Installation and positioning method of rocker arm and hinged parts of jacket launching barge

Abstract

The present invention relates to a method for installing and positioning a rocker arm and a hinged part of a jacket launching barge. The method for installing and positioning a rocker arm and a hinged part of a jacket launching barge described in the present invention comprises the following steps: removing the old rocker arm; marking and determining the center line of the hull on the deck surface of the hull; marking and determining the axis point of the semicircular sleeve of the old hinged part on the longitudinal walls at both ends of each old hinged part; marking the contour line of the old hinged part on the longitudinal walls at both ends of each old hinged part; removing the old hinged part; installing and positioning the new hinged part so that the axis point of the semicircular sleeve of the new hinged part coincides with the axis point of the semicircular sleeve of the marked old hinged part, and the contour of the new hinged part is aligned with the contour line of the old hinged part; installing and positioning the new rocker arm. The method for installing and positioning a rocker arm and a hinged part of a jacket launching barge described in the present invention is simple to operate, has a small positioning deviation, good positioning quality, and high positioning accuracy, and improves the installation and positioning efficiency of replacing the rocker arm and hinged part.

Description

Technical Field

[0001] The invention relates to the technical field of ship equipment, in particular to a method for installing and positioning a rocker arm and a hinged component of a jacket launching barge. Background Art

[0002] The "Hai Yang Shi You 229" has a 60,000-ton load capacity, can launch 38,500-ton jackets, and can install 35,000-ton modules by float-over. The jacket launching process involves the jacket sliding down from a launching barge with a certain trim, using its own weight, until it separates from the barge and reaches a stable position in the water. The rocker arm and hinge are key components of the jacket launching barge. The rocker arm's function is to tilt the jacket as the jacket slides into the water, allowing the full weight of the jacket to rest on the rocker arm. This launching method reduces construction risk, eliminates the need for large floating cranes, and can save millions of yuan in launching costs each time, making it highly commercializable. During operation, the rocker arm's pivot axis rotates around the hinge from a horizontal position toward the stern of the ship to an 89-degree vertical position.

[0003] See also Figure 1-Figure 3 The jacket launching barge is equipped with two rockers 1, two hinges 2, and four longitudinal walls 3 at the stern. The two rockers and two hinges are symmetrically arranged about the hull centerline CL. The longitudinal walls 3 are arranged in pairs at both ends of each hinge 2; that is, each hinge 2 is arranged between two longitudinal walls 3. The hinge 2 supports the rocker 1. Figure 4 The hinge 2 includes a support 21 and a semicircular sleeve 22. The support 21 is installed on the stern of the ship, and the semicircular sleeve 22 is fixed on the support 1. The semicircular sleeve 22 is the core part of the hinge 2. The rotating shaft of the rocker arm can rotate relative to the semicircular sleeve. Installing a rocker arm locker can be used to lock the rotating shaft of the rocker arm 1 so that it does not rotate.

[0004] With the long-term use of the rocker arms and hinges of jacket launching barges, due to engineering modification requirements or other needs, the rocker arms and hinges of jacket launching barges need to be replaced. The new rocker arms and hinges are replaced based on the old rocker arms and hinges of the original ship. The replacement rocker arms and hinges must meet the positioning quality and accuracy requirements. Therefore, it is necessary to adopt appropriate and efficient installation and positioning methods to ensure the installation quality and high accuracy of the replacement rocker arms and hinges. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a method for installing and positioning the replacement of the rocker arm and hinged parts of a jacket launching barge, which has the advantages of simple operation, small positioning deviation, good positioning quality, high positioning accuracy, and high installation and positioning efficiency of the replacement of the rocker arm and hinged parts.

[0006] A method for installing and positioning a rocker arm and a hinged member of a jacket launching barge comprises the following steps:

[0007] Remove the old rocker arm;

[0008] Mark and determine the hull centerline on the deck surface of the hull;

[0009] Mark and determine the axis points of the semicircular sleeves of each old hinge on the longitudinal walls at both ends of each old hinge, so that the axis points of the semicircular sleeves of each old hinge are on the same straight line, and the straight line is perpendicular to the centerline of the hull; otherwise, re-mark the axis points;

[0010] Mark the outline of the old hinge on the longitudinal walls at both ends of each old hinge;

[0011] Remove the old hinge;

[0012] Install and position the new hinge so that the axis point of the semicircular sleeve of the new hinge coincides with the axis point of the semicircular sleeve of the marked old hinge, and the outline of the new hinge is aligned with the outline of the old hinge;

[0013] Install and position the new rocker arm. The new rocker arm and the new hinge are replaced on the basis of the old rocker arm and the old hinge of the original hull, and the external dimensions of the new rocker arm and the new hinge are consistent with those of the old rocker arm and the old hinge of the original hull. The method for installing and positioning the rocker arm and the hinge of the conductor frame launching barge described in the present invention determines the positioning cores of the rocker arm and the hinge: the center line of the hull, the axis point of the semicircular sleeve of the hinge, that is, first determine the center line of the hull and mark it on the hull deck; determine the axis point of the semicircular sleeve of the old hinge and mark it on the longitudinal wall, requiring the axis point to be on the same straight line parallel to the horizontal plane and perpendicular to the center line of the hull; first determine these two, and complete the subsequent high-precision installation and positioning of the new hinge and the new rocker arm. The axis point of the semicircular sleeve of the new hinge is concentrically aligned with the axis point of the semicircular sleeve of the marked old hinge, the outline of the new hinge is aligned with the outline line of the old hinge, the new hinge is installed and positioned, and then the new rocker arm is positioned and installed.

[0014] The method for installing and positioning the rocker arm and hinged parts of a jacket launching barge of the present invention is simple to operate, has small positioning deviation, good positioning quality, high positioning accuracy, and improves the installation and positioning efficiency of replacing the rocker arm and hinged parts.

[0015] Furthermore, the method for marking and determining the hull centerline includes: marking multiple hull centerline points on the deck surfaces of multiple hull sections; ensuring that the multiple hull centerline points are on the same straight line, otherwise re-marking the multiple hull centerline points; and marking the line connecting the multiple hull centerline points on the same straight line as the hull centerline. Because the actual position of the hull centerline cannot be seen from the hull deck, multiple marked points are determined on the deck surfaces of multiple hull sections as the hull centerline points. The multiple marked points are on the same straight line, and the connecting line is marked on the deck surface as the hull centerline, which is convenient for subsequent measurement reference.

