JP5913701B1 - Temporary dual-use main soil structure and its construction method - Google Patents

Abstract

[PROBLEMS] To provide a temporary and combined type permanent earth structure that can be transferred to a permanent structure having high seismic performance by simple construction while using a temporary structure constructed in a short period of time. SOLUTION: A temporary soil structure 20 configured by stacking a plurality of large canisters 21, 25 in the vertical and horizontal directions, a buffer layer 30 covering a side surface of the temporary soil structure 20, and a surface of the buffer layer 30 are covered. The permanent soil structure 10 is constituted by the retaining wall 40. [Selection] Figure 1

Description

The present invention relates to a soil structure applicable to roads, railways, embankments, sabo dams, etc., and in particular, a permanent structure having high seismic performance by simple construction while using a temporary structure constructed in a short period of time. The present invention relates to a temporary and permanent permanent soil structure that can be transferred to and a construction method thereof .

When a supporting ground such as a road collapses during a disaster such as a large typhoon or a large-scale earthquake, it is known that a temporary structure is constructed by stacking a plurality of sandbags as an early restoration method.
Patent Document 1 discloses a temporary structure that is constructed by stacking rectangular large sandbags having a large compressive strength on the side of the embankment.
Patent Document 2 discloses a temporary structure constructed by sticking bar-shaped reinforcing materials between a plurality of stacked large sandbags.

Japanese Patent Laying-Open No. 2008-57285 (FIG. 4) JP 2010-77639 A (FIG. 1)

The prior art described above has the following problems.
<1> Since the earth structure has separate design guidelines for the temporary structure and the permanent structure, the temporary and permanent type permanent earth structure that can be converted into the permanent structure by utilizing the entire temporary structure. There are no examples of implementation of objects.
Until now, the temporary structure has been completely removed, and the existing structure has been newly installed. There is room for improvement not only in terms of construction cost but also in terms of construction period.
<2> From the viewpoint of early recovery, there are no questions about the nature and state of filling materials such as earth and sand and aggregates to be packed, and large soil bags using various filling materials that can be procured locally. Is made.
The large sandbag manufactured in this way tends to displace the filling material in the large sandbag when a large external force is applied due to an earthquake or the like after the construction of the temporary structure, and the temporary structure tends to be deformed.
<3> The large sandbag is still exposed on the side surface of the temporary structure.
Even if the bag is made of a weather-resistant material, it is difficult to maintain the strength of the temporary structure over a long period of time due to aging deterioration due to ultraviolet rays or damage from flying objects.
<4> Therefore, in order to protect the large sandbag, a method of spraying concrete on the side surface of the temporary structure and covering it with a hard lining layer can be considered.
Since the hard lining layer is constructed integrally with the temporary structure, there is a risk that the hard lining layer will be cracked or damaged if the filling material is displaced during an earthquake.

The present invention has been made in view of the above points, and the object of the present invention is to use a temporary structure constructed in a short period of time and to a permanent structure with high seismic performance by simple construction. An object of the present invention is to provide a temporary and combined type permanent soil structure that can be transferred and a method for constructing the same.
Another object of the present invention is to provide a temporary and combined type permanent earth structure and a method for constructing it, which can reduce the construction cost of the temporary structure and the permanent earth structure, and can greatly shorten the construction period. is there.

