CN111749119A - Velocity Locked Mild Steel Dampers and Long Span Bridges Containing the Dampers - Google Patents

Abstract

The embodiments of the present application disclose a speed-locking mild steel damper and a large-span bridge including the damper, so as to meet the requirements of longitudinal damping of the bridge under different dynamic loads. To this end, the speed-locking mild steel damper provided in one aspect of the embodiments of the present application includes a horizontally arranged speed locker and a damping tenon assembly, the damping tenon assembly including a base, a plurality of damping tenons and a top plate; Each of the shock-absorbing tenons is vertically fixed on the top of the base, and the top of each of the shock-absorbing tenons is fixedly connected with a spherical force-transmitting head, and the spherical-type force-transmitting head is matched with the In the installation cavity at the bottom, the piston rod of the speed lock is fixedly connected with the side of the top plate.

Description

Velocity Locked Mild Steel Dampers and Long Span Bridges Containing the Dampers

technical field

The invention belongs to the technical field of shock absorption, and in particular relates to a speed-locking mild steel damper and a large-span bridge including the damper.

Background technique

At present, the most commonly used longitudinal shock absorbers for long-span bridges are large-tonnage viscous dampers. Although viscous dampers can effectively absorb shocks, large-tonnage viscous dampers are expensive and may fail under heavy loads, making maintenance and replacement extremely complicated. Using the mild steel damper alone, although its ability to resist large earthquakes is remarkable, it cannot achieve energy consumption when it works under the action of small load or temperature due to its characteristics of displacement hysteresis energy consumption only after yielding.

SUMMARY OF THE INVENTION

The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one of the objectives of the embodiments of the present application is to provide a speed-locked mild steel damper that can simultaneously meet the longitudinal damping requirements of the bridge under different dynamic loads, and a large-span bridge including the damper.

To this end, the speed locking mild steel damper provided in one aspect of the embodiments of the present application includes a horizontally arranged speed locker and a damping tenon assembly, wherein the damping tenon assembly includes a base, a plurality of damping tenons and a top plate;

A plurality of the shock-absorbing tenons are vertically fixed on the top of the base, and a spherical force-transmitting head is fixedly connected to the top of each of the shock-absorbing tenons, and the spherical force-transmitting head is matched and installed on the top plate In the installation cavity at the bottom of the speed lock, the piston rod of the speed lock is fixedly connected with the side of the top plate.

In some embodiments, the extension line of the axis of the piston rod passes through the spherical center of the spherical force-transmitting head.

In some embodiments, a plurality of the damping tenons are distributed on the base in an array.

In some embodiments, a plurality of the damping tenons are distributed on the base in a rectangular array.

In some embodiments, the inner wall of the installation cavity is provided with a Teflon coating.

In some embodiments, the side part of the top plate is provided with a first connecting plate, and the side part of the piston rod is hingedly connected with a second connecting plate;

The first connecting plate and the second connecting plate are fastened with bolt assemblies.

In some embodiments, the bottom of the top plate is further provided with a limit stop for preventing the spherical force-transmitting head from coming out of the installation cavity.

Another aspect of the embodiments of the present application provides a large-span bridge comprising the speed-locked mild steel damper of the above-mentioned embodiment, wherein one end of the speed-locker away from the damping tenon assembly is connected to the main beam of the bridge, and the base is connected to the main beam of the bridge. The seat is fixedly arranged on top of the piers of the bridge.

Compared with the prior art, at least one embodiment of the present application has the following beneficial effects:

Under normal working conditions of the bridge, the moving speed of the piston rod is less than the locking speed of the speed lock, and the speed lock can work normally, so that it can move freely under the action of various small loads (such as wind, vehicle load, etc.) and temperature. Restricted, when encountering large loads such as earthquakes, the movement speed of the piston rod will be greater than the locking speed of the speed lock locker, so that the speed locker is locked, which is equivalent to a rigid connecting rod. At this time, the damping tenon assembly begins to Work energy consumption, provide large damping force and large displacement, so as to effectively resist various large dynamic loads, so that the speed-locking mild steel damper can meet the longitudinal shock absorption requirements of bridges under different dynamic loads.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of a bridge comprising a speed-locking mild steel damper provided by an embodiment of the present application;

2 is a schematic side view of a bridge comprising a speed-locking mild steel damper provided by an embodiment of the present application;

FIG. 3 is a partial schematic diagram of the speed-locking mild steel damper provided by the embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Embodiments of the present application provide a speed-locking mild steel damper and a large-span bridge including the damper, so as to meet the longitudinal damping requirements of the bridge under different dynamic loads.

