CN215482257U - Angle steel spring damper for anti-roll damping system - Google Patents

Abstract

The utility model provides an angle steel spring damper for an anti-heeling shock absorption system, which comprises angle steel, an angle steel ear plate, a spring inserting plate, a spring and a pin bolt, wherein the angle steel is in an obtuse U shape with 90 degrees, and two sides of the angle steel are respectively arranged on a bearing platform and a pier through an angle steel embedded bolt hole and an embedded steel plate; the spring is fixedly connected with the spring inserting plate; enough clearance should be left between the spring inserting plate and the angle steel ear plate, and the spring inserting plate is connected with the angle steel ear plate through a pin bolt; the spring inserting plate can rotate freely around the pin bolt, and the spring is guaranteed to be only stressed by axial force. The angle steel spring damper applied to the anti-roll shock absorption system is added with the external angle steel spring damper to ensure the rigidity requirement in the normal use stage, can fully dissipate energy under the action of an earthquake, prevent pier roll and provide self-restoring force, further reduce the dynamic response of a bridge, concentrate damage on a support and the angle steel spring damper, realize quick maintenance and replacement after the earthquake, and improve the anti-seismic toughness.

Description

Angle steel spring damper for anti-roll damping system

Technical Field

The utility model belongs to the field of bridge engineering seismic resistance, and particularly relates to an angle steel spring damper applied to a side-inclination-preventing shock absorption system.

Background

At present, the existing bridge pier prefabricated segment assembly has the defects of easy opening of segment joints, poor integrity and the like, and is limited in application in medium and high-intensity areas. In addition, when only a single pier is arranged in the transverse direction, the common hidden danger of insufficient transverse stability exists.

Compared with the traditional ductility system, the swing self-resetting system proposed in recent years isolates the input of seismic energy through the swing of the pier and provides the self-resetting capability through the prestress, has the advantages of small residual displacement, good self-resetting performance, quick repair after the earthquake and the like, and is particularly suitable for the section assembly pier with the natural pier bottom joint.

However, the single swinging system has weak energy consumption capability, and an external energy consumption damper which is easy to repair and replace is needed. The swing self-reset system has the risk of pier tilting when the pier top displacement is too large, is particularly prominent when a vehicle is in a unbalance loading state, and particularly for a single-column pier, in order to avoid the situation that the pier tilting is caused by the fact that the gravity center of an upper structure exceeds a swing shaft, only a small swing angle is adopted, so that the function of the swing system cannot be fully exerted. The inventor proposes that angle steel is adopted for reinforcing a swing interface, but the angle steel plays more roles in improving horizontal bearing capacity and increasing energy consumption capacity, and the angle steel still loses rigidity after yielding and cannot avoid side-tipping failure.

In summary, the segmental assembling pier is suitable for adopting a swinging pier system, but the energy consumption capability is weak, the transverse side-tipping risk is caused under the action of vehicle unbalance loading and earthquake, the advantages of the swinging system cannot be fully exerted, and the technical scheme which can effectively consider and solve the problem is lacked in the prior art.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems of weak shock resistance, prominent anti-roll problem and the like of the segmental assembled single-column pier explained in the background art, the utility model provides an angle steel spring damper applied to an anti-roll damping system, wherein an external angle steel spring damper is added to ensure the rigidity requirement in the normal use stage, the energy can be fully dissipated under the action of an earthquake, the pier is prevented from rolling and self-restoring force is provided, the dynamic response of a bridge is further reduced, the damage is concentrated on a support and the angle steel spring damper, the rapid maintenance and replacement can be realized after the earthquake, and the anti-seismic toughness is improved.

In order to achieve the purpose, the method is realized by the following technical scheme:

the utility model provides an angle steel spring damper for preventing heeling shock mitigation system, prevent heeling shock mitigation system includes pier and cushion cap, the pier with be equipped with pre-buried steel sheet between the cushion cap, angle steel spring damper includes angle steel, angle steel otic placode, spring insert board, spring and cotter, wherein:

the angle steel is in a 90-degree obtuse U shape, angle steel embedded bolt holes are formed in two sides of the angle steel, and two sides (bent outer walls) of the angle steel are respectively installed on the bearing platform and the bridge pier through the angle steel embedded bolt holes and the embedded steel plates;

the spring is fixedly connected with the spring inserting plate;

enough clearance should be left between the spring inserting plate and the angle steel ear plate, and the spring inserting plate is connected with the angle steel ear plate through a pin bolt; the spring inserting plate can rotate freely around the pin bolt, and the spring is guaranteed to be only stressed by axial force.

The beneficial effects of the utility model include:

1) the angle steel spring damper can improve the rigidity and the strength of the pier before yielding, meet the rigidity requirement in a normal use state, yield and dissipate seismic energy after the pier enters into swinging, and reduce the internal force and the displacement response of the pier.

2) The springs in the angle steel spring damper can continue to provide rigidity and restoring force after the angle steel yields, pier rolling caused by the fact that the gravity of the upper structure is converted from anti-rolling moment to rolling moment when the gravity center of the upper structure exceeds the swing shaft is avoided, and the range of the allowed swing angle is enlarged.

3) The maintenance cost is reduced, the social and economic benefits are good, and the method is worthy of popularization and application.

Drawings

Fig. 1(a) is an overall elevation structure schematic diagram of the angle steel spring damper of the present invention.

Fig. 1(b) is a schematic structural view of a spring in the angle steel spring damper of the present invention.

Fig. 1(c) is a schematic structural view of angle steel in the angle steel spring damper of the present invention.

Fig. 1(d) is an enlarged schematic view of the joint of a spring insert plate and an angle iron ear plate in the angle iron spring damper of the utility model.

Fig. 2 is a schematic elevation structure view of the anti-roll single column pier of the utility model.

Fig. 3 is a schematic view of the pier swinging state under the action of the large earthquake corresponding to fig. 2.

The labels in the figure are:

1-superstructure; 2-a support;

3-bridge pier; 4-unbonded prestressed tendons;

5-angle steel spring damper; 51-angle steel; 52-reserving bolt holes on the angle steel; 53-angle steel ear plate; 54-spring insertion plate; 55-a spring; 56-pin bolt;

6, pre-burying a steel plate; 7-bearing platform.

Detailed Description

The utility model is described in detail below with reference to the attached drawing figures:

fig. 1(a) to 1(d) are schematic structural views of respective components of the angle spring damper 5:

as shown in fig. 1(a) to 1(d), an angle spring damper 5 includes an angle 51, an angle lug 53, a spring insert 54, a spring 55, and a pin 56, wherein:

the angle steel 51 is in a blunt U shape with 90 degrees, and two sides are respectively installed on the bearing platform 7 and the pier 3 through the angle steel embedded bolt hole 52 and the embedded steel plate 6;

the spring 55 is fixedly connected with the spring inserting plate 54;

enough clearance should be left between the spring inserting plate 54 and the angle iron ear plate 53, and the spring inserting plate 54 is connected with the angle iron ear plate 53 through a pin 56; so that the spring insert plate 54 can rotate freely about the pin 56, ensuring that the spring 55 is subjected to only axial forces.

The angle iron 51 and the spring 55 are manufactured separately.

The size, material and other parameters of the angle steel 51 and the spring 55 are determined according to actual requirements.

The angle steel spring damper can be applied to an anti-roll damping system, has the characteristics of increasing energy consumption capability and providing self-resetting capability, can avoid the roll failure of a pier, is easy to inspect, repair and replace, and meets the requirement of quick recovery after an earthquake.

The material performance requirements of the angle steel spring damper 5 are as follows:

the steel of the angle steel 51 has an obvious yield point, ensures definite yield force, can well distinguish the front and rear stages of swinging, is definite in stress, has good plastic deformation capacity, provides sufficient energy consumption capacity, avoids early brittle fracture in the swinging process, and ensures full development of the swinging angle, so that the adoption of mild steel is recommended;

the angle ear plate 53, spring insert plate 54, spring 55 and pin 56 should all be made of high strength steel to avoid coming into yield.

During practical engineering application, as shown in fig. 2, the anti-roll shock absorption system comprises a pier 3 and a bearing platform 7, an embedded steel plate 6 is arranged between the pier 3 and the bearing platform 7, an angle steel spring damper 5 is arranged in each of the transverse bridge direction and the longitudinal bridge direction at the bottom of the pier 3 and connected with the bearing platform 7, and the connection mode is high-strength bolt connection. The angle steel spring damper 5 is connected with the column pier 3 and the embedded steel plate 6 at the top of the bearing platform 7 through high-strength bolts.

The roll failure of the single column pier is avoided by the angle steel spring damper 5. The damage is concentrated on the angle steel spring damper 5, and the angle steel spring damper is easy to repair and replace, so that the rapid repair after the earthquake is realized.

Referring to fig. 2 and 3, in the normal use stage, the angle steel 51 keeps elasticity, so as to prevent the pier from entering the swing stage; when earthquake occurs, the bending moment and the horizontal force at the bottom of the pier are increased, the angle steel 51 is bent, and the bottom of the pier swings. The stress of the spring 55 is related to the relative displacement of the angle iron ear plates 53 at the two sides, when the angle iron 51 is in an elastic stage, the deformation is small, and the spring 55 is basically not stressed; when the angle steel loses rigidity after entering a plastic stage, the relative displacement of the ear plates 53 of the angle steel on the two sides is increased, the relative displacement is related to the swing angle of the pier bottom, the spring 55 enters a stress stage to provide elastic support, and the phenomenon that the swing angle of the pier bottom is too large and the side-tipping failure of the pier caused by the fact that the gravity center of the main beam exceeds a swing shaft is avoided.

The embodiments of the present invention are merely illustrative, and not restrictive, of the scope of the claims, and other substantially equivalent alternatives may occur to those skilled in the art and are within the scope of the present invention.

Claims (1)

1. The utility model provides an angle steel spring damper for preventing heeling shock-absorbing system, prevent heeling shock-absorbing system includes pier (3) and cushion cap (7), pier (3) with be equipped with pre-buried steel sheet (6) between cushion cap (7), its characterized in that, including angle steel (51), angle steel otic placode (53), spring insert board (54), spring (55) and cotter (56), wherein:

the angle steel (51) is in an obtuse U shape with an angle of 90 degrees, angle steel pre-embedded bolt holes (52) are formed in two sides of the angle steel (51), and the bent outer wall of the angle steel (51) is installed on the bearing platform (7) and the pier (3) through the angle steel pre-embedded bolt holes (52) and the pre-embedded steel plate (6) respectively;

the two ends of the spring (55) are respectively and fixedly provided with the spring inserting plates (54);

angle steel otic placode (53) set firmly in on the internal face of angle steel (51), spring inserting plate (54) with the clearance has between angle steel otic placode (53), spring (55) both ends spring inserting plate (54) with angle steel otic placode (53) pass through cotter (56) are connected, and then spring inserting plate (54) can center on cotter (56) free rotation.

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