JPH0116757B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the infrastructure of tanks, particularly outdoor tank storage. More specifically, the present invention relates to a foundation structure for tanks built on a concrete pedestal, characterized in that an unvulcanized molded sheet having self-extinguishing properties is laid between the concrete pedestal and the tank bottom plate.

Conventionally, the foundation directly below the side plate of this type of tank has a structure in which the annular plate or bottom plate of the tank is directly laid on an annular concrete pedestal. In this structure, the space between the tank bottom plate (hereinafter also included the annular plate) and the concrete pedestal is not sealed, so it is not completely waterproof, and over a long period of time, rainwater etc. can enter from here. , corrodes the tank bottom plate. In addition, since the tank bottom plate is in direct rigid contact with the concrete pedestal, there is a risk that the contents of the tank may leak due to deformation and damage of the welded parts of the tank due to vibration. Cracks or damage may cause uneven settling of tanks.

Therefore, attempts have been made to lay asphalt-based or rubber-based materials between the concrete pedestal and the bottom plate in order to improve these defects, but asphalt materials deform and are also susceptible to heat, so they cannot be used at relatively high temperatures. It is unsuitable for containing the contents of a container, and it is difficult to withstand the high temperatures during welding of the bottom and side plates. Furthermore, these materials have insufficient flow resistance or durability, and also have problems in flame retardancy in the event of a fire.

The purpose of the present invention is to overcome the deficiencies of the conventional methods,
The basic structure of the tank uses a sheet with excellent flow resistance, durability, flame retardance, waterproofness, and cushioning properties, as well as excellent workability, so that it can withstand long-term use and poses little risk in the event of a fire. Our goal is to provide the following.

The object of the present invention is to provide a foundation structure for tanks in which a tank bottom plate is constructed on a concrete pedestal, in which (A)
100 parts by weight of recycled rubber and (B) 60 to 200 parts of inorganic filler
In an improved tank foundation structure characterized by laying a sheet formed by molding a composition consisting of parts by weight in an unvulcanized state, or in which a tank bottom plate is constructed on a concrete pedestal, Between the concrete pedestal and the tank bottom plate,
(A) 100 parts by weight of recycled rubber and (B) 60~60 parts by weight of inorganic filler
200 parts by weight, and 3% by weight or more of the inorganic filler (B) is aluminum hydroxide and/or magnesium hydroxide, and a sheet is formed in an unvulcanized state. This is achieved through improved tank infrastructure.

Hereinafter, specific examples of the present invention will be explained in more detail based on the drawings.

In FIG. 1, sand is spread on a stratum 1, and a pile 2 such as a composer or sand is placed. On top of that, a sand layer 3 of about 40 cm to 120 cm is provided, and its upper surface is covered with a waterproof layer of about 2 cm to 10 cm, such as oil sand 4. The surrounding area is covered with a waterproof and drainage layer such as asphalt or concrete 10 with a thickness of about 3 cm to 10 cm on top of a gravel or crushed stone layer 9 of about 5 cm to 15 cm. On the other hand, a tank bottom plate 5 (annual plate and bottom plate) is laid under the tank side plate 6, and a concrete pedestal 8 that reaches the stratum 1 is laid below it. An unvulcanized molded sheet 7 is laid between the concrete pedestal 8 and the tank bottom plate 5. The concrete pedestal is annular and integral with a radius approximately the same as the tank radius.

FIG. 2 shows another embodiment of the present invention,
A concrete pedestal 18 made of a concrete block is attached to the tank bottom plate 15 directly below the tank side plate 16.
be laid under the

The size of the concrete block is not particularly limited, but the length, width and height are approximately 10 mm each.
It is a rectangular parallelepiped with a size of about cm to 200 cm, preferably about 10 cm to 80 cm.

Beneath the concrete block pedestal 18, a pedestal holding layer 19 such as a ring-shaped layer of gravel, sand, or crushed stone is laid down so as to reach the stratum 11 and spread downward. An unvulcanized molded sheet 17 is laid between the concrete block pedestal 18 and the tank bottom plate 15. 12 is a pile, 13 is a sand layer, 14 is an oil sand layer, 19 and 20 are a crushed stone layer,
21 is a waterproofing and drainage layer made of concrete or asphalt.

As described above, in the present invention, the concrete pedestal may directly reach the stratum, or may have a structure in which blocks that do not reach the stratum are lined up.

As shown in FIG. 3, a concrete pedestal 18 made of concrete blocks is laid along the outer periphery of the tank, and gaps 23 between the concrete blocks are filled with a filler such as mortar. on a concrete block pedestal,
An unvulcanized molded sheet 17 is laid down, and the thickness of the unvulcanized molded sheet 17 is usually about 0.1 cm to 5 cm, preferably about 0.8 to 3 cm. Also, its size is
It is a flat plate-like object, usually about 10 cm to 100 cm, preferably about 15 cm to 80 cm, both vertically and horizontally.

In order to install these unvulcanized molded sheets 17 on the concrete pedestal, unvulcanized molded sheets consisting of a plurality of sheet blocks are laid out on the concrete pedestal, and if necessary, they are bonded to the concrete pedestal using an adhesive or the like. In order to make the gap between the sheets as small as possible, as shown in Figure 4, both ends of the unvulcanized sheet block are cut diagonally, and the cut ends are connected to the cut ends of the other rubber sheet blocks. It is preferable to lay them together on the concrete pedestal 18. Further, the gap between the sheets can be sealed with a suitable sealant or adhesive.

In addition to the embodiments shown in Figures 1 and 2, it is also possible to lay the entire foundation of the tank with concrete, use it as a concrete pedestal, lay an unvulcanized molded sheet over the entire upper surface, and then lay the tank bottom plate on top of this. .

