KR101628086B1 - seismic performance device for bridge and seismic performance method by using seismic performance device - Google Patents

Abstract

The present invention relates to a seismic performance device for a bridge and a seismic performance method using the same, to limit movements in a longitudinal direction and in a perpendicular direction thereof for the bridge without a bridge bearing, to prevent fall of a bridge upper board. The seismic performance device comprises: an upper bracket including a projection formed on a slab; a lower bracket installed on a bridge pier and including a settling portion for the projection to limit movements of the projection of the upper bracket; and an impact damping member provided between the upper and lower brackets. According to the present invention, the movement of the bridge upper board by a seismic load is limited both in a longitudinal direction and a perpendicular direction, and impact loads and damages to each bracket are reduced by introducing the impact damping member allowing normal displacement. The impact damping member can provide a constant damping effect without being deformed in a harsh environment thanks to the materials thereof and a steel plate formed therein.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic reinforcing device for a bridge,

The present invention relates to an existing seismic retrofitting apparatus for preventing a bridge of a bridge top plate caused by an earthquake by restricting the behavior of existing bridges in a direction perpendicular to the throttling direction and the throttle axis.

In general, bridges are bridges that allow people and vehicles (including railroad cars) to cross rivers, valleys, depressed land, streams and rivers such as traffic roads and waterways.

These bridges are basically made up of bridges, bridges for supporting them, and bridge piers. Depending on the kind of materials used, they are divided into steel bridges, concrete bridges, wooden bridge bridges and bridges. Depending on the usage, It is classified as Sangyo Bridge, Middle Bridge, Halo Bridge, and 2-story bridge depending on the location of the surface, and it is classified into girder bridge, arch bridge, trust bridge, slab bridge, ramen bridge, cable-stayed bridge, .

Meanwhile, since the bridge having the above-described structure has a structure in which the bridge top plate is placed on the bridge pier and the alternating bridge, various attempts have been made to prevent the falling bridge of the bridge top plate.

As an example, the arch bridge proposed in Korean Registered Patent No. 10-0402954, Korean Registered Utility No. 20-0425703, and Korean Registered Patent No. 10-1008606 forms a bracket on a bridge top plate and a quadrature apparatus installed on the bridge, It is designed to prevent the bridge top plate from slipping in the direction perpendicular to the throat axis.

(Patent Document 1) KR10-0402954 B1 Quasistar apparatus and method for preventing lifting and falling of bridge beam

(Patent Document 2) KR20-425703 Upper Structure of Y1 Bridge

(Patent Document 3) KR10-1008606 B1 Method for preventing falling of bridge beam and its structure

In the meantime, most of the above-mentioned prior arts have a structure in which a bracket is installed in a coordinate system formed between a bridge top plate and a bridge pier.

The bridges to which the above-described brackets are applied are structured so as to prevent falling down of the bridge top plate by various methods. Particularly, since the bridges are provided with a bridge device and a telescopic joint device installed on the bridge top plate, There will not be an abutment of the top plate.

However, most of the old bridges built before the interrogation device are made of bridges, bridges, and alternations only.

These older bridges are older than 30 years, but they are still used without any indication of abnormal behavior.

Especially, in the case of old bridges, it is difficult to secure economical and safety to construct a new bridge system due to the deterioration of existing sphere in consideration of the aging of bridges.

Meanwhile, although the above-mentioned old bridges have been used without any difficulty, there has been a problem that bridge collapse occurs due to the occurrence of an overhang of the bridge top plate during an earthquake.

That is, although the above-described prior art techniques can apply various seismic reinforcement as a technique applied to bridges in which a quasi-system is installed, there is a problem that can not be applied to old bridges.

In order to solve the above problems, the existing seismic retrofitting apparatus of the present invention and the seismic retrofitting method using the existing seismic retrofitting method of the present invention restrict the behaviors of the bridge top plate in which the seismic system is not installed, And an object of the present invention is to provide an earthquake-proof reinforcement method using the same.

It is a further object of the present invention to provide a cushioning member capable of restricting direct contact of a steel portion of upper and lower brackets during a seismic reinforcement of a bridge in which a tilting apparatus is not installed, So as to improve the strength of endurance against the buffering action.

It is still another object of the present invention to provide a function to prevent deformation of a buffer member even in a temperature change, a climate change, and a fire, thereby preventing the deformation strength of the buffer material from deteriorating.

