Replaceable prefabricated shock-absorbing pier

Abstract

The invention discloses a replaceable prefabricated shock-absorbing pier comprising telescopic unbonded prestressed steel strands, wherein one end of each telescopic unbonded prestressed steel strandis anchored to the top of a pier body and the other end of each telescopic unbonded prestressed steel strand is anchored to the end of a sliding block in a pile cap so as to be connected to a slidingdevice and assembling column blocks pre-buried in the pile cap. Under the action of small earthquakes and moderate earthquakes, in the rocking process of the prefabricated shock-absorbing pier, the unbonded prestressed steel strands can transform horizontal seismic displacement of a pier top into horizontal sliding of the sliding block in the pile cap and dissipate energy through friction so as tocontrol the deformation of the pier top of the prefabricated pier to be in a reasonable range. Adjusting bolts can adjust the vertical pressure between the sliding block and a friction surface so asto adjust the sliding friction force to adapt to shock-absorbing control requirements of prefabricated piers of different sizes. When a major earthquake occurs, position-limiting blocks at the ends ofthe sliding device in the pile cap can instantly lock the horizontal displacement of the sliding block so as to lock the horizontal displacement of the pier top to ensure that excessive horizontal displacement and collapse of the prefabricated pier can be avoided in the event of the major earthquake.

Description

technical field [0001] The invention relates to a bridge pier, in particular to a replaceable assembled shock-absorbing bridge pier, which belongs to the technical field of bridge anti-seismic and shock-absorbing control. Background technique [0002] With the development of the economy and the advancement of science and technology, the degree of industrial production of commodities is getting higher and higher. In bridge construction, the pursuit of high efficiency, standardized production, fast installation, and the elimination of expensive formwork in deep valleys and waterways has promoted the development of prefabricated segment assembly technology. At present, the assembly technology of the upper structure of the bridge develops rapidly and is widely used, but the lower structure still adopts the method of pouring in situ, and the development is slow. One of the important reasons that affects the popularization and use of prefabricated piers is the lack of systematic u...

AI Technical Summary

Problems solved by technology

At present, the assembly technology of the upper structure of the bridge develops rapidly and is widely used, but the lower structure still adopts the method of pouring in situ, and the development is slow. One of the important reasons that affects the popularization and use of prefabricated piers is the lack of systematic understanding of the seismic performance of prefabricated piers. Research and understanding, no code rules to follow in seismic design

[0003] At present, there are mainly two methods in terms of seismic performance and shock absorption control of prefabricated piers: one is built-in energy-dissipating steel bars, which can effectively improve the energy dissipation capacity of segmental prefabricated piers, and the yield strength and ultimate strength can also be effectively Significantly improved, but no obvious improvement after exceeding a certain range

The other is peripheral energy-dissipating devices. Many scholars try to attach energy-dissipating devices to key parts of pier columns. However, at present, the relevant mechanical properties are mainly based on experimental analysis, and it is difficult to conduct accurate quantitative analysis theoretically.

At present, more energy is consumed by installing dampers, but the oil leakage of the damper, the installation gap and the bending of the piston rod will cause the damper to fail

Once the damper fails, not only the original setting purpose cannot be achieved, but also unexpected bad effects may occur

Images