A structural lifting ring installed in a narrow area and a construction method for a narrow area

Abstract

The present invention relates to a structural lifting ring installed in a narrow area of a hull. The narrow area is a hull section that is constructed in an inverted state and assembled in a normal state. The hull section is a bow section. The bow section is provided with a B-type lifting ring, a special C-type lifting ring, and a D-type lifting ring. The special C-type lifting ring is a structural lifting ring. The structural lifting ring is a lifting ring shape reserved on the plate forming the narrow area. The reserved lifting ring is integrated with the structural plate frame during the structural nesting. The bow section is constructed in an inverted state. The B-type lifting ring, the special C-type lifting ring, the D-type lifting ring, and the hook are combined to complete the turning over of the bow section. The structural lifting ring is cut off after the turning over of the hull section is completed. The present invention also relates to a construction method for a narrow area. The structural lifting ring and construction method of the present invention not only avoid the subsequent installation work of the lifting ring by designing the structural lifting ring, but also reduce the workload of welding, improve the efficiency of installation and removal, and make it more convenient to cut off the lifting ring after use.

Description

Technical Field

[0001] The present invention relates to shipbuilding, and in particular to a structural lifting ring installed in a narrow area and a construction method of the narrow area. Background Art

[0002] In shipbuilding, the process typically begins with building blocks according to blueprints, assembling them into master blocks, then loading them onto the hull structure. Finally, outfitting of various outfitting components is performed. Both block and master block construction typically requires a reverse construction method. The hooks and lifting rings of a crane are then used to turn the block over and hoist it, completing the master block. During this process, the design of the lifting rings is crucial.

[0003] In the prior art, lifting rings are often welded onto the segments later. The number and installation position of the lifting rings are determined based on the shape and center of gravity of the completed segments. The lifting rings are then welded to the appropriate position for turning over or lifting operations. However, for some segments, the positioning of the lifting rings added later is problematic, and the turning over operation is difficult to complete effectively. For example, during the shipbuilding process, the bow segments are generally built in reverse order and then assembled in normal order. Figure 1 As shown, most bow sections are wide at the top and narrow at the bottom. The section turning hook is installed in this narrow lower area. Due to the narrow lower opening of the section, installation and removal of the lifting ring are inconvenient. This requires a change in the original working method to effectively construct and lift in narrow areas such as the bow section. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the prior art by providing a structural hoist ring for installation in a confined area and a method for constructing such a confined area. By redesigning the hoist ring, the present invention not only eliminates the need for subsequent installation work, but also reduces welding workload, improves installation and removal efficiency, and makes it easier to cut the hoist ring.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution provided by the present invention is as follows:

[0006] A structural lifting ring installed in a narrow area of a hull, wherein the narrow area is a hull section that is constructed in an inverse manner and assembled in a normal manner, wherein the hull section is a bow section, and a B-type lifting ring, a special C-type lifting ring and a D-type lifting ring are provided on the bow section. The special C-type lifting ring is a structural lifting ring, and the structural lifting ring is a lifting ring shape reserved on the plate constituting the narrow area. The reserved lifting ring is integrated with the structural plate frame during the structural nesting. The narrow area is constructed in an inverse manner, and the B-type lifting ring, the special C-type lifting ring and the D-type lifting ring are combined with a hook to complete the turning over of the narrow area. The structural lifting ring is cut off after the turning over of the hull section is completed.

[0007] In the structural lifting ring installed in the narrow area of the hull of the present invention, the hull section is a bow section, the deck surface of the bow section is wide, and the width of the narrow lower mouth is less than 1 meter. Its structure includes ribs, center fir beams, platform plate components and outer plates.

[0008] In the structural lifting ring installed in the narrow area of the hull of the present invention, the B-type lifting ring is welded to the deck surface, and a B-type lifting ring is provided on each side of the structural center of gravity of the bow section. The B-type lifting ring is welded at the hard stop position of the structure to avoid deformation.

