Double-end movable multistage winding cable damper

Abstract

The invention relates to the technical field of bridge seismic resistance, and discloses a double-end movable multistage winding cable damper which is longitudinally arranged between a pier and a main beam and comprises a limiting baffle installed at the top end of the pier and connected with the bottom end of the main beam above. The damping assembly comprises a friction shaft and a plurality of damping pieces, the friction shaft is rotationally connected to the limiting baffle, a plurality of winding cables are wound on the friction shaft at equal intervals in the axial direction, hanging lugs are fixedly connected to the two sides of the bottom end of the main beam, and the two ends of each winding cable penetrate through the two sides of the limiting baffle correspondingly; the two limiting baffles are arranged on the winding cable and fixedly connected with the two hanging lugs respectively, the damping pieces are arranged on the winding cable, and when vibration occurs outside, the damping pieces make contact with the outer side walls of the limiting baffles to achieve damping. The earthquake response of the continuous beam bridge is reduced, and the earthquake resistance of the continuous beam bridge is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge earthquake resistance, in particular to a double-end movable multi-stage winding cable damper. Background Art

[0002] During an earthquake, bridges are mainly affected by the horizontal earthquake components in the longitudinal and transverse directions (the longitudinal direction refers to the direction of the bridge's central axis, and the transverse direction refers to the direction perpendicular to the bridge's central axis). Under the action of the transverse component, there are the following safety hazards: the bridge superstructure collides with the lateral blocks on the piers (or abutments), the lateral blocks are damaged, and a transverse beam fall accident occurs. Under the action of a strong earthquake, the piers of traditional continuous beam bridges usually experience large plastic deformations, making the bridge unable to meet the needs of post-earthquake traffic. At present, the above problems are generally solved by setting a shock-absorbing or damping structure at the bottom of the bridge superstructure or the top of the piers and cap beams. The existing damping structure cannot reduce the seismic response of the continuous beam bridge, and its seismic performance is poor.

[0003] Therefore, there is an urgent need for a double-ended movable multi-stage winding cable damper to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a double-ended movable multi-stage winding cable damper to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a double-ended movable multi-stage winding cable damper, which is longitudinally arranged between the pier and the main beam, comprising:

[0006] The limit baffle is installed on the top of the pier and connected to the bottom end of the main beam above;

[0007] The damping assembly includes a friction shaft and a plurality of damping members. The friction shaft is rotatably connected to the limit baffle. A plurality of winding cables are wound around the friction shaft at equal intervals along the axial direction. Both sides of the bottom end of the main beam are fixedly connected with hanging ears. The two ends of the winding cable respectively pass through the two sides of the limit baffle and are fixedly connected to the two hanging ears respectively. The damping member is arranged on the winding cable, wherein when external vibration occurs, the damping member contacts the outer wall of the limit baffle to achieve shock absorption.

[0008] According to a double-end movable multi-stage winding rope damper provided by the present invention, the damping element includes an over-travel locking sleeve and a multi-stage compression spring, the over-travel locking sleeve is fixedly connected to the winding rope, the multi-stage compression spring is located between the hanging ear and the limit baffle, the multi-stage compression spring is sleeved on the winding rope, and one end of the multi-stage compression spring is fixedly connected to the inner wall of the over-travel locking sleeve, and a gap is set between the other end of the multi-stage compression spring and the outer wall of the limit baffle.

[0009] According to a double-end movable multi-stage winding cable damper provided by the present invention, the bottom end of the main beam is fixedly connected to an upper connecting plate, both sides of the bottom end of the upper connecting plate are fixedly connected to upper ear plates, the top end of the pier is fixedly connected to a lower connecting plate, the limit baffle is fixedly connected to the top end of the lower connecting plate, both sides of the top end of the lower connecting plate are fixedly connected to lower ear plates, and the upper ear plates are connected to the lower ear plates.

[0010] According to a double-ended movable multi-stage winding cable damper provided by the present invention, the bridge pier is a fixed pier or a movable pier. When the bridge pier is a fixed pier, the upper ear plate and the lower ear plate are connected by a limit pin.

[0011] According to the double-ended movable multi-stage winding cable damper provided by the present invention, the upper connecting plate and the lower connecting plate are respectively connected to the main beam and the bridge pier through a plurality of anchor bolts.

[0012] According to the double-end movable multi-stage winding cable damper provided by the present invention, the friction force f of the winding cable is r satisfy:

[0013]

[0014] Wherein, F0 is the tension provided by the passive end of the winding cable; n is the number of turns of the winding cable wrapped around the friction shaft; μ s is the friction coefficient between the winding rope and the friction shaft.

