JPH06323504A - Large size suspension type boiler overhauling method - Google Patents

Abstract

PURPOSE:To ensure safety against disasters such as earthquakes or strong winds and so on, to curtail temporary setting work and work at high place and to shorten a process of overhauling work by enlarging overhauling work of a suspension type large size boiler without executing temporary setting work for sustaining strength of steel frames. CONSTITUTION:At an ceiling edge section of a steel frame 10, a boiler supporting frame structure is set, and at overhauling a large size suspension type boiler, a boiler suspending mechanism is set and by a suspension material which is made to suspend from this, a connection to frame structure under section is intended. A boiler suspending and supporting frame structure is set with dividable state to an upper part and to an under part and with a mounted state of its upper section frame structure 12U, a connection of the upper part frame structure 12U and the under part frame structure is released. After that, with repetition of an action making the under section frame structure 12D go downwards, an overhauling of each block of the boiler at a portion near to the ground, connection releasing action from an upper section block and an action for discharging, an overhauling of the boiler is executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dismantling a large-sized hanging boiler, and more particularly to a method for dismantling a large-sized boiler suspended from a supporting frame installed above a steel frame used in a thermal power plant or the like. It is about.

[0002]

2. Description of the Related Art As a type of boiler, a boiler frame is housed inside a steel frame that is erected on the ground, and is supported by a suspension frame fixed to the upper end of the steel frame. A large-sized hanging boiler is known.

FIGS. 5 (1) and 5 (2) are schematic front views showing states in the middle of disassembling in order to explain a conventional method of disassembling a boiler of this type. The dismantling method will be described. FIG. 5 (1) shows a large-sized suspension type boiler equipment before dismantling. First, a plurality of boiler suspension mechanisms 3 are fixed to a boiler suspension frame 2 fixed to the upper end of a steel frame 1. Then, the wire 4 as a suspending member is hung from this and connected to the upper block 6 of the boiler. After this preparatory step, as shown in FIG. 5 (2), the plurality of suspension rods 5 suspending the upper block 6 are removed, the boiler suspension mechanism 3 is operated, and the block 7 of the boiler is removed near the ground. While disassembling and carrying out the above, the operation of lowering the wire 4 by the boiler suspension mechanism 3 is repeated, so that the dismantling of the boiler 8 is completed. After that, the boiler suspension mechanism 3 and the boiler suspension frame 2 are removed, and then the steel frame 1 is sequentially disassembled from above to complete the work.

[0004]

However, in such a conventional boiler disassembling method, a large number of boiler suspension mechanisms 3 and many wires 4 are required, resulting in poor operability and an upper block 6 of the boiler at a high place. The work of attaching the wire to the wire and removing the regular suspension rod 5 increased, and a work scaffold, a safety net, etc. were required, and the temporary construction was troublesome, and the work was dangerous and inefficient.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks, and to increase the strength of the steel frame during the dismantling without adding a special reinforcing material to the earthquake,
It aims to improve safety against disasters such as strong winds, reduce temporary construction work and work in high places, and shorten the process of dismantling work.

[0006]

In order to achieve the above object, a method for disassembling a large-sized hanging boiler according to the present invention is provided with a boiler supporting frame provided at the top end of a steel frame. At the time of disassembling a large-sized suspension boiler having a structure in which the boiler is suspended and supported, a boiler suspension mechanism is installed on the supporting frame, and a suspension member suspended from the boiler suspension mechanism is used to connect with the lower part of the frame. The suspension supporting frame is set to be vertically separable, and the upper frame is attached to the upper end of the steel frame while the lower frame suspending the boiler is separated to separate the upper frame and the lower frame. Repeat the operation of releasing the connection, then lowering the lower frame by the boiler suspension mechanism, disassembling each block of the boiler near the ground, releasing the connection with the upper block, and discharging. And configured to dismantle the boiler.

