Lifting tool and method for attaching oblique member using the same

Abstract

To provide a lifting tool capable of suitably lifting an object to be lifted obliquely, without providing a hook portion on the object itself and to provide a method for attaching an oblique member using the lifting tool.SOLUTION: A lifting tool 5 has a long member 51 that is used while a long-side direction thereof is kept directed in a horizontal direction or an oblique direction. The lifting tool is capable of lifting an oblique member 1 as a long object to be lifted, which has a substantially rectangular cross-section, while keeping the oblique member 1 placed on an upper surface portion of the long member 51 along the long-side direction. The long member 51 has, on a lower-surface side of the long member 51, for example, two engaging portions 52 with which a suspension piece 6, such as a wire or a chain, is engaged.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a lifting tool capable of lifting an object to be lifted, such as a diagonal member, obliquely, and a method for attaching a diagonal member using the same.

Background Art

[0002] Diagonal members such as buckling restraint braces are attached to gusset plates fixed to a building at joint portions located at both ends thereof in a state of being lifted obliquely. For this reason, two annular hanging portions are welded and fixed to the upper surface portion of this diagonal member at intervals in the longitudinal direction of the diagonal member, and suspension measures having different lengths connected to these hanging portions are hung on the hanging hook of a crane to lift this diagonal member obliquely.

[0003] Note that Patent Document 1 discloses a lifting jig capable of restricting the horizontal movement of a suspension wire by a restricting portion even when at least two suspension wires hung on a suspended load at intervals are commonly looped on a hanging portion of a crane, but with this configuration, the suspended load cannot be lifted obliquely.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] After the diagonal member is attached to the building, the above-mentioned hanging portions become unnecessary. Leaving them is not aesthetically pleasing, while when removing the above-mentioned hanging portions by gas cutting or the like, the efficiency of construction work will be reduced due to the labor involved in the work.

[0006] An object of the present invention is to provide a lifting tool that can appropriately lift an object to be lifted obliquely without providing a hooking portion on the object to be lifted itself, and a method for attaching a diagonal member using the same.

Means for Solving the Problems

[0007] In order to solve the above problems, the lifting tool of the present invention has a long member, and a long object to be lifted is placed on the upper surface portion of the long member along the long side direction of the long member to lift the object to be lifted. The long member is characterized by having an engaging portion to which a suspension rope is engaged.

[0008] With the above configuration, it is not necessary to provide a hooking portion on the object to be lifted itself. For example, two suspension ropes can be hooked on the lifting hook of a crane to appropriately lift the object to be lifted obliquely. Therefore, it is possible to suppress a decrease in appearance due to leaving the above hooking portion, and the occurrence of labor for removing the above hooking portion by gas cutting or the like.

[0009] The lifting tool has the engaging portion at positions where the distances from the center position in the long side direction of the long member to the end direction of the long member are equal to each other, and the long member may be inclined at a predetermined angle by lifting with the suspension ropes having different lengths from each other using the engaging portions at the equal positions.

[0010] Alternatively, the lifting tool has the engaging portion at positions where the distances from the center position in the long side direction of the long member to the end direction of the long member are not equal to each other, and the long member may be inclined at a predetermined angle by lifting with the suspension rope using the engaging portions at the unequal positions.

[0011] The above-mentioned engagement part has a size through which the above-mentioned suspension cable passes, and may be an insertion part formed in a direction orthogonal to the long side direction of the above-mentioned long member. According to this, the suspension cable is not engaged with each side surface part of the long member, but is engaged with the long member in such a manner that the suspension cable passes through the short side direction of the long member.

[0012] Locking means for fastening the end of the object to be lifted to the long member may be provided on the end side in the long side direction of the long member. According to this, it is possible to prevent the obliquely lifted object to be lifted from sliding on the upper surface part of the long member by the locking means.

[0013] The long member may be composed of two or more members that can be displaced relative to each other in the long side direction of the long member and may be stretchable in the long side direction. According to this, it becomes possible to handle a plurality of types of objects to be lifted having different lengths with one lifting tool.

[0014] The object to be lifted may be a diagonal member. Further, the diagonal member may have a main body part and joint parts located on both end sides in the long side direction of the main body part, and may have a stepped part where the main body part side rises with respect to the joint part.

[0015] In addition, the method for attaching the diagonal member of the present invention is characterized in that, with the diagonal member placed on the upper surface part of the lifting tool, the upper end side of the suspension cable is hooked on the lifting hook of the crane, the diagonal member is lifted obliquely, and after the diagonal member in this oblique state is attached to a gusset plate fixed to the building frame, the lifting hook is lowered, the lifting tool is placed in a state of being detached from the vertical plane of the building, the suspension cable is removed from the diagonal member and hooked on the lifting hook, and the lifting tool is returned to the ground by the crane.

