KR102046406B1 - Vibration-reducing girder - Google Patents

Abstract

The present invention relates to a vibration reduction type girder, which absorbs and reduces vibration of a deck and supports a load applied from the deck by being installed on the lower side of the deck in a bridge. The vibration reduction type girder includes: a girder installed in a pier or an abutment; a lower member installed on the upper surface of the girder; an upper member installed on the bottom of the upper plate to correspond to the lower member; an elastic member installed between the lower member and the upper member and relieving shock and vibration by absorbing the shock and the vibration transferred from the deck; and an elasticity control unit installed between the elastic member and the upper member and controlling elasticity of the elastic member. According to the present invention, the vibration reduction type girder can elastically support the load applied from the deck due to a movement of a vehicle, by controlling the elasticity of the elastic member installed between the lower member and the upper member. Therefore, the vibration reduction type girder can remarkably reduce a live load, an impulsive load, and a vibration load due to the movement of the vehicle.

Description

Vibration-Reducing Girder {Vibration-reducing girder}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration reducing girder, and more particularly, to a vibration reducing girder which is installed under a bridge upper plate to support a load applied from the upper plate and can absorb and reduce vibration of the upper plate.

In general, bridges are road structures that cross rivers or rivers, or driveways or railroads, and are constructed by various construction methods depending on the environment, characteristics, and uses to be installed.

In addition, the bridge is a superstructure constituting the roadway, railroad, sidewalk, etc. is placed on the bridge or alternating bridge, and a bridge device for transmitting the load by the superstructure to the bridge or alternating bridge is installed between the superstructure and the bridge or shift. .

Although the main function is to bridge or alternately transfer the load of the upper structure, the bridge device also includes a function that can effectively reduce the external impact or vibration load applied to the bridge in recent years.

As a prior art of such a device, a device using a spring has been disclosed in Korean Unexamined Patent Publication No. 10-2000-0032357.

The previously disclosed patent consists of an upper steel plate installed on the pier upper surface, a lower steel sheet corresponding to the upper steel sheet, and an elastic spring inserted between the upper steel sheet and the lower steel sheet to support the load of the upper structure, thereby solving a conventional problem. I could solve it.

However, the published patent, there is a problem that can not be elastically supported in accordance with the size of the upper structure because the elasticity of the elastic spring can not be adjusted.

In addition, the disclosed patent has a problem that the elastic spring is installed between the upper structure and the bridge of the bridge, so that the elastic spring is not easy to absorb the vibration while supporting the weight of the bridge top plate and the entire girder.

In addition, the published patent has a problem that can not control the vibration caused by the bending of the upper structure itself of the bridge.

Therefore, by adjusting the elasticity of the elastic spring to support the upper structure of the bridge more elastically, to suppress the vibration occurring in the upper structure of the bridge early, at the same time to develop a technology that can solve the problem that the upper structure of the bridge as a whole vibrating This is necessary.

Republic of Korea Patent Publication No. 10-2000-0032357

The present invention has been made to solve the above problems, by adjusting the elasticity of the elastic member installed between the lower member and the upper member vibration that can support the load applied from the upper plate more elastically as the vehicle moves To provide a reduced girder.

In addition, by providing a plurality of elastic members between the top plate and the girder of the bridge, it is possible to locally eliminate the vibration generated in the bridge top plate, to prevent the vibration from the top plate to be transmitted to the girder, and at the same time to prevent the bridge from vibrating as a whole. It is intended to provide a vibration reducing girder.

The vibration reduction girder of the present invention is a vibration reduction girder which is installed on the lower side of the bridge upper plate to support the load applied from the upper plate and absorbs and reduces the vibration of the upper plate. A lower member installed on the girder upper surface; An upper member installed on the bottom surface of the upper plate to correspond to the lower member; An elastic member installed between the lower member and the upper member to absorb and cushion shocks and vibrations transmitted from the upper plate; And an elastic control unit installed between the elastic member and the upper member to adjust the elasticity of the elastic member.

The elastic control unit, the elastic control bolt fixed to the upper member; An elastic adjustment member coupled to the elastic adjustment bolt to press the elastic member; And an elastic adjusting nut fastened to the elastic adjusting bolt to press the upper surface of the elastic adjusting member.

