Activity Feed › Discussion Forums › Strictly Surveying › Tower crane plumb monitoring?
One other aspect is that as the building goes up, if you have your axis lines set on the floors, you can use them to read the crane, instead of being on the ground.
We are currently checking several cranes in NYC, including one at 59 stories, eventually going to 82 (950 feet with a 200 foot spire at the top).
AJF
Side shot at FL/GA………………..loveable??????? Really????????
- Posted by: Pronker
Lee – what is the easier method? We all want to know 🙂
A four foot level taped to a 10′ 2×4?
- Posted by: RoadhandPosted by: Pronker
Lee – what is the easier method? We all want to know 🙂
A four foot level taped to a 10′ 2×4?
I work directly for a concrete contractor. We sub out the erection of our tower cranes to the crane company, but are required to monitor it ourselves. If you are monitoring only, then all you have to do is shoot elevations on the legs of the crane and monitor only those marks. That is all that is required. If you attempt to monitor plumpness of the entire structure, you will find it moves all over the place.
- Posted by: Gil Wright
I work directly for a concrete contractor. We sub out the erection of our tower cranes to the crane company, but are required to monitor it ourselves. If you are monitoring only, then all you have to do is shoot elevations on the legs of the crane and monitor only those marks. That is all that is required. If you attempt to monitor plumpness of the entire structure, you will find it moves all over the place.
That is exactly how we are doing it.
After talking to everyone involved, we decided that the top of the crane will move way more than our limit so we are monitoring the four corners of the tower/ anchor bolts by simply using a level with a metric rod and reading millimeters.
Hit the bottom on a flange and the top on the same flange reflectorless. That’s how I’ve done it. Tower cranes can easily sway as much as you describe when loaded. Make sure boom is in basically the same orientation at each check.
Following along on this thread, have any of you done monitoring of the outside AND the inside of a building?
The outside seems straight forward with proper control and targets but a potential client also wants to monitor displacement inside existing structure at existing columns and walls.
John
- Posted by: johnhls
Following along on this thread, have any of you done monitoring of the outside AND the inside of a building?
The outside seems straight forward with proper control and targets but a potential client also wants to monitor displacement inside existing structure at existing columns and walls.
John
You should probably start a new thread topic.
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