LNG ship cargo hold bottom wedge installation adjustment method and device
By placing a hollow column structure on the surface of the wedge block at the bottom of the LNG ship's cargo hold, the problem of interference from the support legs was solved, the wedge block was precisely adjusted, and the installation quality of the insulation module and the performance of the cargo hold were ensured.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUDONG ZHONGHUA SHIPBUILDINGGROUP
- Filing Date
- 2026-06-09
- Publication Date
- 2026-07-24
AI Technical Summary
The installation and adjustment of the reference wedge block on the inner wall of the LNG ship's cargo hold is interfered with by the support legs, resulting in a decrease in installation accuracy and affecting the installation quality of the secondary insulation module and the performance of the cargo hold.
An adjustment device for wedge blocks at the bottom of the cargo hold of an LNG ship is adopted. By placing hollow column structures of equal height on the surface of the wedge block, the meter measurement is ensured to be free from interference from the support legs, and the height of the wedge block is adjusted to meet the accuracy requirements.
Precise adjustment of the wedge height in the interference area of the support leg ensured the installation quality of the secondary insulation module and the overall performance of the cargo compartment.
Smart Images
Figure CN122443645A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of shipbuilding technology, and in particular to a method and apparatus for installing and adjusting wedge blocks at the bottom of an LNG carrier cargo hold. Background Technology
[0002] The installation and adjustment of the reference wedges on the inner bulkhead of an LNG carrier cargo hold is a crucial step in the construction of the cargo hold's inner bulkhead enclosure system. Its installation accuracy directly determines the installation quality of the secondary insulation modules, thus affecting the cargo hold's insulation, sealing performance, and overall structural reliability. Currently, the standard installation and adjustment process for the reference wedges is as follows: First, in the early stages of construction, a laser tracker is used to measure the relative height of the bulkhead base points to obtain the overall deformation of the inner bulkhead. Then, the measured data is input into specialized software for calculation to obtain the target height values required for leveling each base point. Next, reference wedges of the corresponding height are placed at the corresponding base points according to these target height values, and the height of the reference wedges is finely adjusted according to a preset error standard, as shown in the attached figure. Figure 3 and attached Figure 4 As shown, the gap error of the reference wedges within a 3-meter range must be controlled within ±1.2mm in the middle and within ±2.4mm at both ends. After adjustment, the surfaces of all reference wedges form a unified reference plane. This reference plane provides a precise height reference for the installation of subsequent secondary insulation modules. During the adjustment process, the software calculation results must be manually checked to ensure that the calculated data matches the on-site construction requirements.
[0003] When installing the secondary insulation module, resin strips must first be applied to its mounting surface, and then it is laid on the aforementioned reference wedge. The resin strips are then pressed to match the height of the reference wedge. After fine polishing, the flatness and layer difference of the secondary insulation module meet the preset process requirements.
[0004] However, in actual construction, scaffolding modules need to be installed inside the LNG carrier cargo hold to assist in the construction of the entire inner bulkhead enclosure system. These scaffolding modules are supported and fixed by numerous support legs at their bottom, all located in the bottom area of the cargo hold. The placement of these support legs creates spatial barriers around the reference wedges, particularly those along the edge of the cargo hold bottom. This makes it impossible to use a conventional 4-meter ruler for precision testing and adjustment during the installation and adjustment of the reference wedges in this area, thus affecting the installation accuracy of the reference wedges and compromising the installation quality of subsequent secondary insulation modules. Ultimately, this could affect the overall performance of the cargo hold. Therefore, a reference wedge installation and adjustment solution that can resolve the aforementioned support leg interference problem is urgently needed. Summary of the Invention
[0005] To address the shortcomings of existing technologies, this application provides a method and apparatus for installing and adjusting the bottom wedge block of an LNG carrier cargo hold, thereby solving the technical problems in existing technologies, such as the installation and adjustment of the reference wedge block on the inner wall of the LNG carrier cargo hold being affected by the support legs and the inability to guarantee the secondary insulation module.
[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: A method for installing and adjusting bottom wedges in the cargo hold of an LNG carrier includes the following steps: Bases are evenly distributed at the bottom of the cargo hold, and support legs are placed between the bases. Step 1: Calculate the target height value required for leveling each base. Based on the target height value, place wedges of the corresponding height on the corresponding base. In the area where the support legs are placed on the bottom of the cargo hold, place an LNG ship cargo hold bottom wedge installation and adjustment device of equal height on the surface of each wedge. The height of the LNG ship cargo hold bottom wedge installation and adjustment device is greater than the height of the support leg, and the LNG ship cargo hold bottom wedge installation and adjustment device is perpendicular to the wedge. Step 2: Place the measuring tape horizontally across the top of the LNG ship cargo hold bottom wedge installation and adjustment device, keeping the measuring tape horizontal. The wedge where the LNG ship cargo hold bottom wedge installation and adjustment device is located, with the distance between the top of the measuring tape and the measuring tape greater than the error value, is the wedge to be adjusted. Use a gap gauge to measure the gap between the measuring tape and the top of the LNG ship cargo hold bottom wedge installation and adjustment device to obtain the height value that the wedge to be adjusted needs to be adjusted. Step 3: Remove the measuring tape, install the adjustment device on the bottom wedge of the LNG ship cargo tank on the wedge to be adjusted, and place a new wedge at the location of the wedge to be adjusted. The height of the new wedge is equal to the sum of the height of the wedge to be adjusted and the height value to be adjusted. Step 4: Repeat steps 2 and 3 until the distance between the top of the wedge adjustment device at the bottom of the LNG ship's cargo hold and the measuring tape is less than or equal to the error value.
