Lifting / lowering device, and method of lifting / lowering appurtenance

Abstract

To solve the problem of the prior art, namely, to use a simple device that can be attached to a power pole, and to reduce a bending moment acting on the power pole, and thereupon to provide a lifting / lowering device capable of lifting / lowering an appurtenance, and a method of lifting / lowering an apparatus or the like using the same.SOLUTION: A lifting / lowering device according to the present invention is a device for lifting an appurtenance to be installed on a pole-like object with an approximately vertical pole axis and for lowering the appurtenance removed from the pole-like object, and comprises a front arm, a rear arm, a top pulley, and winding means. Since the rear arm is arranged near the front arm so that the front arm and the rear arm are oriented in approximately opposite directions, a bending moment on the front arm side that acts on the pole-like object is reduced by a bending moment on the rear arm side.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a technique for installing or removing various equipment on, for example, an electric power pole, and more specifically to a lifting device that can reduce the bending moment acting on an electric power pole when lifting equipment, etc., and a method for lifting equipment, etc. using the same. [Background technology]

[0002] Power plants generate electricity at several thousand to tens of thousands of volts, but to avoid losses due to electrical resistance, the electricity is converted to ultra-high voltage of around several hundred thousand volts before transmission. The voltage is then gradually reduced at various substations, such as ultra-high voltage substations, primary substations, secondary substations, and distribution substations, before being supplied to factories and other facilities, and is further reduced by pole-mounted transformers before being supplied to homes. In any case, the electricity generated at power plants is supplied to users via transmission and distribution lines that use electric wires and cables (hereinafter collectively referred to as "transmission lines, etc."), and naturally, there are a huge number of transmission lines, etc., deployed throughout the country.

[0003] Traditionally, power lines were mainly strung on power poles, but in recent years, undergrounding has been promoted, and for example, in Tokyo's 23 wards, 92.6% of the lines have been undergrounded (as of 2021). However, nationwide, the number of underground sections is still small, at just under 20%, and the current situation is that the majority of power lines are still strung on power poles.

[0004] In addition to transmission lines, power poles are equipped with insulators, cross arms, and pole-mounted transformers. Incidentally, some pole-mounted transformers used up until now have been contaminated with trace amounts of polychlorinated biphenyls (PCBs). However, PCBs are difficult to decompose, with a high boiling point and little solubility in water. Furthermore, due to the risk of harm to human health and the living environment, their new manufacture and import are currently prohibited. Furthermore, the Act on Special Measures Concerning the Promotion of Proper Disposal of Polychlorinated Biphenyl Waste (PCB Special Measures Act), revised in 2016, requires that transformers containing PCBs be disposed of after use, even if they are still in use.

[0005] Typically, when replacing a pole-mounted transformer, special vehicles such as mobile cranes and aerial work platforms are used for work efficiency and safety reasons. However, these special work platforms are required to extend their outriggers during work to ensure stability, which means that a considerable amount of space is required when working with special work platforms, and they cannot be used on narrow roads, for example. For this reason, when replacing a power pole installed on a narrow road, pole-mounted transformers have sometimes been replaced by hand using a chain block.

[0006] However, replacing a pole-mounted transformer manually requires working at a height and lifting a pole-mounted transformer that weighs a considerable amount (e.g., 200 kg), significantly reducing the efficiency and safety of the work. Therefore, various techniques for manually lifting pole-mounted transformers have been proposed. For example, Patent Document 1 proposes a technique for lifting electrical equipment by using a winch, arm, and pulley attached to a power pole to wind up a wire with the winch. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2017-22826 Summary of the Invention [Problem to be solved by the invention]

[0008] The "high-place mounting device for electrical equipment" disclosed in Patent Document 1 hoists electrical equipment (e.g., a pole transformer TF) by placing an arm AM above an electric power pole EP, attaching a pulley PL to the tip of the arm AM that extends from the electric power pole EP, and using a winch WN to reel in a wire rope WR hanging down from the pulley PL, as shown in Fig. 12. This technology allows work to be carried out stably on the ground, at least when hoisting or lowering a pole transformer TF, and also prevents workers from having to stand under the suspended load.

[0009] However, in the technology of Patent Document 1, the arm AM is extended on only one side (the left side in the figure) above the power pole EP, and the pole transformer TF is lifted from its tip, so a bending moment M acts on the power pole EP, as shown in Figure 12. This bending moment M is calculated by multiplying the arm length L by the load (in this case, the weight W of the pole transformer TF), and considering the weight W of the pole transformer TF, it is thought that a considerable bending moment M will act on the power pole EP. If a considerable bending moment M acts on a power pole EP that has deteriorated over time or has a small cross-sectional force, bending tensile stress or bending compressive stress will be generated in the power pole EP, which may result in serious damage.

