JP5944284B2 - Paved area, paving method - Google Patents

Description

  The present invention relates to a pavement, and more particularly to a pavement with improved wastewater treatment. The present invention also relates to a pavement method for improving drainage performance.

  In the current power supply and demand system, the power generated at a remote power station is boosted at an ultra-high voltage substation and then sent to a secondary substation via a transmission line. In general, the voltage is stepped down to a predetermined voltage at a substation and then distributed to consumers via a distribution network. Transmission lines are supported by steel towers arranged in a distributed manner, and the steel tower is one of the constructions indispensable for delivering power to consumers.

  Many steel towers are built in areas where houses are not so dense, such as in the mountains. However, there are cases where it is unavoidable to be built near a substation or near a densely populated area due to other circumstances. In such a case, since a very high voltage flow is generated on the transmission line supported by the steel tower, measures such as fences are taken so that only workers can enter the site. ing.

  The tower site may occupy an area from one hundred to several hundred square meters in consideration of the necessity of supporting a high steel tower and safety. Such a large site is surrounded by a fence and usually no one can enter.

  In many cases, steel tower sites such as mountainous areas are composed of soil, whereas in steel tower sites provided near residential densely populated areas, it may be difficult to construct with soil. This is because workers rarely enter the tower site during normal times, and if the site is realized with soil, weeds and other plants grow over the area, causing aesthetic problems and bugs in this plant. This is because a lot of birds aim at this insect and problems such as fecal damage occur.

  Under such circumstances, when a steel tower site made of soil is set up near a densely populated area, complaints from neighboring residents may come. For this reason, in such a place, the present situation is that the steel tower site is realized exclusively by the concrete pavement.

  However, when the site is realized on concrete pavement, the drainage capacity is low unlike soil. If the site does not have drainage performance, the rainwater collected in the site after the rain cannot be discharged, and the accumulated state of water will continue. Especially in rainy seasons such as the rainy season and typhoon, it takes a considerable number of days for water to be drawn completely just by waiting for natural evaporation. This results in aesthetic issues and safety concerns, especially on sites in the vicinity of densely populated houses.

  For this reason, when the steel tower site is a concrete pavement, a certain slope is provided to the drainage channel outside the site, and if the drainage channel is located at a distance from the site, PVC pipes, etc. By installing the system, it is possible to automatically drain rainwater that has poured into the site into the drainage channel.

  However, when there is no appropriate drainage channel in the vicinity of the steel tower site, the above method cannot be adopted. Especially in the vicinity of densely populated houses, there are often cases where there is no appropriate drainage channel nearby. Under such circumstances, in recent years, permeable concrete pavement may be adopted for steel tower sites.

  The permeable concrete is formed by aggregating an aggregate having a particle size of several mm to several tens of mm by a predetermined method, and allowing water to permeate through voids formed between the aggregates. It is possible concrete material. By applying such permeable concrete pavement to the steel tower site, rainwater that has poured into the site penetrates naturally into the ground through the permeable concrete, so that a puddle is continuously formed in the site. Can be prevented.

  In addition, the following patent document 1 has a disclosure regarding a permeable concrete pavement.

  By the way, as described above, the water-permeable concrete has a structure in which water permeates through the gaps between the aggregates. Therefore, the existence of the gaps is important in order to maintain the water permeability. However, on the other hand, such permeable concrete is used on the site and is usually exposed to the outside, so that dust and dirt adhere and accumulate with age. When this dust or dust adheres to and accumulates on the site for a certain period of time, the gap between aggregates may be filled with dust or dust. When such a situation is caused, the water permeation performance is lowered. As a result, there is a possibility that a puddle may be continuously formed in the steel tower site in the same manner as ordinary concrete pavement is provided.

  Patent Document 2 discloses a method for maintaining the water permeability of water-permeable concrete. Specifically, a truck equipped with a compressor and high-pressure water pump is transported to the site of the target permeable concrete site, and high-pressure air is injected from the compressor and high-pressure water is injected from the high-pressure water pump to the surface of the site. In this way, the surface of the site is cleaned, and thereby dust and dirt that adhere to and accumulate on the permeable concrete are discharged.

Japanese Patent No. 4856922 Japanese Patent No. 3228715

  As described above, in order to use the method described in Patent Document 2, it is necessary to bring a large vehicle equipped with large facilities such as a compressor and a high-pressure water pump to the site. However, in the vicinity of densely populated houses, there are cases where the target tower site cannot be reached without passing through such a narrow alley where large vehicles cannot enter.

