JPH0330653B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to the basic structure of a high temperature tank for storing relatively high temperature (160-230°C) fluids such as liquid sulfur and molten asphalt.

BACKGROUND ART Conventionally, the basic structure of a tank has been one in which an embankment is placed directly below the tank bottom plate, and oil sand, asphalt sand, or the like is laid on top of the embankment.

These are watertight and have the effect of preventing moisture such as groundwater from entering under the tank bottom plate and preventing corrosion of the tank bottom plate. However, in the above structure, if the contents of the tank are high temperature, the oil sand or asphalt sand will melt and lose its watertightness.
A strange odor was generated, and there was a risk that groundwater, rainwater, etc. would infiltrate under the tank bottom plate, accelerating erosion of the tank bottom plate.

Problems to be Solved by the Invention In view of the problems of the prior art described above, an object of the present invention is to provide a new foundation structure that maintains watertightness even at high temperatures.

Means for Solving the Constituent Problems of the Invention As a result of intensive research into the above-mentioned problems, the present inventors have found that if the heat insulating properties of perlite concrete and the water tightness of a heat-resistant waterproof sheet or an asphalt spray layer are used, high-temperature tanks can be The present invention was achieved by discovering that erosion caused by moisture intrusion into the bottom plate can be prevented.

That is, the present invention provides a foundation layer in which the ground beneath the tank bottom plate is dug and replaced with good quality soil, an asphalt sprinkled layer and/or a heat-resistant waterproof sheet laid on top of the foundation layer,
A layer of perlite concrete poured on top of it,
Furthermore, the basic structure of the high temperature tank is characterized by comprising a layer of dry sand laid on top of the dry sand layer.

The present invention will be explained in detail below based on the accompanying drawings. FIG. 1 shows an example of an embodiment of the present invention, in which a foundation layer 2 is provided by digging the ground 1 and replacing it with good quality soil. Good quality soil is used to strengthen the ground strength, and it is preferable to use sand, gravel, crushed stone, etc. as the material.

An asphalt dispersion layer 3 is laid on the base layer 2. The asphalt spreading layer 3 is preferably one in which fine aggregate made of sand and gravel is spread evenly, and asphalt is spread on the surface thereof. Further, asphalt sand or the like may be used as the asphalt scattering layer.

In the example of FIG. 1, asphalt sprinkled layer 3
Further, a heat-resistant waterproof sheet 4 is laid on top of this. As the heat-resistant waterproof sheet, for example, a heat-resistant vinyl sheet can be used.

Asphalt spray layer 3 and heat-resistant waterproof sheet 4
forms a watertight layer, which prevents moisture from escaping inside the pearlite concrete during pouring and curing periods, and also prevents moisture from rising from below after pouring. If the temperature of the tank is not very high, one of the asphalt spread layer and the heat-resistant waterproof sheet may be omitted.

Perlite concrete is placed on top of the heat-resistant waterproof sheet 4. In principle, reinforcing bars are inserted inside the pearlite concrete layer 5. The perlite concrete layer 5 prevents heat from the upper tank from being transmitted downward due to its insulating effect. The standard thickness of the pearlite concrete layer 5 is about 300 mm, but it can be increased or decreased as appropriate depending on the temperature of the tank.

If the heat-resistant waterproof sheet is omitted, a perlite concrete layer is provided directly on top of the asphalt spread layer.

In principle, dry sand with adjusted particle size is spread on the upper surface of the perlite concrete layer 5 in order to improve its compatibility with the tank bottom plate 7. The thickness of this dry sand layer 6 is preferably about 100 to 150 mm.

Note that a concrete ring 8 is constructed to stably hold each layer configured as described above. In principle, reinforcing bars are inserted inside the concrete ring 8.

The area between the upper edge of the concrete ring 8 and the lower edge of the tank is covered with asphalt mortar 9 or asphalt sand as a slope, and a sealing material 11 is used around the bottom of the tank side plate 10 to prevent moisture such as rainwater from reaching the tank bottom plate. prevent intrusion. Furthermore, depending on the paving conditions around the concrete ring, 1 piece of asphalt mortar may be used to protect the apron from rain.
Lay the 2nd class.

FIG. 2 shows another example of the embodiment of the present invention, in which a concrete ring 8 is constructed directly under the tank side plate 10. The structure of the main parts is the same as that shown in Figure 1, but in this figure, a cushion material 1 is placed between the upper edge of the concrete ring and the tank bottom plate 10.
3 is installed, and an expansion joint 14 is inserted between the side surface of the concrete ring and the pearlite concrete. Asphalt-based materials can be used for both materials.

Function The present invention prevents the watertight layer, which is a heat-resistant waterproof sheet and/or asphalt spray layer, laid below the perlite concrete layer from dissolving by providing a perlite concrete layer with a heat insulating effect below the tank bottom plate. Conversely, these watertight layers are effective in curing the perlite concrete by preventing the moisture inside the perlite concrete from escaping during the pouring and curing period, and after pouring, underground water and other moisture are absorbed into the tank. Prevents it from entering the bottom plate.

Effects of the Invention As explained above, the basic structure of the high-temperature tank of the present invention prevents the melting of the asphalt spray layer and/or the watertight layer, which is a heat-resistant waterproof sheet, by providing a perlite concrete layer with a heat-insulating effect. , its watertightness can be expected to last semi-permanently.

This watertight layer also blocks moisture from underground and maintains the insulating properties of perlite concrete semi-permanently. In this way, in the present invention, the perlite concrete layer, which has a heat insulating effect, and the watertight layer mutually take advantage of their properties, and as a result, corrosion of the tank bottom plate is effectively prevented.

[Brief explanation of drawings]

FIGS. 1 and 2 are cross-sectional views of a tank and a foundation in the high-temperature tank foundation structure of the present invention. 1st
The figure shows a case where a concrete ring having a diameter larger than the tank diameter is constructed, and Figure 2 shows a case where a concrete ring is constructed directly under the tank side plate.

Claims (1)

[Claims] 1. A foundation layer in which the ground beneath the tank bottom plate was dug and replaced with good quality soil, an asphalt spread layer and/or a heat-resistant waterproof sheet laid on top of it, a perlite concrete layer poured on top of it, and a layer of perlite concrete laid on top of it. The basic structure of a high-temperature tank is characterized by consisting of a dry sand layer.