CN105234575B - Manufacturing method for self-elevating type offshore platform cylindrical pile leg - Google Patents
Manufacturing method for self-elevating type offshore platform cylindrical pile leg Download PDFInfo
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- CN105234575B CN105234575B CN201510796018.1A CN201510796018A CN105234575B CN 105234575 B CN105234575 B CN 105234575B CN 201510796018 A CN201510796018 A CN 201510796018A CN 105234575 B CN105234575 B CN 105234575B
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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Abstract
The invention discloses a manufacturing method for a self-elevating type offshore platform cylindrical pile leg. The manufacturing method for the self-elevating type offshore platform cylindrical pile leg comprises the following steps of manufacturing and spreading of a cylinder in sections, manufacturing and spreading of a rack in sections, assembling and welding of the spread rack section and the sectional cylinder and folding of the pile leg. Manufacturing of the pile leg can be completed within the limited period through the method, and the welding quality and welding precision both meet the requirements of working conditions.
Description
Technical Field
The invention belongs to the technical field of manufacturing of marine platforms, and particularly relates to a manufacturing method of a cylindrical pile leg of a self-elevating marine platform.
Background
The self-elevating marine platform is mainly used for matching drilling platforms to drill, oil field production service, offshore oil field construction, oil field production increase, well repair operation, life support, wind power installation and the like. Taking a self-elevating drilling platform as an example, a plurality of lifting pile legs of a drilling machine, power, equipment and living equipment are loaded on the self-elevating drilling platform, when drilling, pile shoes at the bottoms of the pile legs are grounded, and the platform rises to a certain height from the sea surface along the pile legs; when the platform is shifted, the platform is lowered to the water surface, the pile legs are lifted, and the platform is like a barge and can be towed to a new well position by a towing wheel. Therefore, the pile legs are the key parts of the self-elevating offshore platform, when the self-elevating offshore platform performs operation, the platform needs to be lifted to a safe height above the sea surface through the lifting mechanism, then pile insertion of the pile legs is performed, and the whole platform is supported by the pile shoe.
At present, the main structural form of the self-elevating marine platform cylindrical pile leg is that a cylindrical barrel is additionally provided with racks on two sides, a lifting system is the key that the whole self-elevating platform can be lifted smoothly, and the pile leg is taken as the main structure of the lifting system, so that the welding quality of the pile leg and the precision control of the pile leg are all very important.
In the process of manufacturing the pile leg by using the prior art, the following problems exist: (1) the welding requirement of the high-strength steel of the rack is difficult to ensure; (2) the length of the pile leg is long, the difficulty in size measurement and control is high, and the construction requirement that the clearance between the pile leg and the single side of the inner part of the enclosing well is only 6mm is difficult to ensure during manufacturing and construction; (3) the rack is meshed with a gear in the trap gear box, the welded spud leg has extremely high requirement on the precision of the rack, a cylinder body of the spud leg cannot be a theoretical regular cylinder in the manufacturing process, and the assembly of the rack and the precision after welding are difficult to ensure in the prior art; (4) the cylindrical pile leg of the existing self-elevating marine platform is generally 70-90 m long, is limited by a field and hoisting equipment, and is long in manufacturing period and difficult to guarantee in precision.
It will thus be seen that the prior art is susceptible to further improvements and enhancements.
Disclosure of Invention
The invention provides a method for manufacturing a cylindrical pile leg of a self-elevating offshore platform, which can be used for manufacturing the pile leg in a limited construction period and enabling the welding quality and the welding precision of the pile leg to reach the specified requirements in order to avoid the defects of the prior art.
