The partially slewing crane is a kind of representative rotary rail crane, which is also the first developed type in our country.

门座起重机是我国研制最早、具有重要代表性的一种旋转式有轨起重机。

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With the impact and vibration of the crane, it may cause the rail installation loose, the connector fall off, deformation, crack, precision index super difference.

随着起重机运行时产生的冲击和振动，可能引起轨道安装的松动、连接件脱落、变形、裂纹、精度指标超差。

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Material for rail of crane is of strong strength because of high carbon content, but of poor weldability, which makes more cracks. Strict technique is required in such welding.

吊车轨道的材料由于其含碳量较高， 强度大， 可焊性较差， 焊接时容易产生裂纹， 因此要严格按照工艺执行。

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David Crane, Special Advisor to the Governor and Chair, High Speed Rail Commission, California.

WHITEHOUSE: Vice President Biden Transportation Secretary LaHood Hold High Speed Rail Roundtable on Wednesday June 3rd | The White House

Beijing News on Monday quoted people from the China Railway No. 3 Engineering Group as saying that the pits were dug to make room for a giant crane to lift away the rest of the carriages that remain on the overhead rail tracks.

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