CN204266130U - Two rope composite damping rope - Google Patents

Abstract

The utility model discloses a double-cable composite damping cable, which comprises a main cable, an auxiliary cable, a first support, a second support and a viscous damper, and the first support and the second support are installed on the ground One end of the main cable is connected to the main girder of the bridge, the other end is connected to one end of the viscous damper, the other end of the viscous damper is connected to the first support, the auxiliary cable is located above the main cable, and the auxiliary cable The two ends of the cable are respectively connected to the main girder of the bridge and the second support, and the main cable and the auxiliary cable are connected by multiple vertical suspenders. The utility model adopts the combination of the main cable and the auxiliary cable, which basically eliminates the sag of the main cable. When the structure has a large vibration, the longitudinal (axial) rigidity of the main cable is small due to the small sag, and its cable force changes significantly; Due to the large sag of the auxiliary cable, the longitudinal stiffness is small, and the change of the cable force is small, which provides conditions for the energy dissipation of the horizontal long-distance installed damper.

Description

Double cable composite damping cable

technical field

The utility model relates to a damping cable, in particular to a double-cable composite damping cable.

Background technique

Viscous dampers are widely used in structural wind and earthquake resistance because of their advantages such as strong energy dissipation capacity, reliable operation, good robustness, convenient installation, and low cost. When the viscous damper performs energy dissipation and vibration reduction on structural vibration, it needs to be installed at a point near the structure that has relative motion with the structure, and the piston rod of the damper is driven to reciprocate relative to the cylinder through the relative motion between the structure and the point. The movement dissipates energy, thereby reducing the vibration of the structure.

Under the action of earthquake or wind, super high-rise buildings will experience relatively large lateral vibration (or vibration). The existing vibration reduction technology uses Tune mass damper (TMD) for vibration reduction, but its mass is large, It needs to occupy several layers of space in the structure, and the cost is high. When the earthquake comes, due to the short duration, TMD may not start in time. Especially for long-span bridges with cantilever construction, the large cantilever stage before the bridge is closed will undergo large vertical and lateral swings under the action of strong winds, which will bring great hidden dangers to the safety of structures and personnel. At present, the vertical boom is generally used to control the vertical vibration, and the TMD is used to control the lateral vibration. If oblique cables are used to control the lateral vibration of the bridge, the cables will have a large sag under the action of gravity (the maximum distance between the two ends of the cables connected by a straight line and the arc formed by the straight line and the cable to the straight line). The sag reduces the axial stiffness of the cable, thereby reducing the cable's restraining effect on the structure's sway. To reduce the effect of sag, greater cable forces are required, but this can lead to excessive deformation of the unclosed bridge. It is precisely because of the influence of the sag of the cable that if the viscous damper is directly connected to the cable, the vibration of the structure will not change the force of the cable, and the damper will not be able to work, resulting in the inability to consume energy and reduce the vibration of the structure. The auxiliary cable series damper technology used in existing cable-stayed bridge cable vibration reduction is because the distance between the cables is small, and the auxiliary cables are installed close to the vertical, the sag of the auxiliary cables is very small, and this method cannot be applied Vibration reduction is realized by utilizing the distance between two structures.

Contents of the invention

In order to solve the above technical problems, the utility model provides a double-cable composite damping cable with low cost and good damping effect.

The technical solution of the utility model to solve the above problems is: a double-cable composite damping cable, including a main cable, an auxiliary cable, a first support, a second support and a viscous damper, the first support, the second The supports are all installed on the ground, one end of the main cable is connected to the main girder of the bridge, the other end is connected to one end of the viscous damper, the other end of the viscous damper is connected to the first support, and the auxiliary cable is located at Above the main cable, the two ends of the auxiliary cable are respectively connected to the main girder of the bridge and the second support, and the main cable and the auxiliary cable are connected by multiple vertical suspenders.

In the above-mentioned double-cable composite damping cable, the main cable and the auxiliary cable are located in the same plane, the main cable is straight, and the auxiliary cable is curved gradually away from the main cable from the middle to both sides.

In the above double-cable composite damping cable, the viscous damper includes an upper beam, a lower beam, a damper cylinder, a piston rod, a pull rod and a piston, the upper beam and the lower beam are arranged in parallel, and the damper cylinder is fixedly installed on the lower beam. The middle part of the upper surface of the beam, the upper end of the piston rod passes through the upper beam and is fixed on the upper beam, the top end of the piston rod is connected with the main cable through a hinge, and the lower end of the piston rod is installed in the damper cylinder. Set on the lower end of the piston rod, the damper cylinder is provided with damping oil, the two sides of the damper cylinder are respectively provided with springs, and the two ends of the spring are respectively fixed on the upper beam and the lower beam, and one end of the tie rod It is hinged on the lower surface of the lower beam, and the other end is connected with the first support.