[0010] The object of the present invention is to solve the problems associated with the prior art, that is, to provide a lifting device that uses a simple device that can be attached to a power pole, and that can raise and lower an attached object while reducing the bending moment acting on the power pole, and a method for raising and lowering equipment, etc. using the same. [Means for solving the problem]

[0011] The present invention was made based on an unprecedented idea that by extending arms on both sides like a balance and hanging ropes from the ends of each arm, the bending moment acting due to the load on the left side of the rope is reduced by the bending moment acting due to the load on the right side of the rope.

[0012] The lifting device of the present invention is a device for lifting an object to be installed on a columnar object whose column axis is substantially vertical (including vertical), and for suspending an object removed from the columnar object, and is equipped with a front arm, a rear arm, a top pulley, and a hoisting means. The front arm has a front pulley attached to its tip and is attached to the columnar object in a substantially horizontal (including horizontal) position. The rear arm has a rear pulley attached to its tip and is attached to the column in a substantially horizontal (including horizontal) position. The top pulley is a pulley attached to the top of the column, and the hoisting means is a means for winding and unwinding the suspension rope. The suspension rope pulled out from the hoisting means is wound around the rear pulley, then around the top pulley, and then again around the front pulley to hang down. The object attached to the tip of the suspension rope rises when the hoisting means winds the suspension rope, and descends when the hoisting means unwinds the suspension rope. At this time, the front arm and rear arm are positioned so that they are oriented in approximately opposite directions (including opposite directions), and the rear arm is positioned near the front arm (at about the same height), so the bending moment acting on the pillar-like object on the front arm side is reduced by the bending moment acting on the pillar-like object on the rear arm side.

[0013] The lifting device of the present invention may further include a support attached to the column, the support being attached to the top pulley, and the forearm in this case may be detachably attached to the column attached to the column.

[0014] The lifting device of the present invention may further include a slide locking body provided with a suspension pulley. This slide locking body is attached to the front arm and moves along the front arm. In this case, the suspension rope wound around the front pulley is further wound around the suspension pulley and hangs down.

[0015] The lifting device of the present invention may further include an assembly arm on which an assembly pulley is provided. The assembly arm is attached to a column-like object above the front arm. In this case, the front arm can be lifted and lowered using an assembly hoisting rope wound around the assembly pulley.

[0016] The method for raising and lowering a mounted object of the present invention is a method for lifting an object to be installed on a pillar and for suspending an object removed from the pillar, and includes a front arm installation step, a rear arm installation step, a top pulley installation step, a hoisting means installation step, and a hoisting rope arrangement step. In the front arm installation step, a front arm that is positioned approximately horizontal (including horizontal) is attached to the pillar, and in the rear arm installation step, a rear pulley that is positioned approximately horizontal (including horizontal) is attached to the pillar. In the top pulley installation step, the top pulley is attached to the top of the pillar, and in the hoisting means installation step, the hoisting means is installed. In the hoisting rope arrangement step, the hoisting rope pulled out from the hoisting means is wound around the rear pulley, then around the top pulley, and again around the front pulley, and arranged so as to hang down. The front arm and rear arm are arranged so as to face approximately opposite (including opposite) directions from the pillar, and the rear arm is arranged near (at approximately the same height as) the front arm. When the hoisting means winds up the suspension rope, the bending moment acting on the pillar-like object on the front arm side is reduced by the bending moment acting on the pillar-like object on the rear arm side, and the attached object attached to the end of the suspension rope rises. On the other hand, when the hoisting means unwinds the suspension rope, the bending moment acting on the pillar-like object on the front arm side is reduced by the bending moment acting on the pillar-like object on the rear arm side, and the attached object attached to the end of the suspension rope descends.

[0017] The method for raising and lowering a mounted object of the present invention can also be a method that further includes an assembly arm installation step. In this assembly arm installation step, before the front arm installation step, the assembly arm is attached to the columnar object above the front arm. In this case, in the front arm installation step, the assembly suspension rope is wound around the assembly pulley, and one end of the assembly suspension rope is pulled up to pull up the rear arm attached to the other end of the assembly suspension rope, and then the front arm is attached to the columnar object. [Effects of the Invention]

[0018] The lifting device and the method for lifting an attached object according to the present invention have the following advantages. (1) During the work of replacing a pole-mounted transformer, the bending moment acting on the power pole is reduced, thereby suppressing damage to the power pole. (2) Compared to conventional techniques that use chain blocks, etc., pole-mounted transformers can be replaced quickly and safely. (3) The upper transformer can be easily replaced even on power poles installed on narrow roads. [Brief explanation of the drawings]

