Ship floating state measuring method

Abstract

The invention discloses a ship floating state measuring method. A plurality of measuring points fixed with reflective targets are arranged on outer plates of a ship bow and a ship stern in sequence; when the ship is balanced, a datum line parallel to the center line of the ship body is drawn on the dock wall or the ground of the wharf; the method comprises the following steps: arranging two total stations respectively corresponding to a bow and a stern on the ground of a dock wall or a wharf, and establishing a space coordinate system; the total station is used for measuring and recording the distances between all measuring points on the bow and stern sides and the datum line in the Y-axis direction and the Z-axis direction when the ship is in a balanced state; when the floating state of the ship changes, the two total stations start to measure the distances between all measuring points on the bow and stern sides and the datum line in the Y-axis direction and the Z-axis direction in real time, and the current floating state of the ship is analyzed; and judging whether the current working condition operation needs to be stopped and measures are taken to adjust the floating state. The ship floating state measuring method is wide in application range, easy to operate and high in practical application error-tolerant rate, and the feasibility of measuring the ship floating state by the total station is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ship construction, and in particular to a method for measuring the floating state of a ship. Background Art

[0002] During the floating and pier stage of the ship in the dock or the mooring and cable stage of the dock, due to the requirements of various construction conditions, it is necessary to change the distribution of the ship's ballast water and counterweight or the length and tightness of the mooring ropes. The above operations will change the buoyancy of the ship, causing it to tilt, tilt or excessive bow and stern deviation, which may cause the hull outer plate to hit the dock wall, dock pier or dock wall, or even capsize. Therefore, during the above-mentioned operation process, it is necessary to monitor the changes in the ship's buoyancy in real time and adjust the ship's buoyancy in time. The floating state of a ship is usually measured by observation. When observing the heeling state of a ship, a horizontal tube with a scale must be arranged in advance at the lateral position of the ship, and the degree of heel is determined according to the difference between the scale values ​​on the port side and the scale values ​​on the starboard side. When observing the longitudinal inclination of the ship, the draft of the bow and stern outer plate water gauge must be observed, and the reading data has a large error. The floating state of a ship measured by observation has a large error in the reading data, and the equipment that passes through the area where the horizontal tube is placed needs to be removed, which affects the on-site construction. In addition, multiple people are required to take readings at different positions at the same time, resulting in high labor costs.

[0003] The prior art has a method of using a total station to measure the floating state of a ship, such as a large ship attitude monitoring method and a large ship attitude monitoring system disclosed in publication number CN116105675A. However, this monitoring method is only suitable for monitoring the floating state of a ship with only one ship in a dock, and has poor feasibility and low practical application. It also requires four total stations, four data transmission and transmitting devices, and a workstation computer, with high capital investment in equipment and a long preparation time for monitoring. Since the equipment is distributed over a large area and is in an unmanned maintenance state, once equipment damage occurs during the monitoring process, the maintenance time is long and the actual application fault tolerance rate is poor. Summary of the invention

[0004] In view of the defects existing in the prior art, the present application provides a method for measuring the floating state of a ship to solve the technical problems in the prior art of measuring the floating state of a ship by a total station, such as poor feasibility, high cost, long maintenance time, and poor fault tolerance in actual application.

[0005] In order to achieve the purpose of the above invention, the technical solution provided by the present invention is as follows:

[0006] A method for measuring the floating state of a ship comprises the following steps:

[0007] S1. Before the ship floats, changes the loading at the dock, or retracts or releases the mooring rope, set multiple measuring points on the outer plates of the bow and stern, and fix cross reflective targets on the measuring points;

[0008] S2. When the ship is in a balanced state, a reference line is drawn on the dock wall or the ground of the pier, and the reference line is parallel to the centerline of the ship's hull in a balanced state;

[0009] S3. Two total stations are set on the ground of the dock wall or the pier. The two total stations are respectively located at the bow and the stern. The total station on the bow side can measure all the measuring points on the bow outer plate, and the total station on the stern side can measure all the measuring points on the stern outer plate. A spatial coordinate system is established with the position point of one of the total stations on the ground of the dock wall or the pier and the surface where the reference line is located as a reference, and the position point of the same total station as the origin. The direction parallel to the reference line is defined as the X-axis, the direction perpendicular to the reference line is defined as the Y-axis, and the direction perpendicular to the reference surface is defined as the Z-axis;

