JP2004084348A - Form member for covering existing structure and covering method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a form panel for coating an existing structure and a coating method for the existing structure coating method capable of easily carrying out repair of the surface part of the existing structure by a laminated sheet, maintenance and repair of the external appearance or the like with high degree of accuracy. <P>SOLUTION: The form panel 1 for the existing structure coating is so constituted that a projection 11a consisting of an attachment or a transplantation type fibrous material, a mesh of knitting fabric and a mineral particle or a synthetic resin particle is provided to the inside and that the outside of the laminated sheet 1a consisting of a resin layer 11 fixed to the existing structure in a state to closely fill the circumference of the projection 11a with a hardener (without being illustrated) and a coating layer 12 having one or more layers fixed to the outside of the resin layer 11 through an adhesive and having the outermost layer with a stain-proof function is stuck on the inside of the usual form panel 1b in a detachable manner. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a form member for covering an existing structure and a method for covering an existing structure, which are mainly used for repairing, maintaining, and restoring the appearance of a surface portion of an existing concrete structure.
[0002]
[Prior art]
In the existing concrete structure, over a long period of time after construction, structural degradation such as alkali-aggregate reaction, chemical corrosion including neutralization, salt damage, etc. due to various factors, acid rain, soot and soot Due to environmental and biological factors such as moss, deterioration in appearance is also observed. Measures such as cleaning and repainting may be adopted for such structural deterioration and appearance deterioration of existing concrete structures, but none of these measures were permanent. .
[0003]
As a permanent technical means, conventionally, a base cloth made of a fiber base which should be bonded to a structure via a mortar as a solidifying material, and a base cloth bonded to the outside of the base cloth with an adhesive. There was a laminated sheet for coating existing structures consisting of a coating layer containing fluorine, but the inside of the base fabric was not saturated with mortar during bonding, and an air layer remained inside the base fabric, so after the start of service There was a problem that the laminated sheet was easily peeled off from the structure.
[0004]
Therefore, as a technical means capable of preventing deterioration of a structure for a long time after coating and maintaining its appearance, there is a laminated sheet for coating an existing structure invented by the present inventors.
[0005]
This is provided with protrusions made of a fur or flocked fibrous material, a mesh-like knitted fabric, mineral particles or synthetic resin particles on the inner side, and the solidified material is filled around the protrusions without gaps. The resin layer is fixed to the structure in a state, and one or more coating layers are fixed to the outside of the resin layer via an adhesive, and the outermost layer has a stain preventing function.
[0006]
[Problems to be solved by the invention]
However, such a laminated sheet for covering an existing structure is made of a soft and freely deformable sheet member unlike a member having rigidity such as a tile, and therefore, has sufficient flatness on the outer surface of the coating layer. May be difficult to secure.
[0007]
In addition, in order to ensure sufficient flatness on the outer surface of the coating layer, it is premised that sufficient flatness is ensured on the outer surface of the solidified material. Required. However, recently, there is a shortage of skilled workers capable of realizing such plastering work, and a rise in construction costs is inevitable.
[0008]
Therefore, an object of the present invention is to easily and highly repair, maintain, and repair the appearance of the surface of a structure with a laminated sheet so that the flatness on the outer surface of the coating layer and the effect of reducing the construction cost can be sufficiently obtained. An object of the present invention is to provide a form member for covering an existing structure and a method for covering an existing structure, which can be performed with high accuracy.
[0009]
[Means for Solving the Problems]
That is, the present invention is configured to include the first invention and the second invention. The first invention relates to a formwork member for covering an existing structure, and the second invention relates to a method for covering an existing structure.
[0010]
The formwork member for covering an existing structure according to the first invention is applied when the existing structure is covered for the purpose of repairing, maintaining, and restoring the appearance of a surface portion of the existing structure.
[0011]
This is because a resin layer is fixed to an existing structure in a state in which a protrusion is provided on the inner side and a solidifying material is filled around the protrusion without a gap, and a resin layer is fixed to the outside of the resin layer via an adhesive. The outer surface of a laminated sheet comprising an outermost layer and one or more coating layers having a stain-preventing function is removably attached to the inner surface of a weir.
