JPH11182778A - Corrosion protective method around piping piercing corrosion-proof sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To positively perform corrosion protection around piping piercing as corrosionproof sheet without effective sealing material such a high density polyethylene or the like. SOLUTION: Ater driving anchor bolts 6 into concrete around piping 3 at a joint part between a corrosionproof sheet 5 on the surface of concrete in a sewage treatment tank and the piping 3 piercing the corrosion-proof sheet 5, packing 7 is disposed around the piping 3, and a bisected flange member 8 in the form of surrounding the piping 3 is arranged around the piping 3 and pierced with the anchor bolts 6 and fastened by nuts 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anticorrosion method for a concrete body of a structure for treating water having a concrete corrosive component, such as an industrial wastewater treatment tank or a sewage treatment plant, and more particularly, to a pipe surrounding a pipe penetrating an anticorrosion sheet of the concrete body. The present invention relates to an anticorrosion method.

[0002]

2. Description of the Related Art Generally, when a sewage treatment tank such as a factory wastewater treatment tank or a sewage treatment plant is formed of a concrete body, it is protected from acid or alkali components in water and other concrete corrosive components to ensure a service life. To do
It is indispensable to perform anticorrosion treatment on the surface of the concrete skeleton.

Conventionally, methods for preventing corrosion of concrete structures, such as industrial wastewater treatment tanks and sewage treatment plants, which treat concrete containing corrosive components include the following: (1) The surface of a concrete body is made of epoxy resin or the like as an anticorrosion coating. A method of applying a resin material, (2) a method of attaching an anticorrosion sheet molded of a resin material to the surface of a concrete body as an anticorrosion coating material, or (3) attaching a projection to the back of the anticorrosion sheet as an anticorrosion coating material There is a method of forming an anticorrosion layer on the surface of the concrete body by placing concrete.
Thus, an anticorrosion coating layer is formed on the surface of the concrete skeleton.

When there is a pipe penetrating the anticorrosion coating layer, generally, the watertightness around the pipe is ensured by filling a sealing material.

[0005] That is, as shown in FIG. 2, when there is a pipe 3 penetrating from the concrete frame 1 to the anticorrosion coating layer 2 on the surface thereof, a sealing material 4 attached to both the pipe 3 and the anticorrosion coating layer 2 is applied. The anticorrosion method of filling a gap between the pipe 3 and the anticorrosion coating layer 2 is employed. FIG. 2 shows a case in which an anticorrosive coating material capable of bonding is used. A putty material such as an epoxy resin is filled as a sealing material 4 between the pipe 3 and the concrete frame 1, and then the anticorrosion coating material is applied. The anticorrosion coating layer 2 is formed by coating.

As anticorrosion sheets, plastic sheets such as high-density polyethylene sheets have attracted attention because of their high anticorrosion properties.
Conventionally, the watertightness around the piping has been ensured by a bonding method of filling a sealing material around the piping penetrating the anticorrosion sheet.

[0007]

However, plastic sheets, such as high-density polyethylene sheets, often do not have an effective sealing material. Therefore, when, for example, a high-density polyethylene-based anticorrosion sheet is used as the anticorrosion coating material, since the high-density polyethylene-based anticorrosion sheet does not have an effective sealing material, the anticorrosion by filling the sealing material as described above. The method has a problem with water tightness in the long run.

Of course, in the case of a plastic sheet material such as a high-density polyethylene sheet which does not work with a sealing material, the pipes can be changed to pipes of the same material as the anticorrosion coating layer, and can be integrated by heat welding. is there. However, there are cases where the piping cannot be changed. In such a case, if the anticorrosion method by adhesion is adopted, since the sealing material is not effective, corrosive water intrudes from the contact surface between the sealing material and the plastic sheet for a long time, and reliable anticorrosion cannot be performed. For this reason, it has been an obstacle when adopting the anticorrosion coating method using a plastic sheet such as a high-density polyethylene sheet having high anticorrosion properties. In particular, in the renovation work, since the pipes were installed first, there was a possibility that the anticorrosion treatment around the pipes became uncertain.

Therefore, an object of the present invention is to solve the above-mentioned problems, and to provide a method of preventing corrosion around a pipe penetrating an anticorrosion sheet. An object of the present invention is to enable reliable anticorrosion.