[0016] According to the above method, the lifting tool can be placed on the floor of the building or the like without being interfered by columns or the like located on both sides of the diagonal member, the suspension cable can be removed from the diagonal member and hooked on the lifting hook, and the lifting tool can be returned to the ground by the crane.

Advantages of the Invention

[0017] In the present invention, an object to be lifted such as a diagonal member can be appropriately lifted obliquely, and the problem in the case of providing a hooking portion on the object to be lifted as in the prior art can be solved.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0019] (Embodiment 1) Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. As shown in FIGS. 1 and 2, the hoisting tool 5 of the embodiment has a long member 51 that is used with its long side direction horizontal or inclined. A diagonal member 1 with a substantially rectangular cross-section, which is a long object to be hoisted, is placed on the flat upper surface portion of the long member 51 along the long side direction to hoist the diagonal member 1.

[0020] The long member 51 is made of a metal material or a wooden material. Further, the long member 51 has a rectangular cross-section orthogonal to the long side direction, and the width of this cross-section is slightly narrower than the width of the diagonal member 1. Also, the length of the long member 51 is approximately the same as the length of the diagonal member 1.

[0021] The long member 51 is provided with, for example, two engaging portions 52 on the lower surface side of the long member 51, to which a suspension cable 6 such as a wire or a chain is engaged. Each engaging portion 52 has, for example, a flange portion on the outer peripheral surface of a metal cylindrical portion (insertion portion), and a grounding plate portion on the outer peripheral surface of the cylindrical portion in an arrangement parallel and opposite to this flange portion. This engaging portion 52 is arranged with the center line direction of the cylindrical portion orthogonal to the long side direction of the long member 51, and is fixed to the lower surface portion of the long member 51 by screws screwed in from the flange portion.

[0022] Also, the two engaging portions 52 are located, for example, at an equal distance from the center position in the long side direction of the long member 51 (which is also the center position in the long side direction of the diagonal member 1).

[0023] The hoisting tool 5 is provided with a retaining portion 53 (locking means) for fixing the end portion of the diagonal member 1, which is the object to be hoisted, to the long member 51 at a location on the end side in the long side direction of the long member 51. This retaining portion 53 is composed of, for example, a through hole 53a penetrating in a direction orthogonal to the long side direction (short side direction) of the long member 51, and a tightening tool 53b passed through this through hole 53a. The tightening tool 53b is, for example, a lashing belt wound around the end portion of the diagonal member 1, and the belt can be tightened using a ratchet mechanism portion to fix the end portion of the diagonal member 1 to the long member 51.

[0024] The suspension cable 6 has, for example, annular portions at both ends. One annular portion on one side is passed from one open end of the engaging portion 52 to the opposite open end, so that it is engaged with the engaging portion 52. In this state, the annular portions at both ends can be hooked on the lifting hook 8 of the crane as shown in FIG. 3.

[0025] Also, the length of the suspension cable 6 on the side closer to the lower end when the diagonal member 1 is inclined is made longer than the length of the suspension cable 6 on the side closer to the upper end when the diagonal member 1 is attached and inclined. When the lifting tool 5 is lifted by the two suspension cables 6, the end of the diagonal member 1 on the side of the shorter suspension cable 6 will be located higher.

[0026] The diagonal member 1 is exemplified by a buckling restraining brace. This diagonal member 1, which is a buckling restraining brace, has, as an example, a structure including a core member 2 and a pair of restraining members 3. The core member 2 has a steel plate-like body and joint portions 22 located at both ends in the long side direction of the plate-like body and joined to other members. The core member 2 is fixed to the building frame by bolts passed through bolt insertion holes formed in the joint portions 22.

[0027] The joint portion 22 has a substantially cruciform cross-section by fixing a plate piece portion extending in the longitudinal direction of the plate-like body in an orthogonal arrangement to the extending portions extending from both ends of the plate-like body by welding.

[0028] The restraining members 3 are respectively located opposite to each other on the weak axis planes orthogonal to the weak axis direction of the core member 2. Each restraining member 3 includes a box-shaped member 31 and a hardened member such as concrete (not shown).

[0029] Next, a method for attaching the diagonal member 1 to the building frame using the above-described lifting tool 5 will be described. First, as shown in FIG. 3, with the diagonal member 1 placed on the upper surface portion of the lifting tool 5 horizontally placed on the ground, when the upper end side of the suspension cable 6 is hooked on the lifting hook 8 of the crane and the diagonal member 1 is lifted, since the lengths of the suspension cables 6 are different from each other, as shown in FIG. 4, the diagonal member 1 is lifted obliquely.

[0030] In addition, when the suspension cable 6 comes into contact with the diagonal member 1, there is a risk of scratching the paint on the diagonal member 1. Therefore, a cushioning material such as rubber or cloth may be interposed at the contact point. Also, the lifting tool 5 will function as a sleeper for the diagonal member 1 on the ground.

