JP3922416B2 - Assembly method of large parts for power plant and its assembly jig - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method for assembling large parts for a power plant and an assembling jig thereof, and in particular, a method for carrying in large parts used for a steam generator of a power plant and assembling them at a predetermined position. And an assembly jig thereof.
[0002]
[Prior art]
Generally, a steam generator of a thermal power plant includes a burner, a furnace, a heater, a reheater, and the like (not shown) and is housed in a large building. Among these, in a large steam generator, a water-cooled wall pipe (also referred to as a dividing wall) parallel to the side wall is arranged at the center of the furnace, or a large number of plate-like shapes parallel to the side wall at the inlet of the radial heater at the top of the furnace. Some have a water cooling wall to increase the heat transfer area. The water-cooled wall tube or the water-cooled wall portion is composed of large parts, and the shape thereof is a hollow triangular shape, a trapezoidal shape, a D-shaped shape, or the like in a side view in addition to a flat plate shape.
[0003]
FIG. 10 is a partial configuration diagram illustrating an example using a large component, and FIG. 11 is a diagram illustrating an assembly work state of the large component. 12 is a side view of the construction jig, FIG. 13 is a plan view, and is a view taken in the direction of arrow Y in FIG.
[0004]
In FIG. 10, a U-shaped first pendant coil 103 and a second pendant coil 105 are suspended from a ceiling steel frame 101 with a predetermined distance therebetween. A large number of first pendant coils 103 and second pendant coils 105 are arranged at predetermined intervals in a state of being arranged in parallel in the vertical direction of the drawing. Above the first pendant coil 103 and the second pendant coil 105, a ceiling wall tube 107 intersecting with both is arranged in parallel with the ground (FL) and continuous in the vertical direction of the drawing. An upper screen tube 109 is disposed between the first pendant coil 103 and the second pendant coil 105 so as to penetrate the ceiling wall tube 107. A large number of upper screen tubes 109 are arranged in a state of being arranged in parallel at a predetermined interval in the vertical direction of the drawing.
[0005]
Further, a nose panel 111 which is a large-sized water-cooled wall tube is divided into a plurality of parts and arranged in the vicinity below the first pendant coil 103. The nose panel 111 is formed in a substantially trapezoidal shape with a hollow upper portion in a side view. The center portion of the nose panel 111 includes a V-shaped first water cooling wall 113 and a bottom lower screen tube 115. Also, a substantially flat second water cooling wall 117 is provided at one end of the nose panel 111 so as to extend along the bottom side. Further, a lower screen tube 115 protrudes with a certain length on the other end of the nose panel 111 and above the center. The nose panel 111 has a first suspension fitting 119 (shown in FIGS. 12 and 13) at the center end, and a second suspension fitting 121 (shown in FIG. 11) in the vicinity of the end of the second water cooling wall 117. Is shown). A plurality of lower screen tubes 115 are arranged at the same position as the upper screen tube 109 in a state of being arranged in parallel at a predetermined interval in the vertical direction of the drawing. The lower screen tube 115 is welded after being aligned with the upper screen tube 109 by an assembling method and an assembling jig described later, and is joined by the upper screen tube 109. Thus, the nose panel 111 fixed to the lower screen tube 115 is held by the upper screen tube 109 via the lower screen tube 115.
[0006]
The divided nose panel 111 is mounted on a carry-in carriage 123 (shown in FIGS. 7 and 11) and carried below the first pendant coil 103. In this state, the first hanging bracket 119 is provided with a hanging jig 125 shown in FIG. A balance 127 made of I-shaped steel is connected to the hanging jig 125 by a rotating plate 145 so as to be swingable. A first wire 133 suspended from a large hook 131 of a large crane (not shown) is attached to the balance 127 via a pin 129. As shown in FIG. 10, the large hook 131 is provided with a hole (not shown) that is provided above the ceiling wall tube 107 through a temporary hole (H) for lifting the nose panel 111 from the ceiling wall tube 107. The holes (H) are connected to a large crane as many as the nose panel 111 is divided, and are closed when the nose panel 111 is attached at a predetermined position. The balance 127 is fixedly provided with three rods 135 connected to a suspension jig 125 shown in Fig. 12. The shackle 121a of the second suspension fitting 121 has a crawler crane or a truck crane (not shown). A second wire 139 suspended from a small hook 137 of a small crane such as the above is attached.
