A reference pad for a thin film type enclosure system and a method of installation

Abstract

A kind of benchmarking of thin film type enclosure system and installation method, benchmarking includes square benchmarking and rectangular benchmarking, benchmarking needs to be opened with the same or slightly deep circular groove of nut thickness in the position of installing fixed nut, so that formal installation can be hidden in fixed nut, ensure that the upper surface is flush, do not affect the installation of subsequent insulation board;In the center position of recess, hole is opened, so that the welding stud on the hull inner shell passes through to fix the new benchmarking;In the position without installing nut, the thickness of new benchmarking is reduced, so as to realize the effect of weight reduction and cost reduction.When installing, the original welding stud is used to fix the benchmarking to any height, so as to realize the height adjustment of benchmarking, realize the close fit of insulation board and benchmarking.The present application is convenient, safe and reliable, ensures the installation accuracy of benchmarking, improves construction efficiency, and can avoid the risk of falling and deformation.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding and design, and specifically relates to a reference pad for a membrane-type enclosure system and its installation method. Background Technology

[0002] The MARK-type membrane enclosure system is used as a non-independent cargo tank form, such as Figure 1 As shown, its construction relies on the unfolding of the hull. However, due to the unavoidable deformation of the plates during the hull's segmented construction and final assembly, the hull cannot achieve absolute flatness. Therefore, in the early stages of the containment system construction, after the marking is completed, reference blocks of different thicknesses need to be laid according to the degree of deformation of the hull to provide a relatively flat environment for the subsequent installation of the containment system components. At the same time, before the resin strips under the insulation board are completely cured, the reference blocks also serve to support the insulation board, preventing excessive compression of the resin strips by the insulation board. Figure 1 As shown, reference blocks are installed between the insulation plate 1 and the hull 3. Typically, six reference blocks are required under the flat insulation plate, including those at the ends and in the middle. Therefore, the construction of the enclosure system requires a large number of reference blocks.

[0003] The reference blocks currently used are made of plywood and have the following main problems:

[0004] Firstly, the plywood reference blocks are primarily fixed to the hull using double-sided tape. However, due to factors such as hull cleanliness, temperature, humidity, and the properties of the double-sided tape, some reference blocks may detach from the top, vertical, and upper inclined surfaces. This increases the need for repeated pre-construction inspections and reinstallation. Furthermore, fallen wooden blocks may damage already installed insulation or fall into gaps in the insulation, both of which are strongly avoided in current enclosure system construction. Therefore, this type of reference block poses certain safety hazards. Additionally, to prevent reference blocks from falling off, anti-fall nets and other devices need to be installed on-site, significantly increasing manpower and material costs.

[0005] Secondly, the specifications of plywood reference blocks are generally 0.5 / 1 / 2 / 4 / 5 / 6 / 8 / 10 / 12 mm, etc., with a minimum thickness difference of 0.5 mm between each specification. This means that during actual installation, if the gap between the insulation board and the hull of the ship is not a multiple of 0.5 mm, it is impossible to achieve a precise filling effect on the gap. This can result in gaps still existing between the reference block and the insulation board, or the insulation board being slightly pushed up. Furthermore, in the actual installation of insulation blocks, several specifications of insulation boards often need to be stacked, but the number of layers of reference blocks cannot exceed three. This means that the combination sometimes cannot meet the precise usage requirements. This is an inherent characteristic of existing reference blocks and is difficult to avoid. All of these factors will lead to a decrease in the installation accuracy of the insulation board.

[0006] Thirdly, the reference blocks currently used are mainly divided into two types: main reference blocks and auxiliary reference blocks. Since the degree of deformation of the hull cannot be predicted before the hull is formed, the amount of plywood reference blocks needed cannot be estimated in advance. To avoid installation delays due to insufficient quantities of certain reference blocks during actual construction and installation, the ordering margin for reference blocks of various specifications is usually greatly increased. For a large LNG carrier with a volume of 175,000 cubic meters, the typical ordering quantity for reference block 2 would reach over 130,000 pieces, leading to material accumulation and waste.

[0007] Finally, due to the nature of plywood, it must be stored in a dry environment. If it gets damp, the reference pad will expand and deform, and the actual thickness of the reference pad will deviate from the theoretical thickness when it was ordered, affecting the accuracy of on-site installation.

