JP3519725B1 - Slope reinforcement embankment method - Google Patents

Abstract

[PROBLEMS] To provide a construction method that simultaneously realizes reinforcement of a bank in the horizontal direction and reinforcement of slope protection, even when using a banking material having a soil property that easily causes erosion or collapse. SOLUTION: A net is laid horizontally on a ground or an embankment, and an embankment is constructed thereon. Thereafter, the net is laid horizontally at a constant embankment height, and the embankment is repeated. In this method, a net is attached along the side of the embankment in accordance with the slope of the slope, and the end of the net laid horizontally and the net for forming the slope are connected and integrated. As the reticulated body, it is preferable to use a plastic reticulated body that has been subjected to a uniaxial or biaxial stretching treatment. Further, a planar drainage material may be further laid on at least one layer between the horizontally laid nets, and the vegetation sheet may be covered on the embankment side of the slope forming net for embankment. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slope reinforcement embankment method for constructing and reinforcing an embankment using a mesh body.

[0002]

TECHNICAL BACKGROUND OF THE INVENTION It is difficult to construct a strong road or land by embankment using soil of a soil that is likely to be eroded or collapsed by slight rainfall as represented by Masa and Shirasu. . Therefore, conventionally, after forming the slope of the embankment, the land has been constructed by stacking slopes such as precast concrete frames. However, the construction method for constructing the slope and the embankment by using this precast concrete frame construction requires a long construction period and becomes costly, so that the development of a new construction method has been required. ．

[0003]

[Patent Document 1] Japanese Patent Laid-Open No. 3-51423

[Patent Document 2] Japanese Utility Model Laid-Open No. 6-40039

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a construction method for simultaneously achieving horizontal embankment reinforcement and slope protection reinforcement even when using a soil embankment material that is prone to erosion and collapse. To

[0005]

That is, according to the present invention, a net-like body is laid horizontally on the ground or on the embankment and 45 is placed on the net-like body.
° Embankment with a gentler slope is constructed , compacted by compaction , and then a net is laid horizontally at a certain embankment height to form the embankment .
Repeat the rolling compaction, and make another according to the slope of the slope to be constructed.
Of the mesh body is attached along the side surface of the embankment, and the end of the horizontally laid mesh body and the slope forming mesh body are
Meshes of each other and meshes formed on each other
By inserting a rod-shaped body into the space between the eye materials,
The present invention relates to a slope reinforcement embankment method characterized by being fixed and integrated.

As the net-like body, it is preferable to use a plastic net-like body that has been stretched uniaxially or biaxially. In this method, it is effective to reinforce the embankment by laying a planar drainage material horizontally on at least one layer between the horizontally laid reticulate bodies, and also covering the embankment side of the slope forming net with a vegetation sheet. By embankment, it is effective not only for greening the slope but also for reinforcing and protecting the slope.

[0007]

DETAILED DESCRIPTION OF THE INVENTION Next, the embankment method according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic sectional view for explaining an example of the embankment method of the present invention. First, on the ground where we are going to embank,
Alternatively, the mesh body 1 is laid horizontally over a predetermined area on the already-prepared embankment, and the embankment 2 having a slope less than 45 ° is applied on the mesh body 1 and the embankment body is solidified while sequentially rolling. At this time, the mesh body 1 may be fixed by the anchor pin 3 or the like, if necessary. When the embankment 2 reaches a predetermined height, for example, 1 m, the reticulate body 1 is laid horizontally again and the embankment 2 is repeated,
This operation is performed as many times as necessary to construct a multi-tiered embankment.
The mesh body 1 laid here can firmly reinforce the embankment.

At this time, depending on the soil quality of the embankment material 2, the planar drainage material 4 may be laid horizontally in the middle of the mesh bodies 1 or over the mesh body 1. At this time, the planar drainage material 4 may be laid at a required place, for example, the planar drainage material 4 is horizontally provided on at least one layer between the mesh bodies 1 laid horizontally and the mesh body 1. The sheet drainage material 4 may be laid horizontally between all the mesh bodies. Further, the planar drainage material 4 may be laid horizontally on at least one layer of the mesh body 1, or the planar drainage material 4 may be laid horizontally on all the mesh bodies 1. Figure 1
Shows the situation in which the planar drainage material 4 is laid horizontally in the middle of all the mesh bodies 1.

