Method of installing suspended scaffolding

Abstract

This invention provides a means to improve the workability of securing suspended scaffolding. [Solution] A method for installing a suspended scaffold, wherein a hook X3 having a through hole and an expandable / contractable nut X4 having an expandable / contractable screw hole are inserted into a long threaded rod X2 that constitutes the suspended scaffold X, and the hook X3 is moved to a locking position with respect to the object (shaped steel Y) on which the suspended scaffold A is installed by expanding the screw hole of the expandable / contractable nut X4, thereby fixing the suspended scaffold X.

Description

Technical Field

[0001] The present invention relates to a method for installing a suspension scaffold, and more particularly to a method for installing a suspension scaffold that enables labor saving in the work of fastening nuts performed during the fixing work of the suspension scaffold.

Background Art

[0002] As a suspension scaffold that is locked and fixed to a structural member such as a steel section constituting a building, the applicant has invented a suspension scaffold described in Patent Document 1 below. As shown in FIG. 10, this suspension scaffold has a long screw rod b provided on the suspension scaffold a, and a hook d that can be locked to the flange c1 of the steel section c is inserted therein. A wing nut e provided on the screw rod b is screwed, and the suspension scaffold a is fixed by tightening with the hook d.

[0003] Since the screwing operation of this wing nut e is performed manually by an operator, there is a problem that the burden on the operator increases as the total length of the screw rod b increases. Therefore, the applicant has invented an intermediate insertion type wing nut wrench described in Patent Document 2 below, and while inserting this wrench into the wing nut from the middle part of the screw rod, the wrench is rotated by driving a separate screwdriver, so that the wing nut can be screwed without manual operation.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] One of the objectives of the present invention is to provide a means that contributes to improving the workability of fixing suspended scaffolding in a manner different from the prior art described above. [Means for solving the problem]

[0006] The present invention, made to solve the above problems, is a method for installing a suspended scaffolding, characterized in that a hook having a through hole and an expandable / contractable nut having an expandable / contractable screw hole are inserted into a long threaded rod constituting the suspended scaffolding, the expandable / contractable nut is moved on the threaded rod with the screw hole expanded to move the hook to the locking position of the object to which the suspended scaffolding is to be installed, and then the suspended scaffolding is fixed by contracting the screw hole to position the nut on the threaded rod. Furthermore, the present invention may be configured such that the expandable nut comprises at least an outer shell portion constituting an outer shell, and a female screw portion housed in the outer shell portion, the female screw portion comprises at least a pair of blocks and an elastic body interposed between the pair of blocks, each of the pair of blocks is provided with a screw groove piece, the screw hole is closed by the biasing force of each screw groove piece by the elastic body, and the screw hole can be expanded by the compression of the elastic body due to the pressing of at least one of the pair of blocks, which relatively separates each screw groove piece in the pressing direction. Furthermore, in the present invention, a mounting device may be provided in the gap between the connecting ends of the pair of blocks constituting the female screw portion, which is inserted from the outer shell portion, and the female screw portion may be made irremovable from the outer shell portion by the mounting device. Furthermore, in the present invention, defects may be provided on both circumferential edges of the screw groove piece. [Effects of the Invention]

[0007] According to the present invention, the labor required for fastening nuts during the fixing of suspended scaffolding can be reduced, thereby improving the workability of fixing suspended scaffolding. [Brief explanation of the drawing]

[0008] [Figure 1] A schematic diagram illustrating the scaffolding installation method according to the present invention. [Figure 2] A schematic perspective view of the expanding / contracting nut according to Example 1. [Figure 3] A schematic cross-sectional view showing the usage image of the expansion / contraction nut according to Example 1. [Figure 4] A schematic perspective view showing the usage image of the expansion / contraction nut according to Example 1. [Figure 5] A schematic perspective view of the expanding / contracting nut according to Example 2. [Figure 6] A schematic cross-sectional view showing the usage image of the expansion / contraction nut according to Example 2. [Figure 7] A schematic perspective view of the expanding / contracting nut according to Example 3. [Figure 8] A schematic perspective view of the expanding / contracting nut according to Example 4. [Figure 9] A schematic cross-sectional view of the expanding / contracting nut according to Example 4. [Figure 10] A schematic diagram showing the method of securing suspended scaffolding. [Modes for carrying out the invention]

