水泥砼路面板真空灌浆技术的应用

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1、水泥砼路面板真空灌浆技术的应用水泥混凝土路面在我国已有多年的使用历史 , 是我国公路路面主要形式之一 , 在我国公路网构成中占有较大比重。它具有强度高、刚度大、受温度影响小、使用寿命长等优点。但水泥混凝土路面接缝较多, 对超载较为敏感 , 易发生脱空、唧泥、裂缝等先期病害 ,从而导致路面的破损。如何治理与预防脱空、唧泥等病害,搞好水泥混凝土路面的养护 , 延长公路的使用寿命 ,改善其通行能力 ,具有十分重要的意义。Cement concrete pavement in our country has many years of history,is one of the main forms

2、of the highway pavement in our country, in ourcountryhavealargeproportioninhighwaynetwork.Ithastheadvantages of high strength, high rigidity, little affected by temperature,long service life etc. But the cement concrete pavement is more, moresensitive to the overload, prone to separation, mud, crack

3、s early disease,leadingtoroaddamage.Howtocontrolandpreventseparation,pumpingdiseases,improvetheconservationofcementconcretepavement, prolong the service life of the road, to improve its capacity,has a very important significance.随着近年来我国现有的水泥混凝土路面有相当一部分已接近或超过设计年限 ,水泥混凝土路面最严重的病害路面板的断板直至破碎, 而这种情况往往是由于板

4、下脱空所引起的。对此板下灌浆技术是很有效的解决办法 ,它通过对水泥混凝土路面板下灌注水泥浆液、水泥粉煤灰浆液、水泥砂浆 ,充实板底脱空空隙 ,达到稳定水泥混凝土板块的目的 ,改善路面通车状况的方法。In recentyears,ourcountryexistingcementconcretepavementhave quite one part has been close to or exceed the design life, brokenuntilthecrushingplateslabof themostseriousdiseasesofcementconcrete pavement

5、, and this situation is often caused by void beneathslab. This board grouting technology is a very effective solution, whichbased on the cement concrete pavement cement slurry, cement and flyash slurry,cementmortar,enrichtheslabvoidvoid,stablecementconcrete plate, to improve the pavement condition.一

6、、灌浆加固机理The mechanism of grouting reinforcement,灌浆法是指利用液压、气压或电化学原理,通过注浆把浆液均匀地注入地层中 ,浆液以填充 ,渗透和挤密等方式 , 赶走土颗粒间或岩石裂隙中的水分和空气后占据其位置 ,经一定时间后 , 浆液将原来松散的土粒或裂隙胶结成一个整体,形成一个结构新、强度高、防水性能好和化学稳定性良好的“结石体。Groutingmethodistheuseofhydraulic,pneumaticorelectrochemicalprinciple,throughgroutingtheslurryevenlyintotheforma

7、tion,the slurryto filling,permeabilityand compactionmethod,getridofsoilparticlesorrockfissurewaterandairtooccupytheposition, after a certain period of time, slurry will be the original loosesoil particles or fissure cemented into a whole, the formation of a newstructure,highstrength,goodwaterproofpe

8、rformanceandgoodchemical stability stone.二、真空灌浆技术需要注意的问题Note two, the vacuum grouting technology problems1. 真空灌浆技术是后张预应力混凝土结构施工中的一项新技术,在我国应用比较少 ,缺乏相应的技术依据 , 同时真空灌浆施工需要有较高水平的质量控制。因此 ,需要结合现有的施工材料和设备 ,摸索能够符合预应力施工质量要求而又切实可行的施工工艺。1 vacuum grouting technique is a new technique of post-tensionedprestressed

9、concretestructureconstruction,applicationinChinaisrelativelysmall,thelackoftechnologyonthebasisofthecorresponding,and vacuumgroutingconstructionrequiresa higherlevel ofqualitycontrol.Therefore,requiresa combinationofconstructionmaterialsandequipmentavailable,gropingtomeettheconstructiontechnologyofp

10、restressedconstructionqualityrequirements and practical.三、真空灌浆技术的基本流程Three, the basic process of vacuum grouting technology1 、浆体配比设计1, the slurry mixture ratio design这种高性能水泥浆与普通水泥浆相比,在原材料的配比方面主要差异为低水灰比和多成份 , 其目的是为了增加水泥浆的密实度,改善水泥浆性能 ,从而达到高强和耐久的目的。Thishighperformancecementslurrycomparedwithordinarycem

11、entslurry,themaindifferencesin theratioof raw materialsandcomponents for low water cement ratio, the purpose is to increase thecompactnessofcementslurry,improvetheperformanceofcementslurry, so as to achieve the purpose of high strength and durable.水泥浆试块采用70.7 70.7 70.7mm的钢模型 , 在常温下 24h后拆模 ,进行试验室养护。

