The utility model discloses a sparse pile and strong anchor supporting structure combined with long and short piles, which belongs to the field of non permanent supporting engineering for foundation pit or slope excavation. The device includes supporting pile, retaining pile, pile top continuous beam, shotcrete surface layer, anchorage cable and self anchoring device. The length of the supporting pile is larger than the length of the retaining pile. The diameter of the retaining pile is not less than the diameter of the retaining pile. The spacing of the supporting piles is uniformly distributed and between two adjacent supporting piles. The soil retaining pile is connected with the pile top continuous beam through the pile top continuous beam. The anchor cable is symmetrically arranged on both sides of the supporting pile and connected with the supporting pile by the self anchoring device. The utility model can effectively reduce the number of resisting soil pressure supporting piles; the working procedure is simple and the construction speed is fast, It has good stability, no need to set up the beam and force path more clearly and more intuitionistic and more reliable; it has a wide range of application and has good economic and practical value.
【技术实现步骤摘要】
一种长短桩结合的疏桩强锚支护结构
本技术涉及基坑或边坡开挖非永久性支护工程领域,特别涉及一种长短桩结合的疏桩强锚支护结构。
技术介绍
在基坑或边坡开挖非永久性支护工程施工中,桩-锚支护结构是目前应用较为广泛的支护体系。通常的做法是:先施工一排等直径、等间距的支护桩,并在支护桩桩顶设置一道连梁;土方开挖至一定深度后,在每相邻两根支护桩桩间均施工一根锚索(杆),然后通过设置于上述一排支护桩桩身靠基坑(或边坡)开挖一侧的腰梁,使用锚具将锚索张拉、锁定;由此,各锚索(杆)与各支护桩连接成了一个整体,再进行下一步土方开挖,直至开挖到设计深度;可根据需要重复设置多道锚索(杆)和多道腰梁。依据相关规范,传统桩-锚支护结构对支护桩嵌固深度和桩间距均有一定的要求:设置一道锚索(杆)时支护桩嵌固深度不宜小于0.3倍基坑或边坡开挖深度,设置多道锚索(杆)时支护桩嵌固深度不宜小于0.2倍基坑或边坡开挖深度;而支护桩桩间距不宜大于桩直径的2倍。该传统的桩-锚支护结构仍存在着如下不足之处:在土质较软弱的地区,为防止桩间土滑塌,需通过减小桩间距、增加支护桩桩数的方法或其它有效措施予以解决,从而造成工程成本的增加;在土质相对较好的地区,因支护桩间土拱效应的存在,支护桩桩间距往往可适当突破2倍桩直径的规定,采用3倍、4倍桩直径甚至更大的支护桩桩间距,支护桩桩间土采用土钉墙进行支护,从而形成一种疏排桩-锚-土钉墙支护结构,该方法较桩-锚支护结构具有一定经济性优势,但土钉墙施工影响土方开挖速度,会增加施工工期,且因支护桩桩间距加大,需设置截面和刚度更大的腰梁,且仅适用于土质相对较好的基坑或边坡 ...
【技术保护点】
一种长短桩结合的疏桩强锚支护结构,包括支护桩、挡土桩、桩顶连梁、喷射混凝土面层、锚索和自锚装置,其特征在于,所述支护桩的桩长大于所述挡土桩的桩长,所述支护桩的直径不小于所述挡土桩的直径,所述支护桩等间距均匀排布,每相邻两根支护桩之间布设若干根所述挡土桩,所述挡土桩与所述支护桩通过所述桩顶连梁连接成一体,所述锚索对称设置于每根所述支护桩两侧并通过自锚装置与支护桩连接,从而构成一个整体结构。
【技术特征摘要】
1.一种长短桩结合的疏桩强锚支护结构,包括支护桩、挡土桩、桩顶连梁、喷射混凝土面层、锚索和自锚装置,其特征在于,所述支护桩的桩长大于所述挡土桩的桩长,所述支护桩的直径不小于所述挡土桩的直径,所述支护桩等间距均匀排布,每相邻两根支护桩之间布设若干根所述挡土桩,所述挡土桩与所述支护桩通过所述桩顶连梁连接成一体,所述锚索对称设置于每根所述支护桩两侧并通过自锚装置与支护桩连接,从而构成一个整体结构。2.如权利要求1所述的一种长短桩结合的疏桩强锚...
【专利技术属性】
技术研发人员:龙照,张恩祥,张森安,曹程明,何腊平,王奇山,郭志元,蒋宗鑫,
申请(专利权)人:甘肃中建市政工程勘察设计研究院,
类型:新型
国别省市:甘肃,62
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