CN114207232A - Maintenance structure and maintenance sheet for repaired part of concrete surface - Google Patents
Maintenance structure and maintenance sheet for repaired part of concrete surface Download PDFInfo
- Publication number
- CN114207232A CN114207232A CN202080055706.1A CN202080055706A CN114207232A CN 114207232 A CN114207232 A CN 114207232A CN 202080055706 A CN202080055706 A CN 202080055706A CN 114207232 A CN114207232 A CN 114207232A
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- Prior art keywords
- adhesive
- sheet
- curing
- curing sheet
- main body
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/24—Safety or protective measures preventing damage to building parts or finishing work during construction
- E04G21/246—Safety or protective measures preventing damage to building parts or finishing work during construction specially adapted for curing concrete in situ, e.g. by covering it with protective sheets
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
Abstract
A curing sheet (11) is bonded to the surface (50a) of an existing concrete column (50) so as to cover the processed surface (55a) of the repair mortar (55) filled in the repair recess (52). The curing sheet (11) comprises a non-adhesive dividing section (12) and an adhesive annular dividing section (13) continuously provided in an annular shape on the outer peripheral section thereof, on the back side of the curing sheet bonded to the surface of the concrete column (50). The curing sheet (11) is attached so as to cover the processing surface (55a) of the repair mortar (55) by bonding the adhesive annular dividing section (13) to a region surrounding the outside of the processing surface (55a) of the repair mortar (55) in a state in which the non-adhesive dividing section (12) is overlapped with the entire processing surface (55a) of the repair mortar (55).
Description
Technical Field
The present invention relates to a repaired portion maintenance structure and a maintenance sheet for a concrete surface, and more particularly, to a repaired portion maintenance structure for a concrete surface which is maintained so that moisture is not volatilized from a cement-based curing material filled in a repair recess portion on the surface of an existing concrete structure, and a maintenance sheet for use in the repaired portion maintenance structure.
Background
In the surface of a conventional concrete structure, for example, a damaged portion may be caused by a crack or the like due to aged deterioration or the like, and when the crack becomes severe, rainwater, a deterioration factor or the like entering through the crack may reach a reinforcing steel bar embedded in the concrete and corrode the reinforcing steel bar, thereby lowering the strength of the concrete structure. As a method for repairing a damaged portion, the following method is generally employed: a repair recess is formed by chiseling out a repair area including a damaged portion generated on the surface of existing concrete, a cement-based curing material such as mortar or cement paste is filled in the formed repair recess, and the surface of the filled cement-based curing material is leveled with the surface of the surrounding concrete by using, for example, a trowel (finishing).
In addition, the following concrete surface repairing method is also disclosed: after the surface of the cement-based curing material filled in the recess for repair is finished, a colored repair sheet having a large number of colored particulates distributed on an adhesive layer provided on one surface of a base material is adhered to the machined surface via the adhesive layer, and after the filled cement-based curing material is cured, the colored repair sheet is peeled off in a state where the colored particulates are adhered to the machined surface, thereby repairing the damaged portion (see, for example, patent document 1).
In addition, when concrete is poured to form a new concrete structure, as a concrete curing adhesive tape to be bonded to the surface of the concrete for curing the poured concrete, an adhesive tape made of a non-permeable base layer and an adhesive layer provided on one surface of the base layer is disclosed (for example, see patent document 2).
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 2676575
Patent document 2: japanese patent No. 5683504
Disclosure of Invention
Since the cement-based curing material filled in the repairing recess for repairing a damaged portion generated on the concrete surface is a material that cures by a hydration reaction between the water contained therein and the cement, if the material is allowed to cure in the natural environment after the formation of the processed surface, the water necessary for the hydration reaction is likely to be insufficient due to volatilization, poor adhesion to the interface with the existing concrete occurs, or the strength is likely to be insufficient due to a decrease in temperature, and the filled cement-based curing material after curing is likely to be damaged or peeled off due to cracks.
Further, it is also conceivable to use the colored repair sheet of patent document 1 or the adhesive tape for concrete curing of patent document 2, curing the cement-based curing material filled in the repair recess so as not to volatilize water, but since these repair sheets or adhesive tapes are used by adhering an adhesive layer to a work surface to be covered or the entire concrete surface, therefore, for example, when the adhesive force by the adhesive layer is high, and the above-mentioned mending sheet or adhesive tape adhered to the working surface of the cement-based curing material filled in the mending recess is peeled off from the working surface, the repairing sheet or the pressure-sensitive adhesive tape is peeled off from the working surface in a state where a part of the cement-based curing material is adhered due to the adhesive force thereof, or the cement-based curing material is peeled off with the adhesive remaining on the processed surface, and the processed surface of the cured cement-based curing material is easily roughened.
The object of the present invention is to provide a maintenance structure for a repaired portion of a concrete surface, which can effectively maintain a cement-based curing material filled in a repair recess portion for repairing a damaged portion occurring on the surface of an existing concrete structure without volatilizing water, and which can be easily and easily implemented without roughening the processed surface of the cured cement-based curing material, and a maintenance sheet for the maintenance structure.
The present invention achieves the above-described object by providing a repaired portion maintenance structure of a concrete surface, which is a concrete surface that is maintained so as not to volatilize water from a cement-based curing material filled in a repair recess formed in a repair area including a damaged portion generated on a surface of an existing concrete structure, wherein the repaired portion maintenance structure is configured by bonding a maintenance sheet material to the surface of the existing concrete structure so as to cover a processed surface of the cement-based curing material filled in the repair recess, and the maintenance sheet material is formed in such a manner that: the curing sheet is attached so as to cover the processed surface of the cement-based hardening material by including a non-adhesive dividing portion and an adhesive annular dividing portion on the back surface side to be bonded to the surface of the existing concrete structure, the non-adhesive dividing portion being overlapped with the processed surface of the cement-based hardening material and a region surrounding the entire surface of the processed surface, and the adhesive annular dividing portion being continuously provided in an annular shape on the outer peripheral portion of the non-adhesive dividing portion, and bonding the adhesive annular dividing portion to a region surrounding the outer side of the processed surface of the existing concrete structure in a state where the non-adhesive dividing portion is overlapped with the entire processed surface.
