JP7632838B2 - Structure for retaining embedded members in formwork for manufacturing precast concrete products and method for attaching embedded members - Google Patents

Description

The present invention relates to an embedding member holder and an embedding member installation method in a formwork for manufacturing precast concrete products, and relates to, for example, a holder used to embed an embedding member such as an insert (hereinafter, an insert is also a representative example of an embedding member) inside a shield segment, and a method for installing an embedding member inside a shield segment.

In typical forms for manufacturing precast concrete products, the embedded members are bolted from the back of the form. However, in cases such as shield segments where it is difficult to operate the form from the back (where it is difficult to bolt the embedded members), plastic bolts are used to secure the embedded members from the inside of the form, and by breaking the plastic bolts when the shield segment is removed, it is possible to install the embedded members inside the shield segment without removing the plastic bolts. These plastic bolts are generally provided with weak parts to make them easier to break.

As such, various techniques have been disclosed for fixing embedded members to formwork when manufacturing precast concrete products (see Patent Documents 1 to 3). The technique described in Patent Document 1 involves attaching a fixture made of an elastic material such as rubber or soft resin to a hole in the formwork, and forcing the fixture into the cylindrical portion (female thread portion) of the embedded member nut, thereby fixing the embedded member to the formwork. Then, when the formwork is opened, the fixture comes off the embedded member nut and the product can be removed from the formwork.

In the technology described in Patent Document 2, a mounting fixture consisting of a nylon resin boss and bolt is inserted into a bolt hole in the formwork, and then fastened and fixed with a nut from the back of the formwork, and attached to the formwork with the boss protruding from the inner surface of the formwork. To attach the embedding member to the formwork, the embedding member is held in the hand and pressed into the boss protruding from the inner surface of the formwork. With this technology, the embedding member is held by two members, the boss and the base, so it is resistant to the vibrations of the vibrator and the embedding member will not fall out, and when the formwork is opened, it can be easily removed without removing the mounting fixture from the formwork.

In the technology described in Patent Document 3, an embedding member for embedding in a concrete product has an embedding portion that is embedded in the concrete product and an exposed portion that is exposed from the concrete product. The exposed portion has a horizontal hole for passing a connecting member such as a bolt that connects it to another member. Then, when the embedding member is set in the formwork and the part of the cam with the large eccentric distance is moved by rotating the shaft, the L-shaped lever rotates due to the elasticity of the spring connecting the two, and with the locking portion engaged with the horizontal hole of the exposed portion, the elastic pressure of the spring is applied, and the embedding member is fixed to the inner surface of the formwork. When the locking portion is disengaged from the horizontal hole of the exposed portion, the embedding member is released from the formwork.

A technology has also been disclosed in which a weak part is provided in a member embedded inside a concrete product, and the embedded member is removed by breaking the weak part when the product is removed (see Patent Document 4). This technology relates to a form holder that maintains a constant gap inside the form when assembling a concrete form. The auxiliary cone used in the form holder has a truncated cone shape integrally molded from synthetic resin, and is composed of a semi-frustum shell-shaped member that is split in two on its axis. To attach the auxiliary cone to the form holder, the two halves of the member are opened and wrapped around the form receiving piece to form an integrated unit.

This allows the formwork support piece to fit inside the opening, and the tip of the annular protrusion is held loosely in the breaking groove. When the formwork is dismantled after the concrete has hardened, the formwork support piece and auxiliary cone remain in the concrete, and the end of the separator, including the threaded portion, protrudes from the surface of the concrete. When a bending pipe is inserted into the threaded portion and twisted, the protruding end of the separator breaks at the bending groove, allowing it to be removed together with the formwork support piece.

Japanese Patent Application Publication No. 6-81482 Japanese Patent Application Publication No. 7-216996 Japanese Patent Application Publication No. 7-233631 Japanese Utility Model Application Publication No. 5-83198

However, when concrete is poured into a formwork containing embedded members fixed to the formwork using plastic screws, the embedded members may come into contact with a vibrator, causing the plastic bolts to break and the embedded members to fall over. When this happens, the concrete product is defective because the embedded members are not embedded in the designated positions, and the product cannot be shipped.

In addition, if steel bolts are used as retainers for embedded components such as inserts, the embedded components will not fall over. However, plastic bolts have the advantage that they break when the mold is removed, making it unnecessary to remove the bolts. In contrast, when steel bolts are used, the extra work of removing the bolts when the mold is removed is required, resulting in poor work efficiency.

