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水冲成孔土钉施工技术研究

2021-12-30郭琳琳王吉艳

家园·建筑与设计 2021年3期

郭琳琳 王吉艳

摘要:目前,土钉墙依靠其造价低、施工快且性能可靠等优势在基坑支护中应用较多。其中水冲成孔工艺是土钉墙施工中的一种成孔工艺。水冲成孔工艺与传统的成孔工艺(洛阳铲、螺旋钻等)相比,具有把钻孔过程中的钻进、出渣、固壁、清孔等工序一次性完成,可以防止坍孔,不留残土,确保注浆锚固体直径等优点。通过在中纺小区等工程土钉墙施工中使用水冲成孔的实践,取得了良好的效果,获得了显著的社会效益和经济效益。

关键词:水冲;土钉;锚固体.

Abstract:At present,soil nailing wall is widely used in foundation pit support because of its low cost,fast construction and reliable performance. Water flushing hole forming technology is a kind of hole forming technology in soil nailing wall construction. Compared with the traditional hole forming technology,example Luoyang shovel,auger,etc,the water flushing hole forming technology has the advantages of one-time completion of drilling,slag out,wall consolidation,hole cleaning and other processes in the process of drilling,which can prevent hole collapse,leave no residual soil,and ensure the diameter of grouting anchor. Through the practice of using water flushing to form holes in the construction of soil nailing wall in Zhongfang community and other projects,good results have been achieved,and remarkable social and economic benefits have been obtained.

Key words:Water flush,Soil nailing,anchor solid.

1工藝特点

1.1施工工艺简单,施工过程安全可靠,成孔简单易行。

钻进、出渣、固壁、清孔等工序一次性完成。施工工序少、工艺简单,操作要领易懂且便于掌握,成孔简单易行。

1.2成孔施工设备简单。

水冲成孔施工不需复杂的技术和大型机具,仅手工操作的钻管(钻头由4个L30×3角钢焊制)及胶皮管。

1.3环保节能。

成孔整个施工过程不用耗油。施工作业无噪声,对周围环境干扰小,施工不需要单独占用场地。施工用水循环利用,水质要求不高,可用附近河水(现河水往往水质较差,但完全满足施工用水)及大气降水。

1.4防止塌孔,不留残土,锚固体成型好。

钻进过程中,由于孔内有压力水存在,可防止塌孔,减少沉渣及虚土,保证了成孔质量。注浆后形成的锚固体成型好,易达到设计要求,提高了土钉与土体间的粘结力。

2工艺原理

钻管(由4个L30×3角钢及镀锌钢管焊制改装)钻进时压力水从钻管中心流向孔底,在一定水头压力下,水流携带钻削下来的土屑从钻管与孔壁之间的孔隙处排出孔外。……

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