JP4578453B2 - Chimney dismantling method - Google Patents

Description

  The present invention relates to a method for disassembling a chimney having an inner / outer double cylinder structure in which an inner cylinder is made of refractory brick and an outer cylinder is made of concrete.

  Conventionally, in a heating furnace or the like in which extremely high temperature exhaust gas is generated, a chimney having a double cylinder structure having excellent fire resistance and heat resistance of an outer cylinder made of reinforced concrete and an inner cylinder made of refractory brick as a chimney structure. It has been adopted. When this chimney is aged and dismantled, it is necessary to separate these dismantled pieces in order to reuse and recycle dismantled pieces of refractory bricks and concrete. When demolished at the same time, the concrete demolition pieces and the refractory brick demolition pieces are mixed, and separation requires a large amount of equipment and much labor.

Therefore, for example, as described in Patent Document 1, the inner cylinder dismantling means is lifted and inserted into the upper end opening of the chimney, and the inner cylinder dismantling means moves the fire brick inner cylinder from its upper end to its lower end. The dismantled piece is dropped to the lower end in the chimney, a dismantled piece discharge opening is provided at the lower end of the chimney, and the dismantled piece is excluded to the outside through this opening. When the dismantling of the refractory brick inner cylinder is completed, the outer cylinder disassembling means is then lifted, and the outer cylinder disassembling means disassembles the outer cylinder from the upper end to the lower end, and the dismantled piece is disassembled in the outer cylinder. And is discharged from the lower end of the outer cylinder to the outside through the dismantling piece discharge opening.
Japanese Patent No. 3548565

  However, according to the chimney dismantling method described in Patent Document 1, a relatively large dismantling piece discharge opening that can be scraped by a heavy machine is provided in advance at the lower end of the chimney when disassembling. As a result, the strength of the chimney is significantly reduced, and there is a risk that the chimney will collapse due to an earthquake or strong winds, resulting in poor safety. In particular, after dismantling the refractory brick inner cylinder over its entire length, when dismantling the concrete outer cylinder, the outer cylinder has become obsolete and brittle due to long-term use, so disassembly can be performed easily. However, if an opening for dismantling pieces is provided at the lower end as described above, there is a problem that rolls are generated by an earthquake or strong wind, and the risk of collapse increases.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a safe and efficient chimney composed of a double cylinder of a concrete outer cylinder and a refractory brick inner cylinder. The object is to provide a method for disassembling a chimney that can be dismantled while accurately separating it into concrete dismantling pieces and brick dismantling pieces.

  In order to achieve the above object, the chimney dismantling method of the present invention is a chimney dismantling method comprising a double cylinder of a concrete outer cylinder and a refractory brick inner cylinder as described in claim 1. The step of disassembling the refractory brick inner cylinder from the upper end to the lower end with the concrete outer cylinder remaining, and depositing the brick demolition pieces in the lower end of the undisassembled inner cylinder, and this deposit Placing the partition plate on the upper surface of the steel plate, and disassembling the concrete outer cylinder from the upper end to the lower portion after placing the partition plate, and removing the concrete demolition piece on the partition plate A step of depositing in the lower part of the cylinder, and an opening communicating from the outer peripheral surface of the lower end of the outer cylinder to the lower end of the inner cylinder, through which the brick demolition pieces accumulated from the lower end of the accumulation to the outside The removal process and the deposit Removing the deposit of concrete demolition pieces from the opening following the removal and removal of the partition plate, and removing the lower end of the inner cylinder and the lower part of the outer cylinder after removing the deposits of the concrete demolition pieces. It comprises the steps of dismantling and removing.

