JPH0765316B2 - Steep embankment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a steep slope embankment in which a steep wall portion is formed by stacking a plurality of sandbags in layers.

“Prior Art” M in FIG. 7 indicates an embankment constructed by a conventional method.

That is, in order to create the embankment M, the geotextile 2 is laid on the ground G, the sandbags 20 forming the wall surface 3a of the embankment M are stacked, for example, three layers at a time, and then the embankment material 3 is placed on the geotextile 2. To a predetermined height and then
The sandbag 20 is covered by rolling up the end portion of the geotextile 2, and the above steps are continuously repeated to form the wall portion H by the sandbag 20 by overlapping the sandbag 20 and the embankment material 3 behind the sandbag 20. The embankment M behind is being created.

[Problems to be Solved by the Invention] By the way, in the embankment M in which the wall portion is formed by using the sandbag 20 as described above, when the height is remarkably increased or the wall surface 3a is steeply inclined, the geotextile is In addition to the slippery contact surfaces of the sandbags 2 and the sandbag 20 not being firmly fixed to the geotextile 2, the displacement of the wall surface 3a due to the deformation and movement of the sandbag 20 itself becomes large. In the conventional embankment structure, the displacement over time of the wall surface 3a cannot be sufficiently suppressed, so that in order to prevent a defect such as lack of stability of the embankment M itself, in the current steep embankment, the end portion of the geotextile 2 is It is designed to be stable by being rolled up in the embankment M.

The present invention has been made in view of the above circumstances, and has a steep wall portion that does not occupy a lot of land while shortening the winding length of the geotextile 2 and, for a long period of time, regardless of its height. Excellent stability is ensured, steep slope of 3 min or more (paste) or high embankment of conventional method can be realized, and steep slope that is easy to implement and can shorten the construction period. The purpose is to provide embankment.

"Means for Solving the Problem" In the steep slope embankment of the present invention, an embankment material is laid on the ground, and a plurality of sandbags are piled up in layers at its end to form a wall portion, and A plurality of geotextiles are laid vertically at intervals in the embankment material, and each of these geotextiles covers the sandbag in a state in which it is wound up from the outer surface side of the wall portion, and one end of the geotextile and its end. With the geotextile laid above or below, sandwiched between the upper and lower sandbags,
It is fixed by a self-hardening fixing material sandwiched between the sandbags.

[Operation] In the steep slope embankment of the present invention, each geotextile laid at an interval vertically in the embankment material covers several sandbags of the wall portion by winding it from the outer surface side of the wall portion, In addition, one end of the geotextile and the geotextile laid above or below the geotextile are sandwiched between the upper and lower sandbags, and fixed by the self-hardening fixing material sandwiched between the sandbags. By doing so, the geotextile on the outer surface side of the wall part is attracted to the outer wall surface and the slack is adjusted so that the geotextile is adhered to the outer wall surface. The displacement of the sandbags is completely prevented, and the time-dependent displacement of the outer wall due to the deformation and movement of the sandbags becomes extremely small. Therefore, the stability of the wall is very high. ing.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

FIG. 1 is a diagram showing an embodiment of a steep slope embankment of the present invention. In this figure, a symbol M is an embankment formed on an existing ground G.

As shown in FIG. 1, this steep slope embankment is embanked in a state in which an embankment material 3 such as earth and sand is rolled on the ground G, and a plurality of geotextiles 2 are vertically arranged in the embankment material 3. The sandbags are laid apart and at the end of the sandbags 20
Are piled up in layers, and the sandbags 20 are substantially inclined inward toward the inside of the embankment and are almost vertically overlapped with each other to form a steep wall portion H.

