JPS62185911A - Fill-dam using geotextile - Google Patents

Abstract

PURPOSE:To shorten the period of construction work by a method in which a geotextile filter is set along the inner surface of a cylindrical shell formed of a high-strength latticed geotextile net, and soil is packed into the shell. CONSTITUTION:A cylindrical shell 10 is formed of a high-strength latticed geotextile net, and a filter 11 of geogrid is provided along the inner surface of the shell 10 to make up a shell body A. The shell body A is set on the partly cut upside of an existing fill-dam 3 and connected through an arc part B formed in the same way as in the shell body A. Soil 12 is then packed into the shell body A and the arc part B to obtain a filling of a given strength.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a fill dam using geotextile, in which cylindrical cells formed using geotextile are used as f11 in the raised portion of the fill dam.

"Conventional technology" As is well known, when building a dam on a river, fill dams
It is generally used to temporarily close waterways.

Conventionally, as this type of fill dam, one shown in FIG. 3 is known. In the figure, numeral 1 is the riverbed, 2
is the water surface. An existing fill dam (portion indicated by a two-dot chain line) 3 has been constructed above the riverbed 1, and the height of the dam body corresponds to the water level 2. Above it, a fill dam 3 has been constructed that corresponds to the water level 4, where the water type of the river has increased. A raised fill dam 5 is constructed for this purpose.

An impermeable core 6 is provided inside the fill dam 3.5, and on both sides of the impermeable core 6, a permeable fill 7.7 made of high-quality earth and sand is formed with a predetermined legal slope. In order to prevent the structure from collapsing, the structure is covered with a cage, paved with concrete or asphalt, or covered with wire mesh, etc.

``Problems to be Solved by the Invention'' However, in the conventional fill dams, the higher the height of the levee body, the gentler the legal slope of the levee body, and the need for high-quality earth and sand, which is the material for the levee body. , construction requires a large number of large construction equipment, and the construction cost of raising the height is particularly high compared to the cost of new construction.
There were problems such as poor workability, long construction period, and economic difficulties.

The present invention has been made in view of the above problems, and eliminates the need for a large number of large construction machine acupuncture needles, and uses locally produced materials to improve workability and shorten the construction period. The purpose of this project is to provide a fill dam using geotextile that can significantly reduce construction costs.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a cylindrical cell formed using a geotextile made of a high-strength lattice net, and a method provided along the inner peripheral surface of the cylindrical cell. It is characterized by comprising a filter made of geotextile and earth and sand filled inside the filter.

In this case, it is desirable to provide at least one reinforcing material made of a planar lattice-shaped geotextile inside the cylindrical cell on a plane perpendicular to the axis of the cylindrical cell.

"Function" In the fill dam using the geotextile of the present invention, the high-strength lattice-like cylindrical cells give the filling soil a confining effect, and the filling soil receives a large shearing effect due to the interlocking effect of the reinforcing material. It is strong and highly stable, and does not require a large legal gradient like conventional fill dams. In addition, geotextile is lightweight, making it easy to transport and handle. Since a filter is provided inside the cylindrical cell,
Filled earth and sand will not be washed out by running water.

"Example" Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 and FIG. 2 show an embodiment of the present invention,
Using geotextile. FIG. 2 is a cross-sectional view and a perspective view of a fill dam. In these figures, the same elements as those in the conventional technique shown in FIG. 3 are given the same reference numerals, and their explanations will be omitted.

In FIG. 1, reference numeral A is a cell body constituting a fill dam using geotextile, and as a fill dam with a raised part provided to correspond to the water surface 4, it is attached to the upper surface of an existing fill dam 3 by cutting a part of the upper part. is set up. The outer peripheral portion of the cell body A is a cylindrical cell IO made of geotextile, and in this example, a lattice net made of high-strength fibers, that is, a lattice net made of aramid fibers with a diameter of about 8 mm at predetermined intervals. It is made of geotextile formed into a cylindrical shape. Inside the cylindrical cell IO, a thick sheet of polypropylene or high-density polyethylene with holes drilled along its inner circumferential surface was stretched in the -axis or biaxial direction to orient the polymer. Filter 1 consisting of stretched plastic net, i.e. geogrid
1 is provided, and the inside thereof is filled with earth and sand 12 generated at the site at a predetermined density.

The filter If has a lattice mesh that prevents the packed soil 12 from flowing out by running water, and if the locally generated soil 12 is poor soil with low shear strength,
Inside the cylindrical cell 10, a reinforcing material 13 made of a planar lattice-shaped geotextile made of aramid fibers is disposed on a plane perpendicular to the axis thereof. This reinforcing material 11 is formed into a circular shape having a diameter that is approximately the same as the inner diameter of the cylindrical cell lO, and is buried in layers between the earth and sand 12 at a predetermined interval, thereby creating an interlock effect (earth and sand I2 The reinforcing material 13 attempts to move integrally with the reinforcing material 13, thereby exhibiting an effect of increasing shear strength.

Note that the reinforcing material 13 may have its outer peripheral portion connected to the cylindrical cell IO, and is not necessary when the locally generated earth and sand 12 is good quality earth and sand with high shear strength.

In addition, the upper part of the cylindrical cell IO is covered with a geomembrane I4 for fading (lid) made of geotextile, and the lower part of the cell body A is covered with tension as shown in Fig. 2 to increase stability. It is constructed by being buried with 15 stones.

Furthermore, the fill dam of this embodiment is the cell body A described above.

A plurality of cells A, . Arc parts B and B constructed by

The walls are constructed by being connected by...

Therefore, in the fill dam using geotextile of this example, the wall body is constructed by connecting the cell body A and the arc part B to the raised part of the existing fill dam, and the cell body A is made of high-strength fiber. Since the formed cylindrical cell 10 is filled with earth and sand 12 with high or increased shear strength, it has sufficient strength and stability as a wall body. Unlike conventional fill dams, it does not require a gentle slope, so it is sufficient to use locally generated earth and sand. Filter It, hli reinforcement13. Since lightweight and inexpensive geotextile is used for the geomembrane 14, it is easy to transport and handle, eliminating the need for large construction machines that are often used, and improving workability. As a result, it is possible to shorten the construction period and achieve a significant reduction in construction costs.

Therefore, fill dams using the geotextile of the present invention can be used for raising fill dams in mountainous remote areas with severe site conditions, for construction on remote islands where it is difficult to supply materials such as large-scale construction machinery, and for temporary disaster prevention dams for large-scale civil engineering works. It can be used for construction work, adjustment ground dam work, etc. for construction work where it is difficult to secure land.

"Effects of the Invention" As explained above, the present invention includes a cylindrical cell formed using geotextile, a filter provided along the inner peripheral surface of the cell, and earth and sand filled inside the cell. This eliminates the need for a large number of large construction machines, and
It becomes possible to use locally generated earth and sand, resulting in excellent workability, shortening the construction period and significantly reducing construction costs.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, in which a sectional view of a fill dam using geotextile is shown, FIG. 2 is a perspective view thereof, and FIG. 3 is a sectional view of a conventional fill dam. A... Cell body, B... Arc part, IO
......Typical cell, II...Filter, 1
2...Earth and sand, 13...Reinforcement material

Claims (2)

[Claims] (1) Comprising a cylindrical cell formed using geotextile made of a high-strength lattice net, a filter made of geotextile installed along the inner circumferential surface of the cell, and earth and sand filled inside the cell. A fill dam using geotextile characterized by: (2) At least one reinforcing material made of a planar grid-like geotextile is provided inside the cylindrical cell on a plane perpendicular to the axis of the cylindrical cell. Fill dam using the described geotextile.