Lifting fixture, lifting method, and suspension method

Abstract

To provide a lifting fixture and a lifting method capable of safely lifting an installed article horizontally without tilting it.SOLUTION: A lifting fixture 30 for stably lifting an installed article which is detachably installed on the upper surface of a structure and in which the geometrical center of a joined surface joined to the upper surface and the intersection point of a perpendicular line passing through the gravity center of the installed article and the joined surface do not align with each other comprises: a band clamp 31 (31A, 31B) that surrounds and holds the installed article from the outside along the outer periphery of a horizontal surface crossing the installed article; a first lifting part 32 that extends in a vertical direction from the edge (31A) of the band clamp 31 (31A, 31B) and has a hook provided at the end; and a second lifting part 33 that is provided at the edge (31B) of the band clamp 31 (31A, 31B). The position of the first lifting part 32 is adjusted so that the gravity center position of the installed article can be set on a line connecting the first and second lifting parts 32 and 33 in a plan view.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a lifting jig, a lifting method, and a hanging method for stably lifting an object that is detachably installed on the upper surface of a structure. [Background technology]

[0002] In the smelting of non-ferrous metals, a slurry containing raw metal materials is placed in a cylindrical pressure vessel called an autoclave, and the valuable metals contained in the raw metal materials are leached into an aqueous solution under high temperature and pressure.

[0003] For example, in a nickel smelting plant, as described in Patent Document 1, a so-called pressure leaching process is carried out in which nickel contained in the nickel matte is leached as nickel sulfate by blowing pressurized air into a mixed slurry containing nickel matte mainly composed of finely powdered nickel sulfide and finely powdered sulfur, which is charged into an autoclave.

[0004] In the pressure leaching process, which uses an autoclave to leach valuable metals from raw metal materials under high temperature and pressure, various conditions that affect the pressure leaching reaction, such as the temperature and pressure conditions inside the autoclave, the slurry concentration of the mixed slurry, the ratio of nickel matte to sulfur contained therein, and the amount and position of high-pressure air injection, are appropriately adjusted, which makes it possible to improve the reaction efficiency of the pressure leaching reaction and increase the leaching rate of valuable metals.

[0005] Generally, ultrasonic level gauges are mainly used to measure liquid levels in factory facilities, but in the case of high-temperature liquids, accurate level measurement may not be possible because steam in the tank condenses as water droplets onto the sound wave irradiation surface of the level gauge and adheres to it. Therefore, displacer level gauges are sometimes selected to measure liquid levels in high-temperature, high-pressure autoclaves.

[0006] Displacer level gauges work on the principle of detecting the buoyancy of the displacer in the detection section as it is immersed in the liquid. In other words, if the cross-sectional area of ​​the cylindrical displacer is S, the density of the liquid is ρ, and the length from the bottom of the displacer to the liquid surface is h, then the displacer is subjected to a buoyancy force proportional to the length of time it is immersed in the liquid, as shown by ρShg (g: gravitational acceleration), and this is transmitted as an angular displacement via the lever and torque tube inside the level gauge to the level gauge's calculation section, where it is converted into liquid level. Because displacer level gauges work on this principle, the torque tube housing and calculation section are attached horizontally from the detection section (displacer), and protrude horizontally from the mounting flange by, for example, about 500 mm.

[0007] Therefore, when lifting a displacer-type level meter from the autoclave during inspection or repair, the center of gravity of the torque tube may be off, causing the meter to tilt toward the housing, which may swing and come into contact with people or equipment, potentially resulting in an accident or damage to the equipment. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-011442 Summary of the Invention [Problem to be solved by the invention]

[0009] Thus, when an object is detachably installed on the top surface of a structure, there is a need for a jig and method that can safely lift the object while keeping it horizontal when the center of gravity of the object is biased (when the geometric center of the object's joint surface with the structure does not coincide with the intersection of the perpendicular line passing through the object's center of gravity and the joint surface).