Each of the geotextiles 2 extends substantially horizontally to the rear of the embankment M along the upper part of the ground bag G and each of the sandbags 20 stacked on the ground G in layers from the bottom, and on top of that. It is sandwiched between the sandbags 20 that are located, bends upward at the lower ends of the outer wall surfaces of each sandbag 20, and the four layers of sandbags 20 above the sandbags 20 are wrapped together as a group, and the four layers of sandbags are grouped together. At the upper end of the uppermost sandbag 20 out of 20, the sandbag 20 and the sandbag on it are bent toward the inside of the embankment M.
It is sandwiched between 20 and the end part, which is overlapped with the upper geotextile 2. Each of the geotextiles 2 and 2 is fixed to the lower sandbag 20 by the U-shaped pin 4 and fixed by the self-hardening fixing material 13 that is sandwiched between the upper and lower sandbags 20 and 20.

An anchor 5 is attached between the sandbag 20 of the second layer and the sandbag 20 of the third layer of each of the four-layer sandbags 20. This anchor 5 is made of steel, for example, the second
As shown in the figure, a rod-shaped base portion 5a and a hooking portion 5b welded to the central portion of the base portion 5a are substantially J-shaped, and the upper and lower ends of the base portion 5a are the second layer. Sandbags
It is attached in a state of being inserted into the upper part of 20 and the lower part of the sandbag 20 of the third layer, and the hooking portion 5b is attached to the sandbag 20, 20.
The geotextile 2 which projects from the space to the wall surface and covers the outer surface of the wall portion is held in a pulled state.
The anchor 5 described above may be the one shown in FIG. 3 in addition to the one shown in FIG. Similar to the anchor 5 shown in FIG. 2, this anchor 5 has a base portion 5a and a hooking portion 5b. In this anchor 5, one steel rod is bent and hooked with the base portion 5a. It has a structure in which the stopper 5b is formed.

The self-hardening fixing material 13 is filled between the second-layer sandbag 20 and the third-layer sandbag 20, and the self-hardening fixing material 13 and the base 5a of the anchor 5 prevent The sandbags 5 and 5 of the second and third layers, the anchors 5 and 5, and the sandbags 20 and 20 are fixed and fixed.

As the self-hardening fixing material 13, in addition to soil mortar or soil cement etc. of hard kneading obtained by mixing cement-based solidifying material etc. with earth and sand obtained near the site, hard concrete such as RCD concrete, lime is used. Mixed treatment reinforced soil or the like may be used, or ordinary cement, mortar, cement paste or other cement-based solidifying material, or early-strength mortar or other early-strength cement-based solidifying material may be used.

Further, as the geotextile 2, a woven fabric, a non-woven fabric or the like may be used as a geofabric or a geonet, but a geogrid such as a so-called polymer grid or fiber grid formed by polymerizing a polymer material in a lattice shape is preferable. It is better to use, and it is particularly preferable to use the fiber grid among the geogrids.

Specifically, this fiber grid has a structure in which fiber bundles composed of a plurality of aligned continuous fibers intersect with each other to form a lattice, and each fiber of the fiber bundles is bound by a resin material. In addition, it is a lattice-like reinforcing material having excellent mechanical properties such as strength, tensile rigidity, shearing rigidity, and creep characteristics.

Next, a method of forming such a steep slope embankment will be described.

First, as shown in FIG. 5, the geotextile 2 is laid on the existing ground G on which the embankment M is to be constructed, and one end of the geotextile 2 is positioned more than the position where the wall H is to be constructed. It is extended to the outside by a predetermined length, and then the embankment material 3 is successively laid on the geotextile 2 from the rear to the front, and a first layer is formed at a position where the wall portion H on the geotextile 2 should be constructed. By arranging a plurality of sandbags 20 side by side and stacking the sandbags 20 of the second layer on the sandbags 20 in a zigzag manner as shown in FIG.
The formation of the wall portion H by the sandbag 20 up to the second layer and the filling of the embankment material 3 on the ground G behind the sandbag 20 are performed in parallel, whereby the first embankment layer, which will be described later, is advanced up to half its height. After being formed, the upper portion of the filled embankment material 3 is compacted.

