JP2013207852A - Embedded box device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reasonably arrange an embedded box so as to closely contact with a flask even when a reinforcing bar and the flask are at a short distance.SOLUTION: An embedded box device 1 is fitted with a support member 2 for fixing the embedded box 1 by being extended between two reinforcing bars 3 arranged in parallel, the support member 2 comprises first metal fittings 2a fixed to the embedded box 1 and having a first connection portion 10 coupled to one of the reinforcing bars 3, second metal fittings 2b coupled to the first metal fittings 2a to a proper length and having a second coupling portion 20 coupled to the other reinforcing bar 3, and the support member 2 is manufactured so that the front of the embedded box 1 abuts against a flask 4 of reinforced concrete while the embedded box 1 is fixed by coupling the support member 2 to the reinforcing bars 3.

Description

  The present invention relates to an embedded box embedded in a wall surface or pillar made of reinforced concrete, and more particularly to an embedded box device provided with a member for installation and fixing in a formwork into which concrete is poured.

When providing a power outlet, a communication connector, etc. on a wall surface, a power cable and a communication cable are arrange | positioned in a wall surface. When such an outlet or connector is provided on a wall surface, an embedded box having an opening on the front surface is installed on the wall surface, and a metal tube or the like for passing wiring is disposed in the wall surface.
When installing such an embedding box on a reinforced concrete wall or pillar, the position of the embedding box is fixed, and the opening surface is closely attached to the formwork to prevent the poured concrete from entering the embedding box from the opening. Must be installed. In order to meet this requirement, the present inventor has proposed an embedded box device shown in Patent Document 1.
This is one in which a support fitting is spanned between the upper and lower reinforcing bars, and the box is connected to the support fitting via an adjustable portion.

JP 2011-182584 A

In the case of the configuration of Patent Document 1, an adjustment unit that moves the embedding box back and forth according to the distance from the reinforcing bar to the formwork is provided, so that even if the distance between the rebar and the formwork is different, it is reliably buried. The front of the box was in close contact with the formwork. However, when the distance between the reinforcing bar and the formwork is short, the length of the adjusting unit becomes a hindrance, and the case where the adjusting unit cannot be installed even when the length of the adjusting unit is minimized occurs. In addition, the upper rebar is fixed with bolts, but it is easy to move in the axial direction of the rebar simply by pinching the lower rebar from the front and back. There was a case of tilting.
On the other hand, the specifications of reinforced concrete are determined at the building design stage, and the distance between the reinforcing bar and the wall surface is also specified at that stage. Therefore, the distance between the reinforcing bar and the formwork can be grasped at the design stage, and the embedded box device can be manufactured in accordance with the distance.

  Therefore, in view of such a problem, the present invention allows the box to be arranged so as to be in close contact with the formwork even when the distance between the reinforcing bar and the formwork is short, and the connecting member of the embedding box is moved and embedded. An object is to provide an embedded box device in which the box does not tilt.

In order to solve the above problems, the invention of claim 1 is an embedded box device in which an embedded box having an opening on a front surface is fixed to a reinforcing bar so that the opening is exposed on the surface and embedded in reinforced concrete. The embedding box has a support member attached to the back portion for fixing the embedding box between two rebars arranged in parallel. A first support member having a connecting portion to the embedded box and a fixing portion to the embedding box, and a second support having a connecting portion to the other reinforcing bar and connected to the first support member by appropriately changing the length. When the both connecting portions are connected to a reinforcing bar, the front and rear positions of the connecting portion with respect to the embedded box so that the front surface of the embedded box is in contact with the formwork of reinforced concrete. Is set Characterized by comprising Te.
According to this configuration, the embedding box can be fixed in close contact with the formwork by simply connecting the support member to the reinforcing bar. Further, even if the distance between the reinforcing bar and the formwork is different from the thickness of the embedding box, the supporting member can be coped with by providing a step or the like on the supporting member and moving the embedding box back and forth, and can be fixed well. And since this distance is determined in the stage which designs a building, a supporting member can be produced beforehand and can be constructed | assembled satisfactorily.