[0019] [Figure 1] 10A and 10B are side views schematically illustrating the operation of the lifting device of the present invention. [Figure 2] FIG. 2 is a side view showing the lifting device of the present invention. [Figure 3] (a) is a side view of the forearm attached to the power pole, viewed in the direction of the secondary axis (the horizontal axis perpendicular to the axis on which the forearm is positioned), and (b) is a plan view of the forearm attached to the power pole, viewed from above. [Figure 4] (a) is a side view of the rear arm attached to the power pole, viewed in the direction of the counter-axis, and (b) is a plan view of the rear arm attached to the power pole, viewed from above. [Figure 5] FIG. 1 is a side view of a sliding stop attached to a power pole, viewed in the direction of the counter axis. [Figure 6](a) is a side view of the assembly arm attached to the power pole, viewed in the direction of the counter-axis, and (b) is a plan view of the assembly arm attached to the power pole, viewed from above. [Figure 7] (a) is a front view showing the lifting jig, and (b) is a plan view of the lifting jig seen from above. [Figure 8] FIG. 1 is a flow chart showing the flow of main steps up to the removal of a pole-mounted transformer using the lifting device of the present invention. [Figure 9] FIG. 2 is a step diagram showing the process of removing a pole-mounted transformer using the lifting device of the present invention. [Figure 10] FIG. 1 is a flow chart showing the flow of main steps up to installing a pole transformer on a power pole using the lifting device of the present invention. [Figure 11] FIG. 2 is a step diagram showing the process of installing a pole transformer on a power pole using the lifting device of the present invention. [Figure 12] FIG. 1 is a side view showing a schematic diagram of a situation in which a bending moment acts on a power pole as a result of lifting electrical equipment using conventional technology. DETAILED DESCRIPTION OF THE INVENTION

[0020] An example of an embodiment of the lifting device and method for lifting an attached object of the present invention will be described with reference to the drawings. The present invention is a technology for installing and removing an "attached object" on a "pillar-like object." Here, a "pillar-like object" is a column-like object whose longitudinal axis (hereinafter referred to as "pillar axis") is large compared to its cross-sectional dimension, and which is installed so that its column axis is approximately vertical (including vertical). An attached object refers to various objects that are installed on a pillar. For convenience, the following description will be given using an example in which the pillar-like object is a power pole EP and the attached object is a pole-mounted transformer TF.

[0021] 1.Overview FIG. 1 is a side view schematically illustrating the operation of the lifting device 100 of the present invention. The lifting device 100 of the present invention is used by attaching various components to a power pole EP. For example, two arms are attached to the top of the power pole EP. These arms are arranged to extend in opposite directions across the power pole EP and to be roughly collinear in a plan view. For convenience, the horizontal axis along which the arms are arranged will be referred to as the "main axis," and the horizontal axis perpendicular to the "main axis" (in the depth direction of the drawing) will be referred to as the "secondary axis." One of the main axes (the left side in the drawing) will be referred to as the "front," and the opposite side (the right side in the drawing) will be referred to as the "rear." Furthermore, of the two arms, the one positioned forward of the power pole EP will be referred to as the "front arm 110," and the one positioned rearward of the power pole EP will be referred to as the "rear arm 120." That is, the front arm 110 and the rear arm 120 are arranged so as to extend in opposite directions across the power pole EP, and so as to be generally on the same straight line in a plan view.

[0022] Furthermore, the forearm 110 and the rear arm 120 are arranged at similar heights, in other words, the rear arm 120 is arranged near the forearm 110 in the vertical direction of the power pole EP. For example, as shown in FIG. 1, the forearm 110 and the rear arm 120 can be arranged at the same or approximately the same height, or the rear arm 120 can be arranged slightly lower than the forearm 110, or the rear arm 120 can be arranged slightly higher than the forearm 110. Note that the distance (height difference) between the forearm 110 and the rear arm 120 is preferably 1 m or less, and more preferably 0.5 m or less.

[0023] A pulley (hereinafter referred to as the "front pulley 111") is provided at the tip of the front arm 110 (the left end in the figure), a pulley (hereinafter referred to as the "rear pulley 121") is also provided at the tip of the rear arm 120 (the right end in the figure), and a pulley (hereinafter referred to as the "top pulley 130") is also attached to the top of the power pole EP. In addition, hoisting means 140 is attached to the rear side of the lower part of the power pole EP, and a hoisting rope 141 drawn out from this hoisting means 140 is wound around the rear pulley 121, the top pulley 130, and the front pulley 111 in that order, and hangs down from the front pulley 111. Then, a pole transformer TF on the ground is attached to the lower end (hereinafter referred to as the "front end") of the hoisting rope 141 hanging down from the front pulley 111, and when the hoisting means 140 takes up the hoisting rope 141, the pole transformer TF is lifted up. At this time, the bending moment acting on the power pole EP is reduced by the effect of arranging the front arm 110 and the rear arm 120 so that they are on the same straight line but in opposite directions, and so that the rear arm 120 is in the vicinity of (at approximately the same height as) the front arm 110. In other words, although a bending moment (forward bending moment) due to the weight of the pole-mounted transformer TF acts on the power pole EP, a bending moment (rear bending moment) due to the tensile force of the suspension rope 141 also acts on the power pole EP because the hoisting means 140 supports the suspension rope 141. And, because these bending moments are in opposite directions, a bending moment acting on the power pole EP is equal to the forward bending moment minus the rear bending moment.

