JP2018081071A - Non-destructive inspection method for metal member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-destructive inspection method for a metal member capable of detecting a metal member such as joint hardware being positioned at a predetermined position or being deviated therefrom in a non-contact manner in a wooden building.SOLUTION: A non-destructive inspection method for a metal member includes the steps of: irradiating an inspection object 1 of a wooden building with an electromagnetic wave or a magnetic flux; detecting, on the basis of information acquired from the electromagnetic wave or the magnetic flux by the metal member in the inspection object 1, the presence/absence of the metal member; and detecting, on the basis of a position of each inspection object and the metal member detected at the position, arrangement information of the metal member; attaching an IC tag in which information of the metal member is stored to the metal member before construction; installing a reader/writer 20 in the vicinity of the inspection object during the construction or after the construction to read the arrangement information of the metal member by the reader/writer 20; and acquiring the position information of each inspection object 1 by a GPS receiver 20a.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a non-destructive inspection method for metal members, and more particularly to a non-destructive inspection method for metal members used for construction work of buildings.

  Concerning the quality assurance of the construction industry, the conventional inspections, such as the 2005 structural calculation counterfeiting problem, the Yokohama pile disguise problem in recent years, and the Haneda Airport runway ground improvement disguise problem, cannot be overlooked. Confidence from those who have declined.

  Among the buildings damaged by the recent Kumamoto earthquake, some wooden houses built after 2000 according to the current regulations are considered to have been severely damaged due to poor construction. . As the current form of construction of wooden buildings, the pre-cutting method of wood by factories has become the mainstream, so it is considered that a certain level of quality of wood processing can be secured.

  Non-Patent Document 1 describes that in a building constructed by welding a frame that uses a steel frame, an IC tag is pasted in the vicinity of the joint of each member constituting the building, and production information management is performed. Attempts to improve the reliability of things have been reported.

http://www.kenken.go.jp/japanese/research/lecture/h20/pdf/03.pdf

  Non-Patent Document 1 discloses that an IC tag is attached to the vicinity of a joint portion of each member constituting a building and production information management is performed, but after being constructed like a wooden house or during construction. There is no disclosure on how to inspect a metal member such as a joint hardware that is not visually recognized.

  As described above, the current situation is that there is no excellent method for inspecting the construction quality of metal members such as metal fittings for joining wood from the standpoint of consumers.

  In view of the above-described problems, the object of the present invention is to provide a metal structure such as a joint hardware in a wooden building or the like according to design specifications, use an appropriate member, or place the metal member in a predetermined position. It is an object of the present invention to provide a non-destructive inspection method for a metal member, which can detect non-contact whether or not there is a positional deviation.

  In order to achieve the above object, the non-destructive inspection method for a metal member of the present invention irradiates an electromagnetic wave or a magnetic flux to an inspection object of a wooden structure after construction or a wooden structure under construction, The presence or absence of a metal member is detected based on information obtained from electromagnetic waves or magnetic flux by metal, and the arrangement information of the metal member is detected by the position of each inspection object and the metal member detected at the position. .

In the above configuration, an IC tag storing information on the metal member is attached to the metal member before construction, a reader / writer is installed in the vicinity of the inspection object during or after construction, and the metal member is arranged by the reader / writer. The configuration information may be read out.
The inspection object may be heated by electromagnetic pulses, induction heating, or far-infrared irradiation, and heat of the metal member in the inspection object may be detected to obtain an image of the metal member.
The object to be inspected is magnetized by a magnetizing means such as an electromagnetic pulse, a magnet and a magnetizer, and the magnetic flux of the metal member in the object to be inspected is detected. May be obtained.
You may acquire the positional information for every test object with a GPS receiver.

  According to the nondestructive inspection method for a metal member of the present invention, the presence, size, displacement, etc. of a non-destructive joint metal by non-destructive heating or magnetizing with an IC tag or electromagnetic wave during or after construction of a wooden structure or a wooden building Therefore, it is possible to inspect non-destructively whether or not the metal member is properly arranged according to the design specification.

