KR20180000838A - Apparatus for inclining test and method of inclining test in harbor - Google Patents

Abstract

The present invention relates to an in-harbor incline testing device and method, including: an accommodating unit (60) installed in a recess (21) formed in seabed (20) and accommodating a thruster (11) of a pontoon (10); a buoy (30) connected to the seabed (20) by a connecting line (32) and positioned above a water surface; a measuring rod (50) connected to the pontoon (10); and a measuring line (40) connecting the buoy (30) and the measuring rod (50), wherein the incline testing method includes executing an incline test of a vessel by using the incline testing device.

Description

[0001] APPARATUS FOR INCLINING TEST AND METHOD OF INCLINING TEST IN HARBOR [0002]

More particularly, the present invention relates to a tilt test apparatus and a tilt test method capable of performing an accurate tilt test regardless of external conditions such as algae and wind.

In general, light weight is the weight of the hull structure in various marine structures including ships, and means the sum of the weight of the hull and the weight of the main engine and various mounted equipments. In this light state, the weight and its center position must be precisely identified because it is a very important factor that plays a decisive role in the restoration performance of the hull structure.

However, various marine structures including ships are constructed to have many members and equipments. Especially, due to difference between design information and actual construction, it has been difficult to calculate accurate weight and its center position. Inclining test method has been developed for grasping the weight and center position of hull structure. In other words, the conventional tilt test was performed at the time when the drying of the hull structure was almost completed, in order to improve the accuracy and reliability of the results, and was calculated using the change of the center of gravity caused by the movement of the heavy object.

The Incline Experiment is performed to identify the weight and center of gravity of the ship being constructed and to ensure that the planned loading capacity and stability at the beginning of the design are properly ensured. This inclination test is not only a contract with the shipowner but also a necessary procedure for the safe operation of the ship. In particular, to evaluate the stability of a ship, the center of gravity of the ship itself must be known. To determine the most important vertical center of gravity (VCG) in the evaluation of stability, a center of gravity is calculated using a varying inclination angle by moving a certain weight to a left / This is called a slope test.

The slope test is a test to check the center of gravity of the ship. Such a slope test is not only a contract with the shipowner but also a necessary procedure for safe operation of the ship. In normal slope tests, the pendulum is placed on the center line of the ship, and the center of gravity of the ship is determined by repeating the measurement of the inclined angle of the pendulum whenever the weight is shifted to the predetermined position of the port and starboard. In order to perform such a tilt test, a tilt test is carried out by placing a heavy object for inducing an outward tilting moment at a prescribed position on the deck left and right sides of the ship. At this time, To the port and starboard, the center of gravity of the ship is obtained through repeated measurement of the inclination angle.

In addition, in the conventional tilt test, each class is required to secure a tilt angle of at least 1 degree (maximum 4 degrees) due to the movement of a heavy object. At this time, the sum of the tentative weight should not exceed 2% of the total light weight have.

An offshore structure such as semi-submersible rigs (Semi-RIG) has a buoyancy control structure called a large pontoon for securing a large buoyancy in the lower part of the water surface, Column, which is equipped with a variety of facilities through the upper platform is equipped with.

Conventionally, the inclination test for a ship is to move the ship to the left / right side of the ship, using a solid shafting weight (block or ballast water), which is installed on a crane or ship installed on the ground The ballast tank or the anti-rolling tank of the ship is used when the ballast water is used.

In addition, since the slope test for the conventional semi-submersible drilling rig must be performed at a deep draft and a thruster of about 5 m height is installed at the lower part of the pontoon, in order to secure the water depth for the actual slope test Yard (Yard) Go to the deep water depth of the outer boundary and I will be forced to perform the slope test.

