JP3018061B2 - Work stage in boiler furnace and how to move it - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is directed to a coal-fired boiler, a heavy oil-fired boiler, an LPG-fired boiler, etc. in a thermal power plant or the like. The present invention relates to a work stage assembled in a boiler furnace and a method of moving the work stage.

[0002]

2. Description of the Related Art Conventionally, a periodic inspection of a boiler furnace in a thermal power plant has to be carried out on a stable work platform by using Japanese Patent Publication No. 5-40.
No. 108, "Scaffolding device for operation in boiler furnace"
It is proposed to form a work stage with a stairwell corridor structure in a boiler furnace, hang the work stage on a suspension iron structure at the furnace ceiling with a wire rope, and wind up or rewind the wire rope. By moving the work stage up and down, the workability in assembling and disassembling the tower-shaped fixed scaffold in the boiler furnace is greatly reduced, and the maintenance, inspection and repair work of the furnace wall, the furnace water pipe, etc. are dealt with. I have.

By the way, the size of a boiler furnace is large enough to accommodate a few tennis courts, and is 3,40-7,8.
The skyscraper, which is 0 meters high, is so large that it can fit inside. Looking at the internal structure of the boiler furnace, a wedge-shaped or mountain-shaped projecting portion (referred to as a deflection arch, commonly called a differential arch) is located at a height of about 60 to 70% of the boiler height. Are fixedly formed,
Further, a partition-type superheater element or a plate-type heater element is arranged in line directly above the overhang portion or on the ceiling portion of the boiler furnace. The structure and layout of these superheater elements and deflection arches vary depending on whether the boiler furnace is LPG-fired, heavy oil-fired, or coal-fired.

[0004]

Therefore, when the work stage having the above-mentioned corridor structure is lifted to the upper part of the furnace, it cannot be naturally lifted upward from the deflection arch. After raising the working stage of the structure to just below the overhang, the scaffolding material must be lifted from the bottom of the furnace with a gondola, and a fixed scaffold extending upward from the corridor of the working stage must be separately constructed. Moreover, in the case of the work stage having the corridor structure, even if the fixed scaffold is constructed in the corridor portion, various operations such as maintenance, inspection, and repair of the furnace ceiling in the atrium portion inside the corridor portion cannot be performed.

Therefore, one of the applicants of the present invention is disclosed in Japanese Utility Model Laid-Open No. 5-3.
In the "working station" described in Japanese Patent No. 479, the work station can be raised to a position directly below the deflection arch, and the work stage can be raised to the ceiling avoiding the deflection arch. It proposes a work stage to perform various operations such as maintenance, inspection and repair in the boiler furnace on a stable work platform. However, both are constructed independently of each other, promoting further safety of work and shortening of assembly period, and improving the structure to be practical and excellent in work efficiency and economy. Is desired.

[0006]

In the present invention, therefore, the advantage of a lifting device using a work stage having a two-part structure, that is, the lifting and lowering movement to the ceiling of the boiler furnace and the deflection arch is mainly performed. In order to make it possible, in terms of equipment, the work stage formed in the boiler furnace is suspended by a wire rope on a suspension frame at the furnace ceiling, and the wire rope hoist is wound up or rewinded. In the work stage in the boiler furnace configured so that the work stage moves up and down in the boiler furnace, the work stage is formed by a front work stage and a rear work stage, and the rear work is performed. Between the top position near the inner end of the stage and the bottom position near the inner end of the front working stage, the folding legs are stacked in multiple stages in the width direction and connected. The bellows frame interposed a, folded the bellows frame, it was provided a working stage of the boiler furnace comprising constituting the front side work stage and the rear side work stage stepped state launched. In this way, by connecting the front-side work stage and the rear-side work stage with a collapsible frame that can be extended vertically, the vicinity of the deflection arch, the ceiling of the boiler furnace and the superheater The maintenance, inspection, repair work, and the like for the element can be performed safely and under a stable scaffolding condition.