[0009] In the structural lifting ring installed in the narrow area of the hull of the present invention, the D-shaped lifting ring is welded to the end position of the bow section as the main hook for turning over, and the D-shaped lifting ring is welded to the end position of the deck surface. The D-shaped lifting ring and the special C-shaped lifting ring are distributed on both sides of the bow section symmetrically with the center of gravity of the structure.

[0010] In the structural lifting ring installed in a narrow area of the hull of the present invention, the structural lifting ring includes a lifting ring main plate and a lifting ring web. The lifting ring main plate has the same plate thickness as the connected structural plate. The lifting ring main plate and the structural plate frame are integrated into one, and the lifting ring web is welded to the lifting ring main plate.

[0011] In the structural lifting ring installed in a narrow area of the hull of the present invention, the hole diameter of the lifting ring web is the same as the hole diameter of the lifting ring main plate, and the centers of the holes are aligned.

[0012] A method for constructing a narrow area, wherein the narrow area is a bow section, the bow section being a funnel-shaped section that is wide at the top and narrow at the bottom, the bow section having a wide deck surface and a narrow lower portion that is less than 1 meter wide, and the structure comprising ribs, a center fir girder, a platform plate assembly, and an outer plate. The method is characterized in that the method comprises the following steps:

[0013] The first step is to build the bow section. Using the ribs as the base, install the center fir girder and platform plate assembly to form the rib middle group. The platform plate assembly includes the platform plate and accessories. The rib middle group is turned 90 degrees, and then the accessories are installed using the platform plate as the base. The outer plate is installed to form a complete bow section. At this time, the bow section is in an inverted state.

[0014] The second step is to set the lifting rings. Two D-type lifting rings are provided on the platform plate as the main hooks for turning over. Two B-type lifting rings are provided on the other side of the center of gravity as the first auxiliary hooks for turning over. A structural lifting ring is reserved at the lower mouth of the bow segment as a special C-type lifting ring. The C-type lifting ring serves as the second auxiliary hook for turning over. The special C-type lifting ring is a structural lifting ring. The structural lifting ring is an integrated lifting ring with the adjacent structure in advance. The structural lifting ring includes a lifting ring main plate and a lifting ring web. The lifting ring main plate has the same plate thickness as the connected structural plate. The lifting ring main plate is integrated with the structural plate frame. The lifting ring web is welded to the lifting ring main plate. The hole size of the lifting ring web is the same as that of the lifting ring main plate, and the center of the hole is aligned.

[0015] The third step is to turn over the bow section by section. Connect one of the gantry crane's lifting rods to the D-shaped lifting ring and the other to the special C-shaped lifting ring. Slowly pull up the bow section. Then, keep the lifting rod connected to the special C-shaped lifting ring still and continue to pull up the lifting rod connected to the D-shaped lifting ring until the bow section is upright. Release the lifting rod connected to the special C-shaped lifting ring and connect the released lifting rod to the B-shaped lifting ring. Pull up the lifting rod to complete the bow section turning over.

[0016] The fourth step is cutting the lifting rings. After the bow is turned over in sections, the B-type lifting rings, special C-type lifting rings and D-type lifting rings are cut off separately. After cutting, the cut parts are polished and smoothed, and then repainted.

[0017] In a construction method for a narrow area of the present invention, on the bow section, the center fir girder is vertically fixed to a rib serving as a base surface, and a plurality of platform plate assemblies are vertically connected between the center fir girder and the ribs. The ribs, center fir girder, and platform plate assemblies form a rib middle group, and an outer plate is provided outside the rib middle group.

[0018] In a construction method for a narrow area of the present invention, further, the B-type lifting ring is fixed on the deck surface, and a B-type lifting ring is provided on both sides of the structural center of gravity of the bow section, and the B-type lifting ring is welded at the hard stop position of the structure to avoid deformation; the D-type lifting ring is welded at the end position of the bow section as the main hook for turning over, and the D-type lifting ring is welded at the end position of the deck surface, and the D-type lifting ring and the special C-type lifting ring are symmetrically distributed on both sides of the bow section with respect to the structural center of gravity.

