A novel adhesion method for the top bridge plate of a new type of thin-film enclosure system

Abstract

A novel method for bonding the top bridge plate of a thin-film type enclosing system. The bottom surface is an arc surface that bulges outwards from the center and is bonded to the rigid secondary screen wall. The coating method of the top bridge plate adhesive is divided into the middle area and the boundary area according to the characteristics of the bonding station. The middle area is fully paved, and the boundary area is paved in strips. The coating direction of the strip-shaped top bridge plate adhesive is parallel to the short side of the top bridge plate. During installation, the adhesive of the top bridge plate in the middle area is squeezed from the arc top to both sides. The adhesive preferentially fills the voids caused by the secondary layer insulation gap between the flexible secondary screen wall and the top bridge plate, ensuring the bonding effect in the middle key area. At the same time, the paving machine rolls the top bridge plate along the direction of the adhesive strip, which can quickly install the top bridge plate within the specified layer difference range. At the same time, the adhesive is evenly laid, and the air bubbles are quickly discharged, improving the bonding speed and bonding quality. It no longer relies on the random control of the glue head, accurately grasps the amount of adhesive in each area, and does not require the operator to repeatedly debug, saving material and labor costs.

Description

Technical Field

[0001] The present invention belongs to the field of design and construction of thin-film type enclosure systems, and particularly relates to a method for adhering a top bridge plate of a new thin-film type enclosure system. Background Art

[0002] The thin-film type cargo containment systems developed by the French company GTT include the NO96 type and the MarkⅢ type. For the MarkⅢ type cargo containment system, enhanced polyurethane foam and other insulating materials are used as the heat-insulating materials for the liquid cargo to ensure that the natural gas in the liquid cargo tank is maintained in a liquid state below -163°C, thereby preventing the low-temperature embrittlement caused by the direct contact between the liquefied natural gas and the hull.

[0003] The top bridge pad is a part of the main layer insulation module. As shown in Figure 1 , the flexible secondary barrier is adhered to the secondary layer insulation between adjacent insulation boards through a flexible secondary barrier adhesive and covers the gap formed by the adjacent insulation boards. The top bridge pad is adhered to the flexible secondary barrier between the flat insulation boards and the corner area insulation boards through a top bridge pad adhesive, thereby realizing the integrity of the main layer insulation and providing an installation plane for the main barrier. Under the flexible secondary barrier covered by the top bridge pad, there is a gap between the two insulation boards, and the gap is filled with glass wool components. In the boundary area of the flat insulation board, caulking foam components are additionally filled. However, there is often a layer difference between the filled glass wool components, caulking foam components and the flexible secondary barrier, and the hardness of the glass wool components also differs from that of the insulation boards. Therefore, there is a gap between the flexible secondary barrier between the secondary layer insulation boards and the bottom of the top bridge pad.

[0004] To ensure that the top bridge pad adhesive on the top bridge pad can completely fill this gap, currently, the coating methods of the top bridge pad adhesive are usually the 3-strip type and the 1-strip type. The number of coating strips is achieved by changing the number of outlets of the linear nozzle of the adhesive dispenser. The linear nozzle is connected to the supply pipeline, and the linear nozzle is symmetric about the supply pipeline left and right. For both coating methods, the thickness of the adhesive in the middle is greater than that on both sides.

[0005] However, the control of the thickness of the adhesive in different areas is only determined by the position of the nozzle outlet. Since the middle outlet is close to the feed pipe, the glue outlet speed is greater than that on both sides, and the glue thickness in each area cannot be accurately controlled. There is often a lack of glue in the gap between the secondary layer insulation layers during adhesion. To meet the adhesion effect, it is necessary to increase the minimum glue supply amount of the dispenser or pre-coat the top bridge pad adhesive at the gap in the area to be adhered in advance. In addition, when adhering the top bridge pad directly to the area to be installed, the air bubbles under the top bridge pad are not easily discharged, and there is often a situation of drum hollowing, which affects the adhesiveness of the top bridge pad and the safety and heat insulation effect of the cargo containment system during operation. Summary of the Invention

[0006] To solve the above problems, the present invention provides a novel method for adhering the top bridge plate of a thin-film type enclosure system, aiming to improve the adhesion quality of the top bridge plate of the thin-film type enclosure system while shortening the construction period of the top bridge plate. The technical solution adopted is as follows:

[0007] A novel method for adhering the top bridge plate of a thin-film type enclosure system, characterized in that the top bridge plate of the thin-film type enclosure system is a cuboid formed by sequentially adhering plywood, enhanced polyurethane foam and a rigid secondary screen wall. The upper surface of the enhanced polyurethane foam is a plane and is adhered to the plywood, and the bottom surface is an arc surface convex outward from the center and is adhered to the rigid secondary screen wall.

[0008] The arc surface of the top bridge plate satisfies the ellipse formula:

[0009]

[0010] where W is the width of the top bridge plate.

[0011] The width W and length of the top bridge plate are adapted to the gap between the main insulation modules of the two insulation plates.

[0012] After applying the top bridge plate adhesive and completing the installation of the top bridge plate, the layer difference between the top of the top bridge plate and the adjacent main layer of the insulation plate should be controlled between -0.5 mm and +0.5 mm, and the thickness of the top bridge plate adhesive should not be less than the minimum application thickness T 4min , where the recommended adhesion thickness of the T3 flexible secondary screen wall adhesive is the minimum adhesion thickness T 3min = 0.2 mm to the maximum adhesion thickness T 3max = 1.2 mm, and the recommended thickness value of the T4 top bridge plate adhesive is the minimum application thickness T 4min = 0.5 mm to the maximum application thickness T 4max = 4 mm, and the maximum height value of the top bridge plate is

[0013] H1 = H + 0.5 - 2×T2 - 2×T 3max -T 4min ;

[0014] where

[0015] T2 is the thickness of the flexible secondary screen wall.

[0016] T3 is the thickness of the flexible secondary screen wall adhesive.

[0017] T4 is the thickness of the top bridge plate adhesive.

[0018] H is the height of the main insulation layer of the flat insulation plate.

[0019] H1 is the maximum height of the top bridge plate.

[0020] When applying the top bridge plate adhesive, it is divided into a middle area and a boundary area. In the middle area, the top bridge plate adhesive is fully spread, and in the boundary area, the top bridge plate adhesive consists of multiple parallel rows of top bridge plate adhesive strips. The direction of the strips is parallel to the short side of the top bridge plate.

[0021] The width W1 of the top bridge plate adhesive in the middle area = T1 + 2X1, where T1 is the gap value of the secondary insulating board, and X1 = 25 mm to 27 mm. X1 is the coating width of the top bridge plate adhesive that extends beyond the secondary insulating gap on one side.

[0022] The width W2 of the top bridge plate adhesive strip in the boundary area = X6 + 2X2 - W1 - 2X5, where X2 = 10 mm to 15 mm; the maximum distance X5 between any two top bridge plate adhesives ≤ 10 mm, X6 is the width of the flexible secondary screen wall, and X2 is the coating width of the top bridge plate adhesive that extends beyond the width of the flexible secondary screen wall on one side.

[0023] To facilitate ensuring the minimum thickness requirement of the top bridge plate adhesive in the middle area of the top bridge plate, multiple cuboid pads made of EPE need to be installed in the gaps between the two sides of the coating area of the top bridge plate adhesive in the middle area and the boundary coating area. In addition, to ensure the flatness of the installation plane of the top bridge plate, multiple relatively higher EPE pads are also installed outside the top bridge plate adhesive in the boundary area. The adhesive surface of the EPE pads has double-sided tape, and the adhesion area cannot be installed in the gap between the two planar insulating boards.

[0024] After the top bridge plate adhesive is applied, immediately move the top bridge plate to the designated station. After checking the installation direction, place the top bridge plate into the gap of the main insulating layer of the planar insulating board. Insert wedges around the top bridge plate to align the edge of the top bridge plate with the main insulating layer of the adjacent planar insulating board and keep it centered. Subsequently, use a handheld flattening machine to roll the top bridge plate on the top bridge plate to adjust the height of the top bridge plate. The rolling direction is from the center line in the width direction of the top bridge plate to both sides. The top bridge plate adhesive in the middle area is also squeezed to both sides, preferentially filling the secondary insulating gap. The top bridge plate adhesive strips in the boundary area are gradually pressed down until they intersect under rolling, and then the gap between the top bridge plate and the flexible secondary screen wall is filled.

