TLC TAS-12A, Assembly Manual, Page: 36 / 38

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5.
Assembly of stairs and gangways
The assembly should be conducted after earlier preparation of the ground, which means levelling and
providing a stable support for the stairs during the entire exploitation process. Considering the temporary
character of the construction, it is allowed to mount it on reinforced concrete slabs, concrete blocks or
wooden blocks. When concrete or wooden blocks are used, it is required to place them on hard, gravelled,
properly drained surface. It is required to provide proper draining system when assembling on ground.
Additionally, the stairs must be anchored using the openings in lower foot if they are assembled on ground
(minimum anchor length =40cm).
There is a possibility to connect flights of stairs to provide communication route to storeys of a
building.
In such case, it is allowed to connect max. two flights of stairs with a total number of steps not
exceeding 24 steps, e.g. 12+12=24, 18+6=24. It is required to support the flight in the middle of its length with
two PR-1 supports.
The distance from the excavation edge and stairs angle are shown on fig. 3.
Stairs with 3, 6, 9, 12 steps can be used as a gangway over the excavation, with a minimum distance of
D = min. 500mm from the both excavation edges on which the gangway has to be supported. Stairs with 15 or
18 steps that can be used as gangways after assembling the truss (TAS-WB1 and TAS-WB2 components).
There is a possibility to connect 15- and 18 steps stairs equipped with trusses in 15+15, 15+18, 18+18 steps
configurations (a number of components shown in tab 5.). In this case, a minimum distance of the gangway
foot from the excavation edges must be D = min. 700mm. Additionally, the gangway must be anchored to the
ground.
Fig. 2- Gangway over excavation