JP2023092706A - Protection structure for wall surface of concrete structure and construction method of protection structure for wall surface - Google Patents

Abstract

To provide a protection structure capable of keeping a protection function for a wall surface of a concrete structure for a long period.SOLUTION: A protection structure A is configured to laminate a permeable layer 2 provided with permeability and nonflammability on a surface of finishing material T pasted on a wall surface 10 of a concrete structure 1 as well as laminate a net-like body 3 so as to be included in the permeable layer, wherein solution with permeability, nonflammability, and curability impregnated in the net-like body is cured to form the permeable layer.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a wall protective structure in a concrete structure and a construction method for the wall protective structure in a concrete structure.

The walls of concrete structures are protected by applying finishing materials, painting, etc., but deterioration of the protective function due to deterioration over time cannot be avoided, so regular visual inspection and repair of the walls of concrete structures are required. are doing.
As a protective structure for protecting the wall surface of a concrete structure, a structure for protecting the wall surface of a highway tunnel is exemplified.
Regarding the protective structure of the tunnel wall, it is applied to protect the tunnel wall and reflect the headlights of automobiles so that the driver can recognize the position of the wall.

Protective structures for the walls of such tunnels include:
(1) A protective structure in which painted interior panels or interior panels with finishing materials (tiles) attached to the panels are attached to the walls of the tunnel using anchors;
(2) Protective structure with painted walls of the tunnel,
(3) A protective structure in which tiles are directly attached to the walls of the tunnel,
etc. have been proposed.

In the protective structure of (1), the surface of the interior panel is not stained by water leakage from the concrete wall surface, and in the case of the interior panel with tiles, the resistance to washing of the tiles is high, and the reflectance can be maintained for a long time.
However, when checking the state of the concrete on the wall, the interior panel is removed, but it was difficult to remove the heavy interior panel in the limited work time.
In addition, there is a risk that the anchor will come off the wall surface due to deterioration over time, and the interior panel will come off the wall surface.
In addition, in the case of interior panels that are coated with paint, there is a risk that the paint will come off due to aged deterioration of the painted surface, cleaning of the painted surface, or the like.
In the case of interior panels to which tiles are attached, there is a risk that the tiles may come off due to deterioration of the adhesive over time.

In the protective structure (2), since the wall surface is directly coated, it is inexpensive and has good workability.
However, there is a risk that the coating may peel off due to water leakage from concrete, aged deterioration of the coated surface, cleaning of the coated surface, or the like.

In the protective structure of (3), similarly to the interior panel with tiles of (1), the tiles have high resistance to washing and can maintain the reflectance for a long period of time.
However, like the interior panel with tiles in (1), the tiles may come off.
In this protective structure, in addition to the deterioration of the adhesive over time, since it is attached directly to the wall, water leakage from the wall, the difference in elongation rate due to the temperature difference between the tile (pottery) and the concrete wall, and the vibration caused by passing vehicles etc., are major factors.

For this reason, there is a demand for a protective structure that can maintain the function of protecting the walls of concrete structures over a long period of time.

In order to solve the above-mentioned problems, the protective structure according to claim 1 has a permeable and non-combustible permeable layer laminated on the surface of the finishing material attached to the wall surface of the concrete structure. In addition, a net-like body is laminated so as to be interposed in the permeable layer, and the permeable layer is characterized by being hardened while impregnating the net-like body with a liquid agent having permeability, noncombustibility and curing properties. and

In addition, the construction direction of the wall surface according to claim 2 includes an undercoating step of applying a permeable, nonflammable, and hardening liquid agent to the surface of the finishing material attached to the wall surface of the concrete structure; and a top coating step of applying the liquid agent used in the undercoat layer to the surface of the undercoat layer so as to cover the net member, and a step of curing the liquid agent by drying. characterized by comprising

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows the protective structure of embodiment which concerns on this invention, (a) is a front view, (b) is the (b)-(b) sectional view taken on the line of (a). (a) to (c) are process diagrams showing a construction method according to an embodiment of the present invention.