The rainwater that invades the embankment due to the
Since the surface drainage material 4 drains the water early, the embankment can be reinforced more strongly. As an example of such a planar drainage material, a thick fiber sheet such as a non-woven fabric or a plastic planar drainage material such as Caldrain manufactured by Mitsui Chemicals, Inc. can be used.

On the other hand, on the side surface of the embankment 2, another mesh body 5 is prepared, shaped according to the slope of the designed slope, and the mesh body 5 is attached along the side surface of the embankment to form the slope surface. To form. At this time, the mesh body 5 may also be fixed by a wire anchor or the like, if necessary. The slope forming net 5 not only forms and reinforces the slope but also protects the slope from erosion by rainwater or the like.

When forming a slope, it is desirable to advance the embankment after stacking a vegetation sheet or the like 6 on the inside of the slope forming net 5, that is, on the side of the embankment, and the vegetation sheet is not particularly limited. Instead, a commercial product can be used.
Since the vegetation sheet 6 allows rainwater to flow along the sheet in the early stage of construction, it is effective in protecting slopes that have not yet solidified, and the slopes completed after the construction have an effect of preventing erosion by raindrops. It is possible to stabilize the embankment slope in an early stage by growing a plant that exhibits the slope and protects the slope. The net-like body 5 also has an effect of bringing the vegetation sheet 6 into close contact with the slope.

Reticulate body 1 and reticulate body 5 used in this method
May be a metal net structure such as an ordinary wire mesh or a welded wire mesh, or a net-like object such as a woven or knitted product manufactured from synthetic fibers, or a net structure manufactured from plastic. It may be. As an example of the synthetic fiber net-like material, there can be mentioned, for example, Madem Kosen Co., Ltd. product trade name Adem G-50, which is manufactured from high-strength fiber and whose mesh is formed into a square shape.

Of these, net structures made of plastics such as polyethylene and polypropylene that are not easily attacked by acidic or alkaline soil are more preferable.
As an example of this, a plastic net structure is shown in FIG. 2, which is a plastic net that has been stretched in the longitudinal direction, and in which the vertical axis member and the horizontal axis member are integrated at the intersections. , Has a particularly high tensile strength in the stretching direction. Alternatively, the net structure may be stretched in two directions, the longitudinal direction and the width direction, and such a net structure exhibits strong strength in both directions. The net-like body having this net structure has a strong soil restraining force, a high reinforcing effect on the embankment body, and is lightweight, so that work efficiency can be improved. As an example of such a plastic net-like material, Mitsui Chemicals Co., Ltd. product trade name Tencer SR3
5 can be mentioned.

The reticulated body 1 and the reticulated body 5 for forming a slope may be the same reticulated body laid horizontally.
It may be different. The two are connected by connecting the end portion of the mesh body 1 and the mesh body 5 located at substantially the same height as the end portion. The connection is performed by the following methods referred.

When the reticular body 1 laid in the horizontal direction and the reticulated body 5 for forming the slope are made of a uniaxially stretched plastic reticulated body as shown in FIG. The connection method of is shown in FIG. That is, the mesh material of the mesh body 5 and the mesh material of the end portion of the mesh body 1 are engaged with each other, and the space between the mesh materials formed therein is made of plastic or metal, and the mesh material is It is possible to adopt a method of inserting the rod-shaped body 7 having a durability substantially equal to that of the rod 1 or the mesh-shaped body 5. According to this method, both net-like bodies 1 and 5 can be firmly connected and integrated by a simple manual operation, so that the embankment body can be effectively reinforced and is an effective method.

When constructing the first-step embankment, the mesh bodies 1 and 5 may or may not be connected. In the case of connection, as an example thereof, there may be mentioned a method in which the reticulate body 5 is first bent into an L-shape and the bottom end portion and the reticulated body 1 end portion are connected on the horizontal ground by the above-described method. . For the uppermost stage of the embankment, a method of horizontally bending the mesh body 5 toward the embankment and fixing it with an anchor pin or the like can be adopted.

[0017]

EXAMPLES The present invention will be described in more detail with reference to an example of a method of constructing an embankment, but the present invention is not limited to the example.

