JPH0116328Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an improvement of a fixing device for fixing an embedded electrical wiring box embedded in a concrete frame from the outside of the concrete formwork to the back of the formwork before concrete is poured. It is related to.

Embedded boxes for electrical wiring are placed in a predetermined position together with reinforcing bars before concrete is poured, and then fixed to the back of the formwork from the outside of the concrete formwork to be erected. When removing the concrete formwork, the fixing device will be removed and recovered.

However, the above-mentioned buried box for electrical wiring is
Fixing can only be done from outside the concrete formwork, and the position of boxes placed together with reinforcement etc. is obstructed by the concrete formwork that has been erected, making it impossible to confirm the position. In reality, it is not easy to accurately fix the box to the back surface of the device.

For this reason, conventionally, as shown in Fig. 1, metal fittings b with female threads carved in advance are fitted into the rear wall of box a, and these are placed together with reinforcing bars, etc., and the concrete formwork C is erected. Afterwards, the threaded portion of one end of the double-threaded bolt d is screwed into the female threaded portion of the metal fitting b from the outside of the concrete formwork C, and a nut e is screwed into the threaded portion of the other end to secure it to the concrete formwork C. However, after concrete formwork C was erected, one end threaded part of both screw bolts d was inserted into box a from the outside of the formwork.
It is not easy to match the female screw part of hardware b, and it is not easy to tighten the nuts e to fix box a to the back of formwork C, so it is difficult to place concrete. Later, it takes a lot of effort to remove these fixing members, and in some cases, the metal fittings b of the fixing members cannot be retrieved, creating a problem in that they get in the way in the space inside the box.

In view of the above-mentioned circumstances, the present invention has been improved in order to eliminate the drawbacks of the conventional method.The purpose of this invention is to install an embedded box for electrical wiring into the concrete formwork before pouring the concrete. Not only when fixing to the back of the formwork from the outside, but also when removing the concrete formwork after pouring concrete.
The object of the present invention is to provide a device for fixing an embedded electrical wiring box to a concrete formwork, which allows the work to be carried out extremely simply and quickly even when the fixing device is removed.

The above objects of the present invention will become more clear by describing the embodiments shown in FIGS. 2 to 4.

That is, in FIGS. 2 and 3, reference numeral 1 is a buried box for electrical wiring, and the box 1 is of an open-front type, and a connection hole 3 for a conduit 2 is bored in the peripheral wall thereof. A known mounting piece 4 for the front cover is integrally formed at the upper and lower portions of the open end edge.

Reference character A is a long groove constituting a part of the fixing device according to the present invention, and the long groove A is horizontally formed approximately at the center of the rear wall 5 of the box 1, and is connected to a plate-shaped locking metal fitting to be described later. It has a width through which the locking piece 7 of B can be inserted.

Reference numeral B denotes a plate-shaped locking hardware that also constitutes a part of the fixing device according to the present invention, and the locking hardware B is formed by bending a metal strip 6 that can be inserted into the long groove A into a substantially U-shape. Then, the interval between the leg pieces 6a and 6b is set to a required dimension, and a cut groove 8 of a required width is formed in one leg piece 6a from its tip along the center part of the width of the strip. The other leg piece 6b has a locking piece 7 formed by bending its tip portion outward.

Further, reference numeral C denotes a fastening hardware that constitutes a part of the fixing device according to the present invention, and the fastening hardware C has a locking head 9 at one end of the rod, and a predetermined length from the locking head 9. A locking rod 11 is provided with a locking groove 10 with an enlarged upper end and a contracted lower end in the longitudinal direction near the other end of the separated rod, and the locking rod 11 is removably inserted into the locking groove 10 of the locking rod 11. It is composed of a wedge-shaped tightening member 12.

In addition, 13 is concrete formwork, 14 is formwork 1
3 is an insertion hole for the anchoring rod 11, and 15 is a concrete frame to be cast.

When fixing the electrical wiring embedded box 1 to the back side of the concrete formwork 13 from the outside of the concrete formwork 13 before pouring concrete using the fixing device configured as described above, First, the locking piece 7 of the locking hardware B is inserted into the long groove A formed in the rear wall 5 of the box 1, and then bent again downward to form the hooking piece 7a. After attaching the locking hardware B to the box 1, the box 1 is placed in a predetermined position together with reinforcing bars before concrete pouring.

Next, a concrete formwork is built in front of the opening side of the box 1, an insertion hole 14 is opened in accordance with the installation position of the box 1 on the concrete formwork 13, and the anchoring rod 11 is locked through the insertion hole 14. Insert it from the head 9, and lock the head into the cut groove 8 of the locking hardware B by groping inside the box 1.

Here, the U-shaped leg pieces 6a, 6b of the locking hardware B
The predetermined spacing is sized to accommodate the head 9 of the locking rod 11, and the cut groove 8 is made to correspond to the thickness of the locking rod 11. The locking head 9 may be a normal hexagonal shape, but in order to make the insertion hole 14 as small as possible, it is preferable that the locking rod 11 has an oval head with a small diameter. It is preferable to provide a taper at the upper end of 8 to facilitate attachment. Next, a wedge-shaped tightening member 12 is inserted into the locking groove 10 of the locking rod 11.
When inserted and driven in, the locking rod 11 becomes the wedge-shaped tightening member 1.
2, the box 1 is tightly fixed at its open end to the back surface of the concrete formwork 13.

On the other hand, in order to remove the anchoring rods 11 when removing the concrete formwork 13 after pouring concrete,
By simply pulling out the wedge-shaped tightening member 12 from the locking groove 10 and removing the locking head 9 of the locking rod 11 from the cut groove 8 of the locking hardware B, it can be easily and quickly removed and recovered. can.

In addition, after removing the concrete formwork 13,
If the locking hardware B is struck upward, the bent piece 7a of the locking hardware B will come out of the long groove A upward, so that it can be easily recovered. Even if it becomes impossible to remove it, it is convenient because it will not interfere with the wiring if it is crushed.

Note that the other leg piece 6b of the locking hardware B is
As shown in the figure, if the hooking piece 6b' is formed by folding it up and down, the long groove A of the box 1 will be closed, and the concrete mortar will be placed inside the box 1. can be prevented from flowing in.

In short, the present invention is a fixing device for fixing an embedded electrical wiring box to the back of the formwork from the outside of the concrete formwork before concrete is poured. A long groove is formed horizontally in the substantially central part of the face wall, and a metal strip that can be inserted into the long groove is bent into a substantially U-shape. The tip of one leg is bent outward to form a locking piece, and the other leg piece has a cut groove of a predetermined width formed from the tip of the leg along the center of the width of the strip. A locking rod having a locking head at one end and a locking groove formed in the longitudinal direction near the other end separated by a predetermined distance from the locking head; It is composed of a wedge-shaped clamping member that is removably inserted into the locking groove, and a clamping hardware consisting of a wedge-shaped clamping member that is detachably inserted into the locking groove.
When fixing an embedded electrical wiring box to the back of the concrete formwork from outside the formwork before pouring concrete, attach the anchoring rod to the locking hardware attached to the rear wall of the box. In addition to that,
By simply inserting the wedge-shaped tightening member into this anchoring rod, it can be fixed extremely easily and quickly.Also, when removing the anchoring rod after pouring concrete, the wedge-shaped tightening member can be removed and the Not only can it be removed extremely easily by simply disengaging the locking rod from the locking rod, but the locking rod can also be removed and recovered, compared to conventional devices of this kind. It has many useful practical effects.

[Brief explanation of the drawing]

The drawings show an embodiment of a device for fixing an embedded electrical wiring box to a concrete formwork according to the present invention, in which Fig. 1 is a longitudinal cross-sectional side view of the conventional example showing the fixed state, and Fig. 2 is the same as above. FIG. 3 is an exploded perspective view of the present invention, and FIG. 4 is a partial longitudinal side view of another embodiment. 1... Embedded box for electric wiring, 5... Rear wall, A... Long groove, B... Locking hardware, 6... Its metal strip, 6a, 6b... Its leg pieces, 7... Its locking Piece 8...The cut groove, C...The fastening hardware,
9...The locking head, 10...The locking groove, 11
...The anchoring rod, 12...The wedge-shaped tightening member, 1
3... Concrete formwork.

Claims (1)

[Scope of utility model registration request] This is a fixing device for fixing an embedded electrical wiring box to the back of the concrete formwork from the outside of the formwork before concrete is poured. A long groove is formed in the groove, and a metal strip that can be inserted into the long groove is bent into a substantially U-shape. Bend outward to form a locking piece,
The other leg piece has a locking hardware formed by forming a cut groove of a predetermined width from the tip end along the center part of the strip width, and a locking head at one end, and the locking head has a locking head at one end. A fastening hardware consisting of a locking rod having a locking groove formed in the longitudinal direction near the other end separated by a predetermined length, and a wedge-shaped tightening member detachably inserted into the locking groove of the locking rod. A device for fixing an embedded electrical wiring box to a concrete formwork, characterized in that it is configured by: