《南水北调与水利科技》：超深灰浆墙泵送置换法施工技术（程瑞明,怀小刚,张健,李荣智）（摘要）

摘要：南水北调中线一期穿黄工程北岸竖井外围灰浆防渗墙设计墙厚0.8m、墙深71.6m，成墙工艺由原设计的自凝成墙工艺改为泵送置换成墙工艺，施工时采用液压抓斗或液压铣槽机成槽，重锤法检测成槽质量，气举法清孔后，采用泥浆泵抽出槽孔中的泥浆到搅拌站并加入水泥、河砂搅拌后形成比重较大的灰浆，采用泥浆泵和导管将比重大的灰浆压到槽孔底部，利用泥浆和灰浆的比重差置换成墙，成功建成国内第一道超深灰浆防渗墙。着重介绍了施工选用的设备与机具、灰浆材料与灰浆配合比和泵送灰浆置换成墙施工工艺。

关键词：穿黄工程；超深灰浆墙；泵送置换；施工技术

中图分类号：TV68；TV52 文献标识码：B 文章编号：1672-1683（2008）01-0324-04

The construction technique of pump feeding replacement in the mortar wall with super depth

CHENG Rui-ming,HUAI Xiao-gang,ZHANG Jian,LI Rong-zhi

(Tunnel Co.Ltd of China Railway Engineering Group Co.Ltd,Xinxiang 453000,China)

Abstract:In the first stage of Middle Route in the South-to-North Water Transfer Project,there is an anti-seepage wall with mortar outside on the north bank of the Yellow river crossing Project.The designed thickness of the wall is 0.8 m and depth is 71.6 m.The construction method of the wall was changed to pump feeding replacement from self-concreting as originally designed.The hydraulic grab bucket or the horizontal multi-axis driller is adopted to make the channel,and heavy plummet is used to check the quality and then compressed air is used for cleaning.The slurry sucked out by the pump is sent to the mixing station and becomes the mortar with larger proportion by adding cement and sand.Next the mortar is sent back to the bottom of the channel by pump and pipes and forms the wall by the differences between slurry and mortar in proportion.In this way,the first anti-seepage mortar wall with large depth was built successfully.It is emphasized the equipments and tools in the construction.grouting material,concrete ratio,and pump feeding replacement techniques.

Key words:Yellow rive crossing project;mortar wall of super depth;pump feeding replacement;construction techniques

参考文献：

[1]寇晶.自凝灰浆防渗墙在三峡围堰中的应用及成本分析[J].西部探矿工程，2004，16（3）：200-201.

[2]阮文军，黄晓平，牛丽满.特大深基坑自凝灰浆挡水帷幕技术[J].长春工程学院学报（自然科学版），2004，5（2）：5-8.

[3]DL/T5199-2004，水利水电工程混凝土防渗墙施工规范[S].

作者简介：程瑞明（1974-），男，河南新乡人，工程师，主要从事隧道及地下工程施工技术管理工作。

来源：《南水北调与水利科技》2008年第1期