JPH0786234B2 - How to create an embankment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for forming an embankment on a ground, and more particularly to a method for reinforcing a embankment to form a stable embankment for a long period of time. Is.

[Prior Art] Reference numeral 1 in FIG. 8 shows an embankment formed by a conventional method. That is, in order to create the embankment 1, on the ground L,
After laying the reinforcing material 2 made of polymer grid or geotextile, stacking the sandbags 4 supporting the wall surface 3a of the earth and sand 3 to be laid, laying the earth and sand 3 on the reinforcing material 2 at a predetermined height, Then, the sandbag 4 is attached to the reinforcing material 2
Is covered by winding up the end part of No. 3, and the above-mentioned steps are subsequently repeated to form the compacted soil 3 and the sandbag 4 by superposing them.

[Problems to be Solved by the Present Invention] However, according to the above method, it takes time to create the sandbags 4 used, and also it takes time to stack them, which is inefficient. Further, when the embankment 1 is extremely high or when the wall surface 3a is steeply inclined, the displacement of the wall surface 3a becomes large, but it is not sufficient to suppress this displacement, and the embankment 1
There is a problem that it lacks in stability.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for forming a bank having excellent stability, which can shorten the construction period and is excellent in the height of the bank and the inclination of the wall surface. .

[Means for Solving the Problems] The present invention has been made in order to achieve the above-mentioned object, and a fiber grid is laid on the ground on which the embankment is to be formed, and along the end portion forming the wall surface of the embankment. Next to the initial step of pulling the other end of the fiber grid to the outside of the embankment wall by a predetermined length, one end of the geotextile that is pulled out to the outside of the embankment wall surface by a predetermined length is overlaid on the position where the wall surface is formed, Then, while laying earth and sand constituting the embankment on one end of the fiber grid, laying soil cement on one end of the geotextile in a state of supporting the wall forming side surface of the earth and sand, and further wall surface side of this soil cement Next to the step of laying vegetation soil on, the side wall surface of the vegetation soil is rolled up with the geotextile at the other end pulled out by the predetermined length, and this geotextile Performing an intermediate step consisting of embedding the other end of the winding in the soil cement, after which the intermediate step is repeated a predetermined number of times, and then as the final step, the other end of the fiber grid has a wall surface of vegetation soil. It is characterized in that the embankment layer is formed by wrapping the side portion and embedding the other end portion of the fiber grid in the soil cement.

[Operation] According to the present invention, the wall surface of the earth and sand forming the embankment is composed of soil cement having sufficient strength and a fiber grid excellent in mechanical properties such as strength, tensile rigidity, shear rigidity and creep characteristics. Supported by a composite structure.

The fiber grid contributes to the stability of the whole embankment due to its characteristics, and effectively suppresses the deformation of the embankment because it has an excellent load distribution effect. In addition, soil cement has a large resistance to local collapse of the wall surface of earth and sand and local load action, so that the embankment can be sufficiently stabilized. Then, in addition to the fiber grid having the above characteristics, both ends of the geotextile one end and the other end of the entrainment are embedded in the soil cement by entraining the outermost vegetation soil and soil cement. The cement is firmly integrated, and the effect of structurally stabilizing the wall surface of the embankment is synergistically promoted.

Therefore, even if the embankment is extremely high or the wall surface of the embankment is very steep, the embankment wall surface is strong, so that a stable embankment is created for a long period of time.

In addition, the vegetation soil that is arranged outside the soil cement and constitutes the outer surface of the wall surface makes it possible to provide a good natural environment because the wall surface of the embankment is greened after construction, and it is also good for the landscape and the wall surface. The collapse of is protected.

[Embodiment] An embodiment of the present invention will be described below in accordance with its procedure with reference to FIGS. 1 to 7.

In FIG. 1, L is the ground on which the embankment 10 should be constructed. First, as an initial step, the wall surface of the embankment 10 on the ground L
A fiber grid 11 formed by integrally molding resin-impregnated fibers into a mesh shape is laid across the boundary with 10a so as to be pulled out from the wall surface 10a of the embankment 10 to be formed by a predetermined length.

Then, the geotextile 12 is overlaid on the position forming the wall portion of the outer end of the embankment 10 in the fiber grid 11, and like the fiber grid 11, a predetermined length from the wall surface 10a of the embankment 10 to be formed. Now pull it out. Its withdrawal length shall be shorter than the fiber grid 11. Geotextile products are categorized into about 10 types, of which the four main types are woven fabric, non-woven fabric, resin net, and geogrid. In this embodiment, woven cloth or non-woven cloth is used.

