CN105436659A - Process for replacing pile leg rack of self-elevating drilling platform - Google Patents
Process for replacing pile leg rack of self-elevating drilling platform Download PDFInfo
- Publication number
- CN105436659A CN105436659A CN201610008763.XA CN201610008763A CN105436659A CN 105436659 A CN105436659 A CN 105436659A CN 201610008763 A CN201610008763 A CN 201610008763A CN 105436659 A CN105436659 A CN 105436659A
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- Prior art keywords
- tooth bar
- rack
- welding
- drilling platform
- self
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/013—Arc cutting, gouging, scarfing or desurfacing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
Abstract
The invention discloses a process for replacing a pile leg rack of a self-elevating drilling platform. The process comprises the following steps: firstly arranging a limiting plate before removing the rack; respectively welding temporary supporting toggle plates on upper and lower main chord pipes of a replaceable rack so as to support temporary supporting pipes, and jacking by using a hydraulic jack; opening an original welding line by gouging, and jacking by the hydraulic jack to obtain amount of contraction of the welding line; arranging supporting pipes among the temporary supporting toggle plates; removing the replaced rack by gouging; firstly assembling and welding an upper joint seam and then assembling and welding a lower joint seam of the newly-mounted rack; finally performing inspection. Before the replaceable rack is removed from a pile leg, the limiting plate is firstly arranged for limiting free movement of the rack in front, rear, left and right directions; the temporary supporting toggle plates are respectively welded on the upper and lower main chord pipes; thus the weight of the pile leg on an interface, and the welding inner stress of another two welded racks of the same pile leg cannot cause large direction-undetermined displacement to an opened joint; the upper joint seam of the newly-mounted rack is firstly assembled and welded, and then the lower joint seam of the newly-mounted rack is assembled and welded, so that replacement of the pile leg rack of the self-elevating drilling platform is ensured to be performed smoothly.
Description
Technical field
The present invention relates to the technique that a kind of pile legs of self-elevating drilling platform tooth bar renews.
Background technology
In recent years, in ocean engineering self-elevating drilling platform be manufactured on domestic flourish.Spud leg is the most important parts of drilling platforms, and its dimensional accuracy and welding quality are all extremely important.When drilling platforms work, spud leg will bear the total weight of huge main hull, so in general, the Material Strength of spud leg itself is high, thickness is large.For the CJ50 series platform of Dutch MSC company designs, the tensile strength of its spud leg rack-plate and main chord tube reaches 830Mpa, and thickness also has 180mm.The alloying element of this steel is many, carbon equivalent ce and crack-sensitivity FACTOR P CM value high, add the thickness of its 180mm, cause the welding in its manufacture process and precision controlling to have certain difficulty.Welding quality and precision, as long as both have one to go wrong, so this docking port will be opened, and ressemble, weld.
Due to the structural consequences of tooth bar at whole platform and the particularity of steel, same position only allows a repair process herein, if still defective after repairing, will change weldment, and reconstruct.The construction difficulty of the tooth bar again changed is again than larger when installing first, weld.Because, 1) joint quantity now adds one times, and assembling, welding and precision controlling aspect also at least add one times of work; 2) former interface is once be opened, the welding interior stress of the weight of the spud leg so above interface and other two tooth bars welded of same spud leg all may cause large, the uncertain displacement in direction to the joint opened, this displacement if there is, that is exactly irreversible, this interface spud leg is up whole possibly to be taken off, and again fills, welds; 3) the new tooth bar again installed has very high binding force, the bad control of welding quality when welding; 4) pressure influence of project construction period that causes of the appearance of " accident " is to assembling, welder and all levels of management personnel.So, before tooth bar renews work, will formulate processing step that is careful in detail, that consider the various emergency case that may occur, the risk whole tooth bar being renewed work drops to minimum.
Therefore, need to provide a kind of new technical scheme to solve the problems referred to above.
Summary of the invention
The technical problem to be solved in the present invention is to provide the technique that a kind of pile legs of self-elevating drilling platform tooth bar renews.Guarantee that the spud leg tooth bar of self-elevating drilling platform renews carrying out smoothly of work.
