JP3209717B2 - Pavement road surface construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pavement road construction method having water permeability and / or water retention, and more particularly, to a pavement construction method applicable to asphalt pavement, brick / stone / plate resin pavement, and other general pavements. About.

[0002]

2. Description of the Related Art In order to infiltrate and retain rainwater into the ground, pavement surfaces such as sidewalks and parks have a water-permeable structure. As a water-permeable structure, it is known to use a water-permeable block in addition to casting a pavement surface with water-permeable concrete. In a structure using a permeable block, the road surface is excavated to a certain depth to form a subgrade,
Gravel or crushed stones are drawn on a flat roadbed to form a subbase layer, and a sand layer is placed on top of the subbase layer to form a sand cushion. (Arrangement).

[0003] In order to prevent the sand of the sand layer from sinking or penetrating into the roadbed layer and causing the road surface to become uneven, a water-permeable fiber membrane or the like is disposed between the sand layer and the roadbed layer. (See, for example, Japanese Utility Model Laid-Open No. 2-47205).

Japanese Patent Application Laid-Open No. 5-51908 discloses a structure in which a water-permeable sheet is laid on a sand cushion made of a sand layer and ordinary paving blocks are arranged.

[0005]

Conventionally, the sand cushion on the lower surface of the water-permeable block, which is arranged so that the upper surface of the arranged water-permeable blocks can maintain the flatness, is formed of sand. The permeable blocks are arranged at regular intervals, and the voids are filled with sand or the like as joints. In such a conventional structure, the sand of the sand cushion sinks or penetrates into the lower layer, and the joint sand may be lost, resulting in disordered arrangement of the permeable blocks and unevenness. Even the destruction of the sex block may occur. In order to prevent such a situation from occurring, a water permeable sheet is laid on the lower surface of the sand cushion (see Japanese Utility Model Application Laid-Open No. 62-126).
No. 03) is not yet a fundamental solution.

Further, in the structure using the conventional sand cushion, the sand cushion solidifies with the lye of the cement for a long period of time, or becomes clogged with mud or dust, so that the cushion functions as a cushion. In some cases, the situation cannot be fulfilled.

SUMMARY OF THE INVENTION In view of the above, the present invention provides a water-permeable material having a structure that can be effectively replaced with a conventional sand cushion without sinking or penetrating into the lower layer and effectively preventing the occurrence of joint sand loss. The purpose is to clarify a pavement road surface construction method having water retention.

[0008]

The above objects of the present invention are as follows. Excavating the road surface to a certain depth to form a subgrade, laying gravel or crushed stone on a flat subgrade to form a subgrade layer, further arranging a sand layer above the subgrade layer to form a sand cushion, In a pavement road surface construction method of arranging a permeable block thereon, or permeable asphalt pavement or permeable brick / stone / flat resin-based pavement, a sand cushion, which is the sand layer, is defined in accordance with JIS standards.
Pavement road surface construction method characterized by forming a single-grained crushed stone layer having a thickness of 20 mm to 100 mm by performing a compaction step by a machine after laying the single-grained crushed stone of No.

[0009] 2. Excavating the road surface to a certain depth to form a subgrade, laying gravel or crushed stone on a flat subgrade to form a subgrade layer, further arranging a sand layer above the subgrade layer to form a sand cushion, After laying a permeable sheet for preventing joint spillage on top, arranging permeable blocks and joint sand, or replacing the sand cushion, which is the sand layer, in the pavement road surface construction method of arranging permeable brick / stone / flat resin-based pavement Then, after laying No. 7 single-grain crushed stone defined by JIS standards, a compacting process was performed
pavement road surface construction method characterized by forming a single-grained crushed stone layer of mm to 100 mm,

[0010] 3. Excavating the road surface to a certain depth to form a subgrade, laying gravel or crushed stone on a flat subgrade to form a subgrade layer, further arranging a sand layer above the subgrade layer to form a sand cushion, Arrange a permeable block on the top, or in the pavement road surface construction method of permeable asphalt pavement or permeable brick, stone, flat resin-based pavement,
In place of the sand cushion as the sand layer, a single-grained crushed stone having a thickness of 20 mm to 150 mm is formed by laying a single-grained crushed stone of No. 7 defined by JIS standards and then performing a compaction step by a machine. Pavement road surface construction method,

