Low-pressure external casing lifting device and low-pressure external casing lifting method

Abstract

Provided is an apparatus and method for more simply preventing sticking between a low-pressure outer casing and a gland packing casing, thereby shortening work time and reducing labor. [Solution] The device comprises a frame body that acts as a lifting balance extending from one axial end to the other end of the low-pressure external compartment (upper half) and that can be placed on the top of the low-pressure external compartment (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 compartment (upper half) by connecting a lifting point provided on a side wall portion at one axial end of the low-pressure external compartment (upper half) and a lifting point provided on a side wall portion at the other axial end of the low-pressure external compartment (upper half) to the lifting material fixing parts and lifting using the lifting device lifting points.

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 equipment is installed by closely contacting the vertical joint surfaces (metal surfaces) of both the gland packing casings installed at the front and rear inside the low-pressure external casing. Therefore, when the low-pressure external casing (upper half (hereinafter the same)) is hoisted using an overhead crane, there is a concern that the vertical joint surfaces of the low-pressure external casing will bite into the gland packing casing (upper half (hereinafter the same)), which is a factor that delays the installation process during regular inspections, etc.

[0003] In order to avoid the above-mentioned galling, a work process was required in which the gland packing casing was moved inward from its normal position in advance and temporarily placed there to create a gap with respect to the vertical joint surface, and then the gland packing casing was returned to its normal position after hanging the low-pressure external casing, and then tightly attached. This work was carried out inside the low-pressure external casing, in a dark and narrow environment, which led to 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 a schematic configuration of the low-pressure external casing when viewed from diagonally above, and Fig. 5 is a diagram showing a schematic configuration of the low-pressure external casing when viewed from the front. As shown in Fig. 4 and Fig. 5, a total of four lifting points 102 are provided on the side of the low-pressure external casing 101, two of which are located on each side 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 Fig. 4 and Fig. 5, 103 is a manhole and 104 is a crossover piping joint flange.

[0006] Then, as shown in Fig. 6(a), the low-pressure outer casing 101 is positioned above the gland packing casing 201. Next, as shown in Fig. 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 suspended from above while being in contact with both metal surfaces of the vertical joint surface 202. During this process, the two vertical joint surfaces 202, one at the front and one at the rear, come into contact with the metal surfaces of the low-pressure outer casing 101 at the same time, causing scuffing of either the front or rear gland packing casings 201, or both.

[0008] For this reason, the following work process has been carried out conventionally. (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 each at the front and rear, are temporarily placed toward the axial center of one low-pressure outer casing 101. This ensures in advance the axial spacing of the vertical joint surface 202 with the low-pressure outer casing 101. (3) After ensuring the axial spacing 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 correct 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 transported 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, the conditions for processes (4) and (5) were poor in terms of safety and workability.

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

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

[0011] As described above, in the conventional method, 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 to each other, 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 sticking between the low-pressure external casing and 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 the embodiment includes a frame body acting as a lifting balance, which extends from one axial end to the other end of the low-pressure external casing (upper half) and can be placed on the upper part 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. The low-pressure external casing (upper half) is lifted by connecting a lifting point provided on a side wall part at one axial end side of the low-pressure external casing (upper half) and a lifting point provided on a side wall part at the other axial end side of the low-pressure external casing (upper half) to the lifting material fixing parts and lifting using the lifting device lifting points. The contact surface of the low pressure outer casing (upper half) with the gland packing casing (upper half) is deformed outward to prevent the low pressure outer casing (upper half) and the gland packing casing (upper half) from being bitten. The present invention is characterized in that it is configured to:

[0014] The low-pressure external casing lifting method of the embodiment uses a low-pressure external casing lifting device including 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 the 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 connects a lifting point provided on a side wall part on one axial end side of the low-pressure external casing (upper half) and a lifting point provided on a side wall part on the other axial end side of the low-pressure external casing (upper half) to the lifting material fixing parts, and lifts the low-pressure external casing (upper half) using the lifting device lifting points. The contact surface of the low pressure outer casing (upper half) with the gland packing casing (upper half) is deformed outward to prevent the low pressure outer casing (upper half) and the gland packing casing (upper half) from being bitten. It is characterized by the above. Effect 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 description 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; [Diagram 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; [Diagram 3] FIG. 13 is a diagram showing the analysis results of the deformation state during hanging. [Figure 4] FIG. 1 is a perspective view for explaining a conventional method for lifting a low-pressure external casing. [Diagram 5] FIG. 11 is a front view illustrating a conventional method for lifting a low-pressure external casing. [Figure 6] FIG. 1 is a diagram for explaining a problem in a conventional method for lifting a low-pressure external casing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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, which shows a schematic configuration of a low-pressure external casing lifting device and a lifting method according to an embodiment, and Fig. 2 is a front view of Fig. 1. Note that the same reference numerals are used to designate parts corresponding to the configurations shown in Figs. 4 and 5, and duplicated explanations will be omitted. omission In addition, 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 (hereinafter the same)) when the low-pressure external casing (upper half (hereinafter the same)) of the power generation equipment is hoisted by an overhead crane during regular inspection or the like.

