Construction method of the structure

Abstract

To facilitate control of the coating thickness of paint applied between a structure and a temporary member.SOLUTION: A structure with a temporary member is characterized such that the structure includes a first surface and formed of a cement composition, the temporary member includes a second surface facing the first surface and formed of a cement composition, and a water-based type paint is applied between the first surface and the second surface.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a structure This relates to the construction method. [Background technology]

[0002] Construction work may be carried out by pouring a cement composition that will serve as a temporary material onto the surface of the cement composition of the structure. In order to maintain the integrity of the structure and the temporary material and to carry out construction work while applying stress to both the structure and the temporary material, a certain level of adhesive strength is required at the joint surface between the structure and the temporary material. However, if the adhesive strength at the joint surface between the structure and the temporary material is too strong, it will then be difficult to remove the temporary material from the structure.

[0003] As mentioned above, maintaining the integrity of the structure and temporary materials and making it easy to remove the temporary materials from the structure are conflicting requirements. One technique that can meet these conflicting requirements is to apply an oil-based coating such as paint or grease to the joint between the structure and temporary materials. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 7-217365 [Patent Document 2] Japanese Patent Application Publication No. 3-183896 [Patent Document 3] Japanese Patent Application Laid-Open No. 2014-80753 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the case of oil-based coatings such as paint and grease, the oil in the coating penetrates into the cement composition, making it difficult to control the coating thickness. If the oil in the coating penetrates into the cement composition and the coating thickness becomes thin, it can become difficult to remove the temporary material from the structure. On the other hand, if the coating thickness is made too thick in anticipation of the oil in the coating penetrating into the cement composition, the integrity of the structure and the temporary material can be impaired.

[0006] Some embodiments of the present invention aim to make it easier to control the thickness of paint applied between a structure and a temporary material. [Means for solving the problem]

[0008] Furthermore, some embodiments of the present invention include a structure formed from the cement composition and a temporary material formed from the cement composition. (However, this does not include sealants that prevent the leakage of hardening resins such as epoxy resins injected onto concrete surfaces that have been coated with a water-based primer.) and water-based paint; applying the water-based paint to the surface of the structure; attaching the temporary material to the surface of the structure to which the water-based paint has been applied; and removing the temporary material and the water-based paint from the structure.

[0009] Other features of the present invention will become apparent from the following description and drawings. [Effects of the Invention]

[0010] According to some embodiments of the present invention, it is possible to easily control the thickness of the paint applied between the structural body and the temporary material. [Brief explanation of the drawings]

[0011] [Figure 1] 1A to 1D are explanatory diagrams showing a construction method for a structure 10 of this embodiment. [Figure 2] 2A to 2D are explanatory diagrams showing a construction method for the structure 10 of the first comparative example. [Figure 3]3A to 3C are explanatory diagrams showing a construction method for the structure 10 of the second comparative example. [Figure 4] 4A to 4C are explanatory diagrams showing first to third examples of the structure 10 with the temporary material 20. FIG. [Figure 5] 5A and 5B are explanatory diagrams of concrete plates 30A and 30B used in the comparative experiments of the water-based paints 1A to 1C. [Figure 6] Fig. 6A is a diagram showing how water-based paints 1A to 1C are applied to a concrete plate 30. Fig. 6B is a diagram showing the amounts of water-based paints 1A to 1C applied. [Figure 7] 7A and 7B are diagrams showing how mortar 32 is applied to a concrete plate 30. FIG. [Figure 8] 8A and 8B are diagrams showing how the attachment 34 is attached to the mortar 32. FIG. [Figure 9] Fig. 9A shows the state after the tensile test, and Fig. 9B shows a list of the maximum loads for each of the water-based coating materials 1A to 1C. [Figure 10] FIG. 10 shows the results of a comparative test with and without the water-based paint 1. DETAILED DESCRIPTION OF THE INVENTION

[0012] At least the following points will become clear from the description and drawings to be described later.

