JPS60199117A - Water drainage work for slope - Google Patents

Abstract

PURPOSE:To exactly drain free water by a method in which a water conveyance bag having water-passing voids in its inside is made up by packing granules in a bag whose downside alone is impervious to water, and a large number of the water conveyance bags are buried by butting their end portions in the trench of a slope. CONSTITUTION:A trench is excavated along the boundary between a sand layer 15 between clay layers 11 and 12 and the lower clay layer 12. Water conveyance bag 7 is set in the trench 16 by turning its side bonded with water-proof sheet 2 downwards and also turning its opening 5 side toward the upper part of the slope. The next bag 7 is inserted into the opening 5 of the previous bag 7 set by turning its sewed end with a water-passing port 17 forwards and stacked on the sheet 2. Many bags 7 so set are connected in the trench 16, soil is sprayed on the slope 18 to form a replaced soil layer 21, and turf 20 is planted. Free water such as ground water, etc., flowing from the inside of the sand layer 15 to the slope reaches the upside 8 of the bags 7, flows down the inside of the coal cinders 6, reaches the surface of the sheet 2, and is discharged through the port 17.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slope retarding drainage channel construction method for collecting and draining retarding water flowing onto a slope.

Measures are taken to prevent collapse, such as spraying mortar on the slopes that are formed when roads and railways are cut through mountains, and planting grass, but if the slopes come into contact with underground water veins. In order to prevent this, conventionally, small-diameter pipes were installed on the slope. A method of burying one end of the pipe with it protruding above the slope surface allows the free water to escape to the slope surface, but the pipe often gets clogged and does not function properly. There is a method of burying a long pipe with many through holes on the top surface under the surface of the slope to collect the free water flowing in through the holes and guide it to a drainage ditch, etc. They often clogged, and it was difficult to bend the pipes to match changes in the drainage slope of the slope.

It is an object of the present invention to provide a method for constructing a retarding water drainage channel on a slope surface, which can eliminate such problems, reliably drain the retarded water accumulated inside the slope surface, and also facilitate the installation work. This is the purpose.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1(a), one half of the short side of a fine rectangular mesh 1 made of knitted nylon thread is made of vinyl, etc. A waterproof sheet 2 made of a synthetic resin that does not have water permeability is pasted, and the net 1 is folded back at the center of the short side direction, and as shown in (b) of the same figure, the two overlapping long sides and one of the above-mentioned A bag body 3 is formed by sewing the ends of the coal with cotton thread 4, and into this bag body 3, small lumps of coal 6 having a large number of continuous pores are filled through the opening 5, and as shown in (c) of the same figure. As shown in FIG. 2, a water guide bag 7 having a substantially circular cross section with a length of about 1 m and a diameter of 20 to 30 cm has a waterproof sheet 2 pasted on the lower half, which does not have water permeability except for a water port 17 at the sutured end. Configure. In this water guide bag 7, there is a water passage gap between the sextuplets and adjacent small lumps from the filled coal, so water flowing from the mesh on the upper surface 8 of the water guide bag 7 flows down from the coal 6 and between them. Then, it reaches the top of the waterproof sheet 2 which is curved into a substantially semicircular shape.

Next, a method of constructing a retarding water drainage culvert on a slope using this water guide bag 7 will be explained with reference to FIGS. 2 and 3.

A groove 16 is cut along the boundary between the sand layer 15, which serves as the underground water vein between the upper and lower clay layers 11 and 12, and the lower clay layer 12, and the water guide bag 7 is placed in the groove 16, making it waterproof. Place the sheet 2 with the pasted side facing down and the opening 5 side facing upwards on the slope, and insert the next water guide bag 7 into the water guide bag 7 with the sutured end having the water opening 17 installed first. It is inserted into the opening 5 and placed on top of the waterproof sheet 2. In this way, by sequentially connecting a large number of water guide bags 7 and installing them in the groove 16, the waterproof sheet 2 of each water guide bag 7 forms a long drainage channel that continues like a gutter at the water inlet 17. A layer of soil 21 is formed by blowing mud onto the surface 18, and grass 20 is grown.

In this way, when groundwater such as groundwater that has flowed down within the sand layer 15 and has flowed out onto the slope 18 reaches the upper surface 8 of the water guide bag 7, it is removed from the coal 6 and into the adjacent small lumps, as described above. The water flows down between the slopes, reaches the top of the waterproof sheet 2, passes through the water inlet 17, flows down the slope on its upper surface, and is drained. This prevents the top soil 21 from collapsing due to the retarded water that collects on the slope 18. Ru. In addition, even if mortar is sprayed instead of planting grass to protect the slope 18, the soil inside one mortar may cave in due to accumulated water, causing the mortar to crack or collapse. Prevented.

FIG. 4 shows a water guide bag 7a which is a modification of the water guide bag 7 described above, in which the opening 5 of the water guide bag 7 is closed by sutures, and a drainage culvert is constructed using this water guide bag 7a. In this case, as shown in FIG. 5, flatten the upper end of the slope of the previously installed water guide bag 7a, and place the water inlet 17 at the sewn end of the next water guide bag 7a on top of it. Install. In this way, by sequentially connecting a large number of water guide bags 7a and installing them in the groove 16, the waterproof sheet 2 of each water guide bag 7a can be connected to the gutter at the water outlet 17, as in the case where the water guide bags 7 are used. It consists of a long continuous drainage culvert.

The bag 3 of this embodiment can be constructed by applying a liquid synthetic resin instead of attaching the waterproof sheet 2 to the net 1, or by overlapping the net 1 and the waterproof sheet 2 and sewing them together. It may be possible to form a lower surface that is impermeable to water, and furthermore, a cloth bag with excellent corrosion resistance may be used.In addition to 1 to 6 coal, various natural or artificial granules or lumps may be used. Although it can be filled into the water guide bag 7.7a, those having continuous pores inside, such as 5-expanded polystyrene particles, have the advantage of being lighter and having higher water permeability.

As specifically explained in the above embodiment, the method of constructing a drainage channel on a slope according to the present invention is to fill a bag with granular materials or lumps in which only the lower surface does not have water permeability, thereby creating a water-permeable gap inside the bag. By burying a large number of water guide bags with their ends facing each other in a groove cut into the slope, a drainage culvert for retarding water is formed, so it does not look like a conventional drainage channel. In addition, the water guide bag can be easily installed in accordance with the change in the drainage slope, and the work of laying the retarding drainage channel can be easily carried out.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the manufacturing procedure of the water guide bag 7 applied to the embodiment of the method of the present invention, FIG. 2 is a side sectional view of the water guide bag 7 in a buried state, FIG. 3 is the same sectional view, The figure is a perspective view of a water guide bag 7a as a modified example, and FIG. 5 is a sectional view of the water guide bag 7a in a state where it is buried. 3: Bag 6: From coal (granules or lumps) 7.7
a: Water conduction bag 16: Groove 17: Water passage 18: Slope Applicant Hoyokuka Giken Co., Ltd. Agent Patent attorney Hiroki Noguchi 1 Figure (a) 2nd time 3rd time 7 17 7 2 17 2 7177 pieces 4 times ~ r5TM + no drawing after)

Claims (1)

[Claims] A water-conducting bag having a water-permeable gap inside is constructed by filling a bag with granules or lumps in which only the lower surface has no water permeability,
A slope water retarding drainage channel construction method characterized by forming a retarding water drainage culvert by burying a large number of water guide bags with both ends butted together in a groove cut into a slope surface.