Pavement materials and methods for constructing pavement surfaces

Abstract

To provide a pavement material which eliminates the need for filling joints with sand or the like, can be easily constructed in a short time, and can suitably avoid the problem of noise in tightening a bedding sand layer, and a method for constructing a pavement surface.SOLUTION: In a pavement material 1 with a specific gravity of 1.15 or more, having a horizontal square upper surface part 2 and a lower surface part 3 and four vertical side parts 4a-4d, a large number of small groove parts are formed on the surfaces of the upper surface part 2 and the lower surface part 3, a protrusion part 5 extending in the horizontal direction is formed on two side parts 4a, 4c, and a groove part 6 extending in the horizontal direction is formed on the remaining two side parts 4b, 4d, the height dimension of the groove part 6 is set larger than the thickness dimension of the protrusion part 5, and the depth dimension of the groove part 6 is set larger than the protrusion dimension of the protrusion part 5 so that the protrusion part 5 and the groove part 6 are configured to engage in a non-contact state.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a paving material and a method for constructing a paved surface using the paving material. [Background technology]

[0002] Interlocking block paving is a known method for paving sidewalks, roadways, garages, and other public spaces. When carrying out this paving method, first, as shown in Figure 11, concrete curb blocks 12 (tower blocks, boundary blocks, etc.) are placed so as to surround the periphery of the pavement surface to be constructed, and sand is laid on top of the base layer 10 formed in the inner area to form a sand layer 11.

[0003] On top of this sand layer 11, a large number of concrete paving blocks 15 are arranged in a regular pattern with regular intervals (joints), and these paving blocks 15 are vibrated from above using a plate compactor (vibrating compaction machine) to compact the sand layer 11, aligning the height of the top surfaces of the paving blocks 15 to form a flat paved surface, and sand 16 (joint material) is filled into the gaps between the paving blocks 15.Furthermore, the gaps between the curb blocks 12 and the paving blocks 15 are filled with sealing material 13. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-94376 A Summary of the Invention [Problem to be solved by the invention]

[0005] As mentioned above, when constructing interlocking block pavement, a process is carried out to fill the joints with sand 16 so that the paving blocks 15 can interlock with each other and maintain a stable state. However, this process requires the steps of scattering a large amount of sand onto the pavement surface formed by lining up many paving blocks 15, spreading it over the entire pavement surface using a broom or the like, pouring the sand 16 into all the joints, and finally, collecting the excess sand from the pavement surface, which is extremely time-consuming and labor-intensive.

[0006] In addition, when the plate compactor is operated (vibrated) on the paving blocks 15 to compact the sand layer 11, there is a problem that an extremely loud noise is generated due to small collisions between the metal vibration plate (the bottom plate of the plate compactor) and the concrete paving blocks 15. Furthermore, there is a problem that the sand 16 filled in the joints flows out, loosening the fixation of the paving blocks 15, causing a loss of flatness or damage to the paving blocks 15.

[0007] The present invention seeks to solve such problems in the prior art, and aims to provide a paving material and a construction method for a pavement surface which does not require filling the joints with sand or the like, can be easily constructed in a short time, and can preferably avoid the problem of noise when compacting the sand layer. [Means for solving the problem]

[0008] The paving material of the present invention is a paving material with a specific gravity of 1.15 or more having horizontal square upper and lower surfaces and four vertical sides, wherein a large number of small grooves are formed on the surface of the upper and / or lower surfaces, wherein horizontally extending ridges are formed on two of the four sides and horizontally extending grooves are formed on the remaining two sides, wherein the height dimension of the grooves is set greater than the thickness dimension of the ridges and the depth dimension of the grooves is set greater than the protruding dimension of the ridges, and wherein the ridges and grooves are configured in a shape and size such that when two paving materials are arranged so that their upper surfaces are flush with each other, the ridges of one paving material can engage with the grooves of the other paving material in a non-contact manner.

[0009] Furthermore, it is preferable that protrusions are formed on two of the four side portions, and grooves are formed on the remaining two parallel side portions, and that the small grooves formed on the surface of the upper and / or lower portion extend linearly in a direction parallel to the grooves formed on the sides, and that the protrusions and grooves are formed at an intermediate height position on each side, and that the thickness dimension of the protrusions is set to 8 mm or more.

[0010] Another paving material according to the present invention is a paving material having a specific gravity of 1.15 or more and having horizontal square upper and lower surfaces and four vertical sides, and includes a paving material having a number of small grooves formed on the surface of the upper and / or lower surface and having horizontally extending ridges formed on the four sides, and a paving material having horizontally extending grooves formed on the four sides, wherein the height dimension of the grooves is set to be greater than the thickness dimension of the ridges and the depth dimension of the grooves is set to be greater than the protruding dimension of the ridges, and the ridges and grooves are configured in shapes and dimensions such that when the two paving materials are arranged so that their top surfaces are flush, the ridges of one paving material and the grooves of the other paving material can engage in a non-contact state.

[0011] The method of constructing a pavement surface according to the present invention is a method of constructing a pavement surface by arranging the above-mentioned paving materials in a regular pattern on a layer of laid sand, and is characterized in that the paving materials are arranged so that the upper surfaces of two adjacent paving materials are flush, so that the side portion having the protrusion of one paving material faces the side portion having the groove of the other paving material, so that a certain gap is formed between the paving materials, and so that the protrusion of one paving material partially penetrates into the groove of the other paving material and engages in a non-contact manner.

[0012] Furthermore, it is preferable that the joint width between two adjacent paving materials is set within the range of 1 to 3 mm, and the engagement width between the protrusion and groove portions is set within the range of 0.5 to 1.5 mm.

[0013] Furthermore, it is preferable to lay sand or dry-mixed mortar, compact it with a trowel, long rod or compacting machine, level the surface to form a sand layer, and then place the paving material on top of that. It is also preferable to form a sand layer in the area inside the curb blocks that are placed to surround the periphery of the pavement surface to be constructed.

[0014] The method for manufacturing paving material according to the present invention is characterized in that a plastic raw material and an auxiliary raw material are supplied to an extrusion molding machine, and a long molded product is extruded from the die of the extrusion molding machine, with grooves formed on both the left and right sides and with a large number of small grooves formed on the top and bottom surfaces. This long molded product is then cooled while being transported, and cut into a direction perpendicular to the longitudinal direction by a cutting device, horizontal incisions are made on the cut surfaces, and further vertical incisions are made from the top and bottom surfaces, so that two small rod-shaped pieces are cut out from each cut surface, thereby producing a paving material having horizontally extending ridges on two of the four parallel sides and horizontally extending grooves on the remaining two parallel sides. Effect of the Invention

[0015] The paving material according to the present invention has sufficient non-slip performance (non-slip performance) even in rainy weather, is not easily cracked, has sufficient strength (flexural breaking strength of 10 MP or more), is resistant to deterioration and wear, and has sufficient durability. Furthermore, since the specific gravity is adjusted to 1.15 or more, it is expected that the paving material will not float on the water even if the paving surface is submerged after installation, and is stable and will not easily move even in strong winds. Furthermore, when two paving materials are arranged so that their upper surfaces are flush with each other and a certain gap is formed between them, the protrusions of one paving material can partially enter the grooves of the other paving material and engage in a non-contact state.

[0016] In addition, according to the pavement construction method of the present invention, by securing a joint width of 1 to 3 mm between the pavement materials and engaging the protrusions in the grooves to place the adjacent pavement materials, the sand of the laid sand layer during construction and the small amount of sand remaining around the pavement layer can be contained within the joint width of 1 to 3 mm, and a stable arrangement can be obtained. Therefore, there is no need to fill the joints with sand, and construction can be easily performed in a short time. Furthermore, the problem of noise when compacting the laid sand layer can be preferably avoided. In addition, since a sufficiently large gap is formed between two adjacent pavement materials, water can be quickly drained from the pavement surface to the lower layer through the gap even in rainy weather.

[0017] Furthermore, in the pavement construction method of the present invention, pavement materials are used that are configured so that the ridges and grooves can engage without contact, so they can be engaged without problem even if one or both of the pavement materials 1 have slight warping or sinking, or the material of the raw material used has undergone expansion and contraction.Furthermore, even when forming a pavement surface with a varying gradient, the ridges and grooves can be engaged without problem. [Brief description of the drawings]

