JPH08302693A - Reinforcing earthwork method - Google Patents

Abstract

PURPOSE: To improve the durability, allow pursuit after deformation of a banking, construct light in the weight, and enhance the transporting performance and workability. CONSTITUTION: A wall surface material 10 of concrete is coupled with an anchor 20 made of concrete or FRP through connecting rods buried therein respectively using a belt shape tensioning material 30 prepared by covering high strength fibers with a synthetic resin. Thus a reinforced earth forming structure A is provided. In the condition that the belt shape tensioning material 30 is laid on the earth surface, the wall surface material 10 is arranged on the slope face of the earth surface, and the anchor 20 is installed inside the wall surface material 10. Inside the wall surface material 10, earth and sand are put in from above the belt shape tensioning material 30 and the anchor 20. This working cycle is repeated while the structure A is shifted inward bit by bit along the slope face, and thus a banking is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has an improved durability.
The present invention relates to a reinforced soil construction method capable of following deformation of an embankment, reducing weight, and improving transportability and workability.

[0002]

2. Description of the Related Art As one of the conventional reinforced soil construction methods for forming embankment on a soil surface, a concrete wall panel is placed on the slope side of the soil at the construction site, and then the wall panel and The anchor plate made of iron plate on the soil surface away from the wall is connected by the reinforcing material of the reinforcing bar, and then the earth and sand are put inside the wall material from above the anchor panel and the reinforcing material, and then the wall panel is attached. In the state that they are stacked upwards,
By repeating these steps, a vertical embankment is formed.

[0003]

However, in the above-mentioned reinforced earth work method, since the tension member connecting the wall panel and the anchor panel is made of a reinforcing bar which is an iron bar, it is buried in the soil for a long time. Therefore, there is a problem that it easily rusts. In addition, since the wall panels are stacked vertically to form the embankment, if the embankment sinks, the wall panels stacked due to the deformation cannot follow and there is a risk of stress concentration and collapse of the wall panels. There is a problem. Furthermore, since the reinforcing bar of the tension material is hard and heavy, there is a problem that it is a heavy labor to carry and carry it to the enforcement site.

The present invention has been made against the background of such conventional problems. It is possible to improve durability, follow deformation of embankment, reduce weight, and improve transportability and workability. The purpose is to provide a reinforced earth construction method that can be used.

[0005]

According to a first aspect of the present invention, there is provided a reinforced earth construction method of high strength through a connection rod embedded in a wall material made of concrete and an anchor material made of concrete or FRP. A reinforcing soil forming structure manufactured by connecting fibers with a belt-shaped tension material coated with a synthetic resin is arranged with the belt-shaped tension material laid on the soil surface, and the wall surface material is arranged on the slope side of the soil surface. On the other hand, a step of arranging the anchor material inside the wall material, a step of injecting earth and sand from above the belt-shaped tension material and the anchor material inside the wall material, and on the slope. Along with the above, the reinforced soil forming structure is provided with a reinforced soil construction method in which these steps are repeated while sequentially displacing the reinforced soil forming structure inward. The connecting rod referred to here is not limited to a rod in a strict sense, and may include other connectable shapes such as hook-shaped and block-shaped members.

Further, in the reinforced earth work method according to the second aspect of the present invention, a concrete wall material and an anchor material made of concrete or FRP are bridged over both ends of the embedded rods, respectively, A relatively long loop-shaped belt-shaped tension member having a relatively short loop-shaped belt-shaped tension member coated with strong fibers with a synthetic resin through a connecting base portion in which a bridging rod is inserted into the distal end portion. In the state in which the relatively long belt-shaped tension member is laid on the soil surface, the wall material is arranged on the slope side of the soil surface while the reinforcing soil forming structure manufactured by connecting by The inside of the wall material, the inside of the wall material, the step of charging earth and sand from above the belt-shaped tension material and the anchor material, and along the slope, the reinforced soil Forming structure sequentially inward There is provided a reinforced soil construction method, which comprises forming a embankment Repeat these steps with Rashi. It should be noted that the embedded rod and the bridging rod here are not necessarily limited to the rods in a strict sense, and include other connectable shapes such as hook-shaped and block-shaped members.

