Hollow Block

Abstract

To provide a concrete block improved in strength while improving porosity.SOLUTION: A concrete block has four column parts 20 each having a lower end, and four lower connection parts 30 for erecting the four column parts at predetermined intervals and connecting lower parts of the four column parts to each other, and the four column parts 20 further have projecting parts 22 projecting downward from the lower connection parts.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a hollow block having a hollow space inside a block body made of a hexahedron and having openings on all or some of the six faces that communicate the hollow space with the outside of the block body. [Background technology]

[0002] There is a concrete hollow block that has a hollow space inside the cubic block body and has circular openings on all or some of its six faces that connect the hollow space to the outside of the block body, and it is sold under the product name POKARA. Hollow blocks like POKARA have a void ratio of about 73% and have the advantage of being lightweight, but on the other hand, when weight is required, it is possible to fill the inside with soil or concrete.

[0003] For example, Japanese Patent Application Laid-Open No. 11-5205 discloses an example of such a hollow block, which is a "concrete block made of polyhedron having six or more outer faces, having a hollow portion inside that communicates with two or more of the outer faces, wherein the hollow portion is formed by using a plurality of split cores that can be removed after the concrete has hardened."

[0004] On the other hand, in recent years, floods have become more frequent, so water storage facilities have been constructed in vacant lots. However, because there is little vacant land, for example, the basement of a parking lot has been used as a water storage facility. In this case, attempts are being made to pile up the abovementioned blocks underground and use the gaps between them as a water storage facility, while using the aboveground as a parking lot.

[0005] However, in concrete blocks, improving the porosity and strength of the concrete block are not compatible. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 11-5205 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0007] SUMMARY OF THE PRESENT EMBODIMENT The present invention has been made in consideration of the above-mentioned points, and an object of the present invention is to provide a concrete block which has improved strength while increasing the porosity. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the concrete block of a first aspect has four pillar portions, each having a lower end, and four lower connecting portions that erect the four pillar portions at a predetermined interval and connect the lower parts of the four pillar portions to each other, and the four pillar portions further have protrusions that protrude downward beyond the lower connecting portions.

[0009] In addition, the concrete block of the second aspect is such that, in the first aspect, the four pillar portions further have upper portions and have four upper connecting portions that connect the upper portions of the four pillar portions to each other, and the four pillar portions, the four lower connecting portions, and the four upper connecting portions are connected to each other, forming a hexahedral shape with six openings, and the six openings are connected to each other.

[0010] In addition, the concrete block of a third aspect is the same as that of the second aspect, wherein the opening has a rectangular shape when viewed from the front, and further has arc-shaped corners at the corners of the rectangular shape.

[0011] In addition, the concrete block of a fourth aspect is the concrete block of the second or third aspect, further comprising a blocking portion that blocks one of the six openings.

[0012] In addition, the concrete block of a fifth aspect is the concrete block of the second or third aspect, further comprising a blocking portion that blocks two adjacent openings of the six openings.

[0013] In addition, the concrete block of a sixth aspect is the concrete block of the second or third aspect, further comprising closing portions that close three of the six openings that are adjacent to each other. Effect of the Invention

[0014] Since the present invention is constructed and operates as described above, it is possible to provide a concrete block having improved strength while also improving the porosity. [Brief description of the drawings]

