Drainage system and expansion joint manufacturing method for LNG bunkering ship deck

Abstract

The present invention discloses a drainage system and a method for manufacturing an expansion joint for an LNG bunkering ship deck. The drainage system comprises: a first fairlead hole, which is installed on the deck near the outer plate; a second fairlead hole, which is installed on the deck near the outer plate, and the second fairlead hole and the first fairlead hole are arranged on the same side of the deck; an expansion joint, which is arranged between the first fairlead hole and the second fairlead hole, and is bowl-shaped; a first water-blocking flat iron; a second water-blocking flat iron; and a downpipe. The beneficial effects of the present invention are that the oil and water on the deck can be prevented from flowing directly from the edge of the outer plate to the outside of the ship, causing damage to the outer plate paint, and the expansion joint effectively prevents the flat iron from participating in the total longitudinal strength. Through the forward rolling and reverse rolling methods of cold bending processing proposed by the present invention, the processing and manufacturing of the bowl-shaped expansion joint can also be quickly realized.

Description

Technical Field

[0001] The invention belongs to the technical field of shipbuilding, and in particular relates to a drainage system of a deck of an LNG bunkering ship and a method for manufacturing an expansion joint. Background Art

[0002] Due to the presence of deck machinery on the deck of the LNG bunkering ship, these machines and equipment will inevitably leak oil during the ship's operation phase. In order to prevent the leaked lubricating oil from flowing into the sea and causing pollution, it is necessary to install water-blocking flat irons on the deck.

[0003] The common water-blocking flat iron is a structural part, as a part of the outer plate, and is generally installed at the deck tongue and groove. However, due to shipowner requirements and other reasons, some water-blocking flat irons are located on the deck inside the outer plate. Since the water-blocking flat iron on the deck is relatively long, it will inevitably participate in the total longitudinal bending of the ship. In order to prevent the water-blocking flat iron from becoming unstable, the water-blocking flat iron needs to be of larger specifications. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a drainage system for the deck of an LNG bunkering ship and a method for manufacturing an expansion joint. The present invention can use the expansion joint to prevent the water-blocking flat iron from participating in the total longitudinal strength of the ship, thereby eliminating the need for large-sized flat irons and saving materials.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A drainage system and expansion joint manufacturing method for a deck of an LNG bunkering ship, the drainage system comprising: a first fairlead hole, the first fairlead hole being installed at a position on the deck close to an outer plate; a second fairlead hole, the second fairlead hole being installed at a position on the deck close to an outer plate, the second fairlead hole and the first fairlead hole being arranged on the same side of the deck; an expansion joint, the expansion joint being arranged between the first fairlead hole and the second fairlead hole, the expansion joint being bowl-shaped; a first water-blocking flat iron, one end of the first water-blocking flat iron being connected to the first fairlead hole, the other end of the first water-blocking flat iron being connected to a first end of the expansion joint; a second water-blocking flat iron, one end of the second water-blocking flat iron being connected to the second fairlead hole, the other end of the second water-blocking flat iron being connected to a second end of the expansion joint; and

[0007] The downpipe is in a "J" shape, the first end of the downpipe is arranged close to the second water-blocking flat iron on the side close to the midship, and the second end of the downpipe passes through the inside of the hull and the outer plate of the hull to communicate with the outside of the hull.

[0008] Preferably, a check valve is also provided in the second end of the downpipe.

[0009] Preferably, a web is further provided at the outer hull plate through which the second end of the downpipe passes.

[0010] Preferably, the web has a thickness of 15 mm to 20 mm and is in a circular ring shape to prevent drainage from contaminating the outer plate of the hull.

[0011] Preferably, the expansion and expansion joint is formed by cold bending a steel plate, and the arc length of the upper portion of the expansion and expansion joint is greater than the arc length of the lower portion.

[0012] Preferably, the thickness of the steel plate used to make the expansion expansion joint is 10mm-15mm, the upper radius of the expansion expansion joint is 150mm, the lower radius of the expansion expansion joint is 100mm, and the height of the expansion expansion joint is 150mm-200mm.

