JP2938756B2 - Structure of reinforced ground - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to ground reinforcement.

[0002]

2. Description of the Related Art Conventionally, it has been proposed to mix and disperse a large number of geotextile tubular bodies in the soil constituting the ground in order to reinforce the supporting ground for structures and the ground formed by embankment. JP-A-5-255922.

[0003]

However, in order for the conventional reinforcing ground to exhibit a predetermined reinforcing effect, it is necessary that a large number of the cylindrical bodies be uniformly mixed and dispersed in the soil. Therefore, it is difficult in construction to uniformly disperse the tubular body in the soil.

Accordingly, it is an object of the present invention to provide an improved reinforced ground structure. Another object of the present invention is to provide a reinforced ground that can be easily constructed.

[0005]

The structure of the reinforced ground according to the present invention comprises one or a plurality of reinforcing members arranged inside the ground or spaced apart from each other in the horizontal direction. It comprises a geotextile tubular body oriented in a direction, earth and sand filled in the tubular body, and the reinforcing material has a height dimension not less than its diameter.
The reinforced ground structure of the present invention may further include a geotextile sheet or net disposed on the plurality of reinforcing members and fixed to each reinforcing member. Another reinforced ground of the present invention includes a footing mounted on and fixed to the stiffener. The ground to be reinforced includes an embankment.

[0006]

According to the present invention, according to the present invention, a geotextile cylindrical body oriented vertically inside the ground and a soil or sand filled in the cylindrical body are spaced apart from each other in the horizontal or horizontal direction. As a result of arranging a plurality of reinforcing members placed, the ground is reinforced, a wedge-shaped sliding surface generated inside the ground due to a load occurs below the reinforcing members,
The weight of the earth mass above the wedge-shaped sliding surface and the movement resistance along the sliding surface increase. This increases the ground's bearing capacity and stability. The reinforcing material is deformed in a direction in which the diameter increases when it is subjected to an axial force due to the load described above. It can be deformed following the deformation of the surrounding ground. Furthermore, since the reinforcing material has substantially the same specific gravity as the soil of the surrounding ground, settlement by its own weight is prevented. From these, it is possible to maintain the reinforcing member in a fixed position without causing the destruction of the reinforcing member, and thereby it is possible to maintain the reinforcement of the ground constant. Furthermore, since the reinforcing material is such that the filling soil is restrained by the tubular body and maintains its rigidity, regardless of the soil quality of the filling soil, and therefore preferably the soil quality of the ground to be reinforced, which is a source of the filling soil, The present invention can be applied.

Further, according to the present invention, the work of embedding the reinforcing material comprising the geotextile tubular body and the earth and sand filling the same in the ground involves uniformly placing a large number of geotextile tubular bodies in the soil. It is easier than the construction work of the conventional reinforcing ground to be dispersed.

[0008] In the present invention, since the height of the reinforcing member is greater than the diameter thereof, the length of the reinforcing member for securing the packed earth and sand more securely in the tubular body is reduced. Can be given. Further, when a geotextile sheet is arranged on these reinforcing members and fixed to each reinforcing member, the sheet resists the shearing force acting on the ground, so that a higher reinforcing effect can be obtained.

Further, according to the present invention, since the footing is placed and fixed on the reinforcing member, the footing can be prevented from being settled unequally by the supporting action of the reinforcing member. In the case of the ground, the rotation of the footing and the destruction of the ground accompanying the rotation can be prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a reinforced ground 1 according to the present invention is shown.
The structure of 0 is shown schematically. The reinforcing ground 10 includes a plurality of reinforcing members 14 arranged at intervals in the horizontal direction within the original ground 12 to firmly fix an earth structure such as an embankment 16 installed thereon, a building, and the like. To support.

The arrangement of the reinforcing members 14 can be arbitrarily determined. Preferably, they are arranged as shown in FIG. 2 or staggered (not shown). Each reinforcing member 14 includes a cylindrical body 18 (FIG. 3) made of geotextile (such as a fiber cloth for civil engineering or a cloth made of a polymer material) and earth and sand (not shown) filled in the cylindrical body 18. The illustrated cylindrical body 18 has a cylindrical surface having a mesh, and both open end surfaces thereof are vertically oriented.

In order to form the reinforcing ground 10, the original ground 12
Is excavated to form a recess (not shown), and a plurality of tubular bodies 18 are installed in the recess in the vertical direction. Next, the plurality of cylindrical bodies 18 are sequentially filled with earth and sand (not shown), preferably excavated earth and sand of the original ground 12, from the open upper end, and the earth and sand are compacted. Thereafter, the recess is backfilled. Thereby, the cylindrical body 18 filled with earth and sand is covered with earth and sand. Next, the backfilled earth and sand covering the cylindrical body 18 is compacted to complete the ground reinforcement. The earth and sand to be filled in the tubular body 18 and the earth and sand for backfilling are replaced with the above-mentioned excavated earth and sand,
Those brought in from other places can be used.