[0024] 2. Lifting device Next, the lifting device 100 of the present invention will be described in detail with reference to the drawings. The method for lifting and lowering an attached object of the present invention is a method for lifting and lowering a pole transformer TF (attached object) using the lifting device 100 of the present invention. Therefore, the lifting device 100 of the present invention will be described first, and then the method for lifting and lowering an attached object of the present invention will be described in detail.

[0025] 2 is a side view showing the lifting device 100 of the present invention. As shown in this figure, the lifting device 100 of the present invention is configured to include a front arm 110, a rear arm 120, a top pulley 130, and a hoisting means 140, and may further include a support body 150, a slide locking body 160, an assembly arm 170, a rear intermediate arm 180, etc.

[0026] The main elements constituting the lifting device 100 of the present invention will be described below.

[0027] (forearm) FIG. 3 shows a forearm 110 attached to a power pole EP, where (a) is a side view seen in the counter-axial direction and (b) is a plan view seen from above. The forearm 110 is a so-called shaft member whose axial dimension is larger than its cross-sectional dimension, and can be formed using shaped steel such as H-shaped steel or channel steel. As shown in FIG. 3(a), the forearm 110 is attached to the top of the power pole EP with its axial direction approximately horizontal (including horizontal). Note that the forearm 110 can be attached to the power pole EP using a conventional "utility pole band" or via a support 150.

[0028] The support 150 includes a forearm support 151, a top pulley support 152, and a support band 153, and is attached to the power pole EP using the support band 153. A conventional "utility pole band" can be used for the support band 153. The forearm support 151 is hollow and tubular, and can be made of, for example, a square steel pipe. The forearm 110 can be attached to the power pole EP via the support 150 by inserting the forearm 110 into the hollow portion of the forearm support 151 connected to the support band 153. The forearm 110 can also be easily removed from the power pole EP by pulling out the forearm 110 inserted into the hollow portion of the forearm support 151. The forearm 110 is inserted into and pulled out of the forearm support 151 by a worker standing on the utility pole scaffold. For this reason, a grip 113, shown in FIG. 3, may be provided on the top surface of the forearm 110. The operator can use this grip 113 to lift the forearm 110 and then perform insertion or removal operations.

[0029] The top pulley support 152 connected to the forearm support 151 is composed of a member that assumes a substantially vertical (including vertical) position and a member that assumes a substantially horizontal (including horizontal) position (hereinafter simply referred to as the "horizontal member"), and is L-shaped in side view. A top pulley 130 is installed in advance on the top of the horizontal member of the top pulley support 152. This top pulley 130 rotates around a substantially horizontal axis (including the horizontal axis) within a substantially vertical plane (including the vertical plane) in the main axis direction, and guides the suspension rope 141 in the main axis direction. While two top pulleys 130 are installed in FIG. 3 , this is not a limitation; one top pulley 130 or three or more top pulleys 130 may also be installed. When the support 150 is attached to the power pole EP, the horizontal member of the top pulley support 152 is positioned to cover the top of the power pole EP, and as a result, the top pulley 130 is positioned at the top of the power pole EP.

[0030] A front pulley 111 is provided at the tip (the end farther from the power pole EP) of the forearm 110 attached to the power pole EP. This front pulley 111 rotates around a substantially horizontal axis (including the horizontal axis) within a substantially vertical plane (including the vertical plane) in the main axis direction, and guides the suspension rope 141 in the up and down direction. A slide locking body 160, which will be described later, can also be attached to the forearm 110, and a suspension part 112 for hoisting the forearm 110 itself can also be provided.

[0031] (rear arm) FIG. 4 shows a rear arm 120 attached to a power pole EP, where (a) is a side view seen in the sub-axial direction and (b) is a plan view seen from above. The rear arm 120 is a so-called shaft member whose axial dimension is larger than its cross-sectional dimension, and can be formed using shaped steel such as H-shaped steel or channel steel. The rear arm 120 can have the same axial length (length in the axial direction) as the front arm 110, or it can have an axial length slightly shorter than that of the front arm 110. As shown in FIG. 4(a), the rear arm 120 is attached to the top of the power pole EP with its axial direction approximately horizontal (including horizontal).

