阅读说明：本技术 一种桩腿齿条安装方法 (Pile leg rack installation method ) 是由 杜仕忠 宋玉甫 董晶晶 施海滨 晁世方 刘国军 陈新华 王秋松 姜东凯 姜铭 李 于 2020-12-08 设计创作，主要内容包括：本发明公开了一种桩腿齿条安装方法,它涉及海洋平台桩腿焊接技术领域,包括以下步骤：桩腿齿条安装划线；旋转工装安装：将旋转工装安装在滚轮架上,通过旋转工装的旋转,将齿条安装于桩腿上,齿条安装时,为避让齿条拼缝在同一截面,各分段齿条呈螺旋形布置,桩腿圆周方向的四个齿条的顶部分段分别具有不同齿数,四个齿条的其余分段的齿数相同；对齿条进行焊接：焊接时,由桩腿顶部从上至下按批进行,齿条与桩腿筒体的连接焊缝采用分层跳焊,各层的接头相互错开。本发明的优点在于：齿条的安装牢度高,确保齿条焊接质量；通过旋转工装带动桩腿旋转,施工时可以有更好的施工工位,保证焊接质量,减少焊接缺陷,改善焊缝质量；较好控制齿条安装精度。(The invention discloses a pile leg rack installation method, which relates to the technical field of pile leg welding of an ocean platform and comprises the following steps: installing and marking a rack of the pile leg; installing a rotary tool: installing a rotary tool on a roller frame, installing racks on the pile leg through the rotation of the rotary tool, wherein when the racks are installed, in order to avoid the splicing of the racks on the same section, each segmented rack is spirally arranged, the top segments of four racks in the circumferential direction of the pile leg are respectively provided with different tooth numbers, and the tooth numbers of the rest segments of the four racks are the same; welding the rack: during welding, the top of the pile leg is welded from top to bottom, the connecting welding seam between the rack and the pile leg cylinder is subjected to layered skip welding, and the joints of all layers are staggered. The invention has the advantages that: the mounting fastness of the rack is high, and the welding quality of the rack is ensured; the pile leg is driven to rotate through the rotating tool, so that a better construction station can be provided during construction, the welding quality is ensured, the welding defects are reduced, and the quality of a welding seam is improved; the rack installation accuracy is well controlled.)

1. A pile leg rack installation method is characterized in that: the method comprises the following steps:

s1, installing and scribing a pile leg rack:

s1.1, marking in the length direction of a pile leg rack: marking out a center line of the first tooth of the rack according to the lowest point of the top end plane of the pile leg, taking the center line of the first tooth as a reference, deviating 500-505mm downwards, and marking out a check line as a subsequent check reference;

s1.2, marking off the circumference direction of the pile leg: marking lines on quartering racks in the circumferential direction of the pile leg, and connecting the lines to determine four rack mounting lines according to the quartering lines at two ends of the pile leg;

s2, mounting a rotary tool: arranging a roller frame, installing a rotating tool on the roller frame, making anti-tilting supports on two sides of the rotating tool, installing racks on the pile leg through rotation of the rotating tool, wherein when the racks are installed, in order to avoid that the racks are spliced on the same cross section, each segmented rack is spirally arranged, top subsections of four racks in the circumferential direction of the pile leg respectively have different tooth numbers, and the tooth numbers of the rest subsections of the four racks are the same;

s3, welding the rack:

s3.1, removing impurities at the welding position of the rack and the nearby area before welding, measuring the levelness of the rack before welding and the gap between the clamping plate and the barrel, preheating the welding position, measuring the levelness of the rack after preheating, and welding after the temperature is measured to be qualified;

