CN105234575A - 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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- CN105234575A CN105234575A CN201510796018.1A CN201510796018A CN105234575A CN 105234575 A CN105234575 A CN 105234575A CN 201510796018 A CN201510796018 A CN 201510796018A CN 105234575 A CN105234575 A CN 105234575A
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- tooth bar
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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 maritime platform manufacturing technology field, particularly relate to a kind of manufacture method of jack up maritime platform cylindrical leg.
Background technology
Jack up maritime platform is mainly used in cooperation and creeps into platform well drilling, field produces service, offshore oilfield construction, oilfield stimulation, workover treatment, life support, wind-powered electricity generation installation etc.For self-elevating drilling platform, it is mounted with drilling machinery, power, equipment, the some liftable spud legs of accommodation one-level, during drilling well, the end, in the shoe bottom spud leg, and platform then lifts away from sea certain altitude along spud leg; During displacement, the water surface is down to by platform, and spud leg rises, and platform, just as barge, can be dragged to new well location by tugboat it.Visible, spud leg is the key position of jack up maritime platform, when jack up maritime platform implement operation time, need by elevating mechanism by platform raising to sea above safe altitude, then carry out the pitching pile of spud leg, and support whole platform by shoe.
At present, the primary structure form of jack up maritime platform cylindrical leg is columniform cylindrical shell additional both sides tooth bars, jacking system is the key that whole jack-up unit can be elevated smoothly, spud leg is as the primary structure of jacking system, be no matter welding quality or its precision controlling of spud leg, all seem particularly important.
Utilize prior art to manufacture in the process of spud leg, there is following problem: (1), be difficult to ensure the welding demand of tooth bar high-strength steel; (2), spud leg length is long, and dimensional measurement, to control difficulty large, is difficult to ensure spud leg and the construction demand in gap of enclosing trap inner monolateral only 6mm when making construction; (3), tooth bar and the gears meshing that encloses in trap gear-box, the requirement of spud leg after having welded to tooth bar precision is high, and the cylindrical shell of spud leg can not be the cylindrical of a theoretical rule in the fabrication process, prior art is difficult to ensure the precision after the assembling of tooth bar and welding; (4), the columniform spud leg of existing jack up maritime platform generally has 70m ~ 90m long, and be limited to place and crane gear, the fabrication cycle of spud leg is long, and precision is difficult to guarantee.
As can be seen here, prior art awaits further improving.
Summary of the invention
The present invention is the weak point avoiding above-mentioned prior art to exist, provide a kind of manufacture that can complete spud leg within the limited duration, and make the welding quality of spud leg and welding precision all reach the manufacture method of the jack up maritime platform cylindrical leg that regulation requires.
The technical solution adopted in the present invention is:
A manufacture method for jack up maritime platform cylindrical leg, comprises the steps:
Step 1, the group of cylindrical shell to sectional making: under the prerequisite ensureing cylindrical shell ovality, by cylindrical shell volume circle and its internal structure of erection welding; In units of three joint cylindrical shells, carry out group's group pair of cylindrical shell again, group's group saves to many groups three the large group of spreading that cylindrical shell carries out segmentation after completing, and obtains segmentation cylindrical shell;
Step 2, the spreading of tooth bar: sectional making is carried out to tooth bar, before tooth bar sectional making, first intercept the embedding benefit section of multistage tooth bar from tooth bar, after sectional making completes, on moulding bed, carry out welding spreading to each segmentation tooth bar, obtain many group spreading rack segments, the length of each spreading rack segments is suitable with the length of above-mentioned segmentation cylindrical shell;
Step 3, the segmentation welding equipment of spreading rack segments and segmentation cylindrical shell: choose one section of spreading rack segments as tooth bar benchmark section, this tooth bar benchmark section is welded with corresponding segmentation cylindrical shell, after having welded with the tooth bar benchmark section of welding and cylinder section for benchmark pre-installs two the spreading rack segments and the embedding benefit section of tooth bar be adjacent, tooth bar embedding benefit section is positioned between two adjacent spreading rack segments, pre-install the segmentation cylindrical shell that rear welding is corresponding with spreading rack segments, by that analogy, the spreading rack segments connected with the preceding paragraph and segmentation cylindrical shell are benchmark section, pre-install spreading rack segments and the embedding benefit section of tooth bar of next segmentation, until all spreading rack segments and segmentation barrel soldering are completed,
Step 4, spud leg is shortlisted for trap: obtain spud leg after spreading rack segments and segmentation cylindrical shell spreading have closed up, and is inserted by spud leg and encloses trap.
In described step 1, can produce extensible extent in the process to the processing of cylindrical shell volume circle, for avoiding the situation of limit coiled round edge mowing cylindrical shell to occur, when the cylindrical shell blanking in early stage, extensible extent 9 ~ 11mm blanking that need deduct cylindrical shell volume circle puts in place, does not stay pre-curved segment.
In described step 2, that welding between segmentation tooth bar with segmentation tooth bar is selected is U.S. Lincoln welding rod CONARC85.
In described step 3, what welding between spreading rack segments with segmentation cylindrical shell was selected is the bottoming of CHE58-1 welding rod, GFL-71Ni carbon dioxide property of medicine welding wire capping.
In described step 2, in the welding process of segmentation tooth bar, need control the tooth pitch of each segmentation tooth bar, the control of tooth pitch can be realized by following method: utilize the opportunity of welding and commenting, directly calculate segmentation tooth bar when welding by the test plate (panel) of soldering test, the amount of contraction of postwelding, determines weldering nipper distance thus, just can ensure that the tooth pitch of postwelding is within the scope of theoretical circular pitch deviation.
In described step 3, when carrying out the welding equipment of spreading rack segments and cylinder section, need by tooth bar positioning tool, this tooth bar positioning tool comprises along the uniform code plate of spreading rack segments length direction, each code plate is all in gate, be folded with tooth bar heating tape between adjacent code plate, each code plate all offered welding hole.
Described tooth bar positioning tool also comprises the voussoir group for limiting the movement of spreading rack segments, the quantity of voussoir group is equal with the quantity of code plate, each voussoir group includes the voussoir of polylith restriction rack segments movement, and one end of each voussoir is connected with code plate, the other end and rack segments abut against.
In described step 3, before the welding equipment of carrying out spreading rack segments and cylinder section, backing plate need be set up between spreading rack segments and cylinder section, and welding time deposited metal must not with pad contact.
In described step 1, the material of cylindrical shell is EH36 steel; In described step 2, the material of tooth bar is A514GRQ steel.
In described step 2 and step 3, before carrying out segmentation welding to cylindrical shell and before carrying out welding spreading to tooth bar, need carry out weld preheating to EH36 steel, A514GRQ steel, preheat temperature is 150 ~ 170 DEG C; In described step 2 and step 3, after having welded, the spreading rack segments needing butt welding to connect and cylinder section carry out after heat, and after postheat temperature 230 DEG C is incubated 2 ~ 3 hours, temperature is down to 50 DEG C, after after heat completes, spreading rack segments and cylinder section are put and naturally cools in atmosphere.
Owing to have employed technique scheme, the beneficial effect acquired by the present invention is:
1, construct while utilizing the present invention can realize several segmentations of same pile leg, the spud leg below first ready-made can first carry out closing up with shoe, the general assembly of enclosing trap and land lifting is tested, and greatly saves the duration, has ensured project process.
2, tooth bar is when welding because of comparatively large by thermal expansion length, and every section is about extended 30 ~ 40mm, adopts embedding benefit section and carries out welding front prepackage, efficiently avoid tooth bar and extends the problem inconsistent with barrel soldering amount of contraction brought, and efficiently avoid stress and concentrates.
3, the present invention is utilized can to make cross-operation simultaneously between each operation, substantially reduce the manufacturing cycle of spud leg, and the technical problem solved in cylindrical leg manufacture process, welding quality in manufacture process and precision become controlled and effective, are the powerful guarantees that jack up maritime platform can safely, smoothly and accurately run in lifting test and follow-up use procedure.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of middle rack positioning tool of the present invention.
Fig. 2 is the welding equipment schematic diagram of middle rack of the present invention and cylindrical shell.
Fig. 3 is the schematic diagram utilizing micrometer instrument to ensure spud leg radius in the present invention.
Fig. 4 is the schematic diagram utilizing the present invention to carry out segment folding spud leg.
Wherein,
1, cylindrical shell 1.1, first cylinder section 1.2, second cylinder section 1.3, the 3rd cylinder section 1.4, the 4th cylinder section 2, tooth bar 2.1, first rack segments 2.2, second rack segments 2.3, the 3rd rack segments 2.4, the 4th rack segments 3, voussoir 4, code plate 5, backing plate 6, the embedding benefit section of tooth bar
Detailed description of the invention
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described in further detail, but the present invention is not limited to these embodiments.
As shown in Figures 1 to 4, a kind of manufacture method of jack up maritime platform cylindrical leg, comprises the steps:
Step 1, the group of cylindrical shell to sectional making: under the prerequisite ensureing cylindrical shell ovality, by cylindrical shell volume circle and its internal structure of erection welding; In units of three joint cylindrical shells, carry out group's group pair of cylindrical shell again, group's group saves to many groups three the large group of spreading that cylindrical shell carries out segmentation after completing, and obtains segmentation cylindrical shell;
Step 2, the spreading of tooth bar: the making ability and the transport capacity that are limited to producer's tooth bar, the tooth bar bought often only has seven or eight meters long, therefore need to carry out sectional making to tooth bar, before tooth bar sectional making, first intercept the embedding benefit section of multistage tooth bar from tooth bar, after sectional making completes, on moulding bed, carry out welding spreading to each segmentation tooth bar, obtain many group spreading rack segments, the length of each spreading rack segments is suitable with the length of above-mentioned segmentation cylindrical shell;
Step 3, the segmentation welding equipment of spreading rack segments and segmentation cylindrical shell: choose one section as tooth bar benchmark section from spreading rack segments, as shown in Figure 4, second rack segments 2.2 is elected to be tooth bar benchmark section, this second rack segments 2.2 is welded with the second corresponding cylinder section 1.2, after having welded with the second rack segments 2.2 welded and the second cylinder section 1.2 for benchmark pre-installs adjacent cylinder section 1.1 and rack segments 2.1, cylinder section 1.3 and rack segments 2.3, before welding, the embedding benefit section 6 of tooth bar need be pre-installed respectively at the two ends of the second rack segments 2.2, pre-install the rear welding tooth bar of these two segmentations and cylindrical shell again, during welding, need four people welding simultaneously, to ensure the synchronous of tooth bar and not lateral bending, after having welded, then be that benchmark pre-installs the 4th rack segments 2.4 and the 4th cylinder section 1.4 on both right sides with the 3rd rack segments 2.3 and the 3rd cylinder section 1.3, so sequentially carry out, until all rack segments have been welded with cylinder section,
Step 4, spud leg docks with shoe after inserting and enclosing trap, and after having docked, spreading spud leg being carried out to segmentation closes up.Due to pre-process of assembling before, the data after spud leg folding all can reach requirement.
The emphasis of the quality control of spud leg controls the quality of tooth bar docking and the quality of tooth bar and spud leg angle welding.The material of tooth bar 2 is A514GRQ, thickness is 114mm, the yield strength of this material is greater than 720Mpa, that the quenching of a kind of high strength adds temper steel, the alloying elements such as Mn, Cr, Mo are added due to steel grade, easily cold crack is produced during welding, heat affected area easily forms zone of transformation and friable tissues by the impact of heating-up temperature and cooling velocity, and cylindrical shell 1 is EH36 steel, material thickness 40-52mm.
In described step 2 and step 3, before segmentation welding is carried out to cylindrical shell 1 and before welding spreading is carried out to tooth bar 2, weld preheating need be carried out to EH36 steel, A514GRQ steel, preheat temperature is 150 ~ 170 DEG C, cooling velocity when reducing martensite transfor mation in A514GRQ, EH36 steel by weld preheating, improves the crack resistance of A514GRQ simultaneously by martensitic self tempering effect; Because adding the alloying elements such as Mn, Cr, Mo in this high strength quenching of A514GRQ add-back thermal transfer steel, easily cold crack is produced during welding, heat affected area easily forms zone of transformation and friable tissues by the impact of heating-up temperature and cooling velocity, therefore preheat temperature is unsuitable too high, otherwise it is not only unfavorable to preventing crackle, the cooling velocity of 800 ~ 500 DEG C more can be made lower than the critical cooling rate occurring fragility mixture tissue, the toughness of welding heat affected zone is reduced greatly, therefore, preferred preheat temperature is 150 DEG C, 160 DEG C or 170 DEG C;
The selection of welding material: hydrogen is except deriving from the moisture of welding material, the iron rust at bevel for welding place, greasy dirt, also derive from the hydrogen content of welding material, the welding of super-high strength steel needs to use hydrogen content, through multiple welding test, select following welding material: welding between segmentation tooth bar with segmentation tooth bar selects AWSA5.5E12018-G-H4R; Welding between spreading rack segments with segmentation cylindrical shell selects the bottoming of AWSA5.1A7018-1 welding rod, selects AWSA5.20E71T-1C-J welding wire capping; As preferably, that welding between segmentation tooth bar with segmentation tooth bar is selected is U.S. Lincoln welding rod CONARC85; What welding between spreading rack segments with segmentation cylindrical shell was selected is the bottoming of CHE58-1 welding rod, GFL-71Ni carbon dioxide property of medicine welding wire capping;
The control of interlayer temperature: respectively segmentation welding is carried out to spreading rack segments, segmentation cylindrical shell according to the length of required spud leg and lifting capacity, and in order to ensure that ballistic work is greater than 47J, the welding method of little heat input is selected to weld respectively spreading rack segments and segmentation cylindrical shell during welding, welding heat affected zone and weld metal so not only can be made to have good toughness, can also welding deformation be reduced; During welding, strictly need control interlayer temperature, interlayer temperature plays a part same with preheating, and minimum interlayer temperature is 75 DEG C, and maximum interlayer temperature is 200 DEG C;
This kind of firm alloy element of postwelding after heat: A514GRQ ensures that acquisition intensity is high by the alloying element adding multiple raising quenching degree on the basis of low-carbon (LC), the low-carbon martensite of good toughness and the line and staff control of part bainite, therefore, cooling velocity can not be too fast, need after welding completes, the spreading rack segments that butt welding connects and segmentation cylindrical shell carry out after heat, thermal parameter after validation trial, namely postheat temperature 230 DEG C and after being incubated 2 ~ 3 hours temperature be down to 50 DEG C, after after heat completes, rack segments and cylinder section are put and naturally cools in atmosphere, the object done like this is conducive to the effusion of hydrogen, prevent cold crack.
In described step 1, certain extensible extent can be produced, for avoiding the situation of limit coiled round edge mowing cylindrical shell 1 to occur, when cylindrical shell 1 blanking in early stage in the process of cylindrical shell 1 being rolled up to circle processing, extensible extent 9 ~ 11mm blanking that need deduct cylindrical shell 1 volume circle puts in place, does not stay pre-curved segment.
In described step 1, the theoretical diameter of spud leg is 3300mm, but during construction, theoretical circularity and diameter can not be reached, the cylinder of a standard can not be made, in order to spud leg after ensureing to complete and the monolateral gap of enclosing 6mm between trap, formulate the diameter tolerance after spud leg volume circle in advance at 3298 ± 1mm, be greater than theoretical value to avoid spud leg diameter.During for ensureing that pitching pile closes up, spud leg and the gap of enclosing trap, guarantee to close up and be elevated carrying out smoothly of test, needs the diameter accurately controlling spud leg.As shown in Figure 3, the center of circle O of the upper and lower mouth of cylindrical shell 1 is adjusted
1, O
2, ensure O
1, O
2in same level, with micrometer instrument above cylindrical shell 1 or below make a call to a horizontal plane A, measure the external diameter R1 of cylindrical shell end and the vertical distance L1 of measurement point distance horizontal plane A, the Rn+Ln=R1+L1 of optional position on other this vertical section known, can release the external diameter Rn=R1+L1-Ln of arbitrfary point on this vertical section, the radius of spud leg becomes one can control value; Control two positions of cylindrical shell 1 being installed tooth bar 2, and with the radius of cylindrical shell 1 two ends end face and the linearity in the end face center of circle, two ends, the measurement of radius and control through whole spud leg sectional construction and close up in process.
The lifting performance of maritime platform depends primarily on transmission accuracy, and transmission accuracy is mainly ensured by the precision of the installation accuracy and spud leg tooth bar of enclosing trap middle gear case again.The precision controlling of tooth bar 2, difficult point is, by the method for welding, to make the tooth bar 2 in postwelding 70 ~ 90 meters of length ranges reach mach effect.Tooth bar 2 precision controlling is mainly: the compensation of the control of tooth pitch, the restriction of the tooth bar free degree and tooth top distance.
The control of tooth pitch: in described step 2, in the process of the welding spreading of segmentation tooth bar, need control the tooth pitch of each segmentation tooth bar, the control of tooth pitch can be realized by following method: utilize the opportunity of welding and commenting, directly calculate tooth bar 2 when welding by the test plate (panel) of soldering test, the amount of contraction of postwelding, determines weldering nipper distance thus, just can ensure that the tooth pitch of postwelding is within the scope of theoretical circular pitch deviation.
The control of tooth bar 2DOF: in described step 3, as shown in Figure 1, when carrying out the welding equipment of spreading rack segments and segmentation cylindrical shell, need by tooth bar positioning tool, this tooth bar positioning tool comprises along the uniform code plate 4 of spreading rack segments length direction, each code plate 4, all in gate, is folded with tooth bar heating tape between adjacent code plate 4, each code plate 4 all offered welding hole; Described tooth bar positioning tool also comprises the voussoir group for limiting the movement of spreading rack segments, the quantity of voussoir group is equal with the quantity of code plate 4, each voussoir group includes the voussoir 3 of polylith restriction rack segments movement, and one end of each voussoir 3 is connected with code plate 4, the other end and spreading rack segments abut against.
The control of tooth top distance: because when making, in fact spud leg external diameter everywhere can not reach unified or standard value, during general making, the external diameter of cylindrical shell 1 is less than drawing requirement size with the fit clearance ensured with enclose trap, if tooth bar 2 is direct and spud leg erection welding, easily cause the tooth top of postwelding tooth bar 2 apart from less, if tooth top is apart from being less than required value, then can make tooth bar 2 and the gap of enclosing between the gear in trap gear-box increases and causes danger, in order to compensate the loss of spud leg radius, as shown in Figure 2, before the welding equipment of carrying out spreading rack segments and segmentation cylindrical shell, backing plate 5 need be set up between spreading rack segments and segmentation cylindrical shell, during welding, deposited metal must not contact with backing plate 5, thus ensure the tooth top distance of tooth bar 2 postwelding.
The part do not addressed in the present invention adopts or uses for reference prior art and can realize.
In addition, term " first ", " second ", " the 3rd ", " the 4th " only for describing object, and can not be interpreted as instruction or hint relative importance.
Specific embodiment described herein is only to spiritual example explanation of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (10)
1. a manufacture method for jack up maritime platform cylindrical leg, is characterized in that, comprises the steps:
Step 1, the group of cylindrical shell to sectional making: under the prerequisite ensureing cylindrical shell ovality, by cylindrical shell volume circle and its internal structure of erection welding; In units of three joint cylindrical shells, carry out group's group pair of cylindrical shell again, group's group saves to many groups three the large group of spreading that cylindrical shell carries out segmentation after completing, and obtains segmentation cylindrical shell;
Step 2, the spreading of tooth bar: sectional making is carried out to tooth bar, before tooth bar sectional making, first intercept the embedding benefit section of multistage tooth bar from tooth bar, after sectional making completes, on moulding bed, carry out welding spreading to each segmentation tooth bar, obtain many group spreading rack segments, the length of each spreading rack segments is suitable with the length of above-mentioned segmentation cylindrical shell;
Step 3, the segmentation welding equipment of spreading rack segments and segmentation cylindrical shell: choose one section of spreading rack segments as tooth bar benchmark section, this tooth bar benchmark section is welded with corresponding segmentation cylindrical shell, after having welded with the tooth bar benchmark section of welding and cylinder section for benchmark pre-installs two the spreading rack segments and the embedding benefit section of tooth bar be adjacent, tooth bar embedding benefit section is positioned between two adjacent spreading rack segments, pre-install the segmentation cylindrical shell that rear welding is corresponding with spreading rack segments, by that analogy, the spreading rack segments connected with the preceding paragraph and segmentation cylindrical shell are benchmark section, pre-install spreading rack segments and the embedding benefit section of tooth bar of next segmentation, until all spreading rack segments and segmentation barrel soldering are completed,
Step 4, spud leg is shortlisted for trap: obtain spud leg after spreading rack segments and segmentation cylindrical shell spreading have closed up, and is inserted by spud leg and encloses trap.
2. the manufacture method of a kind of jack up maritime platform cylindrical leg according to claim 1, it is characterized in that, in described step 1, extensible extent can be produced in the process to the processing of cylindrical shell volume circle, occur for avoiding the situation of limit coiled round edge mowing cylindrical shell, when the cylindrical shell blanking in early stage, extensible extent 9 ~ 11mm blanking that need deduct cylindrical shell volume circle puts in place, does not stay pre-curved segment.
3. the manufacture method of a kind of jack up maritime platform cylindrical leg according to claim 1, is characterized in that, in described step 2, that welding between segmentation tooth bar with segmentation tooth bar is selected is U.S. Lincoln welding rod CONARC85.
4. the manufacture method of a kind of jack up maritime platform cylindrical leg according to claim 1, it is characterized in that, in described step 3, what welding between spreading rack segments with segmentation cylindrical shell was selected is the bottoming of CHE58-1 welding rod, GFL-71Ni carbon dioxide property of medicine welding wire capping.
5. the manufacture method of a kind of jack up maritime platform cylindrical leg according to claim 1, it is characterized in that, in described step 2, in the welding process of segmentation tooth bar, need control the tooth pitch of each segmentation tooth bar, the control of tooth pitch can be realized by following method: utilize the opportunity of welding and commenting, directly calculate segmentation tooth bar when welding by the test plate (panel) of soldering test, the amount of contraction of postwelding, determines weldering nipper distance thus, just can ensure that the tooth pitch of postwelding is within the scope of theoretical circular pitch deviation.
6. the manufacture method of a kind of jack up maritime platform cylindrical leg according to claim 1, it is characterized in that, in described step 3, when carrying out the welding equipment of spreading rack segments and cylinder section, need by tooth bar positioning tool, this tooth bar positioning tool comprises along the uniform code plate of spreading rack segments length direction, and each code plate is all in gate, be folded with tooth bar heating tape between adjacent code plate, each code plate all offered welding hole.
7. the manufacture method of a kind of jack up maritime platform cylindrical leg according to claim 6, it is characterized in that, described tooth bar positioning tool also comprises the voussoir group for limiting the movement of spreading rack segments, the quantity of voussoir group is equal with the quantity of code plate, each voussoir group includes the voussoir of polylith restriction rack segments movement, and one end of each voussoir is connected with code plate, the other end and rack segments abut against.
8. the manufacture method of a kind of jack up maritime platform cylindrical leg according to claim 1, it is characterized in that, in described step 3, before the welding equipment of carrying out spreading rack segments and cylinder section, backing plate need be set up between spreading rack segments and cylinder section, and welding time deposited metal must not with pad contact.
9. the manufacture method of a kind of jack up maritime platform cylindrical leg according to claim 1, is characterized in that, in described step 1, the material of cylindrical shell is EH36 steel; In described step 2, the material of tooth bar is A514GRQ steel.
10. the manufacture method of a kind of jack up maritime platform cylindrical leg according to claim 9, it is characterized in that, in described step 2 and step 3, before segmentation welding is carried out to cylindrical shell and before welding spreading is carried out to tooth bar, need carry out weld preheating to EH36 steel, A514GRQ steel, preheat temperature is 150 ~ 170 DEG C; In described step 2 and step 3, after having welded, the spreading rack segments needing butt welding to connect and cylinder section carry out after heat, and after postheat temperature 230 DEG C is incubated 2 ~ 3 hours, temperature is down to 50 DEG C, after after heat completes, spreading rack segments and cylinder section are put and naturally cools in atmosphere.
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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 |
| CN110064858A (en) * | 2018-01-23 | 2019-07-30 | 烟台铁中宝钢铁加工有限公司 | The manufacturing method of truss framed leg segmentation main chord tube |
| 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 |
| CN112077469A (en) * | 2020-08-25 | 2020-12-15 | 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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| CN104889682A (en) * | 2015-05-25 | 2015-09-09 | 南通中远船务工程有限公司 | Pile leg segmented construction method |
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| 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 |
| CN112077469A (en) * | 2020-08-25 | 2020-12-15 | 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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