JP5771347B1 - Method for manufacturing concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a concrete structure in which the concrete curing of a joint portion of a curing sheet is more reliably performed and the work efficiency is improved. A method for manufacturing a concrete structure includes a placing step of placing concrete in a state where curing sheets 10 and 12 are attached to the inner surface of a mold 5 for placing concrete, and after placing the concrete. A demolding process for demolding the mold 5 and a curing process for curing the concrete for a predetermined period by leaving the curing sheets 10 and 12 on the surface of the concrete after the demolding process are provided. In this manufacturing method, when the curing sheets 10 and 12 are attached to the inner surface of the mold 5, the gap 11 between the adjacent curing sheets 10 and 12 is covered with the belt-shaped seam sheet 20, and the seam sheet 20 is the curing sheet. 10 and 12 are bonded to the seam side edges 10c and 12c. [Selection] Figure 3

Description

  The present invention relates to a method for manufacturing a concrete structure.

  When constructing a concrete structure, the placed concrete is covered with a curing sheet and the concrete is cured. In the concrete curing with such a curing sheet, a gap may be formed between the curing sheets. However, if the gap is formed, the curing of the portion becomes insufficient. Therefore, for example, by connecting the curing sheets to be bonded to the concrete surface after demolding with a gum tape or covering the gap with another sheet, or by overlapping the ends of the curing sheet, the gap is Concrete curing is performed so as not to occur (see, for example, Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 2002-089045 JP 2005-188241 A

  However, even if a tape or the like is attached to a seam such as a gap between the curing sheets attached after the mold is removed, the concrete may not be sufficiently cured. In addition, when the concrete surface is covered with a curing sheet after demolding and a tape or the like is applied to the joint, work efficiency may be deteriorated.

  Then, the subject of this invention aims at providing the manufacturing method of the concrete structure which improved the work efficiency while performing concrete curing of the joint part of a curing sheet more reliably.

  In order to solve the above-described problems, a method for manufacturing a concrete structure according to the present invention includes a placing step of placing concrete with a curing sheet pasted on the inner surface of a concrete casting form, A demolding step of demolding the formwork after placement, and a curing step of curing the concrete for a predetermined period by leaving the curing sheet on the surface of the concrete after the demolding step. And in this manufacturing method, when a curing sheet is affixed to the inner surface of the formwork, the seam between adjacent curing sheets is covered with a belt-like seam sheet, and the seam sheet is an edge of each seam side of the curing sheet. It is characterized by being glued to.

  In this method of manufacturing a concrete structure, when a curing sheet before placing concrete is stuck on the inner surface of a mold, a seam between adjacent curing sheets is covered with a seam sheet. In this case, since the placed concrete can be cured from the initial stage including the seam portion, the concrete curing including the seam portion of the curing sheet can be more reliably performed. Moreover, in this manufacturing method, when a curing sheet is affixed to the inner surface of a formwork, the seam sheet is bonded so as to cover the seam between the curing sheets. In this case, since the concrete is cast after the seam sheet is bonded in advance, the work can be performed more efficiently than hiding the seam portion after demolding. Moreover, in this case, since the edge of the curing sheet is covered with the seam sheet before placing the concrete, it is possible to prevent biting into the concrete even if the curing sheet has not been subjected to edge treatment. it can.

  In the above-described method for producing a concrete structure, a convex texture portion or a concave texture portion is formed on one surface of the seam sheet, and the seam sheet has a convex texture portion or a concave texture portion. It is preferable to adhere to the edge of the curing sheet so that the surface on which it is placed is the concrete placement side. In this case, these embossed portions are left in the placed concrete, and the curing sheet bonded to the seam sheet can be reliably left on the surface of the placed concrete. In addition, it is more preferable that the height of the convex texture portion or the depth of the concave texture portion of the seam sheet is 1 μm or more and 2000 μm or less. When the height or depth of the embossed portion is 1 μm or more, it is possible to improve the remaining property of the curing sheet. On the other hand, when the height or depth of the embossed portion is 2000 μm or less, when the seam sheet is removed from the concrete after curing, the marks of the embossed portion remaining on the concrete surface can be made thin, and the concrete surface is clean. It becomes possible to be in a state.

