Buffer member and erection method

Abstract

Provided are a buffer member and an erection method that can suppress the reaction of a suspended load during erection and enhance safety. 【Solution means】The buffer member according to one embodiment is a buffer member 1 that supports the lower end portion S1 of the suspended load S when the suspended load S is erected by a crane. The buffer member 1 includes a first member 11 and a second member 12 that is placed on the first member 11 and on which the lower end portion S1 of the suspended load S is placed. The second member 12 is made of a material that is softer than the first member 11.

Description

Technical Field

[0001] The present disclosure relates to a buffer member used when lifting a suspended load, and a lifting method.

Background Art

[0002] Patent Document 1 describes a lifting jig also used for erecting a column. The lifting jig also used for erecting has an I-bar, a disk-shaped base material having a fixing screw hole formed on one side, and a base cover covering the base material. The precast concrete column has a screw hole. The base material is fixed to the precast concrete column by bolts.

[0003] The I-bar has a ring-shaped portion sandwiched between the base material and the base cover. The ring-shaped portion is rotatable with respect to the base material and the base cover in a state where the I-bar is attached to the precast concrete column. A shackle to which a hook of a hoist is hooked is provided at an end of the I-bar opposite to the ring-shaped portion. By hooking the hook to this shackle and pulling up the I-bar by the hoist, the precast concrete column is erected.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, when lifting a suspended load such as the above-described precast concrete column, a reaction may occur after the suspended load is erected so as to extend in the vertical direction. Due to this reaction, the suspended load and the hoist may be in an unstable state. Therefore, there is room for improvement in the safety during the erection work.

[0006] The present disclosure aims to provide a buffer member and an erection method that can suppress the reaction of a suspended load during erection and enhance safety.

Means for Solving the Problems

[0007] (1) The buffer member according to the present disclosure is a buffer member that supports the lower end of a suspended load when the suspended load is erected by a hoisting machine. The buffer member includes a first member and a second member that is placed on the first member and on which the lower end of the suspended load is placed. The second member is made of a material that is softer than the first member.

[0008] This buffer member includes a first member located below the second member and a second member on which the lower end of the suspended load is placed. The first member is harder than the second member. Therefore, since the first member can support the second member on which the suspended load is placed, safety can be enhanced. The second member placed on the first member is made of a material that is softer than the first member. Therefore, the second member on which the lower end of the suspended load is placed functions as a cushioning material during the erection of the suspended load. Thus, the reaction after the suspended load is erected so as to extend in the vertical direction can be suppressed, and the suspended load and the hoisting machine can be stabilized. As a result, the reaction of the suspended load during erection can be suppressed and safety can be enhanced.

[0009] (2) In the above (1), the second member may have a contact portion with which the suspended load to be erected comes into contact, and the contact portion may have an inclined surface that extends obliquely upward from the first member. In this case, by the suspended load to be erected coming into contact with the inclined surface, the cushioning property during erection can be enhanced. Therefore, it contributes to further improvement in safety.

[0010] (3) In the above (2), the second member may have a rigid portion located on the side opposite to the inclined surface in a plan view, and the rigid portion may be formed of a material harder than the portion other than the rigid portion of the second member. In this case, by providing the rigid portion, it is possible to prevent the second member from being excessively crushed when the suspended load abuts against the second member. Therefore, the erection of the suspended load can be performed more stably.

[0011] (4) In any of the above (1) to (3), the first member and the second member may be constituted by a closed-cell foam having a polyethylene resin as a base material. In this case, since the materials of the first member and the second member can be materials that are easy to obtain, the versatility of the buffer member can be enhanced.

[0012] (5) The erection method according to the present disclosure is an erection method for erecting a suspended load using the buffer member described above, and includes a step of abutting the lower end portion of the suspended load against the first member and the second member to erect the suspended load. Since this erection method uses the buffer member described above, it exhibits the same effects as the buffer member described above.

