JP6283761B1 - Tread pressure prevention material, greening pavement and its construction method - Google Patents

Abstract

[PROBLEMS] To provide a tread pressure prevention material, a greening pavement and a construction method thereof capable of preventing damage due to tread pressure without inconveniences such as an increase in the number of members and man-hours and a decrease in workability. SOLUTION: A plurality of protrusions 4 extending upward and connecting portions 8, 9, and 13 connecting the adjacent protrusions 4 to each other. As the connecting portions 8, 9, a plurality of types of connecting portions 8 having different strengths are provided. , 9, and 13, and the connecting portion 9 that connects the protrusion 4 </ b> X positioned at a corner in a plan view and the protrusion 4 </ b> Y positioned adjacent to the protrusion 4 </ b> X on the outer peripheral portion includes , 9 and 13 is constituted by the strongest connecting portion 9. [Selection] Figure 1

Description

  The present invention relates to, for example, a tread pressure prevention material suitable for construction of a greening parking lot, a greening pavement, and a construction method thereof.

  When a planting plant for greening (lawn or the like) is arranged in a parking space to construct a planting parking lot, it is necessary to protect the plant from automobiles entering and leaving the planting parking lot. As a conventional tread pressure prevention material used for constructing such a green parking lot, for example, a vegetation flooring shown in Patent Document 1 is known. If you lay this vegetation slab with a plurality of convex parts (protrusions) extending upward in the parking space, fill the area around each convex part, and plant plants for greening on it, the convex part The plant is protected because the wheel load of the car is received by.

JP 2009-77686 A

  By the way, prevention of the damage by a treading pressure is mentioned as one of the subjects regarding the conventional treading pressure prevention material concerning a greening pavement. As a countermeasure against this, in the invention described in Patent Document 1, a load distribution reinforcing material is provided on the vegetation slab, and the load applied to one convex portion is distributed to the surrounding convex portions to damage each convex portion. To prevent. However, in this method, not only the cost increases due to the increase in the number of members and the number of man-hours associated with the laying of the load distribution reinforcing material, but the load distribution reinforcing material interferes with the land charging and turf work, and the workability is reduced. In some cases, there is a problem that man-hours are increased and costs are increased accordingly.

  The present invention has been made in consideration of the above-mentioned matters, and the purpose thereof is a treading pressure prevention material capable of preventing damage due to treading without inconveniences such as an increase in the number of members and man-hours and a decrease in workability, It is to provide a greening pavement and a construction method thereof.

In order to achieve the above object, a tread pressure prevention material according to the present invention has a plurality of upwardly extending protrusions and a connecting part that connects the adjacent protrusions, and the connecting part includes a plurality of types having different strengths. A connecting portion is provided, and the connecting portion that connects the protrusion located at each corner in a plan view and the protrusion located adjacent to the protrusion on the outer peripheral portion is the strongest of the plurality of types of connecting portions. It is comprised by the high communication part (Claim 1).

The stepping pressure preventing material has, as the protrusions, a corner protrusion positioned at a corner in plan view and a peripheral protrusion positioned at a periphery other than the corner in plan view, and a minimum cross-sectional area of the connecting portion connected to the corner protrusion. May be greater than the sum of the minimum cross-sectional areas of the connecting portions connected to the peripheral protrusions (Claim 2).
In the trampling preventing member, the upper portion of the projection, as well as exhibit no substantially cylindrical a portion protruding laterally, end located toward sides may be rounded from the outer periphery of the upper surface (claim 3 ).

In the tread pressure prevention material, the protrusion has a step portion at a predetermined height position that serves as a guide for a filling level of a vegetation base material housed in a protective space formed around the plurality of protrusions. (Claim 4 ).

The tread pressure prevention material according to the present invention is provided with a plurality of radially extending grooves at the edge located from the outer peripheral portion to the side surface of the upper surface of the protrusion , and at least a part of the groove is a recessed portion at the center of the upper surface of the protrusion. (Claim 5 ).

On the other hand, in order to achieve the above object, a greening pavement according to the present invention is formed over the periphery of the plurality of protrusions in the tread pressure prevention material according to any one of claims 1 to 4 and the tread pressure prevention material. A vegetation base material housed in the protected space, and a plant disposed on the upper side of the layer formed by the vegetation base material in the protected space (claim 6 ).

