Hoisting jig and construction method

Abstract

A lifting jig and a construction method are proposed that can easily carry in and out a load such as a transformer with respect to a housing. 【Solution means】A lifting jig 2 for lifting a transformer T to carry the transformer T in and out with respect to a housing 4 having a roof 4a, the lifting jig 2 including a frame body 10 having an upper side portion 11 positioned upward during lifting, a lower side portion 12 facing the upper side portion 11, and vertical side portions 13 connecting the upper side portion 11 and the lower side portion 12. The frame body 10 has an opening 14 into which the roof 4a of the housing 4 can be inserted between the upper side portion 11 and the lower side portion 12.

Description

Technical Field

[0001] The present invention relates to a suspension jig and a construction method.

Background Art

[0002] Since a transformer installed in a housing such as a cubicle is generally a heavy object, it is lifted and transported by a crane device or the like. For example, Patent Document 1 discloses a method of hanging a wire rope of a crane device on a suspension fitting provided on the upper part of a transformer and lifting and transporting the transformer.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, a transformer installed in a housing needs to be carried in and out of the housing for maintenance and repair. However, since the housing has a ceiling portion, it is difficult to carry the transformer in and out of the housing while it is lifted by a crane device, and it can only be transported up to near the entrance of the housing. For this reason, it is necessary to manually push the heavy transformer into the housing or pull it out of the housing, which requires labor.

[0005] In addition, the inside of the housing is a narrow space with limited working space. For this reason, it is difficult to work inside the housing, which takes time and effort, and there is also a problem that the workability is low, such as the possibility that a person working inside the housing may be pinched by the transformer.

[0006] An object of the present invention is to solve such problems and propose a suspension jig and a construction method capable of easily carrying a load such as a transformer in and out of a housing.

Means for Solving the Problem

[0007] The lifting jig according to the present invention is a lifting jig for lifting a load to carry the load into and out of a housing having a ceiling portion, and includes a frame body having a first arm positioned upward during lifting, a second arm facing the first arm, and a third arm connecting the first arm and the second arm. The frame body has an opening between the first arm and the second arm into which the ceiling portion of the housing can be inserted. Moreover, the first arm and the second arm are arranged substantially in parallel, and further include a mounting bracket to which a chain for closing the opening can be attached. 。

[0008] The construction method according to the present invention is a construction method for carrying a load into and out of the housing having the ceiling portion by using the above-described lifting jig, and includes a step of lifting the lifting jig with the load attached to the second arm, and a step of positioning the second arm inside the housing by inserting the opening into the ceiling portion of the housing while the lifting jig is lifted.

Advantages of the Invention

[0009] According to the lifting jig and the construction method of the present invention, a load such as a transformer can be easily carried into and out of the housing.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0011] Hereinafter, with reference to the drawings, a lifting jig of an embodiment of the present invention (hereinafter referred to as "this embodiment") and a construction method using this lifting jig will be described. In the description, the same reference numerals will be used for the same elements or elements having the same function, and redundant descriptions will be omitted.

[0012] <Lifting jig> The lifting jig of this embodiment is a lifting jig for lifting a load in order to carry the load in and out of the housing. The load is, for example, an electronic device such as a transformer, and is a heavy object having a weight of about several tens to several hundreds of kg. Hereinafter, the case where the load is a transformer will be described as an example, but the load is not limited to a transformer.

[0013] FIG. 1 is a front view of the lifting jig 2, and FIG. 2 is a side view of the lifting jig 2. FIG. 3 is a perspective view showing the housing 4. Note that the rear view of the lifting jig 2 is substantially the same as the front view, so the illustration is omitted. The lifting jig 2 shown in FIGS. 1 and 2 is a jig for carrying the transformer T in and out of the housing 4 shown in FIG. 3. As shown in FIG. 3, the housing 4 is a small storage facility for storing the transformer T, and is, for example, a cubicle. The housing 4 is installed outdoors, for example, on the rooftop of an apartment or a building. The housing 4 is not limited to one, and a plurality of them may be installed in parallel.

