天津市市政工程管道工程砂石基礎技術交底記錄.doc
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交底內容：
交底部位：工程起點—W2
1、 溝槽經驗收合格后，回填土石硝至差250mm到設計標高，分層夯實。按設計要求，鋪設3.0米寬，0.25米厚，直徑為2~25mm的級配碎石，再鋪設20mm的粗砂，此時，砂石基礎標高高于設計標高20mm，備于管道自沉降。
管底必須與砂石平基及管座緊密接觸，石子與管皮不得直接接觸，施工期間，槽底不準受水浸泡，平基厚度允許偏差為±20mm之間。墊層厚度不得小于設計規定。
Cards on the table contents:
Cards on the table position: Project start-W2
1, trench after their acceptance, poor backfill debris nitrate to 250mm to the design elevation, hierarchical compaction. According to the design, the laying of 3.0 meters wide and 0.25 m thick with a diameter of 2 ~ 25mm graded crushed stone, and then laying 20mm of coarse sand, this time, based on elevation higher than the design elevation gravel 20mm, prepared in the pipeline from the settlement.
Sand pipe end must be in close contact Dan Pingji and seat tube, gravel and pipe shall not direct contact with skin, the construction period, are not allowed to be immersed in water bottom, flat base to allow deviation of ± 20mm thickness between. Cushion thickness of not less than the design requirements.