Referring to FIGS. 1-3 , the speed-locking mild steel damper provided in one aspect of the embodiments of the present application includes a horizontally arranged speed locker 1 and a damping tenon assembly 2 . The damping tenon assembly 2 includes a base 201 , a plurality of damping Shock tenon 202 and top plate 203; wherein,

A plurality of damping tenons 202 are vertically fixed on the top of the base 201 , the top of each damping tenon 202 is fixedly connected with a spherical force transmission head 204 , and the spherical force transmission head 204 matches the installation on the bottom of the top plate 203 The piston rod 101 of the speed lock is fixedly connected with the side of the top plate 203 .

In the embodiment of the present application, when the load on the speed lock is small, the movement speed of the piston rod 101 is lower than the locking speed of the speed lock, and the speed lock 1 can work normally, so that under various small loads (such as wind and wind) , vehicle load, etc.) and the free movement under the action of temperature is unrestricted. When encountering large loads such as earthquakes, the movement speed of the piston rod 101 will be greater than the locking speed of the speed lock locker, so that the speed locker 1 is locked. Equivalent to a rigid connecting rod, the force of the piston rod 101 is transmitted from the top plate 203 to the damping tenon through the spherical force-transmitting head 204, and the damping tenon is deformed and starts to consume energy, providing large damping force and large displacement, thereby effectively Resisting various large dynamic loads, the speed-locking mild steel damper can meet the longitudinal damping requirements of bridges under different dynamic loads.

Referring to FIGS. 1-3 , in some possible implementation solutions, the extension line of the axis of the piston rod 101 passes through the spherical center of the spherical force-transmitting head 204 . In the embodiment of the present application, since the centerline of the output force of the piston rod 101 passes through the center of the spherical power transmitting head 204, only horizontal thrust or pulling force is transmitted to the top plate 203, no vertical force is transmitted, and no additional force is transmitted. additional bending moment caused by the arm.

It should be explained that, in the actual design, the plurality of damping tenons are distributed in a rectangular array on the base 201, and of course, they can also be distributed in a circular array.

Specifically, the top of the base 201 is provided with a threaded mounting hole, the bottom of the damping tenon 202 is provided with an external thread adapted to the threaded mounting hole, and the damping tenon 202 is screwed and fixed in the threaded mounting hole. In the embodiment of the present application, the damping tenon 202 is fastened to the base 201 by screws, and the damping tenon 202 is easily replaced.

In some possible implementation solutions, the bottom of the top plate 203 is further provided with a limit stop 5 to prevent the spherical force-transmitting head 204 from coming out of the installation cavity 4. Specifically, the limit stop 5 is welded and fixed at the installation cavity In the stopper groove beside the cavity 4, the limit stopper 5 is not in contact with the spherical power transmission head 204, so there is no force under normal action, and the spherical power transmission head 204 can rotate freely in the installation cavity 4. Under the action of a possible vertical earthquake or other loads that cause vertical relative displacement between the main girder and the bridge pier 11 , the limit block 5 acts as a limit to prevent the spherical force-transmitting head 204 from leaving the installation cavity 4 .

Note: 10 is not the main beam support, but an anchor plate integrated with the speed locker, through which the anchor plate is directly connected to the anchor seat of the main beam, so 10 is a part of the speed locker and cannot be called Bridge support.

It can be understood that the damping tenon can be made of mild steel, because mild steel is a kind of steel with an obvious yield point, and the initial stiffness is relatively large, and the stiffness after yielding is relatively small. Mild steel members are elastic before yielding, and can dissipate energy through hysteresis after yielding.

In practical applications, the inner wall of the installation cavity 4 can be coated with a polytetrafluoroethylene coating 6, so as to achieve the purpose of lowering the frictional force. In addition, the side part of the top plate 203 can be provided with a first connecting plate 7 , the side part of the piston rod 101 can be hingedly connected to a second connecting plate 8 , and the first connecting plate 7 and the second connecting plate 8 are fastened by bolt assemblies 9 .

Referring to FIG. 1 and FIG. 2 , another embodiment of the present application provides a large-span bridge including the speed-locked mild steel damper of the above-mentioned embodiment, the speed-locked mild steel damper is installed on the main beam 10 and the main beam 10 of the bridge along the longitudinal direction of the bridge. Between piers 11.

Specifically, the speed locking mild steel damper includes a horizontally arranged speed lock 1 and a damping tenon assembly 2. The damping tenon assembly 2 includes a base 201, a plurality of damping tenons 202 and a top plate 203; wherein the speed locking One end of the damper 1 away from the damping tenon assembly 2 is hingedly connected to the main beam 10 of the bridge, and the base 201 is fastened and installed on the top of the pier 11 of the bridge by means of bolts 12 .

Specifically, a plurality of damping tenons are vertically fixed on the top of the base 201 , and a spherical force-transmitting head 204 is fixedly connected to the top of each damping tenon. In the installation cavity 4, the piston rod 101 of the speed lock is fixedly connected with the side of the top plate 203, and the bottom of the top plate 203 is also provided with a limit stop 5 to prevent the spherical power transmission head 204 from coming out of the installation cavity 4 .