The load of the embankment 16 built on the reinforced ground 10 is transmitted to the lower ground via the reinforcing member 14, and the reinforcing member 1
A wedge-shaped sliding surface appears below the installation surface of No. 4. The level of the sliding surface is lower than that when the embankment is constructed on the original ground 12 having no reinforcing material 14. For this reason, it is possible to increase the weight of the earth mass above the wedge-shaped sliding surface under the reinforcing material 14 and to increase the movement resistance of the earth mass along the sliding surface with the increase, that is, it is possible to reinforce the ground 12. . When the load described above acts on the reinforcing ground 10, the reinforcing material is deformed in a direction in which the diameter increases, and opposes the load described above. More specifically, the columnar filled earth and sand of the reinforcing member 14 expands laterally by receiving a compressive force in a vertical direction. At this time, the tubular body 18 made of geotextile suppresses the bulging of the filled earth and sand, suppresses a change in shape of the reinforcing member 14, and maintains its rigidity.

The reinforcing member 14 composed of the tubular body 18 and the earth and sand filled therein is lighter than the case where it is formed of, for example, a concrete block, and its weight is almost the same as the earth and sand of the surrounding ground 12. As a result, the sinking of the reinforcing member 14 itself does not occur. Moreover, the reinforcing member 14 has a deformability capable of following the deformation of the surrounding ground 12. From this, the reinforcing material 1
4 is maintained at a predetermined position, and contributes to reliable reinforcement of the ground 12.

[0015] The cylindrical geotextile or tube 18 has a height dimension greater than its diameter. By setting the dimensions as described above, it is possible to more reliably restrain the packed earth and sand by the tubular body 18.

As shown in FIG. 4, a sheet net 20 or a net made of geotextile can be arranged on a plurality of reinforcing members 14, and the sheet 20 can be fixed to each reinforcing member 14 by sewing with a thread, for example. Sheet 20 is
The reinforcing material 14 occupying a fixed position in the soil prevents the ends of the soil from moving in the horizontal direction, and resists the shearing of the ground 12 caused by the load described above.
2 is more strongly reinforced.

As shown in FIG. 5, a footing 22 as a foundation of a building can be placed on the reinforcing member 14 and fixed to the reinforcing member 14. The footing 22 is formed, for example, by casting concrete in a state where the top of the reinforcing member 14 is exposed from the ground. According to this, the footing 22 is supported by the reinforcing member 14 and uneven settlement is prevented. When the ground 12 is soft, the rotation of the footing 22 and the destruction of the ground 12 due to the rotation of the footing 22 are prevented.

As shown in FIG. 6, the ground to be reinforced is an embankment 16 formed on the ground 12, a plurality of reinforcing members 14 are installed in the embankment 16, and these are filled with earth and sand necessary for constructing the embankment 16. Can be covered. In this case, the reinforcing member 14 is disposed on the ground 12 or on the soil forming part of the embankment 16. The formation of the reinforcing member 14 at this time is performed in the same manner as described above.

The number of the reinforcing members 14 may be one instead of the illustrated example in which the reinforcing members are plural. Reinforcement 14
Can be set to, for example, 10 to 500 cm. When a single reinforcing member is arranged, needless to say, a larger diameter is set than when a plurality of reinforcing members 14 are arranged. Further, the interval between the plurality of reinforcing members 14 is preferably set to be twice or less the diameter of each reinforcing member 14.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a reinforced ground.

FIG. 2 is a cross-sectional view of a reinforcing ground showing an example of arrangement of a plurality of reinforcing members.

FIG. 3 is a schematic perspective view of a cylindrical geotextile.

FIG. 4 is a schematic longitudinal sectional view of another example of a reinforced ground.

FIG. 5 is a schematic longitudinal sectional view of another example of a reinforced ground.

FIG. 6 is a schematic longitudinal sectional view of another example of the reinforcing ground.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Reinforced ground 12 Original ground 14 Reinforcement material 16 Embankment 18 Cylindrical geotextile 20 Sheet-shaped geotextile

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenichiro Ozaki 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Co., Ltd. Kumagaya Gumi Tokyo headquarters (56) References JP-A-3-36320 (JP, A) JP-A-2-261103 (JP, A) JP-A-58-101932 (JP, A) JP-A-5-255922 (JP, A) JP-A-61-21219 (JP, A) (58) Fields investigated (Int) .Cl. ⁶ , DB name) E02D 3/00 102 E02D 17/18

Claims (4)

(57) [Claims] 1. A geotextile tubular body including one or a plurality of horizontally spaced reinforcing members disposed inside a ground, wherein the reinforcing members are oriented vertically. Consisting of earth and sand filled in the shape,
A reinforced ground structure in which the reinforcing material has a height dimension equal to or greater than its diameter. 2. The structure of a reinforced ground according to claim 1, further comprising a geotextile sheet or net disposed on said plurality of stiffeners and secured to each stiffener. 3. A method comprising: one or a plurality of reinforcing members disposed inside the ground and spaced apart from each other in a horizontal direction; and a footing mounted on the reinforcing member and fixed thereto. A reinforcing ground structure comprising a geotextile tubular body in which the reinforcing material is directed vertically, and earth and sand filled in the tubular body. 4. The structure of a reinforced ground according to claim 3, wherein the reinforcing material has a height dimension equal to or greater than its diameter.