JP2014047936A - Decomposition method of boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a decomposition work period of a boiler and also reduce a decomposition work cost of the boiler by applying reinforcement of a boiler building as less as possible.SOLUTION: There is provided a method for decomposing a boiler 3 in which a temporary beam 4 having a suspension jack 5 mounted therein is bridged between a pair of top parts of permanent columns 1A constituting a boiler building 1, a ceiling beam 2 having the boiler 3 hung therefrom bridged between the upper parts of a pair of permanent columns 1A below the temporary beam 4 is cut away from the pair of permanent columns 1A, the ceiling beam 2 and the boiler 3 are integrally hung down to a ground surface by a suspension jack 5 and after the lower part of the boiler 3 is decomposed, the ceiling beam 2 and the boiler 3 are hung down again integrally to the ground surface, then an operation for decomposing a next lower part of the boiler 3 is repeated to decompose the boiler 3, the lower end of a reinforcement strand 7 is fixed to the ground surface or a column leg of the lower corner part of the permanent column 1A through a hydraulic pressure jack 8 having a vibration control damper function and the upper end of the reinforcement strand 7 is fixed to the upper part of the permanent column 1A.

Description

  The present invention relates to a boiler dismantling method, in particular, a boiler dismantling that can shorten the boiler dismantling period and reduce the boiler dismantling cost by minimizing the reinforcement of the boiler building that is performed at the time of boiler dismantling. It is about the method.

  For example, a boiler installed in a thermal power plant is a suspended boiler. A suspended boiler is a boiler suspended from a ceiling beam installed in a boiler building.

  An example of a method for dismantling such a suspended boiler is disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2009-287371). Hereinafter, this boiler disassembly method is referred to as a conventional disassembly method and will be described with reference to the drawings.

  FIG. 7 is a front view showing a boiler building before dismantling a boiler in which a temporary beam, a suspension jack, and a reinforcing strand are installed by a conventional dismantling method, and FIG. 8 shows a temporary beam, a suspension jack, and FIG. 9 is a side view showing a boiler building before dismantling a boiler in which reinforcing strands are installed. FIG. 9 is a plan view showing a boiler building before dismantling a boiler in which temporary beams, suspension jacks, and reinforcing strands are installed by a conventional dismantling method. 10 is a partially enlarged view of FIG. 7, FIG. 11 is an enlarged sectional view taken along line AA of FIG. 7, and FIG. 12 is a front view showing a state in which the lower part of the boiler is disassembled by a conventional disassembly method. These are side views which show the state which demolished the lower part of the boiler by the conventional dismantling method.

  7 to 11, reference numeral 21 denotes a boiler building constructed of steel frames. The boiler building 21 includes a pair of main pillars 21 </ b> A that are vertically constructed with a space therebetween. 22 is a ceiling beam horizontally stretched between upper portions of a pair of permanent columns 21A below a temporary beam, which will be described later, and 23 is a boiler suspended from the ceiling beam 22 between a pair of permanent columns 21A. , 24 are temporary beams stretched between the tops of the pair of main pillars 21A. The temporary beam 24 is installed above the ceiling beam 22 in parallel with the ceiling beam 22.

  Reference numeral 25 denotes a suspension jack installed on the temporary beam 24. The suspension jack 25 is, for example, a hydraulic jack disclosed in Patent Document 2 (Japanese Patent No. 2828430), and has a function of lifting and lowering heavy objects by intermittently lifting or lowering the suspension strand 26. have. The suspension strand 26 passes through the temporary beam 24 and is fixed to the ceiling beam 22.

  Reference numeral 27 denotes a reinforcing strand. As shown in FIG. 9, a pair of reinforcing strands 27 are stretched across the front and back surfaces of the boiler building 21, and the pair of reinforcing strands 27 are stretched across each other. The upper end of the reinforcing strand 27 is fixed to one end of the ceiling beam 22, and the lower end of the reinforcing strand 27 is fixed to the ground at the lower corner portion of the main column 21 </ b> A via an earthquake resistant jack 28. Both the suspension strand 26 and the reinforcing strand 27 are made of PC steel wire. The reinforcing strand 27 suppresses the swinging of the suspended load, that is, the ceiling beam 22 and the boiler 23 due to an earthquake or the like that occurs during the dismantling of the boiler, and the function of suppressing the swing of the boiler building 21, that is, the boiler building 21 Has the function of improving earthquake resistance.

  Next, a boiler disassembly method by a conventional disassembly method will be described.

  First, the reinforcing strands 27 are crossed and stretched across the front and back surfaces of the boiler building 21 via the earthquake-resistant jacks 28, and the temporary beams 24 are stretched between the tops of the pair of main columns 21A. A suspension jack 25 is installed.

