JP2009190225A - Mold for concrete sample - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a lightweight inexpensive synthetic resin molding of simple constitution, as a mold for a concrete sample, to easily take out the sample from the mold by manual work, without using a tool or the like, and to reduce the amount of spent mold that is waste. <P>SOLUTION: This mold 10 for the concrete sample comprising a thin cylindrical body 11 integrated with a peripheral wall 11a made of a synthetic resin, and a bottom part 11b with a hole, and is provided, between upper and lower ends in the peripheral wall, with a plurality of cut grooves 14 connected by a tearable very thin-walled bottom 14a, and a pair of tearing knobs 15 in an opposed position opposed to an upper rim of the cylindrical body, and a holeless bottom plate 12 is engaged on the bottom part of the cylindrical body by pressing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a specimen form for molding a concrete specimen to be subjected to a strength test.

The concrete specimen used for the strength test is a columnar body having a height twice as large as the diameter, and the filling of the concrete into the mold for the specimen is performed according to JIS A 1132 concrete strength test specimen. It is done according to how to make.
Conventionally, as a form for a concrete specimen of this type, one in which a bottom plate is press-fitted into the bottom of a transparent or translucent synthetic resin tubular body is known from Patent Document 1 or the like, and in Patent Document 2, It is known that a bottom plate is detachably attached to one end of a cylindrical body to form a mold, and a film having a smooth surface is inserted into the mold to cover the inner peripheral surface of the cylindrical body with the film. It has been. Further, a metal can is often used in which the mold is formed and the can is broken with a special tool after the specimen is molded.

  In the mold as in the above-mentioned Patent Document 1, it is necessary to press the bottom plate or the molded specimen itself from the lower part for removing the mold, but when air pressure is used, it is necessary to provide an introduction passage for the air pressure. Therefore, the structure becomes relatively complicated, and when a mechanical operating force is used, it is necessary to prevent the molded specimen from being damaged. Will increase. Further, in the case where the inner peripheral surface of the mold is covered with a film having a smooth surface as disclosed in Patent Document 2, the film is deformed when the concrete sample is filled in the mold. It is easy, and depending on the deformation, an appropriate specimen may not be obtained.

In addition, when using a mold made of the above metal can, it is necessary to use a special tool for taking out the specimen, which may damage the specimen to be taken out or damage the fingers. In addition, in the production of concrete specimens, there is a process in which a sample filled in a mold for curing and curing is left for a long time, while the mold filled with the sample is left in a place exposed to direct sunlight. If this happens, the metal can will become very hot and the concrete sample will be heated abnormally, resulting in moisture dissipation and deterioration in quality due to heat, so metals with poor thermal insulation are basically suitable materials for the specimen formwork. That is not to say.
JP 2001-205612 A JP-A-63-124931

The technical problem of the present invention is that the mold for a concrete specimen is configured as a lightweight and inexpensive synthetic resin molded product with a simple configuration, and a tool or the like is not required for removing the specimen from the mold. Therefore, it is easy to take out by hand, and the used formwork which becomes waste is to be made only with a small amount of synthetic resin material.
Another technical problem of the present invention is to place a specimen under curing or curing in an appropriate environment so that a specimen of good quality can be manufactured.

  In order to solve the above-mentioned problems, a first form for a concrete specimen of the present invention is a concrete specimen made of a synthetic resin made of a thin cylindrical body in which a cylindrical peripheral wall and a perforated bottom are integrated. A mold for molding, provided with a plurality of kerfs connected by tearable ultra-thin bottoms between upper and lower ends of the peripheral wall of the cylindrical body, and facing the upper lip of the cylindrical body The position is provided with a pair of knobs for tearing the peripheral wall at the kerf, and a non-porous bottom plate is press-fitted on the bottom of the cylindrical body.

  In a preferred embodiment of the concrete specimen mold according to the present invention, the kerfs are provided in parallel on both sides of the knob provided at the position opposite to the upper lip of the cylindrical body, or the knob described above. The kerf provided on both sides is formed into a V shape that is integrated at the lower end of the cylindrical body.

  In addition, the second form for a concrete specimen of the present invention for solving the above-mentioned problems is a concrete sample made of a synthetic resin and made of a thin cylindrical body in which a cylindrical peripheral wall and a perforated bottom are integrated. A mold for molding a specimen, wherein a plurality of kerfs connected by an extremely thin bottom capable of tearing are provided between upper and lower ends of a peripheral wall of the cylindrical body, and an upper lip of the cylindrical body A flange is provided on the outer side of the flange, and a slit for tearing the kerf by tearing with the inserted coin is provided at a position corresponding to the kerf in the flange, and a non-porous hole is formed on the bottom of the cylindrical body. The bottom plate is press-fitted.

