JP3972214B2 - Concrete anticorrosion sheet lining method - Google Patents

Description

  The present invention relates to a novel concrete anticorrosion treatment method, and more particularly to a concrete anticorrosion sheet lining method that is simple and reliable in construction and capable of high-quality anticorrosion.

  As a technique for suppressing corrosion of a concrete structure, a method of coating the surface of concrete by a sheet lining method is known. The sea lining method is a method of covering concrete by adhering a concrete frame and a corrosion-resistant sheet. 1), (2) Embedded formwork method using vinyl ester resin-based resin concrete board or vinyl ester resin FRP board (see FIG. 2), or (3) vinyl ester resin FRP multilayer board, unsaturated polyester A post-paste method (see FIG. 3) using a resin FRP plate, a high-density polyethylene resin molded plate, or the like is known (Non-Patent Document 1).

The anticorrosion coating layer of concrete in these various sheet lining methods has, for example, quality standards such as coating appearance, adhesion to concrete, acid resistance, sulfur penetration depth, alkali resistance, and water permeability according to the corrosive environment. Satisfaction is required.
Edited by Japan Sewerage Corporation, “Guidelines and Manual for Corrosion Inhibition Technology and Anticorrosion Technology for Sewerage Concrete Structures” December 2002

  However, in these methods, since the corrosion-resistant sheet is opaque, it is difficult to visually observe the inside of the corrosion-resistant sheet at the time of construction, and it is not possible to sufficiently avoid construction defects such as air accumulation. . In particular, unfilled parts in horizontal parts such as floors and ceilings often occur.

  In these methods, protrusions, three-dimensional fibers, hook-and-loop fasteners, etc. are provided on the concrete side of the board to ensure fixation after hardening with the grout material, but the board requires special processing and is expensive. It was not suitable for mass production.

  Furthermore, it takes time and labor to check the defective part by a hammering test after curing, and it is difficult to check the deformation (cracking, etc.) of the concrete after construction, so maintenance is not easy.

  Accordingly, an object of the present invention is to provide a concrete anticorrosion sheet lining method that is simple and reliable in construction and maintenance, and that is capable of high-quality anticorrosion at low cost. Moreover, it is providing the anti-corrosion concrete structure manufactured by this construction method.

  The present inventor has conducted intensive research to solve the problems of these conventional sheet lining methods, and as a result, transparent FRP (fiber reinforced plastics) is provided on the concrete surface of the concrete structure via ribs (spacers). By attaching a board to provide a space between the concrete surface and the transparent FRP board, injecting and filling a transparent resin into the space, and integrating the concrete surface and the transparent FRP board, It has also been found that high-quality concrete anticorrosive coating can be reliably processed. Based on this knowledge, further studies have been made and the present invention has been completed.

  That is, the present invention relates to the following concrete anticorrosion sheet lining method.

  Item 1. A transparent FRP board is installed on the concrete surface of the concrete structure via ribs, a space is provided between the concrete surface and the transparent FRP board, and a transparent resin is injected into the space and cured. A concrete anticorrosion sheet lining method, wherein the concrete surface and the transparent FRP board are integrated.

  Item 2. Item 2. The concrete anticorrosion sheet lining method according to Item 1, wherein the concrete surface is subjected to surface treatment and primer application.

  Item 3. Item 3. The concrete anticorrosion sheet lining method according to Item 1 or 2, wherein the light FRP board is an FRP board containing a vinyl ester resin.

  Item 4. Apply a putty-like vinyl ester resin adhesive to the rib on the back of the transparent FRP board, press and paste the transparent FRP board against the concrete surface, and end the section partitioned by the ribs to maintain hermeticity Item 4. The concrete anticorrosion sheet lining method according to item 1, 2 or 3, wherein the space is provided by treating the portion with a putty-like adhesive.

  Item 5. Item 5. The concrete anticorrosion sheet lining method according to any one of Items 1 to 4, wherein the transparent resin is an epoxy resin.

  Item 6. Item 6. The concrete anticorrosion sheet lining method according to any one of Items 1 to 5, wherein a transparent resin is injected into the space while applying a negative pressure with a vacuum pump to release air.

  Item 7. Item 7. The concrete anticorrosion sheet lining method according to any one of Items 1 to 6, wherein the transparent resin is injected into the space while visually confirming that the transparent resin is filled.

  Item 8. The anticorrosion concrete structure manufactured by the sheet lining method of the concrete in any one of the said items 1-7.

  Item 9. A corrosion-resistant concrete structure, in which a transparent FRP board is installed on the concrete surface of the concrete structure via a rib, and the space provided between the concrete surface and the transparent FRP board is transparent. An anti-corrosion concrete structure filled with resin.

  The present invention is described in detail below.

  In the concrete anticorrosion sheet lining method of the present invention, the concrete surface of the concrete structure is first surface-treated. This surface treatment is performed in order to improve the adhesion with the primer resin. For example, the surface of the concrete may be polished using a disc grinder or the like. Polishing can be performed by a known method, and then dust and the like adhering to the concrete surface are removed. When cross-sectional repair is necessary, the cross-sectional repair may be performed using a known cross-sectional repair material as appropriate.

  Next, a primer is applied to the concrete surface after the surface treatment. This is because the primer treatment increases the adhesion to the concrete surface and increases the affinity with the resin to be injected later to increase the adhesive strength. Examples of the primer include a vinyl ester resin primer.

  The vinyl ester resin used for the primer is generally a polymerizable unsaturated bond formed by a ring-opening reaction between a compound having a glycidyl group (epoxy group) and a carboxyl group of a carboxyl compound having a polymerizable unsaturated bond such as acrylic acid. A compound having vinyl (vinyl ester) is dissolved in a polymerizable monomer such as styrene. For example, polyester resin handbook (Nikkan Kogyo Shimbun, published in 1988), paint glossary (edited by Color Material Association, 1993). This is a resin described in “ When used as a primer, a peroxide catalyst can be added thereto. In particular, as a preferable vinyl ester resin-based primer, Daibo Resin F-800 manufactured by Showa Polymer Co., Ltd. can be mentioned.

Specifically, using a roller brush or the like, a primer is applied to the concrete surface and cured. The amount of the primer to be applied is not particularly limited, but in order to effectively achieve the corrosion protection of the concrete, it is usually about 0.05 to 0.4 kg / m ² , preferably 0. What is necessary is just to apply about 1-0.3 kg / m < ² >.

  A transparent FRP board is installed on the primer-treated concrete surface via ribs. The transparent FRP board should just be resin provided with characteristics, such as transparency, chemical resistance, abrasion resistance, and heat resistance, for example, vinyl ester resin is used. Among them, as a preferable vinyl ester resin, Daibo Resin F-2000 manufactured by Showa Polymer Co., Ltd. can be mentioned. The transparent FRP board may be a laminate of a glass mat and a surface mat as necessary.

  The shape of the transparent FRP board is formed according to the shape of the concrete surface to be constructed. The thickness of the transparent FRP board can be appropriately selected according to the environment in which the target concrete structure is used. However, considering the anticorrosion effect and the construction cost, the thickness may be about 1 to 7 mm. Further, the transparency of the transparent FRP board only needs to have such transparency that the inside of the board can be visually observed.

  Further, in the conventional post-pasting method, as shown in FIG. 3, the back surface (adhesion surface) of the board is provided with a fastener-like protrusion or a magic tape portion, but the back surface of the transparent FRP board of the present invention ( It is not necessary to provide such a portion on the bonding surface.

  As the rib to be used, a resin such as a vinyl ester resin, an epoxy resin, an unsaturated polyester resin, or a (meth) acrylic resin is used. FIG. 4 shows an example of a cross section of the transparent FRP board to which the ribs are bonded as seen from the rib axis direction. This rib is fixed to the concrete surface with an adhesive and serves as a spacer that forms a gap between the concrete surface and the transparent FRP board. The ribs and the transparent FRP board in FIG. 4 are firmly bonded with an adhesive such as a vinyl ester resin adhesive. As a preferable adhesive, Daibo Resin F-30 manufactured by Showa Polymer Co., Ltd. is exemplified.

  The transparent FRP board to which the rib of FIG. 4 is bonded is applied by applying an adhesive to the rib and pressing it against the concrete surface. For bonding the rib and the concrete surface, the same vinyl ester resin adhesive as described above is used. The rib functions as a spacer for supporting the FRP board on the concrete surface, and is arranged so that a certain space (gap) for injecting resin described later is formed between the transparent FRP board and the concrete surface. .

  The thickness of a rib prescribes | regulates the space | interval of said transparent FRP board and a concrete surface, and can be suitably selected according to the objective. Usually, it is about 1 to 8 mm, preferably about 2 to 5 mm.

  The shape of the rib may be a linear shape corresponding to the shape of the concrete surface of the FRP board. A plurality of linear ribs are provided between the transparent FRP board and the concrete surface, so that the expansion of the board during resin injection described later can be suppressed and the resin injection section can be secured at equal intervals. It is preferable to install in. The end of the resin injection section partitioned by the ribs, that is, the open end of the space between the transparent FRP board and the concrete surface is treated with a putty-like adhesive, and the joint portion is further lined. Sealed.

