JPS62778B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is mainly concerned with a membrane tank or a semi-breeding tank for storing or transporting ultra-low temperature liquefied gas such as liquefied natural gas or liquefied petroleum gas. Regarding the pressure-resistant board used.

Boards used for the above-mentioned purposes not only have inherent heat insulation properties, but also have high resistance to internal pressure acting on the side walls and bottom walls of the tank, as well as large loads acting on the side walls due to tank oscillations and other causes. In order to prevent it from being destroyed or deformed due to stress, it is required to have much higher pressure resistance than general insulation boards, and it is also required to be lightweight in terms of handling and construction.

One way to meet such demands is to increase the compressive ^strength of the insulation material itself, that is, to use high-density insulation materials. High densities may be required. As a result, the weight of the product increases, which not only adversely affects handling and construction, but also reduces the heat insulation properties, which is the primary requirement for this type of board. That is, the insulation properties of foamed resin insulation materials such as polyurethane foam deteriorate as the density increases.

In addition, as a heat insulating board that does not reduce insulation properties, is lightweight and has sufficiently high pressure resistance,
It was originally developed as a heat insulating material for the propellant fuel (liquid hydrogen) tanks of space rockets, and was created by foaming foam insulating material in a formwork in which a special three-dimensional glass fiber lattice was placed in advance. A product containing glass fiber or a product made by polymerizing and adhering a glass fiber sheet and a heat insulating material in multiple layers, as shown in Japanese Patent Application Laid-Open No. 52-26648, is cut perpendicular to the laminated surface, and then A composite insulation material is known in which the cut layers and glass fiber sheets are alternately polymerized and bonded together again, but the former requires a large amount of special materials and a very advanced foaming technology. In addition, in the latter case, it is difficult to mass-produce homogeneous boards because it requires a complicated manufacturing process, and it is difficult to control the quality of the bonding and cutting processes in particular. The problem was that it became expensive.

Furthermore, as another means to meet the above-mentioned requirements, two surface materials such as plywood that are bonded and integrated on both the front and back sides of the board in order to protect the surface of the board and secure it to a tank, etc., are available. In between, a plurality of columnar members are fixedly interposed at appropriate intervals, a resin heat insulating material is foamed in the space formed by these, and the columnar members are made to bear the required compressive strength. However, the conventional board of this type is, for example, published in Japanese Patent Application Laid-Open No. 1973-
As shown in Publication No. 105227, since the columnar members were made of wood, which is a natural material, the compressive strength of the columnar members alone was small. It becomes necessary to increase the arrangement density or increase the diameter of each columnar member, which causes a decrease in insulation performance, and also causes an increase in the total weight of the board. Since it is made of wood, it requires a manufacturing process that involves cutting raw materials and cutting, making it difficult to obtain a homogeneous product.Also, because it is hygroscopic, cracks may occur due to corrosion or volumetric expansion due to freezing of contained moisture. The material quality and strength deteriorate over time due to
There was a problem that this shortened the durability (lifespan) of the board.

In addition, as shown in Japanese Utility Model Publication No. 52-39108, there is a technique in which the columnar members are made of a synthetic resin material instead of a wooden product, thereby significantly improving the compressive strength compared to wooden ones. Traditionally known. However, even if the columnar member is made of synthetic resin material, if the thickness of the insulation material is increased to improve the insulation performance, if the columnar member is too thin, it will easily buckle and deform. Alternatively, there is a drawback that the strength against the shearing force acting in the direction along the board surface becomes low. The disadvantage is that the insulation performance decreases as the diameter increases.
After all, when obtaining a thick insulation material to improve insulation performance, it is unavoidable that the compressive strength and shear strength will decrease, and the insulation performance will decrease due to the increase in the diameter of the columnar members. It was considered a thing.

The present invention aims to obtain a highly foamed heat insulating material that is lightweight and has an excellent heat insulating function by increasing the thickness and further improving the heat insulating performance. The objective is to obtain a pressure-resistant heat insulating board equipped with a thick heat insulating material without causing a decrease in pressure strength or shear strength due to buckling deformation of columnar members.

The characteristic structure of the present invention for achieving the above object is that a plurality of reinforcing columnar members made of resin are installed in a foamed resin heat insulating material at appropriate intervals and penetrating or almost penetrating in the thickness direction of the foamed resin heat insulating material. At the same time, the reinforcing columnar members are embedded in an inclined position with respect to the thickness direction of the heat insulating material, and further, the reinforcing columnar members are penetrated and supported within the thickness of the heat insulating material. In this state, one or more plate-like bodies are interposed in the state in which the device is in use, and this configuration provides the following effects.

Since the synthetic resin columnar members, which have extremely high pressure resistance compared to wooden ones, can bear most of the pressure resistance required for the board, the insulation material itself should be made of materials with low pressure resistance, that is, low density and high Since foam can be used, the entire board can be made lighter despite its thickness. In addition, since the heat insulating material can be of low density, its own thermal conductivity can also be reduced. In addition, it is possible to further increase the compressive strength of the reinforcing column member by blocking buckling deformation of the reinforcing column member, which originally has high compressive strength, with the intermediate plate-like member. This combination of embedding in an inclined position in the thickness direction increases both pressure resistance and shear resistance, resulting in a thick wall that is lightweight, has excellent heat insulation performance, and has excellent pressure resistance and shear resistance. We were able to obtain this insulation board.

Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows the most basic structure, in which polyester, epoxy, etc. A plurality of solid or hollow reinforcing columnar members 3 made of glass fiber or carbon fiber reinforced resin are penetrated in the thickness direction of the heat insulating material 4, and
The insulation material 4 is embedded in an inclined position with respect to the thickness direction, and plywood, aluminum plate,
This is a board in which a plate-like body 5 having low-temperature durability and low-temperature strength, such as a stainless steel plate, is interposed so as to penetrate and support the three groups of reinforcing columnar members, and the manufacturing method thereof is as follows: A plurality of holes are formed in the heat insulating material 4 and the plate-shaped body 5 which are formed by foam molding on the front and back sides of the 5, and penetrate in the thickness direction thereof at required intervals, and the columnar members 3, which are separately molded in advance, are inserted into the holes. Insertion method: ○B Inject uncured liquid resin (this also includes those mixed with glass fiber or carbon fiber) into the holes formed in the heat insulating material 4 and the plate-shaped body 5 in the same manner as above and polymerize it. how to harden,
○ Assemble the formwork and the plate-like body 5, and fix the columnar members 3 in parallel to the formwork by passing them through the holes drilled in the plate-like body 5 in advance, and fill the space with polyurethane stock solution or polystyrene resin. A method of integrating the columnar member 3, the heat insulating material 4, and the plate-like member 5 by introducing granular materials and filling the space by a foaming reaction. etc. are possible.

In any of the above methods, a board with a considerably large thickness, that is, a board that is an integer multiple of the thickness of the required insulation board, is manufactured at one time, and then this is cut into slices to the required thickness. can also be adopted.

The diameter (thickness) and arrangement pitch of the reinforcing columnar member 3 are appropriately designed depending on the compressive strength value of its constituent material. In particular, when using fiber reinforced resin, the diameter The desired purpose can be achieved by using a small number of small fibers, and furthermore, if long fibers are used as reinforcing fibers and are oriented along the longitudinal direction of the columnar member, compression can be achieved. The strength can be maximized, which is more advantageous in terms of board pressure resistance.

Although the above-mentioned pressure-resistant insulation board is sometimes used as a single unit, it is usually used as insulation material 4.
As shown in Figures 2 and 3, in order to protect the surface of
Insulation material 4. Plywood on both sides in the wall thickness direction, or on one side.
Surface material 1 such as plywood resin plate or aluminum plate,
They are selected as appropriate depending on the conditions of use and integrally joined to be used in a so-called panel form.

In the above-mentioned panel form, when joining the ends of the reinforcing columnar members 3 to the surface material 1, simple contact and fixation may be used, but in order to increase the bonding area of the ends of the reinforcing columnar members 3. Then, apply adhesive in a V-shape around the end of the columnar member 3,
By taking measures such that the joint area is larger than the cross-sectional area at the middle part of the columnar member 3,
For example, when the reinforcing columnar member 3 is strongly tightened and fixed to a building frame, the strong axial force that acts on the reinforcing columnar member 3 is dispersed over a wide adhesive area, and the surface material 1 has a lower compressive strength than the reinforcing columnar member 3. It may be configured to avoid local damage or deformation.

[Brief explanation of the drawing]

The drawings show an embodiment of the pressure-resistant insulation board according to the present invention, and FIG. 1 is a partially cutaway perspective view, and FIG. 2 is a partially cutaway perspective view.
The sectional view taken along the line ``--'' and FIGS. 3 and 4 are enlarged longitudinal sectional views of main parts showing different embodiments, respectively. 3...Reinforcing columnar member, 4...Insulating material, 5...Plate-shaped body.

Claims (1)

[Scope of Claims] 1. A plurality of reinforcing columnar members 3 made of resin are embedded in the foamed resin heat insulating material 4 at appropriate intervals and penetrating or almost penetrating in the thickness direction thereof, and The reinforcing columnar member 3 is embedded in an inclined position with respect to the thickness direction of the heat insulating material 4, and the group of reinforcing columnar members 3 is penetrated and supported within the thickness of the heat insulating material 4. A pressure-resistant insulation board characterized by having one or more plate-like bodies 5 interposed therebetween. 2. The pressure-resistant insulation board according to claim 1, wherein the reinforcing columnar member 3 is made of glass fiber or carbon fiber reinforced resin. 3. A patent claim in which the fibers mixed in the resin constituting the reinforcing columnar member 3 are long fibers, and the long fibers are mixed in an orientation along or almost along the longitudinal direction of the columnar member 3. The pressure-resistant insulation board according to item 2 of the range. 4. The pressure-resistant heat insulating board according to any one of claims 1 to 3, wherein the plate-like body 5 is interposed at the center or substantially the center of the thickness of the heat insulating material 4.