It is a perspective view which shows an example of the test target object of the nondestructive inspection method of the metal joint concerning the 1st Embodiment of this invention. It is a perspective view which shows a joining metal fitting as a metal member, (A) is the arrangement | positioning state of a receiving metal fitting and a drift pin, (B) is a drift pin. It is a figure which shows the construction procedure of a test target object. It is a schematic diagram which shows the nondestructive inspection method of the metal member of this invention. It is a figure explaining the attachment method 1 of the IC tag for drift pins to a drift pin, (A) is before attachment of the IC tag for drift pins, (B) is the state which attached the IC tag for drift pins Is shown. It is a figure explaining the attachment method 2 of the IC tag for drift pins to a drift pin, (A) is before attachment of the IC tag for drift pins, (B) is the state which attached the IC tag for drift pins Is shown. It is a figure explaining the attachment method 3 of the IC tag for drift pins to a drift pin, (A) is before attachment of the IC tag for drift pins, (B) is the state which attached the IC tag for drift pins Is shown. It is a figure explaining the attachment method 4 of the IC tag for drift pins to a drift pin, (A) is before attachment of the IC tag for drift pins, (B) is the state which attached the IC tag for drift pins Is shown. It is a figure explaining the attachment method 5 of the IC tag for drift pins to a drift pin, (A) is the state before attachment of the IC tag for drift pins, (B) is the state which attached the IC tag for drift pins Is shown. It is a figure explaining the attachment method 6 of the IC tag for drift pins to a drift pin, (A) is the state before attachment of the IC tag for drift pins, (B) is the state which attached the IC tag for drift pins Is shown. It is a figure explaining the attachment method 7 of the IC tag for drift pins to a drift pin, (A) is the state before attachment of the IC tag for drift pins, (B) is the state which attached the IC tag for drift pins Is shown. It is a figure explaining the attachment method 8 of the IC tag for drift pins to a drift pin, (A) is before attachment of the IC tag for drift pins, (B) is the state which attached the IC tag for drift pins Is shown. It is a figure explaining the attachment method 9 of the IC tag for drift pins to a drift pin, (A) is before attachment of the IC tag for drift pins, (B) is the state which attached the IC tag for drift pins Is shown. It is a figure explaining the attachment method 10 of an IC tag, (A) is before attachment of an IC tag, (B) has shown the state which attached the IC tag to the nail. It is a schematic diagram explaining the nondestructive inspection method of the metal joint which concerns on the 2nd Embodiment of this invention. It is a schematic diagram explaining the infrared image which arises from a test target object. It is a schematic diagram explaining the nondestructive inspection method of the metal joint concerning the 3rd Embodiment of the present invention. In Example 1, it is a figure which shows the state before inserting the drift pin used as the test object 1 in the pillar and beam shown in FIG. In Example 1, it is a figure which shows the external appearance after inserting a metal fitting and a drift pin into a pillar and a beam. The typical heating arrangement | positioning of the test object of Example 2 is shown, (A) is a perspective view, (B) is sectional drawing along the II line | wire of (A). It is an infrared image by the induction heating of the metal joint arrange | positioned under the wooden member of Example 2, (A) is a figure before induction heating, (B) is a figure which shows the state which 30 second passed after induction heating. In Example 3, it is a schematic diagram which shows the external appearance after inserting a metal fitting and a drift pin in the pillar and beam similar to Example 1. FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The scope of the present invention can be appropriately changed without being limited to the embodiment. In particular, the shape, dimensions, positional relationship, and the like of each member described in the drawings merely show conceptual matters, and can be changed according to the application scene. In each figure, the same or corresponding members are denoted by the same reference numerals.

(First embodiment)
FIG. 1 is a perspective view showing an example of an inspection object 1 in the nondestructive inspection method for a metal joint 4 according to the first embodiment of the present invention, and FIG. 2 is a perspective view showing the metal joint 4 as a metal member. , (A) shows the arrangement state of the metal receiving object 5 and the drift pin 6 which becomes an insertion part, and (B) shows the drift pin 6. FIG. 3 is a diagram showing a construction procedure of the inspection object 1.
As shown in FIG. 1, an inspection object 1 for performing a nondestructive inspection according to the present invention is a metal fitting 4 used for connecting, for example, a column 2 and a beam 3 of a wooden building or a wooden structure.

  In the case shown in the drawing, a receiving metal 5 is inserted into the column 2 and the beam 3. The plurality of drift pins 6 are inserted into the through-holes 3 b formed in the beam 3 on the receiving metal 5, so that the column 2 and the beam 3 are joined and fixed by the bonding metal 4 including the receiving metal 5 and the drift pin 6. Is done. In the present invention, the wooden structure includes a structure made of a wooden member disposed in a Japanese-style room or the like in a reinforced concrete frame structure, in addition to a normal wooden frame structure. The metal member will be mainly described as the joint hardware 4.

  As shown in FIG. 2 (A), the metal receiving piece 5 has a rectangular plate shape made of metal. Three holes 5a, 5b, 5c into which drift pins are inserted are formed in the upper, middle and lower portions along the long side of the receiving metal 5, and the receiving metal is formed in a region other than the holes 5a, 5b, 5c. IC tag 12 is attached. Since the IC tag 12 is inserted into a groove formed at a predetermined location of the pillar 2, it is desirable that the recess is formed in the metal receiving member 5, for example, so that the surface of the metal receiving member 5 is flat.

  As the IC tag 12 for receiving metal, for example, a 900 MHz band that is a UHF band or a 2.45 GHz IC tag can be used. In the IC tag 12, it is desirable that data indicating the component information of the received metal 5 is stored in an integrated circuit (IC) that constitutes the IC tag. Among IC tags, a passive type that responds with a signal from a reader / writer described later is also called an RFID (Radio Frequency Identifier) tag.

  As shown in FIG. 2B, a drift pin IC tag 14 is attached to the left end 6 a of the drift pin 6. As the IC tag 14 for the drift pin, for example, an IC tag of 900 MHz band or 2.45 GHz which is a UHF band can be used, similar to the IC tag 12 for receiving metal.

