JP7129357B2 - METHOD FOR VERTICAL INVERSION OF CASING HALF, ROTATING SHAFT BRACKET AND INVERSION BASE USED FOR THE METHOD - Google Patents

Description

An embodiment of the present invention relates to a method for turning a vehicle interior half upside down, a rotating shaft bracket and a turning frame used for the method.

A steam turbine is an external combustion engine in which a steam flow accelerated by a nozzle (stationary blade) flows into moving blades, and the energy of the steam is converted into rotational energy of a turbine rotor by the moving blades. A steam turbine houses a nozzle and rotor blades in a container called a casing. The casing generally consists of an inner casing that houses a nozzle, moving blades, and a turbine rotor that holds the moving blades, and an outer casing that is provided outside the inner casing and contains the inner casing. . In addition, the inner compartment and the outer compartment are generally divided vertically into an upper half of the compartment and a lower half of the compartment. The upper half of the passenger compartment and the lower half of the passenger compartment are generally connected by fastening with bolts while the joint surfaces provided on the peripheral edge portions of the upper half of the passenger compartment and the lower half of the passenger compartment are abutted against each other. .

Power plants are required to perform periodic inspections, and such periodic inspections also include inspections of steam turbines. At this time, along with the inspection of the steam turbine, there are cases where repair work, etc., is performed on each part of the steam turbine. For example, in addition to the non-destructive inspection of the inner and outer surfaces of the passenger compartment, there are cases where the inner and outer surfaces are repaired, or the joint surfaces of the upper and lower halves of the passenger compartment are corrected. The joint surface is a portion that is likely to be deformed by the heat of the steam during operation of the steam turbine, and it is likely that correction processing or the like is required.

When performing repair work as described above, the upper half of the passenger compartment is usually turned upside down so that the joint surface of the upper half of the passenger compartment, which faces downward in the installed state, faces upward. In this case, an overhead crane installed in the turbine building of the power plant may be used to turn the upper half of the casing upside down.

If the overhead crane installed in the turbine building of the power plant has a main hoist and an auxiliary hoist, and the auxiliary hoist capacity is more than half of the weight of the casing half, the main hoist and the auxiliary hoist are used together. Vertical inversion is possible by four-point suspension. However, if the auxiliary hoisting capacity is less than half of the weight of the half casing, or if the overhead crane does not have auxiliary hoisting, it cannot be turned upside down by four-point suspension. In this case, it is necessary to perform upside-down reversal by two-point suspension only by the overhead crane main hoist.

Both the four-point suspension and the two-point suspension are technically difficult and dangerous operations. In particular, two-point hoisting is technically more difficult than four-point hoisting, so the work must be done by a crane operator or a slinging signal person who has an experienced special skill. However, in recent years, such skilled workers are on the decline and becoming scarce.

In addition, during periodic inspections, overhead cranes may be used for disassembling and repairing parts other than steam turbines, such as generators, and the overhead cranes are used more frequently. Therefore, a situation may arise in which it is difficult to use the overhead crane in preference to turning the upper half of the passenger compartment upside down. In addition, it is naturally required to shorten the usage time of the overhead crane in the upside-down operation of the upper half of the passenger compartment.

Hereinafter, the upside-down method for reversing the passenger compartment by general four-point suspension and two-point suspension will be described with reference to FIGS. 22 and 23. FIG. In FIG.22 and FIG.23, the code|symbol 1 has shown the vehicle interior upper half. A pair of cabin trunnions 2a, 2b are provided on one of the two side portions of the upper cabin half 1, and a pair of cabin trunnions 2c, 2d are provided on the other. The casing trunnions 2a and 2c are provided on one side in the turbine axial direction, and the casing trunnions 2b and 2d are provided on the other side in the turbine axial direction. Note that the casing trunnions 2c and 2d are located on the far side of the paper surface of FIGS. 22 and 23, so they do not appear in the drawings, but their installation positions are indicated by dashed lead lines for convenience of explanation. there is 22 shows the overhead crane 100 having the main hoisting hook 101 and the auxiliary hoisting hook 102, and FIG. 23 shows the overhead crane 110 having one hook 111 without the auxiliary hoisting hook. ing.

First, vertical reversal by four-point suspension will be described. Referring to FIG. 22A, a wire 300a is hung on the casing trunnion 2a and the main winding hook 101, and a wire 300c is hung on the casing trunnion 2c and the main winding hook 101. . Further, the wire 300b is hung on the casing trunnion 2b and the auxiliary winding hook 102, and the wire 300d is hung on the casing trunnion 2d and the auxiliary winding hook 102. After that, the main hoisting hook 101 and the auxiliary hoisting hook 102 are hoisted at the same time to hoist the upper half 1 of the passenger compartment.

Next, as shown in FIG. 22B, the auxiliary winding hook 102 is suspended from the main winding hook 101, and as shown in FIG. Rotate the upper half of the passenger compartment 1 until

Next, as shown in FIG. 22(D), the wires 300b, 300d hooked on the auxiliary winding hooks 102 are removed from the compartment trunnions 2b, 2d. Then, the casing upper half 1 suspended from the main winding hook 101 is rotated around the vertical axis, and as shown in FIG. 22(E), is inverted around the vertical axis. At this time, the wires 300b, 300d are held at predetermined positions so that the wires 300b, 300d hooked on the auxiliary winding hook 102 do not interfere with the upper half 1 of the passenger compartment.

