Suspension auxiliary tool and steel frame erection method

Abstract

To provide a suspension auxiliary tool and a steel frame erection method that can reduce a torsional swing of a column member suspended by a lifting machine to improve the safety of work.SOLUTION: A suspension auxiliary tool 1 is fitted to a hook of a lifting machine, and used when a long-sized member is suspended, and comprises a main body part 10 which is formed in one body. The main body part 10 includes: a suspension source-side engagement part 11 which is coupled to the hook; a first engagement part 12 formed below the suspension source-side engagement part 11, to which a string-like member fitted to one end side of the long-sized member is engaged, and a second engagement part 13 formed below the suspension source-side engagement part 11, to which a lifting tool connected to the other end side of the long-sized member is engaged.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a lifting aid and a steel frame erection method. [Background technology]

[0002] 2. Description of the Related Art At construction sites and the like, work is carried out in which steel beams transported by trucks or the like are erected using a lifting machine.

[0003] Conventionally, a member erecting device described in Patent Document 1 has been proposed as a device used when erecting steel frames. This member erecting device includes a first hanging member connecting the hook of a lifting machine and one end of a column member, a second hanging member connecting the hook or the first hanging member and the other end of the column member, a main body interposed between the hook or the first hanging member and the second hanging member, or between the second hanging member and the other end of the member, a rotating shaft provided on the main body and capable of winding up the second hanging member, a rotary damper that limits the rotation speed of the rotating shaft to a predetermined speed or less when the second hanging member is sent out from the main body, and a ratchet mechanism that limits the effect of the rotary damper in limiting the rotation speed of the rotating shaft to a predetermined speed or less to the direction in which the second hanging member is sent out from the main body, and after the column member is cut off from the ground by the lifting machine, the column member is erected by sending out the second hanging member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-31177 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, according to the technology described in Patent Document 1, the first and second hanging members are made of wire material, and the wire material is connected to the hook of the lifting machine. Therefore, when the pillar member is lifted from the ground by the lifting machine, the wire material connected to the hook of the lifting machine is likely to rotate in a torsional direction. Therefore, the pillar member is likely to swing in the torsional direction, which may compromise the safety of the work.

[0006] The present invention has been made to solve the above-mentioned problems in the conventional technology, and aims to provide a lifting aid and a steel frame erection method that can reduce the torsional swaying of a column member lifted by a lifting machine and improve work safety. [Means for solving the problem]

[0007] The lifting aid and steel frame erection method of the present invention have the following configuration.

[0008] The lifting aid of the present invention is attached to the hook of a lifting machine (e.g., a crane, etc.) and is used when lifting a long member (e.g., a steel column 200), The device has a main body (e.g., a main body portion 10) that is integrally formed (e.g., in a plate shape, etc.), The body includes: A hanging base side engaging portion (for example, the hanging base side engaging portion 11) connected to the hook; A first engagement portion (e.g., a first engagement portion 12) that is formed below the hanging base side engagement portion and engages with a string-like member (e.g., a sling wire 160, a chain, etc.) attached to one end side of the elongated member; A second engagement portion (e.g., second engagement portion 13) that is formed below the hanging base side engagement portion and engages with a lifting tool (e.g., a chain block 150) that is connected to the other end side of the elongated member; is formed.

[0009] According to the present invention thus configured, when the main body is connected to the hook of a lifting machine and the long member is lifted by the lifting machine, the hook of the lifting machine, the string-like member attached to one end of the long member, and the lifting tool connected to the other end of the long member are subjected to forces that move them in different directions. Here, the main body is a member in which a hoisting-side engaging part that is connected to the hook of the lifting machine, a first engaging part that engages with the string-like member (e.g., a sling wire, a chain, etc.), and a second engaging part that engages with the lifting tool (e.g., a chain block, etc.) are integrally formed. As a result, even if forces that move in different directions are applied to the main body, the main body does not twist, so the swaying of the long member is reduced and it is possible to lift it more stably.