[0025] When the top surface of the top bridge plate is flush with the top surface of the main insulating layer of the adjacent planar insulating board, place a pressure bar at the top of the top bridge plate and fix both ends of the pressure bar in the bolt holes of the main insulating layer of the adjacent planar insulating board through bolts. Check the layer difference between the top bridge plate and the main insulating layer of the adjacent planar insulating board again. If the requirement is not met, use the flattening machine to roll again until the layer difference requirement is met, and tighten the bolts on the pressure bar again. At the same time, the entire installation process needs to be completed within the maximum open time of the top bridge plate adhesive.

[0026] After the top bridge plate adhesive is completely cured, remove the pressure bar and wedges to complete the installation of the top bridge plate.

[0027] The above-mentioned method for adhering the top bridge plate of a new thin-film type enclosure system. Further, the adhesion thickness of the flexible secondary screen wall adhesive is 0.2 mm to 1.2 mm, and the thickness value of the top bridge plate adhesive is 0.5 mm to 4 mm.

[0028] The above-mentioned method for adhering the top bridge plate of a new thin-film type enclosure system. Further, the coating thickness of the adhesive in the middle area is 3.3 mm to 3.6 mm, and the coating thickness of the top bridge plate adhesive in the boundary area is 6 mm to 8 mm.

[0029] The adhesion surface of the top bridge plate of the present invention is a prefabricated combined cuboid of enhanced polyurethane foam, plywood, and rigid secondary screen wall with arc-shaped protrusions. The coating method of the top bridge plate adhesive is divided into the middle area and the boundary area according to the characteristics of the adhesion station. The middle part is fully paved, and the boundary area is paved in strips. The coating direction of the strip-shaped top bridge plate adhesive is parallel to the short side of the top bridge plate. Due to the arc-shaped protrusions on the adhesion surface of the top bridge plate and the geometric shape with the middle high and both sides low, when installing, the top bridge plate adhesive in the middle area is extruded from the arc-shaped top to both sides. The adhesive preferentially fills the voids caused by the secondary layer insulation gap between the flexible secondary screen wall and the top bridge plate, ensuring the adhesion effect in the key middle area. Secondly, because the boundary area is an adhesive strip parallel to the short side of the top bridge plate, the length of the resin strip is short and there are many voids. The gas existing between the adhesives during the laying process of the top bridge plate has a short discharge distance and is easily discharged during the extrusion process. At the same time, with the use of a paving machine, the paving machine rolls the top bridge plate along the direction of the adhesive strip, which can quickly install the top bridge plate within the specified layer difference range. At the same time, the adhesive is evenly laid, and the bubbles are quickly discharged, improving the adhesion speed and adhesion quality. The amount of glue applied is accurately controlled in zones during the coating process, no longer relying on random control by the glue head, accurately grasping the amount of adhesive used in each zone, without the need for operators to repeatedly debug, saving material and labor costs. Cuboid pads made of multiple pieces of EPE are adhesively connected on both sides of the adhesive in the middle area, which can ensure the minimum adhesion height of the top bridge plate adhesive in the middle area during the rolling process of the top bridge plate and ensure the effectiveness of adhesion. Description of the Drawings

[0030] Figure 1 is the interface view of the existing top bridge plate adhesion station;

[0031] Figure 2 is the three-dimensional view of the back and front of the top bridge plate of the present invention;

[0032] Figure 3 is the schematic diagram of the adhesion station at the intersection area of four plane insulation boards of the present invention;

[0033] Figure 4 is the cross-sectional view of the top bridge plate adhesion station of the present invention;

[0034] Figure 5 is Figure 4 the enlarged view at B in

[0035] Figure 6 is a schematic diagram of the adhesive coating method for the top bridge plate of the present invention;

[0036] Figure 7 is a cross-sectional view of the adhesive coating of the top bridge plate of the present invention;

[0037] Figure 8 is a three-dimensional view of the installation process of the top bridge plate in the elevation station of the present invention;

