JP2023070124A - Structure protective sheet and structure surface protection method - Google Patents

Abstract

To provide a structure protective sheet that can protect the surface of a column, a wall, a structure having unevenness, and the surface of a structure provided on a water area for a long period of time, and that can be quickly and easily constructed even underwater or on a waterfront.SOLUTION: A structure protective sheet comprising a polymer cement hardened layer, and a resin layer provided on the polymer cement hardened layer includes: a bank-shaped spacer part along an edge of the surface on the polymer cement hardened layer side; and an opening in a part of the spacer part.SELECTED DRAWING: Figure 1

Description

The present invention provides a structure protection sheet used for protecting the surfaces of columns, walls, structures with unevenness, the surfaces of structures provided on water areas, especially the surfaces near the water's edge, and the structure protection. The present invention relates to a surface protection method for structures using a sheet. More particularly, the present invention relates to a structure protection sheet which is more weather resistant than conventional ones and which can be worked extremely efficiently even in water or at the water's edge, and a structure protection method using the structure protection sheet.

Structures built over bodies of water such as rivers, seas and lakes, such as bridge piers, harbor quays, water gates and other river management facilities, water supply and sewage culverts and other water concrete structures, etc. Seawater) is particularly prone to corrosion near the waterline, and if erosion is left untreated, the risk of collapse of the structure increases, so it is necessary to repair corroded parts periodically.

As a surface protection method for a structure provided on a water area, for example, a method of forming a dry area around a portion to be repaired as described in Patent Document 1 is known.
However, the method of forming a dry area requires a large-scale construction work, so that the construction period is extremely long and the cost is high.

As a quicker and easier method of protecting the surface of a structure, for example, a method called SPC method (steel pipe pile PC coating anti-corrosion method) is known. This SPC construction method is a method in which steel pipe piles used for port facilities are covered with discarded molds made of polycarbonate resin, and a rust inhibitor is injected into the gap between the steel pipe piles and the formwork to protect the surface of the steel pipe piles with the formwork. .
However, the period during which the surface of structures can be protected by the SPC method is about several years to less than 10 years, and there is a need for a structure protection sheet and a structure surface protection method that can be applied more easily and that can be protected for a longer period of time. had been

Japanese Patent Application Laid-Open No. 2020-143489

The present invention has been made in view of such a conventional situation, and its purpose is to protect the surface of a structure with columns, walls, unevenness, and the surface of a structure provided on a water area for a long time. To provide a structure protection sheet and a method for protecting the surface of a structure, which can be applied quickly and easily even in water and at the water's edge.

The present inventors have studied a structure protection sheet that is used to protect the surfaces of concrete columns and walls, the surfaces of structures with unevenness, and structures provided over bodies of water. Concretely, conformability that can follow cracks and expansion that occurred in concrete, waterproofness that prevents deterioration factors such as water and chloride ions from penetrating into concrete, salt barrier, and neutrality. In addition to anti-oxidation properties, a layer is provided to ensure the strength of the protective sheet itself, and a bank-like spacer part that can form a space to be filled with an adhesive when attached to the surface of a structure is provided. We realized this and completed the present invention. This technical idea can be particularly suitably applied to structures on water bodies, but it can also be applied to columns and walls outside of water bodies, uneven surfaces of structures, and structures made of concrete or other materials. It can be applied as an applicable structure protection sheet and a structure surface protection method using the structure protection sheet.

(1) A structure protection sheet according to the present invention (hereinafter also referred to as a protection sheet according to the present invention) is a structure protection sheet comprising a polymer cement hardening layer and a resin layer provided on the polymer cement hardening layer. It is characterized by having a bank-like spacer section along the edge of the surface on the polymer cement hardened layer side and an opening in a part of the spacer section.

According to this invention, a space corresponding to the height of the spacer portion can be formed between the protective sheet and the structure by attaching the protective sheet from the side of the spacer portion to the surface of the structure, and the space is surrounded by the spacer portion. By filling the area with the adhesive, it is possible to protect the surface of the structure provided on the water area for a long period of time, and construction can be performed quickly and easily even in the water and at the water's edge.
Moreover, since the protective sheet according to the present invention is composed only of a layer that does not contain a base material or a reinforcing member, it can be easily attached to the surface of an existing concrete column. As a result, even an unskilled worker can stably install a protective sheet with excellent strength on the surface of a concrete pillar, etc., which greatly reduces the construction period and allows the concrete pillar, etc. to be maintained for a long period of time. can be protected.
The protective sheet has excellent adhesion to the concrete pillars of the polymer cement hardened layer provided on the side of the concrete pillars, etc., and the resin layer provided on the polymer cement hardened layer is waterproof and salt-blocking. It is possible to impart excellent properties such as properties and neutralization prevention properties.
In addition, since the above protective sheet can be mass-produced by the coating process and the drying process on the production line of the factory, according to the present invention, it is possible to reduce the cost, greatly reduce the work period at the site, and long-term protection of concrete columns. can do.

