Buffer member and erection method

Abstract

To provide a buffer member and an erection method capable of enhancing safety by suppressing reaction of a suspended cargo in erection.SOLUTION: The cushioning member according to one embodiment is a cushioning member 1 that supports the S1 of the lower end of a 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 which is placed on the first member 11 and on which the lower end S1 of the suspended load S is placed. The second member 12 is made of a material softer than the first member 11.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a buffer member used when erecting a suspended load, and an erection method. [Background technology]

[0002] Patent Document 1 describes a dual-purpose lifting jig used when erecting a column. The dual-purpose lifting jig has an eyebar, a disk-shaped base material with a screw hole for fixing formed on one side, and a base cover that covers the base material. The precast concrete column has screw holes. The base material is fixed to the precast concrete column with bolts.

[0003] The eyebar has a ring-shaped portion that is sandwiched between the base material and the base cover. The ring-shaped portion is rotatable relative to the base material and the base cover when the eyebar is attached to the precast concrete column. The eyebar has a shackle at the end opposite the ring-shaped portion to which a lifting machine hook can be attached. The hook is hooked onto the shackle and the lifting machine pulls up the eyebar, erecting the precast concrete column. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-191477 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when erecting a suspended load such as the precast concrete column described above, a reaction may occur after the suspended load is erected so as to extend vertically. This reaction may cause the load and the lifting machine to become unstable. Therefore, there is room for improvement in safety during erection work.

[0006] The present disclosure aims to provide a buffer member and an erection method that can suppress the recoil of a suspended load when erecting it and increase safety. [Means for solving the problem]

[0007] (1) The cushioning member according to the present disclosure is a cushioning member that supports the lower end of a suspended load when the load is erected by a crane. The cushioning 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 rests. The second member is made of a material that is softer than the first member.

[0008] This buffer member comprises a first member located below the second member and a second member on which the lower end of the suspended load rests. The first member is harder than the second member. Therefore, the first member can support the second member on which the suspended load rests, thereby increasing safety. The second member placed on the first member is made of a softer material than the first member. Therefore, the second member on which the lower end of the suspended load rests functions as a cushioning material when the load is erected. This makes it possible to suppress recoil after the load is erected so that it extends vertically, thereby stabilizing the load and the lifting machine. As a result, recoil of the suspended load during erection can be suppressed, increasing safety.

[0009] (2) In the above (1), the second member may have an abutment portion against which the load being erected abuts, and the abutment portion may have an inclined surface extending obliquely upward from the first member. In this case, the load being erected abuts against the inclined surface, thereby improving cushioning during erection. This contributes to further improving safety.

[0010] (3) In the above (2), the second member may have a hard portion located on the opposite side of the inclined surface in a plan view, and the hard portion may be made of a material harder than the remaining portions of the second member. In this case, the provision of the hard portion prevents the second member from being crushed too much when the suspended load contacts the second member. Therefore, the suspended load can be erected more stably.

[0011] (4) In any of the above (1) to (3), the first and second members may be made of closed-cell foam with a polyethylene resin as the base material. In this case, the first and second members can be made of readily available materials, thereby increasing the versatility of the cushioning member.

[0012] (5) The erection method according to the present disclosure is a method for erecting a suspended load using the aforementioned buffer member, and includes a step of erecting the suspended load by abutting the lower end of the suspended load against the first member and the second member. This erection method uses the aforementioned buffer member, and therefore has the same effect as the aforementioned buffer member.

[0013] (6) In the above (5), the erection method may include, before the step of erecting the load, a step of attaching a rotating jig to the load, to which the lifting wire is hooked, and a step of hooking the lifting wire onto the rotating jig. The rotating jig may have a base fixed to a side of the load that faces horizontally before the load is erected, and a plate-shaped rotating part attached to the base so as to be rotatable about an axis perpendicular to the side. In the step of hooking the lifting wire, the lifting wire may be hooked into a groove formed on the outer periphery of the rotating part. In this case, the lifting machine can lift the load with the lifting wire hooked into the groove in the rotating part of the rotating jig. At this time, the rotating part rotates relative to the load, making lifting easy.

