JP2000355011A - Manufacture of perforated concrete plate for both planting and protecting ground surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate removal of a large number of rod-like mold members for molding smaller diametral through holes and exert no bad influence upon the growth of vegetables and also further prevent a concrete from being deteriorated. SOLUTION: In this device, a molding form, on the inner surface of a form main body 10 of which for forming the external shape of a concrete plate, a large number of a rod-like mold members 12 for molding the perforated portion of a concrete plate to be molded is projected, is employed so as to fill a concrete in the form main body 10 in order to steam-cure the concrete. In this case, a foaming resin material is used at least on the surface of each red like mold member 12 so as to apply a heavy oil on the surface of the foaming resin material and fill the concrete in order to steam-cure the resultant concrete, resulting in shrinking the foaming resin materials.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a perforated concrete slab having a large number of small-diameter through-holes that are opened on the front and back.

[0002]

2. Description of the Related Art Conventionally, as a method of protecting a ground surface such as a dike from running water, there is a method of laying a concrete slab on the ground surface. In this method, since the ground surface is covered with concrete, the natural scenery is significantly impaired. In recent years, a method has been developed which satisfies both ground surface protection and greening.

[0003] A concrete slab having a large number of small-diameter through-holes opened on the front and back sides is one of the most effective means for protecting the river surface and revegetation at the same time as protecting the slopes. It is effective in retaining earth and sand carried by running water, growing plants, and regaining greenery.

[0004] In the production of a perforated concrete slab for protecting the ground surface and greening, conventionally, a tapered rod-shaped member having a draft on the inner surface of a formwork is projected, and an oil component is added thereto. There is a method in which concrete is cast by applying a release agent made of the above, and then solidified and then released.

[0005]

However, the concrete plate developed by the present inventor for greening and protecting the ground surface has a large number of small-diameter holes having a diameter of 1 to 3 cm. Even if the member has a draft angle, it is difficult to remove the mold after solidification due to the adhesive force of the concrete.

[0006] When a large amount of release agent is used in order to facilitate demolding, traces and coloring of oil bubbles appear on the concrete surface, which remain in small through holes and adversely affect the growth of plants. However, there is a problem that it is not effective for demolding.

The present invention has been made in view of such a conventional problem,
A perforated concrete plate for greening and ground surface protection that makes it easy to remove a large number of rod-shaped members that form small-diameter through holes, does not adversely affect the growth of plants, and can also prevent concrete deterioration. The purpose is to provide a manufacturing method.

[0008]

SUMMARY OF THE INVENTION The features of the present invention for solving the conventional problems as described above and achieving the intended purpose are as follows.
On the inner surface of the mold body for molding the outer shape of the concrete slab, a molding mold is used in which a number of bar-shaped mold members for forming a perforated portion of the concrete slab to be molded are protruded, and concrete is poured into the mold body. In the method for producing a perforated concrete plate for greening and ground surface protection after filling and steam curing, at least the surface of the bar-shaped mold member of the formwork is made of a foamed resin material, and the foamed resin material in the rod-shaped mold member is formed. After the application of heavy oil to the surface of the mold, the form body is filled with concrete and steam cured to shrink the foamed resin material.

The mold comprises a mold body having at least an inner surface made of a foamed resin material and a rod-shaped mold member having at least a surface made of a foamed resin material, wherein the inner surface of the mold body and the rod-shaped mold are formed. The surface of the member is coated with heavy oil and then filled with concrete. The mold is formed by integrally molding a bottom mold plate and a rod-shaped mold member with a foamed resin material at the bottom of a mold body made of a mold material. After applying heavy oil to the surface of the bottom mold plate and the rod-shaped mold member of the mold, concrete is filled, and the bottom of the mold body made of the mold material is provided with a perforated plate. Therefore, it is preferable to use a mold member having an irregular shape formed on the surface of the bottom mold plate of the mold member.

[0010]

Embodiments of the present invention will now be described with reference to the drawings.

1 and 2 show an example of a perforated concrete slab for greening and ground surface protection formed by the method of the present invention, wherein 1 is a concrete slab body having a square plane. A large number of tapered through holes 2, 2,... The size of this concrete slab is, for example, 2 squares per side.
The tapered through holes having a diameter of 0 to 100 cm and a thickness of 5 to 25 cm and having an opening diameter of 1 to 3 cm on the surface are formed in a substantially uniform arrangement at an opening ratio of 5 to 20% with respect to the surface area of the concrete plate.

