JP2875770B2 - Overlay method by concrete pavement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete pavement overlaying method for enhancing a deteriorated pavement surface and a pavement layer.

[0002]

2. Description of the Related Art In recent years, in a method of repairing a concrete bridge or a method of repairing a runway or the like, an overlay method using steel fiber reinforcement concrete (SFRC) and a slab thickening method have been performed.

In this overlay method, a pavement surface is cut to a predetermined thickness, the cut surface is subjected to surface treatment by shot blasting with a steel ball, and a new pavement surface and a surface layer are formed thereon. I have.

[0004]

SUMMARY OF THE INVENTION
As described above, from the point of laying a new surface layer on the existing pavement surface, the adhesive force between the existing pavement surface and the new surface layer occupies a large weight in terms of life. For this purpose, surface treatment by shot blasting has been performed to increase the adhesion to the existing pavement surface, but it has not been sufficient yet.

Accordingly, an object of the present invention is to provide an overlay construction method using concrete pavement, which is excellent in workability and can extend the life of the repaired pavement surface.

[0006]

In order to achieve the above object, the present invention provides a method for forming an uneven surface on a paved existing surface layer by means of a water jet for jetting high-pressure water. After forming a small uneven surface by shot blasting which sprays small particles on the upper surface, a surface layer of a concrete pavement material having a predetermined thickness is formed on the upper surface.

[0007] According to such an overlay construction method using concrete pavement, the surface layer overlaid is nearly doubled by the surface treatment with the uneven surface and the small uneven surface formed on the surface of the uneven surface. Adhesive force can be obtained, and the life can be extended. Also,
The uneven surface can be formed by the water jet without impairing the strength of the surface layer, and the combination of the water jet and the shot blast allows the surface treatment operation to be completed quickly. Therefore, the overall work time can be shortened.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows each work process, and FIG. 2 shows a sectional view of an existing surface layer 1. Reference numeral 3 denotes a damaged portion such as a crack 5 or unevenness in the existing surface layer 1 which has been paved. 7 shows a first concavo-convex processing step of performing a surface treatment on No. 7; In this embodiment, a water jet 9 is used as an unevenness processing means for performing a surface treatment in the first unevenness processing step 3. The water jet 9 is a power unit vehicle 1 having a water tank.
1 and has a high-pressure water injection nozzle (not shown) for injecting high-pressure water, injects high-pressure water toward the surface layer 1, and sucks the injected water by a vacuum vehicle 13. As shown in FIG. 3, the uneven surface 15 is formed over the entire area. The uneven surface 15 can have a large-diameter uneven surface 15 by increasing the water pressure or increasing the amount of water according to the strength condition and deterioration condition of the existing pavement layer. In particular, in the case of the water jet 9, from the point where high-pressure water is injected,
Cracks 5 and damaged portions 7 which are weak portions of the pavement surface are removed to form a large uneven surface 15 and an aggregate 17.
Since the unevenness is created by avoiding the portion, the advantage that the pavement strength is not weakened can be obtained.

Reference numeral 19 denotes a second concave / convex processing step for forming a smaller concave / convex surface 21 on the surface of the concave / convex surface 15 formed by the water jet 9.

In this embodiment, a shot blast 23 is used as an unevenness processing means used in the second unevenness processing step 19.
Is used. The shot blast 23 uses a shot material such as a grid or a steel ball having a small particle diameter as a material to be hit, and hits the shot material from above the uneven surface 15 to form the uneven surface 15 as shown in FIGS. A small uneven surface 21 is formed on the surface or on the exposed surface of the aggregate 17, and the shot material and the abrasive powder are sucked by suction means (not shown).

Reference numeral 25 denotes a final concrete casting step, in which concrete is poured by a concrete mixer 27 onto the uneven surfaces 15, 21 formed in the second uneven processing step 19, and the surface layer is formed as shown in FIG. 29 are formed.

According to the overlay construction method using concrete pavement, the first unevenness processing steps 3 and 19 form a small uneven surface 21 on the surface of the uneven surface 15. In addition, since the uneven surfaces 15, 21 are formed by the combination of the water jet 9 and the shot blast 23, the unevenness can be formed without weakening the pavement strength, and can be completed easily and quickly, and the overall working time can be shortened. become. In addition, as a result of the formation of the small uneven surface 21 on the surface of the uneven surface 15, almost twice the adhesive strength can be obtained as compared with the related art. FIG. 6 shows the experimental results.

In FIG. Nos. 1, 2, and 3 show that when the surface treatment of the surface layer 9 was performed by only the shot blast method, Nos. 4, 5, and 6 were obtained by the water jet only method. Numerals 7 and 8 show the case where the water jet and the shot blast according to the present invention are combined with each other.

According to FIG. 6, in the case of water jet or shot blasting performed alone, even if the depth of the unevenness is increased, the water jet and shot blast combined with the adhesion strength of about 10 to 15 kg / cm ² can be obtained. . 7,
8 shows that an adhesion strength of 26.8 to 27.1 kg / cm ² can be obtained. This value is about twice as large as the conventional value, and it can be understood that the value is extremely excellent.

[0016] In FIG. Although the values of the adhesion strengths 7 and 8 are reversed, it is considered that the unevenness condition in the vicinity of this is at the limit position of the adhesion strength.

[0017]

As described above, according to the present invention, the surface treatment for forming a smaller uneven surface on the uneven surface is reduced by the combination of water jet and shot blast to reduce the pavement strength. Easy and without
Completes quickly and requires less overall time. In addition, since the adhesive strength of the overlay pavement surface can be significantly increased as compared with the conventional art, the pavement life can be extended.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an overlay construction method using concrete pavement.

FIG. 2 is an explanatory view of a cut surface cut by a cutting machine.

FIG. 3 is an explanatory view in which an uneven surface is formed on a cutting surface by a first unevenness processing means.

FIG. 4 is an explanatory diagram in which a small uneven surface is formed on the surface of the uneven surface by the second unevenness processing means.

FIG. 5 is an explanatory view showing an overlay.

FIG. 6 is an explanatory diagram showing an experimental result of an adhesion strength.

[Description of Signs] 1 Existing surface layer 9 Water jet 15 Uneven surface 21 Uneven surface 23 Shot blast 29 Surface layer by overlay

──────────────────────────────────────────────────続 き Continued on the front page (72) Shoichi Kameda 2-7-1 Nihonbashi Honcho, Chuo-ku, Tokyo Inside the New Tokyo International Airport Corporation (72) Hiromichi Sato 1-6-5 Shimbashi, Minato-ku, Tokyo Within Japan Road Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) E01C 23/00 E01C 23/08

Claims (1)

(57) [Claims] 1. An uneven surface is formed on a paved existing surface layer by a water jet for injecting high-pressure water.
An overlay construction method using a concrete pavement, wherein a small uneven surface is formed by shot blast in which small particles are sprayed on the uneven surface, and a surface layer made of a concrete pavement material having a predetermined thickness is formed on an upper surface thereof.