A protective structure A according to an embodiment of the present invention will now be described with reference to FIG.
The following drawings were created for the purpose of explanation, and for the sake of clarity, there are cases where members not required for the explanation are intentionally omitted.
Also, there are cases in which members are intentionally shown large or small for the sake of explanation, and the drawings are not drawn to scale.
In the following description, the same reference numerals in different figures denote portions having the same function, and duplication of description in each figure will be omitted as appropriate.

[Basic configuration of protective structure A]
The protective structure A of the present embodiment is used for the wall surface 10 of a tunnel (concrete structure) 1 of a road. It is applied to make the driver recognize the position of the wall surface 10 .
The protective structure A consists of a protective structure A that repairs the existing tiles (finishing material) T that have already been applied to the wall surface 10 of the tunnel 1, and a protective structure A that is constructed by applying new tiles T to the wall surface 10. including any of

As shown in FIG. 1, the protective structure A is used for wall interior decoration in which a plurality of tiles T are attached to the wall surface 10 of a tunnel 1, and the transmission layer 2 is laminated on the surface T1 of the tiles T. , the mesh-like body 3 is laminated so as to be interposed in the transmission layer 2 .
In such a protective structure A, the surface T1 of the tile T can be visually recognized from the outside through the transparent layer 2, so that cracks and swelling of the surface T1 of the tile T can be visually recognized.
The tiles T are adhered to the surface of the wall surface 10 with an adhesive and held by the transmission layer 2 and the mesh 3 .

[Structure of transparent layer 2]
As described above, the transmission layer 2 has transparency to the extent that the surface T1 of the tile T and cracks and expansion of the surface T1 can be visually recognized.
Here, the transparency means the property of having a transmittance to the extent that at least the surface T1 of the tile T can be visually recognized from the outside of the transparent layer 2. As long as it has such properties, it may be colorless transparent, colored transparent, Either translucent is acceptable.
When the protective structure A is used for the interior of the wall surface 10 of the tunnel 1 as in the present embodiment, it is necessary to reflect the headlights of the automobile on the tiles T so that the driver can recognize the position of the wall surface 10. .
Therefore, in order to allow the light of the headlight to reach the surface T1 of the tile T efficiently so as not to hinder the reflection of the surface T1 of the tile T, and to ensure that the driver recognizes the light reflected by the surface T1 of the tile T. , Colorless and transparent are suitable.

The permeable layer 2 is formed by applying a liquid agent containing a silane coupling agent to the surface T1 of the tile T and hardening it, and by hardening it firmly adheres to the surface T1.
Further, in the permeable layer 2 is interposed a net-like body 3 held by curing a liquid agent containing a silane coupling agent.

As the liquid agent containing the silane coupling agent, a viscous liquid that is nonflammable and permeable and has the property of curing when exposed to air is preferable.
The viscous liquid preferably has a viscosity that does not easily drip when applied.
Further, the liquid agent containing the silane coupling agent preferably has the property of having a fast curing time, and more preferably one that reaches pencil hardness in about 3 hours.
An example of such a liquid agent is the trade name "TS Bond 40S (certified noncombustible by the Ministry of Land, Infrastructure, Transport and Tourism (certification number NM-4970))" manufactured and sold by the applicant.
In addition, the material constituting the permeable layer 2 is not limited to a liquid agent containing a silane coupling agent (for example, TS Bond 40S). It is sufficient if it has

