Lifting device in low-pressure external compartment and lifting method in low-pressure external compartment

Abstract

To provide a device and a method capable of more simply preventing a galling between a low-pressure external compartment and a gland packing casing, and capable of reducing a working time and saving labor.SOLUTION: A lifting device in a low-pressure external compartment comprises: a frame body extending from one end to the other end in an axial direction of a low-pressure external compartment (upper half) and acting as a hanging balance capable of mounting on an upper part of the low-pressure external compartment (upper half); multiple lifting device lifting points provided on the frame body; and multiple lifting material fixing parts provided on the frame body. A lifting point provided on a side wall part in one end side in the axial direction of the low-pressure external compartment (upper half) and a lifting point provided on a side wall part in the other side in the axial direction of the low-pressure external compartment (upper half) are connected to the lifting material fixing part. It is configured to lift the low-pressure external compartment (upper half) by lifting using the lifting device lifting points.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a low-pressure outer casing lifting device and a low-pressure outer casing lifting method. [Background technology]

[0002] Generally, the low-pressure external casing of a power generation facility is installed by closely adhering both vertical joint surfaces (metal surfaces) to the gland packing casings installed at two locations inside the casing, front and rear. Therefore, when the low-pressure external casing (upper half (hereinafter the same)) is lifted using an overhead crane, there is a concern that the vertical joint surfaces of the low-pressure external casing may bite into the gland packing casing (upper half (hereinafter the same)), which is a factor that delays the installation process during periodic inspections, etc.

[0003] To avoid the above-mentioned galling, a work process was required in which the gland packing casing was moved inward from its normal position and temporarily placed there to create a gap with respect to the vertical joint surface, and then, after the low-pressure outer casing was lowered, the gland packing casing was returned to its normal position and tightly fitted.This work was carried out inside the low-pressure outer casing, in a dark and narrow environment, which posed issues such as reduced safety and work efficiency.

[0004] Hereinafter, the cause of the occurrence of galling between the vertical joint surface of the low-pressure outer casing and the gland packing casing will be described with reference to FIGS.

[0005] Fig. 4 is a diagram showing the general configuration of the low-pressure external casing when viewed obliquely from above, and Fig. 5 is a diagram showing the general configuration of the low-pressure external casing when viewed from the front. As shown in Figs. 4 and 5, the side of the low-pressure external casing 101 is provided with four lifting points 102, two on each side located near the center in the axial direction, and wires 110 or the like are connected to these lifting points 102 and lifted by an overhead crane. In Figs. 4 and 5, 103 is a manhole and 104 is a crossover piping joint flange.

[0006] Then, as shown in Figure 6(a), the low-pressure outer casing 101 is positioned above the gland packing casing 201. Next, as shown in Figure 6(b), the low-pressure outer casing 101 is lowered. At this time, if the entire low-pressure outer casing 101 is deflected due to its own weight, the axial distance between the gland packing casing 201 and the vertical joint surface 202 will be narrowed.

[0007] The low-pressure outer casing 101 is lowered from above while the vertical joint surfaces 202 are in contact with both metal surfaces. At this time, the two front and rear vertical joint surfaces 202 come into contact with the metal surfaces of the low-pressure outer casing 101 at the same time, causing the gland packing casings 201 at either the front or rear, or both, to become galled.

[0008] For this reason, the following work process has been conventionally carried out. (1) Equipment such as scaffolding, lighting, and lifting devices are installed inside the low-pressure external compartment 101 in advance. (2) The two gland packing casings 201, one at the front and one at the rear, are temporarily placed toward the axial center of one low-pressure outer casing 101. This ensures the axial distance between the vertical joint surface 202 and the low-pressure outer casing 101 in advance. (3) After ensuring the axial distance in advance, the low-pressure outer casing 101 is lowered. (4) The two front and rear gland packing casings 201 are each moved axially outward to their normal installation positions, and are brought into close contact with the lowered low-pressure outer casing 101. (5) The equipment and materials inside the installed low-pressure external casing 101 are carried out to the outside of the low-pressure external casing 101 through the manhole 103 provided in the low-pressure external casing 101. In this type of work process, processes (4) and (5) have poor conditions in terms of safety and workability.

