1. 건설분야-교육자료
미디어개발
Construction
Collapse during form installation after excavation on the lower part of masonry
Power Point Training Material on Serious Accidents in Construction
(Serious Accidents in Construction)
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2. Table of Contents I. Fatality Overview II. Site Overview
III. Fatality Description
IV. Fatality Cause
V. Precautions

3. Think it over!
Find out the Hazard Points in the figure below.

4. Collapse during form installation after excavation
on the lower part of masonry
1. Fatality Overview
Date & Time: 11:45, June 19, 2007 (Tuesday)
Place: new constructions of ○○ multiplex house site
Victim: mold carpenter of a contractor (male/53)
While the victim was installing a form on the lower part of excavated masonry retaining wall, old masonry and block wall collapsed and a falling stone hit the victim in the side.
He was taken to the hospital. However, he died during medical treatment.
Power Point Training Material on Serious Accidents in Construction
Site Overview
New construction multiplex house building (with 3 stories above ground and 1 below, 8 houses) site
- Public works were under way. (overall process rate was 3%)

5. Collapse during form installation after excavation
on the lower part of masonry
3. Fatality Description
At about 07:30, 7 workers (employer, carpenter 2, 2 iron bar workers, B/Operator) including the victim went to the site.
From 08:00 to 11:40, they excavated ground on the bottom the existing masonry retaining wall (width: 0.8m, depth: 1.0m) using a small backhoe (Komatsu pc 18, so called, mini excavator). After that, they inserted iron bar (H: ≒ 2m) into the ground to install forms (euro-from).
At about 11:45, the victim was installing joist (pipe for steel pipe scaffold) and sleeper (2’×2’ rectangular lumber) on the forms. At that time, block for the masonry and wall collapsed and a falling stone hit him in the side. He was took to the hospital. However, he died during medical treatment.
Power Point Training Material on Serious Accidents in Construction 5

6. Collapse during form installation after excavation
on the lower part of masonry
Power Point Training Material on Serious Accidents in Construction
[Fatality Overview] 6

7. Collapse during form installation after excavation
on the lower part of masonry
Power Point Training Material on Serious Accidents in Construction
[Fatality Site (Refilled after fatal accident to prevent the second accident)] 7

8. [Masonry and wall collapse (upper house, refilled up)]
Collapse during form installation after excavation
on the lower part of masonry
Power Point Training Material on Serious Accidents in Construction
[Masonry and wall collapse (upper house, refilled up)] 8

9. Collapse during form installation after excavation
on the lower part of masonry
4. Fatality Cause
Insufficient protections against collapse such as preparatory study
- For excavation close to old masonry and block wall, you must conduct a preparatory study to prepare protections against collapse. However, they did not prepare protections against collapse.
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10. Collapse during form installation after excavation
on the lower part of masonry
5. Precautions
Protections against collapse such as preparatory study
- For excavation close to old masonry and block wall, you must conduct a preparatory study install retaining wall and must prepare protections against collapse of Shotcrete pouring such as reinforcement measures.
Power Point Training Material on Serious Accidents in Construction 10

11. Thank You.
Power Point Training Material on Serious Accidents in Construction