JP2002275812A - Deflective water permeable concrete pavement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide inexpensive water permeable concrete pavement excellent in durability and water permeability. SOLUTION: A reinforcing frame 11 composed of flexible plastic and a deflective water permeable concrete layer composed of water permeable concrete 5 are arranged on a roadbed. In this case, the reinforcing frame 11 composed of the flexible plastic is formed of a frame vertically penetrating, and partitioned into a plurality of small chambers by a wall having the height exceeding no height of an outer wall of the reinforcing frame 11 composed of the flexible plastic. The deflective water permeable concrete layer is formed by placing the water permeable concrete inside the reinforcing frame 11 composed of the flexible plastic.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible permeable concrete pavement suitable for pavement such as sidewalks, open spaces, parking lots, and roadways used by pedestrians and light vehicles.

[0002]

2. Description of the Related Art Roads and open spaces are facilities used by people and vehicles for safe, quick and comfortable movement regardless of the weather. Conventional pavement emphasizes its durability and watertightness, and concrete and asphalt are densely applied to the surface layer to prevent water from entering the roadbed and subgrade. However, in recent years, urban temperature rises in summer, river floods during rainfall,
The subsidence caused by the depletion of groundwater, etc. has triggered, and contrary to the conventional pavement, the pavement that makes the surface layer porous and allows the rainwater to penetrate the roadbed and subgrade, that is, interest in permeable pavement has increased. . Where there is a concern about collapse of the subgrade due to infiltration water, drainage pavement is being constructed (for example, Water and Pavement Association, well-understood permeable pavement, Sankaido (1997)).

The permeable pavement includes permeable cement concrete pavement (hereinafter simply referred to as permeable concrete pavement) and permeable asphalt pavement. At present, on the sidewalks in urban areas, permeable asphalt pavement is mainly used, which is flexible and easy to walk, and whose construction cost is lower than that of permeable concrete pavement. The advantages of permeable asphalt pavement, as described above,
In particular, there is an advantage that the pavement cost is relatively inexpensive, but on the other hand, there is a problem that the surface layer is easily clogged due to heat softening, and there are problems such as a short life, and if a long life is desired with durability Is suitable for permeable concrete pavement (for example, cement concrete, No. 6).
31, 64 (1999); Cement Newspaper, September 2000
On March 25).

[0004] In the case of permeable concrete pavement, small permeable flat plates and interlocking blocks are conventionally arranged because concrete to be used is a material having high compressive strength but extremely low flexibility and low bending strength. The method has been adopted. However, such pavement, as experienced in various places, due to the change of the roadbed over time,
There may be a problem from the viewpoint of barrier-free, for example, a step is generated between the flat plate and the block. Larger flat plates and blocks can solve these problems considerably,
As described above, realization is difficult because of the low bending strength of concrete.

[0005] On the other hand, even if the roadbed has irregularities, the pavement thickness is increased to such an extent that it can withstand the strength (Sato Road Co., Ltd., Permiacon Pavement Technical Data (199).
6)). Increasing the pavement thickness, for example, to about 80 mm on the sidewalk, and 100 to 200 mm in parking lots and roadways, results in a high-strength and highly durable permeable pavement. At present, it is difficult to adopt it for large-area pavement at present. If the thickness of the pavement is reduced to, for example, about 30 mm in order to reduce the construction cost, as described above, the strength is insufficient as it is, and the pavement cannot withstand running of a light vehicle.

At present, in order to improve the strength of permeable concrete, a method of adding an organic polymer such as polyacrylate, synthetic rubber or the like to concrete in the form of an aqueous emulsion is generally used (for example, JP-B 5-34299; JP-B 7-99002).

[0007]

[Problems to be solved by the invention]
In the methods described in Japanese Patent No. 4299 and Japanese Patent Publication No. 7-99002, the thickness of the permeable concrete pavement cannot be made too small in order to withstand the running of the vehicle.

