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在城区深基坑开挖支护时,其周边往往会遇到密集的建(构)筑物或各种管线设施,这就要求开挖支护过程中应确保支护结构变形控制在很小的容许范围内,以保证周边建(构)筑物及管线设施的安全;且在这种支护空间往往比较狭小,几无放坡空间而需要垂直开挖的基坑中,采用需要大型施工设备的支护桩、地下连续墙等工法往往也是不适宜的。鉴于此,采用直径较小的钢管桩结合预应力锚杆的支护形式对某工程进行了设计施工探讨,经工后监测效果良好,从而验证了这一支护形式的可行性,可供其它类似工程参考。
In the excavation and excavation of deep foundation pit in urban area, the surrounding structures tend to meet with intensive structures (structures) or various pipeline facilities. This requires that the deformation of the support structure be controlled to be small during the excavation and support process Within the allowable range, in order to ensure the safety of the surrounding structures and pipeline facilities; and in such support space is often relatively small, there is no need for grading a few vertical excavation of the foundation pit, the need for large-scale construction Support piles of equipment, underground continuous walls and other methods are often not suitable. In view of this, the use of smaller diameter steel pipe pillars combined with prestressed anchor support form of a project to discuss the design and construction, post-monitoring effect is good, thus verifying the feasibility of this form of support for Other similar project reference.