JP2009287371A - Demolition method for boiler and boiler building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a demolition method for a boiler and a boiler building, which enables boiler dismantling operations to be performed on the ground or in a low place near the ground, without being performed in a high place, which prevents the boiler from falling due to the weight of the ceiling beam, the boiler, etc., suspended by a jack, which facilitates ceiling beam cutting work, which can avoid collapse, caused by the deflection of the boiler building during earthquakes, by virtue of excellent earthquake resistance, and which dispenses with a step of cutting a connecting material for connecting the ceiling beam and the boiler together. <P>SOLUTION: In a ceiling section of the boiler building 1, a temporary beam 3 is laid and placed between permanent columns of the boiler building 1, and fixed onto the permanent columns. A jack 5 is provided at a predetermined position of the temporary beam 3. A hanging member 7 of the jack 5 is latched to the ceiling beam 6. The ceiling beam 6 is separated from the boiler building 1 by cutting both ends of the ceiling beam 6. The ceiling beam 6 and the boiler 4 are lowered by paying out the hanging member 7 from the jack 5, and stopped for the dismantlement of the boiler 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method of dismantling a boiler such as a thermal power plant together with a boiler building in which the boiler is stored, and more particularly to a method of excellent earthquake resistance.

  Generally, a suspended boiler is installed as a large boiler used in a thermal power plant or the like. The suspended boiler will be demolished together with the boiler building after the end of its useful life. The boiler building has a ceiling beam for suspending the boiler at an upper portion thereof, and the boiler is suspended from the ceiling beam by a connecting material for connecting the ceiling beam and the boiler in the boiler building.

  The conventional boiler disassembly procedure is as follows.

  First, a jack is installed on the ceiling beam that forms the upper part of the boiler building. Then, the suspension material suspended from the jack is connected to the upper end portion of the boiler to suspend the boiler, and then the connection material connecting the ceiling beam and the boiler is cut to separate the boiler from the ceiling beam. . At this time, cut all the pipes and ducts connected to the boiler. Next, the jack is operated to gradually feed the suspension material from the jack to lower the boiler by a predetermined distance and then stop. After stopping, dismantle part of the boiler (from the bottom). Thereafter, the boiler is repeatedly lowered, stopped and dismantled. After the boiler dismantling is completed in this way, the boiler building is dismantled including the removal of the ceiling beams and jacks (hereinafter referred to as “prior art 1”).

  Prior art 1 includes a step of cutting a connecting material connecting the ceiling beam and the boiler. However, this is a daunting task. Furthermore, the cutting work of the connecting material is a work at a high place in the upper part of the boiler building, which is about 50 m high, and has a problem with danger. In view of such a problem, Patent Document 1 is disclosed as a method of disassembling a boiler without separating the ceiling beam and the boiler. The construction method of Patent Document 1 is as follows. FIG. 9 is an explanatory diagram showing the construction method disclosed in Patent Document 1. As shown in FIG.

  First, the temporary beam pair 43 is placed on the ceiling beam (top girder) 46 of the boiler building 41. A jack 45 is provided on the temporary beam pair 43. A receiving member (holding portion) 48 at the tip of the suspension member 47 of the jack 45 is hooked on the ceiling beam 46. A boiler 44 is connected under the ceiling beam 46. Next, the ceiling beam 46 is cut so that the jack 45 and the temporary beam pair 43 remain on the boiler building 41 side. Then, the cut ceiling beam 46 and the boiler 44 are lowered by a predetermined distance from the ceiling beam 46a remaining on the boiler building 41 side by feeding the suspension material 47 of the jack 45, and then stopped. The stopped boiler 44 is disassembled from below. Thereafter, the boiler is repeatedly lowered, stopped and dismantled. In this way, the boiler is dismantled. The boiler building is demolished from the top.

Japanese Patent Laid-Open No. 11-270154

  As described above, the dismantling method of Patent Document 1 has an advantage of not requiring a step of separating the ceiling beam and the boiler. However, since the temporary beam pair 43 provided with the jack is placed on the ceiling beam 46a remaining on the boiler building 41 side, the temporary beam pair 43 and the jack 45 remain on the ceiling beam 46 remaining after cutting the ceiling beam 46. It exists on 46a. Therefore, after cutting the ceiling beam 46, the total weight of the ceiling beam 46, the boiler 44, the jack 45, and the temporary beam pair 43 is loaded on the remaining ceiling beam 46a. This places a considerable load on the remaining ceiling beam 46a and the boiler building 41 that supports the ceiling beam 46a, and in particular, the connection portion between them, and the remaining ceiling beam 46a falls off the boiler building 41 and the boiler 44 falls during construction. There is danger.

