semi-circular plate and described later half plectane is 260mm, incurvature radius is 221.9mm, and the outer curvature radius of described lower front semi-circular plate and lower later half plectane is 260mm, incurvature radius is 210mm.
3. the leg chord of a kind of pile legs of self-elevating drilling platform as claimed in claim 1, is characterized in that, the angle of described bevel for welding is 5 °, and root face is long is 25mm.
4. the leg chord of a kind of pile legs of self-elevating drilling platform as claimed in claim 1, is characterized in that, described leg chord adopts modified alloy steel to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520415022.4U CN204690716U (en) | 2015-06-15 | 2015-06-15 | A kind of leg chord of pile legs of self-elevating drilling platform |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520415022.4U CN204690716U (en) | 2015-06-15 | 2015-06-15 | A kind of leg chord of pile legs of self-elevating drilling platform |
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| CN204690716U true CN204690716U (en) | 2015-10-07 |
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| CN201520415022.4U Expired - Fee Related CN204690716U (en) | 2015-06-15 | 2015-06-15 | A kind of leg chord of pile legs of self-elevating drilling platform |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106568368A (en) * | 2016-10-08 | 2017-04-19 | 武汉船用机械有限责任公司 | Tool and method for measuring height of semicircular plate of leg chord |
| CN110306513A (en) * | 2019-05-13 | 2019-10-08 | 烟台中集来福士海洋工程有限公司 | Main chord tube and its design method, spud leg |
| CN115826606A (en) * | 2023-02-14 | 2023-03-21 | 中国船舶集团有限公司第七〇七研究所 | Dynamic positioning control method of self-elevating ship platform |
-
2015
- 2015-06-15 CN CN201520415022.4U patent/CN204690716U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106568368A (en) * | 2016-10-08 | 2017-04-19 | 武汉船用机械有限责任公司 | Tool and method for measuring height of semicircular plate of leg chord |
| CN106568368B (en) * | 2016-10-08 | 2019-06-21 | 武汉船用机械有限责任公司 | A kind of spud leg rack gear string pipe semi-circular plate elevation carrection tooling and measurement method |
| CN110306513A (en) * | 2019-05-13 | 2019-10-08 | 烟台中集来福士海洋工程有限公司 | Main chord tube and its design method, spud leg |
| CN110306513B (en) * | 2019-05-13 | 2021-05-18 | 烟台中集来福士海洋工程有限公司 | Main chord pipe, design method thereof and pile leg |
| CN115826606A (en) * | 2023-02-14 | 2023-03-21 | 中国船舶集团有限公司第七〇七研究所 | Dynamic positioning control method of self-elevating ship platform |
| CN115826606B (en) * | 2023-02-14 | 2023-04-21 | 中国船舶集团有限公司第七〇七研究所 | Dynamic positioning control method for self-elevating ship platform |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151007 Termination date: 20190615 |
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| CF01 | Termination of patent right due to non-payment of annual fee |