JPS63171909A - River embankment work - Google Patents

Abstract

PURPOSE:To make the construction of soil banking easier by a method in which a water-impermeable clay layer is formed on the surface of a levee, An aqua gel mat is applied to the clay layer and integrated together by anchors, soil is applied on them, and a plant is grown on the surface of the soil. CONSTITUTION:An embankment consists of a levee 1, a water-impermeable clay layer 4, a gelled mat 5, a plant 7, and anchors 9. The layer 4 is formed on at least the surface of the slope and crown of the levee 1 and an aqua gal mat 5 of a felt form, having a specific gravity of 0.07-0.15 g/cm<2>, which is formed by processing a water absorptive resin into a fibrous cottom form, is formed on the surface of the layer 4 and integrated by anchors 9. Cover soil 6 is placed on them and a plant 7 is grown on the surface of the soil. the occurrence of disaster such as breakage of the levee during flooding period can thus be completely prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an easy-to-implement river embankment construction method that is highly safe against emergencies such as floods and can also contribute to the maintenance and management of waterside greening.

(Prior art) In a river bank, water is flowing at the normal water level shown in Figure 2 (Fig. 2), and the embankment body 10 is not submerged in water, but in the event of a flood, it is covered with concrete. I. Water often reaches the flood level (L) at the top of the terrace.

By the way, many of the old levees were built by filling up soil from the vicinity of the site, and the levee body 10 itself is often made of permeable soil.

(Problem to be Solved by the Invention) Therefore, even if the river side is lined with concrete, etc., rainwater will seep into the embankment as shown in Figure 2.
A saturated area was formed within the area, and this water gushed out onto the surface behind the embankment, a so-called water leakage phenomenon, causing soil to flow out and the embankment to be destroyed.

In addition, the distortion force of concrete in the embankment is smaller than that of soil, so when the ground is distorted,
Concrete that cannot keep up with this will crack and lose its water-permeability. Moreover, this concrete floor looked too artificial and did not create the atmosphere that people would want to casually relax by the water.

Therefore, the idea that future urban rivers should include greenery in waterfront planning and appropriate vegetation to create a balance between nature and man-made areas has recently become popular.

(Means for Solving the Problems) This invention was made to solve the above problems. By applying the principle of making the surface an impermeable layer by layering several thousand layers of clay, we created an impermeable layer of clay.
The aim of the present invention is to build a river embankment by combining this functional stabilizing material.

In detail, this invention includes constructing a clay impermeable layer T-peritoneum on at least the many sides and the top surface of the embankment body, and processing a water-absorbing resin into a fiber-like form on the surface of the clay impermeable layer. Ratio M
O, 07~0. / j f/h'' is a river embankment construction method that is characterized by stretching a felt mat-like water gel mat, combining the two with anchors, adding soil on top, and planting plants on the surface. be.

Next, the entire construction example of the present invention shown in FIG. 1 will be explained in detail.

First, the earth near the site is filled with earth and an embankment is built.

Note that this material may be permeable soil or may be an existing embankment that has been constructed in the past.

In poems where the riverbed 2 is a permeable bed, water-stop sheet piles 3 that reach the impermeable layer are installed on the front side to block foundation water leakage. Then, from this water stop sheet pile 3, as shown in the 1st @, 11 on the front of the dam l
Clay is applied to the surface on the front side and the upper back side to form a clay impermeable layer +1. In some cases,
It is also possible to completely interpose a waterproof sheet such as a rubber sheet in this clay.

Then, on the upper surface of the clay impermeable layer l, water gelatinized pine l-j''ft, which is a feature of the present invention and will be described later, is spread.

This is because when starch is polymerized with acrylate grout, or carboxycellulose is grouted with acrylate, it absorbs several hundred times its volume of water and becomes solid.
Water has the property of forming a lump that cannot be released under pressure.

This kind of water-absorbing resin is processed into fiber cotton, and the
O, / j f force, (1) Specific gravity When the water gelled mat 5 is processed into a felt mat shape, water forms a cine water-permeable layer in the form of a solid plate. However, since the molecular structure of H2O0 remains the same, although it dries, it evaporates very slowly compared to ordinary fiber mats, and a mat of the same specific gravity of polyester or polypropylene cotton will dry up to 21% in a room with 2000% humidity and 60% humidity. Compared to the water gel mat of this invention that dries in about an hour! Then, it takes 2'AO time, that is, 10 days.

On the other hand, clay becomes sticky when it contains water, so when it becomes impervious to water or dries, it shrinks, cracking, and cracking. Therefore, in cases such as river embankments, the clay usually dries without water, causing cracks to form in the clay. However, if a flood occurs in a place with such cracks, this clay layer will become a permeable layer. It will not fulfill its role.・ Therefore, in this invention, a water gelatinized mat is applied on top of the clay impermeable layer t! ' and add c. And anchor 9 that penetrates the clay impermeable layer t is this water gelling mat! Finally, the clay impermeable layer and the water gelling mat 5 are integrated.

Then, a covering soil 6 suitable for growing a lawn is added on top of this, and plants 7 are grown on the surface. Naoza is the pavement on the top of Tenba.

(Effects of the Invention) In the embankment constructed using this invention, the concrete or asphalt lining is used to block water on the embankment surface by using clay as a permeable layer buried within the embankment, and this clay is always kept moist without losing its viscosity. In other words, the water gelatinous mat contained in the soil can be kept dry even in a room as mentioned above.
Since it takes several days, it hardly ever dries out, keeping the clay constantly moist and protecting and maintaining its function as an impermeable layer.

Also, if this water gelling mat is not present, the water that has permeated the surface clay will move in the cine direction parallel to the clay surface at the boundary with the clay. falls off and collapses. However, in this invention, the surface of the fibrous gelled mat retains the fluffy nature of the fibrous mat, so it has a large frictional force and good adhesion to the soil.
I'm fascinated by the role of keeping expenses from slipping. Furthermore, if the gelled water in the mat is also water, the water that has penetrated is also water, so the bonding and adsorption of water's ions work together to prevent a sudden boundary between flowing and sewage water. become. For this reason, there is a sagging effect in which the soil layer on top of the mat is highly unlikely to slide and break during a flood.

This is the effect when a flood occurs after the construction is completed, but when the embankment is being constructed, the water gelled mat is dry, but at this time the surface roughness of the mat is 0.6m-0, 7N(
N is the overburden load), the soil has good adhesion, and the construction of the embankment is easy.

Also, since the water gelling mat is a fiber mat, it has much higher tensile strength than the soil, so if you set an anchor by penetrating the clay layer, you can avoid an unexpected accident in which the money is washed away by the force of the flood. Even if this happens, the embankment below the mat will be protected from being washed away and will not break. Therefore, it is possible to construct a levee that can completely prevent damage caused by flooding.

Turf by surface spending on it! The embankment is made of earth and is therefore highly safe, as it can ensure complete greening through the vegetation, and unlike concrete revetments, it does not crack and lose its permeability.

In addition, the mat acts as a heavy body corresponding to the thickness of the clay layer by anchoring it, and has many effects such as easy management as it is the same as the management of an earthen embankment. He has made a huge contribution to this world.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention, and FIG.
@ is a vertical cross-sectional view showing an aspect of a conventional embankment.

Claims (1)

[Claims] A clay impermeable layer is applied to at least the surface of the embankment and the deck surface, and the surface of the clay impermeable layer is processed with a water-absorbing resin into a fiber-like form with a specific gravity of 0.07 to 0.15 g. /c
A river embankment construction method characterized by stretching a felt mat-like water gel mat of m^3, combining the two with anchors, adding soil on top of it, and growing plants on the surface.