[0013] (6) In the above (5), the erection method may include a step of attaching a rotating jig to which a suspension wire is hooked to the suspended load before the step of erecting the suspended load, and a step of hooking the suspension wire to the rotating jig. The rotating jig may include a base fixed to the side surface of the suspended load facing the horizontal direction before the suspended load is erected, and a plate-shaped rotating portion rotatably attached to the base about an axis orthogonal to the side surface. In the step of hooking the suspension wire, the suspension wire may be hooked to a groove formed on the outer periphery of the rotating portion. In this case, the hoisting machine can hoist the suspended load with the suspension wire hooked to the groove of the rotating portion of the rotating jig. At this time, since the rotating portion rotates with respect to the suspended load, the hoisting can be easily performed.

[0014] (7) In the above (5) or (6), the suspended load may have a side surface facing vertically downward before being erected, a bottom surface facing vertically downward after being erected, and a hole recessed from the bottom surface. The erection method may include a step of attaching a curing member having a rod-shaped portion that covers the side surface and the bottom surface and enters the hole to the suspended load before the step of erecting the suspended load. In the step of erecting the suspended load, the suspended load may be erected with the rod-shaped portion of the curing member inserted into the hole and the side surface and the bottom surface covered by the curing member. In this case, since the side surface and the bottom surface of the suspended load are covered by the curing member when the suspended load is erected, the side surface and the bottom surface of the suspended load can be protected. Therefore, damage to the side surface and the bottom surface of the suspended load can be prevented.

Effect of the Invention

[0015] According to the present disclosure, the reaction of the suspended load during erection can be suppressed, and the safety can be enhanced.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

[0017] Hereinafter, embodiments of the buffer member and the erection method according to the present disclosure will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant descriptions are omitted as appropriate. The drawings may show some parts exaggerated or simplified for ease of understanding, and the dimensional ratios and the like are not limited to those described in the drawings.

[0018] FIG. 1 is a perspective view showing a buffer member 1 as an example according to the present embodiment. FIG. 2 is a diagram showing an example of use of the buffer member 1. As shown in FIGS. 1 and 2, the buffer member 1 is used, for example, when erecting a horizontally placed suspended load S. The suspended load S is a long member extending in one direction. The buffer member 1 supports the lower end portion S1 of the suspended load S when the suspended load S is erected by a hoisting machine. For example, the weight of the suspended load S is 10 (t) or more and 20 (t) or less. The length of the suspended load S is, for example, 5 (m) or more and 6 (m) or less.

[0019] The suspended load S is, for example, a concrete structure. As an example, the suspended load S is a PC column. The suspended load S is a concrete column prefabricated in a factory and is, for example, placed on the loading platform of a truck and transported to a construction site. The suspended load S has a plurality of holes S2 into which reinforcing bars extending from other columns are inserted. For example, since the shape, size, number and arrangement pattern of the holes S2 vary depending on the site, holes S2 having different shapes, sizes and numbers are created according to the site. The cross section when the suspended load S is cut in a cross section orthogonal to the longitudinal direction of the suspended load S is rectangular. The suspended load S is erected by hooking a wire rope on the suspended load S and being lifted by a hoisting machine such as a crane.

[0020] The suspended load S has a side surface S3 facing vertically downward before the suspended load S is erected, a side surface S4 facing horizontally before and after the suspended load S is erected, and a lower surface S5 facing vertically downward after the suspended load S is erected. For example, holes S2 are formed in each of the side surface S4 and the lower surface S5. In the hole S2 formed in the lower surface S5, for example, the main reinforcement bars of other columns are inserted.

[0021] The buffer member 1 includes a first member 11 and a second member 12 that is placed on the first member 11 and on which the lower end portion S1 of the suspended load S is placed. In the present embodiment, the buffer member 1 has a first member 11 that is rectangular in plan view and a second member 12 that is in the shape of a rectangular parallelepiped. For example, the buffer member 1 has one first member 11 and a plurality of second members 12.

[0022] The first member 11 has a long side 11b extending in a first direction D1 that is the longitudinal direction of the suspended load S before it is erected, a first short side 11c extending in a second direction D2 that is the width direction of the suspended load S, and a second short side 11d extending in a third direction D3 that is a direction intersecting both the first direction D1 and the second direction D2. The first direction D1, the second direction D2, and the third direction D3 are, for example, orthogonal to each other.

