Gwangju HDC Hwajeong I-Park, the cause of the collapse.PIT
The original design book construction status
In the event of an actual construction accident, the situation at the sceneFocus on the center of the load. 39th floor rooftop. Normal slab. 39th floor rooftop.Deck slab 1
PIT
plan
– 38th floor of concrete. 38th floor of Dongbari.Gabyeok
37th floor
37th floor
2 dongbari
Early demolition
36
368
The construction and support of the floor on the 039th floor.Unlike the original design, the load is randomly changed
floor construction general slab → deck slab
support method temporary support support support → concrete wall
PIT floor slab action load is concentrated in the center of the area.② The lower part of the PIT floor was demolished early, so the PIT floor
In the standard specification of the
National Construction Standards Center due to the continuous collapse of the floor slab in the lower part of the building due to the
first collapse, the rules for installing copper on the three floors below
concrete construction work.3 Concrete test specimens collected from collapsed buildings
As a result of the intensity test, most of the test subjects did not meet the acceptable range of
85 or higher in design standard strength
15 out of 17 floors
Data from the Ministry of Land, Infrastructure and Transport, Hyundai Industrial Development Apartment Collapse Construction Accident Investigation Committee
O IYONHAP GEWS
Kim Young Eun is reporter Park Young Seok 20220314.
If you summarize it into 3 lines,The construction method of the 1st to 39th floors was arbitrarily changed differently from the blueprint.2 – I should have kept the bottom part of the basket, but it was demolished early.3-The concrete was burned and the strength was low. Especially the 37th to 38th floors were less than 50th of the standard strength
–
In other words, the design drawing was completely changed without permission. The material was burned down and fell short of the standard
It was confirmed that the three-stage combo caused the collapse.
Considering that buildings don’t collapse with simple mistakes these days, it was a expected ending.Considering that the concrete has been burned down, I think it’s safe to remove all the other buildings as expected.
Sources