JP2010106649A - Method of performing anticorrosion treatment to fix post, and cylindrical sleeve for use in anticorrosion treatment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of fixing a post into a burying hole while preventing corrosion of a steel pipe used as the post of a guardrail. <P>SOLUTION: A base part 11 of the steel post 1 is buried and fixed into the ground after applying anticorrosion treatment to the base part. As the anticorrosion treatment, the base part is covered with a cylindrical plastic sleeve 6 through an adhesive sheet 5, and a cap 7 made of rubber with high weather resistance is put on the upper part of the cylindrical sleeve. The inner diameter of the rubber cap is smaller than the outer diameter of the post, and when put on, the upper end of the rubber cap is directly brought into close contact with the post to prevent infiltration of rainwater between the post and the cylindrical sleeve while holding down the upper part of the cylindrical sleeve. Burying is carried out by putting the corrosion-treated post in the burying hole provided beforehand, filling sand 4 around leaving 1-5 cm from the ground surface, and then filling cement mortar 3 on top of the sand for fixing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention is made of steel pipes, such as guardrail struts provided on the sides of roads and bridges, and the base part of which is embedded in the soil or embedded in a concrete structure. The present invention relates to a technique for fixing a support column by performing an anticorrosion treatment in order to cope with the problem of corrosion with the passage of the moon. The present invention also relates to a cylindrical sleeve used for the anticorrosion treatment. The present invention is not limited to a case where a support column is newly installed, but can also be applied to a case where the existing support column is fixed again after performing anticorrosion after installation.

For example, guardrails provided on both sides of a highway or on a median strip have a structure in which a strip-shaped steel plate is formed and supported with standing columns for each predetermined length. This support column is made of a cylindrical steel tube with a diameter of 14 cm inside or outside, or a rounded square tubular steel tube with a side of about 12.5 cm, and a top is covered with a cap. The length of the column varies depending on the place of use. Normally, when the base is buried in the soil like a normal road, the total length is 110 cm, and there is no soil layer like a bridge, and the entire base is a concrete structure. When embedded in an object, the total length is 95 cm. As shown in FIG. 1, in the case of embedding underground, as shown in FIG. 1, the base of the strut (1) is embedded in the embedding hole (2) having an inner diameter of about 20 cm provided in the concrete pavement. Insert (11), place asphalt or cement mortar (3) around the lower end (12), fill the surrounding voids with sand (4) to the ground surface (GL), and finally In addition, a method of covering and fixing the vicinity of the ground surface of the support with asphalt or cement mortar (3) again is employed.

When the place where the support is provided is a concrete structure such as a bridge part, the embedding depth of the support cannot be taken deep, and it stops at about 25 cm. In this case, the above-described method of filling the sand is not adopted, and the cement mortar is simply filled around the support in the buried hole. In some cases, a method of holding the column in a position to be fixed, placing concrete around the column, and fixing the column simultaneously with the construction of the concrete structure may be employed.

It has been experienced that the struts fixed as described above rust in a few years or months in the early years, whether in the ground or in a concrete structure. If it is underground, rust occurs in the range from about 20 to about 40 cm in the case of deep, from the vicinity of the buried ground surface downward, and corrosion is not seen much in a deeper part than a certain range. It is understood that the mechanism of this corrosion is because the perimeter of the column at this position is moistened due to the penetration of rainwater, and a macrocell phenomenon occurs where a local battery is formed, causing current to flow or stray current to flow. Yes. Conventionally, as a countermeasure, painting has been performed on the support column, but it has not been effective and a drastic solution has been demanded. The same problem is common not only when installing guard poles, but also when installing steel pipe poles for various purposes.

One of the inventors looked for a way to more effectively cope with the problem that the base of the embedded support column corrodes, and the support column was coated with an adhesive sheet such as unvulcanized butyl rubber. Inventing a fixing method in which an anticorrosion treatment of covering with a cylindrical sleeve made of plastic is applied and then embedded is proposed (Patent Document 1). In order to prevent rainwater from seeping between the column and the plastic cylindrical sleeve when this proposed column fixing method is used, a caulking material such as silicone rubber for building construction is applied to the upper end of the anticorrosive part. Take measures to fill. However, filling the caulking material is a manual operation and requires a certain level of skill, and there is a problem that a certain effect is not always obtained. Therefore, where corrosive conditions are severe, a rainwater permeation countermeasure that can be easily constructed and has a certain effect is required instead of filling the caulking material. Furthermore, since the portion of the cylindrical sleeve exposed above the ground surface is deteriorated by the action of ultraviolet rays, oxygen, ozone, etc., there remains a problem of how to prevent it. Beside the road, it is known that the ozone contained in the exhaust of the automobile acts and the plastic material is easily deteriorated.
Japanese Patent No. 4211870