On the other hand, in order to achieve the above object, a greening pavement construction method according to the present invention is a greening pavement construction method for obtaining the greening pavement according to claim 5, wherein vegetation is formed above the tread pressure-preventing material. The mat is arranged, and the plant is placed in the protected space by rolling from above the vegetation mat so that the top of the protrusion of the tread pressure-preventing material penetrates the vegetation mat. Item 7 ).

  In the present invention, it is possible to obtain a tread pressure preventing material, a greening pavement, and a construction method thereof that can prevent damage due to tread pressure without causing inconveniences such as an increase in the number of parts and man-hours and a decrease in workability.

  That is, as a result of intensively observing and examining the damage situation of the existing pedaling pressure prevention material, the present inventors mainly cut the steering wheel while the vehicle driver stopped on the pedaling pressure prevention material. ”Was found to be caused by the fact that a load such as threading from the diagonally upward acts on the convex portion (protrusion) of the tread pressure prevention material. Further, it was also found that the breakage was recognized not in the protrusion itself but in the connecting part connecting adjacent convex parts, and in particular, it tends to be prominent in the connecting part near the corner in plan view. This is because the number of connecting portions connected to the convex portion of the corner is small, the load acting on the convex portion of the corner is not easily dispersed, and the load is easily concentrated on each connecting portion connected to the convex portion of the corner. it is conceivable that. And, unlike the method described in Patent Document 1, in the tread pressure prevention material of the invention according to each claim of the present application, a member such as a load distribution reinforcing material is not separately used. Therefore, it is possible to effectively reinforce the connecting portion in the vicinity of the corner portion that is easily damaged without inconvenience such as a decrease in property. In addition, if the strength of all the contact parts is increased uniformly, it will be excessive reinforcement, and there is a risk that the weight and manufacturing cost will increase unnecessarily, but the treading pressure prevention material of the present invention uniformly increases the strength of all the contact parts. Instead, it is possible to achieve a very reasonable increase in strength by intensively reinforcing the connecting portions connected to the protrusions (convex portions) at the corners that require particularly high strength compared to other portions.

Moreover, in the vegetation floor board shown in Patent Document 1, a plurality of vertical ribs extending to the vicinity of the tip of the convex portion are provided around the convex portion in order to reinforce the convex portion. Therefore, after constructing the greening pavement using the vegetation floorboard, for example, when the heel part of the high heel of a pedestrian passing over it reaches the inside of the customer's soil, it easily comes into contact with the vertical rib, and such contact occurs. Otherwise, the high heel may be damaged. Furthermore, since the tip of the convex portion is generally square, there is a concern that it may adversely affect other shoes as well as high heels. Moreover, not only after the construction but also when the worker steps on the convex part during the construction work, he / she feels a strong pain, and there is a concern that the burden on the worker's feet is large and the workability is lowered. However, in the tread pressure prevention material of the invention according to claim 3 , the pedestrian's shoes or the like are difficult to contact the protrusions, or even if contacted, it is difficult to reach the engagement. Damage is less likely to occur. In addition, since it is difficult for the worker to feel strong pain even if the worker steps on the protrusion (convex portion), the burden on the worker can be reduced and workability can be improved. In addition, since the edges of the protrusions (convex parts) are smooth, it is difficult for the protrusions to be caught on the roots of the plants when the vegetation mats are penetrated through the protrusions. Cutting off and loosening of the soil on the vegetation mat can be prevented, and the adverse effects on the plant are inevitably reduced.

In the tread pressure-preventing material of the invention according to claim 4 , when the greening pavement is constructed by filling the space around each protrusion in the tread-pressure preventing material with the vegetation base material, the stepped portion is a measure of the filling level of the vegetation base material. Therefore, workability can be improved.

In the tread pressure prevention material according to the fifth aspect of the invention, drainage on the upper surface of the protrusion is improved, and the occurrence of aquatics and the like is also prevented, so that a pedestrian passing over the protrusion is less likely to slip.

