JPH017768Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an insert that is embedded in the concrete surface in advance as a support for a hanging bolt for a ceiling base or equipment piping in a concrete building.

Inserts are widely used in various concrete constructions and are in great demand, but conventional inserts have the following drawbacks.

During concrete pouring, the insert bolt holes may become clogged due to slag flowing between the formwork weir and the insert surface.

The area exposed on the concrete surface is small, making it difficult to see the mounting device, especially when there is slag flowing in.

Generally, an external protrusion is installed on the side that is to be embedded into concrete and acts as an anchor to improve the pull-out strength, but this makes the insert taller and causes workers to trip over it before pouring concrete. There is a risk of being hit or kicked.

As a result, a worker may fall or the insert may be lost.

Because the insert is tall, it gets in the way of reinforcing reinforcement, resulting in poor workability.

The insert of this invention was devised to eliminate the drawbacks of the conventional inserts as described above, and is particularly intended to prevent clogging of bolt holes due to the inflow of slag.

This invention will be explained below based on illustrated embodiments.

1 to 3 show an embodiment of this invention, in which FIG. 1 is a plan view, FIG. 2 is a central vertical sectional view, and FIG. 3 is a bottom view. The insert 1 is formed into a substantially truncated conical shape with a height lower than the diameter of the bottom, and the bottom side that contacts the formwork 2 has a circular shape with a large area.

At the center of the bottom side, there is a bolt insertion hole 3 with a female thread passing through its axis, similar to conventional inserts, and around it is provided an annular blade-like protrusion 4 that slightly protrudes from the bottom surface. This blade-shaped protrusion 4 bites into the back side of the weir plate of the formwork 2 and prevents slag that enters between the formwork 2 and the bottom surface of the insert 1 from flowing into the bolt insertion hole 3 during concrete pouring. do. Although it is considered appropriate that the protruding length of the blade-shaped protrusion 4 is about 1 mm for a cast insert, for example, the design can be changed as appropriate depending on the material of the mold and the insert.

In addition, regarding fixation, this insert 1 is provided with an external protrusion as a conventional anchor,
A locking recess 5 is provided on the side circumferential surface of the insert to fix it in concrete. In this embodiment, the recess 5 is formed in an annular shape at the center in the thickness direction.
The insert 1 has a shape separated into an embedded side part and a bottom part. Further, a cross-shaped groove 6 is formed on the surface on the head side. In addition, in the figure, 7 is an insertion hole for nailing, and 8 is a nail for fixing the insert 1 to the formwork 2. In addition, the height of the insert 1 is approximately 20 mm to prevent it from getting caught on the reinforcing bars arranged in the concrete.

Figures 4 to 6 show other embodiments,
Although the shape of the locking recess 5 provided on the side peripheral surface of the insert and the shape, position, etc. of the blade-like protrusion 4 are changed, it has basically the same purpose and effect as the above-mentioned embodiment. It is.

The top of the insert, which is the embedding side, is formed flat, and independent recesses 5 are formed at four locations in the circumferential direction. There are also four nailing positions.

This invention has the above configuration and has the following advantages and features.

The blade-shaped protrusion surrounding the bolt insertion hole prevents slag from flowing in, so the bolt insertion hole is never clogged.

Since slag does not flow around the bolt insertion hole, there is no fear that the position of the insert will be difficult to determine after demolding.

Since the blade-like protrusions sink into the formwork, it is possible to prevent the insert from falling off and being lost when nailing or the like.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of this invention, Fig. 2 is a sectional view thereof, Fig. 3 is a bottom view, and Fig. 4 is a plan view showing an embodiment of this invention.
The figure is a plan view showing another embodiment, FIG. 5 is a sectional view thereof, and FIG. 6 is a bottom view thereof. 1...insert, 2...formwork, 3...bolt insertion hole, 4...blade-like projection, 5...recess, 6...
Groove, 7... Nail insertion hole, 8... Nail.

Claims (1)

[Scope of utility model registration request] The insert is approximately in the shape of a truncated cone with a height lower than the diameter of the bottom, and a locking recess is provided on the side peripheral surface of the insert, and a bolt insertion hole passing through the axis is provided on the bottom surface of the insert. An insert characterized in that an annular blade-shaped protrusion slightly protruding from the bottom surface is provided around the bolt insertion hole, and a nailing insertion hole is provided that penetrates from the insert head to the bottom surface.