JP2003064624A - Earthquake resistant reinforcing method of existing reinforced concrete elevated bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress propagation of traffic vibrations while securing the earthquake resistant safety of an existing reinforced concrete elevated bridge. SOLUTION: Gusset plates 8, 9 are protrusively installed at least at two spots opposed to each other in a sloped direction among the legs of bridge legs 1, the heads of bridge legs 1, the middle of beams 2, or the middle of girders 3. Between the opposed gusset plates 8, 9, a brace-type damper 6 having a brace body 61 into which a damper 62 is incorporated is constructed, and both ends of the damper 6 are coupled to the gusset plates 8, 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides seismic safety to existing reinforced concrete viaducts used as railway bridges and road bridges, while at the same time, the ground around the vibration of traffic generated by trains and vehicles running on slabs. The present invention relates to a seismic retrofitting method for existing reinforced concrete viaducts that suppresses the propagation to the earth.

[0002]

2. Description of the Related Art Reinforced concrete viaducts used as railway bridges and road bridges are constructed by connecting bridge piers parallel to each other in the direction perpendicular to the bridge axis with beams and connecting bridge piers adjacent to each other in the bridge axis direction with girders. It is constructed with a connected ramen structure, but since it has a single span in the direction perpendicular to the bridge axis,
Since the rigidity is smaller than in the bridge axis direction, shaking easily occurs,
I am worried about seismic safety during an earthquake.

In particular, since the shear span ratio of the beam tends to decrease in the direction perpendicular to the bridge axis, when an excessive seismic force is applied in the direction perpendicular to the bridge axis, the beam causes shear failure due to a bending moment due to a horizontal force. there is a possibility.

As a method for seismic strengthening an existing viaduct, a method of winding steel plates, concrete, reinforcing fibers or the like around bridge piers, beams or girders to increase the cross section of the skeleton, and a method of erectioning braces in the surface are considered. However, the former method requires large-scale construction because it is necessary to reinforce all piers and beams.

When the brace is erected, it is necessary to project a gusset plate for receiving the brace near the leg or head of the pier or near the joint of the beam or girder with the pier. Since it is necessary to drive an anchor for fixing into concrete in order to join the base plate and the steel frame, etc., which are integrated into the skeleton to the skeleton, there is a risk of damaging the existing skeleton and damaging the reinforcing bars.

On the viaduct, if measures are not taken to suppress the propagation of traffic vibrations generated by trains and vehicles traveling on slabs, the vibrations propagate from the piers to the ground through the foundations, and therefore the surrounding private houses will be affected. Also, it may affect the habitability.

As a method of preventing the propagation of traffic vibration to the surrounding ground, there is a method of forming an anti-vibration groove in the ground to insulate the ground under the viaduct from the surrounding ground. Is not an efficient method because it requires continuous formation of vibration isolation grooves along the viaduct. In particular, in order to simultaneously solve the seismic reinforcement of the existing viaduct and the suppression of vibration as described above, construction on the viaduct and construction on the ground are required, so the construction target is expanded and the construction becomes complicated.

From the above background, the present invention proposes a method for suppressing the propagation of traffic vibration while ensuring the seismic safety of existing viaducts.

[0009]

According to the present invention, at least two portions of the pier legs, the pier head, the middle portion of the beam, the middle portion of the girder, etc. facing each other in the inclined direction are provided. A gusset plate is projected on the gusset plate, and a brace type damper with a damper incorporated in the brace body is installed between the opposing gusset plates, and both ends of the brace type damper are connected to the gusset plate to install the brace type damper for the existing viaduct. With this alone, the seismic reinforcement of the viaduct and the suppression of vibration can be solved simultaneously.

When the foundations of the adjacent piers are connected by footings, the pier legs, the pier head, the footing, the middle part of the beam, or the girders of the pier as claimed in claim 2. Gusset plates are provided so as to project at least at two positions facing each other in the inclined direction in any one of the intermediate portions. As for footing, in addition to connecting piers parallel to each other in the direction orthogonal to the bridge axis, there are also cases where piers adjacent to each other in the bridge axis direction are connected.