[0032] The rear arm 120 is connected to a rear arm support 122, and the rear arm support 122 is connected to a rear arm band 123. The rear arm band 123 is a jig for attachment to a power pole EP, and a conventional "utility pole band" can be used. When the rear arm band 123 is attached to the power pole EP, the rear arm 120 is attached to the power pole EP via the rear arm support 122, so to speak.

[0033] A rear pulley 121 is provided at the tip (the end remote from the power pole EP) of the rear arm 120 attached to the power pole EP. This rear pulley 121 rotates around a substantially horizontal axis (including the horizontal axis) within a substantially vertical plane (including the vertical plane) in the main axis direction, and guides the suspension rope 141 in the up and down direction.

[0034] The lifting device 100 of the present invention may also have a rear intermediate arm 180 attached to the power pole EP at a position lower than the rear arm 120. This rear intermediate arm 180 has a similar configuration to the rear arm 120, such as having a rear intermediate pulley 181 attached to its tip. Therefore, like the rear pulley 121, the rear intermediate pulley 181 rotates around a substantially horizontal axis (including the horizontal axis) within a substantially vertical plane (including the vertical plane) in the main shaft direction, and guides the suspension rope 141 in the up and down direction.

[0035] (Hoisting means) The hoisting means 140 is capable of winding up and unwinding the suspension rope 141, and can be a manual hand winch with a rotating handle, or of course, an electric winch, etc. This hoisting means 140 can be installed by attaching it to the lower part on the rear side of the power pole EP. Alternatively, the hoisting means 140 can be installed on the ground or a predetermined pedestal, etc. Then, the suspension rope 141 pulled out from this hoisting means 140 goes upward and is wound around the rear intermediate pulley 181 and the rear pulley 121, then wound around the top pulley 130, and further wound around the front pulley 111, and is arranged so as to hang down from the front pulley 111. Note that various rope materials, including wire rope, can be used for this suspension rope 141.

[0036] (Slide locking body) Figure 5 is a side view of the sliding engagement body 160 attached to the power pole EP, viewed in the direction of the secondary axis. As shown in this figure, the sliding engagement body 160 is attached to the underside of the forearm 110 and is composed of a hanging pulley 161, a moving body 162, and a retraction means 163. Of these, the moving body 162 slides back and forth along the forearm 110 (i.e., along the direction of the primary axis), and therefore preferably has a rotating body such as a roller or tire; in the example of Figure 5, a trolley is used as the moving body 162. Furthermore, the moving body 162 needs to be attached to the forearm 110 so as to be able to slide; for example, it is preferable to use the lower flange of the forearm 110, which is made of shaped steel (such as an H-shaped steel), and attach it so that it is suspended, so to speak.

[0037] The suspending pulley 161 rotates around a substantially horizontal axis (including the horizontal axis) within a substantially vertical plane (including the vertical plane) in the main axis direction, and guides the suspending rope 141 in the up and down direction. When the lifting device 100 is equipped with the slide locking body 160, the suspending rope 141 that has passed through the top pulley 130 is wound around the front pulley 111 so as to be folded back as shown in FIG. 5, and then wound around the suspending pulley 161, and hangs down from this suspending pulley 161.

[0038] The retraction means 163 slides the moving body 162 back and forth, and in the example of Fig. 5, a chain block is used as the retraction means 163. In this case, the chain of the chain block is connected to the moving body 162, and the moving body 162 can be slid back and forth by an operator operating it. Note that when a self-propelled moving body 162 is used, such as an electric trolley, the retraction means 163 can be omitted.

[0039] (Assembly arm) Figure 6 shows an assembly arm 170 attached to a power pole EP, where (a) is a side view seen in the sub-axis direction and (b) is a plan view seen from above. The assembly arm 170 is a so-called shaft member whose axial dimension is larger than its cross-sectional dimension, and can be formed using shaped steel such as H-shaped steel or channel steel, or steel pipes (such as square steel pipes). As shown in Figure 6(a), the assembly arm 170 is attached to the top of the power pole EP with its axial direction approximately horizontal (including horizontal).

[0040] The assembly arm 170 is connected to an assembly arm support 172, and the assembly arm support 172 is connected to an assembly arm band 173. Of these, the assembly arm band 173 is a jig for attachment to the power pole EP, and a conventionally used "utility pole band" can be used. When the assembly arm band 173 is attached to the power pole EP, the assembly arm support 172 is, so to speak, attached to the power pole EP via the assembly arm band 173.

[0041] The assembly arm 170 is used to lift the forearm 110, rear arm 120, support 150, and other components when attaching them to the power pole EP, and also to suspend the forearm 110 and other components installed on the power pole EP. For this purpose, a pulley (hereinafter referred to as the "assembly pulley 171") is attached to the upper part of the assembly arm 170. This assembly pulley 171 rotates around a substantially horizontal axis (including the horizontal axis) within a substantially vertical plane (including the vertical plane) in the sub-axis direction. Note that, since the assembly arm 170 is used to lift various components, it is preferable to position it above the forearm 110 and rear arm 120 and in a position that does not overlap with the forearm 110 in a plan view. For example, in FIG. 6(b), the assembly arm 170 is positioned on the right side when viewed forward from the power pole EP, and does not overlap with the forearm 110, which is positioned approximately in the center of the power pole EP, in a plan view. Furthermore, the assembly arm 170 can be attached rotatably around the axis of the power pole EP so that the position of the assembly arm 170 can be changed depending on the surrounding environment of the power pole EP.

[0042] When using the assembly arm 170 to hoist the forearm 110 and the like, a rope different from the hoisting rope 141 (hereinafter referred to as the "assembly hoisting rope 174") is used. That is, the assembly hoisting rope 174 is wound around the assembly pulley 171, the forearm 110 is attached to one end of the assembly hoisting rope 174, and then a worker on the ground hoists the forearm 110 by pulling down the other end of the assembly hoisting rope 174. At this time, the other end of the assembly hoisting rope 174 can be pulled down manually, or, of course, it can also be pulled down using a manual hand winch, an electric winch, or the like.

[0043] (hanging jig) When lifting and lowering the pole transformer TF, the pole transformer TF is attached to the front end of the hoisting rope 141. At this time, the hoisting rope 141 can be attached to the pole transformer TF by engaging the hook at the front end of the hoisting rope 141 with a sling wire rope installed on the pole transformer TF. Alternatively, the hoisting rope 141 can be attached to the pole transformer TF using a hoisting jig 190 shown in Fig. 7. Fig. 7 shows the hoisting jig 190, where (a) is a front view and (b) is a plan view seen from above.

[0044] As shown in Figure 7, the hoisting jig 190 is composed of a beam 191 and a hoisting member 192. The hoisting members 192 are attached to both ends of the beam 191 using bolts or the like. The hoisting members 192 have plate-like members with small holes, and the pole transformer TF can be attached to the hoisting jig 190 by connecting the small holes to parts of the pole transformer TF with bolts or the like. Then, by engaging the hooks at the front ends of the hoisting ropes 141 with the hoisting jig 190, the hoisting ropes 141 are attached to the pole transformer TF via the hoisting jig 190, so to speak. Note that because the external dimensions (particularly the width) differ depending on the pole transformer TF, it is desirable to make the position of the hoisting member 192 attached to the beam 191 variable. For example, in FIG. 7(b), a portion of the hanging member 192 is inserted into a long hole LH provided in a beam 191, and the position of the hanging member 192 is adjusted within the range of this long hole LH.

[0045] 3. How to raise and lower attached objects Next, the method for raising and lowering a mounted object of the present invention will be described in detail with reference to Figures 8 to 11. The method for raising and lowering a mounted object of the present invention is a method for lifting and lowering a pole transformer TF (mounted object) using the lifting device 100 described up to this point. Therefore, we will avoid any explanation that overlaps with the content explained for the lifting device 100, and will mainly explain the content unique to the method for raising and lowering a mounted object of the present invention. In other words, the content not described here is the same as that explained in "2. Lifting Device."

[0046] Figure 8 is a flow diagram showing the flow of the main steps up to the removal of an existing pole transformer TF using the lifting device 100 of the present invention, and Figure 9 is a step diagram showing those steps. When removing a pole transformer TF using the lifting device 100, a worker standing on a utility pole scaffold first attaches an assembly arm 170 to the top of the power pole EP (Step 201 in Figure 8), and then winds an assembly suspension rope 174 around an assembly pulley 171 on the assembly arm 170.

[0047] After the assembly hoisting rope 174 is wound around the assembly pulley 171, the support 150 is attached to one end of the assembly hoisting rope 174, and the support 150 is lifted by pulling down the other end of the assembly hoisting rope 174. Once the support 150 has been lifted to a predetermined height, a worker standing on the pole scaffold uses the support band 153 to attach the support 150 to the top of the power pole EP. At this time, because the top pulley 130 is already installed on the support 150, once the support 150 is attached to the power pole EP, the top pulley 130 is positioned at the top of the power pole EP. Once the support 150 is attached to the power pole EP, the forearm 110 is lifted using the assembly hoisting rope 174, as shown in FIG. 9(a), and the worker standing on the pole scaffold attaches the forearm 110 to the top of the power pole EP (Step 202 in FIG. 8). At this time, the worker can use the gripping portion 113 to lift the forearm 110 and insert the forearm 110 into the hollow portion of the forearm support 151 to attach it. Once the forearm 110 is attached to the power pole EP (or installed on the ground or a pedestal, etc.), the slide stopper 160 is attached to the underside of the forearm 110. Of course, the slide stopper 160 can also be attached to the forearm 110 on the ground beforehand, and then the forearm 110 can be lifted and installed.