12、试验结果表明 : 水灰比琥小 ,强度越高 ,用 525# 普硅水泥 7 天强度最大达到 78MPa, 大大超过所要求的强度。 改选用 425# 普硅水泥 ,7 天强度最大达到 55MPa 以上 ,因此 ,选用 425# 普硅水泥即可达到要求。Cement test block with 70.7 * 70.7 * 70.7mm steel model, the 24hin normal temperature, for the laboratory maintenance. The test resultsshow that: the water cement ratio, small, hi

13、gher strength, using 525#ordinary portland cement 7 days strength up to 78MPa, far more thanthe required strength. Instead of using 425# ordinary portland cement,7daysstrengthupto55MPaabove,therefore,selectionof425#ordinary portland cement can reach the required.2 、真空灌浆施工工艺2, the vacuum grouting tec

14、hnology(1) 预应力筋成孔管材(1) prestressing tendon hole pipe预应力混凝土构件中有采用直束、弯曲和U 型束等的布筋方式 ,金属波纹管在预应力筋管成孔方面不能满足小半径的弯曲及U 型束的布筋要求 ,故采用新型成孔材料塑料波纹管。与金属波纹管相比 , 在强度和耐腐蚀方面 ,有更好的保护作用。A straightbeam,U beambendingandthearrangementwaysofreinforcementofprestressedconcretestructures,metalcorrugatedpipe in prestressed pipe

15、 into the hole can not meet the reinforcementcurved and U type small radius of the beam requirements, so the use ofthe new hole materials - plastic corrugated pipe. Compared with metalcorrugated pipe, corrosion and strength, has a better protective effect.(2) 施工步骤(2) the construction steps首先 ,准备工作Fi

16、rst of all, to work检查确认材料数量 ,种类是否齐备 ,品质是否保证 ;Thecheckthenumberofmaterials,varietyis complete,qualityassurance;检查机具是否齐备、完好;Check equipment is complete, intact;检查供水、供电是否齐全、方便;Theexaminationofwatersupply,powersupplyiscomplete,convenient;按配方秤量浆体材料 ,减水剂首先溶于一部分水,待用 ;According to the formula weighing paste

17、 material, first dissolved ina portion of the water reducing agent, stand-by;按图所示连接装好各部件。 as shown in connection with each component.第二 ,试抽真空 : 将灌浆阀、排气阀全都关闭,抽真空阀找开 ;启动真空泵抽真空 ,观察真空压力表读数 ,即管内的真空度 ,当管内的真空度维持在时 (压力尽量低为好 ),停泵约 1 分钟时间 , 若压力能保持不变即可认为孔道能达到并维持真空。Second, try to vacuum: the filling valve, exha

18、ust valve are closed, a vacuum valve open; start the vacuum pump, vacuum gauge pressure isobserved,thevacuumtube,whenthevacuumtube(pressurewasmaintained at a time as low as well), stop the pump for about 1 minutes,if the pressureto remainconstantcan be consideredto achieveandmaintain a vacuum channe

19、l.(3) 搅拌水泥浆(3) mixed with cement paste搅拌水泥浆之前要求, 加水空转数分钟 , 将积水倒净 , 使搅拌机内壁充分湿润。搅拌好的灰浆要做至基本御尽。Before the stirring cement slurry, water air revolutions per minute,the water down the net, make wall fully wet mixer. Ready mixed mortarto do to do basic royal.装料 :首先将称量好的水 (扣除用于溶化减水剂的那部分水)、水泥、膨胀水泥、粉煤灰倒入搅拌机

20、,搅拌 2 分钟 ;将溶于水的减水剂倒入搅拌机中,搅拌 3 分钟出料 ; 水泥浆出料后应尽量马上进行泵送,否则要不停地搅拌;必须严格控制用水量 ,否则多加的水全部泌出,易造成管道顶端有空隙; 对未及时使用而降低了流动性的水泥浆 ,严禁采用增加水的办法来增加灰浆的流动性。Thecharge:firstly,weighingwellwater(deductedformeltingreduction that water agent), cement, expansive cement, fly ash into themixer, stirring for 2 minutes; will diss

21、olve in water reducing agent intotheblender,stir3minutesoutofmaterial;cementslurryafterdischarging,shouldtrytohorseonpumpingotherwise,stirringconstantly;usingwatermustbestrictlycontrolled,oraddwatersecretion,easytocausepipelinetopgap;failuretotimelyuseandreducethecementpastefluidity,noliquiditybyadd

22、ingwatertoincrease the mortar.(4) 灌浆(4) grouting将灰浆加至灌浆泵中, 在灌浆泵的高压橡胶管出口打出浆体, 待这些浆体浓度与灌浆泵中的浓度一样时, 关掉灌浆泵 ,将高压橡胶管此端接至孔道的灌浆管上 ,扎牢。The mortar to the grouting pump, export hit slurry in high pressurerubber tube grouting pump, the density of the slurry concentration andgrouting pump of the same, turn off t

