JP3627931B2 - Concrete surface repair structure and concrete surface repair method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concrete surface repair structure in which a concrete surface is repaired by disposing a fiber base material on the concrete surface, and a concrete surface repair method.
[0002]
[Prior art]
For example, concrete cast on tunnel lining walls and bridge balustrades deteriorates due to various factors such as poor construction during construction, aging degradation, cracks caused by earthquakes and land subsidence. There is a risk that the concrete piece may come off from such deteriorated concrete, and it is necessary to repair it immediately.
[0003]
Conventionally, as a method of repairing the concrete surface, a new concrete having a certain thickness is placed on the existing concrete surface, or a reinforcing member such as a steel plate or a fiber reinforced PC plate is disposed on the concrete surface to reinforce the concrete surface. There is a method of filling mortar between a member and a concrete surface.
[0004]
However, the method of placing new concrete with a certain thickness on the existing concrete surface requires a large-scale concrete placement facility, and the construction cost is high. In particular, when repairing a tunnel lining wall, it is often difficult to employ a tunnel because there is generally no allowance in the inner cross section of the tunnel.
[0005]
In addition, the method of disposing reinforcing members such as steel plates and fiber reinforced PC plates involves carrying relatively heavy objects such as steel plates and fiber reinforced PC plates, and welding operations such as steel plates. In addition, a mortar filling operation for bringing a steel plate, a fiber reinforced PC plate, or the like into close contact with the concrete surface is also required, which requires time and labor for construction.
[0006]
What has been developed in such a situation is a method of adhering a fiber base material to a concrete surface, and the technique shown in JP-A-2001-355343 is one of them. This method using a fiber base material is a method in which a fiber base material in which fiber bundles are arranged in one direction or two or more directions is bonded to a concrete surface with an adhesive. In such a repair method, a relatively lightweight fiber base material is bonded to the concrete surface with an adhesive, and therefore, compared with the conventional repair method, large-scale concrete placing equipment, heavy material transportation Work, welding work, mortar filling work, etc. are unnecessary and workability is good. In particular, the fiber base material described in the above publication is configured so that the concrete surface can be visually recognized even in the state of being disposed on the concrete surface, so that the concrete surface can be visually inspected even after repair. It has become. Therefore, if a serious deformation occurs on the concrete surface, this deformation can be confirmed immediately and appropriate measures can be taken.
[0007]
[Problems to be solved by the invention]
By the way, in the general method using a fiber base as described in the above publication, the fiber base is cured by an adhesive. Therefore, in the joint portion where deformation is concentrated when an earthquake force is applied, the fiber base material is disposed close to the joint portion so as to avoid the damage.
However, since the deformation is concentrated in this joint portion when the seismic force is applied as described above, the deterioration of the concrete is remarkable. Therefore, peeling off of concrete pieces and the like are more likely to occur than other parts, and joint parts need to be repaired separately. That is, it has been pointed out that it is necessary to repair the joint portion separately after arranging the fiber base material so as to avoid the joint portion, and it takes a lot of work.
[0008]
An object of the present invention is to provide a concrete surface repair structure and concrete that can easily and inexpensively repair joints when repairing the concrete surface by disposing a fiber base material on the concrete surface. It is to provide a surface repair method.
[0009]
[Means for Solving the Problems]
In order to solve the above problem, the invention described in claim 1 is, for example, as shown in FIGS.
In the repair structure of the concrete surface in which the concrete surface 10b is repaired by bonding the fiber substrate 12 to the concrete surface 10b,
The fiber base material 12 is disposed and bonded in a state of straddling the joint portion 10a having a gap on the concrete surface 10b,
A portion along the joint portion 10a of the fiber base 12 is impregnated with a permeation preventive agent 14 that prevents permeation of the adhesive 13.
