JP2948433B2 - Dismantling method of steel freestanding chimney - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of dismantling a steel freestanding chimney.

[0002]

2. Description of the Related Art Conventionally, as a method for dismantling a steel freestanding chimney, the methods shown in FIGS. 11 to 16 are known. FIG.
16, 01 is a hook of a crane, 02 is a hanging beam supported by the hook of the crane, 03 and 04 are wires, and 05 and 06 are two large and small ring types suspended on the hanging beams by wires 03 and 04. Scaffold, 07: chimney to be dismantled, 08: eye plate attached to the outer surface of chimney 07, 09: eye plate 09 and ring type scaffold 0
5 is a hanging wire with a clip for connecting 5 and 010 is a chimney 07
A hanging wire with a clip, which connects the upper end portion and the hanging beam 02, is a horizontal cutting line for performing so-called width cutting for cutting the chimney 07 into two rows with a fixed width in a circle.

In this method, first, as shown in FIG.
With the crane hook 01, the wire 0
Ring-type scaffold suspended via 3,04
6 is lowered onto chimney 07. Next, as shown in FIG. 13, with the suspension beam 02 suspended near the upper end of the chimney 07, the worker 014 gets on the scaffold 05 by the ladder 013, and on the scaffold 05, the eye plate is placed on the outer peripheral surface of the chimney 07. 08 is welded. Then, the worker 014 stretches and connects the wire 09 with a clip between the eye plate 08 and the scaffold 05, and further moves onto the upper scaffold 06 to move the chimney 0.
7. A hanging wire with clip 010 is stretched and connected between the upper end portion 7 and the hanging beam 02.

[0004] Subsequently, as shown in FIG.
14 is moved onto the scaffold 05, the suspension beam 02 is slightly lowered, and the scaffold 05 is moved to the chimney 07 with the wire 09 and the eye plate 08.
, The lower end of the slack wire 03 is removed from the scaffold 05, and the scaffold 05 is fixed to the outer wall of the chimney 07 with a wedge or the like,
While applying the load of the chimney to the suspension beam 02, the horizontal cutting line 0
Slice the chimney along 11 Then, as shown in FIG. 15, the cut cylindrical block 07 'is
With 2 and small scaffold 06, it is lifted by a crane and lowered to the ground. On the other hand, worker 01 remaining on scaffold 05
4 either remains or descends to the ground through ladder 013.

[0005] Further, as shown in FIG.
Is returned by the crane onto chimney 07 in an empty state,
The worker 014 gets on the scaffold 05 again, and
2 is connected to the scaffold 05, and the suspension beam 02 is slightly
, The end of the hanging wire 09 with the clip is removed from the eye plate 08, the hanging beam 02 is wound up, and as shown in FIG. 13 again, the operation returns to the operation of attaching the stack to the upper end of the chimney 07. Proceed to.

[0006]

In the above-mentioned conventional method, as shown in FIG. 13, an operator 014 moves from a ladder 013 to a scaffold 05, and attaches an eye plate 08 and a hanging wire 09 with a clip. The work of connecting the hanging wire with clip 010 on the upper scaffold 06 is an unstable work on the swinging scaffolds 05 and 06.

[0007] In addition, the transfer to the scaffold 05 in FIG.
It is an unstable work in and is dangerous. Further, it is difficult to perform the work promptly, and it is inevitable that the construction period is prolonged. The present invention has been made in view of the above-described conventional technology, and has as its object to provide a disassembly method capable of reducing the risk of disassembly work at a high place and facilitating the work.

[0008]

According to the structure of the present invention to achieve the above object, a closed annular outer frame scaffold on which an operator rides is detachably mounted on the upper end of the chimney by a crane, and the chimney is cut horizontally. A plurality of hook hooking openings are cut in the circumferential direction below the line, and hooks are engaged with the openings via hook rods with turnbuckles at a plurality of lower portions of the outer frame scaffold, and the crane slinging is performed. The chimney cylinder body was cut off by cutting the upper end of the chimney along the horizontal cutting line while changing the wire from the outer frame scaffold to the upper part of the chimney and receiving the weight of the chimney cutting part by the crane via the slinging wire. The process is characterized by repeating the step of lifting the outer frame scaffold that the worker has left together with the block with a crane and lowering it on the ground.

