Assembly sequence of a prefabricated building

The sequence is divided into four stages or phases:

Phase 1

Ground is excavated.

Concrete foundations are constructed.

Column base plates are fixed.

Steel columns are erected

Event1, Initially the ground is excavated.

Event 2 Then, the concrete foundations are constructed.

Event 3 Subsequently the column base plates are fixed.

Event 4 Finally, the steel columns are erected.

Now look at the drawings of the next three stages and make state­ments about the sequence of events in phases 2, 3 and 4.

Phase 2

Roof decking is put in place.

Upper floor steel columns are erected.

Concrete floor slabs are put in place.

Beams and bracing are fixed.

Phase 3

Weatherproof roof membrane is laid.

Balustrade fixing plates are fixed.

Comer units are erected.

Horizontal cladding panels are fixed.

Vertical cladding panels are fixed.

Phase 4

Suspended ceilings are fixed.

Partitions are erected.

Services are installed in the ceiling void.

Floor finishes are laid.

Building is decorated.

20. Read these questions:

Why are the upper floor steel columns erected before the roof decking has been put in place?

Why is the roof decking put in place after the upper floor steel columns have been erected?

Now read the answer:

Because the roof decking requires the upper floor steel columns to support it.

Lookat the drawings for phases 1, 2, 3 and 4 and make similar questions to which these are the answers:

a) Because the concrete foundations require solid ground to support them.

b) Because the column base plates need a flat rigid surface to support them.

c) Because the steel columns transmit their loads through them to the foundations.

d) Because the concrete floors are supported by the beams.

e) Because the weatherproof membrane is laid over the balustrade fixing plates.

f) Because the horizontal cladding panels are fixed to the corner units.

g) Because the vertical cladding panels are fixed to the horizontal cladding panels.

h) Because the workmen require access to the ceiling void to install

the services.

i) Because the partitions are fixed to the suspended ceilings.

21. Identify the part of the building or the phase of the assembly sequence described in these sentences:

a) This cannot be put in place until the upper floor steel columns have been erected.

b) Before fixing these, the workmen erect the corner units.

c) During this phase the beams and bracing are fixed.

d) The workmen fix these after constructing the concrete foundations.

e) The electric wiring is installed during this phase.

f) When the balustrade fixing plates have been fixed, the workmen can start laying this.

22. Read this description of phase 1 of the assembly sequence:

Having completed the preparation of the site, the workmen begin the initial stage. This includes excavating the ground, constructing the concrete foundations, fixing the column base plates and erecting the steel columns. The workmen begin by excavating the ground. This precedes the constructing of the concrete foundations because they require solid ground to support them. This is followed by the fixing of the column base plates. Finally the steel columns are erected.

Now use it as a model to write similar descriptions of phases 2, 3 and 4.

Using fig. 2-4 explain what kinds of concrete used in the certain part of a building what kinds of beams and slabs. What will you use for strengthening framework (types, slabs of beams and slabs) and why. Fulfill this task in the form of a dialog for 3-4 persons.