Steel plate inversion method

Abstract

To provide a method for inverting a steel plate by lifting it at two points. [Solution] The steel plate inversion method comprises a lifting step of lifting one side and the other side of the steel plate in a predetermined direction, and an inversion step of inverting the steel plate that was lifted in the lifting step.

Description

Technical Field

[0001] The present disclosure relates to a method for inverting a steel plate.

Background Art

[0002] Conventionally, there has been a technique for inverting a heavy metal plate such as a steel plate. Patent Document 1 discloses a jig for plate inversion used when lifting an end of a steel plate placed with one surface facing upward and inverting the steel plate.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, Patent Document 1 has room for improvement in various aspects such as the need for a dedicated jig for plate inversion for inverting the steel plate, interference between the steel plate and the jig for plate inversion and members (e.g., cables) arranged on the floor, or cost.

[0005] One aspect of the present disclosure aims to provide a method for inverting a steel plate by lifting two locations of the steel plate. Or, one aspect of the present disclosure aims to provide a method for inverting a steel plate that can suppress interference with members arranged on the floor. Or, one aspect of the present disclosure aims to provide a method for inverting a steel plate that can reduce costs. Note that the description of these problems does not prevent the existence of other problems. Note that one aspect of the present disclosure does not necessarily need to solve all of these problems. Note that it is possible to extract other problems from the description of the specification, drawings, and claims.

Means for Solving the Problems

[0006] A steel plate inversion method according to one aspect of the present disclosure is characterized by comprising: a lifting step of lifting one side and the other side of the steel plate in a predetermined direction; and an inversion step of inverting the steel plate that has been lifted in the lifting step. [Effects of the Invention]

[0007] According to one aspect of this disclosure, a method for inverting a steel plate can be provided by lifting the steel plate at two points. Alternatively, a method for inverting a steel plate can be provided that can suppress interference with members placed on the floor. Alternatively, a method for inverting a steel plate can be provided that can reduce costs. [Brief explanation of the drawing]

[0008] [Figure 1] This is a view from a third direction of the steel plate to be inverted by the steel plate inversion method according to one embodiment. [Figure 2] This is a view of the steel plate from a second direction. [Figure 3] This figure shows a steel plate and a reinforcing section, where (a) is a cross-sectional view along the first direction and (b) is a cross-sectional view of (a) taken along the arrow BB. [Figure 4] This figure shows a reversing device used in a steel plate reversing method according to one embodiment, and is a view of the steel plate from a second direction. [Figure 5] This is a diagram showing a reversing device, viewed from a third direction of the steel plate. [Figure 6] This is a diagram showing a reversing device, viewed from the first direction of the steel plate. [Figure 7] This is a flowchart of a steel plate inversion method according to one embodiment. [Figure 8] This figure illustrates the lifting step of a steel plate inversion method according to one embodiment. [Figure 9] This figure illustrates the lifting step of a steel plate inversion method according to one embodiment. [Figure 10] This figure illustrates the removal step of a steel plate inversion method according to one embodiment. [Figure 11] This figure illustrates the reversal step of a steel plate reversal method according to one embodiment. [Figure 12] This figure illustrates the mounting step of a steel plate inversion method according to one embodiment. [Figure 13] This figure illustrates the arrangement step of a steel plate inversion method according to one embodiment. [Modes for carrying out the invention]

[0009] A method for inverting a steel plate according to one embodiment of this disclosure will be described below with reference to the drawings. First, let's describe the steel plate 10 that is the target of the steel plate inversion method. The steel plate 10 is a flat plate-shaped member having a first surface 10a (one surface of the steel plate 10) and a second surface 10b (the other surface of the steel plate 10) (see Figure 2). As will be described in detail later, in one embodiment of the steel plate inversion method, the first surface 10a and the second surface 10b of the steel plate 10 are inverted using an inversion device 40.

