JP2004204522A - Natural-ground reinforced earth method and natural-ground reinforced earth member used for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a natural-ground reinforced earth method, in which the integrality of a ground and the natural-ground reinforced earth member is improved by preventing a dispersion into the ground of self-hardening fillers and the development of the crack of the fillers, the solidification strength of the fillers is enhanced by promoting the discharge of excess water or the like and the ground such as a face of a slope is stabilized, and a natural-ground reinforced earth member used for the method. <P>SOLUTION: In the natural-ground reinforced earth method in which a baggy body 3 in which a front end section having approximately the same length as the excavation length L of the excavated pit 2 is closed is inserted into the pit 2 formed by drilling the ground 1 and self-hardening fillers 5 are injected into the baggy body 3, the diameter of the baggy body 3, in which the fillers 5 are injected, is expanded at a value larger than the diameter D of at least the pit 3 extensively over an overall length by pressing and injecting the fillers 5 while a drainage material 4 is disposed extensively over the overall length on the surface of the baggy body 3. In the method, the baggy body is installed so that the end section of the material 4 is led out outside the pit 2. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a ground reinforcement method and a ground reinforcement member used for the method, by preventing the self-hardening filler from dispersing into the ground and generating cracks in the solidified self-hardening filler, whereby the ground and the ground are protected. A soil reinforcement method that enhances the integration with the reinforcing soil member and promotes the discharge of surplus water, etc., thereby increasing the solidification strength of the self-hardening filler material and stabilizing the ground such as slopes. The present invention relates to a ground reinforcing soil member used in the method.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a ground reinforcement method has been widely used to prevent collapse of a ground made of an embankment, a cut, or the like.
This ground reinforcement method involves reinforcing the ground by inserting a reinforcing material such as reinforcing steel into the excavation hole formed by drilling the target ground, and injecting a self-hardening filler, thereby reinforcing the ground. (See Patent Literature 1 and Patent Literature 2).
[0003]
By the way, in the above-mentioned conventional ground reinforcement method, the self-hardening filler is directly injected into the excavation hole formed by drilling the ground. However, there are problems such that the desired reinforcing strength cannot be obtained and cracks occur in the solidified self-hardening filler.
Furthermore, surplus water generated when the cement-based self-hardening filler material, which is widely used as a self-hardening filler material, solidifies, penetrates into the ground side, and is leached from the ground side, causing an interface between the ground and the solidified self-hardening filler material. However, there was a problem that the adhesive strength and the shearing force of the ground became weak, and the desired reinforcing strength could not be obtained.
[0004]
Although it relates to an earth anchor, in order to prevent the diffusion of the self-hardening filler into the ground and the occurrence of cracks in the solidified self-hardening filler, the applicants have perforated the ground first. A method has been proposed in which a bag-like material having a closed end is inserted into the formed excavation hole and a self-hardening filler is injected into the bag-like material (see Patent Document 3). The problem that excess water and leaching water from the ground side generated when the hard filler solidifies weakens the adhesive force at the interface between the ground and the hardened self-hardening filler material and the shear force of the ground is still solved. It was not possible, and a response was requested.
[0005]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-303480 [Patent Document 2]
JP 2002-4276 A [Patent Document 3]
Japanese Utility Model Laid-Open No. 1-160032 [0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above-mentioned problems of the conventional ground-reinforcement soil construction method, and prevents the self-hardening filler from dispersing into the ground and the occurrence of cracks in the solidified self-hardening filler, whereby the ground and the ground can be prevented. A soil reinforcement method that enhances the integration with the reinforcing soil member and promotes the discharge of surplus water, etc., thereby increasing the solidification strength of the self-hardening filler material and stabilizing the ground such as slopes. It is an object of the present invention to provide a ground reinforcing soil member used for it.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the ground reinforcement method according to the present invention inserts a bag-like material having a tip end substantially the same length as the excavation length of the excavation hole into an excavation hole formed by drilling the ground. And, in the ground reinforcement method of injecting a self-hardening filler into the bag-like material, the self-hardening filler is injected under pressure, so that the bag-like material injected with the self-hardening filler is extended over its entire length. The drainage material is disposed on the surface of the bag-like material over the entire length thereof, and the end of the drainage material is led out of the borehole. It is characterized in that a bag-like material is installed in the bag.