[0013] Preferably, the height of the first water-blocking flat iron and the second water-blocking flat iron is 150mm-200mm, and the thickness is 10mm-15mm.

[0014] Preferably, the first water-blocking flat iron is arranged flush with the outer side of the base of the first fairlead.

[0015] Preferably, the first fairlead is adjacent to the second fairlead.

[0016] The present invention also provides a method for manufacturing an expansion expansion joint, wherein the expansion expansion joint is arranged between the first fairlead hole and the second fairlead hole, and the expansion expansion joint is bowl-shaped. The manufacturing method comprises the following steps:

[0017] Step 1: performing a first cold bending process on the upper and lower edges of a first predetermined area in the middle of the plate;

[0018] Step 2: Use the sample to check the sample accuracy. If the accuracy meets the design requirements, proceed to the next step. If the accuracy does not meet the design requirements, proceed to step 1.

[0019] Step 3: Perform a second cold bending process on the second predetermined areas on both sides of the plate, wherein the bending direction of the plate formed by the second cold bending process is opposite to the bending direction of the plate formed by the first cold bending process.

[0020] The first cold bending process adopts rolling cold pressing process, and uses a hydraulic press to roll the angle. The center line of the formed bowl-shaped structure is greater than or equal to 300mm away from the two ends of the expansion joint. The angle formed by the second cold bending process is between 20° and 30°.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. Through the drainage system involved in this case, the water-blocking flat iron can play its own role without participating in the overall longitudinal strength of the ship. At the same time, the downpipe system can also drain oil and water without affecting the deck paint;

[0023] 2. During the block manufacturing stage or the general assembly stage of the ship, the expansion joints, water blocking flat irons and fairleads can be installed and welded on the deck during the block manufacturing. During the block manufacturing, the deck downpipes can be installed to complete the layout and installation of the entire drainage system. Once the ship is manufactured or once it is in a normal state, the entire drainage system can function;

[0024] 3. Due to the design of the ship's beam arch, the middle of the ship is higher than the side of the ship. Due to the effect of gravity, the water on the deck will flow from the middle of the ship to the sides of the ship. Through the water-blocking flat iron, the fairlead hole and the deck downpipe system provided by the present invention, the water falling on the deck due to rain or the like can be smoothly discharged out of the ship;

[0025] 4. The forward rolling and reverse rolling methods of cold bending processing proposed by the present invention can also quickly realize the processing and manufacturing of bowl-shaped expansion joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a top view of the present invention.

[0028] Figure 2 Detailed diagram of the expansion joint of the present invention, wherein a is a side view and b is a top view.

[0029] Figure 3 It is the detailed drawing of the expansion and processing of the expansion joint.

[0030] Figure 4 This is a schematic diagram of using a sample to check sample accuracy in step 2.

[0031] Figure 5 It is a lateral view of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] like Figure 1-5 As shown, this embodiment provides a drainage system and a method for manufacturing an expansion joint for an LNG bunkering ship deck, wherein the drainage system comprises: a first fairlead hole 1, which is installed on the deck near the outer plate 9; a second fairlead hole 5, which is installed on the deck near the outer plate 9, and the second fairlead hole 5 and the first fairlead hole 1 are arranged on the same side of the deck; an expansion joint 3, which is arranged between the first fairlead hole 1 and the second fairlead hole 5, and the expansion joint 3 is bowl-shaped, specifically, a half bowl shape without a bottom surface; a first barrier A water flat iron 2, one end of the first water flat iron 2 is connected to the first fairlead 1, and the other end of the first water flat iron 2 is connected to the first end of the expansion joint 3; a second water flat iron 4, one end of the second water flat iron 4 is connected to the second fairlead 5, and the other end of the second water flat iron 4 is connected to the second end of the expansion joint 3; and a downpipe 6, the downpipe 6 is "J" shaped, the first end of the downpipe 6 is set close to the second water flat iron 4 near the side of the midship, and the second end of the downpipe 6 passes through the inside of the hull and passes through the hull outer plate 9 to communicate with the outside of the hull. The fairlead, also known as the "bulwark cable hole", is a closed-hole fairlead set on the bulwark to limit the cable lead-out position, which is a circular or elliptical annular casting. The fairlead is usually made of cast iron or cast steel, installed on the bulwark, guides the cable through the hull, and prevents the cable from damaging the hull. The arc-shaped downpipe pipe is designed to prevent oil and water from flowing directly along the outer plate and damaging the outer plate paint.

