Method for installing a ship's draft letter

Abstract

The present application belongs to the ship technical field, disclose a ship water gauge installation method, including S1, a plurality of water gauge section is placed on a plurality of pier seat in turn;S2, pre-confirmed height installation line, rib position line position and install rib position outer bottom plate thickness;S3, determine the waterline and rib inspection line and draw line, determine the first sample point on the waterline, and determine the second sample point on the rib inspection line;S4, according to step S3 and utilize total station instrument on the height installation line and the rib position line in step S2 are drawn;S5, confirm the upper and lower installation line of each water gauge, and the water gauge is spot welded, full welding.The present application is installed by ship water gauge installation method, so that the ship can be installed when the section is transported to the outside field and placed, and the water gauge is installed by total station instrument, height installation line, rib position line, waterline, rib inspection line and installation line, which improves the installation precision, so that the water gauge is installed from the total assembly stage in the prior art to the section stage.

Description

Technical Field

[0001] This invention relates to the field of marine technology, and in particular to a method for installing a ship's water level gauge. Background Technology

[0002] Draft gauges, or waterline markings, are a set of numerical markings on the hull plating at the bow, stern, and midships of a ship, used to indicate the ship's draft. They are an important load indicator for vessels. Currently, draft gauge installation is typically carried out during the assembly and loading stages. This not only requires working at heights but also poses risks of damaging existing paint and overlapping work, increasing operational safety risks. Furthermore, the repetitive nature of secondary painting significantly reduces overall work efficiency. Therefore, finding a way to install draft gauges at the section-by-section stage, moving the installation process forward to improve efficiency while avoiding subsequent high-altitude and painting work, is a problem that needs to be solved by those in the field. Summary of the Invention

[0003] The purpose of this invention is to provide a method for installing ship water level gauges, thereby moving the water level gauge installation process forward, improving installation efficiency, and avoiding subsequent high-altitude and touch-up work.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] Methods for installing ship draft gauges, including:

[0006] S1. Place multiple water gauges in sections on multiple piers in sequence;

[0007] S2. Pre-confirm the position of the installation height line, rib line, and the thickness of the outer bottom plate of the installation rib;

[0008] S3. Determine and mark the water line and rib inspection line, determine the first punching point on the water line and the second punching point on the rib inspection line;

[0009] S4. Based on step S3, use a total station to draw the installation line and rib line at the height in step S2.

[0010] S5. Confirm the upper and lower installation lines of each water level gauge, and perform spot welding and full welding on the water level gauge.

[0011] Alternatively, the pier base may be spaced at least 600mm away from the installation area of ​​the water level gauge to allow for clearance.

[0012] Optionally, in step S2, the height installation line and the rib line are pre-confirmed using the "Load Line and Draft Mark Diagram", and the theoretical height of the height installation line is set to h, where h is the distance between the height installation line and the lower surface of the outer bottom plate of the mounting rib.

[0013] Optionally, the thickness of the outer bottom plate of the mounting rib is set to δ, the corrected height of the waterline is set to Z, and the difference between the waterline and the height mounting line is △, and the theoretical height h of the height mounting line satisfies h=Z-△-δ.

[0014] Optionally, the deviation correction range for both the water line and the rib inspection line is ±1mm.

[0015] Optionally, in step S3, the depth of both the first and second punching points is not less than 1.5 mm, and both include two sets of triplets spaced 1000 mm apart.

[0016] Optionally, both the first and second punch points are marked with a marker.

[0017] Optionally, in step S5, the spacing between the upper and lower installation lines of each water gauge character is set to 100mm, with an error range of ±1mm.

[0018] Optionally, after spot welding the water level gauge in step S5, the distance between the lower edge of each water level gauge and the height installation line is measured based on the height installation line to calculate the deviation value. The deviation value must meet the standard of ±1mm before the water level gauge is fully welded.

[0019] Optionally, after ensuring the verticality of the outer plate and longitudinal wall during the mounting and positioning stage, a welding shrinkage allowance is added to the overall assembly section, and the height of the shrinkage allowance is set to L. The thickness of the outer bottom plate of the mounting rib is set to δ. The actual height h0 of the height mounting line is the distance between the height mounting line and the upper surface of the outer bottom plate of the mounting rib. The theoretical height of the height mounting line is set to h, satisfying h=h0+δ. During the pre-welding positioning stage, the positioning height h1 of the height mounting line satisfies h1=h+L.

