JP7141726B2 - Resin mold and method for manufacturing resin mold - Google Patents

Description

The present invention relates to a resin mold and a method for manufacturing a resin mold. More specifically, the resin form and the resin form that are hard to break and have excellent durability by giving the resin form a predetermined strength and suppressing the peeling of the resin layer from the frame when the mold is released. It relates to a manufacturing method.

Conventionally, metal or resin forms have been used as forms used in the manufacture of concrete products. However, with metal forms, rust generated in the form adheres to the concrete product, lowering its commercial value.

On the other hand, resin molds are easy to handle because they do not rust and are lighter than metal molds.

However, resin molds are not strong enough compared to metal molds. For example, if the formwork is used or transported, it may be damaged if it receives an impact.

Therefore, in order to solve these problems, the invention "foaming synthetic resin formwork" shown in Patent Document 1 has been proposed. In this invention, a rigid plate attached to the surface of the foamed synthetic resin base material opposite to the concrete placing side of the formwork member, or a metal wire embedded in the foamed synthetic resin base material, is used to form the formwork itself. It reinforces Thereby, strength can be given to the resin mold.

JP-A-10-121720

However, in the invention of Patent Document 1, when the form member is released from the form member, the form member embedded with the rigid plate or the metal wire is elastically released like a leaf spring. Formwork members are likely to be damaged, such as when the resin formwork is peeled off. For this reason, it was difficult to repeatedly use the formwork many times.

The present invention has been devised in view of the above points. An object of the present invention is to provide a resin mold having excellent durability and a method for manufacturing the resin mold.

In order to solve the above-mentioned problems, the resin formwork of the present invention includes a frame body having a predetermined rigidity provided with an anchor portion on the surface, and a frame member covering the surface so as to bury the anchor portion. , and a resin layer having a mold portion of a predetermined shape.

Here, the shape of the resin layer can be supported by the frame having a predetermined rigidity and the resin layer provided covering the surface, and deformation of the resin mold can be suppressed. As a result, the resin mold can have a predetermined strength.

In addition, the resin layer and the frame are engaged with each other through the anchor portion by the frame having the anchor portion provided on the surface thereof and the resin layer provided covering the surface so as to bury the anchor portion. Due to this effect, the frame and the resin layer are strongly bonded. As a result, it is possible to prevent the resin layer from peeling off from the frame when the mold is released, so that the resin mold can be made resistant to breakage and excellent in durability.

In addition, the resin layer having a mold portion of a predetermined shape enables the mold portion to be a mold that imitates the shape of the concrete product when manufacturing a concrete product.

In addition, when the frame is made of metal, not only can the resin mold have sufficient strength, but even if rust occurs on the frame, it is covered with the resin layer, so the metal mold can be It is possible to suppress the deterioration of commercial value due to adhesion of rust generated on the frame to concrete products.

In addition, when the frame is made of wood or reinforced plastic, not only can the resin mold have a predetermined strength, but rust does not occur on the frame, so the commercial value of the concrete product increases. It is possible to suppress the decrease. In addition, the weight of the resin formwork can be reduced compared to the metal formwork, which facilitates handling.

Further, when the anchor portion protrudes from the surface of the frame and is bent or curved, the resin layer and the frame are integrally connected by the anchor portion biting into the resin layer. As a result, it is possible to prevent the resin layer from peeling off from the frame when the mold is released, so that the resin mold can be made resistant to breakage and excellent in durability.

In addition, a plurality of anchor portions are provided, and bent or curved curved portions of the anchor portions extend in a direction parallel to the surface of the frame, and each anchor portion extends in a direction that intersects the extending directions of the curved portions. When it is oriented, the anchor portion can be provided over a wide range of the surface of the frame, so that the frame and the resin layer can be integrally joined in a surface area having a predetermined width. As a result, when releasing the resin formwork, it is possible to suppress the peeling of the resin layer from the frame even if force is applied to the resin formwork. can do.

Further, when the anchor portion is a convex portion projecting from the surface of the frame, the resin layer and the frame are integrally connected by inserting the convex portion into the resin layer. As a result, it is possible to prevent the resin layer from peeling off from the frame when the mold is released, so that the resin mold can be made resistant to breakage and excellent in durability.

Further, when the anchor portion is a concave portion recessed from the surface of the frame, a part of the resin layer is accommodated in the concave portion, and the resin layer and the frame are integrally connected. As a result, it is possible to prevent the resin layer from peeling off from the frame when the mold is released, so that the resin mold can be made resistant to breakage and excellent in durability.