Next, the wires 300b and 300d that were removed in FIG. 22(D) are hooked again to the cabin trunnions 2b and 2d. Then, as shown in FIG. 22(F), the auxiliary winding hook 102 is hoisted up to a position where the joint surface of the upper compartment 1 is aligned in the horizontal direction, whereby the upper compartment 1 is turned upside down.

Next, upside-down inversion of the passenger compartment by two-point suspension will be described. First, as shown in FIG. 23A, the wire 300a is hooked on the cabin trunnion 2a and the hook 111, and the wire 300c is hooked on the cabin trunnion 2c and hook 111. As shown in FIG.

Next, as shown in FIG. 23(B), the hook 111 is hoisted up to lift one side of the upper compartment 1 . At this time, as indicated by an arrow C, the hook 111 is moved laterally toward the floor contact position of the upper half 1 of the passenger compartment. Then, as shown in FIG. 23(C), the upper chamber half 1 is rotated to a position where the joint surface of the upper chamber half 1 is along the vertical direction.

Next, the upper compartment 1 suspended by the hook 111 is rotated about the vertical axis and turned over about the vertical axis as shown in FIG. 23(C).

Next, as shown in FIG. 23(D), the upper half of the passenger compartment 1 is temporarily placed on the reversing frame 400A. At this time, the ends of the upper half 1 of the passenger compartment on the side of the passenger compartment trunnions 2b and 2d are brought into contact with the upper surface of the reversing base 400A from above. Subsequently, as indicated by arrow D in FIG. 23(E), the hook 111 is lowered while moving sideways away from the reversing stand 400A, and the end of the upper compartment 1 in contact with the reversing stand 400A is the fulcrum. , the upper half of the passenger compartment 1 is tilted. Then, the hook 111 is operated until the joint surface of the upper compartment 1 is aligned in the horizontal direction, whereby the upper compartment 1 is turned upside down. At this time, the ends of the upper half 1 of the passenger compartment on the side of the passenger compartment trunnions 2a and 2c are placed on a reversing stand 400B different from the reversing stand 400A.

As described above, 4-point hoisting and 2-point hoisting work require special skills, and it is necessary to invite a crane operator and a slinging signal person who are skilled and have special skills to carry out the work. In consideration of these points, various techniques have been proposed so far for the purpose of easily and efficiently performing upside-down reversal and disassembly of the passenger compartment.

JP-A-10-317912 JP 2014-177888 A JP 2017-125411 A

The problem to be solved by the present invention is to provide a method for turning up and down a half of a passenger compartment, which can easily turn the half of the passenger compartment upside down at low cost while suppressing the usage time of the overhead crane as much as possible, and It is an object of the present invention to provide a rotating shaft bracket and a reversing stand for use.

A method for inverting a casing half according to an embodiment is a method for vertically inverting a casing half of a steam turbine, wherein a rotating shaft bracket having a rotating shaft is mounted on a turbine shaft. and the rotating shaft on one side and the rotating shaft on the other side are coaxial and parallel to the axial direction of the turbine. and a step of turning the rotating shaft around its central axis to turn the casing half upside down.

Further, a rotating shaft bracket according to one embodiment is a rotating shaft bracket attached to a half casing of a steam turbine in order to turn the casing half upside down, and supports a rotating shaft and the rotating shaft. and a bracket body attached to the vehicle compartment half. The rotary shaft bracket is configured such that the rotary shaft is parallel to the turbine axial direction when the bracket main body is attached to the casing half. The rotary shaft bracket is configured to rotate the rotary shaft around the central axis of the rotary shaft, thereby rotating the passenger compartment half.

In addition, the reversing frame according to one embodiment is attached to the half casing of the steam turbine in order to turn the half casing of the steam turbine upside down. It is a reversing stand that supports the The reversing frame has a support surface on the upper part for rotatably supporting the rotating shaft, and the other end of the traction wire connected to the outer peripheral surface of the rotating shaft supported by the supporting surface is attached to the other end of the chain. A tool holding section is provided on the side for holding the chain drive section of the chain puller connected at one end. The reversing cradle is configured to rotate the rotary shaft on the support surface when one end of the chain moves toward the chain drive held by the tool holder.

ADVANTAGE OF THE INVENTION According to this invention, while suppressing the usage time of an overhead crane as much as possible, it is low-cost and can implement the upside-down reversal of a compartment half easily.

