OSUMC Weekly CCCT Progress Report (1/10/11 1/15/11)€¦ · Page 1 of 21 OSUMC Weekly CCCT Progress Report ... Tower Crane No. 1 and No. 2 operational for contractor usage starting

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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.

_____________________________________________________________________________________

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.

_____________________________________________________________________________________

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