JP6749213B2 - Seismic repair structure and method - Google Patents

Description

The present embodiment relates to a vibration control type seismic repair structure for an existing structure such as a foundation of a turbine generator.

Existing structures such as reinforced concrete foundations for supporting turbine generators installed in thermal power plants are often designed only by static analysis using the allowable stress method.
In recent years, seismic resistance against seismic motion has been emphasized, and it has been confirmed that many parts (columns/beams) will be seismically resistant as a result of dynamic time-series response analysis of foundations already constructed. In many cases, the result is not sufficient. Common methods for reinforcing seismic resistance include adding braces, adding braces with outframes, reinforcing with iron plate winding, installing bearing walls, installing a vibration isolation table, and reinforcing with carbon fiber winding.

JP, 2013-087540, A JP, 2010-222802, A

The above-mentioned addition of braces, addition of braces by the out-frame, and reinforcement by iron plate winding have a problem that a space for installing members to be added cannot be taken because there are power generators and piping inside the base. In addition, the installation of bearing walls increases the weight of the foundation and increases the horizontal seismic force of the foundation. Further, the installation of the vibration isolation table cannot be installed unless the power generator is removed and the concrete foundation is partially disassembled, which requires time and cost. Carbon fiber winding may cause insufficient strength. Before the construction of the foundation, all of them are effective methods, but practically it is difficult to construct any foundation that already has power generators and pipes attached.

The present invention has been made in view of the above-mentioned problems, and with respect to an existing foundation, an earthquake-resistant repair structure and an earthquake-resistant repair that can improve the earthquake-resistant safety performance of the foundation without removing the power generator and wiring. The purpose is to provide a method.

The seismic repair structure according to the present embodiment is a seismic repair structure for a frame structure including a plurality of column bases standing upright on a foundation mat at predetermined intervals and beams provided between these column bases and column bases. Inside the frame on the first floor of the frame structure, there is a rectangular parallelepiped free-standing wall that stands up from the foundation mat at a distance from the frame, and one end is fixed to the free-standing wall and the other end is a column base. Alternatively, a plurality of buffers that are not fixedly contacted with the beam and are interposed between the self-supporting wall and the left and right column bases and the upper beam of the above-mentioned frame, and elastic between one end side and the other end side by an elastic body seismic repair structure comprising: the member.

FIG. 1 is a perspective view of a foundation of a turbine generator to which a seismic repair structure according to this embodiment is applied. FIG. 2 is an elevation view of the foundation stand viewed from A in FIG. FIG. 3 is a sectional view of the base taken along the line BB of FIG. FIG. 4 is a side view of the cushioning member. FIG. 5 is a front view of the cushioning member as viewed from C in FIG. FIG. 6 is a cross-sectional view of the cushioning member taken along the line D-D in FIG. FIG. 7 is a diagram showing a seismic repair structure with a gauge attached. FIG. 8 is a diagram showing the operation of the gauge when the base is rocked.

Hereinafter, the present embodiment will be described in detail with reference to the drawings. However, the same components are denoted by the same reference numerals, and overlapping description will be omitted.
FIG. 1 is a perspective view of a foundation of a turbine generator to which a seismic repair structure according to this embodiment is applied. FIG. 2 is an elevation view seen from A in FIG. FIG. 3 is a sectional view taken along the line BB in FIG. FIG. 4 is a side view of the cushioning member, and FIG. 5 is a front view seen from C in FIG. FIG. 6 is a cross-sectional view of the cushioning member taken along line D-D in FIG.

In the following description, the longitudinal direction of the base (X direction in Fig. 1) is the turbine axis direction, and the lateral direction of the base (Y direction in Fig. 1) is the direction orthogonal to the longitudinal direction of the base. And Further, one of the height directions (Z direction in FIG. 1) of the foundation table may be referred to as an upper side and the other may be referred to as a lower side.