  Even if a large vehicle can arrive at the site, it is necessary to stop the large vehicle around the site until the work is completed, which may interfere with the traffic of neighboring residents and cars. is there. Furthermore, field work using a compressor or high-pressure water pump may be accompanied by loud noise during the work. Because of these circumstances, complaints from neighboring residents may come to the work.

  In view of such a problem, an object of the present invention is to realize a pavement and a pavement method capable of maintaining water-permeable performance without bringing a large vehicle or a large facility to the site.

The pavement of the present invention is
The roadbed layer formed on the upper layer of the ground,
A concrete layer formed as an upper layer of the roadbed layer;
A plurality of water permeable concrete members embedded at least completely through the concrete layer,
The water permeable concrete member is:
It is embedded by being inserted into an opening hole having a diameter equal to or larger than the diameter of the water-permeable concrete member and penetrating completely through the concrete layer, and is taken out from the opening hole to the inside of the opening hole. It is characterized in that it can be reinserted.

  In the pavement according to the present invention, a plurality of water-permeable concrete members are embedded in a concrete layer, and these can be taken out to the outside and reinserted into the inside. This water-permeable concrete member is embedded at least completely through the concrete layer. For this reason, the rainwater poured upon raining permeates into the roadbed layer and the ground through the plurality of buried permeable concrete members. Thus, a puddle is not continuously formed on the upper surface of the pavement after rain.

  Similarly to the permeable concrete pavement, the permeable concrete member may realize water permeability by allowing water to permeate through the gaps between the aggregates. In this case, as described above in the section of the background art, in the permeable concrete member, it is conceivable that dust and dirt adhere and accumulate with the passage of time and the water permeability performance deteriorates. However, in such a case, by taking out the water-permeable concrete member to the outside, re-inserting and embedding a new water-permeable concrete member (that is, high water-permeable performance) in the opening hole formed in the place after the removal, Water permeability can be restored easily. Moreover, since dust and dirt adhere and accumulate mainly near the upper surface of the water-permeable concrete member, the water-permeable performance can also be restored by reversing the taken-out water-permeable concrete member upside down.

  Therefore, according to this configuration, it is sufficient to transport a plurality of water-permeable concrete members for replacement to the site at least, and it is possible to go to the site with a small vehicle. In addition, it is possible to recover the water permeation performance simply by taking out the water permeable concrete member that has already been buried, reversing it upside down, and refilling it. In other words, large facilities such as a compressor and a high-pressure water pump are not required to ensure water permeability, and there is no need to bring a large vehicle equipped with these large facilities to the site. Therefore, the pavement of the present invention can also be used for a steel tower site in the vicinity of a densely populated house. However, the pavement of the present invention is not limited to a steel tower site, and can naturally be used for sites of other uses.

  The pavement having the above configuration can be realized by adding water permeability to an existing concrete pavement, or by performing concrete pavement having water permeability on a new site. In the former case, the concrete pavement is already formed, and in the latter case, once the concrete pavement is formed, the concrete layer is completely penetrated so that the roadbed layer or the upper surface of the ground is exposed. In addition, a plurality of opening holes having a predetermined diameter are formed. Then, it can implement | achieve by embedding the water-permeable concrete member which has a diameter smaller than the diameter of an opening hole in each of the said several opening hole.

  Here, the concrete layer into which the permeable concrete member is inserted may be a permeable concrete pavement layer in addition to a general concrete pavement layer having extremely low water permeability. The roadbed layer may be composed of a crushed stone layer such as a crusheran or a gravel layer with fine particles.

  As described above in the section of the background art, the water-permeable concrete pavement has a higher water-permeability than ordinary concrete pavement, and therefore there is little possibility that a puddle is continuously formed in the site after rain. However, since the water permeation performance deteriorates due to dust or dust, it is necessary to recover the water permeation performance by performing an operation of cleaning the site surface using high-pressure air and high-pressure water as described above. In this case, a large vehicle equipped with a compressor and a high-pressure pump is required. However, if an opening hole is made in this permeable concrete pavement and a plurality of permeable concrete members are inserted in the opening hole, at least the permeable concrete member can be replaced or turned upside down to restore the water permeable performance. Is possible. Therefore, even if it is a case where it is a case where it is set as the aspect which embeds a some water-permeable concrete member in the existing water-permeable concrete pavement, the effect that water-permeable performance can be ensured without using a large sized facility is acquired.

