OSUMC Weekly CCCT Progress Report (1/10/11 1/15/11)€¦ · Page 1 of 21 OSUMC Weekly CCCT Progress...
Transcript of OSUMC Weekly CCCT Progress Report (1/10/11 1/15/11)€¦ · Page 1 of 21 OSUMC Weekly CCCT Progress...
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OSUMC Weekly CCCT Progress Report (1/10/11 – 1/15/11)
Plan View of Project Site
This past week’s (1/10/11 through 1/15/11) construction activities:
Erection of tower crane no. 1 on the north side of the project
Erection of tower crane no. 2 on the south side of the project
Continue Auger cast piles installation in Phase 1A West Core and on the south end of Phase 2
Continue installation of tiebacks on the north and south sides of Phase 1B, as well as excavation on the
north and south sides of Phase 1B
Pour the underpinning pit at the northeast corner of Phase 1B
Preparation for concrete pile caps at Phase 1A West Core and extensive rebar deliveries
Complete temporary ramp and stairs
Next week’s (1/17/11 through 1/22/11) construction activities include
Continue installation of auger cast piles at Phase 1A (north), Phase 2 and start Phase 1B (south)
Complete excavation and stone in Phase 1B (south) and entire Phase 3 and Phase 4
Tower Crane No. 1 and No. 2 operational for contractor usage starting Tuesday, January 11, 2011
Continue on 2nd
underpinning pit at northeast corner of Phase 1B
Start excavation West Core on Monday, January 17, 2011
Planning of pile cap installation for Phase 1A and Phase 2
Complete installation of temporary enclosures at Tower Cranes No. 1 and No. 2
Installation of lights at Tower Cranes No. 1 and No. 2
Temporary power to trailers and prefabrication items at warehouse
Tower Crane No. 1
Tower Crane No. 2
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Above are photographs of the CCCT site from the North/South Cannon parking garage
showing this week’s activities.
Tower Crane No. 1 and No. 2 Installation
Both Tower Crane No. 1 and Tower Crane No. 2 went through all five stages listed below:
• Stage One: Excavation and Retention System Lagging for Tower Crane Base
• Stage Two: Setting Reinforcing Steel, Anchor Stools & Concrete Mat Installation
• Stage Three: Mobilization of the Two Assist Cranes
• Stage Four: Erection of Tower Crane Components
• Stage Five: Third Party Inspection of Tower Cranes & Anti-Collision Checks/Test
Runs/Contractor Usage
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Stage One - Excavation and Retention System Lagging for Tower Crane Base
Excavation for Tower Crane No. 2 that is to
grade, prior to the 4” mud mat being poured.
Modifications to the size of this Tower Crane
pad had to be made due to several
circumstances including an active waterline
and gas line 12” beyond the vertical lagging on
the right hand side of the photograph. This
photograph was taken in the late night hours.
One construction motto is, “We do what it
takes to maintain schedule but do not sacrifice
quality or safety”.
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Retention system installation for Tower Crane
Pad No. 1 on the north side of the site. Notice
the four large 24” diameter auger cast piles
when chipped down will support the tower
crane pad.
At this point in the stage, the excavation still
needed to go down approximately 3 more
feet.
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Mud mat for Tower Crane No. 1 on the north
end of the site. The center 2 ½”diameter bars
and the four auger cast piles still need to be
cut and chipped down to the appropriate
elevation.
Tower Crane pad No. 1 had to be at the
basement elevation for more stability.
Ultimately the front side of this area is lagged
and in the summer of 2011 the area around
the Tower Crane will be backfilled with a
granular material.
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Stage Two – Setting Reinforcing Steel, Anchor Stools & Concrete Mat Installation
Installation of the bottom mat of reinforcing at
Tower Crane Pad No. 2 on the south side. The
four auger cast piles have been chipped down
to the proper elevation. The 2 ½ “ diameter
center bars still need to be trimmed and a
steel plate installed at the top with large nuts
holding the plate at a specific elevation slightly
below the top mat of reinforcing. Notice the
four small concrete pedestals that will
temporarily support the Tower Crane spool
piece as shown on the next photograph.
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Tower Crane No. 1 Photo showing the
retention system, reinforcing mat, the top of
the stools sticking above the reinforcing and
the first section of the Tower Crane with the
associated ladder.
