Lifting devices, lifting structures, and methods for lifting building materials

Abstract

The present invention provides a lifting device with a simple structure that can reduce labor, a lifting structure using the lifting device, and a lifting method. [Solution] The lifting device 1 comprises an insertion plate 5 formed to be wider than the distance between a pair of lips 31 and narrower than the width inside the groove 30, and a lifting part 6 fixed to the middle of the width direction of the insertion plate 5 and lifted by a lifting device 4. The insertion plate 5 can be inserted into the groove 30 by inserting it diagonally between the pair of lips 31 from the first side portion 50, and when inserted into the groove 30, it is shaped so that it cannot be detached from the first side portion 50. When the lifting device 4 lifts the lifting part 6 while the insertion plate 5 is detached from the groove 30, the insertion plate 5 tilts so that the first side portion 50 is higher than the second side portion 51.

Description

Technical Field

[0001] The present invention relates to a sling for connecting a building material to a lifting device, a suspension structure using the sling, and a lifting method.

Background Art

[0002] Conventionally, when lifting a building material such as an outer wall panel, for example, a sling for connecting a connecting fitting such as a shackle provided at the lower end of a lifting device to a C-shaped groove provided in the building material is known (see Patent Document 1 and Patent Document 2). Such a sling can be inserted into the groove, and moreover, it needs to be formed so that the sling is caught by the lip of the opening from the inside of the groove.

[0003] In Patent Document 1, the sling includes a locking member that is substantially rectangular plate-shaped with one side being long and rotatable horizontally. The locking member is arranged such that the long direction faces the length direction of the groove, the locking member is inserted into the groove portion, and by horizontally rotating the inserted locking member by 90 degrees, the locking member abuts across the lower surface of the lip of the groove portion, and thereby a building material can be lifted is disclosed.

[0004] Further, in Patent Document 2, the portion inserted into the groove of the sling has a first locking piece and a second locking piece inserted into the recess of the first locking piece. By changing the protruding length of the second locking piece protruding from the recess, the whole can be expanded and contracted. After inserting it into the groove portion, by protruding the second locking piece to extend the overall length, the first locking piece and the second locking piece abut against the lower surface of the lip of the groove portion, and a configuration for lifting a building material is disclosed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

[0006] Conventional lifting devices required operations such as rotating and extending the locking material when attaching them to the groove and when removing them from the groove, making the operation complicated. Furthermore, the structure of the lifting device was complex due to the need for rotation and extension, which increased the risk of deterioration and malfunction over time.

[0007] Therefore, the present invention aims to provide a lifting device with a simple structure that can reduce labor, a lifting structure using the lifting device, and a lifting method. [Means for solving the problem]

[0008] The first invention, which solves the above problems, is a lifting device formed in a building material, which connects a groove provided at the opening edge of a building material to a lifting device, and comprises an insertion plate formed wider than the distance between the pair of lips and narrower than the width inside the groove, and a lifting portion fixed to the middle of the insertion plate in the width direction and lifted by the lifting device, wherein the insertion plate has a first side portion formed on one side edge side with respect to the back surface of one of the lips. Furthermore, a second side portion is formed on the other side edge that abuts against the back surface of the other lip, and the insertion plate is shaped so that the entire insertion plate can be inserted into the groove by inserting it diagonally between the pair of lips from the first side portion, and the insertion plate is shaped so that it cannot be detached from the first side portion when it is inserted into the groove portion, and when the lifting device lifts the lifting portion while it is detached from the groove portion, the insertion plate tilts so that the first side portion is higher than the second side portion.

[0009] The second invention relates to the suspension device of the first invention, wherein the suspension portion has two legs, one end of which is fixed to the insertion plate, and a connecting portion that connects the ends of the two legs opposite to the insertion plate, and the two legs are formed by fixing one end of each leg at a right angle to the insertion plate and bending obtusely towards the first side portion in the middle.

[0010] The third invention relates to the suspension device of the first or second invention, wherein the suspension portion has a side plate that protrudes from the second side portion and extends along the side surface of the suspension portion, and the side plate abuts against the lip located on the second side portion when the insertion plate is inserted into the groove portion, thereby restricting the first side portion of the insertion plate from passing between the lips.