23、he grouting pump, high pressurerubber tube connected to the end of duct grouting pipe, fasten.关掉灌浆阀 ,启动真空泵 ,当真空度达到度维持在 -0.06-0.09MPa值时 ,启动灌浆泵 ,打开灌浆阀 ,开始灌浆 ,当浆体经过空气滤清器时,关掉真空泵及抽气阀 ,打开排气阀。 off filling valve, start the vacuum pump, when the vacuumdegreereachesdegreemaintainedat-0.06-0.09MPa,startthegrou

24、ting pump, open the filling valve, start filling, when the slurry afterthe air cleaner, turn off the vacuum pump and the air valve, open theexhaust valve.观察排气管的出浆情况,当浆体稠度和灌入之稠度一样时, 钢塑土工格栅关掉排气阀 ,仍继续灌浆 2 分钟 ,使管道内有一定的压力 ,最后关掉灌浆阀。The observationof theexhaustpipeof the pulp,whenthepulpconsistency and pou

25、red into the consistency of the same, turn off theexhaust valve, is still filling 2 minutes, so that the pipe has a certainpressure, and finally turn off the filling valve.(5) 清洗(5) cleaning拆下抽真空管的两个活接,卸下真空泵 ; 拆下空气滤清器和灌浆胶管, 清洗灌浆泵、搅拌机、阀门、空气滤清器以及粘有灰浆的工具。Removethetwopumpingvacuumtubeismovablyconnected,

26、remove the vacuum pump; remove the air cleaner and grouting hose,cleaninggroutingpump,mixer,valves,air filterand adhesivemortartool.四、质量控制要点Four, quality control points(1) 钻孔定位。要根据施工现场的实际情况丙烯酸聚氨酯,不断总结经验 ,尽量把孔位设在脱空深度最大处 ,每块水泥混凝土板应钻 45 个孔。(1) the drilling location. According to the actual conditions o

27、f construction site, constantly sum up experience, as far as possible theholes are located in the cavity depth and the maximum, each cementconcrete board drill holes should be 45.(2) 灌浆。(2) grouting.严格控制进场材料的质量,确保达到要求 ;Strictly control approach material quality, to ensure that meet therequirements;严

28、格控制配合比 ,各种材料计量准确 , 且拌和均匀 , 注重用水量 ;Strictcontrolofmixtureratio,variousmaterials,accuratemeasurement, and mixing evenly, with emphasis on water;灌浆时若发现灰浆已从压过或未压过的孔溢出时, 应及时用木塞塞紧,10min后拔出木塞 ;The groutingmortarif foundfromholeoverflowpressureor notcrushed, timely stopper to stuff, cork pulled out after 10

29、 min;灌浆机压力达到015110MPa 或水泥灰浆从其它孔溢出或从边缝、裂缝等处溢出时 ,将自动停机或人工停机 ,视为压满 ;The grouting pressure machine to 015110 MPa or cement mortarfromtheotherholeoverfloworfromthesideseams,crackswilloverflow,automaticshutdownor manualshutdown,as pressureoverthe;交通控制 ,灌浆完成后的板块 , 禁止车辆通行 ,待灰浆强度大于3 MPa以上时方可开放交通。The traffic

30、control, grouting after the completion of the plate, a banon vehicle traffic, the mortar strength is larger than 3 MPa shall be opento traffic.灌浆技术作为一种新型的加固技术,可广泛地使用到公路施工其他方面, 如:高速公路桥头跳车、 软土地基处理、 机场路加固等。 山东太阳能而且由于其处治质量主要控制指标弯沉与旧板加铺沥青混凝土面层的设计指标相吻合,具有一定科学性 ,所以也适用于旧板加罩沥青面层的加固处治。Groutingtechnologyisa ne

31、w reinforcementtechnology,canbewidelyusedinhighwayconstructionof otheraspects,suchas:bridgehead inhighway,airport roadfoundationtreatment,softsoilreinforcement. And because the design index of the treatment qualitycontrolindex-old platedeflectionand asphaltconcreteoverlaycoincide,whichis scientific,

32、so it is suitableforthe old plateandreinforcement asphalt surface layer.总之 ,由于真空灌浆施工工艺本身有较高水平的质量控制,加上采用合理配比的混合材料 ,采用真空灌浆技术将能保证孔道灌浆的均匀性,能形成一个密实、不透水的保护层 ,并能消除孔隙。蒸汽冷凝水回收机另外,塑料波纹管是绝缘体 ,与金属波纹管相比 ,具有更强的耐腐蚀性 ,大大改善了构件的防腐蚀性能。因此真空灌浆技术是确保高质量灌浆的一个强有力的手段。In short, due to the quality control of vacuum grouting te

33、chnologyitself has a higher level, combined with a reasonable proportion of themixture, the vacuum grouting technology will be able to guarantee theuniformityof theductgrouting,canformadense protectivelayer,waterproof,andcaneliminatethepores.In addition,theplasticcorrugated pipe is an insulator, compared with metal corrugated pipe,has strongercorrosionresistance,can greatlyimprovethe corrosionresistance of the component. So the vacuum grouting technology is apowerful means to ensure the high quality of grouting.