According to a second aspect of the present invention, in the configuration according to the first aspect, both of the connecting portions of the support member to the reinforcing bars are fixed by fastening bolts.
According to this configuration, since the connecting portions of both the upper and lower rebars are screwed with bolts, the connecting portions can be firmly fixed, and the connecting portion does not move due to the pressure of concrete pouring and the embedded box does not tilt. .

  According to the present invention, the embedding box can be fixed in close contact with the formwork simply by connecting the support member to the reinforcing bar. Further, even if the distance between the reinforcing bar and the formwork is different from the thickness of the embedding box, the supporting member can be coped with by providing a stepped portion on the supporting member and moving the embedding box back and forth, and can be fixed well. And since this distance is determined in the stage which designs a building, a supporting member can be produced beforehand and can be constructed | assembled satisfactorily.

It is explanatory drawing which showed an example of the embedding box apparatus which concerns on this invention, and was seen from the side. It is a front view of FIG. It is explanatory drawing seen from the side which shows the state in the middle of mounting | wearing with the reinforcing bar of FIG. It is explanatory drawing seen from the side which shows the other form of an embedding box apparatus. It is explanatory drawing seen from the side which shows the other form of an embedding box apparatus.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings. 1 and 2 show an example of an embedded box device according to the present invention, FIG. 1 is an explanatory view as viewed from the side attached to a reinforcing bar, and FIG. 2 shows a front view. 1 and 2, 1 is an embedding box, 2 is a support metal fitting, 3 is a reinforcing bar, and 4 is a formwork.

  The embedded box 1 is a metal box having an opening 1a on the front surface, and is embedded in a column or wall formed of reinforced concrete so that the front surface is exposed.

  The support member 2 is a metal plate that is formed long in the vertical direction, and includes two members, a first metal fitting 2a and a second metal fitting 2b. The first metal fitting 2 a is formed to extend upward from the back surface of the embedded box 1 and is welded to the back surface of the embedded box 1. A first connecting portion 10 that is connected to the upper reinforcing bar 3 is formed at the tip that is the upper end, and a base portion that is the lower end is arranged so as to protrude below the embedded box 1 and is connected to the second metal fitting 2b. 11 is formed.

The first connecting portion 10 is formed by folding the tip end portion of the first metal fitting 2 a backward in an arc shape, and forms a cylindrical portion that holds the reinforcing bar 3. Further, a nut 13 for fastening with the bolt 12 to the main body of the first metal fitting 2a is welded at the folded end, and an insertion port 14 for inserting the bolt 12 is formed in the front surface facing the first metal fitting 2a. The bolt 12 is screwed into the nut 13 through the insertion port 14 from the front.
Further, the connecting piece 11 has a hole 16 through which a bolt 15 for connection is inserted, and a nut 17 for screwing the bolt into the back is welded.

In the second metal fitting 2b, a second connecting portion 20 connected to the reinforcing bar 3 is formed at the tip serving as the lower end, and a connecting portion 21 connected to the connecting piece 11 is formed at the base serving as the upper end.
As shown in FIG. 2, the second connecting portion 20 is divided into three by providing two longitudinal grooves 20c in the length direction of the second metal fitting 2b, and forming three support pieces 22a, 22b, 22c alternately. The accommodating part 20a which inserts the reinforcing bar 3 is formed by bending back and forth. Specifically, the base portions of the left and right support pieces 22a and 22c are bent in an arc shape so as to have a rearward bulge, while the base portion of the central support piece 22b is bent in an arc shape so as to have a forward bulge to form an accommodating portion. The leading end portions are bent outward to form introduction portions 20b for guiding the reinforcing bars 3.
The connecting portion 21 is formed with a vertically long elongated hole 21a for inserting the bolt 15, and the second metal fitting 2b is expanded and contracted with respect to the first metal fitting 2a (relative to the embedded box 1). It can be connected with.