  In the above-described method for manufacturing a concrete structure, the seam sheet may be bendable so that the concrete placement side is a mountain. In this case, even if the curing sheet expands (or contracts) due to solar radiation or heat of hydration, the expansion of the curing sheet can be absorbed by the bendable seam sheet. And since it moves so that it may become a mountain at the concrete placement side, it becomes possible to let the front-end | tip part of this mountain penetrate | invade in concrete, and to leave a curing sheet on the concrete surface more reliably.

  In the above-described method for manufacturing a concrete structure, it is preferable that the seam sheet is bonded to the end of the curing sheet on the concrete placement side. In this case, it is possible to efficiently perform an operation of attaching a curing sheet to the inner surface of the mold. The seam sheet may be bonded to an end portion on the surface of the curing sheet on the mold side.

  In the above method for manufacturing a concrete structure, the seam sheet has a sheet main body portion and an adhesive portion disposed on the sheet main body portion, and a plurality of through holes are formed in the sheet main body portion. It is preferable. In this case, since a part of the placed concrete penetrates into the through hole and solidifies, it is possible to further enhance the ability to leave the curing sheet bonded to the joint sheet and the joint sheet on the concrete surface. it can. Moreover, when the convex embossing part is formed in the sheet | seat for seams, it is preferable that a through-hole is formed in the top part or side wall part of a convex embossing part. In this case, a portion of the placed concrete penetrates into the through-holes and the convex embossed parts and solidifies, so that the seam sheet and the curing sheet bonded to the seam sheet can be further left on the concrete surface. Can be enhanced.

  In the above-described method for producing a concrete structure, the seam sheet is preferably bonded to the curing sheet so as to cover all the seams between the adjacent curing sheets. In this case, the concrete curing of all the joint portions can be performed more reliably. Moreover, it is preferable that the seam sheet is bonded to the curing sheet so as to cover the corners on the seam part side of the curing sheet. If the corners of the curing sheet are not pressed firmly when placing concrete, the curing sheet may peel off due to the cast concrete. By holding down more firmly, peeling of the curing sheet can be suppressed. In addition, the curing sheet left on the concrete surface after mold removal is easy to peel off from the corner, and curing may not be performed properly as it is, but the corner of the curing sheet is covered with a seam sheet. By setting, it is possible to suppress the peeling of the curing sheet, and it is possible to further reliably cure the concrete.

  In the above method for producing a concrete structure, the seam sheet preferably has a sheet body made of the same material as the curing sheet. By forming the sheet main body of the seam sheet from the same material as the curing sheet, it is possible to perform curing treatment at the same level as the curing sheet at the seam portion. Here, the “same material” does not mean only the case of being made of the same material, but when thermoplastic resin is used as the material, it means that the same general thermoplastic resin is included. For example, when low density polyethylene is used, it means that all low density polyethylene is included.

  Further, the present invention can also be understood as an invention of a seam sheet used in the above-described method for producing a concrete structure, and the seam sheet is formed on a belt-like sheet main body part and one surface of the sheet main body part. And an adhesive portion disposed along at least the edge thereof. By using such a seam sheet for the above-described manufacturing method, it is possible to more reliably cure the seam portion of the curing sheet and improve the working efficiency.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the concrete structure which improved the work efficiency while performing concrete curing of the joint part of a curing sheet more reliably can be provided.

