JPH0127210B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a bolt connection insert buried in concrete for suspending a bolt or a hanging rod having a male threaded portion from a concrete ceiling surface, for example.

Conventionally, as shown in FIG. 1, this type of bolt connection insert has a female threaded hole 2 that opens at the center of the lower surface of a pedestal 1, and two or three female threaded holes that are formed on the outer peripheral edge of the pedestal 1. There is one in which a mounting hole 3 is formed, and a retaining portion 4 is formed in the upper part of the female threaded hole 2.

However, when attaching this conventional bolt connection insert to the formwork 6, the nail 5 is inserted into one mounting hole 3.
After inserting the nail 5 and driving the nail 5 into the formwork 6, the worker changes the working position and inserts another nail 5 into another mounting hole 3 in order to avoid interference between the retaining part 4 and the hammer. It became necessary to insert and nail the insert, and not only did it take a lot of time to install one insert, but it also required the use of a large number of nails.

Purpose This invention was made in view of the above circumstances, and its purpose is to provide a new bolt that can be easily and securely installed using only one nail and that can improve work efficiency. The purpose is to provide a connecting insert.

First Embodiment A first embodiment embodying the present invention will be described below with reference to FIGS. 2 to 4. A thick-walled pedestal 11 having an approximately triangular planar shape is formed of cast iron, and a threaded cylindrical portion 1 projecting upward is provided on the right side of the pedestal 11 in the drawing.
2 are integrally formed. This threaded cylindrical portion 12 is formed with a female threaded hole 13 that opens at the lower surface of the base 11 and extends vertically. On the lower surface of the pedestal 11 is a gasket 1 located around the opening of the female screw hole 13.
4 is fixed with adhesive. Further, the threaded cylinder portion 12
A retaining portion 15 is formed to protrude from the upper end of the holder.

A mounting hole 16 is formed in the approximate center of the pedestal 11 and extends vertically through the pedestal 11, and a positioning protrusion 17 is integrally formed on the lower surface of the left side of the pedestal 11. .

Next, a method of using the bolt connection insert configured as described above will be explained. First, as shown in FIG. 3, the insert pedestal 11 is placed at an appropriate position on the upper surface of the concrete form 18 for forming the ceiling concrete 19. Then, by inserting and nailing a nail 20 into one mounting hole 16, the insert can be easily mounted. At this time, the positioning protrusion 17 bites into the concrete formwork 18 to position the insert, and the gasket 14 is held between the formwork 18 and the pedestal 11 to completely close the female threaded hole 13.
Note that this work is performed after the formwork 18 is assembled at the molding position.

Next, cocrete 19 is poured. Then, when the concrete 19 hardens, the insert is firmly fixed by the retaining portion 15 without coming off from the concrete 19. Next, when the formwork 18 is dismantled, the lower end surface of the pedestal 11 is exposed to the outside, and the female screw hole 1
3 opens downward. Therefore, by screwing the male screw portion 21a at one end of the hanging rod 21 shown in FIG. 4 into the female screw hole 13 in this state, the hanging rod 21 can be vertically suspended and fixed. After that, the hanging rod 21
It can support piping, ceiling lining, etc.

As mentioned above, if you use this insert,
There is no need for the operator to change the working position during the installation, and the installation can be done easily and reliably by simply driving one nail 20. Furthermore, in this embodiment, since the pedestal 11 is formed with a thick wall, the nail 20 is held upright, and there is no need to support the nail 20 inserted into the mounting hole 16 with your fingers when driving the nail 20. It is possible to improve the efficiency and safety of the installation work. Further, since the packing 14 is disposed around the opening of the female screw hole 13, it is possible to reliably prevent the concrete 19 from flowing into the female screw hole 13 when pouring the concrete 19.

