CN101225653B - Construction welding method for main chord pipe inside platform legs - Google Patents
Construction welding method for main chord pipe inside platform legs Download PDFInfo
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- CN101225653B CN101225653B CN200710157687XA CN200710157687A CN101225653B CN 101225653 B CN101225653 B CN 101225653B CN 200710157687X A CN200710157687X A CN 200710157687XA CN 200710157687 A CN200710157687 A CN 200710157687A CN 101225653 B CN101225653 B CN 101225653B
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Abstract
The invention discloses a construction welding method for a major side pipe in a pile leg, comprising a plurality of connecting sections composed of a plurality of semicircle plates and rack plates. The welding procedure is described as follows: a. the two side semicircle plates are welded with the rack plate into the form of a unilateral U-shaped groove joint, with the semicircle plate positioned in the middle of the rack plate and shorter than the rack plate; b. the terminals of the two sections of rack plate are welded into the form of an unsymmetrical X groove joint; c. a filling semicircle plate is filled in between two connecting sections of semicircle plates in the form of a V-shaped groove joint through welding. The construction welding method for a major side pipe in a pile leg has the advantages that the accessibility of the welding construction is enhanced while the welding joint is reduced; workload is decreased while work efficiency is enhanced and mechanical properties of the welding joint are improved. After welding procedure evaluating test, every index of the mechanical properties of the welding joint meets the requirements of a classification society.
Description
Technical field
The present invention relates to a kind of welding technique, more particularly, relate to the welding technique of local member in a kind of large-scale pile leg structure.
Background technology
Large-scale jack-up unit is mainly used in the exploration and the exploitation of offshore oil/natural gas resource, generally is about 70 meters, wide 76 meters, and dark about 9.5 meters, 1.7 ten thousand tons of construction weights, 122 meters of average operating water depths.Main platform body all supports by spud leg, and whether it reliably is related to the safety of whole platform.Spud leg is shaped as the English truss formula, be provided with at the place, three angles of pile leg structure the band tooth bar main shipboard tube, connect by stay tube therebetween, as shown in Figure 5, comprise two relative semicircle pipes (or title semi-circular plate) 2 and the part 1 that has tooth bar, be connected by structural tube (pipe truss) by 3 toothed rack and form English truss, and be welded by multistage.Wherein, the tooth bar total length can reach about 167 meters, because tooth bar thickness is big, intensity and impact toughness require highly, the welding difficulty is very big, occurs the weld seam shortcoming easily; And welding thereby welding job efficient are lower owing to being difficult to.
Summary of the invention
The present invention solves in the construction of pile leg structure spreading exactly, link technique problem between the rack-plate, between the semi-circular plate, between rack-plate and the semi-circular plate, designed the welding technique that the rational spud leg of a cover is built, thereby guaranteed the efficiency of construction of spud leg main shipboard tube in the large-scale jack-up unit, when avoiding the weld seam shortcoming, guaranteed main shipboard tube security performance in use.
In order to address the above problem, the invention provides the construction welding method of main shipboard tube in a kind of spud leg, main shipboard tube comprises a plurality of linkage sections that are made of semi-circular plate and rack-plate.Wherein, rack-plate that is provided with in the middle of each linkage section comprises and the semi-circular plate that is positioned at the setting of rack-plate bilateral symmetry.Its welding method comprises the steps:
S1, both sides semi-circular plate and the rack-plate joint form with monolateral U-shaped groove is welded as a whole, and semi-circular plate is positioned at the middle part of rack-plate and short than rack-plate;
Joint form with the asymmetric X groove welds the rack-plate of S2, two linkage sections in the end;
S3, will fill up with semi-circular plate and fill up between the semi-circular plate of two linkage sections with the welding of the joint form of single bevel groove.
In the construction welding method of the invention described above main shipboard tube, the S1 step, at the weld of semi-circular plate and rack-plate, the root of semi-circular plate is provided with root face.The S3 step is filled up the weld with semi-circular plate and semi-circular plate, and the inner surface of the two is provided with permanent special-purpose homogeneity backing plate.Above-mentioned welding method adopts covered-electrode welding, and welding material adopts AWS A5.5 E11018-G type welding rod.After the welding, the welding point between the rack-plate, between the semi-circular plate, between rack-plate and the semi-circular plate, yield strength is greater than 690 MPas, and tensile strength is greater than 830 MPas, and-37 ℃ of following impact toughness are greater than 69 joules.
By technique scheme, it is as follows that the present invention has advantage: improved the accessibility of welding procedure, reduced the weld seam shortcoming; Reasonably the bevel for welding form has reduced the welding job amount, increases work efficiency; By the width of strictness control heat affected zone, make it can be not excessive, and remove the heat affected areas that cutting waits formation by mechanical means, can effectively reduce the negative effect of heat affected zone.The present invention selects rational welding conditions, suitable sweating heat input mode, rational welding bead arrangement for use, and suitable preheat temperature and strict control interlayer temperature remain between preheat temperature and 230 ℃ it, thereby improved the mechanical property of welding point, through welding procedure qualification test, the every index of the mechanical property of welding point all can satisfy the regulation of classification society rule.Therefore the welding procedure specification (WPS) of formulating according to the present invention can satisfy spud leg fully and build the construction needs.
Description of drawings
Fig. 1 is two sections perspective view under the spud leg main shipboard tube mated condition;
Fig. 2 is the mated condition structural representation of semi-circular plate in two sections main shipboard tubes among Fig. 1;
Fig. 3 is the schematic cross-section of spud leg main shipboard tube, demonstrates the bevel for welding between semi-circular plate and the rack-plate;
Fig. 4 is the schematic cross-section that docks between two sections rack-plates, demonstrates the butt joint groove of two sections tooth bars;
Fig. 5 is the schematic cross-section that docks between two sections semi-circular plates, demonstrates the divided edge structure of semi-circular plate butt joint in B place among Fig. 2;
Fig. 6 is the enlarged drawing at A place among Fig. 3;
Fig. 7 is the structural representation of semi-circular plate end among Fig. 6, demonstrates the structure of root face;
Fig. 8 is the structural representation of two sections rack-plate welding points;
Fig. 9 is the schematic cross-section of spud leg main shipboard tube.
The specific embodiment
The pile leg structure that the present invention relates to is mainly used in the self-elevating drilling platform of 400 feet depth of waters.The structure of its main shipboard tube comprises semi-circular plate 2 and rack-plate 1 as shown in Figure 9.With reference to shown in Figure 1, main shipboard tube is formed by connecting by a plurality of linkage sections, rack-plate 1 that is provided with in the middle of wherein each linkage section comprises and the semi-circular plate 2 that is positioned at the setting of rack-plate 1 bilateral symmetry.
With reference to Fig. 2-8, welding method of the present invention is described, comprise the steps:
A, both sides semi-circular plate 2 and the joint form of rack-plate 1 with monolateral U-shaped groove are welded as a whole, and semi-circular plate 2 is positioned at the middle part of rack-plate 1 and short than rack-plate 1; Wherein, at the weld of semi-circular plate 2 with rack-plate 1, the root of semi-circular plate 2 is provided with root face 11 (as shown in Figure 7).
Joint form with the asymmetric X groove welds the rack-plate 1 of b, two linkage sections in the end;
C, will fill up with semi-circular plate 2 ' and fill up between the semi-circular plate 2 of two linkage sections with the welding of the joint form of single bevel groove; Wherein, referring to Fig. 2 and Fig. 5, the weld between semi-circular plate 2 ' and the semi-circular plate 2 is provided with permanent special-purpose homogeneity backing plate 15 at the two inner surface; Its method to set up is, fills up with semi-circular plate 2 ' before in welding, backing plate 15 is provided with and is weldingly fixed on assigned address, after this welds semi-circular plate 2 '.Fig. 5 represents to dissect the opposite joining relation between two place's semi-circular plates 2 and 2 ' afterwards along semi-circular plate among Fig. 2 vertical (length direction).
The concrete above-mentioned steps of implementing, referring to shown in Figure 3, semi-circular plate 2 and rack-plate 1, with monolateral U-shaped groove type, referring to Fig. 7 middle finger lead-in wire indicate "
" part, its angle is preferably as among Fig. 3 28 °, semi-circular plate 2 and 6 millimeters of rack-plate 1 distances.Because semi-circular plate 2 roots are provided with root face 11, preferred as shown in Figure 3 36 ° of its inboard angle.Referring to Fig. 4, the butt joint between the rack-plate is the asymmetric X groove, among the preferred Fig. 4 of angle 5 ° and 30 °; Fig. 8 has shown another kind of butt joint X cut, and angle is 15 ° and 30 °, and demonstrates the corresponding relation of width T, 1/2 width T.Demonstrate 6 millimeters of the distance of butt joint between the semi-circular plate among Fig. 5, and single bevel groove, preferred 30 ° of its angle.