It is a flowchart which shows the outline | summary of the manufacturing method of the concrete structure which concerns on one Embodiment of this invention. It is sectional drawing which shows the outline | summary of the manufacturing method of the concrete structure which concerns on one Embodiment of this invention. It is a top view which shows the state which block | closed the clearance gap between curing sheets with the sheet | seat for joints. It is a figure which shows an example of the sheet | seat for seams, (a) is the top view, (b) is the bottom view, (c) is sectional drawing along CC line. It is a figure which shows the other example of the sheet | seat for seams, (a) is the top view, (b) is the bottom view, (c) is sectional drawing along CC line, (d) is the said sheet | seat. It is sectional drawing which shows the state bent. It is a figure which shows another example of the sheet | seat for a seam, (a) is the top view, (b) is the bottom view, (c) is sectional drawing along CC line. It is a figure which shows another example of the sheet | seat for clearance gaps, (a) is the top view, (b) is typical sectional drawing of the embossed part. It is a figure which shows the test result in an Example, (a) is a table | surface which shows a neutralization rate coefficient, (b) is a table | surface which shows residual force.

  Hereinafter, a method for producing a concrete structure according to the present invention will be described with reference to the drawings. Note that in the description, the same elements or elements having the same function may be denoted by the same reference numerals, and redundant description will be omitted.

  FIG. 1 is a flowchart showing an outline of a method for producing a concrete structure according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing an outline of a method for producing a concrete structure according to an embodiment of the invention. It is. As shown in FIG. 1, the method for manufacturing a concrete structure according to the present embodiment includes an installation step (step S1) for installing a curing sheet and a formwork, a placement step (step S2) for placing concrete, and placement. It includes a demolding step (step S3) for demolding the mold with the curing sheet remaining after hardening of the concrete, and a curing step (step S4) for curing the concrete structure with the remaining curing sheet.

  In the installation process of step S1, first, as shown in FIG. 2A, a plurality of curing sheets 10 and 12 used for curing the concrete structure 7a are prepared. It should be noted that when a general concrete structure is manufactured, a large number of curing sheets are usually used. However, in the present embodiment, a case where two curing sheets 10 and 12 are used will be described as an example in order to facilitate the description. . However, the same applies when three or more curing sheets are used. The curing sheets 10 and 12 used in the present embodiment are, for example, rectangular sheets and have a thickness of about 0.02 mm to 2.0 mm. As the curing sheets 10 and 12, it is preferable to use a thermoplastic resin sheet. Examples of the thermoplastic resin used here include low density polyethylene, high density polyethylene, polypropylene, ethylene-propylene copolymer, and olefinic heat. Examples include olefin resins such as plastic elastomers; polyamides; polyethylene terephthalate; polycarbonates; vinyl chloride resins such as polyvinyl chloride, chlorinated polyvinyl chloride, and polyvinylidene chloride; fluorine resins. In addition, as the curing sheets 10 and 12 and the seam sheet 20 described later, it is preferable to use an olefin-based thermoplastic elastomer. The olefinic thermoplastic elastomer is an ethylene-propylene copolymer or a melt mixture or polymerization reaction product of polypropylene and ethylene-propylene rubber, such as “Prime TPO (registered trademark)” manufactured by Prime Polymer Co., Ltd., Nippon Polypro Co., Ltd. “Newcon (registered trademark)” manufactured by company, “Cataloy” manufactured by Sun Allomer Co., Ltd., “Zeras (registered trademark)” manufactured by Mitsubishi Chemical Corporation, and the like.

  When the preparation of the curing sheets 10 and 12 and the mold 5 is completed, the curing sheets 10 and 12 are attached to the inner surface of the mold 5 (the surface on the concrete placing side) as shown in FIG. At the time of this pasting, one surface 10a, 12a of the plurality of curing sheets 10, 12 becomes the concrete placing side surface, and the other surface 10b, 12b becomes the surface on the mold 5 side. When the curing sheets 10 and 12 are affixed to the mold 5, the curing sheets 10 and 12 are, for example, arranged adjacent to each other and affixed to the mold 5 (see FIG. 3). And the seam part (gap) between both curing sheets 10 and 12 is covered with the seam sheet so that the seam part is not exposed to the cast concrete. Details will be described later.

