JP4002652B2 - Anti-corrosion method around the pipe that penetrates the anti-corrosion sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anticorrosion method for a concrete casing of a structure that treats water having a concrete corrosive component such as a factory waste liquid treatment tank or a sewage treatment plant, and more particularly to an anticorrosion method around a pipe that penetrates an anticorrosion sheet of the concrete casing. .
[0002]
[Prior art]
In general, when a sewage treatment tank such as a factory waste liquid treatment tank or a sewage treatment plant is formed of a concrete frame, in order to protect this from acid or alkali components in water or other concrete corrosive components, It is indispensable to apply anticorrosion treatment to the surface of the enclosure.
[0003]
Conventionally, corrosion prevention methods for concrete structures that treat water with concrete corrosive components, such as factory wastewater treatment tanks and sewage treatment plants, include: (1) A resin material such as epoxy resin is used as the anticorrosion coating on the surface of the concrete frame. Application method, (2) Method of sticking anticorrosion sheet molded with resin material on the surface of concrete frame as anticorrosion coating material, or (3) Protrusion attached on the back side of anticorrosion sheet as anticorrosion coating material There is a method of forming an anticorrosion layer on the surface of the concrete frame by casting, and the anticorrosion coating layer is formed on the surface of the concrete frame by these methods.
[0004]
When there is a pipe penetrating the anticorrosion coating layer, generally, the watertightness around the pipe is ensured by filling with an adhesive. That is, as shown in FIG. 3, when there is a pipe 3 penetrating from the concrete housing 1 through the anticorrosion coating layer 2 on the surface, an adhesive 4 that adheres to both the pipe 3 and the anticorrosion coating layer 2 is applied, and the pipe 3 The anticorrosion method of filling a gap between the anticorrosion coating layer 2 and the anticorrosion coating layer 2 is employed. FIG. 3 shows a case where an anticorrosive coating material that can be bonded is handled. A putty material such as an epoxy resin is filled as an adhesive 4 between the pipe 3 and the concrete housing 1, and then the anticorrosive coating material is applied. The anticorrosion coating layer 2 is formed by coating.
[0005]
A plastic sheet such as a high-density polyethylene sheet is attracting attention as an anticorrosion sheet because it has high anticorrosion properties. However, conventionally, when such an anticorrosion sheet is handled, an adhesive is filled around the pipe passing through the anticorrosion sheet. With this bonding method, the water tightness around the piping is secured.
[0006]
[Problems to be solved by the invention]
However, plastic sheets such as high density polyethylene sheets often lack an effective adhesive. Therefore, for example, when a high-density polyethylene-based anticorrosion sheet is used as the anticorrosion coating material, since there is no effective adhesive in the high-density polyethylene-based anticorrosion sheet, the anticorrosion by filling the adhesive as described above. The method has a problem with water tightness in the long run.
[0007]
Of course, in the case of a plastic sheet material that does not work with an adhesive, such as a high-density polyethylene sheet, integration is possible by changing the pipe to a pipe made of the same material as the anticorrosion coating layer and heat welding. However, there are cases where the piping cannot be changed. In such a case, when the anticorrosion method by bonding is adopted, the adhesive is not effective, and therefore corrosive water has infiltrated from the contact surface between the adhesive and the plastic sheet for a long period of time, and reliable anticorrosion cannot be achieved. For this reason, it has become 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 are installed first, the anticorrosion treatment around the pipes may be uncertain.
[0008]
Therefore, the object of the present invention is to solve the above-mentioned problems, and in the anticorrosion method around the pipe that penetrates the anticorrosion sheet, reliable anticorrosion around the pipe that penetrates the anticorrosion sheet without an effective adhesive such as high-density polyethylene. Is to be able to do.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the anticorrosion method around the pipe that penetrates the anticorrosion sheet according to the present invention includes an anticorrosion sheet around the pipe at the joint between the anticorrosion sheet on the concrete surface of the sewage treatment tank and the pipe that penetrates the anticorrosion sheet. A sheet of the same material is wound, the periphery of the wound sheet is fastened with a belt having high corrosion resistance, and the wound sheet and the anticorrosion sheet are welded together by heat welding.
[0010]
In the present invention, it is preferable to wind a sheet of the same material as the anticorrosion sheet at least once so as to have an overlapping portion.
[0011]
Furthermore, it is preferable to apply a filler to the overlapping portion and the contact portion between the sheet and the pipe in the axial front end surface of the wound sheet pipe.
[0012]
Furthermore, the end of the winding end in the circumferential direction of the wound sheet can be welded to the sheet to form a cylinder.
