A method for installing an embedded side process hole platform on an LNG ship

Abstract

The present invention discloses an installation method of an embedded side process hole platform of an LNG ship. The method carries the embedded side process hole platform together with the installation platform of the liquid cargo tank containment system of the LNG ship. After the installation of the liquid cargo tank containment system of the LNG ship is completed, the structure welding and containment system installation operations of the side process hole area of ​​the LNG ship are performed through the embedded side process hole platform. The method avoids the additional erection of a disc buckle scaffolding, thereby reducing the platform installation workload of the sealing operation of the side process hole of the liquid cargo tank of the LNG ship, reducing waiting time, improving production efficiency, and shortening the construction period.

Description

Technical Field

[0001] The invention relates to the field of shipbuilding, and in particular to an installation method for an embedded side process hole platform of an LNG ship. Background Art

[0002] The construction of the containment system of the liquid cargo tank of an LNG ship generally requires the installation of a side process hole for the entry and exit of personnel and materials during the construction process. At the same time, the construction of the containment system in the liquid cargo tank requires the construction of a dedicated containment system installation platform in the full tank. Since the parts of the containment system installation platform are large in size and cannot be moved out of the tank through the gas dome opening, it is necessary to completely remove the containment system installation platform in the tank before sealing the side process hole, exit the tank through the side process hole, and then build an additional scaffolding with relatively small parts in the side process hole area.

[0003] In the prior art, the construction platform in the side process hole area needs to be re-erected after the installation platform of the entire cabin enclosure system is dismantled, which has the following shortcomings:

[0004] First, the sealing of the side process holes belongs to the finishing work of the liquid cargo tank containment system, and the construction period is tight. First, the entire tank containment system platform is dismantled and then the disc scaffolding is re-erected. This is a serial operation with low efficiency and long period.

[0005] Second, the reconstruction of a large number of spiral scaffolding in the side process hole area poses a great safety risk to passage, transportation and installation, which can easily cause accidents such as material collisions and collisions with people. At this time, the enclosure system except for the process holes has been installed, which brings great risks to the protection of the enclosure system.

[0006] Thirdly, the overall strength of the coiled scaffolding is lower than that of the enclosure system installation platform in the original cabin, and the sealing of the side process holes involves the stacking and use of a large number of insulating boxes, invar plates, and welding equipment, which cannot be fully installed and need to be weight-limited, which easily causes construction delays. 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 an embedded side process hole platform on an LNG ship. The method of the present invention embeds the embedded side process hole platform into the original installation platform of the entire tank enclosure system, and retains it before sealing the hole, thereby avoiding the additional erection of a disc scaffolding, thereby reducing the platform installation workload for the sealing operation of the side process hole of the liquid cargo tank of the LNG ship, reducing waiting time, and improving production 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 an embedded side process hole platform of an LNG ship, the method specifically comprising the following steps:

[0010] The first step is to prepare an embedded side process hole platform device, which includes a support leg, a bottom frame and an upper frame; the bottom of the support leg is installed at the bottom of the LNG ship liquid cargo tank close to the side process hole of the LNG ship, and the bottom frame and the upper frame are installed above the support leg;

[0011] The second step is to build the embedded side process hole platform device together with the LNG ship liquid cargo tank containment system installation platform inside the LNG ship liquid cargo tank, and the embedded side process hole platform device is installed below the LNG ship side process hole;

[0012] Step 3: After the installation of the LNG carrier liquid cargo tank containment system is completed, the installation platform of the LNG carrier liquid cargo tank containment system is removed, and the embedded side process hole platform device installed in the second step is retained;

[0013] Step 4: After the installation platform of the LNG carrier liquid cargo tank containment system is dismantled, diagonal braces, stairs, hangers, railings and special steel gangplanks are installed on the embedded side process hole platform device;

[0014] Step 5: After the diagonal braces, stairs, hangers, railings and special steel gangplank on the embedded side process hole platform device are installed, the structural welding and enclosure system installation work of the LNG ship side process hole area is carried out on the embedded side process hole platform device;

[0015] Step 6: After the structural welding and enclosure system installation work in the side process hole area of ​​the LNG ship is completed, the embedded side process hole platform device is removed, and the components of the removed embedded side process hole platform are moved out of the LNG ship liquid cargo tank through the gas dome cylinder of the LNG ship liquid cargo tank;

[0016] The length of the supporting legs, bottom frame and upper frame in the first step is not more than 2500mm, and the width of the supporting legs, bottom frame and upper frame is not more than 1200mm; a total of four platforms are set up between the bottom frame and the upper frame.

