排水工程土方回填施工技術交底記錄.doc

交底內容：
1、在用攪拌樁進行復合地基處理的區域，回填前應挖除攪拌樁樁頂浮土，回填30cm厚砂礫材料，并碾壓密實。
2、填方材料使用現場內開挖的材料，并保證其在規定的含水量狀態下能被壓實到設計規定的密實度。
3、填筑前要對路基、臺背等進行基底清理，保證施工場地能按設計要求進行平整壓實。
4、填土路基必須根據設計斷面分層填筑壓實，其分層填筑厚度必須與壓實機具相適應，一般每層松土填土厚度不應超過30cm。路基填筑壓實寬度不得小于設計寬度，以便最后削坡，嚴禁貼坡。
5、每一壓實層均應檢驗壓實度，合格后方可填筑上一層。否則應查明原因，采取措施進行補壓。檢驗頻率每2000m²檢驗8點，不足2000m²時，至少應檢驗兩點，必須每點都符合施工規范（JTJ071--98）及設計要求。必要時可根據需要增加檢驗點。試驗報告要注明土料種類、試驗日期、試驗結論及試驗人員簽字。未達到設計要求的部位應有處理方法和復驗結果。
6、路基修筑前15天應在取土地點取樣進行擊實試驗，確定其最佳含水量和最大干密度。碾壓前應先測定土的實際含水量是否符合或接近最佳含水量。如果回填土太干燥，應在碾壓前對干土適當灑水加以潤濕；如回填土太濕，壓不密實呈“橡皮土”現象，這時應將“橡皮土”挖出，重新換土再碾壓。
7、回填作業時，先填低洼路段，后填一般路段；先填路中，再逐漸填到路邊。按水平分層逐層填筑，分層碾壓，每層壓實度要達到90%以上。不得順坡鋪填，最大層厚不超過20cm，土塊粒徑≤10cm。
8、碾壓機行走方向應平行路基中線，相鄰作業面的搭接碾壓寬度，平行路中線方向不應小于50cm，機械碾壓不到的部位，應輔以夯實，夯實時應采用連環套打法，夯跡雙向套壓，夯跡搭壓寬度不小于1/3夯位。
9、碾壓時，應遵循先輕后重、先穩后振、先慢后快、先邊后中、先高后低以及輪跡要疊的原則。
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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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