In the repair site maintenance structure for a concrete surface according to the present invention, it is preferable that the maintenance sheet is attached so as to cover the processed surface of the cement-based curing material in a state where the thermal insulation sheet is interposed between the processed surface of the cement-based curing material and the non-adhesive dividing portion.
The present invention also provides a curing sheet for use in the above-described structure for curing a repaired part of a concrete surface, the curing sheet comprising: a curing sheet main body having non-permeability and coated with an adhesive on the entire back surface side; and a base material sheet that is overlapped with and bonded to the back surface side of the curing sheet main body to which the adhesive agent is applied in a peelable manner, wherein a separation guide line is provided on the base material sheet along a ring-shaped line that divides the non-adhesive dividing portion and the adhesive ring-shaped dividing portion, and when the base material sheet is bonded to the surface of an existing concrete structure, the base material sheet on the outer side portion of the separation guide line is separated while the inner side portion of the separation guide line is left, and the separated outer side portion is peeled and removed from the back surface of the curing sheet main body, thereby forming on the back surface side of the curing sheet main body: the non-adhesive dividing portion based on the remaining inner portion of the base material sheet; and the adhesive ring-shaped dividing portion based on the removed outer portion.
The present invention also provides a curing sheet for use in the above-described structure for curing a repaired part of a concrete surface, the curing sheet comprising: a curing sheet main body having non-permeability and coated with an adhesive on the entire back surface side; and a base material sheet which is overlapped with the back surface side of the curing sheet main body coated with the adhesive and is bonded in a peelable manner, in a state that a non-adhesive sheet is sandwiched between the base material sheet and the non-adhesive dividing part at the back surface side of the curing sheet main body, the base material sheet is overlapped with the back surface side of the curing sheet main body and is bonded, when the base material sheet is bonded on the surface of the existing concrete structure, the base material sheet is peeled and removed from the back surface of the curing sheet main body in a state that the non-adhesive sheet is remained, so that the base material sheet is formed on the back surface side of the curing sheet main body: the non-adhesive dividing portion based on the non-adhesive sheet that is left; and the adhesive ring-shaped dividing portion based on the outer portion thereof.
Further, in the case of the maintenance sheet of the present invention, the non-adhesive sheet is preferably made of a heat insulating sheet.
The present invention also provides a curing sheet for use in the above-described structure for curing a repaired part of a concrete surface, the curing sheet comprising: a curing sheet main body having non-permeability and coated with an adhesive on the back side; and a base material sheet which is superposed on the back side of the curing sheet main body on which the adhesive agent is applied and bonded in a releasable manner, wherein the adhesive agent is not applied to the non-adhesive dividing portion but only applied to the adhesive ring-shaped dividing portion which is continuously provided in a ring shape at the outer peripheral portion of the non-adhesive dividing portion on the back side of the curing sheet main body, and when the base material sheet is bonded to the surface of the existing concrete structure, the base material sheet is peeled off and removed from the back side of the curing sheet main body, thereby forming on the back side of the curing sheet main body: the non-adhesive dividing portion not coated with an adhesive; and the adhesive ring-shaped dividing portion coated with an adhesive.
In the curing sheet of the present invention, it is preferable that the base material sheet and the non-adhesive dividing portion have a rectangular planar shape, and the adhesive ring-shaped dividing portion has a rectangular ring-shaped planar shape.
The present invention also provides a curing sheet for use in the above-described structure for curing a repaired part of a concrete surface, the curing sheet comprising: a curing sheet main body having non-permeability and coated with an adhesive on the back side; and a pair of end curing sheets having air impermeability and coated with an adhesive on the back side, the curing sheet main body being cut into a rectangular shape, and the adhesive being coated on the back side of each side edge portion provided along a pair of opposing side edges, whereby the non-adhesive dividing portion is formed in a region sandwiched by the side edge portions coated with the adhesive, the end curing sheets being coated with the adhesive on the entire back side, and being bonded to the surface of the existing concrete structure by overlapping each side edge portion provided along the other pair of opposing side edges of the rectangular curing sheet main body and bonding the end curing sheets in a state in which the end curing sheets are exposed to the outside of the other pair of opposing side edges, whereby the portions of the end curing sheets exposed to the outside of the other pair of opposing side edges and the side edge portions on both sides provided along the one pair of opposing side edges of the curing sheet main body are utilized, the adhesive annular dividing portion is formed in an annular continuous manner on an outer peripheral portion of the non-adhesive dividing portion of the curing sheet main body.
In the maintenance sheet of the present invention, the maintenance sheet main body is preferably cut out in a rectangular shape from a maintenance sheet main body roll, and the maintenance sheet main body roll is preferably wound in a roll shape with side edge portions coated with an adhesive being disposed on both sides in the width direction.
In the curing sheet of the present invention, the adhesive force of the adhesive applied to the back surface of the curing sheet main body or the end curing sheet is preferably 2 to 15N/25 mm.
Drawings
Fig. 1(a) to (d) are partial sectional views of a reinforced concrete column illustrating a repaired site maintenance structure of a concrete surface according to a preferred embodiment of the present invention.
Fig. 2(a) is a schematic perspective view illustrating the structure of the curing sheet, fig. 2(b) is a schematic plan view illustrating the structure of the curing sheet, and fig. 2(c) is a schematic cross-sectional view illustrating the structure of the curing sheet.