[0010] In addition, in the lifting aid of the present invention, the main body is formed in a plate shape, The hanging base side engagement portion, the first engagement portion, and the second engagement portion are holes penetrating the main body from one plate surface to the other plate surface, The main body is characterized by further comprising a reinforcing member (e.g., protrusion portion 14, horizontal protrusion portion 14a, central protrusion portion 14b) protruding from at least one of the one plate surface and the other plate surface of the main body and extending from the vicinity of the hole of either the hanging side engagement portion, the first engagement portion or the second engagement portion to the vicinity of the other hole.

[0011] According to the present invention thus configured, the reinforcing member protrudes from the surface of the plate-shaped main body, and when the reinforcing member is placed on a floor or the like from the surface side of the main body, a gap is formed between the main body and the floor, etc., into which the worker's fingers can fit, making it easier to lift the lifting aid and improving the workability when connecting the hook of a lifting machine, etc. Also, by providing a reinforcing member that extends from the vicinity of any one of the holes in the hanging base side engaging part, the first engaging part, or the second engaging part to the vicinity of the other hole, the in-plane strength of the main body can be improved.

[0012] The steel frame erection method of the present invention is a steel frame erection method for erecting a column member of a steel frame structure using the lifting auxiliary tool, The hook (e.g., hook 100) of the lifting machine is connected to the hanging base side engagement portion, the string-like member is engaged with the first engagement portion, and the lifting tool is engaged with the second engagement portion, The string-like member is attached to one end side (e.g., the upper end side) of the pillar member in a sideways position, The hoisting chain of the lifting tool (e.g., load chain 154) is attached to the other end side (e.g., the lower end side) of the pillar member in the sideways position, The method is characterized in that the hook of the lifting machine is moved upward while the other end of the pillar member is moved downward by the lifting tool, thereby placing the pillar member in an upright state.

[0013] According to the present invention configured as described above, the hook of the lifting machine is moved upward, while the other end of the column member is moved downward by the lifting tool, so that the column member in the horizontally-tilted state can be made into an erected state. Conventionally, a column member of a steel frame structure is transported to a construction site in a horizontally-tilted state on the bed of a truck, and after being moved to the erection position of the column member, the column member is erected and the lower end (base) of the column member is connected to the foundation. However, in a narrow construction site, it may be difficult to move the column member in the horizontally-tilted state to the erection position. In contrast, according to (3), for example, the column member in the horizontally-tilted state can be made into an erected state on the bed of a truck or beside the truck, and the column member can be moved to the erection position in this state. This makes it possible to move the column member to the erection position even in a narrow construction site, and further improves the safety of construction. Effect of the Invention

[0014] According to the present invention, it is possible to provide a lifting auxiliary device and a steel frame erection method that can reduce the torsional swaying of a column member lifted by a lifting machine and improve work safety. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is an explanatory diagram showing a state in which a lifting auxiliary device 1 according to an embodiment of the present invention is used. [Diagram 2] FIG. 2 is a front view of the lifting aid 1. [Diagram 3] FIG. 2 is a side view of the lifting aid 1. [Figure 4] 1A to 1C are diagrams illustrating a method for erecting a steel column using a lifting auxiliary tool 1 according to an embodiment of the present invention. [Diagram 5] 1A to 1C are diagrams illustrating a method for erecting a steel column using a lifting auxiliary tool 1 according to an embodiment of the present invention. [Figure 6] 10 is an explanatory diagram showing a state in which a lifting auxiliary device 2 according to another embodiment of the present invention is used. FIG. [Figure 7] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The present invention will be described in more detail below with reference to preferred embodiments. However, the following embodiments are merely examples of the present invention, and the present invention is not limited thereto.

[0017] [Configuration of lifting aids] The configuration of a lifting aid in one embodiment of the present invention will be described.

[0018] Fig. 1 is an explanatory diagram showing a state in which a lifting aid 1 according to an embodiment of the present invention is used. Fig. 2 is a front view of the lifting aid 1. Fig. 3 is a side view of the lifting aid 1.

[0019] As shown in FIG. 1, the lifting aid 1 is attached to a hook 100 of a lifting machine such as a crane, and is used, for example, when lifting long members such as pillar members of a steel-framed building.

[0020] The lifting aid 1 comprises a main body portion 10, a hanging base side engagement portion 11, a first engagement portion 12, a second engagement portion 13, and a protrusion portion 14.