[0018] [Figure 1]FIG. 1 is a perspective view of a paving material 1 according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a partially enlarged view of the paving material 1 shown in FIG. [Diagram 3] FIG. 3 is a cross-sectional view of the vicinity of the ends of the ridges 5 and grooves 6 of the paving material 1 shown in FIG. [Figure 4] FIG. 4 is an explanatory diagram of an example of a method for producing the paving material 1 shown in FIG. 1, and is a side view of a region in the vicinity of a cut surface 8 of a long molded product extruded from a die. [Diagram 5] FIG. 5 is an explanatory diagram of a method for constructing a pavement according to a third embodiment of the present invention, showing a cross-sectional view of a base layer 10, a sand layer 11, and a paving material 1 placed thereon. [Figure 6] FIG. 6 is an explanatory diagram of a construction method for a pavement according to a third embodiment of the present invention, and is a plan view of the pavement material 1. [Figure 7] FIG. 7 is an explanatory diagram of a method for constructing a pavement according to a third embodiment of the present invention, and is a cross-sectional view of pavement material 1 in which ridges 5 and grooves 6 engage in a non-contact state. [Figure 8] FIG. 8 is an explanatory diagram of a method for constructing a pavement according to a third embodiment of the present invention, showing a cross-sectional view of paving material 1 that engages in a pavement surface with a varying gradient. [Figure 9] FIG. 9 is a cross-sectional view of the vicinity of an end portion of a paving material 1 according to a fourth embodiment of the present invention. [Figure 10] FIG. 10 shows an example of constructing a pavement surface with a varying gradient using paving material 1 according to the fourth embodiment of the present invention, and is a cross-sectional view of paving material 1 in which protrusions 5 and grooves 6 engage in a non-contact manner. [Figure 11] FIG. 11 is an explanatory diagram of a conventional construction method for interlocking block pavement. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The present invention can be embodied as a "pavement material" and a "manufacturing method for pavement material", and can also be embodied as a "construction method for pavement surface". Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0020] First embodiment Fig. 1 is a perspective view of a paving material 1 according to a first embodiment of the present invention, and Fig. 2 is a partially enlarged view thereof. The paving material 1 according to this embodiment is a molded product (specific gravity 1.15 or more) that has a square basic planar shape, is molded into a plate shape with a uniform thickness overall, and has horizontal upper and lower surface portions 2 and 3, and four vertical side portions 4 (4a to 4d), and can be used as a material for forming paved surfaces for sidewalks or roadways.

[0021] Of the four sides 4a to 4d, two parallel sides 4a, 4c (side 4a and the opposite side 4c) each have a protrusion 5 (tongue / groove) extending horizontally (in the width direction of the paving material 1). The remaining two sides 4b, 4d (two parallel sides 4b, 4d adjacent to sides 4a, 4c, respectively) each have a groove 6 extending horizontally (in the width direction of the paving material 1).

[0022] The ridges 5 and grooves 6 are formed at the midpoint of the height of each side portion 4. Therefore, even if the paving material 1 is turned over from the state shown in Fig. 1 or 2 (turned over so that the lower surface portion 3 is on the top and the upper surface portion 2 is on the bottom), the height positions of the ridges 5 and grooves 6 will not change. Furthermore, the height dimension of the grooves 6 (the dimension from the lower edge 6b to the upper edge 6a shown in Fig. 2) is set to be greater than the thickness dimension of the ridges 5 (the dimension from the lower edge 5b to the upper edge 5a shown in Fig. 2), and the depth dimension of the grooves 6 is set to be greater than the protruding dimension of the ridges 5.

[0023] In this embodiment, the upper surface portion 2 and the lower surface portion 3 are formed into a square with each side being 300 mm long, and the height of each of the four side portions 4 (4a to 4d) is set to 30 mm. The thickness T1 (see FIG. 3) of the protrusion 5 is set to 10 mm, the protrusion dimension D1 is set to 3 mm, the height T2 of the groove 6 is set to 12 mm, and the depth D2 is set to 4 mm.

[0024] Furthermore, numerous small grooves having a depth of 0.5 to 2 mm are formed on each surface of the upper surface portion 2 and the lower surface portion 3. These small grooves extend linearly in a direction parallel to the groove portion 6 formed on the side portion 4b, as shown in Figures 1 and 2. Each small groove has a uniform cross-sectional shape (i.e., the cross-sectional shape perpendicular to the longitudinal direction is the same at any position in the longitudinal direction), but the depth, width, and shape vary from small groove to small groove, and they are arranged randomly (i.e., small grooves of the same size and shape are not regularly arranged side by side).

