A method for measuring the main dimensions of a ship in a dock
By using reflective light targets and total stations to draw reference lines in the ship dock room, combined with three-dimensional coordinate data, the problem of low measurement accuracy and efficiency of the ship's main scale is solved, and a fast and accurate measurement effect is achieved.
Patent Information
- Application Number
- CN202210792578.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-07-07
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2042-07-07
AI Technical Summary
During the construction process of ship docks, existing measurement methods lead to poor measurement accuracy and low efficiency, and excessively high elevation angle of instrument measurement, resulting in data errors and the inability to accurately measure the main scale of the ship.
Set up a reflective light target and a total station in the ship dock room. Use the total station to draw multiple front and rear reference lines and width reference lines at the top of the dock wall. The main scale of the ship is obtained through three-dimensional coordinate data, combining the keel pier and the reference point in the middle of the dock wall. , realize accurate measurement.
It improves measurement efficiency and accuracy, shortens the measurement cycle, and can quickly and accurately measure a variety of ship main scales, which is convenient and fast, and reduces data errors.
Smart Images
Figure CN115235338B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of ship design and construction, and in particular relates to a method for measuring the main dimensions of a ship during the construction process in a ship dock. Background Art
[0002] When a shipyard builds a ship in a dock, the measurement of the main dimensions of the ship is one of the last important tasks of the dock's precision work. The current measurement method of the dock bottom oil block line is not effective, with low measurement efficiency, poor accuracy caused by the instrument measuring too high an elevation angle, and a long measurement cycle, which leads to data errors. Therefore, it is necessary to take necessary measures to draw an auxiliary width reference line on the upper plane of the dock walls on both sides of the dock to measure the main dimension related data of the ship. Summary of the invention
[0003] In order to solve the above problems, the present invention provides a method for measuring the main dimensions of a ship in a dock, and the technical solution adopted is:
[0004] A method for measuring the main dimensions of a ship in a dock, wherein the ship is located in a dock room of the dock, a keel pier is arranged at the bottom of the dock room, the ship is placed on the keel pier, the center axis of the ship coincides with the center line of the dock room ground, and dock walls are arranged on both sides of the dock room. The specific steps of measuring the main dimensions of the ship are as follows:
[0005] S1: Reflection light targets are set at the bow end, stern end, port and starboard sides of the middle of the hull of the ship. The positions of the port and starboard reflection light targets are also the ship width points.
[0006] S2: Place the total station at any position where the stern rudder and the top surface of the dock wall can be observed. Use the total station to draw multiple front and rear reference lines at equal intervals on the top surface of the dock wall on both sides. The front and rear reference lines are short line segments parallel to the center of the stern rudder of the ship.
[0007] A width reference line is drawn between adjacent front and rear reference lines, and the center where the ends of the width reference line coincide with the ends of the front and rear reference lines forms a reference point.
[0008] S3: Use the total station to establish each reference point, obtain the three-dimensional coordinate data of each reference point, as well as the distance value of the reference point located in the middle of the dock wall from the port and starboard reflected light targets, and the distance value of the reference point located at both ends of the dock wall from the bow end and the stern end; then obtain the three-dimensional coordinates of the reflected light targets set at the bow end, stern end, port side and starboard side.
[0009] S4: Use the total station to horizontally transfer the average value of the height baseline of the center of the outer bottom of the hull to form a height reference point, and draw the height reference point on the keel pier. There is a height reference point on each side of the keel pier. The height reference point is drawn at a position that can be clearly seen when the total station is set up on the top of the dock wall.
[0010] S5: Use the total station to build the height reference point and obtain the three-dimensional coordinates of the height reference point. The ship width point and the ship depth point are the same point. The three-dimensional coordinates of the ship width point are combined with the three-dimensional coordinates of the dock bottom height reference point to obtain the ship depth height value.
[0011] S6: Use the total station to convert the three-dimensional coordinates obtained in S3 and S5 to obtain the main scale values of the ship. The three-dimensional coordinates of the ship's bow and stern reflection light targets in S3 can be converted to the ship's length value, the three-dimensional coordinates of the ship's port and starboard reflection light targets can be converted to the ship's width value, and the three-dimensional coordinates of the height reference point and the ship's depth point in S5 can be converted to the ship's height value.
[0012] In the above method for measuring the main dimensions of a ship in a dock, further, the distance between the width reference line and the stern rudder center and the bow vertical center is an arbitrary integer.
[0013] In the above method for measuring the main dimensions of a ship in a dock, further, the width of the width reference line is equal to or greater than or less than the width of the front and rear reference lines.
[0014] In the above method for measuring the main dimensions of a ship in a dock, further, the distance between the center of the width reference line and the center of the adjacent front and rear reference lines is 100 meters.