[0007] In one embodiment, the meter stick is 4 meters long, and within a 3-meter range, the error between the wedges at both ends of the meter stick and the meter stick is ±1.2 mm, and the error between the wedges at both ends of the meter stick and the meter stick is ±2.4 mm.
[0008] In one embodiment, the wedge mounting and adjustment device at the bottom of the LNG ship's cargo hold is a hollow column, the internal dimensions of which are larger than the dimensions of the base, and the external dimensions of which are smaller than the dimensions of the wedge.
[0009] The present application also provides an installation and adjustment device for the bottom wedge of the LNG ship cargo hold, which is used for the installation and adjustment method of the bottom wedge of the LNG ship cargo hold in the above method. The installation and adjustment device for the bottom wedge of the LNG ship cargo hold is a hollow column. The internal dimension of the hollow column is larger than the dimension of the base, and the external dimension of the hollow column is smaller than the dimension of the wedge. The installation and adjustment device for the bottom wedge of the LNG ship cargo hold is a square column, which is a "hui" - shaped structure surrounded by four plywood boards.
[0010] Advantages of the present invention: During the installation and adjustment of the bottom wedge of the LNG ship cargo hold in the present application, for the area where support legs are placed between the bases, an LNG ship cargo hold bottom wedge installation and adjustment device with the same height is placed on the surface of each wedge, so that the height at which the meter stick for measuring the accuracy of the wedge is used is greater than the height of the support legs, in order to install and adjust the wedge in the area where the support legs are placed, thus solving the problem that the support legs interfere with the installation and adjustment of the wedge. The LNG ship cargo hold bottom wedge installation and adjustment device used in the present application has a simple structure and is easy to use. It can accurately and conveniently adjust the wedge under special working conditions, ensuring the installation quality of the subsequent sub - layer insulation module and the overall performance of the cargo hold. Description of the drawings
[0011] Figure 1 is a schematic diagram of the distribution of the bases on the inner cabin wall surface of the LNG ship cargo hold; Figure 2 is a schematic diagram in which wedges are sleeved on the bases on the inner cabin wall of the LNG ship cargo hold; Figure 3 is a schematic diagram of using a meter stick to detect the accuracy of the wedge in the prior art; Figure 4 is a cross - sectional view of using a meter stick to detect the accuracy of the wedge in the prior art; [[ID=2》 Figure 5 is a schematic diagram of using a meter stick to detect the accuracy of the wedge in the embodiment of the present application; Figure 6 is a schematic diagram of using a clearance gauge to check the clearance in the embodiment of the present application; Figure 7 is a schematic diagram of the structure of the LNG ship cargo hold bottom wedge installation and adjustment device in the embodiment of the present application. <^
[0012] Reference numerals: 01, meter stick; 02, clearance gauge; 1, base; 2, wedge; 3, support leg; 4, LNG ship cargo hold bottom wedge installation and adjustment device. Detailed implementation manners
[0013] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.
[0014] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.
[0015] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."
[0016] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical connection or internal connection between two components. They can be direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.
[0017] To better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.
[0018] This embodiment provides a method for installing and adjusting the bottom wedge blocks of an LNG carrier cargo hold, such as... Figure 5-7 As shown, bases 1 are evenly distributed at the bottom of the cargo hold of an LNG ship, and support legs 3 are placed between the bases 1. The process includes the following steps: Step 1: Calculate the target height value required for leveling each base 1. Place wedges 2 of corresponding height on the corresponding base 1 according to the target height value. In the area where the support legs 3 are placed on the bottom of the cargo hold, place the LNG ship cargo hold bottom wedge installation and adjustment device 4 of equal height on the surface of each wedge 2. The height of the LNG ship cargo hold bottom wedge installation and adjustment device 4 is greater than the height of the support legs 3. The LNG ship cargo hold bottom wedge installation and adjustment device 4 is perpendicular to the wedge 2. Step 2: Horizontally place the meter stick 01 across the top of the wedge installation and adjustment device 4 at the bottom of the LNG ship cargo hold. Keep the meter stick 01 level. The wedge of the wedge installation and adjustment device 4 at the bottom of the LNG ship cargo hold, where the distance between the top end and the meter stick 01 is greater than the error value, is the wedge to be adjusted. Use the gap gauge 02 to measure the gap between the meter stick 01 and the top end of the wedge installation and adjustment device 4 at the bottom of the LNG ship cargo hold, and obtain the height value that the wedge 2 to be adjusted needs to be adjusted. Step 3: Remove the meter stick 01, the wedge installation and adjustment device 4 on the wedge to be adjusted, and the wedge to be adjusted. Place a new wedge at the position of the wedge to be adjusted. The height of the new wedge is equal to the sum of the height value of the wedge to be adjusted and the height value that needs to be adjusted. Step 4: Repeat Step 2 and Step 3 until the distance between the top end of the wedge installation and adjustment device 4 at the bottom of the LNG ship cargo hold and the meter stick 01 is less than or equal to the error value.