In order to solve the above-mentioned problems, a method for manufacturing a resin formwork according to the present invention includes a method of mounting a frame having a predetermined rigidity and having an anchor portion on the surface thereof, with a predetermined space therebetween. and filling resin so that the anchor portions are filled in the space formed in the frame mounting step and solidified to form a resin layer having a mold portion of a predetermined shape on the surface in contact with the molding die. and a molding step for molding integrally with the body.

Here, when the frame body is attached to the molding die by a frame body attachment step in which a frame body having a predetermined rigidity and having an anchor portion provided on the surface thereof is attached to the molding die with a predetermined space therebetween, the molding die and the frame body A space is formed between the surface on which the anchor portion of is provided.

In addition, resin is filled so that the anchor portions are filled in the space formed in the frame mounting step and solidified, and a resin layer having a mold portion of a predetermined shape on the surface in contact with the mold is molded integrally with the frame. In the molding process, the surface of the frame is covered with the resin filled in the space filling the anchor portions. As a result, the resin layer and the frame are engaged with each other through the anchor portions, so that a resin mold is formed in which the frame and the resin layer are firmly coupled by the anchor effect. At this time, a mold portion having a predetermined shape is formed on the surface of the resin layer that is in contact with the molding die. This mold part imitates the outer surface of a concrete product manufactured using a resin mold.

In addition, since the resin covering the surface of the frame having a predetermined rigidity is solidified, the shape of the resin layer formed by the solidification of the resin is supported by the frame, thereby suppressing deformation of the resin mold. be done. As a result, it is possible to give the resin formwork a predetermined strength, and to manufacture a resin formwork that is less likely to be damaged during use or transportation and has excellent durability. As used herein, the term "resin" refers to a material that has fluidity and solidifies after being mixed with a main agent, a curing agent, and talc and fibrous substances that promote bonding with these agents. Moreover, in the present invention, a resin layer is formed when the resin is solidified.

The present invention provides a resin formwork that is resistant to breakage and has excellent durability by imparting a predetermined strength to the resin formwork and suppressing the peeling of the resin layer from the frame during demolding, and the resin formwork. can provide a manufacturing method of

1 is a cross-sectional view of a resin formwork A according to an embodiment of the present invention; FIG. It is a perspective explanatory view of frame 1 concerning an embodiment of the invention. FIG. 3(a) is a perspective view of the anchor claw 12A. FIG. 3(b) is a perspective view of the anchor claw 12B. FIG. 3(c) is a perspective view of the anchor claw 12C. 1 is an exploded perspective explanatory view showing a state in which a frame body 1 and an outer frame B are combined in order to manufacture a resin formwork A according to an embodiment of the present invention; FIG. FIG. 5(a) is a cross-sectional view of the resin mold A housed in the outer frame D, and FIG. 5(b) is a cross-sectional view of the concrete product C. As shown in FIG. 4 is a flow chart showing a method for manufacturing a resin formwork A according to an embodiment of the present invention; It is a flowchart which shows the manufacturing method of the concrete product C which concerns on embodiment of this invention.

BEST MODE FOR CARRYING OUT THE INVENTION A resin mold A, a frame body 1 and a resin layer 2 of the present invention will be described below with reference to FIGS. 1 to 3 for understanding of the present invention.

[Regarding resin formwork A]
As shown in FIG. 1, the resin mold A has a two-layer structure of a frame 1 and a resin layer 2 covering the frame 1. It consists of a pedestal portion A2 provided on the side opposite to the opening edge portion A10 side.

The main body A1 is composed of a substantially square middle plate A11 and four support plates A12 connected from each side of the middle plate A11. formed in the shape of Specifically, the opening edge A10 of the resin mold A is formed to have a length of about 700 mm in the longitudinal direction and a width of about 500 mm, and the middle plate A11 has a length of about 660 mm in the longitudinal direction and a width of about 500 mm. It is formed to about 460 mm. The height of the resin mold A is about 420 mm.

A pedestal portion A2 is provided substantially in the center of the middle plate A11, and the middle plate A11 and the pedestal portion A2 are integrally formed. The pedestal A2 has a longitudinal length of about 555 mm, a width of about 355 mm, and a height of about 50 mm in plan view, and is smaller than the middle plate A11. As a result, a step is formed from the pedestal portion A12 to the intermediate plate A11.