[0008] All of the above problems will lead to a waste of human and material resources, increase construction costs, and even affect the overall construction cycle. Summary of the Invention

[0009] To address the aforementioned problems, this invention provides a reference pad for a membrane-type enclosure system and its installation method, aiming to achieve convenient, safe, reliable, precise, and quick installation of the reference pad for the membrane-type enclosure system. The technical solution adopted is as follows:

[0010] A reference pad for a membrane enclosure system and its installation method are disclosed. The reference pad includes a square reference pad and a rectangular reference pad. The square reference pad has a square reference plate. The front of the square reference plate has four downwardly recessed circular grooves symmetrically arranged, and a through hole is opened in the center of the circular groove. The back of the square reference plate has transverse reinforcing ribs and longitudinal reinforcing ribs. The circular grooves form protrusions on the back of the square reference plate.

[0011] The rectangular reference block has a rectangular reference plate. The front of the rectangular reference plate has two downwardly recessed circular grooves. The back of the rectangular reference plate has transverse and longitudinal reinforcing ribs. The circular grooves form protrusions on the back of the rectangular reference plate.

[0012] The overall thickness of the reference pad is 4mm, the thickness of the square and rectangular reference plates is 2mm, and the depth of the circular groove is 2mm.

[0013] Square reference blocks are used at the intersection of the four insulating boards, and rectangular reference blocks are used at the ends and middle of the insulating boards.

[0014] The installation of the reference pad is as follows:

[0015] When the distance between the reference pad and the inner shell of the ship is equal to the thickness of the thin nut, the thin nut is located in the circular groove. The reference pad is placed between the inner shell of the ship and the insulating plate. The welding stud passes through the through hole in the center of the circular groove from the back of the reference pad. The thin nut is tightened on the welding stud and spot welded. Then the insulating plate to be installed is placed in the designated position. Washers and hexagonal nuts are installed on the welding stud in sequence.

[0016] When the distance between the reference pad and the inner shell of the ship is less than the thickness of the thin nut, lift the reference pad upward, install the shim under the reference pad, and spot weld it in place so that the distance between the reference pad and the inner shell of the ship is equal to the thickness of the thin nut. Then install it according to method one.

[0017] When the distance between the reference pad and the inner shell of the ship is greater than the thickness of the thin nut, first screw a thin nut onto the welding stud under the reference pad, and determine the installation height of the thin nut 7 below according to the thickness distribution diagram of the reference pad, and then spot weld it in place. After all the thin nuts under the reference pad have been adjusted and installed, place the reference pad on these thin nuts so that the distance between the reference pad and the inner shell of the ship is equal to the thickness of the thin nut, and then install it according to method one.

[0018] The aforementioned reference pad and installation method for a membrane-type enclosure system further divides the square reference plate into four square regions of the same size, with four circular grooves located at the center of each of the four regions.

[0019] Furthermore, in the aforementioned reference pad and installation method for a membrane-type enclosure system, the height of the reinforcing rib is 2mm.

[0020] Furthermore, in the aforementioned reference pad and installation method for a membrane-type enclosure system, the thickness of the thin nut is no greater than the depth of the circular groove.

[0021] Furthermore, in the aforementioned reference pad and installation method for a membrane-type enclosure system, the side length of the square pad is 190mm to 200mm.

[0022] Furthermore, in the aforementioned reference pad and installation method for a membrane-type enclosure system, the rectangular pad has a length of 190mm to 200mm and a width of 95mm to 100mm.

[0023] Furthermore, in the aforementioned reference pad and installation method for a membrane-type enclosure system, the reinforcing ribs of the square pad plate are respectively set at 1 / 2 and 1 / 4 of the side length.

[0024] Furthermore, in the aforementioned reference pad and installation method for a membrane-type enclosure system, the reinforcing ribs of the rectangular pad plate are respectively located at 1 / 2 of the length and 1 / 2 of the width.

[0025] The beneficial effects of this invention are:

[0026] 1. This reference block design avoids the risk of falling and increases the reliability of construction.

[0027] 2. This reference block can be adjusted to any height during installation, thereby achieving precise leveling of the insulation board and improving construction accuracy.

[0028] 3. When adjusting data or when the hull of the ship deforms, this type of reference pad can be quickly adjusted in height, improving construction efficiency.

[0029] 4. When the hull of the ship experiences significant flatness deformation, this pad can quickly level it without requiring multiple layers of resin for leveling.

[0030] 5. This basic pad avoids the risk of plywood warping due to moisture, which could lead to a decrease in precision.

