JP3646335B2 - Reinforcement structure for large structures - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a reinforcing structure for a large structure, and particularly to a reinforcing structure for a large structure that is deformed by a temperature change.
[0002]
[Prior art]
5 and 6 illustrate an exhaust gas boiler as an example of a conventional large structure, and a large exhaust gas duct 2 for guiding exhaust gas 1 from an exhaust gas turbine (not shown) driven by natural gas, heavy oil, or the like as a fuel is provided. 18 is provided with a heat exchanger 6 including a economizer 3, an evaporator 4, a superheater 5 and the like in the path of the exhaust gas duct 2 to generate steam, and the heat exchanger The steam generated in 6 is supplied as a heat source for air conditioning equipment or the like.
[0003]
On the upper and lower parts of the heat exchanger 6, there are provided partition walls 7 that partition the inside and outside of the exhaust gas duct 2 in which the economizer 3, the evaporator 4, the superheater 5 and the like are disposed. A header enclosure 9 (maintenance space) provided with various headers 8 for supplying and removing water and steam to and from the economizer 3, the evaporator 4, the superheater 5, and the like is formed outside the unit 7. Thus, an outer casing 10 is provided.
[0004]
In addition, a steam drum 11 is provided on the upper portion of the outer casing 10, and a header connected to the steam drum 11 through the partition wall 7 to the feed water heating pipe 3 a at the last stage of the economizer 3. 8 is connected via a heated water pipe 12. Further, the bottom of the steam drum 11 is connected to the upper end of a downcomer pipe 13 extending downward, and the lower end of the downcomer 13 is bent horizontally in the lower header enclosure 9 so that the horizontal part 13a is evaporated. The evaporator 4 is connected to the evaporation pipe 4 a via a header 8, and the header 8 provided at the upper end of the evaporation pipe 4 a is connected to the steam drum 11 via a steam return pipe 14. Further, the upper end portion of the steam drum 11 is connected to a header 8 attached to the superheater pipe 5 a of the superheater 5 through a steam supply pipe 15. In the figure, 16 is a water supply pipe connected to the economizer 3, 17 is a steam pipe connected to the superheater 5, and 19 is a heat insulating material.
[0005]
The water supplied from the water supply pipe 16 is heated by the economizer 3 to become heated water, is supplied to the steam drum 11 by the heated water pipe 12, and is separated into water and steam.
[0006]
The heated water separated in the lower part of the steam drum 11 descends through the downcomer 13 and rises from the lower horizontal part 13a and the header 8 in the evaporator 4a of the evaporator 4 and is heated to become steam. The steam return pipe 14 returns to the steam drum 11. The steam separated in the upper part of the steam drum 11 is supplied to the superheater pipe 5a of the superheater 5 through the steam supply pipe 15 and is superheated so that it becomes superheated steam and is supplied to the destination by the steam pipe 17. It has become.
[0007]
The exhaust gas duct 2 of the exhaust gas boiler has a relatively small strength against the force acting in the vertical and lateral directions, and the economizer 3, the evaporator 4 and the superheater 5 are also simply heat transfer tubes 3a and 4a having a small diameter. , 5a, and has a low strength. For this purpose, a reinforcing structure 20 as shown in FIGS. 5 and 6 is provided.
[0008]
As shown in FIG. 6, the reinforcing structure 20 is provided with lower fixing points 21 and 22 and upper fixing points 23 and 24 at four corners in the exhaust gas duct 2 having a rectangular shape, and left and right upper and lower fixing points 21. , 23 and the upper and lower fixing points 22, 24 are connected by left and right support columns 25, 26, and the upper fixing points 23, 24 are connected by a ceiling beam 27. Most of the weight of the economizer 3, the evaporator 4 and the superheater 5 is suspended and supported through the suspension material 28, and the weight of the economizer 3, the evaporator 4 and the superheater 5 is supported. A part is supported by a support receiving member 29 provided in the lower part.
