A method of installing an exhaust arrangement for a large container ship

Abstract

The application discloses a mounting method for a large container ship exhaust device, and steps include S1, normally placing a smoke box on a portal tool, S2, mounting an expansion joint on an exhaust pipe, S3, connecting the expansion joint on the exhaust pipe with the smoke box, S4, mounting a reinforcement on the expansion joint, and S5, hoisting the connected smoke box and exhaust pipe to be welded with a ship body structure. The application guarantees quick and effective hoisting work, reduces construction difficulty, speeds up the integrity of an intermediate product in ship construction, and solves the problems of large sectional area occupied by the smoke box in the sectional assembly and large welding workload after the sectional assembly.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding technology, and specifically relates to an installation method for an exhaust system on a large container ship. Background Technology

[0002] During shipbuilding, the ship's exhaust system is designed to efficiently expel exhaust gases from diesel engines and boilers. The composition of the exhaust system varies depending on the type and size of the ship, but it generally includes accessories such as exhaust pipes and expansion joints (compensation pipes). Typically, the exhaust system of large container ships mainly consists of exhaust pipes and lower smoke boxes. Under normal circumstances, this exhaust system is assembled horizontally on a platform and then rotated 90° by a high-lift crane to be properly aligned with the hull structure. However, for ultra-large container ships, the smoke boxes and exhaust pipes are heavy, and the dimensions after horizontal assembly are large and irregular in shape. The high-lift crane has only one hook, making it difficult to complete the 90° rotation of the exhaust pipes and lower smoke boxes. Horizontal assembly is difficult and inefficient.

[0003] In the prior art, Chinese invention patent 202010517071.4 discloses a new method for installing a ship's main engine exhaust device in a chimney. Although this method changes the installation sequence of the exhaust pipe from horizontally pushing in section by section to hoisting in, the structure of the chimney hull is in a horizontal position during hoisting. This method cannot solve the problem that the smoke box and exhaust pipe of ultra-large container ships are heavy, large in size and irregular in shape after being closed in a horizontal position, and can complete the 90° turning of the exhaust pipe and the lower smoke box. Summary of the Invention

[0004] In view of the above, in order to reduce errors, facilitate operation, save manpower, reduce working hours, shorten the construction cycle, improve construction quality, and make the installation of exhaust devices for large container ships more efficient, this invention provides an installation method for exhaust devices for large container ships.

[0005] To achieve the objectives of the invention described above, the present invention adopts the following technical solution:

[0006] An installation method for an exhaust system on a large container ship, wherein the exhaust system is assembled between a lower hull structure and an upper hull structure, and the exhaust structure includes a smoke box, an exhaust pipe, and an expansion joint. One side of the expansion joint is connected to the smoke box via a flange, and the other side of the expansion joint is connected to the exhaust pipe via a flange. The smoke box includes a first large circular pipe and a second large circular pipe, the second large circular pipe being disposed below the outer side of the first large circular pipe and attached to the surface of the first large circular pipe. Symmetrical smoke box support seats are provided at the bottom of the smoke box. Lifting rings are symmetrically provided above the centers of gravity of the smoke box and the exhaust pipe, respectively. An inspection hole with a cover is provided at the bottom edge of the side of the smoke box. The installation method includes the following steps:

[0007] S1. Prepare two gantry fixtures and wooden blocks at the construction site. Place the smoke box support on the two gantry fixtures. Weld a lifting ring above the center of gravity of the smoke box. Place wooden blocks between the smoke box support and the gantry fixtures to prevent slipping and fix the smoke box. The smoke box is then placed in a normal position.

[0008] S2. The exhaust pipe is connected to the flange at one end of the expansion joint in a horizontal position, and a lifting ring is arranged on the exhaust pipe. After the exhaust pipe is connected to the expansion joint, it is rotated 90° by a crane and placed in a normal position. The exhaust pipe and the expansion joint are pre-assembled in a normal position.

[0009] S3. The expansion joint on the pre-installed exhaust pipe is normally connected to the smoke box, and the expansion joint on the exhaust pipe is matched and connected to the second large circular pipe of the smoke box through a flange.

[0010] S4. Install reinforcement at the outer edge of the expansion joint, and the exhaust device is now properly assembled.

