JP2000005987A - Hollow tube body inner face polishing device and its oxidation corrosion preventing processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily polish and remove an oxidation corrosion portion generated on an existing hollow tube body inner face by connecting a hollow shaft and a compressed air pipe to jet the dust generated when the inner face is polished by a burnisher toward a hollow tube body upper opening hole. SOLUTION: A hollow tube body 1 penetrates an anchor 21 near an opened base end section and is buried and fixed by concrete 22, and a burnisher 2 provided at the tip section of a hollow rotary shaft 3 held by shaft guides 4 in the hollow tube body 1 is rotated and vertically slid by a drive device 7 to peel the dust stuck to the inner face of the hollow tube body 1. The burnisher 2 is operated while compressed air is jetted from a compressed air pipe 10 connected to the hollow rotary shaft 3 at the upper end section of the hollow tube body 1, and the peeled oxides are discharged to the outside from an upper end opening hole for polish cleaning. The drive device 7 is connected and held to the hollow tube body 1 by connecting metals 8 and is connected to the hollow rotary shaft 3 by a holding lever 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for polishing the inner surface of a hollow tube and a method for preventing oxidative corrosion of the hollow tube, and more particularly to a polishing apparatus for polishing and removing an oxidized and corroded portion of an inner surface of a buried and fixed hollow tube. The present invention relates to an inner surface oxidation / corrosion protection method or an inner surface oxidation / corrosion protection method which is performed in a factory or the like before construction.

[0002]

2. Description of the Related Art In a conventional hollow tubular body, it is difficult to use a hollow column as a support column by fixing a base end portion of the open state with concrete or the like and covering the other end with a head fitting or the like. Are known.

[0003]

As described above, the conventional hollow tube has a structure in which the base end in the open state is buried and fixed with concrete or the like, and is inserted into the hollow tube from the base end. The permeated outside air (moisture) etc. repeatedly causes a dew condensation phenomenon on the inner surface due to the change of the outside air temperature, oxidative corrosion progresses on the inner surface which can not be seen from the outside, breaks down with a slight external pressure, and has a serious effect on the human body There was a risk of damage.

The present invention has been made in view of the above-mentioned problems of the prior art, and in an existing hollow tube inner surface polishing apparatus, a hollow rotary shaft having a polishing tool attached to a tip end thereof and a drive shaft are provided. Provided is an apparatus for polishing the inner surface of a hollow pipe provided with the apparatus and a compressed air pipe.

[0005] In the existing method of oxidizing and protecting the inner surface of a hollow tube, the oxide removed by polishing with the above-mentioned polishing tool is removed from the inside of the hollow tube, and then a plug is hardened with an adhesive injected into the bottom thereof. After spraying a flame-retardant rust preventive on the entire inner surface with a spray, coating the upper end opening with a washer with high pressure with a bolt and nut, sealing and sealing the surface with an adhesive to cover the inner surface of the hollow tube Provide an oxidation corrosion prevention processing method.

Further, in the method of oxidizing and preventing corrosion of the inner surface of the hollow tube before the hollow tube body is constructed, a flame-retardant method is used in which lids are fixed to and sealed at both ends of the degreased hollow tube. Provided is a method for preventing oxidative corrosion of the inner surface of a hollow tube in which a rust inhibitor is flown, coated on the entire inner surface, and sealed.

Further, by heating the hollow tubular body at a predetermined temperature during the coating step, the flame-retardant rust preventive is vaporized (gasified), and due to the heating pressure, poor sealing at the time of closing the upper and lower lids is difficult. Provided is a method for preventing oxidative corrosion of the inner surface of a hollow tube, which maintains a sealing property by press-fitting a flammable rust inhibitor.

[0008]

In order to achieve the above object, in an apparatus for polishing the inner surface of a hollow tube according to the present invention, an abrasive is attached to a lower end of a hollow shaft having a driving groove in the hollow tube. A polishing tool is provided, and a driving device that rotationally drives the polishing tool and a connection fitting that connects the hollow tube are provided. The dust whose inner surface is polished by the polishing tool is sprayed toward the upper opening of the hollow tube. A hollow shaft and a compressed air pipe are connected to each other.

