ᐅ Crane Costs for Prefabricated Basements: How to Determine the Necessary Crane Size?
Created on: 22 Mar 2023 18:50
D
darksunHello,
we are building with a basement; a precast basement was installed.
The side walls and ceiling sections were delivered as precast concrete elements and lifted into place with a crane.
During the construction startup meeting, it was noted that instead of the 50-ton crane, an 80-ton crane might be required, with "clarity only after inspection by the crane company."
This is important because the fixed price only includes a 50-ton crane!
It was unclear to me from the start why a larger crane would be necessary since the crane can get quite close to the floor slab.
In fact, it was positioned 6.50 meters (21 feet 4 inches) away from the slab but could have easily moved to within 4 meters (13 feet 1 inch) of the slab. (which is a fairly typical distance for a crane from a floor slab, or is it "standard" that such a crane—with a 6-meter (20 feet) wide boom!—should be able to get as close as 2 meters (6 feet 6 inches) to a floor slab?)
Presumably, the basement contractor didn’t care about the crane size because we, as the clients, have to cover these additional costs.
The crane company refuses to comment to me because I am not the client (the basement contractor is).
Also, the result of the "inspection" was not communicated to us in advance. Instead, after the basement installation, we suddenly received an urgent email asking us to confirm these extra costs as soon as possible because the basement installation was supposedly planned for the end of March (?! But the basement has already been in place for a day!!).
The foreman also said the large 80-ton crane was necessary due to the weight of the basement walls, not because of the length of the required crane boom.
Is there anyone here familiar with 50-ton or 80-ton cranes who would be willing to "assess" the construction site (there is an aerial photo available showing the floor slab and crane)?
After all, it’s about an extra charge of 4,000 euros that is being requested...
we are building with a basement; a precast basement was installed.
The side walls and ceiling sections were delivered as precast concrete elements and lifted into place with a crane.
During the construction startup meeting, it was noted that instead of the 50-ton crane, an 80-ton crane might be required, with "clarity only after inspection by the crane company."
This is important because the fixed price only includes a 50-ton crane!
It was unclear to me from the start why a larger crane would be necessary since the crane can get quite close to the floor slab.
In fact, it was positioned 6.50 meters (21 feet 4 inches) away from the slab but could have easily moved to within 4 meters (13 feet 1 inch) of the slab. (which is a fairly typical distance for a crane from a floor slab, or is it "standard" that such a crane—with a 6-meter (20 feet) wide boom!—should be able to get as close as 2 meters (6 feet 6 inches) to a floor slab?)
Presumably, the basement contractor didn’t care about the crane size because we, as the clients, have to cover these additional costs.
The crane company refuses to comment to me because I am not the client (the basement contractor is).
Also, the result of the "inspection" was not communicated to us in advance. Instead, after the basement installation, we suddenly received an urgent email asking us to confirm these extra costs as soon as possible because the basement installation was supposedly planned for the end of March (?! But the basement has already been in place for a day!!).
The foreman also said the large 80-ton crane was necessary due to the weight of the basement walls, not because of the length of the required crane boom.
Is there anyone here familiar with 50-ton or 80-ton cranes who would be willing to "assess" the construction site (there is an aerial photo available showing the floor slab and crane)?
After all, it’s about an extra charge of 4,000 euros that is being requested...
O
Osnabruecker22 Mar 2023 19:43darksun schrieb:
could have easily driven up to 4 meters (13 feet) to the base slabAccording to which opinion? Load-free strips must be left at the excavation site, especially with such high point loads.
A
Allthewayup22 Mar 2023 20:27Is this referring to a mobile crane or a tower crane?
Hello,
this concerns a mobile crane that arrived for the basement construction and left after two days.
There is no "excavation pit" as such; due to the slope, the side where the mobile crane worked is at the same level as the ground/slab. So, access was possible almost up to the slab level (and not into an "excavation pit"). On three sides around the slab, the ground rises.
Attached is a rough sketch. The slab measures 9 x 11 meters (30 x 36 feet).
Yellow shows where the mobile crane was positioned, blue indicates where it could have been placed as well.
this concerns a mobile crane that arrived for the basement construction and left after two days.
There is no "excavation pit" as such; due to the slope, the side where the mobile crane worked is at the same level as the ground/slab. So, access was possible almost up to the slab level (and not into an "excavation pit"). On three sides around the slab, the ground rises.
Attached is a rough sketch. The slab measures 9 x 11 meters (30 x 36 feet).
Yellow shows where the mobile crane was positioned, blue indicates where it could have been placed as well.
M
maulwurf798 Apr 2023 07:224000 euros more? I rented a tower crane for 5 weeks and paid a total of only 4500. That seems very expensive to me.
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