JPS621050B2 - - 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 mountain forest area and forming a vegetation base, there will be continuous rainy days after the work, or there will be heavy rains, 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, in places where the slope length is long, there is less damage from collapses and washouts near the top of the slope, and as you move toward the bottom of the slope, rain grooves form due to rain and the damage from collapses becomes greater. It is clear that 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 also 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, by setting the hardness of the soil to 30 or higher (according to the Yamanaka type 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-mentioned points, and consists of providing a horizontal groove in a berm for dividing the length of a bare slope into regular intervals on a bare land slope to be revegetated, and a plurality of vertical grooves in the horizontal groove of each berm. The upper and lower steps are made to communicate with each other by maintaining a constant interval and are formed so that the upper and lower steps are discontinuous so that water can be conducted to the tip of the step, and mortar or concrete is sprayed into the horizontal and vertical grooves. A waterway is created using the construction method, and a vegetation base is formed by spraying a mixture of mountain sand, konjac dust, and slow-release fertilizer on the bare slope excluding the waterway, while mixing it with water. Herbaceous planting, seed spraying, or greening netting is applied to the vegetation base.

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

The horizontal groove 3 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 2 (indicated by a chain line) as shown in FIG. The distance between adjacent vertical grooves 4 is ₁₀ to 20 m.
As shown in FIG. 3, it forms the same V-shaped groove as the lateral groove 3, but the lateral width w is made wider at the portion where it intersects with the lateral groove 3. Further, the bottoms 3 ₁ , 4 ₁ of the horizontal grooves 3 and vertical grooves 4 in the above-mentioned portions are flat bottoms as shown in FIGS. 5 and 6. Note that the relationship between the horizontal grooves 3 and the vertical grooves 4 is slightly inclined to facilitate flow from the horizontal grooves to the vertical grooves communicating below. Further, the vertical grooves 4 are at least connected to each other in the upper and lower portions 4 ¹ , 4 ^{2 .}
Alternatively, 4 ² and 4 ⁿ shall be provided in a staggered manner so that they do not communicate linearly.

Next, the waterway 5 is constructed by spraying horizontal and vertical grooves 3 and 4 using mortar or concrete spraying method, but reinforcing lath ₅₂ must be buried in the mortar layer ₅₁ or concrete layer. is allowed.

The construction process for the vegetation base 6 shown in Figures 2 to 6 consists of a sprayed layer of 10 cm thick, 17 m ³ of mountain sand (including pumice) per 100 m ² , 255 kg of konjac dust, slow-release fertilizer (High Control 180, 700 etc. = product name) 15
Kg is stirred with a mixer, and then sprayed onto the slope with a nozzle while being mixed with 1500 to 20001 kg of water when being sprayed by a spraying machine.

In the present invention, as described above, the horizontal grooves 3 are formed using the small steps 2 provided on the slope 1, and the vertical grooves 4 communicate with the upper and lower horizontal grooves in a different manner, so that rainfall flows through the horizontal grooves 3. Then, the water flows sideways and sequentially flows down through the vertical grooves 4, and the rainwater is dispersed through each waterway 5 and drained. Since the waterway 5 is made of a sprayed layer of mortar or concrete, the waterway 5 will not be destroyed even by a large amount of rainwater caused by torrential rain or the like. However, since the vegetation base 6 on the slope excluding the waterway contains flying powder of konjac, this acts as an adhesive, so that the boundary of the waterway 5 is also densely covered and scoured by rain. There is no risk of rain gutters forming. In addition, since the above-mentioned vegetation base is constructed with a durable structure in which the waterway 5 is made of mortar or sprayed concrete, by maintaining the soil hardness at around 23, the slope will not collapse even in heavy rainfall. prevention, and there is no risk of damaging the rooting of plants.

Furthermore, the region where the horizontal grooves 3 that communicate with the upper part of the vertical grooves 4 intersect is inclined toward the vertical grooves, so that rainwater flows smoothly. Also, the vertical groove 4 that communicates with the upper and lower horizontal grooves is the lower part ₄ that connects with the lower horizontal groove.
In addition to widening the width w of the vertical and horizontal grooves 4 and 3,
The bottom part 4 of the part where the vertical and horizontal grooves 4 and 3 intersect
By flattening ₁ and 3 ₁ and providing the pocket portion 7, there is an effect of weakening the force of water from above passing through the waterway 5, and this is new and useful as a wastewater treatment method in this type of slope greening work.

[Brief explanation of the drawing]

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. 1, and FIG. 6 is an enlarged cross-sectional view of section e in FIG. 1. 1...Slope, 2...Small step, 3...Horizontal ditch, 4...
Vertical groove, 5...channel, 6...vegetation base, 7...pocket part of the channel.

Claims (1)

[Claims] 1. Horizontal grooves are formed in the steps provided to divide the length of the bare slope into regular intervals on the bare slope to be greened, and a plurality of vertical grooves communicating with the horizontal grooves of each step are maintained at regular intervals and By forming the upper and lower steps so that they are discontinuous, the steps at the upper and lower positions can be communicated, and water can be conducted to the tip of the step, and water channels are provided in the horizontal grooves and vertical grooves by mortar or concrete spraying method, Slope greening work characterized by forming a vegetation base by spraying vegetation material made by stirring mountain sand, konjac powder, and slow-release fertilizer on the bare slope excluding the waterway, while mixing it with water. wastewater treatment method.