[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 used in the prior art shown in Figures 4 and 5. In addition, a low-pressure external casing lifting device 120 that combines a lifting scale 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, and a lateral length that is shorter than the width length of the low-pressure external casing 101. The frame body 120a has 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, Robustness The connector 10 is constructed by combining rod-shaped or pipe-shaped members made of materials having the above properties, for example, metal.

[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 disposed near the center in the longitudinal direction of the low-pressure external casing lifting device 120. The low-pressure external casing lifting device 120 can be lifted by a ceiling crane or the like by connecting wires 110 or the like to these lifting device lifting points 124. In addition, an ascent 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 disposed on both longitudinal end parts of the low-pressure external casing 120. By connecting these lifting material fixing parts 126 to the 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 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 the low-pressure external casing 101 is lifted as shown in Fig. 2, the support legs 123 and the low-pressure external casing 101 are separated from each other. In other words, the low-pressure external casing 101 can be lifted only 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 simulating the forces and deformations applied to each part of the low-pressure external casing 101 when the low-pressure external casing 101 is lifted by a conventional method (shown in the upper part of FIG. 3) and when the low-pressure external casing 101 is lifted by this embodiment (shown in the lower part of FIG. 3). In this simulation, the weight of the low-pressure external casing 101 is about several tens of tons, the length and width are about 10 meters, and the height is about several meters.

[0026] When the low-pressure outer casing 101 is lifted by the conventional method, the lower side of the low-pressure outer casing 101 is deformed so as to approach each other, as shown by the dotted line in the figure. This causes the vertical joint surface to deform so as to move axially inward, which makes it easy for the surface to bite into the gland packing casing 201. In addition, in the results of the above simulation, the deformation amount of the vertical joint surface was about 0.2 mm to 0.3 mm.

[0027] On the other hand, when the low-pressure external casing 101 is lifted according to this embodiment, the lower side of the low-pressure external casing 101 is deformed so as to move away from the low-pressure external casing 101, as shown by the dotted line in the figure. As a result, the vertical joint surface is deformed toward the axially outward side, and the gland packing casing 201 is less likely to bite into the gland packing casing 201. In addition, in the results of the above-mentioned simulation, the deformation amount of the vertical joint surface is about 2 mm to 3 mm. In this case, as described above, by connecting the low-pressure external casing 101 and the low-pressure external casing lifting device 120 with a flexible fiber sling 111 or the like, the deformation of the low-pressure external casing 101 can be prevented from being hindered.

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

[0029] Also, in order to avoid adding the work process of installing the device before use and removing it after use to the work process by 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 that 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 hoisting device 120 on the low-pressure external casing 101, it is not necessary to secure a storage space for the device within the turbine building when it is not in use. Also, the low-pressure external casing hoisting 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, so that removal of the crossover piping joint flange attached to the low-pressure external casing 101 and installation and removal of the installation work scaffolding are not difficult. Workers can ascend and descend using the ascent ladder 125, and the work platform 121 can be used as a storage location for hoisting equipment, including hoisting wires for the casing, 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 dented. (2) Avoidance of repairs to areas damaged by gnawing of the low pressure outer casing and gland packing casing. (3) Elimination of the gland packing casing temporary assembly process to prevent gnawing of the low-pressure outer casing (improving safety and work efficiency). (4) Elimination of the work of removing low-pressure external vehicle compartment crossover piping, setting up scaffolding for installation work, and dismantling.

[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 implemented 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 in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described 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 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) are connected to the lifting material fixing portion, and the low-pressure external casing (upper half) is lifted using the lifting device lifting point, thereby deforming the contact surface of the low-pressure external casing (upper half) with the gland packing casing (upper half) outward, and preventing the low-pressure external casing (upper half) and the gland packing casing (upper half) from galling. A low pressure external vehicle compartment lifting device.

2. The low pressure external compartment lifting device according to claim 1, A low-pressure external cabin 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 vehicle compartment lifting device.

4. A low-pressure external vehicle compartment lifting device according to claim 2, The work platform can be used for lifting the low-pressure external casing (upper half) and for removing and installing crossover piping. A low pressure external vehicle compartment lifting device.

5. 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 hull lifting device equipped with 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) are connected to the lifting material fixing portion, and the low-pressure external casing (upper half) is lifted using the lifting device lifting point, thereby deforming the contact surface of the low-pressure external casing (upper half) with the gland packing casing (upper half) outward, and preventing the low-pressure external casing (upper half) and the gland packing casing (upper half) from sticking to each other. A method for lifting a low-pressure external casing.

6. A method for lifting a low-pressure external compartment according to claim 5, The low pressure external casing lifting device is provided with a work floor provided on the frame body. A method for lifting a low-pressure external casing.

7. A method for lifting a low-pressure external compartment according to claim 5, 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) are connected to the lifting material fixing portion with a fiber sling. A method for lifting a low-pressure external casing.

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