JP5945058B1 - Manufacturing method of concrete structure and form with sheet - Google Patents

Abstract

A method of manufacturing a concrete structure and a form with a sheet that can further improve the surface quality of the concrete structure. A method for manufacturing a concrete structure includes a preparation process for preparing a concrete casting mold 1 and a curing sheet 10, an installation process for installing the mold 1, and a curing sheet on an inner surface 3 of the mold 1. 10 is affixed with the concrete C, a demolding process for demolding the formwork 1 after the concrete C is cast, and the curing sheet 10 is made of the concrete C after the demolding process. A curing step of leaving the concrete on the surface and curing the concrete C for a predetermined period. In this manufacturing method, the covering member 20 that covers the end portion 10a is disposed at the peripheral portion of the curing sheet 10 so that the end portion 10a of the curing sheet 10 is not exposed on the concrete placement side with respect to the plane S including the inner surface 3 of the mold 1. The placing process is performed using the curing sheet 10 that has been subjected to the edge treatment applied to the adhesive 16. [Selection] Figure 5

Description

  The present invention relates to a method for manufacturing a concrete structure and a form with a sheet.

  When constructing a concrete structure, a formwork for placing concrete is installed, concrete is placed with a curing sheet applied to the inner surface of the formwork in advance, and the formwork is removed after placing the concrete. The concrete that has been placed is covered with a curing sheet and the concrete is cured (see, for example, Patent Document 1). In the manufacturing method described in Patent Document 1, when the mold is removed after placing concrete, the curing sheet is left on the placed concrete so that the concrete is covered with the curing sheet and the concrete is cured.

Japanese Patent No. 5749930

  In such a method for producing a concrete structure, if concrete is not placed carefully when placing concrete, the edge of the curing sheet affixed to the inner surface of the mold will be lifted and drowned, and the mold and curing There is a possibility that a gap is formed between the sheet and the sheet. If the gap is formed, the concrete is placed in a state where the curing sheet is stuck to the inner surface of the mold, and thus the placed concrete may enter the gap. As a result, the curing sheet could bite into the concrete.

  In order to prevent such a situation, it is conceivable to attach a tape or the like from the inner surface side of the mold frame to the peripheral portion of the curing sheet affixed to the mold frame after the mold frame is installed. However, it is difficult to work from the inner surface side of the formwork when the amount of bar arrangement is large or the layout of the formwork is complicated, for example, in the case of a small-lot assembly in which the formwork is built one by one.

  Then, the subject of this invention aims at providing the manufacturing method of a concrete structure which can improve the quality of the surface of a concrete structure further, and the formwork with a sheet | seat.

  In order to solve the above problems, a method for producing a concrete structure according to the present invention includes a preparation step for preparing a concrete casting form and a curing sheet, an installation step for installing the form, and an inner surface of the form. A placing process for placing concrete with the curing sheet attached, a demolding process for demolding the mold after placing the concrete, and leaving the curing sheet on the concrete surface after the demolding process. A curing process for curing the concrete for a predetermined period of time, and a curing sheet that has been subjected to a predetermined edge treatment so that the edge of the curing sheet is not exposed on the concrete placement side relative to the plane including the inner surface of the formwork The placement process is performed using

  In this concrete structure manufacturing method, the end portion of the curing sheet is prevented from being exposed on the concrete placing side with respect to the plane including the inner surface of the mold by applying predetermined end processing to the curing sheet. By performing the placing process using this curing sheet, it is possible to suppress the floating and drooping in the peripheral portion of the curing sheet on the concrete placing side from the plane. Therefore, it is possible to prevent the curing sheet from entering the concrete by forming a gap into which the placed concrete enters. As a result, the surface quality of the concrete structure can be further improved.

  In the method for manufacturing a concrete structure described above, in the preparation step, after the curing sheet is affixed to the inner surface of the formwork, an edge treatment is performed by affixing a covering member that covers the edge of the curing sheet to the periphery of the curing sheet. May be applied. In this case, since the edge treatment is performed on the curing sheet in the preparation process, for example, even when it is difficult to work from the inner surface side of the mold after the installation process, the curing sheet subjected to the edge treatment is used. It is easy to perform the placing process. Therefore, it can suppress easily that a curing sheet cuts into concrete.

  In the above-described concrete structure manufacturing method, in the preparation step, an end treatment is performed in advance by pasting a covering member that covers an end of the curing sheet affixed to the inner surface of the formwork to the peripheral edge of the curing sheet. A form with a sheet may be prepared. In this case, in order to prepare the sheet-attached formwork in which the end treatment is preliminarily applied to the curing sheet in the preparation process, for example, even when it is difficult to work from the inner surface side of the formwork after the installation process, It becomes easy to perform the placing process using the curing sheet subjected to the edge treatment. Therefore, it can suppress easily that a curing sheet cuts into concrete.

