JP2003269088A - Concrete spalling prevention method - Google Patents

Abstract

(57) [Problem] To significantly reduce the working time by shortening the curing time and curing period of a resin material. SOLUTION: A step of performing a section treatment of the concrete, a step of performing a base surface treatment of the concrete, a step of applying a primer to the concrete, a step of performing a first intermediate coating on the concrete surface, and a reinforcing material on the concrete surface And a step of performing a second intermediate coating on the concrete surface, and a step of performing a final coating on the concrete surface, wherein the room temperature curing type is used as the intermediate coating and the finishing coating material. A resin material to which peroxide is added is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete covering portion in a tunnel of a road or a railroad, a balustrade portion or a backside portion of a concrete of a highway or a railway viaduct, a road or a passageway, a work on a railroad facility (concrete piece of concrete). In terms of fall prevention, when facilities such as passages, roads, and railways are placed in the immediate vicinity or directly underneath it, the height of the concrete wall on the underpass side at the road overpass, etc.), the chimney, and the rest period are extremely high. Concerning concrete exfoliation prevention construction method in limited industrial facilities.

[0002]

2. Description of the Related Art A woven fabric, a knitted fabric, a mesh product, or a woven fabric, a knitted fabric, a mesh product, or There is a coating method for coating the surface of concrete with a three-dimensional knit as a reinforcement.
Here, the woven fabric, knitted fabric, meshed fabric, or three-dimensional knitted fabric is made of glass fiber, vinylon fiber, or the like, has a basis weight of about 100 to 1000 g / m ² , and has a thickness of 0.0.
A thin one of 5 to 0.60 mm is used. Also,
When the strength of the reinforcing material is insufficient, a plurality of reinforcing materials may be stacked and used. As a material used for coating, a resin material such as an epoxy resin, polymer cement, or the like is used, which is applied or sprayed.

A series of work contents will be described with reference to FIG. 1 by taking a case of using a resin material as an example. First, in the pre-treatment 1 of step S1, if there is a float on the concrete,
If there are exposed or rusted reinforcing bars, or if there are cracks, perform cross-section processing by the appropriate method. Then step S2
In the pre-treatment 2 of, the surface of the concrete is subjected to surface treatment by sanding or high-pressure washing (for example, 15 MPa),
Apply the primer to the concrete surface in step S3. In step S4, the first intermediate coating is performed, and in step S5, a reinforcing material such as a woven or knitted material, a mesh material, or a three-dimensional knitted material is attached and fixed. Then, the second intermediate coating is performed in step S6, and the final coating is performed in step S7. Depending on the construction method, an anchor pin may be provided to prevent the net from falling off so that the net does not peel off.

Here, the materials used for the primer, the intermediate coating, and the finishing are the permeability and adherence to concrete, the adherence to other coating materials, the penetration and adherence to reinforcing materials, and the weather resistance. , The materials (base compound and curing agent) suitable for each purpose and application are used. Also, the work of each step is subject to time constraints due to the previous process. For example, the work of step S6 is performed immediately after the work of step S5. The work of steps S3, S4, and S7 is provided with a curing period (reference time for splicing) between the work and the previous work. For example, when an epoxy resin material is used for the coating finish of step S6, if the temperature is 5 to 25 ° C., 7 days or more, 30 to 35
If it is ℃, leave a curing period of 3 days or more.

[0005]

By the way, in the case of applying the concrete exfoliation prevention method to transportation facilities such as roads and railroads, the road traffic interruption time should be as short as possible or without interruption. It would be convenient to be able to work in live line construction. Further, if it is a railway facility, it is necessary to efficiently proceed with the work within a short time during the night when there is no train operation, and it is strongly desired to shorten the work time.

