JP2011140830A - Gravel pavement and construction method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gravel pavement which prevents deviation and rutting of gravel or the like caused by walking of persons and travelling of bicycles, secures water-permeability and is simply constructed over a wide area without much costs. <P>SOLUTION: Open-graded mixtures 2 for pavement are laid uniformly on the pavement, and the pavement surface immediately after the procedure is rugged to form a base layer. Then aggregates 3 are scattered over the base layer surface 1 to form a surface layer. The aggregates 3 in contact with the base layer surface 1 are bonded together with the pavement bonding agent of the mixture 2, and are configured that the grain size of the open-graded mixture 2 for pavement is larger than that of the aggregates 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a gravel pavement in which gravel or the like is prevented from moving or offset on a so-called gravel road on which gravel-like aggregates are laid, and a construction method therefor.

  It has traditionally been common to place so-called gravel-like objects such as natural gravel and crushed stones in order to improve the walking sensation of pedestrians and landscapes, such as walking paths in parks, shrines and temples, and shrines. It is that.

When laying gravel-like aggregates in such places, lay gravel etc. in order to prevent gravel that has been laid down by walking or bicycle trafficking or digging. Is desirable.
Moreover, since it is mainly intended for pedestrians, it is also necessary to ensure water permeability so that water cannot be collected.

  Thus, Patent Document 1 discloses a gravel pavement in which a partition frame is laid and crushed stone is filled in the frame.

  Patent Document 2 discloses a pavement in which an epoxy resin is used as an adhesive and a roadbed and gravel are bonded and solidified with an epoxy resin.

JP 2006-241927 A JP 2005-256329 A

Gravel movement is regulated by the methods shown in Patent Document 1 and Patent Document 2, and the effect of preventing the gravel from being offset and digging is recognized.
However, in what is shown by patent document 1, since it is necessary to lay and fix a division frame body on a roadbed, it takes time and is not suitable for constructing gravel pavement in a wide range. Further, the roadbed for laying the partition frame body needs to be leveled for the installation of the partition frame body, and the roadbed surface needs to be flattened.

  Moreover, in what is shown by patent document 2, since an expensive thing is used as road construction materials, such as an epoxy resin and carbon fiber powder, raw material cost becomes high, and also the construction cost is high because the construction process is complicated. It becomes. Moreover, since water permeability is impaired by the epoxy resin, rainwater tends to accumulate on the gravel surface, and it becomes difficult to walk when it rains.

  That is, since it is intended for pedestrians, it is also important to ensure water permeability, and since it is not intended for vehicle travel, a gravel pavement that allows a large area to be constructed easily and without cost is desirable.

  The present invention has been made in view of such a problem, and the object of the present invention is to prevent the gravel and the like from drifting or digging due to walking or bicycle travel, and also to ensure water permeability and wide. An object of the present invention is to provide a gravel pavement that can be constructed in a simple and cost-effective manner.

  In order to achieve the above object, the construction method of the gravel pavement according to the present invention is the method in which the surface of the mixture is formed with irregularities on the surface of the mixture immediately after spreading the mixture of the open particle type for paving, and then the irregularities are formed. After the aggregate is sprayed, the aggregate and the mixture are simultaneously compacted from the surface of the aggregate by a compacting machine, and the aggregate is fixed to the uneven portion of the mixture.

  Moreover, in the construction method of the gravel pavement which concerns on this invention, it is preferable to enlarge the particle size of the said open-particle-type mixture for pavement with respect to the particle size of the said aggregate to spread.

  In the gravel pavement according to the present invention, a surface layer in which aggregate is dispersed is laid on a base layer made of a mixture of an open grain type for paving, and the aggregate in contact with the surface of the base layer of the surface layer is used for paving with the base layer. In addition to being bonded with a binder, the particle size of the open particle type mixture for paving is larger than the particle size of the aggregate.

