Fall prevention device

Abstract

To provide a fall prevention device capable of minimizing the time for the opening / closing operation of a receiving material.SOLUTION: A fall prevention device 100 comprises a receiving material 10 having a base end supported rotatably around a horizontal shaft 62 at a lateral wall side of a building and capable of receiving a falling object from above, a wire 30 having one end fixed to a tip of the receiving material 10, an orientation change mechanism 40 provided at the lateral wall side of the building above the horizontal shaft 62 and changing the orientation of the wire 30 extending from the tip of the receiving material 10 upward and a pull-up machine 50 which is provided at the lateral wall side of the building above the orientation change mechanism 40, to which the other end of the wire 40 is fixed and which can pull up or deliver the wire 30.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a fall prevention device, and more particularly to a fall prevention device that catches falling objects such as building materials and tools and prevents them from falling to the ground. [Background technology]

[0002] During construction or renovation work on buildings such as high-rise buildings, there is a risk that building materials, tools, etc. may fall to the ground. For this reason, fall prevention devices that catch falling objects with receiving materials (curing panels in Patent Document 1, eaves in Patent Document 1) have traditionally been installed on temporary scaffolding and the like. Since receiving materials get in the way when lifting building materials using a crane or the like, the receiving materials are made foldable (openable and closable) (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 62-244976 [Patent Document 2] Japanese Patent Application Publication No. 2-72748 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional fall prevention devices such as those described in Patent Documents 1 and 2, the receiving material is closed by the worker manually pulling up a rope attached to the tip of the receiving material. The receiving material is heavy because it is strong and designed to reliably catch falling objects such as building materials and tools, and it is necessary to open and close the receiving material every time a building material is lifted using a crane or the like, which takes a long time to open and close.

[0005] In view of the above, an object of the present invention is to provide a fall prevention device that can shorten the time required to open and close a receiving material. [Means for solving the problem]

[0006] The fall prevention device of the present invention is characterized by comprising a receiving material whose base end is supported on the side wall of a building so as to be freely rotatable around a horizontal axis and capable of receiving objects falling from above, a string-like body whose one end is fixed to the tip of the receiving material, a turning mechanism which is provided on the side wall of the building above the horizontal axis and which changes the direction of the string-like body extending from the tip of the receiving material so that it faces upward, and a lifting machine which is provided on the side wall of the building above the turning mechanism and to which the other end of the string-like body is fixed and which is capable of lifting and unwinding the string-like body.

[0007] According to the fall prevention device of the present invention, the pulling and unwinding of the cord-like body is performed electrically or hydraulically using a pulling machine, which makes it possible to easily open and close the receiving material compared to the conventional manual operation. In addition, since the direction of the cord-like body is changed so that it faces upward by the direction changing mechanism, the direction of the stress acting on the cord-like body from the pulling machine is constant, making it possible to pull up and unwind the cord-like body stably.

[0008] In the fall prevention device of the present invention, it is preferable that the distance between the horizontal axis and the deflection mechanism is longer than the distance between the horizontal axis and the tip end to which the string-like body of the receiving material is fixed.

[0009] In this case, it is possible to close the receiving material until it is approximately vertical, and when building materials or the like are lifted, it is possible to prevent these building materials from interfering with the receiving material.

[0010] In addition, in the fall prevention device of the present invention, it is preferable that the tip end of the receiving material to which the string-like body is fixed is located at the center of the receiving material in the left-right direction.

[0011] In this case, the receiving material can be opened and closed stably without shifting in the left-right direction.

[0012] In addition, in the fall prevention device of the present invention, it is preferable that the receiving material comprises a plurality of receiving material bodies, a plurality of outer frames each surrounding the outer periphery of the receiving material bodies, and a connecting body arranged between the plurality of outer frames and connecting to adjacent outer frames.

[0013] In this case, it is possible to connect multiple receiving material bodies via the outer frames connected by the connector. Also, by fixing one end of the string-like body to the tip of the connector, the stress acting on the receiving material from the string-like body can be received by the connector.

[0014] In addition, in the fall prevention device of the present invention, it is preferable that the deflection mechanism is a pulley and the string-like body is a wire.

[0015] In this case, it is possible to reduce the friction acting on the string-like body in the direction-changing mechanism.

[0016] In addition, in the fall prevention device of the present invention, it is preferable that the lifting device is a hoist or winch capable of winding and unwinding the string-like body, and is equipped with a stopper to prevent overwinding.