That is, in order to proceed the slope test with respect to conventional semi-submersible drilling rigs, it is difficult to perform the test in a yard having a limited depth of water, because the test site must be selected in consideration of the deep draft condition and the height of the thruster installed at the lower part of the pontoon, You have to move the test location to a relatively deep yard outside port. As a result, the conventional slanting test for semi-submersible drilling rig involves the following problems. First, at least four tug boats must be supported at all times to move semi-submersible drill ships from the yard to the outer port, as well as to control the mooring facility with the main line to secure semi-submersible drill rigs at specific locations of the outer port. (Mooring Control). At this time, the round trip time and the slope test execution time are required for about two days, and accompanying costs (food expenses, fresh water) such as manpower and fuel consumption are involved. That is, about 70 people (commissioning people) for the semi-submersible drilling rig should be waiting, and accommodation should be provided for the crew during the slope test, A separate tugboat must be operated.

In addition, since the external condition is worse than the yard due to poor environmental conditions (waves, winds, tidal currents, etc.), it may lead to an increase in the overall cost depending on the waiting time and also the reliability of the result of the tilt test may be low. There is a risk of various accidents in the execution of the slope test such as the Draft Reading, the transportation and the movement of the weight, and the support of various materials using the work boats. In addition, it affects the schedule of the field work (Sea Trial and Commissioning), so it is difficult to shorten the air and to set the delivery date.

On the other hand, since the influence of external forces such as algae and wind is smaller in the harbor than in the outer harbor, A more reliable result value can be obtained. However, it is difficult to secure the depth required for the inclination test in the harbor, and in order to secure the depth, dredging in the wall is required, which is very expensive and time consuming.

Accordingly, it is an object of the present invention to provide a tilt test apparatus and a tilt test method capable of performing a tilt test in a harbor with a minimum dredging cost and various apparatuses considering the shape characteristics of semi-submersible drilling rigs.

Korean Patent Publication No. 10-2012-0008623 (2012.02.01) Korean Patent Publication No. 10-2015-0050720 (2015.05.11)

A problem to be solved by the present invention is to provide a tilt test apparatus and a tilt test method capable of securing water depth for a tilt test in a harbor and obtaining accurate tilt test results.

In order to achieve the above object, a harbor inclination checking apparatus of the present invention comprises: a receiving unit installed in a recess formed in a seabed and accommodating a thruster of a pontoon; A buoy connected to the underside by a connecting line and located above the water surface; A metering rod connected to the pontoon; And a measuring line connecting the buoy and the measuring bar. One end of the measurement line may be fixed to the buoy, and the other end of the measurement line may be inserted into the measurement line. And a weight may be further connected to the other end of the measurement line. One end of the metering rod is fixed to the hull and the other end is formed as a free end. The other end of the metering rod is opened, and the metering string can be inserted into the other end of the metering rod. When the pontoons move to the buoy, the weight moves downward to add weight located inside the measuring rod. The harbor inspection apparatus may further include a mesh sheet-shaped cover covering the container.

The tipping test of the present invention is performed by using the above-mentioned tipping test device. The method comprising: a moving step of moving the pontoons to a tilt test performing position, and placing a thruster of the pontoons on top of the receiving unit; A measurement line installation step of installing the measurement line between the buoy and the measurement bar to connect the buoy to the measurement bar; A buoyancy adjusting step of adjusting the buoyancy of the hull so as to conform to an initial condition of the bending test; And a tilt measuring step of measuring the tilt of the hull. The method of testing a tilt in a port may include a position adjusting step of moving the hull to adjust an interval between the buoy and the measuring bar after the moving step; And a buoyancy securing step of securing buoyancy of the hull so as to secure the moving draft of the hull after the inclination measuring step.

According to the present invention, since the inclination test of the ship can be performed in the harbor, the cost required for the test can be greatly reduced by greatly reducing the inclination test cost, the time required for the inclination test, and the manpower required for the test.

In addition, according to the present invention, the stability of a ship can be precisely measured through a tilt test, and the quality of the ship can be improved by reflecting it to the ship.