[0011] S5. Hoist the exhaust device using a four-strand steel wire rope extending from a hook on a large lifting tool. Adjust the length of the steel wire rope, which connects the smoke box to the lifting ring on the exhaust pipe. With the smoke box and exhaust pipe in a normal horizontal position, position and assemble the exhaust device with the lower hull structure. Hoist the upper hull structure to the top of the exhaust device and perform segmented welding for positioning. The exhaust device installation is now complete.

[0012] In a more preferred embodiment, the height of the gantry fixture is greater than the distance from the bottom of the exhaust pipe to the lower edge of the exhaust pipe connecting flange.

[0013] A more preferred technical solution is that, in step S3, the outer edge of the expansion joint is reinforced with angle steel.

[0014] In a more preferred technical solution, there are four lifting rings, which are symmetrically arranged on the smoke box and exhaust pipe in the bow and stern directions of the ship. The lifting rings on the smoke box and exhaust pipe are all higher than the center of gravity of the overall structure of the exhaust device and are installed in the direction of the wire rope hook. The installation of the lifting rings is arranged in this manner, and the rated load of the lifting rings is 5 tons.

[0015] A more preferred technical solution is that a high-temperature resistant gasket is provided between the flanges at both ends of the expansion joint and the exhaust pipe and the smoke box.

[0016] In a more preferred embodiment, the top of the exhaust device is provided with a connecting flange for connecting to the upper hull structure.

[0017] A more preferred technical solution is that the inspection hole is a manhole that facilitates the entry and exit of personnel during installation, cleaning, and maintenance.

[0018] Based on the above technical solution, the installation method of the exhaust device for large container ships of the present invention has been applied in shipbuilding and has achieved the following technical effects:

[0019] This invention discloses an installation method for exhaust systems on large container ships. The process sequence of first assembling the smoke box, exhaust pipe, and expansion joint in a normal manner and then hoisting them ensures that the hoisting work is fast and efficient, reduces the construction difficulty, and accelerates the construction of the integrity of intermediate products of the ship.

[0020] This invention provides an installation method for exhaust systems on large container ships, which solves the problems of large area occupied by sections and large amount of welding work after assembly when the system is assembled in a horizontal manner. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the smoke box and exhaust pipe normally closed in an installation method for an exhaust system of a large container ship.

[0023] Figure 2 This is a schematic diagram of a smoke box structure for an installation method of an exhaust system for a large container ship.

[0024] Figure 3 This is a side view of a smoke box structure for an installation method of an exhaust system for a large container ship.

[0025] Figure 4 This is a side view of an expansion joint used in the installation method of an exhaust system for a large container ship.

[0026] The labels in the diagram are as follows:

[0027] 1-Smoke box, 2-Exhaust pipe, 3-Expansion joint, 4-Smoke box support, 5-Lifting ring, 6-Inspection hole, 7-Mass frame tooling, 8-Wooden block, 9-Reinforcement, 11-First large round tube, 12-Second large round tube, 13-Lower hull structure, 14-Upper hull structure Detailed Implementation

[0028] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0029] Marine exhaust systems are piping systems that remove exhaust gases generated during the operation of marine main engines, generators, and fuel-fired boilers. The function of marine exhaust systems is to smoothly discharge exhaust gases from diesel engines and boilers outside the ship. The composition of exhaust systems varies depending on the type and size of the ship, but generally consists of exhaust pipes, expansion joints, and exhaust smoke boxes. However, smoke boxes and exhaust pipes are heavy, and when assembled horizontally, they are large and irregularly shaped. Furthermore, high-lifting systems have only one hook, making it difficult to rotate them 90 degrees. Horizontal assembly is difficult to install and inefficient.

