JP3497955B2 - Drainage structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage structure, and more particularly, to a drainage structure constructed underground for drainage at a golf course, a playground or the like, or for improvement work or reclamation work on soft ground, Placed inside the ground or embankment in order to effectively drain or drain pore water and rainwater in soil during levee work to promote or maintain soil consolidation and stabilize the soil. The present invention relates to a drainage structure which is light in weight and is made of a constituent material excellent in water permeability, breathability and bendability and which has excellent workability.

[0002]

2. Description of the Related Art For example, on a golf course or a playground,
If rainwater or the like collects on the ground surface, it becomes difficult to use it. Therefore, it is necessary to improve drainage on the ground surface. For this reason, it is necessary to form a drainage structure for smoothly draining rainwater and the like in the ground to promote drainage on the ground surface and restore the usable state in the shortest possible time.

Generally, land reclamation works, road works,
When carrying out embankment work, etc., a drainage structure is often formed in the ground or embankment where the work is carried out so that the ground will not become unstable and the retaining wall will be damaged by the infiltration of rainwater. .

Further, for example, in a road gutter, if rainwater or the like flowing into the gutter from the asphalt surface is not drained at a plurality of points in the gutter, the water will overflow from the gutter, so that the bottom surface of the gutter is substantially vertical. It is necessary to form a drainage structure in the direction to guide and drain the rainwater that has flowed into the gutter to a desired location.

Further, in the constructed land, since the ground may loosen due to excessive pore water to cause landslides, it is necessary to form a drainage structure in the ground to drain rainwater and the pore water. .

[0006] Furthermore, when road construction or embankment work is performed on the soil containing pore water as it is, the pore water contained in the soil is, for example, for several years, due to the load of these roads or levees. The gradual release over decades of time can cause soil compaction and serious problems. Therefore, when performing the above-mentioned construction on the soil containing pore water, a drainage structure that can forcibly discharge the pore water in the soil is formed to promote consolidation of the soil and stabilize the soil. After the conversion treatment, it is necessary to start the laying work of asphalt and the construction of the retaining wall.

As the above-mentioned drainage structure that has been conventionally adopted,
As shown in FIG. 14, a plurality of perforated pipes 20 each having a diameter of about 300 to 1000 mm are connected and buried in a substantially vertical direction in the ground,
A drainage structure in which the perforated pipe 20 is surrounded by crushed stones 30 has been adopted. The perforated pipe 20 is a pipe made of, for example, a hard vinyl chloride having a large number of holes 21 on its surface. By burying a connected body of the perforated pipes 20 in the ground, excess water in the ground can be removed. From the hole 21 of the perforated pipe 20 to the perforated pipe 2
The water is collected in 0, and the collected water is guided to the lower end of the connected body of the perforated pipe 20, and is mainly discharged from the open end of the lower end of the perforated pipe 20. The above-mentioned crushed stone 30 surrounding the perforated pipe 20 is arranged to prevent the holes 21 of the perforated pipe 20 from being clogged with mud or the like.

The operation of burying the perforated pipe 20 in the ground is as follows: when the perforated pipe 20 is sequentially buried at the time of landfill or at the embankment, or when it is buried in the field board,
First, a hole having a predetermined depth and a predetermined diameter is formed at a planned standing position, and a connected body of the perforated pipe 20 is set up in the hole. At this time, the diameter of the hole is made sufficiently larger than the diameter of the perforated pipe 20 (about 300 to 1000 mm), and the perforated pipe 2 is formed substantially at the center of this hole.
After erected the connection body of 0, the crushed stone 30 is put in the hole around the connection body to bury the perforated pipe 20. At this time,
In order to form the above-mentioned connected body of the perforated pipes 20, a plurality of perforated pipes 20 are connected by a joint 22. Joint 22
There are various shapes, but most of them are perforated tubes 20.
Like, for example, it is made of hard vinyl chloride.

[0009]

As described above, the conventional plurality of perforated pipes are connected by joints, the connected body is buried in the ground, and crushed stones are arranged around the perforated pipes. The drainage structure is poor in bendability because it also improves durability, strength against external pressure, mechanical strength, etc. Therefore, when forming this drainage structure, the angle of holes formed in the ground is also strict. Was required, and there was a problem that work efficiency was inferior.

In addition, the holes of the perforated pipe around the perforated pipe are clogged with mud and the like, so that the opening ratio is lowered and the water collecting function as the drainage structure is extremely lowered. In order to prevent it, it is necessary to dispose crushed stones, which complicates the work process and increases the cost.