s3.2, during welding, the top of the pile leg is welded from top to bottom in batches, firstly, a rotating tool is rotated, four racks are arranged into two racks which are arranged in parallel at the upper part and two racks which are arranged in parallel at the lower part, the two racks at the lower part are transversely welded, the two racks at the upper part are horizontally welded, the connecting welding seams of the racks and a pile leg cylinder body adopt layer jump welding, the joints of all layers are staggered, the layer sections are firstly and simultaneously welded to the filling amount of a welding seam 1/3, then, the pile leg is rotated by 180 degrees through the rotating tool, the welded sections are continuously welded to the filling amount of the welding seam 2/3, then, the pile leg is rotated by 180 degrees twice through the rotating tool, the welded sections are continuously welded to the completion after each rotation, the adjacent layer sections are welded in the same mode after the welding is completed, cleaning work is carried out after each welding, the welding work is continuously carried out, the welding is symmetrical welding, controlling the interlayer temperature in the welding process;

and S3.3, carrying out heat treatment on the welding seam and the nearby area after welding, wrapping and slowly cooling by using a silica-alumina fiber blanket, and cooling for 72 hours after welding to carry out flaw detection.

2. The method of claim 1, further comprising: in the step S1.1, after the marking in the length direction of the pile leg rack is finished, knocking out a sample punching hole and marking; in the step S1.2, the pile leg rack installation line and the pile leg cylinder longitudinal seam alternately exist, and the included angle between the rack installation line and the cylinder center connecting line and the included angle between the cylinder longitudinal seam and the cylinder center connecting line are 20-21 degrees.

3. The method of claim 1, further comprising: in step S2, the top segments of the four racks in the circumferential direction of the leg have sequentially increasing numbers of teeth, which are 9, 10, 11, and 12 teeth, respectively, and the numbers of teeth of the remaining segments of the four racks are the same and are 22 teeth.

4. The method of claim 1, further comprising: in the step S3.1, measuring in a time period with small temperature change by using a measuring instrument with an error range less than or equal to 0.5 mm; in the step S3.2, in the process of spin welding, rack levelness measurement is carried out after spin welding is finished every time, and rack perpendicularity is measured after welding is finished.

5. The method of claim 1, further comprising: the rotary tool comprises a first arc-shaped structure and a second arc-shaped structure, the first arc-shaped structure and the second arc-shaped structure are both semi-annular structures, the first arc-shaped structure and the second arc-shaped structure are combined to form an annular structure, and the end parts of the first arc-shaped structure and the second arc-shaped structure are locked through a rigging turnbuckle;

the first arc-shaped structure and the second arc-shaped structure are both provided with an outer supporting structure and an inner pressing structure, the outer supporting structure is arc-shaped, the outer supporting structures of the first arc-shaped structure and the second arc-shaped structure are combined into a ring, and the outer supporting structure is arranged on the roller carrier;

the inner compression structure is arranged on the inner side of the outer support structure and is formed by a plurality of compression plates in an annular array, and the compression plates are in a trapezoidal boss structure.

6. The leg rack installation method of claim 5, wherein: the pile leg clamping device is characterized in that a clamping plate is additionally arranged between a pressing plate of the inner pressing structure and a cylinder of the pile leg, the clamping plate is arc-shaped, and the radian of the clamping plate is consistent with that of the cylinder of the pile leg.

7. The leg rack installation method of claim 5, wherein: and a jack is arranged in the compression plate.

Technical Field

The invention relates to the technical field of welding of pile legs of ocean platforms, in particular to a method for installing a rack of a pile leg.

Background

The pile leg structure form of the self-elevating ocean platform is divided into a truss type pile leg and a cylindrical pile leg. The cylindrical pile leg is made into a closed cylindrical structure by using a steel plate, and then a rack is welded on the axial outer wall of the cylinder according to the required amount.

The welding difficulty of the rack is high during construction of the pile leg with the rack, because the rack is a heavy plate and is a high-strength material, the welding area of the pile leg rack and the cylinder body needs to be preheated to a certain temperature before welding, and heat is preserved for a long time after welding. For the rack cylinder welding type pile leg, the pile leg is firstly rolled into a circle by a plurality of sections of cylinder sections, the pile leg is centered and then butted together by a roller frame after being rolled, the pile leg is supported by a portal frame at multiple points, the pile leg is fixedly supported on the ground, the rack is pulled into an installation position after being hoisted in sections, the rack is welded, after a module vehicle is moved and transported, the rack is hoisted on a ship by a floating crane, and the installation precision of the rack is difficult to control.

In addition, the post-welding internal stress of the pile leg structure is large, and the internal stress is redistributed in the subsequent pile leg sectional hoisting and transferring process and is easy to deform, so that the welding process has high requirements, welded base materials are heavy plates and high-strength plates, heating and post-welding heat preservation are needed during welding, the temperature after heating reaches 150-200 ℃, and the heat preservation temperature is over 100 ℃, so that the construction is very difficult; under the condition of not turning over the pile, welding can be carried out only through overhead welding, the welding difficulty is high, and the welding quality is difficult to guarantee; if the pile needs to be turned, the rack can influence the rotation of the roller frame when the pile is turned, the welding deformation of the rack is large, and the control is difficult. The traditional pile leg rack has the defects that the length is too long, the requirements on straightness, lateral bending and torsion are difficult to control, the service life of the final pile leg is greatly shortened, and the manufacturing cost of the pile leg is very high. Therefore, it is desirable to provide a method for installing a leg rack, so as to more conveniently weld the leg rack, reduce the welding difficulty, prevent the rack from being welded and deformed, improve the weld quality, and better control the rack installation accuracy.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a pile leg rack mounting method, which can solve the problems of high welding difficulty of a pile leg rack, large welding deformation of the rack, difficulty in control, poor welding seam quality, poor rack mounting precision and the like.

In order to solve the technical problems, the technical scheme of the invention is as follows: the method comprises the following steps:

s1, installing and scribing a pile leg rack:

s1.1, marking in the length direction of a pile leg rack: marking out a center line of the first tooth of the rack according to the lowest point of the top end plane of the pile leg, taking the center line of the first tooth as a reference, deviating 500-505mm downwards, and marking out a check line as a subsequent check reference;

s1.2, marking off the circumference direction of the pile leg: marking lines on quartering racks in the circumferential direction of the pile leg, and connecting the lines to determine four rack mounting lines according to the quartering lines at two ends of the pile leg;

s2, mounting a rotary tool: arranging a roller frame, installing a rotating tool on the roller frame, making anti-tilting supports on two sides of the rotating tool, installing racks on the pile leg through rotation of the rotating tool, wherein when the racks are installed, in order to avoid that the racks are spliced on the same cross section, each segmented rack is spirally arranged, top subsections of four racks in the circumferential direction of the pile leg respectively have different tooth numbers, and the tooth numbers of the rest subsections of the four racks are the same;

s3, welding the rack:

s3.1, removing impurities at the welding position of the rack and the nearby area before welding, measuring the levelness of the rack before welding and the gap between the clamping plate and the barrel, preheating the welding position, measuring the levelness of the rack after preheating, and welding after the temperature is measured to be qualified;

s3.2, during welding, the top of the pile leg is welded from top to bottom in batches, firstly, a rotating tool is rotated, four racks are arranged into two racks which are arranged in parallel at the upper part and two racks which are arranged in parallel at the lower part, the two racks at the lower part are transversely welded, the two racks at the upper part are horizontally welded, the connecting welding seams of the racks and a pile leg cylinder body adopt layer jump welding, the joints of all layers are staggered, the layer sections are firstly and simultaneously welded to the filling amount of a welding seam 1/3, then, the pile leg is rotated by 180 degrees through the rotating tool, the welded sections are continuously welded to the filling amount of the welding seam 2/3, then, the pile leg is rotated by 180 degrees twice through the rotating tool, the welded sections are continuously welded to the completion after each rotation, the adjacent layer sections are welded in the same mode after the welding is completed, cleaning work is carried out after each welding, the welding work is continuously carried out, the welding is symmetrical welding, controlling the interlayer temperature in the welding process;

and S3.3, carrying out heat treatment on the welding seam and the nearby area after welding, wrapping and slowly cooling by using a silica-alumina fiber blanket, and cooling for 72 hours after welding to carry out flaw detection.

