JPH0941314A - Water collecting underground structure of green and green agricultural chemical septic tank and green agricultural chemical elimination facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive saving the execution of work. SOLUTION: The bottom of an underground yard 10 under the green is slanted at the lowermost depth at the central part of the bottom, thereby forming a slanted surface of the surrounding bottom 12. The inside area of the underground yard 10 is covered with an impervious sheet 12. A trunk line of an aqueous duct is laid out on the lower-most depth 11 of the bottom. A single particle crushed stone layer is provided on the lower layer of the underground yard 10 and a mixed sand layer is provided thereon. An agricultural chemical septic tank is formed with one septic tank 100 provided with a particulate activated coal-based filter layer where a small gravel layer C is provided on the lower layer of the tank. An inflow pipe 200, whose end is opened, is provided on the upper part of the tank. There is provided a drain pipe 300 whose one end is opened in the small gravel layer and whose other end is opened outside the tank. An overflow pipe 400, which is branched from on the way of the drain pipe 300 and opens its pipe end in the upper part of the tank, is provided on the drain pipe 300. Their underground structure of the green and the agricultural chemical septic tank are connected with each other, thereby constituting an agricultural chemical removable facility.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground structure for collecting greens, an agrochemical septic tank, and the like for removing agricultural chemicals sprayed on golf course greens and the like.

[0002]

2. Description of the Related Art The lawn of a golf course must be sprayed with so-called pesticides such as herbicides and fertilizers for maintenance.
However, such spraying of pesticides seriously affects the surrounding environment of the golf course because the pesticide that has penetrated into the ground is mixed into the groundwater. For this reason, sprayed pesticides were once collected as pesticide-contaminated water in a water collecting culvert buried underground in the green of the golf course, and then sent to a 2-tank type pesticide septic tank located underground.
Agricultural chemicals are removed by the filtration layer in the tank. For example, in a conventional underground structure for water collection in which a drainage conduit is buried under a green, as shown in Fig. 3 (a), a first step box-shaped hole with a flat bottom is drilled under the green. In addition, the trench of the second step is excavated from the bottom of the first step. The inside of the excavated underground yard is covered with a water-blocking sheet, and a drainage culvert is laid inside the second-stage excavation yard in the center. A single-grain crushed stone layer is formed in the second-stage excavation groove and in the lower layer of the first-stage hole.
A mixed sand layer is provided on it. In this way,
The pesticides sprinkled on the green grass penetrate into the ground and are collected as contaminated water in the underdrain for collecting water. In addition, in the culvert for water collection, a branch line is branched from one trunk line like a vein,
It can collect water over a wide area.

On the other hand, as shown in FIG. 3 (b), a pesticide septic tank is buried adjacent to the water collecting underdrain under the green, being connected to the water collecting underdrain. For example, as a pesticide purifying tank, conventionally, as shown in Fig. 3 (c), a tank provided with a filter layer composed of a small gravel layer and a granular activated carbon layer, and water after the pesticide removal that has passed through the filter layer is stored and drained. The possible tank is configured as a two-tank type that is adjacent to the other through a partition and a screen. The upper part of the inside of the tank between these two tanks is further connected by an overflow pipe. In this way, the pesticide removal equipment consisting of the water collecting underdrain buried under the green and the pesticide septic tank connected to it is buried under the green or the tee ground and its surroundings.

[0004]

However, in the conventional underground structure for collecting water under the green in which the underdrain for collecting water is buried, a rectangular box-shaped hole is formed by flattening the bottom and excavating in two steps. Has been drilled. Therefore, it is necessary to excavate the bottom surface flat and also excavate the center part of the bottom surface into a rectangular box shape, which makes the excavation work more troublesome and time-consuming than when forming a uniform bottom surface with no uneven steps. . On the other hand, since the pesticide purifying tank connected to such a water collecting underdrain is of a two-tank type, the tank itself becomes large-scale, and the excavation work for burial becomes large. Furthermore, the installation of the septic tank is troublesome, and the development of technology for making the septic tank compact has been desired.

