CN106337362A - Vibration isolator for bridge - Google Patents

Abstract

The invention discloses a vibration isolator for a bridge, which comprises a support matched with the bridge beam body and a vibration-damping support mechanism for supporting the support and used for vibration reduction; the vibration-damping support mechanism includes an outer sleeve, a support sleeve and a sleeve body support assembly, the support includes a seat body and a sliding rod body, and a first shock absorber for vertical movement and vibration reduction of the support is arranged between the sliding rod body and the support sleeve; the support is a friction pendulum structure support, which has better Due to the effect of friction energy consumption, the vibration damping support mechanism forms a floating support for the whole support, which greatly reduces the transmission of vibration from the bridge beam body to the bridge foundation, thereby reducing the vibration of surrounding buildings; at the same time, the vertical displacement of the bridge When the support is squeezed, the first shock absorber set in the support sleeve will buffer the vertical impact force on the bridge; the structure of the present invention is compact, and all parts cooperate with each other and cooperate to achieve the above-mentioned The effect is quite good overall.

Description

Vibration Isolators for Bridges

technical field

The invention relates to the technical field of bridge vibration reduction, in particular to a bridge vibration isolator.

Background technique

At present, seismic isolation, energy consumption and vibration reduction technologies have gradually attracted the attention of countries all over the world and are widely used in building structures and bridge structures. The most common types of existing bridge isolation systems are natural rubber bearings and lead rubber bearings. Bridge rubber bearings are usually installed between the bridge superstructure, piers and abutments, which can comprehensively reduce the seismic load and reduce the seismic load. The damage to the bridge structure has the dual functions of shock isolation and energy dissipation; at the same time, they also support the weight of the upper main structure and provide elastic recovery.

However, although the natural rubber bearing is cheap, the shock absorption and isolation function is not obvious enough, and the lead rubber bearing has a good shock isolation effect but the pollution to the environment is relatively serious. At the same time, with the popularization of rail transit such as urban light rail bridges, while bringing convenience to the city, it also brings vibration and noise to the surrounding buildings and residents of light rail and subway rail bridges. Therefore, the construction of urban rail bridges Higher requirements are put forward for vibration and noise reduction. However, the existing rail transit bridge vibration and noise reduction devices have limited vibration reduction effects, and usually have complex structures and high costs, which cannot meet the needs of use.

Therefore, it is necessary to improve the existing bridge vibration isolator, which not only has a simple structure, meets the vibration reduction requirements of the bridge, but also improves the horizontal stiffness of the bridge.

Contents of the invention

In view of this, the present invention provides a bridge vibration isolator, which not only has a simple structure, meets the vibration reduction requirements of the bridge, but also improves the horizontal stiffness of the bridge.

The bridge vibration isolator of the present invention includes a support that cooperates with the bridge beam body and a vibration-damping support mechanism that supports the support and is used for vibration reduction;

The support includes an upper seat plate, a lower seat body, and a double-spherical rotating block arranged between the upper seat plate and the lower seat body. The upper and lower spherical surfaces of the double-spherical rotating block respectively form spherical friction pairs with the upper seat plate and the lower seat ;

The vibration-damping support mechanism includes an outer sleeve, a support sleeve that forms a vibration-damping support for the support, and a sleeve support assembly that is arranged in the outer sleeve to form a floating support for the support sleeve. The lower seat body includes a seat body and a seat body. A sliding rod body that is connected to and extends into the support sleeve for sliding fit, and a first shock absorber for damping the vertical movement of the support is arranged between the sliding rod body and the support sleeve.

Further, a support seat is formed in the support sleeve, and the first shock absorber is a disc spring that is supported and disposed between the sliding rod body and the support sleeve.

Further, the vertical section of the sliding rod body is a T-shaped structure, including a shoulder body and a rod body part, the rod body part forms a guide part for vertical movement, and guide holes are correspondingly provided in the support sleeve, and the upper end of the first shock absorber is supported on The shoulder body.

Further, the sleeve support assembly includes an annular outer support body and an inner support body, the inner support body and the outer support body are fixed in circumference, the lower end of the support sleeve is inserted into the inner support body and is supported on the inner support body as a whole, and the support sleeve The lower end is set in non-contact with the bottom of the outer sleeve.

Further, a floating space is formed between the bottom of the inner support body and the bottom of the outer sleeve, and a second shock absorber supporting the inner support body is arranged in the floating space.

Further, the second shock absorber is also a disc spring.

Further, the vibration isolator also includes a third shock absorber that is arranged on the top of the outer sleeve and whose upper end supports the bottom of the seat body of the lower seat.

Further, the third damping member is a damping spring.

Further, both the outer support body and the inner support body are made of rubber material.

Further, a reinforcement plate is provided on the inner side of the bottom of the outer sleeve to position the outer support body and improve its support strength.

