JPH0353544Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to the improvement of temporary formwork side fixings for boxes used for embedded piping in concrete buildings.

[Conventional technology]

When constructing a concrete building, it is necessary to fix a box for embedded piping to the slab or wall of the concrete structure in advance. Examples of this box include an outlet box, a concrete box, a switch box, a temporary frame, etc., and will be described below as an outlet box for convenience of explanation. Conventionally, the structure for fixing this outlet box is as shown in FIG. 6a, in which holes 7A are drilled in advance in one of the temporary formworks 7 made of wood, corresponding to the locations where the outlet box 10 is to be attached. Next, the long bolt 14 is inserted through the hole 7A from the outside, and is inserted into the mounting hole 16 in the bottom wall of the outlet box 10, and the tip side of the long bolt 14 is screwed with the nut fitting 13, etc., and the outlet box is closed. 10 is held by a long bolt 14. Next, the proximal ends of the long bolts 14 protruding outward from the temporary formwork 7 are tightened and fixed with washers or nuts 17 to fix the outlet box 10 in a predetermined position. Then, a temporary formwork (not shown) is installed opposite to this temporary formwork 7, and concrete is poured into the gap and formed into a predetermined shape. After the concrete hardens, the temporary formwork on both sides is removed. At this time, the nuts 17 are removed, and the long bolts 14 are turned in the opposite direction to remove them from the nut fittings at the tips and pulled out. As a result, the outlet box 10 becomes hollow inside and allows wiring work to be carried out. Further, the fixing structure shown in FIG. 6B has a configuration in which a receiver 13' is screwed onto the outlet box 10 from the inside, and a hook 14' is used instead of a long bolt. In this case as well, the outlet box 10 can be positioned by screwing the hook 14' with the nut 17. The parts can then be sequentially removed using the same procedure as described above. All of the above configurations are outlet box 1.
0 is shown to be opened on the inside, but if it is opened on the outside, extend the long bolt 14 from the bottom wall of the outlet box 10 to the opposing temporary formwork, and tighten it with a nut from the outside in the same manner. ing. Therefore, in any case, in order to fix the outlet box, it is first necessary to make holes in the temporary formwork at locations corresponding to the fixing positions of the outlet box. Therefore, even if the installation position of the outlet box is decided, the drilling position will not be known until the installation of the temporary formwork is completed, so the installation work of the outlet box, which is included in the electrical work, will not be carried out and a different work will be required. The above-mentioned work performed by a person is a wasteful and time-consuming work. Furthermore, in the case where the outlet box 10 is opened to the outside, in order to attach the long bolts 14, hooks 14', etc. to the holes 7A provided in the temporary formwork 7, they must be screwed from the outside with nuts 17.
In the case of high-rise buildings, this has become a dangerous and troublesome task. Therefore, in order to eliminate the above-mentioned drawback, as shown in FIG. A configuration in which a substantially U-shaped mounting bracket 18 is attached is known. The mounting bracket 18 has a pair of connecting pieces 18a protruding from its base end for connecting the outlet box 10, and has a sharp claw 18b at its tip. Therefore, by fixing the connecting piece 18a to the outlet box 10 and driving the nail 18a into the temporary formwork 8 from the inside, the outlet box 10 can be closed.
can be fixed. However, in the above configuration, when the formwork material 8 is peeled off after filling with concrete, the tips of the claws 18b protrude outside and must be cut off. Even after the cutting, the cut surface of the mounting bracket 18 remains on the end face of the concrete, and a problem arises in that cracks or the like occur between the remaining mounting bracket and the concrete. In addition, in the case of a slab, as shown in Figure 7b,
Although the outlet box 10 is fixed and held on the mounting bracket 18', the height cannot be freely adjusted according to the floor thickness. Therefore, a structure in which the mounting bracket is provided with an adjuster screw for holding it has been considered, but the structure is complicated and the mounting bracket lacks versatility.

[Problem that the invention attempts to solve]

This idea was created as a result of intensive research to solve the above-mentioned drawbacks, and its main problems are:
The box can be easily fixed to the temporary formwork from the inside, and is highly reliable as it does not damage the concrete even after the temporary formwork is removed.It is also highly versatile and can be used for slabs. To provide temporary formwork side fixtures.

