JP3889628B2 - Drainage structure of reinforced soil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drainage structure in the case of constructing reinforced soil as a slope protection work.
[0002]
[Prior art]
As a method applicable to slope protection, retaining wall construction, and tree planting method, there is a continuous fiber composite reinforced earth method in which a plurality of continuous fibers and sand are blown to construction sites to be reinforced.
[0003]
As shown in FIG. 6, the construction of the continuous fiber reinforced earth works uses an apparatus constituted by means S100 for supplying sand and means T100 for supplying continuous fibers.
[0004]
That is, on the one hand, the sand S is weighed by the measuring instrument S102 and conveyed by air pressure from the sand conveying device S104 by the pressure feeding hose S108 which is a flexible conveying tube, and on the other hand, the fibers are supplied from the fiber supply device T102 and It is injected from the injection nozzle T106 by jet water from the ejector WE at a constant weight ratio with respect to the weight, and fibers are entangled with the sand to form the reinforced soil H.
[0005]
In this way, the continuous fiber (multifilament untwisted yarn) of about 0.15 to 0.2% (dry weight ratio) of the sand used is jetted together with jet water and mixed with the sand three-dimensionally to shear. Strength can be increased and more stable and strong reinforced soil H (earth structure) can be constructed.
[0006]
By the way, when such continuous fiber reinforced soil 1 is applied to the slope 2 as shown in FIG. 7, drainage treatment is performed so that spring water during rainfall or surface water does not flow directly into the continuous fiber reinforced soil 1 from above. It is necessary to apply the back surface drainage material 11, and an underground drainage pipe (perforated pipe) 3 and an underground drainage pipe (nonporous pipe) 4 are disposed on the base part 5 at the lower end thereof.
[0007]
In the figure, 6 is an anchor with a plate as a natural ground reinforcement earthwork, 7 is a water retention / fertilizer (soil improvement material), 8 is a vegetation, 9 is buried soil, and 10 is a gutter.
[0008]
The back surface drainage material 11 selects a material that does not reduce drainage performance due to compression by the weight of the continuous fiber reinforced soil 1 or clogging. For example, when the compression load is 10 t / m ² in a mat shape with a thickness of about 3 cm, A compression rate of 50% or less and a drainage flow rate of 500 cc / sec (when 1: 1.0) or more are selected.
[0009]
The water that has penetrated into the inside of the continuous fiber reinforced soil 1 in this manner is captured by the back surface drainage material 11 and is passed through the underground drainage pipe (perforated pipe) 3 and the underground drainage pipe (nonporous pipe) 4 to the side groove 10. Flows in.
[0010]
[Problems to be solved by the invention]
The back surface drainage material 11 is a mat-like material having a thickness of about 3 cm, and is arranged with a vertical interval (1 to 1.5 m) as shown in FIG. In some cases, or when there is water that oozes out in various places, there is a risk of flowing through the back surface drainage material 11.
[0011]
The object of the present invention is to eliminate the inconvenience of the conventional example, and to drain the reinforced soil that can be effectively drained even when the spring location is unclear or there is water that oozes out at each location and can be effectively drained. To provide a structure.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, firstly, a continuous fiber yarn is injected from an injection nozzle of an ejector using high-pressure water or compressed air, while earth and sand are injected into the material hose to the injection destination of the fiber. In the case of constructing on the slope the reinforced soil by continuous fibers that are pneumatically conveyed and sprayed and mixed directly with the yarn, the mat-like back surface drainage material is arranged vertically and inclined on the ground surface of the slope, and facilities for reinforced soil thereon, the back surface drain boards to place the inclined shape, coating the underside of the side edge at an impermeable channel element, a second, high-pressure water yarns continuous fibers or Injecting from the ejector nozzle of the ejector using compressed air, on the other hand, the soil is reinforced by continuous fibers that are pneumatically conveyed through the material hose to the fiber injection destination and directly injected and mixed with the yarn. When constructing Te, arranged matted back surface drainage material on the ground surface of the slope vertically and the inclined, the reinforcing soil applied thereon, disposed drainage pipe horizontally on the back surface drain boards lower end position, this The bottom of the drainage material on the back surface is to be inserted into the drainage pipe .
[0013]
According to the first aspect of the present invention, the back surface drainage material arranged vertically is arranged in an inclined shape, so that the adjacent back surface drainage materials are aligned so that the lower end and the upper end are close to the vertical line, Since the gap between the back surface drainage materials is also inclined, water does not pass through the gap between the back surface drainage materials in a straight line, and is reliably captured.
[0014]
Further, in addition to the above action, if the water entering the back surface drainage material arranged in an inclined manner is a large amount and has a strong flow, there is a risk that the water will come out from the lower side edge of the back surface drainage material as it is. However, the non-permeable channel body covering the lower side edge acts as a ridge and reliably guides the inside of the back surface drainage material.
[0015]
According to this invention of Claim 2 , in addition to the said effect | action, the water which flows through the back surface drainage material can be reliably guide | induced to a drainage pipe by inserting a back surface drainage material lower end in a drainage pipe.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a partially cutaway front view showing an embodiment of a drainage structure for reinforcing soil according to the present invention. In FIG. 1, a continuous fiber yarn is injected from an injection nozzle of an ejector using high-pressure water or compressed air. On the other hand, a continuous fiber reinforced soil made of continuous fibers that pneumatically conveys the earth and sand through the material hose to the fiber injection destination, and is directly injected and mixed with the yarn, and 11 is a back surface drainage material.