[0013] A structure with temporary material is disclosed, which has a structure having a first surface and formed from a cement composition, and a temporary material having a second surface opposite to the first surface and formed from the cement composition, and is characterized in that a water-based paint is applied between the first surface and the second surface. With such a structure with temporary material, it is possible to easily control the thickness of the paint applied between the structure and the temporary material.

[0014] The water-based paint is preferably peelable from the first surface, which allows the water-based paint to be easily removed after the temporary material has been removed from the structure.

[0015] The water-based paint preferably contains an acrylic resin as a main component, which allows the water-based paint to be easily removed after the temporary material has been removed from the structure.

[0016] It is desirable that the thickness of the water-based paint applied between the first surface and the second surface be 0.03 mm or more and 0.08 mm or less, which maintains the integrity of the structure and the temporary material and makes it easier to remove the temporary material from the structure.

[0017] A method for constructing a structure is disclosed, which comprises preparing a structure formed from a cement composition, a temporary material formed from the cement composition, and a water-based paint, applying the water-based paint to the surface of the structure, joining the temporary material to the surface of the structure to which the water-based paint has been applied, and removing the temporary material and the water-based paint from the structure. This method for constructing a structure makes it easy to control the thickness of the paint applied between the structure and the temporary material.

[0018] It is desirable to remove the water-based paint from the structure by peeling it off, which makes it possible to easily remove the water-based paint after the temporary material has been removed from the structure.

[0019] ===This embodiment=== <Construction method for structure 10> 1A to 1D are explanatory diagrams showing a construction method for a structure 10 of this embodiment. Figures 1A to 1D show an example of a construction method for a structure 10 in which construction is carried out by jointly pouring temporary materials 20 onto the surface of the structure 10. Note that Figures 1A to 1D show enlarged cross-sectional views of the joint surface between the structure 10 and the temporary materials 20.

[0020] In this embodiment, the structure 10 is a structure such as a wall or a floor. However, the structure 10 may be a structure other than a wall or a floor. In this embodiment, the structure 10 is formed of a cement composition. The cement composition is a material containing cement, such as concrete, mortar, or cement paste.

[0021] In this embodiment, the temporary material 20 is a member that is temporarily installed for the construction of the structure 10. In addition, in this embodiment, the temporary material 20 is formed of a cement composition. The temporary material 20 may be a cement composition with the same formulation as that of the structure 10, or may be a cement composition with a different formulation from that of the structure 10.

[0022] Hereinafter, the structure 10 provided with the temporary materials 20 may be referred to as a "structure with temporary materials."

[0023] 1A is an enlarged view of a structure-side surface 11 (hereinafter sometimes referred to as a "first surface") of a structure 10. As seen in the enlarged view shown in FIG. 1A, the structure-side surface 11 of the structure 10 formed of a cement composition is not smooth, but has irregularities.

[0024] In the construction method for the structure 10 of this embodiment, when providing the temporary material 20 on the structure 10, first, as shown in FIG. 1B, a water-based paint 1 is applied to the structure-side surface 11 of the structure 10.

[0025] The water-based paint 1 is a water-based paint that is applied between the structure 10 and the temporary material 20. In this embodiment, the water-based paint 1 contains an acrylic resin as a main component. For example, the water-based paint 1 is an acrylic polymer emulsion.

[0026] Furthermore, the water-based paint 1 is peelable from the structure-side surface 11. Specifically, after application, the water-based paint 1 becomes a film-like material and is peelable. In this embodiment, the water-based paint 1 is a paint called "strippable paint" or "strip paint" (hereinafter, sometimes referred to as "strippable paint"). Strippable paint is sometimes called strippable paint, peel-off coating, or peelable coating.

[0027] Strippable paint is a paint that temporarily protects the surface of easily damaged or corroded objects, such as metal materials or painted objects, during processing, transportation, or storage, and can be easily peeled off after its purpose is achieved. As specified in JIS Z 1708-1976 (Coated Strippable Plastics), there are four types of strippable paint: "organic solvent type," "water dispersion type," "organosol type," and "aqueous solution type." In this embodiment, the water-based paint 1 is a water-dispersible strippable paint. However, the water-based paint 1 may be a strippable paint other than a water-dispersible type.

