JP2548876Y2 - Concrete formwork clamp - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a fastener for fastening a concrete form using a wedge.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, this type of fastener is provided with a round bar 37 or a reinforcing piece (not shown) perpendicular to the strip near a front end plate 31 of a strip 33 parallel to each other. The two ends are welded to the strip 33 and the two strips 33 and the front end 3
1 to prevent deformation of the band plate 33 and the front end plate 31 which are generated when the wedge 21 is driven into the wedge hole to press the form 23 and the form holding members 22 and 24. Had become. (For example, Japanese Utility Model Publication No. 52-3073).

[0003]

The above-mentioned conventional method of reinforcing by welding a round bar or a reinforcing piece to two parallel strips constituting a fastening member requires a long time for the welding process. In addition, after welding, it requires a further processing step for corrosion protection,
There is a disadvantage that "cost" is high.

[0004] It is an object of the present invention to provide a fastener capable of reducing costs by eliminating the welding process and the anticorrosion treatment process.

[0005]

SUMMARY OF THE INVENTION A concrete form clamp of the present invention has a substantially trapezoidal front end plate having a female thread at the center, and parallel front ends extending at both ends of the front end plate. A pair of band plates, and a reinforcing rod that penetrates and connects the pair of band plates near the front end plate. The pair of band plates has one side of a wedge penetrating both band plates. It has a wedge hole on the rear end side that moves vertically to both band plate parts and in the direction of the front end plate part as it is inserted, and has a circular through hole through which a reinforcing rod penetrates near the front end plate part. The circular through-hole has a notch in the diameter direction, and the reinforcing rod has a head with one end larger in diameter than the circular through-hole, and the head passes through the circular through-hole and abuts against one of the band plate portions. When the reinforcing rod has a projection on the surface of the reinforcing rod, the projection is in contact with the inner surfaces of the pair of band plates facing each other and can be inserted into the notch. At a position where the protruding portion is located does not overlap the notch are crimped across the band plate portion between the protrusions and the other end of the reinforcing rod is positioned on the other of the strip portion.

[0006]

When assembling the reinforcing rods to the strips parallel to each other, the protrusions provided on the reinforcing rods are inserted so as to match the cutouts of the circular through holes of one of the strips, and the head is placed on the outer surface of the strip. After the abutment, the reinforcing bar is rotated around its center line to shift the protrusion from the position of the notch, whereby the interval between the two parallel strips is retained by the protrusion of the reinforcing bar, Further, the other end of the reinforcing rod is swaged to form a fastening member.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a view showing a longitudinal section of a concrete formwork fastener 10 of one embodiment of the present invention and its use state, and FIG. 2 is a view showing two notches 6 symmetrical in a diameter direction of a circular through hole 5. FIG. 3 is a view showing a shape of a reinforcing rod 7 before being assembled, and FIG. 4 is a view showing a longitudinal section of a concrete formwork fastener of the prior art and its use state.

[0008] Both ends of a front end plate 1 having a female screw portion 2 fixed at a protruding central portion extend in parallel with the center line of the female screw to form a strip plate 3 separated by an interval A. The band plate 3 is provided with a circular through hole 5 at a position near the front end plate 1 and at right angles to the band plate 3 and a wedge hole 4 at a position far from the band plate 3. As shown in FIG. 2, two notches 6 symmetrical in the diameter direction are provided. A similar notch 6 can also be provided in the circular through hole 5 of the other band plate 3.

The reinforcing rod 7 is a round rod having a thickness suitable for the circular through-hole 5 and a head 8 having a diameter larger than the inner diameter of the through-hole 5 is provided at one end. At the contact position, the other end 11 has an under-neck length L long enough to provide the caulking portion 12. Also, two projections 9 are provided that can slide through the circular through-hole 5 and the notch 6 in FIG. 2 from the position immediately below the head 8 with the thickness t of the strip 3 toward the other end 11. Further, two projections 9 are provided on the other end side with a projection separation distance A equal to the interval dimension A of the two strips 3 from the projection 9. The length of each projection 9 is determined so as to have a strength capable of maintaining the interval A between the two strips when the reinforcing bar 7 is caulked.

Next, a process of assembling the concrete form fitting of this embodiment will be described. First, the protrusion 9 is formed in the circular through hole 5 and the notch 6 provided in one of the band plates 3.
After the reinforcing bar 7 is inserted and the head 8 comes into contact with the outer surface of the band plate 3, the reinforcing bar 7 is rotated by a quarter around its axis, and the projection 9 and the band plate are rotated. 3 is brought into contact with the inner surface,
By forming a caulking portion 12 at the other end 11 of the reinforcing rod 7, a fastening member is completed.

[0011]

As described above, according to the present invention, a reinforcing rod having a projection is inserted into a circular through hole having a notch, and the head is brought into contact with the band plate, and then rotated by a quarter turn. Since the insides of the two strips were held by the projections, and a caulking portion was formed at the other end of the reinforcing rod to form the formwork fastener,
Since the process of welding conventional round bars or reinforcing pieces can be eliminated, the plating process for corrosion protection after welding can also be omitted, and it is possible to use plated steel plates for the material of the strip, This is effective for cost reduction and process shortening.

[Brief description of the drawings]

FIG. 1 is a view showing a longitudinal section of a concrete formwork fastener of one embodiment of the present invention and a use state thereof.

FIG. 2 is a view showing a shape of a circular through hole having a notch.

FIG. 3 is a plan view of the appearance of a reinforcing rod before assembly.

FIG. 4 is a diagram showing a vertical section of a concrete formwork fastener according to a conventional technique and a use state thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front end plate 2 Female thread part 3 Strip plate 4 Wedge hole 5 Circular through hole 6 Notch 7 Reinforcement rod 8 Head 9 Projection part 10 Concrete formwork fastening fitting 11 Other end 12 Caulking part 21 Wedge 22 Formwork holding member 23 Formwork 24 Formwork 25 Support 26 Formwork spacing rod 30 Concrete formwork clamp 31 Front end plate 32 Female thread 33 Strip 37 Round bar 38 Welded part A Separation dimension of protrusion / Spacing inside strip L Neck length t Thickness of strip

Claims (1)

(57) [Scope of request for utility model registration] 1. A <br/> front plate portion of substantially trapezoidal shape having a female thread portion in the central portion and, said front plate portion at both ends extending each other <br/> pair of belt portions parallel to the When the front plate the pair of belt portions
Has a reinforcing rods through-connection in the vicinity part, the pair of belt portions, one of the sides of the wedge through the Ryoobiban portion is vertically and the both belt portions according to the wedge is inserted has a wedge hole moving in the direction of the front plate portion on the rear end side, also circular through-holes, notches diametrically to further one circular through hole through which the reinforcing bars to pass through near the front plate portion The reinforcing rod has a head whose one end is larger in diameter than the circular through-hole.
Such, the head portion through said circular through hole of the band plate portion
When abutting on one side, each of the opposing inner portions of the pair of band portions
The supplementary portion that is in contact with the side surface and that can be inserted through the
The projection on the surface of the strong rod and located on the head side
At a position that does not overlap with the notch, the other end of the reinforcing rod
The band plate portion between the other band plate portion and the projection portion
A concrete formwork fastening fitting that is crimped across .