When a brace is simply installed between the leg portion of one of the piers and the head portion of the other of the piers that are adjacent to each other in the direction perpendicular to the bridge axis or in the bridge axis direction, the head of the pier is usually used. A gusset plate is projected at the joint between the bridge and the beam or girder, but the joint is a part where the main reinforcement of the pier and the main reinforcement of the beam are mixed and the shearing force at the time of an earthquake increases, so the gusset Retrofitting the plate to the joint may reduce the yield strength of the joint.

On the other hand, in the present invention, the gusset plate to which the brace-type damper is connected is provided so as to protrude from the leg or footing of the pier with the joint removed and the head of the pier or the middle of the beam or girder. As a result, the influence on the bar arrangement at the joint is avoided. In particular, if the gusset plate is joined to the band plate surrounding the pier as described in claim 3, the effect of reinforcing the legs and the head of the pier can be obtained.

High-frequency vibrations generated by trains and vehicles running on slabs are absorbed by the dampers of the brace-type dampers, and particularly viscous dampers are used as the dampers so that even small vibrations can effectively absorb vibration energy. Therefore, by keeping the brace-type damper in a functioning state at all times, it is possible to prevent traffic vibration from propagating from the pier to the surrounding ground through the foundation and reaching the surrounding private houses.
Since vibrations generated by trains and vehicles propagate to the foundation through the pier, it is effective to connect one end of a brace-type damper to the head of the pier in order to reduce traffic vibration.

As described above, in the viaduct, since shear failure is likely to occur in the beam connecting the piers adjacent to each other in the direction perpendicular to the bridge axis, in order to prevent the shear failure of the beam, the brace type damper is mainly constructed in the direction perpendicular to the bridge axis. Although it is erected in the plane, the brace-type dampers are installed not only in the construction plane in the direction perpendicular to the bridge axis but also in the construction plane in the bridge axis direction. The effect is improved.

The gusset plate projecting from the leg portion or the head portion of the pier is joined to the band plate fixed to the pier so as to surround the pier as claimed in claim 3. The band plate basically surrounds the pier and is fixed to the pier by being filled with a filling material such as mortar or an adhesive which is filled between the pier and the surface of the pier.

In the case where there is a possibility that the tension or compression force from the brace type damper may not be sufficiently transmitted to the pier by the fixing of the band plate with the filling material, in contrast to the tension or compression force from the brace type damper. Is integrated with the wrapping concrete in a state of surrounding the wrapping concrete constructed around the pier legs as described in claim 4.

In this case, the tensile force and compressive force from the brace type damper are transmitted to the pier and footing through the root-wrapping concrete.

When the viaduct has two layers, band plates are arranged at the head of the lower pier and the leg of the upper pier, and each band plate is joined to the pier by filling mortar or adhesive. However, the band plates are connected to each other by connecting the diaphragms, which are joined to the respective facing surfaces of the band plates, with a tension member as described in claim 5.

In this case, the vertical component of the tensile force from the brace type damper is transmitted to the bridge pier, the beam and the girder from the diaphragm of the band plate which is opposed through the tensile member, and the horizontal component is directly transmitted from the band plate to the bridge pier. The vertical component of the compressive force from the brace damper is transmitted from the diaphragm to the beam or girder, and the horizontal component is transmitted from the band plate directly to the pier.

According to the third to fifth aspects, the band plate on which the gusset plate is projected is fixed so as to surround the bridge pier, so that the existing skeleton is not damaged due to the projecting of the gusset plate. On the contrary, since the band plate surrounds the pier, the axial force from the brace-type damper can be dispersed and transmitted to the pier in the section corresponding to the axial length of the band plate. Not only is it prevented from serious damage, but it also has the effect of restraining concrete and increasing the strength of the pier.