(2) In the present invention, the spacer portion comprises a water-resistant adhesive or a sheet comprising another polymer cement hardened layer and another resin layer provided on the other polymer cement hardened layer (1 ) is preferably a structure protection sheet described in ).

According to the present invention, even when the protective sheet according to the present invention is attached underwater or on the water's edge, the space formed using the spacer portion does not collapse until the adhesion is completed, and the protective sheet described above does not collapse. Good adhesion of the sheet to the surface of the structure can be maintained.

(3) In the present invention, the structure protection sheet has a polygonal shape, and the spacer portion is formed leaving one edge of the surface on the polymer cement hardened layer side (1) or (2). It is preferably the structure protection sheet described.

According to the present invention, a sufficient area of the surface of the polymer cement hardened layer to be adhered with the adhesive can be ensured, and good adhesion to the surface of the structure can be maintained, and the space described above is filled with the adhesive. Even if there is water contained inside, the water can be suitably discharged from the opening, so that construction can be efficiently and easily carried out underwater or at the water's edge.

(4) In the present invention, it is preferable that the structure protection sheet according to (1), (2) or (3) has a height of the spacer portion of 1.0 to 3.0 mm.

According to the present invention, a sufficient space can be formed between the protective sheet according to the present invention and the structure, so that the above-mentioned adhesive can be easily applied, and the adhesion when attached to the surface of the structure is improved. .

(5) In the present invention, the polymer cement hardening layer is a layer containing a cement component and a resin, and may contain 10% by weight or more and 40% by weight or less of the resin. More preferably, it is a structure protection sheet according to (1), (2), (3) or (4), in which the resin content is 20% by weight or more and 30% by weight or less.

According to the present invention, by controlling the ratio between the cement component and the resin component, it becomes easier to form the polymer cement hardened layer, and the polymer cement hardened layer tends to be a layer with excellent conformability and good compatibility. It tends to improve the adhesiveness of itself. Furthermore, the cement component contained in the polymer cement hardening layer on the side of the concrete structure acts to enhance the adhesion to concrete structures such as concrete.

(6) A structure surface protection method according to the present invention is a structure surface protection method using the structure protection sheet according to (1), (2), (3), (4) or (5). The surface on the polymer cement hardened layer side and the surface of the structure are arranged to face each other through the spacer portion of the structure protection sheet, and the structure is formed by the spacer portion, the structure protection sheet, and the structure. forming a space; filling the space with an adhesive; and curing the adhesive filled in the space to attach the structure protection sheet to the surface of the structure. characterized by

According to this invention, it is possible to quickly and easily apply a structure protection sheet to the surface of a structure placed above water, even underwater and at the water's edge, and long-term protection is possible. becomes.

(7) The present invention is the surface protection method for a structure according to (6), wherein the structure is provided over a water area, and the structure protection sheet is attached so as to cover the waterfront line of the structure. preferable.

According to this invention, the vicinity of the water's edge, which is most susceptible to erosion by water, can be protected by the structure protection sheet according to the invention.

ADVANTAGE OF THE INVENTION According to this invention, the structure protection sheet which can protect the surface of a structure for a long period of time, and the surface protection method of a structure using this structure protection sheet can be provided. In particular, structures installed above water areas are susceptible to water erosion and corrosion, especially at the water's edge. A structure protection sheet and a surface protection method for a structure using the structure protection sheet can be provided.
Furthermore, the structure protection sheet according to the present invention can impart extremely excellent weather resistance to the resin layer, so that it is possible to protect the surface of the structure for an extremely long period of time as compared with the conventional SPC construction method. Further, by imparting various functions to the resin layer or forming layers imparted with various functions on the resin layer, it is possible to impart performance according to the characteristics of the structure. .

(A) is a plan view showing an example of a structure protection sheet used in the present invention, and (B) is a cross-sectional view taken along the line AA shown in (A). (A) and (B) are partially enlarged cross-sectional views of a structure protection sheet according to the present invention. (A) is an explanatory view showing how the structure protection sheet according to the present invention is applied, and (B) is an explanatory view showing an example immediately after applying the structure protection sheet according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows typically an example of the sticking method of the structure using the structure protection sheet which concerns on this invention. (A) is a plan view showing another example of the structure protection sheet used in the present invention, and (B) is a cross-sectional view along the line BB shown in (A), showing These are explanatory views showing how the structure protection sheet according to the present invention shown in (A) and (B) is applied.