The present invention is a temporary and combined type permanent soil structure for constructing a permanent structure using a temporary structure, and a temporary soil structure configured by stacking a plurality of large-sized roofs vertically and horizontally. A buffer layer that covers the side surface of the temporary soil structure in layers, and a retaining wall that covers the surface side of the buffer layer, and the large body is filled with the bag body and the bag body densely. It is characterized by being composed of a granular high quality filling material enclosed .
In another embodiment of the present invention, the temporary soil structure is constituted by a plurality of large-sized containers stacked in the vertical and horizontal directions, and a buffer layer covering the side surfaces of the plurality of large-sized containers via wall materials, You may comprise so that a part of wall surface material may be located between a buffer layer and a retaining wall, and may hold | maintain a buffer layer.
In another embodiment of the present invention, at least one side surface of the temporary soil structure is covered with two layers of a buffer layer and a retaining wall.
In another embodiment of the present invention, a single or a plurality of restraining bands are additionally provided so as to horizontally traverse the temporary soil structure between a plurality of stacked large sandbags constituting the temporary soil structure. May be.
In another embodiment of the present invention, a simple road surface may be formed on the upper surface of the temporary soil structure.
In another embodiment of the present invention, a road bed may be formed on the upper surface of the temporary soil structure.
Furthermore, the present invention is a method for constructing a temporary and combined type permanent soil structure that constructs a permanent structure using a dam body-shaped temporary structure, and stacks a plurality of large ridges vertically and horizontally. A temporary soil structure is constructed, and the large gutter is composed of a bag body and a granular high-quality filling material that is densely filled and enclosed in the bag body, and a side surface of the temporary soil structure. Is covered with a layered buffer layer, and the surface side of the buffer layer is covered with a retaining wall to construct a permanent soil structure.
In another embodiment of the present invention, the temporary soil structure is constituted by a plurality of large-sized containers stacked in the vertical and horizontal directions, and a buffer layer covering the side surfaces of the plurality of large-sized containers via wall materials, The buffer layer may be held by a wall surface material positioned between the buffer layer and the retaining wall.
In another aspect of the present invention, a single or a plurality of restraining bands are provided between a plurality of stacked large sandbags constituting the temporary soil structure in a transverse direction, a longitudinal direction, or both directions of the temporary soil structure. It may be additionally provided.

The present invention has the following effects.
<1> While using a temporary structure constructed in a short period of time, it is possible to shift to a permanent structure with high seismic performance by simple construction.
<2> Since the permanent earth structure can be constructed using the temporary structure as it is, the construction cost of the permanent earth structure can be reduced and the construction period can be greatly shortened.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which concerns on Example 1 of this invention, and is a perspective view of the temporary earth type permanent earth structure which abbreviate | omitted one part Explanatory drawing of construction method of temporary soil structure Cross section of the completed temporary soil structure Sectional view of the temporary soil structure with the side of the temporary soil structure covered with a buffer layer Cross section of the completed main soil structure It is explanatory drawing which concerns on Example 2 of this invention, and is a perspective view of the temporary earth structure which abbreviate | omitted one part In the explanatory drawing which concerns on Example 2, the perspective view of the permanent earth structure which abbreviate | omitted one part It is explanatory drawing which concerns on Example 3 of this invention, and is partial sectional drawing of the permanent earth structure of temporary and combined type | mold It is explanatory drawing which concerns on Example 4, (A) is a fragmentary sectional view of a temporary earth structure, (B) is a fragmentary sectional view of a permanent earth structure

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

[Example 1]
<1> Temporary Combined Type Main Soil Structure Referring to FIG. 1, a temporary combined type permanent soil structure 10 according to the present invention is configured by stacking a plurality of large-sized roofs vertically and horizontally. The temporary earth structure 20 to be provided, the buffer layer 30 that covers the side surface of the temporary earth structure 20, and the retaining wall 40 that covers the surface of the buffer layer 30 are provided.
In this example, a case will be described in which the temporary and combined type permanent soil structure 10 is used as a roadbed for an automobile or a railway.

<2> Temporary soil structure The temporary soil structure 20 is an aggregate of a plurality of large sandbags, and in this example, the lower half layer of the temporary structure 20 is a flat large soil bag 21 having a cushion shape or a substantially columnar shape. The case where it comprises and the upper half layer of the temporary structure 20 is comprised with the square-shaped large sandbag 25 which exhibits a cube shape or a column shape is demonstrated.
These large sized doors 21 and 25 are sheet materials having excellent durability and weather resistance, and a planar shape formed by filling a bag body formed in a purse-like shape, a cylindrical shape or a square shape with 1 ton or more high-quality filling material is 1 m. The above refers to a soil structure having a height of about 20 cm to 100 cm.
In this example, the planar shape (landing area) of the flat large sandbag 21 is larger than the square large sandbag 25.
“Good quality filling material” refers to a filling material whose quality, such as density, weight, and hardness by compaction, is controlled.