[0010] The steel plate 10 may be made of stainless steel, for example, or carbon steel. The steel plate 10 may be used as a fender structure, for example, by attaching fenders to it. The fender structure is attached to aquatic structures such as quays and piers. The fender structure prevents direct contact between the ship and the aquatic structure when the ship docks with the aquatic structure, thereby preventing damage to the ship and the aquatic structure. However, the use of the steel plate 10 is not limited to this, and it may be used for other purposes as well.

[0011] In the following description, a direction along the plate surface of the steel plate 10 (that is, the first surface 10a and the second surface 10b) is referred to as the first direction X (predetermined direction). A direction along the plate surface of the steel plate 10 and orthogonal to the first direction X is referred to as the second direction Y. A direction orthogonal to the first direction X and the second direction Y is referred to as the third direction Z. The third direction Z is also the thickness direction of the steel plate 10. Also, one direction along the first direction X (+X side) is referred to as one side. The opposite direction (-X side) is referred to as the other side.

[0012] FIG. 1 is a view of the steel plate 10 seen from the third direction Z. FIG. 2 is a view of the steel plate 10 seen from the second direction Y. As shown in FIG. 1, the steel plate 10 is formed by welding a plurality of steel plate members 11. Specifically, the plurality of plate members 11 are arranged side by side in the first direction X. The plate members 11 adjacent to each other in the first direction X are abutted against each other and welded. At this time, the plate members 11 adjacent to each other in the first direction X are temporarily fixed by the erection pieces 12. As shown in FIG. 2, the erection pieces 12 are provided on the first surface 10a of the steel plate 10 (plate member 11). The erection pieces 12 are welded (temporarily welded) to the first surface 10a of the steel plate 10 (plate member 11). The erection pieces 12 are provided so as to straddle the plate members 11 adjacent to each other in the first direction X. A plurality of erection pieces 12 are provided at intervals in the second direction Y. After the steel plate 10 (plate member 11) is welded, the erection pieces 12 are removed from the steel plate 10.

[0013] Further, a reinforcing portion 20 is attached to the steel plate 10. The reinforcing portion 20 extends in the first direction X. The reinforcing portion 20 is provided so as to sandwich the steel plate 10 in the third direction Z (thickness direction) and suppresses bending and distortion of the steel plate 10. A plurality of reinforcing portions 20 are provided at intervals in the second direction Y. The reinforcing portion 20 is arranged so as not to overlap with the erection piece 12 in the second direction Y.

[0014] FIG. 3 is a view showing the steel plate 10 and the reinforcing portion 20, (a) is a cross-sectional view along the first direction X, and (b) is a cross-sectional view taken along the B-B arrow in (a). As shown in FIG. 3, the reinforcing portion 20 includes a pair of reinforcing members 21 (suspended portions), a spacer 22 (anti-drop member), and a fixing member 23.

[0015] The reinforcing member 21 is, for example, an H-shaped steel. The reinforcing member 21 extends in the first direction X. The pair of reinforcing members 21 are arranged sandwiching the steel plate 10 in the third direction Z. In addition, in order to prevent the occurrence of rust, it is preferable that the steel plate 10 and the reinforcing member 21 are arranged apart from each other. An intervening member 24 such as a rubber plate is provided between the steel plate 10 and the reinforcing member 21.

[0016] The pair of reinforcing members 21 are fixed to each other by the fixing member 23. The fixing position of the pair of reinforcing members 21 by the fixing member 23 is outside the steel plate 10 (a position that does not overlap the steel plate 10 in the first direction X). That is, the steel plate 10 is only sandwiched by the pair of reinforcing members 21 and is not fixed by the fixing member 23.

[0017] As shown in FIG. 1, the length of the reinforcing member 21 in the first direction X is longer than the length of the steel plate 10 in the first direction X. The reinforcing member 21 is provided such that both ends in the first direction X protrude outside the steel plate 10. Suspension pieces 25 used when lifting the steel plate 10 using the inversion device 40 are provided at both ends of the reinforcing member 21 in the first direction X. The suspension pieces 25 are attached to both ends of the reinforcing member 21, for example, by welding. That is, the reinforcing member 21 is also used as a suspended portion when lifting the steel plate 10 using the inversion device 40.

