KR200267332Y1 - A Structural Bearing with a Double Shock Absorbing Device - Google Patents

Abstract

The present invention relates to a bridge device having a double buffer structure that adopts a double buffer structure to compensate for the heat displacement of the bridge deck and at the same time to stabilize the bridge so as not to impact the bridge by relieving a sudden lateral impact force such as earthquake.

The bridge device having a double buffer structure according to the present invention is equipped with an impact transmitter that allows a long displacement to absorb the thermal deformation and vibration in the longitudinal direction can protect the bridge even in the large stretch amount of the long bridge. In particular, by adopting a double shock absorbing structure, a sudden lateral impact force such as an earthquake or the like can be quickly dealt with through the shock absorbing member. In addition, by fastening the shock absorbing member by bolts and nuts from the outside, there is an advantage that the shock absorbing member can be easily replaced by damage or degradation of performance.

Description

A Structural Bearing with a Double Shock Absorbing Device

The present invention relates to a bridge device for stably supporting a top plate on a bridge in a bridge structure. More specifically, it adopts a double buffer structure to compensate for thermal displacement of the bridge top plate, and at the same time, a sudden lateral impact force such as an earthquake. The present invention relates to a bridge device having a double buffer structure that stabilizes the bridge so as not to impact the bridge.

In general, a bridge device is a device installed so that the upper plate, which is a slab structure of a bridge, is properly mounted on a bridge that supports the bridge, and has a variety of forms and functions according to a bridge specification or a supporting load.

One of the conventional teaching devices is the use of elastic rubber and lead, which has a seismic isolation function for the entire transverse direction regardless of the direction of the earthquake, but is limited to the shock absorption, so it is used only for small structures. Not only does the rubber at the contact surface with lead melt, but it is also difficult to replace.

In addition to the use of elastic rubber and special rubber, which has good durability and seismic isolation function for the entire transverse direction, but also has a problem that the seismic strength is low and difficult to maintain.

In addition, although viscous dampers may be installed between the piers and the top plate to absorb the lateral forces caused by the earthquake, they can only absorb the lateral forces acting in the direction in which the viscous dampers are installed, and they should be installed separately from the support. Therefore, there is a problem that is uneconomical and poor construction.

Related to other teaching devices, there is one published in Korean Patent Publication No. 2000-58244 "Shock Transfer Machine", but the structure is complicated and the lateral force acts in the other direction because it can only absorb the lateral force in one direction. If you do not have a problem that does not function at all.

The existing bridge devices have a problem that the bridge is not long enough to absorb them when the thermal displacement is large, and to quickly alleviate the sudden impact such as an earthquake.

Therefore, the object of the present invention is to devise to solve the above-mentioned defects, by adopting a double buffer structure to compensate for the thermal displacement of the bridge deck and to reduce the impact force of the rapid transverse direction, such as earthquake, to impact the bridge It is to provide a stabilization device having a double buffer structure to prevent this from going.

Detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, the number designating the corresponding parts in the drawings are the same.

1 is an exploded perspective view showing an embodiment of a teaching device having a double buffer structure according to the present invention,

2A and 2B are longitudinal cross-sectional views and a cross-sectional view taken along line A-A of FIG. 1,

3 is a cross-sectional view showing the internal structure of the shock transmitter shown in FIG.

4a and 4b is a cross-sectional view and a cross-sectional view taken along line B-B of another embodiment of a teaching device having a double buffer structure according to the present invention,

Figure 5 is a cross-sectional view showing another embodiment of the bridge device having a double buffer structure according to the present invention,

Figure 6 is a cross-sectional view showing a further embodiment of the bridge device having a double buffer structure according to the present invention.

