A method for installing LNG ship side process holes in sections

Abstract

The present invention discloses a method for installing a segmented process hole on the side of an LNG ship, which method connects the segmented process hole on the side of the LNG ship with a cantilever platform as a whole, adjusts the center of gravity of the whole connected between the segmented process hole on the side of the LNG ship and the cantilever platform, and then installs the segmented process hole on the side of the LNG ship on the side of the side of the side of the LNG ship to complete the installation of the segmented process hole on the side of the LNG ship. The method of the present invention connects and fixes the cantilever platform with the segmented process hole on the side of the LNG ship, and by hoisting the cantilever platform, the segmented process hole on the side of the side of the LNG ship is stably installed in the process hole without tilting, thereby improving the installation efficiency and shortening the construction period.

Description

Technical Field

[0001] The invention relates to the field of shipbuilding, and in particular to a method for installing segmented process holes on the side of an LNG ship. Background Art

[0002] The construction of the liquid cargo tank containment system of LNG ships generally requires the setting of side process holes for the entry and exit of personnel and materials during the construction process. The small sections at the side process holes are removed before the corresponding area sections are loaded, and reinstalled after the construction of the containment system in the cabin is completed. Since the side process hole small section is facing the outer plate side downward during removal, it needs to be turned over and lifted to the process hole position by a crane. At this time, the crane wire rope can only be set on the outer plate side of the small section, but in this state, the small section is unbalanced and tilted. For a long time, the installation of this small section has been difficult.

[0003] In the prior art, the small sections of the side process holes are installed by using a crane to hang them and dragging them inwards with a hoist in an inclined state, which has the following disadvantages:

[0004] First, the small sections of the side process holes are in an inclined state during installation and cannot be quickly put into place. It is time-consuming and laborious to drag them into place using a hoist, and the work efficiency is low.

[0005] Second, the installation requires the cooperation of a crane and a hoist. At this time, the side process hole area is at a high altitude, and the outer plate side and the inner shell side are both open, so the safety risk of the towing operation is relatively high.

[0006] Third, when dragging inward in an inclined state, there is scratching and squeezing between the small segment structure and the process hole opening, which can easily cause damage to the edge structure and increase the workload of structural repair after the small segment is in place, which is not conducive to the high-quality installation of the small segment of the side process hole. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for installing the segmented process hole on the side of an LNG ship. The method of the present invention installs a suspension platform on the segmented process hole on the side of the LNG ship, and installs the segmented process hole on the side of the ship smoothly and without tilting into the process hole by hoisting the cantilevered platform, thereby improving the installation efficiency.

[0008] In order to achieve the purpose of the above invention, the technical solution provided by the patent of this invention is as follows:

[0009] A method for installing a LNG ship side process hole segment, wherein the LNG ship side process hole segment is trapezoidal in shape as a whole, and an inner shell plate of the LNG ship side process hole segment is provided with an inner shell plate eye plate, and the method specifically comprises the following steps:

[0010] The first step is to determine the outer plate side eye plate position of the LNG ship side process hole segment and the LNG ship side process hole segment top support position according to the position height of the side eye plate and the side top support of the cantilever platform, and install the outer plate side eye plate at the outer plate side eye plate position determined by the LNG ship side process hole segment, install the second reverse side reinforcing rib at the top support position determined by the LNG ship side process hole segment, and install the first reverse side reinforcing rib at the outer plate side eye plate position;

[0011] The second step is to rotate the side process hole segment of the LNG ship from a horizontal position by 90° counterclockwise by using the outer plate side eye plate of the LNG ship side process hole segment and the inner shell plate side eye plate of the LNG ship side process hole segment to place the side process hole segment of the LNG ship on the ground in a normal position;

[0012] The third step is to fix the side eye plate of the cantilever platform with the side eye plate of the outer plate of the process hole segment on the side of the LNG ship through the connecting pins, and at the same time, the side top support of the cantilever platform is movably connected with the top support position of the process hole segment on the side of the LNG ship, so that the bottom end surface of the cantilever platform is perpendicular to the outer plate side of the process hole segment on the side of the LNG ship;