[0016] Furthermore, the method for marking the axis point includes: using a steel ruler to project different positions of the inner surface of the semicircular sleeve of the hinge onto the longitudinal wall, obtaining projection points and marking them as multiple marking points; using a compass to draw an arc on the longitudinal wall with each marking point as the center and the radius of the semicircular sleeve of the old hinge as the compass radius; the intersection of the arcs drawn by the multiple marking points is the axis point of the semicircular sleeve of the old hinge, and is marked. Using a steel ruler and compass, the inner surface of the semicircular sleeve of the old hinge is projected onto the longitudinal wall to form marking points, and arcs are drawn with the marking points as the centers. The intersection of the arcs is reflected on the longitudinal wall as the axis point, and sample punching points are marked. The operation is simple and the accuracy is high.

[0017] Furthermore, when the longitudinal walls at both ends of the semicircular sleeve of the old hinge need to be partially replaced, and the marked axis point is located in the partially replaced area of ​​the longitudinal wall, the method for installing and positioning the rocker arm and hinge of the jacket launching barge further includes: before marking the outline of the old hinge, shifting the axis point;

[0018] The axis point displacement includes: leading the axis point to the longitudinal wall outside the partial renewal area; renewing the partial renewal area of ​​the longitudinal wall, and then leading the drawn axis point back to the partial renewal area after renewal and marking it.

[0019] When it is necessary to partially replace the longitudinal walls at both ends of the old hinge, the axis point needs to be shifted. First, the axis point is led out to the longitudinal wall outside the partial replacement area. After the partial replacement area is replaced, it is led back to the axis point. The operation is simple and the axis point shifting accuracy is high.

[0020] Furthermore, when marking the outline of the old hinge, a check line is also marked on the longitudinal walls at both ends of each old hinge. The check line has the same shape as the outline and is 100 mm away from the outline. The check line facilitates the subsequent installation and positioning of the new hinge. After the outline of the new hinge is aligned with the outline of the old hinge, the positioning accuracy of the new hinge is verified, which can improve the accuracy of the alignment of the new hinge outline with the old hinge outline.

[0021] Furthermore, the method for removing the old hinge comprises: reflecting the size of the new hinge to the position of the old hinge to draw a cutting line, and cutting and removing the old hinge according to the drawn cutting line.

[0022] Furthermore, the axis center point of the semicircular sleeve of the new hinge is concentric with the axis center point of the marked semicircular sleeve of the old hinge, with a deviation of no more than 1 mm.

[0023] Furthermore, after installing and positioning the new hinge, it is also necessary to measure the distance from the hinge centerline of the new hinge to the hull centerline. The actual measured value of the distance from the hinge centerline of the new hinge to the hull centerline deviates from the theoretical value by no more than 2 mm.

[0024] Furthermore, the method for installing and positioning the new rocker arm includes: marking and determining a rocker center inspection line of the new rocker arm on the hull deck according to a set distance between the rocker center line of the new rocker arm and the hull center line, wherein the distance between the rocker center inspection line of the new rocker arm and the vertical plane where the hull center line is located is equal to the set distance between the rocker center line of the new rocker arm and the vertical plane where the hull center line is located; symmetrically installing a guide positioning code plate on the rocker center inspection line of the new rocker arm; installing and positioning the new rocker arm so that the new rocker arm is snapped into the guide positioning code plate and the rocker center line of the new rocker arm is aligned with the marked rocker center inspection line. By marking and determining the rocker center inspection line of the new rocker arm on the hull deck, installing the guide positioning code plate; snapping the new rocker arm into the guide positioning code plate so that the rocker center line of the new rocker arm is aligned with the marked rocker center inspection line, the new rocker arm is installed with high precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a top view of the jacket launching barge;

[0026] Figure 2 for Figure 1 Schematic diagram of the stern position;

[0027] Figure 3 This is a side view of the stern position;

[0028] Figure 4 is a structural diagram of a hinge;

[0029] Figure 5 A schematic diagram of the positions of multiple sections of the hull;

[0030] Figure 6 for Figure 5 The local schematic diagram of point Ⅰ in the middle;

[0031] Figure 7 for Figure 5 Partial schematic diagram of the middle II;

[0032] Figure 8 for Figure 5Partial schematic diagram of point III in the middle;

[0033] Figure 9 for Figure 5 Partial schematic diagram of position IV in the middle;

[0034] Figure 10 for Figure 5 A partial schematic diagram of point V in the middle;

[0035] Figure 11 for Figure 5 A partial schematic diagram of the middle VI;

[0036] Figure 12 It is a schematic diagram of the hull centerline point and the hull centerline on the deck surface;

[0037] Figure 13 Schematic diagram of using a steel ruler to mark the intersection of the old hinged semicircular sleeve and the longitudinal wall

[0038] Figure 14 A schematic diagram of the axis point of the semicircular sleeve of the hinge marked on the longitudinal wall;

[0039] Figure 15 This is a schematic diagram of the four axis points marked on the longitudinal wall;

[0040] Figure 16 A schematic diagram of the local replacement area and the derived pivot point on the longitudinal wall;

[0041] Figure 17 A schematic diagram of the local renewal area and the pivot point of the lead-back on the longitudinal wall;

[0042] Figure 18 This is a schematic diagram showing the axis line perpendicular to the hull centerline;

[0043] Figure 19 A schematic diagram of the outline and inspection lines of the old hinges marked on the longitudinal wall;

[0044] Figure 20 Dimensional measurements for the new hinge;

[0045] Figure 21 Schematic diagram of lifting the new hinge;

[0046] Figure 22 Schematic diagram of the position of the center line of the hinge and the center line of the hull;

[0047] Figure 23 This is a schematic diagram of the new rocker arm center inspection line on the deck surface;

[0048] Figure 24 This is a side installation diagram of the new rocker arm and guide positioning code plate;

[0049] Figure 25for Figure 24 Schematic diagram of the guide positioning code plate and new rocker arm at FR6;

[0050] Figure 26 for Figure 25 An enlarged schematic diagram of point M;

[0051] Figure 27 Top view of the new rocker arm positioned for installation. DETAILED DESCRIPTION

[0052] In the description of the present invention, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0053] Example 1

