JPS621519Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an underground storage tank for storing low-temperature liquefied gas such as LNG and LPG and petroleum.

[Prior art]

Conventionally, the construction methods for interior linings used in low-temperature underground storage tanks for liquefied gases such as LNG and LPG can be roughly divided into the following two types.

In other words, one method is to use reinforced concrete segments with heat insulating material and membranes such as SUS304 attached to the surface as formwork materials for reverse-wound concrete, and after the side wall concrete is poured, heat insulating material and membranes are installed at the joints. Composite Shell, Segment method
The other method is the insulation panel system, in which insulation materials and membranes are installed on the inner surface of the structure after the concrete structure is completed.
Panel System) method.

In any of the above methods, the cross-sectional structure is configured as shown in Figures 1 to 3, and the side wall portion A is designed to support loads such as earth pressure, water pressure, and storage tank liquid pressure, as shown in Figure 2. A concrete frame (side wall) 1 that supports the concrete frame 1, a reinforced concrete formwork segment 2 that supports the formwork of the concrete frame 1 and the cold insulation material, and a thickness of polyurethane foam that provides heat insulation and transmits hydraulic pressure to the back side. t=
Cold insulation material 3 of about 100 to 200 mm, liquid-tight and air-tight
It consists of a membrane 4 made of SUS304 or the like with a thickness of about 1 to 3 mm, and the bottom part B is made by laminating concrete 6, asphalt 7, and cold insulation material 8 on a drainage gravel layer 5 as shown in Fig. 3, and the surface is made of SUS304. Usually, a membrane 9 such as the following is attached.
In the figure, 10 is a deck hanging rod, 11 is a suspended deck, 12 is a roof, 13 is a deck cold insulator, and 14 is a water pumping pit. The above insulation panel system (Insulation Panel
Segment 2 is usually not used in the System) method. In this way, in the conventional structure, a membrane 4 made of stainless steel or the like is placed on the surface that comes into direct contact with the liquefied gas.
9 is used, and the membranes 4 and 9 ensure liquid tightness and airtightness at the same time.

[Problem that the invention attempts to solve]

As mentioned above, in conventional underground storage tanks, the membranes 4 and 9 made of stainless steel or the like, which are single members that come into direct contact with liquefied gas, are expected to have two functions, liquid-tightness and airtightness, at the same time. The connection part must be finished with high precision, the structure of that part becomes complicated and construction work is difficult, and expensive membranes 4 and 9 must be used to perform two functions at the same time. There was a problem.

This invention solves these conventional problems.

[Means for solving problems]

The underground storage tank for low-temperature liquefied gas and petroleum of this invention is an underground storage tank for low-temperature liquefied gas and petroleum in which a lining using panel-type cold insulation material is attached to the inner surface of the concrete frame. The panel is formed by pasting aluminum foil on both sides, and the lining is made of rubber asphalt that adheres the panel to the concrete surface, the panels are connected in large numbers, and are reinforced with glass fiber cloth and made of synthetic polymer as a base material. It is constructed by adhering and laminating a continuous film layer of elastomer and a continuous membrane layer of elastomer, and on the concrete frame surface of the connection part of the panel, a band-like body that integrates aluminum foil and rubber asphalt is glued and laid with the rubber asphalt. On the inner side of the storage tank, the joints are covered with a strip made of aluminum foil and unvulcanized butyl rubber, and the aluminum foil on both strips and the aluminum foil on the panel are made of polysulfide. It is characterized by being bonded with rubber.

[Effect]

In the underground storage tank for low-temperature liquefied gas and petroleum based on this invention, the panel-shaped cold insulating material performs the cold insulation function in the interior lining structure, and the polysulfide rubber that exists at the connection part of the panel-shaped cold insulating material This ensures airtightness, and the elastomer, which is a completely different material from the polysulfide rubber, ensures liquidtightness.

〔Example〕

Hereinafter, one embodiment of this invention will be explained in detail based on FIGS. 4 to 10. FIG. 4 is a cross-sectional view showing the structure of the side wall portion corresponding to FIG. 2, and includes a side wall concrete 20 and a cold insulating material 21 installed inside the side wall concrete 20 having heat insulating properties such as PVC foam, phenol foam, hard urethane foam, etc.
, rubber asphalt 22 which is interposed for adhesion between the two and adjustment of unevenness caused by the concrete surface, and an elastomer 24 reinforced with built-in glass fiber cloth 23 and made of synthetic polymer as a base material. The general part of the lining L,
The connection structure of each constituent layer related to the connection part J of the cold insulation material 21 is shown. As shown in FIG. 5, the cold insulating material 21 is formed into a regular-sized panel P by pasting aluminum foil 25a on both the front and back surfaces, and in order to prevent the formation of heat transfer bridges at the connection parts, there is a As shown in FIGS. 4 and 5, a groove 30 into which the main part 29 and the main part 29 of another panel P are fitted is machined.

FIG. 6 shows details of the portion indicated by circle C in FIG. 4. Here, 22a is rubber asphalt for bonding the general part of the panel P to the concrete 20;
b is rubber asphalt that is integrated with aluminum foil 25b and made into a tape shape of the required width, and as shown in Fig. 7, it is placed on the inner surface of concrete 20 along the vertical and horizontal connection lines according to the layout design of panel P. It is pasted on 20 concrete surfaces. 26a is polysulfide rubber applied to the surface of the aluminum foil 25b, and has good adhesion to the aluminum foil.
It also has excellent airtightness.