[0018] Returning to Figure 3, the spacer 22 is a plate-shaped member. The spacer 22 is positioned between a pair of reinforcing members 21, maintaining a constant distance between them. The spacer 22 is positioned at the fixing point of the pair of reinforcing members 21 by the fixing member 23. That is, the spacer 22 is positioned on the outside of the steel plate 10 (a position that does not overlap with the steel plate 10 in the first direction X). The spacer 22 is fixed together with the pair of reinforcing members 21 by the fixing member 23. As shown in Figure 2, the spacer 22 is provided on one side 10U (+X side) and the other side 10L (-X side) of the steel plate 10 in the first direction X.

[0019] The thickness of the spacer 22 (length in the third direction Z) is greater than the thickness of the steel plate 10 (length in the third direction Z). By providing the spacer 22 and the intervening member 24, the steel plate 10 can be held between the pair of reinforcing members 21 without contacting the reinforcing members 21. The spacer 22 also functions as a fall prevention member, preventing the steel plate 10 from falling (sliding) between the pair of reinforcing members 21 when the steel plate 10 is lifted using the inversion device 40.

[0020] The fixing member 23 includes, for example, a bolt 23a and a nut 23b. The reinforcing member 21 has a hole 21a through which the bolt 23a is inserted. In the illustrated example, the hole 21a is formed in the flange portion of the reinforcing member 21, which is an H-shaped steel beam, so as to penetrate the flange portion. The spacer 22 has a hole 22a through which the bolt 23a is inserted. The hole 22a is formed so as to penetrate the spacer 22 in the plate width direction. The shaft portion of the bolt 23a is inserted through the hole 21a of the pair of reinforcing members 21 and the hole 22a of the spacer 22. A nut 23b is screwed onto the tip of the shaft portion of the bolt 23a. This fixes the pair of reinforcing members 21 and spacer 22 to each other. The reinforcing member 21 has multiple holes 21a, spaced apart in the first direction X. This makes it possible to change the fixing position of the pair of reinforcing members 21 by the fixing member 23 according to the size of the steel plate 10 (for example, the length in the first direction X).

[0021] As shown in Figures 1 and 2, the steel plate 10 (multiple plate members 11) is placed on a frame 30. In this embodiment, the frame 30 is formed by a plurality of first support members 31 and a plurality of second support members 32. The first support members 31 are H-shaped steel. The first support members 31 are installed on the floor. The first support members 31 extend in the second direction Y. A plurality of first support members 31 are provided at intervals in the first direction X. The second support members 32 are H-shaped steel. The second support members 32 are installed on the first support members 31. The second support members 32 extend in the first direction X. The second support members 32 are spanned across adjacent first support members 31 in the first direction X. A plurality of second support members 32 are provided at intervals in the first direction X and the second direction Y. When viewed from a third direction Z, the multiple second support members 32 are arranged so as not to overlap with the erection piece 12 and the reinforcing part 20. This prevents the erection piece 12 and the reinforcing part 20 from coming into contact with the second support members 32 (frame 30). The configuration of the frame 30 is not limited to the above, and may be modified as appropriate as long as it prevents the erection piece 12 and the reinforcing part 20 from coming into contact with the frame 30.

[0022] As shown in Figure 2, when welding the steel plate 10 (plate member 11), the steel plate 10 is first placed on the frame 30 with the first surface 10a, which is the side on which the erection piece 12 is installed, facing downwards. In this state, the worker welds the steel plate 10 from above (the second surface 10b side). After the welding of the steel plate 10 is completed, the steel plate 10 is inverted using the inversion device 40 and placed on the frame 30 with the first surface 10a facing upwards. Subsequently, the worker removes the erection piece 12 from the steel plate 10 from above (the side with the first surface 10a) and performs penetrant testing on the steel plate 10.

