JP2003336369A - Concrete block for stair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it easier to level treads when constructing a stair outdoors, improve the efficiency of stair construction, and setting smaller for both the tread and riser at the same time instead of only one of them as required, thereby adjusting the size and gradient of the tread and riser in multistage on the construction site. <P>SOLUTION: An outer shape almost has a shape of rectangular parallelopiped, its top surface 21 constitutes a tread of a stair, the front surface 22 of the rectangular parallelopiped is formed to constitute a riser of the stair, a notch groove 23a vertical to the bottom surface 23 is provided with almost uniform depth astride the whole width relative to the bottom surface 23 near the front edge of the bottom surface 23 facing the tread 21, a notch groove 24a vertical relative to the rear surface 24 is provided at an almost uniform depth astride all the width near the upper edge of the rear surface 24 facing the riser 22. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete block for stairs suitable mainly for constructing outdoor stairs.

[0002]

2. Description of the Related Art As a concrete block for stairs used for constructing outdoor stairs, as shown in FIG.
A concrete block 10 having an L-shaped cross section is known. The stair concrete block 10 is formed by integrally molding a horizontal tread plate 11 and a vertical riser plate 12, and as shown in the drawing, a mortar or a normal mortar on a base slope 13 made of mortar. A staircase is formed by arranging the pedestal 14 which is built of hollow concrete blocks.

However, since the conventional concrete block 10 for stairs has a L-shaped cross section, it is lighter than natural stone, but on the other hand, the front edge (step nose) of the tread, that is, the side of the riser falls too much. There is a problem in that it is difficult to level the tread horizontally because it rises too much, and it is difficult to obtain stability when placing the above blocks, which makes it difficult to construct the stairs. In addition, the footboard 11 and the riser board 12 described above are individually molded to form the base slope 1
There is also known a method in which the riser plate 12 of the vertical member is fixed to the mortar 3 with mortar and the step plate 11 of the horizontal member is applied after hardening, but this has a problem that it takes a longer time for the installation.

[0004]

DISCLOSURE OF THE INVENTION The present invention facilitates leveling of treads when constructing stairs outdoors, improves the efficiency of stair construction, and, if necessary, only one of the treads and kicks. Rather than setting both to be small at the same time, various types of dimensional adjustments can be made at the construction site regarding treads and risers.

[0005]

The concrete block for stairs according to the present invention has an outer shape of a substantially rectangular parallelepiped, the upper surface of the rectangular parallelepiped constitutes the stepping surface of the stairs, and the front surface of the rectangular parallelepiped raises the stairs. Is molded to make
A notch groove perpendicular to the bottom surface is provided near the front edge of the bottom surface facing the tread surface at a substantially uniform depth over the entire width, and a notch perpendicular to the back surface is provided near the upper edge of the back surface facing the kicking. It is characterized in that the groove is provided over the entire width with a substantially uniform depth.

Although the concrete block for stairs of the present invention is molded into a substantially rectangular parallelepiped outer shape, the rectangular parallelepiped referred to here is not a rectangular parallelepiped in a strict geometrical sense, and is a step nose provided in many stairs. It means that you can stick out or kick in. That is, the front edge of the footboard may be slightly projected forward of the kick-up, or the kick-up may be slightly inclined with respect to the vertical plane to position the nose above the front edge of the bottom surface to form a kick. it can. However, the tread surface and the bottom surface remain parallel.

The above concrete block for stairs has a substantially rectangular parallelepiped shape, and its bottom surface is a plane parallel to the tread surface of the upper surface. Therefore, when constructing stairs outdoors, the position where the concrete block for stairs is placed is If it ’s flat,
Even if the ground is gravel, it is stable just by placing it. Therefore, the leveling of the tread surface is easy, and it is easy to obtain stability when the block is placed, and it is possible to use it as stairs by simply placing it, and the stairs can be efficiently constructed accordingly.

When the above concrete block for stairs is used for the construction of stairs as it is, the riser size is reduced by stacking the riser lower part of one block and the upper part of the back face of the other block as in the conventional case. The size of the tread surface can be set, and the tread surface dimension can be set small by overlapping the rear part of the tread surface of one block and the front part of the bottom surface of the other block.