[0013]
Here, according to the present invention, for example, a plastic sheet, particularly a high-density polyethylene sheet, a polypropylene sheet, a vinyl chloride sheet, or the like is targeted as the anticorrosion sheet, but is not limited to these sheets.
[0014]
And according to the present invention, by tightening the sheet wound around the pipe with a belt, water tightness between the wound sheet and the pipe periphery is secured, and water tightness between the laminated sheets of the wound sheet is secured. Is secured. And since this wound sheet | seat and the anticorrosion sheet | seat are heat-welded and welded, high water-tightness is ensured also between both, and it is prevented that corrosive water contacts a piping penetration part.
[0015]
Therefore, according to the anticorrosion method of the present invention, even when a high-density polyethylene-based anticorrosion sheet without an effective adhesive is used, watertightness and anticorrosiveness are maintained over a long period of time. In particular, a long-life anti-corrosion coating method using a sheet having high anti-corrosion properties and ensuring water-stopping and anti-corrosion of the piping portion can be obtained. Therefore, it is extremely effective as an anticorrosion method for the pipe portion when the pipe cannot be changed to the same material.
[0016]
In addition, when aiming at the completeness of water stop and corrosion prevention, it is good to fill with fillers, such as a silicone sealing agent and a butyl rubber filler, between the wound sheet | seat and piping, and the overlap part of the wound sheet | seat.
[0017]
Here, as a sealing material (caulking material) as a filler, a silicone caulking material is most commonly used, but various known sealing materials such as epoxy resin, polyurethane-based, polysulfide-based, butyl rubber-based, and acrylic oil-based caulking are used. Material can be used.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the case where the present invention is applied to a factory waste liquid treatment tank will be described as an example.
[0019]
In FIG. 1, a high-density polyethylene anticorrosion sheet 5 is disposed on the concrete surface of the concrete casing 1 constituting the factory waste liquid treatment tank, and a metal pipe 3 is provided through the anticorrosion sheet 5. It has been.
[0020]
The anticorrosion treatment of the concrete casing 1 of this factory waste liquid treatment tank is performed around the pipe 3 penetrating the anticorrosion sheet 5. That is, first, a highly anticorrosive filler such as a silicone sealing agent or a butyl rubber filler is applied around the pipe 3.
[0021]
Next, the high-density polyethylene sheet 6 made of the same material as the anticorrosion sheet 5 is wound around the pipe 3 one or more times, here, one and a half times or more. Here, the overlapping portion of the sheet 6 made of high-density polyethylene also has a high anticorrosion property such as a silicone sealing agent or a butyl rubber filler so as to fill the gap between the overlapping portions on the axial front end surface of the pipe 3. In addition to applying the filler, the filler is similarly applied to the gap between the front end surface of the wound sheet 6 and the outer peripheral surface of the pipe 3. .
[0022]
Next, the periphery of the sheet 6 is fastened from above the wound sheet 6 with a belt 7 made of a material having high corrosion resistance, here stainless steel. The tightening with the belt 7 is preferably performed in multiple stages in order to ensure high water-tightness. In this embodiment, the belt 7 is tightened with the belt 7 at two positions in the axial direction of the pipe 3, that is, in two stages. Tightening is performed here with screws 8 that connect the circumferential ends of the belt 7 as shown in FIG.
[0023]
And the axial direction one end side of the wound sheet | seat 6, ie, the side which contact | connects the anti-corrosion sheet 5, is welded to the anti-corrosion sheet 5 by heat welding. In FIG. 1, 9 shows a heat welded portion in which the rolled sheet 6 and the anticorrosion sheet 5 are welded by heat welding. This thermal welding is performed over the entire circumference of one end in the axial direction of the wound sheet 6 to ensure water tightness between the wound sheet 6 and the anticorrosion sheet 5. Further, the winding end end portion in the circumferential direction of the wound sheet 6 is welded onto the lower sheet 6 by heat welding, whereby the shape of the wound sheet 6 is continuously joined with its peripheral surface being watertightly joined. It forms in the cylinder shape which consists of a surface, and prevents corrosive water from contacting the piping penetration part from the clearance gap between the edge parts of the wound sheet | seat 6. FIG.
[0024]
In the above-described embodiment, after applying a highly anticorrosive filler around the pipe 3, the sheet 6 made of the same material as the anticorrosion sheet 5 is wound around the pipe 3. The sheet 6 can also be wound without applying a filler depending on circumstances, such as when a sufficient water tightness is ensured. Similarly, the filler applied to the overlapping portion of the high-density polyethylene sheet 6 can be omitted depending on circumstances.