In particular, with large embedded components, the force that tries to topple the embedded component acts on the plastic bolt is large, increasing the risk of the embedded component falling over. For example, if the embedded component is reinforcing bar-shaped and has a large diameter, the overall length of the embedded component will also be long, further increasing the risk of the embedded component falling over.

Furthermore, if a sufficient working area cannot be secured below the formwork, it becomes difficult to attach the holder, for example by crawling under the formwork to perform the work. Thus, even in the case of a formwork to which it is difficult to attach a holder for the embedded members, it is preferable to use a plastic bolt that can be broken when the embedded members are removed as the holder for the embedded members, and to have a structure that can reliably hold the embedded members even if it comes into contact with a vibrator or the like used to compact the poured concrete.

The prior art, including the technologies described in the above-mentioned patent documents, does not disclose any embedded member holder or embedded member holding method having such a structure.

The present invention has been proposed in light of the above-mentioned circumstances, and aims to provide an embedded member holding structure and an embedded member installation method in a formwork for manufacturing precast concrete products, which allows the embedded member to be easily attached to the formwork, can securely hold the embedded member until the concrete product is demolded, and further allows the retainer to be easily removed when demolding.

The embedded member holding structure and embedded member installation method in the manufacturing formwork for precast concrete products according to the present invention (hereinafter sometimes abbreviated as embedded member holding structure (insert holding structure) and embedded member installation method (insert installation method)) have the following features in order to achieve the above-mentioned objectives. Note that the embedded member refers to, for example, an insert, but also includes grout injection ports and the like.

The embedded member retaining structure of the present invention is a retaining structure for holding an embedded member in a formwork for manufacturing precast concrete products, and is characterized in that it comprises an embedded member mounting hole provided at the embedded member mounting position of the formwork, an embedded member holder having an outer peripheral shape that gradually narrows in diameter from the inside to the outside of the formwork, an embedded member fixing device that is attached to the embedded member mounting hole and has an inner peripheral shape that matches the outer peripheral shape of the embedded member holder and attaches and fixes the embedded member holder to the formwork with the embedded member holder fitted inside, a connecting device that connects the embedded member holder and the embedded member fixing device and has a weak part that breaks when an external force greater than a predetermined value is applied, and a connecting part that is provided between the embedded member and the embedded member holder and connects the two together.

The inside of the formwork refers to the side where concrete is poured, and the outside of the formwork refers to the outside of the formwork where concrete is not poured. In addition, the embedded member holder has an outer periphery that gradually narrows in diameter from the inside of the formwork to the outside of the formwork, so the inside of the formwork is the expanded diameter part and the outside of the formwork is the reduced diameter part.

In the above-mentioned embedment member holding structure, the inner peripheral surface of the embedment member fixing device and the outer peripheral surface of the embedment member holding device can be configured to be cone-shaped and in contact with each other.

The embedding member has a female threaded portion at the end opposite the embedding member holder for attaching the embedding member holder, the connector has a male threaded portion on its outer circumferential surface and a weak portion midway along its length, the embedding member holder has a male threaded portion at the end opposite the embedding member for screwing into the embedding member, and a female threaded portion at a reduced diameter portion located on the outside of the formwork for screwing in the male threaded portion of the connector, the female threaded portion on the embedding member and the male threaded portion on the embedding member holder form a connector that connects the two, and the embedding member fixing device can have a female threaded portion for screwing in the male threaded portion of the connector.

The connector can also be configured to have a flange located between the embedding member holder and the embedding member fixing device, with the weak portion being provided near one side of the flange.

The embedding member mounting method according to the present invention is a method for holding and mounting an embedding member in a formwork for manufacturing a precast concrete product, and includes the steps of providing an embedding member mounting hole at an embedding member mounting position in the formwork, mounting an embedding member fixing device to the formwork so as to match the embedding member mounting hole, connecting the embedding member and the embedding member holding device, fitting the embedding member fixing device into the embedding member fixing device, and connecting the embedding member holding device and the embedding member fixing device with a connector having a brittle part that breaks when a predetermined external force or more is applied, thereby fixing the embedding member holding device connected to the embedding member to the formwork. The embedding member holding device has an outer peripheral shape that gradually decreases in diameter from the inside to the outside of the formwork, and the embedding member fixing device has an inner peripheral shape that matches the outer peripheral shape of the embedding member holding device .