(A) And (B) is a longitudinal cross-sectional view which shows roughly the whole structure and the principal part structure of the greening pavement which concerns on one embodiment of this invention. (A)-(C) are explanatory drawings which show roughly the procedure of the first half of the construction method of the said greening pavement. It is explanatory drawing which shows roughly the procedure of the latter half of the construction method of the said greening pavement. It is a top view which shows roughly the structure of the tread pressure prevention material used for the said greening pavement. It is a bottom view which shows the structure of the said tread pressure prevention material roughly. (A) is a side view of the stepping pressure preventing material, (B) is an enlarged view of a portion in FIG. 4, and (C) is an enlarged view of the portion in FIG. (A) is the sectional view on the AA line in FIG. 4, (B) is the sectional view on the BB line in FIG. 4, (C) is the sectional view on the CC line in FIG. (A) And (B) is a perspective view which shows roughly the structure of the corner projection periphery before reinforcement and after reinforcement.

  Embodiments of the present invention will be described below with reference to the drawings.

  The greening pavement according to the present embodiment is constructed on the upper side of the existing pavement E such as asphalt pavement or concrete pavement as shown in FIGS. 1 (A) and (B).

  First, the construction method of the greening pavement will be described while also explaining the configuration of the greening pavement. The construction method of this greening pavement consists of the following processes (1) to (5).

(1) While arrange | positioning the frame formation member 1 so that the construction target area in the upper surface (existing pavement surface) of the existing pavement E may be enclosed, the water guide sheet 2 is laid without gap in the whole construction target area (FIG. 2 (A)). reference). 2A to 2C show only a part of the construction target area.

  Here, the frame forming member 1 is a plate-like or block-like member and is arranged along the periphery of the construction target area. For example, if the plan view shape of the construction target area is rectangular, the four sides are configured. To be arranged in a frame shape. However, when the construction target area is located along a wall, a crease or the like, the wall, the crease or the like may be used as the frame forming member 1. In this case, the amount of use of the frame forming member 1 is reduced. The frame forming member 1 of the present embodiment is made of synthetic resin (for example, rubber), but is not limited thereto, and may be made of metal or wood, for example.

The water guide sheet 2 is a sheet-like member having a function of preventing suction of soil particles derived from the vegetation base material 6 and the like, which will be described later, and prevents at least suction of soil particles from the gap between the frame forming member 1 and the construction target area. What is necessary is just to arrange | position. In this embodiment, the water guide sheet 2 is disposed so as to cover the frame forming member 1 and the entire construction target area occupying the inside of the frame. As such a water guide sheet 2, for example, a non-woven fabric having a basis weight of 150 to 300 (250 in this example) g / m ² made of synthetic fiber such as nylon, vinylon, polyester fiber or the like can be used. And by using the water conveyance sheet | seat 2, even if there is no gradient in a construction object area, the water | moisture content irrigated can be spread uniformly on the whole construction object area. Further, if the construction target area is, for example, a gradient surface of about 2%, water can be sucked up and expanded not only below but also above the irrigation position. However, when the construction target area is a slope surface, the water may be spread using the slope, and the irrigation position may be set appropriately.

  In addition, when there is a relatively large unevenness on the upper surface of the existing pavement E, repair is performed in advance (there is no need to repair in the case of unevenness even if there is unevenness). Further, after removing pebbles and foreign matters on the existing pavement E, the water guide sheet 2 is laid.

(2) The tread pressure prevention material 3 is laid on the water guide sheet 2 (see FIG. 2B).

  The treading pressure preventing material 3 is a member having a substantially square shape of about 50 cm square in plan view, and as shown in FIG. 3, connecting portions 3a and 3b for connecting adjacent treading pressure preventing materials 3 are formed on each side. Has been.

  Further, as shown in FIG. 3, the tread pressure preventing material 3 has a plurality (a large number) of protrusions 4 that uniformly extend upward and have a flat tip, and as shown in FIG. The distance is sufficiently smaller than the width of a general automobile tire T. And each protrusion 4 has the intensity | strength which can endure the load from the tire T so that the earthing | grounding of the tire T of the motor vehicle (vehicle) which passes on the greening pavement after construction must be made | formed at the top part of each protrusion 4. Therefore, a space continuous over the periphery of the plurality of protrusions 4 extending upward is a protective space that is not subjected to a load from the tire T, and the plant P is arranged in the protective space, and the tire T is at the growth point of the plant P. By making the protrusion 4 long enough so that it does not reach, the plant P can be reliably protected. That is, the protrusion 4 functions as a plant protection material. In addition, although the treading pressure preventing material 3 of the present embodiment is made of resin, the material is not limited to this, and a material that has a certain strength and does not deform or corrode (such as a metal such as steel) can be selected.

