Fall prevention safety rope support device

Abstract

The present invention provides a fall prevention lifeline support device that can be quickly and reliably attached to a stable position on a beam reinforcement assembly, and whose position can be easily changed after installation as needed. [Solution] The assembly comprises a base plate 13 placed on a beam reinforcement assembly 50, a support column 12 vertically attached to the base plate 13, a hook fitting 17 having a hook portion 17D capable of engaging and locking the main beam reinforcement 51 on the lower surface side of the base plate 13, an operating handle shaft 16 rotatable around a vertical rotation axis and provided alongside the support column 12, and a control mechanism 18 provided between the hook fitting 17 and the operating handle shaft 16, which can move the hook fitting 17 in a direction that engages and holds the hook portion 17D with the main beam reinforcement 51 and in a direction that releases engagement by moving away from the main beam reinforcement 51, depending on the rotation direction of the operating handle shaft 16.

Description

Technical Field

[0001] The present invention relates to a fall prevention main cable support device that supports a main cable for connecting a lifeline to prevent a fall when walking on reinforcing bars at a construction site, for example.

Background Art

[0002] Generally, when constructing a building, at a construction site, a beam reinforcing bar assembly composed of a plurality of reinforcing bars is constructed at a place where concrete is to be placed, and then a formwork is installed and concrete is placed. When constructing the beam reinforcing bar assembly or installing the formwork, there is a risk of accidentally falling from above the assembled bars downward and getting injured.

[0003] Therefore, in order to prevent a fall when walking on reinforcing bars at a construction site, a main cable support for supporting a main cable for connecting a lifeline is installed on the beam reinforcing bar assembly, and the main cable is stretched using the main cable support, and a method of attaching a lifeline to the main cable is known (see, for example, Patent Document 1).

[0004] The main cable support device known from Patent Document 1 includes a base plate disposed on a plurality of stirrup bars, a support pipe provided on the base plate, a fastening rod having a hook portion at its lower end and being axially movably incorporated into the support pipe through the base plate, and a handle having a nut screwed to a male screw provided at the upper end of the fastening rod and fastening the hook portion to the beam main reinforcement. Then, in a state where the hook portion is moved downward and not fastened to the beam main reinforcement, the beam main reinforcement is disposed inside the hook portion, and when the handle is turned to move the fastening rod upward, the hook portion is fastened to the fastening rod as it moves upward, and the main cable support is vertically fixed to the beam main reinforcement by the base plate and the hook portion. In this way, the main cable support device is provided on the stirrup bars at a predetermined interval, and then, if necessary, the main cable is sequentially passed through and stretched into a ring provided at the head of the handle provided on each main cable support device, and a lifeline is attached to the stretched main cable.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2020-180507 (Figure 5) [Overview of the project] [Problems that the invention aims to solve]

[0006] However, in the lifeline support device described in Patent Document 1 mentioned above, if the lifeline is passed sequentially through the ring provided on the head of the handle and stretched between the lifeline support devices, the handle cannot be easily turned after the lifeline is stretched. In other words, once the lifeline is stretched, it is not easy to change the position of the lifeline support devices afterward.

[0007] Furthermore, it is difficult to securely fasten the lifeline to each lifeline support device, which poses a reliability problem.

[0008] Therefore, a technical problem arises that needs to be solved in order to provide a fall prevention lifeline support device that can be quickly and reliably attached to a stable position on a beam reinforcement assembly, and whose position can be easily changed after attachment as needed. The present invention aims to solve this problem. [Means for solving the problem]

[0009] The present invention was proposed to achieve the above objective, and the invention described in claim 1 provides a fall prevention lifeline support device to be attached to a beam reinforcement assembly made of a plurality of beam main reinforcements, comprising: a base plate disposed on the beam reinforcement assembly; a support column suspended from the base plate; a hook fitting having a hook portion that can engage and lock with the beam main reinforcement on the lower surface side of the base plate; an operating handle shaft that is rotatable around a vertical rotation axis and provided alongside the support column; and a control mechanism provided between the hook fitting and the operating handle shaft, which can move the hook fitting in a direction in which the hook portion engages and holds with the beam main reinforcement and in a direction in which it moves away from the beam main reinforcement and releases engagement, depending on the rotation direction of the operating handle shaft.