  By the way, although the size of this water-permeable concrete member can be set freely, it is preferable to reduce the size so that it can be taken out / reinserted without using a special large tool.

Further, the pavement of the present invention has a filling member formed so as to fill at least the upper gap close to the ground surface among the gap between the inner surface of the opening hole and the outer surface of the water-permeable concrete member. ,
Another feature is that the filling member is configured to be able to be taken out from the opening hole.

  As described above, in the pavement of the present invention, it is necessary to take out and reinsert the water-permeable concrete member in order to restore the water-permeable performance that decreases with time. For this reason, a water-permeable concrete member is embed | buried in the opening hole more than the diameter of a water-permeable concrete member so that the embedded water-permeable concrete member can be taken out. Therefore, in the embedded state, a gap is formed between the outer side surface of the water-permeable concrete member and the inner side surface of the opening hole.

  This gap may be formed in the sense that it forms a water permeation path, but if a gap larger than a certain size is formed, roots grow in the lower roadbed layer or ground, It is preferable that the gap is narrow to some extent because plants may grow on the surface.

  Therefore, as in the above configuration, the gap between the inner surface of the opening hole and the outer surface of the permeable concrete member is filled with at least the upper gap close to the ground surface with the filling member, so that there is no gap on the ground surface. Is not formed, and the growth of plants in the gap can be prevented. But it is good also as a structure filled with a filling member so that all the clearance gaps may be covered completely.

  Here, the filling member needs to be configured to be able to be taken out from the opening hole. By comprising in this way, when exchanging the permeable concrete member embed | buried (or upside down), an operator takes out the filling member buried in the clearance first outside. Next, the permeable concrete member can be taken out using the gap formed by taking out the filling member.

  In addition, as a filling member, it is possible to use a caulking material, a rubber packing, a PVC pipe, or the like.

Moreover, the pavement of the present invention is
The roadbed layer formed on the upper layer of the ground,
A bottom surface is in contact with the roadbed layer, and a plurality of water permeable concrete members disposed adjacent to each other, embedded in such a manner that the upper surface protrudes from the upper layer of the roadbed layer,
Each of the water-permeable concrete members is configured to be capable of being taken out to the outside and reinserted into a hole-like space formed after taking out.

  The above configuration is particularly useful when performing permeable concrete pavement on a new site. That is, a pavement is formed by laying a plurality of water permeable concrete members adjacent to each other on the upper layer of the roadbed layer so that the bottom surface is in contact with the roadbed layer. Even when constituted in this way, it becomes possible to maintain water permeability for many years by taking out each water-permeable concrete member, exchanging, or reversing it upside down.

  In addition, a water-permeable concrete member is good also as a structure which has the attachment member for hooking a predetermined | prescribed small tool on an upper surface or an outer surface, for example. By comprising in this way, the taking-out operation | work of the embedded water-permeable concrete member is further facilitated. Further, in the configuration in which the filling member is provided, an attachment member for hooking a predetermined small metal fitting may be provided on the upper surface of the filling member. By comprising in this way, the taking-out operation | work of a filling member is facilitated.

  According to the pavement or the pavement method of the present invention, it is possible to maintain the water permeability for many years without bringing large vehicles and large facilities to the site.

It is the top view which showed an example of the pavement of this invention typically. It is sectional drawing which showed typically an example of the pavement of this invention. It is sectional drawing which showed an example of the general concrete pavement typically. It is a typical perspective view which shows an example of a water-permeable concrete member. It is a schematic process drawing which shows the process for forming the pavement of this invention with respect to the site | part by which concrete pavement was carried out. It is a schematic process drawing which shows the process for forming the pavement of this invention with respect to the site | part by which concrete pavement was carried out. It is a schematic process drawing which shows the process for forming the pavement of this invention with respect to the site | part by which concrete pavement was carried out. It is a schematic process drawing which shows the process for forming the pavement of this invention with respect to the site | part by which concrete pavement was carried out. It is the top view which showed typically another example of the pavement of this invention. It is sectional drawing which showed typically another example of the pavement of this invention.

  1A and 1B schematically show an example of a pavement according to the present invention. FIG. 1A corresponds to a top view and FIG. 1B corresponds to a cross-sectional view.