The technical scheme adopted by the invention is as follows:
a manufacturing method of a cylindrical pile leg of a self-elevating marine platform comprises the following steps:
step 1, assembling and manufacturing the cylinder in sections: on the premise of ensuring the ovality of the cylinder body, the cylinder body is rolled and assembled and welded with the internal structure; carrying out small group assembly on the cylinders by taking the three-section cylinder as a unit, and carrying out large group lengthening on a plurality of groups of three-section cylinders after the small group assembly is finished to obtain a segmented cylinder;
step 2, lengthening the rack: the method comprises the following steps of manufacturing a rack in a segmented mode, cutting a plurality of rack embedding sections from the rack before manufacturing the rack in the segmented mode, welding and lengthening each segmented rack on a jig frame after manufacturing the segmented rack, and obtaining a plurality of groups of lengthened rack sections, wherein the length of each lengthened rack section is equal to that of a segmented cylinder;
step 3, welding the lengthened rack section and the sectional barrel in a sectional mode: selecting one lengthened rack section as a rack reference section, welding the rack reference section with a corresponding segmented barrel, pre-installing two lengthened rack sections and rack embedding sections adjacent to the rack reference section by taking the welded rack reference section and the segmented barrel as references after welding is completed, wherein the rack embedding sections are positioned between the two adjacent lengthened rack sections, welding the segmented barrel corresponding to the lengthened rack sections after pre-installing is completed, and so on, taking the lengthened rack section and the segmented barrel which are connected in the previous section as reference sections, pre-installing the lengthened rack section and the rack embedding section of the next segment until all the lengthened rack sections and the segmented barrel are welded;
step 4, putting the pile leg into the surrounding well: and (5) after the lengthening rack section and the segmented cylinder are lengthened and folded, obtaining the pile leg, and inserting the pile leg into the enclosing well.
In step 1, can produce the extension volume at the in-process to barrel edge rolling processing, take place for avoiding the condition of trimming the barrel while edge rolling, when the barrel unloading of earlier stage, need subtract 9 ~ 11mm of extension volume unloading of barrel edge rolling and target in place, do not leave the section of bending in advance.
In the step 2, the welding between the segmented racks is the American Lincoln welding rod CONARC 85.
In the step 3, CHE58-1 welding rod priming and GFL-71Ni carbon dioxide medicinal welding wire capping are adopted for welding between the lengthened rack segment and the segmented cylinder.
In the step 2, in the welding process of the segmented racks, the tooth pitch of each segmented rack needs to be controlled, and the control of the tooth pitch can be realized by the following method: and measuring the shrinkage of the sectional rack after welding during welding by directly using the welding evaluation time and a test plate of a welding test, so as to determine the tooth pitch before welding and ensure that the tooth pitch after welding is within the theoretical tooth pitch deviation range.
In step 3, when the assembly welding of the extension rack section and the segmented cylinder body is carried out, a rack positioning tool is needed, the rack positioning tool comprises code plates which are uniformly distributed along the length direction of the extension rack section, each code plate is in a door shape, a rack heating belt is clamped between every two adjacent code plates, and a welding hole is formed in each code plate.
The rack positioning tool further comprises wedge block groups used for limiting the extension rack sections to move, the number of the wedge block groups is equal to that of the code plates, each wedge block group comprises a plurality of wedge blocks used for limiting the rack sections to move, one end of each wedge block is connected with the code plates, and the other end of each wedge block is connected with the rack sections in a butting mode.
In the step 3, before the elongated rack segment and the segmented cylinder are welded, a backing plate needs to be additionally arranged between the elongated rack segment and the segmented cylinder, and deposited metal cannot contact with the backing plate during welding.
In the step 1, the material of the cylinder body is EH36 steel; in the step 2, the material of the rack is A514GRQ steel.
In the step 2 and the step 3, before the barrel is subjected to segmented assembly and welding and the rack is welded and lengthened, preheating EH36 steel and A514GRQ steel before welding is carried out, wherein the preheating temperature is 150-170 ℃; in the step 2 and the step 3, after welding, post-heating is carried out on the welded lengthened rack section and the segmented cylinder, the post-heating temperature is 230 ℃, the temperature is reduced to 50 ℃ after 2-3 hours of heat preservation, and after the post-heating is finished, the lengthened rack section and the segmented cylinder are placed in the air for natural cooling.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention can realize the simultaneous construction of a plurality of sections of the same pile leg, the lower pile leg which is made first can be firstly assembled and folded with the pile shoe and the enclosing well, the onshore lifting test and the like, thereby greatly saving the construction period and ensuring the project progress.
2. The rack is relatively large in elongation due to heating during welding, each section is extended by about 30-40 mm, the embedding sections are adopted for pre-installation before welding, the problem that the welding shrinkage of the rack is inconsistent with that of a barrel body due to extension is effectively solved, and stress concentration is effectively avoided.
3. The invention can simultaneously and crossly work among all working procedures, greatly shortens the manufacturing period of the pile leg, solves the technical problem in the manufacturing process of the cylindrical pile leg, ensures that the welding quality and the welding precision in the manufacturing process are controllable and effective, and is a powerful guarantee that the self-elevating marine platform can safely, smoothly and accurately run in the lifting test and the subsequent use process.
Drawings
Fig. 1 is a schematic view of a rack positioning tool in the invention.
FIG. 2 is a schematic view of the welding between the rack and the barrel according to the present invention.
Fig. 3 is a schematic diagram of the present invention for ensuring the leg radius using an optical theodolite.
Fig. 4 is a schematic view of the use of the invention for sectional folding of legs.
Wherein,
1. barrel 1.1, first subsection barrel 1.2, second subsection barrel 1.3, third subsection barrel 1.4, fourth subsection barrel 2, rack 2.1, first rack section 2.2, second rack section 2.3, third rack section 2.4, fourth rack section 3, wedge 4, code plate 5, backing plate 6, rack embedding section
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific examples, but the present invention is not limited to these examples.
As shown in fig. 1 to 4, a method for manufacturing a cylindrical leg of a jack-up offshore platform includes the following steps:
step 1, assembling and manufacturing the cylinder in sections: on the premise of ensuring the ovality of the cylinder body, the cylinder body is rolled and assembled and welded with the internal structure; carrying out small group assembly on the cylinders by taking the three-section cylinder as a unit, and carrying out large group lengthening on a plurality of groups of three-section cylinders after the small group assembly is finished to obtain a segmented cylinder;
step 2, lengthening the rack: the method is limited by the manufacturing capacity and the transportation capacity of racks of manufacturers, the purchased racks are usually only seven and eight meters long, so that the racks need to be manufactured in a segmented mode, a plurality of sections of rack embedding sections are firstly cut from the racks before the racks are manufactured in a segmented mode, after the segmented manufacturing is finished, the segmented racks are welded and lengthened on a jig frame, a plurality of groups of lengthened rack sections are obtained, and the length of each lengthened rack section is equal to that of the segmented cylinder;
step 3, welding the lengthened rack section and the sectional barrel in a sectional mode: selecting one section from the lengthened rack sections as a rack reference section, as shown in fig. 4, selecting a second rack section 2.2 as the rack reference section, welding the second rack section 2.2 with a corresponding second sectional barrel 1.2, pre-installing adjacent first sectional barrel 1.1 and rack sections 2.1, and third sectional barrel 1.3 and rack sections 2.3 with the welded second rack section 2.2 and second sectional barrel 1.2 as references, pre-installing rack embedding sections 6 at two ends of the second rack section 2.2 respectively before welding, pre-installing the two sectional racks and barrels after welding, and simultaneously welding four persons during welding to ensure synchronization and no lateral bending of the racks; after welding is finished, pre-installing a fourth rack section 2.4 and a fourth sectional barrel 1.4 on the right sides of the third rack section 2.3 and the third sectional barrel 1.3 by taking the third rack section and the fourth sectional barrel as references, and sequentially performing the steps until all the rack sections and the sectional barrels are welded;
and 4, inserting the pile leg into the enclosing well, butting the pile leg with the pile shoe, and performing sectional lengthening and folding on the pile leg after the butt joint is completed. Due to the previous pre-installation process, the data after the pile legs are folded can meet the requirements.
The key point of the quality control of the pile leg is to control the butt joint quality of the rack and the quality of the fillet weld of the rack and the pile leg. The rack 2 is made of A514GRQ with the thickness of 114mm, the yield strength of the material is more than 720Mpa, the rack is high-strength quenched and tempered steel, due to the fact that alloy elements such as Mn, Cr and Mo are added into the steel, cold cracks are easy to generate during welding, a heat affected zone is easy to form a softened zone and a brittle structure under the influence of heating temperature and cooling speed, the barrel 1 is made of EH36 steel, and the material thickness is 40-52 mm.
In the step 2 and the step 3, before the barrel 1 is subjected to segmented group assembling welding and before the rack 2 is welded and lengthened, pre-welding preheating is carried out on EH36 steel and A514GRQ steel, the preheating temperature is 150-170 ℃, the cooling speed of A514GRQ and EH36 steel during martensite transformation is reduced through pre-welding preheating, and the crack resistance of A514GRQ is improved through the self-tempering effect of martensite; because the high-strength quenched and tempered steel A514GRQ is added with alloy elements such as Mn, Cr, Mo and the like, cold cracks are easy to generate during welding, and a heat affected zone is easy to form a softened zone and a brittle tissue under the influence of heating temperature and cooling speed, so that the preheating temperature is not too high, otherwise, the crack is prevented, the cooling speed at 800-500 ℃ is lower than the critical cooling speed at which a brittle mixture tissue appears, and the toughness of the welding heat affected zone is greatly reduced, therefore, the preheating temperature is preferably 150 ℃, 160 ℃ or 170 ℃;
selection of welding materials: the hydrogen comes from the hydrogen content of the welding material besides the moisture of the welding material, the rust and the oil stain at the welding groove, the hydrogen content is needed to be used for welding the ultrahigh-strength steel, and the following welding materials are selected after a plurality of welding tests: AWS A5.5E 12018-G-H4R is selected for welding the segmented racks; welding between the lengthened rack segment and the segmented cylinder is primed by an AWS A5.1A 7018-1 welding rod, and covered by an AWS A5.20E 71T-1C-J welding wire; preferably, the welding between the segmented racks is performed by using a United states Lincoln welding rod CONARC 85; the welding between the lengthened rack segment and the segmented cylinder adopts CHE58-1 welding rod for priming and GFL-71Ni carbon dioxide medicinal welding wire for covering;
controlling the interlayer temperature: the lengthened rack segment and the segmented cylinder are respectively welded according to the length and the lifting capacity of the required pile leg, and in order to ensure that the impact power is more than 47J, the lengthened rack segment and the segmented cylinder are respectively welded by a welding method with small linear energy during welding, so that a welding heat affected zone and weld metal have better toughness, and welding deformation can be reduced; during welding, interlayer temperature is strictly controlled, the interlayer temperature has the same effect as preheating, the minimum interlayer temperature is 75 ℃, and the maximum interlayer temperature is 200 ℃;
postweld heat: a514GRQ steel alloying element is a mixed structure which is high in strength and good in toughness and is obtained by adding a plurality of alloy elements for improving hardenability on the basis of low carbon, so that the cooling speed cannot be too high, the welded long-jointed rack section and the segmented cylinder body need to be heated after welding is completed, repeated tests prove that the thermal parameters are thermal parameters, namely the rear heating temperature is 230 ℃, the temperature is reduced to 50 ℃ after heat preservation is carried out for 2-3 hours, and after the rear heating is completed, the rack section and the segmented cylinder body are placed in the air for natural cooling, so that hydrogen can escape conveniently, and cold cracks are prevented.
In step 1, can produce certain extension volume at the in-process of carrying out the edge rolling processing to barrel 1, take place for avoiding the condition of repairing cutting barrel 1 while edge rolling, when barrel 1 unloading of earlier stage, need subtract the 9 ~ 11mm unloading of extension volume of barrel 1 edge rolling and target in place, do not leave the section of bending in advance.
In the step 1, the theoretical diameter of the pile leg is 3300mm, but during construction, the theoretical roundness and the diameter cannot be achieved, and a standard cylinder cannot be manufactured, and in order to ensure a unilateral gap of 6mm between the finished pile leg and the trap, the diameter tolerance of the rolled pile leg is set to be 3298 +/-1 mm in advance, so that the diameter of the pile leg is prevented from being larger than the theoretical value. In order to ensure the clearance between the pile leg and the enclosing well when the inserted pile is closed and ensure the smooth closing and lifting test, the diameter of the pile leg needs to be accurately controlled. As shown in FIG. 3, the center O of the upper and lower ports of the cylinder 1 is adjusted1、O2Guarantee O1、O2On the same horizontal plane, a horizontal plane A is arranged above or below the cylinder body 1 by an optical theodolite, the outer diameter R1 at the end of the cylinder body and the vertical distance L1 from a measuring point to the horizontal plane A are measured, Rn + Ln at any position on other vertical cross sections can be known to be R1+ L1, the outer diameter Rn at any point on the vertical cross sections can be deduced to be R1+ L1-Ln, and the radius of the pile leg becomes a controllable value; controlling two positions of the barrel 1 for installing the racks 2, and controlling the radius of the end faces at two ends of the barrel 1 and the straightness of the circle centers of the end faces at two ends, wherein the radius measurement and control are performed in the process of constructing and folding the whole pile leg in sections.
The lifting performance of the marine platform mainly depends on the transmission precision, and the transmission precision is mainly ensured by the installation precision of a gear box in the trap and the precision of a pile leg rack. The difficulty of the precision control of the rack 2 lies in that the welded rack 2 with the length of 70-90 meters reaches the effect of machining by a welding method. The precision control of the rack 2 mainly comprises the following steps: control of the pitch, limitation of the freedom of the rack and compensation of the pitch of the tooth tops.
Controlling the tooth pitch: in the step 2, in the welding lengthening process of the segmented racks, the tooth pitch of each segmented rack needs to be controlled, and the control of the tooth pitch can be realized by the following method: by utilizing the welding evaluation time, the shrinkage of the rack 2 after welding is directly measured and calculated through a test plate of a welding test, so that the tooth pitch before welding is determined, and the tooth pitch after welding can be ensured to be within the theoretical tooth pitch deviation range.
Control of the degree of freedom of the rack 2: in the step 3, as shown in fig. 1, when the elongated rack segment and the segmented barrel are assembled and welded, a rack positioning tool is needed, the rack positioning tool comprises code plates 4 uniformly distributed along the length direction of the elongated rack segment, each code plate 4 is in a door shape, a rack heating belt is clamped between every two adjacent code plates 4, and each code plate 4 is provided with an over-welding hole; the rack positioning tool further comprises wedge block groups used for limiting the extension rack section to move, the number of the wedge block groups is equal to that of the code plates 4, each wedge block group comprises a plurality of wedge blocks 3 used for limiting the rack section to move, one end of each wedge block 3 is connected with the code plates 4, and the other end of each wedge block is connected with the extension rack section in a butting mode.
Controlling the tooth top distance: because the outer diameters of all parts of the pile legs cannot reach a uniform or standard value actually during manufacturing, during general manufacturing, the outer diameter of the cylinder body 1 needs to be smaller than the size required by a drawing to ensure the fit clearance with the enclosure, if the rack 2 is directly assembled and welded with the pile legs, the tooth top distance of the welded rack 2 is easy to be smaller, if the tooth top distance is smaller than a required value, the clearance between the rack 2 and a gear in a gear box of the enclosure is increased to cause danger, in order to compensate the loss of the radius of the pile legs, as shown in fig. 2, before the elongated rack section and the segmented cylinder are assembled and welded, a backing plate 5 needs to be additionally arranged between the elongated rack section and the segmented cylinder, and deposited metal cannot be in contact with the backing plate 5 during welding, so that the tooth top distance of the welded rack 2 is ensured.
Parts which are not described in the invention can be realized by adopting or referring to the prior art.
Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. A manufacturing method of a cylindrical pile leg of a self-elevating marine platform is characterized by comprising the following steps:
step 1, assembling and manufacturing the cylinder in sections: on the premise of ensuring the ovality of the cylinder body, the cylinder body is rolled and assembled and welded with the internal structure; carrying out small group assembly on the cylinders by taking the three-section cylinder as a unit, and carrying out large group lengthening on a plurality of groups of three-section cylinders after the small group assembly is finished to obtain a segmented cylinder;
step 2, lengthening the rack: the method comprises the following steps of manufacturing a rack in a segmented mode, cutting a plurality of rack embedding sections from the rack before manufacturing the rack in the segmented mode, welding and lengthening each segmented rack on a jig frame after manufacturing the segmented rack, and obtaining a plurality of groups of lengthened rack sections, wherein the length of each lengthened rack section is equal to that of a segmented cylinder;
step 3, welding the lengthened rack section and the sectional barrel in a sectional mode: selecting one lengthened rack section as a rack reference section, welding the rack reference section with a corresponding segmented barrel, pre-installing two lengthened rack sections and rack embedding sections adjacent to the rack reference section by taking the welded rack reference section and the segmented barrel as references after welding is completed, wherein the rack embedding sections are positioned between the two adjacent lengthened rack sections, welding the segmented barrel corresponding to the lengthened rack sections after pre-installing is completed, and so on, taking the lengthened rack section and the segmented barrel which are connected in the previous section as reference sections, pre-installing the lengthened rack section and the rack embedding section of the next segment until all the lengthened rack sections and the segmented barrel are welded;
step 4, putting the pile leg into the surrounding well: and (5) after the lengthening rack section and the segmented cylinder are lengthened and folded, obtaining the pile leg, and inserting the pile leg into the enclosing well.
2. The method for manufacturing the self-elevating marine platform cylindrical spud leg according to claim 1, wherein in step 1, an extension amount is generated in the process of rolling the cylinder, and in order to avoid trimming the cylinder while rolling, 9-11 mm of the extension amount of the cylinder rolling needs to be subtracted during the previous blanking of the cylinder, so that the blanking is in place, and a pre-bent section is not left.
3. The method of claim 1, wherein in step 2, the welding between the segmented racks is performed by a welding method using a welding rod CONARC 85.
4. The method for manufacturing the self-elevating offshore platform cylindrical leg according to claim 1, wherein in the step 3, CHE58-1 electrode backing and GFL-71Ni carbon dioxide flux welding wire facing are selected for welding between the extension rack segment and the segment cylinder.
5. The method of claim 1, wherein in step 2, during the welding of the segmented racks, the pitch of each segmented rack needs to be controlled, and the pitch control can be achieved by the following method: and measuring the shrinkage of the sectional rack after welding during welding by directly using the welding evaluation time and a test plate of a welding test, so as to determine the tooth pitch before welding and ensure that the tooth pitch after welding is within the theoretical tooth pitch deviation range.
6. The method for manufacturing the cylindrical pile leg of the self-elevating offshore platform according to claim 1, wherein in the step 3, when the lengthened rack section and the segmented cylinder are assembled and welded, a rack positioning tool is needed, the rack positioning tool comprises code plates uniformly distributed along the length direction of the lengthened rack section, each code plate is in a door shape, a rack heating belt is clamped between every two adjacent code plates, and each code plate is provided with a welding hole.