The object of the present invention is to further advance the technique for fixing the column by preventing the corrosion often caused in the steel tube column, which has been proposed earlier, in order to prevent rainwater permeation between the column and the plastic cylindrical sleeve. An object of the present invention is to provide a method of using a rubber cap as a method of fixing a support column which can be carried out instead of filling a caulking material and has a measure that is easy to construct and has a certain effect. Providing a rubber cap for this purpose is also included in the object of the present invention.

The fixing method of the support of the present invention is
In the method of fixing the support by embedding the base of the steel support in the ground with the anti-corrosion treatment applied to the base, as shown in FIG. 2, the anti-corrosion treatment to the base (11) of the support (1) is performed. And covering with a plastic cylindrical sleeve (6) through an adhesive sheet (5), and covering the upper part of the cylindrical sleeve with a rubber cap (7). The length of the cylindrical sleeve is: The upper end is located at a height of 1 to 5 cm above the portion that intersects the ground surface (GL) when the column is buried, and the lower end is located at a depth of 25 to 45 cm below, as shown in FIG. The rubber cap caps the upper end (71) directly against the column to prevent rainwater from seeping between the column and the cylindrical sleeve, and the body (72) adheres to the upper part of the cylindrical sleeve. Adhere to the sheet (5), and Is intended to suppress the deterioration over the top of the chromatography Bed,
The burial is placed in a burial hole that has been subjected to anti-corrosion treatment, and the vicinity of the lower end (12) is fixed with asphalt or cement mortar (3), leaving 1-5 cm from the ground surface. After the sand (4) is filled, asphalt or cement mortar (3) is filled and fixed on the upper part of the sand.

Another aspect of the fixing method of the support according to the present invention is a method of fixing the support by embedding the base of the steel support in the concrete structure, not in the soil, by subjecting the base to anticorrosion treatment. As shown in FIG. 2, the anticorrosion treatment is covered with a plastic cylindrical sleeve (6) through an adhesive sheet (5), and a rubber cap (7) is placed on the upper part of the cylindrical sleeve. The length of the cylindrical sleeve is located at a height of 1 to 5 cm above the portion where the upper end intersects the ground surface (GL) when the column is embedded, and the lower end is the lower end of the column (12 ), And the upper end portion (71) is in direct contact with the support column to prevent rainwater from entering between the support column and the cylindrical sleeve, and the main body portion (72). ) Adhesive sheet (upper part of cylindrical sleeve) ) In brought into close contact, and those having a suppressing shape deterioration over the top of the tubular sleeve, in that is not different from the case of buried in the ground above, buried,
(I) Put the anti-corrosion support strut in the buried hole (2) provided in the concrete structure in advance and fill it with asphalt or cement mortar (3) and fix it, or
(B) The pillars subjected to the anticorrosion treatment are fixed by constructing the concrete structure by placing the concrete in a state where it is held in a predetermined position.
This is a support fixing method different from the above method in that it is any of the above.

If the column is fixed by preventing the corrosion by the fixing method of the present invention, the outer surface of the portion where the column is likely to be corroded is covered with a plastic cylindrical sleeve and kept in an electrically non-conductive state. Therefore, no current is generated due to the formation of the local battery, and electrochemical corrosion can be almost completely prevented. On the other hand, rainwater that may permeate between the column and the cylindrical sleeve is prevented from permeating by the rubber cap and flows down to the surroundings, so that the anticorrosion is perfect. Since the plastic cylindrical sleeve is covered with a rubber cap at the top and is not affected by ultraviolet rays, atmospheric oxygen, ozone, or the like, deterioration can be prevented. Various additives have been developed and used in order to prevent the deterioration of the plastic, but it is more advantageous to select rubber than plastic in terms of weather resistance. Corrosion of the other part of the support is in time with normal corrosion protection means such as galvanization or painting, so that the corrosion of the steel pipe support as a whole can be reduced to be substantially zero.