  When the reinforcing strand 27, the temporary beam 24, and the suspension jack 25 are thus installed, both ends of the ceiling beam 22 are cut to separate the ceiling beam 22 from the boiler building 21. As a result, the ceiling beam 22 and the boiler 23 are suspended by the suspension strand 26 of the suspension jack 25 installed on the temporary beam 24.

  When the ceiling beam 22 is separated from the boiler building 21, as shown in FIGS. 12 and 13, the suspension jack 25 is operated, and the boiler 23 is suspended together with the ceiling beam 22 until the lower surface of the boiler 23 lands on the ground. Lower. When the boiler 23 is suspended to the ground, the lower part of the boiler 23 is disassembled, and the dismantled material is removed outside the boiler building 21. Then, after the removal, the boiler 23 is suspended again to the ground, and the next lower part of the boiler 23 is disassembled and removed. At this time, as the disassembly of the boiler 23 proceeds, the ceiling beam 22 descends, so that the reinforcing strand 27 is re-stretched accordingly.

  If the above operation is repeated, all the boilers 23 can be disassembled.

JP 2009-287371 A Japanese Patent No. 2828430

  According to the above-described conventional dismantling method, the boiler 23 can be easily disassembled by stretching the temporary beam 24 provided with the suspension jacks 25 between the tops of the pair of permanent columns 21A. Moreover, by reinforcing the boiler building 21 with the reinforcing strands 27, the earthquake resistance of the boiler building 21 can be improved, but there are the following problems.

  (1) Since the reinforcing strand 27 is stretched between the boiler building 21 and the ceiling beam 22 separated from the boiler building 21, it cannot be expected to significantly improve the earthquake resistance of the boiler building 21 against a large earthquake. . Therefore, in order to significantly improve the earthquake resistance of the boiler building 21, further reinforcement is required.

  (2) Since it is necessary to re-strengthen the reinforcing strand 27 as the boiler 23 is disassembled, it takes time and effort.

  Accordingly, an object of the present invention is to minimize the reinforcement of the boiler building that is performed when the boiler is dismantled, thereby shortening the boiler dismantling period and reducing the dismantling cost of the boiler, and further strengthening the reinforcement strands. It is an object of the present invention to provide a boiler disassembling method that does not require repair, and that can shorten the dismantling period of the boiler.

  The present invention has been made to achieve the above object, and is characterized by the following.

  The invention according to claim 1 is characterized in that a temporary beam provided with a suspension jack is stretched between the tops of a pair of main pillars constituting a boiler building, which is reinforced by reinforcing strands stretched across. The ceiling beam suspended between the upper part of the pair of permanent columns below the temporary beam and suspended from the boiler is separated from the pair of permanent columns, and the ceiling beam is separated by the suspension jack. And the boiler are integrally suspended to the ground, the lower part of the boiler is disassembled, and then the ceiling beam and the boiler are integrally suspended to the ground, and the next lower part of the boiler is disassembled. In the method of dismantling the boiler by repeatedly performing the operation, the lower end of the reinforcing strand is connected to the ground or the column at the lower corner portion of the main column via a hydraulic jack device having a damping damper function. Fixed to, and it has the characteristics to fix the upper end of the reinforcing strands in the upper portion of the present 設柱.

  According to a second aspect of the present invention, in the first aspect of the invention, the hydraulic jack device includes a jack main body, an accumulator, a pilot check valve provided with a throttle valve, and a check valve connected in parallel. A control valve, and when a pulling force acts on the reinforcing strand, the pressure on the push side of the jack body rises and the pilot check valve opens, and oil passes through the throttle valve. Thus, the tensile force acting on the reinforcing strand is absorbed, and the oil flows into the pull side of the jack body and the accumulator.

  According to the present invention, the following effects are brought about.

  (A) As a result that the boiler building can be provided with a vibration damping function by crossing the reinforcing strand across the boiler building via a hydraulic jack device having a vibration damping damper function, the boiler that is enforced when the boiler is disassembled Building reinforcement can be minimized.

  (B) By crossing and stretching the reinforcing strands across the boiler building, it is not necessary to re-stretch the reinforcing strands as the boiler is dismantled.

  (C) The reinforcing strand is stretched on the boiler building via a hydraulic jack device including a jack body, an accumulator, and a flow rate control valve in which a pilot check valve provided with a throttle valve and a check valve are connected in parallel. By passing, since the seismic energy is reliably absorbed by the hydraulic jack device, the seismic effect of the boiler building is improved.

