JP2001173901A - Scaffold structure in furnace and method of installation thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scaffold structure, where the equipment and materials of the scaffold structure inside a furnace for check and repair are easy to assemble and the method of installation thereof. SOLUTION: A scaffold 7, a pulley block 8 and a wire take-up roller 9 are carried into the inside of the furnace through a manhole 6 arranged at the bottom wall part 5 of a countermure, wire 10 from the roller 9 is attached to the edge part of a scaffold 7 via a pulley block 8, the scaffold 7 is temporarily placed in the direction of the width of the furnace, a pulley block suspending wire is dropped from an opening part arranged at a ceiling part 11, the pulley block 8 is hoisted to the ceiling part 11 by the wire, the scaffold 7 is erected by winding the wire 10 from the roller 9, the scaffold 7 is turned to the horizontal position towards the front of a furnace 1 through the gap of a screen pipe 13 feeding the wire 10 by the roller 9, pushed forward toward pendant heat exchangers 19 to 22, and fixed at the cross point between the screen pipe 13 of the scaffold 7 and the pendant heat exchangers 19-21, above described work is repeated in turn and at least two of the scaffolds 7 extended inside the furnace are mutually connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method and a scaffold structure for installing a scaffold on an upper part of a furnace of a boiler whose operation has been stopped.

[0002]

2. Description of the Related Art As shown in FIG. 8, periodic inspection of the inside of a boiler and hanging type heat exchangers 19 to 2 installed in the boiler are performed.
In order to repair the second or the like, the operation of the boiler is stopped and a scaffold device is installed in the furnace 1.

[0003] The conventional scaffolding device is installed in such a manner that after the operation of the boiler is stopped, when the furnace 1 is completely cooled, an operator enters the furnace 1 and loads the scaffolding equipment in the furnace 1 to the upper part of the furnace bottom 2 of the furnace 1. First, a horizontal stage 3a is installed, a scaffold 4a is stacked along the wall surface of the furnace 1 above the horizontal stage 3a, and a horizontal stage 3b is installed above the furnace 1;
Above the horizontal stage 3b, the scaffold 4b is stacked and assembled near the wall surface of the furnace and near the suspended heat exchangers 19 to 22.

[0004]

As described above, conventionally, in order to assemble the scaffolds 4a and 4b from the furnace bottom 2, a horizontal stage 3a is installed on the inclined furnace bottom 2, and the scaffolds 4a and 4b and the horizontal stage are further provided. Since 3b is installed, it takes a considerable number of days to assemble the in-furnace scaffolding equipment.

[0005] It is an object of the present invention to provide a scaffold structure and a method of installing the scaffold structure, which can relatively easily assemble the scaffold equipment in the furnace.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to inspect or repair a furnace ceiling and a suspended heat transfer device disposed in a sub-side wall behind the boiler on the ceiling.
In the method of installing a scaffold structure extending and provided in a furnace, a manhole is provided in a bottom wall portion of the sub-side wall, and a scaffold installation device including a furnace extension scaffold and a wire is carried into the furnace from the manhole. An opening is provided in the ceiling, and the distraction scaffold is raised from the opening with a wire attached to the tip of the distraction scaffold, in the front-back direction of the furnace, and in the direction in which the distraction scaffold extends into the furnace. Dispense the wire towards the front of the furnace until the distraction scaffold is horizontal, further fix the distraction scaffold to the suspended heat exchanger, repeat the above work in sequence, into the furnace by the work The problem is solved by a method of installing a distraction scaffold that connects at least two of the distracted distraction scaffolds to each other.

The more specific method of the present invention is as follows. That is, in order to perform inspection or repair of the upper part of the furnace provided with the hanging type heat transfer device or the like in the furnace, in the installation method of the scaffold extended to be provided in the furnace, the scaffold was provided on the bottom wall portion of the sub-side wall. From the manhole into the furnace, load the scaffold installation equipment including the in-furnace distraction scaffold, pulley and wire take-up roller, and wire the wire from the wire take-up roller to the tip of the furnace distraction scaffold via the pulley. Attaching, temporarily placing the scaffold for in-furnace extension in the furnace width direction, lowering the pulley support wire from the opening provided in the ceiling, lifting the pulley to the ceiling with the wire, and winding the wire By winding the wire from the roller, a scaffold for in-furnace distraction is set up, and the rotation direction of the pulley is set in the fore-and-aft direction of the furnace, in a direction in which the in-furnace distraction scaffold distracts into the furnace. The wire is sent out by the yarn take-up roller, and the scaffold for in-furnace distraction is lowered from the gap between the screen tubes toward the front of the furnace until it is horizontal. Extruded forward, the in-furnace distraction scaffold was fixed at the intersection of the scaffold with the screen tube, and the operation was sequentially repeated, and at least the in-furnace distraction scaffold extended into the furnace by the operation 2
Connecting the books to each other by a connecting means, and in the step, at least two or more of the in-furnace extension scaffolds extended into the furnace, from the side near the fixed portion to the screen tube, in the forward direction of the furnace, Sequentially attaching scaffolding restraining means to the inwardly extending scaffold; and, in said step, restraining the in-furnace inwardly extending scaffold in the furnace to a suspended heat exchanger; Providing a working floor between the inward distraction scaffolds.

