| Case Name |
Result in which there is the possibility which brings about the defect in the embankment since the design of the abutment was appropriate in the execution of urgent local road development project. |
| Pictograph |
|
| Date |
1991 |
| Place |
The Yamanashi Prefect. Kofu City. |
| Location |
The city office. |
| Overview |
The location of the abutment bottom face had been decided by the method for case that the structure of the river is the excavated river channel, when the pedestrian bridge ( 94.7m length, 3.2m width ) is established as an addition to Iitoyo bridge constructed over the first-class river Arakawa. However, the abutment bottom face was not in appropriate position for the actual structure of river without being the excavated river channel. Government subsidy equivalent \ 4064,000 which concerns this was recognized unreasonable as the result, for the standard in the river management had not been satisfied, and it became the improper structure with the possibility which brings about the defect in the embankment. |
| Incident |
In the Kofu City, in the design of the abutment, by misunderstanding that the structure of the river is the excavated river channel, the design was carried out because the embankment of the bridge access road is in the back of the embankment. As the result, the bottom face was located in 2.4m upper part than the ground of the embankment in spite of the abutment bottom face originally should have been fixed to the ground of the embankment. Therefore, it became the improper structure with the possibility which brings about large defect in the embankment without not satisfying minimum required standard in the river management. |
| Sequence |
The assistant industry for the construction of pedestrian bridge of 2 abutments and 2 bridge piers was carried out at \ 58203,240 ( government subsidies \ 29101,620 ) construction expenses.
In the Kofu City, in the design, the structure of the river was considered the excavated river channel by mistake, because the embankment of the bridge access road is in the back of the embankment.
By the method as the structure of the river is the excavated river channel, the location in the abutment bottom face was decided.
However, the minimum required standard in the river management was not satisfied, since it was not the excavated river channel actually, and the abutment bottom face was in the improper position.
Government subsidy equivalent \ 4064,000 which concerned this was considered unreasonable. |
| Cause |
Shortage of the investigation shortage for the construction record of the existing bridge is mentioned. |
| Countermeasures |
The investigation for the construction record of the existing bridge should be done completely. |
| Knowledge Comment |
Previous construction records should be investigated in detail, when condtructing the new bridge to the existing bridge as an addition. |
| Scenario |
| Primary Scenario
|
Insufficient Analysis or Research, Insufficient Prior Research, Ignorance, Insufficient Knowledge, Planning and Design, Poor Planning, Malfunction, Specifications Not Met, Possible Damage, Potential Hazard
|
|
| Sources |
The 1992 fiscal year settlement inspection report ( Board of Audit ).
|
| Financial Cost |
Government subsidy delivery amount considered unreasonable : \ 4064,000. |
| Multimedia Files |
Fig2.Bridge stand installation position for river
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Fig3.Bridge stand installation position for Hoco
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| Notes |
In the design of the abutment installed in the embankment, it has determined that the bottom face shall be fixed to the ground of the embankment according to the standard of structure policy ( government ordinances No.199th, 1976 ) such as the river management facilities shall ought to be minimally satisfied. |
| Field |
Civil Engineering
|
| Author |
MIYAKI, Yuya (The University of Tokyo)
KUNISHIMA, Masahiko (The University of Tokyo)
|
