JP2007063941A - Aseismic support structure of boiler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aseismic support structure of a boiler capable of providing the superior earthquake response reducing effect by arranging a proper aseismic member in a place having to take into consideration a dead load. <P>SOLUTION: This aseismic support structure 10 of the boiler has a support steel frame 11 having a column 11a, a horizontal brace and a vertical brace and supporting a boiler body B, and a suspending member suspended by the support steel frame 11 and suspending and supporting the boiler body B so as to allow the expansion-contraction by heat; and is provided with an aseismic brace 12 having the aseismic function instead of the vertical brace; and is characterized in that these aseismic braces 12 are constituted so as to have a larger yielding point increasing toward a lower story. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vibration control support structure for a boiler supported by a supporting steel frame, such as a coal-fired boiler for power generation and a heavy oil fired boiler.

As the damping control structure of the boiler, there is a seismic tie that is provided between the boiler body and the supporting steel frame to limit the relative displacement of both when the earthquake occurs, and between the furnace part and the cage part of the boiler body. What is provided with the connecting device to connect is known (for example, refer to patent documents 1).
Moreover, what was equipped with the vibration damping device between the boiler main body and the support steel frame is also known (for example, refer patent document 2).
JP-A-5-322103 JP-A-8-285208

Conventionally, as disclosed in these patent documents, some damping member (or damping device) is arranged between the boiler body and the supporting steel frame (that is, a place where the dead load need not be considered). And we are trying to get an earthquake response reduction effect. This is a method that was unavoidably taken because the supporting steel frame has a truss structure, and when trying to place a damping member in a place where dead loads must be considered, the strength calculation becomes complicated and the design becomes difficult It is.
However, as a result of repeated tests, the inventors of the present invention have excellent earthquake response reduction by arranging an appropriate damping member at a place where dead load must be considered after considering dead load. The knowledge that an effect can be acquired was acquired.

  The present invention has been made in view of the above circumstances, and by arranging an appropriate vibration control member at a place where a dead load must be taken into account, a boiler control capable of obtaining an excellent earthquake response reduction effect is provided. The purpose is to provide a seismic support structure.

The present invention employs the following means in order to solve the above problems.
A boiler vibration control support structure according to the present invention includes a column, a horizontal brace, and a vertical brace, and is supported on a support steel frame that supports the boiler body, and is suspended from the support steel frame so as to allow expansion and contraction of the boiler body due to heat. A vibration control support structure for a boiler having a suspension member that supports and suspends the vibration brace, and a vibration control brace having a vibration control function is provided instead of the vertical brace. It is configured to have a yield point that increases as it goes to the floor.
According to such a vibration control support structure for a boiler, even if an earthquake horizontal force is applied to the support steel due to an earthquake or the like, and the support steel is deformed in the horizontal direction, the vibration energy is absorbed by the vibration control brace to add attenuation. Therefore, it is possible to reduce the layer shear force of the support frame due to earthquakes, etc., to reduce the seismic load acting on the support steel frame, and to reduce the deformation amount of the support steel frame. The earthquake resistance of the steel frame can be improved.
In addition, since the seismic load acting on the supporting steel frame is reduced, the constituent members of the supporting steel frame can be made thinner and lighter, and a low-cost boiler support structure can be obtained.
Further, as the vibration control brace, for example, the diagonal material disclosed in Japanese Patent Application Laid-Open No. 2000-81085 filed earlier by the present applicant or the history damper disclosed in Japanese Patent Application No. 2004-369773 is used. Has a plasticized region in which the cross-sectional area of the specific part (damper part) is reduced (reduced), so that the axial rigidity of the vibration control brace itself can be increased, Even if an earthquake horizontal force is applied to the support steel and the support steel is slightly deformed in the horizontal direction, the energy can be reliably absorbed by the vibration control brace.

The boiler equipment according to the present invention includes the above-described boiler vibration control support structure and a boiler body.
According to such boiler equipment, since the boiler body is supported by the support steel frame having excellent earthquake resistance, it is possible to improve the earthquake resistance of the entire boiler equipment.