[0012]
According to such a form member for covering an existing structure according to the first aspect of the invention, a structural feature in which the outer surface of the soft and deformable laminated sheet is detachably attached to the inner surface of the dam plate. Therefore, it is possible to easily and highly accurately repair, maintain, and repair the appearance of the surface portion of the existing structure using the laminated sheet.
[0013]
Therefore, according to this, it is possible to sufficiently obtain the flatness on the outer surface of the coating layer and the effect of reducing the construction cost.
[0014]
On the other hand, the existing structure coating method according to the second invention is a method applied when coating the existing structure for the purpose of repairing, maintaining, and restoring the appearance of the surface portion of the existing structure.
[0015]
This is configured as a method including the following steps.
[0016]
In other words, the mold member for covering the existing structure according to claim 1 is arranged with a gap from the surface of the existing structure, with the side to which the laminated sheet is attached facing the existing structure. Formwork member arrangement step.
[0017]
Then, a solidification material filling step of filling the gap with the solidification material after the mold member arrangement step.
[0018]
According to such an existing structure covering method according to the second invention, a formwork is performed using a formwork panel in which an outer surface of a soft and freely deformable laminated sheet is detachably attached to an inner surface of a dam board. Since it is configured so as to include the solidifying material filling step after the member arranging step, it is possible to easily and accurately repair and maintain the surface portion of the existing structure with the laminated sheet and restore the appearance.
[0019]
Therefore, according to this, it is possible to sufficiently obtain the flatness on the outer surface of the coating layer and the effect of reducing the construction cost.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0021]
[Form member 1 for covering existing structure]
FIG. 1 is a cross-sectional view illustrating a configuration of a form member for covering an existing structure according to an embodiment of the present invention, and FIG. 2 is an external configuration of a structure to which the form member for covering an existing structure is applied. FIG.
[0022]
In the present embodiment, the formwork member 1 for covering an existing structure is provided for the purpose of repairing, maintaining, and repairing the surface of an existing concrete structure 31 (see FIGS. 3 to 6) as a subway station. This is applied when the concrete structure 31 is covered.
[0023]
More specifically, as shown in FIG. 1, this formwork member 1 for covering an existing structure is formed by attaching the outer surface of a laminated sheet 1a for covering an existing structure to the inner surface of a weir board 1b. And a laminated sheet 1a for covering an existing structure and a weir board 1b.
[0024]
Hereinafter, each of these components will be described in more detail.
[0025]
<Laminated sheet 1a for covering existing structure>
In the present embodiment, the laminated sheet 1a for covering the existing concrete structure is applied to the covering of the existing concrete structure 31 for the purpose of repairing, maintaining, and restoring the appearance of the surface portion of the existing concrete structure 31. .
[0026]
More specifically, the laminated sheet 1a for covering an existing structure includes a resin layer 11 and a coating layer 12.
[0027]
Hereinafter, each of these components will be described in more detail.
[0028]
(1) Resin layer 11
The resin layer 11 is configured to include a synthetic resin sheet and a projection 11a made of a flocked fiber material provided inside the synthetic resin sheet.
In addition, the resin layer 11 is not limited to the one including the protrusions 11a made of a flocked fiber material, the protrusions made of a hair-like fiber material, the protrusions made of a mesh-like knitted fabric, and the minerals. Particles or projections made of synthetic resin particles may be included.
[0029]
The resin layer 11 plays a role of being fixed to the existing concrete structure 31 in a state where the concrete 25 as a solidifying material is filled around the protrusions 11a made of a flocked fiber material without gaps. It is configured as
[0030]
More specifically, the protrusions 11a made of a flocked fiber material are formed by planting a flocked material made of a synthetic resin on a synthetic resin sheet described later. Further, the protrusions 11a made of the flocking fiber material are preferably rod-shaped monofilament fiber materials, and are roughly and uniformly planted in a sheet shape so as not to hinder the flow of the concrete 25 immediately after the concrete 25 is cast. Is preferred.
