So analysis the influencing factors and calculating measure of bridge expansionjoint, makes for developing the new product and reasonable selecting of expansionjoint.
因此从多方面分析影响伸缩量的因素和计算方法，有助于研制新产品和选择合理的伸缩装置。
2
But how to estimate and maintain the bridge expansionjoint is an urgently problem to be solved by the manage department of the highway.
桥梁伸缩装置的破损程度如何评价，如何养护维修，是公路管理养护部门急需解决的问题。
3
Expansion joints due to large aluminum alloy temperature deformation, to make the curtain wall has enough deformation servo, curtain wall pillar setting expansionjoint.