伸缩装置（Composite expansion and contraction installation)依据交通部JT/T327-2004文件定义，是指为使车辆平稳通过桥面并满足桥梁上部结构变形的需要，在桥梁伸缩缝处设置的由橡胶和钢材等构件组成的各种装置的总称。
3.1伸缩缝Expansion and contraction joint 3.2伸缩装置Composite expansion and contraction installation 3.3伸缩jt Expansion and contraction quantity ..
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The influence is the disadvantage to the abutment and superstructure, specially movement of abutment, great movement of abutment can make the bearing ,expansion device, back wall and beam local pressure distortion even fracture.
对桥台甚至桥梁上部结构不利，主要的是引起桥台前移，过大桥台前移将造成支座、伸缩装置、背墙或梁局部受压变形甚至破坏。
参考来源 - 软土路基桥台桩基设计计算关键问题研究Two styles of anti-seismic expansion and contraction installation and the detail structure of each is designed.
提出两种减震伸缩装置的构造形式，并对这两种减震伸缩装置进行了详细的细部构造设计。
参考来源 - 公路桥梁减震伸缩装置研究·2,447,543篇论文数据，部分数据来源于NoteExpress
安全带预紧装置则嵌入到安全带伸缩装置中。
The seat belt pre-tensioner is incorporated in the seat belt retractor.
桥梁伸缩装置疲劳寿命要受到各种因素的影响。
The fatigue life of the bridge expansion device are influenced by many factors.
桥梁伸缩装置是桥梁工程的重要附属结构，影响桥梁舒适和成本。
The bridge expansion and contraction installation is one of the important accessory structures of the bridge.
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