Pipe roof support is an assisted method of shallow tunneling.

管棚支护是浅埋暗挖法施工中的一种辅助工法。

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Roof Support elevation, the axis displacement and cross-deflection, the measurement made by the record.

屋架支座的标高、线位移、中挠度，经测量做出记录。

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Analyzed the problem that exist in suspension roof support, and presented the new type strong steel big-end bolt can solve this problem.

分析了普通金属锚杆存在的问题，并提出新型金属粗尾锚杆可以很好地解决这方面存在的问题。

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The coroner heard early investigations revealed the cause was a failure in the roof support system.

BBC: Pit death inquest: Gerry Gibson died from asphyxiation

Siwei manufactures roof support products for underground mining and has a significant presence in the local Chinese market.

FORBES: Caterpillar's Earnings: Global Demand And China Fallout In Focus

Safety regulations require stronger roof support to protect occupants in crash or rollover.

FORBES: Magazine Article