[0010] S4. Use a total station to measure and record the distances between all measuring points on the bow and stern and the reference line in the Y-axis and Z-axis directions when the ship is in a balanced state;

[0011] S5. The ship is floated, the dock loading is changed, or the mooring rope is retracted and released. The floating state of the ship changes. The two total stations start to measure the distances between all the measuring points on the bow and stern sides and the reference line in the Y-axis and Z-axis directions in real time, and compare them with the distances between the measuring points on the Y-axis and Z-axis directions and the reference line in the equilibrium state of the ship in S4 to analyze the current floating state of the ship.

[0012] S6. Based on the measurement data and floating process requirements, determine whether it is necessary to stop the current working condition and take measures to adjust the floating state.

[0013] In one embodiment, in S1, three measuring points are set on the outer plate of the bow and the stern, the three measuring points defined on the outer plate of the stern are measuring point E, measuring point F, and measuring point G from starboard to port, and the three measuring points on the outer plate of the bow are measuring point, measuring point I, and measuring point J from starboard to port, measuring point F and measuring point I are both set on the centerline of the hull, measuring point E and measuring point G are symmetrically arranged about the centerline of the hull, and measuring point H and measuring point J are symmetrically arranged about the centerline of the hull.

[0014] In one embodiment, three measuring points of the outer plating at the stern are on the same horizontal line, and three measuring points of the outer plating at the bow are on the same horizontal line.

[0015] In one embodiment, the distance between the measuring point in the Y-axis direction and the reference line 3 is the distance between the projection point of the measuring point on the reference plane and the reference line; the distance between the measuring point in the Z-axis direction and the measuring reference line is the distance between the measuring point and the projection point of the measuring point on the reference plane 5.

[0016] In one embodiment, in S4, it is defined that when the ship is in a balanced state, the distance between the measuring point F in the Y-axis direction and the baseline is D1, the distance between the measuring point I in the Y-axis direction and the baseline is D2, the distance between the measuring point H in the Z-axis direction and the baseline is H1, the distance between the measuring point I in the Z-axis direction and the baseline is H2, the distance between the measuring point J in the Z-axis direction and the baseline is H3, the distance between the measuring point G in the Z-axis direction and the baseline is H4, the distance between the measuring point F in the Z-axis direction and the baseline is H5, and the distance between the measuring point E401 in the Z-axis direction and the baseline is H6.

[0017] In one embodiment, in S5, it is defined that when the floating state of the ship changes, the distance between the measuring point F in the Y axis and the baseline is d1, the distance between the measuring point I in the Y axis and the baseline is d2, the distance between the measuring point H in the Z axis and the baseline is h1, the distance between the measuring point I in the Z axis and the baseline is h2, the distance between the measuring point J in the Z axis and the baseline is h3, the distance between the measuring point G in the Z axis and the baseline is h4, the distance between the measuring point F in the Z axis and the baseline is h5, and the distance between the measuring point E in the Z axis and the baseline is h6;

[0018] When the floating state of the ship changes, if h1<h3, it means that the ship rolls to the starboard side, and if h1>h3, it means that the ship rolls to the port side; if h2>H2, it means that the ship has a bow height trim, and if h5>H5, it means that the ship has a stern height trim; when d1<D1, it means that the bow of the ship has deviated toward the dock wall or the pier, and if d2<D2, it means that the stern of the ship has deviated toward the dock wall or the pier.

