JP2002088945A - Piling-up brick and its piling-up method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply conduct piling-up works accurately without requiring skill for a worker, and to obtain the degree of freedom of piling-up corresponding to a desired structure when the brick structure is constructed. SOLUTION: In the rectangular parallelopiped-shaped brick 1, in which the ratio of length in the short direction to length in the longitudinal direction in top face and underside 1a and 1b is approximately a half, two approximately columnar or approximately cylindrical fitting projecting sections 2A and 2B are formed at the central places of squares obtained by dividing the top face 1a into two equal parts in the longitudinal direction respectively in the top face 1a, and a fitting recessed groove 3, into which both fitting projecting sections 2A and 2B can be fitted, is formed from one end of the underside 1b to a section near to the other end in the underside 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stacking brick for constructing structures such as flowerbed edging in a garden, an outdoor furnace, a pergola, stairs, and various walls.

[0002]

2. Description of the Related Art Normally, bricks are rectangular parallelepipeds, and all six sides are flat. Various bricks are piled up to form various structures such as the above-described flowerbed border. In the case of building, various stacking methods such as British stacking, French stacking, Dutch stacking, small stacking, long stacking, etc. are used, but in any stacking method, basically, up and down, left and right or further back and forth While sequentially placing the bricks, a mortar is interposed between adjacent bricks to form joints having a predetermined width.

[0003] However, in the above-described brick stacking operation, it is necessary for the worker to have a certain degree of skill in placing an appropriate amount of mortar between adjacent bricks while sequentially and accurately arranging the bricks vertically and horizontally and further back and forth. Is required in recent gardening booms.
It is difficult to construct a pergola or barbecue open-air furnace in the garden as Y, and in DIY work using a limited time on weekly holidays, it takes a long time to complete the target structure, There is a problem that the structure is often not beautifully completed.

In order to cope with the above-mentioned problem, in a horizontally long rectangular parallelepiped brick, a plurality of fitting projections are provided on an upper surface thereof, and fitting recesses corresponding to the fitting projections are provided on a lower surface thereof. There is also known a structure in which a stacking operation is facilitated by adopting a structure in which a fitting concave portion on a lower surface of an upper brick to be stacked is fitted to a fitting convex portion on an upper surface of a lower brick.

However, in the brick having the above structure,
Basically, the stacking position of the upper brick with respect to the lower brick is fixed because it is necessary to fit the corresponding fitting recesses on the lower brick upper surface into the plurality of fitting protrusions on the lower brick upper surface, respectively. There was a problem that would be done.

For this reason, for example, when building a border of a flower bed by stacking bricks in several stages, in a limited flower bed space in a garden, when the border is formed in a predetermined arc shape, the upper brick is replaced with the lower brick. However, there is an inconvenience that it is not possible to stack at a slight angle in the horizontal direction without stacking in parallel. In addition, if such an arc-shaped brick stacking is to be performed, it is necessary to previously arrange the fitting projections on the brick upper surface and the fitting recesses on the brick lower surface in such an arc-shaped stacking. Therefore, there is a problem in that the types of bricks increase, the number of types of bricks increases, and the trouble of inventory management increases.

[0007] An object of the present invention is to construct a structure such as a flowerbed rim or various walls without requiring a certain level of skill for an operator, and to sequentially and easily move vertically and horizontally or further back and forth. An object of the present invention is to provide a brick that can be stacked accurately and has a high degree of freedom in stacking corresponding to a target structure.

Another object of the present invention is to provide a stacking method for constructing various structures using the above-described stacking brick according to the present invention.

[0009]

The present invention according to claim 1 is used for constructing a structure by stacking a plurality of structures.
A rectangular parallelepiped stacking brick in which the ratio of the length in the transverse direction to the length in the longitudinal direction on the upper and lower surfaces is substantially ２, and two substantially cylindrical or substantially cylindrical surfaces are provided on one of the upper and lower surfaces. Fitting projections are provided at the center positions of squares obtained by bisecting the surface in the longitudinal direction, and the other surface has a fitting groove into which both fitting projections can be fitted from one end of the surface. The outer peripheral surface of one fitting convex portion, which is provided up to a portion near the other end and in which two fitting convex portions are fitted into the concave groove and the leading end wall of the concave groove is adjacent to the fitting concave portion. And a length that can be opposed to the front end portion of the fitting groove.

