hifiandmtb
Sphincter beanie
Preliminary report is out:
What a cluster fuck.Construction
There are a number of points noted on Level 10 of the building where construction
differed from design and / or Standards:
(a) Grouting: design drawings indicate that full grout coverage was expected
between the panel and the hob beam. However, during construction only the
inner surfaces of approximately 110mm width appear to have been grouted,
leading to an eccentric bearing load on the hob beam on Level 10. It should also
be noted that approved shop drawings show the grout extending over only the
inner portion of the hob beam to panel connection;
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(b) Location of reinforcing steel in the vicinity of the connection between the hob
beam and columns C21 and C38 on Level 10, in particular, inadequate cover
concrete due to encroachment of discontinued (anchored) column bars into the
cover zone, and the placement of an electrical conduit within the cover zone in
this area;
(c) A dowel bar between the hob beam and the panel was observed to be
incomplete, possibly cut during construction;
(d) The original design drawings of the building indicate precast concrete panels
that were the same width as the hob beam upon which they rest (180 mm).
These were subsequently manufactured to be 200 mm in width. The panels
were erected so that they overhang the inside face of the hob beam by
approximately 20 mm; and
(e) Inadequate tensile capacity in the horizontal direction in the bottom region of
Panel A that rests on the hob beam spanning columns C21 and C38. There is
compelling evidence indicating that the wrong size reinforcing bars were placed
in this area during manufacture of this particular panel – 20 mm diameter bars
were used instead of 28 mm diameter bars (see Figure 8).