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0010] <1> Suspended scaffolding (Figure 1) The suspended scaffolding X used in the method for installing suspended scaffolding according to the present invention comprises at least a scaffolding body X1, a long threaded rod X2 extending substantially horizontally toward the rear of the scaffolding body X1, a hook X3 having a through hole that can be inserted into the threaded rod X2, and an expandable / contractable nut X4 configured to be able to be inserted into and screwed onto the threaded rod X2 by expanding and contracting the screw hole. When installing the suspended scaffolding X, the hook X3 is attached to the structure to be installed (corresponding to the flange of the structural steel Y in Figure 1), and the movement of the hook X3 on the threaded rod X2 is restricted by an expandable / contractable nut X4 separately attached to the threaded rod X2, thereby fixing the suspended scaffolding X to the structure.

[0011] <2> Expanding / contracting nut (Figure 1) In the present invention, the structure of the expansion and contraction nut X4 can adopt any outer shape and expansion and contraction mechanism as long as it is a mechanism capable of realizing the expansion and closing of the screw hole provided in the nut. When the screw hole is closed, it can be meshed with the screw rod X2 to rotate and screw the expansion and contraction nut X4. When the screw hole is expanded, the meshing with the screw rod X2 is released, and the expansion and contraction nut X4 can be moved to any position of the screw rod X2 without a rotating operation.

[0012] <3>Installation procedure (Fig. 1) When installing the suspension scaffold X, move the expansion and contraction nut X4 in an expanded state to the vicinity of the hook X3 without a rotating operation, and then close the expansion and contraction nut X4 to mesh it with the screw rod X2, and position the expansion and contraction nut X4 with the screw rod X2, so that the suspension scaffold X can be fixed to the section steel Y.

[0013] In addition, if necessary, the expanded and contracted nut X4 after closing can be further screwed and tightened toward the hook X3 side to more firmly lock the section steel Y by the hook X3.

[0014] <4>Summary As described above, the installation method of the suspension scaffold according to the present invention does not require continuously screwing the expansion and contraction nut X4 for regulating the position of the hook X3 inserted into the screw rod X2 along with the installation of the suspension scaffold from the free end of the screw rod X2 to a predetermined position, so that labor saving in the fastening work can be realized and the workability is significantly improved.

Example

[0015] Next, an example of the expansion and contraction nut used in the installation method of the suspension scaffold according to the present invention will be described.

[0016] <1>Overall structure (Fig. 2) The expansion and contraction nut according to this embodiment has at least an outer shell part A constituting the outer shell part of the nut and an internal thread part B accommodated in the outer shell part A. Hereinafter, the details of each part will be described.

[0017] <2> Outer shell (Figure 2) Outer shell A is a component that makes up the outer shell of the nut. In the present invention, the shape of the outer shell A is not particularly limited, and any shape can be adopted as long as it has a structure that can accommodate the female screw portion B, which will be described later, inside the outer shell A, and is capable of fastening. The outer shell A in this embodiment has a hollow housing portion 10 and an overhang portion 20 that protrudes from the outer surface of the housing portion 10.

[0018] <2.1> Storage area (Figure 2) The housing section 10 is a component for housing the female screw portion. In this embodiment, the housing portion 10 has a cylindrical shape with a substantially square cross-section, and one of the four faces constituting the outer surface of the housing portion 10 has an insertion hole 11 formed on one of the opposing faces, which is large enough to allow the threaded rod X2 to be inserted. Furthermore, the housing section 10 has a mounting hole (first mounting hole 12) into which a mounting device 13 (such as a screw or pin) for fixing one of the blocks 30 that constitute the female screw section, which will be described later, is inserted.

