JPH11320531A - Concrete form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete form wherein concrete can be molded and removed from the form by a simple operation using a very simple construction. SOLUTION: Peripheral walls 3 and a bottom wall 4 enclosing a forming space 2 for forming a concrete are provided, and at least a portion of the lower part of the walls 3 and the wall 4 is formed from an elastic material. A blowoff part 5 for blowing off a pressurized fluid into the forming space 2 is provided in the part formed from the elastic material. And the blowoff part 5 is formed so that when the pressure of the pressurized fluid is not applied to the part 5, the inner surface 6 thereof facing the space 2 is closed, while when the pressure of the fluid is applied to the surface 6, the surface 6 is opened to allow the pressurized fluid to blow off into the space 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete form for forming concrete, and more particularly to a concrete form for forming a concrete specimen.

[0002]

2. Description of the Related Art Conventionally, various forms have been proposed as concrete forms for molding concrete. For example, Japanese Patent Publication No. 60-56082 proposes a concrete specimen form in which a protruding portion is provided on the inner periphery of the lower end of a cylindrical side plate, and the protruding portion supports the bottom plate. In this mold, the concrete specimen is released from the mold by applying a pressing force to the bottom plate from below to above.

In Japanese Utility Model Publication No. 1-39525,
For making a concrete test piece consisting of a bottomed cylindrical body with a through-hole formed at the bottom for introducing a compressive fluid, and a sheet laid on the bottom of the bottomed cylindrical body so as to cover the through-hole. Formwork has been proposed. In this formwork,
A concrete test piece is formed on a sheet laid on the bottom surface, and then the concrete test piece is released from the through hole by introducing a compressive fluid.

Further, in Japanese Patent Application Laid-Open No. Hei 6-31714, a metal cylindrical side plate and a bottom plate are provided, and a range from the upper surface of the bottom plate to the lower end of the inner peripheral surface of the side plate is defined as follows.
2. Description of the Related Art A concrete specimen molding form having an ejection hole for ejecting compressed air has been proposed. In this publication,
In one embodiment, after the ejection hole formed in the center of the bottom plate is sealed with a sealing device such as a bolt, a concrete specimen is formed, and then the sealing device is removed and compressed air is sent from the ejection hole. It describes that a concrete specimen is pushed upward by pressure and demolded.
Further, as another aspect, an annular concave portion is formed in the bottom plate at a position facing the lower surface of the side plate, a soft packing is provided in the annular concave portion, and a gap is formed at a position on the side plate facing the packing. It describes that after molding a concrete specimen, compressed air is sent into the gap to compress and shrink the packing, to flow the compressed air into the inside of the formwork, and to lift the concrete specimen to remove the mold. .

[0005]

However, the concrete form described above has the following disadvantages. That is, in the formwork described in Japanese Patent Publication No. 60-56082, it is necessary to form a projecting portion on the inner periphery of the lower end of the cylindrical side plate, and the bottom plate supported by the projecting portion is adjusted to the size of the side plate. Therefore, a plurality of members are required, and the configuration is slightly complicated. In addition, the bottom plate is extruded upward together with the concrete specimen at the time of demolding, so that every time the molding is performed, the bottom plate must be supported by the protruding portion, which complicates the operation.

Similarly, the form described in Japanese Utility Model Publication No. 1-39525 also requires a plurality of members consisting of a bottomed cylinder and a separate sheet. In addition, since the sheet is extruded upward together with the concrete test piece at the time of demolding, the sheet must be laid on the bottom surface every time molding is performed, which complicates the operation.

Further, in the form described in Japanese Patent Application Laid-Open No. 6-31714, in the above-described embodiment, a plurality of members are required because a separate sealing member is used in addition to the form. In addition, at the time of molding, the ejection hole is sealed with a sealing tool, while at the time of demolding, the sealing tool has to be removed and compressed air must be sent into the ejection hole, so that the operation is complicated. In the embodiment described later, an annular concave portion is formed in the bottom plate, packing is provided in the concave portion, and a gap must be formed in the side plate, so that the configuration is very complicated and cost increases. Invite.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to have a very simple configuration and to perform molding and demolding of concrete by a simple operation. To provide a concrete formwork.