FIG. 10 is a diagram showing a state in which the upper half of the passenger compartment, which is turned upside down by the method for turning upside down a half of the passenger compartment, is supported by a reversing frame via a rotating shaft bracket; It is the figure which looked at the vehicle upper half in the direction of arrow II of FIG. FIG. 2 is a side view of the upper half of the compartment shown in FIG. 1; FIG. 2 is a plan view of the upper half of the compartment shown in FIG. 1; 2 is a front view of the rotary shaft bracket shown in FIG. 1; FIG. 2 is a side view of the rotary shaft bracket shown in FIG. 1; FIG. FIG. 2 is a plan view of the rotary shaft bracket shown in FIG. 1; FIG. 10 is a diagram for explaining a method for turning the casing half upside down according to the embodiment, and is a diagram showing a state in which the casing upper half is installed on the setup cradle. FIG. 8 is a view of the upper half of the passenger compartment viewed in the direction of arrow VII in FIG. 7 ; It is a figure explaining the operation|work which attaches a rotating shaft bracket to the vehicle upper half installed in the receiving stand for setup. It is a figure explaining the operation|work which lifts the vehicle upper half to which the rotating shaft bracket was attached. FIG. 11 is a view for explaining the operation of placing the upper half of the compartment lifted from the state shown in FIG. 10 on the reversing stand. It is a figure explaining the operation|work which provides a chain pulling tool between the rotating shaft bracket and the base for reversing which were attached to the vehicle upper half. FIG. 13 is a diagram of the upper half of the passenger compartment viewed in the direction of arrow XIII shown in FIG. 12 ; FIG. 13 is a view for explaining the operation of rotating the upper half of the passenger compartment on the reversing stand by the chain pulling tool shown in FIG. 12 ; FIG. 13 is a view for explaining the operation of rotating the upper half of the passenger compartment on the reversing stand by the chain pulling tool shown in FIG. 12 ; FIG. 13 is a view for explaining the operation of rotating the upper half of the passenger compartment on the reversing stand by the chain pulling tool shown in FIG. 12 ; FIG. 13 is a view for explaining the operation of rotating the upper half of the passenger compartment on the reversing stand by the chain pulling tool shown in FIG. 12 ; FIG. 8 is a diagram showing a state in which the upper half of the passenger compartment, which has been turned upside down from the state shown in FIG. 7 , is supported by the turnover base. It is a figure explaining the operation|work which lifts the compartment upper half shown in FIG. FIG. 19 is a view for explaining the operation of placing the upper half of the passenger compartment lifted from the state shown in FIG. 18 again on the setup receiving table; It is a figure which shows the state which removed the rotation shaft bracket from the vehicle interior upper half shown in FIG. It is a figure explaining the up-down reversal method of the passenger compartment by general four-point suspension. It is a figure explaining the up-down reversal method of the vehicle interior by general two-point suspension.

An embodiment will now be described in detail with reference to the accompanying drawings. 21 and 22 are denoted by the same reference numerals.

FIG. 1 shows an upper half casing 1 that is turned upside down by a method for turning upside down casing halves for a steam turbine according to an embodiment, and is supported by turnover bases 40A and 40B via rotating shaft brackets 20A and 20B. It shows a state where the FIG. 2 is a view of the upper compartment 1 supported by the reversing mounts 40A and 40B as viewed in the direction of arrow II in FIG.

In the method for inverting the casing half upside down according to the present embodiment, the casing upper half 1 is rotated in the direction of the arrow in FIG. is flipped upside down. Details of the upper half of the passenger compartment 1, the rotating shaft brackets 20A and 20B and the reversing mounts 40A and 40B used for reversing the same, and the method for reversing the upper half will be described below.

(upper half of vehicle)
First, referring to FIGS. 3A and 3B, the upper half 1 of the passenger compartment to be turned upside down will be described. The upper half of the casing 1 is paired with the lower half of the casing (not shown) and accommodates a nozzle (stationary blade) and moving blades. Generally, a steam turbine has an inner casing and an outer casing outside the inner casing. The upper compartment 1 described here corresponds to the upper compartment of the outer compartment.

2 and 8, etc., the casing upper half 1 has a semi-cylindrical upper half main body 1A that accommodates a nozzle and rotor blades. When the upper half body 1A accommodates the nozzle and the moving blades, the rotor shaft of the turbine rotor supporting the moving blades passes through the axial end of the upper half body 1A along the axial direction of the upper half body 1A. That is, when the upper half main body 1A accommodates the nozzle and rotor blades, the axial direction of the upper half main body 1A is the same direction as the turbine axial direction TD. Therefore, hereinafter, when describing the orientation and each part of the upper half of the casing 1, the term "turbine axial direction TD" may be used for convenience of description. The turbine axial direction TD is indicated by an arrow in FIGS. 1, 3A and 3B.

The upper half casing 1 has flange portions 1B projecting from both sides of an upper half main body 1A extending along the turbine axial direction TD so as to face each other in a direction orthogonal to the turbine axial direction TD in plan view. is doing. The illustrated flange portion 1B includes a pair of portions extending along the turbine axial direction TD, and portions extending from both end portions of these portions so as to wrap around toward the axial end portions of the upper half main body 1A. . The lower surface of the flange portion 1B forms a joint surface 4, and the joint surface 4 is provided with a plurality of bolt holes 6 penetrating to the opposite surface. The upper half of the casing 1 and the lower half of the casing have a joint surface 4 that abuts against the joint surface of the lower half of the casing (not shown). They are integrated with each other by tightening bolts that are inserted across the bolt holes.

Casing trunnions 2a and 2b are provided on side surfaces of the flange portion 1B facing one side in a direction perpendicular to the turbine axial direction TD in plan view, and flanges facing the other side in a direction perpendicular to the turbine axial direction TD. Casing trunnions 2c and 2d are provided on the side surface of the portion 1B. The casing trunnion 2a and the casing trunnion 2c face each other in a direction orthogonal to the turbine axial direction TD, and are positioned on one side (the left side in FIGS. 3A and 3B) in the turbine axial direction TD. The casing trunnion 2b and the casing trunnion 2d face each other in a direction orthogonal to the turbine axial direction TD, and are positioned on the other side (the right side in FIGS. 3A and 3B) in the turbine axial direction TD. The cabin trunnions 2a to 2d are adapted to be hung with wires, and are configured as hanging points for lifting the upper half of the cabin 1 by a crane.