[0008] Unlike the above method, in order to overcome the disadvantages of the permeable asphalt pavement and the permeable concrete pavement, a permeable resin pavement in which the aggregate is hardened with a hardening resin has also been used. However, this pavement, as is often found on roads in urban areas, etc., cannot express the strength required for pavement alone, and is a decorative finish on the surface,
In the early stage of construction, the finish is good and beautiful, but when the epoxy resin etc. used as a binder is exposed to ultraviolet rays, it easily deteriorates, and the aggregate surface is covered with resin, so it is slippery etc. There are disadvantages.

As described above, the permeable concrete pavement is durable, has a long life, and is desirable in the long term, but has a problem that the initial investment is large. In order to solve this problem and spread the economically advantageous permeable concrete pavement in the long term, it is necessary to realize an unprecedented thin-layer, high-strength permeable concrete pavement. For this reason, development of an inexpensive and simple method for imparting flexibility to a fragile permeable concrete structure having high rigidity is desired.

According to the present invention, in order to solve the above-mentioned problems, it is possible to perform on-site construction or to lay on-site a precast product manufactured in advance at a concrete product factory. Another object of the present invention is to provide an excellent flexible permeable concrete pavement.

[0011]

In order to achieve the object of the present invention, the present invention is configured as described in the appended claims.

That is, in the flexible permeable concrete pavement of the present invention, as described in claim 1, a flexible permeable concrete layer comprising a permeable concrete and a reinforcing frame is provided on a roadbed.

In this case, the reinforcing frame is divided into a plurality of small chambers by a wall penetrating the reinforcing frame vertically and having a height not exceeding the height of the outer wall of the reinforcing frame. A flexible plastic frame, and the flexible water-permeable concrete layer is formed by casting the water-permeable concrete inside the reinforcing frame.

In these cases, the reinforcing frame is installed on a roadbed, and permeable concrete is poured into the reinforcing frame.

In these cases, as described in claim 4, a frame-permeable permeable concrete unit plate in which permeable concrete is cast inside the reinforcing frame is laid on the roadbed.

Further, in these cases, the surface of the permeable concrete is washed out and finished.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An object of the present invention is to provide an inexpensive and highly durable permeable concrete pavement, which is based on rigid permeable concrete and plastic. The purpose is to provide flexibility. This aims to realize a permeable concrete pavement having a thickness of about 25 to 50 mm and which can withstand running of a vehicle.
The thickness varies slightly depending on the thickness of the conventional permeable concrete pavement, for example, the required amount of water retention and the thickness of the roadbed, but the sidewalk / square: 80 mm, parking lot: 100 mm, and the lane on which light vehicles pass: It is extremely thin compared to about 150 to 200 mm.

In general, to increase the flexural strength of concrete, it is sufficient to use reinforced concrete in which a reinforcing bar is inserted. However, in the case of permeable concrete, since acid rain and the like can penetrate freely into the inside, it is necessary to prevent the reinforcing bar from rusting. However, it is difficult even if rust-proof plating is applied. In addition, a method of kneading organic fibers having high tensile strength is also effective for dense concrete, but it is technically difficult for permeable concrete to make full use of the properties of fibers. The present invention is not based on these prior arts, but by wrapping the permeable concrete firmly in a flexible plastic frame, without impairing the rigidity of the permeable concrete,
This is to fully exhibit the flexibility of plastic.

FIGS. 1 to 3 schematically show the flexible permeable concrete pavement of the present invention. FIG. 1 is a schematic sectional view.
That is, a crushed stone having an appropriate particle size, for example, a crusher orn 40 is laid on the subgrade 1 to form a subgrade 2 of about 120 to 200 mm, which is crushed, and a flexible permeable concrete including a permeable concrete and a reinforcing frame is formed thereon. The concrete layer 3 is formed to a thickness of 25 to 50 mm.

FIG. 2 is a schematic plan view of the pavement. In the figure, as shown by the thick line, joints 4 are provided on the flexible permeable concrete layer 3 at intervals corresponding to the size of the reinforcing frame made of the used flexible plastic.