The present invention can provide seismic strengthening by restricting not only the behavior in the direction perpendicular to the sagittal axis but also the direction in the sagittal axis because the bridge device is not installed and is installed at a position where the bridge bridge is expected.

It is also possible to provide a cushioning member between the upper bracket installed on the slab and the lower bracket installed on the bridge to allow the cushioning member to constantly deform during the behavior of the bridge and reduce the breakage and impact load of the upper and lower brackets during the earthquake .

The cushioning member containing the functional additive can improve weather resistance, water resistance, heat resistance, ozone resistance and flame retardancy, and can prevent degradation of the strength of endurance against deformation of the cushioning material.

In addition, it is a useful invention that an iron plate is formed in the inside of the buffer member to prevent damages and deformation of the buffer material while allowing smooth buffering action.

1 is a state diagram showing an installed state of the present invention;
Fig. 2 is a side view of Fig. 1; Fig.
3 is a perspective view showing an existing seismic retrofitting apparatus according to the present invention.
Fig. 4 is a perspective view of Fig. 3 taken at different angles. Fig.
5 is an enlarged view of part A of Fig.
6 is an enlarged view of a portion B in Fig.

The seismic retrofitting apparatus 50 according to the present invention is installed in an existing bridge 1 not provided with a coordinate system to limit the behavior of the bridge upper plate in the direction of the throttling axis and the direction perpendicular to the throttling axis, .

1 and 2, the present invention comprises an upper bracket 10 coupled to the slab 1a of the bridge 1 and a lower bracket 30 coupled to the bridge 1b of the bridge 1, A buffer member 20 is formed between the upper bracket 10 and the lower bracket 30 so as to provide a buffering effect when the bridge top plate is moved. .

Hereinafter, the configuration of the seismic strengthening apparatus 50 according to the present invention will be described in more detail.

1. Seismic Retrofit

3 to 6, the upper bracket 10 is configured to be coupled to the slab 1a formed on the lower side of the bridge top plate of the existing bridge 1. More specifically, And an upper bracket watertight plate 11 coupled to the slab 1a at a formed position.

The upper bracket water level plate 11 is in the form of a plate and is horizontally coupled to the slab 1a and a plurality of anchor bolt holes h are formed inside the upper bracket horizontal plate 11 to connect the anchor a, And the nut (N).

In addition, the latching protrusion 12 is formed to protrude downward as a structure to be coupled to the lower portion of the upper bracket watertight plate 11. [

The engaging protrusion 12 should be firmly coupled with the upper bracket watertight plate 11 for restricting the movement of the bridge upper plate in the throttle direction.

In the drawings of the present application, the above-described latching protrusion 12 is shown in a rectangular parallelepiped shape, but the latching protrusion 12 may be formed in various shapes such as a polygonal shape or a circular shape.

The cushioning member 20 has left and right side surface cushioning materials 21 and 22, a back surface cushioning material 23 and a bottom cushioning material 23 which are joined to the left and right side surfaces, the rear surface and the bottom surface of the latching projection 12 of the upper bracket 10 24).

Although the respective cushioning materials 21, 22, 23, and 24 are illustrated as being coupled to each other in the drawings, the cushioning materials may be separated from each other.

The cushioning member 20 may be used by engaging with the hooking protrusion 12 of the upper bracket 10 at the time of initial construction.

In particular, an iron plate s may be formed in each of the buffering members 21, 22, 23, and 24 of the buffer member 20 so as to maintain shape deformation and elastic force when an external force is generated. (21, 22, 23, 24) are shown in a plate-like shape in the drawing, but the present invention is not limited thereto and can be manufactured in accordance with the shape of the latching protrusion (12).

The cushioning member 20 is made of a rubber composition containing 55 to 62% by weight of chloroprene rubber, 20 to 25% by weight of carbon black, 4 to 5% by weight of compounded oil, 4 to 5% by weight of lead oxide, 1 to 2% by weight of 2'-methylenebis (6-tert-butyl-4-methylphenol), 1 to 1.4% by weight of N- (1,3-Dimethylbutyl) -N'phenyl-phenylene diamine, 0.1 to 0.5% by weight of sulfur, 0.1 to 0.5% by weight of calcium, 2 to 4% by weight of calcium carbonate, 1 to 4% by weight of phenol (Styrenated Phenol), Polymer of 2,2,4-trimethly-1,2- dihydroquinoline 0.1 to 0.3% by weight of a vulcanizing agent, and 1 to 3% by weight of a phosphorus-containing flame retardant.

