清淤換填施工技術交底記錄.doc

交底內容：
1、清淤時應先在路基兩側臨時筑堰，抽干積水，再挖除塘底淤泥軟土至原狀土。
2、淤泥軟土清除完畢后，進行砂礫墊層（厚30cm）的施工，接著鋪設土工隔柵，隨后用30cm道渣和30cm素土間隔分層壓實回填至地表面。
3、砂礫材料的最大粒徑應小于50mm，通過5 mm篩孔的粒料應小于35%，粒徑小于0.5的粒料應不大于12%，不均勻系數應小于10%。
4、砂礫墊層的施工采用機械壓實碾壓，將符合要求的砂礫材料經拌和均勻后攤鋪在清理好的基底上。砂礫分層攤鋪，逐層壓實，完工后的砂礫墊層表面不能出現坑洼不平。
5、土工格柵縱橫向拉伸屈服力不小于20KN/M，規格型號為TGSG20—20。
6、土工格柵應沿開挖邊坡鋪至原清表地面，沿路基橫斷面方向反包2m，縱向外翻2m。土工格柵縱向與道路橫向一致，兩幅間搭接采用塑料帶綁扎，綁扎間距25cm，兩幅間搭接寬度大于20cm，并在鋪設的土工格柵上每隔2m用U型釘固定于地面。
7、鋪設完畢的土工格柵應及時回填覆蓋防止日曬老化。施工中禁止施工車輛在土工隔柵上行使，隨時檢查土工隔柵的質量，發現有折損、刺破、撕裂等，視程度或更換，或修補。修補范圍超過裂口至少30cm。
8、鋪設完土工格柵之后，應按照素土——道渣——素土——道渣的順序依次往上回填。
9、道渣碎石料應有良好的級配，最大粒徑小于100mm，通過75mm篩孔的粒料大于90%，小于5mm的細料占20%～40%，石料壓碎值不大于35%。
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Cards on the table contents:
1, dredging should be built first in the embankment on both sides of the temporary weir, pumping out water, and then the soft soil excavation pond sludge to undisturbed soil.
2, after removal of silt soft soil, for sand and gravel cushion (thickness 30cm) of construction, then laying Geogrids, then use the 30cm and 30cm factor ballast layer compacted backfill soil interval to the surface.
3, gravel material should be less than the maximum diameter of 50mm, through the 5 mm sieve of the aggregate should be less than 35% of the aggregate size of less than 0.5 should not exceed 12%, coefficient of uniformity should be less than 10% .
4, gravel cushion construction with mechanical compaction rolling, will meet the requirements of the gravel paving material by mixing in clean-up after even a good substrate. Paving gravel layer, layer compaction, after the completion of the gravel cushion appeared rested on the jagged surface can not.
5, longitudinal and transverse geogrid tensile yield strength of not less than 20KN / M, specification model TGSG20-20.
6, geogrid should be paved along the excavated slope to clear the table the original ground-based cross-section along the direction of anti-package 2m, vertical valgus 2m. Geogrid Vertical and horizontal line the road, between two overlapping plastic with lashing, lashing spacing 25cm, width greater than the overlap between two pieces of 20cm, and geogrid laid on every 2m fixed with U-nails ground.
7, laying the geogrid should be completed in time to prevent the sun and aging backfill cover. Prohibit the construction of the construction vehicles Geogrids exercise, at any time check the quality of Geogrids, found folded, piercing, tearing, etc., depending on the extent or replacement, or repair. Patches covering more than rip at least 30cm.
8, after laying geogrid completed, should be in accordance with the factors of soil - ballast - prime territory - ballast filling up the order.
9, Road slag aggregates should have good gradation, maximum particle size less than 100mm, 75mm sieve the aggregate by more than 90%, less than 5mm of fine material, 20% ~ 40%, stone crushing value is not more than 35%.
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