[0017] The height of the embedded side process hole platform device in the first step is lower than the height of the LNG ship's side process hole, one side of the support leg is close to the midship direction, and the other side of the support leg is on the side of the ship; the length of the embedded side process hole platform device from the LNG ship's side process hole to the bow direction is greater than 2400mm; the length of the embedded side process hole platform device from the LNG ship's side process hole to the stern direction is greater than 2400mm.

[0018] When installing the diagonal brace on the embedded side process hole platform device in the fourth step, the diagonal brace is installed before the installation platform of the LNG ship liquid cargo tank containment system is dismantled; a diagonal brace is arranged on the lower side of the first platform close to the side wall of the LNG ship liquid cargo tank, one end of the diagonal brace is connected to the lower side of the first platform, and the other end of the diagonal brace is connected and fixed to the side wall of the LNG ship liquid cargo tank; a diagonal brace is arranged on the lower side of the second platform close to the side wall of the LNG ship liquid cargo tank, one end of the diagonal brace is connected to the lower side of the second platform, and the other end of the diagonal brace is connected and fixed to the side wall of the LNG ship liquid cargo tank.

[0019] A staircase is installed on the embedded side process hole platform device in the fourth step, and the staircase is installed on the embedded side process hole platform device near the bow; each platform is provided with a staircase, the third platform and the fourth platform are provided with two staircases, a staircase is provided between the third platform and the fourth platform near the midship direction, and a staircase is provided between the third platform and the fourth platform near the side direction; a staircase is provided between the third platform and the second platform near the midship direction, a staircase is provided between the second platform and the first platform near the midship direction, and a staircase is provided between the first platform near the midship direction and the bottom of the liquid cargo tank of the LNG ship.

[0020] A hanger is installed on the embedded side process hole platform device in the fourth step. The hanger is installed on the stern direction of the embedded side process hole platform device. The hanger is installed on the fourth platform near the midship in the stern direction.

[0021] The above-mentioned hanger includes a main frame, a rotating boom and an electric hoist. The bottom of the main frame is connected to the fourth-layer platform, the top of the main frame is connected to the rotating boom, and the lower end of the rotating boom is connected to the electric hoist.

[0022] The embedded side process hole platform device in the fourth step is also equipped with guardrails and special steel gangplanks. The guardrails are installed on both sides of the third and fourth platforms, and the special steel gangplanks are installed at the staircase between each platform.

[0023] The above-mentioned special steel springboard includes a main board, a flap and a claw. The flap is installed on one side of the main board, and the claw is installed on the other side of the main board. One side of the flap is movably connected to the main board. When the special steel springboard is installed, the flap covers the staircase entrance.

[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 an embedded side process hole platform of an LNG ship of the present invention embeds the side process hole platform into the installation platform of the whole cabin containment system of the LNG ship liquid cargo tank, and is a part of the installation platform of the containment system, and has the same strength, layout and functional requirements, and will not affect the construction work of the containment system in the cabin before sealing the hole.

[0026] 2. Compared with the prior art, the method for installing an embedded side process hole platform for LNG ships of the present invention retains the embedded side process hole platform before sealing the hole, and only needs to add a small number of parts to quickly complete the installation. It is used for sealing operations and does not require additional scaffolding, which reduces the workload and time of one erection and one dismantling, improves installation efficiency, and shortens the construction period.

[0027] 3. Compared with the prior art, the embedded side process hole platform of the LNG ship embedded side process hole platform installation method of the present invention has high structural strength, which can meet the sufficient stacking of various materials and equipment for the sealing operation without the need for weight limit, thereby ensuring the continuity of various work of the sealing operation.

[0028] 4. Compared with the prior art, the embedded side process hole platform of the LNG ship embedded side process hole platform installation method of the present invention can be arranged in advance according to the position of the process hole, and can meet the use of various medium and large LNG ship liquid cargo tanks, and has high versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a diagram showing the overall structure of an embedded side process hole platform device in an installation method for an embedded side process hole platform of an LNG ship and an installation platform for a liquid cargo tank containment system of the LNG ship.

[0030] Figure 2 The invention discloses a top view of an embedded side process hole platform device and an installation platform of a liquid cargo tank containment system of an LNG ship in an installation method of an embedded side process hole platform of the present invention.

