JP2710745B2 - Jig for fastening steel formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening jig used for fastening a steel formwork used when manufacturing a concrete product.

[0002]

2. Description of the Related Art A fastening jig used for fastening a steel formwork used when manufacturing a concrete product is composed of a clamp, a receiving fitting, and a hook fitting. Among them, the clamp and the receiving metal have conventionally been manufactured by bending a steel plate or the like, press-drilling, welding or the like.

[0003]

As described above, the conventional clamp is formed by bending a normal steel plate or the like, forming a press hole,
Manufactured by welding or the like, the number of steps is increased and the cost is increased. Further, when a high-strength steel sheet is used, the quality as a material is deteriorated due to welding heat, so that a high-strength steel sheet cannot be used. Therefore, when a high-strength clamp is to be manufactured by a conventional method, the size of the main body is increased in terms of both the working surface and the material, resulting in poor operability.

[0004] Since the clamp and receiving member of the present invention are manufactured by forging, they are made of a material having high mechanical properties.
It can be lightweight, has good operability, and offers low cost.

[0005]

SUMMARY OF THE INVENTION A U-shaped bracket is provided at the upper end of both ends of a U-shaped bracket. A U-shaped lever is arranged so as to cross-fit into the U-shaped bracket, and a pin provided at the U-shaped tip of the lever is inserted into a U-groove of the U-shaped bracket. Then, the lever is pivotally attached to the bracket by caulking the upper portion of the U groove. The base of the U-shaped lever forms a round bar, and an inverted U groove for inserting a pin of a clamper is provided on both sides close to the base of the U-shape. The pin of the clamper is inserted, and the lower part of the U-groove is inserted. The swage clamper is pivoted to the lever. The clamper is provided with a hole having a hole for bolt penetration between the pins pivotally connected to the U-shaped lever, and
The bottom forms a stopper so that the round bar of the lever is slightly lower than horizontal. A commercially available bolt is passed through the clamper, and a commercially available long nut is screwed with the clamper sandwiched between the bolts to form a clamp.

The receiving fitting has a U-shape and is provided with lateral U-grooves on both sides to receive the hooking fitting. The hook is formed by welding a round bar having an external thread and another round bar into a T-shape.

[0007] Both the clamp and the receiving bracket are forged of high-strength steel.

[0008]

1 shows a clamp 1 according to the present invention. This will be described below with reference to the drawings. A U-shaped groove 3 is provided on both ends of a U-shaped bracket 2. A U-shaped lever 4 is arranged so as to cross-fit with the U-shaped bracket 2,
The pin 5 provided at the U-shaped tip of the lever is inserted into the U-shaped groove 3 of the U-shaped bracket 2, and the lever 4 is pivotally attached to the bracket 2 by caulking the upper part of the U-shaped groove. In the figure, pin 5 is
The state where the groove 3 is held and the U groove 3 is crimped is shown. U
The base of the L-shaped lever 4 forms a round bar 6, and an inverted U groove 9 for inserting the pin 8 of the clamper 7 on both sides near the U-shaped base.
The pin 8 of the clamper 7 is inserted, the lower part of the U groove 9 is swaged, and the clamper 7 is pivotally attached to the lever 4. The figure shows a state where the pin 8 is held by the U groove 9 and the U groove 9 is crimped. The clamper 7 is provided with a hole having a hole for penetrating the bolt 10 between the pins 8 pivotally connected to the U-shaped lever 4, and the bottom of the clamper 7 is stopped when the round bar 6 of the lever 4 is slightly lower than horizontal. The stopper 11 is formed. The bolt 10 is a commercially available bolt, which is inserted into the clamper 7 and screwed with a commercially available long nut 12. The bracket 2, the lever 4, and the clamper 7 constituting the clamp 1 are all made of high-strength steel forging.

FIG. 2 shows an example of the receiving bracket 13. When manufacturing concrete products, the steel molds 22 and 23 are fastened by welding the clamp 1 and the receiving bracket 13 to the steel molds 22 and 23 to be fastened, respectively, and the lever 4 of the clamp 1 is set up. In this state, the T-shaped hook 14 is screwed into the long nut of the clamper 7, and the T-shaped hook 14 is hooked in the lateral U-groove 15 of the receiving bracket 13.
While rotating the lever 4 about the pin 5 of the lever 4, the lever 4 is tilted horizontally to obtain a horizontal stroke and the steel molds 22 and 23 are fixed to each other. Clamp 1 and bracket 1
FIG. 6 shows an embodiment in which the steel molds 22 and 23 are fixed using the hook 3 and the hook 14.

