JP4890522B2 - Repair method of concrete structure using photo-curable fiber reinforced resin sheet - Google Patents

Description

  According to the present invention, a photocurable fiber reinforced resin sheet (hereinafter sometimes referred to as a photocurable FRP sheet) in which a continuous fiber is reinforced and cured by a photocurable resin that cures and adheres when receiving ultraviolet rays is used as a concrete structure. It belongs to the technical field of a method of repairing and reinforcing the concrete structure by applying it to the surface of the place where repair of the object is necessary, making it adhere, curing by ultraviolet irradiation and bonding.

  Conventionally, for concrete structures such as tunnels, durable inner-wrapped concrete has been applied to the secondary lining for the purpose of reinforcing and waterproofing the primary lining and finishing the interior. However, in concrete structures, as a problem in construction, so-called junkers where cement and aggregates are not sufficiently kneaded or separated, or so-called cold joints of joints, etc., are generated as defective parts, and cracks are generated or peeled off. Serious problems that have caused the fall have been revealed. The accident of peeling and falling is a problem of the useful life of the concrete structure itself, and at the same time, it causes danger and damage to passers-by and passers-by vehicles, so safety measures are an important issue.

  Patent Document 1 discloses a method for reinforcing a concrete as a secondary lining of a tunnel by adhering a photo-curable FRP sheet that cures and adheres to ultraviolet light to a concrete wall surface after the primary lining. . In order to increase the adhesive strength between the photocurable FRP sheet and the concrete, the concrete surface after the primary lining is smoothed and a primer agent is applied. After that, in order to bond the photo-curable FRP sheet to the concrete surface, the photo-curable FRP sheet is applied along the axial direction of the tunnel using the bonding work device conveyed to the inside of the tunnel, and sequentially downward from the top end. It is described that after pressure is applied, ultraviolet rays are irradiated using an ultraviolet irradiation device to cure and adhere.

The photocurable fiber reinforced resin sheets disclosed in Patent Document 2, Patent Document 3, and Patent Document 4 are various substances in a composition composed of a monomer, an oligomer, a photopolymerization initiator, and various additives. For example, it is described that durability, water resistance, productivity, photocurability, and the like have been improved.
JP 2000-136696 A JP 2003-26738 A JP 2003-95706 A JP 2002-60636 A

The reinforcement method of the above-mentioned Patent Document 1 is not only economically necessary for repairing a concrete structure that has been peeled off or cracked, but also needs to be applied to the entire surface of the concrete. There is a lot of work. In addition, since it is necessary to adhere and bond evenly over the entire surface, a dedicated bonding work device is required, which takes a lot of time and labor for the bonding work.
The photo-curing type FRP sheet is applied to the concrete surface in a state of being formed into a thin sheet having a certain degree of hardness. Therefore, even if a pressing roller or the like is used, the surface is rough enough to be soft and flexible. Since it adheres by irradiating with ultraviolet rays without following and adhering, it is likely to be in an adhesion state close to so-called point contact, and the adhesion area is small. Inevitably, the adhesive strength and peel strength are low. As a solution to this problem, a pretreatment for forming a rough concrete surface in a smooth state before bonding, for example, application of a primer agent, or application of a mixed solution of an adhesive resin and a curing agent is performed. It had to be done, was labor intensive and costly and was very inefficient.

  The purpose of the present invention is to increase the adhesive strength and peel strength by irradiating ultraviolet light after applying pressure and vibration to a photocurable FRP sheet applied to the concrete surface, It is providing the repair method of the concrete structure using a photocurable fiber reinforced resin sheet.

  The next object of the present invention is to wrap a part of the light-cured FRP sheet that has been bonded in advance, and to bond the new light-cured FRP sheet by the above-described method. It is an object of the present invention to provide a method for repairing a concrete structure using a photo-curable fiber-reinforced resin sheet that is effective immediately against progress.

As a means for solving the problems of the prior art, a method for repairing a concrete structure using a photocurable fiber-reinforced resin sheet according to the invention described in claim 1,
The photocurable fiber reinforced resin sheet 1 that cures and adheres when exposed to ultraviolet rays is applied to the surface of the concrete structure 3 where repair is necessary, and pressure is applied to the light curable fiber reinforced resin sheet 1 to the concrete surface 10. In the method of adhering and repairing by irradiating with ultraviolet rays,
The photocurable fiber reinforced resin sheet 1 applied to the surface of the concrete structure 3 where repair is required is pressed by the pressing roller 7 to apply the required pressure, and vibration is applied by the vibrator, or the pressing roller is used by the vibrator. 7 is vibrated and pressure and vibration are applied to strongly adhere the sheet 1 to the concrete surface 10, and the sheet 1 is irradiated with ultraviolet rays to be cured and adhered to the concrete surface 10 to be repaired and reinforced. .

In the repair method of a concrete structure using the photocurable fiber-reinforced resin sheet according to the invention described in claim 2,
A new photo-curable fiber reinforced resin sheet that is partially wrapped in a photo-curable fiber reinforced resin sheet 1 that has been bonded to the repair-necessary portion in advance of the peeling of cracks 4 and the progress of cracks 4 in the concrete structure 3 1 'is peeled off the concrete structure 3 and applied to the progressing part of the crack 4, and the new sheet 1' is pressed by the pressing roller 7 to apply the required pressure, and the vibrator is vibrated or pressed by the vibrator. The roller 7 is vibrated to apply pressure and vibration so that it adheres strongly to the preceding sheet 1 and the concrete surface 10, and the new sheet 1 ′ is irradiated with ultraviolet rays to adhere to the preceding sheet 1 and the concrete surface 10 for repair. It is characterized by reinforcing.

Invention of Claim 3 in the repair method of the concrete structure using the photocurable fiber reinforced resin sheet of Claim 1 or 2,
The pressure and vibration are simultaneously applied to the photocurable fiber reinforced resin sheet 1 or the pressure is applied to the photocurable fiber reinforced resin sheet 1 and then the vibration is applied to bring the sheet 1 into close contact with the concrete surface 10. To do.

Invention of Claim 4 in the repair method of the concrete structure using the photocurable fiber reinforced resin sheet as described in any one of Claims 1-3 ,
Immediately after the photocurable fiber reinforced resin sheet 1 is brought into close contact with the surface of the concrete structure 3 where repair is necessary by applying pressure and vibration, or simultaneously with ultraviolet light or by applying pressure and vibration. The photocurable fiber reinforced resin sheet 1 is cured by irradiating with ultraviolet rays.

  According to the method for repairing a concrete structure using the photocurable fiber-reinforced resin sheet of the present invention, the photocurable FRP sheet 1 applied to the concrete surface 10 applies vibration at the same time as pressure is applied, or Since the vibration is applied after the pressure is applied, it is possible to flexibly follow and adhere to the details of the rough concrete surface 10. In this way, since the ultraviolet ray is irradiated in a state where the photocurable FRP sheet 1 is completely adhered to the concrete surface 10, the adhesive strength of the photocurable FRP sheet 1 is dramatically increased, and the concrete structure 3 is cracked 4 or peeled off. It is possible to effectively repair and reinforce the fall.

  In addition, the photocurable FRP sheet 1 cut according to the size of the repair-required part is necessary for an effective or effective part to suppress or prevent the progress of the progressive crack 4 or peeling. As long as it is applied and bonded by the above method, it is possible to effectively suppress and prevent the crack 4 and the progress of peeling.

Place the photo-curable FRP sheet 1 on the concrete structure 3 where it needs to be repaired , press the photo-curable FRP sheet 1 with the pressing roller 7 to apply the required pressure, and further apply vibration by the vibrator, or vibrator Then, the pressure roller 7 is vibrated to apply pressure and vibration so that the sheet 1 is brought into close contact with the concrete surface 10.

An embodiment of a concrete structure repairing method using the photocurable FRP sheet according to the present invention will be described with reference to the drawings.
FIG. 1 shows a form before use of the photocurable FRP sheet used in the present invention. Reference numeral 1 in FIG. 1 is a photocurable FRP sheet (thickness of about 2 mm), and reference numeral 2 is a translucent coating film (thickness of about 1 mm) that covers and protects the surface of the same photocurable FRP sheet 1. is there.

  The main constituent material of the photocurable FRP sheet 1 used in the present invention is, for example, a polyester resin. It is reinforced by impregnating it with continuous fibers such as glass fibers, and has sufficient strength for repair and reinforcement. Further, it contains a photopolymerization initiator that reacts and decomposes when absorbing ultraviolet rays, a monomer that reacts with the decomposed photopolymerization initiator, an oligomer, various additives, and the like.

  When this photocurable FRP sheet 1 is irradiated with ultraviolet rays by an ultraviolet irradiation device 9 or the like, which will be described later, the photopolymerization initiator reacts and decomposes, reacts with resin components such as monomers and oligomers, and this reaction product. Reacts with the resin component in a chain to increase the molecular weight, cures in about 20 seconds, and exhibits adhesive performance. The covering films 2 and 2 are for protecting the adhesive surface of the photo-curable FRP sheet 1 before use, and when used, the covering film 2 on the adhesive surface side is peeled off to the surface 10 of the concrete structure 3. Stick. The front surface side covering film 2 is left until the adhesive operation of the photocurable FRP sheet 1 is completed.

