JP3908110B2 - Box construction tool and box device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a box erection tool and a box device for fixing a box embedded in a concrete rebar before placing concrete.
[0002]
[Prior art]
Japanese Patent Publication No. 4-19336 as one of the construction tools used to fix the box to the reinforcing bars with the front opening of the box buried in concrete in close contact with the formwork before placing the concrete. Are disclosed. The basic structure of this installation tool consists of a mounting plate for mounting a concrete-embedded box with its bottom wall in contact with the mounting plate, and a horizontal mounting on the upper and lower ends of the mounting plate. And a support bar that generates a tensile force by being bent to be fixed to the reinforcing bars, and the mounting plate is inserted and locked in a hole described later provided in the bottom wall of the box , and is attached to the mounting plate. A pair of locking pieces for attaching the box is formed by cutting and raising the front side.
[0003]
The pitch (interval) of the pair of locking pieces cut and raised on the front surface side of the mounting plate of the construction tool is equal to the pair (or plural) holes for inserting nails or the like provided on the bottom wall of the box. Corresponds to pitch (interval). Then, the box is installed on the surrounding support material via the installation tool using the hole provided in the bottom wall of the box. Here, the pitch of a pair (or a plurality of) holes provided in the bottom wall of the box is defined in JIS C8340. For example, in the case of an outlet box, a pair of holes The pitch is normally 65 mm, but in a box slightly smaller than this, it is 60 mm.
[0004]
Therefore, in the conventional installation tool, since the pitch of the pair of locking pieces provided on the mounting plate is constant, as described above, the pitch of the pair (or plural) holes provided on the bottom wall is slight. However, there is a problem that two types of installation tools corresponding to this are required.
[0005]
[Problems to be solved by the invention]
The problem of the present invention is that the pitch of the pair of locking pieces cut and raised on the mounting plate can be selected from two slightly different types, and the pitch of the one or more locking piece insertion holes can be selected. The present invention is to provide a box erection tool and a box device capable of erection of two different types of boxes.
[0006]
[Means for Solving the Problems]
The invention of claim 1 for solving the above-described problems includes a mounting plate for mounting the box , a support bar fixed to the upper and lower portions of the mounting plate in the lateral direction, and both ends fixed to the surrounding support material, wherein the the mounting plate, is engaged by bending is inserted into the pair of engaging pieces insertion hole passing through in the bottom wall of the box, the front pair of locking pieces for attaching the box to the mounting plate A box construction tool formed by cutting and raising to the side, wherein the first and second boxes having different pitches of the pair of locking piece insertion holes are provided at the base end portion of each locking piece in the mounting plate. In order to enable attachment, a notch for changing the pitch of the pair of locking pieces is provided extending in the cut-and-raised direction, and the pitch of the initial pair of locking pieces is the first pitch of the first box. Use a gripping tool such as pliers. , The pitch of the pair of locking pieces after cutting and raising the maximum a pair of locking pieces in the portion of the cut is characterized by being configured to match the second pitch in the second box. According to the first aspect of the present invention, the pitch of the pair of initial locking pieces cut and raised toward the front surface of the mounting plate is a pair of boxes provided on the box mounted on the contact surface of the front surface of the mounting plate. In correspondence with the pitch of the locking piece insertion holes, the first pitch in which the cut remains, and the locking pieces are formed by cutting and raising the locking pieces to the maximum along the cut, and are slightly larger than the first pitch. One of the two types of different second pitches is selected. Therefore, two types of boxes with different pitches of the pair of locking piece insertion holes can be installed with one type of installation tool. For this reason, the kind of installation tools which should be held decreases, and construction, management of installation tools, etc. become easy.
[0007]
The invention of claim 2 is characterized in that, in the invention of claim 1, the pair of locking pieces are cut and raised toward the inside of the mounting plate. According to the invention of claim 2, since the cut and raised groove of the locking piece does not remain in the portion near the center of the mounting plate to which the attracting tool is screwed, it is possible to prevent the strength of the mounting plate from being lowered. .