As shown in FIGS. 1 to 3, the foundation table 1 has a frame structure composed of column bases and beams, and a plurality of column bases are erected on the foundation mat 2 at predetermined intervals. 11, a beam 12 connecting these column bases 11, and a deck portion 13.

The deck portion 13 has a plurality of openings 14, and a generator, a low-pressure turbine, and a high-pressure turbine (not shown) are arranged above the openings 14, respectively. Further, a condenser (not shown) is arranged on the base mat 2 on the lower side of the low-pressure turbine, and large-diameter pipes and phase-separating busbars are arranged on the lower part of the generator and the high-pressure turbine. .. The low-pressure turbine, the high-pressure turbine and the generator are fixed around the opening 14 of the deck portion 13 via a fixture such as a foundation bolt. The number of openings 14 is not particularly limited.

A plurality of frame structures (openings) 15 are formed by the column bases 11, the beams 12 and the deck portion 13 in the lateral direction of the base 1, and the column bases 11, the beams 12 and the deck are arranged in the longitudinal direction of the base 1. A plurality of frames (openings) 16 are formed by the part 13. Piping to equipment installed in the space in the base 1 can be penetrated through the frames 15 and 16. The number of frames 15 and 16 is not particularly limited, and increases or decreases depending on the number of column bases 11 and beams 12.

The base 1 can be composed of, for example, a reinforced concrete structure made of reinforcing steel and concrete. The base 1 is configured to have a height of, for example, 10 m to 20 m, a lateral length of, for example, 10 to 30 m, and a longitudinal length of, for example, 40 to 60 m. The length is arbitrarily set according to the size and the number. The base mat 2 has a thickness of about 3 m.

The earthquake-resistant repair structure 3 is composed of a self-supporting wall 3a and a cushioning member 3b. The self-supporting wall 3a has a rectangular parallelepiped shape and is installed in the frames 15 and 16 on the first floor of the foundation table 1. The self-supporting wall 3a is directly supported on the foundation mat 2. The self-supporting wall 3a has a predetermined space between the column base 11 and the beam 12 which form the frames 15 and 16.

The self-standing wall 3a is made of a member having high rigidity, and can be made of, for example, a reinforced concrete structure made of rebar and concrete. The self-standing wall 3a includes a plurality of cushioning members 3b at predetermined intervals on both side surfaces (right side and left side) facing the column base 11 and an upper surface facing the beam 12. In other words, the cushioning member 3b is interposed between the self-supporting wall 3a and the frames 15 and 16. The cushioning members 3b are symmetrically installed on both side surfaces of the self-standing wall 3a.

The cushioning member 3b has one end fixed to the self-standing wall 3a via a fixture 4 such as a bolt. On the other hand, the other end of the cushioning member 3b only contacts the column base 11 and the beam 12 which face each other, and is not fixed. The number of the cushioning members 3b is not particularly limited, but the larger the number, the more the reaction force on the existing frame (frame) can be dispersed without being concentrated.

As shown in FIGS. 4 to 6, the cushioning member 3b includes an elastic body 31b and a housing (elastic body storage box) 32b for housing the elastic body 31b. The elastic body 31b may be, for example, a spring, and the housing 32b includes an inner lid (first lid) 33b fixed to the self-standing wall 3a, and an outer lid (first lid) fitted (fitted) with the inner lid 33b. Second lid) 34b.

The inner lid 33b is a cylindrical member having a closed end 35b on one side, and a substantially rectangular notch (hereinafter, also referred to as “inner lid notch”) 36b is formed on the outer peripheral surface. The closed end 35b has a hole 37b through which the fixture 4 such as a bolt passes. The inner lid 33b is fixed to the self-supporting wall 3a via the fixture 4. Further, an elastic body pedestal (hereinafter, also referred to as “inner lid pedestal”) 38b that supports the elastic body 31b is provided at the closed end 35b.