  In addition to the above-described method of bonding the transparent FRP board with the ribs bonded as shown in FIG. 4 to the concrete surface, the space portion is formed by bonding a plurality of ribs to the primer-treated concrete surface. You may employ | adopt the method of adhere | attaching a transparent FRP board on top. Other than that, it can carry out similarly to the above.

  As described above, a plurality of transparent FRP boards are abutted and pasted on the concrete surface and cured. At that time, the generated seam (joint portion) between the boards is subjected to a lining process as follows. After joining the joint of the board with a vinyl ester resin putty, a glass mat and a surface mat are sequentially laminated thereon, and a top coat is applied thereto, followed by curing and curing (see FIG. 5). In FIG. 5, 2M + 1S means two glass mats + one surface mat. The stacking width may be about 100 to 200 mm centering on the joint portion of the board.

  As described above, the transparent FRP board is installed on the concrete surface via the rib, and a space (gap) is provided between the concrete surface and the FRP board.

  Next, a transparent resin is injected into this space. A widely known epoxy resin can be used as the filler, and an epoxy resin mainly composed of bisphenol A is preferable from the viewpoint of transparency, adhesiveness, workability, and the like. As a preferable epoxy resin, Daibo Resin F-20 manufactured by Showa Polymer Co., Ltd. is exemplified.

  The injection process of the transparent resin is shown in FIG. First, holes are made in both ends of the board in each injection section partitioned by ribs to provide resin injection holes and air vent holes. These holes may be provided at the time of board production. An epoxy resin is blended and mixed with a stirrer, and this is put into a hopper of an injection pump. The injection pump and the injection hole of the FRP board are connected by a hose, and the resin is injected from this resin injection hole for each injection section. After injecting until the resin comes out from the air vent hole and visually confirming that the air has been sufficiently removed, the injection hole and the air vent hole are sealed.

  In the construction of a horizontal part such as a ceiling or a floor where air tends to remain, the residual air can be effectively suppressed by appropriately applying negative pressure with a vacuum pump from the air vent hole. Moreover, in order to prevent the swelling of the board due to the injection of the filler, it is preferable to perform the injection every one injection section. In order to suppress deformation of the board and the like, it is preferable that the adjacent injection sections are not continuously performed but one section is opened and the non-injection section is injected after the resin is cured.

  After the resin is cured, the injection hole and the air vent hole are sealed. The processing may be performed by the same method as the joint processing between boards. Thus, a high-quality anticorrosive concrete structure is produced by the concrete anticorrosive sheet lining method of the present invention.

  According to the construction method of the present invention, since the board is highly transparent, it is possible to visually check the flow state of the injected resin and to suppress air accumulation as much as possible. In addition, since the negative pressure can be easily adjusted in the construction of horizontal parts such as the ceiling and the floor, there is an advantage that the construction management of the injection work can be surely performed.

  Moreover, since it is transparent even after the resin is cured, the position and range of the defective portion can be confirmed by visual confirmation, the cutting range of the anticorrosion layer can be minimized, and a highly reliable anticorrosion layer can be formed. Even after the construction, since the deformation (cracks, etc.) of the concrete frame can be visually confirmed, the maintenance of the frame is easy.

  Furthermore, the anticorrosive concrete structure of the present invention is provided with linear ribs as spacers on the back side of the board, so that even if the concrete of the frame changes due to an earthquake, impact, etc., it is easy to repair and reinforce, There is an advantage that damage to the stratum is minimized.

  EXAMPLES Next, although an Example demonstrates this invention further in full detail, this invention is not limited to this.

Example 1
The standard work procedure in the concrete anticorrosion sheet lining method of the present invention is shown below.
(1) Surface treatment process of target concrete The surface of the concrete was polished using a disk grinder or the like. Thereafter, dust or the like adhering to the cocrete surface was removed with a vacuum cleaner. When cross-section repair was necessary, cross-section repair was appropriately performed using a cross-section repair material.
(2) Primer application step Using a roller bucket, 0.15 kg / m ² of vinyl ester resin primer was applied to the concrete surface and cured.
(3) Transparent FRP board pasting process To secure a sheet thickness of 3.5 to 4.0 mm using vinyl ester resin “Daibo Resin F-2000” (manufactured by Showa Polymer Co., Ltd.), # 450 glass Four mats (450 g / m ² ) and one 30P surface mat (30 g / m ² ) were laminated to produce. The liquid contact side became the surface mat surface, and ribs (spacers) having a width of 10 mm were installed at regular intervals with the vinyl ester resin in order to secure a gap of 3 mm on the back surface. The standard dimensions of the board were 1000 mm × 1000 mm, but can be arbitrarily selected (see FIG. 4).