[0008]
Further, the invention of claim 3 can attach the invention of claim 1 to the box construction tool according to the invention of claim 1 and the box construction tool, and the pitch of the pair of locking piece insertion holes can be adjusted. It is grasped as a combination with two different types of boxes, and is substantially the same as the invention of claim 1.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to embodiments. FIG. 1 is a perspective view of a box framing tool K _{1 according to} the first embodiment of the present invention, and FIG. 2 is a perspective view of a state where the box framing tool K ₁ and a box B attached thereto are separated. 3 is a front view of the box construction tool K ₁ , FIG. 4 is a cross-sectional view taken along the line XX of FIG. 3, and FIG. 5 is a construction of the box B using the box construction tool K _1. FIG. 6 is an enlarged sectional view taken along line YY of FIG. 5.
[0010]
1 to 4, a box installation tool (hereinafter simply referred to as “installation tool”) K ₁ includes a mounting plate 10 with which the bottom wall 1 of the box B abuts the front surface thereof, and upper and lower portions of the mounting plate 10. It is comprised with a pair of support bar 30 fixed to the both ends. The mounting plate 10 is formed by press forming a metal plate and then performing curl forming. That is, a short cylindrical female thread forming tube portion 11 is formed at the center of the mounting plate 10 so as to protrude toward the back side by burring, and the mounting plate 10 is formed on the left and right sides of the female screw forming tube portion 11. The upper and lower mounting plate portions 10a and 10b are successively formed at portions shifted by the same amount. Therefore, each of the upper and lower mounting plate portions 10a and 10b has a vertically long rectangular shape, and its connecting portion is a conduit (not shown) connected to the knockout hole 6 of the bottom wall 1 of the box B. It is formed in an arc shape corresponding to the outer diameter. That is, the overall shape of the mounting plate 10 is a non-rectangular shape, and each of the mounting plate portions 10a and 10b constituting the mounting plate 10 has a point-symmetrical shape (each mounting plate portion When one of 10a and 10b is half-rotated around the female thread forming cylinder portion 11, the shape matches the other.
[0011]
A pair of locking pieces 12 are located on the side of the abutment surface 13 on the front surface and on the inner side (internal thread formation) at the symmetrical positions directly above and below the internal thread forming cylinder 11 in the upper and lower mounting plate portions 10a and 10b. It is cut and raised toward the cylindrical portion 11 side. For this reason, the pair of locking pieces 12 are located at the same position along the vertical direction from the female thread forming cylinder portion 11, and the width direction (lateral direction) is set to each of the upper and lower mounting plate portions 10 a and 10 b. ) Along the opposite ends of each other.
[0012]
Further, linear ribs 14 bulge to the back side and are formed in the vertical direction on the sides of the pair of locking pieces 12 in the mounting plate 10, and ring ribs 15 are formed on the outer periphery of the female thread forming cylinder portion 11. Are also formed to bulge to the back side, and the ribs 14 and 15 are connected to each other. By providing the mounting plate 10 with the linear rib 14 and the ring rib 15, the entire mounting plate 10 is reinforced. A female screw 16 (see FIG. 4) is formed in the female screw forming cylinder portion 11 for screwing a leading end portion of a pulling bolt 44 described later.
[0013]
Further, at the time of press molding, a rectangular shape for forming support bar insertion fixing portions 17 which are upper and lower ends of the mounting plate 10 and which are fixed by inserting the support bars 30 at both ends in the width direction of the portions. A total of four plate-like parts (not shown) are formed by punching at the same time. Then, after the press molding, the four plate-like portions are curled in a substantially ring shape in cross section toward the front surface side of the mounting plate 10, and predetermined in the lateral direction at the upper and lower ends of the mounting plate 10. A total of four support bar insertion fixing portions 17 are formed, each having two spaces. The support bar insertion fixing portion 17 is a portion for inserting and fixing the support bar 30, and the inner diameter after molding is slightly larger than the outer diameter so that the support bar 30 can be inserted. The upper and lower support bars 30 are inserted into a pair of support bar insertion fixing portions 17 with a predetermined interval along the horizontal direction, and then the support bar insertion fixing portions 17 are caulked to slightly deform, The support bar 30 is integrally fixed to the mounting plate 10. In FIG. 1 to FIG. 4, reference numeral 18 denotes a cut-and-raised groove formed in the mounting plate 10 by cutting and raising the pair of locking pieces 12, and 19 denotes both sides of the central female screw forming cylinder portion 11. In FIG. 1 to FIG. 3, FIG. 7 and FIG. 8, reference numeral 21 denotes “caulking traces” remaining on the surface of the support bar insertion fixing portion 17.
