JP2022024389A - Scaffold board fixing device - Google Patents

Abstract

To provide a scaffold board fixing device that can be utilized as a means for fixing a scaffold board to a supporting steel pipe when a temporary work scaffold is assembled under a bridge, for example.SOLUTION: A scaffold board fixing device is provided with a first hook 3 and a second hook 4 to be engaged with a supporting steel pipe 1, a belt fastening unit 5, and a fastening belt 6 whose one end is connected to the upper end of the first hook 3; the belt fastening unit 5 comprises: a main body 16 having one end axially supported and connected to the upper end of the second hook 4 by a first horizontal support shaft 21 so as to be freely undulated, and extending to the second hook 4 toward the side opposite to the side on which a scaffolding board 2 is located; an operating piece axially supported and connected to the other end of the main body by a second horizontal support shaft 24 so as to be freely undulated; and a detachable engaging means 18 for automatically engaging the operation piece with the body 16 when the operation piece is laid down so as to be superposed on the body 16; the whole of the belt fastening unit 5 is projected to the outside of one side of the scaffold board 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a scaffolding board fixing device that can be used, for example, when assembling a temporary work scaffolding under a bridge.

When assembling a temporary work scaffolding under a bridge, a scaffolding board of a certain width is placed on a supporting steel pipe that is hung horizontally at an almost constant height under the bridge and paralleled at appropriate intervals, and this scaffolding board is placed. Temporary work scaffolding is assembled by fixing to the supporting steel pipe. As a scaffolding plate fixing device that can be used when assembling such a temporary work scaffolding, as described in Patent Document 1, a pair of hooks that can be hooked on supporting steel pipes on both sides of the scaffolding plate are attached to the scaffolding plate. Those connected by a belt on the upper side are known.

JP-A-2015-86593

In the conventional scaffolding plate fixing device as described in Patent Document 1, since the belt fastening unit for holding the belt in a tense state is placed on the upper side of the scaffolding plate, walking on the scaffolding plate. There was a problem in terms of safety because it became a protruding foreign object that would make the worker stumble. Moreover, the belt fastening unit mounted on the upper side of the scaffolding plate is separately connected to the two hook members engaged with the supporting steel pipes adjacent to the left and right sides of the scaffolding plate by belts. Book belts were to be used, and the number of parts was large.

The present invention proposes a scaffold plate fixing device capable of solving the above-mentioned conventional problems, and the scaffold plate fixing device according to the present invention understands the relationship with the examples described later. For the sake of simplicity, the reference numerals used in the description of the embodiment are shown in parentheses, the first hook (3) and the second hook (4) to be engaged with the supporting steel pipe (1), and the belt. The fastening unit (5) is provided with one fastening belt (6) having one end connected to the upper end of the first hook (3), and the belt fastening unit (5) has one end of the second hook (4). The main body (16), which is undulatingly connected to the upper end by the first horizontal support shaft (21) and extends to the side opposite to the side where the scaffold plate (2) is located with respect to the second hook (4). The operation piece (17) undulatingly connected to the other end of the main body (16) by the second horizontal support shaft (24), and the operation piece (17) were laid down so as to overlap the main body (16). Occasionally, the operation piece (17) is provided with a detachable engaging means (18) that automatically engages the operation piece (17) with the main body (16), and the operation piece (17) is provided with a fastening belt (18) at an intermediate position between both ends. An opening (25) for inserting 6) in the vertical direction is provided, and the first hook (3) and the second hook (4) are provided on both sides of the scaffold plate (2) supported on the supporting steel pipe (1). The fastening belt (6), which is engaged with the supporting steel pipe (1) adjacent to the side and extends from the first hook (3), is passed over the scaffold plate (2) and then the second hook ( 4) The lower side of the first horizontal support shaft (21), the lower side of the second horizontal support shaft (24), and the opening (25) of the operation piece (17) via the operation piece (17) in this order. ), And is passed in the opposite direction between the fastening belt (6) located below the second horizontal support shaft (24) and the second horizontal support shaft (24), and the operation piece. (17) is engaged with the main body (16) by the engaging means (18) in a state of being stacked on the main body (16), and the entire belt fastening unit (5) is one of the scaffold plates (2). It is configured to protrude to the outside of the side.