Further, in the step S1.1, after the marking in the length direction of the leg rack is completed, knocking out a sample punching hole, and marking; in the step S1.2, the pile leg rack installation line and the pile leg cylinder longitudinal seam alternately exist, and the included angle between the rack installation line and the cylinder center connecting line and the included angle between the cylinder longitudinal seam and the cylinder center connecting line are 20-21 degrees.

Further, in step S2, the top segments of the four racks in the circumferential direction of the leg have sequentially increasing numbers of teeth, which are 9, 10, 11 and 12 teeth, respectively, and the remaining segments of the four racks have the same number of teeth, which is 22 teeth.

Further, in the step S3.1, in a time period when the temperature change is small, a measuring instrument with an error range of less than or equal to 0.5mm is selected; in the step S3.2, in the process of spin welding, rack levelness measurement is carried out after spin welding is finished every time, and rack perpendicularity is measured after welding is finished.

Further, the rotating tool comprises a first arc-shaped structure and a second arc-shaped structure, the first arc-shaped structure and the second arc-shaped structure are both semi-annular structures, the first arc-shaped structure and the second arc-shaped structure are combined to form an annular structure, and the end parts of the first arc-shaped structure and the second arc-shaped structure are locked through a rigging turnbuckle;

the first arc-shaped structure and the second arc-shaped structure are both provided with an outer supporting structure and an inner pressing structure, the outer supporting structure is arc-shaped, the outer supporting structures of the first arc-shaped structure and the second arc-shaped structure are combined into a ring, and the outer supporting structure is arranged on the roller carrier;

the inner compression structure is arranged on the inner side of the outer support structure and is formed by a plurality of compression plates in an annular array, and the compression plates are in a trapezoidal boss structure.

Furthermore, a clamping plate is additionally arranged between the pressing plate of the inner pressing structure and the cylinder body of the pile leg, the clamping plate is arc-shaped, and the radian of the clamping plate is consistent with that of the cylinder body of the pile leg.

Further, a jack is arranged in the compression plate.

The invention has the advantages that: when the racks are installed, the sectional racks are spirally arranged, the racks can be avoided from being spliced on the same section, and the pile leg rack installation line and the pile leg barrel longitudinal joint alternately exist, so that the installation fastness of the racks is improved, and the welding quality of the racks is ensured;

the pile leg is driven to rotate through the rotating tool, a better construction station can be provided during construction, the flat welding position can be ensured, the flat welding construction quality is generally superior to that of overhead welding, the welding quality is ensured, the welding defect is reduced, the rotating tool and the pile leg are relatively fixed, the deformation of the pile leg caused by stress concentration of a welding rack is reduced, and the welding seam quality is improved;

the measurement is carried out before and after welding, during welding, the connecting welding line of the rack and the pile leg cylinder body adopts layered skip welding, the joints of all layers are staggered, the welding is firstly carried out until the filling amount of the welding line 1/3 is obtained, then the welding is carried out until the filling amount of the welding line 2/3 is obtained, and finally the welding is carried out until the welding is finished, the welding work is continuously carried out, and the installation precision of the rack can be well controlled;

the rack is high in installation precision, the service life of the pile leg can be prolonged, the cost is greatly saved, and the development of offshore wind power business and renewable energy is facilitated.

Drawings

FIG. 1 is a longitudinal cross-sectional view of a rack of the present invention;

FIG. 2 is a schematic view of the rack mounting location of the present invention;

FIG. 3 is a schematic structural view of a rotary tool of the present invention;

FIG. 4 is a schematic structural view of the rotary tool of the present invention used in conjunction with a roller frame;

FIG. 5 is a schematic view of a leg rotation and rack installation step;

FIG. 6 is a schematic view of a layered stitch bond of the present invention;

fig. 7 is a sequence diagram of rack welding according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and the detailed description. The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.

