JP5100513B2 - Reinforced earth wall and its construction method - Google Patents

Description

  The present invention relates to a reinforced soil wall using a soil wall structure packed with a filling material such as earth and sand, and a method for constructing the reinforced soil wall.

Various means have been developed as means for constructing reinforced soil walls for slope reinforcement.
For example, as disclosed in Japanese Patent Application Laid-Open No. 2005-155191, a small steel wall surface material is installed along an existing slope, and embedding behind it, and this is repeated several times to reinforce the earth wall. There is a way to build.
In such a method, the wall material is piled up several times, and the embankment must be repeated each time, so that the construction period becomes longer.
Therefore, this method is not suitable for a site that requires emergency restoration work where a slope collapse has occurred.

On the other hand, there is a means disclosed in Japanese Patent Application Laid-Open No. 2008-50940 as a means for constructing a reinforced earth wall that requires an emergency.
The invention of this publication uses a sandbag filled with a filling material such as earth and sand, and piles them up on the front surface of the embankment to construct a reinforced earth wall.
Such a sandbag is not sufficiently integrated with the embankment behind it, and only the weight of the sandbag receives the earth pressure, so there is a risk that the wall will collapse if there is a large load.
In addition, woven fabrics such as synthetic resin fibers used for sandbags are not very weatherproof, and when exposed to sunlight or wind and rain, the strength of sandbags decreases and the possibility of breakage increases.
JP 2005-155191 A JP 2008-50940 A

  The problem to be solved by the present invention is to provide a reinforced soil wall that can be employed for urgent construction and also has an integrated backfill, and a construction method thereof.

The reinforced earth wall according to the present invention is a structural member including a bag body made of a sheet material, in which the earth wall structure body in which the filling material is packed in the bag body is stacked, and a part of the structural member is attached in the vicinity of the opening. A flexible suspension belt with one end removed or a flexible lid attached in the vicinity of the opening, the tip of the lid covering the opening being Lay it on the back embankment and sandwich it between the embankments .
Another reinforcing earth wall according to the present invention is a structure in which a supporting member is attached to an end portion of a suspension belt extended on the embankment .
Another reinforcing earth wall according to the present invention has a surface wall constructed on the front surface of the piled earth wall structure.
In the other reinforced earth wall according to the present invention, the surface layer wall is made of a cemented hardened material sprayed wall, a concrete panel, or a pseudo-wood panel.

The method for constructing a reinforced earth wall according to the present invention is a method for constructing a reinforced earth wall using a structural member including a bag and a suspension belt,
Fill the inside of the bag of the structural member with a filling material to make an earthen wall structure,
Install the earth wall structure on the terrain, fill it behind it,
Of the two ends of the suspension belt of the earth wall structure, remove one end from the bag and extend it on the embankment,
A reinforced soil wall is constructed by repeatedly stacking a soil wall structure on the soil wall structure, embedding behind the soil wall structure, and laying the removed suspension belt on the embankment.
Another method for constructing a reinforced earth wall according to the present invention is a method for constructing a reinforced earth wall using a structural member including a bag and a lid,
Fill the inside of the bag of the structural member with a filling material to make an earthen wall structure,
Install the earth wall structure on the terrain, fill it behind it,
Extending the tip of the lid covering the opening of the earth wall structure onto the embankment,
A reinforced soil wall is constructed by repeatedly stacking a soil wall structure on the soil wall structure, embedding behind it, and laying a lid on the embankment.

