JP2927320B2 - How to assemble a large hanging boiler - 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 for assembling a boiler, and more particularly to a method for assembling a structure for suspending and supporting a large boiler used in a thermal power plant or the like from above a building with a steel frame.

[0002]

2. Description of the Related Art Conventionally, a boiler in a thermal power plant or the like employs a suspension system, which often involves work at high places, which is extremely dangerous and inefficient. That is, in general, a building accommodating the boiler is assembled by a steel frame, a frame for supporting the boiler load is mounted on the top end of the steel frame, and boiler parts are mounted on the frame. In the frame, a frame main body is formed by a girder and an intermediate beam connecting the girder, and a shelf member called a wisteria trellis is constructed thereon. Then, a number of sling rods are attached to the wisteria trellis, and boiler components are connected to the sling rods to support them. When assembling such a boiler, the boiler parts are assembled downward from the height of several tens of meters to the upper frame in order, so that a safety net is attached or worked at the height of each construction stage. It was necessary to temporarily set up a scaffold, and the work efficiency was extremely poor.

In order to improve the working efficiency, various methods have been proposed. For example, there are known assembling methods disclosed in Japanese Patent Application Laid-Open Nos. 60-48404 and 60-48405. ing. FIGS. 5A and 5B show an assembling method disclosed in JP-A-60-48404, and FIGS. 6A and 6B are disclosed in JP-A-60-48405. It is a schematic diagram explaining an assembling method.
These are explanatory views during the assembly.

First, referring to FIG. 5, a steel frame 1 in the shape of a squirrel is assembled sequentially from the lower part, and a boiler suspension frame 2 is integrally fixed to the upper end thereof. Next, the components of the boiler are carried into the steel frame 1, a plurality of lifting devices 3 are fixed on the boiler suspension frame 2, and the boiler components are placed under the wire 4 which is hung near the ground. The boiler upper block 5 is assembled by attaching the boiler to the block 4. Then, the lifting device 3 is operated to lift the upper block 5 to a predetermined height. Then, the lower block 5 is coupled to the lower block 6 below and assembled. Thereafter, the operation of winding the wire 4 by the lifting device 3 and the operation of assembling the blocks of the boiler one after another while assembling them near the ground one after another and repeating the operation of joining the blocks on the boiler are repeated as shown in FIG. , Boiler assembly is finished. Then, after fixing the upper end of the boiler 7 to the boiler suspension frame 2, the lifting device 3 is removed to complete the assembling work.

[0005] In this assembling method, the lifting device 3 and the wires 4 are various in number, so that operability is poor and conversion to a regular lifting rod is required.
In order to improve this disadvantage, Japanese Patent Application Laid-Open No.
No. 0-48405 has proposed an assembling method. As shown in FIG. 6, the steel frame 8 is sequentially assembled from the lower part, and the upper end is connected to the connecting member 8c.
Is temporarily connected. Next, a temporary boiler suspension frame 9 composed of a horizontal member and a plurality of legs is integrally fixed to the upper end of the steel frame 8, and a plurality of lifting devices 10 are fixed thereon. Then, the wire 11 is suspended from each lifting device 10 to near the ground, and the lower end thereof supports the regular boiler lifting device 12. On the other hand, the components of the boiler are carried into the steel frame 8, and the upper block 13 is assembled from the regular boiler suspension frame 12 under a plurality of suspension rods 14 as suspension members to assemble the upper block 13. . And the lifting device 10 on the temporary frame 9
Is operated to wind up the wire 11, thereby lifting the upper block 13 to a predetermined height, and assembling the lower block 15 with the components of the next block 15 below the upper block 13. Thereafter, the operation of winding the wire 11 by the hoisting device 10 and the operation of assembling the block of the boiler with the block on the boiler are repeated to complete the assembly of the boiler 16. Then, after adjusting the height of the regular boiler suspension frame 12, this is fixed to the column 8a of the steel frame 8, and the temporary boiler suspension frame 9 and the lifting device 10 and the wire 11, which are accessories, are removed. Then, the assembly operation of the boiler is completed.

[0006]

However, in such a conventional boiler assembling method, it is necessary to temporarily connect the connecting member 8c and to set and remove the temporary boiler suspension frame 9. That is, the installation and removal of the connecting member 8c for connecting the upper end portion of the steel frame 8 and the installation and removal of the temporary frame 9 are required, so that the working steps cannot be said to be particularly shortened. Therefore, it is possible to improve safety against disasters such as earthquakes and strong winds without adding special reinforcing materials to the steel frame during construction, but the effects of temporary work and work in high places are reduced, and the effect of shortening the process is sufficient. It could not be said.

The present invention focuses on the above-mentioned conventional problems and increases the strength of a steel frame during construction without inserting a special reinforcing material to improve safety against disasters such as earthquakes and strong winds. It is another object of the present invention to provide a method for assembling a large suspended boiler capable of reducing temporary work and work at high places and shortening the steps.

