某机电安装工程项目混凝土总需要量为5000m3,混凝土工程施工有两种方案可供选择:方

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问题:

某机电安装工程项目混凝土总需要量为5000m3,混凝土工程施工有两种方案可供选择:方案甲为现场制作;方案乙为购买商品混凝土。已知商品混凝土平均单价为410元/m3,现场制作混凝土的单价计算公式为:

式中 C——现场制作混凝土的单价(元/m3);

C1——现场搅拌站一次性投资(元),本案例C1为200000元;

C2——搅拌站设备装置的租金和维修费(与工期有关的费用),本案例C2为15000元/月;

C3——在现场搅拌混凝土所需费用(与混凝土数量有关的费用),本案例C3为320元/m3

Q——现场制作混凝土的数量;

T——工期(月)。

[问题]

假设该工程的一根9.9m长的现浇钢筋混凝土梁可采用三种设计方案,其断面尺寸均满足强度要求。该三种方案分别采用A、B、C三种不同的现场制作混凝土,有关数据见表3。经测算,现场制作混凝土所需费用如下:A种混凝土为220元/m3,B种混凝土为230元/m3,C种混凝土为225元/m3。另外,梁侧模21.4元/m3,梁底模24.8元/m3;钢筋制作、绑扎为3390元/t。

试选择一种最经济的方案。

表3 各方案基础数据表

方案断面尺寸/mm钢筋(kg/m3混凝土)混凝土种类
 300×90095A
 500×60085B
 300×800105C

考点:注册咨询工程师现代咨询方法与实务现代咨询方法与实务
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Hello,everyone. Because of the high rate of school violence(力)in some areas, teenagers’ safety becomes a serious problem. We are planning to set up an organization named School Watch to make sure that students have a safe school environment. Please be part of our plan!
What is School Watch
School Watch is a volunteer project in our school. It helps us stop violence and improve the quality of school life. It will keep yourself and your schoolmates safe. The other members of School Watch care for you and your classroom and you do the same for them.
Is it for everyone
Anybody can become a member of School Watch because everyone has something to offer.
What else can it do
School Watch makes it possible for us not only to help each other But also to make friends with each other. Some members may offer to help schoolmates who have problems with their homework.
Who is the Best School Watcher
Our school will look for the Best School Watcher and give him or her lots of prizes. You could be the one !
How do you start
To be part of this plan, the only thing you need to do is to talk to the director of the plan in your grade. If you want to get more information, check the official website at www.schoolwatch.com.

The Best School Watcher will get a lot of prizes from ______ every year.

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D.the society

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