Hereinafter, the structure protection sheet according to the present invention will be described with reference to the drawings. The present invention can be modified in various ways as long as it has the technical features, and is not limited to the following description and drawings.

[Structure protection sheet]
As shown in FIGS. 2A and 2B, the structure protection sheet 1 according to the present invention comprises a hardened polymer cement layer 2 provided on the side of the structure, and a hardened polymer cement layer 2 provided on the hardened polymer cement layer 2. layer 3; Both the polymer cement hardening layer 2 and the resin layer 3 may be formed as a single layer or as a laminate. Another layer may be provided between the hardened polymer cement layer 2 and the resin layer 3 depending on the required performance.

As shown in FIGS. 1(A) and 1(B), the structure protection sheet 1 according to the present invention includes a bank-like spacer portion 5 along the edge of the surface on the polymer cement hardened layer 2 side, and a spacer portion It has an opening 6 in a part of 5 .

The structure protection sheet 1 according to the present invention preferably has a thickness distribution within ±100 μm. Since the structure protection sheet 1 has a thickness distribution within the above range, even an unskilled worker can stably form a layer with small thickness variations on the surface of the structure. Further, by controlling the thickness distribution within the above range, it becomes easier to uniformly reinforce the structure.
The hardened polymer cement layer 2 provided on the structure side is excellent in adhesion to the structure, and can also provide the property of ensuring strength. Moreover, the resin layer 3 provided on the polymer cement hardened layer 2 can impart properties such as waterproofness, salt barrier properties, and neutralization prevention properties.
In addition, since the structure protection sheet 1 can be mass-produced by the coating process and the drying process on the production line of the factory, it is possible to reduce the cost, significantly reduce the work period at the site, and achieve long-term protection of the structure. As a result, it is possible to greatly reduce the time required for attaching the film to the surface of the structure and to protect the structure for a long period of time.

Specific examples of each component will be described in detail below.

(Structure)
A structure is a mating member to which the structure protection sheet 1 according to the present invention is applied.
Examples of the structure include a structure made of concrete.
The concrete is generally obtained by placing and curing a cement composition containing at least a cementitious inorganic substance, an aggregate, an admixture and water. Such concrete is widely used as civil engineering structures such as road bridges, tunnels, water gates and other river management facilities, sewer pipes, harbor quays and the like. In the present invention, by applying the structure protection sheet 1 to a structure made of concrete, it is possible to follow the cracks and expansion that occur in the concrete, and to prevent deterioration factors such as water and chloride ions from penetrating into the concrete. There are advantages.

(polymer cement hardened layer)
The polymer cement hardening layer 2 is a layer arranged on the structure side via a spacer portion 5 which will be described later. The hardened polymer cement layer 2 may be, for example, a single layer without overcoating as shown in FIG. 2(A), or may be a laminated layer with overcoating as shown in FIG. 2(B). Whether to use a single layer or a laminate is arbitrarily set in consideration of the overall thickness, imparted functions (followability, adhesion to structures, etc.), factory production lines, production costs, etc. For example, the production line is too short to obtain a desired thickness with a single layer, two or more layers can be applied. For example, when two layers are overcoated, the second layer is formed after drying the first layer.
The hardened polymer cement layer 2 may also have a structure in which layers having different properties are laminated. For example, by forming a layer with a higher resin component ratio on the resin layer 3 side, the layer with a high resin component adheres to the resin layer, and the layer with a high cement component adheres to the structure. becomes extremely excellent.

The hardened polymer cement layer 2 is obtained by coating a resin containing a cement component (resin component) in the form of a coating.
Examples of the cement component include various cements, limestones containing calcium oxide, and clays containing silicon dioxide. Among them, cement is preferable, and examples thereof include portland cement, alumina cement, high-early strength cement, fly ash cement, and the like. Which cement is selected is selected according to the properties that the hardened polymer cement layer 2 should have, for example, considering the degree of conformability to the concrete structure. Portland cement defined in JIS R5210 is particularly preferred.

