JP2002313628A - Demagnetizing coil of demagnetizer for building construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a demagnetizing coil of demagnetizer for building construction that can shorten the construction period of a building construction and reduce the construction cost of the structure, by making the demagnetization of residual magnetism quicker at the construction site of the structure when the coil is constituted to reduce its weight while the coil maintains prescribed rigidity. SOLUTION: This demagnetizing coil 1 which is arranged on the surface of the building construction generating obstructive magnetism to demagnetize a ferromagnetic material is constituted of angular coils 10 wound in a coil-like state, insulating sheets 11 interposed among the coils 10, and an insulating sheet 13 covering an insulating adhesive 12 and the angular coils 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a demagnetizing coil which has a predetermined rigidity and is light in weight and is effective for use in a demagnetizing apparatus for a building structure.

[0002]

2. Description of the Related Art With the progress of microelectronics, various electronic devices such as computers have been introduced into working spaces and living spaces, and when a magnetic environment exceeds the magnetic proof strength of the electronic devices, an obstacle generating area is formed. In a situation where the magnetic resistance of electronic devices is excessively sensitive, various magnetic disturbances, which have not been considered a problem in the past, have been reported and become a social problem.

[0003] The failure events that occur are, for example, fluctuations and color shifts of CRTs, image defects and image distortions of medical equipment and electron microscopes, and even inside buildings, in addition to leakage magnetic fields due to electric rooms and power lines for electric power, It has been pointed out that an "iron" moving body such as an elevator causes a magnetic disturbance by changing geomagnetism, or a case where a building structure itself has residual magnetism.

[0004] Since the location of a leaked magnetic field generated from an electric room or a power line for electric power is determined and a magnetic field is constantly generated, avoiding a magnetic obstacle is performed by moving an obstacle or by using a magnetic shield. In many cases, specific measures are taken by the construction of the building.However, it is difficult to identify the location of the residual magnetism of the building structure because it is often found after the building is completed, etc. However, the use of the magnetic shield is not an appropriate solution in terms of the space problem or the labor and cost for the work of applying the magnetic shield.

On the other hand, as a method for demagnetizing residual magnetism, there is an AC demagnetization method generally used for small electronic equipment. This AC demagnetization method utilizes a hysteresis magnetic characteristic of a ferromagnetic material used in electronic equipment. In order to remove the magnetization inside the ferromagnetic material, FIG.
As shown in (a), the power supply device 24 and the control device 25 pass the object 22 that needs to be demagnetized through the demagnetizing coil 21 that generates a magnetic field through the conveyor 23 or the like. A predetermined current is supplied to apply an AC magnetic field to the object 22 from the outside.

The strong alternating magnetic field 26 applied from the demagnetizing coil 21 to the object 22 is gradually reduced while changing alternately between plus and minus with time, as shown in FIG. In accordance with this, as shown in FIG. 5C, the alternating magnetic field 26 applied to the object is reduced, thereby finally leading the magnetic flux density 27 of the ferromagnetic material to the zero point in the magnetic flux density B-magnetic field H curve. It is demagnetized.

This method is desirable in that it completely removes the magnetized magnetic flux density. However, since it is essentially assumed that the object is passed through the demagnetizing coil, the position where the residual magnetism is generated However, the target area is too large and flat, such as floors, columns, and walls of buildings using steel bars and steel frames, so we do not consider passing through demagnetizing coils. Therefore, no idea of applying the AC demagnetization method to a building site has been proposed.

[0008] The manifestation of residual magnetism on the floor surface or the like is a result of the remanence magnetized in unspecified portions of the steel frame or the reinforcing bar in the concrete appearing as a whole as a result. Since it is difficult to specify the direction and intensity of the magnetic flux generated above, the actual situation cannot be confirmed without individual measurement at each site of the building.

Therefore, the following methods have been proposed as demagnetization methods for building structures at present.

A method using a permanent magnet. In this method, for example, a demagnetization is performed by applying a magnetic field 33 of opposite polarity to a remanence magnet 32 generated in the reinforcing bar 31 of the floor 30. Permanent magnet 3
4 is required to be arranged on the surface of the deck plate 35 or the like, so that it takes a lot of time to measure and adjust the magnetic field. Therefore, in some cases, the permanent magnet 34
Has the potential to become a new magnetic source.