Fig. 3(a) is a schematic perspective view illustrating the structure of another curing sheet, fig. 3(b) is a schematic plan view illustrating the structure of another curing sheet, and fig. 3(c) is a schematic cross-sectional view illustrating the structure of another curing sheet.
Fig. 4(a) is a schematic perspective view illustrating the structure of another curing sheet, fig. 4(b) is a schematic plan view illustrating the structure of another curing sheet, and fig. 4(c) is a schematic cross-sectional view illustrating the structure of another curing sheet.
Fig. 5(a) is a schematic plan view illustrating another maintenance sheet structure, and fig. 5(b) is a schematic perspective view of a maintenance sheet main body roll illustrating another maintenance sheet structure.
Detailed Description
As shown in fig. 1(a) to (d), the repaired site maintenance structure 10 of a concrete surface according to a preferred embodiment of the present invention is used as a maintenance structure for effectively maintaining a cement-based curing material 55 (see fig. 1(d)) filled in a repair recess 52 (see fig. 1(d)) formed in a damaged site 51 in order to enable such a damaged site 51 to be repaired in a stable state using a cement-based curing material 55 (see fig. 1(c)) such as mortar when the damaged site 51 caused by, for example, cracks or the like occurs in a conventional concrete structure, for example, a reinforced concrete column 50 (see fig. 1 (a)). That is, in the present embodiment, when rainwater, a deterioration factor, or the like enters the inside of the concrete from the damaged portion 51 of the existing concrete column 50 due to a crack or the like generated due to aging deterioration or the like and reaches, for example, the reinforcing steel bar 53 embedded in the concrete from the damaged portion 51 such as a crack, the reinforcing steel bar 53 may be corroded, and the strength of the concrete column 50 may be reduced, and therefore, such a damaged portion 51 is repaired with the cement-based curing material 55. The repaired part maintenance structure 10 (see fig. 1(d)) of the concrete surface according to the present embodiment has the following functions: the cement-based cured material 55 can be cured effectively so as not to volatilize water from the cement-based cured material 55 filled in the repair recess 52 formed in the damaged portion 51, and the curing can be performed easily without roughening the processed surface 55a formed of the cured cement-based cured material 55.
The repair site maintenance structure 10 for a concrete surface according to the present embodiment is a maintenance structure for performing maintenance so as not to volatilize moisture from a cement-based curing material 55, preferably a repair mortar, filled in a repair recess 52, wherein the repair recess 52 is formed by, for example, chiseling a repair area including a damage site 51 caused by, for example, a crack or the like generated on the surface of an existing concrete structure, for example, a reinforced concrete column 50, and as shown in fig. 1(a) to (d), a maintenance sheet 11 is bonded to the surface 50a of the existing concrete column 50 so as to cover a processed surface 55a of the repair mortar 55 filled in the repair recess 52. As shown in fig. 2(a) to (c), the curing sheet 11 is formed as follows: the back side to be bonded to the surface of the existing concrete column 50 includes a non-adhesive segment 12 and an adhesive ring-shaped segment 13, the non-adhesive segment 12 is overlapped on a working surface 55a of the repair mortar 55 and a region surrounding the whole working surface 55a, and the adhesive ring-shaped segment 13 is continuously provided in a ring shape on the outer peripheral portion of the non-adhesive segment 12. The curing sheet 11 is attached so as to cover the working surface 55a of the repair mortar 55 by adhering the adhesive ring-shaped dividing portion 13 to the outer region of the surface of the existing concrete column 50 surrounding the working surface 55a of the repair mortar 55 in a state where the non-adhesive dividing portion 12 is overlapped with the entire working surface 55a of the repair mortar 55 (see fig. 1 (d)).
In the present embodiment, the curing sheet 11 used for the repair site curing structure 10 for a concrete surface also includes, as shown in fig. 2(a) to (c): a curing sheet main body 14 having non-permeability and coated with an adhesive on the entire back surface side; and a base material sheet 15 that is overlapped with and bonded to the back surface side of the curing sheet main body 14 to which the adhesive is applied in a releasable manner. The base material sheet 15 is provided with a separation guide line 15a along an annular line that divides the non-adhesive dividing portion 12 and the adhesive annular dividing portion 13. When adhering to the surface of the existing concrete column 50, the base material sheet 15 of the outer portion 15c of the separation guide line 15a is separated with the inner portion 15b of the separation guide line 15a remaining, and the separated outer portion 15c is peeled off and removed from the back surface of the curing sheet main body 14, thereby forming on the back surface side of the curing sheet main body 14: a non-adhesive dividing portion 12 based on the remaining inner portion 15b of the base material sheet 15; and an adhesive ring-shaped dividing portion 13 based on the removed outer portion 15 c.
The base material sheet 15 and the non-adhesive dividing portion 12 preferably have a rectangular planar shape, and the adhesive ring-shaped dividing portion 13 preferably has a rectangular ring-shaped planar shape.
In the present embodiment, the concrete column 50, which is an existing concrete structure, is a column constituting a building or a column of a pier, for example, and the deterioration is accelerated after 30 to 50 years or more, for example, after the construction. In the present embodiment, since the concrete column 50 is a structure made of reinforced concrete, in order to repair the concrete so as to prevent rainwater, a deterioration factor, and the like from entering the concrete from a damaged portion 51 (see fig. 1(a)) such as a crack to the embedded reinforcing bars 53, a region of the concrete surface including, for example, the damaged portion 51 and having a length of about 50 to 3000mm and a width of about 50 to 3000mm is set as a repair region, and a surface portion of the concrete is cut by a known cutting device to a depth of about 20 to 100mm corresponding to the thickness of the protective layer of the reinforcing bars, for example, thereby forming a repair recess 52 (see fig. 1 (b)). Further, a known repair mortar mixed in a predetermined mixing ratio is used as a cement-based setting material 55 to be filled into the formed repair recess 52, and the repair mortar 55 is filled into the repair recess 52 and leveled with the surface of the surrounding concrete by using a trowel, thereby forming a finished surface 55a (see fig. 1 (c)). Then, the maintenance sheet 11 is attached to the surface 50a of the existing concrete column 50 by bonding it so as to cover the processed surface 55a of the repair mortar 55 filled in the repair recess 52 (see fig. 1 (d)).