[0010] The present invention has been made to solve such a situation, and aims to provide a lifting jig, a lifting method, and a hanging method that can safely lift an installed object while keeping it horizontal without tilting it. [Means for solving the problem]

[0011] That is, one aspect of the present invention is a lifting jig for stably lifting an installation object that is detachably installed on the upper surface of a structure, where the geometric center of the joint surface that joins with the upper surface does not coincide with the intersection of the joint surface and a perpendicular line passing through the center of gravity of the installation object, and the jig is characterized by comprising a band clamp that surrounds and holds the installation object from the outside along the outer periphery of a horizontal plane that crosses the installation object, a first hanging part that extends vertically from the edge of the band clamp and has a hook at its end, and a second hanging part that is attached to the edge of the band clamp, and the position of the first hanging part is adjusted so that the center of gravity of the installation object is located on the line connecting the first hanging part and the second hanging part in a planar view.

[0012] In this case, in one aspect of the present invention, the band clamp may be a pair of split band clamps, and may include a first hanging portion extending vertically from one edge of the pair of split band clamps and having a hook at its end, and a second hanging portion provided on the other edge of the pair of split band clamps.

[0013] In one aspect of the present invention, the first suspender portion may be movable along one edge of the pair of split band clamps.

[0014] In one aspect of the present invention, a plurality of first suspending portions may be provided.

[0015] In one aspect of the present invention, the structure may be a tank that holds a liquid, the object to be installed may be a displacer-type level meter for measuring the liquid level, and the displacer-type level meter may be installed in the form of a flange connection to the lid of the tank.

[0016] Another aspect of the present invention is a lifting method using the above-mentioned lifting jig, which includes surrounding and holding the installed object from the outside with a band clamp, hanging a first hoisting device and a second hoisting device from the lifting hook of the lifting device, hooking the first hoisting hook of the first hoisting device to the first hanging part and the second hoisting hook of the second hoisting device to the second hanging part, releasing the connection between the structure and the installed object, winding up the first hoisting hook with the first hoisting device and the second hoisting hook with the second hoisting device, thereby adjusting the joint surface of the installed object so that it is horizontal, thereby performing ground clearance, and then lifting the object using the lifting device.

[0017] In this case, in another aspect of the present invention, the structure may be a tank that holds a liquid, the installed object may be a displacer-type level meter for measuring the liquid level, and the displacer-type level meter may be installed in the form of a flange connection to the lid of the tank.

[0018] Another aspect of the present invention is a lifting method using the above-mentioned lifting jig, which includes surrounding and holding the installation object from the outside with a band clamp, hanging a first hoisting device and a second hoisting device from the lifting hook of the lifting device, hooking the first hoisting hook of the first hoisting device to the first hanging part and hooking the second hoisting hook of the second hoisting device to the second hanging part, and lifting the first hoisting hook with the first hoisting device and the second hoisting hook with the second hoisting device while adjusting the joint surface of the installation object to be horizontal, and then lifting the installation object with the lifting device while adjusting the joint surface so that it is horizontal, transporting the installation object to above the joint surface with the lifting device, and hoisting the installation object with the lifting device and placing it on the joint surface.

[0019] In this case, in another aspect of the present invention, the structure may be a tank that holds a liquid, the installed object may be a displacer-type level meter for measuring the liquid level, and the displacer-type level meter may be installed in the form of a flange connection to the lid of the tank. [Effects of the Invention]

[0020] According to the present invention, an installed object can be safely lifted while being kept horizontal without tilting it. [Brief explanation of the drawings]

