JPH10314723A - Soaking structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent contamination of soil by adsorbing and fixing heavy metals dissolved or suspended in rain water falling on the ground. SOLUTION: Crushed stone layers 3 are laid around soaking pipes 1 penetrating rain water in such a process that rain water falling on the ground is passed and a soaking well 2 for storing water and penetrating the stored water. Also, the crushed stone layers 3 are covered with water-permeable sheets 4. The soaking pipes 1 and the soaking well 2 having porous pipe walls are constituted by mixing crushed bodies obtained by crushing trace radiative rare earth ore containing natural thorium and natural uranium, calcined body obtained by crushing trace radiative rare earth ore and mixing its powder with the ceramics raw material and burning the mixture and crushed bodies obtained by crushing the above-mentioned calcined body, with porous concrete material and using the mixed material for molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the collection and distribution of rainwater or the like that has fallen on the surface of the earth, and the storage of the rainwater. In the course of this distribution and storage, when water permeates into the ground, it absorbs heavy metal ions dissolved in the water. It relates to a permeation structure that can be fixed.

[0002]

2. Description of the Related Art Rainwater, which has fallen on the ground surface, for example, a road, a park, or a residential area, is collected in a gutter, distributed through a conduit composed of distribution pipes, and stored in a storage pipe. There is a system that tries to infiltrate into the ground. With this system, it is possible to reduce the temporary rise of rivers during precipitation and recharge groundwater.

[0003] The infiltration system uses an infiltration tube having a permeation hole formed around both the flow pipe and the storage pipe. A crushed stone element is laid around the infiltration pipe with a predetermined thickness, and the crushed stone element is seated with a sheet element. It is configured so as to be wrapped so that water flowing or stored in the infiltration tube can penetrate into the ground through the infiltration hole, the crushed stone element and the sheet element. In particular, since the crushed stone element is wrapped in the sheet element, the surrounding earth and sand do not enter between the crushed stone elements, and a good infiltration action can be maintained.

On the other hand, various exhaust gases and fine powders of heavy metals mixed into the atmosphere are present on the road surface. Therefore, in rainy weather, the heavy metals dissolve or suspend in rainwater, and the rainwater permeates the ground.

[0005]

In the above water infiltration system, heavy metals dissolved or suspended in rainwater may penetrate into the ground and contaminate the soil over a long period of time. For this reason, it is preferable to separate and fix heavy metals in the process of rainwater penetration.

It is an object of the present invention to provide a permeation structure capable of adsorbing and fixing heavy metals dissolved in rainwater.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, a permeation structure according to the present invention has a porous structure capable of permeating flowing water or stored water into the ground and generating a small amount of hydroxyl ions. A crushed material obtained by crushing a radioactive rare earth ore or a powder obtained by crushing a trace amount of radioactive rare earth ore is mixed with a ceramic material and fired, or a crushed stone is formed around an underground structure obtained by mixing the crushed material obtained by crushing the fired body. It is characterized by being laid.

[0008] In the above-mentioned infiltration structure, a trace radioactive rare earth ore that generates hydroxyl ions in an underground structure such as a porous infiltration tube or an infiltration well in order to infiltrate circulating water or stored water into the ground is crushed. A crushed body or a powder obtained by crushing a trace amount of radioactive rare earth ore was mixed with a ceramic raw material, and then a fired body or a crushed body obtained by crushing the fired body was mixed. When penetrating the crushed stone layer, hydroxyl ions, which are negative ions, are generated in the water by the action of radiation emitted from the trace radioactive rare earth ore. Therefore, when water in which heavy metals are dissolved or suspended by flowing on the ground surface penetrates into the ground from underground structures, the ions of heavy metals dissolved in water by the generated hydroxide ions are adsorbed and fixed. Can be done. Also, even if there is organic matter in the water flowing over the ground,
The hydroxyl ions can be fixed by adsorption.

In the above infiltration structure, it is preferable to cover the underground structure and the crushed stone layer laid around the structure with a water-permeable sheet having water permeability. In this way, by covering the periphery of the crushed stone layer with a water-permeable sheet having water permeability, water flowing in the underground structure penetrates into the ground from the structure through the crushed stone layer and the water-permeable sheet. And prevent the surrounding earth and sand from invading the crushed stone layer side to prevent clogging.

When a fired body is formed by mixing powder obtained by crushing a trace amount of radioactive rare earth ore, it is preferable that not only ceramic material but also ceramic material and sludge incineration ash be contained as ceramic materials. By using such a ceramic raw material, various fired bodies can be manufactured.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the above-mentioned permeation structure will be described below with reference to the drawings. FIG. 1 is a schematic diagram illustrating a schematic configuration of a permeation structure. FIG. 2 is a diagram illustrating a structure of a junction between a permeation well configured by vertically disposing permeation tubes and a permeation tube disposed horizontally by a permeation tube. FIG. 3 is a cross-sectional view illustrating a structure of a permeation tube portion.