1 shows a case where the distance L1 from the reinforcing bar 3 to the formwork 4 is substantially the same as the thickness (depth) of the embedding box 1. In this case, the entire support member 2 need only be formed in a flat plate shape. In the embedding box device assembled to the reinforcing bar 3 with this configuration, the opening 1 a of the embedding box 1 is in close contact with the mold 4. Further, the ribs 18 of the vertical bars formed on the support member 2 are provided for reinforcement, and are appropriately formed at a site.
Moreover, the embedding box 1 may be made of a synthetic resin. In this case, the first metal fitting 2a is fixed to the embedding box 1 with bolts or screws. Further, the nut 17 is formed with a thickness of about one half of the reinforcing bar 3, and is configured such that the front surface of the embedded box 1 parallel to the support member 2 is vertical when attached to the reinforcing bar 3.

The embedded box device described above is attached to the reinforcing bar 3 as follows. First, in a state where the first metal fitting 2a and the second metal fitting 2b are connected, the first connecting portion 10 is inserted into the reinforcing bars 3 disposed horizontally among the reinforcing bars 3, 3. Reinforcing bar 3 is inserted by pressing mouth 10a against reinforcing bar 3 from above. At this time, the insertion port 10a is preferably widened so that the rebar 3 can be easily inserted.
Thus, when the reinforcing bar 3 is inserted into the first connecting part 10, the bolt 12 is inserted from the front and tightened. FIG. 3 shows a state in which the bolt 12 is screwed. Although FIG. 3 shows a state in which the mold 4 is attached, it is preferable in terms of work that the mold 4 is installed after the embedding box device is installed.

Next, the connection part 21 of the 1st metal fitting 2a and the 2nd metal fitting 2b is loosened, and the lower part which the 2nd connection part 20 opened is pressed against the reinforcing bar 3 to be connected from above. With this pressing force, the reinforcing bar 3 is guided to the introduction part 20b of the second connecting part 20 and pushed into the accommodating part 20a to be gripped.
When the first connecting part 10 and the second connecting part 20 are connected to the reinforcing bars 3 and 3, respectively, the bolt 15 of the connecting part 21 is tightened to integrate the first metal fitting 2a and the second metal fitting 2b, thereby completing the mounting operation. This state is the state shown in FIG. 1, and the embedding box device in which the amount of protrusion of the embedding box 1 is set in accordance with the distance L1 between the reinforcing bar 3 such as the wall to be constructed and the formwork 4 by this mounting operation. Thereafter, it is in good contact with the installed formwork 4.

  Thus, if the distance L1 between the upper and lower reinforcing bars 3 and 3 and the mold 4 for contacting the embedding box 1 is about the thickness of the embedding box 1, the support member 2 is simply a straight plate. The embedding box 1 can be fixed in close contact with the mold 4. And since the distance L1 from the reinforcing bar 3 to the formwork 4 is determined at the stage of designing the building, the shape of the support member 2 can be prepared in advance and can be satisfactorily constructed.

  FIG. 4 shows another embodiment of the embedded box device. The structure of the 2nd connection part 20 provided in the 2nd metal fitting 2b differs from the form of FIG. 1, and becomes a structure bolted similarly to the 1st connection part 10. FIG. However, the first connecting portion 10 is configured to be opposite in the front-rear direction. Specifically, it is formed in a cylindrical shape so as to hold the reinforcing bar 3, and is formed by folding the front end portion of the second metal fitting 2b forward in an arc shape. Further, a nut 26 for fastening with the bolt 25 to the main body of the second metal fitting 2b is welded at the folded end, and an insertion port (not shown) for inserting the bolt 25 is formed in the opposite back surface. ing. The bolt 25 is screwed into the nut 26 from the rear through the insertion port and fastened.

  In the case of this structure, attachment to the reinforcing bar 3 connects the 2nd connection part 20 first. Specifically, the 1st metal fitting 2a and the 2nd metal fitting 2b are isolate | separated, the insertion port 20c which faces the upper direction of the 2nd connection part 20 is pressed against the reinforcing bar 3, and it inserts from below. When the reinforcing bar 3 is inserted, the bolts 25 are inserted from the rear to be fastened and fixed.

