JP2022015344A - Anticorrosion reinforcing member for steel pipe - Google Patents

Abstract

To provide an anticorrosion reinforcing member for a steel pipe that is integrally organized a petrolatum-based anticorrosion material attached to an inner surface of the steel pipe and a reinforcing material that complements a strength of the steel pipe reduced by corrosion.SOLUTION: An anticorrosion reinforcing member 100 for a steel pipe according to the present invention is inserted into a hollow part of a steel pipe 6, and a curable resin can be filled into an airtight layer 3 from an inlet 5 and impregnated into a reinforcing layer 4. When air is filled from the inlet, an anticorrosion layer 1 is formed on an inner surface of the steel pipe due to an expansion pressure. Further, after the reinforcing layer is expanded and the curable resin is cured, the reinforcing layer is formed in the steel pipe.SELECTED DRAWING: Figure 2

Description

The invention disclosed herein relates to an anticorrosion reinforcing member for a steel pipe used inside the steel pipe.

The steel pipes of steel structures installed outdoors are rust-proofed by galvanizing.

With zinc plating that has exceeded its useful life, metal corrosion due to water intrusion from scratches and cracks is inevitable. As disclosed in Patent Document 1, there are a coated anticorrosion structure and a coated anticorrosion method for a steel structure in which the outer surface of a steel pipe is protected from corrosion by a petrolatum-based food-proof material, which is a multi-layer coating. Further, Patent Document 2 includes a method of lining an inner wall of a pipe with a coating of a lining cloth pipe, which is a multi-layer coating.

These multi-layer coatings are intended for corrosion protection of the outer surface of the steel pipe of the steel structure and lining in the pipe, and do not compensate for the decrease in strength due to corrosion. If it is a steel pipe anticorrosion reinforcing member that has both anticorrosion and reinforcement of the steel pipe, it is considered that construction and maintenance will be simplified because it is integrally knitted.

JP-A-2019-178358 JP-A-2004-291605

In view of the above background, the present invention is an anticorrosion reinforcing member for a steel pipe, and a reinforcing material capable of attaching a petrotalum-based food-preventing ingredient to the inner surface of the steel pipe and complementing the strength of the steel pipe reduced by corrosion is integrally knitted. The purpose is to make construction and maintenance easy.

To solve this problem, the present invention is a member in which a member is attached to a hollow portion of a steel pipe to prevent corrosion of the inner surface of the steel pipe, and a reinforcing material that complements the strength of the steel pipe reduced by corrosion is integrally knitted. .. The member is formed by laminating four layers from the surface layer to an anticorrosion layer, a pressure resistant layer, an airtight layer, and a reinforcing layer.

The anticorrosion layer of the anticorrosion reinforcing member of the steel pipe according to the present invention is formed by impregnating a non-woven fabric with a petrotalum-based anticorrosive food material. The pressure resistant layer is made of a low elongation fiber woven fabric or a plastic sheet or a non-woven fabric. The airtight layer is made of a gas barrier plastic film. The reinforcing layer is made of a high-strength, low-elongation fibrous fabric or non-woven fabric.

When the anticorrosion reinforcing member of the steel pipe according to the present invention is inserted into the hollow portion of the steel pipe and then filled with air from the injection port, the expansion pressure presses the anticorrosion layer against the inner surface of the steel pipe through the airtight layer. An anticorrosion layer is formed. At the same time, the reinforcing layer develops, and when the impregnated curable resin is cured, the reinforcing layer is formed.

The anticorrosion reinforcing member for a steel pipe according to the present invention has an injection port arranged in an airtight layer. Curable resin can be injected into the reinforcing layer from the injection port. It is also possible to fill the airtight layer with air.

The anticorrosion reinforcing member for a steel pipe according to the present invention is provided with an airtight layer for preventing evaporation and leakage of petrotalum in the anticorrosion layer. Further, the airtight layer functions as an air expander at the time of attachment.

The anticorrosion reinforcing member for a steel pipe according to the present invention is provided with a pressure resistant layer that suppresses deformation of the anticorrosion layer due to the expansion pressure of air. In addition, the pressure-resistant layer suppresses deformation and peeling of the anticorrosion layer due to linear expansion of the steel pipe after attachment.

The anticorrosion reinforcing member for steel pipes according to the present invention can be provided with petrotalum-based foodstuffs on the inner surface of the steel pipes, and by integrally knitting a reinforcing material that complements the strength of the steel pipes reduced by corrosion, construction and maintenance become easier. ..

A plan view (A) of the anticorrosion reinforcing member 100 of the steel pipe and a cross-sectional view (B) of the side surface thereof. The figure (C) in the process of attaching the anticorrosion reinforcing member 100 of the steel pipe fixed to the inner surface of the steel pipe, and the figure (D) attached. A view (E) in which the anticorrosion reinforcing member 100 of the steel pipe is attached to the steel pipe, a view (F) in which the anticorrosion reinforcing member 100 is attached to the steel pipe having an inner wall, and an enlarged view (G) thereof.

