JPH07104339B2 - Concrete deterioration inspection method and inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is applied, for example, to a case where a repair method or the like is determined by measuring a progressing state of deterioration due to neutralization of a cleat surface layer in an existing concrete structure or the like. The present invention relates to a concrete deterioration inspection method and inspection apparatus.

[Conventional technology]

Inspect the progress of deterioration of the structure by measuring the depth (thickness) from the concrete surface to which the neutralization of the concrete surface layer, which greatly affects the durability of the existing concrete structure, progresses. In the case of doing, conventionally, for example, it is performed as follows.

That is, an example thereof is shown in FIG. 3, and as shown in FIG. 3A, a so-called core drill 31 having a relatively large diameter cylindrical bit 32 is conventionally used. The drill 31 is supported by a drill support member 34 attached to a concrete wall surface W or the like with an anchor 33 or the like so as to be able to move forward and backward, and the wall surface W is circularly cut by a cylindrical bit 32 of the drill 31 to extract a cylindrical core C. . The sampling depth should be slightly deeper than the thickness expected to be neutralized. If the diameter of the core C to be extracted is too small, the peripheral surface will be roughened or broken, so that the diameter is relatively large, generally about 50 mm.

Next, a phenolphthalene solution is sprayed onto the peripheral surface of the extracted columnar core C by a sprayer 3 or the like as shown in FIG. 2B, and calipers 36 or the like as shown in FIG. The thickness of the neutralized part that did not show a dyeing reaction is measured. The hole h1 after the core C is removed
The anchor mounting hole h2 is repaired by filling the mortar M with a trowel 37 or the like as shown in FIG.

[Problems to be Solved by the Invention]

However, when the core drill is used as in the above-mentioned conventional method, it is necessary to fix the drill support member to the wall surface W with an anchor or the like as described above, and to support the drill to perform the drilling work. It is efficient.

In addition, since the diameter of the perforations is large, the adverse effect on the existing structure is large and the number of inspection points cannot be increased. Moreover, vibration, noise,
There are problems such as disturbing the surrounding environment with dirty water, and conspicuous repair marks after the inspection.

Further, in the case where tiles and the like are attached to the surface of the concrete structure, the tiles and the like have to be cracked and inspected, so that there is a problem that the subsequent repair work is very troublesome.

The present invention has been proposed in view of the above problems, and an object of the present invention is to provide an inspection method and an inspection apparatus capable of easily and quickly inspecting the progress of deterioration of concrete.

[Means for Solving the Problems]

In order to achieve the above object, the present invention has the following configurations.

That is, the method for inspecting deterioration of concrete according to the present invention comprises mounting a hollow bit on a drill for concrete drilling, and atomizing and mixing an alkaline inspection reagent such as a phenolphthalein solution from the bit tip through the hollow hole of the hollow bit. By piercing a small hole in the concrete while ejecting the compressed air, while adsorbing the inspection reagent to the cutting chips generated at the time of piercing, piercing the cutting chips adsorbed by the inspection reagent together with the compressed air The feature is that the neutralization depth of the concrete surface layer is measured by ejecting it from a small hole that exists and changing the dyeing reaction by the alkaline test reagent adsorbed to the chips.

Further, the concrete deterioration inspection apparatus according to the present invention comprises a hollow bit, and a drill for concrete drilling having a fluid supply port communicating with the hollow part, and a hollow part of the hollow bit through the fluid supply port of the drill. A compressed air supply source for supplying compressed air to the, and an atomizer for atomizing and mixing an alkaline test reagent such as a phenolphthalein solution into the compressed air supplied from the compressed air supply source into the hollow bit. It is characterized by having.

[Work]

According to the above-described inspection method of the present invention, compressed air in which an alkaline inspection reagent such as a phenolphthalein solution is atomized and mixed is perforated while supplying the air into the hollow bit of the drill, and when the perforation is performed, the cutting powder is cut. The neutralization depth of the concrete can be investigated by stopping the drilling work when the color of the cutting chips changes due to the staining reaction with the alkaline test reagent mixed in the, and measuring the drilling depth at that time.

Further, the inspection device according to the present invention comprises a drill for concrete drilling, in which a hollow bit is mounted as described above, a compressed air supply source for supplying compressed air into the hollow bit, and an alkaline inspection reagent atomized in the compressed air. With a simple structure that only includes an atomizer that mixes in as a result, it becomes possible to perform a neutralization depth of concrete, that is, a deterioration test.

〔Example〕

Hereinafter, a concrete deterioration inspection method and inspection apparatus according to the present invention will be specifically described based on the embodiments shown in the drawings.

FIG. 1 is an explanatory view showing an embodiment of the concrete deterioration inspection apparatus according to the present invention.

In the figure, 1 is a concrete drilling drill, and a so-called non-core drill having a small diameter hollow bit 2 at its tip is used.

The drill 1 has a structure in which a motor 3 built in the main body thereof drives a 2 bit 2 to rotate, and an output shaft 4 of the motor 3 and a bit mounting shaft 5 are arranged separately from each other with their axes shifted. Rotational force is transmitted from the gear 4a formed integrally with the output shaft 4 to the bit mounting shaft 5 via the gear 6 meshing with the gear 4a. Reference numeral 7 indicates an operation switch of the drill 1, and 8 indicates a power cord.

The bit mounting shaft 5 is formed in a tubular shape, one end side of which is connected to the fluid supply port 10 through the air-tight and water-tight fluid passage 9, and the other end of which the hollow bit 2 is detachably mounted by the chuck 11. ing. Reference numeral 12 is an opening / closing valve provided in the fluid supply port.

The fluid supply port 10 is preferably provided on the tip side of the motor 3 as in the illustrated example. Since it is a drill that pierces concrete, even if the water flow passage is completely cut off during manufacturing, the water blocking packing, etc. may become loose depending on how the operator handles it. This is to prevent water from entering inside as much as possible.

In the present embodiment, the bit 2 has a structure in which a powder sintered metal containing diamond grains is integrally provided at the tip of a hollow shank shaft 21, and a hollow hole is provided inside the shank shaft 21. 21a is provided over the entire length.

The outer diameter of the bit 2 is preferably as small as possible. Normally, about 5 to 6 mm is suitable. If the outer diameter is 10 mm or more, it is inconvenient to perforate the joint within the width of joints such as tiles.

In the figure, 13 is an air compressor as a compressed air supply source for supplying compressed air into the hollow bit 2 through the fluid supply port 10, and 14 is an atomizing agent for alkaline inspection in the compressed air supplied from the compressor 13. This is an atomizer to be mixed, and the atomizer 14 is connected between the compressor 13 and the drill 1 via pipes 15 and 16.

The alkaline test reagent L is housed in the lower container 14a of the atomizer 14, and the test reagent L is raised to the compressed air sent from the compressor 13 through the pipe 15 into the upper passage 14b of the atomizer. The compressed air mixed with the test reagent is sucked through the pipe 14c and atomized, and is introduced into the hollow bit 2 through the pipe 16, the fluid supply port 10, the passage 9 and the bit mounting shaft 5. Reference numeral 14d indicates an adjustment dial for adjusting the amount of the test reagent mixed with the compressed air.

Next, an example of the inspection method of the present invention will be described based on the above apparatus configuration example.

When starting the perforation on the wall surface W of an existing concrete structure or the like to be inspected, first, the alkali inspection reagent L is housed in the atomizer 14, the compressor 13 is operated, and the inspection reagent is adjusted by the adjustment dial 14d of the atomizer 14. Adjust the mixed amount of.
The pressure of the compressed air supplied by the compressor 13 is, eg, about 4 kg / cm ² . As the alkaline test reagent, for example, a 1% aqueous solution of phenolphthalein is used, and the mixing ratio with respect to the compressed air is appropriately adjusted.

