JP2000355012A - Manufacture of perforated concrete plate for both planting and protecting ground surface and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the easy pulling-out of a large number of rod-like mold members for forming smaller diametral through holes even after the setting of a concrete. SOLUTION: In this device, a molding form, on the inner surface of the main body 10 of which for forming the external shape of a concrete plate a large number of rod-like mold members 13 for molding the perforated portion of the concrete plate to be molded are projected, is employed so as to lay and fill a concrete in the molding form under the condition that one or several times of the rotating action about the axis center of the rod-like mold member 13 and/or of the shifting action toward its axis center are given to each rod-like mold member 13 during the period between the starting and finish of the setting of the cement of the concrete. As a result, the adhesion between the rod-like mold member 13 and the concrete is reduced before the setting of the concrete.

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, the ground surface is covered with concrete,
In recent years, methods for satisfying both ground surface protection and greening have been developed to significantly impair the natural scenery.

[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 becomes difficult to remove the mold after solidification due to the adhesive force of the concrete. Also,
If a large amount of release agent is used in order to facilitate demolding, traces of oil bubbles and coloring appear on the concrete surface, and this remains in small-diameter through-holes, adversely affecting the growth of plants, and However, there were problems such as inefficiency against demolding.

The present invention has been made in view of such a conventional problem,
An object of the present invention is to provide a method of manufacturing a perforated concrete plate for greening and ground surface protection which can be easily performed even after solidification of concrete, whereby a large number of rod-shaped mold members forming small-diameter through holes are formed, and a device therefor. Things.

[0007]

SUMMARY OF THE INVENTION In order to solve the conventional problems as described above and to achieve the intended object, a feature of the method of the present invention is that an inner surface of a form body for molding an outer shape of a concrete slab is provided. Using a molding form in which a number of bar-shaped mold members for forming a perforated portion of a concrete plate to be molded are projected, concrete is poured into the molding form, and then the concrete is set from the start of cement setting of the concrete. Until the end, 1
Alternatively, the rod-shaped member is rotated several times about its axis and / or moved in the axial direction to reduce the adhesion between the rod-shaped member and concrete before the concrete is solidified. It is in.

A feature of the apparatus of the present invention is that a formwork body for molding the outer shape of the concrete slab, and a rod-like body which is provided on the inner surface of the formwork body to form a perforated portion of the concrete slab to be formed. There is provided a mold member, and a rod-shaped member operating mechanism that operates the rod-shaped members outside the mold body.

[0009] The rod-shaped member operating mechanism is such that the outer ends of the form body of each rod-shaped member are linked to a rotation transmission mechanism that is linked to each other, and the rotation transmission mechanisms are operated by a drive source such as a motor. Accordingly, it is preferable that the rod-shaped member is rotated.

[0010]

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

FIGS. 1 and 2 show an example of a perforated concrete plate for greening and ground surface protection formed by the method and apparatus according to the present invention, wherein 1 is a concrete plate body having a square plane. In addition, a large number of tapered through holes 2, 2,... The size of the concrete slab is, for example, a square having a side of 20 to 100 cm, a thickness of 5 to 25 cm, and a tapered through hole having an opening diameter of 1 to 3 cm on the surface. The openings are arranged in a substantially uniform arrangement at a rate of about 20%.

FIGS. 3 and 4 show an example of an apparatus for forming the above-described perforated concrete slab. In the figures, reference numeral 10 denotes a mold body. This formwork body forms the outer shape of the body of the perforated concrete slab, and is configured by standing up side plates 12, 12,... On four peripheral edges of a square bottom plate 11.

On the upper surface of the bottom plate 11, a number of rod-shaped members 1 are provided.
Are projected at predetermined intervals. This rod-shaped member forms the through hole 2 of the perforated concrete slab, and a predetermined number of rod-shaped members protrude from the upper surface of the bottom plate 11 in a predetermined arrangement. Each rod-shaped member 13 is rotatably mounted on the bottom plate 11 and is simultaneously rotated via a rotation transmission mechanism 14 installed below the bottom plate 11.

As shown in FIG. 4, the rotation transmitting mechanism 14 has gears 15 at the lower ends of the rod-shaped members 13, 13,...
Are fixed, and the gears 15 adjacent to each other are engaged with each other in each row of the bar-shaped members, and the interlocking gears 16 are engaged with the gears located at the ends of each row. By operating one of them with a driving source including a motor 17, all the rod-shaped members 13,
13 are rotated simultaneously.