Beneficial effects of the present invention: the bridge vibration isolator of the present invention, the support is a friction pendulum structure support, which has a good effect of frictional energy consumption, and the vibration-reducing support mechanism forms a floating support for the support as a whole, that is, the support The whole is isolated from the bridge foundation (bridge pier or abutment), which greatly reduces the transmission of vibration from the bridge girder body to the bridge foundation, thereby reducing the vibration of surrounding buildings; at the same time, the vertical displacement of the bridge squeezes the support , the first shock absorber set in the support sleeve will buffer the vertical impact force on the bridge; in addition, the present invention adopts the setting of sliding fit between the sliding rod body of the support and the inner sleeve of the support sleeve, and the support sleeve In addition, the floating and stable support is formed by the sleeve support assembly, which has good integrity and clear structural force transmission path, and at the same time greatly increases the transverse horizontal stiffness of the bridge; the structure of the present invention is compact, and all parts cooperate with each other and cooperate to achieve the above-mentioned The effect is quite good overall.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a schematic diagram of the structure of the present invention.

detailed description

Fig. 1 is a schematic diagram of the structure of the present invention, as shown in the figure: the bridge vibration isolator of the present embodiment includes a support that cooperates with the bridge beam body and a vibration-damping support mechanism that supports the support and is used for vibration reduction;

The support includes an upper seat plate 11, a lower seat body 1 and a double spherical rotating block 13 arranged between the upper seat plate 11 and the lower seat body 12. The upper and lower spherical surfaces of the double spherical rotating block 13 correspond to the upper seat plate 11 and the lower seat body 1 respectively. Form a spherical friction pair; the upper and lower surfaces of the double-spherical turning block 13 are convex spherical surfaces, the lower surface of the upper seat plate 11 and the upper surface of the lower seat body are concave spherical surfaces matched with the double-spherical turning block 13, the upper seat plate 11 and The lower surface of the double spherical rotating block 13 is provided with a wear-resistant steel plate 14. This structure can have a good effect of anti-seismic friction and energy consumption, thereby realizing the functions of vibration isolation, energy consumption and shock absorption of urban rail transit bridges, and can improve the level of Rigidity; In addition, a protective cover 15 is provided between the upper seat plate 11 and the lower seat body 1 to improve the durability of the device;

The vibration-damping support mechanism includes an outer sleeve 2, a support sleeve 3 that forms a vibration-damping support for the support 1, and a sleeve support assembly that is arranged in the outer sleeve 2 to form a floating support for the support sleeve 3. The lower base 12 includes The seat body 1-1 and the sliding rod body 1-2 that is connected with the seat body 1-1 and extends into the support sleeve 3 for sliding fit, the vertical support for the support 1 is arranged between the sliding rod body 1-2 and the support sleeve 3 The first shock absorber 4 that moves to absorb vibration; as shown in the figure, the sliding rod body 1-2 is inserted into the support sleeve 3, and when the support 1 is vertically squeezed as a whole, the sliding rod body 1-2 is inside the support sleeve 3 Move and extrude the first shock absorber 4, the first shock absorber 4 will provide a reaction force, thereby playing a buffering role; in use, the outer sleeve 2 of the present invention is fixed on the bridge foundation, and the bridge foundation refers to a bridge pier or For basic components such as abutments, the support 1 is connected to the bridge beam body, and at the same time, the sleeve support assembly forms a floating support for the support sleeve 3. The so-called floating support means that the support sleeve 3 does not contact or indirectly contact with the bridge foundation, thereby reducing The vibration from the bridge girder is transmitted to the bridge foundation, reducing the vibration of surrounding buildings.

In this embodiment, a support seat 3-1 is formed in the support sleeve 3, and the first shock absorber 4 is a disc spring that is supported between the sliding rod body 1-2 and the support sleeve 3; the disc spring is composed of a plurality of discs The reeds are arranged in contact with each other, and can withstand relatively large loads with relatively small deformation, and the requirements can be met by being arranged in the narrow axial space in the support sleeve 3, making the structure more compact.

In this embodiment, the vertical section of the sliding rod body 1-2 is a T-shaped structure, including a shoulder body part 1-2-1 and a rod body part 1-2-2, and the rod body part 1-2-2 forms a vertical movement The guide part of the support sleeve 3 is correspondingly provided with a guide hole 3-2, and the upper end of the first shock absorber 4 is supported on the shoulder body 1-2-1.