[0010]
According to the first aspect of the present invention, the portion along the joint portion of the fiber base material, which is disposed and bonded in a state of straddling the joint portion having a void on the concrete surface, is infiltrated with adhesive. Impregnated with a penetration inhibitor to prevent. Thereby, the part along the said joint part of the said fiber base material has a deformation | transformation follow-up capability in order that the said adhesive agent does not osmose | permeate. Therefore, even if a deformation occurs near the joint when an earthquake force or the like is applied, a portion along the joint of the fiber base is deformed so as to follow the deformation. There is no damage. That is, since the fiber reinforcing material can be disposed on the concrete surface so as to continuously cover the joint from other parts, the joint can be repaired easily and inexpensively as compared with the conventional case. it can.
[0011]
Examples of the fiber base material include carbon fiber, glass fiber, and aramid fiber. These fiber base materials include those in which fiber bundles are arranged in one direction and those in which two or more directions are arranged.
[0012]
Examples of the adhesive include curable resins such as epoxy resins, vinyl ester resins, unsaturated polyester resins, and acrylic resins, and those having transparency are desirable.
[0013]
Examples of the penetration preventing member include silicon resin.
[0014]
The invention according to claim 2 is a concrete surface repair structure according to claim 1, for example, as shown in FIG.
The fiber substrate 12 is characterized in that the concrete surface 10b is visible so as to be adhered to the concrete surface 10b.
[0015]
Note that the fiber bundle itself may be transparent or opaque, and in the case of being opaque, there is a gap as described above between the fiber bundles, and it is only necessary that the concrete surface is visible through this gap.
[0016]
According to the invention described in claim 2, since the concrete surface of the fiber base material can be visually recognized in the state of adhesion to the concrete surface, the fiber base material is adhered to the concrete surface to repair the concrete surface. Even after being performed, the concrete surface can be visually confirmed and visually inspected. Therefore, if a serious deformation occurs on the concrete surface, this deformation can be confirmed immediately and appropriate measures can be taken.
[0017]
In addition, in order to configure the fiber base so that the concrete surface can be visually recognized in an adhesive state with respect to the concrete surface, for example, a gap of a predetermined size is formed between fiber bundles constituting the fiber base. You can do it. In this case, the adhesive is desirably translucent or transparent, and in particular, the adhesive having a visible light transmittance of 0.1 mm thick cured body is preferably greater than 0.1.
[0018]
The invention according to claim 3 is a concrete surface repair structure according to claim 1 or 2, as shown in FIG.
The fiber base 12 is further fixed to the concrete surface 10b by a fixing material (an embedded anchor pin 15).
[0019]
According to invention of Claim 3, the said fiber base material is further fixed to the concrete surface by the fixing material. Therefore, the adhesion of the fiber base material to the concrete surface can be reinforced.
[0020]
Examples of the fastening material include anchor bolts and embedded anchor pins. Here, the embedded anchor pin is a small anchor configured such that the end portion expands, and after being inserted into an anchor fixing hole formed in the existing concrete, it is fixed to the concrete by expanding the end portion. It is what is done. At this time, it is desirable to use a combination of mechanical fixing by filling a curable resin between the anchor fixing hole and the embedded anchor pin and enlarging the end portion and adhesive fixing by the curable resin.
[0021]
The invention according to claim 4 is a concrete surface repair structure according to any one of claims 1 to 3, for example, as shown in FIG.
A notch 10a1 is formed on the surface side of the joint 10a,
The notch 10a1 is characterized by being filled with a curable filler (mortar 11) substantially flush with the concrete surface 10b.
[0022]
According to a fourth aspect of the present invention, a notch is formed on the surface side of the joint, and the notch is filled with a curable filler substantially flush with the concrete surface. In other words, joints where deterioration of concrete is generally greater than other parts are repaired by filling with a curable filler. Therefore, peeling of the concrete piece from the joint can be reliably prevented.
[0023]
The invention according to claim 5 is a concrete surface repair structure according to any one of claims 1 to 4, for example, as shown in FIG.
The concrete 10 is characterized in that it is placed as a lining wall a1 of the tunnel a.
[0024]
According to the invention described in claim 5, it is possible to easily and inexpensively repair the concrete surface placed as a tunnel lining wall.
[0025]
The invention according to claim 6 is the concrete surface repair structure according to any one of claims 1 to 4,
The concrete 10 is characterized in that it is placed in a balustrade part of a bridge.