7. The method for manufacturing the cylindrical pile leg of the self-elevating offshore platform according to claim 6, wherein the rack positioning tool further comprises wedge blocks for limiting the movement of the long connecting rack segment, the number of the wedge blocks is equal to that of the stacking plates, each wedge block group comprises a plurality of wedge blocks for limiting the movement of the rack segment, one end of each wedge block is connected with the stacking plates, and the other end of each wedge block abuts against the rack segment.
8. The method of claim 1, wherein in step 3, before the elongated rack segment is welded to the segment cylinder, a backing plate is added between the elongated rack segment and the segment cylinder, and the deposited metal does not contact the backing plate during welding.
9. The method for manufacturing the self-elevating offshore platform cylindrical leg according to claim 1, wherein in the step 1, the cylinder is made of EH36 steel; in the step 2, the material of the rack is A514GRQ steel.
10. The method for manufacturing the self-elevating offshore platform cylindrical pile leg according to claim 9, wherein in the step 2 and the step 3, before the barrel is subjected to segmented group assembling welding and before the rack is subjected to welding lengthening, the EH36 steel and the A514GRQ steel are preheated before welding, and the preheating temperature is 150-170 ℃; in the step 2 and the step 3, after welding, post-heating is carried out on the welded lengthened rack section and the segmented cylinder, the post-heating temperature is 230 ℃, the temperature is reduced to 50 ℃ after 2-3 hours of heat preservation, and after the post-heating is finished, the lengthened rack section and the segmented cylinder are placed in the air for natural cooling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510796018.1A CN105234575B (en) | 2015-11-18 | 2015-11-18 | Manufacturing method for self-elevating type offshore platform cylindrical pile leg |
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| CN201510796018.1A CN105234575B (en) | 2015-11-18 | 2015-11-18 | Manufacturing method for self-elevating type offshore platform cylindrical pile leg |
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| CN108480873A (en) * | 2018-06-01 | 2018-09-04 | 南通振华重型装备制造有限公司 | A kind of folding method of jack up wind-powered electricity generation mounting platform spud leg epimere and spud leg hypomere |
| CN110480261A (en) * | 2019-07-30 | 2019-11-22 | 南通振华重型装备制造有限公司 | A kind of broken stone leveling ship spud leg building technology |
| CN112077469B (en) * | 2020-08-25 | 2022-04-15 | 广东工业大学 | Method for continuously preheating and welding and installing giant maritime work pile leg in field and in multiple sections |
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| EP0693593B1 (en) * | 1994-07-19 | 1999-12-22 | Technip France | Method for assembling very long parts of sheet metal girders for the legs of an oilplatform |
| CN101225653B (en) * | 2007-10-22 | 2010-07-07 | 大连船舶重工集团有限公司 | Construction welding method for main chord pipe inside platform legs |
| CN102416554B (en) * | 2011-09-28 | 2013-07-24 | 南通润邦海洋工程装备有限公司 | Technology for making pile legs of wind power installation ship |
| CN102528236A (en) * | 2012-01-17 | 2012-07-04 | 武汉船用机械有限责任公司 | Welding method and welding jig for pile leg single-face rack |
| 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 |
| CN104005392B (en) * | 2014-05-20 | 2016-04-06 | 大连船舶重工集团海洋工程有限公司 | Jack-up unit truss leg semi-circular plate more exchange device and replacing options thereof |
| CN104878732B (en) * | 2015-04-21 | 2017-03-08 | 南通蓝岛海洋工程有限公司 | A kind of drilling platform leg wedge bracket and its processing technology |
| CN104889682B (en) * | 2015-05-25 | 2017-09-01 | 南通中远船务工程有限公司 | A kind of spud leg sectional construction method |
| CN104999187A (en) * | 2015-07-13 | 2015-10-28 | 渤海船舶重工有限责任公司 | Permanent locating segment assembling and welding method for rack and leg of drilling platform |
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