JP2009156016A - Blocking metal fitting for concrete form - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blocking metal fitting for a concrete form which can be used in fixing many kinds of reinforcements with different diameters, and furthermore can be used in fixing and connecting not only a separator for the concrete form but also other kinds of metal members. <P>SOLUTION: The blocking metal fitting is composed of a metal fitting body and a wedge member for fixing the reinforcement placed on a base of the metal fitting body. The metal fitting body includes a receiving concave and a pair of support pieces opposing and standing from both sides of the receiving concave. The pair of support pieces have a pair of wedge-guide holes opposing each other in a direction crossing the receiving concave, and furthermore have a plurality of wedge-guide holes of different heights in correspondence to a plurality of the reinforcements with different diameters placed on the base. The wedge member includes a reinforcement hold-down part in the insertion direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a root metal fitting for concrete formwork, and is particularly effective in dealing with a plurality of reinforcing bars having different diameters with a single metal fitting.

When constructing various concrete structures such as concrete walls and concrete columns, first assemble a concrete formwork to be a mold, cast concrete into the formwork, dismantle the formwork after curing the concrete, Removed.
Usually, a reinforcing bar protruding from an existing concrete slab is used, and a concrete formwork is fixed using a fixing metal fitting, or another reinforcing bar is fixed.
Therefore, there are various sizes of reinforcing bars to fix the root braces, so it is necessary for the contractor to have stocks of root braces that correspond to the reinforcing bars of each diameter, and inventory management by type is difficult. There was a problem that the construction was interrupted even if some kinds of metal fittings were missing.
Japanese Patent Application Laid-Open No. 10-280683 discloses a U-shaped steel plate, but the fixing of the reinforcing bars is unstable, and although two sets of wedge holes are disclosed in FIGS. There is no disclosure of usage.
Therefore, when the usage is estimated, it seems that the wedge hole is selected depending on the thickness of the reinforcing bar and the amount of the fixing bolt inserted, but it cannot cope with many types of reinforcing bars having different diameters.
Moreover, the problem of a U-shaped cross-section metal fitting will be described with reference to FIG.
As shown in FIG. 14A, when trying to cope with a plurality of reinforcing bars having different diameters, the opening width of the metal fitting 110 becomes an arcuate concave surface 123 matched to the reinforcing bar 1a having the largest diameter.
Then, as shown in FIG. 14 (b), in the rebar 1d having a small diameter, a gap is formed on both sides of the rebar 1d. As shown in FIG. 14 (c), the reinforcing bar 1d is not stable and is likely to be in an insufficient clamping state.
Further, as shown in FIG. 14 (d), as seen from the opening side of the concave surface 123, the unstable reinforcing bar in which the reinforcing bar 1 d is inclined in the concave surface 123 is likely to be sandwiched, the wedge member 130 is loosened, and the metal fitting 110 is There was also a risk of disconnection from the reinforcing bar 1d.

JP-A-10-280683

  In view of the above technical problem, the present invention can be used to fix various types of reinforcing bars with different diameters with a single metal fitting, and can be used not only for the separator of a formwork but also for fixing and connecting various other metal members. It aims at providing the root clasp for formwork.

  A concrete form fixing root metal fitting according to the present invention includes a metal fitting main body and a wedge member for fixing a reinforcing bar placed on the base of the metal fitting main body. The metal fitting main body includes a receiving recess serving as a base and both sides of the receiving recess. The pair of support pieces have a pair of wedge guide holes facing each other in a direction crossing the receiving recess, and correspond to a plurality of different diameter reinforcing bars placed on the base. The wedge member has a plurality of pairs of wedge guide holes each having a different height, and the wedge member has a plurality of reinforcing bar pressing portions along the insertion direction.

