JP2001174454A - Method of measuring neutralization of concrete, and concrete powder-gathering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relate the progress of the degree of drilling of a hole to the depth of the hole of discharged concrete powder by forming the hole in a concrete by a drill when measuring the neutralization of the concrete. SOLUTION: The concrete powder gathering device A is composed of a drilling device B with a drill 11 for forming a hole 2 in the depth direction of concrete 1, a sticking device C with a sticking member 21 of continuous length being arranged near the drill 11, and a traveling mechanism 22 for transferring the sticking member 21 in one direction along with the move in a direction for approaching the concrete of the drilling device B. A powder-gathering tool 23 is arranged between the drill 11 and the sticking member 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the depth of carbonation of concrete, which is one of the indexes for evaluating the durability of a concrete structure, and an advantageous method for use in carrying out this method. The present invention relates to a concrete powder sampling device.

[0002]

2. Description of the Related Art Concrete exhibits alkalinity at the time of molding, and loses alkalinity due to the action of carbon dioxide and the like in the air with time and becomes neutral. When concrete is neutralized, it loses the rust-preventing effect on the reinforcing steel, and the corrosion of the reinforcing steel progresses, losing necessary strength, and at the same time, expanding and destroying the concrete, leading to collapse of the concrete structure.

[0003] For concrete structures, therefore, it is extremely important to measure the depth of carbonation of concrete in order to grasp the durability. To grasp the durability of the concrete structure, it is necessary to measure the depth of concrete. The depth of the neutralization is measured, and as a result, whether or not the neutralization depth has reached the rebar and how close the rebar is to the neutralized portion is used as one of the evaluation methods.

[0004] When measuring the neutralization depth of such concrete, the concrete is generally placed at a diameter of 3 cm to a diameter of 3 cm.
A 10 cm core was withdrawn, and the neutralization depth was measured using a reagent such as phenolphthalein for the core. However, in this method, the core is removed from a part of the building, and the concrete structure is damaged.

[0005] In particular, when a precise investigation is required,
Cores are removed from multiple parts of the building, resulting in a weakened structural strength. Furthermore, the part where the beam and the column intersect,
The core cannot be substantially removed from structurally important parts such as the central part of the beam and the root part of the column. In addition, there is a possibility that the main rebar may be cut structurally when the core is removed, and in this case, there is a problem that the building may be fatally damaged.

In order to solve the above problem, as a method for measuring the neutralization of concrete while minimizing the effect on concrete structures, concrete is drilled with a drill, and the alkalinity of concrete powder discharged at this time is measured. A method for estimating the neutralization depth by using the method has been proposed.

[0007]

According to the method for estimating the neutralization depth by the concrete powder discharged when drilling concrete by the drill as described above, the position of the concrete powder in the depth direction in the concrete ( It is necessary that the depth dimension) can be measured accurately. However, it is extremely difficult to make the concrete powder continuously discharged from the hole formed when the drilling operation is continued, correspond to the depth of the hole.

For this reason, the drill is stopped every time a predetermined depth is drilled, the drill is stopped, and the operation of collecting the concrete powder adhered to the drill is performed, whereby the position of the collected concrete powder in the depth direction of the concrete is performed. Has been identified. By this method, the depth of concrete is reduced to several mm.
When measuring in units, there is a problem that it takes an extremely long time. This method has a problem that it is extremely difficult to collect concrete powder adhering to the drill in the case of wind or rainy weather, which is practically impossible.

An object of the present invention is to form a hole in concrete by drilling, and measure the neutralization by relating the degree of piercing of the hole to the depth of the discharged concrete powder in the hole. An object of the present invention is to provide a method for measuring carbonation of concrete and an apparatus for collecting concrete powder.

[0010]

According to the present invention, there is provided a method for measuring the neutralization of concrete according to the present invention, comprising detecting the alkalinity of concrete powder discharged when a depthwise hole is formed in concrete. A method of measuring the neutralization depth by placing a sticking member near the lower side of the hole formed in the concrete, with the progress of the degree of piercing in the depth direction of the hole formed in the concrete. The method is characterized in that the adhering member is continuously moved to collect the falling concrete powder, and the alkalinity of the collected concrete powder is detected.

In the method for measuring carbonation of concrete (hereinafter simply referred to as "measurement method"), an adhesive member disposed below a hole formed in concrete is moved with the progress of the degree of piercing of the hole. By collecting the concrete powder dropped from the hole in this process, the concrete powder discharged according to the depth of the hole is continuously attached to the attaching member. For this reason, the concrete powder stuck on the sticking member corresponds to the depth of the hole formed in the concrete. Therefore, by measuring the alkalinity of the concrete powder stuck to the sticking member, the depth of neutralization in the target concrete can be measured.

In the above measuring method, between the hole formed in the concrete and the sticking member disposed near the lower side of the hole, the side facing the hole is open and the side facing the sticking member is narrow. It is preferable to dispose a powder tool, collect the concrete powder discharged along with the growth of the hole formed in the concrete by the powder collector, and drop the powder on the sticking member.

[0013] The concrete powder collecting apparatus according to the present invention includes a drilling apparatus having a drill for forming a hole in the depth direction in concrete, a long sticking member arranged near the drill, and And a transfer member for transferring the sticking member in one direction as the drill moves in the depth direction of the concrete.

In the above-mentioned concrete powder collecting apparatus (hereinafter simply referred to as "collecting apparatus"), when a hole is formed in the concrete in the depth direction by a drill, the sticking member is moved by the transfer member in accordance with the progress of the degree of piercing of the hole. Is transferred in one direction, whereby the concrete powder discharged from the hole can be continuously adhered. For this reason, the sticking position of the concrete powder on the sticking member can be associated with the depth of the hole.

Therefore, it is possible to replace the depth of the hole with the length of the concrete powder stuck to the sticking member,
The neutralization depth of concrete can be measured by measuring the alkalinity of the adhered concrete powder.

In the above-mentioned collecting apparatus, it is preferable to arrange a dust collecting tool between the drill and the attaching member constituting the drilling device, the side facing the drill being open and the side facing the attaching member being narrow. By configuring the sampling device in this way, it is possible to reliably sample the concrete powder discharged from the hole even in the case of wind or rain.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the above-mentioned sampling apparatus will be described below, and the measurement method will be described together. FIG. 1 is a perspective view showing a state of collecting concrete powder. FIG. 2 is a plan view illustrating an initial state when a hole is formed in concrete. FIG. 3 is a view for explaining the relationship among the drill, the dust collecting device, and the sticking member, and is a view taken along the line III-III in FIG. FIG. 4 is a diagram for explaining the progress of the hole piercing degree. FIG. 5 is a diagram illustrating a state in which the degree of piercing of the hole has progressed and has reached substantially the center in the depth direction of the concrete.

In the measuring method according to the present embodiment, the concrete powder generated by forming a hole in the concrete is discharged to the outside, and the discharged concrete powder is attached to a continuously moving sticking member. It is to measure the neutralization depth of the target concrete by associating the formation depth of the holes, that is, the depth of the concrete and the sticking position of the concrete powder, and measuring the alkalinity of the sticked concrete powder. is there. Therefore, the sticking member may be any member that can move with the progress of the degree of piercing of the hole formed in the concrete and can surely stick the concrete powder discharged from the hole. Not something.

First, the configuration of the sampling device A will be described with reference to FIG. The sampling device A includes a perforation device B for forming a hole 2 in the concrete 1 and a sticking device C for sticking concrete powder discharged from the hole 2.

The concrete 1 is a concrete for which the neutralization depth is to be measured, and whether the concrete 1 is a panel forming the outer wall of a building or a concrete structure forming a foundation, a barrier or the like. Don't ask.

The drilling device B is not limited as long as it can continuously discharge concrete powder, which is waste generated during cutting, while forming the holes 2 in the concrete 1, and the structure is not limited. As an example of such a punching device B,
There is a configuration in which a drill 11 provided with a cutting blade at the tip and having a twist groove continuous with the cutting blade at an outer peripheral portion is mounted on a chuck 13 rotatably disposed on a main body 12.

In the drilling device B, when the cutting edge at the tip of the drill 11 is pressed against the concrete 1 and rotated, the concrete 1 is cut with the rotation, and the generated concrete powder is passed through a groove provided on the outer periphery. And send it backwards to discharge.
Therefore, the concrete powder can be reliably and continuously discharged with the growth of the hole 2.

The sticking apparatus C sticks and moves the concrete powder discharged from the hole 2 with the progress of the degree of piercing of the hole 2 to move the depth of the hole 2 and the sticking position of the concrete powder. It is something to associate. For this reason, the adhering device C includes an adhering member 21 for spotting concrete powder, a moving mechanism 22 for moving the adhering member 21 in one direction as the degree of piercing of the hole 2 progresses, It is configured to include a dust collecting tool 23 that collects the discharged concrete powder and reliably transfers the concrete powder to the sticking member 21, and a frame 24 that holds the respective constituent members in a fixed relationship.

The adhering member 21 is not particularly limited as long as it has a function of adhering the concrete powder continuously. As shown in FIG.
As the sticking member 21, a long tape with an adhesive surface exposed is used. However, the shape is not necessarily required to be a tape shape, and may be a disk shape. When the sticking member 21 is formed in a disc shape, it is effective when the depth of the hole to be formed is small, or it is also effective to move the sticking member 21 in a spiral shape.

In this embodiment, the sticking member 21 is formed in advance as a roll 21a, and the roll 21a is
It is rotatably attached to a support part 26 of a guide shaft 25 provided in 24. The sticking member 21 is rewound from the roll 21a,
The end is wound around a reel 28 driven by a screw shaft 27 rotatably provided on the frame 24.

The reel 28 is configured to be detachable from the screw shaft 27, and when mounted, is substantially integrated with the screw shaft 27 and rotates together with the screw shaft 27. When detached, the sticking member 21 can be detached from the reel 28.

The moving mechanism 22 has a function of moving the sticking member 21 as the degree of piercing of the hole 2 in the concrete 1 progresses. As a device having such a function, for example, the degree of piercing of the hole 2, that is, the main body 12 of the piercing device B is used.
Of the body 1 approaching the concrete 1 by detecting the approach to the concrete 1 and driving a motor or the like in accordance with the detection result to move the sticking member 21. Sticking member 21 in conjunction with the
There are various mechanisms such as a mechanical mechanism for moving the moving object, and what kind of mechanism is employed is a matter of design.

In the present embodiment, the moving mechanism 22 is
Guide shaft 25 and screw shaft 27 provided in the guide hole, guide hole 29 and screw shaft 27 that slidably pass through guide shaft 25 and guide the sliding direction
And a main body of the drilling device B.
It comprises an attachment 31 fixed to 12.

In the above configuration, when the screw shaft 27 is screwed into the screw portion 30 of the attachment 31 and the screw shaft 27 is immovable in the axial direction, and when the main body 12 is brought close to the concrete 1 in this state, the attachment The linear motion of 31 is converted into a rotational motion by screwing the screw portion 30 and the screw shaft 27,
Thereby, it is possible to rotate the reel 28 and move the sticking member 21 wound around the reel 28 in the direction of the arrow.

In FIG. 1, reference numeral 32 denotes a handle for securely holding the main body 12 when the hole 2 is formed in the concrete 1. In FIG. 2, reference numeral 33 denotes a conical projection, which bites into the concrete 1 to reliably hold the position.

Next, a procedure for forming the hole 2 in the concrete 1 and collecting the concrete powder discharged from the hole 2 by the sampling apparatus A configured as described above will be described.

The roll 21a is attached to the support portion 26 in advance, and the sticking member 21 is rewound and wound around the reel 28. Then, as shown in FIG. The mounting position of the sampling device A is held by contact. At this time, the tip of the drill 11 is set at a position in contact with or slightly separated from the surface of the concrete 1. This setting is for the chuck 13 of the drill 11
It is sufficient to adjust the mounting position with respect to.

Next, the drilling device B is driven to rotate the drill 11, and the drilling device B is moved closer to the concrete 1 as shown in FIG. 4, and the drill 11 cuts the concrete 1 to form a hole 2. . The concrete powder generated from the cutting edge of the drill 11 as the hole 2 is formed and the degree of piercing of the hole 2 progresses is continuously sent to the surface side of the concrete 1 and discharged from the formed hole.

The discharged concrete powder is collected by a dust collector 23, falls through the gap formed below the dust collector 23 onto the sticking member 21, and is continuously stuck. At this time, since the concrete powder is discharged along the groove of the drill 11, the concrete powder can be transported to above the sticking member 21 without the dust collector 23. However, the certainty of transportation is low, and particularly in the case of wind or rain, there is a possibility that the material may fall or be blown off before reaching the attaching member 21.
Preferably, 23 is provided.

The force that causes the drilling device B to approach the concrete 1 when forming the hole 2 is applied through the body 12 to the attachment.
The screw shaft 27 is rotated by being screwed into the screw portion 30 and the screw shaft 27. The reel 28 rotates with the rotation of the screw shaft 27, and moves the sticking member 21 in the direction of the arrow.

Therefore, the movement of the drilling device B in the direction of the concrete 1 (the progress of the degree of piercing of the hole 2) and the movement of the sticking member 21 in the direction of the arrow are proportional, and the depth of the hole 2 and the sticking member 21 are Can be associated with the amount of movement. That is,
By measuring the sticking position of the concrete powder on the sticking member 21, it is possible to know from what depth of the hole the concrete powder has been discharged.

