JPH05332901A - Inspection method of specimen - Google Patents

Abstract

PURPOSE:To correctly inspect the compressive strength of concrete of a structure easily. CONSTITUTION:Immediately after a concrete 1 is supplied into a structural body, a cylinder 2 of a predetermined inner diameter is inserted into a position where a specimen is supposed to be obtained. A hollow part in the cylinder is filled with the concrete. Then, a notch 3 is provided outside the outer peripheral part of the inserted cylinder to take out a cylinder 4 to which the concrete adheres. After the cylinder is taken out, the adhering concrete and the cylinder are removed and, a concrete 6 as a specimen inside the cylinder is obtained. The concrete 6 is subjected to a compression test.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of inspecting a specimen for inspecting the compressive strength of structural concrete.

[0002]

2. Description of the Related Art Conventionally, as a method for inspecting the compressive strength of structural concrete, it has been stipulated that a core is cut from an actual structure and a compressive strength test is performed. Normal,
To cut the core, use a core drill for concrete, insert the inside of the structure while rotating the solid cutting edge provided at the tip of the core drill at high speed, form a concrete piece of a predetermined size, and A method of cutting and then performing a compression test is used.

[0003]

According to the conventional example, when the core is cut, the specimen is damaged during the cutting, the coarse aggregate is loosened from the concrete base material, and the adhesive strength is reduced. For reasons, it is often not possible to accurately inspect the compressive strength of structures. The problem is particularly great when using high-strength concrete.

An object of the present invention is to easily and accurately inspect the compressive strength of a concrete structure.

[0005]

According to the present invention, concrete is first poured into a structure, and then a cylinder having an inner diameter of a predetermined size is inserted into a specimen cutting planned position before the concrete is hardened. , Filling the hollow part in the cylinder with concrete, and then inserting a notch on the outside of the outer peripheral part of the inserted cylinder, cutting out the cylinder with concrete adhered to the outer peripheral part, and concrete adhering after cutting out and The cylinder is removed, the concrete to be the specimen inside the cylinder is taken out, and the compression test is performed.

[0006]

[Function] The specimen can be taken out from the cylindrical body in a complete form, and the compression accuracy is improved.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1 (a), immediately after the concrete 1 is cast into the structure, chloride having an inner diameter three times or more of the maximum size of the coarse aggregate is placed at the planned cutting position of the concrete specimen. The cylinder 2 made of vinyl is inserted, and the hollow part in the cylinder is filled with concrete. Then, Figure 1
As shown in (b), a notch 3 is made in the outer peripheral portion of the inserted cylinder 2 to make a cut, and as shown in FIG. 1 (c),
A concrete-attached cylinder 4 having concrete attached to the outer periphery is cut out. After that, the concrete adhering cylinder 4 is cut in the lengthwise direction by using a cutting means such as a diamond cutter to insert the cutting line 5 to remove the adhering concrete and the cylinder 2, and as shown in FIG. Then, the concrete 6 to be the specimen inside the cylinder is taken out. Then, a compressive strength test is performed on the concrete 6 taken out from the inside of the cylinder 2, and this is used as the compressive strength of the structural concrete.

As another example of the cylinder, as shown in FIG. 2, the cylinder 12 may be composed of two half-split tubes 12a, and both half-split tubes may be joined by an adhesive tape. According to this example, the sample 6 can be taken out and the compression test can be performed without using a special cutting means such as a diamond cutter, and the sample 6 is not damaged.

The cylindrical body is not limited to a cylinder.

[0011]

According to the present invention, the specimen can be taken out from the cylindrical body, and the specimen is not directly cut out by a drill or the like as in the conventional case, so that the specimen is not damaged and the coarse aggregate is not loosened. It is possible to easily obtain test results close to the compressive strength of the actual structure.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing steps of an embodiment of the present invention.

FIG. 2 is an enlarged plan view showing another embodiment and usage example of the cylinder of the present invention.

[Explanation of symbols]

 1 Concrete 2 Tube (Cylinder) 3 Notch 4 Concrete Attached Cylinder 6 Specimen (Concrete) 12 Tube (Cylinder)

Claims (1)

[Claims] 1. After pouring concrete into the structure,
Before this concrete hardens, insert a cylinder with an inner diameter of a predetermined size into the intended cutting position of the specimen, fill the hollow part in the cylinder with concrete, and then make a notch on the outside of the outer periphery of the inserted cylinder Then, cut out the cylinder with concrete adhered to the outer circumference, remove the adhered concrete and the cylinder after cutting out, take out the concrete as the sample inside the cylinder, and perform a compression test on it. A method for inspecting a specimen, which is characterized in that