[0009]

According to one aspect of the present invention, there is provided a concrete formwork having a peripheral wall and a bottom wall surrounding a molding space for molding concrete. At least a part of the bottom part of the peripheral wall and the bottom wall is formed of an elastic material, and a part formed of the elastic material has a jetting part for jetting a pressurized fluid toward the molding space. Is provided, so that when the pressure by the pressurized fluid is not applied, the inner surface facing the molding space is closed, and when the pressure by the pressurized fluid is applied, the inner surface is opened. It is characterized in that the pressurized fluid is ejected toward the molding space.

According to such a configuration, the inner surface of the ejection portion facing the molding space is closed when no pressure is applied by the pressurized fluid. Therefore, at the time of molding, since the concrete can be poured in a state where the inner surface is closed, the poured concrete does not leak from the spouting portion, and also faces the inner surface of the obtained concrete molded body. There is no unevenness in the portion. Also, since the inner surface is opened when pressure by the pressurized fluid is applied, when removing the mold, only the pressure by the pressurized fluid is applied to the ejection part, and the inner surface is opened to form the pressurized fluid. It can be ejected toward the space, and the concrete molded body can be easily removed from the mold.

The invention described in claim 2 is the first invention.
In the invention described in (1), the peripheral wall and the bottom wall are integrally formed of the elastic material. When the peripheral wall and the bottom wall are integrally formed of an elastic material, it is not necessary to partially form the bottom or the bottom wall of the peripheral wall with an elastic material in order to provide the ejection portion, so that the configuration can be simplified and reduced. A concrete form can be obtained in a process and in a short time. In addition, since the peripheral wall is formed of an elastic material, when the concrete molded body is removed from the mold, it can be favorably removed by its elasticity. Therefore, for example, unlike the case where the peripheral wall is formed of a rigid material, it is not necessary to form a draft that gradually widens from the lower end to the upper end of the peripheral wall, and forms the peripheral wall with the same internal dimensions from the lower end to the upper end of the peripheral wall. it can.

Further, the invention described in claim 3 is the first invention.
Or the hardness of the elastic material described in Types D and A described in JIS K6253.
Is in the range of D80 to A60 in terms of hardness measured with a durometer. The hardness of the elastic material is D80
If it is in the range of ~ A60, the inner surface facing the molding space in the spouting portion has a strength capable of favorably supporting the concrete to be molded in a closed state, and when pressure by the pressurized fluid is applied, The opening can be opened well and the pressurized fluid can be ejected.

The invention described in claim 4 is the first invention.
In the invention according to any one of the first to third aspects, the ejection section has a nozzle insertion section for receiving a nozzle for discharging the pressurized fluid. By inserting a nozzle for discharging a pressurized fluid into such a nozzle insertion portion, positioning and fixing of the nozzle can be easily performed.

The invention described in claim 5 is the first invention.
The concrete form of the invention according to any one of the above aspects is a form for a concrete specimen. As described above, the concrete form of the present invention is easily formed and removed from the mold, and the dimensional accuracy of the obtained concrete formed body is good. Therefore, the concrete form can be suitably used especially as a form for a concrete specimen. .

[0015]

FIG. 1 is a longitudinal sectional view of a concrete specimen form as one embodiment of a concrete form of the present invention. FIG. 2 is a concrete specimen form shown in FIG. FIG. 1 and 2, the concrete specimen form 1 has a substantially cylindrical shape with a bottom.
It has a cylindrical peripheral wall 3 surrounding a molding space 2 for molding concrete, and a disk-shaped bottom wall 4 closing an opening on the lower end side of the peripheral wall 3. The peripheral wall 3 and the bottom wall 4 are both integrally formed of an elastic material such as cast urethane elastomer. In addition, the peripheral wall 3 is formed such that the inner diameter from the lower end side to the upper end side is substantially the same diameter, and the outer diameter of the upper end part is slightly thick, and is gripped during transportation or the like. Easy to use.