[0020] The beneficial effects of this invention are:

[0021] This invention utilizes a method for installing ship draft gauges, allowing the gauges to be installed while the ship is being transported to the field in sections. The installation is achieved using a total station, height installation lines, rib lines, waterlines, rib inspection lines, and other installation methods, improving installation accuracy. This method moves the installation of the draft gauges from the assembly stage in existing technologies to the section stage, avoiding subsequent repainting work that damages the existing coating, and eliminating overlapping high-altitude operations. This improves construction safety and efficiency, effectively shortens the ship's docking period, and reduces ship construction costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of step S1 in the ship draft gauge installation method according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of step S2 in the ship water level gauge installation method according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of steps S2 and S3 in the ship water level gauge installation method described in the embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of step S4 in the ship draft gauge installation method described in this embodiment of the invention;

[0026] Figure 5 This is a schematic diagram of step S4 in the ship draft gauge installation method described in this embodiment of the invention;

[0027] Figure 6 This is a schematic diagram of the overall structure of the ship draft gauge installation method according to an embodiment of the present invention;

[0028] Figure 7 This is a top view of the main assembly section in the ship water level gauge installation method described in this embodiment of the invention.

[0029] In the picture:

[0030] 100 - Water gauge section; 200 - Ground; 10 - Water gauge lettering; 20 - Pier base; 11 - Height installation line; 12 - Water line; 121 - First sample punching point; 122 - First marking point; 13 - Rib inspection line; 131 - Second sample punching point; 132 - Second marking point; 14 - Rib position line; 15 - Shrinkage line. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] Draft gauges, or waterline markings, are a set of numerical markings on the hull plating at the bow, stern, and midships of a ship, used to indicate the ship's draft. They are an important load indicator for vessels. Currently, draft gauge installation is typically carried out during the assembly and loading stages. This not only requires working at heights but also poses risks of damaging existing paint and overlapping work, increasing operational safety risks. Furthermore, the repetitive nature of secondary painting significantly reduces overall work efficiency. Therefore, finding a way to install draft gauges at the section-by-section stage, moving the installation process forward to improve efficiency while avoiding subsequent high-altitude and painting work, is a problem that needs to be solved by those in the field.

[0035] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] like Figures 1 to 7 As shown, this embodiment provides a method for installing a ship's draft gauge, including the following steps:

[0037] S1. Place multiple water gauges in sections 100 on multiple piers 20 in sequence;

[0038] S2. Pre-confirm the position of the installation height line 11, the rib line 14, and the thickness of the outer bottom plate of the installation rib;

[0039] S3. Determine and mark the water line 12 and the rib inspection line 13. Determine the first punching point 121 on the water line 12 and the second punching point 131 on the rib inspection line 13.

[0040] S4. Based on step S3 and using a total station, draw the height installation line 11 and the rib line 14 from step S2.

[0041] S5. Confirm the upper and lower installation lines of each water level gauge 10, and perform spot welding and full welding on the water level gauge 10.

[0042] Specifically, in this embodiment, the method of installing the ship's water level gauge allows the water level gauge 10 to be installed when the ship is being transported to the field for placement in sections. The water level gauge 10 is installed using a total station, height installation line 11, rib line 14, waterline 12, rib inspection line 13, and installation line, improving installation accuracy. This moves the installation of the water level gauge 10 from the overall assembly stage in the prior art to the section stage, avoiding subsequent repainting work that damages the paint, and avoiding cross-operation at heights, thus improving construction safety and work efficiency, effectively shortening the ship's docking period, and reducing the ship's construction cost.

[0043] like Figure 1 As shown, specifically, in this embodiment, multiple water level gauge segments 100 are mounted and positioned to form a main assembly, and the main assembly is supported on the ground 200 by multiple piers 20 to facilitate the installation and fixation of multiple water level gauge characters 10 on the water level gauge segments 100. For example, in this embodiment, the installation areas of the piers 20 and the water level gauge characters 10 are spaced at least 600mm apart, and the installation of the piers 20 needs to meet the process requirements for pier placement, thereby avoiding interference with the installation of the water level gauge characters 10 and preventing interference with the marking, installation, and inspection of the water level gauge characters 10.