  In this chimney disassembling method, the invention according to claim 2 is that the inner cylinder of the refractory brick is formed such that its inner peripheral surface gradually increases in diameter from the upper end toward the lower end, while the partition plate has an outer diameter of the outer cylinder. The outer diameter is larger than the inner diameter of the lower end portion of the inner cylinder at the outer peripheral edge of the disk portion having a smaller diameter than the upper end opening portion of the cylinder and the outer peripheral edge of the disc portion, and through the cuts at small intervals in the circumferential direction. An elastic ring member divided into a plurality of elastic flexible pieces is attached, and the partition plate is suspended from the upper end opening of the outer cylinder, and the disk portion is placed on the upper surface of the deposit of the inner cylinder dismantling pieces. In addition, each elastic flexible piece of the elastic ring member is bent upward in contact with the inner peripheral surface of the undisassembled inner cylinder.

  According to the invention which concerns on Claim 1, when disassembling the chimney which consists of a double cylinder of a concrete outer cylinder and a refractory brick inner cylinder, the opening part for discharge | disassembly of a demolition piece is carried out at the lower end part of this chimney. Without disposing, the refractory brick inner cylinder is disassembled from the upper end to the lower end with the concrete outer cylinder remaining, so even if it is affected by earthquakes or strong winds during the dismantling process The lower end, which is the support base end of the chimney, is not provided with an opening for discharging a dismantling piece that reduces the strength, so that dismantling work can be performed while maintaining a predetermined strength and satisfying safety requirements. In addition, when the dismantled brick demolition pieces fall into the lower end of the chimney, scattering of dust and the like occurs, but the lower end of the chimney is surrounded by a peripheral wall surface over the entire circumference. Can be prevented from splashing outside, Can be securely deposited bricks dismantling pieces dismantled it is possible to perform the dismantling work while maintaining a good environment to the lower end portion.

  After disassembling the refractory brick inner cylinder until the bottom end having a capacity for depositing the brick demolition pieces is left, a partition plate is placed on the upper surface of the deposit. The upper cylinder is disassembled from the upper end to the lower part, and the concrete demolition pieces are deposited in the lower part of the undemolitioned outer cylinder on the partition plate. Thus, the brick demolition piece deposit and the concrete demolition piece deposit can be accumulated in a state of being accurately separated, and the strength of the lower end of the chimney is also reduced when the concrete outer cylinder is disassembled. Since there is no opening for discharging the dismantling piece that reduces the above, the outer cylinder maintains a predetermined strength, and the disassembling work can be performed relatively safely.

  Next, in the lower end portion of the chimney remaining in the undisassembled state, a dismantling piece discharge opening communicating from the outer peripheral surface of the lower end portion of the outer cylinder to the lower end portion of the inner cylinder is provided. Since the height of the chimney is low, it is possible to ensure safety even if an opening is provided. In this state, using heavy equipment, etc. It is possible to scrape concrete deposits sequentially and efficiently. At this time, when scraping the lower layer side of the brick demolition pieces through the openings, the brick demolition pieces deposits and the concrete demolition piece stacks stacked on the deposits via a partition plate are formed. The inside of the chimney lower end automatically descends according to the scraping amount, and the deposits of the brick demolition pieces and the concrete demolition pieces partitioned through the partition plate can be sequentially and smoothly removed. .

  Furthermore, after removing the deposit of the concrete demolition pieces, the step of disassembling and removing the lower end portion of the undisassembled inner cylinder and the step of disassembling and removing the lower part of the outer cylinder of the undeconstructed The lower part of the chimney that has not been demolished can be disassembled separately into brick demolition pieces and concrete demolition pieces in the same way as above, and these demolition pieces can be reused and recycled without the need for separation work. Can be achieved.