In the present embodiment, as described above, the curing sheet is formed in the following manner, and includes: a curing sheet main body 14 having non-permeability and coated with an adhesive on the entire back surface side; and a base material sheet 15 that is overlapped with and bonded to the back surface side of the curing sheet main body 14 to which the adhesive is applied in a releasable manner.
As the sheet material having non-air permeability, for example, a sheet material made of paper such as japanese paper, crepe paper, and fine paper, or a sheet material obtained by laminating a resin such as polyethylene on one surface or both surfaces of a woven fabric or a knitted fabric woven from rayon, cotton, polyester, or the like, which are single or blended, long fibers such as polyester or acrylonitrile, flat yarns of polyethylene, or the like. Sheet materials made of synthetic resins such as polypropylene films and polyethylene films may also be used.
The curing sheet body 14 preferably has a thickness of about 0.05 to 0.3mm, and may be formed in a planar shape having a rectangular shape (including a square shape) with a length of about 100 to 3500mm and a width of about 100 to 3500mm as the size of the working surface 55a of the repair mortar 55 capable of covering the surface of the concrete column 50 and the area surrounding the outer side thereof.
As the adhesive applied to the entire back surface side of the curing sheet main body 14, for example, a solid or hot-melt type rubber adhesive can be used for rough surfaces. In general, a solid adhesive can be thickly formed into an adhesive layer by a coating method such as a calendering method or an extruder. When the adhesive layer is thickened, the affinity to a rough surface of concrete or the like is improved, the problem of poor adhesion is less likely to occur, and the penetration of moisture or the like between the adhesive layer and the rough surface can be prevented. The thickness of the adhesive layer for rough surface is preferably 0.02 to 0.40 mm. The adhesive for the rough surface may be an acrylic adhesive, which will be described later, or may be a polyurethane adhesive, a silicone adhesive, or the like.
Specific examples of the rubber component of the rubber-based adhesive include natural rubber, styrene butadiene rubber, butyl rubber, synthetic isoprene rubber, butadiene rubber, and the like. More than 2 kinds of rubber components may be used in combination. Among them, natural rubber is preferable.
The rubber-based adhesive preferably contains a tackifier resin. Specific examples of the tackifier resin include rosin resins such as rosin and rosin ester, terpene resins such as terpene resin, aromatic modified terpene resin, hydrogenated terpene resin and terpene phenol resin, polymerization resins such as aliphatic petroleum resin, aromatic petroleum resin, copolymer petroleum resin, alicyclic petroleum resin, coumarone-indene resin and pure monomer resin, and polycondensation resins such as phenol resin and xylene resin. More than 2 kinds of tackifier resins may be used in combination. The amount of the tackifier resin is preferably 20 to 200 parts by mass, more preferably 30 to 150 parts by mass, and particularly preferably 50 to 100 parts by mass, per 100 parts by mass of the rubber component.
The rubber-based adhesive preferably contains an extender (filler) or a processing oil. Specific examples of the extender include calcium carbonate and zinc oxide. The amount of the extender is preferably 30 to 200 parts by mass per 100 parts by mass of the rubber component. The amount of the processing oil is preferably 5 to 50 parts by mass per 100 parts by mass of the rubber component. Further, an antioxidant, a vulcanizing agent, a vulcanization accelerator, and the like may be added within a range not to impair the object of the present invention.
The pressure-sensitive adhesive applied to the entire back surface side of the curing sheet main body 14 is preferably an acrylic pressure-sensitive adhesive for smooth surfaces, for example, from the viewpoint of peelability. The thickness of the adhesive layer for smooth surface is preferably set to 0.01 to 0.10 mm. As the adhesive for a smooth surface, the same adhesive as the rubber-based adhesive described above can be used, and further, a polyurethane-based adhesive, a silicone-based adhesive, or the like can be used.
As an acrylic polymer which is a base polymer of an acrylic adhesive, a polymer containing an alkyl (meth) acrylate as a main component is generally used. Here, "(meth) acrylate" means acrylate or methacrylate. In particular, a copolymer of an alkyl (meth) acrylate and another radically polymerizable monomer is preferable. Specific examples of the alkyl (meth) acrylate include alkyl (meth) acrylates having an alkyl group having 2 to 12 carbon atoms such as ethyl (meth) acrylate, n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, n-octyl (meth) acrylate, isononyl (meth) acrylate, and lauryl (meth) acrylate, and 2 or more kinds of the alkyl (meth) acrylates may be used in combination. Examples of the copolymerizable monomer component with the acrylic ester include carboxyl group-containing monomers such as (meth) acrylic acid, maleic acid, fumaric acid and itaconic acid and anhydrides thereof, (meth) acrylonitrile, N-vinylpyrrolidone, N-vinylcaprolactam, acryloylmorpholine, (meth) acrylamide, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, dimethylaminopropylacrylamide and N-vinylacetamide, nitrogen-containing monomers such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate and caprolactone-modified (meth) acrylic ester. 2 or more copolymerizable monomer components may be used in combination.
The acrylic polymer is preferably crosslinked by a crosslinking agent. Specific examples of the crosslinking agent include isocyanate-based crosslinking agents, epoxy-based crosslinking agents, chelate-based crosslinking agents, aziridine-based crosslinking agents, and melamine-based crosslinking agents. The amount of the crosslinking agent is preferably 0.01 to 5.0 parts by mass per 100 parts by mass of the base polymer.