[0015] According to a double-ended movable multi-stage winding cable damper provided by the present invention, the relative displacement of the pier and beam is Δx, and the multi-stage compression spring is a three-stage spring;

[0016] When Δx≤d0, the multi-stage compression spring does not participate in the work;

[0017] When d0<Δx≤d1, the multi-stage compression spring plays the first stage role, and the tension provided by the passive end is:

[0018] F0=k×(Δx-d0);

[0019] When d1<Δx≤d2, the multi-stage compression spring enters the next stage, and the tension provided by the passive end is:

[0020] F0=k×(Δx-d0)+k×(Δx-d1);

[0021] When d2<Δx≤d max When the multi-stage compression spring works, the tension provided by the passive end is:

[0022] F0=k×(Δx-d0)+k×(Δx-d1)+k×(Δx-d2);

[0023] When d max When Δx is less than Δx, the multi-stage compression spring no longer deforms, and the relative displacement increases by the stretching of the winding cable. The overtravel locking sleeve takes effect to limit excessive displacement.

[0024] Among them, d0 is the gap between one end of the multi-stage compression spring and the limit baffle, d1 is the activation displacement of the second-stage compression spring, d2 is the activation displacement of the third-stage compression spring, d max is the displacement for activating the overtravel lock function, and k is the stiffness of a single spring.

[0025] Compared with the prior art, the present invention has the following advantages and technical effects:

[0026] The present invention provides a double-ended, movable, multi-stage winding cable damper. Under earthquake conditions, after the main beam and piers are sheared, they experience greater relative displacement, causing the winding cable to slip around the friction shaft. At this point, the passive damping element, where it is connected to the winding cable, also displaces, while the other side, due to the presence of a limit stop, deforms, achieving damping and vibration reduction. This application reduces the seismic response of continuous beam bridges and improves their seismic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0028] Figure 1 It is a front view of the overall structure of the present invention;

[0029] Figure 2 It is a side view of the overall structure of the present invention;

[0030] Figure 3 It is a top view of the overall structure of the present invention;

[0031] Figure 4 This is a schematic diagram of the vibration state of the structure of the present invention;

[0032] Figure 5 This is a schematic diagram of the relative displacement of the bridge piers of the present invention;

[0033] Among them, 1. Upper ear plate; 2. Lower ear plate; 3. Limit pin; 4. Friction shaft; 5. Winding rope; 6. Multi-stage compression spring; 7. Limit baffle; 8. Hanging ear; 9. Anchor bolt; 10. Overtravel locking sleeve; 11. Upper connecting plate; 12. Lower connecting plate. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Reference Figure 1-Figure 5 The present invention provides a double-ended movable multi-stage winding cable damper, which is longitudinally arranged between the pier and the main beam, comprising:

[0037] A limit baffle 7 is installed on the top of the pier and is connected to the bottom end of the main beam above;

[0038] The damping assembly includes a friction shaft 4 and several damping members. The friction shaft 4 is rotatably connected to the limit baffle 7. Several winding ropes 5 are wound around the friction shaft 4 at equal intervals along the axial direction. Both sides of the bottom end of the main beam are fixedly connected with hanging ears 8. The two ends of the winding rope 5 pass through both sides of the limit baffle 7 respectively and are fixedly connected to the two hanging ears 8 respectively. The damping member is arranged on the winding rope 5. When external vibration occurs, the damping member contacts the outer wall of the limit baffle 7 to achieve shock absorption.

[0039] In one embodiment of the present application, under the action of an earthquake, after the main beam and pier are sheared, a greater relative displacement occurs, causing the wrapping cable 5 to slide around the friction shaft 4. At this time, the passive damping element at the side connected to the wrapping cable 5 also displaces, while the other side deforms due to the presence of the limit stopper 7, achieving damping and shock absorption.

[0040] As an optional embodiment, the damping member includes an overtravel locking sleeve 10 and a multi-stage compression spring 6. The overtravel locking sleeve 10 is fixedly connected to the winding rope 5. The multi-stage compression spring 6 is located between the hook 8 and the limit baffle 7. The multi-stage compression spring 6 is sleeved on the winding rope 5, and one end of the multi-stage compression spring 6 is fixedly connected to the inner wall of the overtravel locking sleeve 10. A gap is set between the other end of the multi-stage compression spring 6 and the outer wall of the limit baffle 7.

[0041] In one embodiment of the present application, the multi-stage compression spring 6 is nested between the limit baffle 7 and the overtravel locking sleeve 10 with the winding rope as the center. Springs of different diameters have different lengths. One end of the spring is pressed into the overtravel locking sleeve 10, and an activation gap is left between the other end and the limit baffle 7. The activation gap can be adjusted as needed through the anchoring position of the overtravel locking sleeve 10 on the winding rope 5.

