head wall是什么意思

用法例句

In order to resolve the safty problem of windward wall spaUing off in deeper and deeper shaft driving soft rock roadway,the theory methods about mechanics of rock mass and materials mechanics and geologic mechanics are used to study its mechanism of spalling off and its optimial rockbolt arrangement scheme.

为了解决采深不断加大的软岩巷道掘进迎头片帮安全问题,运用岩体力学、材料力学、地质学理论方法研究了软岩巷道掘进迎头片帮机理和巷道掘进迎面墙锚杆布置优化方案。

The method mending by replacing a demaged part for the hading crown of the single wall of No.

文章介绍了莱钢焦化厂2#焦炉燃烧室单面墙吊顶挖补方法。

From use of dry and mortar flag stone, facing wall and other aspects the forms of side slope protection works in highway are introduced as well as their application scope and design key points, which provide good references for roadbed disease prevention and ensure the stability of roadbed.

从干砌片石防护、浆砌片石防护、护面墙等方面介绍了公路边坡工程防护的形式,适用条件及设计要点,从而达到防治路基病害、保证路基稳定的目的。