[0014]
As shown in FIGS. 1 to 4, after the press molding of the mounting plate 10, the initial pitch (interval) of the pair of locking pieces 12 is a standard pitch (P ₁ ), A pair of cuts 22 are connected to the cut and raised grooves 18 along the cutting and raising direction of the locking pieces 12 (inward direction of the mounting plate 10) at the base end portion of each locking piece 12 in the mounting plate 10. Is provided. The length (L) of the incision 22 (see FIG. 3) is the maximum in the direction in which the pair of locking pieces 12 are raised and raised using a gripping tool T such as pliers as shown in FIG. , The special pitch (P ₂ ) (see FIGS. 4 and 8) of the pair of locking pieces 12 ′ after the cut and raise becomes a target pitch larger than the standard pitch (P ₁ ). It is set to such a length. For example, in the case of an outlet box, the standard pitch (P ₁ ) is 60 mm, and the special pitch (P ₂ ) is 65 mm.
[0015]
Further, the support bar 30 is made of an iron wire having a diameter of about 4 mm and can be bent by hand. As shown in FIG. 5, a pair of support bar insertions formed at the upper and lower ends of the mounting plate 10, respectively. The support bars 30 are respectively inserted into the fixing portions 17 and the support bar insertion fixing portions 17 are caulked so that the center portions of the pair of upper and lower support bars 30 are integrally fixed to the mounting plate 10.
[0016]
Further, as shown in FIG. 2, the box (outlet box) B embedded in the concrete is formed with a bolt insertion hole 2 through which a pulling bolt 44 is inserted at the center of the bottom wall 1, and the bolt insertion. A pair of locking piece insertion holes 3 are formed above and below the hole 2 as a center. The pitch of the pair of locking piece insertion holes 3 is the same as the standard pitch P ₁ of the pair of locking pieces 12 provided at the time of press molding on the mounting plate 10 of the installation tool K ₁ for mounting the box B. . Further, a total of four tapping screw lower holes 4 are formed in the bottom wall 1 at equal intervals in the circumferential direction with the bolt insertion hole 2 as the center. When the box B is attached to the front surface of the mounting plate 10 of the installation tool K _{1 by} a pair of locking pieces 12 when the mounting strength is insufficient, the tapping screw pilot hole 4 is provided on the mounting plate 10. The tapping screw inserted through the insertion hole 19 is screwed in to compensate for the insufficient mounting strength. A large number of knockout holes 6 are formed in the bottom wall 1 and the peripheral wall 5 of the box B, and those not used are covered with a closing lid 7.
[0017]
Then, using the erection device K _1, to place the box B to be embedded in the concrete in a predetermined position is performed as follows. First, the back surface of the bottom wall 1 of the box B is brought into contact with the contact surface 13 on the front surface of the mounting plate 10 of the mounting tool K ₁ , and a pair of standard pitches (P ₁ ) provided on the mounting plate 10 is provided. The locking piece 12 is inserted into a pair of locking piece insertion holes 3 having a standard pitch (P ₁ ) provided in the bottom wall 1 of the box B, and the portion protruding from the inner surface of the bottom wall 1 is the bottom wall. 1 is bent toward the center side (see FIG. 6). Thereby, the box B is attached to the contact surface 13 on the front surface of the mounting plate 10 via the pair of locking pieces 12. If the mounting strength is insufficient with only the pair of locking pieces 12, the tapping screw inserted into the tapping screw insertion hole 19 provided in the mounting plate 10 is screwed into the tapping screw lower hole 4 of the box B. In combination, the shortage of strength is compensated as described above.
