钢筋插入式预埋波纹管浆锚连接的锚固性能试验研究

为研究预制混凝土结构构件拼装、连接的可靠性,提出一种钢筋插入式预埋波纹管浆锚连接的连接方式。考虑钢筋直径、波纹管外径、锚固长度等参数影响,做了16组共48个施加连续荷载的抗拔试验。试验结果表明:试件最终破坏形式有黏结滑移破坏、钢筋受拉屈服或被拉断两类,没有发生非制作原因引起的黏结滑移破坏,说明此种连接方式锚固性能可靠,且施工操作简单,成型效率高,可应用于预制混凝土结构的拼装、连接。建议插入式预埋波纹管浆锚连接法的钢筋锚固长度宜为15倍的钢筋直径;波纹管外径宜为2倍的钢筋直径。

EXPERIMENTAL STUDY OF ANCHORAGE PERFORMANCE OF GROUTING CONNECTION WITH STEEL BARS INSERTED PRE-BURIED BELLOWS

In order to study the assembling and connection reliability of pre-cast concrete structural components,a grouting connection was proposed with the steel bars inserted pre-buried bellows. Considering of the bar diameter,sleeve diameter,anchorage length,and so on,48 pull out tests of 16 groups were carried out under the continuous load. The results showed that there were two sorts of final failures in the specimens,namely the bond slip failure and reinforced tension yield or being broken,that there was no non-production bond slip failure. It also showed that the connection mode could be applied to assembly and connect pre-cast concrete structures with the reliable anchoring performance,simple construction operation and high efficiency of molding. In this paper,it was proposed that the anchor length of grouting connection should be 15 times of the steel bars diameter and the outer diameter of pre-buried bellows should be 2 times of the steel bars diameter.