JP2003337089A - Form for molding specimen for testing concrete strength - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide forms for molding a specimen for testing concrete strength capable of easily perform molding, being inexpensively manufactured, easily handled, and easily reused and from which the molded specimen can be easily extracted. <P>SOLUTION: The forms for molding the specimen for testing concrete strength is provided with a tube body 3 divided and constituted into two in a circumferential direction into two tube constituent materials 2 combinable in a tube shape; a bottom plate 4 capable of closing the lower-surface opening of the tube body 3, and a sheathing film made of a film 5A made of a thermoplastic synthetic resin film which sheathes the tube body 3 in a close contact state and integrally combines a plurality of the tube constituent materials 2 to each other and the tube body 3 to the bottom plate 4. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for molding a specimen for strength test of concrete.

[0002]

2. Description of the Related Art As a forming mold for producing a specimen for a strength test of concrete, a cast iron mold which can be used repeatedly according to the JIS standard and a metal plate such as a tin plate are used. A bottomed cylindrical shape or a plastic disposable container as disclosed in Japanese Patent Laid-Open No. 7-83811 is used. In addition, JP-A-6
In JP-A-307997, a side wall portion of a tubular body is configured to be divided into two along the axial direction of the cylindrical body, one side edge can be joined by a hinge structure, and the other side edge can be connected to each other. It is introduced that has a structure that can be opened and closed.

[0003]

Among these, the cast iron formwork specified in JIS standard is constructed by fixing the split side plates with bolts to form a bottomed cylindrical container. When removing the molded specimen, the bolts must be loosened and the side plate must be disassembled, and when reassembling, cleaning such as removal of adhered concrete is required and water leakage is prevented. In addition to the fact that grease or oily soil must be applied to the seams, it is heavy and unwieldy because it is made of cast iron, and it easily rusts, which requires a great deal of time and effort to use.

On the other hand, the form container formed by forming a thin metal plate such as tin plate into a cylindrical shape is easily deformed by impact, and when concrete is driven into a test sample, a side wall is directly attached to compact the concrete. Since it cannot be struck and the container itself is seamless, the side wall must be torn off with pliers, pliers, etc., and the sample must be taken out, which is time-consuming and scratches the sample during removal. There was a problem such as putting it on.

On the other hand, the formwork container introduced in Japanese Patent Laid-Open No. 7-83811 is a plastic cylindrical container having a metal plate as a bottom plate and a perforation line provided in advance on the side surface thereof. Although it is easier to take out the molded specimen compared to a formwork container or a formwork container formed by molding a thin metal plate such as tin plate, in cold weather use, the cut pieces are torn off while cutting the side wall. In addition, there was a problem that a considerable amount of force was required for cutting itself. In addition, since the deep cylindrical shape is integrally molded, the molding difficulty is high, and the diameter of the bottom is close to the lower limit due to the draft of the inner diameter against the dimensional tolerance of the diameter of the specimen specified in JIS. There was no choice but to set the diameter of the part near the upper limit value, and there was a high possibility that it would be out of the standard due to slight distortion or deformation. Furthermore, in order to prevent molding distortion due to the difference in shrinkage between the bottom portion and the mouth portion when insert-molding the metal plate as the bottom plate, the bottom plate is inserted in a later step and joined to the tubular body,
There is also a problem that the number of manufacturing steps is large and the cost is high to make it disposable.

The openable and closable formwork container disclosed in Japanese Patent Laid-Open No. 6-307997 is intended to facilitate the taking out of the specimen and to reuse the formwork container. However, deformation due to shrinkage strain after molding is likely to occur, it is difficult to adapt to the dimensional specifications of the specimen, and it is considered to be unsuitable for practical use because water leakage countermeasures during preparation of the specimen are insufficient.

An object of the present invention is to provide a concrete strength test specimen that is easy to mold, can be manufactured at low cost, is easy to handle, can easily take out the molded specimen, and can be easily reused. The purpose of the present invention is to provide a molding form.