The present invention has the above-described configuration and achieves at least one of the following effects.
<a> Since the earth wall structure is provided with a suspension belt, the earth wall structure can be lifted with a crane or the like to be easily transported and installed.
<B> By forming the earthen wall structure bag body into a rectangular box shape, it is possible to sit well when installed and stacked.
<C> Because the reinforced earth wall can be constructed simply by filling the earth wall structure with padding material such as earth and sand, and then repeating the embankment, it can also be used for urgent construction and enables quick restoration work. .
<D> One end of both ends of the suspension belt of the earth wall structure is cut off from the restraint body, or a lid covering the opening is laid on the embankment and embanked on the earth wall. In addition to preventing the structure from overturning, the belt is sandwiched by the load of the embankment, the embankment and the earth wall structure are integrated, and the upper and lower embankments are also integrated, making it possible to construct a large integrated reinforced earth wall .
<E> By suspending and embedding a suspension belt and a lid on the embankment, the earth wall structure is prevented from falling during the construction, and the shape is maintained, and slip collapse of the embankment portion is suppressed.
<F> Even after the completion of construction, it functions to suppress the collapse of the embankment and functions as an embankment reinforcement such as a geotextile separately laid on the embankment.
<G> Since the suspension belt and the lid also function as the embankment reinforcing material, the use of the embankment reinforcing material can be omitted depending on conditions such as local soil conditions, embankment shape, embankment height, and front slope. Therefore, the workability is better and more economical than the conventional reinforced embankment.
<H> By using the suspension belt and lid used for transportation also as a member integrated with the embankment, efficient construction without waste can be performed quickly.
<I By constructing the surface layer wall on the front surface of the piled earth wall structure, it is possible to protect the bag body made of the sheet material, and it can be constructed as a long-term reinforced earth wall.
<J> By attaching the bearing plate to the tip of the suspension belt, the reinforced earth wall and the embankment can be more integrated.

<1> Earth wall structure The earth wall structure B is a structure member C filled with a filling material 3. The structure member C includes a bag body 1 and a suspension belt 2 attached to the bag body 1. It consists of two.
The bag body 1 is formed of a sheet material such as a woven fabric woven with synthetic resin fibers such as polyethylene resin, for example, and has a rectangular box-shaped bag shape with the upper side opened as shown in FIG.
The attachment portions 5 and 5 at both ends of the suspension belts 2 and 2 whose middle portions are folded back to the right and left in the embodiment, near the opening above the bag body 1 are attached by sewing or the like.
The suspension belt 2 is also formed of a woven fabric woven with synthetic resin fibers.

<2> Filling material Filling material 3 is packed in the bag 1 of the structural member C.
As the filling material 3, in addition to the earth and sand, a material obtained by mixing a foaming resin or a hardener with the earth and sand can be used.

<3> Installation The earthen wall structure B in which the bag body 1 is filled with the filling material 3 is installed at the planned construction position of the reinforced earth wall A of the terrain.
The bag 1 is installed by holding the suspension belts 2 and 2 with a crane.
At this time, the left and right attachment portions 5 and 5 at both ends of the suspension belt 2 are separated in the thickness direction of the reinforcing earth wall A.

<4> Embankment The embankment 4 is applied behind the bag body 1 of the earth wall structure B by the same height as the upper end of the bag body 1.

<5> Laying of the suspension belt Of the attachment portions 5 and 5 at both ends of the suspension belt 2 attached to the bag body 1, the vicinity of the attachment portion 5 on the front side of the reinforcing earth wall A is cut.
The separated suspension belt 2 is laid on the embankment 4 from the other attachment portion 5.

<6> Stacking of bags The soil wall structure B packed with the filling material 3 is installed and stacked on the bag body 1 of the soil wall structure B that has already been installed.
When the upper part of the bag body 1 of the earth wall structure B is opened, the filling material 3 is exposed, and when the bag body 1 is placed on this, the filling material 3 becomes a slip stopper. The upper and lower bag bodies 1.1 do not slide sideways.

<7> Laying the embankment / suspension belt Fill the embankment 4 behind the stacked bags 1, and sandwich the suspension belt 2 laid on the embankment 4 behind the lower pouch 1 between the embankments 4, 4. To.
The suspension belt 2 prevents the earth wall structure B from falling and maintains its shape, while suppressing the slip collapse of the embankment 4 portion.
Next, in the same manner as described above, one end portion of the suspension belt 2 of the bag body 1 that is on the upper side is cut and laid on the embankment 4.

<8> Repeat The above-described installation of the bag body 1, the embankment 4, and the laying of the suspension belt 3 are repeated, and the earth wall structure B is piled up to a required height to construct the reinforced earth wall A.
After the completion of construction, the suspension belt 2 functions to suppress the slippage of the embankment. Depending on the conditions of the soil, the shape of the embankment, the height of the embankment, the slope of the front surface, etc. In some cases, it may not be necessary to use an embankment reinforcement.