[0015] [Figure 1] 1A is a perspective view of the concrete block of the first embodiment, and FIG. 1B is a front view of the concrete block of the first embodiment. [Diagram 2] 1A is a plan view of the concrete block of the first embodiment, and FIG. 1B is a bottom view of the concrete block of the first embodiment. [Diagram 3] 1A is a perspective view of a concrete block according to a second embodiment, and FIG. 1B is a front view of the concrete block according to the second embodiment. [Figure 4] 1A is a plan view of the concrete block of the second embodiment, and FIG. 1B is a bottom view of the concrete block of the second embodiment. [Diagram 5] 1A is a right side view of the concrete block of the second embodiment, and B is a left side view of the concrete block of the second embodiment. [Figure 6] 1A is a perspective view of a concrete block according to a third embodiment, and FIG. 1B is a front view of the concrete block according to the third embodiment. [Figure 7] 1A is a plan view of the concrete block of the third embodiment, and FIG. 1B is a bottom view of the concrete block of the third embodiment. [Figure 8]1A is a perspective view of a concrete block according to a fourth embodiment, and FIG. 1B is a front view of the concrete block according to the fourth embodiment. [Figure 9] 1A is a plan view of the concrete block of the fourth embodiment, and FIG. 1B is a bottom view of the concrete block of the fourth embodiment. [Figure 10] 5A is a perspective view of the concrete block of the fifth embodiment, and FIG. 5B is a front view of the concrete block of the fifth embodiment. [Figure 11] 1A is a plan view of the concrete block of the fifth embodiment, and FIG. 1B is a bottom view of the concrete block of the fifth embodiment. [Figure 12] 5A is a right side view of the concrete block of the fifth embodiment, and B is a left side view of the concrete block of the fifth embodiment. [Figure 13] 13A is a perspective view of the concrete block of the sixth embodiment, and FIG. 13B is a front view of the concrete block of the sixth embodiment. [Figure 14] 13A is a plan view of the concrete block of the sixth embodiment, and FIG. 13B is a bottom view of the concrete block of the sixth embodiment. [Figure 15] 13A is a right side view of the concrete block of the sixth embodiment, and B is a left side view of the concrete block of the sixth embodiment. [Figure 16] 1A is a perspective view of a concrete block according to a seventh embodiment, and FIG. 1B is a front view of the concrete block according to the seventh embodiment. [Figure 17] 13A is a plan view of the concrete block of the seventh embodiment, and FIG. 13B is a bottom view of the concrete block of the seventh embodiment. [Figure 18] 13A is a right side view of the concrete block of the seventh embodiment, and B is a left side view of the concrete block of the seventh embodiment. [Figure 19] 13A is a perspective view of the concrete block of the eighth embodiment, and FIG. 13B is a front view of the concrete block of the eighth embodiment. [Figure 20]13A is a plan view of the concrete block of the eighth embodiment, and FIG. 13B is a bottom view of the concrete block of the eighth embodiment. [Figure 21] 13A is a right side view of the concrete block of the eighth embodiment, B is a left side view of the concrete block of the eighth embodiment, and C is a rear view of the concrete block of the eighth embodiment. [Figure 22] A is a plan view of the slab, and B is a side view of the slab. [Figure 23] This is a plan view of a water-storing parking lot with blocks arranged in it. [Figure 24] 23A is a cross-sectional view taken along line AA in Fig. 23. B is a cross-sectional view taken along line BB in Fig. 23. [Diagram 25] This is a plan view of another embodiment of a parking lot that stores water and has blocks arranged therein. [Figure 26] 25A is a cross-sectional view taken along line CC in Fig. 25. And B is a cross-sectional view taken along line DD in Fig. 25. [Figure 27] A is a side view of the first embodiment of the concrete block with partition plates arranged thereon. B is a side view of a retaining wall made by piling up concrete blocks with partition plates arranged thereon. C is a side view of a retaining wall made by piling up concrete blocks with partition plates arranged thereon according to another embodiment. BEST MODE FOR CARRYING OUT THEINVENTION

[0016] A concrete block 10 according to a first embodiment will be described below with reference to the illustrated embodiment. The concrete block 10 has a substantially cubic shape and includes four columnar pillar portions 20 and four columnar lower connecting portions 30. The concrete block 10 also includes four columnar upper connecting portions 40. The porosity of the concrete block 10 according to the first embodiment is 83 percent.

[0017] The four pillars 20 are literally pillars, and are erected at a predetermined interval so as to form corners of a substantially square shape in plan view. Each of the four pillars 20 has a lower part 21 below it. Each of the four pillars 20 also has a protruding part 22 that protrudes further downward from the lower part 21. Each of the four pillars 20 also has an upper part 23 above it.

