JP7239448B2 - Pavement method and pavement structure - Google Patents

Description

The present invention relates to a paving method and pavement structure that do not require edge restraining materials such as curbs.

Interlocking block pavement is made by filling the joints between blocks with sand. When a wheel load is applied to the blocks, the interlocking effect of the adjacent blocks creates a load distribution effect. It is a pavement that can be widely applied to

FIG. 1 shows the principle of load distribution in interlocking block pavement. Blocks directly under the wheel load cause shear deformation in the dense joint sand due to deflection. Due to this shear deformation, the joint sand accumulates and expands (positive dilatancy), which generates a horizontal compressive force between blocks and transfers the load between adjacent blocks. called.

Sand in interlocking block pavement ensures the stability and flatness of the blocks, distributes the load applied to the interlocking block layer evenly and transfers it to the roadbed, and prevents subsidence due to compaction on the block layer. Along with this, the upper part of the bed sand also plays a role of filling the lower part of the joint. Furthermore, repeated traffic loads cause shear deformation, which gradually strengthens the engagement between blocks under the traffic load. During construction and under traffic load, horizontal compressive force between blocks due to the positive dilatancy of joint sand is generated, and the load distribution effect is generated, so it is possible to generate a reaction force against these compressive forces. Constraint of the pavement edge that can be done is indispensable. In this way, interlocking block pavement exerts load distribution performance by combining "blocks, bed sand, joint sand, and pavement edge restraint".

Patent Literature 1 discloses an interlocking block provided with an uneven portion on the side surface and a protrusion for securing a joint width. In this interlocking block, even if the uneven part is laid in any pattern of herringbone bond, stretcher bond, and parquet bond so as to correspond to the uneven part of the adjacent interlocking block, the protrusions other than the protrusions for securing the joint width can be used. The protrusion for securing the joint width is configured so that the side surface of the portion does not come into contact with the side surface of the adjacent interlocking block other than the protrusion for securing the joint width.

Further, Patent Literature 2 discloses an interlocking block in which a convex portion and a concave portion are formed on the side surface. This interlocking block is provided with projections for ensuring joint width extending over both sides of the tip end of the projection.

JP-A-2000-240002 JP-A-2000-257009

As described above, the interlocking block pavement is capable of generating a reaction force against the compressive force generated in the horizontal direction between blocks due to the positive dilatancy of the joint sand during construction and under traffic load. End restraint is essential. That is, when constructing interlocking block pavement, it is essential to attach it to asphalt pavement, etc., and at that time, it is necessary to install "end restraining materials". In general, secondary concrete product curbs (100 mm to 150 mm in width and 600 mm in length) are used as "end restraint materials", but in applications where vehicles pass, the curbs may chip during use. Cracks, steps and subsidence may occur, causing defects such as steps in interlocking block pavement. This is because the length of the curbstone (600mm) is longer than the width (100mm to 150mm), so it does not follow the deflection due to traffic load, and the width is short, so the ratio of width to length is "1:4 ~ 1:6", so it is easy to crack.

Figure 2 shows an example of the structure of a concrete curbstone. Since it is constructed by the wet construction method, it requires cost, curing, and construction period, and furthermore, the contractor's expertise is required.

In order to improve this situation, products with revised cross sections 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 and bed sand. As a result, it is possible to immediately open up the traffic, and it is possible to prevent cracks in the product and generation of steps. However, since the total thickness of the product is 20 cm and the bed layer is 2 cm, the total thickness is 22 cm. As with conventional curbs, the problem of having to cut deeply in a narrow span remained.

In recent years, interlocking block pavement is increasingly being used for repair work on existing pavement. is 80 mm to 100 mm, and the thickness of the bed sand is 20 mm, and interlocking blocks are laid.

Here, when installing a curb at the edge of the pavement, as shown in Figures 3 and 4, not only the depth but also the width of the curb (100 mm to 200 mm) is excavated widely and the asphalt is paved after the curb is installed. need to be installed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a paving method and paving structure that do not require edge restraining materials such as curbs.

(1) In order to achieve the above objects, the present invention takes the following means. That is, the paving method of the present invention is a paving method using paving blocks, comprising the steps of: forming a roadbed layer on a roadbed; forming a bed sand layer on the roadbed layer in a paving block laying area for laying paving blocks other than the paving blocks adhered to the roadbed layer; paving on the bed sand layer and a step of laying a block for use.

In this way, since the paving blocks positioned at least at the ends of the paving block laying area are adhered to the roadbed layer, edge restraining materials such as curbs are not required. As a result, it is possible to realize pavement with a sense of unity, reduce costs, and shorten the construction period.

(2) In the paving method of the present invention, the step of adhering the paving block to the roadbed layer includes the step of providing a first polymer cement paste layer on the roadbed layer; The method comprises the steps of: providing a mortar layer thereon; and 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 an effect as an end restraining member equal to or greater than that of a concrete curbstone.

(3) In addition, the paving method of the present invention is characterized by further including the step of attaching a molded joint material between the paving blocks located at the ends of the area where the paving blocks are laid and the asphalt pavement surface. .

With this configuration, it is possible to prevent permeation of rainwater or the like between the pavement blocks and the asphalt pavement and damage to the pavement blocks.

(4) In addition, the paving method of the present invention is characterized by further including the step of laying a geogrid on the sand bed layer, and laying paving blocks on the geogrid.

With this configuration, when the wheel load of a vehicle or the like is applied, the sand (joint sand) filled in the joints between the paving blocks exerts the intermeshing effect of the paving blocks, which cannot be obtained with the mortar joints of the conventional construction method. be. This meshing effect can distribute the load.

(5) Further, the pavement structure of the present invention is a pavement structure using paving blocks, wherein the roadbed layer formed on the roadbed and the paving blocks positioned at least at the ends of the paving block laying area are a first paving block layer adhered to the roadbed layer; It is characterized by comprising a sand layer and a second pavement block layer laid on the sand bed layer.

In this way, since the paving blocks positioned at least at the ends of the paving block laying area are adhered to the roadbed layer, edge restraining materials such as curbs are not required. As a result, it is possible to realize pavement with a sense of unity, reduce costs, and shorten the construction period.

According to the present invention, since the paving blocks positioned at least at the ends of the paving block laying area are adhered to the roadbed layer, edge restraining materials such as curbs are not required. As a result, it is possible to realize 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 the conventional rubbing of a curb. It is a figure which shows the example of rubbing of the curb which reviewed the cross section. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the outline|summary of the pavement structure using the interlocking block which concerns on embodiment of this invention. It is a figure which shows the outline|summary of the interlocking block which concerns on this embodiment. It is a flow chart which shows the procedure of the pavement method concerning this embodiment. It is a figure which shows the Example of this invention.

The present inventors have made intensive studies on interlocking block pavement paving methods in heavy traffic/heavy load areas. As a result, the inventors have found that end restraining materials such as curbs can be made unnecessary, and the cost, construction period, etc. can be reduced, leading to the present invention.

That is, the paving method of the present invention is a paving method using interlocking blocks, comprising the steps of: forming a roadbed layer on a roadbed; forming a bed layer on the roadbed layer in an interlocking block laying area where interlocking blocks other than the interlocking blocks adhered to the roadbed layer are laid; and C. Laying a locking block.

As a result, the present inventors have realized pavement with a sense of unity, and have made it possible to reduce costs and shorten 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 interlocking blocks according to an embodiment of the present invention. This pavement structure is expected to be applied to heavy traffic and heavy load areas, and 100mm thick interlocking blocks are glued to the roadbed layer using special mortar instead of the conventional concrete curbs. and act as an end restraint. At this time, the adhesion is further enhanced by applying polymer cement paste to the upper and lower layers of the special mortar. For the special mortar, high-early-strength cement may be applied in place of ordinary cement in consideration of the construction period and the like. In this embodiment, an example using special mortar is shown, but the present invention is not limited to special mortar, and so-called normal mortar can also be applied.

