Monday, March 27, 2017

Erecting Precast Buildings: Tilting and Setting

I've already discussed the use of precast concrete beams for building bridges. This posting captures what I learned from about erecting buildings with precast components. We start with what can go wrong, which is what precipitated all of the comments and pictures about tilting walls and setting floors.

Devin Parsons posted
So this happened today my buddy JD had do do some demo clean up... This trip 9 was only on the job site a few days. Operator is alright suffered a broken ankle from when he bailed out and ran.
Tony Snoke commented on the above posting
Eric S Manners What happened
Devin Parsons Not 100% sure I asked JD if he had heard much. All he said was the operator heard the boom buckle and he bailed.
Scottie Thompson From what I've heard he was walking high sticked with a precast panel.

I gather that "high stick" means the boom was too vertical so that the panel was dangling too close to the boom.

Some comments speculated that the boom was not properly inspected. But someone said that, since it was an "All" crane, the boom segments would have been inspected as they arrived on the truck and then the whole boom would be inspected again after assembly before the boom is raised. This time they can skip the inspection at the end of the job for any damage.

Jerry Spearn Walking high boom there is a good chance the piece made contact with the boom. There is a video some place of a boom test being done . At 85% capacity they hit the main cord with a ball peen hammer and the boom exploded. I'll see if I can find the video.

Ben Stalvey So glad the operator is okay that 999 can be replaced they are a dime a dozen really.

Ben Stalvey Aaron Nelson I am sure can tell you all about hauling precast and how dangerous it can be. His company hauls alot precast and are around cranes that lift precast alot. It takes alot skill from the driver and crane operators really. On even just delivery and then the flip of them on a jobsite.

Aaron Nelson And is exactly why I won't allow my drivers to bring their kids with them, this stuff is way to unpredictable and I don't want that on my conscience. Job we're on now has 80k wall panel and 90k beams.

Ben Stalvey Very true several cranes have went down in time during tilt wall precast work

Louie Dee See a lot of these companies using hydro crawlers for precast

Ben Stalvey Around here locally I see that also. Less setup time less risk to then running a crawler crane

Louie Dee commented on the above posting
Dane Bortzfield commented on the above posting
They still get the job done
Jerry Spearn I've been doing lot of precast with a 999 lately. Never an issue. This looks like a TILT UP operation not a precast project. I've done many tilt ups using a Liebherr 1300. I've also done them with a 4100. You definitely need to be on your A game and paying attention when tilting with a full hydraulic lattice boom crane, be it a crawler or truck mount.

Jerry Spearn commented on the above posting
Tilt up
[Note the panels laying on the foundation ready for the tilt up.]
Jerry Spearn commented on the above posting
Brandon Schmitt Suicide walls eh?

Aaron Nelson commented on the above posting
 This is cool pic of an 80k wall we picked last week, the amount of flex in that piece is amazing.
Jerry Spearn commented on the above posting
216,000 pound tilt panel. 58' tall 40' wide 10" thick
Joe Hinson commented on the above posting
 It's was a tilt up job the trip 9 was out of the Raleigh office on bare rent he was trying to back up a hill with a 140 thousand pound panel and the hill was about 5 degrees off to the right too.
Jerry Spearn Did he take the time to read the manual? It explains very Clearly what amount of load can be picked and carry over what type of terrain. It even gives you a direction of travel and if cwts [counter weights] are up hill or down hill. Always refer to the manual when doing a pick and carry.

Joe Hinson commented on the above posting

Joe Hinson commented on the above posting
A video

Joe Nirmaier Anytime something like this happens, it's detrimental to the crane industry, and especially the operators. Its stuff like this, that will be the reason for totally cast in place walls. As an industry, we will be pricing ourselves out of the market pretty soon.

Charles Hall posted
[We have already seen this picture. But some of the comments provide some insight.]
Keith Gregory Who is in charge of securing these dam walls?Devin Parsons Wasn't the wall securement the crane was off by 5 degrees to the right and with that much stick it sent the boom over.Devin Parsons Crane off level 5 degrees sent the boom crashing down panel was 140k.
Joe Whiting Saw this last week it said he was traveling up hill off the side with the wall...I thought well that may do it.
Terry Blair commented on the above posting
Brian Edwards commented on the above posting
Tom White posted two pictures with the comment: "T M C gettin down with some precast in lagrange ga."

Chris Ludlow posted
Triple 8 setting rock, 50T Grove truck mount hanging iron on the stair tower, and an 860 JLG just because.
Chris Ludlow It was tight quarters for sure! They needed us to get the stair tower erected so they could set the precast stairs right after to finish the garage and tear down the 888 right after. I'd worked with the 888 operator before and he's pretty smooth, set that panel right in there with out a problem.
[Lots of comments about this being a safety rule violation because people are working inside the "fall radius." If they did not violate the rule, they would have had to pay rental for 4-5 days for an expensive crane to set idle. while the steel for the stairwell was erected.]
LR Willson & Sons Inc posted
Aerial perspective of LRW crews erecting a Data Center in Northern Virginia earlier this year. These 62' tall tilt up panels weighed up to 170,000#. We utilized a Manitowoc 16000 440 ton crawler crane.
Bay Crane posted
Bay Crane posted
Skylor Huffine Pre cast tilt up
Thomas Dearmond posted
The dangers of tiltwall, and for the record this wasn't one of my jobs.
Greg Vandeventer Tilts have been and will be the most dangerous thing to be done with a crane.
[The comments indicated this happened while the panel was being walked into place and the boom was "side loaded." I surmise the crane tilted. There is no discussion of what kind of ground preparation and/or matting was done. One comment implied a Manitowoc 999 was not big enough for the job.]
John Daniel commented on Thomas' posting
Thomas Dearmond commented on Thomas' posting

John Daniel commented on Thomas' posting
Thomas Dearmond posted as comments a couple of photos of lifts going well. I assume these are jobs that his crew has done.


Thomas Dearmond commented on a posting
Hobby lobby I did a few months back

Jamey Clark posted five photos with the comment:
NessCampbell Cranes 2250 and Sierra Construction Company INC erecting tilt walls in Tacoma, Wa. My first experience tilting with a crawler from the outside. I'm sold! 3.5 days 101 panels up 71 to go! Nice job by all!
Josiah Shirley Makes it so much easier!!!
Jamey Clark I agree. Moving a hydraulic or lattice boom on rubber around the outside is a lot of effort. Each move you have to drop bar, if hydraulic crane they suck the boom all the way in prior to rolling. Takes to much time. I would choose this crane every time if the mobe cost wasn't a 75% increase over a rubber tire rig.
Jamey Clark Very versatile rig, but expensive!
David Beard Have hung many precast panels. A good job with the right crew. Enjoy it myself.

1, cropped


James Hughy Eads posted two photos.

A video of building a wall with precast segments between already constructed columns. This looks safer than tilting.

A video of standing wall panels. (source) I wish he had spent some of the dead time panning up to the top of the boom so that we could see how the different lines were spaced at the top. Note the bracing on the truck trailer so that they can be shipped diagonally to take advantage of the vertical clearance and avoid a horizontal oversize load. When the built parking garages where I worked, they shipped the floor spans on a diagonal until a union forced them to ship horizontally and pay extra.

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