[0054] This plan is based on the upgrade and reconstruction project of the "Hai Yang Shi You 229" vessel, which is a jacket launching barge. Figure 1-Figure 3 At the stern of the ship, there are two rocker arms 1, two hinges 2, and four longitudinal walls. The two rocker arms 1 and the two hinges 2 are symmetrically arranged about the centerline CL of the hull. The longitudinal walls 3 are arranged in pairs at both ends of each hinge 2, and each hinge 2 is arranged between two longitudinal walls 3. The hinge 2 supports the rocker arm 1. Figure 4 The hinge 2 includes a support 21 and a semicircular sleeve 22. The semicircular sleeve 22 is fixed on the support 1. Figure 1 and Figure 2 Taking the two sides of the hull's bow and stern (or the hull's centerline CL) as the left-right direction, the longitudinal walls 3 at the ends of the two hinges 2 are, in order: the first longitudinal wall (left 18,000-meter longitudinal wall) 31, the second longitudinal wall (left 4,500-meter longitudinal wall) 32, the third longitudinal wall (right 4,500-meter longitudinal wall) 33, and the fourth longitudinal wall (right 18,000-meter longitudinal wall) 34. The distances from the hull's centerline CL to the first and fourth longitudinal walls 31 and 34 are equal; the distances from the hull's centerline CL to the second and third longitudinal walls 32 and 33 are equal. The left hinge is located between the first longitudinal wall (left 18,000-meter longitudinal wall) 31 and the second longitudinal wall (left 4,500-meter longitudinal wall) 32, while the right hinge is located between the third longitudinal wall (right 4,500-meter longitudinal wall) 33 and the fourth longitudinal wall (right 18,000-meter longitudinal wall) 34.

[0055] This example uses the jacket launching barge "Hai Yang Shi You 229" as an example. Due to engineering requirements, the rocker arm 1 and hinge 2 of the jacket launching barge "Hai Yang Shi You 229" need to be replaced with new ones. The new hinge 2 has the same dimensions as the old one. Before implementing the following method, the old rocker arm is removed.

[0056] The method for installing and positioning the rocker arm 1 and the hinge 2 of the jacket launching barge of this embodiment includes the following steps:

[0057] S1: Remove the old rocker arm;

[0058] S2: Mark and determine the hull centerline CL on the deck surface of the hull;

[0059] S3: Mark and determine the axis points of the semicircular sleeves 22 of each old hinge 2 on the longitudinal walls 3 at the left and right ends. The axis point is the intersection of the axis of the semicircular sleeve 22 and the longitudinal wall 3, that is, the projection point of the axis of the semicircular sleeve 22 on the longitudinal wall 3. Ensure that the axis points of the semicircular sleeves 22 of each old hinge 2 are on the same straight line, and the straight line is perpendicular to the centerline of the hull.

[0060] S4: Mark the outline and inspection line of the old hinge 2 on the longitudinal walls 3 at the left and right ends of each old hinge 2;

[0061] S5: Remove the old hinge 2;

[0062] S6: Install and position the new hinge 2 so that the axis point of the semicircular sleeve of the new hinge 2 coincides with the axis point of the semicircular sleeve of the marked old hinge 2, and the outline of the new hinge 2 is aligned with the outline of the old hinge 2;

[0063] S7: Install and position the new rocker arm 1.

[0064] The following specifically describes in detail the installation and positioning method of the jacket launching barge rocker arm 1 and the hinged member 2 of this embodiment.

[0065] S2: Mark and determine the hull centerline CL on the deck surface of the hull, including the following steps:

[0066] S21: Mark multiple hull centerline points on the deck surfaces of multiple hull sections of the hull;

[0067] S22: Determine that a plurality of hull centerline points are on the same straight line, and mark a line connecting the plurality of hull centerline points as a hull centerline.

[0068] Because the actual position of the hull centerline CL cannot be seen on the hull deck surface, and there are longitudinal bones, center dragon and other structures on the back of the deck, the center line of the center dragon plate thickness is the hull centerline, that is, the hull centerline is on the back of the deck. Therefore, the hull centerline on the back of the deck needs to be reflected on the deck surface and marked, and then the hull centerline point is marked for subsequent measurement reference.

[0069] This embodiment, based on the different positions of the deck surface on the hull and actual conditions, marks multiple hull centerline points on multiple hull sections, confirming that the multiple hull centerline points are on the same straight line. An ink fountain is then used to connect the multiple hull centerline points and mark them on the hull deck surface with a stroke to form the hull centerline. This embodiment and other embodiments can also use the structure, welds, openings, etc. near the deck surface of each hull section as a reference to mark and determine the hull centerline points of each section.

[0070] The hull is divided into several rib positions FR0, FR1, FR2, ..., FRn-1, FRn in sequence from the stern to the bow.

[0071] Specifically, S21: In this embodiment, please refer to Figure 5-Figure 12 , six hull centerline points are marked on the decks of the six hull sections in the bow and stern directions, namely, mark point P1, mark point P2, mark point P3, mark point P4, mark point P5, and mark point P6. The details are as follows:

[0072] S211: Mark the segmented hull centerline CL1 on the deck surface between the stern positions FR0 and FR1, and mark point P1 on the segmented hull centerline CL1:

[0073] On the deck between FR0 and FR1, the hull centerline of the section is located on the reverse side of the deck. The second longitudinal wall 32 and the third longitudinal wall 33 are at equal vertical distances from the hull centerline of the reverse side of the deck. Furthermore, a fore-and-aft weld is located on one side of the hull centerline of the reverse side of the deck, and the weld is visible on both the deck surface and the reverse side. Therefore, in this embodiment, based on the structure of the FR0-FR1 section, the hull centerline of the reverse side of the FR0-FR1 deck is reflected on the deck surface, as follows:

[0074] See also Figure 6, mark a straight line CL1 in the bow and stern direction on the deck surface between the FR0 and FR1 ribs, and determine the vertical distances from the second longitudinal wall 32 and the third longitudinal wall 33 to the straight line CL1 from the deck surface to be B1 and B2 respectively, ensuring that B1=B2. Then the straight line CL1 is the segmented hull centerline on the deck surface between the FR0 and FR1 ribs, and mark point P1 on the straight line CL1. The marked point P1 is the hull centerline point. In order to further verify the accuracy of the marked point P1 as the hull centerline point, determine the weld point from the reverse side of the deck. The vertical distance from the midpoint in the seam width direction to the hull centerline on the opposite side of the deck is B3, and the vertical distance from the marked point P1 on the straight line CL1 on the deck surface to the midpoint in the weld width direction is compared to see if it is equal to B3; if they are equal, the marked point P1 can be used as the hull centerline point; if they are not equal, the straight line CL1 and the marked point P1 need to be remarked until the marked point P1 determined by the two measurement methods are in the same position, that is, the vertical distance from the marked point P1 on the straight line CL1 on the deck surface to the weld is equal to B3.

