JPH0632028U - Anticorrosion plate for concrete - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a corrosion-preventing plate for concrete which has high adhesion to concrete and which can be safely and easily dry-processed and has excellent corrosion resistance. [Structure] An anticorrosion plate for concrete in which a synthetic resin layer or an FRP layer is provided on one surface of a three-dimensional knit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an anticorrosive material for concrete, in which a synthetic resin layer is provided on one side of a three-dimensional knit, and more specifically, when the cement paste is molded and solidified, the three-dimensional knit side is simply placed on the anticorrosive surface of the concrete. The present invention relates to an anticorrosion plate for concrete, which can form an anticorrosion resin layer on its surface.

[0002]

[Prior art]

 The resin lining method is well known as a method for preventing a concrete pipe from being corroded by an internal fluid. Lining means include manual work performed using a trowel, brush, spray, etc., sheet sticking, thermal spraying method, centrifugal method for pipes, etc. However, there are many problems, and there is no satisfactory method for all of them.

On the other hand, in recent years, it has become clear that FRP is superior in anticorrosion ability to resin alone, and FRP lining has been implemented in various fields. This FRP lining is carried out by hand-laying work in which glass fiber is impregnated with resin at the site and laminated on already dry concrete, but if it is indoor work because a hardening agent or solvent is used. Ventilation must be adequate to ensure safety. Also, for outdoor work, it was necessary to carry out waterproofing. Another problem is that FRP does not have very good adhesion to concrete.

[0004]

[Problems to be solved by the device]

 The present invention focuses on the above circumstances and enhances the adhesion between the concrete and the anticorrosion resin layer, and replaces the conventional wet FRP lining method with a new dry method so that corrosion prevention can be performed easily and safely. The purpose is to develop means.

[0005]

[Means for Solving the Problems]

 As a result of intensive studies conducted by the present inventors to achieve the above-mentioned object, it was found that a synthetic resin layer such as FRP and concrete can be well adhered to each other through a three-dimensional knitted fabric, resulting in the present invention. . That is, it is a summary of the anticorrosion plate for concrete of the present invention that a synthetic resin layer is provided on one surface of a three-dimensional knit, and the synthetic resin layer is a FRP layer.

[0006]

[Action and Example]

 Hereinafter, the concrete anticorrosion plate of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following drawings. FIG. 1 is a schematic sectional view of an example of the anticorrosion plate for concrete according to the present invention. The anticorrosion plate 1 for concrete is provided with a synthetic resin layer 2 on one side of a three-dimensional knitted fabric having a structure in which a front knitted sheet 43a and a back knitted sheet 43b are connected by a connecting yarn 44 in the thickness direction, that is, a back knitted sheet 43b side Formed by. The synthetic resin layer 2 may be completely impregnated in the back knitted sheet 43b as shown in the drawing, or may be impregnated up to about half of the back knitted sheet 43b in the thickness direction, or beyond the back knitted sheet 43b. A part of the connecting yarn 44 may be incorporated and impregnated. If all three-dimensional knitted fabrics are incorporated in the synthetic resin layer, the anchor effect for concrete cannot be exhibited, which is not suitable.

The thickness of the synthetic resin layer is not particularly limited, but 3 mm or more is preferable from the viewpoint of easy handling and easy formation. Any material can be used as long as it is suitable for anticorrosion applications. For example, thermosetting resins such as unsaturated polyester resins, epoxy resins, vinyl ester resins and phenol resins, and thermoplastic resins such as polyethylene resins and polyamide resins. Etc.

The synthetic resin layer of the present invention is preferably FRP containing reinforcing fibers from the viewpoint of anticorrosion performance and strength of the resin layer. As the reinforcing fiber, glass fiber, carbon fiber, aramid fiber, polyethylene fiber, metal fiber, ceramic fiber and the like can be used. These fibers may be surface-treated and may be in the form of mat, chop, short fiber or long fiber, and the form is not particularly limited. It is also possible to add a filler such as whiskers or calcium carbonate to the synthetic resin layer.

The three-dimensional knitted fabric used in the present invention is obtained by laminating a plurality of flat knitted fabrics or woven fabrics, arranging fiber bundles such as rovings in the thickness direction, and organizing the fiber bundles into multidirectional fiber bundles. It is a kind of textile product having a three-dimensional structure obtained by the above. Many inventions and ideas have been disclosed for these standing fiber structures (for example, JP-A-61-31241, JP-A-63-159558, JP-A-1-136190, JP-A-1-250454, and JP-A-1-250454). 1-292156). Some of the above-mentioned three-dimensional knitted fabrics are used as fillers for reinforcing structures, but there is no example of using them as a concrete anticorrosion plate by compounding with a synthetic resin layer as in the present invention. It was

The three-dimensional knitted fabric according to the present invention is used as an anchor effect for bringing the synthetic resin layer into close contact with the surface of concrete requiring corrosion protection. Therefore, as long as the voids in the three-dimensional knitted fabric have voids that can be impregnated with cement mortar or synthetic resin, the three-dimensional structure and manufacturing method are not limited.