[Configuration of mesh-like body 3]
The net-like body 3 is formed in a net-like shape by weaving warp yarns 3A and weft yarns 3B, which are made by bundling a large number of thin, transparent, nonflammable glass fibers.
The refractive index of the glass fibers used for the warp yarns 3A and the weft yarns 3B is preferably equal to the refractive index of the transparent layer 2 in which the liquid agent is cured.
By setting the refractive index of the transmission layer 2 in which the glass fiber and the liquid agent used for the warp 3A and the weft 3B to be the same or approximate values, the warp 3A and the weft 3B stacked in the transmission layer 2 are not visible, Moreover, it is possible to prevent irregular reflection by the warp yarns 3A and the weft yarns 3B.
As a result, the light reflected by the surface T1 of the tile T can be safely and reliably recognized by the driver.
The difference in refractive index between the above glass fiber and the transmission layer 2 is preferably about 0 to 0.5 n. Within this range, even if the difference in refraction is the maximum value, the warp 3A will be visible from the driver while driving. and the weft 3B are difficult to see, and the influence of diffused reflection on the driver is considered to be extremely small.
In addition, a more preferable refractive index difference is in the range of 0 to 0.3n, and within this range, even when the difference in refraction is the maximum value, the warp 3A and weft 3B are not visible, and irregular reflection is not observed. You can almost certainly prevent it.

As shown in FIG. 1, in such a net-like body 3, a liquid agent containing a silane coupling agent penetrates a mesh 3C formed between the warp yarns 3A and the weft yarns 3B and surrounds the warp yarns 3A and the weft yarns 3B. By impregnating and curing as described above, the mesh-like body 3 is firmly held in the permeable layer 2 .
The net-like body 3 may be of a fixed shape formed to have a certain size (area), or may be formed to be long in the warp or weft direction.
The glass fibers forming the warp yarns 3A and the weft yarns 3B preferably have high tensile strength.
Also, the warp 3A and the weft 3B may be made of various fibers having high tensile strength (eg, metal wire) other than glass fiber, or may be made of a single filament (eg, metal wire).
The mesh-like body 3 is not limited to one formed by weaving the warp yarns 3A and the weft yarns 3B.
The size of the mesh 3C is preferably large enough to allow the state of the surface T1 of the tile T to be visually recognized and to prevent cracks and expansion of the surface T1 of the tile T.

According to such a protective structure A, the permeable layer 2 and the net-like body 3 are laminated on the surface T1 of the tile T, thereby reinforcing the wall surface 10 of the tunnel 1 and the tile T and holding the tile T. .
In addition, the state of cracks, expansion, etc. of the surface T1 of the tile T can be visually recognized through the transparent layer 2, and fragments of the tile T about to fall off the wall surface 10 of the tunnel 1 are held by the transparent layer 2 and the net-like body 3. You can prevent it from falling.
Moreover, even if a fire occurs in the tunnel 1 due to an automobile accident, the flame does not spread to the nonflammable permeable layer 2 and the net-like body 3, so that fire damage can be suppressed.
Therefore, it is possible to provide the protective structure A that can maintain the function of protecting the wall surface 10 of the tunnel 1 for a long period of time.

Next, a construction method for the protective structure A will be described with reference to FIGS. 2(a) to 2(c).
This construction method consists of repairing the existing tiles (finishing material) T already attached to the surface of the wall surface 10 of the tunnel 1 to construct the protective structure A, and attaching new tiles T to the surface of the wall surface 10. It can be applied to the method of constructing the protective structure A composed of

Undercoating (first) step (FIG. 2(a)): A liquid agent (using TS Bond 40S) containing a silane coupling agent 4 is applied to the surface T1 of the tile T attached to the surface of the wall surface 10 using a roller, brush, or the like. Alternatively, the liquid agent 4 containing the silane coupling agent is sprayed onto the surface T1 by an injection nozzle, and the undercoat layer 20A is formed by using a roller, a brush, or the like for finishing.
In this undercoating step, it is preferable to function as a primer for smoothing the surface of the undercoat layer 20A by removing irregularities and the like from the surface T1 of the tile T.

Mesh-like body application (second) step (FIG. 4(b)): Before the undercoat layer 20A dries and hardens, the mesh-like body 3 is applied to the surface of the undercoat layer 20A.
At this time, the net-like body 3 is adhered so as not to be bent or wrinkled. However, since the surface of the undercoat layer 20A is smoothed by the above-described undercoating step, the net-like body 3 can be easily adhered. ing.