[0026]
According to invention of Claim 6, repair of the concrete surface cast in the balustrade part of a bridge can be performed easily and cheaply.
[0027]
The balustrade is also called a balustrade and is a workpiece formed on the end of a bridge or the like for the purpose of preventing falling, scattering, soundproofing, decoration, and the like.
[0028]
The invention described in claim 7
In the concrete surface repairing method of repairing the concrete surface 10b by adhering the fiber substrate 12 to the concrete surface 10b,
Applying an adhesive 13 for adhering the fiber substrate 12 to the concrete surface 10b;
A step of arranging and bonding the fiber base material 12 so as to straddle the joint portion 10a having a gap on the concrete surface 10b;
A step of impregnating a portion along the joint portion 10a of the fiber base 12 with a permeation preventive agent 14 for preventing the adhesive 13 from permeating.
[0029]
According to invention of Claim 7, the said fiber base material is arrange | positioned so that the space | gap part with a space | gap of a concrete surface may be straddled, and it applies to the concrete surface in order to adhere | attach the said fiber base material with respect to a concrete surface The applied adhesive does not penetrate into the portion along the joint portion of the fiber base material by the penetration preventing material. Thereby, the part along the said joint part of the said fiber base material has a deformation | transformation follow-up capability in order that the said adhesive agent does not osmose | permeate. Therefore, even if a deformation occurs near the joint when an earthquake force or the like is applied, a portion along the joint of the fiber base is deformed so as to follow the deformation. There is no damage. That is, since the fiber reinforcing material can be disposed on the concrete surface so as to continuously cover the joint from other parts, the joint can be repaired easily and inexpensively as compared with the conventional case. it can.
[0030]
The invention according to claim 8 is the method for repairing a concrete surface according to claim 7,
Before the step of applying the adhesive 13 to the concrete surface 10b,
A cutout portion 10a1 is formed on the surface side of the joint portion 10a, and the cutout portion 10a1 is filled with a curable filler (mortar 11) substantially flush with the concrete surface 10b.
[0031]
According to invention of Claim 8, before the process of apply | coating the said adhesive agent to the concrete surface, a notch part is formed in the surface side of the said joint part, and this notch part is substantially the said concrete surface. The surface is filled with a curable filler. That is, joints where deterioration of concrete is generally greater than other parts are repaired by filling with a curable filler. Therefore, peeling of the concrete piece from the joint can be reliably prevented.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a concrete surface repair structure and a concrete surface repair method according to the present invention will be described in detail with reference to FIGS.
The concrete surface repair structure according to the present invention is used to repair the concrete surface 10b of the concrete 10 placed on the lining wall a1 of the tunnel a, the balustrade of the bridge, or the like.
[0033]
Hereinafter, the concrete 10 placed as the lining wall a1 of the tunnel a will be described as an example. In FIG. 1, reference numeral 10 indicates concrete.
[0034]
The concrete 10 to be cast as the lining wall a1 of the tunnel a is generally partitioned so that joint portions 10a having gaps at predetermined intervals are formed as shown in FIGS. 1 (a) and 1 (b). Thus, cracks, deformations, and the like in the case where an earthquake force is applied to the joint portion 10a are concentrated.
[0035]
A cutout portion 10a1 is formed on the surface side of the joint portion 10a. The cutout portion 10a1 is filled with mortar 11 (curable filler) substantially flush with the concrete surface 10b. That is, the joint portion 10 a in which the deterioration of the concrete 10 is generally larger than other portions is repaired by the mortar 11.
[0036]
The fiber base material 12 according to the present invention is disposed so as to straddle the joint portion 10 a with respect to the concrete surface 10 b, that is, continuously in the joint portion 10 a, and is bonded by the adhesive 13. The adhesive 13 is preferably an acrylic resin that is a curable resin and has transparency.
[0037]
By adhering the fiber base 12 to the deteriorated concrete surface 10b, the concrete surface 10b is repaired so as to prevent the stripping of the concrete pieces from the concrete surface 10b.
Further, since the fiber base 12 is cured integrally with the adhesive 13, not only the concrete surface 10b is repaired by the fiber base 12 but also the concrete 10 is reinforced.
