JPH0742228A - Repairing method of concrete un-filled cavity in corrosion protective sheet lining method - Google Patents

Abstract

PURPOSE:To make it possible to bond firmly a cement group filler filled up in a concrete un-filled cavity area produced in a corrosion protective sheet lining construction method with concrete and repair definitely the concrete un-filled cavity area, thereby eliminating any potential trouble that both the corrosion protection sheet and the cement group filler may be separated from the concrete together. CONSTITUTION:In terms of a corrosion protective sheet lining method in which a synthetic resin-made corrosion protective sheet 3 forming a projected part 3a on a single surface is temporarily mounted to the inside of a form and concrete 2 is cast into the form, an anchor pin insertion hole 5 is drilled on a concrete un-filled cavity area 4 after the form is removed and an anchor pin 6 whose head is expanded out, is planted into and fixed with the concrete surface of the hollow area. A filler injection hole 9 and an air vent hole 8 are drilled on the corrosion protective sheet 3 while the anchor pin insertion hole 5 is closed and a cement group filler is filled up in the cavity area 4 from the filler injection hole 9. Or a resin-made added lever is connected to the anchor pin 6 and fixed. The head of the added lever and the corrosion protective sheet 3 are welded with resin. In a similar manner, the filler injection hole 9 and the air vent hole 8 are drilled so that the concrete group filler may be filled up in the cavity area 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a concrete-unfilled hollow portion in an anticorrosive sheet lining method such as a concrete sewage treatment tank or a chemical solution tank.

[0002]

2. Description of the Related Art The surface of concrete such as a concrete sewage treatment tank is easily corroded, and in severe cases, it may be corroded enough to expose the reinforcing bars inside the concrete.
It is considered that the main cause is that hydrogen sulfide generated by anaerobic decomposition of organic matter in sewage dissolves in water to become strongly acidic sulfuric acid, and this sulfuric acid corrodes the concrete surface.

In addition, the concrete pharmaceutical liquid tank and the processing liquid tank in the chemical factory are often eroded on the concrete surface by the chemical liquid and the processing liquid.

[0004] In order to prevent this, the anticorrosive sheet lining method of applying a primer to the surface of concrete and adhering the anticorrosive sheet has been conventionally used. However, this method has a problem that the anticorrosion sheet is apt to be peeled off from the concrete surface because the anticorrosion sheet has a weak fixing strength.

In order to deal with such a problem, as shown in FIG. 8, a synthetic resin anticorrosion sheet 3 having inner and outer molds 1a and 1b installed and projections 3a formed on one surface is used.
Temporarily fix it to the inner surface of the concrete, and then add concrete 2 to the formwork 1a, 1b.
The anti-corrosion sheet lining method of placing inside of the has been recently developed. This method is used for formwork 1 after hardening of concrete.
A continuous anticorrosion sheet layer can be formed on the surface of the concrete 2 by simply removing a and 1b and welding the seam of the anticorrosion sheet 3 with resin, and the projections 3a of the anticorrosion sheet 3 can be formed on the surface of the concrete 2. There is no need to worry about sheet peeling because it is firmly fixed in the bite state.

However, in the above-mentioned anticorrosion sheet lining method, a concrete unfilled cavity 4 may be formed on the back surface side of the anticorrosion sheet 3 as shown in FIG. When the concrete unfilled cavity 4 is generated in this way, until now, the filler injection hole and the air vent hole are punched in the anticorrosion sheet 3, and the cement filler (not shown) is passed through the filler injection hole to the cavity. No. 4 was filled, and the filling hole and the air vent hole were welded and sealed with resin after the filling, but this repairing method had the following problems.

[0007]

That is, by only filling the concrete-unfilled cavity 4 with the cement-based filler as in the above-mentioned repair method, the anticorrosive sheet 3 becomes the cement-based filler due to the anchoring action of the protrusions 3a. Even if firmly adhered, the adhesion between the concrete 2 and the cement-based filler is small, so that there is a problem that the anticorrosion sheet 3 becomes integrated with the cement-based filler and easily peels off from the concrete 2.