[0023] Next, the configuration of the reversing device 40 will be described with reference to Figures 4 to 6. Figure 4 is a diagram showing the reversing device 40, viewed from the second direction Y of the steel plate 10. Figure 5 is a diagram showing the reversing device 40, viewed from the third direction Z of the steel plate 10. Figure 6 is a diagram showing the reversing device 40, viewed from the first direction X of the steel plate 10.

[0024] As shown in Figures 4-6, the inversion device 40 comprises a first crane 41, a first lifting jig 42 (lifting jig), a first sling 43, a swivel 44, a second crane 45, a second lifting jig 46, and a second sling 47.

[0025] The first crane 41 and the second crane 45 lift the steel plate 10 together. Specifically, the first crane 41 lifts one side 10U (+X side) of the steel plate 10 in the first direction X via the swivel 44, the first lifting jig 42, the first sling 43, and the reinforcing part 20 (reinforcing member 21). The second crane 45 lifts the other side 10L (-X side) of the steel plate 10 in the first direction X via the second lifting jig 46, the second sling 47, and the reinforcing part 20 (reinforcing member 21).

[0026] The first crane 41 is, for example, an overhead crane. A first wire W1 is lowered from the first crane 41. At its tip, the first wire W1 branches into two first branch wires sw1 (see Figure 6). The ends of the two first branch wires sw1 are connected to the first lifting jig 42.

[0027] As shown in Figure 5, the first sling 43 connects the reinforcing section 20 and the first lifting jig 42. Multiple first slings 43 are provided corresponding to each of the multiple reinforcing sections 20. One end of the first sling 43 is connected to the lifting piece 25 of the reinforcing section 20 (more specifically, the lifting piece 25 provided at one end (+X side) in the first direction X of the reinforcing member 21), and the other end is connected to the first lifting jig 42.

[0028] The first lifting jig 42 is provided between the first crane 41 and the steel plate 10 (reinforcement portion 20). The first lifting jig 42 includes a main body 42a, a plurality of steel plate side lifting pieces 42b, and two crane side lifting pieces 42c. The main body 42a is, for example, an H-shaped steel. The steel plate side lifting pieces 42b and the crane side lifting pieces 42c are attached to the main body 42a, for example, by welding. The plurality of steel plate side lifting pieces 42b are provided at intervals along the longitudinal direction of the main body 42a. One end of a plurality of first slings 43 is connected to each of the plurality of steel plate side lifting pieces 42b. The two crane side lifting pieces 42c are provided at both ends along the longitudinal direction of the main body 42a. The ends of two first branch wires sw1 are connected to each of the two crane side lifting pieces 42c.

[0029] The swivel 44 is provided between the first crane 41 and the first lifting jig 42. That is, the first crane 41 and the first lifting jig 42 are connected to each other via the swivel 44. As shown in Figure 6, the swivel 44 is provided, for example, at the branching point of the first branch wire sw1 in the first wire W1. With the swivel 44 in place, the first lifting jig 42 is able to rotate relative to the first crane 41 around the rotation axis of the swivel 44.

[0030] The second crane 45 is, for example, an overhead crane. A second wire W2 is lowered from the second crane 45. At its tip, the second wire W2 branches into two second branch wires sw2. The ends of the two second branch wires sw2 are connected to the second lifting jig 46.

[0031] The second sling 47 connects the reinforcing section 20 to the second lifting jig 46. Multiple second slings 47 are provided corresponding to each of the multiple reinforcing sections 20. One end of the second sling 47 is connected to the lifting piece 25 of the reinforcing section 20 (more specifically, the lifting piece 25 provided at the other end (-X side) of the reinforcing member 21 in the first direction X), and the other end is connected to the second lifting jig 46. The length of the second sling 47 is preferably longer than the length of the first sling 43.