The wedge member has a plurality of reinforcing bar pressing portions to be pressed against the reinforcing bar along the insertion direction, so that the wedge member is fixed at at least two points along the longitudinal direction of the reinforcing bar, the reinforcing posture of the reinforcing bar is stable, and the reinforcing bar fixing force is high. .
Therefore, the wedge member is not limited in shape as long as two or more reinforcing bar pressing portions are provided. For example, a substantially U-shaped section, a substantially M-shaped cross section, or a substantially H-shaped cross section in which a pair of reinforcing bar pressing portions are provided. However, from the viewpoint of easy production by press molding, the U-shape and the M-shape are easier, and the M-shape is easier to secure the strength than the U-shape.
As the reinforcing bars, deformed reinforcing bars with convex portions formed on the surface at a predetermined pitch are generally used, so the reinforcing bar pressing part presses the reinforcing bars at different positions in the length direction, so that the reinforcing bar axial direction Therefore, the repressing portion of the reinforcing bar tends to be engaged with the convex portion with respect to the external force, and the pinching and fixing property is improved.
Since the metal fitting body has a plurality of pairs of wedge guide holes corresponding to a plurality of types of reinforcing bars having different diameters, the reinforcing bars can be fixed only by selecting a wedge guide hole into which one wedge member is inserted.
It is also possible to select the thickness of the deformed reinforcing bar by inserting the wedge member upside down into one wedge guide hole. In such a case, the wedge guide hole has an insertion height of the wedge member. The wedge member has a height-adjusting convex portion for adjusting the height, and the wedge member has a substantially U-shaped cross section or a substantially M-shaped cross section, and includes two tapered pieces on both sides of the U-shaped or M-shaped cross section. It is good to have a plurality of reinforcing bar pressing parts along the insertion direction in the back part which connected the reinforcing bar pressing part of the place and the taper piece part of the both sides concerned.
Here, the purpose of providing the height adjustment convex portion in the wedge guide hole is that when the wedge member is inserted so that the back surface portion of the wedge member is in contact with the height adjustment convex portion, the wedge member is turned upside down to increase the height. The purpose is to selectively use the case where the taper piece portions on both sides of the wedge member are inserted into the concave portions formed on both sides of the height adjusting convex portion.

According to a third aspect of the present invention, there is provided a concrete form root anchor, wherein the receiving recess is formed in a substantially V-shape.
The receiving surface for receiving the reinforcing bar is formed in a substantially V shape in which a substantially linear inclined surface is connected symmetrically, so that the reinforcing bar pressed by the wedge member is guided toward the deepest part of the substantially V shape. As a result, rebars with a small diameter can be stably fixed.

  According to a fourth aspect of the present invention, there is provided a concrete form rooting metal fitting in which a part of a support piece is cut out and a welding piece is formed by bending.

In this way, when a piece of welding formed by bending a notch or notch in the support piece of the metal fitting body is provided, this piece of welding separated from the base of the metal fitting main body with which the reinforcing bar directly contacts. Other metal members can be connected by welding at the portion.
Therefore, it is possible to prevent the reinforcing bars from being rounded by heat generated during welding.
The welding of the metal member to the welding piece may be performed with the metal member facing in a desired direction in a state where the metal fitting body is sandwiched and fixed by the reinforcing bar.
The welding piece part may be provided only on one support piece part or on both support piece parts, and if provided on both support piece parts, the mounting direction of the metal member can be freely selected over almost the entire circumference. It becomes possible.
Also, here, the welding piece part is bent from the support piece part so as to be easily welded, and the purpose is to weld other metal members mainly by the weld piece part. It is also possible to weld, and it is easier to secure the welding strength.
Moreover, a clearance gap may be formed between a reinforcing bar and a welding part by forming the embossing convex part for welding in the back surface of the receiving recessed part of a metal fitting main body, and it may be made not to have the influence of welding heat on a reinforcing bar.

In the concrete form fixing root metal fitting according to the present invention, since the wedge member is provided with a plurality of reinforcing bar pressing portions, the reinforcing bars are clamped and fixed at at least two places in the longitudinal direction, so that the reinforcing strength of the reinforcing bars is high.
In particular, when used for deformed reinforcing bars having convex portions formed at a predetermined pitch, the reinforcing bar pressing portions are likely to be engaged with the convex portions, so that the pinching and fixing strength against external force in the reinforcing bar axial direction is high.
In addition, since one metal fitting body has a plurality of wedge guide holes having different heights from the base, one metal fitting comprising a combination of one wedge member and one metal fitting main body can be used for a plurality of reinforcing bars having different diameters. Can be fixed.
Further, when the wedge member has a substantially U-shaped cross section or a substantially M-shaped cross section, and a height adjustment convex portion is formed in the wedge guide hole, the wedge member insertion method is connected to the taper pieces on both sides. By switching between the case where the position is the upper surface and the lower surface, it is possible to fix at least two types of reinforcing bars having different diameters without increasing the overall length of the wedge member.