The elastic control member, the elastic control body to move up and down along the elastic control bolt; A through-hole formed so that the elastic adjustment bolt is inserted into the center of the elastic control body; And a coupling guide member protruding from the elastic control body so that the elastic member is coupled to the bottom of the elastic control body.

In addition, the lifting guide portion for guiding the lifting of the elastic control member; may further include.

The lifting guide portion, the lifting guide bolt fixed to the upper member; A rising control nut fastened from the upper portion of the elevating guide bolt to the lower portion to be in close contact with the upper surface of the elastic control member; And

It may include; elevating guide hole penetrated through the elastic control member so that the elevating guide bolt is coupled.

And a flow preventing nut which is fastened to the lifting guide bolt protruding by the lifting guide hole and pressurizes the bottom surface of the elastic control member in close contact with the rising control nut.

The apparatus may further include a first rib plate installed between the girder and the upper plate by connecting the plurality of lower members and the plurality of upper members.

The first rib plate is a pair of plate body formed in the longitudinal direction of the girder to connect the plurality of the lower member and the upper member, therein may be a through-hole deformable in accordance with the impact of the upper plate.

The apparatus may further include a second rib plate installed between the girder and the top plate.

The second rib plate is a pair of plate bodies formed in the longitudinal direction of the girder and the upper plate, and the long hole that is deformable according to the impact of the upper plate may be formed therethrough.

It may be further included; a crack prevention member fixed to each of the rib plate on both sides of the long hole to prevent cracking of the rib plate when the long hole is deformed according to the downward movement of the top plate.

The apparatus may further include a deflection preventing member installed on the girder upper surface and / or the lower member upper surface to prevent excessive deflection of the upper plate.

According to the present invention, by adjusting the elasticity of the elastic member provided between the lower member and the upper member can support the top plate more elastically.

In addition, by providing a plurality of elastic members between the top plate and the girder of the bridge, it is possible to locally eliminate the vibration generated in the bridge top plate, to prevent the vibration from the top plate to be transmitted to the girder, and at the same time to prevent the bridge from vibrating as a whole. have.

1 is a side configuration diagram of a vibration reducing girder as an example of the present invention
Figure 2 is an enlarged perspective view of the main portion of the vibration reduction girder as an example of the present invention
3 is an enlarged exploded perspective view of the main part of FIG.
Figure 4 is an enlarged perspective view of the main part of the vibration reduction girder which is another example of the present invention
5 is an enlarged perspective view of main parts of a vibration reducing girder which is another example of the present invention;
Figure 6 is an installation state of the present invention installed vibration reducing girder as a circular girder
7 is a bottom view of FIG. 6
8 is a cross-sectional view of FIG.
9 is an enlarged view of a portion of FIG. 8;
10 is an installation state diagram of the present invention vibration reduction girder installed in the I-girder
11 is a cross-sectional view of FIG.
12 is an enlarged view illustrating main parts of FIG. 11;
13 is an installation state diagram of the present invention the vibration reduction girder box installed
14 is a cross-sectional view of FIG.
15 is an operating state diagram of an example vibration reduction girder of the present invention
16 is an operating state diagram of a vibration reducing girder that is another example of the present invention
17 is an operating state of the vibration reduction type girder which is another example of the present invention
18 is an operating state of the elastic control unit of the vibration reduction girder to which the present invention is applied
19 is an operating state diagram of a vibration reducing girder which is another example of the present invention

Hereinafter, some embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the reference numerals to the components of the drawings, the same components are to have the same reference numerals as much as possible even if displayed on different drawings. In addition, in describing the embodiments of the present invention, when it is determined that a detailed description of a related well-known configuration or function interferes with the understanding of the embodiments of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected or connected to that other component, but there is another component between each component. May be “connected”, “coupled” or “connected”.

1 is a side configuration diagram of a vibration reducing girder to which the present invention is applied, FIG. 2 is an enlarged perspective view of a main portion of a vibration reducing girder as an example of the present invention, and FIG. 3 is an enlarged exploded perspective view of the main portion of FIG. It is an enlarged perspective view of the principal part of the vibration reduction girder which is another example of this invention.

The vibration reduction girder 100 of the present invention is a vibration reduction girder that is installed under the bridge upper plate 10 to support a load applied from the upper plate 10 and simultaneously absorbs and reduces vibration of the upper plate. 110 ′), the lower member 110, the upper member 120, the elastic member 130, and the elastic control unit 140.

