JPS6325137B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a vertical embankment structure that can be applied to viscous soil such as fine-grained soil and can also be used to compact slope shoulders.

<Prior art> A method of stabilizing vertical embankment structures by embedding reinforcing materials in vertical embankments and using frictional forces between soil particles and between soil particles and the surface of the reinforcing materials is to stabilize vertical embankment structures using retaining walls. Compared to construction methods that maintain and stabilize the earth pressure of the embankment, this method allows for higher embankments, can be constructed even on relatively soft ground, and is also easy to construct.

Specific examples of such construction methods include, for example,
There is a method of burying reinforcing material in the embankment, as seen in No.-25174, and creating a skin layer on the slope using flexible metal plates. However, since the reinforcing materials used in this construction method are impermeable materials such as iron plates and plastic plates, the construction target soil itself is limited to coarse-grained soils such as sandy soils that have permeability. For this reason, research has been conducted on construction methods that can be applied to fine-grained soils such as clayey soil by imparting water permeability to reinforcing materials. Methods have been proposed to provide layers and methods that use water-permeable sheets such as non-woven fabrics as reinforcing materials.

<Problems to be solved by the invention> In particular, the construction method using a water-permeable sheet is a preferable construction method because the construction is relatively simple.
As can be seen in the figure, if the sheet is simply buried in a vertical embankment, there is a problem in that part of the sheet on the slope part 3 collapses due to the movement of soil that contains moisture due to rain etc., as seen in Figure 5. . Another problem with compaction, which is one of the embankment works, is that it is difficult to compact the slope shoulders due to the stability of the slope.

<Means for solving the problems> The present invention provides a vertical embankment structure that solves the above problems by using a water-permeable reinforcing material. ,
a lower extension, at least one
a sandbag enveloping part that envelops each of the sandbags, and a folded part that extends along the lower extension part after enveloping the sandbag, and embankment of clayey soil is placed on the lower extension part and the folded part approximately in the same plane as the sandbag. A vertical embankment, characterized in that the reinforcing material, sandbags and embankment made of clay are integrated by forming a unit placed on the ground, and by stacking the units one after another to form a slope by the envelope of the sandbag. a lower extension part, a sandbag enveloping part that envelops at least one sandbag between the lower extension part and the lower extension part after enveloping the sandbag. forming a folded part extending along the lower extension part and the folded part, stacking sandbags on the lower extension part and the folded part, and at the same time forming a unit in which a clay embankment is placed substantially flush with the sandbag, and sequentially stacking the units. This vertical embankment structure is characterized in that the reinforcing material, the sandbag, and the embankment made of clay are integrated while forming a slope by the sandbag envelope.

Moreover, it is preferable that the nonwoven fabric is a composite of a nonwoven body and a net-like body.

<Structure of the Invention> The contents of the present invention will be described in detail below with reference to preferred embodiments shown in the accompanying drawings. The present invention is not limited to these drawings unless the purpose thereof is impaired.

As shown in FIG. 1, the vertical embankment structure of the present invention comprises a unit 10 made up of clay particles 1, a sheet-like reinforcing material 2 made of water-permeable nonwoven fabric, and a sandbag 4, and the unit 10 is laminated. It is something.

In the unit 10, sandbags 4 are stacked (three in FIG. 1) on the reinforcement 2, and the water-permeable nonwoven reinforcement 2 has one end forming a lower extension 12 and the other end forming a lower extension 12. A sandbag enveloping part 14 enveloping the stacked sandbags 4 and a folded part 16 extending along the rear lower extension part 12 enveloping the sandbag 4 are formed. A clay embankment 18 is placed on the lower extension part 12 and the folded part 16 of the reinforcing material 2 so as to be substantially flush with the upper surface of the sandbag 4 at the top.
The reinforcing material 2 is buried in soil particles 1 of embankment 18 made of clayey soil.

In this way, one unit 10 is constructed.

The vertical embankment structure of the present invention is constructed by stacking these units 10 in multiple stages. In this way, one side of the sandbag envelope part 14 that surrounds the sandbag 4 forms a slope, and the reinforcing material 2, the sandbag 4, and the embankment 18 made of clay are integrated, and the lower extension part 12 of the reinforcing material 2 and the folded The portion 16 is held by the soil particles 1 of the embankment 18 made of clay, and is intended to stabilize the reinforcing material 2.

The sandbags used here may be those commonly used. Further, the number of sandbags 4 wrapped by the reinforcing material 2 in one unit 10 only needs to be at least one, and the number may be the same in each unit 10, but it may be different for each unit 10.

As will be described later, the stacked sandbags 4 are integrated with the main body of the embankment 18 by means of a reinforcing material made of water-permeable nonwoven fabric to form one vertical embankment structure, and each sandbag 4 itself is enveloped by the reinforcing material 2. Since the sandbag envelope part 14 is formed and becomes a single structure (block) with a stable shape, there is no risk of collapse even if compaction is performed.