[0023] For example, the first member 11 is in the shape of a plate having a thickness in the third direction D3. The first member 11 has an upper surface 11f on which the second member 12 is placed. The upper surface 11f is defined by a pair of long sides 11b and a pair of first short sides 11c. As an example, the upper surface 11f is rectangular.

[0024] The second member 12 is, for example, rod-shaped. The second member 12 has a long side 12b extending in the first direction D1, a first short side 12c extending in the second direction D2, and a second short side 12d extending in the third direction D3. For example, the length of the second member 12 in the first direction D1 is shorter than the length of the first member 11 in the first direction D1, and the length of the second member 12 in the second direction D2 is shorter than the length of the first member 11 in the second direction D2. For example, the length of the second member 12 in the third direction D3 is longer than the length of the first member 11 in the third direction D3.

[0025] For example, on the upper surface 11f of the first member 11, a plurality (two in this example) of second members 12 are arranged along the second direction D2. In this case, since the lower end portion S1 of the suspended load S can be placed on the plurality of second members 12 arranged along the second direction D2, the erection of the suspended load S can be stabilized.

[0026] For example, the first member 11 and the second member 12 are each composed of a closed-cell foam with a polyethylene resin as the base material. As an example, the base material of the first member 11 is composed of low-density polyethylene (LDPE: Low Density Polyethylene). The resilience of the second member 12 is higher than that of the first member 11.

[0027] As an example, the color of the second member 12 is different from that of the first member 11. In this case, the first member 11 and the second member 12 can be made easier to visually recognize. For example, the apparent density of the first member 11 is smaller than that of the second member 12, and the tensile strength of the first member 11 is smaller than that of the second member 12. For example, the elongation of the first member 11 is smaller than that of the second member 12, and the compression stress of the first member 11 at 50% compression is larger than that of the second member 12.

[0028] As an example, the apparent density of the first member 11 is 60 (kg / m 3 ) and the tensile strength of the first member 11 is 0.82 (MPa), the elongation of the first member 11 is 175 (%), and the compression stress of the first member 11 at 50% compression is 280 (kPa). As an example, the apparent density of the second member 12 is 180 (kg / m 3 ) and the tensile strength of the second member 12 is 1.40 (MPa), the elongation of the second member 12 is 305 (%), and the compression stress of the second member 12 at 50% compression is 175 (kPa). The second member 12 is composed of a material that is softer than the first member 11. For example, the second member 12 is soft enough to be deformed by a finger, and the first member 11 is hard enough not to be deformed even when pressed by a finger.

[0029] FIG. 3 is a perspective view showing an example of the arrangement of the horizontally placed suspended load S. As shown in FIGS. 2 and 3, the buffer member 1 may have a third member 13 on which the second member 12 is placed at an adjacent position of the first member 11. For example, the third member 13 is an angle bar. In this case, the third member 13 is made of wood.

[0030] As an example, the length of the first member 11 in the first direction D1 is 1000 (mm), the length of the first member 11 in the second direction D2 is 1000 (mm), and the length of the first member 11 in the third direction D3 is 100 (mm). As an example, the length of the second member 12 in the first direction D1 is 1000 (mm), the length of the second member 12 in the second direction D2 is 250 (mm), and the length of the second member 12 in the third direction D3 is 200 (mm).

[0031] The third member 13 is arranged on the side opposite to the suspended load S as viewed from the first member 11. The third member 13 is provided to support the second member 12 on the side opposite to the suspended load S as viewed from the first member 11. For example, the hardness of the third member 13 is harder than that of the second member 12. In this case, excessive crushing of the second member 12 when the suspended load S is placed on the second member 12 can be suppressed, and the reaction at the time of erection of the suspended load S can be more reliably reduced.

[0032] For example, the suspended load S is in a state of floating from the installation surface M of the buffer member 1 by a plurality of placement members 14 extending in the second direction D2, and the first member 11 is inserted under the suspended load S floating from the installation surface M. The plurality of placement members 14 are arranged, for example, along the first direction D1. For example, the length of the first member 11 in the second direction D2 is longer than the length of the suspended load S in the second direction D2.