[0012] The infiltration structure is such that rainwater or the like that has fallen on the surface of the ground is passed through an infiltration tube 1 which is an underground structure buried in the ground.
In the same way as described above, the water is collected in the infiltration well 2 which becomes an underground structure, and can be penetrated into the ground in the course of flowing through the infiltration tube 1 or from the infiltration well 2. A crushed stone layer 3 is laid around the infiltration tube 1 and the infiltration well 2.

In the crushed stone layer 3, voids are formed between the individual crushed stones, so that the earth and sand constituting the soil may enter the voids and sink the ground surface. Therefore, the crushed stone layer 3
Is covered with a water-permeable sheet 4 so that the permeation tube 1 and the permeation well 2
The water that has flowed out of the crushed stone layer 3 and passed through the crushed stone layer 3 is filtered, and soil and sand from the soil are prevented from entering the crushed stone layer 3, thereby preventing land subsidence.

The infiltration tube 1 is buried in a side groove 5 so as to connect a square 6 and a manhole-shaped infiltration well 2 arranged at a predetermined interval. Accordingly, rainwater or the like that has fallen on the ground surface flows through the infiltration pipe 1 through the gutter 5 to the gutter 6 and is stored in the infiltration well 2.

The permeation tube 1 is configured such that water flowing inside can permeate outside through the tube wall. That is, the osmosis pipe 1 is obtained by mixing a crushed body obtained by crushing a trace radioactive rare earth ore containing natural thorium or natural uranium which generates hydroxyl ions in contact with water or a powder obtained by crushing a trace radioactive rare earth ore into a ceramic raw material. The fired body or a crushed body obtained by crushing the fired body is mixed with a porous concrete material to form a molded body. Therefore, when the water flowing through the permeation tube 1 passes through the porous tube wall, it comes into contact with the mixed trace radioactive rare earth ore to generate hydroxyl ions, which are dissolved or suspended in the passing water by the hydroxyl ions. It is possible to adsorb and fix the heavy metal ions.

The infiltration well 2 is basically composed of a cylindrical pipe 7, a sloping wall pipe 8, and a lid 9 similarly to a manhole in a sewer pipe.
And so on. In particular, the cylindrical pipe 7 has the bottom plate 10 installed at a deeper position than the manhole of the sewer pipe, and is configured to be able to store a sufficient amount of water.

The cylindrical tube 7 constituting the infiltration well 2 has the same function as the infiltration tube 1, and is a crushed body or a trace radioactive rare earth element obtained by crushing a trace radioactive rare earth ore which comes into contact with water to generate hydroxyl ions. A fired body obtained by mixing ore crushed powder with a ceramic raw material and firing the fired body or a crushed body obtained by crushing the fired body is mixed with a porous concrete material and formed.

The fired body to be mixed with the above-mentioned porous concrete material is formed into a gravel or crushed stone obtained by crushing a trace radioactive rare earth ore containing natural thorium or natural uranium into powder and mixing with a ceramic raw material to fire. Have been. The ceramic raw material for forming the fired body is not limited to the raw material of so-called fine ceramics, and it is possible to use clay which is an old ceramic raw material such as pottery, and it is also possible to use sewage sludge or other sludge. Sludge incineration ash generated by incineration can also be used as a raw material. As a component of typical sludge incineration ash, CaO, 31.2
_{%, SiO 2, 23.3%,} Fe 2 O 3, 13.6%, Al 2 0 3, are those containing 8.5%.

In the above fired body, when the fired body is submerged, water is decomposed into a positive ion of hydrogen and a negative ion of hydroxide ion by the action of radiation emitted from the trace radioactive rare earth ore, and further, the hydroxide ion is converted into water. It is possible to adsorb and fix the heavy metal ions present in the water.

The water-permeable sheet 4 is constituted by a sheet of synthetic resin fibers woven into a cloth. For this reason, the water permeable sheet 4 can allow water to pass freely, and can cover the crushed stone layer 3 to prevent intrusion of earth and sand.

Next, a method for realizing the above-described permeation structure will be briefly described. In this permeation structure, the crushed stone layer 3 is laid around the permeation pipe 1 and the permeation well 2, and the crushed stone layer 3 is covered with the water-permeable sheet 4.