[0017] In this case, unlike a crane or the like that lifts and unwinds the string-like body by raising and lowering the other end of the string-like body, it is possible to easily install the lifting machine. Also, since it is equipped with a stopper to prevent over-winding, it is possible to prevent the string-like body from being over-wound. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a schematic top view showing the state in which the receiving material of the fall prevention device according to the embodiment of the present invention is open. [Figure 2] 10 is a schematic side view showing the state in which the receiving member of the fall prevention device is open. FIG. [Figure 3] 10 is a schematic side view showing the state in which the receiving member of the fall prevention device is closed. FIG. [Figure 4]FIG. 10 is a schematic diagram showing a structure for fixing the tip of a wire to the tip of an outer frame. DETAILED DESCRIPTION OF THE INVENTION

[0019] A fall prevention device 100 according to an embodiment of the present invention will be described with reference to Fig. 1 to Fig. 4. Note that Fig. 1 to Fig. 4 are diagrams for schematically explaining this embodiment, and the dimensions are exaggerated.

[0020] The fall prevention device 100 is a device that is installed on the side wall of a building during construction work or exterior work on a high-rise building, etc., to catch falling objects such as building materials and tools and prevent them from falling to the ground.

[0021] 1 to 3, the fall prevention device 100 includes a receiving member 10, a support member (diagonal member) 20, a wire 30, a direction changing mechanism 40, and a lifting machine 50. However, the support member 20 does not necessarily have to be included.

[0022] The receiving material 10 is a member for receiving fallen objects such as building materials and tools, and preventing them from falling to the ground. The receiving material 10 is composed of a receiving material main body 11 and an outer frame 12 that supports the receiving material main body 11. Although not shown, the receiving material 10 may also be provided with a reinforcing material that reinforces the outer frame 12.

[0023] Here, the fall prevention device 100 is a two-span device in which two outer frames 12 are connected to each other, thereby connecting two receiving members 10 in the horizontal direction (X-axis direction).

[0024] The receiving material body 11 is rectangular and made of, for example, a plate made of fiber-reinforced plastic or aluminum alloy, a net made of woven threads made of nylon or polyester, wire mesh, or a cloth material such as canvas or high-tensile fiber cloth.

[0025] The outer frame 12 surrounds the outer periphery of the receiving material main body 11. The outer frame 12 consists of a pair of left and right vertical frame members 13 and horizontal frame members 14 that connect the base ends and tip ends of the vertical frame members 13. Each of these frame members 13, 14 is made of a molding material such as fiber-reinforced plastic or aluminum alloy. The receiving material main body 11 is supported by the outer frame 12 that surrounds the outer periphery.

[0026] The base end of the outer frame 12 is rotatably mounted around a horizontal axis (an axis extending horizontally) relative to a member 61 mounted on a temporary scaffolding A on the side wall side of the building, whose side end surface is shown by a dotted line.

[0027] Specifically, for example, a through-hole (not shown) extending horizontally is formed in each of the portions 13a that protrude rearward from the base end of the vertical frame members 13 of the outer frame 12. A through-hole (not shown) extending horizontally is also formed in the member 61. A shaft member 62 with a central axis extending horizontally is inserted through these through-holes. The central axis of the shaft member 62 corresponds to the horizontal axis of the present invention.

[0028] This allows the outer frame 12, and in turn the base end of the receiving material 10, to rotate freely around the central axis of the shaft member 62. As shown in Fig. 2, the receiving material 10 is in an open state (a fallen state) when it protrudes diagonally forward, and as shown in Fig. 3, the receiving material 10 is in a substantially vertical state when it is in a closed state (an upright state).

[0029] The support material 20 is a member that supports (assists) the open state of the receiving material 10. The support material 20 is composed of an outer tube 21 and an inner tube 22 that can slide inside the outer tube 21. The outer tube 21 and the inner tube 22 are each made of a cylindrical material such as fiber-reinforced plastic or aluminum alloy.

[0030] The base end of the outer pipe 21 is rotatably attached to a member 63 provided on temporary scaffolding or the like, and the tip end of the inner pipe 22 is rotatably attached to the tip end of the vertical frame member 13 of the outer frame 12. As a result, as the receiving material 10 rotates, the inner pipe 22 slides relative to the outer pipe 21, and the supporting material 20 supports the receiving material 10 while changing its overall length.

