JP2750558B2 - Drain construction method for golf course green - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for draining a golf course green or the like.

[0002]

2. Description of the Related Art Golf course green turf fabrics gradually consolidate the soil, poor drainage, and insufficient soil ventilation. As a method for preventing this, it is only necessary to thicken the floor soil and to make the content of sand in the floor soil extremely large, but a large amount of construction cost is required. As a solution to this problem, as shown in Japanese Utility Model Publication No. 52-1639, an impermeable layer is provided on the subsoil of the excavated ground, a perforated pipe is laid in a rib shape, a crushed layer is formed thereon, and a crushed layer is formed on the crushed layer. A construction method in which a net layer is provided and backfilled is generally performed. However, in this construction method, the water level in the middle part between the perforated pipes is high, and the time required for the rainfall infiltration water to reach the drainage layer is long. In addition, since soil particles enter between the crushed stones and become clogged, and drainage and air permeability are reduced, subsequent repair is necessary and troublesome. In order to prevent clogging, it is necessary to lay a multilayer filter layer, which is not an advantage.

[0003]

SUMMARY OF THE INVENTION In view of the above situation, the inventors have studied a drainage structure in which the drainage water level in the green is not high, the drainage is excellent, and no repair is required after construction. The inventors have found that it is only necessary to lay a rigid mat-like sheet uniformly on the ground with a large porosity in the horizontal direction and to provide a sand layer thereon, and repeated the test to complete the present invention.

[0004]

Thus, according to the present invention, an underdrain pipe made of a water-permeable wall is provided around the bottom edge of the ground excavated in a circular basin shape and connected to a drainage line; Synthetic resin filaments are three-dimensionally entangled and formed into a mat shape, and a culvert drain material having a filter sheet made of a synthetic nonwoven fabric laminated on both surfaces is attached; the same type structure as the culvert drain material is formed on the excavated ground surface A ground drain material is superposed on each other, and a permeable sand layer is provided on the culvert drain material and the ground drain material.

The present invention will be described with reference to the drawings. Fig. 1 is a cross-sectional view of a green that has been constructed by this method. A culvert pipe 1 consisting of a permeable wall is installed along the periphery of the ground that has been excavated in a basin to a predetermined depth and compacted. It is connected to a drainage device via a basin 2 and a water collecting pipe 3. An underdrain drain material 4 is laid so as to wrap the underdrain at the end, and a ground drain material 5 is laid on the entire ground in contact with the underdrain drain material 4. A sand layer 9 is formed. Mole prevention net 10 on the peripheral wall
Is laid.

The culvert drain material and the ground drain material are as follows:
As shown in FIG. 2, a filter sheet 7 made of a synthetic fiber nonwoven fabric is laminated on both surfaces of a three-dimensional net-like structure 6 in which synthetic resin filaments are three-dimensionally entangled and formed in a mat shape. For example, as shown in FIG. 2, as shown in FIG. 2, the filter sheet on the lower surface of the end is peeled off, the culvert is wrapped from below with the filter sheet, and further wrapped from above with the upper three-dimensional network structure and the filter sheet. Just do it.
Next, the ground drain material 5 is laid over the entire ground surface.
The edges can be overlapped with the culvert drain material by, for example, the method shown in FIG. In addition, these drain materials are long sheets, and the filtration sheet is provided with strip-shaped ears that protrude from both side edges of the three-dimensional mesh body of the sheet,
The joining between the adjacent drain members is performed by bringing the three-dimensional net-like structure into close contact and overlapping the ears. Thus, FIG.
As shown in (1), culvert drain material and ground drain material are laid. Next, a rock prevention net is attached around the ground, and backfill is performed in the order of river sand and mixed sand to cover the culvert drain material and the ground drain material, and a lawn seed is sown on this to form a green. .

The culvert drain material and the ground drain material used in the present invention will be described. These drain materials have the same structure, and are formed by heat-sealing a filter sheet 7 made of a synthetic fiber nonwoven fabric on both surfaces of the three-dimensional network structure 6. The three-dimensional net-like structure is formed in a three-dimensional three-dimensionally entangled synthetic resin filament, for example, a nylon 6 filament, and is formed in a mat shape by heat-sealing a contact point between the filaments.