[0007]

In the reinforced soil construction method according to claims 1 and 2, for example, in a factory, a wall material and an anchor material are connected in advance by a belt-shaped tension material in which high-strength fibers are coated with a synthetic resin to form a reinforced soil forming structure. Since the body can be manufactured and carried to the site of enforcement, the field of implementation can be improved. Moreover, since the belt-shaped tension member is a light and flexible member, the tension member, and thus the reinforced soil forming structure, are lighter and easier to handle. The enforcement of can be improved.
Then, at the enforcement site, while arranging the belt-shaped tension material on the soil surface, while arranging the wall material on the slope side of the soil surface,
The anchor material is placed inside the wall material to carry out the reinforced soil forming structure, and then earth and sand are put inside the wall material from above the belt-shaped tension material and the anchor material, and then along the slope. Then, these steps are repeated while sequentially shifting the reinforcing soil forming structure inward to form the embankment.

At this time, since a relatively lightweight and flexible belt-shaped tension material in which high-strength fibers are coated with a synthetic resin is adopted as the tension material, the tension material does not rust and the durability is improved. It is also possible to follow the deformation of the embankment. In addition, since the belt-shaped tension member has a structure in which high-strength fibers are coated with synthetic resin, even if the belt-shaped tension member is impacted by protrusions such as stones during execution, the covering synthetic resin will be damaged. The high-strength fiber will not be damaged and the tensile strength after execution will not be lowered only by adding. Further, since the wall materials are sequentially stacked inwardly, even if the embankment is submerged and the belt-shaped tension member is greatly pulled, stress is not concentrated on a specific part of the slope. It is possible to prevent it, to prevent the slope from collapsing, and to suppress the deformation to a relatively small amount.

Further, in the reinforced earthwork method according to the second aspect, since the wall material and the anchor material are respectively provided with the connection base portions and the connection base portions are connected by the loop-shaped belt-shaped tension material, the belt-shaped tension material. Strength is improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the reinforced earthwork method of the present invention will be described below with reference to the drawings. First, the reinforced earthwork method of the first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the reinforced soil construction method of the first embodiment of the present invention is a reinforced soil construction method in which a reinforced soil forming structure A is used to form a five-step embankment. The reinforced soil forming structure A includes a wall material 10 arranged on the slope side of the soil surface, an anchor material 20 arranged on the soil surface inside the wall material 10, the wall material 10 and the anchor material 2.
0 is connected to the connecting rods 11 and 21 embedded in each of the belts 0, and the belt-like tensioning member 30 is connected.

The wall material 10 has a thickness of 150 mm and a height of 1.
The anchor member 20 is a concrete member having a thickness of 150 mm, a height of 200 mm, and a width of 200 mm. However, the anchor material 20 is not limited to this, and may be made of FRP. As shown in FIGS. 2 and 3, the belt-shaped tension member 30 is a total denier 22,0 which is an example of high strength fiber.
Twenty high-strength polyester fibers 31 consisting of 00 de multifilaments are arranged side by side at a pitch of 2.5 mm,
6m in length, 85mm in width, 3mm in thickness, which are integrally covered with polyethylene resin 32, which is an example of synthetic resin,
A belt-shaped member having a tensile strength of 3 tf is used.

As a resin member for civil engineering work, the effect is weak unless it is a filamentary long fiber. This is because in the spun yarn made of short fibers, if the fibers are slippery, they will stretch and it will be difficult to obtain a predetermined strength. Other high strength fibers include ultra high molecular weight polyethylene fibers,
Reinforcing fibers made of a predetermined high-strength material such as organic high-strength fibers such as aramid fibers and wholly aromatic polyester fibers, amorphous metal fibers, and inorganic fibers such as boron fibers can be mentioned. Although the thickness of the high-strength polyester fiber 31 is 22,000 de, the total denier is usually 1,000 to 2,000, without being limited to this.
0 de, preferably 3,000 to 1,000,000 d
It is about e.

