JPH05318425A - Production of porous concrete - Google Patents

Abstract

PURPOSE:To produce porous concrete within a short time by filling a form with a mixture of coarse aggregate and cement milk and rotating the form to separate the coarse aggregate and unnecessary cement milk by centrifugal force. CONSTITUTION:A first cylindrical form 10 having a rectangular cross section is provided in the outer shell 2 of a centrifugal molding machine in a freely detachable manner and filling space 10a is formed in the form 10 so as to be surrounded by a plate-shape frame 10b. A lid 3 is detached and the filling space 10a is filled with a premix of coarse aggregate 35 and cement milk 37 and the lid 3 is closed to rotate the outer shell 2. Whereupon, centrifugal force acts on the cement milk 37 to allow the cement milk 37 to flow toward the frame 10b provided to the inner peripheral surface of the form 10 to form frame concrete with predetermined strength filled with the cement milk 37. The unnecessary cement milk 37 in the central part of the form 10 is flown and the only the cement milk 37 necessary for bonding the coarse aggregate 35 is left to form porous concrete having voids 36 formed thereto. Therefore, porous concrete can be produced within a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing porous concrete suitable for producing porous concrete.

[0002]

2. Description of the Related Art Conventionally, on the bottom surface where concrete is poured,
Porous concrete is manufactured by forming concrete on the lower surface so that unnecessary cement milk can easily flow out by gravity, such as by laying a wire mesh open to the extent that coarse aggregate does not flow out, and then pouring the concrete.

[0003]

However, in this method, the unnecessary cement milk is discharged only by gravity, so that the unnecessary cement milk is not completely discharged and the predetermined cavity is not formed. Not only that, it was necessary to wait for a long time for unnecessary cement milk to flow out, and it was not possible to mass-produce porous concrete in a short time.

In view of the above circumstances, it is an object of the present invention to provide a method for producing porous concrete, which is capable of efficiently producing porous concrete.

[0005]

SUMMARY OF THE INVENTION The present invention provides a mold (10,
11 and 15), and the mold is filled with coarse aggregate (35) and cement milk (37) that have been kneaded in advance, and when these coarse aggregate and cement milk are filled in the mold,
The mold is configured to rotate.

The numbers in parentheses are for convenience of showing the corresponding elements in the drawings, and the present description is not limited to the description in the drawings. The same applies to the column of "action" below.

[0007]

With the above-described structure, the present invention rotates the coarse aggregate (35) and the cement milk (37) which have been kneaded in advance to rotate the coarse aggregate and the unnecessary cement milk in the cement milk by centrifugal force. Acts to be separated by.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cutaway perspective view showing an embodiment of a centrifugal molding machine applied to the porous concrete manufacturing method according to the present invention,
2 is a sectional view showing an example in which a mold is attached to the centrifugal molding machine shown in FIG. 1, and FIG. 3 is a sectional view showing an example in which another mold is attached to the centrifugal molding machine shown in FIG. FIG. 4 is a perspective view showing an example of another centrifugal molding machine applied to the method for producing porous concrete according to the present invention, and FIG. 5 shows an example of still another form of the form shown in FIGS. 2 and 3. FIG.

As shown in FIG. 1, a centrifugal molding machine 1 according to the present invention has a cylindrical outer shell 2 made of an iron plate or the like.
Below (in the figure), the first disc-shaped rollers 5, 5
Are provided so as to sandwich the outer shell 2. That is, outer shell 2
As shown in FIG. 1, the outer surface 2b of the outer shell 2 has a plurality of first surfaces.
The rollers 5 and 5 are provided so as to be placed on the contact surfaces 5a and 5a. A plurality of the first rollers 5 are fixedly supported by a cylindrical shaft 6, and the shaft 6 is supported at both ends of the shaft 6 by supporting bases 7 made of bearings and the like, and the longitudinal direction of the outer shell 2 (arrow). It is provided parallel to the A and B directions). Further, the shaft 6 is rotatably provided in the directions of arrows R and S around the rotation axis CT1, and the contact surface 5a of the first roller 5 is in contact with the contact surface 8a of the second roller 8. .. The second roller 8 is provided in parallel with the longitudinal direction of the outer shell 2 (directions of arrows A and B) while being supported by a support or the like (not shown).
Is rotatably provided in the directions of arrows T and U about the rotation axis CT2. That is, when the second roller 8 is rotationally driven in the direction of arrow T, the first roller 5 rotates in the direction of arrow S together with the shaft 6, and the outer shell 2 rotates the virtual rotation axis CT.
It rotates in the direction of arrow P about 3. Further, disk-shaped lids 3 and 3 are detachably provided on the ends 2d and 2d of the outer shell 2.

