JPH03290502A - Asphalt pavement road having drainage function - Google Patents

Abstract

PURPOSE:To enable the quick drainage of rain water from the surface of a road by arranging longitudinal and transverse water permeable areas at the zone of the road most frequently subjected to the wheel load of a traffic vehicle, and at the predetermined zone in a direction intersecting the advance direction of the vehicle. CONSTITUTION:The grooves of the predetermined size are provided on the surface of an asphalt paved road most frequently subjected to the wheel load of a traffic vehicle, and filled with a permeable material, thereby forming longitudinal water permeable zones 3 and 3. A transverse water permeable zone 5 is similarly formed at the predetermined area of the road in a direction intersecting the advance direction of the traffic vehicle. According to the aforesaid construction, rain water on the surface of the road is quickly drained through the longitudinal and transverse permeable zones 3, 3 and 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an asphalt pavement structure having a drainage function and having a water permeable zone disposed at a location where a wheel load is applied to the asphalt pavement.

[Prior Art] In asphalt pavements, rutting, which occurs especially when the road surface temperature is high, has become a major problem due to the intensive loading of passing vehicles. This is because rainwater collects in the depressions created by this rutting phenomenon during rain, causing hydroplaning, visibility obstruction due to water splashing, and smoking phenomena, which impair the safe and comfortable driving of vehicles. .

The reality is that these ruts on heavy traffic roads and intersections must be repaired once every few years. As a countermeasure to this problem, research is being carried out to improve the materials used and to improve the pavement structure.

- An example is asphalt pavement using modified asphalt. However, it is very costly to use such modified asphalt throughout the entire layer of the asphalt mixture, and when it is used only in the surface layer,
There are drawbacks such as ineffectiveness in areas where layers below the base layer are deformed.

(Problem to be solved by the invention) In order to eliminate the above-mentioned disadvantages, one solution is to improve the materials used as described above, increase the strength of asphalt pavement, and take measures to prevent rutting from occurring. Basically, rutting is a problem that is difficult to avoid, and since rainwater flows along the asphalt pavement surface, water tends to accumulate in the depressions caused by the rutting phenomenon, and drainage treatment is difficult. Unless this is done, the above-mentioned disadvantages will be unavoidable.

Therefore, an object of the present invention is to reduce the above-mentioned disadvantages by configuring an asphalt pavement slab so that rainwater does not accumulate in the depressions and drains quickly.

[Means to solve the problem]

In the present invention, the above-mentioned problem is solved by disposing a permeable zone in an area that most frequently receives the wheel load of traffic vehicles during asphalt pavement, and in a predetermined area in a direction intersecting the direction of travel of traffic vehicles. .

permeability zone in the area most frequently subjected to wheel loads of traffic vehicles (
The vertical permeability zone (hereinafter referred to as the "vertical permeability zone") is formed by multiple lines along the direction of travel of traffic vehicles, and the number of such bands varies depending on how wide the vertical permeability zone is determined and its relationship with the width of the line. However, there are usually 2 to 4 pieces. Therefore, the width of the streak is
Although it is related to the number of stripes and the width of the longitudinal permeable zone, it is generally about 3 to 50 c-.

In addition, a permeable zone in a direction intersecting the direction of travel of traffic vehicles (hereinafter referred to as a "lateral permeable zone") is provided to drain rainwater that has permeated into the vertical permeable zone to the side ditch. and are spaced apart from each other at regular intervals. This interval is basically determined in relation to the permissible amount of rainwater flowing through the vertical permeable zone and the width of the horizontal permeable zone, but may be any interval.

The depth or thickness of the permeable zone is determined from the surface side of the asphalt mixture layer to the middle of the mixture layer, and is approximately 5.
~15cm.

Incidentally, since rainwater permeating through the vertical permeable zone is discharged to the side grooves via the horizontal permeable zone, it is preferable that the bottom of the permeable structure of the vertical permeable zone slopes toward the horizontal permeable zone.

As the material for the permeable structure forming the permeable zone, in addition to permeable cement concrete having a composition disclosed in JP-A-59-206502, permeable asphalt concrete, permeable precast products, and the like are used.

If necessary, a perforated pipe may be inserted into the bottom of the water permeable structure of the water permeable zone.

〔Effect of the invention〕

In asphalt pavements where depressions due to rutting have already occurred in the asphalt mixture layer, grooves of a predetermined size are dug in the depressions using a cutter or the like, and then the water-permeable material is filled to form a water-permeable zone.

When a new asphalt mixture is to be laid, a water-permeable structure made of the water-permeable material is placed in a predetermined area to complete the asphalt pavement.

By doing this, rainwater that conventionally stagnated in depressions can be quickly drained through the permeable zone, increasing the coefficient of sliding friction during rain, and reducing visibility due to hydroplaning and water splashing. , smoking phenomenon, etc. can be eliminated. Additionally, since the permeable zone has a higher porosity than other areas, tire noise from passing vehicles can also be reduced. Furthermore, since the tire passes through the water permeable zone, the voids necessary to ensure the water permeable function are cleaned, and the progress of clogging is slowed down, compared to a case where this is not the case.

In addition, by adjusting the mixing ratio of the materials used to form a permeable zone that is more rigid than the asphalt mixture layer, it is possible to prevent rutting in asphalt pavements in areas most frequently subjected to wheel loads from traffic vehicles. It will also constitute a reinforcement zone.

〔Example〕

FIG. 1 shows the state before the portion corresponding to the water permeable zone is filled with a water permeable material.

For existing asphalt pavement, by digging grooves of specified dimensions with a cutter etc. in the areas most frequently subject to the wheel loads of traffic vehicles and any locations that intersect with the road.
The state shown in FIG. 1 is formed.

In addition, when paving a new asphalt mixture, if the surrounding asphalt pavement section 2 is first paved on top of the roadbed 1, the state shown in Figure 1 will be obtained, but also the permeable zone should be installed first and then the surrounding asphalt A paved portion may also be formed.

FIG. 2 shows the state in which the water-permeable material is filled into the water-permeable zone and the device is ready for use. If necessary, a perforated pipe may be inserted at the bottom of the water-permeable structure.

FIG. 3 is a plan view of the installed state of the asphalt pavement structure of the present invention. As described above, the interval and width of the horizontal permeable zone 5 are basically determined in relation to the permissible amount of rainwater flowing through the vertical permeable zone 3, but may be arbitrary. Practically speaking, it is preferable to install it at a location where the vertical slope of the road is low or near drainage equipment such as a water collection basin 6 or a drainage ditch.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the 7-sphalt pavement before filling the permeable zone, FIG. 2 is a cross-sectional view of the asphalt pavement of the present invention during use, and FIG. 3 is a plan view of the asphalt pavement of the present invention. 1... Roadbed 2... Surrounding asphalt pavement portion 3... Vertical water permeable zone 4... Tires of running vehicle 5... Horizontal water permeable zone 6... Water collection basin

Claims (1)

[Claims] An asphalt pavement structure comprising permeable zones arranged in areas that most frequently receive the wheel loads of traffic vehicles and in predetermined areas in a direction intersecting the direction of travel of traffic vehicles.