Furthermore, since the branch line of the conventional underdrain for collecting water is laid almost flat with respect to the main line, there is a concern that the flow of the pesticide-contaminated water collected may become stagnant. Therefore, in addition to the above problems, it is also important that the pesticide-contaminated water that has permeated underground after the pesticide has been sprayed can easily flow from the branch line of the water collecting underdrain to the main line. Therefore, in view of the above problems, the present invention is a green underground structure that can save labor in construction,
And the provision of pesticide septic tanks.

[0006]

In order to solve the above-mentioned problems, the present invention provides a water collecting underdrain consisting of a trunk line and a branch line branching from the trunk line at the bottom of an underground premises whose inside is covered with a water-blocking sheet. In the underground structure for water collecting of the green of the golf course where the culvert for water collection is buried with a single-grain crushed stone layer and a mixed sand layer is further provided on the single-grain crushed stone layer, the bottom portion is the deepest in the center of the bottom. The peripheral bottom surface is formed as an inclined surface toward the section, and the trunk line of the water collecting underdrain is laid at the deepest portion of the bottom section.

[0007] Further, an inflow pipe connected to a water collecting culvert buried under the green of the golf course and a discharge pipe connecting to an external rainwater culvert are provided to remove pesticide-contaminated water from the water collecting culvert. Pesticide removal is performed through the filtration layer in the tank, and in the pesticide purification tank for green that drains the water after the pesticide removal to the rainwater culvert, the pesticide purification tank is provided with a small gravel layer in the lower layer of the tank. It is composed of one septic tank with a granular activated carbon filter layer provided on the top, and the septic tank is provided with an inflow pipe with an open pipe end in the upper part of the septum, and one pipe end is opened in the small gravel layer. A drain pipe having the other pipe end opened to the outside of the tank is provided, and further, an overflow pipe having a pipe end that is branched from the middle of the discharge pipe and has an open pipe end is provided above the tank.

In addition, at the bottom of the underground structure which is provided under the green of the golf course and whose inside is covered with a water-blocking sheet, two layers of a single-grain crushed stone layer as a lower layer and a mixed sand layer as an upper layer are formed. A drainage culvert consisting of a trunk line buried in a single-grain crushed stone layer and a branch line branching from it is provided in the tank with a filter layer for removing pesticides from the pesticide-contaminated water entering from the inflow pipe. In a pesticide removal equipment for greens, which is connected to the inflow pipe of a pesticide septic tank provided with a discharge pipe for draining water into a rainwater drain, the bottom of the underground structure is inclined toward the deepest part in the center of the bottom and the surrounding bottom surface is an inclined surface. To form
A trunk line of the underdrain for water collection is laid at the deepest part of the bottom, the pesticide purification tank is provided with a small gravel layer in the lower layer in the tank, and a filtration layer of granular activated carbon is provided on the small gravel layer. The septic tank is provided with the inflow pipe having an open pipe end in the upper part of the septic tank, and one pipe end is opened in the small gravel layer and the other pipe end is opened outside the septic tank. The discharge pipe is provided, and further, the discharge pipe is provided with an overflow pipe branched from the middle of the discharge pipe and having an open pipe end above the tank.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) In this embodiment, an underground structure for collecting water according to the present invention will be described. In the underground structure for water collection of the present embodiment, the underground is excavated in a substantially columnar shape in accordance with the substantially circular green. The excavation depth of the excavated underground yard 10 is, as shown in FIG.
However, the depth of the first-stage hole in the conventional underground yard shown in FIG. 3 (a) is set to about the depth (for example, 500 mm from the surface of the mixed sand layer), and the excavation depth is about 300 mm shallower than conventional. Further, the deepest portion 11 at the center of the bottom portion is provided so as to cross the central portion of the substantially circular bottom portion in a band shape with a width of about 300 mm, and the bottom surface 12 around the bottom portion is formed as an inclined surface toward the deepest portion 11. .

In the present embodiment, the inner surface of the underground yard 10 excavated in the above-mentioned shape is entirely covered with a water-blocking sheet 20 having a thickness of 2 mm, which is the same as the conventional one, and pesticide-contaminated water that has penetrated underground is sunk in the underground yard. It is stopped at 10 and the pesticide-contaminated water cannot penetrate below it. One trunk line 30 of a water collecting underdrain is laid along the strip-shaped deepest part 11 in the center of the bottom of the underground yard 10 covered with the water-blocking sheet 20. Further, as shown in FIG. 2A, a large number of branch lines 30a of the water collecting underdrain are branched from the left and right of the main line 30. In the present embodiment, the 100φ seepage pipe is used as the trunk line 30 of the underdrain for collecting water,
A 75φ permeation tube is used as each branch line 30a of the water collecting underdrain. The branch line 30a is shown in FIG.
As shown in FIG. 2, the branch lines are provided along the left and right inclined bottom surfaces 12 of the trunk line 30. Therefore, the branch line 30a is inclined toward the main line 30 so that the pesticide-contaminated water collected can easily flow into the main line 30.

With the water collecting underdrain thus laid, the single-grain crushed stone layer A is provided so as to have a thickness of 150 mm from the deepest portion 11 as shown in FIG. 1 (a). . Furthermore, on this single-grain crushed stone layer A, a thickness of 350 mm
A mixed sand layer B similar to the conventional one is provided. A green (not shown) is provided on it. The single-grain crushed stone and the mixed sand that have been conventionally used are used in the present embodiment. In the green underground structure for collecting water of the present embodiment, the depth of excavation in the underground yard is 300 mm shallower than the conventional structure, but the same water collecting effect as in the conventional structure can be obtained. Therefore, labor saving of excavation work can be achieved.

(Embodiment 2) In this embodiment, a pesticide septic tank according to the present invention will be described. The agrochemical septic tank of this embodiment is composed of one septic tank 100 formed of fiber-reinforced reinforced plastic (FRP). In the present embodiment, the septic tank 100 has a height of 1750 mm and a width of 1360 mm. For comparison, FIG.
In (c), a conventional KR-S type having a purifying function similar to that of the present embodiment is shown. The width of the conventional two-tank type is 1
Since it is 800 mm, it can be seen that the present embodiment achieves a considerable reduction in size. A hatch 110 for inspection is provided at the upper end of the septic tank 100. In the tank, a small gravel layer C is in the lower layer, and a granular activated carbon filtration layer D is in the upper layer.
Is provided. The small gravel layer C and the filtration layer D of the granular activated carbon may be those conventionally used, and the small gravel layer C is formed thinner than the filtration layer D. Incidentally, in this embodiment, the small gravel layer C is 100 m.
m, the filtration layer D of granular activated carbon is formed to a thickness of 400 mm.

On the upper side surface 100a in the septic tank 100,
An inflow pipe 200 is provided so as to penetrate, and one pipe end is opened into the tank. The other pipe end can be connected to a water collecting underdrain buried under the green by using a connecting pipe (not shown) or the like. In this way, the pesticide-contaminated water introduced from the inflow pipe 200 into the tank penetrates through the filtration layer D to adsorb and remove the pesticide by the granular activated carbon, and the pesticide-removed water is the lower gravel layer C. Move in. On the other hand, the discharge pipe 300 is erected vertically with one pipe end opened in the small gravel layer C and the other end opened upward in the tank. Further, the middle of the discharge pipe 300 is horizontally branched and directly penetrates to the outside of the tank. The pipe end on the side penetrating the outside of the tank can be connected to the rainwater drain using a connecting pipe (not shown) or the like.