The present invention has been made in view of the above problems and is lightweight, has good workability during construction, is excellent in water permeability and breathability, and has a drastically reduced water collecting function due to clogging by mud or the like. It is an object of the present invention to provide a drainage structure that uses a component material that is rich in bendability.

[0012]

In order to achieve the above object, a drainage structure according to the present invention is provided in a water-permeable bag-shaped body.
A plurality of lightweight embedding materials filled with a predetermined filling rate of a light weight filler made of a synthetic resin foam formed by molding an expandable synthetic resin are connected to each other in a substantially vertical direction in the ground and are continuously connected. Embedded in the ground, and at least one of the connecting portions of the plurality of lightweight embedding materials has a flat area wider than the cross-sectional area of the connecting portions in the direction intersecting the continuous direction of the lightweight embedding materials. It is characterized in that a water-permeable sheet body having an area is interposed.

Here, in the sheet body, a plurality of lightweight embedding materials embedded in the ground are prevented from temporarily floating due to a large buoyancy generated by a large amount of water existing around due to some reason such as rain. It is for doing. Therefore, the sheet body is more preferably made of a non-woven fabric in order to obtain its function, and it is more effective to prevent floating when the area is large as long as the workability is not hindered. Further, it is preferable that the lightweight embedding material is a foam molded body molded into a substantially spherical shape.

[0014]

DETAILED DESCRIPTION OF THE INVENTION

<First Embodiment> FIG. 1 is a schematic partial sectional view showing a drainage structure according to a first embodiment of the present invention, and FIG. 2 shows an example of a lightweight embedding material used in this drainage structure. It is a typical perspective view.

Reference numeral 1 in the drawing shows a lightweight embedding material which is a constituent material of the drainage structure according to the first embodiment.
The light-filling material 3 is filled inside the water-permeable bag-like body 2 and the ends thereof are tied together by the cord body 4a (FIG. 2). The lightweight embedding material 1 is, for example, continuously embedded in the ground in the length direction thereof, and at least one of the connecting portions of the plurality of lightweight embedding materials 1, that is, the end of the lightweight embedding material 1 A sheet body 5 is interposed in at least one position between the portions 1a in a direction intersecting with the continuous direction of the lightweight embedding material 1. The sheet body 5 is water-permeable and has a plane area larger than the cross-sectional area of the connecting portion. Although not shown, at the connecting portion of the light-weight embedding material 1 in which the sheet body 5 is interposed, the end portions 1a of the light-weight embedding material 1 are abutted against each other.
The sheet body 5 and the sheet body 5 may be connected to each other by some form.

The following method can be considered as a method of constructing the drainage structure shown in the figure. For example, when forming a land with a drainage structure, the lightweight embedding material 1 is first erected on the ground in advance, and the single lightweight embedding material 1 is provided around the erected lightweight embedding material 1. After embedding the lightweight embedding material 1 by disposing the embankment (first embankment) having the same height as the embedding height of the embedding material 1 on the ground, the exposed end portion 1 of the lightweight embedding material 1
A sheet body 5 is arranged on the surface of the first embankment so as to cover a, and the sheet body 5 is placed on the end portion 1a of the lightweight embedding material 1 embedded in the first embankment via the sheet body 5. The light-weight embedding material 1 is erected. Then, after embedding the next lightweight embedding material 1 by arranging the embankment (second embankment) having the same height as the embedding height around the next lightweight embedding material 1, after that, similarly, one after another. Then, the lightweight embedding material 1 and the sheet body 5 are embedded, and finally a drainage structure in which a plurality of the lightweight embedding materials 1 are continuous is formed.

The method is not limited to the above method, and the following method can be considered. First, an embankment (first embankment) having the same height as the embedding height of the single lightweight embedding material 1 is arranged on the ground, and then the lightweight embedding material 1 is placed at a predetermined location on the arranged first embankment. An embedding hole is formed, and the lightweight embedding material 1 is embedded in this hole. Next, the sheet body 5 is formed on the surface of the first embankment so as to cover the exposed end portion 1a of the lightweight embedding material 1.
Is placed on the first embankment including the upper surface of the sheet body 5, and the embankment (second embankment) having the same height as the embedding height of the lightweight embedding material 1 is arranged. The light-weight embedding material 1 and the sheet body 5 are embedded one after another to finally form a drainage structure in which a plurality of light-weight embedding materials 1 are continuous.