In the concrete form fixing bracket according to claim 3, even a reinforcing bar having a diameter smaller than the opening width of the metal fitting can be stably positioned and fixed because it is dropped so as to be guided to the deepest part of the substantially V shape. .
Therefore, it is possible to prevent the reinforcing bars from being displaced particularly when the diameter of the reinforcing bars is small as in the prior art, and it is possible to reliably attach reinforcing bars having different diameters.
As described above, it is possible to cope with a plurality of reinforcing bars having different diameters with a single type of root metal fitting, and it is possible to reduce the cost from the manufacture of the root metal fitting to storage management, transportation, and on-site use.

In the concrete form fixer according to the fourth aspect of the present invention, since the welding piece is provided on the support piece, any metal member such as a separator can be selectively attached.
And since the attachment direction of a metal member can be freely set within the range which can be welded, it is easy to match on-site.
Since the welding piece can be provided by cutting or notching when molding the metal fitting body, there is almost no need for a new design or manufacturing process as a dedicated fixing part for metal members such as separators. And can be manufactured at a low cost while having a simple structure without increasing the size of the metal fitting body and increasing the number of parts.
Since various metal parts or component mounting nut members can be welded and fixed to the metal fitting body as long as they can be welded mainly using a piece for welding, the base metal fitting of the present invention has a separator Of course, it is possible to cope with the attachment of various parts required for assembling the concrete formwork.
Moreover, if the embossing convex part for welding is formed in the back surface of the receiving recessed part of a metal fitting main body, even if it is near a reinforcing bar, welding stop with high intensity | strength is attained, suppressing the influence of the welding heat given to a reinforcing bar.

FIG. 1 is an explanatory view of a concrete form fixing bracket 10 according to the present invention, and FIG. 1A is a perspective view of the fixing bracket 10.
The root metal fitting 10 includes a metal fitting body 20 and a wedge member 30.
The metal fitting body 20 has an integral structure in which a metal plate material is bent and folded, and a receiving recess 21 having a substantially V-shaped cross section and a pair of support pieces 24 extending so as to be opposed to each other in parallel from both sides of the receiving recess 21. have.
A receiving surface 23 having a groove shape with a substantially V-shaped cross section is provided inside the receiving recess 21.
As will be described later, the reinforcing surface is placed on the receiving surface 23 so that the longitudinal direction of the reinforcing bar to be fixed is aligned with the longitudinal direction of the groove, and the wedge member 30 is driven and fixed.
The respective support piece portions 24 are opposed to each other in a direction crossing the receiving recessed portion 21, so that a first wedge guide hole 25 a, a second wedge guide hole 25 b, a third wedge guide hole 25 c, a fourth wedge guide hole 25 d, and a weld A piece 26 is provided.
The first wedge guide hole 25a, the second wedge guide hole 25b, the third wedge guide hole 25c, and the fourth wedge guide hole 25d are paired with those provided to face both the support piece portions 24, respectively. It arrange | positions at intervals in the longitudinal direction of the reinforcing bar in the state mounted in the receiving surface 23.
The embodiment shown in FIG. 1 shows an example of a metal fitting that can accommodate four types of reinforcing bars having different diameters, and the number of wedge guide holes is not limited to four.
The welding piece 26 is formed by bending outward a metal piece obtained by cutting out the upper part of the support piece 24.
The wedge member 30 is formed in a substantially U-shaped cross section with a downward opening in which a pair of reinforcing bar pressing portions 32 are suspended from both sides of the wedge base portion 31 in parallel.
The lower edge of the reinforcing bar pressing part 32 is a tapered piece 33 that is inclined so as to increase the width in the height direction of the reinforcing bar pressing part 32 from the front end 30a to the rear end 30b of the wedge member 30 in the longitudinal direction.
FIG. 2A shows a state in which the metal fitting body 20 and the wedge member 30 are viewed in the direction in which the support pieces 24 overlap each other.
The first wedge guide hole 25a, the second wedge guide hole 25b, the third wedge guide hole 25c, and the fourth wedge guide hole 25d correspond to the outer shape of the wedge member 30 so that the wedge member 30 is guided through the tip 30a. Both supporting piece portions 24 are communicated with each other in a rectangular shape.
FIG.1 (b) shows the state which looked at the metal fitting main body 20 from the welding piece part 26 side in the length direction of the reinforcing bar of attachment object.
The receiving recess 21 has a substantially V-shaped cross-section that swells on the opposite side of the support piece 24, and is provided with an outwardly angled bent portion 22 at the center, with the innermost being the deepest between the opposing substantially linear inclined surfaces 23b. A receiving surface 23 having a substantially V-shaped cross section having a portion 23a is formed.
The receiving surface 23 may have a curved surface necessary for bending a metal plate material into a V-shaped cross section.
FIG. 1 (c) shows a state in which the root metal fitting 10 is clamped and attached to the deformed reinforcing bar 1a.
A deformed reinforcing bar (hereinafter referred to as a reinforcing bar) 1a has convex portions 1e formed at a predetermined pitch in the surface length direction.
First, the root metal fitting 10 is attached to the reinforcing bar 1a by aligning the length direction of the reinforcing bar 1a with the groove-like length direction of the receiving surface 23 to receive the reinforcing bar 1a from between the support piece portions 24. Is inserted and placed on the receiving surface 23 of the.
Then, the wedge member 30 is crossed across the receiving recess 21 from one support piece portion 24 side to the other support piece portion 24 side in the wedge guide hole 25a provided corresponding to the diameter of the reinforcing bar 1a. Inserting from the front end 30a and driving the rear end 30b, the reinforcing bar 1a is sandwiched and fixed between the taper piece 33 and the receiving surface 23 of the wedge member 30 by a wedge action.
FIG.1 (d) shows the perspective view of the state which attached the root metal fitting 10 to the reinforcing bar 1a.
The wedge member 30 presses the reinforcing bar 1a by the taper piece 33 of each of the pair of reinforcing bar pressing portions 32 protruding to the reinforcing bar side to be fixed along the insertion direction. Clamp and fix.
The angle θ of the taper piece portion 33 with respect to the wedge base portion 31 is preferably set in the range of about 3 to 7 °, and preferably in the range of 5 to 6 °.
This is because when the angle θ is increased, the wedge is easily loosened, and when the angle θ is small, the entire length of the wedge member is increased.
The wedge member 30 presses a position separated in the length direction of the reinforcing bar 1a by the pair of reinforcing bar holding portions 32, so that the reinforcing bar 1a is stably clamped while receiving external force in the reinforcing bar length direction. The reinforcing bar pressing portion 32 is easily engaged with the convex portions 1d provided at a predetermined pitch, and the clamping and fixing strength against the external force in the reinforcing bar length direction is high.
Since both the support piece portions 24 have the same shape and are opposed to each other, the wedge member 30 may be inserted and driven in from either support piece portion 24 side.
A structure for fixing the root metal fitting to various types of reinforcing bars having different diameters will be described later.