In the embedded member holding structure and embedded member installation method having the above-mentioned configuration, the embedded member can be an insert.

According to the embedding member holding structure and embedding member mounting method of the present invention, the structure for mounting the embedding member to the formwork uses an embedding member mounting hole provided in the formwork, an embedding member holder for holding the embedding member, and an embedding member fixing device for mounting the embedding member holder to the formwork, and the embedding member holder and embedding member fixing device are embedded in the formwork, and the embedding member holder and embedding member fixing device are connected using a connector having a fragile part that breaks when a predetermined external force or more is applied.

Therefore, even if the vibrator comes into contact with the embedded member when pouring concrete into the formwork, the embedded member can resist external lateral forces and will not fall over because the embedded member holder and embedded member fixing device are embedded in the formwork. In other words, the embedded member holder embedded in the embedded member fixing device resists horizontal forces that would topple the embedded member while pouring concrete, reducing the force that would break the connector (plastic bolt).

In addition, when the precast concrete product is removed from the formwork, a tensile force acts on the connector (plastic bolt) connecting the embedment member holder and embedment member fixing device, and the embedment member holder embedded in the embedment member fixing device does not resist the tensile force, and the connector (plastic bolt) breaks at the weak part, making it easy to remove from the formwork.

The embedded member retention structure and embedded member installation method of the present invention achieve the above-mentioned effects, and therefore can reliably hold embedded members against the formwork when pouring concrete, even for large embedded members, and can be easily removed from the precast concrete product.

In addition, even if there is no free space outside the formwork and it is difficult to attach the embedding member holder to the formwork using normal methods, the embedding member can be easily attached to the formwork.

The embedding member, embedding member holder, and embedding member fixing device are each connected by a screw structure, so in this respect too, the embedding member can be easily attached to the formwork. After demolding, the embedding member and embedding member holder can be easily detached.

1 is a vertical cross-sectional view showing an embedding member holder, an embedding member fixing device, and a connecting device used in an embedding member holding structure and an embedding member mounting method according to an embodiment of the present invention, attached to a formwork. 1A is a schematic vertical cross-sectional view and FIG. 1B is a bottom view of an embedding member holder and a connector used in an embedding member holding structure and an embedding member mounting method according to an embodiment of the present invention. 1A to 1C are schematic diagrams of an embedding member, an embedding member holder, and a connector used in an embedding member holding structure and an embedding member mounting method according to an embodiment of the present invention. 4 is a flowchart showing the steps of a method for attaching an embedded member according to an embodiment of the present invention.

The embedded member holding structure and embedded member mounting method according to an embodiment of the present invention will be described below with reference to the drawings. Figures 1 to 4 explain the embedded member holding structure and embedded member mounting method according to an embodiment of the present invention, with Figure 1 being a vertical cross-sectional view showing an insert holder (embedded member holder), an insert fixing device (embedded member fixing device), and a connector mounted to a formwork, Figure 2 being a vertical cross-sectional schematic view and a bottom view of the insert holder (embedded member holder) and connector, Figure 3 being a schematic view of the insert (embedded member), insert holder (embedded member holder), and connector, and Figure 4 being a flow chart showing the steps of the insert mounting method (embedded member mounting method).

<Outline of embedded member holding structure>
In the following description, an insert will be taken as an example of a typical embedding member, but the present invention can also be applied to embedding members such as grout injection ports in addition to inserts. An insert holding structure (embedded member holding structure) according to an embodiment of the present invention is a structure for holding an insert (embedded member) in a formwork for manufacturing a precast concrete product, and includes, as main components, an insert holder (embedded member holder) for holding the insert (embedded member), an insert fixing device (embedded member fixing device) for fixing the insert holder (embedded member holder) to the formwork, and a connecting device for connecting the insert holder (embedded member holder) and the insert fixing device (embedded member fixing device).

The present invention can be applied to the manufacture of precast concrete products for various applications, such as shield segments, culverts, and floor panels. Shield segment inserts are used for suspending belt conveyors, attaching electrical cable racks, attaching ventilation fans, attaching guide plates, etc., and the present invention can be particularly suitably applied to inserts with large diameters (e.g., diameters of 20 mm to 22 mm) and long lengths (e.g., lengths of 150 mm).

<Formwork>
Although not shown, the formwork includes, for example, a bottom plate, side plates rising from the periphery of the bottom plate, and a top plate that is attached to the top surface of the formwork to seal the formwork. The upper part above the bottom plate is the inside side of the formwork, and the back surface (lower surface) of the bottom plate and the outer surfaces of the side plates are the outside sides of the formwork. In addition, the bottom plate of the formwork 50 of this embodiment is provided with an insert mounting hole 51 at a position where the insert 10 is to be mounted. As will be described in detail later, an insert fixing device 30 is attached to the back surface of the bottom plate of the formwork 50, facing the insert mounting hole 51.

<Insert>
The insert 10, which is the embedded member of this embodiment, is larger in diameter and longer than a general insert 10. The present invention can be applied not only to such a large-diameter and long insert 10, but also to a general insert 10. As shown in Fig. 3, the insert 10 uses, for example, a deformed steel bar (deformed reinforcing bar), which is a rod-shaped steel material having uneven protrusions called "ribs" or "nodes" on its surface.

The insert 10 has a female threaded portion 11 for mounting the insert holder 20 on the end side facing the insert holder 20. In this embodiment, a mounting hole is drilled along the length of the deformed steel bar, and the female threaded portion 11 is provided inside this mounting hole.

<Insert holder>
1 to 3, the insert holder 20 has an outer peripheral shape that gradually reduces in diameter from the inside of the mold 50 toward the outside of the mold 50. In this embodiment, the inner peripheral surface of the insert fixing tool 30 and the outer peripheral surface of the insert holding tool 20 are cone-shaped and in contact with each other. Since the inner peripheral surface of the insert fixing tool 30 and the outer peripheral surface of the insert holding tool 20 have such shapes, positioning of the insert holding tool 20 can be easily performed when fitting it into the insert fixing tool 30.

That is, for example, when the inner peripheral surface of the insert fixing tool 30 is cylindrical and the insert holder 20 is columnar, accurate positioning is required when fitting the insert holder 20 inside the insert fixing tool 30. On the other hand, when the inner peripheral surface of the insert fixing tool 30 and the outer peripheral surface of the insert holder 20 are cone-shaped in contact with each other, if a part of the outer peripheral surface of the insert holder 20 contacts any position of the inner peripheral surface of the insert fixing tool 30, the outer peripheral surface (the inclined surface that reduces in diameter) of the insert holding tool 20 is guided to the inner peripheral surface (the inclined surface that reduces in diameter) of the insert fixing tool 30, and the position is automatically adjusted, so that the insert holding tool 20 can be easily fitted inside the insert fixing tool 30.

The insert holder 20 is provided with a retaining male screw portion 21 at the end side (expanded diameter end) facing the insert 10 for screwing into the retaining female screw portion 11 of the insert 10. The insert holder 20 of this embodiment is provided with a protrusion 22 at the end side (expanded diameter end) facing the insert 10 for insertion into the interior of a mounting hole drilled inside the insert 10, and the outer peripheral surface of this protrusion 22 is provided with a retaining male screw portion 21 that matches the retaining female screw portion 11 provided in the mounting hole drilled in the insert 10. This allows the insert 10 and the insert holder 20 to be connected.

The insert holder 20 has a mounting hole in the reduced diameter section located on the outside of the formwork 50 for inserting the connector 40, and a first connecting female thread section 23 that matches the connecting male thread section 41 of the connector 40 is provided inside the mounting hole. This allows the connector 40 to be attached to the insert holder 20.

Furthermore, the insert holder 20 has a notch 24 in the reduced diameter portion located on the outside of the mold 50 for engaging a tool such as a wrench. When attaching or detaching the insert holder 20 to or from the insert 10, the insert holder 20 can be easily attached or detached from the insert 10 by engaging a tool such as a wrench with this notch 24 and manipulating (rotating) the insert holder 20.

<Insert Fixture>
1, the insert fixing tool 30 has an inner peripheral shape that matches the outer peripheral shape of the insert holder 20, and is a member for attaching and fixing the insert holder 20 to the formwork 50 with the insert holder 20 fitted inside. The insert fixing tool 30 is box-shaped with an open top and a mounting hole for the connector 40 provided on the bottom surface, and is attached to the back surface of the bottom plate of the formwork 50 facing the insert mounting hole 51.

