木桥枕的平均使用寿命为15至25年,它取决于运量和轨道曲线半径的大小。木枕常发生火灾,有几次对运输曾引起较大的破坏作用。混凝土桥枕则具有减少桥枕维修、延长使用寿命和消除火灾危害等优点。 70年代末,加拿大预应力混凝土学会召开了一次年会,目的是促进预制预应力混凝土在 The average service life of a wooden bridge pillow is 15 to 25 years depending on the volume and the radius of the orbit curve. Wood pillow often fire, several times on the transport had caused greater damage. Concrete bridge is to reduce the bridge pillow repair, extend the service life and eliminate the hazards of fire and so on. In the late 1970s, Canada Society for Prestressed Concrete held an annual meeting to promote precast prestressed concrete in