[0007]

According to the above construction, the regular boiler suspension frame attached to the upper end of the steel frame is divided and set, and the upper frame is still attached to the steel frame, and the boiler suspension mechanism installed in this upper frame is used. The lower frame separated by the suspension member is suspended and supported. For this reason,
In the steel frame, the upper frame is used as the upper end beam member, the strength of the steel frame can be secured, and it is not necessary to use a separate reinforcing material. Since the lower frame is lowered while the boiler is being hung, the boiler components are sequentially disassembled and discharged for each boiler component that reaches the ground side first, and the lower frame lowering operation is repeated in sequence, Is dismantled. By this method, temporary construction work and work at high places can be reduced, work efficiency and safety can be improved, and the process can be shortened. In addition, the load during dismantling is smaller than the load during boiler operation, it can withstand even the normal boiler suspension frame is split, and the safety of earthquakes, strong winds and other disasters can be improved without installing special reinforcements in the steel frame. It will be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for disassembling a large suspension type boiler according to the present invention will be described in detail below with reference to FIGS.

1 to 4 are explanatory views of a dismantling method of a large-sized hanging boiler according to an embodiment. First, FIG. 2 shows a state of equipment before dismantling work. As shown in the drawings, a boiler room side is shown. A boiler suspension support frame 12 is fixed to the upper end of the steel frame 10. The support frame 12 is a plurality of girders 1.
4 and the intermediate beam 15 and the intermediate beam 1 that connect them.
5, the main body is constituted by an auxiliary beam 16 forming a so-called rattan, and a sling rod 18 used for suspension is hung from the auxiliary beam 16. The boiler 20 is suspended and supported by the sling rod 18.

In such equipment, the boiler suspension support frame 12 is set to be vertically separable as shown in FIG. 3 (1). That is, the girder 14 is provided with the flange coupling portion 22 at the intermediate portion in the height direction, and the upper and lower portions can be separated at this portion. That is, frame 12
The upper frame 12U and the lower frame 12D can be separated by releasing the coupling of the flange coupling portion 22. Therefore, the upper frame 12U is composed of a girder member, and the lower frame 12D is composed of a girder member and rattan and sling rods 18 attached thereto. Such a separated structure of the frame 12 may be set in advance to a structure in which the large beam 14 is flange-connected at the time of constructing the boiler. If the structure is not flange-bonded at the time of construction, as shown in FIG. 3 (2), the upper reinforcing flange 24U and the lower reinforcing flange 24D are fixed to the middle part of the web of the girder 14 by welding, and The cutting margin 26 may be formed between the reinforcing flanges 24U and 24D.

In such a structure of the frame 12, a boiler suspension mechanism 28 is installed and fixed to the upper part of the frame 12, that is, the upper frame 12U, in preparation for dismantling work.
From this, the wire 30 as a suspending member is suspended and connected to the lower frame 12D. As a result, the boiler suspension support lower frame 12D in which the boiler 20 is suspended by the plurality of sling rods 18 as suspension members is coupled and supported by both the flange coupling portion 22 and the suspension mechanism 28.

After the above setting, the connection between the boiler suspension upper frame 12U and the boiler suspension lower frame 12D is released. This is the flange joint 22 in the case of a structure that is divided at the time of construction as shown in FIG. 3 (1).
It is done by releasing the bolt connection of. Further, the reinforcing flanges 24U, 24 as shown in FIG.
In the case of the frame 12 to which D is attached, the cutting allowance 26 between the upper and lower reinforcing flanges 24U and 24D is welded during disassembly.
The bond is released by cutting.

After such pretreatment, as shown in FIG. 2, the boiler suspension mechanism 28 is operated to wind down the wire 30 and the lower block 3 of the boiler 20 near the ground.
The dismantling and carrying-out operation of No. 2 and the operation of releasing the connection with the intermediate block 34 located immediately above it are performed. Furthermore, FIG.
As shown in (1), the next block 34 is similarly disassembled and carried out. Then, as shown in FIG. 1 (2), after dismantling and carrying out the upper block 36, the sling rod 18 and the boiler suspension supporting lower frame 12D are dismantled and carried out. After that, as shown in FIG. 4, after removing the boiler suspension mechanism 28 and the boiler suspension upper frame 12U, the steel frame 10 is sequentially disassembled from the top to complete the disassembly work.