The girder 110 ′ may be any one of an I type girder, a circular girder, and a box girder, and the circular girder may include a support for supporting the lower member 110.

The lower member 110 is installed on the girder 110 ′ to support the elastic member 130, and is formed of a plate-shaped steel plate, and the coupling guide member 111 to which the elastic member 130 is coupled to the upper surface. ) Is projected.

The upper member 120 is formed of a plate-shaped steel plate in a configuration that is installed on the bottom surface of the upper plate 10 so as to correspond to the lower member 110.

The elastic member 130 is a spring installed between the lower member 110 and the upper member 120 to absorb and cushion the shock and vibration transmitted to the upper plate 10, and includes a coil spring and a leaf spring, It can be formed in two sets or four sets.

The elastic adjustment unit 140 is installed between the elastic member 130 and the upper member 120 to adjust the elasticity of the elastic member 130, the elastic adjustment bolt 141, the elastic adjustment nut 142 ), And an elastic control member 143.

The elastic adjustment bolt 141 is a bolt fixed to the upper member 120 by welding or the like.

The elastic adjusting nut 142 is a nut that is fastened to the elastic adjusting bolt 141 to control the rising of the elastic adjusting member 143.

The elastic control member 143 is configured to press the elastic member 130 while lifting along the elastic control bolt 141, and includes an elastic control body 143a, a through-hole 143b, a coupling guide member 143c. do.

The elastic control body 143a is a body formed of a plate-shaped steel plate.

The through hole 143b is a through hole formed in the center of the elastic control body 143a.

The coupling guide member 143c protrudes from the bottom of the elastic control body 143a so that the elastic member 130 is coupled thereto.

In addition, the elevating guide portion 150 for guiding the elevating of the elastic control member 143, the elevating guide portion 150 is the elevating guide bolt 151, the elevating control nut 152, elevating guide hole 153.

The lifting guide bolt 151 is a bolt that is fixed to the upper member 120 by welding or the like, and is formed in a pair to face the upper member 120 around the elastic adjustment bolt 141 or '+' character. It may be formed radially in shape or at each corner.

The lift control nut 152 is a nut which is fastened to the lift guide bolt 151 and is in close contact with the upper surface of the elastic control member 143.

The lifting guide hole 153 is a through-hole penetrated through the elastic adjustment member 143 so that the lifting guide bolt 151 is coupled.

It may further include a flow preventing nut 154 is fastened to the lifting guide bolt 151 protruding to the lifting guide hole 153 to press the bottom of the elastic control member 143, the flow preventing nut 154 The bottom surface of the elastic control member 143 whose upper surface is in close contact with the rising control nut 151 may be pressed in close contact with each other to prevent the elastic control member 143 from flowing.

In addition, the plurality of lower members 110 and the plurality of upper members 120 may be connected to each other to further include a first rib plate 160 installed between the girder 110 ′ and the upper plate 10.

The first rib plate 160 is a pair of plate bodies formed in the longitudinal direction of the girder 110 'or the upper plate 10 to connect the plurality of lower members 110 and the upper member 120, the inside The long hole 161 that is deformable according to the impact of the upper plate 10, that is, the long hole 161 is elongated in the axial direction is formed through.

In addition, as shown in FIG. 5, the second rib plate 170 may be further provided between the girder 110 ′ and the upper plate 10.

The second rib plate 170 is a pair of plate bodies formed in the longitudinal direction of the girder 110 ′ and the upper plate 10, and a long hole 171 that is deformable according to the impact of the upper plate 10 is formed therein. Penetrating. Unlike the first rib plate 160, the second rib plate 170 is spaced apart from the lower member 110 and the upper member 120 by a predetermined interval in the lateral direction.

The long holes 161 and 171 may be formed to penetrate through the rib plates 160 and 170 in a longitudinal direction or to be spaced apart at a predetermined interval.

The long holes 161 and 171 may be formed such that lower ends thereof are opened to the rib plates 160 and 170.

In addition, when the long holes 161 and 171 are deformed according to the downward movement of the upper plate 10, the crack preventing member 180 may further include a crack preventing member 180 to prevent cracks of the rib plates 160 and 170. The crack preventing member 180 is formed in a plate shape and is fixed to each of the rib plates 160 and 170 on both sides of the long holes 161 and 171 by welding.