[0018] The four lower connecting portions 30 connect the lower portions 21 of the column portions 20 to each other. The four column-shaped upper connecting portions 40 connect the upper portions 23 of the column portions 20 to each other. In this manner, the concrete block 10 has four column-shaped column portions 20, four column-shaped lower connecting portions 30, and four column-shaped upper connecting portions 40, which are integrally molded as described above, so that the concrete block 10 has a hexahedral shape. The upper connecting portions 40 and the upper portions 23 of the column portions 20 are configured to be flush with each other.

[0019] The concrete block 10 has a hexahedral shape formed by integrally molding the four columnar columns 20, the four columnar lower connecting sections 30, and the four columnar upper connecting sections 40 as described above. The hexahedral concrete block 10 also has an opening 60 on each face.

[0020] The opening 60 is arranged so as to communicate with the inside of the concrete block 10. That is, when the concrete block 10 is placed in water, the water can flow into the inside through the opening 60. The opening 60 has a rectangular shape with rounded corners when viewed from the front. In order to achieve this rounded shape, the connecting portion between the four columnar parts 20, the four columnar lower connecting parts 30, and the four columnar upper connecting parts 40 has a fillet part 70. That is, each opening 60 has a rectangular shape when viewed from the front, and has an arc-shaped fillet part 70 at each corner of the rectangular shape. Since the corners are arc-shaped, the strength is maintained, and the porosity is improved from the conventional one as described above, ensuring the amount of water storage.

[0021] The upper connecting portion 40 has a hole P for inserting a joint pin, which is arranged to align the multiple concrete blocks 10 when they are stacked. Therefore, by inserting a joint pin (not shown) into the hole P of each of the multiple concrete blocks 10, the multiple concrete blocks 10 are prevented from shifting in position.

[0022] As described above, the concrete block 10 of the first embodiment has four protrusions 22 (see FIG. 1). The protrusions 22 are located directly below the column 20. Therefore, when the concrete blocks 10 of the first embodiment are stacked up, the weight of the concrete block 10 located above is supported by the concrete block 10 located below, and the weight of the concrete block 10 located above is supported by the column 20 of the concrete block 10 below through the four protrusions 22. Since the column 20 literally functions as a concrete column, the protrusions 22 allow it to withstand the compressive load of the weight of the concrete block 10 located above. Therefore, while maintaining strength, the porosity is improved from that of the conventional one as described above, and the amount of water stored is secured.

[0023] Next, a concrete block 120 according to the second embodiment will be described. The same components as those in the concrete block 10 according to the first embodiment will be given the same reference numerals and the description thereof will be omitted.

[0024] The concrete block 120 of the second embodiment further has a blocking portion 121 that blocks the opening. That is, the concrete block 120 has a total of five openings 60. Specifically, the blocking portion 121 blocks the opening surrounded by the upper connecting portion 40a, the two pillar portions 20a, and the lower connecting portion 30a. That is, the blocking portion 121 is integrally formed with the upper connecting portion 40a, the two pillar portions 20a, and the lower connecting portion 30a. In this way, the blocking portion 121 is disposed on the side of the concrete block 120 of the second embodiment.

[0025] The above-mentioned blocking portion 121 may become a wall surface when the concrete block 120 is applied to an underground regulating pond, for example, as described later.

[0026] Moreover, the concrete block 120 of the second embodiment has two protrusions 22 (see FIG. 4B). Also, the lower part of the blocking part 121 has a blocking protrusion 122 that protrudes downward. The protrusion 22 is disposed directly below the above-mentioned column part 20. Also, the blocking protrusion 122 is disposed below the blocking part 121 that is integral with the two column parts 20a. Therefore, when the concrete blocks 120 are stacked up and down, the weight of the concrete block 120 located above is supported by the concrete block 120 located below, and at that time, the weight of the concrete block 120 located above is supported by the concrete block 120 located below through the above-mentioned two protrusions 22 and the blocking protrusion 122. The pillar 20 literally functions as a concrete pillar, and the blocking part 121 is also made of concrete, so that it can withstand the compressive load of the weight of the concrete block 120 located above it by having the protruding part 22 and the blocking protruding part 122. Therefore, while maintaining strength, the porosity is improved compared to conventional ones as described above, and the amount of water stored is secured.