[0032] The second lifting jig 46 is installed between the second crane 45 and the steel plate 10 (reinforcement portion 20). The configuration of the second lifting jig 46 is the same as that of the first lifting jig 42. That is, the second lifting jig 46 includes a main body 46a, a plurality of steel plate side lifting pieces 46b, and two crane side lifting pieces 46c. One end of a plurality of second slings 47 is connected to each of the plurality of steel plate side lifting pieces 46b. The ends of two second branch wires sw2 are connected to each of the two crane side lifting pieces 46c.

[0033] Next, the steel plate inversion method will be described with reference to Figures 7-13. As shown in Figure 7, the steel plate inversion method comprises a lifting step S1, a removal step S2, an inversion step S3, an installation step S4, an arrangement step S5, and an erection piece removal step S6.

[0034] As shown in Figure 8, in the lifting step S1, one side 10U (+X side) of the steel plate 10 in the first direction X and the other side 10L (-X side) of the steel plate 10 in the first direction X are lifted. Specifically, the first crane 41 lifts one side 10U of the steel plate 10 via the swivel 44, the first lifting jig 42, the first sling 43, and the reinforcing part 20 (reinforcing member 21). The second crane 45 lifts the other side 10L of the steel plate 10 via the second lifting jig 46, the second sling 47, and the reinforcing part 20 (reinforcing member 21).

[0035] Furthermore, as shown in Figure 9, in the lifting step S1, the steel plate 10 is lifted until it is in a position aligned substantially vertically. In this disclosure, when the steel plate 10 is said to be aligned substantially vertically, it means that the angle of intersection between the first direction X and the vertical direction is 10° or less. At this time, the steel plate 10 is lifted so that one side 10U is positioned on the upper vertical side and the other side 10L is positioned on the lower vertical side. Since the length of the second sling 47 is longer than the length of the first sling 43, the steel plate 10 can be easily positioned in the above position. Here, a spacer 22 (fall prevention member) is provided on the other side 10L, which is the side that is vertically lower. This prevents the steel plate 10 from falling out from between the pair of reinforcing members 21.

[0036] The removal step S2 is performed after the lifting step S1. As shown in Figure 10, in the removal step S2, the second lifting fixture 46 is removed from the other side 10L (the vertically lower side) of the steel plate 10. More specifically, the connection between the steel plate side lifting piece 46b of the second lifting fixture 46 and the other end of the second sling 47 is released, and the second lifting fixture 46 is removed from the second sling 47. As a result, the steel plate 10 is suspended by the first crane 41 on only one side 10U (the vertically upper side).

[0037] The inversion step S3 is performed after the removal step S2. As shown in Figure 11, in the inversion step S3, the first surface 10a and the second surface 10b of the steel plate 10 that was lifted in the lifting step S1 are inverted. At this time, the steel plate 10 is rotated around the rotation axis of the swivel 44. The rotation axis of the swivel 44 is approximately along a vertical line. That is, the steel plate 10 is rotated around an approximately vertical line. In this disclosure, an approximately vertical line means a straight line whose angle of intersection with the vertical direction is 10° or less. Since the swivel 44 is provided between the first crane 41 and the first lifting jig 42, the steel plate 10 can be easily rotated.

[0038] The mounting step S4 is performed after the inversion step S3. In the mounting step S4, as shown in Figure 12, the second lifting fixture 46, which was removed in the removal step S2, is attached to the other side 10L (the vertically lower side) of the steel plate 10. More specifically, the other end of the second sling 47 is reconnected to the steel plate side lifting piece 46b of the second lifting fixture 46.

[0039] The placement step S5 is performed after the mounting step S4. In the placement step S5, the first crane 41 and the second crane 45 lift one side 10U and the other side 10L (-X side) of the steel plate 10, which were inverted in the inversion step S3, again. Then, as shown in Figure 13, the steel plate 10 is placed on the frame 30 with the first surface 10a of the steel plate 10 (i.e., the surface to which the erection piece 12 is attached) facing upwards.