Examples of the resin component include acrylic resin, acrylic urethane resin, acrylic silicone resin, fluororesin, flexible epoxy resin, polybutadiene rubber, acrylic resin exhibiting rubber properties (e.g., synthetic rubber containing acrylic acid ester as a main component), etc. can be mentioned. Such a resin component is preferably the same as the resin component constituting the resin layer 3 to be described later, from the viewpoint of enhancing the adhesion between the polymer cement hardened layer 2 and the resin layer 3 .
Further, any of thermoplastic resin, thermosetting resin, and photosetting resin may be used as the resin component. The term "cured" in the polymer cement cured layer 2 does not mean that the resin component is limited to a resin that cures and polymerizes, such as a thermosetting resin or a photocurable resin. It is used in the sense that it is sufficient to use a material that hardens to a certain degree.

The content of the resin component is appropriately adjusted according to the material used, etc., but is preferably 10% by mass or more and 40% by mass or less with respect to the total amount of the cement component and the resin component. . If it is less than 10% by weight, the adhesion to the resin layer 3 tends to decrease and it becomes difficult to maintain the polymer cement hardening layer 2 as a layer. may be insufficient. From the above viewpoint, the content of the resin component is more preferably 15% by weight or more and 35% by weight or less, and more preferably 20% by weight or more and 30% by weight or less.

The paint for forming the hardened polymer cement layer 2 is a coating liquid obtained by mixing a cement component and a resin component with a solvent. The resin component is preferably an emulsion. For example, an acrylic emulsion is polymer fine particles obtained by emulsion polymerization of a monomer such as an acrylic ester using an emulsifier. An acrylic acid-based polymer emulsion obtained by polymerizing a mixture in water containing a surfactant is preferably used.
The content of the acrylic acid ester and the like constituting the acrylic emulsion is not particularly limited, but is selected within the range of 20 to 100% by mass. Further, the amount of the surfactant is also blended according to need, and the amount is not particularly limited, but the surfactant is blended to the extent that it forms an emulsion.

The hardened polymer cement layer 2 is formed by applying the coating solution onto a release sheet and then removing the solvent (preferably water) by drying. For example, a mixed composition of a cement component and an acrylic emulsion is used as a coating liquid to form the hardened polymer cement layer 2 . Although the resin layer 3 may be formed on the release sheet after forming the polymer cement hardened layer 2, the polymer cement hardened layer 2 is formed after the resin layer 3 is formed on the release sheet. may
Specifically, for example, a process paper as a release sheet is coated with a resin layer, and after drying, a coating liquid for polymer cement is applied and dried.
After that, a coating liquid for polymer cement is further applied to the surface and dried to obtain the structure protection sheet according to the present invention.
It is also possible to obtain the structure protection sheet according to the present invention by coating a resin layer on a process paper as a release sheet, applying a coating liquid for polymer cement after drying, and drying the whole. .

The thickness of the hardened polymer cement layer 2 is not particularly limited, and the type of use of the structure (road bridge, tunnel, river facilities such as water gates, civil engineering structures such as sewer pipes, harbor quays, etc.), degree of aging, shape, etc. Arbitrarily set by A specific thickness of the hardened polymer cement layer 2 can be, for example, in the range of 0.5 mm to 1.5 mm. As an example, when the thickness is 1 mm, the thickness variation is preferably within ±100 μm. Such a precise thickness cannot be achieved by on-site coating, but can be achieved by stably coating on a factory production line. Even if the thickness is greater than 1 mm, the thickness variation can be kept within ±100 μm. Moreover, when the thickness is less than 1 mm, the thickness variation can be further reduced.

Due to the presence of the cement component, this hardened polymer cement layer 2 is more easily permeable to water vapor than the resin layer 3 which will be described later. The water vapor transmission rate at this time is, for example, 20 to 60 g/m ² . It is about a day. Furthermore, the cement component has good compatibility with, for example, the cement component that constitutes concrete, and can be made to have excellent adhesion to the concrete surface. In addition, since the hardened polymer cement layer 2 has extensibility, it can follow changes in the concrete even if the structure 21 cracks or expands.

(Spacer part)
As shown in FIGS. 1(A) and 1(B), the structure protection sheet 1 according to the present invention includes a bank-like spacer portion 5 along the edge of the surface on the polymer cement hardened layer 2 side, and the spacer portion 5. A part of the portion 5 has an opening 6 .
In FIGS. 1A and 1B, the spacer portions 5 are formed on three of the four edges of the surface of the polymer cement-hardened layer 2, and the opening 6 is formed on the remaining one side. However, the opening 6 may be formed halfway along the remaining side of the polymer cement hardening layer 2 .

The spacer portion 5 is a member that comes into contact with the surface of the structure when the structure protection sheet 1 according to the present invention is attached to the surface of the structure. A space surrounded by spacers 5 is formed between 1 and the surface of the structure, and the space is filled with an adhesive to be described later to firmly adhere the structure protection sheet 1 to the surface of the structure. can be done.

