JP2012067705A - Turbine generator frame in power generation equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently improve earthquake resistance in a turbine generator frame which is a pedestal for supporting a turbine and a generator installed on a power generation facility.SOLUTION: In the turbine generator frame, when improving the earthquake resistance of a turbine generator frame, bases of columns of only the lower section of the turbine generator frame are expanded at least in one direction of the axial direction of the turbine generator or the direction orthogonal thereto, or the spacing of the bases of the columns is expanded at least in one direction of the axial direction of the turbine generator or the direction orthogonal thereto to the outer side of the turbine generator frame, and any increase of the bending moment generated by the increase in the self weight of the bases of the columns is suppressed.

Description

  The present invention relates to a turbine generator support frame constructed in a turbine building in a power generation facility having a turbine such as a thermal power plant or a nuclear power plant.

  With the occurrence of large-scale earthquakes in recent years, further improvement in seismic strength has been demanded in various plant facilities, and improvement in seismic strength is also a major issue in power generation facilities such as thermal power plants and nuclear power plants. In particular, the turbine generator support frame built in the turbine building, which is an important element of the power generation equipment, needs to have sufficient strength.

  A typical turbine generator frame in the prior art will be described with reference to FIGS. In general, the turbine generator base 1 has a ramen structure composed of column bases and beams formed of reinforced concrete as shown in FIG. 7, and the column base 2 and the beam 3 connecting the column bases 2. And a wall 4 provided between the column bases 2, and a gantry floor 5 on which a turbine, a generator, and auxiliary equipment are placed. As shown in FIG. 8, the turbine generator base 1 can be broadly divided into an upper part A that directly supports the turbine equipment and the generator equipment, and a lower part of the base that transmits the supported load to the floor of the building and ensures seismic performance. Consists of B.

  The turbine generator base 1 is constructed on the foundation mat floor 6 of the building 10 and is surrounded by a structure including a column base 7, an operating floor 8, a beam 9, and the like. The turbine generator base 1 has a structure that rises vertically from the foundation mat floor 6 in substantially the same shape, because of its fit with the structure and workability. The turbine generator frame 1 is constructed so as to be structurally separated from the structure of the building 10.

  As a technique for improving the earthquake resistance of the turbine generator frame, one described in Patent Document 1 is known. The turbine generator frame 1 shown in FIGS. 9 and 10 has a ramen structure having a column base 2, a beam 3, and a frame floor 5, and turbines 12, 13 are added to the turbine generator frame 1 provided in the building 10. And the generator 11, and the seismic walls 15, 16 made of retaining walls (buttresses) projecting to the outside of the turbine generator frame 1 in the same direction as the connecting axis direction of the turbine and the generator or in a direction perpendicular thereto. To improve seismic strength.

Japanese Patent Laid-Open No. 5-126296

  Conventionally, the main design item for improving the seismic strength of a reinforced concrete turbine generator frame is the number of reinforcing bars arranged in the cross section of a column such as a column base or a beam (the amount of reinforcing bars). In the construction of columns and beams, it is necessary to sufficiently fill the concrete around the reinforcing bars in the cross section of the frame in order to ensure the strength of the reinforced concrete. Since the reinforcing bars to be used are large diameters of about 50 mm in diameter and installed at intervals of 200 mm, for example, in the case of a normal construction method, the number of reinforcing bars arranged, that is, the number of reinforcing bars arranged in the cross section of the casing is at most four. There is a practical restriction that the limit is the construction limit.

  However, especially when considering the high earthquake resistance of the turbine generator frame, the number of reinforcing bars required for the column cross section of the column base may increase due to the increase in seismic load. It was contrary to that.

  In order to improve the seismic strength, it is necessary to expand the column base width. However, the turbine generator mount usually has almost the same shape from the foundation mat floor to the operation floor due to workability and fit with the building side. Standing vertically. Therefore, when the column base width is increased and the weight of the column base increases, the weight of the upper part of the turbine generator base becomes larger than before, which increases the bending moment against the seismic load, which in turn reduces the burden on the lower part of the column base. It falls into the dilemma of increasing.

  The turbine generator frame described in Patent Document 1 takes this into consideration, and an increase in the size of the column base and an increase in the weight of the upper part of the frame can be avoided. However, the workability deteriorates because the bar arrangement is different between the column base and the earthquake-resistant wall. In addition, since the seismic walls 15 and 16 and the structures 7, 8 and 9 of the building 10 are separated, when the seismic wall 15 is installed at the lower part of the structures 7, 8 and 9 of the building 10, Turbine generator frame and building-side frame structure are complicated and workability deteriorates.