The present invention according to claim 2 is used for constructing a structure by stacking a plurality of structures, and the ratio of the length in the short direction to the length in the longitudinal direction on the upper and lower surfaces is approximately 1/2. A rectangular parallelepiped stacking brick, one of the upper and lower surfaces is a flat surface, and the other surface is provided at a central position of a square in which one of the upper and lower surfaces of another brick is bisected in the longitudinal direction. A fitting groove into which the two fitting protrusions can be fitted is provided from one end of the surface to a portion near the other end, and the fitting groove has two fitting protrusions fitted into the groove. In this state, the distal end wall of the concave groove has a length capable of facing the distal end side portion of the fitting concave groove on the outer peripheral surface of one fitting convex portion adjacent thereto.

According to a third aspect of the present invention, in the stacking brick according to the first or second aspect, the end wall of the fitting groove is formed in a semicircular shape.

The present invention according to claim 4 is used for constructing a structure by stacking a plurality of structures, and the ratio of the length in the short direction to the length in the longitudinal direction on the upper and lower surfaces is approximately 1/2. A rectangular parallelepiped stacking brick, in which one of the upper and lower surfaces is a flat surface, and two substantially cylindrical or substantially cylindrical fitting projections on the other surface bisect the surface in the longitudinal direction. Each is provided at the center of the square.

According to a fifth aspect of the present invention, there is provided the first to fifth aspects.
The size of the brick for stacking described in any one of 4 above is divided into two in the longitudinal direction.

According to a sixth aspect of the present invention, there is provided a method for stacking bricks according to the first aspect, wherein a plurality of bricks having upper surfaces as fitting protrusions are arranged in a line in a longitudinal direction thereof, and lower surfaces are fitted. The upper brick to be stacked as a concave groove is placed so as to straddle two lower adjacent bricks and to overlap approximately half of the length of the upper brick with the adjacent lower brick, respectively. In addition, adjacent fitting protrusions on the upper surfaces of both lower bricks are fitted into fitting grooves on the lower surface of the upper brick, respectively.

According to a seventh aspect of the present invention, there is provided the method for stacking bricks according to the first aspect, wherein a plurality of bricks having an upper surface as a fitting convex portion are arranged in an arc shape in a longitudinal direction thereof, and the lower surface is formed. The upper bricks to be stacked as the fitting concave grooves are respectively placed across the two lower adjacent bricks, and the adjacent fitting protrusions on the upper surfaces of both lower bricks are fitting recesses on the lower surface of the upper brick. A plurality of higher-order bricks are arranged in an arc shape on a plurality of lower-order bricks by being fitted into the grooves, respectively.

According to an eighth aspect of the present invention, there is provided a method of stacking bricks according to the first aspect, wherein a plurality of bricks having an upper surface as a fitting convex portion are arranged in a row in a lateral direction thereof, and a lower surface is formed. The upper brick to be stacked as a fitting concave groove is oriented in a direction orthogonal to the lower brick, and the brick is straddled over two adjacent lower bricks and substantially half from the center of the length of the upper brick. Are placed so as to overlap with the lower bricks adjacent to each other, and the adjacent fitting projections on the upper surfaces of both lower bricks are fitted into the fitting grooves on the lower surface of the upper brick, respectively. .

According to a ninth aspect of the present invention, there is provided the method for stacking bricks according to the first aspect, wherein a brick having a fitting groove on a lower surface is placed directly above a brick having a fitting projection on an upper surface. And two fitting protrusions on the upper surface of the lower brick are fitted into fitting grooves on the lower surface of the upper brick, respectively.

[0018]

Next, embodiments of the present invention will be described with reference to the drawings and examples. In the following,
“Up and down”, “front and back” and “left and right” are based on FIG.
Refers to the top and bottom of FIG. 2, and “front and back” refers to the left and right of FIG.
“Left” refers to the front side of the drawing sheet of FIG. 2 and “right” refers to the back side.

As shown in FIGS. 1 and 2, the first stacking brick 1 is a rectangular parallelepiped, and the ratio of the length in the short direction to the length in the longitudinal direction of the upper and lower surfaces 1a and 1b is 1%.
/ 2, specifically, the length L1 in the longitudinal direction is 210
mm, and the length L2 in the lateral direction is 105 mm. The thickness T of the brick 1 is 65 mm.