In addition, a steam inlet pipe connecting portion 8 is provided in the upper portion of the upper half main body 1A. A steam inlet pipe (not shown) for supplying steam from a boiler (not shown) is connected to the steam inlet pipe connecting portion 8 . A crossover pipe connection portion 9 is provided on the upper portion of the upper half main body 1A. A crossover pipe (not shown) is connected to the crossover pipe connecting portion 9 to supply steam from the upper half of the casing 1 to another steam turbine (low-pressure turbine).

(Rotating shaft bracket)
Next, the rotating shaft brackets 20A and 20B will be described with reference to FIGS. 4 to 6. FIG. The rotating shaft bracket 20A is attached to the upper compartment 1 on one side in the turbine axial direction TD, and the rotating shaft bracket 20B is attached to the upper compartment 1 on the other side in the turbine axial direction TD. Since the rotating shaft brackets 20A and 20B have basically the same configuration except that the mounting positions are different, only the rotating shaft bracket 20A attached to one side of the upper half 1 of the passenger compartment will be described below. Description of the shaft bracket 20B is omitted.

As shown in FIGS. 4 to 6, the rotary shaft bracket 20A includes a rotary shaft 21 and a bracket body 22 that supports the rotary shaft 21 and is attached to the upper half 1 of the passenger compartment. As shown in FIGS. 1 and 2, when the bracket body 22 is attached to the vehicle upper half 1, the rotating shaft 21 is supported by the bracket body 22 so as to be parallel to the turbine axial direction TD. As will be described later, the rotating shaft bracket 20A rotates the upper compartment 1 by rotating the rotating shaft 21 about its central axis. That is, the rotary shaft 21 functions as a central axis of rotation when the upper half 1 of the passenger compartment is turned upside down.

The bracket body 22 has a flat plate-like base plate 23 fixed to the joint surface 4 of the upper half of the vehicle compartment 1, and a pair of mounting plates 24 rising from the base plate 23. A rotating shaft 21 is supported. As shown in FIG. 6 , the base plate 23 is provided with a plurality of base plate bolt holes 23</b>A that are superimposed on the plurality of bolt holes 6 provided in the joint surface 4 of the upper half 1 of the passenger compartment. .

As shown in FIG. 1, the base plate 23 is abutted against the joint surface 4, and in this state, bracket fastening bolts 23B are inserted into the plurality of bolt holes 6 and the plurality of base plate bolt holes 23A that overlap each other. is fastened to a nut 23C arranged on the upper surface of the flange portion 1B. As a result, the base plate 23 is attached to the upper half 1 of the passenger compartment. When the bed plate 23 is fixed to the joint surface 4 in this way, the rotating shaft 21 protrudes from the upper half of the casing 1 in the turbine axial direction TD, and as shown in FIG. It is positioned inside the upper half 1 of the passenger compartment.

The rotary shaft 21 is supported by support bolts 24A passing through each of the pair of mounting plates 24, and a portion of the rotary shaft 21 located between the pair of mounting plates 24 is screwed with the support bolt 24A. A portion 21A (see FIGS. 4 and 6) is provided. Further, in this example, the rotating shaft 21 is supported by the bracket body 22 so that the relative position thereof can be adjusted. Specifically, as shown in FIG. 5, the pair of mounting plates 24 are provided with a plurality of bolt holes 24B into which support bolts 24A can be inserted. By selecting a bolt hole and inserting the support bolt 24A, the height position of the rotary shaft 21 can be adjusted.

If the relative position of the rotary shaft 21 to the bracket main body 22 is adjustable, the position of the rotary shaft 21 when the rotary shaft bracket 20A is attached to the upper half 1 of the passenger compartment can be adjusted to a desired position. At this time, for example, when the position of the rotating shaft 21 is adjusted so that the rotating shaft 21 overlaps the center of gravity of the upper half of the casing 1 when viewed in the turbine axial direction TD, especially so that it is coaxial with the center of gravity of the casing, The upper half 1 can be stably inverted upside down.

A pair of connecting portions 25 are provided on the outer peripheral surface of the rotating shaft 21 to which one end of the traction wire 32 (see FIGS. 1 and 2) can be connected. As will be described later, a pulling wire 32 is connected to the rotating shaft 21 via a connecting portion 25, and the rotating shaft 21 is rotated by pulling the pulling wire 32. As shown in FIG. The connecting portion 25 is not particularly limited as long as it can connect the traction wire 32 , but the connecting portion 25 in this example is an annular ring that can swing about a rotation axis extending in the axial direction of the rotation shaft 21 . Consists of metal fittings. Two connecting portions 25 are provided on the outer peripheral surface of the rotating shaft 21 . One of the two connecting portions 25 is provided on the upper surface of the rotating shaft 21 and the other is provided on the lower surface of the rotating shaft 21 . The two connecting portions 25 in this example are provided so as to face each other across the central axis of the rotating shaft 21 .

6, two eyebolt mounting screw holes 26 are provided on the upper surface of the rotating shaft 21 so as to sandwich the connecting portion 25 therebetween. When an eyebolt is provided in the eyebolt mounting screw hole 26, for example, by hooking a wire to the eyebolt, the rotation shaft bracket 20A can be lifted and transported.