[0015] The above-mentioned method for measuring the main dimensions of a ship in a dock, further, in step S2, a front and rear reference line parallel to the center of the ship's stern rudder is drawn at the top of the dock walls on both sides using a total station, and the front and rear reference lines are continued to be drawn along this front and rear reference line toward the bow of the ship, there is a spacing between adjacent front and rear reference lines, and the last front and rear reference line is parallel to the center of the bow vertical.
[0016] The above method for measuring the main dimensions of a ship in a dock further comprises the following steps: the ship's width point is located at the outermost side of the upper deck at the center of the ship's length, that is, the positions of the port and starboard reflected light targets are located at the outermost side of the upper deck at the center of the ship's length.
[0017] The present invention aims at the requirement of accurate and convenient measurement of the main dimensions of ships under construction in a dock. By drawing a reference line on the top of the dock wall, the invention achieves the effect of rapid measurement, improved measurement efficiency and precise measurement. Moreover, this method of drawing the reference line can measure a variety of ships, which is convenient and fast and shortens the measurement cycle. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a top view schematic diagram;
[0019] Figure 2 is a schematic side view;
[0020] Figure 3It is the reference point formed by the intersection of the front and rear reference lines and the width reference line.
[0021] Among them: 1-reflective light target, 2-front and rear reference lines, 3-width reference line, 4-total station, 5-height reference point, 6-dock room, 7-reference point. DETAILED DESCRIPTION
[0022] The present invention will be further described in conjunction with the accompanying drawings.
[0023] A method for measuring the main dimensions of a ship in a dock, wherein the ship is located in a dock room of the dock, a keel pier is arranged at the bottom of the dock room, the ship is placed on the keel pier, the center axis of the ship coincides with the center line of the floor of the dock room, dock walls are arranged on both sides of the dock room, and the main dimensions of the ship are measured in the dock room, the main dimensions of the ship include the total length of the hull, the length between two columns, the molded depth and molded width of the hull, and the specific steps of measuring the main dimensions of the ship are as follows:
[0024] S1: Figure 1 As shown in the figure, reflected light targets are set at the bow end, stern end, port and starboard of the middle of the hull of the ship. The position points of the port and starboard reflected light targets are also the ship's width points. The ship's width points are located at the outermost side of the upper deck at the center of the ship's length, that is, the positions of the port and starboard reflected light targets are located at the outermost side of the upper deck at the center of the ship's length. The points where the bow end, stern end, port and starboard reflected light targets are located are also the actual points to be measured, that is, the measured points. The actual ship length is measured using the reflected light targets at the bow end and stern end, and the ship's width is measured using the reflected light targets set at the port and starboard. The reflected light targets on the port and starboard sides are both set close to the sea surface on the port and starboard sides of the ship.
[0025] S2: Place the total station at any position where the stern rudder and the top surface of the dock wall can be observed, and use the total station to draw multiple front and rear reference lines at equal intervals on the top surface of the dock walls on both sides. The front and rear reference lines are short line segments parallel to the center of the stern rudder of the ship. Use the total station to draw the first front and rear reference line parallel to the center of the stern rudder of the ship on the top of the dock walls on both sides. Starting from the first front and rear reference line, continue to draw front and rear reference lines toward the bow of the ship. There is a gap between adjacent front and rear reference lines, and the last front and rear reference line is parallel to the center of the bow vertical.
[0026] Draw a width reference line between adjacent front and rear reference lines. The end of the width reference line intersects with the end of the front and rear reference lines to form a reference point. Figure 3 As shown. The distance between the width reference line and the stern rudder center and the bow vertical center is an arbitrary integer to facilitate subsequent measurement and calculation. The width of the width reference line can be the same as or different from the width of the front and rear reference lines. When the width of the width reference line is the same as the width of the front and rear reference lines, the center point of the intersection formed by the intersection of the two is taken as the reference point.
[0027] S3: Use the total station to establish each reference point, obtain the three-dimensional coordinate data of each reference point, as well as the distance value of the reference point located in the middle of the dock wall from the port and starboard reflected light targets, and the distance value of the reference point located at both ends of the dock wall from the bow end and the stern end; then obtain the three-dimensional coordinates of the reflected light targets set at the bow end, stern end, port side and starboard side.
[0028] S4: Measure the average height of the center height baseline of the hull outer bottom, use the total station to horizontally transfer the average value of the center height baseline of the hull outer bottom to form a height reference point, and draw the height reference point on the keel pier, draw a height reference point on each side of the keel pier, and draw the height reference point at a position that can be clearly seen when the total station is set up on the top of the dock wall. Use the height reference point to measure the ship's molded depth.