In addition, in order to secure the required depth for the inclination test in the harbor, a smaller amount of dredging is required than in the conventional dredging, so that the dredging cost is reduced in comparison with the conventional dredging.

1 is a schematic view for explaining a state in which a hull is disposed in a harbor.
2 is a schematic view for explaining the connection state of the measurement line.
3 is a schematic view for explaining the state of engagement between the metering bar and the measuring bar.
4 is a schematic diagram for explaining the connection state between the buoy and the measurement line.
5 is a schematic view for explaining the installation state of the lid.
6 is a plan view of the lid.

In the following description, only parts necessary for understanding the operation according to the embodiment of the present invention will be described, and the description of other parts will be omitted so as not to disturb the gist of the present invention.

Furthermore, the terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary terms, and the inventor should understand the concept of the term The present invention should be construed as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely one preferred embodiment of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.

In this specification, unless otherwise specified, 'lower' means the direction in which gravity acts and 'upper' means the direction opposite to the direction in which gravity acts.

1 is a schematic view for explaining a state in which a hull is disposed in a harbor. 2 is a schematic view for explaining an installation state of the tilt testing apparatus.

Referring to FIGS. 1 and 2, the apparatus for testing a slope according to an embodiment of the present invention includes a buoy 30, a measuring line 40, a measuring rod 50, and a receiving unit 60.

The receiving unit (60) is installed in the recess (21) formed in the seabed (20).

The concave portion (21) is formed by dredging the bottom of the sea floor (20). When the wall of the concave portion 21 is collapsed when the inclination test is performed without providing the accommodation unit 60 in the concave portion 21, the thunderstick 11 is brought into contact with the sea floor 20, There may be a case where the hull 11 is stranded on the seabed 20. A receiving unit 60 is provided in the recess 21 to prevent the wall of the recess 21 from collapsing.

The receiving unit 60 is cylindrical and is formed of steel having corrosion resistance. The lower surface 62 of the receiving unit 60 is in the form of a disk and the side surface 61 of the receiving unit 61 is connected along the circumference of the lower surface 62. In the tilt test, the thruster 11 connected to the pontoon 10 is located inside the receiving unit 60. The height of the side surface 61 of the receiving unit 60 is set such that the height of the thruster 11 from the pontoon 10 to the length of the thruster 11, (C). The diameter of the lower surface 62 of the receiving unit 60 should be set so as to prevent the impaction of the side surface 61 of the receiving unit 60 and the thruster 11.

During the slope test, the pontoon 10 is placed in a free floating state on the seawater. The thruster 11 is located inside the shoe unit 60, in which case the pontoons 10 do not remain fixed due to the influence of algae. That is, during the tilt test, the thruster 11 of the pontoon 10 can move inside the receiving unit 60. [ The diameter of the lower surface 62 of the receiving unit 60 should be larger than the diameter of the thruster 11 in order to prevent the contact of the thruster 11 with the side surface 61 of the receiving unit 60 do.

Since the accommodating unit 60 is disposed at a position corresponding to the thruster 11, the accommodating unit 60 is provided at the same number as at least the thruster 11. For reference, FIG. 1 shows a state in which eight accommodating units 8 corresponding to the eight thruster 11 are installed.

The height and diameter of the receiving unit 60 are set in consideration of the size of the thruster 11 and the conditions of the algae in the harbor.

A metering rod 50 is connected to the upper end of the pontoon 10. One end 52 of the measuring rod 50 is fixed to the upper end of the pontoon 10 and the other end 51 of the opposite end of the end 51 is formed as a free end. That is, the measuring rod 50 may be connected to the upper end of the pontoon 10 in a cantilever fashion. The measuring rod 50 is marked in the longitudinal direction so that the depth at which the measuring rod 50 is locked below the water surface can be confirmed. Since the metering rod 50 is connected to the pontoon 10, the depth and the draft of the pontoon 10 can be confirmed by checking the locked depth of the metering rod 50.