[0042] As an optional embodiment, the bottom end of the main beam is fixedly connected to an upper connecting plate 11, upper ear plates 1 are fixedly connected to both sides of the bottom end of the upper connecting plate 11, the top of the pier is fixedly connected to a lower connecting plate 12, the limit baffle 7 is fixedly connected to the top of the lower connecting plate 12, lower ear plates 2 are fixedly connected to both sides of the top end of the lower connecting plate 12, and the upper ear plate 1 is connected to the lower ear plate 2.

[0043] In one embodiment of the present application, the main beam and the pier are connected by the lower ear plates 2 and the lower ear plates 2.

[0044] As an optional implementation, the bridge pier is a fixed pier or a movable pier. When the bridge pier is a fixed pier, the upper ear plate 1 and the lower ear plate 2 are connected by a limit pin 3.

[0045] In one embodiment of the present application, if the device is arranged between the fixed pier and the main beam, a limit pin 3 is installed to limit the longitudinal relative displacement between the fixed pier and the main beam; if the device is arranged between the movable pier and the main beam, this limit pin 3 is not installed.

[0046] As an optional embodiment, the upper connecting plate 11 and the lower connecting plate 12 are respectively connected to the main beam and the pier through a plurality of anchor bolts 9.

[0047] In one embodiment of the present application, the connecting plate is installed on the main beam and the pier through a plurality of anchor bolts 9 to ensure stability after the connection.

[0048] In one embodiment of the present application, the distances between two adjacent winding cables 5 are equal.

[0049] As an optional embodiment, the friction force f of the winding rope 5 is r satisfy:

[0050]

[0051] Wherein, F0 is the tension provided by the passive end of the winding cable 5; n is the number of turns of the winding cable 5 wrapped around the friction shaft 4; μ s is the friction coefficient between the winding rope 5 and the friction shaft 4.

[0052] In one embodiment of the present application, the tension provided by the passive end in the device's mechanical formula can be calculated using the spring, as shown in the formula. The displacement-force relationship of the multi-stage compression spring 6 is linear. Substituting this into the friction formula for the winding cable yields a concise relationship between the friction force of the winding cable and the longitudinal relative displacement of the pier and beam.

[0053] As an optional embodiment, the relative displacement between the pier and the beam is Δx, and the multi-stage compression spring 6 is a three-stage spring;

[0054] When Δx≤d0, the multi-stage compression spring 6 does not participate in the work;

[0055] When d0<Δx≤d1, the multi-stage compression spring 6 plays the first stage role, and the tension provided by the passive end is:

[0056] F0=k×(Δx-d0);

[0057] When d1<Δx≤d2, the multi-stage compression spring 6 enters the next stage, and the tension provided by the passive end is:

[0058] F0=k×(Δx-d0)+k×(Δx-d1);

[0059] When d2<Δx≤d max When the multi-stage compression spring 6 works, the tension provided by the passive end is:

[0060] F0=k×(Δx-d0)+k×(Δx-d1)+k×(Δx-d2);

[0061] When d max When Δx is less than Δx, the multi-stage compression spring 6 no longer deforms, and the relative displacement increases by the stretching of the winding rope 5. The overtravel locking sleeve 10 plays a role in limiting excessive displacement.

[0062] Among them, d0 is the gap between one end of the multi-stage compression spring 6 and the limit baffle 7, d1 is the activation displacement of the second-stage compression spring, d2 is the activation displacement of the third-stage compression spring, d max is the displacement for activating the overtravel lock function, and k is the stiffness of a single spring.

[0063] In one embodiment of the present application, a curve showing the relationship between friction and relative displacement is presented. The multi-stage compression spring 6 enhances the damper's effectiveness. In a specific device, the displacement-force relationship of the multi-stage compression spring 6 is linear. Substituting this into the friction formula for the winding cable 5, with only the pier-beam relative displacement as the variable, a concise relationship between the friction of the winding cable and the relative displacement of the pier and beam in the longitudinal direction of the bridge is obtained.

[0064] The working mechanism of this application is as follows: If the device is deployed between the movable pier and the main beam, the limit pin 3 is not installed. If it is deployed between the fixed pier and the main beam, the beam is connected to the upper connecting plate 11, and the pier is connected to the lower connecting plate 12. The limit pin 3 passes through and connects the upper ear plate 1 and the lower ear plate 2, acting as a restraint. Under the action of an earthquake, as the relative displacement between the pier and the beam increases, the limit pin 3 is sheared, and the winding cable 5 slides around the friction shaft 4. The side of the passive multi-stage compression spring 6 connected to the winding cable is subjected to pressure, and the overtravel locking sleeve 10 slides on the lower connecting plate 12. The side of the spring closest to the friction shaft 4 is deformed by the limit stop 7. The tensile force provided by the passive end of the device can be calculated based on the multi-stage compression spring. Under the action of a large earthquake, the overtravel locking sleeve 10 is activated, limiting excessive displacement. Because the multi-stage compression spring of this device is bidirectional, changes in the relative displacement direction are not affected.