[0027] Next, a concrete block 130 according to a third embodiment will be described. The same components as those in the concrete block 10 according to the first embodiment will be given the same reference numerals and the description thereof will be omitted.

[0028] The concrete block 130 of the third embodiment has a second blocking portion 131 that blocks the opening. That is, the concrete block 130 has a total of five openings 60. Specifically, the blocking portion 131 blocks the opening surrounded by the four upper connecting portions 40b. Therefore, the blocking portion 131 is configured integrally with the four upper connecting portions 40b. In this way, the second blocking portion 131 blocks the opening arranged in what is called the ceiling portion of the concrete block 13 of the third embodiment.

[0029] The above-mentioned second blocking portion 131 is a portion that becomes a ceiling when, for example, the concrete block 130 is applied to an underground regulating pond as described later.

[0030] The second closing portion 131 also has cutout portions 132, 132 at both ends, which are used to place a flat slab 400 serving as a lid, which will be described later.

[0031] The above-mentioned closing portion 131 is a portion that becomes a ceiling when this concrete block 130 is applied to an underground regulating pond, for example, as described below.

[0032] The concrete block 130 of the third embodiment has four protrusions 22 (see FIG. 7B), similar to the concrete block 10 of the first embodiment. The protrusions 22 are located directly below the column 20. Therefore, when the concrete blocks 130 of the third embodiment are stacked up, the weight of the concrete block 130 located above is supported by the concrete block 130 located below, and the weight of the concrete block 130 located above is supported by the column 20 of the concrete block 130 below through the four protrusions 22. Since the column 20 literally functions as a concrete column, the protrusions 22 allow it to withstand the compressive load of the weight of the concrete block 130 located above. Therefore, while maintaining strength, the porosity is improved from that of the conventional one, as described above, and the amount of water stored is secured.

[0033] Next, a concrete block 140 according to the fourth embodiment will be described. The same components as those in the concrete block 10 according to the first embodiment will be given the same reference numerals and the description thereof will be omitted.

[0034] The concrete block 140 of the fourth embodiment further has a third blocking portion 141 that blocks the opening. That is, the concrete block 140 has a total of five openings 60. Specifically, the blocking portion 141 blocks the opening surrounded by the four upper connecting portions 40c. In this way, the third blocking portion 141 blocks the opening arranged in what is called the ceiling portion of the concrete block 140 of the fourth embodiment.

[0035] The above-mentioned third blocking portion 141 is a portion that becomes a ceiling when, for example, the concrete block 130 is applied to an underground regulating pond as described later.

[0036] Also, a cutout portion 142 having a cutout shape is provided around the third closing portion 141 so as to surround the third closing portion 141. The cutout portion 142 is used for placing a flat slab 400 as a lid, which will be described later.

[0037] The above-mentioned closing portion 141 is a portion that becomes a ceiling when this concrete block 130 is applied to an underground regulating pond, for example, as described below.

[0038] The concrete block 140 of the fourth embodiment has four protruding parts 22 (see FIG. 9B), similar to the concrete block 10 of the first embodiment. The protruding parts 22 are arranged directly below the column part 20. Therefore, when the concrete blocks 140 of the fourth embodiment are stacked up, the weight of the concrete block 140 located above is supported by the concrete block 140 located below, and the weight of the concrete block 140 located above is supported by the column part 20 of the concrete block 140 below through the four protruding parts 22. Since the column part 20 literally functions as a concrete column, by having the protruding parts 22, it can withstand the compressive load of the weight of the concrete block 140 located above. Therefore, while maintaining strength, the porosity is improved from that of the conventional one, as described above, and the amount of water stored is secured.

