JPH0885907A - Water retentive paving block - Google Patents

Abstract

PURPOSE: To alleviate a heat island phenomenon or the like in towns and cities by providing a vessel-like water retentive tank with an upper face opened underneath of a water permeable paving block main body formed into a specified dimension of length, width and thickness, and integrating nonwoven fabric hanging down in the water retentive tank with the lower surface of the paving block main body. CONSTITUTION: When water is sprinkled by water sprinkling or rain onto paving blocks spread over on an existing floor bed or the like, the water permeates the inside of paving block main body 1 to be stored in the water retentive tank 2. Water overflowing the tank 2 is rapidly discharged through a drain ditch or the like. After rain or sprinkling, the water stored in the tank 2 rises because of a capillary phenomenon of nonwoven fabric 3 to permeate the inside of the paving block main body 1, and a properly moist state is maintained because of the permeating water, while a surface is kept in a dry state because of sunshine. When surface temperature is raised by the sunshine, the permeating water successively absorbes heat and vaporized and evaporated from the surface, while a quantity of evaporation is sequentially replenished from the tank 2. The paving block main body 1 is cooled by latent heat of vaporization so as to prevent an excessive temperature rise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-retentive pavement block for use in evaporative cooling, particularly in a pavement block laid on the roof or sidewalk of a building.

[0002]

2. Description of the Related Art The roof of a building or the road surface of an urban road is generally covered with concrete or asphalt. The temperature rise is remarkable inside, and this heat is radiated at night, which is one of the causes of deteriorating the thermal environment such as heat island phenomenon in urban areas.

On the other hand, although a system for lowering the temperature has been developed by planting natural turf as a unit, and there is an advantage that greening can be achieved, it is too expensive for a rooftop that expects only a thermal effect, There is a problem in practical use because there is damage due to walking on sidewalks.

Further, since the water sprinkling system on the rooftop has a high heat absorption rate of water, it is converted into water vapor by solar heat immediately after sprinkling and is not sustainable, which is preferable from the viewpoint of securing water resources. I can't say.

Further, it has been considered to use a water absorbing heat insulating material such as a calcium silicate plate for the pavement block, but this has a problem that the water absorbing ability of the material itself is not sufficient and it is easily soiled and weak in strength. .

The present invention is intended to solve the above problems. An object of the present invention is to provide an artificial water pool at the bottom of a pavement block to gradually evaporate the water stored in the pavement block and to reduce the latent heat of vaporization. The present invention provides a water retention pavement block that can be used for cooling the roof of a building or the surface of a walkway.

[0007]

In order to achieve the above-mentioned object, the present invention provides a water-permeable pavement block main body formed in a predetermined vertical and horizontal thickness dimension and an upper surface opening provided on the lower surface of the pavement block main body. It is characterized in that it comprises a container-shaped water retention tank and a nonwoven fabric which is integrated with the lower surface of the pavement block body and hangs down inside the water retention tank.

[0008]

According to the above construction, the water retention tank serves as an artificial pool of water, and water is stored in this area during rainfall or watering. The accumulated water rises due to the capillary phenomenon of the non-woven fabric,
The pavement block body evaporates and the pavement block is cooled by the latent heat of vaporization.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view showing a water retention pavement block according to the present invention, and FIG. 2 is a sectional view of the same.

The pavement block shown in the figure has a pavement block body 1 formed in a predetermined vertical and horizontal thickness dimension, and a container-shaped water retention tank 2 fitted on the lower surface of the pavement block body 1 and having the same outer diameter dimension. It consists of

The pavement block body 1 is a water-permeable precast block obtained by molding a water-permeable material such as open-celled concrete into a square having a length and width of 300 mm and a thickness of 60 mm. One end is integrated in a buried state and is suspended in the water retention tank 2.

The water retention tank 2 is a rectangular shallow bottom container made of a molded body of plastic, recycled plastic or the like and having an open top surface.
The depth is 00 mm and the depth is about 50 mm.

Further, guide posts 4 are erected at the four corners of the water retention tank 2 for both reinforcement and positioning of the pavement block body 1, and notches 1a formed at the four corners of the pavement block body 1 are used as guide posts. By descending along 4, the two are in agreement and can function as one pavement block.

Further, the laying method is the same as that of a general pavement block, and when installed, the pavement block has sufficient resistance to a load, a treading pressure and an impact applied to the upper part thereof, and has the same function as a normal pavement block. There is.

The pavement block having the above construction is used as a floor material for a rooftop of a building or as a paving stone block for a sidewalk, and the construction method is the same as the conventional one. For example, when laying on the rooftop of an existing building, Lay it on the floor 5, etc., and lay it vertically and horizontally. If necessary, it can be fixed by using an adhesive or a joint material.

When water is sprinkled on the paved blocks covered with water as shown by arrows in FIG. 2, the water permeates the inside of the pavement block body 1 and is stored in the water retention tank 2.

The amount of water retention per pavement block is approximately determined by the volume of the water retention tank 2, and the water that overflows the water retention tank 2 is promptly drained through conventional drainage channels as in the conventional case.

Therefore, after watering or rainfall, the water stored in the water retention tank 2 rises as shown by the arrow in FIG. 2 due to the capillary action of the nonwoven fabric 3 and permeates into the pavement block body 1. It maintains a moderately moist state, but its surface is kept dry by sunshine to prevent obstacles such as walking due to surface wetting.

When the surface temperature rises due to sunlight,
The permeated water sequentially absorbs this heat, vaporizes from the surface and is evaporated, and the evaporated portion is sequentially supplied from the water retention tank 2. The evaporated water cools the pavement block body 1 by its latent heat of evaporation, which prevents an excessive temperature rise.

Since this evaporation continues until the water stored in the water retention tank 2 is consumed, the cooling capacity is sufficiently maintained by a cycle of natural rainfall or occasional sprinkling of water when there is no rainfall. To do.

[0021]

As described above in detail with reference to the embodiments, in the water retention pavement block according to the present invention, the water retention tank serves as an artificial pool of water, and water is stored in this portion during rainfall or water sprinkling, The accumulated water rises due to the capillarity of the non-woven fabric and evaporates in the pavement block body,
The latent heat of vaporization cools the pavement blocks, so it suppresses excessive temperature rises on the rooftops and sidewalks of buildings in the summer, improving the thermal environment on the top floors and streets of buildings and reducing the cooling load. This is suitable for alleviating the heat island phenomenon in urban areas.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a water retention pavement block according to the present invention.

FIG. 2 is a sectional view of the same.

[Explanation of symbols]

 1 Water-permeable pavement block body 2 Water retention tank 3 Non-woven fabric

Claims (1)

[Claims] 1. A water-permeable pavement block body formed to have predetermined vertical and horizontal thickness dimensions, a container-shaped water retention tank having an upper surface opening provided on the lower surface of the pavement block body, and an integral body on the lower surface of the pavement block body. And a non-woven fabric suspended in the water retention tank.