The gusset plates protruding from the middle portion of the beam or the middle portion of the girder are arranged on both sides of the beam or the girder as claimed in claim 6, and the gusset plate is connected to the beam or the girder. It is fixed to the beam or girder by the material. The axial force from the brace damper is transmitted to the beam and girder through the gusset plate and the connecting material.

In this case, the beam or girder and the gusset plate are reinforced at the penetrating portion of the connecting material, or the entire gusset plate is stiffened to ensure transmission of the axial force from the brace damper to the beam or girder. In order to protect the connecting member, the gusset plate is covered with concrete together with the connecting member, except for the connecting portion of the gusset plate with the brace type damper as described in claim 7, if necessary.

In the case of claim 6, through-holes are formed in the beam or girder, but in claim 7, reinforcement of concrete around the portion where the gusset plate is fixed prevents a decrease in the proof strength of the beam or girder. Therefore, it becomes possible to improve the seismic performance without damaging the seismic performance of the existing viaduct.

A gusset plate projecting from the footing is constructed on the footing as claimed in claim 8 and is joined to a fixing member embedded in a concrete block integral with the footing. The axial force from the brace type damper is transmitted to the footing through the concrete block.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention, as shown in FIGS. 1 and 4, is arranged in parallel in the direction perpendicular to the bridge axis, and is arranged in parallel in the direction perpendicular to the bridge axis with bridge piers 1, 1 arranged at intervals in the direction of the bridge axis. Pier 1,1
For the existing reinforced concrete viaduct that consists of beams 2 that connect the bridges and girders 3 that connect the bridge piers 1 and 1 that are adjacent to each other in the bridge axis direction, in at least one of the bridge axis direction and the direction orthogonal to the bridge axis. Install a brace-type damper 6 between adjacent piers 1 and 1 or in a direction intersecting with them.
The viaduct has been given seismic safety and vibration control effects.

The viaduct may be a single layer shown in FIGS. 1 and 4 or a double layer shown in FIGS. 2 and 3. A rail track is laid on the beam 2 and the girder 3 located at the top. , Or a slab 4 that serves as a road is constructed.

The footing 5 constructed on the foundation portion of the pier 1 is independent for each pier 1, continuous as shown in the drawing, and piers 1, 1 arranged in parallel in the direction orthogonal to the pier axis, or adjacent to the pier direction. In some cases, the piers 1 and 1 may be connected.

The brace-type damper 6 is composed of brace bodies 61, 61 which are relatively movable in the axial direction, and a damper 62 incorporated in one of the brace bodies 61. The brace bodies 61, 61 have a tensile force acting between their ends. While the damper 62 generates a damping force when relatively moving with the compression force, the brace body 61 to the viaduct is suppressed while suppressing the sway of the viaduct.
To reduce the resistance from. As the damper 62, there is used a damper such as an oil damper using a viscous fluid that generates a damping force by the relative movement of the damper bodies 61, 61 in the axial direction.

Brackets 63, 63 connected to the ends of the brace body 61 are integrated at both ends of the brace-type damper 6, and the brackets 63, 63 are provided with pins 11 penetrating the gusset plates 8 and 9 themselves. It is rotatably connected to the gusset plates 8 and 9. The brackets 63, 63 are attached to the gusset plates 8, 9 and can also be freely rotated in arbitrary directions by universal joints 8b, 9b described later.

FIG. 1 shows a case where a brace-type damper 6 is erected in the construction plane of the one-layer viaduct in the direction perpendicular to the bridge axis. Here, two brace-type dampers 6 and 6 are installed in an inverted V-shape between the legs of both piers 1 and the middle of beam 2, but the legs of one pier 1 and the other In some cases, one brace-type damper 6 may be installed between the head of the pier 1 and the head.

FIG. 2 shows the legs of one pier 1 and the other pier 1.
The case where two brace-type dampers 6 and 6 are crossed in an X shape between the head and the head is shown.