The shape of the lightweight embedding material 1 described above, in other words, the size of the bag-shaped body 2 can be appropriately set according to the purpose of use, but generally, it is a cylindrical shape as shown in the drawing. The diameter D is about 200 to 1500 mm, preferably 350 to 400 mm, and the length L ₁ is 400 to 3000.
A size of about mm, preferably about 500 to 2000 mm, which a person can hold alone, is preferable from the viewpoint of workability and the like.

The filling rate of the lightweight filler 3 into the bag-like body 2 is not particularly limited, but considering shape conformability to the construction site and the like, it is not preferable to pack it too much, and it is possible to deform, that is, 90 to the capacity of the bag 2
The filling rate is preferably about 95%. As for the material of the bag-shaped body 2, as long as it has water permeability and the lightweight filler 3 filled inside does not spill,
There is no particular limitation. For example, natural fibers such as hemp, synthetic fibers such as polypropylene, nylon, polyvinyl chloride, and polyester, as well as knitted or woven fabrics made of various fibers such as those obtained by blending them, cloth-like materials such as non-woven fabrics, or net-like materials. Is mentioned. Examples of the non-woven fabric include mantle (manufactured by Toray Industries, Inc.) and the like. Further, a wire net made of wire such as aluminum or iron can also be used, and a wire net conventionally used with crushed stone or the like is also preferable. Further, when a bag-like material or a net-like material is made of a synthetic resin such as polypropylene, it is chemically stable and can withstand long-term use sufficiently. For example, a bag-shaped body made of a net made of synthetic fiber, which is generally used for carrying and storing onions, a bag-shaped body made of a net made of a thicker material, and a net made of a thicker material. A bag-shaped body using a product is also preferable. Further, a combination of a natural fiber such as hemp and a synthetic fiber such as polypropylene, or a combination of a wire mesh is also preferable.

In order to form the bag-like body 2, for example, a mesh-like body formed into a continuous long tubular shape is cut into an appropriate length, and the lightweight filler 3 is filled into the inside to open both ends. The string 4
It may be tied or sealed with a, etc., or as shown in FIG. 3 (a), a tightening string 4a may be provided in advance in the opening portion, or as shown in FIG. 3 (b), lightweight filling. Before filling the material 3, one opening may be attached in advance.

Further, inside the lightweight embedding material 1, as shown in FIG.
If the pipe 6 made of vinyl chloride resin or the like is internally provided as shown in Fig. 1, the water permeability can be more reliably ensured and the water collected in the lightweight embedding material 1 can be smoothly conducted. be able to.

Next, the lightweight filler 3 filled in the bag-shaped body 2 as described above will be described. This lightweight filler 3
Is made of, for example, a synthetic resin foam obtained by molding a foamable synthetic resin. The type of this resin is not particularly limited, but various types such as polystyrene, polyethylene, polypropylene, or other polyophine, ABS, MBS, polyethylene terephthalate, etc., which have been generally used as raw materials for synthetic resin foams, have been used. Of these, polystyrene is preferred because of its high compressive strength and ease of molding. Polyolefin is preferable when chemical resistance against acids, alkalis, solvents and the like is required. The lightweight filler 3 is formed by using, for example, the expandable beads of synthetic resin as described above as a raw material by an in-mold foam molding method. Further, the lightweight filler 3 is not limited to a molded body molded into any prescribed shape, and may be a crushed product obtained by crushing this molded body.

The expandable beads for molding the filler include
From the viewpoint of imparting flame retardancy, it is preferable to include a flame retardant. This is because considering the danger of fire and the like, the above-mentioned consideration is desired from the viewpoint of safety during storage.

Examples of the flame retardant used in the present invention include halogen flame retardants, phosphorus flame retardants, inorganic flame retardants and the like.
Examples of the halogen-based flame retardant include chlorinated paraffin,
Chlorinated polyethylene perchloropentacyclodecane, hexabromobenzene, decabromodiphenyl oxide, tetrabromobisphenol A, hexabromocyclododecane and the like can be mentioned. Examples of phosphorus-based flame retardants include non-halogenated compounds such as triphenyl phosphate, tricresyl phosphate, tricresyl diphenyl phosphate; halogen-containing compounds such as tris (halopropyl) phosphate and tris (haloethyl) phosphate. . Examples of the inorganic flame retardant include halogen-containing compounds such as ammonium bromide; non-halogen-containing compounds such as antimony trioxide, antimonate barium metaborate, zinc borate, borax, zirconium oxide and aluminum hydroxide.