[0075] S212: Mark the hull centerline CL2 on the deck between FR9 and FR10, and mark point P2 on the segmented hull centerline CL2:

[0076] The deck between FR9 and FR10 has the hull centerline of this section on the reverse side of the deck, and there are fore-and-aft welds on both the left and right sides of the hull centerline on the reverse side of the deck. The left and right welds are visible on both the deck surface and the reverse side of the deck, and the vertical distance from the hull centerline on the reverse side of the deck to the midpoint of the width direction of the left and right welds is equal. Therefore, in this embodiment, based on the structure of the FR9-FR10 rib position, the hull centerline on the reverse side of the deck between FR9 and FR10 is reflected on the deck surface, as follows:

[0077] See also Figure 7 Mark a bow and stern straight line CL2 on the deck surface between FR9 and FR10, and determine the vertical distances from the left and right welds to the straight line CL2 to be B4 and B5 respectively, ensuring that B4 = B5. Then the straight line CL1 is the segmented hull centerline on the deck surface between FR9 and FR10, and mark point P2 on the straight line CL2. The marked point P2 is the hull centerline point;

[0078] S213: Mark the hull centerline CL3 on the deck between FR24 and FR25, and mark point P3 on the segmented hull centerline CL3:

[0079] See also Figure 8The deck between FR24 and FR25 has the hull centerline of this section on the reverse side of the deck, and has fore-and-aft welds on both the left and right sides of the hull centerline of this section on the reverse side of the deck. The vertical distances from the hull centerline on the reverse side of the deck to the midpoint of the width of the left and right welds are equal, and a square skylight is located on one side of the hull centerline on the reverse side of the deck. The left and right welds, as well as the skylight, can be seen from both the deck surface and the reverse side of the deck. Therefore, in this embodiment, based on the structure of FR24 and FR25, the hull centerline of the reverse side of the deck at FR24 and FR25 is reflected on the deck surface, as follows:

[0080] Mark a bow and stern straight line CL3 on the deck surface between FR24 and FR25, and determine the vertical distances from the midpoints of the left and right weld widths to the straight line CL3 to be B7 and B8 respectively, ensuring that B7 = B8. Then the straight line CL3 is the centerline of the segmented hull on the deck surface between FR24 and FR25. Mark point P3 on the straight line L3, and the marked point P3 is the hull centerline point;

[0081] To further verify the accuracy of the marked point P3 as the hull centerline point, the vertical distance from the side of the skylight on the reverse side of the deck near the hull centerline to the hull centerline on the reverse side of the deck is determined to be B6, and the vertical distance from the marked point P3 on the straight line CL3 on the deck surface to the side of the skylight on the deck surface near the straight line CL3 on the deck surface is compared to see if it is equal to B6; if they are equal, the marked point P3 can be used as the hull centerline point; if they are not equal, it is necessary to remark the straight line CL3 and the marked point P3 until the marked point P3 determined by the two measurement methods are in the same position, that is, the vertical distance from the marked point P3 on the straight line CL3 on the deck surface to the side of the skylight on the deck surface near the straight line L3 on the deck surface is equal to B6.

[0082] S214: Mark the hull centerline CL4 on the deck between FR54 and FR55, and mark point P4 on the block hull centerline CL4:

[0083] The deck between FR54 and FR55 has the hull centerline of this section on the reverse side of the deck, and has fore-and-aft welds on both the left and right sides of the hull centerline of this section on the reverse side of the deck. The vertical distances from the hull centerline on the reverse side of the deck to the midpoint of the weld width on both sides are equal, and there is a square skylight on one side of the hull centerline on the reverse side of the deck. The left and right welds, as well as the skylight, can be seen from both the deck surface and the reverse side of the deck. Therefore, in this embodiment, based on the structure of FR54 and FR55, the hull centerline of the reverse side of the deck between FR54 and FR55 is reflected on the deck surface, as follows:

[0084] See also Figure 9Mark a bow and stern straight line CL4 on the deck surface between FR54 and FR55, and determine the vertical distances from the midpoints of the left and right weld widths to the straight line CL4 to be B10 and B11 respectively, ensuring that B10 = B11. The straight line CL4 is the centerline of the segmented hull on the deck surface between FR54 and FR55. Mark point P4 on the straight line CL4, and the marked point P4 is the hull centerline point;

[0085] To further verify the accuracy of the marked point P4 as the hull centerline point, the vertical distance from the side of the skylight on the reverse side of the deck near the hull centerline to the hull centerline on the reverse side of the deck is determined to be B9, and the vertical distance from the marked point P4 on the straight line CL4 on the deck surface to the side of the skylight on the deck surface near the straight line CL4 on the deck surface is compared to see if it is equal to B9; if they are equal, the marked point P4 can be used as the hull centerline point; if they are not equal, it is necessary to re-mark the straight line CL4 and the marked point P4 until the marked point P4 determined by the two measurement methods are at the same position, that is, the vertical distance from the marked point P4 on the straight line CL4 on the deck surface to the side of the skylight on the deck surface near the straight line CL4 on the deck surface is equal to B9.

[0086] S215: Mark the hull centerline CL5 on the deck surface at FR70 and mark point P5 on the block hull centerline CL4:

[0087] On the FR70 deck, the hull centerline of the segment is located on the reverse side of the deck, and the left and right upper sidewalls are constructed on the deck surface. The left and right upper sidewalls are symmetrically arranged about the hull centerline on the reverse side of the deck. There are fore-and-aft welds on both the left and right sides of the hull centerline on the reverse side of the deck. The left and right welds are visible on both the deck surface and the reverse side of the deck, and the vertical distance from the hull centerline on the reverse side of the deck to the midpoint of the width of the left and right welds is equal. Therefore, in this embodiment, based on the structure of the FR70, the hull centerline on the reverse side of the FR70 deck is reflected on the deck surface, as follows:

[0088] See also Figure 10 , mark a bow and stern straight line CL5 on the deck of FR70, and determine the vertical distances from the left and right upper sidewall plates to the straight line CL5 from the deck surface to be B12 and B13 respectively, ensuring that B12=B13. Then the straight line L5 is the centerline of the segmented hull on the deck of FR70, and mark point P5 on the straight line L5. The marked point P5 is the hull centerline point;

[0089] To further verify the accuracy of the marked point P5 as the hull centerline point, the vertical distances from the left and right welds on the reverse side of the deck to the hull centerline on the reverse side of the deck are determined to be B14 and B15 respectively, and the vertical distances from the marked point P5 on the straight line CL5 on the deck surface to the middle point of the left and right welds on the deck surface in the width direction are compared to see if they are equal to B14 and B15; if they are equal, the marked point P5 can be used as the hull centerline point; if they are not equal, it is necessary to re-mark the straight line CL5 and the marked point P5 until the marked point P5 determined by the two measurement methods are in the same position, that is, the vertical distances from the marked point P5 on the straight line CL5 on the deck surface to the middle point of the left and right welds on the deck surface in the width direction are equal to B14 and B15.