[0035] A check valve 8 is also provided in the second end of the downpipe 6. A check valve is a valve whose opening and closing part is a circular valve disc and which acts by its own weight and medium pressure to block the backflow of the medium. It belongs to the automatic valve category and is also called a non-return valve, a one-way valve, a reflux valve or an isolation valve.

[0036] A web 7 is also provided at the hull outer plate 9 through which the second end of the downpipe 6 passes.

[0037] The web 7 has a thickness of 15 mm to 20 mm and is in a circular ring shape, and is used to prevent drainage from contaminating the outer hull 9 .

[0038] The expansion joint 3 is formed by cold bending of steel plates, and the arc length of the upper part of the expansion joint 3 is greater than the arc length of the lower part. Cold bending is a metal processing method. Metal plates and strips are mechanically bent into profiles of a certain shape and size at room temperature. The product is called cold-bent profile. The advantages of cold bending are: it can produce various ultra-thin, ultra-wide and complex-shaped profiles that cannot be produced by rolling; it saves metal materials; and the product has good mechanical properties. Common processing methods include roll bending, press bending, drawing bending and bending.

[0039] The thickness of the steel plate used to make the expansion joint 3 is 10mm-15mm, the upper radius of the expansion joint 3 is 150mm, the lower radius of the expansion joint 3 is 100mm, and the height of the expansion joint 3 is 150mm-200mm.

[0040] The height of the first water blocking flat iron 2 and the second water blocking flat iron 4 is 150mm-200mm, and the thickness is 10mm-15mm.

[0041] The first water-blocking flat iron 2 is arranged flush with the outer side of the base of the first fairlead 1 .

[0042] The first fairlead 1 is adjacent to the second fairlead 5 .

[0043] The expansion joint is arranged between the first fairlead hole and the second fairlead hole, and the expansion joint is bowl-shaped. The manufacturing method comprises the following steps:

[0044] Step 1: performing a first cold bending process on the upper side 311 and the lower side 312 of the first predetermined area 31 in the middle of the plate;

[0045] Step 2: Use the sample 32 to check the sample accuracy. If the accuracy meets the design requirements, proceed to the next step. If the accuracy does not meet the design requirements, proceed to step 1.

[0046] Step 3: Perform a second cold bending process on the second predetermined areas 33 on both sides of the plate. The bending direction of the plate formed by the second cold bending process is opposite to the bending direction of the plate formed by the first cold bending process.

[0047] The first cold bending process adopts rolling cold pressing process, and the distance between the center line 313 of the formed bowl-shaped structure and the two ends of the expansion joint is greater than or equal to 300mm. The angle formed by the second cold bending process is between 20° and 30°.

[0048] The water-blocking flat iron is an ordinary flat iron of a certain thickness, which plays the role of intercepting rainwater, waves and oil on the deck. The height of the flat iron is 150mm~200mm, and the thickness is generally 10mm~15mm.

[0049] In the present invention, the water blocking flat iron is divided into two pieces, one side of the first water blocking flat iron is connected to the fairlead hole, and the other side is connected to the expansion joint. One side of the second water blocking flat iron is connected to the expansion joint, and the other side is connected to the fairlead hole.