[0018]
Next, as shown in FIG. 5, both end portions 30a of the pair of upper and lower support bars 30 constituting the erection device K ₁ by folding the back side, using a wire 45 or the like fixed to the reinforcing bar 41 in the vicinity thereof The front opening of the box B is brought into close contact with the inner surface side of the mold 42 leaning against the concrete placement position by the tension generated by bending the support bar 30 to the back side, and this state is maintained. . Further, the drawing bolt 44 is inserted into the inside through a bolt insertion hole 43 provided in the mold frame 42, and the tip thereof is a female screw on the inner peripheral surface of the female screw forming cylinder portion 11 formed at the center of the mounting plate 10. 16, the box B is pulled toward the mold frame 42, and the open end surface of the box B is securely adhered to the inner surface of the mold frame 42. In this state, when concrete is placed inside the formwork, the box B is embedded in the concrete after the hardening. It should be noted that the opening end surface of the box B is in close contact with the inner surface of the mold frame 42 with an adhesion force that does not allow the concrete to flow in only by “stretching force” generated by bending both ends of the support bar 30 to the back side. In some cases, it is not necessary to use the pulling bolt 44.
[0019]
On the other hand, when attaching another box having a special pitch (P ₂ ) slightly smaller than the standard pitch (P ₁ ), the pair of locking piece insertion holes provided in the bottom wall is shown in FIG. As shown, a pair of locking pieces 12 projecting to the front surface side of the mounting plate 10 are gripped using a holding tool T such as pliers, and the direction in which the locking pieces 12 are raised (first embodiment) In the form, the locking piece 12 is cut up to the maximum inward. Since the mounting plate 10 is provided with two cuts 22 that are continuous to the edge in the width direction of the cut and raised groove 18 at the time of press molding, the locking piece 12 is shown in FIG. As described above, the pitch of the pair of locking pieces 12 ′ is further cut and raised by an amount corresponding to the length (L) of the cut 22 and becomes a special pitch (P ₂ ).
[0020]
Therefore, each locking piece 12 is cut and raised to the maximum, and the pitch of the pair of locking pieces 12 ′ is set to the special pitch (P ₂ ), so that the same installation tool K ₁ is used to provide the bottom wall. It is possible to attach another box having a special pitch (P ₂ ) in which the pitch between the pair of engaging piece insertion holes is slightly smaller than the standard pitch (P ₁ ). Thus, by one erection tool K _1, it is possible to attach the two boxes.
[0021]
Further, in the construction tool K ₁ of the first embodiment, the pair of locking pieces 12 provided on the mounting plate 10 are cut and raised toward the inside, so that the drawing bolts 44 are screwed together. Since the cut and raised groove 18 is not formed at the center of the plate 10, there is an advantage that the strength of the mounting plate 10 is hardly lowered. However, like the construction tool K ₂ of the second embodiment of the present invention shown in FIG. 9, the pair of locking pieces 12 are formed by being cut and raised outward, and are continuous with the cut and raised groove 18. The thing of the structure provided with the notch 22 in the outer side is also considered. The bridge member K ₂ has a standard pitch (P ₁₁ ) of the pair of locking pieces 12 at the time of press molding, and is formed by cutting and raising the pair of locking pieces 12 and maximally outward along the grooves 18. It is smaller than the special pitch (P ₁₂ ) of the pair of locking pieces 12 ′.
[0022]
Also, the overall shape of the mounting plate 10 may be rectangular.
[0023]
Moreover, the construction example is a case where the box B are embedded in the concrete, a pair of support bars 30 constituting the erection device K ₁ is fixed to the periphery of the reinforcing bar 41 by bending both ends thereof to the rear side Thus, a tensile force is generated, and the box B is brought into contact with the back surface side of the mold frame 42 by the tensile force. However, the installation tool according to the present invention can also be used in a construction example in which a box is disposed between two adjacent pillars that constitute a lightweight partition wall. In the case of this construction example, both ends of the pair of upper and lower support bars 30 constituting the installation tool are fixed to the two studs in a straight state without being bent. Further, specifically, the end portion of the support bar 30 is inserted and fixed in the insertion hole drilled in each opposing plate portion of the two studs. Even in the case of the latter construction example, when the pitch of the pair (or plural) of locking piece insertion holes 3 provided on the bottom wall of the box disposed between the two studs is slightly different, the former Similarly to the case of the construction example, the pair of locking pieces 12 protruding from the front surface of the mounting plate 10 may be further cut and raised along the cuts 22 to slightly change the pitch.