[0009]

[Function] The outer frame scaffold has a ceiling surface and a peripheral wall formed by a framework, and is a closed annular shape that is opened inward. When the suspension beam, which is the ceiling surface, is mounted in contact with the horizontal upper end surface of the chimney. It is stable enough to transfer workers. Immediately in this state, the outer frame scaffold is tightly fixed to the chimney wall surface by a vertically moving wedge means or the like, so that swing can be prevented. Open a hook hooking opening on the chimney wall on the fixed outer frame scaffold, and hook the hook side of the hook rod with turnbuckle with one end connected to the lower portion of the outer frame scaffold on the lower edge of the opening to engage. I do.

[0010] The connection of the lower end of the slinging wire of the crane is transferred from the ceiling of the outer frame scaffold to the top of the chimney. These operations can be performed without danger on a fixed outer frame scaffold. Next, when the chimney cutting section is cut along the horizontal cutting line while the load of the cylinder block serving as the chimney cutting section is applied to the sling wire, the impact due to the slight drop of the cut cylinder block is also significantly reduced. I do. By covering the ceiling and outer peripheral surface of the outer frame scaffold with a thin plate or the like, it is less susceptible to the effects of wind and rain, and can also prevent falling objects from jumping out.
The hook rod with turnbuckle automatically separates from the chimney wall when the crane outer frame scaffold is lifted, such as by holding a rope from the rear wall.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. 1 to 4 are overall views schematically showing one embodiment of the present invention. As shown in the figure,
The steel free-standing chimney 1 to be dismantled is provided with two horizontal cutting lines 12 to be width-cut, and when the width is cut along this horizontal cutting line 12, the upper part is cut off as a cylindrical block 1a. It is. Further, on the outer wall surface of the independent chimney 1, a plurality of, for example, eight pieces are provided in the circumferential direction below the horizontal cutting line 12 by an operator who has boarded the closed annular outer frame scaffold 2 mounted on the independent chimney 1. The opening 8 for hooking is cut.

At the upper end of the self-standing chimney 1, a covered annular outer frame scaffold 2 is detachably mounted. Outer frame scaffold 2
A large-sized hydraulic crane 3 that is constructed on the ceiling surface and the outer peripheral surface, is open toward the inside, and is installed on the ground.
And lifted up and down from the ground to the top of the chimney. When the height of the chimney 1 is large and the lift of the hydraulic crane 3 is not enough, a tower crane or the like that erects a support beam by passing the support beam to the chimney 1 can be used.

The outer frame scaffold 2 has upper and lower two-stage scaffold floors 7a and 7b opened inside, and is suspended from the guide 8 engaging with the upper end of the chimney 1 on the ceiling surface and the slinging wire 6 of the crane 1. A suspension beam 2a is provided. Outer frame scaffold 2
A hook rod 14 with a turn buckle is attached between the scaffold floor 7a and the opening 8 for hooking in order to suspend the cradle from the chimney 1. One end of the hook rod 14 with the turnbuckle is pivotally attached to the corner of the scaffold floor 7a, and the other end hook is hooked on the lower edge of the hook opening 8.

The outer frame scaffold 2 has a guide roller 9 in contact with the chimney outer peripheral surface, and a wedge 11 inserted and removed by a screw cylinder 10 between the scaffold floor 7a and the chimney outer peripheral surface.
Etc. are provided. Further, equipment (not shown) for cutting the steel wall of the chimney 1 and cutting the circumferential lining is mounted on the outer frame scaffold 2. Accordingly, when the lower end of the slinging wire 6 of the crane 3 is detached from the suspension beam 2a of the outer frame scaffold 2 and is attached to the upper end of the chimney 1 through the space between the suspension beams 2a, the cylindrical block 1a and the outer frame scaffold 2 are joined together. Can be lifted and lowered to the ground.

As the outer frame scaffold 2, scaffolds having different inner diameters for the upper half or lower half of the chimney can be used, or the inner diameter can be made variable. Except for necessary parts, the ceiling surface and the outer peripheral surface of the outer frame scaffold 2 can be shielded by a plate or the like.

Next, the disassembling method of the present invention will be described in the order of steps with reference to FIGS. First, as shown in FIG. 5, the closed framed outer frame scaffold 2 is lowered by being positioned on the chimney 1 by the crane 3 via the slinging wire 6, and as shown in FIG. Ceiling suspension beam 2
a so as to contact the upper end of the chimney 1. Then, the worker 15 gets into the outer frame scaffold 2 from the ladder 16 on the outer wall of the chimney 1. The outer frame scaffold 2 is balanced by its own weight on the chimney 1 under the guidance of the guide 8 and the guide roller 9, and in this state, sufficient stability is maintained when the worker 15 enters and leaves.

Next, as shown in FIG. 6, the worker 15 who got on the outer frame scaffold 2 inserts the wedge 11 between the scaffold floor 7a and the outer wall surface of the chimney 1 by operating the screw cylinder 10. Tighten and fix the outer frame scaffold 2 to the chimney 1 at the lower end. Thereafter, the worker 15 transfers to the upper scaffold floor 7b, and moves the crane slinging wire 6 from the outer frame scaffold 2 to the chimney 1
Change to several places at the top. Then, the user moves onto the lower scaffold floor 7a, cuts a plurality of hook hooking openings 13 below the two horizontal cutting lines 12 above and below the chimney 1, and turns between the hook hooking openings 13 and the lower scaffold floor 7a. Attach hook rods 14 with buckles.

As shown in FIG. 9, the hooking opening 13 is cut in contact with the upper edge of the lower horizontal cutting line 12.
The hook rod 14 with the turn buckle is, for example, as shown in FIG.
As shown at 0, the hook 14a is connected to the lower floor 7a side by a horizontal axis, and the hook 14a is hooked on the lower edge of the opening 13 and attached. Preferably, a rope 1 connected to the rear wall side
By 4b, the posture of the rod portion 14c is maintained.

Further, the cylindrical block 1a is attached to the slinging wire 6.
The width cutting is performed along the horizontal cutting line 12 of the chimney 1 with a load of, for example, about 70% of the weight of the chimney 1. As shown in FIG. 9, the width cutting is performed by cutting the upper and lower horizontal cutting lines 12 except for the opening 13 at equal intervals of about 30%, and then using the crane 3 and the slinging wire 6 to cut the cylindrical block 1a. The entire cutting is performed while supporting a load of about 70% of the above. When the steel wall of the chimney 1 and then the inner lining are cut by the width cutting, the entire weight of the cylindrical block 1a is applied to the slinging wire 6 and a slight drop occurs, but the outer frame scaffold 2 has a plurality of hook rods. Stability is maintained by tightening of the wedge 11 and 14. For this reason, all operations on the outer frame scaffold 2 can be performed safely without shaking of the scaffold.

Subsequently, the worker 15 pulls out the wedge 11 and then leaves the outer frame scaffold 2 via the ladder 16 as shown in FIG. Then, as shown in FIG. 8, the crane 3 is hoisted, lifted together with the outer frame scaffold 2 placed on the cylindrical block 1a, and lowered to the ground as shown in FIG. On the ground, the slinging wire 6 is replaced from the cylindrical block 1a to the outer frame scaffold 2 to complete one cycle of the dismantling process, and the outer frame scaffold 2 is repeatedly mounted on the chimney 1 as shown in FIG. Then, the chimney 1 is dismantled in the manner described above.