In the present embodiment, the adhesive force of the adhesive applied to the entire back surface side of the curing sheet body 14 is preferably 2 to 15N/25 mm. The adhesive force can be measured, for example, by the following method: using SUS304 steel plate polished with #280 water-resistant abrasive paper as an adherend, peeling was performed according to JIS Z0237 (2000) under the conditions of a peeling angle of 180 degrees, curing time after pressure bonding of 20 minutes and a peeling speed of 300 mm/min under the standard conditions of a temperature of 20 ℃ and a humidity of 60%.
The adhesive force of the adhesive for rough surfaces is preferably 6 to 15N/25mm, more preferably 8 to 12N/25mm, because it is assumed that the adhesive adheres to surfaces having severe unevenness. When the adhesive strength is less than 6N/25mm, the peeling and moisture retention effects of the curing sheet body 14 during curing may be reduced, and when the adhesive strength is more than 15N/25mm, peeling becomes difficult when peeling and removing from the surface of concrete after curing, and adhesive residue is likely to occur on the processed surface 55a of the repair mortar 55 which is filled and cured in the repair recess 52. Since the adhesive force of the adhesive for a smooth surface is assumed to be adhesion to a smooth surface, an adhesive having a relatively low adhesive force to a high adhesive force can be used. For example, an adhesive having an adhesive strength of 2 to 15N/25mm is preferably used, and an adhesive having an adhesive strength of 4 to 13N/25mm is more preferably used.
As the base sheet 15 releasably adhered to the back surface side of the curing sheet main body 14, for example, a base sheet coated with a release agent can be used. As the substrate sheet, for example, a film substrate made of a polyester film, a polypropylene film, a polyethylene film, or the like, or a paper substrate such as high-quality paper, impregnated paper, or flat paper can be used. Among them, a film substrate is preferably used from the viewpoint of moisture retention and the like. As the release agent, commercially available release agents such as silicone release agents, fluorine release agents, and long chain alkyl release agents can be used.
In the present embodiment, the base material sheet 15 is provided with a separation guide line 15a along an annular line that divides the non-adhesive dividing portion 12 and the adhesive annular dividing portion 13 of the curing sheet body 14 of the curing sheet 11. For example, the separation guide line 15a can be easily formed by cutting, half-cutting, or pin-hole cutting only the base material sheet 15 along a preferably rectangular annular line that divides the non-adhesive dividing portion 12 and the adhesive annular dividing portion 13 in a state where the base material sheet 15 is bonded to the back surface side of the curing sheet main body 14. Since the inner portion 15b surrounded by the separation guide line 15a and overlapping the working surface 55a of the repair mortar 55 can be easily separated from the outer portion 15c thereof by forming the separation guide line 15a, when the curing sheet 11 is adhered to the front surface 50a of the existing concrete column 50 while covering the working surface 55a, the curing sheet 11 can be easily formed on the back surface side thereof: a non-adhesive dividing section 12 overlapping the processing surface 55a of the repair mortar 55; and an adhesive ring-shaped dividing portion 13 having a width of, for example, about 20 to 300mm, which is preferably continuously provided in a rectangular ring shape at an outer peripheral portion of the non-adhesive dividing portion 12.
According to the present embodiment, the repaired portion maintenance structure 10 of the concrete surface can be formed by filling the repair mortar 55 into the repair recess 52 formed by drilling the repair area including the damaged portion 51 caused by the crack or the like generated on the surface of the concrete column 50, covering the processed surface 55a of the filled repair mortar 55, and bonding the maintenance sheet 11 to the surface 50a of the existing concrete column 50. That is, in the present embodiment, the outer portion 15c of the base material sheet 15 is peeled and removed from the back surface of the curing sheet main body 14 while keeping the inner portion 15b thereof along the separation guide line 15a of the base material sheet 15, and thereby: a non-adhesive dividing portion 12 based on the remaining inner portion 15b of the base material sheet 15; and the adhesive ring-shaped dividing portions 13 formed by the removed outer portion 15c, the adhesive ring-shaped dividing portions 13 are adhered to the outer region of the surface of the existing concrete column 50 surrounding the working surface 55a of the repair mortar 55 in a state where the formed non-adhesive dividing portions 12 are overlapped with the entire working surface 55a of the repair mortar 55, so that the curing sheet 11 can be attached so as to cover the working surface 55a of the repair mortar 55, thereby easily forming the repair site curing structure 10.
Accordingly, by bonding the adhesive ring-shaped dividing portion 13 to the region surrounding the outer side of the processed surface 55a of the repair mortar 55, it is possible to prevent moisture from volatilizing from the filled repair mortar 55, and it is possible to perform curing effectively in a state where the repair mortar 55 is covered with the curing sheet 11 for a predetermined time.
After a predetermined curing time has elapsed, the repair mortar 55 filled in the repair recess 52 is cured, and after a time required for curing, the curing sheet 11 is removed from the surface of the concrete column 50. Here, since the working surface 55a of the filled repair mortar 55 is covered with the non-adhesive dividing portion 12, when the curing sheet 11 is peeled off and removed, it is possible to effectively prevent the curing sheet 11 from being peeled off from the working surface 55a in a state where a part of the repair mortar 55 adheres thereto, or the curing sheet 11 from being peeled off in a state where an adhesive remains adhering to the working surface 55 a.
Thus, according to the present embodiment, the repair mortar 55 filled in the repair recess 52 for repairing the damaged portion 51 generated on the surface of the existing concrete column 50 can be cured efficiently without volatilizing moisture, and the curing can be performed easily and easily without roughening the processed surface 55a formed by the cured repair mortar 55.