[0014] The housing 4 is made of metal and has a box shape, and has a roof 4a (ceiling part) at the upper part. The upper part of the housing 4 is closed by the roof 4a to protect the transformer T stored inside from the influence of the external environment and the like. Further, the housing 4 has, for example, a single-opening door 4b, and the door 4b can be opened during maintenance and repair. The transformer T stored in the housing 4 is placed on the floor surface 4c of the housing 4.

[0015] The transformer T needs to be carried in and out of the housing 4 for maintenance, repair, or replacement with a new transformer T when its performance deteriorates after long-term use. The lifting jig 2 is used for this carrying in and out. Carrying in and out includes carrying in, which means carrying the transformer T into the housing 4, and carrying out, which means carrying the existing transformer T in the housing 4 out of the housing 4. The lifting jig 2 is attached to, for example, a crane device (not shown) and is lifted and moved by operating the crane device.

[0016] As shown in FIGS. 1 and 2, the lifting jig 2 includes a frame body 10 having a substantially rectangular shape in a front view and ribs 20 erected on the frame body 10. The frame body 10 has a shape surrounded by three sides and open on one side in a front view, presenting a C-shaped or U-shaped form. The frame body 10 is composed of, for example, a square pipe made of iron steel material and has a substantially rectangular cross-section. In this specification and the like, the vertical direction indicates a substantially vertical direction. In the state where the lifting jig 2 is lifted by the crane device, the side lifted by the crane device (the upper side on the paper surface of FIGS. 1 and 2) is "up", and the side where the transformer T is attached (the lower side on the paper surface of FIGS. 1 and 2) is "down".

[0017] The frame body 10 has an upper side portion 11 (first arm), a lower side portion 12 (second arm), and a vertical side portion 13 (third arm). The upper side portion 11 is located upward during lifting, the lower side portion 12 is located downward during lifting, and faces the upper side portion 11. The upper side portion 11 and the lower side portion 12 extend substantially parallel to each other and face each other. In this specification, substantially parallel does not necessarily mean geometrically exact parallelism, but indicates that it may be parallel within the range where the required functions can be exerted. The upper side portion 11 is the side lifted by the crane device, and the lower side portion 12 is the side where the transformer T is suspended.

[0018] The vertical side portion 13 extends substantially orthogonally to the upper side portion 11 and the lower side portion 12, and connects between the upper side portion 11 and the lower side portion 12. In this specification, "substantially orthogonal" means that it does not necessarily have to be geometrically exact orthogonal, and it suffices if it is orthogonal within the range where the required functions can be exerted. The upper side portion 11 and the lower side portion 12 are separated with the vertical side portion 13 in between.

[0019] The frame body 10 has a space S surrounded by the upper side portion 11, the lower side portion 12, and the vertical side portion 13. The space S is formed by the inner peripheral surface 11a of the upper side portion 11, the inner peripheral surface 12a of the lower side portion 12, and the inner peripheral surface 13a of the vertical side portion 13. Hereinafter, the surfaces forming the space S are referred to as "inner peripheral surfaces", and the surfaces outside the inner peripheral surfaces and facing the inner peripheral surfaces are referred to as "outer peripheral surfaces". The space S is a three-sided enclosed space with one side between the upper side portion 11 and the lower side portion 12 open. That is, the frame body 10 has an opening 14 between the upper side portion 11 and the lower side portion 12. The opening 14 is a portion where the roof 4a of the housing 4 can be inserted when the frame body 10 is lifted. The width of the opening 14 in the vertical direction is formed to be larger than the width of the roof 4a in the vertical direction so that they do not collide when the roof 4a is inserted.

[0020] The cross-sectional area in the direction orthogonal to the longitudinal direction of the upper side portion 11, the lower side portion 12, and the vertical side portion 13 is substantially constant. The inner peripheral surface 11a of the upper side portion 11, the outer peripheral surface 11b of the upper side portion 11, the inner peripheral surface 12a of the lower side portion 12, and the outer peripheral surface 12b of the lower side portion 12 are each flat and arranged substantially parallel. Therefore, when inserting and removing the roof 4a into and out of the opening 14 between the upper side portion 11 and the lower side portion 12, it is possible to insert and remove it with smooth movement in the horizontal direction. A plate-shaped stopper 12h having an area larger than the cross-sectional area of the lower side portion 12 is provided at the tip 12d on the opening 14 side of the lower side portion 12.