Among these, halogen-based flame retardants having a high flame retarding effect are preferable, and bromine-based flame retardants such as hexabromobenzene, decabromodiphenyl oxide, tetrabromobisphenol A, and hexabromocyclododecane are particularly preferable.

The content of the flame retardant in the expandable synthetic resin is preferably 0.5 to 3% by weight, more preferably 0.
It is 7 to 1.5% by weight. When the content of the flame retardant is less than 0.5% by weight, the foamable synthetic resin cannot have a sufficient flame retardant effect. On the contrary, when it exceeds 3% by weight, the foamable synthetic resin is decomposed by decomposition of the flame retardant. Resin deterioration cannot be prevented sufficiently.

The foamable synthetic resin of the present invention may further contain other usual additives such as a colorant and an ultraviolet protective agent.

Lightweight filler 3 made of this synthetic resin molding
Has a diameter D of 40 to 20 as shown in FIG.
It is formed into a nearly spherical shape when it is about 0 mm. The light weight filler 3 is formed to have a diameter of 40 mm or more, and when filled in the bag-shaped body 2 to form the embedding medium 1, the porosity is sufficient to ensure water permeability and air permeability. Strength can be obtained. Although the upper limit of the diameter of the lightweight filler 3 is not particularly limited,
If it is too large, unevenness on the surface of the bag-shaped body 2 becomes large when the bag-shaped body 2 is filled, and the cooling efficiency at the time of foam-molding the filler also decreases. preferable. The diameter of the lightweight filler 3 is more preferably about 50 to 110 mm, and is preferably about 70 mm in consideration of productivity during in-mold foam molding. The expansion ratio of the lightweight filler 3 cannot be generally determined because the required strength varies depending on the purpose of use, but in the usual case, it is appropriately set in the range of about 30 to 80 times. For example, when it is used for a drainage structure at the time of embankment work, since it does not require so much strength, it is foam-molded at a relatively high magnification of about 50 to 80 times, and the compression strength at that time is 0.5 to 1. It is preferable that the molded product has a density of about 3 kgf / cm ² and a molded product density of about 0.02 to 0.012 g / cc. On the other hand, when it is used as a drainage structure for road embankment that requires high strength, it has a relatively low foaming ratio of about 30 to 50 times, and the compressive strength in that case is 1.3 to
About 2.4 kgf / cm ² , molded product density is 0.033-0.0
About 20 g / cc is preferable, and use of such a foaming ratio is suitable because it can sufficiently withstand use under severe conditions such as heavy machinery such as heavy machinery for civil engineering running.

The shape of the lightweight filler 3 is not limited to any particular shape. For example, as shown in FIG. 6, if a single or a plurality of grooves 7 are formed on the peripheral surface of the lightweight filler 3, the lightweight filler 3 is formed. When the bag-shaped body 2 is filled with water,
A sufficient space for ventilation can be secured. Further, as shown in FIG. 7, if a single or a plurality of through holes 8 are provided penetrating the lightweight filler 3, as in the case of the groove 7, the bag-like body 2 is provided with water permeability and ventilation. This is preferable because not only the space can be surely secured but also the cooling efficiency when foaming the lightweight filler 3 is good and the productivity is improved. Further, as shown in FIG. 8, by forming the peripheral surface of the lightweight filler 3 into a polyhedral shape, the water permeability of the embedding material 1,
It can also ensure breathability. Also, although not shown,
From the viewpoint of water permeability and air permeability, various irregularities may be provided on the surface of the lightweight filler 3. It is needless to say that the lightweight filler 3 may be formed by appropriately combining the groove 7, the through hole 8 or the polyhedral shape as described above.

By the way, it is preferable that the sheet body 5 to be interposed in at least one of the connecting portions of the plurality of lightweight embedding materials 1 has a plane area larger than the cross-sectional area of the connecting portions. The widthwise dimension of the sheet body is preferably in the range of 0.5 to 5 m, more preferably about 1 to 2 m.
The lengthwise dimension of the sheet body 5 is not limited in any way. For example, when a sheet body wound in a roll shape in the lengthwise direction is used, it can be appropriately cut into a desired length before use. . The longer the dimension in the lengthwise direction is, the more the effect of interposing the sheet body 5 can be enhanced, but it is preferably about 30 m from the viewpoint of easy handling. In some cases, the sheet body 5 is laid in a cross shape with the connecting portion as a center and is interposed.

