A method for installing a large air inlet pipe in a limited space on a ship

Abstract

The present invention relates to a method for installing a large air intake duct in a confined space on a ship, comprising the steps of fabricating and installing a through-tank welded base plate; installing a closing pipe; fabricating a lofted pipe and four sealing plates, and providing a construction process hole in the lofted pipe; a construction worker drilling into the lofted pipe and securely connecting the lofted pipe to the through-tank welded base plate through the construction process hole; installing the four sealing plates onto the four construction process holes, respectively, and climbing along the lofted pipe to exit the flange opening. The present invention's method for installing a large air intake duct in a confined space on a ship not only solves the pipe installation problem but also ensures the pipe's tightness, ensuring adequate air intake and preventing leakage, thereby increasing the effectiveness of the pipe installation.

Description

Technical Field

[0001] The present invention relates to the field of shipbuilding, and in particular to a method for installing a large air inlet pipe in a limited space of a ship. Background Art

[0002] Ships have a complex piping system, requiring a variety of connection methods. Flange connections are the most common. Equipment air inlet ducts are large, and given the required air volume, they often utilize large-diameter rectangular ducts, measuring 800mm x 600mm. However, space on board is extremely limited. To maximize pipe installation efficiency, large quantities of pre-lofted pipes must be produced in the infield workshop. However, in complex cabin spaces, at hull structure junctions, and where pipes pass through multiple decks and bulkheads, pipe connections often require the addition of one or two adjustable angles, lengths, and corners. This allows for the inability to connect the flanges of the lofted pipes due to construction errors, such as pipe fabrication errors, hull bulkhead openings, and hull structure welding deformation. However, due to limited space in horizontal ducts, installation crews often cannot access the ducts where the lofted and folded pipes connect. Summary of the Invention

[0003] In order to solve the technical problems existing in the prior art, the present invention provides a method for installing a large air inlet duct in a limited space of a ship, so as to solve the problem of insufficient installation space for large air inlet ducts in narrow spaces (such as small air ducts, cabins, etc.) and multi-layer deck through-cabins.

[0004] To achieve the above object, the technical solutions of the present invention are as follows:

[0005] A method for installing a large air inlet duct in a confined space of a ship, wherein the confined space includes two vertical air ducts and a horizontal air duct passing through the ship's bulkhead, wherein the two vertical air ducts are perpendicular to and connected to both ends of the horizontal air duct, respectively. The method comprises the following steps:

[0006] Step 1: Make a through-cabin welding base plate that matches the outer diameter of the air inlet pipe, with the middle of the through-cabin welding base plate hollowed out, and fix the through-cabin welding base plate to the bulkhead of the ship;

[0007] Step 2: According to the three-dimensional coordinate position of the through-cabin welding base plate, the closing pipe is hoisted into the vertical air duct, the closing pipe is passed through the hollow part of the through-cabin welding base plate, the length margin of the closing pipe is cut, and the outer periphery of the closing pipe is fixed to the hollow part of the through-cabin welding base plate;

[0008] Step 3: Make a lofting pipe and four sealing plates according to the design drawings. Both ends of the lofting pipe are equipped with flanges. Construction process holes are opened on the four sides of the pipe wall at one end of the lofting pipe and polished and smoothed.

[0009] Step 4: Hoist the lofting pipe into the horizontal air duct, and fix the flange at one end of the lofting pipe to the through-cabin welding base plate through the construction process hole of the lofting pipe, and fix the flange at the other end of the lofting pipe to the air inlet pipe;

[0010] Step 5: Install the four sealing plates onto the four construction process holes respectively.

[0011] As an optimal technical solution, a plurality of screw holes are provided on the through-cabin welding base plate. In step four, the flange of the lofting pipe at the end away from the air inlet pipe is connected to the through-cabin welding base plate by a plurality of bolts. The screw holes correspond to the bolts one by one, and the screw holes are provided with threads matching the bolts.

[0012] As an optimal technical solution, construction workers enter the layout pipe and install bolts between the layout pipe and the cabin welding seat plate from the construction process hole. After installing the sealing plate, the construction workers climb out along the layout pipe.

[0013] As a preferred technical solution, both the lofting tube and the closing tube are L-shaped.

[0014] As a preferred technical solution, in step five, the sealing plate is welded to the construction process holes on the inner wall around the layout pipe.

