High-precision installation method for fair lead of cylindrical floating production device

Abstract

The invention discloses a high-precision installation method for a fair lead of a cylindrical floating production device, and the method comprises the following steps: S1, prefabricating a fair lead segment, and enabling the precision of the parallelism and the spacing value between horizontal support plates of the same group of fair leads on the fair lead segment to meet + / -2mm; s2, a reference datum of the theoretical installation position of the fair lead is arranged on the fair lead section, meanwhile, the reference datum of the theoretical installation position of the fair lead is arranged on a whole ship carrying site, and the fair lead section is carried in place according to the references; s3, prefabricating chain pipe sections; s4, according to the reference datum in the S2, carrying the hawse pipe sections to the ship body; s5, re-fitting a mounting reference point of the fair lead on the ship body by taking the center of the hawse pipe as a reference; and S6, according to the installation reference point in the S5, the fair lead is welded to the ship body. The high-precision mounting method for the fair lead of the cylindrical floating production device is high in mounting precision and efficiency, and the cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of marine engineering, and in particular relates to a high-precision installation method of a cylindrical floating production device fairlead. Background Art

[0002] The fairlead is a key component of the floating production mooring system. The height difference between the fairlead and the anchor chain pipe is more than 20 meters. After installation, the relative position deviation between the fairlead and the corresponding anchor chain pipe is required to be within 5mm, and the position error between two adjacent fairleads is required to be within 3mm. In the prior art, the conventional installation method is to first install the main deck anchor chain pipe in sections, and then install the fairlead based on the accuracy of the anchor chain pipe. This method can ensure the relative accuracy of the fairlead and the anchor chain pipe, but the position accuracy between adjacent fairleads is difficult to control, resulting in poor installation accuracy of the fairlead, requiring multiple repairs, reducing work efficiency and increasing construction costs.

[0003] Therefore, it is urgent to design a high-precision installation method for a cylindrical floating production device fairlead to solve the problems of poor installation accuracy, low working efficiency and high construction cost of the fairlead in the prior art mentioned above. Summary of the invention

[0004] In order to solve the technical problems of poor installation accuracy, low working efficiency and high construction cost of the prior art fairlead mentioned in the background technology, a high-precision installation method of a cylindrical floating production device fairlead is provided to solve the above problems.

[0005] To achieve the above-mentioned purpose, the specific technical scheme of the method for high-precision installation of a cylindrical floating production device fairlead of the present invention is as follows: A high-precision installation method for a cylindrical floating production device fairlead comprises the following steps: S1. Prefabricated fairlead sections. The parallelism and spacing accuracy between the horizontal bracket plates of the same group of fairleads on the fairlead sections shall meet ±2mm; S2. Set a reference datum for the theoretical installation position of the fairlead on the fairlead section, and set a reference datum for the theoretical installation position of the fairlead at the whole ship loading site, and load the fairlead section into place according to the reference datum; S3, prefabricated anchor chain pipe sections; S4. According to the reference datum in S2, the anchor chain pipe is mounted on the hull in sections; S5. Re-fit the installation reference point of the fairlead on the hull with the center of the hawse pipe as the reference; S6. Weld the fairlead to the hull according to the installation reference point in S5.

[0006] Furthermore, when prefabricating the fairlead in sections, a cutting margin of 100 mm is reserved on the horizontal bracket plate of the fairlead, and the installation reference point of the fairlead is measured and marked in the area where the fairlead is installed in the fairlead section.

[0007] Furthermore, the theoretical radial angle line of each fairlead and the theoretical projection point on the angle line are drawn in the ship assembly area as reference datum for installing the fairlead sections. At the same time, based on this, the theoretical projection point of the center of each anchor chain pipe is drawn as a reference datum for installing the anchor chain pipe sections.

[0008] Furthermore, before the anchor chain pipe sections are installed on the hull, the alignment deviation between the anchor chain pipe and the theoretical projection point of the center of the anchor chain pipe is within ±2 mm.

[0009] Furthermore, a method of refitting the installation reference point of the fairlead on the hull based on the center of the anchor chain pipe is to make a permanent mark on the projection point of the center of the anchor chain pipe on the ground, and refit the projection point of the central axis of the fairlead shaft in combination with the angle line as the actual reference point for the installation of the fairlead.

[0010] Furthermore, the cutting amount of the horizontal bracket plate is calculated according to the projection point of the central axis of the fairlead shaft, a welding compensation amount of 3-5 mm is reserved, the excess cutting line of the horizontal bracket plate is drawn, and the excess is cut off.