[0021] The end portion 11c of the upper side portion 11 and the end portion 13c of the vertical side portion 13 are joined by welding or the like so as to be substantially orthogonal. Thereby, the frame body 10 has a corner portion 15 where the upper side portion 11 and the vertical side portion 13 are substantially orthogonal. Also, the end portion 12c of the lower side portion 12 and the end portion 13d of the vertical side portion 13 are joined by welding or the like so as to be substantially orthogonal. Thereby, the frame body 10 has a corner portion 16 where the lower side portion 12 and the vertical side portion 13 are substantially orthogonal.

[0022] Corner patches 17 and 18 are provided at the corner portions 15 and 16. The corner patches 17 and 18 are, for example, steel materials made of iron and function as reinforcing members for reinforcing the corner portions 15 and 16. The corner patch 17 is, for example, substantially L-shaped plate-like and is provided for each of the front surface 10e and the back surface 10f of the frame body 10. The corner patch 18 is, for example, substantially L-shaped angle-like and is provided for the inner peripheral surface 10a of the frame body 10 (between the inner peripheral surface 11a and the inner peripheral surface 13a, and between the inner peripheral surface 12a and the inner peripheral surface 13a).

[0023] The rib 20 is, for example, a plate-like member made of iron and is erected on the outer peripheral surface 10b (outer edge) of the frame body 10. The rib 20 functions as a reinforcing member for reinforcing the frame body 10. Specifically, the rib 20 has an upper rib 22 provided so as to be substantially orthogonal to the outer peripheral surface 11b of the upper side portion 11, and a vertical rib 24 provided so as to be substantially orthogonal to the outer peripheral surface 13b of the vertical side portion 13. The upper rib 22 and the vertical rib 24 are integrally formed. The rib 20 extends across the upper side portion 11 and the vertical side portion 13 and also extends to the end portion 12c of the lower side portion 12, reinforcing the entire frame body 10. The rib 20 is not provided at locations other than the end portion 12c of the lower side portion 12, and a space for easily suspending and attaching the transformer T is secured below the outer peripheral surface 12b of the lower side portion 12. Chamfered surfaces 20m for improving safety are formed at the corners of the rib 20.

[0024] The upper rib 22 is formed with a mounting hole 26 for attaching a locking tool 6 (see FIG. 4) for lifting the frame body 10. That is, the mounting hole 26 is formed on the outer peripheral surface 11b (outer edge) side of the upper side portion 11. The locking tool 6 is a member that is hooked and locked to a hook or the like of a crane device. When the locking tool 6 attached to the mounting hole 26 is locked to a hook or the like of the crane device, the frame body 10 is attached to the crane device. Thereby, the frame body 10 can be lifted by operating the crane device. A plurality of mounting holes 26 are formed at predetermined intervals, and the locking tool 6 can be selectively attached. Specifically, according to the weight, shape, size, etc. of the transformer T, the locking tool 6 can be attached by selecting the mounting hole 26 at a position where the transformer T can be lifted well in balance. The interval between the mounting holes 26 may be constant or irregular.

[0025] Further, the suspension jig 2 includes a mounting fitting 30 to which a chain 28 for closing the opening 14 can be attached. In FIG. 2, the illustration of the chain 28 and the mounting fitting 30 is omitted. The mounting fitting 30 is substantially U-shaped and is provided at the tip 22a on the opening 14 side of the upper rib 22 and the plate-shaped stopper 12h, respectively. By hooking and locking the hooks 29 provided at both ends of the chain 28 to the mounting fitting 30, the chain 28 is stretched over the opening 14. That is, the opening 14 is closed by the chain 28. The operator may tighten the chain 28 using tools such as a chain block or a chain tightening machine (not shown). By closing the opening 14 with the chain 28 in this way, even when lifting a heavy transformer T, it is possible to prevent the upper side portion 11 and the lower side portion 12 from bending so as to separate from each other, and as a result, the frame body 10 from being deformed. Also, it is possible to prevent the transformer T from falling out of the opening 14 during the lifting movement.

