JP4125066B2 - Ground drainage construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drainage structure for unpaved ground such as a ground or a park.
[0002]
[Prior art]
Conventionally, U-shaped grooves formed of porous concrete having water permeability have been widely used in drainage structures on unpaved ground such as grounds and parks. Examples of such U-shaped grooves include Japanese Utility Model Publication No. 50-44695, Japanese Utility Model Application Publication No. 51-137868, Japanese Utility Model Application Publication No. 52-48764, Japanese Utility Model Application Publication No. 57-71530, Japanese Patent Application Publication No. 59-27038. Japanese Patent Laid-Open No. 60-181434 and Japanese Patent Laid-Open No. 11-158982 are known. These U-shaped grooves are common in that water is sucked and drained from the ground on the side of the U-shaped groove to the U-shaped premises through the side surfaces or the bottom surface by configuring the side surface or the bottom surface with porous concrete. ing.
[0003]
FIG. 3 is a perspective sectional view showing an example of a ground drainage structure using a conventional U-shaped groove, and FIG. 4 is a diagram showing a drainage action of the ground drainage structure using a conventional U-shaped groove.
[0004]
In FIG. 3, the U-shaped groove 100 is constituted by a water permeable member having flat side walls 101 on both sides having a large number of minute holes, and the arcuate bottom portion 102 is constituted by impermeable concrete. By embedding such a U-shaped groove in the ground 103, as shown in FIG. 4, the water that has permeated the ground 103 passes through the side wall 101, flows into the U-shaped groove 100, flows on the bottom 102, and drains. Is done.
[0005]
[Problems to be solved by the invention]
However, in the above conventional ground drainage structure, when the water permeates the side wall 101 of the U-shaped groove 100 and the water flows into the U-shaped groove 100 from the ground, it is like clay floating in the water that permeates the side wall 101. The fine soil particles are trapped in the through-holes in the side wall 101, the through-holes are blocked, and the water permeability of the side wall 101 is lost at an early stage. In particular, when the size of the porosity of the side wall 101 is reduced, the side wall 101 is likely to be blocked and the water permeability is also lowered.
[0006]
On the other hand, if the porosity of the side wall 101 is increased in order to increase the water permeability of the side wall 101, the water permeability is improved and the side wall 101 is less likely to be blocked. 5 and flows into the inside of the side groove 100, and as shown in FIG. 5, the depressions 104 are formed on both sides of the side groove 100.
[0007]
The present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and the object of the present invention is to improve the drainage of underground water in a ground drainage structure having a water-permeable side wall, It is an object of the present invention to provide a ground drainage structure that is less likely to block a through hole in a side wall of a groove and that can prevent soil from flowing out of the ground around the drainage groove.
[0008]
Another object of the present invention is to provide a drainage structure on the ground that can be easily integrated into the surrounding landscape, can prevent the destruction of the landscape, is easy to construct, and is low in construction cost.
[0009]
Still another object is to provide a method for constructing the ground drainage structure that can minimize the discharge of residual soil, is easy to construct, and is low in construction cost.
[0010]
[Means for Solving the Problems]
In short, the first configuration of the ground drainage structure according to the present invention includes a drainage groove formed of a porous member having at least one side having water permeability, and a side portion of a side surface formed of the porous member of the drainage groove. An aggregated soil layer placed in close contact with the aggregated soil layer, the aggregated soil layer is formed by kneading natural soil and an aggregating agent , and is characterized in Rukoto which have a surface having the same height as closely and the ground surface on the entire surface and adjacent ground of said side. With this configuration, the following effects can be obtained.
[0011]
First, the agglomerated soil layer is agglomerated by kneading natural soil and an aggregating agent, so the porosity is larger than that of natural soil, and the coarse pores between the agglomerated soil particles. The structure is formed. That is, since the aggregating agent is composed of a polymer compound in which each molecule has a strong positive charge, by mixing it into the soil, soil particles having a polarity opposite to the charge possessed by the aggregating agent and The aggregating agent is instantly bonded, and these particles are bonded to each other to form an aggregate (aggregate), and these aggregates are connected and crosslinked to form a three-dimensional network structure. Yes. Therefore, the three-dimensional network structure formed in this way exhibits excellent strength, stability, and sustainability, and also exhibits high permeability. Therefore, the rainwater dripped onto the ground during the rain quickly penetrates into the aggregated soil layer. In addition, the coarse pores inside the agglomerated soil layer are fine enough to filter and adsorb minute soil particles and dust floating in the rainwater column. And filtered in the aggregated soil layer. Thereafter, the rainwater passes through the drainage groove side surface formed by the porous member, flows into the drainage groove, and is drained through the drainage groove. In this way, the drainage groove formed by the porous member after the granulated soil layer becomes a filter and the rainwater is once filtered through the aggregated soil layer to remove fine soil particles and dust, etc. Since it passes through the side surface, it is possible to prevent the drainage groove side surface formed by the porous member from being blocked by these fine soil particles, dust, and the like.
