JP2799632B2 - Paving method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention mainly relates to a pavement method for a pavement road or the like in a cold snowy area.

(Prior Art) Asphalt pavement is generally classified into asphalt pavement and concrete pavement. In general, asphalt pavement is provided with a subbase on a subgrade, and a surface layer made of an asphalt mixture is provided on the subbase through a base layer. Forming and concrete pavement is provided with a subgrade on a subgrade, on which a cement concrete slab is formed. And, in any pavement, in the construction of the surface layer including the road surface, after laying the pavement material, so that the road surface is flat and slippery, and so as not to generate deformation, cracks, etc. due to wear and flow,
The pavement surface is created by vibrating or rolling and compacting until a predetermined reference density is reached.

As the asphalt mixture, a mixture of an aggregate such as crushed stone and sand and a binder or filler such as asphalt is usually used. As the concrete pavement material forming the surface layer of the concrete pavement, a mixture of an aggregate, cement, water and, if necessary, an admixture material such as an AE agent, a water reducing agent, a promoter or a retarder is used. ing. In general, the road surface has a rough surface structure in which the vehicle is easy to travel even when the road surface is flat, and the tire is less likely to slip.

(Problems to be Solved by the Invention) By the way, in a cold snowy area, snow is often accumulated on the road surface or the road surface freezes, and in such a case, the braking distance of the vehicle becomes long, and side slipping easily occurs. For this reason, vehicles traveling on snowy or frozen roads are usually equipped with tire chains and spiked tires. However, when vehicles equipped with chains and spiked tires travel, there is a problem that the road surface is significantly worn. Not only peeling of the white line displayed on the road surface, but also large rutted digging on the road surface due to abrasion, hinders the running of the vehicle, and generates dust, causing a pollution problem.

In order to prevent road surface wear due to spiked tires and chains, in asphalt pavement, as a mixture of asphalt, fine-grained asphalt concrete, fine-grained asphalt concrete, fine-gap gap asphalt concrete, dense-gap gap asphalt concrete, goose asphalt, rolled asphalt Etc. may be used. However, the pavement using these asphalt mixtures has a limited abrasion resistance and does not have a sufficient abrasion resistance effect.

Further, in asphalt pavement, one using a modified asphalt containing rubber is also known. However, the modified asphalt containing rubber focuses on the increase in toughness, tenacity and the like, and the rubber is used in a liquid or gel state, and does not improve abrasion resistance.

The present invention has been made in view of the above circumstances, and an object thereof is to achieve excellent abrasion resistance in asphalt pavement and concrete pavement, and wear of a road surface even by traveling of a vehicle equipped with a chain or a spike tire. It is an object of the present invention to provide a pavement method which can reduce the repair cost significantly.

[Configuration of the invention]

(Means and Actions for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a surface layer portion of a pavement to be paved on a roadbed with 1% of the total amount of pavement material.
A pavement method characterized in that a fluid asphalt pavement material or a concrete pavement material mixed with about 30% by weight of rubber chips is laid without applying rolling pressure, and the rubber chips are scattered in an exposed state on the road surface. .

In the present invention, since the rolling and compaction are not performed during the hardening process of the pavement material, particularly the binder, the rubber chips mixed in the pavement material expand and contract to reduce the density of the binder or deteriorate the pavement strength. There is no rubber chip and the rubber chip is exposed on the road surface, so that the rubber chip serves as a cushioning material for a chain or a pin of a spiked tire.

As the rubber chip used in the present invention, for example, a waste tire, a burr generated at the time of forming the tire, or the like can be used. Its size is preferably about 0.5 to 2.0 mm in diameter, more preferably about 1 mm ± 0.2 mm in diameter, and about 1 to 20 mm in length, and more preferably about 5 to 10 mm. It is 1 to 30% by weight, preferably 2 to 20% by weight, more preferably 4 to 10% by weight. If the size of the rubber chip is too small, the effect of wear resistance does not occur, and if it is too large, the pavement strength deteriorates. Further, if the compounding amount of the rubber chip is too small, sufficient abrasion resistance does not occur, and if the compounding amount is too large, the pavement strength is reduced.

As the heated asphalt pavement material or concrete pavement material of the present invention, known materials other than rubber chips can be used. For example, in the case of asphalt pavement material, aggregate, asphalt, asphalt emulsion, filler, and the like can be used according to predetermined specifications. However, in the present invention, since rolling and compaction are not performed during the curing process, it is preferable to use a pavement material having fluidity.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an asphalt pavement method according to a first embodiment, where 1 is a roadbed. On this subgrade 1, a roadbed 3, a base layer 4, and a surface layer as a surface layer 5 are provided as a pavement 2, and the upper surface of the surface layer 5 constitutes a road surface 6. The subbase 3 and the base layer 4 are constructed by a known construction method. The subbase 3 plays a role of distributing the traffic load propagated from the surface layer 5 and transmitting the traffic load to the subgrade 1, and the base layer 4 is formed of the surface layer. 5 is to uniformly transmit the load to the roadbed 3.