FIGS. 3 and 4 show an example of a mold for forming the above-mentioned perforated concrete slab. In the figures, reference numeral 10 denotes a mold body. The form body 10 is entirely formed of a foamed resin material and has a bottom plate 11 formed with a through hole 2.
Are molded integrally from the same material.

When forming a perforated concrete slab using such a form, heavy oil a is applied to the entire inner surface of the form body 10 and the surface of all rod-shaped mold members 12 before casting concrete.
Is applied or sprayed. Thereafter, as shown in FIG. 4, concrete 13 is cast in a state where the rod-shaped member 12 is embedded, and a necessary compaction treatment such as vibration is performed.

Next, the concrete in the form body 10 is steam cured in a state where the concrete is cast. The steam curing is performed at a temperature of 60 ° C. or higher. More specifically, after placing for 2 to 4 hours after placing concrete, preferably 15 to 25 ° C./h
r at a rate of 60 ° C. or higher, preferably 65 to 7
Steam cure at a temperature of 5 ° C for 2-4 hours.

By curing at 60 ° C. or more, the foamed resin material coated with heavy oil shrinks,
The fluidized foamed resin material flows down and is naturally released during curing.

Incidentally, examples of the foamed resin material include foamed polystyrene, foamed polyurethane, foamed polypropylene and the like. The heavy oil applied to the foamed resin material is specified in “JIS K2205 (heavy oil)”.
Species or two are preferred.

The amount of heavy oil applied is preferably at least 1.0 in terms of weight ratio with respect to the foamed resin material. Generally, when the weight ratio is 1.0 or more, the shrinkage of the foamed resin material is 90% or more. It can be. In addition, even if it is 1.0 or less, it is possible to shrink the foamed resin material, and when the shrinkage ratio is small, the remaining mold body 1 after steam curing
A demolding operation for removing the 0 and the rod-shaped mold member 12 is required.

FIGS. 5 and 6 show a second embodiment of the present invention. In this embodiment, a mold body 20 molded with a normal mold material such as a mold is used, and a foamed resin material is used. A foamed resin mold member 23 obtained by integrally molding a bottom mold plate 21 and a bar-shaped mold member 22 is inserted on the bottom surface of the mold body 20 to form a mold. Heavy oil a is applied to the surface of the member 22, concrete 13 is cast, and steam curing is performed as described above.

FIGS. 7 and 8 show a third embodiment of the present invention. In this embodiment, trapezoidal cross-section irregularities are integrally formed on the surface of a concrete slab of the mold body of the second embodiment. The trapezoidal irregularities 24 are integrally formed on the surface of the bottom mold plate 21 of the foamed resin mold member 23, and the bar-shaped mold member 22 is integrally formed on the surface. .
This is inserted into the mold body 20 and, as in the second embodiment,
Apply heavy oil, cast concrete, and steam cure.
In addition, 25 in FIG. 8 is a reinforcing bar.

FIG. 9 shows a fourth embodiment of the present invention. In this embodiment, a raised bottom plate made of a perforated plate is spaced apart from a bottom plate 31 of a mold body 30 made of a mold material. 3
2 and a molten resin pool 33 under the raised bottom plate 32.
And The foamed resin mold member 23 of the second or third embodiment is installed on the raised bottom plate 32 of the mold body 30, and the application of heavy oil, the casting of concrete, and the steam curing are performed in the same manner as described above.

The resin material whose volume has been reduced by the steam curing and which has been dissolved and fluidized is mixed with the raised bottom plate 32 made of a perforated plate.
Flows down from the opening 34, and the formed concrete slab is separated from the foamed resin material and left on the raised bottom plate 32.

In the fourth embodiment, the foamed resin mold member is removed from the concrete slab by steam curing and flows down and remains in the molten resin pool, so that the resin material after separation is easily collected.

In each of the above-described embodiments, the entire rod-shaped mold member is molded from a foamed resin material. However, the rod-shaped mold member may be molded from the surface thereof with a foamed resin material by a certain thickness. Although the bar-shaped mold member remains in the through hole of the concrete slab in a state where the foamed resin portion is contracted, it can be easily removed.

[0024]

As described above, in the method for producing a perforated concrete plate for greening and ground surface protection according to the present invention,
On the inner surface of the mold body for molding the outer shape of the concrete slab, a molding mold is used in which a number of bar-shaped mold members for forming a perforated portion of the concrete slab to be molded are protruded, and concrete is poured into the mold body. In the method for producing a perforated concrete plate for greening and ground surface protection after filling and steam curing, at least the surface of the bar-shaped mold member of the formwork is made of a foamed resin material, and the foamed resin material in the rod-shaped mold member is formed. After applying heavy oil to the surface of the mold, the form body is filled with concrete, and the foamed resin material is shrunk by steam curing, so that the rod-shaped form and the concrete are formed by steam curing which is usually performed. And the removal of many rod-shaped members is facilitated.