[0007]
In FIG. 12, the hanging jig 125 includes two plates 141, a hollow pipe 143, a rotating plate 145, a first bolt 147, and two second bolts 149a and 149b. Each of the two plates 141 has a first hole 141a on one end of the lower screen tube 115 side, a second hole 141b on the center, and a third hole 141c on the other end. . A hollow pipe 143 is disposed concentrically in the first hole 141a and is sandwiched between two plates 141. A first bolt 147 is inserted and tightened into the first hole 141a and the hollow pipe 143, and the two plates 141 are integrated. The rotating plate 145 has a fourth hole 145a and a fifth hole 145b at both ends. The rotating plate 145 is inserted between the two plates 141, and is arranged so that the fourth hole 145a and the second hole 141b of the two plates 141 are concentric. A second bolt 149a is inserted into both the holes, and the second bolt 149a supports the rotating plate 145 so as to be rotatable. A connection pin 151 (shown in FIGS. 11 and 12) connected to one of the three rods 135 of the balance 127 is inserted into the fifth hole 145 b of the rotating plate 145, and the hanging jig 125 is connected via the connection pin 151. Is suspended so that it can swing freely.
[0008]
In the third hole 141c of the plate 141, a second bolt 149b penetrating the first suspension fitting 119 is inserted and tightened. The plate 141 is attached to the nose panel 111 via the first suspension fitting 119. The plate 141 has a flat portion 141d at one end on the lower screen tube 115 side. The flat portion 141 d is in contact with a shear lug 153 fixed to the lower screen tube 115. As a result, the nose panel 111 is composed of the plate 141 via the first suspension fitting 119 attached to the nose panel 111 and the plate 141 of the hanging jig 125 in contact with the shear lug 153 of the lower screen tube 115. While being held, the plate 141 of the lifting jig 125 is lifted by the three rods 135 of the balance 127 connected to the rotating plate 145. At this time, the rotation center point Qa of the rotating plate 145 is separated from the central axis Pa of the lower screen tube 115 by a distance La.
[0009]
Next, the operation of the above configuration will be described.
As described above, the divided nose panel 111 is mounted on the carry-in carriage 123 and carried below the first pendant coil 103 as shown in FIG. In this state, a hanging jig 125 is attached to the first hanging bracket 119. A shackle 121 a is attached to the second hanging bracket 121. The large hook 131 is suspended below the ceiling wall tube 107 in order to lift the nose panel 111 through a hole (H) provided temporarily in the ceiling wall tube 107. The first hook 133 is wound around the large hook 131 and the balance 127 is suspended from the large hook 131 of a large crane (not shown) via a pin 129. The rod 135 of the balance 127 is connected to the hanging jig 125 via a connecting pin 151. As a result, the large hook 131 is connected to the nose panel 111 via the hanging jig 125 attached to the upper side of the other end of the central portion of the nose panel 111.
[0010]
A second wire 139 is attached to the second suspension fitting 121 of the second water cooling wall 117 of the nose panel 111 via a shackle 121a. The second wire 139 is wound around a small hook 137, and the small hook 137 is suspended from a small crane such as a crawler crane or a truck crane (not shown) disposed indoors.
