JPH09143912A - Paving structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a maintenance-free paving structure excellent in the abrasion resistance for repetitive runs of heavy vehicle or the like. SOLUTION: A paving structure 1 provided with 3 layer structure consists of a road bed as underlayer 2, a concrete layer 3 as intermediate, and the uppermost layer 4 mostly containing resin with excellent abrasion resistance, coarse aggregate, cement, and admixture. The resin layer is constructed thin for the purpose of widening of the inexpensive application, and the strength which may be insufficient therefore is secured by equipping the oversurface of the concrete layer with surface unevenness 3a and providing a primer layer so that the resin layer is integrated with the concrete layer. A mild steel bar coupling part 6 is formed in mild steel reinforcing bars 5 in the concrete layer, and joints as major cause of pavement deterioration can be nullified by distributing the stress due to expansion and contraction over the whole paving surface so that micro-cracking is induced. Thereby a maintenance-free pavement can be established.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pavement structure which is excellent in abrasion resistance against repeated running of a heavy vehicle and which can eliminate joints which are main causes of deterioration of pavement. It is particularly suitable as a paving structure.

[0002]

2. Description of the Related Art Conventional pavement construction methods are roughly classified into asphalt pavement and concrete pavement, but the former construction method is generally used for heavy-duty vehicles in which the heavy-duty vehicle is repeatedly driven because consolidation and wear are likely to progress. It is used for. However, even in this concrete pavement, wear occurs when the heavy vehicle runs at the same position.

In addition, hardening shrinkage of concrete during construction,
Joints installed to prevent cracks and cracks on the pavement surface caused by expansion due to heat and running, warpage, etc., may cause chips and cracks due to frequent running of the vehicle, which may interfere with running of the vehicle. Not only will it cause problems, but also problems will occur in strength, and conventional repair methods have not been improved.

[0004]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to solve the above-mentioned problems of the conventional pavement construction method, such as a heavy load vehicle such as a factory warehouse floor (for example, an idle load). It is an object of the present invention to provide a maintenance-free pavement structure by eliminating joints, which are the main cause of pavement deterioration, and which have excellent wear resistance for pavement in which vehicles (20 tons or more) travel at the same position.

[0005]

As a result of repeated studies to improve the above-mentioned problems of pavement, the present inventor has found a pavement structure that is extremely abrasion resistant and can realize maintenance-free. Completed the invention. That is, the first means has a three-layer structure in which a lower layer is a roadbed, an intermediate layer is a concrete layer, and an uppermost layer is a layer mainly composed of resin, coarse aggregate, cement and admixture, and the reinforcing bars in the concrete layer are The pavement structure is characterized in that a reinforcing bar connecting portion is formed on the. A second means is a pavement structure characterized by forming irregularities on the surface of the concrete layer. The third means is a pavement structure characterized by having a primer layer on the surface of the concrete layer. In the conventional pavement condition survey, the surface of the concrete slab was scraped off by solid tires etc. on the pavement surface.
This pavement involves resin mortar that uses resin, but the resin used is expensive, and due to restrictions on pot life and special equipment required for construction, etc. It is only used to some extent. However, it is a known fact that resins are materials that surely improve abrasion resistance. In addition, it was found from the survey results that most of the causes of pavement repair were due to cracks from joints and the progress of cracks.

The structure of the pavement structure according to the present invention is composed of three layers and eliminates the problems of the prior art. 3
The uppermost layer that constitutes the layer is a resin layer to improve abrasion resistance, but in order to reduce the amount of resin used and to reduce the specifications in order to reduce the cost and expand the range of application, it is a thin layer and within the layer. It is a mixture of coarse aggregate, cement and admixture. The middle layer is constructed of concrete and reinforcing bars to ensure pavement strength and rigidity, and joints, which are the main cause of deterioration, are eliminated along with the top layer. When this joint is abolished, stress due to expansion and contraction is distributed to the entire pavement by connecting reinforcing bars, and microcracks that do not pose a structural problem are induced to prevent the occurrence of cracks or cracks. Further, in order to bear a heavy load, it is an important point to integrate the uppermost thin layer with the intermediate layer. On the other hand, in order to secure the adhesive force between these layers, the intermediate layer is provided with unevenness so as to have a large adhesive surface and a primer layer is provided between the layers to further improve the adhesive force. The top layer is a roadbed for supporting pavement on the ground.