[0017]
As described above, as the back surface drainage material 11, a material that does not decrease the drainage performance due to compression due to the weight of the continuous fiber reinforced soil 1 or clogging is selected. For example, the mat has a compressive load of 10 t / m in a mat shape with a thickness of about 3 cm. ^2. When the compression ratio is 50% or less and the drainage flow rate is 500 cc / sec or more (when 1: 1.0), the material is selected from heat-melted polypropylene resin, such as plant loofah fibers. A mat (trade name Hetimaron: Shinko Nylon Co., Ltd.) molded into a three-dimensional mesh is suitable.
[0018]
In the present invention, the back surface drainage material 11 is disposed in a vertical direction, but in an inclined shape. The inclination angle is about 60 degrees.
[0019]
Further, as shown in FIG. 2, the lower side edge 11 a of the back surface drainage material 11 arranged in an inclined shape is covered with a non-permeable channel body 12. The material of the channel body 12 may be a molded product of a synthetic resin such as vinyl chloride, a sheet material such as a vinyl sheet, a metal foil, or the like, and may be a water-impermeable resin paint or a seal.
[0020]
In the case of a synthetic resin molded product, the lower side edge 11a of the back surface drainage material 11 is fitted into this, and in the case of a sheet or metal foil, it is attached, and in the case of a resin paint, it is applied.
[0021]
In addition, an underground drainage pipe (perforated pipe) 3 is disposed in the horizontal direction at the lower end of the back surface drainage material 11, and an underground drainage pipe (nonporous pipe) 4 is further provided on the underground drainage pipe (perforated pipe) 3. Connecting. An example of the underground drain pipe (perforated pipe) 3 is shown in FIGS.
[0022]
In that case, a slit 3b is formed in the underground drainage pipe (perforated pipe) 3 in addition to the hole 3a, and the lower end of the back surface drainage material 11 is inserted into the underground drainage pipe (perforated pipe) 3 through the slit 3b. Inserted. Similarly, the end of the non-permeable channel body 12 may be inserted into the underground drain pipe (perforated pipe) 3 or may be brought into contact with the end portion.
[0023]
Furthermore, as shown in FIG. 5, the tubular auxiliary tool 13 that covers the outer periphery of the underground drainage pipe (porous tube) 3 without inserting the lower end of the back surface drainage material 11 into the underground drainage pipe (porous tube) 3. The upper flange 13 a may be sandwiched from both sides, and the water from the back surface drainage material 11 may be taken into the tubular auxiliary tool 13 and poured into the underground drainage pipe (perforated pipe) 3.
[0024]
In this way, water does not go straight through the gaps between the back surface drainage materials 11, but is reliably captured, and the water-impermeable channel body acts as a trap to ensure the inside of the back surface drainage material. Is guided to the underground drainage pipe (perforated pipe) 3.
[0025]
【The invention's effect】
As described above, the drainage structure of the reinforced soil according to the present invention is capable of effectively catching and effectively draining water even when the spring location is unclear or when there is water that oozes out at each location. .
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view showing an embodiment of a reinforced soil drainage structure of the present invention.
FIG. 2 is a longitudinal side view of a back surface drainage material.
FIG. 3 is a longitudinal front view of an underground drain pipe (a perforated pipe).
FIG. 4 is a vertical side view of an underground drain pipe (a perforated pipe).
FIG. 5 is a longitudinal front view of an underground drain pipe (perforated pipe) showing another embodiment of the present invention.
FIG. 6 is a schematic explanatory diagram of continuous fiber reinforced earth work.
FIG. 7 is a longitudinal side view of a slope with continuous fiber reinforced earthwork.
FIG. 8 is a side view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Continuous fiber reinforced soil 2 ... Slope 3 ... Underground drainage pipe (perforated pipe) 3a ... Hole 3b ... Slit 4 ... Underground drainage pipe (non-porous pipe)
DESCRIPTION OF SYMBOLS 5 ... Base part 6 ... Anchor with plate 7 ... Water retention / fertilizer (soil improvement material) 8 ... Vegetation 9 ... Burial soil 10 ... Side groove 11 ... Back surface drainage material 11a ... Side edge 12 ... Channel body 13 ... Tubular auxiliary Tool 13a ... Upper flange S100 ... Means for supplying sand T100 ... Means for supplying continuous fiber S ... Sand S102 ... Measuring instrument S104 ... Sand conveying device S108 ... Pressure hose T102 ... Fiber supply device WE ... Ejector T106 ... Injection nozzle H ... Reinforced soil

Claims (2)

Continuous fiber is used to inject continuous fiber yarn from the ejector's injection nozzle using high-pressure water or compressed air, while pneumatically conveying the earth and sand to the fiber injection destination and directly injecting and mixing with the yarn in the case of applying the reinforced soil on slopes by, arranged matted back surface drainage material on the ground surface of the slope vertically and the inclined shape, and facilities the reinforced soil thereon, arranged in the inclined The drainage structure of the reinforced soil is characterized in that the drainage material on the back surface covers the lower side edge with a non-permeable channel body . Continuous fiber is used to inject continuous fiber yarn from the ejector's injection nozzle using high-pressure water or compressed air, while pneumatically conveying the earth and sand to the fiber injection destination and directly injecting and mixing with the yarn When constructing the reinforced soil by the slope on the slope, place the mat-like back surface drainage material vertically and inclined on the ground surface of the slope surface , apply the reinforced soil on it, and place it at the bottom of the back surface drainage material. A drainage structure for reinforced soil, characterized in that drainage pipes are arranged in the horizontal direction and the lower end of the drainage material on the back side is inserted into the drainage pipe .

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