The spacer portion 5 is preferably made of a water-resistant adhesive or a sheet comprising another polymer cement hardened layer and another resin layer provided on the other polymer cement hardened layer.
Since the spacer portion 5 is made of a water-resistant adhesive or the above-mentioned sheet, even when the structure protection sheet 1 according to the present invention is attached underwater or on the water's edge, the space formed using the spacer portion 5 can be maintained. does not collapse until the adhesion is completed, and the adhesion of the protective sheet to the surface of the structure can be maintained satisfactorily.

The water-resistant adhesive is not particularly limited, and conventionally known ones can be used.
In addition, the sheet has a configuration in which another polymer cement hardened layer and another resin layer are laminated, and the other polymer cement hardened layer and the other resin layer include the structure according to the present invention described above. Examples include a polymer cement hardened layer and a resin layer that constitute the protective sheet.
That is, the spacer portion 5 made of the above sheet is obtained by processing the structure protection sheet according to the present invention into the shape of the spacer portion 5 and providing it on the surface of the polymer cement hardened layer of the structure protection sheet according to the present invention. is mentioned.

Moreover, it is preferable that the structure protection sheet 1 according to the present invention has a polygonal shape, and the spacer portion 5 is formed leaving one side of the edge portion of the surface on the polymer cement hardened layer 2 side. The structure protection sheet 1 according to the present invention having such a structure can secure a sufficient area to be adhered with the adhesive on the surface of the polymer cement hardening layer 2, and can maintain good adhesion to the surface of the structure. Also, even if there is water contained inside when the space is filled with the above-mentioned adhesive, the water can be suitably discharged from the opening, so construction in water or at the waterfront is efficient and easy. can be done.
The term "polygonal shape" means that the structure protection sheet according to the present invention has a polygonal shape when viewed from above. For example, the structure protection sheet 1 shown in FIG. Although it is preferably rectangular as shown in , any other shape such as square, trapezoid, or rhombus may be used.
Moreover, when the structure protection sheet 1 is rectangular, as shown in FIGS. is formed.
When the structure protection sheet 1 according to the present invention configured as shown in FIG. 1(A) is attached to the waterfront portion of the structure, it is preferably attached so that the opening 6 is exposed above the water. Water is contained in the above-described space corresponding to the waterfront portion and the underwater portion. can be efficiently discharged from the opening 6.

In such a structure protection sheet 1 according to the present invention, the height of the spacer portion 5 is preferably 1.0 to 3.0 mm. If it is less than 1.0 mm, the space formed when it is attached to the surface of the structure may be blocked, and the structure protection sheet is sufficiently attached to the surface of the structure when the adhesive described later is filled. It may not adhere. In addition, the space provided may become too narrow to allow efficient filling of the adhesive. If the height of the spacer portion 5 exceeds 3.0 mm, there is a possibility that extra time will be required for the construction of the structure protection sheet and the adhesion between the structure and the structure will be reduced. A more preferable lower limit of the height of the spacer portion 5 is 1.5 mm, and a more preferable upper limit thereof is 2.5 mm.

Such a spacer portion 5 can be formed, for example, by applying the water-resistant adhesive described above to a predetermined location along the edge of the polymer cement hardening layer 2 .
Moreover, the present invention, like the structure protection sheet 10 shown in FIGS. A bank-shaped spacer portion 15 formed so as to divide the inside of the bank-shaped spacer portion 15 along the edge into a plurality of sections is formed, and a structure having an opening 16 in a part of these spacer portions 15 may be Although the spacer portions 15 shown in FIG. 5A are formed so as to be entirely integrated, a gap is formed between the spacer portions 15 along the edge and the spacer portions 15 formed inside. , may be formed independently.
Since the structure protection sheet 10 having the structure shown in FIGS. Even if it is an area, the space surrounded by the spacer part 15 and the opening part 16 can be ensured between the structure protection sheet 10 and the surface of the structure by the spacer part 15 . When the surface of the structure 210 or the structure 211 shown in FIGS. By adjusting the formation position of the spacer part 15, a space following the surface of the structure 210 or the structure 211 and the opening 16 are formed between the surface of the structure 210 or the structure 211 and the structure protection sheet 10. can also
Furthermore, the surface of the structure 212 shown in FIG. The protective sheet 10 can also be attached by forming spaces and openings 16 without conforming to the surface shape of the structure 212 .