In order for the three-dimensional network structure 6 to ensure excellent water permeability in the longitudinal and horizontal directions of the sheet and to maintain a sufficient stress against dynamic and static loads, the filament diameter should be 0.3 to 0.3 mm. 1.0mm, thickness 5-30mm, porosity 90
± 5%, static spring coefficient 1000 to 2000 kg / mm /
A range of m ² is used. Outside this range, it is unsuitable in terms of water permeability, strength against load, workability, economy and the like. Within the above range, appropriate ones are used according to the situation and purpose of the construction site.

The filter sheet 7 made of non-woven fabric is a non-woven fabric obtained by treating polyester fibers with nylon, for example, has a thickness of 0.6 mm, a water permeability of about 1 × 10 ^-2 m ³ / sec / m, and has a three-dimensional net-like shape. It is laminated on both sides of the structure by a heat fusion method.

[0010]

The drain material has a high porosity and excellent water permeability in the vertical and horizontal directions. For example, a filament having a filament diameter of 0.5 mm, a porosity of 95% and a sheet thickness of 9 mm has an earth pressure of 1 tf / m ² . 1.5x when the laying gradient is 5%
It shows a water permeability of 10 ^-4 m ³ / sec.
In the case of 7 mm, under the same conditions, 5.0 × 10 ⁻⁴ m ³ / sec
It is. Therefore, rainfall or the like quickly reaches the drainage layer, is discharged from the culvert pipe, and does not generate soil water that causes root rot. The static spring coefficient is 1000-2000kg
/ Mm / m ² , the rigidity is large, so that it is not crushed by earth pressure, and there is no danger of flattening and lowering drainage. Further, the filtration sheet of the three-dimensional net structure blocks the soil and the net-like body on the sheet, and allows the fine particles (silver size of 0.002 mm or less) in the soil layer in contact with the sheet to pass through and wash away. The layer near the filter has better water permeability than the layer above it, and the permeability difference between the filter, the filter contact layer and the upper layer can be made stepwise, and the flow rate of water is appropriately suppressed, so clogging will occur for a long time. do not do.

[0011]

According to the method of the present invention, drainage is performed uniformly and promptly because the entire surface of the green is collected and drained, which is convenient for play and does not require clogging for a long time without repair. . Further, since the drain material may be laid and backfilled, the work is easy, and the construction period is significantly reduced as compared with the conventional construction method. Since this method has the above characteristics, it is very useful for construction of a golf course green, an athletic field, a tennis court, and the like.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a green according to the method of the present invention.

FIG. 2 is an explanatory diagram showing a method of joining a culvert pipe drain material and a culvert drain material and a ground drain material.

FIG. 3 is a perspective view showing a state in which laying of culvert drain materials and ground drain materials is completed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underdrain pipe 2 Water collecting basin 3 Water collecting pipe 4 Underdrain pipe drain material 5 Ground drain material 6 Solid net structure 7 Filter sheet 8 River sand layer 9 Mixed sand layer 10 Mole prevention net

Claims (2)

(57) [Claims] 1. A culvert pipe formed of a water-permeable wall is connected to a drain line at the bottom edge of a ground excavated in a basin shape, and a synthetic resin filament is three-dimensionally entangled with the culvert pipe to form a mat. A culvert drain material in which a filtration sheet made of a synthetic resin nonwoven fabric is laminated on both sides of the three-dimensional net-like structure formed in the above;
A ground drain material having the same structure as that of the culvert drain material is laid on the excavated ground surface with its ends overlapped with each other; and a permeable sand layer is provided on the culvert drain material and the ground drain material. Drain method for golf course green. 2. A sheet in which a three-dimensional network structure of the culvert drain material and the ground drain material is a sheet in which synthetic resin filaments having a diameter of 0.3 to 1.0 mm are three-dimensionally entangled, and a filament diameter of 0 0.3 to 1.0 mm, sheet thickness 5 to 30 mm, porosity 90 ± 5%, static spring constant 10
Drain Method of golf green or the like according to claim 1, characterized in that the 00~2000kg / mm / m ^2.