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

[0015] According to the present disclosure, the recoil of the suspended load when erecting it can be suppressed, thereby increasing safety. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view showing a cushioning member according to an embodiment. [Figure 2] FIG. 2 is a diagram showing an example of the arrangement of the buffer members according to the embodiment. [Figure 3] FIG. 3 is a view of the example of the arrangement of FIG. 2 as seen from a different direction than that of FIG. [Figure 4] 4(a) and 4(b) are diagrams showing steps of the erection method according to this embodiment. [Figure 5] 5(a) and 5(b) are diagrams showing steps of the erection method according to this embodiment. [Figure 6] FIG. 6 is a diagram showing a rotating jig attached to the side of a suspended load. [Figure 7] 7(a) and 7(b) are diagrams for explaining a method of erecting using the rotary jig of FIG. [Figure 8] 8(a) and 8(b) are diagrams showing the curing member attached to the suspended load. [Figure 9]FIG. 9 is a diagram showing a buffer member according to a modified example. [Figure 10] 10(a), 10(b), 10(c), 10(d) and 10(e) are diagrams showing steps of an erection method using a buffer member according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the buffer member and 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 designated by the same reference numerals, and duplicate explanations will be omitted as appropriate. The drawings may be partially exaggerated or simplified for ease of understanding, and the dimensional proportions and the like are not limited to those shown in the drawings.

[0018] FIG. 1 is a perspective view showing an example of a buffer member 1 according to this embodiment. FIG. 2 is a diagram showing an example of how the buffer member 1 is used. As shown in FIGS. 1 and 2, the buffer member 1 is used, for example, when erecting a suspended load S that is lying down. The load S is a long member that extends long in one direction. The buffer member 1 supports the lower end S1 of the suspended load S when the suspended load S is erected by a crane. 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 load S is, for example, a concrete structure. As an example, the load S is a PC pillar. The load S is a concrete pillar prefabricated in a factory and is transported to a construction site, for example, on the back of a truck. The load S has multiple holes S2 into which rebar extending from other pillars is inserted. For example, the shape, size, number, and arrangement of the holes S2 vary depending on the construction site, so holes S2 of different shapes, sizes, and numbers are created depending on the construction site. When the load S is cut at a cross section perpendicular to the longitudinal direction of the load S, the cross section is rectangular. The load S is erected by slinging a wire rope around the load S and then being pulled up by a lifting machine such as a crane.

[0020] The load S has a side surface S3 that faces vertically downward before the load S is erected, a side surface S4 that faces horizontally before and after the load S is erected, and a bottom surface S5 that faces vertically downward after the load S is erected. For example, holes S2 are formed in each of the side surface S4 and the bottom surface S5. For example, main reinforcement of another column is inserted into the holes S2 formed in the bottom surface S5.

[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 S1 of the suspended load S is placed. In this embodiment, the buffer member 1 has the first member 11 that is rectangular in a plan view and the second member 12 that is rectangular parallelepiped in shape. For example, the buffer member 1 has one first member 11 and multiple second members 12.

[0022] The first member 11 has a long side 11b extending in a first direction D1, which is the longitudinal direction of the load S before it is erected, a first short side 11c extending in a second direction D2, which is the width direction of the load S, and a second short side 11d extending in a third direction D3, which 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, perpendicular to one another.

[0023] For example, the first member 11 is plate-shaped and has 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 a first direction D1, a first short side 12c extending in a second direction D2, and a second short side 12d extending in a 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, a plurality of (for example, two) second members 12 are lined up along the second direction D2 on the upper surface 11f of the first member 11. In this case, the lower end portion S1 of the load S can be placed on the plurality of second members 12 lined up along the second direction D2, so that the erection of the load S can be stabilized.

[0026] For example, the first member 11 and the second member 12 are made of a closed-cell foam body with a polyethylene resin as a base material. As an example, the base material of the first member 11 is made of low-density polyethylene (LDPE). The second member 12 has a higher resilience than the first member 11.

[0027] As an example, the color of the second member 12 is different from the color of the first member 11. In this case, the first member 11 and the second member 12 can be easily seen. For example, the apparent density of the first member 11 is smaller than the apparent density of the second member 12, and the tensile strength of the first member 11 is smaller than the tensile strength of the second member 12. For example, the elongation of the first member 11 is smaller than the elongation of the second member 12, and the compressive stress of the first member 11 is larger than the compressive stress of the second member 12.

[0028] As an example, the apparent density of the first member 11 is 60 (kg / m 3 ), the tensile strength of the first member 11 is 0.82 (MPa), the elongation of the first member 11 is 175 (%), and the compressive stress of the first member 11 when compressed by 50% is 280 (kPa). As an example, the apparent density of the second member 12 is 180 (kg / m 3 ), the tensile strength of the second member 12 is 1.40 (MPa), the elongation of the second member 12 is 305 (%), and the compressive stress of the second member 12 when compressed by 50% is 175 (kPa). The second member 12 is made 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 when pressed by a finger.