However, in the above-mentioned conventional exfoliation prevention construction method, the construction method itself often repeats the same work many times, and a curing period is required between the works, so that the construction period becomes relatively long. Have

The present invention solves the above-mentioned conventional problems, and provides a method for preventing concrete from coming off, which can significantly reduce the working time by shortening the curing time and curing period of the resin material. The purpose is to

[0008]

To this end, in the concrete exfoliation prevention method according to claim 1 of the present invention, a step of performing a cross-section treatment of concrete, a step of performing a surface treatment of the foundation of concrete, and applying a primer to concrete. The step of applying the first intermediate coating to the concrete surface, the step of arranging the reinforcing material on the concrete surface, the step of applying the second intermediate coating to the concrete surface, and the step of applying the finish coating to the concrete surface. In the method for preventing concrete from coming off, a material obtained by adding a peroxide to a room temperature curing type resin material is used as the intermediate coating material and the finishing coating material. A step of performing a cross-section treatment, a step of performing a surface treatment of the concrete base, Applying primer to concrete, applying a first intermediate coating to the concrete surface, placing a reinforcing material on the concrete surface, applying a second intermediate coating to the concrete surface, and finishing the concrete surface In a concrete exfoliation prevention method comprising a step of applying a coating, polymer cement is used as the intermediate coating material and the finish coating material, and the invention according to claim 3 is the reinforcement according to claim 1 or 2. A conductive woven or knitted fabric, a meshed product, or a three-dimensional knitted fabric is used as the material, and the invention according to claim 4 is characterized in that the intermediate coating and finishing coating material according to claim Characterized by mixing conductive fibers into the
The invention according to claim 5 is characterized in that in any one of claims 1 to 4, the resin material is heated from the concrete surface side in the step of the intermediate coating and the finish coating, and the invention according to claim 6 is The method according to claim 1 or 2, wherein in the step of applying the primer, a retardation-curable primer is applied as a primer, a mesh material is applied, and a quick-drying or ordinary polymer cement is applied. The invention of claim 1 is characterized in that in claim 1 or 2, a quick-drying resin material is applied onto the release paper, and the release surface is peeled off after gelling by pressing with a roller on the construction surface of the previous step, The invention according to claim 8 is the method according to claim 1 or 2, wherein the first intermediate coating step, the second intermediate coating step,
A resin holding sheet impregnated with a resin is used for several consecutive steps of the finishing coating, and the resin holding sheet is attached, and the invention according to claim 9 is the same as in claim 1 or 2. The resin holding sheet in which the first intermediate coating step, the reinforcing material arranging step, the second intermediate coating, and the final coating step are all impregnated with resin and further the reinforcing material is arranged, and the resin holding sheet is used. A sheet is attached, and the invention according to claim 10 is the method according to claim 8 or 9, wherein a resin holding sheet is prepared by impregnating a glass mat or the like with a resin material in which a main agent and a curing agent are mixed at low temperature. It is characterized in that it is packed, stored and transported at a low temperature, and the invention according to claim 11 is the resin holding sheet according to any one of claims 8 to 10. After opening the inlet and the hole to be outlet, characterized by inserting under pressure a filler from the inlet.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flow chart for explaining one embodiment of a concrete exfoliation prevention construction method of the present invention.

In FIG. 1, the steps S1 to S3 are:
This is the same as the conventional method described above. That is, step S1
In the pretreatment 1 of 1., if the concrete has a floating portion, a defective portion, an exposed / rusted rebar portion, or a crack, the cross-section treatment is performed by an appropriate method. Next, in the pretreatment 2 of step S2, a ground surface treatment is performed by sanding or high-pressure washing (for example, 15 MPa), and a primer is applied to the concrete surface in step S3.

In this embodiment, in order to shorten the work time after step S4, the following device is incorporated.

[0012]

[First Embodiment] In step S4, a first intermediate coating is performed, in step S5, a reinforcing material such as a woven or knitted fabric, a mesh material, or a three-dimensional knitted fabric is attached and fixed, and in a step S6, a second intermediate coating is performed. , Finish coating in step S7,
In the intermediate coating and finish coating in steps S4, S6, and S7, a room temperature curing type epoxy resin or unsaturated polyester resin is used, and a peroxide is added to accelerate curing. As a result, gelation occurs at 20 ° C in about 30 minutes, and
Hardens in about an hour. However, depending on the shape of the filling portion, it may take a longer time to completely cure the inside.