Herein, the chloroprene rubber is a homopolymer having mostly a complete trans-1,4 structure and thus has very high structural regularity, so that crystallization by stretching is possible. Such a chloroprene rubber as a base material for imparting an elastic force to a cushioning material can not impart an elastic force when the cushioning material is below a critical value. When the cushioning material exceeds a critical value, the curing does not cause a significant change in physical properties during vulcanization.

Carbon black is included as a filler in order to increase tensile strength and hardness and to improve moldability. If the carbon black is below a threshold value, the above-mentioned effect can not be expected, and if it exceeds the threshold value, the moldability is deteriorated.

Next, when the compounding oil is added as an additive for improving moldability by forming the flexibility and elasticity of the chloroprene rubber as a plasticizer, the above-mentioned effect can not be expected, and if it exceeds the critical value, the flowability is increased, There is a problem that it is deteriorated.

Next, the metal oxide, lead oxide, is used for the vulcanization or neutralization of the hydrogen fluoride which is produced when the vulcanized product is used at a high temperature. Generally, the most used oxides are magnesium oxide and zinc oxide. However, it is inefficient when optimum water resistance, steam resistance, and acid resistance are required, and the present invention is used to improve water resistance.

Next, BPH (2,2'-methylenebis (6-tert-butyl-4-methyl-phenol) is a phenol group having a three-dimensional structure of an alkylate bisphenol, which is very effective for vulcanization hardening and has excellent ozone resistance and cracking . ≪ / RTI >

Next, N- (1,3-Dimethylbutyl) -N'phenyl-phenylene diamine is effective in resistance to bending, oxidation, ozone cracking, and freezing and thawing pants. Particularly, it has an excellent effect in preventing oxidation, frost, and cracking due to ozone.

Next, styrene-butadiene phenol is a non-staining, non-staining antioxidant which is excellent in heat resistance and bending resistance and is not affected by a vulcanization accelerator and is less deformed.

Secondly, Polymer of 2,2,4 - trimethly - 1, 2 - dihydroquinoline, which is a vulcanization accelerator, is excellent in preventing aging by heat and has no blooming phenomenon in which the compounding agent seeps onto the rubber surface during compounding, The vulcanization accelerating force is formed in the rubber.

Next, sulfur is used as a curing agent for vulcanization of chloroprene rubber.

Next, calcium carbonate is used as the auxiliary filler.

Next, the vulcanizing agent is used as a vulcanizing agent for vulcanization of the chloroprene rubber.

Next, a phosphorus-based flame retardant, which is an inorganic flame retardant, is used for imparting flame retardancy to safety in a fire, and unlike an organic flame retardant, it is not volatilized by heat.

The cushioning member 20 having the above-described structure can prevent the deformation of the cushioning member 20 due to the compressive force by inserting an iron plate s between a plurality of rubber layers at the time of manufacture and vulcanizing the cushioning member 20. Particularly, Water resistance, heat resistance, ozone resistance and flame retardancy.

Next, the lower bracket 30 is constituted by a lower bracket perpendicular plate 31 which is fixedly coupled to the side of the bridge 1b of the bridge 1.

The lower bracket 40 is formed in a plate shape and is vertically coupled to the bridge pier 1b and a plurality of anchor bolt holes h are formed in the inner side to form an anchor a coupled to the bridge pier 1b. And the nut (N).

In addition, the first and second vertical plates 32 and 33 extend in the vertical direction and extend in the throttling direction on the lower bracket vertical plate 31.

The first and second vertical plates 32 and 33 are spaced apart from each other by a predetermined distance. More preferably, the first and second vertical plates 32 and 33 are located on the left and right sides of the latching protrusion 12 of the upper bracket 10, And the protruding distance is formed to be as large as the protruding distance extends in the direction of the throttle of the latching protrusion 12. [

That is, the first and second vertical plates 32 and 33 may be formed to have the same length as the length of the upper bracket 10 in the direction perpendicular to the throttling axis and the length in the throttling direction.

A first horizontal plate 34 is formed between the first and second vertical plates 32 and 33 to support the lower surface of the latching protrusion 12 of the upper bracket 10.

The upper and lower horizontal brackets 32 and 33 and the first horizontal plate 34 engage with each other so that the latching protrusions 12 of the upper bracket 10 can be seated on the lower bracket 30 of the present invention The protrusion seating space 35 is constituted.

Although the first and second vertical plates 32 and 33 are shown in the form of plates, the first and second vertical plates 32 and 33 may have the same shape as the latching protrusion 12 of the upper bracket 10.

A third vertical plate 36 is formed on a side of the first vertical plate 32 at a predetermined distance in parallel with the first vertical plate 32, A fourth vertical plate 37 is formed on a side of the second vertical plate 33 at a predetermined distance in parallel with the second vertical plate 33 and the first and third vertical plates 32 and 36, A plurality of reinforced water level plates 38 are formed in the vertical direction between the straight plates 33 and 37 to support the first and second vertical plates 32 and 33 when the bridge top plate is moved in the direction perpendicular to the throttling axis .

The bolt seat groove 38a may be further formed in the reinforcing water level plate 38 disposed on the uppermost one of the reinforcing water level plates 38 of the lower bracket 30 of the present invention.

That is, since the upper bracket 10 and the lower bracket 30 are in contact with each other, the anchor a and the nut N used when fixing the upper bracket 10 to the slab 1a are fixed to the lower bracket 30 may interfere with the reinforcing water level plate 38.

Therefore, in the present invention, the bolt seat groove 38a may be formed in the reinforcing water flat plate 38 at a position where interference may occur to prevent interference.

Particularly, although the bolt seat groove 38a should be accurately formed at a position that does not interfere with the anchor (a) of the upper bracket 10, errors may occur due to errors in the processing of each bracket and irregularly formed surfaces It is preferable to form it into a long hole shape to solve this problem.

2. Seismic retrofitting of existing bridges

The present invention can be carried out as an upper bracket fixing step, a cushioning member joining step, and a lower bracket fixing step in order to perform seismic retrofitting of existing bridges by using the above-described seismic retrofitting apparatus 50 of existing bridges. Examples are as follows.

end. The buffer member joining step

In this step, the left surface cushioning material 21, the right surface cushioning material 22, the back surface cushioning material 23, the bottom cushioning material 24, and the bottom surface cushioning material 24 are provided on the left and right sides, the rear surface and the bottom surface of the latching projection 12 of the upper bracket 10, .

This step may be performed before fixing the upper bracket 10 to the slab 1a, or may be performed after the upper bracket 10 is installed, or after the lower bracket fixing step.

Particularly, in the case of the back surface buffer material 23 constituting the buffer member 20, the upper bracket 10 should be attached before the upper bracket 10 is fixed to the slab 1a, will be.

When the left and right side surface cushioning materials 21 and 22 and the bottom surface cushioning material 24 are joined together after the upper bracket 10 is fixed, the rear surface cushioning material 24 is bonded together And when it is installed after fixing the lower bracket 30, it can be coupled through fitting.

I. Upper bracket fixing step

This step is a step for fixing the upper bracket 10 to the slab 1a constituting the bridge 1.

In this step, the fixing position of the upper bracket 10 can be completed by connecting the upper bracket 10 to the upper slab 1a on which the bridge pier 1b is formed.

That is, the position where the upper bracket 10 is to be installed is selected and the anchor bolt seat (not shown) is positioned so that the anchor bolt (a) can be engaged with a plurality of anchor bolt holes h formed in the upper bracket- The anchor holes h1 are formed in the slab 1a using the perforation means and the anchor bolts a are inserted into the anchor holes h1 thus formed.

Thereafter, the anchor bolt holes h of the upper bracket plate 11 of the upper bracket 10 are aligned with the anchor bolts a formed on the slab 1a, and then the fastening is completed using the nuts N .

In this work, the upper bracket 10 is fixed with a structure symmetrical to both sides with reference to the bridge top plate, and the bridge bracket 10 is continuously carried out in a direction perpendicular to the throat (vehicle running direction).

All. Lower bracket fixing step

This step is a step for fixing the lower bracket 30 to the bridge pier 1b of the bridge 1.

Particularly, in this step, the lower bracket 30 is positioned at a position where the latching protrusion 12 of the upper bracket 10 can be seated in the latching protrusion seating space 35 of the lower bracket 30, The anchor bolt hole a formed on the lower bracket perpendicular plate 31 of the lower bracket 30 is disposed in alignment with the anchor bolt a after the anchor bolt a is installed on the bridge pillar 1b, (N) can be tightened.