<2.1> Flat large sandbag Flat large sandbag 21 is a sandbag for unevenness adjustment, and is configured by filling a perforated bag body 22 having a purse-like shape with a high-quality coarse filling material 23.
The bag body 22 is made of a resin net excellent in durability, weather resistance, UV resistance, and the like, and the coarse filling material 23 can be enclosed by closing the upper opening of the bag body 22 with a string or the like.
As the coarse grain filling material 23, coarse aggregates having a large diameter, such as high-quality cobblestones, crushed stones, and concrete glass, can be used.

  In producing the flat large sandbag 21, it is necessary to use a good quality coarse grain filling material 23, and to prevent excessive cavities and voids from remaining in the interior, for example, by giving vibrations or rolling the coarse grains. It is important to enclose the filling material 23 densely.

<2.2> Square Large Soil Box The rectangular large soil cup 25 is composed of a rectangular box 26 and a fine fine filling material 27 filled in the box 26.
The box 26 is made of, for example, a resin sheet having excellent weather resistance and durability, and the upper opening of the box 26 can be closed with a lid sheet, and the fine grain filling material 27 can be constrained and sealed.
The box 26 may be a bag called a “container bag” that can be filled with about 1 ton of earth and sand, for example, with a suspension belt.
As the fine grain filling material 27, for example, high-quality earth and sand or sand can be used.

  In producing the large square sandbag 25, the fine grain filling material 27 is used, and in order to prevent excessive cavities and voids from remaining in the interior, for example, vibration or rolling is applied to the fine grains. It is important to enclose the filling material 27 densely.

<3> Buffer Layer The buffer layer 30 is a granular layer formed between the side surface of the temporary structure 20 and the retaining wall 40, and has a deformation absorption function and a drainage function of the temporary structure 20.
As the material of the buffer layer 30, hard particles such as sand, earth and sand, gravel, and crushed stone can be used.

<4> Retaining Wall The retaining wall 40 is a protective layer formed of a cement-based material.
The retaining wall 40 includes a precast retaining wall block in addition to shotcrete and cast-in-place concrete.

[Method for constructing temporary soil structure]
The construction method of the temporary soil structure 20 will be described with reference to FIGS.

<1> Laying flat large sandbags Referring to FIG. 2, a plurality of flat large sandbags 21 are laid in the vertical and horizontal directions on the support ground G to be constructed without gaps to form the first layer.
Further, a plurality of flat large sandbags 21 are laid in the vertical and horizontal directions on the upper surface of the large sandbag 21 on the upper surface of the first layer and stacked in a trapezoidal cross section.
Similarly, a plurality of flat large sandbags 21 are stacked until the top surface is substantially horizontal.

Although this example shows a case where the support ground G is substantially horizontal, even when the support ground G is uneven or inclined, it is not necessary to level the support ground G as a horizontal plane before laying.
Due to the flexibility of the flat large sandbag 21, the upper surface of the square sandbag 25 can be laid horizontally by absorbing unevenness such as the inclination and unevenness of the support ground G.

  In addition, when the flat large sandbag 21 is laid, when a gap is generated between the flat large sandbags 21, it is preferable to fill this gap with a separate coarse filler 23 or earth and sand.