[0038] Figure 9 is a schematic diagram of the installation of the pressure bar in the elevation station of the top bridge plate of the present invention;

[0039] Among them, 1 - top bridge plate adhesive, 2 - planar insulating board, 3 - glass wool component, 5 - flexible secondary screen wall, 8 - rigid secondary screen wall, 9 - enhanced polyurethane foam, 10 - plywood, 11 - EPE cushion block, 12 - top bridge plate adhesive in the middle area, 13 - top bridge plate adhesive in the boundary area, 15 - main insulation layer of the planar insulating board, 16 - wedge block, 17 - top bridge plate, 18 - pressure bar. Specific Embodiments

[0040] The following details the specific embodiments of the present invention in conjunction with preferred embodiments.

[0041] A method for adhering the top bridge plate of a new type of thin-film enclosure system, as Figure 2 shown, the top bridge plate 17 of the new type of thin-film enclosure system is a cuboid formed by adhering plywood 10, enhanced polyurethane foam 9 and a rigid secondary screen wall 8. The top surface of the enhanced polyurethane foam is flat and adhered to the plywood, and the bottom surface is an arc surface adhered to the rigid secondary screen wall. The middle thickness in the width direction of the top bridge plate is greater than that of both sides, so as to ensure that the top bridge plate adhesive 1 is extruded outward with the center line of the width direction of the top bridge plate as the reference, thereby ensuring that the gap between the flexible secondary screen wall 5 between the secondary insulating boards and the bottom of the top bridge plate is filled with the top bridge plate adhesive 1.

[0042] The arc surface of the top bridge plate satisfies the ellipse formula:

[0043]

[0044] where W is the width of the top bridge plate;

[0045] The width W and length of the top bridge plate are adapted to the gap between the main insulation modules of the two insulating boards and are easy to install. As Figure 3As shown, to ensure that when the top bridge plate is installed at the intersection of 4 flat insulating plates 2, and two cross - intersecting flexible secondary screen walls 5 are adhered with the maximum dose of flexible secondary screen wall adhesive under the top bridge plate station, after applying the top bridge plate adhesive 1 on the top bridge plate and completing the installation, the layer difference between the top of the top bridge plate and the main layer of the adjacent insulating plate should be controlled between - 0.5mm and + 0.5mm, and the thickness of the top bridge plate adhesive should not be less than the minimum coating thickness T 4min . Among them, the recommended adhesion thickness of the T3 flexible secondary screen wall adhesive is T 3min = 0.2mm to the maximum adhesion thickness T 3max = 1.2mm, and the recommended thickness value of the T4 top bridge plate adhesive is the minimum coating thickness T 4min = 0.5mm to the maximum coating thickness T 4max = 4mm. Therefore, the maximum height value of the top bridge plate is

[0046] H1 = H + 0.5 - 2×T2 - 2×T 3max - T 4min ;

[0047] Among them,

[0048] T2 is the thickness of the flexible secondary screen wall.

[0049] T3 is the thickness of the flexible secondary screen wall adhesive.

[0050] T4 is the thickness of the top bridge plate adhesive.

[0051] H is the height of the main insulating layer of the flat insulating plate.

[0052] H1 is the maximum height of the top bridge plate.

[0053] To ensure that the adhesion area between the flexible secondary screen wall 5 and the top bridge plate can be completely covered by the top bridge plate adhesive 1, and the air bubbles generated during adhesion of the top bridge plate adhesive can be quickly discharged, when applying the top bridge plate adhesive, it is divided into an intermediate area and a boundary area, as Figure 6 shown. The adhesive in the intermediate area is fully paved, and the top bridge plate adhesive in the boundary area is a parallel multi - column top bridge plate adhesive strip, and the direction of the strip is parallel to the short side of the top bridge plate. As Figure 7 shown, the width W1 of the top bridge plate adhesive in the intermediate area = T1 + 2X1, T1 is the clearance value of the secondary insulating plate, X1 = 25mm to 27mm, and X1 is the coating width of the top bridge plate adhesive that extends beyond the secondary insulating clearance on one side.

