JP2007315842A - Method of collecting concrete sample, and drill cutter for collection - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method capable of facilitating sample collection and repair of a building body after sample collection, and a drill cutter for collection used for the method. <P>SOLUTION: The drill cutter 1 for collection has a hollow shape for crushing concrete in a circular range by screwing and allowing crushed refuge 12 to enter the inside, and has a collection port 6 opened from the hollow space to the outside. Each part of the target perforation depth of a concrete body 11 which is a sample collection object is perforated by the drill cutter 1 for collection. The treatment for perforating in this way and discharging the crushed refuge 12 in the drill cutter 1 for collection from the collection port 6 is repeated until reaching the target perforation depth, to thereby collect the concrete sample which is the crushed refuge 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a concrete sample collecting method for collecting a concrete sample from a wall or the like in order to determine deterioration of reinforced concrete such as a foundation or a wall, and a sampling drill used for the sampling method.

  As a method for judging deterioration of reinforced concrete such as foundations and walls, a sample of reinforced concrete is generally collected from a building frame and the neutralization of the sample is measured. In this case, a cylindrical core specimen having a diameter of 75 mmφ to 100 mmφ is drawn out from the building frame with a hollow drill, and is sampled as a reinforced concrete sample. A phenolphthalein aqueous solution is sprayed on the core specimen, and the core at that time The progress of neutralization is measured according to the discoloration of the specimen.

However, the above method has the following problems.
-Since a sample is collected by pulling out a core specimen having a diameter of 75 mmφ to 100 mmφ from the building frame, it is expensive to repair a large hole formed in the building frame by sampling.
・ Professional work is required to extract the core specimen from the building frame.・ There is a risk that the steel bars inside the building will be damaged at the same time.

  In the above method, if the hole that can be made in the building frame by sampling is small, the repair after sampling is easy, but for that purpose, the diameter of the core specimen pulled out with a hollow drill must be reduced to about 10 mmφ. Therefore, it is necessary to enhance the driving force of the hollow drill.

An object of the present invention is to provide a concrete sample collecting method that allows easy sample collection and repair of a building frame after sample collection.
Another object of the present invention is to provide a sampling drill for use in the method of the present invention.

  The concrete sample collecting method of the present invention uses a sampling drill cutter having a sampling port that has a hollow shape that crushes a circular range of concrete by screwing and allows debris to enter inside, and has a sampling port that opens to the outside from the hollow space. By repeating the process of drilling the concrete body to be sampled partly at the target drilling depth and discharging the scraps in the sampling drill cut from the sampling port to the target drilling depth, It is characterized by taking a concrete sample.

  According to this method, using a sampling drill cutting that crushes concrete and enters the swarf into the interior, repeats the process of drilling part of the target drilling depth and discharging the swarf in the sampling drill slicing. The sample can be taken by drilling to the required depth while making the hole to be opened in the concrete body as small as possible. Thus, since the cross-sectional defect for sample collection can be made as small as possible, the subsequent repair is simple and the repair cost is not high. In addition, since only small holes need to be drilled, drilling work is easy, there is little risk of damaging the reinforcing bars, etc., and no special work is required. For this reason, it is possible to measure the neutralization of concrete in a wide range of applications such as verification of second-hand houses. In addition, since concrete samples that are crushed chips are taken by drilling part of the target drilling depth, it becomes clear which depth position the sample is in the concrete body, depending on the depth position of the concrete body. Properties such as characterization can be verified.

In this invention, you may make it discharge | emit the debris from the collection port of the said sampling drill cutting by vacuum suction.
When the swarf is discharged by vacuum suction, the swarf can be easily and quickly discharged per part of the target drilling depth.

  In the present invention, the discharge of the swarf from the sampling port of the sampling drill cutter may be performed by gripping with a gripping member that is removably inserted into the hollow space. When discharging with the gripping member, unlike the vacuum suction, a large incidental facility such as a vacuum suction device is not required.

The concrete neutralization measurement method of the present invention is a method in which a concrete sample is collected using the concrete sample collection method of the present invention, and the degree of progress of neutralization of the collected concrete sample is measured with a working liquid.
According to this method, concrete neutralization measurement can be easily performed. In this case, if the concrete sample of each time in the process of repeating the drilling part by part is distinguished and measured with the working liquid, the progress of neutralization at some depth from the surface of the concrete body can be measured. it can.

The sampling drill cutting according to the present invention has a cylindrical shape having a cutting edge at the peripheral edge of the tip, and is provided at the base end of the drill cutting main body for crushing the concrete body by screwing and allowing the debris to enter the inside. A shank portion that can be attached to a chuck of a drilling device, a main body sampling port provided in the vicinity of the base end of the drill cutting main body, and an axial position where the main body sampling port is provided on the outer periphery of the drill cutting main body And an idler member that forms a sealed space that is rotatably attached to the body part sampling port, and a suction sampling port that is provided on the idler member and can be connected to a vacuum suction device.
According to the sampling drill cutting of this configuration, it is possible to easily collect a concrete sample, and it is also possible to easily perform a process of discharging crushed pieces one by one by vacuum suction.

In the sampling drill cutting according to the present invention, the sampling position regulating guide to be brought into contact with the surface of the concrete body may be attached to the outer periphery of the drill cutting main body so as to be removable or changeable in the axial mounting position. good.
When the above-mentioned sampling position regulating guide is provided, when the part is repeatedly drilled, it is only necessary to drill until the sampling position regulation guide hits the concrete body. The depth can be accurately and easily regulated.

The concrete sample collecting method of the present invention is a hollow drill shape that crushes a circular range of concrete by screwing and enters crushed debris into the interior, and uses a sampling drill cutter having a sampling port that opens to the outside from the hollow space, By repeating the process of drilling a concrete body to be sampled partly at a target perforation depth and discharging the debris in the sampling drill to the target perforation depth, Since a certain concrete sample is collected, the area of the cross-sectional defect can be reduced as much as possible, the sample collection and the repair of the building frame after the sample collection can be easily performed, and the repair cost can be reduced.
The concrete neutralization measurement method of the present invention is a method of collecting a concrete sample using the concrete sample collection method of the present invention and measuring the degree of neutralization of the collected concrete sample with a working liquid. The sexification measurement can be easily performed.
The sampling drill cutting according to the present invention has a cylindrical shape having a cutting edge at the peripheral edge of the tip, and is provided at the base end of the drill cutting main body for crushing the concrete body by screwing and allowing the debris to enter the inside. A shank portion that can be attached to a chuck of a drilling device, a main body sampling port provided in the vicinity of the base end of the drill cutting main body, and an axial position where the main body sampling port is provided on the outer periphery of the drill cutting main body It is provided with an idler member that is rotatably attached and forms a sealed space communicating with the main body sampling port, and a suction sampling port that is provided on the idler member and can be connected to a vacuum suction device. A concrete sample can be collected, and the process of discharging crushed pieces part by part can be easily performed by vacuum suction.

  A first embodiment of the present invention will be described with reference to FIGS. This concrete sample collecting method is a method of collecting a concrete sample from the concrete body 11 in order to determine the deterioration of the concrete body 11 such as the foundation or wall of the building frame, and is performed by using the sampling drill 1. The sampling drill cutter 1 is composed of a cylindrical drill cutter main body 2 having a cutting edge 3 at the peripheral edge of the tip, and a non-hollow member provided at the base end of the drill cutter main body 2 and attachable to the chuck 21 of the drill device 20. The shank part 4 to be provided. The drill cutting main body 2 is screwed by the rotational drive by the drill device 20 to crush the concrete body 11 and introduce the crushed debris into the inside. The diameter of the drill cutting body 2 is about 10 mmφ.

  FIG. 2 is an enlarged cross-sectional view of the sampling drill 1 for sampling. A main body sampling port 6 is provided in the vicinity of the base end of the drilling main body 2, and the idle member 5 is rotatably attached to the outer periphery of the drill cutting main body 2 at an axial position where the main body sampling port 6 is provided. It has been. Specifically, both ends of the idle member 5 are attached to the drilling body 2 by ring-shaped members 8 so as to be slidable, and the idle member 5 is hermetically sealed to the main body sampling port 6. A space is formed on the outer periphery of the drill cutting body 2. The idle member 5 is provided with a suction sampling port 9 for connecting the hose 10.

  The hose 10 is connected to the vacuum suction device 23 of FIG. 1, and a sample reservoir 24 is interposed in the suction path. The vacuum suction device 23 includes a suction blower or a vacuum pump. The sample reservoir 24 is provided with a filter (not shown) inside, and stores a concrete sample, which is crushed chips sucked together with air.

In FIG. 2, a sampling position regulating guide 7 to be brought into contact with the surface of the concrete body 11 is attached to the outer periphery of the drill cutting body 2 so that it can be attached or detached, or can be fixed by changing the axial mounting position. ing. The collection position regulating guide 7 is formed in a ring shape, and is fixed to the outer periphery of the drill cutting body 2 by a set screw (not shown) or the like. Marks (not shown) are attached to the outer peripheral surface of the drilling main body 2 at predetermined intervals in the axial direction, and the sampling position regulating guide 7 is fixed according to the marks. It should be noted that a plurality of sampling position regulating guides 7 may be attached to the drilling main body 2 at predetermined intervals in the axial direction and sequentially removed from the leading position sampling position regulating guide 7. The predetermined interval is, for example, in the range of 5 to 10 mm.
The axial length L from the tip of the drilling body 2 to the idle member 5 is not less than the depth of the concrete body 11 to be sampled, that is, not less than the width of the building frame.

  FIG. 3 shows the procedure of the concrete sample collecting method of this embodiment. In this concrete sample collecting method, the tip of the drill cutting body 2 is sampled as shown in FIG. 3 (A) with the sampling drill 1 attached to the chuck 21 of the drill device 20 (FIG. 1) with the shank 4. Press against the surface of the target concrete body 11. In this state, the drilling main body 2 is rotationally driven by the drill device 20. Thereby, the drill cutting main body 2 is screwed into the concrete body 11, and the concrete in the circular range is crushed by the cutting blade 3 at the tip, and the debris 12 enters the inside of the hollow drill cutting main body 2.

  At this time, the screwing of the drill cutting main body 2 is stopped at a position where the sampling position regulating guide 7 contacts the surface of the concrete body 11. For example, when the sampling position regulating guide 7 is attached at a position 5 mm (or 10 mm) from the tip of the drill cutting body 2, the drill cutting body 2 places the concrete body 11 into a partial dimension A of the target drilling depth A. It stops at the position where it is drilled to a depth of 5 mm (or 10 mm).

  Next, as shown in FIG. 3B, the vacuum suction device 23 (see FIG. 3) removes the swarf 12 in the drill cutting body 2 through the hose 10 connected to the suction sampling port 9 of the idle member 5 in the sampling drill cutting 1. Suction is performed in 1) and is discharged to the outside from the main body sampling port 6 and the suction sampling port 9. Since the idle member 5 is rotatably attached to the outer periphery of the drilling body 2, the drilling body 2 can be driven to rotate without any trouble even if the hose 10 is connected to the suction sampling port 9 of the idle member 5.

  The above steps are sequentially repeated while shifting the mounting position of the sampling position regulating guide 7 with respect to the drilling main body 2 by a predetermined interval (for example, 5 mm to 10 mm) until the drilling depth reaches the target depth. The target depth is, for example, a depth penetrating the concrete body 11 or a center depth of the concrete body. The hole drilled in the concrete body 11 is closed with mortar, a water stop material or the like. A phenolphthalein aqueous solution, which is a working liquid, is sprayed on the concrete sample that is the crushed chips 12 collected in this manner, and the degree of neutralization is measured according to the state of discoloration. In addition to neutralization, salinity measurement and fine powder measurement may be performed.