  When the tread pressure preventing material 3 does not fit in the construction target area, the end of the tread pressure preventing material 3 may be cut off with a circular saw or the like.

(3) The water supply pipe 5 is appropriately arranged so as to straddle the plurality of stepping pressure preventing materials 3 (see FIGS. 2C and 1A).

  The water supply pipe (infusion tube) 5 has a small-diameter water spout (not shown) at an appropriate interval, and is configured to allow water spraying. In addition, you may fix the water supply pipe | tube 5 to the tread pressure prevention material 3 with a binding band etc., for example.

(4) The vegetation base material 6 is placed in the soil (accommodated) in the space protected by the tread pressure prevention material 3 and spread and formed to form a plant growing layer (see FIGS. 1 and 3).

  In the present embodiment, as shown in FIG. 3, the protrusion 4 of the treading pressure preventing material 3 has a small diameter at the upper part 4a and a large diameter at the lower part 4b, and has a step part 4c at the boundary between the two, so The thickness (height) of the vegetation base material 6 (plant growth layer) is set to be approximately the same as the height of the stepped portion 4c of the tread pressure preventing material 3 (3.5 cm height position). That is, since the stepped portion 4c serves as a standard for the filling level of the vegetation base material 6, it can be filled without causing a bias of the vegetation base material in the construction target area, thereby improving workability and extra. Vegetation base can be reduced. Further, the inside of the protrusion 4 is a cavity opened downward, and a plurality of (in the illustrated example, 8) inner ribs 4d extending vertically are provided on the inner wall at appropriate intervals in the circumferential direction. (See FIGS. 5 and 7B).

  For the vegetation base material 6, for example, a material that exhibits any one or more of the functions as a water retention material, the function as a soil improvement material, the function as a fertilizer, and the function as a plant growth promoter is used alone, or These materials can be used as a mixture. Examples of such materials include peat moss, bark compost, pearlite, vermiculite, bentonite, fertile soil (high quality soil), and sand. In particular, if the vegetation base material 6 contains an anion-adsorbing carbon material, it is possible to adsorb fertilizers such as nitrate ions that are about to run away with moisture. It is also possible to include plant seeds in the vegetation base material 6. In the present embodiment, as the vegetation base material 6, a water retention material, a fertilizer, and a plant growth promoter having an effect of imparting stress resistance to the plant itself are blended and used to impart fertilizer and water retention.

  Here, when the pure sand soil generally used as the vegetation base material is used for the vegetation base material 6, there is a problem that clay and silt contained in the true sand soil flows out as muddy water due to rainwater. By using sand, generation of muddy water, which is a problem in conventional green parking lots, can be suppressed. In particular, when sand having a low moisture content such as baked sand is used, generation of weeds and bacteria can be expected to be suppressed. It can be filled uniformly. Specifically, for example, a flexible container bag containing the vegetation base material 6 is suspended by a crane and held above the tread pressure prevention material 3, and the bottom of the bag is cut to let the vegetation base material 6 flow out. The vegetation base material 6 can be easily and uniformly filled between the protrusions 4 simply by spreading the vegetation base material 6 spreading on the top 3 with a tool such as a dragonfly or a rake. Moreover, since sand has good drainage, it is possible to prevent the underground part from becoming excessively humid due to rainfall or irrigation, and to prevent the occurrence of diseases of plants P such as lawn. Furthermore, when using pure sand soil as the vegetation base material 6 to be laid in the greening parking lot, the true sand soil is solidified under treading pressure, and the plant P tends to decline. In the case, the decline of the plant P can be prevented.

(5) Finally, a vegetation mat 7 (in this embodiment, a mat-like raw turf) containing the plant P is laid (arranged) on the layer of the vegetation base material 6 (plant growth layer) (see FIG. 3). By rolling using a vibrating roller or the like from above the vegetation mat 7 while sprinkling water, the vegetation base material 6 is properly compacted to reduce its thickness (height), and each protrusion 4 of the tread pressure prevention material 3 is reduced. So that the top of the vegetation penetrates to the top of the vegetation mat 7 (see FIGS. 1A and 1B). For the purpose of eliminating irregularities on the surface of the lawn, renewing ground stalks and upright stalks, changing old and new, and reducing dryness, the joints may be applied only to the joints.

