CN106049392A - Sleeve truss pile leg and pile shoe foundation - Google Patents
Sleeve truss pile leg and pile shoe foundation Download PDFInfo
- Publication number
- CN106049392A CN106049392A CN201610383952.5A CN201610383952A CN106049392A CN 106049392 A CN106049392 A CN 106049392A CN 201610383952 A CN201610383952 A CN 201610383952A CN 106049392 A CN106049392 A CN 106049392A
- Authority
- CN
- China
- Prior art keywords
- sleeve
- leg
- pile
- truss
- spud
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0056—Platforms with supporting legs
- E02B2017/006—Platforms with supporting legs with lattice style supporting legs
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B2017/0056—Platforms with supporting legs
- E02B2017/0073—Details of sea bottom engaging footing
Abstract
The invention discloses a sleeve truss pile leg and pile shoe foundation. 10-20 m high sleeves are embedded in an existing truss pile leg, the bottoms of the sleeves are fixedly connected with a pile shoe, and a cover plate is installed at the tops of the sleeves in a sealing mode. The sleeve truss pile leg and pile shoe foundation plays a supporting role in plastic backflow of soil and collapse of seabed topsoil, the foundation bearing capacity of the foundation can be effectively improved, the pile insertion depth of the pile leg is decreased, and installation and long-term operation stability of a drilling platform are facilitated. In addition, the sleeves can ascend and descend freely along with the truss pile leg, in the towing process, the sleeve pile leg is retracted in a main ship body, and extra water flow resistance and wind resistance are not caused. The sleeve truss pile leg and pile shoe foundation can be widely applied to installation and operation of independent pile leg and pile show structures of sea self-elevating drilling platforms in complex soil layers and has great social significance and economic value in promoting safe development of offshore oil and gas in China.
Description
Technical field
The present invention relates to the individual support leg of a kind of self-elevating drilling platform, be specifically related to a kind of sleeve truss leg shoe base
Plinth.
Background technology
In ocean self-elevating drilling platform installation process at the scene, independent truss leg spud-can is deadweight and precompressed lotus
Carry effect next insert in the bedding of seabed step by step, the most substantial amounts of earth is extruded by shoe and flows back into shoe top truss
Inside grid spud leg, meanwhile, a part of earth is kept off outside by truss structure, under long-term stormy waves load action, is blocked in
The earth of outside can collapse into suddenly inside truss leg, adds extra load to spud-can, reduces ground
Bearing capacity, causes the unexpected sedimentation outside whole spud leg shoe amount, it will usually cause the damage of single or multiple truss leg,
Serious meeting causes the inclination of whole drilling platforms even to turn over and sink, and causes great life and property loss.
The pull-down skirt bucket spud-can that Application comparison is many at present, is down to extend one along shoe maximum gauge periphery
Skirt barrel structure, this up prolongs raw sleeve spud-can, and its long skirt bucket can be greatly increased spud leg during platform is hauled
Resistance to water-flow, cause platform unstability to be toppled, be unfavorable for the towage stability of self-elevating drilling platform.During pitching pile, skirt
Barrel base can be too early disturbance shoe bottom solum, when run into upper overburden layer more than lower overburden layer intensity easily occur puncture destroy
During double-deck soil layer, the bearing capacity of ground will not increase and decreases on the contrary.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of sleeve truss leg shoe
Basis.
Technical scheme: for solving above-mentioned technical problem, the sleeve truss leg spud-can that the present invention provides, including truss
Spud leg and shoe, the embedded sleeve that is cased with of described truss leg, the bottom of described sleeve is fixing with shoe to be connected, the top of described sleeve
Portion has cover plate, and the height of described sleeve is 10-20m.
As preferably, described truss leg has vertical main chord tube, and adjacent main chord tube connects on facade oblique pull
Muscle.
When truss leg is triangular truss spud leg, described sleeve includes that be welded between adjacent main chord tube first is flat
Face, the second plane and the 3rd plane, connect between adjacent plane and have inner horizontal stay tube.