The elastic pedestal 38b has an adjusting portion 39b, and is slidable in the axial direction of the inner lid 33b by the adjusting portion 39b. Further, the closed end 35b is provided with a guide plate 40b for guiding the elastic body 31b from the notch 36b to the elastic body pedestal 38b. The outer peripheral surface of the inner lid 33b has a coating layer 41b coated with a material having a small frictional resistance, for example, Teflon (registered trademark).

The outer lid 34b is a cylindrical member having a closed end 42b on one side, and has a notch 36b on the outer peripheral surface that is substantially the same as the notch 36b formed in the inner lid 33b (hereinafter, also referred to as "outer lid notch"). ) 43b is formed. The closed end 42b is provided with an elastic body pedestal (hereinafter, also referred to as “outer lid pedestal”) 44b that supports the elastic body 31b at a position corresponding to the inner lid pedestal 38b. Similarly to the inner lid 33b, a guide plate 45b for guiding the elastic body 31b from the cutout 43b to the elastic body pedestal 44b is provided on the closed end 42b.

A coating layer 41b coated with a material having a small frictional resistance, for example, Teflon (registered trademark), is provided on the inner peripheral surface of the outer lid 34b and the surface of the closed end 42b that contacts the column 11 and the beam 12. The inner diameter of the outer lid 34b (including the coating layer 41b) is approximately the same as the outer diameter of the inner lid 33b (including the coating layer 41b).

The outer lid 34b into which the inner lid 33b is fitted is slidable in the fitting direction (axial direction) of the inner lid 33b and rotatable about the axial center, and the inner lid cutout 36b and the outer lid cutout 43b. By aligning the positions, the loading/unloading opening 46b for loading/unloading the elastic body 31b is formed. The movement amount of the outer lid 34b (double-headed arrow m in FIG. 6) is adjusted to at least 50 mm or more, with the maximum interlayer deformation angle of concrete being 1/200.

The elastic body 31b housed in the housing 32b expands and contracts only in the X direction and does not laterally shift in the Y direction and the Z direction with respect to the X direction seismic wave, for example. The number of seismic retrofit structures 3 is not particularly limited, but the larger the number of seismic retrofit structures 3, the better the seismic resistance of the foundation 1.

Further, the seismic repair structure 3 according to the present embodiment is provided with the elastic body 31b when an earthquake occurs by attaching the gauges 3c that measure the displacement amount of the buffer member 3b to both side surfaces (left side and right side) of the self-standing wall 3a. It is possible to grasp how much has contracted. Thereby, the amount of movement (displacement) of the existing frame (frame) can be grasped.
The cushioning member 3b may have a form in which the outer lid 34b is fixed to the self-standing wall 3a, that is, the outer lid 34b serves as a first lid and the inner lid 33b serves as a second lid.

Hereinafter, the seismic repair structure 3 with the gauge 3c attached will be described in detail with reference to FIGS. 7 and 8. FIG. 7 is a diagram showing an earthquake-resistant repair structure to which a gauge 3c is attached. FIG. 8 is a diagram showing the operation of the gauge 3c when the base is rocked.

As shown in FIG. 7, the gauge 3c includes a gauge core 31c extending horizontally from the self-standing wall 3a and a gauge needle 32c slidably supported by the gauge core 31c. One end of the gauge core 31c is fixedly supported by the self-standing wall 3a. The gauge core 31c is provided with a scale in mm so that the movement amount (displacement amount) of the gauge needle 32c can be seen. The gauge core 31c extends in the direction of the housing 32b and is in contact with the opening side of the outer lid 34b.

When the outer lid 34b moves toward the self-supporting wall 3a, the gauge needle 32c also moves accordingly. That is, the gauge needle 32c moves along the gauge core 31c in the direction in which the elastic body 31b contracts. On the other hand, the gauge 3c does not move in the direction of the existing frame (frame), that is, in the direction in which the elastic body 31b extends. Therefore, the gauges 3c are installed on both side surfaces (left side and right side) of the self-standing wall 3a. As a result, as shown in FIG. 8A, the gauge 3c (arrow b) on the right side is displaced with respect to the shake in the a direction. In this case, the gauge 3c on the left side is not displaced.

