JP2021070965A - Paving method and paving structure - Google Patents

Abstract

To eliminate the need for end restraints such as curbstones.SOLUTION: A paving method using a pavement block 9 includes the steps of: forming a roadbed layer 3 on a roadbed; adhering the pavement block 9 positioned at least at the end of a pavement block laying area to the roadbed layer 3; forming a sand layer 5 on the roadbed layer 3 in the pavement block laying area for laying a pavement block other than the pavement block adhered to the roadbed layer 3; and laying the pavement block 9 on the sand layer 5.SELECTED DRAWING: Figure 5

Description

The present invention relates to a pavement method and a pavement structure that do not require an end restraining material such as a curb.

Interlocking block pavement fills the joints between blocks with sand, and when a wheel load is applied on the blocks, the effect of meshing between adjacent blocks produces a load distribution effect, which is used to create a load distribution effect from the sidewalk to the roadway. It is a pavement that can be widely applied to.

FIG. 1 shows the principle of load distribution in interlocking block pavement. The block directly under the wheel load undergoes shear deformation in the joint sand that is in a dense state due to bending. Due to this shear deformation, joint sand accumulates and expands (positive dialectance), generating a horizontal compressive force between blocks and transmitting a load between adjacent blocks. Therefore, interlocking block pavement. Is called.

The sand paving in the interlocking block pavement ensures the stability and flatness of the block, and also has the role of uniformly distributing the load applied to the interlocking block layer and transmitting it to the roadbed, and also for subsidence due to compaction on the block layer. Along with this, the upper part of the paving sand also has the role of filling the lower part of the joint. Further, shear deformation occurs due to repeated traffic loads, and the meshing between blocks gradually becomes stronger under the traffic load. During construction and under traffic loads, horizontal compressive forces between blocks due to the positive diretency of the joint sand are generated, which produces a load distribution effect, so it is possible to generate reaction forces against these compressive forces. Restraint of the pavement edge that can be done is indispensable. In this way, the interlocking block pavement exhibits load distribution performance by integrating "blocks, paving sand, joint sand and restraint of pavement edges".

Patent Document 1 discloses an interlocking block provided with an uneven portion on a side surface and a protrusion for securing a joint width. In this interlocking block, even if the uneven portion is laid in any pattern of herringbone bond, stretcher bond, or parquet bond corresponding to the unevenness of the adjacent interlocking block, other than the protrusion for securing the joint width. The protrusions for securing the joint width are configured so that the side surfaces of the portions do not come into contact with the side surfaces of the portion other than the protrusions for securing the joint width in the adjacent interlocking block.

Further, Patent Document 2 discloses an interlocking block in which a convex portion and a concave portion are formed on a side surface. This interlocking block is provided with protrusions for securing the joint width straddling both sides of the most advanced portion of the convex portion.

Japanese Unexamined Patent Publication No. 2000-240002 Japanese Unexamined Patent Publication No. 2000-25709

As mentioned above, in interlocking block pavement, pavement that can generate a reaction force against the compressive force generated in the horizontal direction between blocks due to the positive diretency of joint sand during construction or under traffic load. Restraint of the edges is essential. That is, when constructing interlocking block pavement, it is essential to attach it to asphalt pavement or the like, and at that time, it is necessary to install an "end restraint material". Generally, a curbstone (width 100 mm to 150 mm, length 600 mm) of a secondary concrete product is used as the "end restraint material", but in the application where vehicles pass, the curbstone is chipped during operation. Cracks, steps and subsidence may occur, causing problems such as steps in the interlocking block pavement. This is because the length of the curb (600mm) is large relative to the width (100mm to 150mm), so it does not follow the deflection due to traffic load, and the width is short, and the ratio of width to length is "1: 4 to". Because it is as large as 1: 6 ", it is due to the fact that it is easily cracked.

FIG. 2 is a diagram showing a structural example of a concrete curb. As shown in FIG. 2, the foundation of the curb is made by placing concrete on crushed stone, laying mortar for the leveling layer, and using mortar for the joints. Since it is constructed by a wet method, it requires cost, curing, and construction period, and also requires the expertise of the builder.

In order to improve this situation, products with a revised cross section have been proposed. This product has a width and thickness of 200 mm and a length of 400 mm, does not require mortar, and can be constructed with joint sand or paving sand. Therefore, it is possible to open the traffic immediately, and it is possible to prevent the product from cracking or stepping. However, since the product thickness is 20 cm and the sand layer is 2 cm, which is a total thickness of 22 cm, there remains a problem that it must be cut deeply in a narrow span like a conventional curb.