[0031] Figure 3 It is a structural diagram of an embedded side process hole platform device at the bow of an LNG ship in an installation method of an embedded side process hole platform of an LNG ship of the present invention.

[0032] Figure 4 The present invention is a structural diagram of an embedded side process hole platform device at the stern of an LNG ship in an installation method of an embedded side process hole platform of an LNG ship.

[0033] Figure 5 The invention discloses a top view of an embedded side process hole platform device at the stern of an LNG ship in an installation method of an embedded side process hole platform of an LNG ship according to the present invention.

[0034] Figure 6 It is a front view of a special steel gangway in an installation method of an embedded side process hole platform of an LNG ship according to the present invention.

[0035] Figure 7 It is a top view of a special steel gangway in an installation method of an embedded side process hole platform of an LNG ship according to the present invention. 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 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.

[0037] like Figure 1-7 As shown, a method for installing an embedded side process hole platform of an LNG ship comprises the following steps:

[0038] The first step is to prepare an embedded side process hole platform device 1, which includes a support leg 5, a bottom frame 6 and an upper frame 7; the bottom of the support leg 5 is installed at the bottom of the LNG ship liquid cargo tank close to the side process hole 2 of the LNG ship, and the bottom frame 6 and the upper frame 7 are installed above the support leg 5; the embedded side process hole platform device 1 meets the strength, layout and functional requirements required for the installation platform of the entire tank enclosure system, and improves the safety of the overall installation platform;

[0039] The second step is to build the embedded side process hole platform device 1 together with the LNG ship liquid cargo tank containment system installation platform 3 inside the LNG ship liquid cargo tank, and the embedded side process hole platform device 1 is installed below the LNG ship side process hole 2;

[0040] In the third step, after the installation of the LNG ship liquid cargo tank containment system is completed, the LNG ship liquid cargo tank containment system installation platform 3 is removed, and the embedded side process hole platform device 1 installed in the second step is retained;

[0041] Step 4: After the LNG carrier liquid cargo tank containment system installation platform 3 is dismantled, the diagonal brace 9, the staircase 8, the hanger 90, the handrail and the special steel gangway 95 are installed on the embedded side process hole platform device 1;

[0042] Step 5: After the diagonal brace 9, the staircase 8, the hanger 90, the handrail and the special steel gangway 95 on the embedded side process hole platform device 1 are installed, the structural welding and enclosure system installation operations are carried out in the area of ​​the LNG ship side process hole 2 on the embedded side process hole platform device 1;

[0043] Step 6: After the structural welding and enclosure system installation work in the area of ​​the LNG ship's side process hole 2 is completed, the embedded side process hole platform device 1 is removed, and the components of the removed embedded side process hole platform are moved out of the LNG ship's liquid cargo tank through the gas dome cylinder 4 of the LNG ship's liquid cargo tank;

[0044] The length of the supporting legs 5, the bottom frame 6 and the upper frame 7 in the first step is not more than 2500 mm, and the width of the supporting legs 5, the bottom frame 6 and the upper frame 7 is not more than 1200 mm; a total of four platforms are set up between the bottom frame 6 and the upper frame 7; the sizes of the supporting legs 5, the bottom frame 6 and the upper frame 7 are limited to facilitate the support legs 5, the bottom frame 6 and the upper frame 7 to be transported out of the LNG liquid cargo tank through the gas dome cylinder 4 of the LNG ship liquid cargo tank after disassembly.

[0045] The height of the embedded side process hole platform device 1 in the first step is lower than the height of the LNG ship side process hole 2, one side of the support leg 5 is close to the midship direction, and the other side of the support leg 5 is on the side of the ship; the length of the embedded side process hole platform device 1 from the LNG ship side process hole 2 to the bow direction is greater than 2400mm; the length of the embedded side process hole platform device 1 from the LNG ship side process hole 2 to the stern direction is greater than 2400mm.

[0046] When the diagonal brace 9 is installed on the embedded side process hole platform device 1 in the fourth step above, the diagonal brace 9 is installed before the installation platform 3 of the LNG ship liquid cargo tank containment system is dismantled; a diagonal brace 9 is arranged on the lower side of the first platform 11 close to the side wall of the LNG ship liquid cargo tank, one end of the diagonal brace 9 is connected to the lower side of the first platform 11, and the other end of the diagonal brace 9 is connected and fixed to the side wall of the LNG ship liquid cargo tank; a diagonal brace 9 is arranged on the lower side of the second platform 12 close to the side wall of the LNG ship liquid cargo tank, one end of the diagonal brace 9 is connected to the lower side of the second platform 12, and the other end of the diagonal brace 9 is connected and fixed to the side wall of the LNG ship liquid cargo tank; the diagonal brace 9 improves the stability of the embedded side process hole platform device 1 and improves construction safety.