** Explanation of symbols for main parts of drawings **

100: lower plate 102: guide groove

104: sliding plate 110,110a: rod support plate

200: upper plate 210: guide frame

212: sliding plate 214: mounting hole

220: guide plate 230: bolt

232: nut 300: moving body

310: lower moving plate 312: guide protrusion

314: contact plate 316: lower seat

320: upper moving plate 322: support hole

324: contact plate 326: sliding plate

328: upper seat 330, 330a: buffer disk

332: metal ring 340: fixing pin

400,400a: Shock Transmitter 410: Cylinder

420: piston rod 430: silicon putty

440: piston 442: orifice

500 ~ 500c: Shock absorbing member 502: Hollow

510: mount 512: nut

520,520a: Contact plate

In the bridge device having a double buffer structure according to the present invention for achieving the above object is installed on the bridge pier to support the load of the top plate and buffer the force acting between the bridge and the top plate, the pier A bottom plate fixed on the top; A movable body fixedly movable on the lower plate; At least one impact transmitter connecting the movable body and the lower plate and buffering an impact acting in a bridge length direction between the bridge and the upper plate; A top plate movably mounted on the moving body and having a rectangular guide frame at a bottom thereof; And a buffer member installed between the guide frame of the upper plate and the side of the movable body to absorb shocks in all directions acting between the piers and the upper plate.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to a preferred embodiment of the present invention.

1 is an exploded perspective view showing an embodiment of a bridge device having a double buffer structure according to the present invention. 2A is a longitudinal cross-sectional view of the combined state of FIG. 1, and FIG. 2B is a cross-sectional view taken along the line A-A of FIG. 2A.

As shown in Figs. 1 and 2A, the apparatus is provided with a lower plate 100 attached to a pier and positioned on the lower plate 100 so as to be able to flow in a pier length direction and a width direction, and on the upper portion thereof. An upper plate 200 to which the upper plate of the bridge is fixed, and a moving body interposed between the upper plate 200 and the lower plate 100 to allow the lower plate 100 and the upper plate 200 to flow at a certain displacement ( 300). Furthermore, an impact transmitter 400 is provided between the movable body 300 and the lower plate 100 in the longitudinal direction of the bridge to allow a constant displacement in the bridge length direction while acting as a rigid body during an earthquake. In addition, the upper portion of the moving body 300 spaced apart from the impact transmitter 400 by a buffer member 500 is installed in all four directions to alleviate the swing in the longitudinal direction and the width direction of the bridge top plate together. In general, the present invention having the above configuration will be described in detail.

A straight guide groove 102 is formed in the upper portion of the lower plate 100. The guide groove 102 is inserted into the guide protrusion 312 of the movable body 300 mounted on the lower plate 100 to guide the movement of the movable body 300 while moving along it. Of course, the guide groove 102 may be formed in the bottom surface of the moving body 300 and the guide protrusion 312 is formed in the upper surface of the lower plate 100 corresponding thereto. The upper surface portion of the lower plate 100 and the lower surface portion of the movable body 300 which are in contact with each other are attached with a sliding plate 104 made of stainless steel and a contact plate 314 made of fluorine resin having a small friction coefficient therebetween. . The sliding plate 104 polishes the stainless steel plate well to minimize frictional resistance so that the contact plate 314 slides well during vibration. Therefore, the frictional resistance with the lower plate 100 when the moving body 300 is moved can be reduced.

The movable body 300 is composed of a lower movable plate 310 having a linear guide protrusion 312 formed in the bottom portion as described above, and an upper movable plate 320 fixed to an upper portion of the lower movable plate 310. In the meantime, there is interposed a buffer disk 330, which serves as a buffer according to vertical fluctuations. The buffer disk 330 is made of polyurethane (Polyurethane), the upper movable plate 320 and the lower movable plate (320) by a fixing pin 340 for coupling the upper movable plate 320 and the lower movable plate 310 ( 310 is coupled between the interposed state. In particular, the buffer disk 330 is a high-strength polyurethane plate designed to accommodate the average compressive stress 5.0Ksi and to allow rotation, and has a concave groove on the outside to accommodate a suitable compression deformation and there is a suitable rotation margin inside. Usually, the allowable rotation amount of the buffer disk 330 is 0.02 Rad, and the allowable amount can be increased if necessary. In addition, the fixing pin 340 rotatably supporting the buffer disk 330 is a high-strength pin designed to accommodate rotation, and is designed to withstand shear, bending, and bearing. do. As such, the upper and lower movable plates 310 and 320 rotate mutually when the bridge vibrates because the upper movable plate 320 and the lower movable plate 310 are coupled to each other through the buffer disk 330 by the fixing pin 340. The displacement in the direction is accommodated and buffered.

