基坑支护可拆型锚杆技术研究及应用

Study and application of technique of removable anchor rod to foundation pit engineering

为了避免给周围后续工程造成施工障碍和引起法律上的纠纷,基坑支护中的临时锚杆在失去作用后应将其拆除。通过对锚杆荷载传递特性的分析和在现场原型试验研究的基础上,提出了一种仅拆除拉杆材料的可拆型锚杆技术。该技术通过在拉杆材料和注浆体之间设置隔离措施来拆卸锚杆,并通过带传力杆的承载体将锚拉力分散传递于注浆体中。工程实例表明该技术方法简单可行,且由于受力合理,可拆型锚杆的技术性能也较普通锚杆明显有所提高。

To avoid making barriers for follow-up engineering and save from a trouble of law, the temporary anchor rods of foundation pit brace should be removed when them have no effects. After some analyses of load transfer behavior of anchor rod, and based on the results of field test, a type of technique of removable anchor for which the pull rod can be removed, is proposed. By setting separation layer between pull rod and slip casting body to remove pull rod, and by setting bearing body with pole to disperse load to slip casting body, this technique is realized. Actual engineering example shows that this technique is easy and feasible. Because of the stress in removable anchor rod is reasonable, its technical characteristics are higher than traditional.anchor rod too.