In addition, the aggregated soil layer has a structure in which soil particles of natural soil form aggregates with the aggregated agent as a binder, and these aggregates are connected and crosslinked to form a three-dimensional network structure. Have. Accordingly, the aggregate structure of the aggregated soil layer is prevented from being destroyed by raindrops, and crust (soil film) is prevented from being formed on the surface of the aggregated soil layer. Thereby, the water permeability of the aggregated soil layer does not decrease over a long period of time, and the aggregated soil layer can serve as a filter for a long period of time.
In addition, the aggregated soil layer is a natural soil that has been aggregated with an aggregating agent, so it is difficult to distinguish it from the surrounding natural soil and it is easy to blend into the surrounding landscape. The destruction of the landscape is also prevented by placing drainage structures.
Moreover, if natural soil is a sandy system, it can be used as a material as it is and there is no need to dispose of it, so there is no cost for residual soil treatment, and construction costs for drainage grooves are reduced.
[0012]
Here, the “porous member having water permeability” refers to a member having a large number of continuous pores and having a property of allowing water to pass through the pores. For example, porous concrete, rubber chips and the like are used. The The shape of the "drainage" is not particularly specified. U-shaped groove, V-shaped groove, long U-shaped groove, CH variable drainage groove, MC variable drainage groove, SR drainage groove, dish-shaped drainage groove, underdrain pipe, etc. Is used. “Aggregating agent” refers to an additive that promotes the formation and maintenance of soil agglomerates. Examples of aggregating agents include magnesium salt of acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneimine. A polymer compound composed of the above composite is used. More specifically, for example, trade names “Chemical Buoy”, “GB-2000”, “CG-2000”, etc., manufactured by Global Laboratories, Inc. are used. The porosity of the aggregated soil layer is not particularly specified, but the porosity of the aggregated soil layer is preferably 5 to 15% by volume. When the porosity is less than 5% by volume, the water permeability is lowered, rainwater cannot sufficiently pass through the agglomerated soil layer, drainage performance is lowered, and the porosity is 15 If the volume percentage is larger than the volume%, the pores between the aggregates of the soil particles of the aggregated soil layer become wider, the aggregated soil layer cannot fully function as a filter, and the sidewall of the drainage ditch is fine soil. This is because clogging easily occurs due to particles or the like. The mixing ratio of the natural soil and the crumb agent, when using GB-2000 as a crumb agent, to obtain a good moderate porosity to water permeability, with respect to the natural soil 1 m ³ Thus, it is preferable to add the aggregating agent at a rate of 2 to 4 liters. The kneading of the natural soil and the aggregating agent is performed by kneading the soil, the aggregating agent and water with a mixer, a tractor or the like. The water ratio at this time is such that the water content of natural soil is measured and the water content after kneading is 15% or less.
[0013]
According to a second configuration of the ground drainage structure of the present invention, in the first configuration, the aggregating agent is a composite of a magnesium salt of acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneimine. It is a high molecular compound consisting of a body.
[0014]
With this configuration, the aggregating agent is composed of a polymer compound in which each molecule has a strong positive charge. Therefore, when this is mixed into the soil, the soil has a polarity opposite to the charge of the aggregating agent. The particles are instantaneously combined with each other, and these particles are combined to form an aggregate. Further, these aggregates are connected and crosslinked to form a three-dimensional network structure. Therefore, the three-dimensional network structure of soil particles formed in this way exhibits excellent strength, stability, and sustainability, and also exhibits high permeability.
[0015]
The third configuration of the drainage structure of the ground of the present invention, in the structure above the first or 2, wherein the group granulation process soil layers, to the natural soil 1 m ^3, the cement 20 to 100kg and crumb of It is characterized by mixing 2 to 4 liters of agent.
[0016]
By placing a mixture obtained by kneading natural soil, cement, and an aggregating agent at the above mixing ratio, the porosity of the agglomerated soil layer becomes approximately 5 to 15% by volume. Therefore, the water permeability of the aggregated soil layer is sufficiently maintained, and the function of the aggregated soil layer as a filter is sufficiently exhibited.
[0017]
Moreover, the 4th structure of the drainage structure of the ground of this invention is the structure of any one of said 1st thru | or 3 WHEREIN: The said natural soil is the soil of the construction site which lays the said aggregated soil layer. It is characterized by being.