[0008]

In order to achieve the above object, a method for assembling a large suspended boiler according to the present invention comprises providing a boiler support frame at the top end of a steel frame, and attaching the boiler to the support frame. In the assembly method of suspending and constructing, the boiler suspension frame attached to the top end of the steel frame is divided into upper and lower parts, and the upper frame is attached to the upper end of the steel frame and fixed, and provided on the upper frame. The hanging member is suspended from the boiler suspension mechanism to the vicinity of the ground and connected to the lower frame for boiler suspension assembled on the ground side, and the operation of raising the lower frame by the boiler suspension mechanism and each of the boilers on the ground side are performed. After assembling the boiler while repeating the operation of assembling the blocks and the operation of sequentially joining the blocks to the upper preceding block, the lower frame to which the boiler is assembled is attached to the boiler. Is obtained by configured to lower fixed suspended by coupling combined with La hanging upper Frames.

[0009]

According to the above construction, only the upper part of the regular boiler suspension frame divided at the upper end of the steel frame built on the ground is attached, and the lifting members such as jack rods are mounted on the boiler suspension mechanism provided on the upper frame. It can be suspended near the ground to support the boiler suspended lower frame assembled on the ground. The boiler can be assembled by repeating the operation of raising the lower frame by the boiler lifting mechanism and the operation of assembling each block of the boiler near the ground and connecting the lower frame to the preceding upper block sequentially. And finally,
The assembled boiler is suspended and fixed by joining the boiler suspension upper frame and the lower part. According to this method, the work efficiency and the safety are improved by reducing the temporary work and the work at a high place, and the process can be shortened by starting the assembling of the boiler suspended lower frame at an early stage and reducing the temporary removal work. In addition, the load during assembly is smaller than the load during operation of the boiler, and it can withstand even if the normal boiler suspension frame is divided, and it is safe against disasters such as earthquakes and strong winds without inserting special reinforcing materials into the steel frame. And a method for assembling a large suspended boiler that improves safety with improved performance.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a method for assembling a large hanging boiler according to the present invention.

FIG. 1 to FIG. 4 are explanatory diagrams of an assembling operation by an assembling method of a large hanging boiler according to an embodiment. The assembly operation process of the boiler according to the embodiment is roughly divided into a method of assembling a steel frame which becomes a boiler storage building and a process of assembling an upper frame particularly among frame elements obtained by vertically dividing a boiler supporting frame vertically. A step of connecting the lower frame to a lifting device on the upper frame and sequentially moving the lower frame while assembling the boiler constituent blocks thereto, and a step of interconnecting the finally separated upper and lower frames.

First, at the same time or in parallel with the assembling operation (not shown) of the steel frame on the bunker room side, the steel frame 20 on the boiler room side is sequentially constructed upward from the first lowermost section. . This is shown in FIG.
This is carried out by sequentially assembling a jagged steel frame 20 composed of a plurality of columns 22 and a truss 24 connecting them from a lower portion for each node, and using a truck crane or a crawler crane to carry in and lift the frame material. Implemented by interconnecting. The boiler room side steel frame 20 is assembled up to the sixth section in the illustrated example. And the assembled steel frame 20
At the top end, a frame 26 for boiler suspension support is attached.

As shown in FIG. 4, the suspension support frame 26 to be attached to the upper end of the steel frame 20 includes a plurality of (only one is shown) girders 28 serving as load support bodies. A so-called wisteria trellis is constructed by having an intermediate beam 30 connecting these large beams 28 to each other, and fixing an auxiliary beam 32 attached in a lattice shape to the upper surface side of the intermediate beam 30. The wisteria trellis is disposed and set on the lower side of the girder 28, and a boiler supporting sling rod 34 is attached to the wicker shelf to extend downward, and a boiler component is suspended and connected to this to support the boiler. It has become. In the structure of such a frame 26, in the present invention, the girder 28 is provided with a flange connecting portion 36 at an intermediate portion in the height direction, and is configured to be vertically separable at this portion. That is, the frame 26 can be separated into the upper frame 38U and the lower frame 38D by releasing the connection of the flange connecting portion 36. Therefore, the upper frame 38U is constituted by a girder member, and the lower frame 38D is constituted by a girder member, a wisteria trellis and a sling rod 34 attached thereto.

In such a structure of the frame 26, a frame 26 serving as a ceiling is attached after the construction of the boiler room side steel frame 20 is completed. As shown in FIGS. Is the upper frame 3 which was separately manufactured in advance
Only the 8U is fixed, and the steel frame 20 is completed except for the lower frame 38D for boiler suspension.

Such a steel frame 20 and the upper frame 3
After the completion of the construction of 8U, the components of the lower frame 38D for boiler suspension are carried into the steel frame 20 and the intermediate beams 30 and the auxiliary beams 32 are located on the ground immediately below the upper frame 38U.
And the sling rod 34 is assembled to assemble the lower frame 38D. And steel frame 2
The lower frame 38D assembled in 0 is connected to the upper frame 38U previously fixed to the upper end of the steel frame 20, so that the lower frame 38D can be jacked up. For this reason, as shown in FIG. 2A, a plurality of lifting mechanisms 40 are installed and fixed on the upper surface of the upper frame 38U, and a wire (or rod) 42 as a lifting member is provided near the ground. The boiler suspension lower frame 38 </ b> D is connected to and supported by the wire 42 on the ground.