[0019] Based on the above technical solution, the structural lifting ring in a narrow area and the construction method in a narrow area of the present invention have achieved the following technical advantages through practical application:

[0020] 1. The structural lifting ring of the present invention is pre-inserted with the structure as an integrated material, and the excess part is cut off after the segmented turning is completed. This not only avoids the installation of the lifting ring in a small area, but also reduces the welding workload and improves the efficiency of installation and removal.

[0021] 2. The bow section of the present invention, a typical narrow area, is constructed in reverse from the outset, making it easy to operate. During reverse construction, a set of main hooks for turning over are installed on the deck, and a set of auxiliary hooks for turning over are installed at the lower end. The main hooks and auxiliary hooks need to be installed on both sides of the center of gravity. Because the center of gravity is close to the bow, the auxiliary hooks need to be installed close to the stem. During turning over, a set of wire ropes is connected to the main hooks, and another set of wire ropes is connected to the structural lifting rings. After the section is hoisted, the auxiliary hooks are slowly lowered. Then, by changing the hooks, the wire ropes are connected to the auxiliary hooks on the deck to complete the turning of the bow section. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a schematic diagram of the installation position of the upper lifting ring of the bow section in the prior art.

[0023] Figure 2 Schematic diagram of the structural composition of the bow section in an embodiment of the present invention.

[0024] Figure 3 It is a schematic structural diagram of a structural lifting ring installed in a narrow area of a hull according to the present invention.

[0025] Figure 4 It is a schematic diagram of the reverse state of the structural lifting ring on the bow section of the present invention.

[0026] Figure 5 It is a schematic diagram of the structural lifting ring on the bow section of the present invention in a normal state after being turned over. DETAILED DESCRIPTION

[0027] Below we will further elaborate on the structural lifting ring for a narrow area and the construction method for a narrow area of the present invention in combination with the accompanying drawings and specific embodiments, in order to more clearly understand its structural composition and working mode, but this cannot be used to limit the scope of protection of the patent of the present invention.

[0028] like Figure 2 As shown, this narrow area is a special section in hull construction, such as the bow section, which is constructed through reverse construction and normal assembly. The hull section in question is the bow section, which has a wide deck and a narrow lower opening less than 1 meter wide. Its structure includes ribs, center beams, platform plate assemblies, and shell plating.

[0029] like Figure 3As shown, the present invention first designs a structural lifting ring installed in a narrow area of the hull, which is a hull section that is constructed in an inverse manner and assembled in a normal manner. The hull section is a bow section, and a B-type lifting ring 7, a special C-type lifting ring 5 and a D-type lifting ring 6 are provided on the bow section. The special C-type lifting ring 5 is a structural lifting ring, which is a lifting ring shape reserved on the plate constituting the narrow area. The reserved lifting ring is integrated with the structural plate frame during the structural nesting. The narrow area is constructed in an inverse manner, and the B-type lifting ring 7, the special C-type lifting ring 5 and the D-type lifting ring 6 are combined with a hook to complete the turning over of the narrow area. The structural lifting ring is cut off after the turning over of the hull section is completed.

[0030] The B-type lifting ring 7 is fixed on the deck surface. A B-type lifting ring 7 is provided on each side of the structural center of gravity of the bow section. The B-type lifting ring 7 is welded at the hard stop position of the structure to avoid deformation; the D-type lifting ring 6 is welded at the end position of the bow section as the main hook for turning over. The D-type lifting ring 6 is welded at the end position of the deck surface. The D-type lifting ring 6 and the special C-type lifting ring 5 are symmetrically distributed on both sides of the bow section with respect to the structural center of gravity.

