A method for phased installation of unloading platform sections on bulk carriers

Abstract

This invention proposes a method for the phased installation of unloading plates for bulk carriers, relating to the field of bulk carrier technology, including the following steps: (1) Initial stage: setting the position for the division of sections, dividing the trough-shaped bulkhead sections and unloading plates into bottom sections; (2) Sectioning stage: pre-assembling the trough-shaped bulkhead sections of the bottom section and the trough-shaped bulkhead sections of the trough-shaped bulkhead sections; uniformly pressing the pre-assembled plates into a whole, and then assembling them as a whole; after pressing and assembly, separating the trough-shaped bulkhead sections of the bottom section and the trough-shaped bulkhead sections of the trough-shaped bulkhead sections; installing the trough-shaped bulkhead sections of the bottom section onto the bottom pier on a horizontal jig, and then installing the unloading plates, thereby completing the installation of the components in the bottom pier; hoisting the components in the bottom pier onto the inner bottom plate for installation, thereby completing the installation of the bottom section; (3) Slipway stage: completing the overall positioning and welding of the bottom section and the trough-shaped bulkhead sections on the slipway.

Description

Technical Field

[0001] This invention relates to the field of bulk carrier technology, and more specifically to a method for the phased installation of unloading plates on bulk carriers. Background Technology

[0002] Typically, the trough-shaped bulkheads of bulk carriers are divided into sections along the top plate of the bottom pier, completely separating the trough-shaped bulkhead from the bottom pier. This makes the trough-shaped bulkhead a single, integrated unit, which is relatively easy to manufacture. However, because the top plate of the bottom pier is a slope, the trough-shaped bulkhead and the bottom pier create a recessed structure. To prevent water accumulation in this recessed structure or cargo accumulation during loading and unloading, unloading ramps need to be designed at the recessed locations of the trough-shaped bulkhead and the bottom pier. For example... Figure 1 As shown, the original sectional division completely separated the bulkhead and the bottom block into different sections. When the bulkhead sections and the bottom section were joined together on the slipway, a large number of unloading plates needed to be installed. During the installation of the unloading plates, welding the joints between the unloading plates and the top plate of the bottom block would damage the paint on the surface of the bottom block top plate. Since the paint on the surface of the bottom block top plate was completed during the sectioning stage, this would affect the integrity of the ballast tanks and prolong the ship's construction cycle. In addition, the installation of unloading plates on the slipway is very difficult. When the unloading plates are installed, the deck section has already been built, so cranes cannot be used. Hoists must be used to pull the unloading plates from the bottom of the hold to the top of the bottom block, posing safety hazards such as working at height. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention proposes a method for installing unloading plates in sections on bulk carriers. This method completes the installation of unloading plates in sections, ensuring the integrity of ballast tanks, reducing installation difficulty, and minimizing operational safety hazards.

[0004] The technical solution of this invention is implemented as follows:

[0005] A method for phased installation of unloading pallets on a bulk carrier includes the following steps:

[0006] (1) Initial stage: Set the position of the segment division, and divide the trough-shaped bulkhead and unloading plate into the bottom segment;

[0007] (2) Segmentation stage: Pre-assemble the trough-shaped wall panels of the bottom segment and the trough-shaped bulkhead segment; uniformly press the pre-assembled panels into a whole, and then assemble them as a whole; after pressing and assembly, separate the trough-shaped wall panels of the bottom segment and the trough-shaped bulkhead segment; install the trough-shaped wall panels of the bottom segment onto the bottom pier on a horizontal jig, and then install the unloading plate, thereby completing the installation of the components in the bottom pier; hoist the components in the bottom pier onto the inner bottom plate for installation, thereby completing the installation of the bottom segment;

[0008] (3) Slipway stage: The bottom section and the trough-shaped bulkhead section are assembled, positioned and welded on the slipway.

[0009] Preferably, in step (1), after changing the segment division position, when making the CNC nesting book, the bottom segment of the trough wall panel and the trough wall panel of the trough cabin wall segment are placed together so that materials of the same shape can be transported and processed together.

[0010] Preferably, in step (2), the joints of the pre-assembled trough-shaped wall panels of the bottom segment and the trough-shaped bulkhead segment are fixed by positioning welding.

[0011] Preferably, in step (2), the pre-assembled plates are uniformly pressed into a single form, and then assembled into a complete trough-shaped bulkhead. The trough-shaped bulkhead is reinforced by using interlocking channel steel to reinforce and fix the bottom segment of the trough-shaped wall panel and the port of the trough-shaped wall panel segment of the trough-shaped bulkhead.

[0012] Preferably, in step (2), after the molding and assembly are completed, the positioning weld of the splice seam is removed, and the bottom segment of the trough wall panel and the trough wall panel of the trough cabin wall segment are separated.

[0013] Preferably, in step (2), the bottom segment of the trough wall panel and the bottom pier are installed on the horizontal jig with the side that needs to be installed on the unloading plate facing upwards. The welds of the bottom segment of the trough wall panel and the bottom pier are opened with double-sided bevels and are welded in the form of full penetration.