  Further, according to the invention according to claim 2, the inner cylinder of the refractory brick is formed such that its inner peripheral surface gradually increases in diameter from the upper end toward the lower end, while the partition plate has an outer diameter of the outer diameter. The outer peripheral edge of the disk part is smaller in diameter than the upper end opening of the inner part, and the outer diameter is larger than the inner diameter of the lower end part of the inner cylinder, and a plurality of gaps are provided at intervals in the circumferential direction. Since the elastic ring member divided into the elastic flexible pieces is attached, the length of the inner cylinder made of refractory bricks reaching from the upper end to the lower end is disassembled, and the brick dismantled piece is removed from the chimney. After being deposited in the lower end portion, the partition plate can be easily suspended through the upper end opening of the concrete outer cylinder, and the disc portion is laid on the brick demolition piece deposit and the disc portion The elastic ring member provided on the peripheral edge of the Therefore, it is possible to prevent the concrete demolition pieces deposited on the partition plate from being mixed into the brick demolition pieces below the partition plate. The debris can be reliably separated from the deposit, and when the brick demolition piece is removed, the partition plate descends integrally with the deposit according to the removal, and the inner diameter of the undisassembled inner cylinder is reduced according to the removal. The diameter gradually increases, but the elastic ring member of the partition plate is kept elastically in close contact with the inner peripheral surface of the inner cylinder while expanding downward according to the expansion of the inner diameter of the inner cylinder. It can prevent reliably that a piece mixes in a brick demolition piece.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal front view of a chimney A to be disassembled, and the chimney A is an inner cylinder 1 made of refractory bricks formed by stacking refractory bricks. The outer periphery of the refractory brick inner cylinder 1 has a double cylinder structure with a concrete outer cylinder 2 that covers the entire length of the inner cylinder 1 in order to further improve fire resistance and heat resistance. A gap 3 is provided over the entire length between the surface and the inner peripheral surface of the concrete outer cylinder 2. Further, the inner and outer cylinders 1 and 2 are formed so that the inner and outer diameters gradually increase from the upper end toward the lower end. The concrete outer cylinder 2 may be made of reinforced concrete or unreinforced concrete.

  When this chimney A is aged and dismantled, in order to recycle the brick dismantling piece 1a obtained by dismantling the inner cylinder 1 and the concrete dismantling piece 2a obtained by dismantling the outer cylinder 2, It is desirable to disassemble the piece 1a and the concrete demolition piece 2a so that they are separated without mixing, and the disassembly work needs to be performed safely without reducing the strength of the chimney A. is there.

  Therefore, in the present invention, first, the inner cylinder 1 made of refractory bricks is disassembled from the upper end toward the lower end so that the lower end remains for a predetermined length as shown in FIG. The piece 1a is deposited in the undisassembled inner cylinder lower end portion 1 ', and then the partition plate 4 is placed on the deposit of the brick demolition pieces 1a as shown in FIG. As shown in FIG. 12, the concrete dismantled piece 2a is disassembled from the upper end until it reaches the lower part so that the lower part remains for a predetermined length, and the partition in the lower part 2 'of the undisassembled part of the outer cylinder 2 It is dropped into the upper end portion on the plate 4 and deposited on the partition plate 4.

  The disassembly work of the inner cylinder 1 and the outer cylinder 2 is performed by the peripheral wall surface between the inner cylinder 1 and the outer cylinder 2 without providing the opening for discharging the dismantling piece at the lower end of the chimney A. When the opening is provided in advance in the wall of the lower end of the chimney A, the lower end of the chimney is sealed with a concrete wall by placing concrete or the like. The chimney A is improved so as to maintain a strength that does not easily collapse due to an earthquake or strong wind. In addition, as a method of reinforcing the opening, the opening may be sealed with a steel frame or the like in which a plate material is stretched in addition to the formation of the concrete wall.

  As described above, the pile of brick demolition pieces 1a is placed in the lower half of the undisassembled lower part A1 of the chimney A after demolition, and the deposit of concrete demolition pieces 2a is placed on the upper half side via the partition plate 4. After the storage state, as shown in FIG. 13, a dismantling piece discharge opening 5 is provided on the peripheral wall of the lower end portion of the lower part A1 so as to communicate from the outer peripheral surface of the lower end portion of the outer cylinder 2 into the lower end portion of the inner cylinder 1. The brick demolition piece 1a is scraped through the opening 5, and then the partition plate 3 is removed, and then the concrete demolition piece 2a is scraped, and the brick demolition piece 1a and the concrete demolition piece 2a are reused separately as materials. It is.