[0038]
By the way, as described above, the fiber base material 12 is disposed and bonded to the concrete surface 10b so as to straddle the joint portion 10a. However, the fiber base material 12 has a portion along the joint portion 10a. Is pre-impregnated with a penetration inhibitor 14 of an adhesive 13 such as silicon resin. Therefore, the penetration of the adhesive 13 is prevented in the portion along the joint portion 10 a of the fiber base material 12, whereby the portion along the joint portion 10 a of the fiber base material 12 is cured by integration with the adhesive agent 13. And has the ability to follow deformation.
[0039]
Even if deformation occurs in the vicinity of the joint portion 10a when seismic force or the like is applied due to this deformation follow-up ability, the portion along the joint portion 10a of the fiber base 12 is deformed so as to follow this deformation. The fiber base 12 is not damaged.
[0040]
Here, as shown in FIG. 2A, for example, the fiber base 12 is configured such that fiber bundles 12a are arranged in a sheet shape in two directions, and a side length 12b is provided between the arranged fiber bundles 12a. And at least one of 12b or 12c is set to 2 mm or more and equal to or less than the minimum width of the fiber base 12.
[0041]
In the fiber base 12, for example, as illustrated in FIG. 2B, fiber bundles 12 a may be arranged in a sheet shape in three directions. In this case, there are gaps having side lengths 12d, 12e, and 12f between the arranged fiber bundles 12a, and at least one of 12d, 12e, and 12f is 2 mm or more and less than the minimum width of the fiber base 12 Is set to
[0042]
The fiber base 12 configured as described above can visually recognize the concrete surface 10b through the gap in an adhesive state with respect to the concrete surface 10b. Thereby, even after the fiber base 12 is bonded to the concrete surface 10b and the concrete surface 10b is repaired, the concrete surface 10b can be visually confirmed and visually inspected.
[0043]
Further, as shown in FIG. 1A and the like, the fiber base 12 is fixed to the concrete surface 10b at a predetermined interval by embedded anchor pins 15 and the like, whereby the fiber base 12 is fixed to the concrete surface 10b. Adhesion is reinforced.
[0044]
As shown in FIGS. 3A and 3B, the embedded anchor pin 15 (fastening material) is a small anchor configured to expand its end, and is mechanically fixed to the concrete 10. The bottom portion 15a is a rod portion 15b, a top portion 15c having a washer 15c1 for holding and fixing the fiber base 12 to the concrete 10, a pin 15d for expanding the bottom portion 15c, and the like.
[0045]
The diameter r1 of the rod portion 15b and the diameter r2 of the crown portion 15c are generally r1 <r2. If the diameter R of the anchor fixing hole 10c formed on the concrete surface 10b is r1 <R <r2, the embedded anchor pin 15 is combined with the wedge effect of the rod portion 15b and the wedge effect of the top portion 15c, so that the concrete surface 10b The fixing effect is increasing.
[0046]
By the way, with only the mechanical fixing as described above, there is a risk that the pullout strength is lowered due to fatigue due to a long-term repeated load. In order to more securely fix the embedded anchor pin 15 to the concrete surface 10b, the anchor fixing hole 10c is filled with a curable resin 10d, and then the embedded anchor pin 15 is driven to expand the bottom. It is desirable to use adhesive fixing together.
[0047]
Below, the repair method of the concrete surface which concerns on this invention is demonstrated.
[0048]
First, a notch 10a1 is formed on the surface side of the joint 10a where the concrete 10 has a gap, and the mortar 11 is filled in the notch 10a1 substantially flush with the concrete surface 10b. That is, the joint portion 10 a where deterioration of the concrete 10 is generally larger than that of other portions is repaired by the mortar 11.
[0049]
Next, after performing a keren treatment on the concrete surface 10b, an asphalt primer is applied to the concrete surface 10b for waterproofing. When the concrete surface 10b needs to be adjusted with a putty material or the like, it is desirable to use a non-land adjuster having the same degree of transparency as the adhesive 13.
