Explain the procedure of the storage, transportation and erection of prefabricated building elements.
Storage of pre-fabricated building elements:
1) Procurement storage of Unloading raw materials
2) Testing of raw materials
3) Design of concrete mix
4) Fabrication of reinforcement cages
5) Oiling and laying of moulds in portion
6) Placing of reinforcement cages inserts and fixtures
7) Preparation of fresh concrete
8) Transport fresh concrete
9) De-pouring into mould etc.
10) Curing of concrete
11) Stacking of pre-cost element
12) Testing of finished Component
Transport of pre-fabricated building elements:
1) Transport of prefabrication elements must be carried out and with extreme care to avoid any flock and distress in elements and handled as far as possible to be placed in final portion.
2) Transport of prefab elements inside the factory depends on the method of production selected for the manufacture.
3) Transport of prefab elements from the factory to the site of action should be planned in conformity with the trafficable rules and regulations as stipulated by the authorities the size of the elements is often restricted by the availability of suitable transport equipment, such as tractor-am-tailor, to suits the load and dimension of the member in addition to the load carrying capacity of the bridges on the way.
4) While transporting the prefab elements in various systems, such as wages, trucks, bullock cards etc. care should be taken to avoid excessive cantilever actions and desired supports are maintained. Special care should be taken in negotiating sharp beds uneven of slushy roads to avoid undesirable stresses in elements and in transport vehicles.
5) Before loading the elements in the transporting media, care should be taken to ensure the base packing for supporting the elements are located at specified portion only.
Erection of pre-fabricated building elements.
1) It is the process of assembling the Prefabrication element in the find portion as per the drawing. In the erection of prefab elements, the following items of work are to be carried out.
2) Slinging of the prefab elements.
3) Tying up of erection slopes connecting to the erection hooks.
4) Cleaning the elements and the site of erection.
5) Cleaning the steel inserts before incorporation in the joints lifting and setting the elements to correct position.
6) Adjustments to get the stipulated level line and plumb.
7) Welding of cleats.
8) Changing of the erection tackles.
9) Putting up and removing the necessary scaffolding or supports.
10) Welding the insorts laying the reinforced in joints.
11) The erection work in various construction jobs by using prefab elements differs with risk condition, hence skilled foremen, and workers to be employed on the job.