JP2588930Y2 - Safety device for concrete 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 safety device for a formwork in which a side plate or a stopboard is opened in a concrete formwork hinged to a base plate.

[0002]

2. Description of the Related Art In general, a concrete formwork for forming a large L-shaped retaining wall or a U-shaped groove has a structure in which a side plate or a base plate is hinged to a base and opened and closed in a vertical direction. For example, in the case of a formwork in which the lower end of the side plate hinges to the base and opens and closes vertically, and the side plates on both sides open and close left and right, the concrete product molded by opening the side plate and the side plate when removing the mold From the mold. At the time of this release, in a large formwork, the hook of the crane is hooked on the hook mounting bracket attached to the upper part of the side plate to hold the side plate so that it does not fall, then the fastening device for the side plate and the end plate is released, The crane is moved to open the ground while hanging the side plate and drop it to the ground.

However, in this method, when the hook of the crane is not securely hung on the mounting bracket fixed to the upper portion of the side plate, or when the crane wire is not loosened and lifted, the side plate and the end plate are tightened. When the device was released, there was a risk that the side plate would fall off the hook of the crane and suddenly fall down.

[0004]

SUMMARY OF THE INVENTION The present invention eliminates the above-mentioned drawbacks, and the locking mechanism is not released unless the hook of the crane lifts the side plate and the end plate securely, thereby providing a safety device for a concrete formwork with improved safety. To provide.

[0005]

SUMMARY OF THE INVENTION In the present invention, a vertical shaft guide groove is formed on the outside of a side plate or end plate in a concrete formwork which is hinged on a base plate or a base plate to open and close vertically. A guide plate is mounted, a connecting shaft is mounted laterally through the shaft guide groove, a hook mounting bracket is provided on the connecting shaft, and both ends of the connecting shaft are engaged from above to form a stopper. The connecting plate having the groove is provided so as to protrude from the end plate or the side plate.

[0006]

[Function] When removing the concrete formwork of the present invention,
First, the fastening device connecting the side plate and the end plate is released.
Next, after hanging the hook of the crane on the hook mounting bracket,
When the crane is pulled up, the hook mounting bracket is connected to the connecting shaft, so that the hook mounting bracket is pulled upward, and both ends of the hook mounting bracket are disengaged from the engaging grooves of the connecting plate to release the lock. When the connecting shaft is pulled up to the upper part of the shaft guide groove of the guide plate, the side plate tends to be lifted upward because the guide plate and the side plate are integrally joined. As described above, the crane is moved forward while the side plate is lifted, and the crane is slowly tilted down while the side plate is hung. Therefore, unless the hook mounting bracket connected to the side plate is lifted by the hook of the crane, the connection between the side plate and the end plate is not released, so that the side plate can be prevented from coming off the hook and suddenly falling down.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. This concrete form molds an L-shaped retaining wall, and an inverted L-shaped inner frame 2
Is attached, and a side plate 3 is provided so as to surround the front surface. A lower portion of the side plate 3 is connected by a hinge 4 attached to the base 1 so as to open and close in a vertical direction. In addition, end plates 5, 5 are provided so as to surround both sides of the inner frame 2, and are connected by hinges 4 so as to be opened and closed right and left. Further, both ends of the side plate 3 and ends of the end plates 5, 5 are detachably connected by a tightening device 6.

A plurality of guide plates 7 project from the front surface of the side plate 3 at predetermined intervals. The guide plates 7 are formed with a shaft guide groove 8 having a vertically long slot shape. 9 is a connecting shaft, which is attached through the shaft guide grooves 8 of the respective guide plates 7.
Retaining washers 10, 10 are joined to both ends. A hook fitting 13 having a round hole 12 formed in a plate 11 is joined to the middle of the connecting shaft 9. The end faces of the end plates 5, 5 located at both ends of the connecting shaft 9 have U
A connection plate 15 having a U-shaped engagement groove 14 is formed so as to protrude forward, and both ends of the connection shaft 9 are engaged with the U-shaped engagement groove 14 from above. Reference numeral 16 denotes a lateral displacement prevention washer attached to the connection shaft 9 at both ends so as to sandwich the connection plate 15 at a distance from the retaining washer 10.

When removing the concrete form,
First, the fastening device 6 connecting the side plate 3 and the end plate 5 is released. Then, the hook 17 of the crane is hooked on the round hole 12 of the hook fitting 13 as shown in FIG. 5B from the state of FIG. Next, when the crane is pulled up, the hook mounting bracket 13 is connected to the connecting shaft 9, so that the hook mounting bracket 13 is pulled upward. As a result, the hook mounting bracket
Both ends of 13 are released from the U-shaped engaging groove 14 of the connecting plate 15 to be unlocked.