[0021] The main body 10 is a flat plate member made of metal and having a T-shape when viewed from the front, and has a horizontal portion 10a extending horizontally and a central portion 10b extending at a right angle from the center of the horizontal portion 10a.

[0022] The hanging base side engaging portion 11, the first engaging portion 12, and the second engaging portion 13 are formed of through holes formed in the main body portion 10. The hanging base side engaging portion 11 is formed at the tip portion of the central portion 10b, the first engaging portion 12 is formed at one end portion of the horizontal portion 10a, and the second engaging portion 13 is formed at the other end portion of the horizontal portion 10a.

[0023] The hanging-side engagement portion 11 is a through-hole that penetrates from one plate surface of the main body portion 10 to the other plate surface and has a rectangular shape with one side protruding in an arc shape, and the arc-shaped portion faces the tip side of the horizontal portion 10a. The first engagement portion 12 and the second engagement portion 13 are circular through-holes that penetrate from one plate surface of the main body portion 10 to the other plate surface.

[0024] The protrusion 14 is a long convex portion protruding from the plate surface of the main body 10, and has a horizontal protrusion 14a formed on the horizontal portion 10a and extending along the longitudinal direction of the horizontal portion 10a, and two central protrusions 14b, 14b formed on the central portion 10b and extending along the longitudinal direction of the central portion 10b. The horizontal protrusion 14a is disposed between the long side of the horizontal portion 10a opposite to the long side along which the central portion 10b extends, and the first engagement portion 12 and the second engagement portion 13. The horizontal protrusion 14a and the central protrusion 14b are formed, for example, by fixing a thin, long member made of a metal rectangular column to the plate surface of the main body 10 by welding or the like.

[0025] The central protrusions 14b, 14b are disposed on both sides of the hanging base side engaging portion 11, between the hanging base side engaging portion 11 and the first engaging portion 12, and between the hanging base side engaging portion 11 and the second engaging portion 13. In other words, the ends of the central protrusions 14b, 14b and the end of the horizontal protrusion 14a are disposed near the first engaging portion 12 and the second engaging portion 13.

[0026] 2, the protrusions 14 are formed only on one plate surface of the main body 10, but the protrusions 14 may be formed on both plates of the main body 10, and the protrusions 14 may have the same or different forms on both plates of the main body 10. For example, central protrusions 14b, 14b may be formed on one plate surface of the main body 10, and horizontal protrusions 14a may be formed on the other plate surface.

[0027] The hoisting-side engagement portion 11 engages with the hook 100 of a lifting machine. The first engagement portion 12 engages with a string-like sling wire 160 for hoisting the steel column 200. The second engagement portion 13 engages with a hook 152 of the chain block 150. Note that, although the present embodiment uses the sling wire 160 as an example, a chain may be used, and any string-type member capable of suspending a heavy load may be used.

[0028] The chain block 150 comprises a block body 151, a hook 152 for suspending the block body 151, a hand chain 153, and a load chain 154. The hand chain 153 and the load chain 154 extend from the block body 151. The hand chain 153 is an endless member. The block body 151 comprises a mechanism for winding up or down the load chain 154 by circulating the hand chain 153. A hook member is attached to the tip of the load chain 154.

[0029] [How to use the lifting aid] Next, a method of using the lifting aid 1 will be described with reference to FIG.

[0030] The worker operates the lifting machine to position the hook 100 in advance at the center of the steel column 200 in the longitudinal direction.

[0031] An operator attaches the shackle 102 to the hoisting base side engaging portion 11 of the hoisting aid 1, and passes the hook 100 of the lifting machine through the shackle 102, thereby attaching the hoisting aid 1 to the hook 100. The hoisting aid 1 can be placed on the ground or a floor with the surface on which the horizontal protrusions 14a and the central protrusions 14b, 14b are formed facing downward, forming a gap between the main body 10 and the ground or a floor, etc., large enough for a finger to fit in. This makes it easier to lift the hoisting aid 1, and improves the workability of attaching the hoisting aid 1 to the hook 100. The hook 100 may be directly passed through the hoisting base side engaging portion 11 for connection without the shackle 102.