FIG.1 (e) shows the state which attached the separator 2 to the welding piece part 26 of the root metal fitting 10 attached to the reinforcing bar 1a by welding.
The welding piece 26 is not limited to the separator 2, and various metal members required for assembling the concrete form may be attached by welding.
The purpose of the welding piece 26 is to facilitate welding and to prevent the heat during welding from being transmitted to the reinforcing bars to reduce the strength of the reinforcing bars. The receiving piece 21 is a support piece that is the base on which the reinforcing bars are placed. 24 is provided on the upper side of the support piece 24 on the opposite side.
As shown in FIGS. 5 (a), 5 (b), and 5 (c), for example, as shown in FIGS. What is necessary is just to weld an edge part etc. Moreover, it may weld only to the piece 26 for welding provided in the one support piece part 24, or may be welded so that it may straddle both the pieces 26 for welding.
And when attaching a metal member only to one support piece part, the support piece part on the side which does not attach a metal member is used as the support piece part 24a which does not provide the welding piece part as shown in FIG.5 (c). Also good.
Also, the weld piece 26 is mainly used. For example, as shown in FIG. 5A, the notch end 24e of the support piece 24 or the upper portion of the support piece 24 as shown in FIG. 4A. It is easy to obtain the strength by welding together with the weld piece part to 24u.
At the end of the separator 2 on the side where the bolt 2a is provided, for example, a cone (not shown) is screwed into the bolt 2a, and this bolt 2a is passed through a through-hole of a concrete formwork (not shown). After adjusting to a predetermined formwork position, a fastening fitting (not shown) is screwed and fixed to the bolt 2a from the outside of the through hole, and the reinforcing bar and the formwork are fixed via the root fitting.
The arrangement of the wedge guide holes in the metal fitting body is not limited. For example, as in the metal fitting body 20a shown in FIG. 6A, the first wedge guide hole 25a, the second wedge guide hole 25b, the third wedge guide hole 25c, and the fourth wedge guide hole. The wedge guide hole 25d may be arranged so that the distance from each receiving recess 21 is gradually changed along the length direction of the reinforcing bar.
FIG. 6B shows a state in which the reinforcing bar 1a inserted and mounted on the metal fitting body 20a is sandwiched and fixed by the wedge member 30, and the separator 2 is welded and attached to the metal fitting body 20a.
Further, as long as the wedge member has a plurality of reinforcing bar pressing portions 32 along the insertion direction, the wedge base is not limited to a substantially U-shaped cross-section obtained by bending a metal plate material. For example, a wedge base 30c shown in FIG. The portion 31 may be provided with a trough-shaped bent portion 31a in the length direction to increase the strength as a substantially M-shaped cross section, or may be formed into a substantially H-shaped cross section.