[0031]
Here, the protrusions 11a made of the flocking fiber material in the resin layer 11 may be of any material. However, the protrusions 11a made of at least one of synthetic fibers, inorganic fibers, and metal fibers may be used. By appropriately arranging the protrusions 11a made of a fibrous fiber material as structural members in the concrete 25, an effect that can be expected to positively obtain not only the maintenance of the existing concrete structure 31 but also the reinforcement is secured. .
[0032]
In addition, from the viewpoint of obtaining a sufficient fixing effect between the laminated sheet 1 and the concrete 25 by making the projections 11a made of such a flocking fiber material completely bite into the concrete 25, It is preferable that at least the end of the flocking fiber material has an arrowhead shape or a hook shape.
[0033]
The same effect can be obtained for protrusions made of a hair-like fiber material and a protrusion made of a net-like knitted fabric, which will be described later.
[0034]
In other words, such a resin layer 11 has a void large enough to be filled with the concrete 25, so that after the concrete 25 is solidified, a sufficient fixing effect between the laminated sheet 1 and the concrete 25 is obtained. Can be In addition, since the operation of these voids can be performed by increasing or decreasing the amount of the raw material and increasing or decreasing the heating compression force, the resin layer 11 having the appropriate size of the voids can be obtained according to the performance of the concrete 25 such as fluidity.
[0035]
By the way, when a cement-based material such as mortar is used as the solidifying material, it is necessary to consider the influence of the alkalinity of the cement-based material on the protrusions. For example, in the case where a projection provided with synthetic resin particles is used, it is preferable to select an alkali-resistant projection, such as a polyethylene resin, an olefin resin such as a polypropylene resin, and ethylene / propylene.・ Polypropylene resin, vinyl acetate copolymer resin, urea resin, polyamide resin, vinyl acetate resin, vinyl chloride resin, etc. containing synthetic rubber components such as mixed resin composed of copolymer and polypropylene resin are suitable. It becomes. On the other hand, when employing those provided with protrusions composed of mineral particles, a single particle of a natural mineral having alkali resistance, for example, crushed concrete, crushed brick, recycled artificial mineral such as crushed tile, etc. Alternatively, mixed particles are suitable materials.
[0036]
On the other hand, the synthetic resin sheet 12 is configured to be fixed to the outside of the resin layer 11. In this case, a synthetic resin, which is a plastic polymer compound widely used in civil engineering / building materials, electric parts, industrial materials, and the like, is employed.
[0037]
Therefore, this synthetic resin sheet 12 can be obtained from any existing synthetic resin sheet, is easy to mold and process, is light, and has excellent water resistance, oil resistance, and chemical resistance. It can be used as transparent or colored.
[0038]
Specifically, such a synthetic resin has alkali resistance, and is softened once by heating, and then softened by forming a crosslinked (network) structure by a chemical reaction, but does not soften when heated again. Thermosetting resins that produce relatively low molecular weight resins with monomers with three or more functionalities, such as phenolic resins, urea resins, melamine resins, epoxy resins, and silicon resins. It is a bifunctional or more functional monomer such as polyethylene, polypropylene, polystyrene, ABS resin, vinyl chloride resin, nylon, fluororesin, and polycarbonate, which has the property of solidifying. is there.
[0039]
On the other hand, such a synthetic resin sheet 12 is configured so as to represent the design 14 on the outer surface.
[0040]
In other words, according to such a synthetic resin sheet 12, it is possible to externally express the design 14, such as characters, figures, patterns, and colors, having a large aesthetic effect, and to further enhance the external appearance of the existing concrete structure 31. It is possible to increase.
[0041]
As such a design 14, for example, by coloring a thermoplastic resin, continuously squeezing from a gap between the rolls and forming a pattern on a roll surface of a calendering machine for forming a sheet shape, the color shape is formed. It can be formed, or a sheet made of a synthetic resin of a thermoplastic resin is sandwiched between high-frequency electrodes, a high-frequency voltage is applied to heat the sheet, and the sheet is pressed and molded into an arbitrary shape by heat fusion. You can also.
[0042]
According to such a resin layer 11, since the thread spacing or the spacing between the linear and thread-like objects is considerably wide and the texture is coarse in the protrusions 11a made of the flocking fiber material, the mortar is used in addition to concrete. It is sufficiently possible to saturate with concrete 25 such as.