<2> Laying of large rectangular sandbags Referring to FIG. 3, a plurality of rectangular large sandbags 25 are laid in the vertical and horizontal directions on the horizontal upper surface of a plurality of flat large sandbags 21 to form the first stage.
Further, the rectangular large sandbags 25 are sequentially stacked on the upper surface of the first square large sandbag 25 until a predetermined height is reached, so that a temporary soil structure 20 having a substantially trapezoidal cross section is obtained.
When laying the rectangular large sandbag 25, if a gap is generated between the square large sandbags 25, it is preferable to fill this gap with a separate fine grain filling material 27, earth and sand, or the like.
The side surfaces of the plurality of flat large sandbags 21 and the plurality of rectangular large sandbags 25 stacked in this way form stepped step surfaces as a whole.

<3> Formation of a simple road surface When the temporary soil structure 20 is used as a roadbed, a simple road surface 28 such as a laid iron plate or asphalt pavement is formed on the upper surface of the temporary soil structure 20 as shown in FIG. Used as a running surface for various vehicles.
When the temporary soil structure 20 is used as a railway roadbed, the rail is laid after the road floor is formed on the upper surface of the temporary soil structure 20.
The usage of the temporary soil structure 20 is not limited to roads and railways, and a structure corresponding to the usage is constructed on the upper surface of the temporary soil structure 20.

  The load applied to the temporary soil structure 20 is supported by the supporting ground G through an assembly of a plurality of rectangular large sandbags 25 and an assembly of a plurality of flat large sandbags 21.

<4> Temporary protection of the side surface of the temporary soil structure On the side surface of the temporary soil structure 20, the bag body 22 of the flat large sandbag 21 and the box 26 of the rectangular large sandbag 25 are exposed.
If the use period of the temporary earth structure 20 is relatively short, the side surface of the temporary earth structure 20 may be left exposed. However, if the use period of the temporary earth structure 20 becomes long, as necessary. For example, as shown in FIG. 4, when the exposed side surface of the temporary soil structure 20 is covered with the buffer layer 30, the exposed side surface of the temporary soil structure 20 can be effectively protected from ultraviolet rays and flying objects.

<5> Seismic resistance of temporary soil structure A plurality of large sandbags 21 and 25 constituting the temporary soil structure 20 are manufactured by filling the bag body 22 or the box body 26 with high quality filling materials 23 and 27. It is a thing.
Therefore, even if a large external force is applied after the construction of the temporary soil structure 20 due to an earthquake or the like, the high quality coarse filling material 23 and the fine grain filling material 27 in the large soil bags 21 and 25 are difficult to displace. The simple road surface 28 of the structure 20 does not sink and the side surface of the temporary soil structure 20 does not squeeze out, and a stable posture can be maintained for a long period of time.

[Construction method of permanent soil structure]
The construction method of the permanent soil structure 10 based on the temporary soil structure 20 will be described with reference to FIGS.

<1> Formation of Buffer Layer With reference to FIG. 4, the exposed side surface of the temporary soil structure 20 is covered with the buffer layer 30. The covering thickness of the buffer layer 30 is appropriately selected.
When the buffer layer 30 is formed at the stage of constructing the temporary soil structure 20, a process for newly forming the buffer layer 30 is not necessary.

<2> Formation of Retaining Wall Referring to FIG. 5, the entire surface of the buffer layer 30 is covered with a retaining wall 40 having an appropriate layer thickness to obtain the permanent soil structure 10.
In constructing the permanent soil structure 10, all the temporary soil structure 20 is used and the side surface of the temporary soil structure 20 only needs to be covered with two layers of the buffer layer 30 and the retaining wall 40. Time and labor for dismantling and removing the object 20 are not required, and construction can be performed economically in a short period of time.

<3> Formation of roadbed When the main soil structure 10 is used as a roadbed, a roadbed 29 and a pavement 24 are formed on the upper surface of the main soil structure 10 as shown in FIG. It is used as a vehicle running surface.
When the permanent soil structure 10 is utilized as a railway roadbed, a rail is laid after a road floor is formed on the upper surface of the permanent soil structure 10.
The usage of the permanent soil structure 10 is not limited to roads and railroads, and a structure corresponding to the usage is constructed on the upper surface of the permanent soil structure 10.

