Jack fall prevention tool and jack fall prevention unit

Abstract

To provide a jack fall prevention tool and a jack fall prevention unit devised to facilitate mounting work.SOLUTION: In a jack fall prevention tool 2 for preventing the fall of a jack 4 having a screw rod 42 and an adjusting nut 41 screwed to the screw rod 42 attached to the lower end of a strut 9 for constructing a wedge-tied type gantry 9, an attachment metal fitting 21 attached to a wedge mounting part 311 provided on an attachment member 3 by a wedge material K, a support part 23 arranged below the adjusting nut 41 of the jack 4, and a connection part 22 for connecting the attachment metal fitting 21 and the support part 23 are provided.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a jack fall prevention device and a jack fall prevention unit that prevent jacks used on temporary structures such as platforms and scaffolding from falling. [Background technology]

[0002] At civil engineering and construction sites, temporary structures such as gantry platforms and scaffolding are installed to set up work machines and perform work at height. A gantry platform or the like has a jack attached to the bottom of its support pillar, which has a threaded rod and an adjustment nut that screws onto the threaded rod. The height and level of the support pillar can be adjusted by adjusting the position of the adjustment nut.

[0003] At civil engineering construction sites, assembled platforms with jacks attached may be lifted and moved using a crane or similar device. Because the jacks are simply threaded into the lower ends of the support posts, there is a risk that the jacks may fall when lifted by a crane or similar device. For this reason, a common solution is to secure the jacks to the support posts by wrapping wire around them.

[0004] However, the task of securing the jack to the support by wrapping the wire around it is cumbersome and highly dependent on the worker. In some cases, the wire may not be wrapped properly, causing the jack to fall. Falling the jack is not only dangerous, but it can also be extremely difficult to reattach it to the support. For this reason, various fall prevention devices have been proposed to prevent the jack from falling, instead of wrapping the wire around it (see, for example, Patent Document 1 and Patent Document 2).

[0005] The jack fall prevention device described in Patent Document 1 includes a clamp part that clamps the support pole and a J-shaped hook part attached to the clamp part. The hook part is hooked onto one of a pair of handles attached to the jack's adjustment nut to prevent the jack from falling.

[0006] Furthermore, the jack fall prevention device described in Patent Document 2 includes a clamp part that clamps a support pole and a bent metal wire body attached to the clamp part. The bent metal wire body has a pair of suspending parts that suspend a pair of handles attached to the jack's adjustment nut, thereby preventing the jack from falling. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2023-035207 [Patent Document 2] Japanese Patent Publication No. 2022-012213 Summary of the Invention [Problem to be solved by the invention]

[0008] However, both the jack fall prevention device described in Patent Document 1 and Patent Document 2 are hooked onto or suspended from the jack handle. This means that the jack fall prevention device must be set in the correct orientation for the handle and then the clamp must be fastened in that state. This can make installation difficult, especially when there is insufficient working space.

[0009] In view of the above circumstances, an object of the present invention is to provide a jack fall prevention device and a jack fall prevention unit that are designed to facilitate installation work. [Means for solving the problem]

[0010] The jack fall prevention device of the present invention, which solves the above-mentioned object, is a jack fall prevention device that is attached to the lower end of a support that constructs a wedge-tightening temporary structure, and that prevents the fall of a jack that has a threaded rod and an adjusting nut that screws onto the threaded rod, a mounting bracket attached to a wedge mounting portion provided on the support pillar by a wedge member; a support portion disposed below the adjusting nut on the jack; a connecting portion that connects the mounting fixture and the support portion, The support portion is characterized in that it contacts the lower end of the adjusting nut and supports the jack.

[0011] Here, the term "temporary structure" refers to a temporary structure such as a platform or scaffolding. The jack to which the present invention is applied is not particularly limited as long as it is a rod jack having a threaded rod and an adjusting nut that threads onto the threaded rod. For example, the jack may have a base plate fixed to the bottom end of the threaded rod, or may be a so-called swivel jack in which the base plate is attached so as to be freely rotatable. It may also be a jack with casters attached to the bottom end of the threaded rod, as described in Patent Document 2.

[0012] Furthermore, when the mounting bracket is attached to the wedge mounting portion, the support portion may be in contact with the lower end of the adjusting nut. Also, the support portion may have a predetermined distance from the lower end of the adjusting nut, and when the temporary object is lifted, the support portion may come into contact with the lower end of the adjusting nut to support the jack and prevent the jack from falling.