[0013] The fourth step is to adjust the center of gravity of the process hole section on the side of the LNG ship and the cantilever platform as a whole, and place a counterweight in the cantilever platform so that the distance between the center of gravity of the process hole section on the side of the LNG ship and the cantilever platform as a whole and the center of the cantilever platform is not greater than 1000 mm;

[0014] Step 5: After the center of gravity position of the process hole section on the side of the LNG ship and the cantilever platform as a whole is adjusted, the wire rope is connected to the lifting code at the top of the cantilever platform by using a crane hook, and the process hole section on the side of the LNG ship and the cantilever platform as a whole are tested by using a crane;

[0015] Step 6: After the trial lifting of the LNG ship side process hole segment and the cantilever platform as a whole is completed, the LNG ship side process hole segment and the cantilever platform are hoisted as a whole by a crane, so that the side process hole segment is installed to the LNG ship side process hole;

[0016] Step 7. After the installation of the LNG ship's side process hole sections is completed, the construction workers weld and fix the LNG ship's side process hole sections in the cantilever platform. After the welding of the LNG ship's side process hole sections is completed, the cantilever platform is separated from the LNG ship's side process hole sections, and the cantilever platform is moved away by a crane to complete the installation of the LNG ship's side process hole sections.

[0017] The cantilever platform in the first step mentioned above includes a main frame, side eye plates, side top supports, top surface hanging codes and weight limiters; the cantilever platform is a rectangular frame structure with an open upper end, the main frame is installed on the sides around the cantilever platform, the top surface hanging codes are respectively installed at the four corners of the upper end of the main frame, the side eye plates are installed on both sides of the upper end of the side of the main frame close to the outer side plate of the process hole segment on the side of the LNG ship, the side top supports are installed on both sides of the lower end of the side of the main frame close to the outer side plate of the process hole segment on the side of the LNG ship, a weight limiter is arranged in the cantilever platform, and a weight is installed in the weight limiter.

[0018] Fixed railings and detachable railings are installed in the above-mentioned main frame. The detachable railings are installed on the side of the main frame away from the outer side plate of the process hole segmentation on the LNG ship's side, and the fixed railings are installed on the side of the main frame perpendicular to the outer side plate of the process hole segmentation on the LNG ship's side and on the side of the main frame close to the outer side plate of the process hole segmentation on the LNG ship's side; the fixed railings are distributed on the main frame in a grid shape.

[0019] The disassembly and assembly platform and the platform inclined ladder are also installed in the above-mentioned cantilever platform. The disassembly and assembly platform is installed on one side of the cantilever platform close to the outer side plate of the process hole segment on the side of the LNG ship. The disassembly and assembly platform is a rectangular parallelepiped as a whole. One side of the disassembly and assembly platform is connected and fixed to the main frame, and the platform inclined ladder is installed on the other side of the disassembly and assembly platform.

[0020] The length of the side support is the same as the length of the side eye plate, and the error between the length of the side support and the length of the side eye plate is no more than 2 mm.

[0021] When the side eye plates of the cantilever platform in the above-mentioned third step are connected to the outer plate side eye plates of the LNG ship's side process hole segment through connecting pins, the distance between the side eye plates of the cantilever platform is the same as the distance between the outer plate side eye plates of the LNG ship's side process hole segment, and the error between the side eye plates of the cantilever platform and the distance between the outer plate side eye plates of the LNG ship's side process hole segment is ±2mm.

[0022] When the crane in the fifth step performs a trial lifting on the LNG ship's side process hole segment and the cantilever platform as a whole, the LNG ship's side process hole segment and the cantilever platform as a whole are kept in a horizontal state during the trial lifting process, and the inclination error of the LNG ship's side process hole segment and the cantilever platform as a whole is not greater than 50 mm.

[0023] The specific steps for separating the sections of the process holes in the cantilever platform and on the side of the LNG ship in the seventh step are as follows: after the sections of the process holes on the side of the LNG ship are installed, the construction personnel climb onto the disassembly platform through the inclined ladder inside the cantilever platform to remove the connecting pins at the upper end of the cantilever platform, so as to separate the sections of the cantilever platform and the process holes on the side of the LNG ship. At the same time, the crane moves the cantilever platform away through the lifting code on the top surface of the cantilever platform, so as to complete the separation of the sections of the process holes in the cantilever platform and on the side of the LNG ship.

