Block mats and revetment structures

Abstract

We offer block mats that are more resistant to curling due to water flow than ever before. [Solution] A block mat in which a plurality of concrete blocks are fixed to a flexible base sheet, wherein the concrete blocks have a rear end with a higher height and a front end with a lower height, and the concrete blocks are arranged so that the front ends or rear ends abut each other.

Description

Technical Field

[0001] The present invention relates to a block mat and a bank protection structure.

Background Art

[0002] Conventionally, an erosion prevention material called a block mat has been used for the purpose of protecting the slopes of rivers, dams, swimming pools, etc. A block mat is a combination of a large number of concrete blocks integrated with a base sheet made of synthetic fiber non-woven fabric or the like. The block mat has the features of being easy to construct and having excellent durability. Conventional techniques related to bank protection blocks and bank protection structures are disclosed in Patent Document 1 below and the like.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As shown in FIGS. 1 to 3 and 5 to 8 of Patent Document 1, in a bank protection structure, it is common to install bank protection blocks so that the side with a lower height is on the upstream side and the side with a higher height is on the downstream side with respect to the water flow, in order to reduce the resistance of the water.

[0005] However, along with the recent trend of global warming, there has been a phenomenon of concentrated rainfall in a short period of time in various places, and there has been a frequent occurrence of a phenomenon in which water concentrates in rivers in a short period of time and the water flow speeds up. In such a situation, there has also been a frequent occurrence of a phenomenon in which bank protection blocks, block mats, etc. are rolled up, and there has been a greater demand than ever for preventing this.

[0006] Therefore, an object of the present application is to provide a block mat in which the rolling with respect to the water flow is reduced more than ever. [Means for solving the problem]

[0007] As a result of diligent research to achieve the above objectives, the inventors of this invention have found the following: In block mats, when installing concrete blocks, if the taller end of the concrete block is designated as the rear end and the shorter end as the front end, then installing them with the rear ends together and the front ends together can further reduce the lifting of the concrete blocks due to water flow.

[0008] [1] A block mat in which a plurality of concrete blocks are fixed to a flexible base sheet, The concrete block has a rear end with a greater height and a front end with a lower height. A block mat comprising concrete blocks arranged so that their leading ends or trailing ends abut against each other.

[0009] [2] The concrete block has a bottom surface, a top surface, and a side surface connecting the bottom surface and the top surface, The block mat according to [1], wherein the upper surface is inclined to approach the bottom surface as it moves from the rear end towards the front end.

[0010] [3] The block mat according to [1] or [2], wherein the direction connecting the rear end and the front end of the concrete block is the longitudinal direction, and the concrete blocks are arranged such that the front ends or rear ends of adjacent concrete blocks abut against each other in the longitudinal direction.

[0011] [4] The block mat according to any one of [1] to [3], wherein the orientation of the leading edges of adjacent concrete blocks in the longitudinal direction is opposite to that of the others.

[0012] [5] The block mat described in any one of items [1] to [4] is installed such that the longitudinal direction connecting the front and rear ends of the concrete block coincides with the direction of water flow. A revetment structure in which adjacent concrete blocks are arranged with their leading ends and rear ends abutting against each other along the direction of the water flow.

[0013] [6] The revetment structure according to [5], wherein the tips of adjacent concrete blocks are arranged in opposite directions along the direction of the water flow. [Effects of the Invention]

[0014] According to the block mat of the present invention, the lifting of concrete blocks by water flow can be further reduced. [Brief explanation of the drawing]