  Further, the undemolition chimney lower part A1 emptied due to the removal of the deposits of the brick demolition piece 1a and the concrete demolition piece 2a is disassembled in the same manner as described above, and the lower end portion of the undemolition inner cylinder is dismantled. 5, the lower part of the undisassembled outer cylinder 2 may be disassembled and removed, or first, the lower part of the undisassembled inner cylinder is first removed by using a heavy machine or the like. It may be disassembled from its surroundings so that it remains, and then the undisassembled inner cylinder lower end may be disassembled.

  The dismantling method of the chimney A will be described in more detail. As the dismantling means 10 for disassembling the refractory brick inner cylinder 1 in the chimney A, for example, an apparatus described in JP-A-2005-265338 may be used. it can. As shown in FIG. 2, the disassembling means 10 includes a pair of wedges 13 and 13 having tapered lower ends on both sides of the lower end of a support 11 that can be inserted into the inner cylinder 1 in a suspended state. The upper ends of the wedge arms 12 and 12 are pivotally mounted so that the wedge arms 12 and 12 can be opened and closed in the radial direction by operation of a jack or the like. The upper ends of a pair of tooth arms 14 and 14 are formed on the lower side of the pair of teeth arms 14 and 14, which form blade portions 15 and 15 that impactably break the joint portion of the fire-resistant brick inner cylinder 1 from the inside at the lower end. These tooth arms 14 and 14 are configured to be opened and closed in the radial direction by operating a jack or the like.

  The dismantling means 10 constructed in this manner is suspended by a crane (not shown) and suspended from the top of the chimney A in the chimney A as shown in FIGS. Dismantling from the upper end to the lower end. In this disassembling method, first, a pair of wedge arms 12 and 12 are opened in the radial direction, and the wedge portions 13 and 13 are positioned above the gap 3 between the inner cylinder 1 and the outer cylinder 2, and then the disassembling means 10 is moved. The wedge parts 13 and 13 are inserted into the gap 3 by lowering. Next, the pair of sheath arms 14 and 14 are opened in the radial direction by jacks, and the blade portions 15 and 15 are brought into impact contact with the inner peripheral surface of the inner cylinder 1 to break the joints of the refractory bricks at the portions. After that, the pair of sheath arms 14 and 14 are returned to the original closed position.

  After that, the disassembling means 10 is further lowered and its weight is applied to the wedge parts 13, 13 so that the inner cylinder 1 made of refractory bricks is pressed in the inner diameter direction and the wedge arms 12, 12 are closed in a direction to be closed with a jack. By moving, the upper end portion of the refractory brick inner cylinder 1 is disassembled inward from the fractured portion without disassembling the outer cylinder 2, and the brick demolition piece 1a is dropped inside the chimney A so that the inside of the chimney A Housed in the bottom end of the tube. Similarly, the dismantling means 10 disassembles the refractory brick inner cylinder 1 toward the lower end portion, and deposits the dismantled brick dismantling pieces 1 a in the lower end portion of the inner cylinder 1.

  As shown in FIG. 4, the dismantling means 10 dismantles the fire-resistant brick inner cylinder 1 until the lower end portion 1 ′ having an inner volume corresponding to the volume of the brick demolition pieces 1a remains. Is performed from the upper end to the lower end 1 ′, and then the dismantling means 10 is removed.

  Next, the partition plate 4 is suspended in the outer cylinder 2 using a crane from the upper end of the outer cylinder 2 to be next disassembled, and as shown in FIG. It is placed on the pile of brick demolition pieces 1a deposited on.