  According to this method, by using the sampling drill 1 for crushing concrete and entering the swarf into the interior, a part of the target drilling depth is drilled and the swarf in the sampling drill 1 is discharged. In order to repeat, the sample can be taken by drilling to the required depth while making the hole opened in the concrete body 11 as small as possible. For example, a hole with a diameter of about 10 mm is sufficient. Thus, since the cross-sectional defect for sample collection can be made as small as possible, the subsequent repair is simple and the repair cost is not high. In addition, since only small holes need to be drilled, drilling work is easy, there is little risk of damaging the reinforcing bars, etc., and no special work is required. For this reason, the neutralization etc. of the concrete body 11 can be measured in a wide range of applications such as verification of used houses. Furthermore, since the concrete sample which is a swarf is sampled by drilling part of the target drilling depth, it becomes clear which depth position the sample of the concrete body 11 is, and depending on the depth position of the concrete body 11 Different properties such as neutralization can be verified.

  Since the swarf is discharged from the sampling drill 1 by vacuum suction, the swarf can be discharged easily and quickly every time the swarf is discharged every part of the target drilling depth.

  Further, in this embodiment, the sampling position regulating guide 7 to be brought into contact with the surface of the concrete body 11 is attached to the outer periphery of the drill cutting body 2 in the sampling drill cutting 1 so that the axial mounting position can be changed. Therefore, in order to perforate the concrete body 11 to the target perforation depth, it is possible to easily perforate a part of the depth repeatedly. Thereby, the drilling depth at the time of concrete sample collection can be clarified, and the risk of damaging the reinforcing bars in the concrete body 11 at the time of drilling can be reduced.

  FIG. 4 shows another embodiment of the present invention. In this embodiment, the discharge of the swarf 12 from the main body sampling port 6 of the sampling drill cutter 1 can be inserted into and removed from the hollow space of the drill cutter main body 2 in place of the vacuum suction in the previous embodiment. In this method, the smash 12 is grasped by the inserted gripping member 13.

It is explanatory drawing which shows the concrete sample collection method which concerns on one Embodiment of this invention. It is a partial abbreviation sectional view of an example of the drill for cutting used for the concrete sample collection method. It is process explanatory drawing of the concrete sample collection method. It is explanatory drawing of other embodiment of the concrete sample collection method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sampling drill cutting 2 ... Drill cutting main body 3 ... Cutting blade 4 ... Shank part 5 ... Idle member 6 ... Main body part sampling port 7 ... Sampling position control guide 9 ... Suction sampling port 11 ... Concrete body 12 ... Shatter 13 ... Grip member

Claims (6)

  A concrete drilling target with a sampling hole that has a sampling port that opens to the outside from the hollow space, and has a hollow shape that crushes the concrete in a circular range by screwing and allows the debris to enter inside, and drills the target concrete body to be sampled. It is characterized by collecting the concrete sample as the debris by repeatedly drilling a part of the depth and discharging the debris in the collection drill cut from the collection port to the target drilling depth. Concrete sample collection method.   2. The concrete sample collecting method according to claim 1, wherein the swarf is discharged from the sampling port of the sampling drill by vacuum suction.   The concrete sample collecting method according to claim 1, wherein the discharge of the crushed debris from the sampling port of the sampling drill cutter is performed by gripping with a gripping member that is removably inserted into the hollow space.   A concrete neutralization measurement method, wherein a concrete sample is collected using the concrete sample collection method according to any one of claims 1 to 3, and the progress of neutralization of the collected concrete sample is measured with a working liquid.   A drill cutting body that has a cutting edge on the periphery of the tip, is crushed by a screw to crush the concrete body, and the debris enters the inside. The drill cutting body is provided at the base end of the drill cutting body and can be attached to the chuck of the drill device. The main body portion that is rotatably mounted at an axial position where the main body portion sampling port is provided on the outer periphery of the shank portion, the main body sampling port provided in the vicinity of the base end of the drill cutting main body, and the drill cutting main body A sampling drill cutter comprising: an idle member that forms a sealed space communicating with a sampling port; and a suction sampling port that is provided in the idle member and is connectable to a vacuum suction device.   6. The sampling drill cutter according to claim 5, wherein a sampling position regulating guide to be brought into contact with the surface of the concrete body is detachably attached to the outer periphery of the drill cutter main body so that the axial mounting position can be changed.

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