[0044] like Figure 2 and Figure 3 As shown, in step S2, the height installation line 11 and the rib line 14 are confirmed using the "Load Line and Water Level Mark Diagram," and the theoretical height of the height installation line 11 is set to h, and the thickness of the outer bottom plate of the mounting rib is set to δ. Further, the theoretical height h of the height installation line 11 is the distance between the height installation line 11 and the lower surface of the outer bottom plate of the mounting rib, which includes the thickness δ of the outer bottom plate. Specifically, the height installation line 11 is used to confirm the installation position of the water level mark 10 to ensure the installation accuracy of the water level mark 10.

[0045] like Figure 3 As shown, in step S3 of this embodiment, the positions of the waterline 12 and the rib inspection line 13 are determined by the "Precision Layout Scheme," and the lines are drawn on them. Further, based on the data analysis after the sections are completed, the positions of the waterline 12 and the rib inspection line 13 are corrected, ensuring that the correction deviation is within a tolerance of ±1mm. Then, the first punching point 121 and the second punching point 131 are marked according to requirements. Specifically, in this embodiment, the depth of the first punching point 121 and the second punching point 131 is not less than 1.5mm, and both include two sets of three-point connections spaced 1000mm apart, i.e., "...". Simultaneously, the first punching point 121 and the second punching point 131 must ensure that each point is parallel or perpendicular to the coordinate system of the hull. Further, the outer sides of the first punching point 121 and the second punching point 131 are marked with a marker, such as the first marking point 122 and the second marking point 132, to facilitate locating them in the next process and improve installation efficiency.

[0046] Optionally, in this embodiment, a high-precision total station with a qualified inspection mark is used for measurement to ensure that the height installation line 11 and rib position line 14 required for the installation of the water gauge 10 can be accurately drawn. Specifically, in this embodiment, the height installation line 11 and the water line 12 are parallel to each other and the difference between them is Δ, and the rib position line 14 and the rib inspection line 13 are parallel to each other and the difference between them is 100mm. Figure 3 As shown, the waterline 12 is vertically shifted downwards to obtain the height installation line 11, and the rib inspection line 13 is longitudinally shifted to the left to obtain the rib position line 14. For example, when marking the height installation line 11 and the rib position line 14, it is necessary to refer to the corrected waterline 12 and rib inspection line 13 to ensure the high-precision installation of the subsequent water gauge 10. Specifically, the corrected height of the waterline 12 is set as Z, and the theoretical height h of the height installation line 11 satisfies h = Z - Δ - δ, where the installation reference for h is selected based on the water gauge 10 with the nearest whole meter distance from the waterline 12.

[0047] like Figure 4 As shown, based on the height installation line 11, installation lines are drawn on the upper and lower sides of each water level gauge 10, with the spacing between the upper and lower installation lines set to 100mm, and the error range being ±1mm. If this is not met, it needs to be corrected. (Combined with...) Figure 5 As shown, furthermore, spot welding can only be performed on the water level gauge 10 after the installation line has passed inspection. Optionally, after spot welding the water level gauge 10 in step S5, the distance from the lower edge of each water level gauge 10 to the height installation line 11 is measured using the height installation line 11 as a reference to calculate the deviation value. Only after the deviation value meets the standard of ±1mm can all water level gauge 10 be fully welded to ensure the stable installation of the water level gauge 10. For example, the deviation data can be recorded in the water level gauge inspection table to provide a basis for the subsequent inspection of the water level gauge 10.

[0048] like Figure 6 When positioning the multiple water gauge sections 100 in the front and rear assembly, the rib inspection line 13 of the midship section 100 can be used as a reference to control the distance between the reference lines of adjacent water gauge sections 100 within a deviation of ±1mm, while simultaneously ensuring the straightness of the waterline 12 of adjacent water gauge sections 100. For example, the positions of the rib inspection line 13 and the waterline 12 are determined based on the XYZ axes.

[0049] like Figure 7As shown, in this embodiment, during the entire mounting and positioning stage, after ensuring the verticality of the outer plate and longitudinal wall, welding shrinkage is added to the overall assembly section, and the height h of the height installation line 11 of the water gauge 10 is measured again to control the height of the overall section. Specifically, the height of the shrinkage is set to L, and the thickness of the outer bottom plate of the mounting rib is set to δ. The actual height h0 of the height installation line 11 is the distance between the height installation line 11 and the upper surface of the outer bottom plate of the mounting rib. Therefore, the theoretical height of the height installation line 11 is set to h, satisfying h = h0 + δ. Consequently, the positioning height h1 of the height installation line 11 during the pre-welding positioning stage satisfies h1 = h + L, thereby offsetting other influences during the installation process of the water gauge 10 under the shrinkage setting. Figure 7 As shown, the position of the shrinkage amount is set at the shrinkage line 15.