On the other hand, by cutting the lower end portion of the kick-up facing the notch groove on the bottom surface with a cutter or hitting with a hammer or the like, it is possible to remove the lower end portion of the kick-up to reveal the groove wall of the notch groove on the bottom surface. Also, by cutting the rear end of the tread facing the rear cut groove with a cutter or hitting it with a hammer, the rear end of the tread is removed to reveal the groove wall of the rear cut groove. Therefore, by cutting one or both of the lower end portion of the riser and the rear end portion of the tread surface and using them for the stairs, the dimensions of the tread surface and the riser can be changed in multiple stages. When using a cutter, it is possible to cut at the middle of the depth direction instead of the bottom of the cut groove.

The position and the depth of the above-mentioned cut groove are arbitrary as long as they can be cut out by using a cutter, a hammer or the like at the construction site of the stairs, and in the normal case, The position where the cut groove on the back surface is provided is preferably 30 to 60 mm from the upper end, and the depth thereof is 40 to 70 mm.
mm is preferred. Further, the position where the cut groove on the bottom surface is provided is preferably 25 to 70 mm from the front end, and the depth thereof is 20 to 70 mm.
mm is preferred.

In the concrete block for stairs,
A cavity in the width direction can be provided in a penetrating manner from one of the left and right side surfaces to the other. In this case, the weight of each stair concrete block can be reduced, and the handling becomes easier. Further, the above concrete block for stairs can be provided with a ridge that extends the tread along the upper edge of the front surface that constitutes the riser, that is, a protrusion of a nose and a riser in which the riser is inclined. In this case, the tread length increases more than the low tread length, and the stairs can be easily moved up and down. In addition, on both the tread and the rise of the above,
Unevenness and lateral streaks can be provided for decoration or non-slip.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A stair concrete block 20 shown in FIG. 2 is made of hardened concrete in a substantially rectangular parallelepiped shape, and an upper surface 21 is a tread surface and a front surface 22.
Form a riser, and a ridge (protruding nose) 22a is provided along the upper edge of the front face (rise) 22a, and its upper surface (the lower right portion of the chain line A) 21a forms an extension of the tread surface 21. I am configuring. Further, it has a bottom surface 23 facing the top surface (step surface) 21, a back surface 24 facing the front surface (kicking up) 22, and a right surface 26 facing the left surface 25.
And a cavity 27 in the width direction is provided so as to penetrate from one of the left and right side surfaces 25, 26 toward the other.

In the vicinity of the front edge of the bottom surface 23, more specifically, at a position 25 to 70 mm away from the front edge, a notch groove 23a perpendicular to the bottom surface 23 is substantially uniform over the entire width of the stair concrete block 20. Depth, 20 in detail
It is provided with a depth of ~ 70 mm. Further, in the vicinity of the upper edge of the back surface 24, more specifically, at a position separated by 30 to 60 mm from the upper edge, a notch groove 24a perpendicular to the back surface 24 has a substantially uniform depth over the entire width, specifically 40 to 40 mm. It is provided with a depth of 70 mm.

Therefore, when the lower part (lower part of the chain line B) 22b of the front surface (kick-up) 22 is partially cut by a cutter or the lower part 22b is hit with a hammer or the like,
The riser lower portion 22b below the chain line B is cut out. Further, when the rear part (the rear side portion of the chain line C) 21b of the upper surface (the tread surface) 21 is partially cut by a cutter or the rear part 21b is hit with a hammer or the like, the rear part of the tread surface after the chain line C is cut. 21b is cut out.

3 (a) to 3 (d) show examples of use of the concrete block 20 for stairs. Figure 3 (a)
Is an example of a staircase configuration in which the block 20 is used as it is without the cut-up lower portion 22b and the tread rear portion 21b being cut out. That is, the lower edge of the riser 22 of the one block 20 shown in the upper left and the trailing edge of the tread surface 21 of the other block 20 shown in the lower right are arranged to abut against each other. In this case, concrete block for stairs 2
The 0 tread 21 is used as it is. Further, the rise 22 of the block 20 is used as it is to form the step of the stairs. The lower part of the one riser 22 and the upper part of the other back face 24 can be overlapped to reduce the step, or the front part of the one bottom face 23 and the rear part of the other tread surface 21 can be overlapped to reduce the tread surface. .

FIG. 3 (b) shows an example of the construction of a staircase in which the block 20 is used by cutting out the riser lower part 22b. That is, the rear end of the tread surface 21 of the other block 20 shown in the lower right is fitted into the stepped portion (22b) formed by notching the riser lower portion 22b of the one block 20 shown in the upper left. In this case, depending on the size of the step portion (22b) formed by the notch in the lower kicking portion 22b, the tread surface 21
Both the riser 22 and the lift 22 are shortened. That is, the tread surface 21 is shortened according to the position of the groove 23a on the bottom surface 23,
The lift 22 is shortened according to the depth of the groove 23a.