The beneficial effects of the utility model are:

1. The utility model adopts the combination of the main cable and the auxiliary cable, which basically eliminates the sag of the main cable. When the structure has a large vibration, the longitudinal (axial) stiffness of the main cable is small due to the small sag, and its cable force changes. Obviously, the main cable only needs a small pre-tension force to have a large axial stiffness; the auxiliary cable has a small longitudinal stiffness due to its large sag, and its cable force changes very little, which is a good solution for the horizontal and long-distance installed damper. conditions can be provided;

2. The pulling force of the overall structure of the utility model is mainly borne by the auxiliary cable, and the sag of the auxiliary cable can be arbitrarily increased according to the actual situation, thereby reducing the pulling force of the auxiliary cable and reducing the additional force of the vibration damping system on the structure;

3. When the tension of the main cable changes periodically, it works together with the spring to drive the viscous damper piston and the cylinder to move relative to each other to consume energy, without the need for the main cable to provide thrust;

4. The viscous damper is combined with the main and auxiliary cables to realize the installation of the viscous damper between two points with a long horizontal distance, and has the same energy consumption and vibration reduction effect as when it is installed between two points that are very close to each other.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic structural diagram of the viscous damper in Fig. 1 .

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

As shown in Figure 1, the utility model includes auxiliary cable 2, boom 3, main cable 4, viscous damper 5, first support 6-1 and second support 6-2, the first support 6-1. The second supports 6-2 are all installed on the ground. One end of the main cable 4 is connected to the main girder 1 of the bridge, and the other end is connected to one end of the viscous damper 5. The other end of the viscous damper 5 One end is connected to the first support 6-1, the auxiliary cable 2 is located above the main cable 4, the main cable 4 and the auxiliary cable 2 are located in the same plane, the main cable 4 is straight, and the auxiliary cable 2 is in the shape of a curve (naturally formed by gravity) gradually away from the main cable 4 from the middle to both sides. The cables 2 are connected by a plurality of vertical suspension rods 3 .

As shown in Figure 2, the viscous damper 5 includes an upper beam 8, a piston rod 9, a damper cylinder 10, a piston 11, damping oil 12, a spring 13, a lower beam 14 and a pull rod 15, and the upper beam 8 Set parallel to the lower beam 14, the damper cylinder 10 is fixedly installed in the middle of the upper surface of the lower beam 14, the upper end of the piston rod 9 passes through the upper beam 8 and is fixed on the upper beam 8, and the top end of the piston rod 9 passes through the hinge 7 Linked with the main cable 4, the lower end of the piston rod 9 is passed through the damper cylinder 10, and the piston is sheathed on the lower end of the piston rod 9. The damper cylinder 10 is provided with damping oil 12, and the damper cylinder Body 10 both sides are respectively provided with spring 13, and the two ends of spring 13 are respectively fixed on the upper beam 8 and the lower beam 14, and one end of said pull rod 15 is hinged on the lower surface of the lower beam 14, and the other end is connected with the first support 6 -1 connection.

The working principle of the utility model is as follows: the main cable 4 is straight, the auxiliary cable 2 is curved, wherein the auxiliary cable 2 bears all the gravity of the two cables, and ensures that the points connecting the main cable 4 and the boom 3 are on the same straight line , because the sag of auxiliary cable 2 is large (can be arbitrarily set according to the situation), its cable force is just small. When there are enough suspenders 3, and a certain tension is added to the series system of the main cable 4 and the viscous damper 5, so that it is in the initial tension state, the main cable 4 is approximately a straight line, and its axial stiffness is large . When the structure moves to the left due to lateral vibration, the distance between the two anchor points of the main cable 4 increases, causing the main cable 4 and the spring 13 to be further stretched. Since the stiffness of the main cable 4 is much greater than that of the spring 13, the deformation is mainly caused by the spring 13. bear, while stretching the viscous damper 5 dissipates energy. When the structure moves to the right due to lateral vibration, the distance between the two anchor points of the main cable 4 decreases, resulting in a decrease in the tension between the main cable 4 and the spring 13. Since the stiffness of the main cable 4 is much greater than that of the spring 13, the deformation is mainly borne by the spring 13 , the spring 13 compresses the viscous damper 5 to dissipate energy. During the left-right vibration of the structure, the tension of the auxiliary cable 2 basically does not change due to the large sag, and its influence on the structural vibration and the deformation of the main cable can be ignored.

Claims (3)

1. a two rope composite damping rope, it is characterized in that: comprise main rope, secondary rope, the first bearing, the second bearing and viscous damper, described first bearing, the second bearing are installed on ground, one end of described main rope is connected with bridge main beam, the other end is connected with one end of viscous damper, the other end of viscous damper is connected with the first bearing, described secondary rope is positioned at the top of main rope, the two ends of secondary rope connect bridge main beam and the second bearing respectively, are connected between main rope and secondary rope by many vertical suspension rods.

2. two rope composite damping rope as claimed in claim 1, is characterized in that: described main rope and secondary rope are positioned at same plane, and described main rope is linearly, and described secondary rope is by the curve-like of centre to both sides gradually away from main rope.

3. two rope composite damping rope as claimed in claim 2, it is characterized in that: described viscous damper comprises top rail, lower transverse beam, damper cylinder body, piston rod, pull bar and piston, described top rail and lower transverse beam be arranged in parallel, damper cylinder body is fixedly mounted on the middle part of lower transverse beam upper surface, the upper end of described piston rod is passed top rail and is fixed on top rail, the top of piston rod is connected with main rope by hinge, the lower end of piston rod is arranged in damper cylinder body, described piston bush is located at the lower end of piston rod, damping oil is provided with in described damper cylinder body, damper cylinder body both sides are respectively equipped with spring, the two ends of spring are separately fixed on top rail and lower transverse beam, one end of described pull bar is hinged on the soffit of lower transverse beam, the other end is connected with the first bearing.