CN115370861A - Cable-stayed pipe bridge anti-seismic device and anti-seismic method - Google Patents

Abstract

The invention belongs to the technical field of vibration reduction, and in particular relates to an anti-seismic device and an anti-seismic method for a cable-stayed tubular bridge, which includes a cable-stayed cable shock absorber, and the cable-stayed cable shock absorber includes a pull ring, a driver shell and a piezoelectric variable friction damping unit; The top of the drive housing is covered with a drive arc cover; the piezoelectric variable friction damping unit is placed on the inner bottom of the drive shell and is slidably connected with the drive arc cover; the pull ring is placed outside the drive shell; one end of the pull ring is connected to the cable-stayed pipe bridge connection; the other end of the pull ring is connected to the piezoelectric variable friction damping unit; the axial direction of the pull ring is perpendicular to the axial direction of the piezoelectric variable friction damping unit. The invention realizes the anti-seismic effect through piezoelectric friction, can realize fast and precise adjustment of frictional force, and has strong shock-absorbing and buffering effects.

Description

Anti-seismic device and anti-seismic method for cable-stayed tubular bridge

technical field

The invention belongs to the technical field of anti-seismic devices, and relates to an anti-seismic device and an anti-seismic method of a cable-stayed tubular bridge.

Background technique

Oil and gas transmission pipeline engineering is an important part of the country's lifeline and occupies a very important position in the national economy; with the increasing demand for petrochemical energy in modern industry, the scale of oil and gas transmission pipeline engineering is also expanding and increasing. It is one of the common ways to use the spanning structure to realize the air spanning of the oil and gas pipeline. The main stress member of the cable-stayed tubular bridge is the cable. Most of the gravity of the bridge and the active load of the bridge are transmitted to the steps through the cable. Due to the characteristics of small mass, small damping and large flexibility of the cable stay, it is very easy to vibrate under the action of wind, wind and rain traffic loads. As the length of the stay cable increases, the vibration amplitude of the stay cable will also increase. Therefore, the stay cable is prone to fatigue fracture and traffic accidents (features and advantages). It is widely used, but when subjected to external When there is strong wind vibration or earthquake in the environment, the structure of the cable-stayed pipe bridge will be seriously damaged, which will affect the safety of the cable-stayed pipe bridge structure. The structure of the cable-stayed pipe bridge will collapse and the oil and gas pipeline will be damaged, which will seriously It threatens the safety of the entire oil and gas transmission pipeline project, so the theoretical research on the seismic design of oil and gas pipelines and pipeline engineering structures is of great significance.

Most of the existing anti-seismic methods are to reduce vibration from the structure to improve the anti-seismic performance of the cable-stayed tubular bridge structure. However, the existing dampers have the following problems: the damping and buffering force cannot be adjusted, which affects the actual adjustment and use; the damping and buffering effect is poor, and the safety of the oil and gas transmission pipeline cannot be guaranteed.

Contents of the invention

In order to solve the technical problems of non-adjustable buffer force and poor vibration damping and buffering effect in the cable-stayed bridge vibration damping device in the prior art, the present invention provides an anti-seismic device and an anti-seismic method for a cable-stayed tubular bridge, which realizes the anti-seismic effect through piezoelectric friction , can realize fast and precise adjustment of friction force, and has strong vibration damping and buffering effect.

In order to achieve the above object, the technical scheme adopted in the present invention is:

An anti-seismic device for a cable-stayed pipe bridge, the anti-seismic device for a cable-stayed pipe bridge includes a pull ring, a driver casing and a piezoelectric variable friction damping unit; the top of the driver casing is covered with a driver arc cover plate; the piezoelectric variable friction The damping unit is placed on the inner bottom surface of the driver casing and is slidably connected with the arc cover of the driver; the pull ring is placed outside the driver casing; one end of the pull ring is connected to the piezoelectric variable friction damping unit; the pull ring is axially and The axial direction of the piezoelectric variable friction damping unit is vertical.