When the connecting shaft 9 is pulled up to the upper part of the elongated shaft guide groove 8 of the guide plate 7, since the guide plate 7 and the side plate 3 are integrally joined, the side plate 3 is also lifted upward. To try. Thus, the side plate 3
Is lifted, and the crane is moved forward, and as shown in FIG. Thereafter, the end plates 5, 5 are opened to the left and right, and the molded product is taken out.

Therefore, unless the hook mounting bracket 13 connected to the side plate 3 by the crane hook 17 is lifted, the side plate 3
Since the connection between the side plate 3 and the end plate 5 is not released, it is possible to prevent the side plate 3 from being securely disconnected by the hook 17 of the crane and then released from being disconnected from the hook 17 and suddenly falling down.

FIGS. 6 to 8 show another embodiment of the present invention. A plurality of guide plates 7 project from the front surface of the side plate 3 at predetermined intervals. As shown in FIG. 7, the guide plates 7 are formed with shaft guide grooves 8 having a vertically long slot shape. A connecting shaft 9 is attached to the guide plates 7 through the shaft guide grooves 8 of the guide plates 7, and retaining washers 10, 10 are joined to both ends. Rings are located at two places in the middle of the connecting shaft 9.
The hook mounting bracket 13 formed by 18 is joined. Reference numeral 20 designates a washer for preventing the fitting from being laterally displaced, which is joined to the connecting shaft 9 beside the hook fitting 13. The connecting plate 15 attached to the end faces of the end plates 5, 5 located at both ends of the connecting shaft 9 has a U-shaped engaging groove 14 as in the above-described embodiment.

When removing the concrete form,
First, the fastening device 6 connecting the side plate 3 and the end plate 5 is released. Next, as shown in FIG. 8B, the hook 17 of the crane is hooked on the hook fitting 13 formed by the ring 18 as shown in FIG. Next, when the crane is pulled up, the hook mounting bracket 13 is connected to the connecting shaft 9, so that the hook mounting bracket 13 is pulled upward, and both ends thereof come out of the U-shaped engaging groove 14 of the connecting plate 15. The lock is released. When the connecting shaft 9 is pulled up to the upper part of the elongated shaft guide groove 8 of the guide plate 7, the guide plate 7 and the side plate 3 are integrally joined, so that the side plate 3 also tends to be lifted upward. . In this way, the crane is moved forward while the side plate 3 is lifted, and as shown in FIG. 8C, the crane is slowly tilted down while the side plate 3 is hung.
After that, the molded products are taken out after the end plates 5, 5 are opened right and left.

In the above embodiment, the connecting shaft 9 is mounted on the front surface of the side plate 3, and the connecting plate 15 having the U-shaped engaging groove 14 is provided on the end plate 5 located at both ends. On the contrary, the connecting shaft 9 is attached to the end plate 5,
A connecting plate in which engagement grooves 14 are formed in the side plates 3 located at both ends.
A structure provided with 15 may be used.

[0015]

As described above, according to the concrete form safety device of the present invention, the connection between the side plate and the end plate is released unless the hook mounting bracket connected to the side plate or the end plate is lifted by the hook of the crane. Since it is not performed, the side plate can be prevented from coming off the hook and suddenly falling, thereby improving safety.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a safety device for a concrete formwork according to an embodiment of the present invention.

FIG. 2 is a front view of a concrete formwork to which the safety device shown in FIG. 1 is attached.

FIG. 3 is a plan view of the concrete formwork shown in FIG. 2;

FIG. 4 is a side view of the concrete formwork shown in FIG. 2;

FIG. 5 is an explanatory diagram sequentially showing the operation states of the safety devices circled in FIG. 4;

FIG. 6 is a front view of a concrete formwork to which a safety device according to another embodiment of the present invention is mounted.

FIG. 7 is a side view of the concrete formwork shown in FIG. 6;

FIG. 8 is an explanatory diagram sequentially showing the operation states of the safety devices circled in FIG. 7;

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Base 3 Side plate 4 Hinge 5 Wife plate 6 Tightening device 7 Guide plate 8 Shaft guide groove 9 Connection shaft 13 Hook mounting bracket 14 U-shaped engagement groove 15 Connection plate 17 Crane hook 18 Ring

Claims (1)

(57) [Scope of request for utility model registration] 1. A concrete formwork which hinges a side plate or a base plate to a base and opens and closes in a vertical direction, a guide plate having a vertical shaft guide groove formed on the outside of the side plate or the base plate is attached. Attaching the connecting shaft in the transverse direction through the groove, providing a hook mounting bracket on the connecting shaft, and forming a connecting plate in which both ends of the connecting shaft are engaged from above to form an engaging groove serving as a stopper, A safety device for a concrete formwork, wherein the safety device protrudes from a base plate or a side plate.