[0011] The fourth invention is a suspension structure using the suspension devices of the first to third inventions, wherein the building material has one groove formed therein, and a plurality of suspension devices are fixed to the groove, and the legs of the suspension parts of adjacent suspension devices are arranged to bend alternately in opposite directions.

[0012] The fifth invention is a suspension structure using the suspension devices of the first to third inventions, wherein the building material has two parallel grooves formed therein, and the suspension device fixed to one groove and the suspension device fixed to the other groove are arranged such that the legs of the suspension parts bend in directions away from each other.

[0013] The sixth invention is a method for suspending building materials using the suspension devices of the first to third inventions, wherein the building material is placed with the opening of the groove facing upward, the suspension part connected to the lifting device is tilted so that the first side faces downward, the first side of the insertion plate is inserted into the groove, the suspension part is raised, the entire insertion plate is inserted into the groove, and then the lifting device is operated to suspend the building material. [Effects of the Invention]

[0014] According to the first invention, the lifting device connects a groove formed in a building material to a lifting device. The insertion plate of the lifting device is wider than the distance between a pair of lips and narrower than the width inside the groove. By inserting it diagonally between the pair of lips from the first side, the entire insertion plate can be inserted into the groove. By inserting the insertion plate into the groove, the insertion plate contacts the lower surface of the lips in the groove, allowing the building material to be lifted. Furthermore, the insertion plate is shaped so that it cannot be detached from the first side when inserted into the groove. Moreover, when the lifting device is lifted, the insertion plate is inclined so that the first side is higher than the second side. Therefore, when the lifting device lifts the lifting device and the building material connected to the lifting device, it is possible to more reliably prevent the insertion plate from detaching from the groove, thereby increasing safety when lifting building materials. Furthermore, since the insertion plate does not require rotation or extension when attaching or detaching it from the groove, the labor involved in lifting building materials can be reduced, and the lifting device can be made simpler in configuration, thereby suppressing deterioration of the lifting device and making maintenance easier.

[0015] According to the second invention, the two legs of the suspension part are fixed at one end perpendicular to the insertion plate and bent obtusely toward the first side in the middle. Therefore, when the suspension part is lifted by the lifting device, a force is more easily applied to the insertion plate in a direction that makes the first side higher than the second side, thus more reliably preventing the insertion plate from coming out of the groove. Furthermore, when the building material is placed on the workpiece surface, the suspension part tends to tilt toward the first side, making it easier to attach to and detach from the groove.

[0016] According to the lifting device of the third invention, when the insertion plate is inserted into the groove, the side plate abuts against the lip located on the second side, thereby restricting the first side of the insertion plate from passing between the lips. Therefore, when inserting the insertion plate into the groove, it can be inserted into the groove from the first side, and when removing the insertion plate from the groove, it cannot be removed from the first side, but can only be removed from the second side. Thus, the lifting device can be easily attached to and detached from the groove with a simple configuration, and safety can be maintained when lifting building materials.

[0017] According to the suspension structure of the fourth invention, a groove is formed in the building material, and the legs of the suspension parts of the suspension devices adjacent to each other are arranged to bend alternately in opposite directions within the groove, thereby enabling the building material to be lifted stably and enhancing safety.

[0018] According to the fifth invention, the building material has two parallel grooves formed therein, and the legs of the suspension part of the suspension device fixed to one groove and the suspension part of the suspension device fixed to the other groove are arranged to bend in directions away from each other, so that the building material can be lifted stably and safety can be enhanced.

