JPH01190830A - Slope stabilization method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a slope stabilization method for stabilizing slopes generated during construction work to prevent collapse.

[Conventional technology]

Slopes created during construction work (artificial slopes are commonly referred to as slopes) are designed based on research on the soil and ground conditions at the site.

If the soil and ground conditions are poor, the slope must be constructed with a gentle slope, which means that a large area is required for slope construction.

Normally, slope failure occurs due to slope light and progresses to the upper part of the slope, or it occurs from the shoulder of the slope due to erosion.

For this reason, it is necessary to take measures to prevent the occurrence of collapse on slopes.

By the way, when it is not possible to maintain a gentle slope due to various conditions such as land prices, retaining walls, slope construction, concrete spraying, etc.
Slope collapse prevention methods such as Nete are used alone or in combination.

[Problem to be solved by the invention]

However, all of the above-mentioned conventional slope collapse prevention works require large-scale equipment and materials for construction, and there are problems in that the construction period is long and the construction cost is high.

[Purpose of the invention]

This invention was made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a slope stabilization method that can stabilize slopes through simple construction and effectively prevent the occurrence of collapse. It is a purpose.

[Means to solve the problem]

In order to solve the above-mentioned problems, this invention uses a steel material and its oxidation promoter, and the steel material is driven into the slope and the oxidation promoter is placed in contact with the steel material to forcibly oxidize the steel material. The structure is designed to integrate with the soil.

[Operation] While driving steel into the slope, an oxidation promoter is placed in contact with the steel to forcibly oxidize the steel, and iron oxide acts as an adhesive in the soil to strengthen the steel. and the soil, to stabilize the slope and prevent collapse.

〔Example〕

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

The slope stabilization method of the present invention is based on the steel material 1 that is driven into the slope.
This is carried out using an oxidation promoter 2 placed in contact with the steel material 1, which prevents collapse due to the driving of the steel material 1, and stabilizes the slope by the mutual effect of the oxidation of the steel material 1 and the adhesive action of iron oxide. It is something that makes you change your mind.

Examples of the above-mentioned steel material 1 include a steel rod 1a such as a reinforcing bar as shown in FIG. 1, a steel rod 1a with barbed wire 1b wound around it as shown in FIG. Steel rod 1
c can be exemplified.

As the oxidation promoter 2 used in combination with the steel material 1,
For example, CaCl, NaCT-FeCI2, etc. can be used, and an example of the effusion retardant used by mixing with the oxidation promoter 2 is Ca5Oa.nH2O.

The oxidation promoter 2 can be placed on the steel material 1 by fitting a previously formed cylindrical shape into the steel material 1 as shown in FIGS. It is also possible to embed it in powder form at a position above the slope of the driven steel material 1.

Furthermore, as shown in FIGS. 14 and 15, a cylindrical steel material 1d having a large number of holes 11 in the peripheral wall may be used, and the inside of this steel material 1d may be filled with the oxidation promoter 2. Such a structure is advantageous when driving a long steel member into a slope.

In addition, in this case, the steel material 1d may be provided with slits around the periphery.

In addition, the arrangement pattern for the slope A of the steel material 1 and each steel material 1
The spacing may be freely selected depending on the length, soil conditions, and ground conditions, such as a staggered shape as shown in FIG. 11 or a triangular shape as shown in FIG. 12.

Moreover, FIG. 13 shows an arrangement pattern when using the glazed steel rods 1c.

In order to stabilize the slope, as shown in Fig. 3, the steel members 1 are driven into the slope A in a predetermined arrangement pattern, and each steel member 1 is
An oxidation promoter 2 is disposed near the rope 1 in contact with the oxidation promoter 2.

Each steel material 1 is sequentially connected using, for example, a steel wire 3.

In the driving state of the steel material 1 described above, the steel material 1 itself exerts a collapse prevention effect on the slope structure, and the oxidation promoter 2 is applied to the steel material 1 due to the influence of moisture and rainwater contained in the slope structure. It acts effectively and forcibly oxidizes the steel material 1.

Iron oxide B produced by oxidation of steel material 1 is shown in Figures 5 and 6.
As shown in the figure, it expands over time from the periphery of the steel material 1 to the downward direction of the slope A, and this iron oxide B acts as an adhesive in the soil, tightly bonding the slope structure and the steel material 1. At the same time, they are also connected to each other due to the structure of the slopes.

As mentioned above, the slope A is stabilized by the driving of the steel material 1 and the adhesive action of the iron oxide B due to the oxidation of the steel material 1,
Collapse prevention will be carried out.

FIG. 7 shows the results of measuring the oxidation of the steel material 1 driven into the slope and the amount of iron oxide permeation into the ground.

In the above, a steel rod 1a is used as the steel material 1, and as shown in FIG.
iron oxide B after implantation.
This is a measurement of the permeation range over time of iron oxide B.
shows an elliptical spread toward the downhill side of slope A.

Table 1 shows the results of a collapse test performed on the same driven steel materials as described above by artificial rain after 30 days.

Table 1 Rainfall resistance test (rainfall rate 10 mm/h) As is clear from the above test results, the test showed very excellent effects in terms of both the time the collapse started and the time the collapse ended (the state in which the collapse did not progress any further). There is.

〔effect〕

As described above, according to the present invention, a steel material is driven into a slope, and an oxidation promoter is placed in contact with the steel material to forcefully oxidize the steel material, so that iron oxides generated by forced oxidation are The adhesive action allows for a close connection between the slope structure, the steel materials, and the structure, and the mutual effect of preventing collapse by the cast steel materials ensures that the slope is prevented from collapsing.

In addition, since it is sufficient to simply drive the steel material into the slope and place the oxidation promoter in contact with it, it is possible to prevent the slope from collapsing easily and at low cost.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing a first example of the steel material used in the stable construction method of the present invention, Fig. 2 is a cross-sectional plan view of the same, Fig. 3 is a perspective view showing the same as the above when it is cast on a slope, Figure 4 is a perspective view showing the state of oxidation occurring in the same as above, Figure 5 is an enlarged sectional view in the same as above;
Figure 6 is a plan view of the same, Figure 7 is a graph of the results of measuring the permeation range of iron oxide, Figure 8 is a vertical cross-sectional view showing other examples of combinations of steel materials and oxidation promoters, and Figure 9 is FIG. 10 is a front view showing the second example of the steel material; FIG. 10 is a front view showing the third example;
13 are plan views showing different examples of steel casting patterns, FIG. 14 is a perspective view showing still another example of the combination of steel and oxidation promoter, and FIG. 15 is the same as above. FIG. 1... Steel material, 2... Oxidation promoter.

Claims (1)

[Claims] A slope stabilization method that uses steel and its oxidation promoter. The steel is driven into the slope, and the oxidation promoter is placed in contact with the steel to forcibly oxidize the steel and integrate it with the soil.