[0010] In this configuration, with the hook portion of the hook fitting moved to the unlocked position and in a position where the hook portion can engage and lock with the main reinforcement of the beam reinforcement assembly, the base plate is placed on the beam reinforcement assembly. Then, the operating handle shaft, which is provided separately from the support column and adjacent to it, is rotated in the direction of the locked position using, for example, an impact wrench. This moves the hook fitting to the locked position, the hook portion of the hook fitting engages with the main reinforcement of the beam, and the support column is engaged and locked onto the beam reinforcement assembly via the hook fitting and the main reinforcement of the beam. Conversely, when it is desired to move the support column to another location, the operating handle shaft is rotated in the direction of the unlocked position, which is opposite to the direction of the locked position, using an impact wrench or the like. This moves the hook fitting to the unlocked position, the hook portion of the hook fitting separates from the main reinforcement of the beam and disengages. This allows the support column to be moved to another location on the beam reinforcement assembly and re-engaged and locked at that new location.

[0011] Therefore, the locking mechanism can be quickly and reliably installed in a stable position on the beam reinforcement assembly using an impact wrench or similar tool, and its position can be easily changed after installation as needed. Furthermore, since the locking or unlocking of the locking mechanism is performed by rotating the operating handle shaft, which is located separately from the support column, using an impact wrench or similar tool, the position of the support column can be easily moved and changed together with the lifeline, even if a lifeline is already stretched across the top of the support column.

[0012] The invention described in claim 2 provides a fall prevention lifeline support post device, wherein, in the configuration described in claim 1, the support post is equipped with a lifeline attachment ring having four lifeline attachment holes through which the lifeline can be passed in four directions.

[0013] With this configuration, the lifelines can be attached in four directions using the four lifeline attachment holes provided in the support column, so that the support column is held stably in the center position by being pulled from four directions by the four lifelines placed on the beam reinforcement assembly.

[0014] The invention described in claim 3 provides a fall prevention lifeline support device, wherein, in the configuration described in claim 1 or 2, the hook portion, when positioned in the locked position, has a lock center located near the approximate axial centerline of the support column.

[0015] With this configuration, the locking center is located near the approximate axial centerline of the support column, allowing the locked column to be held in a vertical position and securely locked in place.

[0016] The invention described in claim 4 provides a fall prevention lifeline support device in which, in the configuration described in claim 1, the locking part locks the main reinforcement of the beam between itself and the base plate.

[0017] This configuration allows for the main reinforcement of the beam to be sandwiched between the locking mechanism and the base plate, creating a strong locking mechanism.

[0018] The invention described in claim 5 provides a fall prevention lifeline support device, wherein, in the configuration described in claim 1, the control mechanism comprises a male screw portion formed on the outer circumferential surface of the operating handle shaft, and a cylindrical portion formed integrally with the hook fitting on the upper end side of the hook fitting, through which the operating handle shaft is inserted, and a female screw portion on the inner circumferential surface of the cylindrical portion that is screwed and connected to the male screw portion to screw the hook fitting in the direction of the locked position and the direction of the unlock position according to the rotation direction of the operating handle shaft.