4. Excavating the road surface to a certain depth to form a subgrade, laying gravel or crushed stone on a flat subgrade to form a subgrade layer, further arranging a sand layer above the subgrade layer to form a sand cushion, After laying a permeable sheet for preventing joint spillage on top, arranging permeable blocks and joint sand, or replacing the sand cushion, which is the sand layer, in the pavement road surface construction method of arranging permeable brick / stone / flat resin-based pavement Then, after laying No. 7 single-grain crushed stone defined by JIS standards, a compacting process was performed
The pavement road surface construction method is characterized in that one or more single-grained crushed stone layers having a thickness of 150 mm to 150 mm are formed.

[0012]

[0013]

[0014]

[0015]

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for constructing a pavement road according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing a pavement road surface structure constructed by the pavement road surface construction method according to the present invention.
The layer structure is, from below, a subgrade 1, a lower subgrade 2, an upper subgrade 3, a single-grained crushed stone layer 4, a joint spill-preventing permeable sheet 5, a permeable block 6, and joint sand 7.

The thickness of the single-grained crushed stone layer is 100 mm to 1 mm.
When it is set to 50 mm, the lower roadbed 2 can be omitted, but in this case, the rolling pressure before the construction of the water-permeable block 6 is required.

The lower subbase 2 and the upper subbase 3 may be formed according to a conventional construction method and structure, for example, a construction method and structure described in "Asphalt Pavement Guidelines" edited by Japan Road Association.

In the conventional pavement road surface structure, a sand cushion formed of so-called sand such as mountain sand, river sand, and sea sand is used. In the pavement road surface construction method according to the present invention, the conventional sand cushion is used. As an alternative structure, a single crushed stone layer 4 is used. The single-grain crushed stone for forming the single-grain crushed stone layer 4 is made by crushing rocks and cobblestones with a crusher using crushed sand or simply called crushed sand.
No. 7 crushed stone defined in IS standard is used. If the particle size is smaller than No. 7, it is not preferable because the water permeability is poor, and if the particle size exceeds 19 mm, it is not preferable because the layer cross section cannot be formed homogeneously and so-called rattling may occur.

When the priority is given to water permeability, the thickness of the single-grained crushed stone layer 4 is 20 mm to 100 mm, preferably 25 mm.
mm to 50 mm, and when priority is given to water retention, 2
0 mm to 150 mm, preferably 100 mm to 150 m
m. Thickness of single-grained crushed stone layer is 100mm ~ 150m
If m, the lower subbase 2 can be omitted,
In this case, it is necessary to perform rolling before the construction of the water-permeable block 6. In addition, depending on the purpose of construction, the amount of water retention can be increased by forming the single-grain crushed stone layer 4 into a plurality of layers (15% in the case of the crushed stone bed 40-0).

The single-grain crushed stone layer 4 is formed of only the above-described single-grain crushed stone, and in addition thereto, barley rock or ceramic balls (trademark of Onoda Cement Co., Ltd.) as long as the effects of the present invention are not impaired. Mixed with various waste materials or slags (for example, various recycled materials such as glass, tile, concrete asphalt, brick, sludge treating agent, rubber chips, and plastic crushed materials) in which the water is purified by water purification or particle size adjustment. There is an aspect corresponding to ecology.

The sand cushion in the conventional pavement structure functions as a cushion by a layer of sand. However, in actual construction, the compacting process is performed simply by disposing the sand to a predetermined thickness. Absent. On the other hand, in the method of the present invention, in order to form the single-grain crushed stone layer 4,
After laying the crushed stone to a predetermined thickness, a compacting step by a machine is performed.

In addition, when applied to asphalt pavement, a prime coat or tack coat can be used, and when applied to other pavements, an adhesive or hardener can be used to a single particle size.