[0054] The width W2 of the top bridge plate adhesive strip in the boundary area = X6 + 2X2 - W1 - 2X5, X2 = 10mm to 15mm; the maximum distance X5 between any two top bridge plate adhesives ≤ 10mm, X6 is the width of the flexible secondary screen wall, and X2 is the coating width of the top bridge plate adhesive that extends beyond the width of the flexible secondary screen wall on one side.

[0055] The adhesive coating thickness in the middle area is controlled between 3.3 mm and 3.6 mm, and the adhesive coating thickness of the top bridge plate in the boundary area is controlled between 6 mm and 8 mm.

[0056] To facilitate ensuring the minimum thickness requirement of the adhesive of the top bridge plate in the middle area of the top bridge plate, a plurality of cuboid pads made of EPE need to be installed at the gaps between the two sides of the adhesive coating area of the top bridge plate in the middle area and the boundary coating area. In addition, to ensure the flatness of the installation plane of the top bridge plate, a plurality of EPE pads 11 that are relatively higher than the middle area are also installed outside the adhesive of the top bridge plate in the boundary area. The adhesive surface of the EPE pad 11 is provided with double-sided tape, and the adhesive area cannot be installed at the gap between the two planar insulating plates 2.

[0057] After the adhesive of the top bridge plate is coated, the top bridge plate is immediately moved to the gap of the main insulating layer of the planar insulating plate between the two insulating plates. After checking the installation direction, the top bridge plate is placed into the gap of the main insulating layer 15 of the planar insulating plate. Wedges 16 are inserted around the top bridge plate to align the edge of the top bridge plate with the adjacent main insulating layer and make the position centered, as Figure 8 shown. Subsequently, a handheld levelling machine is used to roll the top bridge plate on the top bridge plate to adjust the height of the top bridge plate. The rolling direction is from the center line in the width direction of the top bridge plate to both sides, and the direction is as Figure 8 shown by the arrow in the figure. The adhesive 12 of the top bridge plate in the middle area is also squeezed to both sides, preferentially filling the secondary layer insulating gap. The adhesive strip of the top bridge plate in the boundary area is gradually pressed down to intersect under the rolling, and then the gap between the top bridge plate and the flexible secondary screen wall 5 is filled. Because the levelling machine has a vibration function, the vibration can accelerate the flow rate of the adhesive of the top bridge plate, make the coating more uniform and make the bubbles inside it quickly discharge along the width direction of the top bridge plate. When the top surface of the top bridge plate is flush with the top surface of the adjacent main insulating layer of the planar insulating plate, a pressure bar is placed at the top of the top bridge plate, and both ends of the pressure bar are fixed in the bolt holes of the adjacent main insulating layer of the planar insulating plate through bolts, as Figure 9 shown. Check the layer difference between the top bridge plate and the adjacent main insulating layer of the planar insulating plate again. If the requirement is not met, use the levelling machine to roll again until the layer difference requirement is met, and tighten the bolts on the pressure bar 18 again. At the same time, the entire installation process needs to be completed within the maximum open time of the adhesive of the top bridge plate 1. After the adhesive of the top bridge plate is completely cured, the pressure bar 18 and the wedges 16 are removed to complete the installation of the top bridge plate.