[0008]

[MEANS FOR SOLVING THE PROBLEMS] A mold for molding a test specimen for concrete strength test according to the present invention comprises a tubular body which is circumferentially divided into a plurality of tubular components which can be assembled into a tubular shape, and the tubular body. A bottom plate capable of closing the lower surface opening, and a plurality of tubular components that are externally attached to the tubular body in close contact with each other, and an exterior film made of a thermoplastic synthetic resin film that integrally joins the tubular body and the bottom plate. It is equipped with.

[0009] This mold for molding a test specimen is formed by combining a plurality of tubular constituent materials to form a tubular body, and a bottom plate is assembled so as to close the lower opening of the tubular body.
A tubular exterior film made of a thermoplastic synthetic resin film is packaged, and the exterior film is heated and shrunk by a heating means such as an electric heater or a hot gun to integrally bond a plurality of tubular components together, and a tubular body. The bottom plate and the bottom plate are integrally joined to each other, and the shape is maintained so that they can be used as a mold for molding a specimen.

The cylinder component and the bottom plate (hereinafter referred to as the mold component) which compose the mold for molding the test piece may be a metallic material, a synthetic resin material, or a material that can be molded into a desired shape. It is also possible to form it by using cardboard or the like that has been subjected to water resistance treatment. For example, it is possible to form each cylinder component by a different material, for example, by making a cylinder component by injection molding using thermoplastics as a material and using a punched metal plate for the bottom plate. Considering the ease of manufacturing, the convenience of handling, the manufacturing cost, etc., it is preferable that all the mold component members are injection molded products made of thermoplastic synthetic resin. In particular, polyolefin synthetic resins such as polypropylene and polyethylene, and talc,
It is preferable to use a material in which a filler such as calcium carbonate is mixed, because the mold releasability when taking out the molded specimen is good. In addition, since the outer peripheral portion is strongly tightened with the exterior film after the mold component members are assembled, even if there is some warp or distortion in the tubular component material that becomes the side wall of the tubular body, it can be corrected. Therefore, it is possible to manufacture a mold for molding a sample with high dimensional stability while using an injection-molded product that is easily distorted.

By strongly tightening the outer peripheral portion of the bottom plate and the tubular body with the exterior film, it becomes possible to sufficiently bring the joined portions of the tubular constituent members into close contact with each other and to sufficiently bring the joined portions of the tubular body and the bottom plate into close contact with each other. Moreover, since the exterior film is in close contact with both joints and covers both joints, it is possible to effectively prevent water leakage from the joints, and no special measures such as applying grease to the joints are required. Also, it is possible to realize good water-tightness required for the mold for molding a specimen for concrete strength test defined by JIS. In addition, when taking out the cured specimen, the tubular body can be easily disassembled into pieces by simply tearing the thin exterior film with a cutter knife or the like, so that the specimen can be taken out easily. The outer film is preferably provided over the entire length of the tubular body in order to improve the dimensional stability of the tubular body due to tightening and to impart watertightness over the entire length of the tubular body.

Further, in this sample molding mold, a plurality of elongated tubular constituent members each having a partial arc-shaped cross section formed by dividing the tubular body in the circumferential direction, and a circular flat plate-like member fitted to the bottom of the tubular body. It is enough to mold the bottom plate, without requiring advanced molding technology,
Since it can be easily molded, it can be manufactured at low cost. Further, since the shape is simpler than that of the integrally molded one, the molding die can be manufactured at a low cost and the initial investment can be suppressed. Further, although the exterior film is disposable, the tubular component and the bottom plate can be repeatedly used, which makes the product environmentally friendly.

Here, a groove portion extending along the length direction may be formed in one of the joint portions of the adjacent tubular constituent members, and a protrusion portion fitted in the groove portion may be formed in the other. In this case, it is possible to prevent the fitting portion of the tubular constituent material from shifting and to maintain a stronger tubular shape. Moreover, if the groove and the protrusion are formed over the entire length of the tubular component, the sealing property at the joint between the tubular components can be improved. In particular, if the width of the protrusion is made slightly wider than the width of the groove, it is possible to further improve the sealing property at the joint.