[0021] [Figure 1] Figure 1 is a schematic diagram showing the inside of an autoclave during the pressure leaching process. [Figure 2] FIG. 2 is a schematic diagram showing an example of a displacer type level meter. [Figure 3] FIG. 3 is a perspective view showing a lifting jig according to one embodiment of the present invention. [Figure 4] FIG. 4 is a perspective view showing a state in which a lifting jig according to one embodiment of the present invention is attached to an installed object. [Figure 5] FIG. 5 is a schematic plan view of an installation to which a lifting jig according to one embodiment of the present invention is attached, as viewed from above. [Figure 6] FIG. 6 is a process diagram showing a lifting method according to one embodiment of the present invention. [Figure 7] FIG. 7 is a process diagram showing a suspension method according to one embodiment of the present invention. [Figure 8] FIG. 8 is a schematic diagram for explaining the configuration of a device for a lifting method and a hanging method according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] Preferred embodiments of the present invention will be described in the following order with reference to the drawings. Note that the embodiments described below do not unduly limit the content of the present invention as defined in the claims, and not all of the configurations described in the embodiments are necessarily essential as means for solving the problems of the present invention. 1. Pressure leaching process for producing nickel sulfate aqueous solution 2. Lifting jig 3. Lifting and lowering methods

[0023] <1. Pressure leaching process for producing nickel sulfate aqueous solution> A lifting jig, a lifting method, and a hanging method according to one aspect of the present invention are intended to safely lift an object detachably mounted on the upper surface of a structure while maintaining it horizontal when the center of gravity of the object is offset (i.e., when the geometric center of the joint surface of the object to the structure does not coincide with the intersection of the perpendicular line passing through the center of gravity of the object and the joint surface). The structures and objects to which the present invention is applicable are not necessarily limited. As an example, consider the case of lifting a displacer level meter installed on the upper surface of an autoclave in a pressure leaching process for producing an aqueous nickel sulfate solution. In this case, the autoclave is the structure, and the displacer level meter is the installed object. The pressure leaching process for producing nickel sulfate will be briefly described below. Generally, the tank is a box-shaped container with a bottom, and the lid is often a flat plate covering the upper surface of the tank. In the present invention, the tank is a container for holding a liquid, and the lid is a somewhat broad concept referring to the upper surface of the tank. An autoclave is an integrated container with a horizontal cylindrical shape, and the part of the autoclave body that holds the liquid is the "liquid-holding tank" as defined in the present invention, and its upper surface corresponds to the "lid" as defined in the present invention.

[0024] The nickel sulfate aqueous solution manufacturing method uses nickel matte and elemental sulfur as raw materials. Nickel matte here refers to a nickel concentrate whose main components are metallic nickel and nickel sulfide, such as nickel subsulfide (Ni3S2), produced by a pyrometallurgical process, such as nickel sulfide obtained by melting nickel sulfide ore in a smelting furnace or nickel sulfide obtained by adding sulfur to nickel oxide ore and melting it in an electric furnace.

[0025] Nickel matte and sulfur are each pulverized into fine powder and mixed with water to prepare a mixed slurry having a predetermined concentration. The prepared mixed slurry is then pressure leached from the nickel matte in an autoclave through the pressure leaching reactions of the following chemical formulas 1 to 3. The pressure leaching reaction of nickel matte in this autoclave is generally carried out at a pressure of 1.6 to 1.9 MPaG and a temperature of 140 to 180°C. Ni3S2+S+6O2=3NiSO4...(chemical formula 1) Ni+S+2O2=NiSO4...(chemical formula 2) 2Ni+Ni3S2+11 / 2O2=3NiO·2NiSO4...(Chemical formula 3)

[0026] Figure 1 is a schematic diagram showing the interior of an autoclave in a pressure leaching process. The interior of autoclave 10, where the pressure leaching process is carried out, is divided into multiple compartments by overflowable weirs (partitions) 11, and each compartment is equipped with an agitator 12 with multiple stages of agitating blades and a gas outlet pipe 13 that blows compressed air toward the lowest agitating blade of the agitator 12. With this configuration, mixed slurry charged into the most upstream compartment 15A of autoclave 10 is subjected to pressure leaching treatment by blowing in high-pressure air while stirring there, and then overflows through partition 11 and is transferred to adjacent downstream compartments 15B, 15C, and 15D, where the slurry is similarly leached, and then withdrawn through withdrawal pipe 14 installed in the most downstream compartment 15E.