  The present invention relates to a turbine generator frame having a rigid frame structure made of reinforced concrete and surrounded by a structure in a turbine building, and a frame floor on which the turbine and the generator are mounted, and supports the frame floor The bending moment strength of only the lower part of the gantry is increased in the turbine generator gantry in the power generation facility having the gantry upper part having the column base to be supported and the gantry beam supporting the upper part of the gantry upper part to the turbine building foundation and the lower part of the pillar base. It is characterized by that.

  Further, in the turbine generator frame, in order to increase only the column base size of the column base column base of the turbine generator frame, the bending moment strength is increased by widening in at least one of the axial direction of the turbine generator or the direction orthogonal thereto. It is characterized by increasing the seismic strength.

  Further, in the turbine generator frame, the interval between the gantry lower column bases is orthogonal to the axial direction of the turbine generator or perpendicular to the direction in which the seismic strength is required for the lower column pedestal part of the turbine generator frame. The frame structure is expanded in the direction to increase the frame structure strength of the turbine generator frame, thereby improving the seismic strength.

  Further, in the turbine generator frame, the interval between the lower column bases of the turbine generator frame is expanded in at least one of the axial direction of the turbine generator or the direction orthogonal thereto, and the seismic strength is improved. It is characterized by.

  In the turbine generator frame according to the present invention, the column base at the bottom of the turbine generator frame is configured to increase the bending moment strength with respect to the same direction as the turbine and the generator axial direction or a direction perpendicular thereto. The rigidity of the generator base is increased, and sufficient seismic strength can be provided without increasing the amount of reinforcing bars against the seismic force generated in the axial direction or the perpendicular direction of the turbine and the generator.

  Also, by increasing the bending moment strength only at the lower part of the turbine generator frame, the increase in the weight of the upper part of the turbine generator frame is suppressed, and as a result, the generation of excessive bending moment is suppressed, further improving the seismic strength. An effective configuration can be realized.

Schematic diagram showing Example 1 of the present invention Schematic diagram showing Example 2 of the present invention Schematic showing Example 3 of the present invention Schematic showing Example 4 of the present invention The perspective view of the turbine generator frame by Example 2 of this invention Schematic diagram of a turbine generator frame according to Embodiment 2 of the present invention Perspective view of a conventional turbine generator frame Schematic diagram of a conventional turbine generator frame Perspective view of another conventional turbine generator frame Sectional view of another conventional turbine generator frame

  Hereinafter, embodiments of the present invention will be described with reference to the respective examples and drawings.

  FIG. 1 shows a first embodiment of the present invention. Reference numeral 1 is a turbine generator base, 2 is a column base, 3 is a base beam, and 5 is a base floor. The turbine generator gantry 1 includes a gantry upper part A that directly supports the turbine equipment and the generator equipment, and a gantry lower part B that transmits the supported load to the foundation mat floor of the building and ensures seismic performance. The dotted line is the central axis of the column base.

  The column base 2 is widened by adding reinforcing portions S to both sides of the column base 2 in the lower base B of the turbine generator base 1. The reinforcing portion S is formed integrally with the column base 2 and its strength is the same as that of the column base having the same width. With this configuration, only the lower part B of the turbine generator base 1 is widened and the bending moment strength is increased, while the own weight of the upper part A is not increased. Therefore, the bending moment generated by the increase in the own weight as well as the seismic strength is increased. The increase in is minimized.

  In this case, the center axis of the column base including the reinforcing portion S is in the same position as the conventional pier. In addition, the size of both positions is designed so that the reinforcing portion S and the structure of the building 10 do not interfere with each other.

  FIG. 2 shows a second embodiment of the present invention. A reinforcing portion S is added only to the outside of the column base 2 of the lower mount B to widen the column base 2. The reinforcing portion S is formed integrally with the column base 2 and its strength is the same as that of the column base having the same width. As for the central axis of the column base 2 at the base B, the central axis of the base B is moved outward from the central axis of the base A, and the structure has a stronger and stable frame structure. I understand.

  Hereinafter, a specific configuration of the turbine generator frame of the second embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a perspective view according to the second embodiment, and FIG. 6 is a schematic diagram of a cross section perpendicular to the turbine and generator axial direction of the turbine generator frame.

  As shown in FIGS. 5 and 6, the lower structure of the turbine generator frame 1 has a structure in which the column base of the mount lower column base 17 is widened outwardly with respect to the mount upper column base 19 of the turbine generator mount. Yes.