FIG. 3 is an enlarged schematic view of a portion A surrounded by a square in FIG. In the figure, reference numeral 11 denotes a reinforcing frame made of flexible plastic, and reference numeral 5 denotes permeable concrete. As shown in the figure, a reinforcing frame 11 made of a flexible plastic is divided into a plurality of small chambers, and has a structure in which permeable concrete 5 is poured into the small chambers. As described above, by permeable concrete being divided into small chambers surrounded by flexible plastic walls and cast,
Although the rigidity of concrete and the flexibility of plastic complement each other, despite its extremely thin thickness, it has high compressive strength and bending strength, and also has excellent durability. The laid flexible permeable concrete pavement is obtained.

FIGS. 4 and 5 schematically show examples of the reinforcing frame 11 made of flexible plastic. The reinforcing frame 11 made of the flexible plastic has a frame shape,
An outer wall 13 that determines the size and an inner wall 14 or an inner wall 15 that divides the frame into small chambers. The reinforcing frame 11 made of the flexible plastic is made of a flexible plastic frame that penetrates up and down and is divided into a plurality of small chambers by walls having a height not exceeding the height of the outer wall of the reinforcing frame. Has become. FIG. 4 shows a case where the height of the inner wall 14 is equal to the height of the outer wall 13, and FIG. 5 shows a case where the height of the inner wall 15 is lower than the height of the outer wall 13. The permeable concrete is cast so that its surface is aligned with the upper end of the outer wall. The frame shown in FIG. 5 is suitable for a case where the small chamber has a relatively large area or where the upper end of the inner wall is not desired to be exposed to the outside.

In the above example, each of the compartments partitioned in the reinforcing frame made of flexible plastic has a square cross section,
Each of the small chambers has a quadrangular prism shape. However, the shape of the small chamber does not need to be a quadratic prism shape, and may be a cylindrical shape, a hexagonal prism shape, or any other deformed shape as needed.
The shape of the small chamber may be determined in consideration of the shape of the frame, ease of manufacturing, and the like. The size of the compartment, that is, the sectional area of the compartment, is a factor directly related to the strength of the flexible permeable concrete constituting the pavement of the present invention. If the cross-sectional area is too small, it will be difficult to easily and sufficiently tightly lay the permeable concrete into the frame. Conversely, if it is too large, the strength of the flexible permeable concrete is impaired. This strength naturally depends on the thickness of the flexible permeable concrete. Therefore, the limit of the size of the small room is
Depending on the thickness, as the thickness increases, the limit of the size of the cell increases. Further, when determining the size of the small chamber, it is necessary to consider the size of the aggregate. The size of aggregate used for flexible permeable concrete pavement is usually about 5 to 20 mm. As the aggregate becomes larger, it is necessary to increase the area. Area of chamber is suitably about 30～500Cm ^2, but it may also be more than thousand cm ^2. When the small chamber has a prismatic shape, it is also effective to round the corners of the interior according to the size of the aggregate to improve the filling of the permeable concrete. In the actual construction of flexible permeable concrete pavement, the above factors are intricately entangled, so it is necessary to select a reinforcing frame having an appropriate shape and size according to the design specifications.

The upper part of the columnar chamber formed by partitioning the inside of the reinforcing frame appears on the pavement surface, so it is necessary that the upper part be completely open. It may not be necessary at all, or may have a structure for appropriate reinforcement or the like.

Further, if the plastic forming the frame and the permeable concrete are displaced by a small force, the strength of the flexible permeable concrete is significantly impaired. For this reason, it is important to improve the mechanical fitting so that the two do not shift even if there is a difference in the material, and therefore, each of the small chambers has a protrusion not longer than the height of the small chamber. It is also effective to provide the strips at appropriate intervals in the vertical direction. Providing the ridges in the vertical direction is advantageous for both ease of forming the frame and ease of placing permeable concrete.