A water-permeable sheet 5 for preventing joint loss is laid on the above-mentioned single-grain crushed stone layer 4, and is used for preventing the joint sand 7 from sinking or penetrating into the lower layer and disappearing. For example, the following are preferably used. Permeable sheet 5 to prevent joint loss
Specific examples thereof include a water-permeable nonwoven fabric (for example, a nonwoven fabric made of synthetic fiber), a water-permeable synthetic resin sheet or film (a sheet or film having punched holes, a water-permeable sheet or film containing a filler, and the like).

In the case where an aspect using a water-permeable sealing material or the like without forming the joint with sand is adopted, the water-permeable sheet for preventing joint disappearance may not be used.

As the water permeable block 6, the following can be preferably used. For example, Japanese Unexamined Utility Model Publication No. Sho 62-85502 discloses a block having a water permeability and a water retaining function and adjusting the amount of rainwater permeated into a roadbed.
No. 402, a block having the structure of “porous resin concrete water-permeable portion”
A block having the structure of "porous surface layer" described in JP-A-81309 can be adopted, and when a roadway structure is used, reinforcing materials such as carbon fiber, steel fiber, and stainless steel fiber are provided in these. It is preferable to use one. Further, the water-permeable block may have an interlocking block structure.

The thickness of the water-permeable block 6 is selected according to the use of the pavement road surface for a sidewalk, a park, a parking lot, a roadway, and the like, and is also determined by the presence or absence of a reinforcing material.

The width of the joint is usually about 3 mm, but may be, for example, about 9 mm. Joint width is 3m
In the case of m or more, it is preferable to use joint sand as large as possible within a range that enters the joint, for example, joint sand having a size of 3 to 6 mm.

[0030]

【Example】

Example 1 roadbed crushed stone section, portion and the thickness of the sidewalk portion parts construction 2800 m ² single-size crushed stone layer and 30 to 50 mm 2600 m
And ² were construction of two positions places 200 meters ² of the thickness of a single grain size crushed stone layer was 100 to 150 mm. In addition, about the place where the thickness of the single-grain crushed stone layer was 100-150 mm, the lower subgrade was omitted and compaction was performed before construction of the water-permeable block.

In Example 1, in the case of precipitation of 20 mm / 1 hour, the thickness of the single-grained crushed stone layer was set to 30 to 50 mm for 27 to 45 minutes, and the thickness of the single-grained crushed stone layer was set to 100 to 100 mm.
At a position of 150 mm, water retention of 90 to 135 minutes was possible.

Regarding the water holding capacity, a single-grain crushed stone was placed in an acrylic box, the single-grain crushed stone was vibrated, the water was injected, water was checked visually, and the volume before and after the water holding was measured. The water retention was determined by weighing and found to be over 30%.

Example 2 Construction was performed on a concrete roadbed part, a partly constructed sidewalk of 5500 m ² , where the thickness of the single-grained crushed stone layer was 30 to 50 mm.

In Example 2, there was no problem in the construction in rainy weather, and the vehicle could pass at a constant speed before finishing. Even after 50 days, there were no irregularities.

Since the liquefaction phenomenon was not found in both Examples 1 and 2, construction was possible in rainy weather, and mechanical construction which was impossible in the case of the conventional sand cushion layer made of sand was performed. The construction was completed with only one effort and period.

[0036]

According to the pavement road construction method having water permeability and / or water retention according to the present invention, unlike the conventional permeable pavement construction method, JIS is used instead of sand cushion with sand.
The following effects are obtained because the single-grain crushed stone layer made of No. 7 single-grain crushed stone defined by the standard is used.

In recent years, it has become difficult to obtain high-quality sand. By using single-grained crushed stone that can be diverted from recycled materials instead of sand, it is extremely easy to secure the material. Not only that, but it is also possible to significantly reduce costs. In addition, by using single-grained crushed stone, which has conventionally tended to be left without an effective use method, the manufacturing cost of crushed stone in general can be reduced.

Unlike a conventional sand cushion layer made of sand, which has been difficult to construct in rainy weather due to problems such as outflow of sand,
The use of single-grained crushed stones not only allows construction in rainy weather, but also allows for mechanical construction due to the low rate of soil change and allows constant-speed vehicle traffic before finishing. Therefore, the construction efficiency was significantly improved.