[0019] According to the building material lifting method of the sixth invention, after placing the building material with the opening of the groove facing upward, the lifting part connected to the lifting device is tilted so that the first side faces downward, the first side of the insertion plate is inserted into the groove, and the lifting part is raised to insert the entire insertion plate into the groove, and then the lifting device is operated to lift the building material. As a result, the building material can be lifted with simple operation and the lifted building material can be reliably prevented from falling. [Brief explanation of the drawing]

[0020] [Figure 1] This is a perspective view illustrating the overall configuration of the suspension device; (A) is a view from the second side, and (B) is a view from the first side. [Figure 2] Side view explaining the overall structure of the sling. [Figure 3] Side view explaining the state where the sling is connected to the shackle of the lifting device and lifted. [Figure 4] Side view explaining the dimensions of the sling and the groove part. [Figure 5] Side view explaining the state where the insertion plate of the sling is inserted into the groove part and the building material is lifted. [Figure 6] Side view explaining that the insertion plate cannot be inserted into the groove part from the second side part. [Figure 7] Side view explaining that the insertion plate cannot be taken out of the groove part from the first side part when it is about to be removed. [Figure 8] Side view of the building material explaining the state where one groove part is formed in the building material and the legs of the hanging parts of a plurality of slings are arranged to bend alternately in opposite directions. [Figure 9] Perspective view explaining the state where one groove part is formed in the building material and the legs of the hanging parts of a plurality of slings are arranged to bend alternately in opposite directions. [Figure 10] Side view explaining the state where two groove parts parallel to each other are formed in the building material and the legs of the hanging parts of the sling fixed to one groove part and the sling fixed to the other groove part are arranged to bend in a direction away from each other. [Figure 11] Figure explaining the method of lifting the building material showing the state where the first side part of the insertion plate is inserted into the groove part. [Figure 12] Figure explaining the method of lifting the building material showing the state where the entire insertion plate is inserted into the groove part.

Embodiments for Carrying Out the Invention

[0021] The following describes embodiments of the lifting device 1, lifting structure 2, and method for lifting building materials 3 of the present invention with reference to the respective figures. The lifting device 1, lifting structure 2, and method for lifting building materials 3 of this embodiment are, for example, lifting building materials 3 in a factory. These lifting devices 1, lifting structures 2, and methods for lifting building materials 3 are not limited to use in a factory, but can be used in various processes during the manufacturing, transportation, and on-site construction of building materials 3 where it is necessary to lift the building materials 3.

[0022] In this embodiment, as shown in Figure 5, the lifting device 1 is used to lift the building material 3 to a lifting device 4 installed in a factory that manufactures concrete exterior wall panels as building materials 3. The concrete building material 3 is formed by pouring and curing concrete in a formwork, and the building material 3 is lifted by the lifting device 4 when it is removed from the formwork. A groove 30 is formed in the building material 3. The groove 30 has a pair of lips 31 formed parallel to each other and provided at the opening edge. In this embodiment, the groove 30 is a lip channel steel embedded in the concrete building material 3. The groove 30 is not limited to this, and can be any material into which the insertion plate 5 of the lifting device 1 (described later) can be inserted and into which the insertion plate 5 can be hooked. Furthermore, the building material 3 is not limited to concrete, and can be any building material 3 having a groove 30 that can be connected by the lifting device 1.

[0023] The lifting device 1 is connected to a shackle 41 formed at the lower end of the belt sling 40 of the lifting device 4. The groove 30 formed on the back surface of the building material 3 is then connected to the lifting device 1, and the exterior wall panel, which is the building material 3, is lifted by the lifting device 4. The lifting device 1 hooks onto the lip 31 of the groove 30, connecting the shackle 41 of the lifting device 4 to the building material 3 and lifting the building material 3. In this embodiment, the lifting device 4 is an overhead crane installed in a factory, but the location where the building material 3 is lifted is not limited to a factory, and may be used when loading and unloading the building material 3 onto a truck or during on-site construction.

[0024] <Regarding lifting equipment> As shown in Figures 1 and 2, the lifting device 1 is a steel member comprising an insertion plate 5 inserted into the groove 30 and a lifting portion 6 fixed to the insertion plate 5 and connected to the shackle 41 of the lifting device 4.