In the concrete specimen mold 1 of this embodiment, in the present embodiment, an ejection section 5 for ejecting compressed air as a pressurized fluid toward the molding space 2 is provided at the center of the bottom wall 4. Is provided. The ejection portion 5 closes the inner surface 6 facing the molding space 2 when no pressure due to the compressed air is applied, and opens the inner surface 6 to apply the compressed air when the pressure due to the compressed air is applied. It is configured to spout toward 2. FIG. 3 and FIG. 4 are cross-sectional views of a main part showing the blowout part 5 of the concrete test piece form 1 shown in FIG. 1 in an enlarged manner. As shown in FIGS. 3 and 4, the ejection portion 5 is formed substantially at the center of the bottom wall 4, and has a nozzle insertion portion 9 for receiving a nozzle 8 for discharging compressed air, and a compression portion discharged from the nozzle 8. It has a compressed air guide passage 10 for ejecting air from the inner surface 6 toward the molding space 2. The nozzle insertion portion 9 has a depth from the outer surface 7 of the bottom wall 4 to an intermediate portion in the thickness direction of the bottom wall 4 and is formed as a substantially funnel-shaped groove that fits into the tip of the nozzle 8. . By providing such a nozzle insertion portion 9, positioning and fixing of the nozzle 8 can be easily performed, and compressed air can be reliably discharged from the nozzle 8 in a stable state. In addition, the compressed air guide path 10 extends from the nozzle insertion portion 9 to the bottom wall 4.
Is formed so as to penetrate the bottom wall 4 in the thickness direction toward the inner surface 6.

As shown in FIG. 3, when the nozzle 8 is not inserted into the nozzle insertion portion 9, that is, when the pressure by the compressed air is not applied, the compressed air guide path 10
In FIG. 4, the inner peripheral surface is tightly closed by elasticity, and the inner surface 6 facing the molding space 2 is kept closed.
As shown in the figure, the nozzle 8 is inserted into the nozzle insertion portion 9,
When the compressed air is discharged from the nozzle 8, the pressure of the discharged compressed air expands the inner peripheral surface of the compressed air guide path 10, which is in close contact with the compressed air guide path 10, and opens the inner surface 6 to generate compressed air. Spouted towards. Then, when the discharge of the compressed air by the nozzle 8 is stopped, the compressed air guide path 10 is tightly closed again by its elasticity, and the inner surface 6 facing the molding space 2 is closed.

As described above, the elastic material of the jetting portion 5 that opens and closes the inner surface 6 depending on the presence or absence of pressurization by compressed air is, for example, a hardness measured by a durometer of types D and A described in JIS K6253. D80
To A60 are preferable, and further, A9
Those in the range of 5-A70 are preferred. If the ejection part 5 is formed of an elastic material having such a hardness, it has a strength capable of favorably supporting the concrete to be molded in a state where the inner surface 6 is closed, and is excellent when the pressure by the compressed air is applied. And the compressed air can be blown out. Therefore, molding and demolding of concrete can be favorably performed. Further, as the elastic material having such hardness, the above-mentioned polyurethane elastomer is preferable, but other known rubber or plastic materials may be used.