[0025] This paving material 1 has sufficient non-slip performance (ability to prevent slipping) even in rainy weather due to the numerous small grooves on the upper surface 2, and is not easily cracked, has sufficient strength, is resistant to deterioration and wear, and has sufficient durability. Furthermore, since the specific gravity is adjusted to 1.15 or more, it will not float on the water even if the paving surface is submerged after installation, and it is expected to be stable even in strong winds and not easily move.

[0026] Furthermore, the lower surface portion 3 also has a large number of small grooves formed therein similar to those in the upper surface portion 2, and the protrusion portions 5 and groove portions 6 are formed at a mid-height position on each side portion 4, so that it is possible to use the product upside down so that the lower surface portion 3 is on the top and the upper surface portion 2 is on the bottom.

[0027] Furthermore, when two paving materials 1 are arranged side by side so that their upper surfaces 2 are flush with each other and a certain gap is formed between them, the protrusion portion 5 of one paving material 1 can partially penetrate into the groove portion 6 of the other paving material 1, allowing the protrusion portion 5 and the groove portion 6 to engage in a non-contact state.

[0028] The paving material 1 of this embodiment has a thickness of 30 mm, but can be changed appropriately within the range of 25 to 60 mm. The thickness T1 (see FIG. 3) of the protrusion 5 is preferably about 1 / 3 of the thickness of the paving material 1, but is preferably at least 8 mm from the viewpoint of strength. In addition, the thickness T3 of the upper portion of the groove 6 (the portion from the upper edge 6a of the groove 6 to the upper surface portion 2 shown in FIG. 3) and the lower portion of the groove 6 (the portion from the lower edge 6b of the groove 6 to the lower surface portion 3 shown in FIG. 3) is also preferably at least 8 mm from the viewpoint of strength.

[0029] Second Embodiment The paving material 1 of the first embodiment can be manufactured, for example, by the following method: First, a plastic raw material and auxiliary raw materials (for example, powdered or granular fillers such as wood powder or wood grains, pigments, various additives, etc.) are supplied to an extrusion molding machine (not shown) equipped with a die, and extrusion molding is performed, and a long molded product 300 mm wide and 30 mm thick is continuously extruded from the die, with grooves 6 as shown in Figures 1 and 2 formed on both the left and right sides (sides 4b, 4d) and numerous small grooves formed on the upper surface 2 and lower surface 3.

[0030] This long molded product is transferred while being cooled, and cut by a cutting device in a direction perpendicular to the longitudinal direction (extrusion direction) to a length of 306 mm. Then, incisions are made along the dashed lines shown in Fig. 4. More specifically, horizontal incisions are made 3 mm deep at positions 10 mm below the upper surface 2 and 10 mm above the lower surface 3 on the cut surface 8, and further incisions are made vertically from the upper surface 2 and the lower surface 3 to cut out two rod-shaped small pieces 9 (or the cut surface 8 is cut to remove the portions shown by the dashed lines in Fig. 4). Then, the upper and lower edges (the hatched portions shown in Fig. 4) are cut and chamfered to produce the paving material 1 (paving material 1 having protrusions 5 on the sides 4a, 4c) as shown in Figs. 1 and 2.

[0031] In this embodiment, a long molded product with a width of 300 mm is extruded and cut in the direction perpendicular to the longitudinal direction to a length of 306 mm, but a molded product with a width of 100 mm may be extruded and cut to a length of 106 mm. In other words, when a molded product with a width of X mm is extruded, it is cut at a length of X+6 mm, and the two cut surfaces 8 are processed to produce a paving material 1 whose basic shape is a square of X mm on each side and which has ribs 5 of 3 mm on the two side portions 4a, 4c.

[0032] Third embodiment 5 to 7 are explanatory diagrams of a "construction method of pavement surface" according to the third embodiment of the present invention. First, as shown in FIG. 5, concrete curbstone blocks 12 (frontage blocks, boundary blocks, etc.) are arranged so as to surround the periphery of the pavement surface to be constructed, and broken granite, crushed stone, etc. are laid in the inner area, and compacted by a rammer or the like (or concrete is poured) to form a base layer 10, on which sand (or dry-mixed mortar) is laid, and compacted using a compaction machine (plate compactor, etc.) or a trowel, long rod, etc., to level the surface and form a sand layer 11. Then, on this sand layer 11, a large number of pavement materials 1 (pavement materials 1 according to the first embodiment shown in FIG. 1 to FIG. 3) are regularly arranged and placed.

