A method of assembling a ship hull conversion tank type coaming

Abstract

The present application relates to the technical field of shipbuilding methods, and particularly relates to a ship hull refitting groove type coaming assembly method. The ship hull refitting groove type coaming assembly method comprises the following steps: firstly, transporting each component of the groove type coaming to a position to be installed; then, welding and connecting a coaming on one side and a horizontal transition plate corresponding to the coaming on the deck; then, welding a plurality of groove type plates on the horizontal transition plate; finally, welding and connecting a coaming on the other side and a horizontal transition plate corresponding to the coaming on the deck and the groove type plates. Since the components are installed separately, the components are convenient to transport, and the components can avoid colliding with the cabin side wall during the transportation process. The components are installed in one time, and the strength during the transportation and transfer is not considered. The components do not need to be additionally welded and detached from the support, and thus the problems that the groove type coaming is assembled into a shape outside the cabin, the assembled groove type coaming is hoisted into the cabin, the groove type coaming is easily collided with the cabin wall and is interfered, and the operation is complicated in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shipbuilding methods, in particular to a ship hull modification groove type coaming assembly method. BACKGROUND

[0002] In the existing ship modification or repair project, there is a process of installing coaming in the cabin. Generally, coaming has two types of flat and groove, and groove type coaming needs to use groove type plate, as shown in the figure, the groove type plate has a flat plate surface and a concave and convex groove surface on the other side, and the groove extends vertically when used as coaming. Because the groove type coaming has higher structural strength, it has a large number of applications. Generally, as shown in the figure, the groove type coaming includes a groove type plate 3 as the main body, an upper coaming 1 located at the upper end of the groove type plate 3, and a lower coaming 5 located at the lower end of the groove type plate 3. An upper end horizontal transition plate 2 is arranged between the upper coaming 1 and the groove type plate 3, and a lower end horizontal transition plate 4 is arranged between the lower coaming 5 and the groove type plate 3. The two horizontal transition plates are sealed on the end face of the groove type plate 3, and the width of the horizontal transition plate is not less than the thickness of the groove type plate 3, so that the grooves at the end of the groove type plate are completely sealed when assembled into the groove type coaming. Because the coaming generally has a large area, the groove type plate is often divided into blocks and arranged left and right. When in use, the upper coaming, the upper end horizontal transition plate, the groove type plate, the lower end horizontal transition plate and the lower coaming are first welded into a whole outside, and then the whole is hoisted into the cabin to be used for installation. Figure 1 Figure 2 In the above technical solution, because it is a modification of the ship, there may be a certain deformation between the deck and the bulkhead during the use of the ship, which will cause the size to change from the design size. And in the process of welding and assembling the groove type coaming, due to the thermal expansion and contraction of the welding position, the processing technology and the measurement size error, it is impossible to match the groove type coaming and the reserved space in the cabin. The existing solution is to set a margin on the edge of the groove type coaming, and then cut it when hoisted in the cabin. Finally, the cut groove type coaming is installed in the cabin.

[0003] In the above technical solution, because the size of the coaming is increased, the groove type coaming will collide with the bulkhead of the ship during transportation to the cabin, resulting in damage to the groove type coaming or the bulkhead. The groove type coaming has a small wall thickness and a large area. In order to avoid deformation of the groove type coaming during transportation, temporary reinforcement is generally provided on the groove type coaming during transportation, and then removed after installation is completed. Not only is the process complicated, but also the surface of the plate may be damaged during the removal process.

[0004] In the above technical solution, because the size of the coaming is increased, the groove type coaming will collide with the bulkhead of the ship during transportation to the cabin, resulting in damage to the groove type coaming or the bulkhead. The groove type coaming has a small wall thickness and a large area. In order to avoid deformation of the groove type coaming during transportation, temporary reinforcement is generally provided on the groove type coaming during transportation, and then removed after installation is completed. Not only is the process complicated, but also the surface of the plate may be damaged during the removal process. SUMMARY

[0005] ​Therefore, the present application provides a ship hull refitting groove type coaming assembly method to solve the problem of collision with the bulkhead and complicated operation caused by assembling the groove type coaming outside the cabin first and then hoisting the assembled groove type coaming into the cabin.