[0033] The first member 11 is arranged such that both end portions of the first member 11 in the second direction D2 are located on both end sides in the second direction D2 with respect to both end portions of the suspended load S in the second direction D2. The distance from the end of the first member 11 in the second direction D2 to the end of the suspended load S in the second direction D2 is, for example, 1 (cm). In this case, when the suspended load S is erected, the first member 11 will necessarily be positioned below the suspended load S, so that the erection can be stably performed and the occurrence of breakage in the buffer member 1 can be prevented.

[0034] Next, an example of the erection method according to the present embodiment will be described. Hereinafter, an example of erecting the suspended load S using the buffer member 1 including the first member 11, the second member 12, and the third member 13 will be described. First, as shown in FIGS. 4(a) and 4(b), the laid - down suspended load S is lifted by a hoist and the lower end portion S1 of the suspended load S is brought into contact with the first member 11 and the second member 12 to erect the suspended load S (the step of erecting the suspended load).

[0035] As shown in FIGS. 5(a) and 5(b), when the suspended load S is erected, the lower end portion S1 of the suspended load S rides up on the second member 12 and a part of the second member 12 deforms. Then, after continuing the erection until the longitudinal direction (first direction D1) of the suspended load S coincides with the vertical direction, a series of steps of the erection method is completed.

[0036] Next, the effects obtained from the buffer member 1 and the erection method according to the present embodiment will be described. The buffer member 1 includes the first member 11 located below the second member 12 and the second member 12 on which the lower end portion S1 of the suspended load S is placed. The first member 11 is harder than the second member 12. Therefore, the first member 11 can support the second member 12 on which the suspended load S is placed, so that the safety can be enhanced. Further, since the first member 11 is harder than the second member 12, it is possible to make it less likely for the first member 11 to be damaged even if the suspended load S rides up on the first member 11.

[0037] The second member 12 placed on the first member 11 is made of a material softer than the first member 11. Therefore, the second member 12 on which the lower end S1 of the suspended load S is placed functions as a cushioning material when the suspended load S is erected. Thus, it is possible to suppress the reaction after the suspended load S is erected so as to extend in the vertical direction, and it is possible to stabilize the suspended load S and the hoisting machine. As a result, it is possible to suppress the reaction of the suspended load S at the time of erection and enhance safety.

[0038] In the present embodiment, the first member 11 and the second member 12 may be constituted by a closed-cell foam having a polyethylene resin as a base material. In this case, since the materials of the first member 11 and the second member 12 can be materials that are easy to obtain, the versatility of the buffer member 1 can be enhanced.

[0039] The erecting method according to the present embodiment is an erecting method for erecting the suspended load S using the buffer member 1 described above, and includes a step of abutting the lower end S1 of the suspended load S against the first member 11 and the second member 12 to erect the suspended load S. Since this erecting method uses the buffer member 1 described above, it exhibits the same effects as the buffer member 1 described above.

[0040] Next, various modifications of the erecting method according to the present embodiment will be described. As shown in FIGS. 6, 7(a) and 7(b), for example, a rotating jig 20 is used when the suspended load S is erected. The rotating jig 20 is a hanging jig to which the ball hanging portion X2 of the hanging wire X1 extending from the hoisting machine X is attached.

[0041] The rotating jig 20 is attached to each of a pair of side surfaces S4 arranged along the second direction D2 (the direction perpendicular to the plane of FIG. 6) of the suspended load S. The rotating jig 20 is attached at a position closer to the column head portion S6 than the center in the first direction D1 of the suspended load S. However, the rotating jig 20 is not attached to the column head portion S6 of the suspended load S. For example, when the length of the suspended load S is 5 (m) or more and 6 (m) or less, the rotating jig 20 is attached at a position where the height of the suspended load S after being erected is 3 (m) or more and 4 (m) or less. In this case, after the suspended load S is erected, the rotating jig 20 can be removed from the suspended load S using a simple scaffold.

[0042] The rotating jig 20 has, for example, a base 21 fixed to the side surface S4 facing the horizontal direction before the suspended load S is erected, and a plate-shaped rotating portion 22 rotatably attached to the base 21 about an axis Z perpendicular to the side surface S4. For example, an insert is formed on the side surface S4, and a through hole communicating with the insert is formed in the base 21.