[0033] At this time, as shown in Figure 6, the orientations of two adjacent paving materials 1 are adjusted so that they differ by 90°, and the side 4a or 4c (side having the protrusion 5) of one paving material 1 faces the side 4b or 4d (side having the groove 6) of the other paving material 1, and as shown in Figure 7, a certain gap C1 (joint) is formed between the two adjacent paving materials 1, and the protrusion 5 of one paving material 1 partially penetrates into the groove 6 of the other paving material 1, with the protrusion 5 and groove 6 engaging in a non-contact state.

[0034] More specifically, the protrusion dimension of the protrusion 5 of this paving material 1 is set to 3 mm, so by setting the dimension of the gap C1 (joint width) to less than 3 mm, the protrusion 5 can be made to partially enter the groove 6 of the adjacent paving material 1. In this embodiment, the dimension of the gap C1 (joint width) is set to 2 mm, so that a portion of the protrusion 5 extending 1 mm from the tip enters the groove 6. During construction, the paving material 1 is placed between the two paving materials 1 (space above the protrusion 5) with a 2 mm thick spacer 17 (plastic piece) sandwiched therebetween, and then the spacer 17 is removed to form a 2 mm wide gap C1 (joint).

[0035] As described above, the protrusions 5 and grooves 6 are each formed at the middle height positions of the side portions 4a to 4d. Furthermore, the thickness dimension T1 (see FIG. 3) of the protrusions 5 is set to 10 mm, the protrusion dimension D1 is set to 3 mm, the height dimension T2 of the grooves 6 is set to 12 mm, the depth dimension D2 is set to 4 mm, and the dimension (joint width) of the gap C1 (see FIG. 7) is set to 2 mm. Therefore, when two paving materials 1 are arranged so that their heights match (so that their upper surfaces 2 are flush), as shown in FIG. 7, a gap C2 of 1 mm is formed between the upper edges 5a of the protrusions 5 and the upper edges 6a of the grooves 6, a gap C3 of 1 mm is formed between the lower edges 5b of the protrusions 5 and the lower edges 6b of the grooves 6, and a gap C4 of 3 mm is formed between the tip ends of the protrusions 5 and the innermost parts of the grooves 6, allowing the protrusions 5 and the grooves 6 to engage in a non-contact state.

[0036] In this way, a pavement surface can be easily constructed by laying a large number of paving materials 1 on the sand layer 11 in the area surrounded by the curb blocks 12 (see FIG. 5). It is preferable to fill the gap between the outermost paving material 1 (the paving material 1 placed close to the curb blocks 12) and the curb blocks 12 with a sealant 13 (elastic sealant, cement joint material, etc.) as shown in FIG. 5 to fix the outermost paving material 1. It is also preferable to construct the paving material 1 so that the top surface of the paving material 1 is about 2 to 3 mm higher than the top surfaces of the curb blocks 12.

[0037] In the conventional general construction method for interlocking block pavement, as shown in Figure 11, a process of filling the joints with sand 16 is required to interlock the paving blocks 15 together to achieve a stable state, which has the problem of being extremely time-consuming and laborious. In addition, when the sand layer 11 is compacted using a plate compactor, the metal vibration plate (the bottom plate of the plate compactor) collides with the concrete paving blocks 15, generating a very loud noise. However, according to the pavement construction method of this embodiment, the paving materials 1 can be stabilized by engaging the protrusions 5 into the grooves 6, so there is no need to fill the joints with sand, etc., and construction can be carried out easily in a short amount of time. In addition, the problem of noise when compacting the sand layer 11 can be preferably avoided.

[0038] Furthermore, the paving material 1 used in this embodiment basically has almost no water permeability (unless a large number of holes are formed that penetrate from the upper surface 2 to the lower surface 3). However, in the pavement construction method of this embodiment, as shown in Figure 7, sufficiently large gaps C1 to C4 are formed between two adjacent paving materials 1, so that even in rainy weather, water can be quickly drained from the top of the pavement surface to the lower layer (the sand layer 11 shown in Figure 5) through these gaps C1 to C4, and the large number of small grooves formed in the upper surface 2 provide non-slip performance.

[0039] Furthermore, if the protrusion 5 and groove 6 are sized so that they fit together without any gaps, when joining two adjacent paving materials 1 together, it will be necessary to hit the opposite side with a rubber hammer or the like to force the protrusion 5 into the groove 6. Furthermore, if one of the paving materials 1 develops warping, sink marks, or expansion / contraction due to changes in molding conditions or the characteristics of the material, it may become difficult to insert the protrusion 5 into the groove 6. Furthermore, it is only possible to form a flat pavement surface and cannot be applied to pavement surfaces with uneven slopes.

