JP2009268421A - Greened pavement and method for constructing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a greened pavement being a technique regarding a greened pavement in an area such as a driving path or a parking place which vehicles enter, increasing the ratio of green area while maintaining load-resistant capacity, allowing plants to soundly grow and keeping the plants in sound conditions for a long period of time, and to provide a method for constructing the greened pavement. <P>SOLUTION: The greened pavement includes the following structure: a tread pressure-preventive material is laid on the upper side of a water-holding road base formed by agitating and mixing road base material and water-holding material containing anion adsorbing carbon material, and evenly laying the mixture on the upper side of a road bed and roll-pressing the mixture; vegetation base material including a plant growth-promoting agent containing microorganisms belonging to Staphylococcus or Brevibacterium, and/or the anion adsorptive carbon material is filled in a space protected by the tread pressure-preventive material; and plants are arranged on the upper side of the vegetation base material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for greening pavement in an area such as a traveling road or a parking lot where a vehicle enters.

  As an alternative to conventional high-strength pavement that used asphalt and concrete such as pavement for vehicles, there is a greening pavement that can actively grow vegetation such as turf in the pavement part. It is necessary to prevent plants that grow on the pavement from being stepped on and killed in the greening roads and parking lots that have been applied, while preventing the vehicle from running or stopping on the pavement. There is. For this reason, when pavement greening is performed, it is important that the pavement has a soft ground where plants can grow and a strong ground that can withstand the load of vehicles, etc. It must be resolved at the same time.

  Therefore, as a conventional greening pavement, as described in Patent Document 1, there is a greening pavement using a high-strength block as a tread pressure prevention material. This is to protect the plant from treading by placing a vegetation base and a block on the roadbed and receiving the vehicle load.

JP-A-7-150505

  However, the greening pavement of Patent Document 1 has a problem that the greening area is reduced by the increase in the area occupied by the tread pressure prevention material.

  In addition, since a thin layer of vegetation base is created on the crushed stone roadbed, there is a risk of drought damage and growth damage due to great stress on the plant such as loss of nutrients and lack of water. It was.

  The present invention was made in view of the above problems, and increased the ratio of the greening area while maintaining the load bearing performance, and further allowed the plant to grow healthy and maintain its state for a long period of time. The purpose is to provide a greening pavement and its construction method.

  In order to solve the above-mentioned problems, technical measures taken by the present invention are as follows. That is, the greening pavement of the invention according to claim 1 is formed by stirring and mixing a roadbed material and a water-retaining material containing an anion-adsorbing carbon material, laying it on the upper side of the roadbed, and rolling and then rolling it. In the space protected by the pedaling pressure preventive material on the upper side of the roadbed, a plant growth promoter and / or anion adsorbing carbon material containing microorganisms belonging to the genus Staphylococcus or Brevibacterium is placed. The vegetation base material is filled, and a plant is further provided on the upper side of the vegetation base material.

  The construction method of the greening pavement of the invention which concerns on Claim 2 stirs and mixes the roadbed material and the water-retaining material containing the anion adsorption carbon material, spreads it on the upper side of the roadbed, and then rolls the water-retaining roadbed. A step of forming, and a plant growth promoter containing a microorganism belonging to the genus Staphylococcus or Brevibacterium in a space protected by the tread pressure preventive material and laying a tread pressure preventive material on the upper side of the water retaining roadbed and / or Alternatively, the method is characterized by comprising a step of forming a plant growth layer by filling a vegetation base material containing an anion adsorbing carbon material and a step of arranging a plant above the plant growth layer.

  By the invention which concerns on Claims 1-2, the greening pavement which can raise a greening area ratio, maintain a load-bearing performance, and also grow a plant healthy, and can maintain the state for a long period of time, and its construction method Is obtained.

  That is, in the invention according to claim 1, the load (mainly vertical downward load) applied to the top of the tread pressure preventing material is transmitted to the water retention roadbed after being distributed over the area of the lower surface area of the tread pressure preventing material. The Therefore, since the force applied per unit area of the water retaining roadbed is very small, a greening pavement capable of withstanding a larger load can be obtained.

  Furthermore, it is possible to create a space where no load is applied between the upper surface of the tread pressure prevention material and the water retaining roadbed, and a greening part (vegetation base material or plants that grow from the vegetation base material) in this space. If it arrange | positions, a greening part can be protected from the treading pressure etc. by a vehicle, and the growth of a plant can be aimed at favorably and reliably.

  In addition, the plant can extend its roots not only to the layer of plant base material but also to the layer of water retaining roadbed below it, so that it can firmly root the plant and realize stable greening over a long period of time. Is possible.