(Reversing stand)
Next, the reversing mounts 40A and 40B will be described with reference to FIGS. 1 and 2. FIG. The reversing base 40A supports the rotating shaft 21 of the rotating shaft bracket 20A attached to the casing upper half 1 on one side in the turbine axial direction TD, and the reversing base 40B supports the vehicle on the other side in the turbine axial direction TD. A rotating shaft bracket 20B attached to the upper chamber half 1 supports the rotating shaft 21 . The reversing pedestals 40A and 40B have basically the same configuration except that the arrangement is different.

As shown in FIGS. 1 and 2, the reversing bases 40A and 40B have a support surface 41 for supporting the rotating shaft 21 on the upper part, and tool holding parts for holding the chain driving part 51 of the chain pulling tool 50 on both sides. A portion 42 is provided. The support surface 41 is an arcuate surface that opens upward, contacts the outer peripheral surface of the rotating shaft 21, and supports the rotating shaft 21 in a state in which the rotating shaft 21 can rotate about the central axis. In this embodiment, one end of the chain 52 of the chain pulling tool 50 is attached to the other end of the pulling wire 32, one end of which is coupled to the outer peripheral surface of the rotating shaft 21 supported by the support surface 41 via the above-described coupling portion 25. are connected, and the rotating shaft 21 is rotated by pulling the chain 52 .

The chain pulling tool 50 pulls a chain 52 by means of a chain driving portion 51. The chain driving portion 51 has a manual lever, and pulls or extends the chain 52 by operating the lever (a so-called lever block (registered trademark)), or the chain 52 may be pulled or drawn out by an electric motor. The tool holding portion 42 is provided to hold the chain driving portion 51 of the chain traction device 50 on the reversing mounts 40A and 40B, and one end of the chain 52 is held by the tool holding portion 42. The rotary shaft 21 can be rotated on the support surface 41 when moved towards the chain drive 51 .

As shown in FIG. 2, wire sliding covers 43 are attached to the upper corners of the reversing bases 40A and 40B located between the support surfaces 41 and the tool holding portions 42, respectively. The wire sliding cover 43 has an arcuate surface, and is preferably made of a plastic material or the like that is relatively flexible and has low frictional resistance. When the traction wire 32 and the chain traction tool 50 are interposed between the outer peripheral surface of the rotating shaft 21 and the tool holding portion 42 as described above, the wire sliding cover 43 may come into contact with the traction wire 32. Thus, it is possible to smoothly pull with the chain pulling tool 50. - 特許庁

(vertical inversion method)
Next, the vertical reversing method according to the present embodiment using the rotating shaft brackets 20A and 20B and the reversing mounts 40A and 40B described above will be described in detail with reference to FIGS. 7 to 20. FIG.

7 and 8 show the state in which the upper half 1 of the passenger compartment is installed on the setup cradles 60A and 60B. In the present embodiment, first, the upper half of the passenger compartment 1 is placed on the two setup cradles 60A and 60B. The upper half of the passenger compartment 1 is supported by two setup pedestals 60A and 60B with the joint surface 4 directed downward. One setup pedestal 60A of the two setup pedestals 60A and 60B supports one side portion of the upper half casing 1 in the direction orthogonal to the turbine axial direction TD as shown in FIG. , the other setup support 60A supports the other side portion of the upper half of the casing 1 in the direction orthogonal to the turbine axial direction TD.

The two setup pedestals 60A and 60B support the central portion of the upper half casing 1 in the turbine axial direction TD. Overhang in direction TD. In this embodiment, when the upper casing half 1 is placed on the two setup cradles 60A and 60B, the upper casing half 1 is lifted by the overhead crane via the casing trunnions 2a to 2d. are omitted.

Next, the rotating shaft brackets 20A and 20B are attached to the upper half 1 of the passenger compartment as shown in FIG. The rotating shaft bracket 20A is arranged on one side of the upper casing half 1 in the turbine axial direction TD and then attached to the upper casing half 1. The rotating shaft bracket 20B is attached to the upper casing half 1 in the turbine axial direction TD. is installed on the other side of the vehicle compartment upper half 1 . At this time, an eyebolt (not shown) is attached to an eyebolt mounting screw hole 26 provided in the rotating shaft 21, and then the rotating shaft brackets 20A and 20B are attached via the eyebolt by an overhead crane 110 having one hook 111. hoisted. The work for lifting the rotary shaft bracket 20A and the work for lifting the rotary shaft bracket 20B are performed separately.

The rotary shaft brackets 20A and 20B are attached to the upper half 1 of the passenger compartment by horizontally moving the suspended rotary shaft brackets 20A and 20B with an overhead crane 110 and positioning them with respect to the upper half 1 of the passenger compartment. done later. The rotating shaft bracket 20A is arranged such that the base plate 23 of the bracket body 22 abuts against one side portion of the joint surface 4 in the turbine axial direction TD, and the plurality of bolt holes 6 and the plurality of base plate bolt holes 23A overlap each other. (see FIGS. 3B and 6), it is attached to the upper compartment 1 by means of bracket fastening bolts 23B. After the base plate 23 of the bracket body 22 is abutted against the portion on the other side of the joint surface 4 in the turbine axial direction TD, the rotating shaft bracket 20B is also attached to the upper compartment 1 in the same manner as described above.