[Means to solve the problem]

In order to solve the above-mentioned problems, this invention (a) provides a fixing device body 2 having a hole 3 in which a screw is carved on the inner circumferential surface; (b) provides a fixing device main body 2 having a hole 3 with a screw cut into the inner circumferential surface; (c) A tightening screw 5 is provided in which the head is latched to the small insertion hole 4 and the tip thereof projects outward; (d) At least one of the fixing device body 2 is A technical measure is taken in which a nut part 2a whose outer peripheral surface is formed into a polygonal column is provided on the tip side of the nut part 2a.

[Effect]

Since this invention has the above-mentioned configuration, the temporary formwork side fixing tool 1 is attached to the temporary formwork 78 from the inside by tightening the tightening screw 5.
, and insert the mounting hole 1 of the box 10 into the hole 3.
The box 10 is fixed by screwing the long bolt 14 screwed into the box side fixture provided at the box 6. When the temporary formwork 78 is peeled off after the concrete 9 has hardened, it comes off from the tightening screws 5. When the nut portion 2a is rotated using a trencher or the like, the hole 3 of the fixture main body 2 is disengaged from the long bolt 14, allowing the temporary formwork side fixture 1 to be removed. Furthermore, by removing the long bolts 14 from the box 10, the box 10 is built into the concrete 9, and nothing remains inside the box 10, so that wiring work can be easily accomplished. Further, the removed temporary formwork side fixture 1 can be used again. Furthermore, this temporary formwork side fixture 1 can stably support a box even in the case of a slab, so it has high versatility.

