JP5043750B2 - Reinforced embankment method - Google Patents

Description

  The present invention relates to a reinforced embankment method for constructing a bank wall along an existing slope in order to stabilize the slope, and in particular, temporarily constructs a temporary bank structure as an emergency measure, and then as a long-term structure. The present invention relates to a reinforced embankment method capable of constructing a reinforced embankment wall.

Damage caused by an earthquake may cause the slope under the road to collapse and the road to be banned.
Prohibition of road traffic will have a great impact on neighboring residents, so it is desirable to restore it as soon as possible.
In order to restore the collapsed slope at an early stage, it is possible to use sandbags to apply embankment between the piled sandbags and the collapsed slope to reinforce the collapsed slope.
However, the material for the sandbag is often a woven fabric using a synthetic resin such as polypropylene. This material is greatly deteriorated by the weather and is not suitable as a long-term reinforcing wall.
Also, when weeds are removed for slope maintenance, there are cases where weeds are burned by burning the weeds on the slopes, and the sandbags may be significantly damaged by the thermal power. It is unsuitable to be placed on the surface of a long-term reinforcing wall.

On the other hand, a reinforcing embankment method as described in JP-A-2004-218263 has been developed.
The reinforcement embankment method described in the publication is to install a wall material with an L-shaped cross-section away from the existing slope, apply the embankment behind this wall material, and sequentially install the wall material on the embankment and repeat the embankment. A new embankment wall will be constructed.
The wall material is located on the surface of the embankment wall, the weather resistance is good, and the wall surface is also a reinforced embankment wall that is aesthetically pleasing.
However, the problem in the case of such a reinforced embankment method is that a large number of small wall materials are manually installed, so that the construction takes time and the construction period is longer than the sandbag construction.
Therefore, it has been difficult to adopt the reinforced embankment method using such wall materials for early restoration work.
Moreover, since it is necessary to install the wall material at every predetermined height, the wall material could not be installed when the earthwork stopped due to rain or the like.
Furthermore, the vicinity of the wall material could only be compacted with a small compactor. As a result, there may be insufficient rolling pressure near the wall surface, and the wall surface may be deformed by the deformation of the embankment after the embankment is completed.
JP 2004-218263 A

  The problem to be solved is to construct a temporary embankment structure that enables early restoration and to provide a reinforced embankment method that can construct a reinforced embankment wall that is stabilized in the long term.

Reinforcing embankment method according to the present invention, laying a copy sheet material toward the planned position of the temporary embankment structure that is appropriately separated from the existing slope,
Similarly, install a water-permeable bag-like restraint filled with filling material at an appropriate distance from the slope,
The end of the sheet material is turned from the lower side of the restraint body to the surface side of the temporary embankment structure,
Fold it over to the existing slope side on the upper side,
Embedding on the folded portion of the recording sheet material,
A wall material to be a reinforcing embankment wall is appropriately separated from the temporary embankment structure,
Remove the folded portion of the backing sheet material and extend it to the reinforcing embankment wall side, and connect with the wall surface material,
Embankment is performed between the wall material and the temporary reinforcing slope.
In addition, another reinforcing embankment method according to the present invention is to construct a temporary embankment structure by embedding the temporary embankment structure to a predetermined height,
Thereafter, a wall material to be a reinforcing embankment wall is appropriately spaced from the provisional embankment structure,
Remove the folded portion of the backing sheet material and extend it to the reinforcing embankment wall side, and connect with the wall surface material,
The step of embedding between the wall material and the temporary embankment structure is repeated.
Further, another reinforcing embankment method according to the present invention is characterized in that a rectangular box-shaped large-sized water-permeable bag-shaped member made of resin fibers is used as a restraint.
Another reinforcing embankment method according to the present invention is characterized in that a geogrid is used as a recording sheet material.
Furthermore, another reinforcing embankment method according to the present invention is characterized in that a steel net-like material bent so as to have an L-shaped cross section is used as a wall surface material.