[0011] Furthermore, when the fairlead is welded to the hull, it is first spot welded to the hull, and a total station is used to measure the position deviation between the projection point of the central axis of the fairlead shaft and the reference point of the anchor chain pipe, the parallelism of the upper support and the lower support, the spacing deviation and the verticality of the shaft. After all of them are qualified, the fairlead is welded to the hull.

[0012] Furthermore, when the upper and lower supports of the fairlead are welded to the hull, the horizontal support plate of the support is welded first, and then the vertical support plate is welded. The vertical support plate must be welded symmetrically on both sides, and the horizontal support plate is welded simultaneously from the middle to both sides, and the upper and lower supports are welded symmetrically.

[0013] Further, the area where the three groups of fairleads are rooted is divided into three independent fairlead sections, and the area where the three groups of anchor chain pipes are rooted is divided into three independent anchor chain pipe sections. The anchor chain pipe sections are located directly above the fairlead sections and are arranged in one-to-one correspondence.

[0014] Furthermore, four fairleads are evenly spaced apart on each fairlead segment, four anchor chain pipes are evenly spaced apart on each anchor chain pipe segment, and the fairleads and anchor chain pipes are arranged in one-to-one correspondence.

[0015] The high-precision installation method of the cylindrical floating production device fairlead of the present invention has the following advantages: By prefabricating fairlead segments, the accuracy of parallelism and spacing values ​​between horizontal bracket plates of the same group of fairleads on the fairlead segments meets ±2mm; a reference datum for the theoretical installation position of the fairlead is set on the fairlead segment, and a reference datum for the theoretical installation position of the fairlead is set at the whole ship loading site at the same time, and the fairlead segments are loaded in place according to the above datums; prefabricating anchor chain pipe segments; according to the reference datum, loading the anchor chain pipe segments onto the hull; refitting the installation datum point of the fairlead on the hull with the center of the anchor chain pipe as the datum; welding the fairlead to the hull according to the installation datum point, which not only realizes the precise installation between the fairlead and the anchor chain pipe, but also realizes the installation between adjacent fairleads, with high installation accuracy, improved work efficiency and reduced construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the segmented fairlead of the present invention; Figure 2 It is a schematic structural diagram of the reference point of the fairlead on the ground after the fairlead of the present invention is closed in sections; Figure 3 It is a schematic diagram of the structure of prefabricating anchor chain pipe segments in a workshop according to the present invention; Figure 4 It is a schematic diagram of the structure of the anchor chain pipe of the present invention being mounted and closed on the hull in sections; Figure 5 It is a structural schematic diagram of the projection point of the anchor chain pipe after installation is completed on the ground according to the present invention; Figure 6 It is a structural schematic diagram of the present invention for re-fitting the installation reference points of the fairlead on the hull in sections according to the installed anchor chain pipe; Figure 7 This is a schematic diagram of the structure of the cutting margin of the horizontal support plate of the present invention; Figure 8 This is a schematic diagram of the structure of the fairlead of the present invention installed on the hull; Fig. 9 It is a structural schematic diagram of the welding of the fairlead of the present invention.

[0017] Description of the markings in the figure: 1. Hull; 11. Hull center; 12. Projection point of the central axis of the fairlead shaft; 13. Angle line; 2. Fairlead sections; 3. Fairlead; 31. Fairlead shaft; 311. Cutting allowance; 32. Vertical bracket plate; 321. Upper vertical bracket plate; 322. Lower vertical bracket plate; 33. Upper support; 34. Lower support; 35. Fairlead installation reference point; 4. Anchor chain pipe sections; 41. Anchor chain pipe; 42. Theoretical projection point of the center of the anchor chain pipe; 43. Theoretical projection point of the anchor chain pipe; 44. Permanent marking point; 5. Total station. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0019] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0020] Please refer to the attached Figure 1 To Attachment Fig. 9 The invention describes a method for highly accurate installation of a cylindrical floating production device fairlead.

[0021] The fairlead 3 of the cylindrical floating production unit is rooted at the bottom of the hull 1, and the anchor chain pipe 41 below the anchor windlass is at the top of the hull 1. In order to ensure the reliability and life of the entire mooring system, the relative position deviation between the center axis of the upper anchor chain pipe 41 and the center axis of the fairlead shaft 31 is generally controlled within ±5mm.

[0022] like Figures 1 to 8 As shown, the high-precision installation method of the cylindrical floating production device fairlead in the present invention comprises the following steps: S1, prefabricated fairlead segment 2, the parallelism and spacing accuracy between the horizontal bracket plates of the same group of fairleads 3 on the fairlead segment 2 meets ±2mm; When prefabricating the fairlead segment 2, a 100 mm cutting margin 311 is reserved on the horizontal support plate of the fairlead 3 to adjust the precise installation position of the fairlead 3. The fairlead installation reference point 35 is measured and marked in the area where the fairlead 3 is installed on the fairlead segment 2, and the fairlead installation reference point 35 represents the theoretical installation position of each fairlead 3 on the segment.