The embodiment of the anticorrosion reinforcing member 100 of the steel pipe which concerns on this invention is shown in FIGS. 1A and 1B. The anticorrosion reinforcing member of the steel pipe of the present embodiment is formed by laminating four layers of the anticorrosion layer 1, the pressure resistant layer 2, the airtight layer 3, and the reinforcing layer 4 from the surface layer of the member.

The anticorrosion layer is formed by impregnating a non-woven fabric (for example, polyethylene fiber) with a petrotalum-based anticorrosive material. The pressure-resistant layer is made of a fiber woven fabric (for example, polyethylene fiber) or a plastic sheet or a non-woven fabric having the same or lower fiber elongation than the reinforcing layer. The airtight layer is formed of a gas barrier plastic film (for example, PET having a water vapor transmission rate of 5 g / m2 / day or less). The airtight layer has a bag-like shape formed from a film-like tubular shape, and the left-right edges in FIG. 1B are bonded to each other by welding, adhesion, or both. The reinforcing layer is made of a fiber woven fabric having a high Young's modulus (for example, ultra-high molecular weight polyethylene fiber) or a non-woven fabric. These four layers are organized by bonding, laminating, or laminating by vapor deposition. The method of stacking is not limited to these, and there are various methods, so it will not be described in detail here.

As can be seen from FIGS. 1A and 1B, since the airtight layer is filled with air and a curable resin and used, the injection port 5 for that purpose is the right edge portion in FIG. 1B. It is provided in. The inlet is engaged with an adhesive, welding, or both, with a sheet or plastic or metal pipe sandwiched between the airtight layers.

FIG. 2C is a view during attachment in which the anticorrosion reinforcing member 100 of the steel pipe is fixed to the inner surface of the steel pipe 6. The anticorrosion reinforcing member of the steel pipe can be inserted into the hollow portion of the steel pipe, and a predetermined amount of curable resin can be injected into the airtight layer from the injection port to impregnate the reinforcing layer. Alternatively, the anticorrosion reinforcing member of the steel pipe may be filled and impregnated before being inserted into the steel pipe. When air is filled from the injection port, the expansion pressure presses the anticorrosion layer against the inner surface of the steel pipe through the airtight layer to form the anticorrosion layer. At the same time, the reinforcing layer expands, and when the impregnated curable resin is cured, the reinforcing layer is formed. Since the reinforcing layer permanently presses the anticorrosion layer, it is difficult to peel off and the durability is improved. Further, since the reinforcing layer forms a structure of fiber reinforced plastic, it also has an effect of complementing the strength of the steel pipe.

As the curable resin of the reinforcing layer, a room temperature curable resin (for example, epoxy resin or acrylic resin) or an ultraviolet curable resin (for example, epoxy resin or acrylic resin) can be used. Further, when the room temperature curing resin is used, the injection port can be sealed until the curing is completed, or air can be constantly supplied to maintain the expansion pressure. When the ultraviolet curable resin is used, the ultraviolet irradiation lamp is inserted in advance from the injection port before filling with air, and the ultraviolet irradiation is started while constantly supplying air to maintain the expansion pressure. can do.

FIG. 2D is a diagram in which the anticorrosion reinforcing member of the steel pipe is attached to the inner surface of the steel pipe. When the curing of the reinforcing layer is completed, the pressure-resistant layer is cut at a position having a glue margin from the edges of the anticorrosion layer and the reinforcing layer, and the glue margin is further increased from the edge of the pressure-resistant layer. The airtight layer can be cut at a position having a length. The pressure-resistant layer and the airtight layer can be adhered to the steel pipe. The adhesive can be applied to the pressure resistant layer and the airtight layer. Alternatively, it can be applied to the steel pipe, or can be applied to both of them.

FIG. 3E is a diagram in which an anticorrosion reinforcing member for the steel pipe is attached to the steel pipe. As shown in FIG. 3F, when the steel pipe is attached to an obstacle such as an inner wall, the anticorrosion reinforcing member of the steel pipe can be inserted and attached to each hollow portion of the steel pipe. FIG. 3G is an enlarged view of a circular alternate long and short dash line at the upper center of the steel pipe in FIG. 3F. As described above, the anticorrosion reinforcing member of the steel pipe can be attached even if the attachment surface is at an acute angle.

100 Anti-corrosion reinforcing member of steel pipe 1 Anti-corrosion layer 2 Pressure-resistant layer 3 Airtight layer 4 Reinforcing layer 5 Injection port 6 Steel pipe

Claims (5)

It is a coated anticorrosion structure attached to the inner surface of a steel pipe, in which an anticorrosive material and a reinforcing material are integrally knitted. Has been done. Anti-corrosion reinforcement member for steel pipes. The anticorrosion layer is formed by impregnating a non-woven fabric with a petrotalum-based anticorrosive material. The anticorrosion reinforcing member for a steel pipe according to claim 1. The pressure-resistant layer is made of a low-elongation fiber woven fabric, a plastic sheet, or a non-woven fabric. The anticorrosion reinforcing member for a steel pipe according to claim 1. The airtight layer is made of a gas barrier plastic film and is provided with an injection port. The anticorrosion reinforcing member for a steel pipe according to claim 1. The reinforcing layer is made of a fiber woven fabric or a non-woven fabric having a high Young's modulus. The anticorrosion reinforcing member for a steel pipe according to claim 1.

Images