[0047] A staircase 8 is installed on the embedded side process hole platform device 1 in the fourth step, and the staircase 8 is installed on the embedded side process hole platform device 1 near the bow; each platform is provided with a staircase 8, the third platform 13 and the fourth platform 14 are provided with two staircases 8, a staircase 8 is provided between the third platform 13 and the fourth platform 14 near the midship direction, and a staircase 8 is provided between the third platform 13 and the fourth platform 14 near the side direction; a staircase 8 is provided between the third platform 13 and the second platform 12 near the midship direction, a staircase 8 is provided between the second platform 12 and the first platform 11 near the midship direction, and a staircase 8 is provided between the first platform 11 near the midship direction and the bottom of the liquid cargo tank of the LNG ship; the stairs 8 provided between each platform are convenient for construction personnel to enter and exit; two stairs 8 are provided between the third platform 13 and the fourth platform 14 to improve the efficiency of construction personnel in the construction of the fourth platform 14.

[0048] A hanger 90 is installed on the embedded side process hole platform device 1 in the fourth step, and the hanger 90 is installed on the embedded side process hole platform device 1 in the stern direction, and the hanger 90 is installed on the fourth platform 14 near the midship in the stern direction; the hanger 90 is installed on the embedded side process hole platform device 1 to facilitate construction personnel to carry out structural welding and enclosure system installation operations in the LNG ship side process hole 2 area.

[0049] The hanger 90 includes a main frame 91 , a rotating boom 92 and an electric hoist 93 . The bottom of the main frame 91 is connected to the fourth-layer platform 14 , the top of the main frame 91 is connected to the rotating boom 92 , and the lower end of the rotating boom 92 is connected to the electric hoist 93 .

[0050] The embedded side process hole platform device 1 in the fourth step is also equipped with a guardrail 94 and a special steel gangway 95. The guardrail 94 is installed on both sides of the third platform 13 and the fourth platform 14, and the special steel gangway 95 is installed at the staircase 8 between each platform.

[0051] The above-mentioned special steel springboard 95 includes a main board 952, a flap 951 and a claw 953. The flap 951 is installed on one side of the main board 952, and the claw 953 is installed on the other side of the main board 952. One side of the flap 951 is movably connected to the main board 952; when the special steel springboard 95 is installed, the flap 951 covers the entrance of the stairs 8; the special steel springboard 95 is set at the entrance of the stairs 8. When construction is carried out on the embedded side process hole platform device 1, the flap 951 is opened to facilitate the construction personnel to enter and exit, and the flap 951 is closed when no construction is carried out.