<4> Protection of side surface of permanent earth structure The retaining wall 40 covers and protects the outer peripheral surface of the permanent earth structure 10.
Therefore, not only the appearance of the main soil structure 10 is improved, but also the retaining wall 40 functions as a blocking member for ultraviolet rays, preventing the buffer layer 30 from flowing out due to rain, and a protective member from flying objects.

<5> Seismic Resistance of Temporary Soil Structure The dual-purpose permanent soil structure 10 according to the present invention is constructed mainly of the temporary soil structure 20.
Therefore, in addition to the earthquake resistance that the temporary soil structure 20 has alone, the self-weight of the buffer layer 30 and the retaining wall 40 functions as a member that restrains the displacement of the side surface of the temporary soil structure 20. The earthquake resistance of 10 is higher than that of the temporary earth structure 20.
In particular, a part of the large sandbags 21 and 25 constituting the temporary soil structure 20 may be displaced due to a large earthquake. Even in such a case, since the buffer layer 30 absorbs this displacement, the retaining wall 40 is not cracked or broken.
Therefore, since the earthquake resistance of the permanent earth structure 10 is remarkably improved, the permanent earth structure 10 is effective against a large-scale earthquake and can be used as a permanent structure for a long time.

[Example 2]
In the following, modifications and other embodiments will be described. In the description, the same parts as those in the above-described embodiments will be denoted by the same reference numerals, and detailed description thereof will be omitted.

<1> Temporary Combined Type Main Soil Structure In this example, a temporary combined type permanent soil structure 10 constructed on an inclined land such as a coastline or a mountainous area will be described.
Referring to FIGS. 6 and 7, the temporary and combined type permanent earth structure 10 according to the present embodiment includes a temporary earth structure 20 configured by stacking a plurality of large sized soot vertically and horizontally, and temporary earth. A buffer layer 30 that covers one side surface of the structure 20 and a retaining wall 40 that covers the surface of the buffer layer 30 are provided.

<2> Temporary soil structure As shown in FIG. 6, in this example, the temporary soil structure 20 will be described as a case where the temporary soil structure 20 is configured by an aggregate of a plurality of flat large soil bags 21 having a cushion shape or a substantially columnar shape. It may be configured in combination with a rectangular large sandbag 25.
As the filling material of the flat large clay 21, any of the above-described high-quality coarse-grain filling material 23 or fine-grain filling material 27 can be used.
A plurality of flat large sandbags 21 are stacked in an up, down, left, and right direction on an inclined land to construct a temporary soil structure 20 having an inclined side surface, a simple road surface 28 is formed on the upper surface, and the temporary soil structure 20 is temporarily installed. Use as a roadway.

Since the characteristics such as earthquake resistance of the temporary earth structure 20 are as described in the first embodiment, the description thereof will be omitted.
Moreover, if a well-known drain material is arrange | positioned through the bottom part of the temporary earth structure 20, the drainage property of the temporary earth structure 20 can be improved.

<3> Main Soil Structure Referring to FIG. 7, one exposed side surface of the temporary soil structure 20 is covered with the buffer layer 30, and the entire surface of the buffer layer 30 is covered with the retaining wall 40. The main soil structure 10 is constructed.
In this example, one side of the temporary earth structure 20 is covered with the buffer layer 30 and the retaining wall 40.

<4> Effect of this example As a temporary structure on an inclined land, a reinforced embankment structure is known that is constructed by alternately and repeatedly laying a reinforcing material such as geogrid and embankment.
In the case of this reinforced embankment, it is necessary to cut the sloped land in advance and level the ground contact surface in a flat manner, which is heavy on both the construction cost and the construction period.
On the other hand, in the temporary and combined type permanent earth structure 10 according to the present embodiment, the temporary earth structure 20 and the permanent earth structure 10 can be directly constructed on an uneven slope.
Therefore, compared with the reinforced embankment structure which is a conventional structure, the burden of both sides of a construction cost and a construction period can be reduced significantly.

