JPH0220325Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an insert buried in a concrete wall, and more specifically, a nail removal method that allows the nails used to fix the insert to the formwork to be removed after the formwork is removed. The present invention relates to an insert having a structure.

(Prior Art) Conventionally, inserts buried in concrete walls have been fixed by nailing them to formwork.
In this case, when concrete is poured and the insert is buried, and the formwork is then removed, the tips of the nails driven into the formwork remain protruding from the concrete wall surface. For this reason,
Conventionally, the protruding part of the nail was bent with pliers or cut off with a nipper, but rust from the nail remaining in the concrete wall caused stains on the concrete wall surface, causing the wall surface to deteriorate. It often spoiled the appearance.

(Purpose) The present invention provides an insert in which the nails used to fix the insert to the formwork can be removed after the formwork is removed, so that no nails are left protruding from the concrete wall surface after the formwork is removed. It is an object.

(Structure) The insert having a nail removal structure according to the present invention consists of an insert main body and a seat removably attached to the lower part of the insert main body, and has a nail insertion hole for fixing the insert to the formwork, The nail insertion part that forms this nail insertion hole is divided so as to divide the nail insertion hole in the axial direction, one of the divided parts is provided in the insert body, the other divided part is provided in the catch seat, and the catch seat is attached to the insert body. It is characterized by forming a cavity from which the nail can be removed by pulling it out. In other words, when fixing the insert to the formwork, both the insert body and the seat are securely fixed to the formwork by inserting a nail into the nail insertion part, then the insert is buried in concrete, and the formwork is removed. After that, by pulling out the catch from the insert body, the other divided part of the nail insertion portion provided on the catch comes out together with the catch, and a void is formed. The nail inserted into the nail insertion portion is tilted toward this space, and the nail is extracted from the space and removed.

The present invention will be described below with reference to embodiments shown in the drawings.

The insert shown in FIGS. 1 and 2 consists of an insert body 1 made of synthetic resin and a seat 5 attached to the lower part of the insert body 1.

The insert body 1 has an insertion hole 2 into which a hanging bolt is inserted, and a nut into which the hanging bolt is screwed is housed in the upper part of the insertion hole 2. Numeral 4 is a nail insertion portion that forms a nail insertion hole through which a nail for fixing the insert to the formwork is inserted. The nail insertion part 4 is divided so as to divide the nail insertion hole in the axial direction, and one of the divided parts is provided in the insert body 1,
The other divided part is provided on the catch seat 5. Therefore, as shown in FIG. 3, the nail insertion portion 4 forms a nail insertion hole into which the nail 14 can be inserted when the seat 5 is attached to the insert body 1. Further, the nail head 14a of the nail 14 inserted into the nail insertion part 4 is locked at the upper part of the nail insertion part 4. In this example, the nail head 14a of the nail 14 inserted into the nail insertion part 4 is fitted into and locked in recesses 4a and 4b formed in the upper part of the nail insertion part 4. Note that the shape of the nail insertion hole does not matter, and the position where the nail insertion hole is divided in the axial direction does not have to be at the center of the nail insertion hole as in the embodiment.

When the insert main body 1 and the catch seat 5 are separated, a space 10 is formed next to one nail insertion part 4 provided on the insert main body 1 side, and a space 10 is formed beside the nail insertion part 4 provided on the insert main body 1 side, and the other nail provided on the catch seat 5 side The insertion portion 4 serves as a void filling member 6 that fills the void 10.

The nail 14 inserted into the nail insertion part 4 can be tilted into this cavity 10, and furthermore, the nail 14 can be extracted from this cavity 10. Therefore, the size of the space 10 only needs to be large enough to allow the nail head 14a of the nail 14 to pass through. Note that the cavity 10 is not limited to the one formed outward from the nail insertion part 4 of the insert main body 1 as shown in FIG.
It may also be formed inwardly.

The catch seat 5 is detachably attached to the insert main body 1. The lower surface 5a of the seat 5 attached to the insert main body 1 serves as a contact surface with the formwork, so that the insert main body 1 can be kept in a stable state in the formwork. Further, the seat 5 is provided with several void filling members 6 corresponding to the several void spaces 10 connected to the nail insertion portion 4 of the insert body 1. Therefore, the catch 5 is inserted into the insert body 1.
By pulling it out, several void filling members 6 provided on the seat 5 can be removed at once.

The catch seat 5 is removed from the insert body 1 after the insert is buried in concrete and the formwork is removed.The void filling member 6 of this seat 5 is, for example, as shown in FIG. Outer surface 6a
If the insert is formed into a tapered shape that widens downward, the seat 5 can be easily removed after the insert is buried in concrete. Further, as shown in FIGS. 5 and 6, a wall surface 15 is formed surrounding the cavity 10 to be filled with the cavity filling member 6, and the cavity filling member 6 is housed in the wall surface 15. Then, when the insert is buried in concrete, the outer surface 6a of the void filling member 6 does not come into direct contact with the concrete, and furthermore, the seat 5 can be easily removed. That is, since external pressure applied by concrete placement can be protected by the wall surface 15, the resistance of the concrete can be reduced, and removal of the seat 5 becomes easier. Reference numeral 8 denotes a through hole through which a hanging bolt passes, and is arranged to coincide with the insertion hole 2 of the insert body 1 when the seat 5 is attached to the insert body 1.

