Experimental Studies on Penetration of Pulverized Clay-Based Grout

For the geological disposal of high level radioactive wastes, an excavation damaged zone （EDZ） having high hydraulic conductivity resulting from the development of fractures in the rock adjacent to the tunnels will be one of the potential pathways for radioactive contaminant transport. The potential pathways will be sealed by closure components, that is, a combination of tunnel plug, backfill and grout, the latter material being a clay-based mixture in consideration of the need for long-term stability of the seals. Clay-based grout is one of the effective candidate materials that can be used to interrupt the migration of radionuclides through an EDZ. Laboratory testing of clay-based grout using pulverized bentonite, with the objective of improvement in grout penetration into a rockmass, was conducted. The results showed that the pulverization of clay-based grout had a positive effect on filtration.

钢筋套筒灌浆及微重力补浆施工技术应用

预制剪力墙安装多采用钢筋套筒灌浆连接,该连接技术施工工艺直接影响竖向构件节点质量。采用压力注浆法和微重力补浆法两种灌浆工艺相结合的施工方式,可使预制剪力墙的一次灌浆密实度和饱满度的合格率由最初的85.95%提升到95%。文章以某保障房项目钢筋套筒灌浆及微重力补浆施工技术应用经验为基础,重点分析预制装配式结构的钢筋套筒灌浆工艺,总结施工中质量管理措施,对同类项目的管理起到工程指导作用。

装配式预应力混凝土框架结构施工技术

装配式建筑符合绿色建筑发展主题,在建筑领域中有广泛的应用,结合工程实例,介绍了装配式预应力混凝土框架的设计特点和施工技术特点,并给出了预制柱、梁、节点和板等构件的施工全过程。装配式预应力混凝土框架结构施工技术的应用,有效的降低了施工成本,缩短了施工工期,取得了良好的效果。

预制剪力墙优化灌浆及微重力流补浆技术应用

预制装配式结构施工中,为加强灌浆的质量控制,解决套筒灌浆不密实的情况,研发了预制剪力墙优化灌浆及微重力流补浆技术,采用BIM技术对预制剪力墙灌浆结构进行优化,再利用观测孔与弯联管连接,对套筒内进行灌浆料的超灌,连接管内的灌浆料在自身重力的影响下,对套筒内部空腔位置进行补浆,实现了对内部套筒灌浆的密实度保障,提高了预制剪力墙施工的可靠性。