一、 施工准备
1、 材料
无砂混凝土管(滤管)、滤网、2～4mm砂砾混合料、潜水钻机、泥浆车、泥浆泵、清水泵、潜水泵等。
2、 作业条件
（1） 现场三通一平已完成。
（2） 地质勘测资料齐全，根据地下水位埋深、土层分布和基坑放坡系数，确定井点位置、数量和降水深度。
二、 工艺流程
井点测量定位→挖井口→安护筒→钻机就位→钻孔→回填井底砂垫层→吊放井管→回填井管与孔壁间的砾石过滤层→洗井→井管内下设水泵、安装抽水控制电路→试抽水→降水井正常工作→降水完毕拔井管→封井
三、 操作要点及技术要求
1、 定位：根据设计的井位及现场实际情况，准确定出各井位置，并做好标记。
2、 采用循环钻成孔，孔径一般为600～800mm，用泥浆护壁，孔口设置护筒、，以防孔口

First, construction preparation
1, material
No sand concrete pipe (filter tubes), filter, 2 ~ 4mm gravel mixture, diving rig, mud truck, mud pump, water pump, submersible pumps.
2, working conditions
(1) Field leveling has been completed.
(2) Geological Survey data are complete, according to groundwater depth, soil distribution and Pit Slope coefficient, determine the location of wells, amount and precipitation depth.
Second, process
Well I dug the well measured orientation → → → On casing drilling rig in place → → → backfill pit sand cushion → dipping tube wells tube wells and bore backfill the wall of a gravel filter layer → washing → Well well consists of pipe pumps, installation of pumping test pumping control circuit → → → precipitation of Wells finished work pulling well pipe → Capping
Third, the operation points and the technical requirements
1, position: According to the design of the wells and the field situation, accurately determine the well location, and well marked.
2, with circulation drill hole, aperture is generally 600 ~ 800mm, with the Slurry Wall, orifice setting casing, to prevent the orifice