[0043] The base 21 is fixed to the side surface S4 by bolts passed through the through hole and screwed into the insert. The rotating portion 22 is rotatably attached to the base 21 by, for example, a mounting component 23. For example, the rotating portion 22 is made rotatable with respect to the base 21 and the mounting component 23 by attaching the mounting component 23 in a state of being sandwiched between the base 21 and the mounting component 23. The rotating portion 22 has a groove 22b on its outer periphery, and the ball hanging portion X2 of the suspension wire X1 is hooked in the groove 22b. Thereby, the suspension wire X1 is rotatably attached to the suspended load S.

[0044] A method of erecting a suspended load using a rotary jig 20 will be described. First, a rotary jig 20 to which a suspension wire X1 is hooked is attached to the suspended load S (step of attaching the rotary jig). As described above, the through hole of the base 21 is aligned with the insert provided on the side surface S4 of the suspended load S, and a bolt is passed through the through hole and screwed into the insert, thereby attaching the base 21 to the suspended load S. Then, the attachment part 23 is attached to the base 21 with the rotation part 22 sandwiched between the base 21 and the attachment part 23, so that the rotation part 22 is rotatably attached to the base 21.

[0045] Next, the suspension wire X1 is hooked to the rotary jig 20 (step of hooking the suspension wire). Specifically, the end of the suspension wire X1 is formed into an annular shape to form a loop part X2, and the loop part X2 is hooked to the groove 22b of the rotation part 22, thereby attaching the suspension wire X1 to the rotary jig 20. After attaching the rotary jig 20 and the suspension wire X1 to the rotary jig 20 to each of the pair of side surfaces S4 of the suspended load S as described above, the pair of suspension wires X1 are lifted by a hoist X.

[0046] After the suspended load S is erected in the same manner as described above, the rotary jig 20 is removed from the suspended load S (step of removing the rotary jig). When the rotary jig 20 is removed from the suspended load S, the above insert remains on the suspended load S. For example, a series of steps are completed after this insert is filled.

[0047] As described above, the erecting method in FIGS. 6, 7(a) and 7(b) includes a step of attaching a rotary jig 20 to which a suspension wire X1 is hooked to the suspended load S before the step of erecting the suspended load S, and a step of hooking the suspension wire X1 to the rotary jig 20. The rotary jig 20 has a base 21 fixed to the side surface S4 of the suspended load S facing the horizontal direction before the suspended load S is erected, and a plate-shaped rotation part 22 rotatably attached to the base 21 about an axis Z orthogonal to the side surface S4.

[0048] In the step of hooking the suspension wire X1, the suspension wire X1 is hooked on a groove 22b formed on the outer periphery of the rotating part 22. In this case, the hoist X can lift the suspended load S with the suspension wire X1 hooked on the groove 22b of the rotating part 22 of the rotary jig 20. At this time, since the rotating part 22 rotates with respect to the suspended load S, lifting can be easily performed.

[0049] As shown in FIGS. 8(a) and 8(b), a curing member 30 may be used when the suspended load S is erected. The curing member 30 includes a first covering portion 31 that covers a side surface S3 facing vertically downward before the suspended load S is erected, a second covering portion 32 that covers a lower surface S5 facing vertically downward after the suspended load S is erected, and a rod-shaped portion 33 that enters a hole S2 recessed from the lower surface S5.

[0050] The first covering portion 31 has, for example, a first contact portion 31b that contacts the side surface S3 and a first plate portion 31c that is located on the side opposite to the side surface S3 when viewed from the first contact portion 31b. The second covering portion 32 has, for example, a second contact portion 32b that contacts the lower surface S5 and a second plate portion 32c that is located on the side opposite to the lower surface S5 when viewed from the second contact portion 32b. The first plate portion 31c and the second plate portion 32c are connected to each other and form an L shape. The rod-shaped portion 33 protrudes from the surface of the second plate portion 32c where the second contact portion 32b is provided. The hole S2 into which the rod-shaped portion 33 enters is, for example, a hole for inserting a sleeve of a mechanical joint of the main reinforcement in the PC column when the suspended load S is erected and constructed.

