Lashing arrangement for mixed loading of containers of two lengths in the cargo hold of a container ship

Abstract

The present invention relates to a lashing arrangement structure for mixed loading of containers of two lengths in a cargo hold of a container ship; the end face of the cargo hold wall is arranged to have a plurality of holes corresponding to the size of the end face of the container, and a pair of lashing eye rings for fixing one end of a lashing rod are arranged on the upper side or the lower side of the edge of each hole; when a shorter container is loaded in the cargo hold, the end face of the container adjacent to the cargo hold wall is retracted from the cargo hold wall by a gap, and cannot be fixed by the guide rail on the bulkhead; at this time, one end of the lashing rod needs to be lashed and fixed with the lashing eye ring, and the other end needs to be fixed with the lashing hole of the container in the diagonal direction, so as to fix the shorter container; the cargo hold wall has an extended platform for lashing operators to walk outward at the corresponding height of each layer of containers. The present invention satisfies any mixed loading of two different sizes in the cargo hold without losing the stack weight; the lashing position is flexibly arranged according to the actual loading situation, and the operation is simple and economical.

Description

Technical Field

[0001] The invention relates to a lashing arrangement structure for mixed loading of containers of two lengths in a cargo hold of a container ship, belonging to the technical field of container arrangement in a cargo hold. Background Art

[0002] The container rail rack is a device installed inside the cargo hold of a container ship to fix the container. The rails are like grids that limit the lateral displacement of the container when the ship moves in the waves, playing the role of lateral limit.

[0003] Conventional container ship rails are fixed at the front and rear ends of the cargo hold. The front and rear ends of the container must be stuck in the rails to be effectively fixed. Currently, the most common container lengths in the existing technology are 40 feet and 20 feet. The cargo hold length and rails are generally designed to load one 40-foot container, and can also load two 20-foot containers. Figure 1 , Figure 2 shown.

[0004] Another relatively common type of container in the prior art is 45 feet in length. For conventional ships with a cargo hold designed for 40 feet, 45-foot containers can only be loaded on the open deck above the cargo hold, and the number of containers loaded is limited. 45-foot containers are more common in the European market, and owners of small feeder container ships sailing in Europe often require the cargo hold to be able to load both 40-foot and 45-foot containers. This requires the cargo hold length to meet the requirements for loading 45-foot containers.

[0005] In order to meet the requirements of loading 40-foot and 45-foot containers in the cargo hold, the existing design generally focuses on the guide rail design. Currently, there are generally two types of guide rail frames that can meet the requirements of loading 40-foot and 45-foot containers, one is a movable guide rail frame, and the other is a fixed extra-wide guide rail.

[0006] Movable guide frame: The front and rear guide frames in the cargo hold have a conventional fixed guide frame at one end and a movable guide frame at the other end. Depending on the length of the loaded container (40 feet or 45 feet), the movable guide frame can be moved and switched between two different positions. When loading a longer 45-foot container, the movable guide rail is placed close to the transverse bulkhead. When loading a 40-foot container, the guide rail is moved to a position approximately 1.5m away from the transverse warehouse wall and connected through the support and the transverse bulkhead. The structure of the movable guide rail is similar to that of the conventional guide rail. It is generally composed of two angle steels. It bears the horizontal lateral force F1 of the container, and the lever arm is L1. The bending moment on the guide rail is M1 = F1×L1, see Figure 3When the movable guide frame is moved, the connection between the guide frame and the hull needs to be disassembled first, then lifted to another location by a crane, and finally reconnected and fixed to the hull, which is very troublesome.