[Regarding frame 1]
As shown in FIG. 2, the frame 1 is composed of a substantially box-shaped frame body 10 with an open bottom, and a pedestal 11 provided on the opposite side of the frame body 10 from the side of the opening edge 10a. The frame main body 10 is composed of a substantially square middle plate 10b and four support plates 10c connected from each side of the middle plate 10b, and is tapered from the middle plate 10b to the opening edge 10a. It is In addition, in this embodiment, the frame 1 is made of metal and has a predetermined rigidity necessary to maintain the shape of the resin formwork A. As shown in FIG.

Specifically, the longitudinal length of the opening edge 10a is approximately 660 mm and the width is approximately 460 mm, and the middle plate 10b is approximately 620 mm long and approximately 420 mm wide. The height of the frame 1 is approximately 400 mm, and the thickness of the plate members forming the intermediate plate 10b, the support plate 10c, and the base portion 11 of the frame 1 is approximately 3.2 mm.

A pedestal portion 11 is provided substantially in the center of the outer side surface 10b1 of the intermediate plate 10b, and the intermediate plate 10b and the pedestal portion 11 are integrally formed. The size of the pedestal 11 in a plan view is about 515 mm in length, about 315 mm in width, and about 30 mm in height, and is smaller than the middle plate 10b. Thus, a step is formed from the pedestal portion 11 to the intermediate step plate 10b.

Further, since the frame body 1 is made of metal and has a predetermined rigidity, the resin formwork A can be given a predetermined strength, so that the resin formwork can be made difficult to break. In addition, repeated use of the resin formwork A becomes possible.

Although the frame 1 is made of metal in this embodiment, it can also be made of stainless steel, wood, or reinforced plastic (including fiber-reinforced plastic). However, in order to give the frame 1 sufficient strength, it is desirable that it be made of metal. Also, metal includes iron, aluminum, and the like.

[Regarding resin layer 2]
The resin layer 2 is an example of a resin layer, and as shown in FIG. A thick coating is provided. On the surface of the resin layer 2 opposite to the surface covered with the frame 1, a mold surface 20 is formed to model the surface of the concrete product C when manufacturing the concrete product C, which will be described later. Note that the mold surface 20 is an example of a mold portion.

The resin layer 2 is formed by solidifying resin, and as described later, part of the resin before solidifying flows into the housing portion 123 of the anchor claw 12, which is an example of the engaging member. Further, the resin encloses the anchor claws 12 and covers the outer side surfaces 10c1, 10b1 and the outer side surface 11a of the frame 1. As shown in FIG.

When the resin is solidified in this state, the anchor claws 12, which are an example of the anchor portion, enter the inside of the resin layer 2, so that the frame 1 and the resin layer 2 are firmly coupled. As a result, the resin formwork is provided with a predetermined strength, and the peeling of the resin layer 2 from the frame body 1 is suppressed even if force is applied to the resin formwork A when releasing the resin formwork A from the mold. Therefore, it is possible to obtain a resin formwork A that is less likely to be damaged.

The resin layer 2 may be made of either a thermosetting resin or a thermoplastic resin. Since ready-mixed concrete is alkaline, it is desirable to have alkali resistance.

Moreover, the dimensions and shapes of the resin formwork, the frame, and the resin layer are not limited to those described above, and other dimensions and shapes can also be used.

[Regarding the anchor claw 12]
Anchor claws 12 are provided on the outer surface 10c1 of each support plate 10c. The anchor claw 12 is a long member having a substantially L-shaped cross section, and includes a rising plate 120 protruding from the outer surface 10c1, a corner portion 124 where the rising plate 120 is bent, and a corner portion 124 extending from the corner portion 124. A housing portion 123 capable of housing a portion of the resin layer 2 is formed between the extension plate 125 and the outer surface 10c1. The anchor claw 12 has a length of about 400 mm and a width of about 25 mm on each side. Two anchor claws 12 are arranged substantially horizontally on the outer surface 10c1 of each support plate 10c.

The rising plate 120 of the anchor claw 12 is fixed to the outer surface 10c1 by any means such as welding, and the extension plate 125 of the anchor claw 12 is positioned at a predetermined distance from the outer surface 10c1. As a result, an opening 122 is formed between the anchor claw 12 and the outer surface 10c1 through which resin (not shown) can flow. In addition, at the back of the opening 122, an accommodating portion 123 capable of accommodating the resin flowing from the opening 122 is provided.