Fig. 3(a) to (c) illustrate another embodiment of the curing sheet 11' used in the repair site curing structure 10 for a concrete surface according to the present embodiment. Another embodiment of the curing sheet 11' shown in fig. 3(a) to (c) includes: a curing sheet main body 14 having non-permeability and coated with an adhesive on the entire back surface side; and a base material sheet 15 'that is overlapped with the back surface side of the curing sheet main body 14 on which the adhesive is applied and is bonded so as to be peelable, the base material sheet 15' being overlapped with and bonded to the back surface side of the curing sheet main body 14 in a state where the non-adhesive sheet 16 is interposed between the non-adhesive dividing section 12 on the back surface side of the curing sheet main body 14. When the base material sheet 15 'is peeled and removed from the back surface of the curing sheet body 14 while the non-adhesive sheet 16 is left adhered to the surface of the concrete column 50 which is an existing concrete structure, the base material sheet 15' is formed on the back surface side of the curing sheet body 14: a non-adhesive dividing section 12 based on the left non-adhesive sheet 16; and an adhesive ring-shaped dividing portion 13 based on the outer portion thereof.
In the curing sheet 11' of the other embodiment shown in fig. 3(a) to (c), the same components as those of the curing sheet 11 shown in fig. 2(a) to (c) are denoted by the same reference numerals, and the description thereof is omitted. The descriptions of the curing sheet 11 in fig. 2(a) to (c) can be applied to portions not specifically described.
In the curing sheet 11' of another embodiment shown in fig. 3(a) to (c), the non-adhesive sheet 16 sandwiched between the non-adhesive dividing section 12 on the back surface side of the curing sheet main body 14 includes, for example, a sheet made of a polyester film, a polypropylene film, a polyethylene film, or the like, a sheet made of paper such as fine paper, impregnated paper, flat paper, or the like, or a sheet made of a foamed base material such as a polyurethane foam, a polyethylene foam, a polypropylene foam, or the like. Among them, a film material is preferably used from the viewpoint of moisture retention and the like. In addition, from the viewpoint of heat retaining property, a sheet material in which a film and a foam are combined is preferably used. That is, the non-adhesive sheet is preferably made of a heat insulating sheet. The non-adhesive sheet 16 can be easily adhered to the non-adhesive dividing portion 12 on the back surface side of the curing sheet main body 14 by the adhesive applied to the curing sheet main body 14.
In the curing sheet 11 'of the other embodiment shown in fig. 3(a) to (c), the base material sheet 15' is formed in a rectangular shape larger than the curing sheet main body 14, and it is not necessary to separate the guide lines. The base material sheet 15 'is integrally bonded to the curing sheet body 14 at the portion of the adhesive ring-shaped dividing portion 13 on the outer periphery of the back surface side of the curing sheet body 14, thereby forming the curing sheet 11' together with the curing sheet body 14. When the curing sheet 11 'is adhered to the surface of the concrete column 50 so as to cover the processed surface 55a of the repair mortar 55, the entire base material sheet 15' is removed from the back surface of the curing sheet main body 14. In fig. 2(c) and 3(c), the base material sheets 15 and 15' are shown by broken lines except for the back surface of the curing sheet body 14.
Even when the curing sheet 11 ' of the other embodiment shown in fig. 3(a) to (c) is used, the base material sheet 15 ' is peeled and removed from the back surface of the curing sheet body 14 in a state where the non-adhesive sheet 16 remains when adhering to the surface of the concrete column 50, and thereby the curing sheet 11 ' is formed on the back surface side of the curing sheet body 14: a non-adhesive dividing section 12 based on the left non-adhesive sheet 16; and the adhesive ring-shaped dividing portion 13 based on the outer portion thereof, the adhesive ring-shaped dividing portion 13 is adhered to the area surrounding the outer side of the processed surface 55a of the repair mortar 55 on the surface of the existing concrete column 50 in a state where the formed non-adhesive dividing portion 12 is overlapped with the entire processed surface 55a of the repair mortar 55, whereby the curing sheet 11 'can be attached so as to cover the processed surface 55a of the repair mortar 55, and the same operational effects as those in the case of using the curing sheet 11' shown in fig. 2(a) to (c) are exhibited.
In addition, when the non-adhesive sheet 16 provided on the back surface side of the curing sheet main body 14 is a heat insulating sheet, for example, even in a low temperature environment in winter, it is possible to prevent dissipation of heat generated at the initial curing of the repair mortar 55 and to exhibit appropriate strength.
Fig. 4(a) to (c) also illustrate another embodiment of the curing sheet 11 ″ used in the repair site curing structure 10 for a concrete surface according to the present embodiment. Another maintenance sheet 11 ″ shown in fig. 4(a) to (b) includes: the curing sheet comprises a curing sheet main body 14 ' which is air-impermeable and coated with an adhesive on the back side thereof, and a base sheet 15 which is overlapped with the back side of the curing sheet main body 14 ' coated with the adhesive and bonded in a peelable manner, wherein the adhesive is not coated on the non-adhesive dividing sections 12 but only on the adhesive ring-shaped dividing sections 13 which are continuously provided in a ring shape at the outer peripheral portions of the non-adhesive dividing sections 12 on the back side of the curing sheet main body 14 '. When the base material sheet 15 "is peeled and removed from the back surface of the curing sheet body 14" when it is bonded to the surface of the concrete column 50, which is an existing concrete structure, the following are formed on the back surface side of the curing sheet body 14 ": a non-adhesive partition 12 not coated with an adhesive; and an adhesive ring-shaped dividing portion 13 coated with an adhesive.