[0048] Additionally, the rear arm 120 is lifted using the assembly hoisting rope 174, and a worker standing on the pole scaffolding attaches the rear arm 120 to the top of the power pole EP using the rear arm band 123 (Step 203 in FIG. 8). As described above, the front arm 110 and the rear arm 120 are positioned so that they are on the same straight line but facing in opposite directions, and the rear arm 120 is positioned near (at approximately the same height as) the front arm 110. Once the rear arm 120 has been attached to the power pole EP, the rear intermediate arm 180 is similarly attached to the power pole EP at a position lower than the rear arm 120, and the hoisting means 140 is attached to the rear side of the power pole EP, below it (Step 204 in FIG. 8). The hoisting rope 141 pulled out from the hoisting means 140 is then wound around the rear intermediate pulley 181 and the rear pulley 121, then wound around the top pulley 130, then wound around the front pulley 111, and further wound around the hoisting pulley 161, and arranged to hang down from the hoisting pulley 161 (Step 205 in Figure 8).

[0049] When the assembly of the lifting device 100 is completed by performing the series of steps described up to this point, the front end of the suspending rope 141 hanging down from the suspending pulley 161 is attached to the existing pole transformer TF, as shown in FIG. 9(b). At this time, the suspending rope 141 can also be attached to the pole transformer TF using the suspending jig 190 shown in FIG. 7. Once the suspending rope 141 is attached to the pole transformer TF, a worker standing on the pole scaffold operates the retraction means 163 to slide the pole transformer TF forward, as shown in FIG. 9(c) (Step 206 in FIG. 8). Then, a worker standing on the ground operates the hoisting means 140 to suspend the pole transformer TF down to the ground, as shown in FIG. 9(d) (Step 207 in FIG. 8).

[0050] Fig. 10 is a flow diagram showing the flow of the main steps up to installing a pole transformer TF on a power pole EP using the lifting device 100 of the present invention, and Fig. 11 is a step diagram showing those steps. When installing a pole transformer TF on a power pole EP using the lifting device 100, the lifting device 100 is first assembled by performing the series of steps (Step 201 to Step 205) shown in Fig. 8. However, if the lifting device 100 has already been installed on the power pole EP, such as in the case where the pole transformer TF is to be installed on the power pole EP immediately after being removed, then of course this assembly work is not necessary.

[0051] When the assembly of the lifting device 100 is complete, the front end of the suspending rope 141 hanging down from the suspending pulley 161 is attached to the existing pole transformer TF. At this time, the suspending rope 141 can also be attached to the pole transformer TF using the suspending jig 190 shown in FIG. 7. Once the suspending rope 141 is attached to the pole transformer TF, a worker standing on the ground operates the hoisting means 140 to hoist the pole transformer TF as shown in FIG. 11(a) (Step 301 in FIG. 10). Once the pole transformer TF has been hoisted to a predetermined height, a worker standing on the pole scaffold operates the retraction means 163 to slide the pole transformer TF backward as shown in FIG. 11(b) (Step 302 in FIG. 10). Then, as shown in FIG. 11(c), the suspending rope 141 is removed from the pole transformer TF, and the pole transformer TF is fixed in a predetermined position.

[0052] Once the pole transformer TF is fixed in place, the lifting device 100 is removed. To do this, first the suspending rope 141 is removed (Step 303 in FIG. 10), and then the assembly suspending rope 174 is wound around the assembly pulley 171. Next, various components are removed from the power pole EP and lowered to the ground. Specifically, a worker standing on the pole scaffolding removes the rear arm 120 from the power pole EP, attaches the rear arm 120 to one end of the assembly suspending rope 174, and pulls up the other end of the assembly suspending rope 174 to lower the rear arm 120 to the ground (Step 304 in FIG. 10).

[0053] Furthermore, a worker standing on the pole scaffolding uses the gripping portion 113 to hold the forearm 110 and removes it from the forearm support 151. Next, as shown in FIG. 11(d), the forearm 110 is lowered to the ground using the assembly suspending rope 174 (Step 305 in FIG. 10). Similarly, a worker standing on the pole scaffolding detaches the support 150 from the power pole EP and uses the assembly suspending rope 174 to lower the support 150 to the ground. Finally, the hoisting means 140 is removed from the power pole EP (or pedestal, etc.) (Step 306 in FIG. 10), and the worker standing on the pole scaffolding removes the assembly arm 170 from the power pole EP (Step 307 in FIG. 10). [Industrial Applicability]