【Example】

Hereinafter, a preferred embodiment of the temporary formwork side fixing device of the box of this invention will be described based on the drawings starting from FIG. The temporary formwork side fixing device 1 of the outlet box shown in FIG. , and a tightening screw 5 protruding outward from the small insertion hole 4. That is, the fixing device main body 2 is made of a hollow cylindrical metal material, and has a hole 3 in the center with a screw carved into the inner peripheral surface. The distal end side of the fixture main body 2 is a nut portion 2a, and the outer peripheral surface is formed into a substantially hexagonal column so that it can be rotated with a trencher or the like. Further, the hole 3 has a small diameter insertion hole 4 at its bottom that communicates with the outside.
A tightening screw 5 made of a wood screw is inserted into the hole. This tightening screw 5 is inserted through the hole 3, its head is latched in the hole 3, and the tip protrudes outward.A screwdriver is inserted into the hole 3, and the tightening screw 5 is tightened and rotated. I'm starting to be able to do it. To fix the outlet box 10 using the temporary form side fixture 1 having the above structure, as shown in FIG. Fasten the fixtures 1 and 1 with screws from the inside. Then, insert the long bolt 1 into the mounting hole 16 on the bottom wall of the outlet box 10 through a nut.
4, and the tip of the long bolt 14 is screwed into the hole 3 of the temporary form side fixture 1 to fix the outlet box 10. After the outlet box 10 is thus positioned at a predetermined position within the opposing temporary formworks 7 and 8, concrete 9 is filled and a concrete structure is formed. Next, the temporary formworks 7 and 8 are removed, but at this time, since the temporary formwork-side fixture 1 is only connected by the tightening screws 5, it can be pulled off simply by pulling strongly. Then, using a trencher,
The fixing device main body 2 is removed from the long bolt 14 by rotating in the direction of removing the locking screw from the nut portion 2a. In addition, the long bolt 14 is also connected to the outlet box 1.
0, it can be rotated in the direction of unscrewing and pulled out from the outlet box 10, making the outlet box completely hollow. In this embodiment, as a structure for screwing the long bolt 14 into the outlet box 10, a screwing structure using a box-side fixture shown in FIG. 5 is used. That is, this box side fixture 26 consists of a washer 20 and a nut 25 fixed to one side of the washer 20. This washer 20 has a ring disk-shaped washer main body 20a with a circular through hole 22 bored in the center.
The cylindrical protrusions 23 are integrally provided and spaced apart from each other at equal intervals. This washer 20 is formed to have a larger diameter than the mounting hole (notch hole) 16 of the outlet box 10, and when the washer 20 is arranged to cover the mounting hole 16, the three protrusions 23 are formed on the peripheral wall of the mounting hole 16. At this time, the through hole 22 of the washer 20 and the mounting hole 16 of the outlet box 10 are formed to be concentric with each other. Further, the height of the protrusion 23 of the washer 20 is formed to be slightly longer than half the wall thickness of the outlet box 10, so that the pair of washers 20, 2 can be placed on both sides of the mounting hole 16 of the outlet box 10.
0', the tips of the opposing protrusions 23, 23' of both washers 20, 20' can come into contact with each other. Nuts 25 are arranged concentrically and welded in advance to the surface of the washer 20 on which the protrusion 23 does not protrude, thereby forming the box-side fixture 26. When installing the outlet box 10 using the box side fixture 26 of this embodiment, the fifth
As shown in the figure, a pair of box-side fixtures 26 are provided on both sides of the mounting hole 16 of the outlet box 10 (having an inner diameter longer than the outer diameter of the long bolt 14).
26' are arranged so that the projections 23, 23' of these box-side fixtures 26, 26' are inserted into the mounting holes 16, respectively, and the nuts 25, 25' of these box-side fixtures 26, 26' are inserted. Screw together the tip of the long bolt 14, and then tighten the nut 25,
25' are tightened together. At this time, as mentioned above, since the height of the protrusion 23 of the washer 20 is formed to be slightly longer than half the wall thickness of the outlet box 10, the height of the protrusion 23 of the washer 20 is slightly longer than half the wall thickness of the outlet box 10. Just before the tightening is completed, the protrusions 23, 23'
The tips of the protrusions 23 come into contact with each other, which prevents the nuts 25, 25' from rotating. At this time, by strongly turning one or both of the nuts 25, 25, the tips of one of the protrusions 23 will touch the other. Protrusion 2
3', and the tightening is completed. The box side fixture 26 of this embodiment includes a washer 20
Since the outer diameter of the bolt is larger than the inner diameter of the mounting hole 16, it is suitable for mounting an outlet box 10 having a larger diameter mounting hole 16 than the long bolt 14. When the mounting hole 16 corresponds to the diameter of the long bolt 14, a nut of the same diameter is inserted into the mounting hole 16.
A long bolt 14 may be screwed onto the nut. In addition, in this invention, the connection (screwing) structure of the long bolt 14 on the box side is not particularly limited, and it goes without saying that other known structures can be used. Next, the outlet box temporary form side fixture 1 shown in FIG. 2 shows a different embodiment in which the fixture main body 2 shown in FIG. 1 has a cover body 6. In addition to the structure of the fixture main body 2, the collar 2b of the fixture main body 2 is hooked and connected to the stepped part 6a at the tip of the hollow truncated conical cover body 6 made of plastic material. It consists of a structure. In this embodiment, the fixture main body 2 and the cover body 6 are separate bodies, but they may be formed integrally. This temporary formwork side fixture 1 is used when fixing to the temporary formwork 8 on the side opposite to the side on which the outlet box 10 is to be opened, as shown in FIG. 4a. That is, the method of attaching the temporary formwork-side fixture 1 to the temporary formwork 8 is the same as that shown in FIG. 3 above. The only difference in installation is that the long bolt 14 screwed into the outlet box 10 is connected in the opposite direction (toward the rear side). After the concrete 9 is filled into the temporary formworks 7 and 8, each temporary formwork is torn off. In this case, the nut part 2a is rotated in the direction of unscrewing and removed from the long bolt 14 together with the cover body 6. The temporary formwork side fixture 1 is removed. Next, attach the long bolt 14 to the box side fixture 2.
Remove it from 6 and pull it out from the concrete 9. As a result, a gap is created in the concrete 9 at the position of the temporary formwork side fixture 1 and the long bolt 14, so that gap can be filled with concrete as in the conventional case. Thereby, the outlet box 10 can be installed without leaving the temporary formwork side fixture 1 in the concrete 9. Furthermore, the temporary formwork side fixture of this invention can also be used in the case of a slab (floor installation), as shown in FIG. 4b. In this case, four temporary formwork side fixtures 1 are screwed upright at four points forming a rectangle on the formwork 7 on the floor.
A long bolt 14 is screwed into each in an upright manner. The upper end of this long piece is attached to the four mounting holes 16 on the bottom wall of the outlet box 10.
Screw on via 6. At this time, by selecting and using a long bolt 14 whose length is adjusted appropriately, the height of the outlet box 10 can be adjusted and the outlet box can be fixed at a desired hollow position. In the above illustrated example of the slab, the temporary formwork side fixture 1 shown in the second figure is used, but it goes without saying that it may also have the structure shown in the first figure. Note that the term "box" in this invention includes various types of boxes embedded in concrete (for example, outlet boxes, concrete boxes, switch boxes, temporary frames, etc.), and is not limited to the above embodiments.