On the upper surface 1a of the brick 1, two substantially cylindrical fitting projections 2A and 2B are provided at the center positions of squares obtained by bisecting the surface in the length direction, respectively. 2B
Has a base end diameter d1 of about 51 mm, a tip end diameter d2 of about 46 mm, and a height H of the projections 2A and 2B of about 9 mm.
mm.

On the lower surface 1b of the brick 1, fitting protrusions 2A and 2B
Is provided from the left end to the right end portion of the surface 1b, and the opening width W1 of the fitting groove 3 is provided.
Is about 53 mm, bottom width W2 is about 48 mm, and depth D is about 1
1 mm. The fitting groove 3 is formed such that the semicircular distal end wall 3a of the groove 3 is adjacent to the fitting protrusion 2B in a state where the two fitting protrusions 2A and 2B are fitted into the groove. Outer peripheral surface 2b
The length can be opposed to the front end portion of the fitting concave groove 3 in FIG. Specifically, the length L3 from the base end 3b of the fitting concave groove 3 to the distal end wall 3a is about 188 mm, and an interval of about 4 mm between the fitting groove 2B and the outer peripheral surface 2b of the right fitting convex part 2B. It is open.

In some cases, the brick 1 has a size obtained by multiplying each of the above dimensions by about 1.1 times.

As shown in FIGS. 3 and 4, the second brick 4 is an upper surface 1 of the first brick 1.
a in which there is no fitting projection 2A, 2B, that is, the upper surface 1a is a flat surface, and the other portions are exactly the same as those of the first stacking brick 1. The description is omitted by assigning the same reference numerals as those of the bricks 1 for stacking.

As shown in FIGS. 5 and 6, the third brick 5 is a lower surface 1 of the first brick 1.
b, in which the fitting groove 3 is not provided, that is, the lower surface 1b is a flat surface, and the other portions are exactly the same as the first stacking brick 1, so that
The description is omitted by attaching the same reference numerals as those of the first stacking brick 1.

As shown in FIG. 7, the fourth stacking brick 6 has a form corresponding to the right half of the first stacking brick 1 divided into two in the longitudinal direction.
Specifically, one fitting protrusion 2B is provided at the center position of the upper surface 1a of the brick 6, and a fitting groove 23 extending from the left end to a portion closer to the right end is provided on the lower surface 1b.

As shown in FIG. 8, the fifth stacking brick 7 has a form corresponding to the right half portion of the second stacking brick 4 divided into two in the longitudinal direction.
Specifically, the upper surface 1a of the brick 7 is a flat surface, and the lower surface 1b is provided with a fitting groove 33 extending from the left end to a portion closer to the right end.

As shown in FIG. 9, the sixth stacking brick 8 is one obtained by dividing the third stacking brick 5 into two in the longitudinal direction. One fitting projection 2B is provided at the center position of 1a, and the lower surface 1b is flat.

Next, a stacking method using the bricks described above will be described.

FIG. 10 shows a first stacking method using the first bricks 1, in which a plurality of bricks 1A are arranged in a line in the longitudinal direction thereof, and the upper bricks 1 to be stacked are stacked.
B is placed so as to straddle the lower adjacent two bricks 1A so as to straddle the lower adjacent two bricks 1A so that half of the length of the upper brick 1B overlaps with the adjacent lower brick 1A. One fitting projection 2A on the upper surface 1a
2B is a fitting groove 3 in the lower surface 1b of the brick 1B.
It fits into each.

In the above-described stacking, the third brick 5 may be used in place of the first brick 1A located at the lowermost stage, and the lower surface 1b of the third brick 5 has a flat surface. Therefore, the first brick 1 having the fitting concave groove 3 on the lower surface 1b can be more stably arranged on the ground.

FIG. 11 shows a second stacking method using the first bricks 1 in which a plurality of bricks 1A are arranged in an arc shape in the longitudinal direction of the bricks 1A, and a higher-order brick 1B to be stacked is formed. Each of the lower adjacent bricks 1A is placed across the two adjacent bricks 1A, and the adjacent fitting protrusions 2A and 2B on the upper surface 1a of both lower bricks 1A are connected to the lower surface 1 of the upper brick 1B.
The upper bricks 1B are arranged in an arc shape on the lower bricks 1A by fitting them into the fitting grooves 3 in b.

That is, in this stacking method, for example, when bricks are stacked in several stages to construct a border of a flower bed,
When the edge is formed in a predetermined arc shape, the upper brick 1B
Are piled up at a slight angle in the horizontal direction without being piled up in parallel with the lower brick 1A.

The upper brick 1B is replaced with the lower brick 1A.
When the piles are stacked at a slight angle in the horizontal direction, the fitting projections 2A and 2B on the upper surface 1a of the lower brick 1A are attached to the semicircular tip wall 3a in the fitting groove 3 of the upper brick 1B. Since the upper brick 1B can be rotated by a predetermined angle in the contact state, the work of stacking the bricks can be performed easily and accurately.

Also in this stacking method, the third brick 5 is replaced with the first brick 1A located at the lowermost stage.
Is used, the stability of the lowest brick on the ground can be increased.

FIG. 12 shows a third stacking method using the first bricks 1, in which a plurality of bricks 1A are arranged in a line in the lateral direction of the bricks, and the upper bricks 1 to be stacked are stacked.
B is a direction orthogonal to the lower brick 1A, the brick 1B straddles two lower adjacent bricks 1A, and each half of the upper brick 1B from the center of the length of the upper brick 1B is adjacent to the lower brick 1A. The bricks 1A are placed so as to overlap each other, and one fitting protrusion 2A on the upper surface 1a of both lower bricks 1A is fitted into the fitting groove 3 on the lower surface 1b of the upper brick 1B.

In this stacking method, the third brick 5 is replaced with the third brick 5A instead of the first brick 1A located at the bottom.
Is used, the stability of the lower brick on the ground can be increased.

FIG. 13 shows a fourth stacking method using the first brick 1 described above.
Another first brick 1B is placed, and two fitting projections 2A and 2B on the upper surface 1a of the lower brick 1A are fitted into the fitting grooves 3 on the lower surface 1b of the upper brick 1B. .

In this stacking method, the third brick 5 is replaced by the third brick 5A instead of the first brick 1A located at the lowermost stage.
Can of course be used.

FIG. 14 shows the wall 9 constructed by the first stacking method. Specifically, first, the first bricks 1 are arranged in a row in the longitudinal direction as the first step on the ground, and the fourth stacking bricks 6 are arranged at both ends thereof, and then the first bricks 1 are set as the second step. Pile 1 of bricks, then 3
As the first step, the same bricking as in the first step is performed, and as the fourth step, the same bricking as in the second step is performed. The wall 9 is constructed by disposing the fifth stacking bricks 7 and arranging the second stacking bricks 4 between the bricks 7 in the longitudinal direction.

Further, instead of the first brick 1 in the first stage, a third stacking brick 5 having a flat lower surface 1b is used, and a sixth stacking brick 6 is used instead of the fourth stacking brick 6.
May be used, and in this case, the first-stage bricks on the ground can be more stably arranged.

In any of the brickwork described above, a structure can be constructed without intervening mortar between adjacent bricks. However, by appropriately interposing mortar as necessary, the structure can be further improved. Of course, it can be built firmly.

FIG. 15 shows the above-mentioned first to sixth bricks 1.
This is a barbecue outdoor furnace 11 basically constructed by the first stacking method by appropriately using 4 to 7. In addition,
In the outdoor furnace 11, mortar is interposed between adjacent bricks.

[0043]

According to the present invention, any of the bricks for stacking according to any one of the first to fifth aspects of the present invention basically has a structure in which a substantially cylindrical or substantially cylindrical fitting protrusion and a fitting groove are fitted. Because it is possible to build, in building a target structure, it is possible to sequentially and easily pile up predetermined bricks, and because it is not necessary to necessarily intervene mortar between adjacent bricks, The work of stacking bricks can be greatly simplified.

Therefore, in the gardening boom in recent years, it is possible to easily construct a pergola or an outdoor furnace for barbecue in the garden as a DIY, and even if the DIY work is performed using a limited time on a weekly holiday, the purpose can be improved. It is possible to construct a beautiful structure in a short period of time.

In addition, in the case of the brick for stacking according to any one of claims 1 to 5 according to the present invention, for example, when building a border of a flowerbed by stacking bricks in several stages, in a limited flowerbed space in a garden, In the case where the border is formed in a predetermined arc shape, the upper bricks can be stacked at a slight angle by rotating the bricks in the horizontal direction without stacking them in parallel with the lower bricks. Then, in this case, unlike the conventional bricks for stacking, it is not necessary to separately manufacture different types of bricks in order to perform arc-shaped stacking, so that the number of types of bricks does not increase, There is no inconvenience such as an increase in labor for inventory management.