(resin layer)
The resin layer 3 is a layer arranged on the side opposite to the structure and appearing on the surface. The resin layer 3 may be, for example, a single layer as shown in FIG. 2(A), or may be a laminate consisting of at least two layers as shown in FIG. 2(B). Whether to use a single layer or a laminated layer takes into consideration the overall thickness, the functions to be imparted (waterproofness, salt resistance, neutralization resistance, water vapor permeability, etc.), the length of the factory production line, the production cost, etc. For example, if the production line is short and a single layer does not have a predetermined thickness, two or more layers can be overcoated. In the case of overcoating, the second layer is applied after drying the first layer. The second layer is then dried.

The resin layer 3 has flexibility and can follow cracks and fissures that occur on the concrete surface of the concrete column, and is a resin layer that is excellent in waterproofness, salt resistance, neutralization resistance, and water vapor permeability. Obtained by applying a formable paint. Resins constituting the resin layer 3 include acrylic resins exhibiting rubber characteristics (for example, synthetic rubber containing acrylic acid ester as a main component), acrylic urethane resins, acrylic silicone resins, fluorine resins, flexible epoxy resins, polybutadiene rubbers, and the like. can be mentioned. This resin material is preferably the same as the resin component constituting the polymer cement hardening layer 2 described above. In particular, it is preferably a resin containing an elastic film-forming component such as rubber.

Among these, the acrylic resin exhibiting rubber properties is preferably composed of an aqueous emulsion of an acrylic rubber copolymer in terms of excellent safety and coatability. Incidentally, the proportion of the acrylic rubber copolymer in the emulsion is, for example, 30 to 70% by mass. An acrylic rubber copolymer emulsion is obtained, for example, by emulsion polymerization of monomers in the presence of a surfactant. Any of anionic, nonionic and cationic surfactants can be used.

The paint for forming the resin layer 3 is prepared by preparing a mixed coating liquid of a resin composition and a solvent, applying the coating liquid on a release sheet, and then removing the solvent by drying. Layer 3 is formed. The solvent may be water, an aqueous solvent, or an organic solvent such as xylene/mineral spirit. In Examples described later, a water-based solvent is used, and the resin layer 3 is made of an acrylic rubber composition. The order of the layers formed on the release sheet is not limited. may be in that order. However, it is preferable to form the resin layer 3 on the release sheet and then form the hardened polymer cement layer 2, as shown in the examples below.

The thickness of the resin layer 3 is arbitrarily set according to the type of use of the structure (presence or absence of erosion, etc.), the degree of aging, the shape, and the like. As an example, it is preferable that the thickness be within the range of 50 to 150 μm, and that the thickness variation be within ±50 μm. Thickness with such precision cannot be achieved by coating on site, and can be stably achieved on the production line of the factory.

Moreover, the resin layer 3 may contain a pigment from the viewpoint of enriching the color variations of the structure protection sheet 1 used in the present invention.
Moreover, the resin layer 3 may contain an inorganic substance. By containing an inorganic substance, the resin layer 3 can be imparted with scratch resistance. The inorganic material is not particularly limited, and examples thereof include conventionally known materials such as metal oxide particles such as silica, alumina, and titania.
Furthermore, the resin layer 3 may contain a known antifouling agent. The protective sheet used in the present invention is a structure that is provided over a water area, and is used particularly for surface protection near the water's edge, so the resin layer 3 is often contaminated, but it contains an antifouling agent. By doing so, it is possible to suitably prevent the protective sheet from being contaminated.
Moreover, the resin layer 3 may contain an additive capable of imparting various functions. Examples of such additives include cellulose nanofibers and the like.

(Other configurations)
The manufactured structure protection sheet 1 may be provided with a release sheet on the resin layer 3 side, for example. The release sheet can protect the surface of the structure protection sheet 1 during transportation to the construction site, for example. By adhering the structure protection sheet 1 with , and then peeling off the release sheet, the workability at the construction site is greatly improved. The release sheet may be a process paper used in the production process of the structure protection sheet 1, or may be affixed with a protective film such as a polyethylene terephthalate film.

The process paper used as the release sheet is not particularly limited in terms of its material, etc., as long as it is conventionally known and used in the manufacturing process. For example, laminated paper having an olefin resin layer such as polypropylene or polyethylene or a silicon-containing layer, like known process paper, can be preferably used. The thickness is not particularly limited, but it can be any thickness, for example, about 50 to 500 μm, as long as the thickness does not impede handling in terms of manufacturing and construction.