[0015] [Figure 1] Figures 1(a) and 1(b) are perspective views of one embodiment of the block mat of the present invention. [Figure 2] Figure 2(a) is a perspective view of a concrete block. Figure 2(b) is a top view of two concrete blocks placed with their rear ends butted together. Figure 2(c) is a side view of two concrete blocks placed with their rear ends butted together. [Figure 3] Figure 3 is a conceptual diagram showing the construction of a revetment structure by arranging multiple block mats. [Figure 4] Figure 4 is a schematic diagram showing the drag and lift test conditions, where Figure 4(a) is a schematic diagram of Example 1 and Figure 4(b) is a schematic diagram of Comparative Example 1. [Figure 5] Figure 5(a) is a graph showing the results of the drag-lift test for Example 1, and Figure 5(b) is a graph showing the results of the drag-lift test for Comparative Example 1. [Figure 6] Figure 6(a) is a contour map of the block mat of Example 1, and Figure 6(b) is a contour map of the block mat of Comparative Example 1. [Figure 7]Fig. 7(a) is a schematic diagram showing the state of stacking of the simulated block mats of the present invention, and Fig. 7(b) is a schematic diagram showing the state of stacking of the simulated block mats of the comparative example. [Figure 8] Fig. 8(a) is a schematic diagram showing the state of the stacked simulated block mat of the present invention 1 second after the evaluation of the stacking stability, and Fig. 8(b) is a schematic diagram showing the state of the stacked simulated block mat of the present invention 12 seconds after the evaluation of the stacking stability. Fig. 8(c) is a schematic diagram showing the state of the stacked simulated block mat of the comparative example 1 second after the evaluation of the stacking stability, and Fig. 8(d) is a schematic diagram showing the state of the stacked simulated block mat of the comparative example 2 seconds after the evaluation of the stacking stability. [[ID=?]]

Embodiments for Carrying Out the Invention

[0016] Hereinafter, the present invention will be described in detail.

[0017] Also, when described as "X to Y" (X and Y are arbitrary numbers), unless otherwise specified, it includes the meaning of "X or more and Y or less", and also the meaning of "preferably greater than X" and "preferably less than Y".

[0018] <Block mat> Fig. 1 shows a perspective view of an embodiment of the block mat 100 (100A to 100B) of the present invention. The block mat 100 of the present invention is a block mat in which a plurality of concrete blocks 10 are fixed to a flexible base sheet 20, where the concrete block 10 has a rear end portion 14 with a high height and a front end portion 12 with a low height, and the block mat 100 is formed by arranging the concrete blocks 10 so that the front end portions 12 or the rear end portions 14 are abutted against each other.

[0019] (Base sheet 20) It should be noted that there seems to be an error in the original text where the item number "ID=?" is used instead of a proper number. This has been left as is in the translation for the sake of following the original text exactly.The base sheet 20 in the block mat 100 of the present invention is not particularly limited as long as it has appropriate flexibility and strength as a block mat 100, and various porous sheets, such as nonwoven fabric sheets or woven fabric sheets, can be used.

[0020] As for the woven fabric, it is possible to use fabrics made from synthetic fibers such as polyethylene, polypropylene, and polyester (so-called filter cloths). Furthermore, nonwoven fabrics can be made from synthetic fibers such as polypropylene, polyethylene, polyester, nylon, vinylon, acrylic, and polyurethane, including short fibers. Polypropylene or polyethylene are preferred because they have excellent chemical resistance, as soil improvement materials may contain alkaline substances.

[0021] Furthermore, it is preferable that the base sheet 20 has appropriate tensile strength so that the block mat 100 can be lifted and handled. From this viewpoint, it is preferable that the base sheet 20 is constructed by inserting a woven fabric that serves as a reinforcing core into a nonwoven fabric. A base sheet 20 with such a structure can be manufactured, for example, by integrating the nonwoven fabric with the woven fabric or long fibers by wrapping the woven fabric or long fibers when the nonwoven fabric is made in a papermaking machine, and then reinforcing it by needle punching.

[0022] The thickness of the base sheet 20 is not particularly limited, but can be, for example, 2 mm to 30 mm. A thickness of 2 mm or more makes it easier to ensure tensile strength. On the other hand, a thickness of 30 mm or less provides sufficient strength and is preferable from a cost standpoint.