The specific implementation mode adopts the following technical scheme: the method comprises the following steps:

s1, installing and scribing a pile leg rack:

s1.1, marking in the length direction of a pile leg rack: as shown in fig. 1, marking out a center line of the head tooth of the rack according to the lowest point of the top end plane of the leg, taking the center line of the head tooth as a reference, deviating 500-;

s1.2, marking off the circumference direction of the pile leg: the method comprises the following steps of marking out racks in a quartering mode in the circumferential direction of a pile leg, connecting lines to determine four rack installation lines according to quartering lines at two ends of the pile leg, wherein the rack installation lines of the pile leg and longitudinal joints of a cylinder body of the pile leg alternately exist, included angles between the rack installation lines and the connecting line of the center of the cylinder body and between the longitudinal joints of the cylinder body and the connecting line of the center of the cylinder body are 20 degrees, and the longitudinal joints of the cylinder body of the pile leg face towards the inner.

S2, mounting a rotary tool: arrange the gyro wheel frame, install rotatory frock on the gyro wheel frame, the both sides of rotatory frock are makeed and are prevented inclining and support, through the rotation of rotatory frock, install the rack on the spud leg, during the rack installation, for dodging the rack piece joint in same cross-section, each segmentation rack is the spiral and arranges, the top subsection of four racks of spud leg circumferencial direction has the number of teeth that increases in proper order respectively, be 9 teeth respectively, 10 teeth, 11 teeth and 12 teeth, the number of teeth of all the other subsections of four racks is the same, be 22 teeth, improve the installation fastness of rack, ensure rack welding quality.

As shown in fig. 3 and 4, the rotary tool comprises a first arc-shaped structure 1 and a second arc-shaped structure 2, the first arc-shaped structure 1 and the second arc-shaped structure 2 are both semi-annular structures, the first arc-shaped structure 1 and the second arc-shaped structure 2 are combined to form an annular structure, the ends of the first arc-shaped structure 1 and the second arc-shaped structure 2 are locked by a rigging turnbuckle 5, the rigging turnbuckle 5 is mature in the prior art, the specific structure and principle are not explained, the combined whole is annular, the rotary tool can be used in cooperation with a roller frame 6 to turn over a spud leg 7 so as to weld a rack conveniently, a cylinder 71 of the spud leg 7 is arranged inside the annular formed by the two arc-shaped structures, the rotary tool can drive the spud leg to rotate, a better construction station can be provided during construction, the risk of burning of workers can be reduced, the flat welding position can be ensured, the flat welding construction quality is generally superior to overhead, and welding defects are reduced.

The first arc-shaped structure 1 and the second arc-shaped structure 2 are both provided with an outer supporting structure 3 and an inner pressing structure 4, the outer supporting structure 3 is arc-shaped, the outer supporting structures 3 of the first arc-shaped structure 1 and the second arc-shaped structure 2 are combined into a ring, and the outer supporting structure 3 is arranged on the roller carrier 6.

Interior compact structure 4 locates outer bearing structure 3 inboardly, interior compact structure 4 is annular array by several pressure strip 41 and constitutes, pressure strip 41 is trapezoidal boss structure, interior compact structure 4 supports spud leg 7 and spud leg 7's barrel 71, need fill up between rotatory frock and the spud leg 7, use boss structure to reduce area of contact, the work of filling up is implemented more easily, it is equipped with the cardboard to add between pressure strip 41 of interior compact structure 4 and the barrel 71 of spud leg 7, the cardboard is convex, the circularity of cardboard is unanimous with spud leg 7's barrel 71, the cardboard can be limited in inside the annular of two interior compact structure 4 constitutions with spud leg 7, spud leg 7 and interior compact structure 4 position relatively fixed, rotatory frock and spud leg 7 relatively fixed, reduce spud leg 7 because of the deformation that the stress concentration of welding rack arouses. A jack can be arranged in the pressing plate 41, the jack can slightly jack up the clamping plate, and the placing position of the pile leg 7 can be finely adjusted, so that the center of the pile leg 7 is consistent with the center of the rotary tool.