The thickness of the sheet body 5 is preferably, for example, in the range of 1 to 20 mm, more preferably 3 to 5 mm. When the thickness of the sheet body 5 is extremely thin, the water absorption may be poor. It is preferable that the sheet body 5 is used, for example, by rolling a roll body and appropriately cutting it into a desired length.

A non-woven fabric is mentioned as a preferred example of the sheet body 5, and one example of the non-woven fabric is mantle (manufactured by Toray Industries, Inc.) as in the case of the bag-shaped body 2. When a non-woven fabric such as the mantle is used as the sheet body 5, since the non-woven fabric is made of continuous polyester filaments having a continuous laminated structure, mechanical strength, dimensional stability, heat resistance and weather resistance are obtained. The sheet body 5 having excellent corrosion resistance can be obtained, and since the adhesive is not used for joining the fibers, the water permeability and the filter performance can be improved.

The sheet body 5 as described above may be interposed in at least one of the connecting portions of the plurality of lightweight embedding materials 1 in the drainage structure, and may be inserted in all the connecting portions. Good, it may be inserted in a plurality of places of the connection portion, or may be inserted in one place of the connection portion. When it is installed at the above-mentioned one location, it is preferably installed at the connecting portion located above the drainage structure. Further, these sheet bodies 5 are preferably interposed in a direction intersecting the continuous direction of the lightweight embedding material.

An example of construction of the drainage structure thus constructed will be described below. FIG. 9 shows a drainage structure provided for efficient drainage of rainwater when road pavement work is performed on a slope of a mountain.
For example, a light-weight embedding material 1 for drainage (hereinafter, simply referred to as embedding material 1) and the like are arranged in a substantially vertical direction in the ground in the lower portion, for example, facing a part of the lower surface of the gutter 9a. Conventionally, perforated tube 2
The connection body of 0 (FIG. 14) was erected, the person carried the crushed stone 30 by a unicycle, etc., and put it around the perforated pipe, but in the case of the drainage structure according to the present invention, Not only is it unnecessary to use crushed stones 30, but it is also extremely lightweight, and because it is filled in the bag-shaped body 2, it is easy to handle.
Since the lightweight filling material 3 is filled at an appropriate filling rate, the embedding material 1 that is rich in bendability and water permeability can be used as the constituent material, and the work efficiency during construction can be significantly improved. .

Here, since the lightweight filler 3 in the embedding material 1 is extremely lightweight, when rainwater permeates into the embedding material 1, the lightweight filler 3 floats up due to buoyancy and the embedding material 1
There is a possibility that the sheet body will float up and the entire drainage structure will rise upwards. However, at least one of the connecting portions of the embedding material 1 has the sheet body 5 interposed, and the sheet body 5 Since the flat area is wider than the cross-sectional area of the embedding material 1, the portion protruding from between the embedding material end portions 1a of the sheet body 5 is fixed in the ground, so that the sheet body 5 is lowered from this sheet body 5. The embedding material 1 located at is suppressed from rising and is held at the position at the time of standing. Therefore, it is possible to prevent the displacement of the drainage structure from occurring.

In the first embodiment, the case where the drainage structure is formed on a part of the lower surface of the side groove 9a has been described (FIG. 9), but the present invention is not limited to this and, for example, regardless of the presence or absence of the side groove 9a. It may be formed substantially vertically downward at a predetermined location on the road. Further, this drainage structure is not limited to a structure formed by a series of connecting bodies of the embedding material 1, and may be a structure in which a plurality of the connecting bodies are arranged in a substantially vertical direction in the ground.

In the above-mentioned first embodiment, the drainage structure in which the embedding materials 1 are connected by simply abutting the ends 1a thereof has been shown, but the invention is not limited to this. For example, the end 1a of the embedding material 1 facing each other
They may be connected by being covered with a cloth body. This case will be described in the second embodiment below.

<Second Embodiment> A drainage structure according to the second embodiment will be described with reference to the schematic sectional view shown in FIG. Of the continuous portion of the embedding material 1, at the location where the sheet body 5 is not interposed, the end portions 1a of the embedding material 1 are covered by the connecting cloth body 10 in a state of being abutted against each other. Other configurations are similar to those of the first embodiment, and the same reference numerals are given to the components having the same functions as those of the first embodiment.