The cylinders 410 of the impact transmitters 400 and 400a are fixed to both side surfaces of the lower movable plate 310, and the piston rod 420 of the cylinder 410 has both sides of the lower plate 100 corresponding to both ends thereof. It is fixed to the rod support plate portion (110, 110a) protruding vertically from. Therefore, when the lower movable plate 310 moves, the displacement is allowed by the shock transmitters 400 and 400a fixed to both sides thereof. An example of the impact transmitters 400 and 400a is shown in FIG. 3, which will be described in detail with reference to FIG. 3.

The upper movable plate 200 fixed on the lower movable plate 100 is provided with buffer members 500, 500a, 500b, and 500c in all directions. The shock absorbing members 500, 500a, 500b and 500c are cylindrical springs made of polyurethane and have a compression coefficient of 16 times larger than rubber and are designed to withstand hundreds of thousands of high-speed shocks. About two to eight are mounted, but in this embodiment four are mounted in all directions. The shock absorbing members 500, 500a, 500b, and 500c provide a continuous restoring force between the guide frame 210 and the upper movable plate 200, which will be described later, to prevent excessive displacement between the upper and lower structures of the bridge, and the earthquake. After the original position of the upper structure to be restored. In particular, the buffer members 500, 500a, 500b, and 500c preferably allow the deflection displacement to be about 30% of the total length when constant displacement is applied, and to allow the displacement to be about 60% during an earthquake. Do. As the buffer member, other elastic bodies may be used instead of the MER spring.

As shown in FIG. 2B, the shock absorbing members 500, 500a, 500b, and 500c having such a function are provided with a hollow 502 of the shock absorbing members 500, 500a, 500b, and 500c. While penetrating through the support plate 322 perforated in all directions to the upper plate 320 is inserted and supported. At this time, the box-shaped guide frame 210 having an inner surface in close contact with the outer end of the buffer member (500, 500a, 500b, 500c) is fixed to the bottom portion of the upper plate (200). The guide frame 210 regulates the shock absorbing members 500, 500a, 500b, and 500c from escaping from the upper movable plate 320 to maintain the resistance stiffness of the shock absorbing member during vibration, and at the same time, foreign matter penetrates into the shock absorbing member. It prevents the friction surface and to prevent the corrosion of the cushioning member to maintain the durability, the stainless steel sliding plate 212 is attached to the portion in close contact with the buffer member (500,500a, 500b, 500c) In addition, the contact surface 520 of the fluorine resin is provided on the end side of the buffer member (500, 500a, 500b, 500c) in close contact with the stainless steel to reduce the friction when swinging. Therefore, the sliding plate 212 fixed to the guide frame 210 of the upper plate 200 and the contact plate 520 fixed to the shock absorbing members 500, 500a, 500b, and 500c during the shaking of the bridge closely contact the buffer member ( 500, 500a, 500b, and 500c are compressed, and the mounting table 510 enters the inside of the upper moving plate 320 through the support hole 322 by the displacement thereof. The contact plate 324 of fluororesin and the sliding plate 220 of stainless steel are respectively attached to the upper surface of the upper plate 320 and the lower surface of the upper plate 200 in contact therewith to reduce friction. .

As described above, a contact plate of stainless steel and a contact plate of fluororesin is attached to the contacting and mutually moving parts, and the contact plate is coated with polytetra fluoro ethylene (PTFE) coating. It is preferable to use. PTFE is a milky white, flexible resin. In particular, the upper plate 200 and the upper plate 200 seated thereon do not need to have a large sliding in the horizontal direction because of the vertical load, and thus attached to the upper surface of the upper plate 320 The contact plate 324 is preferably designed to have a large coefficient of friction with the sliding plate 220 of stainless steel in contact therewith, and about 0.15 to 0.08 is appropriate. To this end, a special PTFE containing a lot of carbon is used as the contact plate 324 attached to the upper plate 320. In addition, since the lower movable plate 310 has a lot of displacement in the horizontal direction in the lower plate 100, the contact plate 314 of the lower movable plate 310 in contact with the sliding plate 104 of the lower plate 100 is It is desirable to reduce the friction coefficient to about 0.03.