In addition, recently, interlocking block pavement is increasingly being used for repair work of existing pavement. In this case, the existing pavement is cut with a width of 100 mm to 120 mm to obtain the thickness of the interlocking block. The interlocking block is laid so that the thickness is 80 mm to 100 mm and the thickness of the paving sand is 20 mm.

Here, when installing a curb at the end of the pavement, as shown in Fig. 3 and Fig. 4, it is asphalt pavement after excavating widely not only for the depth but also for the width of the curb (100 mm to 200 mm). It is necessary to pave.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a pavement method and a pavement structure that do not require an end restraining material such as a curb.

(1) In order to achieve the above object, the present invention has taken the following measures. That is, the pavement method of the present invention is a pavement method using a pavement block, in which a step of forming a roadbed layer on the roadbed and a pavement block located at least at an end of a pavement block laying area are formed on the roadbed layer. A step of forming a sand layer on the roadbed layer in the pavement block laying area for laying a pavement block other than the pavement block adhered to the roadbed layer, and a pavement on the roadbed layer. It is characterized by including a step of laying a pavement block.

In this way, since the pavement block located at least at the end of the pavement block laying area is adhered to the roadbed layer, an end restraining material such as a curb is not required. As a result, it is possible to realize a pavement with a sense of unity, reduce costs, and shorten the construction period.

(2) Further, in the paving method of the present invention, the steps of adhering the paving block to the roadbed layer include a step of providing a first polymer cement paste layer on the roadbed layer and the first polymer cement paste layer. It is characterized in that it is composed of a step of providing a mortar layer on the mortar layer and a step of providing a second polymer cement paste layer on the mortar layer.

With this configuration, the adhesive strength is increased, and it is possible to exert the effect as an end restraining material equal to or higher than that of the concrete curb.

(3) Further, the pavement method of the present invention is further characterized by further including a step of attaching a molded joint material between the pavement block located at the end of the laying area of the pavement block and the asphalt pavement surface. ..

With this configuration, it is possible to prevent rainwater or the like from penetrating between the pavement block and the asphalt pavement and damage to the pavement block.

(4) Further, the pavement method of the present invention further includes a step of laying a geogrid on the sand layer, and is characterized in that a pavement block is laid on the geogrid.

With this configuration, when a wheel load of a vehicle or the like is applied, the sand (joint sand) filled in the joints between the pavement blocks exerts an effect of meshing the pavement blocks with each other, which cannot be obtained by the conventional mortar joints. To. The load can be dispersed by this meshing effect.

(5) Further, the pavement structure of the present invention is a pavement structure using a pavement block, in which a roadbed layer formed on the roadbed and a pavement block located at least at the end of a pavement block laying area are provided. A pavement formed on the roadbed layer in the pavement block laying area for laying a first pavement block layer adhered to the roadbed layer and a pavement block other than the pavement block adhered to the roadbed layer. It is characterized by including a sand layer and a second pavement block layer laid on the paving sand layer.

In this way, since the pavement block located at least at the end of the pavement block laying area is adhered to the roadbed layer, an end restraining material such as a curb is not required. As a result, it is possible to realize a pavement with a sense of unity, reduce costs, and shorten the construction period.

According to the present invention, since the pavement block located at least at the end of the pavement block laying area is adhered to the roadbed layer, an end restraining material such as a curb is not required. As a result, it is possible to realize a pavement with a sense of unity, reduce costs, and shorten the construction period.

It shows the principle of load distribution in interlocking block pavement. It is a figure which shows the structural example of a concrete curb. It is a figure which shows the example of rubbing a conventional curb. It is a figure which shows the example of rubbing a curb whose cross section was reviewed. It is a figure which shows the outline of the pavement structure using the interlocking block which concerns on embodiment of this invention. It is a figure which shows the outline of the interlocking block which concerns on this embodiment. It is a flowchart which shows the procedure of the pavement method which concerns on this embodiment. It is a figure which shows the Example of this invention.

As a result of diligent studies on the pavement method of interlocking block pavement in heavy traffic / heavy load areas, the present inventors have adhered the interlocking block located at least at the end of the interlocking block laying area to the roadbed layer. As a result, it has been found that the end restraining material such as a curb can be eliminated and the cost, construction period, etc. can be reduced, and the present invention has been reached.

That is, the pavement method of the present invention is a pavement method using an interlocking block, in which a step of forming a roadbed layer on the roadbed and an interlocking block located at least at an end of an interlocking block laying area are formed on the roadbed layer. A step of forming a sand layer on the roadbed layer in the interlocking block laying area for laying an interlocking block other than the interlocking block adhered to the roadbed layer, and an interlocking on the roadbed layer. It is characterized by including a step of laying a locking block.