[0031] In one fall prevention device 100, for adjacent vertical frame members 13, it is sufficient to attach the tip of the inner pipe 22 to either one of the vertical frame members 13. Alternatively, a new vertical frame member (connecting body) may be provided between adjacent vertical frame members 13, and the tip of the inner pipe 22 may be attached to this vertical frame member.

[0032] One end (tip) of a single wire 30 is fixed to the tip of the outer frame 12. The wire 30 corresponds to the string-like body of the present invention. Note that the wire 30 may be replaced by a rope, a chain, or the like.

[0033] Specifically, as shown in FIG. 4 , a through-hole (not shown) is formed in the top wall of the tip of each vertical frame member 13 of the outer frame 12, and an L-shaped member 32 is fixed by a bolt 31 inserted through this through-hole. This L-shaped member 32 also has a through-hole (not shown). Another L-shaped member 33 also has a through-hole (not shown), and the L-shaped members 32, 33 are fixed to each other by a bolt 34 inserted through these through-holes. Clamps 35 are fixed to the L-shaped members 33 by welding or the like. When each L-shaped member 33 is fixed, the central axes of these clamps 35 are aligned in a straight line, and a single, straight metal pipe (single pipe) 36 is inserted through each clamp 35 and fixed using the clamp 35.

[0034] In this way, the two outer frames 12 are connected via the pipe 36. The tip of the wire 30 is fixed to the pipe 36 using a wire clamp or the like (not shown). The position where the wire 30 is fixed to the pipe 36 is preferably located at the center of the two connected receiving members 10 in the horizontal direction (left-right direction). This makes it possible to open and close the two receiving members 10 simultaneously without tilting them.

[0035] The direction-changing mechanism 40 is a mechanism that changes the direction of the wire 30, which extends diagonally upward from the tip end side of the receiving material 10 toward the direction-changing mechanism 40, so that it faces upward. The direction-changing mechanism 40 is installed on the temporary scaffolding A or the like.

[0036] Here, the direction-changing mechanism 40 is a pulley 40 that is provided on the temporary scaffolding A or the like and rotates around a horizontal axis. The wire 30 is hung in a groove of the pulley 40. Specifically, although not shown, the pulley 40 can be provided by using a clamp with a pulley and fixing the clamp to a single-tube pipe or the like that is a constituent material of the temporary scaffolding A. Note that the direction-changing mechanism 40 may also be a simple round bar or the like with a groove formed therein in which the wire 30 is hung.

[0037] The direction-changing mechanism 40 is preferably located above the position where the tip of the wire 30 is located when the receiving member 10 is in the closed state. In other words, the distance L1 between the axial center of the shaft member 62 and the direction-changing mechanism 40 is preferably longer than the distance L2 between the axial center of the shaft member 62 and the tip of the vertical frame member 13 of the outer frame 12 to which the wire 30 is fixed. This prevents the direction-changing mechanism 40 from interfering with the receiving member 10, making it possible to close the receiving member 10 until it is upright and approximately vertical.

[0038] However, the deflection mechanism 40 may be located below the position where the tip of the wire 30 is located when the receiving material 10 is in the closed state. In this case, the receiving material 10 cannot be closed until it is in the upright position so that the deflection mechanism 40 does not interfere with the receiving material 10.

[0039] The wires 30 are not limited to those pointing straight up, but may be those pointing roughly upward, and may be tilted in the front-to-back direction up to about 15 degrees, for example. Furthermore, they may also be slightly tilted in the left-to-right direction.

[0040] In temporary scaffolding A or the like, a lifting machine 50 is installed above the direction-changing mechanism 40. Here, the lifting machine 50 is an electric hoist, electric winch, or other such electric hoist, and the other end (rear end) of the wire 30 is fixed to this hoist 50. By operating the hoist 50, the wire 30 can be electrically wound up (pulled up) or unwound (releasing out). Although not shown, the hoist 50 is preferably provided with a stopper to prevent over-winding.

[0041] The lifting machine 50 may be an electric hoist or may be one that can raise and lower the rear end of the wire 30 using power such as an electric hydraulic or hydraulic power.

[0042] As explained above, according to the fall prevention device 100, the wire 30 is pulled up and let out using the pull-up machine 50, which makes it easier to open and close the receiving material 10 compared to the conventional method of doing it manually. Also, since the direction of the wire 30 is changed by the direction-changing mechanism 40 so that it faces upward, the direction of the stress acting on the wire 30 from the pull-up machine 50 is constant, which makes it possible to pull up and let out the wire 30 stably.