[0026] <Construction method> Next, with reference to FIGS. 4 and 5, a construction method for loading and unloading the transformer T with respect to the housing 4 using the above-mentioned suspension jig 2 will be described. The loading and unloading of the transformer T with respect to the housing 4 is performed with the door 4b of the housing 4 open and in a state where it is possible to enter and exit the inside of the housing 4.

[0027] As shown in FIG. 4, when loading the transformer T into the housing 4, the suspension jig 2 is lifted with the transformer T attached to the lower side portion 12 of the suspension jig 2. Specifically, the locking tool 6 attached to the suspension jig 2 is hooked onto the hook of the crane device or the like, and the suspension jig 2 is attached to the crane device. Subsequently, the transformer T is attached so as to hang below the lower side portion 12 of the suspension jig 2, and with the opening 14 closed by the chain 28, the suspension jig 2 is lifted by operating the crane device. The attachment holes 26 of the locking tool 6 are appropriately selected according to the weight of the transformer T to be loaded and the like so that the lifted transformer T is kept substantially horizontal. In the examples of FIGS. 4 and 5, the attachment holes 26 located at both ends are selected.

[0028] Subsequently, as shown in FIG. 5, with the suspension jig 2 lifted, the lower side portion 12 is positioned inside the housing 4 by inserting the opening 14 into the roof 4a of the housing 4. Specifically, the chain 28 is removed from the mounting bracket 30 to keep the opening 14 open, and by inserting the opening 14 of the suspension jig 2 into the roof 4a of the housing 4 by operating the crane device, the lower side portion 12 and the transformer T attached to the lower side portion 12 are placed in a state of being housed inside the housing 4. Then, the suspension jig 2 is lowered by operating the crane device, and the transformer T is placed on the floor surface 4c of the housing 4. Thus, the transformer T is loaded into the housing 4.

[0029] When removing the transformer T from the housing 4, the procedure is generally the reverse of that for loading. When removing, the locking tool 6 attached to the lifting jig 2 is hooked onto the hook of the crane device or the like, the lifting jig 2 is attached to the crane device, and the lifting jig 2 is lifted by operating the crane device. The mounting hole 26 of the locking tool 6 is appropriately selected according to the weight of the transformer T to be removed so that the lifted transformer T is kept substantially horizontal. The chain 28 is removed from the mounting fitting 30 and the opening 14 is left open.

[0030] Subsequently, by inserting the opening 14 of the lifted lifting jig 2 into the roof 4a of the housing 4, the lower side portion 12 is positioned inside the housing 4. Specifically, by operating the crane device to insert the opening 14 of the lifting jig 2 into the roof 4a of the housing 4, the lower side portion 12 of the lifting jig 2 is positioned inside the housing 4, and the existing transformer T in the housing 4 is made attachable to the lower side portion 12. Subsequently, the existing transformer T is attached to the lower side portion 12 of the lifting jig 2, and the opening 14 is closed with the chain 28. In this state, the lifting jig 2 is lifted by operating the crane device so that the existing transformer T floats from the floor surface 4c of the housing 4. Subsequently, the lifting jig 2 is horizontally moved by operating the crane device to a position where the roof 4a exits from the opening 14. Thus, the transformer T is removed from the housing 4.

[0031] As described above, according to the lifting jig 2 and the construction method according to the present embodiment, with the lifting jig 2 lifted using a crane device or the like, the opening 14 between the upper side portion 11 and the lower side portion 12 is inserted into the roof 4a of the housing 4, whereby the lower side portion 12 can be positioned inside the housing 4. As a result, the lower side portion 12 with the transformer T attached can be positioned inside the housing 4, and the transformer T can be easily carried into the housing 4. Further, an existing transformer T inside the housing 4 can be attached to the lower side portion 12 positioned inside the housing 4, and the transformer T can be easily carried out of the housing 4. From the above, even for the housing 4 having the roof 4a, the transformer T can be easily carried in and out. As a result, there is no need to manually push or pull the transformer T into or out of the housing 4 as in the prior art, and the labor can be significantly reduced. Further, even in a narrow space where the working space is limited, there is no risk that a person working inside the housing 4 will be pinched by the transformer T, and the work can be smoothly performed without spending time and effort.