[0019] With this configuration, when the operating handle shaft is rotated, the male and female threaded parts engage, causing the hook fitting to screw in either the locked or unlocked position according to the direction of rotation of the operating handle shaft, making it easy to lock and unlock the hook. [Effects of the Invention]

[0020] According to the present invention, by rotating an operating handle shaft, which is provided parallel to the support column separately from the support column, using, for example, an impact wrench, the hook fitting moves to the locked or unlocked position depending on the direction of rotation, allowing for easy engagement locking or disengagement of the hook portion of the hook fitting. Furthermore, the support column can be moved to another position on the beam reinforcement assembly as needed, and the hook can be re-engaged and locked at the moved position. This allows for quick and reliable installation in a stable position on the beam reinforcement assembly, and also allows for easy repositioning after installation as needed, thereby improving work efficiency and safety. In addition, since the locking or unlocking of the lock fitting is performed by rotating an operating handle shaft provided separately from the support column, even if a lifeline is already stretched over the top of the support column, the position of the support column can be quickly and easily moved and changed together with the lifeline, further improving work efficiency. [Brief explanation of the drawing]

[0021] [Figure 1] This is a side view of a fall prevention safety rope support device shown as an embodiment of the present invention. [Figure 2] It is a plan view seen from the A-A direction of FIG. 1. [Figure 3] It is an enlarged side view of the base of the fall prevention main cable support device, (a) is a view showing the unlocked state, and (b) is a view showing the locked state. [Figure 4] It is a cross-sectional view taken along the B-B line of FIG. 3. [Figure 5] It is a perspective view showing the use state of the fall prevention main cable support device.

Mode for Carrying Out the Invention

[0022] The present invention provides a fall prevention main cable support device that can be quickly and surely attached to a stable position on a beam reinforcement assembly and can be easily repositioned after attachment if necessary. To achieve this purpose, a fall prevention main cable support device is attached to a beam reinforcement assembly formed by combining a plurality of beam main reinforcements, comprising a base plate disposed on the beam reinforcement assembly, a support column vertically provided on the base plate, a hook fitting having a hook portion capable of engaging, locking, and holding the beam main reinforcement on the lower surface side of the base plate, an operation handle shaft rotatable around a vertical rotation axis provided side by side with the support column, and a control mechanism portion provided between the hook fitting and the operation handle shaft and capable of moving and operating the hook fitting in the direction of a lock position where the hook portion engages and holds the beam main reinforcement and in the direction of an unlock position where the engagement is released away from the beam main reinforcement according to the rotation direction of the operation handle shaft.

Example

[0023] Hereinafter, an example according to an embodiment of the present invention will be described in detail based on the accompanying drawings. In the following examples, when referring to the number, numerical value, quantity, range, etc. of components, unless specifically stated or limited to a specific number in principle, it is not limited to that specific number, and it may be more or less than the specific number.

[0024] Furthermore, when referring to the shape, positional relationship, etc. of constituent elements, unless otherwise explicitly stated or it is clearly considered not to be so in principle, this includes things that are substantially similar or alike to those shapes, etc.

[0025] Furthermore, drawings may exaggerate features by enlarging characteristic parts to make them easier to understand, and the dimensional ratios of components may not be the same as in reality. Also, in cross-sectional drawings, hatching of some components may be omitted to make the cross-sectional structure of the components easier to understand.

[0026] Furthermore, in the following description, expressions indicating directions such as up and down or left and right are not absolute. They are appropriate when each part of the fall prevention lifeline support device of the present invention is depicted in the orientation shown, but should be interpreted in accordance with the change in orientation if that orientation changes. Also, the same reference numerals are used for the same elements throughout the description of the embodiments.

[0027] Figures 1 to 4 show the fall prevention lifeline support device 10 (hereinafter simply referred to as "support device 10") according to the present invention. Figure 1 is an external side view thereof, Figure 2 is a plan view taken from the direction of line AA in Figure 1, and Figure 3 is an enlarged side view of the base 12A of the support device 10, where (a) shows the unlocked state and (b) shows the locked state. Figure 4 is a cross-sectional view of BB in Figure 3. Figure 5 is a perspective view showing the support device 10 in use.

[0028] In Figures 1 to 5, the support device 10 is attached to the beam reinforcement assembly 50, as shown in Figure 5.