[0024] The method of the present invention has achieved the following positive and beneficial effects through practice:

[0025] 1. Compared with the prior art, the method for installing the side process hole segments of an LNG ship of the present invention adopts a cantilever platform to install the side process hole segments, so that the side process hole segments enter the process hole position in a normal state, the installation is stable, the construction safety is improved, and the installation construction period is shortened.

[0026] 2. Compared with the prior art, the installation method of the side process hole segment of an LNG ship of the present invention installs a pressure iron on the cantilever platform to prevent the side process hole segment from tilting during hoisting, thereby avoiding the auxiliary operation of construction personnel using a hoist to drag the side process hole segment into the process hole, thereby reducing the construction safety risk.

[0027] 3. Compared with the prior art, the installation method of the LNG ship's side process hole segment by using a cantilever platform to assist in the installation of the LNG ship's side process hole segment will not cause scratching and squeezing of the LNG ship's side process hole segment and the side process hole structure, thereby avoiding damage to the side process hole edge structure during the installation process, avoiding additional repair work, improving the installation quality, and shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a horizontal structural diagram of a segmented process hole on the side of an LNG ship in a method for installing a segmented process hole on the side of an LNG ship according to the present invention.

[0029] Figure 2 The invention discloses an installation structure diagram of a LNG ship side process hole segment and a cantilever platform in a method for installing a LNG ship side process hole segment.

[0030] Figure 3 It is a front view of a cantilever platform in a method for installing a segmented process hole on the side of an LNG ship according to the present invention.

[0031] Figure 4 The present invention is a top view of a cantilever platform in a method for installing a segmented process hole on the side of an LNG ship.

[0032] Figure 5It is a cross-sectional view of a cantilever platform bb in a method for installing a segmented process hole on the side of an LNG ship according to the present invention.

[0033] Figure 6 The present invention is a schematic diagram of the segmented installation of the process holes on the side of an LNG ship in a method for installing the segmented process holes on the side of an LNG ship. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific examples 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.

[0035] like Figure 1 As shown, the present invention relates to a LNG ship side process hole segment 1 which is overall trapezoidal in shape, and an inner shell plate 15 of the LNG ship side process hole segment 1 is provided with an inner shell plate eye plate 11.

[0036] like Figure 2-6 As shown, a method for installing a segmented process hole on the side of an LNG ship comprises the following steps:

[0037] The first step is to determine the position of the outer plate side eye plate 12 of the LNG ship side process hole segment 1 and the top support position of the LNG ship side process hole segment 1 according to the position height of the side eye plate 22 and the side top support 23 of the cantilever platform 2, and install the outer plate side eye plate 12 at the outer plate side eye plate 12 position determined by the LNG ship side process hole segment 1, install the second reverse reinforcing rib 14 at the top support position determined by the LNG ship side process hole segment 1, and install the first reverse reinforcing rib 13 at the outer plate side eye plate 12 position;

[0038] The second step is to use the outer plate side eye plate 12 of the LNG ship side process hole segment 1 and the inner shell plate eye plate 11 of the LNG ship side process hole segment 1 to rotate the side process hole segment 1 by 90 degrees counterclockwise from the horizontal state to the normal state of the LNG ship side process hole segment 1 and place it on the ground;

[0039] The third step is to fix the side eye plate 22 of the cantilever platform 2 with the outer plate side eye plate 12 of the LNG ship side process hole segment 1 through the connecting pin 31, and at the same time, the side top support 23 of the cantilever platform 2 is flexibly connected with the top support position of the LNG ship side process hole segment 1, so that the bottom end surface of the cantilever platform 2 is perpendicular to the outer plate side 16 of the LNG ship side process hole segment 1; the cantilever platform 2 is fixedly connected to the LNG ship side process hole segment 1 through the upper end connecting pin 31, and the lower end is flexibly connected to the LNG ship side process hole segment 1 through the side top support 23, which improves the convenience of installation, facilitates rapid dismantling after construction is completed, and shortens the construction period;