The unvulcanized molded sheet as used in the present invention is a sheet molded in an unvulcanized state from a composition consisting of (A) 100 parts by weight of recycled rubber and (B) 60 to 200 parts by weight of an inorganic filler.

(A) Recycled rubber as used in the present invention refers to a used vulcanized rubber product, such as a product whose main component is so-called recycled rubber, which is obtained by crushing waste tires and then subjecting them to heat and pressure treatment to desulfurize and depolymerize them. . These recycled rubbers can be produced, for example, by the following steps.

(1) Grinding process (unpulverization, defibration) of waste rubber (waste tires, tubes, etc. from trucks, buses, passenger cars, etc.) (2) Desulfurization process Heating and pressure treatment (common use 15Kg/cm ³ , 200℃) (Desulfurization here does not actually remove the bound sulfur, but rather depolymerization by cutting some of the bridges in the vulcanized rubber network and some chains between the bridges.) (3) Finish Process: Particles of unpowdered rubber that have just finished desulfurization are crushed using a roll to plasticize them, and foreign matter is also removed to produce recycled rubber.

On the other hand, the inorganic filler (B) in the present invention refers to aluminum hydroxide, magnesium hydroxide, calcium carbonate, calcium silicate, magnesium silicate, aluminum silicate, silicon dioxide, magnesium carbonate, calcium sulfate, calcium sulfite. At least one compound selected from the group consisting of aluminum hydroxide,
Especially preferred are magnesium hydroxide and calcium carbonate.

In the present invention, the inorganic filler (B) is more preferably an inorganic filler in which 30% by weight or more, particularly 60% by weight or more of the total amount of the inorganic filler (B) is aluminum hydroxide and/or magnesium hydroxide. It is a filler. In this case, the molded sheet has excellent self-extinguishing properties, and a basic structure with excellent flame retardancy can be obtained.

In the present invention, the mixing ratio of (A) recycled rubber and (B) inorganic filler in the unvulcanized molded sheet is
The amount of component (B) is 60 to 200 parts by weight, preferably 80 to 180 parts by weight, per 100 parts by weight. If component (B) is not used, or if the amount of component (B) is less than the above range, the flame retardancy, flow resistance, or durability of the basic structure will be insufficient, and the Workability also decreases. On the other hand, if the amount of component (B) exceeds the above range, the cushioning properties of the basic structure
The waterproofness and durability become insufficient.

The unvulcanized formed sheet may be taken out in a thin sheet form from a roll and stacked as is to obtain a predetermined sheet thickness, or it may be kneaded with a mixer, a roll, etc. and then formed into a sheet with a roll. Furthermore, heating and pressure molding may be performed using a press or the like.

In addition, in the present invention, a small amount of regenerating agent, softening agent,
Adding process oil, fiber reinforcing agents, processing aids, anti-aging agents, etc., to the extent that the properties of the unvulcanized sheet are not significantly impaired.
Various high molecular weight materials such as rubbery materials, plastics, asphalt, etc. can be added.

According to the basic structure of tanks of the present invention, the unvulcanized molded sheet laid between the tank bottom plate and the concrete base has rubber-like elasticity, so that the seal between the base and the bottom plate is sufficient, and it is also resistant to vibration. It is also effective as a cushion material that does not cause damage to the tank. In addition, the unvulcanized molded sheet has good cold flow resistance, so there is little deformation after installation, and it also has heat resistance, so it is suitable for storing materials such as heavy oil that are kept warm at 50 to 80 degrees Celsius. and can withstand high temperatures during welding of the bottom plate during tank installation. Furthermore, since it is oil resistant, it is resistant to oil leaks and oily substances that are sprayed on the soil where the tank is placed for water resistance purposes.

Furthermore, as the unvulcanized molded sheet is used for a long time, vulcanization progresses successively and it comes to have properties similar to vulcanized rubber.

In addition, sheets containing recycled rubber do not contain substances that react with water and cause corrosion over long-term use, so there is no need for the tank bottom plate to corrode.

Furthermore, since recycled rubber is made from scrap rubber, its price is low and stable, making it economically advantageous.

[Brief explanation of drawings]

Fig. 1 is a sectional view of one embodiment of the present invention, Fig. 2 is a sectional view of another embodiment of the invention, and Figs. 3 and 4 are a plan view and a sectional view of the main parts of Fig. 2. show. 5...Tank bottom plate, 7...Unvulcanized molded sheet,
8... Concrete pedestal, 15... Tank bottom plate,
17... Unvulcanized molded sheet, 18... Concrete block pedestal, 23... Mortar joint filling.

Claims (1)

[Scope of Claims] 1. In the basic structure of tanks in which a tank bottom plate is constructed on a concrete pedestal, between the concrete pedestal and the tank bottom plate, (A) 100 parts by weight of recycled rubber and (B) 60 parts by weight of an inorganic filler. An improved basic structure for tanks, characterized in that a sheet formed from an unvulcanized composition of up to 200 parts by weight is laid. 2. In the basic structure of a tank where the tank bottom plate is constructed on a concrete pedestal, between the concrete pedestal and the tank bottom plate, a substance consisting of (A) 100 parts by weight of recycled rubber and (B) 60 to 200 parts by weight of an inorganic filler is placed between the concrete pedestal and the tank bottom plate. and (B) improved tanks, characterized in that they are covered with a sheet formed in an unvulcanized state from a composition in which 30% by weight or more of the inorganic filler is aluminum hydroxide and/or magnesium hydroxide. basic structure.