[0007]

In a method, a work stage is assembled and formed at the bottom of the boiler furnace, and the work stage is suspended by a wire rope, and then the wire rope hoist is wound up or unwound. In the method of constructing and moving a work stage in a boiler furnace by moving up and down in a boiler furnace, a front work stage is assembled and formed in approximately the first half of a furnace bottom stage, and the front work stage is appropriately raised in height. Position, and then assemble and form the rear work stage almost at the rear half of the hearth stage.In the upper position near the inner end of the rear work stage, multiple sets of folding legs are multi-staged. Attach the lower end of the bellows frame that is stacked and foldable and connected,
After suspending the lifted front-side work stage to the uppermost position of the bellows frame, the upper end of the bellows frame is connected to a bottom position near the inner end of the front-side work stage. First, the front work stage is lifted by one stage of the bellows frame, the folding legs in the uppermost bellows frame are raised, and a brace is inserted into and connected to the adjacent folding legs. The work stage is lifted by one step, the folding legs in the bellows frame of the next rank are raised, the braces are connected to the adjacent folding legs, and this is repeated by the number of the bellows frames, thereby repeating the entire bellows frame. The work stage in the boiler furnace, in which the whole of the front work stage and the rear work stage are tuned up and then lifted to the upper part of the furnace. .

[0008]

First, in FIG. 2 showing the general outline of the boiler furnace, F is a boiler furnace for burning LPG, the main body of which is formed in a rectangular tube structure, and the bottom of which is a hopper having a gentle slope. It has a furnace structure. Reference numeral 1 denotes a mountain-shaped deflection arch which is formed to protrude above the furnace rear wall 2 and has a height (35 to 40) of the boiler furnace F.
Meters) is usually formed at a position of about 60 to 70%. Therefore, an upper furnace 4 is formed on an upper side portion from the tip of the arch 1 to the furnace ceiling wall 3 with the deflection arch 1 as a boundary. A combustion furnace 6 is formed in a main body part extending to the furnace bottom 5. 7 is the furnace bottom 5
Manholes formed at the center position on both left and right sides of the steel pipe, assembling materials such as various steel pipes and steel sheets in the boiler furnace F,
Various devices such as a hoisting device are carried in. Reference numeral 8 denotes a bulkhead type superheater element, and 9 denotes a plate type superheater element, which is suspended from the front end of the deflection arch 1 to an upper side thereof and in a rearward position near the deflection arch 1 in a parallel state. Supported. Furnace water pipes (not shown) are closely buried in all furnace walls in the upper furnace 4, the combustion furnace 6, and the furnace bottom 5, and a burner section (not shown) is provided in the furnace rear wall 2. ) Are arranged in tandem.

Reference numeral 10 denotes a suspension iron structure frame-structured behind the upper ceiling of the furnace ceiling wall 3, and 11 to 13 are through holes formed in the furnace ceiling wall 3, which are formed in the furnace ceiling wall 3 of the existing boiler furnace F. In the case of the LPG-fired boiler furnace F shown in FIG. 2, which is later drilled, the front penetration into the furnace ceiling wall 3 at the front half of the upper furnace 4 avoiding the mounting position of the superheater elements 8 and 9. Mouth 1
1 and an intermediate through-hole 12, and a rear through-hole 13 in the furnace ceiling wall 3 between the bulkhead superheater element 8 and the plate-type superheater element 9 in the rear half of the upper furnace 4.

Therefore, the configuration and the assembling procedure of the work stage according to the present invention will be described. Prior to that, first, in order to function as an assembling pedestal for the work stage in the present invention and as a dismantling pedestal after the work is completed, the furnace bottom stage in which the upper surface is horizontal at the furnace bottom 5 of the combustion furnace 6. Assemble D. In this method, various scaffolding materials such as steel pipes, steel bars, strips, mesh plates, etc. are carried into the furnace from manholes 7 located on both left and right sides of the furnace bottom 5, and as shown in the schematic diagram of FIG. After assembling and forming a bottom-like scaffold structure with the length of the legs of the steel pipe scaffold gradually increased / decreased along the gentle slope (the deepest part is about 4 to 5 meters), It is assembled by laying a net board or the like horizontally.

Then, at the first half position of the furnace bottom 5, various materials for constituting the work stage A are
Again, it is carried from the manhole 7 onto the furnace bottom stage D,
The front side work stage A is formed into a rectangular disk-shaped frame by using the loaded materials, and then a band plate is fixed on the upper surface of the work stage A, or a net plate is stretched, as shown in FIG. Then, the front-side work stage A is assembled and configured. The reason that the front side work stage A is assembled at a position near the front half of the furnace bottom stage D is that the superheater element 8 is located at the front half of the upper furnace 4 in the boiler furnace F of the present embodiment. , 9 are not configured and the furnace ceiling wall 3
This is because we paid attention to the fact that the space up to the space was a space.