[0023] Furthermore, the basis weight of the base sheet 20 is, for example, 100 to 900 g / m² in the case of polypropylene. 2 These materials can be used. Furthermore, polyester filament fibers can be arranged in the longitudinal direction of the nonwoven fabric at a predetermined basis weight to reinforce it, for example, 70 to 210 g / m².2 That is the case.

[0024] The fineness of the base sheet 20 is preferably 3.3 dtex or more and 20.0 dtex or less, and short fibers of different fineness can also be mixed and used. By using fine fibers with a fineness of 3.3 dtex or more and less than 6.0 dtex, even with a low basis weight, the fibers are more likely to intertwine, preventing the nonwoven fabric from being transparent. Furthermore, by limiting the opening diameter of the nonwoven fabric to 0.2 mm or less, it is possible to reduce costs by providing an anti-seepage function. By using fibers with a fineness of 6.0 dtex or more, preferably 10.0 dtex or more, the fibers are more likely to stand upright. When bonding with fresh concrete or using an adhesive, the cement paste or adhesive can penetrate between the upright fibers, thereby improving the adhesion between the concrete block and the base sheet. The mixing ratio of fibers with a fineness of 6.0 dtex or more is preferably 15% by weight or more, and more preferably 30% by weight or more.

[0025] Furthermore, the base sheet 20 may have a waterproof sheet on the side opposite to the side on which the concrete block 10 is installed. By having a waterproof sheet on the base sheet 20, when the block mat 100 is laid on a slope or the like, it is possible to suppress water infiltration into the slope or the like.

[0026] The materials constituting the waterproof sheet are not particularly limited as long as they have waterproofing properties. Specific examples of materials constituting the waterproof sheet include ethylene-vinyl acetate copolymer resin, rubber, polyvinyl chloride resin, and polyolefin resin.

[0027] The basis weight of the waterproof sheet is not particularly limited, but for example, a basis weight of 200 g / m² is acceptable. 2 More than 500g / m 2 It is preferable that the resin be composed of the following: The basis weight of the resin constituting the waterproof sheet is 200 g / m². 2 By doing so, it becomes easier to prevent pebbles and other debris from creating holes in the waterproof sheet when the block mat 100 is laid. On the other hand, the basis weight of the resin that makes up the waterproof sheet is 500g / m². 2 By doing the following, it is possible to prevent an increase in the mass of the block mat 100 due to the base sheet 20 becoming thicker than necessary. The thickness of the waterproof sheet is not particularly limited, but it is preferable to configure it to have a thickness of 0.15 mm or more and 2.0 mm or less. Furthermore, the waterproof sheet may have a protective layer approximately 1.0 mm to 10.0 mm thick on the side opposite to the base sheet 20. The protective layer can be selected from film, sheet, woven fabric, nonwoven fabric, etc., with nonwoven fabric being particularly preferred.

[0028] The waterproof sheet has irregularities formed on the side opposite to the base sheet 20. This is preferable. As a result, the static friction coefficient on the slope side of the block mat 100 increases, which prevents the block mat 100 from sliding down when laid on the slope and makes the installation of the block mat 100 easier. The method of forming the unevenness is not particularly limited, and a waterproof sheet with unevenness formed by a known method can be used.

[0029] The block mat 100 of the present invention can be manufactured, for example, using a commercially available waterproof sheet 14. Therefore, depending on the condition of the slope, waterproof sheets of various thicknesses and weights can be selected, and depending on the required level of anti-slip effect, the most suitable waterproof sheet can be selected from waterproof sheets with various uneven shapes.

[0030] Even though the base sheet 20 is equipped with a waterproof sheet, it is not intended to be completely waterproof. Some water is expected to leak through the overlapping parts when multiple block mats 100 are stacked on top of each other, as will be described later, and through the parts where anchor pins are driven in to fix the block mats 100, as will be described later. This design, which allows some water to leak, makes it possible to drain water that has seeped into the embankment or other structure covered with the block mats 100.