  In addition, when using an approximately sword mountain-shaped protrusion pressure-preventing material, conventionally, it has been necessary to provide a sufficient amount of a plant-growing layer in order to avoid drought damage to the plant. As a result, the load bearing strength of the stepping pressure preventive material may be reduced. However, in the present invention, since the plant can grow on the roadbed, the protrusion height is higher than that of the conventional stepping pressure preventing material. Can be set low to increase the load bearing strength.

  On the other hand, in the invention which concerns on Claim 2, the greening pavement which exhibits the effect mentioned above reliably can be constructed easily.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, FIG. 1 is a sectional view schematically showing a configuration of a greening pavement and a construction method thereof according to an embodiment of the present invention, and FIG. 2 schematically shows a situation when a vehicle passes on the greening pavement. It is explanatory drawing.

  As shown in FIG. 1, the greening pavement in the present embodiment includes a water retention roadbed 2 formed on the upper side of the ground (roadbed) 1 in the construction target area, and a non-land correction layer formed on the water retention roadbed 2. 5, a substantially sword-shaped projecting tread pressure-preventing material 6 laid on the unevenness correcting layer 5, and a vegetation base material 7 filled in a space protected by the tread-pressure preventing material 6.

  Hereinafter, the construction method of the greening pavement according to the present embodiment will be described together with description of the detailed configuration of the greening pavement. The construction method of the greening pavement includes the following steps (1) to (5).

  (1) First, in forming the water retaining roadbed 2, for example, the ground surface of the construction target area is dug down (or a wall is formed around the construction target area) to provide a space for greening pavement formation, Perform 1 shaping and rolling.

  (2) Next, the roadbed material 3 (crushed stone in the present embodiment) and the water retaining material 4 are stirred and mixed, and the stirred material is laid on the roadbed 1 to a predetermined thickness (for example, about 10 to 30 cm), and loaded. Roll with a rolling machine such as a roller, tire roller, or vibration compactor.

  The roadbed material 3 is a hard granule having a particle size of 10 to 100 mm (preferably 30 to 50 mm). For example, in addition to crushed stone and gravel (ballast), the roadbed material 3 maintains a certain strength (the state of the roadbed 2 after construction). It is also possible to use slag or other iron ore as long as it has strength.

  As the water retaining material 4, peat moss, bark compost, fertile soil, perlite, vermiculite, bentonite, or a mixture thereof can be used. In addition, the water retaining material 4 may contain a soil improvement material, a fertilizer, a plant growth promoter, and the like. In particular, when an anion adsorbing carbon material is contained, a fertilizer such as nitrate ion that is going to run away with moisture is contained. It is suitable because it can be adsorbed and used for plant growth.

  Although it is this rolling process, in order to form the water-retaining roadbed 2 with the surface as horizontal as possible, it is preferable to perform rolling while watering. Moreover, the fluidity of the water retaining material 4 is improved by this watering, and the water retaining material 4 is further filled into the gaps between the roadbed materials 3. In addition, if necessary, fine sand may be thrown over and spread, and the unevenness correction layer 5 may be formed to make the surface more level.

  (3) After that, the substantially sword mountain-like stepped pressure-preventing material 6 is laid on the water-retaining roadbed 2. As shown in FIG. 2, the tread pressure prevention material 6 is made of resin, and includes a plurality of protrusions extending upward and having a uniform height and a flat tip, and holes through which the roots of plants can be inserted. Is sufficiently small compared to the width of the tire 9, and the tire 9 of the vehicle passing through the green pavement area is always grounded at the upper end of each protrusion, so that the tire 9 does not reach the plant growth point. In this way, the protrusion is sufficiently long. The size is a substantially square of 50 cm square, and a connecting portion for connecting adjacent tread pressure preventing materials 6 is formed on each side. In addition, a raw material is not limited to this, The material (metal, such as steel) which has fixed intensity | strength and does not deform | transform or corrode can be selected.

  (4) After that, the vegetation base material 7 is overlaid and leveled from above the tread pressure prevention material 6, and the plant growth layer is formed by filling the space protected by the tread pressure prevention material with the vegetation base material 7. In this embodiment, the height of the vegetation base material 7 to be filled is approximately the same as the height of the protrusion of the tread pressure preventing material 6 in order to perform the lawn mat laying and rolling process as described later. It is possible to make it lower.

  (5) Finally, a vegetation mat 8 (mat-like raw turf in this embodiment) is laid on the plant growing layer, and the vibration roller so that the projection top of the tread pressure prevention material 6 penetrates onto the vegetation mat 8. Compress it using a method such as

  Thus, the plant growth point can be disposed below the surface of the tread pressure preventing material 6 by projecting the top of the protrusion of the tread pressure preventing material 6 onto the plant, and the plant is reliably protected by this process. It is possible to do.