The method of fixing the column of the present invention is not limited to the case where it is newly fixed, whether it is embedded in the concrete structure or whether the base of the column is embedded in the soil. It can also be applied to re-fixing to prevent corrosion. For example, if the base is buried in the soil, the concrete or asphalt that secures the base of the column is removed from the buried hole dug in the ground, and then filled around the base of the column In the state where water is poured into the slurry that has been poured into the slurry, the support is taken out by removing the sand once, and subjected to anticorrosion treatment by placing a plastic cylindrical sleeve on the adhesive sheet, and again After putting it in the burial hole and putting sand, it is filled with concrete or asphalt and fixed.

If the base of the column is directly embedded in the concrete structure, it is impossible to make the column free by washing out the sand, so you can only pull out the column forcibly with a hydraulic jack. Drawing is not a very difficult task according to our experience. The concrete around the column is partially destroyed and adheres to the column base, but after removing it, the above-mentioned anticorrosion treatment is applied, placed in its original position, and the periphery is fixed with mortar. Just follow. Such an operation can be carried out as an anti-corrosion treatment at the occasion of some repair or even when no repair is necessary, and can demonstrate the effect of the corrosion prevention by the above-described mechanism. If it is possible to remove the connection between the support column and the guard rail, the anti-corrosion treatment can be performed on each support column without affecting the guard rail that was supported by the support column. Can be done.

FIG. 3 shows an aspect in the case where the base portion of the support column is embedded in a concrete structure such as a bridge in the fixing method described above. The entire embedded portion of the support column (1) is made of plastic. 2 is basically the same as the embodiment shown in FIG. 2 until it is covered with the cylindrical sleeve (6) and inserted into the embedding hole (2). Subsequently, cement mortar is filled around the base and fixed. When fixing the struts simultaneously with the construction of the concrete structure, the concrete may be placed in a state where the struts are held at positions to be fixed by some means.

When the fixing method of the present invention is used, the rubber cap prevents rainwater from penetrating between the column and the plastic cylindrical sleeve, but after the base portion is buried, FIG. As shown in the above, it is preferable to form an inclined surface by applying a frustoconical shape (8) with cement mortar around the rubber cap. By adding this step, rainwater is removed without penetrating around the base of the column, and the anticorrosion environment is further improved. Regardless of whether (8) is applied (Fig. 2) or not (Fig. 3), the lower end of the rubber cap has a height almost matching the ground surface (GL), and a plastic cylindrical sleeve is used for sunlight. It is preferable not to touch the atmosphere.

Various aspects of the cylindrical sleeve made of plastic are shown. In the case where the cross section of the column is cylindrical, a cylindrical cutting line is opened by providing a single cutting line that runs vertically in the cylinder, and the cutting end is butted against the cylinder. First of all, there is a structure that completes. Such a product can be produced by a single molding of the plastic forming the sleeve, for example by injection molding, or by the production of a cylinder by extrusion and subsequent cutting. In this cylindrical sleeve, as shown in FIG. 4, the cut ends (61, 62) to be abutted of the plastic cylindrical sleeve (6) are cut off obliquely, and have an overlapping shape when they are abutted. Those are preferred.

As another aspect of the plastic cylindrical sleeve, there may be a combination of a cylindrical cylinder cut by two cutting lines that run vertically to form a semi-cylindrical shape. Such a product can also be manufactured by plastic injection molding or a combination of extrusion molding and cutting processing, similar to the above-described product in which one cutting line is provided in the cylinder.

Even in the case where the cross section of the column has a rectangular tube shape, the plastic cylindrical sleeve for covering the column applies to all the cases described above for the cylindrical case. That is, as a cylindrical sleeve, it is possible to provide a structure in which a single cutting line that runs vertically through a square tube is provided to open an annular cross section and the cut ends are butted to complete the square tube. It is also possible to make a structure in which a half tube is formed by dividing it into two, and a rectangular tube is completed by abutting them.

Another way to produce a plastic cylindrical sleeve is to start with a plate. For example, a polyolefin resin such as polyethylene or polypropylene is thermoplastic and can be bent into a cylindrical shape by heating. As a more efficient method, there is a processing method in which a polyolefin resin plate is held on a pair of rolls. At this time, one roll is a flat roll, but the other roll uses only a pair of rolls in the form of a tooth-shaped roll in which a large number of protrusions parallel to the axis are present on the surface at a predetermined interval. When a large number of shallow grooves parallel to are formed, the plate-like body is curved with the grooved surface facing outside, and a cylindrical body is naturally formed. The diameter of the formed cylindrical body can be controlled within a certain range by adjusting the interval and depth of the grooves to be formed.