According to the configuration of the present invention, the belt fastening unit is integrated with the second hook on one side via the first horizontal support shaft, and the main body of the belt fastening unit is scaffolded from the upper end of the second hook. Since the belt fastening unit extends to the side opposite to the side with the board, there is no risk that the belt fastening unit will get on the upper side of the scaffold board, and the operator can safely walk on the scaffold board. Moreover, the belt is divided into two parts and connected to the first hook and the second hook, and compared to the conventional configuration in which both belts are connected by the belt fastening unit, only one belt is connected to the first hook. Therefore, the number of parts is reduced and handling is easy.

When the present invention is carried out, specifically, an opening (36) through which the fastening belt (6) is inserted in the vertical direction at the end of the main body (16) on the second horizontal support shaft (24) side. Is provided, and the free end of the fastening belt (6) is guided to the outside of the operation piece (17) by inserting the opening (25) on the operation piece (17) side in the opposite direction. It can be configured so that it can be pulled out to the lower side of the main body (16) via the opening (36) on the main body (16) side. According to this configuration, the extra length portion on the free end side of the belt generated when used for a narrow scaffold plate can be easily pulled out below the main body of the belt fastening unit, that is, in a direction that does not get in the way. Can be done. Therefore, it is not necessary to pull out the extra length portion of the belt from between the main body of the belt fastening unit and the operation piece toward the scaffolding plate, and it becomes easy to dispose of the extra length portion of the belt.

Further, the upper end portion of the second hook (4) is formed in a U shape in a plan view provided with the left and right side plate portions (14a, 14b) protruding outward from the substrate (12), and the upper end portion of the U shape is formed. The left and right side plate portions (19a, 19b) of the main body (16) are undulatingly connected to (13) by the first horizontal support shaft (21), and the U-shaped upper end portion (U-shaped upper end portion) of the second hook (4) is connected. The bottom plate portion in 13) is provided with a notch recessed portion (4a) formed notch from the upper end edge thereof, and the fastening belt (6) passes through the notch recessed portion (4a) to the first horizontal support shaft (6). It can be configured to be inserted under 21). According to this configuration, not only the shaft support of the main body of the belt fastening unit with respect to the upper end portion of the second hook can be easily and stably performed, but also the belt can be easily and easily inserted below the first horizontal support shaft.

FIG. 1 is a side view showing a usage state of the scaffolding plate fixing device according to the first embodiment of the present invention. FIG. 2 is a vertical sectional side view showing a state before use of the scaffolding plate fixing device of the same as above, with a part of the belt omitted. FIG. 3 is a plan view showing a state before use of the scaffolding plate fixing device of the same as above, with a part of the belt omitted. FIG. 4 is a partial vertical sectional front view of the second hook and the belt fastening unit shown in FIG. FIG. 5 is an exploded perspective view of the belt fastening unit. FIG. 6 is a partial vertical sectional side view of the second hook and the belt fastening unit in a used state. FIG. 7 is a vertical sectional side view showing immediately before the disengagement operation of the engaging means in the belt fastening unit. FIG. 8 is a vertical sectional side view showing immediately after the disengagement operation of the engaging means in the belt fastening unit.

As shown in FIG. 1, the scaffolding plate fixing device according to the present invention is used for fixing the scaffolding plate 2 supported by the supporting steel pipe 1 to the supporting steel pipe 1, and is used for fixing the scaffolding plate 2 to the supporting steel pipe 1. One fastening belt having one end connected to the upper ends of the first hook 3, the second hook 4, the belt fastening unit 5, and the first hook 3 to be engaged with the supporting steel pipe 1 adjacent to both the left and right sides. It is equipped with 6.

Hereinafter, to be described in detail with reference to FIGS. 2 to 5, the first hook 3 is provided with an elongated hole 9 through which the fastening belt 6 is inserted into the upper end horizontal arm portion 8 of the hook-shaped substrate 7, and the upper end is horizontal. A spring material 10 for preventing the support steel pipe from coming off is attached to the free end of the arm portion 8, and a reinforcing rib 11 is formed on the hook-shaped substrate 7. The spring material 10 is the same as that described in Patent Document 1. One end of the fastening belt 6 is passed through the elongated hole 9 and folded back, and the double-layered portion 6a is integrated by sewing. As shown in FIGS. 2 and 4, in the second hook 4, both side plate portions 14a and 14b are bent and continuously provided on the same side from the left and right sides of the upper end portion extending upward of the hook-shaped substrate 12. It is formed in a U shape in a plan view, and the bottom plate portion (board 12) in the U-shaped upper end portion 13 is cut out in a rectangular shape from the upper end edge thereof, and a notch recessed portion 4a through which the fastening belt 6 is passed is passed. Is provided. Further, the both side plate portions 14a and 14b are oriented so as to project to the side opposite to the side with the scaffold plate 2 when the second hook 4 is fitted to the support steel pipe 1 from the same side as the first hook 3. It is formed. Of the side plate portions 14a and 14b of the U-shaped upper end portion 13 of the second hook 4, the side plate portion 14a on the side with the overhanging shoulder portion of the hook-shaped substrate 12 is a portion parallel to the other side plate portion 14b. It is bent from the shoulder and extends along the overhanging shoulder so that the height gradually decreases. Further, a reinforcing rib 15 is formed on the hook-shaped substrate 12.