[0018]
With this configuration, since the soil at the construction site is used for the agglomerated soil layer, the appearance of the agglomerated soil layer after placement is almost the same as the natural soil around the construction site, The landscape is prevented from being disturbed by the drainage structure. Moreover, since the soil discharged by excavating the ground can be used as it is when the aggregated soil layer is placed, the amount of discharged residual soil is small, and the labor and cost of the residual soil treatment can be reduced. Further, since no separate natural soil is required, the construction cost of the drainage structure is reduced, and the transportation of the natural soil is not required, so that the construction of the drainage structure becomes extremely easy.
[0019]
Further, the ground drainage construction method of the present invention includes a drilling step for excavating a groove for laying the drainage structure on the ground on which drainage is performed, and at least one side surface of the trench excavated in the excavation step is porous. Drainage groove laying process for laying drainage grooves formed by members, a kneading process for adding a kneading agent to natural soil discharged by excavation in the excavation process, kneading and agglomerating, and By placing the natural soil agglomerated in the kneading step on the side portion of the side surface formed by the porous member, it is in close contact with the entire surface of the side portion and the adjacent ground, and the same height as the surface of the ground. And a treated soil layer placing step for forming an agglomerated treated soil layer having a surface .
[0020]
With this configuration, it is possible to construct a ground drainage structure that prevents the drainage groove side portion from being clogged with fine soil particles and dust, and can exhibit drainage performance over a long period of time. In addition, the aggregated soil layer is formed by mixing the aggregating agent with the natural soil discharged for laying the drainage structure by the excavation process, and forming the aggregated soil layer. It will have the same appearance as the local soil and will not disturb the landscape. Furthermore, since the soil discharged by excavating the ground can be used as it is when the aggregated soil layer is placed, the amount of discharged residual soil is small, and the labor and cost of the residual soil treatment can be reduced. In addition, since no separate natural soil is required, the construction cost of the drainage structure is reduced and the transportation of the natural soil is not required, and the construction of the drainage structure becomes extremely easy.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a perspective sectional view of a ground drainage structure according to Embodiment 1 of the present invention.
In FIG. 1, the drainage structure 1 on the ground includes a drainage groove 2 in which one side surface 2 a is formed of a water-permeable porous member, and aggregates placed in close contact with a side portion of the side surface 2 a of the drainage groove 2. It has a chemical treatment soil layer 3. Further, a non-land adjustment layer 4 made of mortar or crusher run is placed under the drainage groove 2. The drainage groove 2 is a U-shaped groove having a cross-sectionally U-shaped cross section, the side surface 2a is made of porous concrete, and the side surface 2b opposite to the side surface 2a and the bottom surface 2c are impermeable ready mixes. It is made of concrete. The aggregated soil layer 3 is formed by kneading natural soil, cement, and an aggregating agent that are the same as the soil constituting the ground 5 around the ground drainage structure 1. As the aggregating agent, “GB-2000” manufactured by Global Research Laboratories is used. This “GB-2000” is a polymer compound composed of a complex of a magnesium salt of acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneimine, and a chain-like organic polymer having a very long molecular length is a helix. Is a polymer compound having a molecular structure. In this polymer compound, each molecule has a strong positive charge. When this molecule is mixed with soil or cement, it binds to soil particles or cement particles having negative charges to form aggregates (aggregates). . Further, the aggregating agent connects and crosslinks these aggregates to form a three-dimensional network aggregate. Therefore, such aggregates are excellent in strength, stability, and sustainability, and the aggregate structure is not easily destroyed even by raindrops, and crusts (soil films) are prevented from being generated. Moreover, since the aggregated soil layer 3 has a network structure having coarse pores, it is excellent in water permeability and easily absorbs and permeates water in the surrounding ground 5.
[0022]
The drainage action of the ground drainage structure of the present embodiment configured as described above will be described below.
[0023]
FIG. 2 is a diagram showing the movement of water near the ground drainage structure during rainfall.
During rain, etc., water flows from the surface of the ground 5 to the drainage ditch 2 and is drained. A part of the water is drained when flowing on the surface of the agglomerated soil layer 3. And is drained to the inside of the drainage groove 2 through the side wall 2 a of the drainage groove 2. Further, rainwater that has penetrated into the ground 5 flows into the aggregated soil layer 3 from the ground 5 and drains into the drainage groove 2 through the side wall 2 a of the drainage groove 2. Thus, before rainwater passes through the side wall 2a of the drainage groove 2, it always passes through the aggregated soil layer 3. Therefore, when rainwater passes through the agglomerated soil layer 3, fine soil particles such as clay particles floating in the rainwater are captured inside the agglomerated soil layer 3, and the filtered rainwater is drained into the drainage ditch. Therefore, it is possible to avoid a situation where the through holes in the side wall 2a are blocked by fine soil particles. In addition, the soil particles in the aggregated soil layer 3 are aggregated by an aggregating agent and are further firmly bonded with cement as a binder, so that the aggregates are easily broken by raindrops. Will never be done. Accordingly, the soil of the agglomeration treatment layer 3 does not flow into the drainage ditch 2 due to rainwater, and the drainage performance is improved by using porous concrete having a relatively large porosity on the side wall 2a of the drainage ditch 2. It is possible to make it. Moreover, possibility that the side wall 2a will block | close is reduced by using porous concrete with a large porosity.
