A ring segment displacement method

Abstract

The application discloses a ring segment displacement method, which comprises the following steps of sequentially determining the number and position of jacking devices, displacing a ring segment to float and displace to the vicinity of a reference ring segment, measuring the reference ring segment, trimming the allowance, drawing the position line of the jacking devices on the outer bottom plate, arranging the jacking devices to the positions, connecting the jacking devices in groups with a control console, making the displacement ring segment in a free state, pre-jacking the jacking devices, increasing the jacking force of a jacking oil pump until the displacement ring segment is completely jacked up to be separated from the dock pier and is knocked loose from the dock pier, controlling the jacking devices to drive the displacement ring segment to be butt-jointed with the reference ring segment in the Y direction, controlling the jacking devices to drive the displacement ring segment to be butt-jointed with the reference ring segment in the X direction and the Z direction, adjusting the height and levelness of the dock pier, making the displacement ring segment to be seated on the pier, and withdrawing the jacking devices. The application can meet the stress requirement of the displacement ring segment, improve the butt-joint precision of the displacement ring segment and the reference ring segment, avoid the deformation of the displacement ring segment, and ensure the butt-joint precision.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and in particular to a ring segment displacement method. Background Art

[0002] During the construction of large LNG ships, ring segment displacement is usually used to dock hull sections or ring segments. For example, Chinese patent CN110329427A discloses a method for docking hull ring segments. The method is characterized in that several hydraulic trolleys equipped with transverse mechanisms are arranged at the bottom of the docking ring segment and the docked ring segment. The hydraulic trolleys travel along tracks and cooperate with the transverse mechanisms to achieve translation and small-angle rotation of the ring segments. The small-angle rotation of the ring segments is caused by the difference between the two extension rods generated by the different displacements of the two transverse cylinders of the transverse mechanism, which causes the ring segments to rotate at a small angle around the vertical direction (Z-axis). However, in this docking method, the hydraulic trolley needs to move along the track, and the layout of the track is restricted by the layout of the dock piers at the bottom of the ring segment. Therefore, the space for the hydraulic trolley to move and operate is restricted by the layout of the dock piers at the bottom of the ring segment, that is, the layout of the jacking mechanism is restricted by the dock piers, which cannot meet the stress requirements of some parts of the displaced ring segment, especially the chord side. In addition, the outer bottom plate of the ring segment, especially the outer bottom plate of the ring segment in the fuel tank area, has a certain linearity, and the dock pier fixed at the bottom of the ring segment has inconsistent compression after the ring segment is seated, causing the displaced ring segment to deform, affecting the docking accuracy of the ring segment. Summary of the Invention

[0003] In response to the defects in the existing technology, the present application provides a ring segment displacement method to solve the technical problems in the existing method of hull ring segment docking that the arrangement of the jacking mechanism is restricted by the dock pier and the compression of the dock pier affects the accuracy of the ring segment docking.

[0004] In order to achieve the purpose of the above invention, the technical solution provided by the present invention is as follows:

[0005] A ring segment displacement method comprises the following steps:

[0006] S1, according to the weight center of the shift ring segment, determine the number and layout of the jacking device, and define the direction along the length of the ship as the X direction, the direction along the width of the ship as the Y direction, and the vertical direction as the Z direction. The end of the jacking device can move along the X direction, Y direction and Z direction, and the bottom of the jacking device is fixed to the bottom of the dock.

[0007] S2, floating and shifting the constructed displaced ring segment to the vicinity of the reference ring segment, and measuring the accuracy data of the center line, baseline, and first butt end face of the displaced ring segment;

[0008] S3, measuring the center line, baseline, and second butt end face accuracy data of the completed reference ring segment;

[0009] S4, trimming the margin of the first butt end surface according to the measurement data of S2 and S3;

[0010] S5, based on the arrangement position of the jacking device determined in S1, draw a position line of the jacking device on the outer bottom plate of the shift ring segment;

[0011] S6, arranging the jacking device in place according to the position line of the jacking device;