  FIG. 2 illustrates a cross-sectional view of a concrete structure 3 that needs repair and reinforcement. The inspection and confirmation of the presence / absence of repairs are made, for example, on the concrete surface 10 using a photographing device such as a high-definition camera, digital camera, optical camera, etc., and the concrete structure 3 detected using an infrared sensor for the inside of the concrete. Determine based on the temperature of In this way, it is possible to accurately determine and specify the presence or progress of an initial stage that is difficult to be determined and specified by the naked eye or an internal repair-necessary portion, for example, the jumper 5 or the crack 4. Therefore, necessary repair and reinforcement measures can be performed at an early stage, and deterioration of the concrete structure 3 can be suppressed and prevented at an early stage.

  When repairing a repair-required location determined and identified by a photographing device such as the camera or a temperature measured by an infrared sensor, dirt, foreign matter, etc. are adhered to the concrete surface 10. If so, the adhesive strength of the photo-curable FRP sheet 1 is lowered, so that these stains, foreign matters and the like are cleaned cleanly in advance.

  FIG. 3 shows a stage in which the photo-curable FRP sheet 1 is applied to and brought into close contact with the concrete surface 10 where the concrete structure 3 needs to be repaired. The photo-curable FRP sheet 1 is packed with a structure that prevents the invasion of ultraviolet rays, and is carried to the site. When the packaging is unpacked at the site, the optimal size and shape are determined according to the size and shape of the specified repair-required parts. Cut quickly and use. The photocurable FRP sheet 1 can be easily cut with, for example, scissors, a cutter, etc., and can be cut on-site as necessary, which is convenient. It is also economical because it can be cut to the minimum size while checking the size of the parts that need repair.

The photocurable FRP sheet 1 cut into a size and shape necessary or effective for repairing peels off only the coating film 2 on the adhesive surface side, and quickly applies the surface to the repair-necessary portion of the concrete surface 10. Then, for example, a pressure of a necessary and sufficient level is applied to the light curable FRP sheet 1 using a pressing roller 7 or the like, and the same light curable FRP sheet 1 is vibrated with a vibrator or the like to make the sheet 1 a concrete surface 10. Press to close.
In addition, it can also be suitably carried out by vibrating the pressing roller 7 or the like with a vibrator or the like to simultaneously apply pressure and vibration to the photocurable FRP sheet 1 and press the sheet 1 against the concrete surface 10 to be in close contact therewith.
The photocurable FRP sheet 1 is deformed by flexibly following the movement of the pressing roller 7, and is intimately familiar with the unevenness of the concrete surface 10 and effectively adheres. The photo-curing type FRP sheet 1 can be more closely adapted and effectively adhered to the concrete surface 10 by using, for example, an uneven surface of the pressing roller 7. Or you may make it stick by hitting with a wooden mallet etc. or adding vibrations, such as a vibrator.

  FIG. 4 shows a step of irradiating the photocurable FRP sheet 1 adhered to the concrete surface 10 by the above-described treatment with ultraviolet rays. An ultraviolet irradiation device 9 that emits ultraviolet light is installed at a position in front of the concrete surface 10 to which the photocurable FRP sheet 1 is in close contact, and ultraviolet light is applied to the photocurable FRP sheet 1 by the ultraviolet irradiation device 9. Irradiate for a time until it fully cures. Then, the photocurable FRP sheet 1 is instantly completely cured and adhered to the concrete surface 10 to exhibit the effect of repair and reinforcement. Then, the surface side coating film 2 is peeled off.

  Note that the photocurable FRP sheet 1 returns to the shape of the resin itself as time passes. In order to prevent this so-called spring effect, the photocurable FRP sheet 1 is brought into close contact with pressure and vibration, and simultaneously irradiated with ultraviolet light, or after being brought into close contact with pressure and vibration, ultraviolet light is immediately irradiated. And if the said photocurable FRP sheet 1 is hardened, it can be made to adhere to the concrete surface 10 effectively.

FIG. 5 illustrates a cross-sectional view of the repaired and reinforced concrete structure 3. The adhesive strength of the photo-curable FRP sheet 1 that is cured in response to ultraviolet rays and adhered to the concrete surface 10 is about ^2.5 N / mm ² . In addition, the repaired and reinforced concrete surface 10 has a natural appearance with an appearance almost the same as that before repairing and reinforcing, since the bonded photocurable FRP sheet 1 is thin and transparent.