For solving the problems of the technologies described above, the technique that a kind of pile legs of self-elevating drilling platform tooth bar of the present invention renews, comprises the following steps:
1), before drilling platform leg being taken off and renewed tooth bar, first add limiting plate and limit moving freely on its direction, front, rear, left and right, make total can only upper and lower to movement;
2) on the upper and lower main chord tube renewing tooth bar, temporary support bracket is welded respectively;
3) the square work of former problem weld seam gouge is opened;
4) hydraulic top jacking is to being changed the upper and lower crown of tooth bar apart from the weld shrinkage reserving certain distance;
5) temporary support pipe is set between the temporary support bracket of step 2;
6) gouge is removed and is changed tooth bar;
7) to the upper and lower twice seam of the tooth bar newly installed, the order of assembling successively, welding of first suitable for reading, rear end opening is adopted, i.e. seam in first welding equipment, then seam under welding equipment;
8) finally check.
In technique scheme, gouge being changed limiting plate tooth bar having welded front, rear, left and right relative movement occurs between the upper and lower spud leg of restriction, makes upper and lower spud leg that the relative displacement of upper and lower both direction can only occur before removing and being changed tooth bar.
Further, in step 4, during hydraulic top jacking, changed the upper and lower crown of tooth bar apart from the weld shrinkage leaving 6mm.
Beneficial effect of the present invention: drilling platform leg tooth bar renewed workmanship of the present invention, before spud leg is taken off and is renewed tooth bar, first add before limiting plate limits it, after, left, moving freely in right direction, on, lower main chord tube welds temporary support bracket respectively, put forth effort for temporary support pipe, and hydraulic top jacking, the weight of the spud leg above such interface, and the welding interior stress of other two tooth bars welded of same spud leg can not cause large to the joint opened, the uncertain displacement in direction, to the tooth bar newly installed, seam in first welding equipment, seam under welding equipment again, guarantee that the spud leg tooth bar of self-elevating drilling platform renews carrying out smoothly of work.
Accompanying drawing explanation
To be drilling platform leg renew area schematic with what change the long tooth bar of three teeth to Fig. 1.
Fig. 2 a is added spacing horse plate schematic diagram before the present invention cuts.
Fig. 2 b is the side view of Fig. 2 a.
Fig. 3 is the schematic diagram of temporary support pipe of the present invention.
Wherein: 1, the landing stage of scaffold, 2, front and back limiting plate, 3, left and right limiting plate, 4, upper main chord tube, 5, lower main chord tube, 6, temporary support bracket, 7, temporary support pipe, 8, former problem weld seam, 9, spud leg down tube.
Detailed description of the invention
In order to deepen the understanding of the present invention, below in conjunction with embodiment and accompanying drawing, the invention will be further described, and this embodiment, only for explaining the present invention, does not form the restriction to protection scope of the present invention.
The technique that a kind of pile legs of self-elevating drilling platform tooth bar of the present invention renews, comprises the following steps:
1) number of teeth needing to renew is determined.General Requirements avoids heat-affected zone, 3 ~ 4 teeth are advisable, shown in Fig. 1, to renew 3 teeth, the upper main chord tube 4 of drilling platform leg has dash area and dash area semi-circular plate in spud leg down tube 9, figure all to need to change, dash area semi-circular plate flushes with the landing stage of scaffold 1, be difficult to construction, scaffold need be revised in scene.
Tooth bar renew after region decides, also to consider that main chord tube also will renew one section, leave construction space to the engineering that renews of new tooth bar, renew length and be advisable with both weld seams 300mm that staggers.Before drilling platform leg is taken off and renewed tooth bar, first add limiting plate and limit moving freely on its direction, front, rear, left and right, make total can only upper and lower to movement.Concrete: welded limiting plate near the former docking port of tooth bar, in order to limit the movement in direction, tooth bar front, rear, left and right.As shown in Fig. 2 a, 2b, positive and negative each two pieces of front and back limiting plate 2, two pieces of front are only welded former weld seam with upper part, and two pieces of reverse side are only welded former weld seam with lower part, and before and after 4 pieces, the effect of limiting plate is the movement of restriction diagram fore-and-aft direction; Left and right limiting plate 3 also has 4 pieces, is welded on and is changed the crown place of tooth bar, and effect is the movement of restriction diagram left and right directions;
2) on the upper and lower main chord tube 4,5 renewing tooth bar, weld temporary support bracket 6 respectively, put forth effort for temporary support pipe 7, and hydraulic top jacking;
3) the temporary support bracket 6 on upper main chord tube is used as hydraulic top support plate, former problem weld seam 8 mode of gouge is opened, utilizes hydraulic top to adjust up and down space width; The flexibility of gouge mode is very large, can carry out all positon operation.If adopt gas cutting mode, then can be blocked up because of rack-plate, and the problem such as the too high gas pressure caused in locus is little, form cutting sagging.