[0029] Fig. 3 is a perspective view showing an example of the arrangement of a 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 adjacent to the first member 11. For example, the third member 13 is a piece of timber. 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 disposed on the opposite side of the load S from the first member 11. The third member 13 is provided to support the second member 12 on the opposite side of the load S from the first member 11. For example, the hardness of the third member 13 is harder than the hardness of the second member 12. In this case, excessive crushing of the second member 12 when the load S is placed on the second member 12 is suppressed, and the recoil when the load S is erected can be more reliably reduced.

[0032] For example, the load S is suspended above the installation surface M of the buffer member 1 by a plurality of mounting members 14 extending in the second direction D2, and the first member 11 is inserted below the suspended load S suspended above the installation surface M. The plurality of mounting members 14 are, for example, lined up 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 so that both ends of the first member 11 in the second direction D2 are located closer to both ends in the second direction D2 than both ends of the 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 load S in the second direction D2 is, for example, 1 cm. In this case, when the load S is erected, the first member 11 is always located below the load S, so that the erection can be performed stably and tears in the buffer member 1 can be prevented.

[0034] Next, an example of an erection method according to this embodiment will be described. An example of erecting a suspended load S using a buffer member 1 including a first member 11, a second member 12, and a third member 13 will be described below. First, as shown in Figures 4(a) and 4(b), the suspended load S is lifted up by a crane and the lower end S1 of the suspended load S is brought into contact with the first member 11 and the second member 12, thereby erecting the suspended load S (step of erecting the suspended load).

[0035] 5(a) and 5(b), when the load S is erected, the lower end S1 of the load S rides up onto the second member 12, causing a portion of the second member 12 to deform. Then, as the erection continues, the longitudinal direction (first direction D1) of the load S becomes aligned with the vertical direction, and the series of steps in the erection method is then completed.

[0036] Next, the effects obtained from the buffer member 1 and erection method according to this embodiment will be described. The buffer member 1 comprises a first member 11 located below the second member 12, and the second member 12 on which the lower end 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, thereby improving safety. Furthermore, because the first member 11 is harder than the second member 12, damage to the first member 11 is less likely to occur even if the suspended load S runs over the first member 11.

[0037] The second member 12, which is placed on the first member 11, is made of a softer material than the first member 11. Therefore, the second member 12, on which the lower end S1 of the load S is placed, functions as a cushioning material when the load S is erected. This makes it possible to suppress the recoil of the load S after it has been erected so that it extends vertically, thereby stabilizing the load S and the lifting machine. As a result, the recoil of the load S when erecting it can be suppressed, thereby increasing safety.

[0038] In this embodiment, the first member 11 and the second member 12 may be made of a closed-cell foam with a polyethylene resin as the base material. In this case, the first member 11 and the second member 12 can be made of a material that is easily available, thereby increasing the versatility of the cushioning member 1.

[0039] The erection method according to this embodiment is a method for erecting a suspended load S using the buffer member 1 described above, and includes a step of erecting the suspended load S by abutting the lower end S1 of the suspended load S against the first member 11 and the second member 12. This erection method uses the buffer member 1 described above, and therefore has the same effect as the buffer member 1 described above.

[0040] Next, various modified examples of the erection method according to this embodiment will be described. As shown in Figures 6, 7(a) and 7(b), for example, a rotating jig 20 is used when erecting a load S. The rotating jig 20 is a lifting jig to which a sling portion X2 of a lifting wire X1 extending from a lifting machine X is attached.

[0041] The rotating jig 20 is attached to each of a pair of side surfaces S4 of the load S that are aligned in the second direction D2 (a direction perpendicular to the plane of the paper in FIG. 6). The rotating jig 20 is attached to a position closer to the column capital S6 than the center of the load S in the first direction D1. However, the rotating jig 20 is not attached to the column capital S6 of the load S. For example, if the length of the load S is 5 m or more and 6 m or less, the rotating jig 20 is attached to a position where the height of the load S after erection will be 3 m or more and 4 m or less. In this case, after erecting the load S, the rotating jig 20 can be detached from the load S using simple scaffolding.

[0042] The rotating jig 20 has, for example, a base 21 fixed to a side surface S4 that faces horizontally before the load S is erected, and a plate-shaped rotating part 22 attached to the base 21 so as to be rotatable about an axis Z that is perpendicular to the side surface S4. For example, an insert is formed on the side surface S4, and a through-hole that communicates with the insert is formed in the base 21.