  In the first and second concrete specimen molds according to the present invention described above, the bottom of the perforated hole can be provided with a kerf connected to the lower end of the kerf of the peripheral wall, or the cylindrical shape. It can be provided with a high-strength mantle body that is formed in a cylindrical shape that is externally fitted to the body and that suppresses deformation by external fitting to the cylindrical body.

A mold for a concrete specimen having the above-described configuration is obtained by inserting a cylindrical body into a cylindrical body using a high-strength outer shell as necessary when molding the specimen. • Fill the sample and cure and cure it. If the specimen is not deformed even if the specimen is molded using only the cylindrical body, it is not always necessary to use the mantle.
The above formwork is broken to become waste after being used for molding the specimen. Therefore, it is desirable that the formwork be made as thin as possible within a range that can be used only by the formwork. Therefore, if there is a concern about insufficient strength and insufficient strength, it is possible to reduce the waste as much as possible by fitting a mantle body that can be used repeatedly with high strength.

  When the concrete specimen hardened and cured in the mold is taken out of the mold, in the case of the first concrete specimen mold, a pair of knobs provided on the upper lip of the peripheral wall of the cylindrical body By pulling on the both sides of the knob, the cylindrical body may be broken along a pair of extremely thin-walled kerfs provided on the circumferential wall of the cylindrical body on both sides of each knob. It can be easily taken out.

  Moreover, in the case of the above-mentioned second concrete specimen formwork, by inserting coins into the pair of slits at opposite positions in the flange provided outside the upper lip of the cylindrical body, A cylindrical body is formed along the pair of kerfs by generating a cut in the kerf of the ultrathin bottom wall of the cylindrical wall surrounding the slit, and then pulling a knob provided on both sides of the upper end of the cylindrical wall. The peripheral wall can be broken, and in this case as well, the specimen can be easily and easily removed by hand.

  In addition, although the form for molding the concrete specimen was described here, it is a solidified material mixed with a solidifying material to solidify it on a part of the ground, or other material similar to concrete for civil engineering construction. Thus, the present invention can also be applied to a mold for forming a specimen to be subjected to a strength test.

  In the present invention described in detail above, the concrete specimen mold can be configured as a lightweight and inexpensive synthetic resin molded article with a simple configuration, and a tool can be used to remove the specimen from the mold. Etc., and can be easily taken out manually, and the used formwork as waste can be made of only a small amount of synthetic resin material. In addition, since the cylindrical body is formed of a synthetic resin having a low thermal conductivity, the specimen under curing or curing can be placed in an appropriate environment to produce a specimen with good quality.

  1 to 7 show a first embodiment of a concrete specimen mold according to the present invention. The mold 10 of the first embodiment is basically a cylindrical body 11 made of a synthetic resin and a bottom plate 12 made of a metal plate or a synthetic resin and press-fitted to the bottom of the cylindrical body 11 (FIG. 6) and a mantle body 13 (see FIGS. 6 and 7) that fits around the cylindrical body 11 used as necessary. Further, a lid (not shown) attached to the cylindrical body 11 or the outer body 13 is used as necessary.

  As shown in FIG. 6, the cylindrical body 11 made of synthetic resin is a thin-walled body in which a cylindrical peripheral wall 11a and a perforated bottom portion 11b are integrated, and can be torn between the upper and lower ends of the peripheral wall 11a. A plurality of kerfs 14 connected at a very thin bottom 14 a are provided in parallel, and a pair of knobs 15 for tearing the peripheral wall 11 a at the kerfs 14 at positions opposite to the upper lip of the cylindrical body 11. Are provided integrally. In the first embodiment, the kerfs 14 are provided on both sides of the knob 15, but the kerfs 14 are not necessarily limited to one, and a position where the ultrathin bottom 14 a can be easily cut by pulling the pair of knobs 15. As long as it is provided. At the upper end of the peripheral wall 11a of the cylindrical body 11, a flange 11c for increasing the strength is provided as necessary.