[0052] 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 an embedded side process hole platform of an LNG ship, characterized in that: The method specifically comprises the following steps: The first step is to prepare an embedded side process hole platform device (1), which comprises a support leg (5), a bottom frame (6) and an upper frame (7); the bottom of the support leg (5) is installed on the bottom of the LNG ship's liquid cargo tank near the side process hole (2) of the LNG ship, and the bottom frame (6) and the upper frame (7) are installed above the support leg (5); a total of four platforms are set up between the bottom frame (6) and the upper frame (7), which are, from bottom to top, a first platform (11), a second platform (12), a third platform (13) and a fourth platform (14); The second step is to build the embedded side process hole platform device (1) together with the LNG ship liquid cargo tank containment system installation platform (3) inside the LNG ship liquid cargo tank, wherein the embedded side process hole platform device (1) is installed below the LNG ship side process hole (2); In the third step, after the installation of the LNG carrier liquid cargo tank containment system is completed, the LNG carrier liquid cargo tank containment system installation platform (3) is removed, and the embedded side process hole platform device (1) installed in the second step is retained; In the fourth step, after the LNG ship liquid cargo tank containment system installation platform (3) is dismantled, a diagonal brace (9), stairs (8), a hanger (90), a handrail and a special steel gangway (95) are installed on the embedded side process hole platform device (1); when the diagonal brace (9) is installed on the embedded side process hole platform device (1), the diagonal brace (9) is installed before the LNG ship liquid cargo tank containment system installation platform (3) is dismantled; a diagonal brace (9) is provided on the lower side of the first platform (11) close to the side wall of the LNG ship liquid cargo tank, and the diagonal brace (9) One end of the diagonal brace (9) is connected to the lower side of the first platform (11), and the other end of the diagonal brace (9) is connected and fixed to the side wall of the liquid cargo tank of the LNG ship; a diagonal brace (9) is provided on the lower side of the second platform (12) close to the side wall of the liquid cargo tank of the LNG ship, one end of the diagonal brace (9) is connected to the lower side of the second platform (12), and the other end of the diagonal brace (9) is connected and fixed to the side wall of the liquid cargo tank of the LNG ship; a staircase (8) is installed on the embedded side process hole platform device (1), and the staircase (8) is installed on the embedded side process hole platform device (1) close to the bow of the ship. The invention relates to a platform device (1); each platform is provided with a staircase (8); the third platform (13) and the fourth platform (14) are provided with two staircases (8); a staircase (8) is provided between the third platform (13) and the fourth platform (14) near the midship direction; a staircase (8) is provided between the third platform (13) and the fourth platform (14) near the side of the ship; a staircase (8) is provided between the third platform (13) and the second platform (12) near the midship direction; a staircase (8) is provided between the third platform (13) and the fourth platform (14) near the side of the ship; A staircase (8) is provided between the second platform (12) in the direction of the ship and the first platform (11), and a staircase (8) is provided between the first platform (11) in the direction close to the midship and the bottom of the liquid cargo tank of the LNG ship; a guardrail (94) and a special steel gangway (95) are also installed on the embedded side process hole platform device (1), the guardrail (94) is installed on both sides of the third platform (13) and the fourth platform (14), and the special steel gangway (95) is installed at the staircase (8) opening between each platform; Step 5: After the diagonal brace (9), stairs (8), hanger (90), handrails and special steel gangway (95) on the embedded side process hole platform device (1) are installed, structural welding and enclosure system installation operations are performed on the embedded side process hole platform device (1) in the area of ​​the LNG ship side process hole (2); In the sixth step, after the structural welding and enclosure system installation work in the area of ​​the LNG ship's side process hole (2) is completed, the embedded side process hole platform device (1) is removed, and the components of the removed embedded side process hole platform are moved out of the LNG ship's liquid cargo tank through the gas dome cylinder (4) of the LNG ship's liquid cargo tank.

2. According to the method for installing an embedded side process hole platform of an LNG ship according to claim 1, the length of the support legs (5), the bottom frame (6) and the upper frame (7) in the first step is not more than 2500 mm, and the width of the support legs (5), the bottom frame (6) and the upper frame (7) is not more than 1200 mm.

3. According to the method for installing an embedded side process hole platform of an LNG ship as described in claim 1, the height of the embedded side process hole platform device (1) in the first step is lower than the height of the side process hole (2) of the LNG ship, one side of the support leg (5) is close to the midship direction, and the other side of the support leg (5) is on the side of the ship; the length of the embedded side process hole platform device (1) from the side process hole (2) of the LNG ship to the bow direction is greater than 2400mm; the length of the embedded side process hole platform device (1) from the side process hole (2) of the LNG ship to the stern direction is greater than 2400mm.

4. According to the method for installing an embedded side process hole platform of an LNG ship as claimed in claim 1, a hanger (90) is installed on the embedded side process hole platform device (1) in the fourth step, and the hanger (90) is installed in the stern direction of the embedded side process hole platform device (1), and the hanger (90) is installed on the fourth platform (14) in the stern direction close to the midship.

5. According to the method for installing an embedded side process hole platform of an LNG ship as claimed in claim 4, the hanger (90) comprises a main frame (91), a rotating boom (92) and an electric hoist (93), the bottom of the main frame (91) is connected to the fourth platform (14), the top of the main frame (91) is connected to the rotating boom (92), and the lower end of the rotating boom (92) is connected to the electric hoist (93).

6. According to the method for installing an embedded side process hole platform of an LNG ship as claimed in claim 1, the special steel gangway (95) comprises a main board (952), a flap (951) and a claw (953), the flap (951) is installed on one side of the main board (952), the claw (953) is installed on the other side of the main board (952), and one side of the flap (951) is movably connected to the main board (952); when the special steel gangway (95) is installed, the flap (951) covers the entrance of the stairs (8).

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