请大家帮帮忙。。。

godlikes

A 50 m long by 5 m wide by 200 mm thick slab at first-storey level is to be cast. G35
normal mix concrete is ordered from the ready mix supplier. Using the following data:
· The capacity per concrete truck is 5 m3.
· The ready mix supplier takes 10 minutes to batch and mix the concrete after receiving
the order from the contractor.
· The concrete truck takes 30 minutes to travel from batching plant to the construction
site.
· The interval between each truck arriving at site is 8 minutes.
· The method of placing the concrete at the site is using direct discharge.
· The rate of placing of concrete per truck is 5 minutes.
· Smooth traffic on the road.
Estimate the time to complete the concreting at site, starting from order of concrete to
the last truck of concrete.

MU

最重要先算出 total concrete volume 先。。

从你的 data 是 需要 order 50m3 的 Grade 35 concrete

一车可以载 5m3 的话，那总共需要 10车 （10车 X 5m3 =50m3)

第一车会在接到 site 的人电话叫出后 ，花 10分钟来 batch concrete然后出第一车。 意思是说当 site 的人电话一过去叫出 concrete, （10 分钟 + 30分钟 travel )=40 分钟左右会到 site 第一车 （5m3).....

讲到这里，好像很懒惰算这样。。。。。

不过这种 calculation 是一个 assumption 罢了，其实在 site 不配合用的，只是作为参考

MU

应该是这样吧。。。。

9.00am call out
9.40am 1st arrived (5m3)
9.45am 1st out
9.48am 2nd arrived (10m3)
9.53am 2nd out
9.56am 3rd arrived (15m3)
10.01am 3rd out
10.04am 4th arrived (20m3)
10.09am 4th out
10.12am 5th arrived (25m3)
10.17am 5th out
10.20am 6th arrived (30m3)
10.25am 6th out
10.28am 7th arrived (35m3)
10.33am 7th out
10.36am 8th arrived (40m3)
10.41am 8th out
10.44am 9th arrived (45m3)
10.49am 9th out
10.52am 10th arrived (50m3)