排水工程土方回填施工技术交底记录.doc

交底内容：
1、在用搅拌桩进行复合地基处理的区域，回填前应挖除搅拌桩桩顶浮土，回填30cm厚砂砾材料，并碾压密实。
2、填方材料使用现场内开挖的材料，并保证其在规定的含水量状态下能被压实到设计规定的密实度。
3、填筑前要对路基、台背等进行基底清理，保证施工场地能按设计要求进行平整压实。
4、填土路基必须根据设计断面分层填筑压实，其分层填筑厚度必须与压实机具相适应，一般每层松土填土厚度不应超过30cm。路基填筑压实宽度不得小于设计宽度，以便最后削坡，严禁贴坡。
5、每一压实层均应检验压实度，合格后方可填筑上一层。否则应查明原因，采取措施进行补压。检验频率每2000m²检验8点，不足2000m²时，至少应检验两点，必须每点都符合施工规范（JTJ071--98）及设计要求。必要时可根据需要增加检验点。试验报告要注明土料种类、试验日期、试验结论及试验人员签字。未达到设计要求的部位应有处理方法和复验结果。
6、路基修筑前15天应在取土地点取样进行击实试验，确定其最佳含水量和最大干密度。碾压前应先测定土的实际含水量是否符合或接近最佳含水量。如果回填土太干燥，应在碾压前对干土适当洒水加以润湿；如回填土太湿，压不密实呈“橡皮土”现象，这时应将“橡皮土”挖出，重新换土再碾压。
7、回填作业时，先填低洼路段，后填一般路段；先填路中，再逐渐填到路边。按水平分层逐层填筑，分层碾压，每层压实度要达到90%以上。不得顺坡铺填，最大层厚不超过20cm，土块粒径≤10cm。
8、碾压机行走方向应平行路基中线，相邻作业面的搭接碾压宽度，平行路中线方向不应小于50cm，机械碾压不到的部位，应辅以夯实，夯实时应采用连环套打法，夯迹双向套压，夯迹搭压宽度不小于1/3夯位。
9、碾压时，应遵循先轻后重、先稳后振、先慢后快、先边后中、先高后低以及轮迹要叠的原则。
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Cards on the table contents:
1, with mixing pile composite foundation of the region, mixing pile excavation before backfilling the top surface dust, gravel backfill material 30cm thick and compacted dense.
2, use of materials on-site fill material within the excavation and to ensure its state water content in the prescribed design requirements can be compacted to the density.
3, before filling of the foundation, basement, etc. Back of clean-up, to ensure construction site can be formed according to design requirements compaction.
4, the design section must fill embankment dam compaction layer, the thickness of the layer filling and compaction equipment to be adapted, generally should not exceed the thickness of each layer loose soil fill 30cm. Roadbed construction shall not be less than the design width of the width of compaction to the final cut slopes, slope paste strictly prohibited.
5, each compacted layer shall be test compaction, pass on the floor only after filling. Otherwise, to identify causes and take measures to fill pressure. Inspection frequency for each test 8:00 2000m ², less than 2000m ², at least two points should be examined, must conform to construction specifications for each point (JTJ071 - 98) and design requirements. Can be increased if necessary checkpoint. Soil test report should indicate the material type, test date, test findings and the signature test. The site does not meet the design requirements should be handling and retest results.
6, 15 days before the embankment construction sites should take soil samples for compaction tests to determine the optimum water content and maximum dry density. RCC preceded the actual determination of soil water content is consistent with or close to the optimum moisture content. If the backfill is too dry, should be properly compacted soil dry before watering to wet; as backfill is too wet, compaction pressure was not "rubber soil" phenomenon, when the words "rubber soil" dug out, re-for-land re-rolling.
7, filling operations, filling low-lying sections of the general section after filling; filling path, and then gradually fill in the street. Stratified by the level of layer filling, layered, rolled, each layer compaction to more than 90%. Not downslope the filling, the maximum thickness of no more than 20cm, clods size ≤ 10cm.
8, rollers should be parallel to the embankment center line direction of travel of the adjacent working surface of the lap rolling width, parallel to the road center line direction of not less than 50cm, mechanical rolling less than the parts, should be complemented by compaction, compaction should be used comic play set, two-way set of track tamping pressure, take the pressure of tamping track width not less than 1 / 3 ram position.
9, RCC should be followed after the first light weight, after the first steady vibration, the first slow after the fast, the first edges, the first high to low and the wheel track to stack principle.
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