In order to achieve the above-mentioned object, in the method for oxidizing and protecting the inner surface of a hollow tube according to the present invention, after polishing the inner surface with the above-mentioned polishing tool, an adhesive is injected into the bottom of the hollow tube and a plug is inserted. After spray coating with a flame-retardant rust preventive with a spray that has been firmly attached and inserted into the hollow tube, the packing material fitted on the upper part of the hollow tube is strongly expanded with a bolt and nut and sealed, and the surface is sealed with an adhesive This is to prevent the occurrence of dew condensation and the like in the hollow tubular body by coating with a multilayer.

In order to achieve the above object, according to the present invention, one end of the hollow tube is fixedly closed with a lid after degreasing the inside surface of the hollow tube when oxidative corrosion is prevented in a factory or facility. After injecting a room temperature flame-retardant rust preventive agent from the opening at the other end and closing the lid, the hollow tube is swung while rotating, and the entire inner surface is coated with the flame-retardant rust preventive agent and sealed, or After injecting a flame-retardant rust preventive at room temperature, it is heated at a predetermined temperature during coating to evaporate and fill the hollow tube with gas, and the rising pressure of the heating causes the flame-retardant rust to the poorly sealed part when the upper and lower lids are closed. It is intended to prevent the occurrence of dew condensation and the like in the hollow tube body by press-fitting the agent to maintain the airtightness.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. Referring to FIG. 1, a polishing apparatus 2 for polishing the inner surface of a hollow tube according to the present invention includes a polishing tool 2 having a spirally or cylindrically mounted abrasive, and a hollow rotary shaft 3 having a driving groove 5.
The shaft guide 4 is fitted at an appropriate position so that the hollow rotary shaft 3 does not run out, etc.
A configuration is such that a compressed air pipe 10 from a compressor is connected at an upper end portion via a driving device 7 having a rotation drive transmission mechanism of an electric motor 6 (for example, a gear mechanism (not shown) meshing with a worm gear and a worm wheel).

The hollow tubular body penetrates the anchor 21 near the base end of the opening and is buried and fixed with concrete 22.
The polishing tool 2 provided at the tip of the hollow rotary shaft 3 held by the shaft guide 4 in the hollow tubular body 1 rotates and slides up and down to peel off dust adhering to the inner surface of the hollow tubular body 1. When the polishing tool 2 is operated as described above while the compressed air is jetted from the compressed air pipe 10 connected to the hollow rotary shaft 3 at the upper end of the hollow tubular body 1, the separated oxide is discharged to the outside through the upper end opening and the polishing is performed. Cleaning is performed. The driving device 7 is connected to the hollow tube 1 by the connection fitting 8.
And is connected to the hollow rotary shaft 3 by a holding rod 9.

Referring to FIG. 2, a method of oxidizing and preventing corrosion of a hollow tube already buried and fixed is performed by hollow tube 1 whose inner surface is polished and cleaned.
A spherical plug 11 is hardened and fixed to the bottom with a predetermined amount of an adhesive 12, and the entire inner surface thereof is sprayed with a flame-retardant rust preventive 18 by a spray (not shown), and the upper and lower washers 1 are coated.
The upper end opening of the hollow tube 1 is closed and sealed with a packing material 13 which is strongly pressed and expanded by a bolt 15 and a nut 16 which are clamped by 4 and inserted into a central through hole 17, and the upper portion thereof is stopped by an adhesive 12. The outside air (moisture) is shut off by a sealing method, and the hollow tube 1
The flame-retardant rust preventive 18 enclosed in the inside prevents oxidation corrosion of the inner surface.

FIGS. 3A and 3B show another embodiment of the present invention, that is, an example of a method of oxidative corrosion prevention performed before the hollow tube 1 is buried. )), A small-diameter bottom cover 19 is closed at one end of the hollow tubular body 1a whose inner surface has been degreased, and a flame-retardant rust preventive 18 is injected into the inside through the opening at the other end. The hollow tube 1a is swung right and left while rotating to coat the entire inner surface with the flame-retardant rust preventive agent 18, and covers the poorly sealed portions when the upper and lower covers 19 and 20 are closed. Hollow tube 1a in which the outside air (moisture) is blocked by a sealing method
Is buried and fixed with concrete 22 and the other end is covered with a metal fitting or the like so that it can be used semi-permanently as a pillar or the like.