As shown in FIG. 2, vegetation soil 13 and soil cement 14 are laid in contact with the inside of the vegetation soil 13 on the outer side of the wall surface of the geotextile 12 where the wall portion is to be formed, and further inside the gravel. Sediment 16 is piled up to a predetermined height through drainage material 15 such as. That is, the vegetation soil 13 forming the wall surface portion of the embankment 10, the soil cement 14 and the earth and sand 16 on one end of the fiber grid 11 and the geotextile 12 are successively formed from the wall surface side, and these are further arranged. The other ends of the fiber grid 11 and the geotextile 12 are drawn out to the outside of the wall surface 10a of the embankment 10 by a predetermined length. Therefore, the wall surface 16a of the earth and sand 16 is supported by the soil cement 14.

The soil cement 14 is a mixture of cement and sand, gravel, soil, etc. in the soil, and is laid by adding an appropriate hydraulic solidifying material and rolling.

As shown in FIG. 3, the end portion of the geotextile 12 is covered with the vegetation soil 13 and then wound inside to cover the soil cement 14. Then, the soil cement 14 and the soil 16 are compressed.

Next, as shown in FIG. 4, with the vegetation soil 13 and soil cement 14 overlaid on the top surface of the geotextile 12 where the wall portion is to be formed, the wall 10a of the embankment 10 is pulled out to the outside. Another geotextile 12 is overlaid, and then the vegetation soil 13 is applied to the wall 10a side of the embankment 10 on this upper surface.
A soil cement (14) is laid in contact with the inside of the vegetation soil (13), and further, a soil (16) is piled up to a predetermined height through a drainage material (15) inside the soil cement (14). However, in this case, the embankment material embedding procedure is optional.

 The above steps are repeated.

Up to this point, as shown in FIG. 5, soil 16, soil cement 14, and vegetation soil 13 are stacked in three layers. Next, the embankment of the fiber grid 11 laid on the ground L
The other end of the wall surface (10a) of 10 covers the vegetation soil (13), and the other end is wound around the soil cement (14) and is embedded by covering a part of its upper surface. This is the final step, and the bottom embankment layer 20 is formed as described above.

The fiber grid 11 is described above as a resin-impregnated fiber integrally formed in a mesh shape, but in particular,
A material made of glass or aramid fiber is used as a reinforcing material having high rigidity, and a material made of polyester or nylon fiber has flexibility.

Therefore, as shown in FIG. 7, a fiber grid 11a using glass fibers is used in the horizontal portion on the ground L side, from which the vegetation soil 13 and soil cement 14 on the tip side are provided.
It is preferable to connect and use a fiber grid 11b made of polyester or nylon fiber in the bent portion in which the is wound.

Over the vegetation soil 13 from above the end portion of the earth and sand 16, and lay the fiber grid 11 in a state of being drawn to the outside of the wall surface 10a of the embankment 10 of a predetermined length, on the end portion on the outer side thereof. Geotextile 12 wall of embankment 10 of specified length
Stack them with 10a pulled out.

The fiber grids 11 are connected to each other as shown in FIG.
Joint J etc. are connected and integrated.

Perform steps 1 to 16 above to obtain soil, soil cement
After stacking 14 and vegetation soil 13 in three layers, cover the vegetation soil 13 with the fiber grid 11, wrap it inside, bury it over a part of the upper surface of the soil cement 14, and bury it. The embankment layer 21 is formed on the top.

As mentioned above, earth and sand 16, soil cement 14 and vegetation soil
13, fiber grid 11 and geotextile 12
While burying, the three layers are stacked up to a predetermined height. As a result, as shown in FIG. 6, the bottom embankment layer 20
And the embankment 10 composed of a plurality of embankment layers 21 on the ground is formed on the ground L.

In the embankment 10 created by the above method, the embankment 10
Wall surface 16a of the earth and sand 16 constituting the, a wall surface composed of a composite structure consisting of a soil cement 14 having sufficient strength and a fiber grid 11 having excellent mechanical characteristics such as strength, tensile rigidity, shear rigidity and creep characteristics. Supported by the department.