To attach the insert fixture 30 to the bottom plate of the formwork 50, the inner diameter expansion side of the insert fixture 30 (the side where the insert holder 20 is inserted) is inserted into the insert attachment hole 51 toward the inner surface of the formwork 50. At this time, the end (upper end surface) of the inner diameter expansion side of the insert fixture 30 and the inner peripheral surface of the bottom plate of the formwork 50 are at the same height (flush). Then, the outer peripheral surface of the insert fixture 30 and the outer surface of the bottom plate of the formwork 50 are welded together. Note that the method of attaching the insert fixture 30 to the bottom plate of the formwork 50 is not limited to welding, and adhesives, etc. may also be used.

As described above, the inner peripheral surface of the insert fixing device 30 and the outer peripheral surface of the insert holding device 20 are cone-shaped and in contact with each other, which makes it easy to position the insert holding device 20 when fitting it inside the insert fixing device 30.

The insert fixing device 30 has a mounting hole on its bottom surface, and a second connecting female thread 31 is provided on the inner surface of the mounting hole for screwing in the connecting male thread 41 of the connecting device 40. The insert fixing device 30 and the insert holding device 20 can be connected by screwing one end of the connecting male thread 41 of the connecting device 40 into the first connecting female thread 23 of the insert holding device 20, and screwing the other end of the connecting male thread 41 of the connecting device 40 into the second connecting female thread 31 of the insert fixing device 30.

<Connector>
1 to 3, the connector 40 connects the insert holder 20 and the insert fastener 30, and is a rod-shaped member having a fragile part 42 that breaks when a predetermined external force or more is applied, and is made of, for example, polypropylene, polyethylene, etc. As shown in Fig. 3, the connector 40 has a male threaded part 41 on its outer circumferential surface, and has the fragile part 42 midway along its length.

As shown in FIG. 3, the connector 40 of this embodiment has a flange 43 located between the insert holder 20 and the insert fixing device 30, and the fragile portion 42 is provided near one side of the flange 43. The flange 43 has a larger diameter than the mounting holes of the connector 40 provided in the insert holder 20 and the insert fixing device 30.

As described above, one end of the connecting male threaded portion 41 provided on the connector 40 is screwed into the first connecting female threaded portion 23 provided on the insert holder 20, and the other end of the connecting male threaded portion 41 provided on the connector 40 is screwed into the second connecting female threaded portion 31 provided on the insert fixture 30, thereby connecting the insert fixture 30 and the insert fixture 20. Since the flange portion 43 has a larger diameter than the mounting holes of the connector 40 provided on the insert holder 20 and the insert fixture 30, the connector 40 is divided into two sides, the insert holder 20 side and the insert fixture 30 side, sandwiched by the flange portion 43. Furthermore, because the weak portion 42 is located near one side of the flange portion 43, when the connector 40 breaks from the weak portion 42 during demolding of the precast concrete product, the broken portion is located near the boundary between the insert holder 20 and the insert fixing device 30, so the connector 40 can be easily removed from the insert holder 20 and the insert fixing device 30.

<Connection between insert and insert holder>
A connecting portion for connecting the insert 10 and the insert holder 20 is provided between them. In this embodiment, the connecting portion for connecting the insert 10 and the insert holder 20 is constituted by the retaining female screw portion 11 provided on the insert 10 and the retaining male screw portion 21 provided on the insert holder 20.

<How to attach the insert to the formwork>
The form 50 can be divided into a plurality of components (plate-like members), and each component can be assembled to form a box-like form 50. The components can be assembled, for example, by integrating the components using a hinge mechanism provided on the opposing components, or by fitting a fastener (bolt) provided on one component into a fastening groove provided on the other component and tightening a nut on the fastener (bolt).

In this embodiment, the insert 10 is attached and fixed to the inside of the formwork 50 (bottom plate). Once the assembly of the formwork 50 is complete, a release agent is applied to the inner surface of the formwork 50 to facilitate demolding, and then concrete is poured and compacted using a vibrator. Then, after a specified curing period has elapsed, the formwork is demolded.

In the method of mounting the insert in this embodiment, as shown in FIG. 4, the insert fixing device 30 is attached so as to match the insert mounting hole 51 provided in the formwork 50 (bottom plate) (S1). The insert 10 and the insert holder 20 are then connected (S2), the insert holder 20 is fitted into the insert fixing device 30 (S3), and the insert holder 20 and the insert fixing device 30 are connected using a connector 40 having a fragile portion 42 that breaks when a predetermined external force or more is applied (S4). This allows the insert holder 20 connected to the insert 10 to be fixed to the formwork 50.