[0040] The fourth step is to adjust the center of gravity of the LNG ship side process hole segment 1 and the cantilever platform 2 as a whole, and place a counterweight 32 in the cantilever platform 2 so that the distance between the center of gravity of the LNG ship side process hole segment 1 and the cantilever platform 2 as a whole and the center of the cantilever platform 2 is not greater than 1000mm; so that the overall structure remains horizontal when the crane is suspended, thereby improving the efficiency of the installation of the LNG ship side process hole segment 1 and the construction safety of the construction personnel in the cantilever platform 2;

[0041] In the fifth step, after the center of gravity position of the process hole segment 1 on the side of the LNG ship and the cantilever platform 2 as a whole is adjusted, the wire rope 34 is connected to the lifting code at the top of the cantilever platform 2 by using the crane hook 33, and the LNG ship side process hole segment 1 and the cantilever platform 2 are tested by using the crane; the weight 32 is installed in the cantilever platform 2 to flexibly adjust the center of gravity of the overall structure, ensure the balance of the overall structure, and improve construction safety;

[0042] Step 6: After the trial lifting of the LNG ship side process hole segment 1 and the cantilever platform 2 is completed, the LNG ship side process hole segment 1 and the cantilever platform 2 are hoisted as a whole by a crane, so that the side process hole segment is installed to the LNG ship side process hole 3;

[0043] Step 7. After the installation of the LNG ship's side process hole segment 1 is completed, the construction workers weld and fix the LNG ship's side process hole segment 1 in the cantilever platform 2. After the welding of the LNG ship's side process hole segment 1 is completed, the cantilever platform 2 is separated from the LNG ship's side process hole segment 1, and the cantilever platform 2 is moved away by a crane to complete the installation of the LNG ship's side process hole segment 1.

[0044] The cantilever platform 2 in the above-mentioned first step includes a main frame 21, side eye plates 22, side top supports 23, top surface hanging codes 24 and pressure iron limiters 27; the cantilever platform 2 is a rectangular frame structure with an open upper end, the main frame 21 is installed on the sides of the cantilever platform 2, the top surface hanging codes 24 are respectively installed at the four corners of the upper end of the main frame 21, the side eye plates 22 are installed on both sides of the upper end of the side of the main frame 21 close to the outer plate of the process hole segment 1 on the side of the LNG ship, the side top supports 23 are installed on both sides of the lower end of the side of the main frame 21 close to the outer plate of the process hole segment 1 on the side of the LNG ship, a pressure iron limiter 27 is arranged in the cantilever platform 2, and a pressure iron 32 is installed in the pressure iron limiter 27.

[0045] A fixed railing 28 and a detachable railing are installed in the main frame 21. The detachable railing is installed on the side of the main frame 21 away from the outer plate of the process hole segment 1 on the side of the LNG ship, and the fixed railing 28 is installed on the side of the main frame 21 perpendicular to the outer plate of the process hole segment 1 on the side of the LNG ship and on the side of the main frame 21 close to the outer plate of the process hole segment 1 on the side of the LNG ship; the fixed railing 28 is distributed on the main frame 21 in a grid shape.

[0046] The disassembly and assembly platform 25 and the platform inclined ladder 26 are also installed in the above-mentioned cantilever platform 2. The disassembly and assembly platform 25 is installed on one side of the cantilever platform 2 close to the outer plate of the process hole segment 1 on the side of the LNG ship. The disassembly and assembly platform 25 is a rectangular parallelepiped as a whole. One side of the disassembly and assembly platform 25 is connected and fixed to the main frame 21, and the platform inclined ladder 26 is installed on the other side of the disassembly and assembly platform 25.

[0047] The length of the side support 23 is the same as that of the side eye plate 22, and the error between the length of the side support 23 and the length of the side eye plate 22 is no more than 2 mm.

[0048] When the side eye plates 22 of the cantilever platform 2 in the above-mentioned third step are connected to the outer plate side eye plates 12 of the LNG ship's side process hole segment 1 through the connecting pins 31, the distance between the side eye plates 22 of the cantilever platform 2 is the same as the distance between the outer plate side eye plates 12 of the LNG ship's side process hole segment 1, and the distance error between the side eye plates 22 of the cantilever platform 2 and the distance between the outer plate side eye plates 12 of the LNG ship's side process hole segment 1 is ±2mm.