In the brick for stacking according to the first aspect, two substantially columnar or substantially cylindrical fitting projections are provided on one of the upper and lower surfaces, and the center of the square is obtained by bisecting the surface in the longitudinal direction. The other surface is provided with a fitting groove in which both fitting protrusions can be fitted from one end of the surface to a portion near the other end, and the fitting groove has two fittings in the groove. In the state where the convex portion is fitted, the distal end wall of the concave groove has a length capable of opposing the distal end side portion of the fitting concave groove on the outer peripheral surface of one of the adjacent convex fitting portions. By stacking only one type, the structure can be easily and beautifully constructed.

According to a second aspect of the present invention, one of the upper and lower surfaces is a flat surface, and the other surface is located at a central position of a square in which one of the upper and lower surfaces of another brick is bisected in the longitudinal direction. A fitting groove into which the two fitting protrusions provided respectively can be fitted is provided from one end of the surface to a portion near the other end, and the fitting groove has two fitting protrusions in the groove. In the fitted state, the leading end wall of the concave groove has a length that can face the distal end side portion of the fitting concave groove on the outer peripheral surface of one fitting convex portion adjacent thereto. A structure constructed by stacking the bricks on the top of the brick, with the lower surface of the brick being a concave groove so as to be fitted to the fitting protrusions, in the stacking where the fitting protrusions are on the upper surface of the brick one lower than the upper stage. Since the upper surface of the object can be made the plane of the upper surface of the brick, the structure There is an advantage that the aesthetic appearance of the can be improved.

According to the third aspect of the present invention, the bricks for stacking according to the first or second aspect of the present invention have a semi-circular shape at the tip end wall of the fitting groove, so that they can be stacked on lower bricks. When stacking the upper bricks at an angle in the horizontal direction, the substantially cylindrical or substantially cylindrical fitting convex portion is positioned in a state of being positioned along the semicircular tip wall of the fitting concave groove in the upper brick. Since the bricks can be rotated, there is an advantage that the arc bricks can be stacked more smoothly.

According to a fourth aspect of the present invention, one of the upper and lower surfaces has a flat surface, and the other surface has two substantially cylindrical or substantially cylindrical fitting projections on the surface in the longitudinal direction. Because they are provided at the center of each equally divided square,
In building a structure by stacking bricks, if the bottom brick is made by arranging a plurality of bricks with the lower surface flat with respect to the ground and the upper surface with fitting protrusions, the subsequent brick stacking work is more stable There is an advantage that it can be done in a convenient way.

Since the brick according to the fifth aspect has a size obtained by dividing the brick according to the first to fourth aspects into two in the longitudinal direction, for example, the bricks according to the first to fourth aspects are arranged in a line in the longitudinal direction thereof. The upper bricks to be stacked were placed so as to straddle two lower adjacent bricks and to overlap half of each of the upper bricks from the center of the length of the upper brick on both lower adjacent bricks. In this case, there is an advantage that the bricks can be appropriately stacked in a half space of the bricks formed on both sides thereof.

In any of the above-described stacking methods, bricks are stacked basically by fitting two fitting projections into fitting recesses. , Bricks can be stacked easily and accurately in order from the lower stage to the upper stage.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first brick according to the present invention.

FIG. 2 is a left side view of the first brick.

FIG. 3 is a perspective view of a second brick according to the present invention.

FIG. 4 is a left side view of the second brick.

FIG. 5 is a perspective view of a third brick according to the present invention.

FIG. 6 is a left side view of the third brick.

FIG. 7 is a perspective view of a fourth brick according to the present invention.

FIG. 8 is a perspective view of a fifth brick according to the present invention.

FIG. 9 is a perspective view of a sixth brick according to the present invention.

FIG. 10 is a perspective view showing a brick-laying state by the first stacking method according to the present invention.

FIG. 11 is a plan view showing a brick-stacking state according to a second stacking method according to the present invention, in which the fitting protrusions 2A and 2B of the upper brick 1B are omitted.

FIG. 12 is a perspective view showing a brick-stacking state according to a third stacking method according to the present invention.

FIG. 13 is a perspective view showing a brick-stacking state according to a fourth stacking method according to the present invention.

FIG. 14 is a perspective view of a wall constructed by the first stacking method according to the present invention.

FIG. 15 is a perspective view of an outdoor furnace constructed by the first stacking method.