  Then, it progresses to the placement process of step S2, and as shown in FIG.2 (c), the concrete 7 is cast in the state in which the curing sheets 10 and 12 were affixed on the inner surface of the mold 5. FIG. Thereafter, when compaction of the concrete is completed, the concrete 7 is wet-cured for about 7 to 28 days, for example, while the mold 5 is fitted, and the concrete is hardened. The state is maintained until the concrete 7 is hardened.

  Subsequently, when the concrete is placed and cured in the placement process, the process proceeds to a demolding process of demolding the mold in step S3, and as shown in FIG. Is left so that the curing sheets 10 and 12 are covered, and the mold 5 is removed from the concrete 7.

  Subsequently, after removing the mold 5, the process proceeds to a curing process in step S <b> 4, and the concrete 7 is cured for a predetermined period using the curing sheets 10 and 12 left on the sticking surface of the concrete 7. Curing with the curing sheets 10 and 12 may be continued for 30 days or more after the mold 5 is removed, or may be continued for 90 days or more after the mold 5 is removed. Furthermore, of course, curing may be continued until the concrete structure is delivered (for example, one year or more after demolding). By continuing such long-term curing, the strength of the concrete 7 can be dramatically increased and its quality can be improved. When curing for a predetermined period is completed, the curing sheets 10 and 12 are removed from the concrete 7 as shown in FIG. 2 (e), whereby the concrete structure 7a is completed.

  Next, referring to FIG. 3, in the installation step S <b> 1, the joint portion between the curing sheets 10 and 12 is covered with the seam sheet 20, and the portion corresponding to this joint is also included in the subsequent placement step S <b> 2 and the like. The method for curing concrete will be described in more detail.

  FIG. 3 is a plan view showing a state in which a gap between the curing sheets is closed with a seam sheet. As shown in FIG. 3, a gap 11 may occur at the joint between the curing sheets 10 and 12 when the curing sheets 10 and 12 are attached to the mold 5. In the method for manufacturing a concrete structure according to the present embodiment, all the gaps 11 are covered with the seam sheet 20 so that the concrete portion corresponding to the gaps 11 is also cured. At this time, the seam sheet 20 also covers both corners 10d, 10e, 12d, and 12e on the seam side of the curing sheets 10 and 12. In addition, the seam sheet 20 has an adhesive portion, and the seam sheet 20 covers the gap 11 that is the seam portion between the adjacent curing sheets 10 and 12. The portions 10c and 12c are bonded and fixed by the bonding portion. In addition, in the example of FIG. 3, although the two curing sheets 10 and 12 are installed in one mold 5, it is not necessarily limited to this, and one curing sheet is provided for each mold. You may make it install, and it is possible to change suitably. In the manufacturing method according to the present embodiment, the gap 11 is thus closed, and concrete is placed and cured.

  Next, the seam sheet 20 that closes the gap will be described in more detail with reference to FIG. 4A and 4B are diagrams illustrating an example of a seam sheet, in which FIG. 4A is a top view thereof, FIG. 4B is a bottom view thereof, and FIG. 4C is a cross-sectional view taken along line CC. As shown in FIG. 4, the seam sheet 20 includes a strip-shaped sheet main body portion 22 having a predetermined thickness, and an adhesive portion 24 disposed on one surface 22 b of the sheet main body portion 22.

  The sheet main body 22 is made of, for example, a thermoplastic resin sheet, and is preferably made of the same material as the curing sheets 10 and 12. However, the sheet | seat main-body part 22 should just be comprised from the material which can perform concrete curing, and may be comprised from the material different from the curing sheets 10 and 12. FIG. The sheet main body portion 22 has a thickness of about 0.02 mm to 2.0 mm, similar to the curing sheets 10 and 12, and has a vertically long rectangular shape that becomes a belt shape when viewed from above.