In FIG. 3 (b), one end of the hollow tube 1a whose inner surface has been degreased is closed with a slightly larger bottom cover 19, and the other end is provided with a flame-retardant rust inhibitor through the opening. After injecting 18, after closing the upper lid 20, the hollow tube 1 a is swung right and left while rotating at a predetermined temperature by a heater 23 to coat the flame retardant rust preventive 18 on the entire inner surface. At the same time, the flame-retardant rust preventive agent 18 is vaporized (gasified) by heating, and the flame-retardant rust preventive agent 18 is press-fitted into a poorly sealed portion when the upper and lower lids 19 and 20 are closed with a pressure filled therein. While blocking the outside air (moisture)
A hollow tube 1a formed by a method of preventing oxidative corrosion of the inner surface by the filled gas and having one side buried and fixed with concrete 22 and covered with metal fittings on the other end and can be used semi-permanently as a pillar or the like. It is.

[0016]

Since the present invention is configured as described above, the following effects can be obtained.

Polishing and removal of the oxidized and corroded portion generated on the inner surface of the existing hollow tube and its oxidative corrosion prevention process can be easily performed in a fixed state, and recurrence of oxidative corrosion can be prevented to semi-permanently support columns and the like. Can be used as

The hollow tube body can be semipermanently used by preliminarily burying and fixing the inside of the hollow tube inside the factory or facility, etc., without the necessity of re-polishing using the inner surface polishing device after the burial is fixed on site. Therefore, durability can be maintained and safety can be increased and secured.

Further, the present invention can be applied to general amusement equipment such as physical education equipment and swings, and hollow pipes used for pillars such as signboards, signs, protective fences, sheds and the like which are installed outdoors, and has great versatility.

[Brief description of the drawings]

FIG. 1 is a sectional side view of a main part of an internal polishing apparatus showing a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part showing an inner surface oxidation / corrosion protection process of an existing hollow tubular body according to the present invention.

FIG. 3 is a partial cross-sectional side view showing each embodiment of another corrosion prevention processing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Hollow tubular body 2 Polishing tool 3 Hollow rotating shaft 4 Shaft guide 6 Electric motor 7 Drive device 10 Compressed air pipe 11 Spherical plug 13 Packing 14 Washer 18 Flame retardant rust inhibitor 19 Bottom cover 20 Top cover 23 Heater

Claims (3)

[Claims] 1. A polishing tool in which a polishing material is attached to a lower end portion of a hollow shaft having a driving groove in a hollow tube, wherein the polishing device has an opening-like base end portion embedded and fixed in concrete. A driving device that rotationally drives the polishing tool and a connecting metal fitting that connects the hollow tube body, and the dust whose inner surface is polished by the polishing tool is blown up toward the hollow tube upper opening hole. A hollow pipe inner surface polishing device that connects a shaft and a compressed air pipe. 2. In the existing method of preventing oxidation of the inner surface of the hollow tube, the inner surface of the hollow tube is polished with the above-mentioned polishing tool, an adhesive is injected into the bottom of the hollow tube, and a plug is inserted into the hollow tube to harden the tube. After spraying a flame-retardant rust inhibitor with a spray penetrated into the body, coating the packing material fitted to the upper part of the hollow tube with pressure and expansion with a bolt and nut, sealing it, and coating the surface with an adhesive to cover the hollow layer. A method of preventing oxidative corrosion of the inner surface of a hollow tube that prevents the occurrence of dew condensation and the like inside the tube. 3. In the method for preventing oxidative corrosion of the inner surface of a hollow tube, when performing the oxidative corrosion preventive process in a factory or facility, one end of the hollow tube is closed after degreasing the inner surface of the hollow tube. After fixing, inject a normal temperature flame-retardant rust preventive agent from the opening at the other end, close the lid, and swing the hollow tube while rotating it to coat the entire inner surface with the flame-retardant rust preventive agent and seal it. Alternatively, after injecting a flame-retardant rust preventive at room temperature, it is heated at a predetermined temperature during coating and vaporized to fill the inside of the hollow tube with gas. A method for preventing oxidative corrosion of the inner surface of a hollow tube in which a rust agent is press-fitted to maintain the airtightness and prevent the occurrence of dew condensation and the like in the hollow tube.