On the other hand, as shown in FIG. 8B, the gauge 3c (arrow d) on the left side is displaced with respect to the shake in the c direction, which is the opposite direction to the a direction. In this case, the gauge 3c on the right side is not displaced. In this way, the bidirectional displacement in the direction of the self-supporting wall 3a and the direction of the existing frame can be measured visually or by measurement. The gauge 3c shall be capable of recording at least 50 mm or more with the maximum interlayer deformation angle of concrete being 1/200. Further, it is preferable that the gauges 3c attached to both side surfaces (left side and right side) of the self-supporting wall 3a have the same height.

In the seismic repair structure 3 with the gauges 3c attached, a plurality of cushioning members 3b are installed at equal intervals in the height direction, and by mounting the gauges 3c corresponding to each cushioning member 3b, the displacement amount after the earthquake is accumulated. , It is possible to observe the maximum displacement mode in the height direction of the existing frame.

The seismic repair structure according to this embodiment is installed on an existing structure according to the following procedure.
First, the self-supporting wall 3a is installed on the foundation mat 2, and a hole is drilled at a position where the anchor bolt (fixing tool 4) is attached. Next, the housing 32b in which the inner lid 33b is fitted into the outer lid 34b is inserted into the gap between the existing frame (framework) and the self-standing wall 3a installed.

After that, the elastic body 31b having an appropriate spring coefficient is inserted from the loading/unloading opening 46b of the housing 32b along the guide plates 40b and 45b, and installed on the inner lid pedestal 38b and the outer lid pedestal 44b. The outer lid 34b is slid through the elastic body 31b by the adjusting portion 39b of the inner lid pedestal 38b, and the closed end 42b of the outer lid 34b is brought into contact with the existing frame (frame).

When the gauge 3c is attached, the gauge 3c is attached to the self-supporting wall 3a in the vicinity of the buffer member 3b, and the gauge needle 32c is placed at a position in contact with the opening side of the outer lid 34b. In the same manner, a plurality of cushioning members 3b are attached to the right side, the left side, and the upper three sides.

In this way, the seismic repair structure 3 according to the present embodiment can be installed on the foundation 1 without stopping the power generation equipment or the like. Further, since the seismic repair structure 3 (self-supporting wall 3a, cushioning member 3b and gauge 3c) according to the present embodiment is not attached and fixed to the existing foundation base 1, further load is not applied to the existing foundation base 1 (structure). It does not take. Therefore, after the seismic repair structure 3 is attached, it is not necessary to newly perform structural calculation such as stress analysis on the foundation 1.

Also, seismic repair structure 3 according to this embodiment, by the action of the buffer member 3b, 2 floor floor against time history input seismic waves of the ground surface, the acceleration of the time history response at the third floor floor smaller, upper floors It can be expected to reduce the input seismic force of. As a result, it is possible to ensure the seismic capacity of the existing frame (column base 11 and beam 12).

Also, seismic repair structure 3 according to this embodiment, since the mounted upstairs floor under the first floor floor, each member constituting the frame of the second floor above (column base 11, the beams 12 and deck portion 13) The amount of displacement can be kept small. In addition, by suppressing the amount of displacement of the foundation base 1 during an earthquake, damage to equipment such as turbine generators and piping installed on the upper floors can be reduced. The time to restart the power plant can be shortened.

Further, by providing the gauge 3c, the movement amount (displacement amount) of the existing frame (frame) can be measured by the gauge 3c, and therefore the existing frame (frame) or the frame is fixed based on this movement amount (displacement amount). It is possible to make a prediction of the degree of damage to pipes and equipment.

