JPH0326011B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a concrete box buried in concrete and used for electrical wiring in concrete buildings.

Conventionally, a concrete box consists of a penetrating frame body A and a lid B, as shown in Fig. 1. When fixing the box cover C to a curtain plate D, the lid B is removed from the penetrating frame body A by loosening screws E. , Fix the box cover C to the penetrating frame A with screws F, insert a nail H into the device mounting screw hole G provided in the box cover C, and fix it by nailing it to the curtain plate D. Then, fix the lid B with screws E. It was attached to the penetrating frame A. For this reason, lid B
There were disadvantages in that it required time and effort to remove the lid B and then reinstall the lid B, resulting in poor workability and that it was very difficult to drive the nails H into the curtain board D because the penetrating frame A was deep.

Furthermore, since the above-mentioned fixing work is very complicated, if the worker forgets to attach the lid, etc., concrete may get into the concrete box during subsequent concrete pouring, and cable wiring after the curtain board is removed. This was a major problem as it frequently became impossible to work at all.

In view of these drawbacks, the present invention integrates the lid and the penetrating frame, fixes the box cover to the curtain plate with nails, etc., and then fixes the concrete box using a movable fixture provided on the concrete box. Since it is fixed to the cover, the purpose is to improve workability by being able to do the work simply and easily, and to improve work accuracy by being able to fix it in an accurate position.

That is, the present invention provides a concrete box consisting of a lid and a penetrating frame which are fixed together with a box cover to a slab curtain board by integrally molding the lid and a penetrating frame. A concrete box is formed, and a holding part for holding a separate fixture is provided on the side wall of the box and protrudes outward, and the holding part is provided with a holding means for holding the fixture in a vertically movable and rotatable manner. To provide a concrete box characterized in that the box fixing work of clamping and fixing a box cover fixed to a curtain plate between the lower end surface of the box and a fixture can be performed outside the box.

The present invention will be explained below using examples.

Embodiment 1 To explain with reference to FIGS. 2 and 3, holding parts 3, 3 are provided protruding from the outer wall of the concrete box 1, facing each other at equal distance intervals to hold fixtures 2, 2. . The fixture 2 has a cylindrical body 4 and a substantially L-shaped anti-rotation rib 5 protruding from its substantially lower half,
A columnar part 7 in which a nut 6 is embedded is arranged in series at the tip. A nut 8 is embedded in the upper part of the cylindrical body 4, and a screw 9 serving as a holding means for holding the fixture 2 is screwed into the nut 8. Holding part 3
is an insertion hole 10 through which the cylindrical body 4 of the fixture 2 is inserted;
At the top of this insertion hole 10, there is a seat 1 for the head of the screw 9.
A substantially L-shaped groove 13 corresponding to the substantially L-shaped anti-rotation rib 5 is formed in substantially the lower half of the insertion hole 10 toward the center of the main body 1 . Then, remove the screw 9 of the fixture 2, insert the fixture 2 into the holding part 3, insert the screw 9 from the upper end of the holding part 3, screw it into the nut 8, and insert the fixture 2 into the holding part 3.
A concrete box 1 is constructed by holding the concrete box 1 in a vertically slidable manner. In this case, the anti-rotation rib 5
prevents the fixture 2 from rotating. 14 is a nail hole for directly fixing the concrete box 1 to the curtain plate 16 without the box cover 15. 17
18 is a knockout for a conduit, 18 is a connector mounting frame, 19 is a connector, 20 is a conduit, and 21 is a nail.

According to the above configuration, the box cover 15 is set at the position where the concrete box 1 marked on the curtain plate 16 is attached, and the box cover 1
The box cover 15 is fixed by inserting a nail 21 into the device mounting screw hole 22 provided in the box cover 5 and nailing it to the curtain plate 16. Next, adjust the screws 9 to move the fixture 2 downward by a predetermined distance, and then insert the columnar part 7 of the fixture 2 into the gap l between the lower surface of the flange portion 23 of the box cover 15 and the upper surface of the curtain plate 16. The concrete box 1 is moved parallel to the curtain plate 16 from the side of the box cover 15, and the box cover 1 is removed.
Place concrete box 1 directly above box 5.
Next, by tightening the screws 9, the flange portion 23 is held between the lower end surface of the side wall of the concrete box 1 and the fixture 2, and the concrete box 1 is fixed to the box cover 15. After that, conduit 2
Punch out the knockout 17 for attaching 0, attach the connector 19 to the connector mounting frame 18,
The conduit tube 20 is fixed to the connector 19. The nuts 6 are used when attaching the concrete box 1 directly to the curtain plate 16 using the nail holes 14, and when attaching the box cover 15 to the concrete box 1 after pouring concrete and removing the curtain plate 16. . In this embodiment, the fixture 2 has the anti-rotation rib 5, so when the concrete box 1 is attached to the box cover 15, the fixture 2 will not rotate and can be firmly attached.

Embodiment 2 To explain with reference to FIGS. 4 and 5, holding parts 3', 3' provided facing each other at equal distances on the outer wall of the concrete box 1' serve as holding means for holding the fixture 2'. An insertion hole 24 into which the entire screw 9' can be inserted and movable, and an insertion hole 25 through which the threaded portion of the screw 9' is inserted are provided below the insertion hole 24. Fixture 2' is made by bending or melting a steel plate or resin plate into an L shape.
It is adhesively processed and has a screw hole 26 corresponding to the screw 9'. The fixing tool 2' is held in the holding part 3' by screwing the screw 9' into the screw hole 26. The other configurations are the same as in the first embodiment.

According to the above configuration, the box cover 15' is attached to the curtain plate 16' in the same manner as in the first embodiment, the concrete box 1' is placed on the box cover 15', and the fixture 2' is rotated around the screw 9'. (direction R in FIG. 5) and position it so as to embrace the flange portion 22'.

Next, while holding the fixture 2' by hand so that it does not rotate again from the above position, tighten the screw 9' to draw the fixture 2' to the holding part 3' of the box, and move the flange part 22 to the fixture 2'. The concrete box 1' is fixed to the box cover 15' by clamping the concrete box 1' with the lower end surface of the side wall of the concrete box 1'.

The subsequent installation of the conduit 20' etc. is carried out in Example 1.
It is similar to Here, if the upper end of the short side of the L-shaped fixture 2' is made into a sharp end, it can be fixed more firmly. Alternatively, a member with high frictional resistance, such as rubber, may be attached to the flat upper end.

Incidentally, as a common feature of Embodiment 1 and Embodiment 2, the case where the holding parts 3, 3' are provided in two places at equal intervals has been described, but the present invention is not limited to this, and a plurality of holding parts 3, 3' may be provided at equal intervals. Good too. This will allow it to be fixed more firmly. Further, the connector mounting frame 18 may not be provided. In this case, the connector 19 is attached to the concrete boxes 1, 1' before attaching the concrete boxes 1, 1' to the box covers 15, 15'. Furthermore, concrete box 1,
Although the shape of 1' is described as an octagon, it is not limited to this, and may be a square, a circle, or the like.

In this way, the present invention provides a holding part for holding a separate fixture outside the side wall of the concrete box in which the penetrating frame and the lid are integrally molded, so that the work of attaching the concrete box to the box cover can be done easily. Since it can be done outside, it eliminates the trouble of removing and attaching the lid as in the past, which improves work efficiency. This can prevent concrete from entering the concrete box and making cable wiring work completely impossible after removing the curtain plate. In addition, since only the box cover is first fixed to the curtain plate, it can be fixed in a simple and accurate position without the difficulty of driving nails as in the conventional case.

Moreover, since the fixture is movably held in the holding portion of the concrete box, there is no risk of it being lost, and the concrete box can be easily and firmly attached to the box cover.

[Brief explanation of drawings]

FIG. 1 is a diagram of a conventional installation state, FIG. 2 is a front view of a main part broken away and installed state of the first embodiment of the present invention, FIG. 3 is a perspective view of a fixing device of the first embodiment of the present invention, and FIG. The figure is a cutaway front view showing the attached state with main parts cut away in the second embodiment of the present invention, and FIG. 5 is a bottom view showing the fixture before and after rotation of the second embodiment of the present invention. (Explanation of symbols of main parts), 1, 1'... Concrete box, 2, 2'... Fixture, 3, 3'...
...Holder, 15,15'...Box cover.

Claims (1)

[Scope of Claims] 1. In a concrete box consisting of a lid and a penetrating frame that are fixed together with a box cover to a slab curtain plate, the lid and the penetrating frame are integrally molded to form a concrete box, and a concrete box is formed on the side wall of the box. A holding part for holding a separate fixture is provided to protrude outward, and the holding part is equipped with a holding means for holding the fixture in a vertically movable and rotatable manner. A concrete box characterized in that the work of fixing the box by clamping and fixing it between the lower end surface of the concrete box and a fixing tool can be performed outside the box.