[0011] A method of passing an attenuating alternating current to a demagnetizing coil. (See FIG. 7) In this method, the demagnetizing coil 40, the AC power supply 41, and the current control device 42 are mounted on the bogie 43, and the bogie 43 is automatically controlled by mounting the steering control device 46 and the control signal receiving antenna 47. The demagnetizing coil is arranged in parallel with the floor surface 44 of the building structure at the position where the residual magnetism is detected, and the current is gradually reduced while an alternating current is applied, thereby demagnetizing the remanent magnetism 45 of the reinforcing bar. are doing. However, this method has a problem in that the cost is increased due to the necessity of the separate current control device 42. In terms of performance, a power supply in the field is limited by an allowable current and a large current flows. It is also assumed that the demagnetization effect cannot be expected because of the inability to do so.

A method using an thyristor-based AC power supply. In this method, an AC power supply controlled to a state effective for demagnetization is connected to a demagnetization coil to demagnetize the current by gradually decreasing the current so that a current waveform is formed in a rectangular shape by a thyristor. . Therefore, although there is an advantage in that the waveform control is free, a large current is required for the power supply and a transformer is required to limit the large current, which increases the weight and increases the weight for transportation. Not suitable for use.

As described above, with respect to the method of demagnetizing residual magnetism generated in a building structure, although an extremely urgent and important problem due to the recent development of electronic equipment, an effective solution is still available. The fact is not shown.

In view of the above circumstances, the inventors of the present invention have already attempted to solve the problem by simplifying the movement of the apparatus and simplifying the demagnetization work using a normal power supply, thereby making it possible to implement a construction in a short time. We propose a demagnetization device suitable for structures.
(Japanese Patent Application No. 11-218238, Japanese Patent Application No. 11-2182)
No. 39 and Japanese Patent Application No. 11-224761)

The demagnetizing apparatus for a building structure according to the present proposal basically includes a demagnetizing coil 1 arranged on the surface of a building structure generating residual magnetism in a DC power supply by a capacitor in series with a current circuit 54. Connect, DC power supply capacitor 5
The demagnetizing coil generates a damping oscillating magnetic field that demagnetizes the residual magnetism of the building structure by the damping oscillating current of the resonance circuit specified by the capacitance of 0 and the resistance and inductance of the demagnetizing coil 1. The coil is arranged so as to match the position of the remanence, and is demagnetized in a short time by a normal power supply regardless of the polarity of the remanence.

Referring to FIG. 8, the demagnetizing apparatus according to the present invention will be described.
A rectified DC voltage is supplied from a V AC power supply 51 via a charging switch 52 and stored as a charge.

The capacitor 50 is connected to a current circuit 54 through a discharge switch 53,
When the discharge switch 53 is closed, the electric charge accumulated in 0 is discharged to the demagnetizing coil 1, and a magnetic field having a specific polarity can be obtained.

The above-described series circuit includes a capacitor C,
Since this circuit corresponds to a series resonance circuit that generates a transient phenomenon composed of the resistance R and the inductance L of the coil, the current flowing through the circuit has a circuit condition (R ² <4 L / C) according to the following equation.
In the case of the above, damped oscillation occurs.

[0019]

The damping oscillating current 56 illustrated in FIG. 9 and the damping oscillating current 57 having a different peak value flow through the demagnetizing coil 1 to generate an attenuating oscillating magnetic field in the demagnetizing coil 1, and the oscillating current of the building structure is reduced. It guides the remanence to demagnetization.

As shown in FIGS. 10 and 11, the shape of the demagnetizing coil 1 used at this time is such that the coil is arranged on a mold.

Since the demagnetizing coil 1 is made as large as possible with a diameter of, for example, about 1 m and the area covered is widened, the shape of the coil is slightly large and heavy at the same time. I felt it.

In a usual coil winding method, a winding frame is provided and the electric wire is wound. Therefore, when the coil becomes large, the winding frame for securing the rigidity of the coil also becomes large. Also, in order to reduce the resistance of the coil, it is desirable to make the wire thicker, so that the winding frame is devised by using a rectangular conductor.

In the example shown in FIG. 10, a bobbin-shaped demagnetizing coil 60 is formed, and an insulated conductor 62 is wound around a bobbin-shaped mold 61 having a predetermined height, and is disposed vertically. After filling without gaps between the flanges 63, 63, the surface is covered with a mold resin material.

In the example of the demagnetizing coil shown in FIG. 11, the demagnetizing coil 65 is formed in a flat shape, and is formed into a saddle-shaped winding frame 66 opening downward and forming a square shape. The formed insulating conductor is arranged and the gap with the winding frame is filled with an insulating resin material.

In the demagnetizing apparatus, increasing the magnetic field strength of the demagnetizing coil is related to increasing the size of the DC power supply, which increases the manufacturing cost of the entire demagnetizing apparatus and the construction cost due to power consumption. Because it is a factor,
The current demagnetization device can be expected to further reduce costs if the detailed relationship between the demagnetization device is examined in detail.However, regarding the residual magnetism of building structures, the factors and magnetized state cannot be specified. There are many unclear parts, and at present, prior to conducting such detailed investigations, we prioritize demagnetization, which is an urgent issue, and have not yet reached the stage of examining demagnetization means in terms of cost. , Has not been seen as a problem.

However, at the construction site of a building structure, since the residual magnetism of the reinforcing steel bar and the steel frame is not always generated, measures for demagnetization are not incorporated in the process, and the discovery of the residual magnetism is almost completed. In addition, locations where remanent magnetism occurs are widely dispersed.

From this, it is required to respond to the process in a short time. Since a power supply is obtained from an outlet of about 30 A, a large current cannot be expected. Since the device needs to be moved over a wide range, the corresponding device needs to be reduced in weight. Although it is necessary to respond promptly to such requests, the polarity of the remanent magnetism that appears on the surface of building structures depends on the remanent magnetism that partially magnetizes the steel frames and rebar laid inside the concrete. Since the demagnetization process cannot be simply performed because of the unification and manifestation of the demagnetization flux, the demagnetization process is performed many times by trial and error while changing the polarity and intensity of the applied demagnetizing magnetic flux.

Therefore, in spite of the above demands, it is necessary to reverse the set direction of the demagnetizing coil and perform the demagnetization again, which may take a long time for the demagnetization. In addition, there is a problem that a quick response cannot be taken, and it is required to shorten a construction period and reduce a construction cost.

[0030]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been proposed in order to solve the above problem. The present invention provides a demagnetizing coil of a demagnetizing device for a building structure capable of demagnetizing the residual magnetism at a construction site more quickly to shorten the construction period and reduce the construction cost.

[0031]

According to the present invention, a demagnetizing coil of a demagnetizing apparatus for a building structure according to the present invention is basically disposed on the surface of a building structure which emits obstructive magnetism and is provided with a residual magnetism of a ferromagnetic material. The demagnetizing coil of the building structure for demagnetizing the coil is composed of a rectangular conductor wound in a coil shape, an insulator interposed between the conductors and an insulator covering the square coil, Specifically, it is characterized in that the insulator is formed in a sheet shape, the insulator between the conductors is attached to the square conductor, or an insulating adhesive for joining the square conductor is used. .

Accordingly, the demagnetizing coil of the demagnetizing apparatus for a building structure according to the present invention can be easily handled while using a thick conductor to reduce the resistance so that a large current can flow. In order to do so, it is lightweight without using extra materials, and by making it a rigid structure so that extra energy is not consumed by suppressing vibration,
The demagnetization treatment of the residual magnetism at the construction site of the building structure is accelerated to shorten the construction period and reduce the construction cost. In addition, to reduce the weight of the coil, the inductance of the coil is increased to lower the frequency of the damped vibration magnetic field to improve the degaussing efficiency, and the uniform degaussing magnetic field is formed by enlarging the projected area of the coil. .

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A demagnetizing coil of a demagnetizing device for a building structure according to the present invention is arranged on the surface of a building structure that emits obstacle magnetism to demagnetize the residual magnetism of a ferromagnetic material. A rectangular conductor wound with a demagnetizing coil of a product,
It is composed of an insulator interposed between conductors and an insulator covering a square coil, the insulator is formed in a sheet shape, and the insulator between the conductors is attached to the square conductor. It is made of an insulating adhesive for joining the square conductor.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a demagnetizing apparatus for a building structure to which a demagnetizing coil according to the present invention is applied.

In the figure, 1 is a demagnetizing coil, 2 is a DC power supply, 3 is a connecting cable constituting a current circuit, 4
Is a magnetic sensor.

The demagnetizing coil 1 is manufactured in a light and rigid shape that can be easily carried to a place where residual magnetism is generated. For this purpose, the demagnetizing coil 1 is configured such that a cable is wound in a rectangular shape of about 1 m square so that a building structure requiring demagnetization can be covered in as wide a range as possible.

The demagnetizing coil 1 is supplied with a damped oscillating current from the DC power supply 2 to generate a damped oscillating magnetic field 5. The damped oscillating magnetic field 5 acts to demagnetize the residual magnetism 8 that is magnetized on the reinforcing bar 7 on the floor 6, thereby demagnetizing the residual magnetism generated on the floor.

The damped oscillating magnetic field 5 attenuates the remanence of the rebar with time to lead to a zero point in the magnetic flux density B-magnetic field H curve, and in some cases, the polarity of the maximum magnetic flux that the capacitor first discharges. , The polarity of the remanence is opposite to the polarity of the remanence, thereby effectively suppressing the remanence.

The demagnetizing coil 1 used in the demagnetizing device for a building structure is manufactured in a shape that can be quickly carried to a place where residual magnetism is generated and can be easily arranged.

For this purpose, as shown in a perspective view in FIG. 2, the demagnetizing coil 1 is formed by winding a conductor through which a damped oscillating current flows into a flat rectangular shape, and while maintaining sufficient rigidity and light weight. , The length (L) and the width (B) around which the conductor is wound,
The building is designed to cover a wide range of building structures that require demagnetization in the flat direction.

Details of the demagnetizing coil 1 will be described with reference to a partial perspective view of FIG. 3 and a sectional view of FIG.

In the present embodiment, the demagnetizing coil 1 is formed by winding a thick, non-insulated, thick rectangular conductor 10 in a multilayer shape, and increasing the cross-sectional area of the conductor to reduce the resistance. It is configured to allow a large current to flow and at the same time to ensure a predetermined rigidity while facilitating handling.

On the gap surface where each rectangular conductor 10 is adjacent,
As shown in FIG. 3, an insulating sheet 11 that can insulate each other in cooperation with an adhesive is attached, and
Are joined by an insulating adhesive 12.

Further, as shown in the partial perspective view of FIG. 4, the outer surface of the rectangular conductor 10 wound in a multilayer shape is formed by winding an elongated insulating sheet 13 so that the form is not collapsed. Reinforced.

As a result, the shape of the demagnetizing coil 1 complements each other together with the adhesive bonding the rectangular conductors 10 together, and achieves the required mechanical performance without using any extra reinforcing means. It is established with sufficient rigidity.

Accordingly, the demagnetizing coil 1 is used in a state in which a thick naked rectangular conductor is wound in multiple layers, and the outer surface is formed of an insulating sheet while insulating the conductors with an insulating sheet cooperating with an adhesive. The structure is designed to reinforce the wire so that it does not collapse. It has the desired electrical performance and structural strength while eliminating the use of formwork, and has sufficient rigidity to facilitate handling and generate a uniform magnetic field while significantly reducing weight. Is secured.

Since the demagnetizing coil according to the present invention is configured as described above, it is easy to handle by making it lightweight and rigid while forming a small resistor that allows a large current to flow. In addition, since vibration is suppressed to avoid consumption of extra energy, demagnetization processing of residual magnetism at the construction site of the building structure is speeded up, thereby shortening the construction period and reducing the construction cost.

As described above, the present invention has been described in detail based on the embodiments. However, the demagnetizing coil of the demagnetizing apparatus for a building structure according to the present invention is not limited to the above-described embodiment. Regarding the material, shape, etc. of the conductor, the insulating sheet, the adhesive, etc., without departing from the spirit of the present invention,
It goes without saying that various changes can be made by applying what is already known at the time of filing the application.

[0049]

According to the present invention, a demagnetizing coil of a demagnetizing apparatus for a building structure is provided on a surface of the building structure that emits obstacle magnetism to demagnetize the residual magnetism of a ferromagnetic material. The demagnetizing coil is composed of a rectangular conductor wound in a coil shape, an insulator interposed between the conductors and an insulator covering the square coil, and the insulator is formed in a sheet shape, Paste the insulator between the conductors to the square conductor,
Alternatively, it is characterized by being composed of an insulating adhesive that joins square conductors, so that demagnetization of residual magnetism at construction site construction sites can be accelerated, shortening the construction period and reducing construction costs In addition, the following effects are exhibited.

By using a thick conductor to reduce the resistance, a large current can be passed. It is easy to handle by reducing the weight without using extra materials. By reducing the weight of the coil, the inductance is increased to improve the degaussing efficiency, and a uniform degaussing magnetic field is formed by enlarging the projected area. The rigid structure suppresses vibration and avoids extra energy consumption.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a demagnetizing apparatus for a building structure to which a demagnetizing coil according to the present invention is applied.

FIG. 2 is a perspective view of a demagnetizing coil according to the present invention.

FIG. 3 is a sectional view of a demagnetizing coil according to the present invention.

FIG. 4 is a partial perspective view showing an exterior surface of a demagnetizing coil according to the present invention.

FIG. 5 is an explanatory diagram showing an AC demagnetization method applied to a conventional small device.

FIG. 6 is a schematic diagram showing a conventional permanent magnet demagnetization method applied to a building structure.

FIG. 7 is a schematic diagram showing a conventional AC demagnetization method applied to a building structure.

FIG. 8 is a schematic diagram of a circuit configuration of a proposed demagnetizing device for a building structure.

FIG. 9 is an explanatory diagram of a decay current in a proposed demagnetizing device for a building structure.

FIG. 10 is a schematic diagram of a demagnetizing coil in a proposed demagnetizing device for a building structure.

FIG. 11 is a schematic diagram of another demagnetizing coil in a demagnetizing device for a building structure that has already been proposed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Demagnetizing coil, 2 DC power supply, 3 Connection cable, 4 Magnetic sensor, 5 Damped oscillating magnetic field, 6 Floor surface, 7 Reinforcing bar, 8 Remanent magnetism of reinforcing bar, 10 Square conductor, 11 Insulating sheet, 12 Insulating adhesive, 1
3 insulating sheet, 21 demagnetizing coil, 22 object,
23 conveyors, 24 power supplies, 25 control devices,
26 alternating magnetic field, 27 magnetic flux density, 30 floor, 3
1 rebar, 32 remanent magnetism, 33 magnetic field, 34 permanent magnet, 35 deck plate, 40 demagnetizing coil,
41 AC power supply, 42 Current control device, 43 bogie, 44 Floor surface, 45 Remanent magnetism of rebar, 46 Steering control device, 47 Receiving antenna, 50 Capacitor, 51 Normal AC power supply, 52 Charge switch,
53 discharge switch, 54 current circuit, 55 delay coil, 56 damped oscillating current, 57 damped oscillating current with limited damping rate, 60, 65 demagnetizing coil, 61 formwork, 62 conductor, 63 flange, 66 winding frame,

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Akira Inubushi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation F-term (reference) 2E001 DH03 FA11 HA06 HE00 QA00

Claims (4)

[Claims] 1. A demagnetizing coil for a building structure, which is disposed on the surface of a building structure that emits obstructive magnetism and demagnetizes the residual magnetism of a ferromagnetic material, wherein the coil is wound in a rectangular shape. A demagnetization coil for a building structure demagnetization device, comprising: a body, an insulator interposed between the conductors, and an insulator covering the rectangular coil. 2. The demagnetizing coil according to claim 1, wherein the insulator is formed in a sheet shape. 3. The demagnetizing coil according to claim 1, wherein the insulator between the conductors is affixed to the rectangular conductor. 4. The demagnetization device for a building structure according to claim 1, wherein the insulator between the conductors is made of an insulating adhesive for joining the rectangular conductors. Magnetic coil.