JP2015014163A - Greening slope structure and construction method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a greening slope structure that can suppress the length of a reinforcement material and that enables easy execution of slope planting, and a construction method for the same.SOLUTION: A greening slope structure 30 includes: a slope section 31 that is formed by making use of ordinary earth; a fill body 32 that is formed by making use of improved earth; a plurality of slope units (slope anchorage materials) 34 that are arranged in the height direction of the slope section 31; and main and auxiliary reinforcement materials 35a and 35b which are fixed to the slope units 34, respectively, and which are arranged on the rear sides of the slope units 34, respectively.

Description

  The present invention relates to a greening slope structure and a method for constructing a greening slope structure.

  For example, the following techniques are known as conventional techniques for creating embankments on roadsides and greening the slopes of embankments.

  As shown in FIG. 5, the first technique uses a sloped surface unit 12 having a net shape and an L-shaped side surface as a fastening material (wall surface material), and a vegetation sheet 13 on the back side of the sloped unit 12. Is to arrange.

  The second technique is a construction method described in Patent Documents 1 and 2. This construction method is a construction method in which a vegetation base material is sprayed on a slope after the slope has been created.

Japanese Patent No. 3318437 Japanese Patent No. 3466978

  In the first technique, since the reinforcing material 14 extends long behind the slope, a pile, a basement or the like cannot be formed, and land use is restricted. Moreover, when the depth of embankment is small, there exists a possibility that installation of the reinforcing material 14 may become difficult. If the improved soil is a banking material, the extension of the reinforcing material 14 can be shortened. However, when the improved soil is used, there is a problem that greening (vegetation) becomes difficult.

  In the 2nd technique, since it is necessary to spray a vegetation base material after forming a slope, it has to work in a high place.

  From such a point of view, the present invention provides a greening slope structure and a method for constructing a greening slope structure that can suppress the length of the reinforcing material and that can easily perform slope planting. This is the issue.

  The present invention for solving the above problems is a greening slope structure comprising a slope portion formed of ordinary soil and a bank body formed of improved soil behind the slope portion, wherein the slope portion and the fill The main body is stacked in layers.

  According to the present invention, since the slope portion of the normal soil where the plants for slope planting are easy to grow and the embankment body made of the improved soil are created in the same layer at the same time, and this is stacked on top, the planting method The surface structure can be easily created.

  And a plurality of method fastening members arranged in the height direction of the slope portion, and a reinforcing member fixed to each of the method fastening members and disposed on the rear side of the method fastening member, The surface portion is provided between the front surface of the embankment main body and the back surface of the fastening material, and the reinforcing material is fixed to the embankment main body.

  According to the present invention, since the reinforcing material is fixed to the embankment main body made of the improved soil, it is possible to ensure the required shear resistance even when the reinforcing material is shortened. If the reinforcing material can be shortened, the area where land use is restricted is narrowed, so it is possible to construct a structure or the like on the embankment. Moreover, according to this invention, since normal soil is arrange | positioned between the embankment main body and the fastening material, it becomes easy to perform greening compared with the case where vegetation is directly performed with respect to improved soil.

  It is preferable that the slope portion has vegetation means (for example, a vegetation sheet, a vegetation mat, a vegetation sandbag, etc.) covering the normal soil or seeds mixed with the normal soil. If it does in this way, it will become possible to perform greening without waiting for the arrival of seeds.

  The method for constructing a greening slope structure according to the present invention includes a first step of installing a fastening member for holding a slope and connecting a reinforcing member extending behind the fastening member to the fastening member. A second step of embedding the improved soil on the reinforcing material to form an improved soil layer and disposing the ordinary soil between the improved soil layer and the fastening member, and a slope having a predetermined height. In the second step, the normal soil is filled with a vegetation sheet or a vegetation mat arranged along the back surface of the fastening material. It is characterized by that.

  Further, according to another method of constructing a greening slope structure according to the present invention, a fastening member that holds a slope is installed, and a reinforcing material that extends behind the fastening member is connected to the fastening member. A first step and a second step of embedding improved soil on the reinforcing material to form an improved soil layer, and placing ordinary soil between the improved soil layer and the fastening material, have a predetermined height. In the second step, a vegetation sandbag filled with normal soil is set or a normal soil mixed with seeds is used. It is characterized by embankment.

  According to the present invention, since the vegetation work is performed together with the creation of the embankment (slope), the construction period can be shortened compared to the case where the vegetation base material is sprayed after the slope is formed, Work at height can be reduced. That is, according to the present invention, it is possible to shorten the construction period while improving safety.

  According to the present invention, the length of the reinforcing material can be suppressed and the slope can be easily greened.

It is sectional drawing which shows the greening slope structure which concerns on embodiment of this invention. It is a perspective view which shows the structure of the slope unit and reinforcement material of this embodiment. It is a side view which shows the structure of the slope unit and reinforcement material of this embodiment. It is sectional drawing for demonstrating the construction method of a greening slope structure. It is sectional drawing which shows the conventional greening slope structure.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a sectional view showing a greening slope structure according to an embodiment of the present invention. The green slope structure 30 of the present embodiment is formed on the side of the road 21 developed by cutting the ground 20. In addition, in this embodiment, although the case where it applies to a piece embankment is illustrated, you may apply to a both embankment and a belly embankment.

  The greening slope structure 30 includes a slope part 31 formed using ordinary soil, a bank body 32 formed using improved soil, and a plurality of slope units arranged in the height direction of the slope part 31 ( And a main reinforcing member 35a and an auxiliary reinforcing member 35b which are fixed to each of the slope unit 34 and disposed on the rear side of the slope unit 34. Hereinafter, the main reinforcing material 35a and the auxiliary reinforcing material 35b may be simply referred to as reinforcing materials 35a and 35b.

  The slope portion 31 is provided between the front surface of the embankment main body 32 and the back surface of the slope unit 34. The slope portion 31 of the present embodiment includes a surface embankment made of ordinary soil and a vegetation sheet 37. Ordinary soil consists of ground materials suitable for plant growth. Ordinary soil is not mixed with solidifying material such as cement. The vegetation sheet 37 is prepared by adding seeds and fertilizer to a non-woven fabric, cotton, paper, straw, felt or the like having moisture retention.

  In place of the vegetation sheet 37, a vegetation mat may be used, or a vegetation sandbag filled with ordinary soil may be used. Alternatively, the vegetation sheet 37 may be omitted, and ordinary soil (seed mixed soil) in which seeds are mixed may be used.

  The embankment main body 32 is a embankment (so-called improved embankment) using the improved soil as a embankment material, and is formed beside the slope 20 a of the natural ground 20. The improved soil is a material in which a solid material such as cement is mixed with the ground material.

  As shown in FIG. 2, the slope unit 34 is arranged in the height direction and the width direction when viewed from the front. The slope unit 34 has a net shape, and the side surface is L-shaped as shown in FIG. In FIG. 2 and FIG. 3, illustration of embankment material (normal soil, improved soil) is omitted.

  The slope unit 34 of the present embodiment is made of a high-strength, non-corrosive polymer material, a holding portion 34a that holds the slope, a horizontal portion 34b that extends rearward, and a brace that supports the holding portion 34a. And a connecting metal fitting 34c. The holding part 34a is inclined with a slope. The length of the horizontal part 34 b (depth of the slope unit 34) is substantially equal to the width (depth) of the slope part 31. The configuration of the slope unit 34 may be changed as appropriate. Although illustration is omitted, for example, the slope unit 34 may be made of steel, and instead of the net-like slope unit 34, a green concrete block (having a pocket on which a planting can be installed on the front surface) is used. May be.