  In the method for manufacturing a concrete structure, the covering member has a first surface and a second surface adjacent to the first surface, and the first surface is along the peripheral edge of the curing sheet. It is preferable that the second surface is disposed along the end surface of the mold. In this case, end treatment can be easily performed on the curing sheet.

  In the method for manufacturing a concrete structure, the first surface is bonded with the first adhesive force along the peripheral edge of the curing sheet, and the first adhesive force is 4.0 N / 25 mm or more and 8.0 N. / 25 mm or less is preferable. In this case, it is possible to maintain the state where the covering member is attached to the curing sheet in the placing step. The first adhesive force can be measured in accordance with Method 3 (the peeling angle is 180 °, the same applies hereinafter) defined in JIS Z 0237.

  In the method for manufacturing a concrete structure, the second surface is bonded with a second adhesive force along an end surface of the mold, and the second adhesive force is 0.5 N / 25 mm or more and 2.0 N / It may be 25 mm or less. In this case, when the mold is removed after placing the concrete, the mold can be removed with the covering member attached to the curing sheet. Therefore, it is possible to easily leave the curing sheet on the placed concrete. Note that the second adhesive force can be measured according to Method 3 defined in JIS Z 0237.

  In the above-described method for manufacturing a concrete structure, the covering member disposed along the end surface of the mold may be temporarily fixed to the mold. In this case, for example, even when the covering member on the end face of the mold is slid when a plurality of molds are built, the covering member can be prevented from shifting.

  In the method for manufacturing a concrete structure described above, in the preparation step, when the curing sheet is attached to the inner surface of the mold, the curing sheet is folded so that the peripheral edge of the curing sheet is along the end surface of the mold, or You may prepare the mold form with a sheet | seat by which a curing sheet was previously folded so that the peripheral part of the curing sheet affixed on the inner surface may follow the end surface of a mold frame. In this case, another member for covering the end portion of the curing sheet can be omitted.

  In the above-described method for producing a concrete structure, it is preferable to perform end treatment over the entire circumference of the peripheral edge of the curing sheet. In this case, since floating and dripping are suppressed over the entire periphery of the periphery of the curing sheet, the curing sheet can be prevented from biting into the concrete over the entire periphery of the curing sheet.

  The present invention can also be understood as an invention of a formwork with a sheet for producing a concrete structure. The formwork with a sheet is formed on a concrete formwork and one surface of the formwork. It is characterized by comprising: an arranged curing sheet; and an end treatment unit that does not expose the end portion of the curing sheet on the side opposite to the other surface of the mold frame from a plane including one surface of the mold frame Yes.

  According to such a mold with a sheet, the end portion of the curing sheet disposed on one surface of the mold frame by the end processing unit is more than the plane including the one surface of the mold frame. It will not be exposed on the opposite side of the surface. As a result, for example, when the concrete is placed on the side opposite to the other surface of the formwork from the plane, it is suppressed that the peripheral edge portion of the curing sheet is floated or drooped on the concrete side. Therefore, it is possible to prevent the curing sheet from entering the concrete by forming a gap into which the placed concrete enters. As a result, the surface quality of the concrete structure can be further improved.

  In the above-described form with sheet, the end processing section may have a covering member that is attached to the peripheral edge of the curing sheet and covers the end of the curing sheet. In this case, the end processing portion can be easily formed. Therefore, it can suppress easily that a curing sheet cuts into concrete.

  In the above-described mold with sheet, the end processing section is continuously outside from the end of the sheet main body affixed to one surface of the mold within the curing sheet and the end of the sheet main body. The peripheral edge part may be arranged so as to be along the end face of the mold. In this case, another member for covering the end portion of the curing sheet can be omitted.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of a concrete structure and the formwork with a sheet | seat which can improve the quality of the surface of a concrete structure further can be provided.

FIG. 1 is a flowchart showing an outline of a method for producing a concrete structure according to an embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating an outline of a method for manufacturing a concrete structure according to an embodiment of the present invention. FIG. 3 is a plan view of the inner surface side of the sheet-form mold. FIG. 4 is a plan view of the outer surface side of the sheet-form mold. FIG. 5 is a cross-sectional view of the mold with sheet along the line VV in FIG. FIG. 6 is a cross-sectional view showing a reference example of a form with a sheet. FIG. 7 is a cross-sectional view showing an example of another embodiment of a form with sheet. FIG. 8 is a schematic diagram showing the contact angle of the surface of the curing sheet with water.

  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 concrete structure manufacturing method according to the present embodiment includes a preparation process (step S1) for preparing a concrete casting form and a curing sheet, and an installation process for installing the form (step S2). ), A placing process for placing concrete with the curing sheet attached to the inner surface of the mold (step S3), a demolding process for removing the mold after placing the concrete (step S4), and The curing step (step S5) includes leaving the curing sheet on the concrete surface after the demolding step and curing the concrete for a predetermined period.

