JP3061592B2 - How to collect concrete specimens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for collecting a concrete specimen for measuring the strength of a concrete structure.

[0002]

2. Description of the Related Art Conventionally, concrete specimens are collected by the following method. First, as shown in FIG. 8, a projecting part, that is, a specimen 3 is formed in an opening of a mold 2 of a concrete structure 1 with a separate mold 2a, and the specimen 3 and the structure 1 are connected to each other. A slit material 4 made of foamed polyurethane and a slit reinforcing plate 5 made of steel are embedded in advance in a part of the boundary position.

[0005] Incidentally, reference numeral 4 a in FIG. 8 denotes a screw for fixing the slit member 4 and the slit reinforcing plate 5,
Reference numerals 4b and 5a in FIGS. 9 and 10 indicate small holes into which the screws 4a are screwed.

[0004] Next, after removing the molds 2 and 2a and the screw 4a, the slit member 4 and the slit reinforcing plate 5 are forcibly pulled out using various jigs such as chisel or pliers. As shown in FIG. 11, a slit portion 6 is formed at a boundary position between the specimen 3 and the structure 1.

[0005] Thereafter, the insertion piece 8 of the sampling device 7 as shown in FIG. 12 is inserted into the slit section 6 and the sampling device 7 is set. When the push bolt 9 is rotated in the direction of arrow A with a wrench 10, the push bolt 9 is screwed in the direction of arrow B, and a tensile force is applied to the insertion piece 8 in the direction of arrow C. As a result, the test piece 3 From the concrete structure 1.

[0006]

In the conventional method of collecting a concrete specimen, the slit member 4 and the slit reinforcing plate 5 adhere to the concrete structure 1 as the concrete hardens. Therefore, there is a problem that it is difficult and troublesome to take out the slit member 4 and the like, and it takes time.

Further, since the slit material 4 and the slit reinforcing plate 5 taken out are deformed or broken during the taking-out work, they have a disadvantage that they cannot be reused and are uneconomical.

[0008] Furthermore, when the specimen 3 is collected, there is a disadvantage that two persons, an operator who operates the sampling device 7 and an operator who holds the specimen 3 so as not to drop, are required. .

Therefore, in the conventional method of collecting a concrete specimen, the work is performed easily and in a short time to improve the workability, the slit material can be reused, and a plurality of works are performed. There is a problem that must be solved so that no one is required.

[0010]

SUMMARY OF THE INVENTION As a specific means for solving the problems of the prior art, the present invention relates to a method for forming a specimen for forming a specimen outwardly from a part of a concrete formwork. A frame is formed so as to protrude, and a slit plate having a screw hole is provided at a part of a boundary position between the concrete form and the specimen forming mold, and concrete is poured into the both forms. After forming the specimen together with the concrete structure, and after hardening the concrete, the both molds are removed, and then a bolt is forcibly screwed into the screw hole of the slit plate to apply a tensile force to the slit plate, thereby providing the specimen with the tensile force. It is intended to provide a method for collecting a concrete specimen, which is characterized in that the specimen is cut off.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. First, as shown in FIG. 1, an opening 12 is formed in a part of a concrete form 11, and a protruding portion, that is, a concrete specimen forming form 13 is formed outside the opening 12.

A screw hole 14 is provided at a part of the boundary between the concrete form 11 and the specimen forming form 13.
A slit plate 15 having a fixing screw hole 14b is provided, and a screw 14c is screwed into the fixing screw hole 14b to fix the slit plate 15. In this manner, the slit plate 15 can be easily attached to or detached from the concrete specimen forming mold 13 and can be easily set on the mold.

The slit plate 15 is disposed at a position such that the screw hole 14 is located on the concrete form 11 side.
That is, it is necessary to prevent the test piece from being positioned inside the molding frame 13. In other words, this is to prevent the screw hole 14 from being buried in the specimen by the concrete that has been cast later.

Further, it is necessary to cover the both sides of the screw hole 14 with vinyl tape or the like so that the poured concrete does not enter (not shown).

The slit plate 15 is formed of, for example, a steel plate, and as shown in FIGS. 2A, 2B, 2C, and 2D,
Although it has a predetermined width, height and thickness, it is preferable that the width of the slit plate 15 is slightly longer than the width of the specimen to be formed.

Further, the end of the slit plate 15 is shown in FIG.
(B) As shown in (c) and (d), it is desirable to form a chamfered portion 15b for preventing concrete peeling.
By forming in this manner, it is possible to prevent the surface of the concrete structure 16 from cracking when the specimen 17 to be described later is broken off.

Although the illustrated slit plate 15 is provided with two screw holes 14, the number of screw holes 14 is not limited to two but may be one or three or more.

Next, concrete is poured into the concrete mold 11 and the specimen forming mold 13 to form the specimen 17 together with the concrete structure 16 as shown in FIG.

After the concrete is hardened, the screws 14c are removed, and the concrete form 11 and the test piece forming form 1 are removed.
3 is removed (see FIGS. 4 and 5).

Thereafter, as shown in FIG.
The bolt 18 is screwed into each of the screw holes 14 of FIG. 5, the wrench 19 is rotated in the direction of arrow D, and the bolt 18 is forcibly screwed in the direction of arrow E.

Then, as shown in FIG. 7, a tensile force in the direction of arrow F is applied to the slit plate 15 to
From the concrete structure 16. As described above, since the chamfered portion 15b for preventing concrete peeling is formed at the end of the slit plate 15, cracking of the surface 16a of the concrete structure 16 can be prevented.

[0022]

As described above, in the method for collecting a concrete specimen according to the present invention, an opening is formed in a part of a concrete form, and a specimen forming mold is projected outward from the opening. While forming, a slit plate having a screw hole is provided at a part of a boundary position between the concrete formwork and the specimen forming formwork, and concrete is poured into the both formworks to form a concrete structure. A specimen is formed together with the object, and after the concrete is hardened, the two molds are removed, and then a bolt is forcibly screwed into a screw hole of the slit plate to apply a tensile force to the slit plate, and the specimen is folded. By taking, it is not necessary to forcibly pull out the slit material and the slit reinforcing plate using various jigs as in the conventional example. Improvement That. Further, by screwing the slit plate to the specimen forming mold, it is possible to easily attach or detach the slit plate, and to achieve an excellent effect that the setting to the mold can be easily performed.

Further, since the slit plate is not deformed or damaged, the slit plate can be reused, and there is an excellent effect that the working cost can be reduced.

[0024] Since there is no need for a sampling device as in the conventional example, various excellent effects can be obtained in that the operator can perform the sampling operation by himself.

Furthermore, since a tensile force is applied to the slit plate itself instead of applying a tensile force using the insertion piece as in the conventional example, a large slit plate can be formed for concrete having a high tensile strength. It has various excellent effects such that design changes such as good can be easily performed, and specimens can be easily collected according to various concrete strengths.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a concrete mold and a specimen molding mold.

FIG. 2A is a front view of a slit plate. (B) It is sectional drawing on the II line of (A). (C) It is the II-II sectional view taken on the line (a). (D) A bottom view of the slit plate.

FIG. 3 is a cross-sectional view showing a state where concrete is poured into a concrete formwork and a specimen forming formwork.

FIG. 4 is a cross-sectional view showing a concrete structure and a specimen in a state where a concrete mold and a specimen molding mold are removed.

FIG. 5 is a perspective view showing a concrete structure and a specimen in a state where a concrete form and a specimen forming mold are removed.

FIG. 6 is a sectional view showing a state where a bolt is screwed into a screw hole of a slit plate.

FIG. 7 is a cross-sectional view showing a state where a specimen is cut off from a concrete structure.

FIG. 8 is a cross-sectional view illustrating a method for collecting a concrete specimen according to a conventional example.

FIG. 9A is a front view of a slit member. (B) A side view of the slit material is shown.

FIG. 10A is a front view of a slit reinforcing plate. (B) A side view of a slit reinforcing plate is shown.

FIG. 11 is a cross-sectional view illustrating a method of collecting a concrete specimen according to a conventional example.

FIG. 12 is a cross-sectional view illustrating a method for collecting a concrete specimen according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete structure 2 Form frame 2a Form frame 3 Specimen 4 Slit material 4a Screw 4b Small hole 5 Slit reinforcing plate 5a Small hole 6 Slit part 7 Sampling device 8 Insert piece 9 Push bolt 10 Wrench 11 Concrete form 12 Opening 13 Concrete specimen molding formwork 14 Screw hole 14b Fixing screw hole 14c screw 15 Slit plate 15b Chamfer for concrete peeling prevention 16 Concrete structure 16a surface 17 Specimen 18 Bolt 19 wrench

Continued on the front page (72) Inventor Toshiro Itaya 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Munehiro Umemoto 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72 ) Inventor Kazuhisa Shirayama 3-5-20 Daida, Setagaya-ku, Tokyo (56) References Japanese Utility Model Application Sho 61-138513 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01N 1 / 28 G01N 3/00

Claims (1)

(57) [Claims] An opening is formed in a part of a concrete form, and a specimen forming mold is formed to protrude outward from the opening, and the concrete form and the specimen forming form are connected to each other. A slit plate having a screw hole is arranged at a part of the boundary position, concrete is poured into the two formwork to form a specimen together with the concrete structure, and after the concrete is hardened, the two formwork are formed. A method for collecting a concrete specimen, comprising: removing a specimen, forcibly screwing a bolt into a screw hole of the slit plate to apply a tensile force to the slit plate, and breaking the specimen.