JPH05162113A - Method for molding concrete product and drawable form - Google Patents

Abstract

PURPOSE:To make it possible to mold a concrete product by removing it from a mold in an efficient manner without the need to apply a releasing agent and to execute fabrication and design of a drawable form without requiring any technical knowledge and skill at a low cost, so that the concrete product such as soil water pit, storm water pit, etc., can be removed from a mold in an optimum manner. CONSTITUTION:A mold releasing sheet 4' is applied to the inner surface of at least one of an outer mold 1 or an inner mold 3 through a resilient member 5 so that a concrete product K is removed after curing and solidification thereof to elastically deform the member 5, thereby forming a removal space S, with the result that the product K can be easily removed from the mold.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to, for example, a sewage cell, a rainwater cell,
The present invention relates to a molding method and a die for optimally releasing various concrete products such as pavement flat plates, straight pipes and curved pipes.

[0002]

2. Description of the Related Art Conventionally, as a concrete product, there is a sewage box for burying the sewage in the soil to manage the wastewater drainage.

This sewage box is a bottom block that connects a joint pipe for flowing sewage from the upstream side to the downstream side, and a side block that is piled on the upper surface of the bottom block to adjust the height of burial from the surface of the earth. It was formed from a block and an edge block that is stacked above the side block to cover the lid.

Conventionally, for molding an edge block, for example, as shown in FIG. 17, an outer mold 51 and an inner mold 5 provided on a base plate 50 and coated with a release agent on the inner surface or the outer surface thereof.
The concrete is poured into the molding space S ′ between the two to cure and solidify it, and then either the outer mold 51 or the inner mold 52 is removed to release the mold, and the curb block as the concrete product K ′ is removed. It was molded.

[0005]

However, in the conventional molding method shown in FIG. 17, the centers O'1 and O'2 of the outer die 51 and the inner die 52 are substantially coincident with each other and the outer die 51 is formed.
The inner mold 52 and the inner mold 52 are positioned substantially horizontally on the base plate 50, and if not tilted (nearly vertical condition), the concrete is cured and solidified. When the mold 51 and the inner mold 52 are removed by pulling out the mold 51 and the inner mold 52, the outer mold 51 and the inner mold 52 are concrete products K ′.
The inner and outer surfaces of the concrete product could not be removed in competition with each other, and the concrete product K ′ could not be easily released from the mold.

Therefore, in the conventional molding method, the yield of the concrete product K'is low and the production efficiency is low.

In order to overcome this inconvenience, conventionally, a mold releasing agent is conventionally applied to the inner surface or the outer surface of the outer mold 51 and the inner mold 52, as well as to the inner surface of the outer mold 51 or the outer surface of the inner mold 52. It was necessary to devise a method such as providing a draft to facilitate the removal of the product, or making the release mold a split mold for easy release. Therefore, in order to release the concrete product K ', it takes labor and time to apply a release agent, and the design of the die itself requires a high degree of skill and sophistication, and the die manufacturing cost is high. Was becoming.

Therefore, the present invention makes it possible to release a concrete product with good yield and efficiency without requiring labor such as applying a release agent, and has expertise in designing and producing a die. It is to make the structure simple and to reduce the manufacturing cost without requiring skill level.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to set concrete in a molding space formed between an outer mold and an inner mold for curing and releasing after solidification. As a concrete product manufacturing method to be performed, an elastic restoring component having a release sheet on the inner surface of at least one of the outer mold and the inner mold is mounted, and the elasticity of the elastic restoring component is used for mold release. The means to do was adopted.

Further, in the related invention, a concrete product having an outer frame and an inner frame is punched out, and a release sheet is attached to an inner surface of at least one of the outer die and the inner die through an elastic restoring component. I adopted the means.

[0011]

Since the release sheet is attached to the inner surface of at least one of the outer die and the inner die through the elastic restoring component, it is placed in the molding space formed between the outer frame and the inner frame. After the concrete to be cured is cured and solidified, the concrete product is moved to elastically deform the elastic restoration component to form an empty space between the outer mold and the inner mold, thereby releasing the concrete product.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A case where one embodiment of the present invention is applied to an edge block of a waste water box will be described with reference to FIGS. 1 to 3, reference numeral 1 denotes an outer die placed on a base plate 2, and the outer die 1 is detachably fixed to the base plate 2 as required.