The present invention has the above-described configuration and achieves at least one of the following effects.
<a> A temporary embankment structure was constructed using a restraint filled with filling material to enable quick restoration of the slope. Therefore, the slope was reinforced as an emergency work, and early restoration such as road traffic was made. Make it possible.
<B> The temporary embankment structure is built up to a predetermined height, and then the step of embedding between the wall material and the temporary embankment structure can be repeated to cope with construction that requires more urgency.
<C> Since the reserve sheet laid from the existing slope to the planned position of the temporary embankment structure is turned to the front side of the temporary embankment structure from the bottom of the restraint body and then folded back to the existing slope side, the restraint sheet is the restraint body. Is anchored like an anchor and the restraint body receives earth pressure, so that a temporary embankment structure with high strength is obtained.
<D> Since the retentive sheet material is turned around the restraint body, it is possible to obtain the effect of preventing the restraint body from falling over, maintaining the restraint body shape, and suppressing slip collapse of the embankment portion.
<E> The reinforced embankment wall with high strength is removed because the folded portion of the backup sheet is removed, extended to the side of the reinforcing embankment wall, and connected to the wall surface material, so that the embankment and the restraint body become an integral structure to fix the wall surface material. It becomes.
<F> As described above, the separated sheet portion performs a function of connecting to the wall surface material and a function of reinforcing the embankment. Moreover, the part embedded and left in the embankment still fulfills the function of suppressing slippage collapse of the embankment part of the temporary embankment structure.
<G> Since a restraint body having water permeability is used, water from the natural mountain side can pass through the restraint body and be discharged.
<H> Since a large box-shaped restraint is used, construction efficiency is good, self-supporting stability is high, and construction is easy to perform.
<I> Packing filling materials such as earth and sand in a bag-like restraint body in advance allows it to be carried to the site and used for immediate construction.
<J> Sufficient compaction is possible up to the vicinity of the wall surface, and the wall surface is hardly deformed.
<K> By using the wall surface material of the steel net-like material having an L-shaped cross section, vegetation is possible, and the wall surface is highly weatherable and can be used as a reinforcing wall with a good landscape.

Hereinafter, based on the Example shown to a figure, the reinforcement embankment method concerning this invention is demonstrated in detail along construction order.
<1> Installation of refrigeration sheet material A refrigeration sheet material 2 is laid along the terrain from an existing slope, for example, a slope 1 that has collapsed due to an earthquake or the like, and is stretched away from the slope 1.
In the present invention, the existing slope includes not only a natural slope made by an earthquake but also a slope constructed by embankment.
As the recording sheet material 2, for example, a geogrid that is a net-like sheet made of synthetic resin through a steel core material can be used.

<2> Installation of Restraint Body A restraint body 3 having water permeability, which is a position appropriately spaced from the slope 1 and packed with a filling material such as earth and sand, is installed on the recording sheet material 2.
In the embodiment, the restraining bodies 3 are stacked in two stages.
The restraint body 3 is formed of, for example, polypropylene resin fiber, and is sewn into a box shape as shown in FIG.
Since it is the box-shaped restraint body 3, it is easy to pile up and is less likely to collapse.
The restraint 3 can be used for construction quickly even in the event of an emergency, by prepacking and storing earth and sand.
The filling material to be packed in the restraint body 3 is not limited to earth and sand, and can be packed by mixing a lightweight foam such as a solidified material and a foaming resin.
The upper part of the restraint body 3 is sealed like a drawstring stop.
This restraint body 3 will be located in the surface side of the temporary embankment structure 4 which performs emergency construction.
Since the restraint body 3 has water permeability, the water on the natural ground side is permeated and discharged to the outside of the embankment structure 4.

<3> Embankment Embankment 5 is applied behind the restraint 3, that is, on the existing slope 1 side.
The embankment 5 is not filled to the full height of the restraining body 3, but is filled up to, for example, the height of one stage of the restraining body 3 stacked in two stages. (Figure 2)
The back of the embankment 5 can be compacted to the limit of the restraining body 3 and deformation of the embankment 5 is difficult to occur.

<4> Folding of the backup sheet material The end portion of the backup sheet material 2 that extends to the opposite side of the slope 1 of the restraint 3 from the lower side of the restraint 3, that is, the temporary embankment The restraint 3 is wound around the surface of the structure 4.
Subsequently, the end portion of the recording sheet material 2 is folded back and extended toward the existing slope 1 side.
In this way, by turning the copy sheet material 2 around the restraint body 3, the function of preventing the tipping of the restraint body 3 is exhibited, and the shape holding function of the restraint body 2 is also exhibited.

<5> Embankment Embankment 5 is carried out on the folded part of the above-described recording sheet material 2. (Figure 3)
On the embankment 5, the copy sheet material 2 is laid and the restraint 3 is stacked.
Thereafter, the recording sheet material 2 is turned around and turned back as described above.
Since the recording sheet material 2 is sandwiched between the embankments 5 stacked one above the other, the sliding surface of the embankments 5 is blocked, and slippage of the embankments 5 is suppressed.

<6> Repetition of work The above work is repeated, the restraint bodies 3 are stacked, and the temporary embankment structure 4 is completed.
Since the provisional embankment structure 4 is completed, the stability of the slope is ensured, so that, for example, the road on the slope 4 can pass.
Further, the restraint body 3 is located on the surface side of the temporary embankment structure 4, and the restraint body 3 is subjected to earth pressure by being integrated with the embankment 5 by the anchor function of the recording sheet material 2, so that a strong reinforcing slope 4.

