问人工降效费、机械降效费在什么情况下可以计取，怎么计算，费率是多少，有什么文件依据，谢谢 急
推荐回答（2个）
1、人工降效: 因高度增加,工人上下班所用时间增多、高空作业难度增加引起休息时间增多、垂直运输时间增多等因素造成人工作业效率降低。
2、机械降效:垂直运输时间增多与及人工降效引起的机械作业效率降低。
怎样计算降效费用？
人工降效按规定工程项目的全部人工费用乘以人工施工降效率；
吊装机械降效率费用按规定项目中的“构件运输及安装”分部工程中的全部机械费乘以降效率；
其他机械降效费用按规定项目中的全部机械费用（不包括吊装机械）乘以降效率求得。
建筑物超高人工、机械降效率（%）
檐高及降效率
120m(35-37层）以内
110m(32-34层）以内
100m(29-31层）以内
90m(26-28层）以内
80m(23-25层）以内
70m(20-22层）以内
60m(17-19层)以内
50m(14-16层）以内
40m(11-13层）以内
30m(7-10层）以内
人工降效
45.83
40.91
35.20
27.22
22.50
17.86
13.33
9.00
6.00
3.33
吊装机械降效
99.00
99.00
85.60
72.33
59.25
46.43
34.00
22.20
15.00
7.67
其他机械降效
45.83
40.91
35.20
27.22
22.50
17.86
13.33
9.00
6.00
3.33
降效的概念是产量降低，计算公式不应该是乘法加法，应该是减法除法。1/（1—降效率），我认为这是符合文字含义的。加法怎么能说降效，那该说是费用增加。
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