In FIG. 5, the pavement structure 1 includes a roadbed layer 3 formed on the roadbed, and interlocking blocks 9a and 9b located at the ends of the interlocking block laying area, which are bonded to the roadbed layer 3 as first interlocking blocks. A locking block layer 10 is constructed. Further, a sand layer 5 formed on the roadbed layer 3 in the interlocking block laying area where the interlocking blocks 9c, 9d and 9e other than the interlocking blocks 9a and 9b adhered to the roadbed layer 3 are laid, and a sand layer a second interlocking block layer 12 consisting of interlocking blocks 9c, 9d laid on 5;

Further, the pavement structure 1 includes a first polymer cement paste layer 13a provided on the roadbed layer 3, a special mortar layer 13b provided on the first polymer cement paste layer 13a, and a special mortar layer 13b provided on the special mortar layer 13b. a second polymer cement paste layer 13c. Further, in the pavement structure 1, a molded joint material 8 is filled between the interlocking blocks 9a and the asphalt pavement 7 (also referred to as "As pavement"). In the pavement structure 1, a geogrid 15 is laid on the bed sand layer 5, and interlocking blocks 9c and 9d are laid on the geogrid 15. As shown in FIG.

In this embodiment, since the special mortar and polymer cement paste are used together, it is possible to increase the adhesive strength of the interlocking block with a thickness of 100 mm, so that it can function as an end restraining material equal to or greater than that of a concrete curbstone. It becomes possible.

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

In addition, in the example of the present embodiment, the polymer cement paste is composed of cement, water, and an acrylic polymer emulsion for mixing with mortar. It is possible to achieve a higher adhesive strength than when the acrylic polymer emulsion is not used. More specifically, the type of polymer emulsion is SBR (styrene butadiene rubber), EVA (ethylene vinyl acetate), acrylic, etc., for mixing with mortar, and the ratio of polymer solids to cement is 1. 0% to 36%. In addition to polymer cement paste, polymer cement mortar using cement, water, polymer emulsion, and sand can also be applied. Also, the thickness of the polymer cement paste can be 1 mm to 3 mm.

In addition, as shown in FIG. 5, the work of bonding the interlocking blocks 9a and 9b to the roadbed layer 3 requires the same excavation thickness as that of ordinary interlocking block pavement in which the interlocking blocks 9c and 9d are laid on the sand layer 5. (120 mm), making it unnecessary to rub asphalt pavement. The joint width is 3 mm, which is generally used, and in order to prevent penetration of rainwater and the like from the joint, asphalt-based bedding sand or water-repellent material is used for the joint.

In addition, as shown in FIG. 5, steps and subsidence that are likely to occur at the boundary between the first polymer cement paste layer 13a, the special mortar layer 13b, and the second polymer cement paste layer 13c and the sand-covering site are also taken into consideration. As such, the geogrid 15 is laid with a constant width on the bed sand layer 5 .

FIG. 6 is a diagram showing an outline of an interlocking block according to this embodiment. In this embodiment, rectangular corrugated blocks are used which are excellent in meshing effect. This makes it possible to enhance the load distribution effect. In addition, as shown in FIG. 6, since the ratio of short sides to long sides of the block is 1:2, cracks are extremely unlikely to occur. Compared to the sand laying method, the blocks and the special mortar layer adhere to each other, making it possible to exhibit higher load distribution performance. As a result, it is possible to suppress steps and subsidence. It is also possible to use natural stone or brick in place of the interlocking block that functions as the end restraining member. In this case, the thickness should be 80 mm to 120 mm, and the shape should be any of a wave type, a straight type, and a wave/straight type.