After doing so, the upper center of the sandbag 20 of the second layer is recessed along the extending direction of the wall H to form a recess, and the recess is formed in the sandbag 20, for example, as shown in FIG. In a state in which the base portion 5a of the anchor 5 is inserted and the lower end portion thereof is attached, and the hook portion 5b of the anchor 5 is projected from the upper end of the sandbag 20 of the second layer to the wall surface, the sandbag layer 20 of the first layer described above. The geotextile 2 extending from the bottom to the outer surface of the wall portion H is lifted and bent upward from the lower end of the sandbag 20 in the first layer, so that the sandbag 20 is brought into close contact with the sandbag 20 along the wall surface of the wall portion H. The anchor 5 is started up in a state of being adhered and retained, and the anchor 5 is engaged with the engaging portion 5b. Then, the self-hardening fixing material 13 is further filled in the concave portion of the sandbag 20 of the second layer, and the sandbag 20 of the third layer is inserted into the upper end portion of the base portion 5a of the anchor 5 on the sandbag 20. The sandbag 20 of the third layer is stacked on the sandbag 20 of the second layer such that the center of the lower surface of the sandbag 20 of the layer is recessed in a groove shape and the inside of the recess is filled with the self-hardening fixing material 13 described above. Thus, the respective sandbags 20, 20 are fixed and fixed by the base portion 5a of the anchor 5 and the self-hardening fixing material 13.

After doing so, as shown in Fig. 6, while further embedding the embankment material 3 from the rear to the front on the embankment material 3 filled up to half the height of the embankment layer of the first layer,
By stacking the fourth-layer sandbags 20 on the third-layer sandbag 20 in a zigzag manner as shown in FIG. Ground G
The filling of the embankment material 3 on the upper side is performed in parallel, whereby a first-layer embankment layer to be described later is formed, and the upper part of the first-layer embankment layer is compacted.

After forming the first embankment layer in this way, the end of the geotextile 2 hooked by the above-mentioned anchor 5 is lifted and raised along the wall surface of the wall portion H consisting of the sandbags 20 up to the fourth layer. By bending the inside of the embankment M along the upper end surface of the fourth-layer sandbag 20, the end portion of the geotextile 2 is covered with the upper surface of the fourth-layer sandbag 20, and the first-layer embankment is formed. It is extended to the upper surface of the wall portion H of the layer and temporarily fixed by the U-shaped pin 4.

After doing this, the upper center of the fourth-layer sandbag 20 is recessed to form a recess, and a geotextile 2 different from the above-mentioned geotextile 2 which is covered on the sandbag 20 at the end is described above. Is laid on the first embankment layer, and the geotextile 2 is partially overlapped with the geotextile 2 on the fourth-layer sandbag 20, and one end of the geotextile 2 is attached to the fourth layer. It is made to extend outside the sandbag 20 for a predetermined length. Then, after doing this, the two geotextiles 2, 2 stacked on the fourth-layer sandbag 20 are fixed by replacing the U-pin that temporarily fixes the first-layer geotextile 2 on the upper portion of the sandbag 20. While forming a recess in the upper center of the sandbag 20 and filling the recess with the self-hardening fixing material 13 to the extent that the upper surface of the geotextile 2 is covered, the sandbag 20 of the fifth layer is stacked on the sandbag 20. The self-hardening fixing material 13 to the upper and lower sandbags 20,
It will be installed between 20.

Then, after doing this, by repeating the same steps as the steps described above, the second layer, the third layer of the embankment layer and the embankment layer of the upper layer on the first layer of the embankment layer. By sequentially stacking four layers of sandbags 20 in parallel at the end of each mound layer while forming sequentially,
The embankment M as shown in the figure is formed in parallel with the wall portion H thereof.