[0054] The lifting device and method for lifting attached objects of the present invention can be used when installing or removing various attached objects on various pillar-shaped objects, and are particularly suitable for use when replacing transformers that have PCBs mixed in. Considering that the present invention allows for efficient transformer replacement, which in turn allows for the proper maintenance of electricity, a social infrastructure, it can be said to be an invention that can be expected to not only be used industrially but also make a significant contribution to society. [Explanation of symbols]

[0055] 100 Lifting device of the present invention 110 (lifting device) front arm 111 (forearm) front pulley 112 (forearm) suspension part 113 (forearm) grip 120 Rear arm (of lifting device) 121 (rear arm) posterior pulley 122 (rear arm) rear arm support 123 (rear arm) rear arm band 130 (elevating device) top pulley 140 (of lifting device) hoisting means 141 (hoisting means) suspension rope 150 (Lifting device) support 151 (support) forward arm support 152 (of support) top pulley support 153 (support) support band 160 (elevating device) slide locking body 161 (Slide locking body) hanging pulley 162 (Slide locking body) moving body 163 (Slide locking body) retraction means 170 (elevator) assembly arm 171 (Assembly arm) assembly pulley 172 (of assembly arm) assembly arm support 173 (Assembly arm) Assembly arm band 174 (Lifting device) assembly rope 180 Rear intermediate arm (of lifting device) 181 (rear intermediate arm) rear intermediate pulley 190 (lifting device) lifting jig 191 (Lifting jig) beam 192 (of a lifting jig) AM Arm EP power pole LH (hanging jig) long hole PL Pulley TF pole transformer WN Winch WR Wire Rope

Claims

1. A device for lifting an attachment to be installed on a column whose axis is vertical or approximately vertical, and for suspending the attachment after it has been removed from the column, a front arm that is horizontal or approximately horizontal and attached to the columnar object, and has a front pulley at its tip; A rear arm that is horizontal or approximately horizontal and attached to the columnar object, and has a rear pulley at its tip; a top pulley attached to the top of the column; and a hoisting means for winding and unwinding the suspension rope, The hoisting rope pulled out from the hoisting means is wound around the rear pulley, wound around the top pulley, and further wound around the front pulley to hang down, The object attached to the tip of the hoisting rope rises when the hoisting means winds up the hoisting rope, and falls when the hoisting means unwinds the hoisting rope, The front arm and the rear arm are oriented in opposite or substantially opposite directions, and the rear arm is disposed in the vicinity of the front arm, so that a bending moment acting on the pillar-like object on the front arm side is reduced by a bending moment acting on the pillar-like object on the rear arm side. A lifting device characterized by:

2. Further comprising a support attached to the pillar; The support is attached to the top pulley, the forearm may be removably attached to the post attached to the post; 2. The lifting device according to claim 1.

3. a slide locking body attached to the front arm, movable along the front arm, and provided with a suspension pulley; The suspension rope wound around the front pulley is further wound around the suspension pulley and hangs down.

2. The lifting device according to claim 1.

4. An assembly arm is attached to the column above the front arm and is provided with an assembly pulley; The front arm can be lifted and lowered by using an assembly hoisting rope wound around the assembly pulley.

2. The lifting device according to claim 1.

5. A method for lifting an attachment to be installed on a column whose axis is vertical or approximately vertical, and then suspending the attachment after it has been removed from the column, comprising: a front arm installation process in which a front arm having a front pulley at its tip is attached to the columnar object while being positioned horizontally or approximately horizontally; a rear arm installation process in which a rear arm having a rear pulley at its tip is attached to the columnar object while being positioned horizontally or approximately horizontally; a top pulley installation step of attaching a top pulley to the top of the column; a hoisting means installation process for installing a hoisting means for winding and unwinding the suspension rope; a suspension rope arrangement step of winding the suspension rope drawn out from the hoisting means around the rear pulley, the top pulley, and further around the front pulley and arranging it so as to hang down, the front arm and the rear arm are positioned to face in opposite or substantially opposite directions from the post; The rear arm is disposed adjacent to the front arm, When the hoisting means winds up the suspension rope, the bending moment acting on the pillar-like object on the front arm side is reduced by the bending moment acting on the pillar-like object on the rear arm side, and the attached object attached to the tip of the suspension rope rises, When the hoisting means unwinds the suspension rope, the bending moment acting on the pillar-like object on the front arm side is reduced by the bending moment acting on the pillar-like object on the rear arm side, and the attached object attached to the tip of the suspension rope descends. A method for raising and lowering an attached object.

6. The method further includes, before the front arm installation step, attaching an assembly arm, on which an assembly pulley is provided, to the columnar object above the front arm, In the front arm installation step, an assembly suspension rope is wound around the assembly pulley, and one end of the assembly suspension rope is pulled up to pull up the rear arm attached to the other end of the assembly suspension rope, and then the front arm is attached to the columnar object.

6. The method for raising and lowering an attached object according to claim 5.

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