1．范围
本工艺标准适用于一般工业与民用建筑的基坑、基槽、室内地评、管沟、室外台阶和散水等灰土地基（垫层）
2．施工准备
2.1  材料及主要机具：
1. Range
This technology is applicable to general industrial and civil construction excavation, foundation trench, indoor to comment, trench, outdoor terraces and bulk water dust Foundation (Cushion)
2. Construction preparation
2.1 Materials and main equipment: