JP7202177B2 - Formwork for concrete strength test specimen - Google Patents

Description

TECHNICAL FIELD The present invention relates to a lightweight form for forming specimens for compressive strength tests, bending strength tests, and length deformation tests of concrete.

A plurality of facilities are known in the art for this type of formwork. For example, as a first known technique, a cylindrical upper frame and a lower frame are integrated by sandwiching a donut plate having an outer shape substantially the same as the outer shape of the formwork between both frames, and the upper end of the upper frame and the lower frame are integrated. A formwork in which an upper lid and a lower lid are fixed to the lower end of a lower frame and an insert is supported by each lid, and the upper lid communicates with a side frame having the same shape as the formwork and a screw hole provided in the insert at the center. A supporting plate with a guide hole and an opening for pouring concrete surrounded by a side frame and a supporting plate are formed. A specimen for a concrete strength test, characterized in that it consists of a lower plate having a hole, and the insert is fixed by screwing a bolt passing through a guide hole in the upper cover and the lower cover into a screw hole provided in the insert. (Patent Document 1).

According to the mold for manufacturing a specimen according to the first known technique, it can be applied to any strength property test, that is, it can be easily tested using a specimen of the same shape, and can replace the standard test method. It is possible to provide a test method.

As a second known technique, a bottom plate, two side plates erected on the bottom plate, and two end plates erected between the two side plates erected on the bottom plate are used. , and is assembled and fixed in a rectangular parallelepiped shape with an upper opening, wherein the side plate and the end plate are connected by penetrating the side plate and the end plate. A concrete specimen form for a bending strength test is characterized by being configured by tightening through connecting members (Patent Document 2).

According to the specimen formwork according to the second known technique, it can be easily assembled to allowable dimensions defined in Japanese Industrial Standards: JIS A 1132.

Japanese Unexamined Patent Publication No. 2008-128853 Publication of Japanese Patent Application Laid-Open No. 2017-142108

In the invention of the first known technology, as described in the second known technology, the assembly is complicated, the weight is heavy, and the manual assembly work is difficult. It is for a test method different from the concrete strength test method, and has a problem (problem) that test results based on Japanese Industrial Standards cannot be obtained.

Also, in the invention of the second known technology, as in the invention of the first known technology, the number of steel parts is large, the assembly is complicated, and the steel formwork is heavy and requires manual labor. Not only is it difficult to assemble by using a mold, but it is also time-consuming and costly, and it is necessary to reuse it even after demolding, so it is necessary to clean the formwork after use. It has a problem (problem) that it takes.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a disposable, lightweight mold formed by resin molding means that does not require assembly or cleaning work.

As a specific means for solving the above-mentioned problems, the present invention provides a box-shaped formwork for forming a specimen for a concrete strength test, wherein the side and bottom surfaces are integrally molded from a synthetic resin into a box-like form, A flange portion having a required width is 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 and bottom surfaces at required intervals . , a pair of V-shaped cut grooves are provided, and each end of each cut groove is formed so that the cut groove becomes shallower . It provides formwork.

In the above invention, an additional requirement is that the synthetic resin is a high-density polyethylene resin or polypropylene resin with good releasability.

According to the lightweight formwork for the concrete strength test specimen according to the present invention, since it is an integrally molded product made of resin, it does not require the assembly work of the conventional steel formwork, and the steel formwork Since there is no such gap, not only does the concrete not leak, but it is lightweight and easy to carry, and has excellent workability and can achieve a large cost reduction.
In addition, it is made of a resin with good releasability, and V-shaped cut grooves are provided at the four outer corners, making it easy to release the mold. It also has the excellent effect of being an environmentally friendly product.

1 is a plan view of a lightened formwork for a concrete strength test specimen according to an embodiment of the present invention; FIG. It is a side view of the long side of the lightened formwork. It is a side view of the short-side side of the same lightweight formwork. It is a bottom view of the same lightweight formwork. It is the perspective view seen from the upper surface side of the same lightweight formwork. It is the perspective view seen from the bottom face side of the same lightweight formwork. (a) and (b) are explanations schematically showing enlarged ends of a pair of peelable V-shaped cut grooves provided at the outer four corners of the lightened formwork. It is a diagram.

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 rectangular box-shaped formwork 1 for forming a concrete strength test specimen, for example, the material preferably has good peelability. , Using a synthetic resin such as high-density polyethylene resin or polypropylene resin, forming an opening 2 on the upper surface, the side surface 3 (long side 3a, short side 3b) and the bottom surface 4 having a thickness of at least about 3 mm It is formed into an integrally molded rectangular box shape.

In addition, in order to improve the rigidity (strength) of the box-shaped mold 1 as a whole, a flange portion 5 having a required width is integrally molded (formed) on the outer peripheral portion of the upper surface, and the side surfaces 3 and the bottom surface 4 are formed. A plurality of ribs 6 having a required width and a required height are integrally molded (formed) on the outer peripheral surface so as to be continuous with a required interval. In this case, it is formed continuously through the outer peripheral surface of the bottom surface 4 from one side surface 3 of the box shape to the opposite side surface 3 .

In this case, the other opposing side is, in short, up to the other opposing long side 3a in the case of the long side 3a, and up to the other opposing end side 3b in the case of the short side 3b. , and since they are continuously formed through the outer peripheral surface of the bottom surface 4, the ribs 6a provided on the long side 3a of the box shape and the ribs 6b provided on the short side 3b are arranged 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 bottom surface 4 that supports the weight during concrete placement are greatly enhanced. In the box-shaped formwork 1, although not shown, the side surfaces 3 (3a, 3b) are tapered so that the opening 2 side is slightly wider than the bottom surface 4. It is attached and formed.

Further, in FIGS. 5 and 6 , a pair of V-shaped joints are provided from the side surfaces 3a and 3b of the box-shaped outer four corners to the flange 5 so that the hardened concrete can be easily removed from the mold. The cut grooves 7 and 8 are provided close to each other so that the four corners can be peeled off. ) is formed to be shallow as shown in (b). The flange portion 5 is provided with a small hole 9 into which a hook-shaped jig can be inserted to assist in peeling off the four corners. In addition, in the box-shaped mold 1 according to the above-described embodiment, the material used does not have to be a recycled resin with good peelability.

In addition, the box-shaped formwork 1 in the above embodiment is lightweight, but does not deform even when concrete is poured, compacted, and transported. Regarding the box-shaped mold 1, since the specimen is not limited to a rectangle, for example, a mold for length, width and length of 10 × 10 × 10 cm, 10 × 10 × 40 cm, or 15 × 15 × 53 cm It is to lighten the frame.

A box-shaped formwork 1 for forming a specimen for a concrete strength test according to the present invention, wherein a side surface 3 and a bottom surface 4 are integrally formed of a synthetic resin into a box-like shape, and the outer periphery of the upper surface of the box-like shape. A flange portion 5 having a required width is formed in the formwork 1, 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 required intervals. In addition to being excellent in rigidity (strength), it does not require assembly work unlike conventional steel forms, and since there are no gaps like steel forms, concrete leakage does not occur, and it is lightweight. It is easy to carry around, has good workability, and can achieve a large cost reduction.

1 Mold 2 Opening 3 Side 3a Long side 3b Short side 4 Bottom 5 Flange 6 Rib 6a Rib provided on the long side 6b Rib provided on the short side 7, 8 A pair of V-shaped Notch groove
7a, 8a ends
9 small holes

Claims (2)

A box-shaped formwork for forming a concrete strength test specimen,
The sides and bottom are made of synthetic resin to form an integrally molded box shape,
A flange portion having a required width is 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 surfaces and the bottom surface ,
A pair of V-shaped cut grooves are provided at the four corners of the box-shaped outer side,
Each end of each cut groove is formed so that the cut groove is shallow.
A lightweight formwork for a concrete strength test specimen, characterized by: The lightweight formwork for a concrete strength test specimen according to claim 1, wherein the synthetic resin is a high-density polyethylene resin or polypropylene resin with good peelability.

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