As a result, the present inventors have realized a pavement with a sense of unity, and made it possible to reduce the cost and the construction period. Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 5 is a diagram showing an outline of a pavement structure using an interlocking block according to an embodiment of the present invention. This pavement structure is supposed to be applied to heavy traffic and heavy load areas, and instead of the conventional concrete curb, a 100 mm thick interlocking block is bonded to the roadbed layer using a special mortar. And make it function as an end restraint. At this time, the adhesiveness is further enhanced by applying the polymer cement paste to the upper and lower layers of the special mortar. As for the special mortar, early-strength cement may be applied instead of ordinary cement in consideration of the construction time and the like. In the present embodiment, an example using a special mortar is shown, but the present invention is not limited to the special mortar, and a so-called ordinary mortar can also be applied.

In FIG. 5, in the pavement structure 1, the roadbed layer 3 formed on the roadbed and the interlocking blocks 9a and 9b located at the end of the interlocking block laying area are bonded to the roadbed layer 3. The locking block layer 10 is formed. Further, a sand layer 5 formed on the roadbed layer 3 in the interlocking block laying area for laying interlocking blocks 9c, 9d, 9e other than the interlocking blocks 9a and 9b adhered to the roadbed layer 3 and a sand layer. A second interlocking block layer 12 composed of interlocking blocks 9c and 9d laid on the 5 is provided.

Further, the pavement structure 1 is provided on the first polymer cement paste layer 13a provided on the roadbed layer 3, the special mortar layer 13b provided on the first polymer cement paste layer 13a, and the special mortar layer 13b. It has a second polymer cement paste layer 13c that has been obtained. Further, the pavement structure 1 is filled with a molded joint material 8 between the interlocking block 9a and the asphalt pavement 7 (also referred to as “As pavement”). Further, in the pavement structure 1, the geogrid 15 is laid on the sand layer 5, and the interlocking blocks 9c and 9d are laid on the geogrid 15.

In the present embodiment, since the special mortar and the polymer cement paste are used in combination, it is possible to increase the adhesive strength of the interlocking block having a thickness of 100 mm. It will be possible.

Here, the special mortar is, in the example of the present embodiment, a mortar obtained by adding organic fibers for mixing mortar to a general mortar composed of cement, silica sand, and water. The feature of this special mortar is that cracking and fine granulation of the mortar can be suppressed by adding organic fibers. It also has the characteristics of improved durability and reduced maintenance costs. More specifically, the fiber is an organic / inorganic fiber that can be added to mortar such as vinylon fiber, polyethylene fiber, polypropylene fiber, nylon fiber, carbon fiber, and glass fiber. In addition to the special mortar, any mortar using cement and sand can be applied as the present invention. The thickness of the special mortar can be 20 mm to 30 mm.

Further, the polymer cement paste is composed of an acrylic polymer emulsion for mixing cement, water and mortar in the example of the present embodiment, and is used in a ratio of 1 to 3 water to 1 acrylic polymer emulsion. It is possible to realize high adhesive strength as compared with the case where the acrylic polymer emulsion is not used. More specifically, the type of polymer emulsion is for mixing mortars such as SBR (styrene butadiene rubber), EVA (ethylene vinyl acetate), and acrylics, and the polymer cement ratio is set to 1 as the ratio of polymer solids to cement. The range is from 0.0% to 36%. Not only polymer cement paste but also polymer cement mortar using cement, water, polymer emulsion and sand can be applied. The thickness of the polymer cement paste can be 1 mm to 3 mm.

Further, as shown in FIG. 5, the construction of adhering the interlocking blocks 9a and 9b to the roadbed layer 3 has the same excavation thickness as the normal interlocking block pavement in which the interlocking blocks 9c and 9d are laid on the sand layer 5. It can be installed at (120 mm), eliminating the need for rubbing with asphalt pavement. The joint width is 3 mm, which is generally used, and asphalt-based sand or a material having a water-repellent effect is used for the joints in order to prevent rainwater or the like from penetrating from the joints.

Further, as shown in FIG. 5, measures against steps and sinking that are likely to occur at the boundary between the construction site of the first polymer cement paste layer 13a, the special mortar layer 13b, and the second polymer cement paste layer 13c and the sand paving site. As a result, the geogrid 15 is laid on the sand layer 5 with a constant width.