The components for lifting the front-side work stage A are carried in from the manhole 7. First, four carried-in motor hoists 14 are moved to the work stage as shown in the upper left part of FIG. The work stage E is attached to the left and right corners at the rear end portion and four peripheral positions at the left and right sides near the front of the work stage E. Further, the upper end hook 16 of the wire rope 15, which is bent and inserted inside the hoisting machine 14, is inserted into the front through-hole 11 and the intermediate through-hole 12 in the furnace ceiling wall 3, and then, the inside of the furnace ceiling is opened. The front work stage A is hung on the suspension iron structure 10 so as to be able to be suspended as shown in FIG. In FIG. 3, reference numeral 17 denotes a hard rubber guide roller mounted on two sides of the furnace front wall 18 and one side wall 19 of the front work stage A, and is provided so as to be freely retractable by a coil spring or an air cylinder 20 or the like. As a result, the two sides of the front working stage A are prevented from directly contacting the reactor water pipe. Reference numeral 21 denotes a hanging hook attached to two sides of the furnace wall of the front work stage A, and the gondola G is hung from the front work stage A later.

Therefore, when the four motor-driven winders 14 in the front working stage A are operated synchronously, the individual winders 14 are moved up along the wire ropes 15 to thereby move upward. At the stage where the side work stage A has been pulled vertically upward by about several meters, it is held in a state of being temporarily stopped at a height position as shown in FIG.

Next, at the rear half position of the hearth stage D, that is, near the deflection arch 1 in the upper furnace 4, in the rear half of the boiler furnace F in which the superheater elements 8 and 9 are configured, The various materials for constituting the work stage B are again carried in from the manhole 7 onto the furnace bottom stage D, and the rear work stage B is formed into a rectangular plate-like frame by the carried materials. By fixing a band plate on the upper surface of the stage B or stretching a net plate, a rear working stage B is configured as shown in FIG.

Then, various materials for constructing the bellows frame J having a folding structure are carried in from the manhole 7, and the materials can be folded at the upper position near the front end of the rear working stage B by using the materials. 1 component of bellows frame J
The entire bellows frame J is formed continuously in the lateral width direction of the rear-side working stage B by assembling each stage and stacking it in a folded state in a large number of stages. As shown in FIG. 5, the bellows frame J is composed of a large number of pairs of folding legs 22 that are folded in a gate shape, and a cross beam 23 that keeps a space between the folding legs 22 in the lateral direction. A pair of adjacent left and right folding legs 22 is formed so as to be freely foldable in the middle of the bellows frame J at the left and right ends and the intermediate portion. The first-stage bellows frame J is formed, and is assembled by stacking and connecting the upper-side one after another in multiple stages. For details, see Japanese Unexamined Patent Publication No.
No. 7069 discloses a scaffold device.

Then, by operating the motor-equipped hoist 14 in the front work stage A in the reverse direction, the front work stage A is moved down along the wire rope 15, and as shown in FIG. The uppermost portion of the bellows frame J is connected and fixed to the front side work stage E after the rear bottom surface position of the front side work stage A is brought into contact with the upper end of the bellows frame J on the work stage B. Then, the hoisting machine 14 in the front side work stage A is rotated in the normal direction by one stage of the bellows frame J, and the work stage A is moved upward, whereby the folding legs 22 in the uppermost bellows frame J are moved. By crossing the pair of adjacent left and right folding legs 22 with the cross beam 24 as a brace, and fixing the upper and lower middle portions of the folding legs 22 so that they cannot be bent by locking means.
The uppermost bellows frame J is held in a vertically upright state. Again, the hoisting machine 14 is rotated forward by one stage of the bellows frame J at the next stage, and the front side working stage A is moved up by one stage, so that the second stage of the folding leg 22 is started up. A pair of adjacent left and right folding legs 22 are crossed again with the cross beam 24 as a brace, and the second-stage folding legs 22
Are connected and fixed by locking means. This work procedure is repeated by the number of steps of the bellows frame J, that is, the number of folding steps of the folding legs 22, so that the bellows frame J is obtained as shown in FIGS.
At the stage where all the stages of the hoisting machine have been started up vertically, the hoisting machine 14
The upward movement of the front work stage A due to the forward rotation operation is temporarily stopped.