This was formed on the front side and poured
on 1/6/11. Notice the retention system lagging
on both sides which ultimately support backfill
around the foundation walls. This tower crane
will actually sit in a hole for stability purposes.
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Tower Crane pad No. 2 was poured 1/5/11.
The stools for the four tower crane legs are
permanently cast into the concrete and will be
abandoned later when the tower crane is
removed which includes the blue tower
sections. Tower Crane pads are generally
abandoned in place and always a minimum of
5’ below the ground surface so other utilities
and features can be constructed above the
concrete pad.
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Terracon Test Reports
Due to the timing of both tower crane mat pours high early strength concrete was utilized. Tower
Crane No. 2 concrete strength was 5,870 psi after two days and Tower Crane No. 1 concrete strength
was 6,830 psi after four days. 5000 psi was needed prior to setting the Tower sections.
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Assist Crane Information - HTC 8690 and GMK 7550
Assist Crane – HTC 8690
• 90-ton (81.65 mt.) Hydraulic
Truck Crane
• 237 ft. maximum tip height
• 62.3 mph travel speed
• 445 hp Detroit Diesel engine
with 1,450 ft-lbs of torque
• The cost of this machine is
around $1.5 million.
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Assist Crane – GMK 7550
• 550 ton capacity
• 197 ft 5 section full power
boom
• 430 ft overall tip height
• 53 mph travel speed
• 264,000 lb hydraulically
installed/removed
counterweight
• The cost of this machine is
around $5 million.
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Stage Three - Mobilization of Assist Cranes
The GMK 7550 large Assist Crane
that will perform the bulk of the
work done in the erection of the
Tower Cranes.
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The GMK 7550 large Assist Crane
installing the ballast counterweights
at the mid section of this crane.
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The HTC 8690 small Assist Crane
moving into position at the south
Tower Crane No. 2 erection area.
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Stage Three - Mobilization of Assist Cranes (continued)
Sections of the GMK 7550 large
Assist Crane jib being unloaded.
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Jib section for the GMK 7550 large
Assist Crane being installed on the 5
section full power boom.
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Another angle of the jib section for
the GMK 7550 large Assist Crane
being installed. Notice the erector is
tied off to the cable line that runs
the length of the power boom.
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The GMK 7550 large Assist Crane is fully erected and ready for Tower Crane
assembly beginning on early Saturday, January 8, 2011. The smaller HTC 8690
hydraulic truck crane will assist in unloading the tractor trailers with Tower
Crane No. 2 components.
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Tower Crane Facts Tower Crane – SK575
• Maximum Job Length: 262.5 ft
• Capacity at Maximum Length: 8598 lbs at the very end of the main jib
• Maximum capacity: 70548 lbs
• The cost of a new SK575 Tower Crane is around $1.2 million
• It takes the operator 30 minutes to climb from the bottom to the top.
• When winds get to 30 mph, the tower crane operation is shut down.
• Tower Crane No.2 Radius: 262’6”
• Tower Crane No.1 Radius: 262’6”
• Tower Crane No. 2 (South) height: initially 292’-3”, ultimately 408’3”
• Tower Crane No. 1 (North) height: initially 272’11”, ultimately 388’11”
Note: Both Tower Cranes are extended upward another 116 feet vertically in July 2011 for
Tower Crane No.1 and in October 2011 for Tower Crane No.2.
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Tower No. 1 & Tower No. 2 Comparison
Tower Crane Components
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Tower Crane Components (continued)
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Stage Four: Erection of Tower Crane Components
Saturday Morning and the 2nd section of the
Tower is being installed. The weather was
overcast and a balmy 18˚ F.
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Midway up with Tower Crane No. 2 tower
sections. Notice the expanded mesh platform
the erectors are standing on and the fixed
climbing ladder in the center of the Tower
Crane.
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About 75% of the way up with the south Tower
Crane sections on Day One of the erection
process.
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Stage Four: Erection of Tower Crane Components (continued)
Almost to the top, installing Tower Section No. 11.
2 ½ sections still need to be installed. Notice the
bump out in the middle of this photograph; this is
called the climbing rig. Earlier in this report we
mentioned that both Tower Cranes will be
extended upward another 116 feet vertically. The
climbing rig allows this very delicate operation to
take place by unbolting 2 Tower sections from one
another and inserting another Tower section. This
is repeated multiple times until he ultimate height
of both Tower Cranes is unsupported or free
standing. The ultimate height requires a temporary
structural steel tieback to the building structure.