[0051] The erection method when using the curing member 30 will be described. First, cover the side surface S3 with the first covering portion 31, cover the lower surface S5 with the second covering portion 32, and insert the rod-shaped portion 33 into the hole S2 to attach the curing member 30 to the suspended load S (step of attaching the curing member to the suspended load). Then, with the rod-shaped portion 33 inserted into the hole S2, the first covering portion 31 covering the side surface S3, and the second covering portion 32 covering the lower surface S5, the suspended load S is erected in the same manner as described above (step of erecting the suspended load). Then, the suspended load S is lifted vertically upward and the rod-shaped portion 33 is removed from the hole S2, thereby removing the curing member 30 from the suspended load S, and a series of steps are completed.

[0052] As described above, the erection method in FIG. 8 includes a step of attaching a curing member 30 having a rod-shaped portion 33 that covers the side surface S3 and the lower surface S5 and enters the hole S2 to the suspended load S before the step of erecting the suspended load S. In the step of erecting the suspended load S, the rod-shaped portion 33 of the curing member 30 is inserted into the hole S2, and the suspended load S is erected in a state where the side surface S3 and the lower surface S5 are covered by the curing member 30. In this case, since the side surface S3 and the lower surface S5 of the suspended load S are covered by the curing member 30 when the suspended load S is erected, the side surface S3 and the lower surface S5 of the suspended load S can be protected. Therefore, damage to the side surface S3 and the lower surface S5 of the suspended load S can be prevented.

[0053] Next, the buffer member 40 according to the modified example will be described with reference to FIG. 9. The buffer member 40 includes a first member 41 and a second member 42 placed on the first member 41. The first member 41 is plate-shaped, similar to the first member 11 described above. For example, the length of the first member 41 in the first direction D1 is 1500 (mm), and the length (thickness) of the first member 41 in the third direction D3 is 80 (mm).

[0054] The second member 42 has a contact portion 42b against which the suspended load S to be erected abuts. The contact portion 42b has an inclined surface 42c extending obliquely upward from the first member 41 and an upper surface 42g extending along the first direction D1 from the upper end of the inclined surface 42c. The second member 42 has a soft portion 42d including the inclined surface 42c, a hard portion 42f located on the side opposite to the inclined surface 42c in plan view, an upper hard portion 42h constituting the upper surface 42g, and a lower hard portion 42j located below the soft portion 42d and the hard portion 42f.

[0055] The angle of the inclined surface 42c with respect to the horizontal plane is, for example, 30° or more and 60° or less (45° as an example). The soft portion 42d is exposed on the inclined surface 42c. The soft portion 42d is made of a material softer than the upper hard portion 42h and the lower hard portion 42j. The hard portion 42f is made of a material harder than the other portions of the second member 42 except for the hard portion 42f.

[0056] For example, the hard portion 42f is made of a material harder than the upper hard portion 42h and the lower hard portion 42j. For example, the upper hard portion 42h is made of the same material as the lower hard portion 42j. However, the upper hard portion 42h may be made of a material different from that of the lower hard portion 42j, and the materials of the upper hard portion 42h and the lower hard portion 42j are not particularly limited.

[0057] As an example, the length in the first direction D1 of the upper hard portion 42h is 700 (mm), and the length in the first direction D1 of the lower hard portion 42j is 1000 (mm). The length in the first direction D1 of the second member 42 is shorter than the length in the first direction D1 of the first member 41. The length (thickness) in the third direction D3 of the second member 42 is, for example, longer than the length in the third direction D3 of the first member 41. As an example, the length in the third direction D3 of the second member 42 is 300 (mm).

[0058] Next, a method for erecting a suspended load S using the buffer member 40 will be described with reference to Fig. 10(a) to Fig. 10(e). First, as shown in Fig. 10(a), the buffer member 40 is placed on the installation surface M. At this time, a part of the first member 41 is inserted under the suspended load S, which is laid on a plurality of mounting members 14 and suspended above the installation surface M (step of inserting a part of the first member).