In a conventional sand cushion layer made of sand,
Water permeability may be lost due to solidification or clogging of sand, but a single-grained crushed stone layer has the advantage that such a situation does not occur. Also, unlike conventional sand, in a layer made of single-grain crushed stone, voids are easily formed between crushed stones,
Not only can the water permeability be significantly improved, but it also has the effect of increasing the water retention capacity.

Furthermore, unlike sand, there is no sedimentation or infiltration into the lower layer, so that the degree of conversion of the sand is about 28% (refer to the reference).
On the other hand, since it is about 11% in single-grain crushed stone,
It is effective in preventing unevenness, and single-grained crushed stones are more effective in supporting the force from above than sand, so that they are also effective in making the support rate uniform. Sand can easily move and flow even by the force from the side, but it is unlikely to occur with single-grained crushed stone, and with conventional sand cushions, the situation where the sand may run off occurs However, such a situation does not occur in the single-grained crushed stone layer.

Furthermore, unlike the conventional sand layer, the single-grain crushed stone layer has many voids formed between the crushed stones, and the voids improve water retention. Accordingly, in the summer, the retained water evaporates to lower the road surface temperature, and in the winter, the retained water improves the geothermal conductivity, thereby increasing the road surface temperature. Furthermore, even if the precipitation amount is 30 mm per hour (in the case of Tokyo, the amount of sewage overflows), it is very easy to cope with the water retention amount according to the present invention.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a pavement road surface structure according to the present invention.

[Explanation of symbols]

 1-subgrade 2-lower subgrade 3-upper subgrade 4-single-grained crushed stone layer 5-joint loss prevention sheet 6-permeable block 7-joint sand

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) E01C 5/00-5/22 E01C 3/06 E01C 7/18

Claims (4)

(57) [Claims] 1. Excavating a road surface to a certain depth to form a subgrade,
A subbase layer is formed by laying gravel or crushed stone on a flat roadbed, and a sand layer is further placed on the subbase layer to form a sand cushion, on which a permeable block is arranged or permeable asphalt pavement Or permeable bricks, stones,
In the pavement road surface construction method of performing flat resin pavement, in place of the sand cushion as the sand layer, a single-grained crushed stone of No. 7 defined by JIS standards is laid, and then a compacting process by a machine is performed to obtain a thickness of 20 mm to 100 mm. A pavement road construction method characterized by forming a single-grained crushed stone layer. 2. Excavating a road surface to a certain depth to form a subgrade,
Laying gravel or crushed stone on a flat roadbed to form a subbase layer, further placing a sand layer on top of the subbase layer to form a sand cushion, and laying a permeation sheet to prevent joints from flowing out In a pavement road surface construction method for arranging a permeable block and joint sand, or a permeable brick / stone / flat resin-based pavement, in place of the sand cushion as the sand layer, a single grain size of No. 7 defined in JIS standard After laying the crushed stone, the compaction process by machine is performed and the thickness is 20mm ~
A pavement road surface construction method characterized by forming a single-grained crushed stone layer of 100 mm. 3. Excavating a road surface to a certain depth to form a subgrade,
A subbase layer is formed by laying gravel or crushed stone on a flat roadbed, and a sand layer is further placed on the subbase layer to form a sand cushion, on which a permeable block is arranged or permeable asphalt pavement Or permeable bricks, stones,
In the pavement road surface construction method of performing flat resin pavement, in place of the sand cushion as the sand layer, a single-grained crushed stone of No. 7 defined by JIS standards is laid, and then a compacting process by a machine is performed to a thickness of 20 mm to 150 mm. A pavement road surface construction method comprising forming one or more single-grain crushed stone layers. 4. Excavating a road surface to a certain depth to form a subgrade,
Laying gravel or crushed stone on a flat roadbed to form a subbase layer, further placing a sand layer on top of the subbase layer to form a sand cushion, and laying a permeation sheet to prevent joints from flowing out In a pavement road surface construction method for arranging a permeable block and joint sand, or a permeable brick / stone / flat resin-based pavement, in place of the sand cushion as the sand layer, a single grain size of No. 7 defined in JIS standard After laying the crushed stone, the compaction process by machine is performed and the thickness is 20mm ~
A pavement road construction method comprising forming one or more layers of 150 mm single-grained crushed stone.