  The adhesion part 24 is comprised from the double-sided tape or various adhesives, for example. In the example illustrated in FIG. 4, the bonding portion 24 is disposed only at both end portions along the end side of the sheet main body portion 22, but may be disposed so as to cover the entire back surface 22 b of the sheet main body portion 22. . Instead of providing the bonding portion 24, a part of the sheet main body portion 22 may be melted by heat and bonded and fixed to the curing sheets 10 and 12 so as to cover the gap 11.

  For example, as shown in FIG. 3, the seam sheet 20 having such a configuration is cured from the casting concrete side so that the front surface 22a faces the casting concrete side and the back surface 22b faces the mold 5 side. It is preferable to adhere to the sheets 10 and 12. However, the seam sheet 20 may be bonded to the curing sheets 10 and 12 from the mold side so that the front surface 22a faces the mold 5 side and the back surface 22b faces the cast concrete side.

  Thus, according to the manufacturing method of the concrete structure which concerns on this embodiment, when pasting the curing sheets 10 and 12 before concrete placement on the inner surface of the formwork 5, the joint between the adjacent curing sheets 10 and 12 is provided. The portion (gap 11) is covered with the seam sheet 20. For this reason, since the placed concrete can be cured from the initial stage including the seam portion, the concrete curing including the seam portion of the curing sheets 10 and 12 can be performed more reliably. Moreover, in this manufacturing method, when the curing sheets 10 and 12 are attached to the inner surface of the mold 5, the seam sheet 20 is bonded so as to cover the gap 11 between the curing sheets 10 and 12. Thus, since the concrete is cast after the seam sheet 20 is bonded in advance, the work can be performed more efficiently than hiding the seam portion after demolding. In addition, in this case, since the edges of the curing sheets 10 and 12 are covered with the seam sheet before the concrete is placed, even the curing sheets 10 and 12 that are not subjected to the end treatment are applied to the concrete. Biting and the like can be prevented.

  Moreover, in the manufacturing method of the concrete structure which concerns on this embodiment, the sheet | seat 20 for a joint is adhere | attached on the edge parts 10c and 12c on the surfaces 10a and 12a by the side of concrete placement of the curing sheets 10 and 12. FIG. For this reason, it becomes possible to perform efficiently the operation | work which affixes the curing sheets 10 and 12 to the inner surface of the formwork 5. FIG.

  Moreover, in the manufacturing method of the concrete structure which concerns on this embodiment, the sheet | seat 20 for a seam is adhesively fixed to the curing sheet | seats 10 and 12 so that all the clearance gaps 11 which are the joints between the adjacent curing sheet | seats 10 and 12 may be covered. Yes. For this reason, curing can be performed more reliably including the concrete portion corresponding to the entire gap 11 which is the joint portion. The seam sheet 20 is bonded to the curing sheets 10 and 12 so as to cover the corners 10d, 10e, 12d, and 12e on the side of the seam portions of the curing sheets 10 and 12. If corners of the curing sheet are not firmly pressed when placing concrete, the curing sheet may be peeled off by the placed concrete, but in this embodiment, the curing sheet 10, By firmly pressing the 12 corners 10d, 10e, 12d, and 12e with the seam sheet 20, peeling of the curing sheets 10 and 12 can be suppressed. Further, the curing sheet left on the concrete surface after mold removal is likely to be peeled off from the corners, and curing may not be performed properly as it is, but in this embodiment, the corners of the curing sheets 10 and 12 are used. By covering and bonding the portions 10d, 10e, 12d, and 12e with the seam sheet 20, it is possible to prevent the curing sheets 10 and 12 from being peeled off, and it is possible to cure concrete more reliably. It becomes.

