实用文档
repairing and expanding the bore wall. The time of each percussion shall not be too long, so as to prevent jamming.
6、换浆
6. Mud fluid displacement
钻孔至设计深度后（一般应大于设计深度的0.5m～1.0m），将钻头提高0.5m左右并加清水稀释，直到泥浆密度接近1.05g/cm3，粘度为18～20s。现场观察一般以换浆后泥浆不染手为准。替浆过程中，应按排泥浆的清运或排放工作。
After drilling to the design depth (normally deeper than the design depth by 0.5m ~ 1.0m), the drilling bit shall be uplifted by about 0.5m and clean water shall be added for dilution till the density of mud reaches 1.05g/cm3 and the viscosity is 18 ~ 20s. For field observation, the criteria is that the mud does not adhere to hands after displacement. During displacement, mud removal or discharge shall be arranged.
7、下管 7. Pipe placement
①、检查井管有无残缺、断裂及弯曲情况。
①Check whether the well pipe is damaged, broken and bent. ②、在波纹管外侧钻孔，孔径不小于20mm并在波纹管外包60目滤网不少于2层。
② Drill bores outside the corrugated pipe. The bore diameter shall be not less than 20mm, and the outside of the corrugated pipe shall be
文案大全
实用文档
wrapped with 60-mesh strainer by not less than 2 courses.
③、使井管居于井孔正中，避免倾斜，并固定。
③ Put the well pipe at the center of the well bore, avoid inclination and fix it.
④、下降第二节井管时，注意连接的公母接口，动作要轻缓，不能猛降猛放。
④ When placing the second section of the well pipe, attention should be paid to the connection of the male and female interfaces. While doing the job, the action shall be light and slow, avoiding sudden placement.
⑤、井管安放应力求垂直并位于井孔中间；管顶部比自然地面高500mm左右。井管过滤部分应放置在含水层适当的范围内。
⑤ Well pipe placement should be vertical and located in the middle of the well as far as possible; the pipe top shall be higher than the natural ground by about 500mm. The filter section of the well pipe should be placed in the proper range of the aquifer.
8、填料 8. Filling material
①、安装完井管后，在无砂滤水井管外侧与井壁之间填砾料。 ① After installing the well pipe, gravel material shall be filled between the outer wall of the filter-free pipe and the well wall.
②、砾料应缓慢填入，防止冲歪井管，一次不可填入过多。接近
文案大全
实用文档
井口1.50m处，用粘土封严，以防地面水、雨水流入。
② The gravel material should be slowly filled to prevent deflection of the well pipe due to flushing. The filling should not be too mush in one time. When it is near the wellhead, clay shall be used for shut-in, so as to prevent the surface water and rain water from in-flowing.
③、井管下入后，及时在井管与土壁间填充砂砾填料。粒径应大于滤网的孔径，一般为3～8mm的细砾石。砂砾滤料必须符合级配要求，将设计砂砾上、下限以外的颗粒筛除，合格率要大于90%，杂质含量不大于3%；填料要一次连续完成。
③ After placing the well pipe, timely fill sand and gravel between the well pipe and the soil wall. The particle size of gravel should be larger than the filter mesh diameter, and it is generally 3 to 8mm fine gravel. Gravel filter material must meet the gradation requirements. The particles larger than the upper limit or smaller than the lower limit of the design gravel size shall be screened off. The rate of conformity shall be higher than 90% and the inclusion content shall not be more than 3%. Filling shall be completed in one time continuously.
9、洗井 9. Well flushing
成井后，用污水泵反复进行恢复性抽洗。洗井应在成井4小时内进行，以免时间过长，影响渗水效果。洗井后可进行试验性抽水，确定单井出水量及水位降低能否满足设计要求。
文案大全
实用文档
After the well is formed, the sewage pump shall be used to repeatedly perform restorative pumping and flushing. Well flushing shall be performed within 4h after the well is formed, so as to avoid being left aside too long and affecting the seepage effect. After the well flushing, test pumping shall be performed to determine whether the discharge of single well and the lowering of optical level can meet the design requirements.
10、安装抽水控制线路
10. Installation of pumping control pipeline
潜水泵在安装前，应对水泵本身和控制系统作一次全面细致的检查。检验电动机的旋转方向，各部位螺栓是否拧紧，润滑油是否加足，电缆接头的封口有无松动，电缆线有无破坏折断等情况，然后在地面上转3～5min，如无问题，始可放入井中使用。深井内安设潜水电泵，可用绳索吊入滤水层部位，上部应与井管口固定。潜水电动机、电缆及接头应有可靠的绝缘，每台泵应配置一个控制开关。主电源线路沿深井排水管路设置。安装完毕应进行试抽水，满足要求后始转入正常工作。
Before installing the submersible pump, the pump itself and the control system shall be subject to a comprehensive and detailed inspection. The following checks shall be made, such as the rotation direction of motor, whether the bolts at various places are tightened, whether lubricant is fully added, whether the cable connection seal is
文案大全
实用文档
loose, whether the cables are damaged or broken, etc. After the checks, run the pump on the ground for 3～5min. It can be put into the well only if it is in good condition. For installing submersible pump inside a deep well, the pump may be lifted to filtration bed level with ropes and the pump top shall be fixed to the well head. The submersible motor, cable and joint shall be provided with reliable insulation and each pump shall be equipped with a control switch. The main power supply line shall be arranged along the drainage pipeline. After installation, trial pumping shall be performed and it shall be transferred to normal operation after satisfying the requirements.
四、降水过程的控制
IV. Control of the drawdown process
1、在正式降水前应作抽水试验，以验证方案的可行性，根据抽水试验结果选择泵的扬程流量，基坑开挖前至停止抽水时止，每天对地下水位进行观测记录，调整抽水速度及抽水量。
1. Pumping test shall be performed before drawdown to validate the feasibility of the scheme. Select the head and flow rate of the pump according to the pumping test. Monitor and record the groundoptical level before the excavation of foundation pit till the stop of pumping every day. Adjust the pumping speed and amount of water being pumped out.
2、在基坑开挖过程中，应随时观测基坑侧壁、基坑底的渗水现
文案大全
管井降水施工方案设计