In FIG. 3, two brace type dampers 6 and 6 are installed in an inverted V shape between the leg portions of both piers 1 and 1 and the middle portion of the beam 2 on the upper layer side of the two-layer viaduct, and the lower layer is constructed. When a concrete block 7 is built on the footing 5 on the side, and two brace type dampers 6, 6 are erected in a V shape between the middle part of the concrete block 7 and the heads of both piers 1, 1. Show. When the viaduct has two layers, the brace-type damper 6, only on the upper layer side or the lower layer side of the two layers 6,
6 may be installed.

In both cases of one layer and two layers, one end of the brace type damper 6 is connected to a leg portion of the pier 1 or a gusset plate 8 projecting from the head portion within the construction plane in the direction perpendicular to the bridge axis. The other end is connected to a gusset plate 8 protruding from the head of the pier 1, or an intermediate portion of the beam 2, or a gusset plate 9 protruding from the footing 5. The gusset plates 8 and 9 face the inner peripheral side of the frame composed of the piers 1 and 1 and the beam 2, and project on the respective surfaces. The same applies to the case where the brace-type damper 6 is installed in the construction plane in the bridge axis direction.

When the brace type damper 6 is installed between the leg portion of one of the adjacent piers 1 and the head portion of the other pier 1 as shown in FIG. 1,1
The gusset plates 8 and 8 are provided only on the upper portion of the beam 2, and the gusset plate 9 is not provided on the beam 2.

FIG. 4 shows a pier 1, which constitutes a framing surface in the axial direction of the bridge.
In the frame consisting of 1 and girder 3, as in FIG. 1, two brace type dampers 6 and 6 are installed between the leg parts of both piers 1 and the middle part of girder 3 in an inverted V shape. Show.

When the brace damper 6 is installed not only in the construction plane in the direction perpendicular to the bridge axis but also in the construction plane in the bridge axis direction,
A band plate to be described later, which is fixed to the legs and the head of the pier 1.
Since the gusset plates 8 and 8 can be protruded in two directions by using 10, the gusset plates 8 and 8 can be attached to the same position of the leg and the head of the pier 1, and a single band plate 10 can be used to make a brace type in two directions. Applicable to installation of dampers 6 and 6.

The gusset plate 8 projecting from the legs and the head of the pier 1 is joined to a band plate 10 surrounding the pier 1 as shown in FIGS.

The band plate 10 is composed of a plurality of plates 10a according to the sectional shape of the pier 1, and the plurality of plates 10a are arranged so as to surround the pier 1, and the plates 10a,
The bridge pier 1 is assembled by welding or bolting the 10a to each other, and for example, as shown in FIG. 11, an epoxy resin or non-shrink mortar is provided between the inner peripheral surface of the band plate 10 and the surface of the bridge pier 1. It is fixed to the pier 1 by being filled with the filling material 10b.

In this case, unevenness is formed on the inner peripheral surface of the band plate 10 so that the vertical force transmitted from the brace type damper 6 is transmitted from the band plate 10 to the pier 1, or a stud bolt or the like. Fixing material is projected.

Plate 10a constituting the band plate 10
Of the plate 10a facing the adjacent pier 1 side,
A gusset plate 8 to which one end of the brace type damper 6 is connected is joined by welding or the like. As shown in FIG. 2, when the brace type dampers 6 and 6 are installed so as to cross each other, the gusset plates 8 and 8 are joined while being displaced from the center of the pier 1.

As shown in FIG. 11, the gusset plate 8 is provided with an insertion hole 8a for connecting the bracket 63 at the end of the brace type damper 6 with the pin 11 or the like. Insertion hole 8a
If necessary, the bracket 63 is allowed to rotate in the out-of-plane direction of the gusset plate 8, and a universal joint 8b is attached so as not to twist the brace type damper 6.

In FIGS. 5 and 6, in order to ensure that the tensile force and the compressive force from the brace type damper 6 are transmitted to the pier 1, a wrapping concrete 12 is provided around the leg of the pier 1. The band plate 10 is constructed and fixed to the root-wrapping concrete 12 while surrounding the root-wrapping concrete 12. 5 and 6 correspond to detailed views of the leg portion of the pier 1 of FIGS. 1 and 2.

