Project: Production workshop under reconstruction
Location: Yaroslavl
Year: 2018
Duration: 2 days
Technology: SLAB LIFTING
Strengthening the foundation and floor structures in an industrial building to withstand additional loads
Problem
Insufficient bearing capacity of the base.
Solution
Strengthening the foundation to withstand increased loads
Problem
Task to be solved:
Strengthening the soils to achieve the required strength and deformation properties of the foundation beneath supports in a building without dismantling existing structures.
Initial data:
The production workshop modernisation project included the construction of a mezzanine, the load‑bearing supports of which were to rest on the existing reinforced concrete floor. However, relevant studies and calculations showed that the bearing capacity of the foundation beneath the floor structure was insufficient to support the loads from the proposed supports. Therefore, the design organisation proposed installing additional foundations for them. This would require cutting openings in the floor for the mezzanine support foundations, which did not satisfy the customer.
Goal:
Strengthen the soils under the floors at the locations of the mezzanine supports to achieve the required strength and deformation properties of the foundation in local strengthened zones, ensuring the ability to withstand the loads transmitted by the supports.
Strengthening the soils to achieve the required strength and deformation properties of the foundation beneath supports in a building without dismantling existing structures.
Initial data:
The production workshop modernisation project included the construction of a mezzanine, the load‑bearing supports of which were to rest on the existing reinforced concrete floor. However, relevant studies and calculations showed that the bearing capacity of the foundation beneath the floor structure was insufficient to support the loads from the proposed supports. Therefore, the design organisation proposed installing additional foundations for them. This would require cutting openings in the floor for the mezzanine support foundations, which did not satisfy the customer.
Goal:
Strengthen the soils under the floors at the locations of the mezzanine supports to achieve the required strength and deformation properties of the foundation in local strengthened zones, ensuring the ability to withstand the loads transmitted by the supports.
The project in detail
Technology applied:
The task was solved by the DEEP INJECTION method according to URETEK technology, which involves injecting URETEK polymer composition into the soil in local zones under the floors at the locations of the mezzanine supports. This mixture, upon rapid hardening, expands and creates pressure that compacts the soil, improving its physical and mechanical characteristics under the floor, enabling it to withstand the compressive loads transmitted by the mezzanine supports. In total, 18 injection points were implemented, with the solution injected into the soil at different levels directly under the existing floor structure through small‑diameter holes drilled in the floor at the locations of the designed mezzanine supports.
The task was solved by the DEEP INJECTION method according to URETEK technology, which involves injecting URETEK polymer composition into the soil in local zones under the floors at the locations of the mezzanine supports. This mixture, upon rapid hardening, expands and creates pressure that compacts the soil, improving its physical and mechanical characteristics under the floor, enabling it to withstand the compressive loads transmitted by the mezzanine supports. In total, 18 injection points were implemented, with the solution injected into the soil at different levels directly under the existing floor structure through small‑diameter holes drilled in the floor at the locations of the designed mezzanine supports.
Solution
Result:
The effectiveness of the foundation strengthening was confirmed by laser monitoring during the injections – by the vertical lift of the floor and the support structures mounted on it by an average of 0.5 mm – and by dynamic probing of the soil before and after injection of the polymer composition, which revealed an improvement in the mechanical parameters of the soil by up to four times. The work lasted 2 working days.
The effectiveness of the foundation strengthening was confirmed by laser monitoring during the injections – by the vertical lift of the floor and the support structures mounted on it by an average of 0.5 mm – and by dynamic probing of the soil before and after injection of the polymer composition, which revealed an improvement in the mechanical parameters of the soil by up to four times. The work lasted 2 working days.
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