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NFPA-130 Metro Design-TBM walkway

Question asked by dbozan on Mar 26, 2019

Hi all,

 

In Nfpa below sections it stated guard and hand rail. What it means with 'guard'? Also do you have any tbm section with these equipments even as image for example? Thank you

 

6.3.3.5* Walkways that are more than 760 mm (30 in.) above
the floor or grade below shall be provided with a continuous
guard to prevent falls over the open side.

 

A.6.3.3.5 It is important that guards be configured so that they
do not interfere with either the vehicle dynamic envelope or
with egress from the train onto the walkway. For that reason,
guards are not required on the trainway side of raised walkways,
provided that the bottom of the trainway is closed by deck or
grating so that persons could not fall through the bottom of
the guideway.

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6.3.3.8* Walkways that are more than 760 mm (30 in.) above
the floor or grade below shall be provided with a continuous
handrail along the side opposite the trainway.

 

A.6.3.3.8 It is important that handrails be configured so that
they do not interfere with either the vehicle dynamic envelope
or with egress from the train onto the walkway. For that reason,
handrails are not required on the trainway side of raised walkways.
Likewise, raised walkways located between trainways are
not required to have handrails, provided they are a minimum
width of 1120 mm (44 in.).

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