[0090] S216: Mark the hull centerline CL6 on the deck between FR85 and FR86, and mark point P6 on the segmented hull centerline CL6:

[0091] The deck between FR85 and FR86 has the hull centerline of that section on the reverse side of the deck, and has fore-and-aft welds on both the left and right sides of the hull centerline on the reverse side of the deck. The welds are visible on both the deck surface and the reverse side, and the vertical distance from the hull centerline on the reverse side of the deck to the welds on both sides is equal. Therefore, in this embodiment, based on the structure of FR85 and FR86, the hull centerline on the reverse side of the decks FR85 and FR86 is reflected on the deck surface, as follows:

[0092] See also Figure 11 , mark a straight line CL6 on the deck surface between FR85 and FR86, and determine the vertical distances from the left and right welds to the straight line CL6 to be B16 and B17 respectively, ensuring that B16=B17. Then the straight line CL6 is the centerline of the segmented hull between FR85 and FR86. Mark point P6 on the straight line CL6, and the marked point P6 is the hull centerline point;

[0093] S22: In this embodiment, please refer to Figure 12 , determine that the six hull centerline points, namely mark point P1, mark point P2, mark point P3, mark point P4, mark point P5, and mark point P6, are on the same straight line; mark the six hull centerline points with an ink fountain line to form the hull centerline.

[0094] After marking six points on each section of the hull deck (i.e., points P1, P2, P3, P4, P5, and P6), it is necessary to verify that the six points are aligned. Based on the equipment and structures on the hull deck, a total station is used in this embodiment to establish a coordinate system and perform segmented verification of the six marked points.

[0095] Step S22 is specifically as follows:

[0096] S221: Please refer to Figure 12 Set up the total station at point a, located on the ship's deck where markers P1, P2, P3, and P4 are visible. Establish a coordinate system with marker P1 as the origin, P4 as the X-axis, and the line passing through P1, perpendicular to the line connecting P1 and P4, and parallel to the horizontal plane, as the Y-axis. Since this marker inspection doesn't require a Z-axis height, only the x and y values ​​are required. Confirm the coordinates of P1 (xP1, yP1) and P4 (xP4, yP4), and measure markers P2 (xP2, yP2) and P3 (xP3, yP3).

[0097] S222: At the same time, use another total station to set up at point b. Point b is selected on the deck of the hull where the marker points P3, P4, P5 and P6 can be seen. Use marker point P3 as the coordinate origin, marker point P6 as the X-axis direction point, and the line passing through the coordinate origin P3, perpendicular to the P3-P6 line and parallel to the horizontal plane as the Y-axis to establish a coordinate system, confirm the coordinate values ​​​​P3 (xP3, yP3), P6 (xP6, yP6), and measure the marker points P4 (xP4, yP4), P5 (xP5, yP5) respectively.

[0098] S223: Compare the coordinate y value data yP1, yP2, yP3, yP4, yP5, yP6 to see if they are equal and within the allowable error range of ±2mm. If they are within the allowable error range, then mark points P1, P2, P3, P4, P5, and P6 are the hull centerline points; if they exceed the allowable error, then the excess points need to be adjusted until the values ​​are within the allowable error range.

[0099] S224: Please refer to Figure 12 According to the 6 determined hull centerline points, namely, mark point P1, mark point P2, mark point P3, mark point P4, mark point P5, and mark point P6, use an ink fountain to connect the 6 hull centerline points and mark them on the hull deck surface with a spring line to form the hull centerline CL.

[0100] S3: Mark and determine the axis points of the semicircular sleeves 22 of each old hinge 2 on the longitudinal walls 3 at the left and right ends of each old hinge 2, so that the axis points of the semicircular sleeves 22 of each old hinge 2 are on the same straight line, and the straight line is perpendicular to the hull centerline CL.

[0101] Before removing the old hinge 2, mark the axis of the semicircular sleeve 22 of the old hinge 2 to ensure that the axis of the semicircular sleeve 22 of the newly installed new hinge 2 is at the same position as the axis of the semicircular sleeve 22 of the old hinge 2.

[0102] In this embodiment, please refer to Figure 13 and Figure 14 , use a steel ruler to project different positions of the inner surface of the semicircular sleeve of the hinge onto the longitudinal wall 3, obtain the projection points and mark them into multiple marking points; use a compass to draw an arc on the longitudinal wall 3 with each marking point as the center of the circle and the radius of the semicircular sleeve of the old hinge 2 as the compass radius; the intersection of the arcs drawn by multiple marking points is the axis point of the semicircular sleeve of the old hinge 2, and mark the intersection point.

[0103] Specifically, in this embodiment, step S3 includes:

[0104] S31: Please refer to Figure 13 , place a steel ruler on the inner side of the semicircular sleeve 22 of the old hinge 2, extend the bottom edge of the 2-meter steel ruler close to the inner side of the semicircular sleeve 22 of the old hinge 2 toward the longitudinal wall, so that the side edge of the steel ruler closes the longitudinal wall at one end of the old hinge 2, and the steel ruler is perpendicular to the longitudinal wall 3. The point where the bottom edge of the steel ruler contacts the longitudinal wall is marked as a marking point; the steel ruler will be placed at different positions on the inner side of the semicircular sleeve 22 of the old hinge 2, and the above operation will be repeated to mark 6 marking points on the longitudinal wall, namely, marking point P11, marking point P12, marking point P13, marking point P14, marking point P15, and marking point P16;

[0105] S32: According to the radius of the semicircular sleeve 22 of the new and old hinges 2 is 440mm, adjust the compass to the radius of 440mm, refer to Figure 14 , place one end of the compass on the marking points P11, P12, P13, P14, P15, and P16 respectively, and draw an arc on the longitudinal wall 3 with the other end; the intersection of the arcs drawn by the 6 marking points is the axis point of the semicircular sleeve 22 of the old hinge 2, and mark the intersection point, which is the axis point;

[0106] See also Figure 15 The axis points are marked on the longitudinal walls 3 at both ends of the two old hinges 2. A total of four axis points are marked on the two old hinges 2, namely axis point A, axis point B, axis point C, and axis point D; that is, axis point A is marked on the first longitudinal wall 31, axis point B is marked on the second longitudinal wall 32, axis point C is marked on the third longitudinal wall 33, and axis point D is marked on the fourth longitudinal wall 34.

