JPS644906B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the method of manufacturing hemispherical side walls of longitudinally split spherical tanks.

Conventionally, the manufacturing method for hemispherical side walls involves attaching a solidified FRP outer layer to the inner surface of a hemispherical mold, applying adhesive to the inner surface of the FRP outer layer, and forming notches at appropriate locations on the outer surface using the adhesive. The hemispherical heat insulating material is fixed by taking advantage of the expanding property of the slit part, and then an FRP inner layer is applied and the three parts are fixed together, and then the mold is released and molded.

However, although it is fixed like a sandwich by the adhesive and the FRP inner layer,
Before the FRP inner layer hardens, the heat insulator peels off or shifts due to the restoring force, and the air layer in the slits causes condensation due to the difference in temperature inside and outside the tank, causing the heat insulating material to lose its effectiveness. It also has the disadvantage of causing deterioration.

The present invention has been made in view of the above-mentioned conventional circumstances, and its purpose is to prevent peeling and misalignment due to the restoring force of the heat insulating material interposed inside in the form of a sanderch, and to form the slit reliably. It has an excellent insulation effect without deteriorating the insulation effect due to dew condensation inside, and it does not take up much space when storing or transporting the insulation material itself. It is an object of the present invention to provide a method of manufacturing a hemispherical side wall of a longitudinally split sphere tank made of a structural body.

Another objective is that when attaching and fixing heat-insulating pieces in a hemispherical shape to the FRP outer layer, an annular jig material that presses against the restoring force of the heat-insulating pieces can be attached without removing the heat-insulating pieces. It is an object of the present invention to provide a method for manufacturing a vertically split spherical tank which is effectively utilized as a part of the heat insulating layer inside the side wall of a hemisphere, and which is highly beneficial and can be expected to further simplify the manufacturing process.

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

In the figure, A is the mold, 1 is the FRP outer layer, 2 is the heat insulation layer, 3 is the FRP inner layer, 4 is the annular jig material,
The mold A is formed by first applying and forming an FRP inner layer 1 using a hand wrap method via a mold release agent applied to the inner peripheral surface.

After the FRP outer layer 1 is solidified, an annular jig material 4 made of the same material as the heat insulating piece 2a is fixed to the peripheral surface of the end portion thereof.

The annular jig material 4 has a rectangular cross section, and is cut to have the same length as the end circumferential surface of the FRP outer layer 1 coated on the mold A with a rod-shaped material having heat retention properties such as foamed urethane. form.

After fixing the annular jig material 4, a plurality of elastic heat insulating pieces 2a having the same shape are attached via an FRP intermediate layer or an adhesive 5 to cover and fix the entire inner surface of the FRP outer layer 1, that is, in a hemispherical shape. At this time, heat insulation piece 2a
Since the individual pieces are bent against the elastic force and stuck to the adhesive 5, a restoring force is naturally generated, and the restoring force is concentrated at the opening of the mold A, but there is no annular cure in that part. Since the toppings 4 are provided, there is no risk of the heat-insulating piece 2 shifting.

The heat-insulating piece 2a is made of foamed urethane or the like, which is the same material as the annular jig material 4, and is formed by adjacent meridians of the sphere, so to speak, in an expanded state when the globe is manufactured. It has a convex lens shape formed by the intersection of two circular arcs as shown in the figure, and when bonded with the adhesive 5, it is bonded and fixed in a perfect hemispherical shape, and the adjacent side edges are also securely flush with each other. There is no need to worry about contact and slits.

Incidentally, the heat retaining piece 2a formed by both arcuate wires may be further divided and two divided pieces 6 of the same shape may be used (FIG. 7) (FIG. 8).

After pasting the heat insulating piece 2a in this way, the FRP inner layer 3 is applied on the heat insulating piece 2a and the annular jig material 4, and the four parts 1,
After 2, 3, 4 solidification, the mold is released from the mold A to form a hemispherical side wall B, and this hemispherical side wall is provided as a spherical tank by fixing the flange portions 7 to each other.

As described above, the present invention provides the following features:
Since the annular jig material that maintains the curved shape of the heat insulation piece against the restoring force of the heat insulation piece is fixed, a hemispherical heat insulation layer can be formed using the flat heat insulation piece.

Therefore, it is only necessary to prepare a plurality of heat-insulating pieces of the same shape, and there is no need to integrally form a heat-insulating layer in a hemispherical shape, which simplifies the production of hemispherical side walls.
It is possible to form a hemispherical side wall made of sanderch boards that have excellent rigidity and strength without causing any gaps or shifts due to the restoring force of the heat insulating pieces without deteriorating the heat insulating effect.

In addition, when attaching and fixing a heat insulating piece to the FRP outer layer in a hemispherical shape, the annular jig material that presses against the restoring force of the heat insulating piece can be attached to the heat insulating layer inside the hemispherical side wall without removing it. It can be used as a part, and can be expected to further simplify the manufacturing process.

Thus, the intended purpose can be achieved.

[Brief explanation of drawings]

Figures 1 to 5 are process diagrams of the method for manufacturing hemispherical side walls of the present invention, Figure 1 is a vertical cross-sectional view showing the state in which the FRP outer layer is applied, and Figure 2 is a ring-shaped jig material fixed to Figure 1. 3 is a vertical sectional view showing the state in which adhesive is applied to FIG. 2, FIG. 4 is a longitudinal sectional view showing the state in which the heat insulation piece is attached to FIG.
Fig. 5 is a vertical cross-sectional view showing a state in which an FRP inner layer is applied on the heat-insulating piece shown in Fig. 4, Fig. 6 is a developed view of the heat-insulating layer, and Figs. 7 and 8 are front views of other heat-insulating pieces. FIG. 9 is a perspective view of the side wall of the hemisphere, cut away. In the figure, A: mold, 1: FRP outer layer, B:
Hemispherical side wall, 4: Annular jig material, 3: FRP inner layer,
2a: Heat retention piece, 2: Heat retention tank.

Claims (1)

[Claims] 1. A heat-insulating annular jig material is fixed to the peripheral surface of the end of the FRP outer layer formed along the inner surface of the hemispherical mold, and a flat plate-like same-shaped jig material is attached to the FRP outer layer via the annular jig material. A vertically divided piece made by adjoining a plurality of elastic heat-insulating pieces and fixing them in a hemispherical shape, applying an FRP inner layer over the heat-insulating pieces and the annular jig material, and releasing and molding after solidification. Method for manufacturing hemispherical side walls of spherical tanks.