According to the steep slope embankment of this embodiment, the geotextile 2 is laid in the embankment material 3, and the sandbags 20 stacked in layers at the ends thereof are grouped into four layers by the geotextile 2. Is wound from the wall surface side, and the end portion of the geotextile 2 is sandwiched between the upper and lower sandbags 20, 20 and fixed to the sandbag 20 with a U-shaped pin 4, and the upper and lower sandbags 20, 20 and the upper and lower geotextiles 2 are fixed and fixed by the self-hardening fixing material 13, and the sandbags 20 and 20 of the middle two layers of the sandbags 20 of the above four layers are the anchor 5 and the self-hardening fixing material 13. And the geotextile 2 on the wall surface of the wall portion H is attracted to the wall portion H and properly adjusted so that there is no slack, so that the upper and lower sandbags 20 can be displaced or deformed. Stability of the wall portion H temporal displacement is prevented becomes extremely high.

[Advantages of the Invention] According to the steep slope embankment of the present invention, the embankment material is laid on the ground, and a plurality of sandbags are piled up in layers at its end to form a wall portion, and the above-mentioned embankment material is also formed. A plurality of geotextiles are laid inside at an interval vertically, and each of these geotextiles is wrapped around the outer side of the wall in a state where several layers of the sandbags are gathered together, and one end of the geotextile and above or above it. The geotextile laid below is sandwiched between the upper and lower sandbags, and is fixed by the self-hardening fixing material that is sandwiched between the sandbags. The geotextile on the wall of the wall is attracted to the wall and is adjusted so that there is no slack, and the above-mentioned self-hardening fixing material further The stability of the wall is higher than before by preventing the time-dependent displacement such as displacement and deformation movement between the lower sandbags and the upper and lower geotextiles. For this reason, even though the amount of geotextile used is minimized, with this steep slope embankment, the wall portion is inclined at a steep slope of 3 min method (glue) or more, which was not possible with conventional embankments. Or even if the embankment is higher than the conventional one, sufficient stability will be secured.

Also, with this steep slope embankment, the rigidity of the entire embankment is increased due to the higher stability of the wall, even if it is a steep slope high embankment, which reduces the settlement amount of the embankment and increases the uneven settlement. Deformation of the ground surface due to the soil is effectively reduced, which contributes to the improvement of the embankment construction quality, and the embankment, the geotextile, and the wall part can act integrally, resulting in an embankment structure with an excellent load distribution effect. From this aspect as well, the deformation of the embankment is effectively suppressed to prevent the embankment from collapsing, which contributes to safety and construction reliability.

Therefore, when such a steep slope embankment is created, it is possible to efficiently utilize the limited site and effectively utilize the embankment site, and in addition to the simple construction, It has a great contribution to the construction industry because it can ensure excellent construction quality, stability, and construction reliability over a long period regardless of the height of the embankment.

[Brief description of drawings]

1 to 6 are views showing an embodiment of the present invention. FIG. 1 is a side sectional view of an end portion of a steep slope embankment, and FIG. 2 is an example of an anchor used in the steep slope embankment. Fig. 3 is a perspective view showing another example of anchors, Fig. 4 is a vertical cross-sectional view of the wall, and Fig. 5 is up to half the height of the first embankment layer in the process of creating steep slope embankment. FIG. 6 is a side sectional view showing a stage where the embankment layer is formed, and FIG. 6 is a side sectional view showing a stage where the first embankment layer has been formed in the process of forming the steep slope embankment. 7th
The figure is a side sectional view of an end portion of a conventional embankment. 3 ... Embankment material, 4 ... U-shaped pin, 5 ... Anchor, 13 ... Self-hardening anchoring material, 15 ... Pin, 16 ... Geotextile, 20 ... Sandbag, 21 ... Base, G ... Ground , M …… embankment, H …… wall.

Claims (1)

[Claims] 1. An embankment material is laid on the ground, and a plurality of sandbags are piled up in layers at its ends to form a wall portion, and a plurality of geotextiles are vertically arranged in the embankment material. The geotextiles are laid apart from each other, and the above-mentioned sandbags are wrapped in several layers so as to cover the sandbags from the outer surface side, and one end of the geotextile and the geotextiles laid above or below the geotextile are A steep sloped embankment characterized in that it is sandwiched between the sandbags and is fixed by a self-hardening fixing material sandwiched between the sandbags.