A Case of Utilizing Results

Technical datum original plan concerned ceiling falland escalator fall
Building Department, Standards and Accreditation System Division
FUKAI Atsuo, HeadIWATA Yoshihiro, Senior Researcher
Environment and Equipment Standards Division
KUBOTA Yuji, Senior Researcher
Research Center for Land and Construction Management Evaluation System Division
WAKIYAMA Yoshio (Doctor, Engineering), Senior Researcher(Key word) Building datum for ceiling and escalator
1. Damages in The Great East Japan Earthquake
In The Great East Japan Earthquake, the ceiling fell out inmany buildings, such as a gymnasium and a music hall,and damage arose on a scale of there being nothing once.
Moreover, two or more damage in which the escalatorsthat are installed in the shopping center fell occurred.
About these measures, it is not clearly shown as atechnical standard based on the Building Standard Law
now.
Based on the Technical Original Plan concerning theanti-ceiling falling off measure and Technical Datum
Original Plan concerning anti-escalator fall measure,
National Institute for Land and InfrastructureManagement prepared the Technical Datum OriginalPlan. That was published as a public comment 1) and2) from July 31, 2012.

In order to establish enough "bearing width" wepresented datum that require the "Bearing width" must
more than 1/40 of hoisting height (lift)
3. Future plan
Proceeding an opinion recruiting until September 15,
the Building Structure Datum Committee (Chairperson Tetsuo Kubo, Honorary professor in Tokyo University)
which established in National Institute for Land andInfrastructure Management is going to deliberate becauseof the submitted opinion.
In future, we will establish a Technical Datum basedon Building Standard Act on the basis of the technicaldatum original plan that contains information gatheredafter going over the required legal process.
Current state
Hook type that has
Junction hardware suchrisk of slip or comeas a clip, a hanger
off at earthquake.

Junction by screws, etc.

Placement of hang bolts,
bracesTighitly arrange
Hang bolt / m~2
Reinforced brace
1 pair / 15 ㎡

Earthquake force fordesign(Horizontaldirection)

Photo: An example of the ceiling falling off damage
in a gymnasium
2. Technical Datum Original Plan
(1) Technical Datum Original Plan concerning ananti-ceiling falling off measure
Making a suspended ceiling for the target, we set aceiling of larger than 200m~2 located at higher than6m.We presented the datum that consists of thespecifications’ datum that setting concrete specifications,
datum according to a calculation by spectrum method,and case that performed high structure calculation alongwith a structural skeleton. .
(2)Anti-escalator fall measure

Example by Technical Datum
Original Plan

Various by design

1G approx. inreality

Maximum 2.2G

Figure: Comparison of Technical Datum Original Plan
and current state concerning
anti-ceiling falling off measure
Reference1) Opinion recruiting about "Tentative plan of anti-ceiling
falling off measure in a building"
2)

Opinion recruiting about ""Tentative plan ofanti--prevention of falls measure of an escalator"
http://www.nilim.go.jp/lab/bcg/kisya/journal/kisya2012073
1_1.pdf