  As shown in FIGS. 6 to 8, the partition plate 4 has a disk portion 4a made of an iron plate whose outer diameter is smaller than the inner diameter of the upper end opening of the outer cylinder 2, and an inner peripheral edge of the disk portion 4a. An annular elastic ring member 4b having a peripheral edge fixed integrally and having an outer diameter larger than the inner diameter of the lower end of the undisassembled portion of the inner cylinder 1 is formed around the elastic ring member 4b. A cut 4c cut from the outer peripheral edge of the elastic ring member 4b toward the outer peripheral edge of the disc portion 4a is provided at small intervals in the direction and divided into a plurality of elastic flexible pieces 4b 'through the cut 4c. It has the structure. In the figure, 4d is a bolt in which the inner peripheral edge of the elastic ring member 4b is fixed to the disc portion 4a via a holding ring 4e, and 4f is a suspension projecting from the outer peripheral four sides on the upper surface of the disc portion 4a. It is a hook locking metal fitting.

  When the hooks of the crane are locked to the four locking metal fittings 4f of the partition plate 4 and the partition plate 4 is held in a horizontal state and inserted into the upper end opening of the outer cylinder 2, all the elastic ring members 4b After the lower surface of the elastic flexible piece 4b ′ is in contact with the upper end surface of the outer cylinder 2, the elastic flexible piece 4b ′ is bent upward while sliding on the inner peripheral surface of the outer cylinder 2, and in this state, The inside of the outer cylinder 2 is suspended and inserted into the upper end opening of the undisassembled lower end 1 ′ of the inner cylinder 1, and the elastic flexible piece 4b ′ of the elastic ring member 4b bent upward is the inner circumference of the opening end. The disc part 4a is placed on the upper surface of the deposit of the brick dismantling pieces 1a in a state of being pressed against the surface. The inner cylinder 1 and the outer cylinder 2 are formed so that the inner diameter gradually increases from the upper end toward the lower end, but they are slidably contacted with the inner peripheral surface of the outer cylinder 2 in an upwardly bent state. The elastic ring member 4b of the partition plate 4 is kept elastically in close contact with the inner peripheral surface of the outer cylinder 2 while being elastically deformed in the direction of deployment as it descends, and remains in the undisassembled inner cylinder lower end 1 '. If it is accepted, the state is maintained.

  Next, as shown in FIG. 9, the disassembly work from the upper end of the outer cylinder 2 toward the lower part by the dismantling means 20 of the concrete outer cylinder 2 is started. As the disassembling means 20, for example, as shown in FIG. 10, a facility-mounted horizontal base 21 suspended by a crane, a turning frame 22 mounted on the lower surface of the horizontal base 21, and a suspension support Attached to a pair of sandwiching arms 23 and 24 for gripping the concrete outer cylinder 2 from the inner and outer peripheral surfaces of the outer cylinder 2 and one sandwiching arm 23 for pressing the outer peripheral surface of the outer cylinder 2 Then, a device constituted by a striking device 25 composed of a breaker having a chisel 26 at the tip for crushing the outer cylinder outer peripheral surface portion in the lower vicinity of the pinching arm 23 is used. When the outer cylinder 2 is made of reinforced concrete, a reinforcing bar cutting blade (not shown) for cutting the reinforcing bars may be provided on the opposing surfaces of the pair of sandwiching arms 23 and 24.

  Further, an engine, a hydraulic pump, a hydraulic motor, an oil tank, a generator, a radio operation control unit for operating the swivel frame 22, the pair of clamping arms 23, 24, the striking means 25, etc. Etc. are installed.

  The disassembling means 20 constructed in this manner is suspended by a crane (not shown) and, as shown in FIG. 9, the upper end portion of the outer tube 2 in the chimney A in which the inner tube 1 is disassembled to its lower end portion 1 ′. Is clamped by a pair of clamping arms 23 and 24, the impact device 25 is operated in this state, and the tip chisel 26 is pressed against the outer peripheral surface of the upper end portion of the outer cylinder 2 while generating cracks. The lower portion of the concrete portion sandwiched between the sandwiching arms 23 and 24 is destroyed by biting in toward the surface. The destroyed concrete demolition piece 2a is in a state of being clamped by the pinching arms 23 and 24. The concrete demolition piece 2a is dropped by moving the pinching arms 23 and 24 into the outer cylinder 2 and releasing the pinching. And accommodated on the partition plate 4.