When truss leg is square truss leg, described sleeve includes that be welded between adjacent main chord tube first is flat
Face, the second plane, the 3rd plane and fourth plane.
The present invention proposes the manufacture method of above-mentioned sleeve truss leg spud-can simultaneously, comprises the following steps:
Step 1, is welded on sleeve plate between adjacent main chord tube；
Step 2, welds brace between adjacent main chord tube, welds inner horizontal stay tube between adjacent sleeve plate；
Step 3, seals sleeve at sleeve welded top steel plate；
Step 4, whole spud leg carries out welding with shoe and closes up with pitching pile.
The using method of the sleeve truss leg spud-can of the present invention, during towage, sleeve truss leg inside contracts at main hull
In, during installation, sleeve truss leg spud-can inserts in the bedding of seabed under the effect of deadweight and prefabricating load, sleeve stopper
During pitching pile and the plasticity backflow of seabed bedding earth when using.
Beneficial effect: the present invention, by sheathed sleeve in truss leg, forms sleeve truss leg spud-can, permissible
The plasticity backflow of the substantial amounts of soil caused during effective stop pitching pile, both can increase the foundation bearing capacity on basis, reduce
The plug-in depth of pile on basis, it is also possible to increase installation and the job stabilization of platform.
First, the increase of sleeve spud leg will not reduce the stability in the large on drilling platforms basis, therefore need not whole
The structure of platform carries out further conversion.Sleeve is directly welded on existing string pipe, and last and truss leg is as an entirety again
Carry out welding with shoe and close up with pitching pile, the truss leg being attached thereto and shoe are not had extra design requirement.
Secondly, with spud-can as basal plane, owing to the plasticity motion of soil is concentrated mainly on the ground of spud-can above section
Base soil, up prolongs raw sleeve spud-can and plays a supporting role plasticity backflow and the subsiding of sea bed topsoil of soil, can
With the effective foundation bearing capacity increasing basis, reduce the plug-in depth of pile of spud leg, beneficially drilling platforms and install and long-term operation
Stability.
And sleeve can be freely lifted along with truss leg, during towage, this sleeve spud leg inside contracts at main ship
Inside body, extra resistance to water-flow and wind resistance will not be caused.
The present invention can be widely applied to the ocean self-elevating drilling platform individual support leg pile shoe structure peace at complex random systems
In dress and operation, the security development promoting Chinese ocean petroleum and gas there are great social meaning and economic worth.
Except invention described above solves the technical problem that, constitutes the technical characteristic of technical scheme and by these skills
Outside the advantage that the technical characteristic of art scheme is brought, the other technologies that the sleeve truss leg spud-can of the present invention can solve
The advantage that the other technologies feature comprised in problem, technical scheme and these technical characteristics bring, will in conjunction with accompanying drawing make into
One step detailed description.
Accompanying drawing explanation
Fig. 1 is the structural representation of spud leg shoe in the embodiment of the present invention；
Fig. 2 is the top view of Fig. 1；
Fig. 3 is the schematic diagram of the Plastic flow of soil flowing that pitching pile causes；
In figure: triangular truss spud leg 1, triangular shaped sleeve 2, spud-can 3, main chord tube 4, brace 5, internal water supports
Pipe 6.
Detailed description of the invention
Embodiment:
The triangular shaped sleeve truss leg spud-can of the present embodiment as depicted in figs. 1 and 2, is made up of three parts, first
Part is existing independent triangular truss spud leg 1, can be freely lifted, and is mainly used to spud-can and jack up bottom connection
The top hull of drilling platforms, its cross section is an equilateral triangle, and facade is X-type truss form, and elevation can reach
The operating water depth of 150m；Part II is the triangular shaped sleeve 2 that the present invention increases, and the thickness of this triangular shaped sleeve 2 is generally
0.1m-0.2m, tightly in be welded in inside triangular truss spud leg 1, triangular shaped sleeve 2 is welded together with triangular truss spud leg 1
At the end face of spud-can 3, towage for convenience, triangular shaped sleeve 2 up prolongs the height and self-elevating drilling platform hull risen
The height of itself is close, and about 10-15m is the highest less than 20m, much smaller than the height of triangular truss spud leg 1.Its top
Encapsulation cover plate, it is to avoid earth collapses into wherein.Part III is the spud-can 3 that diameter is about 10-20m, has circle, side
The flat shape such as shape and polygon, shoe is connected with sleeve truss leg, can be freely lifted, and is used for supporting main hull.All
Relevant structural material and welding should meet the requirement of CCS (CCS) " material and welding conditions-2016 " with inspection.
Triangular truss spud leg 1 is mainly made up of main chord tube 4, brace 5 and horizontal stay tube 6.The material of main chord tube 4 is
ASTM A514 GR.Q, yield limit is 690MPa, and tensile strength is 770MPa/930MPa, the thickness 0.15m of main chord tube 4, outward
Diameter 0.65m.The seamless steel pipe that brace 5 uses material to be API 5L × 52, SMYS is 360MPa, brace 5
Thickness 0.022m, overall diameter 0.25m.Horizontal stay tube 6 material is ASTM A106 GR.B, and SMYS is 240MPa,
The thickness 0.01m of horizontal stay tube 6, overall diameter 0.15m.
Triangle set bucket spud leg 2 uses the steel plate of ASTM A514 GR.Q, and yield limit is 690MPa, and tensile strength is
770MPa/930MPa.Sleeve plate thickness 0.15m, surrounds an equilateral triangle structure, length sleeve 15m, divides two sections and be welded on
On main chord tube, every segment length 7.5m.After every section of sleeve has welded with main chord tube 4, then weld existing brace 5 and inside
Horizontal stay tube 6, finally seals sleeve at sleeve welded top steel plate.When whole spud leg has welded and reaches inspection mark
After standard, carry out welding with spud-can 3 by whole spud leg and close up with pitching pile.Welding requirements should meet CCS " material with weld rule
Model-2016 " regulation.
Including shoe, design total length 130m of spud leg, wherein shoe is highly 4.3m, and truss leg is a length of
126.8m.With the solder side of shoe and spud leg as basal plane, the main chord tube below basal plane vertical height 15m divides two sections of spreadings, every section
Length 7.5m is consistent with the length of sleeve.
In ocean self-elevating drilling platform installation process at the scene, the triangular shaped sleeve truss leg spud-can improved
Deadweight and prefabricating load effect under slowly be inserted into depths, seabed, especially in bury, in order to reach design
Bearing capacity of single pile, plug-in depth of pile often reaches the shoe diameter of 2-3 times, as deep as 30m-40m, during pitching pile, at the bottom of shoe
The substantial amounts of mud in portion is squeezed presses to shoe overhead reflux, and under the barrier effect of triangular shaped sleeve, the mud of backflow is blocked in
Outside sleeve, when plug-in depth of pile exceedes sleeve height, as it is shown on figure 3, the most basicly stable limitation of backflow of soil around shoe
Around shoe, do not interfere with the motion of overlying sea bed surface soil, under the barrier effect of triangular truss spud leg, seabed table
The soil part in face is blocked in outside truss leg, and partial collapse enters truss inner sleeve top, finally in sleeve top shape
Become a stable pit-hole depth H.
In soft soil foundation, 30m to be reached is the most deeper for plug-in depth of pile, propping up without triangular shaped sleeve spud leg
Support, substantial amounts of soil is back to spud-can top, brings extra overlying burden to basis, greatly reduces the ground on basis
Bearing capacity, needs deeper plug-in depth of pile to meet the demand of platform bearer power；In hard soil foundation, plug-in depth of pile requires to compare
Low, the backflow of foundation soil plasticity and subsiding of sea bed surface soil layer that pitching pile causes all are stopped by sleeve spud leg, effectively
Improve the foundation bearing capacity of spud-can.Without the effect of sleeve spud leg, pan soil strength ratio is relatively big, and pitching pile is big after completing
Part soil will be blocked in outside truss leg, form a deep interim stable pit-hole degree of depth.But, at long-term wind
Under wave load action, drilling platforms is during operation, and this pit-hole has the danger subsided, a large amount of earth to collapse at any time
In pit-hole, cause spud leg and platform that sedimentation suddenly occurs, be unfavorable for the long-term operation stability of spud leg and platform.
Certain ocean self-elevating drilling platform, design total length 130m of spud leg, wherein shoe is highly 4.3m, area 150m2,
Shoe volume is 360m3, a length of 126.8m of truss leg.The a length of 15m of triangular shaped sleeve, sleeve cross-sectional area is 60m2.Make
Sea of retribution substratum is over-consolidated clays, and soil body effective unit weight is 6kN/m3, soil layer surface strength is 5kPa, and soil strength is along with deeply
The increase of degree is linearly increasing, and increment rate is 2kPa/m,.In order to reach the load requirement of drilling platforms, bearing capacity of single pile requires not
Less than 32MN.
When plug-in depth of pile reaches 15m, in the case of having triangular shaped sleeve spud leg:
Bearing capacity of single pile=9 × 20 × 150+6 × 15 × 60+6 × 360=27000+5400+2160=34560kN=
34.56MN
When plug-in depth of pile reaches 15m, in the case of there is no triangular shaped sleeve spud leg:
Bearing capacity of single pile=9 × 20 × 150+6 × 360=27000+2160=29160kN=29.16MN
Bearing capacity of single pile improves (34.56-29.16)/29.16=18.5%
As above calculating understands, under the effect of triangular shaped sleeve spud leg, the Plastic Flow of soil is all blocked in beyond sleeve,
Cannot be back to shoe top, when plug-in depth of pile reaches sleeve top when, foundation bearing capacity improves 18.5%.
Above in association with accompanying drawing, embodiments of the present invention are described in detail, but the present invention is not limited to described reality
Execute mode.For those of ordinary skill in the art, in the range of the principle and technological thought of the present invention, these are implemented
Mode carries out multiple change, revises, replaces and deformation still falls within protection scope of the present invention.
Claims (6)
1. a sleeve truss leg spud-can, including truss leg and shoe, it is characterised in that: described truss leg is embedded
Being cased with sleeve, the bottom of described sleeve is fixing with shoe to be connected, and the top of described sleeve has cover plate, and the height of described sleeve is
10-20m。
Sleeve truss leg spud-can the most according to claim 1, it is characterised in that: described truss leg has vertically
Main chord tube, adjacent main chord tube connects on facade brace.
Sleeve truss leg spud-can the most according to claim 1, it is characterised in that: described truss leg is triangle
Truss leg, described sleeve includes the first plane, the second plane and the 3rd plane being welded between adjacent main chord tube, and adjacent is flat
Connect between face and have inner horizontal stay tube.
Sleeve truss leg spud-can the most according to claim 1, it is characterised in that: described truss leg is square
Truss leg, the first plane that described sleeve includes being welded between adjacent main chord tube, the second plane, the 3rd plane and Siping City
Face.
The manufacture method of sleeve truss leg spud-can the most according to claim 1, it is characterised in that include following step
Rapid:
Step 1, is welded on sleeve plate between adjacent main chord tube；
Step 2, welds brace between adjacent main chord tube, welds inner horizontal stay tube between adjacent sleeve plate；
Step 3, seals sleeve at sleeve welded top steel plate；
Step 4, whole spud leg carries out welding with shoe and closes up with pitching pile.
