JP2005155933A - Disassembly method for boiler facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disassembly method for a boiler facility capable improving workability and safety by lowering a boiler body and a top girder in well balanced manners. <P>SOLUTION: In the disassembly method, a process of suspending and lowering the boiler body 1 and the top girder 3 at the same time, and a process of disassembly are repetitively carried out. A temporary beam 5 is temporarily provided on a support frame 3, and the boiler body 1 and the top girder 3 are suspended from the temporary beam 5. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for dismantling boiler equipment installed in a thermal power plant or the like.

  Boiler equipment installed in thermal power plants, etc., is generally in a state where a top girder (main beam) is installed on the upper part of the support frame installed so as to surround the boiler body, and the boiler body is suspended from this top girder. The structure to support is adopted. Such boiler equipment is dismantled after the end of its useful life, but since it is a relatively large-scale equipment, dismantling takes a lot of trouble. As a conventional dismantling method, for example, a method is proposed in which a boiler body is lowered stepwise and disassembled from the lower part of the boiler body, and then the support frame is disassembled. However, with this dismantling method, it takes time to remove the boiler body from the top girder, and it takes a lot of time to remove the top girder that is installed at a high place and is a heavy load from the support frame. There was a problem. Therefore, for example, a dismantling method as in Patent Document 1 has been proposed. In this dismantling method, first, a plurality of hydraulic jacks are installed on the support frame above the top girder, and the rods of the hydraulic jack are connected to the top girder. Next, the top girder is separated from the support frame by separating the end of the top girder, and the top girder is supported on the support frame via the hydraulic jack. Next, the hydraulic jack is operated to lower the top girder and the boiler body together by a certain amount. Then, the operation | work which disassembles this in order from the lower part of a boiler main body, and a top girder and the fall of a boiler main body are repeated, these are disassembled, and finally a support frame is disassembled and the dismantling of boiler equipment is complete | finished.

Japanese Patent Laid-Open No. 10-46838

  Here, the boiler body and the top girder have various load distributions depending on their designs. Therefore, when the boiler body and the top girder are suspended and lowered at the same time, it is necessary to lower them in a balanced manner. However, in the dismantling method of Patent Document 1, since the jack is installed on the support frame, there are certain restrictions on the installation location of the jack, and the jack cannot be installed at an arbitrary position. For this reason, it is not always easy to lower the boiler body and the top girder in a well-balanced manner, and there is a problem in construction difficulty and safety.

  Accordingly, an object of the present invention is to provide a boiler facility dismantling method that can lower the boiler body and the top girder in a well-balanced manner and can improve workability and safety.

  According to the present invention, there is provided a method for disassembling boiler equipment comprising a boiler body, a top girder on which the boiler body is suspended, and a support frame that supports the top girder. A temporary step of temporarily setting a temporary beam for suspending the girder; an installation step of installing a descent device for dropping the top girder from the temporary beam together with the boiler body; and the top gutter from the support frame A separation step of separating the top girder together with the boiler body by the lowering device, and a repetition step of alternately repeating a disassembly step of disassembling the boiler body a plurality of times. A featured method of dismantling boiler equipment is provided.

  According to this dismantling method, since the boiler body and the top girder are suspended via the temporary beam and the temporary beam is supported by the support frame, the boiler body and the top girder can be stably lowered. . Moreover, since a descent | fall apparatus can be provided in the arbitrary positions on a temporary beam, these can be arrange | positioned corresponding to the load distribution of a boiler main body and a top girder. Therefore, the boiler main body and the top girder can be lowered more safely and easily, and it is possible to deal with various boiler facilities. In the repetitive process, the descending process may be performed in the order of the dismantling process, or the dismantling process may be performed in the order of the descending process.

  In the present invention, the descent device includes a suspension member and a jack that moves along the suspension member. In the installation step, the upper end of the suspension member is attached to the temporary beam and the jack is attached to the temporary beam. It can also be attached to the top girder. In this way, the suspension material can be installed in advance over the required length, the work of installing the suspension material every time the jack is lowered can be omitted, and the work of lowering the jack can be proceeded quickly.

