A method for installing large-scale segmented outer tubes

Abstract

This invention relates to a method for installing a large-scale segmented outboard tube, comprising: Step 1, confirming the coordinates (x1, y1, z1) of the center point of the opening in the segmented outer plate of the outboard tube; Step 2, finding a first cross-section at a distance x1 from the plane containing the Y-axis and Z-axis, and a second cross-section at a distance z1 from the plane containing the X-axis and Y-axis; Step 3, finding the nearest first component in the first cross-section, and the nearest second component in the second cross-section; selecting a reference point on each of the first and second components, and calculating the distance between the reference point and the center point; Step 4, measuring the actual three-dimensional coordinates of the reference points, and determining the actual position of the center point on the segmented outer plate according to the reference points; Step 5, making the opening according to the actual position of the center point, and installing the outboard tube according to the opening position. This invention solves the problem of difficulty in locating the opening of the outboard tube on the outer plate by measuring the positions of the first and second components near the center point within the segment to determine the center point of the opening.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding, specifically to a large-line segmented outboard tube. Background Technology

[0002] In ship hull structures, the function of the outboard drain pipe is to expel water from the hull by extending it out of the hull plating. The outboard drain pipe is located in the side area. During shipbuilding, to improve the integrity of intermediate products, the outboard drain pipe is usually pre-installed in the section stage. The opening position for the outboard drain pipe is located on the outer plating, the opening is made, and then the outboard drain pipe is installed according to the opening position.

[0003] For sections with large outer plate lines, the difficulty in installing the outer hull tube lies in accurately locating the opening position of the outer hull tube on the outer plate. Summary of the Invention

[0004] To address the challenge of locating the opening position of the outer hull tube in sections with large outer plate profiles, this invention provides a method for installing the outer hull tube in large-profile sections. This method achieves precise positioning of the opening position, ensuring accurate installation of the outer hull tube. In addition to accurately positioning the outer hull tube opening in sections with large outer plate profiles, it is also applicable to positioning the outer hull tube opening in sections with small outer plate profiles.

[0005] The technical objective of this invention is achieved through the following technical solution:

[0006] A method for installing large-scale segmented outboard tubes, the method comprising:

[0007] Step 1: According to the section of the outer tube installation drawings, confirm the coordinates (x1, y1, z1) of the center point of the hole on the outer plate of the section in the XYZ three-axis coordinate system. The X-axis of the coordinate system is along the length of the ship, the Y-axis is along the width of the ship, and the Z-axis is along the height of the ship.

[0008] Step 2: In the 3D model of the ship's hull structure, find the first cross-section that is x1 away from the plane containing the Y-axis and Z-axis;

[0009] In the 3D model of the ship's hull structure, find the second cross section that is z1 away from the plane containing the X-axis and Y-axis;

[0010] Step 3: Based on the first cross-section, find the first component on the outer segment plate that is closest to the center point; based on the second cross-section, find the second component on the outer segment plate that is closest to the center point.

[0011] Select a reference point on the first component and the second component respectively, obtain the coordinate position of the reference point on the XYZ three-axis coordinate system from the three-dimensional model of the hull, and calculate the distance between the reference point and the center point respectively.

[0012] Step 4: Measure the actual three-dimensional coordinates of the reference point on the segment, and determine the actual position of the center point on the outer plate of the segment based on the distance between the reference point and the center point;

[0013] Step 5: Drill holes according to the actual position of the center point on the outer plate of the section, and install the outer hull pipe according to the position of the hole.

[0014] Furthermore, in step 5, an initial through hole is first made through the outer plate according to the position of the center point of the segmented outer plate. The diameter of the initial through hole does not exceed 50mm. The position of the initial through hole is re-inspected. After the re-inspection is qualified, the initial through hole is enlarged.

[0015] Furthermore, when enlarging the opening based on the initial through hole, the opening template is made by laying out the opening data of the outer tube at the outer plate. The opening template is attached to the segmented outer plate to determine the outer contour line of the enlarged opening, and the opening is enlarged along the outer contour line.

[0016] Furthermore, when re-verifying the position of the initial through hole, the actual three-dimensional coordinates of the center of the initial through hole are measured, and the actual distance from the center of the initial through hole to the reference point is calculated. If the actual distance from the center of the initial through hole to the reference point is equal to the distance from the center point of the ship's three-dimensional model to the reference point, then the re-verification is qualified.

[0017] Furthermore, when selecting reference points, the positions of edges, centers, included angles, roots, and vertices can be chosen.

[0018] Furthermore, a 1-5mm gap is reserved between the outer hull tube and the edge of the opening. When installing the outer hull tube, the outer hull tube is passed through the opening and then welded and fixed.

[0019] Furthermore, before welding the outer hull tube to the opening, a welding bevel is made at the edge of the opening. After welding, the weld seam of the outer hull tube and the opening is ground and inspected.

[0020] Compared with existing technologies, this invention determines the position of the center point of the opening by measuring the positions of the first and second components near the center point of the opening in the segment. This solves the problem of the difficulty in positioning the opening for the outer tube in the segmented outer plate with a large outer plate shape. It reduces the difficulty of opening positioning and can quickly determine the center of the opening, which is conducive to improving construction efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the first cross-section in an embodiment of the present invention.

[0022] Figure 2 This is a second cross-sectional schematic diagram in an embodiment of the present invention.

[0023] Figure 3This is a schematic diagram showing the distance between the center point and reference point A in the first cross-section in an embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram showing the distance between the center point and reference point B in the second cross-section in an embodiment of the present invention. Detailed Implementation

[0025] The technical solution of the present invention will be further described below with reference to specific embodiments:

[0026] A method for installing large-scale segmented outboard tubes, the method comprising:

[0027] Step 1: According to the section of the outer tube installation drawings, confirm the coordinates (x1, y1, z1) of the center point of the hole on the outer plate of the section in the XYZ three-axis coordinate system. The X-axis of the coordinate system is along the length of the ship, the Y-axis is along the width of the ship, and the Z-axis is along the height of the ship.

[0028] Step 2: In the 3D model of the ship's hull structure, find the first cross-section that is x1 distance from the plane containing the Y-axis and Z-axis, such as... Figure 1 As shown;

[0029] In the 3D model of the ship's hull structure, find the second cross-section that is z1 away from the plane containing both the X and Y axes, such as... Figure 2 As shown.

[0030] Step 3: In the first cross-section, find the first component on segmented outer plate 1 that is closest to the center point. Figure 1 The closest point to the center point is a T-shaped profile located above center point 2. A reference point is selected on this T-shaped profile. The reference point can be selected from the edge, center, included angle, root, or vertex positions. These positional features are obvious and easy to find and measure within the segments. In this embodiment, the lower edge of the panel of the T-shaped profile in the first section is used as the first reference point A, and the coordinates of point A are represented as (x2, y2, z2). The distances d1 and d2 in the Y-axis and Z-axis directions of the center point 2 and reference point A in the hull 3D model are determined by calculation. Figure 3 As shown;

[0031] Based on the second cross-section, find the second component on segmented outer plate 1 that is closest to the center point 2. Figure 2 The closest point to center point 2 is a T-shaped profile to the left of center point 2. A second reference point B is selected at the root of the web of this T-shaped profile, with coordinates (x3, y3, z3). The distances between center point 2 and reference point B in the X-axis and Y-axis directions in the 3D model of the hull are calculated to be d3 and d4, respectively. Figure 4 As shown.

[0032] Step 5: Measure the actual three-dimensional coordinates of the reference point on the segment, and determine the actual position of the center point on the outer plate of the segment based on the distance between the reference point and the center point.

[0033] This embodiment provides two methods:

[0034] The first method involves using a total station to offset the center point along the Y-axis and Z-axis by distances d1 and d2 respectively, with point A as the reference, to obtain the position of the center point along the X-axis on the outer plate; and using a total station to offset the center point along the X-axis and Y-axis by distances d3 and d4 respectively, with point B as the reference, to obtain the position of the center point along the Z-axis on the outer plate. Since the position along the Y-axis is on the outer plate, it does not need to be determined separately.

[0035] The second method involves measuring distances d1 and d2 along the Y-axis and Z-axis directions using a measuring ruler with point A as the reference to obtain the position of the center point along the X-axis on the outer plate; and then measuring distances d3 and d4 along the X-axis and Y-axis directions using a total station with point B as the reference to obtain the position of the center point along the Z-axis on the outer plate.

[0036] Step 6: Drill holes according to the actual position of the center point on the outer plate of the section, and install the outer hull pipe according to the position of the hole.

[0037] More specifically, when drilling holes, an initial through hole is first drilled through the outer plate according to the position of the center point of the segmented outer plate. The diameter of the initial through hole does not exceed 50mm. The position of the initial through hole is re-inspected. After the re-inspection is qualified, the initial through hole is enlarged.

[0038] As a preferred option, to ensure the accuracy of the opening position, the actual three-dimensional coordinates of the center of the initial through hole can be measured when the position of the initial through hole is re-verified before enlarging the opening. The actual distance between the center of the initial through hole and the reference point can be calculated. If the actual distance between the center of the initial through hole and the reference point is equal to the distance between the center point and the reference point in the three-dimensional model of the hull, the re-verification is qualified.

[0039] If the re-inspection fails, the position of the initial through hole can be re-measured and determined. Since the diameter of the initial through hole is relatively small, the re-determined position of the initial through hole and the previously determined position of the initial through hole will eventually be within the range of the enlarged opening.

[0040] When enlarging the opening based on the initial through hole, a pattern for the opening is made by laying out the opening data of the outer tube at the outer plate. The pattern for the opening is set with the same size hole as the initial through hole. The hole of the pattern for the opening is aligned with the initial through hole. The pattern for the opening is attached to the segmented outer plate to determine the outer contour line of the enlarged opening. The opening is enlarged along the outer contour line. A gap of 1-5mm is reserved between the outer tube and the edge of the opening.

[0041] After the hole is made, a welding bevel is made at the edge of the hole. The angle of the welding bevel is 30-45°. The outer pipe is then passed through the hole and welded. After the welding is completed, the weld between the outer pipe and the hole is ground and inspected to avoid welding defects.

[0042] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. Those skilled in the art can make non-inventive modifications to this embodiment as needed after reading this specification, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A method of installing a large-line segmented outrigger pipe, characterized by, The method comprises: Step 1, according to the segmented upper outboard pipe installation drawing, confirming the center point of the hole of the outboard pipe on the segmented plate in the XYZ three-axis coordinate system, the X-axis of the coordinate system is along the ship length direction, the Y-axis of the coordinate system is along the ship width direction, and the Z-axis of the coordinate system is along the ship height direction; Step 2, finding a first section plane in the ship structure three-dimensional model, which is at a distance of x1 from the plane where the Y-axis and the Z-axis are located; finding a second section plane in the ship structure three-dimensional model, which is at a distance of z1 from the plane where the X-axis and the Y-axis are located; Step 3, finding the first component closest to the center point on the segmented plate according to the first section plane, and finding the second component closest to the center point on the segmented plate according to the second section plane; selecting a reference point on the first component and the second component respectively, obtaining the coordinate position of the reference point in the XYZ three-axis coordinate system from the ship three-dimensional model, and calculating the distance between the reference point and the center point respectively; Step 4, measuring the actual three-dimensional coordinates of the reference point on the segmented plate, and determining the actual position of the center point on the segmented plate according to the distance between the reference point and the center point; Step 5, according to the actual position of the center point on the segmented plate, the outboard pipe is installed according to the hole position.

2. A method of installing a large profile segmented transom pipe as claimed in claim 1, wherein, In the step 5, an initial through hole is first provided on the segmented plate according to the position of the center point, the hole diameter of the initial through hole is not more than 50mm, the position of the initial through hole is rechecked, and the initial through hole is expanded after the rechecking is qualified.

3. A method of installing a large profile segmented transom pipe as defined in claim 2, wherein, When the initial through hole is expanded, a hole sample plate is made by lofting according to the hole data of the outboard pipe at the plate, the hole sample plate is attached to the segmented plate to determine the external contour line of the expanded hole, and the expanded hole is made along the external contour line.

4. A method of installing a large profile segmented transom pipe as defined in claim 2, wherein, When the position of the initial through hole is rechecked, the actual three-dimensional coordinates of the center of the initial through hole are measured, the actual distance between the center of the initial through hole and the reference point is calculated, and if the actual distance between the center of the initial through hole and the reference point is equal to the distance between the center point in the ship three-dimensional model and the reference point, the rechecking is qualified.

5. A method of installing a large profile segmented transom pipe as defined in claim 1, wherein, When the reference point is selected, the edge, center, angle, root and vertex position are selected.

6. A method of installing a large profile segmented transom pipe as defined in claim 1, wherein, The outboard pipe and the hole edge are reserved with a gap of 1-5mm, and the outboard pipe is welded and fixed after being inserted into the hole.

7. A method of installing a large profile segmented transom pipe as defined in claim 6, wherein, Before welding the outboard pipe and the hole, a welding groove is provided at the edge of the hole, and the welding seam of the welding position of the outboard pipe and the hole is polished and detected after welding.

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