In addition, the upper plate 10 may further include a deflection prevention member 190 to prevent excessive deflection, the deflection prevention member 190 is formed in a housing to the upper surface or the lower member of the girder (110 '). It may be installed on the upper surface of the (110). The sag prevention member 190 may be formed of an elastic material capable of absorbing the shock in its entirety, or an elastic plate may be attached to the upper side.

The following describes the construction process of the present invention vibration reduction girder configured as described above.

First, as shown in Figure 3, according to the design drawing, the elastic adjustment bolt 141 of the elastic control unit 140 is installed in the center of the bottom surface of the upper member 120, two sets of two centering around the elastic control bolt 141. Or install the elevating guide bolt 151 of the elevating guide unit 150 is provided in one set of four.

In addition, the elastic adjustment bolt 141 is fastened by rotating the elastic adjustment nut 142 in the forward direction, the lifting guide bolt 151 is fastened by rotating the lifting control nut 152 in the forward direction, each nut is Tighten up to the top of each bolt.

And coupled to the elastic adjustment bolt 141 through the hole 143b of the elastic control member 143 and at the same time to guide the lifting guide hole 153 formed through the elastic control body 143a of the elastic control member 143 Coupled to the bolt 151, the elastic control body 143a of the elastic control member 143 by moving in the direction of the elastic control bolt 141, the upper surface of the elastic control body 143a is in close contact with the elastic control nut 142 Be sure to

And when the elastic adjustment nut 142 is in close contact with the upper surface of the elastic control body 143a, the bottom of the rising control nut 152 is the upper surface of the elastic control body 143a while rotating the upward control nut 152 in a reverse direction to move downward. After being in close contact with, the flow preventing nut 154 is fastened to the lifting guide bolt 151 by being in close contact with the bottom of the elastic control body 143a.

The upper surface of the flow preventing nut 154 is in close contact with the bottom of the elastic control body 143a and the rising control nut 152 is in close contact with the upper surface of the elastic control body 143a. The phenomenon of detaching from the bolt can be prevented.

In addition, the upper end of the elastic member 130 is coupled to the coupling guide protrusion 143c protruding from the bottom of the elastic control body 143a, the coupling guide protrusion of the lower member 110 to the lower end of the elastic member 130. Combine (111).

The coupling guide protrusions 143c and 111 may be disposed to be in contact with the elastic member 130 and may be located outside or inside the elastic member 130.

As described above, the lower member 110 and the upper member 120 to which the elastic member 130 and the elastic control unit 140 are assembled, as shown in FIGS. It is seated on the upper surface of the girder and fixed by welding or the like, and is formed in the longitudinal direction of the girder 110 'on both sides of the lower member 110 and the upper member 120 fixed to the upper surface of the girder 110'. The first rib plate 160 to which the crack preventing member 180 is fixed may be installed at both sides of the 161.

In addition, as shown in Figures 10 to 12, the girder (110 ') that is seated on the pier, that is, seated on the upper surface of the I-type girder fixed by welding, etc., the lower member 110 and the upper member 120 The second rib plate 170 is formed in the longitudinal direction of the girders 110 'on both sides of the girders 110' and spaced apart by a predetermined distance, and the crack preventing member 180 is fixed to both sides of the long hole 171. Can be installed.

In addition, as shown in Figures 13 to 14, the upper surface of the box-shaped girders are seated at regular intervals to be fixed by welding, etc., the girder 110 'on both sides spaced apart from the lower member 110 and the upper member 120 by a predetermined interval. The second rib plate 170 may be installed on the upper surface thereof in the longitudinal direction of the girder 110 ′ and the crack preventing member 180 is fixed to both sides of the long hole 171.

The girder 110 ′ is any one of an I type girder, a circular girder, and a box girder, and a first rib plate 160 is installed in the circular girder, and a second rib plate 170 in the I type girder and the box girder. Although described as being installed, it is not limited thereto, and the first or / and second rib plates 160 and 170 may be installed on each girder.

When the girders 110 'form a pair of girders, the girders may be connected in a horizontal beam. The circular girder may include a support for supporting and supporting the lower member 110 to maintain the lower member 110 of the bridge pedestal 100 horizontally.