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Sunday 1/9/11 the 27,000 lb turntable with the
operators cab set on top of the last Tower section.
Once this is bolted down the stressing of the bolts
(4 per leg and 16 per section connection) can
commence. The power pack utilized hydraulically
stretches the bolts, nuts are installed and the
tension released to create a high strength
connection. The hydraulic power pack does not
function well in cold temperatures (9˚ F on Sunday).
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Tower Crane No. 2 counterweight jib is being
hoisted into place. The view is somewhat blocked
by the auger cast pile rig in the foreground.
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Stage Four: Erection of Tower Crane Components (continued)
Tower Crane No. 2 main jib is held in place by
the large Assist Crane. The load will be
released after the cables are in place
supporting the main jib.
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Tower Crane No. 2 cable supports being
installed and tightened for the main jib. After
these have been installed properly the GMK
7750 can release the load. Notice the 3
erectors perched on the Tower Crane main jib
catwalks that are essentially 12” wide.
Yes, they are all tied off.
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On Monday, 1/10/11 Maxim moved their
operation to the north side on the project site
to begin assembling the GMK 7750 large Assist
Crane. On Tuesday, 1/11/11 Tower Crane No. 2
assembly began.
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Stage Four: Erection of Tower Crane Components (continued)
Tower Crane No. 2on the south side is hauling
the 10,000 lb test weight on the main jib. This
is a critical step in the final testing of the
stability of the Tower Crane.
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It is now 8:30 PM on Monday night and the
assembly of the jib for the GMK 7550 is
nearing completion.
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The climbing rig is almost ready for installation
on the outside of the Tower section for Tower
Crane No. 1 on the north side.
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Stage Four: Erection of Tower Crane Components (continued)
On Tuesday, January 11, 2011 the snow fell on
our erection crew for Tower Crane No.1 on the
north side. Proper safety applications are still a
priority as they continue on with the Tower
Crane sections.
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It is still snowing and the Tower Crane erectors
are almost half of the way up with the Tower
sections for Tower Crane No.1.
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Finally the last section of the tower for Tower
Crane No. 1 on the north side of the site. The
GMK 7550 large Assist Crane still has the
capabilities to go higher. The 5th section of the
power boom still has another 20’ that could be
extended.
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Stage Four: Erection of Tower Crane Components (continued)
The last section of the tower about to be
installed. 3 erectors who are all tied off will
land this section and bolt it up to the four legs.
It is still snowing so the steel members are
rather slick.
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What is necessary to run an electric powered
Tower Crane? The SK575 Hammerhead Tower
Crane requires 480 volts, 3 phase, and 350
amps to power all the Tower Crane
components. The black power cable coming
out of the bottom of the disconnect box is
attached to the turntable/operator cab
assembly and checked for proper function
while it is on the ground.
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The three erectors are awaiting the arrival of
the final jib section for the north Tower Crane
No. 1.
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Stage Four: Erection of Tower Crane Components (continued)
The last section of the main jib for the Tower
Crane No. 1 is almost in position to bolt the 2
ends together and tie-in the support cables.
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The counterweights are being installed on the
counterweight jib on Tower Crane No. 1. This
generally signifies the assembly of the Tower
Crane is almost complete.
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Both Tower Cranes were fully assembled on
Thursday, January 13, 2011 in the afternoon.
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Stage Five: Inspection of Tower Crane/Test Runs
Maxim Tower Crane Erection Crew
Descriptions of Inspection/Test runs:
10,000 lb concrete dead man test was hoisted and maneuvered successfully for Tower
Crane No. 2 on January 10, 2011 and Tower Crane No. 1 on January 13, 2011.
Third party inspections for both Tower Cranes will take place Monday, January 17,
2011. The inspector will review all connections, lift capacities in addition to other
properties.
Anti-collision device testing to make sure the alarm systems are activated and working
properly. This will notify the operators of impending danger when the main jibs
and/or hoist cables are nearing each other.
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Service Life of the Tower Cranes on
ProjectOne:
Tower Crane No.1 Tuesday, January 18, 2011 through May 2012
Tower Crane No.2 Tuesday, January 18, 2011 through May 2012