In the present invention, in order to pull out the catch 5 attached to the insert main body 1 from the insert main body 1, it is convenient to provide the catch 7 on the catch 5.
In the case of the example shown in FIG. 1, a step is formed as a hook portion 7 so as to protrude inwardly along the inner circumferential surface of the through hole 8 of the catch seat 5. As shown in FIG. 11, the catch 5 can be easily removed from the insert main body 1 by hooking it with a separate hook 12 whose tip is bent into a key shape and pulling it downward. can. In the example shown in FIGS. 7 and 8, the hook portion 7 is constituted by a thin film formed of a soft synthetic resin having elasticity and protruding inwardly from the through hole 8. The hook portion 7 made of this thin film is provided with radial notches 11. In this example, the seat 5 can be removed using a hanging bolt inserted into the insertion hole 2 of the insert main body 1 in addition to using a separate hook. That is, by first inserting the tip of the suspension bolt into the through hole 8, hooking the thin film into the valley of the thread of the suspension bolt, and then pulling the suspension bolt downward, the seat 5 can be removed from the insert body 1. It is convenient even when there is no hook. In addition, the hook part 7 made of a thin film
As shown in FIG. 7, if the suspension bolt is projected slightly upward, the suspension bolt will be easily caught on the thin film when the suspension bolt is pulled downward after insertion. FIG. 9 shows yet another example of the hook part 7. In this example, there is a depression 16 in the center of the catch seat 5.
The hook portion 7 is formed by a protruding piece projecting outward from the center of the recess 16. By pinching this protruding piece with separate pliers or the like and pulling it downward, the seat 5 can be easily removed from the insert main body 1.

Next, a method of using the insert according to the present invention will be explained.

First, as shown in FIG. 10, the insert with the seat 5 attached to the insert body 1 is brought into contact with the formwork 13, and the insert is fixed to the formwork 13 by driving the nail 14 into the nail insertion part 4. Concrete placement is carried out in this condition. After pouring and curing, formwork 13
Remove. Next, as shown in FIG.
A separate hook 12 is inserted into the through hole 8 , and the tip 12 a of the hook 12 is locked to the hook portion 7 . Then, pull the hook 12 downward to remove the entire catch 5 from the insert body 1. By pulling out the catch 5, the void filling member 6 of the catch 5 that has been filled in the void 10 connected to the nail insertion portion 4 of the insert body 1 is removed, and the void 10 is formed. Then,
As shown in FIG. 12, the nail 14 is tilted toward the empty space 10, the nail head 14a is unlocked,
Remove the nail 14 from the empty space 10. The nail 14 can be tilted by holding the tip 14b of the nail 14 with your fingers or by hitting the tip 14b of the nail 14 with the head of a pliers or a hammer. The nails 14 used to secure the insert to the formwork 13 are thus removed.

In this example, the nail head 14a of the nail 14 driven into the nail insertion part 4 is in the recess 4a, 4 of the nail insertion part 4.
b, the concrete does not enter the lower part of the nail head 14a, and the nail 14 can be easily removed after concrete is poured and cured.

(Effects) As described above, the insert according to the present invention consists of an insert main body and a catch removably attached to the lower part of the insert main body, and has a nail insertion hole for fixing the insert to the formwork. The nail insertion part that forms the nail insertion hole is divided so as to divide the nail insertion hole in the axial direction, and one of the divided parts is provided in the insert body and the other divided part is provided in the catch seat. By pulling out the seat from the insert body, the other divided part of the nail insertion part provided on the catch comes out together with the catch, creating a space that can be used to insert the nail inserted into the nail insertion part. The nail used to fix the insert to the formwork, that is, the nail inserted into the nail insertion part, can be completely removed after the formwork is removed. This results in
No nails remain protruding from the concrete wall surface.

In addition, a structural feature of this invention is that the head of the nail inserted into the nail insertion part locks both the insert body and the seat, so the insert can be securely fixed to the formwork. You can keep it.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of the present invention,
Figure 1 is a perspective view with the catch removed, Figure 2 is a sectional view with the catch removed, Figure 3 is a partially cutaway perspective view with the catch installed, and Figure 4 is the main body. Another example of the invention, a sectional view with the catch removed,
5 and 6 show still another example of the present invention, FIG. 5 is a perspective view with the catch seat attached, and FIG.
The figure is a cross-sectional view of the catch with the catch removed, Figures 7 and 8 show examples of the catch part of the catch, Figure 7 is a sectional view of the catch, and Figure 8 is a plan view of the catch. , FIG. 9 is a sectional view of the catch showing another example of the hook part, and FIG.
Figures 1 to 12 show the usage state of the example shown in Figure 1, Figure 10 is a sectional view of the insert fixed to the formwork, and Figure 11 is a cross-sectional view of the state in which the formwork is removed and the catch is removed. Sectional view, FIG. 12 is a cross-sectional view with the nail removed. In the figure, 1 is the insert body, 4 is the nail insertion part, and 5 is the insert body.
6 is a seat, 6 is a void filling member, 10 is a void, and 14 is a nail.

Claims (1)

[Claims for Utility Model Registration] Consisting of an insert body and a seat removably attached to the lower part of the insert body, having a nail insertion hole for fixing the insert to the formwork,
The nail insertion part that forms this nail insertion hole is divided so as to divide the nail insertion hole in the axial direction, one of the divided parts is provided in the insert body, the other divided part is provided in the catch seat, and the catch seat is attached to the insert body. An insert having a nail removal structure, characterized in that it forms a cavity from which the nail can be removed by pulling it out.