In this embodiment, the sleeve support assembly includes an annular outer support body 5 and an inner support body 6, the inner support body 6 and the outer support body 5 are fixed in circumference, and the lower end of the support sleeve 3 is inserted into the inner support body 6 and supported as a whole It is arranged on the inner support body 6, and the lower end of the support sleeve 3 is arranged in non-contact with the bottom of the outer sleeve 2; the so-called non-contact arrangement means that the lower end of the support sleeve 3 and the inner side of the bottom of the outer sleeve 2 do not contact each other, thereby forming a floating arrangement; The inner side of the circumference of the outer support body 5 is provided with an annular installation groove, and the outer side of the inner support body 6 is provided with a circumferential fixed block 6-1, the circumferential fixed block and the annular installation groove form an embedded installation, and the outer side of the support sleeve 3 is formed with a shaft shoulder 3-3 , the shaft shoulder directly falls on the upper end surface of the inner support body 6 to form a positioning installation.

In this embodiment, a floating space 7 is formed between the bottom of the inner support body 6 and the bottom of the outer sleeve 2, and a second shock absorber 8 supporting the inner support body 6 is arranged in the floating space 7; 3. When receiving the vertical pressure of the support 1, the second damping member 8 can be used to indirectly buffer and attenuate, which has better work unity, and has a compact structure and does not occupy space.

In this embodiment, the second damping member 8 is also a disc spring; similarly, the disc spring of the second damping member 8 is also formed by a plurality of disc springs offsetting each other, which can withstand a relatively large load with a small deformation. The requirements can be met in the floating space 7, making the structure more compact.

In this embodiment, the vibration isolator also includes a third shock absorber 9 that is arranged on the top of the outer sleeve 2 and whose upper end supports the bottom of the seat body 1-1 of the lower seat body 12; the third shock absorber 9 is a Vibration spring; the vibration damping spring is set outside the supporting sleeve 3 to further improve the vibration damping effect, and can cooperate with the first vibration damping member 4 .

In this embodiment, both the outer support body 5 and the inner support body 6 are made of rubber materials; that is, both the outer support body 5 and the inner support body 6 are rubber bodies, which can separate the vibration from the bridge from the bridge foundation Come.

In this embodiment, the inner side of the bottom of the outer sleeve 2 is provided with a reinforcement plate 10 for positioning the outer support body 5 and improving its support strength;

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (10)

1. A vibration isolator for a bridge, characterized in that: it includes a bearing that cooperates with the bridge beam body and forms a support to the bearing and is used for a damping support mechanism for vibration reduction; The support includes an upper seat plate, a lower seat body, and a double-spherical rotating block arranged between the upper seat plate and the lower seat body. The upper and lower spherical surfaces of the double-spherical rotating block respectively form spherical friction pairs with the upper seat plate and the lower seat ; The vibration-damping support mechanism includes an outer sleeve, a support sleeve that forms a vibration-damping support for the support, and a sleeve body support assembly that is arranged in the outer sleeve to form a floating support for the support sleeve. The lower seat body includes a seat body and a The seat body is connected to and extends into the sliding rod body which is slidably matched with the supporting sleeve, and a first shock absorber for damping the vertical movement of the support is arranged between the sliding rod body and the supporting sleeve. 2. The vibration isolator for a bridge according to claim 1, characterized in that: a support seat is formed in the support sleeve, and the first shock absorber is a supporting device between the sliding rod body and the support sleeve. disc spring. 3. The bridge vibration isolator according to claim 2, characterized in that: the vertical section of the sliding rod body is a T-shaped structure, including a shoulder body and a rod body, and the rod body forms a vertical movement The guide portion of the support sleeve is correspondingly provided with a guide hole, and the upper end of the first shock absorber is supported on the shoulder portion. 4. The vibration isolator for a bridge according to claim 3, characterized in that: said casing support assembly comprises an outer support body and an inner support body both of which are ring-shaped, and said inner support body and the outer support body are circumferentially fixed, The lower end of the support sleeve is inserted into the inner support body and is supported on the inner support body as a whole, and the lower end of the support sleeve is arranged in non-contact with the bottom of the outer sleeve. 5. The bridge vibration isolator according to claim 4, characterized in that: a floating space is formed between the bottom of the inner support body and the bottom of the outer sleeve, and an inner support body is arranged in the floating space to form a Supported second shock absorber. 6. The vibration isolator for a bridge according to claim 5, characterized in that: the second damping member is also a disc spring. 7. The bridge vibration isolator according to claim 6, characterized in that: the vibration isolator also includes a third vibration damper which is arranged on the top of the outer sleeve and whose upper end supports the bottom of the seat body of the lower seat. pieces. 8. The bridge vibration isolator according to claim 7, characterized in that: the third damping member is a damping spring. 9. The bridge vibration isolator according to claim 8, characterized in that: both the outer support body and the inner support body are made of rubber material. 10. The vibration isolator for a bridge according to claim 9, characterized in that: a reinforcement plate is provided on the inner side of the bottom of the outer sleeve to position the outer support body and improve its support strength.