[0059] For example, since the height of the mounting member 14 is 100 (mm) and the height (thickness) of the first member 41 is 80 (mm), it is possible to insert the first member 41 under the suspended load S. With a part of the first member 41 inserted under the suspended load S, the second member 42 is placed on the first member 41 (step of placing the second member on the first member).

[0060] Then, the hoisting wire X1 of the lifting machine X is slinged at a position closer to the column head S6 than the center of gravity of the load S (slinging process). At this time, as described above, the rotating jig 20 may be attached to the side surface S4, and the sling part X2 of the hoisting wire X1 may be attached to the rotating jig 20. Furthermore, the aforementioned covering member 30 may be attached to the lower end S1 of the load S.

[0061] After the slinging of the hoisting wire X1, the lifting machine X pulls the hoisting wire X1 upward to hoist the load S (the step of hoisting the load), as shown in Figures 10(b) and 10(c). At this time, the lower end S1 of the load S abuts against the abutment portion 42b of the second member 42, compressing the second member 42, and substantially the entire lower end S1 of the load S rides on the second member 42.

[0062] 10(d) and 10(e), the load S is raised up until the center of gravity line S7 of the load S extends vertically, at which time the second member 42 is compressed by about 80 mm. After that, when the longitudinal direction of the load S coincides with the vertical direction, for example, the second member 42 is compressed by about 100 mm.

[0063] If the buffer member 40 were not present, the center of gravity line S7 of the load S would extend vertically, and a reaction (a movement of the load S swinging to the right in FIG. 10(e) from the vertical) would occur when the load S is erected. In contrast, if the buffer member 40 is present, a frictional force will act between the lower end S1 of the load S and the second member 42 in the process of erecting the load S on the second member 42. Therefore, the reaction of the load S when it is erected can be suppressed.

[0064] As described above, when erecting the load S using the buffer member 40 according to the modified example, the second member 42 on which the lower end S1 of the load S is placed functions as a cushioning material when erecting the load S. Therefore, similar to the case where the buffer member 1 is used, it is possible to suppress the recoil after the load S is erected so as to extend vertically, and it is possible to stabilize the load S and the lifting machine X.

[0065] Furthermore, the second member 42 has an abutment portion 42b against which the load S to be erected abuts, and the abutment portion 42b has an inclined surface 42c that extends obliquely upward from the first member 41. In this case, the load S to be erected abuts against the inclined surface 42c, thereby improving cushioning during erection. This contributes to further improving safety.

[0066] As described above, the second member 42 has a hard portion 42f located on the side opposite to the inclined surface 42c in plan view, and the hard portion 42f is made of a material harder than the portions of the second member 42 other than the hard portion 42f. In this case, by providing the hard portion 42f, it is possible to prevent the second member 42 from being overly crushed when the suspended load S abuts against the second member 42. Therefore, the erection of the suspended load S can be performed more stably.

[0067] As described above, the embodiments and various modifications of the buffer member and the erection method according to the present disclosure have been described. However, the buffer member and the erection method according to the present disclosure are not limited to the above-described embodiments or modifications, and may be further modified within the scope of the gist described in the claims. That is, the functions, shapes, sizes, materials, numbers, and arrangement modes of the respective parts of the buffer member, as well as the contents and orders of the steps of the erection method, can be appropriately changed within the scope of the above gist.

[0068] For example, in the above-described embodiments and modifications, the erection method using the buffer member 1, the erection method using the rotary jig 20, the erection method using the curing member 30, and the erection method using the buffer member 40 have been described. The buffer member according to the present disclosure may be a combination of a part of the buffer member 1 and a part of the buffer member 40. The erection method according to the present disclosure may be a combination of at least any one of the method using the buffer member 1, the method using the rotary jig 20, the method using the curing member 30, and the method using the buffer member 40.

[0069] For example, in the above-described embodiment, the buffer member 1 including the first member 11 and the second member 12 made of a closed-cell foam with a polyethylene resin as a base material has been described. However, the materials of the first member and the second member are not limited to the above-described examples and can be appropriately changed.

