JP2020101501A - Resin mold frame for concrete strength test sample - Google Patents

Abstract

To provide a light mold frame made of resin used for forming a sample for a concrete strength test, which frame not requiring assembling or cleaning.SOLUTION: The present invention relates to a mold frame 1 in the shape of a box, the mold frame including a side surface 3 and a bottom surface integrally formed into the shape of a box of synthetic resin, flange parts 5a, 5b, and 5c with a predetermined width in the outer edge of the upper surface of the box, and a plurality of ribs 6 continuously formed at regular intervals in the outer edge of the side surface 3 and the bottom surface, the flange part 5a located on the upper surface side in the usage having a larger width than the other flange parts and having a plurality of jig holes. With the structure, the rigidity (strength) of the mold frame 1 is excellent and the assembly work as required to build an existing steel mold frame is not required, and there are no gaps as found in a steel mold frame. Therefore, a mold frame can be attained which solves the problem of leakage of concrete, can be easily carried due to its reduced weight, and has a high operability.SELECTED DRAWING: Figure 5

Description

The present invention relates to a resin mold for forming a specimen (hereinafter referred to as a boss specimen) for directly inspecting the strength of structural concrete.

As this type of formwork, a plurality of facilities are known in the art. For example, as a first known technique, a test sample collecting cylinder is attached to a hole provided in a concrete pouring form with the cylinder protruding from the inside to the outside of the form. A test sample collecting tube characterized in that a screening net for taking in only the mortar component of the cast concrete is provided in the opening for taking the test object into the internal space of the tube on the mold mounting side of the tube. , (Patent Document 1).

According to the test sample collecting cylinder according to the first known technology, the selection net for taking in only the mortar component of the cast concrete is provided in the opening for taking the test sample into the internal space of the cylinder on the mold mounting side of the cylinder. Since it is provided, it is possible to obtain a test body of only the mortar content of the cast concrete.

A second known technique is a mold for molding a concrete specimen made of a synthetic resin, which is a thin-walled tubular body in which a tubular peripheral wall and a perforated bottom plate are integrated. A plurality of cut grooves connected by a tearable ultrathin bottom are provided between the upper and lower ends of the peripheral wall of the body, and a pair for tearing the peripheral wall at the cut grooves is provided at an opposing position of the upper rim of the tubular body. Is provided, and a non-perforated bottom plate is press-fitted onto the bottom of the cylindrical body, which is a formwork for a concrete specimen (Patent Document 2).

According to the sample mold of the second known technique, the concrete sample mold can be configured as a lightweight and inexpensive synthetic resin molded product with a simple configuration, and moreover, it can be formed from the mold. No tools, etc. are required to take out the specimen, and it can be taken out easily by hand, and the used formwork used as waste can be made of only a small amount of synthetic resin material. Further, since the tubular body is formed of a synthetic resin having a low thermal conductivity, it is possible to place a specimen under curing or curing in an appropriate environment and manufacture a specimen of good quality. ..

Patent Publication of Japanese Patent No. 3357316 Japanese Unexamined Patent Publication No. 2009-190225

In the invention of the first known technology, the mold for collecting the test body is a cylinder, and the mold is mounted on an opening for taking the test body into the cylinder inner space on the mold mounting side of the cylinder. Since the selection net that takes in only the mortar component of concrete is provided, the concrete specimens that are sampled contain only the mortar component, and the jari (pebbles) that contribute to the strength of concrete are removed. However, there is a problem (subject) that it is not possible to obtain substantial test results based on Japanese Industrial Standards.

Further, the second known formwork for concrete specimen is a thin-walled tubular body in which a tubular peripheral wall and a perforated bottom plate are integrated, and is press-fitted onto the bottom of the tubular body. Since a bottom plate is provided and a high-strength outer shell is fitted on the outer shell, which requires a double structure, the structure is complicated and the operability is substantially reduced when creating the specimen. There is a problem (problem) that the cost is bad and the cost is high.