[0007] Fixed extra-wide rails: The length difference between 40-foot and 45-foot containers is 1.524 meters. If they are aligned in the middle, the difference between the two ends is 0.762 meters. In addition to the gap between the container and the transverse bulkhead, in order to fix both types of containers in the rail rack, the width of the partition of the fixed extra-wide rail needs to be more than 1 meter. Figure 4 . When loading a 40-foot box, the point of action of the box on the guide rail force F2 is at the top of the guide rail, the lever arm is L2, and the bending moment M2 = F2 × L2. Assume that the two forces F1 and F2 are equal, but L2 is much larger than L1 (about 3-4 times), so M2 is much larger than M1, which requires the fixed extra-wide guide rail to be stronger. According to strength calculations, the thickness of the guide rail is about 60 mm, while the conventional guide rail is only 2 15 mm thick angle steels, which weigh about 6 times as much as the conventional guide rail. Take a 1400TEU container ship as an example. If the entire ship uses extra-wide rails, the empty ship weight will increase by about 700 tons compared to conventional rails, which greatly increases the cost of the ship and reduces the ship's loading capacity.

[0008] In summary, the disadvantage of the mobile rail rack is that it is inconvenient to move and can only be moved as a whole. The entire cargo hold can only hold one of the two types of boxes, 40 feet or 45 feet, and cannot be mixed. Compared with the fixed extra-wide rail and the movable rail, although the loading operation is convenient and does not require moving back and forth, and the 40-foot and 45-foot containers can be mixed at will, the increased steel consumption is huge, which seriously affects the economic efficiency. Summary of the invention

[0009] The purpose of the present invention is to provide a lashing arrangement structure suitable for mixed loading of containers of two sizes in a cargo hold, which solves the shortcomings of the existing design such as inflexible operation and high cost on the basis of meeting the container loading requirements of the shipowner.

[0010] The present invention adopts the following technical solutions:

[0011] A lashing arrangement structure for mixed loading of two lengths of containers in a cargo hold of a container ship, wherein the two lengths of containers are divided into a longer container and a shorter container; the length direction of the cargo hold of the container ship is arranged to accommodate two longer containers; the end face of the cargo hold wall is arranged to have a plurality of holes 1 corresponding to the size of the end face of the container, and a pair of lashing eye rings 3 for fixing one end of a lashing rod 4 is provided on the upper side or the lower side of the edge of each hole; when the shorter container is loaded in the cargo hold, the end face of the container adjacent to the cargo hold wall is retracted away from the cargo hold wall by a gap; one end of the lashing rod 4 is lashed and fixed to the lashing eye ring 3, and the other end is fixed to the lashing hole 5 of the container in the diagonal direction, thereby fixing the shorter container and maintaining the retracted gap; the cargo hold wall is provided with an extension platform 6 for walking of lashing operators at a position corresponding to the height of each layer of containers.

[0012] The box has an extended platform 6 at a position corresponding to the height thereof for the lashing operators to walk on.

[0013] Preferably, the tying rods 4 are in pair and are cross-arranged.

[0014] Preferably, a plurality of reinforcing ribs 7 are provided between the extension platform 6 and the cargo hold wall, and each reinforcing rib 7 is provided with a through hole for the lashing operators to pass through.

[0015] Preferably, the lashing eye 3 is provided on the lower side of the edge of each hole, the lower end of the lashing rod 4 is lashed and fixed to the lashing eye 3, and the upper end is fixed to the lashing hole 5 on the upper part of the container.

[0016] Preferably, the lashing eye 3 is provided on the lower side of the edge of each hole, the lower end of the lashing rod 4 is lashed and fixed to the lashing eye 3, and the upper end is fixed to the lashing hole 5 at the lower part of the upper container.

[0017] Preferably, the two sizes of containers are containers with a length of 40 inches and 45 inches respectively, and the heights and widths of the two sizes of containers are the same.

[0018] The beneficial effects of the present invention are:

[0019] 1) It can meet the requirements of any mixed loading of two different sizes (such as 40 and 45 feet) in the cargo hold without losing the stack weight;

[0020] 2) Flexible arrangement of lashing positions according to actual loading conditions, easy operation;

[0021] 3) Compared with the extra-wide large guide rail, it saves a lot of steel weight and is more economical.