[0009] Note that known technologies for a work platform for disassembling and assembling low-pressure external casing crossover piping include those described in, for example, Patent Document 1 and Patent Document 2. However, these technologies relate to a method for installing a work platform for installing and removing crossover piping, and do not relate to a technology for lifting a low-pressure external casing and installing it on a gland packing casing. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Publication No. 63-076152 [Patent Document 2] Japanese Patent Application Publication No. 2019-131989 Summary of the Invention [Problem to be solved by the invention]

[0011] As described above, in the past, when the low-pressure outer casing was lifted and installed on the gland packing casing, a complicated process was required to prevent the low-pressure outer casing and the gland packing casing from getting stuck together, which resulted in a problem of taking up a lot of time and effort.

[0012] The present invention has been made to solve the above-mentioned problems, and aims to provide a low-pressure external casing lifting device and a low-pressure external casing lifting method that can more easily prevent the low-pressure external casing from getting stuck to the gland packing casing, thereby shortening work time and reducing labor. [Means for solving the problem]

[0013] The low-pressure external casing lifting device of this embodiment comprises a frame body that acts as a lifting balance, extending from one axial end to the other end of the low-pressure external casing (upper half) and capable of being placed on top of the low-pressure external casing (upper half), a plurality of lifting device lifting points provided on the frame body, and a plurality of lifting material fixing parts provided on the frame body, and is configured to lift the low-pressure external casing (upper half) by connecting the lifting point provided on the side wall portion at one axial end of the low-pressure external casing (upper half) and the lifting point provided on the side wall portion at the other axial end of the low-pressure external casing (upper half) to the lifting material fixing parts and lifting using the lifting device lifting points.

[0014] The embodiment of the method for lifting a low-pressure external casing uses a low-pressure external casing lifting device that includes a frame that acts as a lifting balance and extends from one axial end to the other end of the low-pressure external casing (upper half) and can be placed on top of the low-pressure external casing (upper half), a plurality of lifting device lifting points provided on the frame, and a plurality of lifting material fixing parts provided on the frame, and is characterized in that the low-pressure external casing (upper half) is lifted by connecting a lifting point provided on a side wall portion at one axial end of the low-pressure external casing (upper half) and a lifting point provided on a side wall portion at the other axial end of the low-pressure external casing (upper half) to the lifting material fixing parts, and lifting using the lifting device lifting points. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a low-pressure external casing lifting device and a low-pressure external casing lifting method that can more easily prevent the low-pressure external casing from getting stuck to the gland packing casing, thereby shortening work time and reducing labor. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view showing a schematic configuration of a low-pressure external compartment lifting device and a lifting method according to an embodiment; [Figure 2] 1 is a front view showing a schematic configuration of a low-pressure external compartment lifting device and a lifting method according to an embodiment; [Figure 3] FIG. 10 is a diagram showing the analysis results of the deformation state during hanging. [Figure 4] FIG. 10 is a perspective view illustrating a conventional method for lifting a low-pressure outer casing. [Figure 5] FIG. 10 is a front view illustrating a conventional method for lifting a low-pressure external casing. [Figure 6] 1 is a diagram for explaining a problem in a conventional method for lifting a low-pressure external casing. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, a low-pressure external compartment lifting device and a low-pressure external compartment lifting method according to an embodiment will be described with reference to the drawings.

[0018] Fig. 1 is a perspective view seen from diagonally above, showing a schematic configuration of a low-pressure external casing lifting device and lifting method according to an embodiment, and Fig. 2 is a front view of Fig. 1. Note that parts corresponding to the configurations shown in Figs. 4 and 5 are given the same reference numerals, and duplicated explanations will be omitted. Furthermore, this embodiment is designed to prevent the vertical joint surface of the low-pressure external casing from biting into the gland packing casing (upper half (the same hereinafter)) when the low-pressure external casing (upper half (the same hereinafter)) of a power generation facility is lifted by an overhead crane during periodic inspection, etc.

[0019] As shown in Figures 1 and 2, the low-pressure external casing lifting device and lifting method of this embodiment do not use the four lifting points 102 provided on the sides of the low-pressure external casing 101 that were used in the prior art shown in Figures 4 and 5. In addition, a low-pressure external casing lifting device 120 that combines the functions of a lifting balance and a work platform is disposed above the low-pressure external casing 101.

