chp 9 Flashcards
(11 cards)
1
Q
describe precast concrete construction
A
- cast in manufacturing yard and fixed in position in site
- normally cast in steel moulds
- more stringent dimensional precision is required
2
Q
describe cast-in-situ
A
- casting and fixing at the exact same position on the construction site
- usually cast in timber moulds
- less critical in dimensional precision
3
Q
criteria that need particular consideration
A
- handling stress
- anchorage at support
- joints in movement
- overall stability
4
Q
type of connections
A
- tension joint
- compression joint
- shear joint
5
Q
type of joints in movement
A
- contraction joint
- expansion joint
- sliding joint
- settlement joint
6
Q
advantages of precast
A
- faster construction speed
- better quality control
- dimensional deviation is small
7
Q
limitations of precast
A
- tolerances must be allowed for
- distance between precast yard and site will affect costing of project
- accessibility, storage area and the capacity if crane will affect erection process on site
8
Q
stages of fabrication process
A
- manufacturing stage
- erection stage
9
Q
procedure of manufacturing stage
A
- mould fabrication
- casting and curing of concrete
- storage of precast components
- delivery of components
10
Q
equipment used in manufacturing precast components
A
- cranes
- racks
- tucks and trailers
11
Q
process in erection stages
A
- temporary storage on site
- putting up the components
- temporary support
- fixing of joints