After such operations, the boiler parts are carried into the steel frame 20, and the boiler upper block 44 is suspended from the plurality of sling rods 34 as suspension members suspended from the boiler suspension lower frame 38D. To assemble the boiler upper block 44 by connecting and supporting it. Then, as shown in FIG. 2 (2), the upper block 44 is lifted up to a predetermined height by operating the lifting mechanism 40 to wind up the wire 42, and the components of the next boiler intermediate block 46 are provided below the upper block 44. Is assembled with the boiler upper block 44.

Thereafter, the wire 42 is
Is repeated, and the operation of assembling the boiler lower block 48 with the upper boiler intermediate block 46 is repeated, thereby completing the assembly of the boiler assembly 50 as shown in FIG.

Accordingly, the boiler suspension lower frame 38D
Is fixed to the boiler suspended upper frame 38U and the upper end of the steel frame 20, and then the lifting mechanism 40 and the wire 42 are removed, thereby completing the boiler assembling operation.

In this embodiment, an example is shown in which the blocks 44, 46, 48,... Of the boiler assembly 50 are assembled in the steel frame 20, but these blocks 44, 46, 48,. After assembling it as a block unit at the location (1), the block unit may be carried into the boiler installation position, and may be carried into the steel frame 20 from an entrance provided at the lower part of the steel frame 20. By doing so, the time for assembling and installing the boiler can be significantly reduced.

In this embodiment, the wire 42 is exemplified as the lifting member, but a lifting rod may be used instead.

According to this embodiment, when assembling a large suspended boiler, all the blocks of the boiler can be assembled and connected at a low position near the ground, so that the safety of work and the efficiency of work can be improved. As well as temporary construction for high-place work such as scaffolding and safety nets is no longer necessary,
The assembly time can be reduced and the construction cost can be reduced. Also, since the boiler is assembled and lifted with the steel frame integrated with its pillars and the suspended upper frame from the beginning, the steel frame may collapse even if an earthquake or strong wind occurs during the assembly work. Therefore, there is no need to provide a design having a strength higher than necessary in consideration of this, and material costs and construction costs can be reduced.

[0022]

As described above, according to the present invention,
In particular, the boiler suspension support frame was separated vertically from the beginning, one was used to reinforce the steel frame, the other was used to assemble the boiler parts block, and the lower frame to which the boiler block was assembled was initially placed on the ground side, The boiler block is assembled on the ground side by ascending sequentially. For this reason, first, the reinforcement of the steel frame is realized by the frame from the beginning, and sufficient strength is maintained during construction, so that safety against disasters such as earthquakes and strong winds can be secured. In addition, since the separated lower frame is suspended from the upper frame and boiler block assembly work is performed on the ground side, work in high places is eliminated, and safety is improved in this regard. Therefore, the temporary construction work can be reduced, and since the steel frame is reinforced using a regular frame, the reinforcement temporary construction work can also be reduced, so that the effect of extremely shortening the process can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view and a side view showing an initial steel frame assembling state by a method of assembling a large hanging boiler according to an embodiment.

FIG. 2 is an explanatory view showing a process of assembling a large suspended boiler, which includes raising a lower frame and assembling a boiler block.

FIG. 3 is a front view and a side explanatory view of a boiler assembling completed state by the method of assembling the large hanging boiler.

FIG. 4 is a detailed view of a boiler suspension support frame.

FIG. 5 is an explanatory diagram of a first method according to a conventional example.

FIG. 6 is an explanatory diagram of a construction method according to a second conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Boiler room side steel frame 22 Column 24 Truss 26 Boiler suspension support frame 28 Large beam 30 Intermediate beam 32 Auxiliary beam 34 Sling rod 36 Flange connection part 38U Upper frame 38D Lower frame 40 Lifting mechanism 42 Wire (or rod) 44 Boiler upper part Block 46 Boiler intermediate block 48 Boiler lower block 50 Boiler assembly

Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F22B 37/24

Claims (1)

(57) [Claims] 1. An assembling method for providing a boiler support frame at a top end of a steel frame and suspending the boiler on the support frame, the boiler suspension frame attached to the top end of the steel frame is vertically moved. For the boiler suspension assembled on the ground side by hanging the upper frame at the upper end of the steel frame and fixing the upper frame, and suspending the suspension member from the boiler suspension mechanism provided on the upper frame to near the ground Connected to the lower frame, after assembling the boiler while repeating the operation of raising the lower frame by the boiler suspension mechanism and the operation of sequentially assembling the boiler blocks on the ground side and sequentially coupling to the upper preceding block, A large suspension type wherein the assembled lower frame is suspended and fixed by being connected and connected to the boiler suspension upper frame. How to assemble a boiler.