FIG. 6 is a diagram showing an outline of the interlocking block according to the present embodiment. In this embodiment, a rectangular corrugated block having an excellent meshing effect is used. This makes it possible to enhance the load distribution effect. Further, as shown in FIG. 6, since the ratio of the short side to the long side of the block is 1: 2, cracking is extremely unlikely to occur. Compared with the sand laying method, the block and the special mortar layer are in close contact with each other, so that higher load distribution performance can be exhibited. As a result, it is possible to suppress steps and sinking. It is also possible to use natural stone or brick instead of the interlocking block that functions as an end restraint material. In this case, the thickness is 80 mm to 120 mm, and the shape is any of corrugated type, straight type, and corrugated / straight type.

Next, a pavement method of the pavement structure configured as described above will be described. FIG. 7 is a flowchart showing the procedure of the pavement method according to the present embodiment.

First, a roadbed layer is formed on the roadbed (step S1). Next, the block as the end restraining material is adhered to the roadbed layer (step S2). That is, the endmost portion of the interlocking block laying area and the interlocking block located second from this endmost portion are adhered to the roadbed layer. In this bonding step, a first polymer cement paste layer is provided on the roadbed layer, a special mortar layer is provided on the first polymer cement paste layer, and a second polymer cement paste layer is provided on the special mortar layer. It consists of the steps to be provided. With this configuration, the adhesive strength is increased, and it is possible to exert the effect as an end restraining material equal to or higher than that of the concrete curb.

Further, a molded joint material is attached between the interlocking block located at the end of the laying area of the interlocking block and the asphalt pavement surface (step S3). With this configuration, it is possible to prevent rainwater or the like from penetrating between the interlocking block and the asphalt pavement and damage to the interlocking block.

Next, a sand layer is formed on the roadbed layer in the interlocking block laying area where the interlocking block other than the interlocking block adhered to the roadbed layer is laid (step S4). Further, a geogrid is laid in a certain area on the sand layer (step S5), an interlocking block is laid on the geogrid, and interlocking is laid on the sand layer in the area where the geogrid is not laid. The block is laid (step S6). Finally, the joint sand is filled (step S7), and the process ends. With this configuration, when a wheel load of a vehicle or the like is applied, the sand (joint sand) filled in the joints between the interlocking blocks exerts an effect of meshing the interlocking blocks with each other. The load can be dispersed by this meshing effect.

FIG. 8 is a diagram showing an embodiment of the present invention. This example shows an outline of the case where the present invention is applied to Kobe Port Island. The construction area has a width of 20,000 mm on the doorway side and a depth of 20,000 mm from the doorway side. As an end constraint of the interlocking block, a 100 mm thick interlocking block is adhered. As shown in FIG. 8, the basic pattern is to surround the circumference with a width of 228 mm like a frame to distinguish it from the inner laying pattern (frame construction method).

According to the present embodiment, since the interlocking block located at least at the end of the interlocking block laying area is adhered to the roadbed layer, the “rubbing section” as in the conventional construction method becomes unnecessary. As a result, it is possible to reduce the cost and shorten the construction period. In addition, since no concrete curb is used, it is possible to obtain a sense of unity in the appearance after construction.

1 Pavement structure 3 Roadbed layer 5 Paving sand layer 7 Asphalt pavement 8 Molded joint materials 9, 9a, 9b, 9c, 9d Interlocking block 10 First interlocking block layer 12 Second interlocking block layer 13a First polymer cement Paste layer 13b Special mortar layer 13c Second polymer cement paste layer 15 Geogrid

Claims (5)

It is a pavement method that uses paving blocks.
The process of forming a roadbed layer on the roadbed and
The step of adhering the pavement block located at least at the end of the pavement block laying area to the roadbed layer, and
A step of forming a sand layer on the roadbed layer in the pavement block laying area for laying a pavement block other than the pavement block adhered to the roadbed layer.
A pavement method comprising a step of laying a pavement block on the sand layer. The step of adhering the pavement block to the roadbed layer is
The step of providing the first polymer cement paste layer on the roadbed layer and
A step of providing a mortar layer on the first polymer cement paste layer and
The pavement method according to claim 1, further comprising a step of providing a second polymer cement paste layer on the mortar layer. The pavement method according to claim 1 or 2, further comprising a step of attaching a molded joint material between the pavement block located at the end of the laying area of the pavement block and the asphalt pavement surface. Further including a step of laying a geogrid on the sand layer,
The pavement method according to any one of claims 1 to 3, wherein a pavement block is laid on the geogrid. It is a pavement structure using paving blocks.
The roadbed layer formed on the roadbed and
A first pavement block layer in which a pavement block located at least at the end of the pavement block laying area is adhered to the roadbed layer, and
A pavement block for laying a pavement block other than the pavement block adhered to the roadbed layer, and a sand layer formed on the roadbed layer in the pavement block laying area.
A pavement structure including a second pavement block layer laid on the sand layer.

Images