  In addition, when the concrete outer cylinder 2 is aging and fragile, the pair of pressing arms 23 and 24 holding the concrete portion to be crushed are placed inside the outer cylinder 2 without the need for the impact device 25. By increasing the clamping pressure while moving, the upper end of the sandwiched concrete outer cylinder 2 can be crushed so as to be bent inward.

  With this disassembling means 20, the concrete outer cylinder 2 is disassembled from the upper end to the lower part, and as shown in FIG. 11, the dismantled concrete dismantling piece 2a is deposited in the undisassembled inner cylinder lower end 1 '. It is deposited on the partition plate 3 laid on the brick demolition piece 1a. At this time, since the partition plate 3 has the elastic ring member 4b on the outer periphery thereof in close contact with the inner peripheral surface of the open end of the undisassembled inner cylinder 1, the concrete dismantling piece 2a is on the brick dismantling piece 1a side. It can be reliably deposited on the partition plate 3 without being mixed in.

  In the dismantling operation of the concrete outer cylinder 2 by the disassembling means 20, as shown in FIG. 12, the lower part 2 ′ of the outer cylinder 2 having an internal volume corresponding to the volume of the concrete dismantling piece 2a deposited on the partition plate 4 remains. The process is performed until the state is reached, and then the dismantling means 20 is removed.

  In this way, the brick demolition piece 1a is deposited in the lower end portion 1 ′ of the undisassembled inner cylinder 1, and the concrete demolition piece 2a is placed in the undisassembled outer cylinder lower portion 2 ′ on the partition plate 4 placed on the deposit. After the state is accumulated, a dismantling piece discharge opening 5 (shown in FIG. 13) communicating from the outer peripheral surface of the lower end portion of the outer cylinder lower portion 2 ′ to the lower end portion of the inner cylinder lower end portion 1 ′ is drilled. . In this case, since the height of the chimney lower part A1 composed of the undisassembled inner and outer cylinder parts 1 ′ and 2 ′ is low, there is almost no possibility of falling down by strong winds or the like even if the opening part 5 is provided. It can be secured.

  In this state, the scraps of the brick demolition pieces 1a in the lower end 1 'of the inner cylinder are scraped out from the lower layer side to the outside by an appropriate scraping means such as a heavy machine. At this time, as the brick demolition piece 1a is discharged from the opening 5, the deposit of the concrete demolition piece 2a on the partition plate 3 protrudes upward from the undisassembled inner cylinder lower end 1 'by its weight. The lower part 2 ′ of the outer cylinder descends toward the lower end part 1 ′ of the inner cylinder. At this time, the partition plate 4 also integrally moves toward the lower end side of the inner cylinder lower end portion 1 ′ while sliding the elastic ring member 4b upwardly on the inner peripheral surface of the inner cylinder lower end portion 1 ′. Descent.

  When all the deposits of the brick demolition pieces 1a in the undisassembled inner cylinder lower end portion 1 ′ are removed, the partition plate 3 reaches the lower end of the opening portion 5, and the partition plate 3 is moved from the opening portion 5 to the outside. After the removal, the deposit of the concrete demolition piece 2a is scraped and removed from the opening 5 by scraping means such as a heavy machine in the same manner as described above. Thus, after separately removing the brick demolition piece 1a and the concrete demolition piece 2a accumulated in the undemolition chimney lower part A1, as shown in FIG. 14, the empty chimney lower part A1 is configured. The undisassembled inner cylinder lower end 1 ′ and the outer cylinder lower part 2 ′ are disassembled separately.