[0049] When the crane in the fifth step performs a trial lifting on the LNG ship's side process hole segment 1 and the cantilever platform 2 as a whole, the LNG ship's side process hole segment 1 and the cantilever platform 2 as a whole are kept in a horizontal state during the trial lifting process, and the inclination error of the LNG ship's side process hole segment 1 and the cantilever platform 2 as a whole is not greater than 50 mm.

[0050] The specific steps for separating the process hole segment 1 on the side of the LNG ship from the cantilever platform 2 in the seventh step are as follows: after the installation of the process hole segment 1 on the side of the LNG ship is completed, the construction personnel climb onto the disassembly platform 25 through the platform inclined ladder 26 inside the cantilever platform 2 to remove the connecting pin 31 at the upper end of the cantilever platform 2, so that the cantilever platform 2 is separated from the process hole segment 1 on the side of the LNG ship. At the same time, the crane moves the cantilever platform 2 away through the top surface hanging code 24 of the cantilever platform 2, completing the separation of the cantilever platform 2 from the process hole segment 1 on the side of the LNG ship.

[0051] 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 installing a LNG ship side process hole segment, wherein the LNG ship side process hole segment (1) is trapezoidal in shape as a whole, and an inner shell plate (15) of the LNG ship side process hole segment (1) is provided with an inner shell plate eye plate (11), characterized in that: The method specifically comprises the following steps: The first step is to determine the position of the outer plate side eye plate (12) of the LNG ship side process hole section (1) and the top support position of the LNG ship side process hole section (1) according to the position height of the side eye plate (22) and the side top support (23) of the cantilever platform (2), and install the outer plate side eye plate (12) at the outer plate side eye plate (12) position determined by the LNG ship side process hole section (1), install the second reverse side reinforcing rib (14) at the top support position determined by the LNG ship side process hole section (1), and install the first reverse side reinforcing rib (13) at the outer plate side eye plate (12) position; The second step is to use the outer plate side eye plate (12) of the LNG ship side process hole segment (1) and the inner shell plate eye plate (11) of the LNG ship side process hole segment (1) to rotate the side process hole segment 90 degrees counterclockwise from the horizontal state to the normal state of the LNG ship side process hole segment (1) and place it on the ground; The third step is to fix the side eye plate (22) of the cantilever platform (2) to the outer plate side eye plate (12) of the LNG ship side process hole segment (1) through the connecting pin (31), and at the same time, the side top support (23) of the cantilever platform (2) is movably connected to the top support position of the LNG ship side process hole segment (1), so that the bottom end surface of the cantilever platform (2) is perpendicular to the outer plate side (16) of the LNG ship side process hole segment (1); The fourth step is to adjust the center of gravity of the process hole section (1) on the side of the LNG ship and the cantilever platform (2) as a whole, and place a counterweight (32) in the cantilever platform (2) so that the distance between the center of gravity of the process hole section (1) on the side of the LNG ship and the cantilever platform (2) as a whole and the center of the cantilever platform (2) is not greater than 1000 mm; In the fifth step, after the center of gravity position of the LNG ship side process hole segment (1) and the cantilever platform (2) as a whole is adjusted, the steel wire rope (34) is connected to the lifting weight at the top of the cantilever platform (2) by using a crane hook (33), and the LNG ship side process hole segment (1) and the cantilever platform (2) as a whole are tested by using a crane; Step 6: After the trial lifting of the LNG ship side process hole segment (1) and the cantilever platform (2) as a whole is completed, the LNG ship side process hole segment (1) and the cantilever platform (2) are hoisted as a whole by a crane, so that the side process hole segment is installed to the LNG ship side process hole (3); In the seventh step, after the installation of the LNG ship's side process hole segment (1) is completed, the construction personnel weld and fix the LNG ship's side process hole segment (1) in the cantilever platform (2). After the welding of the LNG ship's side process hole segment (1) is completed, the cantilever platform (2) is separated from the LNG ship's side process hole segment (1), and the cantilever platform (2) is moved away by a crane, thereby completing the installation of the LNG ship's side process hole segment (1).

