施工技术 2017年7月上 106 CONSTRUCTION TECHNOLOGY 第46卷第13期 D0I:10.7672/8js2017130106 U型干湿井点降水疏干施工技术 徐左屏 (上海智富建设工程有限公司，上海200336) [摘要]为了改善淤泥质粉土、黏土及低渗透性软土降水疏干效果，采用U型干湿井点真空负压降水和常压热风对 流疏干工艺，能有效实现土体前期真空降水、后期常压疏干，热风干湿对流、虹吸蒸发除湿目的.从根本上提高淤 泥质粉土、黏土及低渗透性软土空隙潜水和细颗粒附着水分降水效果，在相同井点数量、间距和真空负压条件下有 效缩短降水周期、改善疏干效果、加快土体固结. [关键词]基坑；降水；U型干湿井点；真空负压降水；施工技术 [中图分类号]TU753 [文献标识码]A [文章编号]1002-8498(2017)13-0106-04 Construction Technique of U-type Dry and Wet Well-point Dewatering XU Zuoping (Shanghai I&F Construction Projects Limited Company Shanghai 200336 China) Abstract:In order to improve the water precipitation effect of mucky clay silt and low permeability of soft soil using U-type dry and wet well vacuum precipitation and atmospheric convection sparse dry process which can effectively achieve the soil pre vacuum precipitation and late atmospheric sparse stem tube dry convection and tube heat steam engine.Fundamentally it can improve the diving and fine particles attached water precipitation effect of mucky clay silt and low permeability of soft soil.If the well point number spacing and vacuum conditions is the same it can effectively shorten cycle of precipitation improve the effect of drainage and accelerate the consolidation of soil. Key words:foundation excavation;dewatering;U type dry and wet well point;vacuum negative pressure precipitation;construction 0引言 真空泵连接实施真空负压降水，又能敞开口部与电 随着轻型井点和深井降水技术的普遍应用，出吹风机连接，实施常压热风对流蒸发疏干.由于U 水量和降水效果越来越被人们所关注，但由于低渗 型干湿井点降水疏干工艺采用双管U形井点构造、 透性软土降水效果受地质土层和土体渗透系数影 大直径双滤管滤水、单枪双...
U型干湿井点降水疏干施工技术.pdf
