JPH03208915A - reinforced embankment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to reinforced embankments constructed for roads, airports, residential development, etc.

[Problems to be Solved by the Invention] Conventionally, concrete retaining walls have been mainly used when constructing steep slope embankments for the purpose of effective use of land, but there have been problems in terms of economy and ease of construction. In recent years, reinforced embankment construction methods using nonwoven fabrics have been proposed to improve economy and workability. For example, there is an embankment reinforcement method in which a nonwoven fabric with good water permeability is laid horizontally in multiple layers inside the embankment as a drainage material and a tensile reinforcing material, and the nonwoven fabric is rolled up in the slope area to improve the stability of the embankment body and the slope area.

In such an embankment reinforcement method using nonwoven fabric, in order for the nonwoven fabric to function as a tensile reinforcing material, it is necessary to securely fix the nonwoven fabric laid in the soil so that it will not be pulled out. Normally, the nonwoven fabric is fixed using a bottle made of reinforcing steel or the like, but by making holes in the nonwoven fabric, the tensile strength of the nonwoven fabric itself is reduced. Furthermore, if the embankment material is a soft material such as clayey soil, the fixing method using pins cannot be said to be reliable, and the tensile reinforcing effect of the nonwoven fabric cannot necessarily be expected.

This invention has been made in view of the above-mentioned problems. The purpose is to propose a reinforced embankment that can securely fix reinforcing materials such as non-woven fabrics in the embankment, has a high drainage function, and has excellent stability.

[Means for solving problems]

This reinforced embankment is made by laying multiple layers of permeable sheets at predetermined intervals in the vertical direction within the embankment, and making the side edges of the sheets wrap around the embankment slope surface layer and extend to the upper sheet layer. In the embankment, permeable sheets laid in each layer are characterized by having perforated pipes fixed to their surfaces.

[Function] In this reinforced embankment, the perforated pipes are fixed to the surface of the permeable sheet, so the perforated pipes act as anchors in the soil, ensuring that the tensile reinforcing effect of the permeable sheet is exerted. can. Furthermore, since perforated pipes can quickly collect and drain pore water in the soil, these two functions work together to provide excellent stability to the embankment.

The water-permeable sheet in the present invention is a nonwoven fabric made of polyethylene, polypropylene, polyester, or polyamide, a net-like molded product, or a woven fabric of these fibers. A perforated tube is a hollow tube that has many through holes on its surface.

(Example〕 The present invention will be explained below with reference to illustrated embodiments.

In FIG. 1, a water-permeable sheet made of a nonwoven fabric 1 is laid on the base of an embankment, and a plurality of perforated pipes 2 are arranged on the upper surface of the nonwoven fabric 1 substantially parallel to a surface that is to be a slope. The perforated pipe 2 is the second.
As shown in Figure 3, a nonwoven fabric 3 is wrapped around the surface of the nonwoven fabric 3 to prevent clogging of the through holes on the surface, and then a joint 4 is attached to the laid nonwoven fabric 1.
Join and fix at. In order to fix the perforated pipe 2 to the nonwoven fabric 1, it is preferable to join the perforated pipe 2 through the nonwoven fabric 3.

For example, if Toughnel (Civil Pine) U-type manufactured by Mitsui Petrochemicals Co., Ltd. is used as the nonwoven fabric, thermal welding can be performed by heating with a torch lamp or the like, making it easy to join on site.

Subsequently, in FIG. 4, embankment material 5 is leveled on the nonwoven fabric 1,
After compaction, the side edges of the nonwoven fabric 1 are laid around the slope surface layer of the embankment material 5, extending over the upper surface of the embankment material 5.

On this embankment material 5, as shown in Fig. 5, a second layer of nonwoven fabric 1-
2 is laid down and joined to the edge of the upper layer nonwoven fabric 1 extending on the lower surface thereof at a joint 4. Subsequently, the perforated tube 2 is wrapped with the nonwoven fabric 3 in the same manner as described above, and is bonded and fixed to the nonwoven fabric 1-2. As shown in FIG. 6, the nonwoven fabric 1-2 to which the perforated pipe 2 is fixed is tied to the perforated pipe 2 with a wire 6, pulled with a heavy machine such as a backhoe, and temporarily fixed with a wooden stake or the like to remove loosening. At this time, if the rigidity of the perforated pipe 2 is small, a steel pipe or the like is passed through the perforated pipe,
A wire is attached to it and a series of tension operations are performed.

By repeating the above steps, the non-woven fabric 1 is laid in multiple layers, and the embankment material 5 is
The soil is leveled and compacted to form a reinforced embankment. In addition, the perforated pipe 2 is made continuous in the transverse direction using a joint etc.
The ends should be brought out of the embankment body to allow drainage of pore water in the soil.

〔Effect of the invention〕

This invention is as described above. This reinforced embankment reliably performs the tensile reinforcement function of the permeable sheet and the drainage function of the perforated pipe, and has excellent stability.

[Brief explanation of drawings]

The drawings are longitudinal cross-sectional views showing construction examples in the order of steps, and Figure 1 shows the state in which the nonwoven fabric is laid on the embankment foundation, Figures 2.3 and 3. .5
．． Figure 6 shows the state where the first layer of embankment material is leveled and the second layer.
FIG. 7 shows an embankment formed by laying multiple layers of nonwoven fabric and a state in which tension is applied to the nonwoven fabric. 1... Nonwoven fabric, 2... Perforated pipe, 3... Nonwoven fabric, 4
・・・Connection part, 5... Embankment material, 6... Wire diagram diagram diagram diagram diagram diagram diagram diagram diagram diagram diagram

Claims (1)

[Claims] (1) In a reinforced embankment where multiple layers of water-permeable sheets are laid at predetermined intervals in the vertical direction within the embankment, and the side edges of the sheets are wrapped around the embankment slope surface layer and extended to the upper sheet layer. , a reinforced embankment characterized by a permeable sheet laid on each layer with perforated pipes fixed to its surface.