[0031] As shown in FIG. 5, the joint portion 22 of the diagonal member 1 in this inclined state is attached to the gusset plate 9 of the building frame using a plurality of mounting plates and bolts / nuts.

[0032] Then, after releasing the locking of the diagonal member 1 by the retaining portion 53, the lifting hook 8 is lowered to disengage the lifting tool 5 from below the diagonal member 1. At this time, in order to prevent the column or the like from interfering with the lowering of the lifting tool 5, the lifting tool 5 is separated from the vertical plane of the building (made non-parallel) and the lifting tool 5 is lowered, and the lifting tool 5 is placed on the floor or leaned against something. Then, the suspension cable 6 is removed from the diagonal member 1 and hooked onto the lifting hook 8 again, and the lifting tool 5 is returned to the ground by the above crane.

[0033] With the above-described lifting tool 5, it is not necessary to provide a hooking portion on the diagonal member 1 itself, which is the object to be lifted. Two suspension cables 6 having different lengths are engaged with the engaging portion 52 of the long member 51, and these suspension cables 6 are hooked onto the lifting hook 8 of the crane, so that the diagonal member 1 can be appropriately lifted obliquely. Therefore, it is possible to avoid the deterioration of the appearance due to the remaining of the conventional hooking portion and the labor required for removing the hooking portion by gas cutting or the like.

[0034] In addition, since the engaging portion 52 has a cylindrical portion (insertion portion) that is orthogonal to the long side direction of the long member 51 and has a size through which the annular portion of the suspension cable 6 passes, the suspension cable 6 is not engaged with each side surface portion of the long member 51, but the suspension cable 6 is engaged with the long member 51 in a manner of passing through the short side direction of the long member 51. Of course, an embodiment in which the suspension cable 6 is engaged with each side surface portion of the long member 51 can also be adopted.

[0035] In addition, when the lifting tool 5 is provided with a retaining portion 53 for locking the end portion of the diagonal member 1 on the end side in the long side direction of the long member 51, the retaining portion 53 can prevent the diagonally lifted diagonal member 1 from sliding on the upper surface portion of the long member 51. Note that the buckling restraint brace exemplified as the diagonal member 1 has steps on its four circumferences where the ends of the restraint member 3, which is the main body portion, rise with respect to the joint portion 22. By hooking the fastening tool 53b on this step portion, it becomes possible to more reliably prevent the sliding movement of the diagonal member 1.

[0036] Instead of or in addition to the above-mentioned retaining portion 53, other locking means may be provided. For example, a convex portion that catches on the lower step portion of the above-mentioned step portion may be provided as a locking means on the upper surface portion of the long member 51. Alternatively, a high-friction plate or an adhesive plate having minute irregularities may be provided as a locking means on the upper surface portion at the end side of the long member 51.

[0037] FIGS. 6(A) and 6(B) show a modified example of the lifting tool 5. This lifting tool 5 has an engaging portion 52 at a position where the distances from the center in the long side direction of the long member 51 to the end direction of the long member 51 are unequal to each other. By using the engaging portion 52 at the position where the distances are unequal, for example, by lifting with suspension ropes 6 having the same length, the long member 51 is inclined at a predetermined angle.

[0038] In addition, in the form shown in FIG. 6, a suspension rope length variable portion 61 composed of an electric winch, an electric hoist, a chain block, etc. is connected to each suspension rope 6. By shortening the lengths of both suspension ropes 6 by the suspension rope length variable portion 61, the inclination angle of the long member 51 can be increased. Conversely, by lengthening the lengths of both suspension ropes 6 by the suspension rope length variable portion 61, the lifting tool 5 can be detached from the diagonal member 1, the lifting tool 5 can be lowered, and the lifting tool 5 can be placed on the floor or the like.

[0039] In the configuration using the suspension ropes 6 having different lengths shown in FIG. 3 and the like, a suspension rope length variable portion 61 may be provided on one of the suspension ropes 6. In addition, it is desirable that these suspension rope length variable portions 61 have a controller that can be controlled wirelessly.

[0040] (Embodiment 2) Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. As shown in FIGS. 7(A) and 7(B), the long member 51 of the hoist 5 of the embodiment is composed of two prismatic members 51A that can be displaced relative to each other in the long side direction of the long member 51, and can be expanded and contracted in the long side direction. Each prismatic member 51A has an insertion portion 51a through which the suspension cable 6 can pass in a direction perpendicular to the long side direction of the long member 51. A large number of insertion portions 51a are formed at equal intervals in the long side direction. Note that some of the insertion portions 51a can also serve as through holes 53a.