Even in the case of using the curing sheet 11 ″ of the other embodiment shown in FIGS. 4(a) to (c), also, when the base material sheet 15 "is peeled off from the back surface of the curing sheet body 14" and removed when adhered to the surface of the concrete column 50, thereby forming a non-adhesive dividing portion 12 and an adhesive ring-shaped dividing portion 13 based on the outer portion thereof on the back side of the curing sheet main body 14 ", therefore, by bonding the adhesive ring-shaped dividing section 13 to the area surrounding the outer side of the processed surface 55a of the repair mortar 55 on the surface of the existing concrete column 50 in a state where the formed non-adhesive dividing section 12 is overlapped with the entire processed surface 55a of the repair mortar 55, thus, the curing sheet 11 ″ is attached so as to cover the processed surface 55a of the repair mortar 55, and the same effects as those in the case of using the curing sheet 11 shown in fig. 2(a) to (c) are obtained.
Fig. 5(a) also illustrates another embodiment of the curing sheet 11a used in the repair site curing structure 10 for a concrete surface according to the present embodiment. Another curing sheet 11a of the embodiment shown in fig. 5(a) includes: a curing sheet main body 14a having non-permeability and coated with an adhesive on the back side; and a pair of end curing sheets 17 having non-permeability and coated with an adhesive on the back surface side, wherein the curing sheet main body 14a is cut into a rectangular shape, and the adhesive is coated on the back surface side of each side edge portion 14b provided along a pair of opposing side edges, so that a non-adhesive partition 12 is formed in a region sandwiched by the side edge portions 14b coated with the adhesive, and the adhesive is coated on the entire back surface side of the end curing sheets 17. When the curing sheet 17 is adhered to the surface of the concrete column 50, which is a conventional concrete structure, by overlapping the side edge portions 14c provided along the other pair of opposing side edges of the rectangular curing sheet body 14 and adhering the end curing sheet 17 in a state of being exposed to the outside of the other pair of opposing side edges, the adhesive ring-shaped dividing portions 13 are formed continuously in a ring shape on the outer peripheral portions of the non-adhesive dividing portions 12 of the curing sheet body 14 by the portions of the end curing sheet 17 exposed to the outside of the other pair of opposing side edges and the side edge portions 14b on both sides provided along the pair of opposing side edges of the curing sheet body 14.
In the curing sheet 11a shown in fig. 5(a), the curing sheet main body 14a is preferably cut out in a rectangular shape by being separated along, for example, a separation line 18a from the curing sheet main body roll 18 shown in fig. 5(b), and the curing sheet main body roll 18 is preferably wound in a roll shape with the adhesive-coated side edge portions 14b disposed on both sides in the width direction.
Even in the case of using the curing sheet 11a of the other embodiment shown in fig. 5(a), since the non-adhesive dividing portions 12 by the curing sheet main body 14a and the adhesive ring-shaped dividing portions 13 by the side edge portions 14b of the curing sheet main body 14a and the end curing sheets 17 are formed on the back sides of the curing sheet main body 14a and the end curing sheets 17, therefore, by bonding the adhesive ring-shaped dividing section 13 to the area surrounding the outer side of the processed surface 55a of the repair mortar 55 on the surface of the existing concrete column 50 in a state where the formed non-adhesive dividing section 12 is overlapped with the entire processed surface 55a of the repair mortar 55, accordingly, the curing sheet 11a can be attached so as to cover the processed surface 55a of the repair mortar 55, and the same effects as those in the case of using the curing sheet 11 shown in fig. 2(a) to (c) can be obtained.
The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, even when the curing sheet of the embodiment shown in fig. 2(a) and (b) is used, the curing sheet can be attached so as to cover the processed surface of the cement-based curing material with the heat insulating sheet sandwiched between the processed surface of the cement-based curing material and the non-adhesive dividing portion by sandwiching the heat insulating sheet between the curing sheet main body and the base material sheet in the non-adhesive dividing portion. The repaired portion of the concrete surface may be the surface of various concrete structures other than the concrete column. The base material sheet and the non-adhesive dividing portion do not necessarily have a rectangular planar shape, and may have various other planar shapes such as a circular shape corresponding to the shape of the repair recess. The existing concrete structure to be repaired includes a newly installed concrete structure which has just been demolded. Therefore, the repair recess filled with the cement-based cured material cured by the repair site cured structure and the curing sheet of the present invention is not necessarily a repair recess formed by chiseling out a damaged portion caused by a crack or the like generated in the concrete structure due to aged deterioration or the like, and may be a repair recess caused by a construction failure portion such as a pitted surface or the like generated when a concrete structure is newly installed, or may be a repair recess of a portion where a core is pulled out or a portion where a nondestructive inspection is performed in order to inspect concrete. In addition, when a temporary material such as a cutting beam is added to perform construction on the premise of local repair, a recess for repair may be formed and used when surface finishing is performed in which the cutting beam is disassembled and cut to secure a protective layer thickness of a cut surface.
Industrial applicability
According to the repair part maintenance structure for a concrete surface or the maintenance sheet for the maintenance structure of the present invention, the cement-based curing material filled in the repair recess for repairing the damaged part occurring on the surface of the existing concrete structure can be effectively maintained without volatilizing water, and the maintenance can be easily and easily performed without roughening the processed surface of the cured cement-based curing material.
Claims (10)
1. A repaired portion maintenance structure of a concrete surface, which is maintained so as not to volatilize water from a cement-based curing material filled in a repair recess formed in a repair area including a damaged portion generated on a surface of an existing concrete structure, wherein,
the repair part maintenance structure is formed by bonding a maintenance sheet material to the surface of an existing concrete structure so as to cover the processed surface of the cement-based curing material filled in the repair recess,
the curing sheet is formed in the following manner: a non-adhesive section and an adhesive ring-shaped section, the non-adhesive section being superimposed on the working surface of the cement-based curing material and on a region surrounding the entire working surface, the adhesive ring-shaped section being provided continuously in a ring shape on an outer peripheral portion of the non-adhesive section on a back surface side to be bonded to a front surface of an existing concrete structure,
the curing sheet is attached so as to cover the processed surface of the cement-based curing material by bonding the adhesive ring-shaped partition to a region surrounding the outside of the processed surface of the existing concrete structure in a state where the non-adhesive partition is overlapped with the entire processed surface.