  There is also a problem in cutting the ceiling beam 46. That is, after the ceiling beam 46 is cut, the temporary beam pair 43 and the jack 45 remain on the boiler beam side ceiling beam 46a remaining after the cutting. It must be carried out so that the lower end of the suspension member 47 is in a positional relationship that allows the receiving member 48 of the ceiling beam 46 to be hooked (leaving the inner portion of the ceiling beam 46 that is a connecting portion with the boiler 44), For this purpose, it is necessary to arrange the position of the jack 45 on the ceiling beam 46 and the position of the latching position (receiving material 48) of the ceiling beam 46 at the lower end of the suspension material 47 on the same vertical line. There is considerable difficulty in construction (see the ceiling beam 46 and the remaining cut of the ceiling beam 46a in FIG. 9).

  Furthermore, if the temporary beam is placed on the ceiling beam and the ceiling beam is cut, the inside of the ceiling beam will come off, and the boiler building that supports the boiler from both sides may be bent and collapsed from both sides, which is dangerous. The construction period is several months, and damage occurs when an earthquake occurs.

  Therefore, the object of the present invention is to perform the dismantling work of the boiler at the ground or at a low place near it without performing it at a high place, and without the boiler falling due to the weight of the ceiling beam and the boiler suspended by the jack. , Ceiling beam cutting work is not difficult, it has excellent earthquake resistance, can avoid collapse due to the bending of the boiler building during the earthquake, and does not require the cutting process of the connecting material that connects the ceiling beam and the boiler It is to provide a demolition method for boilers and boiler buildings.

  The present invention has the following features in order to solve the above problems.

[1] In the method of disassembling the boiler suspended from the ceiling beam of the boiler building together with the boiler building, the temporary beam is placed between the main pillars of the boiler building and placed on the ceiling of the boiler building. Then, it is fixed on the main pillar, a jack is provided at a predetermined position of the temporary beam, a suspension material of the jack is hooked on the ceiling beam, and then both ends of the ceiling beam are cut to cut the ceiling beam The ceiling beam and the boiler suspended by the jack by separating from the boiler building are lowered by a predetermined distance by feeding the suspension material from the jack, and stopped. Dismantling a part of the stopped boiler, and then lowering and stopping the ceiling beam and the boiler, and dismantling the stopped boiler Ri returns, thus, characterized in that it comprises the complete boiler dismantling step dismantling of the boiler, boiler and demolishing method boiler building.

[2] A seismic jack is provided on the lower end of the main pillar or on the ground near the lower end, and the suspension member of the seismic jack is sandwiched between the main pillar provided with the seismic jack and the boiler. Fixing to the end of the ceiling beam located on the upper side of the main pillar on the opposite side, winding the suspension material with the earthquake-resistant jack and pulling the ceiling beam, thus preventing the boiler building from shaking 1] The method for dismantling the boiler and the boiler building described in [1].

  Since the temporary beam provided with the jack is placed on the ceiling of the boiler building, not on the ceiling beam, and is placed between the main columns, the load on the ceiling beam and the boiler can be supported by the boiler building.

  The ceiling beam that is hooked on the jack is separated from the boiler building, and the ceiling beam is cut at both ends so that the hanging point of the suspension material can be separated from the boiler building. Work becomes easier. Further, the cutting can be performed in the vertical direction, and a horizontal force during the cutting and after the cutting can be supported by giving the cut end a width.

  Since the ceiling beam is suspended together with the boiler by the jack provided on the temporary beam, it is not necessary to separate the ceiling beam and the boiler. Therefore, it is not necessary to cut the connecting material that connects the ceiling beam and the boiler.

  Since the temporary beam is spanned between the main pillars and placed on the ceiling of the boiler building, the temporary beam exists between the boiler buildings on the left and right sides after the ceiling beam is cut, and the boiler beam is being disassembled. The boiler building does not flex and the boiler building does not collapse due to the earthquake.

  Since the boiler building is supported by the earthquake-resistant jack, the boiler building can be prevented from shaking and the earthquake-proofing measures become stronger.

  Embodiments of the present invention will be described with reference to the drawings.

  1 to 8 are drawings according to an embodiment of the present invention. FIG. 1 is a plan view of a boiler and a boiler building showing a state where preparation for dismantling of the boiler is completed, and FIG. 2 is an AA view of FIG. 3 is a sectional view showing the lower part of the boiler building, FIG. 4 and FIG. 5 are diagrams for explaining the boiler dismantling process, (a) is a sectional view, (b) is a front view, and FIGS. FIG. 8 is a plan view showing a temporary beam, and FIG. 8 is a side view showing a cut portion of the ceiling beam.

  First, an operation for preventing the boiler building from shaking will be described.

