Fall prevention structure for corner drop hanging beam

Abstract

To provide a fall prevention structure for a stop-log hanging beam that can reliably prevent a stop-log hanging beam from falling with a simple configuration.SOLUTION: A fall prevention structure 10 for a stop-log hanging beam is a fall prevention structure for a stop-log hanging beam 20 in which a hanging hook 40 rotatably attached to a beam body 22 is hooked to a hanging fitting 14 provided on a stop log 12 to lift the stop log 12. The fall prevention structure is provided with leg parts 60 that extend and contract downward from the beam body 22 toward an upper surface of the stop log 12. The leg parts 60 are characterized in that they include a driving portion 70 that extends when the stop log 12 is lifted and comes into contact with the upper surface, and contracts when the stop log 12 is removed to release the hanging hook 40.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fall prevention structure for a corner stopper hanging beam used when installing or removing a corner stopper. [Background technology]

[0002] Dust removal devices are installed in waterways for industrial use or in waterways that take in cooling water for power plants, etc. These devices use mesh screens to remove debris from the waterway, and because they are installed in seawater or river channels, shellfish and seaweed adhere to the device, causing corrosion on the surface. Corrosion is particularly likely to occur in areas where the tide level changes. For this reason, maintenance and inspection work on the dust removal equipment is carried out periodically by installing stoppers (also called water stop gates or gates) to stop the water flow in the waterway upstream of the dust removal equipment. The waterway in which the dust removal equipment is installed is, for example, 4 to 5 meters wide and about 10 meters deep. The stoppers installed in such waterways are flat plates with a thickness that is small compared to the water stopping surface (the surface that blocks the flow path when the stopper is installed in the gate groove of the waterway), and are divided into multiple parts along the depth of the waterway to reduce the weight of each plate, making them easier to install and remove.

[0003] When installing a stopper in a waterway, a crane hook is attached to two hanging fittings on the end face of the stopper in the thickness direction, and then the stopper is lifted up. A dedicated lifting beam is used, and special hooks on the beam body allow for installation and removal without human intervention. This means that even if the stopper is dropped deep into the waterway, it can be easily installed and removed from the ground without the need for someone to enter the waterway to remove the hooks. When lifting a stopper with a lifting beam, if the stopper tilts and the wire rope becomes loose, there is a risk that the stopper will come off the lifting beam and fall. Therefore, the safety device disclosed in Patent Document 1 is configured so that when the corner stopper is properly seated, the thrust rod is activated and the hook is released. However, the device in Patent Document 1 requires a separate safety device to be installed in the corner stopper, making it unsuitable for existing corner stoppers. Furthermore, corner stoppers equipped with safety devices have a complex configuration and must be manufactured individually, resulting in high costs. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 8-53829 Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE INVENTION In view of the above problems of the prior art, the problem to be solved by the present invention is to provide a fall prevention structure for a corner drop hanging beam that can reliably prevent the corner drop with a simple configuration. [Means for solving the problem]

[0007] As a second means for solving the above problems, the present invention provides a fall prevention structure for a corner stopper lifting beam in which a lifting hook rotatably attached to a beam body is hooked onto a lifting fixture provided on the corner stopper to lift the corner stopper, a leg portion tilting downward from the beam body toward the upper surface of the chamfer; The object of the present invention is to provide a fall prevention structure for a corner stopper lifting beam, characterized in that the legs are equipped with a drive unit that opens the legs to contact the upper surface when the corner stopper is lifted, thereby fixing the hanging hook, and closes the legs to remove the hanging hook when the corner stopper is removed. According to the second means, the simple structure of the legs that open from the beam body prevents the corner chamfer from coming off the hanging hook when being lifted, and reliably prevents the corner chamfer from falling. [Effects of the Invention]

[0008] According to the present invention, the simple configuration of the legs that extend or tilt from the beam body prevents the corner chamfer from coming off the hanging hook when being lifted, and reliably prevents the corner chamfer from falling. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram illustrating the configuration of the fall prevention structure for the corner drop hanging beam of Example 1. [Figure 2] FIG. 10 is a schematic diagram of the fall prevention structure for the corner drop hanging beam of the second embodiment. [Figure 3] FIG. 10 is an explanatory diagram of the lifting of a corner stopper using the fall prevention structure of the corner stopper lifting beam of the present invention. [Figure 4] FIG. 10 is an explanatory diagram of the removal of a corner drop using the drop prevention structure for a corner drop hanging beam of the present invention. [Figure 5] FIG. 10 is an explanatory diagram of the fall prevention structure of the corner drop hanging beam of the present invention when the corner drop is tilted. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fall prevention structure for a corner drop hanging beam of the present invention will be described in detail below with reference to the drawings.