3 is a cross-sectional view showing the internal structure of the shock transmitter shown in FIG. 1, the shock transmitter 400 is fixed to the above-described lower movable plate as shown, and the silicon putty (Silicon Putty) 430 therein. And a piston rod 420 which protrudes to both sides through the cylinder 410 filled with the spool and is fixed to the lower plate as described above. In addition, it is fixed on the approximately central portion of the piston rod 420 located inside the cylinder 410, and partitions the inside of the cylinder 410 into two spaces so that the silicon putty 430 filled in the two spaces can be moved to another space. And a piston 440 having an orifice 442 formed therein. The silicon putty 430 is a semi-fluid gel (Gel) type, the material is filled in the shock transmitting device for shock relaxation. The silicon putty 430 serves to disperse the force transmitted to the bridge by acting as a rigid body against the external force at high speed without disturbing the movement of the bridge deck at low speed. With this structure, when the shock in the axial direction of the piston rod 420 occurs, the silicon putty 430 filled in the space in the moving direction of the cylinder 410 through the orifice 442 while the rod 420 moves The shock is alleviated by generating resistance to the piston 440 while flowing to the other space. On the contrary, even if the cylinder 410 is moved, the piston rod 420 may have the same effect. The shock absorbing force of the impact transmitter 400 may be adjusted by adding or subtracting the number or diameter of the orifice 442. Of course, as in the present embodiment, a gap may be formed between the piston 440 and the inner wall of the cylinder 410 without forming the orifice 442 in the piston 440 to enable the flow of the silicon putty 430. have. The shock transmitter 400 has a weaker elastic strength than the above-described shock absorbing member to operate before the shock absorbing member to absorb shock when the shock occurs, and the shock absorbing member secondaryly absorbs the shock.

Hereinafter, the operation of the apparatus will be described in detail with reference to FIGS. 1 to 3.

When the displacement occurs due to thermal expansion of the bridge, there is a change in length of the bridge in the longitudinal direction. Then, the cylinder rod 420 is contracted / expanded in the cylinder 410 of the impact transmitter 400. The fixed lower movable plate 310 and the lower plate 100 to which the piston rod 420 is fixed are moved to each other. Accordingly, the piston 440 in the impact transmitter 400 is moved, where the piston 440 is allowed to displace while being resisted by the silicon putty 430. As the piston 440 moves, the silicon putty 430 filled in the cylinder 410 through the orifice 442 moves to the other compartment and gradually decreases the resistance applied to the piston 440 to allow displacement. It exhibits buffering performance. At this time, the lower movable plate 310 is guided in a linear direction while the guide protrusion 312 is moved in the guide groove 102 of the lower plate 100. When the sliding plate 104 of the stainless steel sliding plate 104 and the fluorine resin contact plate 314 is formed in contact with the lower plate 100 and the lower movable plate 310 respectively, the frictional resistance decreases and the smooth sliding motion Done. In addition, the vertical displacement of the bridge is buffered while the buffer disk 330 contracts or expands, and the torsion is also absorbed there.

On the other hand, when a sudden shock such as an earthquake is transmitted to the device, the impact transmitter 400 acts as a rigid body and is momentarily stopped, and such impact is transmitted to the shock absorbing members 500, 500a, 500b, and 500c. Accordingly, while the upper plate 200 moves in the upper movable plate 320, the shock absorbing members 500, 500a, 500b, and 500c contract and expand momentarily to absorb the instantaneous shock. Since the shock absorbing members 500, 500a, 500b, and 500c are arranged in all directions, a pair of shock absorbing members disposed on both sides of the straight line absorb the shock in the elastic direction, and the vibration in the direction substantially perpendicular thereto is perpendicular to the shock absorbing member. The other pair of shock absorbing members arranged in a straight line is absorbed. At this time, the swing of the shock absorbing members 500, 500a, 500b, and 500c in the left and right direction is slid on the sliding plate 212 of the guide frame body 210 in contact with the contact plate 520 attached to the end thereof. Relaxed. Of course, the displacement in the vertical direction at this time is absorbed while the buffer disk 330 interposed between the upper plate 310 and the lower plate 320 is expanded and contracted.