[0043]
That is, according to such a resin layer 11, since the portion to be bonded by the concrete 25 is configured to include the protrusion 11a made of such a flocked fiber material, the concrete 25 is securely and securely bonded by the concrete 25 at the time of bonding. As a result, the air layer does not remain inside even after the covering of the existing concrete structure 31 is completed.
[0044]
Therefore, the water vapor or gas moves along the interface between the existing concrete structure 31 and the laminated sheet 1, the water vapor or gas generated from the existing concrete structure 31 expands the vicinity of the air layer, or the existing concrete structure 31 Due to an inherent difference in the coefficient of linear thermal expansion between the laminated sheet 1 and the laminated sheet 1, there is no possibility that the laminated sheet 1 is peeled off from the existing concrete structure 31.
[0045]
Therefore, according to this, it is possible to prevent the existing concrete structure 31 from deteriorating and maintain its appearance for a long period of time after coating, and the effect of maintaining and improving the appearance of the existing concrete structure 31 is one. It is possible to obtain a reliable and sufficient result by performing the work a number of times.
[0046]
(2) Coating layer 12
The coating layer 12 plays a role of being fixed to the outside of the synthetic resin sheet 12 via an adhesive.
[0047]
The outermost layer of the coating layer 12 in the present embodiment is configured to carry a photocatalyst.
[0048]
More specifically, although not shown, the coating layer 12 is composed of a fluorine-based resin layer 11 formed on the outside and a photocatalyst layer formed on the inside, and the photocatalyst layer is synthesized via an adhesive. It is fixed to the outside of the resin sheet 12.
[0049]
In other words, according to such a coating layer 12, it is possible to eliminate the periodic cleaning work due to the effects of the antifouling, antibacterial, and antifungal properties of the photocatalyst. It is possible to reduce the burden.
[0050]
Here, the photocatalyst contained in the photocatalyst layer comprises a composite of at least one of a metal oxide gel and a metal hydroxide gel and photocatalyst particles.
[0051]
The layer portion made of the adhesive is made of at least one resin selected from the group consisting of a silicon-modified resin that is an acrylic-silicon resin, a silicon-modified resin containing polysiloxane, a silicon-modified resin containing colloidal silica, and an acrylic-fluorine resin. Has become.
[0052]
<Weir board 1b>
The weir board 1b generally refers to a plywood made by thinning wood or the like into a single veneer with the fiber direction orthogonal and laminating an odd number of pieces with an adhesive, or a plate material such as a metal foam or the like dedicated to a formwork. The weir board 1b in the present invention is not limited to this, and any board that can exhibit rigidity as a mold, easy handling, etc., such as particle board, fiber board, foamed synthetic resin, Any combination of these may be appropriately selected.
[0053]
Examples of such a weir plate 1b include, for example, those mainly using lauans, and those using bobbin snakes, domestically-produced narayana, bunches, birches, and the like.
[0054]
The adhesive used for attaching the laminated sheet 1a to the dam 1b may be appropriately selected as long as the adhesive property can be secured.
[0055]
That is, the formwork member 1 for covering the existing structure in the present embodiment is provided with the protrusions 11a made of a flocked fiber material on the inner side, and the concrete 25 is filled around the protrusions without gaps. A resin layer 11 fixed to the existing concrete structure 31 in a state, and one or more coating layers which are fixed to the outside of the resin layer 11 via an adhesive and whose outermost layer has a stain preventing function. The outer surface of the laminated sheet is detachably attached to the inner surface of the weir plate 1b.
[0056]
According to such a form member 1 for covering an existing structure, there is a structural feature in which the outer surface of the soft and freely deformable laminated sheet 1a is removably attached to the inner surface of the dam 1b. As a result, the flatness of the outer surface of the coating layer 12 is sufficiently ensured, and the repair, maintenance, and appearance restoration of the surface portion of the existing concrete structure 31 by the laminated sheet 1a can be easily and easily performed. It is possible to perform with accuracy.
[0057]
[Existing structure coating method]
3 to 6 are cross-sectional views illustrating a method for covering an existing structure according to an embodiment of the present invention.