[0025] As shown in Figure 4, the insertion plate 5 is formed in the shape of a rectangular flat plate, and when inserted into the groove 30, it is positioned so that the length direction of the insertion plate 5 is parallel to the longitudinal direction of the groove 30. The insertion plate 5 is positioned so that its width direction is perpendicular to the longitudinal direction of the groove 30. The length α of the insertion plate 5 in the width direction is wider than the distance β between the pair of lips 31 of the groove 30, and narrower than the width γ inside the groove 30. As a result, the insertion plate 5 inserted into the groove 30 can lift the building material 3 by contacting the back surfaces of each of the pair of lips 31. The insertion plate 5 has a first side portion 50 on one side in the width direction and a second side portion 51 on the other side in the width direction, with the lifting portion 6 in between. When inserting the insertion plate 5 into the groove 30, the insertion plate 5 is tilted so that the first side portion 50 is lower than the second side portion 51, and inserted between the lips 31 of the groove 30 from the first side portion 50 side. With the insertion plate 5 remaining in an inclined position, the first side portion 50 of the insertion plate 5 approaches one of the lower corner portions 32 formed by the bottom surface and side surface of the groove portion 30, allowing the second side portion 51 to be inserted between the lips 31 of the groove portion 30.

[0026] As shown in Figures 1 and 2, the lifting section 6 is formed by curving a cylindrical steel material. Its lower end is welded to the middle of the insertion plate 5 in the width direction, with a first side portion 50 formed on one side of the lifting section 6 and a second side portion 51 formed on the other. The lifting section 6 has two legs 60 fixed to the insertion plate 5 and a connecting portion 61 that connects the ends of the two legs 60 opposite to the insertion plate 5. The connecting portion 61 is formed in an arc shape. The lifting section 6 connects the lifting device 4 and the lifting device 1 by connecting the connecting portion 61 to the shackle 41 of the lifting device 4. When viewed from the width direction of the insertion plate 5, the lifting section 6 is formed in an inverted U shape. The two legs 60 are fixed perpendicularly to the insertion plate 5. Each of the two legs 60 is bent at an obtuse angle toward the first side portion 50.

[0027] As described above, because the legs 60 of the suspension part 6 are bent, when the lifting device 4 lifts only the suspension device 1, the insertion plate 5 tilts so that the first side portion 50 is higher than the second side portion 51, as shown in Figure 3. Furthermore, when the insertion plate 5 of the suspension device 1 is placed on a horizontal surface, the suspension part 6 is prone to tipping over toward the first side portion 50 due to the bent legs 60 of the suspension part 6, and as shown in Figure 11, if the suspension part 6 tips over, the insertion plate 5 will tilt downwards toward the first side portion 50 as a result.

[0028] As shown in Figures 1 and 2, the suspension portion 6 has a side plate 62 that protrudes from the second side portion 51 of the insertion plate 5 and extends along the side surface of the leg portion 60 of the suspension portion 6. Because the side plate 62 abuts against the lip 31, the second side portion 51 of the insertion plate 5 inserted into the groove portion 30 cannot approach the other lower corner portion 33 in the groove portion 30. Therefore, as shown in Figure 6, when the insertion plate 5 is inserted between the pair of lips 31 from the second side portion 51 side, the first side portion 50 cannot pass between the pair of lips 31, and thus the insertion plate 5 cannot be inserted into the groove portion 30. Also, as shown in Figure 7, when the insertion plate 5 is inserted into the groove portion 30, the side plate 62 abuts against the lip 31, restricting the movement of the insertion plate 5, so that the first side portion 50 cannot pass between the lips 31 and it cannot be removed from the groove portion 30.

[0029] <Regarding the suspension structure of building materials> As shown in Figures 8 and 9, the suspension structure 2 for the building material 3 in this embodiment has a single groove 30 formed along the entire length in the longitudinal direction of the building material 3. The groove 30 is a lip channel steel, and multiple lifting devices 1 are provided at equal intervals along the longitudinal direction of the groove 30. The lifting devices 1 are arranged so that the legs 60 of the lifting parts 6 of adjacent lifting devices 1 bend alternately in opposite directions, thereby lifting the building material 3 while keeping it horizontal. The groove 30 is located at the center of the mass in the width direction of the building material 3 and extends in the longitudinal direction of the building material 3. The lifting devices 4 are formed on the ceiling in the direction in which the legs 60 of each lifting device 1 are bent, and the forces transmitted from each lifting device 1 to the building material 3 are balanced to keep the building material 3 horizontal.