After the base for mounting the panels P is prepared in this manner, unevenness is adjusted using the rubber asphalt 22a and the polysulfide rubber 26a, and the panels P are successively connected and adhered. Furthermore, as shown in Fig. 8, the adhesive surface of the panel P is also coated with polysulfide rubber 26a on the peripheral part that contacts the aluminum foil 25b, and with rubber asphalt 22a on the general parts other than the above. Can be done.

Next, FIG. 9 shows the details of the inner surface of the storage tank of the panel P, which is a portion indicated by a circle D in FIG. 4. On both sides of the connection part of the panel P, polysulfide rubber 26b is applied on the aluminum foil 25a, and a tape-shaped non-vulcanized butyl rubber 27 is attached integrally with the aluminum foil 25c. Non-vulcanized butyl rubber 27
disperses movement around joints caused by low temperatures,
It absorbs and limits internal and external behavior.
In this way, as shown in FIG. 10, the inner surfaces of the connected panels P are covered vertically and horizontally at the joint. Reference numeral 28 in Fig. 8 is a hole provided in the panel P for fixing the cold insulating material to the concrete.This hole 28 is used to attach a fixing fitting such as a hole-in anchor to the concrete 20, so that it faces this hole. By embedding the head of the metal fitting, it becomes an anchor for the panel P and secures its fixation. Next, an elastomer 24 based on a synthetic polymer is continuously applied to the surface of the panel P and the upper surface of the non-vulcanized butyl rubber 27 over the entire inner surface of the storage, and a glass wire is applied over the layer formed to an appropriate thickness. A cloth 23 is laid down, and an elastomer 24 is further applied on top of the cloth 23 to form a continuous membrane layer that maintains liquid tightness and is reinforced. Thus, side wall concrete 2
The lining L of the storage tank is completed on the inner surface of 0. Incidentally, such a lining L can also be employed in the bottom panel of the storage tank instead of the configuration shown in FIG. 3.

Note that the hard polyurethane foam used as the cold insulation material contains closed gas bubbles that have a lower thermal conductivity than air, and has excellent cold insulation performance.

[Effect of idea]

As explained above, the underground storage tank for low-temperature liquefied gas and petroleum of this invention uses panel-shaped cold insulators, and airtight polysulfide rubber is laminated at the joints of the panel-shaped cold insulators. Since it has a structure in which a liquid-tight elastomer is laminated on the inner surface, the two functions of liquid-tightness and airtightness, which were traditionally performed by a single membrane such as stainless steel, can be achieved by using completely different materials such as polyester. This will be divided into sulfide rubber and elastomers. As a result, in the past, the two functions were carried out by a membrane made of a single material, resulting in a complicated structure at the connection part of the membrane, but with this invention, the two functions can be performed individually. This can be achieved with a simple laminated structure of different materials, and the cost of installing the lining can be significantly reduced. Also,
Non-vulcanized butyl rubber used for edge cutting to disperse and absorb joint displacement due to low temperatures elastically expands the fixed span of glass fiber-reinforced elastomer in response to displacement caused by contraction of the cold insulation material at the joint. This makes it possible to counteract the shrinkage of the cold insulation material.

Furthermore, polysulfide rubber is used as an adhesive for aluminum foil, and is a synthetic rubber with high oil resistance, low gas permeability, and high airtight reliability.

In addition, rubber asphalt, which is the adhesive between the cold insulation panels and the side walls, has excellent low-temperature properties, and has the advantage of being able to bond the cold insulation panels while also adjusting the unevenness of the concrete side walls.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the structure of a conventional underground storage tank, Fig. 2 is a detailed view of part A in the side wall part of Fig. 1, and Fig. 3 is a detailed view of part B in the bottom panel part of Fig. 1. Figure 4 is a sectional view of the side wall showing the structure of the underground storage tank according to this invention, Figure 5 is a perspective view of the cold insulation material according to this invention, Figure 6 is a detailed view of section C in Figure 4, and Figure 7. is an explanatory view showing the state of adhesion of rubber asphalt to side wall concrete, Fig. 8 is a perspective view showing the adhesion surface of the panel in Fig. 5, Fig. 9 is a detailed view of section D in Fig. 4, and Fig. 10. FIG. 2 is an explanatory diagram showing a joint portion on the panel surface. 20...Side wall concrete, 21...Cold insulation material,
23...Glass cloth, 24...Elastomer,
27...Non-vulcanized butyl rubber, 22, 22a, 22
b...Rubber asphalt, 25a, 25b, 25
c...Aluminum foil, 26a, 26b...Polysulfide rubber, P...Panel, J...Connection part.

Claims (1)

[Scope of utility model registration request] In an underground storage tank for low-temperature liquefied gas and petroleum, which has a lining using a panel-type cold insulating material on the inner surface of a concrete frame, the cold insulating material is formed into a panel by pasting aluminum foil on both the front and back sides. The lining is constructed by adhesively laminating a large number of the above-mentioned panels connected together with rubber asphalt that adheres the above-mentioned panels to the concrete surface, and a continuous film layer of elastomer based on synthetic polymer reinforced with glass fiber cloth. Along with
On the concrete frame surface of the connection part of the above panel, a strip made of aluminum foil and rubber asphalt is glued to the rubber asphalt, and on the inner side of the storage tank, aluminum foil and unvulcanized butyl rubber are laid. Low-temperature liquefied gas and petroleum, characterized in that the joints are covered by an integrated strip, and the aluminum foil of both strips and the aluminum foil of the panel are bonded with polysulfide rubber. type of underground storage tank.