  According to the gravel pavement and its construction method according to the present invention, it is possible to prevent the gravel and the like from drifting or digging due to walking or bicycle travel, further ensuring water permeability, and easily and without costly a large area. It is possible to provide gravel pavement that can be constructed on the ground.

It is a schematic diagram which shows the cross section of the engagement state of the base layer comprised with the mixture of the open particle size type for pavement of the gravel pavement which concerns on this invention, and the aggregate used as the surface layer laid on it.

  In the present invention, the pavement open particle size type mixture constituting the base layer is generally the same as the open particle size asphalt mixture used for the surface layer of the water-permeable pavement. In the present invention, this pavement open particle size type mixture is laid as a base layer under the aggregate forming the surface layer.

The following effects can be obtained by using an open particle type mixture for paving as a base layer. First, the leveling of the pavement open grain type mixture can be easily laid on the roadbed by manual construction or mechanized construction by an asphalt finisher, as in ordinary pavement.
Moreover, since the mixture of the open particle size type for pavement has water permeability, water from the aggregate as the surface layer can be permeated into the roadbed. An impermeable layer may be provided between the base layer on which the pavement open particle size type mixture is laid and the roadbed, and water from the aggregate serving as the surface layer may be drained into the drainage channel or the gutter.

  Immediately after spreading and leveling the pavement open grain type mixture, contact the surface of the pavement open grain type mixture by compaction after spraying the aggregate on it. The aggregate is bonded and fixed to the surface of the base layer by a paving binder such as asphalt. In order to allow the aggregate to adhere to the pavement binder on the surface of the base layer, the compaction temperature of the pavement open particle size type mixture is desirably in the range of 90 ° C to 175 ° C.

  In the present invention, aggregates dispersed to form a surface layer include river gravel, mountain gravel, sea gravel, various gravel-like aggregates such as natural gravel, crushed stone, and gravel, It is a concept that includes artificial aggregate and sand. Preferably, aggregates to be dispersed are those having a particle size of 1 to 30 mm.

  By dispersing aggregates after forming irregularities on the surface of the leveled mixture for paving, a larger number of aggregates engage with the irregularities formed on the surface of the mixture for paving. As a result, the aggregate is more strongly fixed to the surface of the open particle type mixture for paving.

  Furthermore, by setting the particle size of the open particle type mixture for paving that constitutes the base layer to be larger than the particle size of the aggregate dispersed as the surface layer, the aggregate is locked by the open particle type mixture for paving. In addition, gravel movement is physically prevented.

  That is, as shown in FIG. 1, the base layer surface 1 laid with the pavement open grain type mixture has irregularities as shown, and the mixture 2 also has a large grain size, so the base layer surface 1 is naturally irregular. It is formed. The aggregate 3 laid thereon is bonded with a pavement binding material such as asphalt on the surface 1 of the base layer, and the particle size of the aggregate 3 is smaller than the particle size of the mixture 2. 2 engages with the irregularities formed on the surface 1 of the base layer and is fixed more firmly.

  The size and spacing of the irregularities formed on the base layer surface 1 can be appropriately selected depending on the particle size of the open-graded type mixture and the particle size of the aggregate. For example, the interval between the recesses (the distance between the centers of adjacent recesses) ) Is 10 to 100 mm, and the depth of the uneven portion (difference between peaks and valleys) is 1 to 30 mm.

And as a method of forming irregularities on the surface of the open grain type mixture for pavement, for example, an object (tine) in which iron bars having a diameter of 3 to 20 mm are arranged in a rake shape at intervals of 30 to 100 mm is used. A groove having a depth of 1 to 30 mm is formed by scratching the surface of the open particle type mixture. For example, the tine is attached to the rear of the screed of the asphalt finisher, and the height of the spread mixture is adjusted with the screed, and then the surface is scratched with the tine to form a groove-like recess.
In addition, the method of forming irregularities on the surface of the pavement open grain type mixture is not limited to the method using such tines, and even if the concaves and convexes are formed continuously without forming the concaves in a groove shape. Good.