When the pile leg fixing device is used, the first arc-shaped structure 1 is firstly placed on the roller frame 6, the position of the pile leg 1 can be finely adjusted through the jack, then the pile leg 7 and the barrel 71 are hung in the pile leg fixing device, the rack is installed on the barrel 71, after the pile leg fixing device is completed, the second arc-shaped structure 2 is installed, the first arc-shaped structure 1 and the second arc-shaped structure 2 are attached, the first arc-shaped structure 1 and the second arc-shaped structure 2 are locked through the rigging turnbuckle 5, then the roller frame 6 drives the pile leg 7 to rotate 180 degrees, after the rack is installed, when the rotating tooling drives the pile leg 7 to rotate, the rack cannot affect overturning, then the rigging turnbuckle 5 is opened, the tooling is disassembled, other racks are installed, the rack installation is more convenient through the rotating tooling, horizontal traction is not needed, direct hoisting can be completed, the.

S3, welding the rack:

s3.1, removing impurities at the welding position of the rack and the nearby area before welding, measuring the levelness of the rack before welding and the gap between the clamping plate and the barrel, preheating the welding position, measuring the levelness of the rack after preheating, welding after the temperature measurement is qualified, and selecting a measuring instrument with an error range less than or equal to 0.5mm when the measurement is carried out in a time period with small temperature change;

s3.2, during welding, the top of the pile leg is welded from top to bottom in batches, firstly, a rotating tool is rotated, four racks are arranged into two racks which are arranged in parallel at the upper part and two racks which are arranged in parallel at the lower part, the two racks at the lower part are transversely welded, the two racks at the upper part are horizontally welded, the connecting welding seams of the racks and a pile leg cylinder body adopt layer jump welding, the joints of all layers are staggered, the layer sections are firstly and simultaneously welded to the filling amount of a welding seam 1/3, then, the pile leg is rotated by 180 degrees through the rotating tool, the welded sections are continuously welded to the filling amount of the welding seam 2/3, then, the pile leg is rotated by 180 degrees twice through the rotating tool, the welded sections are continuously welded to the completion after each rotation, the adjacent layer sections are welded in the same mode after the welding is completed, cleaning work is carried out after each welding, the welding work is continuously carried out, the welding is symmetrical welding, the temperature between control layer in the welding process, all welding seams arc-receiving upper strata must be shorter than the lower floor, arc-receiving position must polish smooth, in the spin welding process, all carry out rack levelness after the spin welding is accomplished at every turn and measure, measure the rack straightness that hangs down after the welding is accomplished, measure before the welding back, can better control rack installation accuracy.

As shown in fig. 6 and 7, if the continuous rack segment is segment 1, segment 2, segment 3 and segment 4, the welding mode is: 1) 1# and 2# flat welding and 3# and 4# transverse welding positions, and the segments 1 and 3 are simultaneously welded to the filling amount of a welding seam 1/3 (eight pairs of welding are symmetrically welded);

2) 3# and 4# horizontal welding and 1# and 2# horizontal welding positions, and the segments 1 and 3 are simultaneously welded to the filling amount of a welding seam 2/3 (eight welding positions are symmetrically welded in pairs);

3) 1# and 2# flat welding and 3# and 4# transverse welding positions, and simultaneously welding the sections 1 and 3 to finish (eight pairwise symmetrical welding);

4) 3# and 4# horizontal welding and 1# and 2# horizontal welding positions, and welding the sections 1 and 3 at the same time till completion (eight pairwise symmetrical welding);

5) 1# and 2# flat welding and 3# and 4# transverse welding positions, and the sections 2 and 4 are simultaneously welded to the filling amount of a welding seam 1/3 (eight pairwise symmetric welding);

6) 3# and 4# horizontal welding and 1# and 2# horizontal welding positions, and the sections 2 and 4 are simultaneously welded to the filling amount of a welding seam 2/3 (eight welding positions are symmetrically welded in pairs);

7) 1# and 2# flat welding and 3# and 4# transverse welding positions, and simultaneously welding the sections 2 and 4 to be finished (eight pairwise symmetrical welding);

8) 3# and 4# horizontal welding positions and 1# and 2# horizontal welding positions, and the sections 2 and 4 are welded to be finished simultaneously (eight pairs of symmetrical welding positions).

And S3.3, carrying out heat treatment on the welding seam and the nearby area after welding, wrapping and slowly cooling by using a silica-alumina fiber blanket, and cooling for 72 hours after welding to carry out flaw detection.

The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.