JPS62236923A - Slope construction work - Google Patents

Abstract

PURPOSE:To exactly attain vegetating work on a slope by a method in which indicating lines are drawn from three directions on a triangular coordinate provided with evaluating points from hardness index, soil quality index, and condition index, and the range surrounded by the indicating lines is selected. CONSTITUTION:A hardness index A is displayed by evaluating each of soil hardness, air-dryness, finger-pressure depth, setting limit, crack, and stratigraphic interval in the form of 0-10 points. A soil quality index B is displayed by evaluating each term of soil quality section, plasticity, cohesion, water permeability, soil testing, and rock and gravel in the form of 0-10 points. A condition index C is also displayed by evaculating each term of surface flow state, roughness, dryness, weather condition, and snow-covering condition in the form of 0-10 points. The indexes A, B, and C are plotted on numeral portions of each side of a triangular coordinate, indicating lines of about 60 deg. are drawn to two directions from the points, and the range surrounded by the indicating lines of three directions is selected as most suitable.

Description

[Detailed description of the invention] 11 Purpose of the invention The present invention relates to a slope construction method.

Conventionally, when selecting a slope construction method, it was simply a matter of determining whether the hardness of the slope could support the rooting and growth of plants.

However, since this conventional slope construction method is based on individual judgment based on personal experience, seedlings may not be able to take root after construction and may wither.
Cracks were appearing on the mortar surface. In order to eliminate such problems, it is necessary to solve a fundamental problem, and the present invention aims to provide a construction method that justifies the validity of the vegetation greening construction method as much as possible. The purpose is to

2. Structure of the Invention The structure of the present invention and its usage will be explained based on the embodiments shown in the drawings.

(b) Regarding individual slope survey questionnaires.

FIG. 1 shows the structure of a slope survey sheet used in the present invention.

Survey items (1) to (121) display the situation type for each item divided into (A) to (G), but this is to record the situation at the site.In other words, at the site , select and mark one item for each item in this survey.

(13J represents the hardness index (A), which is 1) soil hardness, 2) air-dry hardness, 3) acupressure depth, and 4) rooting limit.

It is divided into 6 items: 5) cracks, and 6) stratigraphic spacing, and each item is evaluated on a scale of 0 to 10 and given a 2 rating.

Although the purpose of the evaluation is expressed in text, the purpose is to obtain an evaluation score. Let's take this score.

α permeation represents the soil index (B), which consists of six items: 1) soil type, 2) periodicity, 3) adhesion, 4) permeability, 5) soil testing, and 6) rock and gravel content. It is divided into 0 to 0 for each item.
Evaluate on a scale of 10 and make a 2 judgment.

The purpose of this judgment is to obtain an evaluation score, and the method is the same as in the case of the hardness index (A).

a9 represents the condition index (C), which is divided into six items: 1) flow surface performance, 2) degree of weathering, 3) degree of deterioration, 4) degree of dryness, 5) meteorological conditions, and 6) snow conditions. and 0 for each item.
-Evaluate on a scale of 10 and give a rating of 2.

The purpose of this judgment is to obtain an evaluation score, and the method is the same as in the case of the hardness index (A).

(b) Slope construction method selection coordinates The hardness (A
), Soil Properties (B) 2 Plot each index of condition (C) on the numerical part of each side of the triangular coordinates, draw a 60 degree indication line in red etc. in two directions from this point, and draw the indication in three directions. The range surrounded by lines is the applicable candidate construction method.

From the several candidate construction methods presented in this way, each type (A) to (G
), and select and decide on the vegetation greening method, combined netting method, etc. that best suits the site situation.

Next, an example of use of the present invention will be described.

First, for each survey item in the "slope survey individual sheet" shown in Figure 1, mark the local situation in the corresponding place (see Figure 3). The route belongs to the Teradomari Formation, which has a high frequency of landslides, and has gray mudstone geology that is sensitive to dry and wet conditions.Erosion has begun in some areas, and even immediately after the snow melts, there is leachate from the bottom of the gravel layer. It is far from faults and volcanic communities, so there is little impact on the route.

The average hardness index is 5.2, which is slightly above the limit of possible vegetation.

The average soil quality index is 5.8, making it difficult to support vegetation under the current conditions.

The average condition index is 6.7, which is a severe condition, so both the vegetation greening method and the combined netting method are necessary.

Therefore, if the survey result scores are plotted on the "slope construction method selection coordinates" shown in FIG. 2 based on these indices, the result will be as shown in FIG. 4.

As a result, the mesh area surrounded by the indication lines A, B, and C becomes the compatible candidate construction method. Therefore, candidate soil spraying, vegetation hole big air bedrock greening soil bacteria, and bedrock greening organic material were selected as greening methods, but among these, the vegetation hole pitskue was excluded due to its sensitive geology, and the bedrock greening method was excluded. Greening organic matter is also excluded because it is expensive and there are other methods. Next, for combined netting, etc., use a net with fertilizer bags.

Candidate construction methods were tortoiseshell wire mesh, special adhesive mortar, diamond-shaped lath rope balls, and lightweight frame construction, but among these, nets with fertilizer bags were excluded because they do not adapt to the geology of snow-covered areas, and tortoiseshell wire mesh was selected. Light slope construction is excluded because it lacks the strength to protect the geology, and lightweight slope construction is also excluded because the foundation that holds the slope lacks geological strength.

As candidates selected in this way, the first candidate is soil spraying for greening methods, special adhesive mortar for combined netting, etc., and the second candidate is rock wall greening soil fungi for greening methods, etc. For net tension work, etc., it became a diamond-shaped lath rope ball.

3. Effects of the invention Since the present invention has such a configuration, the predetermined "slope survey individual sheet" and "slope construction method selection coordinates" are
By using it on-site, it becomes possible to easily and accurately select candidates such as slope vegetation greening method, combined netting method, etc., and decide on the most suitable method. The shortcomings of relying on experience can be completely eradicated, and slope work can now always be carried out based on objectively valid basic materials, which has a tremendous effect. .

[Brief explanation of drawings]

Fig. 1 shows the slope survey data, Fig. 2 shows the slope construction method selection coordinates, Fig. 3 shows an example of how Fig. 1 is used, and Fig. 4 shows an example of how Fig. 2 is used. Patent applicant: Green Sangyo Co., Ltd. Procedural amendment (method) July 24, 1985 1, Indication of the case Patent application No. 1983-077883 2, Name of the invention Slope construction method 3, Person making the amendment Case and Relationship between Patent Applicant 4, Agent June 24, 1986 1-1 "J-6, Drawings to be amended (Figures 3 and 4) 〒, Contents of the amendment as shown in the attached sheet.

Claims (2)

[Claims] (1) Field conditions are displayed for the following items: mountain forest vegetation, neighboring vegetation, representative geology, soil color, landslide traces, rock ratio, gully erosion, spring water wetness, background conditions, strata inclination, fault axis, and volcanic community. In addition to listing each type, the hardness index, soil texture index, and condition index are listed separately for each item.For the hardness index, soil hardness, air-dry hardness, acupressure depth, rooting limit, crack degree, and layer. For soil index, soil classification, plasticity, cohesiveness, permeability, soil test, rock and gravel content, and for condition index, slope condition, degree of weathering, degree of devastation, degree of dryness, meteorological conditions, and snow conditions. A slope survey individual sheet is provided in which each score is recorded, and on the other hand, a triangular coordinate is provided in which the evaluation score is recorded according to the hardness index, soil texture index, and condition index of the survey individual sheet. A slope construction method in which a direction line is drawn and the area surrounded by the direction line is selected as the most suitable vegetation greening method, etc. (2) The slope construction method described in claim (1), which includes a construction method such as combined netting in triangular coordinates.