Even when the flexible permeable concrete is manufactured as a precast product at a concrete product factory, that is, as a framed permeable concrete unit plate, a reinforcing frame made of a flexible plastic is directly installed on the roadbed at the site. Even when permeable concrete is cast, each frame as a laying unit has a structure in which the frames are tightly coupled or fitted to each other.

Now, the present invention will be described in further detail with reference to Examples.

[0028]

Example 1 Example 1 Production and Construction Method of Frame-Containing Permeable Concrete Unit Plate: (1) Production of Reinforcement Frame A 1/1 mixture of polypropylene and polyethylene was melted and extruded. A 600 mm × 600 mm interlocking reinforcing frame composed of 20 hexagonal column-shaped chambers as schematically shown was produced. In the figure,
Reference numeral 12 is a reinforcing frame made of a flexible plastic, and reference numeral 1
Reference numeral 6 denotes a hexagonal column-shaped small chamber. The thickness of the wall of the reinforcing frame made of the above flexible plastic was about 2 mm, and the height was 30 mm. Note that, in the drawings, a structure for fitting the frame with a ridge or a frame provided in the small chamber is omitted. (2) Production of permeable concrete 100 parts by weight of ordinary Portland cement, 50 parts by weight of river sand having a particle size of 1 mm or less, 550 parts by weight of natural stone having a particle size of 7 to 12 mm, 0.4 parts by weight of a melamine-based water reducing agent, 30% SBR emulsion A mixture having a basic composition of 3 parts by weight and 28 parts by weight of water was kneaded well with a mixer. (3) Production of Frame-Containing Permeable Concrete Unit Plate The reinforcing frame made of the above-mentioned flexible plastic was placed on a surface plate, and the above-mentioned permeable concrete was poured into each of the small chambers so as to rise. Next, the permeable concrete was pressed from above using a hand vibrator having a 2.5 mm-thick plate attached to the tip while applying vibration, and the permeable concrete was poured into each small chamber in the frame. After the permeable concrete was completely poured, the sheet was covered with a vinyl sheet and cured at room temperature (about 25 ° C.) for 20 hours. The permeability coefficient of the permeable concrete partitioned into the small chamber is 2.5 × 10 ^{−1 to} 3.8 × 10
It was good within the range of ^-1 cm / s. The pressure resistance after 3 weeks was as good as 4 MPa (400 t / m ² ) or more. (4) Construction A 150mm thick crass sharan 4 on a flat surface.
No. 0 roadbed was made, and the frame-permeable permeable concrete unit slabs prepared in (3) were laid in three rows of 10 in each row, and a flexible permeable concrete pavement was constructed.
The connection of the frame-permeable permeable concrete unit plates to each other was performed by a method in which a protrusion and a recess formed in advance so as to be fitted to the reinforcing frame were engaged with each other. The above-mentioned pavement was sufficiently resistant to running of pedestrians, bicycles, passenger cars and the like.

[Example 2] On-site construction of flexible permeable concrete pavement: A 150 mm thick crusher run 40 roadbed is formed on a flat and leveled ground, and is shown in Example 1- (1). 30mm thick 60
3 × 1 reinforcement frame made of flexible plastic of mm × 60mm
0 pieces were fixed to each other with bolts.

The permeable concrete shown in Example 1- (2) is put into the above-mentioned reinforcing frame made of flexible plastic, compacted with a compactor, and the reinforcing frame made of the permeable concrete surface and the above-mentioned flexible plastic is compacted. Finished so that the upper ends are aligned. Then, a vinyl sheet was hung on this and cured for 2 days.

The pavement had good water permeability. In addition, a permeable pavement that can withstand pedestrians, bicycles, passenger cars and the like was obtained.