[0027] Therefore, since the only place in the autoclave 10 where the liquid level changes is the most downstream compartment 15E, a level gauge 20 for measuring the liquid level is installed above the most downstream compartment 15E. As mentioned above, the inside of the autoclave 10 is at high temperature and pressure, and steam is generated, so an ultrasonic level gauge cannot accurately measure the liquid level. For this reason, a displacer level gauge 20 is used to measure the liquid level in a high-temperature, high-pressure autoclave.

[0028] 2 is a schematic diagram showing an example of a displacer-type level meter 20. The displacer-type level meter 20 is detachably attached to the top surface of a structure (autoclave) 10 via a mounting flange 21 using bolts and nuts, etc. A cylindrical displacer 22 is immersed in the liquid to be measured and, as described above, is subjected to a buoyant force proportional to the length of time the displacer is immersed in the liquid. The displacer 22 is suspended from a lever inside the level meter, and the lever is attached to a torque tube inside a housing 23. Therefore, the buoyant force received by the displacer 22 is transmitted to the torque tube and converted into an angular displacement by a calculation unit 24 of the level meter, where it is converted into a liquid level.

[0029] As shown in Figure 2, the displacer-type level meter 20 has a structure in which the torque tube housing 23 and the calculation unit 24 extend horizontally, and the geometric center of the level meter's interface with the autoclave does not coincide with the intersection of the interface and a perpendicular line passing through the level meter's center of gravity. This results in an offset in the center of gravity. For this reason, when a nylon sling is wrapped around the level meter and lifted, as is typically done, the level meter will tilt toward the torque tube housing 23, where the center of gravity is offset. This will cause the level meter to swing and come into contact with people or equipment, potentially resulting in an accident or damage to the equipment. The lifting jig and lifting method of the present invention were developed to solve this problem.

[0030] <2. Lifting jig> The lifting jig according to the present invention will be described below. Fig. 3 is a perspective view showing the lifting jig according to one embodiment of the present invention, and Fig. 4 is a perspective view showing the lifting jig according to one embodiment of the present invention attached to an installed object. One aspect of the present invention is a lifting jig 30 for stably lifting an object that is detachably installed on the upper surface of a structure 10, where the geometric center of the joint surface that joins with the upper surface does not coincide with the intersection of the joint surface and a perpendicular line passing through the center of gravity of the object. The jig includes a pair of split band clamps 31 (31A, 31B) that surround and hold the object from the outside along the periphery of a horizontal plane that crosses the object, a first suspender 32 that extends vertically from one edge (31A) of the pair of split band clamps 31 (31A, 31B) and has a hook at its end, and a second suspender 33 that is attached to the other edge (31B) of the pair of split band clamps 31 (31A, 31B), and the position of the first suspender 32 is adjusted so that the center of gravity of the object is located on the line connecting the first suspender 32 and the second suspender 33 in a planar view. Naturally, when the first suspending portion 32 and the second suspending portion 33 are viewed in plan, the first suspending portion 32 and the second suspending portion 33 have a certain extent. Therefore, the line connecting the first suspending portion 32 and the second suspending portion 33 is a line connecting parts having a certain extent, and therefore refers to a band-shaped surface connecting the outermost contours of the first suspending portion 32 and the second suspending portion 33.

[0031] The split band clamp 31 surrounds and holds an object from the outside along the periphery of a horizontal plane that crosses the object. As an example, the split band clamp 31 is divided into two parts, and clamps the object. For example, as shown in FIG. 3, the flanges of a pair of split band clamps 31 (31A, 31B) can be secured with fastening bolts and nuts 34 (34A, 34B). The split band clamp 31 is preferably made of a material that is strong enough to withstand the weight of the object when it is lifted, has excellent corrosion resistance, and is easy to process, such as steel or stainless steel. The inside of the split band clamp 31 may also be provided with a cushioning material such as a rubber lining or an anti-slip coating.

