JP2004268275A - Method for manufacturing concrete product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form deep recessed parts on the surface of a concrete product even if a dry interlocking block molding machine is used and to ensure high productivity and product strength. <P>SOLUTION: The method for manufacturing the concrete product has a material supply step for filling a frame body 21 opened upwardly with a zero slump concrete material 22, a pressure step for pressurizing the concrete material 22 filled in the form body 21 from above by an upper mold 23 and a demolding step for instantaneously demolding the concrete product, which is obtained by curing the concrete material 22 pressurized by the upper mold 23, from the frame body 21 and the upper mold 23. Protrusions 24, 25 and 26 having an acute shape for forming recessed parts on the upper surface of the concrete product are provided to the upper mold 23 and linear tip surfaces 28, 31 and 35 with a width of 5 mm or below are formed to the protrusions 24, 25 and 26. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a concrete product manufacturing method for manufacturing a concrete product by molding a zero slump concrete material.
[0002]
[Prior art]
For example, when the concrete block 1 shown in FIG. 9 is to be manufactured, a frame is filled with a zero slump concrete material in a dry interlocking block molding machine, and the concrete material is pressed by a pressing die and immediately removed from the molding. At this time, a concave portion 2 can be formed on the surface of the concrete block 1 by providing a convex portion that enters the concrete material in the pressing die.
[0003]
[Problems to be solved by the invention]
By the way, in the concrete block 1, the concave portion 2 is formed by a gentle curved surface to reduce the resistance that the pressing die receives from the concrete material at the time of pressurization. When a machine is used, the depth of the concave portion 2 is limited to about 5 mm as shown in FIG. 9, and the degree of freedom of the surface design of the concrete block is limited.
[0004]
On the other hand, by using a concrete block forming machine for construction used for manufacturing decorative blocks and the like, it is possible to form a deep concave portion on the surface of the concrete block. The number of products that can be molded is greatly reduced, and the production efficiency (the number of products produced per unit time) is reduced to about 1/3 as compared with the case where a dry interlocking block molding machine is used as described above. In addition, a concrete block molding machine for building uses a multi-layer molding (a concrete block is divided into a plurality of layers and pressure-molded for each layer to form a concrete block, like a dry interlocking block molding machine or a dry concrete flat plate molding machine). Method), the aggregates that can be used on the decorative surface (surface) are limited and the degree of freedom of the surface design is still limited, and the entire block must be provided with relatively expensive aggregates. Since it must be used, it is difficult to reduce the cost of the product.
[0005]
Further, as shown in FIG. 10, a concrete material 6 is filled in a material supply box 5 in which the hanging core 4 is suspended by the flat bar 3, and the concrete material 6 is prevented from interfering with the flat bar 3 and the hanging core 4. By pressing from above, a concrete block 8 having a concave portion 7 with a depth on the surface as shown in FIG. 11 can be manufactured. However, in this method, since the press does not work on the portion below the flat bar 3 and the hanging core 4, there is a problem that the material is poorly clogged and the product is fragile.
[0006]
Furthermore, by increasing the overall height of the product or curing the concrete product for a long time without completely removing it, it is possible to form a deep recess on the surface of the concrete block. It is not preferable because it lacks practicality.
[0007]
The present invention has been made in view of the above circumstances, and even when a dry interlocking block molding machine or a dry concrete flat plate molding machine is used, a deep recess can be formed on the surface of a concrete product, and high productivity can be achieved. It is another object of the present invention to provide a method for manufacturing a concrete product that can reduce the cost of a product while ensuring product strength.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1 is a feeding step of filling a zero-slump concrete material into a frame body that is open at the top, and adding the concrete material filled into the frame body from above with a pressing die. Pressurizing step of pressing, and a concrete product manufacturing method having a demolding step of immediately demolding a concrete product obtained by curing the concrete material pressurized by the pressing die from the pressing die and the frame body, The pressing die is provided with a sharp convex portion for forming a concave portion on the upper surface of the concrete product, and the convex portion has a linear or dot-like tip surface having a width of 1 mm or more and 5 mm or less. It is characterized by having.
[0009]
According to a second aspect of the present invention, in the method for manufacturing a concrete product according to the first aspect, the frame has a frame-shaped side mold surrounding the concrete material, and the convex portion is entirely formed on an inner surface of the side mold. It is provided along the circumference, and the height of the side mold is smaller than the height of the concrete product.
