JPH0783811A - Sample molding form for concrete strength test - Google Patents

Abstract

PURPOSE:To easily and precisely assemble a metal bottom plate in a watertight state into one opening of a form constituted by plastic molding. CONSTITUTION:A metal bottom plate 20 is assembled into a plastic cylindrical body 10 so as to make contact with the collar 10a of the cylindrical body 10. The whole body or a part of the contact surface between the cylindrical body 10 and the bottom plate 20 is watertightly fixed by means of welding or bonding.

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 When a molding frame of a specimen for concrete strength test is formed by molding a plastic material, the frame can be made lighter than a case of using a metal material. There is an advantage that deformation does not easily occur even if the formwork is hit because the concrete is packed in the formwork without a gap.

However, in order to satisfy the flatness of the bottom surface of the specimen required by the JIS standard, the bottom plate of the mold must be smooth to some extent. However, in plastic molding, factors such as shrinkage distortion after molding are caused. Therefore, it is difficult to increase the smoothness of the bottom plate. From this point of view, a method is used in which the cylindrical body forming the mold is formed by plastic molding, while the bottom plate that closes one opening of the cylindrical body is made of metal to form the mold.

For example, in Japanese Utility Model Laid-Open No. 64-25743, a bottom plate receiving portion projecting inward is provided at a lower end of a cylindrical body forming the form frame, and the bottom plate receiving portion receives the bottom plate to form a form frame. The method to do is shown.

Further, a method for forming a plastic mold of the mold by providing a disc-shaped metal bottom plate as an insert so as to close one opening of a cylindrical body constituting the mold and a method of plastic molding the mold have been proposed by the present applicant. It was previously disclosed (Japanese Patent Application No. 5-1720).
75).

[0006]

However, in the mold of Japanese Utility Model Laid-Open No. 64-25743, the bottom plate is formed so that it can be easily taken out by pushing the bottom plate. Since the structure is such that it can be slidably fitted into the constituting cylindrical body, the sealing performance between the bottom plate and the cylindrical body is low, and therefore, the leakage of water or the like from the contact edge between the bottom plate and the cylindrical body. Since the inconvenience that causes the occurrence cannot be completely removed structurally, it was difficult to sufficiently satisfy the requirements of the JIS standard (JIS standard number A1132-4.
See 2.2).

On the other hand, when the metal bottom plate is a cylindrical insert, there is no structural inconvenience such as water leakage, but the bottom plate is inserted when the molded plastic is cured. One of the opening edges of the tubular body is regulated by the presence of the bottom plate so as to prevent the tubular body from contracting in the diametrical direction. However, since there is no such regulation at other portions, depending on whether or not this contraction is regulated. Distortion may occur between the opening edge portion of the tubular body into which the bottom plate is inserted and other portions. Such distortion is unlikely to occur in a mold having a relatively small diameter for producing a small-sized specimen, but is likely to occur in a mold having a relatively large diameter because the shrinkage amount also becomes large, and a mold having a large diameter is molded. This required special consideration in molding.

On the other hand, it is also possible to mold a bottomed cylindrical body by plastic molding, and then insert a metal bottom plate into the cylindrical body so as to be placed on the bottom to mold the mold. However, in this case, the bottom surface may be deformed so as to bulge inward or outward of the cylindrical body due to contraction after molding, and this deformation is more remarkable as the mold has a larger diameter. When the bottom surface is deformed in this way, the metal bottom plate to be inserted may be placed on the bottom surface with the plate surface inclined with respect to the cylinder axis of the cylindrical body. In this case, the specimen produced in such a case causes a problem that the one end surface of the specimen is formed in a state of being inclined with respect to the axis of the specimen. Such a situation also fails to meet the requirement of the JIS standard that the axis of the side plate (cylindrical) of the form and the bottom plate are at right angles (JIS standard number A1132-4.2.3).

Therefore, the present invention provides a mold which is lightweight, easy to handle and safe, and which is formed by plastic molding so as not to be deformed even if the mold is hit in order to stuff concrete into the mold without leaving a gap. While maintaining the advantages, a metal bottom plate that enhances the flatness of the bottom surface of the mold can be easily and accurately attached to the mold while sufficiently preventing leakage of concrete, water, etc., that has been driven into the mold. An object of the present invention is to provide a mold for molding a specimen for a concrete strength test, which has a structure that can be assembled on the bottom surface of the frame.