[0025]
According to the anticorrosion method of the above embodiment, by tightening the sheet 6 wound around the pipe with the belt 7, the watertightness between the wound sheet 6 and the periphery of the pipe 3 and the watertightness between the laminated sheets of the wound sheets. As well as ensuring high water tightness between the wound sheet 6 and the anticorrosion sheet 5 by heat welding, effectively prevent corrosive water from coming into contact with the pipe penetration part. Can do.
[0026]
Accordingly, even when a high-density polyethylene-based anticorrosion sheet without an effective adhesive is used, the watertightness and anticorrosion properties are maintained for a long period of time, and as a result, a sheet having a high anticorrosion property is obtained. A long-life anti-corrosion coating method that can be used and ensures water-stopping and anti-corrosion of the piping section is obtained. Therefore, it is extremely effective as an anticorrosion method for the pipe portion when the pipe cannot be changed to the same material.
[0027]
Conventionally, when the pipe and the anticorrosion sheet are integrated by welding, it is necessary to make the pipe and the anticorrosion sheet the same material, and when securing the water tightness around the pipe with an adhesive, Although it was necessary to change the anticorrosion sheet to a material having adhesion, by adopting the anticorrosion coating method, the pipe portion can be reliably prevented from being corroded regardless of the type of the pipe material and the anticorrosion sheet.
[0028]
In the above embodiment, the belt 7 is made of stainless steel because it has high corrosion resistance. However, other belts made of high corrosion resistance such as metal or plastic can also be used.
[0029]
【The invention's effect】
As described above, according to the present invention, the joint of the anticorrosion sheet on the concrete surface of the structure for treating water having a concrete corrosive component and the pipe penetrating the same is formed around the pipe with the same material as the anticorrosion sheet. After winding the sheet and tightening the periphery of the wound sheet with a highly corrosion-resistant belt, the wound sheet and the anticorrosion sheet were welded by heat welding, so the sheet wound around the pipe was wound by tightening with the belt Since the water tightness between the sheet and the periphery of the pipe and the water tightness between the laminated sheets of the rolled sheet are ensured, and the high water tightness between the two is ensured by thermal welding between the wound sheet and the anticorrosive sheet, It can prevent effectively that corrosive water contacts a piping penetration part.
[0030]
Therefore, even when, for example, a high-density polyethylene anticorrosion sheet without an effective adhesive is used, watertightness and anticorrosion are maintained for a long period of time. For this reason, a long-life anticorrosion coating using a sheet having high anticorrosion properties and ensuring waterstop and anticorrosion of the piping portion can be obtained. Therefore, even if the piping cannot be changed to the same material, there is no need to change the piping material and anti-corrosion sheet to a material that works well, as in the case of securing the water tightness around the piping with a conventional adhesive. Regardless of the type of material and anticorrosion sheet, the pipe portion can be reliably prevented from being corroded.
[Brief description of the drawings]
FIG. 1 is a view showing a corrosion prevention method around a pipe passing through an anticorrosion sheet of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1 showing the periphery of the pipe in the anticorrosion method of the present invention.
FIG. 3 is a diagram showing a conventional anticorrosion method around a pipe using an adhesive.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Concrete frame 2 Corrosion-proof coating layer 3 Piping 4 Adhesive 5 Corrosion-proof sheet 6 Sheet 7 Belt 8 Screw 9 Thermal welding part

Claims (4)

At the joint between the anticorrosion sheet on the concrete surface of the structure that treats water containing concrete corrosive components and the pipes that pass through it, a sheet of the same material as the anticorrosion sheet is wrapped around the pipe, and the periphery of the wound sheet is corrosion resistant An anticorrosion method around a pipe passing through an anticorrosion sheet, wherein the wound sheet and the anticorrosion sheet are welded together by heat welding after tightening with a high belt. The sheet of the same material as that of the anticorrosion sheet is wound one or more times so as to have an overlapping portion, and the anticorrosion method around a pipe penetrating the anticorrosion sheet according to claim 1. The anticorrosion around the pipe penetrating the anticorrosion sheet according to claim 2, wherein a filler is applied to the overlapping portion and a contact portion between the sheet and the pipe at an axial front end surface of the wound sheet pipe. Method. The end of the winding in the circumferential direction of the wound sheet is welded to the sheet and formed into a cylindrical shape. The pipe around the anticorrosion sheet according to any one of claims 1 to 3, Anticorrosion method.

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