In the rotary shaft brackets 20A and 20B attached to the upper half 1 of the passenger compartment, the respective rotary shafts 21 are coaxial and parallel to the turbine axial direction TD. Each rotating shaft 21 protrudes from the upper half of the casing 1 in the turbine axial direction TD and is positioned inside the upper half of the casing 1 when viewed in the turbine axial direction TD. The rotating shaft brackets 20A and 20B are attached to the upper compartment 1 so that the center axis of the rotating shaft 21 overlaps the center of gravity of the upper compartment 1 when viewed in the turbine axial direction TD. In this case, the vehicle upper half 1 can be stably rotated around the central axis of the rotating shaft 21 .

Here, in the illustrated example, the hook 111 and the eyebolt are connected by the chain block 61 and the relay wire 62 . The chain block 61 has a hook chain having a hook at one end, a hoisting portion that engages with a portion between one end and the other end of the hook chain and has a hook, and a hoisting chain and a hoisting chain for operating the hoisting portion. Then, when the hoisting chain is towed, one end of the hook chain is towed to the hoisting part side, and when the hoisting chain is towed, the hook chain is let out. In FIG. 9 , the hook at one end of the hook chain is connected to the relay wire 62 , and the hook of the hoisting part is hung on the hook 111 of the overhead crane 110 . When such a chain block 61 is used, it becomes easy to maintain the posture of the rotary shaft brackets 20A and 20B horizontally by operating the chain block 61, thereby improving work efficiency.

Next, as shown in FIG. 10, wires 300a to 300d are hung between the casing trunnions 2a to 2d of the casing upper half 1 and the hook 111 of the overhead crane 110, and the casing upper half 1 is lifted by the ceiling crane 110. lift.

Next, as shown in FIG. 11, the upper half of the passenger compartment 1 is placed on the reversing bases 40A and 40B via the rotary shaft brackets 20A and 20B. At this time, the rotating shaft 21 of the rotating shaft bracket 20A is rotatably supported on the support surface 41 of the reversing base 40A, and the rotating shaft 21 of the rotating shaft bracket 20B is rotatably supported on the supporting surface 41 of the reversing base 40B. Supported. At this time, the overhead crane 110 bears part or all of the load of the upper compartment 1 so that the entire load of the upper compartment 1 is not applied to the reversing bases 40A and 40B. As a result, it is possible to prevent the upper half of the passenger compartment 1 from unexpectedly rotating on the reversing bases 40A and 40B due to its own weight.

Next, as shown in FIGS. 12 and 13, one of the two connecting portions 25 on the outer peripheral surface of the rotating shaft 21 of the rotating shaft bracket 20A and one of the two tool holding portions 42 of the reversing base 40A are connected by a pulling wire 32 and a chain pulling tool 50. Also, the other of the two connecting portions 25 on the outer peripheral surface of the rotating shaft 21 of the rotating shaft bracket 20A and the other of the two tool holding portions 42 of the reversing base 40A connect the pulling wire 32 and chain pulling. It is connected by the tool 50. FIG. The two connecting portions 25 on the outer peripheral surface of the rotating shaft 21 of the rotating shaft bracket 20B and the two tool holding portions 42 of the reversing base 40A are also connected to each other by the pulling wire 32 and the chain pulling tool 50 respectively. .

Specifically, one end of the pulling wire 32 is connected to a connecting portion 25 on the outer peripheral surface of the rotating shaft 21 , and the pulling wire 32 is pulled out along the outer peripheral surface of the rotating shaft 21 . The other end of the traction wire 32 is hooked on a hook provided at one end of the chain of the chain traction tool 50 . A hook provided on the chain driving portion 51 of the chain pulling tool 50 is hooked to the tool holding portion 42 of the reversing base 40A. Here, the pulling wire 32 connected to one of the two connecting portions 25 on the outer peripheral surface of the rotating shaft 21 and the pulling wire 32 connected to the other of the two connecting portions 25 are connected to the rotating shaft. 21 are pulled out in opposite directions in the circumferential direction and connected to the corresponding chain puller 50 .

After the traction wires 32 and the chain traction tools 50 are provided as described above, each chain traction tool 50 is towed (hoisted up), and tension is applied to each traction wire 32, whereby the upper half of the passenger compartment 1 is lifted. It is held against rotation. After that, the chain block 61 and relay wire 62 provided between the hook of the overhead crane 110 and the eyebolt of the rotating shaft 21 are removed. At this time, confirm that the upper compartment 1 does not rotate due to its own weight. When the upper half 1 of the passenger compartment is about to rotate, the chain pulling tool 50 is pulled and the tension of the pulling wire 32 is increased so that the pulling wire 32 restricts the rotation.

Then, the upper half 1 of the passenger compartment is turned upside down. At this time, in each of the rotating shaft brackets 20A and 20B, a gap between one of the two connecting portions 25 on the outer peripheral surface of the rotating shaft 21 and one of the two tool holding portions 42 of the reversing base 40A While pulling the chain pulling tool 50, the chain pulling tool 50 between the other of the two connecting portions 25 and the other of the two tool holding portions 42 is extended (lowered). As a result, as shown in FIGS. 14 to 17, by rotating the rotating shaft 21 about the central axis of the rotating shaft 21, the upper half of the casing 1 rotates on the support surfaces 41 of the reversing mounts 40A and 40B. be done. Then, as shown in FIG. 17, when the joint surface 4 of the upper compartment 1 becomes horizontal and faces upward, the operation of the chain pulling tool 50 is stopped, and the rotation of the upper compartment 1 is stopped. Let

Next, the rotary shaft brackets 20A and 20B are removed. At this time, first, as shown in FIGS. Lift the upper half of the compartment 1. Then, as shown in FIG. 20, the upper half of the vehicle compartment 1 is placed on the setup pedestals 60A and 60B.