As the synthetic resin for covering the high-strength polyester fiber 31, the polyethylene resin 32 has been cited, but the synthetic resin is not limited to this, and is made of thermoplastic synthetic material such as low-density polyethylene, polypropylene, nylon, EVA, or polyvinyl chloride. Resin can also be adopted. The number of high-strength polyester fibers 31 used in the belt-shaped tension member 30 is 20, but the number is not limited to this and may be any number such as 5, 10 or the like. Also, the number of belt-shaped tension members 30 used is one per wall surface,
The number is not limited to this and may be any number such as two or four. Further, although the belt-shaped tension member 30 has a length of 6 m and a tensile strength of 3 tf here, this differs depending on the soil quality of the embankment material, the embankment height, etc., and its length and strength are determined by the stability analysis of the reinforcement embankment. do it.

Next, the reinforcing earthwork method of the first embodiment of the present invention will be explained. As shown in FIG. 2, in the factory, the wall material 10 and the anchor material 20 are connected by the belt-shaped tension material 30 to manufacture the reinforced soil forming structure A in advance. Next, these reinforced soil forming structures A are carried to the site by a truck or the like. As shown in FIG. 1, the wall material 1
0 is arranged on the slope side of the soil surface, and the anchor material 20 is arranged at the back position of the soil surface while pulling the belt-shaped tension member 30 inward. At this point, the belt-shaped tension member 30 is
It is in a state of being horizontally stretched between the wall material 10 and the anchor material 20. Then, the sand S is introduced from above so as to bury the belt-shaped tension member 30 and the anchor member 20 inside the wall member 10 to form the first embankment portion. After that, the reinforced soil forming structure A is sequentially shifted inward along the slope, and the above-described steps are repeated to form a 5-m height, 5-step embankment.

By adopting the belt-shaped tension member 30 instead of the conventional reinforcing bar as the tension member, a tension member which is lightweight and flexible enough not to hinder transportation can be obtained. As a result, assembly at the factory, not at the site of execution, is possible, improving the workability at the site. Note that, similar to this means, it is conceivable to factory-manufacture a conventional reinforced soil forming structure employing a hard and heavy tension material,
In that case, it will inevitably have the problems of increasing the size of the crane device for loading and unloading the carrier and the size of the carrier itself, and it is obvious that it is not realistic in terms of cost. is there.

Further, since the belt-shaped tension member 30 is a light and flexible member, it becomes easy to handle the reinforcing soil forming structure A at the time of execution, and the belt-shaped tension member 30 is made of protrusions such as stones. Even if an impact is applied to the polyethylene resin 32, only the polyethylene resin 32 covering it is scratched, the high-strength polyester fiber 31 is not damaged, and the tensile strength after execution is not reduced. Further, even after this is performed, the tension material is less likely to rust and the durability is improved, and even if the embankment sinks, the belt-shaped tension material 30 bends and easily follows the deformation of the embankment. Furthermore, the wall material 10
Are sequentially stacked inwardly, so that even if the embankment sinks and the belt-shaped tension member 30 is greatly pulled, stress can be prevented from concentrating on a specific part of the slope. It is possible to prevent the slope from collapsing and to suppress the deformation to a relatively small amount.

Next, with reference to FIG. 4, a reinforced earthwork method according to a second embodiment of the present invention will be described. In the reinforced soil construction method of the second embodiment, the reinforced soil forming structure B is attached to the wall material 40 and the anchor material 50 with the connecting base portions 41 and 51, and the connecting base portions 41 and 51 are loop-shaped belt-shaped tension members. The strength of the belt-shaped tension member 60 is improved by connecting with the belt-shaped tension member 60. The connection bases 41 and 51 are respectively the wall members 40.
And embedded rod 4 embedded in anchor material 50
2, 52, and belt-shaped tension members 43, 53 in a short loop extending from both ends of the embedded rods 42, 52.
And the bridging rods 44 and 54 inserted through the tip ends of the belt-shaped tension members 43 and 53. The belt-shaped tension member 60 is bridged between these bridge rods 44 and 54. The configuration and operation other than the above are
Since it is the same as the first embodiment, it will be omitted.

Although the embodiments of the present invention have been described above, the specific configurations and operations are not limited to these embodiments, and even if there are design changes and the like without departing from the scope of the present invention. Included in the present invention. For example, the wall material 10,
The dimensions of the anchor material 20 and the belt-shaped tension material 30 are not limited to those in the embodiment, and may be arbitrary dimensions. Further, in the embodiment, the five-stage type embankment is formed, but the present invention is not limited to this, and the embankment piled up in two, four, or six or more stages may be used. Furthermore, although the example in which the wall material 10, the anchor material 20, and the belt-shaped tension material 30 are assembled in advance in the factory has been described in the embodiment, these materials may be assembled in the field.

[0019]

As described above, in the reinforced soil construction method according to the first and second aspects, the wall material and the anchor material are thus connected by the belt-shaped tension material in which the high-strength fiber is coated with the synthetic resin. Since the step of arranging the reinforced soil forming structure manufactured as described above on the soil surface and the step of charging the earth and sand inside the wall material are sequentially repeated to form the embankment,
The durability can be improved, the deformation of the embankment can be followed, the weight can be reduced, and the transportability and the workability can be improved.

Particularly, in the reinforced earthwork method according to claim 2, since the connection bases are attached to the wall material and the anchor material, respectively, and both connection bases are connected by the loop-shaped belt-like tension member, the belt-like tension is obtained. The strength of the material can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state of embankment formation by a reinforced earth method according to a first embodiment of the present invention.

FIG. 2 is a vertical enlarged cross-sectional view of a reinforced soil forming structure used in the reinforced soil construction method of the first embodiment.

FIG. 3 is an enlarged cross-sectional view of a reinforced soil forming structure.

FIG. 4 is an enlarged vertical cross-sectional view of a reinforced soil forming structure used in the reinforced soil construction method of the second embodiment of the present invention.

FIG. 5 is an enlarged cross-sectional view of a reinforced soil forming structure.

[Explanation of symbols]

 10 Wall material 11 Connecting rod 20 Anchor material 21 Connecting rod 30 Belt-shaped tension material 31 High-strength polyester fiber 32 Polyethylene resin 40 Wall material 41 Connection base part 42 Embedded rod 43 Belt-shaped tension material 44 Crossing rod 50 Anchor material 51 Connection base part 52 Embedded rod 53 Belt-shaped tension material 54 Stretching rod 60 Belt-shaped tension material A Reinforced soil forming structure B Reinforced soil forming structure S Sand

Claims (2)

[Claims] 1. A concrete wall material and an anchor material made of concrete or FRP are connected by a belt-shaped tension member in which high-strength fibers are coated with a synthetic resin, via connecting rods embedded in each. The reinforced soil forming structure produced by the above, while the belt-shaped tension member is laid on the soil surface, the wall material is arranged on the slope side of the soil surface, while the anchor material is placed inward of the wall material. A step of disposing, a step of injecting earth and sand from above the belt-shaped tension material and the anchor material to the inside of the wall surface material, and along the slope, the reinforcing soil forming structure, A reinforced earthwork method characterized in that the embankment is formed by repeating these steps while shifting toward each other. 2. A comparatively high-strength fiber coated with a synthetic resin, in which a concrete wall material and a concrete or FRP anchor material are hung on both ends of an embedded rod embedded in each. Reinforced soil forming structure manufactured by connecting with a relatively long loop-shaped belt-shaped tension member through a connection base in which a bridging rod is inserted at the tip of a short loop-shaped belt-shaped tension member In the state where the body is laid on the soil surface with the relatively long belt-shaped tension material, the wall material is arranged on the slope side of the soil surface, while the anchor material is arranged inward of the wall material. A step, inward of the wall material, a step of charging earth and sand from above the belt-shaped tension material and the anchor material, and along the slope, the reinforced soil forming structure sequentially inward Repeat these steps while shifting Reinforced soil construction method and forming the embankment Te.