Reference numeral 3 denotes an inner mold which is arranged on the base plate 2 at a predetermined position in the outer mold 1.

The outer die 1 is formed of a steel plate or plastic into a substantially cylindrical flat surface, and a release sheet 4 is formed on the inner peripheral surface thereof.
Is put on.

Further, the inner mold 3 is made of a steel plate or plastic formed in a substantially cylindrical shape having a diameter smaller than that of the outer mold 1, and a release sheet 4'on its outer peripheral surface via an elastic restoring component 5. Are deposited on the surface.

In order to apply the release sheet 4'to the surface of the elastic restoration component 5, the release sheet 4'is bonded to the elastic restoration component 5 with an adhesive or the like.

In this embodiment, the elastic restoring component 5 having the release sheet 4'applied to the surface is attached to the outer peripheral surface of the inner mold 3, but the present invention is not limited to this, and as shown in FIG. The restoration component 5 may be attached to the inner peripheral surface of the outer mold 1 together with the release sheet 4 ', or may be attached to both the inner and outer peripheral surfaces of the outer mold 1 and the inner mold 3.

The release sheets 4 and 4'have good release properties for the concrete product K, have high strength against tension, compression, friction, heat, etc., and have acid resistance, alkali resistance and chemical resistance. In addition, a material that has excellent flexibility and can be used repeatedly, for example, a synthetic resin thin film such as Teflon resin or polyethylene is preferably used.

As the elastic restoring component 5, a material which is elastically deformable and has excellent restoring force, for example, a synthetic resin sponge or a rubber sheet is used. Other than this, although not shown in the drawing, a coil spring or a plate is used. By using a mechanical spring component such as a spring, it elastically deforms when pressed and restores when the pressing is released.

When the release sheet 4'is mounted on the outer peripheral surface of the inner mold 3 or the like by using the spring parts as described above, the outer periphery of the substantially cylindrical holder having a diameter slightly larger than that of the inner mold 3. If the release sheet 4'is fixed to the surface and this holder is attached to the outer peripheral surface of the inner mold 3 through the spring component, the spring component is elastically deformed by pressing to exhibit the spring property and the release property. The mold sheet 4'can be held so that it can be used repeatedly with sufficient strength.

Reference numeral 6 denotes a space holding component. The space holding component 6 is formed in a plane substantially annular shape and has a side plate shape so that the center O of the outer die 1 and the center O'of the inner die 3 substantially coincide with each other. By positioning the outer mold 1 and the inner mold 3 and assembling them on the base plate 2, concrete is placed between the outer mold 1 and the inner mold 3 to mold the concrete product K. The dimension of the molding space S is ensured.

Reference numeral 6a is an opening of a substantially circular plane which is provided in the spacing member 6 so that the inner mold 3 can be removably inserted and assembled.

Reference numeral 7 denotes a step forming component fixed to the upper surface on the inner peripheral side of the spacing member 6 and having a substantially L-shaped cross section and formed in a substantially planar shape. The step forming component 7 covers the concrete product K. This is for forming a concave step portion for seating a body.

The spacing member 6 and the step forming member 7
A release sheet 4 is attached to the surface of the concrete product K in order to facilitate the release of the concrete product K.

Reference numeral 8 denotes a handle fixed to the upper end of a column 9 standing upright in the substantial center of the base plate 2, and by grasping the handle 8, the base plate 2 can be moved to a desired installation place.

Numeral 10 is an appropriate number of interval holding rods which are cantilevered in the radial direction of the column 9, and the interval holding rods 10 are provided.
By this, the mounting of the inner mold 3 mounted on the base plate 2 to the base plate 2 is positioned.

In order to mold the curb block as the concrete product K in the above structure, first, the plate-like spacing member 6 having a substantially annular plane is placed on the base plate 2 having the handle 8 at the substantially center thereof.

Next, the opening 6a provided in the spacing member 6
By inserting the inner mold 3 therein, the inner mold 3 is positioned and assembled with respect to the spacing member 6.

Further, the outer die 1 and the inner die 3 which are substantially opposed to each other by positioning and assembling the outer die 1 on the outer periphery of the spacing member 6 are provided.
A molding space S is formed between and (see FIGS. 1 and 2).

Thereafter, concrete is poured into the molding space S to cure and solidify.