In the outer shell 2, as shown in FIG.
The first mold 10 having a rectangular cross section and made of an iron plate or the like is the outer shell 2
Is detachably provided on the inner surface 2a of the first mold 10
The filling space 10a is formed so as to be surrounded by the plate-shaped frame 10b. That is, by removing the lids 3 and 3 from the outer shell 2, the filling space 10a of the first mold 10 communicates with the outside.

Since the centrifugal molding machine 1 has the above-mentioned structure, when the porous concrete manufacturing method according to the present invention is applied, first, the lids 3 and 3 shown in FIG. 1 are removed from the end portions 2d and 2d of the outer shell 2. Remove the filling space 10 of the first formwork 10.
In a, the coarse aggregate 35 and the cement milk 37, which have been kneaded in advance, are filled, and when the filling is completed, the lids 3 are attached to the ends 2d and 2d of the outer shell 2, and the inside of the first mold 10 is filled. It is closed so that the filled coarse aggregate 35 and cement milk 37 do not flow out. Then, the second roller 8 shown in FIG. 1 is rotationally driven to rotate the outer shell 2 at a predetermined number of rotations, and the first mold 10 is rotated. Then, the centrifugal force acts on the cement milk 37 filled previously, and the frame 1 around the inside of the first mold 10 is
Frame concrete 31 that has a predetermined strength and flows to the 0b side (the inner surface 2a side of the outer shell 2) and is filled with cement milk 37
(A portion between the chain line and the frame 10b in the figure) is formed.
On the other hand, in the center of the first formwork 10, the unnecessary cement milk 37 is blown away to leave only the cement milk 37 necessary for joining the coarse aggregate 35, and the porous concrete 30 having the predetermined voids 36 is formed. It is formed. Then, the first formwork 10 is rotated at a predetermined rotation speed until the porous concrete 30 and the frame concrete 31 are hardened, and when the first formwork 10 is hardened, the rotation of the first formwork 10 is stopped, and the first formwork 10 is Remove from the outer shell 2 and demold. Then, a square columnar porous concrete pile 32 is manufactured in which the porous concrete 30 is formed at the center and the frame concrete 31 having a predetermined strength is formed around the porous concrete 30.

In this way, the coarse aggregate 35 and the cement milk 37, which have been kneaded in advance, are filled in the first mold 10 and rotated, whereby the coarse aggregate 35 and the cement milk 3 are mixed.
The centrifugal force acts on the cement milk 37 in 7. Therefore, the unnecessary cement milk 37 can be separated by the centrifugal force by appropriately adjusting the rotation speed of the first mold, so that it is shorter than waiting for the outflow of the unnecessary cement milk due to gravity as in the conventional case. Therefore, unnecessary cement milk can be discharged. Therefore, the porous concrete 30 can be efficiently produced and mass production is possible. Further, since the first aggregate 10 is filled with the coarse aggregate 35 and the cement milk 37 which have been mixed in advance, the porous concrete 3 formed in the central portion of the first enclosure 10
The coarse aggregates 35 of 0 are securely bonded.

In the above-described embodiment, the porous concrete pile 32 is manufactured in which the porous concrete 30 is formed in the central portion and the frame concrete 31 having a predetermined strength is formed in the periphery, but all of the porous concrete piles 32 are manufactured. It is also possible to produce a porous concrete pile 33 consisting of

That is, in the outer shell 2, as shown in FIG.
The second mold 11 having a rectangular cross section and made of an iron plate or the like is the outer shell 2
Is detachably provided on the inner surface 2a of the second mold 11
The filling space 11a is formed so as to be surrounded by a porous plate-shaped frame 11b. That is, by removing the lids 3 and 3 from the outer shell 2, the filling space 11a of the second mold 11 communicates with the outside. In addition, a large number of dehydration holes 12 are provided in the frame 11b.
Are formed so as to communicate the filling space 11a with the inside of the outer shell 2.

Therefore, in the same manner as described above, the filling space 11a of the second formwork 11 is filled with the coarse aggregate 35 and the cement milk 37, which have been kneaded in advance, and the lids 3 and 3 are closed, as shown in FIG. 2 Rotate the roller 8 to rotate the outer shell 2,
The second formwork 11 is rotated at a predetermined rotation speed. Then, the cement milk 37 filled previously is centrifugally driven by the centrifugal force, and the dehydration hole 1
2 to the outside of the second formwork 11 (on the inner surface 2a side of the outer shell 2), and the unnecessary cement milk 3
7 is skipped to leave only cement milk 37 necessary for joining the coarse aggregate 35, and the porous concrete 30 in which the predetermined voids 36 are formed is formed. Therefore, after the porous concrete 30 has hardened, the rotation of the second form is stopped, and the porous concrete 30 is taken out of the outer shell 2 and released from the mold. Then, since the porous concrete 30 is formed in the entire second form 12, the porous concrete pile 33 that is entirely made of the porous concrete 30 is manufactured. The unnecessary cement milk 37 discharged from the second formwork 11
Since it is stored in the outer shell 2, it does not scatter to the outside, and unnecessary cement milk 37 discharged from the second mold 11 may be discharged to the outside after centrifugal molding.