As shown in FIGS. 2 to 5, the belt fastening unit 5 has a U-shaped main body 16 having an upper open cross section and a U-shaped cross section having a narrower width than the main body 16 and a lower open cross section. It is composed of the operation piece 17 and the engaging means 18. One ends of the left and right side plate portions 19a and 19b of the main body 16 extend outward from the bottom plate portion 19c to form a bearing portion 20, and the bearing portions 20 are both sides of the U-shaped upper end portion 13 of the second hook 4. The second hook is provided by the first horizontal support shaft 21 that penetrates the bearing portion 20 and the plate portions 14a and 14b on both sides of the U-shaped upper end portion 13 of the second hook 4 in a state of being fitted between the plate portions 14a and 14b. 4 and the main body 16 are axially supported and connected so as to be relatively swingable. The operation piece 17 has a tip bearing in a state where the tip bearing portions 23 of the left and right side plate portions 22a and 22b having one end extending long are fitted in a position near the free end between the left and right side plate portions 19a and 19b of the main body 16. The main body 16 and the operation piece 17 are axially supported and connected by a second horizontal bearing shaft 24 penetrating the portions 23 and the left and right side plate portions 19a and 19b of the main body 16. Therefore, when this scaffolding plate fixing device is not used, the operation piece 17 is swung around the second horizontal support shaft 24 to be fitted between the left and right side plate portions 19a and 19b of the main body 16 and the second hook. 4 can be swung around the first horizontal support shaft 21 so as to be overlapped with the outside of the bottom plate portion 19c of the main body 16, and the main body 16, the operation piece 17, and the second hook 4 can be overlapped with each other to be bulky. ..

The operation piece 17 has a top plate portion that connects and integrates the left and right side plate portions 22a and 22b, and is divided into two by a rectangular belt insertion opening 25 formed at an intermediate position in the length direction thereof. The top plate portion 22c on the side of the second horizontal support shaft 24 from the opening 25 is folded inward on the side side of the opening 25 to form the belt guide portion 26, and the operation piece 17 is formed from the opening 25. The top plate portion 22d on the free end side of the above is curved inward on the side side of the opening 25 side to form a spring receiving portion 27, and is notched in an arc shape from the free end of the top plate portion 22d. The operation opening 28 is provided. The engaging means 18 is provided inside the free end side top plate portion 22d provided with the spring receiving portion 27 and the operation opening 28, and is a second horizontal support so as to be fitted in the main body 16. The operation piece 17 lying down around the shaft 24 and the main body 16 are automatically engaged with each other.

The engaging means 18 is composed of an engaging body 29, a urging spring 30, and an engaging portion 31 formed on the upper side of the left and right side plate portions 19a and 19b of the main body 16. The engaging body 29 is composed of a U-turn plate portion 29c that connects and integrates the lower plate portion 29a and the upper plate portion 29b, and the lower plate portion 29a and the upper plate portion 29b on the free end side of the operation piece 17. It is a character shape, and from the left and right sides of the lower plate portion 29a, elongated holes 32a, 32b provided in the left and right side plate portions 22a, 22b of the operation piece 17 along the length direction of the operation piece 17. A pair of left and right engaging plate portions 33a, 33b projecting to the outside of the left and right side plate portions 22a, 22b via a predetermined length are provided. Therefore, the engaging body 29 is supported so as to be reciprocating within a certain range in the length direction of the operation piece 17 by engaging the pair of left and right engaging plate portions 33a, 33b and the elongated holes 32a, 32b. ..

The urging spring 30 is formed by bending one spring steel wire rod, and the linear wire rod portions 30a and 30b parallel to each other at both ends and the both linear wire rod portions 30a and 30b are mutually parallel. It is composed of an S-shaped wire rod portion 30c that connects and integrates the ends located on the opposite sides. One linear wire rod portion 30a of the urging spring 30 is fitted in the spring receiving portion 27 of the top plate portion 22d of the operation piece 17, and the other linear wire rod portion 30b is a U-turn of the engaging body 29. The engaging body 29 is moved to the free end side of the operation piece 17 by the elastic return force of the S-shaped wire rod portion 30c that acts in the direction of separating the two linear wire rod portions 30a and 30b from each other by fitting in the plate portion 29c. Pressing and encouraging. Therefore, as shown in FIG. 4, the engaging body 29 is held at the retracted limit position where the pair of left and right engaging plate portions 33a and 33b abut on the outer ends of the elongated holes 32a and 32b on the operation piece 17 side.

As shown in FIGS. 2 and 6, the engaging portion 31 on the main body 16 side is used for urging when the operation piece 17 is rotated around the second horizontal support shaft 24 and fitted into the main body 16. The engaging body 29 held in the retracted limit position by the spring 30 is passed through the pair of left and right engaging plate portions 33a and 33b thereof, and the second horizontal support shaft 24 is opposed to the urging force of the urging spring 30. The cam plate portion 31a that is moved forward to a certain side and the engaging plate portions 33a and 33b that are detached from the cam plate portion 31a are received and reciprocally movable in the length direction of the main body 16 and are received on the lower side of the cam plate portion 31a. It is composed of a horizontal guide surface 31b for guiding to. Therefore, when the operation piece 17 is rotated around the second horizontal support shaft 24 and fitted into the main body 16, the engaging body 29 (engaging plate portions 33a, 33b) is formed by the cam plate portion 31a of the engaging portion 31. However, the engaging body 29 (engagement plate portions 33a, 33b) moves forward from the retracting limit position once against the urging force of the urging spring 30, and then moves forward again to the retracting limit position by the urging force of the urging spring 30. By moving backward, the pair of left and right engaging plate portions 33a and 33b of the engaging body 29 enter the lower side of the cam plate portion 31a of the engaging portion 31, and the engaging body 29 moves upward from the engaging portion 31. Since the movement is prevented, the operation piece 17 is automatically held in the storage position fitted in the main body 16.

As described above, the operation piece 17 automatically held in the storage position fitted in the main body 16 by the action of the engaging body 29, the engaging portion 31, and the urging spring 30 is held by the second horizontal support shaft 24. When the engaging body 29 in the retracting limit position is moved forward against the urging force of the urging spring 30, when the engaging body 29 is opened around the main body 16 to stand up from the inside of the main body 16, a pair of left and right engaging plates of the engaging body 29 is moved forward. The portions 33a and 33b may be removed forward from the cam plate portion 31a of the engaging portion 31, but the free end side top plate of the operation piece 17 can be easily performed by using a rod-shaped tool such as a shino. In addition to the operating opening 28 formed in the portion 22d, the engaging body 29 is provided with an operating hole 34. The operation hole 34 is provided at the center position in the left-right width direction of the engaging body 29, but does not penetrate the entire engaging body 29 in the vertical direction, and is a U-turn plate from the upper plate portion 29b. It is provided over the upper half of the portion 29c, and the lower side of the entire operation hole 34 is closed by the upper surface of the lower plate portion 29a extending to the outer peripheral surface of the U-turn plate portion 29c. Therefore, as shown in FIGS. 7 and 8, the tapered tip portion 35a of the rod-shaped tool 35 such as Shino is passed through the operation opening 28 formed in the free end side top plate portion 22d of the operation piece 17. By inserting it into the operation hole 34 of the lower engaging body 29 and pressing and moving the rod-shaped tool 35 forward in this state, the engaging body 29 is moved forward against the urging force of the urging spring 30. The engaging plate portions 33a and 33b of the engaging body 29 can be detached forward from the lower side of the cam plate portion 31a of the engaging portion 31, and the operation piece 17 can be opened upward from the main body 16.

