Specimen formwork and specimen manufacturing method

Abstract

To provide a satisfactory test piece.SOLUTION: A test piece flask comprises: a cylindrical body cylindrically formed by a synthetic resin; a bottom plate provided so as to clog either opening of the cylindrical body and tubularly formed by a synthetic resin; a planar reinforcing material provided in an upright state against the outside planar face in the planar faces of the bottom plate; and an upland provided in the lengthwise direction of the cylindrical body along the outer edge of the bottom plate. The reinforcing material is provided in a state of having a length in the central direction from the outer edge of the bottom plate, is connected with the inner wall face of the upland, and also has a height almost same as that of the upland. In this way, the expansion deformation in the plate thickness direction of the bottom plate can be prevented.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a specimen formwork and a method for manufacturing a specimen. [Background technology]

[0002] For example, Patent Document 1 discloses a formwork for a concrete specimen made of synthetic resin and provided with a tab 15 for tearing. Furthermore, Patent Document 2 discloses a plastic concrete strength test specimen forming formwork having a tongue piece 13a attached to the upper cylindrical opening edge. Furthermore, Patent Document 3 discloses a formwork for forming a concrete specimen that includes a cylindrical portion that is divided into two parts in the vertical direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-190225 [Patent Document 2] Patent No. 3198038 [Patent Document 3] Japanese Patent Application Laid-Open No. 2004-144486 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a good specimen. [Means for solving the problem]

[0005] The specimen formwork of the present invention comprises a cylindrical body formed in a cylindrical shape from synthetic resin, a bottom plate formed in a plate shape from synthetic resin and arranged to cover one opening of the cylindrical body, and a plate-shaped reinforcing material arranged upright against the outer plate surface of the bottom plate.

[0006] Preferably, the reinforcing member is provided with a length extending from the outer edge of the bottom plate toward the center.

[0007] Preferably, the cylindrical body further has a pedestal arranged along the outer edge of the bottom plate in the longitudinal direction thereof, and the reinforcing material is connected to the inner wall surface of the pedestal and is approximately the same height as the pedestal.

[0008] Preferably, the bottom plate further comprises a bottom groove provided on the same surface of the bottom plate as the surface on which the reinforcing material is provided, a side wall groove formed on the outer wall surface of the cylindrical body and continuing from one end where the bottom plate is provided to the other opening end, and a protrusion provided on the same surface of the bottom plate as the surface on which the reinforcing material is provided, wherein the reinforcing material and the protrusion are located within an area surrounded by the bottom groove, the bottom groove and the side wall groove are formed to be connected and continuous with each other, and the thickness of the bottom plate at the position where the bottom groove is provided and the thickness of the cylindrical body at the position where the side wall groove is provided are formed to a thickness that can be torn apart by action on the protrusion.

[0009] Preferably, the thickness of the bottom plate at the position where the bottom groove is provided is thinner than the thickness of the cylindrical body at the position where the side wall groove is provided.

[0010] Preferably, the thickness of the bottom plate at the position where the bottom groove is provided is formed so as to gradually increase from the center of the bottom plate toward the outer edge.

[0011] Preferably, the container further comprises a reinforcing member disposed at a position where the cylindrical body or the bottom plate will expand and deform when filled with raw material for the specimen.

[0012] In addition, the test specimen manufacturing method according to the present invention includes the steps of filling raw materials for a test specimen formwork having a cylindrical body formed in a cylindrical shape from synthetic resin, a bottom plate formed in a plate shape from synthetic resin and arranged to cover one opening of the cylindrical body, and a plate-shaped reinforcing material arranged upright on the outer surface of the bottom plate, after the filled raw materials have hardened, applying force to the protrusion to split the test specimen formwork from the bottom plate, and removing the test specimen from the split test specimen formwork. [Effects of the Invention]