  In this way, the growth point of the plant P is disposed below the surface (upper surface) of the tread pressure prevention material 5 by setting the top of the protrusion 4 of the tread pressure prevention material 5 to protrude through the vegetation mat 7. Can do.

  Moreover, the plant P can be firmly brought into close contact with the vegetation base material 6 by this rolling pressure, and it also leads to prevention of drying troubles due to the floating (non-closed state) of the plant P.

  In this construction method in which the above steps (1) to (5) are performed, construction can be performed directly on the existing pavement E, and excavation and removal of the existing pavement E is unnecessary. Can be shortened.

  In the greening pavement constructed as described above, the plant P for greening is protected from the tire T (see FIG. 1 (B)) of the vehicle traveling on the greening pavement by the plurality of protrusions 2 arranged in a substantially sword mountain shape. Plant protection function that can be obtained.

  Moreover, although the top part of the processus | protrusion pressure prevention material 3 protrusion 4 is exposed on the surface of such a greening pavement, greening by the plant P can be aimed at all the other surfaces, and a greening area ratio becomes a very high thing.

  Further, the plant growth function for growing the plant P is obtained by the vegetation base material 6 filled in the protection space formed by the tread pressure preventing material 3, and water spray from the water supply pipe 6 extending over the plurality of tread pressure preventing materials 3 and the tread pressure Since the moisture is spread widely to the vegetation base material 6 by the water diffusing action of the water guide sheet 5 laid under the prevention material 3, this plant growth function is enhanced. Therefore, the thickness of the layer of vegetation base material 6 (plant growth layer), and thus the thickness of the entire greening pavement, can be reduced. In this embodiment, the thickness of the entire greening pavement (thickness of the treading pressure preventing material 3) is 55 mm. However, the present inventors have confirmed that the plant P grows well even if the layer thickness is reduced in this way.

Next, the detailed structure of the tread pressure preventing material 3 will be described.

  As shown in FIGS. 4 and 5, the protrusions 4 of the tread pressure prevention material 3 are arranged in a square lattice point shape in plan view (in this example, there are a total of 49 vertical 7 × horizontal 7), and are adjacent in the vertical and horizontal directions. The protrusion 4 is connected by the connecting part 8 or the reinforcing connecting part 9. The reinforcing connecting portion 9 includes projections 4 positioned at the four corners of the tread pressure prevention material 3 whose outer peripheral portion has a square shape in plan view, and projections 4 adjacent to the four protrusions 4 in the vertical and horizontal directions. It is provided only at the connecting part and has higher strength than the connecting part 8.

  As shown in FIG. 7A, the connecting portion 8 has a flat plate portion 8a extending horizontally and a rib 8b standing from the center in the width direction of the flat plate portion 8a. As shown in FIG. 7B, the edge is curved such that the central portion in the length direction is low and the sides are higher.

  As shown in FIG. 7A, the reinforcing connecting portion 9 is provided with a hollow portion extending upward from the center in the width direction of the bottom surface of the block body having a large thickness in the vertical direction of the flat plate portion 8a. A base portion 9a having a shape (vertical cross-sectional shape obtained by rotating the U-shape by 90 degrees counterclockwise) and two ribs 9b and 9b standing from both ends in the width direction of the base portion 9a, The upper edge of the rib 9b is curved similarly to the rib 8b (see FIG. 6).

  On the other hand, as shown in FIGS. 3 and 7A to 7C, the upper portion 4a of the protrusion 4 does not have a side protruding portion and is not cut out (solid) in a substantially cylindrical shape. The edge located from the outer peripheral part of the upper surface to the side surface is rounded. Since the upper part 4a of the protrusion 4 has such a shape, it becomes difficult for a pedestrian's shoes or the like to come into contact with the protrusion 4, or even if it comes into contact, it is difficult to engage with the pedestrian's shoes. Etc. are less likely to be damaged. Moreover, since it is difficult for the worker to feel strong pain even if the worker steps on the protrusion 4, the burden on the worker can be reduced and workability can be improved. In addition, since the edges of the projections 4 are smooth, it is difficult for the roots of the plants P to be caught when the vegetation mats 7 are penetrated by the respective projections 4. Cutting off and loosening of the floor soil attached to the vegetation mat 7 can be prevented, and the adverse effect on the plant P is inevitably reduced. Moreover, although the upper surface of the upper part 4a has a circular shape in plan view, its diameter is 20 to 30 mm (for example, 24 mm), and since the surface area is larger than the conventional one, the pedestrian puts his feet on the protrusions 4. Even when it is placed, you will feel high stability.