The surface layer 5 is 39% by weight of crushed stone heated to 240 to 270 ° C.
23% by weight of sand and filler 24 heated to 80-150 ° C
6% by weight of straight asphalt having a penetration of 20 to 40 heated to 200 ° C, and 2% by weight of purified trinid asphalt heated to 180 ° C as a fluidizing material,
6% by weight of a rubber chip 7 having a diameter of 1 mm and a length of about 8 mm obtained by crushing waste tires and burrs generated during tire molding is added to the fluid mixture, and the mixture is heated to a kneading temperature of about 200 ° C. The asphalt pavement material obtained by kneading is laid and paved. That is, the surface layer portion 5 lays the asphalt pavement material obtained as described above on an upper layer of the base layer 4 by applying an asphalt finisher to the upper layer of the base layer 4 without applying rolling pressure to a predetermined thickness. Are scattered in such a manner that the outer surfaces of the rubber chips 7 are exposed. The rubber chips 7... Are almost uniformly mixed in the surface layer 5, and the rubber chips 7.
.. Are exposed on the road surface 6.

The asphalt pavement surface thus constructed can absorb and reduce the impact force of the chain with the rubber chips 7... Even in a snowy cold region even when a vehicle equipped with a chain or a spike tire runs. The rubber chips 7 also absorb the cutting force of the spike tire pins. As a result, wear on the pavement surface can be reduced.

In the first embodiment, the mixing amount of the rubber chips was 6% by weight with respect to the total amount of the pavement material. However, if the mixing amount was in the range of 1 to 30% by weight, particularly 2 to 20% by weight, the strength was reduced. The effect of abrasion resistance can be sufficiently exhibited without damaging it.

Further, in the first embodiment, only the surface layer is paved by the pavement method of the present invention. However, the pavement thickness by the pavement method of the present invention can be appropriately adjusted according to specific road conditions, traffic volume and the like. The pavement method of the present invention can be limited to the upper layer portion of the surface layer, or can be used not only for the surface layer but also for all or a part of the base layer.

FIG. 2 shows a concrete pavement method according to a second embodiment, in which 8 is a roadbed. On this subgrade 8 is a pavement 9
A roadbed 10 and a concrete slab as a surface portion 11 are provided, and the upper surface of the concrete slab constitutes a road surface 12. The roadbed 10 is constructed by a known construction method, and plays a role of dispersing the traffic load propagated from the surface layer portion 11 and transmitting the traffic load to the roadbed 8 as in the first embodiment. .

The surface layer portion 11 is a concrete obtained by adding a rubber chip 13 having a diameter of 1 mm and a length of about 8 mm obtained by crushing waste tires and burrs generated during tire molding to a pavement material made of cement concrete by 8% by weight based on the total amount of the pavement material. It is a pavement material, and the rubber chips 13 are laid in an exposed state on the road surface 12 without applying a compaction to a predetermined thickness on the upper layer of the roadbed 10. In other words, the rubber chip 13
Are almost uniformly mixed, and the outer surfaces of the rubber chips 13... Located on the uppermost layer thereof are exposed on the road surface 12.

The concrete pavement surface thus constructed, like the asphalt pavement surface, in a cold snowy region, even when a vehicle equipped with a chain or a spike tire runs, the rubber chips 13 ... The rubber chips 13 can also absorb and reduce the cutting force of the spike tire pins. As a result, the wear of the pavement surface can be reduced.

In the first and second embodiments, pavement of a road is described. However, the present invention can be applied to pavement of a place where a vehicle runs, such as a sidewalk, a parking lot, and a runway.

〔The invention's effect〕

As described above, according to the present invention, 1 to 30 parts of the total amount of the pavement material are added to the surface layer of the pavement to be paved on the subgrade.
A fluid asphalt pavement material or a concrete pavement material mixed with rubber chips of weight% is laid without applying rolling pressure, and the rubber chips are scattered in an exposed state on the road surface, so that the rubber chips are chained or spiked tires. It functions as a cushioning material for the pins, and the wear on the pavement surface is small, so that the repair cost can be greatly reduced and the dust is hardly scattered. In the early stage of snowfall and the early stage of icing, the exposed rubber chips shrink due to the running of the vehicle, which prevents snow and ice from adhering to the road surface, and is suitable for pavement of roads in cold snowy regions.

Further, since the irregular reflection on the road surface is reduced by the rubber chips at the time of rainfall, the safety of running the vehicle can be improved and the traffic accidents can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a road showing a first embodiment of the present invention,
FIG. 2 is a sectional view of a road showing a second embodiment of the present invention. 1,8… subgrade, 2,9… paved body 5,11… surface layer, 6,12… road surface 7,13… rubber chip

────────────────────────────────────────────────── (5) References JP-A-55-55706 (JP, A) JP-A-61-95101 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E01C 7/26 E01C 7/35

Claims (1)

(57) [Claims] 1. A method of compacting a hot asphalt pavement material or a concrete pavement material having fluidity in which 1 to 30% by weight of rubber chips with respect to the total amount of the pavement material is mixed into a surface layer of a pavement to be paved on a roadbed. A pavement method characterized by laying without adding, and laying with rubber chips scattered in an exposed state on a road surface.