| Case Name |
The result in the execution of the road improvement business which construction expenses was high because of error in the integration of excavation and transportation charges of the gravel. |
| Pictograph |
|
| Date |
1997 |
| Place |
Kumamoto Prefecture. |
| Location |
The prefectural office. |
| Overview |
In the integration of construction expenses of earth work, since the work was not carried out in accordance with integration standard enacted by the prefecture, excavation and transportation charge was excessively calculated, and this case construction expenses was high even considering underestimated embankments transportation charges in the temporary road construction, and government subsidy equivalent \ 4037,550 was considered unreasonable. |
| Incident |
In calculation of excavation and transportation cost of the 3348m3 of gravel whose the transportation distance was about 100m within construction expenses of earth work, based on integration standard of the prefecture enactment, on the assumption that the soil is loaded on dump truck after excavated by backhoe and transported, they calculated by mutiplying construction unit price for 1m3 and the soil amount.
In adding up excavation and transportation cost by the computer, the unit price for 1m3 should have be calculated by dividing the sum of transportation cost for 10m3 and excavation and loading the cost for 10m3 by 10, but in the prefecture, cost for 100m3 was input in transportation charges in error, and construction unit price for 1m3 was excessively calculated. |
| Sequence |
Kumamoto Prefecture implemented earth work, drainage, etc. in fiscal 1997 and 98 at \ 116550000 construction expenses ( government subsidies \ 64102500 ) to set up the road as part of the national road No.387 improvement business in the Aso country Oguni towm Nishizato district.
It was decided to construct the subgrade by transporting drilled gravel to the embankment position, while drilling country rock to the subgrade plane in the cut land position.
of the gravel was wrongly estimated at \ 11004,876.
The excavation and transportation cost was \ 1814,616 when calculating the correct unit price for 1m3 by applying transportation charges of 10 m3.
even considering \ 3459,941 of underestimated embankments transportation cost in the temporary road construction, the adjusted total construction cont was \ 109208,400, and actual construction cost was about \ 7341,000 higher than this, and government subsidy equivalent \ 4037,550 which concerns this was considered unreasonable. |
| Cause |
Since the integration of construction expenses by the computer is easy, and since it can be done in short time, even a few people without the expertise can do it. And, it is also difficult to notice errors, since the calculation process is disregarded. |
| Countermeasures |
Enough personnel.
Elaborate examination. |
| Knowledge Comment |
Computers doesn't err, but they doesn't notice the human errors. |
| Scenario |
| Primary Scenario
|
Carelessness, Insufficient Precaution, Regular Operation, Erroneous Operation, Possible Damage, Potential Hazard
|
|
| Sources |
The 1998 fiscal year settlement inspection report ( Board of Audit ).
|
| Financial Cost |
Government subsidy delivery amount considered unreasonable \ 4037,550. |
| Field |
Civil Engineering
|
| Author |
NAKAGAWA, Masafumi (The University of Tokyo)
KUNISHIMA, Masahiko (The University of Tokyo)
|
|