As shown in FIG. 1, the scaffolding plate 2 is placed on the supporting steel pipe 1 suspended horizontally at predetermined intervals in the length direction of the scaffolding plate. The scaffolding plate 2 has a required width by placing a plurality of scaffolding plate single units 2a in parallel in the length direction of the supporting steel pipe 1. In order to fix the scaffolding plate 2 to the supporting steel pipe 1, the scaffolding plate fixing device having the above configuration is used. First, the first hook 3 is adjacent to one of the left and right sides of the scaffolding plate 2. And engage with the supporting steel pipe 1. Since the spring material 10 for preventing disengagement is attached to the first hook 3, the first hook 3 supports the first hook 3 even if the first hook 3 engaged with the supporting steel pipe 1 is not held by hand. It will not come off unexpectedly from the steel pipe 1.

Next, the fastening belt 6 is pulled in the transverse direction on the upper side of the scaffold plate 2, and as shown in FIG. 2, the fastening belt 6 is passed through the notch recessed portion 4a at the upper end of the second hook 4. From the lower side of the first horizontal support shaft 21 connecting the second hook 4 and the main body 16, the upper side of the bottom plate portion 19c of the main body 16 is inserted, and further, the fastening belt 6 is inserted into the main body 16 and the operation piece. It is inserted into the belt insertion opening 25 from the outside of the belt guide portion 26 of the operation piece 17 via between the second horizontal support shaft 24 connecting the 17 and the bottom plate portion 19c, and finally for the fastening. The belt 6 is pulled out to the back side of the operation piece 17 via the space between the second horizontal support shaft 24 and the fastening belt 6 located outside the second horizontal support shaft 24.

When the belt fastening unit 5 is attached to the fastening belt 6 as described above, the second hook 4 connected to the belt fastening unit 5 via the first horizontal support shaft 21 is attached to both the left and right sides of the scaffolding plate 2. It is adjacent to the other side of the side and is engaged with the supporting steel pipe 1 from the same side as the first hook 3. In such a state, the free end side of the fastening belt 6 pulled out to the back side of the operation piece 17 of the belt fastening unit 5 is pulled to tension the fastening belt 6 on the scaffolding plate 2. In order to reduce the tensile resistance of 6, the operation piece 17 shown in the posture of standing up from the main body 16 is rotated around the second horizontal support shaft 24 to the outside of the main body 16 as shown in FIG. By changing to a posture extending almost horizontally from the main body 16, the tensile resistance of the fastening belt 6 is set along the folded side of the belt guide portion 26 of the operation piece 17 on the belt insertion opening 25 side. It only resists when making a U-turn and can be easily pulled.

If the fastening belt 6 on the scaffolding plate 2 is tensioned by the above operation and the first hook 3 and the second hook 4 are in close contact with both the left and right sides of the scaffolding plate 2, the tensioning state of the fastening belt 6 is released. While maintaining the operation piece 17, the operation piece 17 is rotated and erected around the second horizontal support shaft 24, and the fastening belt 6 pulled out from the back side of the operation piece 17 is pulled out from the belt insertion opening 25 of the operation piece 17. The operation piece 17 is pulled out to the outside, and the operation piece 17 is rotated and stored in the main body 16 around the second horizontal support shaft 24. As a result, as shown in FIG. 6, the operation piece 17 is automatically engaged with the main body 16 by the action of the engaging means 18, and is held in a state of being inverted and stored in the main body 16. If the belt insertion opening 36 is provided at the free end portion of the bottom plate portion 19c of the main body 16 so as to be visible outside the second horizontal support shaft 24 in a plan view, it is pulled out to the upper side of the operation piece 17. The free end side of the fastening belt 6 can be pulled out from the belt insertion opening 36 to the lower side of the main body 16 via the outside of the second horizontal support shaft 24. As shown in FIG. 1, the belt fastening unit 5 of the scaffolding plate fixing device used in this way is rotated slightly downward around the first horizontal support shaft 21 by the gravity acting on the belt fastening unit 5, and the main body 16 The free end portion is in a state of being supported on the supporting steel pipe 1. Then, as described above, the tension state of the fastening belt 6 along the scaffolding plate 2 between the first hook 3 and the second hook 4 is the folded state shown in FIG. 6, that is, the belt guide portion 26. As it is folded back, it is securely held by the large resistance caused by the folded state in which it makes a U-turn in an overlapping state in which the loosening directions are opposite to each other around the second horizontal support shaft 24, and the fastening belt 6 naturally loosens. It never ends up.