In order to solve the above-mentioned problems, an object of the present invention is to provide a lightweight resin mold which is formed by a molding means of synthetic resin, has a required strength, is structurally simple and inexpensive, and is disposable. It is what

The present invention is, as a specific means for solving the above-mentioned problems, a box-shaped resin mold for forming a concrete strength test specimen, which is formed of a synthetic resin into a box-shaped integrally formed side surface and bottom surface. Flanges having different widths are formed on the outer peripheral portion of the upper surface of the box shape, and a plurality of ribs are continuously formed on the outer peripheral portions of the side surface and the bottom surface at a required interval. The flange part is made wider than the other flange parts and a plurality of jig holes are formed, which provides a lightweight resin mold for concrete strength test specimens. is there.

In the above invention, the synthetic resin is a high-density polyethylene resin or polypropylene resin having good peelability; V-shaped cut grooves are provided in the outer corners of the box-shaped box; An additional requirement is that a plurality of air vent holes are formed on the side surface, which is the upper side of the mold, so as not to create air pockets when pouring concrete.

According to the lightened resin mold for the concrete strength test specimen according to the present invention, since it is an integrally molded product made of resin, it is not necessary to perform an assembly work like a conventional steel mold, and the steel mold is used. Since there is no gap like the formwork, concrete does not leak, and it is lightweight, easy to carry, has good workability, and achieves significant cost reduction.
In addition, since it is made of a resin with good peeling property and V-shaped cut grooves are provided at the four corners on the outer side, the mold releasing work is easy, and the polyethylene resin or the polypropylene resin can be used even if it is discarded as a disposable product. It also has the excellent effect of being an eco-friendly product.
Further, after dividing the resin mold, the box-shaped mold can be used as a resin box as a packaging material as it is, and it can be utilized during transportation work, which is an excellent effect.

It is a top view of the resin-made frame for obtaining the sample which can directly inspect the strength of structure concrete concerning an embodiment of the invention. It is a side view of the long side of the resin mold. It is a side view of the short side of the resin mold. It is a bottom view of the resin mold. It is the perspective view seen from the upper surface side of the resin mold. It is the perspective view seen from the bottom face side of the resin mold. (A), (b) is explanatory drawing which expanded and showed the short part side of a pair of V-shaped notch groove|channels which can be peeled provided in the outer four corner corner part in the same resin mold. It is sectional drawing which showed the condition which attached the resin-made mold to the mold for structure concrete construction. FIG. 6 is a cross-sectional view showing a situation where the resin mold frame is separated from the structure.

The present invention will be described in detail based on the illustrated embodiments.
First, referring to FIGS. 1 to 4 showing a preferred embodiment, a box-shaped resin mold 1 for obtaining a specimen capable of directly inspecting the strength of structural concrete, for example, preferably as a material, Highly peelable, high density synthetic resin such as polyethylene resin or polypropylene resin is used, the opening 2 is formed on the upper surface, and the side surface 3 has a thickness of at least 3 mm (long side 3a, short side 3b). And the bottom surface 4 are integrally formed into a rectangular box shape.

Further, in order to improve the overall rigidity (strength) of the box-shaped resin mold frame 1, a flange portion 5 having a required width is integrally molded (formed) on the outer peripheral surface of the upper surface, and the side surface 3 and the bottom surface are formed. A plurality of ribs 6 having a required width and a required height are continuously formed at a required interval and integrally molded (formed) on the outer peripheral surface of 4. In this case, as shown in FIG. 1, the side surfaces 3 that are upper and lower sides when the resin mold 1 is used, that is, the flange portions 5a and 5b formed on the long side 3a are formed on the short side 3b. The flange portion 5c is formed to be several times wider than the flange portion 5c. For example, the flange portion 5b formed on the lower side surface is formed to be about twice as wide as the flange portion 5c formed on the short side 3b. The flange portion 5a formed on the long side 3a, which is the upper side, is formed to be about four times as wide as the flange portion 5c. As shown in FIG. 2, a plurality of air vent holes 10 are formed on the long side 3a, which is the upper side, to eliminate air pockets when pouring concrete, and after the concrete is cured, the structure is removed from the specimen. A plurality of jig holes 11 for holding or inserting jigs for separation are provided in the flange portion 5a.

Further, with respect to the formation of the ribs 6, the ribs 6 are continuously formed from one side surface 3 of the box shape to the other side surface 3 opposite thereto through the outer peripheral surface of the bottom surface 4. In this case, the other side face to be opposed means, in short, to the other long side side 3a to be opposed in the case of the long side 3a and to the other end side 3b to be opposed in the case of the short side 3b. Since they are formed continuously through the outer peripheral surface of the bottom surface 4, the rib 6a provided on the long side 3a and the rib 6b provided on the short side 3b of the box-like shape are formed on the bottom surface as shown in FIG. The outer peripheral surface of 4 is integrally molded (formed) in a crossed state, and the strength and rigidity of the side surface 3 and the bottom surface 4 are greatly enhanced so as not to be deformed during concrete pouring. Although not expressed in the box-shaped resin frame 1, it should be called a slight die-cutting slope on the side surfaces 3 (3a, 3b) so that the opening 2 side is slightly wider than the bottom surface 4. It is formed with a taper.

In addition, in FIGS. 5 and 6, a pair of V-shapes are provided so that concrete hardened by being hung from the side surfaces 3a and 3b of the box-shaped outer four corner corners to the flange portion 5 and easily poured can be demolded. 7A and 7B are formed in such a manner that the notch grooves 7 and 8 of FIG. 7A are provided close to each other so that the four corners can be peeled off, and that each end of each notch groove 7 and 8 maintains a certain degree of strength. ) As shown in FIG. It should be noted that the flange portions 5a and 5b are provided with small holes 9 into which hook-shaped jigs and mounting screws or bolts, which assist in the work of peeling off each of the four corners and the use as the resin mold 1, can be inserted. .. In addition, in the box-shaped resin mold 1 according to the above-mentioned embodiment, it is possible to use a material that is not a recycled resin having good peelability as a material to be used.

In the resin mold 1 thus formed, as shown in FIG. 8, a hole 13 of a required size is opened in the mold 12 forming the concrete structure, and the resin mold 1 is formed in the hole 13. The side surface 3 (the body portion including 3a and 3b) is fitted, and the flange portions 5a, 5b, and 5c are brought into contact with the inner side of the form 12, so that the side surface 3 (the body portion) projects outside the form frame 12. It is attached. At the time of this attachment, a metal molding plate 14 is arranged on the front surface side of the flange portions 5a, 5b, 5c of the resin mold 1 and a metal slit plate 15 is provided at a position corresponding to the flange portion 5a on the upper surface side. Arrange. The outer diameter of the molding plate 14 is substantially the same as the outer diameter of the flange portions 5a, 5b, 5c of the resin mold 1 and is slightly smaller than the opening 2 of the resin mold 1 as a whole. An opening 16 is formed, and the slit plate 15 is slightly thicker than the molding plate 14 and slightly wider than the flange 5a, and the lower end 17 is sharply formed. Then, the bolt 18 is attached in advance by screwing it into the forming plate 14 through the jig hole 11 and engaging the small diameter portion of the tip with the slit plate 15.

In this way, the resin mold 1 attached to the mold 12 forming the structure inevitably comes out from the opening 16 of the forming plate 14 when the concrete 19 forming the structure is placed in the mold 12. Since there is no air reservoir inside the resin mold 1 due to the presence of the air vent holes 10 because the air flows into the resin mold 1, the cast concrete 19 fills every corner of the resin mold 1. is there. The cast concrete 19 is cured and hardened in the mold 12 and the resin mold 1 under the same environment for a required period.