[0050] Due to the requirements of ship mooring, a fairlead hole is set at every interval, and the water-blocking flat iron can be installed on the base of the fairlead hole. Since the fairlead hole is generally flush with the outer surface of the hull, the distance between the base and the outermost side of the outer plate is also about 100mm to 150mm. Therefore, the water-blocking flat iron can be set on the outside of the fairlead hole base, flush with the base.

[0051] The expansion joint plays a role in preventing the water-blocking flat iron from participating in the total longitudinal strength. The expansion joint is a curved bowl-shaped structure formed by bending a steel plate through cold working. The cold bending process makes it unstable, so the entire water-blocking flat iron cannot participate in the total longitudinal strength of the ship. Then the water-blocking flat iron does not need to use a larger specification, and no additional reinforcement measures are required. The height of the expansion joint is 150mm~200mm. In order to facilitate cold bending, the thickness can be slightly smaller than the water-blocking flat iron, but the general thickness is also 10mm~15mm. Due to the bowl-shaped design requirements, the radius of the expansion joint is different on the upper and lower surfaces. Generally, the lower surface has a smaller radius, while the upper surface has a larger radius. In order to consider the operability of cold bending and water-fire bending, the radius of the lower surface can be set to about R100mm, and the radius of the upper surface can be set to about R150mm.

[0052] Since the expansion joint 3 is bowl-shaped, the processing method of this part is relatively complicated and cannot be achieved by bending a flat iron. Instead, it needs to be achieved by forward rolling and reverse rolling using a steel plate according to the shape formed by lofting.

[0053] The principle of hull parts forming is to use the plastic properties of steel metal at room temperature when external forces are applied, that is, the stamping, shearing, formability and shapeability to achieve the purpose of forming. In other words, the essence of cold bending is to use external forces to act on the workpiece to cause irreversible plastic residual deformation of the workpiece. After cold working, the material will produce cold work hardening, which will increase the strength and reduce the plasticity. The effect of this cold work hardening decreases with the increase of the distance from the processing area. For general hull structural steel, when the bending radius is greater than 10 times the thickness of the plate, the change in the mechanical properties of the material does not affect the performance of the product.

[0054] In order to realize the bowl-shaped design, the upper and lower sides of the plate need to be cold-bent first, and the angles need to be rolled using a hydraulic press. The bent shape is unfolded. According to the radius of the circle, the arc of the circle can be obtained, and the arc is the unfolding value of the part. After the part is unfolded, it becomes a fan-shaped plate, which is obtained by rolling and cold-pressing the upper and lower openings respectively. To ensure smooth processing, the length of the part from the center line of the bowl to the weld must be greater than 300mm. During processing, in order to ensure the processing accuracy and the degree of sample, the upper and lower openings need to be processed by the processing template 32 (positive rolling). After each angle is rolled, the sample accuracy is checked with the template 32. Then, at the position where the water-blocking flat irons 2 and 4 are connected, the cold bending process is also used to roll the angle (reverse rolling). According to the operating technical specifications for the angle rolling of the plate, the angle required for the angle rolling can be between 20° and 30°.

[0055] The deck downpipe system consists of a deck downpipe and a downpipe belly plate. The deck downpipe is located on the side of the water-blocking flat iron near the midship, in a J-shape, and is discharged directly from the deck to the hull. A one-way check valve is set near the outer plate to prevent the backflow of seawater when the ship is fully loaded or tilted. At the same time, a belly plate is set at the outer plate, which is 15mm higher than the outer plate. The water on the deck can be beaten down to the outside of the hull due to gravity. Due to the J-shaped design, the water or oil on the deck can flow down by gravity, and at the discharge port, it can maintain a certain inertia to flow outward, effectively preventing oil and water from damaging the deck paint. The opening position of the deck downpipe at the outer plate, the size of the pipe opening and the wall thickness of the pipe should be determined comprehensively according to the summer load line position and the height of the freeboard deck specified in the specification. For general large ships, the outer plate opening without overtime dressing is 3m to 5m away from the freeboard deck, the pipe opening is about 200mm, and the wall thickness is not less than 6mm.

