Ring section displacement method

Abstract

The invention discloses a ring section displacement method. The method sequentially comprises the steps of determining the number and positions of the jacking devices, floating and shifting the shifting ring section to the position close to the reference ring section, measuring the reference ring section, trimming and cutting the allowance, drawing position lines of the jacking devices on the outer bottom plate, arranging the jacking devices in place, grouping the jacking devices to be connected with a console, enabling the shifting ring section to be in a free state, and pre-jacking the jacking devices. The jacking force of the jacking oil pump is increased until the shifting ring section is completely jacked up to be separated from the docking block and the docking block is loosened through knocking, the jacking device is controlled to drive the shifting ring section to be in butt joint with the reference ring section in the Y direction, the jacking device drives the shifting ring section to be in butt joint with the reference ring section in the X direction and the Z direction, the height and levelness of the docking block are adjusted, the shifting ring section is arranged on the docking block, and the jacking device is withdrawn. The stress requirement of the shifting ring section can be met, the butt joint precision of the shifting ring section and the reference ring section is improved, deformation of the shifting ring section is avoided, and the butt joint precision is guaranteed.

Description

Technical Field

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

[0002] In the construction process of large LNG ships, ring segment displacement is usually used to dock the hull section or ring segment. For example, Chinese patent CN110329427A discloses a method for docking hull ring segments, which is characterized in that a plurality of hydraulic trolleys with transverse mechanisms are arranged at the bottom of the docking ring segment and the docked ring segment. The hydraulic trolleys travel along the track and cooperate with the transverse mechanism to realize the translation and small-angle rotation of the ring segment. The small-angle rotation of the ring segment is the difference between the two extension rods generated by the different displacements of the two transverse cylinders of the transverse mechanism, so that the ring segment produces a small-angle rotation around the vertical direction (Z-axis direction). However, in this docking method, the hydraulic trolley needs to move along the track, and the layout of the track is limited 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 limited by the layout of the dock piers at the bottom of the ring segment, that is, the layout of the jacking mechanism is limited by the dock piers, and cannot meet the stress requirements of some parts of the displaced ring segment, especially the chord side, and 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 deformation of the displaced ring segment and affecting the docking accuracy of the ring segment. Summary of the invention

[0003] In view of the defects existing in the prior art, the present application provides a ring segment displacement method to solve the technical problems in the prior art that the arrangement of the jacking mechanism in the hull ring segment docking method 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 gravity of the shifting 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, the baseline and the 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, according to 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 lifting device, so that the lifting device is subjected to a certain lifting force, and check whether the display of the force of each lifting device on the control console display is normal;

[0015] S10, after the pre-lifting inspection is completed, the lifting force is released, and 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 section is completely lifted up and separated from the dock pier, and the height direction of the lifting device is no longer adjusted, and the dock pier pressed at the displacement ring section is knocked loose;

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

[0017] S12, adjusting the coordinates of the displacement ring segment in the X direction and the Z direction by means of the lifting device until the displacement ring segment is butted against the reference ring segment in both the X direction and the Z direction;

[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 displacement of the displacement 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 the 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 floating and displacement 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 end center of the lifting 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 displacement 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 arranges 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 along 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 separately, 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 the moving ring segment drops after the docking, so that the compression 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 It 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 2It is a layout diagram of the docking pier and jacking device of the displaced ring segment in the embodiment of the present application;

[0034] Figure 3 It is a schematic diagram of the grouping of the jacking device of the displaced 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 pier; 7, outer bottom plate; 8, hull centerline. 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] This embodiment provides a ring segment displacement method, such as Figure 1As described, 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 by the ring segment displacement method in this embodiment.

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

[0043] S1. According to the weight center of gravity of the displacement ring segment, the number and arrangement position of the jacking device 5 are determined, and the direction along the length of the ship is defined as the X direction, the direction along the width of the ship is defined as the Y direction, and the vertical direction is defined as the Z direction. The end of the jacking device 5 can be moved 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 end of the jacking device 5 is driven and adjusted by an 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 arrangement position of the jacking device is staggered with the dock pier 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 divided by the safety factor and then divided by the rated load of the jacking device is the estimated number of jacking devices. After the number and position of the jacking devices are arranged, finite element calculation is used to confirm that the load of the jacking device and the structural stress of the displacement ring segment meet the safety requirements.

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

[0046] In this embodiment, the constructed displacement ring segment 1 is floated and displaced to 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 accurately placed when it is placed.

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

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

[0049] S5, according to the arrangement position of the lifting device 5 determined in S1, a position line of the lifting device is drawn on the outer bottom plate of the displacement ring segment.

[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, Y coordinate data of each jacking device, the position line of the bottom of the dock is reversed 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, arranging the lifting device 5 in place according to the position line of the lifting device, such as Figure 2 shown.

[0052] The end center of the lifting device 5 is aligned with the intersection of the cross lines at the bottom of the outer plate of 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 of S5.

[0053] S7, the lifting devices are grouped and connected to the control console. The lifting devices of each group can be operated and controlled individually to accurately and flexibly adjust the moving ring segments.

[0054] like Figure 3 As shown, in this embodiment, the lifting devices are divided into four groups, with two groups on each side of the hull centerline 8, and the number of lifting 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 displacement ring segment, so that the displacement ring segment 1 is in a free state;

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

[0057] S10, after the pre-lifting inspection is completed, the lifting force is released, and the formal lifting begins after the release is complete, 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 50mm. The height direction of the lifting device is no longer adjusted, and the dock pier pressed at the displacement ring segment is knocked loose. After being separated from the dock pier by 50mm, there is space to process the dock pier without wasting too much work 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 direction and the Z direction by means of the jacking device until the displacement ring segment 1 is butted against the reference ring segment in both the X direction and the Z direction.

[0060] By partially adjusting the X- and Z-direction coordinates of the ends of one or two groups of jacking 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 jacking devices in groups, the docking accuracy of the displacement ring segment 1 and the reference ring segment 2 can be improved. In this process, it is necessary to always pay attention to the weight display of each jacking device on the display screen of the control console to avoid excessive force on some jacking devices, resulting in 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 condition 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 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-loose dock, the adjusted dock is more adapted to the linear outer bottom plate 7 of the displaced ring segment after displacement, so that the compression 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 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 ring segment displacement method, characterized in that: The following steps are involved: S1, according to the weight center of gravity of the displacement ring segment, determine the number and arrangement position 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, the Y direction and the Z direction, and the bottom of the jacking device is 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 the 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, according to 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 lifting device, so that the lifting device is subjected to a certain lifting force, and check whether the display of the force of each lifting device on the control console display is normal; S10, after the pre-lifting inspection is completed, the lifting force is released, and 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 section is completely lifted up and separated from the dock pier, and the height direction of the lifting device is no longer adjusted, and the dock pier pressed at the displacement ring section is knocked loose; S11, controlling the lifting device to drive the displacement ring segment to move along the Y direction to exceed the reference ring segment until the displacement ring segment docks with the reference ring segment in the Y direction; S12, adjusting the coordinates of the displacement ring segment in the X direction and the Z direction by means of the lifting device until the displacement ring segment is butted against the reference ring segment in both the X direction and the Z direction; 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 displacement of the displacement 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 the 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, Y coordinate data of each jacking device, the position line of the bottom of the dock is returned 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 end center of the lifting 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 centerline of the hull, and the number of lifting devices in each group is approximately 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 partially adjusted so that the displacement 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 displacement ring segment 1 is completely lifted up and separated from the dock by about 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 a stern ring segment, and the displacement ring segment is a fuel tank ring segment.

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