In addition, on the inner surface of the cylindrical body 11, in order to facilitate the molding of the cylindrical body 11 itself and the demolding of the specimen material filled in the cylindrical body 11, the inner surface of the cylindrical body 11 is slightly upward within the standard dimension allowable range. An open taper is attached.
Further, the bottom 11b formed integrally with the peripheral wall 11a is a hole, but the hole 16 is used for facilitating demolding of the cylindrical body 11 and for facilitating press fitting of the bottom plate 12. Since it aims at ventilation | gas_flowing, it can be set as the arbitrary forms for providing air permeability. Further, the bottom 11b is provided with a cut groove 17 connected to the lower end of the cut groove 14 in the peripheral wall 11a to make it easier to take out the specimen from the cylindrical body 11.

  A non-porous bottom plate 12 made of metal (iron plate) is press-fitted onto the bottom 11b of the cylindrical body 11, and the bottom plate 12 has a slightly larger peripheral surface 12a with a large diameter on the upper side. By forming a tapered surface and press-fitting it into the peripheral wall 11a, water tightness around the bottom plate 12 can be secured. However, a taper portion for bottom plate press-fitting is formed at the portion of the peripheral wall 11a in the cylindrical body 11 where the bottom plate 12 is press-fit, and the bottom plate is press-fit to the taper portion. Thus, water tightness around the bottom plate can be secured.

  Since the mold 10 becomes waste after being used for molding of the specimen, the waste is reduced by reducing the thickness as much as possible within the range that can be used only by the mold 10. be able to. If there is a concern about insufficient strength, the outer shell 13 made of synthetic resin that can be used repeatedly with high strength as shown in FIGS. 6 and 7 is externally fitted to increase the strength. Can be reduced as much as possible. If the specimen is not deformed even if the specimen is molded using only the cylindrical body 11, it is not always necessary to use the jacket 13.

  Also, in the production of concrete specimens, if the sample filled in the mold 10 for curing or curing is left in a place where it is exposed to direct sunlight for a long time, the concrete sample will be abnormally heated, and moisture diffusion and heat However, the deterioration of the quality of the specimen can be suppressed by forming a heat insulating layer having a low thermal conductivity around the outer shell 13. In this case, the outer jacket 13 is not necessarily limited to being made of synthetic resin, and can be formed of an arbitrary cylindrical member having low thermal conductivity.

When the specimen is molded by the concrete specimen mold 10 having the above-described configuration, the mold 10 in which the bottom plate 12 is press-fitted on the bottom portion 11b in the cylindrical body 11 is attached to the outer shell 13 as necessary. After being inserted inside, the cylindrical body 11 is filled with a concrete sample, which is cured and cured.
When the concrete specimen hardened and cured in the mold 10 is taken out from the mold 10, each knob is pulled by pulling a pair of knobs 15 provided on the upper edge of the peripheral wall 11a of the cylindrical body 11 on both sides. Since the ultra-thin bottom 14a is broken along the pair of cut grooves 14 on both sides of 15, the test specimen molded by opening the peripheral wall 11a of the cylindrical body 11 can be taken out. In this way, the specimen can be removed simply and easily by hand.

  8 to 12 show a second embodiment of the test mold according to the present invention. The mold 20 of the second embodiment is mainly different from the first embodiment in the position of the kerf. That is, in the second embodiment, the cut grooves 24 provided on both sides of the knob 25 similar to the first embodiment and connected by the ultrathin bottom 24a are provided at the lower end of the peripheral wall 21a of the cylindrical body 21. Are formed into a V-shape integrated with each other. The V-shaped kerf 24 facilitates the tearing of the very thin bottom 24 a of the kerf 24 by the knob 25. Accordingly, a kerf 27 that is continuous with the kerf 24 at the bottom 21b is configured as a single kerf 27 at the center of the bottom 21b.

  Since the other configurations and operations in the second embodiment are not particularly different from those in the first embodiment, the same reference numerals as those in the first embodiment are used in FIGS. A description thereof will be omitted. In the second embodiment, the one corresponding to the flange 11c of the first embodiment is not provided. Also in the second embodiment, the outer body 13 can be used as in the case of the first embodiment.

  13 to 19 show a third embodiment of the test mold according to the present invention. The concrete specimen mold 30 of the third embodiment is connected between the upper and lower ends of the peripheral wall 31a of the cylindrical body 31 with an extremely thin bottom 34a that can be torn, as in the first and second embodiments. A plurality of kerfs 34 are provided. In order to make a cut at the upper end of the ultrathin bottom 34a of the kerfs 34 when the specimen is taken out, the above-mentioned kerfs 34 are formed outside the upper lip of the cylindrical body 31. A flange 31c having a pair of reinforcing portions 31d is provided on both sides of a position corresponding to the groove 34, and a coin is inserted between the pair of reinforcing portions 31d in the flange 31c and then the cut groove 34 is torn. A slit 38 is provided.