[0030] This invention provides an installation method for an exhaust system on a large container ship, aiming to solve the problem of the difficulty in installing the horizontal assembly of the exhaust system during the construction of ultra-large container ships. The exhaust system structure is as follows: Figure 1 As shown, the system includes a smoke box 1, an exhaust pipe 2, and an expansion joint 3. Flanges are provided on both sides of the expansion joint 3. One side of the expansion joint 3 is connected to the smoke box 1 via a flange, and the other side is connected to the exhaust pipe 2 via a flange. The exhaust pipe 2 is a large cylindrical bend, which, in its horizontal position, is matched and connected to the expansion joint 3 via a flange. Smoke box support seats 4 are symmetrically provided at the bottom of the smoke box 1. Four lifting rings 5 ​​are symmetrically arranged above the center of gravity of both the smoke box 1 and the exhaust pipe 2, arranged symmetrically in the bow-stern direction of the ship. On pipe 2, the lifting rings 5 ​​arranged on the smoke box 1 and the exhaust pipe 2 are all higher than the center of gravity of the overall structure of the exhaust device. The rated load of the lifting ring 5 is 5 tons. The lifting ring 5 is installed according to the direction of the wire rope hook. The gantry fixture 7 is a commonly used fixture for transporting sections. Its height is greater than the distance from the bottom of the exhaust pipe 1 to the lower edge of the connecting flange of the exhaust pipe 2. The smoke box 1 is placed on the two gantry fixtures 7 through the smoke box support 4. The gantry fixture 7 and the smoke box support 4 are connected by a wooden block 8. The exhaust pipe 2 and the smoke box 1 are connected by a reinforcing 9 around the outer edge of the expansion joint 3.

[0031] The expansion joint 3 is a corrugated expansion joint made of stainless steel. The allowable expansion and contraction of the expansion joint is greater than the thermal expansion of the pipe section. The lifting ring 4 must be set to ensure the symmetry of the center of gravity after the sections are closed. The expansion joint 3 consists of a bellows and two connecting pipes. It absorbs axial displacement through the flexible deformation of the bellows. The reinforcement 9 is to ensure the rigid support of the bellows during the ship's operation.

[0032] like Figure 2As shown, the cigarette box 1 is an intersecting component of two large circular tubes, including a first large circular tube 11 and a second large circular tube 12. The first large circular tube 11 is the main body of the cigarette box, and the second large circular tube 12 is located on the lower outer side of the first large circular tube 11 and attached to the surface of the first large circular tube 11. The first large circular tube 11 and the second large circular tube 12 intersect and join together, and the interior of the intersection of the first large circular tube 11 and the second large circular tube 12 is connected.

[0033] like Figure 3 As shown, the first large circular tube 11 has an inspection hole with a cover plate at the bottom edge of its side, which facilitates personnel observation and entry.

[0034] The top of the first large circular tube 11 is provided with a connecting flange, which connects to the upper hull structure 14, such as... Figure 4 As shown, after the exhaust device is positioned and assembled with the lower hull structure 13, the upper hull structure 13 is hoisted to the top of the exhaust device, and the segmented welding work is carried out to complete the installation of the exhaust device.

[0035] The present invention provides a method for installing exhaust systems on large container ships, comprising the following steps:

[0036] S1. Prepare two gantry fixtures 7 and wooden blocks 8 at the construction site. Place the smoke box support 4 on the two gantry fixtures 7. Weld a lifting ring 5 above the center of gravity of the smoke box 1. Place wooden blocks 8 between the smoke box support 4 and the gantry fixtures 7 for anti-slip fixation. The smoke box 1 is then placed in a normal position.

[0037] S2. The exhaust pipe 2 is connected to the flange at one end of the expansion joint 3 in a horizontal position, and a lifting ring 5 is arranged on the exhaust pipe 2. After the exhaust pipe 2 is connected to the expansion joint 3, it is rotated 90° by a crane and placed in a normal position. The exhaust pipe 2 and the expansion joint 3 are pre-installed in a normal position.

[0038] S3. The expansion joint 3 on the pre-installed exhaust pipe is normally connected to the smoke box 1, and the expansion joint 3 on the exhaust pipe is connected to the second large round pipe 12 of the smoke box 1 through a flange matching connection.

[0039] S4. Install reinforcement 9 at the outer edge of the expansion joint 3, and the exhaust device is now properly assembled.

[0040] S5. Hoist the exhaust device by using a hook on a large lifting tool to extend four steel wire ropes, adjust the length of the steel wire ropes, connect the smoke box 1 and the lifting ring 5 on the exhaust pipe 2, ensuring that the smoke box 1 and the exhaust pipe 2 are in a normal horizontal state, position and assemble the exhaust device with the lower hull structure 13, hoist the upper hull structure 14 to the top of the exhaust device, and perform segmented welding for positioning. The installation of the exhaust device is then complete.