When the bridge pedestal 100 is fixed to the upper surface of the girder 110 ′, the deflection preventing member 190 may be installed on either the upper surface of the girder 110 ′ or the upper surface of the lower member 110. The deflection preventing member 190 may prevent the bridge top plate from excessive deflection. The sag prevention member 190 may be formed entirely of an elastic material, or an elastic plate may be attached to an upper surface thereof.

In the above process, the lower member 110 is seated on the upper surface of the girder 110 ′, and the upper member 120 is mounted on the bottom surface of the first rib plate 160 or / and the second rib plate 170. The upper plate 10 is seated on an upper surface of the upper member 12 and the first rib plate 160 or / and the second rib plate 170 to form a bridge structure.

At this time, when the upper plate 10 is seated on the upper member 120, the upper member 120 and the first rib plate 160 or / and the second rib plate 170, the load of the upper plate 10 It does not flow from side to side.

The vehicle moves to the upper plate 10 of the bridge structure formed as described above, and the vibration generated by the impact and the shock generated by the movement of the vehicle is transmitted to the bridge pedestal 100 through the upper plate 10.

The shock and vibration transmitted to the bridge pedestal 100, as shown in Figure 15, the elastic adjustment bolt 141 and the elastic adjustment nut 142 of the elastic adjustment unit 140 through the upper member 120 of the bottom of the upper plate 10 ) And the elevating guide bolt 151 and the elevating control nut 152 of the elevating guide part 150 to the elastic member 130 via the elastic adjusting member 143.

Since the elastic member 130 is composed of a spring for absorbing shock, the shock and vibration are canceled while absorbing and cushioning the shock and vibration transmitted from the upper plate 10. This action can be absorbed locally after the vibrations occurring in the bridge deck. In the prior art, the bridge top plate and the girder vibrate together greatly, and the structural problems caused by the overlapping vibrations can be completely solved.

In addition, as shown in FIG. 16, the long holes 161 and 171 of the first rib plate 160 and / or the second rib plate 170 are deformed by the shock and vibration transmitted from the upper plate 10. Damage to the girder 110 ′ due to the shock and vibration transmitted from the upper plate 10 may be reduced by preventing shock and vibration transmitted from the upper plate 10 to prevent the transfer to the girder 110 ′.

The long holes 161 and 171 are formed to penetrate through the rib plates 160 and 170 in a lengthwise direction or spaced apart at a predetermined interval, or are formed to be opened at lower portions thereof, thereby deforming by shock and vibration and thus shock and vibration. Can be absorbed and mitigated.

17, when the long holes 161 and 171 are deformed to absorb shocks and vibrations, each of the rib plates 160 and 170 on both sides of the long holes 161 and 171 has a crack preventing member 180. ) Is fixed, it is possible to prevent the generation or progress of cracks of each of the rib plate (160, 170) according to the deformation of the long hole (161, 171).

In addition, in order to adjust the elasticity of the elastic member 130 by falling off the elastic force of the elastic member 130, as shown in Figure 18, by lifting the flow preventing nut 154 of the lifting guide part 150 in the reverse direction (elevating guide bolt ( After moving to the lower portion of 151, the elastic adjustment nut 142 of the elastic control unit 140 is rotated in the reverse direction to move downward.

At this time, when the bottom surface of the elastic control nut 142 presses the upper surface of the elastic control body 143a of the elastic control member 143, the elastic control body 143a is pressed through the pressing force of the elastic control nut 142. 143b) is moved to the lower portion of the elastic adjustment bolt 141, the lifting guide hole 153 is moved to the lower portion of the lifting guide bolt 151, the bottom of the elastic control body 143a compresses the elastic member 130 By adjusting the elastic force of the elastic member 130.

When the elastic force of the elastic member 130 is adjusted by the above process, while moving upwardly moving the lifting control nut 152 fastened to the lifting guide bolt 151 in the reverse direction to be in close contact with the upper surface of the elastic control body 143, The flow preventing nut 154 may be moved upward while rotating in the forward direction to closely contact the bottom of the elastic adjusting body 143 to prevent the flow of the elastic adjusting member 143.

In order to adjust elasticity of the elastic member 130, the position of the long hole 161 may be adjusted, or a separate configuration may be additionally installed at the elastic member 130. For example, a cover can be installed.