  As shown in FIGS. 3 to 5, an earthquake-resistant jack 10 is provided on the ground portion in the vicinity of the lower end portion of the main pillar 2 constituting the boiler building 1. The earthquake-resistant jack 10 is provided in four places. The tip of the suspension member 11 of the provided jack 10 is fixed to the end portion of the ceiling beam 6 positioned on the upper side of the main column 2 on the opposite side across the boiler column 4 and the main column 2 provided with the jack 10. Reference numeral 12 shown in FIGS. 1 and 2 denotes a fixed portion at the tip of the suspension member 11 at the end of the ceiling beam 6. The suspension material 11 is a strand (strand) from PC steel. Then, the suspension material 11 is wound up and tensioned by the earthquake-resistant jack 10 and the ceiling beam 6 is pulled. By pulling the ceiling beam 6 with the earthquake-resistant jacks 10 provided in four places in this way, the boiler building 1 is prevented from shaking. This operation can be omitted depending on the situation of the boiler building.

  Next, the boiler disassembly process will be described.

  As shown in FIGS. 4 and 5, the boiler 4 is suspended from a ceiling beam 6 provided horizontally on the upper portion of the boiler building 1 by a connecting material. As shown in FIG. 1, among the plurality of permanent pillars 2 constituting the boiler building 1, the temporary beams 31 a are placed between the permanent pillars 21 a and 22 a, and the temporary beams 31 a are It fixes on the main pillars 21a and 22a. Reference numeral 9 denotes a joint for connecting the temporary beam 3. Further, the main columns 21b to 21d in the row of the main columns 21a (vertical column in FIG. 1) and the main columns 22b to 22d in the column of the main columns 22a (vertical column in FIG. 1). In the meantime, the temporary beams 31b to 31d are mounted, and the temporary beams 31b to 31d are fixed on the main columns 21b to 21d and 22b to 22d, respectively.

  Next, jacks 5 (51a to 51d, jacks 52a to 52d) are provided at both ends of the temporary beam 3 (31a to 31d), respectively. As shown in FIG. 6, the temporary beam 3 includes a bifurcated key-shaped portion 3 a at an end portion where the jack 5 is arranged, and the main body 3 b is one row (one). FIG. 7 shows another embodiment of the temporary beam, and the temporary beam 3 is composed of two rows (two). According to the temporary beam 3 of FIGS. 6 and 7, it can be installed with one jack 5 with respect to the suspension point. According to the temporary beam 3 shown in FIG. 6, the main body 3b needs only one row.

  As shown in FIG. 2, the suspension member 7 extending from the jack 5 has a receiving member 8 for hooking the ceiling beam 6 at its tip. The suspension material 7 is a strand (strand) from PC steel.

  Next, the suspension member 7 is unwound from the jack 5 and hooked to the ceiling beam 6 via the receiving member 8. Thereby, the boiler 4 connected to the lower part of the ceiling beam 6 can be suspended by the jack 5. The number of temporary beams 3 and the number of jacks 5 are determined by the weight of the suspended object, that is, the ceiling beam 6 and the boiler 4, and the allowable load of the jack 5. In the present embodiment, four temporary beams 3 (3a to 3d) and eight jacks 5 (51a to 51d and 52a to 52d) are provided. Loads on the ceiling beam 6 and the boiler 4 suspended by the jack 5 are applied to the temporary beam 3 and the boiler building 1.

  Next, as shown in FIG. 4, the ceiling beam 6 can be separated from the boiler building 1 together with the portion where the hanging material 7 is hooked while the ceiling beam 6 is hooked by the hanging material 7 drawn out from the jack 5. Both end portions of the ceiling beam 6 are cut in the vertical direction as shown by the cutting portions 13 in FIGS. The cutting is performed in the vertical direction as described above, and the cutting unit 13 gives the cut end a width as shown in FIG. It is a so-called width cut. By cutting in the vertical direction, cutting is easy, and by giving the width, the ceiling beam 6 to be cut can be given a horizontal force, so that the cutting work is stable and the work is easy. The ceiling beam 6 and the boiler building 1 are separated by cutting both ends of the ceiling beam 6, and the ceiling beam 6 and the boiler 4 separated from the boiler building 1 are placed on the main pillar 2 of the boiler building 1. The jack 5 installed on the temporary beam 3 is suspended.

  Next, as shown in FIG. 5, the suspension member 7 is fed out from the jack 5, the ceiling beam 6 and the boiler 4 are lowered, and stopped when lowered by a predetermined distance. The stop position is a height at which a part (lower part) of the boiler 4 can be dismantled on the ground by an operator or the like. A part (lower part) of the boiler 4 stopped at this height is decomposed at a predetermined altitude. And dismantling is once stopped. Thus, according to the present invention, the boiler disassembly work can be performed on the ground or in a low place close to it, so that the work efficiency is high and safe.

  Further, the suspension member 7 is again fed out from the jack 5, and the ceiling beam 6 and the boiler 4 are further lowered by a predetermined distance and stopped. Then, again, a part of the boiler 4 (from the lower part) is decomposed at a predetermined altitude at the stopped height.

  Thus, the boiler 4 is entirely disassembled by repeatedly hanging and stopping the ceiling beam 6 and the boiler 4 and disassembling the stopped boiler 4.

  When the dismantling process of the boiler 4 is completed, the temporary beam 3, the jack 5 and the jack 10 are removed and the ceiling beam 6 is removed, and the boiler building 1 is dismantled to complete the dismantling of the entire boiler building.

  As described above, the present invention does not place the temporary beam on the ceiling beam as in Patent Document 1, but places the temporary beam on the main column, so that the ceiling beam and the boiler The load can be supported by the boiler building.

  Moreover, this invention leaves the part side in which the jack of the ceiling beam was installed in the boiler building side like patent document 1, and a boiler is from a boiler building with the part side by which the suspension material extended from a jack was hooked. A complicated cutting work process such as cutting the ceiling beam so as to be separated is unnecessary, and the cutting work is easy because the ceiling beam may be cut so that the ceiling beam is separated from the boiler building.

  Further, in Patent Document 1, as shown in FIG. 9, the ceiling beam 46 must be cut, so that the ceiling beam 46 is pulled out, and the boiler building is inward from both sides (from left and right sides in FIG. 9). In particular, when an earthquake occurs during dismantling (dismantling work takes one to several months), there is a risk of collapse due to this bending. In the present invention, since the boiler building is not hollowed out by placing and fixing temporary beams between the main columns of the ceiling of the boiler building, the boiler building is not bent and the risk of collapse is avoided. . Furthermore, by supporting the boiler building with the above-described earthquake-resistant jack, the boiler building can be prevented from shaking, and the earthquake-proofing measures become stronger.

It is a top view of the boiler building which shows the state which has arranged the temporary beam and jack which concern on embodiment of this invention. It is the sectional view on the AA line of FIG. 1 which concerns on embodiment of this invention. It is sectional drawing which shows the lower part of the boiler building which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS (a) is sectional drawing and (b) is a front view explaining the dismantling process of the boiler which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS (a) is sectional drawing explaining the disassembly process of the boiler which concerns on embodiment of this invention, (b) is a front view. It is a top view which shows the temporary beam which concerns on embodiment of this invention. It is a top view which shows the temporary beam which concerns on embodiment of this invention. It is a side view which shows the cutting part of the ceiling beam which concerns on embodiment of this invention. It is explanatory drawing which shows the construction method disclosed by patent document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Boiler building 2, 21, 22 Main pillar 3,31 Temporary beam 4 Boiler 5,51,52 Jack 6 Ceiling beam 7 Suspension material 8 Receiving material 9 Joint 10 Seismic jack 11 Suspension material 12 Suspension material fixing part 13 Cutting part 41 Boiler building 43 Temporary beam pair 44 Boiler 45 Jack 46, 46a Ceiling beam 47 Suspension material 48 Receiving material

Claims (2)

  In the method of disassembling a boiler suspended from a ceiling beam of a boiler building together with the boiler building, a temporary beam is placed between the main pillars of the boiler building and placed on the ceiling of the boiler building, and the book Fixing on a pillar, providing a jack at a predetermined position of the temporary beam, hooking the suspension material of the jack on the ceiling beam, then cutting both ends of the ceiling beam to attach the ceiling beam to the boiler The ceiling beam and the boiler, which are separated from the building and suspended by the jack by separation from the boiler building, are lowered by a predetermined distance by paying out the suspension material from the jack, and then stopped and stopped. Dismantle a part of the boiler, then repeat the descent and stop of the ceiling beam and the boiler, and the dismantling of the stopped boiler Thus, characterized in that it comprises the complete boiler dismantling step dismantling of the boiler, boiler and demolishing method boiler building.   A seismic jack is provided at the lower end of the main pillar or the ground portion near the lower end, and the suspension member of the seismic jack is provided on the opposite side of the main pillar provided with the seismic jack and the boiler. 2. The apparatus according to claim 1, wherein the ceiling beam is fixed to an end portion of the ceiling beam located at an upper portion of a main pillar, and the suspension material is wound up by the earthquake-resistant jack to pull the ceiling beam, thereby preventing the boiler building from shaking. Demolition method for boilers and boiler buildings.

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