  According to the present invention, the boiler body and the top girder can be lowered in a well-balanced manner, and the workability and safety can be improved.

  Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is an external perspective view of boiler equipment A which is an example of the dismantling method of the present invention, and FIG. 2A is a schematic structural diagram of boiler equipment A. In general, the boiler facility A includes a boiler body 1, a top girder 3 that supports the boiler body 1 by hanging a plurality of suspension members 2 such as steel bars, and a support frame 4 that supports the top girder 3. . The support frame 4 includes column portions 4a and 4b respectively disposed on the left and right sides of the boiler body 1, and each of the column portions 4a and 4b is composed of a plurality of columns and beams such as steel frames, and the boiler facility A as a whole. Forms a building. The top girder 3 is composed of a plurality of main top girders 3a and sub top girder 3b connected so as to be orthogonal to each other, and the main top girder 3a extends over the boiler body 1 at the upper part of the support frame 4. And 4b.

  Next, the dismantling method of the boiler equipment A by one Embodiment of this invention is demonstrated. In the present embodiment, first, a beam for suspending the top girder 3 is temporarily installed on the support frame 4. FIG. 2B is a view showing a mode in which a main temporary beam 5 a and a sub temporary beam 5 b (hereinafter, collectively referred to as temporary beam 5) are temporarily installed on the support frame 4. In the case of this embodiment, a plurality of main temporary beams 5a are installed between the column portions 4a and 4b via the horse 5d provided on the top of the column portions 4a and 4b above the top girder 3. Moreover, the sub temporary beam 5b is arrange | positioned 1 each at the right-and-left end part of the main temporary beam 5a on the main temporary beam 5a so as to be orthogonal to this. Each sub-temporary beam 5b is formed with a pair of beam members with a slight gap. When the temporary setting of the temporary beams 5 a and 5 b is completed, the auxiliary temporary beam 5 c is installed on the lower surface of the top girder 3. Next, a descent device for suspending and dropping the top girder 3 from the temporary beam 5 together with the boiler body 1 is installed. In the present embodiment, a suspension member and a jack are assumed as the lowering device. FIG. 3A is a view showing a mode in which the suspension member 6 and the jack 7 are installed. Moreover, FIG.1 (b) is an external appearance perspective view of the boiler equipment A after installing the suspension material 6 and the jack 7. FIG.

  The suspending material 6 is made of, for example, a steel rod, and the jack 7 can be positioned at any position of the suspending material 6 by being locked and released with respect to the suspending material 6 and moves along the suspending material 6. Can do. The jack 7 can be attached to either the temporary beam 5 or the top girder 3, but in this embodiment, the jack 7 is attached to the top girder 3 via the auxiliary temporary beam 5c. In this way, the suspension material 6 can be installed in advance over the required length, and the work of installing the suspension material 6 every time the jack 7 is lowered can be omitted. be able to. A plurality of suspension members 6 are provided, and an upper end portion thereof is attached to the auxiliary temporary beam 5b. As described above, the sub-temporary beam 5b is formed with a pair of beam members with a slight gap, and the upper end portion of the suspension member 6 passes through this gap and protrudes above the sub-temporary beam 5b. It is fixed by a fastener provided on 5b. The suspension member 6 extends downward in the vertical direction through the gaps between the top girders 3, and its lower end is an open end.

  Next, the top girder 3 is separated from the support frame 4 while the jack 7 is locked to the suspension member 6, and the direct support by the support frame 4 is released. FIG. 3B is a view showing a state in which the top girder 3 is separated from the support frame 4. In the case of this embodiment, the top girder 3 and the support frame 4 are separated by cutting both end portions of the top girder 3. By releasing the support, the top girder 3 and the boiler body 1 suspended by the top girder 3 are both suspended from the temporary beam 5 and are indirectly supported by the support frame 4 via the temporary beam 5. Become. Subsequently, by lowering the jack 7, the step of lowering the top girder 3 together with the boiler body 1 and the step of disassembling the boiler body 1 are alternately repeated a plurality of times. Any of these steps may be performed first, but in the present embodiment, it is assumed that the former is performed and then the latter is disassembled. FIG. 4A is a view showing a state in which the top girder 3 is lowered together with the boiler body 1 by jacking down the jack 7. As a result of the jackdown, the jack 7 moves downward along the suspension member 6, and the top girder 3 to which the jack 7 is attached and the boiler body 1 suspended by the jack 7 are lowered accordingly. The amount of descent is determined according to the amount of dismantling of the boiler body 1 that is the next step. FIG. 4B is a view showing a mode in which the boiler body 1 is partially disassembled. As shown in the figure, the boiler body 1 is disassembled sequentially from the bottom. By disassembling while the boiler body 1 is suspended, work efficiency can be improved.