[0012] S7, connect the lifting devices to the control console in groups, so that each group of lifting devices can be operated and controlled separately;

[0013] S8, removing the temporary connection of the displaced ring segment to make the displaced ring segment free;

[0014] S9, pre-lift the jacking device to make it subject to a certain jacking force, and check whether the force displayed on each jacking device on the control console display is normal;

[0015] S10, after the pre-lifting inspection is completed, the jacking force is released. After the release is complete, the formal jacking begins, and the jacking force of the jacking oil pump is gradually increased until the shifting ring section is completely lifted and separated from the dock pier. The height direction of the jacking device is no longer adjusted, and the dock pier pressed against the shifting ring section is knocked loose;

[0016] S11, controlling the lifting device to drive the shifted ring segment to move along the Y direction over the reference ring segment until the shifted ring segment docks with the reference ring segment in the Y direction;

[0017] S12, adjusting the coordinates of the shift ring segment in the X and Z directions by means of the lifting device until the shift ring segment is docked with the reference ring segment in both the X and Z directions;

[0018] S13, adjusting the height and levelness of the dock pier loosened in S10 according to the positioning of the shifted ring segment;

[0019] S14, after the dock pier is adjusted, the shifting ring segment is slowly lowered until the shifting ring segment rests on the pier;

[0020] S15, moving the lifting device out of the bottom of the ring segment to complete the shifting of the shifted ring segment.

[0021] In one embodiment, in step S1, the jacking device is arranged at the intersection of the longitudinal and transverse non-curved lines of the hull structure on the displacement ring segment, the arrangement position of the jacking device is staggered with the dock pier of the displacement ring segment, and the entry and exit channels of the jacking device are unobstructed; the jacking device is provided with a safety factor of the rated load, and the number obtained by dividing the weight of the displacement ring segment by the safety factor and then by the rated load of the jacking device is the estimated number of jacking devices.

[0022] In one embodiment, the safety factor is greater than or equal to 1.25, and the end of the jacking device is driven and adjusted by an adjusting cylinder.

[0023] In one embodiment, in step S2, the distance between the displaced ring segment and the reference ring segment after the displaced ring segment is floated and displaced is 50 mm.

[0024] In one embodiment, in step S5, according to the layout position of the jacking device determined in S1, the position line of each jacking device is drawn on the bottom of the dock according to the X and Y coordinate data of each jacking device, the position line of the bottom of the dock is reflected to the outer bottom plate of the corresponding shift ring segment, and a cross-line position line of the jacking device is drawn on the outer bottom plate of the shift ring segment.

[0025] In one embodiment, in step S6, the center of the end of the jacking device is aligned with the intersection of the cross lines at the bottom of the outer plate in S5.

[0026] In one embodiment, in step S7, the lifting devices are divided into four groups, with two groups on each side of the centerline of the hull, and the number of lifting devices in each group is approximately the same.

[0027] In one embodiment, in step S12, the X-direction and Z-direction coordinates of one or two groups of lifting device ends are locally adjusted so that the shift ring segment is docked with the reference ring segment in both the X-direction and the Z-direction.

[0028] In one embodiment, in step S10, after the displaced ring segment is completely lifted up and separated from the dock by about 50 mm, the height direction of the lifting device is no longer adjusted.

[0029] In one embodiment, the reference ring segment is a stern ring segment, and the displacement ring segment is a fuel tank ring segment.

[0030] Compared with the prior art, this application has at least the following beneficial effects:

[0031] The present invention provides a jacking device below the displacement ring segment, the bottom of which is fixed to the bottom of the dock and the ends of which can move in the X, Y and Z directions. The arrangement of the jacking device is less restricted by the arrangement of the dock piers at the bottom of the ring segment, and can meet the stress requirements of some parts of the displacement ring segment, especially the chord side. The present invention divides the jacking device below the displacement ring segment into multiple groups connected to the control console. The jacking device of each group can be operated and controlled individually, and the moving ring segment can be accurately and flexibly adjusted to improve the docking accuracy between the moving ring segment and the reference ring segment. The present invention loosens the dock pier when the moving ring segment is lifted, and adjusts the dock pier height before dropping the pier after the moving ring segment is docked, so that the compression amount of the dock pier is consistent after the ring segment sits on the pier, thereby avoiding deformation of the displacement ring segment and ensuring docking accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a three-dimensional diagram of the structure of the reference ring segment and the shift ring segment in the embodiment of the present application;