  Moreover, the particle size of the open particle size type mixture is 5 to 30 mm. And, for example, if the particle size of the aggregate is 1 to 5 mm, the particle size of the open particle type mixture is 5 to 13 mm, and if the particle size of the aggregate is 5 to 13 mm, the particle size of the open particle type mixture is When the particle size of the aggregate is 13 to 30 mm, the particle size of the open particle type mixture is set to 30 mm. That is, it is only necessary that the particle size of the open particle size type mixture is larger than the particle size of the aggregate. It should be noted that the aggregate particle size and the open particle size type mixture particle size are only required to be within the above-mentioned range, and some of them may be included outside the range.

More specifically, when the particle size of the open particle type mixture for pavement is 20 mm, the particle size of the aggregate may be smaller than this, for example, a particle corresponding to No. 6 crushed stone (particle size range: 5 to 13 mm) It is desirable to use one having a diameter.
Moreover, when the particle size of the open particle size type mixture for pavement is 13 mm, the particle size of the aggregate should be smaller than this, but for example, the particle size corresponding to No. 7 crushed stone (particle size range: 2.5 to 5 mm) It is desirable to use what you have.

  Moreover, it is desirable that the aggregate to be sprayed is clean and does not contain foreign substances such as organic substances. For example, a product once heated to a high temperature and dried in an asphalt plant or the like is used.

The thickness of laying the mixture of open grain type for paving depends on the use of the laying site, the strength of the roadbed and the maximum mixture particle size, but when assuming a load of about walking and cycling, 40mm-60mm It only has to be about. Moreover, although the thickness of a surface layer changes with the uses of a laying location, and the particle size of an aggregate, usually the quantity of 10 kg-30 kg / m < ² > is laid.

It should be noted that the aggregate can be sprayed all at once and compacted once, or the aggregate spray can be divided into several times and compacted each time. Good. When divided into several times, the bonding material for paving such as asphalt does not ooze out on the aggregate surface, and when the same amount of aggregate is laid, the surface finish can be made clean. Further, the amount of the aggregate fixed to the base layer surface may be 5 kg / m ² or more.

Next, examples of the gravel pavement and its construction method according to the present invention will be described below.
In the following examples, examples of mechanized construction using asphalt finishers, chip spreaders, tandem rollers, and tire rollers will be described, but in the case of small-scale construction or construction in narrow places where machines are difficult to introduce It is also possible to use manual construction. Moreover, although the example which uses crushed stone was shown as an aggregate disperse | distributed as a surface layer, as mentioned above, various aggregates can be used as an aggregate to disperse.
The roadbed and roadbed are the same as ordinary pedestrian road pavements, but special maintenance may not be required depending on the construction site. In the following examples, the construction of the roadbed and the roadbed will not be described, but the construction is performed by a conventional method.

On the roadbed, a pavement open particle size mixture (straight asphalt 60/80, porosity 20%) with a mixture particle size of 20 mm serving as a base layer was spread by an asphalt finisher to a thickness of 50 mm. Then, No. 6 decorative crushed stone was sprayed thereon with a chip spreader at a rate of 10 kg / m ² . Next, the tandem roller (7 t) was pressed three times and compacted.
In the completed gravel pavement, decorative crushed stone was adhered to the base layer by asphalt, and the base layer was not visible from the surface of the decorative crushed stone, and the base layer was completely covered by the decorative crushed stone.

On the gravel pavement surface of Example 1, No. 6 decorative crushed stone was further sprayed with a chip spreader at a rate of 10 kg / m ² . Next, the tire roller (15t) was pressed for 7 rotations and compacted.
When walking on the completed gravel pavement, there was no dent due to the footprints, and no crushed stone was offset by the treads of the shoes. Moreover, when the bicycle was run, there was no digging due to tire passage.
In addition, when calculating back from the result of removing the crushed stone not fixed to the base layer from the gravel pavement and weighing it, the crushed stone fixed to the base layer surface was 5.95 kg / m ² .