[0032] Next, the worker connects one end of the string-like sling wire 160 to the first engagement portion 12, or connects one end of the sling wire 160 to the first engagement portion 12 via a shackle.

[0033] Next, the worker connects the lifting aid 1 to the chain block 150 by passing the hook 152 of the chain block 150 through the second engagement part 13, or by attaching a shackle to the second engagement part 13 and passing the hook 152 through the shackle. At this time, it is desirable to make the length of the load chain 154 extending from the chain block 150 the same as the length of the sling wire 160.

[0034] Next, the worker engages the tip of the load chain 154 with one end (lower end) of the steel column 200. Also, the worker engages the other end of the sling wire 160 with the other end (upper end) of the steel column 200. It is desirable that the engagement position between the other end of the sling wire 160 and the steel column 200 is on the central axis of the steel column 200. This allows the steel column 200 to be hung on the lifting machine so that the longitudinal direction of the steel column 200 is horizontal.

[0035] Then, when the worker operates the lifting machine to move the hook 100 upward, the steel column 200 can be lifted upward. At this time, the lifting aid 1 is pulled from three different directions, namely, a tension pulling the part of the hoisting source side engaging part 11 upward and a tension pulling the part of the first engaging part 12 along the sling wire 160. In this state, when the steel column 200 rotates horizontally around the hook 100 as an axis, a torsional force is applied to the lifting aid 1. Here, the lifting aid 1 has high rigidity because the horizontal protrusions 14a and the central protrusions 14b, 14b protrude from the main body 10 made of a metal plate, and is not easily deformed by a torsional force. Therefore, it is possible to suppress the horizontal rotation of the steel column 200 to a small extent, and it is possible to lift the steel column 200 more stably.

[0036] [Steel frame construction method] Next, a method for erecting a steel column 200 using the lifting aid 1 will be described with reference to Figures 1, 4, and 5. Figures 4 and 5 are diagrams for explaining a method for erecting a steel column using the lifting aid 1 in one embodiment of the present invention.

[0037] The steel column 200 is placed on its side on the bed of a truck and is transported to the construction site in that state. Then, the truck is moved to the erection position of the steel column 200, and the steel column 200 is erected and the lower end (base) of the steel column 200 is connected to the foundation of the building.

[0038] However, in a small construction site, it may be difficult to move the column member to the erection position while it is lying down. In such a case, it is possible to apply the erection method of the steel column 200 using the lifting support tool 1 described below.

[0039] First, a truck is moved close to the construction site. For example, the truck is parked next to the road entrance to the construction site.

[0040] The worker connects the hook 100 of the lifting machine to the hoisting side engagement part 11, engages the sling wire 160 with the first engagement part 12, and engages the hook 152 of the chain block 150 with the second engagement part 13. Furthermore, the worker engages the tip of the load chain 154 with one end of the steel column 200, i.e., the lower end, and engages the other end of the sling wire 160 with the other end of the steel column 200, i.e., the upper end.

[0041] Next, a worker operates the lifting machine to move the hook 100 upward, thereby hoisting the steel column 200 while maintaining the steel column 200 facing horizontally to the ground as shown in Fig. 1. Note that the truck may be moved after the steel column 200 is hoisted.

[0042] Next, the worker rotates the hand chain 153 to wind down the load chain 154. This extends the load chain 154, and the lower end of the steel column 200 moves downward in an arc. Then, by rotating the hand chain 153 until the lower end of the steel column 200 abuts on or approaches the ground, the steel column 200 is maintained in an inclined state as shown in FIG. 4.

[0043] Next, the worker operates the lifting machine to move the hook 100 upward while maintaining the tilted state of the steel column 200, and separates the lower end of the steel column 200 from the ground by a predetermined distance. Then, the worker rotates the hand chain 153 again until the lower end of the steel column 200 abuts on or approaches the ground.

[0044] By repeating this operation, the steel column 200 is brought into an erected state as shown in Fig. 5. Then, the worker operates the lifting machine to transport the steel column 200 from the entrance to the construction site while maintaining the steel column 200 in an erected state, and after lowering the steel column 200 to the foundation of the building, connects the steel column 200 to the foundation of the building. The number of times the above-mentioned operation is repeated can be appropriately set according to the length and weight of the steel column 200. For example, if the steel column 200 is relatively short, the steel column 200 may be brought into an erected state by operating the hand chain 153 once, and if the steel column 200 is relatively long, the steel column 200 may be brought into an erected state in a plurality of stages.

[0045] [Effects] According to the present embodiment configured as described above, the lifting aid 1 has a main body 10 made of a metal plate, and is integrally formed with a hoisting base side engaging part 11 connected to a hook 100 of a lifting machine, a first engaging part 12 with which a sling wire 160 engages, and a second engaging part 13 with which a chain block 150 engages. Here, the hook 100 of the lifting machine, the sling wire 160 attached to one end of the steel column 200, and the chain block 150 connected to the other end of the long member are subjected to forces that tend to move them in different directions. However, when forces that move them in different directions are applied to the main body 10, the twist of the main body 10 can be reduced, making it possible to lift the steel column 200 more stably.

[0046] Furthermore, according to this embodiment, the horizontal ridges 14a and central ridges 14b, 14b protrude from the surface of the plate-shaped main body 10, so that when the horizontal ridges 14a and central ridges 14b, 14b are placed on the ground or a floor from the surface side of the main body 10, a gap is formed between the main body 10 and the ground or a floor, etc., into which the worker's fingers can fit. This makes it easier to lift the lifting aid 1, and improves the workability of attaching the lifting aid 1 to the hook 100.

[0047] Furthermore, central protrusions 14b, 14b are provided near the hanging-side engaging portion 11, and horizontal protrusions 14a and central protrusions 14b, 14b are provided near the first engaging portion 12 and the second engaging portion 13. This makes it possible to improve the in-plane strength of the main body 10, and since the main body 10 does not twist, the steel column 200 can be lifted more stably.

[0048] According to the steel frame erection method of this embodiment, the hook 100 of the lifting machine is moved upward while the lower end side of the steel frame column 200 is moved downward by the chain block 150, so that the steel frame column 200 in a horizontally laid state can be made into an erected state. As a result, for example, the steel frame column 200 in a horizontally laid state placed on the bed of a truck or beside a truck can be made into an erected state, and in this state, the steel frame column 200 can be moved to the erection position, so that the steel frame column 200 can be moved to the erection position even in a small construction site. Moreover, when the steel column 200 is moved in a horizontal state, even if the steel column 200 rotates slightly in the circumferential direction around the hook 100, the swing width of both ends becomes large, so the worker needs to pay attention to the movement of the steel column 200, but when the steel column 200 is moved in an upright state, even if the steel column 200 rotates slightly in the circumferential direction around the hook 100, the steel column 200 is less likely to come toward the worker. In this way, the safety of the construction is improved.

[0049] The present invention is not limited to the above-described embodiment, and modifications and improvements within the scope of the present invention that can achieve the object of the present invention are included in the present invention.

[0050] Fig. 6 is an explanatory diagram showing a state in which a lifting aid 2 according to another embodiment of the present invention is used. Fig. 7 is a front view of the lifting aid 2.

[0051] The lifting aid 2 is connected to a hook 100 (see FIG. 1) of a lifting machine when an electric chain block is used as the chain block 150. The chain block 150 shown in FIG. 6 includes a block body 151, a hook 152 for suspending the block body 151, a load chain 154, a battery device 155, a hook 156 attached to the tip of the load chain 154 and engaging with a steel column 200, and a controller 157. The block body 151 is provided with a motor that serves as a power source for winding up and rewinding the load chain 154.

[0052] The lifting aid 2 includes a main body portion 20, a lifting base side engagement portion 21, a first engagement portion 22, a second engagement portion 23, and a battery receiving base 24.

[0053] The main body 20 is a flat plate member made of metal and having a substantially rectangular shape when viewed from the front.

[0054] The hanging base side engaging portion 21 and the first engaging portion 22 are formed of through holes formed in the main body portion 20. The hanging base side engaging portion 21 is formed on an extension piece 20a that extends upward from a part of the upper side of the main body portion 20. The first engaging portion 22 is formed on the lower portion of the main body portion 20. The second engaging portion 23 has a pair of oscillating pieces 23a, 23a facing each other, and pins 23b, 23b that respectively connect both ends of the pair of oscillating pieces 23a, 23a.

