从顶板管理、顶板压力计算、 安全系数校核方面进行了介绍，并且在大倾角工作面三防措施管理方面进行了详细的阐述。

The roof management, roof pressure computing, assurance coefficient checking are introduced. Three kinds of protecting methods of working face management are expounded.

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通过管道壁厚、管道应力、安全系数的校核，表明该批钢材仍符合要求，但要加强安全监督。

After checking the pipe wall thickness, pipe stress and safety factors this batch of steel material has still complied with the requirements, while safety Surveillance should be enhanced.

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通过假定刨链的运行方向，确定刨链的最大拉力点，以校核刨链的抗拉强度，得出刨链的安全系数。

Through the assumed moving direction of the plow chain, the maximum pull point is determined, the tensile strength of the plow chain is checked, the safe coefficient of the plow chain is obtained.

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