4) hydraulic top jacking is to being changed the upper and lower crown of tooth bar apart from the weld shrinkage reserving certain distance; The distance of jacking can offset the thermal shrinking quantity that upper and lower twice increase the follow-up welding generation of weld seam newly.One is to allow its free shrink, reduces internal stress; Two be ensure that welded after obtain the space width in tolerance permitted range, ensure rack and pinion can normally engage.
5), shown in Fig. 3, temporary support pipe 7 is set between the temporary support bracket 6 of step 2;
6) gouge is removed and is changed tooth bar, will measure, setting-out before gouge; Selecting to use gouge mode, is to obtain wanted bevel for welding form eaily.Groove face at least stays 3mm grinding process, and object to get rid of the carburized layer affecting welding sequence below, and groove face can certainly be made more smooth, fills the fusion of metal and mother metal, reduce the possibility of welding inclusion when being convenient to weld.
7) to the upper and lower twice seam of the tooth bar newly installed, the order of assembling successively, welding of first suitable for reading, rear end opening is adopted, i.e. seam in first welding equipment, then seam under welding equipment; Here the method for " twice seam assembles simultaneously, applies for checking and examination simultaneously " that the program of applying for checking and examination can be made more to simplify has been abandoned, be because: separately welding, can allow in welding process, the overall constraint (restraint) degree of structure is less, can not form tension between twice weld seam, such weld is accepted rate is more easily guaranteed.And separately dress, weldering, more flexibly by the welding sequence of each bar weld seam both sides of adjustment, linearity can also be ensured.
8) finally check.MT, UT of mainly comprising weld seam check, the linearity of 20 teeth, camber inspection.Can between 20 tine length the parallel mode of steel wire of drawing to check dimensional accuracy.
In step 4, during hydraulic top jacking, consider each seam 3mm of amount of contraction of weld seam, changed the upper and lower crown of tooth bar apart from the weld shrinkage leaving 6mm.Because the distance of hydraulic top jacking can offset the thermal shrinking quantity that upper and lower twice increase the follow-up welding generation of weld seam newly.
Drilling platform leg tooth bar renewed workmanship of the present invention, before first adding limiting plate restriction spud leg, after, left, moving freely in right direction, on, lower main chord tube welds temporary support bracket respectively, put forth effort for temporary support pipe, and hydraulic top jacking, the weight of the spud leg above such interface, and the welding interior stress of other two tooth bars welded of same spud leg can not cause large to the joint opened, the uncertain displacement in direction, the square work of former problem weld seam gouge is opened, hydraulic top is utilized to adjust up and down space width, hydraulic top jacking is to being changed the upper of tooth bar, lower crown is apart from the weld shrinkage reserving certain distance, the distance of jacking can be offset, lower twice increase the thermal shrinking quantity that the follow-up welding of weld seam produces newly, gouge is removed and is changed tooth bar again, to the tooth bar newly installed, upper to the tooth bar newly installed, lower twice seam, seam in first welding equipment, seam under welding equipment again.
Whole spud leg tooth bar renewed workmanship, welding quality is easy to control, overcomes the construction difficulty of the tooth bar again changed.Guarantee that the spud leg tooth bar of self-elevating drilling platform renews carrying out smoothly of work.
Claims (3)
1. the technique that renews of pile legs of self-elevating drilling platform tooth bar, is characterized in that, comprise the following steps:
1), before drilling platform leg being taken off and renewed tooth bar, first add limiting plate and limit moving freely on its direction, front, rear, left and right, make total can only upper and lower to movement;
2) on the upper and lower main chord tube renewing tooth bar, temporary support bracket is welded respectively;
3) the square work of former problem weld seam gouge is opened;
4) hydraulic top jacking is to being changed the upper and lower crown of tooth bar apart from the weld shrinkage reserving certain distance;
5) temporary support pipe is set between the temporary support bracket of step 2;
6) gouge is removed and is changed tooth bar;
7) to the upper and lower twice seam of the tooth bar newly installed, the order of assembling successively, welding of first suitable for reading, rear end opening is adopted, i.e. seam in first welding equipment, then seam under welding equipment;
8) finally check.
2. the technique that renews of a kind of pile legs of self-elevating drilling platform tooth bar according to claim 1, it is characterized in that: before gouge is removed and changed tooth bar, being changed limiting plate tooth bar having welded front, rear, left and right relative movement occurs between the upper and lower spud leg of restriction, make upper and lower spud leg that the relative displacement of upper and lower both direction can only occur.