[0010]

In order to achieve the above object, the present invention provides a method for preventing corrosion around a pipe penetrating an anticorrosion sheet, comprising: an anticorrosion sheet for a concrete surface of a structure for treating water having a concrete corrosive component; At the joint with the pipe that penetrates, after anchor bolts are poured into the concrete around the pipe, packing is arranged around the pipe, and a flange member surrounding the pipe is arranged around the pipe, and the anchor is placed around the pipe. It is inserted into a bolt and tightened with a screw.

According to the present invention, as the anticorrosion sheet, for example, a plastic sheet, especially a high-density polyethylene sheet,
The target is a polypropylene sheet, a vinyl chloride sheet or the like, but is not limited to these sheets.

According to the present invention, by tightening the screw, the packing provided around the pipe is pressed toward the anticorrosion sheet by the flange member, and the packing and the anticorrosion sheet and between the packing and the pipe circumference are tightened. Are sealed watertight. Therefore, even when a high-density polyethylene-based anticorrosion sheet without an effective sealing material is used, watertightness and anticorrosion are maintained for a long period of time, and as a result, a high anticorrosion sheet is used. And a long-life anti-corrosion coating method in which water is prevented and the anti-corrosion of the piping section is ensured. Therefore, it is extremely effective as a method for preventing corrosion of the pipe portion when the pipe cannot be changed to the same material.

Further, by sealing the gap between the pipe and the flange member with a resin material, erosion from the pipe mounting portion can be prevented.

As a sealing material (a caulking material), a silicone caulking material is most commonly used.
Various known sealing materials such as an epoxy resin, a polyurethane, a polysulfide, a butyl rubber, and an acrylic oil-based caulk can be used.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a case where the present invention is applied to a factory waste liquid treatment tank, which is a kind of sewage treatment tank, will be described as an example.

In FIG. 1, an anticorrosion sheet 5 made of high-density polyethylene is provided on the concrete surface of a concrete frame 1 constituting a wastewater treatment tank for a factory, and a metal pipe 3 penetrates the anticorrosion sheet 5. It is provided.

The concrete skeleton 1 of this factory waste liquid treatment tank
Is performed around the pipe 3 penetrating the anticorrosion sheet 5. Originally, the rough surface condition of the concrete surface is not compatible with the bonding work of the anticorrosion sheet 5. The alkaline nature of the building is also detrimental to adhesion. In addition, the corrosion-resistant sheet pressed by the groundwater pressure of the surrounding ground that has permeated the concrete structure, or the pressure at which the moisture in the concrete has evaporated has swelled and eventually peels off, and harmful water may penetrate and go around. .

Therefore, first, at the joint between the anticorrosion sheet 5 and the pipe 3 penetrating therethrough, a plurality of anchor bolts 6 are cast into concrete around the pipe 3, and a part of each bolt is removed. It protrudes from the surface of the concrete skeleton 1.

Thereafter, a packing 7 made of, for example, butyl rubber having elasticity and corrosion resistance is provided around the pipe 3. For this, a circular opening is provided in the center of the packing 7 in advance,
The opening of the packing 7 is provided by being inserted through the pipe 3 in the axial direction.

Next, a flange member 8 made of stainless steel is arranged around the pipe 3, and the anchor bolt 6 is inserted through a small hole provided in the flange member 8 in advance. In this case, the flange member 8 made of stainless steel may be divided into two and arranged so as to surround the pipe 3 from the periphery. In addition, the flange member 8
In addition to those made of stainless steel, those made of rigid plastic, anticorrosion-treated inorganic materials, metal materials, and the like can be used.

Then, a nut 9 is screwed as a screw to the head of the anchor bolt 6 protruding from the flange member 8 and tightened.

Thereafter, the gap between the pipe 3 and the flange member 8 and the portion of the nut 9 are sealed with a resin material such as epoxy resin.

According to the anticorrosion method of the above embodiment, by tightening the nut 9, the packing 7 disposed around the pipe is pressed toward the anticorrosion sheet 5 by the flange member 8, and the packing 7 and the anticorrosion sheet 5 are pressed. The space between the packing 7 and the periphery of the pipe 3 is sealed watertight. Therefore, the anticorrosion sheet of the high-density polyethylene system having high anticorrosion properties is used to prevent the surface of the concrete skeleton of the factory wastewater treatment tank from being corroded, and also to perform water stop and anticorrosion around the piping part without fail. A long life anticorrosion coating method can be obtained. Therefore, it is extremely effective as a method for preventing corrosion of the pipe portion when the pipe cannot be changed to the same material. Further, since the gap between the pipe 3 and the flange member 8 and the portion of the nut 9 are sealed with a resin material, it is possible to prevent erosion from the pipe mounting portion and the portion of the nut 9.