The structure protection sheet 1 described above can protect the surface of a structure over a long period of time. In particular, the structure protection sheet 1 should be provided with performance according to the characteristics of the structure so that it can follow cracks and expansions that occur in the structure, and to prevent deterioration factors such as water and chloride ions from permeating the structure. can do. Since such a structure protection sheet 1 can be manufactured in a factory, it is possible to mass-produce high-quality sheets with stable characteristics. As a result, it can be constructed without relying on the skills of craftsmen, shortening the construction period and reducing labor costs.
Furthermore, since the surface of the resin layer 3 can be given a design property, the structure protection sheet 1 can be attached to the surface of the structure to give a design property. The method for imparting design properties is not particularly limited, and examples include a method of providing an uneven shape by a known method and a method of imparting a design by printing.

A method for protecting a surface of a structure according to the present invention is a method for protecting a surface of a structure using the above-described structure protecting sheet according to the present invention, wherein the polymer cement hardens through the spacer portion of the structure protecting sheet. arranging the layer-side surface and the surface of the structure to face each other to form a space formed by the spacer portion, the structure protection sheet and the structure; filling the space with an adhesive; and a step of curing the adhesive filled in the space and attaching the structure protection sheet to the surface of the structure.

In the method for protecting a surface of a structure according to the present invention, the surface on the side of the hardened polymer cement layer and the surface of the structure are arranged to face each other through the spacer portion of the structure protection sheet according to the present invention, and the spacer portion and the There is a step of forming a space formed by the structure protection sheet and the structure.
In this step, for example, the structure protection sheets may be arranged to face each other in accordance with the shape of the structure. Then, the surface of the structure protection sheet 1 on the side of the spacer portion is wrapped around the surface of the structure 21 to bond the structure protection sheet 1 to the surface of the structure 21 .

In the structure surface protection method according to the present invention, the structure 21 is provided on a water area, and as shown in FIG. It is preferable to affix the
A structure provided on a water area is most likely to be eroded by water in the vicinity of the water's edge. 21 surface protection becomes possible.

Moreover, since the spacer portion 5 is made of the water-resistant adhesive or the like described above, the structure protection sheet 1 can be attached to the structure by winding the spacer portion 5 of the structure protection sheet 1 in contact with the surface of the structure 21 . 21 surface, and a space formed by the spacer portion 5, the structure protection sheet 1 and the structure 21 can be formed.
An opening is formed in part of the space.

A surface protection method for a structure according to the present invention has a step of filling the space with an adhesive.
The adhesive is preferably a water-resistant adhesive, and specific examples thereof include "Konishi Bond E2300JW" manufactured by Konishi Co., Ltd., and the like.

Examples of the method of filling the adhesive include a method of pouring the adhesive into the space through the opening, and a method of injecting the adhesive from a spacer portion facing the opening using an adhesive injection jig such as a glue gun. etc. The method of pouring from the opening is a simple means, but the filling of the adhesive may be insufficient when the space is large or narrow. On the other hand, the method using an injection jig can reliably fill the adhesive into the space.

The structure surface protection method according to the present invention includes the step of curing the adhesive filled in the space and attaching the structure protection sheet to the surface of the structure.
By carrying out this step, the structure protection sheet 1 according to the present invention can be attached to the surface of the structure 21, and the surface of the structure 21 can be protected.

Until the adhesive is hardened, it is preferable to keep pressing the structure protection sheet 1 with the fixture 31 as shown in FIG. 3(B) in order to prevent the structure protection sheet 1 from peeling.
As the fixture 31, in the case of the columnar structure 21 as shown in FIG.

Moreover, depending on the size of the structure 21, it is preferable to divide the structure protection sheet 1 into a plurality of pieces and attach the structure protection sheet 1 to cover the surface of the structure 21 using the structure protection sheet 1. FIG. It is possible to prevent a single structure protection sheet from becoming large and heavy and reducing workability.
FIG. 4 shows a state in which the periphery of the structure 21 is divided into four and four structure protection sheets 1 are attached to the periphery of the structure 21 with an adhesive 40 .
In the case of a larger structure, it may be further divided and the surface may be protected with a structure protection sheet.
In FIG. 4, the adjacent structure protection sheets are attached to the surface of the structure 21 so as to be arranged side by side. It is preferable that the structure protective sheets are attached to the surface of the structure in a state where they overlap each other beyond the spacer portion 5 of 1 . Weather resistance to the structure 21 can be made more excellent.

EXAMPLES The present invention will be described more specifically by way of examples.

