The invention provides a construction method of a foundation pit supporting water stop continuous wall. In the foundation pit, there are three-axis mixing piles overlapping and supporting piles arranged according to the fixed spacing and the same axis, and the reinforcement structure is set to form a continuous wall. The three-axis mixing piles are overlapped to form a three-axis mixing wall. The supporting pile is a supporting pile constructed on the central line of the three-axis mixing wall after the completion of the construction. The three-axis mixing pile and the supporting pile are the same axis, and the diameter of the supporting pile is larger than the diameter of the mixing pile and is equipped with a reinforced structure. The support pile is constructed by using high-power long spiral drilling machine and rotary drilling machine. The combination of foundation pit support and water stop is adopted to form a continuous underground wall with certain strength and rigidity, continuous integrity, no joint water retaining and anti-seepage. The structure is simple and reliable, with strong water retaining and anti-seepage performance, simple structure, low cost and small environmental pollution, which is especially suitable for deep foundation pit engineering in the city. It is suitable to be used as a construction method of water stop continuous wall for foundation pit support.
【技术实现步骤摘要】
一种基坑支护止水连续墙的施工方法
本专利技术提出的是建筑领域地下基坑连续墙的施工方法,主要应用在水泥土搅拌桩墙,具体地说是一种基坑支护止水连续墙的施工方法。
技术介绍
目前,基坑止水帷幕的常规施工是先做支护桩再做止水墙,一般净距200mm,而不是同一轴线上,存在以下缺点:支护桩间土在开挖时,容易脱落,影响支护效果;支护桩间土需要进行锚喷处理;锚索孔渗水时,漏水点不易被找到,封堵困难;支护桩在挡土过程中产生的变形,易将止水墙压裂而渗水。SMW工法连续墙是三轴型钻掘搅拌机就地钻进切削土体,同时在钻头端部将水泥浆液注入土体,经充分搅拌混合后,在各搅拌桩间采取重叠搭接施工,在水泥土混合体未结硬前再将H型钢或其他型材插入搅拌桩体内,形成连续墙体,特别适合于以粘土和粉细砂为主的松软地层,只适合地质条件好、开挖深度在7-10m的基坑施工。
技术实现思路
为了解决地下基坑连续墙的结构强度和挡水防渗的问题,本专利技术提出了一种基坑支护止水连续墙的施工方法。该通过三轴搅拌桩做止水结构和支护桩做强度结构,解决地下基坑连续墙的技术问题。本专利技术解决技术问题所采用的方案是:在基坑中设有重叠搭接的三轴搅拌桩和按照定间距同轴线排列的支护桩并设置钢筋结构形成连续墙体。所述三轴搅拌桩重叠搭接形成三轴搅拌墙,采用三轴搅拌桩机施工进行基坑的止水帷幕,三轴搅拌桩桩径¢650mm,桩间距0.9m,按跳槽式双孔全套复搅式连接施工,桩长进入强风化岩不小于1.0m。三轴搅拌桩采用42.5级的普通硅酸盐水泥,水泥掺量不小 ...
【技术保护点】
1.一种基坑支护止水连续墙的施工方法,其特征是:在基坑中设有重叠搭接的三轴搅拌桩(1)和按照定间距同轴线排列的支护桩(2)并设置钢筋结构形成连续墙体。/n
【技术特征摘要】
1.一种基坑支护止水连续墙的施工方法,其特征是:在基坑中设有重叠搭接的三轴搅拌桩(1)和按照定间距同轴线排列的支护桩(2)并设置钢筋结构形成连续墙体。
2.根据权利要求1所述的一种基坑支护止水连续墙的施工方法,其特征是:所述三轴搅拌桩重叠搭接形成三轴搅拌墙,采用三轴搅拌桩机施工进行基坑的止水帷幕,三轴搅拌桩桩径¢650mm,桩间距0.9m,按跳槽式双孔全套复搅式连接施工,桩长进入强风化岩不小于1.0m,三轴搅拌桩采用42.5级的普通硅酸盐水泥,水泥掺量不小于20%,土的重度按1.9T/m3综合考虑,水灰比宜采用1∶1,水泥土墙体的28d无侧限抗压强度不小于0.8Mpa;施工过程中因超时无法搭接或搭接不良,采取在搭接处补做搅拌桩技术措施进行冷锋处理...
【专利技术属性】
技术研发人员:于贵,王禹,张云峰,李明伯,张扬,李超,李龙,
申请(专利权)人:辽宁省有色地质一〇五队有限责任公司,
类型:发明
国别省市:辽宁;21
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