A replaceable assembled shock-absorbing bridge pier

Abstract

The invention discloses a replaceable assembled shock-absorbing bridge pier, which comprises stretchable unbonded prestressed steel strands, one end of which is anchored to the top of the bridge pier body, and the other end is anchored to the end of the sliding block in the cap to connect the pre-buried Slides and assembled columns in the caps. Under the action of small earthquakes and moderate earthquakes, the unbonded prestressed steel strands can convert the horizontal seismic displacement of the top of the pier into the horizontal sliding of the sliding block in the cap and dissipate energy through friction during the swaying process of the prefabricated shock-absorbing pier. To control the deformation of the pier top of the assembled pier within a reasonable range; the adjusting bolt can adjust the vertical pressure between the friction block and the friction surface to adjust the sliding friction, which can adapt to the shock absorption control requirements of the assembled pier of different sizes; when a large earthquake occurs , the limit block at the end of the sliding device in the cap can instantly lock the horizontal displacement of the sliding block, and then lock the horizontal displacement of the pier top, so as to ensure that the prefabricated pier will not collapse due to excessive horizontal displacement under a large 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

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