On the other hand, as in the case of the front work stage A, components for lifting the work stage B are carried into the rear work stage B from the manhole 7 and, among them, the motor-equipped hoist 25-2. As shown in the lower right part of FIG. Further, the upper end hook 27 of the wire rope 26 passed through the hoist 25 is passed through the rear through-hole 13 in the furnace ceiling wall 3 and then hooked on the suspension iron structure 10 behind the furnace ceiling. The rear-side work stage B is hung up and down freely. In addition, hard rubber guide rollers 17 and the like, which are urged and supported so as to be freely retractable, are attached to two sides of the furnace rear wall 2 and the one side wall 19 of the rear working stage B. Further, hanging hooks 21 are attached to two sides of the furnace wall side of the rear working stage B.

Therefore, when a command to raise the work stages A and B is issued to the four winders 14 on the front work stage A and the two winders 25 on the rear work stage B, these are lifted. Winding machines 14, 25
Is a wire rope 1 that rotates forward in synchronization and hangs
5 and 26 are pulled down and discharged downward, thereby moving the entire work stages A and B vertically upward along the wire ropes 15 and 26, and finally, as shown in FIG. 1 and FIG. The front work stage A is lifted almost to the vicinity of the furnace ceiling wall 3, that is, while leaving a space about the height of the worker, and at the same time, the rear work stage B is lifted to the lower end of the deflection arch 1. Then, the lifting operation of the entire apparatus is stopped. At this time, the work stages A and B swing back and forth and right and left so as to contact the reactor water pipe on the inner wall of the furnace. However, the guide rollers 17 provided on the outer portions of the work stages A and B are buffered with the reactor water pipe. Move up and down while performing functions. After the entire work stages A and B have been pulled up to the ceiling of the boiler furnace F, suspension rods or flat bars (not shown) for fixing the lifted work stages A and B are inserted into the through holes 11 to 11.
13, and the lower end thereof is taken up by a winding machine 14,
The work stage A is fixed directly to the frames of the work stages A and B in the vicinity of 25, and the upper end thereof is fixed directly to the suspended steel 10, so that the front work stage A is mounted on the ceiling of the boiler furnace F and on the rear side. The work stage B is securely fixed at the part of the deflection arch 1.

Further, by the same assembly and construction procedure of the work stages A and B, the right half of the boiler furnace F is also provided.
A front work stage A and a rear work stage B, which are symmetrical to the left part, are formed in a stepped state via a bellows frame J and then lifted, and the front work stage A is moved to the right half. After lifting up to the vicinity of the furnace ceiling wall 3 and lifting the rear-side work stage B to the part of the deflection arch 1, these work stages A and B are lifted in the same manner as in the case of the left side part. Fix it immovably with a rod or flat bar. As shown in FIG. 1, two work stages A and B in a stepped state are arranged side-by-side symmetrically so that various maintenance, inspection and repair work can be performed safely. Is obtained. The through-holes 11 to 13 which are subsequently drilled in the furnace ceiling wall 3 are completely closed again after the end of the operation, or can be freely opened in order to eliminate the necessity of re-piercing at the next operation. It is closed in a state.

[0020]

[Modification] In the above case, the case where the front working stage A and the rear working stage B are assembled and formed in a stepped state by the bellows frame J has been described.
In the case of the coal-fired boiler furnace F shown in (1), a relatively wide space is formed between the partition type superheater element 8 and the plate type superheater element 9 arranged in the upper furnace 4, When the lower ends of the superheater elements 8 and 9 and the position of the deflection arch 1 are almost at the same height, the above-described construction moving method in the present embodiment is partially changed to cope with the problem. Will be. In this case, first, the front-side work stage A is assembled and formed at the front half position of the hearth stage D, and the rear-side work stage B is assembled and formed at the rear half position of the hearth stage D. Are connected and fixed, and as shown in FIG.
The folded bellows frame J is stacked on the upper front end of the rear working stage B in multiple stages. Next, after connecting a wire rope 28 hanging down from the intermediate through-hole 12 to the upper end of the bellows frame J, the wire rope 28 is wound up by a motor-equipped winder 29 attached to the upper end of the bellows frame J. Then, the bellows frame J is lifted one by one, and thereby the bellows frame J is raised in a vertical state as shown in FIG. Next, the lower end of the wire rope 30 hanging down from the front through-hole 11 is connected to a motor-equipped hoist 31 attached to the front end of the front work stage A, and the wire rope hanging down from the rear through-hole 13. The lower end portion of the motor 32 is connected to a motor-equipped hoist 33 attached to a substantially intermediate portion of the rear working stage B. Then, by winding these winding machines 29, 31, and 33 in synchronization with each other, the structure of the work stages A and B assembled in an inverted T-shape is lifted to the upper part of the boiler furnace F. As shown in FIG. 13, the bellows frame J is lifted between the partition-type superheater element 8 and the plate-type superheater element 9 in an upright state. After that, instead of the above-mentioned wire ropes 28, 30, 32, a suspension rod or a flat bar is attached to the suspension frame 10.
Work base for safely performing various maintenance, inspection, repair work, etc. by connecting and fixing between the upper stage of the bellows frame J and the front work stage A and the rear work stage B. Is obtained.