The root-wrapping concrete 12 is driven into the footing 5, and is integrated with the footing 5 by the fixing streak 13 protruding from the top end of the footing 5, and the band plate 10 is provided with stud bolts, anchors, etc. projecting on the inner peripheral surface of the band plate 10. It is integrated with the root-wrapping concrete 12 by the fixing material 14.

In this case, the vertical components of the tensile force and the compressive force from the brace type damper 6 are transmitted from the band plate 10 to the footing 5 through the root wrapping concrete 12,
In FIGS. 5 and 6, the horizontal plate 15 is welded below the gusset plate 8 so that the plate 10a to which the gusset plate 8 is welded is not twisted by the compressive force from the brace type damper 6. From footing 5
The compression force is transmitted to.

Below the horizontal plate 15, a vertical plate 16 for stiffening the horizontal plate 15 is combined and welded in a cross shape, for example, and a base plate is welded below the vertical plate 16.
The horizontal plate 15 is fixed to the footing 5 by fixing 17 to the footing 5 by the anchor bolt 18.

In FIGS. 5 and 6, in order to secure the safety against the deformation of the horizontal plate 15, a concrete block 19 is constructed between the opposing band plates 10 on the footing 5 within the width of the horizontal plate 15. The vertical plate 16 is embedded in a concrete block 19.

The gusset plates 9 and 9 protruding from the middle portion of the beam 2 or the middle portion of the beam 3 are arranged on both sides of the beam 2 or the beam 3 as shown in FIGS. , 9 and the beam 2 or the girder 3 are fixed to the beam 2 or the girder 3 with a connecting member 20 such as a PC steel rod or a screw bar that penetrates the girder 3. 7 and 8 correspond to detailed views of the gusset plate 9 portion of the beam 2 and the girder 3 of FIGS. 1, 3, and 4.

In FIGS. 7 and 8, the connecting members 20 penetrating the beam 2 and the girder 3 are arranged in two stages, and the nuts 21 are tightly connected to the side surfaces of the beam 2 and the girder 3 and both surfaces of the gusset plate 9, respectively. The gusset plate 9 is fixed to the beam 2 or the girder 3 with a distance between the gusset plate 3 and the girder 3, but the lower end of the gusset plate 9 is located below the lower end of the beam 2 or the girder 3 as illustrated. In order to restrain the out-of-plane deformation of the gusset plate 9,
Both gusset plates 9, even at the position below the lower end of the girder 3,
9 are connected by the connecting member 20, and the space between them is maintained.

In the case of FIGS. 7 and 8, when the connecting member 20 penetrates the beam 2 or the girder 3 to affect the strength, the brace type damper 6 of the gusset plate 9 is indicated by the chain double-dashed line. A concrete block 22 is constructed around the gusset plate 9 so as to cover the gusset plate 9 and the connecting member 20 except for the connecting portion with. The concrete block 22 has a role of reinforcing the beam 2, the girder 3 and the gusset plate 9 and protecting the connecting member 20.

In the case of FIG. 7 and FIG. 8, since the brace type dampers 6 and 6 are installed on both sides of the beam 2 and the girder 3, the beam 2
Gusset plates 8 and 8 arranged on the legs of the pier 1, facing the gusset plates 9 and 9 fixed to the girder 3
Are joined in parallel to the plate 10a of the band plate 10 fixed to the leg portion of the pier 1.

The gusset plate 9 protruding from the footing 5 is constructed on the footing 5 as shown in FIG. 9, and is joined to the fixing member 23 embedded in the concrete block 7 integrated with the footing 5. . FIG. 9 shows FIG.
Corresponds to a detailed view of the lower end portion of the lower brace-type damper 6 in FIG.