[0023] S2. Setting a reference datum of the theoretical installation position of the fairlead 3 on the fairlead segment 2 and setting a reference datum of the theoretical installation position of the fairlead 3 at the whole ship loading site, and loading the fairlead segment 2 into place according to the reference datum; In the ship assembly and loading area, draw the theoretical radial angle line 13 between each fairlead 3 and the hull center 11 and the theoretical projection point of each fairlead 3 on the angle line 13 as a reference for installing the fairlead segment 2. At the same time, based on this, draw the theoretical projection point of the center of each anchor chain pipe as a reference for installing the anchor chain pipe segment 4.

[0024] S3, prefabricated anchor chain pipe segment 4; In the workshop, the anchor chain pipe segments 4 are prefabricated. During construction, the theoretical projection points 42 of the center of each anchor chain pipe in the anchor chain pipe segments 4 should be marked on the floor of the workshop first, and used as reference points to position the anchor chain pipe 41. The verticality of the anchor chain pipe 41 and the relative position deviation of the anchor chain pipe 41 are key size control points.

[0025] S4, according to the reference datum in S2, carrying the anchor chain pipe segment 4 onto the hull 1; Specifically, the anchor chain pipe theoretical projection point 43 is marked on the ground as the installation reference point of the anchor chain pipe segment 4, and then the anchor chain pipe segment 4 is carried and closed to the top of the hull 1 according to the above reference reference. Before welding the anchor chain pipe segment 4, it should be ensured that the alignment deviation between the anchor chain pipe 41 and the anchor chain pipe center theoretical projection point 42 is within ±2mm.

[0026] S5, refitting the installation reference point of the fairlead 3 on the hull 1 with the center of the hawse pipe 41 as the reference; After all the welding work of the hull 1 below the height of the anchor chain pipe section 4 is completed, the installation accuracy of the anchor chain pipe 41 is remeasured, and the installation reference point of the fairlead 3 on the hull 1 is refitted with the center of the anchor chain pipe 41 as the reference. The projection point of the center of the anchor chain pipe 41 on the ground is permanently marked as a permanent marking point 44, and the projection point 12 of the center axis of the fairlead shaft is refitted in combination with the angle line 13 as the actual reference point for the installation of the fairlead 3.

[0027] The cutting amount of the horizontal bracket plate 31 is calculated according to the projection point 12 of the central axis of the fairlead shaft, a welding compensation amount of 3-5 mm is reserved, the excess cutting line of the horizontal bracket plate 31 is drawn, and the excess is cut off.

[0028] S6. Weld the fairlead 3 to the hull 1 according to the installation reference point in S5.

[0029] When the fairlead is welded to the hull 1, the fairlead 3 is first spot welded to the hull 1, and the total station 5 is used to measure the position deviation between the projection point 12 of the fairlead shaft axis and the reference point of the anchor chain pipe 41, the parallelism of the upper support 33 and the lower support 34, the spacing deviation and the verticality of the shaft. After all of them are qualified, the fairlead 3 is welded to the hull 1.

[0030] Further, if Figure 1 and Fig. 9 As shown, when the upper support 33 and the lower support 34 of the fairlead 3 are welded to the hull 1, the horizontal support plate of the support is welded first, and then the vertical support plate 32 is welded. The vertical support plate 32 needs to ensure symmetrical welding on both sides. The vertical support plate 32 includes an upper vertical support plate 321 and a lower vertical support plate 322. The upper vertical support plate 321 is welded first, and then the upper vertical support plate 322. The horizontal support plates are welded simultaneously from the middle to both sides, and the upper support 33 and the lower support 34 are welded symmetrically.

[0031] Further, if Figures 1 to 8 As shown, the area where the three groups of fairleads 3 are rooted is divided into three independent fairlead sections 2, and the area where the three groups of anchor chain pipes 41 are rooted is divided into three independent anchor chain pipe sections 4, and the anchor chain pipe sections 4 are located directly above the fairlead sections 2 and are arranged one by one. Four fairleads are evenly spaced on each fairlead section 2, and four anchor chain pipes 41 are evenly spaced on each anchor chain pipe section 4, and the fairleads 3 and the anchor chain pipes 41 are arranged one by one.