  In the preparation process of step S1, first, as shown in FIG. 2A, a curing sheet 10 used for curing the concrete structure CS is prepared. Note that when a general concrete structure is manufactured, a large number of curing sheets are usually used. However, in order to facilitate the explanation in this embodiment, one curing sheet 10 is attached to a mold, and the mold An example will be described in the case of building one by one (in the case of a so-called small group). However, the same applies when two or more curing sheets are used. The curing sheet 10 used in the present embodiment is a rectangular sheet, for example, and has a thickness of about 0.02 mm to 2.0 mm. As the curing sheet 10, 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 olefin-based thermoplastic elastomer. Olefin resins such as polyamide; polyethylene terephthalate; polycarbonate; vinyl chloride resins such as polyvinyl chloride, chlorinated polyvinyl chloride, and polyvinylidene chloride; and fluorine resins. In addition, as the curing sheet 10 and the covering member 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.

  In the preparation step, the curing sheet 10 is attached to the inner surface 3 of the mold 1 (the surface on the concrete placement side of the mold 1, one surface). At the time of this pasting, one surface 12 of the curing sheet 10 becomes a concrete placement side surface of the curing sheet 10, and the other surface 14 becomes a surface of the mold 1 side. After pasting the curing sheet 10 on the inner surface 3 of the mold 1, the curing sheet 10 is subjected to predetermined end processing. Details will be described later. When the preparation of the mold 1 and the curing sheet 10 is completed, as shown in FIG. 2B, the process proceeds to the installation step of step S2, and the mold 1 is installed. The formwork 1 may be comprised only with a board | plate material, and may be comprised with the reinforcement member which reinforces at least the edge of a board | plate material and the said board | plate material.

  Then, it progresses to the placement process of step S3, and as shown in FIG.2 (c), the concrete C is cast in the state in which the curing sheet 10 was affixed on the inner surface 3 of the formwork 1. FIG. Thereafter, when compaction of the concrete is finished, the concrete C is wet-cured for about 7 to 28 days, for example, while the mold 1 is fitted, and the concrete is hardened. The state is maintained until the concrete C 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 S4, and as shown in FIG. The mold 1 is removed from the concrete C while leaving the surface covered with the curing sheet 10, and pulled away from the concrete C. At this time, the covering member 20 is left on the concrete C side together with the curing sheet 10.

  Subsequently, after removing the mold 1, the process proceeds to a curing process in step S <b> 5, and the concrete C is cured for a predetermined period using the curing sheet 10 left on the concrete C sticking surface. Curing with the curing sheet 10 may be continued for 30 days or more after the mold 1 is removed, or may be continued for 90 days or more after the mold 1 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 C can be dramatically increased and the quality thereof can be improved. When curing for a predetermined period is completed, as shown in FIG. 2E, the curing sheet 10 and the covering member 20 are removed from the concrete C, thereby completing the concrete structure CS.

  Next, referring to FIG. 3 to FIG. 5, in the preparation step S <b> 1, the curing sheet 10 is not exposed on the concrete placement side with respect to the plane S including the inner surface 3 of the mold 1. The method for suppressing the biting of the curing sheet 10 into the concrete C also in the subsequent placing step S3 and the like will be described in detail. FIG. 3 is a plan view of the inner surface side of the sheet-form mold. FIG. 4 is a plan view of the outer surface side of the sheet-form mold.

  As shown in FIGS. 3 to 5, at the peripheral edge 16 of the curing sheet 10, the peripheral edge 16 of the curing sheet 10 affixed to the inner surface 3 of the mold 1 is floated and drowned. A gap may be formed between the curing sheet 10 and the curing sheet 10. In the method for manufacturing a concrete structure according to the present embodiment, for example, in the preparation step, the curing sheet 10 is subjected to predetermined end processing. The predetermined end portion processing means that the end portion 10a of the curing sheet 10 is less than the plane S including the inner surface 3 of the mold 1 so that the end portion 10a of the curing sheet 10 is prevented from biting into the concrete C. This is a process of forming the end processing portion E so as not to be exposed on the installation side (the side opposite to the other surface of the mold 1). Here, the other surface of the mold 1 is the outer surface 5 of the mold 1. In addition, the process of performing a predetermined | prescribed edge part process to the curing sheet 10 is not limited to a preparation process.