[0008]
According to this ground-reinforcement soil method, a bag-shaped object having a tip end substantially the same as the excavation length of the hole is inserted into a hole formed by drilling the ground, and the bag-shaped object is automatically inserted into the bag-shaped object. In the ground reinforcement reinforced earth method of injecting a hard filler, by injecting the self-hardening filler under pressure, the bag-like material into which the self-hardening filler has been injected is at least larger than the diameter of the excavation hole over its entire length. The diameter of the self-hardening filler is prevented from dissipating into the ground and cracking of the solidified self-hardening filler is prevented by expanding the diameter of the bag filled with the self-hardening filler. In addition, the surrounding ground is compacted, and further, drainage from the ground can be promoted.
Then, a drainage material is disposed on the surface of the bag-like material over the entire length thereof, and the bag-like material is placed so that the end of the drainage material is led out of the drilling hole, whereby the cement-based self-adhesive material is drained. Excess water and leaching water from the ground side generated when the hard filler is solidified can be discharged to the outside of the excavation hole through the self-hardening filler and a drainage material in close contact with the ground.
[0009]
In this case, a reinforcing material can be inserted into the bag.
[0010]
This makes it possible to reinforce the self-hardening filler, reinforce the surrounding ground with the reinforcing material, and further enhance the stability of the entire ground.
[0011]
In addition, a bag-like material narrowed down at least at a mouth portion can be used.
[0012]
This makes it possible to further improve the adhesive force at the interface between the self-hardening filler in which the bag-like material has solidified and the ground and the shearing force of the ground.
[0013]
In addition, a bag-shaped material having an uneven shape can be used.
[0014]
Thereby, the adhesive force at the interface between the ground and the solidified self-hardening filler can be further improved.
[0015]
Further, as the drainage material, a laminate in which a grid material made of a synthetic resin net is placed inside and a sheet material made of a synthetic fiber cloth is placed outside can be used.
[0016]
As a result, even when a large pressure is applied from the ground, surplus water and leachate from the ground side generated when the cement-based self-hardening filler solidifies can be smoothly discharged to the outside of the borehole through the drainage material. it can.
[0017]
In addition, the ground reinforcing soil member of the present invention used in the ground reinforcing soil construction method is inserted into an excavation hole formed by piercing the ground, a cement-based self-hardening filler is injected, and a fiber with a closed end is closed. A ground reinforcement member made of a bag-shaped material made of plastic, characterized in that a drainage material is provided on the surface of the bag-shaped material over the entire length thereof.
[0018]
Since the ground reinforcing soil member is provided with drainage material on the surface of the bag-like material over the entire length thereof, the bag-like material having the drainage material provided on the surface is provided with a drainage material ground. The ground reinforcement method of the present invention can be simply and smoothly carried out simply by inserting into the drilled hole formed by drilling.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a ground reinforcing soil method of the present invention and a ground reinforcing soil member used therefor will be described with reference to the drawings.
[0020]
FIG. 1 shows an embodiment of the construction process of the ground reinforcement method according to the present invention.
This ground reinforcement method is intended to prevent the collapse of the ground 1 consisting of embankments, cuts, etc. First, a large number of excavation holes 2 are formed substantially horizontally with respect to the ground 1 in the vertical and horizontal directions. At predetermined intervals, holes are drilled using a drilling tool such as a hand auger or a drill (FIG. 1A).
In this case, the diameter D and the excavation length L of the excavation hole 2 are designed in accordance with the reinforcement strength, the properties of the ground, and the like to be obtained by the ground reinforcement method. Is set to about φ80 to φ100 mm, and the excavation length L is set to about 3 to 5 m.
[0021]
Into the drilling hole 2 formed in this way, a bag-like material 3 having a closed end portion having substantially the same length as the drilling length L of the drilling hole 2 is inserted. The filling material 5 is injected under pressure (FIG. 1 (b-1)). A mouthpiece 30a for connecting the fitting 30b of the injection hose for the self-hardening filler 5 can be attached to the mouth of the bag-shaped material 3 as necessary. Can be smoothly injected.
Then, by injecting the self-hardening filler material 5 into the bag-shaped material 3 under pressure, the bag-shaped material 3 into which the self-hardening filler material 5 is injected is made larger than at least the diameter D of the excavation hole 2 over the entire length thereof. The diameter is increased (FIG. 1 (b-2)).
[0022]
In this case, if necessary, the reinforcing member 6 such as a reinforcing bar is inserted into the bag-like material 3 in a state where the reinforcing member 6 is supported by the spacer 61 so that the reinforcing member 6 is located substantially at the center of the excavation hole 2. Can be.
In the present embodiment, as the reinforcing material 6, a deformed steel bar (for example, D19, D22, etc.) having good adhesion of the self-hardening filler 5 is used. Any cross-sectional shape such as steel or H-shaped steel can be used. Further, besides those made of steel, those made of FRP can be used.