  Further, in the method for manufacturing a concrete structure according to the present embodiment, the seam sheet 20 has a sheet body portion 22 made of the same material as the curing sheets 10 and 12. In this way, the sheet body portion 22 of the seam sheet 20 is formed of the same material as the curing sheets 10 and 12, so that the same level of curing treatment as the curing sheets 10 and 12 can be performed at the seam portion. It becomes. Here, the “same material” does not mean only the case of being made of the same material, but when thermoplastic resin is used as the material, it means that the same general thermoplastic resin is included. For example, when low density polyethylene is used, it means that all low density polyethylene is included.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to the said embodiment, It can apply to various embodiment. For example, in the above embodiment, the seam sheet 20 illustrated in FIG. 4 is illustrated as the seam sheet covering the gap 11 between the curing sheets 10 and 12, but the seam sheet is not limited to this, and various The sheet can be used. For example, the seam sheet 30 shown in FIG. 5 is configured to include a sheet main body 32 similar to the seam sheet 20 and an adhesive portion 34 provided on the back surface 32b, but (a) and (c) of FIG. ), The surface 30a on the concrete placing side further includes a bending groove 30c extending along the longitudinal direction. The seam sheet 30 can be bent by the bending groove 30c so that the concrete placement side (surface 32a side) is a mountain as shown in FIG. 5 (d). By providing the folding groove 30c so that it can be folded, the seam sheet 30 can be folded even if the curing sheets 10 and 12 are expanded (or contracted) by solar radiation or heat of hydration. Such expansion and the like can be absorbed by the seam sheet 30. And since it changes so that it may become a mountain at the concrete placement side, it becomes possible to make the front-end | tip part of this mountain penetrate | invade in concrete, and to leave the curing sheets 10 and 12 on the concrete surface more reliably.

  As another example, the seam sheet 40 shown in FIG. 6 includes a sheet body 42 similar to the seam sheet 20 and an adhesive portion 44 provided on the back surface 42b. ) And (c), the surface 42a on the concrete placing side is further provided with a convex or concave embossed portion 46, which is a minute projection. The embossed portion 46 shown in FIG. 6 shows an aggregate of these minute protrusions. The embossed portion 46 extends along the longitudinal direction of the joint sheet 40. The seam sheet 40 is preferably bonded to the edges of the curing sheets 10 and 12 so that the convex surface 46 or the surface 42a on which the concave surface 46 is formed is on the concrete placement side. When such a seam sheet 40 is used, these embossed portions 46 are left in the cast concrete, and the curing sheets 10 and 12 bonded to the seam sheet 40 are placed on the surface of the cast concrete. It can be reliably left behind. The height of the convex embossed portion 46 or the depth of the concave embossed portion 46 of the seam sheet 40 is preferably 1 μm or more and 2000 μm or less. When the height or depth of the embossed portion 46 is 1 μm or more, it is possible to improve the ability of the curing sheets 10 and 12 to remain on the concrete. On the other hand, when the height or depth of the embossed portion 46 is 2000 μm or less, when the seam sheet 40 or the like is removed from the concrete after curing, the imprint of the embossed portion remaining on the concrete surface can be reduced, and the concrete surface Can be kept in a beautiful state. In addition, since the embossing part 46 can be provided in the seam sheet 40 and the remaining property to the concrete can be improved, even when the curing sheets 10 and 12 having no remaining function are used when the seam sheet 40 is used, The sheet 40 for a seam can leave the curing sheets 10 and 12 more reliably on the concrete surface. Further, the embossed portions 46 may be further provided in the joint sheet 30 shown in FIG. In addition, when forming a convex embossed part in the sheet | seat for seams, you may make it form a through-hole in the top part or side wall part of a convex embossed part. In this case, a portion of the placed concrete penetrates into the through-holes and the convex embossed parts and solidifies, so that the seam sheet and the curing sheet bonded to the seam sheet can be further left on the concrete surface. Can be enhanced.