  The end portion treatment in the present embodiment is performed in a state where the curing sheet 10 is adhered to the inner surface 3 of the mold 1 after the curing sheet 10 is adhered to the inner surface 3 of the mold 1. Specifically, in this preparation process, the covering member 20 is attached to the peripheral edge 16 of the curing sheet 10 so as to cover the end 10a of the curing sheet 10 in the preparation step. The covering member 20 is preferably affixed over the entire periphery of the peripheral edge portion 16 of the curing sheet 10. In addition, when affixing the curing sheet 10 to the mold 1, the end 10 a of the curing sheet 10 may be disposed so as to be located within the outer edge of the inner surface 3 of the mold 1 (see FIGS. 3 and 4). .

  The end processing unit E will be described in more detail with reference to FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. As FIG. 5 shows, the coating | coated member 20 used in order to perform an edge part process to the curing sheet 10 is an elongate member which has a cross-sectional L-shaped shape as an example. The length of the covering member 20 corresponds to the length of each end side of the mold 1 on which the covering member 20 is arranged. In the example of FIGS. 3 and 4, the covering member 20 is overlapped and attached to the peripheral edge portions 16 at the four corners of the curing sheet 10. However, the present invention is not limited to this, and the covering member 20 is not overlapped. It may be pasted or changed as appropriate. In the manufacturing method according to the present embodiment, the end portion 10a of the curing sheet 10 is thus covered with the covering member 20, and the concrete placing step is performed.

  The covering member 20 is made of, for example, a thermoplastic resin sheet, and is preferably made of the same material as the curing sheet 10. However, the covering member 20 only needs to be made of a material capable of curing concrete, and may be made of a material different from the curing sheet 10. The covering member 20 has a thickness of about 0.02 mm to 2.0 mm, like the curing sheet 10.

  The covering member 20 includes a first plate portion 22 and a second plate portion 26 that is adjacent to the first plate portion 22 via a bent portion 24. The first plate portion 22 includes a first surface 22a. The second plate portion 26 includes a second surface 26a. That is, the covering member 20 has a first surface 22a and a second surface 26a adjacent to the first surface 22a. For example, the covering member 20 has an adhesive portion (not shown) on the first surface 22a and the second surface 26a. The adhesive part is composed of, for example, a double-sided tape or various adhesives. For example, the bonding portion is entirely disposed on the first surface 22 a of the covering member 20 along the edge of the curing sheet 10. The adhesive portion may be entirely disposed on the second surface 26 a of the covering member 20 along the end surface 7 of the mold 1. Instead of providing the bonding portion, a part of the covering member 20 may be melted by heat and bonded and fixed to the curing sheet 10 or the mold 1.

  The 1st surface 22a is arrange | positioned so that the peripheral part 16 of the curing sheet 10 may be followed. The width of the first surface 22a along the extending direction of the covering member 20 is, for example, 5 mm to 20 mm. The first surface 22a is bonded and fixed to the one surface 12 of the peripheral edge portion 16 of the curing sheet 10 by the bonding portion so as to cover the end portion 10a of the curing sheet 10. The 1st surface 22a is adhere | attached with the 1st adhesive force along the peripheral part 16 of the curing sheet 10. FIG. The first adhesive force is preferably 4.0 N / 25 mm or more and 8.0 N / 25 mm or less. The first adhesive force may be greater than the adhesive force between the curing sheet 10 and the mold 1. In this case, when the mold 1 is removed after placing the concrete C, it is easy to separate the curing sheet 10 and the mold 1 with the covering member 20 and the curing sheet 10 attached. The first adhesive force can be measured according to Method 3 defined in JIS Z 0237.

  The second surface 26 a is disposed along the end surface 7 of the mold 1. The width of the second surface 26a along the extending direction of the covering member 20 is preferably equal to, for example, the total thickness of the thickness of the mold 1 (the width of the end surface 7) and the thickness of the curing sheet 10. The second surface 26 a may be bonded with the second adhesive force along the end surface 7 of the mold 1. The second adhesive force is preferably 0.5 N / 25 mm or more and 2.0 N / 25 mm or less. The second surface 26 a is not necessarily bonded along the end surface 7 of the mold 1. The second adhesive force may be 0 N / 25 mm or more and 2.0 N / 25 mm or less. The second adhesive force can be measured in accordance with Method 3 defined in JIS Z 0237.

  The covering member 20 having such a configuration is, for example, placed in concrete so that the first plate portion 22 is disposed on the concrete placing side and the second plate portion 26 is disposed on the mold 1 side. It is preferable to adhere to the peripheral edge 16 of the curing sheet 10 from the side. Here, for example, when the second adhesive force is 0.1 N / 25 mm or less, the covering member 20 is attached to the peripheral edge portion 16 of the curing sheet 10 and then covered along the end surface 7 of the mold 1. The covering member 20 may be temporarily fixed to the mold 1 in a state where the member 20 is disposed. For temporary fixing between the covering member 20 and the mold 1, for example, a curing tape 30 can be used. The curing tape 30 is a tape for temporarily fixing the covering member 20 to the mold 1 at least during the period until the placing process is completed. The curing tape 30 is formed so that the covering member 20 does not shift even if the covering member 20 on the end surface 7 of the mold 1 is slid when the plurality of molds 1 are installed. Fix it.