That is, excavation is performed at a predetermined depth along the buried path of the infiltration pipe 1 and a predetermined position of the infiltration well 2 is excavated at a predetermined depth. The digging bottom is rolled and the permeable sheet 4 is spread. Next, the crushed stone layer 3 was placed on the permeable sheet 4 for 35 minutes.
Roll it down by laying it down to a thickness of 60 cm to 60 cm.
Laying while connecting. At a position corresponding to the infiltration well 2, the bottom plate 10, the cylindrical pipe 7, and the inclined wall pipe 8 are sequentially stacked on the crushed crushed stone layer 3, and the infiltration pipe 1 is connected to a predetermined cylindrical pipe 7.

Thereafter, the crushed stone layer 3 is laid on both sides and the upper part of the infiltration tube 1 and the infiltration well 2 to a thickness of 35 cm to 60 cm, and is compacted.
Further, the upper portion of the crushed stone layer 3 is covered so as to involve the water-permeable sheet 4 and backfilling is performed, thereby completing the infiltration structure.

In the infiltration structure configured as described above, the rainwater that has fallen on the surface of the earth and that has been ionized due to the dissolution or suspension of heavy metals flows through the infiltration pipe 1 through the gutters 5 and 6 to penetrate. Store in well 2.

The water flowing inside the infiltration tube 1 and the water stored in the infiltration well 2 penetrate into the crushed stone layer 3 through each of the porous tube walls. At this time, the water comes into contact with the crushed body or powder of the trace radioactive rare earth ore mixed with the material constituting the permeation tube 1 and the permeation well 2, and ionization is promoted, and a large amount of negative ions are generated. The generated negative ions adsorb and fix heavy metal ions present in water, and new negative ions are generated. This reaction continues while water flows out of the infiltration tube 1 and the infiltration well 2, and the water from which heavy metal ions have been removed permeates into the ground.
Therefore, there is no risk of contaminating the soil with heavy metals.

Further, by covering the crushed stone layer 3 with the water permeable sheet 4, the water permeable sheet 4 functions as a screen to prevent the surrounding earth and sand from entering the layer of the crushed stone layer 3 and always provide good penetration. The performance can be maintained, and the settlement of the ground can be prevented.

[0027]

As described in detail above, in the infiltration structure according to the present invention, the infiltration pipe and the infiltration well, which are porous underground structures, are used to infiltrate the circulating water or the stored water into the ground. Even if heavy metals are dissolved in rainwater that has fallen to the surface of the ground, by using a material obtained by mixing crushed or powdered trace radioactive rare earth ores that generate hydroxyl ions as negative ions, When the water penetrates into the crushed stone layer from the porous wall of the permeation tube and permeation well, the heavy metal dissolved by the generated hydroxyl ions can be adsorbed and fixed. For this reason, there is no possibility of contaminating the soil in which water has penetrated.

Also, by covering the pipe and the crushed stone layer with a sheet having water permeability, water flowing in the pipe can permeate into the ground from the pipe through the crushed stone layer and the water permeable sheet, and the earth and sand can be removed. It does not enter the crushed stone layer and cause clogging.
For this reason, water permeability can be maintained in a favorable state.

Also, various fired bodies can be manufactured by using porcelain raw materials, pottery raw materials, and sludge incineration ash as ceramic raw materials for forming the fired bodies.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a schematic configuration of a permeation structure.

FIG. 2 is a diagram illustrating a structure of a joint between a permeation well configured by vertically arranging permeation tubes and a permeation tube arranged horizontally.

FIG. 3 is a cross-sectional view illustrating a structure of a permeation tube portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Infiltration pipe 1a, 9a Infiltration hole 2 Infiltration well 3 Crushed stone layer 4 Water-permeable sheet 5 Gutter 6 Masu 7 Cylindrical pipe 8 Sloping wall pipe 9 Cover 10 Bottom plate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Fujio Senba 1-22-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Haneda Hume Kanko Co., Ltd. (72) Inventor Teruichi Nishizaki 446 Luyoshiji Town Nishizaki Textile Co., Ltd.

Claims (3)

[Claims] 1. A crushed body obtained by crushing a trace radioactive rare earth ore or a powder crushed from a trace radioactive rare earth ore, which is porous and generates hydroxide ions in order to allow the water flowing or stored to permeate the ground. A osmotic structure, wherein crushed stone is laid around a fired body mixed with a raw material and fired or an underground structure in which a crushed body obtained by crushing the fired body is mixed. 2. The infiltration structure according to claim 1, wherein the crushed stone laid around the underground structure is covered with a water-permeable sheet having water permeability. 3. The infiltration structure according to claim 1, wherein the ceramic raw material includes a porcelain raw material, a ceramic raw material, and sludge incineration ash.