[0032] According to the lifting jig 2 according to the present embodiment, a plurality of mounting holes 26 for selectively mounting a locking tool 6 for lifting the frame body 10 are formed at predetermined intervals on the outer peripheral surface 11b side of the upper side portion 11. Thereby, a mounting hole 26 corresponding to the weight of the transformer T or the like can be appropriately selected from among the plurality of mounting holes 26 to balance the lifting of the transformer T.

[0033] According to the lifting jig 2 according to the present embodiment, plate-like ribs 20 are erected on the outer peripheral surface 10b of the frame body 10, and the mounting holes 26 are formed in the ribs 20. Therefore, since the mounting holes 26 are provided in the plate-like ribs 20, the processing is easy, and the frame body 10 can be reinforced by the ribs 20.

[0034] As described above, an embodiment of the present invention has been explained. However, the present invention is not limited to such a specific embodiment, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims, unless otherwise particularly limited in the above description. For example, the configuration of the above embodiment can be appropriately added or deleted. Further, the effects in the above embodiment are merely examples of the effects resulting from the present invention. That is, the effects of the present invention are not limited to the above effects, and there may be additional effects other than the above effects.

[0035] For example, the suspension jig 2 shown in the above embodiment is an example, and the suspension jig of the present invention includes cases where different sizes, shapes, etc. are adopted. For example, the overall size of the suspension jig and the ratio of the lengths of each component can be appropriately changed according to the weight of the load to be carried in and out. Also, although the shape of the suspension jig 2 in a front view was described as a U-shaped or U-shaped, for example, it may be a substantially H-shaped such that the vertical side portion 13 is located in the middle portion in the longitudinal direction of the upper side portion 11 and the lower side portion 12, or it may be a substantially C-shaped with rounded corners in a front view. Further, "opposite" includes cases where they are not parallel but are inclined and facing each other, and the first arm and the second arm may be inclined. Also, the material of the suspension jig 2 is not limited to the above example, and for example, it may be subjected to rust prevention treatment by painting or the like, or may be made of stainless steel or the like.

[0036] In the above embodiment, an example in which the mounting hole 26 of the locking tool 6 is provided in the rib 20 has been described. However, the mounting hole 26 is not limited to the rib 20, and it may be provided in the upper side portion 11 itself, or a member different from the rib 20 may be provided on the upper side portion 11 and provided on the member. Also, the rib 20 does not have to be a stainless steel plate-like member, and the material, shape, etc. can be appropriately changed within the range that can function as a reinforcing member.

[0037] The device for lifting the suspension jig 2 is not limited to a crane device, and any device can be used as long as it can lift and move heavy objects such as a forklift, an electric lift, or a transformer T.

[0038] Although the roof 4a has been exemplified as the ceiling part of the housing 4, it is not limited to the roof 4a. For example, it is not limited to the one at the uppermost part like the roof 4a, and a panel ceiling or the like provided inside the housing 4 may be used as the ceiling part.

Explanation of Reference Signs

[0039] 2: Suspension jig 4: Housing 4a: Roof (ceiling part) 6: Fastener 10: Frame body 11: Upper side part (first arm) 12: Lower side part (second arm) 13: Vertical side part (third arm) 14: Opening 20: Rib 26: Mounting hole

Claims

1. A lifting jig for lifting an object to carry the object in and out of a housing having a ceiling, a frame body having a first arm that is positioned above the lifting position, a second arm that faces the first arm, and a third arm that connects the first arm and the second arm; the frame main body has an opening between the first arm and the second arm into which the ceiling portion of the housing can be inserted, The first arm and the second arm are arranged substantially parallel to each other, The hoisting jig further comprises a mounting bracket to which a chain for closing the opening can be attached.

2. The hoisting jig according to claim 1 , wherein a plurality of mounting holes are formed at predetermined intervals on an outer edge side of the first arm, into which a fastener for hoisting the frame body can be selectively attached.

3. The hoisting jig according to claim 2 , wherein a plate-shaped rib is provided on an outer edge of the frame body, and the mounting hole is formed in the rib.

4. A construction method for carrying the cargo in and out of the housing having the ceiling portion by using the hoisting jig according to any one of claims 1 to 3, hoisting the hoisting jig with the load attached to the second arm; and a step of positioning the second arm within the housing by inserting the opening of the lifted hanging jig into the ceiling of the housing.

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