[Example 3]
<1> Temporary Combined Type Main Soil Structure In this example, when the temporary soil structure 20 is constructed by stacking a plurality of flat large sandbags 21 or a plurality of rectangular large sandbags 25 upward, the temporary soil structure 20 Another embodiment in which one or a plurality of restraining bands 50 are added to the main body will be described.

<2> Restraint Band The restraint band 50 is a restraint member for restraining the plurality of flat large sandbags 21 or the plurality of square large sandbags 25 stacked to reinforce the entire temporary soil structure 20.
As the restraint zone 50, for example, a particle layer such as a sediment layer, a crushed stone layer, or a gravel layer, or a hard plate such as a steel plate or a concrete plate can be applied.
When the restraint band 50 is installed in the horizontal transverse direction of the temporary soil structure 20, the formation time of the restraint band 50 is formed during the stacking work of the large sized doors 21 and 25, or after the temporary soil structure 20 is completed. Form.
As a method of forming the restraint band 50 after the temporary soil structure 20 is completed, when the restraint band 50 is a granular layer, for example, it may be filled through a filling casing or a pipe penetrating the temporary soil structure 20. .
When the restraining band 50 is a hard plate, the hard plate may be installed inside the temporary soil structure 20 by, for example, driving.

Furthermore, the arrangement direction of the restraint band 50 is not limited to the horizontal transverse direction of the temporary soil structure 20, and a plurality of restraint bands 50 may be additionally installed in the longitudinal direction of the temporary soil structure 20.
The “longitudinal direction” includes not only the vertical direction but also an oblique direction with respect to the temporary soil structure 20.
The restraining body 50 arranged in the longitudinal direction functions as a reinforcing member for increasing the horizontal shear strength of the temporary soil structure 20.
In other words, the restraining band 50 arranged in the longitudinal direction is such that a plurality of flat large sandbags 21 or a plurality of square large sandbags 25 that are stacked and exposed on the side surface of the temporary soil structure 20 protrude like a dharma drop. This is a horizontal displacement restraining member for restriction.
As the restraining band 50 disposed in the longitudinal direction, a belt material having flexibility, a steel rod having rigidity, various steel materials, and the like can be used.
As the installation form of the restraint band 50 arranged in the longitudinal direction, the large sandbags 21 and 25 are arranged to penetrate each other, or are arranged at the boundary between the large sandbags 21 and 25 without being penetrated.
The installation position of the restraining band 50 arranged in the longitudinal direction is appropriately selected in consideration of the usage of the temporary soil structure 20 and the like, but may be installed at least on the surface layer side of the side surface of the temporary soil structure 20.
Moreover, the full length has a dimension which can cross | intersect the some restraint band 50 arrange | positioned in the horizontal cross direction.
When the restraint band 50 arranged in the longitudinal direction intersects with another restraint band 50 arranged in the horizontal transverse direction, the restraint band 50 arranged in the longitudinal direction is fixed with tension or fixed without tension. .
The installation time of the restraint band 50 arranged in the longitudinal direction may be either during or after the construction of the temporary soil structure 20 according to the material of the restraint band 50.
In some cases, the restraint band 50 in the horizontal transverse direction is omitted, and only the restraint band 50 is installed in the longitudinal direction of the temporary soil structure 20.