[0010]

In order to achieve the above object, in the invention according to claim 1, a mold for molding a test specimen for concrete strength test is provided with an inward facing collar 10 at one opening edge.
a tubular body 10 made of a plastic provided with a and the tubular body 1 so as to come into contact with the brim 10a of the tubular body 10 formed.
A metal mold having a disk-shaped metal bottom plate 20 which is inserted into the cylinder body 0 to close one opening of the cylinder body 10, wherein the cylinder body 10 and the bottom plate 20 have contact surfaces between them. All or part of the structure is watertightly secured.

Further, in the invention according to claim 2, a mold for molding a specimen for concrete strength test is formed with a projecting edge 10c at one opening peripheral edge along the peripheral edge, and the projecting edge 10 is formed.
The tubular body 10 made of plastic, the base portion of which is an annular step 10d along the inner circumference of the opening, and the tubular body 10 so as to contact the step surface 10d ′ of the step 10d of the tubular body 10. A formwork including a disc-shaped metal bottom plate 20 that is inserted into the one opening of the body 10 and closes the opening, wherein the cylindrical body 10 and the bottom plate 20 are the protrusions 10c. Melting,
The structure is watertightly fixed by deformation.

Further, in the invention according to claim 3, a concrete strength test sample forming mold is provided with a plastic cylindrical body 10 having an annular step 10e provided along the inner circumference of one opening. , The tubular body 10 so as to come into contact with the step surface 10e ′ of the step portion 10e of the molded tubular body 10.
Disk-shaped metal bottom plate 20 that is inserted into the cylindrical body 10 to close one opening of the cylindrical body 10, and a plastic ring that is fitted into the cylindrical body 10 through the one opening of the cylindrical body 10. And a frame 30 having a structure in which the annular frame 30 is watertightly attached to all or part of a contact surface with the tubular body 10.

Further, in the invention according to claim 4, each of the concrete strength test specimen forming molds according to claim 1, claim 2 or claim 3 is formed on the peripheral surface of the tubular body 10. The cylindrical body 10 has a structure including a cut surface portion 11 divided by at least two grooves 12 provided from one opening edge toward the other opening edge.

[0014]

The mold for molding a concrete strength test specimen according to the present invention has a structure including a tubular body 10 and a metal disc-shaped bottom plate 20 that closes one opening of the tubular body 10. Since it has, it is possible to form a columnar specimen by driving concrete into the mold.

According to the first aspect of the present invention, the tubular body 10 is provided with an inward flange 10a at one opening edge thereof, and the metal bottom plate 20 is in contact with the flange 10a. 10 has a structure in which one opening of the tubular body 10 is closed and the tubular body 10 and the bottom plate 20 are watertightly fixed on all or a part of their contact surfaces. The sealing property between the tubular body 10 and the bottom plate 20 is high. Further, since the bottom plate 20 is in contact with the collar 10a that can be molded with high dimensional stability, the bottom plate 20 can be assembled so as to be orthogonal to the cylinder axis of the cylindrical body 10 exactly.

Further, in the invention as claimed in claim 2, in particular, a projecting edge 10c is formed along one of the peripheral edges of the opening of the cylindrical body 10, and the base of the projecting edge 10c extends along the inner circumference of the opening. The bottom plate 20 is made of a metal and serves as an annular step 10d.
Is inserted from the one opening of the tubular body 10 so as to come into contact with the step surface 10d ′ of the step portion 10d of the tubular body 10 to close the opening, and the tubular body 10 and the bottom plate 20 are provided.
Since they are fixed in a watertight manner by melting and deforming the projecting edge 10c, the sealing property between the cylindrical body 10 and the bottom plate 20 is also high here. Further, since the bottom plate 20 is brought into contact with and supported by the step surface 10d ′ of the step portion 10d, the bottom plate 20 can be assembled so as to be orthogonal to the cylinder axis of the cylindrical body 10 exactly.