The buoy 30 is located above the water surface 70 and is connected to the seabed 20 by a connecting string 32. The sea bed (20) is provided with a fixing table (33) for connecting the seabed (20) and the connecting line (32). One end of the connecting line 32 is connected to the fixing table 33, and the other end is connected to the buoy 30. The buoy board (30) is located on the water surface (70) by buoyancy and is located vertically above the fixing table (33). Therefore, the position of the fixing table 33 can be grasped from the position of the buoy 30. The position of the receiving unit 60 can be grasped from the position of the buoy 30 outside the water surface 70 by providing the fixing table 33 near the receiving unit 60. [

The measuring line 40 connects the buoy 30 and the measuring rod 50. One end of the measuring line 40 is connected to the buoy 30 and the tartan can be inserted into the inside of the measuring rod 50 so that the measuring line 40 connected to the buoy 30 and the measuring rod 50 The length can vary. The measurement line 40 is marked at every predetermined length, so that the length of the measurement line 40 can be easily grasped. Further, it is possible to easily grasp the distance between the buoy 30 and the measuring rod 50 from the marking displayed on the measuring line 40. The measurement line 40 can be displayed in different colors every predetermined distance.

In the course of the inclination test, the thruster 11 is positioned inside the receiving unit 60, and the collision between the thruster 11 and the side surface 61 of the receiving unit 60 should be prevented . If the length of the buoy 30 and the measuring rod 50 are measured in advance when the thruster 11 contacts the side surface 61 of the receiving unit 60, It becomes an allowable length. Accordingly, during the tilt test, the position of the pontoons 10 should be adjusted so that the length of the measurement line 40 is longer than the minimum allowable length. Meanwhile, in order to accurately grasp the position of the pontoon 10, it is preferable that four or more measuring rods 50 are provided on the pontoon 10. 1, two measuring rods 50 are provided at the right upper portion of FIG. 1, one of the measuring rods 50 is connected to the right-side buoy 30, and the other measuring rods 50 Is connected to the buoy 30 located on the lower side. Likewise, one of the two measuring rods 50 located at the lower left of Fig. 1 is connected to the left side buoy 30, and the other measuring rods 50 are connected to the upper side buoy 30 .

3 is a schematic view for explaining a state of engagement between the measuring rod 40 and the measuring rod 50. Fig.

Referring to FIG. 3, the other end of the measuring line 40 is inserted into the measuring rod 50. A weight 41 is connected to the other end of the measurement line 40 and the other end 51 of the measurement rod 50 is open. The weights 41 of the weighing rods 40 are inserted into the other ends 51 of the weighing rods 50 and can move up and down within the weighing rods 50. [ A tensile force is applied to the measurement line 40 by the weight 41. [ When the pontoon 10 moves toward the buoy 30, the weight 41 located inside the measuring rod 50 moves to the lower side of the measuring rod 50 and the pontoon 10 moves to the buoy 30 , The weight 41 moves to the upper side of the measuring rod. Therefore, the measuring line 40 between the buoy 30 and the measuring rod 50 can maintain a tight state.

The buoy 30 can be moved toward the measuring rod 50 by the tensile force applied to the measuring string 40 by the weight 41. [ This prevents the buoy 30 from moving by connecting the buoy 30 to the harbor fixture before the measurement line 40 is connected between the buoy 30 and the meter bar 50 can do.

4 is a schematic view for explaining the connection state between the buoy 30 and the measurement line 40. As shown in Fig.

4, the buoy 30 includes a concave portion 30a having an open end, and the fixing piece 31 can be inserted into the concave portion 30a in the direction C in FIG. The fixing piece 31 is connected to one end of the measuring line 40 and the fixing piece 31 is inserted into the concave portion 30a of the buoy 30 to thereby connect the buoy 30 and the measuring line 40 . The user can easily connect the measuring line 40 and the buoy 30 by fitting the fixing piece 31 to the recess 30a of the buoy 30 on the water surface 70. [

5 is a schematic view for explaining the installation state of the lid 23. Fig. 6 is a plan view of the lid 23. Fig.

