JPH019223Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tensioner installed between opposing concrete temporary frames, and is for bringing an outlet box or the like into close contact with the concrete temporary frames.

Boxes such as outlet boxes and switch boxes for electrical wiring are buried in the concrete walls of buildings, but when burying these boxes, ready-mixed concrete is poured with the boxes attached between temporary concrete frames. .

By the way, at this time, it is necessary to ensure that the box is brought into close contact with the temporary concrete frame so that the fluid ready-mixed concrete does not enter the box.
For this purpose, a tensioner 41, which also serves as a spacer, as shown in FIG. 6, is often used in the past.
This is made by bending a thin steel plate into a substantially U-shape, and as shown in FIG. Fix it to the frame 42 with nails 43, etc., and attach the base to the back of the box 44 with nails 45.
etc., so that the surface of the box 44 is brought into close contact with one of the temporary concrete frames 46 on the indoor side. However, in this case, as shown in Fig. 7, almost no concrete enters the x section covered top and bottom by the legs 41a, creating a cavity, and as a result, when the wall is exposed, rain water enters from here and the wall is damaged. It has the disadvantage that it soaks into the interior and creates dirty stains on the indoor side of the wall, making it extremely unsightly. Furthermore, since the conventional tensioning tool 41 has a thin plate shape,
During concrete pouring, the leg portions 41a are easily deformed by receiving pouring pressure from the direction of arrow A shown in FIG. As a result, the box 44 is tilted and a gap is created between the temporary concrete frame 46 and the box 44.
There is a drawback that fresh concrete with high fluidity enters the box 44 through this gap. Furthermore, as shown in FIG. 6, the conventional tension member 41 has to be bent at two locations each to form the seat 41b, and as shown in FIG. It is unsightly because two of the seats 41b are exposed on the outer surface of the concrete wall.

The present invention was devised in view of the above circumstances, and its purpose is to improve the shortcomings of the conventional tensioning device 41, to reliably prevent the formation of cavities and stains in the concrete wall during pouring of fresh concrete, and to prevent the seat from being exposed. It is an object of the present invention to provide a tensioning tool that can reduce the amount of stress as much as possible. A further object of the invention is to provide a tensioner whose length can be adjusted by folding the creases and which can easily accommodate differences in the thickness of concrete walls.

The object of the present invention is a tensioning device that is interposed between the back surface of a box and the other temporary concrete frame in order to bring the surface of the box into close contact with one of the concrete temporary frames that are opposed to each other.

In FIG. 1, the tensioning tool 1 according to the present invention has a rod shape as a whole, and the peripheral wall thereof has fold grooves 2.
have. By folding the grooves 2, the overall length can be adjusted to accommodate differences in concrete wall thickness. It is desirable to form a plurality of fold grooves 2 at predetermined intervals as in the embodiment shown in FIG.

The thickness of concrete walls such as room walls and floor walls is generally 120mm, 150mm, etc.
Also, the thickness of the box 44 such as an outlet box or a switch box (dimension T in Fig. 5)
Generally, several types are defined in the standards. Therefore, it is desirable to set the distance between the respective fold grooves 2 in advance so as to correspond to the thickness of the concrete wall and the thickness of the box 44. It is desirable that the folding groove 2 be formed in an annular shape so as to be continuous around the entire circumference of the tensioning tool 1, as in the example shown in FIG. If it is formed into an annular shape, the length can be adjusted by folding the tensioner 1 through the folding groove 2 very easily using pliers 3 or the like, as shown in FIG. It is preferable that the tensioning tool 1 be made of resin such as ABS resin in the shape of a round bar. Reference numeral 4 denotes a male threaded portion provided at one end 1b of the tensioner 1, through which the tensioner 1 is attached to the back side of the box 44. Here, since the male threaded portion 4 has multiple threads and thread valleys, the tensioner 1 can be attached to the back side of the box 44 more reliably. Furthermore, the tension rod 1 can be attached to the box 44 with a simple operation of screwing it in. In addition, when attaching the tensioner 1 to the box 44 via the male threaded portion 4, a female threaded portion is formed directly on the back wall of the box 44, and this female threaded portion and the male threaded portion 4 are screwed together. Alternatively, a fitting 5 which is separate from the box 44 as shown in FIG. It is also possible to have a configuration in which the two are screwed together. When a separate fixture 5 is used, there is no need to make any particular improvements to the box 44 itself. In the case of the tensioning tool 1 shown in FIG. 1, a flange portion 7 is provided, and the male thread portion 4 is screwed into the flange portion 7 by means of this flange portion 7.