[0050]
Next, after curing for a predetermined period, an anchor fixing hole 10c having a diameter R (r1 <R <r2) is formed at a predetermined interval with respect to the concrete surface 10b by a drill or the like. The anchor fixing hole 10c may be formed after the fiber base 12 is bonded to the concrete surface 10b.
[0051]
Next, a curable resin such as an acrylic resin as the adhesive 13 is applied as a primer to the concrete surface 10b.
[0052]
Next, a portion along the joint portion 10a of the fiber base 12 is impregnated with a permeation preventive agent 14 such as a silicone resin that prevents the adhesive 13 from penetrating.
[0053]
Next, the fiber substrate 12 is disposed so as to straddle the joint portion 10a of the concrete surface 10b at the portion impregnated with the penetration inhibitor 14, and the fiber substrate 12 is pressed by a rubber roller or the like. The adhesive 13 is infiltrated into.
[0054]
Next, the adhesive 13 is further applied as a top coat to the fiber base 12 with a rubber roller or a spatula.
[0055]
The number of fiber substrates 12 attached to the concrete surface 10b is appropriately selected according to the required degree of reinforcement, but the number of the concrete surface 10b is visible.
[0056]
Next, the formed anchor fixing hole 10c is filled with a curable resin 10d, and then the embedded anchor pin 15 is driven into the anchor fixing hole 10c with a hammer or the like to expand the bottom. Note that the hole may be filled with the curable resin 10d either before or after the embedded anchor pin 15 is driven and expanded.
[0057]
Curing for a predetermined period is performed, and the fiber base 12 is cured by the adhesive 13.
[0058]
According to the present embodiment, the following effects can be obtained.
(1) A permeation preventive agent 14 for preventing the penetration of the adhesive 13 in the portion along the joint portion 10a of the fiber base material 12 disposed and bonded in a state of straddling the joint portion 10a with the gap of the concrete 10 Is impregnated. Thereby, since the part along the joint part 10a of the fiber base material 12 does not osmose | permeate, it has a deformation | transformation follow-up capability. Therefore, even when a deformation occurs in the vicinity of the joint portion 10a when an earthquake force or the like is applied, the portion along the joint portion 10a of the fiber base 12 is deformed so as to follow this deformation, and thereby the fiber base 12 Will not be damaged. That is, since the fiber base 12 can be disposed on the concrete surface 10b so as to continuously cover the joint portion 10a from other portions, the joint portion 10a can be easily and inexpensively repaired as compared with the conventional case. Can do.
[0059]
(2) Since the fiber base 12 is visible to the concrete surface 10b in the state of adhesion to the concrete surface 10b, the fiber base 12 is adhered to the concrete surface 10b to repair the concrete surface 10b. Later, the concrete surface 10b can be visually inspected and visually inspected. Therefore, if a serious deformation occurs on the concrete surface 10b, the deformation can be immediately confirmed and appropriate measures can be taken.
[0060]
(3) The fiber base material 12 is further fixed to the concrete surface 10b by embedded anchor pins 15. Therefore, the adhesion of the fiber base 12 to the concrete surface 10b can be reinforced.
[0061]
(4) A notch 10a1 is formed on the surface side of the joint 10a. The notch 10a1 is filled with mortar 11 substantially flush with the concrete surface 10b. That is, the joint portion 10a in which the deterioration of the concrete 10 is generally larger than other portions is repaired by filling the mortar 11. Therefore, peeling of the concrete piece from the joint part 10a can be reliably prevented.
[0062]
It should be noted that the present invention is not limited to the present embodiment, and arbitrary modifications can be made without departing from the spirit of the present invention.
[0063]
For example, in the present embodiment, a notch 10a1 is formed on the surface side of the joint 10a of the concrete 10, and the joint 10 is filled with the mortar 11 substantially flush with the concrete surface 10b. 10a has been repaired. However, repair of the joint portion 10a with the mortar 11 may be performed as necessary, and may not be performed in particular.
[0064]
Moreover, in this Embodiment, although the fiber base material 12 is being fixed with the embedded anchor pin 15, an anchor bolt may be sufficient. Depending on the construction situation, the embedded anchor pin 15 or the like may not be used.