Further, particularly in the invention according to claim 3, an annular step portion 10e is formed along the inner circumference of one opening of the tubular body 10, and the step of the step portion 10e of the molded tubular body 10 is formed. A disc-shaped metal bottom plate 20 that closes one opening of the tubular body 10 so as to come into contact with the surface 10e ′ is put into the tubular body 10, and the tubular body 10 is opened from the one opening. Form 1
Since the ring-shaped frame 30 is fitted in the inside of the ring 0, and the ring-shaped frame 30 is watertightly attached to all or part of the contact surface with the tube-shaped body 10, the tube-shaped body 10 and the bottom plate are also here again. 20
It is said that the sealability with is high. Further, since the bottom plate 20 is supported by being brought into contact with the step surface 10e 'of the step portion 10e, the bottom plate 20 can be assembled so as to be orthogonal to the cylinder axis of the cylindrical body 10 accurately.

[0018]

EXAMPLES Hereinafter, typical examples of the mold for molding a concrete strength test specimen according to the present invention will be described with reference to FIGS. 1 to 9. 1 is a perspective view of the molding form according to the first embodiment as viewed from above, FIG. 2 is a perspective view of the molding form as viewed from below, and FIG. 3 is the use of the molding form. 5 is a perspective view showing a state, FIG. 4 is a side view of the molding frame, and FIG.
6 is a plan view of the molding frame, FIG. 6 is a cross-sectional view taken along the line AA in FIG. 4, FIG. 7 is a main part plan view showing an enlarged portion B in FIG. 5, and FIGS. FIG. 10 is a partially cutaway side view showing the bottom of the molding formwork according to the embodiment, and FIG. 10 is a partially broken side view showing the bottom of the molding formwork according to the third embodiment.

[Molding Form According to First Embodiment] A forming form according to this embodiment has a cylindrical body 10 formed by molding a plastic material and one opening of the cylindrical body 10. It is composed of a metal disc-shaped bottom plate 20 for closing.

The bottom plate 20 is provided so as to close the opening on one side of the cylindrical body 10. The bottom plate 20 is attached to the tubular body 10 by directing an inward facing collar 10a provided in one opening of the tubular body 10 along the inner circumference of the opening toward the inside of the tubular body 10. The brim 1 is formed so that the peripheral surface of the bottom plate 20 is in contact with the brim surface 10 a ′.
0a into the tubular body 10 and then the collar 10a
This is done by fixing all or part of the contact surface between the bottom plate 20 and the bottom plate 20. This fastening prevents leakage of concrete or water from the contact surface, so that the collar surface 10a ′ and the bottom plate 2 are prevented.
0 is watertightly welded or adhered to the contact point with the peripheral surface of 0,
Alternatively, it is performed by water-tightly welding, adhering, etc., the contact portion between the peripheral end surface of the bottom plate 20 and the inner surface of the tubular body 10 near the collar 10a '. From the standpoint of further enhancing the watertightness, it is preferable to perform the above-mentioned fastening by welding or the like at both contact points. The welding referred to in the present specification is a means for irradiating a high frequency and an ultrasonic wave in the vicinity of the contact point to melt and then cure a part of the plastic at the point to fix the bottom plate 20. Means various fastening means utilizing melting of plastic, such as means for placing the bottom plate 20 in an overheated state and melting and then curing a part of the plastic at the contact point to fix the bottom plate 20. To do. Further, the term “adhesion” as used in the present specification does not include welding in the above-mentioned sense, but means a means for fixing the contact points using various adhesives.

On both sides in the diametrical direction of the tubular body 10, cut from the upper opening edge of the tubular body 10 toward the edge of the lower opening of the tubular body 10 closed by the bottom plate 20. The surface portions 11, 11 are formed. The cut-off surface portion 11 has a length from the upper opening edge of the tubular body 10 to the vicinity of the lower opening edge, and the tubular body 1 extends along the tubular axis of the tubular body 10.
2 grooves 12, 1 provided by carving from the outer peripheral surface side of 0
It is provided by being separated from the other peripheral surface portion of the tubular body 10 by 2. In this embodiment, the two grooves 12, 12
Are provided substantially parallel to each other, so that the width dimension of the cut-off surface portion 11 is set to be substantially the same at any position of the tubular body 10. Further, as shown in FIGS. 5 to 7, the groove 12 has a cross-sectional shape that is similar to that of the groove 1.
The one groove side surface 12a and the other groove side surface 12b are in contact with each other on the groove bottom side, and the groove bottom is formed in an acute angle shape.