The present invention includes a pillar, a horizontal brace, and a vertical brace, and includes a support steel frame that supports a boiler body, and is suspended from the support steel frame, and the boiler body is expanded by heat. It is a seismic retrofitting method for a seismic support structure of a boiler having a suspension member that supports the suspension so as to allow contraction, and a vertical brace of an existing supporting steel frame is removed, and instead of the removed vertical brace, It features a seismic brace that has a yield point that increases as it goes to the lower floors.

According to the seismic retrofit method for such a boiler seismic support structure, the seismic brace can be attached to the existing support steel relatively easily. It can be carried out easily and the construction cost for the construction can be reduced.
In addition, since the seismic brace is used in place of the vertical brace that constitutes the existing support steel frame, the change in appearance before and after the seismic retrofitting work can be minimized. It is possible to prevent an increase in weight and an increase in size of the entire supporting steel frame.
In addition, even if an earthquake horizontal force is applied to the supporting steel due to an earthquake or the like and the supporting steel is deformed in the horizontal direction, the vibration energy can be absorbed and absorbed by the seismic bracing. In addition to reducing the layer shear force, the seismic load acting on the supporting steel can be reduced, the deformation amount of the supporting steel can be reduced, and the earthquake resistance of the supporting steel can be improved.
Furthermore, since the seismic load acting on the supporting steel frame is reduced, it becomes possible to reduce the thickness and weight of the constituent members of the supporting steel frame, and to obtain a low-cost boiler support structure.
Furthermore, as the vibration control brace, for example, the diagonal material disclosed in Japanese Patent Application Laid-Open No. 2000-81085 previously filed by the present applicant or the history damper disclosed in Japanese Patent Application No. 2004-369773 is used. Has a plasticized region in which the cross-sectional area of the specific part (damper part) is reduced (decreased), so that the axial rigidity of the damping brace itself can be increased, and an earthquake, etc. As a result, even if the seismic horizontal force is applied to the support steel and the support steel is slightly deformed in the horizontal direction, the energy can be reliably absorbed by the vibration control brace.

  According to the vibration control support structure of the boiler according to the present invention, an excellent effect of reducing the earthquake response can be obtained by arranging an appropriate vibration control member at a place where a dead load must be considered.

Hereinafter, a first embodiment of a vibration control support structure for a boiler according to the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a boiler vibration control support structure according to the present embodiment. This boiler vibration control support structure 10 includes a support steel frame 11 and a vibration control brace (vibration control member) 12 as main elements.
In addition, the code | symbol B in FIG. 1 has shown the boiler main body, and this boiler main body B is supported via several suspension members (not shown) in order not to restrain the thermal expansion during a driving | operation. It is suspended from the top of the steel frame 11.

The support steel frame 11 includes a column 11a extending in the vertical direction, a beam 11b extending in the horizontal direction, and a horizontal brace (not shown) that joins nodes of the columns 11a and 11b.
The damping brace 12 has a plastic deformation performance equivalent to a tensile force with respect to a compressive force, and also serves as a vertical brace that joins the joint portions of the column 11a and the beam 11b. As such a vibration control brace 12, for example, an oblique material disclosed in Japanese Patent Application Laid-Open No. 2000-81085 previously filed by the present applicant, or a history damper disclosed in Japanese Patent Application No. 2004-369773, etc. Can be used.
Further, the damping brace 12 has a higher yield point as it goes to the lower floor (that is, the lower one in FIG. 1, in other words, the one that is placed at a position where a large dead load is applied). It is comprised so that it may have. Each damping brace 12 is coupled to a gusset plate (not shown) fixed to the column 11a and the beam 11b via a fastening member such as a high-strength bolt.

The seismic brace 12 can be implemented as “seismic retrofitting work” on an existing support steel frame.
As a construction method, first, a vertical brace of an existing supporting steel frame is removed, and a vibration control brace 12 is attached instead of the removed vertical brace. At this time, care must be taken so that the one having a higher yield point is arranged in the lower floor.