Second Embodiment Next, a second embodiment of the present invention will be described in FIGS. 5 and 6.
This will be explained according to the diagram. In this embodiment, a protrusion 12a is integrally formed on the outer surface of the threaded cylindrical portion 12 on the center side of the base 11, and a mounting hole 16 is vertically formed through the protrusion 12a. A nail 20 is inserted into the mounting hole 16 in advance, and the nail 20 has a plurality of upwardly directed barb-shaped retaining protrusions 20a on its outer peripheral surface. Before the insert is attached, the protrusion 20a engages with the inner peripheral surface of the attachment hole 16 due to its own elasticity, and the nail 20 is held in the inserted state shown by the chain line in FIG. Therefore, in this embodiment, there is no need to insert the nail 20 into the mounting hole 16 when attaching the insert to the formwork 18.
The insert can be attached to the formwork even more easily.

Third Embodiment Next, a third embodiment of the present invention is shown in FIGS. 7 and 8.
This will be explained according to the diagram. In this embodiment, the pedestal 11
and the protrusion 12a are integrally formed of synthetic resin,
A reinforcing rib 22 is provided between both 11 and 12a. Attachment hole 16 formed in this protrusion 12a
A nail 20 is inserted into and held in advance, and before the insert is attached, the nail 20 is placed in the protruding position shown by the chain line in FIG. 8 by the gripping action of the synthetic resin.
Further, the threaded cylindrical portion 12 and the retaining portion 15 are integrally formed of cast iron, and the threaded cylindrical portion 12 is inserted and fixed into an insertion hole 23 formed in the synthetic resin portion.
Therefore, in this embodiment, there is no need to insert the nail 20 into the mounting hole 16 when installing the insert, making the installation even easier, and the base 11 etc. are molded from synthetic resin. Therefore, the insert can be manufactured at low cost.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, the outer shape of the insert may be changed as appropriate, or the packing 14 may be omitted, and the packing 14 may be placed around the opening of the female threaded hole 13 instead. The positioning protrusion 1 may be formed integrally with the annular protrusion, or the tip edge of the annular protrusion may be sharpened to fit into the formwork 18.
7 and the packing 14 may be omitted, or the protrusion 1 may be omitted.
7 and the packing 14 may be omitted, and the lower surface of the base 11 and/or the threaded cylinder portion 12 may be made rough to prevent slipping.

Effects As detailed above, this invention provides a female threaded hole on one side of the pedestal and a mounting hole approximately in the center of the pedestal, so it is only necessary to provide one mounting hole, and the insert At the time of installation, the worker can easily install the product without changing the work position, and the efficiency of the work can be increased, and the amount of nails used can be reduced, which is an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of a conventional insert. 2 to 4 show a first embodiment of the present invention, in which FIG. 2 is a plan view, FIG. 3 is a sectional view of the main part of the insert, and FIG. 4 is a state in which the hanging rod is attached. FIG. 5 and 6 show a second embodiment of the present invention, in which FIG. 5 is a plan view and FIG. 6 is a sectional view of a main part. 7 and 8 show a third embodiment of the present invention, in which FIG. 7 is a plan view and FIG. 8 is a sectional view of a main part. Pedestal...11, Female thread...13, Mounting hole...1
6. Positioning protrusion... 17. Concrete formwork...
...18, Concrete...19, Nail...20, Male thread part...21a.

Claims (1)

[Claims] 1 Female screw hole 1 opened on the lower surface of the pedestal 11
3 and a mounting hole 16 penetrating the pedestal 11,
After being attached to the concrete formwork 18 with nails 20 inserted into the attachment holes 16, it is buried in concrete 19, and after the concrete formwork 18 is dismantled, the lower surface thereof is exposed to the outside. In this state, insert a bolt, etc. 21 into the female threaded hole 13.
A bolt connection insert to which a is connected, characterized in that the female threaded hole 13 is provided on one side of the pedestal 11, and the mounting hole 16 is provided approximately in the center of the pedestal 11. 2 The part where the mounting hole 16 of the pedestal 11 is formed is a nail 2
The bolt connection insert according to claim 1, wherein the bolt connection insert has a thickness that allows the bolt to be held upright in the inserted state. 3. The bolt connection insert according to claim 1 or 2, characterized in that a packing 14 is disposed around the opening of the female threaded hole 13. 4. Claims 1 to 3 are characterized in that only one mounting hole 16 is provided.
Inserts for bolted connections as described in any of the paragraphs.