  As still another example, in the seam sheet 50 shown in FIG. 7, the convex embossed portions 56 can be formed in a row on the surface of the sheet, and a plurality of through holes 58 can be provided at both ends thereof. is there. In FIG. 7, the description of the adhesive portion is omitted, and the convex embossed portion 56 indicates each minute protrusion. When such a through-hole 58 is provided in the joint sheet 50, a part of the placed concrete enters into the through-hole 58 and solidifies, so that the curing sheets 10 and 12 bonded to the joint sheet 50 are used. It is possible to further improve the ability to leave the material on the concrete surface. The height H of the convex embossed portion 56 used here is, for example, not less than 1 μm and not more than 2000 μm.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to these Examples.

First, as Example 1, a curing sheet and a seam sheet made of the following materials were prepared. The curing sheet had a size of 19.8 cm × 39.8 cm, and the seam sheet had a size of width 56.0 mm × length 39.7 cm. Moreover, as shown in FIG. 4, the double-sided tape was adhere | attached on the both ends as shown in FIG.
Curing sheet: Polypropylene Seam sheet: Polypropylene

  Next, a formwork used for placing concrete was prepared. The dimension of the prepared formwork was 40 cm x 40 cm x 10 cm. Then, the above-described curing sheet is attached to the inner surface of the mold by using an aqueous polyvinyl alcohol solution (10% by weight), and the curing sheet adjacent to the seam portion (gap) between the curing sheets is covered by an adhesive portion so as to cover the joint portion (gap). Adhesive fixed to. After that, the concrete material obtained by mixing the concrete materials shown in Table 1 below with the composition shown in Table 2 was placed in the mold, and after the concrete was solidified, the mold was removed and the concrete structure The test body was obtained.

  Moreover, as Comparative Example 1, a test specimen of a concrete structure was obtained in the same manner as in Example 1 except that the gap between the curing sheets was not covered with the seam sheet.

  Then, as shown to (a) of FIG. 8, the neutrality in the concrete corresponding to each of the plywood part (gap part) of the comparative example 1, the curing sheet part of the example 1, and the sheet part for the joint of the example 1 The conversion rate coefficient (neutralization depth) was measured according to JIS A 1152. As a result, the neutralization rate coefficient in the concrete corresponding to the seam sheet portion in Example 1 is substantially the same as the neutralization rate coefficient in the concrete corresponding to the curing sheet portion in Example 1, and compared. As shown in Example 1, the neutralization rate coefficient could be lowered as compared with the case where the seam sheet was not used. That is, by covering the seam (gap) between the curing sheets as in Example 1 with the seam sheet, it is possible to reliably cure the concrete including the part corresponding to the seam, and the durability of the concrete structure It was confirmed that the performance can be improved as a whole.

Next, the test of the residual force to the concrete by the seam sheet was performed. In addition, the unevenness degree (ratio of the convex part area) per 1 m (width 12 mm) is 0.031 [m < ² > / m on the surface of the concrete casting side of the joint sheet used in Example 2 of this test. ], A plurality of convex embossed portions were provided. Further, through holes (hole diameter: 1.5 mm) having a predetermined pitch (4 mm) continuous in the longitudinal direction were formed on one side of the sheet. The seam sheet was made of polypropylene.

  The test of the residual force when the seam sheet having such a configuration was used was performed as follows. First, a seam sheet (having a length of 30 cm) in which a fishing jig was set in advance was bonded to the mold of the bottom plate. And the concrete similar to the above was poured into the formwork, the formwork was demolded at the age of 3 days, and the concrete test body according to Example 2 was obtained. On the other hand, a high-performance force gauge (FG-5005) was installed in the Amsler testing machine (UH-500kNI).

  After that, the fishing jig installed in the concrete test body according to Example 2 was hooked on the high-performance force gauge, and the joint sheet was attached to the seam sheet in a state where the high-performance force gauge was kept at a fixed position. The platform on which the body was placed was lowered at 60 mm / min. During the descent, the load at which the seam sheet peels from the concrete was measured every 0.2 seconds, and the average was measured as the residual force (g). In the test body according to Example 2, this remaining force was 500 g. Thus, when the residual force is 5 g or more, the residual force can be made larger than the adhesive force between the mold and the curing sheet, and when the mold is removed, the curing sheet is moved to the concrete side. Although it becomes easy to leave, according to the joint sheet according to Example 2, the remaining force could be 5 g or more.

