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1、學(xué)兔兔www.xuetutu.com水利水電技術(shù)第45卷2014年第1期混凝土壩溫控防裂要點(diǎn)的探討劉毅,張國新(中國水利水電科學(xué)研究院流域水循環(huán)模擬與調(diào)控國家重點(diǎn)實(shí)驗(yàn)室,北京100038)摘要:本文提出了特高拱壩和碾壓混凝土重力壩的溫控要點(diǎn):特高拱壩除按規(guī)范要求嚴(yán)格控制基礎(chǔ)溫差外,更要樹立溫度梯度控制的理念,按照“小溫差、慢冷卻、全過程保護(hù)”的要求減小上下層溫差和內(nèi)外溫差;碾壓混凝土重力壩在做好表面保護(hù)的前提下可適3"-放寬對基礎(chǔ)溫差的控制要求。按照信息采集與傳輸、信息管理、仿真分析、預(yù)警預(yù)報、自動控制等五個環(huán)節(jié)建立混凝土壩防裂智能監(jiān)控系統(tǒng),對混凝土壩溫控施工全過程進(jìn)
2、行監(jiān)控,為溫控防裂施工的“可知、可控”提供技術(shù)手段,是未來施工管理的一個發(fā)展方向。關(guān)鍵詞:混凝土壩;溫控防裂;梯度控制;智能監(jiān)控中圖分類號:TV642文獻(xiàn)標(biāo)識碼:A文章編號:1000.0860(2014)01.0077一O8DiscussiononkeypointsoftemperaturecontrolandcrackpreventionofconcretedamLIUYi,ZHANGGuoxin(StateKeyLaboratoryofSimulationandRegulationofWaterCycleinRiverBasin,ChinaInstituteofW
3、aterResourcesandHydropowerResearch,Bering100038,China)Abstract:Thekeypointsofthetemperaturecontrolofconcreteconstructionforsuper-higharchdamandrollercompactedcon—crete(RCC)gravitydamareputforwardherein.Exceptthestrictcontrolofthebasictemperaturedifferenceinaccordancewiththerelevanttechn
4、icalspecifications,theeoncreteconstructionofsuper—higharchdamisfurtherrequiredtoreducethetempera—turedifferencesbetweenupperandlowerlayersandbetweeninsideandoutsideonthebasisoftheprincipleofsmalltemperaturedifference,slowcoolingandwholeprocessprotection.Underthepremiseofdoingthesurfacep
5、rotectionwell,thecontrolre—quirementofthebasictemperaturedifferencecanbeproperlyrelaxedfortheconstructionofRCCdam.Itisadevelopmentorien—tationoftheconstructionmanagementinthedaystocomethataninteligentmonitoringandcontrolsystemisnecessarytobees-tablishedforthetemperaturecontrolandcrackpr
6、evention,thatconsistsofthefivekey—linkssuchasinformationcollectionandtransmission,informationmanagement,simulationanalysis,early-warningandforecasting,automaticcontrol,etc.,forawholeprocessmonitoringonthetemperaturecontrolduringtheconstructionofboththekindsofthedams,andthenprovideaknowa
7、bleandcontrollabletechnicalmeansconcernedaswel1.Keywords:concretedam;temperaturecontrolandcrackprevention;gradientcontrol;inteligentmonitoringandcontrol世紀(jì)以來,碾壓混凝土重力壩以其安全性高、施1引言混凝土壩是我國大壩建設(shè)的主要壩型。我國已建和在建的141座壩高100in以上大壩中,拱壩為收稿日期:20l3·l0一l927座,重力壩46座,6座250in以上大壩中有5座基金項(xiàng)目:國家“973”計(jì)劃課題