JP3517018B2 - Protection method of concrete edge in buried formwork - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for protecting a concrete edge constructed by using an embedded formwork, and in particular, an on-site concrete for a top end portion when the embedded formwork is used for placing concrete such as masscon. The present invention relates to a method of protecting the boundary part of an embedded formwork.

[0002]

2. Description of the Related Art Conventionally, when an embedded formwork is used in a masscon or the like, the edge of the mold and the concrete at the top end is cut off due to the drying shrinkage of the masscon or the like, and a deterioration factor enters and causes corrosion. Conventionally, as a countermeasure against this, a method has been adopted in which a sealing material is directly applied to the boundary between the formwork and concrete, or a groove is provided and the sealing material is poured.

[0003]

At the same time, however, such a conventional method of directly applying a sealing material to the boundary surface between the mold and the concrete on site does not look good. Further, since the sealing material is applied to the upper portion where the adhesion is cut off, it is not a fundamental solution, and there is a problem that there is a high risk that the adhesion of the sealing material is cut off again.

In order to solve such problems in the prior art, an object of the present invention is to cover a fiber reinforced plastic (hereinafter referred to as FRP) section having an L-shaped cross section at a boundary surface between a formwork used for a mask and the like and on-site concrete. The purpose of the present invention is to provide a method of protecting concrete boundary portions, particularly concrete edges, of a buried formwork by installing the, so that deterioration factors do not enter even if the adhesion is broken.

[0005]

In order to achieve the above-mentioned object, according to the present invention, a method for protecting concrete edges in an embedded formwork is as follows. An FRP cover with an L-shaped cross section is bonded to the boundary between the embedded mold and the
It is characterized in that an appropriate sealing material or the like is applied to the end portion of the P cover.

[0006]

In the protection method of the present invention as described above, regardless of whether the ceiling is provided with a water gradient or not when the buried formwork is used for pouring concrete such as masscon. Instead, by arranging a FRP cover with an L-shaped cross section with high corrosion resistance at the boundary between the mask and the embedded formwork, and adhering and protecting it with an epoxy adhesive, and applying a sealing material such as a silicone sealing material to the edges. Even if the adhesion between the formwork and the site concrete is cut off due to drying shrinkage, the deterioration factor does not penetrate into the cut part, and the boundary surface between the formwork and concrete at the top end part, which was previously considered a weak point, Can be protected.

Other objects, features and advantages of the present invention will become apparent from the following detailed description in conjunction with the accompanying drawings.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 of the drawings shows a first embodiment of the method for protecting concrete edges in a buried form according to the present invention. As shown in the drawing, this embodiment is applied to the top of concrete. In the case where a water gradient is provided, the top of the concrete 1 such as on-site concrete is at a level about 50 to 100 mm lower than the top of the buried formwork 2 for providing a water gradient. Therefore, in order to protect the boundary surface 3 between the concrete 1 and the buried formwork 2, an FRP having an L-shaped cross section as shown in the figure.
The cover 4 is adhered to the embedded formwork 2 with, for example, an epoxy adhesive 5, the mortar 6 is cast, and the FRP cover 4
The end portion of is sealed with, for example, a silicon-based sealing material 7.

In the illustrated embodiment, an epoxy adhesive is used as the adhesive. However, in addition to the epoxy adhesive, a phenol resin, a resorcin resin, a urea resin, an unsaturated polyester resin, a furan resin, a polyurethane resin, and acetic acid are used. An adhesive such as a vinyl resin, a polyvinyl alcohol resin, a propylal resin can be used. Although a silicone-based sealing material was used as the sealing material, in addition to the silicone-based sealing material, a butyl rubber-based sealing material, a polyurethane-based sealing material, an acrylic rubber-based sealing material, a chlorosulfonated polyethylene-based sealing material, and a rubber epoxy. A system-based sealing material, an asphalt-based sealing material, etc. can be used.

As described above, after the concrete 1 is cast by using the buried form 2 so that the top of the concrete 1 has a water gradient, the FRP cover 4 is appropriately attached to the top of the buried form 2 by using epoxy or the like. Glue it to the embedded formwork 2 with a simple adhesive 5 and then
Since the mortar 6 is cast and the end portion of the FRP cover 4 is sealed with an appropriate sealing material 7 such as silicon,
The boundary surface between the concrete 1 and the buried formwork 2 can be suitably protected, and the concrete surface 1 and the buried formwork 2 on the boundary surface 3 can be protected.
Even if the adherence of the material is cut off, it is possible to sufficiently prevent the penetration of deterioration factors and the like.