  The main reinforcing material 35 a and the auxiliary reinforcing material 35 b are both planar geotextiles and are connected to the horizontal portion 34 b of the slope unit 34. As shown in FIG. 2, each of the reinforcing members 35a and 35b has a rectangular net shape having the same width as the slope unit 34, and is arranged in a state extending to the rear side of the slope unit 34 as shown in FIG. It is fixed to the ground (original ground or embankment main body 32) by a U-shaped fixing pin 39. The reinforcing members 35 a and 35 b of the present embodiment are made of the same material as the slope unit 34. The reinforcing members 35a and 35b are finally embedded in the embankment body 32 and fixed to the embankment body 32 by frictional resistance.

  Since the reinforcing members 35a and 35b are fixed to the embankment main body 32 having a large shear resistance, the horizontal length is significantly shorter than the case of fixing to the normal soil. For example, the length L1 of the main reinforcing member 35a is 2 m, and the length L2 of the auxiliary reinforcing member 35b is 1.5 m. Although the length L1 of the main reinforcing material 35a is longer than the length L2 of the auxiliary reinforcing material 35b, the reinforcing materials 35a and 35b may be the same length. Moreover, you may change suitably the structure of the reinforcing materials 35a and 35b. For example, although not shown, a steel strip, a steel bar, or an anchor material may be used as the reinforcing material instead of the planar geotextile.

Next, with reference to FIG. 4, the construction method of the greening slope structure 30 will be described.
The greening slope structure 30 is constructed by dividing into n layers, and the first step and the second step described below are performed in each layer. That is, in order to construct the greening slope structure 30, the first step and the second step may be repeated alternately until a slope having a predetermined height H is created. The height of each layer is substantially the same as the height of the slope unit 34, but may be changed as appropriate.

  The first step is a step of installing the slope unit 34 and connecting the main reinforcing member 35 a or the auxiliary reinforcing member 35 b to the slope unit 34.

  In the second step, the improved soil is embanked on the main reinforcing material 35a or the auxiliary reinforcing material 35b to form an improved soil layer (the embankment main body 32 for one layer), and between the improved soil layer and the slope unit 34. This is the process of placing ordinary soil in

Hereinafter, the construction method of the greening slope structure 30 will be described in more detail.
First, the slope unit 34 is installed on the ground 40 of the prepared ground, and the main reinforcing member 35a is connected to the slope unit 34 (first first step). The main reinforcing member 35 a is laid on the ground 40 and fixed to the ground 40 by driving U-shaped fixing pins 39 into the ground 40. A vegetation sheet 37 is disposed along the back surface of the slope unit 34 (the back surface of the holding portion 34a). The vegetation sheet 37 is disposed so as to cover the back surface of the holding portion 34a, and is fixed to the holding portion 34a using a wire or the like. The vegetation sheet 37 may be attached in advance to the back surface of the holding portion 34a.

Next, the first layer H1 is filled (first second step).
Specifically, on the back side of the holding portion 34a of the slope unit 34, normal soil is filled with a predetermined width to form the slope portion 31 for one layer (the height of the slope unit 34). An improved soil is embanked on the rear side of the surface portion 31 to form an improved soil layer (an embankment main body 32 for one layer). Normal soil and improved soil are compacted by rolling with a vibrating roller. The normal soil is brought into close contact with the vegetation sheet 37. The embankment of the first layer H1 may be performed once (one layer) or divided into a plurality of layers. Further, after forming the improved soil layer, normal soil may be filled between the slope unit 34 and the improved soil layer.

  In addition, when using a vegetation sandbag instead of the vegetation sheet 37, a vegetation sandbag filled with normal soil may be stacked between the slope portion 31 and the improved soil layer (filling body 32).

  When the first layer H1 is constructed, the slope unit 34 of the second layer H2 is installed on the slope part 31 of the first layer H1, and the auxiliary reinforcing member 35b is connected to the slope unit 34 (second time). First step). The slope unit 34 of the second layer H2 is arranged so that its holding part 34a is substantially flush with the holding part 34a of the slope unit 34 of the first layer H1. The auxiliary reinforcing material 35b is laid on the upper surface of the improved soil layer of the first layer H1, and fixed to the improved soil layer by driving a fixing pin 39 into the improved soil layer. A vegetation sheet 37 is disposed along the back surface of the slope unit 34 (the back surface of the holding portion 34a).