  Thus, according to the manufacturing method of the concrete structure which concerns on this embodiment, the edge part 10a of the curing sheet 10 contains the inner surface 3 of the formwork 1 by giving the edge part process mentioned above to the curing sheet 10. It is made not to be exposed on the concrete placing side than S. By performing the placing process using the curing sheet 10, it is possible to prevent the peripheral edge 16 of the curing sheet 10 from being floated or twisted on the concrete placing side with respect to the plane S. Therefore, it is possible to prevent the curing sheet 10 from biting into the concrete C by forming a gap into which the placed concrete C enters. As a result, the surface quality of the concrete structure CS can be further improved.

  Moreover, in this manufacturing method, after the curing sheet 10 is affixed to the inner surface 3 of the mold 1 in the preparation step, the covering member 20 that covers the end portion 10 a of the curing sheet 10 is affixed to the peripheral portion 16 of the curing sheet 10. Then, end processing is performed. Thereby, in order to perform an edge part process to the curing sheet 10 in a preparation process, even if it is difficult to work from the inner surface 3 side of the mold 1 after an installation process, for example, the curing which performed the edge part process It is easy to perform the placing process using the sheet 10. Therefore, the curing sheet 10 can be easily suppressed from biting into the concrete C.

  In the method for manufacturing a concrete structure according to the present embodiment, the covering member 20 includes a first surface 22a and a second surface 26a adjacent to the first surface 22a. 22 a is disposed along the peripheral edge 16 of the curing sheet 10, and the second surface 26 a is disposed along the end surface 7 of the mold 1. Thereby, an edge part process can be easily given to the curing sheet 10. FIG.

  Moreover, in the manufacturing method of the concrete structure which concerns on this embodiment, the 1st surface 22a is adhere | attached with the 1st adhesive force along the peripheral part 16 of the curing sheet 10, and the said 1st adhesive force is 4. It is 0N / 25mm or more and 8.0N / 25mm or less. Thereby, the state by which the coating | coated member 20 was affixed on the curing sheet in the placement process can be maintained.

  Moreover, in the manufacturing method of the concrete structure which concerns on this embodiment, the 2nd surface 26a is adhere | attached with the 2nd adhesive force along the end surface 7 of the formwork 1, and the said 2nd adhesive force is 0.5N. / 25 mm or more and 2.0 N / 25 mm or less. The second surface 26 a is not necessarily bonded along the end surface 7 of the mold 1. The second adhesive force may be 0 N / 25 mm or more and 2.0 N / 25 mm or less. In this case, when removing the mold 1 after placing the concrete C, the curing sheet 10 can be easily left on the placed concrete C in a state where the covering member 20 is attached to the curing sheet 10. .

  Moreover, in the manufacturing method of the concrete structure which concerns on this embodiment, after affixing the coating | coated member 20 on the peripheral part 16 of the curing sheet | seat 10 in a preparatory process, the coating | coated member 20 is along the end surface 7 of the formwork 1. In the disposed state, the covering member 20 and the mold 1 are temporarily fixed to each other. Thereby, for example, when the covering member 20 on the end surface 7 of the mold 1 is slid when the plurality of molds 1 are installed, the covering member 20 can be prevented from shifting.

  Moreover, in the manufacturing method of the concrete structure which concerns on this embodiment, the coating | coated member 20 is affixed over the perimeter of the peripheral part 16 of the curing sheet 10. FIG. That is, end treatment is performed over the entire circumference of the peripheral edge 16 of the curing sheet 10. Thereby, since it is suppressed that a float and dripping arise over the perimeter of the peripheral part 16 of the curing sheet 10, it suppresses that the curing sheet 10 bites into the concrete C over the perimeter of the curing sheet 10. Can do.

  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-described embodiment, the end processing (end processing unit E) illustrated in FIG. 5 is illustrated, but is not limited thereto, and various forms can be adopted.

For example, in the reference example shown in FIG. 6, the covering member 20 is not provided, and the end portion 10 a of the curing sheet 10 is not exposed on the concrete placing side from the plane S including the inner surface 3 of the mold 1. This is different from the end processing unit E of the above embodiment.