[0041] By passing a bolt through any of the insertion portions 51a of the overlapping portions of the two prismatic members 51A arranged offset from each other in the longitudinal direction and screwing and tightening a nut onto the tip screw portion of this bolt, the two horizontally arranged prismatic members 51A can be connected and fixed to each other. And by adjusting the length of the overlap, it becomes possible to adjust the length of the long member 51 to match the length of the diagonal member 1. Also, the width of the two horizontally arranged members is made slightly narrower than the width of the diagonal member 1.

[0042] In the example shown in FIGS. 7(A) and 7(B), suspension cables 6 having different lengths are passed through the insertion portions 51a that are equidistant from the center position in the longitudinal direction of the long member 51. However, it is not limited to this, and for example, a mode in which suspension cables 6 having the same length are passed through the insertion portions 51a at appropriate positions can also be adopted.

[0043] In addition, as shown in FIGS. 7(A) and 7(B), the long member 51 is composed of two horizontally arranged prismatic members 51A as shown in FIG. 8(A), but it is not limited thereto. As shown in FIG. 8(B), it may be composed of two horizontally arranged square tubular members 51B. Alternatively, as shown in FIG. 8(C), the long member 51 may be composed of two H-shaped members 51C and a connecting plate member 51D that connects the web portions of these H-shaped members 51C. The two H-shaped members 51C are connected and fixed using the connecting plate member 51D and bolts and nuts in a state where their longitudinal directions are aligned with each other. One flange portion of both H-shaped members 51C becomes the upper surface portion of the long member 51, and the other flange portion becomes the lower surface portion of the long member 51.

[0044] In the above example, a buckling restraint brace with a rectangular cross-section was shown as the object to be lifted. However, it is not limited to such a rectangular cross-section, and a buckling restraint brace with a circular cross-section can also be lifted. For a buckling restraint brace with a circular cross-section, the upper surface portion of the long member 51 preferably has a rectangular concave groove or a curved surface concave groove. It is desirable that the lower side of the buckling restraint brace with a circular cross-section is held. Further, the diagonal member 1 is not limited to a buckling restraint brace, and may be a brace with another structure or a brace such as an H-shaped steel.

[0045] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made within the same scope or an equivalent scope as the present invention with respect to the illustrated embodiments.

Explanation of Reference Numerals

[0046] 1: Diagonal member 2: Core material 3: Restraining material 5: Lifting tool 6: Suspension cable 8: Suspension hook 9: Gusset plate 22: Joint portion 31: Box-shaped member 51: Long member 51A: Prismatic member 51B: Angular cylindrical member 51C: H-shaped member 51D: Connecting plate member 51a: Insertion part (engagement part) 52: Engagement part 53: Fixing part (locking means) 53a: Through hole 53b: Fastener 61: Variable length part of suspension cable

Claims

1. A lifting tool having a long member, with a long object to be lifted placed on the upper surface of the long member along the long side direction of the long member to lift the object to be lifted, characterized in that the long member is provided with an engaging portion to which a suspension cable is engaged.

2. In the lifting tool according to Claim 1, the engaging portion is provided at positions where the distances from the center position in the long side direction of the long member to the end direction of the long member are equal to each other, and the long member is inclined at a predetermined angle by lifting with the suspension cables of different lengths using the engaging portions at the equal positions.

3. In the lifting tool according to Claim 1, the engaging portion is provided at positions where the distances from the center position in the long side direction of the long member to the end direction of the long member are unequal to each other, and the long member is inclined at a predetermined angle by lifting with the suspension cable using the engaging portion at the unequal position.

4. In the lifting tool according to Claim 1, the engaging portion has a size through which the suspension cable passes, and is an insertion portion formed in a direction orthogonal to the long side direction of the long member.

5. In the lifting tool according to Claim 1, a locking means for fastening the end of the object to be lifted to the long member is provided on the end side in the long side direction of the long member.

6. In the lifting tool according to Claim 1, the long member is composed of two or more members that can be displaced relative to each other in the long side direction of the long member, and is stretchable in the long side direction.

7. In the lifting tool according to any one of Claims 1 to 6, the object to be lifted is a diagonal member.

8. In the lifting tool according to Claim 7, the diagonal member has a main body portion and joint portions located on both end sides in the long side direction of the main body portion, and has a stepped portion where the main body portion side rises with respect to the joint portion.

9. With the diagonal member placed on the upper surface portion of the hoisting tool according to claim 7, hook the upper end side of the hoisting rope onto the crane's lifting hook, lift the diagonal member obliquely, and after attaching this diagonally positioned diagonal member to a gusset plate fixed to the building frame, lower the lifting hook and place the hoisting tool in a state where it is detached from the vertical plane of the building, remove the hoisting rope from the diagonal member, hook it onto the lifting hook, and return the hoisting tool to the ground with the crane. A method for attaching a diagonal member, characterized by the above steps.

Images