[0070] In the above-mentioned modified example, the second member 42 having the inclined surface 42c, the soft portion 42d, the hard portion 42f, the upper hard portion 42h, and the lower hard portion 42j has been described. However, the second member may not have at least any of the inclined surface 42c, the soft portion 42d, the hard portion 42f, the upper hard portion 42h, and the lower hard portion 42j. In this way, the structure of the second member can be appropriately changed. The same applies to the first member. [Explanation of symbols]

[0071] REFERENCE SIGNS LIST 1...buffer member, 11...first member, 11b...long side, 11c...first short side, 11d...second short side, 11f...top surface, 12...second member, 12b...long side, 12c...first short side, 12d...second short side, 13...third member, 14...mounting member, 20...rotating jig, 21...base, 22...rotating portion, 22b...groove, 23...mounting part, 30...covering member, 31...first covering portion, 31b...first contact portion, 31c...first plate portion, 32...second covering portion, 32b...second contact portion, 32c...second plate Part, 33... Rod-shaped part, 40... Buffer member, 41... First member, 42... Second member, 42b... Contact part, 42c... Inclined surface, 42d... Soft part, 42f... Hard part, 42g... Top surface, 42h... Upper hard part, 42j... Lower hard part, D1... First Direction, D2...second direction, D3...third direction, M...installation surface, S...hanging load, S1...bottom end, S2...hole, S3, S4...side, S5...bottom surface, S6...column head, S7...center of gravity, X...lifting machine, X1...hanging wire, X2...sling section, Z...axis.

Claims

1. A buffer member that supports the lower end of a suspended load when the suspended load is lifted by a hoisting machine, a first member, a second member that is placed on the first member and on which the lower end of the suspended load is placed, comprising: the second member is made of a material softer than the first member, the first member and the second member are made of a closed-cell foam with a polyethylene resin as a base material, the first member has a long side extending in a first direction that is the longitudinal direction of the suspended load before being lifted, a first short side extending in a second direction that is the width direction of the suspended load, and a second short side extending in a third direction that intersects both the first direction and the second direction, the second member is rod-shaped, a plurality of the second members are arranged along the second direction on the upper surface of the first member, buffer member.

2. A buffer member that supports the lower end of a suspended load when the suspended load is lifted by a hoisting machine, a first member, a second member that is placed on the first member and on which the lower end of the suspended load is placed, comprising: the second member is made of a material softer than the first member, the first member and the second member are made of a closed-cell foam with a polyethylene resin as a base material, the buffer member has a third member, which is an angle member on which the second member is placed at an adjacent position of the first member, the third member is provided to support the second member on the side opposite to the suspended load when viewed from the first member, the hardness of the third member is harder than the hardness of the second member, buffer member.

3. the second member has a contact portion with which the suspended load in the lifted state comes into contact, the contact portion has an inclined surface extending obliquely upward from the first member, the buffer member according to claim 1 or claim 2.

4. the second member has a hard portion located on the side opposite to the inclined surface in a plan view, the hard portion is made of a material harder than the other portions of the second member, the buffer member according to claim 3.

5. A lifting method of lifting a suspended load using the buffer member according to claim 1 or claim 2, comprising a step of bringing the lower end of the suspended load into contact with the upper surface of the first member to lift the suspended load, lifting method.

6. Before the step of lifting the suspended load, a step of attaching a rotary jig to which a suspension wire is hooked to the suspended load, a step of hooking the suspension wire on the rotary jig; comprising; the rotary jig has a base fixed to a side surface of the suspended load facing in the horizontal direction before the suspended load is erected, and a plate-shaped rotating portion rotatably attached to the base about an axis orthogonal to the side surface; in the step of hooking the suspension wire, the suspension wire is hooked in a groove formed on the outer periphery of the rotating portion; The erecting method according to claim 5.

7. the suspended load has a side surface facing vertically downward before being erected, a lower surface facing vertically downward after being erected, and a hole recessed from the lower surface; before the step of erecting the suspended load, a step of attaching a curing member having a rod-shaped portion that covers the side surface and the lower surface and enters the hole to the suspended load is provided; in the step of erecting the suspended load, the suspended load is erected with the rod-shaped portion of the curing member inserted into the hole and the side surface and the lower surface covered by the curing member; The erecting method according to claim 5.

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