[0031] (Concrete block 10) The block mat 100 of the present invention is characterized by the shape of the concrete block 10 that is placed on the base sheet 20 described above. The concrete block 10 has a rear end portion 14 that is taller and a front end portion 12 that is shorter.

[0032] Figure 2(a) shows an example of a concrete block 10. The direction parallel to the bottom surface, from the rear end 14 to the front end 12, is the Y-axis direction, the direction perpendicular to the Y-axis direction is the X-axis direction, and the height direction is the Z-axis direction.

[0033] The concrete block 10 has a bottom surface, a top surface, and a side surface connecting the bottom surface and the top surface, and it is preferable that the Y-axis direction connecting the front end 12 and the rear end 14 is the longitudinal direction and the X-axis direction is the short direction. Furthermore, it is preferable that the upper surface is inclined to approach the bottom surface as it moves from the rear end 14 towards the front end 12.

[0034] The illustrated concrete block 10 has a rectangular bottom surface, a rectangular top surface, and four sides connecting the bottom surface and the top surface. Figure 2(b) shows a view from above of two concrete blocks 10 placed with their rear ends 14 abutting against each other. Figure 2(c) shows a view from the side of the same two concrete blocks 10.

[0035] As shown in Figures 2(b) and (c), multiple protrusions may be formed on the upper surface of the concrete block 10. These protrusions can provide the concrete block 10 with functions such as anti-slip properties. For example, the protrusions can be hemispherical protrusions with a diameter of 20 to 40 mm and a height of 2 to 10 mm. Furthermore, as shown in Figures 2(a) to (c), it is preferable that each corner of the concrete block 10 be chamfered from the viewpoint of improving strength and handling.

[0036] The concrete block 10 has a rear end portion 14 with a higher height and a front end portion 12 with a lower height at both ends in the longitudinal direction, the Y-axis direction. The height of the front end portion 12 is preferably 60 mm or less, more preferably 50 mm or less, even more preferably 40 mm or less, and particularly preferably 30 mm or less. There is no particular lower limit to the height of the front end portion 12, but if the front end is pointed, the strength will decrease and handling during construction will become difficult. Therefore, 5 mm or more is preferred. A thickness of 10 mm or more is more preferable, and 20 mm or more is even more preferable.

[0037] In the configurations shown in Figures 2(a) to 2(c), the tip portion 12 has a side surface 122 connecting the top surface and the bottom surface. However, the tip portion may be pointed without forming this side surface 122. Nevertheless, from the above viewpoint, it is preferable that the tip portion also has a side surface 122 of a predetermined height. The angle α of the tip portion 12 is preferably 10° or more, more preferably 14° or more. Furthermore, it is preferably 40° or less, more preferably 35° or less, even more preferably 30° or less, and particularly preferably 20° or less.

[0038] The height of the rear end portion 14 (the height of the concrete block 10 in the Z direction) is preferably 80 mm or more, more preferably 100 mm or more, and even more preferably 110 mm or more. The upper limit is preferably 150 mm or less, more preferably 140 mm or less, and even more preferably 130 mm or less. The rear end portion 14 always has a side surface 142 that connects the top surface and the bottom surface. In the configuration shown in Figure 2(c), the connection between the side surface 142 and the bottom surface is chamfered. The angle β of the rear end portion 14 is preferably 50° or more, more preferably 55° or more. It is also preferably 80° or less, and more preferably 70° or less.

[0039] From the viewpoint of block stability, the size of the concrete block 10 in the Y direction is preferably 200 mm or more, more preferably 300 mm or more, even more preferably 350 mm or more, and particularly preferably 380 mm or more. Furthermore, from the viewpoint of preventing the block from becoming too heavy, the upper limit is preferably 500 mm or less, more preferably 450 mm or less, and even more preferably 420 mm or less.

