JP2001304505A - Structure for stopping vibration of boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniform horizontal force in vibration loaded on a backstay. SOLUTION: In addition to a bumper post 24 and a vibration stop hook 14 for connecting a boiler body 1 to boiler steel frames 20, 20a, a balance beam 25, which is linked to backstays 6 forming a plurality of steps, is disposed between the hook 14 and the backstays 6. Thus the horizontal force in vibration is dispersed to the plurality of steps of the backstays 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steady rest structure for suppressing a pendulum motion generated in a boiler main body due to an earthquake or the like by using a balance beam.

[0002]

2. Description of the Related Art A method of installing a boiler body and a conventional boiler anti-sway structure will be described with reference to FIGS.

[0003] Thermal expansion occurs in the vertical and horizontal directions on the furnace wall of the boiler body due to a temperature rise during operation of the boiler body. Therefore, it is necessary to install the boiler main body so as not to restrain the thermal expansion of the furnace wall, and the furnace wall tends to deform (bulge or dent) due to a change in internal pressure.

[0004] Therefore, as shown in FIG.
The boiler body 1 is suspended from the upper cross beam member 21 by an appropriate number of bar-shaped suspending members 22 to provide a support structure that does not restrict the thermal expansion of the furnace wall 2. The boiler body 1 shown in FIG.
The lower part of the left part 3 is a combustion chamber 5.

[0005] The boiler steel frame 20 is a structure (for example, a steel frame, a column, a wall, or the like) built on a foundation 23, and the boiler steel frame 20 is installed so as to surround the boiler main body 1, and the upper portion thereof Are connected by a truss, and the cross beam member 21 is fixed.

On the other hand, in order to suppress the deformation of the furnace wall 2 due to the internal pressure, a plurality of horizontal reinforcing members 6 called backstays are arranged on the furnace wall 2 in upper and lower stages. Backstay 6
Is, for example, an H-shaped steel.

However, in order to prevent the thermal expansion of the furnace wall 2 from being restricted, as shown in FIG. 6, each of the backstays 6 has only one portion 8 indicated by a black circle corresponding to the starting point 7 of the furnace wall 2. It is fixed to the furnace wall 2 and is slidably connected only in the horizontal direction as indicated by an arrow at other places 9 indicated by white circles. FIG.
Here, the cross section of the boiler body 1 is rectangular.

FIG. 7 shows an example of a fixing structure between the furnace wall 2 and the backstay 6. A mounting seat 10 is fixed to the surface of the furnace wall 2, and the mounting seat 10 is fixed to the backstay 6 with bolts 11. .

FIG. 8 shows a slide connection structure between the furnace wall 2 and the back stay 6, in which a mounting seat 10 is fixed to the surface of the furnace wall 2. In this case, the mounting seat 10 is attached to the back stay 6 up and down. The mounting seat 10 is connected to the backstay 6 by a bolt 11 through a horizontally elongated hole 13 opened in the backstay 6.

Since the boiler body 1 is suspended and supported as described above, a pendulum motion occurs in the boiler body 1 during an earthquake or the like.

In order to prevent the run-out, the boiler main body 1 is connected to the boiler steel frame 2 with a structure that does not restrain the thermal expansion of the furnace wall 2.
Must be tied to 0.

Conventionally, as shown in FIGS. 5 and 9, a bumper post 24 is fixed to a boiler steel frame 20 in a vertical direction.
On the boiler body 1 side, all the back stays 6 have the steady rest hooks 1 that sandwich each bumper post 24 from both sides.
4 is fixed.

Further, in the example shown in FIG. 5, since the boiler main body 1 is divided into two right and left parts 3, 4, a boiler steel frame 20a is also built between these parts, and a bumper post 24 is fixed to the boiler steel frame 20a. The steady rest hooks 14 are fixed to all the back stays 6 provided in the left and right portions 3 and 4.

[0014] The steady rest hook 14 is a bumper post 24.
In contrast, it has a structure that can slide vertically.
Further, one or more bumper posts 24 are fixed to each of the boiler steel frames 20, 20a at positions corresponding to the four sides of the boiler main body 1.

With the above structure, even when the boiler body 1 attempts to perform a pendulum motion, the horizontal swing is prevented by the engagement between the bumper post 24 on the boiler steel frame side and the steady rest hook 14 on the back stay side.