[0013] According to the jack fall prevention device of the present invention, the support portion disposed below the adjusting nut contacts the lower end of the adjusting nut to support the jack, rather than being hooked onto or suspended from the jack handle as in the jack fall prevention devices described in Patent Documents 1 and 2. This allows installation regardless of the orientation of the adjusting nut handle. Furthermore, installation is easy, as the mounting bracket is simply attached to the wedge mounting portion using the wedge member.

[0014] In the jack fall prevention device of the present invention, the connecting portion may be disposed in a position where it does not come into contact with the handle of the adjusting nut when the adjusting nut of the jack is rotated.

[0015] With the jack fall prevention devices described in Patent Documents 1 and 2, if it becomes necessary to adjust the jack, the jack fall prevention device must be removed, the adjustment nut must be rotated to make the adjustment, and then the jack fall prevention device must be reattached.

[0016] In contrast, if the connecting portion is positioned in a position where it does not come into contact with the handle of the adjusting nut, the adjusting nut can be rotated to adjust the jack without removing the jack fall prevention device.

[0017] Furthermore, in the jack fall prevention device of the present invention, it is preferable that the support portion is a plate-like member having a notch into which the threaded rod of the jack is inserted.

[0018] Here, the support portion may be a U-shaped plate having the notch portion in a plan view.

[0019] By adopting this aspect, the adjusting nut can be supported on both sides of the threaded rod in the support portion, making it possible to more stably prevent the jack from falling.

[0020] Furthermore, in the jack fall prevention device of the present invention, the connecting portion may have a length adjustment means for adjusting the length, and the length adjustment means may be capable of adjusting the distance between the mounting bracket and the support portion.

[0021] This makes it easy to accommodate differences in the distance between the wedge mounting portion to which the mounting bracket is attached and the lower end of the adjusting nut.

[0022] The jack fall prevention unit of the present invention, which solves the above-mentioned object, is used for a support for constructing a temporary structure, and is a jack fall prevention unit that prevents the fall of a jack having a threaded rod and an adjusting nut that screws onto the threaded rod, The device includes an attachment member disposed at the lower end portion of the support pole, and a jack fall prevention device attached to the attachment member, The attachment member has a wedge mounting portion into which a wedge member is inserted, and is a pipe-shaped member into which the threaded rod of the jack is inserted from below, The jack fall prevention device is a mounting bracket attached to the wedge mounting portion by the wedge member; a support portion disposed below the adjusting nut on the jack; a connecting portion that connects the mounting fixture and the support portion, The support portion is characterized in that it contacts the lower end of the adjusting nut and supports the jack.

[0023] Here, the temporary structure may be a wedge-tightened platform or scaffolding, or a frame scaffolding assembled around a building frame using joints and wires while adding jacks and diagonal braces. The attachment member may have a configuration similar to that of the support column, with the wedge mounting portions provided at 90-degree intervals in a plan view on the outer periphery of a pipe-shaped main body, or may have one wedge mounting portion provided at a predetermined location on the outer periphery. The wedge mounting portion may be fixed to the pipe-shaped main body, or may be detachably attached to the pipe-shaped main body. Furthermore, the wedge mounting portion may be movable in the circumferential direction or up and down relative to the pipe-shaped main body.

[0024] According to the jack fall prevention unit of the present invention, in addition to the effects of the jack fall prevention device described above, the attachment member and the jack fall prevention device are configured as a set, making it easier to adjust the support part to be positioned below the adjustment nut. [Effects of the Invention]

[0025] According to the present invention, it is possible to provide a jack fall prevention device and a jack fall prevention unit that are designed to facilitate installation work. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a diagram showing a wedge-tightening type gantry to which the jack fall prevention device and jack fall prevention unit of the present invention are applied. [Figure 2] 2 is an enlarged view of a portion A enclosed in a circle in FIG. 1. FIG. [Figure 3] 3 is an exploded perspective view showing the attached state of the jack fall prevention unit in FIG. 2.

[0023] FIG. [Figure 4] FIG. 3 is a perspective view of FIG. 2. [Figure 5] 5 is a view corresponding to FIG. 4 and showing a modified example of a jack fall prevention device. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this embodiment, an example will be described in which a wedge-tightening gantry is used as a temporary structure. Note that the jack fall prevention device and jack fall prevention unit of the present invention can be applied not only to gantry structures but also to temporary structures such as scaffolding where a jack is attached to the bottom end of a support.

[0028] FIG. 1 is a diagram showing a wedge-tightening type gantry 9 to which a jack fall prevention device 2 and a jack fall prevention unit 10 of the present invention are applied.