[0011]
As a result, the nose panel 111 is engaged with the large hook 131 via the suspension jig 125 on the upper side of the other end of the center portion, and the second suspension fitting 121 is connected to the other end of the second water cooling wall 117. Through which the small hook 137 is engaged and lifted. From this state, the large hook 131 is lifted further upward, the small hook 137 is suspended downward, and the nose panel 111 is raised to the arrow E side. The nose panel 111 is lifted upward by a predetermined amount by the large hook 131, and the lifting amount and the lifting position of the large hook 131 are adjusted according to the position of the end of the upper screen tube 109, The position of the end of the upper screen tube 109 is made to coincide with the position of the end of the lower screen tube 115. When the end positions of the upper screen tube 109 and the lower screen tube 115 coincide, the end portions are welded, and the nose panel 111 is held by the upper screen tube 109. Thereafter, the hole (H) provided temporarily is closed, and the balance 127 and the hanging jig 125 are removed and the next nose panel 111 is assembled.
[0012]
[Problems to be solved by the invention]
However, the above conventional assembling method and assembling jig have the following drawbacks.
(1) In order to suspend the nose panel of a large part from the loading carriage to a predetermined position, after temporarily providing a hole through which the large hook for a large crane passes in the ceiling wall pipe, the large hook is attached to the ceiling wall pipe. Located on the lower side. The large hook lifts the nose panel to a predetermined position via the balance, and when the end positions of the upper screen tube and the lower screen tube are aligned and welded, the balance is removed, and then the large hook is temporarily attached to the ceiling wall tube. The large hook is returned to the upper side of the ceiling wall pipe through the provided hole. The temporary hole is required to be closed after the nose panel is lifted and held at a predetermined position, and wasteful work is being performed and the number of work steps is increased.
(2) Since there are three suspension points for suspending the nose panel of a large component, a balance that is long in the lateral direction is required. When the divided large nose panels are successively lifted, the balance cannot be moved laterally by the crane because the wire for hanging the large hook penetrates the hole provided temporarily in the ceiling wall pipe. For this reason, after the balance is once lowered, it is moved laterally by another crane or the like. For this reason, it takes a lot of time for the carry-out changeover, and the number of work steps is increased.
(3) The balance is arranged in parallel with the upper screen tube when the nose panel is attached. When the end positions of the upper screen tube and the lower screen tube are matched, the balance is accidentally attached to the upper screen tube. There is a risk of bending and bending the upper screen tube.
(4) The hanging jig is a jig to which a rotating plate is attached. However, since there is a distance between the rotation center point of the rotating plate and the central axis of the lower screen tube, the nose panel of a large part is turned. When turning around the center of movement, the balance tends to tilt, the balance rotates, or the position of the large hook easily shifts, making it difficult to match the end positions of the upper and lower screen tubes. Therefore, it takes a lot of time to make them coincide, and the number of work steps is increasing.
[0013]
The present invention pays attention to the above-mentioned conventional problems, and relates to a method for assembling large parts for a power plant and its assembling jig, and in particular, it is not necessary to dispose a suspension jack below the ceiling wall pipe. The work is abolished, the number of work steps is reduced, the center of rotation of the hanging jig is aligned with the center axis of the pipe arranged in the horizontal direction, and the ends of the upper and lower pipes are easily aligned during rotation. An object of the present invention is to provide a method for assembling a large-sized part for a power plant and an assembling jig for facilitating the work.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, a first invention of a large power plant assembly method according to the present invention includes a ceiling wall pipe, a pendant coil, or a pendant coil disposed in a steam generator of a power plant. In the assembly method of large parts for power plants that have large parts that are suspended, such as water-cooled wall pipes, a lifting jack is attached to one end of the large parts that are carried by the transport carriage. A pivot center of a suspension jig connected to a rod of a lifting jack attached to a pipe suspended through a ceiling wall pipe, and a pipe attached in parallel to a large part The center axis of the Attach a hanging hook to the other end and lift a large part by a certain amount, then lower the hanging hook. , Make the central axis of both pipes coincide by turning large parts, This is an assembling method in which a large part is suspended at a certain position by lifting it with a lifting jack again.