[0013] According to the present invention, a good specimen can be provided. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 2 is a perspective view of the specimen formwork 1 in this embodiment as viewed from the bottom plate side. [Figure 2] FIG. 2 is a perspective view of the specimen formwork 1 in this embodiment as viewed from the opening side. [Figure 3] 1A and 1B are a front view, a rear view, a right side view, and a left side view of a specimen formwork 1 in this embodiment. [Figure 4] 1A to 1C are a plan view, a bottom view, and a cross-sectional view of a specimen formwork 1 in this embodiment. [Figure 5] 1 is a diagram for explaining in detail the side grooves 12 and bottom grooves 24 of the specimen formwork 1. FIG. [Figure 6] 1 is a diagram illustrating a specimen formwork 1 filled with raw material for a specimen. [Figure 7] FIG. 2 is a diagram illustrating the specimen formwork 1 in a disassembled state. [Figure 8] 10A and 10B are diagrams illustrating a manufacturing method of specimen C. [Figure 9] 1 is a diagram illustrating a first modified example of the specimen formwork 1 of the embodiment. [Figure 10] 10 is a diagram illustrating a second modified example of the specimen formwork 1 of the embodiment. FIG. [Figure 11] 10 is a diagram illustrating a second modified example of the specimen formwork 1 of the embodiment. FIG. [Figure 12] 10 is a diagram illustrating a third modified example of the specimen formwork 1 of the embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the scope of the present invention is not limited to the illustrated examples. FIG. 1 is a perspective view of a specimen formwork 1 in this embodiment as viewed from the bottom plate side. FIG. 2 is a perspective view of the specimen formwork 1 in this embodiment as viewed from the opening side. FIG. 3 is a front view, a rear view, a right side view, and a left side view of the specimen formwork 1 in this embodiment. FIG. 4 is a plan view, a bottom view, and a cross-sectional view of the specimen formwork 1 in this embodiment. 1 to 4, the specimen formwork 1 has a cylindrical body 10, a bottom plate 20, and a platform 30. The cylindrical body 10, the bottom plate 20, and the platform 30 are injection molded from a transparent or semi-transparent synthetic resin, and the above components are integrally formed. The cylindrical body 10 is made of synthetic resin and has a cylindrical shape with a diameter of 5 cm and a height of 12 cm. The cylindrical body 10 also includes a side groove 12, an auxiliary protrusion 14, and a flange 17.

[0016] The side grooves 12 are grooves formed on the outer wall surface of the cylindrical body 10, and are continuously formed from one end where the bottom plate 20 is provided to the other open end. In this example, the side grooves 12 are formed in two lines in the vertical direction of the cylindrical body 10, connecting both ends of the cylindrical body 10 in a straight line, and are continuous with the two bottom grooves 24 formed in the bottom plate 20 at one end where the bottom plate 20 is provided. The thickness of the cylindrical body 10 at the position where the side wall grooves 12 are provided is formed to a thickness that will tear when acted upon, for example, by the protrusion 22. Specifically, the depth of the side grooves 12 is such that they will tear when pulled by human force. As a result, the area sandwiched between the side grooves 12 (hereinafter referred to as area 50) is separated from the cylindrical body 10. The side wall grooves 12 are also formed to be connected to the bottom grooves 24. The region 50 that is torn open from the cylindrical body 10 by manual pulling is integrated with the auxiliary protrusion 14 described below and a region 51 surrounded by the bottom groove 24.

[0017] The auxiliary protrusion 14 is a protrusion formed at the open end of the cylindrical body 10 and is connected to the region sandwiched between the side grooves 12 . The flange 17 is a collar formed at the open end of the cylindrical body 10. The flange surface of the flange 17 is formed to be smooth.

[0018] The bottom plate 20 is a plate-shaped material made of synthetic resin, and closes one opening of the cylindrical body 10. In this example, the bottom plate 20 has a thin, disk-like shape. The bottom plate 20 also includes a protrusion 22, a bottom groove 24, and a reinforcing plate 26.

[0019] The protrusion 22 is a protrusion that protrudes from the same surface of the bottom plate 20 as the surface on which the reinforcing member 26 is provided. In other words, the protrusion 22 is a protrusion that protrudes from the outer surface of the bottom plate 20. For example, the protrusion 22 is a cylinder with a height of 1.0 mm to 3.0 mm, but is not limited to this and may be of any size and shape that can be pinched with pliers or the like. The protrusion 22 in this example is a cylinder that protrudes outward from the center of the circular bottom plate 20. The protrusion 22 is located within the area surrounded by the bottom groove 24.