2. The method for installing the segmented process holes on the side of an LNG ship according to claim 1 is characterized in that: The cantilever platform (2) in the first step comprises a main frame (21), side eye plates (22), side top supports (23), top hanging weights (24) and a pressure iron limiter (27); the cantilever platform (2) is a rectangular parallelepiped frame structure with an open top, the main frame (21) is installed on the sides of the cantilever platform (2), the top hanging weights (24) are installed at the four corners of the upper end of the main frame (21), the side eye plates (22) are installed on both sides of the upper end of the side of the main frame (21) close to the outer plate of the process hole segment (1) on the side of the LNG ship, and the side top supports (23) are installed on both sides of the lower end of the side of the main frame (21) close to the outer plate of the process hole segment (1) on the side of the LNG ship, and a pressure iron limiter (27) is arranged in the cantilever platform (2), and a pressure iron (32) is installed in the pressure iron limiter (27).

3. The method for installing the segmented process holes on the side of an LNG ship according to claim 2 is characterized in that: A fixed railing (28) and a detachable railing are installed in the main frame (21); the detachable railing is installed on the side of the main frame (21) away from the outer plate of the process hole section (1) on the side of the LNG ship, and the fixed railing (28) is installed on the side of the main frame (21) perpendicular to the outer plate of the process hole section (1) on the side of the LNG ship and on the side of the main frame (21) close to the outer plate of the process hole section (1) on the side of the LNG ship; the fixed railing (28) is distributed on the main frame (21) in a grid shape.

4. The method for installing the segmented process holes on the side of an LNG ship according to claim 2 is characterized in that: A disassembly platform (25) and a platform inclined ladder (26) are also installed in the cantilever platform (2). The disassembly platform (25) is installed on one side of the cantilever platform (2) close to the outer plate of the process hole section (1) on the side of the LNG ship. The disassembly platform (25) is a rectangular parallelepiped as a whole. One side of the disassembly platform (25) is connected and fixed to the main frame (21), and the platform inclined ladder (26) is installed on the other side of the disassembly platform (25).

5. The method for installing the segmented process holes on the side of an LNG ship according to claim 2, characterized in that: The length of the side support (23) is the same as the length of the side eye plate (22), and the error between the length of the side support (23) and the length of the side eye plate (22) is no more than 2 mm.

6. The method for installing the segmented process holes on the side of an LNG ship according to claim 1, characterized in that: When the side eye plates (22) of the cantilever platform (2) in the third step are connected to the outer plate side eye plates (12) of the LNG ship's side process hole segment (1) through the connecting pins (31), the distance between the side eye plates (22) of the cantilever platform (2) is the same as the distance between the outer plate side eye plates (12) of the LNG ship's side process hole segment (1), and the distance error between the side eye plates (22) of the cantilever platform (2) and the outer plate side eye plates (12) of the LNG ship's side process hole segment (1) is ±2 mm.

7. The method for installing the segmented process holes on the side of an LNG ship according to claim 1, characterized in that: When the crane in the fifth step performs a trial lifting on the LNG ship's side process hole segment (1) and the cantilever platform (2) as a whole, the LNG ship's side process hole segment (1) and the cantilever platform (2) as a whole are kept in a horizontal state during the trial lifting process, and the inclination error of the LNG ship's side process hole segment (1) and the cantilever platform (2) as a whole is not greater than 50 mm.

8. The method for installing the segmented process holes on the side of an LNG ship according to claim 1, characterized in that: The specific steps of separating the process hole segment (1) inside the cantilever platform (2) and the side process hole segment (1) of the LNG ship in the seventh step are as follows: after the installation of the process hole segment (1) on the side process hole of the LNG ship is completed, the construction personnel climb onto the disassembly platform (25) through the platform inclined ladder (26) inside the cantilever platform (2) to remove the connecting pin (31) at the upper end of the cantilever platform (2), so as to separate the cantilever platform (2) from the side process hole segment (1) of the LNG ship; at the same time, the crane moves the cantilever platform (2) away through the top surface hanging code (24) of the cantilever platform (2), so as to complete the separation of the process hole segment (1) inside the cantilever platform (2) and the side process hole segment (1) of the LNG ship.

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