  As the dismantling method, first, using the inner cylinder disassembling means 10, the undisassembled inner cylinder lower end portion 1 ′ is disassembled from the upper end toward the lower end, and the brick dismantling piece 1a is externally exposed from the opening 5. Then, the outer cylinder lower part 2 ′ may be disassembled using the outer cylinder disassembling means 20, and the outer cylinder disassembling means 20 may be used to project from the undisassembled inner cylinder lower end 1 ′. After disassembling the upper half of the undisassembled outer cylinder lower part 2 ', the lower half is disassembled using a heavy machine for dismantling, etc., and then the undisassembled inner cylinder lower end 1' is disassembled Etc. may be used for dismantling.

The simplified longitudinal front view of the chimney. The simplified front view of the dismantling means of the firebrick inner cylinder. The simplified vertical front view of the state which has disassembled the firebrick inner cylinder. The simple vertical front view of the state which disassembled the firebrick inner cylinder to the lower end part. The simplified vertical front view of the state which has arrange | positioned the partition plate. The perspective view of a partition plate. The plan view. The front view. The simplified longitudinal front view which shows the dismantling start state of a concrete outer cylinder. The simplified front view of the dismantling means of a concrete outer cylinder. The simplified longitudinal front view of the state which has dismantled the concrete outer cylinder. The simplified vertical front view of the state which disassembled the concrete outer cylinder to the lower part. The simple longitudinal front view of the state which is discharging the brick demolition piece. The simplified longitudinal front view of the lower part of the chimney of the state which excluded all the deposits.

Explanation of symbols

A Chimney 1 Refractory brick inner cylinder
1a brick demolition piece
1 'Lower end of undisassembled inner cylinder 2 Concrete outer cylinder
2a Concrete demolition piece
2 'lower part of undisassembled outer cylinder 3 gap 4 partition plate 5 opening for dismantling piece discharge
10 Inner cylinder disassembly means
20 Outer cylinder disassembly means

Claims (2)

  A method of disassembling a chimney consisting of a double cylinder consisting of a concrete outer cylinder and a refractory brick inner cylinder, with the concrete outer cylinder remaining, leaving the refractory brick inner cylinder from the upper end to the lower end. Disassembling and depositing the brick dismantling pieces in the lower end of the undisassembled inner cylinder, placing the partition plate on the top surface of the deposit, and placing the partition plate on the concrete after the partition plate is placed And disassembling the concrete from the upper end to the lower part, and depositing the concrete demolition pieces in the lower part of the undisassembled outer cylinder on the partition plate, and communicating from the outer peripheral surface of the lower end of the outer cylinder into the lower end of the inner cylinder The step of removing the deposit of the brick demolition pieces from the lower end side of the deposition through the opening, and the removal of the deposit and the removal of the partition plate are followed by the opening of the concrete demolition pieces through the opening. Deposits outside Process and, disassembling method chimney, characterized in that it consists an inner cylinder lower end of the non-dismantled after removal of the deposits of the concrete demolition piece outer cylinder disassembled and lower, and removing to remove.   While the inner cylinder made of refractory bricks has its inner peripheral surface gradually formed with a larger diameter from the upper end toward the lower end, the partition plate has a disk portion whose outer diameter is smaller than the upper end opening of the outer cylinder. An elastic ring member whose outer diameter is larger than the inner diameter of the lower end portion of the inner cylinder at the outer peripheral edge of the disc portion and is divided into a plurality of elastic flexible pieces via a cut in the circumferential direction at small intervals. The partition plate is suspended from the upper end opening of the outer cylinder, and the disk portion is placed on the upper surface of the deposit of the inner cylinder dismantling pieces, and each elastic flexible piece of the elastic ring member is undisassembled. The chimney disassembly method according to claim 1, wherein the chimney is bent upward in contact with the inner peripheral surface of the inner cylinder.

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