Connecting cloth body 1 of the drainage structure shown in FIG.
An enlarged view of the portion covered by 0 is shown in FIG. The configuration of the embedding material 1 itself is as described in the first embodiment,
The end portions 1a of the embedding material 1 are connected to each other while being covered by the connecting cloth body 10 wound between the embedding materials 1 and 1 to form a drainage structure.

In the following, the embedding material 1 with the connecting cloth body 10 is used.
An example of work for connecting the end portions 1a of the above will be described with reference to the drawings. FIG. 12 is a schematic plan view showing a state in which the connecting cloth body 10 a is arranged on the end portions 1 a, 1 a of the embedding material 1. The connecting cloth body 10a includes a covering portion 11 having a substantially rectangular shape and a fixing cord portion 12 (12a to 12a) extending from four corners of the covering portion 11.
d) and, for example, the length L ₁ of the covering portion 11 in the winding direction is longer than the outer peripheral length l of the lightweight embedding material 1, and the length allowing the outer circumference of the lightweight embedding material 1 to be wound multiple times. Is preferably

The material of the covering portion 11 is preferably water permeable, and more preferably made of the same material as the bag-shaped body 2. Examples include natural fibers such as hemp, synthetic fibers such as polypropylene, nylon, polyvinyl chloride, and polyester, as well as knitted or woven fabrics made of various fibers such as those obtained by blending them, or mesh-like materials such as non-woven fabrics. Things etc. are mentioned. Further, when a bag-like material or a net-like material is made of a synthetic resin such as polypropylene, it is chemically very stable and can withstand long-term use sufficiently. Furthermore, the durability may be improved by combining a natural fiber such as hemp and a synthetic fiber such as polypropylene.

As an example of the non-woven fabric, a mantle (manufactured by Toray Industries, Inc.) and the like can be mentioned as in the case of the bag-shaped body 2 and the sheet body 5. The effect of using the non-woven fabric such as the mantle for the covering portion 11 is similar to the case of using the non-woven fabric such as the mantle for the sheet body 5, and the bag-shaped body 2, the sheet body 5, and the covering portion 11 all have the above-mentioned effects. If a non-woven fabric such as mantle is used, the above effect is further improved.

The fixing cord portions 12 extending from the four corners of the clothing portion 11 do not necessarily have to extend from the four corners of the covering portion 11. In another embodiment, for example, they extend from predetermined positions on the end sides of the covering portion 11. Or may extend from the surface of the covering portion 11, for example.

Further, the fixing cord portions 12a to 12d may be sewn to the four corners of the covering portion 11, or two opposite sides 11a of the covering portion 11 may be formed so as to extend from the four corners of the covering portion 11. 11b, or the other two opposite sides 1
It may be woven into 1c and 11d.

The above-mentioned fixing cord portion 12 may have a strip shape or a rope shape having an elliptical or circular cross section. The material of the fixing cord portion 12 may be water-permeable as in the case of the covering portion 11 or may be the same as the material of the bag-shaped body 2. Further, the fixing cord portion 12 holds the covering state by the covering portion 11, and since the surface area occupied by the civil engineering water conducting body 10 is never large, it does not necessarily have water permeability or the material of the bag-shaped body 2. It does not have to be the same material as that of the above, and may be any material having strength and flexibility capable of withstanding the knotting work.

The connecting cloth 10 may have various forms, and the example shown in FIG. 13 is one of them.
In the illustrated example, on the end portion 1a of the lightweight embedding material 1, a connecting cloth body 10 of a different form from the connecting cloth body 10a shown in FIG.
b is arranged. The connecting cloth body 10b includes a rectangular covering portion 11 and a fixing surface fastener 13 attached to the front surface and / or the back surface of the covering portion 11. The fixing hook-and-loop fastener 13 is a pair of supports 1 that are adhered to each other.
3a and 13b, each of which is formed at a position where both supports can adhere to each other when the end portions 1a of the lightweight embedding material 1 are covered with the covering portion 11. Cover 1
The length L ₂ in the winding direction of 1 is the same as that of the connecting cloth body 4a described in FIG.

Support 13a for fixing surface fastener 13,
The mounting position of 13b is not limited to the 2 × 2 position as shown in the figure, and is a position where both supports 13a, 13b can be bonded when the end portions 1a, 1a of the lightweight embedding material 1 are covered. If it is, it may be attached at any number of places. Further, it is preferable that the attachment points are substantially evenly distributed in the left-right direction in the drawing. Further, for example, when the number of windings at the time of coating exceeds one, the mounting position of at least one support 13a (13b) of the fixing surface fastener 13 is near the center of the covering portion 11, and the like. The locations are not necessarily limited to both ends of the covering portion 11.