In the above embodiment, the boiler 20
Although an example of disassembling and carrying out each block 32, 34, 36, ... Of the inside of the steel frame 10 is shown, after carrying them out from the steel frame 10 through the outlet provided in the lower part of the steel frame 10 in the block shape. , May be subdivided and disassembled at another place. By doing so, the dismantling period of the boiler can be significantly shortened.

In the above embodiment, the wire 30 is used as the suspending member, but a suspending rod may be used.

As described above, in this embodiment, in the disassembling method of the large hanging type boiler, each block 3 of the boiler is used.
Since the decoupling of 2, 34, 36 ... and the dismantling work can all be done at a low position near the ground, work safety and work efficiency can be improved, and temporary work for high places such as scaffolding and safety nets can be performed. Construction work will be reduced, and it will be possible to shorten the dismantling period and reduce construction costs. Further, since the boiler 20 is disassembled in a state where the steel frame 10 is integrated with the pillar and the suspension upper frame 12U, there is a concern that the steel frame 10 will collapse even if an earthquake or a strong wind occurs during the disassembly work. There is no need for a design that has more strength than necessary in anticipation of this, and it is possible to reduce material costs and construction costs.

[0017]

As described above, according to the present invention, the dismantling of a large suspension type boiler having a structure in which a boiler supporting frame is provided at the top end of a steel frame and the boiler is suspended and supported by the supporting frame. At this time, a boiler hanging mechanism is installed on the supporting frame, and a hanging member hanging from this is used to connect with a lower part of the frame, and the boiler hanging supporting frame is set to a vertically separable state, With the upper frame attached to the upper end of the steel frame, the lower frame that suspends the boiler is separated to disconnect the upper frame from the lower frame, and then the lower frame is lowered by the boiler suspension mechanism. Since it was configured to dismantle the boiler while repeating the operation to perform and the dismantling of each block of the boiler near the ground and the disconnecting and discharging operation of the upper block,
The strength of the steel frame during dismantling is increased without inserting special reinforcements to improve safety against disasters such as earthquakes and strong winds, and temporary work and work at high places are reduced, and the process of dismantling work is shortened. It is possible to obtain an excellent effect that

[Brief description of drawings]

FIG. 1 is an explanatory view of a work process in the middle of disassembling a disassembling method for a large suspension boiler according to an embodiment.

FIG. 2 is a front view and a side sectional view of a steel frame in a boiler suspended state showing a preparation state for dismantling work.

FIG. 3 is an explanatory diagram of a boiler suspension support frame that is set up and down separately for disassembly.

FIG. 4 is a front view and a side view of the steel frame after the boiler is removed.

FIG. 5 is a schematic front view showing a state in the middle of disassembling in order to explain a disassembling method of a conventional large suspension boiler.

[Explanation of symbols]

 10 Steel Frame 12 Boiler Suspending Support Frame 12U Upper Frame 12D Lower Frame 14 Large Beam 15 Intermediate Beam 16 Auxiliary Beam 18 Sling Rod 20 Boiler 22 Flange Joint 24U, 24D Reinforcing Flange 26 Cutting Boiler 28 Boiler Suspension Mechanism 30 Wire 32 Boiler Lower Part Block 34 Boiler middle block 36 Boiler upper block

Claims (1)

[Claims] 1. When disassembling a large suspension boiler having a structure in which a boiler supporting frame is provided at the top end of a steel frame and the boiler is suspended and supported by the supporting frame, the boiler is suspended on the supporting frame. A hanging mechanism is installed and the hanging member hung from this is connected to the lower part of the frame, and the boiler suspension supporting frame is set to be vertically separable, and its upper frame is attached to the upper end of the steel frame. In this state, the lower frame that suspends the boiler is separated, the upper frame and the lower frame are disconnected, and then the lower frame is lowered by the boiler suspension mechanism and each boiler block near the ground. The method for dismantling a large-sized hanging boiler, characterized in that the boiler is dismantled while repeating the dismantling, the coupling with the upper block, and the discharging operation.