[0030] <Regarding the suspension structure of other building materials> The suspension structure 2 for the building material 3 is not limited to the one described above. The building material 3 may have two parallel grooves 30 formed along its entire length in the longitudinal direction, as shown in Figure 10. Each groove 30 is a lip channel steel, and the suspension device 1 fixed to one groove 30 and the suspension device 1 fixed to the other groove 30 are fixed to each groove 30 such that the legs 60 of the suspension part 6 bend in directions away from each other. At least two suspension devices 1 are fixed to each of the two grooves 30 of the building material 3 at a distance from each other in the longitudinal direction, and the building material 3 is suspended while being kept horizontal by four or more suspension devices 1.

[0031] <Regarding methods for suspending building materials> When lifting the building material 3, first, the building material 3 is placed so that the opening of the groove 30 faces upward. The placement surface 7 on which the building material 3 is placed is a horizontally formed work platform, and a lifting device 4 such as an overhead crane is positioned above it. After the building material 3 is placed, next, as shown in Figure 11, the lifting part 6, which is connected to the shackle 41 formed at the lower end of the belt sling 40 of the lifting device 4, is positioned so that the insertion plate 5 abuts against the lip 31 of the groove 30, and the first side portion 50 of the insertion plate 5 is inserted into the groove 30 while tilting it so that the first side portion 50 faces downward.

[0032] When the end of the insertion plate 5 on the first side portion 50 approaches one of the lower corner portions 32 formed by the bottom surface and side surface of the groove portion 30, the second side portion 51 becomes insertable between the pair of lips 31 of the groove portion 30. Then, as shown in Figure 12, the lifting portion 6 is raised and the second side portion 51 is inserted between the pair of lips 31, and the entire insertion plate 5 is inserted into the groove portion 30. After that, the lifting device 4 is operated to raise the lifting device 1, and the building material 3 is lifted as shown in Figures 5, 8, 10, etc.

[0033] When lowering the lifted building material 3, the lifting device 4 is operated to lower the lifting device 1, thereby placing the building material 3 on the mounting surface 7 as shown in Figure 12. Once the building material 3 is placed, the lifting portion 6 of the lifting device 1 is then tilted towards the first side portion 50, as shown in Figure 11. In this way, the end of the insertion plate 5 on the first side portion 50 approaches one of the lower corner portions 32, and the second side portion 51 of the insertion plate 5 protrudes outward from between the pair of lips 31. Then, the entire insertion plate 5 is pulled out from the groove portion 30, releasing the connection between the lifting device 1 and the building material 3.

[0034] Thus, according to the lifting device 1, lifting structure 2, and lifting method of this embodiment, the entire insertion plate 5 can be inserted into the groove 30 by inserting it from the first side portion 50, and the insertion plate 5 inside the groove 30 can be removed from the groove 30 only from the second side portion 51. Since the width of the insertion plate 5 is wider than the width between the lips 31 of the groove 30, the building material 3 can be lifted without falling out while inserted. Furthermore, when the lifting device 4 lifts the lifting device 1 while the building material 3 is not being lifted, the insertion plate 5 tilts so that the first side portion 50 is positioned above the second side portion 51. Therefore, when the insertion plate 5 is inserted into the groove 30 and the lifting device 4 lifts the building material 3 together with the lifting device 1, the connection between the lifting device 1 and the building material 3 is released, preventing the building material 3 from falling out.

[0035] Furthermore, according to the suspension device 1, suspension structure 2, and suspension method of this embodiment, the insertion plate 5 is connected to the groove 30 without requiring any deformation such as rotation or expansion / contraction, so the suspension device 1 can be made into a simple structure, resulting in a suspension device 1 and suspension structure 2 that are safe and highly reliable.

[0036] It goes without saying that the embodiments of the present invention are not limited to those described above, and can be modified as appropriate without departing from the scope of the spirit of the present invention.