[0015]
A second invention of a method for assembling a large-sized part for a power plant according to the present invention is a ceiling wall tube disposed in a steam generator of a power plant, a pendant coil suspended from the ceiling, and a pendant In the assembly method of large parts for power plants having large parts suspended such as water-cooled wall pipes arranged near the coil, the parts are lifted on one end side of the large parts carried by the carriage. Install the jack for A pivot axis of a suspension jig connected to a rod of a lifting jack attached to a pipe suspended through a ceiling wall pipe, and a central axis of a pipe attached in parallel to a large part Match And after attaching a hanging hook to the other end and lifting a large part by a certain amount, lower the hanging hook. , The central axes of both pipes are aligned by turning large parts It is an assembly method that hangs large parts after joining both pipes.
[0017]
In the invention of the large-sized part assembly jig for a power plant according to the present invention, a ceiling wall pipe disposed in the steam generator of the power plant, a pendant coil suspended from the ceiling, and the vicinity of the pendant coil In a large part assembly jig for a power plant having a suspended large part such as a water-cooled wall pipe disposed in Suspended A hanging jig that is connected to the rod of a lifting jack attached to the pipe, and whose center axis of the pipe attached in parallel to the large part coincides with the turning center point for turning the large part. An assembly jig having
[0018]
[Action]
According to the above configuration, for example, when a large part is assembled in the steam generator of the thermal power plant, the large part is carried into the building by the carry-in carriage. A lifting jack for suspending large parts is arranged under the ceiling wall pipe, and one end of the lifting jack is attached to one side of the large part, and the other side of the large part is attached to the other side. Attach the wire from the hook of the small crane. By operating the lifting jack and the small crane, a large part is lifted by a certain amount from the carrying cart to a portion where there is no interference such as a pendant coil or a carrying cart. The large part is kept in its position with the lifting jack as it is, and the small hook is lowered, and the large part is rotated by a hanging jig connected to the lifting jack. The lifting jack is attached to the upper screen tube penetrating the ceiling wall tube, and the telescopic rod of the lifting jack is connected to a rotatable lifting jig attached to a large part. Therefore, when the large component rotates, the end positions of the upper screen tube holding the lifting jack and the lower screen tube attached to the large component are surely matched. At this time, the suspension jig has a center point of rotation for rotating the large part that matches the central axis of the arrangement of the pipes attached to the large part. It is possible to accurately match the end positions of each other. Moreover, since the lifting jack is attached to the upper screen tube in advance according to the number of divided large parts, the operation and operation of a large crane, etc. are eliminated, and the divided large type Setup work to install parts is easy.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a method for assembling a large-sized part for a thermal power plant and an assembling jig thereof according to the present invention will be described in detail with reference to the accompanying drawings.
1 is a partial perspective view of a large-sized assembly jig 1 for a thermal power plant, FIG. 2 is a front view, FIG. 3 is a partial side view, and is a view from the arrow W in FIG. 2, and FIG. 2 is a partial plan view, FIG. 5 is a partial plan view, FIG. 2 is a U arrow view, and FIG. 6 is a plan view of a large component. FIG. 7 to FIG. 9 are diagrams showing the assembled construction state of large parts. In addition, the same code | symbol is attached | subjected to the same component as a conventional component, and description is abbreviate | omitted.
[0020]
1 to 4, a large-sized assembly jig 1 for a thermal power plant is composed of a lifting jack portion 5 and a hanging jig portion 7.
In FIG. 1 to FIG. 3, the lifting jack portion 5 is disposed below the ceiling wall tube 107, and the lifting jack portion 5 is a lifting jig to be described later when lifting a large nose panel 111. It is connected to part 7. The lifting jack portion 5 is composed of a lifting jack table 11 and a lifting jack 13. The lifting jack table 11 includes a pair of groove steels 15 a and 15 b, a pair of flat plates 17 a and 17 b, a first fixing bolt 19, and a base plate 20.
[0021]
The pair of groove steels 15a and 15b is placed on a bracket 109d fixed to the upper screen tube 109, and is attached at a predetermined position with the adjacent upper screen tubes 109a and 109b interposed therebetween.