When the scaffolding plate 2 is disassembled and removed, the engaging body 29 of the engaging means 18 is moved in the forward direction from the retracting limit position against the urging force of the urging spring 30 by the method described above, and the main body is used. The engaging plate portions 33a and 33b of the engaging body 29 are removed from the engaging portion 31 on the 16 side, the operating piece 17 is opened from the main body 16 around the second horizontal support shaft 24, and the operating piece 17 extends in the extension direction of the main body 16. By changing the posture to extend to, the tensioned fastening belt 6 is loosened, so the fastening belt 6 is pulled from the second hook 4 to the side where the first hook 3 is located, and the fastening action is applied to the scaffolding plate 2. Can be canceled.

The scaffolding plate fixing device of the present invention can be utilized as a means for fixing the scaffolding plate to the supporting steel pipe, for example, when assembling a temporary work scaffolding under a bridge.

1 Supporting steel pipe 2 Scaffolding plate 3 1st hook 4 2nd hook 4a Notched recess 5 Belt fastening unit 6 Fastening belt 6a Double-layered part 7, 12 Hook-shaped board 8 Upper end horizontal arm 9 Long hole 10 Spring Material 11, 15 Reinforcing rib 13 U-shaped upper end of the second hook 14a, 14b Side plate 16 Main body (belt fastening unit)
17 Operation piece (belt fastening unit)
18 Engagement means (belt fastening unit)
19a, 19b Left and right side plate parts of the main body 19c Bottom plate part of the main body 20 Bearing part 21 First horizontal support shaft 22a, 22b Left and right side plate parts of the operation piece 22c, 22d Top plate part of the operation piece 23 Tip bearing part 24 Second horizontal Support shaft 25, 36 Belt insertion opening 26 Belt guide part 27 Spring receiving part 28 Operation opening 29 Engagement body 29a Lower plate part 29b Upper plate part 29c U-turn plate part 30 Bounce spring 30a, 30b Straight wire Part 30c S-shaped wire part 31 Engagement part 31a Cam plate part 31b Horizontal guide surface 32a, 32b Long hole 33a, 33b Engagement plate part 34 Operation hole 35 Rod-shaped tool such as Shino 35a Tapered tip part

Claims (3)

It is equipped with a first hook and a second hook to engage with a supporting steel pipe, a belt fastening unit, and one fastening belt having one end connected to the upper end of the first hook, and the belt fastening unit is the upper end of the second hook. One end of the main body is undulatingly connected by the first horizontal support shaft and extends to the side opposite to the side with the scaffold plate with respect to the second hook, and the other end of this main body is connected by the second horizontal support shaft. The operation piece is provided with an operation piece that is undulatingly connected to the shaft, and an engagement means that can be freely engaged and disengaged so that the operation piece and the main body are automatically engaged when the operation piece is laid down so as to overlap the main body. Is provided with an opening for inserting the fastening belt in the vertical direction at an intermediate position between both ends, and the first hook and the second hook are adjacent to both sides of the scaffold plate supported on the supporting steel pipe. The fastening belt that is engaged with the supporting steel pipe and extends from the first hook is passed over the scaffold plate, and then the lower side of the first horizontal support shaft of the second hook, the lower side of the second horizontal support shaft, And, while being guided to the back side of the operation piece via the opening of the operation piece in this order, the fastening belt located below the second horizontal support shaft and the second horizontal support shaft are reversed in the opposite direction. The operation piece was passed and engaged with the main body by the engaging means in a state of being overlapped on the main body, and the entire belt fastening unit was configured to protrude to the outside of one side of the scaffold plate. Scaffold plate fixing device. An opening for inserting the fastening belt in the vertical direction is provided at the end of the main body on the second horizontal support shaft side, and the free end of the fastening belt is inserted in the opposite direction through the opening on one side of the operation. The scaffolding plate fixing device according to claim 1, wherein the scaffolding plate fixing device is configured so as to be guided to the outside of the operation piece and then pulled out to the lower side of the main body via the opening on the main body side. The upper end portion of the second hook is formed in a U-shape in a plan view with the left and right side plate portions protruding outward from the substrate, and the left and right side plate portions of the main body are the first horizontal support at the U-shaped upper end portion. The bottom plate portion at the U-shaped upper end of the second hook is provided with a notch formed from the upper end edge of the second hook, which is undulating and undulatingly connected by a shaft. The scaffolding plate fixing device according to claim 1 or 2, wherein is inserted under the first horizontal support shaft.

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