[0058]
In the present embodiment, the existing structure coating method is performed using the form member 1 for coating the existing structure as described above, and is configured by steps from a form member arrangement step to a concrete filling step. Have been. Hereinafter, each step will be described with reference to these drawings.
[0059]
(1) Form Member Arranging Step First, the following preparatory work as a prerequisite is performed.
[0060]
That is, the laminated sheet 1a and the weir board 1b for covering the existing structure are manufactured in advance in the factory, and are carried into the site, and the outer surface of the carried laminated sheet 1a is formed by the molding member 1 for covering the existing structure. The formwork member 1 for covering the existing structure is processed on site by a method of detachably attaching to the inner surface.
[0061]
At this time, since these materials are all lightweight, quickness and easiness in transportation and handling operations are ensured. In addition, since the soft and freely deformable laminated sheet 1a is attached to the inner surface of the existing structure covering form member 1 having sufficient flatness, the flatness on the outer surface of the laminated sheet 1a is improved. Sufficiently secured.
[0062]
On the other hand, floating and dirt on the surface of the existing concrete structure 31 are removed by high-pressure washing using a water jet. Then, although not shown, a half cracked pipe for guiding water leakage from the cracked portion to the drainage groove below is appropriately added to the surface of the existing concrete structure 31.
[0063]
At this time, although not shown, if the surface of the existing concrete structure 31 is roughened by chipping, or if the anchor rebar is removed from the reinforcing bars included in the existing concrete structure 31, not only the structure but also the appearance can be obtained. Be effective.
[0064]
The high-pressure washing operation and the attachment operation of the half-broken pipe sufficiently prevent the existing concrete structure 31 from deteriorating for a long period of time after coating and maintain the appearance of the laminated sheet 1a for covering the existing structure. To secure. In other words, by performing such a work, it is ensured that the maintenance effect and the appearance improvement effect of the existing concrete structure 31 can be reliably and sufficiently obtained by one construction.
[0065]
In the state where such preparation work is completed, the following form member arranging process is performed.
[0066]
That is, with a gap from the surface of the existing concrete structure 31, the formwork member 1 for covering the existing structure is arranged with the side where the laminated sheet 1a is stuck facing the existing concrete structure 31 side. Then, it is fixed by the anchor 21.
[0067]
Specifically, after securing a working scaffold (not shown) in advance, the formwork member 1 for covering the existing structure is provided with a predetermined gap from the surface of the existing concrete structure 31 in accordance with the planned layout diagram. At the same time, the arranged form member 1 for covering the existing structure is fastened and fixed using the anchor 21, the flap 22, the foam tie 23, and the round separator 24 previously placed on the existing concrete structure 31. At the same time, a form support (not shown) is constructed as necessary (see FIGS. 3 to 5).
[0068]
At this time, since these materials are all lightweight, quickness and easiness in the work of arranging and fixing the formwork member 1 for covering the existing structure are ensured. In addition, through the work of fixing the formwork member 1 for covering the existing structure, a sufficient flatness on the inner surface of the formwork member 1 for covering the existing structure is ensured. Flatness is sufficiently ensured.
[0069]
Then, when the mold member 1 for covering the existing structure is tightened and fixed over the entire planned layout area, the mold member arrangement step is completed.
[0070]
(2) Concrete filling process First, the following preparatory work as a precondition is performed.
[0071]
That is, whether the condition of the formwork member 1 and the anchor reinforcing bar (not shown) for covering the existing structure can sufficiently withstand the casting of the concrete 25, which is the concrete 25, and the like are checked. The inner surface of the mold member 1, that is, the protrusions 11 a made of a flocked fiber material contained in the resin layer 11 are wetted with water to improve the adaptability of the concrete 25.
[0072]
In the state where such preparation work has been completed, the following concrete filling step is performed.
[0073]
That is, in the concrete filling step, after the form member arranging step, concrete 25 is filled into the surface of the existing concrete structure 31 and the gap between the form members 1 for covering the existing structure.