[0019] <2.2> Protruding section (Figure 2) The protruding portion 20 is a component that at least has the function of serving as a handle when turning or tightening the nut. In this embodiment, of the four surfaces constituting the outer surface of the housing section 10, protruding portions 20 are provided on the outer side of the other opposing surface, such that the longitudinal direction is substantially perpendicular to the surface direction of the opposing surface.

[0020] <3> Female thread section (Figure 2) The female screw portion B has an expandable screw hole, so that when the screw hole is expanded, contact with the screw rod X2 is released, allowing it to move to a predetermined position without rotation, and when the screw hole is retracted, it engages with the screw rod X2, making it rotatable relative to the screw rod X2. The female screw portion according to this embodiment comprises at least a pair of blocks (one block 30 and the other block 40) housed in the outer shell A, and an elastic body 50 interposed between the pair of blocks.

[0021] <3.1> One block (Figure 2) One block 30, together with the other block 40 (described later), is a component that forms a screw hole. One of the blocks 30 in this embodiment is a member having a substantially concave shape, and a part of a screw hole (screw groove piece 31) is formed in a part of the inner wall of the recessed portion inside the concave shape, and the inner wall opposite the screw groove piece 31 is in contact with one end of the elastic body 50. One block 30 is fitted into the other block 40, which will be described later, via the recessed portion. The recessed portion of one block 30 is provided with sufficient length to allow the fitted other block 40 to slide in a direction perpendicular to the screw axis direction of the screw hole.

[0022] <3.1.1> Fixation to the outer shell One of the blocks 30 is provided with a mounting hole (second mounting hole 32) that communicates with the first mounting hole 12 of the outer shell A. By inserting the mounting fixture 13 through the first mounting hole 12 and the second mounting hole 32 in a state of communication, one of the blocks 30 can be positioned and fixed to the outer shell A. Therefore, in this embodiment, one block 30 is fixed to the outer shell A, and only the other block 40 can be moved to enlarge the screw hole, resulting in a so-called single-sided push structure.

[0023] <3.2> The other block (Figure 2) The other block 40, along with the aforementioned block 30, is a component that constitutes a screw hole. One of the blocks 30 in this embodiment is a member having a substantially inverted concave shape, and a part of a screw hole (screw groove piece 41) is formed in a part of the inner wall of the recessed portion on the inside of the inverted concave shape, and a wall surface that contacts the other end of the elastic body 50 is provided on the back side of the surface on which a part of the screw groove piece 41 is provided. Then, by arranging the aforementioned block 30 and the other block 40 so that their recessed portions interlock, screw holes can be formed using the screw groove pieces 31 and 41 of each block.

[0024] <3.3> Elastic body (Figure 2) The elastic body 50 is a member that is interposed between a pair of blocks 30 and 40 to bias the screw hole formed by the pair of blocks 30 and 40 in the contraction direction. In this embodiment, an elastic body 50 made of a spring is interposed between a wall surface provided on one block 30 and a wall surface provided on the other block 40. A storage groove (Figure 3) for housing and positioning the end of the elastic body may be provided on the wall surface of one block 30. The restoring force of this spring biases the screw holes, each consisting of screw groove pieces 31 and 41, in the contraction direction. When the spring is compressed, the screw groove pieces 31 and 41 of each block 30 and 40 separate, causing the screw holes to expand. Although Figure 2 shows an embodiment in which the elastic body 50 is fixed to the other block 40, the present invention is not limited to the above embodiment. The elastic body 50 may also be fixed to one of the blocks 30, or it may not be fixed to either block and may have a separate and independent configuration.

[0025] <3.4>Shape of screw holes (Figure 2) If the screw holes formed by the aforementioned screw groove pieces 31 and 41 were merely positioned at a predetermined location relative to the screw rod X2, the shape of the screw hole when retracted might be adjusted to be deviated from the normal female screw shape, making it immobile. However, in this embodiment, the screw hole when retracted conforms to the normal female screw shape and is rotatable relative to the male screw, making it possible to further tighten the screw even after it has been attached to any position on the male screw.

[0026] <4> Usage example (Figure 3) Referring to Figure 3, the usage image of the expansion / contraction nut according to this embodiment will be explained.