[0028] In this embodiment, the water-based paint 1 is, for example, Proctectapeel Deckstrip, Proctectapeel Glassstrip Advanced, or Proctectapeel Vehiclestrip manufactured by Spraylat International Ltd. However, the water-based paint 1 may be other than these.

[0029] Next, as shown in Fig. 1C, a temporary material 20 is cast (overlaid) onto the structure-side surface 11 of the structure 10 to which the water-based paint 1 has been applied. Fig. 1C shows an enlarged view of the structure-side surface 11 of the structure 10 and the temporary material-side surface 21 (hereinafter sometimes referred to as the "second surface") of the temporary material 20. As seen in the enlarged view shown in Fig. 1C, the temporary material-side surface 21 of the temporary material 20 formed of the cement composition is also not smooth, but has irregularities.

[0030] 1C, the structure-side surface 11 of the structure 10 faces the temporary material-side surface 21 of the temporary material 20. The water-based paint 1 is applied between the structure-side surface 11 and the temporary material-side surface 21.

[0031] In this embodiment, by using a water-based paint 1 as the paint applied between a structure 10 formed from a cement composition and a temporary material 20 also formed from a cement composition, it is possible to prevent the water-based paint 1 from impregnating the structure 10 and the temporary material 20. This makes it easy to maintain a constant thickness (coating thickness) of the water-based paint 1 applied between the structure-side surface 11 of the structure 10 and the temporary material-side surface 21 of the temporary material 20. In this embodiment, the thickness of the water-based paint 1 applied between the structure-side surface 11 and the temporary material-side surface 21 is 0.03 mm or more and 0.08 mm or less.

[0032] As shown in FIG. 1D , the temporary material 20 is removed from the structure 10. While FIG. 1D schematically illustrates the temporary material 20 being removed from the structure 10 as a single unit, the temporary material 20 formed of a cement composition may also be removed from the structure 10 by chipping it. In this case, the water-based paint 1 can be peeled off from the structure-side surface 11, so the water-based paint 1 can be easily removed from the structure-side surface 11 of the structure 10. Note that in FIG. 1D , the temporary material 20 and the water-based paint 1 are simultaneously removed from the structure-side surface 11. However, particularly when the temporary material 20 is removed from the structure 10 by chipping it, the water-based paint 1 may remain on the structure-side surface 11. Even in this case, the water-based paint 1 of this embodiment allows the remaining water-based paint 1 to be peeled off from the structure-side surface 11. Therefore, the water-based paint 1 can be easily removed after the temporary material 20 has been removed from the structure-side surface 11.

[0033] <Comparative Example> First comparative example 2A to 2D are explanatory diagrams showing a construction method for the structure 10 of the first comparative example.

[0034] The construction method for the structure 10 of the first comparative example differs from the construction method for the structure 10 of this embodiment in that an oil-based paint 1' such as paint or grease is used instead of a water-based paint 1. Note that, in the construction method for the structure 10 of the first comparative example, the structure 10 and temporary material 20 are formed from a cement composition, similar to the construction method for the structure 10 of this embodiment. As shown in FIG. 2A, an oil-based paint 1' is applied to the structure-side surface 11 of the structure 10. The oil-based paint 1' has the property of being impregnated into the cement composition. Therefore, as shown in FIG. 2B, the oil content of the oil-based paint 1' is impregnated into the structure 10, resulting in a reduced thickness of the oil-based paint 1' after application.

[0035] As shown in Figure 2C, when temporary material 20 is applied (repeated) to the structure side surface 11 to which oil-based paint 1' has been applied, the thickness of the oil-based paint 1' applied between the structure side surface 11 and the temporary material side surface 21 becomes smaller than when the water-based paint 1 of this embodiment is used (0.03 mm or more and 0.08 mm or less).