After releasing from the mold, an elastic restoring component 5 formed by a synthetic sponge, a rubber sheet, or a mechanical spring component such as a coil spring (not shown) is provided on the outer peripheral surface of the inner mold 3. Since the release sheet 4'of a thin film of synthetic resin such as Teflon resin or polyethylene is adhered to the concrete product K by moving the concrete product K laterally (radially) as shown in FIG. When the elastic restoration component 5 is elastically deformed by pressing K,
A slight empty space S1 is formed between the outer die 1 and the inner die 3.

Therefore, by easily pulling out the concrete product K from the molding space S between the outer mold 1 and the inner mold 3, the curb block as the concrete product K can be released (see FIGS. 5 and 6).

At this time, since the release sheet 4 is adhered to the inner peripheral surface of the outer mold 1 and the surface of the side plate-shaped spacing member 6, the inner peripheral surface of the outer mold 1 of the concrete product K and The mold release from the space holding component 6 is also easy.

In addition, an empty space S1 is provided between the outer mold 1 and the inner mold 3.
Thus, the inner mold 3 or the outer mold 1 can be easily removed from the spacing member 6.

Moreover, as shown in FIG. 7, even when the release sheet 4'is adhered to the inner peripheral surface of the outer mold 1 through the elastic restoring component 5, the concrete product K is laterally moved after curing and hardening of the concrete. By moving in the direction, the elastic restoration component 5 is elastically deformed by the pressing to form the empty space S1 between the outer mold 1 and the inner mold 3 and thereby the concrete product K
Can be easily released.

8 to 10 show a modification of the die of the present embodiment. In this modification, the outer shapes of the outer mold 1, the inner mold 3 and the spacing member 6 are substantially cylindrical or plane substantially annular. Different from the above description, the outer mold 1, the inner mold 3, and the spacing member 6 are formed in a substantially square plane shape, so that a flat rectangular edge block is molded as the concrete product K. Different from the description.

FIG. 11 shows a second embodiment of the die according to the present invention. In this embodiment, a space holding component 6 is integrally formed below the inner surface of the outer mold 1 to maintain the space for the outer mold 1. The mounting and positioning of the component 6 is omitted, and the inner mold 3 is assembled so as to face the outer mold 1 so that the outer peripheral surface of the inner mold 3 is brought into contact with the inner end of the spacing member 6.
A concrete product K is molded by pouring concrete in a molding space S formed between the outer mold 1 and the inner mold 3 to cure and solidify it.

In this embodiment, the assembling of the punching mold at the time of placing concrete and the concrete product K
The manufacturing process of the concrete product K can be simplified by simplifying the work of removing the mold during the mold release as compared with the above embodiment.

Further, FIG. 12 shows a third embodiment of the die according to the present invention. In this embodiment, the space holding component 6 is formed on the outer surface of the inner mold 3 and below the space holding component 6 for the inner mold 3. By omitting the mounting and positioning work of the outer die 1 as compared with the first embodiment, and by assembling the outer die 1 by bringing the inner peripheral surface of the outer die 1 into contact with the outer end of the spacing member 6, The concrete product K is molded in a molding space S formed between the mold 1 and the inner mold 3.

Also in this embodiment, similarly to the second embodiment, the assembling of the die at the time of placing the concrete and the removal of the die at the time of releasing the mold are simplified to simplify the manufacturing process of the concrete product K. Be peeled off.

13 to 15 show a fourth embodiment of the punching die of the present invention. In this embodiment, as a concrete product K, a lid of an edge block as shown in FIGS. 9 and 10 is molded.

In this embodiment, an outer peripheral surface of an outer mold 21 having a substantially rectangular shape which is detachably mounted on the base plate 20, and an elastic restoring component 23 having a release sheet 22 on the surface inside the outer mold 21. Is formed on the base plate 20 and is fixed to the base plate 20 by fixing parts such as bolts.

In this embodiment, concrete is poured into the molding space S'formed between the outer mold 21 and the inner mold-shaped projection 24 to cure and solidify the concrete product K on the base plate 20. By moving and elastically deforming the elastic restoration component 23 attached to the outer periphery of the inner mold-like projection 24 by the pressing force, a void space is formed between the outer mold 21 and the inner mold-like projection 24 to form a concrete product. The point that K is easily released is different from the above-mentioned embodiments.

FIG. 16 shows a fifth embodiment of the present invention. In this embodiment, there is shown a die for forming a curved pipe having a receiving portion F with a flange as a concrete product K.
Step forming component 7 for forming the receiving portion F on the sloping base plate 2 which is erected about the center of the column 9 on which the handle 8 is mounted.
The space holding component 6 having the
An inner mold 3 having an elastic restoring component 5 whose outer surface is covered with a release sheet 4'on its outer peripheral surface and an outer mold 1 having a release sheet 4 on its inner peripheral surface are arranged substantially concentrically. By assembling the concrete product K in the molding space S between the outer mold 1 and the inner mold 3 and releasing the mold after releasing the concrete, the concrete product K is laterally moved to elastically deform the elastic restoration component 5. This is substantially the same as the first embodiment in that an empty space S1 is formed between the outer mold 1 and the inner mold 3 and the outer mold 1 and the inner mold 3 are removed to quickly release the mold.

[0045]

As described above, according to the present invention, since the release sheet is attached to the inner surface of at least one of the outer die and the inner die through the elastic restoring component, the inner surface of the outer die or The labor and time required to apply a release agent to the outer surface of the inner mold and the like can be saved, and the elastically restored parts can be elastically deformed to efficiently release the concrete product with a high yield.

Further, since it is not necessary to provide a draft in the die, unlike the conventional case, the structure of the die is simplified, specialized knowledge and skill in manufacturing and design are not required, and the die can be easily manufactured. Manufacturing costs are low.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a cross-sectional view of the same with the die removed.

FIG. 4 is an enlarged sectional view showing a main part of the same.

FIG. 5 is a plan view of a concrete product molded by using the die according to the present embodiment.

FIG. 6 is a sectional view of the same.

FIG. 7 is a cross-sectional view showing another application example of the present embodiment.

FIG. 8 is a cross-sectional view showing a modified example of this embodiment.

FIG. 9 is a plan view of a concrete product molded by using the die of this modification.

FIG. 10 is a sectional view of the same.

FIG. 11 is a cross-sectional view showing a disassembled state of the second embodiment of the punching die of the present invention.

FIG. 12 is a cross-sectional view showing a disassembled state of the third embodiment of the punching die of the present invention.

FIG. 13 is a sectional view showing a fourth embodiment of the punching die of the present invention.

FIG. 14 is a plan view showing a concrete product molded by the die cutting of the present embodiment.

FIG. 15 is a sectional view of the same.

FIG. 16 is a sectional view showing a fifth embodiment of the present invention.

FIG. 17 is a cross-sectional view showing a molding method for molding a concrete product using a conventional die.

[Explanation of symbols]

 1 Outer mold 2 Base plate 3 Inner mold 4 Release sheet 4'Release sheet 5 Elastic restoration component 6 Spacing holding component 20 Base plate 21 Outer mold 22 Release sheet 23 Elastic restoration component S Molding space S1 Extraction space K Concrete product

Claims (7)

[Claims] 1. A method for molding a concrete product, in which concrete is poured into a molding space formed between an outer mold and an inner mold to cure and solidify, and then the mold is released. A method for molding a concrete product, comprising mounting an elastic restoration component having a release sheet on the inner surface of at least one of the inner surfaces and releasing the mold by utilizing the elasticity of the elastic restoration component. 2. A concrete product having an outer mold and an inner mold is cut out, and a release sheet is attached to the inner surface of at least one of the outer mold and the inner mold via an elastic restoration component. Die cutting of concrete products. 3. The mold die for a concrete product according to claim 2, wherein the elastic restoring component is formed of any one of a synthetic sponge, a rubber sheet, and a spring component. 4. The mold release of a concrete product according to claim 2, wherein the release sheet is a synthetic resin thin film of Teflon resin, polyethylene or the like. 5. The mold release tool for a concrete product according to claim 2, wherein a space holding component that regulates a dimension of a molding space is interposed between the outer mold and the inner mold. 6. The spacing member is formed on the inner peripheral surface of the outer die, and the inner end of the spacing member is abuttable on the outer peripheral surface of the inner die. Die cutting of concrete products described in. 7. The spacing member is formed on the outer peripheral surface of the inner mold, and the outer end of the spacing member can contact the inner peripheral surface of the outer mold. Die cutting of concrete products described in.