3. the technique that renews of a kind of pile legs of self-elevating drilling platform tooth bar according to claim 1, is characterized in that: in step 4, during hydraulic top jacking, is changed the upper and lower crown of tooth bar apart from the weld shrinkage leaving 6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610008763.XA CN105436659B (en) | 2016-01-08 | 2016-01-08 | The technique that a kind of pile legs of self-elevating drilling platform rack renews |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610008763.XA CN105436659B (en) | 2016-01-08 | 2016-01-08 | The technique that a kind of pile legs of self-elevating drilling platform rack renews |
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| Publication Number | Publication Date |
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| CN105436659A true CN105436659A (en) | 2016-03-30 |
| CN105436659B CN105436659B (en) | 2017-11-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108723690A (en) * | 2017-04-19 | 2018-11-02 | 烟台铁中宝钢铁加工有限公司 | Spud leg main chord tube asymmetry replaces the process of semifocal chord pipe |
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| GB758244A (en) * | 1951-10-24 | 1956-10-03 | Graver Tank & Mfg Co Inc | Welding tool manipulating apparatus |
| US3479484A (en) * | 1966-04-06 | 1969-11-18 | Technigaz | Method and apparatus for guiding a torch in lap welding |
| CN1833076A (en) * | 2003-07-02 | 2006-09-13 | 工业钢铁法国公司 | Method for assembly of a section of rack on a self-raising oil platform |
| US20070107366A1 (en) * | 2005-10-14 | 2007-05-17 | Enrique Franco | Apparatus and method for manufacturing poles and columns |
| CN102029457A (en) * | 2010-12-01 | 2011-04-27 | 武昌船舶重工有限责任公司 | Vertical butt welding process of high-strength steel for ship structures |
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| CN103406639A (en) * | 2013-08-20 | 2013-11-27 | 南通中新钢构重工有限公司 | Welding process for pile leg stereo sectional erection |
| CN203498830U (en) * | 2013-08-15 | 2014-03-26 | 中集海洋工程研究院有限公司 | Folding, limiting and tightening device for ultra-large truss type pile leg subsections |
| CN204504600U (en) * | 2015-03-05 | 2015-07-29 | 烟台铁中宝钢铁加工有限公司 | For assistance platform and the bracing or strutting arrangement thereof of the welding of jack up drilling platform spud leg |
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2016
- 2016-01-08 CN CN201610008763.XA patent/CN105436659B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB758244A (en) * | 1951-10-24 | 1956-10-03 | Graver Tank & Mfg Co Inc | Welding tool manipulating apparatus |
| US3479484A (en) * | 1966-04-06 | 1969-11-18 | Technigaz | Method and apparatus for guiding a torch in lap welding |
| CN1833076A (en) * | 2003-07-02 | 2006-09-13 | 工业钢铁法国公司 | Method for assembly of a section of rack on a self-raising oil platform |
| US20070107366A1 (en) * | 2005-10-14 | 2007-05-17 | Enrique Franco | Apparatus and method for manufacturing poles and columns |
| CN102029457A (en) * | 2010-12-01 | 2011-04-27 | 武昌船舶重工有限责任公司 | Vertical butt welding process of high-strength steel for ship structures |
| CN102699494A (en) * | 2012-07-04 | 2012-10-03 | 上海振华重工集团(南通)传动机械有限公司 | Overall heating automatic welding process of spud leg main coil of offshore drilling platform and special tool of overall heating automatic welding process |
| CN203498830U (en) * | 2013-08-15 | 2014-03-26 | 中集海洋工程研究院有限公司 | Folding, limiting and tightening device for ultra-large truss type pile leg subsections |
| CN103406639A (en) * | 2013-08-20 | 2013-11-27 | 南通中新钢构重工有限公司 | Welding process for pile leg stereo sectional erection |
| CN204504600U (en) * | 2015-03-05 | 2015-07-29 | 烟台铁中宝钢铁加工有限公司 | For assistance platform and the bracing or strutting arrangement thereof of the welding of jack up drilling platform spud leg |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108723690A (en) * | 2017-04-19 | 2018-11-02 | 烟台铁中宝钢铁加工有限公司 | Spud leg main chord tube asymmetry replaces the process of semifocal chord pipe |
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| Publication number | Publication date |
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| CN105436659B (en) | 2017-11-17 |
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