G6 - Concrete Stairs

Question 1

What is a closed stairwell?

Answer 1

Enclosed on both sides of the stairway. Handrail is attached on the wall on one or both sides.

Question 2

Describe a narrow U stairs:

Answer 2

Narrow U Stairs have two flights of stairs running in opposite directions with a landing at the mid-way point. Compact.

Question 3

Describe wide U Stairs

Answer 3

Have three flights separated by two landings. Stairway has an open center that allows light to penetrate to flights below.

Question 4

Describe long L stairs:

Answer 4

Long L stairs consist of long straight flight, with a short flight of 2 or 3 treads at the top or bottom at a right angle to the long stairs.

Landing or winder used at change of directions.

Question 5

Describe Wide L stairs:

Answer 5

Consist of two straight flights at right angles to each other, with a landing or winders at the change of directions.

Question 6

Describe double L stairs:

Answer 6

Consist of a straight flight, with 2 or 3 threads at right angles to the main stairs at both the top and bottom. A landing or winders are used at the change of direction.

Question 7

What is the purpose of a stair landing?

Answer 7

Give access from one floor level to another with intermediate landing.

Question 8

Finish surface of a concrete step should be:

Answer 8

Slip resistant and the surface should slope away from the building to allow drainage.

Question 9

Alternative to cast-in-place stairs:

Answer 9

Pre-cast stairs

Question 10

Pre-cast stairs placed over:

Answer 10

Excavated grade or attached to wood, metal or concrete stringers.

Question 11

Which forms are used for Pre-cast stairs?

Answer 11

Steel, as it is easy to clean and gives a smooth exterior finish to the stairs.

Question 12

Reinforcing in concrete stairs is placed where?

Answer 12

From the soffit side.

Question 13

Concrete is used in commercial construction because of the:

Answer 13

Durability and resistance to fire.

Question 14

Concrete stairs are supported on previously placed concrete and structural components and structural components are attached with:

Answer 14

Steel dowels.

Question 15

To simplify construction of pre-cast concrete stairs:

Answer 15

Rebar dowels are sometimes threaded into the threaded inserts cast into walls.

Question 15

To make nosing resistant to damage, a nosing insert is used:

Answer 15

Nosing consists of metal edge that is placed in the concrete as it is being finished.

Question 16

Purpose of nosing:

Answer 16

To provide a space for the toe or heel when walking up or down the stairs.

Question 17

Amount - measurement of nosing is:

Answer 17

25 to 30 mm

Question 18

Raked nosing:

Answer 18

Easiest nosing to form - slope the riser form to create a tread depth greater than the tread run

Question 18

Angled nosing on on underside is not allowed to be less than:

Answer 18

60 degrees to the horizontal.

Question 19

Nosing:

Answer 19

Projection of the tread or floor beyond the face of the riser base.

Question 20

Nosing line:

Answer 20

Imaginary line drawn along the top edge of the nosing.

Question 21

Tread depth:

Answer 21

Sum of the run PLUS nosing.

Question 22

Stair soffit slab:

Answer 22

Supports the steps

Question 23

Stair soffit:

Answer 23

Underside of the stair soffit slab.

Question 24

Flight of stairs:

Answer 24

Series of steps between landings.

Question 25

Headroom:

Answer 25

Vertical distance from the nosing line to the underside of the floor or beam above.

Question 26

Opening in the floor for the stairs is called:

Answer 26

Stairwell

Question 27

What is the difference between a long L stair and a Wide L stair?

Answer 27

Long L has a long flight and a short flight connected by landing or winders

A wide L has 2 similar length flights at right angles to each other

Question 29

What is the difference between an open stairwell and a closed stairwell?

Answer 29

Closed stairwells are enclosed on both sides

Open stairwells have one or both sides open to a room or hallway

Question 30

Why are landings used between flights of stairs?

Answer 30

Landings break long lengths of flights and allow stairs to change directions.

Question 31

What is a stair soffit slab?

Answer 31

Structural concrete slab that support the steps.

Question 32

Answer 32

Wide U

Question 33

Answer 33

L shaped with landing

Question 34

Answer 34

L shaped with landing