The piezoelectric variable friction damping unit includes an arcuate friction plate, a piezoelectric drive device, and a plane friction plate connected sequentially from top to bottom; the plane friction plate is in contact with the inner bottom surface of the driver housing; the arcuate friction plate is in contact with the driver The curved cover plate is movably connected; the pull ring is connected to the piezoelectric drive device; the axial direction of the pull ring is perpendicular to the axial direction of the piezoelectric drive device.

Further, the piezoelectric driving device includes a driver sleeve and a gasket; a piezoelectric ceramic driver is arranged in the driver sleeve; the upper end of the piezoelectric ceramic driver is in contact with the arc surface friction plate; the lower end of the piezoelectric ceramic driver The gasket is in contact with the plane friction plate; the pull ring is connected with the driver sleeve; the axial direction of the pull ring is perpendicular to the axial direction of the driver sleeve.

Further, the piezoelectric driving device further includes a clamping terminal I arranged between the upper end of the piezoelectric ceramic driver and the arcuate friction plate, and a clamping terminal II provided between the gasket and the flat friction plate.

Further, there are two piezoelectric driving devices, which are symmetrically distributed with respect to the plane friction plate.

Further, the anti-seismic device of the cable-stayed tubular bridge also includes an actuating rod, a limit rod and a limit plate; the actuating rod is located outside the driver casing, the actuating rod is axially the same as the pull ring, and the actuating rod One end of the moving rod is connected to the pull ring, the other end of the moving rod passes through the driver casing and is connected to one of the driver sleeves, the limiting rod and the limiting plate are placed in the driver casing, and the limiting plate is placed The other drive sleeve is outside, and the limit rod passes through the limit plate and is connected with the other drive sleeve; the actuating rod and the limit rod are arranged coaxially.

Further, the anti-seismic device of the cable-stayed tubular bridge also includes a return spring II wound on the actuation rod and a return spring I on the limit rod; the return spring II is located between the actuation rod and the driver sleeve; The return spring I is placed between the limiting plate and the driver sleeve.

A kind of anti-seismic method of described cable-stayed pipe bridge anti-seismic device, comprises the following steps:

1) Determine the vibration point on the cable-stayed tube bridge according to the actual vibration situation;

2) place the anti-seismic device of the cable-stayed tubular bridge at the vibration point, and the pull ring is connected with the stay cables of the cable-stayed tubular bridge;

3) An excitation voltage is applied to the piezoelectric variable friction damping unit, the piezoelectric ceramic driver is deformed, and the piezoelectric variable friction damping unit generates a frictional pretightening force, which produces a damping effect on the stay cable.

Further, in the step 3), the magnitude of the applied excitation voltage and the magnitude of the frictional pre-tightening force have a positive linear change.

Further, in the step 3), the greater the frictional pretightening force generated by the piezoelectric variable frictional damping unit, the stronger the anti-vibration effect.

The beneficial effects of the present invention are:

1. The anti-seismic device of the cable-stayed pipe bridge provided by the present invention installs the anti-seismic device on the cable-stayed cables on both sides of the pipeline through the pull ring, and generates friction pre-tightening force through the piezoelectric inverter effect to prevent the vibration and damping of the cable-stayed cables. The buffer has better energy efficiency and saves resources.

2. The present invention adjusts the positive pressure of the friction surface in real time through the piezoelectric ceramic drivers respectively arranged in the piezoelectric variable friction damping unit, and changes the pretightening force of the friction plate through the change of the positive pressure of the friction surface, thereby changing the friction force, Fast and precise adjustment of the friction force of the damper can be realized.

3. The anti-seismic device of the cable-stayed tubular bridge provided by the present invention can quickly connect the cable-stayed cable with the upper end of the actuating rod through the provided pull ring; Return springs are respectively arranged between the actuating rod and the driver sleeve and the limit rod and the driver sleeve, so that the anti-seismic device can realize a self-resetting function when the power is cut off, which is convenient for the next installation and use.

Description of drawings

Fig. 1 is the sectional view of the front view of the anti-seismic device of the cable-stayed tubular bridge of the present invention;

Fig. 2 is the front view of the cable-stayed tubular bridge anti-seismic device of the present invention;

In the picture:

1—pull ring; 2—actuating rod; 3—limit nut; 4—drive housing; 5—drive arc cover; 6—arc friction plate; 7—top tightening terminal I; 9—connecting rod; 10—limit rod; 11—limit plate; 12—return spring I; 13—drive sleeve; 14—piezoelectric ceramic driver; 15—gasket; 16—top tight terminal II; 17— Plane friction plate; 18—return spring II.

Detailed ways

The following will clearly and completely describe the technical solutions in conjunction with the accompanying drawings of the present invention. Apparently, the described implementations are only part of the implementations of the present invention, not all of them.

In describing the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", " The orientation or positional relationship indicated by "outside" and so on is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention clearly, rather than indicating or implying that the referred device or element must have a specific orientation, with a specific Therefore, it cannot be understood as a limitation on the technical solution of the present invention.

The anti-seismic device of the cable-stayed pipe bridge provided by the invention is mainly used for wind resistance and earthquake resistance of the oil gas pipeline-cable-stayed pipe bridge structural system. The invention uses the inverse piezoelectric effect of piezoelectric ceramics to convert electrical signals into mechanical signals, and changes the pre-tightening force of the friction plate through the change of the positive pressure on the friction surface, thereby changing the friction force and realizing fast and accurate adjustment of the damping buffer force. The energy efficiency of the damping buffer is better, the anti-seismic effect is good, the anti-seismic strength is improved, and resources are saved.

Example

Referring to Figures 1 and 2, a cable-stayed tubular bridge anti-seismic device includes a pull ring 1, a driver housing 4 and a piezoelectric variable friction damping unit; the top of the driver housing 4 is covered with a driver arc cover plate 5; the piezoelectric variable friction damping unit Placed on the inner bottom surface of the driver casing 4 and slidingly connected with the arc cover plate 5 of the driver; the pull ring 1 is placed outside the driver casing 4; one end of the pull ring 1 is connected to the cable-stayed tube bridge; the other end of the pull ring 1 is connected to the piezoelectric variable friction The damping unit is connected; the axial direction of the pull ring 1 is perpendicular to the axial direction of the piezoelectric variable friction damping unit.

The piezoelectric variable friction damping unit includes an arcuate friction plate 6 connected sequentially from top to bottom, a piezoelectric driving device, and a plane friction plate 17; the plane friction plate 17 is in contact with the inner bottom surface of the driver housing 4; The cover plate 5 is movably connected; the pull ring 1 is connected with the piezoelectric driving device; the axial direction of the pull ring 1 is perpendicular to the axial direction of the piezoelectric driving device.

The piezoelectric driving device includes a driver sleeve 13 and a gasket 15; a piezoelectric ceramic driver 14 is arranged in the driver sleeve 13; the upper end of the piezoelectric ceramic driver 14 is in contact with the arc surface friction plate 6; It is in contact with the plane friction plate 17; the pull ring 1 is connected with the driver sleeve 13; the axial direction of the pull ring 1 is perpendicular to the axial direction of the driver sleeve 13.

The piezoelectric driving device also includes a tightening terminal I7 arranged between the upper end of the piezoelectric ceramic driver 14 and the arcuate friction plate 6 and a tightening terminal II16 arranged between the gasket 15 and the flat friction plate 17 .

There are two piezoelectric driving devices, symmetrically distributed with respect to the plane friction plate 17 .

The anti-seismic device of the cable-stayed tubular bridge also includes an actuating rod 2, a limiting rod 10 and a limiting plate 11; Pass through the side wall of the driver housing 4 and connect with one of the driver sleeves 13, the limit rod 10 and the limit plate 11 are placed in the driver housing 4, the limit plate 11 is placed outside the other driver sleeve 13, and the limit The rod 10 passes through the limiting plate 11 and is connected to another driver sleeve 13; the actuating rod 2 and the limiting rod 10 are arranged coaxially.

The anti-seismic device of the cable-stayed tubular bridge also includes a return spring II18 wound on the actuating rod 2 and a return spring I12 on the limit rod 10; the return spring II18 is located between the actuating rod 2 and the driver sleeve 13; the return spring I12 Placed between the limiting plate 11 and the driver sleeve 13 .

Specifically, the driver housing 4 is a rectangular box with a driver arc cover 5 on the top, the driver housing 4 and the driver arc cover 5 are fixedly connected by pre-tightening bolts 8, and a plane friction plate 17 is arranged on the ground inside the driver housing 4 , two parallel driver sleeves 13 are placed on the plane friction plate 17, the piezoelectric ceramic driver 14 is placed in the middle of the two driver sleeves 13, and the upper end of the piezoelectric ceramic driver 14 is connected to the arc surface friction plate through the tight terminal I7 6 contact connection, the top tight terminal I7 is a spherical body, the spherical end is in contact with the arc surface friction plate 6, the lower end of the piezoelectric ceramic driver 14 is in contact with the flat friction plate 17 through the gasket 15, the top tight terminal II16 is in contact with the flat friction plate 17, the top tight terminal The upper end surface of II16 is an arc surface, the arc surface is in contact with the gasket 15, the arc surface friction plate 6 is in sliding contact with the driver arc surface cover plate 5, the lower end surface of the driver arc surface cover plate 5 is in contact with the upper end surface of the arc surface friction plate 6 All are set as arc structure.

One end of the actuating rod 2 penetrates from the left side of the driver housing 4 and is fixedly connected with the driver sleeve 13 on the left side of the plane friction plate 17 through threads. 4 is in contact with the inner wall, and the other end is in contact with the outer wall of the driver sleeve 13; the other end of the actuating rod 2 is placed outside the driver casing 4 and connected with the pull ring 1, the axial direction of the actuating rod 2 is perpendicular to the axial direction of the driver sleeve 13, and the actuation The rod 2 is connected with the driver housing 4 through the limit nut 3, and acts as a limit connection to the actuating rod 2, so that the actuating rod 2 remains horizontal; Limiting rod 10, the right outer side of the driver sleeve 13 on the right is provided with a limiting plate 11, the limiting plate 11 is connected with the plane friction plate 17 and the arc friction plate 6, the left end of the limiting rod 10 is threaded with the driver sleeve 13 Fixed connection, the right end of the limit rod 10 extends rightward through the limit plate 11 and is placed inside the driver housing 4, the left end of the return spring I12 is in contact with the side wall of the driver sleeve 13 on the right, and the right end of the return spring I12 is in contact with the left end of the limit plate 11 sidewall contact.

The connecting rod 9 is arranged on the right side of the driver housing 4, and the connecting rod 9 is located outside the driver housing 4, and is fixedly connected with the driver housing 4 by a nut, and the actuating rod 2, the limit rod 10 and the connecting rod 9 are arranged coaxially. The effect of connecting rod 9 is when the driver casing 4 is unstable on the cable-stayed bridge, by connecting rod 9 stabilizing devices.

During implementation, the present invention adopts the inverse piezoelectric effect to generate frictional pretightening force, and the inverse piezoelectric effect means that the ceramic sheet shortens along the polarization direction when a reverse electric field is applied.

The anti-seismic method of the cable-stayed pipe bridge anti-seismic device of the present invention comprises the following steps:

1) Determine the vibration point on the cable-stayed tube bridge according to the actual vibration situation;

2) Place the anti-seismic device of the cable-stayed tubular bridge at the vibration point, and the pull ring 1 is connected with the stay cables of the cable-stayed tubular bridge;

3) A reverse excitation voltage is applied to the piezoelectric variable friction damping unit, the piezoelectric ceramic driver 14 undergoes reverse deformation, and the piezoelectric variable friction damping unit generates a frictional pretightening force, which produces an anti-seismic effect on the stay cable.

In step 3), the magnitude of the applied reverse excitation voltage and the magnitude of the frictional pretightening force have a positive linear change. The greater the friction pretightening force generated by the piezoelectric variable friction damping unit, the stronger the anti-seismic effect.

During implementation, firstly, the points that are prone to vibration should be determined according to the design parameters of the cable-stayed tubular bridge itself, pipeline parameters, transported medium, and surrounding environmental conditions (weather, wind, earthquake, etc.).

Next, place the driver casing 4 on the bridge deck of the cable-stayed tube bridge, connect the pull ring 1 with the cable stay cables, and realize the stable connection between the driver casing 4 and the bridge deck through the connecting rod 9 .

Finally, a reverse excitation voltage is applied to the piezoelectric ceramic driver 14 in the piezoelectric variable friction damping unit, and the piezoelectric ceramic driver 14 is reversely deformed, that is, shrinks in its polarization direction. Since the upper end of the piezoelectric ceramic driver 14 passes through the top The tight terminal I7 is in contact with the arc-surface friction plate 6, and the arc-surface friction plate 6 is in sliding contact with the arc-surface cover plate 5 of the driver. The tops of the two piezoelectric ceramic drivers 14 are both contracted downward, and the arc-surface friction plate 6 produces downward friction. Force, and then drive the arc cover plate 5 of the driver to generate a downward friction pretightening force; the lower end of the piezoelectric ceramic driver 14 is connected to the plane friction plate 17 through the gasket 15, the top tight terminal II16, and the two piezoelectric ceramic drivers The bottom ends of 14 all shrink upwards, and the flat friction plate 17 produces upward compression friction; similarly, the piezoelectric ceramic driver 14 on the left side shrinks to the right, driving the actuating rod 2 to generate a pulling force to the right, and the actuating rod 2 drives The pull ring 1 tightens the stay cable, the piezoelectric ceramic driver 14 on the right side shrinks to the left, drives the limit rod 10 to generate a pulling force to the left, and the limit plate 11 produces a limit to the movement, generates a damping buffer force, and improves the anti-seismic effect .

At the same time, due to the characteristics of piezoelectric ceramics, when a reverse voltage is applied to both ends of piezoelectric ceramics, piezoelectric ceramics will produce reverse deformation, and the size of the deformation is proportional to the applied voltage, that is, the size of the deformation is controlled by the voltage. According to the inverse piezoelectric effect of piezoelectric ceramics, the electrical signal is converted into a mechanical signal, and the pretightening force of the friction plate is changed through the change of the positive pressure on the friction surface, thereby changing the friction force and realizing the real-time adjustment of the positive pressure on the friction surface. Therefore, By controlling the magnitude of the voltage at both ends of the piezoelectric ceramic driver to control the magnitude of the generated frictional force, while having a damping effect on the cable stay, it is possible to quickly and accurately adjust the frictional force of the damper; during implementation, The magnitude of the applied reverse excitation voltage and the magnitude of the friction pre-tightening force have a positive linear change, and the greater the friction pre-tightening force generated by the piezoelectric variable friction damping unit, the stronger the anti-seismic effect.

The anti-seismic device of the cable-stayed pipe bridge of the present invention, through the provided pull ring, the cable-stayed cable and the upper end of the actuating rod are quickly connected together, and then the limit nut 3 is used to realize the limited connection between the driver shell and the actuating rod , the pre-tightening force is generated through piezoelectric friction, and the stay cable is tightened, so that the energy efficiency of damping and buffering is better, which is convenient for practical use and saves resources; at the same time, between the actuating rod and the driver sleeve, as well as between the limit rod and the driver sleeve All are equipped with return springs, so that when the anti-seismic device of the cable-stayed tube bridge is powered off, the self-resetting function can be realized, which is convenient for the next installation and use.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in this application, according to the technical solution of the present invention Equivalent replacements or changes to the concepts thereof shall fall within the protection scope of the present invention.

Claims (10)

1. The cable-stayed pipe bridge anti-seismic device is characterized by comprising a pull ring (1), a driver shell (4) and a piezoelectric variable friction damping unit; the top of the driver shell (4) is covered with a driver cambered surface cover plate (5); the piezoelectric variable friction damping unit is arranged on the inner bottom surface of the driver shell (4) and is in sliding connection with the driver cambered surface cover plate (5); the pull ring (1) is arranged outside the driver shell (4); one end of the pull ring (1) is connected with the piezoelectric variable friction damping unit; the axial direction of the pull ring (1) is vertical to the axial direction of the piezoelectric variable friction damping unit.

2. The cable-stayed pipe bridge anti-seismic device according to claim 1, wherein the piezoelectric variable friction damping unit comprises a cambered surface friction plate (6), a piezoelectric driving device and a plane friction plate (17) which are sequentially connected from top to bottom; the plane friction plate (17) is contacted with the inner bottom surface of the driver shell (4); the cambered surface friction plate (6) is movably connected with the driver cambered surface cover plate (5); the pull ring (1) is connected with a piezoelectric driving device; the axial direction of the pull ring (1) is vertical to the axial direction of the piezoelectric driving device.

3. A cable-stayed bridge seismic apparatus according to claim 2, characterized in that the piezoelectric driving means comprises a driver sleeve (13) and a spacer (15); a piezoelectric ceramic driver (14) is arranged in the driver sleeve (13); the upper end of the piezoelectric ceramic driver (14) is contacted with the cambered surface friction plate (6); the lower end of the piezoelectric ceramic driver (14) is contacted with a plane friction plate (17) through a gasket (15); the pull ring (1) is connected with a driver sleeve (13); the pull ring (1) is axially perpendicular to the driver sleeve (13).

4. The cable-stayed pipe bridge anti-seismic device according to claim 3, wherein the piezoelectric driving device further comprises a jacking terminal I (7) arranged between the upper end of the piezoelectric ceramic driver (14) and the cambered friction plate (6) and a jacking terminal II (16) arranged between the gasket (15) and the plane friction plate (17).

5. An anti-seismic device for cable-stayed pipe bridges according to claim 4, characterized in that the number of the piezoelectric driving devices is two and is distributed symmetrically about the plane friction plate (17).

6. The cable-stayed pipe bridge anti-seismic device according to claim 5, wherein the cable-stayed pipe bridge anti-seismic device further comprises an actuating rod (2), a limiting rod (10) and a limiting plate (11); the actuating rod (2) is located outside the driver shell (4), the actuating rod (2) is axially the same as the pull ring (1), one end of the actuating rod (2) is connected with the pull ring (1), the other end of the actuating rod (2) penetrates through the driver shell (4) to be connected with one of the driver sleeves (13), the limiting rod (10) and the limiting plate (11) are both arranged in the driver shell (4), the limiting plate (11) is arranged on the outer side of the other driver sleeve (13), and the limiting rod (10) penetrates through the limiting plate (11) to be connected with the other driver sleeve (13); the actuating rod (2) and the limiting rod (10) are coaxially arranged.

7. The cable-stayed pipe bridge anti-seismic device according to claim 6, characterized by further comprising a return spring II (18) wound on the actuating rod (2) and a return spring I (12) wound on the limiting rod (10) respectively; the return spring II (18) is positioned between the actuating rod (2) and the driver sleeve (13); the return spring I (12) is arranged between the limiting plate (11) and the driver sleeve (13).

8. An anti-seismic method of a cable-stayed pipe bridge anti-seismic device according to claim 7, characterized by comprising the steps of:

1) Determining a vibration point on the cable-stayed pipe bridge according to the actual vibration condition;

2) The cable-stayed pipe bridge anti-seismic device according to claim 7 is arranged at a vibration point, and the pull ring (1) is connected with a stay cable of the cable-stayed pipe bridge;

3) And applying reverse excitation voltage to the piezoelectric variable friction damping unit, so that the piezoelectric ceramic driver (14) is reversely deformed, and the piezoelectric variable friction damping unit generates friction pretightening force to generate an anti-seismic effect on the stay cable.

9. An anti-seismic method according to claim 8, wherein in step 3), the magnitude of the applied reverse excitation voltage and the magnitude of the friction pre-tightening force are in positive linear change.

10. An anti-seismic method according to claim 9, wherein in the step 3), the greater the frictional pre-tightening force generated by the piezoelectric variable friction damping unit, the stronger the anti-seismic effect.

Images