[0020] The low-pressure external casing lifting device 120 has a longitudinal length that is approximately the same as the axial length of the low-pressure external casing 101, a lateral length that is shorter than the width length of the low-pressure external casing 101, and is equipped with a frame body 120a having a rectangular frame-like outer shape with dimensions that allow it to be placed on the low-pressure external casing 101. This frame body 120a constitutes the basic structure of the low-pressure external casing lifting device 120, and is formed by combining rod-shaped or pipe-shaped members made of sturdy materials, for example, metal or the like.

[0021] The low-pressure external casing lifting device 120 comprises a work floor 121 (not shown in FIG. 1) and handrails 122 arranged to extend upward from the periphery of the work floor 121. In addition, a plurality of support legs 123 (four in FIG. 1) are provided to protrude below the work floor 121, and these support legs 123 are used to support the low-pressure external casing 101 from above.

[0022] A plurality of (four in FIG. 1) lifting device lifting points 124 are arranged near the longitudinal center of the low-pressure external casing lifting device 120. Wires 110 or the like are connected to these lifting device lifting points 124, so that the low-pressure external casing lifting device 120 can be lifted by an overhead crane or the like. In addition, a lifting ladder 125 is provided for ascending and descending from the bottom of the low-pressure external casing 101 to the work floor 121.

[0023] Furthermore, a total of four lifting material fixing parts 126, two on each side, are arranged on both longitudinal end parts of the low-pressure external casing lifting device 120. By connecting these lifting material fixing parts 126 to lifting points 105 provided on the side walls of the axial end parts of the low-pressure external casing 101 with fiber slings 111 or the like, it becomes possible to lift the low-pressure external casing 101 together with the low-pressure external casing lifting device 120.

[0024] In this embodiment, the support legs 123 of the low-pressure external casing lifting device 120 are not fixed to the low-pressure external casing 101, and when lifting the low-pressure external casing 101, the support legs 123 and the low-pressure external casing 101 are separated as shown in Fig. 2. In other words, the low-pressure external casing 101 can only be lifted by connecting the lifting material fixing part 126 and the lifting point 105 with a fiber sling 111 or the like.

[0025] 3 shows the results of a simulation of the forces and deformations applied to each part of the low-pressure external casing 101 when the low-pressure external casing 101 is lifted using a conventional method (shown in the upper part of FIG. 3) and when the low-pressure external casing 101 is lifted using this embodiment (shown in the lower part of FIG. 3). In this simulation, the weight of the low-pressure external casing 101 is approximately several tens of tons, the length and width are approximately 10 meters, and the height is approximately several meters.

[0026] When the low-pressure outer casing 101 is lifted using the conventional method, the lower side of the low-pressure outer casing 101 deforms so that it approaches the lower side, as shown by the dotted line in the figure. This causes the vertical joint surface to deform so that it moves axially inward, making it more likely to become stuck with the gland packing casing 201. The results of the above simulation showed that the deformation of the vertical joint surface was approximately 0.2 mm to 0.3 mm.

[0027] On the other hand, when the low-pressure outer casing 101 is lifted according to this embodiment, the lower side of the low-pressure outer casing 101 deforms so as to separate, as shown by the dotted line in the figure. As a result, the vertical joint surface deforms axially outward, making it less likely for the gland packing casing 201 to become stuck. In addition, the results of the above-mentioned simulation showed that the deformation of the vertical joint surface was approximately 2 mm to 3 mm. In this case, as described above, by connecting the low-pressure outer casing 101 and the low-pressure outer casing lifting device 120 with a flexible fiber sling 111 or the like, it is possible to prevent the deformation of the low-pressure outer casing 101 from being hindered.

[0028] Therefore, in this embodiment, it is possible to prevent the gland packing casing 201 from getting stuck without performing the above-described steps (1) to (5) in the conventional method.

[0029] Furthermore, in order to avoid adding the work process of installing the device before use and removing it after use to the work process when using the low-pressure external casing lifting device 120, the low-pressure external casing lifting device 120 can be permanently installed above the low-pressure external casing 101. In this case, it is supported above the low-pressure external casing 101 by multiple support legs 123 (four in FIG. 1).

[0030] In this way, by permanently installing the low-pressure external casing lifting device 120 on the low-pressure external casing 101, there is no need to secure a storage space within the turbine building for the device when not in use. Also, to facilitate the removal of the crossover piping joint flange attached to the low-pressure external casing 101 and the installation and removal of the installation work scaffolding, the low-pressure external casing lifting device 120 is structured so that it can be used as a work platform for disassembling and assembling the crossover piping and for rigging work on the low-pressure external casing 101 itself. Workers can ascend and descend using the climbing ladder 125, and the work platform 121 can be used as a storage location for lifting equipment, including casing lifting wires, chain blocks, etc.