FIG. 3 (c) shows an example of a staircase structure in which the block 20 is used by cutting out the rear portion 21b of the tread surface. That is, the lower end portion of the riser 22 of the one block 20 shown at the upper left is fitted into the step portion (21b) formed by notching the tread surface rear portion 21b of the other block 20 shown at the lower right. In this case, both the tread surface 21 and the riser 22 are shortened according to the size of the step portion (21b) formed by the notch in the riser lower portion 22b. That is, the back surface 24
The tread 21 is shortened according to the depth of the groove 24a of the
The kick-up 22 is shortened according to the position of 4a.

FIG. 3D shows an example of a staircase structure in which the block 20 is used by cutting out both the raising lower portion 22b and the tread rear portion 21b. That is, the step portion (22b) formed by notching the riser lower portion 22b of the one block 20 shown in the upper left and the other block 2 shown in the lower right.
The stepped part (21
b) mesh with. It should be noted that FIG. 3D shows an example in which the lower corners of one riser 22 are engaged with each other so as to be fitted into the rear recesses of the other tread surface 21.
The rear side corner of the other tread surface 21 can be engaged with the lower recess of the second step 2. Then, the dimensions of the kick-up and the tread can be variously changed depending on how to engage with each other.

FIG. 4 is a block diagram similar to FIG. 3 (c).
This is an example of the structure of a staircase in which the rear portion 21b of the tread 0 is cut out and used.
2 is an example in which the mortar M is applied to the step portion (21b) when the lower end portion of the step portion (21b) is formed by cutting out the tread surface rear portion 21b of the other block 20 shown in the lower right. . In this case, the step difference is set in the middle of FIG. 3A and FIG. 3C according to the coating thickness of the mortar M.

5A to 5C show another embodiment of the concrete block 20 for stairs. Figure 5
The stair concrete block 20A of (a) is formed by omitting the nose protrusion 22a of the stair concrete block 20 and forming the riser 22 on a vertical plane.
Moreover, the concrete block 20B for stairs of FIG.5 (b)
The upper half portion 22c of the riser 22 is formed into a concave curved surface to eliminate the hook-shaped step portion between the nose protrusion 22a and the riser 22 in the stair concrete block 20 of FIG. Further, in the concrete block for stairs 20C of FIG. 5 (c), the riser 22 is an inclined surface connecting the lower end of the protruding nose 22a and the front end of the bottom surface 23,
A so-called riser 22d is formed to eliminate the hook-shaped step portion under the nose protrusion 22a as in FIG. 5 (b).

[0021]

As described above, in the concrete block for stairs according to the present invention, since the tread surface is easily leveled, the efficiency in constructing stairs outdoors is improved,
Moreover, if necessary, not only one of the tread and the kick-up but also both of them can be set to be small at the same time, so that various kinds of dimensional adjustments can be made for the tread and the kick-up. Particularly, the invention according to claim 2 is effective for weight reduction.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conventional example.

FIG. 2 is a perspective view of an embodiment.

FIG. 3 is a side view showing a usage pattern.

FIG. 4 is a side view showing another usage pattern.

FIG. 5 is a side view showing another embodiment.

[Explanation of symbols]

20: concrete block for stairs 21: upper surface (tread), 21a: extension of tread, 21
b: tread rear part 22: front surface (kick-up) 22a: ridge (protruding nose), 22b: kick-up lower part,
Numeral 22c: Raising upper half 22d: Raising 23: Bottom surface, 23a: Cutting groove 24: Back surface, 24a: Cutting groove 25: Left side surface 26: Right side surface 27: Cavity

Claims (2)

[Claims] 1. An outer shape having a substantially rectangular parallelepiped shape, an upper surface of the rectangular parallelepiped forming a step surface of a staircase, a front surface of the rectangular parallelepiped formed so as to form a rise of the staircase, and a bottom surface facing the tread surface. A notch groove perpendicular to the bottom surface is provided near the front edge of the tongue with a substantially uniform depth across the entire width, and a notch groove perpendicular to the back surface extends across the entire width near the upper edge of the back surface facing the kicking. A concrete block for stairs, which is characterized by having a substantially uniform depth. 2. The concrete block for stairs according to claim 1, wherein a cavity in the width direction is provided so as to penetrate from one of the left and right side surfaces to the other.