Cost of prefabricated cellar: Assessing the necessary cellar size?

  • Erstellt am 2023-03-22 18:50:17

darksun

2023-03-22 18:50:17
  • #1
Hello,
we are building with a basement; a prefabricated basement is (or was) installed.
The side walls and ceiling parts were delivered as precast concrete parts and lifted into the correct position with a crane.

In the construction start-up meeting, it was noted that instead of the 50t crane, an 80t crane might be necessary, "clarity only after inspection by the crane company."
Important, because the flat rate price only includes a 50t crane!

For me, it was already unclear back then why a larger crane would be necessary, since the crane comes quite close to the floor slab.

In fact, it was 6.50m away from the floor slab, but it could have easily driven to within 4 meters of the floor slab. (which is rather a "normal" distance for a crane to the floor slab, or is it "standard" that such a crane (with a 6m wide boom!) must be able to drive up to 2m to a floor slab?)

Presumably, the basement builder did not care about the crane size because we, as the builders, have to pay these additional costs.
The crane company does not want to comment to me, as I was not the client (that is the basement company).

Also, we were not informed of the result of the "inspection" beforehand. Rather, after the basement installation, a supplement was urgently sent by email requesting confirmation of these costs as soon as possible because the basement installation was planned for the end of March (?! But the basement has already been standing for a day!!).

The foreman also said that the large 80t crane was necessary because the basement walls were so heavy, and not because of the length of the required crane boom.

Is there anyone here who is familiar with 50t or 80t cranes and can or wants to "assess" the construction site (aerial photo available with floor slab and crane)?
After all, it's about 4,000 euros being claimed...
 

Osnabruecker

2023-03-22 19:43:58
  • #2


According to which opinion? Load-free strips must remain around the excavation pit, especially with such high point loads.
 

Allthewayup

2023-03-22 20:27:02
  • #3
Is this referring to a mobile crane or a tower crane?
 

darksun

2023-03-22 20:57:41
  • #4
Hello,
it is about a mobile crane that came for basement installation and left after 2 days.

There is no "excavation pit" in that sense; due to the slope, the side where the mobile crane worked is at the same level as the floor/basement slab. So access is almost up to the floor slab (and not to an "excavation pit"). On three sides around the floor slab it goes "up".
Attached is a rough sketch, the floor slab measures 9 x 11 meters,
yellow shows where the mobile crane stood, blue where it could also have been positioned.
 

maulwurf79

2023-04-08 07:22:16
  • #5
4000 euros more? I rented a tower climber for 5 weeks and only paid 4500 in total. But that seems very expensive to me.
 

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