  In the example of FIG. 6, the end processing portion E includes an end portion 10 b of the sheet main body portion 18 attached to the inner surface 3 (one surface) of the mold 1 in the curing sheet 10, and the end portion 10 b. It is comprised from the peripheral part 16 extended on the outer side continuously, and the said peripheral part 16 is arrange | positioned over the perimeter of the peripheral part 16 of the curing sheet 10 so that the end surface 7 of the formwork 1 may be followed. . The curing sheet 10 is bent at the end 10 b of the sheet main body 18. The curing sheet 10 is shaped to extend from the inner surface 3 to the end surface 7 of the mold 1. In the curing sheet 10, the position of the end 10 b corresponds to the position of the boundary between the inner surface 3 and the end surface 7 of the mold 1. A surface 16 a in the peripheral edge portion 16 of the curing sheet 10 is arranged along the end surface 7 of the mold 1. The end portion 10 a of the curing sheet 10 is disposed near the boundary between the outer surface 5 and the end surface 7 of the mold 1.

  For example, when the curing sheet 10 is attached to the inner surface 3 of the mold 1 in the preparation process, the end processing unit E sets the curing sheet 10 so that the surface 16 a of the curing sheet 10 follows the end surface 7 of the mold 1. It can form by giving the edge part process to bend | fold to the curing sheet 10. FIG. Alternatively, in the preparation step, the sheet-form mold 1S in which the curing sheet 10 is bent in advance so that the peripheral edge portion 16 of the curing sheet 10 attached to the inner surface 3 of the mold 1 is along the end surface 7 of the mold 1 is used. You may prepare. In these cases, it is preferable to perform such end portion treatment over the entire circumference of the peripheral edge portion 16 of the curing sheet 10. Also in the case of such an end processing portion E, the end portion 10a of the curing sheet 10 can be prevented from being exposed on the concrete placing side with respect to the plane S including the inner surface 3 of the mold 1. As a result, the curing sheet 10 can be prevented from biting into the concrete C. That is, another member for covering the end portion 10a of the curing sheet 10 can be omitted.

Moreover, as an example of another embodiment, in the example shown in FIG. 7, the mold 1 in a state where the curing sheet 10 is adhered to the inner surface 3 and the curing sheet 10 ′ that is adhered to the inner surface 3 ′. The mold 1 'is arranged so as to be orthogonal to each other. In the example of FIG. 7, the end processing section E prevents the end portion 10 a of the curing sheet 10 from being exposed on the concrete placing side from the plane S including the inner surface 3 of the mold 1 in the orthogonal portion. The end treatment portion E of the above embodiment is configured such that the end portion 10a ′ of the curing sheet 10 ′ is not exposed on the concrete placing side from the plane S ′ including the inner surface 3 ′ of the mold 1 ′. Is different.

  In the example of FIG. 7, the end processing unit E attaches the curing sheet 10, 10 ′ to the inner surfaces 3, 3 ′ of the molds 1, 1 ′, and then the inner surfaces 3, 3 ′ of the molds 1, 1 ′. In the state where the curing sheets 10 and 10 'are attached to the substrate. For example, in the preparation step, the end processing unit E applies the covering member 20 to the peripheral portions 16 and 16 ′ of the curing sheets 10 and 10 ′ so as to cover the ends 10a and 10a ′ of the curing sheets 10 and 10 ′. It can form by giving the edge part process to stick to the curing sheet 10. FIG. The first surface 22a is disposed along the peripheral edge portion 16 of the curing sheet 10, and the second surface 26a is disposed along the peripheral edge portion 16 'of the curing sheet 10'. In the case of such an end processing unit E, the curing sheets 10 and 10 ′ can be prevented from biting into the concrete C. Here, for example, the product of the contact area and the adhesive strength at the portion where the end surface 7 is in contact with the second surface 26a, and the contact area and the adhesive strength at the portion where the one surface 12 'is in contact with the second surface 26a. When the covering member 20 is affixed to the peripheral edge 16 of the curing sheet 10, the covering member 20 extends along the end surface 7 of the mold 1 and the one surface 12 ′ of the mold 1 ′. The covering member 20 may be temporarily fixed to the molds 1 and 1 ′ in a state where is disposed.

  In the above-described embodiment, in the preparation step, after the curing sheet 10 is adhered to the inner surface 3 of the mold 1, the covering member 20 that covers the end portion 10 a of the curing sheet 10 is adhered to the peripheral portion 16 of the curing sheet 10. The end treatment described above was performed. However, in the preparatory process, the end treatment described above is performed in advance by pasting the covering member 20 covering the end 10a of the curing sheet 10 affixed to the inner surface 3 of the mold 1 to the peripheral edge 16 of the curing sheet 10. The applied sheet form 1S may be prepared. In this case, in order to prepare the sheet-form mold 1S in which the edge treatment is performed on the curing sheet 10 in the preparation process, for example, it is difficult to work from the inner surface 3 side of the mold 1 after the installation process. Even if it exists, it becomes easy to perform a placement process using the curing sheet 10 which performed the edge part process. Therefore, the curing sheet 10 can be easily suppressed from biting into the concrete C.