<3> Effect of this example When the restraint band 50 is arranged in the horizontal transverse direction of the temporary soil structure 20, the restraint band 50 is formed by using the flat large sandbag 21 or a plurality of rectangular large sandbags 25 by using a loaded load. Since the upper and lower surfaces are forcibly restrained and the displacement of the filling material becomes difficult, the deformation prevention performance of the temporary soil structure 20 is enhanced.
Further, when the restraint band 50 is formed of a hard plate, the upper load can be distributed and transmitted to the lower large sandbags 21 and 25. Therefore, the temporary soil structure 20 or the main soil structure can be effectively utilized by utilizing its own weight. The stability of 10 is significantly improved.
Further, even when the quality of the filling material of the large soil bags 21 and 25 is not good, the restraint band 50 restrains these large soil walls 21 and 25 so as to effectively deform the temporary soil structure 20. Can be suppressed.
This example is effective as a reinforcing structure when the construction height of the temporary soil structure 20 or the permanent soil structure 10 is high.
In addition, when the restraint zone 50 is a granular layer, the restraint zone 50 also functions as a drainage layer.

  When the restraint band 50 is additionally arranged in the longitudinal direction of the temporary soil structure 20, the horizontal shear strength of the temporary soil structure 20 is further increased, so that the stability of the temporary soil structure 20 makes the restraint band 50 horizontal. This is not only improved compared to the case where it is arranged only in the transverse direction, but also ensures a stable posture guarantee period when used as the temporary earth structure 20 or the main earth structure 10.

[Example 4]
With reference to FIG. 9, another embodiment in which the buffer layer 30 is constructed using a plurality of wall materials 60 having a substantially L-shaped cross section will be described.

<1> Wall Surface Material The wall surface material 60 is a member formed by bending a strip such as an expanded metal or a welded wire mesh into a substantially L shape, and serves as a restraining tool for rolling the buffer layer 30 and the temporary soil structure 20. It functions as an anti-collapse material for the buffer layer 30 when used.
The wall material 60 includes a horizontal portion 61 and an upright portion 62 that is formed upright from one end of the horizontal portion 61.
The height of the upright portion 62 is, for example, substantially the same as the height of each large sandbag 21, 25, or has a length several times the height of each large sandbag 21, 25.
The dimension of the horizontal part 61 and the standing part 62 can be selected suitably.

<2> Construction of Temporary Soil Structure As shown in FIG. 9A, in this example, the case where the temporary soil structure 20 is composed of an assembly of a plurality of flat large sandbags 21 will be described. The object 20 may be composed of a plurality of rectangular large sandbags 25, or may be constructed by combining both large sandbags 21 and 25 as described above.

<2.1> Installation of Wall Material As a method of installing the wall material 60, when the large sandbags 21 (25) are sequentially stacked, the buffer layer 30 is placed while the wall material 60 is installed in front of the large sandbags 21 (25). Form hierarchically.
Specifically, a part of the horizontal portion 61 of the wall surface material 60 is placed on the upper surface of the exposed end of the uppermost large sandbag 21 (25), and fixed with a fixing pin or the like as necessary.
At this time, the upright portion 62 of the wall surface material 60 is separated from the front surface of the exposed end of the uppermost large sandbag 21 (25).
Next, hard particles such as sand, earth and sand, gravel, and crushed stone constituting the buffer layer 30 are squeezed out into a space formed between the wall material 60 and the exposed ends of the large sandbags 21 and 25 and rolled.
At this time, if necessary, an outflow prevention sheet such as a non-woven fabric is provided inside the upright portion 62 to prevent leakage of the hard particles.
Since the wall material 60 prevents the hard particles from collapsing, the buffer layer 30 that is sufficiently compacted can be formed.
The temporary earth structure 20 having a predetermined height is obtained by repeating the steps described above.
In the temporary soil structure 20 in which the construction has been completed, if the horizontal portion 61 of each wall surface material 60 is sandwiched between the upper and lower large sandbags 21 (25), the wall surface is utilized by utilizing the weight of the large sandbags 21 (25). The material 60 can be positioned so as not to be displaced.

<2.2> Protective structure of side surface of temporary soil structure During use of temporary soil structure 20, wall surface material 60 holds buffer layer 30 and prevents buffer layer 30 from flowing out due to rain, In cooperation with the layer 30, it also functions as a protective member that protects the side surface of the temporary earth structure 20 from flying objects and ultraviolet rays.

<3> Construction of permanent earth structure A method for constructing the permanent earth structure 10 based on the temporary earth structure 20 will be described with reference to FIG.
The permanent soil structure 10 can be constructed by a simple process of constructing the retaining wall 40 made of precast block or cast-in-place concrete over the entire surface of the upright portion 62 of the wall material 60.

<4> Effects of this example In this example, in addition to obtaining the same effects as those of the first embodiment, the temporary soil structure 20 is replaced with the buffer layer 30 and the wall surface when the temporary soil structure 20 is constructed. Since it can be protected by the material 60, the stability of the temporary soil structure 20 is further improved.
Furthermore, when constructing the permanent soil structure 10, it is only necessary to construct the retaining wall 40, so that the construction period of the permanent soil structure 10 can be shortened as compared with the embodiment described above.

DESCRIPTION OF SYMBOLS 10 ... Main soil structure 20 ... Temporary soil structure 21 ... Flat large soil container 22 ... Bag body 23 ... Coarse grain filling material 25 ... Square large soil container 26 ... Box 27 ... Fine grain filling material 28 ... Simple road surface 29 ... Road bed 30 ... Buffer layer 40 ... Retaining wall 50 ... Restraint band 60 ... Wall material

Claims (9)

Temporary combined type permanent earth structure that constructs a permanent structure using a temporary structure,
A temporary soil structure constructed by stacking a plurality of large containers vertically and horizontally;
A buffer layer covering the side surface of the temporary soil structure in layers;
A retaining wall covering the surface side of the buffer layer ;
The large cup is composed of a bag body and a granular high quality filling material that is packed and enclosed in the bag body ,
Temporary combined type permanent soil structure.   The temporary soil structure is composed of a plurality of large walls stacked vertically and horizontally, and a buffer layer covering the side surfaces of the plurality of large walls via a wall surface material, and a part of the wall surface material is a buffer layer The temporary and combined type permanent soil structure according to claim 1, wherein the buffer layer is held between the retaining wall and the retaining wall.   The temporary and combined type permanent earth structure according to claim 1 or 2, wherein at least one side surface of the temporary earth structure is covered with two layers of a buffer layer and a retaining wall.   Between a plurality of stacked large sandbags constituting the temporary soil structure, a single or a plurality of restraining bands are additionally provided in the transverse direction, longitudinal direction, or both directions of the temporary soil structure. The temporary and combined type permanent soil structure according to any one of claims 1 to 3, wherein   The temporary and combined type permanent soil structure according to any one of claims 1 to 4, wherein a simple road surface is formed on an upper surface of the temporary soil structure.   The temporary and combined type permanent soil structure according to any one of claims 1 to 4, wherein a roadbed is formed on an upper surface of the temporary soil structure.   A construction method of a temporary and combined type permanent soil structure that constructs a permanent structure using a levee-shaped temporary structure,
  Build a temporary soil structure by stacking multiple large containers vertically and horizontally
  The large bowl is composed of a bag body and a granular high-quality filling material that is filled and enclosed in the bag body,
  The side surface of the temporary soil structure is covered with a layered buffer layer,
  A main soil structure is constructed by covering the surface side of the buffer layer with a retaining wall,
  A method for constructing a temporary and permanent permanent soil structure.   The temporary soil structure is composed of a plurality of large walls stacked in the vertical and horizontal directions, and a buffer layer that covers the side surfaces of the plurality of large walls via a wall material, and between the buffer layer and the retaining wall. The method for constructing a temporary and combined type permanent soil structure according to claim 7, wherein the buffer layer is held by the positioned wall surface material.   Between a plurality of stacked large sandbags constituting the temporary soil structure, a single or a plurality of restraining bands are additionally provided in the transverse direction, longitudinal direction, or both directions of the temporary soil structure. 9. The construction method of a temporary and permanent type permanent soil structure according to claim 7 or 8,

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