The present invention has been made in view of the above problems, and it is an object of the present invention that the cement-based filler filled in the concrete-unfilled cavity is firmly fixed to the concrete, and the anticorrosive sheet is the cement-based filler. It is to provide a repair method that does not have the risk of peeling off from concrete in combination with.

[0009]

In order to achieve the above object, the repair method according to the first aspect of the present invention is that a synthetic resin anticorrosion sheet having protrusions formed on one surface is temporarily fixed to the inner surface of a mold to remove concrete. In the anticorrosion sheet lining method of placing inside the formwork, after removing the formwork, perforating an anchor pin insertion hole in the anticorrosion sheet of the concrete unfilled hollow part, the anchor pin with a bulged head is the above-mentioned cavity Implanted and fixed on the concrete surface of the part, while forming a filler injection hole and an air vent hole in the anticorrosion sheet, closing the anchor pin insertion hole, and filling the cement-based filler from the filler injection hole into the cavity. It is characterized by that.

The repair method according to the second aspect of the present invention is the same corrosion protection sheet construction method as described above, wherein an anchor pin insertion hole is formed in the corrosion protection sheet of the cavity not filled with concrete, and the anchor pin is formed on the concrete surface of the cavity. In addition to implanting and fixing, the joint rod made of synthetic resin is connected and fixed to the anchor pin, the end of the joint rod exposed from the anchor pin insertion hole and the anticorrosion sheet are welded with resin, and the filler injection hole is formed in the anticorrosion sheet. It is characterized in that an air vent hole is bored and the above-mentioned cavity is filled with a cement-based filler from a filler injection hole.

[0011]

In the repair method according to the first aspect of the present invention, the bulged head portion of the anchor pin implanted and fixed on the concrete surface of the concrete-unfilled hollow portion bites into the cement-based filler filled in the hollow portion, Since the concrete surface and the cement-based filler are firmly fixed and integrated, there is no concern that the anticorrosive sheet will peel off from the concrete together with the cement filler.

Further, in the repairing method according to the second invention, the concrete surface of the cavity and the anticorrosion sheet are combined and integrated via the anchor pin and the joint rod fixedly connected to the pin, and thus the anticorrosion sheet is similarly formed. However, there is no concern that it will come off from the concrete with the cement-based filler.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 are partial sectional views for sequentially explaining one embodiment of a repairing method according to the first invention.

According to this embodiment, after removing the formwork as shown in FIG. 1, a suitable number of anchor pin insertion holes 5 are drilled in the anticorrosion sheet 3 where the concrete unfilled cavity 4 is formed. Anchor pin 6 pierced with
Is fixed to the surface of the concrete 2 in the cavity 4 through the respective anchor pin insertion holes 5.

The anchor pin 6 may be of a type that is fixed to the concrete 2 with a resin adhesive, or of a type that expands the pin and is fixed to the concrete 2.
The head shape of the anchor pin may be, for example, a T-shaped cross section, a mushroom shape, or any other shape that swells so that it cannot be pulled out.
On the other hand, the anticorrosion sheet 3 is a sheet made of a synthetic resin having good corrosion resistance and chemical resistance, such as polyvinyl chloride, polypropylene, polyethylene, etc., and as shown in FIG. 7, a large number of protrusions 3a are staggered on one side of the sheet. It is formed by being dispersed in
The protrusion 3a has a shape in which a pair of protrusions 31a, 31a inclined in directions away from each other are connected by an intermediate connecting piece 32a. The shape of the protrusion 3a is the anchor pin 6 described above.
As long as it has a shape in which the tip bulges out and does not come out like the head shape of the above, instead of the staggered projections 3a, rib-like continuous projections are formed in parallel at regular intervals. Of course, a resin anticorrosion sheet can also be used.

When the anchoring of the anchor pin 6 is completed, the anchor pin insertion hole 5 is closed with an adhesive tape 7 or the like as shown in FIG. 2, and an air vent hole is formed in the portion of the anticorrosion sheet 3 near the upper and lower ends of the cavity 4. 8 and the filler injection hole 9 respectively,
The cement-based filler 10 is injected and filled into the cavity 4 through the injection hole 9. As the cement-based filler 10, for example, cement milk or polymer cement is preferably used. Then, when the cement-based filler 10 hardens, the adhesive tape 7 is peeled off, and as shown in FIG. 3, the anchor pin insertion hole 5, the air vent hole 8, and the filler injection port 9 are welded and sealed with the same resin 11 as the anticorrosion sheet 3. Then, the repair work is completed.