A putty-like vinyl ester resin adhesive “Daibo Resin F-30” (manufactured by Showa Polymer Co., Ltd.) was applied to the rib (spacer) on the back surface of the produced vinyl ester resin FRP plate (hereinafter referred to as “board”). The FRP board is pressed against the concrete surface and the ends of each injection section partitioned by ribs are treated with putty-like adhesive "Daibow Resin F-2000" or "Daibow Resin F-30" to maintain hermeticity. did. Thereafter, the boards were sequentially brought into contact with each other and cured by curing.
(4) Board-to-board seam treatment process For the butting process of the board, the vinyl ester resin “Daibo Resin F-2000”, two # 450 glass mats and one 30P surface mat at the time of board production were sequentially laminated in the field (150 mm width) ) And cured (see FIG. 5).
(5) Resin injection process A hole was made in the board of each injection section partitioned by a rib, and an injection hole and an air vent hole were installed. The filler epoxy resin “Daibo Resin F-20” (manufactured by Showa Polymer Co., Ltd.) was blended at a specified blending ratio and mixed with a stirrer, and the mixed epoxy resin was put into a hopper of an injection pump. The injection pump and the injection hole on the board were connected by a hose, and injection was performed for each injection section. Resin was taken out from the air vent hole, and after visually confirming that the air was sufficiently removed, the injection hole and the air vent hole were closed.

  The ceiling and floor where air tends to remain was appropriately vented by applying a negative pressure with a vacuum pump through the air vent hole. Further, in order to prevent the swelling of the board, the injection is performed every other injection section, and the non-injection section is injected after the resin is cured.

  After the resin was cured, the injection hole and the air vent hole were sealed in the same manner as in the inter-board joint processing step. Thus, the anticorrosion concrete structure of the present invention was manufactured (see FIG. 6). In the obtained anticorrosion concrete structure, almost no air accumulation was observed.

It is an example of a section of frame concrete and a sheet joint surface in a formwork method. It is an example of a section of frame concrete and a sheet joint surface in an embedded formwork method. It is an example of a section of frame concrete and a sheet joint surface in a post-pasting method. It is a cross-sectional example of the transparent FRP board to which the rib of the present invention is bonded. It is an example of a section after joint processing of a transparent FRP board of the present invention. It is an example of construction section of the anticorrosion sheet lining method of concrete of the present invention. It is the figure which showed typically the injection | pouring process of the transparent resin in the anticorrosion sheet lining method of the concrete of this invention.

Claims (9)

  A transparent FRP board is installed on the concrete surface of the concrete structure via ribs, a space is provided between the concrete surface and the transparent FRP board, and a transparent resin is injected into the space and cured. A concrete anticorrosion sheet lining method, wherein the concrete surface and the transparent FRP board are integrated.   The concrete anticorrosion sheet lining method according to claim 1, wherein the concrete surface is subjected to surface treatment and primer application. The transparency FRP board, anticorrosion sheet lining method of the concrete according to claim 1 or 2 is a FRP board containing vinyl ester resin.   Apply a putty-like vinyl ester resin adhesive to the rib on the back of the transparent FRP board, press and paste the transparent FRP board against the concrete surface, and end the section partitioned by the ribs to maintain hermeticity The concrete anticorrosion sheet lining method according to claim 1, 2 or 3, wherein the space portion is provided by treating the portion with a putty-like adhesive.   The concrete anticorrosive sheet lining method according to any one of claims 1 to 4, wherein the transparent resin is an epoxy resin.   The anticorrosion sheet lining method for concrete according to any one of claims 1 to 5, wherein a transparent resin is injected into the space while a negative pressure is applied with a vacuum pump.   The anticorrosion sheet lining method for concrete according to any one of claims 1 to 6, wherein the transparent resin is injected into the space while visually confirming that the transparent resin is filled. The anticorrosion concrete structure manufactured by the anticorrosion sheet lining method of the concrete in any one of the said Claims 1-7.   A corrosion-resistant concrete structure, in which a transparent FRP board is installed on the concrete surface of the concrete structure via a rib, and the space provided between the concrete surface and the transparent FRP board is transparent. An anti-corrosion concrete structure filled with resin.

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