[0033] Figure 2This is a layout diagram of the docking pier and jacking device of the shifting ring segment in the embodiment of the present application;

[0034] Figure 3 This is a schematic diagram of the grouping of the jacking device for the shifting ring segment in the embodiment of the present application.

[0035] Figure numerals: 1, displacement ring segment; 2, reference ring segment; 3, first docking end face; 4, second docking end face; 5, jacking device; 6, dock; 7, outer bottom plate; 8, hull centerline. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention is described below using specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts 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. As used in this disclosure and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0038] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be understood to indicate or imply relative importance. These terms are only used to distinguish information of the same type from each other. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information without departing from the scope of this disclosure. 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 communication 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] This embodiment provides a ring segment displacement method, such as Figure 1As described above, in this embodiment, the reference ring segment 2 is the stern ring segment, and the displacement ring segment 1 is the fuel tank ring segment. The displacement ring segment 2 and the reference ring segment 1 are precisely docked through the ring segment displacement method in this embodiment.

[0042] A ring segment displacement method in this embodiment specifically includes the following steps:

[0043] S1. Determine the number and arrangement of the jacking devices 5 according to the weight center of gravity of the shifting ring segment, and define the direction along the length of the ship as the X direction, the direction along the width of the ship as the Y direction, and the vertical direction as the Z direction. The ends of the jacking devices 5 can move along the X direction, the Y direction, and the Z direction. The bottom of the jacking device is fixed to the bottom of the dock, and the ends of the jacking devices 5 are driven and adjusted by the adjusting cylinder.

[0044] In order to avoid deformation of the structure of the displacement ring segment during the jacking process, the jacking device is arranged at the intersection of the longitudinal and transverse non-curved lines of the hull structure on the displacement ring segment. The layout position of the jacking device is staggered with the dock 6 of the displacement ring segment, and the inlet and outlet channels of the jacking device are unobstructed. In order to meet the stress requirements of all parts of the displacement ring segment, when calculating the number of jacking devices 5, the jacking device is provided with a safety factor of the rated load. In this embodiment, the safety factor is greater than or equal to 1.25. The weight of the displacement ring segment is divided by the safety factor and then divided by the rated load of the jacking device to obtain the estimated number of jacking devices. After the number and position of the jacking devices are arranged, finite element calculation is performed to confirm that the load-bearing capacity of the jacking device and the structural stress of the displacement ring segment meet the safety requirements.

[0045] S2, floating and displacing the constructed displacement ring segment 1 to the vicinity of the reference ring segment 2, and measuring the accuracy data of the center line, baseline and first butting end face 3 of the displacement ring segment 1.

[0046] In this embodiment, the constructed displacement ring segment 1 is floated and displaced to a position 50 mm from the reference ring segment 2. In order to reduce the difficulty of on-site construction, the displacement ring segment 1 does not need to be placed precisely when it is placed.

[0047] S3, measuring the accuracy data of the center line, baseline and second butting end face 4 of the completed reference ring segment 2.

[0048] S4, trimming the margin of the first butting end face 3 according to the measurement data of S2 and S3.

[0049] S5 , drawing a position line of the jacking device on the outer bottom plate of the shift ring segment according to the arrangement position of the jacking device 5 determined in S1 .

[0050] According to the layout position of the jacking device 5 determined by S1, the position line of each jacking device is drawn on the bottom of the dock according to the X and Y coordinate data of each jacking device, and the position line of the bottom of the dock is reflected to the outer bottom plate of the corresponding shift ring segment, and a cross-line position line of the jacking device is drawn on the outer bottom plate of the shift ring segment.