  Generally, the seismic load generated on the column base and beam of the turbine generator base 1 when an earthquake occurs is determined by the rigidity of each member. Therefore, the rigidity of each member on the turbine side and the generator side is distributed and balanced in a balanced manner. It is important that the entire turbine generator mount is not twisted. Therefore, the width expansion dimension or the column base interval between the column bases is determined by structural analysis or the like so that the rigidity sharing between the turbine side and the generator side is most balanced in the turbine generator frame.

  A case where a horizontal seismic force is applied to the turbine building 10 including the turbine generator frame 1 having the above-described configuration will be described. In the second embodiment, the bending moment strength can be increased without increasing the bending moment due to the increase in the weight of the upper portion of the turbine generator base 1, and the conventional turbine generator base can withstand a greater seismic force. Further, as a result of the above, the rigidity of the turbine generator gantry 1 is improved, so that the seismic displacement of the turbine generator gantry 1 is reduced, which is advantageous in terms of equipment and piping design. Moreover, when assuming the same seismic force as before, the number of reinforcing bars arranged in the cross section of the turbine generator pedestal column base 17 can be greatly reduced, and workability can be improved.

  Next, a third embodiment of the present invention will be described with reference to FIG. In Example 3, the width L of the column base 2 of the gantry lower part B to which the reinforcing portion S is added is the same as that of the column base 2 of the gantry upper part A, and only the distance between the column bases is widened to make the turbine generator base 1 high in strength. It has a ramen structure. As a result, the seismic strength can be improved without substantially increasing the weight of the turbine generator base 1.

  Next, a fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, the column base 2 at the lower part B of the gantry is widened, the interval between the column bases is widened, the turbine generator gantry 1 has a high-strength ramen structure, and the bending moment strength of the pedestal 2 itself is improved. Yes. According to this structure, the seismic strength of the turbine generator base 1 can be greatly improved.

  As described above, according to the present invention, the gantry lower part of the turbine generator gantry base is widened in the same direction as the turbine and generator axial direction or in a direction perpendicular thereto, and / or to the outside of the turbine generator gantry. Increase the column base interval.

  According to this, for earthquakes of the same magnitude as in the past, the earthquake displacement of the turbine generator frame is reduced, making it easier to design equipment and piping, and a greater seismic force than the conventional turbine generator frame. Will be able to withstand.

  Moreover, since the generated earthquake load is averaged over the entire turbine generator frame, the amount of reinforcing bars is averaged and the workability of the turbine generator frame is improved. Moreover, when assuming the same seismic force as before, the number of reinforcing bars can be reduced, and the workability is improved. Furthermore, since there is room in the space around the condenser, it is easy to route the internal and external piping.

  The present invention can be applied to structures such as various plants that require further improvement in earthquake resistance as a countermeasure against earthquakes and need to improve the earthquake resistance.

DESCRIPTION OF SYMBOLS 1 ... Turbine generator base 2 ... Column base 3 ... Base beam 5 ... Base floor 6 ... Foundation mat floors 7, 8, 9 ... Structure 10 ... Turbine building 17 ... Base lower column base 19 ... Base upper column base A ... Upper part B ... Lower part S ... Reinforcement part

Claims (4)

A turbine generator frame having a rigid frame structure made of reinforced concrete and surrounded by a structure in a turbine building, comprising a frame floor on which the turbine and the generator are mounted, and a column base that supports the frame floor In a turbine generator frame in a power generation facility having a frame upper part and a frame lower part made up of a beam beam and a column base for supporting the frame upper part on a turbine building foundation,
A turbine generator frame characterized in that the bending moment strength of only the lower part of the frame is increased.   2. The turbine generator frame according to claim 1, wherein a reinforcing portion is added to a column base of the turbine generator frame so that the turbine generator frame is widened in at least one direction of an axial direction of the turbine generator or a direction orthogonal thereto. Turbine generator mount with increased bending moment strength and improved seismic strength.   2. The turbine generator frame according to claim 1, wherein an interval between the column bases of the turbine generator frame is expanded in at least one direction of an axial direction of the turbine generator or a direction orthogonal thereto, and Turbine generator frame characterized by increasing the frame structure strength of the machine frame and improving earthquake resistance.   3. The turbine generator frame according to claim 2, wherein an interval between the frame lower column bases of the turbine generator frame is expanded in at least one direction of an axial direction of the turbine generator or a direction orthogonal thereto, and the seismic strength is increased. Turbine generator mount that is improved.

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