When the fixing surface fastener 13 is made of a material having low water permeability, the area occupied by the fixing surface fastener 13 on the covering portion 11 is kept so that the water permeability and the air permeability of the connecting portion are not impaired. It is preferable to keep it within the minimum range necessary for maintaining the coated state.

In order to form the connecting body described in the second embodiment, first, the end portions 1a of the embedding material 1 are connected to each other by the connecting cloth body 10.
On the upper base 11a side (or the lower base 11b side) of the covering portion 11 of a (10b), the upper base 11a (or the lower base 11).
It is desirable that the coating portion 11 is arranged so as to be substantially parallel to b) and that the covering portion 11 is wound in the winding direction (AA ′ direction).
After three turns, the fixing cord portion 12a and the fixing cord portion 12b, and the fixing cord portion 12c and the fixing cord portion 12d are tied to complete the connection, or one of the support members 13a of the fixing surface fastener 13 is connected. The connection is completed by adhering to the other support 13b.

As described above, as the lightweight filler to be filled in the embedding material which is a constituent material of the drainage structure, for example, a synthetic resin foam molded article having a large average diameter of 40 to 200 mm is used. In such a case, the strength of the filler can be sufficiently increased, so that a drainage structure with less deformation and fatigue can be obtained. In addition, particularly when a substantially spherical one is used as the filling material, it is possible to surely form a constant void between the filling materials filled in the bag-like body, and to improve water permeability and breathability in the drainage structure. Can be secured. Further, when a synthetic resin foam such as EPS is used as the filler, the EPS is chemically extremely stable, so that the durability of the drainage structure can be improved. Further, a flame retardant can be added during the molding of the filler, and the amount of the flame retardant added can be freely selected, so that the flame retardancy can be freely controlled according to the application.

Further, as shown in the second embodiment, the drainage in which the end portions of the embedding material are connected while being covered with the connecting cloth body wound between the embedding materials. In the structure, it is difficult for mud or the like to enter between the end portions of the embedding material, and it is possible to prevent a decrease in water permeability and water permeability in the connecting portion. Further, when the embedding materials are connected to each other by the connecting cloth body, the connecting work can be performed relatively easily without requiring a complicated process. Furthermore, since the connecting cloth body can be applied to a plurality of water conduits having various outer peripheral lengths, the cost can be reduced.

Further, since the connecting cloth body has a relatively simple structure such as the covering portion and the fixing cord portion, the parts cost and the manufacturing cost of the connecting portion can be reduced as compared with the conventional joint. it can. Further, when the embedding materials are connected to each other by the connecting cloth body, a complicated process is not required for the work, so that the work can be labor-saving and the individual difference of the work and the influence of the work environment can be reduced. . Further, since the substantially rectangular covering portion is a flat cloth body and not a tubular body represented by a conventional joint, it is possible to greatly reduce the storage space as a component.

Further, when the covering portion is wound around the embedding material, the embedding material is wound at least once by the covering portion. Therefore, it is possible to secure a state in which mud or the like is unlikely to enter between the ends of the embedding material. Further, when the number of windings by the covering portion exceeds one, it is possible to more reliably prevent the mud and the like from entering.

Further, as shown in FIG. 13, when the covering state between the end portions of the embedding material by the covering portion is performed by adhering one support member and the other support member of the fixing surface fastener. Does not require any special skills for its work,
It is possible to reduce the influence of individual differences and work on the work.

Further, the selection range of the length of the covering portion in the winding direction with respect to the outer peripheral length of the embedding material is within the range of the length of at least one of the supports formed along the winding direction. It can be scaled. In other words, the connecting cloth body having a predetermined size can be applied to a plurality of water conduits having various outer peripheral lengths. Therefore, it is not necessary to separately prepare the connecting cloth body for each outer peripheral length of the water guide body, and it is possible to reduce the manufacturing cost and the work cost.

When the covering portion has water permeability,
Water permeability can be ensured even in the connecting portion covered with the covering portion. Furthermore, in the case where the covering portion and the bag-shaped body of the embedding material are made of the same material, the properties such as water permeability and air permeability can be made uniform at the connecting portion between the embedding materials as well as other portions. . In particular, if the above materials are unified into a non-woven fabric, it is possible to obtain particularly excellent water permeability and air permeability due to the properties of the non-woven fabric.

