DIKGATLHONGDAMPROJECTCONTRACTNO.1:DAMANDASSOCIATEDWORKSANDACCESSROAD大坝监测仪器施工方案(振弦式渗压计)批准:审核:编制:SINOHYDROCORPORATIONLTD.November18th2008大坝监测仪器施工方案(振弦式渗压计)一、工程简介迪克戈洪大坝工程的观测项目主要有:水位及地下水位观测、坝体表面观测渗流观测、空隙水压力观测。其主要观测仪器和设施如下:No.DescriptionUnitQuantityRemark1Supplyingandinstallingarmouredcablesm44002Constructingprotectivesurroundstocablesm1,1003Drillingholesintodamfoundationforelectricdiaphragmpiezometersm2954SupplyingandinstallingelectricdiaphragmpiezometersNo.485SupplyingandinstallinginstrumentterminalboxesNo.46SupplyingportablereadoutunitLumpSum17CrestsettlementpointsNo.508Standpipepiezometersm5509ConstructionofprotectivecovertoStandpipepiezometersNo.1810SupplyingelectricdepthmeasuringinstrumentLumpSum111FurnishingandinstallingseepagemeasuringweirplatesandheadmeasuringplatesNoofChambers5各种仪器将跟随工程的进展而进行安装,其中渗压计分为振弦渗压计和竖管渗压计,振弦渗压计具体分布部位和工程量见下表:No.SectionUnitQuantityRemark1CH3650No.142CH3450No.123CH3850No.124CH2800No.105合计No.48二,供货商资料该工程的监测仪器供货商为基康北京公司,该公司的详细资料如下:GeokonINC.ofUSAhasbeentheworldleaderinhigh-qualitygeotechnicalinstrumentsdesignandmanufacturingsinceitwasfoundedin1979.GeokoInstruments(Beijing)co.,Ltd.wasfoundedin1998asawholly-ownedenterprisesoftheGeokonInc.,whichspecializedindesing,productionandsaleofsecuritymonitoringinstrumentsandautomaticmonitoringandcontrolsystems,theintegrationprojectsandthetechnologicalconsultationandservicesaswelland“chinaIndustrialproductionpermit”Geokoninstrumentsaredividedintotwolargeseriesofvibratingwires(vw)andFiberBraggGratings(FBG),widelyusedformonitotingsecurityandstabilityofhydraulicstructures,tunnels,brdges,highwaysandotherprojects,suchasstress,strain,displacement,load,pressure,temperature,tilt,settlementanddataacquisition,etc.Asamemberofchinadamsecuritymonitoringcommittee,GeokonInstruments(Beijing)Co.,Ltd.Isoneofthemostprestigiouscompaniesmajoredinhydropowerprojectsecuritymonitoringandthelargestsupplierofwaterconservancyandhydropowersecuritymonitoringinstrumentsinchina.GeokonBeijingCo.JiangxiaoqangUnit1111GeneralManagerTianchuangScienceplazaMr.G.J.LiNO.8CaihefangRoadSalesDirectorHaidianDistrictTel:+86-10-62698899BeijingFax:+86-10-62698866100080geokon.com.cnChinageokon.cn/en三、施工计划根据安全监测的特点,坝内观测仪器,设备及观测等随坝体填筑施工的项目同步进行。根据总体计划安排,CH3+650和CH3+450断面EL864.00以下的振弦渗压计在2009年9月29日以前完成安装;CH3+850断面EL864.00以下的振弦渗压计在2009年7月15日以前完成安装;CH2+800断面的渗压计在2010年5月31日以前完成安装.四、GK-4500振弦式渗压计安装方法1、基础渗压计安装现场安装前将率定合格的渗压计浸泡在净水中以排出感应端的空气,然后用纱布、细砂将渗压计感应端包裹并浸入水中达到饱和状态以备安装。测量放点,进行钻孔,孔径为φ100,钻孔深度为渗压计预定位置以下15~30cm,并对钻孔进行清洗。孔底部用干净的细沙填充至渗压计端头以下15cm的位置,即可放入渗压计,在放入之前先将渗压计封装在一个沙袋里,保持干净,然后放入,并在电缆上做好标记,待仪器就位后环绕周围填充干净的砂子,填充高度在渗压计以上15cm。采集区砂子回填后对孔进行密封,具体做法是先填充500mm厚的膨胀土,然后在用水泥浆填至孔口位置。孔密封后渗压计电缆周边回填粒径最大不超过5mm的1A料,并掺入10%的膨胀土(体积比),回填高度为300mm至电缆沟底部,渗压计电缆从电...