  Further, the upper surface of the protrusion 4 is provided with irregularities. Specifically, as shown in FIG. 6C, a plurality of radially extending grooves 10 are provided at the edge, and at least one of these grooves 10 is provided. The portion extends to a recessed portion 11 having a substantially circular shape in plan view at the center of the upper surface of the protrusion 4, and a plurality of protruding portions 12 having the same height as the edge portion are provided in the recessed portion 11. By providing such irregularities on the upper surface of the protrusion 4, drainage on the upper surface of the protrusion 4 is improved, and the occurrence of water bullies and the like is prevented, so that a pedestrian passing through the protrusion 4 is less likely to slip.

  On the other hand, as shown in FIGS. 4 and 5, the protrusions 4 adjacent to each other in the vertical and horizontal directions are connected by the connecting portions 8 and 9 as described above. (See also FIG. 7C). Here, as described above, the planar view of the tread pressure preventing material 3 in which the protrusions 4 are arranged in a square lattice shape and the connecting portions 8 and 9 are connected in the vertical and horizontal directions is divided by the connecting portions 8 and 9 extending in the vertical and horizontal directions. It can be considered that the shape has a plurality of squares, and in each square, the auxiliary communication part 13 extends diagonally. And the structure of the auxiliary | assistant connection part 13 which connects the two protrusions 4 diagonally adjacent is the same as that of the rib 8b of the connection part 8 which connects the two protrusions 4 which adjoin vertically and horizontally, and the auxiliary | assistant connection part 13 in each square. In other words, it has a shape in which two ribs 8b are combined in an X shape in plan view.

  However, in the present embodiment, the auxiliary connecting portion 13 at a position connecting the protrusions 4 at the corners (four corners) of the pedaling pressure preventing material 3 in a plan view on the diagonal line and the corners (four corners) of the pedaling pressure preventing material 3 in the plan view. As shown in FIGS. 4 and 5, the auxiliary communication portion 13 in a certain square has a portion corresponding to the flat plate portion 8 a of the communication portion 8 and has a high strength (FIG. 6B). reference).

  Further, in the tread pressure preventing material 3 of the present embodiment, the portions where the protrusions 4, the connecting portions 8, 9 and the auxiliary connecting portion 13 do not exist in a plan view are open (auxiliary communication in each square having a substantially square shape in the plan view. There is nothing in the portion other than the portion 13). Therefore, in the greening pavement after construction, a wide contact area is secured between the vegetation base material 6 and the water guide sheet 2, and the moisture diffusing action by the water guide sheet 2 is sufficiently exhibited. .

  As described above, in the present embodiment, a plurality of types of connecting portions 8, 9, and 13 having different strengths are provided as connecting portions that connect the protrusions 4. Here, if the protrusions 4 are classified according to the number of connecting parts 8, 9, and 13 without distinguishing the connecting parts 8, 9, and 13, the corner protrusions 4X that are located at corners in plan view and that connect the three connecting parts are connected. And a peripheral protrusion 4Y that is located in the periphery other than the corner in plan view and that is connected to five communication parts, and an internal protrusion 4Z that is located in a plan view other than the periphery and that is connected to eight communication parts. Yes (see FIG. 4). And if each connection part 8,9,13 is made the same intensity | strength, when the load which is threaded to the processus | protrusion 4 will act, the number of the connection parts 8,9,13 connected to this processus | protrusion 4 is smaller, The load tends to concentrate on each connecting portion, and is easily damaged.

  Therefore, basically, it is preferable that the strength of the connecting portion connected to the corner protrusion 4X is higher than that of the connecting portion connected to the peripheral protrusion 4Y and the internal protrusion 4Z. In this embodiment, each of the connecting portion 8 and the auxiliary connecting portion 13 has one rib, and the reinforcing connecting portion 9 has two ribs, so that the number of ribs connected to the corner projection 4X is also increased in the periphery. The number of ribs connected to the protrusion 4Y is also five. Incidentally, the number of ribs connected to the internal protrusion 4Z is eight.