A reticular plastic net body (Tensor SR35 manufactured by Mitsui Chemicals, Inc.), which is stretched in the uniaxial direction shown in FIG. 2, is laid on the entire bottom surface of the construction site, and anchors are provided at the four corners. I struck it in and fixed it. On top of that, embankment material (major classification sandy soil according to the Geotechnical Society standard,
0.2 for small classification fine sand (SF)
It was sprinkled out every 5 m thickness and sufficiently compacted.

Simultaneously with the embankment construction on the lowermost surface, the end of the net-like body laid along the slope was fixed with anchor pins together with the net-like body laid horizontally at the bottom of the slope. The reticulated body for slope formation used here was a plastic reticulated body (Tensor SR35 manufactured by Mitsui Chemicals, Inc.) that was stretched in the same uniaxial direction as that used for horizontal laying.

After embankment material was piled up to a height of 1 m from the lowermost surface and compacted, the slope was adjusted so as to meet the slope slope design value of 1: 1.5, and then a mesh body for slope formation was laid. . On the other hand, a horizontal mesh was laid on the upper surface of the embankment.
The mesh used at this time was the same as that used for the lowermost surface, and one end of the mesh was brought out from the slope to connect to the slope mesh described later.

A vegetation sheet was laid on the front surface of the slope, and a net for forming a slope was covered on the vegetation sheet. At the part where the slope forming net and the end of the horizontal laid net overlap, bend the end of the horizontal net to engage the mesh of the slope forming net between the mesh materials. The rod-shaped body 7 was inserted to connect and fix both mesh bodies. The width of the rod-shaped connector 7 is 4.5c
A polyethylene molded product having a shape of m, a thickness of 0.5 cm, and a length of 1 m, a product name Tensor Joiner manufactured by Mitsui Chemicals, Inc. was used.

[0022] each 2m high embankment member, laid horizontally polypropylene emission fiber <br/>維製nonwoven (Mitsui Chemicals production capital Ltd. Product trade name Tufnell EX80) as planar drainage material. In addition, wire anchors were struck at intervals of 3 m in accordance with the intermediate height of the mesh body laid in the horizontal direction, and the ends of the wire anchors were tied with a wire to prevent the mesh body from rising.

By repeating the same embankment construction method, a small step was provided every 5 m in height of the embankment, and a strong embankment with a height of 20 m could be formed as a whole.

[0024]

In the embankment method according to the present invention, the net body is laid in the horizontal direction, and is attached and fixed along the slope of the slope whose slope is less than 45 °, so that the embankment body is quickly stabilized. Further, it is possible to realize embankment reinforcement on a horizontal surface and reinforcement and protection of a slope in a short period of time and with high strength. Therefore, this method can be used not only as a general embankment method, but also when embankment is performed using soil that easily erodes or collapses due to rainfall, snowfall, freezing, melting, etc. It is suitable as a simple land development method.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view for explaining an example of an embankment method of the present invention.

FIG. 2 is a perspective view of a mesh body that has been stretched in a uniaxial direction.

FIG. 3 is a perspective view showing a method of connecting mesh bodies.

[Explanation of symbols]

1 Reticulated body laid horizontally 2 embankment 3 anchor pins 4 surface drainage material 5 Reticulated body for slope formation 6 vegetation sheet 7 Rod-shaped connector

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 2001-311172 (JP, A) JP 2002-302952 (JP, A) Registered utility model 3007499 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 17/18

Claims (4)

(57) [Claims] 1. A net-like body is laid horizontally on the ground or on the embankment, and an embankment having a slope less than 45 ° is constructed and rolled on it.
To solidify the embankment, and then lay a mesh body horizontally at a certain height of the embankment and repeat the embankment and rolling.On the other hand, according to the slope of the slope to be constructed, another mesh body along the side surface of the embankment. And mesh the mesh members of the slope forming net and the end of the horizontally laid net, and form the mesh there.
Inserting the rod into the space between the mesh materials made
According to the slope reinforcement embankment method , the two are fixed and integrated. 2. The slope-reinforced embankment method according to claim 1, wherein the net-like body is a plastic net-like body that has been stretched in a uniaxial or biaxial direction. 3. The embankment according to claim 1 or 2, wherein a surface drainage material is further laid horizontally on at least one layer between the horizontally laid mesh bodies. Construction method. 4. A slope-reinforcing embankment method, wherein the embankment according to any one of claims 1 to 3 is formed by further covering the embankment side of the slope-forming net with a vegetation sheet.