  Hereinafter, as shown in FIGS. 5A to 5D, the lowering of the boiler main body 1 and the top girder 3 and the partial disassembly of the boiler main body 1 are repeatedly performed. After disassembling, the disassembling work of the boiler body 1 is completed as shown in FIG. Thereafter, the support frame 3 is disassembled using a heavy machine or the like, and the dismantling operation of the boiler facility A is completed. Advantages of the disassembling method of the present embodiment implemented in this way are as follows. First, when the boiler main body 1 and the top girder 3 are lowered, they are suspended via the temporary beam 5 and the temporary beam 5 is supported by the support frame 4, so that the boiler main body 1 and the top girder 3 are stably provided. Can descend. At this time, for example, the temporary beam 5 may be supported by the remaining part of the top girder 3 (the part left on the support frame 4 when the top girder 3 is cut). Since restrictions are imposed and a great amount of reinforcement of the support frame 4 is required, workability is improved and a stronger support force can be obtained when the support frame 4 is supported as in this embodiment. . Moreover, since the descent | fall apparatus which consists of the suspension material 6 and the jack 7 can be provided in the arbitrary positions on the temporary beam 5, these can be arrange | positioned corresponding to the load distribution of the boiler main body 1 and the top girder 3. FIG. Therefore, the boiler body 1 and the top girder 3 can be lowered more safely and easily, and various boiler facilities can be handled. Furthermore, the operation of providing the temporary beam 5 is not so laborious, and the temporary beam 5 is excellent in economic efficiency because a general-purpose temporary member such as an H beam is sufficient.

(A) is an external appearance perspective view of the boiler equipment A which is a target example of the dismantling method of this invention, (b) is an external perspective view of the boiler equipment A after installing the suspension material 6 and the jack 7. FIG. (A) is a schematic structural diagram of the boiler facility A, and (b) is a diagram showing a mode in which a main temporary beam 5a and a sub temporary beam 5b are temporarily installed on a support frame 4. (A) is a figure which shows the aspect which installed the suspension material 6 and the jack 7, (b) is a figure which shows the aspect which isolate | separated the top girder 3 from the support frame 4. FIG. (A) is a figure which shows the aspect which lowered | hung the top girder 3 with the boiler main body 1 by jackdown of the jack 7, (b) is a figure which shows the aspect which disassembled the boiler main body 1 partially. (A) thru | or (d) is a figure which shows the operation | work which repeats disassembly and the fall of the boiler main body 1, (e) is a figure which shows the aspect which the disassembly work of the boiler main body 1 was complete | finished.

Explanation of symbols

A Boiler equipment 1 Boiler body 2 Suspension material 3 Top girder 4 Support frame 5 Temporary beam 6 Suspension material 7 Jack

Claims (2)

A boiler body disassembling method comprising a boiler body, a top girder on which the boiler body is suspended, and a support frame that supports the top girder,
A temporary step of temporarily setting a temporary beam for suspending the top girder on the support frame;
An installation step of installing a lowering device for suspending and dropping the top girder from the temporary beam together with the boiler body;
A separation step of separating the top garter from the support frame;
A lowering step of lowering the top girder together with the boiler body by the lowering device, and a dismantling step of disassembling the boiler body, a repetitive step of alternately repeating a plurality of times,
A method for disassembling boiler equipment, comprising: The descent device comprises a suspension material and a jack that moves along the suspension material,
2. The boiler facility disassembly method according to claim 1, wherein in the installation step, an upper end portion of the suspension member is attached to the temporary beam and the jack is attached to the top girder.

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