[0006] A ship hull refitting groove type coaming assembly method, which first transports each component of the groove type coaming to the installation position, then welds a side coaming and the horizontal transition plate corresponding to the coaming on the deck, welds a plurality of groove plates on the horizontal transition plate, and cuts the horizontal excess of the last groove plate when welding; finally, welds the other side coaming and the horizontal transition plate corresponding to the coaming on the deck and the groove plates, and cuts the vertical excess of the coaming before welding.

[0007] Further, the first installed coaming is the upper coaming, and the last installed coaming is the lower coaming, and the excess in the vertical direction of the lower coaming is set.

[0008] Further, before cutting the lower coaming, measure the gap between the groove plate and the deck and mark the part to be cut on the lower coaming.

[0009] Further, the horizontal edges of the coaming and the vertical edges of the groove plate are welded in order from the middle to the ends.

[0010] Further, spot welding is used when welding, and after completing a spot welding, the spot is hammered with a tool to reduce the shrinkage at the spot.

[0011] Further, the spot is hammered until the temperature of the spot is below the preset temperature.

[0012] Further, a wooden hammer or a rubber hammer is used when hammering.

[0013] Further, when cutting the horizontal excess of the groove plate, the groove plate is divided into at least three sections in the vertical direction, and the cutting is performed in order according to the sections, and after cutting one section and before cutting another section, the welding of the cut section is performed first.

[0014] Further, when installing the coaming, measure the size of the coaming in the horizontal direction and the size of the reserved space, and if the size of the coaming is greater than the size of the reserved space, cut the excess of the coaming in the horizontal direction.

[0015] The ship body refitting groove type coaming assembly method has the beneficial effects that: in the ship body refitting groove type coaming assembly method, each component of the groove type coaming is transported to the installation position for installation, which changes the previous mode of transporting the groove type coaming to the cabin interior after external assembly is completed; the excess in the horizontal direction is arranged on one of the groove type plates, and the excess in the up-down direction is arranged on one of the coamings, so that the coaming without the excess is installed first, facilitating installation; the excess is arranged on the last groove type plate, facilitating accurate cutting of the excess; in addition, the coaming with the excess is installed last, facilitating accurate measurement of the excess in the up-down direction and improving installation accuracy; since installation is performed in the cabin and the components are installed separately, transportation is facilitated, collision with the cabin side wall can be avoided during transportation, and one-time installation is also facilitated, so that the strength during transportation and transfer does not need to be considered, the bracket does not need to be additionally welded and removed, the operation steps are simplified, and the problems of easy collision with the cabin wall and complicated operation caused by the prior art of assembling the groove type coaming into a shape outside the cabin and then hoisting the assembled groove type coaming into the cabin are solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0017] Figure 1 is a structural schematic diagram of a groove type plate in the prior art groove type coaming;

[0018] Figure 2 is a structural schematic diagram of the prior art groove type coaming;

[0019] Figure 3 is a structural schematic diagram of the assembly sequence and welding direction in the ship body refitting groove type coaming assembly method of the present application (the arrow is used to represent the welding direction for convenience of display).

[0020] The meanings of the reference numerals in the figure are as follows: 1, upper coaming; 2, upper end horizontal transition plate; 3, groove type plate; 4, lower end horizontal transition plate; 5, lower coaming. DETAILED DESCRIPTION

[0021] In order to make the objects, technical solutions and advantages of the present application more clear, the following will describe the present application through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of the known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0022] The terminology used in the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0023] It is to be understood that the terms first, second, third, etc. can be adopted herein only to describe various information and should not be construed to indicate or imply relative importance. These terms are only used to distinguish one type of information from another. For example, without departing from the scope of the disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "when" or "upon determination" or "in response to determining".

[0024] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0025] In the description of the present application, unless otherwise specified and limited, it should be noted that the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be mechanical connection or electrical connection, it can be the communication between two elements, it can be direct connection or indirect connection through intermediate medium, and the specific meaning of the above terms can be understood by those skilled in the art according to the specific circumstances.

[0026] In the subsequent description, the suffix such as "module", "component" or "unit" used to represent elements is only for the convenience of description of the present application, and has no specific meaning in itself. Therefore, "module" and "component" can be used interchangeably.