An edge portion of the cut-off surface portion 11 which is in contact with the upper opening of the tubular body 10 projects toward the outside of the tubular body 10 and is substantially orthogonal to the outer peripheral surface of the tubular body 10. A tongue piece 11b having a surface is formed to have substantially the same width dimension as the cut surface portion 11. The tongue piece 11b is provided with a hole 11b 'through the thickness direction thereof. The hole 11b 'is provided for the purpose of facilitating gripping the tongue piece 11b.

In addition, at the upper opening edge of the cylindrical body 10,
An outward flange 13 is provided around the tongue piece 11b except for the location where the tongue piece 11b is provided. 1, 2, 3, and 7
As shown in FIG. 5, a connecting piece 13a is installed between both side edges of the tongue piece 11b, which are oriented in the circumferential direction of the tubular body 10, and an edge of the collar 13 that is in contact with the tongue piece 11b. Therefore, the rigidity of the tubular body 10 is enhanced.

The outer peripheral surface of the cut surface portion 11 is
An appropriate scale 11a is provided. Since plastic has a light-transmitting property as compared with metal, it is possible to grasp the amount of concrete cast inside the tubular body 10 from the outside of the tubular body 10. To grasp this, the scale is used. If used, the amount of concrete poured into the tubular body 10 can be easily and accurately known. As a result, it is possible to appropriately pour concrete into the formwork into substantially equal layers, which is required by the JIS standard (see JIS standard number A1132-4.3.1).

A concrete specimen is molded by driving concrete into the bottomed cylindrical body 10 thus constructed in accordance with JIS standard.

As shown in FIG. 3, the molded test piece has a cylindrical shape with the cut surface portions 11, 11 provided at two positions of the cylindrical body 10 with the groove 12 as a cut line. It is taken out from the body 10, and the peripheral side wall of the cylindrical body 10 is divided into two parts, and the divided peripheral side walls are peeled off from the sample body, so that the cylindrical body 10 is taken out from the mold. The cutting of the cut surface portion 11 is performed while holding the tongue piece 11b.
By pulling the tubular body 10 downward, the connecting piece 13a provided between the tongue piece 11b and the collar 13 is cut off, and the cut surface 11 and the cutting piece 11 are formed along the groove 12. This is performed by separating the other surface portion of the tubular body 10. Here, since the groove bottom side of the groove 12 is formed to have an acute-angled cross section, when the cut surface portion 11 is pulled downward of the cylindrical body 10, the groove bottom of the groove 12 and the cylindrical shape are formed. The stress generated by the pulling tends to concentrate on the thick portion of the tubular body 10 between the inner peripheral surface of the body 10 and the cutting surface portion 12 can be easily cut off. Further, in order to make the cutting of the cutting surface portion 12 easier,
Even when a cut is further made along the groove 12 with a cutter knife or the like, the groove 12 having an acute-angled groove bottom makes it easy to attract the blade edge of a knife or the like into the groove 12 and accurately cuts the groove bottom. Let them know.

In the formwork according to this embodiment, since the cylindrical body 10 is made of a plastic material that is less likely to be plastically deformed than a metal or the like but is easily elastically deformed as compared with a metal or the like,
When this concrete is driven, even if the cylindrical body 10 or the like is hit with a mallet or the like so that the concrete is evenly distributed in the storage space, the cylindrical body 10 or the like will not be deformed, and the cylindrical body 10 or the like will not be deformed. The specimen will not be distorted or damaged due to such deformation. Further, since concrete has a property of not easily adhering to plastic, it does not hinder the demolding of the specimen even if the mold release material such as mineral oil is not applied to the inner surface of the mold. Even if the surface of the test piece and the inner surface of the tubular body 10 are adhered to each other with time, the peripheral side wall of the tubular body 10 separated by the cutting of the cut surface portion 11 is placed outside. By bending, the tubular body 10 can be easily peeled from the surface of the sample, and the molding operation of the sample can be performed smoothly.

The cut-off surface portion 11 provided on the tubular body 10 is not limited to the embodiment described above, and for example, from the upper opening edge side of the tubular body 10 toward the lower opening edge side, The two grooves 12 forming the cutting surface portion 11 are provided so as to approach each other, and the width dimension of the cutting surface portion 11 is gradually reduced from the upper side to the lower side of the tubular body 10. May be. Further, the cut surface portion 11 may be configured by providing the two grooves 12, 12 in a spiral shape on the outer peripheral surface of the tubular body 10. Furthermore, the outer peripheral surface of the tubular body 10 may be provided with three or more cut-off surface portions 11.

[Molding Form According to Second Embodiment] In the forming form according to the second embodiment shown in FIGS. 8 and 9, the cylinder of the bottom plate 20 for closing one opening of the cylinder 10 is used. The assembling structure for the body 10 is different from that of the first embodiment. Since the rest of the structure is the same as that of the first embodiment, the same structural parts are given the same numbers as the numbers given in the drawings showing the first embodiment and the description thereof is omitted.

As shown in FIG. 8, in the tubular body 10 constituting the mold according to this embodiment, a protruding edge 10c is formed along the peripheral edge of one opening, and the protruding edge 10c is formed.
The base is formed to have an annular step 10d along the inner circumference of the opening. Then, the bottom plate 20 is placed so that the peripheral surface of the bottom plate 20 contacts the step surface 10d ′ of the step portion 10d of the tubular body 10 formed in this manner, which is directed toward the outside of the tubular body 10. After being put into the cylindrical body 10, as shown in FIG. 9, the protruding edge 10c is melted to melt the peripheral surface of the bottom plate 20 facing outward of the cylindrical body 10. The bottom plate 20 is watertightly attached to the tubular body 10 by being wrapped in the protruding edge 10c and then cured.

[Molding Form According to Third Embodiment] FIG.
In the formwork according to the third embodiment shown in FIG. 3, the assembly structure of the bottom plate 20 that closes one opening of the tubular body 10 to the tubular body 10 is different from that of the first embodiment. Since the rest of the structure is the same as that of the first embodiment, the same structural parts are given the same numbers as the numbers given in the drawings showing the first embodiment and the description thereof is omitted.

As shown in FIG. 10, in the tubular body 10 constituting the mold according to this embodiment, an annular step portion 10e is formed along the peripheral edge of one opening, and the step portion is formed. An outwardly spread tapered surface 10f is formed between the step surface 10e 'of 10e and the opening end of the tubular body 10. Then, the step portion 1 of the tubular body 10 molded in this way
0e, a step surface 10e ′ directed to the outside of the tubular body 10
After the bottom plate 20 is inserted into the cylindrical body 10 so that the peripheral surface of the bottom plate 20 is in contact with the bottom plate 20, the stepped surface 10e is fitted with a plastic annular frame 30 as shown in FIG. 'And the annular frame 30 sandwich the bottom plate 20. The annular frame 30 is provided on one surface with an annular fitting convex portion 30a having an outer diameter that fits into the one opening of the cylindrical body 10, and the fitting convex portion 30a is inside the opening of the cylindrical body 10. And then assembled to the tubular body 10. The fitting convex portion 30a is provided with a tapered surface 30a 'on the outer surface of the annular frame 30, the taper surface 30a' having a hem-spreading shape from the tip of the fitting convex portion 30a toward the base side.
The tapered surface 30a 'is in contact with the tapered surface 10f of the tubular body 10. Then, the tapered surfaces 30 a ′, 10 f that are in contact with each other, or the one open end surface 10 g of the tubular body 10 and the annular frame 30.
Surface 30 located outside the base of the fitting protrusion 30a
Both b or their contacting surfaces are watertightly fixed to each other to hold the bottom plate 20 held between the cross section 10e of the tubular body 10 and the annular frame 30.

The fastening referred to in this embodiment also means welding, adhesion or the like of the contact surface to be fastened, as in the case of the first embodiment, and the specific content thereof is the same as that of the first embodiment. It is the same.

[0034]

According to the first aspect of the invention, there is provided a mold for molding a concrete strength test specimen, which is provided with an inward-facing collar 10a at one opening edge of the plastic-molded tubular body 10 and is made of metal. The bottom plate 20 made of metal is inserted into the tubular body 10 so as to be in contact with the collar 10a to close one opening of the tubular body 10, and the tubular body 10 and the bottom plate 20 are
Since all or a part of the contact surfaces of both are watertightly secured, it is possible to secure a high sealability between the tubular body 10 and the bottom plate 20 without using a separate sealing means. You can In addition, since the bottom plate 20 is put into the tubular body 10 and fixed after the tubular body 10 is molded,
The distortion of the tubular body 10 that occurs when the bottom plate is an insert of the tubular body 10 does not occur, and the plastic mold having the bottom plate 20 having high flatness can be accurately formed. . Further, since the bottom plate 20 is in contact with the brim 10a which can be molded with high dimensional stability, the cylindrical body 10
The bottom plate 20 can be assembled so as to be exactly orthogonal to the cylinder axis, and the sample can be molded in a state in which the end surface of the sample to be molded is exactly orthogonal to the axis of the sample.

Particularly, in the concrete-molding test-piece forming mold according to the invention as defined in claim 2, a projecting edge 10c is formed at one opening peripheral edge of the tubular body 10 along the peripheral edge,
Moreover, the base of the projecting edge 10c is an annular step 10d along the inner circumference of the opening, and the metal bottom plate 20 is in contact with the step surface 10d 'of the step 10d of the tubular body 10. The tubular body 10 and the bottom plate 20 are structured such that the tubular body 10 is inserted into the one opening to close the opening.
Since the projecting edge 10c is watertightly fixed by melting and deforming, a high sealing property between the tubular body 10 and the bottom plate 20 can be ensured here as well. In addition, the bottom plate 20 is
After the tubular body 10 is molded, it is put into the tubular body 10 and fixedly attached thereto, so that distortion or the like of the tubular body 10 that occurs when the bottom plate 20 is an insert of the tubular body 10 occurs. Instead, it is possible to accurately form a plastic mold frame having the bottom plate 20 having high flatness. Also, the bottom plate 2
Since 0 is supported by being brought into contact with the step surface 10d ′ of the step portion 10d, the bottom plate 20 can be assembled so as to be orthogonal to the cylinder axis of the cylindrical body 10 exactly, and The specimen can be molded in a state where the end surface is exactly orthogonal to the axis of the specimen.

Further, in the mold for molding a specimen for concrete strength test according to the third aspect of the present invention, an annular step 10e is formed along the inner circumference of one opening of the tubular body 10 and is molded. Stepped surface 10e 'of the stepped portion 10e of the tubular body 10
A disc-shaped metal bottom plate 20 that closes one opening of the tubular body 10 so as to be in contact with is inserted into the tubular body 10, and the tubular body 10 is opened from the one opening of the tubular body 10. Since the annular frame 30 is fitted in the inside and the annular frame 30 is watertightly fixed to all or part of the contact surface with the tubular body 10, the tubular body 10 and the bottom plate are also here. It is possible to secure a high sealing property with 20. In addition, the bottom plate 20
Is inserted into the tubular body 10 after the tubular body 10 is molded and fixed therewith, so that distortion or the like of the tubular body 10 that occurs when the bottom plate 20 is used as an insert of the tubular body 10 is prevented. It does not occur, and it is possible to accurately form a plastic mold having the bottom plate 20 having high flatness. Further, since the bottom plate 20 is supported by being brought into contact with the step surface 10e ′ of the step portion 10e, the bottom plate 20 can be assembled and formed so as to be orthogonal to the cylinder axis of the cylindrical body 10 accurately. It is possible to mold the specimen such that the end surface of the specimen is exactly perpendicular to the axis of the specimen.