[0040] From the viewpoint of block stability, the size of the concrete block 10 in the X direction is preferably 150 mm or more, and more preferably 180 mm or more. Furthermore, from the viewpoint of preventing the block from becoming too heavy, the upper limit is preferably 300 mm or less, and more preferably 250 mm or less.

[0041] (Arrangement of concrete blocks 10) It is preferable to arrange the concrete blocks 10 so that their front ends 12 or rear ends 14 are abutting against each other, as shown in Figures 1(a) to (b).

[0042] In the configuration shown in Figure 1(a), the concrete blocks 10 are arranged in a butted configuration from right to left in the direction of illustration, with their front ends 12 facing each other, their rear ends 14 facing each other, and then their front ends 12 facing each other again. Four concrete blocks 10 are arranged in the Y-axis direction, and three concrete blocks 10 are arranged in the X-axis direction. The number of concrete blocks 10 in the X-axis direction can be, for example, preferably 5 or more, more preferably 8 or more, and even more preferably 10 or more, and can be adjusted to match the width of the slope on which they are installed. The configuration shown in Figure 1(a), in which four concrete blocks 10 are arranged in the Y-axis direction, is the most typical configuration of the block mat of the present invention.

[0043] In the configuration shown in Figure 1(b), the concrete blocks 10 are arranged so that their front ends 12 and rear ends 14 are butted together, starting from the right side in the illustrated direction. In this configuration, three concrete blocks 10 are arranged in the Y-axis direction, and the tip 12 of the concrete blocks 10 is positioned at one end in the Y-axis direction. The number of concrete blocks 10 to be placed in the X direction is the same as in the case of the block mat 100A described above. As will be explained later, this block mat 100B is positioned at the end of the revetment structure in the direction of flow, with the tip portion 12 being the end of the revetment structure.

[0044] When the direction connecting the rear end portion 14 and the front end portion 12 of the concrete block 10 (Y-axis direction) is defined as the longitudinal direction, it is preferable to arrange the concrete blocks 10 so that the front ends 12 or rear ends 14 of adjacent concrete blocks 10 abut against each other in the longitudinal direction.

[0045] From another perspective, regarding the arrangement of the concrete blocks 10 in the Y-axis direction of the block mat 100, it is preferable to arrange them so that the orientations of the leading edges 12 of adjacent concrete blocks 10 are opposite to each other.

[0046] In the X-axis direction of the block mat 100, it is preferable to arrange the concrete blocks 10 with their leading edges 12 aligned in the same direction, as shown in Figures 1(a) and 1(b).

[0047] <Method for manufacturing block mat 100> The block mat 100 of the present invention can be manufactured by filling a predetermined mold with concrete and impregnating a portion of the bottom surface of the concrete block 10 before it hardens into the base sheet 20, thereby integrating the concrete block 10 and the base sheet 20. Alternatively, the concrete block 10 and the base sheet 20 may be integrated using an adhesive. In this case, the waterproof sheet on the back of the base material may also be integrated using an adhesive.

[0048] Alternatively, the waterproofing sheet on the back of the base layer may be formed on the side of the base sheet 20 opposite to the concrete block 10 by spraying a resin emulsion or by resin coating to create a waterproofing layer.

[0049] <Seawall Structure> The block mat 100 of the present invention can be used to protect a slope from river water flow. The slope may be either the slope on the land side outside the embankment or the slope on the land side inside the embankment. Note that "land side outside the embankment" means the river side (river face side), and "land side inside the embankment" means the urban area side (river back side).

[0050] In the revetment structure of the present invention, the block mat 100 of the present invention may be laid over the entire slope, or, considering cost and other factors, it may be laid over a part of the slope (for example, the slope on the landward side of the embankment). In this way, by laying the block mat 100 of the present invention at least on the slope on the landward side of the embankment, it is possible to prevent flooding onto the slope and protect the slope when the river has a normal flow.

[0051] Furthermore, the block mat 100 of the present invention can be used to protect the inner slope of a river embankment from river overflow. In this case, the block mat 100 may be laid over the entire inner slope of the river embankment, or, considering cost and other factors, the revetment block mat 100 may be laid over only a portion of the inner slope.

[0052] When laying the block mat 100 of the present invention on a slope, it is preferable to drive anchor pins or the like into the base sheet 20 of the block mat 100 in order to fix the block mat to the slope.

[0053] The revetment structure of the present invention is installed such that the block mat 100 described above is installed such that the longitudinal direction connecting the front end 12 and the rear end 14 of the concrete block 10 coincides with the direction of water flow. This is a revetment structure in which adjacent concrete blocks 10 are arranged with their front ends 12 and rear ends 14 abutting against each other along the direction of water flow.

[0054] "The concrete block 10 is installed so that the longitudinal direction connecting the front end 12 and the rear end 14 coincides with the direction of water flow" means that multiple block mats 100 are installed along the direction of water flow so that the Y-axis direction of the block mats 100 in Figures 1(a) to (b) coincides with the direction of water flow. Here, "matching the direction of water flow" does not mean that the direction of water flow and the Y-axis direction of the block mat 100 must be strictly aligned. The axes may be offset by a range of preferably ±45° or less, more preferably ±30° or less, even more preferably ±20° or less, and particularly preferably ±10° or less.

[0055] When viewing the revetment structure of the present invention along the direction of water flow (Y-axis direction), adjacent concrete blocks 10 are arranged with their front ends 12 and rear ends 14 abutting against each other, and it is preferable that all adjacent concrete blocks 10 are arranged with their front ends 12 and rear ends 14 abutting against each other. From another perspective, it is preferable that the tip portions 12 of adjacent concrete blocks 10 are arranged in opposite directions along the water flow direction (Y-axis direction), and it is preferable that the tip portions 12 of all adjacent concrete blocks 10 are arranged in opposite directions along the water flow direction (Y-axis direction).

[0056] In the revetment structure of the present invention, it is preferable to arrange a block mat 100C as shown in Figure 3, so as to position the tip portion 12 of the concrete block 10 at the upstream end in the water flow direction (Y-axis direction). Furthermore, it is preferable to place the block mat 100B at the downstream end in the direction of water flow (Y-axis direction) so as to position the tip portion 12 of the concrete block 10. [Examples]

[0057] <Drag and lift tests> Using fluid dynamics analysis software (Flow-3D, Flow Science Japan), drag and lift tests were performed on the block mat of Example 1 (Figure 4(a)) and the block mat of Comparative Example 1 (Figure 4(b)). The drag coefficient and lift coefficient were calculated for the first, second, third, and fourth stages, starting from the upstream side in the direction of water flow. The tests were conducted on a 2 / 3 scale block.

[0058] The test conditions are as follows: (Shape and size of each block) Each block used had the shape shown in Figure 2. Y-direction length: 394mm x 2 / 3 X-direction length: 194mm x 2 / 3 Z-direction height: 120mm x 2 / 3 Tip height: 30mm x 2 / 3 Angle α: 14.5° Angle β:66.1°

[0059] (Test conditions) Water velocity: 0.6m / s Water depth: 300mm

[0060] The measurement results for Example 1 are shown in Figure 5(a), and the measurement results for Comparative Example 1 are shown in Figure 5(b). Comparing the results of Example 1 and Comparative Example 1, no significant difference was observed in the lift coefficient. However, in terms of the drag coefficient, it was found that in the block mat of the present invention (Example 1), in which the blocks were arranged alternately along the water flow direction, the drag coefficient of the first stage was small, and the drag coefficient in the subsequent stages gradually decreased. In contrast, in the comparative example block mat (Comparative Example 1), in which the blocks were arranged in the same direction along the water flow direction, the drag coefficient of the first stage was large, and the drag coefficient in the subsequent stages gradually increased. Thus, it has been demonstrated that the block mat and revetment structure of the present invention have a high effect in suppressing block peeling.