[0036] In the first comparative example, the thickness of the oil-based paint 1' applied between the structure-side surface 11 of the structure 10 and the temporary material-side surface 21 of the temporary material 20 is reduced, which increases the adhesive strength at the joint surface between the structure 10 and the temporary material 20. This is because the structure-side surface 11 and the temporary material-side surface 21 have unevenness, which significantly affects the adhesive strength at the joint surface between the structure 10 and the temporary material 20. As a result, the adhesive strength at the joint surface between the structure 10 and the temporary material 20 increases, making it difficult to remove the temporary material 20 from the structure 10. Furthermore, as shown in FIG. 2D , when the temporary material 20 is removed from the structure 10, the oil-based paint 1' is likely to remain on the structure-side surface 11. This may cause the appearance of the structure-side surface 11 to be impaired.

[0037] Second comparative example 3A to 3C are explanatory diagrams showing a construction method for the structure 10 of the second comparative example.

[0038] In the second comparative example, as shown in FIG. 3A, the thickness of the oil-based paint 1' is increased in anticipation of the oil content of the oil-based paint 1' penetrating into the structure 10. As shown in FIG. 3B, in the second comparative example, as in the first comparative example, the oil content of the oil-based paint 1' penetrates into the structure 10, and the thickness of the oil-based paint 1' after application is reduced. However, if the paint thickness is increased too much in anticipation of the oil content of the oil-based paint 1' penetrating into the structure 10, the integrity of the structure 10 and the temporary material 20 may be impaired, as shown in FIG. 3C. In other words, when construction work is carried out by applying compressive and tensile axial forces and shear forces to both the structure 10 and the temporary material 20, the adhesive strength at the joint surface between the structure 10 and the temporary material 20 will be reduced.

[0039] In order to facilitate removal of the temporary material 20 from the structure 10 while maintaining the integrity of the structure 10 and the temporary material 20, it is necessary to keep the adhesion at the joint surface between the structure 10 and the temporary material 20 within a predetermined range. To achieve this, the thickness of the paint applied between the structure-side surface 11 of the structure 10 and the temporary material-side surface 21 of the temporary material 20 must be within a predetermined range. However, when an oil-based paint 1′ is used at the joint surface between the structure 10 and the temporary material 20, as in the first and second comparative examples, it becomes difficult to control the paint thickness. If the oil content of the oil-based paint 1′ penetrates into the structure 10 and the temporary material 20 and the paint thickness becomes thin, it may become difficult to remove the temporary material 20 from the structure 10. On the other hand, if the paint thickness is made too thick in anticipation of the oil content of the oil-based paint 1′ penetrating into the structure 10 and the temporary material 20, the integrity of the structure 10 and the temporary material 20 will be impaired.

[0040] Therefore, in this embodiment, by using the water-based paint 1, it is possible to prevent the water-based paint 1 from penetrating into the structure 10 and the temporary material 20. This makes it easy to maintain a constant coating thickness of the paint applied between the structure-side surface 11 of the structure 10 and the temporary material-side surface 21 of the temporary material 20. In other words, it is possible to easily manage the coating thickness of the paint applied between the structure 10 and the temporary material 20.

[0041] <Example> 4A to 4C are explanatory diagrams showing first to third examples of the structure 10 with the temporary material 20. FIG.

[0042] First Example FIG. 4A shows a first embodiment of a structure 10 with temporary materials 20. In the first embodiment shown in FIG. 4A, temporary materials 20 are provided at the interface with the structure 10, which serves as the main body, in order to install temporary construction equipment 22. As shown in FIG. 4A, the structure 10 is tilted relative to the horizontal plane, so that the temporary construction equipment 22 cannot be installed directly on the structure 10. Therefore, by providing temporary materials 20, the angle of the installation surface of the temporary construction equipment 22 can be adjusted to be horizontal. As shown in FIG. 4A, a water-based paint 1 is applied to the interface between the structure 10 and the temporary materials 20.

