Track is the foundation of crane or car running smoothly, generally requires checking 2 ~ 4 times every year.

轨道是起重机或小车平稳运行的基础，一般要求每年检查2 ~ 4次。

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The contact zone width of crane wheel with track is analyzed by plane stress elastic theory.

采用平面应力弹性理论，对吊车车轮与轨道的接触区尺寸进行理论分析。

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To walk after fixed tower crane should remain on track, such as fixed position in backfill soil, the foundation for special treatment, must meet the load requirements.

先行走后固定塔吊应立于轨道上，如后固定位置处于回填土上时，其基础作特殊处理，必须满足承载要求。

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But with the crane on track, it necessitated the safety car, resulting in the pitlane being immediately closed.

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The first phase was halted after four minutes when Italian Giancarlo Fisichella spun and stalled his Ferrari, with the car having to be lifted off the track with a crane causing a 14-minute delay.

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