The large-span bridge provided by the embodiment of the present application including the speed-locked mild steel damper of the above-mentioned embodiment, under normal use, the bridge is subjected to the action of vehicle, wind and temperature loads, and these loads can make the longitudinal occurrence of the main beam of the bridge smaller displacement. At this time, the speed lock 1 works normally and moves freely. At this time, the damping tenon component 2 is subjected to a relatively small force, and has not yet reached its yield point, but is in an elastic state, which is equivalent to the fixed end. Under the action of earthquake, the moving speed of the piston rod 101 is greater than the locking speed, and the speed lock 1 is locked, which is equivalent to a rigid connecting rod, and drives the top plate 203 of the damping tenon assembly 2 to move together through the connecting plate. The top plate 203 is provided with a mounting cavity 4, and the spherical force-transmitting head 204 of the damping tenon is embedded in the mounting cavity 4, so the force and displacement are transmitted from the top plate 203 to the damping tenon through the spherical force-transmitting head 204, and the damping tenon occurs. deformed until yielding. After the damping tenon yields, due to the continuous increase of the bridge displacement, the deformation of the damping tenon is further increased, and the plasticity degree is higher and higher. Because the seismic action is an irregular action, the bridge will have repeated displacements in the opposite direction, which will drive the vibration damping tenon to undergo repeated deformation, resulting in hysteretic energy dissipation.

In some possible implementation solutions, the extension line of the axis of the piston rod 101 passes through the center of the spherical power transmission head 204. In the embodiment of the present application, since the output center line of the piston rod 101 passes through the center of the spherical power transmission head 204, Therefore, only horizontal pushing or pulling force is transmitted to the top plate 203, no vertical force is transmitted, and no additional bending moment is caused due to the additional moment arm.

In some possible implementation solutions, the bottom of the top plate 203 is further provided with a limit stop 5 to prevent the spherical force-transmitting head 204 from coming out of the installation cavity 4. Specifically, the limit stop 5 is welded and fixed at the installation cavity In the stopper groove beside the cavity 4, the limit stopper 5 is not in contact with the spherical power transmission head 204, so there is no force under normal action, and the spherical power transmission head 204 can rotate freely in the installation cavity 4. Under the action of a possible vertical earthquake or other loads that cause vertical relative displacement between the bridge and the pier 11 , the limit block 5 acts as a limit to prevent the spherical force-transmitting head 204 from leaving the installation cavity 4 .

The above-mentioned embodiments are only examples to clearly illustrate the present invention, and are not intended to limit the embodiments. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. Neither need nor can all embodiments be exhaustive here. And the obvious changes or changes derived from this are still within the protection scope of the present invention.

Claims (10)

1. Speed locking mild steel attenuator, its characterized in that: the damping tenon component comprises a base, a plurality of damping tenons and a top plate;

the damping tenons are vertically and fixedly arranged at the top of the base, a spherical force transmission head is fixedly connected to the top end of each damping tenon, the spherical force transmission heads are installed in an installation cavity in the bottom of the top plate in a matched mode, and a piston rod of the speed locker is fixedly connected with the side portion of the top plate.

2. The speed locking mild steel damper according to claim 1, wherein: the extension line of the axis of the piston rod passes through the spherical center of the spherical force transmission head.

3. The speed locking mild steel damper according to claim 1 or 2, characterized in that: the shock absorption tenons are distributed on the base in a rectangular array mode.

4. The speed locking mild steel damper according to claim 3, wherein: the shock absorption tenon is in threaded fastening connection with the base.

5. The speed locking mild steel damper according to claim 1 or 2, characterized in that: and a polytetrafluoroethylene coating is arranged on the inner wall of the mounting cavity.

6. The speed locking mild steel damper according to claim 1 or 2, characterized in that: a first connecting plate is arranged on the side of the top plate, and a second connecting plate is hinged to the side of the piston rod;

the first connecting plate and the second connecting plate are connected through a bolt assembly in a fastening mode.

7. The speed locking mild steel damper according to claim 1 or 2, characterized in that: and the bottom of the top plate is also provided with a limit stop block for preventing the spherical force transmission head from being separated from the mounting cavity.

8. The speed locking mild steel damper according to claim 1 or 2, characterized in that: the damping tenon is made of mild steel.

9. A large span bridge comprising a speed locking mild steel damper according to any one of claims 1 to 8, wherein: one end of the speed locker, which is far away from the damping tenon component, is connected with the main beam of the bridge, and the base is fixedly arranged at the top of the pier of the bridge.

10. The large-span bridge comprising the large-span bridge of claim 9, wherein: the speed locker is hinged to the main beam.

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