[0032] By prefabricating the fairlead segment 2, the accuracy of the parallelism and spacing values ​​between the horizontal bracket plates of the same group of fairleads 3 on the fairlead segment 2 meets ±2mm; a reference datum for the theoretical installation position of the fairlead 3 is set on the fairlead segment 2, and a reference datum for the theoretical installation position of the fairlead 3 is set at the whole ship loading site, and the fairlead segment 2 is loaded in place according to the above datum; prefabricating the anchor chain pipe segment 4; according to the reference datum, loading the anchor chain pipe segment 4 onto the hull 1; refitting the installation datum point of the fairlead 3 on the hull 1 with the center of the anchor chain pipe 41 as the datum; welding the fairlead 3 to the hull 1 according to the installation datum point, not only realizing the precise installation between the fairlead 3 and the anchor chain pipe 41, but also realizing the installation between adjacent fairleads 3, with high installation precision, improved work efficiency and reduced construction cost.

[0033] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A high-precision installation method for a cylindrical floating production device fairlead, characterized in that: The steps include: S1. Prefabricated fairlead sections. The parallelism and spacing accuracy between the horizontal bracket plates of the same group of fairleads on the fairlead sections shall meet ±2mm; S2. Set a reference datum for the theoretical installation position of the fairlead on the fairlead section, and set a reference datum for the theoretical installation position of the fairlead at the whole ship loading site, and load the fairlead section into place according to the reference datum; S3, prefabricated anchor chain pipe sections; S4. According to the reference datum in S2, the anchor chain pipe is mounted on the hull in sections; S5. Re-fit the installation reference point of the fairlead on the hull with the center of the hawse pipe as the reference; S6. Weld the fairlead to the hull according to the installation reference point in S5.

2. The high-precision installation method of a cylindrical floating production device fairlead according to claim 1, characterized in that: When prefabricating the fairlead in sections, a 100 mm cutting margin is reserved on the horizontal bracket plate of the fairlead, and the installation reference point of the fairlead is measured and marked in the area where the fairlead is installed in the fairlead section.

3. The high-precision installation method of a cylindrical floating production device fairlead according to claim 1, characterized in that: In the assembly area of ​​the whole ship, draw the theoretical radial angle line of each fairlead and the theoretical projection point on the angle line as the reference for installing the fairlead sections. At the same time, based on this, draw the theoretical projection point of the center of each anchor chain pipe as the reference for installing the anchor chain pipe sections.

4. The high-precision installation method of a cylindrical floating production device fairlead according to claim 3, characterized in that: Before installing the anchor chain pipe sections on the hull, the alignment deviation between the anchor chain pipe and the theoretical projection point of the anchor chain pipe center is within ±2mm.

5. The high-precision installation method of a cylindrical floating production device fairlead according to claim 1, characterized in that: The method of refitting the installation reference point of the fairlead on the hull based on the center of the anchor chain pipe is to make a permanent mark on the projection point of the center of the anchor chain pipe on the ground, and refit the projection point of the central axis of the fairlead shaft in combination with the angle line as the actual reference point for the installation of the fairlead.

6. The high-precision installation method of a cylindrical floating production unit fairlead according to claim 1, characterized in that: Calculate the cutting amount of the horizontal bracket plate according to the projection point of the central axis of the fairlead shaft, reserve 3-5mm welding compensation, draw the excess cutting line of the horizontal bracket plate, and cut off the excess.

7. The high-precision installation method of a cylindrical floating production unit fairlead according to claim 1, characterized in that: When the fairlead is welded to the hull, first spot weld the fairlead to the hull, use a total station to measure the position deviation between the projection point of the fairlead shaft centerline and the anchor chain pipe reference point, the parallelism of the upper and lower supports, the spacing deviation and the verticality of the shaft. After all are qualified, weld the fairlead to the hull.

8. The high-precision installation method of a cylindrical floating production unit fairlead according to claim 1, characterized in that: When welding the upper and lower supports of the fairlead to the hull, first weld the horizontal support plate of the support, and then weld the vertical support plate. The vertical support plate must be welded symmetrically on both sides, and the horizontal support plate must be welded from the middle to both sides at the same time, and the upper and lower supports must be welded symmetrically.

9. The high-precision installation method of a cylindrical floating production device fairlead according to claim 1, characterized in that: The rooting area of ​​the three groups of fairleads is divided into three independent fairlead sections, and the rooting area of ​​the three groups of anchor chain pipes is divided into three independent anchor chain pipe sections. The anchor chain pipe sections are located directly above the fairlead sections and are arranged one by one.

10. The high-precision installation method of a cylindrical floating production device fairlead according to claim 9, characterized in that: Four fairleads are evenly spaced apart on each fairlead segment, four anchor chain pipes are evenly spaced apart on each anchor chain pipe segment, and the fairleads and anchor chain pipes are arranged in one-to-one correspondence.

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