Further, the minimum cross-sectional area of the connecting portion connected to each protrusion 4 (the cross-sectional area of each connecting portion connecting the two protrusions 4 is the smallest cross-sectional area when the cross-sectional area changes according to the distance from the two protrusions 4) In this embodiment, the sum of the minimum cross-sectional areas of the connecting portions connected to the internal protrusions 4Z is 3.84 cm ² , and the sum of the minimum cross-sectional areas of the connecting portions connected to the peripheral protrusions 4Y is ² in this embodiment. .70 cm ² , and the sum of the minimum cross-sectional areas of the connecting portions connected to the corner protrusions 4X is 2.76 cm ² . Thus, it is preferable that the sum of the minimum cross-sectional areas of the connecting portions connected to the corner protrusions 4X is larger than the sum of the minimum cross-sectional areas of the connecting portions connected to the peripheral protrusions 4Y. Incidentally, the sum of the minimum cross-sectional areas of the connecting portions connected to the corner protrusions 4X (see FIG. 8A) when the reinforcing connecting portion 9 is the connecting portion 8 (before reinforcement) is 1.90 cm ² .

  Furthermore, in order to confirm that the material can be effectively reinforced by slightly increasing the material used for the weakest four corner projections 4X, the corner projections 4X before reinforcement shown in FIG. With respect to the corner protrusion 4X after reinforcement (this embodiment) shown in (B), when the load from 45 ° obliquely above was applied, the maximum load and deformation amount that led to breakage were measured. The amount of deformation was 13.5 mm, the maximum load was 3765 N after reinforcement, and the amount of deformation was 15.1 mm. That is, the reinforcing connecting portion 9 connected to the corner projection 4X after reinforcement (this embodiment) shown in FIG. 8B is the connecting portion 8 in the corner projection 4X before reinforcement shown in FIG. It takes about 18 g of material to make one connecting part 8 as a reinforcing connecting part 9, but the strength (maximum load) is improved by about 46% with such a slight increase in material. Nevertheless, it is clear from the above results that the above reinforcement is extremely effective.

  Further, when a certain load (2000 N) is applied to the corner protrusions 4X and the internal protrusions 4Z obliquely from above 45 °, the amount of stress generated in each protrusion 4 is examined by FEM analysis. The maximum stress is 27.9 MPa, the maximum stress is 35.4 MPa in the corner protrusion 4X before reinforcement shown in FIG. 8 (A), and 22.5 MPa in the corner protrusion 4X after reinforcement (this embodiment) shown in FIG. 8 (B). Results were obtained. That is, the stress generated in the corner projection 4X is reduced and relaxed to about 64% by reinforcement, and is reduced and relaxed to about 81% of the stress generated in the strongest internal projection 4Z. Compared to the maximum allowable stress value of polypropylene, which is a material often used for tread pressure prevention materials, the numerical value before reinforcement (35.4 MPa) exceeds the maximum allowable stress value, and it is not surprising that damage occurs. However, the numerical value after reinforcement (22.5 MPa) is less than the maximum allowable stress value and can be said to be highly safe.

  In the present embodiment, unlike the method described in Patent Document 1, a member such as a load distribution reinforcing material is not used separately, so there is no inconvenience such as an increase in the number of parts and man-hours and a decrease in workability. The connecting portion 9 near the corner portion that is easily damaged can be effectively reinforced. Moreover, if the strengths of all the connecting portions 8, 9, and 13 are uniformly increased, excessive reinforcement will occur, and there is a risk that the weight and manufacturing cost may increase unnecessarily. Rather than increasing the strength of the portions 8, 9, and 13 uniformly, it is extremely rational by reinforcing the connecting portion 9 connected to the corner projection 4X that requires particularly high strength compared to the other portions. Strength can be increased.

  Further, as a method of reinforcing the connecting portion 9, if the connecting portion 8 is simply made thicker, a molding defect that easily deforms when cooled after demolding due to a difference in the amount of heat of the molded product may occur. The gap between the protrusions 4 becomes narrow in both the vertical direction and the horizontal direction, preventing the roots of the plant P from spreading, and it may not be possible to maintain good greening. However, in the present embodiment, since the strength is increased by increasing the number of ribs or the like, the above inconvenience hardly occurs.

