JPS5847791Y2 - Fixing device for embedded electrical wiring box to concrete formwork - Google Patents

Description

[Detailed description of the invention] The present invention relates to a fixture for fixing a buried box for electrical wiring to a concrete formwork, and more specifically, the present invention relates to a fixture for fixing a buried box for electrical wiring to a concrete formwork. This relates to a fixture for accurately attaching to the inner surface of a frame.

Generally, an embedded box for electrical wiring is placed together with reinforcing bars and the like before concrete is poured, and then attached to the inner surface of the concrete formwork.

For this reason, the box described above must be fixed only from the outside of the concrete formwork, and the position of the box placed together with reinforcement etc. cannot be confirmed because it is obstructed by the concrete formwork, so the concrete formwork The reality is that it is not easy to accurately fix the box to the inner surface of the box.

The present invention was devised in view of the above-mentioned circumstances, and includes a bolt that is longer than the depth of the embedded box for electrical wiring, an engaging piece that is longer than the opening width of the embedded box and shorter than the depth, and and a nut screwed into the bolt, and the center of the retaining piece and the tip of the bolt are pivotally connected via a pin perpendicular to the longitudinal direction of the bolt. It is an object of the present invention to provide a fixing tool with good workability that can fix a box to the inner surface of a formwork only from the outer surface with high precision without damaging the box.

The configuration of the present invention will be explained with reference to the illustrated embodiment.
1 is a bolt, which is longer than the depth of the electrical wiring embedded box A.

The bolt 1 has a semicircular cross section cut off at one end, and a thread is cut from the tip to the opposite side.

Reference numeral 2 denotes an engagement piece that is longer than the opening width of the box A and shorter than the depth thereof, and its center is pivotally connected to the tip of the scraped portion of the bolt 1 by a pin 3 perpendicular to the longitudinal direction of the bolt 1. The distance between the pin 3 and the threaded portion is narrower than the thickness of the formwork B.

Further, the cross-sectional shape of the engaging piece 2 is formed to be approximately the same as the cross-sectional shape of the cut-off portion of the bolt 1, and a smoothly inclined guide surface 4 is formed at the end thereof.

5 is a wing nut screwed into the threaded portion of the bolt 1, 6 is a washer, and 7 is a conduit.

In order to fix the embedded box A for electrical wiring to the formwork B using a fixing device, first set the installation center point of the electrical concrete box A on the outside surface of the formwork B (the center of the box).
Mark out.

Next, an insertion hole for the bolt 1 is drilled centering on this ink.

Then, with the engagement piece 2 aligned with the bolt 1, it is inserted into the hole from the outer surface of the formwork B.

Then, the end surface of the retaining piece 2 is held against the bottom surface of the electrical wiring embedded box A, guided by the guide surface 4, and rotated about the pin 3.

In this state, the tip of bolt 1 is connected to the electrical wiring embedded box A.
When the engaging piece 2 is pushed in until it hits the bottom surface of the bolt 1, the rotation of the engaging piece 2 increases and eventually it becomes perpendicular to the bolt 1.

Therefore, when the wing nut 5 is screwed onto the bolt 1 and tightened with the retaining piece 2 opened at right angles, the bolt 1 is gradually pulled out.

Then, the retaining piece 2 is also drawn toward the formwork B side while maintaining its perpendicular state and comes into contact with the inner surface of the opening edge of the electrical concrete box A, so that the box A is tightened and fixed to the formwork B.

If the opening length of the electrical wiring embedded box A is longer than the length of the engagement piece 2, after the retention piece 2 opens at a right angle, it is deflected in the width direction of the opening, which is shorter than the retention piece 2. That's fine.

Also, after pouring concrete, if the nut 5 is removed and the formwork B is removed from the concrete surface, the electrical wiring embedded box A will open outward, so the locking piece 2 can be manually operated from the front.
The fitting can be easily retrieved while disengaging and can be reused.

In short, the present invention provides an embedded box for electrical wiring from the outside of the concrete formwork before concrete pouring.
A fixture for fixing to the inner surface thereof, the fixture comprising: a bolt longer than the depth of the embedded box for electrical wiring; a retaining piece longer than the opening width of the embedded box and shorter than the depth; and a nut screwed into the bolt, and the center of the retaining piece and the tip of the bolt are pivotally connected via a pin perpendicular to the longitudinal direction of the bolt. Even if it is installed on the inner surface of a concrete formwork that has been placed together with reinforcing bars etc., it can be operated from the outside of the formwork without any special processing on the embedded electrical wiring box. It can be firmly and precisely fastened to the inner surface of the formwork by simply tightening it, so it has an extremely useful practical effect that allows easy and economical construction even in the case of column-shaped embedding, which was considered extremely difficult in the past. It is something that plays.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the present invention, and Fig. 2 is a front view showing an embodiment of the present invention.
3 is a sectional view of the device in use, and FIG. 4 is a front view of FIG. 3. In the figure, 1 is a bolt, 2 is a retaining piece, 3 is a pin, A is an embedded box for electric wiring, and B is a formwork.

Claims (1)

[Scope of utility model registration request] A fixing device for fixing an embedded box for electrical wiring to the inner surface of a concrete formwork before pouring concrete, the fixing device being longer than the depth of the embedded box for electrical wiring. A bolt, an engagement piece that is longer than the opening width and shorter than the depth of the embedded box, and a nut that is screwed into the bolt, and the center of the engagement piece and the tip of the bolt are aligned in the longitudinal direction of the bolt. A fixing device for fixing an embedded box for electrical wiring to a concrete formwork, characterized in that it is configured to be pivotally connected via a pin orthogonal to the box.