[0010]
The invention according to claim 3 includes a plurality of feeding steps of filling a zero-slump concrete material into a frame body opened at the top and a pressing step of pressing the concrete material filled in the frame body from above with a pressing die. After repeatedly stacking the concrete materials one after another, a demolding step of immediately releasing the concrete product obtained by hardening the concrete material pressed by the pressing mold in the final pressing step from the pressing mold and the frame is performed. A method for manufacturing a concrete product, wherein a stamp used in a final pressing step is provided with a sharp-shaped convex portion for forming a concave portion on an upper surface of the concrete product, and the convex portion is 1 mm or more and 5 mm or less. A linear or dot-like tip surface having a width of?
[0011]
According to a fourth aspect of the present invention, in the method for manufacturing a concrete product according to the third aspect, a concrete material to be supplied in each of the supplying steps is different.
[0012]
According to a fifth aspect of the present invention, in the method for manufacturing a concrete product according to the third or fourth aspect, the frame used in the final pressing step has a frame-shaped side die surrounding the concrete material, and A part is provided along the entire surface on the inner surface of the side mold, and the height of the side mold is smaller than the height of the concrete product.
[0013]
According to a sixth aspect of the present invention, in the method for manufacturing a concrete product according to any one of the first to fifth aspects, the height of the projection is 20 mm or more.
[0014]
The invention according to claim 7 is the concrete product manufacturing method according to any one of claims 1 to 6, wherein the total height of the concrete product is 60 mm or more and 100 mm or less.
[0015]
According to the present invention, a sharp-shaped convex portion for forming a concave portion is provided on the upper surface of a concrete product, and a linear or dot-shaped tip surface having a width of 5 mm or less is formed on the convex portion by a pressing die. By pressing the zero-slump concrete material filled in the frame, even if a general dry-type interlocking block molding machine or dry-type concrete flat plate molding machine is used, the pressing mold can be converted to a concrete material with poor fluidity. It is possible to sufficiently penetrate, and it is possible to form a deep concave portion (for example, a concave portion having a depth of about 20 to 30 mm for a product having a total height of 60 to 100 mm) on the surface of a concrete product, and to achieve high productivity and product strength. Can be secured.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
[0017]
[Embodiment 1]
1 to 3 show a concrete block as a concrete product manufactured by the method according to the present embodiment. The concrete block 9 has various dimensions shown in each figure, and is laid on the ground when paving. The concrete block 9 has a rectangular parallelepiped base 10 in plan view, convex portions 11 formed on the upper surface of the base 10, and a front-rear direction (a vertical direction in FIG. 2) formed between the convex portions 11. ), Recesses 13, 13 formed on the upper surface of the base 10 along the outer edge so as to be parallel to the concave portion 12, and formed on the upper surface of the base 10 so as to be orthogonal to the recess 12 along the outer edge. Recessed portions 14, 14. When the concrete block 9 is laid, the soil, boulders and the like are stored in the recesses 12, 13, and 14.
[0018]
The convex portion 11 has a rectangular upper surface 15, inclined surfaces 16 and 17 surrounding the upper surface 15, and inclined surfaces 18 and 18. The inclined surfaces 16 and 17 are formed symmetrically with the upper surface 15 interposed therebetween. Reference numeral 18 is formed symmetrically with respect to the upper surface 15. Further, the inclined surface 16 is adjacent to the inclined surface 16 of the other convex portion 11, the inclined surface 17 extends in the front-rear direction along the outer edge of the base 10, and the inclined surface 18 extends in the left-right direction along the outer edge of the base 10. (The left-right direction in FIG. 2). The concave portion 12 is formed by being divided by the inclined surfaces 16, 16 of the two convex portions 11, the concave portion 13 is formed by being divided by the inclined surface 17, and the concave portion 14 is formed by the inclined surfaces of the two convex portions 11, 11. It is defined by surfaces 18, 18.
[0019]
In order to manufacture the concrete block 9, as shown in FIG. 4, first, in a dry-type interlocking block molding machine, a frame 21 having a frame-shaped (square tubular) side die 20 set on a seat die 19, The zero-slump super-hardened concrete material 22 is filled (step 1 (described as S.1 in FIG. 8A; the same applies to the present embodiment)).
[0020]
Next, the upper die 23 as a pressing die is lowered as shown in FIG. 5 to press the concrete material 22 from above (step 2). , Concave portions 13, 13, and convex portions 26, 26 for forming the concave portions 14, 14 are provided.
[0021]
More specifically, the convex portion 24 is sharply formed by the tapered inclined surfaces 27, 27, and as shown in FIG. 6A, the distal end portion is formed on the distal end surface 28 having a width of 5 mm. The front end surface 28 is linear and extends in the direction perpendicular to the paper surface of FIG. 3, and the inclined surface 27 forms the inclined surface 16, and the front end surface 28 forms the boundary (the lower edge portion) between the inclined surfaces 16, 16.