As shown in FIG. 3, the construction of the inspection object 1 is performed according to the following procedure. In the following description, it is assumed that the IC tags 12 and 14 are attached to the metal fitting 5 and the drift pin 6 in advance on the metal fitting 4.
Step S <b> 1: Two pieces of metal objects with IC tags 12 attached in advance are inserted into the groove portions 2 a formed at predetermined positions of the pillar 2. Step S1 may be performed in advance at a factory where the pillar 2 is processed.
Step S2: Insert the groove 3a of the beam 3 into the metal receiving piece 5.
Step S3: Three drift pins 6 are inserted into the three through holes 3b, 3b, 3b of the drift pins arranged on the beam 3.

(Non-destructive inspection method 1)
Next, after the construction of the inspection object 1 or during the construction of the structure, it is detected in a non-contact manner that, for example, the joint hardware 4 used for connecting the pillar 2 and the beam 3 of the wooden structure is in a predetermined position. A nondestructive inspection method will be described.
FIG. 4 is a schematic diagram showing a nondestructive inspection method for the metal joint 4 of the present invention.
First, the inspector installs the reader / writer 20 in the vicinity of the inspection object 1. A reading electromagnetic wave signal 21 is sent from the reader / writer 20 to the inspection object 1, and the electromagnetic wave signal 22 related to the component information from the IC tags 12 and 14 attached to the inspection object 1 is received.

  The inspector can obtain the part information from the IC tag 12 to which the metal object 5 is pasted from the inspection object 1 and the part information from the IC tag 14 that is pasted to the drift pin 6. As a result, the inspector can determine that the bonding hardware 4 including the receiving metal 5 and the drift pin 6 is arranged at a predetermined position in the inspection object 1 by the reader / writer 20.

  By the nondestructive inspection method using the IC tags 12 and 14 and the reader / writer 20, the inspector can arrange the location where the inspection object 1 is arranged, that is, position information, and the joint metal 4 incorporated in the inspection object 1. Parts information can be acquired.

  Further, the position information of the inspection object 1 may be acquired by a GPS receiver 20 a disposed in the reader / writer 20. When the position information is acquired by the GPS receiver 20a, the position information for each inspection object 1 and the arrangement information of the joint hardware 4 for each position are obtained. The arrangement information includes information on construction in the field such as presence / absence of arrangement, suitability of arrangement position / length / direction, and deviation. By drawing this position information and the arrangement information of the joint metal 4, it is possible to produce the layout of the joint metal 4 and to compare the layout of the joint metal 4 with the design drawing. By comparing the layout of the metal fitting 4 with the design drawing, it is possible to inspect whether the construction has been performed according to the design drawing.

  Furthermore, it may be connected to the Internet via a communication line 24 such as a wired line or a wireless line, and data such as a layout drawing of the joint hardware 4 of the entire building may be sent to a computer 25 such as a PC or a server.

  Thereby, when the design drawing and the construction drawing created by inspecting at the construction site by the nondestructive inspection method are compared, it is possible to detect the positional deviation or the like of the joint hardware 4.

  Furthermore, after the long time after construction, for example, after 30 years or 60 years, when the position of the joint hardware 4 of the whole building is measured by the above-described nondestructive inspection method, the position of the joint hardware 4 performed before that is measured. It is possible to check the displacement, that is, the distortion of the entire building.

  Furthermore, by measuring the position of the joint hardware 4 in the entire building when a large earthquake occurs, it becomes possible to check the distortion of the entire building caused by the earthquake.

(IC tag attachment method 1)
Next, various attachment methods of the IC tag 14 to the drift pin 6 serving as an insertion part and a nail described later will be described.
FIG. 5 is a diagram for explaining a method 1 for attaching the IC tag 14 for the drift pin to the drift pin 6. As shown in FIG. 5A, a screw hole 6a is provided in the center of one end side on the left side of the drift pin 6, and a first pin in which the screw 15 can be inserted into the IC tag 14 for the drift pin. A fixing member 16 is connected. In the case of illustration, as an example of the 1st fixing member 16, it consists of the ring | wheel 16a and the wire | line 16b which connects to a part of ring | wheel 16a and connects an IC tag. The first fixing member 16 is fixed to the drift pin IC tag 14 with an adhesive or the like, for example.
As shown in FIG. 5B, a screw is inserted into the ring 16a, and the screw 15 is fastened to the screw hole 6a of the drift pin IC tag 14 with a tool such as a screwdriver, whereby the drift pin IC is connected to the drift pin 6. The tag 14 is fixed.

(IC tag attachment method 2)
A method 2 for attaching the IC tag 14 for the drift pin to the drift pin 6 will be described.
FIG. 6 is a diagram for explaining the method 2 for attaching the drift pin IC tag 14 to the drift pin 6. As shown in FIG. 6A, a recess 6b is provided at a predetermined distance from the left side of the drift pin, and the IC tag 14 for the drift pin can be inserted into the recess 6b of the drift pin. A second fixing member 17 is connected.
In the case of illustration, as an example of the 2nd fixing member 17, it consists of the line | wire 17b which connects the ring | wheel 17a and the IC tag 14 for drift pins connected to a part of ring | wheel 17a. The second fixing member 17 is fixed to the drift pin IC tag 14 with an adhesive or the like, for example.
As shown in FIG. 6B, the drift pin IC tag 14 is fixed to the drift pin 6 by inserting the wheel 17 a into the recess 6 b of the drift pin 6. The ring 17a may be fixed by an adhesive or the like after being inserted into the recess 6b of the drift pin 6.

