JP2000319892A - Method for repairing existing sprayed material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the adhesiveness of sprayed mortar to an existing sprayed material (to be repaired) by performing cleaning treatment of a surface of the existing sprayed material, driving a desired number of anchor pins from the surface of the sprayed material to a slope surface, and spraying repairing mortar to the surface of an adhesive film formed on the surface of the sprayed material so as to have a predetermined thickness. SOLUTION: An injection pipe 13 is driven from the surface of a sprayed material 11 to a cavity portion 12, and a predetermined kneaded grout 14 is fed as a filler from the injection pipe 13 to the cavity portion 12. Next, the surface of the existing sprayed material 11 is washed by splashing jet water or the like, and then a suitable number of anchor pins 16 are driven from the surface of the existing sprayed material 11 to a slope surface 15. At this time, a head edge of each anchor pin 16 is protruded from the surface of the existing sprayed material 11. Thereafter, an adhesive film 17 is applied onto the surface of the existing sprayed material 11 in order to impart the adhesiveness (stickiness) thereto. Then, mortar 18 or the repairing spraying material is sprayed on the surface of the existing sprayed material 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a mortar or concrete spray material applied to a slope such as a slope or a steep slope having a risk of collapse.

[0002]

2. Description of the Related Art Slope such as slopes sprayed with mortar or concrete for the purpose of protection, shrinkage and swelling due to infiltration from cracks of sprayed material, flooding and freezing from rock behind, as time passes. In many cases, the spraying material and the bedrock become brittle due to such factors.

If these are left unchecked, they cannot be collected. Therefore, when the above-mentioned factors occur, it has become mainstream to cut down the sprayed material and repeat the slope countermeasure work.

[0004] However, according to this method, the shaving operation is extremely time-consuming, and the cost is greatly increased, and measures for treating industrial waste generated by the shaving operation are also serious.

Conventionally, for the purpose of solving the above-mentioned problems, cracks and cavities 3 are formed in an existing spraying material 2 which needs repair such as mortar or concrete applied to a slope 1 as shown in FIG. When it is found, as shown in FIG. 4, an injection pipe 4 is first driven into the cavity 3 from the surface of the spray material 2, and then, for example, a kneading mortar of cement and sand is injected into the cavity 3 from the injection pipe 4. Material 5 is filled.

[0006] After the surface of the spray material 2 is washed with a jet water stream or the like, an anchor pin 6 is driven in an appropriate arrangement from the spray material 2 toward the slope 1.

At this time, the head end of each anchor pin 6 is
Protruding from the surface. Thereafter, a mortar 7 as a repairing spraying material, which is pressure-fed by a grout pump, is sprayed on the surface of the spraying material 2.

[0008]

According to the above-mentioned existing method for repairing a blasting material, when the repairing mortar is sprayed, the mortar collides with the surface of the blasting material, and the small blasting material rebounds.

[0009] This occurs because the surface of the existing spraying material has no adhesiveness. This results in a significant loss of spray mortar. The above problems are also caused by splashing during spraying. In addition, the bounced small mortar rolls and sometimes stops on the surface of the existing spraying material while rolling.

[0010] The stopped mortar (including mortar with poor adhesion attached by scattering) is buried in the mortar to be sprayed.

Then, there is no strong adhesiveness, and a peeling phenomenon occurs at that portion. Accordingly, an object of the present invention is to improve the adhesiveness of a spray mortar to an existing (repaired) spray material.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention cleans the surface of an existing spraying material which needs repair, and prepares a desired number of spraying materials from the surface of the spraying material on a slope. Then, an adhesive film is provided on the surface of the spray material, and then a repair mortar is sprayed on the surface of the adhesive film so as to have a predetermined thickness.

[0013]

Embodiments of the present invention will be described with reference to the accompanying drawings.

In the embodiment of the present invention, as shown in FIG.
Is found, the injection pipe 13 is driven into the cavity 12 from the surface of the spray material 11.

Thereafter, a kneading injection material 14 of, for example, cement and sand is filled from the injection pipe 13 into the hollow portion 12 as a filling material.

Next, the surface of the existing spraying material 11 is washed with jet water or the like. Thereafter, an appropriate number of anchor pins 16 are driven from the surface of the existing spray material 11 toward the slope 15.

At this time, as shown in FIG.
The head end side of the anchor pin 16 is made to protrude from the surface of 1.
Thereafter, an adhesive film 17 is provided on the surface of the existing spraying material 11 for imparting adhesiveness (adhesiveness).

The adhesive film 17 is provided by spraying a cement paste mixed with an adhesive, for example, a cement obtained by adding water and a calcium carbonate compound as an admixture to a cement and kneading the cement paste. Thus, mortar 18 as a repairing spray material is sprayed on the surface of the existing spray material 11.

In addition, short fibers may be mixed into the repair mortar 18 for reinforcement, and the mortar 18 is blown while being pumped by a grout pump as is well known.

[0020]

As described above, the method for repairing an existing sprayed material according to the present invention is performed as described above. ) To minimize it,
Improve adhesion.

Further, since there is no burial of the repairing mortar which has bounced off and stopped rolling, there is no reduction in strength.

Further, the infiltration of water is prevented by the adhesive film,
It also has the effect of significantly improving durability.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a pretreatment of a method of the present invention.

[Figure 2] Longitudinal side view after construction

FIG. 3 is a longitudinal sectional side view showing a pretreatment of a conventional method.

FIG. 4 is a longitudinal side view after construction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Spraying material 12 Cavity part 13 Injection pipe 14 Injection material 16 Anchor pin 17 Adhesive film 18 Repairing spraying material

Claims (1)

[Claims] 1. A surface of an existing spraying material requiring repair is washed, and a desired number of anchor pins are driven into the slope from the surface of the spraying material, and then an adhesive film is applied to the surface of the spraying material. Repairing mortar is then sprayed on the surface of the adhesive film so as to have a predetermined thickness.