JP2617628B2 - Backfilling method of rigid wall with reinforced soil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a backing structure such as an abutment, a retaining wall, a culvert or the like having a rigid wall by using a reinforcing soil.

[0002]

2. Description of the Related Art A so-called reinforcing earth method in which a sheet-like reinforcing material a such as a nonwoven fabric or a polymer grid is laid in the soil is a method for improving the shear resistance of the entire reinforcing soil b by tensile stress generated in the reinforcing material. However, if the rigid wall c is not displaced or deformed forward (so-called working side), no tensile strain is generated in the sheet-like reinforcing material laid in the backfill reinforcing soil b. In order to generate tensile stress in the reinforcing material, it is necessary to allow a certain degree of deformation of the soil at the portion where the reinforcing material is laid. (See FIGS. 5 and 6.) As shown in FIG. 5D, the wall and the reinforcing member are not connected. Therefore, from the viewpoint of reducing the earth pressure on the back surface of the wall, the application has been limited only to the application to so-called flexible retaining walls that allow displacement to the working side, such as block product and tail armature.

[0003]

As described above, from the viewpoint of reducing the earth pressure on the back surface, the application of the reinforcing soil using the sheet-like reinforcing material to the backfill of the wall is limited to the flexible retaining wall.
Therefore, for rigid walls such as abutments, RC retaining walls, box sculverts, etc., which have relatively high rigidity and which are less displaced to the working side during backing work, the normal construction method, that is, It is difficult to achieve the effect only by laying the reinforcing material in layers.

[0004] The present invention has been proposed in view of the above-mentioned problems of the prior art, and its object is to provide a sheet-like reinforcement for backing a rigid wall, which was conventionally considered to be ineffective. It is an object of the present invention to provide a method for backfilling a rigid wall with a reinforced soil, which makes it possible to apply a reinforced soil made of a material, reduce back earth pressure, and stabilize backfill.

[0005]

According to the present invention, there is provided a construction method comprising:
In the backfilling method of the rigid wall performing backfilling with the reinforcing soil using the sheet-like reinforcing material, a spacer for space retention is previously installed on the back of the rigid wall in the backfilling construction stage, and then the backside of the spacer is provided. The backfill of the reinforced soil is constructed, and then the spacer is removed to provide a temporary space between the rigid wall and the backfill soil, thereby allowing the backfill soil to deform to the rigid wall side. .

[0006]

According to the present invention, as described above, when backfilling is performed by reinforcing soil using a sheet-like reinforcing material on the back surface of the rigid wall, a space holding spacer is installed on the back surface of the rigid wall. By constructing backfill of reinforcing soil on the back side of the spacer, removing the spacer and temporarily providing a space between the rigid wall and backfill soil, deformation of backfill soil toward the rigid wall side Accordingly, the generation of tensile strain (tensile stress) of the reinforcing material is promoted, and as a result, the earth pressure applied to the back surface of the rigid wall by the reinforcing soil is reduced as compared with the normal backfilling work.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Reference numeral 1 denotes a rigid wall, on the back surface of the rigid wall 1 receiving the earth pressure, a spacer 2 for maintaining a space. (See the first step, FIG. 1) The spacer 2 is made of foamed polystyrene, a wooden formwork, or the like. Also, rubber mats filled with various gases and liquids can be reduced in volume by discharging the internal substance, so that the removal of the spacer 2 is more effective.

Next, the backfill 3 is laid on the back surface of the spacer 2 with a predetermined winding thickness and rolled, and then a sheet-like reinforcing material 4 is laid. Thereafter, by repeating this step, backfill of the reinforced soil is constructed in the same manner as in the usual method. Next, the spacer 2 is removed, and the space 5 created after the removal promotes the deformation of the backfill soil 3. (Refer to FIG. 3 in the third step.) The removal of the spacer 2 is mainly intended to allow the deformation of the backfill 3 to the active side, and the height of the rigid wall 1 and the backfill 3
In consideration of the shear strength and the like of the above, it is appropriately performed at each stage until the final construction of backfill is completed.

After confirming that the deformation δ of the backfill soil 3 to the working side has converged, drainage material such as earth and sand and crushed stone used for backfilling, and filler material such as lightweight artificial embankment material such as foamed polystyrene are used. 6, the space remaining between the rigid wall 1 and the backfill soil 3 is filled to prevent erosion of the backfill tip due to rainwater or the like. (4th process, see FIG. 4)

[0010]

According to the present invention, as described above, at the stage of backfilling the back surface of the rigid wall with the reinforcing soil using the sheet-like reinforcing material, a space holding spacer is previously installed on the back surface of the rigid wall. After that, build a backfill of reinforced soil on the back of the spacer, then remove the spacer to provide a temporary space between the reinforced soil and the rigid wall,
By allowing deformation of the backfill soil to the rigid wall side, the backfill of the rigid wall, which was difficult to apply conventionally,
Backfilling with reinforced soil in which a sheet-like reinforcing material is laid in the soil is possible, and as a result, the earth pressure due to the backfilled soil on the back of the rigid wall is reduced, so that the wall thickness can be reduced, etc. , Can contribute to the economical design and construction of the wall itself.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first step of a method for backfilling a rigid wall with a reinforcing soil according to the present invention.

FIG. 2 is a longitudinal sectional view showing a second step of the method.

FIG. 3 is a longitudinal sectional view showing a third step of the method.

FIG. 4 is a longitudinal sectional view showing a fourth step of the method.

FIG. 5 is a schematic sectional view of a rigid wall, backfill soil, and a sheet-like reinforcing material.

FIG. 6 is an explanatory diagram of a reinforcing effect by backfill soil using a sheet-like reinforcing material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rigid wall 2 Spacer 3 Backfill soil 4 Sheet reinforcement

Claims (1)

(57) [Claims] 1. A method for backfilling a rigid wall, wherein backfilling is performed on a back surface of the rigid wall with a reinforcing soil using a sheet-like reinforcing material. After installing the spacer, a backfill of the reinforcing soil is constructed on the back of the spacer, and then the spacer is removed to provide a temporary space between the rigid wall and the backfill, and the rigid body of the backfill is provided. A method for backfilling a rigid wall with reinforced soil, which allows deformation to the wall side.