[0027] In order to better understand the technical solutions of the present application, the present application will be described in detail below with reference to the accompanying drawings.

[0028] In the embodiment of the ship body modification groove type coaming assembly method in the present application:

[0029] The groove type surrounding wall in the present application is composed of multiple components, and specifically can refer to Figure 2 , including an upper surrounding wall 1, an upper end horizontal transition plate 2 arranged perpendicularly to the upper surrounding wall 1, a lower surrounding wall 5, a lower end horizontal transition plate 4 arranged perpendicularly to the lower surrounding wall 5, and a groove type plate 3 located between the two horizontal transition plates. Generally, the groove type plate 3 is a prefabricated plate material with a specific specification purchased externally, and its size is relatively fixed and its weight is relatively heavy. Therefore, in the present embodiment, there are two groove type plates 3 arranged left and right. Of course, in other embodiments, the number of groove type plates is arranged according to the actual size. If the size of the groove type surrounding wall is larger, three or four groove type plates can be arranged. If the size of the groove type surrounding wall is smaller, one groove type plate can be arranged. At this time, since there is only one groove type plate, the remaining amount is arranged on the groove type plate.

[0030] In order to avoid collision with the bulkhead during overall hoisting, in the present embodiment, multiple components constituting the groove type surrounding wall are transported to the position where assembly is to be performed, and assembly is directly performed at the position where assembly is to be performed. In the assembly process, welding assembly is sequentially performed in the order of the upper surrounding wall 1, the upper end horizontal transition plate 2, the two groove type plates 3, the lower horizontal transition plate, and the lower surrounding wall 5. The following describes each step in detail.

[0031] As shown in Figure 2 and Figure 3 , during assembly, the upper surrounding wall 1 is first installed. The upper surrounding wall 1 is a vertically arranged steel plate, and after installation is completed, it is in contact with the bottom of the upper deck and the bulkheads on both sides. During welding, the upper part of the upper surrounding wall 1 is first welded at the lower surface of the upper deck, and then the left and right sides of the upper surrounding wall 1 are welded on the bulkheads on both sides, that is, welding is sequentially performed in the order of 1A, 1B, and 1C in Figure 3 . Since the place where the bulkhead is in contact with the upper surrounding wall 1 is located at the corner, the possibility of deformation is small, so the size is cut according to the good advance amount. At this time, the left and right sizes of the upper surrounding wall 1 can generally be ensured to be adapted. If it is found during welding that the left and right length sizes of the upper surrounding wall 1 do not match the sizes of the bulkheads on both sides, the left and right sides of the upper surrounding wall 1 can also be welded before welding.

[0032] Next, the upper horizontal transition plate 2 needs to be installed at the bottom of the upper bulkhead 1. The upper horizontal transition plate 2 is a horizontally placed steel plate, and the lower edge of the upper bulkhead 1 is welded to the middle position of the upper horizontal transition plate 2, as shown in position 2A in the figure. During welding, the upper surface of the upper horizontal transition plate 2 is fixedly connected to the lower edge of the upper bulkhead 1, and the left and right sides of the upper horizontal transition plate 2 are fixedly connected to the bulkheads on both sides. Similarly, the upper horizontal transition plate 2 can also be cut according to the actual size, which generally ensures that the left and right dimensions of the upper horizontal transition plate 2 are compatible. If the left and right dimensions of the upper horizontal transition plate 2 are found to be too large during the welding process, it can also be cut before welding. After the upper bulkhead 1 and the upper horizontal transition plate 2 are connected, they will form a T-shaped structure. The upper bulkhead 1 and the upper horizontal transition plate 2 can be installed separately for easy cutting when the size is not suitable. Of course, in other embodiments, the upper enclosure 1 and the upper horizontal transition plate 2 can be welded together first, and then the upper enclosure 1 and the upper horizontal transition plate 2 can be assembled as a whole in the cabin.

[0033] After completing the installation of the upper bulkhead 1 and the upper horizontal transition plate 2, the channel plate 3 needs to be installed. Since there are two channel plates 3, one is installed first. During installation, because the bulkhead may deform, a margin needs to be set on the channel plate 3. In this embodiment, the sum of the left and right dimensions of the two channel plates 3 is greater than the actual dimension between the two bulkheads. During installation, one channel plate 3 is installed first, and when installing the second channel plate 3, the excess part is cut off before installation. In actual settings, the two channel plates 3 can be set to the same size, and the second channel plate 3 can be cut off when it is installed, or the margin can be directly reserved on the second channel plate 3. After cutting, the dimensions of the two channel plates 3 are similar. Cutting off the margin when installing the second channel plate 3 can minimize measurement and assembly errors.

[0034] Specifically, when installing the first channel plate 3, the vertical edge of the channel plate 3 is first welded and fixed to the bulkhead. Then, the upper edge of the first channel plate 3 is welded to the upper horizontal transition plate 2, thus achieving the installation and fixation of the first channel plate 3. Next, the second channel plate 3 needs to be installed. During installation, the vertical edge of the second channel plate 3 closest to the first channel plate 3 is first welded to the first channel plate 3. Then, the upper edge of the second channel plate 3 is welded to the upper horizontal transition plate 2. Finally, the other vertical edge of the second channel plate 3 needs to be welded to the bulkhead, i.e., according to... Figure 3The welding is performed in the order of 3A, 3B, 3C, 3D and 3E. Since the second groove plate 3 has a surplus, it needs to be cut. When cutting, the cutting and welding are performed simultaneously. The vertical edge of the second groove plate 3 to be cut is divided into sections, for example, every 100 mm is a section, and one section is cut and welded at a time. After the welding of the section is completed, another section is cut. During the cutting, the groove plate 3 generates heat, and the heat causes the thermal expansion and contraction of the groove plate 3, and the edge position is deformed. The cutting and welding at a time can minimize the deformation caused by the heat during the cutting, and can improve the flatness of the welded position and reduce the dimensional deviation caused by the deformation. Of course, in other embodiments, the edges with the surplus can be cut entirely, and the deformed area can be trimmed before the welding to minimize the error. Alternatively, in other embodiments, the edge of the second groove plate 3 close to the bulkhead can be welded to the bulkhead first, and the surplus can be arranged at the joint of the two groove plates 3, and the overlapping part of the two groove plates 3 can be cut before the welding to keep the two groove plates 3 in the butt joint state.

[0035] Then, the welding of the lower end horizontal transition plate 4 is performed. When welding, the upper surface of the lower end horizontal transition plate 4 is welded to the lower surface of the groove plate 3. Then, the edges of the left and right ends of the lower end horizontal transition plate 4 are welded to the bulkheads on the left and right sides. The installation of the lower end horizontal transition plate 4 is completed at the position shown in the figure. Like the upper end horizontal transition plate 2, if it is found during the welding that the left and right dimensions of the lower end horizontal transition plate 4 are larger, the cutting can be performed before the welding.

[0036] Finally, the installation of the lower coaming 5 is performed. When manufactured, the lower coaming 5 has a surplus in the vertical direction. When welding, first, the upper edge of the lower coaming 5 is welded to the lower end horizontal transition plate 4, and then the left and right edges of the lower coaming 5 are welded to the bulkheads on the left and right sides. Of course, like the upper coaming 1, if the left and right length dimensions of the lower coaming 5 are larger than the actual dimensions of the bulkheads on the left and right sides during the welding, the excess part needs to be cut first. Finally, the welding of the lower edge of the lower coaming 5 to the deck is performed, that is, the welding is performed in the order of 5A, 5B, 5C and 5D. Figure 3 The welding is performed in the order of 5A, 5B, 5C and 5D. Since the lower coaming 5 has a surplus, it needs to be cut. Specifically, before cutting, the part to be cut is marked according to the actual dimensions, and for the marked area, the cutting and welding are performed simultaneously. The cutting is performed in the left and right length directions of the lower coaming 5, for example, every 100 mm is a section, and one section is cut and welded at a time. After the welding of the section is completed, another section is cut, and the cutting of the entire lower surface of the lower coaming 5 is completed. Of course, in other embodiments, the lower end horizontal transition plate and the lower coaming can be welded as a whole first, and then welded and fixed.

