Precast concrete stairs

• Precast concrete stairs can be produced to most of the formats used for in-situ RC stairs . 
• Precast concrete stairs can be designed and constructed as :

1. Precast concrete straight flight stairs
2. Precast concrete cranked slab stairs 
3. Precast concrete spiral stairs 
4. Precast concrete steps built into or cantilevered from a structural wall . 

• Design considerations for precast concrete stairs are the same as those for cast in-situ concrete stairs . 
• However , the fixing and support require a different approach . 
• Bearings for the ends of flights must be provided at the floor or landing levels in the form of a haunch , rebate or bracket . 
• Continuity of reinforcement can be achieved by leaving projecting bars and slots in the floor into which they can be grouted . 

(Precast bonding or continuity bars )
(Projecting bonding or continuity bars )
(Rebate for precast concrete flight )
(Chases in floor made good with matching grout )
(RC floor slab )
( Flight in position )
(RC edge beam )