Further, the resin material that has shrunk and melted remains in a state in which a part of the resin material adheres to the inner surface of the through hole of the concrete slab, and this becomes a state in which the inner surface of the through hole is coated. Suppresses elution and alleviates the adverse effects of alkali (such as calcium carbonate) on plants that grow in the through-holes,
Carbonation (neutralization) of the concrete is prevented, whereby deterioration of the concrete is suppressed, and deterioration of the quality of the concrete and generation of rust on the reinforcing steel in the concrete can be suppressed.

The mold comprises a mold body having at least an inner surface made of a foamed resin material and a rod-shaped mold member having at least a surface made of a foamed resin material, wherein the inner surface of the mold body and the rod-shaped mold are formed. After applying heavy oil to the surface of the member,
By filling with concrete, the entire formwork can be removed by steam curing, and the demolding operation becomes unnecessary.

[0027] The above-mentioned mold frame contains a mold member formed by integrally molding a bottom mold plate and a rod-shaped mold member with a foamed resin material at the bottom of a mold frame body made of a mold material. By filling the surface of the bottom mold plate and the bar-shaped mold member with heavy oil and then filling with concrete, the strength of the mold frame is increased, and handling such as transportation is facilitated.

Further, a perforated plate is provided at the bottom of a mold body made of a mold material, and a mold member is accommodated on the perforated plate, whereby a molten resin pool can be provided at the bottom of the mold body. In addition, the resin material that melts and flows down by steam curing can be easily collected.

[Brief description of the drawings]

FIG. 1 is a plan view of an example of a concrete slab manufactured according to the present invention.

FIG. 2 is a longitudinal sectional view of the same.

FIG. 3 is a plan view of a mold used in the first embodiment of the method of the present invention.

FIG. 4 is a longitudinal sectional view of the same.

FIG. 5 is a vertical cross-sectional view of the same concrete placing state.

FIG. 6 is a longitudinal sectional view of a concrete casting state according to a second embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a third embodiment of the present invention in a state where concrete is filled.

FIG. 8 is a longitudinal sectional view of a perforated concrete slab manufactured in the embodiment.

FIG. 9 is a longitudinal sectional view of a concrete filling state according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete plate main body 2 Through-hole 10 Form body 11 Bottom plate part 12 Bar-shaped member 13 Concrete 20 Form body 21 Bottom mold plate 22 Bar-shaped member 23 Foamed resin mold member 24 Irregularity 25 Reinforcing bar 30 Form plate body bottom plate 31 Bottom plate 32 Raised Bottom plate 33 Melted resin pool 34 Opening

Claims (5)

[Claims] 1. A mold having a plurality of rod-shaped mold members projecting from the inner surface of a mold body for molding an outer shape of a concrete slab to form a perforated portion of the concrete slab to be molded. In the method of manufacturing a perforated concrete plate for greening and ground surface protection in which the body is filled with concrete and then steam-cured, wherein at least the surface of the rod-shaped mold member of the formwork is made of a foamed resin material, After applying heavy oil to the surface of the foamed resin material in the member, concrete is filled in the form body, and the foamed resin material is shrunk by steam curing, thereby opening a hole for greening and ground surface protection. Open concrete plate manufacturing method. 2. The mold according to claim 1, wherein the mold comprises a mold body having at least an inner surface made of a foamed resin material and a rod-shaped mold member having at least a surface made of a foamed resin material. The method for producing a perforated concrete plate for greening and ground surface protection according to claim 1, wherein concrete is filled after heavy oil is applied to the surface of the member. 3. The mold according to claim 1, wherein a mold member in which a bottom mold plate and a rod-shaped mold member are integrally formed with a foamed resin material is accommodated in a bottom portion of a mold body made of a mold material. The method for producing a perforated concrete plate for greening and ground surface protection according to claim 1, wherein concrete is filled after heavy oil is applied to the surfaces of the bottom mold plate and the rod-shaped mold member. 4. The method for producing a perforated concrete plate for greening and ground surface protection according to claim 3, wherein the bottom of the mold body made of the mold material is provided with a perforated plate. 5. The method for producing a perforated concrete plate for greening and ground surface protection according to claim 3, wherein a mold member having an uneven shape formed on the surface of a bottom mold plate of the mold member is used.