Further, in the above-described embodiment, the first shell 1 provided inside the outer shell 2 is rotated by rotating the outer shell 2.
0, the second formwork 11 was rotated, but the first formwork 10, the second
It suffices if the mold 11 can be rotated. For example, like another centrifugal molding machine 1 ′ shown in FIG. 4, a cylindrical mold having lids 3 ′ and 3 ′ formed on both ends of the first mold 10 is used. Support rollers 9 and 9 are provided respectively, and these support rollers 9 and 9 are first
You may make it rotate with the roller 5. The second
When the unnecessary cement milk 37 is discharged to the outside of the form like the form 11, it is possible to prevent the unnecessary cement milk 37 from scattering outside by making the form double.

The porous concrete piles 32, 33 produced as described above are cut into desired lengths of the required porous concrete blocks and used as porous concrete blocks such as vegetation. In order to make it easy to cut these porous concrete piles 32 and 33 into a desired length of a required block, a form is formed so that notches are formed in the manufactured porous concrete piles 32 and 33. You may form like the 3rd formwork 15 shown in FIG.

That is, the third frame 15 has a rectangular frame 15b made of an iron plate or the like and having a rectangular cross section. Inside the third frame 15, the filling space 15a is surrounded by the frame 15b. Has been formed. A convex cutout molding portion 16 having a triangular cross section is formed on the inner surface 15c of the third mold 15 over the entire circumference of the inner surface 15c. The cutout molding portion 16 is formed in the longitudinal direction of the third mold 15 ( A plurality of blocks are provided at intervals of a slice length L which is a desired length of a required block in the left-right direction in the drawing. Therefore, in the porous concrete pile manufactured by the third formwork 15, a plurality of groove-shaped notches having a triangular cross section formed around the porous concrete pile are formed at intervals of the slice length L. Therefore, the porous concrete block can be easily formed by cutting the porous concrete pile in a cut shape for each of these notches. Instead of the convex cut-out molding portion 16 having a triangular cross section, a plate-like partition plate or the like is filled in the filling space 15.
It goes without saying that the porous concrete block can be formed without cutting the porous concrete pile if it is provided in the third formwork 15 in the form of dividing a.

It goes without saying that, if necessary, steam curing may be carried out to promote hardening, or reinforcing bars may be added to reinforce. Further, in the above-mentioned embodiment, the molds 11, 12 and 15 having a rectangular cross section are used as the molding shape,
Molded shapes are polygons such as triangles, rectangles, hexagons and circles,
It goes without saying that it may be oval or the like.

[0020]

As described above, the present invention has molds such as the first mold 10, the second mold 11, the third mold 15, and the like.
The mold is filled with coarse aggregates such as coarse aggregate 35 and cement milk such as cement milk 37 which are kneaded in advance, and when these coarse aggregates and cement milk are filled in the form,
Since the mold was configured to rotate, by rotating the coarse aggregate and cement milk that have been mixed in advance,
Since these coarse aggregates and unnecessary cement milk in the cement milk are separated by centrifugal force, it is necessary to discharge the unnecessary cement milk in a shorter time than waiting for the unnecessary cement milk to flow out due to gravity as in the past. You can Therefore, the porous concrete can be efficiently produced, and the porous concrete can be mass-produced.

[Brief description of drawings]

FIG. 1 is a cutaway perspective view showing an embodiment of a centrifugal molding machine applied to a porous concrete manufacturing method according to the present invention.

FIG. 2 is a cross-sectional view showing an example in which a mold is attached to the centrifugal molding machine shown in FIG.

3 is a cross-sectional view showing an example in which another mold is attached to the centrifugal molding machine shown in FIG.

FIG. 4 is a perspective view showing an example of another centrifugal molding machine applied to the method for producing porous concrete according to the present invention.

5 is a cutaway perspective view showing an example of still another form of the form shown in FIGS. 2 and 3. FIG.

[Explanation of symbols]

 10 ... Formwork (first formwork) 11 ... Formwork (second formwork) 15 ... Formwork (third formwork) 35 ... Coarse aggregate (coarse aggregate) 37 ... Milk cement ( Milk cement)

Claims (1)

[Claims] 1. Having a formwork, the formwork is filled with coarse aggregate and cement milk that are kneaded in advance, and when the coarse aggregate and cement milk are filled in the formwork, the formwork is A method for producing porous concrete, which is configured to rotate.