As described above, in the disassembly method of the present invention, since the closed annular outer frame scaffold 2 is detachably mounted on the upper end of the chimney 1, it is easy to secure the stability of the scaffold with respect to the chimney 1. Significant improvement. In addition, getting on and off the scaffold, and dismantling the chimney on the scaffold can be performed safely and efficiently without raising or lowering or swinging the scaffold. Furthermore, outer frame scaffold 2
Opening 13 with support for lower chimney wall cut into chimney
And the hook rod 14 with a turn buckle hooked to the edge of the opening 13, so that the hook rod can be easily attached, and the removal can be automatically performed on the winding of the outer frame scaffold 2, thereby being simplified. . Moreover, when the outer frame scaffold 2 is shielded, the work can be performed without being affected by the weather. Thus, the dismantling method of the present invention makes the whole operation safe and easy, and the chimney dismantling can be advanced without any loss time.

Incidentally, the outer frame scaffold, the hook rod with the turnbuckle, and other equipment used in the present invention are not limited to the above-described embodiment, but can be used by appropriately changing the design.

[0023]

As described above in detail with reference to the embodiments, according to the present invention, a closed annular outer frame scaffold is mounted on a freestanding chimney to be dismantled by a crane, and the outer frame scaffold is mounted on the outer frame scaffold. Allow the operator to step in and cut a plurality of openings in the circumferential direction below the horizontal cutting line of the chimney, hook the lower part of the outer frame scaffold via the hook rod with turn buckle and support it, The chimney is cut to width along the horizontal cutting line while the weight of the cylinder block above the chimney is received by the crane, and after the worker leaves, the crane is removed from the cylinder block by the crane. By repeating the process of lifting the frame scaffold together and suspending it on the ground, the stability of the scaffold on the chimney has been improved, and the scaffold can be fixed and opened easily and easily. In addition, the safety of the work is enhanced, the effects of the wind and rain are prevented, the time loss is eliminated, and the work is facilitated.

[Brief description of the drawings]

FIG. 1 is an overall view schematically showing an embodiment of a disassembly method of the present invention.

FIG. 2 is an enlarged explanatory view of a part II in FIG.

FIG. 3 is an enlarged explanatory view of a configuration example of a part III in FIG. 2;

FIG. 4 is a perspective view showing a state in which an outer frame scaffold and a cylindrical block are suspended.

FIG. 5 is a side view showing the operation status of the disassembly method of the present invention in the order of steps.

FIG. 6 is a side view showing the operation status of the disassembly method of the present invention in the order of steps.

FIG. 7 is a side view showing the operation status of the disassembly method of the present invention in the order of steps.

FIG. 8 is a side view showing the operation status of the disassembly method of the present invention in the order of steps.

FIG. 9 is an explanatory diagram showing an enlarged part IX in FIG. 6;

FIG. 10 is a side view showing a support state of the lower part of the scaffold along the line XX in FIG. 9;

FIG. 11 is an explanatory view of a conventional method of dismantling a steel freestanding chimney.

FIG. 12 is an explanatory view of a conventional method of dismantling a steel freestanding chimney.

FIG. 13 is an explanatory view of a conventional method of dismantling a steel freestanding chimney.

FIG. 14 is an explanatory view of a conventional method of dismantling a steel freestanding chimney.

FIG. 15 is an explanatory view of a conventional method of dismantling a steel freestanding chimney.

FIG. 16 is an explanatory view of a conventional method for dismantling a steel freestanding chimney.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Self-standing chimney to be disassembled 1a Cylindrical body part 2 Outer frame scaffold 3 Crane 6 Sling wire 7a, 7b Scaffolding floor 8 Guide 9 Guide roller 11 Wedge 12 Horizontal cutting line 13 Hook opening 14 Hook rod with turn buckle 15 Worker 16 ladder

Claims (1)

(57) [Claims] 1. A closed annular outer frame scaffold on which an operator rides is removably mounted on a top end of a chimney by a crane, and a plurality of hooks are hooked in a circumferential direction below a horizontal cutting line of the chimney. The opening is cut out, hooks are engaged with the opening via hook rods with turnbuckles at a plurality of lower portions of the outer frame scaffold, and the staking wire of the crane is replaced from the outer frame scaffold to the upper portion of the chimney, While receiving the weight of the chimney cutting section by a crane, the upper end of the chimney is cut along the horizontal cutting line and cut along with the cut-out chimney cylinder block. A method for dismantling a steel freestanding chimney, comprising repeating a step of lowering the stack.