In addition to the above, the rotation transmitting mechanism 14 engages the racks 18 with the gears 15, 15 as shown in FIG.
.. May be operated simultaneously.

Further, as shown in FIG.
The chain wheels 18, 18 are fixed to the ends of 3, 13,..., And a single chain 19 wound around these is operated by a driving source composed of a motor 17, whereby each of the rod-shaped members 13, 13 is moved. .. May be operated simultaneously. In this case, a pulley may be used instead of the chain wheel, and an endless belt may be used instead of the chain.

Further, as shown in FIGS. 7 (a) and 7 (b), cams 20, 20 are fixed to the respective bar-shaped members 13, 13,. The rod-shaped members 13, 13,... For each row may be operated by reciprocating the operating rod 22.

Further, the driving source may be a human power using a handle in addition to the motor. In the above-described example, the bar-shaped mold member is protruded from the bottom plate surface. However, when the form body is formed with the side of the concrete slab facing upward, the front or back surface of the concrete slab is formed. The present invention can be similarly applied to a structure in which a bar-shaped member is protruded in the horizontal direction on the surface of a vertically oriented template to be formed.

In manufacturing the above-described perforated concrete slab using the apparatus having the above-described configuration, concrete is poured into the formwork body 10, and after the concrete starts to set, but before the completion of the setting. Then, the stick-shaped member 13 is rotated once or several times to prevent the sticking to the concrete.

In the above-described apparatus, an example in which the rod-shaped member is rotated is shown. However, in the method of the present invention, the rod-shaped member 13 is rotated.
May be moved in the axial direction to reduce the adhesion of concrete.

Further, in the above-mentioned example, the case where the form is used and concrete is poured into the inside is shown. However, the concrete is directly poured on the ground surface and the perforated concrete plate is set on the ground surface. If you do, for example,
The form body of the apparatus shown in FIG. 7 may be used upside down, and the concrete may be cast inside by placing the bottom plate on the upper surface side of the concrete plate.

[0022]

As described above, in the method and apparatus for manufacturing a perforated concrete plate for greening and ground surface protection according to the present invention, the inner surface of the form body for forming the outer shape of the concrete plate is formed. Using a molding form in which a number of rod-shaped mold members for forming the perforated portion of the concrete slab are projected, concrete is poured into the molding form, and then from the start of cement setting of the concrete to the end of the setting. During this time, the rod-shaped member is rotated one or several times around its axis in a rotational direction and / or in an axial direction, thereby adhering the rod-shaped member and concrete to concrete. By reducing the temperature before solidification, the rod-shaped members have little adhesion to concrete when the concrete is solidified. Made to the easy and draft also without requiring large, becomes unnecessary release agent.

[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 an example of the device according to the present invention.

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

FIG. 5 is a bottom view of the rotation transmission mechanism of the same.

FIG. 6 is a bottom view of another example of the above rotation transmitting mechanism.

FIG. 7 is a bottom view of still another example of the rotation transmission mechanism of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete slab main body 2 Through-hole 10 Form body 11 Bottom plate 12 Side plate 13 Bar-shaped member 14 Rotation transmission mechanism 15 Gear 16 Interlocking gear 17 Motor 18 Rack 19 Chain 20 Cam 21 Cam system joint projection 22 Reciprocating rod

Claims (3)

[Claims] 1. A molding die having a large number of bar-shaped mold members projecting from the inner surface of a mold main body for molding an outer shape of a concrete slab for molding a perforated portion of a concrete slab to be molded. After the concrete is poured and filled in the frame, the rod-shaped member is rotated one or several times around its axis and / or between the start of cement setting of the concrete and the end of the setting. A method for manufacturing a perforated concrete plate for greening and ground surface protection, characterized by reducing the adhesion between the rod-shaped member and the concrete before the concrete is solidified by performing a movement in the center direction. 2. A mold body for molding an outer shape of a concrete slab, a rod-shaped mold member projecting from the inner surface of the mold body and forming a perforated portion of the concrete slab to be molded.
An apparatus for manufacturing a perforated concrete plate for greening and ground surface protection, comprising: a bar-shaped member operating mechanism for operating each of the bar-shaped members outside the mold body. 3. The rod-shaped member operating mechanism is such that the outer ends of the form body of each rod-shaped member are linked to a rotation transmission mechanism that is interlocked with each other, and the rotation transmission mechanisms are operated by a drive source such as a motor. The perforated concrete plate manufacturing apparatus for greening and ground surface protection according to claim 2, wherein the rod-shaped mold member is caused to rotate.