[0022]
The convex portion 25 is sharply formed by a vertical surface 29 and a tapered inclined surface 30, and as shown in FIG. 6B, the distal end portion is formed on a distal end surface 31 having a width of 5 mm. The tip surface 31 is linear and extends in the direction perpendicular to the paper surface of FIG. 3, and the inclined surface 30 forms the inclined surface 17, and the tip surface 31 forms the lower edge of the inclined surface 17. The vertical surface 29 is formed along the inner surface 32 of the side mold 20, and slides on the inner surface 32 of the upper mold 23 during descent so that the concrete material 22 does not leak from the inside of the frame 21.
[0023]
Similarly, the convex portion 26 is sharply formed by a vertical surface 33 and a tapered inclined surface 34, and the distal end portion is formed on a linear distal surface 35 having a width of 5 mm. The inclined surface 34 forms the inclined surface 18, and the tip surface 35 forms the lower edge of the inclined surface 18. The vertical surface 33 is formed along the inner surface 36 of the side mold 20, and slides on the inner surface 36 of the upper mold 23 during descent so that the concrete material 22 does not leak from the inside of the frame 21.
[0024]
When the pressing of the concrete material 22 by the upper mold 23 is completed, the concrete block 9 obtained by hardening the concrete material 22 is immediately released from the frame 21 and the upper mold 23 (step 3). Complete.
[0025]
According to the method of manufacturing a concrete block according to this embodiment, sharp convex portions 24, 25, 26 for forming the concave portions 12, 13, 14 are provided on the upper surface of the concrete block 9, and the convex portions are formed. By pressing the zero slump concrete material 22 filled in the frame body 21 by the upper mold 23 in which each tip of the parts 24, 25, 26 is formed in a linear shape having a width of 5 mm or less, even in a general case. Even when using a dry interlocking block molding machine or a dry concrete flat plate molding machine, the upper mold 23 can sufficiently enter the concrete material 22 having poor fluidity. In other words, the load acting on the upper mold 23 at the time of pressurization becomes extremely small by making each of the tips of the projections 24, 25, and 26 have the tip surfaces 28, 31, and 35 having a width of 5 mm or less. 24, 25, and 26 penetrate the concrete material 22 so as to penetrate the concrete material 22, and the tip (lower end) of the upper die 23 enters the concrete material 22 deeply.
[0026]
Therefore, using a general dry interlocking block molding machine as described above, while securing high productivity and low cost, forming a recess having a depth of 20 to 30 mm on a product having a total height of 60 to 100 mm. Can be.
[0027]
When the upper mold 23 is lowered, the concrete material 22 scraped off by the tip surfaces 28, 31, and 35 is guided by the inclined surfaces 27, 30, and 34 and flows between the convex portions 24, 25, and 26. Since the concrete material 22 is sufficiently pressed by the flat surfaces 37, 37 (see FIGS. 4 and 5) forming the inclined surfaces 27, 30, 34 and the upper surfaces 15, 15, the concrete material 22 is uniformly and sufficiently tightened as a whole. It is hardened, and the product strength of the concrete block 9 can be stabilized and increased.
[0028]
[Embodiment 2]
In the present embodiment, a two-layer concrete block having the same shape as that of the first embodiment is formed by a dry interlocking block forming machine or a dry concrete flat plate forming machine.
[0029]
That is, when the base layer portion of the concrete block (the portion indicated by the reference numeral 38 defined by the dashed line in FIG. 1) does not require design, first, an inexpensive material is supplied and pressed to form the base layer portion 38. (Steps 1 and 2 (referred to as S.1 and S.2 in FIG. 8B, respectively; hereinafter, the same applies to the present embodiment)), and then an expensive material exhibiting a design is applied to the base layer portion 38. Material is supplied to the upper part and pressurized to form a surface layer (a part including a decorative surface exposed when the concrete block is constructed and a part indicated by reference numeral 39 defined by a dashed line in FIG. 1) (step). 3. Step 4), the concrete block thus completed is immediately removed from the mold (step 5).
[0030]
By forming the concrete block into a plurality of layers in this manner, it is not necessary to use expensive materials that are required only for the surface layer 39 which is originally exposed from the soil to the base layer 38, thereby impairing the beauty of the concrete block. It is possible to achieve a significant cost reduction.