According to the vibration control support structure 10 of the boiler according to the present embodiment, even if an earthquake horizontal force is applied to the support steel 11 due to an earthquake or the like and the support steel 11 is deformed in the horizontal direction, the vibration energy is absorbed by the vibration control brace 12. Therefore, the layer shear force of the support steel 11 caused by an earthquake or the like can be reduced (see “the present invention” indicated by a solid line in FIG. 2), and the seismic load acting on the support steel 11 can be reduced. While being able to reduce, the deformation amount of the support steel frame 11 can be reduced and the earthquake resistance of the support steel frame 11 can be improved.
Note that the “conventional example” indicated by a broken line in FIG. 2 is an analysis result obtained by using a boiler vibration control support structure of the type disclosed in Japanese Patent Laid-Open No. 5-322103 described in the background section. is there.
Further, since the seismic load acting on the support steel frame 11 is reduced, the constituent members of the support steel frame 11 can be reduced in thickness and weight, and a low-cost boiler support structure can be obtained.
Further, as the damping brace 12, for example, the diagonal material disclosed in Japanese Patent Application Laid-Open No. 2000-81085 previously filed by the present applicant or the history damper disclosed in Japanese Patent Application No. 2004-369773 is used. Has a plasticized region in which the cross-sectional area of the specific portion (damper portion) is reduced (reduced), so that the axial rigidity of the damping brace 12 itself can be increased, Even if an earthquake horizontal force is applied to the support steel frame 11 due to the above, and the support steel frame 11 is slightly deformed in the horizontal direction, the energy can be reliably absorbed by the vibration control brace 12.

Furthermore, since the seismic brace 12 can be attached to the existing supporting steel frame relatively easily, the seismic retrofitting work of the existing supporting steel frame can be easily performed, and the construction related to the construction work Costs can be reduced.
Furthermore, since the seismic brace 12 is used in place of the vertical brace that constitutes the existing supporting steel frame, the change in appearance before and after the seismic retrofitting work can be minimized, and the seismic retrofitting It is possible to prevent an increase in weight and size of the entire supporting steel frame due to construction.

A second embodiment of the vibration control support structure for a boiler according to the present invention will be described with reference to FIG.
FIG. 3 is a schematic configuration diagram of a boiler vibration control support structure according to the present embodiment. The boiler's seismic control support structure 20 is composed mainly of a support steel frame 21, a first seismic control brace (damping member) 22, and a second seismic control brace (damping member) 23. It is.
In addition, the code | symbol B in FIG. 3 has shown the boiler main body, and this boiler main body B is supported via the several suspension member (not shown) in order not to restrain the thermal expansion during driving | operation. It is suspended from the top of the steel frame 21.

The supporting steel frame 21 includes a column 21a extending in the vertical direction, a large beam 21b and a small beam 21c extending in the horizontal direction, and a horizontal brace (not shown) that connects the nodes of the columns 21a and the large beam 21b (or the small beam 21c). ).
The first seismic control brace 22 also serves as a vertical brace that joins the nodes of the pillars 21a and the large beams 21b in the lower and middle floors, and the second seismic control brace 23 is in the upper floors. It also serves as a vertical brace that joins the nodes of the columns 21a and the beams 21b.
These vibration control braces 22 and 23 have plastic deformation performance equivalent to the tensile force with respect to the compressive force, similarly to the vibration control brace 12 described above. As such damping braces 22 and 23, for example, a diagonal material disclosed in Japanese Patent Application Laid-Open No. 2000-81085 previously filed by the present applicant, or a history damper disclosed in Japanese Patent Application No. 2004-369993. Etc. can be used.
Moreover, these seismic control braces 22 and 23 are so large that it goes to a lower floor (that is, the one arrange | positioned in the lower side in FIG. 3, in other words, the one arrange | positioned in the position where a big dead load is added). It is configured to have a yield point. That is, these seismic control braces 22 and 23 are the first seismic control brace 22 installed in the lowest layer (1st layer and 2nd layer) and the first seismic control brace installed in the middle layer (3rd layer and 4th layer). The brace 22, the second seismic brace 23 installed in the upper layer (5th layer), and the second seismic brace 23 installed in the uppermost layer (sixth layer) are configured so that their yield points become smaller. ing.
Each of the vibration control braces 22 and 23 is coupled to a gusset plate (not shown) fixed to the column 21a, the large beam 21b, or the small beam 21c via a fastening member such as a high-strength bolt.