In FIG. 6, the position of the stopper 11 is such that the pin 8 is located lower than the pin 5 by δ in order to prevent the clamp 1 from loosening naturally. Therefore, the tension of the hook 14 pulling the molds 22 and 23 is reduced by an amount corresponding to δ. In order to eliminate this problem, a disc spring 20 is inserted between the bolt 10 and the clamper 7 as shown in FIG. 7, and when a maximum tensile force is applied, the tension corresponding to the compression force of the disc spring is absorbed, and The effect of compensating the tensile force can be given to the corresponding loosening of the clamper. By selecting the number and size of the disc springs, the maximum tension when the clamper 7 is tilted horizontally can be absorbed. It is also possible.

FIG. 2 shows another example of the clamp, in which the round bar 6 at the base of the U-shaped lever 4 is shortened, the pin 8 of the clamper 7 is protruded long, and a U-groove 16 is fitted into the pin 8. A hole 1 for forming a U-shaped auxiliary arm 17 and inserting the round bar 6 at the base of the U-shaped lever 4 into the base of the U-shaped auxiliary arm 17
The clamp 8 itself is further reduced in weight and size by obtaining a horizontal stroke of the clamper 2 by using the auxiliary arm 17 to which the lever handle 19 is welded along the hole 18 by drilling the hole 8.

FIG. 4 shows another example of the receiving bracket 13 and FIG. 5 shows the hook 14.

[0013]

The effects of the present invention are as follows. (A) Since all the clamps and receiving members are manufactured by forging, a material having high mechanical properties can be easily used, and the size and size of the device can be reduced.
The weight can be reduced.

(B) The joints between the members can be pivotally connected only by pressing and swaging a forged product without using machining, thereby reducing the cost.

[Brief description of the drawings]

FIG. 1 (a) is a side view of the clamp of the present invention. (B) It is a top view of FIG.1 (a). (C) It is a front view of FIG.1 (a).

FIG. 2A is a side view showing another example of the clamp of the present invention. FIG. 2B is a top view of FIG. (C) It is a side view of an auxiliary arm.

FIG. 3A is a side view of a receiving fitting. FIG. 3B is a top view of FIG. FIG. 3C is a front view of FIG.

FIG. 4A is a side view of another example of the receiving fitting. FIG. 4B is a top view of FIG. (C) It is a front view of FIG. 4 (a).

FIG. 5A is a top view of a hook. FIG. 5B is a side view of FIG.

FIG. 6 (a) is a view showing an application example of a jig for fastening a steel formwork of the present invention. FIG. 7B is a top view of FIG.

FIG. 7 is a diagram showing an example of a clamper to which a disc spring and a lock nut are applied in order to prevent loosening due to impact, vibration, or the like.

[Explanation of symbols]

1 ... clamp, 2 ... U-shaped bracket, 3 ...
・ U-shaped bracket U groove, 4 lever, 5 ...
Lever pin, 6 ... Lever round bar, 7 ... Clamper, 8 ... Clamper pin, 9 ... Lever reverse U groove, 10 ... Bolt, 11 ... Clamper stopper , 12 ... long nut, 13 ... receiving bracket, 14
... Hook, 15 ... U-groove of receiving bracket, 16
... U-shaped auxiliary arm U-groove, 17 ... U-shaped auxiliary arm, 18 ... U-shaped auxiliary arm hole, 19 ...
Lever handle of U-shaped auxiliary arm, 20: disc spring, 21: lock nut, 22: steel mold, 2
3 ... steel formwork

Claims (5)

(57) [Claims] 1. A jig for fastening a steel formwork, wherein a lever 4 is provided.
The lever 4 is pivotally attached to the bracket 2 with a pin 5 provided on the bracket 4, and the clamper 7 is pivotally attached to the lever 4 with a pin 8.
In a state where the lever 1 of the clamper 7 is pivoted, the clamp 1 formed by screwing the hook 14 on the side opposite to the side on which the lever 4 of the clamper 7 is pivoted is connected to one side 22 of the steel form to be fastened and the other side. The hook 14 is hooked on the receiving metal 13 welded to the steel form 23, and the lever 4 is rotated around the pin 5 to be tilted down to produce a horizontal stroke. A jig for fastening steel formwork, characterized by fastening. 2. The jig for fastening a steel formwork according to claim 1, wherein the clamp 1 and the receiving bracket 13 are forged, and the pins 5 and 8 are also caulked instead of being machined. 3. A jig for fastening a steel formwork according to claim 1, wherein a hole is formed in the clamper 7, a bolt 10 is passed through the hole, and a long nut 12 is screwed into the hole. 4. A disc spring 20 is inserted into a bolt 10 insertion portion of the clamper 7, and the compression force of the disc spring is used to prevent loosening. The clamper 7 holds a compression allowance of the disc spring. 2. The jig for fastening a steel formwork according to claim 1, wherein the position is fixed by a double nut so as to maintain the distance between the nuts, and the clamper 7 is clamped. 5. A lever (8) is operated by an auxiliary arm (17) composed of a bracket and a pipe, wherein the pin (8) of the lever (4) is protruded, and the bracket (8) is engaged with the projection of the pin (8).
The jig for fastening the steel formwork described in the above.