This makes it possible to reinforce the self-hardening filler, reinforce the surrounding ground with the reinforcing material, and further enhance the stability of the entire ground.
[0023]
By the way, the bag-like material 3 used in the present embodiment is made of a synthetic fiber woven fabric and has a narrowed mouth and a tip as shown in FIG. 2A (warp yarn 31: nylon 1400T / 4 × 320 yarns, weft yarn 32: polyester 1100T / 4, 8 yarns / cm (density of large diameter portion (φ180 mm)), 4.5 yarns / cm (density of small diameter portion (φ80 mm)), FIG. ), Those having irregularities (those having different diameters in the longitudinal direction (large-diameter portion φ130 mm, small-diameter portion φ80 mm)) can be suitably used.
As described above, by using the bag-shaped material 3 whose mouth portion is narrowed down, the pressure injection of the self-hardening filler into the bag-shaped material 3 can be performed smoothly, and The diameter expansion can be performed uniformly over the entire length of the bag-like material 3, and the adhesive force at the interface between the ground 1 and the solidified self-hardening filler material 5 and the ground shearing force can be improved. The use of the material 3 having an uneven shape can improve the adhesive force at the interface between the ground 1 and the solidified self-hardening filler 5.
[0024]
Further, the bag-shaped material 3 used in the present embodiment has a drainage material 4 disposed on its surface over the entire length thereof, and an end of the drainage material 4 is led out of the drilling hole 1. So that the bag-like material 3 is installed.
Thereby, even when a large pressure is applied from the ground 1, as shown in FIGS. 1 (c-1) and (c-2), the excess water generated when the cement-based self-hardening Leachate can be discharged smoothly to the outside of the borehole 2 through the drainage material 4.
[0025]
As shown in FIG. 1 (d), excess water or leaching is applied to the mouth (the mouthpiece 30 a) of the bag-like material 3 installed so that the end of the drainage material 4 is led out of the excavation hole 1. The cap 7 is arranged so as not to hinder the discharge of water.
[0026]
As shown in FIG. 3, the drainage material 4 disposed on the surface of the bag 3 used in the present embodiment includes a synthetic resin net (high-density polyethylene net, net wire diameter φ1 mm, mesh size 6). A laminate having a grid material 41 made of (× 6 mm) inside and a sheet material 42 made of synthetic fiber cloth (woven or non-woven fabric made of polyester long fiber) laminated outside can be used.
Further, as shown in FIG. 3A, the drainage member 4 is configured such that a sheet-like laminate composed of a grid member 41 and a sheet member 42 is disposed on the surface of the bag-like material 3, or as shown in FIG. As shown in ()), the sheet-like grid member 41 can be inserted into a tubular sheet member 42 and disposed so as to cover the surface of the bag-like material 3.
[0027]
More specifically, as shown in FIG. 4A, the bag-shaped material 3 and the drainage material 4 are inserted into the bag-shaped material 3 with the reinforcing material 6 inserted into the bag-shaped material 3. A tape 8 such as a vinyl tape that can be stretched or broken so that the bag 3 can be expanded in diameter when the self-hardening filler 5 is injected under pressure (hereinafter, simply referred to as “vinyl tape 8”). Then, the bag-shaped material 3 is arranged so as to cover the surface of the bag-shaped material 3 with a sheet-shaped grid material 41 inserted into a cylindrical sheet material 42 (FIG. 3B). A cylindrical integral structure is formed, and the integral structure is inserted into the excavation hole 2 or, as shown in FIG. Material 41, and the outer periphery thereof is wound with a belt-shaped sheet material 42. To form a cylindrical integral structure, and insert the integral structure into the excavation hole 2 or, as shown in FIG. A sheet-like laminate (FIG. 3 (c)) (three sheet-like pieces in this example) composed of a grid material 41 and a sheet material 42 is provided, and the outer periphery thereof is wound with a vinyl tape 8. A cylindrical integrated structure is formed, and the integrated structure is inserted into the drilling hole 2. Further, as shown in FIG. A sheet-like (band-like) laminate (FIG. 3 (c)) (in this example, two belt-like bodies) composed of the material 41 and the sheet material 42 is wound in a cross-like shape and arranged, thereby providing a cylindrical shape. It is possible to form an integrated structure, and insert this integrated structure into the drill hole 2.
Here, as shown in FIG. 4 (d), the self-hardening filler 5 is injected into the bag 3 by pressure by winding the sheet-like (strip-like) laminate in a cross-like manner. When the bag-shaped material 3 expands into an uneven shape by this, it collects in the concave portion of the bag-shaped material 3 and removes excess water or leaching water from the ground side generated when the cement-based self-hardening filler material that easily stays solidifies. It can be quickly and smoothly discharged out of the excavation hole 1 through the drainage material 4.