(IC tag attachment method 3)
A method 3 for attaching the IC tag 14 for the drift pin to the drift pin 6 will be described.
FIG. 7 is a view for explaining a method 3 for attaching the drift pin IC tag 14 to the drift pin 6. As shown in FIG. 7A, at the center of the left end portion of the drift pin 6, a hole 6c and an insertion portion 6d of the drift pin 6 are provided at the bottom of the hole 6c. The insertion part of the drift pin 6 is a groove part formed in the bottom part of the hole part 6c, for example, and consists of the groove | channel provided in the bottom part of the hole part 6c from the side surface used as the outer periphery of the drift pin 6.
As shown in FIG. 7B, the drift pin IC tag 14 is inserted into the insertion portion 6d of the drift pin 6 and fixed. The drift pin IC tag 14 communicates with the reader / writer 20 through the hole 6 c of the drift pin 6, that is, the hole formed in the drift pin 6 from the end face.
Further, after the drift pin IC tag 14 is inserted into the insertion portion 6d of the drift pin 6, a resin plate or the like that substantially closes the drift pin IC tag 14 at the bottom of the hole 6c is bonded with an adhesive or the like. It may be used and affixed to the end portion of the IC tag 14 for drift pins.

(IC tag attachment method 4)
A method 4 for attaching the IC tag 14 for the drift pin to the drift pin 6 will be described.
FIG. 8 is a diagram for explaining a method 4 for attaching the IC tag 14 for the drift pin to the drift pin 6. As shown in FIG. 8A, the IC tag 14 for drift pins is covered with a resin or the like and has a disk shape. The third fixing member 18a is made of, for example, a metal cylinder, and a part of the third fixing member 18a has a cylindrical opening that accommodates the IC tag 14 for the drift pin. The IC tag 14 for the drift pin is fixed by an adhesive or the like in the opening portion of the third fixing member 18a. At this time, the outermost cylindrical surface of the opening portion of the third fixing member 18a is in a state where the metal is exposed. The surface of the outermost cylindrical portion of the opening portion of the third fixing member 18a is referred to as the head of the third fixing member 18a. The lower side of the third fixing member 18a is fixed to the head of the drift pin 6 with an adhesive or the like.

  As shown in FIG. 8B, the drift pin 6 to which the IC tag 14 for the drift pin is attached is inserted into the metal receiving member 5 when the head of the third fixing member 18a is hit with a tool. As a tool, a hammer or a wooden hammer can be used.

(IC tag attachment method 5)
A method 5 for attaching the IC tag 14 for the drift pin to the drift pin 6 will be described.
FIG. 9 is a diagram for explaining a method 5 for attaching the drift pin IC tag 14 to the drift pin 6. As shown in FIG. 9A, the IC tag 14 for drift pins is covered with a resin or the like and has a plate shape. The fourth fixing member 18b has a third shape shown in FIG. 8A in that a part of a metal cylinder, for example, has a groove-shaped opening that accommodates the IC tag 14 for drift pins. It is different from the fixing member 18a. The IC tag 14 for the drift pin is fixed by an adhesive or the like in the opening portion of the fourth fixing member 18b. At this time, the metal is exposed on the surface other than the outermost groove of the opening portion of the fourth fixing member 18b. The outermost surface of the opening portion of the fourth fixing member 18b is referred to as the head of the fourth fixing member 18b. The lower side of the fourth fixing member 18b is fixed to the head of the drift pin 6 with an adhesive or the like.

  As shown in FIG. 9B, the drift pin 6 to which the IC tag 14 for the drift pin is attached is inserted into the metal receiving member 5 when the head of the fourth fixing member 18b is hit with a tool. As a tool, a hammer or a wooden hammer can be used.

(IC tag attachment method 6)
A method 6 for attaching the IC tag 14 for the drift pin to the drift pin 6 will be described.
FIG. 10 is a diagram for explaining a method 6 for attaching the IC tag 14 for the drift pin to the drift pin 6. As shown in FIG. 10A, the IC tag 14 for drift pins is covered with a resin or the like and has a plate shape. For example, the fifth fixing member 18c is a column having a small diameter except for an upper portion and a lower portion of a metal cylinder, and the drift pin IC tag 14 is accommodated in this column as shown in FIG. This is different from the third fixing member 18a shown. The IC tag 14 for the drift pin is wound around the column portion of the fifth fixing member 18c and fixed by an adhesive or the like. At this time, the upper surface of the fifth fixing member 18c is in a state where the metal is exposed. The upper part of the fifth fixing member 18c is referred to as the head of the fifth fixing member 18c. The lower side of the fifth fixing member 18c is fixed to the head of the drift pin 6 with an adhesive or the like.

  As shown in FIG. 10B, the drift pin 6 to which the IC tag 14 for the drift pin is attached is inserted into the metal fitting 5 by hitting the head of the fifth fixing member 18c with a tool. As a tool, a hammer or a wooden hammer can be used.

(IC tag attachment method 7)
A method 7 of attaching the drift pin IC tag 14 to the drift pin 6 will be described.
FIG. 11 is a diagram for explaining a method 7 for attaching the drift pin IC tag 14 to the drift pin 6. As shown in FIG. 11A, the drift pin IC tag 14 is covered with a resin or the like, and has a cylindrical shape unlike the drift pin IC tag 14 of FIG. 9A. For example, the sixth fixing member 18d is a column having a small diameter except for the lower portion of a metal cylinder, and the third portion shown in FIG. 8A is that the IC tag 14 for the drift pin is accommodated in this column. This is different from the fixing member 18a. The IC tag 14 for the drift pin is inserted into the column portion of the sixth fixing member 18d and fixed with an adhesive or the like. At this time, the upper surface of the sixth fixing member 18d is in a state where the metal is exposed. The upper part of the sixth fixing member 18d is called the head of the sixth fixing member. The lower side of the sixth fixing member 18d is fixed to the head of the drift pin 6 with an adhesive or the like.

  As shown in FIG. 11 (B), the drift pin 6 to which the IC tag 14 for the drift pin is attached is inserted into the metal fitting 5 when the head of the sixth fixing member 18d is hit with a tool. As a tool, a hammer or a wooden hammer can be used.

(IC tag attachment method 8)
A method 8 for attaching the IC tag 14 for the drift pin to the drift pin 6 will be described.
FIG. 12 is a diagram illustrating a method 8 for attaching the drift pin IC tag 14 to the drift pin 6. As shown in FIG. 12A, from the upper side to the lower side of the drift pin 6, a cylindrical portion smaller than the upper diameter, that is, a second IC tag insertion portion 6e is formed. The uppermost part is a disc having a predetermined thickness. A plate-shaped drift pin IC tag 14 shown in FIG. 12A is wound around a cylindrical portion, inserted into the second IC tag insertion portion 6e, and fixed by an adhesive or the like. At this time, the upper surface of the drift pin 6 is in a state where the metal is exposed, and is called a head.

  As shown in FIG. 12 (B), the drift pin 6 to which the IC tag 14 for drift pins is attached is inserted into the metal fitting 5 by hitting its head with a tool. As a tool, a hammer or a wooden hammer can be used.

(IC tag attachment method 9)
A method 9 for attaching the IC tag 14 for the drift pin to the drift pin 6 will be described.
FIG. 13 is a diagram for explaining a method 9 for attaching the drift pin IC tag 14 to the drift pin 6. As shown in FIG. 13A, from the upper side to the lower side of the drift pin 6, a cylindrical portion having a smaller diameter than the main body portion of the drift pin 6, that is, a third IC tag insertion portion 6f is formed. Yes.
An IC tag 14 for a cylindrical drift pin shown in FIG. 13A is inserted into the third IC tag insertion portion 6f and fixed with an adhesive or the like. At this time, the upper surface of the drift pin 6 is in a state where the metal is exposed, and is called a head.

  As shown in FIG. 13B, the drift pin 6 to which the IC tag 14 for the drift pin is attached is inserted into the metal receiving member 5 by hitting its head with a tool. As a tool, a hammer or a wooden hammer can be used.

  Both the second and third IC tag insertion portions 6e and 6f can be formed by grinding or the like on the head side of the drift pin 6.

(IC tag mounting method 10)
Next, a method 10 for attaching an IC tag when using a nail as an insertion part without using the receiving metal 5 will be described.
FIG. 14 is a diagram for explaining an attachment method 10 of the IC tag 14a. As shown in FIG. 14A, the IC tag 14a includes a third fixing member 28 into which the nail 27 can be inserted, and a washer 28 into which the nail 27 can be inserted is prepared. In the case of illustration, as an example of the third fixing member 28, a third connection comprising a ring 28a into which the nail 27 can be inserted and a line 28b connected to a part of the ring 28a and connecting the IC tag 14a. A line is shown. For example, the third connection line serving as the third fixing member 28 is fixed to the IC tag 14a with an adhesive or the like.
As shown in FIG. 14 (B), a nail 27 and a washer 29 are inserted in this order into a ring 28a of a connecting line, and the nail 27 is driven into a pillar 2 or a beam 3 (not shown) by using a hammer, so that the IC tag 14a is It is fixed to the nail 27.

(IC tag attachment method 11)
A method 11 for attaching the insertion parts such as the drift pin 6 and the nail 27 to the IC tag will be described.
The wire 16b and the wire 17b may be fixed to the end face in the longitudinal direction of the drift pin 6 by welding, brazing, adhesive, or the like. When the drift pin 6 is made of metal, the wires 16b and 17b can be welded or brazed, and when the drift pin 6 is made of resin or the like, it can be fixed with an adhesive. Similarly, the wire 28b may be fixed to the head of the metal nail 27 by welding or brazing. When the nail 27 is made of resin, the wire 28b can be fixed to the head of the nail 27 with an adhesive.

(Second Embodiment)
Next, a nondestructive inspection method for the metal joint 4 according to the second embodiment of the present invention will be described.
FIG. 15 is a schematic diagram for explaining a nondestructive inspection method for the metal joint 4 according to the second embodiment of the present invention, and FIG. 16 is a schematic diagram for explaining an infrared image generated from the inspection object 1.
As shown in FIG. 15, in the vicinity of the inspection object 1, a heating coil 32 for heating the joint metal 4 is disposed in close proximity, and a heat detection device 40 for detecting the heat from the joint metal 4 is arranged. It is installed.

  The heating coil 32 is connected to a heating power source 30 that performs electromagnetic pulses, induction heating (also referred to as induction heating or IH), or far infrared irradiation. As an example of the frequency of the heating power source 30, 20 kHz to 100 kHz or 13.56 MHz, 2.45 GHz, which is an industrial heating frequency, or the like can be used. In the heating apparatus 30 for IH, the heating coil 32 may be incorporated.

  The heat detection device 40 is a device that detects heat from the metal joint 4, and includes a heat detection sensor 42, a heat detection unit 43, a display unit 44, and the like.

  As the heat detection sensor 42, an infrared camera using a detector such as a thermopile, a bolometer, or an infrared photodiode can be used. The heat detection unit 43 sends a signal acquired from the infrared camera to the display unit 44.

(Non-destructive inspection method 2)
Next, after the construction of the inspection object 1, for example, that the joint metal 4 used for connecting the pillar 2 and the beam 3 of the wooden structure is in a predetermined position, heating by electromagnetic pulse, induction heating or far infrared irradiation A non-destructive inspection method for non-contact detection will be described.
As shown in FIG. 15, the joint metal 4 (the metal object 5 and the drift pin 6 shown in black in FIG. 16) in which the inspection object 1 is also inside is provided by the heating coil 32 disposed in the vicinity of the inspection object 1. Heat is detected by the infrared camera, and an infrared image of the heat generated in the inspection object 1 is displayed on the display unit 44. As a result, the shape of the metal joint 4 that is more easily heated than the wood such as the pillar 2 and the beam 3 is known, and the presence of the metal joint 4 is confirmed by comparison with the design drawing.

  Further, the position information of the inspection object 1 may be acquired by a GPS receiver 43 a disposed in the heat detection unit 43. When the position information is acquired by the GPS receiver 43a, the position information for each inspection object 1 and the arrangement information of the joint hardware 4 for each position are obtained. By drawing this positional information and the arrangement information of the joint hardware 4, data such as the layout drawings of the joint hardware 4 in the entire building can be obtained and compared with the design drawing.

  Furthermore, it may be connected to the Internet via a communication line 24 such as a wired line or a wireless line, and data such as drawings of the joint hardware 4 of the entire building may be sent to a computer 25 such as a PC or a server.

  According to the nondestructive inspection method of the present invention, an electromagnetic pulse, induction heating, or the like is used to cause a temperature difference between the joint metal 4 that is easily heated compared to the wood such as the pillar 2 and the beam 3, and this temperature. By imaging the difference, it is possible to obtain the arrangement information of the metal joint 4 built in the inspection object 1.

(Third embodiment)
Next, a nondestructive inspection method for a metal joint according to the third embodiment of the present invention will be described.
FIG. 17 is a schematic diagram for explaining a nondestructive inspection method for the metal joint 54 according to the third embodiment of the present invention. As shown in FIG. 17, in the vicinity of the inspection object 50, a magnetizing means 51 for magnetizing the metal joint 54 from the outside with an electromagnetic pulse or a strong magnet is disposed in close proximity, and the magnetized metal joint 54 is magnetized. A hall element 60 and a search coil 61 are disposed as sensors for detecting magnetic flux disposed outside the device, and are connected to the magnetic flux detection device 65. As the magnetizing means 51, a magnetizer that is magnetized by a current pulse can be used. Examples of such a magnetizer include a commercially available capacitor type magnetizer.

  In FIG. 17, as an example of the joint metal 54 of the inspection object 50, the magnetization of the joint metal 56 when the wooden member 55 and the wooden member 56 are fixed via the joint metal 54 is illustrated.

  The Hall element 60 and the search coil 61 can be preferably used for measuring the magnetic flux of the magnetized bonding metal 54. As the magnetic flux detection device 65, a teslameter or the like can be used.

(Non-destructive inspection method 3)
Next, a nondestructive inspection method for detecting, in a non-contact manner, that the joint metal 54 used for connecting the pillar 2 and the beam 3 of the wooden structure is in a predetermined position after the construction of the inspection object 1 will be described. To do.
As shown in FIG. 17, a magnetic flux from the north pole to the south pole is formed by magnetizing the metal joint 54. After magnetizing the metal joint 54, the Hall element 60 and the search coil 61 are scanned in the direction from the wooden member 55 to the wooden member 56 as shown in the figure. Since both ends of the metal joint 54 are N and S poles, that is, magnetic poles, and the magnetic flux is large, the positions of the magnetic poles are measured.

  As shown in the figure, by measuring the position of the magnetic pole, the length of the metal joint 54, that is, the insertion amount (depth) of the metal joint 54 can be determined. As a result, the presence of the metal joint 54 can be determined by measuring the position of the magnetic pole, and the presence of the metal joint 54 can be confirmed by comparing with the design drawing. Furthermore, since the amount of insertion is known from the position of the magnetic pole, it is possible to determine whether the construction is good or bad.

  Further, the position information of the inspection object 1 may be acquired by a GPS receiver 65 a disposed in the magnetic flux detection device 65. When the position information is acquired by the GPS receiver 65a, the position information for each inspection object 1 and the arrangement information of the joint hardware 54 for each position are obtained. By drawing this positional information and the arrangement information of the joint hardware 54, data such as the layout drawing of the joint hardware 54 of the entire building can be obtained and compared with the design drawing.

  Furthermore, it may be connected to the Internet via a communication line 24 such as a wired line or a wireless line, and data such as a drawing of the joint hardware 54 of the entire building may be sent to a computer 25 such as a PC or a server.

According to the non-destructive inspection method of the present invention, the bonding hardware 54 is magnetized and the bonding hardware 54 inside the non-magnetized wooden members 55, 56 is detected by the Hall element 60 or the search coil 61, so that the location is present. Further, since the insertion amount can be determined by the position of the magnetic pole, information on the bonding hardware 54 built in the inspection object 1 or the arrangement state of the bonding hardware 54 can be acquired.
Examples of the nondestructive inspection method of the present invention are shown below.

Example 1 of the nondestructive inspection method for the metal joint according to the first embodiment will be described.
18 is a diagram illustrating a state before the drift pin 6 is inserted into the column 2 and the beam 3 illustrated in FIG. 1 in the first embodiment. FIG. 19 is a diagram illustrating the state received by the column 2 and the beam 3 according to the first embodiment. It is a figure which shows the external appearance after inserting the metal fitting 5 and the drift pin 6. FIG.
The width of the pillar 2 is 10.5 cm square. The beam 3 has a width of 10.5 cm (see a in FIG. 18), and a width of 17.3 cm. The formation of the beam 3 is also called a beam formation, and has a dimension from the upper end to the lower end of the beam 3 as shown by b in FIG.

  As the IC tag 12 for receiving metal, a metal-compatible tag (manufactured by NOF Corporation, TAGAT75X) having a size of 15 × 5 × 3.5 mm in the UHF band was fixed with cello tape (registered trademark).

  The drift pin IC tag 14 was a metal-compatible tag (manufactured by NOF Corporation, TAGAT81) having a size of 9 × 9 × 3.5 mm in the UHF band, and was fixed to the tip of the drift pin with cello tape (registered trademark).

  The reader / writer 20 used DOTR-920J of Tohoku Systems Support Co., Ltd., and an Android smartphone (Sony, XPERIA) was connected wirelessly (Bluetooth) for the operation of the reader / writer 20.

  Before the assembly of the pillar 2 and the beam 3, a part number such as “0800b001” or the like is written in advance as tag information by the reader / writer 20 before the assembly of the pillar 2 and the beam 3.

  As shown in FIG. 19, the IC tag was read by the reader / writer 20 in a state where the metal fitting 5 and the drift pin 6 were inserted into the pillar 2 and the beam 3. Before the assembly of the pillars 2 and the beams 3, the tag information for the one IC tag 12 for receiving metal and the six IC tags 14 for drift pins could be read in advance as tag information by the reader / writer 20.

  Based on the above result, the non-destructive inspection method using the IC tags 12 and 14 and the reader / writer 20 allows the inspector to detect the position information of the inspection object 1 and the joint hardware incorporated in the inspection object 1. 4 parts information can be obtained.

Example 2 of the non-destructive inspection method for metal joints according to the second embodiment will be described.
FIG. 20 shows a schematic heating arrangement of the inspection object 1 according to the second embodiment, in which (A) is a perspective view and (B) is a cross-sectional view taken along line II in (A).
As shown in FIG. 20, the inspection object 1 has a structure in which a metal joint 74 is inserted below the wooden member 57. The wooden member 57 is a plate material made of lauan having a thickness of 4 mm. The metal joint 74 is made of a plate having a thickness of 4.5 mm and has a substantially T shape. An IH heating power supply device 30 (not shown) is disposed on the upper side of the metal joint 74 to heat the metal joint 74, and the surface temperature of the wooden member 57 was measured using an infrared camera as the heat detection sensor 42.

  FIGS. 21A and 21B are infrared images obtained by induction heating of the metal joint 74 disposed in the lower part of the wooden member 57 of Example 2. FIG. 21A is before induction heating, and FIG. 21B is 30 seconds after induction heating. It is a figure which shows the state which carried out. As shown in FIG. 21A, it can be seen that the surface of the wooden member 57 is at room temperature before induction heating, and the metal joint 74 disposed on the lower side of the wooden member 57 is not observed. When 30 seconds passed after induction heating, a T-shape of the metal joint 74 was observed as an infrared image as shown in FIG. The highest temperature region was found to be about 45-50 ° C. As a result, the position of the inspection object 1 and the existence of the joint hardware 74 disposed under the wooden member 57 can be understood, and the relationship between the position of the inspection object 1 after construction and the joint hardware 74, that is, It can be seen that a layout drawing can be created.

Example 3 of the non-destructive inspection method for the joint hardware according to the third embodiment will be described.
A nondestructive inspection by magnetization of the drift pin 6 was performed. Specifically, the drift pin 6 was previously magnetized with a neodymium magnet having a magnetic flux density of 561 mT, and the metal fitting 5 and the drift pin 6 were attached to the column 2 and the beam 3. The magnetic flux density before magnetization of the end portion of the drift pin 6 was 0.05 mT, and the magnetic flux density of the end portion of the drift pin 6 magnetized by the neodymium magnet was approximately 3.42 mT.

FIG. 22 is a schematic diagram showing an external appearance of the third embodiment after the metal fitting 5 and the drift pin 6 are inserted into the pillar 2 and the beam 3 similar to those in the first embodiment. As shown in FIG. 22, the drift pins 6 are inserted at four positions on the left and right sides of the beam 3, and the drift pins 6 are inserted into the first and third stages from the upper left side for inspection. Not. Drift pins 6 were inserted into four locations on the right side of the beam 3.
After the column 2 and the beam 3 were constructed, the drift pin 6 hidden inside the column 2 and the beam 3 was detected by a Tesla meter (manufactured by Nippon Electromagnetic Instrument Co., Ltd., portable Tesla meter, GV-400).

The inspector manually scanned the sensor of the Teslameter along the intersection line on the left side of the pillar 2 and the beam 3 after the construction, and the magnetic flux density at the insertion position of the drift pin 6 was measured. The results are shown in Table 1.

As shown in Table 1, the magnetic flux density in the first stage from the top without the drift pin 6 is 0.01 mT, 0.26 mT near the second stage from the top with the magnetized drift pin 6 and 3 from the top without the drift pin. It was 0.03 mT in the vicinity of the stage, and 0.30 mT in the vicinity of the fourth stage from the top where the magnetized drift pin 6 is present.
According to the above result, the magnetic flux density at the location where the magnetized drift pin 6 is present is 10 to 30 times greater than the magnetic flux density at the location where the drift pin 6 is not present, so the position of the drift pin 6 at the construction location is easily detected. I was able to.

  From the above results, according to the non-destructive inspection method for metal members of the present invention, it is easy to easily and easily non-destructively connect the wooden structure 74 and the metal fitting 74 inside the wooden structure, which has been difficult to implement in the past. It was found that it can be inspected.

  The present invention can be implemented in various forms without departing from the spirit of the present invention. For example, in the first embodiment described above, after the presence of the IC tags 12 and 14 is confirmed, the inspection object 1 is heated according to the second embodiment, and an infrared image of the metal member is acquired. Good.

  In the first embodiment described above, after the presence of the IC tags 12 and 14 is confirmed, the inspection object 1 is magnetized according to the third embodiment, the magnetic flux of the metal member is measured, and the position of the magnetic pole is determined. The amount of insertion may be measured. Moreover, after heating the test object 1 by 2nd Embodiment and acquiring the infrared image of a metal member, you may test | inspect the test object 1 by 3rd Embodiment.

DESCRIPTION OF SYMBOLS 1,50: Inspection object 2: Column 3: Beam 3a: Groove 3b: Through hole 4, 54, 74: Metal fitting 5: Receptacle 5a, 5b, 5c: Hole 6: Drift pin 6a: Screw hole 6b: Recess 6c: Hole 6d: First insertion portion 6e: Third IC tag insertion portion 6f: Third IC tag insertion portion 12: IC tag 14 for receiving hardware: IC tag 14a for drift pin: For nail IC tag 15: screw 16: first fixing member 16a: wheel 16b: wire 17: second fixing member 17a: wheel 17b: wire 18a: third fixing member 18b: fourth fixing member 18c: fifth Fixing member 18d: sixth fixing member 20: reader / writer 20a, 43a, 65a: GPS receiver 21: electromagnetic wave signal for reading 22: electromagnetic wave signal related to component information 24: communication line 25: computer 27: nail 27
28: third fixing member 28a: wheel 28b: wire 29: washer 30: heating power supply 32: heating coil 40: heat detection device 42: heat detection sensor 43: heat detection unit 44: display unit 51: magnetizing means 55, 56, 57: Wooden member 60: Hall element 61: Search coil 65: Magnetic flux detection device

Claims (5)

Irradiate electromagnetic wave or magnetic flux to the inspection object of the wooden structure,
Based on information obtained from the electromagnetic wave or the magnetic flux by the metal member in the inspection object, the presence or absence of the metal member is detected,
A non-destructive inspection method for a metal member, wherein arrangement information of the metal member is detected by a position for each inspection object and the metal member detected at the position. The metal member is pasted with an IC tag storing information on the metal member before construction,
Install a reader / writer in the vicinity of the inspection object during or after construction,
The nondestructive inspection method for a metal member according to claim 1, wherein arrangement information of the metal member is read by the reader / writer. The inspection object is heated by electromagnetic pulse, induction heating or far infrared irradiation,
Detecting heat by heating the metal member in the inspection object to obtain an image of the metal member;
The nondestructive inspection method of the metal member of Claim 1 or 2. The inspection object is magnetized by an electromagnetic pulse, magnet, magnetizer or other magnetizing means,
The nondestructive inspection method of the metal member in any one of Claims 1-3 which detects the magnetic flux of the said metal member in the said test object, and obtains the information regarding the shape or arrangement | positioning state of this metal member. The nondestructive inspection method of the metal member in any one of Claims 1-4 which acquires the positional information for every said test target object with a GPS receiver.