[0031] In its specific structural design, the custom C-shaped lifting ring 5 is designed as a structural lifting ring, comprising a main ring body and a web. The main ring body has the same thickness as the structural plate to which it is attached, and the main ring body and the structural plate frame are integrated into a single piece. The web is welded to the main ring body. The hole diameter of the web is the same as that of the main ring body, and the center of the hole is aligned.

[0032] The present invention also relates to a method for constructing a narrow area, which is a bow section. Figure 1 and Figure 2 As shown, the bow section is a funnel-shaped section that is wide at the top and narrow at the bottom. The deck of the bow section is wide, and the width of the narrow part at the bottom is less than 1 meter. Its structure includes ribs, a center girder 2, a platform plate assembly, and an outer plate 4. The construction and hoisting method includes the following steps:

[0033] The first step is to build the bow section. Using the rib plate as the base surface, install the center fir girder 2 and the platform plate assembly 3 to form the rib plate middle group 1. The platform plate assembly includes the platform plate 3 and auxiliary components. The rib plate middle group 1 is turned over 90 degrees, and then the auxiliary components are installed using the platform plate 3 as the base surface. The outer plate 4 is installed to form a complete bow section. At this time, the bow section is in an inverted state.

[0034] The second step is to set up the lifting rings. Two D-type lifting rings 6 are provided on the platform plate as the main hooks for turning over, two B-type lifting rings 7 are provided on the other side of the center of gravity as the first auxiliary hooks for turning over, and two special C-type lifting rings 5 are provided at the lower mouth of the bow section as the second auxiliary hooks for turning over. The special C-type lifting ring 5 is a structural lifting ring. The structural lifting ring is integrated with the adjacent structure in advance. The structural lifting ring includes a lifting ring main plate and a lifting ring web. The lifting ring main plate has the same plate thickness as the connected structural plate. The lifting ring main plate and the structural plate frame are integrated into one. The lifting ring web is welded to the lifting ring main plate. The aperture size of the lifting ring web is the same as the aperture size of the lifting ring main plate, and the center of the hole is aligned.

[0035] The third step is to turn over the bow section. Connect one of the gantry crane's lifting rods to the D-type lifting ring 6 and the other lifting rod to the special C-type lifting ring 5. Slowly pull up the bow section. Then keep the lifting rod connected to the special C-type lifting ring 5 still and continue to pull up the lifting rod connected to the D-type lifting ring 6 until the bow section is erected. Release the lifting rod connected to the special C-type lifting ring 5 and connect the released lifting rod to the B-type lifting ring 7. Pull up the lifting rod to complete the turning over of the bow section.

[0036] The fourth step is ring cutting. After the bow is turned over in sections, the B-type ring 7, the special C-type ring 5 and the D-type ring 6 are cut off respectively. After cutting, the cut parts are polished and smoothed, and repainted.

[0037] In a construction method for a narrow area of the present invention, on the bow section, the center girder is vertically fixed to the rib plate serving as the base surface, and multiple platform plate assemblies are vertically connected between the center girder and the rib plate. The rib plate, center girder 2 and platform plate assembly form a rib plate middle group 1, and an outer plate 4 is provided on the outside of the rib plate middle group 1.

[0038] In the present invention's method for constructing a narrow area, the B-type lifting ring 7 is welded to the deck surface. A B-type lifting ring 7 is provided on either side of the bow section's structural center of gravity, secured in a rigid position to prevent deformation. The D-type lifting ring 6, serving as the main hook for turning over, is secured to the end of the bow section. The D-type lifting ring 6 is welded to the end of the deck surface and is symmetrically distributed on either side of the bow section with the custom-made C-type lifting ring 5 about the structural center of gravity.

[0039] Example 1

[0040] This example uses the bow section FG22C as an example to illustrate the application of the present invention's structural lifting ring in narrow areas, as well as its construction and turnaround methods. Specifically, this bow section is a funnel-like structure, wide at the top and narrow at the bottom. It has a wide deck and a very narrow lower opening, only 1 meter at its widest point. The section's center of gravity is located only one rib from the widest point in the ship's length, approximately 700 mm.