That is, the resin flows into the housing portion 123 from the opening 122 and fills the housing portion 123 with the resin. When the resin is solidified in this state, the frame body 1 and the resin layer 2 are joined with the anchor claws 12 entering the resin layer 2 . As a result, when releasing the resin formwork A, even if force is applied to the resin formwork A, it is possible to suppress the peeling of the resin layer 2 from the frame body 1, so that the resin formwork is less likely to be damaged. be able to.

Resin has the property of shrinking when it solidifies, and depending on the degree of shrinkage, damage such as cracks may occur in the resin layer. Shrinkage can be easily suppressed, and it can be expected that the occurrence of cracks is suppressed.

In this embodiment, the anchor claws 12 provided on each support plate 10c are arranged in two stages, but the arrangement is not limited to this, and a plurality of stages may be employed. Further, the upper and lower positions of each anchor claw 12 are provided at approximately the same height as each of the other support plates 10c, but the present invention is not limited to this, and the anchor claw 12 can be placed at any position. can also be provided. Although the anchor claw 12 is a long member, it is not limited to this, and a short member may be used.

Further, the shape of the anchor claw is not limited to the above-described shape, and any shape may be provided as long as it has a concave portion into which resin can flow or a convex portion into which resin can adhere. A shape as shown in c) is also conceivable.

FIG. 3(a) is a perspective view of the anchor claw 12A. The anchor claw 12A is formed by arranging a plurality of claw pieces 120A as shown in the figure. The claw piece 120A includes a plate portion (reference numeral omitted) rising at right angles from the outer surface 10C1 of the support plate 10c and a plate portion parallel to the outer surface 10C1 connected via a curved portion formed by extending parallel to the outer surface 10C1. (reference numerals omitted), and has an L-shaped cross section and an L-shaped, U-shaped, or square-shaped shape.

That is, each claw piece 120A has an edge portion of the plate portion parallel to the outer surface 10C1, which is parallel to the edge portion of the plate portion parallel to the outer surface 10C1 of the other claw piece 120A arranged facing each other with a required gap. , and the anchor claws 12A are arranged in a lattice shape as a whole.

As a result, between each plate portion parallel to the outer surface 10C1 of each claw piece 120A and the outer surface 10C1, an accommodating portion 123A, which is a space portion, is formed along the arrangement direction of each claw piece 120A. becomes an opening 122A communicating with the accommodating portion 123A.

Here, the resin before solidification flows into the accommodating portion 123A from each opening 122A and fills the interior, and the resin further fills the anchor claws 12A and covers the entire outer surface 10c1 of the support plate 10c. As a result, the claw pieces 120A and 120A are solidified while biting the resin layer 2, so that the frame 1 and the resin layer 2 are firmly bonded. As a result, when releasing the resin formwork A, even if force is applied to the resin formwork A, it is possible to suppress the peeling of the resin layer 2 from the frame body 1, so that the resin formwork is less likely to be damaged. be able to.

The anchor claws 12A are provided on the support plate A12 of the frame 1 in such a manner that the receiving portions 123A of the plurality of anchor claws 12A communicate with each other. It is also possible. In this case, the anchor claws can be easily attached to the frame 1 .

FIG. 3(b) is a perspective view of an anchor claw 12B, which is an example of a projecting portion in which projecting portions having a substantially semicircular cross-sectional shape are arranged in two upper and lower stages. The resin adheres to the outer peripheral surface 120B of the anchor claw 12B and also flows into the gap 121B formed by the outer peripheral surface 120B and the outer surface 10c1 of the support plate 10c being adjacent to each other. Since the anchor claws 12B are encased in resin, the frame 1 and the resin layer 2 are firmly bonded together when the resin is solidified. As a result, when releasing the resin formwork A, even if force is applied to the resin formwork A, it is possible to suppress the peeling of the resin layer 2 from the frame body 1, so that the resin formwork is less likely to be damaged. be able to.

Also, FIG. 3(c) is a perspective view of a stud bolt 12C, which is an example of a convex portion, attached to the outer side surface 10c1 of each support plate 10c. Since the resin adheres to the surface of the stud bolt 12C and the stud bolt 12C is enclosed in the resin, the frame 1 and the resin layer 2 are strongly bonded together when the resin hardens. As a result, when releasing the resin formwork A, even if force is applied to the resin formwork A, it is possible to suppress the peeling of the resin layer 2 from the frame body 1, so that the resin formwork is less likely to be damaged. be able to.

Further, a recessed portion (not shown), which is an example of a recessed portion, can be provided on the outer surface 10c1 of each support plate 10c. In this case, part of the resin layer is accommodated in the recess, and the resin layer and the frame are integrally bonded. As a result, it is possible to prevent the resin layer from peeling off from the frame when the mold is released, so that the resin mold can be made less likely to be damaged.

[Regarding the manufacturing method of the resin formwork A]
A method for manufacturing the resin mold A will be described with reference to FIGS. 4 to 6. FIG.
As shown in FIG. 4, the resin mold A is manufactured using an outer frame B as a mold. The outer frame B has a substantially box-like shape with an open top, is about 808 mm long, 608 mm wide and about 500 mm high, and consists of four side plates B1 and a bottom plate B2.

(ST1; frame attachment step)
In the frame mounting step ST1, as shown in FIG. 4, with the opening edge 10a of the frame 1 facing up and the pedestal 11 facing down, the side plate B1 and the bottom plate B2 of the outer frame B are separated by at least about 20 mm. The frame body 1 is accommodated in the outer frame B while keeping the separation distance.

In addition, at substantially the center of the bottom plate B2 of the outer frame B, a bottom recessed portion B21 recessed from the peripheral edge portion B20 of the bottom plate B2 is provided. The pedestal portion 11 of the frame 1 is accommodated at a distance of about 20 mm from the bottom recessed portion B21. At this time, the opening edge portion 10a of the frame 1 and the opening edge portion B22 of the outer frame B are positioned substantially on the same plane. A space S is formed between the frame 1 and the outer frame B. As shown in FIG. This space S is filled with resin (not shown) as described later.

(ST2; molding process)
Resin is poured into the space S formed in the frame mounting step ST1. At this time, the resin fills the bottom recessed portion B21 and the peripheral portion B20 in the lower portion of the space S, and gradually rises while enveloping the pedestal portion 11 of the frame 1 . It also rises while being in contact with the outer surface 10b1 of the middle plate 10b of the main body 10 and the outer surface 10c1 of the support plate 10c.

At this time, the opening 122 of the housing portion 123 is opened upward, and the resin flows into the housing portion 123 from the opening 122 to fill the inside of the housing portion 123 with the resin. Then, the resin fills the housing portion 123 and gradually rises while enveloping the anchor claw 12 and reaches the opening edge portion 10a.

Further, the resin filled in the space S is solidified in a state in which it flows into the accommodation portion 123 of each anchor claw 12 . Since the frame body 1 is made of metal and has a predetermined rigidity, the resin formwork A can be given a predetermined strength, so that a resin formwork which is hard to break is molded. At this time, the inner surface of the resin mold A is modeled by the frame 1, and the outer surface of the resin mold A is modeled by the outer frame B.

After confirming that the resin has solidified in the molding step ST2, the resin mold A is taken out from the outer frame B. As shown in FIG. At this time, since the frame 1 and the resin layer 2 are firmly connected by the anchor members 12, when the resin formwork A is released from the mold, even if force is applied to the resin formwork A, the resin layer 2 does not adhere to the frame body. Since it is possible to suppress peeling from 1, it is possible to obtain a resin mold that is less likely to be damaged. By applying a release agent to the inside of the formwork B, the resin formwork A can be easily removed from the outer frame B.

It is also conceivable to provide anchor claws on the inner surface of the frame and provide the resin layer inside the frame. In this case, a resin mold having the same function is manufactured by the following steps (not shown).

(Frame mounting process)
A frame having an anchor part on its inner surface is arranged with the opening edge facing upward, and the inner frame is accommodated and fixed in the frame so as to form a required space between its outer surface and the inner surface of the frame. . At this time, the opening edge of the inner frame has substantially the same height as the opening edge of the frame.

(Molding process)
A resin is poured into the space formed between the frame and the inner frame, and the resin rises in the space so as to fill the anchor portion and reaches the opening edge of the frame. When the resin hardens in this state, a resin form is obtained in which the resin layer is firmly fixed to the inner surface of the frame by an anchor effect and has a mold portion on the inner surface.