[0022] 4) Compared with the mobile guide frame, there is no need to move the guide frame, no need to use a crane, and the operation is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a three-dimensional schematic diagram of a container guide rail frame in the prior art.

[0024] Figure 2 yes Figure 1 Schematic diagram of storing containers inside a container rail rack.

[0025] Figure 3 This is a partial view from a top-down perspective of the movable rail rack storing a 40-inch container.

[0026] Figure 4 This is a comparison of the top-down perspective of 45-inch and 40-inch containers stored on fixed extra-wide rails.

[0027] Figure 5 It is an overall appearance diagram of a lashing arrangement structure for mixed loading of containers of two lengths in a cargo hold of a container ship according to the present invention.

[0028] Figure 6 yes Figure 5 A partial enlarged view of .

[0029] In the figure, 1. hole, 3. lashing eye, 4. lashing rod, 5. lashing hole, 6. extension platform. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] See also Figure 5-Figure 6 A lashing arrangement structure for mixed loading of two lengths of containers in a cargo hold of a container ship, wherein the two lengths of containers are divided into a longer container and a shorter container; the length direction of the cargo hold of the container ship is arranged to accommodate two longer containers; the end face of the cargo hold wall is arranged to have a plurality of holes 1 corresponding to the size of the end face of the container, and a pair of lashing eye rings 3 for fixing one end of a lashing rod 4 is arranged on the upper side or the lower side of the edge of each hole; when a shorter container is loaded in the cargo hold, the end face of the container adjacent to the cargo hold wall is retracted away from the cargo hold wall by a gap; one end of the lashing rod 4 is lashed and fixed to the lashing eye ring 3, and the other end is fixed to the lashing hole 5 of the container in the diagonal direction, thereby fixing the shorter container and maintaining the retracted gap; the cargo hold wall is provided with an extension platform 6 for walking of lashing operators at a position corresponding to the height of each layer of containers.

[0032] In this embodiment, see Figure 6 The tying rods 4 are in pair and are cross-arranged.

[0033] See also Figure 6 There are a plurality of reinforcing ribs 7 between the extension platform 6 and the cargo hold wall, and each reinforcing rib 7 is provided with a through hole for the lashing operators to pass through.

[0034] In this embodiment, see Figure 6 The lower side of the edge of each hole is provided with a lashing eye ring 3, the lower end of the lashing rod 4 is lashed and fixed to the lashing eye ring 3, and the upper end is fixed to the lashing hole 5 on the upper part of the container.

[0035] Continue to see Figure 6 The lower side of the edge of each hole is provided with a tying eye ring 3, the lower end of the tying rod 4 is tied and fixed to the tying eye ring 3, and the upper end is fixed to the tying hole 5 at the lower part of the upper container.

[0036] In this embodiment, the two sizes of containers are containers with a length of 40 inches and 45 inches respectively, and the heights and widths of the two sizes of containers are the same.

[0037] This patent is based on the use of conventional rails in the cargo hold, combined with appropriate lashing and fastening, to meet the requirements of mixing 40-foot and 45-foot containers in the cargo hold without reducing the loading weight. It breaks through the traditional concept that only containers on the open deck need to be lashed, while those in the cargo hold do not need to be lashed.

[0038] Specific combination again Figure 5-6 , specific examples:

[0039] The cargo hold 40- and 45-foot container mixed lashing system consists of two parts: rails and lashing parts. The rail system is used to fix 45-foot containers. For loaded 40-foot containers, the lashing form is determined by lashing calculation according to the container weight, loading position, etc., so that lashing can be achieved wherever it is needed.

[0040] Guide rail: The guide rail is designed according to the conventional method, and is generally composed of two 150mm×150mm×15mm angle steels, which are fixed to the front and rear transverse bulkheads of each cargo hold through brackets to fix 45-foot containers. There are vertical structural strong members inside the transverse bulkheads and at the positions corresponding to the guide rails to withstand the container force transmitted by the guide rails.