[0019] In one embodiment, in S6, the ship's heel angle is defined as α, α = arcsin (|h3-h1| / 2 / B), wherein |h3-h1| is the absolute value of the difference between h3 and h1, and B is the distance between the measurement point set on the port or starboard side of the ship and the centerline of the hull; the ship's trim value is defined as T, T = |h5-h2|, wherein |h5-h2| is the absolute value of the difference between h5 and h2; the ship's bow and stern deviation value is defined as C, C = d2-B1-B2, wherein B1 is the half-width of the ship, and B2 is the distance between the reference line 3 and the dock wall or the quay wall of the pier 1;

[0020] If α≤the set heel angle, and at the same time T≤the set ship longitudinal inclination value, and C≥the safe distance between the hull outer plate and the dock wall or pier, the buoyancy of the ship meets the technological requirements for the buoyancy of the ship; if α>the set heel angle or T>the set ship longitudinal inclination value or C<the safe distance between the hull outer plate and the dock wall or pier, the buoyancy of the ship does not meet the technological requirements for the buoyancy of the ship, and the current working condition should be stopped, and the buoyancy of the ship should be adjusted to within the range of the technological requirements to avoid hull collision and personnel safety accidents.

[0021] In one embodiment, the distance between the reference line in S3 and the position point of the total station is more than one meter.

[0022] In one embodiment, the two total stations in S3 are arranged on the same side of the vessel.

[0023] Compared with the prior art, this application has at least the following beneficial effects:

[0024] The ship floating state measurement method of the present invention only requires two total stations to be arranged at the bow and stern of the ship respectively to complete the purpose of monitoring the floating state of the ship. It can be applied to various working conditions of dry docks, floating docks and docks. It is particularly suitable for the current shipbuilding factory docks where multiple ship types are built side by side in a joint construction mode. The equipment capital investment is low, the equipment distribution range is small, and the actual application fault tolerance rate is high, which improves the feasibility and practical application of the total station to measure the floating state of the ship.

[0025] This application designs an auxiliary measurement line. Both total stations use this auxiliary measurement line as a reference benchmark, and establish a spatial coordinate system with the position point of the total station as the origin, thereby ensuring the accuracy of the total station output data. It also discloses a method for converting and adjusting the specific data of the ship's floating state and the three-dimensional coordinates of the total station output data. The operation is simple and the practical application value is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a side view of the ship floating state measurement method in the embodiment of the present application when it is implemented;

[0027] Figure 2 yes Figure 1 A-direction view in the figure;

[0028] Figure 3 yes Figure 1 B view in the figure;

[0029] Figure 4 It is a bird's-eye view of the ship when the ship is in a balanced state;

[0030] Figure 5 It is a top view of the ship with the stern offset;

[0031] Figure 6 This is a schematic diagram of determining the distance between the measuring point and the reference line in the Y-axis and Z-axis directions in an embodiment of the present application;

[0032] Figure 7 is a schematic diagram of the bow side in different floating states in an embodiment of the present application;

[0033] Figure 8 is a schematic diagram of the stern side in different floating states in an embodiment of the present application;

[0034] Fig. 9 It is a schematic diagram of angle calculation when the bow heel is in an embodiment of the present application.

[0035] Figure numerals: 1, ship; 101, bow; 102, stern; 2, total station; 201, position point; 3, reference line; 4, measuring point; 401, measuring point E; 402, measuring point F; 403, measuring point G; 404, measuring point H; 405, measuring point I; 406, measuring point J; 5, reference plane; 6, waterline; 7, dock wall or pier. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0037] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0038] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms and should not be understood as indicating or implying relative importance. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0039] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0040] In order to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings.

[0041] like Figure 1-9The present application provides a method for measuring the floating state of a ship, comprising the following steps:

[0042] S1. Before the ship floats, the dock loading is changed, or the mooring rope is retracted or released, a plurality of measuring points 4 are respectively set on the outer plates of the bow 101 and the stern 102, and a cross reflective target is fixed on the measuring points 4;

[0043] S2. When the ship 1 is in a balanced state, a reference line 3 is drawn on the dock wall or the ground of the pier 1, and the reference line 3 is parallel to the centerline of the hull of the ship 1 in a balanced state;

[0044] S3. Two total stations 2 are set on the ground of the dock wall or the pier 1. The two total stations 2 are respectively located corresponding to the bow 101 and the stern 102. The total station 2 on the bow 101 side can measure all the measuring points on the outer plate of the bow 101, and the total station 2 on the stern 102 side can measure all the measuring points on the outer plate of the stern 102. The position point of one of the total stations 2 on the ground of the dock wall or the pier 1 and the surface where the reference line 3 is located are used as the reference plane 5. Figure 6 As shown, a spatial coordinate system is established with the position point of the same total station 2 as the origin, and the direction parallel to the reference line 3 is defined as the X axis, the direction perpendicular to the reference line 3 is defined as the Y axis, and the direction perpendicular to the reference plane is defined as the Z axis;

[0045] S4, using the point detection function of the measurement mode of the total station system, measure and record the distances between all the measurement points 4 on the bow and stern sides and the reference line 3 in the Y-axis and Z-axis directions when the ship is in a balanced state;

[0046] S5, the ship is floated, the dock loading is changed, or the mooring rope is retracted and released, and the floating state of the ship changes. The two total stations 2 start to measure the distances between all the measuring points on the bow and stern sides and the reference line 3 in the Y-axis and Z-axis directions, and compare them with the distances between the measuring points in the equilibrium state of the ship in S4 and the reference line 3 in the Y-axis and Z-axis directions to analyze the current floating state of the ship;

[0047] S6. Based on the measurement data and floating process requirements, determine whether it is necessary to stop the current working condition and take measures to adjust the floating state.

[0048] like Figure 2 , 3As shown, in S1, three measuring points 4 are set on the outer plates of the bow 101 and the stern 102, the three measuring points defined on the outer plate of the stern 102 are respectively measuring point E401, measuring point F402, and measuring point G403 from starboard to port, the three measuring points on the outer plate of the bow 101 are respectively measuring point H404, measuring point I405, and measuring point J406 from starboard to port, the measuring point F402 and the measuring point I405 are both set on the centerline of the hull, the measuring point E401 and the measuring point G403 are symmetrically arranged about the centerline of the hull, the measuring point H404 and the measuring point J406 are symmetrically arranged about the centerline of the hull, the three measuring points of the outer plate of the stern 102 are on the same horizontal line, and the three measuring points of the outer plate of the bow 101 are on the same horizontal line.

[0049] In order to facilitate the total station to observe the measuring point 4, the distance between the reference line 3 and the position point of the total station 2 is more than one meter, and the two total stations 2 in S3 are arranged on the same side of the ship.

[0050] like Figure 6 As shown, the distance between the measuring point 4 and the reference line 3 in the Y-axis direction is the distance between the projection point of the measuring point 4 on the reference plane 5 and the reference line 3, that is, Figure 6 y1 in the figure; the distance between the measuring point and the measuring reference line 3 in the Z-axis direction is the distance between the measuring point 4 and the projection point of the measuring point 4 on the reference plane 5, that is, Figure 6 The z1 in .

[0051] In S4, it is defined that when the ship is in equilibrium, Figure 4 As shown, the distance between the measuring point F402 and the reference line 3 in the Y-axis direction is D1, and the distance between the measuring point I405 and the reference line 3 in the Y-axis direction is D2. Figure 7 , 8 As shown, the distance between the measuring point H404 and the baseline 3 in the Z-axis direction is H1, the distance between the measuring point I405 and the baseline 3 in the Z-axis direction is H2, the distance between the measuring point J406 and the baseline 3 in the Z-axis direction is H3, the distance between the measuring point G403 and the baseline 3 in the Z-axis direction is H4, the distance between the measuring point F402 and the baseline 3 in the Z-axis direction is H5, and the distance between the measuring point E401 and the baseline 3 in the Z-axis direction is H6.

[0052] In S5, it is defined that when the floating state of the ship changes, Figure 5 As shown, the distance between the measuring point F402 and the reference line 3 in the Y-axis direction is d1, and the distance between the measuring point I405 and the reference line 3 in the Y-axis direction is d2. Figure 7 , 8As shown, the distance between the measuring point H404 and the reference line 3 in the Z axis is h1, the distance between the measuring point I405 and the reference line 3 in the Z axis is h2, the distance between the measuring point J406 and the reference line 3 in the Z axis is h3, the distance between the measuring point G403 and the reference line 3 in the Z axis is h4, the distance between the measuring point F402 and the reference line 3 in the Z axis is h5, and the distance between the measuring point E401 and the reference line 3 in the Z axis is h6. When the floating state of the ship changes, if h1<h3 (such as Figure 6 If h1>h3, it means the ship is heeling to the port side; if h2>H2 (as shown in the second group), it means the ship is heeling to the starboard side; if h1>h3, it means the ship is heeling to the port side; Figure 7 If h5>H5 (as shown in the three groups), it means that the ship has bow height trim. Figure 8 When d1 < D1, it means that the bow 101 is offset toward the dock wall or the pier 7. Figure 5 As shown, if d2<D2, it means that the stern 102 is offset toward the dock wall or the pier 7.