  In this embodiment, the aspect by which the pavement of this invention was given to partial area | region A2 of the site | part 3 in which concrete pavement was carried out is assumed. In this case, the site 3 in the region A2 corresponds to the paved land of the present invention. Below, the site | part of the area | region A2 where the pavement of this invention was given is suitably called "paved ground 1".

  FIG. 1B is a schematic cross-sectional view of the pavement 1. In the pavement 1, a roadbed layer 12 is formed on the upper layer of the ground 11, and a concrete layer 13 is further formed on the upper layer of the roadbed layer 12. The plurality of water permeable concrete members 10 penetrate the concrete layer 13 and the roadbed layer 12 and reach the ground 11. For comparison, FIG. 1C shows a schematic cross-sectional view of the site 3 in the region A1.

  FIG. 1D is a schematic perspective view showing an example of the water permeable concrete member 10. The water-permeable concrete member 10 is formed by molding water-permeable concrete formed by collecting aggregates having a large particle size into a predetermined shape. As an example, a cylindrical shape having a diameter of 10 cm and a height of 20 cm can be used, but the shape and dimensions are not limited thereto. However, as will be described later, since this permeable concrete member 10 is scheduled to be taken out and re-embedded (re-inserted) outside, the permeate concrete member 10 is provided so that the work can be easily taken out / buried by the worker. It is preferable that the water permeable concrete member 10 is made as small and light as possible within a range in which water permeability can be secured.

Although the water-permeable concrete member 10 depends on a material and a manufacturing method, for example, it is possible to realize a configuration having water retention of about 1/4 of the volume. In such a configuration, when the diameter is 10 cm and the height is 20 cm, about 400 cm ³ of water can be stored at a time.

  A part of the rainwater that has poured onto the pavement 1 is stored in the permeable concrete member 10 and permeates into the ground 11 and the roadbed layer 12 through the permeable concrete member 10. For this reason, for example, after raining, a puddle is not continuously formed on the upper surface of the pavement 1. In FIG. 1B, the penetration direction of water is indicated by an arrow.

  In addition, in the configuration of FIG. 1A, it is preferable that an inclination from the region A1 toward the region A2 is provided. Since normal concrete pavement is performed in the area A1 (FIG. 1C), the rainwater that has poured onto the upper surface hardly penetrates into the ground 11 and water is stored on the upper surface of the site. However, by providing such an inclination as described above, the stored water naturally flows out from the region A1 toward A2. Then, when the water that has flowed out reaches the site 3 in the region A2, that is, the pavement 1, it penetrates into the ground 11 through a plurality of water-permeable concrete members 10 embedded in the pavement 1. Accordingly, it is possible to improve drainage not only in the area A2 where the pavement 1 is formed but also in the area A1 made of ordinary concrete pavement. In addition, in FIG. 1A, the moving direction of water is represented by the arrow in area | region A1.

  As described above, the pavement 1 is not provided on the entire surface of the site 3, but the pavement 1 is partially provided, so that the water permeability of the entire site 3 can be secured while suppressing the pavement cost. It becomes. Of course, the same pavement as the pavement 1 may be performed on the entire surface of the site 3. In this case, it is not always necessary to provide an inclination from the region A1 toward the region A2.

  2A to 2D are schematic process diagrams showing a process for forming the pavement 1 with respect to the site 3 on which concrete pavement is performed. First, as shown in FIG. 2A, an opening 20 having a predetermined diameter D1 is formed in the concrete layer 13, and the upper surface of the roadbed layer 12 is exposed. Then, as shown in FIG. 2B, the roadbed material of the roadbed layer 12 located on the bottom surface of the opening hole 20 is continuously taken out to expose the upper surface of the ground 11. And as shown to FIG. 2C, the water-permeable concrete member 10 is embed | buried in each formed opening hole 20. As shown in FIG.

  Here, the diameter D1 of the opening hole 20 is not less than the diameter D2 of the water-permeable concrete member 10 to be embedded. At this time, the permeable concrete member 10 can be embedded in the opening hole 20.

  When there is a certain amount of divergence between the diameter D1 of the opening hole 20 and the diameter D2 of the permeable concrete member 10, a gap having a dimension corresponding to the divergence is formed between the outer surface of the permeable concrete member 10 and the inner surface of the opening hole 20. Will be formed. Therefore, as shown in FIG. 2D, the gap is filled with a filling member formed of a caulking material, rubber packing, a PVC pipe, or the like. In addition, (a), (b), and (c) of FIG. 2D show the aspect filled with the different filling method for description, respectively, (d) is the aspect which does not perform filling with a filling member. Is shown for comparison.