The seismic repair structure 3 according to the present embodiment needs to have an existing lower structure (base mat) that can withstand an increased load without being added or modified even if the self-weight of the self-supporting wall increases. Therefore, a structure having such a lower structure can be applied to not only the above-described base stand of the turbine generator but also a general building.

Although the embodiment of the present invention has been described above, the present embodiment is presented as an example and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. The present embodiment and its modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the scope equivalent thereto.

1… Base (upper structure)
2… Foundation mat (substructure)
3… Seismic repair structure
3a…Independent wall (reaction wall)
3b…Cushioning member
3c… Gauge
11… Pillars
12… Beam
13… Deck section
15,16… Frame (opening)
31b… Elastic body
32b…Case (elastic body storage box)
33b… Inner lid (first lid)
34b… Outer lid (second lid)
38b… Elastic base
39b… Adjuster

Claims (10)

A seismic repair structure for a frame structure comprising a plurality of column bases erected at a predetermined interval on a foundation mat and beams provided between these column bases,
Inside the frame of the first floor part of the frame structure, a rectangular parallelepiped self-standing wall that is erected from the foundation mat at a distance from the frame,
One end side is fixed to the self-supporting wall and the other end side is brought into non-fixed contact with the column base or the beam, and is inserted between the self-supporting wall and the left and right column bases and the upper beam in the frame . A plurality of cushioning members between the one end side and the other end side that can expand and contract by an elastic body ,
A seismic repair structure characterized by being equipped with. The seismic repair structure according to claim 1, wherein the cushioning member has one end side fixedly supported to the self-supporting wall by a bolt . The cushioning member ,
A housing comprising a second lid which is in contact with the first lid and the first lid and slidably fitted the Frames which are fixedly supported by the front Symbol self wall,
An elastic body housed in the housing and capable of expanding and contracting between the first lid and the second lid,
An adjusting unit that adjusts the position of the second lid by adjusting the position of the elastic body,
The earthquake-resistant repair structure according to claim 2, further comprising: 4. The gauge according to claim 3 , further comprising a gauge attached to the self-supporting wall and configured to measure a displacement amount between the one end side and the other end side of the cushioning member according to the movement of the second lid . Earthquake-resistant repair structure. The buffer member, the mating surfaces to each other sliding of said first lid and said second lid, to have a coating layer for reducing the frictional resistance to claim 3 or 4, characterized in Seismic repair structure described. The said buffer member has a coating layer which reduces frictional resistance in the surface which contacts the said column base or the said beam of the said 2nd lid, The any one of Claim 3 thru|or 5 characterized by the above-mentioned. Earthquake-resistant repair structure. The seismic repair structure according to any one of claims 1 to 6, wherein the buffer member is symmetrically provided on both side surfaces of the self-supporting wall. The seismic repair structure according to any one of claims 1 to 7, wherein the cushioning members are provided at equal intervals in the height direction. A seismic repair method for a frame structure comprising a plurality of column bases standing upright on a foundation mat at predetermined intervals and a beam provided between these column bases,
Inside the frame of the first floor portion of the frame structure, a self-supporting wall installation step of standing a rectangular parallelepiped self-supporting wall spaced from the frame from the foundation mat,
Between the self-supporting wall and the left and right column pedestals and the upper beam in the frame, a plurality of cushioning members capable of expanding and contracting with an elastic body between one end side and the other end side , respectively, the one end side to the self-supporting wall A cushioning member installation step of installing the other end side of the column base and the beam in a non-fixed manner while fixing the same ;
A seismic repair method characterized by including. The cushioning member,
A housing comprising a first lid fixedly supported by the self-supporting wall and a second lid slidably fitted to the first lid and in contact with the frame;
An elastic body housed in the housing and capable of expanding and contracting between the first lid and the second lid,
Equipped with
The method further comprises a gauge setting step of attaching a gauge to the self-standing wall to measure a displacement amount between the one end side and the other end side of the cushioning member according to the movement of the second lid. Seismic repair method described in 9.

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