[0028]
By the way, in the above-described embodiment, the bag-shaped material 3 and the drainage material 4 are formed as separate members, but the bag-shaped material and the drainage material may be integrally formed.
Specifically, as shown in FIG. 5, a ground structure is formed by using multifilaments for the warp yarns 31 and the weft yarns 32, and the warp yarns 41 a formed of monofilaments (about φ1 mm) functioning as drainage materials are woven. The bag-like material 3A having a heavy tissue and the bag-like material 3B made of a synthetic fiber fabric as shown in FIGS. 2A and 2B are used in an overlapping manner.
In this case, the reinforcing material 6 is inserted into the double-structured bag-shaped material 3A, the bag-shaped material 3B made of a synthetic fiber woven fabric is superposed on the outer periphery thereof, and the bag-shaped material 3B is wound with a vinyl tape 8 and stopped. The integrated structure is formed into a shape, and the integrated structure is inserted into the drill hole 2.
In addition, a sheet material made of a synthetic fiber cloth (a woven or non-woven cloth made of polyester long fiber) may be further disposed on the surface of the surface of the bag-like material 3B and wound with a vinyl tape 8 to stop.
In this way, by forming the bag-like material and the drainage material integrally, it is possible to prevent the bag-like material and the drainage material from being separated from each other and to form a gap. The surplus water and the seepage water generated from the ground side can be quickly and smoothly discharged out of the excavation hole 1.
[0029]
As described above, this ground-reinforcement soil method uses a bag-like material 3 (see FIG. 1) in which a tip having a length substantially equal to the excavation length L of the excavation hole 2 is closed in the excavation hole 2 formed by drilling the ground 1. 3A, 3B), and injects the self-hardening filler 5 into the bag-like material 3 and injects the self-hardening filler 5 by pressure injection of the self-hardening filler 4 in the ground reinforcement method. The expanded bag-shaped material 3 is expanded at least larger than the diameter D of the excavation hole 2 over the entire length thereof, so that the self-hardening filler material 5 is dissipated into the ground 1 or the solidified self-hardening filler material. 5 can be prevented from occurring, and the surrounding ground 1 can be compacted and the drainage from the ground 1 can be promoted by expanding the diameter of the bag-like material 3 into which the self-hardening filler 5 has been injected.
A drain 4 (41a) is provided on the surface of the bag 3 (3A) over the entire length thereof, and the end of the drain 4 is led out of the drill hole 2. 3, the excess water generated when the cement-based self-hardening filler is solidified and the leachate from the ground 1 are removed through the self-hardening filler 5 and the drainage material 4 which is in close contact with the ground 1. 2 can be discharged outside.
[0030]
As described above, the ground reinforcing soil method and the ground reinforcing soil member used in the present invention have been described based on the embodiments. However, the present invention includes the configurations (materials of constituent members and numerical values) described in the above embodiments. The configuration is not limited to the above, and the configuration can be appropriately changed without departing from the gist of the invention.
[0031]
The name of the present invention, “the ground reinforcement soil method and the ground reinforcement soil member used therefor” is merely used to clarify its main use. In addition, the present invention can be applied to a similar construction method such as an earth anchor construction method using an earth anchor 9 as shown in FIG. 6, but this is not excluded.
[0032]
【The invention's effect】
The ground reinforcement method according to the present invention includes the steps of: inserting a bag-like object having a tip end substantially the same length as the excavation length of the hole into a drilling hole formed by drilling the ground; In the ground reinforcement method of injecting a self-hardening filler into the ground, the self-hardening filler is injected under pressure so that the bag-like material into which the self-hardening filler has been injected is at least cut into the diameter of the excavation hole over its entire length. The diameter of the self-hardening filler is prevented from dissipating into the ground and cracking of the solidified self-hardening filler is prevented. Depending on the diameter, the surrounding ground can be compacted, and further, drainage from the ground can be promoted.
Then, a drainage material is disposed on the surface of the bag-like material over the entire length thereof, and the bag-like material is placed so that the end of the drainage material is led out of the drilling hole, whereby the cement-based self-adhesive material is drained. Excess water and leaching water from the ground side generated when the hard filler is solidified can be discharged to the outside of the excavation hole through the self-hardening filler and a drainage material in close contact with the ground.
