JP3667624B2 - Recessed box - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an embedded box that houses an electrical device such as a distribution board or a distribution board that is embedded in a concrete structure.
[0002]
[Prior art]
When embedding electrical equipment storage boxes such as distribution boards and switchboards in concrete structures, attach the conduit to the box body and fix the box body to the formwork panel with mounting stud bolts. Concrete is injected between the opposing formwork panels. Here, the box body is fixed to the formwork panel as shown in FIG. 5 by mounting stud bolts 5 penetrating the back plate of the box body 1 and the formwork panel P on the outside of the back side of the box body 1 and the formwork panel. Nut 6 and 6 are attached from the outside of P, and this nut 6 is tightened. When concrete is poured and the form panel P is removed after the concrete has hardened, the tip of the mounting stud bolt 5 protruding on the back surface of the box body 1 may be buried in the concrete and the mounting stud bolt 5 may not be removed. . Moreover, the box main body 1 may be deformed by pressure or impact when pouring concrete into the formwork, and in order to prevent this, there has been a case where a reinforcing plate has to be incorporated in the installation site.
[0003]
[Problems to be solved by the invention]
The present invention has been made in order to solve the above-described problems, and provides an embedded type box in which a mounting stud bolt does not come off after the concrete is hardened and it is not necessary to incorporate a reinforcing plate at an installation site.
[0004]
[Means for Solving the Problems]
The present invention was made to solve the above problems by screwing a plurality of reinforcing plates bent into a U-shaped cross section inside the back plate of the box body, and having a U-shaped cross section between these reinforcing plates. By attaching a mounting plate that is bent and formed with notched bent portions at both ends, a reinforcing structure in which the bent portion of the reinforcing plate and the bent portion of the mounting plate are in contact with the back plate is formed, and the box body is formed into a frame The mounting stud bolt fixed to the panel is supported. Note that the reinforcing plate can be detachable and the mounting position of the mounting plate can be changed.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 are diagrams showing an embedded box of a reference example.
In FIG. 1, reference numeral 1 denotes a box body of an embedded box, and longitudinal reinforcing plates 3, 3 bent in a U-shaped cross section are provided on both sides inside a back plate 2 of the box body 1. . The reinforcing plates 3 and 3 are screwed to the inner side of the back plate 2 at the upper end and the lower end, respectively, and stud nuts 4 and 4 are attached to adjacent positions as attachment stud bolt attaching portions, respectively. The reinforcing plates 3 and 3 are screwed to the back plate 2 with respect to the screw holes provided in the embossed portions that protrude from the inner surface of the back plate 2, and the mounting screws do not protrude outside the back plate 2. It is preferable to do so. In addition, the stud nuts 4 and 4 can be replaced by raising the taps on the reinforcing plates 3 and 3. However, in terms of strength, the stud nuts 4 and 4 are preferably used. Can be attached by the method. Note that the mounting stud bolt mounting portion may be provided with a notch in the reinforcing plates 3 and 3 and fitting a nut attached to the mounting stud bolt.
[0006]
The embedded box shown in FIG. 1 is attached to the formwork panel P as shown in FIG. That is, a through hole is formed in the form panel P in accordance with the position of the stud nuts 4 and 4 of the box body 1, and the mounting stud bolts 5 and 5 screwed to the stud nuts 4 and 4 are passed through the through hole. The nuts 6 and 6 are attached and tightened to the mounting stud bolts 5 and 5 that protrude to the outside. When the box body 1 is fixed to the formwork panel P in this way and concrete is injected between the opposing formwork panel P ′, the tips of the mounting stud bolts 5 and 5 do not protrude outside the back plate 2. Since the concrete is not touched, the mounting stud bolt will not come off even after the concrete has hardened. Further, the box body 1 is reinforced by the reinforcing plate 3 and is not deformed by the pressure at the time of pouring concrete. Although not shown in the figure, piping and connecting a conduit to the box body 1 are the same as in the prior art.
[0007]
FIG. 3 shows an embodiment of the present invention . On the inner side of the back plate 2 of the box main body 1, lateral reinforcing plates 7 and 7 bent in a U-shaped cross section are provided vertically. The reinforcing plates 7 and 7 are screwed to the inner side of the back plate 2 at both ends, and a plurality of mounting holes 10 are provided in the longitudinal direction. The reinforcing plates 7 and 7 are screwed to the back plate 2 in the same manner as the reinforcing plates 3 and 3 in the above embodiment. Mounting plates 8 and 8 having stud nuts 9 and 9 are attached to the reinforcing plates 7 and 7. The mounting plates 8 and 8 are provided with fixing holes 11 and 11 for the reinforcing plates 7 and 7 at both ends. . Thereby, the attachment position and the number of attachment plates 8 and 8 can be freely selected. Further, if the mounting plates 8 and 8 are bent and formed into a U-shaped cross section and the bent portions at both ends are notched as shown in FIG. 4, the reinforcing plates 7 and 7 are reinforced with the mounting plates 8 and 8 attached thereto. Both the bent portions of the plates 7 and 7 and the bent portions of the mounting plates 8 and 8 are in contact with the back plate 2, thereby providing a stronger reinforcing structure. Stud nuts 9, 9 are attached to the mounting plates 8, 8, and the tips of the mounting stud bolts 5, 5 for fixing the box body 1 to the formwork panel P are screwed onto and supported by the stud nuts 9, 9 . It can be fixed to the formwork panel P.
[0008]
【The invention's effect】
According to the present invention described above, the mounting stud bolt does not come off after the concrete is solidified, and the box body does not deform when the concrete is poured, so there is no need to incorporate a reinforcing plate at the installation site. There is. Further, if the reinforcing plate is removed after the mounting, there is an advantage that a large wiring space inside the box body can be secured and wiring can be easily performed. In addition, the position and number of mounting plates to be attached to the reinforcing plate can be freely changed by attaching the mounting plate with the mounting stud bolt mounting part to the reinforcing plate with multiple mounting holes in the longitudinal direction. There is an advantage that can be selected. In the above embodiment, two reinforcing plates are attached in parallel, but it goes without saying that three or more reinforcing plates may be used depending on the size of the box body.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a mounting state of the embodiment of the present invention.
FIG. 3 is a front view showing another embodiment of the present invention.
FIG. 4 is a longitudinal sectional side view of a main part showing another embodiment of the present invention.
FIG. 5 is a cross-sectional view showing a state in which a conventional box is attached.
[Explanation of symbols]
1 Box body, 2 back plate, 3 reinforcing plate, 4 stud nut, 5 mounting stud bolt, 6 nut, 7 reinforcing plate, 8 mounting plate, 9 stud nut, 10 mounting hole, 11 fixing hole, P formwork panel, P '' Formwork panel

Claims (3)

Inside the back plate of the box body, a plurality of reinforcing plates bent in a U-shaped cross section are screwed together, and the reinforcing plates are bent in a U-shaped cross section between the reinforcing plates and the bent portions at both ends are cut off By mounting the plate, both the bent portion of the reinforcing plate and the bent portion of the mounting plate form a reinforcing structure that is in contact with the back plate, and the mounting stud bolt that fixes the box body to the formwork panel is supported. And an embedded box.   The embedded box according to claim 1, wherein the reinforcing plate is detachable. The embedded box according to claim 1, wherein the mounting position of the mounting plate can be changed.

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