2. The structure for maintaining a repaired area on a concrete surface according to claim 1, wherein the maintenance sheet is attached so as to cover the processed surface of the cement-based curing material in a state where a heat insulating sheet is interposed between the processed surface of the cement-based curing material and the non-adhesive dividing portion.
3. A curing sheet for use in a repair site curing structure for a concrete surface according to claim 1 or 2,
the curing sheet comprises: a curing sheet main body having non-permeability and coated with an adhesive on the entire back surface side; and a base material sheet which is overlapped with the back side of the curing sheet main body coated with the adhesive and is bonded with the curing sheet main body in a stripping way,
a separation guide line is provided on the base material sheet along an annular line that divides the non-adhesive dividing portion and the adhesive annular dividing portion,
when the base material sheet is bonded to the surface of the existing concrete structure, the base material sheet of the outer portion of the separation guide line is separated while the inner portion of the separation guide line remains, and the separated outer portion is peeled off and removed from the back surface of the curing sheet main body, thereby forming on the back surface side of the curing sheet main body: the non-adhesive dividing portion based on the remaining inner portion of the base material sheet; and the adhesive ring-shaped dividing portion based on the removed outer portion.
4. A curing sheet for use in a repair site curing structure for a concrete surface according to claim 1 or 2,
the curing sheet comprises: a curing sheet main body having non-permeability and coated with an adhesive on the entire back surface side; and a base material sheet which is overlapped with the back side of the curing sheet main body coated with the adhesive and is bonded with the curing sheet main body in a stripping way,
the base material sheet is overlapped and bonded to the back surface side of the curing sheet main body in a state where a non-adhesive sheet is sandwiched between the non-adhesive dividing portion and the back surface side of the curing sheet main body,
when the base material sheet is bonded to the surface of an existing concrete structure, the base material sheet is peeled and removed from the back surface of the curing sheet main body in a state where the non-adhesive sheet remains, and thereby: the non-adhesive dividing portion based on the non-adhesive sheet that is left; and the adhesive ring-shaped dividing portion based on the outer portion thereof.
5. The curing sheet of claim 4, wherein the non-tacky sheet is made of a thermal insulating sheet.
6. A curing sheet for use in a repair site curing structure for a concrete surface according to claim 1 or 2,
the curing sheet comprises: a curing sheet main body having non-permeability and coated with an adhesive on the back side; and a base material sheet which is overlapped with the back side of the curing sheet main body coated with the adhesive and is bonded with the curing sheet main body in a stripping way,
on the back side of the curing sheet main body, an adhesive is not applied to the non-adhesive dividing portions but only to the adhesive ring-shaped dividing portions which are continuously provided in a ring shape at the outer peripheral portions of the non-adhesive dividing portions,
when the base material sheet is bonded to the surface of an existing concrete structure, the base material sheet is peeled off and removed from the back surface of the curing sheet main body, and thereby: the non-adhesive dividing portion not coated with an adhesive; and the adhesive ring-shaped dividing portion coated with an adhesive.
7. The curing sheet as claimed in any one of claims 3 to 6, wherein the base material sheet and the non-adhesive dividing portion have a rectangular planar shape, and the adhesive ring-shaped dividing portion has a rectangular ring-shaped planar shape.
8. A curing sheet for use in a repair site curing structure for a concrete surface according to claim 1 or 2,
the curing sheet comprises: a curing sheet main body having non-permeability and coated with an adhesive on the back side; and a pair of end curing sheets having non-permeability and coated with adhesive on the back side,
the curing sheet body is cut into a rectangular shape, and the non-adhesive dividing portions are formed by applying an adhesive to the back side of each side edge portion provided along a pair of opposing side edges so that the region sandwiched by these side edge portions applied with the adhesive is sandwiched, the end curing sheet being applied with the adhesive over the entire back side,
when the curing sheet is bonded to the surface of an existing concrete structure, the curing sheet is overlapped with the side edge portions provided along the other pair of opposing side edges of the rectangular curing sheet body, and the end curing sheets are bonded in a state of being exposed to the outside of the other pair of opposing side edges, whereby the adhesive ring-shaped dividing portion is formed in a ring-shaped continuous manner on the outer peripheral portion of the non-adhesive dividing portion of the curing sheet body by the exposed portion of the end curing sheet to the outside of the other pair of opposing side edges and the side edge portions on both sides provided along the pair of opposing side edges of the curing sheet body.
9. The maintenance sheet as claimed in claim 8, wherein the maintenance sheet main body is cut out in a rectangular shape from a maintenance sheet main body roll, and the maintenance sheet main body roll is wound in a roll shape with side edge portions coated with an adhesive being disposed on both sides in a width direction.
10. The curing sheet according to any one of claims 3 to 9, wherein the adhesive applied to the back surface side of the curing sheet main body or the end curing sheet has an adhesive force of 2 to 15N/25 mm.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-143714 | 2019-08-05 | ||
| JP2019143714A JP7248537B2 (en) | 2019-08-05 | 2019-08-05 | Concrete surface repair part curing structure and curing sheet |
| PCT/JP2020/029880 WO2021025029A1 (en) | 2019-08-05 | 2020-08-04 | Structure for curing repaired part on concrete surface and curing sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114207232A true CN114207232A (en) | 2022-03-18 |
Family
ID=74503023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080055706.1A Pending CN114207232A (en) | 2019-08-05 | 2020-08-04 | Maintenance structure and maintenance sheet for repaired part of concrete surface |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7248537B2 (en) |
| CN (1) | CN114207232A (en) |
| WO (1) | WO2021025029A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2021025029A1 (en) | 2021-02-11 |
| JP7248537B2 (en) | 2023-03-29 |
| JP2021025295A (en) | 2021-02-22 |
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