[0050] In summary, the high-precision total station in this embodiment can measure the rib inspection line 13 and the waterline 12, and delineate the height installation line 11 and the rib position line 14, thereby ensuring the accurate marking of the first punching point 121 and the second punching point 131. Simultaneously, by using the formula: height h of the height installation line 11 = (corrected height Z of the waterline 12) - (difference Δ between the waterline 12 and the height installation line 11) - (thickness δ of the outer base plate of the rib position), the accuracy of the segmented installation can be guaranteed, thus ensuring the installation accuracy of the water gauge 10. Furthermore, by cleverly adding shrinkage allowance during the mounting stage, it can be ensured that during the pre-welding positioning stage, the positioning height h1 of the height installation line 11 is calculated as: h1 = (theoretical height h of the height installation line 11) + (thickness δ of the outer base plate of the rib position) + shrinkage allowance L, thus offsetting factors affecting the installation accuracy of the water gauge 10.

[0051] Therefore, the installation of the water level gauge 10 is controlled by the above formula, which makes the operation simpler and effectively controls the installation accuracy of the water level gauge 10, ensures the installation quality of the water level gauge 10 at each stage, ensures the integrity of the segmented outfitting of the water level gauge 10, reduces subsequent high-altitude operations, improves the integrity and durability of the paint, improves the construction quality, and shortens the ship's docking period.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for installing ship draft gauges, characterized in that, include: S1. Place multiple water gauge sections (100) sequentially on multiple piers (20); S2, Pre-confirm the position of the height installation line (11), the rib line (14) and the thickness of the outer bottom plate of the installation rib; S3. Determine and mark the water line (12) and the rib inspection line (13), determine the first punching point (121) on the water line (12), and determine the second punching point (131) on the rib inspection line (13). S4. According to step S3, use a total station to draw the height installation line (11) and the rib line (14) in step S2. S5. Confirm the upper and lower installation lines of each water gauge character (10), and perform spot welding and full welding on the water gauge character (10); In step S2, the height installation line (11) and the rib line (14) are pre-confirmed by the "Load Line and Water Gauge Mark Diagram", and the theoretical height of the height installation line (11) is set to h, where h is the distance between the height installation line (11) and the lower surface of the outer bottom plate of the mounting rib. The thickness of the outer bottom plate of the mounting rib is set to δ, the corrected height of the water line (12) is set to Z, and the difference between the water line (12) and the height mounting line (11) is △. The theoretical height h of the height mounting line (11) satisfies h=Z-△-δ. In step S3, the depth of the first punch point (121) and the second punch point (131) is not less than 1.5 mm, and both include two sets of three-point connections with a spacing of 1000 mm. In step S5, the spacing between the upper and lower mounting lines of each of the water gauge characters (10) is set to 100mm, with an error range of ±1mm; After ensuring the verticality of the outer plate and longitudinal wall during the mounting and positioning stage, welding shrinkage is added to the overall assembly section, and the height of the shrinkage is set to L. The actual height h0 of the height installation line (11) is the distance between the height installation line (11) and the upper surface of the outer bottom plate of the mounting rib. The theoretical height h of the height installation line (11) satisfies h=h0+δ. During the pre-welding positioning stage, the positioning height h1 of the height installation line (11) satisfies h1=h+L.

2. The method for installing ship draft gauges according to claim 1, characterized in that, The installation areas of the pier base (20) and the water level gauge (10) are spaced at least 600mm apart to avoid collision.

3. The method for installing ship draft gauges according to claim 1, characterized in that, The deviation correction range for both the water line (12) and the rib inspection line (13) is ±1mm.

4. The method for installing ship draft gauges according to claim 1, characterized in that, Markings were made on the outside of both the first punch point (121) and the second punch point (131) using a marker.

5. The method for installing ship draft gauges according to claim 1, characterized in that, After spot welding the water gauge characters (10) in step S5, the distance between the lower edge of each water gauge character (10) and the height installation line (11) is measured to calculate the deviation value, based on the height installation line (11). The deviation value is fully welded to the water gauge characters (10) after the range meets the standard of ±1mm.

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