Then, when the structural concrete is hardened and the formwork 12 is removed, as shown in FIG. 9, first, using a spanner or a ratchet wrench 20, the bolt 18 is turned in the tightening direction, and the molding plate 14 becomes a slit plate. A strong force acting in a direction away from 15 is applied. By this separating action, vertical cracks (cracks) 21 are formed in the concrete of the opening 16 in the molding plate 14, and the resin mold 1 together with the molding plate 14 together with the molding plate 14 causes the structural concrete together with the molding plate 14 due to the cracks 21. The concrete in the resin mold 1 can be removed from the resin mold 1 and stored inside the same structure as a specimen for testing the structure concrete. To do. In addition, at the time of transportation, it can be used as it is as a packaging material for a resin box.

The box-shaped resin mold 1 in the above-described embodiment is lightweight, but it is not deformed by work such as concrete driving, compaction, and transportation, and a test piece having a predetermined size can be accurately formed. Regarding the box-shaped resin mold 1, the specimen is rectangular, and for example, the length, width, and length are 75 mm×75 mm×150 mm, 100 mm×100 mm×100 mm, 100 mm×100 mm×200 mm, and 125 mm×125 mm. To reduce the weight of the resin mold for 250 mm.

A box-shaped resin frame 1 for forming a concrete strength test specimen according to the present invention, wherein a side surface 3 and a bottom surface 4 are formed of a synthetic resin into an integrally molded box shape, and an upper surface of the box shape. Flange portions 5 (5a, 5b, 5c) having different widths are formed on the outer peripheral portion, and a plurality of ribs 6 are continuously formed on the outer peripheral portions of the side surface 3 and the bottom surface 4 at a required interval. Since the flange portion 5a on the side is formed to have a width that is several times the width of the other flange portions 5b and 5c and a plurality of jig holes are formed, the rigidity of the resin mold 1 is improved. It is excellent in (strength), does not require the assembly work like the conventional steel formwork, and has no gaps like the steel formwork, so concrete leakage does not occur and it is lightweight and portable. Since it is easy to perform, the workability is good, and the cost can be greatly reduced, it can be widely used for producing test pieces in this kind of industry.

1 Resin Formwork 2 Opening 3 Side 3a Long Side 3b Short Side 4 Bottom 5 5a, 5b, 5c Flange 6 Rib 6a Rib 6b provided on the long side Rib 7 provided on the short side 7 , 8 a pair of V-shaped notches
9 Small Hole 10 Air Venting Hole 11 Jig Hole 12 Formwork for Forming Concrete Structure 13 Hole of Required Size 14 Forming Plate 15 Slit Plate 16 Forming Plate 17 Lower End 18 Bolt 19 Concrete 20 Ratchet Wrench 21 Crack

Claims (4)

A box-shaped resin mold for forming a concrete strength test specimen,
The side surface and bottom surface are made of synthetic resin into an integrally molded box shape,
Flange portions having different widths are formed on the outer peripheral portion of the upper surface of the box shape, and a plurality of ribs are continuously formed at required intervals on the outer peripheral portions of the side surface and the bottom surface,
A lightweight resin mold for concrete strength test specimens, characterized in that the flange portion on the upper surface side when used is formed to be wider than the width of other flange portions and also has a plurality of jig holes. frame. The lightweight synthetic resin mold for a concrete strength test specimen according to claim 1, wherein the synthetic resin is a polyethylene resin or a polypropylene resin having a good peeling property from concrete. A lightweight resin mold for a concrete strength test specimen according to any one of claims 1 to 2, wherein V-shaped cut grooves are provided in the box-shaped outer four corners. The concrete strength test specimen according to any one of claims 1 to 3, wherein a plurality of air vent holes are formed on the side surface serving as the upper side of the box mold so as not to generate air pockets when pouring concrete. A lightweight resin mold.

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