[0015] As an optimal technical solution, in step five, a fixed seat plate is welded at the construction process holes on the inner wall around the layout tube, and a threaded hole is provided on the fixed seat plate. The sealing plate is connected to the fixed seat plate by screws passing through the threaded holes, and the threaded holes are provided with threads matching the screws.

[0016] As a preferred technical solution, a sealing gasket is provided at the connection between the sealing plate and the fixed seat plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The method of the present invention for installing a large air inlet pipe in a limited space of a ship not only solves the problem of pipe installation, but also ensures the sealing of the pipe to ensure the air intake volume without pipeline leakage, thereby increasing the effectiveness of pipeline installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the operation of a method for installing a large air inlet duct in a limited space of a ship according to the present invention;

[0020] Figure 2 This is a structural schematic diagram of a through-cabin welding seat plate in a method for installing a large air inlet duct in a limited space of a ship according to the present invention;

[0021] Figure 3 The present invention is a schematic diagram of the installation of a sealing plate in a method for installing a large air inlet duct in a limited space on a ship.

[0022] In the figure: 1. Air inlet pipe; 2. Deck; 3. Horizontal air duct; 4. Bulkhead; 5. Through-cabin welding base plate; 6. Closing pipe; 7. Lofting pipe; 71. Construction process hole; 72. Bolt; 8. Closing plate; 9. Screw; 10. Fixed base plate. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below in conjunction with specific embodiments:

[0024] like Figure 1 As shown, in this embodiment, the air inlet pipe 1 is a rectangular square tube with a specification of 800mm*600*6mm. Since the air inlet pipe 1 needs to pass through several decks 2 and several bulkheads 4 in the horizontal air duct 3 when it is installed, the design of the pipe layout is relatively complicated. The installation area space of the horizontal air duct 3 in the figure is limited. After the horizontal layout pipe 7 and the closing pipe 6 are hoisted into place, the pipe installation position is very close to the bulkheads 4 in the upper, lower, left and right areas. The construction space is narrow and the construction workers cannot enter the horizontal air duct 3 to weld the through-cabin welding seat plate 5 and install the bolts 72 of the connecting flange. In order to facilitate the construction workers to weld the through-cabin welding seat plate 5 and install the flange connecting bolts 72, a method for installing a large air inlet pipe 1 in a limited space on a ship is provided. The limited space includes two vertical air ducts and a horizontal air duct 3 that passes through the ship's bulkhead 4. The two vertical air ducts are perpendicular to and connected to the two ends of the horizontal air duct 3 respectively. The method includes the following steps:

[0025] Step 1, such as Figure 2 As shown, a through-cabin welding base plate 5 is made to match the outer diameter of the air inlet pipe 1. In this embodiment, the through-cabin welding base plate 5 is made of a rectangular plate with a size of 900mm*700mm*30mm. The through-cabin welding base plate 5 is hollowed out in the middle. A hole is drilled and internally threaded on the side of the through-cabin welding base plate 5 close to the air inlet pipe 1, and the through-cabin welding base plate 5 is fixed to the bulkhead 4 of the ship.

[0026] Step 2: Based on the three-dimensional coordinate position of the through-cabin welding base plate 5, the L-shaped closing pipe 6 is hoisted into the vertical air duct. The horizontal end of the closing pipe 6 passes through the hollow portion of the through-cabin welding base plate 5. The size of the hollow portion of the through-cabin welding base plate 5 matches the outer diameter of the horizontal end of the closing pipe 6. The length margin of the closing pipe 6 passing through the hollow portion is cut. The closing pipe 6 and the through-cabin welding base plate 5 are welded together. After the closing pipe 6 is assembled and welded, it is polished.

[0027] Step 3: According to the design drawings, make an L-shaped lofting tube 7 and four closing plates 8. Both ends of the lofting tube 7 are provided with flanges. A construction process hole 71 is opened on the four sides of the tube wall at one end of the lofting tube 7 and polished and smoothed. In this embodiment, the upper and lower plates of the lofting tube 7 have rectangular holes of 500m*350mm, and the left and right plates have rectangular holes of 400mm*350mm. After the holes are opened, they are polished and smoothed.