[0041] Lashings: 40-foot containers are too short to fit in the rails, so they need to be tied to avoid reducing the stack weight. Lashing eyes 3 are set on each platform of the transverse bulkhead near the vertical structural strength member, and the 40-foot container is fixed to the lashing eyes by lashing rods.

[0042] In addition to the vertical structural members corresponding to the guide rails, a platform (such as Figure 5-6As shown in the figure, it is for dock workers to pass through and perform lashing operations. Large holes need to be opened on the transverse bulkheads except for vertical members and platforms to facilitate workers to stand on the platform to operate containers. In order to make the mixed loading of 40-foot and 45-foot containers more flexible, it is necessary to be able to lash 40-foot containers in every possible position. The platform height is generally consistent with the container height. Each layer of containers has a corresponding platform, and lashing eyes must be set at each position.

[0043] The present invention breaks through the traditional concept that containers in the cargo hold cannot be tied, and cleverly combines conventional guide rails and pull-rod type lashing to form a lashing system that adapts to the mixed loading of containers of different lengths; it meets the requirements of any mixed loading of two different sizes in the cargo hold without losing stack weight; it flexibly arranges the lashing position according to the actual loading situation, and the operation is simple; compared with the extra-wide large guide rails, it saves a lot of steel weight and has good economy; compared with the movable guide rail frame, there is no need to move the guide rail frame, no need to use a crane, and the operation is simpler.

[0044] The above are preferred embodiments of the present invention. A person skilled in the art may make various changes or improvements on this basis. Without departing from the general concept of the present invention, these changes or improvements should fall within the scope of protection claimed by the present invention.

Claims

1. A lashing arrangement structure for mixed loading of containers of two lengths in a cargo hold of a container ship, characterized in that: There are two types of containers: longer containers and shorter containers; the length direction of the container ship's cargo hold is set to accommodate two longer containers; The end face of the cargo hold wall is provided with a plurality of holes (1) corresponding in size to the end face of the container, and a pair of lashing eyelets (3) for fixing one end of a lashing rod (4) is provided on the upper side or the lower side of the edge of each hole; When a shorter container is loaded in the cargo hold, the end face of the container adjacent to the cargo hold wall is retracted from the cargo hold wall by a gap; One end of the lashing rod (4) is lashed and fixed to the lashing eye (3), and the other end is fixed to the lashing hole (5) of the container in the diagonal direction, thereby fixing the shorter container and maintaining the retracted gap; The cargo hold wall is provided with an extension platform (6) at a position corresponding to the height of each layer of containers, for lashing operators to walk on.

2. The lashing arrangement structure for mixed loading of containers of two lengths in a container ship cargo hold according to claim 1, characterized in that: The tying rods (4) are in pair and are arranged crosswise.

3. The lashing arrangement structure for mixed loading of containers of two lengths in a container ship cargo hold according to claim 1, characterized in that: A plurality of reinforcing ribs (7) are provided between the extension platform (6) and the cargo hold wall, and each reinforcing rib (7) is provided with a through hole for lashing operators to pass through.

4. The lashing arrangement structure for mixed loading of containers of two lengths in a container ship cargo hold according to claim 1, characterized in that: The lower side of the edge of each hole is provided with a lashing eye (3), the lower end of the lashing rod (4) is lashed and fixed to the lashing eye (3), and the upper end is fixed to the lashing hole (5) on the upper part of the container.

5. The lashing arrangement structure for mixed loading of containers of two lengths in a container ship cargo hold according to claim 1, characterized in that: The lower side of the edge of each hole is provided with a lashing eye ring (3), the lower end of the lashing rod (4) is lashed and fixed to the lashing eye ring (3), and the upper end is fixed to the lashing hole (5) at the lower part of the upper container.

6. The lashing arrangement structure for mixed loading of containers of two lengths in a cargo hold of a container ship according to claim 1, characterized in that: The two sizes of containers are containers with a length of 40 inches and 45 inches respectively, and the heights and widths of the two sizes of containers are the same.

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