[0107] S33: Check and confirm that the four axis points are on the same line.

[0108] After marking the axis points on the longitudinal wall 3, use a total station to verify that the four marked axis points are on the same straight line, which is the axis line.

[0109] Step S33 includes:

[0110] S331: Please refer to Figure 15 Set up the total station at setup point c, located outside the ship where three axis points are visible: axis point A on the first longitudinal wall 31, axis point D on the fourth longitudinal wall 34, and axis point B on the second longitudinal wall 32. With axis point A as the origin and axis point D as the orientation point, establish a coordinate system with the AD direction as the X-axis, the Y-axis perpendicular to the X-axis and pointing toward the bow, and the Z-axis perpendicular to the plane defined by the X and Y axes and pointing upward. The coordinate values ​​of the three measurement points are axis point A (0, 0, 0), axis point D (xD1, 0, 0), and axis point B (xB1, yB1, zB1).

[0111] S332: Please refer to Figure 15 Set up the total station at point d, located outside the ship where three axis points are visible: axis point A on the first longitudinal wall 31, axis point D on the fourth longitudinal wall 34, and axis point C on the third longitudinal wall 33. With point A as the origin and point D as the orientation point, establish a coordinate system with the AD direction as the X-axis, the Y-axis perpendicular to the X-axis and pointing toward the bow, and the Z-axis perpendicular to the plane defined by the X and Y axes and pointing upward. The coordinate values ​​of the three measurement points are axis point A (0, 0, 0), axis point D (xD1, 0, 0), and axis point C (xC1, yC1, zC1).

[0112] S333: Compare the differences between the bow and stern directions and the height direction values ​​of the axis points B and C and the axis points A and D. That is, compare the differences between the y and z values ​​of the axis points B (yB1, zB1) and C (yC1, zC1) and the axis points A (0, 0) and D (0, 0). The allowable error is ±1mm. If the difference is within the allowable error range, no adjustment is required. If the difference exceeds the allowable error, the axis points need to be adjusted.

[0113] In this embodiment, according to the engineering requirements, it is also necessary to partially replace the longitudinal walls 3 at the left and right ends of the old hinge 2, that is, the first longitudinal wall 31, the second longitudinal wall 32, the third longitudinal wall 33, and the fourth longitudinal wall 34. According to the engineering requirements, the longitudinal walls 3 at the left and right ends of the two old hinges 2 are partially replaced, and then the old hinges 2 are removed and the new hinges 2 are installed. Figure 16 and Figure 17 , the local renewal area 30 on the longitudinal wall 3; because the axis point of the mark is located in the local renewal area 30, the axis point of the local renewal area 30 on the longitudinal wall 3 needs to be shifted.

[0114] The axis point displacement includes: leading the axis point to the longitudinal wall 3 outside the partial renewal area 30; renewing the partial renewal area 30 of the longitudinal wall 3, and then leading the drawn axis point back to the partial renewal area after renewal, and marking it.

[0115] Specifically, see Figure 16 and Figure 17 Before dismantling the partial replacement area 30 of the longitudinal wall 3, use a total station to direct the axis point to the longitudinal wall 3 outside the partial replacement area 30 corresponding to the tail plate FR0, and record the bow-stern difference Δy and height difference Δz. After the partial replacement area 30 of the longitudinal wall 3 is replaced, return the axis point to the replaced partial replacement area 30 according to the differences Δy and Δz, and mark it. Using the above method, shift axis points A, B, C, and D on the first longitudinal wall 31, second longitudinal wall 32, third longitudinal wall 33, and fourth longitudinal wall 34, respectively, perform replacements on the partial replacement areas 30, and then return the axis points to the replaced areas and mark them.

[0116] S33: Determine the axis line perpendicular to the hull centerline CL.

[0117] According to technical requirements, the four axis points (A, B, C, and D) are located at the same height and on the same straight line (i.e., the axis line), and this straight line (i.e., the axis line) is perpendicular to the hull centerline CL. The hull centerline CL is marked on the deck. In this embodiment, a total station is used to verify whether the axis lines of the four axis points are perpendicular to the hull centerline CL.

[0118] Specifically:

[0119] S331: Mark points P7 and P8 on the hull centerline CL marked on the deck surface. Point P7 is on the FR0 rib. The length of the straight line P7-P8 must be at least 5 times the length of the line connecting the axis points A and B, and the length of the line connecting the axis points C and D.

[0120] S332: Please refer to Figure 18 , set up the total station at point e and point f respectively; the total station is set up at point e, which is on the left side of the hull centerline CL on the hull deck surface, where the axis point A, axis point B, mark point P7, and mark point P8 can be seen; the total station is set up at point f, which is on the right side of the hull centerline CL on the hull deck surface, where the axis point C, axis point D, mark point P7, and mark point P8 can be seen;

[0121] S333: Establish a coordinate system with marked point P7 as the origin, marked point P8 as the X-axis point, and the line passing through origin P7, perpendicular to the line connecting P7 and P8, and parallel to the horizontal plane as the Y-axis. Measure pivot points A, B, C, and D, obtaining coordinates A(xA2, yA2), B(xB2, yB2), C(xC2, yC2), and D(xD2, yD2). The X-axis values ​​of these four pivot points are xA2 = xB2 = xC2 = xD2, indicating that the axis line is perpendicular to the hull centerline.

[0122] S4: Mark the outline of the old hinge 2 on the longitudinal walls 3 at the left and right ends of each hinge 2, and mark a test line. The test line is 100 mm away from the outline.

[0123] In step S4, the outline and inspection line of the old hinge 2 are marked on the longitudinal walls at both ends of each hinge 2. The inspection line has the same shape as the outline and is 100 mm away from the outline. Figure 19 , mark the contour lines and inspection lines at both ends of the two old hinges 2 on the longitudinal walls 3 respectively, that is, the contour lines and inspection lines at both ends of the two old hinges 2 are marked on the first longitudinal wall 31, the second longitudinal wall 32, the third longitudinal wall 33, and the fourth longitudinal wall 34 respectively, as a reference for the installation and positioning of the new hinges 2.

[0124] S5: Remove the old hinge 2.