In addition, when the upper plate 10 suddenly descends while deforming the elastic member 130 and the rib plates 160 and 170 due to the shock and vibration transmitted from the upper plate 10, the girder as shown in FIG. 19. Since the sag prevention member 190 installed on the upper surface and / or the lower member 110 may support the upper plate 10, the damage of the upper plate 10 may be prevented. In the case of the drawings, the deflection of the top plate is somewhat excessive to explain the operation relationship.

In the above description, all elements constituting the embodiments of the present invention are described as being combined or operating in combination, but the present invention is not necessarily limited to the embodiments. That is, within the scope of the present invention, all of the components may be configured or operated by selectively combining one or more of them. In addition, the terms "comprise", "comprise" or "having" described above mean that the corresponding component may be inherent unless specifically stated otherwise, and thus excludes other components. It should be construed that it may further include other components instead. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. Terms commonly used, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be interpreted in an ideal or excessively formal sense unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

100: bridge pedestal 110: lower member
120: upper member 130: elastic member
140: elastic control unit 150: lifting guide
160: first rib plate 170: second rib plate
180: crack preventing member 190: deflection preventing member

Claims (10)

As a vibration reduction type girder installed under the bridge top plate to support the load applied from the top plate and to absorb and reduce the vibration of the top plate,
Girders installed on piers or shifts;
A lower member installed on the girder upper surface;
An upper member installed on the bottom surface of the upper plate to correspond to the lower member;
An elastic member installed between the lower member and the upper member to absorb and cushion shocks and vibrations transmitted from the upper plate;
An elastic control unit installed between the elastic member and the upper member to adjust elasticity of the elastic member; And
And a first rib plate installed between the girder and the upper plate by connecting the plurality of lower members and the plurality of upper members.
The first rib plate is a pair of plate body formed in the longitudinal direction of the girder to connect the plurality of the lower member and the upper member, vibration reduction type girder through which the deformable long hole is formed through the impact of the upper plate. As a vibration reduction type girder installed under the bridge top plate to support the load applied from the top plate and to absorb and reduce the vibration of the top plate,
Girders installed on piers or shifts;
A lower member installed on the girder upper surface;
An upper member installed on the bottom surface of the upper plate to correspond to the lower member;
An elastic member installed between the lower member and the upper member to absorb and cushion shocks and vibrations transmitted from the upper plate;
An elastic control unit installed between the elastic member and the upper member to adjust elasticity of the elastic member; And
And a second rib plate installed between the girder and the top plate.
The second rib plate is a pair of plate body formed in the longitudinal direction of the girder and the top plate, vibration reduction type girder through which the long hole deformable in accordance with the impact of the top plate. The method according to claim 1 or 2,
The elastic control unit,
An elastic adjustment bolt fixed to the upper member;
An elastic adjustment member coupled to the elastic adjustment bolt to press the elastic member; And
And an elastic adjustment nut fastened to the elastic adjustment bolt to press the upper surface of the elastic adjustment member. The method according to claim 3,
The elastic control member,
An elastic control body for elevating along the elastic control bolt;
A through-hole formed so that the elastic adjustment bolt is inserted into the center of the elastic control body; And
And a coupling guide member protruding from the elastic control body so that the elastic member is coupled to the bottom of the elastic control body. The method according to claim 3,
And a lifting guide part for guiding the lifting and lowering of the elastic control member. The method according to claim 5,
The elevation guide unit,
A lifting guide bolt fixed to the upper member;
A rising control nut fastened from the upper portion of the elevating guide bolt to the lower portion to be in close contact with the upper surface of the elastic control member; And
And a lifting guide hole penetrating the elastic adjusting member so that the lifting guide bolt is coupled thereto. The method according to claim 6,
And a flow preventing nut which is fastened to the elevating guide bolt protruding by the elevating guide hole and pressurizes the bottom surface of the elastic control member in close contact with the elevating control nut. delete The method according to claim 1 or 2,
And a crack preventing member fixed to each of the rib plates on both sides of the long hole to prevent cracks of the rib plate when the long hole is deformed according to the downward movement of the upper plate. The method according to claim 1 or 2,
Vibration reducing girder further comprising; sagging prevention member is installed on the upper surface of the girder and / and the lower member to prevent excessive deflection of the upper plate.

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