[0024]
Further, each of the construction tools K ₁ and K ₂ has a configuration in which a pair (two) of independent support bars 30 are fixed to the upper and lower ends of the mounting plate 10, In the example where both ends of the support bar 30 positioned are fixed to the surrounding support material (in the former construction example, the reinforcing bar 41 and in the latter construction example, the two pillars constituting the lightweight partition wall). is there. However, the "support bar" constituting the installation tool of the present invention does not necessarily need to be composed of two independent pieces, but one iron wire is bent into a U-shape and the parts parallel to each other are attached to the mounting plate. What is fixed to the upper and lower ends of is also included. In this configuration, the “both ends” of the support bar are both ends of one iron wire that constitutes the support bar, and are bent in a U shape so that they are located on one side of the box disposed at a predetermined position. Will be located. In other words, the box is supported in a cantilever manner by a support bar in which one iron wire is bent into a U-shape.
[0025]
【The invention's effect】
The box construction tool according to the present invention is provided with a notch for changing the pitch of the pair of locking pieces at the base end portion of each locking piece in the mounting plate, extending in the cutting and raising direction, The pitch of the pair of locking pieces is changed by maximally raising the pair of locking pieces along the cut, and the same installation tool has locking pieces of two different pitches. Become. Therefore, two types of boxes with different pitches of the pair of locking piece insertion holes are installed by selecting one of the two types of pitches of the pair of locking pieces provided on the mounting plate constituting the installation tool. it can.
[Brief description of the drawings]
FIG. 1 is a perspective view of a box framing tool K1 according to a _first embodiment of the present invention.
FIG. 2 is a perspective view showing a state in which a box framing tool K ₁ and a box B attached thereto are separated.
FIG. 3 is a front view of a box framing tool K ₁ .
4 is a cross-sectional view taken along the line XX of FIG.
FIG. 5 is a plan view showing a state where a box B is installed using the box installation tool K ₁ .
6 is an enlarged sectional view taken along line YY in FIG.
FIG. 7 is a perspective view of the box framing tool K _{1 in} the middle of further cutting and raising the pair of locking pieces 12 using the gripping tool T and setting the pitch to a special pitch (P ₂ ).
FIG. 8 is a perspective view of the box framing tool K _{1 in} the same state after being cut and raised.
FIG. 9 is a perspective view of a box framing tool K _{2 according to} a second embodiment of the present invention.
[Explanation of symbols]
B: Box
K ₁ , K ₂ : Box installation tool
P ₁ , P ₁₁ : Standard pitch of the pair of locking pieces (first pitch)
P ₂ , P ₁₂ : Special pitch of the pair of locking pieces (second pitch)
1: Bottom wall of box
3: Locking piece insertion hole
10: Mounting plate
12: Locking piece
22: Cutting
30: Support bar
41: Rebar (support material)

Claims (3)

A mounting plate for mounting the box, and a support bar fixed laterally to the upper and lower portions of the mounting plate and having both ends fixed to surrounding supporting materials,
The mounting plate is locked by being inserted and bent through a pair of locking piece insertion holes penetrating the bottom wall of the box , and the pair of locking pieces for attaching the box to the mounting plate is cut to the front side. A box construction tool formed by raising,
The pitch of the pair of locking pieces is changed so that the first and second boxes having different pitches of the pair of locking piece insertion holes can be attached to the base end portion of each locking piece on the mounting plate. The incision to do is extended in the cutting and raising direction,
The pitch of the initial pair of locking pieces matches the first pitch of the first box, and using a gripping tool such as pliers, the pair of locking pieces is cut and raised to the maximum at the cut portion. A box construction tool characterized in that the pitch of the pair of locking pieces after the second pitch is configured to match the second pitch of the second box. The box construction tool according to claim 1, wherein the pair of locking pieces are cut and raised toward the inside of the mounting plate. The 1st box provided with a pair of locking piece insertion hole which consists of a 1st pitch, The 2nd box provided with a pair of locking piece insertion hole which consists of the 2nd pitch which is different from the 1st pitch, The claim 1 It consists of the box construction tool described in
The pitch of the initial pair of locking pieces of the installation tool matches the first pitch of the first box, and a pair of locking pieces are formed at the incision portion using a gripping tool such as pliers. The box device characterized in that the pitch of the pair of locking pieces after being cut and raised to the maximum matches the second pitch of the second box.

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