<7> Construction of Reinforced Embankment Wall The temporary sheet material 2 that has been turned around the restraint body 3 of the provisional embankment structure 4 constructed as described above is removed by means such as cutting at a portion exposed from the embankment 5, and the provisional embankment. It extends in a direction away from the structure 4.
The wall surface material 6 is connected to the removal end portion 2a of the removed backup sheet material 2 using a binding wire or the like. (Fig. 5)
In other words, the removal end portion 2a fulfills the connecting function with the wall surface material 6 and the reinforcing function of the embankment 7 described later. (Fig. 6)
In the embodiment, a member made of expanded metal having an L-shaped cross section as shown in FIG. 9 is used as the wall material 6, but other flat wall materials 6 and various conventional wall materials can be used. is there.
Moreover, the part 2b left in the embankment 5 exhibits the effect of suppressing slippage of the embankment 5. (Fig. 6)

<8> Embankment The embankment 7 corresponding to the height of the wall surface material 6 is applied behind the wall surface material 6, that is, on the temporary embankment structure 4 side.
The embankment 7 is placed on the backup sheet material 2, and the load of the restraint body 3 and the embankment 5 behind it is acting on the reserve sheet material 2, so the embankment 5, the restraint body 3, the embankment 5, and the wall surface The material 6 functions as an integral structure, and becomes a reinforced embankment wall 8 with high strength.

<9> Stacking of wall surface material The wall surface material 6 is stacked on the embankment 7, and the recording sheet material 9 is laid behind and connected.
The embankment 7 is applied on the recording sheet material 9.
By repeating this, the reinforcing embankment wall 8 is formed to the required height.

<10> Repeating the operation After forming the reinforced embankment wall 8 to the required height, the holding sheet material 2 that has been turned around the restraint 3 is cut at an appropriate position, and its end is laid on the embankment 7.
The wall surface material 7 is connected to the end portion of the recording sheet material 2, the embankment 7, the installation of the wall surface material, and the embankment 7 are sequentially repeated to complete the reinforcing embankment wall 8. (Fig. 7)

In the above embodiment, a plurality of the restraining bodies 3 are shifted and installed, but the restraining bodies 3 may be stacked straight on the surface of the provisional reinforcing slope 4 as shown in FIG.
Moreover, in the above Example, after constructing the temporary embankment structure 4 to the predetermined height, the wall material 6 was arranged, and the embankment 7 was repeated between the structures 4, but the temporary embankment structure 4 is one step. Alternatively, it is possible to construct several stages, sequentially fill the wall 7 between the wall material 6 and the structure 4, and then further pile up the temporary bank structure 4.
Further, the reinforcing embankment method according to the present invention can be applied not only to a collapsed slope, but also to an existing slope formed by embankment on a flat ground.

Perspective view of the reinforced embankment construction method Cross section of construction sequence Cross section of construction sequence Cross section of construction sequence Cross section of construction sequence Cross section of construction sequence Cross section of construction sequence Perspective view of restraint Perspective view of wall material Cross-sectional view of another embodiment

Explanation of symbols

1: Existing slope 2: Retaining sheet material 3: Restraining body 4: Temporary embankment structure 5: Embankment 6: Wall material 7: Embankment 8: Reinforced embankment wall 9: Retaining sheet material

Claims (5)

For the planned position of the temporary embankment structure that is separated from the existing slope as appropriate, lay down the sheet material,
Similarly, install a water-permeable bag-like restraint filled with filling material at an appropriate distance from the slope,
The end of the sheet material is turned from the lower side of the restraint body to the surface side of the temporary embankment structure,
Fold it over to the existing slope side on the upper side,
Embedding on the folded portion of the recording sheet material,
A wall material to be a reinforcing embankment wall is appropriately separated from the temporary embankment structure,
Remove the folded portion of the backing sheet material and extend it to the reinforcing embankment wall side, and connect with the wall surface material,
A reinforced embankment method for embedding between the wall material and the temporary embankment structure. For the planned position of the temporary embankment structure that is separated from the existing slope as appropriate, lay down the sheet material,
Similarly, install a water-permeable bag-like restraint filled with filling material at an appropriate distance from the slope,
The end of the sheet material is turned from the lower side of the restraint body to the surface side of the temporary embankment structure,
Fold it over to the existing slope side on the upper side,
After repeating the embedding process on the folded portion of the recording sheet material, after embedding and stabilizing to a predetermined height,
A wall material to be a reinforcing embankment wall is appropriately separated from the temporary embankment structure,
Remove the folded portion of the backing sheet material and extend it to the reinforcing embankment wall side, and connect with the wall surface material,
Reinforced embankment method that repeats the process of embedding between the wall material and the temporary embankment structure.   The reinforcing embankment method according to claim 1 or 2, wherein a large-sized water-permeable bag-like member made of a resin fiber is used as the restraint.   The reinforcing embankment method according to any one of claims 1 to 3, wherein a geogrid is used as the recording sheet material.   The reinforcing embankment method according to any one of claims 1 to 4, wherein a steel mesh material bent so as to have an L-shaped cross section is used as the wall surface material.

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