[0029] The beam reinforcement assembly 50 is a generally well-known assembly and consists of multiple straight beam main reinforcements 51 and multiple stirrup reinforcements 52, etc. The beam main reinforcements 51 consist of multiple (four in this embodiment) X-axis beam main reinforcements 51A extending in the X-axis direction, arranged at equal intervals and approximately parallel to each other on the same horizontal plane, and multiple (four in this embodiment) Y-axis beam main reinforcements 51B extending in the Y-axis direction, arranged at equal intervals and approximately parallel to each other on the horizontal plane, intersecting the X-axis beam main reinforcements 51A at approximately right angles.

[0030] The main reinforcement bars 51A for the X-axis beam and 51B for the Y-axis beam are each arranged within a quadrilateral region in cross-section. The main reinforcement bars 51A for the X-axis beam, arranged within the quadrilateral region, are integrated with multiple stirrup bars 52 arranged to cover the outside of the quadrilateral region by being bound together with wires or the like (not shown). Similarly, the main reinforcement bars 51B for the Y-axis beam, also arranged within the quadrilateral region, are integrated with multiple stirrup bars 52 arranged to cover the outside of the quadrilateral region by being bound together with wires or the like (not shown). Furthermore, the main reinforcement bars 51A for the X-axis beam and 51B for the Y-axis beam are also integrated with wires or the like (not shown) to form a beam reinforcement assembly 50.

[0031] Formwork is placed around these beam reinforcement assemblies 50 (not shown), and concrete is poured into the formwork to construct a structural frame consisting of concrete and the beam reinforcement assemblies 50. When workers stand on the beam reinforcement assemblies 50 to perform various tasks, such as when placing formwork on the outside of the beam reinforcement assemblies 50, support devices 10 are attached to the beam reinforcement assemblies 50 at predetermined intervals, as shown in Figure 4, and the support devices 10 are connected to each other by a lifeline 11. Furthermore, a hook attached to one end of a safety belt lanyard (not shown) attached to the worker's waist or elsewhere is attached to the lifeline 11, and the worker walks with this hook attached.

[0032] As shown in Figures 1, 2, and 5, the support device 10 has a base 12A and an upper support portion 12B. The base 12A and the upper support portion 12B are formed separately, but when in use they are integrated so that the upper end portion of the base support 14 on the base 12A and the lower end portion of the support portion 23 on the upper support portion 12B are connected, and the device is used as a single support 12.

[0033] The base 12A includes a base plate 13, a base support column 14, a rib 15, an operating handle shaft 16, a hook fitting 17, a control mechanism 18, a handle 19, and the like.

[0034] The base plate 13 is a flat metal plate and, as shown in Figure 2, has four protruding pieces 13A extending radially from the center in four directions, forming a roughly cross shape. The base plate 13 is also provided with a hook through-hole 13B through which the hook portion 17D of the hook fitting 17 passes, allowing the hook fitting 17 to move vertically. The position on the base plate 13 where the hook through-hole 13B is provided is a position where no protruding pieces 13A are provided, that is, a position between the protruding pieces 13A.

[0035] A base support column 14 is vertically mounted on the base plate 13, with the axis of the base support column 14 aligned with the center of the base plate 13. The base support column 14 is formed in a cylindrical shape from a metal member, with its lower end fixed to the base plate 13 by welding or the like, and its upper end (upper portion) being open. Ribs 15 are provided on the outer surface of the base support column 14, corresponding to each of the protruding pieces 13A. Each rib 15 is in the shape of a roughly right triangle, and as shown in Figures 1 and 3, its vertical side abuts against the outer surface of the base support column 14 and its horizontal piece abuts against the upper surface of the base plate 13, and the contact points are welded to the base support column 14 and the base plate 13, respectively, thereby integrating the base plate 13, the base support column 14, and the ribs 15.