[0013]

Second Embodiment A quick-drying polymer cement is used in the intermediate coating and finish coating in steps S4, S6, and S7. Here, epoxy or unsaturated polyester is used as the polymer. By using a quick-drying polymer cement, the setting time can be shortened.

[0014]

Third Embodiment A conductive woven or knitted material such as carbon fiber, a mesh, or a three-dimensional knitted material is used as the reinforcing material in step S5, and the reinforcing material is energized to accelerate the hardening of the filler due to the heat generation effect. As the filler here, the above-mentioned epoxy resin, unsaturated polyester resin, or the like is used.

[0015]

Fourth Embodiment In the second embodiment, conductive fibers (carbon fiber, steel fiber, etc.) are mixed in the resin material to be filled.
According to this embodiment, the resin material itself also generates heat when energized, whereby the curing can be further promoted, and the mechanical strength can be increased by mixing the fibers into the resin material. In the present embodiment, the reinforcing material itself made of a woven or knitted material, a mesh material, or a three-dimensional knitted material may or may not be a conductive material.

[0016]

Fifth Embodiment In the first to fourth embodiments, the surface temperature of the resin material to be filled is increased from the concrete surface side by using a heat source such as a heater to accelerate hardening. The curing time can be promptly started after the work without being restricted by the working time of the resin or the quick-drying polymer cement (the time when the work can be taken out from the sealed bag).

[0017]

[Sixth Embodiment] In step S3, a retardation-curable primer is applied in place of a normal primer, a mesh material is applied, and a quick-drying or ordinary polymer cement is applied as an intermediate coating in step S4. Here, the mesh material serves as a reinforcing and mortar-adhering material. Examples of the delayed curing type primer include new and old concrete splicing epoxy resin-based primer (Bond E120 manufactured by Konishi Co., Ltd.).
0, main agent: epoxy resin, curing agent: polythiol-modified alicyclic polyamine), the splicing period is within 2 hours to 3 days.

According to the present embodiment, quick-drying or strong bonding with ordinary polymer cement is achieved, the mechanical strength after curing is excellent, and application to a wet surface is possible. Further, since the primer does not dry for about 3 days after application, the reinforcing material can be easily installed. Several days (2 or 3 days) without waiting for drying
You can set up a work procedure divided into.

[0019]

[Seventh Embodiment] In steps S4, S6, and S7, a quick-drying resin material is applied onto the release paper, and the release paper is peeled off after being gel-pressed with a roller on the work surface of the previous work. By completing the work of applying the quick-drying resin material on the release paper in advance, the working time can be shortened and the quality of the work of applying the resin material can be made uniform. In addition, the materials do not scatter around and the surrounding equipment and facilities are not polluted. Also, if the size of the release paper is not too large, it will be easy to carry out the work while avoiding overhead lines.

[0020]

[Embodiment 8] In Embodiment 6, instead of directly applying a quick-drying or ordinary polymer cement,
Similar to the embodiment, a quick-drying or ordinary polymer cement is pre-coated on the release paper and pressure-bonded with a roller,
After curing, release paper is peeled off.

[0021]

[Embodiment 9] In Embodiments 1 to 8, the resin is applied, but in the present embodiment, as shown in FIG. 2, the intermediate coating in steps S14, S16, S17,
In the final coating, a resin holding sheet such as a glass mat is prepared from a resin material in which a main agent such as an epoxy resin and a curing agent are mixed before being brought into the field. Here, a material having a long pot life is used, and this sheet is brought to the site and attached to the exfoliation prevention part. Positioning of the sheet, pressure bonding to the surface with rollers, etc., degassing of air, etc. are completed within the pot life, and the sticking work is completed. In addition to the glass mat, organic resin such as polyester resin may be used for the resin holding sheet.