[0039] Next, a concrete block 200 according to the fifth embodiment will be described. The same components as those in the concrete block 10 according to the first embodiment will be given the same reference numerals and the description thereof will be omitted.

[0040] The concrete block 200 of the fifth embodiment further has a fourth closing portion 201 that closes two openings. That is, the concrete block 200 has a total of four openings 60. Specifically, the fourth closing portion 201 is integral with two upper connecting portions 40d, three column portions 20d, and two lower connecting portions 30d, and closes two openings surrounded by the two upper connecting portions 40d, the three column portions 20d, and the two lower connecting portions 30d. In addition, the fourth closing portion 201 has a right-angled L-shape in a plan view. In this way, the fourth closing portion 201 closes two openings arranged on the side portions adjacent to each other in the concrete block 200 of the fifth embodiment.

[0041] The fourth blocking part 201 has a fourth protruding part 222 that protrudes downward at its lower part. This will be described later.

[0042] The above-mentioned closing portion 201 is a portion that becomes a retaining wall when this concrete block 120 is applied to an underground regulating pond, for example, as described later.

[0043] Moreover, the concrete block 200 of the fifth embodiment has one protrusion 22 (see FIG. 11B). Also, the fourth blocking portion 201 has a fourth protrusion 222 that protrudes downward at its lower portion. The protrusion 22 is disposed directly below the above-mentioned column portion 20. Also, the fourth protrusion 222 is disposed at the lower portion of the fourth blocking portion 201 that is integral with the two column portions 20d. Therefore, when the concrete blocks 200 are stacked up and down, the weight of the concrete block 200 located above is supported by the concrete block 200 located below, and at that time, the weight of the concrete block 200 located above is supported by the concrete block 200 located below through the above-mentioned two protrusions 22 and the fourth protrusion 222. The pillar 20 literally functions as a concrete pillar, and the fourth blocking part 201 is also made of concrete, so that the protrusion 22 and the fourth protrusion 222 can withstand the compressive load of the weight of the concrete block 200 located above. Therefore, while maintaining strength, the porosity is improved compared to the conventional one as described above, and the amount of water stored is secured.

[0044] Next, a concrete block 260 according to the sixth embodiment will be described. The same components as those in the concrete block 10 according to the first embodiment will be given the same reference numerals and the description thereof will be omitted.

[0045] The concrete block 260 of the sixth embodiment further has a sixth blocking portion 261 that blocks two openings. That is, the concrete block 260 has a total of four openings 60. Specifically, the sixth blocking portion 261 is integral with the four upper connecting portions 40e, the two column portions 20e, and the lower connecting portion 30e, and blocks two openings surrounded by the four upper connecting portions 40e, the three column portions 20e, and the lower connecting portion 30e. In this way, the sixth blocking portion 261 blocks two openings arranged in the ceiling portion and the side portion adjacent to each other of the concrete block 260 of the sixth embodiment. Also, the sixth blocking portion 261 has a right-angled L-shape in a side view.

[0046] The sixth closing portion 261 has a sixth protruding portion 262 protruding downward at its lower portion. This will be described later. The sixth closing portion 261 also has a sixth cutout portion 263 having a notch shape. This is for placing a flat slab 400 as a lid, which will be described later.

[0047] The sixth blocking portion 261 described above is a portion that becomes a retaining wall when the concrete block 120 is applied to an underground regulating pond, for example, as described later.

[0048] Moreover, the concrete block 260 of the sixth embodiment has one protrusion 22 (see FIG. 14B). Also, the sixth blocking portion 261 has a sixth protrusion 262 protruding downward from the lower portion thereof. The protrusion 22 is disposed directly below the above-mentioned column portion 20. Also, the sixth protrusion 262 is disposed below the sixth blocking portion 261 which is integral with the two column portions 20e. Therefore, when the concrete blocks 260 are stacked up and down, the weight of the concrete block 260 located above is supported by the concrete block 260 located below, and at that time, the weight of the concrete block 260 located above is supported by the concrete block 260 located below through the above-mentioned two protrusions 22 and the sixth protrusion 262. The pillar 20 literally functions as a concrete pillar, and the sixth blocking part 261 is also made of concrete, so that the protrusion 22 and the sixth protrusion 262 can withstand the compressive load of the weight of the concrete block 260 located above. Therefore, while maintaining strength, the porosity is improved compared to the conventional one as described above, and the amount of water stored is secured.