[0065]
【The invention's effect】
According to invention of Claim 1 and Claim 7, the part along the said joint part of the said fiber base material arrange | positioned and bonded in the state over the joint part with the space | gap of a concrete surface is said adhesion | attachment Since the agent does not penetrate, it has a deformation following ability. Therefore, even if a deformation occurs near the joint when an earthquake force or the like is applied, a portion along the joint of the fiber base is deformed so as to follow the deformation. There is no damage. That is, since the fiber reinforcing material can be disposed on the concrete surface so as to continuously cover the joint from other parts, the joint can be repaired easily and inexpensively as compared with the conventional case. it can.
[0066]
According to the second and eighth aspects of the invention, it is possible to obtain the same effect as that of the first and seventh aspects of the invention. Even after being bonded and repairing the concrete surface, the concrete surface can be visually confirmed and visually inspected. Therefore, if a serious deformation occurs on the concrete surface, this deformation can be confirmed immediately and appropriate measures can be taken.
[0067]
According to the third aspect of the present invention, it is possible to obtain the same effect as that of the first or second aspect of the present invention, and the adhesion of the fiber base to the concrete surface is fixed. Can be reinforced by the material.
[0068]
According to the invention described in claim 4, it is possible to obtain the same effect as that of the invention described in any one of claims 1 to 3. The joints that are larger than the above are repaired by being filled with a curable filler. Therefore, peeling of the concrete piece from the joint can be reliably prevented.
[0069]
According to the fifth aspect of the present invention, it is possible to obtain the same effect as that of the first aspect of the present invention, as well as a tunnel lining wall. It is possible to easily and inexpensively repair the concrete surface.
[0070]
According to the invention described in claim 6, it is possible to obtain the same effect as that of the invention described in any one of claims 1 to 4, as well as to be placed in the balustrade part of the bridge. Repair of the concrete surface can be performed easily and inexpensively.
[Brief description of the drawings]
FIGS. 1A and 1B are plan sectional views showing a concrete surface repaired by a concrete surface repair structure according to the present invention.
FIGS. 2A and 2B are diagrams showing a fiber base material used for a concrete surface repair structure according to the present invention.
FIGS. 3A and 3B are views showing an embedded anchor pin used in a concrete surface repair structure according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Concrete 10a Joint part 10a1 Notch part 10b Concrete surface 11 Mortar (hardening filler)
12 Fiber base material 13 Adhesive 14 Penetration preventing material 15 Implantable anchor pin (fastening material)
a Tunnel a1 lining wall

Claims (8)

In the repair structure of the concrete surface in which the concrete surface is repaired by bonding the fiber base material to the concrete surface,
The fiber base material is disposed and bonded in a state of straddling a joint part having a void on the concrete surface,
A repair structure for a concrete surface, wherein a portion along the joint portion of the fiber base material is impregnated with a permeation preventive agent for preventing permeation of an adhesive. The concrete surface repair structure according to claim 1, wherein the fiber substrate is configured such that the concrete surface can be visually recognized in an adhesive state with respect to the concrete surface. The repair structure for a concrete surface according to claim 1 or 2, wherein the fiber base material is further fixed to the concrete surface by a fixing material. A notch is formed on the surface side of the joint,
The repair structure for a concrete surface according to any one of claims 1 to 3, wherein the cutout portion is filled with a curable filler substantially flush with the concrete surface. The concrete surface repair structure according to any one of claims 1 to 4, wherein the concrete is placed as a lining wall of a tunnel. The concrete surface repair structure according to any one of claims 1 to 4, wherein the concrete is placed in a railing portion of a bridge. In the concrete surface repair method of repairing the concrete surface by adhering the fiber substrate to the concrete surface,
Applying the adhesive for adhering the fiber base material to the concrete surface, arranging the fiber base material so as to straddle the joint portion having a void on the concrete surface, and bonding,
And a step of impregnating a portion of the fiber base material along the joint portion with a permeation inhibitor that prevents permeation of the adhesive. Before the step of applying the adhesive to the concrete surface,
8. The method for repairing a concrete surface according to claim 7, wherein a notch is formed on the surface side of the joint, and the notch is filled with a curable filler substantially flush with the concrete surface. .

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