[0009]
In the exhaust gas boiler described above, the temperature of the exhaust gas 1 greatly fluctuates due to fluctuations in the amount of steam required for the heat exchanger 6 from the air conditioning equipment or the like due to the start / stop of the gas turbine or seasonal changes in the outside air temperature. For this reason, the exhaust gas duct 2 and the heat transfer tubes 3a, 4a, 5a of the heat exchanger 6 expand and contract, and the exhaust gas duct 2 is deformed and tilted by expanding and contracting unevenly. Will occur.
[0010]
In order to cope with this problem, conventionally, the fixing points 21 and 24 at the diagonal positions and the fixing points 22 and 23 are connected by braces 30, 31 (stretch reinforcement), The exhaust gas duct 2 is prevented from being distorted or inclined.
[0011]
[Problems to be solved by the invention]
However, in the conventional large structure reinforcing structure, the exhaust duct 2 is formed by the braces 30 and 31 that are diagonally connected to each other between the fixing points 21 and 24 and between the fixing points 22 and 23. In order to prevent distortion and inclination, irregular deformation of the exhaust gas duct 2 causes the braces 30 and 31 to act on the braces 30 and 31 in a manner in which tensile and compressive forces oppose each other. , 31 has a problem that a large force acts on only one of them, causing the braces 30, 31 to bend or break without being able to withstand the tensile force.
[0012]
For this reason, it has been conventionally considered that the brace has a strong structure. However, such a method of increasing the strength has a problem in that the apparatus becomes large and heavy.
[0013]
The present invention has been made in view of such circumstances, and can prevent a large force from acting only on a part of the braces and reliably restrain deformation of a large structure with a lightweight structure. An object of the present invention is to provide a reinforcing structure for a large structure.
[0014]
[Means for Solving the Problems]
The present invention relates to a reinforcing structure for a large structure that restrains a change in shape of the large structure by braces, and includes a support bracket that is fixed with an oblong hole at one point where the large structure is to be restrained. A circular rotary piece that can be fitted to the oval hole of the support bracket and rotated and slid in the longitudinal direction of the oval hole, and the same from the center of the rotary piece on a straight line passing through the center of the rotary piece Two connecting holes formed at positions spaced apart from each other, and two fixed points having a required distance from the support bracket and fixed at required spacing positions sandwiching the axis of the oblong hole And one brace that connects one connecting hole of the rotating piece and one fixing point, and the other brace that connects the other connecting hole of the rotating piece and the other fixing point. .
[0015]
In addition, an oval groove is formed at an intermediate position in the thickness direction of the support bracket on the inner surface of the oval hole, and a circular convex portion that fits into the oval groove is formed on the outer peripheral surface of the rotary piece. A notch for fitting is formed at a position substantially parallel to a straight line connecting two connecting holes in the outer peripheral portion.
[0016]
[Action]
In the present invention, when a large structure is deformed to expand due to an increase in temperature and a large tensile force is about to act on one of the braces, the connecting hole that is eccentric with respect to the rotation center of the rotating piece, and the rotation The rotating piece is rotated in a direction in which the center and the brace on which a large tensile force is acting are about to be in a straight line. At this time, the rotating piece rotates until the tensile force of one brace and the other brace becomes balanced, and the rotating piece stops at the position where the tensile force of both braces is balanced.
[0017]
As described above, since the same tensile force always acts on the two braces, even if the brace is light and small, it can withstand the tensile force.
[0018]
Further, when the large structure is to be reduced, the rotating piece can move in the longitudinal direction of the oblong hole along the oblong groove, so that a large compressive force acts on the brace and the brace Problems such as bending can be prevented.
[0019]
In addition, an oval groove is formed at an intermediate position in the thickness direction of the support bracket on the inner surface of the oval hole, and a circular convex portion that fits into the oval groove is formed on the outer peripheral surface of the rotary piece. Since the fitting notch is formed at a position substantially parallel to the line connecting the two connecting holes in the portion, the rotary piece is securely attached to the support bracket by the fitting of the oval groove and the circular convex portion. The circular protrusion of the rotary piece can be easily attached to and detached from the oval groove of the oval hole by the fitting notch. Can do.
[0020]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0021]
FIG. 1 shows an embodiment of the present invention applied to the conventional large structure reinforcing structure 20 of FIG. 6, and FIGS. 2 to 4 show the present invention more specifically. In the figure, the same reference numerals as those in FIG. 6 denote the same items.