[0049] Next, a concrete block 300 according to the seventh embodiment will be described. The same components as those in the concrete block 10 according to the first embodiment will be given the same reference numerals and the description thereof will be omitted.

[0050] The concrete block 300 of the seventh embodiment further has a seventh closing portion 301 that closes three openings. That is, the concrete block 300 has a total of three openings 60. Specifically, the seventh closing portion 301 is integrated with the four upper connecting portions 40f, the three column portions 20f, and the two lower connecting portions 30f, and closes the three openings surrounded by the four upper connecting portions 40f, the three column portions 20f, and the two lower connecting portions 30f. In this way, the seventh closing portion 301 closes three openings arranged in the ceiling portion and two side portions adjacent to each other of the concrete block 300 of the seventh embodiment.

[0051] The seventh blocking portion 301 has a seventh protruding portion 302 protruding below it. This will be described later. The seventh blocking portion 301 is a portion that becomes a ceiling or a retaining wall when the concrete block 301 is applied to an underground reservoir, for example, as will be described later.

[0052] Moreover, the concrete block 300 of the seventh embodiment has one protrusion 22 (see FIG. 17B). It also has a seventh protrusion 302 protruding below the seventh closing part 301. The protrusion 22 is disposed directly below the above-mentioned column part 20. The seventh protrusion 302 is disposed at the lower part of the seventh closing part 301 that is integral with the three column parts 20f. Therefore, when the concrete blocks 300 are stacked up and down, the weight of the concrete block 300 located above is supported by the concrete block 300 located below, and at that time, the weight of the concrete block 300 located above is supported by the concrete block 300 located below through the above-mentioned one protrusion 22 and the seventh protrusion 302. Since the pillar 20 literally functions as a concrete pillar, and the seventh protruding part 302 is also made of concrete, the pillar 20 can withstand the compressive load of the weight of the concrete block 300 located above it by having the protruding part 22 and the seventh protruding part 302. Therefore, while maintaining strength, the porosity is improved compared to conventional ones as described above, and the amount of water stored is secured.

[0053] Next, a concrete block 380 of the eighth embodiment will be described. The concrete block 380 of the eighth embodiment is almost the same as the concrete block 300 of the seventh embodiment, and differs in that an eighth closing portion 381 has an eighth cutout portion 383. Note that the same components as the concrete block 10 of the first embodiment are given the same reference numerals and their description will be omitted.

[0054] The concrete block 380 of the eighth embodiment has an eighth closing portion 381 that closes three openings. That is, the concrete block 380 has a total of three openings 60. Specifically, the eighth closing portion 381 is integrated with four upper connecting portions 40g, three pillar portions 20g, and two lower connecting portions 30g, and closes three openings surrounded by the four upper connecting portions 40g, the three pillar portions 20g, and the two lower connecting portions 30g. In this way, the eighth closing portion 381 closes three openings arranged in the ceiling portion and two side portions adjacent to each other of the concrete block 380 of the eighth embodiment.

[0055] It has an eighth protruding portion 382 that protrudes below the eighth closing portion 381. This will be described later. The above-mentioned eighth closing portion 381 is a portion that becomes a ceiling when this concrete block 301 is applied to an underground regulating pond, for example, as described later (see FIG. 25).