[0011] [Fall prevention structure for corner drop beams 10] FIG. 1 is a schematic diagram of the fall prevention structure for a corner drop suspension beam according to the first embodiment. (hanging beam 20) The hoisting beam 20 has a beam body 22 , a hoisting hook 40 , and legs 60 . The beam body 22 is a flat member that can be inserted between the gate grooves installed in the waterway, facing the upper surface of the stopper. The beam body 22 is provided on its upper surface with a hoisting device 23 for hanging a crane hook, wire, etc. of a lifting crane. The hoisting hook 40 is a member that hangs down from the underside of the beam body 22 and is hooked onto the corner-dropped hoisting fitting 14, and has a counterweight 45. The lifting hook 40 is pivotally supported by a pin 24 arranged on the beam body 22, with its axis positioned on the beam body 22 along the width direction (direction perpendicular to the longitudinal direction) of the beam body 22. If the direction in which the lifting beam 20 is lifted or lowered is defined as the X-axis, the longitudinal direction of the beam body 22 as the Y-axis, and the direction perpendicular to the X-axis and Y-axis as the Z-axis, the lifting hook 40 is formed to be able to swing around the Z-axis. The upper end of the lifting hook 40 is pivotally supported by the pin 24, and the lower end is formed in a fishhook shape that can be hooked onto the lifting fitting 14.

[0012] The counterweight 45 has its lower end pivotally supported by the pin 24 and has a weight attached to its upper end. The counterweight 45 is configured to be swingable around the axis of the pin 24 so as to rotate together with the hanging hook 40. The counterweight 45 is configured so that the angle between the center line along the longitudinal direction of the main body and a perpendicular line passing through the pin 24 can be changed to any set angle, which will be described later. The set angle of the counterweight 45 is the angle at which the hoisting hook 40 is tilted toward the side opposite to the side where it is hung on the hoisting fitting 14 (the end side of the beam body 22) with respect to the perpendicular line passing through the pin 24, and in this embodiment is set to 45 degrees as an example. This allows the hook point of the hoisting hook 40 to be biased in the direction approaching the hoisting fitting. On the other hand, when removing the hoisting hook 40, the angle at which the hoisting hook 40 is tilted toward the same side (the center side of the beam body 22) as the side where it is hooked onto the hoisting fitting 14 with respect to the perpendicular line passing through the pin 24 is set to 30 degrees in this embodiment, for example. This allows the hook point of the hoisting hook 40 to be biased in a direction away from the hoisting fitting 14.

[0013] Two such hanging hooks 40 are attached at positions symmetrical to the center of the beam body 22 and on a perpendicular line passing through the hanging fitting 14 of the corner stop 12. The leg 60 is provided on the underside of the beam body 22 opposite the upper surface of the chamfer 12. The leg 60 of Example 1 shown in Fig. 1 is configured to have multiple large and small cylindrical bodies (two in this embodiment) with different diameters that can be extended and retracted up and down. Such leg 60 is provided near the attachment position of the hanging hook 40. The drive unit 70 is connected to the leg unit 60 and can be extended or retracted. The drive unit 70 can be driven by an electric motor, hydraulic pressure, or air pressure. FIG. 2 is a schematic diagram of the fall prevention structure for a corner drop hanging beam of Example 2. The leg 60A of Example 2 employs a tilting structure. The other configurations are the same as those of FIG. 1, and detailed description thereof will be omitted. The leg 60A of Example 2 is pivotally supported by a leg pin 62 whose axis is located along the underside of the beam main body 22. The length of the leg 60A is set so that when the leg is opened, in other words, when the longitudinal direction is aligned vertically, the lower end contacts the upper surface of the corner drop 12. When the leg 60A is closed, the longitudinal direction is aligned along the underside of the beam main body 22. The tilting of the leg 60A can be achieved by a drive unit 70.