By these means, surplus water and leachate are discharged in a short time to speed up the development of the strength of the self-hardening filler, and the adhesive force at the interface between the self-hardening filler solidified through the bag-like material and the ground, The shear strength of the ground can be improved, the desired reinforcement strength can be obtained without being affected by the properties of the ground, surplus water, etc., the ground can be reinforced in a short construction period, and the stability of the whole ground Can be reliably increased.
In addition, it is possible to prevent excess water (cement alkaline water) generated when the cement-based self-hardening filler solidifies from penetrating into the ground, and to maintain the surrounding environment.
[0033]
Further, by inserting a reinforcing material into the bag-like material, the self-hardening filler is reinforced, and the surrounding ground is reinforced by the reinforcing material, so that the stability of the entire ground can be further enhanced.
[0034]
In addition, by using a bag-shaped material that is squeezed at least at the mouth, pressure injection of the self-hardening filler into the bag-shaped material can be performed smoothly, and the diameter of the bag-shaped material can be increased. It can be performed uniformly over the entire length of the bag-like material, and the adhesive force at the interface between the ground and the solidified self-hardening filler and the shearing force of the ground can be further improved.
[0035]
Further, by using a bag-shaped material having an uneven shape, the adhesive force at the interface between the ground and the solidified self-hardening filler can be further improved.
[0036]
In addition, even when a large pressure is applied from the ground, by using a laminate in which a grid material made of a synthetic resin net is placed on the inside and a sheet material made of a synthetic fiber cloth is placed on the outside, the drainage material is used. Excess water and leaching water from the ground side generated when the cement-based self-hardening filler solidifies can be smoothly discharged to the outside of the borehole through the drainage material.
[0037]
Further, according to the ground reinforcing soil member of the present invention, since the ground reinforcing soil member is provided with a drainage material over the entire length of the surface of the bag-like material, the drainage material is provided on the surface. The ground reinforcement method of the present invention can be carried out simply and smoothly simply by inserting the bag-like material provided with the hole into the excavation hole formed by piercing the drainage material ground.
[Brief description of the drawings]
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a construction step of a ground reinforcement method according to the present invention, wherein (a) is a perforation step, (b-1) is a step of inserting a bag-like material and injecting a self-hardening filler under pressure. , (B-2) is an enlarged view of the bag-like material, and (c-1) and (c-2) are enlarged views of the portion A of (b-2) when the cement-based self-hardening filler solidifies. FIG. 7 is an explanatory diagram showing a state in which surplus water generated from the ground and seepage water from the ground side are discharged to the outside of the excavation hole through a drainage material, and FIG.
FIG. 2 is an explanatory view of a bag.
FIG. 3 is an explanatory diagram of a drainage material.
FIG. 4 is an explanatory view showing a combination of a bag and a drainage material.
5A and 5B show a case where a bag-like material and a drainage material are integrally formed, (a) is an installed state, (b) is a mouth portion of the bag-like material, and (c) is a cross-sectional view taken along line AA of (a). (D) is an explanatory view showing an assembling process.
FIG. 6 is an explanatory view of an earth anchor method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ground 2 Drilling hole 3 Bag-shaped material 3A Bag-shaped material 3B Bag-shaped material 4 Drainage material 41 Grid material 41a Warp yarn made of monofilament 42 Sheet material 5 Self-hardening filler 6 Reinforcement 7 Cap 8 Vinyl tape

Claims (6)

A ground material in which a bag-like material having a tip portion substantially the same length as the drilling length of the drilling hole is inserted into a drilling hole formed by drilling the ground, and a self-hardening filler is injected into the bag-like material. In the reinforced earth method, by injecting the self-hardening filler under pressure, the bag-like material into which the self-hardening filler is injected is expanded over its entire length at least larger than the diameter of the excavation hole. Drainage material is disposed on the surface of the object over the entire length thereof, and a bag-like material is installed so that an end of the drainage material is led out of the excavation hole. . The method according to claim 1, wherein a reinforcing material is inserted into the bag-like material. 3. The method of reinforcing soil in the ground according to claim 1, wherein the bag-like material is narrowed down at least at a mouth portion. 4. The method of reinforced earth construction according to claim 1, wherein the bag-like material has an uneven shape. 5. The drainage material is a laminate in which a grid material made of a synthetic resin net is laminated on the inside and a sheet material made of synthetic fiber cloth is laminated on the outside. The ground reinforcement method described. Insert the ground into the excavation hole formed by drilling, cement-based self-hardening filler is injected, in the ground reinforcement member consisting of a fiber bag-like material with a closed end, on the surface of the bag-like material, A soil reinforcement material comprising a drainage material disposed over the entire length thereof.

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