[0022]

[Embodiment 10] In this embodiment, as shown in FIG. 3, the first intermediate coating, the arrangement of the reinforcing material, the second intermediate coating,
The continuous or some of the work of the finish coating was impregnated with resin and further combined with a reinforcing material.
A sheet of resin holding sheet is provided, and this resin holding sheet is carried into the site, and only the sticking work of step S24 is performed on the site.

FIG. 4 is a schematic sectional view showing a specific example of the tenth embodiment. In the figure, 1 is a concrete foundation, 2 is a primer, 3 is a resin-impregnated glass mat (resin holding sheet), and 4 is a reinforcing material made of a mesh material. The figure (A) arranges the reinforcing material 4 inside the glass mat 3, the figure (B) arranges the reinforcing material 4 above the glass mat 3, and the figure (C) shows the reinforcing material 4 below the glass mat 3. An example of arranging on the side is shown. By arranging the reinforcing material 4 on the lower side or the upper side of the glass mat 3, it is possible to reduce the time and effort for manufacturing the sheet, and by separating the reinforcing material 4 from the glass mat 3, it is possible to improve workability in the field. You can

[0024]

Embodiment 11 In Embodiments 9 and 10, 2 to 5 ° C.
A resin holding sheet is prepared by impregnating a glass mat or the like with a resin material in which a main agent and a curing agent are mixed at a low temperature, and is packaged, stored and transported at a low temperature. Here, since the resin holding sheet is kept at a low temperature, the hardening of the resin material has stopped, or an extremely slow hardening reaction has proceeded.
Bring this resin holding sheet to the site and attach it to the exfoliation prevention area. Generally, since the temperature inside the tunnel is about 20 ° C, the sheet is warmed to the ambient temperature and the curing reaction proceeds. During that time, the sheet is positioned, pressure-bonded to the surface by rollers, air defoaming work, etc. Finish the work. Since the curing time of the resin is a normal time, the resin holding sheet is effective when applied to Example 10 in which all the steps after the first intermediate coating are completed in one time.

According to this embodiment, it is possible to obtain the effect of shortening the time for the concrete exfoliation prevention work by using the existing material (almost general purpose resin material) only by manufacturing, storing and transporting the resin holding sheet at a low temperature. .

[0026]

[Embodiment 12] In the case where the resin holding sheets of Embodiments 9 to 11 are attached, the work efficiency is improved in a normal portion, but for example, an opening portion, a step (uneven) is formed in the covering portion,
If there is equipment such as a ladder and fine features are required, the application of the resin material according to the first embodiment is changed. According to the present embodiment, by combining the application of the resin holding sheet and the application of the resin material, it is possible to proceed with the work in details without lowering the efficiency.

[0027]

Thirteenth Embodiment The resin holding sheets of the ninth to eleventh embodiments are carefully attached by an operator, and by applying a roller or the like, close contact and air defoaming are performed. However, there is a case where air is trapped on the back surface of the sheet due to a short working time or carelessness. In such a case, when it is determined that there is a functional problem in the found air pocket after the sheet is cured, the following measures are taken.

First, holes are formed in the sheet as an inlet and an outlet for venting air. Do not scratch the reinforcement during this operation. Next, a filler made of a resin having low viscosity is inserted by applying pressure from the inlet. At this time, a slight negative pressure may be applied to the outlet. The filling is completed when the filling material is filled in the air reservoir and the filling material overflows from the outlet. After that, wait for the filling material to harden. Furthermore, when it is determined that air is large and there is a problem in strength simply by inserting a filler, a holding sheet may be attached to the surface of the relevant portion to reinforce the strength.