[0022]
As shown in FIG. 1, lower fixing points 21 (one fixing point A) and 22 (the other fixing point B) and upper fixing points 23 and 24 are provided at four corners in the exhaust gas duct 2 having a rectangular shape. The left and upper fixed points A and 23 and the right and upper fixed points B and 24 are connected by left and right support columns 25 and 26, respectively, and the upper fixed points 23 and 24 are connected by a ceiling beam 27. The support bracket 32 is attached to the middle portion of the ceiling beam 27 in the longitudinal direction. Further, in the illustrated case, a suspension beam 33 is provided between the upper fixing points 23 and 24 and the support bracket 32, and the suspension-saving beam 33 is connected to the suspension beam 33 via a suspension member 28. 3. Most of the weight of the evaporator 4 and the superheater 5 is suspended and supported.
[0023]
As shown in FIGS. 2 to 4, the support bracket 32 is formed with a vertically long oblong hole 34, and the inner surface of the oblong hole 34 has an intermediate position in the thickness direction of the support bracket 32. An oval groove 35 is formed along the oval hole 34. In the oval hole 34, a substantially circular rotary piece 37 having a circular convex portion 36 fitted to the oval groove 35 on the outer periphery. The rotary piece 37 is supported so as to rotate along the oval hole 34 and to slide in the longitudinal direction of the oval hole 34.
[0024]
In the rotary piece 37, two connecting holes 40, 41 are provided at positions spaced apart from the rotation center 38 of the rotary piece 37 by the same distance on a straight line 39 passing through the center (rotation center) 38 of the rotary piece 37. A fitting notch 42 is formed by cutting one portion of the outer peripheral portion of the rotary piece 37 at a position substantially parallel to the straight line 39 connecting the centers of the two connecting holes 40 and 41. ing.
[0025]
Further, as shown in FIGS. 1 and 2, one (left side) connecting hole 40 and one (left side) fixing point A of the rotary piece 37 are connected by one (left side) brace 43 via a pin 44. In addition, the other (right side) fixing point B of the rotary piece 37 and the other (right side) connection hole 41 are connected via the pin 46 by the other (right side) brace 45. In FIG. 2, 47 is a dust discharge notch for discharging dust accumulated in the oval groove 35 formed at the lower end of the oval hole 34 of the support bracket 32, 50 is an axial center line of the oval hole 34, FIG. 2 and 3, 48 is a retaining member for the pins 44, 46, and 49 is a slip accelerating member for ensuring slippage between the braces 43, 45 and the rotary piece 37 and the retaining member 48. .
[0026]
Next, the operation of the above embodiment will be described.
[0027]
When the exhaust gas duct 2 or the heat exchanger 6 which is a large structure is deformed to expand due to an increase in temperature and a large tensile force F ₁ is about to act on the right brace 45 shown in FIG. by 41 is eccentric with respect to the rotation center 38 of the rotary piece 37, a brace 45 which large tensile force F ₁ is exerted, the connecting hole 41 in which the brace 45 is connected, the rotary piece 37 The rotary piece 37 is rotated in a direction in which the rotation center 38 is in a straight line. At this time, the rotation of the rotary piece 37 increases the tensile force F ₂ on the left brace 43, so that the rotary piece 37 reaches a position where the tensile forces F ₁ and F _{2 of} both the braces 43 and 45 are balanced. Rotates and stops at a position where the tensile forces F ₁ and F _{2 of} both braces 43 and 45 are balanced.
[0028]
As described above, since the same tensile forces F ₁ and F ₂ always act on the _two braces 43 and 45, even if the braces 43 and 45 are light and small, the tensile force due to the deformation of the large structure. Will be able to withstand.
[0029]
Further, when the exhaust gas duct 2 or the heat exchanger 6 which is the large structure is to be reduced due to a decrease in temperature, the rotary piece 37 moves along the oval groove 35 in the longitudinal direction of the oval hole 34. Therefore, it is possible to prevent a problem that the braces 43 and 45 are bent due to a large compressive force acting on the braces 43 and 45.