It is a front view which shows the boiler building before the boiler dismantling by which temporary beam, the jack for suspension, and the reinforcement strand were installed by this invention. It is a top view which shows the boiler building before the boiler dismantling by which temporary beam, the suspension jack, and the reinforcement strand were installed by this invention. It is the elements on larger scale of FIG. It is a front view which shows the state which demolished the lower part of the boiler by this invention. It is explanatory drawing of the damping function by a hydraulic jack apparatus. It is a block diagram of a hydraulic jack apparatus. It is a front view which shows the boiler building before the boiler demolition in which the temporary beam, the jack for suspension, and the reinforcement strand were installed by the conventional dismantling method. It is a side view which shows the boiler building before the boiler demolition in which the temporary beam, the jack for suspension, and the reinforcement strand were installed by the conventional dismantling method. It is a top view which shows the boiler building before the boiler dismantling in which the temporary beam, the suspension jack, and the reinforcement strand were installed by the conventional dismantling method. It is the elements on larger scale of FIG. It is an AA line expanded sectional view of FIG. It is a front view which shows the state which demolished the lower part of the boiler with the conventional dismantling method. It is a side view which shows the state which demolished the lower part of the boiler with the conventional dismantling method.

  An embodiment of the boiler disassembling method of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view showing a boiler building before dismantling a boiler in which temporary beams, suspension jacks and reinforcing strands are installed according to the present invention, and FIG. 2 shows temporary beams, suspension jacks and reinforcement according to the present invention. The top view which shows the boiler building before the boiler dismantling in which the strand was installed, FIG. 3 is the elements on larger scale of FIG.

  In FIG. 1 to FIG. 3, reference numeral 1 denotes a boiler building constructed of steel frames. The boiler building 1 is provided with a pair of main pillars 1A that are vertically constructed with a gap therebetween. 2 is a ceiling beam horizontally stretched between upper portions of a pair of permanent columns 1A below a temporary beam 4 described later, and 3 is suspended from the ceiling beam 2 between a pair of permanent columns 1A. A boiler (including a boiler body and a surrounding steel frame) 4 is a temporary beam stretched between the tops of a pair of main pillars 1A. The temporary beam 4 is installed above the ceiling beam 2 in parallel with the ceiling beam 2.

  Reference numeral 5 denotes a suspension jack installed on the temporary beam 4. The suspension jack 5 is, for example, a hydraulic jack disclosed in Patent Document 2 (Japanese Patent No. 2828430), and has a function of lifting and lowering heavy objects by intermittently lifting or lowering the suspension strand 6. have. The suspension strand 6 passes through the temporary beam 4 and is fixed to the ceiling beam 2.

  7 is a reinforcing strand. As shown in FIG. 2, a pair of reinforcing strands 7 are stretched across the front and back surfaces of the boiler building 1, and the pair of reinforcing strands 7 are stretched across each other. The upper end of the reinforcing strand 7 is fixed to the upper portion of the main column 1A, and the lower end of the reinforcing strand 7 is connected to the ground or the column base of the lower corner portion of the main column 1A via a hydraulic jack device 8 described later. It is fixed. Both the hanging strand 6 and the reinforcing strand 7 are made of PC steel wire. The reinforcing strand 7 has a function of suppressing the shaking of the boiler building 1 due to an earthquake or the like that occurs during boiler dismantling, that is, a function of improving the earthquake resistance of the boiler building 1.

  In addition, as shown in FIG. 1, when the upper end of the reinforcing strand 7 is fixed to the upper inside of the main column 1A, if the corner portion of the main column 1A is reinforced by the reinforcing material 9, the main column 1A is provided. The strength of is further increased.

  Next, the hydraulic jack device 8 will be described with reference to the drawings.

  FIG. 5 is an explanatory diagram of the vibration damping function of the hydraulic jack device, and FIG. 6 is a configuration diagram of the hydraulic jack device.

  As shown in FIG. 5, a pair of hydraulic jack devices 8 are stretched across the front and back surfaces (only the front surface is shown) of the boiler building 1, and the pair of reinforcing strands 7 are stretched across each other. .

  As shown in FIG. 6, the hydraulic jack device 8 includes a jack body 10, an accumulator 11, and a flow rate adjustment valve 12. The flow rate adjusting valve 12 is composed of a pilot check valve 14 provided with a throttle valve 13 and a check valve 15 connected in parallel.

  In the hydraulic jack device 8, for example, when a tensile force (T) acts on one reinforcing strand 7 (shown by a solid line) as a result of the seismic force (H) acting on the boiler building 1, the push side of the jack body 10 is pushed. The pressure in (E) rises and the pilot check valve 14 of the flow rate adjustment valve 12 opens. At this time, when the oil passes through the throttle valve 13, the tensile force (T) acting on the reinforcing strand 7 is absorbed. The oil flows into the pull side (R) of the jack body 10 and the accumulator 11.

  When the seismic force (H) acts in the opposite direction, a tensile force (T) acts on the other reinforcing strand 7 (indicated by a dotted line), and the reinforcing strand 7 is reinforced in the same manner as in the case of the one reinforcing strand 7. The tensile force (T) acting on the strand 7 is absorbed. At this time, since the tensile force (T) does not act on one reinforcing strand 7, oil is supplied from the accumulator 11 to the push side (E) of the jack body 10 on the one reinforcing strand 7 side. .

  Thus, as a result of the seismic force (H) being absorbed by the hydraulic jack device 8 having the damping damper function, the collapse of the boiler building 1 during dismantling can be reliably prevented.

  Next, a method for disassembling the boiler according to the present invention will be described.

  First, the reinforcing strand 7 is stretched over the front and back surfaces of the boiler building 1 via the hydraulic jack device 8, and the temporary beam 4 is stretched between the tops of the pair of main pillars 1 </ b> A and suspended from the temporary beam 4. A jack 5 is installed.

  When the reinforcing strand 7, the temporary beam 4 and the suspension jack 5 are installed in this way, both ends of the ceiling beam 2 are cut and the ceiling beam 2 is separated from the boiler building 1. Thereby, the ceiling beam 2 and the boiler 3 are suspended by the suspension strand 6 of the suspension jack 5 installed on the temporary beam 4.

  When the ceiling beam 2 is separated from the boiler building 1, as shown in FIG. 4, the suspension jack 5 is operated to suspend the boiler 3 together with the ceiling beam 2 until the lower surface of the boiler 3 lands on the ground. When the boiler 3 is suspended to the ground, the lower part of the boiler 3 is disassembled, and the dismantled material is removed outside the boiler building 1. Then, after the removal, the boiler 3 is again suspended to the ground, and the next lower part of the boiler 3 is disassembled and removed.

  If the above operations are repeated, all the boilers 3 can be disassembled.

  According to the present invention, the following effects are brought about.

  (A) As a result of being able to reinforce the boiler building 1 by crossing and stretching the reinforcing strand 7 across the boiler building 1 via the hydraulic jack device 8 having a damping damper function, it is effective when the boiler is disassembled. The reinforcement of the boiler building can be minimized.

  (B) By stretching the reinforcing strand 7 across the boiler building 1, it is not necessary to re-stretch the reinforcing strand 7 as the boiler 3 is disassembled.

  (C) A hydraulic jack device including a reinforcing strand 7, a jack body 10, an accumulator 11, a pilot check valve 14 provided with a throttle valve 13, and a flow rate adjusting valve 12 in which a check valve 15 is connected in parallel. Since the seismic energy is reliably absorbed by the hydraulic jack device 8 by being stretched over the boiler building 1 via 8, the earthquake resistance effect of the boiler building 1 is improved.

1: Boiler building 1A: Main pillar 2: Ceiling beam 3: Boiler 4: Temporary beam 5: Suspension jack 6: Suspension strand 7: Reinforcement strand 8: Hydraulic jack device 9: Reinforcement material 10: Jack body 11: Accumulator 12: Flow control valve 13: Throttle valve 14: Pilot check valve 15: Check valve 21: Boiler building 21A: Main pillar 22: Ceiling beam 23: Boiler 24: Temporary beam 25: Suspension jack 26: Suspension strand 27: Reinforcement strand 28: Seismic jack

Claims (2)

A temporary beam provided with a suspension jack is stretched between the tops of a pair of main pillars constituting a boiler building, reinforced by crossing reinforcing strands, and the lower part of the temporary beam is below the temporary beam. A ceiling beam spanned between the upper portions of a pair of main pillars and from which the boiler is suspended is separated from the pair of main pillars, and the ceiling beam and the boiler are integrally grounded by the suspension jack. After the boiler is disassembled, the ceiling beam and the boiler are once again suspended to the ground, and the operation of disassembling the next lower part of the boiler is repeated to remove the boiler. In the method of dismantling,
The lower end of the reinforcing strand is fixed to the ground or the column base of the lower corner portion of the permanent column through a hydraulic jack device having a damping damper function, and the upper end of the reinforcing strand is fixed to the upper portion of the permanent column. A method for disassembling a boiler, characterized by being fixed.   The hydraulic jack device includes a jack body, an accumulator, a flow rate adjusting valve in which a pilot check valve provided with a throttle valve and a check valve are connected in parallel, and when a tensile force acts on the reinforcing strand. When the pressure on the push side of the jack body rises, the pilot check valve opens, and at this time, when the oil passes through the throttle valve, the tensile force acting on the reinforcing strand is absorbed, and the oil is The boiler disassembly method according to claim 1, wherein the boiler flows into the pull side of the jack body and the accumulator.

Images