Further, the overflow pipe 400 is raised vertically upward from the middle of the horizontal portion of the discharge pipe 300 extending outside the tank, and the tip of the overflow pipe 400 is bent further horizontally to form the side surface 10.
A tube end is opened in the tank through 0b. In this way, the water that has reached the small gravel layer C is discharged through the discharge pipe 300 to the rainwater drain outside the tank. Also,
The overflow pipe 400 is branched from the middle of the discharge pipe 300,
Since the pipe end is opened upward in the tank, even if the drainage temporarily exceeds the drainage capacity of the rainwater culvert, the excess water is returned to the tank by the overflow pipe 400, so that backflow in the tank occurs. It won't happen. In addition, since the septic tank is downsized to a single tank type by using the glass fiber reinforced plastic (FRP) as in the above-mentioned configuration, it is possible to easily carry out factory production in a custom-made form. Furthermore, functional tests such as water flow or leak tests can be carefully performed in advance in the factory, and it is only necessary to install and bury the pesticide septic tank on site.

(Embodiment 3) In the present embodiment, a green drainage culvert of the underground structure for collecting green water having the construction of Embodiment 1 and an agricultural chemical septic tank having the construction of Embodiment 2 are connected to each other. I will explain the pesticide removal equipment. In the pesticide removal equipment of this embodiment, an underground structure for water collection having the configuration of the above-described Embodiment 1 is provided below the green. On the other hand, the pesticide septic tank having the configuration of the above-described Embodiment 2 is buried underground in a place slightly away from the green. The inflow pipe 200 of the pesticide septic tank and the trunk line 30 of the water collecting underdrain in the underground water collecting structure are connected using a connecting pipe.

Furthermore, the pipe end of the discharge pipe 300 of the pesticide septic tank, which is outside the tank, is connected to the rainwater drain through a connecting pipe. In this way, pesticides that have been sprayed on the green lawn can penetrate into the underground water collecting structure provided underground in the green as pesticide-contaminated water. The pesticide-contaminated water passes through the mixed sand layer B and reaches the single-grain crushed stone layer A. The pesticide-contaminated water penetrates into the permeation pipe of the branch line 30a of the water collecting underdrain buried in the single-grain crushed stone layer A, and is collected in the permeation pipe of the trunk line 30 of the water collecting underdrain. There is. The pesticide-contaminated water collected by the trunk line 30 of the underdrain for collecting water reaches the inside of the tank through the inflow pipe 200 of the pesticide purifying tank, and passes through the filtration layer D of granular activated carbon in the tank.

The pesticides in the pesticide-contaminated water are removed by granular activated carbon, and the water after the pesticide removal is transferred to the lower gravel layer C. The small gravel layer C is discharged through a discharge pipe 300 to a rainwater drain outside the tank. In this embodiment, the rainwater drain is also buried so that it is not exposed on the green surface. As you see from above the green,
It is shown in the plan view of FIG. In addition, the first embodiment,
The various sizes of the underground yard and the septic tank shown in 2 are merely examples, and various sizes can be set according to the site and the like. Also, although a permeation pipe was used as a culvert for collecting water,
Other than that, it is basically acceptable to use a perforated pipe or the like.

[0018]

EFFECT OF THE INVENTION By adopting the underground structure for collecting water of the present invention,
There is no need to excavate the bottom part of the underground yard in two steps, and it is sufficient to form the peripheral bottom surface uniformly on the inclined surface toward the deepest part at the center of the bottom part. Furthermore, if a branch line for the water collecting underdrain is provided along the inclined surface of the bottom, it is possible to quickly send the pesticide-contaminated water collected by the branch line to the trunk line of the water collecting underdrain laid in the deepest part without stagnation. it can. On the other hand, by configuring the pesticide septic tank as a single tank type, the septic tank itself can be downsized, and its installation and underground excavation for it can be done on a small scale, reducing the time and effort required for construction. Labor saving can be achieved. In addition, the pesticide removal equipment for green is constructed by connecting the water collecting underdrain of the underground structure for water collection with such a structure and the inflow pipe of the pesticide septic tank, and connecting the pipe end of the drainage pipe to the rainwater drain. If
It is possible to provide a pesticide purification facility for green which has a shorter construction period and a lower construction cost than before.