Above-mentioned welding method adopts covered-electrode welding; Welding material adopts AWS A5.5 E11018-G type welding rod.Simultaneously, in order to improve the mechanical property of welding point, satisfy between the rack-plate, the welding point between the semi-circular plate, between rack-plate and the semi-circular plate, make yield strength be not less than 690Mpa, tensile strength is not less than 830Mpa ,-37 ℃ of not requirements of Xiao Xu 69J of following impact toughness, process regulation: must be in welding process, the width of strict control heat affected zone guarantees that the heat affected zone is unsuitable excessive, and the part that is influenced by heat of formation such as cutting adopts mechanical means to remove; Rationally selecting welding conditions, suitable sweating heat input, reasonable Arrangement welding bead for use, adopting suitable preheat temperature and other measures to help down, strict control interlayer temperature remains between preheat temperature and 230 ℃ it.
The above; only be the preferable specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, all should be encompassed within protection scope of the present invention.
Claims (2)
1. the construction welding method of main shipboard tube in the spud leg, main shipboard tube comprises a plurality of linkage sections that are made of semi-circular plate (2) and rack-plate (1), described rack-plate (1) that is provided with in the middle of wherein each described linkage section comprises and the described semi-circular plate (2) that is positioned at the setting of described rack-plate (1) bilateral symmetry; It is characterized in that welding method comprises the steps:
(S1) described semi-circular plates in both sides (2) and the joint form of described rack-plate (1) with monolateral U-shaped groove are welded as a whole, and described semi-circular plate (2) is positioned at the middle part and more described rack-plate (1) weak point of described rack-plate (1); The angle outside of the monolateral U-shaped groove in both sides is 28 °, and the inboard is 36 °;
(S2) joint form with the asymmetric X groove welds the rack-plate of two linkage sections (1) in the end; The both sides angle of asymmetric X groove is respectively 5 ° and 30 °;
(S3) will fill up with semi-circular plate (2 ') and fill up between the semi-circular plate (2) of two linkage sections with the welding of the joint form of single bevel groove; The angle of V-butt is 30 °; In addition, the welding between semi-circular plate (2 ') and the semi-circular plate (2) is provided with permanent special-purpose homogeneity backing plate (15) at the two inner surface.
2. according to the construction welding method of main shipboard tube in the described spud leg of claim 1, it is characterized in that, in (S1) step, the weld of described semi-circular plate (2) and described rack-plate (1), the root of described semi-circular plate (2) is provided with root face (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710157687XA CN101225653B (en) | 2007-10-22 | 2007-10-22 | Construction welding method for main chord pipe inside platform legs |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710157687XA CN101225653B (en) | 2007-10-22 | 2007-10-22 | Construction welding method for main chord pipe inside platform legs |
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| CN101225653A CN101225653A (en) | 2008-07-23 |
| CN101225653B true CN101225653B (en) | 2010-07-07 |
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| CN200710157687XA Active CN101225653B (en) | 2007-10-22 | 2007-10-22 | Construction welding method for main chord pipe inside platform legs |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101576197B (en) * | 2009-06-01 | 2012-04-18 | 中国海洋石油总公司 | Semicircular plate used for oil drilling platform leg and manufacture process thereof |
| CN101987399B (en) * | 2009-08-06 | 2012-05-30 | 天津惠蓬船舶建造有限公司 | Method for welding pile leg main board pipe |
| 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 |
| CN105081526A (en) * | 2014-05-08 | 2015-11-25 | 上海振华重工(集团)股份有限公司 | Liner-free inside welding method and device for pile leg |
| CN104805815B (en) * | 2014-07-28 | 2016-10-19 | 烟台中集来福士海洋工程有限公司 | The tooth bar installation method of spud leg and tooth bar erecting device |
| CN104863106B (en) * | 2015-06-15 | 2016-05-18 | 上海外高桥造船有限公司 | A kind of self-elevating drilling platform spud leg |
| 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 |
| CN105234575B (en) * | 2015-11-18 | 2017-05-17 | 青岛海西重机有限责任公司 | Manufacturing method for self-elevating type offshore platform cylindrical pile leg |
| 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 |
| CN114749765B (en) * | 2022-04-28 | 2024-02-23 | 鞍钢股份有限公司 | Efficient automatic welding process for racks and semi-chord tubes |
| CN115139022B (en) * | 2022-08-29 | 2022-11-15 | 南通泰胜蓝岛海洋工程有限公司 | Welding process for rack plate and semicircular plate of pile leg of drilling platform |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0645496A1 (en) * | 1993-09-28 | 1995-03-29 | Technip Geoproduction | Process and device for assembling the flanges of the supporting-legs of an oil-platform |
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2007
- 2007-10-22 CN CN200710157687XA patent/CN101225653B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0645496A1 (en) * | 1993-09-28 | 1995-03-29 | Technip Geoproduction | Process and device for assembling the flanges of the supporting-legs of an oil-platform |
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| CN101225653A (en) | 2008-07-23 |
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