The step of connecting the insert 10 and the insert holder 20 (S2), the step of fitting the insert holder 20 into the insert fixing device 30 (S3), and the step of connecting the insert holder 20 and the insert fixing device 30 (S4) do not necessarily have to be performed in this order, and can be performed in a different order depending on the shape and structure of the insert 10 (embedded member).

<Removal from mold>
After pouring concrete into the formwork 50 and curing it for a predetermined period of time, the precast concrete product can be demolded by disassembling the formwork 50. At this time, a tensile force is applied to the connector 40 connecting the insert holder 20 and the insert fixing device 30, so that the connector 40 breaks at the weak portion 42, and the precast concrete product can be easily demolded with the insert 10 remaining in the precast concrete product.

Once demolding is complete, the insert holder 20 is removed from the insert 10, leaving the insert 10 embedded in the precast concrete product. In addition, the insert holder 20 and the insert fixing device 30 can be reused by removing the connectors 40 that remain on the insert holder 20 and the insert fixing device 30.

REFERENCE SIGNS LIST 10 Insert 11 Retaining female thread portion 20 Insert retainer 21 Retaining male thread portion 22 Projection portion 23 First connecting female thread portion 24 Notch portion 30 Insert fixing device 31 Second connecting female thread portion 40 Connector 41 Connecting male thread portion 42 Weak portion 43 Flange portion 50 Formwork 51 Insert mounting hole

Claims (6)

A retaining structure for retaining an embedded member in a form for producing a precast concrete product, comprising:
An embedding member mounting hole provided at a position where the embedding member is to be mounted on the formwork;
an embedment member holder having an outer peripheral shape whose diameter gradually decreases from the inside to the outside of the formwork;
an embedding member fixing device that is attached to the embedding member mounting hole, has an inner peripheral shape that matches an outer peripheral shape of the embedding member holder, and is attached and fixed to a formwork in a state in which the embedding member holder is fitted inside;
a connector that connects the embedment member holder and the embedment member fixing device and has a fragile part that breaks when a predetermined external force or more is applied;
a connecting portion provided between the embedding member and the embedding member holder and connecting the two;
1. A structure for retaining embedded members in a formwork for manufacturing precast concrete products, comprising: The inner peripheral surface of the embedment member fixing tool and the outer peripheral surface of the embedment member holding tool are in contact with each other to form a cone shape.
2. The method of claim 1, wherein the precast concrete product is formed by a precast concrete structure. the embedding member has a female screw portion for attaching the embedding member holder at an end side facing the embedding member holder,
The connector has a male thread on its outer circumferential surface and a fragile portion midway along its length,
The embedding member holder has a male screw portion for screwing into the embedding member at an end side facing the embedding member, and has a female screw portion for screwing into the male screw portion of the connector at a reduced diameter portion located on the outer side of the formwork,
a female screw portion provided on the embedding member and a male screw portion provided on the embedding member holder constitute a connecting portion that connects the two together,
The embedding member fixing device has a female thread portion into which the male thread portion of the connecting device is screwed.
3. A structure for retaining embedded members in a formwork for manufacturing precast concrete products according to claim 1 or 2. the connector has a flange portion located between the embedment member holder and the embedment member fixing device, and the fragile portion is provided near one side of the flange portion;
4. A structure for retaining embedded members in a formwork for manufacturing precast concrete products according to claim 1. The embedding member is an insert.
5. A structure for retaining embedded members in a formwork for manufacturing precast concrete products according to any one of claims 1 to 4. 1. A method for mounting an embedment member to a form for manufacturing a precast concrete product, comprising:
providing an embedding member mounting hole at a mounting position of the formwork for the embedding member;
a step of attaching an embedment member fastener to the formwork so as to match the embedment member attachment hole;
connecting the embedding member and an embedding member holder ;
fitting the implant member holder into the implant member fastener;
a step of connecting the embedment member holder and the embedment member fixing device using a connector having a fragile portion that breaks when a predetermined external force or more is applied, thereby fixing the embedment member holder connected to the embedment member to the formwork;
Including,
A method for installing embedded members in a formwork for manufacturing precast concrete products, characterized in that the embedded member holder has an outer peripheral shape that gradually narrows from the inside to the outside of the formwork, and the embedded member fixing device has an inner peripheral shape that matches the outer peripheral shape of the embedded member holder.

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