On the roadbed, a pavement open particle size mixture (straight asphalt 60/80, porosity 20%) with a mixture particle size of 20 mm serving as a base layer was spread by an asphalt finisher to a thickness of 50 mm. Next, the surface of the base layer was scratched with a rake-like tine on which iron pins with a diameter of 12 mm were attached at intervals of 60 mm, and a groove with a depth of 15 mm was formed on the leveled base layer surface. Then, No. 6 decorative crushed stone was sprayed on it with a chip spreader at a rate of 20 kg / m ² . Next, the tandem roller (7 t) was pressed 10 times and compacted.
In the completed gravel pavement, decorative crushed stone was adhered to the base layer by asphalt, and the base layer was not visible from the surface of the decorative crushed stone, and the base layer was completely covered by the decorative crushed stone.
In addition, when walking on the completed gravel pavement, there was no dent due to footprints, and no crushed stone was offset by the treads of the shoes. Moreover, when the bicycle was run, there was no digging due to tire passage.
In addition, when calculating back from the result of measuring by removing the crushed stone not fixed to the base layer from the gravel pavement surface, the crushed stone fixed to the surface of the base layer was 12.4 kg / m ² .

On the roadbed, a pavement open particle size mixture (straight asphalt 60/80, porosity 20%) with a mixture particle size of 20 mm serving as a base layer was spread by an asphalt finisher to a thickness of 50 mm. Next, the surface of the base layer was scratched with a rake-like tine on which iron pins with a diameter of 12 mm were attached at intervals of 60 mm, and a groove with a depth of 15 mm was formed on the leveled base layer surface. Then, No. 6 decorative crushed stone was sprayed thereon with a chip spreader at a rate of 10 kg / m ² . Next, the tandem roller (7t) was pressed 7 times and compacted. Further, No. 6 decorative crushed stone was sprayed with a chip spreader at a rate of 10 kg / m ² . Next, the tire roller (15t) was pressed and compressed three times.
In the completed gravel pavement, decorative crushed stone was adhered to the base layer by asphalt, and the base layer was not visible from the surface of the decorative crushed stone, and the base layer was completely covered by the decorative crushed stone.
In addition, when walking on the completed gravel pavement, there was no dent due to footprints, and no crushed stone was offset by the treads of the shoes. Moreover, when the bicycle was run, there was no digging due to tire passage.
In addition, when calculating backward from the result of measuring by removing the crushed stone not fixed to the base layer from the gravel pavement surface, the crushed stone fixed to the surface of the base layer was 9.8 kg / m ² .

On the roadbed, a pavement open particle size mixture (straight asphalt 60/80, porosity 20%) with a mixture particle size of 20 mm serving as a base layer was spread by an asphalt finisher to a thickness of 50 mm. Next, the surface of the base layer was scratched with a rake-like tine on which iron pins with a diameter of 12 mm were attached at intervals of 60 mm, and a groove with a depth of 10 mm was formed on the leveled base layer surface. Then, No. 6 decorative crushed stone was sprayed thereon with a chip spreader at a rate of 10 kg / m ² . Next, the tandem roller (7 t) was pressed three times and compacted. Further, No. 6 decorative crushed stone was sprayed with a chip spreader at a rate of 10 kg / m ² . Next, the tire roller (15t) was pressed for 7 rotations and compacted.
In the completed gravel pavement, decorative crushed stone was adhered to the base layer by asphalt, and the base layer was not visible from the surface of the decorative crushed stone, and the base layer was completely covered by the decorative crushed stone.
In addition, when walking on the completed gravel pavement, there was no dent due to footprints, and no crushed stone was offset by the treads of the shoes. Moreover, when the bicycle was run, there was no digging due to tire passage.
In addition, when calculating back from the result of measuring by removing the crushed stone not fixed to the base layer from the gravel pavement surface, the crushed stone fixed to the surface of the base layer was 7.2 kg / m ² .