[0043] The base 21 is fixed to the side surface S4 by a bolt that is passed through the through hole and screwed into the insert. The rotating part 22 is rotatably attached to the base 21 by, for example, an attachment part 23. For example, the attachment part 23 is attached while the rotating part 22 is sandwiched between the base 21 and the attachment part 23, thereby making the rotating part 22 rotatable relative to the base 21 and the attachment part 23. The rotating part 22 has a groove 22b on its outer periphery, and the sling part X2 of the lifting wire X1 is hooked into the groove 22b. In this way, the lifting wire X1 is rotatably attached to the load S.

[0044] A method of erecting the load using the rotating jig 20 will be described. First, the rotating jig 20, to which the hoisting wire X1 is hooked, is attached to the load S (step of attaching the rotating jig). As described above, the base 21 is attached to the load S by aligning the through-hole of the base 21 with the insert provided on the side surface S4 of the load S, passing a bolt through the through-hole, and screwing the bolt into the insert. Thereafter, the attachment part 23 is attached to the base 21 with the rotating part 22 sandwiched between the base 21 and the attachment part 23, thereby attaching the rotating part 22 to be rotatable relative to the base 21.

[0045] Next, the hoisting wire X1 is hooked onto the rotating jig 20 (step of hooking the hoisting wire). Specifically, the end of the hoisting wire X1 is looped to form a sling portion X2, and the sling portion X2 is hooked into the groove 22b of the rotating portion 22, thereby attaching the hoisting wire X1 to the rotating jig 20. After the rotating jig 20 and the hoisting wire X1 are attached to each of the pair of side surfaces S4 of the load S, the pair of hoisting wires X1 are lifted up by the crane X.

[0046] Then, after erecting the load S in the same manner as described above, the rotating jig 20 is removed from the load S (step of removing the rotating jig). When the rotating jig 20 is removed from the load S, the insert remains in the load S. For example, after the insert is buried, the series of steps is completed.

[0047] 6, 7(a), and 7(b) includes, before the step of erecting the load S, the step of attaching the rotating jig 20, to which the hoisting wire X1 is hooked, to the load S, and the step of hooking the hoisting wire X1 to the rotating jig 20. The rotating jig 20 has a base 21 fixed to the side surface S4 of the load S, which faces horizontally before the load S is erected, and a plate-shaped rotating part 22 attached to the base 21 so as to be rotatable about an axis Z perpendicular to the side surface S4.

[0048] In the process of hooking the hoisting wire X1, the hoisting wire X1 is hooked into the groove 22b formed on the outer periphery of the rotating part 22. In this case, the lifting machine X can lift the load S in a state in which the hoisting wire X1 is hooked into the groove 22b of the rotating part 22 of the rotating jig 20. At this time, the rotating part 22 rotates relative to the load S, making it easy to lift the load.

[0049] 8(a) and 8(b), a curing member 30 may be used when erecting a suspended load S. The curing member 30 has a first covering portion 31 that covers the side surface S3 that faces vertically downward before the suspended load S is erected, a second covering portion 32 that covers the bottom surface S5 that faces vertically downward after the suspended load S is erected, and a rod-shaped portion 33 that fits into a hole S2 recessed from the bottom 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 located on the opposite side of the side surface S3 from the first contact portion 31b. The second covering portion 32 has, for example, a second contact portion 32b that contacts the bottom surface S5 and a second plate portion 32c located on the opposite side of the bottom surface S5 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 for the main reinforcement of 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, the side surface S3 is covered with the first covering portion 31, the bottom surface S5 is covered with the second covering portion 32, and the rod-shaped portion 33 is inserted 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 suspended load S is erected in the same manner as described above with the first covering portion 31 covering the side surface S3 and the second covering portion 32 covering the bottom surface S5 (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, completing the series of steps.

[0052] As described above, the erection method in Figure 8 includes a step of attaching to the suspended load S a covering member 30 that covers the side surface S3 and the underside S5 and has a rod-shaped portion 33 that fits into the hole S2, 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 covering member 30 is inserted into the hole S2, and the suspended load S is erected with the side surface S3 and the underside S5 covered by the covering member 30. In this case, because the side surface S3 and the underside S5 of the suspended load S are covered by the covering member 30 when the suspended load S is erected, the side surface S3 and the underside S5 of the suspended load S can be protected. Therefore, damage to the side surface S3 and the underside S5 of the suspended load S can be prevented.