[0037] This specification discloses the following technologies:

[0038] [Note 1] A lifting device comprising: an insertion plate formed wider than the distance between the pair of lips and narrower than the width of the inside of the groove; and a lifting portion fixed to the middle of the insertion plate in the width direction and lifted by the lifting device, wherein the insertion plate has a first side portion formed on one side edge side with respect to the back surface of one of the lips, and the other A second side portion is formed on one side edge that abuts against the back surface of the other lip, and the insertion plate is shaped so that the entire insertion plate can be inserted into the groove by inserting it diagonally between the pair of lips from the first side portion, and the insertion plate is shaped so that it cannot be detached from the first side portion when inserted into the groove portion, and when the lifting device lifts the lifting portion while the insertion plate is detached from the groove portion, the insertion plate tilts so that the first side portion is higher than the second side portion.

[0039] According to the lifting device described in Appendix 1, the lifting device connects a groove formed in the building material to a lifting device. The insertion plate of the lifting device is wider than the distance between the pair of lips and narrower than the width of the inside of the groove. By inserting it diagonally between the pair of lips from the first side, the entire insertion plate can be inserted into the groove. By inserting the insertion plate into the groove, the insertion plate comes into contact with the lower surface of the lips in the groove, allowing the building material to be lifted. Furthermore, the insertion plate is shaped so that it cannot be detached from the first side when inserted into the groove. Moreover, when the lifting device is lifted, the insertion plate is inclined so that the first side is higher than the second side. Therefore, when the lifting device lifts the lifting device and the building material connected to the lifting device, it is possible to more reliably prevent the insertion plate from detaching from the groove, thereby increasing safety when lifting the building material. Furthermore, since the insertion plate does not require rotation or extension when attaching or detaching it from the groove, the labor involved in lifting building materials can be reduced, and the lifting device can be made simpler in configuration, thereby suppressing deterioration of the lifting device and making maintenance easier.

[0040] [Note 2] In the suspension device described in Appendix 1, the suspension portion has two legs, one end of which is fixed to the insertion plate, and a connecting portion that connects the ends of the two legs opposite to the insertion plate, and the two legs are formed by fixing one end of each leg at a right angle to the insertion plate and bending at an obtuse angle toward the first side portion in the middle.

[0041] According to the lifting device described in Appendix 2, the two legs of the lifting section are fixed at one end perpendicular to the insertion plate, and are bent at an obtuse angle toward the first side in the middle. Therefore, when the lifting device is lifted by the lifting device, a force is more likely to be applied to the insertion plate in a direction that makes the first side higher than the second side, thus more reliably preventing the insertion plate from coming out of the groove. Furthermore, when the building material is placed on the workpiece surface, the lifting section tends to tilt toward the first side, making it easier to attach to and detach from the groove.

[0042] [Note 3] In the suspension device of Appendix 2, the suspension portion has a side plate that protrudes from the second side portion and extends along the side surface of the suspension portion, and when the insertion plate is inserted into the groove portion, the side plate abuts against the lip located on the second side portion side, thereby restricting the first side portion of the insertion plate from passing between the lips.

[0043] According to the lifting device described in Appendix 3, when the insertion plate is inserted into the groove, the side plate comes into contact with the lip located on the second side, thereby restricting the first side of the insertion plate from passing between the lips. Therefore, when inserting the insertion plate into the groove, it can be inserted into the groove from the first side, and when removing the insertion plate from the groove, it cannot be removed from the first side, but can only be removed from the second side. Thus, the lifting device can be easily attached to and detached from the groove with a simple configuration, while maintaining safety when lifting building materials.

[0044] [Note 4] In the suspension structure using the suspension device described in Appendix 2, the building material has one groove formed therein, and a plurality of suspension devices are fixed to the groove, and the legs of the suspension parts of adjacent suspension devices are arranged to bend alternately in opposite directions.

[0045] According to the suspension structure described in Appendix 4, a groove is formed in the building material, and the legs of the suspension parts of adjacent suspension devices are arranged to bend alternately in opposite directions within this groove, thereby enabling the building material to be lifted stably and enhancing safety.