  FIG. 2D (a) illustrates a mode in which the position close to the ground surface, that is, the upper gap is filled with the caulking agent 41. FIG. 2D (b) illustrates an aspect in which the entire surface of the gap is filled with the rubber packing 42. FIG. 2D (c) shows a mode in which the gap on the upper side is filled with the PVC pipe 43. Both are realized by filling the gap with a substantially cylindrical filling member 40.

  Since foreign matters are mixed into the gap from above, if at least the upper side close to the ground surface is filled with the filling member 40, an effect of preventing foreign matters can be expected. Of course, as shown in (b), the entire surface of the gap may be filled with a filling member 40 (here, rubber packing 42). However, as will be described later, when the permeable concrete member 10 is exchanged or turned upside down, the filling member 40 needs to be first taken out to the outside. It is preferable to fill the filling member 40 only in the gap on the upper side close to. In addition, in (b), a mode in which only the rubber packing 42 is filled with the entire gap is illustrated, but the rubber packing 42 as a filling member may naturally be filled only in the upper gap. Similarly, the caulking agent 41 and the PVC pipe 43 may be filled in the entire surface of the gap.

  However, if a remarkably wide gap is not formed, as shown in FIG. 2D (d), pavement may be completed with the gap left. Originally, when this gap exists, a path for water flowing into the ground 11 through the gap is formed, which is effective in improving drainage.

  Next, the maintenance for the deterioration of the water permeability performance with the passage of time will be described.

  As described above, in the case of ordinary water-permeable concrete coating, dust or dust adheres and accumulates in the gaps between aggregates over time, filling the gaps, thereby reducing the water permeability. The same phenomenon occurs also in the water-permeable concrete member 10 in the pavement 1.

  However, in the pavement 1, the permeable concrete member 10 is embedded in the opening hole 20 and can be taken out / re-embedded. For this reason, when the water permeation performance of the water permeable concrete member 10 is deteriorated over time, the water permeable concrete member 10 may be replaced with a new one. Thereby, the water-permeable concrete member 10 in which dust or dust does not adhere and accumulate in the gaps between the aggregates is buried, and the water-permeable performance can be improved again.

  When the permeable concrete member 10 is replaced, if the filling member 40 is not filled as shown in FIG. 2D (d), the permeable concrete member 10 is simply taken out from the opening hole 20 and is replaced with a new (water permeable concrete member). What is necessary is just to embed the water-permeable concrete member 10 (high performance) again. At this time, the permeable concrete member 10 can be taken out by inserting a worker's hand or a small tool into the gap using the gap between the permeable concrete member 10 and the opening hole 20. In order to simplify the take-out operation, it is also preferable to provide an attachment member (not shown) on the upper surface or the outer surface of the water-permeable concrete member 10 in order to hook a predetermined small tool (the tip). is there. In this case, the water-permeable concrete member 10 can be easily taken out by hooking a small tool on the mounting member and pulling the small tool.

  2D (a) to (c), when the filling member 40 is filled, after the filling member 40 is first taken out to the outside, there is a gap at the place where the filling member 40 was originally filled. Since it is formed, the permeable concrete member 10 may be taken out by the same method as in FIG. 2D (d), for example, using this gap. Note that a mounting member for hooking a small tool or the like on the upper surface of the filling member 40 may be provided.

  In addition to exchanging with a new water-permeable concrete member 10, the water-permeable performance can be recovered by taking out the buried water-permeable concrete member 10 once and then reversing it upside down. is there. This is because dust or dirt adheres and accumulates on the upper surface side of the exposed permeable concrete member 10, and the water permeability performance is still high on the bottom surface side.

  As explained above, according to the pavement 1 of the present invention, the buried permeable concrete member 10 is taken out and replaced with a new one, or re-embedded, or upside down and re-buried. It is possible to recover the deterioration of water permeability due to aging. Therefore, unlike the conventional water-permeable concrete pavement, large facilities such as a compressor and a high-pressure water pump are not required, and it is not necessary to bring a large vehicle equipped with these large facilities to the site.

[Another embodiment]
Hereinafter, another embodiment will be described.

  <1> FIGS. 3A and 3B schematically show an example of a pavement according to another embodiment. FIG. 3A corresponds to a top view and FIG. 3B corresponds to a cross-sectional view. In FIG. 3A, it is assumed that a newly formed pavement 1A is formed adjacent to the existing concrete pavement 3A. A pavement 1A shown in FIGS. 3A and 3B is configured by forming a plurality of rectangular column-shaped permeable concrete members 10 adjacent to each other after a roadbed layer 12 is formed on an upper layer of the ground 11. .

  The permeable concrete member 10 is embedded in such a manner that the bottom surface comes into contact with the roadbed layer 12 and the upper surface protrudes above the roadbed layer 12 and is exposed to the ground surface. That is, the paved ground 1A is formed by arranging a plurality of water-permeable concrete members 10 on the upper surface of the roadbed layer 12 and laying them adjacent to each other. Even when configured in this manner, each permeable concrete member 10 is taken out, replaced with a new one having high water permeability, or upside down, and re-embedded (reinserted) into a hole-like space formed after taking out. Thus, it is possible to maintain the water permeability performance for many years.

  Even in this case, for the same reason as in FIG. 1A, it is preferable to provide an inclination from the concrete pavement 3A toward the pavement 1A.

  3A and 3B, the pavement 1A is formed adjacent to the existing concrete pavement 3A, but the entire site may be realized as the pavement 1A.

  <2> In the above embodiment, the permeable concrete member 10 completely penetrates the roadbed layer 12 and the concrete layer 13 and the bottom surface reaches the ground 11. However, the water-permeable concrete member 10 only needs to completely penetrate at least the concrete layer 13, that is, may be embedded with the bottom surface in contact with the roadbed layer 12. Even if it is such a structure, since water can be osmose | permeated to the roadbed layer 12 or the ground 11 through the water-permeable concrete member 10, water permeability is implement | achieved.

  <3> In the above embodiment, the configuration in which the paved ground 1 is realized by providing an opening hole and embedding the permeable concrete member 10 in the site 3 on which the concrete paving is performed has been described. However, the pavement 1 may be realized by providing an opening hole and burying the permeable concrete member 10 even on a site where the permeable concrete is already paved.

DESCRIPTION OF SYMBOLS 1,1A: Pavement of this invention 3: Site 3A: Concrete pavement 10: Permeable concrete member 11: Ground 12: Roadbed layer 13: Concrete layer 20: Open hole 40: Filling member 41: Caulking agent 42: Rubber packing 43: PVC pipe A1: Area where normal concrete pavement was made A2: Area where pavement of the present invention was made D1: Diameter of opening hole D2: Diameter of permeable concrete member

Claims (5)

It is a pavement site in the steel tower site,
The roadbed layer formed on the upper layer of the ground,
A concrete layer formed as an upper layer of the roadbed layer;
A plurality of water permeable concrete members embedded at least completely through the concrete layer,
The water permeable concrete member is:
It is embedded by being inserted into an opening hole having a diameter equal to or larger than the diameter of the water-permeable concrete member and penetrating completely through the concrete layer, and is taken out from the opening hole to the inside of the opening hole. It is configured for reinsertion,
A pavement characterized in that the permeable concrete member is embedded in all the opening holes . Among the gaps between the inner side surface of the opening hole and the outer side surface of the water-permeable concrete member, it has a filling member formed so as to fill at least the upper side gap close to the ground surface,
The pavement according to claim 1, wherein the filling member is configured to be able to be taken out from the opening hole. A pavement method for a pavement provided in a steel tower site , wherein a roadbed layer is formed on the ground layer, and a concrete layer is formed on the top layer of the roadbed layer,
A step (A) of forming a plurality of opening holes with a predetermined diameter so that at least the concrete layer completely penetrates and the upper surface of the roadbed layer or the ground is exposed;
A pavement method comprising a step (B) of embedding a water-permeable concrete member having an inner diameter smaller than the predetermined diameter in each of the plurality of opening holes.   4. The method according to claim 3, further comprising a step (C) of filling a filling member into a gap between an inner side surface of the opening hole and an outer side surface of at least an upper portion of the water-permeable concrete member after the step (B). Paving method. 5. The pavement method according to claim 3, further comprising a step (D) of taking out the water-permeable concrete member embedded in the opening hole, reversing upside down and re-embeding in the opening hole.

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