2 (b), (c), (d), and (e) are subjected to reinforcing bars 1a, 1b, 1c, and 1d having diameters different from φa, φb, φc, and φd (φa>φb>φc> φd), respectively. The explanatory view which looked at the state mounted on receiving surface 23 of crevice 21 in the direction where support piece parts 24 overlap is shown.
The reinforcing bars 1a, 1b, 1c, and 1d have different nominal diameters, for example, 22 mm, 19 mm, 16 mm, and 13 mm, respectively.
The height ha ₁ of the receiving surface 23 from the deepest portion 23a of the rectangular upper edge 25g of the first wedge guide hole 25a is set when the wedge member 30 is inserted and driven in a state where the reinforcing bar 1a is placed in the recess 21. The wedge base portion 31 is guided to the height of the taper piece portion 33 of the wedge member 30 so as to press against the side surface of the reinforcing bar 1a.
Then, it is set to a height that does not interfere with the wedge member 30 height ha ₂ from the receiving surface deepest portion 23a of the lower edge 25h rectangular first wedge guide hole 25a is implanted by inserting.
Similarly, the second wedge guide hole 25b has a rectangular upper edge height corresponding to the reinforcing bar 1b as hb ₁ , the rectangular lower edge height as hb _2, and the third wedge guide hole 25c corresponds to the reinforcing bar 1c. Correspondingly, the rectangular upper edge height is hc ₁ , the rectangular lower edge height is hc _2, and the fourth wedge guide hole 25d has a rectangular upper edge height hd ₁ corresponding to the reinforcing bar 1d. As described above, the height of the lower edge of the rectangular shape is set to hd ₂ so that the corresponding reinforcing bars can be clamped and fixed by inserting and driving the wedge members 30 respectively.

3 (a), 3 (b), 3 (c), and 3 (d) are explanatory views of a state in which the reinforcing bars 1a, 1b, 1c, and 1d having different diameters are placed in the recesses 21 as viewed in the reinforcing bar length direction. Indicates.
In order to make it easy to understand, the reinforcing bar has a cross section of the maximum outer diameter portion of the convex portion provided on the surface.
Since the receiving surface 23 inside the receiving recess 21 is formed in a substantially V shape, when the wedge member 30 is inserted into the wedge guide hole and driven, the taper piece portion 33 of the wedge member 30 receives the respective reinforcing bars. The receiving surface 23 guides the reinforcing bar in the direction of the deepest portion 23a having a substantially V shape.
The opening angle of the substantially V-shape of the receiving surface 23 is not limited as long as it can receive the side surface of the reinforcing bar pressed by the wedge member and guide it in the direction of the deepest portion 23a until the reinforcing bar is clamped and fixed. The inner angle between the substantially linear inclined surfaces 23b on both sides of the deepest portion 23a may be about 120 °.
The interval between the support piece portions 24 is set to the maximum outer diameter including the convex portion of the reinforcing bar of the type having the largest diameter for the convenience of dealing with other types of reinforcing bars having different diameters.
Since the receiving surface 23 guides the reinforcing bar with a substantially linear inclined surface 23b in a substantially V shape, the guiding direction of the reinforcing bar is a substantially straight line that does not depend on the diameter of the reinforcing bar from the reinforcing bar 1a having a large diameter to the reinforcing bar 1d having a small diameter. The direction is along the inclined surface 23b.
Therefore, the difference in the ease of displacement of the reinforcing bar due to the insertion and driving of the wedge member due to the difference in the diameter of the reinforcing bar is reduced to prevent the position of the reinforcing bar having a particularly small diameter as in the prior art.
The reinforcing bar pressed toward the deepest portion 23a of the receiving surface 23 by the taper piece 33 is positioned in a state of being received in the substantially V shape of the receiving surface, and is sandwiched between the taper piece 33 and the receiving surface 23. It becomes a fixed state.
Since the receiving surface 23 is symmetrically formed with the deepest portion 23a at the center interposed therebetween, even if the wedge member 30 is inserted and driven from either side of the support piece portion 24, the reinforcing bars can be similarly held and fixed.
4 (a), 4 (b), and 4 (c) are perspective views showing a state in which the reinforcing bars 1b, 1c, and 1d having different diameters are clamped and fixed by the root metal fitting 10, respectively.