Next, a typical method of using the tensioner according to the present invention will be explained. First, as shown in Figure 3,
With, for example, two crank-shaped auxiliary rods 9 fitted into the box, the fixture 5 is attached with screws or the like to the back wall of the box 44 to which the flexible electric conduit 13 made of synthetic resin is connected. Furthermore, the male threaded part 4 of the tensioner 1 is screwed into the female threaded part 6 of the fixture 5, thereby attaching the tensioner 1 to the rear wall of the box 44 in a protruding state. In such a state, as shown in FIGS. 5 and 4, the reinforcing bars 10 that have been erected side by side with other temporary concrete frames 12
Bind both ends of the auxiliary rod 9 to the support frame of the concrete wall with wire or the like, and then attach the box 44 to the reinforcing bar 10. Next, one of the temporary concrete frames 11 is erected and fixed at an appropriate position. Then, as is clear from FIG. 5, the tensioning tool 1 acts as a so-called tensioning rod between the back wall of the box 44 and the other temporary concrete frame 12, and as a result, the tensioning tool 1 44 can be reliably brought into close contact with one of the temporary concrete frames 11. The electric conduit is not limited to the flexible electric conduit 13, but may be a metal electric conduit.

FIG. 8 is a diagram showing how to use the tensioner 1 when the separate fixture 5 is not used.

Now, as explained above, the tensioning device according to the present invention has a rod shape, has a groove on its peripheral wall whose length can be adjusted, and has a threaded portion at one end. If one of the concrete temporary frames is fixed in an upright position at an appropriate position with the tensioning device attached to the back side of the box through the It can be reliably brought into close contact with the temporary concrete frame. Furthermore, since the tensioning tool according to the present invention is rod-shaped, when constructing a concrete wall by pouring fresh concrete between the temporary concrete frames 11 and 12, the tensioning tool in the form of a thin plate as shown in FIG. Unlike the case of No. 41, the ready-mixed concrete often penetrates under the tensioner 1.
It is possible to prevent the concrete wall from becoming hollow as much as possible. Deformation during concrete pouring can also be reliably prevented, unlike the tensioning tool 41 which is in the form of a thin plate. Similarly, stains on concrete walls can be prevented as much as possible.
In addition, the length can be adjusted simply by folding the folding groove 2, making it easy to work and convenient. Also, the seat 41b has a large area.
Unlike the conventional method shown in FIG. 7, which had to occur in two places and was unsightly as it appeared on the outer surface of the concrete wall, the part that comes into contact with the temporary concrete frame 12 is the end of the tensioner 1 as shown in FIG. 8. Since there is only one wall, it looks better than traditional concrete walls.

If the tensioner 1 is made of synthetic resin colored in the same color as the concrete wall, it will look even better.
Also, if it is made of synthetic resin, it will not rust even if it comes into contact with rainwater, and it can prevent staining.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the entire tensioning tool, Fig. 2 is a perspective view of the tensioning tool in a state where the crease groove is broken and cut, and Fig. 3 is a perspective view of the tensioning tool before it is attached to a box equipped with an auxiliary rod. Fig. 4 is a perspective view of the box attached to the reinforcing bar via the auxiliary rod, Fig. 5 is a side view for explaining the state in which the tensioner is used, and Fig. 6 is the conventional tensioner. FIG. 7 is a perspective view of the tensioning tool, and FIG. 8 is a side view for explaining the usage state of the conventional tensioning tool, and FIG. 8 is a side view for explaining the usage state of the tensioning tool of the present invention.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A bulge interposed between the back of the box and the other temporary concrete frame in order to bring the box provided between opposing temporary concrete frames into close contact with one temporary concrete frame. A box, which is rod-shaped, has a groove on its peripheral wall that can be adjusted in length by folding and cutting, and has a male threaded part attached to the back side of the box at one end. A tensioner interposed between the concrete temporary frame. (2) The tensioning device as set forth in claim 1 of the utility model registration claim, wherein the male threaded portion is a male threaded portion having a flange portion for screwing.