[0040] The erection piece removal step S6 is performed after the placement step S5. In the erection piece removal step S6, the erection piece 12 is removed from the first surface 10a of the steel plate 10. The worker removes the erection piece 12 from above the steel plate 10 (on the first surface 10a side). After that, burrs are removed from the welded portion of the steel plate 10 with the erection piece 12. If necessary, a penetrant testing test is also performed on the burr-removed portion of the steel plate 10.

[0041] As described above, the steel plate inversion method according to this embodiment comprises a lifting step S1 of lifting one side 10U and the other side 10L of the steel plate 10 in the first direction X (predetermined direction), and an inversion step S3 of inverting the steel plate 10 that was lifted in the lifting step S1. According to the above configuration, since one side 10U and the other side 10L of the steel plate 10 are lifted and the lifted steel plate 10 is inverted, the possibility of interference between the steel plate 10 and objects scattered on the floor can be reduced. Alternatively, since one side 10U and the other side 10L of the steel plate 10 are lifted and the lifted steel plate 10 is inverted, the need to use a special jig for inverting the steel plate 10 can be reduced. As a result, costs can be reduced. Alternatively, since one side 10U and the other side 10L of the steel plate 10 are lifted and the lifted steel plate 10 is inverted, the steel plate 10 can be inverted in a stable state.

[0042] Furthermore, in the reversal step S3, the steel plate 10 that was lifted in the lifting step S1 is rotated around a nearly vertical line. According to the above configuration, the space required to invert the steel plate 10 lifted in the lifting step S1 can be reduced, thereby reducing the possibility of the steel plate 10 interfering with various equipment.

[0043] Furthermore, the steel plate 10 lifted by the lifting step S1 is oriented approximately vertically. This configuration allows for a smaller space to be required to invert the steel plate 10 lifted in the lifting step S1, thereby reducing the possibility of the steel plate 10 interfering with various pieces of equipment.

[0044] Furthermore, in the lifting step S1, of the two sides 10L, the side that is vertically upper (one side 10U) is lifted via the swivel 44. This configuration makes it easier to invert the steel plate 10 that has been lifted in the lifting step S1.

[0045] The steel plate inversion method further includes a removal step S2. In the lifting step S1, of the two sides 10U and 10L, the side that is vertically lower (the other side 10L) is lifted via the second lifting jig 46 (lifting jig). In the removal step S2, after the lifting step S1 and before the inversion step S3, the second lifting jig 46 is removed from the vertically lower side (the other side 10L). According to the above configuration, the possibility of objects scattered on the floor interfering with the steel plate 10 can be reduced.

[0046] Furthermore, the steel plate inversion method further includes an attachment step S4, in which the second lifting jig 46 (lifting jig), which was removed in the removal step S2, is attached to the vertically lower side (the other side 10L) after the inversion step S3. According to the above configuration, the steel plate 10 can be stably lifted after it has been inverted.

[0047] The steel plate inversion method further includes a placement step S5. An erection piece 12 is provided on the first surface 10a (one side) of the steel plate 10. In the placement step S5, the steel plate 10 that was inverted in the inversion step S3 is placed so that the first surface 10a (one side) of the steel plate is facing upwards. According to the above configuration, the possibility of interference between objects scattered on the floor and the erection piece 12 can be reduced.

[0048] Furthermore, the steel plate inversion method further comprises an erection piece removal step S6, in which the erection piece 12 is removed from the steel plate 10 after the placement step S5. According to the above configuration, the erection piece 12 can be easily removed from the steel plate 10.

[0049] Furthermore, in the lifting step S1, one side 10U and the other side 10L are lifted via a reinforcing member 21 (suspended portion) attached to the steel plate 10. In the lifting step S1, a spacer 22 (fall prevention member) is provided on the side that is vertically lower (the other side 10L) of the two sides 10U and the other side 10L to prevent the steel plate 10 from falling off the reinforcing member 21. According to the above configuration, the steel plate 10 can be lifted stably.

[0050] It should be noted that this disclosure is not limited to the embodiments described above with reference to the drawings, and various modifications are possible within its technical scope.

[0051] For example, in the above embodiment, a steel plate inversion method was described for inverting a steel plate 10 when a steel plate 10 is formed by welding a plurality of plate members 11. However, the present disclosure is not limited thereto. The steel plate inversion method can be applied to inverting a steel plate 10 in various applications. For example, when welding both sides of a steel plate 10 for repair purposes, the steel plate inversion method may be used to invert the steel plate 10. When using a steel plate 10 as a fender structure, the steel plate inversion method may be used to invert the steel plate 10 when attaching (welding) a fender to the steel plate 10.

[0052] Furthermore, in the above embodiment, a lifting piece 25 is provided on the reinforcing portion 20 (reinforcing member 21), and the steel plate 10 is lifted by the inversion device 40 via the reinforcing portion 20. However, the disclosure is not limited thereto. The steel plate 10 may also be lifted directly by the inversion device 40. In this case, gripping members for gripping the steel plate 10 are provided at one end of the first sling 43 and one end of the second sling 47, and one end of the first sling 43 and one end of the second sling 47 may be directly connected to the steel plate 10 by gripping the steel plate with the gripping members.

[0053] In the above embodiment, the spacer 22 (fall prevention member) is provided on one side 10U (+X side) and the other side 10L (-X side) of the steel plate 10 in the first direction X. However, in the lifting step S1, the spacer 22 may be provided only on the side that is vertically downward of the two sides 10U and 10L, and not on the side that is vertically upward.

[0054] The first crane 41 and the second crane 45 may be cranes other than overhead cranes.

[0055] Furthermore, it is possible to replace the components in the above embodiments with well-known components as appropriate, without departing from the spirit of this disclosure, and the above-described modifications may be combined as appropriate.

[0056] (Note) The steel plate inversion method according to the above embodiment can be understood, for example, as follows.

[0057] <1> A steel plate inversion method according to one aspect of the present disclosure is characterized by comprising: a lifting step of lifting one side and the other side of the steel plate in a predetermined direction; and an inversion step of inverting the steel plate that has been lifted in the lifting step. According to the above configuration, since one side of the steel plate is lifted and the lifted steel plate is inverted, the possibility of interference between the steel plate and objects scattered on the floor can be reduced. Alternatively, since one side of the steel plate is lifted and the lifted steel plate is inverted, the need to use a special jig for inverting the steel plate can be reduced. As a result, costs can be reduced. Alternatively, since one side of the steel plate is lifted and the lifted steel plate is inverted, the steel plate can be inverted in a stable state.

[0058] <2> the above <1> In the steel plate inversion method relating to the present invention, in the inversion step, the steel plate lifted in the lifting step may be rotated around a substantially vertical line. According to the above configuration, the space required to invert the steel plate lifted by the lifting step can be reduced, thereby reducing the possibility of the steel plate interfering with various equipment.

[0059] <3> the above <2> In the steel plate inversion method relating to the present invention, the steel plate lifted in the lifting step may be oriented substantially vertically. According to the above configuration, the space required to invert the steel plate lifted by the lifting step can be reduced, and the possibility of the steel plate interfering with various equipment can be further reduced.

[0060] <4> the above <1> from <3> In the steel plate inversion method relating to any one of the above, in the lifting step, the vertically upper side of the one side and the other side may be lifted via a swivel. According to the above configuration, it becomes easier to invert the steel plate that has been lifted in the lifting step.

[0061] <5> the above <1> from <4> A steel plate inversion method relating to any one of the above further comprises a removal step, wherein in the lifting step, the vertically lower side of the one side and the other side is lifted via a lifting jig, and in the removal step, after the lifting step and before the inversion step, the lifting jig may be removed from the vertically lower side. The above configuration reduces the possibility of objects scattered on the floor interfering with the steel plate.

