Requirement of good stairs and Types

 Requirement of good stairs and Types

Stair give access from floor to be able to floor. The space/room housing stairs is called staircase. Stairs consists of quite a few steps arranged in a single flight or maybe more number of flights.
The dependence on good stairs are

(a) Width: 0. 9 m in residential buildings and 1. 5 meters to 2. 5 m in public places buildings.
(b) Number of Steps in a very Flight: Maximum number of steps in a very flight should be limited to be able to 12 to 14, while minimal is 3.
(c) Rise: Rise provided need to be uniform. It is normally 150 mm to be able to 175 mm in residential buildings although it is kept between 120 mm to 150 mm in public places buildings. However in commercial buildings more rise is provided through the consideration of economic floor region.
(d) Tread: Horizontal projection of any step in a stair case is called tread. It is also often known as going. In residential buildings tread provided is 250 mm during public buildings it is 270 mm to be able to 300 mm. The following empirical formula is utilized to decide rise and tread:

2R + T > 550 mm but < 700 to 600 mm

whereR is usually rise in mm and Capital t is tread in mm.

(e) Scalp Room: Head room available in the stair case really should not be less than 2. 1 meters.
(f) Hand Rails: Hand rails need to be provided at a convenient height of any normal person which is through 850 mm to 900 mm.

Types of Stairs

The stairs may be designed with wood, concrete masonry or together with cast iron. Wooden stairs will not be safe, because of the danger of fire. However they are used in unimportant buildings to having access to small areas in the top floors. Cast iron or steel stairs inside the spiral forms were used commonly to scale back stair case area. In many residential buildings masonry stairs are used. Reinforced concrete stairs are incredibly commonly used in all kinds of buildings. Based on the shapes stairs could be classified as:
(a) Straight stairs
(b) Dog legged stairs
(c) Nicely or open-newel stairs
(d) Geometrical stairs
(e) Spiral stairs
(f) Turning stairs.