The above method is suitable when the cylindrical sleeve is cylindrical. However, in order to manufacture a rectangular tube-shaped sleeve, a group of ridges parallel to the axis is used as the other roll. It will be readily understood that what exists at appropriate intervals may be used. However, more advantageous is a manufacturing method using a press having a die in which an appropriate number of parallel protrusions are arranged. When such a press is used, it is possible to cope with a certain degree of change with the same equipment by changing the pressing interval according to the size of the square tube. Starting from a plate-like body is advantageous for injection molding in that when a long cylindrical sleeve is manufactured, a desired length can be formed at a time. Plastic plate-like bodies of various thicknesses are commercially available as a standard product having a size of 1 m × 2 m, for example, and are easy to obtain. Recommended as a manufacturing method that does not cost.

Any material can be selected as the material of the plastic cylindrical sleeve (6) as long as it is a weather-resistant plastic. Particularly suitable is a polyolefin such as polyethylene or polypropylene. For example, when manufacturing a cylindrical sleeve provided with one cutting line in the above length, these plastics can utilize the appropriate elasticity of the material in the operation of covering the base of the support with the adhesive sheet wound thereon. it can.

As the material of the pressure-sensitive adhesive sheet, unvulcanized butyl rubber is optimal. A sheet having release paper on the surface of a sticky sheet is commercially available and can be used conveniently.

The material of the rubber cap (7) is required to have excellent weather resistance. Several types of weather-resistant rubbers are known, including nitrile rubber, but EPT rubber (ethylene / propylene / terpolymer rubber) was the best in our experience. The shape and dimensions are slightly smaller (typically about 10% as seen in the examples described later) so that the inner diameter of the upper end portion (71) is in close contact with the outer diameter of the support column during construction. This is also made slightly smaller so that the inner diameter of (72) becomes the diameter obtained by adding the sum of the thickness of the adhesive tape and the thickness of the cylindrical sleeve to the outer diameter of the column. The molding method is arbitrary, and injection molding is optimal, but press molding can also be used.

In carrying out the fixing method of the support of the present invention, one side of the double-sided pressure-sensitive adhesive sheet is attached to the inside of the plastic cylindrical sleeve (6) used for the anticorrosion treatment of the support, and the other side. It is convenient to prepare a sheet to which a release paper is applied in advance. This cylindrical sleeve is made of an elastic plastic material, typically made of polyolefin, so that even if it has a structure cut by one line, it is spread out as described above, and the base of the column is formed. Since it can be coated, the anticorrosion treatment can be carried out very efficiently.

[Example 1]
A rubber cap having a shape shown in FIG. 5 and used for a cylindrical steel pipe column was manufactured by injection molding using EPT rubber as a material. The inner diameter of the upper part of this rubber cap is about 10% smaller than the outer diameter of 143 mm of a cylindrical steel pipe commonly used for the column, and it is designed to be stretched by covering the column base and to be in close contact with the column. Yes. The height is 70 mm. The inner diameter of the main body excluding the upper part is about 5 mm larger than the upper part, and is adapted to receive an adhesive sheet and a sleeve.

On the other hand, a plastic sleeve having a shape as shown in FIG. 4 was manufactured by injection molding of polypropylene. In other words, a cutting line that runs vertically in a cylinder is inserted, and the end of each butt is cut off. When it is placed on a column, the cut parts overlap to form a cylindrical coating. It is a thing. The dimensions of this sleeve when the cylinder is completed are an inner diameter of 143 mm (wall thickness of 2.0 mm) × length of 200 mm. Inside this plastic cylindrical sleeve, a double-sided pressure-sensitive adhesive sheet which was made sticky with unvulcanized butyl rubber, and a release paper was pasted on one side.

This is a steel pipe guardrail strut, a cylinder with an outer diameter of 139.8 mm (wall thickness: 4.5 mm) x length of 1100 mm, and a round lid is welded to one end (the top), and the whole is painted. The above-mentioned object was subjected to anticorrosion treatment using the rubber cap and the cylindrical sleeve. The release paper was peeled off and affixed with two cylindrical sleeves having a length of 50 mm from the end of the column base at the lower end at a position 50 mm above. Next, cover the top of the cylindrical sleeve affixed to the column with a rubber cap to stop the upper part of the anticorrosion treatment and fix the upper part of the cylindrical sleeve, as well as deterioration due to UV irradiation and contact with the atmosphere. Prevented.