[0053] In S6, the ship's heel angle is defined as α, such as Fig. 9 As shown, α=arcsin(|h3-h1| / 2 / B), where |h3-h1| is the absolute value of the difference between h3 and h1, and B is the distance between the measuring point set on the port or starboard side of the ship and the centerline of the hull; the ship's longitudinal inclination value is defined as T, T=|h5-h2|; the ship's bow and stern deviation value is defined as C, C=d2-B1-B2, where B1 is the half-width of the ship, and B2 is the distance between the reference line 3 and the dock wall or the quay wall of the pier 1.

[0054] The floating process usually requires that the ship's heel angle α does not exceed the set heel angle, the ship's trim value T does not exceed the set ship's trim value, and the ship's bow deflection value is not less than the safe distance between the hull's outer plate and the dock wall or pier. In this embodiment, the floating process requirements are: the heel angle is set to 0.5°, the ship's trim value is set to 0.4% of the designed waterline length L, and the safe distance between the hull's outer plate and the dock wall or pier is 1 meter. If α≤0.5°, and at the same time T≤0.4%L, C≥1, the ship's floating state meets the ship's floating state process requirements; if α>0.5° or T>0.4%L or C<1, the ship's floating state does not meet the ship's floating state process requirements, then the current working condition should be stopped, and the ship's floating state should be adjusted to the process requirements by adjusting the loading distribution or the length of the loose cable to avoid hull collisions and personnel safety accidents.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A method for measuring the floating state of a ship, characterized in that: The following steps are involved: S1. Before the ship floats, changes the loading at the dock, or retracts or releases the mooring rope, set multiple measuring points on the outer plates of the bow and stern, and fix cross reflective targets on the measuring points; S2. When the ship is in a balanced state, a reference line is drawn on the dock wall or the ground of the pier, and the reference line is parallel to the centerline of the ship's hull in a balanced state; S3. Two total stations are set on the ground of the dock wall or the pier. The two total stations are respectively located at the bow and the stern. The total station on the bow side can measure all the measuring points on the bow outer plate, and the total station on the stern side can measure all the measuring points on the stern outer plate. A spatial coordinate system is established with the position point of one of the total stations on the ground of the dock wall or the pier and the surface where the reference line is located as a reference, and the position point of the same total station as the origin. The direction parallel to the reference line is defined as the X-axis, the direction perpendicular to the reference line is defined as the Y-axis, and the direction perpendicular to the reference surface is defined as the Z-axis; S4. Use a total station to measure and record the distances between all measuring points on the bow and stern and the reference line in the Y-axis and Z-axis directions when the ship is in a balanced state; S5. The ship is floated, the dock loading is changed, or the mooring rope is retracted and released. The floating state of the ship changes. The two total stations start to measure the distances between all the measuring points on the bow and stern sides and the reference line in the Y-axis and Z-axis directions in real time, and compare them with the distances between the measuring points on the Y-axis and Z-axis directions and the reference line in the equilibrium state of the ship in S4 to analyze the current floating state of the ship. S6. Based on the measurement data and floating process requirements, determine whether it is necessary to stop the current working condition and take measures to adjust the floating state.

2. The ship floating state measurement method according to claim 1, characterized in that: In S1, three measuring points are set on the outer plates of the bow and stern. The three measuring points defined on the outer plate of the stern are measuring point E, measuring point F, and measuring point G from the starboard side to the port side, and the three measuring points on the outer plate of the bow are measuring point, measuring point I, and measuring point J from the starboard side to the port side. Measuring point F and measuring point I are both set on the centerline of the hull, measuring point E and measuring point G are symmetrically set about the centerline of the hull, and measuring point H and measuring point J are symmetrically set about the centerline of the hull.