[0031]
Note that the present invention is not limited to the above-described embodiments.For example, in the above-described embodiment, a concrete block for pavement is manufactured as a concrete product. Alternatively, it may be a vegetation block or the like in which soil is put in the concave portion. Further, the depth of the concave portion can be easily changed by changing the angles (θ ₁ , θ ₂ in FIG. 6) and the height of the side die of the convex portion of the pressing die. Even if it is 5 mm or less, it may be not linear but a dot having a maximum diameter of 5 mm or less (however, the width of the convex portion is 1 mm or more so that the convex portion does not cause blade spillage). Further, in the above embodiment, since the concrete material 22 is moved toward the inside of the frame body 21 by the convex portions 25 and 26 so as not to leak, the height H of the side mold 20 (see FIG. 4) is the total height h of the product (see FIG. 4). 3), and thus, by suppressing the overall height of the side mold 20, the size of the side mold 20 can be reduced and the space in the molding machine can be made more efficient (see FIG. 7).
[0032]
【The invention's effect】
Since the present invention is configured as described above, even if a dry interlocking block molding machine or a dry concrete flat plate molding machine is used, a deep recess can be formed on the surface of a concrete product, and high productivity and product strength can be achieved. Thus, there is an effect that the cost of the product can be reduced while ensuring the quality.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a concrete block according to an embodiment of the present invention.
FIG. 2 is a plan view showing the concrete block of FIG.
FIG. 3 is a front view showing the concrete block of FIG. 1;
FIG. 4 shows a state in which a frame is filled with a concrete material in a molding machine to produce the concrete block of FIG. 1, (a) is a front view, and (b) is a side view.
5 shows a state in which the filled concrete material of FIG. 4 is pressurized, wherein (a) is a front view and (b) is a side view.
FIGS. 6A and 6B are enlarged views showing the tip of the convex portion of the upper die, FIG. 6A is an explanatory diagram showing an inner convex portion of the upper die, and FIG. 6B is an explanatory diagram showing an outer convex portion of the upper die. is there.
FIGS. 7A and 7B show a case where the height of the side mold is smaller than the height of the concrete product. FIG. 7A is an explanatory diagram of the first embodiment, and FIG. 7B is an explanatory diagram of the second embodiment.
8A and 8B show a method for manufacturing the concrete block of FIG. 1, wherein FIG. 8A is a flowchart for the first embodiment, and FIG. 8B is a flowchart for the second embodiment.
FIG. 9 shows a concrete block manufactured by a conventional manufacturing method, wherein (a) is a plan view and (b) is a front view.
FIG. 10 is an explanatory view showing another method for manufacturing a conventional concrete block.
11 shows a concrete block manufactured by the method of FIG. 10, (a) is a plan view thereof, and (b) is a front view thereof.
[Explanation of symbols]
9 concrete blocks (concrete products)
12, 13, 14 recess 20 side mold 21 frame 22 concrete material 23 upper mold (press mold)
24, 25, 26 Convex portions 28, 31, 35 Tip surfaces 32, 36 Inner surface

Claims (7)

A feeding step of filling a zero-slump concrete material into a frame having an open top, a pressing step of pressing the concrete material filled in the frame with a pressing die from above, and a concrete material pressed by the pressing die A concrete product obtained by curing the concrete product obtained by curing, and a demolding step of immediately demolding the molded product from the frame.
The pressing die is provided with a sharp convex portion for forming a concave portion on the upper surface of the concrete product, and the convex portion has a linear or dot-like tip surface having a width of 1 mm or more and 5 mm or less. A method for manufacturing a concrete product. The frame has a frame-shaped side mold surrounding the concrete material, and the projection is provided along the entire inner surface of the side mold over the entire circumference, and the height of the side mold is the height of the concrete product. The method for manufacturing a concrete product according to claim 1, wherein the height is smaller than the height. The material supply step of filling a concrete material of zero slump into the frame body opened at the top and the pressurizing step of pressing the concrete material filled in the frame body with a pressing die from above are repeated a plurality of times to sequentially laminate the concrete materials. And a concrete product obtained by hardening the concrete material pressurized by the pressing tool in the final pressing step, and a demolding step of immediately demolding the concrete product from the pressing die and the frame. ,
The pressing die used in the final pressing step is provided with a sharp convex portion for forming a concave portion on the upper surface of the concrete product, and the convex portion has a linear or dot shape having a width of 1 mm or more and 5 mm or less. A method for producing a concrete product, characterized in that a tip surface of the concrete product is formed. 4. The method for manufacturing a concrete product according to claim 3, wherein a concrete material supplied in each of the supplying steps is different. The frame used in the final pressing step has a frame-shaped side mold surrounding the concrete material, and the protrusion is provided along the entire periphery of the inner surface of the side mold, and the height of the side mold is provided. The method according to claim 3, wherein the height of the concrete product is smaller than the height of the concrete product. The method for manufacturing a concrete product according to any one of claims 1 to 5, wherein the height of the protrusion is 20 mm or more. The method for manufacturing a concrete product according to any one of claims 1 to 6, wherein the total height of the concrete product is 60 mm or more and 100 mm or less.

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