These seismic control braces 22 and 23 can be carried out as “seismic control work” on the existing supporting steel frame.
As a construction method, first, the vertical brace of the existing support steel frame is removed, and the first seismic brace 22 or the second seismic brace 23 is attached instead of the removed vertical brace. At this time, care must be taken so that the one having a higher yield point is arranged in the lower floor. Immediately after removing the vertical brace, if an auxiliary member that shares the dead load is installed, the construction safety is further secured.

According to the vibration control support structure 20 of the boiler according to the present embodiment, the first vibration control brace 22 is arranged so as to connect the nodes of the columns 21a and the large beams 21b (that is, one for two layers). Since the number of parts can be reduced, the construction cost and the construction cost can be reduced.
Other functions and effects are the same as those of the above-described first embodiment, and thus description thereof is omitted here.

Now, as shown in FIG. 4, the lower ends of the pillars 11 a and 21 a described above are fixed to the ground G by the one-pillar-one-pile foundation (foundation where a single pillar supports one pillar) structure 30. It is preferable that
FIG. 4 is a side sectional view of the one-column / one-pile foundation structure 30. This one-column / one-pile foundation structure 30 includes a pile 31 embedded (or placed) in the ground G and a joining unit (joining member) 32 arranged vertically above the pile 31 as main elements. It has been done.

The pile 31 is, for example, a steel pile (hereinafter referred to as a “steel pipe pile”) having a wing (not shown) at the tip (the lower end in FIG. 4), and the tip is a support layer ( It is rotationally press-fitted into the ground G by a press-fitting machine or the like until it reaches (not shown).
The joining unit 32 is a hollow cylindrical member (for example, a steel member) having substantially the same outer diameter as that of the steel pipe pile 31, and the upper end thereof is an open end to make it easy to receive the bottom plate 33 of the columns 11a and 21a. The bottom plate 32a is provided at the lower end.
The steel pipe pile 31 and the joining unit 32 are joined by welding (or via an attachment plate and a bolt / nut).

  In the internal space of the joining unit 32, the tip end portions (lower end portions in FIG. 4) of the pillars 11a and 21a, which are positioned using a positioning device and have a cross-sectional shape, for example, are stored. The joining unit 32 and the columns 11a and 21a are joined by concrete 34 filled in the joining unit 32.

Below, the construction method of the 1 pillar 1 pile foundation structure which concerns on this embodiment is demonstrated.
First, after the steel pipe pile 31 is erected on the ground G at a predetermined position where the steel pipe pile 31 is to be embedded, the ground pipe G is placed in the ground G using a press-fitting machine (not shown) until the tip of the steel pipe pile 31 reaches the support layer. Rotate and press fit.
After the joining unit 32 is mounted on the pile head of the steel pipe pile 31 and the core of the steel pipe pile 31 and the core of the joining unit 32 are made to coincide, the steel pipe pile 31 and the joining unit 32 are welded (or attached plates and (Via bolts and nuts)
And the front-end | tip part of pillar 11a, 21a is inserted in the interior space of the joining unit 32 through the opening end of the joining unit 32, and the position of pillar 11a, 21a is moved to a predetermined installation position using the positioning device mentioned later. .
In this state, the concrete 34 is filled into the internal space of the joining unit 32, the joining unit 32 and the pillars 11a and 21a are joined, and the construction of one foundation structure is completed.
As a positioning device for the columns 11a and 21a inserted into the joining unit 32, for example, the one disclosed in Japanese Patent Application No. 2005-120666 filed on April 19, 2005 by the present applicant. Can be adopted.

