JPH0363301A - Block for laying on the ground - Google Patents

Abstract

PURPOSE:To stay the rise of temperature on the surface of the earth with rainwater supplied to the stratum or being preserved over the surface of the earth by laying thereon platelike blocks each of which is made from a water- permeable member made of curable substance such as cement and a water- preserving member made of bricklike substance in minutely porous nature. CONSTITUTION:A square plate-like block 1 is trimmed in picture frame-like shape with a water-permeable member 2 made of curable substance such as cement having a number of thin through apertures, and the inside of the trimming is formed of a water-preserving member 3 made of bricklike substance in minutely porous nature mainly made of silty material. By laying such plate- like blocks over the surface of the earth, rainwater fallen to the surface of the earth is supplied to the stratum being permeated through the water- permeable member 2 and, at the same time, is preserved in the water-preserving member 3, which evaporates, as the temperature rises, the rainwater, absorbing latent heat in evaporation so that temperature rise can be stayed. Thereby circulation of water can be maintained, contributing to improvement of living environment in built-up area in a big city.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is installed on the ground surface, allows water such as rainwater to permeate and replenishes the strata, and retains water to prevent high temperature phenomena in urban areas. Concerning blocks to be relaxed.

[Problem to be solved by the invention]

One of the major causes of high temperatures in urban areas is concrete,
This is due to the fact that there are many dry areas covered with asphalt, etc., which increases heat accumulation.

Currently, permeable pavement, permeable blocks, and other products are being commercialized as measures to prevent rainwater from flowing straight into rivers, waterways, etc.

These permeable pavements and blocks allow water that reaches the surface to permeate, pass through, flow to the bottom, and be absorbed into the ground, so they have the effect of replenishing the strata with water.

However, these pavements and blocks are heated by sunlight on the same side as conventional concrete and asphalt, and the surface temperature can reach 50 to 60 degrees Celsius in the summer and 30 to 40 degrees Celsius at night.
The effect of water evaporation from the bottom strata on cooling is small, and like concrete and asphalt, it is one of the factors that causes high temperatures in cities and tropical nights.

This invention was made in view of the above circumstances. Its purpose is to be laid on the ground surface so that water such as rainwater that falls on the ground surface can pass through and replenish the strata, and it also retains water and at high temperatures absorbs the latent heat of evaporation and evaporates, increasing the temperature. We propose a surface-laying block that can alleviate this problem.

[Means to solve the problem]

This block for laying on the ground surface is characterized by having a water-permeable part that allows surface water to pass through to the lower layer and a water-retaining part that absorbs water.

The water-permeable portion of this block can be the same as a conventional water-permeable block. For example, there are cured products using millet-like cement as a binder with many communicating gaps, hardened products with many through holes, and metal materials. The water-retaining portion exhibits water-retaining properties by absorbing water through chemical wood-philicity of the substance and physical water-absorbing properties such as capillarity. For example, brick-like materials made of hydrophilic substances such as loam, silt, clay, and diatomaceous earth, aggregates such as natural glassy hollow granules with microscopic spaces that allow water to enter, such as whitebait, or binders of these materials such as cement. It consists of an aggregate, etc. enclosed in a cured water-permeable material bonded with. The amount of water retained is preferably one that can maintain water retention for about 24 hours at high temperatures in summer.

This block usually has a rectangular or hexagonal shape with a side of 10 cm to several tens of cm, and is strong enough to withstand walking or vehicular traffic when laid on the ground. For this purpose, reinforcing it by burying reinforcing bars or covering it with a frame with high rigidity as necessary.

[For production]

The water retaining part of this ground-laying block absorbs water such as rainwater and retains water, so when the temperature rises due to sunlight, etc., the retained water evaporates and takes away the latent heat of evaporation, causing the block to become hotter and heat accumulate. It is possible to reduce the temperature in the area where the blocks are laid. In addition, surplus water that has not been absorbed by the water-retaining portion can permeate through the water-permeable portion and permeate into the stratum, thereby replenishing groundwater.

In addition, if the block is made of a color with good heat absorption and low brightness, such as reddish brown, moss green, or dark blue, the illuminance of sunlight reflected back will be lower than that of concrete blocks or white stone, which will prevent glare. Increased effectiveness.

〔Example〕

The present invention will be explained below with reference to illustrated embodiments.

The block 1 for laying on the ground shown in Fig. 1 has a rectangular plate shape,
It consists of a water-permeable part 2 surrounding the frame-like shape and a water-retaining part 3 inside the water-permeable part 2. The water-permeable part 2 is made of a cement-based hardened material having many narrow communication gaps, and the water-retaining part 3 is made of a microporous brick-like material mainly made of silt.

The block 1 for laying on the ground shown in FIG. 2 has a rectangular plate shape and consists of four parallel strips of water-permeable sections 2 and three strips of water-retaining sections 3 arranged therebetween.

FIG. 3 shows an embodiment of a block assembly in which rectangular plate-shaped blocks 1 each having a band-shaped water-permeable portion 2 on one side and a water-retaining portion 3 on the other side are laid out on the ground surface.

Test date of surface temperature with the block of the example (Table 1); 198B, 8.21 Note * Sample of the block shown in Figure 1 soaked with water *2: Commercially available concrete millet Water-permeable block*
3; Sample obtained by sprinkling water on a commercially available brick to impregnate it with water. According to Table 1 above, the water-sprayed block was found to have the same temperature reduction as the base material. Uchimizu bricks also performed the same function.

According to Table 2, compared to the reflection of water-permeable blocks made of concrete, the reflection of water is significantly reduced in the case of water-spun blocks. Asphalt pavement has low reflected illuminance and does not cause glare, but
I feel the heat strongly.

〔Effect of the invention〕

The present invention is as described above, and this ground-laying block can be laid on the ground in urban areas, etc. to alleviate the rise in temperature due to heat accumulation. At the same time, it becomes possible to supply water to the strata, maintain the water circulation system, and contribute to improving the living environment in urban areas of large cities.

[Brief explanation of drawings]

Figures and sectional views, and Figure 3 are perspective views of an assembly of blocks laid on the ground. ■... Block for ground installation, 2... Permeable part, 3...
・Water retention part.

Claims (1)

[Claims] (1) A block to be laid on the ground surface, characterized in that the block has a water-permeable part that allows surface water to pass through to the lower layer and a water-retentive part that absorbs water.