[0040] In contrast, in the pavement construction method of this embodiment, the pavement material 1 used is configured so that the protrusions 5 and grooves 6 can engage in a non-contact state with gaps C2 to C4 (see Figure 7), so that they can be engaged without problem even if slight "warping," "sinking," or "expansion / contraction" occurs in one or both of the pavement materials 1, and the protrusions 5 and grooves 6 can be engaged without problem even when forming a pavement surface with a varying gradient.

[0041] For example, in a pavement surface having a horizontal plane and an inclined plane with a gradient of 1 / 8, by scraping away a portion of the lower edge of one of the paving materials 1 (for example, the shaded portion shown in Fig. 8(1)), it is possible to realize an engagement state between the ridge portion 5 and the groove portion 6 as shown in Fig. 8(2). Note that in the example of Fig. 8(2), the upper edge of the ridge portion 5 is in line contact with the upper edge of the groove portion 6, but the surfaces are not in contact with each other (surface contact state) (non-surface contact state).

[0042] In this embodiment, the dimension (joint width) of the gap C1 (see FIG. 7) between two adjacent paving materials 1 is set to 2 mm, but can be changed appropriately within the range of 1 to 3 mm. However, since the optimum engagement width (dimension at which the tip of the protrusion 5 enters the groove 6) between the protrusion 5 and the groove 6 is 0.5 to 1.5 mm, when the joint width is set to 1 mm, it is preferable that the protrusion dimension D1 (see FIG. 3) of the protrusion 5 is 1.5 to 2.5 mm, and when the joint width is set to 3 mm, it is preferable that the protrusion dimension D1 of the protrusion 5 is 3.5 to 4.5 mm.

[0043] In this embodiment, the paving material 1 according to the first embodiment shown in Figures 1 to 3 is used as the paving material forming the paved surface, but it is also possible to use a paving material (not shown) having one ridge 5 formed on each of the four side portions 4a to 4d (see Figure 1) and a paving material (not shown) having one groove 6 formed on each of the four side portions 4a to 4d, and to arrange them alternately in a checkerboard pattern. It is also possible to use a paving material (not shown) having one ridge formed on each of two adjacent side portions and one groove formed on each of the remaining two side portions.

[0044] Fourth embodiment Fig. 9 is a cross-sectional view of the end portion of a paving material 1 according to a fourth embodiment of the present invention. As shown in Fig. 9(1), in this paving material 1, the upper edge 6a and the lower edge 6b of the groove 6 protrude outward from the sides 4b, 4d, and the protruding dimension D3 is set to 2 mm. Therefore, as shown in Fig. 9(2), by arranging the upper edge 6a and the lower edge 6b of the groove 6 so as to abut the sides 4a, 4c of the adjacent paving materials 1, a joint width (gap C1) of 2 mm can be formed between the two adjacent paving materials 1.

[0045] In the "pavement surface construction method" of the third embodiment, a pavement material 1 is placed between two pavement materials 1 with a 2 mm thick spacer 17 sandwiched therebetween, and then the spacer 17 is removed to form a 2 mm wide gap C1 (joint); however, by using the pavement material 1 of this embodiment, a joint of appropriate size (with a width equal to the protruding dimension D3 of the upper edge 6a and lower edge 6b) can be easily formed by the method described above without using a spacer.

[0046] Furthermore, when two paving materials 1 are arranged side by side so that their upper surfaces 2 are flush, as shown in Figure 9 (2), the protrusion portion 5 of one paving material 1 can partially penetrate into the groove portion 6 of the other paving material 1, allowing the protrusion portion 5 and the groove portion 6 to engage in a non-contact state.

[0047] Furthermore, as shown in FIG. 10, the paving material 1 of this embodiment allows the protrusions 5 and grooves 6 to engage without any problems even when forming a pavement surface with a varying gradient.