[Explanation of symbols]

 1: First brick for stacking 1a: Upper surface of brick 1b: Lower surface of brick 2A, 2B: Fitting convex portion 3,23,33: Fitting groove 4: Second brick for brick 5: Third stacking Bricks 6: fourth stacking bricks 7: fifth stacking bricks 8: sixth stacking bricks

Claims (9)

[Claims] 1. A rectangular parallelepiped brick, which is used to build a structure by stacking a plurality of pieces, and wherein a ratio of a length in a short direction to a length in a longitudinal direction on upper and lower surfaces is approximately 1/2. Among the upper and lower surfaces, two substantially cylindrical or substantially cylindrical fitting projections are provided on one surface at the center of a square obtained by bisecting the surface in the longitudinal direction, and both surfaces are provided on the other surface. A fitting groove into which the fitting protrusion can be fitted is provided from one end of the surface to a portion near the other end, and the fitting groove is formed by fitting the two fitting protrusions into the recess. A brick for stacking, wherein a leading end wall of the groove has a length capable of opposing a leading end side portion of the fitting concave groove on an outer peripheral surface of one fitting convex portion adjacent thereto. 2. A rectangular parallelepiped brick, which is used to construct a structure by stacking a plurality of pieces, and wherein a ratio of a length in a short direction to a length in a longitudinal direction on upper and lower surfaces is approximately 1/2. There, one of the upper and lower surfaces is made flat,
The other surface is provided at a central position of a square in which one of the upper and lower surfaces of another brick is bisected in the longitudinal direction.
A fitting groove in which two fitting protrusions can be fitted is provided from one end of the surface to a portion near the other end, and the fitting groove is provided in a state where the two fitting protrusions are fitted in the groove. A brick for stacking, in which a leading end wall of a concave groove has a length capable of opposing a distal end portion of a fitting concave groove on an outer peripheral surface of one fitting convex portion adjacent thereto. 3. The brick for stacking according to claim 1, wherein the wall of the tip of the fitting groove is formed in a semicircular shape. 4. A rectangular parallelepiped brick for building a structure by stacking a plurality of bricks, wherein a ratio of a length in a transverse direction to a length in a longitudinal direction on upper and lower surfaces is approximately 1/2. There, one of the upper and lower surfaces is made flat,
A brick for stacking, in which two substantially columnar or substantially cylindrical fitting projections are provided on the other surface at the center positions of squares obtained by bisecting the surface in the longitudinal direction. 5. The brick for stacking according to claim 1, wherein the brick has a size divided into two in the longitudinal direction. 6. The method of stacking bricks according to claim 1, wherein a plurality of bricks having upper surfaces as fitting projections are arranged in a line in a longitudinal direction thereof, and lower surfaces as fitting grooves. The upper brick is straddled over two lower adjacent bricks, and approximately half of the length of the upper brick is placed so as to overlap with the adjacent lower brick, respectively, and the upper bricks are placed on the upper surfaces of both lower bricks. Adjacent fitting protrusions are fitted into fitting recesses on the lower surface of the upper brick, respectively.
How to stack bricks. 7. The method for stacking bricks according to claim 1, wherein a plurality of bricks each having an upper surface having a fitting convex portion are arranged in an arc shape in a longitudinal direction thereof, and the lower surface having a fitting groove. By placing the upper brick to be straddled over two adjacent lower bricks, and fitting the adjacent fitting protrusions on the upper surfaces of both lower bricks into the fitting grooves on the lower surface of the upper brick, respectively. A method of stacking bricks, comprising arranging a plurality of upper bricks in an arc on a plurality of lower bricks. 8. The method for stacking bricks according to claim 1, wherein a plurality of bricks each having an upper surface having a fitting convex portion are arranged in a row in a lateral direction thereof, and the lower surface having a fitting concave groove. With the upper brick to be oriented orthogonal to the lower brick, the lower brick straddles the two lower adjacent bricks and is approximately half each half the length of the upper brick from the center of the length of the upper brick. A method of stacking bricks, wherein the bricks are placed so as to overlap with each other, and adjacent fitting projections on the upper surfaces of both lower bricks are fitted into fitting grooves on the lower surface of the upper brick, respectively. 9. The method for stacking bricks according to claim 1, wherein a brick whose lower surface is fitted with a concave groove is placed immediately above the brick whose upper surface is fitted with a convex portion, and a lower brick upper surface is placed. Characterized in that the two fitting projections in (1) and (2) are respectively fitted into fitting grooves on the lower surface of an upper brick.