[0036] Furthermore, a hook cover 20 is vertically mounted on the upper surface of the base plate 13, corresponding to the hook through hole 13B. The hook cover 20 is a metal component, and as shown in Figure 4, its horizontal cross-section is formed in a U-shape. Its opening on one side is brought into contact with the outer surface of the base support 14, and it is welded and fixed in this contact state, thereby integrating it with the base plate 13 and the base support 14. Within the inner region on the lower end side of the hook cover 20, a slit-shaped hook through hole 13B is provided, through which the hook plate 17B of the hook fitting 17, which will be described later, passes.

[0037] Furthermore, an operating handle shaft 16 is provided inside the hook cover 20. The operating handle shaft 16 is provided inside the hook cover 20, extending vertically alongside the base support column 14 (support column 12). The lower end of the operating handle shaft 16 is rotatably held by a bearing portion 21 that extends horizontally from the inner surface of the hook cover 20, and the upper end is rotatably held around a vertical rotation axis via a rotating support member 22 attached to the upper part of the hook cover 20. The upper end of the operating handle shaft 16 protrudes upward through the upper end of the hook cover 20, i.e., the rotating support member 22, and an operating knob 16A is integrally rotatably attached to this protruding portion. Therefore, the operating handle shaft 16 can be rotated in both left and right directions by rotating it with, for example, an impact wrench. In addition, a male threaded portion 16B is formed on the outer circumferential surface of the operating handle shaft 16 that is covered by the hook cover 20.

[0038] The hook fitting 17 is a metal component and has a hollow cylindrical portion 17A and a plate-shaped hook plate 17B that is integrated with the cylindrical portion 17A and hangs downward from the side of the cylindrical portion 17A. The inner circumferential surface of the cylindrical portion 17A has a female threaded portion 17C that screws into the male threaded portion 16B of the operating handle shaft 16. The hook plate 17B is provided so as to protrude below the lower surface (back surface) of the base plate 13, passing through the hook through hole 13B of the base plate 13, and has a hook portion 17D at its lower end. The hook fitting 17 is attached to the operating handle shaft 16 by screwing the male threaded portion 16B and the female threaded portion 17C together with the operating handle shaft 16 passing through the cylindrical portion 17A vertically. When the hook fitting 17 is attached to the operating handle shaft 16, the hook portion 17D protrudes below the base plate 13, as shown in Figures 1 and 5. The position of the hook portion 17D is set such that when the hook fitting 17 is positioned in the locked position shown in Figure 3(b) described later, its locking center is near the approximate axial centerline O of the base support column 14, including the axial centerline O. Note that the locking center being near the approximate axial centerline O means, for example, that in a plan view, the locking center is contained within the base support column 14.

[0039] Furthermore, the male threaded portion 16B formed on the operating handle shaft 16 and the female threaded portion 17C formed on the cylindrical portion 17A and screwed together with the male threaded portion 16B constitute a control mechanism 18 that selectively screws the hook fitting 17 upward (hereinafter referred to as the "locked position direction") and downward (hereinafter referred to as the "unlocked position direction") according to the rotation direction of the operating handle shaft 16.

[0040] In other words, the control mechanism 18 is configured such that when the operating handle shaft 16 is rotated in the negative direction indicated by arrow U in Figure 3(a), the hook fitting 17 is screwed downward, i.e., towards the unlocked position, and when it is rotated in the positive direction indicated by arrow L in Figure 3(b), the hook fitting 17 is screwed upward, i.e., towards the locked position.

[0041] The handle 19 is for workers to carry the fall prevention safety rope support device 10 by hand when moving or transporting it, and is fixedly attached to the outer surface of the base support 14.

[0042] Next, the structure of the upper part 12B of the support column will be described. As shown in Figures 1, 2, and 5, the upper part 12B of the support column includes a support column section 23 and a main rope attachment ring 24, etc.