[0029] As shown in Fig. 1, a gantry 9 installed at a civil engineering construction site or the like has a plurality of support columns 91 erected at intervals in the left-right and front-back directions (directions perpendicular to the plane of the page), horizontal members 92 connecting adjacent support columns 91, and brace members 93 connecting predetermined horizontal members 92 together. Wedge mounting portions 911 are provided on the support columns 91 at intervals in the height direction, and wedge members K are inserted into these wedge mounting portions 911 to connect the support columns 91 and the horizontal members 92. The support columns 91 are configured by connecting the members that make up the support columns 91 in the height direction.

[0030] Additionally, beam supports 99 are attached to the upper ends of the support posts 91. Between adjacent beam supports 99, beams 94 extending in the front-to-rear direction are suspended while being supported by the beam supports 99. Joists 95 are placed on the beams 94 at predetermined intervals (for example, 300 mm to 350 mm) in the direction in which they extend (front-to-rear direction), and floor panels 96 that form the floor surface are installed on the beams 94 and joists 95. Furthermore, handrail posts 97 are erected at the upper ends of the support posts 91 on both the left and right sides of the floor panels 96, and handrails 98 are attached to these handrail posts 97.

[0031] The lower end portion of the support pillar 91 is provided with an attachment member 3, a jack 4 attached to the attachment member 3, and a jack fall prevention device 2 that prevents the jack 4 from falling. The jack fall prevention unit 10 of the present invention is made up of the attachment member 3 and the jack fall prevention device 2, but the attachment member 3 in this embodiment is a member that constitutes the lower end portion of the support pillar 91, that is, it also serves as a member that constitutes the lower end portion of the support pillar 91.

[0032] Fig. 2 is an enlarged view of the circled portion A in Fig. 1. Note that Fig. 2 omits the support pillar 91 connected to the upper side of the attachment member 3, and shows the jack fall prevention unit 10 consisting of the jack fall prevention tool 2 and the attachment member 3, the jack 4, and the base plate 44. Fig. 3 is an exploded perspective view showing the attached state of the jack fall prevention unit 10 in Fig. 2, and Fig. 4 is a perspective view of Fig. 2.

[0033] 2 to 4, the attachment member 3 has a round pipe-shaped main body 31, a wedge mounting portion 311 that is U-shaped in plan view and provided on the outer periphery of the main body 31, and a pillar connecting portion 32 that is provided on the upper end of the main body 31 and has a smaller diameter than the main body 31. As described above, the attachment member 3 of this embodiment is a member that constitutes part of the support pillar 91 (see FIG. 1), and has the same configuration as the other members that constitute the support pillar 91. Specifically, the attachment member 3 of this embodiment has four wedge mounting portions 311 that are provided on the main body 31 at 90-degree intervals in plan view. The pillar connecting portion 32 is a portion that is arranged on the upper side and is connected to a member that constitutes the support pillar 91.

[0034] The jack 4 of this embodiment includes a base plate 43 fixed to a base plate 44 with fixing members such as screws and bolts, a threaded rod 42 extending from the base plate 43, and an adjusting nut 41 threadedly engaged with the threaded rod 42. The adjusting nut 41 has a disk-shaped adjusting nut body 411 and a pair of handles 412, 412 protruding outward from the adjusting nut body 411. The attachment member 3 has a cylindrical main body 31 into which the threaded rod 42 is inserted from below, and the lower end of the main body 31 is supported by the upper end of the adjusting nut body 411. This also supports a support column 91 disposed above the attachment member 3. The height and level of the support column 91 can be adjusted by rotating the adjusting nut 41 and adjusting the adjusting nut 41 in the vertical direction relative to the threaded rod 42. In this embodiment, a base plate 43 is fixed to the lower end of the threaded rod 42, but a swivel jack in which the base plate 43 is attached to the threaded rod 42 so that it can rotate freely may also be used, or a caster may be provided at the lower end of the threaded rod 42.

[0035] The jack fall prevention device 2 of the present invention comprises a mounting bracket 21 attached to a wedge mounting portion 311 provided on the attachment member 3 (pillar 91) by a wedge material K, a support portion 23 positioned below the adjustment nut 41 on the jack 4, and a connecting portion 22 connecting the mounting bracket 21 and the support portion 23.