Moreover, since rainwater flows into the side groove after being filtered by the aggregated layer 3, it can be reduced that muddy water flows into the side groove.
[0024]
Next, the construction method of the ground drainage structure in the present embodiment will be described.
In the construction, first, the ground 5 is excavated, and a groove for placing the drainage groove 2 and the aggregated soil layer 3 is formed in the ground 5. Next, in order to lay the drainage groove 2 horizontally, a mortar or a crusher run is placed to form the unevenness adjusting layer 4. Then, the drainage groove 2 is laid in the upper part of the uneven adjustment layer 4 with U-shaped grooves arranged.
[0025]
On the other hand, 20 to 100 kg of cement and 2 to 4 liters of an aggregating agent are added to 1 m ³ of soil generated when the ground 5 is excavated, and they are kneaded by a mixer to be aggregated. Then, this aggregated soil is placed on the side of the side wall 2a of the drainage groove 2 and solidified. Thereby, the porosity of the agglomerated soil layer 3 is 5 to 15% by volume, and the agglomerated soil layer 3 that is excellent in water permeability and excellent in capturing of fine soil particles is formed. .
[0026]
【The invention's effect】
As described above, according to the first configuration of the ground drainage structure of the present invention, the water flowing through the side surface formed by the porous member of the drainage groove and flowing into the drainage groove is agglomerated treated soil. Since it is filtered by the layer, it is possible to provide a ground drainage structure in which the drainage groove side portion is prevented from being clogged with fine soil particles and dust and can exhibit drainage performance over a long period of time.
[0027]
Moreover, according to the 2nd structure of the ground drainage structure of this invention, since the aggregated process soil layer excellent in intensity | strength, stability, and sustainability can be formed, drainage performance is demonstrated over a long period of time. A ground drainage structure that can be provided.
[0028]
Further, according to the third configuration of the ground drainage structure of the present invention, the water permeability of the aggregated soil layer is sufficiently maintained, and the function of the aggregated soil layer as a filter is sufficient. Therefore, it is possible to provide a ground drainage structure that can exhibit drainage performance over a long period of time.
[0029]
Moreover, according to the 4th structure of the ground drainage structure of this invention, a landscape drainage structure is not disturbed by construction of a drainage structure, and the ground drainage structure with easy construction and low construction cost can be provided.
[0030]
According to the construction method of the ground drainage structure of the present invention, the drainage groove side portion is prevented from being clogged with fine soil particles and dust, and the ground drainage construction method can exhibit drainage performance over a long period of time. Can be provided. Moreover, the construction of the drainage structure does not disturb the landscape by the construction of the drainage structure, and the construction is easy and the construction cost is low.
[Brief description of the drawings]
FIG. 1 is a perspective sectional view of a ground drainage structure according to a first embodiment of the present invention.
FIG. 2 is a diagram showing the movement of water near the ground drainage structure during rainfall.
FIG. 3 is a perspective sectional view showing an example of a ground drainage structure using a conventional U-shaped groove.
FIG. 4 is a view showing a drainage action of a ground drainage structure using a conventional U-shaped groove.
FIG. 5 is a diagram for explaining a ground depression phenomenon around a U-shaped groove in a conventional ground drainage structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ground drainage structure 2 Drainage groove 2a, 2b Side surface 2c Bottom surface 3 Aggregation process soil layer 4 Uneven adjustment layer 5 Ground 100 U-shaped groove 101 Side wall 102 Bottom part 103 Ground

Claims (1)

An excavation process for excavating a groove for laying a drainage structure on the ground for draining;
Drainage groove laying step of laying a drainage groove formed of a porous member having at least one side surface permeable to the groove excavated in the excavation step;
A kneading step of adding a kneading agent to natural soil discharged by excavation in the excavation step and kneading to knead;
By placing the natural soil agglomerated in the kneading step on the side part of the side surface formed by the porous member of the drainage groove, the surface of the ground is in close contact with the entire surface of the side part and the adjacent ground. A treated soil layer casting step for forming a flocculated treated soil layer having a surface having the same height as
A method for constructing a ground drainage structure, characterized by comprising:

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