[0053] Next, a buffer member 40 according to a 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 contacts. The contact portion 42b has an inclined surface 42c extending diagonally upward from the first member 41, and an upper surface 42g extending from the upper end of the inclined surface 42c along the first direction D1. The second member 42 has a soft portion 42d including the inclined surface 42c, a hard portion 42f located on the opposite side from the inclined surface 42c in a plan view, an upper hard portion 42h that constitutes 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 that is softer than the upper hard portion 42h and the lower hard portion 42j. The hard portion 42f is made of a material that is harder than the portions of the second member 42 other than 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 different material from 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 longer than the length in the third direction D3 of the first member 41, for example. 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 Figures 10(a) to 10(e). First, as shown in Figure 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 portion 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 portion X2 of the hoisting wire X1 may be attached to the rotating jig 20. Furthermore, the aforementioned protective member 30 may be attached to the lower end portion S1 of the load S.

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

[0062] 10(d) and 10(e), the load S is raised until the center of gravity line S7 of the load S extends vertically, at which time the second member 42 is compressed by approximately 80 mm. After that, when the longitudinal direction of the load S is aligned with the vertical direction, the second member 42 is compressed by, for example, approximately 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 recoil of the load S (a movement of the load 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 during the process of erecting the load S on the second member 42. Therefore, the recoil 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 a contact portion 42b against which the load S being erected comes into contact, and the contact portion 42b has an inclined surface 42c that extends obliquely upward from the first member 41. In this case, the load S being erected comes into contact with the inclined surface 42c, thereby improving cushioning during erection, thereby contributing to further improved safety.

[0066] As described above, the second member 42 has a hard portion 42f located on the opposite side from the inclined surface 42c in a plan view, and the hard portion 42f is made of a material that is harder than the other portions of the second member 42. In this case, the provision of the hard portion 42f makes it possible to prevent the second member 42 from being crushed too much when the load S comes into contact with the second member 42. Therefore, the load S can be erected more stably.

[0067] The above describes embodiments and various modifications of the cushioning member and erection method according to the present disclosure. However, the cushioning member and 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. In other words, the function, shape, size, material, number, and arrangement of each part of the cushioning member, as well as the content and order of the steps of the erection method, may be modified as appropriate within the scope of the above-described gist.

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

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

[0070] In the above-described modified example, the second member 42 has the inclined surface 42c, the soft portion 42d, the hard portion 42f, the upper hard portion 42h, and the lower hard portion 42j. However, the second member may not have at least one 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 modified as appropriate. The same applies to the first member. [Explanation of symbols]

[0071] 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...Placement member, 20...Rotating jig, 21...Base, 22...Rotating portion, 22b...Groove, 23...Mounting part, 30...Protective 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... Upper 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 erected by a lifting machine, A first member; a second member that is placed on the first member and on which a lower end of the suspended load is placed; Equipped with The second member is made of a material softer than the first member. Cushioning material.

2. The second member has a contact portion with which the suspended load to be erected contacts, The abutment portion has an inclined surface extending obliquely upward from the first member. The cushioning member according to claim 1 .

3. the second member has a hard portion located on the opposite side to the inclined surface in a plan view, The hard portion is made of a material harder than a portion of the second member other than the hard portion. The cushioning member according to claim 2 .

4. The first member and the second member are made of a closed-cell foam body having a polyethylene resin as a base material. The cushioning member according to claim 1 .

5. A method for erecting a suspended load using the buffer member according to any one of claims 1 to 4, a step of erecting the load by bringing a lower end of the load into contact with the first member and the second member, How to build it.

6. Before the step of erecting the load, A step of attaching a rotating jig to the suspended load, to which a suspension wire is hooked; a step of hooking the hanging wire onto the rotating jig; Equipped with The rotating jig has a base that is fixed to a side surface of the suspended load that faces horizontally before the suspended load is erected, and a plate-shaped rotating part that is attached to the base so as to be rotatable around an axis perpendicular to the side surface, In the step of hooking the suspension wire, the suspension wire is hooked into a groove formed on the outer periphery of the rotating part. The erection method according to claim 5.

7. The suspended load has 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, a step of attaching a curing member to the suspended load, the curing member covering the side and bottom surfaces and having a rod-shaped portion that fits into the hole, before the step of erecting the suspended load; In the step of erecting the suspended load, the rod-shaped portion of the curing member is inserted into the hole, and the suspended load is erected in a state in which the side surface and the bottom surface are covered with the curing member. The erection method according to claim 5.

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