[0036] The mounting bracket 21 has a configuration similar to that of the brackets provided at both ends of the horizontal member 92 of the gantry 9 shown in Fig. 1. Specifically, it is roughly U-shaped in side view as shown in Fig. 2, and is made up of an upper horizontal section 211, a lower horizontal section 213, and a vertical section 212 connecting the upper horizontal section 211 and the lower horizontal section 213, and further has a hanging section 2111 bent downward at the tip of the upper horizontal section 211. Also, as shown in Fig. 3, an upper insertion opening 211a is formed in the upper horizontal section 211, through which the wedge member K is inserted, and a lower insertion opening 213a is also formed in the lower horizontal section 213, through which the wedge member K is inserted.

[0037] 2 and 4, the mounting bracket 21 is placed laterally over the wedge mounting portion 311, with the hanging portion 2111 engaging the upper end of the wedge mounting portion 311 and the tip of the lower horizontal portion 213 abutting against the main body 31 of the attachment member 3. In this state, the wedge material K is inserted through the upper insertion opening 211a, the wedge mounting portion 311 and the lower insertion opening 213a, thereby attaching the mounting bracket 21 to the attachment member 3.

[0038] 3, the support portion 23 is plate-shaped and has a notch 23a into which the threaded rod 42 is inserted. By providing the notch 23a in the support portion 23, the adjusting nut 41 can be supported on both sides of the threaded rod 42, making it possible to more stably prevent the jack 4 from falling. Note that the notch 23a in the support portion 23 in this embodiment is formed in a rectangular shape, but it may also be formed in an arc shape to match the shape of the threaded rod 42, or only the back side (bottom side) may be formed in an arc shape.

[0039] In this embodiment, connecting portion 22 is in the shape of a round bar and is fixed to mounting bracket 21 and support portion 23 by welding or the like, thereby connecting mounting bracket 21 and support portion 23 at a predetermined distance. As described above, this predetermined distance is set to a length that will result in support portion 23 being positioned below adjusting nut 41 when mounting bracket 21 is attached to wedge mounting portion 311, as shown in Figures 2 and 4. Note that although Figures 2 and 4 show the upper surface of support portion 23 in contact or nearly in contact with the lower surface of adjusting nut 41, there may be some gap between the upper surface of support portion 23 and the lower surface of adjusting nut 41.

[0040] 2 and 4, in this embodiment, the connecting portion 22 is arranged to be positioned so as not to come into contact with the handle 412 of the adjusting nut 41 when the adjusting nut 41 of the jack 4 is rotated. This makes it possible to rotate the adjusting nut 41 and adjust the jack 4 without removing the jack fall prevention device 2.

[0041] To attach the jack fall prevention device 2 to the attachment member 3, from the state shown in Fig. 3, as shown in Figs. 2 and 4, the mounting bracket 21 is placed over the wedge mounting portion 311 from the side, the hanging portion 2111 is engaged with the upper end of the wedge mounting portion 311, and the tip of the lower horizontal portion 213 is brought into contact with the main body 31 of the attachment member 3. The threaded rod 42 is also inserted into the notch 23a of the support portion 23. In this state, the wedge K is inserted through the upper insertion opening 211a, the wedge mounting portion 311, and the lower insertion opening 213a, thereby attaching the jack fall prevention device 2 to the attachment member 3. In this embodiment, an example has been described in which the jack fall prevention device 2 is attached using the wedge mounting portion 311 on the right side in Fig. 2 (the wedge mounting portion 311 diagonally downward to the right in Figs. 3 and 4), but as mentioned above, the attachment member 3 is provided with four wedge mounting portions 311 spaced at 90-degree intervals in a plan view. Therefore, the jack fall prevention device 2 can be attached by selecting an appropriate wedge mounting portion 311 depending on the orientation of the handle 412 of the adjustment nut 41, the conditions of the installation location, etc.

[0042] As described above, the jack fall prevention device 2 of the present invention is not hooked onto or suspended from the handle 412 of the jack 4, so it can be installed regardless of the orientation of the handle 412 of the adjusting nut 41, and can be attached with extremely easy work. As a result, even if the gantry 9 shown in Fig. 1 with the jack 4 attached is lifted and moved by a crane or the like, the support part 23 comes into contact with the lower end of the adjusting nut 41, supporting the jack 4 and preventing the jack 4 from falling.

[0043] Next, modified examples of the jack fall prevention device 2 shown in Figures 2 to 4 will be described. In the modified examples described below, differences from the embodiment shown in Figures 2 to 4 will be mainly described, and components with the same names as those in the embodiment shown in Figures 2 to 4 will be described using the same reference numerals as used above, and duplicated descriptions may be omitted.