When the covering portion has a trapezoidal shape, the end portions of the embedding material are arranged on the upper bottom side or the lower bottom side of the trapezoidal covering portion, and the covering portion is arranged in the winding direction. It is possible to make a state in which a gap is unlikely to occur between the covering portion and the end portion of the embedding material when the portion is wound. Further, since the stress during the winding work can be concentrated in the taper direction of the trapezoid, the workability can be improved.

According to the drainage structure described in detail above, since the lightweight embedding material filled with the lightweight filling material is continuous, it is extremely lightweight and the embedding material has a bag shape. Since it is held in a predetermined shape by the body, it is easy to handle. Moreover, since the embedding material is highly bendable, workability when constructing the drainage structure can be significantly improved.

A sheet body is interposed in at least one of the connecting portions of the embedding material, and the portion of the sheet body other than the portion sandwiched between the end portions of the embedding material is underground. Since the filling material in the embedding material is lightweight because it is in a state of being fixed to, the buoyancy of water that has penetrated into the embedding material causes the filling material to be densely gathered above the embedding material. Also, it is possible to prevent the entire drainage structure from moving toward the ground surface. Further, rainwater or the like that has penetrated into the ground is once absorbed over substantially the entire surface of the sheet body, and the absorbed water is guided to the direction of the embedding material. The water transfer efficiency can be improved more than the drainage structure. Further, since it is not necessary to use crushed stone or the like, it is possible to reduce costs, and it is possible to contribute to environmental conservation because mining of crushed stone is unnecessary.

[Brief description of drawings]

FIG. 1 is a schematic partial cross-sectional view showing a drainage structure according to an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing an example of a lightweight embedding material used in the drainage structure according to the embodiment.

3A and 3B are perspective views showing an example of sealing an end opening of a bag-shaped body of an embedding material.

FIG. 4 is a cross-sectional view showing another example of the lightweight embedding material.

FIG. 5 is a perspective view showing an example of a filling material filled in the bag-shaped body of the lightweight embedding material.

FIG. 6 is a perspective view showing another example of the lightweight filler.

FIG. 7 is a perspective view showing another example of the lightweight filler.

FIG. 8 is a perspective view showing another example of the lightweight filler.

FIG. 9 is a schematic cross-sectional view showing a construction example of the drainage structure according to the embodiment.

FIG. 10 is a schematic partial cross-sectional view showing a drainage structure according to another embodiment.

FIG. 11 is a schematic partial enlarged cross-sectional view showing a drainage structure according to another embodiment.

FIG. 12 is a schematic plan view showing an example of a state in which a connecting cloth body is arranged on an end portion of a lightweight embedding material.

FIG. 13 is a schematic plan view showing another example of a state in which the connecting cloth body is arranged on the end portion of the lightweight embedding material.

FIG. 14 is a schematic plan view showing a conventional drainage structure.

[Explanation of symbols]

1 Lightweight embedded material 2 bags 3 Light weight filler 4a string 5 sheet bodies 6 pipes 7 groove 8 through holes 10, 10a, 10b Connection cloth 11 Cover 12 String for fixing 13a, 13b Fixed surface fastener 20 Perforated tube 21 holes 22 Joint 30 crushed stone

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Matsushita 309 Shin Kawakami, Shinmachi, Nakagyo-ku, Kyoto Benzaitencho 309 (56) References JP-A-6-41939 (JP, A) JP-A-53-1910 (JP, A ) Japanese Unexamined Patent Publication No. 4-106220 (JP, A) Actually developed 62-50229 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E02B 11/00 E02D 3/10

Claims (3)

(57) [Claims] 1. A foamable synthetic tree in a water-permeable bag-shaped body.
A plurality of lightweight embedding materials filled with a light weight filling material made of a synthetic resin foam molded of fat at a predetermined filling rate are generally lead underground.
It is configured to be continuously embedded in the ground by connecting to each other in the direct direction, and at least one of the connecting portions of the plurality of lightweight embedding materials is arranged in a direction intersecting the continuous direction of the lightweight embedding materials. A drainage structure comprising a water-permeable sheet body having a plane area larger than a cross-sectional area of a connecting portion. 2. The drainage structure according to claim 1, wherein the sheet body is made of a non-woven fabric. 3. The drainage structure according to claim 1 or 2, wherein the lightweight embedding material is a foamed molded body formed into a substantially spherical shape.