  Furthermore, this rolling pressure can surely bring the plant into close contact with the vegetation base material 7, which leads to prevention of drying troubles due to the floating of the plant (in a state where it is not in close contact).

  The vegetation base material 7 may be a mixture of peat moss, bark compost, high quality soil, water retention material, soil improvement material, and the like. It is also possible to include plant seeds in the vegetation base material 7.

  In addition, the vegetation base material 7 includes either a plant growth promoter containing a microorganism belonging to the genus Staphylococcus or Brevibacterium, and an anion adsorbing carbon material that adsorbs nitrate ions, more preferably both. It is desirable to add a plant to grow plants healthy under special conditions that are easy to dry, such as green pavement.

  In order to derive an appropriate blending condition of the vegetation base material 7, the applicant conducted the following test.

  Prepare a test specimen in which a 200mm thick water-retaining roadbed, a 30mm flat surface correction layer, a 70mm vegetation base material, and a lawn with rhizomes are laid in order from the bottom in the Wagner pot so that the conditions are the same as for greening pavement. The difference of the effect by the composition (each 3 bodies) of the following vegetation base material was compared. In addition, irrigation curing was performed for 2 weeks after setting the lawn, and after that, it was left for 4 weeks under natural conditions without any modification.

A. Good quality soil B. Good soil + microbial growth promoter C.I. Good quality soil + anion adsorption carbon material D. Good quality soil + microbial growth promoter + commercial activated carbon Good quality soil + microbial growth promoter + anion adsorbing carbon material

  A. Under these conditions, 90% or more of the leaves died in all three specimens. It is presumed that this was insufficient in water retention and suffered from drying problems.

  B. In the above conditions, the green coverage ratio is about 50% on average, C.I. The green coverage ratio is about 70% under the conditions of Under these conditions, the average green coverage was about 50%. From this, it was confirmed that the microbial growth promoter and the anion-adsorbing carbon material had a sufficient effect on the growth of plants under dry conditions. B. And D. No significant difference was observed in the green coverage rate, and the plant growth effect of commercial activated carbon could not be confirmed in this test.

  E. Under the above conditions, the average green coverage was 94% and the growth was the best. Only this condition was outstanding and it was a good result, and it was confirmed that an effect more than that obtained by simply adding the plant growth effect of each of the microbial growth promoter and the anion-adsorbing carbon material was obtained. Although the specific mechanism was not clarified, D.C. Since such an effect could not be confirmed under the above conditions, some synergistic effect was generated by the combination of glycine betaine and anion exchange capacity produced by the microorganism, or the combination of the microorganism itself and anion exchange capacity. Inferred.

  In the construction method of the greening pavement which performs the said process (1)-(5) and the greening pavement formed by this, the following effects are acquired. That is, first, a load (mainly a vertically downward load) applied to the protrusion top portion of the tread pressure preventing material 6 is distributed over the area of the lower surface area of the tread pressure preventing material 6 and further propagates to the adjacent tread pressure preventing material 6. It is transmitted to the water retaining roadbed 2 while being dispersed. Therefore, since the force applied per unit area of the water retaining roadbed 2 becomes very small, a greening pavement capable of withstanding a large load is obtained.

  Moreover, since the water retention road base 2 is in a state in which the water retention material 4 is filled in the gap between the road base materials 3 unlike the conventional road base, the water retention material 4 serves as a cushion, and the road base materials 3 are connected to each other. It is extremely difficult for the water retaining roadbed 2 to sink due to rubbing and abrasion, or to be reduced.

  In particular, according to the above configuration, it becomes possible to cover the water retention / fertilization property, which is likely to be insufficient only with the vegetation base material 7 forming the plant growth layer, in the lower water retention roadbed 2 portion, Good plant growth environment is prepared. Furthermore, since the plant can extend roots not only to the layer of the vegetation base material 7 but also to the layer of the water-retaining roadbed 2 below it, the plant can be strongly rooted so that it can be stably planted over a long period of time. Can be realized.

  In addition, a space where a load of a vehicle or the like is not applied is created between the tread pressure prevention material 6 and the unevenness correction layer 5, and a greening portion (vegetation base material 7 or vegetation base material 7 grows in this space). Since the plant) is arranged, the greening portion can be protected from the treading pressure by the vehicle, and the growth of the plant can be favorably and reliably achieved without damaging the plant growth point.

  Furthermore, the vegetation base material contains at least one of a plant growth promoter containing a microorganism belonging to the genus Staphylococcus or Brevibacterium and an anion adsorbing carbon material that adsorbs nitrate ions. In addition, glycine betaine can impart stress resistance to plants and suppress the loss of nutrients such as nitric acid, so that plants can be cultivated in an environment that is not suitable for plant growth, such as green pavement.