The length of the compressed air guide path 10 is
Depending on the pressure of the air and the load of the concrete to be molded,
For example, the pressure of the compressed air is 7 to 8 kg /
cm ^TwoThe length of the compressed air guideway 10
Is about 0.1 to 20 mm, preferably about 0.5 to 5 mm
Degrees. Next, the concrete supply
A concrete specimen is manufactured using the specimen form 1.
A brief description of the method will be given. First, concrete
Concrete is filled into the molding space 2 of the sample form 1 and
Form concrete specimens. Next, the concrete supply
To remove the specimen, for example, as shown in FIG.
With the form 1 for concrete specimen upside down
11 and the nozzle 8 of the air gun is inserted into the nozzle insertion portion 9.
Insert and discharge compressed air. Then, the discharge
The inner surface 6 is opened by the pressure of the compressed air
The air is directed into the molding space 2 (the direction is indicated by an arrow 12).
You. ) The compressed air ejected and ejected into the molding space 2
Therefore, the form 1 for concrete specimens is
In the direction shown)
Specimen 14 (Concrete specimen is the same as
Only the reference numeral 14 indicates. ) Can be removed.

If a concrete specimen is manufactured by using the concrete specimen mold 1 as described above, the concrete can be poured in a state where the inner surface 6 is closed at the time of molding. There is no leakage from the spout 5 and no irregularities or the like are generated in the portion facing the inner surface 6 of the obtained concrete specimen. Then, at the time of demolding, the compressed air can be ejected toward the molding space 2 by opening the inner surface 6 only by applying the pressure of the compressed air to the ejection portion 5, so that the concrete specimen can be easily prepared. Can be demoulded. Accordingly, the concrete molded body can be removed from the concrete molded body by a simple configuration in which only the ejection section 5 is provided on the bottom wall 4 and by a simple operation of only applying a pressure of the compressed air to the ejection section 5. And even when the concrete specimen is repeatedly formed, even if the bottom plate or the sheet is not disposed at the bottom every time, the concrete specimen can be molded as it is, and the concrete specimen can be manufactured with high productivity by a simple operation. .

Further, the concrete test piece form 1
Since the peripheral wall 3 and the bottom wall 4 are integrally formed of an elastic material, there is no need to partially form the elastic material in order to provide the ejection portion 5, so that the configuration can be simplified, the number of steps can be reduced, and the number of steps can be reduced. The concrete specimen form 1 can be obtained in a short time. Further, since the peripheral wall 3 is formed of an elastic material,
When the concrete specimen is released, it can be removed satisfactorily by its elasticity. Therefore, for example, unlike the case where the peripheral wall 3 is formed of a rigid material such as a metal, it is not necessary to form a draft that gradually widens from the lower end to the upper end of the peripheral wall 3. A peripheral wall can be formed with the inner diameter. Therefore, a concrete specimen with high dimensional accuracy can be obtained.

In the present embodiment, the concrete specimen form 1 has been described as an example, but the present invention is not limited to the concrete specimen form 1 at all.
As long as it is a mold for molding concrete, it is not limited to a cylindrical shape with a bottom, and may be any other shape such as a rectangular box shape. Further, in the present embodiment, the peripheral wall 3 and the bottom wall 4 are integrally formed of an elastic material, but may be joined after forming the peripheral wall 3 and the bottom wall 4 respectively.
As long as at least the ejection portion 5 is formed of an elastic material, the other portions of the peripheral wall 3 and the bottom wall 4 may be formed of a rigid material such as a metal.

Further, in the present embodiment, the jetting portion 5 is provided at the center of the bottom wall 4, but the position is not particularly limited as long as it is the bottom of the peripheral wall 3 and the bottom wall 4, and for example, as shown in FIG. As described above, the ejection section 5 may be provided at the bottom of the peripheral wall 3, more specifically, at a position where the compressed air guide path 10 opens on the upper surface of the bottom wall 4. Further, the nozzle insertion portion 9 may not be particularly provided, and the compressed air guide path 10 may be closed when the inner peripheral surface thereof is tightly closed by elasticity when pressure by compressed air is not applied. It may be formed in any shape such as a shape or a split shape. Further, in this embodiment, when the pressure by the compressed air is not applied,
The compressed air guide passage 10 has its inner peripheral surface tightly closed by elasticity and is closed, and the inner surface 6 facing the molding space 2 is kept in a closed state. In this closed state, the inner surface 6 is completely closed. Not only in the closed state, but also during concrete molding,
This includes a state in which the concrete is slightly opened so as not to leak due to the surface tension of the concrete.