[0027] (1) Immobile state (retracted state) (Figure 3(a)) In the state shown in Figure 3(a), the other block 40 is pushed out by the biasing force of the elastic body 50 relative to the other block 30 fixed to the outer shell A. As a result, the screw groove piece 41 is pulled towards the screw groove piece 31, forming a retracted screw hole that engages with the screw rod X2 shown by the dashed line and is rotatable. In this state, the expandable / contractable nut can be positioned on the threaded rod X2 by rotating it after insertion. Furthermore, by increasing the elastic force of the elastic body 50, this normal state is firmly maintained, thus suppressing the risk of the nut expanding due to unintended external factors.

[0028] (2) Movable state (expanded state) (Figure 3(b)) In the state shown in Figure 3(b), pressing the other block 40 with a thumb or the like pushes back the other block 40 that has been pushed out by the elastic body 50 relative to the other block 30 which is fixed to the outer shell A. As a result, the screw groove piece 41 separates from the screw groove piece 31, and the screw hole is enlarged so that it is no longer in contact with the screw rod X2 shown by the dashed line. In this state, the expanding / contracting nut can be moved to any position on the threaded rod X2 regardless of whether the expanding / contracting nut is rotated.

[0029] (3) Advantages of the protruding portion 20 (Figure 4) Furthermore, if the elastic force of the elastic body 50 is made stronger, there is a risk that the force required for pressing with the fingers may be insufficient. In this case, one might consider a method of gripping the nut with the palm and fingers to ensure proper pressure, but this method cannot be adopted because the palm of the hand is likely to interfere with the threaded rod X2. Therefore, as in this embodiment, by providing protruding portions 20 that extend upward and downward from the outer shell portion A, as shown in Figure 4, it is possible to assume a posture in which the thumb is placed along the other block 40 and other fingers, such as the index finger, are placed on one or both of the protruding portions 20, allowing the operator's hand to avoid interfering with the screw rod X2 and enabling pressing work to be performed in a manner that makes it easier to apply force with the thumb. Furthermore, when using both hands, the index fingers of both hands can be placed on each protruding portion 20 while the thumbs of both hands press down on the other block 40 (not shown). In this case as well, the hands will not interfere with the threaded rod X2. Therefore, the protruding portion 20 in this embodiment can be used not only as a handle when turning the nut, but also as a finger rest when performing pressing operations.

[0030] <5> summary According to the expandable / contractable nut of this embodiment, when expanding the screw hole, the nut can be moved to any position on the threaded rod X2 without rotational movement, and when contracting the screw hole, the fastening operation can be performed by rotational movement on the threaded rod X2. Therefore, even when used as a substitute for the wing nut e used to fix the suspended scaffolding as shown in Figure 6, it is possible to move the nut when it is expanded and to tighten it after positioning when it is retracted, resulting in a superior safety effect. Furthermore, by providing the protruding portion 20, it becomes easier to introduce pressing force to the other block 40, allowing the elastic force of the elastic body 50 to be set stronger. This also suppresses the risk of the nut expanding due to unintended external factors, thus providing a superior safety effect. [Examples]

[0031] <1> Overall structure (Figure 5) Next, a second embodiment of the expanding and contracting nut according to the present invention will be described. The expansion / contraction nut according to Example 1 is a so-called single-push configuration, while the expansion / contraction nut according to Example 2 differs in that it is a so-called double-push configuration. As shown in Figure 5, in this embodiment, neither the one block 30 nor the other block 40 constituting the female thread portion is fixed to the outer shell A of the expandable nut; therefore, it is not necessary to provide the first mounting hole 12 and the second mounting hole 32 as in Embodiment 1. Furthermore, an elastic body 50 is attached to each of the two blocks 30 and the other block 40, and both elastic bodies 50 are interposed between the opposing blocks.

