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弃碴便道排水沟及集水井技术交底
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、   适用范围
     为解决弃碴便道排水畅通,在弃碴便道内侧增设矩形排水沟,在明沟接口处设集水井一座。
      二、   施工方法及技术要求
1. 开挖到设计尺寸后,要清除排水沟和集水井开挖表面的虚土杂物。开挖后及时浆砌,防止土体坍塌,作好防护工作。
2.石料采用颜色一致、不宜风化、无裂隙、密实、强韧、坚固耐久;使用前应进行实验,其抗压强度不小于30Mpa的条石,其厚度为200~300mm,宽度及长度应为石料厚度的1~1.5倍和1.5~3倍。
3. 所有垂直于外露面的镶面石的表面应修凿,其表面凹陷深度不的大于20 mm。
4.石料不得含有妨碍砂浆的正常粘结或损坏外漏面外观的污泥、油脂和其他有害物质。
5. 所有石块应做于新拌砂浆之上,在砂浆凝固前,所有缝应满浆。
6.  石料均应按层砌筑,各段水平砌缝应一致。
7. 在砂浆凝固前应将外露缝勾好,勾缝深度不小于20 mm,所有灰缝应填满砂浆。
8.勾好缝的砌体在完工后,在7~14d内应加强养护。
9.条石砌体应成行铺砌,并砌成大致水平层次,任何层次石块应与领层石块搭接至少80 mm,砂浆砌筑平缝宽度应不大于30 mm,竖缝宽度不应大于40 mm。
10.根据排水沟和集水井的受力性能采用7.5号水泥砂浆砌筑块石,10号砂浆勾缝。
11.基底应置于满足承载力要求的地基上,基底逆坡应符合设计要求,以保证墙身稳定。
12.排水沟应根据地形及地质变化情况设置沉降缝,间距一般为10~15m,缝宽2cm,沉降缝内用沥青麻、絮。
13.两便道交叉口预埋φ100cm混凝土排水管。
       三、   施工图纸
      四、安全及质量措施:
     1、施工前应做好地面排水工作,基坑开挖过程中及时分段砌筑的办法施工,不得全段开挖,以免在挡土墙完工以前发生土体坍塌。
     2、施工交叉作业时应专人负责安全工作,防止弃石滚落伤人。
     3、排水沟和集水井的底部、顶部和墙面外层应用整齐的大块石砌筑,保证其规格一致。
     4、墙址处的基坑在墙身砌筑一定高度后及时回填夯实,并做成外倾斜坡,以免积水下渗,影响墙身的稳定。
     5、弃土需待砂浆强度达70%以上后方可进行。强度及标号应符合设计要求。
     6、如果在施工过程中出现安全、质量事故一切后果自负。
          
 
 
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