[0046] [Note 5] In the suspension structure using the suspension device described in Appendix 2, the building material has two parallel grooves formed therein, and the suspension device fixed to one groove and the suspension device fixed to the other groove are arranged such that the legs of the suspension parts bend in directions away from each other.

[0047] According to the suspension structure described in Appendix 5, the building material has two parallel grooves formed therein, and the legs of the suspension parts of the suspension device fixed to one groove and the suspension device fixed to the other groove are arranged to bend in directions away from each other, thereby enabling the building material to be lifted stably and enhancing safety.

[0048] [Note 6] In the method for lifting building materials using the lifting device described in Appendix 2, the building material is placed so that the opening of the groove faces upward, the lifting part connected to the lifting device is tilted so that the first side faces downward, the first side of the insertion plate is inserted into the groove, the lifting part is raised, the entire insertion plate is inserted into the groove, and then the lifting device is operated to lift the building material.

[0049] According to the method for lifting building materials described in Appendix 6, after placing the building material with the opening of the groove facing upward, the lifting part connected to the lifting device is tilted so that the first side faces downward, the first side of the insertion plate is inserted into the groove, and the lifting part is raised to insert the entire insertion plate into the groove. Then, the lifting device is operated to lift the building material. This method allows the building material to be lifted with simple operation and reliably prevents the lifted building material from falling. [Industrial applicability]

[0050] The lifting device, lifting structure, and method for lifting building materials according to the present invention can be suitably used, for example, when demolding concrete building materials formed in formwork. [Explanation of symbols]

[0051] 1...Lifting device, 2...Lifting structure, 3...Building material, 4...Lifting device, 5...Insertion plate, 6...Lifting section, 30...Groove section, 31...Lip, 50...First side section, 51...Second side section

Claims

1. A lifting device that connects a pair of parallel lips formed in a building material to a groove provided at the opening edge, An insertion plate formed wider than the distance between the pair of lips and narrower than the width inside the groove, A suspension portion fixed to the middle of the width direction of the insertion plate and lifted by the lifting device, Equipped with, The insertion plate has a first side portion formed on one side edge that abuts against the back surface of one of the lips, and a second side portion formed on the other side edge that abuts against the back surface of the other lip, with the suspension portion in between. The insertion plate is shaped such that it can be inserted diagonally between the pair of lips from the first side, allowing the entire insertion plate to be inserted into the groove, and the insertion plate is shaped such that it cannot be detached from the first side when inserted into the groove. A lifting device characterized in that, when the lifting device lifts the lifting portion while the insertion plate is detached from the groove, the insertion plate tilts such that the first side is higher than the second side.

2. The suspension portion has two legs, one end of which is fixed to the insertion plate, and a connecting portion that connects the ends of the two legs opposite to the insertion plate. The suspension device according to claim 1, characterized in that one end of each of the two legs is fixed perpendicular to the insertion plate, and the intermediate portion is bent at an obtuse angle toward the first side portion.

3. The suspension portion has a side plate that protrudes from the second side portion and extends along the side surface of the suspension portion. The lifting device according to claim 1, characterized in that the side plate abuts against the lip positioned on the second side when the insertion plate is inserted into the groove, thereby restricting the first side of the insertion plate from passing between the lips.

4. A suspension structure using the suspension device described in claim 2, The aforementioned building material has one of the aforementioned grooves formed therein. Multiple of the aforementioned suspension devices are fixed to the groove portion. A suspension structure characterized in that the legs of the suspension parts of adjacent suspension devices are arranged to bend alternately in opposite directions.

5. A suspension structure using the suspension device described in claim 2, The aforementioned building material has two grooves that are parallel to each other formed therein. A suspension structure characterized in that the suspension member fixed to one groove and the suspension member fixed to the other groove are arranged such that the legs of the suspension members are bent in directions away from each other.

6. A method for suspending building materials using the suspension device described in claim 2, The building material is placed so that the opening of the groove faces upward. The lifting portion connected to the lifting device is tilted so that the first side faces downward, and the first side of the insertion plate is inserted into the groove, while the lifting portion is raised, and the entire insertion plate is inserted into the groove. Subsequently, the lifting device is operated to lift the building material. Methods for suspending building materials.

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