[0014] Preferably, in step (2), the welds of the unloading plate and the bottom section of the trough wall plate and the top plate of the bottom pier are all opened with an outer bevel and welded in a single-sided full penetration manner.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] By adopting the above scheme, the installation of the unloading plaques is moved from the slipway stage to the section stage. The section-stage installation of the unloading plaques is completed in the workshop, and the installation is a horizontal operation; cranes can be used for easy installation. Furthermore, installation is carried out on horizontal jigs, resulting in higher welding efficiency. With the unloading plaques installed in the section stage, the structural integrity of the compartments below the pier is high. The section-stage installation of the unloading plaques also provides a better workshop environment, eliminating the need for extensive scaffolding and other ventilation equipment, and avoiding safety hazards caused by overlapping operations during the slipway stage. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the bottom segmentation of the existing technology;

[0019] Figure 2 This is a schematic diagram of the bottom segmentation of the present invention;

[0020] Figure 3 This is a schematic diagram of the pre-assembled groove wall panel structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the integral pressing structure of the grooved wall panel of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure for reinforcing the grooved wall panel of the present invention;

[0023] Figure 6 for Figure 5 Cross-sectional view along direction AA;

[0024] Figure 7 This is a plan view of the installation of the trough-shaped wall panel and the unloading plate of the present invention;

[0025] Figure 8 This is a schematic diagram of the welding joint between the trough-shaped wall panel and the unloading plate of the present invention;

[0026] Figure 9 for Figure 8 Detailed drawing of section I;

[0027] Figure 10 for Figure 8 Detailed drawings of section II;

[0028] Figure 11 for Figure 8 Detailed drawings of section III;

[0029] Figure 12 This is a schematic diagram of the segmented installation of the present invention;

[0030] Figure 13 A schematic diagram of the installation process during the invention process on the slipway.

[0031] Attached diagram labels: 1-Bottom pier; 101-Bottom pier top plate; 2-Trough-shaped wall panel; 3-Unloading plate; 4-Horizontal jig; 5-Interlocking channel steel; 6-Trough-shaped wall panel template. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," "third," and "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] This embodiment proposes a method for phased installation of unloading pallets on bulk carriers, including the following steps:

[0036] (1) Initial stage: such as Figure 2 As shown, the segmentation position is set, dividing the trough-shaped bulkhead section and the unloading plate into the bottom section; that is, the segmentation boundary is moved from the top plate of the bottom pier upwards to 500mm above the top of the unloading plate.

[0037] (2) Segmented Stages: such as Figure 12 As shown, the bottom segment trough-shaped wall panels and the trough-shaped bulkhead segments are pre-assembled; the pre-assembled panels are then uniformly pressed into a single form, and then assembled as a whole; after pressing and assembly, the bottom segment trough-shaped wall panels and the trough-shaped bulkhead segments are separated; the bottom segment trough-shaped wall panels are installed onto the bottom pier on a horizontal jig, and then the unloading plate is installed, thus completing the installation of the components in the bottom pier; the components in the bottom pier are hoisted onto the inner bottom plate for installation, thus completing the installation of the bottom segment.

[0038] (3) Slipway stage: such as Figure 13As shown, the bottom section and the trough-shaped bulkhead section are assembled, positioned, and welded on the slipway.

[0039] In this embodiment, in step (1), after changing the segment division position, when making the CNC nesting book, the bottom segmented trough wall plate 2 and the trough wall segmented trough wall plate 2 are placed together so that materials of the same shape can be transported and processed together.

[0040] In this embodiment, in step (2), as follows Figure 3 As shown, the pre-jointed splice seams of the bottom segment trough-shaped wall panel 2 and the trough-shaped bulkhead segment trough-shaped wall panel 2 are fixed with 100mm long positioning welds, and are not fully welded so that they can be disassembled later.

[0041] In this embodiment, in step (2), the pre-assembled panels are uniformly pressed to ensure that the subsequent shapes of the bottom segmented trough-shaped wall panel 2 and the trough-shaped bulkhead segmented trough-shaped wall panel 2 are completely consistent, such as... Figure 4 As shown, the trough-shaped wall panel 2 is pressed using the trough-shaped wall panel template 6, and then assembled into a complete trough-shaped bulkhead. This process reinforces the trough-shaped bulkhead. Figure 5 As shown, the ports of the trough-shaped wall panel 2 in the bottom section and the trough-shaped bulkhead section are reinforced and fixed using clamping channel steel 5. The clamping channel steel 5 is connected to the trough-shaped wall panel 2 with a clamping plate to facilitate subsequent dismantling and recycling. By reinforcing the ports of the two sections, misalignment is prevented when the bottom section and the trough-shaped bulkhead section are connected, which would affect the connection accuracy and welding quality of the bottom section and the trough-shaped bulkhead section.