[0043] The fall prevention device 100 may be installed along the entire length of the side wall of the building, but multiple fall prevention devices 100 may be installed side by side depending on the maximum length of steel bars, etc. to be lifted using a crane, etc., and conventional fall prevention devices may be installed in other locations.

[0044] The present invention is not limited to the above-described embodiment and can be modified as appropriate. For example, the two-span type in which two receiving materials 10 are connected and opened and closed using one wire 30 has been described, but the present invention may also be a one-span type in which one receiving material 10 uses one wire 30, or a three-span or more type in which three or more receiving materials 10 use one wire 30.

[0045] Furthermore, when connecting multiple receiving members 10 and using one wire 30 to open and close them, a connector may be provided between the outer frames 30, and adjacent outer frames 30 may be connected via this connector. The connector is, for example, a rectangular tube or columnar body having approximately the same length as the vertical frame member 13 and made of the same material as the vertical frame member 13, and is connected to the vertical frame member 13 directly by welding or the like, or indirectly via a member such as a pipe 36 between the vertical frame member 13 and the vertical frame member 13.

[0046] Furthermore, the pipe 36 may be attached to the connector instead of being attached to the vertical frame member 13. Also, the support member 20 may support the connector instead of the vertical frame member 13. By providing the connector in this manner, it becomes possible for the connector to bear the stress acting via the wire 30 and the support member 20.

[0047] Furthermore, when an even number of receiving members 10 are connected and opened and closed using one wire 30, the tip of the wire 30 may be fixed directly to the tip of the central connecting member. In this case, too, it becomes possible to open and close an even number of receiving members 10 symmetrically and stably.

[0048] Furthermore, for example, in the case of a two-span structure in which two receiving materials 10 are connected, it is not limited to using only one wire 30, but two or more wires 30 may be used to open and close the two receiving materials 10 simultaneously.

[0049] Furthermore, although the case where one outer frame 12 supports one receiving material body 11 has been described, one outer frame may support multiple receiving materials. In this case, the receiving material body may be divided in the X-axis direction or in the Y-axis direction. [Explanation of symbols]

[0050] 10...receiving material, 11...receiving material main body, 12...outer frame, 13...vertical frame material, 13a...protruding portion, 14...horizontal frame material, 20...support material (diagonal material), 21...outer pipe, 22...inner pipe, 30...wire (string-like body), 31, 34...bolt, 32, 33...L-shaped member, 35...clamp, 36...pipe, 40...direction change mechanism, pulley, 50...hoisting machine, electric hoist, 61, 63...member, 62...axis member (horizontal axis), 100...fall prevention device, A...temporary scaffolding.

Claims

1. a receiving member whose base end is supported on the side wall of the building so as to be rotatable about a horizontal axis and capable of receiving objects falling from above; a string-like body having one end fixed to the tip end of the receiving material; a deflection mechanism provided on the side wall side of the building above the horizontal shaft, for deflecting the string-like body extending from the tip of the receiving material so that the string-like body is directed toward a lifting machine provided further above; a lifting machine that is provided on the side wall side of the building above the direction-changing mechanism, to which the other end of the string-like body is fixed, and that is capable of lifting and unwinding the string-like body; A fall prevention device characterized in that the distance between the horizontal axis and the deflection mechanism is longer than the distance between the horizontal axis and the tip end to which the string-like body of the receiving material is fixed.

2. 2. A fall prevention device according to claim 1, wherein the tip of the receiving material to which the string-like body is fixed is located at the center of the receiving material in the left-right direction.

3. A fall prevention device as described in claim 1 or 2, characterized in that the receiving material comprises a plurality of receiving material bodies, a plurality of outer frames each surrounding the outer periphery of the receiving material bodies, and a connecting body arranged between the plurality of outer frames and connecting adjacent outer frames.

4. A fall prevention device as described in Claim 3, wherein the multiple outer frames are connected via pipes.

5. A fall prevention device according to any one of claims 1 to 4, wherein the deflection mechanism is a pulley and the string-like body is a wire.

6. A fall prevention device as described in any one of claims 1 to 5, characterized in that the lifting device is a hoist or winch capable of winding and unwinding the string-like body, and is equipped with a stopper to prevent overwinding.

Images