Claims

1. A method for bonding the top bridge plate of a membrane type enclosure system, characterized in that: The top bridge plate (17) of the membrane type enclosure system is a rectangular parallelepiped formed by sequentially bonding a plywood (10), a reinforced polyurethane foam (9) and a rigid secondary screen wall (8); the upper surface of the reinforced polyurethane foam (9) is a plane and is bonded to the plywood (10); the bottom surface is a curved surface convex outward from the center and is bonded to the rigid secondary screen wall (8); The arc surface of the top bridge plate (17) satisfies the ellipse formula: ； Wherein, W is the width of the top bridge plate (17); The width W and length of the top bridge plate (17) are adapted to the gap between the insulation modules of the main layers of the two insulation plates; After the top bridge board (17) is coated with the top bridge board adhesive (1) and installed, the height difference between the top of the top bridge board (17) and the main layer of the adjacent insulation board should be controlled between -0.5mm and +0.5mm, and the thickness of the top bridge board adhesive (1) should not be less than the minimum coating thickness T 4min The maximum height of the top bridge plate (17) is, H1=H+0.5-2×T2-2×T 3max -T 4min ; in, T2 is the thickness of the flexible secondary screen (5); T3 is the thickness of the flexible secondary screen adhesive; T4 is the thickness of the top bridge plate adhesive (1); H is the height of the main insulating layer (15) of the flat insulating board; H1 is the maximum height of the top bridge plate (17); When the top bridge plate adhesive (1) is applied, it is divided into a middle area and a boundary area. The top bridge plate adhesive (12) in the middle area is fully spread, and the top bridge plate adhesive (13) in the boundary area is a plurality of parallel rows of top bridge plate adhesive strips, and the direction of the strips is parallel to the width of the top bridge plate (17); The width of the top bridge board adhesive (12) in the middle area is W1=T1+2X1, where T1 is the gap value of the secondary insulation board, and X1=25mm to 27mm, where X1 is the coating width of the top bridge board adhesive (1) that exceeds the secondary insulation gap on one side; The width of the adhesive strip of the top bridge plate in the boundary area is W2=X6+2X2-W1-2X5, X2=10mm to 15mm; the maximum distance X5 between any two top bridge plate adhesives (1) is ≤10mm, X6 is the width of the flexible secondary screen wall (5), and X2 is the coating width of the top bridge plate adhesive (1) that exceeds the width of the flexible secondary screen wall (5) on one side; A plurality of rectangular pads made of pearl cotton are installed in the gap between the two sides of the coating area of ​​the top bridge plate adhesive (12) in the middle area and the boundary coating area, and a plurality of pearl cotton pads (11) higher than the middle area are also installed on the outside of the top bridge plate adhesive (13) in the boundary area. The bonding surface of the pearl cotton pad (11) has double-sided adhesive, and the bonding area cannot be installed in the gap between the two flat insulating plates (2); After the top bridge plate adhesive (1) is applied, the top bridge plate (17) is immediately moved to the gap between the main insulating layers (15) of the plane insulating plate between the two insulating plates. After checking the installation direction, the top bridge plate (17) is placed in the gap between the main insulating layers (15) of the plane insulating plate. Wedges (16) are inserted around the top bridge plate (17) so that the edge of the top bridge plate (17) is aligned with the main insulating layers (15) of the adjacent plane insulating plates and the position is centered. Subsequently, a handheld paving machine is used to roll the top bridge plate (17) on the top bridge plate (17) to adjust the height of the top bridge plate (17). The rolling direction is to move from the center line of the width direction of the top bridge plate (17) to both sides. The top bridge plate adhesive (12) in the middle area is also squeezed to both sides to preferentially fill the gap between the secondary insulating layers. The top bridge plate adhesive strips in the boundary area are gradually pressed down to intersect under rolling, thereby filling the gap between the top bridge plate (17) and the flexible secondary screen wall (5). When the top surface of the top bridge plate (17) is flush with the top surface of the main insulating layer (15) of the adjacent flat insulating plate, a pressure rod (18) is placed on the top of the top bridge plate (17), and the two ends of the pressure rod (18) are fixed in the bolt holes of the main insulating layer (15) of the adjacent flat insulating plate by bolts. The level difference between the top bridge plate (17) and the main insulating layer (15) of the adjacent flat insulating plate is checked again. If the requirement is not met, the leveling machine is used to roll the top bridge plate (17) again until the level difference requirement is met, and the bolts on the pressure rod (18) are tightened again. At the same time, the entire installation process must be completed within the maximum opening time of the top bridge plate adhesive (1); After the top bridge plate adhesive (1) is completely cured, the pressure rod (18) and the wedge block (16) are removed to complete the installation of the top bridge plate (17).

2. A method for bonding top bridge panels of a membrane type enclosure system according to claim 1, characterized in that: The bonding thickness of the adhesive of the flexible secondary screen wall (5) is 0.2mm to 1.2mm, and the thickness of the adhesive of the top bridge plate (1) is 0.5mm to 4mm.

3. A method for bonding top bridge panels of a membrane type enclosure system according to claim 1, characterized in that: The coating thickness of the top bridge plate adhesive (12) in the middle area is 3.3 mm to 3.6 mm, and the coating thickness of the top bridge plate adhesive (13) in the boundary area is 6 mm to 8 mm.

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