[0042] In this embodiment, in step (2), after the molding and assembly are completed, the positioning weld of the splice seam is removed, and the bottom segmented trough wall panel 2 and the trough wall panel 2 of the trough bulkhead segment are separated.

[0043] In this embodiment, the unloading plate 3 has a trapezoidal cross-section.

[0044] In this embodiment, in step (2), as follows Figure 7 As shown Figure 11As shown, the bottom segment of the trough wall panel 2 and the bottom pier 1 are installed on the horizontal jig 4, with the side to be installed on the unloading plate 3 facing upwards. The welds of the bottom segment of the trough wall panel 2 and the bottom pier 1 are beveled on both sides and welded in a full penetration manner. Since all welding operations are in a horizontal position and are low-altitude operations, the construction personnel can use the most common flat fillet welding method, and the unloading plate 3 is beveled on one side to ensure full penetration. In step (2), the welds of the unloading plate 3 and the top plate of the bottom segment of the trough wall panel 2 and the bottom pier 1 are all beveled on the outside and welded in a single-sided full penetration manner. At the same time, it avoids construction personnel from entering confined spaces to work. To further address the technical issue of unreliable welding quality in the space enclosed by the unloading plate 3, the bottom pier top plate 101, and the channel wall panel 2, the fillet welds of the bottom segment of the channel wall panel 2 and the bottom pier top plate 101 are welded first. After smoothing and flaw detection, the unloading plate 3 is installed. Following the installation of the unloading plate 3, the surface of the bottom pier top plate is painted.

[0045] In this embodiment, the unloading plate does not need to be spot-welded to the trough-shaped bulkhead, eliminating the safety hazards associated with transporting the trough-shaped bulkhead sections from the section stage to the slipway stage. In existing methods, the spot-welded unloading plates at the section stage may detach during transport due to pressure or collisions between sections, potentially causing safety accidents. However, the unloading plate of this invention is installed on the bottom pier section at the section stage, avoiding the risk of detachment during vertical lifting to the slipway. Furthermore, this invention eliminates the safety hazards during unloading plate installation. Existing methods involve spot-welding the unloading plate to the trough-shaped section at the section stage. During installation at the slipway stage, the spot welds must be cut, posing a risk of slippage. Since each unloading plate weighs over 500 kg and can only be installed using hoists, workers are at risk of being bumped or crushed during this process. In contrast, the unloading plate of this invention is already installed at the section stage, avoiding the safety hazards of slippage and crushing caused by cutting the spot welds.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for phased installation of unloading platforms for bulk carriers, characterized in that: The steps include: (1) Initial stage: Set the position of the segment division, and divide the trough-shaped bulkhead section and the unloading plate into the bottom section; (2) Segmentation stage: Pre-assemble the bottom segmented trough-shaped wall panels and the trough-shaped bulkhead segmented trough-shaped wall panels; The pre-assembled panels are uniformly pressed into a single form, and then assembled as a whole. After pressing and assembly, the bottom segmented trough-shaped wall panels and the trough-shaped bulkhead segments are separated. The bottom segmented trough-shaped wall panels are installed onto the bottom pier on a horizontal jig, and then the unloading plate is installed, thereby completing the installation of the components in the bottom pier. The components in the bottom pier are hoisted onto the inner bottom plate for installation, thereby completing the installation of the bottom segment. (3) Slipway stage: Complete the overall assembly, positioning and welding of the bottom section and the trough-shaped bulkhead section on the slipway; In step (1), after changing the segment division position, when making the CNC nesting book, the bottom segment of the trough wall panel and the trough wall panel of the trough cabin wall segment are placed together so that materials of the same shape can be transported and processed together. In step (2), the pre-assembled plates are uniformly pressed into a single form, and then assembled into a complete trough-shaped bulkhead. The trough-shaped bulkhead is reinforced by using interlocking channel steel to reinforce and fix the bottom section of the trough-shaped bulkhead and the port of the trough-shaped bulkhead section. The bottom section of the trough-shaped bulkhead and the bottom block are installed on a horizontal jig with the side that needs to be installed facing upwards. The welds of the bottom section of the trough-shaped bulkhead and the bottom block are opened with double-sided bevels and welded in a full-penetration manner.

2. The method for phased installation of unloading platform sections on a bulk carrier according to claim 1, characterized in that... In step (2), the joints of the pre-assembled trough-shaped wall panels of the bottom section and the trough-shaped bulkhead section are fixed by positioning welding.

3. The method for phased installation of unloading platforms for bulk carriers according to claim 1, characterized in that... In step (2), after the molding and assembly are completed, the positioning weld of the splicing seam is removed, and the bottom segmented trough wall panel and the trough wall panel segmented into the trough wall are separated.

4. The method for phased installation of unloading platforms for bulk carriers according to claim 1, characterized in that... In step (2), the welds of the unloading plate and the bottom section of the trough wall plate and the top plate of the bottom pier are all opened with an outer bevel and welded in a single-sided full penetration manner.

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