[0056] Although the above embodiments have been described in detail for the present invention, it should be understood by those skilled in the art that modifications or improvements may be made based on the contents disclosed in the present invention without departing from the spirit and scope of the present invention, and such modifications and improvements are within the spirit and scope of the present invention.

Claims

1. The drainage system of the LNG bunkering ship deck is characterized by: The drainage system comprises: A first fairlead hole (1), the first fairlead hole (1) being installed on the deck close to the outer plate; a second fairlead hole (5), the second fairlead hole (5) being installed on the deck close to the outer plate, the second fairlead hole (5) and the first fairlead hole (1) being arranged on the same side of the deck, the first fairlead hole (1) being adjacent to the second fairlead hole (5); An expansion expansion joint (3), the expansion expansion joint (3) being arranged between the first fairlead hole (1) and the second fairlead hole (5), the expansion expansion joint (3) being bowl-shaped; a first water retaining flat iron (2), one end of the first water retaining flat iron (2) being connected to the first fairlead (1), and the other end of the first water retaining flat iron (2) being connected to a first end of the expansion joint (3); a second water retaining flat iron (4), one end of the second water retaining flat iron (4) being connected to the second fairlead hole (5), and the other end of the second water retaining flat iron (4) being connected to the second end of the expansion joint (3); and A downpipe (6), the downpipe (6) being in a "J" shape, the first end of the downpipe (6) being arranged close to the side of the second water-blocking flat iron (4) close to the midship, and the second end of the downpipe (6) passing through the interior of the hull, through the hull outer plate (9), and communicating with the exterior of the hull; A check valve (8) is also provided in the second end of the downpipe (6); A web plate (7) is also provided at the hull outer plate (9) through which the second end of the downpipe (6) passes; The method for making an expansion joint comprises the following steps: Step 1: performing a first cold bending process on the upper side (311) and the lower side (312) of the first predetermined area (31) in the middle of the plate; Step 2: Use the sample (32) to check the sample accuracy. If the accuracy meets the design requirements, proceed to the next step. If the accuracy does not meet the design requirements, proceed to step 1. Step 3: performing a second cold bending process on the second predetermined areas (33) on both sides of the plate, wherein the bending direction of the plate formed by the second cold bending process is opposite to the bending direction of the plate formed by the first cold bending process.

2. The drainage system for the deck of the LNG bunkering ship according to claim 1, characterized in that: The web (7) has a thickness of 15 mm to 20 mm and is in a circular ring shape, and is used to prevent drainage from contaminating the hull outer plate (9).

3. The drainage system for the deck of the LNG bunkering ship according to claim 1, characterized in that: The expansion and expansion joint (3) is formed by cold bending a steel plate, and the arc length of the upper part of the expansion and expansion joint (3) is greater than the arc length of the lower part.

4. The drainage system for the deck of the LNG bunkering ship according to claim 3, characterized in that: The thickness of the steel plate used to make the expansion expansion joint (3) is 10 mm-15 mm, the upper radius of the expansion expansion joint (3) is 150 mm, the lower radius of the expansion expansion joint (3) is 100 mm, and the height of the expansion expansion joint (3) is 150 mm-200 mm.

5. The drainage system for the deck of the LNG bunkering ship according to claim 1, characterized in that: The first water-blocking flat iron (2) and the second water-blocking flat iron (4) have a height of 150 mm to 200 mm and a thickness of 10 mm to 15 mm.

6. The drainage system for the deck of the LNG bunkering ship according to claim 1, characterized in that: The first water-blocking flat iron (2) is arranged flush with the outer side of the base of the first fairlead (1).

7. The drainage system for the deck of the LNG bunkering ship according to claim 1, characterized in that: The first cold bending process adopts rolling cold pressing process, and the distance between the center line (313) of the formed bowl-shaped structure and the two ends of the expansion joint is greater than or equal to 300mm, and the angle formed by the second cold bending process is between 20° and 30°.

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