Even if thermal expansion occurs in the furnace wall 2 of the boiler body 1, the thermal expansion in the vertical direction is reduced by each of the steady rest hooks 14.
Slides with respect to the bumper post 24 and is not restrained. In addition, the thermal expansion in the horizontal direction is not restrained because the furnace wall 2 slides with respect to each backsstay 6 except for one fixing point 8.

[0017]

Since each backstay 6 is fixed at one location corresponding to the starting point 7 of the furnace wall 2, the backstay 6 cannot be subjected to an excessive horizontal force. For this reason, the following problems have occurred. (1) As the boiler becomes larger, the horizontal force acting on each steady rest hook 14 at the time of an earthquake or the like increases. Therefore, the number of backstays 6 is increased, and the horizontal force is applied to as many backstays as possible. Need to be dispersed. (2) When the number of stages of the backstay 6 increases, the mounting seat 1 serving as an adhesive for transmitting a horizontal force between the backstay 6 and the furnace wall 2 is mounted.
0. The number of installations of the steady rest hooks 14 and the like, which are the attachments for transmitting the horizontal force between the back stay 6 and the bumper post 24, increases, and the cost increases. (3) Since the horizontal force applied to the backstay 6 at each stage varies, the horizontal force that can be supported by one bumper post 24 is the proof stress of the steady rest hook 14, in other words, the backstay 6 that is the source of this. It reaches a plateau in proof stress. (4) In calculating the frame of the boiler steel frame, the spring constant of the steady rest is a large factor. However, when the steady rest hooks 14 and the back stays 6 are large and the horizontal force acting on these is large and varies, the steady rest is reduced. Since the degree of freedom in design is reduced, it is very difficult to reproduce the spring constant of the steady rest used in the frame calculation in the practical design of the boiler steel frames 20, 20a.

Accordingly, an object of the present invention is to distribute the horizontal force acting on one steady rest hook during vibration to a plurality of backstays so that the horizontal force borne by the backstays can be made uniform. An object of the present invention is to provide a boiler steady rest structure.

[0019]

According to a first aspect of the present invention, there is provided a boiler steady rest structure, wherein a balance beam is vertically fixedly coupled to one backstay of a boiler main body, and The beam is attached to the other backstay so as to be slidable in a vertical direction, and a steady rest hook is attached to the balance beam, whereby the horizontal force at the time of vibration applied to the balance beam is balanced. It is dispersed evenly among a plurality of backstays connected to the beam, and the horizontal force acting on these backstays becomes uniform.

According to a second aspect of the present invention, in the first aspect of the present invention, the number of the steady rest hooks is smaller than the number of the back stays to which the balance beam is coupled.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a boiler steadying structure according to the present invention will be described below with reference to the drawings. FIG. 1 shows a boiler provided with a boiler steadying structure according to an embodiment of the present invention, and FIG. 2 shows a relationship between a backstay, a balance beam, and a steadying hook of the steadying structure according to the embodiment of the present invention. FIG. 3 shows an example of a fixed structure between the backstay and the balance beam, and FIG. 4 shows an example of a slide connection structure between the backstay and the balance beam. Components having the same functions as those in FIGS. 5 to 9 used in the description of the related art are denoted by the same reference numerals, and the description will not be repeated.

In FIG. 1, the boiler body 1 is suspended from a cross beam member 21 above a boiler steel frame 20 by a suspending tool 22. On the furnace wall 2, a plurality of backstays (horizontal reinforcing members) 6 are arranged vertically. Each backstay 6 is fixed to the furnace wall 2 only at one extension starting point,
At other points, they are slidably connected only in the horizontal direction.

Further, in order to prevent the boiler main body 1 from oscillating, in addition to the bumper post (buffer vertical beam member) 24 and the anti-sway hook 14 for connecting the boiler main body 1 to the boiler steel frames 20 and 20a, the anti-sway hook 14 A balance beam (vertical beam member for horizontal force distribution) 25 is provided between the backstay 6 and the backstay 6.

Each balance beam 25 is vertically fixedly connected to one backstay 6, and is connected to one or more other backstays 6 so as to be slidable only in the vertical direction.

The bumper post 24 is connected to the 4 of the boiler body 1.
At a position corresponding to the side, one or a plurality of boilers are fixed to each of the boiler steel frames 20, 20a.

Referring to FIG. 1, a description will be given of a bumper post 24 fixed to the left boiler steel frame 20. Two upper and lower anti-sway hooks 14 are connected to the bumper post 24, and each of the anti-sway hooks 14 is a two-stage upper and lower balance. Each is fixed to the beam 25. The upper stage balance beam 25 is fixed to the uppermost backstay 6 at the upper end thereof, but is not connected to the second stage backstay 6 at all, and is perpendicular to the third stage backstay 6 at the lower end. It is mounted so that it can slide in any direction. Lower stage balance beam 25
Is fixed to the fourth stage backstay 6 at its upper end,
The lower end is attached to the fifth-stage backstay 6 so as to be slidable in the vertical direction.

The bumper post 24 fixed to the left side of the central boiler steel frame 20a will be described. The bumper post 24 is connected to two upper and lower steady rest hooks 14, and each of the steady rest hooks 14 is an upper and lower two-stage balanced beam 25. Respectively. The upper-stage balance beam 25 is fixed to the second-stage backstay 6 at the upper end, and is vertically slidably attached to the third-stage backstay 6 at the lower end. Similarly, the lower stage balance beam 25 is fixed to the fourth stage backstay 6,
The lower end is attached to the fifth-stage backstay 6 so as to be slidable in the vertical direction.

The bumper post 24 fixed to the right side of the central boiler steel frame 20a will be described. One anti-sway hook 14 is connected to the bumper post 24, and the anti-sway hook 14 is fixed to a one-stage balance beam 25. Have been. The balance beam 25 is fixed at its upper end to the second-stage backstay 6 and is vertically slidably attached to the third-stage backstay 6 at its lower end.

The bumper post 24 fixed to the right boiler steel frame 20 will be described.
One steady rest hook 14 is connected to 4, and this steady rest hook 14 is fixed to a one-stage balance beam 25. The balance beam 25 is fixed to the uppermost backstay 6 at its upper end, but is not coupled to the second backstay 6 but slides vertically to the third backstay 6 at the lower end. Mounted as possible.

In this embodiment, as shown in FIG. 2, two balance beams 25 are mounted in parallel. FIG.
Reference numeral 14a denotes a hook piece, which constitutes the steady rest hook 14 by fixing the two hook pieces 14a one by one to the two balance beams 25 one by one.
A point 26 indicated by a black circle is a fixed point, and a point 27 indicated by a white circle is a slide connection point that can slide in the vertical direction.

FIG. 3 shows an example of a fixing structure of the balance beam 25 and the backstay 6. In this embodiment, a mounting seat 15 is fixed to the backstay 6, and the balance beam 25 is vertically attached to the mounting seat 15 by welding 16. It is fixed to.

FIG. 4 shows an example of a slide connection structure between the balance beam 25 and the back stay 6. In this embodiment, the mounting seat 15 is fixed to the back stay 6. The slide member 17 that slides in the vertical direction while holding the right and left is fixed.

With the above structure, even if the boiler main body 1 attempts to perform a pendulum motion, the horizontal deflection is prevented by the engagement between the bumper post 24 on the boiler steel frame side and the steady rest hook 14 on the balance beam side.

At this time, since the steady rest hooks 14 are attached to the balance beams 25, the horizontal force applied to each balance beam 25 when vibrating is distributed evenly to the plurality of backstays 6 coupled to the same balance beam 25. Because
The horizontal force acting on these back stays 6 becomes uniform.

The number of the steady rest hooks 14 may be plural per balance beam 25.
Is distributed to the plurality of backstays 6 on average, so that the horizontal force per backstay can be increased to near an allowable value. As a result, the number of the steady rest hooks 14 can be made smaller than the number of the back stays 6 to which the balance beam 25 is coupled, and accordingly, the number of parts is reduced and the manufacturing cost is reduced.