[0061] <Contour diagram of flow velocity> Furthermore, Figure 6 shows the flow velocity contours obtained by measuring the flow velocity around the block mat of Example 1 and Comparative Example 1 described above. The test conditions were the same as described above.

[0062] The results of Example 1 are shown in Figure 6(a), and the results of Comparative Example 1 are shown in Figure 6(b). In Figure 6(a), the lighter-colored bars at the top indicate areas with high flow velocity, while the darker-colored bars on the left indicate areas with low flow velocity. Furthermore, in Figure 6(b), the lighter-colored bars on the right indicate areas with high flow velocity, while the darker-colored bars on the left indicate areas with low flow velocity. As shown in Figure 6(b), in Comparative Example 1, a vortex with a high flow velocity is generated at the rear end of the block, which increases the drag force. In contrast, as shown in Figure 6(a), in Example 1, the generation of vortices at the rear end of the block is suppressed, and it can be seen that there is less turbulence in the water flow throughout the block mat.

[0063] <Stacking Test> Figure 7(a) shows a schematic diagram of a 10-tier stack of the simulated block mat (scale 1 / 5) of the present invention, with the leading and trailing ends of the blocks butted together. The simulated block mat has a shape that is 1 / 5 the size of the block shown in Figure 2 above. Y-direction length: 394mm × 1 / 5 Length in X direction: 194mm × 1 / 5 Z-direction height: 120mm x 1 / 5 Tip height: 30mm x 1 / 5

[0064] The simulated block mat consists of four blocks made of acrylonitrile-styrene-acrylic acid polymer, connected in the Y-axis direction by attaching them to a 0.6 mm thick sheet of paper with double-sided tape. The shape of each block is as described above. Furthermore, Figure 7(b) shows a schematic diagram of a comparative example of a simulated block mat, where the blocks are arranged in the same direction along the Y-axis, stacked 10 layers high.

[0065] The test specimens, stacked in the 10 layers described above, were shaken under conditions of a horizontal displacement of 20 mm / second to evaluate their load stability. The results for the test specimen of the present invention after 1 second of displacement are shown in Figure 8(a), and the results after 12 seconds are shown in Figure 8(b). For the comparative example specimen, the results after 1 second of displacement are shown in Figure 8(c), and the results after 2 seconds are shown in Figure 8(d). From the above, it has been shown that the block mat of the present invention has excellent stability when stacked.

Claims

1. A block mat in which multiple concrete blocks are fixed to a flexible base sheet, The concrete block has a rear end with a greater height and a front end with a lower height. A block mat comprising concrete blocks arranged so that their leading ends or trailing ends abut against each other.

2. The concrete block has a bottom surface, a top surface, and a side surface connecting the bottom surface and the top surface. The block mat according to claim 1, wherein the upper surface is inclined to approach the bottom surface as it moves from the rear end towards the front end.

3. The block mat according to claim 1, wherein, when the direction connecting the rear end and the front end of the concrete block is the longitudinal direction, the concrete blocks are arranged such that the front ends or rear ends of adjacent concrete blocks abut against each other in the longitudinal direction.

4. The block mat according to claim 1, wherein the orientation of the leading edges of adjacent concrete blocks in the longitudinal direction is opposite to that of the others.

5. The block mat according to any one of claims 1 to 4 is installed such that the longitudinal direction connecting the front and rear ends of the concrete block coincides with the direction of water flow. A revetment structure in which adjacent concrete blocks are arranged with their leading ends and rear ends abutting against each other along the direction of the water flow.

6. The revetment structure according to claim 5, wherein the tips of adjacent concrete blocks are arranged in opposite directions along the direction of the water flow.

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