[0022]
The pair of flat plates 17a and 17b are attached after the adjacent upper screen tubes 109a and 109b are sandwiched by the first fixing bolts 19 at both ends of the pair of groove steels 15a and 15b. Accordingly, the pair of grooved steels 15a and 15b are fixed so as not to be opened after the adjacent upper screen tubes 109a and 109b are sandwiched between the brackets 109d.
[0023]
The base plate 20 is placed on the pair of grooved steels 15a and 15b, and is disposed at a central position between the upper screen tubes 109a and 109b. The base plate 20 is fixed to the grooved steels 15a and 15b with bolts (not shown). In addition, the base plate 20 has the lifting jack 13 attached thereto and, like the pair of flat plates 17a and 17b, after the pair of groove steels 15a and 15b sandwich the upper screen tubes 109a and 109b. It is fixed not to open.
[0024]
The lifting jack 13 is composed of a jack body 21, a rod 23, and a nut 25.
The jack body 21 is attached to the base plate 20, and a piston (not shown) connected to the rod 23 is inserted into the inside of the jack body 21 and receives the hydraulic pressure to raise or lower the rod. The rod 23 has an upper portion 23a protruding from the jack body 21 and a lower portion 23b connected to a later-described hanging jig portion 7 which is rotatable by a nut 25.
[0025]
As shown in Japanese Patent Application Laid-Open No. 7-309594 previously filed by the present applicant, the lifting jack 13 is mechanically fixed by a certain amount so that the nose panel 111 of a large part does not fall. It may be an up / down jack that moves up and down while being locked, or a hydraulic cylinder with a check valve or a hydraulic cylinder using a counter balance valve.
[0026]
In FIG. 1, FIG. 2, and FIG. 4, the hanging jig part 7 is composed of a rotating body support part 31 and a rotating body part 33. One hanging jig portion 7 is attached to each end portion of the divided nose panel 111, and two suspension jig portions 7 are prepared for one nose panel 111.
[0027]
The rotator support 31 includes a first rotator support 31a and a second rotator support 31b that rotatably support the rotator 33 therebetween. The first rotating body support portion 31a is attached to the lower screen tube 115a, and the second rotating body support portion 31b is attached to the lower screen tube 115b. Since the first rotating body support portion 31a and the second rotating body support portion 31b are different only in a portion where a later-described rotation support plate 49 that rotatably supports the rotating body portion 33 is attached, A part is demonstrated using the 1st rotary body support part 31b.
[0028]
The rotator support 31b mainly includes two support plates 41, a hollow tube 43, a first connection plate 45, a second connection plate 47, a rotation support plate 49, and a first connection bolt 51. It is configured. The two support plates 41 have a first connecting bolt hole 41a on the lower screen tube 115b side at one end, a second connecting bolt hole 41b on the center, and a third connecting bolt hole on the other end side. 41c is opened in each plate. A hollow tube 43 is disposed concentrically in the first connecting bolt hole 41 a, and the hollow tube 43 is sandwiched between two support plates 41. The first connection bolt 51 is inserted into the first connection bolt hole 41 a and the hollow tube 43 and tightened, and the two support plates 41 are integrated. Further, the first connection plate 45 and the second connection plate 47 are fixed to the two support plates 41 to strengthen the integration of the two support plates 41. The support plate 41 is attached to the nose panel 111 via the first suspension fitting 119. The support plate 41 has a flat portion 41d at one end on the lower screen tube 115b side. The flat portion 41d is in contact with a shear lug 153 fixed to the lower screen tube 115b.
[0029]
The rotation support plate 49 is attached to the inside of the opposite support plate 41, and a hole 49 a into which a support pin 71 that supports the rotating body portion 33 described later is inserted is formed above the rotation support plate 49. The rotation support plate 49 is connected and integrated by a connecting plate 53.