In addition, Examples 3 and 4 were used by using the seam sheet in which the unevenness degree of the seam sheet used in Example 2 was changed to 0.02 [m ² / m] or 0.0096 [m ² / m], respectively. The concrete test body which concerns on this was obtained, and the residual force was measured similarly after that.

As a result, in the concrete test body according to Example 3 having an unevenness degree of 0.02 [m ² / m], the residual force is 150 g and the unevenness degree is 0.0096 [m ² / m]. In the concrete test body according to No. 4, the residual force was 100 g, and it was possible to make the residual force larger than 5 g as a reference. That is, it was confirmed that the curing sheet adhered to the joint sheet can be reliably left on the concrete surface by using the joint sheet according to Examples 2 to 4. Incidentally, if the asperity exceeds 0.07 ^[m 2 / ^m], since the uneven shape is transferred to the concrete begins to stand out, irregularities of the seam sheet is a 0.07 ^[m 2 / ^m] or less It is preferable.

  5 ... formwork, 7 ... concrete, 7a ... concrete structure, 10, 12 ... curing sheet, 10c, 12c ... edge, 10d, 10e, 12d, 12e ... corner, 11 ... gap, 20, 30, 40, 50 ... Seam sheet, 22, 32, 42 ... Sheet body part, 24,34,44 ... Adhesion part, 46,56 ... Wrinkle part, 58 ... Through hole.

Claims (10)

A placing step of placing concrete in a state where a curing sheet is attached to the inner surface of the mold for concrete placement;
A demolding step of demolding the formwork after placing the concrete;
A curing step for leaving the curing sheet on the surface of the concrete after the demolding step, and curing the concrete for a predetermined period,
When affixing the curing sheet to the inner surface of the formwork, the seam between the adjacent curing sheets is covered with a belt-like seam sheet, and the seam sheet is bonded to the edge of each of the curing sheets. A method for producing a concrete structure, comprising: On one surface of the seam sheet, a convex texture part or a concave texture part is formed,
The seam sheet is bonded to an edge portion of the curing sheet so that a surface on which the convex or concave textured portion is formed is on a concrete placing side. The manufacturing method of the concrete structure of description.   The method for producing a concrete structure according to claim 2, wherein a height of the convex textured portion or a depth of the concave textured portion of the seam sheet is 1 µm or more and 2000 µm or less.   The method for producing a concrete structure according to any one of claims 1 to 3, wherein the seam sheet is bendable so that a concrete placement side is a mountain.   The said seam sheet | seat is adhere | attached on the said edge part on the surface at the side of concrete placement of the said curing sheet, The manufacturing method of the concrete structure as described in any one of Claims 1-4 characterized by the above-mentioned.   The seam sheet has a sheet body portion and an adhesive portion disposed on the sheet body portion, and the sheet body portion is formed with a plurality of through holes. The manufacturing method of the concrete structure as described in any one of 1-5.   The method for producing a concrete structure according to any one of claims 1 to 6, wherein the joint sheet is bonded to the curing sheet so as to cover all the joints between the adjacent curing sheets. .   The said sheet for joints is adhere | attached on the said curing sheet so that the corner | angular part of the said joint side of the said curing sheet may be covered, The manufacture of the concrete structure as described in any one of Claims 1-7 characterized by the above-mentioned. Method.   The method for producing a concrete structure according to any one of claims 1 to 7, wherein the seam sheet has a sheet body made of the same material as the curing sheet. A seam sheet used in the method for producing a concrete structure according to any one of claims 1 to 9,
A seam sheet comprising: a belt-like sheet main body portion; and an adhesive portion disposed on at least one end of the sheet main body portion along the edge thereof.

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