  FIG. 6 shows an embodiment according to the second aspect of the present invention. This Example 2 is a new photocurable FRP in which a part of the concrete structure 3 is overlapped on the photocurable FRP sheet 1 previously bonded to a repair-required portion with respect to the progress of the jumper 5 and crack 4 of the concrete structure 3. It is characterized by adhering the sheet 1 '. As a joint effect of the old and new photo-curing FRP sheets 1, 1 ', the effectiveness of repair is exhibited. The means for adhering the new photocurable FRP sheet 1 ′ to the photocured FRP sheet 1 and the concrete surface 10 bonded in advance is the same as the adhering means described in the first embodiment. In addition, the adhesive strength of the part which overlaps with the light-curing type FRP sheet 1 adhered in advance exhibits the same strength as the adhesive strength adhered to the concrete surface 10.

  Even if the preceding photocurable FRP sheet 1 is present, the thickness is as thin as about 2 mm, and it is transparent, so that it is not affected by the photocurable FRP sheet 1, such as a high-vision camera, digital camera, optical camera, etc. Cracks and the like of the concrete surface 10 can be measured using a photographing device. Moreover, it can measure using an infrared sensor about the junker 5 inside a concrete, a cavity, etc. Therefore, the repaired and reinforced concrete surface 10 can also accurately check the progress of the junkers 5 and cracks 4 periodically. In addition, the repair method of the invention according to claim 4 is effective immediately for suppressing and preventing the progress of the jumper 5 and the crack 4 discovered by the inspection. Since the new photocurable FRP sheet 1 ′ is bonded in a partially wrapped state to the previously bonded photocurable FRP sheet 1, there is no problem of repair or lack of reinforcement due to the joint.

  In addition, although the Example of this invention was described above, this invention is not limited to such an Example at all, In the range which does not deviate from the summary of this invention, it can implement with a various form.

It is shape sectional drawing before use of a photocurable FRP sheet. It is sectional drawing of the concrete structure which has a repair required location. It is explanatory drawing which shows the step which closely_contact | adheres a photocurable FRP sheet to a repair required location. It is explanatory drawing which showed the step which irradiates an ultraviolet-ray to a photocurable FRP sheet. It is sectional drawing of the concrete surface repaired and reinforced. It is explanatory drawing which shows the Example which added and repaired the novel photocurable FRP sheet in the progress of a repair required location.

Explanation of symbols

1 Photocurable fiber reinforced resin sheet (photocurable FRP sheet)
1 'New photocurable fiber reinforced resin sheet (photocurable FRP sheet)
3 Concrete structure 4 Crack 5 Junker 7 Press roller 10 Concrete surface

Claims (4)

A photocurable fiber reinforced resin sheet that cures and adheres when exposed to ultraviolet light is applied to the surface of the concrete structure where repair is required, and the light curable fiber reinforced resin sheet is pressed against the surface of the concrete to apply ultraviolet light. In the method of repairing by bonding with irradiation,
Press the light-curing fiber reinforced resin sheet applied to the surface of the repaired part of the concrete structure with a pressure roller to apply the required pressure, and add vibration by the vibrator, or vibrate the pressure roller with the vibrator. The photocurable fiber reinforced resin sheet is characterized in that the sheet is strongly adhered to the concrete surface by applying pressure and vibration, and the sheet is cured by irradiating the sheet with ultraviolet rays to be adhered to the concrete surface for repair and reinforcement. Repair method of concrete structure using A part of a light-curable fiber reinforced resin sheet that has been previously bonded to the repair-required part of the concrete structure is peeled off and the crack progresses. Applying the pressure of the required size by pressing this new sheet with the pressing roller, applying the pressure of the vibrator, or vibrating the pressing roller with the vibrator and applying pressure and vibration. A photo-curable fiber reinforced resin sheet, which is strongly adhered to the preceding sheet and the concrete surface, and is repaired and reinforced by irradiating the new sheet with ultraviolet rays to adhere to the preceding sheet and the concrete surface. Repair method of used concrete structure.   The pressure and vibration are simultaneously applied to the photocurable fiber reinforced resin sheet, or the pressure is applied to the photocurable fiber reinforced resin sheet and then the vibration is applied to closely adhere the sheet to the concrete surface. A method for repairing a concrete structure using the photocurable fiber-reinforced resin sheet described in 1 or 2. Irradiate UV light simultaneously with pressure and vibration to the surface of the concrete structure where repair is necessary, and apply UV light, or apply pressure and vibration, and then immediately apply UV light. The method of repairing a concrete structure using the photocurable fiber-reinforced resin sheet according to any one of claims 1 to 3 , wherein the photocurable fiber-reinforced resin sheet is cured by irradiation.

Images