JPH0620523U - Underdrain drainage - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an underdrain drainage material that can be constructed in a short period of time, has sufficient pressure resistance, can be easily cut, and is highly flexible. [Structure] A flexible cloth-like substrate 8 having a filtering effect, a flexural modulus of 9000 to 3 with a fineness of 600 to 7,000 denier.
A pile thread made of synthetic fiber of 0000 kg / cm ² is sewn on, and the height of the cloth-like substrate 8 is 3 to 20 m on the entire front surface side.
A large number of m loop piles 9 are formed at intervals of 1 to 10 mm.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an underdrain drainage material that can be easily installed and efficiently collected and drained in places where drainage is required such as in fields, golf courses, grounds, and roof gardens.

[0002]

[Prior art]

 Conventionally, tubular drainage materials such as perforated pipes and reticulated pipes and flat-shaped drainage materials such as highly elastic synthetic fiber reticulated mats have been used.

[0003]

[Problems to be solved by the device]

 Drainage materials such as the ground are required to collect and discharge the generated excess water in a short time and to maintain its collecting and draining capacity for a long time. In addition, due to the labor shortage in recent years, materials that can be constructed in a short period of time have been demanded.

In response to such demands, the tubular underdrain drainage material such as a perforated pipe or a net-like pipe is used, for example, as shown in FIG. Therefore, it is necessary to lay the crushed stone 3 and the surface soil layer 4 on the surface of the crushed stone 3, and arrange and embed a perforated pipe (or a net-like pipe) 5 in the layer of the crushed stone 3 as a drainage material. Therefore, in order to construct a large area, it is necessary to excavate a plurality of trenches 2, resulting in a problem that the construction period becomes long and the construction cost increases. Further, when used in the field, there was a risk that the crushed stone 3 used as the filter medium would be caught in the cultivator and the like and destroy the cultivator and the like.

Further, in the flat drainage drainage material such as a highly elastic synthetic fiber net mat, the groove to be buried may be shallower as compared with the tubular drainage drainage material described above, so that the drainage material is tubular in terms of construction period. However, as shown in FIG. 8, the fibrous material 6 is three-dimensionally and irregularly entangled in a non-woven fabric 7 as a filter medium, so that the pressure resistance is improved. It is difficult to improve only the rigidity in the given thickness direction, and if a material with high rigidity and a large fiber diameter is used to obtain pressure resistance, it will be easy to obtain the dimensions required for a structure with high rigidity in all directions. It becomes impossible to cut, and the horizontal water permeability becomes poor. In addition, since it is not flexible enough to be wound into a roll, it is unavoidable to connect several meters at the construction site, which is troublesome.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is possible to construct in a short period of time, have sufficient pressure resistance, and easily cut and have a flexible underdrain. The purpose is to provide a drainage material.

[0007]

[Means for Solving the Problems]

 In this invention, as a means for solving the above problems, the main feature is to use a flexible cloth-like base material sewn with pile threads made of relatively hard synthetic fibers. is there.

That is, the drainage material of the underdrain according to the basic structure of the present invention is a synthetic cloth material having a filtering effect and a flexural modulus of 9000 to 30,000 Kg / cm ² with a fineness of 600 to 7,000 denier. A pile thread made of fibers is sewn on, and a large number of loop piles having a height of 3 to 20 mm are formed at intervals of 1 to 10 mm on the entire surface of the surface of the cloth-like substrate. (Hereinafter, this is also referred to as "basic structure").

In the underdrain drainage material of the present invention, a non-woven fabric, a woven fabric, or a knitted fabric may be bonded as a filter medium to the loop pile side of the basic structure (hereinafter referred to as a first modified example).

Further, the drainage material of the underdrain of the present invention may be one in which two of the above-mentioned basic structures are superposed in a pair so that the loop pile sides are inside each other. Is referred to as a second modified example).

Further, it is also possible to have a structure in which two or more pairs of the above are further stacked (hereinafter referred to as a third modified example).

In addition to the basic structure and the modified examples thereof, the set and arrangement of the basic structures may be variously changed according to the application and the place of construction.