Figure 4a is a cross-sectional view showing a second embodiment of the bridge device having a double buffer structure according to the present invention, Figure 4b is a cross-sectional view taken along line B-B of Figure 4a. In this embodiment, the coupling structure of the shock absorbing member is slightly changed for convenience of replacement of the shock absorbing member in the embodiment disclosed in FIG. 1, except for the coupling part of the shock absorbing member. Therefore, the description of the same parts as in FIG. 1 will be omitted, and only different parts will be described.

As shown, in the present embodiment, the box-shaped guide frame 210 is vertically mounted to the bottom of the upper plate 200 to which the bridge top plate is fixed, and the bolt 230 is vertically fastened by a nut 232 at the bottom thereof. In addition, the buffer member 500 coupled to the mounting frame 510 is horizontally in contact with the inside of the guide frame 210, and penetrates through the mounting hole 214 formed horizontally thereto to be fastened with a nut 512 from the outside. It is fixed. Accordingly, the inner end of the shock absorbing member 500 is in close contact with the corresponding side surface of the upper movable plate 320 of the moving body 300, wherein the contact portion (PTFE) (520a) and, A sliding plate 326 is attached to guide the swing of the contact plate in close contact. The contact plate 520a is made of fluorine resin and the sliding plate 326 is made of stainless steel having a small coefficient of friction with the fluorine resin.

As described above, the shock absorbing member 500 is fixed to the guide frame 210 of the upper plate 200 to be in contact with the side surface of the upper movable plate 320 to be compressed or expanded while the upper side swings to the side. Along with the sliding plate 326 of the moving plate 320 is in contact with the contact plate 520a of the inner end is sliding.

Figure 5 is a cross-sectional view showing another embodiment of the bridge device having a double buffer structure according to the present invention. This embodiment is to change the structure of the upper plate and the lower plate of the moving body in the embodiment disclosed in Figure 4, in the present embodiment will be described in detail by extracting only the changed portion in FIG.

An upper seating portion 328 is formed on a bottom surface of the upper movable plate 320 of the movable body 300, and a lower seating portion on an upper surface of the lower movable plate 310 corresponding to the upper seating portion 328. 316 is formed. In the present embodiment, the lower seating portion 316 forms a protrusion as shown, and the upper seating portion 328 seated thereon is recessed to form mutually uneven coupling, wherein the buffer disk 330a is interposed therebetween. It will be intervened. The shock absorbing disk 330a has the same function as the shock absorbing disk disclosed in FIGS. 1 to 4 for buffering up and down fluctuations, and its material is made of rubber, and the metal ring 332 is installed at its lower outer periphery. This prevents the female from being separated from the upper seat portion 328. Here, it is preferable to shape the upper seating portion 328 and the lower seating portion 316 into a cylindrical shape, because it may cause torsion to the left and right when the bridge swings up and down, elastic buffer disk 330a in the torsion This is because the upper movable plate 320 is pivoted to some extent in the lower movable plate 310 and the twist of the torsion can be alleviated while effectively twisting. Of course, the upper seating portion 328 and the lower seating portion 316 may be shaped into polygonal cross sections, such as octagons and hexagons. In this embodiment, the upper seating portion and the lower seating portion is coupled to each other by the protrusion, but it is also possible to combine the upper seating portion as a protrusion and the lower seating portion as the recessed portion.

On the other hand, in the present embodiment, the nut hole 234 is formed in the upper plate 200 on which the guide frame body 210 is mounted, and the bolt 230a is inserted into and fixed to the lower side of the guide frame body 200.

Figure 6 is a cross-sectional view showing a further embodiment of the bridge device having a double buffer structure according to the present invention.