[0062] <6> the above <5> The steel plate inversion method relating to the present invention may further include, after the inversion step, an attachment step of attaching the lifting jig, which was removed in the removal step, to the vertically downward side. According to the above configuration, the steel plate can be stably lifted after it has been inverted.

[0063] <7> the above <1> from <6> In a steel plate inversion method relating to any one of the following steps, The steel plate may further be provided with an erection piece on one side, and in the arrangement step, the steel plate that was inverted in the inversion step may be arranged so that one side of the steel plate faces upward. The above configuration reduces the possibility of interference between objects scattered on the floor and the erection piece.

[0064] <8> the above <7> The steel plate inversion method relating to the above may further include an erection piece removal step, in which the erection piece is removed from the steel plate after the placement step. According to the above configuration, the erection piece can be easily removed from the steel plate.

[0065] <9> the above <1> from <8> In the steel plate inversion method relating to any one of the above, in the lifting step, one side and the other side are lifted via a suspended portion attached to the steel plate, and in the lifting step, a fall prevention member may be provided on the side that is vertically lower than the other side to prevent the steel plate from falling off the suspended portion. According to the above configuration, steel plates can be lifted stably. [Explanation of symbols]

[0066] 10 steel plate 10U One side 10L The other side 12 Erection Pieces 20 Reinforcement section 21 Reinforcement member (suspended part) 22 Spacer (anti-fall component) 40 Inverting device 41. Crane No. 1 42. First lifting jig 43. First Sling 44 Swivel 45. Second Crane 46. ​​Second lifting jig (lifting jig) 47. Second Sling S1 Lifting Step S2 Removal Step S3 Reversal Step S4 Mounting Steps S5 Placement Step S6 Erection Piece Removal Step X 1st direction (predetermined direction) Y Second direction Z 3rd direction

Claims

1. A lifting step that lifts one side and the other side of the steel plate in a predetermined direction, A reversal step in which the steel plate lifted in the lifting step is inverted, Equipped with, A method for inverting a steel plate, characterized in that the lifted steel plate is sandwiched in the thickness direction of the steel plate by a pair of members extending from one side to the other side on one side and the other side.

2. A lifting step that lifts one side and the other side of the steel plate in a predetermined direction at three or more points, A reversal step in which the steel plate lifted in the lifting step is inverted, A method for inverting steel plates, characterized by comprising the following features.

3. In the inversion step, the steel plate lifted in the lifting step is rotated around a substantially vertical line. The steel plate inversion method according to claim 1 or 2, characterized by the features described above.

4. The steel plate lifted by the aforementioned lifting step is oriented in a substantially vertical direction. The steel plate inversion method according to feature 3.

5. In the lifting step, the side that is vertically upper of the two sides is lifted via a swivel. The steel plate inversion method according to claim 1 or 2, characterized by the features described above.

6. Removal steps, Furthermore, In the lifting step, the vertically lower side of the one side and the other side is lifted via a lifting jig. In the removal step, after the lifting step and before the inversion step, the lifting jig is removed from the vertically lower side. The steel plate inversion method according to claim 1 or 2, characterized by the features described above.

7. After the inversion step, the mounting step involves attaching the lifting fixture, which was removed in the removal step, to the lower side in the vertical direction. The steel plate inversion method according to claim 6, further comprising the above.

8. Placement step, Furthermore, An erection piece is provided on one side of the steel plate. In the arrangement step, the steel plate that was inverted in the inversion step is arranged so that one side of the steel plate faces upward. The steel plate inversion method according to claim 1 or 2, characterized by the features described above.

9. After the placement step, an erection piece removal step is performed to remove the erection piece from the steel plate. It also has, The steel plate inversion method according to feature 8.

10. In the lifting step, one side and the other side are lifted via the suspended portion attached to the steel plate. In the lifting step, a fall prevention member is provided on the side that is vertically lower than the other side, to prevent the steel plate from falling off the suspended portion. The steel plate inversion method according to claim 1 or 2, characterized by the features described above.

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