JPH11270154A - Dismantling method of boiler and boiler shed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dismantling method of a boiler and a boiler shed dispensing with replacement of a jack lowering the boiler and capable of raising working efficiency. SOLUTION: This dismantling method is of such processes as an A process of setting respective jacks 5 on both ends of a regular beam 3 for hanging a boiler 1, a B process of hooking hanging materials 6 extending from the jacks 5 on the regular beam 3, a C process of cutting the regular beam 3 so that the boiler 1 may separate from a boiler shed 2 together with the regular beam 3 portion side where the hanging material 6 extending from the jack 5 is hooked with the regular beam 3 portion side where the jack 5 is set remaining on the boiler shed 2 side, a D process of lowering the boiler 1 together with the regular beam 3 portion side where the hanging material 6 extending from the jack 5 is hooked, an E process of dismantling the lowered boiler 1 from its lower part, and an F process of dismantling the boiler shed 2 from its upper part.

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 boiler installed in, for example, a thermal power plant together with a building in which the boiler is stored.

[0002]

Generally, a large suspended boiler installed in a thermal power plant is dismantled together with the building after the end of its useful life. here,
The disassembly procedure will be briefly described with reference to FIGS. FIG. 12 shows a cross section of the boiler building when the dismantling preparation work is almost completed. As can be seen from the figure, when the dismantling preparation is almost completed, jacks 23 are installed at predetermined intervals on the top girder (main beam) 22 that suspends the boiler 21 (in the figure, three jacks 23 are connected).
Although only the base is shown, in reality, a required number is installed according to the weight of the boiler 21). The wire 24 extending from the jack 23 is connected to the upper end of the boiler 21.

[0003] Once the dismantling preparation is completed as described above,
Then, it moves to the boiler dismantling work. At the time of the main dismantling work, first, a permanent suspension member 25 connecting the boiler 21 and the top girder 22 and a pipe (not shown) connected to the boiler 21 are cut. Next, jack 23
, And the boiler 21 is lowered.

As shown in FIG. 13, when the lower end of the boiler 21 is lowered to near the ground, it is disassembled (cut off) from below. After the boiler 21 is dismantled to some extent, the wire 24 is drawn out from the jack 23 again to lower the boiler 21 and dismantle. Thereafter, the descent and dismantling of the boiler 21 are repeatedly performed. The state in which the boiler 21 is dismantled about half is as shown in FIG.

After the dismantling of the boiler 21 is completed as described above, the boiler building including the top girder 22 is dismantled. In other words, first, the top girder 22 is separated from the boiler building and lowered to the ground. After that, the dismantling of the boiler building is performed one by one from the top. By the way, in such a conventional technique, the top girder 2
Prior to the cutting and descent of Step 2, the jack 23 is replaced, that is, the temporary beam is bridged between the main pillars 26 of the boiler building, the jack 23 is transferred thereto, and the wire extending from the transferred jack 23 is further transferred. 24 top girder 2
It is necessary to perform a troublesome operation such as connecting to the second. Therefore, work efficiency was poor, and this was the cause of prolonged dismantling work.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a boiler and a method for dismantling a boiler building which do not require rearrangement of jacks for lowering the boiler and which can improve work efficiency.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to provide an A step of installing jacks at two ends of a main beam for suspending a boiler, and suspending a hanging member extending from the jack on the main beam. B step, the part side where the jack is installed in the main beam remains on the boiler building side, and the boiler, together with the part side where the hanging member extending from the jack is hooked in the main beam, Step C of cutting the main beam to separate it from the boiler building, and operating the jack to lower the boiler together with the part of the main beam where the hanging member extending from the jack is hooked. A method for dismantling a boiler and a boiler building, comprising: a step D; a step E for disassembling the lowered boiler from below; and a step F for dismantling the boiler building from above. It is solved by.

That is, in the method for dismantling a boiler and a boiler building according to the present invention, two ends of a permanent beam for suspending the boiler are provided with:
After installing jacks and hooking the hanging material extending from this jack to the main beam, the part of the main beam where the jack was installed remains on the boiler building side, and the boiler is removed from the jack at the main beam. The main beam is cut so as to be separated from the boiler building together with the portion where the extending hanging member is hooked, so that the boiler is lowered together with the main beam. Therefore, in the prior art in which the boiler and the permanent beam were separately lowered, the jack was re-arranged, which was indispensable in the prior art, i.e., the temporary beam was bridged between the permanent columns of the boiler building, and then the jack was moved to it. This eliminates the need for a very troublesome operation such as replacement and connection of a hanging member extending from the transferred jack to the main beam. Further, since a part of the main beam (both ends remaining on the boiler building side) is directly used for supporting the jack, a large-scale facility such as a temporary gantry is not required. Therefore, compared with the conventional disassembly method, the working efficiency can be greatly improved, and the construction period can be shortened accordingly.

In the method for dismantling a boiler and a boiler building according to the present invention, the cutting line of the main beam is located on the upper side of the main beam and is located at a position higher than the position where the jack is installed. A point present at a position close to the center, and a lower position on the lower side of the main beam, closer to a joining point between the main beam and the boiler building than a position where a hanging member extending from the jack is hung. A straight line connecting the existing points (or a polygonal line or a curve connecting these two points) can be given.

Further, in order to enhance the stability at the time of descent of the boiler, the jack is provided on the temporary beam placed on the permanent beam so as to be orthogonal to the permanent beam so as to sandwich the permanent beam. It is preferable that two sets are installed for one end of the above. Further, in order to secure the hanging state of the hanging member extending from the jack, a permanent beam receiving member is connected to a lower end portion of the hanging member extending from the jack, and the permanent beam is mounted on the permanent beam receiving member. It is preferable that the hanging member is hung on the main beam by being placed.

In the method for dismantling a boiler and a boiler building according to the present invention, it is preferable that the boiler is lowered and dismantled alternately and repeatedly in order to enhance safety during dismantling work.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A method for dismantling a boiler and a boiler building, which will be described below as an embodiment of the present invention, comprises a step A in which jacks are installed at two ends of a permanent beam for suspending the boiler, respectively. A step B of hanging a hanging member extending from a jack on the main beam; and a portion of the main beam where the jack is installed remains on the boiler building side, and the boiler is connected to the jack on the main beam. A step of cutting the main beam so as to be separated from the boiler building together with the part side on which the hanging member extending from the hook is hung, and operating the jack to move the boiler from the jack at the main beam. A step D for lowering the boiler lowered from the lower part, and a step F for disassembling the boiler building from the upper part. To. In particular, in the present embodiment, the cutting of the main beam is performed on the upper side of the main beam, at a point closer to the center of the main beam than at the position where the jack is installed, and On the lower side of the beam, along the line connecting the point existing at a position closer to the junction between the main beam and the boiler building than the position where the hanging member extending from the jack is hung, did. In addition, two sets of jacks are installed on a temporary beam placed on the main beam so as to intersect the main beam at one end of the main beam so as to sandwich the main beam. ing. Further, a permanent beam receiving member is connected to a lower end portion of the hanging member extending from the jack, and the permanent beam is placed on the permanent beam receiving member so that the hanging member is hung on the permanent beam. Stopped. In the present embodiment, the boiler is lowered and dismantled alternately and repeatedly.

Next, an embodiment of the present invention will be described in more detail with reference to FIGS. 1 is an overhead view of a boiler building with a pair of temporary beams mounted on a top girder, FIG. 2 is a cross-sectional view of a boiler building with a jack installed on the pair of temporary beams, and FIG. FIG. 4 is a plan view of the boiler building in the same state as FIG. 2, FIG. 4 is a cross-sectional view of the boiler building in a state where a top girder receiving member is connected to the lower end of a wire extending from the jack, and FIG. 5 is a line XX in FIG. FIG. 6 is a front view showing a cutting line of the top girder, FIG. 7 is a cross-sectional view of a boiler building in a state where the boiler is lowered by one stage,
8 is a cross-sectional view of the boiler building in a state where the dismantling of the boiler has been completed for one stage, FIG. 9 is a cross-sectional view of the state in which the preparation for dismantling the boiler building is completed, and FIG. FIG.

In the method for dismantling a boiler and a boiler building according to one embodiment of the present invention (hereinafter referred to as the present dismantling method), prior to the main dismantling of the boiler 1 and the boiler building 2, as shown in FIG. The temporary beam pair 4 is placed on a top girder (main beam) 3, in particular, on two ends of the top girder 3. Then, as shown in FIG. 2, a jack 5 is installed on the temporary beam pair 4 (Step A). More specifically, the temporary beam pair 4 is composed of two H-shaped steel members 4 a and 4 b, and is mounted on the top girder 3 so as to be orthogonal to the top girder 3. And FIG.
As can be seen from FIG. 2, two jacks 5 are installed on one end of the top girder 3 so as to sandwich the top girder 3 on the temporary beam pair 4. In this embodiment, since there are four top girders 3 for suspending the boiler 1, a total of 16 jacks 5 are provided.

Once the jack 5 has been installed as described above, the jack 5 is subsequently connected to a wire (suspension member).
6 is set. Then, as shown in FIGS. 4 and 5, the wire 6 extending from the jack 5 is hooked on the top girder 3 (step B). That is, the top girder receiving member (main beam receiving member) 7 is connected to the lower end portion of the wire 6, and the top girder 3 is placed on the top girder receiving member 7. Hang on.

A gap having a width slightly larger than the diameter of the wire 6 is provided between the temporary beam 4a and the temporary beam 4b constituting the temporary beam pair 4. Therefore, the wire 6 protrudes from the bottom surface of the temporary beam pair 4 through this gap, and is connected to the top girder receiving member 7. The above-described installation work of the jack 5, the setting work of the wire 6, and the connecting work of the top girder receiving member 7 are performed by the top girder 3 and the temporary beam pair 4.
By performing at all the intersections with, the dismantling preparation of the boiler and the boiler building is completed.

When the dismantling preparation is completed, the top girder 3 is separated from the boiler building 2 (step C). At this time, the cutting of the top girder 3 is performed along the oblique line L in FIG. 6, that is, the straight line connecting the points Q and Q ′. In other words, the side of the top girder 3 where the jack 5 is installed remains on the boiler building 2 side, and
The boiler 1 is mounted on the boiler building 2 together with the side of the top girder 3 where the wire 6 extending from the jack 5 is hooked.
The top girder 3 is cut so as to separate from the top girder. As a result, the weight of the boiler 1 and the top girder 3 (accurately, the central portion of the top girder 3) is reduced by the jack 5 and the wire 6.
To the rest of the top girder 3.
Furthermore, the weight of the boiler 1 and the top girder 3 is transmitted to the boiler building 2 by the cantilever effect exerted by the remaining part of the top girder 3.

The point Q that determines the oblique line L in FIG. 6 is a point located on the upper side of the top girder 3 and closer to the center of the top girder 3 than the position where the jack 5 is installed. . On the other hand, the point Q ′ is on the lower side of the top girder 3, and the position of the top girder 3 and the boiler building 2 is lower than the position where the wire 6 extending from the jack 5 is hooked (the position where the top girder receiving member 7 abuts). Is a point existing at a position close to the junction point.

When all the top girders 3 are separated from the boiler building 2, the jack 5 is operated to lower the boiler 1 by one stage (step D). At this time, the portion where the wire 6 extending from the jack 5 is hooked on the top girder 3 descends together with the boiler 1 as can be seen from FIG. When the state shown in FIG. 7 is obtained, the boiler 1 is disassembled from below (step E). The state where the dismantling of the boiler 1 has been completed for one stage is as shown in FIG.

After that, the descent and the dismantling of the boiler 1 are performed by one.
What is necessary is just to carry out alternately and repeatedly for each step, and when the dismantling of the boiler 1 is completed, that is, when the preparation for dismantling the boiler building 2 is completed, the state shown in FIG. 9 is obtained. Although the removal of the pair of temporary beams 4 and the jack 5 has not been particularly described, these operations are performed in parallel with the final dismantling operation of the boiler 1.

When the state shown in FIG. 9 is obtained,
Next, the boiler building 2 is dismantled from above (F step). The state in the middle of dismantling of the boiler building is as shown in FIG. 10, and the remaining part is further dismantled and removed from this state, and the dismantling of the boiler 1 and the boiler building 2 is completed. As described above, in the present embodiment, jacks 5 are respectively installed at two ends of the top girder 3 for suspending the boiler 1, and a wire 6 extending from the jack 5 is hung on the top girder 3. 3, the side where the jack 5 is installed remains on the boiler building 2 side, and the boiler 1 is separated from the boiler building 2 together with the side where the wire 6 extending from the jack 5 is hooked on the top girder 3. By cutting the girder 3, the boiler 1
With the top girder 3. Therefore, in the prior art, in which the boiler and the top girder were separately lowered, the jack was re-arranged, which was indispensable in the prior art. In addition, it is not necessary to perform a very troublesome operation such as connecting a suspension member extending from the transferred jack to the top girder. In addition, since a portion of the top girder 3 (both ends remaining on the boiler building 2 side) is directly used for supporting the jack 5, large-scale equipment such as a temporary gantry is not required. Therefore, compared with the conventional disassembly method, the working efficiency can be greatly improved, and the construction period can be shortened accordingly.

It should be noted that the present invention is not limited to the above embodiment, and can be appropriately changed within the scope of the technical idea. For example, the cutting of the top girder may be performed not only along an oblique straight line but also along other lines. An example is shown by a solid line in FIG.
The top girder 13 on which the temporary beam pair 11 and the jack 12 are installed is cut along a crank-shaped line L 'connecting the points R and R'. On the other hand, another example of the top girder cutting line is indicated by a broken line in FIG. Even when the top girder 13 is cut along the broken line L ′ or the curve L ″, the same effects as those of the previous embodiment can be obtained.

[0023]

According to the present invention, it is not necessary to change the jack for lowering the boiler, and the efficiency of dismantling the boiler and the boiler building can be improved.

[Brief description of the drawings]

FIG. 1 is an overhead view of a boiler building with a pair of temporary beams mounted on a top girder (this embodiment).

FIG. 2 is a cross-sectional view of the boiler building with a jack installed on a pair of temporary beams (this embodiment).

FIG. 3 is a plan view of the boiler building in the same state as in FIG. 2 (this embodiment).

FIG. 4 is a sectional view of the boiler building in a state where a top girder receiving member is connected to a lower end portion of a wire extending from a jack (this embodiment).

5 is a cross-sectional view taken along line XX in FIG. 4 (this embodiment).

FIG. 6 is a front view showing a cutting line of the top girder (this embodiment).

FIG. 7 is a sectional view of the boiler building in a state where the boiler is lowered by one stage (this embodiment).

FIG. 8 is a cross-sectional view of the boiler building in a state where the dismantling of the boiler has been completed for one stage (this embodiment).

FIG. 9 is a cross-sectional view of the boiler building in a state where preparation for disassembly is completed (this embodiment).

FIG. 10 is a sectional view of the boiler building in a state of being dismantled (this embodiment).

FIG. 11 is a front view showing a cutting line of the top girder (other embodiment).

FIG. 12 is a cross-sectional view of a boiler building in a state where dismantling preparation work is almost completed (conventional form).

FIG. 13 is a cross-sectional view of the boiler building in a state where the lower end of the boiler is lowered to near the ground surface (conventional form).

FIG. 14 is a sectional view of a boiler building in a state where the boiler is disassembled about half (conventional form).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Boiler 2 Boiler building 3 Top girder (main beam) 4 Temporary beam pair 5 Jack 6 Wire (hanging material) 7 Top girder receiving material (main beam receiving material)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Koji Endo Inventor Taisei Construction Co., Ltd. 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo

Claims (5)

[Claims] A step of installing jacks at two ends of a main beam for suspending a boiler; a step B of hanging a suspending member extending from the jack on the main beam; The part where the jack is installed is left on the boiler building side, and the boiler is separated from the boiler building together with the part where the hanging member extending from the jack is hooked on the permanent beam. A step C for cutting the installation beam; a step D for operating the jack to lower the boiler together with a portion of the main beam where the hanging member extending from the jack is hooked; and a step B for lowering the boiler. And a method for dismantling the boiler building, comprising: an E step of dismantling the boiler building from below, and an F step of dismantling the boiler building from above. 2. A point on the upper side of the main beam, which is closer to the center of the main beam than the position where the jack is installed, and on the lower side of the main beam, Cutting the main beam along a line connecting the main beam and a point present at a position closer to a junction between the boiler building and the position where the hanging member extending from the jack is hung, The method for dismantling a boiler and a boiler building according to claim 1. 3. A pair of jacks is provided on a temporary beam placed on the main beam so as to be orthogonal to the main beam and one end of the main beam is sandwiched between the temporary beams. The method for dismantling a boiler and a boiler building according to claim 1 or 2, wherein the boiler building is dismantled. 4. A permanent beam receiving member is connected to a lower end of a suspending member extending from a jack, and the permanent beam is placed on the permanent beam receiving member, whereby the suspending member is connected to the main beam. The method for dismantling a boiler and a boiler building according to any one of claims 1 to 3, wherein the boiler and the boiler building are disassembled. 5. The method for dismantling a boiler and a boiler building according to claim 1, wherein the descending and dismantling of the boiler are alternately repeated.