Materials for external attachments and vessel support welded directly to the pressure retaining parts shall be similar material as the pressure parts. 直接焊接到压力保持部件上的外部配件及容器支架的材料应与压力部件相同。
On the basis of arching effect analysis, the earth pressure against the retaining pile of deep excavation can be divided into two parts: direct and indirect earth pressures. 根据被支护土体中的成拱作用,将间隔布桩时护壁桩侧土压力分为直接土压力和间接土压力两部分。