Referring to Figs. 5 and 6, a lid 23 may be installed on the upper portion of the receiving unit 60. Fig. The lid 23 is in the form of a mesh sheet, so that seawater can pass through the lid 23. It is preferable that the lid 23 is made so that it can not pass foreign substances such as gravel or sand. Even if the lid 23 is installed in the receiving unit 60 at a normal time, the seawater can pass through the lid 23 having the mesh and enter the receiving unit 60. The lid 23 can not be easily separated from the receiving unit 60 by the water pressure when the lid 23 is formed of a surface through which seawater can not pass.

The receiving unit 60 is installed in the concave portion 21 of the seabed 20 so that foreign substances such as sand and gravel can enter into the receiving unit 60 due to external environmental conditions such as algae. Tug and other vessels can be operated in the port, and the depression 21 may be collapsed due to the influence of the propeller of these vessels and the influence of algae. When the concave portion 21 is collapsed or the foreign matter continuously invades into the accommodating unit 60, the thruster 11 (see Fig. 2) can be brought into contact with the foreign matter inside the accommodating unit 60 have. In order to prevent such contact, when the inclination test is not performed, a lid 23 is provided on the upper portion of the receiving unit 60 to prevent foreign matter from penetrating into the receiving unit 60. In the case of performing the inclination test of the same kind of nozzle, the position of the recess 21 does not need to be changed. Therefore, the tilt test can be performed using the recess 21 already formed. That is, in the case of performing the inclination test on the other pontoons 10 (see Figs. 1 and 2) of the same type, the existing concave portion 21 can be utilized without forming the additional concave portion 21. The lid 23 is provided on the receiving unit 60 to prevent the foreign object from penetrating into the recess 21 by using the receiving unit 60 to prevent the recess 21 from collapsing.

At the normal time when the tilt test is not performed, the lid 23 can be installed on the upper part of the receiving unit 60 so that the seawater can enter into the receiving unit 60 but the gravel and other obstacles can not enter into the receiving unit 60 . The lid 23 is removed before the tilt test and can be installed above the receiving unit 60 at normal times to facilitate the maintenance of the receiving unit 60 so that the tilt test of the same ship type of other ship can be performed.

The receiving unit (60) includes a fixing portion (24) capable of fixing the lid (23). The lid 23 includes a coupling portion 23b formed at a position corresponding to the fixing portion 24 of the receiving unit 60. [ The engaging portion 23b has a structure in which the engaging piece 25 which can be engaged with the fixing portion 24 can pass through.

Next, with reference to Fig. 2, a description will be given of a method for testing the slope of the harbor.

A recess 21 corresponding to the shape of the receiving unit 20 is formed in the seabed 20 and a receiving unit 60 is provided in the recess 21 in the dredging and setting step. It is possible to install the storage unit 60 only once and to reuse the storage unit 60 that has already been provided for each tilt test of another hull when performing the tilt test on another ship of the same ship type.

In the moving step, the hull, which is the object of the slope test, is moved to the slope test performing position, and the thruster 11 of the pontoon 10 is placed in the upper part of the receiving unit 60. Before the thruster 11 is placed in the receiving unit 60, the thruster 11 must be positioned above the bottom 20 to prevent contact between the thruster 11 and the bottom 20.

In the position adjustment step after the moving step, the pontoon 10 is moved to adjust the distance between the buoy 30 and the measuring rod 50. At this time, the position of the receiving unit 60 and the position of the thruster 11 can be adjusted by adjusting the positions of the buoy 30 and the measuring rod 50. In this step, the pontoons 10 are fine-tuned by pulling lines or the like so that the thruster 11 is located above the central portion of the receiving unit 60.

Next, in the step of installing the measuring rope 40, the measuring rods 40 are provided on the buoys 30 and the measuring rods 50, respectively. One end of the measuring line 40 can be easily connected to the buoy 30 by fitting the fixing piece 31 into the concave portion 30a of the buoy 30. The other end of the measuring line 40 can be easily connected to the measuring rod 50 by inserting the other end of the measuring line 40 into the opened end 51 of the measuring rod 50. [

In the buoyancy control step, the buoyancy of the pontoon 10 is adjusted to match the initial condition of the tilt test. By adjusting the buoyancy of the pontoon 10 and increasing the draft of the hull, the thruster 11 enters the receiving unit 60.

In the slope measurement stage, the inclination of the hull is measured. In the process of measuring the inclination of the hull, the pontoon 10 can be displaced from the correct position, so that the position of the pontoon 10 is readjusted by the traction line. The length of the measuring line 40 between the buoy 30 and the measuring rod 50 should be monitored from time to time and the amount of displacement of the forward and aft ends of the hull should be checked at the same time.

In the buoyancy securing step after the inclination measuring step, buoyancy of the pontoon 10 is secured in order to secure the moving draft of the hull. That is, when the pontoons 10 move in a state where the thruster 11 is located in the receiving unit 60, the thruster 11 and the receiving unit 60 may collide with each other. It is necessary to secure the buoyancy of the water tank 10 to ensure a sufficient moving draft. In the buoyancy securing phase, the buoyancy of the celestial body is increased to reduce the draft.

In the measurement line disassembling step, the measurement line 40 provided between the buoy 30 and the measuring rod 50 is removed. The fixing piece 31 connected to the measuring line 40 is separated from the concave portion 30a of the buoy 30 and the weight 41 connected to the measuring line 40 is released from the inside of the measuring rod 50 It is possible to easily separate the measuring line 40 from the buoy 30 and the measuring rod 50.

Finally, the hull is moved to the seashore and the slope test is terminated.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10 pontoon 11 thruster
20 underside 21 concave portion
23 Lid 24 Fixing portion
25 Combination 30 buoy
31 Fixing piece 32 Connecting line
33 fixture 40 measuring line
41 Weight weight 50 Measuring rods
60 receiving unit 70 sleeping

Claims (8)

A receiving unit installed in the recess formed in the seabed and accommodating the thruster of the pontoon;
A buoy connected to the underside by a connecting line and located above the water surface;
A metering rod connected to the pontoon; And
And a metering line connecting the buoy to the metering rod. The method according to claim 1,
One end of the measurement line is fixed to the buoy,
And the other end of the measurement line is inserted into the measurement rod. 3. The method of claim 2,
And a weight is further connected to the other end of the metering line. The method of claim 3,
Wherein one end of the measuring bar is fixed to the hull and the other end is formed as a free end,
And the other end of the measurement rod is opened, and the measurement line is inserted into the other end of the measurement rod. 5. The method of claim 4,
Wherein when the hull is moved to the buoy, the weight moves downward to the weight added inside the measuring rod. 6. The method of claim 5,
And a mesh sheet-shaped lid covering the container. A method for testing an in-port tilt test in which a tilt test is performed using the tilt test apparatus according to claim 5 or 6,
A moving step of moving the pontoons to a tilt test performing position and placing a thruster of the pontoons on top of the receiving unit;
A measurement line installation step of installing the measurement line between the buoy and the measurement bar to connect the buoy to the measurement bar;
A buoyancy adjusting step of adjusting the buoyancy of the hull so as to conform to an initial condition of the bending test; And
And a tilt measuring step of measuring a tilt of the hull. 8. The method of claim 7,
A position adjusting step of moving the hull to adjust an interval between the buoy and the measuring bar after the moving step; And
Further comprising a buoyancy securing step of securing buoyancy of the hull so as to ensure the movement draft of the hull after the inclination measuring step.

Images