[0029]

As is apparent from the above description, according to the present invention, the working time can be significantly reduced by shortening the curing time and the curing period of the resin material. As a result, the following effects are obtained. Is played. (1) During construction related to transportation facilities, the time for traffic interruptions can be greatly reduced, and the burden on users and the impact on road congestion can be suppressed. (2) In the construction related to railway facilities, the work can be efficiently carried out within a short time during the night when there is no train operation. (3) Since work efficiency can be improved, it is possible to construct a large area within a given time. (4) When the resin holding sheet is used, the thickness and the like can be easily controlled, the control of the state of the coating film can be omitted, and the quality can be improved. (5) When a resin holding sheet is used, materials such as resin do not scatter around and the surrounding equipment and facilities are not polluted.

[Brief description of drawings]

FIG. 1 is a flow chart for explaining one embodiment of a concrete exfoliation prevention construction method of the present invention.

FIG. 2 is a flow chart for explaining another embodiment of the concrete exfoliation prevention construction method of the present invention.

FIG. 3 is a flowchart for explaining another embodiment of the concrete exfoliation prevention construction method of the present invention.

FIG. 4 is a schematic cross-sectional view showing a specific example of the embodiment shown in FIG.

Claims (11)

[Claims] Claim: What is claimed is: 1. A step of treating a section of concrete, a step of treating a surface of an underlayer of concrete, a step of applying a primer to concrete, a step of applying a first intermediate coating on the concrete surface, and a step of reinforcing the concrete surface. In a concrete exfoliation prevention construction method comprising a step of arranging materials, a step of secondly applying an intermediate coating on the concrete surface, and a step of applying a final coating on the concrete surface, a room temperature curing type as the intermediate coating and the final coating material. Concrete exfoliation prevention method characterized by using a resin material with a peroxide added. 2. A step of performing a cross-section treatment of concrete, a step of performing a surface treatment of concrete, a step of applying a primer to concrete, a step of applying a first intermediate coating to the concrete surface, and a step of reinforcing the concrete surface. In a concrete exfoliation prevention method comprising a step of arranging a material, a step of secondly applying an intermediate coating on the concrete surface, and a step of applying a final coating on the concrete surface, polymer cement is used as the intermediate coating and the final coating material. A concrete exfoliation prevention method characterized by being used. 3. The concrete exfoliation prevention method according to claim 1, wherein an electrically conductive woven or knitted fabric, a mesh or a three-dimensional knitted fabric is used as the reinforcing material. 4. The concrete exfoliation prevention method according to any one of claims 1 to 3, wherein electrically conductive fibers are mixed in the intermediate coating material and the finish coating material. 5. The concrete exfoliation prevention method according to claim 1, wherein the resin material is heated from the concrete surface side in the steps of the intermediate coating and the finish coating. 6. In the step of applying the primer,
3. A delayed hardening type primer is applied as a primer, a mesh material is applied, and a quick-drying or ordinary polymer cement is applied.
Concrete peeling prevention method described. 7. A quick-drying resin material is applied on a release paper, and is pressure-bonded with a roller to the construction surface of the previous step, and after gelation,
The concrete peeling prevention method according to claim 1 or 2, wherein the release paper is peeled off. 8. A resin-holding sheet impregnated with a resin is used in several successive steps of the first intermediate coating step, the second intermediate coating step, and the final coating step. The method for preventing concrete from falling off according to claim 1 or 2, characterized in that the method is applied. 9. A resin holding sheet having resin impregnated therein and further having a reinforcing material disposed in all the steps of the first intermediate coating step, the reinforcing material arranging step, the second intermediate coating step and the finishing coating step. The method for preventing concrete from falling off according to claim 1 or 2, wherein the resin holding sheet is attached. 10. A resin holding sheet in which a glass mat or the like is impregnated with a resin material prepared by mixing a main agent and a curing agent at a low temperature, and the resin holding sheet is packed, stored and transported at a low temperature. Alternatively, the method for preventing concrete from falling off according to 9. 11. The resin holding sheet is provided with a hole serving as an inlet and an outlet for venting air, and then a filler is inserted under pressure from the inlet.
The method for preventing concrete from falling off according to any one of 1.