[0031] 6. The use of this basic pad will significantly reduce order margins and improve order accuracy. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the layout of the reference blocks for the MARK type cargo containment system;

[0033] Figure 2 This is a schematic diagram of the front structure of the square and rectangular reference pads;

[0034] Figure 3 This is a cross-sectional view of the reference pad block;

[0035] Figure 4 This is a schematic diagram of the distribution of the reference pads;

[0036] Figure 5 This is a schematic diagram of the back structure of the square reference pad;

[0037] Figure 6This is a schematic diagram of the back structure of the rectangular reference block;

[0038] Figure 7 This is a diagram illustrating the installation process for Method 1;

[0039] Figure 8 This is a diagram illustrating the installation process for Method Two.

[0040] Figure 9 This is a diagram illustrating the installation process for Method 3;

[0041] Among them, 1-insulating plate, 2-square reference pad, 3-ship hull, 4-rectangular reference pad, 5-circular groove, 6-reinforcing rib, 7-thin nut, 8-welded stud, 9-hexagonal nut. Detailed Implementation

[0042] The invention will be further described with reference to the accompanying drawings.

[0043] A reference pad and installation method for a membrane-type enclosure system. The reference pad includes a square reference pad and a rectangular reference pad. The square reference pad has a square reference plate. The front of the square reference plate has four downwardly recessed circular grooves 5 symmetrically arranged. A through hole is opened in the center of the circular groove. The back of the square reference plate is provided with reinforcing ribs 6 in both the horizontal and vertical directions. The circular grooves form a protrusion on the back of the square reference plate. Four reinforcing ribs are arranged at equal intervals around the back of the circular grooves.

[0044] The rectangular reference block has a rectangular reference plate. The front of the rectangular reference plate has two downwardly recessed circular grooves 5. The back of the rectangular reference plate has transverse reinforcing ribs and longitudinal reinforcing ribs. The circular grooves form protrusions on the back of the rectangular reference plate.

[0045] The three-dimensional view of the reference pad is as follows Figure 2 As shown, the sectional view is as follows Figure 3 As shown. According to GTT's requirements for overall tank leveling, the minimum pad thickness is 4mm, so the overall thickness of the reference pad is set to 4mm, with a 2mm reduction in thickness at the edges and center.

[0046] Reference blocks need to be installed at the ends of all insulating boards and in the middle of some insulating boards. Depending on the specific installation location, two different outer contour dimensions will be used: For reference blocks installed at the ends of flat insulating boards and at the intersections of four insulating boards, a square reference block with dimensions L1×L1 (L1 ranges from 190 to 200) mm will be used. For reference blocks installed in the middle of flat insulating boards, corner insulating boards, and boundary insulating boards, a rectangular reference block with dimensions L1×L2 (L2 ranges from 95 to 100) mm will be used. Figure 4 This indicates the arrangement of the reference pads in the planar insulation plate area.

[0047] To increase the overall strength of the reference pad, a reinforcing rib can be added to the side of the reference pad facing the hull (i.e., the back). This reinforcing rib should be 2mm high and 1mm thick to ensure the overall thickness of the reference pad is 4mm without affecting the installation of the insulation plate. For square reference pads, the reinforcing ribs are placed at L1 / 2 and L1 / 4, respectively; for rectangular reference pads, the reinforcing ribs are placed at L1 / 2 and L2 / 2, respectively. See [link to relevant documentation]. Figure 5 as well as Figure 6 .

[0048] Before the installation of the reference pad, the hull of the ship has been integrally formed, and the cargo containment system markings have been completed. At this point, a laser level and photoelectric receiver are used to measure and record the relative height between the reference pad measurement points and the reference surface. Then, GTT calculation software is used to generate a thickness distribution map of the reference pad. Depending on the installation height of the reference pad, the installation method mainly falls into three categories:

[0049] Method 1: The reference pad is in direct contact with the inner shell 3 of the ship. In this case, the reference pad actually supports the insulating plate 1, such as... Figure 5 As shown. Tighten the thin nut 7 onto the welding stud 8 and spot weld it to fix the reference pad. Then place the insulating plate 1 to be installed in the designated position, and install the washers and hexagonal nuts 9 respectively to achieve the positioning and installation of the insulating plate 1. Figure 7 .

[0050] Method 2: The thickness between the reference shim and the hull is less than that of the thin nut 7. During installation, the reference shim only needs to be raised to the required height. At this time, a shim 10 of appropriate thickness is installed under the reference shim and spot-welded to fix it, so that the reference shim is fixed at the appropriate height. Figure 6 As shown. Then, as in the first case, place the insulating board 1 to be installed in the designated position, and then install the washer 8 and the hexagonal nut 9 respectively to achieve the positioning and installation of the insulating board 1, as shown. Figure 8 .

[0051] Method 3: The gap between the reference shim and the inner shell 3 is greater than the thickness of the thin nut 7. In this case, one thin nut 7 needs to be screwed onto the welding stud 8 under the reference shim first, and the installation height of the thin nut 7 below should be determined according to the thickness distribution diagram of the reference shim, and then spot welded for fixation. After all the thin nuts 7 (2 or 4) under the reference shim have been adjusted and installed, the reference shim is placed on these thin nuts 7, thereby achieving the effect of overall leveling of the reference shim. Figure 7 As shown. Next, as in the first case, screw in the thin nut 7 at the top of the reference pad to fix its position. Then place the insulating plate 1 and install the washer 8 and hexagonal nut 9 to complete the installation of the insulating plate 1. Figure 9 .

Claims

1. A method for installing a reference pad in a membrane-type enclosure system, characterized in that, The reference pad includes a square reference pad and a rectangular reference pad. The square reference pad has a square reference plate. The front of the square reference plate has four downwardly recessed circular grooves. A through hole is opened in the center of the circular groove. The circular grooves form a protrusion on the back of the square reference plate. The back of the square reference plate is provided with transverse reinforcing ribs and longitudinal reinforcing ribs. The rectangular reference pad has a rectangular reference plate. The front of the rectangular reference plate has two downwardly recessed circular grooves. The back of the rectangular reference plate has transverse and longitudinal reinforcing ribs. The circular grooves form protrusions on the back of the rectangular reference plate. The overall thickness of the reference pad is 4mm, the thickness of the square reference plate and the rectangular reference plate is 2mm, and the depth of the circular groove is 2mm. Square reference blocks are used at the intersection of the four insulating boards, and rectangular reference blocks are used at the ends and middle of the insulating boards. The installation of the reference pad is as follows: When the distance between the reference pad and the inner shell of the ship is equal to the thickness of the thin nut, the thin nut is located in the circular groove. Place the reference pad between the inner shell of the ship and the insulating plate. The welding stud passes through the through hole in the center of the circular groove from the back of the reference pad. Tighten the thin nut on the welding stud and spot weld it. Then place the insulating plate to be installed in the designated position. Install the washer and hexagonal nut on the welding stud in sequence. When the distance between the reference pad and the inner shell of the ship is less than the thickness of the thin nut, lift the reference pad upward, install the washer under the reference pad, and spot weld it to fix it so that the distance between the reference pad and the inner shell of the ship is equal to the thickness of the thin nut. The welding stud passes through the through hole in the center of the circular groove from the back of the reference pad, tightens the thin nut on the welding stud and spot welds it, and then places the insulation plate to be installed in the designated position. The washer and hexagonal nut are installed on the welding stud in sequence. When the distance between the reference pad and the hull is greater than the thickness of the thin nut, first screw a thin nut onto the welding stud under the reference pad, and determine the installation height of the thin nut below according to the thickness distribution diagram of the reference pad, and then spot weld it in place. After all the thin nuts under the reference pad have been adjusted and installed, place the reference pad on these thin nuts so that the distance between the reference pad and the hull is equal to the thickness of the thin nut. The welding stud passes through the through hole in the center of the circular groove from the back of the reference pad, and the thin nut is tightened on the welding stud and spot welded. Then place the insulation plate to be installed in the designated position, and install the washer and hexagonal nut on the welding stud in sequence.

2. The method for installing the reference pad of a membrane-type enclosure system according to claim 1, characterized in that, The square reference plate is divided into four square regions of the same size, and four circular grooves are located at the center of the four regions respectively.

3. The method for installing the reference pad of a membrane-type enclosure system according to claim 1, characterized in that, The height of the reinforcing rib is 2mm.

4. The method for installing a reference pad in a membrane-type enclosure system according to claim 1, characterized in that, The thickness of a thin nut should not exceed the depth of the circular groove.

5. The method for installing a reference pad in a membrane-type enclosure system according to claim 1, characterized in that, The side length of the square reference pad is 190mm to 200mm.

6. The method for installing a reference pad in a membrane-type enclosure system according to claim 1, characterized in that, The rectangular reference pad has a length of 190mm to 200mm and a width of 95mm to 100mm.

7. The method for installing a reference pad in a membrane-type enclosure system according to claim 1, characterized in that, The reinforcing ribs of the square reference plate are set at 1 / 2 and 1 / 4 of the side length, respectively.

8. The method for installing a reference pad in a membrane-type enclosure system according to claim 1, characterized in that, The reinforcing ribs of the rectangular reference plate are set at 1 / 2 of the length and 1 / 2 of the width.

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