[0028] Step 4: Hoist the layout pipe 7 into the horizontal air duct 3. At this time, since the closing pipe 6 and the layout pipe 7 are already in place in the horizontal air duct 3, the construction space is very limited. The staff needs to enter the layout pipe 7 and install the bolts 72 between the layout pipe 7 flange and the through-cabin welding seat plate 5 from the construction process hole 71. The screw holes on the through-cabin welding seat plate 5 correspond to the bolts 72 one by one, and the screw holes are provided with threads that match the bolts 72. After installing the closing plate 8, the construction staff climb out along the layout pipe 7. The flange at one end of the layout pipe 7 is fixedly connected to the through-cabin welding seat plate 5 through the construction process hole 71 of the layout pipe 7, and the flange at the other end of the layout pipe 7 is fixedly connected to the air inlet pipe 1;

[0029] Step five: install four sealing plates 8 on the four construction process holes 71 respectively. In this embodiment, the size of the sealing plates 8 on the upper and lower sides is 600mm*450mm*10mm, and the size of the sealing plates 8 on the left and right sides is 500mm*450mm*10mm.

[0030] In step five, if Figure 3 As shown, there are two ways to connect the sealing plate 8 and the construction process hole 71. One is to weld the sealing plate 8 directly to the construction process hole 71 on the inner wall around the layout tube 7, and then polish it clean. The other is to weld the fixing plate 10 to the construction process hole 71 on the inner wall around the layout tube 7. The fixing plate 10 is provided with threaded holes. The sealing plate 8 is connected to the fixing plate 10 by screws 9 passing through the threaded holes. The threaded holes are provided with threads matching the screws 9. This method adopts a flexible and detachable connection method. If necessary, a sealing gasket made of canvas or rubber can be placed at the connection between the sealing plate 8 and the fixing plate 10 to improve the sealing performance.

[0031] This embodiment is only a further explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A method for installing a large air inlet duct in a confined space of a ship, wherein the confined space includes two vertical air ducts and a horizontal air duct passing through the ship's bulkhead, wherein the two vertical air ducts are perpendicular to and connected to both ends of the horizontal air duct, characterized in that: The method comprises the following steps: Step 1: Make a through-cabin welding base plate that matches the outer diameter of the air inlet pipe, with the middle of the through-cabin welding base plate hollowed out, and fix the through-cabin welding base plate to the bulkhead of the ship; Step 2: According to the three-dimensional coordinate position of the through-cabin welding base plate, the closing pipe is hoisted into the vertical air duct, the closing pipe is passed through the hollow part of the through-cabin welding base plate, the length margin of the closing pipe is cut, and the outer periphery of the closing pipe is fixed to the hollow part of the through-cabin welding base plate; Step 3: Make a lofting tube and four sealing plates according to the design drawings. Both ends of the lofting tube are provided with flanges. Construction process holes are opened on the four sides of the tube wall at one end of the lofting tube and polished and smoothed. Step 4: hoist the lofting pipe into the horizontal air duct, and fix the flange at one end of the lofting pipe to the through-cabin welding base plate through the construction process hole of the lofting pipe, and fix the flange at the other end of the lofting pipe to the air inlet pipe; Step 5: Install the four sealing plates onto the four construction process holes respectively.

2. A method for installing a large air inlet pipe in a limited space of a ship according to claim 1, characterized in that: The through-cabin welding seat plate is provided with a plurality of screw holes. In the step four, the flange of the lofting pipe at one end away from the air inlet pipe is connected to the through-cabin welding seat plate by a plurality of bolts. The screw holes correspond to the bolts one by one, and the screw holes are provided with threads matching the bolts.

3. A method for installing a large air inlet pipe in a limited space of a ship according to claim 2, characterized in that: The construction workers enter the layout pipe and install the bolts between the layout pipe and the cabin welding seat plate from the construction process hole. After installing the sealing plate, the construction workers climb out along the layout pipe.

4. The method for installing a large air inlet pipe in a limited space of a ship according to claim 1, characterized in that: The lofting tube and the closing tube are both L-shaped.

5. The method for installing a large air inlet pipe in a limited space of a ship according to claim 1, characterized in that: In the step five, the sealing plate is welded to the construction process holes on the inner wall around the lofting pipe.

6. The method for installing a large air inlet pipe in a limited space of a ship according to claim 1, characterized in that: In step five, a fixed seat plate is welded at the construction process holes on the inner wall around the layout tube, and a threaded hole is provided on the fixed seat plate. The sealing plate is connected to the fixed seat plate by a screw passing through the threaded hole, and the threaded hole is provided with a thread matching the screw.

7. A method for installing a large air inlet pipe in a limited space of a ship according to claim 6, characterized in that: A sealing gasket is provided at the connection between the sealing plate and the fixed seat plate.

Images