[0056] Moreover, the concrete block 380 of the eighth embodiment has one protrusion 22 (see FIG. 20B). It also has an eighth protrusion 382 protruding below the eighth closing part 381. The protrusion 22 is disposed directly below the above-mentioned column part 20. The eighth protrusion 382 is disposed below the eighth closing part 381 that is integral with the three column parts 20g. Therefore, when the concrete blocks 380 are stacked up and down, the weight of the concrete block 380 located above is supported by the concrete block 380 located below, and at that time, the weight of the concrete block 380 located above is supported by the concrete block 380 located below through the above-mentioned one protrusion 22 and the eighth protrusion 382. Since the pillar 20 literally functions as a concrete pillar, and the eighth protruding portion 382 is also made of concrete, the pillar 20 can withstand the compressive load of the weight of the concrete block 380 located above it by having the protruding portion 22 and the eighth protruding portion 382. Therefore, while maintaining strength, the porosity is improved compared to conventional ones as described above, and the amount of water stored is secured.

[0057] Next, the slab 400 will be described. The slab 400 is placed to fill the gaps between the concrete blocks when placing the concrete blocks described above, and is placed so as to engage with the notches described above. The slab 400 has a flat plate shape, and has notch receiving portions 401 at both ends that engage with the respective notches described above. The width or depth of the slab 400 can be appropriately sized depending on the gaps between the concrete blocks.

[0058] As shown in the figure, the underground regulating ponds 800, 801 are constructed by stacking a number of concrete blocks of any of the above-mentioned types and blocking the upper part of the concrete blocks with a number of slabs 400. In this case, the concrete blocks have a high porosity, so the water storage rate can be improved. In addition, since the concrete blocks have the above-mentioned protrusions 22 or each blocking protrusion, they can maintain their strength even when stacked.

[0059] Furthermore, by attaching a plate-shaped partition plate 450 to the concrete block 10 of the first embodiment, the inside of the opening 60 can be partitioned, and the space can be filled with cocklebur to integrate it with the column portion 20.

[0060] Moreover, by placing such partition plates 450 on each block, it is possible to form a retaining wall 600 or another retaining wall 610. Furthermore, since the concrete blocks have the above-mentioned protrusions 22 or each blocking protrusion, they can maintain their strength even when stacked together. [Explanation of symbols]

[0061] 10 Concrete block of the first embodiment 20 Pillar section 22 Protrusion 30 Lower connection part 40 Upper connection part 60 Opening 70 Fillet 120 Concrete block of the second embodiment 121 Occlusion 30a Lower connection part 40a Upper connection part 20a Pillar 122 Obstruction protrusion 130 Third embodiment of concrete block 131 Second blockage 40b Upper connection part 140 Fourth embodiment of concrete block 141 Third blockage 40c Upper connection part 200 Fifth embodiment of concrete block 201 4th blockage 40d Upper connection part 20d pillar part 30d Lower connection part 222 4th protrusion 260 Concrete block of the sixth embodiment 261 6th blockage 40e Upper connection part 20e Pillar 30e Lower connection part 262 6th protrusion 300 Seventh embodiment of concrete block 301 7th blockage 40f Upper connection part 20f pillar part 30f Lower connection part 302 7th protrusion 380 Concrete block of the eighth embodiment 40g Upper connection part 20g pillar part 30g lower connection part 382 8th protrusion 450 Slab

Claims

1. To improve the porosity, four posts each having a lower portion; The four pillars are erected at a predetermined interval and four lower connecting portions connect the lower portions of the four pillars to each other, The four pillars further have upper parts, and four upper connecting parts connect the upper parts of the four pillars to each other, The four pillars, the four lower connecting parts, and the four upper connecting parts are connected to each other to form a hexahedral shape having six openings, and the six openings are connected to each other, The opening has a rectangular shape when viewed from the front, and further has arc-shaped fillets at corners of the rectangular shape, The four pillars further have a protrusion protruding downward from the lower connecting portion, The protrusion is integrally disposed directly below the column, The concrete block has a porosity of 83 percent.

2. 2. The concrete block according to claim 1, further comprising a closing portion that closes one of said six openings.

3. 2. The concrete block according to claim 1, further comprising closing portions that close two of said six openings that are adjacent to each other.

4. 2. The concrete block according to claim 1, further comprising closing portions that close three of said six openings that are adjacent to each other.

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