Prior to placing concrete on the road surface, a column with a hollow tube with an approximately square cross-section spirally wound on a cylindrical outer surface with an outer diameter of 200 mm prepared by extruding plastic is embedded in the column. The inner diameter is about 200 mm x depth by placing the spiral hollow tube after concrete placement and hardening and creating a gap between the mold and the concrete solidified body. A 400 mm-long support hole was provided.

Insert the pillars with anti-corrosion treatment into the above burial holes, pour mountain sand into the gap of about 30mm in width around the pillars, and apply vibration with a small vibrator to spread the sand evenly. It was. The upper surface of the sand was 50 mm from the entrance of the buried hole. Cement mortar was filled in a portion of the burial hole where sand was not present, and a cone-shaped extra embankment was applied by ironing the cement mortar. The extra filling was performed so that the gradient was approximately 1/10 with respect to the expansion of about 10 cm outside the rubber cap. Accordingly, the rubber cap had a cross-sectional structure shown in FIG. 2 with its lower end approximately 1 cm buried in concrete.
[Example 2]

When the guardrail was newly installed at the bridge, work was done to fix the column. As a support, a rounded square tube (wall thickness: 6.0 mm) with a side of 12.5 cm is used, and a steel tube with a length of 95 cm is used. At one end (becomes the top), a shape corresponding to the cross section of the square tube is used. A square lid was welded and the whole was painted. The rubber cap has a shape corresponding to the outer diameter of the support column, but the size is 10% smaller than that. The height is 70 mm, which is the same as that used for the cylindrical support prepared in Example 1. The sleeve is a rounded square cylinder with a side of 13.2 cm (wall thickness 2.0 mm), and cuts two types of square cylinders of length 100 mm and 200 mm with two lines running vertically, Two U-shaped cross-section parts are used.

In the same manner as in Example 1, except that the steel pipe support base was covered from the lower end with the above-mentioned two types of rectangular sleeves side by side, and the rubber cap was put on. A column was placed in the embedding hole, and the periphery was filled with mortar to fix the base, and in the same manner as in Example 1, the surrounding area was overfilled. The depth buried below the ground surface was 25 cm, and the lower 1 cm of the rubber cap was also hidden in the concrete.
[Example 3]

The same steel pipe guardrail struts used in Example 1, which were buried and fixed as they were, were subjected to the work of fixing again after implementing measures for preventing corrosion. The asphalt at the top of the buried hole and covering the ground surface of the column was removed to expose the sand. While pouring water, the resulting slurry was sucked with a small slurry pump and removed from the hole. In this way, the periphery of the portion of the support base that was surrounded by asphalt and sand in the buried hole was made free, cleaned and dried. The slurry was solid-liquid separated, dried and reused. The following was carried out similarly to Example 1, and embedded the support | pillar which performed the anticorrosion process, and fixed the base.
[Example 4]

The guardrail support fixed in Example 2 was fixed simultaneously with the construction of the bridge by placing concrete. The concrete is cast in a state where it is held in a position to be fixed by suspending the post subjected to the anticorrosion treatment of Example 2 with a temporary fixing jig extending from the concrete casting mold. Was constructed and the struts were fixed.

Sectional drawing of the embedding part which shows the method of embedding and fixing the base of the conventional guardrail support | pillar. It is one Example of this invention, Comprising: The longitudinal cross-sectional view which shows the structure of a support | pillar base when preventing a corrosion and fixing a guardrail support | pillar. It is another Example of this invention, Comprising: The longitudinal cross-sectional view similar to FIG. 2 which shows the structure of a support | pillar base when preventing a corrosion and fixing a guardrail support | pillar. The perspective view which shows a typical aspect about the sleeve made from plastic used for the method of this invention. It is a figure which shows an example of the rubber-made caps used for the method of this invention, Comprising: A is a top view, B is a longitudinal cross-sectional view.

DESCRIPTION OF SYMBOLS 1 Support | pillar 11 Base of support | pillar 12 Lower end of support | pillar 2 Buried hole 3 Asphalt or cement mortar 4 Sand 5 Adhesive sheet 6 Plastic cylindrical sleeve 61, 62 Butt part 7 Rubber cap 71 Upper end part 72 Main part 8 Extra part GL Ground surface

Claims (10)

In the method of fixing the strut by embedding the base (11) of the steel strut (1) in the ground by subjecting the base to anticorrosion treatment,
The anticorrosion treatment consists of covering with a plastic cylindrical sleeve (6) via an adhesive sheet (5) and covering the upper part of the cylindrical sleeve with a rubber cap (7). However, the upper end is located at a height of 1 to 5 cm above the portion intersecting the ground surface (GL) when the support is embedded, and the lower end is located at a depth of 25 to 45 cm below, The rubber cap prevents the rain water from infiltrating between the support column and the cylindrical sleeve by directly sticking the upper end portion (71) to the support column, and the main body portion (72) attaches the upper part of the cylindrical sleeve to the adhesive sheet. (5) is closely attached and covers the upper part of the cylindrical sleeve to suppress its deterioration,
The burial is placed in a burial hole that has been subjected to anti-corrosion treatment, and the vicinity of the lower end (12) is fixed with asphalt or cement mortar (3), leaving 1-5 cm from the ground surface. After filling with sand (4), the top of the sand is filled with asphalt or cement mortar (3) and fixed.
The fixing method of the support | pillar characterized by the above-mentioned. In the method of fixing the strut by embedding the base (11) of the steel strut (1) in the concrete structure by subjecting the base to anticorrosion treatment,
The anticorrosion treatment consists of covering with a plastic cylindrical sleeve (6) via an adhesive sheet (5) and covering the upper part of the cylindrical sleeve with a rubber cap (7). However, the upper end is located at a height of 1 to 5 cm above the portion that intersects the ground surface (GL) when the support is embedded, and the lower end substantially coincides with the lower end (12) of the support. The rubber cap has an upper end portion (71) that is in direct contact with the support column to prevent rainwater from seeping between the support column and the cylindrical sleeve, and a main body unit (72) that covers the upper portion of the cylindrical sleeve. The adhesive sheet (5) is in close contact with the upper part of the cylindrical sleeve and has a shape that suppresses its deterioration,
Buried,
(B) Put the anti-corrosion-supported strut in the buried hole (2) provided in the concrete structure in advance and fill it with asphalt or cement mortar (3) and fix it (b) The pillars subjected to the anticorrosion treatment are fixed by constructing a concrete structure by placing concrete in a state of being held in a predetermined position.
The fixing method of the support | pillar characterized by the above-mentioned. The method of fixing a post according to claim 1 or 2, further comprising a step of forming an inclined surface by embedding a frustoconical shape (8) with asphalt or cement mortar around a rubber cap after embedding. . When the cross section of the support column (1) is cylindrical, the cylindrical sleeve (6) made of plastic is provided with one cutting line that runs vertically in the cylinder to open the annular cross section, and the cut ends are butted together. The column fixing method according to claim 1 or 2, wherein the column fixing method is carried out using a structure that completes a cylinder and has a shape in which the abutting portions (61, 62) are shaved and overlapped when they are abutted. 3. The support fixing method according to claim 1, wherein the pressure-sensitive adhesive sheet is an unvulcanized butyl rubber double-sided pressure-sensitive adhesive sheet. A plastic cylindrical sleeve (6) is manufactured by injection molding of a polyolefin resin, has a cylindrical or square cylindrical shape and has one cutting line that runs vertically, and the butt portion of the cut end is cut obliquely. The method of fixing a support according to claim 1 or 2, wherein the support has a shape that is peeled and overlapped when butted. The support column according to claim 1 or 2, wherein the plastic cylindrical sleeve (6) is manufactured by extrusion molding of a polyolefin resin, and has a cylindrical or rectangular tube shape and has one cutting line running vertically. Fixing method. A plastic cylindrical sleeve (6) is manufactured by press-molding a polyolefin resin plate, the plate is processed into a cylindrical or rectangular tube, and both ends of the plate are butted and run vertically 3. The method for fixing a support according to claim 1 or 2, wherein the one formed with a cutting line is used. 3. The support fixing method according to claim 1, wherein the rubber cap (7) is made of EPT rubber. It is a plastic cylindrical sleeve used for the anti-corrosion treatment of the column in fixing the cylindrical column, and one side of the double-sided adhesive sheet is affixed to the inside and release paper is applied to the other side A plastic cylindrical sleeve for use in the method for fixing a support according to claim 1 or 2, which is applied.

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