3. The ship floating state measurement method according to claim 2, characterized in that: The three measuring points of the outer plating at the stern are on the same horizontal line, and the three measuring points of the outer plating at the bow are on the same horizontal line.

4. The ship floating state measurement method according to claim 2, characterized in that: The distance between the measuring point in the Y-axis direction and the reference line 3 is the distance between the projection point of the measuring point on the reference plane and the reference line; the distance between the measuring point in the Z-axis direction and the measuring reference line is the distance between the measuring point and the projection point of the measuring point on the reference plane.

5. The ship floating state measurement method according to claim 4, characterized in that: In S4, it is defined that when the ship is in equilibrium state, the distance between the measuring point F in the Y-axis direction and the baseline is D1, the distance between the measuring point I in the Y-axis direction and the baseline is D2, the distance between the measuring point H in the Z-axis direction and the baseline is H1, the distance between the measuring point I in the Z-axis direction and the baseline is H2, the distance between the measuring point J in the Z-axis direction and the baseline is H3, the distance between the measuring point G in the Z-axis direction and the baseline is H4, the distance between the measuring point F in the Z-axis direction and the baseline is H5, and the distance between the measuring point E401 in the Z-axis direction and the baseline is H6.

6. The ship floating state measurement method according to claim 5, characterized in that: In S5, it is defined that when the floating state of the ship changes, the distance between the measuring point F in the Y axis and the baseline is d1, the distance between the measuring point I in the Y axis and the baseline is d2, the distance between the measuring point H in the Z axis and the baseline is h1, the distance between the measuring point I in the Z axis and the baseline is h2, the distance between the measuring point J in the Z axis and the baseline is h3, the distance between the measuring point G in the Z axis and the baseline is h4, the distance between the measuring point F in the Z axis and the baseline is h5, and the distance between the measuring point E in the Z axis and the baseline is h6; When the floating state of the ship changes, if h1<h3, it means that the ship rolls to the starboard side, and if h1>h3, it means that the ship rolls to the port side; if h2>H2, it means that the ship has a bow height trim, and if h5>H5, it means that the ship has a stern height trim; when d1<D1, it means that the bow of the ship has deviated toward the dock wall or the pier, and if d2<D2, it means that the stern of the ship has deviated toward the dock wall or the pier.

7. The method for measuring the floating state of a ship according to claim 6, characterized in that: In S6, the ship's heel angle is defined as α, α = arcsin (|h3-h1| / 2 / B), where |h3-h1| is the absolute value of the difference between h3 and h1, and B is the distance between the measurement point set on the port or starboard side of the ship and the centerline of the hull; the ship's trim value is defined as T, T = |h5-h2|, where |h5-h2| is the absolute value of the difference between h5 and h2; the ship's bow and stern deviation value is defined as C, C = d2-B1-B2, where B1 is the half-width of the ship, and B2 is the distance between the reference line 3 and the dock wall or the quay wall of the pier 1; If α≤the set heel angle, and at the same time T≤the set ship longitudinal inclination value, and C≥the safe distance between the hull outer plate and the dock wall or pier, the buoyancy of the ship meets the technological requirements for the buoyancy of the ship; if α>the set heel angle or T>the set ship longitudinal inclination value or C<the safe distance between the hull outer plate and the dock wall or pier, the buoyancy of the ship does not meet the technological requirements for the buoyancy of the ship, and the current working condition should be stopped, and the buoyancy of the ship should be adjusted to within the range of the technological requirements to avoid hull collision and personnel safety accidents.

8. The method for measuring the floating state of a ship according to claim 7, characterized in that: The set heel angle is 0.5°, the set ship trim value is 0.4%L, L is the designed waterline length of the ship, and the safe distance between the hull outer plate and the dock wall or pier is one meter.

9. The ship floating state measurement method according to claim 1, characterized in that: The distance between the baseline and the location point of the total station in S3 is more than one meter.

10. The ship floating state measurement method according to claim 1, characterized in that: In S3, two total stations are set up on the same side of the ship.

Images