[Method for producing concrete product C]
A method for manufacturing the concrete product C will be described with reference to FIGS.
A concrete product C is manufactured using an outer frame D and a resin formwork A, as shown in FIG. 5(a). The outer frame D is open at the top, and the inner dimensions of the opening D3 are about 800 mm in length, 600 mm in width, and about 450 mm in depth, and consists of four side plates D1 and a bottom plate D2. The side plate D1 is attached to the bottom plate D2 so as to be openable and closable, as shown in FIG. 5(a).

(st1; resin mold housing step)
As shown in FIG. 5(a), with the opening edge A10 of the resin mold A facing downward and the pedestal A2 facing upward, the side plate D1 and the bottom plate D2 of the outer frame D are separated from each other by at least about 30 mm. The resin formwork A is accommodated in the outer frame D in an upside-down state while keeping the same.

Specifically, the opening edge A10 of the resin mold A is accommodated in contact with the bottom plate D2 of the outer frame D, and a space S' is formed between the frame 1 and the outer frame D. . This space S' is filled with ready-mixed concrete (not shown).

(st2; ready-mixed concrete filling step)
Ready-mixed concrete is poured into the space S' formed in the resin mold housing step st1. At this time, the ready-mixed concrete fills the vicinity of the bottom plate D2 in the lower part of the space S' and gradually rises while enclosing the resin formwork A. Further, while being in contact with the outer surface of the support plate A12 of the main body A1, it further rises and reaches the opening edge D3 of the outer frame D. As shown in FIG.

(st3; Concrete product forming process)
As shown in FIG. 5(b), in the fresh concrete filling step st2, the fresh concrete filled in the space S' is solidified to form a concrete product C. As shown in FIG. The inner surface of the concrete product C is modeled by the resin mold A, and the outer surface of the concrete product C is modeled by the outer frame D.

(st4; Concrete product removal process)
In the concrete product forming step st3, after confirming that the ready-mixed concrete has solidified, the side plate D1 is rotated to expose the concrete product C and remove it from the outer frame D. At this time, since the frame 1 and the resin layer 2 are firmly connected by the anchor members 12, when the resin formwork A is released from the mold, even if force is applied to the resin formwork A, the resin layer 2 does not adhere to the frame body. Since it is possible to suppress peeling from 1, it is possible to obtain a resin mold that is less likely to be damaged. By applying a release agent to the inside of the outer frame D, the concrete product C can be easily removed from the outer frame D.

The concrete product C can be used as a gutter water collecting basin, but the concrete product is not limited to this shape and other dimensions and shapes are possible.

As described above, the resin mold and the method for manufacturing the resin mold according to the present invention provide the resin mold with a predetermined strength and suppress the peeling of the resin layer from the frame during demolding. It is a resin mold that is hard to break and has excellent durability, and a method for manufacturing the resin mold.

1 frame body 10 frame main body 10c1 outer surface (surface)
12 anchor claw (anchor part)
2 Resin layer 20 Mold part A Resin mold B Outer frame S1 Frame mounting process S2 Molding process S Space

Claims (7)

a frame having a predetermined rigidity;
an anchor portion provided on the outer surface of the frame and forming a predetermined accommodating portion capable of accommodating a resin between the outer surface and the outer surface;
and a resin layer having a mold portion of a predetermined shape provided covering the outer surface so as to fill the anchor portion and be accommodated in the accommodation portion . The resin formwork according to claim 1, wherein the frame is made of any one of metal, wood, and reinforced plastic. A plurality of the anchor portions are provided, and the accommodation portion is formed by bending or curved curved portions of the anchor portions, and the extending directions of the curved portions are arranged so as to intersect each other.
The resin formwork according to claim 1 or 2. The accommodating portion is a gap portion formed so as to narrow in a direction in which the outer peripheral surface of the convex portion having a substantially semicircular cross-sectional view and the outer surface are stepped and arranged on the outer surface.
The resin formwork according to claim 1 or 2. The accommodating portion is a small-diameter portion formed on a plurality of convex portions protruding from the outer surface.
The resin formwork according to claim 1 or 2. The accommodating portion is a recessed portion that is recessed from the outer surface.
The resin formwork according to claim 1 or 2. a frame attachment step of attaching a frame having a predetermined rigidity and having anchor portions on the outer surface thereof to the molding die with a predetermined space therebetween;
By filling resin so that the anchor portion is filled in the space formed in the frame mounting step, the resin is housed in the housing portion formed between the anchor portion and the outer surface. and a molding step of coating the outer surface with the resin, and then solidifying the resin layer to integrally mold the resin layer having the mold section modeled by the molding die with the frame body.

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