[0043] 4A, a frictional force is applied between the structure 10 and the temporary material 20. By applying a water-based paint between the structure-side surface 11 and the temporary material-side surface 21, the structure 10 and the temporary material 20 are maintained as a unit, and stress can be applied to both the structure 10 and the temporary material 20. In addition, by applying a water-based paint between the structure-side surface 11 and the temporary material-side surface 21, it becomes easier to remove the temporary material 20 from the structure 10.

[0044] Second Example FIG. 4B shows a second embodiment of the structure 10 with temporary materials 20. In the second embodiment shown in FIG. 4B, temporary materials 20 are provided on the floor surface of the structure 10 in order to set up a test specimen 23 to be used in an experiment or the like. By providing the temporary materials 20, the height of the installation surface for the test specimen 23 can be adjusted. In the second embodiment, the test specimen 23 may also be a jack.

[0045] 4B , a frictional force is also applied between the structure 10 and the temporary material 20. By applying a water-based paint between the structure-side surface 11 and the temporary material-side surface 21, the integrity of the structure 10 and the temporary material 20 is maintained, and stress can be applied to both the structure 10 and the temporary material 20. Furthermore, by applying a water-based paint between the structure-side surface 11 and the temporary material-side surface 21, it becomes easier to remove the temporary material 20 from the structure 10.

[0046] Third Example FIG. 4C shows a third embodiment of the structure 10 with temporary materials 20. The third embodiment shown in FIG. 4C illustrates an example of construction work in which seismic isolation retrofitting is applied to an existing building to improve its earthquake resistance. As shown in FIG. 4C, temporary materials 20 are provided between the columns of the structure 10 and the reaction blocks 24 to allow them to blend together. PC steel rods 25 are also provided, penetrating the structure 10. A space 27 for vibration isolation rubber is provided below the structure 10, which is supported using jacks 26. The third embodiment can also be used as an example of a pouring surface for filling mortar or bedding mortar when connecting construction steel materials or concrete blocks to a skeleton.

[0047] 4C , a frictional force is also applied between the structure 10 and the temporary material 20. By applying a water-based paint between the structure-side surface 11 and the temporary material-side surface 21, the integrity of the structure 10 and the temporary material 20 is maintained, and stress can be applied to both the structure 10 and the temporary material 20. Furthermore, by applying a water-based paint between the structure-side surface 11 and the temporary material-side surface 21, it becomes easier to remove the temporary material 20 from the structure 10.

[0048] <Comparative experiment of water-based paint 1> 5A and 5B are explanatory diagrams of concrete plates 30A and 30B used in the comparative experiments of the water-based paints 1A to 1C.

[0049] The following describes tensile tests conducted using three types of water-based paints 1A to 1C to confirm the integrity of the structure 10 and the temporary material 20 with respect to the water-based paint 1 used in this embodiment. The following tests are conducted to verify the integrity of a concrete plate 30 representing the structure 10 and mortar 32 representing the temporary material 20. The water-based paints 1A to 1C are Proctectapeel Deckstrip (water-based paint 1A), Proctectapeel Glassstrip Advanced (water-based paint 1B), and Proctectapeel Vehiclestrip (water-based paint 1C), respectively, manufactured by Spraylat International Ltd.

[0050] As shown in Figures 5A and 5B, two 300mm x 300mm concrete plates 30 are prepared. One concrete plate 30A has a surface finish with almost no air bubbles, while the other concrete plate 30B has a surface finish with air bubbles visible.

[0051] FIG. 6A is a diagram showing how water-based paints 1A to 1C are applied to a concrete slab 30. FIG. 6B is a diagram showing the application amounts of water-based paints 1A to 1C. FIGS. 7A and 7B are diagrams showing how mortar 32 is applied to a concrete slab 30. FIGS. 8A and 8B are diagrams showing how an attachment 34 is attached to the mortar 32. In the following, when a general description is given for the concrete slab 30, subscripts may not be used. For example, both concrete slab 30A and concrete slab 30B may be simply referred to as "concrete slab 30."