The fixing member 23 only needs to have a shape that does not affect the bar arrangement inside the concrete block 7. For example, a steel material obtained by cutting an H-shaped steel into a required length is used, and if necessary, the brace-type damper 6 The plates 23a are joined to both ends and the central portion of the steel material so that the horizontal component of the axial force from is transmitted to the concrete block 7 as a bearing force. Although not shown, the web of the fixing member 23 is provided with stud bolts or the like for ensuring the integrity with the concrete.

The bracket 63 on the gusset plate 9 side of the brace type damper 6 is also rotatably connected to the gusset plate 9 by itself and the pin 11 penetrating the gusset plate 9. As shown in FIG. 7, the gusset plate 9 has an insertion hole through which the pins 11 and the like penetrate as in the gusset plate 8.
9a is opened, and a universal joint 9b for connecting the bracket 63 rotatably in the out-of-plane direction of the gusset plate 9 is attached to the insertion hole 9a.

FIG. 10 shows a case in which the viaduct has two layers, in which the head portion of the pier 1 on the lower layer side and the middle portion of the footing 5 and the middle portion of the leg portion of the pier 1 on the upper layer side and the beam 2 on the upper layer side. The case where the brace type damper 6 is installed between and, and the band 2 and the girder 3 are sandwiched to form a pair and the band plates 10 and 10 are fixed to the pier 1.

In this case, the diaphragm 2 is provided on the opposite surfaces of the band plate 10 arranged on the head of the lower pier 1 and the band plate 10 arranged on the leg of the upper pier 1.
4 and 24 are joined, and both diaphragms 24 and 24 are connected to each other by a tension member 25 such as a PC steel rod or a screw rebar.

As shown in FIG. 11, which is a detailed view of the band plates 10 and 10 in FIG. 10, the band plate 10 has a filling material 10b between the inner peripheral surface of the band plate 10 and the surface of the pier 1, as described above. Is fixed to the pier 1 by being filled.

The tension member 25 is a band plate which is vertically opposed.
Diaphragm 24, 24 for transmitting tensile force between 10 and 10
The tensile force acting on one of the band plates 10 installed between them is transmitted to the diaphragm 24 joined to the opposing band plate 10 through the tension member 25. From the diaphragm 24, the beam 2 and the girder 3 are further transmitted. The diaphragm 24 receives the tensile force from the tension member 25 because it is transmitted as a supporting pressure.
And the size that can be transmitted to the girder 3.

The compressive force acting on one band plate 10 is the diaphragm bonded to that band plate 10.
It is transmitted from 24 to beam 2 and girder 3 directly as bearing pressure.

The tension member 25 is a diaphragm as shown in FIG.
Although they are evenly arranged in the circumferential direction such as the four corners of 24, but there is no beam 2 on the opposite side of the beam 2 with the pier 1 in between, the diaphragm is generated by the tensile force and the compressive force acting on one of the band plates 10. Since the part of beam 24 where beam 2 is absent may be deformed, diaphragm 24, 24 is shown in the drawing where beam 2 is absent.
A spacing member 26 such as an H-shaped steel, which bears a compressive force between the diaphragms 24 and 24, is arranged between the diaphragms 24 and 24 by bolts 27.

[0060]

EFFECTS OF THE INVENTION A gusset plate is projected at at least two positions facing each other in the inclined direction in any of the leg portion of the pier, the head portion of the pier, the middle portion of the beam, the middle portion of the girder, or the like. By installing a brace-type damper that incorporates a damper in the brace body between the opposing gusset plates, the existing reinforced concrete viaduct is reinforced by seismic resistance, while the built-in damper blocks traffic vibrations. Only by installing a brace-type damper, it is possible to simultaneously solve the seismic reinforcement of the viaduct and the suppression of vibration.

Further, since the gusset plate to which the brace-type damper is connected is projected at the leg or footing of the pier with the joint removed and the head of the pier, or the middle of the beam or girder, the bar arrangement at the joint is arranged. A decrease in proof stress of the joint due to the influence on

According to the third aspect, the band plate fixed to the pier so as to surround the pier is joined to the gusset plate protruding from the leg portion or the head of the pier, so that the existing pier is not damaged. In addition, the axial force from the brace type damper can be dispersed and transmitted to the bridge piers, and the concrete restraining effect can increase the yield strength of concrete.