[0032] The split band clamp 31 is intended to be clamped between a pair of half clamps to secure a cylindrical portion of an object to be installed, but this is not limited to this form. If the object to be installed is a polygon such as a square, a band clamp that conforms to the shape can be prepared. The band clamp itself may also be split into three or more parts, or may not be split at all (U-shaped or circular with a slit).

[0033] The first suspender 32 extends vertically from one edge 31A of the pair of split band clamps 31, and has a hook at its end. As shown in Fig. 4, the first suspender 32 extends vertically from the installation location of the split band clamp 31 while abutting against the side of the object 20, and it is preferable that the hook is provided at a position higher than the top surface of the object 20. By configuring the first suspender 32 to abut against the side of the object 20, it is possible to lift the object 20 in a more stable state.

[0034] The second suspender 33 is provided on the other edge 31B of the pair of split band clamps 31. That is, as shown in FIG. 4, the second suspender 33 is provided on the opposite side of the first suspender 32 across the installation object 20. The second suspender 33 has the role of assisting the first suspender 32 in lifting the installation object 20. Therefore, as shown in FIG. 3, for example, a hook may be provided directly on the edge of the split band clamp 31, extending horizontally outward. If it is difficult to form the second suspender 33 extending horizontally outward due to the shape of the installation object 20 or other reasons, the second suspender 33 may be formed extending vertically like the first suspender 32. Alternatively, the position of the fulcrum of the second suspender 33 may be adjusted by intentionally extending or bending the second suspender 33 horizontally outward so that the center of gravity of the installation object is located on a line connecting the first suspender 32 and the second suspender 33 in a plan view. In the present invention, it is an essential requirement that the position of the first suspending portion 32 be adjusted, but this does not mean that the position of the fulcrum of the second suspending portion 33 may also be adjusted.

[0035] FIG. 5 is a schematic plan view of an object to which a lifting jig 30 according to one embodiment of the present invention is attached, as viewed from above. As described above, when the object 20 is a displacer-type level meter, an additional device such as a calculation unit 24 is connected, so that the geometric center C of the joint surface of the object 20 relative to the structure 10 does not coincide with the intersection of the joint surface and a perpendicular line passing through the center of gravity G of the object 20. Therefore, in the lifting jig 30 according to the present invention, as shown in FIG. 5, the position of the first suspender 32 is adjusted so that the center of gravity G of the object 20 is located on a line connecting the first suspender 32 and the second suspender 33 in a plan view. In this way, the first suspender 32 and the second suspender 33 can safely lift the object 20 while keeping it horizontal and without tilting it.

[0036] In one aspect of the present invention, the first suspender 32 may be movable along one edge 31A of the pair of split band clamps 31. By doing so, even if the object 20 to be lifted changes, it becomes easy to adjust the position of the first suspender 32 so that the center of gravity G of the object 20 is located on a line connecting the first suspender 32 and the second suspender 33 in a plan view. The manner in which the first suspender 32 is movable is not particularly limited, but as one example, a clamp may be installed at one end of the first suspender 32 and attached to the edge 31A of the split band clamp 31 to make it movable, and when fixed, it may be fixed with bolts and nuts.

[0037] Alternatively, in one aspect of the present invention, a plurality of first suspenders 32 may be provided. In this way, a first suspender for A, a first suspender for B, and a first suspender for C can be installed in accordance with a plurality of known installation objects (e.g., A, B, C) with different center of gravity positions, and a single lifting jig 30 can be used to lift a plurality of installation objects (e.g., A, B, C). Furthermore, by providing a plurality of first suspenders 32 at arbitrary positions, the optimal first suspender 32 can be used even if the center of gravity of the installation object changes slightly.