[0044] FIG. 5 is a view corresponding to FIG. 4, showing a modified jack fall prevention device 2'.

[0045] As shown in Fig. 5, a modified jack fall prevention device 2' employs a configuration in which the mounting bracket 21 and the support part 23 are connected by a pair of connecting parts 22', 22' arranged at a distance from each other on the left and right. With this jack fall prevention device 2', for example, when the handle 412 of the adjusting nut 41 is long, it is possible to pass the handle 412 between the pair of connecting parts 22', 22'.

[0046] According to the present invention, it is possible to provide a jack fall prevention device and a jack fall prevention unit that are designed to facilitate installation work.

[0047] The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, in the above-described embodiment, an attachment member 3 having four wedge mounting portions 311 and a configuration similar to that of the other members constituting the support pole 91 is used, but an attachment member 3 having a configuration different from that of the other members constituting the support pole 91, for example, one specific wedge mounting portion 311, may also be used. Furthermore, an embodiment may be adopted in which the wedge mounting portion 311 is detachable from the main body 31, and multiple mounting portions are provided in the circumferential and height directions of the main body 31, and the wedge mounting portion 311 is attached to an appropriate mounting portion.

[0048] Furthermore, connecting portions 22, 22' may have a length adjustment means for adjusting the length, such as an up / down sliding type or a two-part, upper and lower type. By adopting this mode, the distance between mounting bracket 21 and support portion 23 can be adjusted, making it easy to accommodate differences in the distance between wedge mounting portion 311, to which mounting bracket 21 is attached, and the lower end of adjustment nut 41.

[0049] Furthermore, in the above-described embodiment, an example was shown in which the device was used on a wedge-tightening type gantry 9, but it may also be used on wedge-tightening type scaffolding, or by providing attachment members 3 specifically for the jack fall prevention devices 2, 2', it may also be used on frame scaffolding, etc., which is assembled around a building frame with jacks and braces added, and joints and wires. Furthermore, in the above-described embodiment, the jack fall prevention devices 2, 2' have been described as an example of an integrated structure in which the mounting brackets 21, connecting portions 22, 22', and supporting portions 23 are fixed by welding or the like, but all or part of the mounting brackets 21, connecting portions 22, 22', and supporting portions 23 may also be formed separately and used by assembling. [Explanation of symbols]

[0050] 10 Jack fall prevention unit 2. Jack fall prevention device 21 Mounting bracket 22,22' Connection 23 Support part 23a Notch 3 Attachment parts 31 Main Unit 311 Wedge mounting part 33 Engaged part 4 Jack 41 Adjustment nut 411 Adjustment nut body 42 Threaded Rod 9 Platform 91 Post K wedge material

Claims

1. A jack fall prevention device that prevents a jack from falling and has a threaded rod and an adjusting nut that screws onto the threaded rod, and is attached to the lower end of a support that constructs a wedge-tight temporary structure. a mounting bracket attached to a wedge mounting portion provided on the support pillar by a wedge member; a support portion disposed below the adjusting nut on the jack; a connecting portion that connects the mounting fixture and the support portion, The support portion contacts the lower end of the adjusting nut to support the jack.

2. 2. The jack fall prevention device according to claim 1, wherein the connecting portion is disposed at a position where it does not come into contact with a handle of the adjusting nut when the adjusting nut of the jack is rotated.

3. 3. A jack fall prevention device according to claim 1, wherein the support portion is a plate-like member having a notch into which the threaded rod of the jack is inserted.

4. 3. A jack fall prevention device according to claim 1 or 2, characterized in that the connecting portion has a length adjustment means for adjusting the length, and the length adjustment means makes it possible to adjust the distance between the mounting bracket and the support portion.

5. A jack fall prevention unit is used for a support for constructing a temporary structure, and prevents a jack having a threaded rod and an adjusting nut that is screwed onto the threaded rod from falling. The device includes an attachment member disposed at the lower end portion of the support pole, and a jack fall prevention device attached to the attachment member, The attachment member has a wedge mounting portion into which a wedge member is inserted, and is a pipe-shaped member into which the threaded rod of the jack is inserted from below, The jack fall prevention device is a mounting bracket attached to the wedge mounting portion by the wedge member; a support portion disposed below the adjusting nut on the jack; a connecting portion that connects the mounting fixture and the support portion, The jack fall prevention unit is characterized in that the support portion contacts the lower end of the adjusting nut to support the jack.

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