FIG. 2 shows a second embodiment of the method for protecting concrete edges in a buried form according to the present invention. As shown in the drawing, this embodiment does not have a water gradient at the top. In some cases, the top of concrete 1, such as site concrete, is at the same level as the buried formwork 2. In such a case, as in the case of FIG. 1, the FRP cover 4 having an L-shaped cross section is used to bond the FRP cover 4 to the concrete 1 and the buried form 2 with an appropriate adhesive 5 such as epoxy. Then, the end portion of the FRP cover 4 is sealed with respect to the concrete 1 and the embedded formwork 2 by an appropriate sealing material 7 such as a silicon-based material. Needless to say, the adhesive and sealing material used in this second embodiment can be appropriately selected from the group of adhesives and silicon materials described above.

Thus, also in this second embodiment,
Concrete such as on-site concrete at the same level 1
The FRP cover 4 is adhered to the concrete 1 and the embedded formwork 2 with an appropriate adhesive 5 such as epoxy on the top of the embedded formwork 2 and the end of the FRP cover 4 is made of a suitable sealing material such as silicone. Since the sealing is performed with 7, the boundary surface between the concrete 1 and the buried form 2 can be protected appropriately, and even if the adhesion between the concrete 1 and the buried form 2 on the boundary 3 is cut off, deterioration factors and the like can be sufficiently infiltrated. Can be prevented.

[0013]

As described above, the method for protecting the concrete edge of the buried formwork according to the present invention can be applied to the top end of a concrete frame such as a masscon when the buried formwork is used for placing concrete. An FRP with an L-shaped cross section that has excellent durability and excellent corrosion resistance at the boundary surface between concrete and buried formwork, regardless of whether a water gradient is applied or not.
The cover is placed and protected by adhering with an epoxy adhesive, and the concrete and the buried formwork are sealed at the end of the FRP cover with a silicone-based sealing material, etc. Even if the concrete adheres, the deterioration factor does not penetrate into the cut part, and it is possible to satisfactorily protect the boundary surface between the buried formwork and the concrete at the top end, which was conventionally a weak point, It is possible to overcome the problem that deterioration factors enter from the interface between the buried formwork and concrete.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a structure in which an embedded formwork is applied to a masscon or the like in the present invention, in the case where a water gradient is added to the top end.

FIG. 2 is a sectional view similar to FIG. 1, showing a case where no water gradient is added to the crown.

[Explanation of symbols]

1 concrete 2 buried formwork 3 boundaries 4 FRP cover 5 adhesive 6 mortar 7 Sealant

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-230869 (JP, A) JP-A-6-173385 (JP, A) JP-A-58-58348 (JP, A) Actual Kaihei 2- 5512 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04B 2/86 E04B 1/62-1/99

Claims (5)

(57) [Claims] 1. After pouring concrete using an embedded formwork, an FRP cover having an L-shaped cross section is adhered to the boundary between the concrete and the embedded formwork with an appropriate adhesive, and an appropriate sealing material or the like is applied to the ends. A method for protecting concrete edges in an embedded formwork, which is characterized by applying a ceiling. 2. The adhesive is selected from the group consisting of epoxy resin, phenol resin, resorcin resin, urea resin, unsaturated polyester resin, furan resin, polyurethane resin, vinyl acetate resin, polyvinyl alcohol resin, petitral resin and the like. It is one of the following types: 1.
Method for protecting concrete edges in the described buried formwork. 3. The sealing material is a silicone-based sealing material, a butyl rubber-based sealing material, a polyurethane-based sealing material, an acrylic rubber-based sealing material, a chlorosulfonated polyethylene-based sealing material, a rubber-like epoxy-based sealing material, an asphalt-based sealing material, etc. The method for protecting a concrete edge in a buried formwork according to claim 1, wherein the method is one kind selected from the group. 4. An FRP cover having an L-shaped cross section is adhered to the boundary between the concrete and the buried formwork with an appropriate adhesive when the concrete having a water gradient at the top is cast using the buried formwork. Then, a method for protecting concrete edges in a buried formwork, which comprises placing mortar and sealing the end of the FRP cover with an appropriate sealing material or the like. 5. The adhesive is selected from the group consisting of epoxy resin, phenol resin, resorcin resin, urea resin, unsaturated polyester resin, furan resin, polyurethane resin, vinyl acetate resin, polyvinyl alcohol resin, petitral resin and the like. The sealing material is a silicone-based sealing material, a butyl rubber-based sealing material, a polyurethane-based sealing material, an acrylic rubber-based sealing material,
The concrete edge of the buried formwork according to claim 4, which is one selected from the group consisting of a chlorosulfonated polyethylene-based sealing material, a rubber-like epoxy-based sealing material, and an asphalt-based sealing material. How to protect.