  Further, for example, as the curing sheet 10 in the above-described embodiment, a sheet having a contact angle with water of the contact surface on the concrete C side of the curing sheet 10 of 50 degrees or more may be adopted. Specifically, the contact angle θ of the contact surface of the curing sheet 10 with water is preferably 69 degrees or more, more preferably the contact angle θ is 80 degrees or more, and the contact angle θ is 90 degrees or more. Even more preferably.

γ_Ｓ：固体の表面張力
γ_Ｌ：液体の表面張力
γ_ＳＬ：固体と液体の界面張力 Here, as shown in FIG. 8A, the “contact angle θ” is an angle formed between the tangent of the droplet and the solid surface (the surface of the curing sheet 10), and the following formula (1) Indicated by

γ _S : surface tension of solid γ _L : surface tension of liquid γ _SL : interfacial tension between solid and liquid

The “contact angle θ” can be measured by, for example, the θ / 2 method. Specifically, as shown in FIG. 8B, the radius r and height h of the droplet are obtained. And contact angle (theta) can be calculated | required from the following formula | equation (2) and Formula (3).

  Usually, if the concrete C contains excess water more than the amount necessary for the initial hardening of the cement, breathing water may be generated when the concrete C hardens after being placed. As described above, generation of breathing water can be effectively suppressed by using the curing sheet 10 having a contact angle with water of 50 degrees or more at the time of placing. The generation of breathing water is suppressed in this way if the contact angle (also referred to as the wetting angle) of the sheet surface (contact surface) of the curing sheet 10 covering the surface of the concrete C is included in the concrete C. The water that is about to come out from the surface and the air existing in the water is pushed back into the concrete C at the sheet contact surface, and as a result, the water and the air inside the water remain in the concrete C. This is considered to be because the curing proceeds. And according to this curing sheet 10, since generation | occurrence | production of breathing water is suppressed in this way, the concrete C will contain the water required for the hydration reaction after demolding, and concrete curing is carried out. In this case, a concrete structure capable of expressing a quality such as a predetermined compressive strength and durability can be produced without supplying curing water from the outside or using the curing water so much.

The curing sheet 10 is preferably a sheet having a low water vapor permeability of the sheet, the water vapor permeability of the sheet is preferably 10 g / m ² · 24 h or less, and the water vapor permeability of the sheet is 5 g / m ^2. -It is much more preferable that it is 24 hours or less. The curing sheet 10 is preferably a sheet having a low carbon dioxide permeability of the sheet, and the carbon dioxide permeability of the sheet is preferably 100,000 cc / m ² · 24 h · atm or less. More preferably, the permeability is 50,000 cc / m ² · 24 h · atm or less. By processing the surface of the material by various surface processing techniques, a sheet with reduced water vapor permeability or carbon dioxide permeability can be produced.

  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 covering member made of the following materials were prepared. The curing sheet has a size of 1798 mm × 898 mm × 0.2 mm, and the covering member has a width of the first surface of 20.0 mm, a width of the second surface of 60.0 mm, and a thickness of 0. It had a size of 2 mm. Next, a formwork used for placing concrete was prepared. A mold was composed of a 12 mm thick plywood and a 48 mm thick reinforcing member for reinforcing the plywood. The dimension of the prepared formwork was 1800 mm x 900 mm x 60 mm (180 cm x 90 cm x 6.0 cm). In addition, a double-sided tape was adhered to the first surface and the second surface of the covering member to form an adhesive portion. The first adhesive force was 6.50 N / 25 mm, and the second adhesive force was 0.0 N / 25 mm, for example, by not releasing the release paper of the double-sided tape. The 1st adhesive force and the 2nd adhesive force were measured based on the method 3 prescribed | regulated to JISZ0237. Three curing sheets were prepared, and three covering members were prepared for the curing sheet.
Curing sheet: Polypropylene Coating material: Polypropylene

  And while affixing the curing sheet mentioned above on the inner surface of a formwork with polyvinyl alcohol aqueous solution (10 weight%), the 1st surface of a covering member is made to adhere with the 1st adhesive force along the peripheral part of a curing sheet. The second surface was arranged with a second adhesive force smaller than the first adhesive force along the end surface of the mold. The covering member was affixed over the entire periphery of the periphery of the curing sheet. The edge part process of the curing sheet was performed so that the edge part of a curing sheet might not be exposed in the concrete placement side rather than the plane containing the inner surface of a formwork.

  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 body of a concrete structure was obtained in the same manner as in Example 1 except that the end treatment of the curing sheet was not performed. Specifically, the concrete material obtained by mixing the concrete materials described in Table 1 with the formulation shown in Table 2 is placed in a mold that has not been subjected to edge treatment of the curing sheet, After the solidification, the mold was removed from the mold to obtain a concrete structure specimen.