[0008]

According to the above-described method of installing the scaffold for in-furnace extension, the scaffold is extended from the bottom wall of the sub-side wall toward the front of the furnace, so that the scaffold is not assembled sequentially from the bottom of the furnace, and thus the upper part of the furnace is not assembled. Scaffolding can be installed at Further, the scaffold for in-furnace extension is extended from the gap between the screen tube and the suspended heat transfer device toward the front of the furnace, and at the intersection with the screen tube and the suspended heat transfer device, It can be supported by constraining these devices.

The length between the end of the in-furnace scaffold and the link is shorter than the length between the sub-wall bottom wall and the ceiling wall, and the tip of the scaffold is connected to the ceiling via a pulley provided on the ceiling. The scaffold can be extended up to the suspended heat transfer device in the furnace by raising the pulley, turning the pulley in the fore-and-aft direction of the furnace and turning the scaffold forward in the furnace.

According to the scaffold installation method of the present invention, the opening provided in the furnace wall of the boiler is only the opening provided in the furnace ceiling for lowering the pulley supporting wire,
In the scaffold installation method of Utility Model No. 2524101,
There is no need to provide a large number of furnace wall openings such as the required scaffold beam insertion port, installation port, and insertion port.

Further, in the invention of the utility model No. 2524101, since a support beam or the like penetrates through the opening of the furnace wall,
A large opening is required, and the furnace wall tube near the opening must be bent into a shape corresponding to the opening from the time of boiler construction, and a large lid for securing the closed state during boiler operation. is necessary.

On the other hand, in the present invention, the opening penetrating the furnace wall passes only the wire, so that a relatively small opening may be provided, and it is necessary to bend the furnace wall tube near the opening. Since there is no boiler, it is easy to secure the closed state during boiler operation.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment to which the present invention is applied will be described below with reference to FIGS. 1 to 5 are side views of a main part of a furnace for explaining a procedure for installing a scaffold on a furnace ceiling and a sub-side wall in which suspended heat exchangers 19, 20, 21, and 22 are arranged in a furnace of a boiler. 6 is a perspective view of the in-furnace distraction scaffold, and FIG. 7 is a plan view of the in-furnace distraction scaffold of FIG. 4 in an installed state.

As shown in FIG. 1, scaffold installation equipment including a furnace extension scaffold 7, a pulley 8 and a wire winding roller 9 is carried into the furnace 1 from a manhole 6 provided on the sub-wall bottom wall 5. Then, the wire 10 extended from the wire take-up roller 9 is attached to the tip of the in-furnace distraction scaffold 7 via the pulley 8. The in-furnace distraction scaffold 7 is temporarily placed in the furnace width direction (direction orthogonal to the boiler front-rear direction) of the sub-wall bottom wall 5 of the furnace ceiling 11, and an opening provided in the furnace ceiling 11 in the sub-wall portion. The pulley supporting wire 12 is further lowered through the ceiling 11, and the pulley 8 is lifted up to the ceiling 11 by the wire 12.

Next, as shown in FIG. 1, the tip of the in-furnace extension scaffold 7 is lifted by winding the wire 10 from the wire take-up roller 9, and the furnace is extended from the tip of the in-furnace extension scaffold 7 into the furnace. Link 1 at the lower end of distraction scaffold 7
Start up to 6. As shown in FIG. 6, the link portions 16 connect the ends of the in-furnace distraction scaffolds 7 and determine the number of the link portions 16 to be installed according to the required installation length of the in-furnace distraction scaffolds 7.

Further, as shown in FIG. 2, the direction of rotation of the pulley 8 is in the front-rear direction of the furnace 1 and, at the same time, the direction of extension of the in-furnace extension scaffold 7 into the furnace. The link part 16 is attached to.

Next, as shown in FIG. 3, the wire 10 is sent out by the wire take-up roller 9, and the tip of the in-furnace distraction scaffold 7 attached to the wire 10 is moved from the gap of the screen tube 13 to the front of the furnace 1. Knock down
Further, as shown in FIG. 4, after the in-furnace distraction scaffold 7 is pushed out to the front of the boiler furnace 1, the in-furnace distraction scaffold 7 is fixed to the screen tube 13 at the intersection of the scaffold 7 and the screen tube 13. .