According to the present invention, since the band plate is integrated with the root wrapping concrete in a state of surrounding the root wrapping concrete constructed around the pier legs, the axial force from the brace type damper is applied through the root wrapping concrete to the bridge pier. Can be reliably transmitted.

According to the present invention, the head portions of the lower piers and the band plates arranged on the upper pier legs are connected to each other by connecting the diaphragms joined to the respective facing surfaces with tension members. Therefore, the vertical component of the tensile force from the brace type damper can be transmitted to the pier, the beam, and the girder through the tensile member and the diaphragm.

According to the sixth aspect of the present invention, the gusset plates projecting from the middle portion of the beam or girder are arranged on both sides of the beam or girder, and the gusset plate and the beam or girder are fixed to the beam or girder by a connecting member penetrating the girder or girder. The axial force from the brace type damper can be transmitted to the beam or girder through the gusset plate and the connecting member.

According to a seventh aspect of the present invention, since the gusset plate is covered with concrete together with the connecting material except for the connecting portion of the gusset plate with the brace type damper, the proof stress of the beam or girder is reduced even though the through holes are formed in the beam or girder. Can be avoided,
It is possible to improve the seismic performance without damaging the seismic performance of the existing viaduct.

According to the eighth aspect of the present invention, the gusset plate protruding from the footing is joined to the fixing member which is built on the footing and is embedded in the concrete block integrated with the footing. Therefore, the axial force from the brace damper is applied to the concrete. It can be transmitted to footings through blocks.

[Brief description of drawings]

FIG. 1 is an elevational view showing a state in which a brace-type damper is installed in an inverted V shape in a construction plane in a direction orthogonal to a bridge axis.

FIG. 2 is an elevational view showing a state in which a brace-type damper is installed in an X shape in a construction plane in a direction perpendicular to the bridge axis.

FIG. 3 is an elevational view showing an installation example of a brace-type damper in the case where the viaduct has two layers.

FIG. 4 is an elevational view showing a state in which a brace-type damper is installed in a construction plane in the bridge axis direction.

FIG. 5 is an elevational view showing an example of fixing a band plate to a leg portion of a pier.

FIG. 6 is a plan view of FIG.

FIG. 7 is a cross-sectional view showing an example of fixing a gusset plate to a beam.

FIG. 8 is a view taken along the line xx of FIG.

FIG. 9 is an elevation view showing an example of fixing the gusset plate to the footing.

FIG. 10 is an elevational view showing an example of connection of band plates arranged in pairs to the head and legs of the pier.

FIG. 11 is an elevational view showing details of the band plate portion of FIG.

FIG. 12 is a plan view of FIG. 11.

[Explanation of symbols]

1 ... Bridge pier, 2 ... Beam, 3 ... Girder, 4 ... Slab, 5 ...
… Footing, 6 …… Brace type damper, 61 …… Brace body, 62 …… Damper, 63 …… Bracket, 7 ……
Concrete block, 8 ... Gusset plate, 8a ...
… Insertion hole, 8b… Universal joint, 9… Gusset plate,
9a …… insertion hole, 9b …… universal joint, 10 …… band plate, 10a …… plate, 10b …… filling material, 11 …… pin,
12 …… Negaki concrete, 13 …… Anchorage, 14 …… Anchoring material, 15 …… Horizontal plate, 16 …… Vertical plate, 17 ……
Base plate, 18 …… Anchor bolt, 19 …… Concrete block, 20 …… Connecting material, 21 …… Nut, 22 ……
Concrete block, 23 …… Fixing member, 23a …… Plate, 24 …… Diaphragm, 25 …… Tensile material, 26 …… Spacing material, 27 …… Bolt.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tsuneo Hasuda             38-8, Hikarimachi, Kokubunji, Tokyo 38 Foundation             Corporate Railway Technical Research Institute (72) Inventor Kojiro Fujii             38-8, Hikarimachi, Kokubunji, Tokyo 38 Foundation             Corporate Railway Technical Research Institute (72) Inventor Yasushi Takei             38-8, Hikarimachi, Kokubunji, Tokyo 38 Foundation             Corporate Railway Technical Research Institute (72) Inventor Koji Oka             1-13-1 Yamashita, Okayama City, Okayama Stock             Company Omotogumi (72) Inventor Shoji Uehara             1-13-1 Yamashita, Okayama City, Okayama Stock             Company Omotogumi (72) Inventor Hidekuni Hyokawa             1-13-1 Yamashita, Okayama City, Okayama Stock             Company Omotogumi (72) Inventor Kazumi Yamamoto             4-38-13 Honmachi, Nakano-ku, Tokyo Stock market             Company structure planning laboratory (72) Inventor Osamu Takahashi             4-38-13 Honmachi, Nakano-ku, Tokyo Stock market             Company structure planning laboratory F-term (reference) 2D059 BB37 BB39 GG13 GG40