[0043] The support portion 23 of the upper part 12B of the support column is a cylindrical metal member, and a part of its lower end (lower end portion) is inserted into the upper opening (upper end portion) of the base support column 14 and is detachably fixed with a bolt, thereby integrating it with the base support column 14. A cap 25 is attached to the upper opening of the support portion 23 to close it. The main rope attachment ring 24 is attached to the outer circumference of the upper end portion of the upper part 12B of the support column, with the center of the main rope attachment ring 24 passing through the upper end portion of the upper part 12B of the support column, and the main rope attachment ring 24 is attached in a horizontal flange shape, and the main rope attachment ring 24 and the upper part 12B of the support column are welded together.

[0044] As shown in Figures 1, 2, and 5, the lifeline attachment ring 24 is a flat metal plate and, as shown in Figure 2, has a through hole 24A in the center through the upper part 12B of the support column, and has four protruding pieces 24B extending radially from the center in four directions, forming a roughly cross shape. The lifeline attachment ring 24 is also provided with a lifeline hook fitting 24C to which the lifeline hook fitting 26, which is fixedly provided at the end of the lifeline 11, can be detachably attached. The attachment position of the lifeline attachment ring 24 to the base plate 13 of the base portion 12A is such that the protruding piece 13A of the base plate 13 and the protruding piece 24B of the lifeline attachment ring 24 are offset from each other by 45°, as shown in Figure 2.

[0045] Next, the procedure for attaching the support device 10 to the beam reinforcement assembly 50 will be explained. When installing the support device 10 to the beam reinforcement assembly 50, either the upper part of the support 12B is assembled to the base 12A and the base 12A and the upper part of the support 12B are installed as a single unit, or the base 12A is attached to the beam reinforcement assembly 50 first, and then the upper part of the support 12B is attached to the base 12A afterwards can be used.

[0046] When installing the support device 10 to the beam reinforcement assembly 50, as shown in Figure 3(a), the operating knob 16A of the operating handle shaft 16 is turned in the negative direction (direction of arrow U), and the hook fitting 17 is moved downward (towards the unlocked position) as shown in Figure 3(a), so that the hook portion 17D is far away from the lower surface of the base plate 13, and the main beam reinforcement 51 of the beam reinforcement assembly 50 can be positioned between the hook portion 17D and the base plate 13.

[0047] Then, the base plate 13 with base portion 12A is placed on the main beam reinforcement 51. Alternatively, it may be placed on a beam reinforcement assembly 50 where the X-axis beam reinforcement 51A and Y-axis beam reinforcement 51B intersect in the XY direction. In this case, the base plate 13 is placed so that its four protruding pieces 13A straddle the X-axis beam reinforcement 51A and Y-axis beam reinforcement 51B. When the base plate 13 is placed on the main beam reinforcement 51, or on the X-axis beam reinforcement 51A and Y-axis beam reinforcement 51B, the hook portion 17D is positioned below the main beam reinforcement 51 from the lower surface of the base plate 13. As shown in Figure 3(a), the position of the base plate 13 is adjusted so that the hook portion 17D can engage with the main beam reinforcement 51.

[0048] After adjusting the position of the base plate 13, as shown in Figure 3(b), the operating knob 16A of the operating handle shaft 16 is turned in the forward direction (direction of arrow L) to move the hook fitting 17 upward (direction of the locked position), and the main beam reinforcement 51 of the beam reinforcement assembly 50 is positioned between the hook portion 17D and the base plate 13, thus creating a locked state. This installs the support device 10 on the beam reinforcement assembly 50. In this state, the upper side of the beam reinforcement assembly 50 is held down by the base plate 13 and the lower side of the beam reinforcement assembly 50 is held down by the hook portion 17D, so the support device 10 is securely fixed and held on the beam reinforcement assembly 50. Multiple support devices 10 can be placed on the beam reinforcement assembly 50 as needed in this manner.