In that state, press the operation switch 7 of the drill 1 to bit 2
Is started at about 7,000 to 12,000 rpm to start perforation of the concrete wall surface W to be inspected, and the perforation operation is performed only by rotation without giving a hit, and at the same time, it is sprayed from the tip of the drill. The compressed air containing the test reagent provides perforation while being cooled and lubricated.

The cutting powder at the time of punching becomes fine dust particles as shown in FIG. 2, and the test reagent ejected together with the compressed air from the tip of the bit is adsorbed to the dust and is sequentially discharged from the punched hole.

At that time, when the neutralized portion d of the concrete surface is being perforated, the color of the dust that has adsorbed the inspection reagent does not change, but when the perforation is further continued to reach a non-neutralized depth, the inspection is performed. The color of the dust adsorbing the reagent changes.
Therefore, it is possible to check the thickness of the neutralized concrete by stopping the drilling and measuring the drilling depth at that time.

The above-mentioned alkaline test reagent is not limited to phenolphthalein, and various other test reagents can be applied. Further, the device configuration is not limited to the illustrated example, and other appropriate configurations are possible.

〔The invention's effect〕

As described above, the method for inspecting deterioration of concrete according to the present invention can measure the neutralization depth only by drilling a small hole to a depth where the concrete is not neutralized, so the work is extremely simple. Inspection can be performed easily and quickly. Moreover, since the diameter of the perforations may be small, there is little risk of adversely affecting the existing concrete structure and the surrounding environment, and more inspection points can be provided to improve the measurement accuracy. Further, the repair work after the inspection is easy, and the repaired portion is not noticeable. Moreover, even if the concrete surface is tiled, the joint can be inspected, so there is no need to reattach the tile after the inspection.

Further, the concrete deterioration inspection apparatus according to the present invention comprises a drill for concrete drilling in which a hollow bit is mounted, a compressed air supply source for supplying compressed air into the hollow bit, and an alkaline inspection reagent in the compressed air in a mist form. Concrete neutralization depth, that is, deterioration inspection can be performed with an extremely simple structure that only includes an atomizer to be mixed, and a drill support member or an anchor that attaches it to a concrete wall surface is not necessarily required as in the conventional case. Since there is no need for the above, there is an effect that the device configuration is simple and can be manufactured at low cost, and the operation is easy.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a concrete deterioration inspection device according to the present invention, FIG. 2 is an enlarged view of a part of a state in which a drilling operation is performed for the inspection, and FIG. 3 is a conventional concrete It is explanatory drawing which shows the deterioration inspection point. 1 is a drill, 2 is a hollow bit, 13 is a compressed air supply source (air compressor), 14 is an atomizer, and W is a concrete wall surface.

Front Page Continuation (72) Inventor Tatsuro Fuse 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Koji Mitsui 1-35-4, Nakayukicho, Saiwai-ku, Kawasaki-shi, Kanagawa (72) Inventor Yasuhisa Kajiya 1251-708 Maeda, Hatogaya-shi, Saitama (56) References JP-A-63-243755 (JP, A)

Claims (2)

[Claims] 1. A hollow bit is attached to a drill for drilling concrete, and compressed air mixed with atomized alkaline test reagents such as phenolphthalein solution is ejected from the tip of the bit through the hollow hole of the hollow bit. While piercing small holes in the concrete, while adsorbing the inspection reagent to the cutting chips generated during the piercing, eject the cutting powder adsorbed by the inspection reagent from the small holes piercing with the compressed air, A concrete deterioration inspection method characterized by measuring the neutralization depth of a concrete surface layer portion by a change in a dyeing reaction by an alkali inspection reagent adsorbed to the cutting chips. 2. A concrete drill having a hollow bit and having a fluid supply port communicating with the hollow part, and compression for supplying compressed air into the hollow part of the hollow bit via the fluid supply port of the drill. A concrete deterioration inspection device comprising an air supply source and an atomizer for atomizing and mixing an alkaline inspection reagent such as a phenolphthalein solution into the compressed air supplied from the compressed air supply source into the hollow bit.