Then, the pulling wire 32 and the chain pulling tool 50 between the connecting portion 25 of each rotating shaft 21 and the tool holding portion 42 of the reversing base 40A are removed. After that, as shown in FIG. 21, the rotary shaft brackets 20A and 20B are lifted by the overhead crane 110 through the eyebolts and removed from the upper compartment 1. As shown in FIG.

In the present embodiment described above, the rotating shaft brackets 20A and 20B having the rotating shaft 21 are arranged on one side and the other side of the upper half 1 of the casing in the turbine axial direction TD, and It is attached to the upper half of the casing 1 so that it is coaxial with the rotating shaft 21 on the other side and parallel to the turbine axial direction TD. By rotating the rotary shaft 21 about the central axis of the rotary shaft 21, the upper half 1 of the passenger compartment is turned upside down. In such an upside-down method, it is not necessary to use an overhead crane when upside-down the upper half 1 of the passenger compartment. Further, when the rotating shaft brackets 20A and 20B having the rotating shaft 21 are attached to the upper half 1 of the vehicle compartment and the rotating shaft 21 is rotated, a tool (traction wire 32, chain traction tool, etc.) for applying force for rotation is used. 50) and the like can be easily attached to the rotating shaft 21, and the structure for attachment can be simplified. Therefore, according to the present embodiment, the vehicle interior half (upper vehicle interior half 1) can be easily turned upside down at low cost while the overhead crane usage time is minimized.

In particular, since the rotating shaft 21 is attached to the upper casing half 1 so as to protrude from the casing upper half 1 in the turbine axial direction TD, it is extremely easy to attach a tool for applying force for rotation. Further, in the present embodiment, one end of the traction wire 32 is connected to the outer peripheral surface of the rotating shaft 21, and the other end of the traction wire 32 is connected to one end of the chain of the chain traction device 50. The rotation shaft 21 is rotated by pulling the other end of the pulling wire 32 by the chain. When the rotating shaft 21 is used, it is possible to turn the upper half of the passenger compartment 1 upside down with a simple tool such as the pulling wire 32 and the chain pulling tool 50, so that the device cost and work load can be reduced. It becomes possible to suppress effectively.

The rotary shaft brackets 20A and 20B are attached to the upper half 1 of the passenger compartment so that the central axis of the rotary shaft 21 overlaps the center of gravity of the upper half 1 of the passenger compartment. In this case, the upper half 1 of the passenger compartment can be stably turned upside down. Further, in this embodiment, since the relative position of the rotary shaft 21 to the bracket main body 22 is adjustable, the position of the rotary shaft 21 can be easily adjusted to a desired position, ensuring convenience. .

The rotary shaft brackets 20A and 20B are attached to the upper compartment 1 by means of bracket fastening bolts 23B inserted into bolt holes 6 provided in the joint surface 4 of the upper compartment 1. As shown in FIG. In this case, the joint surface 4 receives the rotational force (torque) transmitted to the upper half of the casing 1 due to the rotation of the rotating shaft 21, thereby suppressing the occurrence of local excessive surface pressure on the joint surface 4. Therefore, it is possible to rotate the upper compartment 1 while suppressing undesirable damage between the rotary shaft brackets 20A and 20B and the upper compartment 1 .

In addition, the rotating shaft 21 is placed on the reversing bases 40A and 40B, and rotated on the reversing bases 40A and 40B, whereby the upper compartment 1 is turned upside down. In this case, the vehicle upper half 1 can be stably rotated. In particular, in the present embodiment, the rotating shaft 21 is rotatably supported on the supporting surfaces 41 provided on the reversing bases 40A and 40B and rotated on the supporting surfaces 41, so that the rotating shaft 21 can be rotated at a fixed position. The upper half 1 of the passenger compartment can be stably rotated while suppressing the work space.

An embodiment and its modification have been described above, but the above embodiment and modification are presented as examples and are not intended to limit the scope of the invention. The novel embodiments and modifications can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. The above-described embodiments, modified examples, and other modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

For example, in the above-described embodiment, the upside-down operation of the upper half casing 1 of the steam turbine has been described. It can also be applied to upside-down inversion of the lower half of the passenger compartment.

REFERENCE SIGNS LIST 1 Upper half of casing 1A Upper body 1B Flange 2a, 2b, 2c, 2d Trunnion 4 Joint surface 6 Bolt hole 20A, 20B Rotary shaft bracket 21 Rotating shaft 22 Bracket main body 23 Base plate 23A Base plate bolt hole 23B Bracket fastening bolt 23C Nut 24 Mounting plate 32 Traction wire 40A, 40B Reversing stand 41... Support surface 42... Tool holder 50... Chain traction tool 51... Chain drive part 60A, 60B... Set-up base 61... Chain block 62... Relay wire 100, 110... Overhead crane, DESCRIPTION OF SYMBOLS 101... Main winding hook, 102... Auxiliary winding hook, 111... Hook, 300a, 300b, 300c, 300d... Wire

Claims (13)