[0125] Step S5 includes:

[0126] In this embodiment, because the actual size of the new hinge will deviate from the old hinge during the prefabrication process, if the old hinge is directly removed and the new hinge is installed, it may cause the subsequent new hinge to be difficult to position smoothly. Therefore, in this application, the actual size of the new hinge 2 is measured first, and the size of the new hinge 2 is reflected to the position of the old hinge to draw a cutting line, and the old hinge 2 is cut and removed according to the drawn cutting line. For details, please refer to Figure 20 According to the dimensional measurement data of the new hinge 2, the vertical distance H1 from the axis point of the semicircular sleeve 22 of the new hinge 2 to the lower end of the tail sealing plate FR0, the vertical distance H2 from the axis point to the lower end of the FR0+1861 frame, and the length L1 from the axis point to the side of the inclined top plate, according to the actual size of the new hinge, the size of the new hinge 2 is reflected to the position of the old hinge and the cutting line is drawn. Drawing the cutting line means drawing horizontal cutting marking lines towards the side walls at the position of the old hinge, at the lower end of the tail sealing plate FR0, at the lower end of the FR0+1861 frame, and at the edge of the inclined top plate, respectively, to meet the vertical distance H1 from the axis point of the semicircular sleeve 22 of the old hinge 2 to the cutting marking line at the lower end of the tail sealing plate FR0, the vertical distance H2 from the axis point to the cutting marking line at the lower end of the FR0+1861 frame, and the length L1 from the axis point to the cutting marking line at the edge of the inclined top plate. After the cutting line is drawn and confirmed to be correct, the old hinge 2 is cut and removed according to the drawn cutting line.

[0127] S6: Install and position the new hinge 2 so that the axis point of the semicircular sleeve of the new hinge 2 is concentric with the axis point of the semicircular sleeve of the marked old hinge 2, and the outline of the new hinge 2 is aligned with the outline line of the old hinge 2.

[0128] After the new hinge 2 is prefabricated (when the new hinge is prefabricated, the hinge center line L20 is marked on the new hinge) and the old hinge 2 is dismantled, the new hinge 2 is installed and positioned.

[0129] In this embodiment, step S6 includes:

[0130] S61: New hinge 2 installation:

[0131] See also Figure 21 , use a crane to lift the new hinge 2 to a relatively horizontal state, and use a hoist to pull the new hinge 2 in sections from the stern to the bow until the new hinge 2 is aligned with the stern sealing plate FR0 of the hull;

[0132] S62: New joint 2 positioning

[0133] The new hinge 2 is initially pulled into place, the crane hook is released, and precise positioning is performed based on the axis point of the semicircular sleeve 22 of the old hinge 2 and the marked outline of the old hinge 2. Based on the condition that the new hinge 2 and the old hinge 2 have the same external dimensions, the new hinge 2 is initially precisely positioned using the outline of the old hinge 2 marked on the longitudinal walls 3 at the left and right ends of the hinge 2 and the inspection line. Specifically, when positioning the new hinge 2, the axis point of the semicircular sleeve 22 of the new hinge 2 is first located. The method for determining the axis point of the semicircular sleeve 22 of the new hinge 2 refers to step S2, so that the axis point of the semicircular sleeve of the new hinge 2 coincides with the axis point of the old semicircular sleeve; then the outline of the new hinge 2 is precisely positioned so that the outline of the new hinge 2 coincides with the marked outline of the old hinge 2, and the accuracy of the positioning of the new hinge 2 is checked using the inspection line. When positioning the new hinge 2, use tools such as jacks and hoists to perform segmented positioning adjustments.

[0134] Positioning requirements for the new hinge 2: The center of the rotating shaft of the semicircular sleeve of the new hinge 2 coincides with the axis point marked on the longitudinal wall 3, with a deviation of no more than 1mm. When positioning the hinge 2, a coordinate system is also established with the hull centerline CL using a total station. Please refer to Figure 22 , measure the distance from the center line CL20 of the hinge to the center line CL of the hull. The theoretical value of the distance from the center line CL20 of the hinge to the center line CL of the hull is 11250mm. It is required that the actual measured value of the distance from the center line CL20 of the hinge 2 to the center line CL of the hull shall not deviate from the theoretical value by more than 2mm.

[0135] When the new hinge 2 meets the positioning requirements, the code plate is welded at the closing position for positioning and fixing, completing the installation and positioning work of the new hinge 2.

[0136] S7: Install and position the new rocker arm 1.

[0137] After the welding of the new hinge 2 is completed and the new rocker arm 1 is prefabricated in sections (when prefabricating the new rocker arm 1, the new rocker arm 1 is marked with a center line L10 of the new rocker arm 1), the new rocker arm 1 can be installed.

[0138] The method for installing and positioning the new rocker arm 1 includes: marking and determining the rocker arm center inspection line CL10' of the new rocker arm 1 on the hull deck according to the set distance between the rocker arm center line CL10 of the new rocker arm 1 and the hull center line CL, and the distance between the rocker arm center inspection line CL10' of the new rocker arm 1 and the vertical plane where the hull center line CL is located is equal to the set distance between the rocker arm center line CL10 of the new rocker arm 1 and the vertical plane where the hull center line CL is located; symmetrically installing the guide positioning code plate 4 on the rocker arm center inspection line CL10' of the new rocker arm 1; installing and positioning the new rocker arm 1 so that the new rocker arm 1 is snapped into the guide positioning code plate, and the rocker arm center line CL10 of the new rocker arm 1 is aligned with the marked rocker arm center inspection line CL10'.

[0139] Step S7 includes:

[0140] S71: Mark and confirm the rocker arm center inspection line CL10' of the new rocker arm 1 on the hull deck;

[0141] According to engineering requirements, the installation position of the new rocker arm 1 is shifted toward the hull centerline CL compared to the old rocker arm 1, and the distance between the centerline of the new rocker arm 1 and the vertical plane where the hull centerline CL is located is 12000mm.

[0142] See also Figure 23 Set up the total station at point g. On the hull centerline CL marked on the deck, select points P9 and P10. Establish a coordinate system based on the hull centerline CL, with the X-axis aligned with the hull centerline and the Y-axis perpendicular to it. Using point P9 as the origin, measure six points on either side of the hull centerline CL (i.e., points D1, D2, D3, D4, D5, and D6 on one side, and D1', D2', D3', D4', D5', and D6' on the other side). Ensure the absolute Y value of each point is 12,000 mm. Connect the six points on either side of the hull centerline CL and mark them on the deck. This will become the rocker arm center verification line CL10' of the new rocker arm 1, serving as the basis for installation and positioning.

[0143] S72: Install the guide positioning code plate

[0144] See also Figures 24-26, two guide positioning code plates 4 are symmetrically installed on the deck at the FR2 and FR6 ribs of the hull and on both sides of the rocker arm center inspection line L10', to facilitate the lifting and placement of the new rocker arm 1 and rough positioning. Technical requirements for the installation of the guide positioning code plates 4: 1) The thickness of the guide positioning code plates 4 is ≥40mm, and the size is ≥300×500mm (the specific size can be adjusted according to the actual situation on site); 2) When installing the guide positioning code plates 4, the guide positioning code plates 4 are symmetrically installed according to the new rocker arm 1 center inspection line L10', and the distance between the two symmetrically installed guide positioning code plates 4 matches the width of the corresponding position of the new rocker arm 2. The guide positioning code plates 4 are aligned with the frame under the main deck of the hull, and the extension direction of the guide positioning code plates 4 is perpendicular to the rocker arm center inspection line L10'; 3) After the welding of the guide positioning code plates 4 is completed, the code plate welds are visually inspected and PT flaw detection is performed.

[0145] S73: Installation and positioning of new rocker arm 1

[0146] After marking the rocker arm center inspection line CL10' and installing the guide positioning code plate 4, proceed with the installation and positioning of the new rocker arm 1. Ensure that the new rocker arm 1 is smoothly inserted into the guide positioning code plate 4; align the rocker arm center line CL10 of the new rocker arm 1 with the rocker arm center inspection line CL10' drawn on the hull deck, so that the rocker arm center line CL10 and the rocker arm center inspection line CL10' are on the same vertical plane; the vertical distance between the center point of the tail end of the new rocker arm 1 and the center of the ship is 12000mm; install a temporary fixing code plate on the new rocker arm 1 to ensure that the new rocker arm 1 does not shift before installing the rocker arm locker, and then position and fix the new rocker arm 1 to complete the installation and positioning of the new rocker arm 1.

[0147] Compared with the prior art, the installation and positioning method of the jacket launching barge rocker arm and hinged parts of the present invention has good positioning quality and high completion accuracy, both of which meet the design standards and acceptance standards, and efficiently performs the installation and positioning of the replacement of the rocker arm and hinged parts.

[0148] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the spirit of the present invention, and the present invention is intended to encompass such modifications and variations.

Claims

1. A method for installing and positioning a rocker arm and a hinged member of a jacket launching barge, characterized in that: The following steps are involved: Remove the old rocker arm; Mark and determine the hull centerline on the deck surface of the hull; Mark and determine the axis points of the semicircular sleeves of the old hinged parts on the longitudinal walls at both ends of each old hinged part, so that the axis points of the semicircular sleeves of each old hinged part are on the same straight line, and the straight line is perpendicular to the center line of the hull; otherwise, re-mark the axis points; Mark the outline of the old hinge on the longitudinal walls at both ends of each old hinge; Remove the old hinges; Install and position the new hinge so that the axis point of the semicircular sleeve of the new hinge coincides with the axis point of the semicircular sleeve of the marked old hinge, and the outline of the new hinge is aligned with the outline of the old hinge; Install and position the new rocker arm.

2. The method for installing and positioning the rocker arm and hinged parts of a jacket launching barge according to claim 1, characterized in that: The method for marking and determining the hull centerline includes: marking a plurality of hull centerline points on the deck surfaces of a plurality of hull sections of the hull respectively; making the plurality of hull centerline points on the same straight line, otherwise re-marking the plurality of hull centerline points; marking the line connecting the plurality of hull centerline points on the same straight line as the hull centerline.

3. The method for installing and positioning the rocker arm and hinged parts of a jacket launching barge according to claim 1, characterized in that: The method for marking the axis point includes: using a steel ruler to project different positions of the inner surface of the semicircular sleeve of the hinge onto the longitudinal wall, respectively obtaining the projection points and marking them as multiple marking points; using a compass to draw an arc on the longitudinal wall with each marking point as the center of the circle and the radius of the semicircular sleeve of the old hinge as the compass radius; the intersection of the arcs drawn by the multiple marking points is the axis point of the semicircular sleeve of the old hinge, and is marked.

4. The method for installing and positioning the rocker arm and hinged parts of a jacket launching barge according to claim 1, characterized in that: When the longitudinal walls at both ends of the semicircular sleeve of the old hinge need to be partially renewed, and the marked axis point is located in the local renewal area of ​​the longitudinal wall, the method for installing and positioning the rocker arm and hinge of the jacket launching barge also includes: before marking the outline of the old hinge, shifting the axis point; The axis point displacement includes: leading the axis point to the longitudinal wall outside the local renewal area; renewing the local renewal area of ​​the longitudinal wall, and then leading the led axis point back to the local renewal area after renewal, and marking it.

5. The method for installing and positioning the rocker arm and hinged parts of a jacket launching barge according to claim 1, characterized in that: When marking the outline of the old hinge, it also includes marking inspection lines on the longitudinal walls at both ends of each old hinge. The inspection lines and the outline have the same shape and are 100 mm away from the outline.

6. The method for installing and positioning the rocker arm and hinged parts of a jacket launching barge according to claim 1, characterized in that: The method for removing the old hinge comprises: reflecting the size of the new hinge to the position of the old hinge to draw a cutting line, and cutting and removing the old hinge according to the drawn cutting line.

7. The method for installing and positioning the rocker arm and hinged parts of a jacket launching barge according to claim 1, characterized in that: The axis point of the semicircular sleeve of the new hinge is concentric with the axis point of the semicircular sleeve of the old hinge, with a deviation of no more than 1mm.

8. The method for installing and positioning the rocker arm and hinged parts of a jacket launching barge according to claim 1, characterized in that: After installing and positioning the new hinge, it is also necessary to measure the distance from the hinge centerline of the new hinge to the hull centerline. The actual measured value of the distance from the hinge centerline of the new hinge to the hull centerline deviates from the theoretical value by no more than 2 mm.

9. The method for installing and positioning the rocker arm and hinged parts of a jacket launching barge according to claim 1, characterized in that: The method for installing and positioning a new rocker arm includes: marking and determining a rocker center inspection line of the new rocker arm on the deck surface of the hull according to a set distance from the rocker center line of the new rocker arm to the center line of the hull, the distance from the rocker center inspection line of the new rocker arm to the vertical plane where the hull center line is located is equal to the set distance from the rocker center line of the new rocker arm to the vertical plane where the hull center line is located; symmetrically installing a guide positioning code plate on the rocker center inspection line of the new rocker arm; installing and positioning the new rocker arm so that the new rocker arm is inserted into the guide positioning code plate, and the rocker center line of the new rocker arm is aligned with the marked rocker center inspection line.

Images