[0038] <3. Lifting and hanging methods> Next, a description will be given of a lifting method using the above-described lifting jig 30 according to the present invention. Fig. 6 is a process chart showing the process of the lifting method according to one embodiment of the present invention, and Fig. 8 is a schematic diagram for explaining the device configuration for the lifting method and suspending method according to one embodiment of the present invention. One aspect of the present invention is a lifting method using the above-mentioned lifting jig 30, in which the installed object 20 is surrounded and held from the outside by the band clamp 31, the first hoisting device 42 and the second hoisting device 43 are suspended from the lifting hook 41 of the lifting device 40, the first hoisting hook 45 of the first hoisting device 42 is hooked to the first hoisting section 32, the second hoisting hook 46 of the second hoisting device 43 is hooked to the second hoisting section 33, the connection between the structure 10 and the installed object 20 is released, and the first hoisting hook 45 is reeled in by the first hoisting device 42 and the second hoisting hook 46 is reeled in by the second hoisting device 43, thereby performing ground clearance while adjusting the joint surface of the installed object 20 so that it is horizontal, and then the object is lifted by the lifting device 40. The steps are explained in order below.

[0039] First, the installation object 20 is surrounded and held from the outside by the band clamp 31 constituting the lifting jig 30 according to the present invention (step S1). The lifting jig 30 according to the present invention is as described above, and when the installation object 20 is surrounded and held from the outside, it takes on a form such as that shown in Fig. 4, for example.

[0040] Next, the first hoisting device 42 and the second hoisting device 43 are respectively suspended from the lifting hook 41 of the lifting device 40 (step S2). As an example, the lifting device 40 may be a winch such as a hoist, and the first hoisting device 42 and the second hoisting device 43 may be chain blocks. Because the second hoisting device 43 serves an auxiliary role, it may sometimes be sufficient for the second hoisting device 43 to be smaller than the first hoisting device 42. Furthermore, if the first hoisting device 42 and the second hoisting device 43 cannot be directly connected to the lifting hook 41 of the lifting device 40, a wire rope 44 may be installed on the lifting hook 41 of the lifting device 40, and the first hoisting device 42 and the second hoisting device 42 may be connected to the wire rope 44.

[0041] Next, the first hoisting hook 45 of the first hoisting device 42 is hooked to the first hoisting part 32 of the lifting jig 30 according to the present invention, and the second hoisting hook 46 of the second hoisting device 43 is hooked to the second hoisting part 33 (step S3). The hooks 45, 46 of the respective hoisting devices 42, 43 may be connected directly to the first hoisting part 32 or the second hoisting part 33, or if connection is difficult, a connector such as a shackle may be used.

[0042] Next, the connection between the structure 10 and the installed object 20 is released (step S4). For example, if the installed object 20 is a displacer-type level meter installed in the autoclave described above, the connection can be released by removing the bolts and nuts installed on the flange portion 21, which is the joint surface between the level meter and the autoclave.

[0043] Finally, the first hoisting device 42 hoists the first hoisting hook 45, and the second hoisting device 43 hoists the second hoisting hook 46, thereby adjusting the joint surface of the installed object 20 to be horizontal, and then the object is lifted up by the lifting device 40 (step S5). In the case of the displacer-type level meter described above, the object is lifted up by the first hoisting device 42 and the second hoisting device 43 (chain block), and after confirming that the level meter is horizontal and stable, the installed object 20 is lifted up by 100 mm or more, and then the installed object 20 is raised by the lifting device 40 (hoist) to a height suitable for work such as maintenance.

[0044] Next, a suspension method using the above-described suspension jig 30 according to the present invention will be described. Fig. 7 is a process diagram showing the process of the suspension method according to one embodiment of the present invention. Note that the schematic diagram shown in Fig. 8 for explaining the suspension method according to one embodiment of the present invention and the device configuration related to the suspension method can be similarly applied to the suspension method.

