JPS644012B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating wastewater during greening work on slopes of soil or rocks, that is, slopes artificially created through civil engineering work.

For example, if greening work is carried out by embanking a bare slope with a vast area such as a forested area and forming a vegetation base, there will be continuous rainy days after the work is done, or there will be heavy rain, etc. As the amount of rainfall increases, the water content on the slope increases, and even if herbaceous and woody plants are still established, the vegetation base and embankments may collapse and wash away, causing damage. In reality, it has been found that in places where the slope length is long, the damage from collapse and washout is small near the top of the slope, and the damage from collapse and washout increases as you get closer to the bottom of the slope. Therefore, in slope greening work, how to drain the rainwater that accumulates due to rainfall has become an important issue in order to prevent damage.

In this regard, conventionally, in the case of the largest slope,
A construction method is known in which steps are provided at regular intervals to reduce the flow rate of water flowing down the slope and prevent collapse due to erosion. However, even with the above-mentioned construction method, there is a drawback that when the amount of rainfall increases, the water content on the slope increases and the berm and slope are scoured. Therefore, if the hardness of the vegetation base installed on the slope is increased, for example, if the soil hardness is set to 30 or higher (according to the Yamanaka soil hardness meter), collapse can be prevented to some extent, but on the other hand, if the vegetation base is too hard, the plants will With no hope of taking root, the plants wither and die, making it impossible to achieve the desired greening.

The present invention has been provided in view of the above points, and is intended to be used to install rain ditches formed by torrential rain, etc. on bare slopes that require greening, and small berms for dividing the slope length into regular intervals. It consists of a formed horizontal groove and a vertical groove provided so as to communicate with the horizontal groove of each small step, and the vertical grooves are set to maintain a constant interval and to be discontinuous at the top and bottom of the small step. It communicates with the small steps in the upper and lower parts, and also forms a pocket part at each communication intersection part, widens the vertical groove at the intersection part so that water can be conducted to the tip of the slope, and fills the rain groove, horizontal groove, and vertical groove with mortar or The gist is that a waterway was created using the concrete spraying method, and a vegetation base was formed on the bare slope except for the waterway.

Next, to explain an embodiment of the present invention, FIG. 1 is a schematic diagram showing a rain groove 2 formed on a bare slope 1, a horizontal groove 4 using a small step 3, and a plurality of vertical grooves 5 connected thereto. be.

Rain ditch 2 was naturally formed by being excavated by torrential rain. Further, the horizontal groove 4 has an interval s of about 10 m between the upper and lower steps, and a V-shaped groove is provided along the small step 3 (indicated by a chain line) as shown in FIG. The vertical grooves 5 have an adjacent spacing _S1 of 10 to 20 m, and form the same V-shaped groove as the horizontal grooves as shown in Fig. 3, but the width w is increased at the part where they intersect with the horizontal grooves 4. . And the horizontal groove 4 and vertical groove 5 of the said part and the bottom ₄ of the rain groove 2.
5 ₁ has a flat bottom as shown in Figures 5 and 6. In addition, in relation to the horizontal grooves 4 and the vertical grooves 5, they are slightly inclined so that the water can easily flow down along the vertical grooves and rain grooves that communicate downward from the horizontal grooves. Also, the vertical grooves 5 are at least vertical grooves 4 ¹ 4 ² or 4 ² 4 ⁿ in the upper and lower sections.
shall be installed separately so that they do not communicate directly.

Next, the water channel 6 is constructed by spraying the horizontal and vertical grooves 4, ₅ and the rain gutter ₂ using a mortar or concrete spraying method. It is possible to bury the anchor.

The construction process for the vegetation base 7 shown in Figures 2 to 7 consists of a sprayed layer of 10 cm thick, 17 ^{m 3 of} mountain sand (including pumice), 255 kg of konjac powder, and slow-release fertilizer (High Control 180, 700 etc. = product name) 15
Kg is stirred with a mixer, and then sprayed onto the slope 1 with a nozzle while being mixed with 1,500 to 2,000 kg of water using a spraying machine or the like.

As described above, the present invention utilizes rain ditches 2 scoured on bare slopes 1 that have collapsed due to torrential rains, etc., and also forms horizontal grooves 4 on small steps 3 provided on the slopes, and furthermore forms vertical grooves 4. Since the grooves 5 communicate with the upper and lower horizontal grooves in a different manner, the rainfall flows laterally through the horizontal grooves 4 and sequentially flows down through the rain grooves 2 and vertical grooves 5, so that the amount of rainfall is reduced to 6. is drained while dispersing it. Even rain ditch 2
Drainage is more efficient because it is originally formed in areas where water can flow most easily. Since the waterway 6 is made of a sprayed layer of mortar or concrete, the waterway 6 will not be destroyed even by a large amount of rainwater caused by torrential rain after construction. Furthermore, since the vegetation base 7 on the slope excluding the waterway contains flying powder of konjac, this acts as an adhesive, so that the boundary of the waterway 6 is also densely covered and scoured by rain. Therefore, there is no risk of new rain grooves being formed other than the rain groove 2 described above.
In addition, since the above-mentioned vegetation base has a durable structure in which the waterway 6 is sprayed with mortar or concrete, by maintaining the soil hardness at around 23, it is possible to prevent the slope 1 from collapsing even in heavy rainfall. Moreover, there is no risk of damaging the survival of plants.

Also, by slanting the intersection of the horizontal grooves 4 communicating with the upper part of the vertical grooves 5 toward the vertical grooves, rainwater can flow smoothly. Moreover, the vertical groove 5 that communicates with the upper and lower horizontal grooves is the lower part 5 that communicates with the lower horizontal groove.
₁ , the vertical and horizontal grooves 5 and 4 are made into a V-shape, and the bottom portions 5 ₁ and 4 ₁ of the intersecting portions are made flat to form the pocket portion 8. It has the effect of weakening the force of water, making it a new and useful wastewater treatment method for this type of slope greening work.

[Brief explanation of drawings]

Fig. 1 is a schematic front view of a slope on which the wastewater treatment method according to the present invention has been applied, Fig. 2 is an enlarged side sectional view of section a in Fig. 1, and Fig. 3 is an enlarged cross-sectional view of section b in Fig. 1. , FIG. 4 is an enlarged front view of section c in FIG. 1, FIG. 5 is an enlarged side sectional view of section d in FIG. FIG. 1 is an enlarged cross-sectional view of part e in FIG. 1; 1... Slope, 2... Rain ditch, 3... Small step, 4...
Horizontal groove, 5...vertical groove, 6...channel, 7...vegetation base, 8...pocket part of the channel.

Claims (1)

[Claims] 1. On slopes that require greening, rain ditches formed by torrential rain, etc., horizontal ditches formed into small steps to divide the slope length into regular intervals, and horizontal ditches on each small step are installed so that they communicate with each other. The vertical grooves are maintained at a constant interval and are set to be discontinuous at the top and bottom of the berm, so that they communicate with the berms in the upper and lower parts, and pockets are provided at each communicating intersection. At the same time, the vertical groove at the intersection is widened so that water can be conducted to the tip of the slope, and a waterway is created in the rain gutter, horizontal groove, and vertical groove using mortar or concrete spraying method, and the bare area except for the waterway is A wastewater treatment method for slope greening work characterized by forming a vegetation base on the slope.