In the present embodiment, compressed air is used as the pressurized fluid. However, any fluid that can be pressurized can be used regardless of liquid or gas. Preferably, a compressive fluid is used, whose volume is reduced by application of pressure.

[0025]

As described above, according to the first aspect of the present invention, a simple structure in which only the ejection portion is provided at the bottom of the peripheral wall or the bottom wall, and the pressure by the pressurized fluid is applied to the ejection portion. The concrete molded body can be released from the mold by a simple operation of only adding the concrete. Also, when forming repeatedly, it is not necessary to arrange a bottom plate or a sheet at the bottom every time, and the forming can be performed as it is. Therefore, a concrete formwork excellent in workability can be provided with a simple configuration.

According to the second aspect of the present invention, since the peripheral wall and the bottom wall are integrally formed of an elastic material, the structure can be simplified, and a concrete form can be obtained in a small number of steps and in a short time. In addition, since the peripheral wall can be formed with the same internal dimensions from the lower end to the upper end of the peripheral wall, a concrete molded body with high dimensional accuracy can be obtained. According to the third aspect of the present invention, the hardness of the elastic material is D80 to A6.
In the range of 0, the inner surface facing the molding space in the jetting part, in a closed state, favorably supports the concrete to be molded, and opens well when the pressure of the pressurized fluid is applied. Since the pressurized fluid can be ejected, the molding and demolding of concrete can be performed more favorably.

According to the fourth aspect of the present invention, by inserting the nozzle for discharging the pressurized fluid into the nozzle insertion portion,
The nozzle can be easily positioned and fixed. Therefore, the pressurized fluid can be reliably discharged from the nozzle in a stable state, and the concrete molded body can be more appropriately removed from the mold. According to the invention as set forth in claim 5, by using the concrete form of the present invention as a form for a concrete specimen, molding and demolding are facilitated, and a concrete specimen with good dimensional accuracy can be obtained. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a concrete test form as one embodiment of a concrete form of the present invention.

FIG. 2 is a bottom view of the concrete test form shown in FIG. 1;

FIG. 3 is an enlarged cross-sectional view of a main part of a spouting part of the concrete specimen formwork shown in FIG. 1;

FIG. 4 is an enlarged cross-sectional view of a main part of a spouting part of the concrete specimen formwork shown in FIG. 1;

FIG. 5 is an explanatory view showing a state in which the concrete specimen is removed from the concrete specimen mold shown in FIG. 1;

FIG. 6 is a side view of a main part showing an aspect in which the ejection part is provided at the bottom of the peripheral wall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Form frame for concrete specimens 2 Molding space 3 Perimeter wall 4 Bottom wall 5 Jetting part 6 Inner surface 8 Nozzle 9 Nozzle insertion part

Claims (5)

[Claims] 1. A concrete formwork having a peripheral wall and a bottom wall surrounding a molding space for molding concrete, wherein at least a part of the bottom of the peripheral wall and the bottom wall is formed of an elastic material. An ejection portion for ejecting a pressurized fluid toward the molding space is provided at a portion formed of the elastic material, and the ejection portion is configured to perform the molding when pressure by the pressurized fluid is not applied. So that the inner surface facing the space closes,
A concrete formwork characterized in that when pressure is applied by the pressurized fluid, the inner surface is opened to eject the pressurized fluid toward the molding space. 2. The apparatus according to claim 1, wherein said peripheral wall and said bottom wall are integrally formed of said elastic material.
Concrete formwork according to 4. 3. The hardness of the elastic material is JIS K62.
The concrete formwork according to claim 1, wherein the hardness measured by a durometer of types D and A described in 53 is in a range of D80 to A60. 4. 4. The concrete form according to claim 1, wherein the jetting portion has a nozzle insertion portion for receiving a nozzle for discharging the pressurized fluid. . 5. The concrete form according to claim 1, which is a form for a concrete specimen.