The bendable sheet-like water-permeable nonwoven fabric reinforcement material 2 to be buried in the embankment is a reinforcing material that has high friction with soil particles, has excellent water permeability, and has low elongation under applied loads, such as polyamide fiber, Nonwoven fabrics made of thermoplastic resin fibers such as polyester fibers, polyacrylonitrile fibers, polyvinyl alcohol fibers, polyvinyl chloride fibers, polyvinylidene chloride fibers, polyethylene fibers, polypropylene fibers, and polystyrene fibers, and natural fibers such as coconut fibers and shiro fibers. Alternatively, examples of composites thereof include reinforcing materials that are a composite of these non-woven bodies and a net-like body, or reinforcing materials that are a composite of the non-woven body and the above-mentioned knitted or woven body made of fibers. . In particular, reinforcing materials composited with net-like bodies have the advantage of not only water permeability but also the ability to uniformly distribute the rolling pressure during compaction, making compaction easier. Also, the second
As shown in the figure, in order to enhance the stability of the water-permeable non-woven reinforcement 2, that is, to prevent the reinforcement 2 from slipping in the soil particles 1 of the clay embankment 18, the lower extension of the reinforcement 2 is A second row of sandbags 4 may be stacked on top of the sandbags 12 and the folded portions 16.

Here, the sandbags 4 of the sandbag envelope part 14 and the sandbags 4 loaded on the lower extension part 12 and the folded part 16 for stabilizing the reinforcing material 2 may be the same sandbag, but different sandbags may be used. The number of sandbags 4 should be at least one.

In the example shown in FIGS. 1 and 2, the folded portion 16 of the reinforcing material 2 is placed directly on the lower extension portion 12, but the present invention is not limited thereto. 1 or 4 sandbags.

The concrete construction method for constructing the vertical embankment structure of the present invention is to lay the reinforcing material 2 on the base as shown in Fig. 3a, and then lay the reinforcing material 2 on top of the reinforcing material 2 so that the lower extension part 12 can be formed. Stack 4 sandbags. Next, as shown in Fig. 3b, the end of the reinforcement material 2 is attached to the sandbag 4
, to form a sandbag envelope part 14, and a folded part 16 is superimposed thereon along the lower extension part 12. After this, clay embankment 18 is directly poured out,
The unit 10 is formed by compaction, and the second row of sandbags 4 is further inserted into the lower extension part 12 and the folded part 1.
6, and the clay embankment 18 is rolled out and compacted to form the unit 10. After the units 10 are formed by compaction, the same operation is repeated again to stack the units 10 and raise the embankment as shown in FIG. 3c.

<Effects of the Invention> As detailed above, the structure for vertical embankment of the present invention made in this way uses nonwoven fabric as a reinforcing material, so even if the embankment is made of clayey soil, water can be drained easily. As a result, it can be applied to fine-grained soils such as clay soils and silts where the soil itself has low permeability. Promoting drainage in clay embankments is
It lowers the water content ratio of soil particles, and as a result, increases the adhesive strength of soil particles. In addition, since the main parts of the reinforcing material are non-woven fabrics, the frictional resistance against soil particles is greater than that of iron plates or plastic plates, making the structure more stable.

Furthermore, the area near the shoulder of the slope can be sufficiently compacted by compaction, so the uneven settlement that has been seen in the past does not occur.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of an embodiment of a vertical embankment structure according to the present invention. FIG. 2 is a schematic cross-sectional view of another embodiment of the vertical embankment structure according to the present invention. FIGS. 3a, b, and c are schematic cross-sectional views for explaining the construction method of the vertical embankment structure shown in FIG. 2. FIGS. 4 and 5 are schematic cross-sectional views of an example of a conventional vertical embankment structure. Explanation of symbols, 1...Soil particles, 2...Reinforcement material, 4
... sandbag, 10 ... unit, 12 ... lower extension part, 14 ... sandbag envelope part, 16 ... folded part,
18... Embankment.

Claims (1)

[Scope of Claims] 1. A lower extension part, a sandbag enveloping part that envelops at least one sandbag between the lower extension part, and the lower part after enveloping the sandbag, using a reinforcing material made of a sheet-like water-permeable nonwoven fabric. A unit is formed by forming a folded part extending along the extended part, and placing clay embankment substantially flush with the sandbag on the lower extension part and the folded part, and the units are sequentially stacked to form the unit. 1. A structure for vertical embankment, characterized in that the reinforcing material, sandbags, and embankment made of clay are integrated while forming a slope by an envelope of sandbags. 2. The vertical embankment structure according to claim 1, wherein the nonwoven fabric is a composite of a nonwoven body and a net-like body. 3. The structure for vertical embankment according to claim 1, wherein the nonwoven fabric is a composite of a nonwoven body and a net body or a woven body. 4 Using a sheet-like water-permeable nonwoven fabric reinforcing material, a lower extension part, a sandbag enveloping part that envelops at least one sandbag between the lower extension part, and a sandbag enveloping part that extends along the lower extension part after enveloping the sandbag. forming a folded part, stacking sandbags on the lower extension part and the folded part, and at the same time forming a unit in which a clay embankment is placed substantially flush with the sandbag, and stacking the units in sequence to form a unit with the sandbag 1. A structure for vertical embankment, characterized in that the reinforcing material, sandbags, and embankment made of clay are integrated while forming a slope by an envelope portion. 5. The structure for vertical embankment according to claim 4, wherein the nonwoven fabric is a composite of a nonwoven body and a net-like body. 6. The vertical embankment structure according to claim 4, wherein the nonwoven fabric is a composite of a nonwoven body and a net body or a woven body.