[Effect of the idea]

Since this invention has the above-mentioned structure, there is no need to drill mounting holes in the temporary formwork corresponding to the box installation points and screw them from the outside for installation. It becomes possible to attach frame side fixtures. In addition, since the tightening screws made of wood screws are detachable from the fixture body, they can be replaced depending on the thickness of the temporary formwork. Furthermore, since the work of installing the temporary formwork and the work of installing the boxes are carried out by different workers, using this fixture allows the work to be done without waiting for the work of installing the temporary formwork. This is extremely beneficial as it can improve the efficiency of work. Furthermore, when attaching a box to a wall surface, the temporary formwork side fixtures can be completely removed without being embedded in the concrete, allowing highly reliable work to be carried out without the risk of cracking the concrete. Furthermore, even in the case of a slab, a box can be installed with the same parts in a height-adjustable manner, providing excellent versatility. In addition, since the number of parts required to install the box has been reduced compared to conventional methods, workers do not need to carry many parts while working, and they can be quickly removed from work sites such as high places. It is extremely suitable for work and storage, and can further improve work efficiency. This temporary formwork side fixture is convenient because it can be used again by replacing the tightening screws.

[Brief explanation of drawings]

Fig. 1a is a side view showing a preferred embodiment of the temporary formwork side fixing device for the box of this invention, Fig. 1b is its sectional view, and Fig. 2 is a sectional view showing a different temporary formwork side fixing device. Figure 3 is a cross-sectional view showing the outlet box attached to the wall using the temporary formwork side fixtures shown in Figure 1, and Figure 4a is a cross-sectional view showing the outlet box attached to the wall using the temporary formwork side fixtures shown in Figure 2. A cross-sectional view showing a state in which the letto box is attached to a wall, Figure b is a cross-sectional view showing the case of a slab,
Figure 5 is a sectional view of the main parts showing the outlet box with the box side fixture attached, Figure 6a,
Fig. 7b is a perspective view showing the installation state of a conventional temporary formwork side fixture, Fig. 7a is a cross-sectional view showing a different conventional temporary formwork side fixture installed, and Fig. 7b is a cross-section showing the case of a slab. It is a diagram. 1...Temporary formwork side fixture, 2...Fixing fixture body, 2
a... Nut part, 2b... Flange part, 3... Hole part, 4
... Small insertion hole, 5 ... Tightening screw, 6 ... Cover body, 7, 8 ... Temporary formwork, 10 ... Outlet box, 14 ... Long bolt, 16 ... Mounting hole.

Claims (1)

[Claims for Utility Model Registration] (1) A fixing device main body 2 having a hole 3 with a screw carved into its inner peripheral surface, and a small insertion hole communicating with the bottom of the hole 3 and opening outward. 4, a tightening screw 5 whose head is latched into the small insertion hole 4 and whose tip protrudes outward; and a nut portion whose outer peripheral surface is formed into a polygonal column shape on at least the tip side of the fixture body 2. Temporary formwork side fixture for box consisting of 2a. (2) The box according to claim 1 of the utility model registration, characterized in that the fixing device body 2 has a hollow frustoconical cover body 6 that surrounds the nut portion 2a. Temporary formwork side fixture.