[0030]
A first rotating body support portion 31a and a second rotating body support portion 31b that support the rotating body portion 33 of the hanging jig portion 7 are connected to and integrated with the second connecting bolt hole 41b in the center portion. Two connecting bolts 55 are inserted and fastened with a second nut 57.
[0031]
The third connection bolt 59 penetrating the first suspension fitting 119 is inserted into the third connection bolt hole 41 c on the other end side and fastened by the third nut 61. The third connecting bolt 59 connects and integrates the first rotating body support portion 31a and the second rotating body support portion 31b, and the hanging jig portion 7 is connected to the nose panel 111 via the first hanging bracket 119. It is connected.
[0032]
The rotator 33 is inserted into a hole 49 a of a rotation support plate 49 attached to the first rotator support 31 a and the second rotator support 31 b and is held by a support pin 71.
The rotator 33 is disposed in a rectangular plate 73 that is opposed to both ends, and is inserted into the plate 73, spaced apart by a predetermined distance so that the rod 23 penetrates, and a groove shape that is disposed to face the surface side. A steel plate 75, a holding plate 77 that is fixedly disposed between the groove-shaped steel 75 and holds the support pin 71, and a rod that is fixed to the center portion on the lower surface of the groove-shaped steel 75 and penetrates the rod 23 The rod plate 79 has holes 79a. The rod hole 79a has a certain clearance with respect to the rod 23 to facilitate assembly.
[0033]
The rotator 33 is rotatably connected to the first rotator support 31a and the second rotator support 31b via a support pin 71. That is, the first rotating body support portion 31a and the second rotating body support portion 31b fixed to the nose panel 111 rotatably support the rotating body portion 33 by the support pins 71, and the rotating body portion. The nose panel 111 is lifted by the lifting jack 13 by being connected to the rod 23 b of the lifting jack 13 through 33. At this time, the center position Ra of the support pin 71 coincides with the center axis Pa of the lower screen tubes 115 arranged in parallel as shown in FIG. Thereby, the suspension jig portion 7 is configured such that the end portions of the upper screen tube 109 and the lower screen tube 115 coincide with each other when the rotating body portion 33 rotates.
[0034]
When the center axis line of the upper screen tube 109 coincides with the center axis line Pa of the lower screen tube 115, the lifting jack 13 is contracted to end the upper screen tube 109 and the lower screen tube 115 as shown in FIG. The parts can be brought into contact. At this time, the hanging jig portion 7 is attached to the lower screen tube 115 that is adjacent to both ends of the nose panel 111, and the lower screen tube 115 is arranged in series in the lateral direction of the nose panel 111. And as shown in FIG. 6, the suspension jig | tool part 7 is attached to the both ends which this lower screen tube 115 adjoins. For this reason, even if the nose panel 111 is held by the hanging jig part 7, it is supported vertically without rising in the lateral direction. For this reason, the end portions of the upper screen tube 109 and the lower screen tube 115 can reliably contact each other. When the end portions of the upper screen tube 109 and the lower screen tube 115 come into contact with each other, the upper screen tube 109 can suspend the large nose panel 111 via the lower screen tube 115 by welding the contact portions. .
[0035]
The operation of the embodiment of assembling the nose panel 111, which is an example of the large-sized assembly jig 1 for a thermal power plant configured as described above, is as follows, and will be described with reference to FIGS. To do.
(1) In FIG. 7, the divided nose panel 111 of the large component for a thermal power plant is mounted on a carry-in cart 123 and carried below the first pendant coil 103. In this state, the nose panel 111 has the hanging jig portion 7 of the assembling jig 1 attached to the adjacent lower screen tubes 115 at both ends. A plurality of lifting jack portions 5 of the assembling jig 1 are attached to a predetermined upper screen tube 109 on a predetermined upper screen tube 109 facing the hanging jig portion 7. The lifting jig portion 7 is connected by the rod 23b of the lifting jack portion 5 so that the lifting jack 13 is attached to the upper side of the other end of the center portion of the nose panel 111. It is connected to the nose panel 111 via the part 7.
[0036]
A second wire 139 is attached to the second suspension fitting 121 of the second water cooling wall 117 of the nose panel 111 via a shackle 121a. The second wire 139 is wound around a small hook 137, and the small hook 137 is suspended from a small crane such as a crawler crane or a truck crane (not shown) disposed indoors.
[0037]
Thereby, the upper side of the other end of the center portion of the nose panel 111 is engaged with the lifting jack 13 via the hanging jig portion 7, and the other end portion side of the second water cooling wall 117 is the second hanging bracket. 121, the nose panel 111 is engaged with the small hook 137 through the operation of the lifting jack 13 and the small hook 137, and the nose panel 111 moves from the carry-in cart 123 to a portion where there is no interference such as the first pendant coil 103 or the carry-in cart 123. A certain amount (Ha) is suspended.
[0038]
(2) In FIG. 8, after the nose panel 111 is lifted by a certain amount (Ha) (the state of FIG. 7), the contraction of the rod 23b of the lifting jack 13 is temporarily stopped and attached to the nose panel 111. While holding the position, the hanging jig part 7 hangs the small hook 137 downward and causes the nose panel 111 to rotate counterclockwise (arrow Ma direction). As the nose panel 111 rotates, the center axis of the upper screen tube 109 automatically matches the center axis Pa of the lower screen tube 115. That is, as the nose panel 111 rotates, the end of the lower screen tube 115 comes to be on the axis of the end of the upper screen tube 109.
[0039]
(3) In FIG. 9, the nose panel 111 reduces the rod 23b of the lifting jack 13 and is further lifted upward by a predetermined amount (Ja). At this time, the rod 23b of the lifting jack 13 has a larger protruding amount as a rod 23a above the lifting jack 13. As the nose panel 111 is raised, the end of the upper screen tube 109 automatically matches the position of the end of the lower screen tube 115 and comes into contact therewith. When the end portions of the upper screen tube 109 and the lower screen tube 115 come into contact with each other, the contact portions are welded. Thereby, the nose panel 111 can be suspended by the ceiling steel frame 101 via the upper screen tube 109 and the lower screen tube 115, and large parts are assembled.
[0040]
【The invention's effect】
As described above, according to the present invention, a lifting jack for hanging a large part disposed below a ceiling wall pipe has one end attached to one side of the large part and the other side small. After attaching the wire from the hook of the crane and operating the lifting jack and small crane, large parts are lifted by a certain amount from the loading cart to the part where there is no interference such as pendant coil or loading cart, Since the large part is rotated at the place by the lifting jig connected to the lifting jack, the work can be performed safely. When a large part is rotated by a lifting jig, the end position of the upper screen tube holding the lifting jack and the lower screen tube attached to the large part can be easily matched, improving workability. is doing. In addition, the hanging jig matches the rotation center point for rotating the large component with the central axis of the horizontal arrangement of the pipes attached to the large component. Since the tube center axes of the upper screen tube and the lower screen tube can be made to coincide with each other only by moving, the operation is facilitated and the adjustment operation is not required, so that the operation time can be shortened. Moreover, since the lifting jack is attached to the upper screen tube in advance according to the number of divided large parts, the operation and operation of a large crane, etc. are eliminated, and the divided large type Setup work to install parts is easy. A suspension jack is disposed under the ceiling wall pipe, and unnecessary work such as drilling and closing as in the prior art is eliminated, so that the number of work steps can be reduced. In addition, the jig for assembling large parts has improved safety because a suspension jack that operates reliably is provided.
[Brief description of the drawings]
FIG. 1 is a partial perspective view of an assembling jig for a large-sized part for a thermal power plant according to an embodiment of the present invention.
FIG. 2 is a partial front view of an assembling jig for a large-sized component for a thermal power plant according to an embodiment of the present invention.