Specifically, the concrete 25 transported by the transport vehicle is driven into the surface of the existing concrete structure 31 and the gap between the formwork members 1 for covering the existing structure by a concrete pump (not shown) to be filled. (See FIG. 5).
[0074]
Here, the concrete 25 is driven while the surface of the predetermined working section is made to be substantially horizontal for each section, and is continuously driven until the filling is completed.
[0075]
At this time, when the concrete 25 is driven, the material is prevented from being separated as much as possible by compaction by an internal vibrator or a form vibrator. It becomes possible to fill up variously.
[0076]
In particular, if the form vibrator is used effectively, the paste component in the concrete 25 emerges and gathers near the form member 1 for covering the existing structure, and as a result, the flocking of the resin layer 11 is formed. The protrusions 11a made of a fiber material are sufficiently saturated, and a situation in which an air layer remains inside after the covering of the existing concrete structure 31 is completed is effectively avoided.
[0077]
Further, the flatness on the outer surface of the laminated sheet 1a can be sufficiently ensured only by throwing the concrete 25 into the gap between the surface of the pre-fixed formwork member 1 for covering the existing structure and the existing concrete structure 31. As expected, this ensures the speed and ease of this concrete filling process.
[0078]
In addition, as an alternative material of the concrete 25, for example, mortar, epoxy resin, or the like can be cast. However, in the case of mortar, from the viewpoint of preventing the deterioration of the existing concrete structure 31 for a long time after coating and securing the effect of the laminated sheet 1a for coating the existing structure, which maintains the appearance, non-shrink mortar is used. It is preferable to cast.
[0079]
Then, the concrete 25 is filled over the entire gap region on the surface of the existing structure covering form member 1 and the existing concrete structure 31, and when the demolding is completed after the curing period has elapsed, this concrete is removed. When the filling step is completed, the existing structure covering method is completed (see FIG. 6).
[0080]
That is, according to such an existing structure covering method, the form member 1 for covering the existing structure is formed by removably attaching the outer surface of the soft and freely deformable laminated sheet 1a to the inner surface of the dam plate 1b. After the form member arranging step is performed by using the method, the concrete sheet filling step is included, so that the flatness on the outer surface of the coating layer 12 and the effect of reducing the construction cost are sufficiently ensured while the laminated sheet 1a is formed. It is possible to easily and highly accurately repair, maintain, and repair the appearance of the surface portion of the existing concrete structure 31 by the method described above.
[0081]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the formwork member for covering existing structures and the method for covering existing structures according to the present invention, the flatness on the outer surface of the coating layer and the effect of reducing the construction cost can be sufficiently obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a form member for covering an existing structure according to an embodiment of the present invention.
FIG. 2 is a front view showing an external configuration of a structure to which a form member for covering an existing structure according to an embodiment of the present invention is applied.
FIG. 3 is a sectional view (part 1) for explaining a method for covering an existing structure according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view (part 2) illustrating a method for covering an existing structure according to an embodiment of the present invention.
FIG. 5 is a sectional view (part 3) for explaining the method for covering an existing structure according to one embodiment of the present invention;
FIG. 6 is a sectional view (part 4) for explaining the existing structure covering method according to one embodiment of the present invention;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Form member 1a for covering existing structures 1a Laminated sheet 1b Weir board 11 Fiber layer 11a Projection 12 made of flocking fiber material 12 Sheet layer 13 Coating layer 14 Design 21 Anchor 22 Butter material 23 Form tie 24 Round separator 25 Concrete 31 Existing concrete structures

Claims (2)

A protrusion is provided on the inner side, and a resin layer fixed to the structure in a state in which the solidifying material is filled around the protrusion without a gap, and a resin layer fixed to the outside of the resin layer via an adhesive. Yes, the outer surface of the laminated sheet composed of one or more coating layers having a stain prevention function,
Characterized in that it is detachably attached to the inner surface of the weir board,
Formwork member for covering existing structures. A formwork for disposing the formwork member for covering an existing structure according to claim 1 with a gap from the surface of the existing structure, with the side to which the laminated sheet is attached facing the existing structure. A member arrangement process,
After the mold member disposing step, a solidifying material filling step of filling the gap with a solidifying material,
Existing structure coating method.

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