Conventionally, when a pipe and an anti-corrosion sheet are integrated by welding, the pipe and the anti-corrosion sheet must be made of the same material, and when a sealing material is used to ensure watertightness around the pipe, It was necessary to change the piping material and anticorrosion sheet to a material that works well, but by adopting this anticorrosion coating method, it is possible to reliably prevent corrosion of the pipe part regardless of the type of piping material and anticorrosion sheet. .

In the above embodiment, the packing 7 is tightened by the flange member 8, but the joint between the anticorrosion sheet 5 on the concrete surface and the pipe 3 penetrating the same is coated with a highly anticorrosive filler. Then, it is configured to be fastened by a flange member 8 made of a material having high corrosion resistance via the anchor bolt 6, or to apply a filler having high water-proof and reliable anti-corrosion property between the pipe and the anti-corrosion sheet, It is also possible to adopt a configuration in which a flange member 8 made of a material having high corrosion resistance is tightened via the packing 6 and the packing 7. The former form is a case in which the anticorrosion sheet 5 as the anticorrosion coating layer is made of a material such as a high-density polyethylene sheet that does not work with a sealing material. After the anchor bolts 6 are cast around the periphery of the pipe 3, a reliable water-stopping filler is filled between the pipe 3 and the anticorrosion sheet 5 as the anticorrosion coating layer, and the stainless steel flange member 8 is attached to the anchor bolts 6.
, And tightened with a screw 9 to ensure the water stop and corrosion prevention of the piping.

In the above embodiment, the flange member is made of stainless steel because of its high corrosion resistance. However, another material having high corrosion resistance, for example, a metal flange member or a plastic flange member may be used. However, a metal flange member is more advantageous than a plastic flange member because it has higher rigidity.

Further, in the above embodiment, the gap between the pipe 3 and the flange member 8 and the portion of the nut 9 are sealed, but the sealing is performed only in the gap between the pipe 3 and the flange member 8. Is also good.

[0028]

As described above, according to the present invention, at the joint between the anticorrosion sheet on the concrete surface of the structure for treating water having a concrete corrosive component and the pipe penetrating therethrough, the concrete surrounding the pipe is removed. After placing the anchor bolt, packing is arranged around the pipe, and a split flange member surrounding the pipe is arranged around the pipe and inserted through the anchor bolt and tightened with a nut as a screw. The packing is pressed toward the anticorrosion sheet by the flange member, and the space between the packing and the anticorrosion sheet and around the pipe is sealed watertight. Therefore, even when a high-density polyethylene-based anticorrosion sheet without an effective sealing material is used, water tightness and anticorrosion are maintained for a long time.
For this reason, a long-life anticorrosive coating using a highly anticorrosive sheet and ensuring the water stoppage and anticorrosion of the pipe portion can be obtained. Therefore, even if it is not possible to change the pipe to the same material, there is no need to change the pipe material and anticorrosion sheet to a material that works well, as in the case of securing the water tightness around the pipe with the conventional sealing material. Regardless of the material and the type of the anticorrosion sheet, reliable anticorrosion of the pipe portion can be achieved.

Further, by sealing the gap between the pipe and the flange member with a resin material, erosion from the pipe mounting portion can be prevented.

[Brief description of the drawings]

FIG. 1 is a view showing a method of preventing corrosion around a pipe penetrating an anticorrosion sheet of the present invention.

FIG. 2 is a view showing a conventional method of preventing corrosion around a pipe by a sealing material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete frame 2 Anticorrosion coating layer 3 Piping 4 Sealing material 5 Anticorrosion sheet 6 Anchor bolt 7 Packing 8 Flange member 9 Nut (screw)

Claims (2)

[Claims] Claims: 1. An anchor bolt is poured into concrete around a pipe at a joint between the anticorrosion sheet on the concrete surface of the structure for treating water having a concrete corrosive component and the pipe passing therethrough, and then around the pipe. A method for preventing corrosion around a pipe penetrating an anticorrosion sheet, comprising arranging a packing, arranging a flange member surrounding the pipe around the pipe, inserting the flange member through the anchor bolt, and tightening with a screw. 2. The method according to claim 1, further comprising sealing a gap between the pipe and the flange member with a resin material.