Next, the first metal fitting 2 a is connected to the reinforcing bar 3. The 1st metal fitting 2a presses the 1st connection part 10 with respect to the reinforcing bar 3 from the upper direction with respect to the reinforcing bar 3 above the 2nd metal fitting 2b, and inserts the reinforcing bar 3. FIG. When the reinforcing bar 3 is inserted into the first connecting portion 10, the first metal fitting 2 a and the second metal fitting 2 b are connected with the bolt 15 before being fastened with the bolt 13. Thereafter, the bolt 13 is tightened to fix the first connecting portion 10.
FIG. 4 shows a state where the bolt 15 is being screwed. In the case of this configuration, the nut 17 welded to the connecting piece 11 of the first metal fitting 2a is shown in a state in which a nut 27 is additionally stacked in order to prevent the embedded box 1 from being inclined.

As described above, the second connecting portion 20 may also be fixed by the bolt 25. By using the bolt 25, the second connecting portion 20 is not displaced due to the pressure of pouring the concrete, and the stable state is maintained.
Further, by fixing both the upper and lower parts with bolts, the supporting member 2 is stretched over the reinforcing bars 3 and 3 that are erected on the left and right instead of between the upper and lower reinforcing bars 3 and 3 to fix the embedded box 1. This also makes it possible to respond flexibly to the installation environment.

FIG. 5 shows still another embodiment of the embedded box device. The configuration of FIG. 1 is different from the configuration of FIG. 1 in that the support member is not a uniform plate shape, but is a support member 30 in which the embedded box 1 is arranged on a convex portion formed by providing a stepped portion. Such a support member 2 is used when the distance L2 between the reinforcing bar 3 and the formwork 4 is larger than the distance L1 in FIG.
Specifically, both the first metal fitting 30a and the second metal fitting 30b constituting the support member 30 have a step portion 31 having a height H1 in accordance with the distance L2 so that the front surface of the embedded box 1 is in contact with the mold 4. The convex portion 31a is formed on the support member 30, and the embedded box 1 is pushed forward and arranged.

  Thus, when the distance between the reinforcing bar 3 and the formwork 4 is larger than the thickness of the embedding box 1, the support member 30 is provided with the step portion 31 so that the embedding box 1 protrudes forward to the formwork 4. It can be adhered and fixed well. And since this distance is determined in the stage of designing a building, even if the support member 30 is the shape provided with the step part 31, it can produce beforehand and can construct it favorably.

  In addition, what is necessary is just to bend the step part 31 formed in the supporting member 30 in the reverse direction, when the distance between the reinforcing bar 3 and the formwork 4 is shorter than the thickness of the embedding box 1. Moreover, the site | part which forms the step part 31 does not need to be in the middle of the support member 30, for example, you may form it by bending the 1st connection part 10 and the 2nd connection part 20 back or forward.

  1 .... Embedded box, 2 .... support member, 2a..first bracket (first support member), 2b..second bracket (second support member), 3..reinforcing bar, 4 .... form, 10. 1st connection part (connection part), 20 ... Second connection part (connection part), 30 ... Support member, 31 ... Step part.

Claims (2)

An embedding box device having an embedding box having an opening on the front surface and being embedded in a reinforced concrete by being fixed to a rebar so that the opening is exposed on the surface,
In the embedded box, a support member for fixing the embedded box across two reinforcing bars arranged in parallel is attached to the back,
The support member is connected to a first support member having a connection portion with one reinforcing bar and a fixing portion to the embedded box, and is connected to the first support member by appropriately changing the length. And a second support member having a connecting portion of
When both the connecting portions are connected to a reinforcing bar, the front and back positions of the connecting portion with respect to the embedded box are set so that the front surface of the embedded box is disposed at a position where the front surface of the embedded box comes into contact with a reinforced concrete formwork. Embedded box device. 2. The embedded box device according to claim 1, wherein both of the connecting portions of the support member to the reinforcing bars are fixed by fastening bolts.

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