  And although only the top part of the tread pressure prevention material 6 is visually recognized on the surface of a greening pavement, since greening can be aimed at over the other whole, a greening area ratio will also increase significantly.

  The present invention is not limited to this embodiment, and can be implemented with various modifications. Therefore, the modified example will be described below. Of course, it goes without saying that the following modifications can be combined as appropriate.

  In the step (1) of the present embodiment, the roadbed material 3 is laminated directly on the roadbed 1, but another member may be provided between the roadbed 1 and the roadbed material 3.

  Further, in the step (2) of the present embodiment, the roadbed material 3 and the water retaining material 4 are agitated and mixed in advance, but only the roadbed material 3 is laid and rolled on the roadbed 1 to a predetermined thickness, and then in a slurry state. Alternatively, the liquid water retaining material 4 may be filled in the gaps between the roadbed materials 3.

  However, the above-described method requires a separate construction machine such as a pump for filling, and it is difficult to reliably fill the water retaining material 4 in all the gaps between the roadbed materials 3. The method of laying and rolling on the roadbed 1 after mixing the roadbed material 2 and the water retaining material 4 in advance is most preferable.

  In the above step (3) of the present embodiment, the substantially sword-like treading pressure prevention material 6 is used, but other than this can be used as long as it can protect the plant and the vegetation base material 7 from the load of the vehicle or the like. The shape (such as a thick lattice mat) may be used.

  As described above, it is preferable that the water retaining material 4 and the vegetation base material 7 contain an anion adsorbing carbon material, but the anion adsorbing carbon material in a state where nothing is adsorbed on the water retaining material 4. For the vegetation base material 7, it is desirable to use an anion adsorbing carbon material in which nitrate ions are adsorbed in advance.

  By adopting such a configuration, the anion adsorbing carbon material contained in the vegetation base material 7 can supply fertilizer (nitric acid) to the plant from the beginning of construction, and excess nitric acid that the plant does not need is plant It is effective as an ideal fertilizer (a fertilizer that can always provide the amount of nutrients needed by plants) that can continue to be adsorbed and retained in a state where it can be used.

  The anion adsorbing carbon material contained in the water retaining material 4 has a very high adsorbing capacity because nothing has been adsorbed in advance, and it is possible to ensure that a certain amount of nitrate ions are washed away from the vegetation base material 7. To prevent water pollution. Further, since this nitric acid can be supplied as a fertilizer to the rhizomes of plants that will grow in the future, it will be possible to more firmly root the plants and realize stable greening over a long period of time.

  In addition, as described above, as described above, the method of laying the vegetation mat 8 made of lawn is suitable because it is greened immediately after the construction, and is particularly suitable for Staphylococcus spp. Or Brevibacterium spp. It is most desirable to use a vegetation mat provided with a plant growth promoter containing the microorganisms to which the turf has been previously provided with stress resistance in order to maintain the plant in a healthy state for a long time under the special condition of greening pavement. In addition to this method, a method in which seeds and fertilizers are contained in the vegetation base material 7 may be selected, and a vegetation sheet (a seed or fertilizer supported on the back surface of a water-soluble sheet) is laid. May be.

It is a side view which shows roughly the structure of the greening pavement which concerns on one embodiment of this invention. It is explanatory drawing which shows roughly the installation condition of the said greening pavement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Subgrade 2 Water-retaining roadbed 3 Roadbed material 4 Water retention material 5 Uneven correction layer 6 Tread pressure prevention material 7 Vegetation base material 8 Vegetation mat 9 Tire

Claims (2)

  A stepping pressure preventing material is laid on the upper side of the water retaining roadbed formed by stirring and mixing the roadbed material and the water retaining material containing the anion-adsorbing carbon material, laying it on the upper side of the roadbed, and then rolling it. The space protected by the prevention material is filled with a vegetation base material containing a plant growth promoter and / or anion adsorbing carbon material containing a microorganism belonging to the genus Staphylococcus or Brevibacterium, and A greening pavement characterized in that plants are arranged above the vegetation base material.   Stirring and mixing the roadbed material and the water retention material containing the anion adsorbing carbon material, spreading the pressure on the upper side of the roadbed and then rolling it, and preventing the treading pressure on the upper side of the water retention roadbed In addition to laying wood, the space protected by the tread pressure prevention material is filled with a vegetation base material containing a plant growth promoter and / or anion adsorbing carbon material containing microorganisms belonging to the genus Staphylococcus or Brevibacterium Then, the construction method of the greening pavement characterized by consisting of the process of forming a plant growing layer, and the process of arrange | positioning a plant above the said plant growing layer.

Images