[0029] S5: The ship width data and the three-dimensional coordinates of the ship width point are measured by the reflective light targets set on the port and starboard sides. The ship depth point is located at the outermost theoretical line of the upper deck. The ship width point and the ship depth point are the same point. The three-dimensional coordinates of the ship width point are combined with the three-dimensional coordinates of the dock bottom height reference point, and converted within the total station system to obtain the ship depth height value. The ship depth data is calculated using the center baseline height value of the hull outer bottom. The ship width point is the measurement point for measuring the ship width, and the ship depth point is the measurement point for measuring the ship depth. The ship width point and the ship depth point are the same point, which is convenient for the subsequent conversion calculation of the width point to the depth point.
[0030] S6: Use the total station to convert the three-dimensional coordinates obtained in S3 and S5 to obtain the main scale values of the ship. The three-dimensional coordinates of the ship's bow and stern reflection light targets in S3 can be converted to the ship's length value, the three-dimensional coordinates of the ship's port and starboard reflection light targets can be converted to the ship's width value, and the three-dimensional coordinates of the height reference point and the ship's depth point in S5 can be converted to the ship's height value.
[0031] The present invention aims at the requirement of accurate and convenient measurement of the main dimensions of ships under construction in a dock. The method of drawing a reference line on the top of the dock wall can achieve the effect of rapid measurement, improved measurement efficiency and precise measurement. In addition, this method of drawing the reference line can establish a permanent three-dimensional coordinate system on the dock wall, and the baseline column can be permanently retained. It can measure a variety of ships, which is convenient and fast and shortens the measurement cycle.
Claims
1. A method for measuring the main dimensions of a ship in a dock, characterized in that: The ship is located in the dock room of the dock. A keel pier is set at the bottom of the dock room. The ship is placed on the keel pier. The center axis of the ship coincides with the center line of the dock room floor. There are dock walls on both sides of the dock room. The specific steps for measuring the main dimensions of the ship are as follows: S1: Set reflection light targets at the bow end, stern end, port and starboard sides of the middle of the hull of the ship. The positions of the port and starboard reflection light targets are also the ship width points. S2: Place the total station at any position where the stern rudder and the top surface of the dock wall can be observed, and use the total station to draw multiple front and rear reference lines at equal intervals on the top surface of the dock wall on both sides. The front and rear reference lines are short line segments parallel to the center of the stern rudder of the ship; A width reference line is drawn between adjacent front and rear reference lines, and the center where the ends of the width reference line coincide with the ends of the front and rear reference lines forms a reference point; S3: Use a total station to establish stations for each reference point, obtain the three-dimensional coordinate data of each reference point, as well as the distance values of the reference point located in the middle of the dock wall from the port and starboard reflection light targets, and the distance values of the reference points located at both ends of the dock wall from the bow end and the stern end of the ship; and then obtain the three-dimensional coordinates of the reflection light targets set at the bow end, the stern end, the port side, and the starboard side; S4: Use the total station to horizontally transfer the average value of the height baseline of the center of the hull bottom to form a height reference point, and draw the height reference point on the keel pier. There is a height reference point on each side of the keel pier. The height reference point is drawn at a position that can be clearly seen when the total station is set up on the top of the dock wall; S5: Use the total station to establish the height reference point to obtain the three-dimensional coordinates of the height reference point. The ship width point and the ship depth point are the same point. The three-dimensional coordinates of the ship width point are combined with the three-dimensional coordinates of the dock bottom height reference point to obtain the ship depth height value; S6: Use the total station to convert the three-dimensional coordinates obtained in S3 and S5 to obtain the main scale values of the ship.
2. A method for measuring the main dimensions of a ship in a dock according to claim 1, characterized in that: The distance between the width reference line and the stern rudder center and the bow vertical center is an arbitrary integer.
3. The method for measuring the main dimensions of a ship in a dock according to claim 1, characterized in that: Width The width of the baseline is equal to, greater than, or less than the width of the front and back baselines.
4. A method for measuring the main dimensions of a ship in a dock according to claim 1, characterized in that: The distance between the center of the width reference line and the center of the adjacent front and rear reference lines is 100 meters.
5. The method for measuring the main dimensions of a ship in a dock according to claim 1, characterized in that: In step S2, a front and rear reference line parallel to the center of the ship's stern rudder is drawn at the top of the dock walls on both sides using a total station, and front and rear reference lines are continued to be drawn along this front and rear reference line toward the bow of the ship. There is a gap between adjacent front and rear reference lines, and the last front and rear reference line is parallel to the center of the bow vertical.
6. The method for measuring the main dimensions of a ship in a dock according to claim 1, characterized in that: The ship's width point is located at the outermost side of the upper deck at the center of the ship's captain, that is, the positions of the port and starboard reflected light targets are located at the outermost side of the upper deck at the center of the ship's captain.