Overcoating (third) step (FIG. 4(c)): Before the undercoat layer 20A dries and hardens, the liquid agent 4 used in the undercoat is applied to the surface of the undercoat layer 20A using a roller, brush, or the like. Then, the liquid agent 4 is sprayed onto the surface of the undercoat layer 20A by an injection nozzle, and the topcoat layer 20B is formed by coating with a roller, brush, or the like.
In this topcoating step, the coating is applied so as to cover the net-like body 3 adhered in the net-like body applying step, and the coating is applied so as to ensure the adherence of the net-like body 3 to the surface of the undercoat layer 20A.
Then, by curing the undercoat layer 20A and the topcoat layer 20B in a laminated state, the transmission layer 2 is formed by integrating the topcoat layer 20B with the undercoat layer 20A.

It is also conceivable to carry out the overcoating step and the above-described mesh-like body adhering step substantially at the same time.
Specifically, when the net-like body 3 is applied to the undercoat layer 20A, the net-like body 3 is overcoated while being pressed against the undercoat layer 20A with a roller, a brush, or the like impregnated with a liquid agent 4 containing a silane coupling agent. Thus, the top coating can be performed while the net-like body 3 is being adhered.

From the above-described adhering step to the overcoating step, the liquid agent 4 containing the silane coupling agent gradually hardens while impregnating the adhered network body 3, thereby forming a topcoat layer 20B and an undercoat layer 20B as shown in FIG. The transparent layer 2 is formed by integrating the layer 20A with the mesh-like body 3 interposed therebetween.
The thickness of the transmission layer 2 is set so that the mesh-like body 3 laminated in the transmission layer 2 does not protrude from the surface of the transmission layer 2 so that the surface of the transmission layer 2 does not become uneven.

By such a construction method, the surface T1 of the tiles T attached to the wall surface 10 of the tunnel 1 can be visualized, and the tiles T can be prevented from falling off, and a noncombustible protective structure A can be constructed.
Therefore, it is possible to construct the protective structure A that can maintain the function of protecting the wall surface 10 of the tunnel 1 for a long period of time.
In addition, since the hardening time of the liquid agent 4 is fast, the protective structure A can be constructed in a short construction period (completed in about 3 hours), and as a result, vehicle regulations can be shortened and the overall cost reduction effect is high.

The construction method of the protective structure A and the protective structure A described above is not limited to the construction method of the protective structure A and the protective structure A on the wall surface 10 of the tunnel 1, but also the protective structure and protection of the outer wall of the concrete building (concrete structure). It can also be applied to construction methods of construction (not shown).
In the case of a protective structure for the outer wall of a concrete building, it may be colored and transparent by mixing a coloring agent matching the color of the tile T, or it may be colorless and transparent so that the tile T can be seen through.
Moreover, the finishing material is not limited to the tile T.

As described above, the protective structure A for the wall surface of the concrete structure and the method for constructing the protective structure A for the wall surface of the concrete structure according to the present invention have been described in detail with reference to the drawings. The invention is not limited to this, and even if there is a change in design within the scope of the gist of the invention, it is included in the invention.
In addition, each embodiment can be combined by diverting each other's techniques as long as there is no particular contradiction or problem in its purpose, configuration, or the like.

A: Protective structure T: Tile (finishing material)
T1: Surface 1: Tunnel (concrete structure)
10: wall surface 2: transmission layer 3: network 4: liquid agent 20A: undercoat layer

Claims (2)

A permeable and non-combustible permeable layer is laminated on the surface of the finishing material attached to the wall surface of the concrete structure, and a net-like body is laminated so as to be interposed in the permeable layer. A protective structure characterized in that the layer is formed by hardening a liquid agent having permeability, noncombustibility, and hardening properties in a state in which the net-like body is impregnated. An undercoating step of applying a permeable, non-combustible, and hardening liquid agent to the surface of the finishing material attached to the wall surface of the concrete structure, and a coating step of coating the net-like body on the surface of the undercoating layer; A method for constructing a protective structure, comprising: a top coating step in which the liquid agent used in the undercoating step is superimposed on the surface of the undercoat layer and applied so as to cover the net-like body; and a step in which the liquid agent is cured by drying.

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