[0041] The bow sections are only 718mm apart at their center of gravity, and 322mm apart from the center of gravity to the bow rib. Separated by the center girder, this leaves only 161mm of operating space on each side. Furthermore, because the sections are constructed in an inverted configuration, each section stands approximately 5.2 meters tall, requiring scaffolding to install the auxiliary hooks.

[0042] The construction process of the bow section is as follows: with the rib plate as the base surface, the middle longitudinal girder and platform plate components are installed to form the rib plate middle group, see Figure 2 ; Use the platform plate as the base surface to install various components. At this time, the rib plate middle group needs to be turned over 90 degrees to see Figure 3 Finally, install the outer panels to form a complete segment. At this point, the entire segment is in an inverted state and needs to be turned 180 degrees to return to a normal state. Figure 5 As shown, two D-shaped lifting rings are installed on the platform plate as the main hooks for turning over, and two B-shaped lifting rings are installed on the other side of the center of gravity as auxiliary hooks for turning over. At the lower end of the segment, a reserved structural lifting ring serves as an auxiliary hook for turning over. Connect one lifting chain of the gantry crane to the D-shaped lifting ring and the other lifting chain to the special C-shaped lifting ring. Slowly pull up the segment. Then, keep the lifting chain connected to the special C-shaped lifting ring stationary and continue to pull the lifting chain connected to the D-shaped lifting ring upward until the segment stands upright. At this time, release the lifting chain connected to the special C-shaped lifting ring, connect it to the B-shaped lifting ring, and pull up the lifting chain to complete the turning over of the segment.

[0043] After the bow section is turned over, the lifting ring is cut off. Since the section is welded to the structure, the weld needs to be polished smooth after cutting. Polishing will damage the paint on the section, so it needs to be repainted.

[0044] While conventional lifting rings require blanking, cutting, assembly, and then welding to the structure, the structural lifting rings in this embodiment can be CNC-cut in advance, eliminating the need for assembly and welding. This eliminates the need for overhead work and avoids the safety issues associated with such work. Finally, the segments are turned back to their normal position during cutting, allowing construction workers to remove the lifting rings on flat ground. Furthermore, because the structural lifting rings are extensions of the center longitudinal girder, they cause less damage to the structure during removal, requiring less area for polishing and repainting, reducing material loss and workload for construction workers.

[0045] Undoubtedly, the above is only one limited implementation of a structural hoist ring installed in a confined area and a method for constructing such a confined area. Other feasible structural designs and operational processes are also possible. In short, the scope of protection of the present invention also includes other variations and substitutions that would be obvious to those skilled in the art.

Claims

1. A structural lifting ring installed in a narrow area of a ship hull, wherein the narrow area is a hull section constructed in an inverse manner and assembled in a normal manner, characterized in that: The hull section is a bow section, the deck surface of the bow section is wide, and the width of the narrow lower part is less than 1 meter. Its structure includes ribs, center fir beams, platform plate components and outer plates. A B-type lifting ring, a special C-type lifting ring and a D-type lifting ring are provided on the bow section. The special C-type lifting ring is a structural lifting ring provided at the lower end of the bow section. The structural lifting ring is a ring shape reserved on the plate composed of a narrow area. The reserved lifting ring is aligned with the structural plate when the structure is nested. The frame is integrated and manufactured, the narrow area is reversely constructed, and the turning over of the narrow area is completed by using a combination of B-type lifting rings, special C-type lifting rings and D-type lifting rings and hooks. The structural lifting rings are cut off after the hull segment turning over is completed; the structural lifting rings include a lifting ring main plate and a lifting ring web. The lifting ring main plate has the same plate thickness as the connected structural plate frame. The lifting ring main plate and the structural plate frame are integrated and manufactured, and the lifting ring web is welded to the lifting ring main plate.

2. A structural lifting ring installed in a narrow area of a ship hull according to claim 1, characterized in that: The B-type lifting ring is welded on the deck surface. A B-type lifting ring is provided on both sides of the structural gravity center of the bow segment. The B-type lifting ring is welded at the hard stop position of the structure to avoid deformation.

3. A structural lifting ring installed in a narrow area of a ship hull according to claim 1, characterized in that: The D-shaped lifting ring is welded at the end of the bow section as the main hook for turning over. The D-shaped lifting ring is welded at the end of the deck surface. The D-shaped lifting ring and the special C-shaped lifting ring are symmetrically distributed on both sides of the bow section about the center of gravity of the structure.

4. A structural lifting ring installed in a narrow area of a ship hull according to claim 1, characterized in that: The aperture of the lifting ring web is the same as that of the lifting ring main plate, and the centers of the holes are aligned.

5. A method for constructing a narrow area, wherein the narrow area is a bow section, the bow section being a funnel-shaped section that is wide at the top and narrow at the bottom, the deck of the bow section being wide and the width of the narrow part at the bottom being less than 1 meter, the structure comprising ribs, a center girder, a platform plate assembly, and an outer plate, characterized in that: The construction and hoisting method includes the following steps: The first step is to build the bow section. Using the ribs as the base, install the center fir girder and platform plate assembly to form the rib middle group. The platform plate assembly includes the platform plate and accessories. The rib middle group is turned 90 degrees, and then the accessories are installed using the platform plate as the base. The outer plate is installed to form a complete bow section. At this time, the bow section is in an inverted state. The second step is to set the lifting rings. Two D-type lifting rings are provided on the platform plate as the main hooks for turning over, and two B-type lifting rings are provided on the other side of the center of gravity as the first auxiliary hooks for turning over. The structural lifting ring reserved at the lower mouth of the bow segment is used as a special C-type lifting ring. The special C-type lifting ring serves as the second auxiliary hook for turning over. The special C-type lifting ring is a structural lifting ring. The structural lifting ring is integrated with the adjacent structure in advance. The structural lifting ring includes a lifting ring main plate and a lifting ring web. The lifting ring main plate has the same plate thickness as the connected structural plate frame. The lifting ring main plate and the structural plate frame are integrated into one. The lifting ring web is welded to the lifting ring main plate. The hole size of the lifting ring web is the same as the hole size of the lifting ring main plate, and the center of the hole is aligned. The third step is to turn over the bow section by section. Connect one of the gantry crane's lifting rods to the D-shaped lifting ring and the other to the special C-shaped lifting ring. Slowly pull up the bow section. Then, keep the lifting rod connected to the special C-shaped lifting ring still and continue to pull up the lifting rod connected to the D-shaped lifting ring until the bow section is upright. Release the lifting rod connected to the special C-shaped lifting ring and connect the released lifting rod to the B-shaped lifting ring. Pull up the lifting rod to complete the bow section turning over. The fourth step is cutting the lifting rings. After the bow is turned over in sections, the B-type lifting rings, special C-type lifting rings and D-type lifting rings are cut off separately. After cutting, the cut parts are polished and smoothed, and then repainted.

6. A method for constructing a narrow area according to claim 5, characterized in that: On the bow section, the center fir girder is vertically fixed on the rib plate serving as the base surface, and a plurality of platform plate assemblies are vertically connected between the center fir girder and the rib plate. The rib plate, center fir girder and platform plate assembly form a rib plate middle group, and an outer plate is provided outside the rib plate middle group.

7. The method for constructing and hoisting a bow section according to claim 5, characterized in that: The B-type lifting ring is fixed on the deck surface. A B-type lifting ring is provided on both sides of the structural center of gravity of the bow section. The B-type lifting ring is fixed at the hard stop position of the structure to avoid deformation; the D-type lifting ring is fixed at the end position of the bow section as the main hook for turning over. The D-type lifting ring is fixed at the end position of the deck surface. The D-type lifting ring and the special C-type lifting ring are distributed on both sides of the bow section symmetrically with the structural center of gravity.

Images