Next, the second layer H2 is filled (second second step).
Specifically, on the back side of the holding portion 34a of the slope unit 34 of the second layer H2, normal soil is filled with a predetermined width, and the slope portion 31 is one layer (the height of the slope unit 34). At the same time, the improved soil is filled on the rear side of the slope portion 31 to form a second improved soil layer.

The construction method from the third layer H3 to the nth layer Hn is performed in the same manner as the second layer H2.
Thereafter, after a predetermined period, the improved soil is solidified to increase the shear resistance (pullout strength) of the embankment main body 32, and the reinforcing members 35a and 35b of the layers H1 to Hn are held in the solidified improved soil. Moreover, when the plants sprouted from the vegetation sheet 37 are settled on ordinary soil, the slope of the greening slope structure 30 is greened.

  According to the greening slope structure 30 of the present embodiment, since the reinforcing members 35a and 35b are fixed to the embankment main body 32 made of improved soil, even if the reinforcing members 35a and 35b are shortened, the required shearing is performed. Resistance can be secured. In particular, since the reinforcing members 35a and 35b of the present embodiment are net-like, they are held even by strong frictional resistance. If the reinforcing members 35a and 35b can be shortened, the range in which land use is restricted is narrowed, so that it is possible to construct a structure or the like on the embankment. Moreover, since normal soil is arrange | positioned between the embankment main body 32 and the slope unit 34, it becomes easy to perform greening compared with the case where vegetation is directly performed with respect to improved soil.

  Moreover, according to the construction method of the greening slope structure of this embodiment, because vegetation is performed together with the creation of the embankment (slope), compared to the case of spraying the vegetation substrate after forming the slope, Work in high places can be reduced and the construction period can be shortened.

  In addition, although the construction method of the greening slope structure and the greening slope structure of the above embodiment was applied to a road slope, in addition to this, a dike, a dam-related slope, a residential land / factory development site, a park / It can be applied to slopes of golf courses and railways.

30 Greening Slope Structure 31 Slope Part 32 Embankment Body 34 Slope Unit (Screw Material)
35a Main reinforcing material (reinforcing material)
35b Auxiliary reinforcement (reinforcing material)
37 Vegetation sheet

Claims (5)

It is a greening slope structure composed of a slope part formed with ordinary soil and a bank body formed with improved soil behind this slope part,
The said slope part and the said embankment main body are piled up in layers, The greening slope structure characterized by the above-mentioned. A plurality of method fastening materials disposed in the height direction of the slope portion,
A fixing member fixed to each of the fastening members and disposed on the rear side of the fastening member,
The slope portion is provided between the front surface of the embankment main body and the back surface of the retaining material,
The greening slope structure according to claim 1, wherein the reinforcing material is fixed to the embankment main body.   The green slope structure according to claim 1 or 2, wherein the slope part has vegetation means for covering the plain soil or seed mixed with the plain soil. A first step of installing a fastening member for retaining the slope and connecting a reinforcing member extending rearward of the fastening member to the fastening member;
A second step of embedding improved soil on the reinforcing material to form an improved soil layer, and placing ordinary soil between the improved soil layer and the fastening material;
A method of constructing a greening slope structure that repeats alternately until a slope with a predetermined height is created,
In the second step, normal soil is embanked with a vegetation sheet or a vegetation mat disposed along the back surface of the fastening material. A first step of installing a fastening member for retaining the slope and connecting a reinforcing member extending rearward of the fastening member to the fastening member;
A second step of embedding improved soil on the reinforcing material to form an improved soil layer, and placing ordinary soil between the improved soil layer and the fastening material;
A method of constructing a greening slope structure that repeats alternately until a slope with a predetermined height is created,
In the second step, a vegetation sandbag filled with ordinary soil is installed, or ordinary soil mixed with seeds is embanked.

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