[0055] A through hole is formed near the lower edge portion below the hanging side engagement portion 21 in the main body portion 20, and the second engagement portion 23 is attached to the main body portion 20 by opposing one end of a pair of oscillating pieces 23a, 23a to sandwich this through hole and passing one pin 23b through it.

[0056] The battery receiving stand 24 is a rectangular flat plate member that is connected to the lower side of the main body 20 and extends in a direction perpendicular to the plate surface of the main body 20. The battery device 155 is placed on the battery receiving stand 24.

[0057] Although not shown in FIGS. 6 and 7, the main body 20 may also be formed with protrusions similar to the horizontal protrusions 14a and central protrusions 14b of the main body 10 shown in FIG.

[0058] Next, a method of using the lifting aid 2 will be described. When using the lifting aid 2, first, an operator places and fixes the battery device 155 on the battery support 24. Next, the hook 100 of the lifting machine is passed through the hoisting-side engaging portion 21 to engage it. Next, the operator engages the string-like sling wire 160 for lifting the steel column 200 with the first engaging portion 22. Furthermore, the operator suspends the block body 151 from the second engaging portion 23. Then, the sling wire 160 is engaged with the tip end of the steel column 200, and the hook 156 attached to the load chain 154 of the chain block 150 is engaged with the base end of the steel column 200. From this state, the worker operates the controller 157 of the lifting machine and the chain block 150 to lift the steel column 200 and then electrically extend the load chain 154 repeatedly, in the same manner as in the example of using the lifting aid 1 shown in Figures 4 and 5, to bring the steel column 200 into an upright state. After the steel column 200 is in an upright state, the worker operates the lifting machine to move the steel column 200 to its erection position.

[0059] According to the lifting aid 2 in this embodiment, the load chain 154 is extended electrically, eliminating the need to operate a hand chain as in a manual chain block, and reducing the risk of the steel column 200 shaking when the load chain 154 is extended, improving the safety of the work. In addition, by placing the battery device 155 on the battery support 24 provided on the lifting aid 2, the battery can be easily replaced without removing the main body of the chain block 150 from the lifting aid 2. [Explanation of symbols]

[0060] 1 Lifting aids 10 Main body 10a Horizontal part 10b central part 11 Hanging base side engagement part 12 First engagement portion 13 Second engagement portion 14 Projection part 14a Horizontal protrusion 14b Central protrusion 100 Hooks 102 Shackle 150 Chain Block 151 Block body 152 Hook 153 Hand Chain 154 Load Chain 160 Wire 200 Steel columns

Claims

1. A lifting aid that is attached to a hook of a lifting machine and is used when lifting a long member, an integrally formed body; The body includes: A hanging base side engagement portion connected to the hook; a first engagement portion formed below the hanging base side engagement portion and engaging with a string-like member attached to one end side of the elongated member; A second engagement portion is formed below the hanging base side engagement portion and engages with a lifting tool connected to the other end side of the elongated member; A lifting aid characterized in that:

2. The main body is formed in a plate shape, The hanging base side engaging portion, the first engaging portion, and the second engaging portion are holes penetrating the main body from one plate surface to the other plate surface, The lifting aid described in claim 1, further comprising a reinforcing member protruding from at least one of the one plate surface and the other plate surface of the main body and extending from near the hole of either the hanging base side engagement portion, the first engagement portion or the second engagement portion to near the other hole.

3. A steel frame erection method for erecting a column member of a steel frame structure using the lifting auxiliary device according to claim 1 or 2, The hook of the lifting machine is connected to the hanging base side engagement portion, the string-like member is engaged with the first engagement portion, and the lifting tool is engaged with the second engagement portion, The string-like member is attached to one end side of the pillar member in a sideways position, The hoisting chain of the lifting tool is attached to the other end side of the pillar member in the sideways position, A steel frame erection method characterized by moving the hook of the lifting machine upward while using the lifting tool to move the other end of the column member downward, thereby placing the column member in an upright position.

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