Next, a paving method for the pavement structure configured as described above will be described. FIG. 7 is a flow chart showing the procedure of the paving method according to this embodiment.

First, a roadbed layer is formed on the roadbed (step S1). Next, a block as an end restraining member is adhered to the roadbed layer (step S2). That is, the extreme end of the interlocking block laying area and the interlocking block positioned second from the extreme end are adhered to the roadbed layer. The gluing step includes applying a first polymer cement paste layer to the subbase layer, applying a special mortar layer on the first polymer cement paste layer, and applying a second polymer cement paste layer on the special mortar layer. It consists of the step of providing. With this configuration, the adhesive strength is increased, and it is possible to exert an effect as an end restraining member equal to or greater than that of a concrete curbstone.

In addition, a molded joint material is applied between the interlocking block located at the end of the area where the interlocking block is laid and the asphalt pavement surface (step S3). With this configuration, it is possible to prevent permeation of rainwater or the like between the interlocking blocks and the asphalt pavement and damage to the interlocking blocks.

Next, a bed layer is formed on the roadbed layer in the interlocking block laying area where the interlocking blocks other than the interlocking blocks adhered to the roadbed layer are to be laid (step S4). Furthermore, a geogrid is laid in a certain range on the bed sand layer (step S5), interlocking blocks are laid on the geogrid, and interlocking blocks are laid on the bed sand layer in areas where no geogrid is laid. Blocks are 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 acts, sand (joint sand) filled in the joints between the interlocking blocks exerts an effect of meshing the interlocking blocks with each other. This meshing effect can distribute the load.

FIG. 8 is a diagram showing an embodiment of the present invention. This embodiment shows an overview of the application of the present invention 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. A 100 mm thick interlocking block is glued as an end restraint for the interlocking block. As shown in FIG. 8, the basic pattern is to enclose the periphery with a width of 228 mm like a frame to distinguish it from the inner laying pattern (frame construction method).

According to this embodiment, since the interlocking blocks positioned at least at the ends of the interlocking block laying area are adhered to the roadbed layer, there is no need for a "rubbing section" as in the conventional construction method. As a result, it is possible to reduce costs and shorten the construction period. In addition, since concrete curbs are not used, it is possible to obtain a sense of unity in the appearance after construction.

1 pavement structure 3 roadbed layer 5 bed sand layer 7 asphalt pavement 8 molded joint material 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)

A paving method for interlocking block pavement applied to heavy traffic and heavy load areas ,
forming a roadbed layer on the roadbed;
forming end restraints by adhering interlocking blocks located at least at the ends of the interlocking block laying area to the roadbed layer using special mortar and polymer cement paste ;
A step of forming a bed layer on the roadbed layer in an interlocking block laying area where interlocking blocks other than the interlocking blocks constituting the end restraining member are laid;
and a step of laying interlocking blocks on the sand bed layer. The step of configuring the end restraint includes:
applying a first polymer cement paste layer to the subbase layer;
providing a special mortar layer on the first polymer cement paste layer;
and providing a second polymer cement paste layer on said special mortar layer. 3. The paving method according to claim 1, further comprising the step of applying a molded joint material between the interlocking block located at the end of the interlocking block laying area and the asphalt pavement surface. further comprising the step of laying a geogrid on the bed sand layer;
4. The paving method according to any one of claims 1 to 3, wherein interlocking blocks are laid on said geogrid. A pavement structure of interlocking block pavement applied to heavy traffic and heavy load areas ,
a roadbed layer formed on the roadbed;
a first pavement block layer in which interlocking blocks located at least at the ends of the interlocking block laying area are adhered to the base course layer using special mortar and polymer cement paste , and end restraints are configured;
a sand bed layer formed on the roadbed layer in an interlocking block laying area where interlocking blocks other than the interlocking blocks adhered to the roadbed layer are laid;
and a second pavement block layer laid on the sand bed layer.

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