[0013]

[Action]

 The underdrain drainage material according to the basic structure of the present invention is used in a place where a pile surface of the underdrain drainage material comes into contact with a material such as concrete which is unlikely to cause depression, such as a roof garden, where filter media is not required. It is good to use and all piles stand upright at the same height in the thickness direction, so good pressure resistance can be obtained even with a low pile density per unit area, and in terms of material cost and water permeability, it can be used in the conventional flat plane. It is more advantageous than the drainage material in the shape of underdrain. Moreover, since the piles are connected to each other only in the vertical direction on the back surface of the cloth-like substrate in the horizontal direction, they are easier to cut and more flexible than conventional flat drainage drainage materials. Since it is abundant, it can be wound into a roll, so there is no need to connect it at the construction site.

Further, the underdrain drainage material according to the first modified example of the present invention requires a filter medium on both sides because both sides of the underdrain drainage material come into contact with soil, sand, etc. as in a ground or the like. Used in place.

Furthermore, the underdrain drainage material according to the second and third modified examples of the present invention is used, for example, in a field or the like, in a place where the underdrain drainage material is buried relatively deep and a high earth pressure is applied. When the above-mentioned basic structure or the underdrain drainage material according to the first modification is applied to a place with a high earth pressure, the loop pile may collapse from the root part and a sufficient drainage effect may not be obtained. I have something to do. On the other hand, in the underdrain drainage materials according to the second and third modified examples, the piles of the two structures are alternately opposed to each other and are engaged with each other, so that the piles do not easily fall and a very high pressure resistance is obtained. Like

[0016]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. A crimped multifilament made of polyester (polyethylene terephthalate) with a thickness of about 2000 denier is used as warp and weft threads. Using a Sulzer loom, both warp and weft threads have a density of 18 threads per inch. A plain weave 8 was obtained.

Next, as shown in FIGS. 1 and 2, using the plain woven fabric 8 as a cloth-like substrate, a monofilament yarn made of polypropylene having a perfect circular cross section and a thickness of about 2000 denier (flexural modulus of about 15,000 Kg / Cm ² ) as a pile thread, and a loop pile 9 having a height of about 10 mm is formed at intervals of about 10 in 1 inch in the length direction and about 6 in 1 inch in the width direction. Got 10.

The basic structure 10 is manufactured in the same procedure as manufacturing a tufted carpet using a tufting machine used in manufacturing a tufted carpet having a normal loop pile, for example.

Next, as shown in FIG. 3, two sheets of the above-mentioned basic structure 10 are piled up with the surfaces of the loop piles 9 inside each other, and the underdrain collection drainage material 11 corresponding to the second modified example described above is obtained. Obtained. When manufacturing this underdrain drainage material 11, the width of the cloth-like base material 8 is made wider than the necessary pile width as shown in FIG. 4 in order to prevent soil, sand, etc. from entering the inside from both ends. After arranging and stacking, both ends may be adhered or sewn to each other with, for example, a sewing thread 12. The underdrain drainage material 11 thus obtained has a high strain resistance of about 20% when a load of 10000 Kg / cm ² is applied, and is flexible and has a roll property. It can be wound into a shape and can be easily cut with a cutter knife or the like.

If a plurality of the above-mentioned underdrain drainage materials 11 are piled up (corresponding to the above-mentioned third modified example) if necessary, for example, as shown in FIG. Compared with 11, the effect of doubling the drainage capacity can be obtained.

As shown in FIG. 6, if a filter medium 13 is attached to the loop pile 9 side of the basic structure 10 (corresponding to the above-mentioned first modified example), both sides of the underdrain drainage material will have soil, sand, etc. It will be suitable for construction in a place that comes into contact with.

The cloth-like base material 8 used in the present invention is a woven fabric, a knitted fabric, a non-woven fabric, or the like, unless it is destroyed by the sewing of pile threads or the physical properties such as strength are extremely deteriorated. Any of these composites may be used, and if the material has excellent corrosion resistance, natural fibers such as coconut fiber and palm fiber, or synthetic fibers such as polypropylene, polyester and polyamide, Alternatively, it may be a composite thereof, and its fiber density, thickness, opening ratio, and opening diameter are appropriately determined depending on the particle size of soil particles of the soil where the underdrain drainage is used and the required water permeability. You can choose.

