JPS583877Y2 - Drainage material to prevent sediment runoff - Google Patents

Description

[Detailed description of the invention] This invention relates to a drainage material for preventing soil outflow, which is used on slope protection works or embankment retaining walls.

Conventionally, in slope protection works or embankment retaining walls, only soil water such as rain water or spring water that has impregnated or permeated into the soil layer of the embankment is quickly and properly drained to the outside of the slope. As a result, a drainage system is constructed to maintain the stability of the slope surface and the soil layer of the embankment. Conventionally, drainage devices have been constructed to maintain the stability of the slope surface and the soil layer of the levee body. Rod-shaped piles are used.

However, in the case of the former plastic mesh tube, there is a large difference in permeability when the surrounding water and gray water enters the tube, and the flowing water in the tube becomes larger rapidly, so that the soil water does not flow into the tube. When it enters the soil, it has the disadvantage of bringing surrounding soil particles into the cylinder, causing clogging of the mesh cylinder.In addition, in the case of the latter type of rod-shaped pile of soil suction prevention material, soil water does not clog and is not clogged. It is difficult to process small holes that are suitable for smooth drainage, and there is no filter that can function as well as a filter, so especially in areas where there is a lot of rainwater and spring water, soil and sand become stick-shaped together with soil water. It passes through the pile drainage material and flows into the chamber, and it has a major drawback that the soil above and below the bar-shaped pile drainage material is lost and forms a cavity, which can cause the embankment body to collapse. Ta.

This invention was devised in view of the above, and is intended to solve the above-mentioned conventional drawbacks by providing a drainage material for preventing soil outflow as described below.

To specifically explain the embodiments of this invention's drainage prevention material for sediment runoff shown in the drawings, 1a, 1b, and IC are each made of chemical fibers, which have great water permeability due to their crimped and entangled structure. It is a water-draining fiber layer.

This invention provides a water-draining material 1 for preventing soil outflow, in which a water-permeable canvas 2 is interposed between each of the plurality of water-draining fiber layers 1a, 1b, and IC (three layers in the embodiment shown in the drawings). It is something to do.

Note that in place of the canvas 2, other fabrics having similar physical properties and water permeability can also be used.

Therefore, when using the sediment runoff prevention drainage material 1 configured as described above as a water drainage device, first take out the majority of the sediment runoff prevention drainage material 1 outside and drain it as shown in Figure 3 of the drawing. The drainage pipe 3 is press-fitted into the rear part of the drainage pipe 3 in a narrowed state, and the drainage pipe 3 thus constructed is appropriately penetrated through the tension block 5 covering the slope of the embankment body soil layer 4 as shown in Fig. 4 of the drawings. They shall be provided respectively.

In this case, it goes without saying that the majority of the soil outflow prevention drain material 1 exposed from the rear end of the drain pipe 3 is buried in the embankment body soil layer 4, respectively.

Therefore, when used as described above, the soil outflow prevention drainage material 1 exposed outside the drainage pipe 3 acts as a strainer to capture soil particles and guide only soil water into the drainage pipe 3. This is to drain water to the outside.

As mentioned above, the drainage material for preventing sediment outflow of this invention has a plurality of water-permeable drainage fiber layers 1a, 1 made of chemical fibers.
Since the water-permeable canvas 2 is interposed between each layer of B and IC, when used as described above,
The soil water in the embankment body soil layer 4 is collected from multiple directions and from many angles into the drainage fiber layers 1a, 1b, and IC, which have excellent permeability, and each drainage fiber layer 1 a, 1 b, IC
This has the effect of smoothly and quickly draining water to the outside in a multi-layered manner by using each as an appropriate drainage layer.In particular, in this invention, a water-permeable canvas 2 is provided between each of the plurality of drainage fiber layers 1a, lb, and IC. Since they are interposed and combined, the sediment that moves from above together with the soil water and enters into this sediment outflow prevention draining material 1 is absorbed by the upper canvas 2, and the sediment that also moves and enters from below with the soil water. The lower canvas 2 prevents the intrusion into the inner layer, and completely prevents the loss of soil above and below the sediment outflow prevention drainage material 1, the formation of cavities associated with this, and the collapse of the embankment body. It has the outstanding effect of draining underground water smoothly and quickly, contributing to long-term stabilization of the embankment body and slope.

In addition, since the soil drainage prevention material of this invention does not rot, it does not cause clogging over a long period of time, and can perform stable soil drainage prevention and water drainage functions. It is economical as it does not require the use of water, and it also has the effect of assisting the drainage of underground water to the outside through capillary action.

[Brief explanation of drawings]

The drawings show an example of the drainage material for preventing soil outflow of this invention, and Figure 1 is a side view, Figure 2 is a side view of a drainage pipe,
FIG. 3 is a longitudinal side view of the device fitted in a drainage pipe, and FIG. 4 is a longitudinal side view of the main parts when used for lining a slope protection block. 1... Sediment outflow prevention drainage material, LA, LB, IC
...Water-draining fiber layer, 2...Canvas, 3...
... Drainage pipe, 4 ... Embankment body soil layer, 5 ...
...Zhang block.

Claims (1)

[Scope of utility model registration request] Multiple water-permeable water-draining fiber layers 1a made of chemical fibers
, 1 b, I C . . . Water-permeable canvas 2 is interposed and combined between each of the layers to prevent soil outflow.