[0049] Once multiple support devices 10 are installed on the beam reinforcement assembly 50, a lifeline 11 is prepared, and the lifeline hook fittings 26 attached to both ends of the lifeline 11 are hooked into the lifeline attachment holes 24C of the corresponding support devices 10 located in adjacent positions, thereby stretching the lifeline 11 between adjacent support devices 10. Furthermore, if multiple support devices 10 are arranged in the X and Y directions, as shown in Figure 5, one end of each of the four lifelines 11 is attached to one of the four lifelines 11 so that four lifelines 11 are stretched radially in the X and Y directions from one support device 10, respectively. Furthermore, by attaching a hook from one end of a safety belt lanyard (not shown), which is attached to the worker's waist or other body part, to the main rope 11 stretched between the support devices 10, the worker can walk safely.

[0050] As described above, in the support device 10 according to this embodiment, by rotating the operating handle shaft 16, which is provided parallel to the support column 12 separately from the support column 12, the hook fitting 17 can be locked or unlocked depending on the direction of rotation. Furthermore, if it becomes necessary to move the support device 10 to another position on the beam reinforcement assembly 50 after the support device 10 has been locked and installed, the lock can be released once and then re-engaged and locked at the moved position, so that the position can be easily changed after installation as needed. In addition, since the operation of locking or unlocking the hook fitting 17 is performed by rotating the operating handle shaft 16, which is provided at a different position from the support column 12, even if the main rope 11 is already stretched over the top of the support column 12, the position of the support device 10 can be easily moved and changed together with the main rope 11.

[0051] Furthermore, the present invention can be modified or combined in various ways without departing from the spirit of the invention, and it goes without saying that the present invention extends to such modified or combined forms. [Explanation of Symbols]

[0052] 10: Safety rope support device for preventing falls (support device) 11: Main rope 12: Strut 13: Base plate 13B: Through hole for hook 14: Base strut 16: Operating handle shaft 16A: Operation knob 16B: Male threaded section 17: Hook fittings 17A: Cylindrical part 17B: Hook Plate 17C: Female thread section 17D: Hook part 18: Control mechanism 24: Main rope attachment ring 24C: Main rope attachment hole 26: Main rope hook fitting 50: Beam reinforcement assembly 51: Beam main reinforcement O: Axis center line

Claims

1. A fall prevention safety rope support device that is attached to a beam reinforcement assembly made by combining multiple beam main reinforcements, A base plate placed on the beam reinforcement assembly, A support column suspended from the base plate, A hook fitting having a hook portion that can engage and lock onto the main reinforcement of the beam on the lower surface side of the base plate, An operating handle shaft that is rotatable around a vertical rotation axis, provided alongside the aforementioned support column, A control mechanism is provided between the hook fitting and the operating handle shaft, and is capable of moving the hook fitting in a direction that engages and holds the main beam reinforcement and in a direction that releases engagement by moving away from the main beam reinforcement, depending on the rotation direction of the operating handle shaft. A fall prevention safety rope support post device characterized by being equipped with the following features.

2. The fall prevention lifeline support post device according to claim 1, characterized in that the support post is equipped with a lifeline attachment ring having four lifeline attachment holes that allow lifelines to be passed in four directions.

3. The fall prevention lifeline support device according to claim 1 or 2, characterized in that when the hook portion is positioned in the locked position, the position of the lock center is located near the approximate axial center line of the support column.

4. The fall prevention lifeline support device according to claim 1, characterized in that the hook portion locks the main reinforcement of the beam between itself and the base plate.

5. The control mechanism unit is A male threaded portion formed on the outer circumferential surface of the aforementioned operating handle shaft, The upper end of the hook fitting has a cylindrical portion formed integrally with the hook fitting and through which the operating handle shaft is inserted, and the inner circumferential surface of the cylindrical portion has a female screw portion that is screwed and connected to the male screw portion and screws the hook fitting in the direction of the lock position and the unlock position according to the rotation direction of the operating handle shaft, The fall prevention lifeline support device according to claim 1, characterized by comprising the above.

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