[0019] In this embodiment, the meter stick 01 is a 4-meter-long meter stick. Within the range of 3 meters, the error value between the wedges at both ends of the middle of the meter stick and the meter stick is ±1.2 mm, and the error value between the wedges at both ends of the meter stick and the meter stick is within ±2.4 mm.
[0020] In order to stably place the wedge installation and adjustment device 4 at the bottom of the LNG ship cargo hold on the surface of the wedge, in this embodiment, the wedge installation and adjustment device 4 at the bottom of the LNG ship cargo hold is a hollow column. The internal size of the hollow column is larger than the size of the base 1, and the external size of the hollow column is smaller than the size of the wedge. In Step 1, the wedge installation and adjustment device 4 at the bottom of the LNG ship cargo hold is placed coaxially with the wedge 2.
[0021] As Figure 7 shown, the wedge installation and adjustment device 4 at the bottom of the LNG ship cargo hold is a square column, a "hui"-shaped structure surrounded by four plywood boards. The radius of the base 1 is 20 mm, the size of the cross-section of the wedge 2 is 120*120 mm, the outer dimension of the wedge installation and adjustment device 4 at the bottom of the LNG ship cargo hold is 80*80 mm, and the thickness of the plywood board is 9 mm.
[0022] Reference numerals: 01, meter stick; 02, gap gauge; 1, base; 2, wedge; 3, support leg; 4, wedge installation and adjustment device at the bottom of the LNG ship cargo hold.
[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that it is still possible to modify the specific implementation manners of the invention or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.
Claims
1. A method for installing and adjusting wedge blocks at the bottom of an LNG carrier cargo hold, characterized in that, There are pedestals evenly distributed at the bottom of the inner cabin of the LNG ship's cargo hold, and support legs are placed between the pedestals, including the following steps: Step 1: Calculate the target height values required for leveling each pedestal. Place wedges with corresponding heights on the corresponding pedestals according to the target height values. In the area of the cargo hold bottom where the support legs are placed, place LNG ship cargo hold bottom wedge installation and adjustment devices with the same height on the surface of each wedge. The height of the LNG ship cargo hold bottom wedge installation and adjustment device is greater than the height of the support leg, and the LNG ship cargo hold bottom wedge installation and adjustment device is perpendicular to the wedge; Step 2: Place a meter stick horizontally across the top of the LNG ship cargo hold bottom wedge installation and adjustment device. Keep the meter stick level. The wedge where the LNG ship cargo hold bottom wedge installation and adjustment device with a distance greater than the error value from the top of the meter stick is the wedge to be adjusted. Use a gap gauge to measure the gap between the meter stick and the top of the LNG ship cargo hold bottom wedge installation and adjustment device to obtain the height value that the wedge to be adjusted needs to be adjusted; Step 3: Remove the meter stick, the LNG ship cargo hold bottom wedge installation and adjustment device on the wedge to be adjusted, and the wedge to be adjusted. Place a new wedge at the position of the wedge to be adjusted. The height of the new wedge is equal to the sum of the height value of the wedge to be adjusted and the height value that needs to be adjusted; Step 4: Repeat Step 2 and Step 3 until the distance between the top of the LNG ship cargo hold bottom wedge installation and adjustment device and the meter stick is less than or equal to the error value.
2. The method for installing and adjusting the bottom wedge block of an LNG carrier cargo hold according to claim 1, characterized in that, The meter stick is a meter stick with a length of 4 meters. Within a range of 3 meters, the error value between the wedges at both ends in the middle of the meter stick and the meter stick is ±1.2 mm, and the error value between the wedges at both ends of the meter stick and the meter stick is ±2.4 mm.
3. The method for installing and adjusting the bottom wedge block of an LNG carrier cargo hold according to claim 2, characterized in that, The LNG ship cargo hold bottom wedge installation and adjustment device is a hollow column. The internal dimension of the hollow column is greater than the dimension of the pedestal, and the external dimension of the hollow column is less than the dimension of the wedge.
4. The method for installing and adjusting the bottom wedge block of the LNG ship cargo hold according to claim 3, characterized in that, In Step 1, the LNG ship cargo hold bottom wedge installation and adjustment device is placed coaxially with the wedge.
5. A device for installing and adjusting wedge blocks at the bottom of an LNG carrier cargo hold, characterized in that, For the LNG ship cargo hold bottom wedge installation and adjustment method used in any one of the methods as claimed in claim 1, the LNG ship cargo hold bottom wedge installation and adjustment device is a hollow column. The internal dimension of the hollow column is greater than the dimension of the pedestal, and the external dimension of the hollow column is less than the dimension of the wedge. The LNG ship cargo hold bottom wedge installation and adjustment device is a square column, a "return" - shaped structure formed by four plywood boards.