[0032] <2> Usage example (Figure 6) In the immobile state (retracted state) shown in Figure 6(a), the fastening operation can be performed by rotating the threaded rod X2, similar to the previous embodiment 1. Unlike in Example 1, the female thread portion is not fixed to the outer shell A by the mounting fixture 13 or the like, making it easy to attach and detach the female thread portion to the outer shell A. Furthermore, in the movable state (expanded state) shown in Figure 6(b), the screw holes are expanded by pressing the ends of one block 30 and the other block 40 with the thumb and index finger. [Examples]

[0033] Next, a third embodiment of the expandable / contractable nut according to the present invention will be described. In this embodiment (Figure 7), the housing portion 10 that constitutes the outer shell A is box-shaped, and the female screw portion, similar to that in Embodiment 1, is housed through the opening of this housing portion 10. In this embodiment, while the single-sided mounting configuration is the same as in Embodiment 1, the formation of the first mounting hole 12 and the second mounting hole 32 as in Embodiment 1 is unnecessary. [Examples]

[0034] <1> Overall structure (Figures 8 and 9) Next, a fourth embodiment of the expandable / contractable nut according to the present invention will be described. The expanding and contracting nut according to this embodiment is characterized by at least the following points.

[0035] <2> Feature 1: Position of the mounting bracket (Figures 8 and 9(a)) The mounting fixture 13, which prevents the female screw portion B from detaching from the outer shell portion A, is positioned in the gap secured between the circumferential edges of the screw groove pieces 31 and 41 provided on the pair of blocks (one block 30 and the other block 40) that constitute the female screw portion B. With the above configuration, unlike the first embodiment described above, it is not necessary to provide a second mounting hole 32 in one of the blocks 30, thus reducing the processing cost of the components. Furthermore, when assembling the expandable nut, there is no need to distinguish between one block 30 and the other block 40; the female screw portion B is simply placed in the housing portion 10 of the outer shell portion A before inserting the mounting fixture 13, making the manufacturing process much simpler.

[0036] <3> Feature 2: Formation of defects (Figures 8, 9(b)) The circumferential edges of the screw groove pieces 31 and 41, provided on one block 30 and the other block 40, respectively, which constitute the female screw portion B, are cut out to form missing portions 311 and 411. By providing these missing portions 311 and 411, when pushing in both blocks 30 and 40 to enlarge the screw holes, interference between the inner diameter of the screw holes and the outer diameter of the insertion hole 11 or the male thread of the screw rod X2 can be avoided with a small amount of pushing. [Explanation of Symbols]

[0037] X Suspended scaffolding X1 Scaffolding Body X2 threaded rod X3 Hook X4 Expanding and contracting nut A Outer shell B Female thread section C Male screw 10 Storage Unit 11 Through hole 12 First mounting hole 13 Mounting hardware 20 Overhang 30 One block 31 Screw groove pieces 311 Defect 32 Second mounting hole 33 Storage grooves 40 The other block 41 Screw groove pieces 411 Defect 42 Storage grooves 50 Elastic body a. Suspended scaffolding b. Screw rod c-shaped steel c1 flange d hook e Wing nut

Claims

1. A method for installing suspended scaffolding, A hook with a through hole and an expandable / contractable nut with an expandable / contractible screw hole are inserted into the long threaded rod that constitutes the suspended scaffolding. The expansion / contraction nut comprises at least a pair of blocks and an elastic body interposed between the pair of blocks. Each of the pair of blocks is provided with a screw groove piece that constitutes the screw hole, The screw hole is made expandable from a contracted state by the elastic body by the compression of the elastic body due to the pressing of at least one of the pair of blocks, thereby relatively separating the screw groove pieces in the pressing direction. The method is characterized by moving the expandable / contractible nut on the threaded rod with the screw hole expanded to move the hook to the locking position of the object on which the suspended scaffolding is to be installed, and then fixing the suspended scaffolding by retracting the screw hole to position the nut on the threaded rod. How to install suspended scaffolding.

2. The screw groove piece, which moves by the pressure of the elastic body, is characterized in that a defect is provided on both circumferential edges of the screw groove piece. A method for installing a suspended scaffolding as described in claim 1.

3. The screw groove piece provided on one of the pair of blocks is configured to move when pressed by the elastic body, A method for installing a suspended scaffolding according to claim 1 or 2.

Images