[0021]

According to the present invention, as described above,
The work stage is formed by a front work stage and a rear work stage, and of the work stage, an upper position near the inner end of the rear work stage and a bottom position near the inner end of the front work stage. In the meantime, a bellows frame in which folding legs are stacked in multiple stages in the width direction is interposed, and the bellows frame is folded or raised, and the front work stage and the rear work stage are stepped. The work stage inside the boiler furnace is provided, so that maintenance, inspection, repair work, etc. near the furnace ceiling wall of different heights and the deflection arch can be performed safely and stably. Work. In addition, the vertical bellows frame connecting the front side work stage and the rear side work stage up and down, and the scaffold frame extending over the superheater element as a fixed scaffold is extended to inspect the superheater elements between each other. And repair work is also possible. In addition, in terms of method, a front-side work stage is assembled and formed almost at the front half of the hearth stage, and the front-side work stage is temporarily lifted to an appropriate height position and stopped, and then substantially Assembling and forming the rear work stage in the latter half, and attaching the lower end of the bellows frame, which is a stack of multiple sets of folding legs and is foldably connected at the upper position near the inner end of the rear work stage, Once the suspended front-side work stage is suspended and lowered to the uppermost position of the bellows frame, the upper end of the bellows frame is connected and supported at a bottom position near the inner end of the front-side work stage. First, the front side work stage is lifted by one stage of the bellows frame, the folding legs in the uppermost bellows frame are raised, and the braces are connected to the adjacent folding legs, and then connected. The next work stage is lifted by one stage, the folding legs in the next stage bellows frame are raised, the braces are connected to the adjacent folding legs and connected, and this is repeated by the number of stages of the bellows frame. Since the whole was started up vertically, and then the entire front side work stage and the rear side work stage were synchronized, and a method of constructing and moving the work stage in the boiler furnace was provided so that the work stage was lifted above the furnace.
By making the furnace bottom stage at the furnace bottom a scaffold for assembling and disassembling the work stage, not only the assembling work but also the dismantling work can be performed quickly and safely. It can be significantly shortened. In addition, maintenance work inside the boiler furnace,
Inspection and repair work can be performed with security based on a safe and stable work stage, and various effects such as significantly improving work efficiency can be brought about.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a work stage suspended in an upper layer in a boiler furnace.

FIG. 2 is a cross-sectional view showing an overall outline of a boiler furnace.

FIG. 3 is a perspective view showing a state in which a front side work stage and a rear side work stage are stepped by a bellows frame;

FIG. 4 is a sectional view showing a furnace bottom stage.

FIG. 5 is a perspective view showing a partially folded state of the bellows frame.

FIG. 6 is a diagram showing a furnace bottom stage and a front working stage provided in a front half thereof.

FIG. 7 shows a state in which a front work stage once suspended, a rear work stage provided in the rear half of the hearth stage, and a bellows frame folded at the front end position of the rear work stage are stacked in multiple stages. FIG.

FIG. 8 is a diagram showing a state in which the front work stage is suspended and the upper end of the bellows frame is connected to the rear end position.

FIG. 9 is a view in which the entire front of the bellows frame is raised in a vertical state by lifting the front side work stage by the number of folding steps of the bellows frame, and the front side work stage and the rear side work stage are stepped. It is.

FIG. 10 is a view showing a state in which a front working stage is lifted up to a furnace ceiling, and a rear working stage is lifted up to near a deflection arch.

FIG. 11 is a view showing a state in which the front-side work stage and the rear-side work stage are connected, and a plurality of folded bellows frames are attached.

FIG. 12 is a diagram showing a state in which the entire bellows frame is raised in a vertical state by lifting the bellows frame by the number of folding steps.