[0065] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0066] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A double-ended movable multi-stage winding cable damper, arranged longitudinally between the pier and the main beam, characterized in that: include: A limit baffle (7) is installed on the top of the pier, and the limit baffle (7) is connected to the bottom end of the main beam above; A damping assembly comprises a friction shaft (4) and a plurality of damping members, wherein the friction shaft (4) is rotatably connected to the limit baffle (7), a plurality of winding ropes (5) are wound around the friction shaft (4) at equal intervals along the axial direction, and both sides of the bottom end of the main beam are fixedly connected with hanging ears (8), and both ends of the winding rope (5) respectively pass through both sides of the limit baffle (7) and are respectively fixedly connected to the two hanging ears (8), and the damping member is arranged on the winding rope (5), wherein when external vibration occurs, the damping member contacts the outer wall of the limit baffle (7) to achieve shock absorption.

2. The double-ended movable multi-stage winding cable damper according to claim 1, characterized in that: The damping member includes an overtravel locking sleeve (10) and a multi-stage compression spring (6), the overtravel locking sleeve (10) is fixedly connected to the winding rope (5), the multi-stage compression spring (6) is located between the hanging ear (8) and the limit baffle (7), the multi-stage compression spring (6) is sleeved on the winding rope (5), and one end of the multi-stage compression spring (6) is fixedly connected to the inner wall of the overtravel locking sleeve (10), and a gap is set between the other end of the multi-stage compression spring (6) and the outer wall of the limit baffle (7).

3. The double-ended movable multi-stage winding cable damper according to claim 1, characterized in that: The bottom end of the main beam is fixedly connected to an upper connecting plate (11), both sides of the bottom end of the upper connecting plate (11) are fixedly connected to upper ear plates (1), the top end of the pier is fixedly connected to a lower connecting plate (12), the limit baffle (7) is fixedly connected to the top end of the lower connecting plate (12), both sides of the top end of the lower connecting plate (12) are fixedly connected to lower ear plates (2), and the upper ear plate (1) is connected to the lower ear plate (2).

4. The double-ended movable multi-stage winding cable damper according to claim 3, characterized in that: The bridge pier is a fixed pier or a movable pier. When the bridge pier is a fixed pier, the upper ear plate (1) and the lower ear plate (2) are connected via a limit pin (3).

5. The double-ended movable multi-stage winding cable damper according to claim 3, characterized in that: The upper connecting plate (11) and the lower connecting plate (12) are respectively connected to the main beam and the bridge pier via a plurality of anchor bolts (9).

6. The double-ended movable multi-stage winding cable damper according to claim 1, characterized in that: The friction force f of the winding rope (5) r satisfy: Wherein, F0 is the tension provided by the passive end of the winding cable (5); n is the number of turns of the winding cable (5) wound around the friction shaft (4); μ s is the friction coefficient between the winding rope (5) and the friction shaft (4).

7. The double-ended movable multi-stage winding cable damper according to claim 2, characterized in that: The relative displacement between the pier and the beam is Δx, and the multi-stage compression spring (6) is a three-stage spring; When Δx≤d0, the multi-stage compression spring (6) does not participate in the work; When d0<Δx≤d1, the multi-stage compression spring (6) plays the role of the first stage, and the tension provided by the passive end is: F0=k×(Δx-d0); When d1<Δx≤d2, the multi-stage compression spring (6) enters the next stage, and the tension provided by the passive end is: F0=k×(Δx-d0)+k×(Δx-d1); When d2<Δx≤d max When the multi-stage compression spring (6) works, the pulling force provided by the passive end is: F0=k×(Δx-d0)+k×(Δx-d1)+k×(Δx-d2); When d max When Δx is less than the value of the multi-stage compression spring (6), the multi-stage compression spring (6) no longer deforms, the relative displacement increases by the amount of the winding rope (5) being stretched, and the overtravel locking sleeve (10) takes effect to limit excessive displacement; Wherein, d0 is the gap between one end of the multi-stage compression spring (6) and the limit baffle (7), d1 is the activation displacement of the secondary compression spring, d2 is the activation displacement of the tertiary compression spring, d max is the displacement for activating the overtravel lock function, and k is the stiffness of a single spring.

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