[0045] One aspect of the present invention is a lifting method using the above-mentioned lifting jig 30, in which the installation object 20 is surrounded and held from the outside by the band clamp 31, the first hoisting device 42 and the second hoisting device 43 are suspended from the lifting hook 41 of the lifting device 40, the first hoisting hook 45 of the first hoisting device 42 is hooked to the first hoisting section 32, the second hoisting hook 46 of the second hoisting device 43 is hooked to the second hoisting section 33, and the first hoisting hook 45 is wound up by the first hoisting device 42 and the second hoisting hook 46 is wound up by the second hoisting device 43, whereby the installation object 20 is lifted by the lifting device 40 while being adjusted so that the joint surface of the installation object 20 is horizontal, the installation object 20 is transported to above the joint surface by the lifting device 40, and the installation object 20 is suspended by the lifting device 40 and placed on the joint surface.

[0046] 7, in a lifting method according to an embodiment of the present invention, first, the installed object 20 is surrounded and held from the outside by the band clamp 31 constituting the lifting jig 30 according to the present invention (step S11), and then the first hoisting device 42 and the second hoisting device 43 are respectively suspended from the lifting hooks 41 of the lifting device 40 (step S12). After that, the first hoisting hook 45 of the first hoisting device 42 is hooked to the first hoisting part 32 of the lifting jig 30 according to the present invention, and the second hoisting hook 46 of the second hoisting device 43 is hooked to the second hoisting part 33 (step S13). These steps S11 to S13 are the same as steps S1 to S3 in the lifting method according to an embodiment of the present invention described above.

[0047] Next, the first hoisting device 42 hoists the first hoisting hook 45, and the second hoisting device 43 hoists the second hoisting hook 46, thereby adjusting the joint surface of the installed object 20 to be horizontal, and the object is then hoisted by the hoisting device 40 (step S14). In the present invention, as shown in Fig. 5, the position of the first hoisting part 32 is adjusted so that the center of gravity G of the installed object is on the line connecting the first hoisting part 32 and the second hoisting part 33 in a plan view, so the installed object can be hoisted safely while being kept horizontal without tilting.

[0048] Then, the installation object 20 is transported to above the joint surface by the lifting device 40, and the installation object 20 is suspended by the lifting device 40 and placed on the joint surface (step S15). In the case where the installation object 20 is a displacer-type level meter installed in the autoclave described above, the installation object 20 is placed on the joint surface between the level meter and the autoclave and fixed to the flange portion 21 provided on the joint surface with bolts and nuts, etc. After fixing, the first hoisting hook 45 and the second hoisting hook 46 are detached from the first hoisting part 32 and the second hoisting part 33, respectively, and the lifting jig 30 according to the present invention is removed from the installation object 20, thereby completing the hoisting operation.

[0049] As described above, by applying the lifting jig, lifting method, and hanging method according to the present invention, an installed object can be safely lifted while being kept horizontal without tilting it.

[0050] Although one embodiment of the present invention and each example have been described in detail above, it will be readily apparent to those skilled in the art that many modifications are possible without substantially departing from the novel features and effects of the present invention. Therefore, all such modifications are intended to be included within the scope of the present invention.