[0048] In this embodiment, the protruding dimension D3 of the upper edge 6a and lower edge 6b of the groove portion 6 is set to 2 mm, but this can be changed appropriately within the range of 1 to 3 mm. In other words, a construction method for a pavement surface with a joint width (the dimension of the gap C1 between two adjacent pavement materials 1) of 1 to 3 mm can be easily carried out. [Explanation of symbols]

[0049] 1: Paving materials, 2:Top part, 3: Bottom part, 4, 4a to 4d: side parts, 5:Protrusion part, 5a: Upper border; 5b: lower edge, 6: Groove, 6a: upper edge, 6b: lower edge, 7: Die, 8: Cut surface, 9: Small pieces, 10: base layer, 11: Sand layer, 12: Curb block, 13: sealing material, 15: Paving blocks, 16: Sand, 17: Spacer, C1~C4: Gap

Claims

1. A paving material having a specific gravity of 1.15 or more, the paving material having horizontal square top and bottom surfaces and four vertical sides, A large number of small grooves are formed on the surface of the upper surface and / or the lower surface, Two of the four side portions are formed with horizontally extending protrusions, and the remaining two side portions are formed with horizontally extending grooves, A paving material characterized in that the height dimension of the groove is set greater than the thickness dimension of the protrusion, and the depth dimension of the groove is set greater than the protrusion dimension of the protrusion, and when two paving materials are arranged with a joint width of 1 to 3 mm so that their upper surfaces are flush, the protrusion of one paving material partially penetrates into the groove of the other paving material, forming gaps between the upper edge of the protrusion of one paving material and the upper edge of the groove of the other paving material, between the lower edge of the protrusion of one paving material and the lower edge of the groove of the other paving material, and between the tip of the protrusion of one paving material and the innermost part of the groove of the other paving material, and the protrusion of one paving material and the groove of the other paving material are configured in a shape and size such that they engage in a non-contact manner.

2. Of the four side portions, two parallel side portions are formed with protrusions, and the remaining two parallel side portions are formed with grooves, 2. The paving material according to claim 1, wherein the small grooves formed on the surface of the upper surface and / or the lower surface extend linearly in a direction parallel to the grooves formed on the side surfaces.

3. A ridge and groove is formed at a mid-height position on each side; 2. The paving material according to claim 1, wherein the thickness of the protrusions is set to 8 mm or more.

4. 2. The paving material according to claim 1, wherein the upper and lower edges of the grooves protrude outward beyond the sides, and the protruding dimension is set within the range of 1 to 3 mm.

5. A method for constructing a pavement surface by regularly arranging the paving material according to any one of claims 1 to 4 on a layer of sand, comprising: A method for constructing a pavement surface, characterized in arranging the paving materials so that the upper surfaces of two adjacent paving materials are flush, so that the side portion with the protrusion of one paving material faces the side portion with the groove of the other paving material, so that a certain gap is formed between the paving materials, so that the protrusion of one paving material partially enters the groove of the other paving material, so that gaps are formed between the upper edge of the protrusion of one paving material and the upper edge of the groove of the other paving material, between the lower edge of the protrusion of one paving material and the lower edge of the groove of the other paving material, and between the tip of the protrusion of one paving material and the innermost part of the groove of the other paving material, and so that the protrusions and grooves engage in a non-contacting state.

6. 6. The method for constructing a pavement according to claim 5, wherein the joint width between two adjacent paving materials is set to a dimension within the range of 1 to 3 mm.

7. 7. The method for constructing a pavement surface according to claim 6, wherein the engagement width between the ridges and grooves is set to a dimension within the range of 0.5 to 1.5 mm.

8. 6. A method for constructing a pavement as claimed in claim 5, characterized in that sand or dry mix mortar is laid, compacted and levelled to form a sand layer, and paving material is then placed thereon.

9. 6. A method for constructing a pavement according to claim 5, further comprising forming a layer of sand on the inner area of ​​curbstone blocks arranged so as to surround the periphery of the pavement to be constructed.

10. A method for producing the paving material according to any one of claims 1 to 4, comprising the steps of: Supply plastic raw materials and auxiliary materials to the extrusion molding machine, A long molded product having grooves on both the left and right sides and a large number of small grooves on the upper and lower surfaces is extruded from the die of the extrusion molding machine. The long molded product is transported while being cooled, and cut in a direction perpendicular to the longitudinal direction by a cutting device. A horizontal cut is made on the cut surface, and then vertical cuts are made on the top and bottom surfaces to cut out two rod-shaped pieces from each cut surface. A method for producing a paving material having horizontally extending ridges on two of its four parallel sides and horizontally extending grooves on the remaining two parallel sides.

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