The seismic retrofitting apparatus 50 of the existing bridge having the installation as described above performs the function of supporting the bridge upper plate when it behaves in the direction of the throttling axis or the perpendicular direction of the throttling to prevent the falling of the bridge top plate, I will be able to improve my progressive strength.

That is, the upper bracket 10 of the present invention is fixedly coupled to the slab 1a, and the lower bracket 30 is fixedly coupled to the bridge pier 1b.

Particularly, the upper bracket 10 and the lower bracket 30 are not fixedly coupled to each other, but the latching projection 12 of the upper bracket 10 is seated in the latching projection seating space 35 of the lower bracket 30 State.

In this state, when the bridge upper plate is moved in a direction perpendicular to the running direction of the vehicle, the slabs 1a and the upper brackets 10 coupled to the slabs 1a move together.

Any one of the first and second vertical plates 32 and 33 of the lower bracket 30 coupled to the pier 1b and one of the left and right sides of the latching projection 12 of the upper bracket 10 It is possible to prevent the bridge top plate from moving in the vehicle running direction as the side surfaces come into contact with each other.

Particularly, since the first and second vertical plates 32 and 33 are supported by the third and fourth vertical plates 36 and 37 and the plurality of reinforcing water level plates 38, By limiting I will be able to improve my progressive strength.

When the bridge upper plate is moved in the vehicle running direction, the rear surface of the latching protrusion 12 formed on one of the upper brackets 10 formed on both sides of the bridge 1 is connected to the lower bracket 10 10 so as to limit the behavior of the bridge top plate.

The upper bracket 10 and the lower bracket 30 can be manufactured by standardizing the lower weight according to the size of the bridge 1.

Meanwhile, in the present invention, the cushioning member 20 is formed between the upper bracket 10 and the lower bracket 30 to prevent breakage of each bracket made of a steel material while allowing a constant amount of deformation, In addition, by increasing the buffering force, it is possible to reduce the amount of impact according to the behavior of the bridge top plate, thereby improving the strength of endurance.

Particularly, the cushioning member 20 described above is excellent in weather resistance, water resistance, heat resistance and ozone resistance, and is not deformed by the external environment even if it is provided on the outside. Particularly, since the flame retardant is not volatilized by heat using an inorganic flame retardant, It is possible to obtain an effect that it is not easily deformed even in an environment.

In the present invention, the cushioning members 20, 21, 22, 23, 24 may be provided with one or more steel plates s So that the elasticity can be prevented from being lowered due to the shape change and the breakage, so that the effect of continuously buffering the elasticity can be obtained.

While the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will readily observe that various changes and modifications within the spirit and scope of the invention should be made without departing from the scope of the invention as defined by the appended claims. .

1: Bridge 1a: Slab 1b: Pier
10: Upper bracket
11: upper bracket water level plate 12: latching protrusion h: anchor bolt hole
20: buffer member
21: left surface cushioning material 22: right surface cushioning material 23:
24: Bottom cushion material s: Steel plate
30: Lower bracket
31: lower bracket vertical plate 32: first vertical plate 33: second vertical plate
34: first horizontal plate 35: latching protrusion seating space 36: third vertical plate
37: fourth straight plate h: anchor bolt hole
38: Reinforced water level plate 38a: Bolt seat groove
50: Seismic retrofit of existing bridges

Claims (6)