If such 1 pillar 1 pile foundation structure 30 is used, since the steel pipe pile 31, the joining unit 32, and the pillars 11a and 21a will be carried in to a construction site as a separate member, respectively, simplification of a carrying-in operation | work is simplified. Can be planned.
Moreover, according to the construction method of this 1 pillar 1 pile foundation structure 30, the steel pipe pile 31, the joining unit 32, and the pillars 11a and 21a are each carried into a construction site as a separate member, and these members are the steel pipe pile 31 of Since the core is aligned with the core of the joining unit 32 and the positions of the pillars 11a and 21a are adjusted and then assembled with the joining unit 32, the pillar after the assembly is assembled even if the steel pipe pile 31 has a placement error. The positions of 11a and 21a can be accurately determined, and pile construction errors can be absorbed.

As shown in FIG. 1 or FIG. 3, the above-mentioned seismic braces 12, 22, and 23 do not need to be installed over all the layers from the bottom layer to the top layer, and are at least shown by broken lines in FIG. In addition, it is only necessary to install a pair of opposing surfaces (so as to form a letter C). Further, as indicated by a solid line in FIG. 5, a pair can be installed on each pair of opposing surfaces.
The place where the seismic braces 12, 22, and 23 are installed instead of the vertical brace without the seismic control function varies depending on the structure of the entire supporting steel frame, the weight of the suspended boiler body, etc. Absent. The installation locations of the vibration control braces 12, 22, and 23 are determined based on the strength calculation of the support steel frames 11 and 21, and the result of the vibration control calculation.

Needless to say, the seismic control frame of the present invention can also be applied to plant equipment and the like suspended on a support steel frame in the same manner as the boiler structure.
Furthermore, although these devices are not in a suspended state, they are supported by the middle part to the upper layer part of the supporting steel frame, and the structure in which the dead load weight is transmitted from the upper side to the supporting steel like the present invention. Needless to say, it can also be applied to systems.

It is a schematic structure figure showing a 1st embodiment of a damping control support structure of a boiler by the present invention. It is a graph for comparing the analysis result performed using the damping control support structure of the boiler shown in FIG. 1, and the analysis result performed using the conventional damping control support structure. It is a schematic block diagram which shows 2nd Embodiment of the damping control support structure of the boiler by this invention. It is a sectional side view of the 1 pillar 1 pile foundation structure suitable for use in the damping control support structure of the boiler by this invention. It is a schematic block diagram which shows other embodiment of the damping control support structure of the boiler by this invention.

Explanation of symbols

10 Damping support structure 11 Supporting steel frame 11a Column 12 Damping brace 20 Damping support structure 21 Supporting steel frame 21a Column 22 First damping brace 23 Second damping brace B Boiler body

Claims (3)

A supporting steel frame that includes a pillar, a horizontal brace, and a vertical brace and supports the boiler body;
A boiler vibration control support structure comprising a suspension member suspended from the support steel frame and suspended to support the boiler body so as to allow expansion and contraction due to heat,
A seismic brace having a seismic control function is provided instead of the vertical brace, and these seismic braces are configured to have a larger yield point toward the lower floor. Damping support structure.   A boiler facility comprising the boiler vibration control support structure according to claim 1 and a boiler body. A supporting steel frame that includes a pillar, a horizontal brace, and a vertical brace and supports the boiler body;
It is a seismic retrofitting method for a seismic support structure of a boiler that is suspended on the support steel frame and includes a suspension member that supports the boiler body so as to allow expansion and contraction due to heat.
A seismic retrofitting method for a seismic support structure for a boiler, which is characterized by removing the existing bracing vertical brace and installing a seismic bracing with a higher yield point on the lower floor instead of the removed vertical brace. .

Images