[0052] As shown in FIG. 6A, three types of water-based paints 1A to 1C were applied in standard amounts to concrete boards 30A and 30B. Here, the standard amount is the standard application amount determined by the water-based paint 1, and for the water-based paint 1 used in this comparative experiment, it was 250 to 350 g / m 2 In this comparative experiment, the coating was performed using a roller. The actual coating amounts on the concrete boards 30A and 30B are shown in FIG. 6B.

[0053] Next, as shown in FIG. 7A, a frame 31 is attached to the concrete plate 30, and as shown in FIG. 7B, mortar 32 is applied to the inside of the frame 31.

[0054] After the mortar 32 has hardened, as shown in Fig. 8A, the frame 31 is removed and cutting lines 33 are drawn, thereby creating a plurality of areas surrounded by the cutting lines 33. Then, as shown in Fig. 8B, attachments 34 are attached to a plurality of predetermined areas.

[0055] Fig. 9A shows the state after the tensile test, and Fig. 9B shows a list of the maximum loads for each of the water-based coating materials 1A to 1C.

[0056] As shown in FIG. 9A, the tensile test involves pulling an attachment 34 attached to mortar 32. At this time, the maximum load is measured using a tester (not shown, for example, a Construction Research Institute adhesive strength tester). A list of the maximum loads for each of the water-based paints 1A to 1C is shown in FIG. 9B. As shown in FIG. 9B, water-based paint 1A had a large variation, but the average value (Av.) was the smallest.

[0057] In this tensile test, by applying a water-based paint 1 to the joint between the structure 10 (concrete plate 30) and the temporary material 20 (mortar 32), tensile failure occurred at the surface coated with the water-based paint 1. In other words, failure was suppressed on the structure 10 side, and it is thought that the risk of damaging the existing structure 10 is reduced.

[0058] <Comparative test with or without water-based paint 1> Figure 10 shows the results of a comparative test with and without water-based paint 1. In Figure 10, a comparative test with and without water-based paint 1 was conducted separately from the comparative experiment with water-based paint 1 in order to confirm the maximum load when water-based paint 1 was not applied.

[0059] As with the comparative experiment for the water-based paint 1 described above, the integrity of the concrete plate 30, which represents the structure 10, and the mortar 32, which represents the temporary material 20, is tested. In the comparative test for the presence or absence of the water-based paint 1, the maximum load without the water-based paint 1 is compared with the maximum load with the water-based paint 1. As shown in Figure 10, the average tensile bond strength without the water-based paint 1 is 2.08 N / mm 2 The average tensile adhesive strength with water-based paint 1 was 1.43 N / mm 2 In this way, by using water-based paint 1, the tensile adhesive strength is reduced to about 70%, but the adhesive strength required for construction can be ensured.

[0060] ===Other=== The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and it goes without saying that the present invention includes equivalents thereof. [Explanation of symbols]

[0061] 1(1A・1B・1C) Water-based paint, 1' Oil-based paint, 10 structure, 11 structure side surface (first surface), 20 temporary material, 21 temporary material side surface (second surface), 22 Temporary construction equipment, 23 Test specimen, 24 Block, 25 PC steel rod, 26 jack, 27 space for vibration isolation rubber, 30 (30A·30B) Concrete plate, 31 Frame, 32 Mortar, 32A Mortar piece, 33 Cut line, 34 Attachment

Claims

1. A structure formed of a cement composition, a temporary material formed of a cement composition (excluding a sealant that prevents leakage of a curable resin such as an epoxy resin injected onto a concrete surface coated with a water-based primer), and a water-based paint are prepared. applying the water-based paint to the surface of the structure; Joining the temporary material to the surface of the structure to which the water-based paint has been applied; and Removing the temporary material and the water-based paint from the structure. A construction method for a structure, comprising:

2. 2. A method for constructing a structure according to claim 1, The water-based paint is removed from the structure in a peeling manner. A construction method for a structure, comprising:

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