The reinforcing bar connecting portion of the present invention is one in which reinforcing bars are connected to each other by binding wires (wires etc.) or grippers.
Normal construction method is acceptable. However, it is desirable to secure an appropriate connection length in accordance with the Building Standards Act so that stress can be transmitted. Normally, the pavement has an extension distance of tens of meters to tens of meters.
In most cases, the length is as long as 00 m, but as a reinforcing bar material, the length per wire is about 10 m due to restrictions on its manufacturing method, transportation method, and the like. For this reason, in order for the reinforcing bars to transmit stress, it is necessary to connect the reinforcing bars as described above, and the reinforcing bar connecting portion is provided in the intermediate layer of the present invention without leaving unconnected portions. It is preferable that the reinforcing bar connecting portions are distributed almost evenly and scattered. The rebar used may be one normally used. Further, a single reinforcing bar (single reinforcing bar in the concrete layer) or a double reinforcing bar (double reinforcing bar in the concrete layer) may be appropriately selected according to the applied load. A concrete layer is formed by covering the reinforcing bar provided with the reinforcing bar connecting portion. The stress applied to the pavement surface and the intermediate layer is frequent in many places, and the stress direction changes remarkably at the running direction changing part, so the spacing between the reinforcing bar connection parts should be made close to enhance the stress transmission and dispersion effect. It is preferable from the viewpoint of improving the durability of the pavement structure. For improving the durability of the pavement structure, it does not depart from the present invention even if the reinforcing-bar connecting portions in the concrete layer are made dense in a range corresponding to a traveling intersection, a traveling corner, or the like.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Table 1 shows a comparison between the pavement structure according to the present invention shown in FIG. 1 and the conventional pavement shown in FIG. FIG. 1 shows a pavement structure 1 of the present invention. The pavement structure 1 comprises a lower layer 2 which is a roadbed, an intermediate layer 3 which is a concrete layer, and a layer 4 which is mainly composed of resin, coarse aggregate, cement and an admixture. FIG. 1 (a) shows the case where the concrete layer (intermediate layer 3) surface has irregularities 3a and a primer layer, and FIG. 1 (b) shows the case where the concrete layer (intermediate layer 3) surface has irregularities and no primer layer. Show. Figure 1 (a), Figure 1 (b)
In, the reinforcing bar 5 forms a reinforcing bar connecting portion 6 by a wire binding wire. Here, the thickness of each layer is 200 mm for the lower layer, 150 mm for the intermediate layer, and 25 mm for the uppermost layer. The uppermost layer was mainly composed of resin, coarse aggregate, cement and admixture. FIG. 2 shows a conventional pavement structure 7. The pavement structure 7 of FIG. 2 (a) comprises a roadbed 8, a concrete layer 9, and a layer 10 mainly composed of resin, coarse aggregate, cement and admixture. The reinforcing bar 5 in 9 does not have a reinforcing bar connecting portion. Also, joint 1
1 is provided. Here, the roadbed 8 is 200 mm, the concrete layer 9 is 150 mm, and the layer 10 mainly composed of resin, coarse aggregate, cement and admixture is 25 mm. However, FIG.
The pavement structure 7 in (b) does not have the layer 10 in FIG. 2 (a), the roadbed 8 is 200 mm, and the concrete layer is 175 mm.
It is. According to Table 1, although the conventional ones have been improved in specifications of abrasion resistance and strength, they are lacking in the fundamental idea of eliminating joints, which are the main causes of deterioration of pavement. According to the structure invented by paying attention to this point, not only wear resistance and strength but also maintenance-free long life can be realized.

[0009]

[Table 1]

Note 1) In Table 1, the definition of the code of each evaluation item is as follows: Heavy vehicle (vehicle with an empty load of 20 t or more)
(1) Abrasion resistance ○ No wear △ Wear progresses after repeated for a long time, which affects running × Wear progresses even after repeated short periods, which affects running (2) Strength ○ Pavement surface soundness △ Cracks and cracks are generated on the pavement surface, but there is no effect on running. × Cracks or cracks are generated on the pavement surface, which affects running. (3) Service life ○ Free maintenance of 5 years or more △ Repair is required within 5 years × 2 Needs repair within 3 years (4) Comprehensive evaluation ○ Pavement structure that is most suitable for repeated running of heavy vehicles △ Applicable to repeated running of heavy vehicles but requires maintenance × Not suitable for repeated running of heavy vehicles

[0011]

According to the present invention, it is desired to realize a maintenance-free pavement which is hardly worn or deteriorated due to repeated running of a heavy vehicle without installing joints, which are main factors of pavement deterioration, and labor saving is desired. It contributes greatly to a wide variety of industries including the construction industry.

[Brief description of the drawings]

FIG. 1 is a diagram showing a form of a pavement structure of the present invention.

FIG. 2 is a diagram showing a form of a conventional pavement structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pavement structure 2 Lower layer 3 Intermediate layer 3a Roughness 4 Layer mainly composed of resin, coarse aggregate, cement and admixture 5 Reinforcing bar 6 Reinforcing bar connection section 7 Pavement structure 8 Roadbed 9 Concrete layer 10 Resin, coarse aggregate, cement and admixture Layer mainly composed of wood 11 joints

Claims (3)

[Claims] 1. A three-layer structure in which a lower layer is a roadbed, an intermediate layer is a concrete layer, and an uppermost layer is a layer mainly composed of resin, coarse aggregate, cement, and an admixture, and a reinforcing bar is connected to a reinforcing bar in the concrete layer. A pavement structure characterized by the formation of sections. 2. The pavement structure according to claim 1, wherein unevenness is formed on the surface of the concrete layer according to claim 1. 3. The pavement structure according to claim 1 or 2, wherein a primer layer is provided on the surface of the concrete layer according to claim 1 or 2.