  In addition, this invention is not limited to said embodiment at all, Of course, it can change and implement variously in the range which does not deviate from the summary of this invention. For example, the following modifications can be given, and it goes without saying that the modifications described in the present specification may be appropriately combined.

  The greening pavement of the present invention may be constructed not on the existing pavement E but on, for example, an unpaved leveling surface. In this case, the root of the plant penetrates the water guide sheet 2 laid in the step (1). If it has a function, even if this water guide sheet 2 is spread over the entire construction target area, the plant penetrates the water guide sheet 2 and grows well.

  The tread pressure preventing material 3 may have, for example, a rectangular shape or a polygonal shape in plan view.

  The protrusions 4 may be arranged in a rectangular lattice point shape, other lattice shapes, or the like instead of the square lattice shape.

  If the construction target area is on a sloping ground, the drainage effect can be obtained by the slope, but if it is not on such a sloping ground, a drainage hole is appropriately provided in advance in the existing pavement E in the construction target area, and the drainage function is provided in the hole. You may make it accommodate the crushed stone etc. which are not lost.

  A slope forming body for providing a slope may be provided at a part where the vehicle enters the greening pavement, and such a slope part may be provided in the frame forming member 1.

  In the above step (5), a vegetation mat 7 made of lawn is laid and greening is started immediately after construction. However, the present invention is not limited to this. For example, the vegetation mat 7 is not laid, A fertilizer or the like may be added to wait for germination, and a vegetation sheet (a seed or fertilizer supported on the back surface of a water-soluble sheet) may be laid instead of the vegetation mat 7.

DESCRIPTION OF SYMBOLS 1 Frame formation member 2 Water guide sheet 3 Tread pressure prevention material 3a Connection part 3b Connection part 4 Protrusion 4a Upper part 4b Lower part 4c Step part 4d Inner rib 4X Corner protrusion 4Y Peripheral protrusion 4Z Internal protrusion 5 Water supply pipe 6 Vegetation base material 7 Vegetation mat 8 Connection Part 9 Reinforcement connecting part 10 Groove 11 Recessed part 12 Convex part 13 Auxiliary connecting part E Existing pavement P Plant T Tire

Claims (7)

A plurality of protrusions extending upward, and a connecting portion that connects the adjacent protrusions,
As the communication part, a plurality of types of communication parts having different strengths are provided,
The connecting portion that connects the protrusion located at each corner in a plan view and the protrusion located adjacent to the protrusion on the outer peripheral portion is configured by the strongest connecting portion of the plurality of types of connecting portions. A tread pressure prevention material characterized by being. As the protrusions, there are corner protrusions located in the corners in plan view, and peripheral protrusions located in the periphery other than the corners in plan view,
The tread pressure-preventing material according to claim 1, wherein the sum of the minimum cross-sectional areas of the connecting portions connected to the corner protrusions is greater than the sum of the minimum cross-sectional areas of the connecting portions connected to the peripheral protrusions.   The tread pressure-preventing material according to claim 1 or 2, wherein an upper portion of the protrusion has a substantially columnar shape having no portion projecting sideways, and an edge located from an outer peripheral portion to a side surface of the upper surface is rounded. . The said protrusion has the step part used as the standard of the filling level of the vegetation base material accommodated in the protection space formed over the circumference | surroundings of these protrusions in the predetermined height position. The tread pressure prevention material according to any one of the above. A plurality of radially extending grooves are provided in an edge located from an outer peripheral portion to a side surface of the upper surface of the protrusion, and at least a part of the groove extends to a recessed portion in a central portion of the upper surface of the protrusion. 5. The tread pressure prevention material according to any one of 4 above.   In the tread pressure prevention material according to any one of claims 1 to 5, a vegetation base material housed in a protection space formed around the plurality of protrusions in the tread pressure prevention material, and in the protection space A greening pavement including a plant disposed on an upper side of a layer formed by the vegetation base material. It is the construction method of the greening pavement for obtaining the greening pavement of Claim 6, Comprising: The vegetation mat is arrange | positioned above the said treading pressure prevention material, and it rolls from above the said vegetation mat, and the said protrusion of the said treading pressure prevention material The construction method of the greening pavement which distributes the said plant in the said protection space by setting it as the state which penetrated the top of this vegetation mat.

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