On the roadbed, a pavement open particle size type mixture (straight asphalt 60/80, porosity 20%) having a particle size of 13 mm as a base layer was spread by an asphalt finisher to a thickness of 50 mm. Then, No. 7 decorative crushed stone was sprayed thereon with a chip spreader at a rate of 10 kg / m ² . Next, the tandem roller (7 t) was pressed three times and compacted.
In the completed gravel pavement, decorative crushed stone was adhered to the base layer by asphalt, and the base layer was not visible from the surface of the decorative crushed stone, and the base layer was completely covered by the decorative crushed stone.

On the gravel pavement surface of Example 6, No. 7 decorative crushed stone was further sprayed with a chip spreader at a rate of 10 kg / m ² . Next, the tire roller (15t) was pressed for 7 rotations and compacted.
When walking on the completed gravel pavement, there was no dent due to the footprints, and no crushed stone was offset by the treads of the shoes. Moreover, when the bicycle was run, there was no digging due to tire passage.
In addition, when calculating back from the result of measuring by removing the crushed stone not fixed to the base layer from the gravel pavement surface, the crushed stone fixed to the surface of the base layer was 5.3 kg / m ² .

On the roadbed, a pavement open particle size type mixture (straight asphalt 60/80, porosity 20%) with a mixture particle size of 5 mm serving as a base layer was spread with an asphalt finisher to a thickness of 50 mm. Next, the surface of the base layer was scratched with a rake-like tine on which iron pins with a diameter of 12 mm were attached at intervals of 50 mm, and grooves having a depth of 10 mm were formed on the leveled base layer surface. Then, No. 7 decorative crushed stone was sprayed thereon with a chip spreader at a rate of 10 kg / m ² . Next, the tandem roller (7 t) was pressed three times and compacted. Furthermore, No. 7 decorative crushed stone was sprayed at a rate of 10 kg / m ² with a chip spreader. Next, the tire roller (15t) was pressed for 7 rotations and compacted.
In the completed gravel pavement, decorative crushed stone was adhered to the base layer by asphalt, and the base layer was not visible from the surface of the decorative crushed stone, and the base layer was completely covered by the decorative crushed stone.
In addition, when walking on the completed gravel pavement, there was no dent due to footprints, and no crushed stone was offset by the treads of the shoes. Moreover, when the bicycle was run, there was no digging due to tire passage.
In addition, when calculating back from the result of measuring by removing the crushed stone not fixed to the base layer from the gravel pavement surface, the crushed stone fixed to the surface of the base layer was 5.2 kg / m ² .

  The present invention can be applied to both human construction and mechanized construction, and is not limited to walking paths in parks, shrines, temple precincts, and approach roads. .

1 Surface of base layer 2 Mixture 3 Aggregate

Claims (3)

  Immediately after laying and leveling the open particle type mixture for paving, irregularities are formed on the surface of the mixture, and then the aggregate is sprinkled on the surface of the mixture on which the irregularities have been formed, and then the bone is removed from the surface of the aggregate with a compacting machine. A method for constructing a gravel pavement, wherein the material and the mixture are simultaneously compacted, and the aggregate is fixed to the uneven portion of the mixture.   The construction method of the gravel pavement according to claim 1, wherein the particle size of the mixture of the open particle size type for pavement is made larger than the particle size of the aggregate to be dispersed.   A surface layer in which aggregate is dispersed is laid on a base layer made of an open particle size type mixture for paving, and the aggregate in contact with the surface of the base layer of the surface layer is bonded to the base layer by a bonding agent for paving, and A gravel pavement characterized in that the particle size of the open particle type mixture for paving is larger than the particle size of the aggregate.

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