[0031] As described above, according to this embodiment, the following effects can be obtained. (1) Avoidance of work delays due to the low-pressure outer casing and gland packing casing being galled. (2) Avoidance of repairs to areas damaged by gnawing on the low-pressure outer casing and gland packing casing. (3) Elimination of the gland packing casing temporary assembly process to prevent the low-pressure outer casing from being bitten (improving safety and work efficiency). (4) Elimination of the removal of low-pressure external compartment crossover piping, installation of scaffolding for installation work, and dismantling work.

[0032] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0033] 101...Low-pressure external casing (upper half), 102...Lifting point, 103...Manhole, 104...Crossover piping joint flange, 110...Wire, 111...Fiber sling, 120...Low-pressure external casing lifting device, 120a...Frame, 121...Work floor, 122...Handrail, 123...Support leg, 124...Lifting device lifting point, 125...Lifting ladder, 126...Lifting material fixing part, 201...Gland packing casing (upper half), 202...Vertical joint surface.

Claims

1. a frame that acts as a suspension balance and extends from one axial end to the other axial end of the low-pressure external casing (upper half) and can be placed on an upper portion of the low-pressure external casing (upper half); A plurality of lifting device lifting points provided on the frame; A plurality of lifting material fixing portions provided on the frame body; Equipped with The low-pressure external casing (upper half) is configured to be lifted by connecting a lifting point provided on a side wall portion at one axial end side of the low-pressure external casing (upper half) and a lifting point provided on a side wall portion at the other axial end side of the low-pressure external casing (upper half) to the lifting material fixing portion and lifting using the lifting device lifting point. A low-pressure external compartment lifting device.

2. The low-pressure external compartment lifting device according to claim 1, A low-pressure external compartment lifting device characterized by having a working platform provided on the frame body.

3. The low-pressure external compartment lifting device according to claim 1, The frame body is supported by support legs on the low-pressure outer casing (upper half), and the support legs are not fixed to the low-pressure outer casing (upper half). A low-pressure external compartment lifting device.

4. The low-pressure external compartment lifting device according to claim 1, The work platform can be used for slinging work when lifting the low-pressure outer casing (upper half), and for removing and installing crossover piping. A low-pressure external compartment lifting device.

5. The low-pressure external compartment lifting device according to claim 1, When the low-pressure outer casing (upper half) is lifted, the contact surface of the low-pressure outer casing (upper half) with the gland packing casing (upper half) is deformed outward, thereby preventing the low-pressure outer casing (upper half) and the gland packing casing (upper half) from sticking together. A low-pressure external compartment lifting device.

6. a frame that acts as a suspension balance and extends from one axial end to the other axial end of the low-pressure external casing (upper half) and can be placed on an upper portion of the low-pressure external casing (upper half); A plurality of lifting device lifting points provided on the frame; A plurality of lifting material fixing portions provided on the frame body; A low-pressure external casing lifting device equipped with The lifting point provided on the side wall portion at one axial end side of the low-pressure external casing (upper half) and the lifting point provided on the side wall portion at the other axial end side of the low-pressure external casing (upper half) are connected to the lifting material fixing portion, and the low-pressure external casing (upper half) is lifted by using the lifting device lifting point. A method for lifting a low-pressure external casing.

7. 7. The method for lifting a low-pressure outer casing according to claim 6, The low-pressure external casing lifting device is provided with a work platform provided on the frame body. A method for lifting a low-pressure external casing.

8. 7. The method for lifting a low-pressure outer casing according to claim 6, A lifting point provided on a side wall portion on one axial end side of the low-pressure external casing (upper half) and a lifting point provided on a side wall portion on the other axial end side of the low-pressure external casing (upper half) are connected to the lifting material fixing portion with a fiber sling. A method for lifting a low-pressure external casing.

9. 7. The method for lifting a low-pressure outer casing according to claim 6, When the low-pressure outer casing (upper half) is lifted, the contact surface of the low-pressure outer casing (upper half) with the gland packing casing (upper half) is deformed outward, thereby preventing the low-pressure outer casing (upper half) and the gland packing casing (upper half) from sticking together. A method for lifting a low-pressure external casing.

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