[0037] The essence of welding is to use a welding rod or a flame to heat and form a molten pool, and then the different parts can be combined after the molten pool cools down. During the cooling of the molten pool, shrinkage occurs, resulting in shrinkage pre-stress of the material around the molten pool. Since the groove plate 3, the enclosure and the horizontal transition plate are all thin plates, when they have shrinkage pre-stress, they will shrink and deform, eventually making the actual edge area smaller than the original edge size. In order to reduce the impact of this deformation on the assembly accuracy, spot welding is used during welding to reduce the number of molten pools and reduce this impact. In addition, after completing a spot welding, a wooden hammer or a rubber hammer is used to hammer the spot to reduce the shrinkage at the spot. When hammering, attention should be paid to hammering the spot to reduce the temperature below the preset temperature. The spot temperature drops quickly, usually determined by the number of strikes. Generally, the strikes have approximately the same interval, and the number of strikes is used to determine whether it has dropped below the set temperature. Or it can also be determined by visual observation of the color and shape of the spot to determine whether it has dropped below the preset temperature, or it can also be determined by time. Or, in other embodiments, instead of using a wooden hammer or a rubber hammer, a steel hammer can be used to tap, and attention should be paid to controlling the force when tapping to avoid deforming the plate.

[0038] In addition, in order to further reduce the deformation of the plate during welding, for a longer edge, the welding is performed from the middle to both ends. Since the middle has been fixed and is in the right position, even if the two ends shrink during welding, the shrinkage will be reduced, that is, the total shrinkage is borne by both sides, so that the deformation of each end is reduced. Of course, in other embodiments, the two ends can be welded and fixed before welding to determine the position and then weld the middle part.

[0039] It should be clear that the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

Claims

1. A method for assembling a trough-shaped bulkhead for hull modification, characterized in that: First, transport all components of the trough-shaped bulkhead to the installation location. Then, weld the bulkhead and its corresponding horizontal transition plate on one side to the deck. Next, weld multiple trough-shaped plates onto the horizontal transition plate and remove the horizontal excess when welding the last trough-shaped plate. Finally, weld the bulkhead and its corresponding horizontal transition plate on the other side to another deck and the trough-shaped plate, and remove the vertical excess of the bulkhead on the other side before welding.

2. The method for assembling a hull-modification channel-shaped bulkhead according to claim 1, characterized in that: Install the enclosure on one side first as the upper enclosure, and install the enclosure last as the lower enclosure, with a margin set in the vertical direction of the lower enclosure.

3. The method for assembling a hull-modification channel-shaped bulkhead according to claim 2, characterized in that: Before cutting the lower hull, measure the gap between the trough plate and the other deck and mark the part that needs to be cut on the lower hull.

4. The method for assembling a hull-modification channel-shaped bulkhead according to any one of claims 1-3, characterized in that: The horizontal edges of the enclosure and the vertical edges of the channel plate are welded in the order from the middle to both ends.

5. The method for assembling a hull-modification channel-shaped bulkhead according to any one of claims 1-3, characterized in that: Spot welding is used during welding, and after completing one spot weld, the weld point is hammered with a tool to reduce shrinkage at the weld point.

6. The method for assembling a hull-modification channel-shaped bulkhead according to claim 5, characterized in that: Hammer the solder joint until the solder joint temperature drops below the preset temperature.

7. The method for assembling a hull-modification channel-shaped bulkhead according to claim 5, characterized in that: Use a wooden mallet or rubber mallet when hammering.

8. The method for assembling a hull-modification channel-shaped bulkhead according to any one of claims 1-3, characterized in that: When removing the horizontal allowance of the channel plate, the channel plate is divided into at least three sections along the vertical direction. The sections are removed in sequence. After removing one section and before cutting another section, the removed section is welded first.

9. The method for assembling a hull-modification channel-shaped bulkhead according to any one of claims 1-3, characterized in that: During the installation of the enclosure, measure the horizontal dimensions of the enclosure and the dimensions of the reserved space. If the dimensions of the enclosure are larger than the dimensions of the reserved space, then cut off the excess in the horizontal direction of the enclosure.

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