A method for vertically inverting a half casing of a steam turbine, comprising:
Rotating shaft brackets having rotating shafts are arranged on one side and the other side of the casing half in the turbine axial direction, the rotating shaft on one side and the rotating shaft on the other side are coaxial and the turbine axis attaching to the casing half so as to be parallel to the direction;
a step of rotating the rotating shaft about the central axis of the rotating shaft to turn the half casing upside down;
The casing halves and the other casing halves are connected by bolts inserted across bolt holes provided on the respective joint surfaces, with joint surfaces provided on the respective casing halves abutting against each other. has become
The rotary shaft bracket includes a bracket body having a base plate that abuts against the joint surface of the casing half, and in a state in which the base plate is abutted against the joint surface of the casing half, the The casing half is attached to the casing half by a bracket fastening bolt inserted into the bolt hole provided in the joint surface of the casing half and the bolt hole provided in the base plate . Upside down method. 2. The method for turning a casing half upside down according to claim 1, wherein said rotating shaft is attached to said casing half so as to protrude from said casing half in said turbine axial direction. 3. The method for turning upside down a vehicle interior half according to claim 1, wherein said rotating shaft bracket has a pair of mounting plates rising from said base plate, and said rotating shaft is supported between said pair of mounting plates. . further comprising a step of placing the rotating shaft on one side in the turbine axial direction and the rotating shaft on the other side on reversing mounts, respectively, and supporting the casing half on the reversing mounts;
4. The method of upside-down reversing a casing half according to any one of claims 1 to 3, wherein the casing half is turned upside down by rotating the rotary shaft on the reversing frame. The reversing frame has a support surface that rotatably supports the rotating shaft,
5. The method of upside-down inverting a passenger compartment half according to claim 4, wherein said rotating shaft is rotated on said supporting surface. 6. The upper and lower parts of the vehicle interior half according to claim 1, wherein the rotation shaft bracket is attached to the vehicle interior half such that the central axis of the rotation shaft overlaps with the center of gravity of the vehicle interior half. inversion method. A method for vertically inverting a half casing of a steam turbine, comprising:
Rotating shaft brackets having rotating shafts are arranged on one side and the other side of the casing half in the turbine axial direction, the rotating shaft on one side and the rotating shaft on the other side are coaxial and the turbine axis attaching to the casing half so as to be parallel to the direction;
a step of connecting one end of a traction wire to the outer peripheral surface of the rotating shaft and causing the traction wire to run along the outer peripheral surface of the rotating shaft ;
a step of rotating the rotating shaft about the central axis of the rotating shaft to turn the half casing upside down ;
A method for turning up and down a vehicle interior half, wherein the rotating shaft is rotated by pulling the other end of the pulling wire. 8. The upper and lower vehicle compartment halves according to claim 7, wherein the other end of the traction wire is connected to one end of a chain of a chain traction device, and the other end of the traction wire is pulled by the chain of the chain traction device. inversion method. A rotating shaft bracket attached to a steam turbine half casing for inverting the casing half, comprising:
a rotating shaft;
a bracket body that supports the rotating shaft and is attached to the vehicle compartment half,
When the bracket main body is attached to the casing half, the rotating shaft becomes parallel to the turbine axial direction, and the rotating shaft rotates about the central axis of the rotating shaft, thereby rotating the casing half. It is designed to rotate the body,
The casing halves and the other casing halves are connected by bolts that are abutted against joint surfaces provided on each side and are inserted across bolt holes provided on the joint surfaces. and
The bracket body has a base plate that abuts against the joint surface of the casing half, and penetrates the bracket body while the base plate is abutted against the joint surface of the casing half. a rotary shaft bracket that is attached to the vehicle compartment half by means of bracket fastening bolts that are inserted into the bolt holes and the bolt holes provided in the base plate . 10. The rotating shaft bracket according to claim 9, wherein said rotating shaft bracket has a pair of mounting plates rising from said base plate, and said rotating shaft is supported between said pair of mounting plates. A rotating shaft bracket attached to a steam turbine half casing for inverting the casing half, comprising:
a rotating shaft;
a bracket body that supports the rotating shaft and is attached to the vehicle compartment half,
When the bracket body is attached to the casing half, the rotating shaft is parallel to the turbine axial direction,
The rotary shaft is supported by the bracket body so as to be able to adjust its relative position with respect to the bracket body ,
A rotating shaft bracket that rotates the rotating shaft about the central axis of the rotating shaft to rotate the casing half . A rotating shaft bracket attached to a steam turbine half casing for inverting the casing half, comprising:
a rotating shaft;
a bracket body that supports the rotating shaft and is attached to the vehicle compartment half,
When the bracket body is attached to the casing half, the rotating shaft is parallel to the turbine axial direction,
A connection part capable of connecting one end of a traction wire is provided on the outer peripheral surface of the rotating shaft ,
A rotating shaft bracket that rotates the rotating shaft about the central axis of the rotating shaft to rotate the casing half . An inversion frame for supporting the half casing of a steam turbine via a rotating shaft bracket having a rotating shaft, which is attached to the half casing for vertically inverting the half casing,
A supporting surface for rotatably supporting the rotating shaft is provided on the upper part, and one end of the chain is connected to the other end of a traction wire having one end connected to the outer peripheral surface of the rotating shaft supported by the supporting surface. Equipped with a tool holding part on the side for holding the chain driving part of the chain traction tool,
A reversing cradle that rotates the rotating shaft on the support surface when one end of the chain moves toward the chain drive held by the tool holder.

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