  Thereafter, Example 1 and Comparative Example 1 were compared. In Example 1 and Comparative Example 1, it was confirmed that the curing sheet remained on the concrete surface after the mold was removed. In each of Example 1 and Comparative Example 1, the area ratio at which the leakage of the concrete surface occurred was compared. Noro leakage refers to a state in which concrete placed in a gap formed between the formwork and the curing sheet has entered. The area ratio is the ratio of the area of the portion where the leakage occurs in the curing sheet to the area of the curing sheet in contact with the concrete in a state where the curing sheet is left in the placed concrete.

As a result, as shown in Table 3, according to the method of Example 1, it was possible to suppress the area ratio in which noro leakage occurred compared to Comparative Example 1.

  That is, as in Example 1, the end portion of the curing sheet is subjected to the end treatment so that the end portion of the curing sheet is not exposed on the concrete placement side with respect to the plane including the inner surface of the mold frame, so that it floats on the peripheral portion of the curing sheet. It has been confirmed that it is possible to suppress the formation of a gap between the mold and the curing sheet, and to prevent the curing sheet from biting into the concrete.

  DESCRIPTION OF SYMBOLS 1 ... Formwork, 1S ... Formwork with sheet | seat, 3 ... Inner surface (one side), 5 ... Outer surface (the other side), 7 ... End surface, C ... Concrete, CS ... Concrete structure, 10 ... Curing sheet, 10a ... end part, 10b ... end part, 16 ... peripheral edge part, 18 ... sheet main body part, 20 ... covering member, 22a ... first surface, 26a ... second surface, E ... end part processing part, S ... plane.

Claims (12)

A preparation process for preparing a concrete casting form and a curing sheet;
An installation process for installing the formwork;
A placing step of placing concrete in a state where the curing sheet is attached to the inner surface of the mold; and
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,
In the preparation step, after the curing sheet is attached to the inner surface of the mold, the end of the curing sheet is not exposed on the concrete placing side from the plane including the inner surface of the mold. Applying an end treatment for attaching a sheet-shaped covering member covering the end to the peripheral edge of the curing sheet,
A method for manufacturing a concrete structure, wherein the placing step is performed using the curing sheet subjected to the end treatment. A preparation process for preparing a concrete casting form and a curing sheet;
An installation process for installing the formwork;
A placing step of placing concrete in a state where the curing sheet is attached to the inner surface of the mold; and
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,
In the preparation step, the sheet-shaped covering member that covers the end portion of the curing sheet that is affixed to the inner surface of the mold is placed on the concrete more than the plane in which the end portion of the curing sheet includes the inner surface of the mold Prepare a form with a sheet that has been subjected to end treatment in advance to be attached to the peripheral edge of the curing sheet so as not to be exposed on the side,
A method for producing a concrete structure , wherein the placing step is performed using the curing sheet subjected to the end treatment . The said covering member consists of thermoplastic resins, The manufacturing method of the concrete structure of Claim 1 or 2 characterized by the above-mentioned. The said covering member consists of the same kind of material as the said curing sheet, The manufacturing method of the concrete structure as described in any one of Claims 1-3 characterized by the above-mentioned. The covering member has a first surface and a second surface adjacent to the first surface;
The first surface is disposed along the periphery of said curing sheet, said second surface, characterized in that it is disposed along the end surface of the mold, according to claim 1 to 4 The manufacturing method of the concrete structure as described in any one of these . The first surface is bonded with a first adhesive force along a peripheral edge of the curing sheet, and the first adhesive force is 4.0 N / 25 mm or more and 8.0 N / 25 mm or less. The method for producing a concrete structure according to claim 5 . The second surface is bonded with a second adhesive force along an end surface of the formwork, and the second adhesive force is 0.5 N / 25 mm or more and 2.0 N / 25 mm or less. The manufacturing method of the concrete structure of Claim 5 or 6 . The method for manufacturing a concrete structure according to any one of claims 1 to 7 , wherein the covering member disposed along the end surface of the mold is temporarily fixed to the mold.   The method for producing a concrete structure according to any one of claims 1 to 8, wherein the end treatment is performed over the entire periphery of the peripheral portion of the curing sheet. A formwork for placing concrete;
A curing sheet placed on one side of the formwork;
An end treatment portion that does not expose the end portion of the curing sheet on the side opposite to the other surface of the mold than a plane including one surface of the mold;
Equipped with a,
The said edge part process part is affixed on the peripheral part of the said curing sheet, and has a sheet-like coating | coated member which covers the edge part of the said curing sheet, The formwork with a sheet | seat characterized by the above-mentioned . The sheet-form mold according to claim 10, wherein the covering member is made of a thermoplastic resin. The said cover member consists of the same kind of material as the said curing sheet, The formwork with a sheet | seat of Claim 10 or 11 characterized by the above-mentioned.

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