(Example 1)
A release sheet made of PP laminated paper and having a thickness of 130 μm was prepared, and a resin layer was formed on the release sheet by the following method.
First, an emulsion composition containing 60 parts by mass of acrylic silicone resin, 25 parts by mass of titanium dioxide, 10 parts by mass of ferric oxide, and 5 parts by mass of carbon black was prepared. After the emulsion composition was applied onto the release sheet, it was cured by heat treatment to form a resin layer. The thickness of the resin layer was set to 0.1 mm.
Next, a polymer cement hardening layer was formed on the resin layer.
Specifically, a water-based acrylic emulsion containing 45 parts by mass of a cement mixture was prepared as a composition for forming a polymer cement layer. Here, the cement mixture contains at least 70 ± 5 parts by mass of Portland cement, 10 ± 5 parts by mass of silicon dioxide, 2 ± 1 parts by mass of aluminum oxide, and 1 to 2 parts by mass of titanium oxide. It contains at least 53±2 parts by mass of an acrylic polymer obtained by emulsion polymerization using an acid ester monomer as an emulsifier and 43±2 parts by mass of water. The polymer cement layer obtained by coating and drying the polymer cement layer-forming composition in which these are mixed is a composite layer containing 50% by mass of Portland cement in the acrylic resin.
The above composition for forming a hardened polymer cement layer was applied on the resin layer and dried to form a single hardened polymer cement layer having a thickness of 1.29 mm.
A sheet having a total thickness of 1.39 mm was thus produced. This sheet was continuously produced in a factory controlled at about 25° C., and wound into a roll with a release sheet made of polyethylene terephthalate film included on the surface of the resin layer.

Next, at the construction site, a required portion was unwound from the roll-shaped sheet to prepare a square sheet, and spacer portions were formed on three sides of the surface on the polymer cement hardened layer side to prepare a protective sheet. For the spacer portion, a sheet is prepared by using the above-described polymer cement hardened layer and resin layer as another polymer cement hardened layer and another resin layer, and the sheet is cut into a long rectangle and applied to the surface of the structure. The height of the gap formed when sticking was set to 1.0 mm.

<Affixing to structures>
On the surface of a cylindrical steel pipe pile, on the part 1 meter above and below from near the sea surface (waterfront), the protective sheet according to the example was wound so as to completely wrap around the steel pipe pile, and fixed using a general-purpose fixing band. . Note that the fixation was carried out with the side where the spacer portion was not provided facing upward. The upper end of the protective sheet was open by the thickness of the spacer.
Thereafter, Konishi's "Konishi Bond E2300JW" was injected as an adhesive between the steel pipe pile and the protective sheet through the opening and left for 24 hours. After confirming that the adhesive had hardened, the fixing band was removed.
As a result, the protective sheet could be quickly and easily installed on the surface of the steel pipe pile near the sea surface. Moreover, since the protective sheet has excellent weather resistance, it can protect the surface of the steel pipe pile for a long period of time.

Reference Signs List 1, 10 Structure protection sheets 2, 12 Polymer cement hardened layer 3 Resin layers 5, 15 Spacers 6, 16 Openings 21, 210, 211, 212 Structure 30 Waterfront 31 Fixture 40 Adhesive

Claims (7)

A structure protection sheet comprising a polymer cement hardened layer and a resin layer provided on the polymer cement hardened layer,
A structure protection sheet comprising: a bank-like spacer section along the edge of the surface on the polymer cement hardened layer side; and an opening in a part of the spacer section. 2. The structure protection sheet according to claim 1, wherein said spacer portion comprises a water resistant adhesive or a sheet comprising another polymer cement hardened layer and another resin layer provided on said another polymer cement hardened layer. . 3. The structure protection sheet according to claim 1, wherein the structure protection sheet has a polygonal shape, and the spacer portion is formed leaving one side of the edge portion of the surface on the polymer cement hardened layer side. 3. The structure protection sheet according to claim 1, wherein the height of said spacer portion is 1.0 to 3.0 mm. 3. The structure protection sheet according to claim 1, wherein said polymer cement hardening layer is a layer containing a cement component and a resin, and said resin is contained in an amount of 10% by weight or more and 40% by weight or less. A surface protection method for a structure using the structure protection sheet according to claim 1 or 2,
A space formed by the spacer portion, the structure protection sheet and the structure is formed by arranging the polymer cement hardened layer side surface and the surface of the structure to face each other through the spacer portion of the structure protection sheet. the process of
filling the space with an adhesive; and
A surface protection method for a structure, comprising the step of curing the adhesive filled in the space and attaching the structure protection sheet to the surface of the structure. 7. The method of protecting a surface of a structure according to claim 6, wherein the structure is provided on a water area, and the structure protection sheet is attached so as to cover the water's edge of the structure.

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