The fiber grid 11 contributes to the stability of the entire embankment 10 due to its characteristics, and since it has an excellent load distribution effect, it effectively suppresses the deformation of the embankment 10. Also, soil cement
14 has a large resistance to the small collapse of the wall surface 16a of the earth and sand 16 and the local load action, and therefore forms a strong wall surface portion, whereby the embankment 10 can be sufficiently stabilized. And in addition to the fiber grid 11 with the above characteristics, geotextile
Since both ends of 12 are embedded and fixed in the soil cement 14 having the above characteristics, the vegetation soil and the soil cement are firmly integrated, and a strong wall surface structure that stabilizes the embankment 10 is obtained, and its action is It acts synergistically to promote stabilization of the embankment. Therefore, if the embankment 10 is significantly higher,
Alternatively, even if the wall surface 10a has a very steep slope, the entire embankment 10 is stable for a long period of time, and thus the site can be effectively used. Further, as compared with the conventional method, since mechanized construction is possible because sandbags and the like are not used, the construction period can be shortened. In addition, the geotextile 12 embedded in the vegetation soil 13 and the isol cement 14 in a state where the outer ends of the soil and the cement are embedded in the vegetation soil 13 and isol cement 14 receives the load of the soil 16 that is subjected to the compaction, and the construction of a stronger soil compaction is performed. Therefore, the rolling condition of the soil 16 is maintained at a high level.

Furthermore, the wall surface 10a of the embankment 10 is greened after being formed by the vegetation soil 13, which is good for the landscape and the roots of the vegetation plants prevent erosion of the wall surface.

The above procedure is one embodiment of the present invention, and any procedure may be used as long as it is based on the present invention.

[Effects of the Invention] As described above, according to the embankment creation method of the present invention, the wall surface of the earth and sand constituting the embankment is soil cement having sufficient strength, strength, tensile rigidity, shear rigidity, and creep characteristics. Supported by a composite structure consisting of a fiber grid with excellent mechanical properties such as, the wall surface of the embankment and the earth and sand part of the embankment are integrated, and in addition to the fiber grid, both ends of the geotextile are wrapped in.
Since the outermost vegetation soil and soil cement are rolled up and embedded in the soil cement, the vegetation soil and soil cement are firmly integrated, and the action of stabilizing the embankment is synergistically promoted. As a result, even if the high embankment or the wall surface of the embankment is steep, it is possible to perform a more powerful compaction of sand and sand, and thus a stable embankment is created over a long period of time. Since the site can be effectively used and sandbags are not used compared to the conventional method, mechanized construction is possible, labor saving is achieved, and the construction period is shortened. In addition, the vegetation soil that is arranged on the outer side of the soil cement and constitutes the outer surface of the wall surface makes the wall surface of the embankment green after construction, providing a natural environment and improving the scenery. Erosion is prevented.

[Brief description of drawings]

1 to 6 are sectional views for explaining the procedure of one embodiment of the present invention, FIG. 7 is a side view showing the structure of a fiber grid, and FIG. 8 is a sectional view for explaining a conventional method. . 10 …… embankment, 10a …… wall surface, 11 …… fiber grid, 12 …… geotextile, 13 …… vegetation soil, 14 …… soil cement, 20 …… bottom embankment layer, 21 …… embankment layer, L…
…ground.

Front page continued (72) Inventor Takuro Odawara, 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. Incorporated (56) References JP 61-207723 (JP, A) JP 63-176524 (JP, A)

Claims (1)

[Claims] 1. An initial step of laying a fiber grid on the ground on which the embankment is to be formed, and drawing the other end of the fiber grid along the edge forming the wall surface of the embankment to the outside of the wall surface of the embankment by a predetermined length. Next, one end of the geotextile drawn out a predetermined length outside the embankment wall is overlapped on the position forming the wall surface, and then the earth and sand constituting the embankment is placed on the one end of the fiber grid and the geotextile is also formed. After laying soil cement in a state of supporting the wall forming side surface of the earth and sand on one end of, and laying vegetation soil on the wall surface side of this soil cement, the wall surface side portion of vegetation soil, An intermediate step consisting of winding the other end of the geotextile drawn out for a length and embedding the other end of the windup of the geotextile in the soil cement. After that, the intermediate step is repeated a predetermined number of times, and then, as the final step, the wall surface side portion of the vegetation soil is wound at the other end portion of the fiber grid and the other end portion of the fiber grid is embedded in the soil cement. A method of forming an embankment, which comprises forming an embankment layer by means of.