Example 3 Manufacturing method of permeable concrete unit plate with washout frame: In the same manner as in Examples 1- (1) and (2), a reinforcing frame made of flexible plastic and permeable concrete were produced. did. A reinforcing frame made of a flexible plastic was placed on a surface plate, and the permeable concrete was filled in the reinforcing frame made of the flexible plastic in the same manner as in Example 1- (3). Next, the non-woven fabric impregnated with the setting retarder was placed on the concrete, adhered well, covered with a vinyl sheet, and cured at room temperature (25 ° C.) for 20 hours.
After curing, the vinyl sheet and the nonwoven fabric were removed, and the uncured mortar on the surface was washed away with water. As a result, a water-permeable concrete unit plate with a washout frame having excellent surface cosmetic properties and excellent water permeability and strength was obtained.

[0033]

As described above, in the flexible permeable concrete pavement of the present invention, since the flexible permeable concrete layer comprising the permeable concrete and the reinforcing frame is provided on the roadbed, the durability and the durability are improved. A water-permeable pavement excellent in water permeability can be constructed at low cost.

Further, in the flexible permeable concrete pavement of the present invention, the reinforcing frame is divided into a plurality of small chambers by walls that penetrate vertically and that do not exceed the height of the outer wall of the reinforcing frame. Since the flexible water-permeable concrete layer is formed by placing the water-permeable concrete into the inside of the reinforcing frame, the water-permeable concrete layer has an unprecedented thin thickness and high strength. It has become possible to form a permeable concrete layer, thereby making it possible to construct a water-permeable pavement excellent in durability and water permeability at low cost.

In addition, the flexible permeable concrete pavement of the present invention has the above-described reinforcing frame installed on a roadbed, and permeable concrete is poured into the inside of the reinforcing frame. It can be carried out. Further, the water permeability of the pavement is good, and the pavement has strength enough to withstand running of pedestrians, bicycles, passenger cars and the like.

Further, the flexible permeable concrete pavement of the present invention is excellent in that the frame-provided permeable concrete unit slab in which the permeable concrete is cast inside the reinforcing frame is laid on the roadbed. With high water permeability and strength,
Excellent workability on site.

In addition, the flexible permeable concrete pavement of the present invention has excellent surface cosmetic properties and excellent water permeability and strength because the surface of the permeable concrete is washed out.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a flexible permeable concrete pavement according to the present invention.

FIG. 2 is a schematic plan view of a flexible permeable concrete pavement according to the present invention.

FIG. 3 is a partially enlarged view of the schematic plan view shown in FIG. 2;

FIG. 4 is a reinforcing frame made of a flexible plastic according to the present invention.

FIG. 5 is a reinforcing frame made of another flexible plastic according to the present invention.

FIG. 6 is a reinforcing frame made of the flexible plastic shown in the first embodiment.

[Explanation of symbols]

1: subgrade, 2: subgrade, 3: flexible permeable concrete layer,
4: joint, 5: permeable concrete, 11: reinforcing frame made of flexible plastic, 12: reinforcing frame made of flexible plastic, 13: outer wall, 14: inner wall, 15: inner wall,
16: Komuro

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D051 AA02 AB03 AF01 AF03 AG03 AG15 AH01 AH02 DA02 DA16 DB01 DC09 EA02 EA03 EA06 EB05

Claims (5)

[Claims] 1. A flexible permeable concrete pavement comprising a flexible permeable concrete layer comprising a permeable concrete and a reinforcing frame provided on a roadbed. 2. The reinforcing frame comprises a flexible plastic frame which is vertically divided and divided into a plurality of small chambers by a wall having a height not exceeding a height of an outer wall of the reinforcing frame. The flexible water-permeable concrete pavement according to claim 1, wherein the flexible water-permeable concrete layer is formed by placing the water-permeable concrete inside the reinforcing frame. 3. The flexible water permeable member according to claim 1, wherein said reinforcing frame is installed on a roadbed, and permeable concrete is poured into said reinforcing frame. Concrete pavement. 4. A permeable concrete unit plate with a frame formed by permeable concrete laid inside the reinforcing frame is laid on a roadbed. A flexible permeable concrete pavement as described. 5. The surface of the permeable concrete is washed out and finished.
A flexible permeable concrete pavement according to any one of the above.