When the concrete-unfilled hollow portion 4 is repaired as described above, the bulging head of the anchor pin 6 which is planted and fixed on the concrete surface of the hollow portion 4 bites into the cement-based filling material 10 in a non-pullable manner. With anticorrosion sheet 3
Since the protrusion 3a also bites into the cement-based filler 10 without being able to be extracted, the concrete 2, the cement-based filler 10 and the anticorrosion sheet 3 are firmly fixed and integrated. Therefore, there is no concern that the anticorrosion sheet 3 will peel off from the concrete 2 together with the cement filler 10 as in the conventional case.

4 to 6 are partial sectional views for sequentially explaining one embodiment of the repairing method according to the second invention.

According to this embodiment, after removing the formwork as shown in FIG. 4, a suitable number of anchor pin insertion holes 5 are drilled in the anticorrosion sheet 3 where the concrete unfilled cavity 4 is formed. The anchor pins 6a are planted and fixed to the surface of the concrete 2 in the hollow portion 4 through the anchor pin insertion holes 5 respectively. Then, a joint rod 6b made of a synthetic resin similar to that of the anticorrosion sheet 3 is connected and fixed to the anchor pin 6a.

The anchor pin 6a may be of a type that is fixed to the concrete 2 with a resin adhesive as in the case of the anchor pin 6 or of a type that expands the pin and is fixed to the concrete 2. Unlike the anchor pin 6 of No. 3, a screw rod is provided at one end. On the other hand, the joint rod 6b is provided with a threaded tubular portion at one end, and the threaded tubular portion can be screwed into the threaded rod portion of the anchor pin 6a so as to be firmly connected to the anchor pin 6a.
The joint rod 6b has a length such that the other end thereof is slightly exposed from the anchor pin insertion hole 5 of the anticorrosion sheet 3 when connected to the anchor pin 6a. The anticorrosion sheet 3 is the same as above.

When the anchoring work of the anchor pin 6a and the connecting work of the joint rod 6b are completed, as shown in FIG.
The end of the joint rod 6b exposed from the anchor pin insertion hole 5 and the anticorrosion sheet 3 are welded with the same resin 11 as the anticorrosion sheet 3, and the air vent hole 8 and the filler injection hole 9 are further punched in the anticorrosion sheet 3. Then, the same cement-based filler 10 as described above is injected and filled from the injection hole 9 into the cavity 4. When the cement-based filler 10 hardens, the air vent 8 and the filler injection port 9 are welded and sealed with the resin 11 as shown in FIG. 3, and the repair work is completed.

When the concrete-unfilled hollow portion 4 is repaired as described above, the concrete surface of the hollow portion 4 and the anticorrosion sheet 3 are firmly bonded and integrated via the anchor pin 6a and the joint rod 6b, and the cement-based filling is performed. The fixing force between the material 10 and the concrete 2 is also improved by the anchor pin 6a and the joint rod 6b. Therefore, as in the case of the repair method described above, there is no concern that the anticorrosion sheet 3 will peel off from the concrete 2 together with the cement-based filler 10.

[0024]

As is apparent from the above description, both the repair method according to the first invention and the repair method according to the second invention are
It is possible to surely repair the concrete-unfilled hollow portion on the back side of the anticorrosion sheet so that the anticorrosion sheet does not come off from the concrete surface together with the cement-based filler.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a state where an anchor pin is planted and fixed on a concrete surface of a concrete-unfilled hollow portion in an embodiment of a repairing method according to the first invention.

FIG. 2 is a partial cross-sectional view showing a state where a cement-based filler is injected and filled into a concrete-unfilled hollow portion in the example.

FIG. 3 is a partial cross-sectional view showing that the anchor pin insertion hole, the air vent hole, and the filler injection hole are welded and sealed with resin after the cement-based filler is cured in the same example.