Although each balance beam 25 is fixed to only one backstay 6, it may be slidably connected to a plurality of other backstays 6, or may be slidably connected to the backstay 6 fixed to the balance beam 25. One or more backstays 6 that do not couple to the balance beam 25 at all may be provided between the backstays 6.
In the former case, that is, when there are a plurality of other backstays slidably coupled to the balance beam 25, the horizontal force applied to one balance beam 25 at the time of vibration is dispersed evenly to more backstays 6. . In the latter case, that is, when there is at least one backstay not coupled to the balance beam 25 between the backstay fixed to the balance beam 25 and another backstay slidably coupled to the balance beam 25, the balance beam 2
The members (the mounting seat 15 and the slide member 17) required for the slide connection between the backstay 5 and the backstay 6 are reduced, and the manufacturing cost is reduced.

Further, each balance beam 25 may be fixed to only one backstay 6 at its lower end and slidably coupled to another backstay 6 at its upper end. Or,
The middle portion may be fixed to only one backstay 6, and the upper and lower ends may be slidably connected to another backstay 6.

[0038]

As described in detail above, claim 1 is as follows.
According to the boiler steady structure of the invention according to the invention, the balance beam is vertically fixed to one back stay of the boiler main body and combined, and the balance beam is slidably attached to another back stay in the vertical direction and combined, and the steady beam is combined. Since the hook is attached to the balance beam, the horizontal force at the time of vibration applied to the balance beam is evenly distributed to a plurality of backstays coupled to the same balance beam, and the horizontal force acting on these backstays The force becomes uniform.

As a result, the number of stages for connection with the backstay can be reduced as compared with the conventional case, and the number of mounting seats (adhesive metal for horizontal force transmission) between the backstay and the furnace wall can be reduced. become. That is, the manufacturing cost can be reduced.

Further, since the horizontal force acting on each backstay is made uniform and small, the degree of freedom in the design of the steady rest is increased, and the reproduction of the spring constant is facilitated. As a result, the design cost can be reduced, the design process can be shortened, and the manufacturing process can have a margin.

The boiler steady structure according to the second aspect of the invention is characterized in that the number of steady rest hooks is smaller than the number of backstays to which the balance beam is coupled, so that the manufacturing cost is reduced accordingly.

Further, the installation position of the steady rest hook can be arbitrarily determined, and the degree of freedom of the steady rest design can be increased.

[Brief description of the drawings]

FIG. 1 is a diagram showing a boiler provided with a boiler steadying structure according to an embodiment of the present invention.

FIG. 2 is a view showing a relationship between a backstay, a balance beam, and a steady rest hook of the steady rest structure according to the embodiment of the present invention.

FIG. 3 is a diagram showing an example of a fixing structure between a backstay and a balance beam.

FIG. 4 is a diagram showing an example of a slide connection structure between a backstay and a balance beam.

FIG. 5 is a view showing a boiler provided with a conventional boiler steadying structure.

FIG. 6 is a view showing a connection relationship between a furnace wall of a boiler main body and a backstay.

FIG. 7 is a diagram showing an example of a fixing structure of a furnace wall and a backstay.

FIG. 8 is a diagram showing an example of a slide connection structure between a furnace wall and a backstay.

FIG. 9 is a view showing a conventional steady rest structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Boiler main body 2 Furnace wall 3 and 4 The part divided into right and left of a boiler main body 5 Combustion chamber 6 Back stay 7 Extension starting point 8 Back stay fixing place 9 Back stay horizontal sliding connection place 10 Back stay mounting seat 11 Bolt 12 Backstay horizontal slide member 13 Horizontal elongated hole 14 Steady stop hook 14a Hook piece 15 Balance beam mounting seat 16 Welding 17 Balance beam vertical slide member 20, 20a Boiler steel frame 21 Cross beam member 22 Rod hanger 23 Foundation 24 Bumper post 25 Balance beam 26 Balance beam fixing point 27 Balance beam vertical sliding connection point

Claims (2)

[Claims] 1. The swinging of a suspended and supported boiler body,
In a boiler steady structure, which is prevented by a bumper post and a steady rest hook that connects a boiler steel frame and the boiler main body, a balance beam is vertically fixedly coupled to one backstay of the boiler main body, and the balance beam is connected to another back stay. A boiler steadying structure, wherein the steadying hook is attached to the balance beam so as to be slidably attached to a backstay in a vertical direction and is coupled to the backstay. 2. The boiler steadying structure according to claim 1, wherein the number of said steadying hooks is smaller than the number of backstays to which said balance beam is coupled.