FIG. 8 is an explanatory view of an embodiment of another root brace 10a in which reinforcing bars having different diameters are handled by a pair of wedge guide holes.
Fig.8 (a) shows the perspective view of the root metal fitting 10a.
The metal fitting body 20b is provided with two pairs of wedge guide holes 25e and 25f.
8 (b) and 8 (c) show a state where the reinforcing bars 1c and 1d are inserted and mounted in the metal fitting body 20b, and the wedge member 30 is inserted and driven into the wedge guide hole 25f.
The root metal fitting 10a can sandwich and fix reinforcing bars having different diameters by pressing at different positions from the front end side to the rear end side of the tapered portion 33 of the wedge member 30 inserted and driven into the wedge guide hole 25e.
FIGS. 9A, 9B, 9C, and 9D show a state in which reinforcing bars having different diameters are clamped and fixed by the root fitting 10a.

In FIG. 10, a back surface concave portion 34 in the wedge member insertion direction is formed by pressing or the like on a base portion (back surface portion) 31 connecting the taper piece portions 33 on both sides of a wedge member 32 having a substantially U-shaped cross section. An example in which two reinforcing bar pressing portions 32a and 32a are formed in the portion along the insertion direction is shown.
The guide holes 25a and 25b corresponding to the wedge members are provided with height adjustment convex portions 27a and 27b for adjusting the reinforcing bar fixing height, respectively.
Concave portions 28a and 28b are formed on both sides of the height adjusting convex portions 27a and 27b.
A front view of this type of wedge member in the reinforcing bar insertion direction is shown in FIG. 11A, a side view thereof is shown in FIG. 11B, and a bottom view thereof is shown in FIG.
FIG. 12 shows an example in which a reinforcing bar is fixed using this type of root bracket.
For example, in FIG. 12A, the wedge member 30 is driven so that the back surface portion 31 of the wedge member 30 is brought into contact with the height adjusting convex portion 27b of the wedge guide hole 25b. , The back portion 31 of the wedge member 30 is turned upside down using the same wedge guide hole 25b, and the taper piece portions 33 of the tapered reinforcing bar pressing portion are provided on both sides of the height adjustment convex portion. FIG. 12B shows an example in which the reinforcing bar 1c having a nominal diameter of 16 mm and the metal fitting main body are fixed by being driven so as to be squeezed into the recesses 28a and 28b serving as parts.
As a result, the same wedge guide hole can be used to connect the reed bars having different diameters without increasing the overall length of the wedge member 30 as shown in FIGS.
In the present embodiment, the wedge guide hole 25a is used to deal with reinforcing bars having nominal diameters of 21 mm and 19 mm, but it goes without saying that it can also deal with reinforcing bars having larger diameters.
Further, by adjusting the depths of the recesses 28a and 28b serving as relief portions, combinations of diameters different from those of the present embodiment are possible.
The embodiment shown in FIGS. 10 to 12 shows an example in which a locking projection 23c is formed on the receiving surface 23 of the metal fitting body 20 by press working or the like.
The locking projection 23c has a V-shaped cross section with the inner side protruding in a direction perpendicular to the reinforcing bars placed on the inclined surfaces 23b on both sides of the receiving recess 23 formed in a substantially V shape.
Further, the top surface and the top surface of the locking projection 23c provided on both sides of the inclined surface 23b are V-shaped toward the deepest portion 23a.
Thereby, the longitudinal slip of the reinforcing bar is prevented.
In this embodiment, as shown in FIG. 11, an example in which a pair of left and right engaging projections 23 c are provided in three places on the metal fitting body 20 is not limited. In addition, the embossing improves the strength of the bracket body.