[Brief description of drawings]

FIG. 1 is a sectional view (a) of a green underground structure for collecting water according to the first embodiment and a sectional view (b) of a pesticide septic tank according to the second embodiment.

FIG. 2 is a plan view (a) showing a laying condition of a water collecting underdrain in the green water collecting underground structure according to the first embodiment, and a layout condition of the green pesticide removal equipment according to the third embodiment. The top view (b).

FIG. 3 is a cross-sectional view (a) of an underground structure for water collection of a conventional example, a plan view (b) showing a laying condition of an underdrain for water collection, and 2 of a conventional example.
Layer type pesticide septic tank (c).

[Explanation of symbols]

 10 Underground premises 11 Deepest part 12 Bottom surface 20 Water-impervious sheet 30 Water collecting underdrain trunk line 30a Water collecting underdrain branch line 100 Septic tank 200 Inflow pipe 300 Discharge pipe 400 Overflow pipe A Single-grain crushed stone layer B Mixed sand layer C Small gravel layer D Filtration layer

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location E02B 11/00 E03F 1/00 Z E02D 29/00 B01D 23/16 E03F 1/00 35/02 R

Claims (3)

[Claims] 1. A water collecting underdrain consisting of a trunk line and a branch line branching from the main line is laid at the bottom of an underground premises, the inside of which is covered with a water blocking sheet, and the water collecting underdrain is a single-grain crushed stone layer. In the underground water collecting structure of the green of the golf course which is buried and further has a mixed sand layer provided on the single-grain crushed stone layer, the bottom portion is formed with an inclined bottom surface toward the deepest part in the center of the bottom portion. In addition, the underground structure for collecting water of green is characterized in that the trunk line of the underdrain for collecting water is laid at the deepest part of the bottom part. 2. A pesticide-contaminated water from the collecting culvert is provided by providing an inflow pipe connected to the collecting culvert buried under the green of the golf course and an exhaust pipe connecting to an outside rainwater culvert. Pesticide is removed through the filter layer in the tank, in the pesticide septic tank for green to drain the water after the pesticide removal to the rainwater drainage, the pesticide septic tank, a small gravel layer is provided in the lower layer of the tank,
It consists of one septic tank in which a filtration layer of granular activated carbon is provided on the small gravel layer, and the septic tank is provided with an inflow pipe whose pipe end is open upward in the tank, and one pipe in the small gravel layer. A discharge pipe having an open end and the other pipe end opened to the outside of the tank was provided, and further, an overflow pipe having a pipe end branched upward from the middle of the discharge pipe was provided to the discharge pipe. A pesticide septic tank for green. 3. A bottom of an underground yard, which is provided under a green of a golf course and whose inside is covered with a waterproof sheet,
A single-layer crushed stone layer in the lower layer and a mixed sand layer in the upper layer are formed in two layers, and a catchment culvert consisting of a trunk line buried in the single-grain crushed stone layer and a branch line branching from it is a pesticide entering from the inflow pipe. In a pesticide removal facility for green, which is connected to the inflow pipe of a pesticide purification tank provided with a discharge pipe for draining water after removal of pesticide into a rainwater drain, while providing a filter layer for removing pesticides in contaminated water, The bottom of the underground yard is formed with an inclined bottom surface toward the deepest part in the center of the bottom, the trunk line of the water collecting underdrain is laid at the deepest part of the bottom part, and the agrochemical septic tank is a tank. A small gravel layer is provided in the lower layer inside,
It consists of one septic tank in which a filtration layer of granular activated carbon is provided on the small gravel layer, and the septic tank is provided with the inflow pipe whose pipe end is open upward in the tank, and in the small gravel layer. The discharge pipe is provided in which one pipe end is opened and the other pipe end is opened to the outside of the tank.The discharge pipe is branched from the middle of the discharge pipe to open the pipe end above the tank. Pesticide removal equipment for greens, which is equipped with a flooded overflow pipe.