[0041] This invention relates to an installation method for exhaust systems on large container ships. By first assembling the smoke box, exhaust pipe, and expansion joint in a normal configuration and then hoisting them, the method ensures rapid and efficient hoisting, reduces construction difficulty, and accelerates the construction of the integrity of intermediate ship components. It also solves the problems of large area occupied by sections and a large amount of welding work after assembly when assembling in a horizontal configuration.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An installation method for an exhaust device for a large container ship, the exhaust device being assembled between a lower hull structure (13) and an upper hull structure (14), the exhaust structure including a smoke box (1), an exhaust pipe (2) and an expansion joint (3), one side of the expansion joint (3) being connected to the smoke box (1) via a flange, and the other side of the expansion joint (3) being connected to the exhaust pipe (2) via a flange, the smoke box (1) including a first large circular pipe (11) and a second large circular pipe (12), the second large circular pipe (12) being disposed below the outer side of the first large circular pipe (11) and attached to the surface of the first large circular pipe (11), the bottom of the smoke box (1) being symmetrically provided with smoke box support seats (4), the smoke box (1) and the exhaust pipe (2) being symmetrically provided with lifting rings (5) above their respective centers of gravity, and a maintenance hole (6) with a cover plate being provided at the bottom edge of the side of the smoke box (1), characterized in that, The installation method includes the following steps: S1. Prepare two gantry fixtures (7) and wooden blocks (8) at the construction site. Place the smoke box support (4) on the two gantry fixtures (7). Weld a lifting ring (5) above the center of gravity of the smoke box (1). Place wooden blocks (8) between the smoke box support (4) and the gantry fixtures (7) for anti-slip fixation. The smoke box (1) is then placed in a normal position. S2. The exhaust pipe (2) is connected to the flange at one end of the expansion joint (3) in a horizontal position, and a lifting ring (5) is arranged on the exhaust pipe (2). After the exhaust pipe (2) is connected to the expansion joint (3), it is rotated 90° by a crane and placed in a normal position. The exhaust pipe (2) and the expansion joint (3) are pre-installed in a normal position. S3. The expansion joint (3) on the pre-installed exhaust pipe (2) is normally connected to the smoke box (1), and the expansion joint (3) on the exhaust pipe (2) is connected to the second large round pipe (12) of the smoke box (1) through a flange. S4. Install reinforcement (9) at the outer edge of the expansion joint (3), and the exhaust device is assembled normally. S5. Hoist the exhaust device by using a hook on a large hoisting tool to extend four steel wire ropes, adjust the length of the steel wire ropes, connect the smoke box (1) and the exhaust pipe (2) with the lifting ring (5), and ensure that the smoke box (1) and the exhaust pipe (2) are in a normal horizontal state. Position and assemble the exhaust device with the lower hull structure (13), hoist the upper hull structure (14) to the top of the exhaust device, and perform segmented welding for positioning. The exhaust device is then installed. The height of the gantry fixture (7) is greater than the distance from the bottom of the exhaust pipe (2) to the lower edge of the connecting flange of the exhaust pipe (2); There are 4 lifting rings (5), which are symmetrically arranged on the smoke box (1) and the exhaust pipe (2) in the bow and stern directions of the ship. The lifting rings (5) on the smoke box (1) and the exhaust pipe (2) are all higher than the center of gravity of the overall structure of the exhaust device and are installed in the direction of the wire rope hook. The expansion joint (3) has flanges at both ends that connect the exhaust pipe (2) and the smoke box (1) and are provided with high-temperature resistant gaskets.

2. The installation method for an exhaust system on a large container ship according to claim 1, characterized in that, In step S4, the outer edge of the expansion joint (3) is reinforced with angle steel.

3. The installation method for an exhaust system on a large container ship according to claim 1, characterized in that, The rated load of the lifting ring (5) is 5 tons.

4. The installation method for an exhaust system on a large container ship according to claim 1, characterized in that, The top of the exhaust device is provided with a connecting flange, which connects to the upper hull structure (14).

5. The installation method for an exhaust system on a large container ship according to claim 1, characterized in that, The inspection hole (6) is a hole that allows staff to enter and exit during installation, cleaning, and maintenance.

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