In FIG. 13, a gap is formed between the reinforcing bar and the welded portion by forming the embossing convex portion for welding on the back surface (outside) of the receiving concave portion 21 of the metal fitting main body 20 so that the influence of the welding heat is not exerted on the reinforcing bar. The example which welds the separator 2 using the metal fitting main body 20 of the type which was made is shown.
The embossing convex portions 29a, 29b, 29c, and 29d for welding are formed by pressing or the like as shown in FIG. 11, and in this embodiment, a cross-shaped concave portion formed between the four embossed convex portions is used. It can be welded in parallel or perpendicular to the reinforcing bars.
Thus, when a convex part is formed in the receiving concave part 21 by embossing, a space is formed on the inside and outside of the embossing, and the separator 2 is arranged between the convex part and the convex part and can be welded so as to float from the base part. It effectively prevents the reinforcing bars from being annealed.

The explanatory view of the root metal fitting for concrete formwork concerning the present invention is shown. (A) shows a state in which the metal fitting main body and the wedge member are viewed in the direction in which the supporting pieces overlap each other, and (b), (c), (d), and (e) receive reinforcing bars having different diameters and place them in the recesses. The state which it put and it looked in the direction where support piece parts overlap is shown. Explanatory drawing which looked at the state which received the reinforcing bar from which a diameter differs, and was mounted in the recessed part in the reinforcing bar length direction is shown. The perspective view of the state which pinched and fixed the reinforcing bar from which a diameter differs with a root metal fitting is shown. The state in which the direction of attachment of the separator to the weld piece is varied is shown. An example of a root fitting having a different wedge guide hole arrangement will be described. A wedge member having a substantially M-shaped cross section is shown. Explanatory drawing of the root metal fitting which respond | corresponds the reinforcing bar from which a diameter differs by a pair of wedge guide holes is shown. The perspective view of the state which pinched and fixed the reinforcing bar from which a diameter differs with a root metal fitting is shown. An example in which a wedge member is inserted upside down into one wedge guide hole is shown. The example which formed the height adjustment convex part in the wedge guide hole is shown. The example which fixes a reinforcing bar and a metal fitting main body with a wedge member is shown. The example which formed the embossing convex part for welding in the receiving recessed part back surface of a metal fittings main body is shown. A conventional root bracket is shown.

Explanation of symbols

1a, 1b, 1c, 1d Reinforcing bars 1e Convex part 2 Separator (other metal member)
2a Bolts 10 and 10a Concrete form fixing metal fittings 20, 20a and 20b Metal fitting body 21 Receiving recess 22 Bending portion 23 Receiving surface 23a Deepest portion 24 and 24a Support piece 25a First wedge guide hole 25b Second wedge guide hole 25c Third wedge guide hole 25d Fourth wedge guide hole 25e, 25f Wedge guide hole 25g Upper edge 25h of wedge guide hole Lower edge 26 of wedge guide hole Welding pieces 29a, 29b, 29c, 29d Embossed convex part 30 for welding 30c Wedge member 30a Wedge member front end 30b Wedge member rear end 31 Wedge base portion (back surface portion)
31a Valley-shaped bent part 32 Reinforcing bar pressing part 32a Reinforcing bar pressing part 33 on the back side Tapered piece part

Claims (5)

A metal fitting body and a wedge member for fixing a reinforcing bar placed on the base of the metal fitting body;
The metal fitting body has a receiving recess that is a base, and a pair of support pieces that are erected from both sides of the receiving recess,
The pair of support pieces have a pair of wedge guide holes facing in a direction crossing the receiving recess, and a plurality of pairs of wedge guide holes having different heights corresponding to the plurality of different diameter reinforcing bars placed on the base. Have
The wedge member has a plurality of reinforcing bar pressing portions in the insertion direction, and a concrete mold root anchor. The wedge guide hole has a height adjustment convex portion for adjusting the insertion height of the wedge member,
2. The concrete according to claim 1, wherein the wedge member has a substantially U-shaped cross section or a substantially M-shaped cross section, and has a plurality of reinforcing bar pressing portions on the back surface along the insertion direction. Fixing bracket for formwork.   3. The concrete mold root fixing bracket according to claim 1, wherein the receiving recess is substantially V-shaped.   4. A concrete mold root anchor according to claim 1, wherein a part of the support piece is cut out and a welding piece is formed by bending.   The metal fitting root fixing metal fitting according to any one of claims 1 to 3, wherein the metal fitting main body has an embossing convex portion for welding formed on the back surface of the receiving concave portion.

Images