Stairs

 
Types of stair elements:

T – straight stairs with a central beam
U – straight return stairs
KT – spiral stairs with a central beam
KU – spiral return stairs

Tread
Finishing possibilities:
- mosaic concrete tiles (installed at the construction site)
- exposed aggregate concrete
- sandblasted surface
- mould surface

Underside
Finishing possibilities:
- steel floated surface
- rolled surface
- brushed surface

Loads
Live load 4kN/m2, point load 2 kN. These are normative loads.

Stair elements can also be manufactured according to the drawings supplied by the client.

Straight return stairs

Surface of the steps: smooth mould surface, exposed aggregate surface or sandblasted surface.

Flights are raised from loops located at the edges of the elements or from internal female thread sleeves in the treads. The railings are attached to the female thread sleeves M12 located on the side of the flight or with through bolts at the construction site.

Standard dimensions of stair elements
Height of the storey 2,800 mm:
8 tõusu (8×175 mm), kaal ~ 1550 kg
9 tõusu (9×155,6 mm), kaal ~ 1950 kg
step width (e) 270 or 300 mm
stair width (B) 1,200 mm

Step width (e), step height (h), the number of steps and the stair width (B) can be modified when necessary.

Type marking
For example TR8/U, where
8 = number of steps
U= straight return stairs.

Dimensions, mm. e= step width, h= step height, b= stair width

e h b Steps (max)
270 150…180 ≤ 1600 20
300 150…185 ≤ 1600 20

Spiral stairs with a central beam

The width of stairs with two or three flights is 1,200 or 1,600 mm. The dimensions indicated in the table are for steps 270 mm wide. The stairs spirals 180° until reaching the storey height H indicated in the table. Front and side coverings of the tread plates: mosaic concrete, exposed aggregate surface or smooth mould surface. The central beam is raised from loops located at the edges of the elements or from female thread sleeves located in the treads. The railings are attached to the female thread sleeves M10 located on the side of the treads.

Weight of stair elements
TR18/KT/1200: central beam ~ 1,300 kg +
tread plates, 900 kg = ~2,200 kg

Type marking
For example TR18/KTe, where
18 = number of steps,
KT = spiral stairs with a central beam,
e = 700 mm wide central beam.

Dimensions, mm

Marking h a b c d f g B C H
TR18/KT 150..180 580 280 600 320 70 1200 3700 1850 2700..3240
TR18/KT 150..180 580 280 600 720 70 1600 4500 2250 2700..3240
TR18/KTe 150..180 655 440 700 60 70 1200 3850 1925 2700..3240
TR18/KTe 150..180 655 440 700 460 70 1600 4650 2325 2700..3240
TR19/KTe 150..180 655 440 700 60 70 1200 3850 1925 2850..3240
TR19/KTe 150..180 655 440 700 460 70 1600 4650 2325 2850..3240

 

Lower positioning notch in the landing:

Upper positioning notch in the landing:

Straight stairs with a central beam

Construction: load-bearing central beam and cantilever tread plates. Front and side coverings of the tread plates: mosaic concrete, exposed aggregate surface or smooth mould surface. The central beam is raised from loops located at the edges of the elements or from female thread sleeves located in the treads. The railings are attached to the female thread sleeves M10 located on the side of the treads.

Standard dimensions of stair elements
Height of the storey 2,800 mm:
8 tõusu (8×175 mm), kaal ~ 1000 kg
9 tõusu (9×155,6 mm), kaal ~ 1100 kg
step width (e) 270 or 300 mm
stair width (B) 1,200 mm

Step width (e), step height (h), the number of steps and the stair width (B) can be modified when necessary.

Type marking
For example TR8/T, where 8 = number of steps, T = straight stairs with a central beam.

Stair
width,mm
thickness of tread
plate, mm
1200 60
1600 70

 

Lower connection:

Lower positioning notch in the landing:

Upper positioning notch in the landing:

Spiral return stairs

Two or three flights; stair width 1,200 or 1,600 mm. The dimensions indicated in the table are for steps 270 mm wide.
The stairs spirals 180° until reaching the storey height H indicated in the table.
Surface of the steps: smooth mould surface, exposed aggregate surface or sandblasted surface.
Flights are raised from loops located at the edges of the elements or from female thread sleeves located in the treads.
The railings are attached to the female thread sleeves M12 located on the side of the flight or with through bolts at the construction site.

Type marking
For example TR16/KU, where
16 = number of steps,
KU = spiral return stairs.

Dimensions, mm

Marking h a f g B C H
TR18/KU 150..180 580 70 1200..1600 3700..4500 1850..2250 2700..3240
TR19/KU 150..180 655 70 1200..1600 3850..4650 1925..2325 2850..3420

Lower connection:

 

Upper connection: