CN110952433A

CN110952433A - TMD vibration reduction frame for pin-connected sling

Info

Publication number: CN110952433A
Application number: CN202010032338.0A
Authority: CN
Inventors: 王希东; 李胜利; 高无迪; 郭攀; 李攀杰
Original assignee: Zhengzhou University
Current assignee: Zhengzhou University
Priority date: 2020-01-13
Filing date: 2020-01-13
Publication date: 2020-04-03

Abstract

The invention relates to a TMD vibration reduction frame for a pin-connected sling, which effectively solves the technical problems that the existing suspension bridge has poor vibration reduction applicability, a damper cannot achieve an ideal effect and the installation is limited, and comprises a mass block, a spring, an oil damper and a vibration reduction frame, wherein the vibration reduction frame comprises two symmetrical cable clamps, the two cable clamps are connected through a steel column, the mass block capable of moving left and right is sleeved on the steel column, and one end of the mass block is connected with the cable clamps through the spring and the oil damper respectively.

Description

TMD vibration reduction frame for pin-connected sling

Technical Field

The invention belongs to the technical field of damping of suspension bridge slings, and particularly relates to a TMD damping frame for a pin-jointed sling.

Background

Along with the development of economy in China, the demand for transportation is increasing day by day, a plurality of suspension bridges and cable-stayed bridges appear, the development of social economy is promoted, meanwhile, problems also appear in the suspension bridges, the suspension ropes of a plurality of suspension bridges have vibration phenomena, not only are the bridge structures affected, but also the safety of the bridges is often damaged in the vibration process of the suspension ropes, and news about the damage of the suspension bridges to the suspension ropes is reported in many places. Therefore, it is necessary to suppress the vibration phenomenon of the suspension cable of the suspension bridge.

After inspection, patents related to TMD-vibration reduction frame devices for pin-jointed slings and patents related to sling vibration reduction are not found, most of the patents are that dampers are installed at positions close to bridge deck cables, the method is not strong in vibration reduction applicability to the slings of suspension bridges, the common damper devices cannot achieve ideal effects, and the common damper devices are easily limited by installation positions and the like and difficult to maintain.

The invention provides a novel sling damping frame which can avoid the problems.

Disclosure of Invention

Aiming at the situation, in order to overcome the defects of the prior art, the invention provides the TMD vibration attenuation frame for the pin-connected sling, and the technical problems that the existing suspension bridge is low in vibration attenuation applicability, the damper cannot achieve an ideal effect and installation is limited are effectively solved.

A TMD vibration reduction frame for a pin-connected sling is characterized by comprising a mass block, a spring, an oil damper and a vibration reduction frame, wherein the vibration reduction frame comprises two symmetrical cable clamps, the middles of the two cable clamps are connected through a steel column, the mass block capable of moving left and right is sleeved on the steel column, and one end of the mass block is connected with the cable clamps through the spring and the oil damper respectively.

Preferably, the two cable clamps are connected with the steel column in a welding mode.

Preferably, two ends of the mass block penetrate through the inner part to form a cavity.

Preferably, the upper end and the lower end of one end of the mass block are both provided with a first screw hole, one end of the cable clamp corresponding to the first screw hole is provided with a second screw hole, the first screw hole and the second screw hole at the upper end are elastically connected through an oil damper, and the first screw hole and the second screw hole at the lower end are connected through a spring.

Preferably, both ends of the spring are spiral, one end of the spring is fixed in the second screw hole through a bolt, and the other end of the spring is fixed in the first screw hole.

Preferably, the two ends of the oil damper are connected with second springs, the ends of the second springs are spiral, one ends of the second springs are fixed in the second screw holes through bolts, and the other ends of the second springs are fixed in the first screw holes.

Compared with the prior art, the invention has the following beneficial effects:

1. the device can be used for reducing the vibration of the sling and prolonging the service life of the sling, and has the advantages of convenient assembly, convenient transportation, simple operation, good economy, strong applicability and strong practicability.

2. The invention can be used for controlling the wind-induced vibration of the pin-jointed sling of the suspension bridge, reducing the wind vibration response of the sling, effectively preventing the fatigue damage of the sling and prolonging the service life of the sling.

Drawings

FIG. 1 is a schematic front view of a TMD damping frame device of the pin-jointed sling of the present invention.

FIG. 2 is a schematic side view of a TMD damping frame assembly of the pinned sling of the present invention.

FIG. 3 is a schematic view of a damping frame and TMD of the present invention.

FIG. 4 is a schematic diagram of the connection between the TMD and the cable clamp of the present invention.

FIG. 5 is a diagram of a quality block A-A in TMD of the present invention.

FIG. 6 is a schematic view of an oil damper in a TMD of the present invention.

1: a mass block; 2: a spring; 3: an oil damper; 4: a steel column; 5: a cable clamp; 6: sling, 7: a bolt; 8: a second spring; 9: a first screw hole; 10: and a second screw hole.

Detailed Description

The foregoing and other aspects, features and advantages of the invention will be apparent from the following more particular description of embodiments of the invention, as illustrated in the accompanying drawings in which reference is made to figures 1 to 6. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.

Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

The first embodiment of the invention relates to a TMD vibration damping frame for a pin-connected sling, which comprises a mass block 1, a spring 2, an oil damper 3, a vibration damping frame and other structures, wherein the vibration damping frame comprises two cable clamps 5, the two cable clamps 5 are arranged in bilateral symmetry, the cable clamps 5 are in an inward semi-ring shape and are sealed by a connecting plate, the two cable clamps 5 are connected through a steel column 4, the mass block 1 is sleeved on the steel column 4, the mass block 1 can reciprocate on the steel column 4, and one end of the mass block 1 is connected with the cable clamps 5 through the spring 2 and the oil damper 3 respectively.

In the second embodiment, on the basis of the first embodiment, the two cable clamps 5 are connected with the steel column 4 by welding.

In the third embodiment, based on the first embodiment, the mass block 1 is a hollow cylinder.

In the fourth embodiment, on the basis of the first embodiment, the mass block 1 has screw holes, called first screw holes 9, formed at the upper and lower ends thereof, and screw holes, called second screw holes 10, formed at the corresponding side of the cable clamp 5, wherein the first screw holes 9 and the second screw holes 10 at the upper end are elastically connected through the oil damper 3, and the first screw holes 9 and the second screw holes 10 at the lower end are connected through the spring 2.

In the fifth embodiment, in addition to the fourth embodiment, both ends of the spring 2 are formed into a spiral shape, one end thereof is fixed to the second screw hole 10 of the clip by the bolt 7, and the other end thereof is inserted into the first screw hole 9 to be fixed.

Sixth embodiment, on the basis of the fourth embodiment, the two ends of the oil damper 3 are connected to the second spring 8, the end of the second spring 8 is spiral, one end of the second spring is fixed in the second screw hole 10 of the cable clamp 5 by the bolt 7, and the other end of the second spring is inserted into the first screw hole 9 for fixing.

The mass block 1 is a hollow cylinder and is sleeved on a steel column 4 in the middle, is connected with the vibration reduction frame through a spring 2 and an oil damper 3, and can horizontally reciprocate along the steel column 4 in the middle to further control wind-induced vibration of the sling.

A screw hole is respectively reserved at the upper part and the lower part of one side of the hollow cylinder, so that the spring 2 and the oil damper 3 can be conveniently connected, and good connection performance is ensured.

The two ends of the spring 2 and the oil damper 3 are both in spiral shapes and are respectively connected with the cable clamp 5 and the mass block 1, so that good connection performance is guaranteed, and the rigidity and the size of the spring 2 are determined according to the actual condition of the actual sling.

When the sling vibrates, the mass block 1 can horizontally reciprocate along the middle steel column 4 under the action of the spring 2 and the oil damper 3, and a TMD system consisting of the mass block 1, the spring 2 and the oil damper 3 can provide large additional damping, so that the vibration of the sling is inhibited, and the sling is prevented from being damaged by fatigue.

The oil damper 3 may provide additional damping to the structure.

The vibration damping frame comprises two cable clamps 5 and steel columns welded in the middle of the steel columns, installation positions are provided for the springs 2, the oil dampers 3 and the mass blocks 1, the cable clamps 5 are fixed on the suspension cables 6 through bolts 7, the middle steel columns 4 are welded on the cable clamps 5 and can swing flexibly, and the middle positions of the cable clamps 5 are provided with screw holes respectively for connecting the oil dampers 3 and the springs 2.

When the sling vibrates, the mass block 1 moves left and right along the middle welding steel column 4 under the action of the spring 2 and the oil damper 3, and the whole TMD system can provide large additional damping for the structure, so that the vibration of the sling is effectively inhibited.

The TMD damping frame device can be arranged at any position of the sling and can be arranged at the best position according to the actual condition so as to realize the best damping effect.

The oil damper 3 is the prior art, and the invention provides a structural schematic diagram of the oil damper.

Claims

1. The TMD vibration reduction frame for the pin-connected sling is characterized by comprising a mass block (1), a spring (2), an oil damper (3) and a vibration reduction frame, wherein the vibration reduction frame comprises two symmetrical cable clamps (5), the two cable clamps (5) are connected through a steel column (4), the mass block (1) capable of moving left and right is sleeved on the steel column (4), and one end of the mass block (1) is connected with the cable clamps (5) through the spring (2) and the oil damper (3) respectively.

2. TMD damping frame for pinned slings according to claim 1, wherein two of said clips (5) are welded to the steel columns (4).

3. TMD damping frame for pinned slings according to claim 1, wherein the mass (1) has two ends with a hollow through interior.

4. The TMD damping frame for the pin-jointed sling according to claim 1, wherein the mass block (1) has first screw holes (9) formed at both upper and lower ends thereof, a second screw hole (10) formed at one end of the cable clamp (5) corresponding to the first screw holes (9), the first screw holes (9) and the second screw holes (10) at the upper end thereof are elastically connected through the oil damper (3), and the first screw holes (9) and the second screw holes (10) at the lower end thereof are connected through the spring (2).

5. TMD shock mount for pinned suspension cables as claimed in claim 4 characterized by that the spring (2) is helical at both ends, where one end is fixed in the second screw hole (10) with bolt (7) and the other end is fixed in the first screw hole (9).

6. TMD shock mount for pinned suspension cables according to claim 4 characterized by that the oil damper (3) is connected with a second spring (8) at both ends, the second spring (8) has a spiral end, one end is fixed in the second screw hole (10) by bolt (7) and the other end is fixed in the first screw hole (9).