An upper fitting groove into which the lower end of the cylinder is fitted may be formed on the outer peripheral portion on the upper surface side of the bottom plate. In this case,
When the outer circumference of the cylinder is tightened with the exterior film, the size of the bottom part is restricted by the bottom plate and the shape and size are stable, so that the standard size of the mold for molding a concrete strength test sample can be achieved well.

An inner circumference fitting groove into which the outer circumference of the bottom plate fits may be formed in the vicinity of the lower end of the tubular component. In this case, when the outer circumference of the cylinder is tightened with an exterior film, the size of the bottom of the form is restricted by the bottom plate, and the shape and size are stable. Can be realized satisfactorily. Moreover, since the bottom plate is fixed to the inner wall of the cylinder by the tightening force of the exterior film, the bottom plate will not be displaced or come off due to the weight of the contents even after the concrete is cast and the mold is lifted. Moreover, since the outer peripheral portion of the bottom plate is fitted in the inner peripheral fitting groove, the sealing performance at the joint between the cylindrical body and the bottom plate can be improved. In particular, if the width of the outer peripheral portion of the bottom plate is made slightly wider than the width of the inner peripheral fitting groove, it is possible to further improve the sealing property at the joint portion.

An outward flange portion may be formed on the upper end of the tubular component. Providing such a flange increases the strength of the rim of the cylinder, prevents deformation of the cylinder when the outer circumference of the cylinder is tightened with an exterior film, and stabilizes the dimension of the rim, It becomes possible to achieve the standard dimensions of the molding frame in good condition.

A cutting guide portion may be formed on the exterior film. As a cutting guide, for example, by putting a notch or perforation in the exterior film and tearing it easily by hand, there is no need to prepare a knife such as a cutter knife when taking out the specimen, and the exterior film Can be easily cut open to disassemble the forming mold. In addition, it is preferable to form the incision guide portion in a band shape in the length direction of the exterior film because the incision guide portion can be cut off by simply pinching and pulling the incision guide portion to easily open the exterior film. By doing this, when taking out the specimen, the molding frame can be disassembled without damaging the members forming the molding frame with a blade, and thus the members forming the molding frame can be reused. Is also suitable.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1 and FIG. 2, a concrete strength test specimen molding frame 1 is composed of a cylindrical body 3 which is circumferentially divided into a plurality of cylindrical constituent materials 2 which can be combined into a cylindrical shape, and a cylindrical body 3. A bottom plate 4 capable of closing an opening on the lower surface, and a plurality of cylinder constituent members 2 which are closely attached to the cylinder body 3 and are closely attached to each other.
They are provided with each other and the exterior film 5 made of a thermoplastic synthetic resin film that integrally joins the cylindrical body 3 and the bottom plate 4. Then, the tubular body 3 is formed by combining a plurality of tubular components 2, and the bottom plate 4 is assembled so as to close the lower surface opening of the tubular body 3, and the tubular shape of the exterior film 5 made of a thermoplastic synthetic resin film is attached thereto. Of the raw material film 5A, and the raw material film 5A is heat-shrinked by a heating means such as an electric heater or a hot gun, so that the outer packaging film 5 is closely fitted to the outer surface of the tubular body 3 to form a plurality of tubular components. The two bodies are integrally joined together, and the tubular body 3 and the bottom plate 4 are joined together.
And will be joined together.

For the cylinder component 2 and the bottom plate 4, various materials such as a metal material, a synthetic resin material, and water-proof cardboard can be used as long as they can be formed into desired shapes. Considering the ease of production, the handleability of the product, the cost, etc., it is preferable to manufacture it by injection molding using a polyolefin-based thermoplastic synthetic resin such as polypropylene as a material. Further, as shown in FIG. 2, since the tubular constituent materials 2 assembled facing each other are strongly tightened by the exterior film 5, shrinkage distortion of the injection molding occurs in the tubular constituent materials 2, and some warpage or deformation occurs. Even if a crack occurs, it can be corrected, and even if an injection-molded product that is easily distorted is used, it is possible to manufacture the concrete-molding test-piece-molding frame 1 for concrete strength test having high dimensional stability.

The tubular component 2 is formed in a semi-cylindrical shape in which the tubular body 3 is divided into two in the circumferential direction, and an outwardly extending flange portion 7 is integrally formed at the upper end portion thereof over the entire length in the circumferential direction. Has been formed. By providing such a flange portion 7, the rigidity of the upper end opening of the tubular component 2 is increased,
Preventing the deformation of the opening of the tubular body 3 when the tubular body 3 is tightened with the exterior film 5 to stabilize the size and shape,
It is possible to favorably realize the standard dimensions of the concrete-molding test-piece forming frame 1. The flange 7
In place of the above, a thick ring portion is formed at the upper end of the tubular component 2, or a bent portion having an L-shaped cross section that is bent outward is formed, and the upper end opening is provided at the upper end of the tubular body 3. You may form the reinforcement part which reinforces. In addition, if the tubular component 2 is made thick,
The flange portion 7 may be omitted if the upper end opening can be sufficiently secured in strength and rigidity, such as when it is made of a metal material.

As shown in FIGS. 2 and 3, a groove portion 10a is formed in the middle of the joint surface 10 of the two tubular components 2 in the width direction, and a groove portion 10a is formed over the entire length of the joint surface 10 and the joint surface 11 of the other joint surface 11 in the width direction. A protrusion 11a that fits into the groove 10a is formed along the entire length of the intermediate portion, and these two cylinder components 2 are formed by connecting the protrusion 11a of one cylinder component 2 to the groove 1 of the other cylinder component 2.
0a is fitted and assembled in a tubular shape. This groove 10
The a and the protrusion 11a connect the groove 10a and the protrusion 11a to the joint surfaces 10 and 1 as long as the both tubular components 2 are positioned.
Although it may be partially provided in the length direction of 1 instead of the entire length thereof, if it is provided over the entire length of the joint surfaces 10 and 11 as described above, the contact area between the two tubular components 2 is set to be large, It is preferable because the sealing property at the joint portion 12 can be improved. The width of the protrusion 11a may be set to be substantially the same as the width of the groove 10a, but if it is set slightly larger, the protrusion 1a
It is possible to improve the sealing performance at the joint 12 between the groove 1a and the groove 10a.

In this embodiment, the cylindrical body 3 is divided into two in the circumferential direction, but it may be divided into three or more. Further, both the tubular constituent materials 2 are preferably configured in the same shape in order to reduce the manufacturing cost, but they can be configured in different shapes.

As shown in FIGS. 4 and 5, an inner peripheral fitting groove 13 is formed on the inner peripheral surface near the lower end of the tubular component 2 so as to be annularly connected to each other when the tubular component 2 is assembled. Four
A lower fitting groove 14 is formed on the outer peripheral portion of the lower surface of the base plate 4, and an annular fitting protrusion 15 that fits into the inner peripheral fitting groove 13 is formed on the upper peripheral portion of the bottom plate 4. The portion 15 is fitted into the inner circumferential fitting groove 13 of the tubular body 3 and assembled to the tubular body 3. In this way, since the fitting projection 15 on the outer peripheral portion of the bottom plate 4 is fitted into the inner peripheral fitting groove 13 to assemble the bottom plate 4 into the cylindrical body 3, after the concrete is driven into the formwork 1. , Formwork 1
Even if the is lifted, the bottom plate 4 can be prevented from shifting or coming off due to the weight of the concrete.

The outer diameter of the fitting projection 15 and the diameter of the vertical surface 14a of the lower fitting groove 14 are set to be the same as the diameter of the inner end surface of the inner fitting groove 13 and the inner diameter of the tubular body 3, respectively. When the tubular component 2 is fastened with the exterior film 5, the fitting protrusion 15
The outer peripheral surface of the inner peripheral fitting groove 13 is pressed against the inner end surface of the inner peripheral fitting groove 13, and the vertical surface 14a of the lower fitting groove 14 is pressed against the inner surface of the cylindrical body 3 to join the cylindrical body 3 to the bottom plate 4. It is configured so that the sealing property in can be sufficiently secured. The width of the fitting protrusion 15 may be set to be substantially the same as the groove width of the inner circumference fitting groove 13, but if it is configured to be slightly wider, the sealing property at the joint portion 16 between the tubular body 3 and the bottom plate 4 can be improved. Therefore, it is preferable.

However, as in the case forming mold 1A shown in FIG. 6, a bottom plate 4A is provided in which the lower fitting groove 14 is omitted instead of the bottom plate 4, and the groove width is changed to the bottom plate in place of the tubular component 2. It is also possible to provide the tubular component 2A having the inner peripheral fitting groove 13A set to have the same thickness as that of No. 4, and to fit the outer peripheral portion of the bottom plate 4A directly into the inner peripheral fitting groove 13A. In this case, the outer diameter of the bottom plate 4A is set to be the same as the diameter of the inner end face of the inner peripheral fitting groove 13A. Further, as in the case forming mold 1B shown in FIG. 7, a bottom plate 4B having an upper fitting groove 14B formed on the outer peripheral portion on the upper surface side is used instead of the bottom plate 4, and the inner peripheral surface is replaced with the cylindrical component 2. Using the tubular component 2B in which the fitting groove 13 is omitted,
Fit the lower end of the tubular component 2B into the upper fitting groove 14B,
The bottom plate 4B may be fixed to the tubular component 2B. In this case, the diameter of the vertical surface 20 of the upper fitting groove 14B is set to the cylindrical component 2B.
, And the outer diameter of the bottom plate 4 is set to the outer diameter of the tubular component 2B. Further, a sample molding mold 1C shown in FIG.
As described above, instead of the bottom plate 4, a bottom plate 4C in which an upper fitting groove 14C is formed in the vicinity of the outer periphery on the upper surface side is used, and instead of the cylinder component 2, a cylindrical component 2C in which the inner peripheral fitting groove 13 is omitted is used. Alternatively, the bottom plate 4C may be fixed to the tubular component 2C by fitting the lower end of the tubular component 2C into the upper fitting groove 14C. Furthermore, the bottom plates 4 and 4B may be manufactured by concentrically stacking two disc-shaped members having different diameters and joining them with an adhesive or the like.

As the material of the exterior film 5, any material can be adopted as long as it can shrink by heating. For example, a thermoplastic synthetic resin material such as vinyl chloride, polystyrene, polypropylene or polyethylene retephthalate is formed into a tube shape and stretched, or a film made of these thermoplastic synthetic resin materials is stretched. It is possible to preferably employ a material obtained by laminating it in a tube shape. The material film 5A of the exterior film 5 is formed in a tubular shape having a diameter slightly larger than the outer diameter of the tubular body 3 and is configured to be slightly longer than the length of the tubular body 3. When the exterior of the assembly of the bottom plate 4 and the bottom plate 4, the raw material film 5A is mounted from the lower side of the tubular body 3 to the vicinity of the flange portion 7, and in this state, the raw material film 5A is heated by an electric heater or a hot gun. By heat-shrinking with, the assembly is closely attached to the exterior. In this state, the upper end portion of the exterior film 5 is arranged on the flange portion 7, and the lower end portion of the exterior film 5 is formed with an inner flange portion 8 extending inward from the lower end of the tubular body 3.

As described above, the exterior film 5 is the same as the cylindrical body 3.
And a bottom plate 4 and a container-shaped outer surface of the container-shaped outer surface, and a joint part 12 between the cylinder components 2 and a joint part 1 between the cylinder body 3 and the bottom plate 4.
In order to prevent water leakage from the container shape by sealing 6
To obtain good water-tightness required for concrete strength test specimen molding formwork 1 specified in JIS standard without special consideration such as coating the joints 12 and 16 with water leakage prevention grease. Is possible. Further, since the shape is maintained only by fixing with the thin film-like exterior film 5 as described above, the mold 1 can be easily disassembled by simply cutting the exterior film 5 with a cutter knife or the like, and thus the mold 1 is formed. It is possible to easily take out the specimen. Further, by providing the inner flange portion 8 at the lower end of the exterior film 5, the vicinity of the bottom plate 4 of the tubular body 3 can be sufficiently tightened, and the bottom plate 4 can be effectively prevented from falling off the tubular body 3.

As shown in FIGS. 1 and 2, the exterior film 5
Two parallel perforations 21 extending in the axial direction are formed in a part of the circumferential direction of the blade, and a band-shaped incision guide portion 22 is formed between the perforations 21. Even if not preparing, the incision guide portion 2 can be easily moved along the perforation 21 by simply pinching and pulling the end portion of the incision guide portion 22.
The exterior film 5 can be cut open by cutting out 2 and the concrete strength test specimen can be easily disassembled after the concrete strength test specimen is molded, and the concrete strength test specimen can be taken out. . Further, since the tubular component 2 and the bottom plate 4 are not damaged when the exterior film 5 is cut open, it is convenient for reusing these mold component members.

However, the incision guide portion 22 is used as the exterior film 5.
If it is configured so that it can be easily incised, it does not necessarily have to be formed in a strip shape, and for example, it is formed in a V shape at the upper edge of the exterior film 5 and the exterior film 5 can be incised from there. You may.

[0030]

EFFECT OF THE INVENTION According to the mold for molding a specimen for concrete strength test according to the present invention, after assembling a mold component member, this is covered with an exterior film made of a thermoplastic film, and the exterior film is heat-shrinked. Since the outer peripheral part of the mold frame component is strongly tightened to join the mold component members, even if there is some warp or distortion in the member forming the side wall part, this can be corrected, so distortion easily occurs but at a low cost. It is possible to realize a mold for molding a specimen with high dimensional stability while molding the mold constituent member by a moldable injection molding method. In addition, since it can be assembled by a simple method using an exterior film, it can be easily assembled, and the exterior film is disposable, but since the cylinder component and the bottom plate can be repeatedly used, it is possible to reduce environmental impact. It is possible to realize a gentle and economical mold for molding a specimen.

Further, since the outer surface of each formwork constituent member is strongly tightened and covered with the exterior film, the joint surface of each constituent member can be sealed in a watertight manner, and grease or oil soil can be applied to the joint surface. Even if no special consideration is given, it is possible to satisfactorily meet the water leakage standard of the concrete molding test formwork required by the JIS standard. In addition, the shape is maintained by shrinking the exterior film and tightening it from the outer periphery, so the entire sample can be easily disassembled into pieces by simply cutting the thin exterior film with a cutter knife, etc. Therefore, it is possible to realize a mold for molding a specimen with high performance and high convenience.

Here, if a groove extending along the length direction is formed in one of the joints of the adjacent tubular constituents and a protrusion that fits into the groove is formed in the other, a fitting portion of the tubular constituents is formed. It is possible to prevent displacement and maintain a stronger cylindrical shape. Further, if the width of the protrusion is formed to be slightly larger than the width of the groove, the watertightness of the joint can be further ensured, so that it is possible to more effectively prevent water leakage of the mold for molding the specimen. Becomes Further, since each constituent member can be divided into a simple shape, a molding die can be manufactured at low cost and initial investment can be suppressed.

If an upper fitting groove into which the lower end of the tubular body is fitted is formed in the outer peripheral portion on the upper surface side of the bottom plate, the dimensions of the bottom portion are restricted by the bottom plate when the outer periphery of the tubular body is tightened by the outer film, and the shape and dimensions are determined. Is stable, the bottom plate regulates the shape and size of the bottom of the cylinder, and it is possible to manufacture a mold for molding a specimen with higher strength and dimensional stability.

When the inner peripheral fitting groove in which the outer peripheral portion of the bottom plate is fitted is formed in the vicinity of the lower end of the tubular component material, the size of the bottom portion is restricted by the bottom plate when the outer periphery of the tubular body is tightened with the exterior film, and the shape of the shape is changed. Since the dimensions are stable, the standard dimensions of the mold for molding the specimen can be well realized. Moreover, the bottom plate is firmly fixed to the groove of the inner wall portion of the tubular component, and even if the mold is lifted while concrete is being poured, the bottom plate will not be displaced or come off due to its weight. Further, at this time, by forming the width of the outer peripheral portion of the bottom plate to be slightly larger than the groove width of the inner peripheral fitting groove, the watertightness of the joint portion between the cylindrical body and the bottom plate, as in the joint portion between the tubular constituent members. Since it is possible to further ensure the reliability, it is possible to more effectively prevent water leakage of the molding frame.

When the outward flange is formed at the upper end of the tubular component, the strength of the rim portion of the tubular body is increased, and the tubular body is prevented from being deformed when the outer periphery of the tubular body is fastened with an exterior film to prevent the tubular body from deforming. It is possible to manufacture a sample forming mold that stabilizes the size of the edge portion and is more resistant to deformation and has high dimensional stability.

When the incision guide portion is formed on the exterior film,
It is possible to easily disassemble the mold for concrete strength test specimen molding and take out the molded specimen. Further, by doing so, the constituent members of the sample-molding frame can be disassembled and collected without damaging them, and can be reused as a sample-molding frame by simply reassembling and fixing with an exterior film.

[Brief description of drawings]

FIG. 1 is a perspective view of a mold for molding a specimen.

FIG. 2 is an exploded perspective view of a mold for molding a specimen.

3 is a sectional view taken along line III-III of FIG.

FIG. 4 is a vertical cross-sectional view of the bottom of the mold for molding a specimen.

FIG. 5 is a sectional view of an essential part of a mold for molding a specimen.

FIG. 6 is a view corresponding to FIG. 5 of a sample forming mold having another configuration.

FIG. 7 is a view corresponding to FIG. 5 of a sample forming mold having another configuration.

FIG. 8 is a view corresponding to FIG. 5 of a sample forming mold having another configuration.

[Explanation of symbols]

1 Specimen formwork for concrete strength test 2 Cylinder component 3 Cylinder 4 Bottom plate 5 Exterior film 5A Material film 7 Flange 8 Inner collar part 10 Bonding surface 10a Groove 11 Joining surface 11a Projection 12 Joint 13 Inner peripheral fitting groove 14 Lower fitting groove 14a Vertical surface 15 Fitting protrusion 16 Joint 20 Vertical 21 Perforation 22 Incision guide 1A Mold for molding test specimens 2A Cylinder components 4A Bottom plate 13A Inner peripheral fitting groove 1B Mold for molding test specimen 2B Cylinder component 4B Bottom plate 14B Upper fitting groove 1C Mold for molding specimen 2C Cylinder component 4C Bottom plate 14C Upper fitting groove

Claims (6)

[Claims] 1. A tubular body divided circumferentially into a plurality of tubular components that can be combined into a tubular shape, a bottom plate capable of closing an opening of a lower surface of the tubular body, and an exterior body closely attached to the tubular body. A mold for molding a test specimen for concrete strength test, comprising: a plurality of tubular components, and an exterior film made of a thermoplastic synthetic resin film that integrally joins the tubular body and the bottom plate. 2. A concrete strength test for a concrete strength test according to claim 1, wherein a groove extending along the length direction is formed on one of the joints of the adjacent tubular constituent materials, and a protrusion fitting to the groove is formed on the other. Formwork for molding specimens. 3. The mold for molding a specimen for concrete strength test according to claim 1 or 2, wherein an upper fitting groove into which a lower end of the cylinder is fitted is formed on an outer peripheral portion on an upper surface side of the bottom plate. 4. The mold for molding a specimen for concrete strength test according to claim 1 or 2, wherein an inner peripheral fitting groove into which an outer peripheral portion of the bottom plate fits is formed in the vicinity of a lower end of the tubular component material. 5. The mold for molding a concrete strength test specimen according to claim 1, wherein an outward flange portion is formed on an upper end portion of the tubular component. 6. The mold for molding a specimen for concrete strength test according to claim 1, wherein a cutting guide portion is formed on the exterior film.