[0051] S6, arrange the lifting device 5 in place according to the position line of the lifting device, such as Figure 2 shown.

[0052] The center of the end of the jacking device 5 is aligned with the intersection of the cross lines at the bottom of the outer plate S5. In this embodiment, the center of the adjusting cylinder is aligned with the intersection of the cross lines at the bottom of the outer plate S5.

[0053] S7, the jacking devices are grouped and connected to the control console. The jacking devices of each group can be operated and controlled separately to enable precise and flexible adjustment of the moving ring segments.

[0054] like Figure 3 As shown, in this embodiment, the jacking devices are divided into 4 groups, with two groups on each side of the hull centerline 8. The number of jacking devices in each group is roughly the same, and they are named group a, group b, group c and group d respectively.

[0055] S8, removing the temporary connections around the shift ring segment, so that the shift ring segment 1 is in a free state;

[0056] S9, pre-lift the jacking device, so that the jacking device is subjected to a certain jacking force, but there is no need to lift the ring segment, check whether the force displayed on each jacking device on the control console display is normal. If the force display is abnormal, check the connection line between the jacking device and the control console;

[0057] S10, after the pre-lifting inspection is completed, the lifting force is released. After the release is complete, the formal lifting begins, and the lifting force of the lifting oil pump is gradually increased until the displacement ring segment 1 is completely lifted and separated from the dock pier by about 50 mm. The height direction of the jacking device is no longer adjusted, and the dock pier pressed against the displacement ring segment is knocked loose. 50 mm away from the dock pier means that there is space to handle the dock pier without wasting too much energy to lift the displacement ring segment.

[0058] S11, controlling the lifting device to drive the displacement ring segment 1 to move along the Y direction over the reference ring segment 2 until the displacement ring segment docks with the reference ring segment in the Y direction.

[0059] S12, adjusting the coordinates of the displacement ring segment 1 in the X and Z directions by means of the jacking device until the displacement ring segment 1 is docked with the reference ring segment in both the X and Z directions.

[0060] By locally adjusting the X and Z coordinates of one or two groups of lifting devices, the displacement ring segment 1 can be docked with the reference ring segment 2 in both the X and Z directions. By adjusting the lifting devices in groups, the docking accuracy of the displacement ring segment 1 and the reference ring segment 2 can be improved. During this process, it is necessary to constantly pay attention to the weight display of each lifting device on the control console display to avoid excessive force on some lifting devices, which may cause cylinder explosion and deformation of the hull structure.

[0061] S13, adjusting the height and levelness of the dock pier loosened in S10 according to the positioning of the shifted ring segment.

[0062] S14, after the dock pier is adjusted, the shift ring segment 1 is slowly lowered until the shift ring segment rests on the pier.

[0063] During this process, it is also necessary to always pay attention to the weight display of each jacking device on the control panel display screen to avoid excessive force on some jacking devices, resulting in cylinder explosion and deformation of the hull structure.

[0064] S15, move the lifting device out of the bottom of the ring segment to complete the displacement of the large ring segment.

[0065] By adjusting the height and levelness of the knocked-down dock, the adjusted dock is more adapted to the linear outer bottom plate 7 of the displaced ring segment, so that the compression amount of the dock is consistent after the ring segment is seated, avoiding deformation of the displaced ring segment and ensuring docking accuracy.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to 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 solutions of the present invention. They should all be included in the scope of the technical solutions for which protection is sought in the present invention.