In the present embodiment, the structure disclosed in FIG. 1 is employed as the mounting structure of the shock absorbing member in the apparatus disclosed in FIG. 5, which is described in detail with reference to FIG. 1.

The shock absorbing member 500 has a mounting hole 510 fastened to the inner side of the outer end portion of the support hole 322 perforated in all directions on the upper movable plate 320 while passing through the hollow 502 of the shock absorbing member 500. It is inserted and supported, the box-shaped guide frame 210 having an inner surface in close contact with the outer end of the buffer member 500 is fixed to the bottom of the upper plate 200. A sliding plate 212 made of stainless steel is attached to a portion of the guide frame 210 that is in close contact with the shock absorbing member 500, and the friction coefficient with the stainless steel is attached to an end side surface of the shock absorbing member 500 that is in close contact therewith. The contact plate 520 of fluorine resin is provided, which can reduce contact friction during vibration.

Therefore, in the apparatus having such a structure, when a displacement due to thermal expansion of a bridge occurs, the impact transmitter while the piston rod 420 contracts / expands in the cylinder 410 of the impact transmitter 400 fixed to the lower plate 100. The resistance and elasticity of the silicon putty (not shown) filled in 400 allows the displacement.

On the other hand, when a sudden shock such as an earthquake is transmitted to the device, the shock transmitter 400 acts as a rigid body and the shock absorbing action in the shock transmitter 400 is stopped, and such shock is transmitted to the shock absorbing member 500. Accordingly, the upper plate 200 and the upper movable plate 320 are rocked, respectively, so that the buffer member 500 interposed between the upper plate 200 and the upper movable plate 320 contracts and expands to absorb instantaneous shock. do.

The embodiments disclosed herein are only presented by selecting the most preferred examples to help those skilled in the art from the various possible examples, the technical spirit of the present invention is not necessarily limited or limited only by this embodiment, the present invention Various changes and modifications are possible within the scope without departing from the spirit of the invention, as well as other embodiments that are equally clear.

As described above, the bridge device having a double buffer structure according to the present invention is applicable to both small, medium, and long bridges regardless of the shape of the upper structure (top plate) is excellent in versatility, especially long displacement Equipped with a permissible shock transmitter, it absorbs thermal deformation and vibration in the longitudinal direction, so that sufficient shock absorption is possible even in the large stretch amount of the long bridge. In addition, the shape and structure is simple and the height of the product is lower than that of the existing product, which is suitable for the maintenance of the existing bridge in which the conventional bridge device is installed. Furthermore, there is an effect of ensuring the seismic safety of the existing bridge by replacing only the bridge device without the seismic reinforcement of the structure of the existing bridge is not seismic design. In addition, since the device has a small acupressure area, it is not necessary to secure a large pore distance, making it easy to install. In particular, the present arrangement device has the advantage that the double shock absorbing structure to compensate for the heat displacement of the bridge top plate and at the same time can quickly cope with the sudden shock force such as earthquake through the shock absorbing member. In particular, the shock transmitting device allows for constant displacement and plays a rigid role during an earthquake, so the shock absorbing member may be small. In addition, the stiffness of the cushioning member and the compression stiffness in the perpendicular direction of the axial shaft can be different, so it is easy to design according to the impact amount, and the cushioning member is fastened by bolts and nuts from the outside to fix the cushioning member and reduce the performance. There is also an advantage that can be replaced.

Claims (14)

In the bridge device is installed on the bridge pier to support the load of the top plate and to buffer the force acting between the bridge and the top plate, A lower plate fixed on the pier; A movable body fixedly movable on the lower plate; At least one impact transmitter connecting the movable body and the lower plate and buffering an impact acting in a bridge length direction between the bridge and the upper plate; A top plate movably mounted on the moving body and having a rectangular guide frame body surrounding the moving body at a bottom thereof; And Is provided between the guide frame of the upper plate and the side of the movable body is a bridge device having a double buffer structure including a shock absorbing member for absorbing the impact in all directions acting between the pier and the upper plate. According to claim 1, wherein the impact transmitter is mounted on the side of the moving body and filled with a silicon putty therein, a piston rod protruding from the inside of the cylinder is fixed to the lower plate, and located inside the cylinder Double buffer structure, characterized in that fixed to a predetermined portion of the piston rod partitions the inner space of the cylinder into two spaces and the orifice is perforated so that the silicon putty flows between the partitioned two spaces The device having a. According to claim 2, wherein the movable body is mounted on the lower plate and the lower plate and the cylinder of the impact transmitter is fixed, the lower plate is mounted on the upper portion of the lower plate and the shock absorbing member is disposed on the upper surface while the And a buffer disk interposed between the upper plate and the upper plate and the lower plate to absorb upper and lower vibrations of the bridge. 4. The shock absorbing member of claim 3, wherein the shock absorbing member is provided with a mount on the shaft center, and the mount enters a predetermined portion into a support hole formed in the upper movable plate while the inner end thereof is in close contact with the upper movable plate. It is fixed to move while the outer end is a chair device having a double buffer structure, characterized in that the tightly regulated on the inner surface of the guide frame body. 4. The shock absorbing member according to claim 3, wherein the shock absorbing member is movably fixed in the axial direction through a mounting hole formed in the guide frame in a state where a mount is provided on the shaft center and the inner end thereof is in close contact with the guide frame. On the other hand, the outer end is a chair device having a double buffer structure, characterized in that tightly regulated on the outer surface of the upper movable plate. According to claim 2, wherein the movable body is mounted on the lower plate and the cylinder of the impact transmitter is fixed and the lower movable plate having a lower seating portion on the upper portion, and the upper seating portion seated on the lower seating portion of the lower movable plate It is provided on the side and the shock absorbing member is disposed on the upper surface of the upper plate is mounted between the upper plate and the upper seating portion of the upper plate and the lower seating portion of the lower plate to absorb the vertical vibration of the bridge A bridge device having a double buffer structure, characterized in that it comprises a buffer disk. The fluororesin contact plate and the sliding plate of stainless steel are attached to the upper surface of the upper movable plate and the lower surface of the upper plate corresponding thereto, respectively. A device having a double buffer structure. According to claim 3 or 6, wherein the upper surface portion of the lower plate and the bottom portion of the lower movable plate corresponding to the straight guide groove in parallel to the longitudinal direction of the impact transmitter on one side and the corresponding portion There is a guide device having a double buffer structure, characterized in that the guide projection is inserted into the guide groove. 9. The double buffer according to claim 8, wherein a sliding plate of stainless steel and a contact plate of fluorine resin having a small coefficient of friction are attached to the corresponding surface portion of the lower plate and the lower movable plate adjacent to the guide groove and the guide protrusion, respectively. Structured device. 7. The double buffer structure according to claim 6, wherein one of the upper seating portion and the lower seating portion protrudes into a cylindrical shape, and the other side of the upper seating portion and the lower seating portion is a cylindrical recessed groove accommodating the cylindrical shape. Having a teaching device. 11. The method of claim 10, wherein the buffer member is provided with a mount on the shaft center and the fixed end is entered and fixed to the inside of the support hole formed in the upper movable plate while the inner end is in close contact with the upper movable plate while The outer end is a bridge device having a double buffer structure, characterized in that the tight contact with the inner surface of the guide frame body. 11. The shock absorbing member of claim 10, wherein the shock absorbing member is movably fixed in the axial direction through a mounting hole formed in the guide frame in a state where a mount is provided on the shaft center and the inner end thereof is in close contact with the guide frame body. On the other hand, the outer end is a chair device having a double buffer structure, characterized in that tightly regulated on the outer surface of the upper movable plate. 12. The fluororesin contact plate and the sliding plate of stainless steel are attached to the outer end of the buffer member and the inner surface of the guide frame which are in close contact therewith, respectively. A device having a double buffer structure. The fluororesin contact plate and the sliding plate of stainless steel are attached to the outer end of the buffer member and the outer surface of the upper movable plate in close contact with the buffer member. The device having a double buffer structure.