In any of the concrete strength test specimen forming molds according to the inventions of claims 1 to 3, since the tubular body 10 is made of plastic, it is lightweight and easy to handle and safe. is there. Moreover, even if the mold is hit to fill the mold with no gaps, the cylindrical body 10 will not be deformed. Further, since concrete has a property of being hard to adhere to plastic, it is possible to apply a release material to the inner surface of the cylindrical body 10 without
There is no problem in demolding the specimen. Further, even if the surface of the specimen and the inner surface of the tubular body 10 are in a state of being adhered to each other with time, the peripheral side wall of the tubular body 10 separated by the cutting of the cut surface portion 11 is bent outward. By doing so, the tubular body 10 can be easily peeled from the surface of the sample.

Further, in the mold for molding a concrete strength test specimen according to the invention of claim 4, from the one opening edge of the tubular body 10 to the other opening edge on the peripheral surface of the tubular body. Since the cut-off surface portion 11 divided by at least two grooves 12 provided toward the cut-off surface portion 11 is provided, the tubular body 10 is cut off by the cut-off surface portion 11.
The peripheral side wall of can be divided into multiple pieces, and this division makes it easy to take out the specimen from the mold.
It does not damage the specimen when taking it out. Also,
Since the divided cylindrical body 10 is made of plastic, when the cut-off surface portion 11 is cut off, the edge of the divided peripheral side edge of the cylindrical body 10 and the cut-off surface portion 11 are cut off. Even if the operator touches the edge, the operator will not be injured, and the safety of the work of taking out the sample from the mold can be secured.

Further, it is simple in structure, has no fragile portion in strength, is easy to mold, and has a feature that the cost of this type of frame can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a molding frame according to a first embodiment as viewed from above.

FIG. 2 is a perspective view of the molding frame according to the first embodiment as viewed from below.

FIG. 3 is a perspective view showing a usage state of the molding frame according to the first embodiment.

FIG. 4 is a side view of the molding frame according to the first embodiment.

FIG. 5 is a plan view of a molding form according to the first embodiment.

6 is a cross-sectional view taken along the line AA in FIG.

FIG. 7 is an enlarged plan view of a B part in FIG.

FIG. 8 is a partially cutaway side view of a bottom portion of a molding form according to a second embodiment.

FIG. 9 is a partially cutaway side view of a bottom portion of a molding form according to a second embodiment.

FIG. 10 is a partially cutaway side view of a bottom portion of a molding form according to a third embodiment.

[Explanation of symbols]

 10 Cylindrical body 11 Cutting surface part 12 Groove 13 Collar 20 Bottom plate 30 Annular frame

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Terashima, 184 Maioka-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture 1 share company Nifco

Claims (4)

[Claims] 1. A plastic cylindrical body having an inward flange at one opening edge, and a cylindrical body inserted into the cylindrical body so as to come into contact with the flange of the molded cylindrical body. A mold provided with a disk-shaped metal bottom plate that closes one opening of the cylindrical body, wherein the tubular body and the bottom plate are watertightly fixed on all or a part of their contact surfaces. A mold for molding a specimen for concrete strength testing, which is characterized in that 2. A plastic cylindrical body having a projecting edge formed along one of the peripheral edges of the opening, and the projecting edge base being an annular step along the inner circumference of the opening. A mold provided with a disc-shaped metal bottom plate that is inserted from the one opening of the tubular body so as to contact the step surface of the stepped portion of the tubular body and closes the opening, A mold for molding a specimen for concrete strength test, characterized in that the tubular body and the bottom plate are watertightly fixed by melting and deformation of the projecting edge. 3. A plastic cylindrical body having an annular step portion provided along the inner circumference of one opening, and the tubular shape so as to contact the step surface of the step portion of the molded cylindrical body. A disc-shaped metal bottom plate that is inserted into the body and closes one opening of the tubular body, and a plastic annular frame that is fitted into the tubular body through the one opening of the tubular body A mold frame for concrete strength test specimen molding, characterized in that the annular frame is watertightly attached to all or part of a contact surface with the tubular body. 4. A peripheral surface of the tubular body is provided with a cut surface portion divided by at least two grooves provided from one opening edge of the tubular body toward the other opening edge. Claim 1, Claim 2 or Claim 3 characterized
Form for molding a specimen for the concrete strength test described.