As described above, the reinforced earth wall A is formed by stacking the earth wall structure B. As shown in FIG. 5, the mortar 6 which is a cement hardening material is sprayed on the front surface of the stacked bag body 1 to form a surface layer. The wall 7 may be formed.
The surface layer wall 7 prevents the bag body 1 from being exposed to sunlight and wind and rain, and prevents deterioration.
Moreover, the landscape of the reinforced earth wall A is improved.
In addition, as the surface layer wall 7, it is possible to employ a configuration in which a concrete outer wall material, a concrete artificial tree, or the like is employed and a cement-based hardener such as mortar is packed between the bag body 1.

As shown in FIG. 6, the end of the suspension belt 2 laid on the embankment 4 is passed through a rectangular bearing plate 8 to form a knot, and may be embedded in the embankment 4 without being pulled out.
The pulling-out resistance in the embankment 4 of the suspension belt 2 increases, and integration of the embankment 4 and the bag body 1 improves.
In the above embodiment, the upper portion of the bag body 1 is opened, but as shown in FIG. 3, a lid body 9 formed of a woven fabric is attached.
The opening is covered with the lid 9, and the tip is stretched as it is on the back embankment 4, and the embankment 4 is further formed thereon, so that the earth wall structure B can be prevented from falling and maintained in shape.
In the embodiment of FIG. 3, the suspension belt 2 and the lid body 9 are attached. However, when the lid body 9 is sandwiched in the embankment 4 to prevent falling, the structural member C without the suspension belt 2 may be used. is there.

FIG. 7 shows an embodiment in which the geotextile 10 is laid in the embankment 4 together with the suspension belt 2 and the lid body 9 and used together.
FIG. 8 shows an example in which the earth wall structures B are not stacked on top of each other but are stacked little by little.

Explanatory drawing of construction state of reinforced earth wall construction method Perspective view of one embodiment of bag Perspective view of another embodiment of bag Cross section of one embodiment of reinforced soil wall Sectional view of another embodiment of reinforced earth wall Perspective view of bearing plate Sectional view of another embodiment of reinforced earth wall Sectional view of another embodiment of reinforced earth wall

Explanation of symbols

A: Reinforced earth wall B: Earth wall structure C: Structural member 1: Bag 2: Suspension belt 3: Filling material 4: Filling 5: Mounting part 6: Mortar 7: Surface wall 8: Bearing plate 9: Lid 10: Geotextile

Claims (7)

A structural member including a bag made of a sheet material, and stacking a soil wall structure packed with a filling material in the bag,
Reinforced soil that is a flexible suspension belt attached near the opening of the structural member, the suspension belt from which one end is removed being laid on the back embankment and sandwiched between embankments wall. A structural member including a bag made of a sheet material, and stacking a soil wall structure packed with a filling material in the bag,
A flexible lid attached in the vicinity of the opening of the structural member, the tip of the lid covering the opening being laid on the back embankment and sandwiched between the embankments Reinforced earth wall. The end portion of the hanging belt stretched over the embankment, a reinforced soil wall according to claim 1, characterized in that fitted with Bearing member. The reinforced earth wall according to any one of claims 1 to 3 , wherein a surface layer wall is constructed on the front surface of the piled earth wall structure. The reinforced earth wall according to claim 4 , wherein the surface layer wall is constructed of a cement-based hardened material sprayed wall, a concrete panel, or a pseudo-wood panel. A method of constructing a reinforced earth wall using a structural member including a bag and a suspension belt,
Fill the inside of the bag of the structural member with a filling material to make an earthen wall structure,
Install the earth wall structure on the terrain, fill it behind it,
Of the two ends of the suspension belt of the earth wall structure, remove one end from the bag and extend it on the embankment,
A method for constructing a reinforced soil wall, wherein a reinforced soil wall is constructed by stacking a soil wall structure on the soil wall structure, embedding behind the soil wall structure, and laying the removed suspension belt on the embankment. A method of constructing a reinforced earth wall using a structural member including a bag and a lid,
Fill the inside of the bag of the structural member with a filling material to make an earthen wall structure,
Install the earth wall structure on the terrain, fill it behind it,
Extending the tip of the lid covering the opening of the earth wall structure onto the embankment,
A method for constructing a reinforced soil wall, wherein a reinforced soil wall is constructed by stacking a soil wall structure on the soil wall structure, embedding behind the soil wall structure, and laying a lid on the embankment.

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