FIG. 13 is a view showing a state in which the upper end of the bellows frame is lifted up to the furnace ceiling, and the work stage is lifted up to the vicinity of the deflection arch.

[Explanation of symbols]

 F Boiler furnace D Furnace bottom stage A Front work stage B Rear work stage J Bellows frame G Gondola 1 Deflection arch 2 Furnace back wall 3 Furnace ceiling wall 4 Upper furnace 5 Furnace bottom 6 Combustion furnace 7 Manhole 8, 9 Superheater element 10 Suspension frame 11-13 Through hole 14, 25 Motor winder 15, 26 Wire rope 16, 27 Upper hook 17 Guide roller 18 Furnace front wall 19 Furnace side wall 20 Air cylinder 21 Hook 22 Folding leg 23 Cross beam 24 Cross beams 28, 30, 32 Wire ropes 29, 31, 33 Winding machine with motor

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeki Fujimori 4-4-111 Nakatsu, Kita-ku, Osaka-shi Meiko Kinzoku Kogyo Co., Ltd. (72) Inventor Masahiro Kimura 4-4-1-11 Nakatsu, Kita-ku, Osaka-shi No. Meiko Metal Industry Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) E04G 1/36 F22B 37/02

Claims (3)

(57) [Claims] 1. A work stage is assembled and formed at the bottom of a boiler furnace, and the work stage is hung by a wire rope, and then the wire rope hoist is wound up or unwound, so that the inside of the boiler furnace is cooled. In the method of constructing and moving the work stage in the boiler furnace which is moved up and down, the front work stage is assembled and formed in almost the first half of the furnace bottom stage, and the front work stage is temporarily lifted to an appropriate height position. Stop, then assemble and form the rear working stage almost in the latter half of the hearth stage,
At the upper position near the inner end of the rear working stage,
After attaching a lower end of a bellows frame in which a large number of sets of folding legs are stacked and foldably connected, a suspended front working stage is suspended and lowered to the uppermost position of the bellows frame. The upper end of the frame is connected to the bottom position near the inner end of the front work stage, and then the front work stage is first lifted by one stage of the bellows frame,
After launching the folding legs in the uppermost bellows frame,
Connect the brace to the adjacent folding legs, and then
The front work stage is lifted up by one next stage, the folding legs in the bellows frame of the next stage are raised, the braces are connected to the adjacent folding legs and connected, and this is repeated by the number of stages of the bellows frame to repeat the bellows. Construction of a work stage in a boiler furnace, characterized in that the entire frame is started up vertically, and then the entire front work stage and rear work stage are synchronized and lifted to the upper part of the furnace. Moving method. 2. A work stage is assembled and formed at the bottom of the boiler furnace, and the work stage is suspended by a wire rope, and then the wire rope hoist is wound up or rewinded, so that the inside of the boiler furnace is cooled. In the method of constructing and moving the work stage in the boiler furnace which is moved up and down, the work stage for the front side is assembled and formed in almost the first half of the furnace bottom stage, and the rear work stage is assembled and formed in the substantially latter half of the furnace bottom stage. , The front work stage and the rear work stage are connected to each other in front and rear,
At the upper position of the connected work stage, the lower end of a bellows frame in which a large number of sets of folding legs are stacked in multiple stages and connected in a freely foldable manner is attached, and the uppermost folding legs in the bellows frame are raised and then adjacent to each other. By connecting the brace to the folding leg and connecting it, and then raising the folding leg in the next bellows frame, connecting the brace to the adjacent folding leg and connecting it, repeating this for the number of steps of the bellows frame The entire bellows frame is started up in a vertical state, and then the bellows frame, which has been started up in a vertical state, and the entire work stage for the front part and the work part for the rear part are synchronized, and are lifted to the upper part of the furnace. Characteristic method of constructing and moving a work stage in a boiler furnace. 3. A work stage formed in a boiler furnace,
By suspending the wire rope on a suspension frame at the furnace ceiling and hoisting or rewinding the wire rope hoist, the work stage is configured to move up and down in the boiler furnace. In the work stage, the work stage is formed of a front work stage and a rear work stage, of which an upper position near the inner end of the rear work stage and an inner position near the inner end of the front work stage. Between the lower stage and the lower stage, a bellows frame in which folding legs are stacked in multiple stages and connected to each other in the width direction of the work stage is interposed, and the bellows frame is folded or raised to start the front work stage. A work stage in the boiler furnace, wherein the work stage on the rear side is configured to be stepped.