[0030]
Further, as shown in FIG. 3, an oval groove 35 is formed at the intermediate position in the thickness direction of the support bracket 32 on the inner surface of the oval hole 34, and the oval groove 35 is formed on the outer peripheral surface of the rotary piece 37. Since the circular convex portion 36 to be fitted is formed, and the fitting cutout portion 42 is formed at a position substantially parallel to the straight line 39 connecting the two connecting holes 40 and 41 in the outer peripheral portion of the rotary piece 37. The rotation piece 37 is reliably supported by the support bracket 32 by the fitting of the oval groove 35 and the circular convex portion 36 and does not fall off, and the rotation of the rotation piece 37 and the sliding along the oval hole are ensured. The rotating piece 37 is rotated by 90 ° from the state shown in FIG. 2 by the fitting notch 42 so that the fitting notch 42 is parallel to the longitudinal direction of the oblong hole 34. 37 is the length of the oval hole 34 It can be easily attached to and detached from the groove 35.
[0031]
It should be noted that the present invention is not limited only to the above-described embodiments, and can be applied to the reinforcement structure of various large-sized structures other than the exhaust gas boiler, and various modifications can be made without departing from the scope of the present invention. Of course, it can be added.
[0032]
【The invention's effect】
According to the reinforcing structure for a large-scale structure of the present invention, in claim 1, when different tensile forces are applied to one and the other brace, the rotating force rotates and the tensile force acting on both braces is balanced. Therefore, even if the brace is light and small, it can withstand the tensile force caused by the deformation of the large structure.
[0033]
Further, when the large structure is to be reduced due to a decrease in temperature, the rotary piece can move in the longitudinal direction of the oblong hole along the oblong groove, so that a large compressive force acts on the brace. This can prevent problems such as bending the brace.
[0034]
According to a second aspect of the present invention, an oval groove is formed at an intermediate position in the thickness direction of the support bracket on the inner surface of the oval hole, and a circular convex portion that fits into the oval groove is formed on the outer peripheral surface of the rotary piece, and further rotated. Since the notch for fitting is formed at a position substantially parallel to the straight line connecting the two connecting holes in the outer peripheral part of the piece, the rotary piece falls off the support bracket by fitting the elliptical groove and the circular convex part. The circular notch of the rotary piece is formed into an oblong hole by making the rotary piece into a position parallel to the longitudinal direction of the oval hole by the fitting notch. Can be easily attached to and detached from the oval groove.
[Brief description of the drawings]
FIG. 1 is a cut front view showing an embodiment of the present invention.
FIG. 2 is a detailed view showing a configuration around a support bracket in FIG. 1;
FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2;
4 is a detailed view showing the operating state of FIG. 2;
FIG. 5 is a cut side view showing an example of an exhaust gas boiler as a large structure.
6 is a cut front view seen from the VI-VI direction of FIG.
[Explanation of symbols]
32 Support bracket 34 Oval hole 35 Oval groove 36 Circular convex part 37 Rotation piece 38 Center (rotation center)
39 Straight line 40 Connection hole 41 Connection hole 42 Notch 43 for fitting 43 Brace 45 Brace 50 Axis center line A One fixed point B The other fixed point

Claims (2)

A support structure for a large structure that restrains a change in shape of the large structure by braces, the support bracket having an oblong hole fixed at one point where the large structure is to be restrained, and the support bracket A circular rotating piece that can be fitted into the oblong hole and rotated and slidable in the longitudinal direction of the oblong hole, and on a straight line passing through the center of the rotating piece, the same distance from the center of the rotating piece Two connecting holes formed at different positions, two fixed points having a required distance from the support bracket and fixed at required intervals sandwiching the axis of the oblong hole, and the rotation A large structure comprising: one brace connecting one connecting hole of a piece and one fixing point; and the other brace connecting the other connecting hole of the rotating piece and the other fixing point. Reinforced structure. An oval groove is formed at an intermediate position in the thickness direction of the support bracket on the inner surface of the oval hole, and a circular convex portion that fits into the oval groove is formed on the outer peripheral surface of the rotary piece. The reinforcing structure for a large structure according to claim 1, wherein a notch for fitting is formed at a position substantially parallel to a straight line connecting the two connecting holes.

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