FIG. 2 shows a model explanatory view of a three-dimensional knitted fabric having a hexagonal mesh structure as an example of the three-dimensional knitted fabric. The three-dimensional knitted fabric 41 has a large number of hexagonal openings 42 formed in a plane by a loop mesh 45, and a connecting yarn 44 is provided between the front side 43a and the back side 43b of two facing mesh knitted sheets in the thickness direction. It has a linked structure. Of course, the opening may be circular, elliptical, rectangular, or grid-shaped. The front side 43a and the back side 43b may have different knitted fabrics. For example, the back knitted sheet may be a dense knitted fabric having a small opening and the front side may be a coarse knitted fabric having a large opening.

Further, although FIG. 3 shows a three-dimensional knitted fabric having only the back knitted sheet 43b and no front knitted sheet 43a, a three-dimensional knitted fabric of such a form is also formed on the back knitted sheet side with a synthetic resin. By providing layers, the anticorrosion plate for concrete of the present invention can be obtained. This three-dimensional knit can be easily obtained, for example, by cutting the three-dimensional knit 41 shown in FIG. 2 in the middle of the connecting yarn 44.

The thickness of the three-dimensional knit can be adjusted by the connecting yarn 44, and is preferably 5 to 20 mm in the present invention. Examples of the material for the three-dimensional knitted material include polyolefins such as polyethylene and polypropylene, vinylidene chloride, polyester, nylon, aramid, carbon fibers, and other organic fibers, inorganic fibers, and metal fibers having excellent corrosion resistance. Further, the sheet material and the material of the connecting yarn may be different.

In order to impregnate and integrate the three-dimensional knitted fabric and the synthetic resin layer, for example, after putting a predetermined amount of synthetic resin containing a curing agent, reinforcing fibers, etc. in a mold of a predetermined size, There is a method in which a knitted material is placed and cured at room temperature or by heating to harden the synthetic resin layer.

The anticorrosion plate for concrete of the present invention has a void in the three-dimensional knitted fabric by causing the three-dimensional knitted side of the anticorrosion plate to face closely to the anticorrosion required surface of the concrete at the stage where the cement paste is shaped and solidified. Since the concrete is solidified with the concrete entering, it is possible to easily obtain concrete with the synthetic resin layer formed on the surface side. For example, when making a concrete U-shaped block used for drainage, etc., make the three-dimensional knit side of the corrosion-preventing plate of the present invention close to both side walls and the bottom side on the flow path side (inside), and pressurize and solidify if necessary. And, the anticorrosion U-shaped block can be obtained.

FIG. 4 shows an embodiment of using the anticorrosion plate for concrete of the present invention. The three-dimensional knitted fabric is illustrated in the form as shown in FIG. Even if the adhesion strength between the concrete 3 and the synthetic resin layer 2 or the FRP layer is poor, if the concrete anticorrosion plate 1 of the present invention is used, the concrete 3 and the resin layer 2 are always in contact with each other through the three-dimensional knit 41. Therefore, the anticorrosion plate 1 and the concrete 3 are firmly adhered to each other due to the anchor effect of the three-dimensional knit.

It is also possible to prevent corrosion of tubular concrete by forming the anticorrosion plate for concrete of the present invention into a tubular shape and closely contacting it when molding a concrete pipe.

[0018]

[Effect of device]

 Since the anticorrosion plate for concrete of the present invention is configured as described above, it is possible to provide an anticorrosion plate for concrete in which the concrete and the resin layer for anticorrosion can firmly adhere to each other. Further, by using the anticorrosion plate for concrete of the present invention, the anticorrosion of concrete can be performed easily and safely as compared with the conventional resin lining and FRP lining. In addition, since anticorrosion processing can be done at the same time when concrete is poured, there is no need to carry out anticorrosion work again, and the construction period can be greatly shortened.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of an anticorrosion plate for concrete according to the present invention.

FIG. 2 is a model explanatory view of a three-dimensional knit used in the present invention.

FIG. 3 is a model explanatory view of another three-dimensional knit.

FIG. 4 is an explanatory cross-sectional view showing a usage state of the anticorrosion plate for concrete according to the present invention.

[Explanation of symbols]

 1 Corrosion preventive plate for concrete 2 Synthetic resin layer 3 Concrete 41 Three-dimensional knitted fabric 42 Openings 43a, 43b Mesh knitted fabric sheet 44 Connecting yarn 45 Loop mesh

Claims (2)

[Scope of utility model registration request] 1. An anticorrosion plate for concrete, characterized in that a synthetic resin layer is provided on one surface of a three-dimensional knit. 2. The anticorrosion plate for concrete according to claim 1, wherein the synthetic resin layer is an FRP layer.