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新弃渣场便道施工技术交底
点击率:1 资料整理: 来源:公路造价网 发布人:公路造价-冯 时间:2012-8-20
一、工程概况
(一)、地理位置
新弃渣场便道位于熊家镇楠树村5号弃渣场东侧,沿山脚向山顶方向延伸至垭口,总长度约520米。山垭口由于路堑较深,设有路堑挡墙,长度约100m,高度约4~6米,厚度约1米。(见附图所示)
(二)、工程地质、地貌
地貌为山岭,地形较陡峻。此地段上覆土为红色砂粘土,覆盖层较薄。岩性为浅黄色砂岩、泥岩。
二、设计要点
(一)、本施工便道设计总长为520米,双向两车道,有效路面宽为7米。线路起点接原十五局碎石厂便道,设计最大坡度为15% ,占地约30亩。
(二)、地形地貌
该地区地表为红色砂粘土,覆盖层较薄。岩性为砂岩、泥岩。线路经过多为长河村九组农田及经济果林。便道最大高差为54.33米。由于地形坡度较大,施工车辆均为重车。为满足设计坡度,局部地断开挖方量较大。设计参考四川交通厅公路规划设计院(路基防护工程设计图。)
(三)、属区属亚热带季风气候区,温暖湿润、雨量充沛。
(四)、由于便道的开挖,原村民的通行道路已被破坏,防碍了当地村民的生活及生产。按照村民要求增设通行道路6条,共计180米,埋设管涵一座。
三、施工方法及技术要求
(一)、土方开挖
1、采用挖掘机挖土,自卸汽车弃土,从最低处自下而上逐层进行开挖。开挖时工作面做成微小的横坡,以利排水,堑坡面预留0.5m厚整修层,由人工整修坡面至设计位置。
2、施工注意事项
⑴开挖前,熟悉设计图纸,进行现场核对及施工调查,做好复测、施工测量及横断面检查,布设控制测量桩点。
⑵开挖前,做好截水施工,以拦截地表水,避免雨水冲刷坡面。截水沟与既有排水沟或自然沟相连,避免排入农田形成淤积。
(二)、石方开挖
本工程石方开挖采用弱爆破。
1、 开挖前按要求清理场地,重测地面标高,复核填挖断面和土石方调配图。
2、 按设计要求在路堑外适当位置开挖截水沟,拦截地表水和大气降水。
3、 路堑施工工地布置尽可能增加开挖工作面和运输线,采用高挖高弃,低挖低弃,充分利用和保持装运地势高差,加快装车速度。
4、用7655手持风动凿岩机钻眼布孔,采用间隔装药微差挤压爆破技术,塑料导爆管雷管起爆网络,电雷管起爆,挤压破碎开挖岩体。
5、 进行爆破试验,确定适宜的爆破参数,使每次爆破产生的岩石大小满足装运机械工作要求,每次爆破开挖数量结合机械装运能力,钻眼爆破时间综合确定。
(三)、路基整形
1、路基施工完毕及时进行整型作业,使其与设计图纸相符合,尺寸误差满足规定要求且具有满意的外观。
2、按照设计图纸要求检查路基的中线位置、宽度、纵坡、边坡及相应的标高。
3、对便道表面凸凹不平处进行处理,凹陷部位用与路基表面相同填料填平并夯实。
4、路堑边坡准确整修,使之符合设计要求,坡上松动或突出的石块、危石予以清除,整修后的各项参数符合质量验收标准。
(四)、护坡(挡墙)砌筑
(1) 砌筑时必须拉线,应顺直整齐。在砌筑中应经常校正线杆,保证砌体各部尺寸符合图纸要求。
(2) 浆砌片石砌体严格按挤浆法施工,应错缝搭迭砌筑,空隙用砂浆和碎块石填塞紧密,圬工表面作勾缝处理,墙顶用砂浆抹平。
(3) 砌筑防护工程必须按设计要求每隔10~15m设置宽2~3cm的伸缩缝或沉降缝一道,缝内沿顶、内、外三边填塞深度不小于0.2m的沥青木板。墙身圬工不应有水平通缝,边沟应与墙基同进砌筑,保证两者的整体性。
(4) 砌体应分层砌筑。砌体较长时,分层分段砌筑,两相邻工作段的高度差应不大于1~2m。不同墙身高度之墙顶采用顺坡连接。分段位置应设在沉降缝或伸缩缝处。
(5) 砌体分层砌筑时,每层应大致找平。砌筑上层石块时,应避免震动下层石块。不得在已砌好的砌体上抛掷、滚动、翻动和敲击石块。砌筑工作中断后再进行砌筑时,原砌层表面应加以清扫和湿润,并铺上新浆方可砌筑。
(6) 砌体勾缝前要认真清理缝槽并用水冲洗、湿润。勾缝使用的砂浆标号应比砌筑砂浆高一级。勾缝砂浆均应嵌入砌筑内2cm深。如缝槽深度不足或砌体外露面未留缝槽时,均应先开槽后勾缝。
(五)、排水工程
1、各种形式的边沟、排水沟及截水沟采用人工开挖,沟壁与沟底必须平整坚实,标高与断面尺寸必须满足设计要求。
2、根据设计要求,沟槽的开挖要根据施工图纸和现场的具体情况妥善处理,施工中,应特别注意做好与临近防护的衔接,同时应注意沟形的渐变衔接。
3、浆砌块片石严格按挤浆法施工,片石间应用碎石填塞垫实,砂浆应座满,表面应勾缝处理。
4、浆砌块片石要重视养护工作,砌筑分段完成后,立即进行养护,养护以洒水自然养护为主,一般养护不少于七天。
四、安全质量措施
1、施工前应做好地面的排水工作,开挖过程中排水顺畅。
2、严格按照设计坡度开挖,减少欠挖量,严禁超挖。
3、施工交叉作业时应派专人负责安全工作,防止弃石滚落伤人。
3、机械车辆有专人指挥,以防机械伤人。
4、爆破作业严格按照安全操作规程施工,严禁盲目蛮干。
 
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