[0020] The bottom groove 24 is a groove formed on the same surface of the bottom plate 20 as the surface on which the reinforcing member 26 is provided. The bottom groove 24 is a groove formed on the wall surface on the outside of the bottom plate 20 (i.e., located on the outside of the cylindrical body 10). The bottom groove 24 in this example is formed to surround the protrusion 22 and the reinforcing member 26, and is continuous with the two side grooves 12 at the outer edge of the bottom plate 20. From here, two grooves extend at equal intervals toward the center of the bottom plate 20, and draw arcs from both sides of the protrusion 22 with the protrusion 22 as the center. Furthermore, the thickness of the bottom plate 20 at the position where the bottom groove 24 is provided is formed to a thickness that allows it to tear open when acted upon by the protrusion 22, for example. Specifically, the depth of the bottom groove 24 is such that it will tear open when pulled by human force. As a result, the area sandwiched between the bottom grooves 24 (hereinafter, area 51) is separated from the bottom plate 20. Note that area 51, which tears open from the bottom plate 20 when pulled by human force, is integrated with the auxiliary protrusion 14 and area 50.

[0021] The reinforcing plate 26 is a plate-like protrusion that is provided upright on the outer surface of the bottom plate 20. The reinforcing plate 26 is provided with a length extending from the outer edge of the bottom plate 10 toward the center. In this example, the reinforcing plate 26 is a plate material with a height of 1.0 mm to 3.0 mm, and is provided with its longitudinal direction extending from the outer edge of the bottom plate 10 toward the protrusion 22 located at the center of the bottom plate 10. The height (length in the short direction) of the reinforcing plate 26 is such that the end face of the reinforcing plate 26 and the end face of the pedestal 30 are substantially the same height. "Substantially the same height" means that the end face of the reinforcing plate 26 and the end face of the pedestal 30 are substantially aligned. Note that "substantially the same height" also includes a height where there is a slight step between the end face of the reinforcing plate 26 and the end face of the pedestal 30, as long as deformation of the bottom plate 10 is within an allowable range. The reinforcing plate 26 includes a reinforcing plate connected to the inner wall surface of the plateau 30 (described later) and a reinforcing plate located within the region 51 .

[0022] The plateau 30 is a platform provided along the outer edge of the bottom plate 20 in the longitudinal direction of the cylindrical body 10. The plateau 30 protrudes to the same height as the protrusion 22 or higher than the protrusion 22, and is provided excluding the region 51. The portion of the plateau 30 excluding the region 51 is referred to as the cutout portion 28.

[0023] FIG. 5 is a diagram illustrating the side grooves 12 and the bottom grooves 24 of the specimen formwork 1 in detail. As shown in FIG. 5, the thickness t of the bottom plate 20 at the position where the bottom grooves 24 are provided is, for example, 0.3 mm to 0.4 mm, and in this example, 0.35 mm, at the position of the bottom groove 24a (the bottom groove 24 in the arc-shaped portion). The thickness t of the bottom plate 20 at the position of the bottom groove 24b (the bottom groove 24 in the double-stripe portion at the outer edge of the bottom plate 20) is, for example, 0.6 mm to 0.7 mm, and in this example, 0.65 mm. The thickness of the bottom plate 20 at the position where the bottom grooves 24 are provided in this example is gradually increased from the center of the bottom plate 20 toward the outer edge. Therefore, the thickness gradually increases from 0.35 mm to 0.65 mm from the center toward the outer edge. This makes it easier to tear. The thickness t of the cylindrical body 10 at the position where the side groove 12 is provided is uniform, for example, 0.6 mm to 1.2 mm, and in this example, 1.1 mm. Note that the thickness of the cylindrical body 10 at the position where the side groove 12 is provided may be formed so as to gradually increase from one end of the cylindrical body 10 where the bottom plate 20 is provided toward the open end. In this way, the thickness t of the bottom plate 20 at the position where the bottom surface groove 24 is provided is formed thinner than the thickness t of the cylindrical body 10 at the position where the side wall groove 12 is provided.

[0024] FIG. 6 is a diagram illustrating the specimen formwork 1 filled with the raw material of the specimen. FIG. 6(A) is a diagram illustrating a specimen formwork 1 having a reinforcing plate 26, and FIG. 6(B) is a diagram illustrating a specimen formwork 1 without a reinforcing plate 26. As shown in FIG. As shown in Fig. 6(A), when a relatively heavy raw material is filled into the specimen formwork 1 to the extent that it deforms, the bottom plate 20 of the specimen formwork 1 deforms. On the other hand, as shown in Fig. 6(B), the reinforcing plate 26 is located between the bottom plate 20 and the installation surface of the specimen formwork 1, so the bottom plate 20 does not deform. In this way, the specimen formwork 1 of this example can prevent deformation of the bottom plate 20 even when relatively heavy raw materials are filled to the extent that the specimen formwork 1 deforms, and a good specimen can be produced.

[0025] FIG. 7 is a diagram illustrating the specimen formwork 1 in an exploded state. As illustrated in Figure 7, in this example, by pulling the protrusion 22 or the auxiliary protrusion 14, the areas surrounded by the side groove 12 and the bottom groove 24 illustrated in Figure 1, i.e., areas 50 and 51, come off the specimen formwork 1, and the specimen formwork 1 can be opened wide.

[0026] FIG. 8 is a diagram illustrating a method for manufacturing a test piece. As shown in FIG. 8(A), a worker first fills the cylindrical interior of the specimen formwork 1 with raw materials for the specimen (for example, concrete, mortar, etc.). Because the specimen formwork 1 is made of a translucent resin, the state of the raw materials inside the specimen formwork 1 can be visually confirmed. Furthermore, the specimen formwork 1 can prevent expansion and deformation in the thickness direction of the bottom plate 20 by using a reinforcing plate 26. In this example, the specimen formwork 1 is filled to capacity with raw materials for convenience, but the present invention is not limited to this. Next, as illustrated in Figure 8(B), after the filled raw material of the test piece has hardened, the worker pulls the protrusion 22, cleaving the bottom groove 24 and the side groove 12 in that order, and removes the areas 50 and 51. As illustrated in Figure 8(C), after removing the areas 50 and 51 surrounded by the grooves (side groove 12 and bottom groove 24) from the specimen formwork 1, the worker opens the specimen formwork 1 and demolds the specimen C that has hardened within the specimen formwork 1, thereby obtaining the specimen C.

[0027] As described above, the specimen formwork 1 of this embodiment can prevent expansion and deformation of the bottom plate 20 in the plate thickness direction, making it possible to manufacture a cylindrical specimen with a smooth bottom surface. Furthermore, the specimen formwork 1 has grooves formed only on the outer surface, while the inner surface is smooth, making it possible to manufacture a specimen with a smooth surface. Furthermore, because the specimen formwork 1 of this example is integrally molded from a transparent or translucent resin, raw materials can be filled into the specimen formwork 1 while visually checking the state of the raw materials, which allows the raw materials to be filled while reducing air bubbles. Furthermore, by splitting the specimen formwork 1 of this example from the bottom side, a specimen with little damage can be obtained, which is particularly suitable for producing a specimen with a relatively low hardness. In addition, since the specimen formwork 1 of this example is integrally molded from resin, there is no need to separate it when disposing of it. Furthermore, multiple specimen formworks 1 to be disposed of can be collected together, making it possible to reduce the volume of waste.

[0028] Next, a modified example of the above embodiment will be described. In the modified example, elements having substantially the same functions and configurations as those in the above example will be assigned the same reference numerals and redundant description will be omitted. [Variation 1] FIG. 9 is a diagram illustrating a first modified example of the specimen formwork 1 of the embodiment. In the case of a relatively large specimen formwork 10, ribs 19 may be provided on the outer surface of the cylindrical body 10, as shown in FIG. 9. For example, the ribs 19 are integrally molded from resin, like the other components. In this example, the ribs 19 are in the shape of a long, thin quadrangular prism extending from the upper end to the lower end of the specimen formwork 1 (from the position of the flange 17 to the tip of the pedestal 30). The shape of the ribs 19 may be a triangular prism, a cylinder, a semi-cylinder, or the like. Such ribs 19 can suppress deformation of the specimen formwork 1, and are therefore suitable for a cylindrical body 10 having a diameter of 10 cm and a height of 22 cm, for example.

[0029] [Variation 2] FIG. 10 is a diagram illustrating a second modified example of the specimen formwork 1 of the embodiment. FIG. 11 is a diagram illustrating a second modified example of the specimen formwork 1 of the embodiment. As shown in FIGS. 10 and 11, the specimen formwork 1 of this example may have a configuration in which a reinforcing member 60 is attached to the outer side surface of the cylindrical body 10. The specimen formwork 1 of this example has a configuration that makes it easier to tear the regions 50 and 51 from the cylindrical body 10 illustrated in FIG. 1 by hand. In this example, to make it easier to tear the regions 50 and 51 from the cylindrical body 10, the thickness t of the cylindrical body 10 at the location of the side groove 12 is made as thin as possible, for example, a uniform thickness of 0.5 mm or less. Therefore, when the raw material of the specimen is filled, the thickness of the side wall surface of the cylindrical body 10 at the location of the side groove 12 is such that it expands and deforms in the thickness direction. Therefore, in this example, a reinforcing member 60 is attached to the outer side surface of the cylindrical body 10, thereby achieving both ease of tearing by hand and prevention of expansion and deformation of the cylindrical body 10. The details of this configuration are described below.

[0030] The reinforcing member 60 is a detachable sheet material that can be torn by hand. The reinforcing member 60 includes a support made of paper, cloth, or synthetic resin, and an adhesive layer laminated on the support. The reinforcing member 60 of this example includes a synthetic resin support formed by alternating warp and weft threads, and is less likely to stretch in the warp and weft directions. Because the reinforcing member 60 is woven with alternating warp and weft threads, it can be torn by hand along the weave. The reinforcing member 60 may also be a knitted sheet material (including a mesh material) as long as it is a sheet material that can be torn by hand. The reinforcing member 60 may also be transparent or translucent to the extent that the interior of the tubular body 10 can be seen. The width of the reinforcing member 60 is, for example, 25 mm or more and 100 mm or less, and the width of the reinforcing member 60 in the present example illustrated in Figures 10 and 11 is 50 mm. The thickness of the reinforcing member 60 is a thickness that allows it to be torn by hand and that makes it less likely to stretch or contract than the cylindrical body 10 when placed on the wall surface of the cylindrical body 10, for example, 0.1 mm or more and 0.5 mm or less. Preferably, the thickness of the reinforcing member 60 is 0.1 mm or more and 0.3 mm or less, and in this example, it is 0.13 mm. The reinforcing member 60 is positioned at a position where the cylindrical body 10 will expand and deform when filled with the raw material of the test specimen. The reinforcing member 60 illustrated in FIG. 10 is positioned in the longitudinal direction of the cylindrical body 10. The reinforcing member 60 is positioned at a position including the side groove 12 and the region 50. When the raw material of the test specimen is filled into the cylindrical body 10, the side groove 12 is thinner than the other side surfaces, so the reinforcing member 60 expands and deforms in the thickness direction of the cylindrical body 10. Therefore, it is preferable to position the reinforcing member 60 at a position including the side groove 12 and the region 50. Alternatively, the reinforcing member 60 may be positioned on the entire outer surface of the cylindrical body 10 as long as it includes the side groove 12 and the region 50. In this way, by positioning the reinforcing member 60 at a position including the side groove 12 and the region 50 of the cylindrical body 10, a good test specimen can be obtained even if the thickness t of the cylindrical body 10 at the position where the side groove 12 is provided is uniform throughout the entire vertical direction of the cylindrical body 10.

[0031] 11 is arranged around the cylindrical body 10 in the circumferential direction. The reinforcing member 60 is arranged, for example, in the vertical direction (material axis direction) of the cylindrical body 10 so as to include a position 1 / 3 from the bottom plate 20 side, in other words, a position 2 / 3 from the flange 17 side. When the cylindrical body 10 is filled with the raw material of the test specimen, a load is applied to the position 1 / 3 from the bottom plate 20 side, and the cylindrical body 10 expands and deforms in the plate thickness direction of the cylindrical body 10. For this reason, it is preferable to arrange the reinforcing member 60 at a position 1 / 3 from the bottom plate 20 of the cylindrical body 10. In this way, even if the raw materials of the test specimen are filled into a test specimen formwork 1 in which a reinforcing member 60 is arranged on the wall surface of the cylindrical body 10, the reinforcing member 60 can suppress expansion deformation of the cylindrical body 10 in the thickness direction. Furthermore, since the reinforcing member 60 can be torn by hand along the weave, after the raw material of the filled specimen has hardened, the protrusion 22 can be pulled to tear open the bottom groove 24 and then the side groove 12, and the reinforcing member 60 can be torn as regions 50 and 51 are removed from the cylindrical body 10, eliminating the need to separately peel the reinforcing member 60 from the cylindrical body 10.

[0032] [Variation 3] FIG. 12 is a diagram illustrating a third modified example of the specimen formwork 1 of the embodiment. As shown in FIG. 12, the specimen formwork 1 of this example may have a configuration in which a reinforcing member 62 is disposed on the bottom plate 20 of the cylindrical body 10. The reinforcing member 62 is a plate material formed of metal and having at least one smooth surface. The reinforcing member 62 may be a flat plate material whose main component is, for example, stainless steel, aluminum, iron, or steel, or may be one in which the surface of such a flat plate material is plated. Note that the reinforcing member 62 in this example is a bonded steel plate that has been surface-treated with zinc plating, and is a flat plate material with smooth surfaces on both sides. The shape of the reinforcing member 62 is the same as the inner diameter of the cylindrical body 10, and the reinforcing member 62 in this example has a circular shape that is the same as the inner diameter shape of the cylindrical body 10. The size of the reinforcing member 62 is large enough to cover a portion of the bottom plate 20 of the cylindrical body 10, and the reinforcing member 62 in this example is approximately the same as the inner diameter of the cylindrical body 10 (including a size slightly smaller than the inner diameter of the cylindrical body 10). Furthermore, the thickness of the reinforcing member 62 is such that it does not deform in the thickness direction even when the raw materials of the specimen are filled into the specimen formwork 1, for example, a thickness of 0.3 mm or more and 1.5 mm or less, and the thickness of the reinforcing member 62 in this example is 1 mm. The reinforcing member 62 is placed on the bottom plate 20 inside the cylindrical body 10 before the raw materials of the specimen are filled into the specimen formwork 1. The placed reinforcing member 62 is placed at a position where the bottom plate 20 will expand and deform, in this example, so as to cover the entire bottom plate 20. In this way, even when the raw materials of the specimen are filled into the specimen formwork 1 with the reinforcing member 62 arranged on the bottom plate 20, the reinforcing member 62 can suppress expansion deformation of the bottom plate 20 in the thickness direction. [Explanation of symbols]

[0033] 1. Test specimen formwork 10 Cylindrical body 12 Side groove 14 Auxiliary projection 17 Flange 20 Bottom plate 22 Protrusion 24 Bottom groove 26 Reinforcement plate 30 High ground 50 Area sandwiched between side grooves 12 51 Area sandwiched between bottom grooves 24 60, 62 Reinforcing member

Claims

1. a cylindrical body formed in a cylindrical shape from synthetic resin; a bottom plate formed of a synthetic resin in a plate shape and provided to close one opening of the cylindrical body; A plate-shaped reinforcing material provided upright on the outer plate surface of the bottom plate; and The reinforcing member is provided with a length extending from the outer edge of the bottom plate toward the center thereof, A pedestal provided along the outer edge of the bottom plate in the longitudinal direction of the cylindrical body and the reinforcing member is connected to the inner wall surface of the platform and has a height substantially equal to that of the platform; a bottom groove provided on the same surface of the bottom plate as the surface on which the reinforcing material is provided; a sidewall groove formed on the outer wall surface of the cylindrical body and continuing from one end where the bottom plate is provided to the other open end; a protrusion provided on the same surface of the bottom plate as the surface on which the reinforcing material is provided; and the reinforcing member and the protrusion are located within an area surrounded by the bottom groove; the bottom groove and the sidewall groove are formed to be connected to each other and continuous with each other, The thickness of the bottom plate at the position where the bottom groove is provided and the thickness of the cylindrical body at the position where the side wall groove is provided are formed to a thickness that allows the cylindrical body to be torn apart by action on the protrusion. Specimen formwork.

2. The thickness of the bottom plate at the position where the bottom groove is provided is equal to the thickness of the cylindrical body at the position where the side wall groove is provided. It is formed thinner than the thickness 2. The specimen formwork of claim 1.

3. In the thickness of the bottom plate at the position where the bottom groove is provided, from the center of the bottom plate toward the outer edge It is formed so that it gradually becomes thicker as it goes 3. A specimen formwork according to claim 2.

4. When the raw material of the specimen is filled, the cylindrical body or the bottom plate is arranged at a position where it will expand and deform. Reinforcement members Further having 2. The specimen formwork of claim 1.

5. a step of filling raw materials of a specimen into a specimen formwork having a cylindrical body made of synthetic resin, a bottom plate made of synthetic resin and formed in a plate shape so as to close one opening of the cylindrical body, a plate-like reinforcing member provided upright on an outer plate surface of the bottom plate, and a protrusion provided on the same surface of the bottom plate as the surface on which the reinforcing member is provided; After the filled raw material has hardened, applying force to the protrusion to tear the specimen form from the bottom plate; A step of removing the specimen from the cleaved specimen form. A method for manufacturing a specimen, including:

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