8. 3.2.4. Worker Feedback
3.2.4.1. Storm Pipes
The workers were frustrated by the location of the storm
pipes. According to them instead of being installed on the opposite
wall the pipes could have been placed on the side wall so that it
would have been easy for them to work. Moreover since there was
no solid platform to work upon plus steel frames in the way, the
workers were thus worried about the time it will take to complete
the matelines.
3.2.4.2. Steamfitters
The workers seemed disappointed at the fact that they
were not provided with long pipes to do the matelines. According
to them the use of short pipes involves the use of more couplings
[Item 12: Detail of Unnecessary Couplings], which might lead to
leaks in addition to being time wasting and expensive. They
suggested that they could easily and swiftly work with longer pipes
as they do not have to look for pipes for the required length,
instead they could cut as per requirement saving time and money.
Moreover one of the PTAC cables in the 10th floor Unit A5 Mod
1002 was missing which could result in delay in the testing of the
floor.
3.3. Carpentry
3.3.1. Progress
In the past week, carpenters have finished wall and ceiling
matelines on floors 12, 11, and 10. Those three floors already have
fastened floor matelines. Carpenters are currently working on the 9th floor
matelines, and will continue down from there. The completed floors have
some missing wall/ ceiling matelines (of which the sides of the matelines
are observed to be very close to one another <1.5”). The workers have
informed us that those are inticipated to have expansion joints. Those,
and covering plumbing/ electrical mateline will be completed at a later
date.
3.3.2. Time Study
Time studies are hard for the carpentry trade because of the
variable nature of the matelines. Some take as little as 5 minutes, some
take as long as an entire day. So far there are more than 6 distinct types
of carpentry matelines. A few of these are already documented and can
be found in this week’s draft of the Mateline Procedure document.
9. 3.3.3. Recurring Incidents
3.3.3.1. Provided Wall Frames Not Being Utilized
It was observed that the wall framing that is factory
provided [Item 6: Provided Wall Framing] is not being utilized by
carpenters. When asked, the carpenters responded that their
foreman instructed them to disregard them and instead build their
own framing. In addition, the carpenters explained that the
provided framing would not be square and when installed would
not yield the correct dimensions for a door frame. It was observed
that none of the frames were attempted to be used. Walls
constructed from scratch were observed. These were the most
time consuming carpentry matelines.
3.3.3.2. Uneven Holes Around Steel Plates
It was observed that in many of the places surrounding the
steel plates connecting mods, the carpentry installed to cover it
was not flush. This was due to crude holes being cut by steel
workers for access to the steel beams..
Examples of holes cut by steelers on the 9th floor: Item 1:
Steel Plate ex. 1, Item 2: Steel Plate ex. 2, Item 3: Steel Plate ex.
3.
As a result of crude holes, the installed sheetrock and
versaroc is not square; examples shown in Item 4: NonSquare
Wall Mateline and Item 5: NonSquare Floor Mateline.
3.4. Sprinkler
3.4.1. Progress
The installation of sprinkler matelines on the 9th floor was
completed on Friday, 18th and the system was tested a second time after
a minor leak in the stand pipe. No leaks were found in the second test
and the floor was okayed.
A new set of two workers started with the 10th floor mateline
connections. However the connections were still not complete on floor 6
due to the presence of mechanical pipes in the way of sprinklers. The
problem was noted and action is soon about to take place in the coming
week. Once the 6th floor is complete the workers will test the sprinkler
system from floor 2 to 10 with water at 50 psi for an hour to check for
leaks. The test is scheduled to take place next week.
The riser connections for the drain pipe were started on Tuesday.
The risers have been installed to the 13th floor from floor 9 and
11. nipple was used. Instead of a 3” a closed nipple should have been
used.Item 7: Sprinkler Elbow Pipe
3.4.3.5. Support Failure of Sprinkler Riser
The standpipes were pressure tested on Wednesday to
check for leaks. The test was supposed to take place at 300 psi
but the worker wanted to increase the pressure in steps to avoid
bursting of pipes. The first test was done at 150 psi and there
were no leaks to be found. But as the pressure was increased the
pipe going through staircase 2 sunk by 4” due to the weight of the
pipe plus water. Item 8: Sprinkler Riser Failure and Item 9:
Sprinkler Riser Failure Detail.
Further damage was prevented due to the use of riser
clamps on certain floors installed by the workers. A meeting took
place with Bill, the project manager from Turner Construction Co.
There was talk of starting at the 15th floor, disconnecting the riser,
moving it up to the correct height, and repeating that process joint
by joint all the way to the basement.There was some investigation
as to whether or not damage was done to Barclay Center
systems.
3.4.4. Worker Feedback
The workers expressed concerns over welding of the sprinkler
pipes. According to him welding may cause leaks as sometimes welding
is imperfect.
Another major concern was the going down of the standpipe
through the staircase 2. According to one of the workers the use of
compressed wood to support the pipe was not sufficient as the pipe was
too heavy for the wood floor. His suggestion was to form a square cement
unit around the pipe to support the added weight. The worker seemed
frustrated and worried that this would hurt somebody in the future.
4. Installation
4.1. Modules
4.1.1. Progress
The modules continue to go up, they will be delaying for a few
days to jump the crane next week.
12. 4.2. Closet
4.2.1. Progress: None
4.3. Washer/ Dryer
4.3.1. Progress: None
5. Qualitative and Empirical Data
5.1. Observed
The trend holds that after at least a week of working on mateline work,
productivity sees a large boost. Idling and conversations are more common when
different trades are working on the same floor as workers will stop for a quick
chat. Workers are able to chat while being productive within their trades.
6. Other Issues or Events: none
7. Conclusions and Recommendations
The suggestions of workers for recurring incidents seem to hold value. The
sprinkler riser failure this week was a direct result of the riser not having adequate
bracing. The workers we had been observing made this suggestion at the very
beginning.
When speaking with the carpenters about why they did not choose to use the
provided built framing, the question was asked what would help them make the frames
useful. The workers suggested a plan labeled for them with the frame numbers on a floor
plan. If such a plan exists, or if there is a system in place for that, the workers know
nothing about it and instead are building their own frames. In addition there seems to be
no forward looking as far as materials go. They will wait to run out of sheetrock/ versaroc
before ordering more as opposed to making an educated guess at the beginning
whether or not they will need more.
13. 8. References: none
9. Appendix
9.1. Item 1: Steel Plate ex. 1
Shown above is a steel plate connecting two mods on the wall in the 9th floor
corridor. The hole cut to access the beams was crudely done. [Back to Uneven Holes
Around Steel Plates]
9.2. Item 2: Steel Plate ex. 2
Shown above is a steel plate connecting two mods on the floor between mods 0932 and
0930. The floor was crudely cut, and not supported after. As a result, the left half of the
hole has broken when someone stepped on it. [Back to Uneven Holes Around Steel
Plates]