The using method of sleeve truss leg spud-can the most according to claim 1, it is characterised in that include following step
Rapid: during towage, sleeve truss leg inside contracts in main hull, during installation, sleeve truss leg spud-can is deadweight and precompressed lotus
Insert under the effect carried in the bedding of seabed, the plasticity backflow of seabed bedding earth when sleeve stopper pitching pile and use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610383952.5A CN106049392A (en) | 2016-06-01 | 2016-06-01 | Sleeve truss pile leg and pile shoe foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610383952.5A CN106049392A (en) | 2016-06-01 | 2016-06-01 | Sleeve truss pile leg and pile shoe foundation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106049392A true CN106049392A (en) | 2016-10-26 |
Family
ID=57171925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610383952.5A Pending CN106049392A (en) | 2016-06-01 | 2016-06-01 | Sleeve truss pile leg and pile shoe foundation |
Country Status (1)
| Country | Link |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106836167A (en) * | 2017-01-23 | 2017-06-13 | 武汉船用机械有限责任公司 | A kind of shoe for truss framed leg |
| CN108755645A (en) * | 2018-07-09 | 2018-11-06 | 中国石油大学(北京) | A kind of device and drilling platforms for reducing self-elevating drilling platform pile extraction resistance |
| CN114313126A (en) * | 2022-01-13 | 2022-04-12 | 东北石油大学 | Fabricated FRP concrete combined guyed tower type platform system and construction method thereof |
| CN115478843A (en) * | 2022-09-28 | 2022-12-16 | 中国石油大学(北京) | Egg shell stratum recognition device based on sound wave detection |
| CN114313126B (en) * | 2022-01-13 | 2024-04-19 | 东北石油大学 | Assembled FRP concrete combined guy cable tower platform system and construction method thereof |
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| US4632600A (en) * | 1985-09-25 | 1986-12-30 | Nippon Kokan Kabushiki Kaisha | Movable fixed-type semi-submerged construction |
| GB9717719D0 (en) * | 1997-08-22 | 1997-10-29 | Kazim Jenan | Improved self installing reusable fixed platforms |
| CN202124847U (en) * | 2011-06-13 | 2012-01-25 | 大连船舶重工集团有限公司 | Shape retaining workpiece for assembling of main chord pipes of truss type triangular spug legs of self-elevating drilling platform |
| CN103422482A (en) * | 2013-07-26 | 2013-12-04 | 江苏科技大学 | Splicing trussed type pile leg device |
| CN203654307U (en) * | 2014-01-02 | 2014-06-18 | 中船重工船舶设计研究中心有限公司 | Truss type pile leg |
-
2016
- 2016-06-01 CN CN201610383952.5A patent/CN106049392A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4632600A (en) * | 1985-09-25 | 1986-12-30 | Nippon Kokan Kabushiki Kaisha | Movable fixed-type semi-submerged construction |
| GB9717719D0 (en) * | 1997-08-22 | 1997-10-29 | Kazim Jenan | Improved self installing reusable fixed platforms |
| CN202124847U (en) * | 2011-06-13 | 2012-01-25 | 大连船舶重工集团有限公司 | Shape retaining workpiece for assembling of main chord pipes of truss type triangular spug legs of self-elevating drilling platform |
| CN103422482A (en) * | 2013-07-26 | 2013-12-04 | 江苏科技大学 | Splicing trussed type pile leg device |
| CN203654307U (en) * | 2014-01-02 | 2014-06-18 | 中船重工船舶设计研究中心有限公司 | Truss type pile leg |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106836167A (en) * | 2017-01-23 | 2017-06-13 | 武汉船用机械有限责任公司 | A kind of shoe for truss framed leg |
| CN108755645A (en) * | 2018-07-09 | 2018-11-06 | 中国石油大学(北京) | A kind of device and drilling platforms for reducing self-elevating drilling platform pile extraction resistance |
| CN108755645B (en) * | 2018-07-09 | 2024-02-02 | 中国石油大学(北京) | Device for reducing pile pulling resistance of jack-up drilling platform and drilling platform |
| CN114313126A (en) * | 2022-01-13 | 2022-04-12 | 东北石油大学 | Fabricated FRP concrete combined guyed tower type platform system and construction method thereof |
| CN114313126B (en) * | 2022-01-13 | 2024-04-19 | 东北石油大学 | Assembled FRP concrete combined guy cable tower platform system and construction method thereof |
| CN115478843A (en) * | 2022-09-28 | 2022-12-16 | 中国石油大学(北京) | Egg shell stratum recognition device based on sound wave detection |
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| C06 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20161026 |