FIG. 4 is a partial cross-sectional view showing that an anchor pin is planted and fixed on a concrete surface of a concrete-unfilled hollow portion and a joint is connected and fixed to the anchor pin in an embodiment of a repairing method according to the second invention. is there.

FIG. 5 is a partial cross-sectional view showing the joint rod and the anticorrosion sheet welded with resin in the same embodiment, and the cement-based filler is injected and filled into the concrete-unfilled cavity.

FIG. 6 is a partial cross-sectional view showing a state where the air vent hole and the filler injection hole are welded and sealed with resin after the cement-based filler is cured in the same example.

[Explanation of symbols]

 2 Concrete 3 Anticorrosion sheet 3a Protrusion 4 Concrete unfilled cavity 5 Anchor pin insertion hole 6, 6a Anchor pin 6b Joint rod 8 Air vent hole 9 Filler injection hole 10 Cement-based filler

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 21, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a state where an anchor pin is planted and fixed on a concrete surface of a concrete-unfilled cavity in an embodiment of a repairing method according to the first invention.

FIG. 2 is a partial cross-sectional view showing a concrete-filled cavity filled with cement-based filler in the same example.

FIG. 3 is a partial cross-sectional view showing that the anchor pin insertion hole, the air vent hole, and the filler injection hole are welded and sealed with resin after the cement-based filler is cured in the same example.

FIG. 4 is a partial cross-sectional view showing that an anchor pin is planted and fixed on a concrete surface of a concrete-unfilled hollow portion and a joint is connected and fixed to the anchor pin in one embodiment of the repair method according to the second invention. is there.

FIG. 5 is a partial cross-sectional view showing the joint rod and the anticorrosion sheet welded with resin in the same example, and the cement-based filler is injected and filled into the concrete-unfilled cavity.

FIG. 6 is a partial cross-sectional view showing a state where the air vent hole and the filler injection hole are welded and sealed with resin after the cement-based filler is cured in the same example.

FIG. 7 is a perspective view showing an example of an anticorrosion sheet used in the present invention.

FIG. 8 is a partial cross-sectional view illustrating a conventional anticorrosion sheet lining method.

[Explanation of symbols] 2 Concrete 3 Anticorrosion sheet 3a Protrusion 4 Concrete unfilled cavity 5 Anchor pin insertion hole 6, 6a Anchor pin 6b Joint rod 8 Air vent hole 9 Filler injection hole 10 Cementitious filler

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takao Tagawa, 4-640 Shimoseido, Kiyose-shi, Tokyo Obayashi Technical Research Institute Co., Ltd.

Claims (2)

[Claims] 1. In an anticorrosive sheet lining method in which a synthetic resin anticorrosion sheet having protrusions formed on one surface is temporarily fixed to the inner surface of the formwork and concrete is placed inside the formwork, after removing the formwork, Anchor pin insertion holes are punched in the anticorrosion sheet of the concrete-unfilled cavity, and the anchor pin with a bulging head is planted and fixed on the concrete surface of the cavity, and the filler injection holes and air vent holes are provided in the anticorrosion sheet. A method of repairing a concrete-unfilled hollow portion in a corrosion-proof sheet lining method, which comprises drilling and closing an anchor pin insertion hole to fill the hollow portion with a cement-based filler from a filler injection hole. 2. In the anticorrosive sheet lining method of temporarily fixing a synthetic resin anticorrosion sheet having protrusions formed on one surface to the inner surface of the formwork and placing concrete inside the formwork, after removing the formwork, Anchor pin insertion holes are drilled in the anticorrosion sheet of the concrete-unfilled cavity, and the anchor pin is planted and fixed on the concrete surface of the cavity, and a joint rod made of synthetic resin is connected and fixed to the anchor pin, and the anchor. The end of the joint bar exposed from the pin insertion hole and the anticorrosion sheet are welded with resin, and the filler injection hole and the air vent hole are punched in the anticorrosion sheet, and the above-mentioned cavity is filled with the cement filler from the filler injection hole. A method for repairing a cavity not filled with concrete in the anticorrosion sheet lining method, which comprises: