JP2000208326A - Truck for demagnetizing architecture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently demagnetize a magnetized part of a slab, with a simple device. SOLUTION: With a truck 6 provided on a slab 5 for allowed movement and four demagnetizing coils 1-4 placed on the truck 6 provided, the demagnetizing coils 1-4 comprise rectangular parallelopipeds and the size in top view is matched with bararrangement pitches L1 and W1 in the slab, while the demagnetizing coils 1-4 are connected in series so that the generated the magnetic fields have the same orientation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a degaussing trolley for demagnetizing a magnetized portion in a reinforced or steel-framed concrete building.

[0002]

2. Description of the Related Art During the construction of a building, a magnetic body such as a steel frame or a reinforcing bar in a slab is locally magnetized and remains as residual magnetism, and this magnetized portion is found after the building is completed. There are cases. The remanence is 1-2
Gaussian (G) may also occur, causing OA equipment to malfunction due to the influence of the magnetic environment, causing a color shift on the CRT display of the computer, garbled information therein, and the like, resulting in system reliability. And seriously affect operations. In order to solve this problem, it is conceivable to repair the magnetized portion by destroying it. However, there is a problem in the strength of the building, and no effective measures have been taken so far to solve this problem.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a building degaussing cart capable of efficiently demagnetizing a magnetized portion of a slab with a simple device.

[0004]

In order to achieve the above object, the invention according to claim 1 comprises a truck 6 movably disposed on a slab 5 and four trucks mounted on the truck. 3. The degaussing coil according to claim 2, comprising: degaussing coils 1 to 4, wherein the degaussing coil is formed of a rectangular parallelepiped, and the size in plan view is adjusted to the rebar pitches L1 and W1 of the reinforcing bars 7 in the slab. The invention is characterized in that, in the first aspect, the degaussing coils are connected in series such that generated magnetic fields are in the same direction. It should be noted that the numbers added to the above configuration are compared with the drawings to facilitate understanding of the present invention, and the present invention is not limited thereto.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of a building degaussing cart according to the present invention, wherein FIG. 1 (A) is an overall side view, FIG. 1 (B) is a plan view of FIG. 1 (A), and FIG.
2C is a perspective view of the degaussing coil, FIG. 2A is a diagram showing a method of connecting the coils of FIG. 1, and FIG. 2B is a diagram for explaining the degaussing method.

In FIG. 1A, a carriage 6 made of a non-magnetic material is arranged on a slab 5. 4 on the trolley 6
Two demagnetizing coils 1 to 4 are provided. The height of the carriage 6 is set so that the distance between the reinforcing bar 2 and the degaussing coils 1 to 4 is within 100 mm. For this purpose, the axis of the wheel 6a is arranged upward.

[0007] As shown in FIG.
The sizes W1 and L1 of the degaussing coils 1 to 4 in plan view are set to match the arrangement pitch of the reinforcing bars 7. As shown in FIG. 1C, the demagnetizing coils 1 to 4 are made of a magnetic material and a rectangular upper plate a and a lower plate b are formed by a rectangular parallelepiped core c in order to efficiently demagnetize a reinforcing bar or a steel frame instead of a circular shape. The electric wire d is wound around the iron core c in connection.

As shown in FIG. 2A, the demagnetizing coils 1 to 4 are configured such that four coils are connected in series as one circuit to generate magnetism in the same direction. The degaussing coils 1 to 4 are connected to a current control device 9 for controlling the strength of a magnetic field generated by the coils, and the current control device 9 is connected to an AC power supply 10.

Then, as shown in FIG. 2 (B), an alternating current is applied to the degaussing coils 1 to 4 and the current controller 9 controls the magnetic field strength H so as to gradually decrease, thereby reversing the magnetization curve. The residual magnetism B is reduced by a method of following the loop.

[0010]

As is apparent from the above description, according to the present invention, the magnetized portion of the slab can be efficiently demagnetized by a simple device.

[Brief description of the drawings]

1 shows an embodiment of a building degaussing cart according to the present invention, FIG. 1 (A) is an overall side view, and FIG. 1 (B) is FIG.
FIG. 1A is a plan view, and FIG. 1C is a perspective view of a degaussing coil.

FIG. 2A is a diagram illustrating a method of connecting the coils of FIG. 1, and FIG. 2B is a diagram illustrating a demagnetizing method.

[Explanation of symbols]

 1-4 degaussing coil 5 ... slab 6 ... bogie 7 ... rebar

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Noboru Ishikawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation F-term (reference) 2E001 DH03 FA24 HA04 QA00 2E174 AA03 CA24 EA08

Claims (2)

[Claims] 1. A truck movably disposed on a slab,
And four degaussing coils mounted on the trolley, wherein the degaussing coils are formed of a rectangular parallelepiped, and the size in plan view is matched to the reinforcing bar pitch of the reinforcing bars in the slab. Trolley. 2. The degaussing coil according to claim 1, wherein the degaussing coils are connected in series such that generated magnetic fields are in the same direction.
The described building degaussing trolley.