An upper bracket watertight plate 11 having a flat plate shape so as to abut against the slab 1a of the bridge 1 in a horizontal direction and having a plurality of anchor bolt holes h in the inside thereof, An upper bracket 10 coupled to a lower portion of the horizontal plate 11 and including a latching protrusion 12 protruding downward;
The upper bracket 10 is attached to both sides and the back and bottom surfaces of the engaging projection 12 of the upper bracket 10 and includes 55 to 62 wt% of chloroprene rubber, 20 to 25 wt% of carbon black, 4 to 5 wt% 4 to 5% by weight of lead oxide, 1 to 2% by weight of BPH (2,2'-methylenebis (6-tert-butyl-4-methylphenol), N- (1,3-Dimethylbutyl) 1 to 1.4% by weight of - phenylene diamine, 1 - 1.4% by weight of styrenated phenol, 0.1 - 0.5% by weight of Polymer of 2,2,4 - trimethly - 1,2 - dihydroquinoline (vulcanization accelerator) A plurality of cushioning materials 21, 22, 23 and 24 each consisting of 0.1 to 0.5 wt% of sulfur, 2 to 4 wt% of calcium carbonate, 0.1 to 0.3 wt% of a vulcanizing agent and 1 to 3 wt% (20) consisting of at least one steel plate (s) in the inside of the inner shells (21, 22, 23, 24);
A lower bracket perpendicular plate 31 having a flat plate shape to abut against and pivot in a perpendicular direction to the bridge pier 1b of the bridge 1 and having a plurality of anchor bolt holes h in the inside thereof, The first and second brackets 20 and 20 are coupled to the first bracket 10 and extend in the vertical direction and extend in the direction of the axis of the first bracket 10 and are spaced apart from each other to allow the latching protrusion 12 of the upper bracket 10, The upper bracket 10 is coupled to the lower bracket 40 and extends in the horizontal direction so as to extend in the direction of the axis of the upper bracket 10, The first and second vertical plates 32 and 33 and the first vertical plate 34 engage with the engaging protrusions 12 of the upper bracket 10, And the first vertical plate 32 and the first vertical plate 32 are spaced apart from each other, A fourth vertical plate 37 formed parallel to the second vertical plate 33 and spaced apart from the second vertical plate 33, A plurality of reinforcing water level plates (not shown) formed between the first and second water leveling plates 32 and 36 and the second and fourth water leveling plates 33 and 37, And a lower bracket 30 formed of a bolt seat groove 38a in the uppermost reinforcing water level plate 38 abutting the upper bracket 10 among the plurality of reinforcing water level plates 38. [ Seismic retrofit of existing bridges.
delete delete And an upper bracket horizontal plate having a plurality of anchor bolt holes formed in a flat plate shape so as to abut against the slab of the bridge at the upper side and a plurality of anchor bolt holes formed at the lower side of the upper bracket horizontal plate, An upper bracket including a projection;
Wherein the upper and lower brackets are joined to both side surfaces and a rear surface and a bottom surface of the latching protrusion of the upper bracket, wherein 55-62 wt% of chloroprene rubber, 20-25 wt% of carbon black, 4-5 wt% 5% by weight, 1 to 2% by weight of BPH (2,2'-methylenebis (6-tert-butyl-4-methylphenol) 0.1 to 0.5 wt.% Of sulfur, 0.1 to 0.5 wt.% Of sulfur, 1 to 1.4 wt.% Of styrenated phenol, 1 to 1.4 wt.% Of styrenated phenol, Polymer of 2,2,4-trimethly-1,2- dihydroquinoline , 2 to 4% by weight of calcium carbonate, 0.1 to 0.3% by weight of a vulcanizing agent, and 1 to 3% by weight of a phosphorus-based flame retardant agent, and a cushioning member composed of at least one steel plate in the plurality of cushioning materials;
A lower bracket perpendicular plate including a plurality of anchor bolt holes formed in a flat plate shape so as to abut against a pier of a bridge, and an anchor bolt hole extending from the lower bracket perpendicular plate, The first and second vertical plates are spaced apart from each other so that the latching protrusions of the upper bracket coupled to the lower bracket can be inserted. A first horizontal plate formed to support the lower surface of the latching protrusion of the upper bracket; a latching protrusion seating space formed to allow the latching protrusion of the upper bracket to be seated by the first and second vertical plates and the first horizontal plate; A third vertical plate spaced from the first vertical plate and formed in parallel with the first vertical plate, and a second vertical plate spaced apart from the second vertical plate and parallel to the second vertical plate A plurality of reinforcing water level plates formed between the first and third water leveling plates and the second and fourth water leveling plates so as to counteract the horizontal forces generated by the first and second water leveling plates, And a lower bracket having a bolt seat groove on an uppermost reinforcing water level plate abutting the upper bracket among the plurality of reinforcing water level plates. In the seismic retrofitting method,
Attaching a plurality of cushioning materials to the left, right, bottom, and back surfaces of the latching protrusions formed on the upper bracket;
An upper bracket fixing step of fixing an upper bracket to a slab at a position where a pier is formed in the bridge through an anchor bolt hole formed in the upper bracket water level plate of the upper bracket;
And a lower bracket securing step for securing and coupling the lower bracket through an anchor bolt hole formed in the lower bracket vertical plate of the lower bracket after the engaging protrusion of the upper bracket is disposed in the engaging protrusion seating space of the lower bracket on the side of the pier of the bridge Seismic Retrofit Method Using Seismic Retrofit of Existing Bridge. delete delete

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