On the other hand, the pile yarn used in the present invention is preferably made of synthetic fibers such as polypropylene, polyester and polyamide having a fineness of 600 to 7,000 denier and a bending elastic modulus of 9000 to 30000 Kg / cm ^2. In order to reduce the density of the water to increase the water permeability in the horizontal direction and to maintain high pressure resistance, it is preferable to use a monofilament whose cross-sectional shape is not flat. If the fineness is less than 600 denier, piles must be formed at a high density to maintain pressure resistance, which is disadvantageous in terms of processing cost. If a pile yarn having a fineness of more than 7,000 denier is used, it becomes difficult to sew it to the cloth-like substrate 8 by the method described later. On the other hand, when pile yarns with a bending elasticity of less than 9000 Kg / cm ² are used, it is necessary to increase the pile density in order to maintain high pressure resistance, which not only increases the material cost but also the horizontal water permeability. Is also damaged. Further, when a pile yarn having a flexural modulus of more than 30,000 Kg / cm ² is used, it becomes difficult to sew it to the cloth-like substrate 8 by the method described later.

As an example of a method of sewing the pile yarn to the cloth-like substrate 8, there is a method of producing a so-called loop pile tufted carpet. In the same manner, it is preferable that a pile thread is driven from the back surface of the cloth-like substrate 8 to form loop piles 9 having a height of 3 to 20 mm at intervals of 1 to 10 mm. If the height of the loop pile 9 is less than 3 mm, sufficient horizontal water permeability cannot be obtained, and if it exceeds 20 mm, the loop pile 9 cannot withstand pressure and is deformed, and efficient water collection and drainage cannot be performed.

Examples of the filter medium 13 used in the first modified example include a water-permeable nonwoven fabric, a woven fabric, and a knitted fabric. The fiber density, thickness, opening ratio, and opening diameter of the filter medium 13 are the underdrain drainage material. It can be selected according to the particle size of the soil particles used and the required water permeability. Further, the material may be natural fiber such as coconut fiber or palm fiber, or synthetic fiber such as polypropylene, polyester or polyamide, or a composite thereof, as long as it has excellent corrosion resistance.

[0026]

[Effect of device]

 As described above, according to the present invention, since the parts that act as water passages are composed of pile structures that are independent of each other in the horizontal direction and have high rigidity, the apparent density is low and the horizontal horizontal permeability is high. And has high pressure resistance. Therefore, when the underdrain drainage material consisting of such a structure is buried in the soil, rainwater, spring water, etc. pass through the filter material and enter the pile structure, and are drained as a water passage in the pile structure. Moreover, since the filter medium prevents the sediment from entering the structure, the drainage function can be maintained for a long time. Moreover, it can be easily cut, is highly flexible, and can be wound up in a roll shape, which can simplify the work at the time of construction.

[Brief description of drawings]

FIG. 1 is an enlarged schematic cross-sectional view of a underdrain drainage material, which is the basic structure of the present invention, as viewed from the front.

FIG. 2 is an enlarged schematic cross-sectional view of a underdrain drainage material, which is another example of the basic structure of the present invention, seen from the side.

FIG. 3 is an enlarged schematic cross-sectional view of the underdrain collector / drainage material according to the second modified example of the present invention as viewed from the front.

FIG. 4 is an enlarged schematic cross-sectional view of a culvert drainage material according to a second modified example of the present invention in which the ears are sewn together as seen from the front surface.

FIG. 5 is an enlarged schematic cross-sectional view of the underdrain drainage material according to the third modified example of the present invention as seen from the front side.

FIG. 6 is an enlarged schematic cross-sectional view of the underdrain collector / drainage material according to the first modified example of the present invention as viewed from the front.

FIG. 7 is a cross-sectional view showing the structure of the underdrain drainage using a conventional perforated pipe.

FIG. 8 is a perspective view of a conventional planar underdrain drainage material.

[Explanation of symbols]

 8 Cloth-like substrate 9 Loop pile 10 Structure (drainage drainage material) 11 Underdrain drainage material

Claims (4)

[Scope of utility model registration request] 1. A flexible cloth-like substrate having a filtering effect, having a fineness of 600 to 7,000 denier and a bending elastic modulus of 9000 to 0000.
A pile thread made of synthetic fiber of 30,000 Kg / cm ² is sewn on and the height is 3 to 20 m on the entire surface of the cloth-like substrate.
An underdrain drainage material, characterized in that a large number of m loop piles are formed at intervals of 1 to 10 mm to form a structure. 2. An underdrain collection drainage material obtained by laminating a nonwoven fabric, a woven fabric, or a knitted fabric as a filter medium on the loop pile side of the structure of claim 1. 3. An underdrain collection and drainage material, which is formed by stacking two sheets of the structure according to claim 1 in a pair so that the loop pile sides are inside each other. 4. An underdrain collection drainage material comprising two or more pairs of the pairs of claim 3 stacked together.