Claims (8)

[Claims] 1. A bridge pier which is arranged in a direction perpendicular to the bridge axis and is arranged at intervals in the bridge axis direction, a beam which connects the bridge piers which are arranged in a direction perpendicular to the bridge axis, and a bridge pier which is adjacent to the bridge axis direction are connected. In existing reinforced concrete viaducts composed of girders, at least two points facing each other in the inclined direction, in either the pier legs, the pier head, the middle of the beam, or the middle of the girder. A seismic reinforcement method for existing reinforced concrete viaducts in which gusset plates are projected, brace-type dampers with dampers built into the brace body are installed between opposing gusset plates, and both ends are connected to the gusset plates. 2. The bridge piers that are arranged in the direction perpendicular to the bridge axis and are arranged at intervals in the bridge axis direction, the beams that connect the bridge piers that are arranged in the direction perpendicular to the bridge axis, and the bridge piers that are adjacent in the bridge axis direction are connected. In existing reinforced concrete viaducts composed of girders and footings that connect the foundations of adjacent piers, the pier legs, pier heads, footings, beam midsections, or girder midsections A gusset plate is projected at at least two locations facing each other in the inclined direction, and a brace-type damper incorporating a damper in the brace body is installed between the opposing gusset plates, and both ends of the gusset plate are attached to the gusset plate. Seismic retrofitting method for existing reinforced concrete viaducts to be connected. 3. The existing reinforced concrete construction according to claim 1 or 2, wherein a gusset plate arranged on a leg portion or a head portion of the pier is joined to a band plate fixed to the pier so as to surround the pier. Seismic reinforcement method for viaducts. 4. The existing reinforced concrete construction according to claim 3, wherein the band plate arranged on the leg portion of the pier is integrated with the root wrap concrete in a state of surrounding the root wrap concrete constructed around the leg portion of the pier. Seismic reinforcement method for viaducts. 5. The existing reinforced concrete viaduct has two layers, and the band plate arranged on the head of the lower pier and the band plate arranged on the pier of the upper pier face each other. The method for seismic reinforcement of an existing reinforced concrete viaduct according to claim 3, wherein the diaphragms joined to each other are connected with each other by connecting them with a tensile member. 6. Arrangement of gusset plates protruding from the middle part of the beam or the middle part of the girder on both sides of the girder or girder,
The seismic strengthening method for an existing reinforced concrete viaduct according to claim 1 or 2, wherein the gusset plate and the beam, or the beam or girder is fixed to the beam or the girder with a connecting material penetrating the girder. 7. The seismic retrofitting method for an existing reinforced concrete viaduct according to claim 6, wherein the gusset plate is covered with concrete together with the connecting material, except for the connecting portion of the gusset plate with the brace type damper. 8. The existing reinforced concrete construction according to claim 1 or 2, wherein a gusset plate arranged on the footing is joined to a fixing member which is built on the footing and is embedded in a concrete block integrated with the footing. Seismic reinforcement method for viaducts.