Claims

1. A ring segment displacement method, characterized in that: The following steps are involved: S1. Determine the number and placement of the jacking devices based on the center of gravity of the shifting ring segments. Define the direction along the ship's length as the X direction, the direction along the ship's width as the Y direction, and the vertical direction as the Z direction. The ends of the jacking devices can move in the X, Y, and Z directions, and the bottoms of the jacking devices are fixed to the bottom of the dock. S2, floating and shifting the constructed displaced ring segment to the vicinity of the reference ring segment, and measuring the accuracy data of the center line, baseline, and first butt end face of the displaced ring segment; S3, measuring the center line, baseline, and second butt end face accuracy data of the completed reference ring segment; S4, trimming the margin of the first butt end surface according to the measurement data of S2 and S3; S5, based on the arrangement position of the jacking device determined in S1, draw a position line of the jacking device on the outer bottom plate of the shift ring segment; S6, arranging the jacking device in place according to the position line of the jacking device; S7, connect the lifting devices to the control console in groups, so that each group of lifting devices can be operated and controlled separately; S8, removing the temporary connection of the displaced ring segment to make the displaced ring segment free; S9, pre-lift the jacking device to make it subject to a certain jacking force, and check whether the force displayed on each jacking device on the control console display is normal; S10, after the pre-lifting inspection is completed, the jacking force is released. After the release is complete, the formal jacking begins, and the jacking force of the jacking oil pump is gradually increased until the shifting ring section is completely lifted and separated from the dock pier. The height direction of the jacking device is no longer adjusted, and the dock pier pressed against the shifting ring section is knocked loose; S11, controlling the lifting device to drive the shifted ring segment to move along the Y direction over the reference ring segment until the shifted ring segment docks with the reference ring segment in the Y direction; S12, adjusting the coordinates of the shift ring segment in the X and Z directions by means of the lifting device until the shift ring segment is docked with the reference ring segment in both the X and Z directions; S13, adjusting the height and levelness of the dock pier loosened in S10 according to the positioning of the shifted ring segment; S14, after the dock pier is adjusted, the shifting ring segment is slowly lowered until the shifting ring segment rests on the pier; S15, moving the lifting device out of the bottom of the ring segment to complete the shifting of the shifted ring segment.

2. The ring segment displacement method according to claim 1, characterized in that: In step S1, the jacking device is arranged at the intersection of the longitudinal and transverse non-curved lines of the hull structure on the displacement ring segment. The arrangement position of the jacking device is staggered with the dock pier of the displacement ring segment, and the inlet and outlet channels of the jacking device are unobstructed; the jacking device is provided with a safety factor of the rated load, and the number obtained by dividing the weight of the displacement ring segment by the safety factor and then by the rated load of the jacking device is the estimated number of jacking devices.

3. The ring segment displacement method according to claim 2, characterized in that: The safety factor is greater than or equal to 1.25, and the end of the jacking device is driven and adjusted by an adjusting cylinder.

4. The ring segment displacement method according to claim 1, characterized in that: In step S2, the distance between the displaced ring segment and the reference ring segment after floating and displacement is 50 mm.

5. The ring segment displacement method according to claim 1, characterized in that: In step S5, according to the layout position of the jacking device determined in S1, the position line of each jacking device is drawn on the bottom of the dock according to the X and Y coordinate data of each jacking device, and the position line of the bottom of the dock is reflected to the outer bottom plate of the corresponding shift ring segment, and a cross-line position line of the jacking device is drawn on the outer bottom plate of the shift ring segment.

6. The ring segment displacement method according to claim 5, characterized in that: In step S6, the center of the end of the jacking device is aligned with the intersection of the cross lines at the bottom of the outer plate in S5.

7. The ring segment displacement method according to claim 1, characterized in that: In step S7, the lifting devices are divided into four groups, with two groups on each side of the hull centerline, and the number of lifting devices in each group is the same.

8. The ring segment displacement method according to claim 1, characterized in that: In step S12, the X-direction and Z-direction coordinates of one or two groups of lifting device ends are locally adjusted so that the shift ring segment is docked with the reference ring segment in both the X-direction and the Z-direction.

9. The ring segment displacement method according to claim 1, characterized in that: In step S10, after the displaced ring segment is completely lifted up and separated from the dock by 50 mm, the height direction of the lifting device is no longer adjusted.

10. The ring segment displacement method according to claim 1, characterized in that: The reference ring segment is the stern ring segment, and the displacement ring segment is the fuel tank ring segment.

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