[0014] [Effect] The operation of the fall prevention structure for the corner drop beam of the present invention having the above configuration will be described below. (hoisting) FIG. 3 is an explanatory diagram of the lifting of a stopper using the drop prevention structure for a stopper lifting beam of the present invention. The counterweights 45 are positioned so that the hoisting hooks 40 are engaged with the hoisting fixtures 14. For example, as shown in FIG. 3, the counterweights 45 are tilted 45 degrees apart from each other with respect to a vertical line passing through the axis of the pin 24. When the beam body 22 is lowered, the tip of the lifting hook 40 comes into contact with the lifting fitting 14 of the corner stopper 12. When it is lowered further, the lifting hook 40 swings in the opening direction. After that, the moment of the counterweight 45 that rotates together with the lifting hook 40 acts, causing the lifting hook 40 to swing in the closing direction, and it can be hooked onto the lifting fitting 14. After the hooking operation, the leg 60 is extended by the drive unit 70 so as to contact the upper surface of the corner stopper 12. This allows the hooking operation of the lifting hook 40 to be fixed while the corner stopper 12 is being lifted. 5 is an explanatory diagram of the fall prevention structure of the present invention for the corner stopper lifting beam when the corner stopper tilts. Even if the corner stopper 12 tilts during lifting, the leg 60 secures the hanging hook 40, so the hanging bracket 14 can be securely attached to the hanging hook 40, preventing the corner stopper 12 from falling.

[0015] (removal) FIG. 4 is an explanatory diagram of the removal of a corner stopper using the drop prevention structure for a corner stopper hanging beam of the present invention. The counterweight 45 is positioned so that the lifting hook 40 moves away from the lifting fitting 14. As an example, as shown in Figure 4, the counterweights 45 are tilted 30 degrees in the direction that they move closer to each other with respect to a vertical line passing through the axis of the pin 24. The chamfer 12 is then moved to the waterway. In the waterway, the chamfer 12 is lowered and placed on top of the chamfer 12 that has already been placed. After that, when the leg 60 is retracted by the drive unit 70, the lifting hook 40 is released from its engagement, or in other words, removed, because the counterweight 45 is biasing the hook point of the lifting hook 40 in the direction that moves away from the lifting fitting 14. When the stopcock 12 is hoisted into the waterway using the beam body 22, the wire of the hoisting crane is left slack. This eliminates the need for the cumbersome task of removing the hoisting hook 40 while lowering the beam body 22 using conventional crane operation, and allows removal by the simple task of shortening the leg 60. The leg 60A of the second embodiment can also perform the lifting and removal work of the corner stopper 12 in the same manner.

[0016] According to the present invention, the simple structure of the legs that extend or tilt from the beam body prevents the corner stopper from coming off the hanging hook when being lifted, and reliably prevents the corner stopper from falling. Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various modifications can be made without departing from the spirit and scope of the present invention. Furthermore, the present invention is not limited to the combinations shown in the embodiments, but can be implemented in various combinations. [Explanation of symbols]

[0017] 10 Fall prevention structure for corner drop beams 12 Corner Drop 14 Hanging hardware 20 Hanging beam 22 Beam body 23 Hanging equipment 24-pin 40 Hanging hook 45 Counterweight 60,60A Legs 62 Leg pin 70 Drive unit

Claims

[Claim 1] In a fall prevention structure for a corner stopper lifting beam, a lifting hook rotatably attached to a beam body is hooked onto a lifting fixture provided on the corner stopper to lift the corner stopper, a leg portion tilting downward from the beam body toward the upper surface of the chamfer; The fall prevention structure for a corner stopper lifting beam is characterized in that the legs are opened to contact the upper surface when the corner stopper is lifted, thereby fixing the hanging hook, and are equipped with a drive unit that closes the legs to remove the hanging hook when the corner stopper is removed.

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