A nozzle (not shown) for dropping a reagent (phenolphthalein) for measuring alkalinity is provided in the vicinity of the dust collector 23 and downstream in the moving direction of the attaching member 21. Adhering member by dropping reagent continuously
It is possible to measure the alkalinity of the concrete powder attached to 21. When the concrete powder is measured to be neutral, it is possible to know the depth of the hole 2 by measuring the distance on the sticking member 21. It is possible to measure the depth.

In particular, when the concrete 1 to be measured is a panel, the neutralization depth is promoted from both sides. Therefore, as shown in FIG. 5, when the hole 2 reaches a position deeper than １ ／ of the panel, the measurement for the panel can be completed.

In the present embodiment, the sticking member 21 is formed in a tape shape, but may be a plate-like body depending on the depth of the hole 2. The sticking member 21 does not necessarily have to have an adhesive property, and may be a member to which a cloth or paper is temporarily provided with a sticking property by immersing it in water.

It is preferable that the adhering member 21 is impregnated with a reagent in advance. When such an adhering member is used, the alkalinity is measured at the same time as the concrete powder is adhered to the adhering member. It becomes possible.

In carrying out the measuring method, the mechanism for collecting the concrete powder is not particularly limited, and a suction device is attached to a tool for piercing the concrete, and the concrete powder is attached to a sticking member. May be.

[0042]

As described in detail above, in the measuring method according to the present invention, it is possible to associate the depth of the hole formed in the concrete with the position of the collected concrete powder, and the concrete powder adhered to the sticking member. The neutralization depth of concrete can be easily measured by measuring the alkalinity of concrete.

Further, by providing the dust collecting device, the concrete powder discharged from the hole formed in the concrete can be reliably collected and adhered to the attaching member regardless of the presence or absence of wind or rainy weather.

Further, in the sampling apparatus according to the present invention, it is possible to measure the neutralization by forming a hole in the concrete with a drill. For this reason, the device can be miniaturized to the extent that it can be manually operated, and the neutralization of concrete can be measured easily and without limiting the place.

As described above, since the neutralization of concrete can be measured by a simple operation, it becomes easy to evaluate the durability of the building or the foundation of the building. Therefore, it is possible to appropriately perform maintenance on the concrete, and it is possible to extend the service life of the building and improve the economic efficiency.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state of collecting concrete powder.

FIG. 2 is a plan view illustrating an initial state when a hole is formed in concrete.

FIG. 3 is a view for explaining a relationship among a drill, a dust collecting device, and an attaching member, and is a view taken along the line III-III in FIG. 2;

FIG. 4 is a diagram illustrating a progress process of a hole piercing degree.

FIG. 5 is a diagram illustrating a state in which the degree of piercing of a hole has progressed and has reached substantially the center in the depth direction of concrete.

[Explanation of symbols]

 Reference Signs List A sampling device B drilling device C sticking device 1 concrete 2 hole 11 drill 12 body 13 chuck 21 sticking member 21a roll 22 moving mechanism 23 dust collector 24 frame 25 guide shaft 26 support part 27 screw shaft 28 reel 29 guide hole 30 Screw part 31 Attachment 32 Handle 33 Projection

Claims (4)

[Claims] 1. A method for measuring the neutralization depth by detecting the alkalinity of concrete powder discharged when forming a depth-wise hole in concrete, comprising: The adhesive member is disposed on the concrete member, and the concrete powder is dropped by continuously moving the adhesive member with the progress of the degree of piercing in the depth direction of the hole formed in the concrete. A method for measuring carbonation of concrete, comprising detecting alkalinity of powder. 2. A dust collector is provided between a hole formed in concrete and a sticking member arranged near the lower side of the hole, the dust collector being open on the side facing the hole and narrow on the side facing the sticking member. 2. The method for measuring carbonation of concrete according to claim 1, wherein the concrete powder discharged along with the growth of the hole formed in the concrete by the dust collecting tool is collected and dropped on a sticking member. 3. A drilling device having a drill for forming a hole in a depth direction in concrete, a long sticking member arranged in the vicinity of the drill, and a drill in the depth direction of the concrete. And a transfer member for transferring the sticking member in one direction as it moves. 4. A dust collector, wherein a side facing the drill is open and a side facing the attaching member is narrow, is disposed between the drill and the attaching member constituting the drilling device.
Concrete powder sampling device described in 1.