[0051] For example, a term that is described at least once in the specification or drawings together with a different term having a broader or equivalent meaning can be replaced with that different term anywhere in the specification or drawings. Furthermore, the configurations of the lifting jig and lifting method are not limited to those described in the embodiment and examples of the present invention, and various modifications are possible. [Explanation of symbols]

[0052] 10 Structure (autoclave), 11 Weir (partition), 12 Agitator, 13 Gas blow-off pipe, 14 Withdrawal pipe, 15A Most upstream compartment, 15B, 15C, 15D (intermediate) compartment, 15E Most downstream compartment, 20 Installed object (displatement type level meter), 21 Flange portion, 22 Displacer, 23 Housing, 24 Calculation unit, 30 Lifting jig, 31, 31A, 31B Band clamp, 32 First hoisting portion, 33 Second hoisting portion, 34, 34A, 34B Fastening bolts and nuts, 40 Lifting device, 41 Lifting hook, 42 ​​First hoisting device, 43 Second hoisting device, 44 Wire rope, 45 First hoisting hook, 46 Second hoisting hook, C Geometric center of joint surface of installed object to structure, G Center of gravity position

Claims

1. A lifting jig for stably lifting an object that is detachably installed on the upper surface of a structure, wherein the geometric center of a joint surface that is joined to the upper surface does not coincide with the intersection of a perpendicular line passing through the center of gravity of the object and the joint surface, a band clamp that surrounds and holds the installation object from the outside along the outer periphery of a horizontal plane that crosses the installation object; a first hanging portion extending vertically from an edge of the band clamp and having a hook at an end thereof; A second hanging portion provided on an edge portion of the band clamp; Equipped with The position of the first suspender is adjusted so that the center of gravity of the object is located on a line connecting the first suspender and the second suspender in a plan view. A lifting jig characterized by the above.

2. the band clamp is a pair of split band clamps, a first hanging portion extending vertically from one edge of the pair of split band clamps and having a hook at an end thereof; a second suspension portion provided on the other edge portion of the pair of split band clamps; Equipped with 2. The lifting jig according to claim 1.

3. The first hanging portion is movable along one edge of the pair of split band clamps.

3. The lifting jig according to claim 2.

4. A plurality of the first suspending portions are provided.

3. The lifting jig according to claim 2.

5. The structure is a tank that holds a liquid, the installed object is a displacer-type level meter for measuring the liquid level of the liquid, and the displacer-type level meter is installed in the form of a flange connection to the lid of the tank. The lifting jig according to any one of claims 1 to 4.

6. A lifting method using the lifting jig according to any one of claims 1 to 4, The object is surrounded and held from the outside by the band clamp, A first hoisting device and a second hoisting device are suspended from the hoisting hook of the hoisting device; a first hoisting hook of the first hoisting device is hooked onto the first hanging portion; a second hoisting hook of the second hoisting device is hooked onto the second hanging portion; The connection between the structure and the installed object is released, The first hoisting device is used to hoist up the first hoisting hook, and the second hoisting device is used to hoist up the second hoisting hook, thereby performing ground lifting while adjusting the joint surface of the installation object so that it is horizontal; Lifting is performed by the lifting device. A method for lifting an installed object, characterized by:

7. The structure is a tank that holds a liquid, the installed object is a displacer-type level meter for measuring the liquid level of the liquid, and the displacer-type level meter is installed in the form of a flange connection to the lid of the tank.

7. The method for lifting an installed object according to claim 6.

8. A lifting method using the lifting jig according to any one of claims 1 to 4, comprising: The object is surrounded and held from the outside by the band clamp, A first hoisting device and a second hoisting device are suspended from the hoisting hook of the hoisting device; a first hoisting hook of the first hoisting device is hooked onto the first hanging portion; a second hoisting hook of the second hoisting device is hooked onto the second hanging portion; The first hoisting device hoists the first hoisting hook, and the second hoisting device hoists the second hoisting hook, thereby adjusting the joint surface of the installation object so that it is horizontal, and then hoisting the installation object with the hoisting device; The object to be installed is transported onto the joint surface by the lifting device; The object is suspended by the lifting device and placed on the joint surface. A method for suspending an installation object, comprising:

9. The structure is a tank that holds a liquid, the installed object is a displacer-type level meter for measuring the liquid level of the liquid, and the displacer-type level meter is installed in the form of a flange connection to the lid of the tank.

9. The method for suspending an installed object according to claim 8.

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