Further, the above operation is repeated, and at least two of the in-furnace extension scaffolds 7 extended in parallel in the furnace are connected to each other by a connecting metal 14 from a fixing portion with the screen tube 13 as shown in FIG. The connection is made sequentially toward the front inside the furnace 1.

Further, the pin 15 for preventing rotation of the in-furnace distraction scaffold 7 is fixed to the screen tube 13 by a fixing portion from the boiler furnace 1.
The rotation of the in-furnace distraction scaffold 7 can be prevented by sequentially inserting the in-furnace distraction scaffold 7 toward the front inside the furnace.

In the process of sequentially attaching the connection fittings 14 and the pins 15 from the fixing portion between the screen tube 13 and the in-furnace distraction scaffold 7 toward the front of the furnace 1, the connection fittings 14 and the pins 15 are attached. As shown in FIG. 7, a scaffold plate 17 is sequentially stretched on the in-furnace distraction scaffold 7 in the completed area, and a gap between the screen tube 13 and the suspended heat transfer device 21 in the boiler front-rear direction and suspension is provided. The work can be performed more safely and efficiently by extending the scaffold plate 18 between the adjacent in-furnace extension scaffolds 7 in the gap between the lowered heat exchangers 19 to 21 in the boiler front-back direction.

As described above, the connecting operation of the in-furnace distraction scaffold 7 and the attaching operation of the scaffold plate 17 are performed by the screen tube 1.
3 is repeated from the fixing portion 24 (FIG. 4) to the front of the boiler furnace 1.

In the course of the above operation, as shown in FIG. 5, the in-furnace distraction scaffold 7 is fixed to the screen tube 13 at a fixing portion 24 where the screen tube 13 intersects, and then is suspended. The fixing part 25 and the fixing part 26 which are the intersections with the heat transfer tube 21 are fixed, and the hanging type heat transfer tube 2 is fixed.
1 supports the in-furnace distraction scaffold 7.

The fixing operation is performed using a wire, a chain block and the like. In the same manner as the above operation, the fixing portions 27 to 27 which are the intersections with the suspended heat transfer tubes 19 to 20 are sequentially arranged.
29 are respectively fixed.

Therefore, in addition to supporting the tip of the in-furnace distraction scaffold 7 by the wire 10 from the wire take-up roller 9 via the pulley 8 of the ceiling 11, the in-furnace distraction scaffold 7 is connected to the screen tube. 13 and the crossing with the hanging type heat exchanger tubes 19 to 21 can be prevented from bending by being fixedly supported, and the operation can be performed safely.

[0025]

According to the scaffold structure in the furnace according to the present invention, the scaffold can be extended from the bottom wall of the sub-side wall to the upper part of the furnace as in the prior art. This eliminates the need to assemble the scaffold, greatly reducing the number of days required for scaffold installation, enabling quick repair of the suspended heat transfer tubes, and shortening the outage period of the power plant.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a furnace showing a procedure of extending a scaffold to an upper part in a furnace of a boiler according to an embodiment of the present invention.

FIG. 2 is a side view of a main part of the furnace, showing a procedure of extending a scaffold to an upper part in the furnace of the boiler according to the embodiment of the present invention.

FIG. 3 is a side view of a main part of the furnace showing a procedure of extending a scaffold to an upper part in the furnace of the boiler according to the embodiment of the present invention.

FIG. 4 is a side view of a main part of the furnace, showing a procedure of extending a scaffold to an upper part in the furnace of the boiler according to the embodiment of the present invention.

FIG. 5 is a side view of a main part of the furnace, showing a procedure of extending a scaffold to an upper part in the furnace of the boiler according to the embodiment of the present invention.

FIG. 6 is a perspective view showing an in-furnace distraction scaffold having a link portion in a furnace of the boiler according to the embodiment of the present invention, and a connecting fitting and a pin for connecting adjacent in-furnace distraction scaffolds.

FIG. 7 shows a screen tube from the bottom of the sub-side wall in the furnace of the boiler according to the embodiment of the present invention toward the front of the boiler.
FIG. 4 is a plan view of a scaffold installed in a gap between the suspended heat exchangers.