3 is a partial side view of an assembly jig for a large-sized part for a thermal power plant according to an embodiment of the present invention, and is a view taken in the direction of arrow W in FIG. 2;
4 is a partial side view of an assembling jig for a large-sized component for a thermal power plant according to an embodiment of the present invention, and is a view taken in the direction of arrow V in FIG. 2;
5 is a partial plan view of an assembling jig for a large-sized component for a thermal power plant according to an embodiment of the present invention, and is a view taken in the direction of the arrow U in FIG. 2;
FIG. 6 is a partial plan view of an assembling jig for a large-sized part for a thermal power plant according to an embodiment of the present invention.
FIG. 7 is a diagram showing an assembled construction state of large-sized parts for a thermal power plant according to the embodiment of the present invention.
FIG. 8 is a diagram showing an assembled construction state of large-sized parts for a thermal power plant according to an embodiment of the present invention.
FIG. 9 is a diagram showing an assembled construction state of large components for a thermal power plant according to an embodiment of the present invention.
FIG. 10 is a partial configuration diagram showing an example of a conventional large component for a thermal power plant.
FIG. 11 is a view showing a state of assembly of a conventional large component.
FIG. 12 is a side view of a conventional assembly jig for large parts for a thermal power plant.
13 is a plan view of a conventional assembly jig for large parts for a thermal power plant, and is a view taken in the direction of arrow Y in FIG. 12;
[Explanation of symbols]
1 Assembly jig for large parts for thermal power plant
5 Jack for lifting
7 Suspension jig part
11 Lifting jack stand
13 Lifting jack
21 Jack body
23 Rod
31 Rotating body support
33 Rotating body
49 Rotating support plate
71 Support pin
101 Ceiling steel frame
103 1st pendant coil
105 Second pendant coil
107 Ceiling wall pipe
109 Upper screen tube
111 Nose panel for large parts
115 Lower screen tube
121 Second bracket
123 Carriage
137 Small hook
Ra Support pin center position
Pa Center axis of lower screen tube (upper screen tube)

Claims (3)

In the assembly construction method of large parts for power plants that have suspended large parts such as ceiling wall pipes, pendant coils, or water-cooled wall pipes arranged in the steam generator of the power plant,
A suspension jack attached to a rod of a lifting jack attached to a pipe suspended through a ceiling wall pipe by attaching a lifting jack to one end side of a large part carried by a carriage. The center of rotation of the tool and the center axis of the pipe attached in parallel to the large part are aligned, and a hanging hook is attached to the other end of the large part to lift the large part by a certain amount. Later, the hanging hook is lowered, the central axes of both pipes are made to coincide with each other by turning the large parts, and then the large parts are suspended by a lifting jack to suspend the large parts at a fixed position. Assembly method for large-scale parts. A ceiling wall tube disposed in a steam generator of a power plant, a pendant coil suspended from the ceiling, and a suspended large part such as a water-cooled wall tube disposed in the vicinity of the pendant coil; In the assembly method of large parts for power plants having
A suspension jack attached to a rod of a lifting jack attached to a pipe suspended through a ceiling wall pipe by attaching a lifting jack to one end side of a large part carried by a carriage. After aligning the center of rotation of the tool and the central axis of the pipe attached in parallel to the large part, and attaching a hanging hook to the other end side, lifting the large part by a certain amount, Assembly of large parts for a power plant characterized by lowering the hanging hooks and aligning the central axes of both pipes by turning the large parts and then hanging the large parts by joining both pipes Construction method. A ceiling wall tube disposed in the steam generator of the power plant, a pendant coil suspended from the ceiling, and a suspended large part such as a water-cooled wall tube disposed in the vicinity of the pendant coil; In assembly jigs for large parts for power plants having
It is connected to the rod of the lifting jack attached to the pipe suspended through the ceiling wall pipe, and rotates the central part of the pipe attached in parallel to the large part and the large part. A jig for assembling a large-sized part for a power plant, comprising a hanging jig that coincides with a rotation center point.

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