Also in the third embodiment, a knob 35 for tearing the body portion 31a of the cylindrical body 31 in the kerf 34 is provided at a position facing the upper lip of the cylindrical body 31. Is provided at a position opposite to each other between the pair of knobs 35. The kerf 37 in the bottom 31b of the cylindrical body 31 is also provided at a position continuous with the lower end of the kerf 34 of the body 31a.
Further, since the reinforcing portion 31d for forming the slit 38 is provided in the flange 31c, the outer body 33 in the third embodiment is provided with a notch 33c for receiving the reinforcing portion 31d. .

  The mold 30 according to the third embodiment having the above-described configuration is configured such that coins are inserted into the slits 38 at opposing positions in the flange 31c provided outside the upper rim of the cylindrical body 31 when the specimen is taken out. By generating a cut in the ultrathin wall bottom 34a in the cut groove 34 of the cylindrical body peripheral wall 31a continuous with the slits 38, and then pulling the knobs 35 provided on both sides of the upper end of the peripheral wall of the cylindrical body 31 to both sides The cylindrical body peripheral wall 31a can be broken along the pair of cut grooves 34, and in this case, the specimen can be easily and easily removed by hand.

  Since other configurations and operations in the third embodiment are substantially the same as those in the first embodiment, the same reference numerals as those in the first embodiment are assigned to portions common to the first embodiment in the drawings. The description about is omitted.

It is a front view which shows 1st Example of the mold for concrete specimens which concerns on this invention. It is the same side view. It is the same top view. It is the bottom view. It is a horizontal sectional view in the AA position of FIG. It is a longitudinal cross-sectional view of the state where the above-mentioned formwork was inserted in the mantle. It is the same perspective view. It is a front view which shows 2nd Example of the mold for concrete specimens which concerns on this invention. It is the same side view. It is the same top view. It is the bottom view. It is a horizontal sectional view in the BB position of FIG. It is a front view which shows 3rd Example of the mold for concrete test bodies which concerns on this invention. It is the same side view. It is the same top view. It is the bottom view. It is a horizontal sectional view in the CC position of FIG. It is a longitudinal cross-sectional view of the state where the above-mentioned formwork was inserted in the mantle. It is the same perspective view.

Explanation of symbols

10, 20, 30 Formwork 11, 21, 31 Cylindrical body 11a, 21a, 31a Peripheral wall 11b, 21b, 31b Bottom 12 Bottom plate 13, 33 Outer body 14, 24, 34 Cut groove 14a, 24a, 34a Very thin bottom 15 , 25, 35 Pick 31c Flange 38 Slit 17, 27, 37 Cut groove

Claims (6)

A mold for molding a concrete specimen made of a thin cylindrical body made of synthetic resin and integrated with a cylindrical peripheral wall and a perforated bottom,
Between the upper and lower ends of the peripheral wall of the cylindrical body, a plurality of kerfs connected by an extremely thin bottom that can be torn are provided,
A pair of knobs for tearing the peripheral wall at the kerf is provided at a position opposite to the upper lip of the cylindrical body,
A non-porous bottom plate is press-fitted onto the bottom of the cylindrical body,
A form for a concrete specimen characterized by that. The kerfs are provided in parallel on both sides of the knob provided at the opposite position of the upper lip of the cylindrical body,
The form for a concrete specimen according to claim 1. The kerf provided on both sides of the knob is formed in a V shape that is integrated at the lower end of the cylindrical body,
The form for concrete specimens according to claim 2 characterized by things. A mold for molding a concrete specimen made of a thin cylindrical body made of synthetic resin and integrated with a cylindrical peripheral wall and a perforated bottom,
Between the upper and lower ends of the peripheral wall of the cylindrical body, a plurality of kerfs connected by an extremely thin bottom that can be torn are provided,
A flange is provided on the outer side of the upper lip of the cylindrical body, and a slit for tearing the kerf is provided at a position corresponding to the kerf in the flange by prying with the inserted coin.
A non-porous bottom plate is press-fitted onto the bottom of the cylindrical body,
A form for a concrete specimen characterized by that. The bottom of the perforated hole is provided with a kerf connected to the lower end of the kerf of the peripheral wall,
The form for concrete specimens according to claim 1, wherein: It is formed in a cylindrical shape that is externally fitted to the cylindrical body, and includes a high-strength outer shell that suppresses deformation by external fitting to the cylindrical body.
The form for concrete specimens according to claim 1, wherein:

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