FIG. 8 is a side view of a main part of a furnace showing a method of installing a horizontal stage from the furnace bottom in a furnace of a conventional boiler and installing a scaffold on an upper part of the furnace.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Furnace 2 Furnace bottom 3a, 3b Horizontal stage 4a, 4b Scaffold 5 Secondary wall bottom wall 6 Manhole 7 Scaffold for in-furnace extension 8 Pulley 9 Wire winding roller 10, 12 Wire 11 Ceiling 13 Screen tube 14 Connection metal 15 Pin 16 Link portions 17, 18 Scaffolding plates 19, 20, 21, 22 Hanging heat transfer tubes 23 Stoppers 24, 25, 26, 27, 28, 29 Fixing portions

Claims (8)

[Claims] 1. A scaffold structure extending into a furnace for inspecting or repairing a furnace ceiling and a suspended heat transfer device arranged in a sub-side wall behind the boiler on the ceiling. In the installation method of (1), a manhole is provided in a bottom wall portion of the sub-side wall, a scaffold setting device including a scaffold for extending in-furnace and a wire is carried into the furnace from the manhole, an opening is provided in a ceiling portion, and an opening is provided in the ceiling. The distraction scaffold is started up with the wire attached to the tip of the distraction scaffold from the part, and the wire is sent out in the fore-and-aft direction of the furnace and in the direction of extension of the distraction scaffold into the furnace, and the distraction scaffold is horizontal. Fold down the front of the furnace until it becomes, and further fix the distraction scaffold to the suspended heat exchanger, repeat the above work in sequence, and attach at least two of the distraction scaffolds extended into the furnace by the work. Features to be connected The method of installation distraction scaffold. 2. A scaffold structure extending and provided in a furnace for inspecting or repairing a ceiling portion of a furnace and a suspended heat transfer device disposed in a sub-side wall portion of the ceiling portion behind the boiler. In the installation method, a manhole is provided in a bottom wall portion of the sub-side wall, and a scaffold setting device including a scaffold for in-furnace extension, a pulley, and a wire winding roller is carried into the furnace from the manhole, and the wire winding roller is provided. After attaching the wire from above to the distal end of the distraction scaffold via the pulley, the distraction scaffold is temporarily placed in the furnace width direction, an opening is provided in the ceiling, and the pulley supporting wire is inserted into the furnace from the opening. And pulling up the pulley to the ceiling with the wire, winding up the wire from the wire take-up roller, rising from the tip of the distraction scaffold, and changing the rotation direction of the pulley to the furnace In the backward direction, the wire is fed out by a wire take-up roller in the direction of extension of the distraction scaffold into the furnace, and the wire is leveled from the distal end of the distraction scaffold through the gap of the screen tube installed on the sub-sidewall. Fold the distraction scaffold toward the front of the furnace until it reaches the end, and push the distraction scaffold forward while sending out the wire toward the front of the furnace toward the suspended heat exchanger to be inspected or repaired. A scaffold is fixed to a screen tube at an intersection with the screen tube of the scaffold, and the operation is sequentially repeated, and at least two distraction scaffolds extended into the furnace by the operation are connected to each other. How to install a scaffold. 3. A method in which at least two or more distraction scaffolds extending from at least two distraction scaffolds are constrained adjacent to each other in order from the side closer to the fixing portion to the screen tube toward the front of the furnace. The method for installing a distraction scaffold according to claim 2. 4. A distraction scaffold extended in a furnace is suspended from a side near a fixing portion to a screen tube at a crossing position with a plurality of hanging heat exchangers in front of the furnace from a side close to a fixing portion to a screen tube. 3. The method for installing a distraction scaffold according to claim 2, wherein the scaffold is fixed to a lowered heat exchanger. 5. The scaffold installation method according to claim 2, wherein a work floor is provided between adjacent distraction scaffolds. 6. A scaffold structure extending into a furnace for inspecting or repairing a furnace ceiling portion and a suspended heat transfer device disposed in a sub-side wall portion behind the boiler on the ceiling portion. In, extends from the gap between the screen tube installed on the sub-side wall and the plurality of hanging type heat exchangers suspended from the furnace ceiling, toward the furnace front, at the intersection with the screen tube Being restrained by the screen tube,
At a crossing position with at least one suspended heat transfer device, a distraction scaffold restrained by the suspended heat transfer device, and a pitch and arrangement of the screen tube and the suspended heat transfer device in the furnace width direction. A scaffold structure comprising: a pulley suspended from an opening provided in a ceiling portion based on a ceiling; and a wire supporting a distraction scaffold connected to a distal end portion of the in-furnace distraction scaffold. 7. The scaffold structure according to claim 6, wherein at least two or more distraction scaffolds are provided, and adjacent in-furnace distraction scaffolds are restrained by restraining means. 8. An end of the distraction scaffold is connected to at least one or more link portions, and the length of the distraction scaffold and the length of the link portion are determined by the distance between the sub-wall bottom wall and the furnace ceiling. The scaffold structure according to claim 7, wherein the length is shorter than the length between them.