Strengthening the ground with leveling the three-story building with underground parking basement

Re-leveling the building premises
Category
Multi-storey residential buildings
Object
Three-storey residential building with underground Parking
Focus
Strengthening the base and correcting the roll
Location
Kazahstan, Almaty
Time of work
2018 г.
The timing
5 days
TECHNOLOGY
DEEP INJECTION & SLAB LIFTING

Problem:

The building foundation area was located in the immediate vicinity of the artificially created pit. A retaining wall was constructed as a protective structure against the collapse. After completion of all construction and installation works and before putting the house into operation, several cycles of geodesic surveys detected foundation subsidence with a roll towards the pit. After the survey and collection of loads on the building, the insufficient load-bearing capacity of the ground was determined.

Foundation:

Reinforced concrete slab with a thickness of 800 mm.

Objective:

Strengthen the foundation soil & eliminate the foundation roll. Re-level the building by lifting as much as possible without damaging the structural elements.

Solution:

Before starting the work on strengthening the base, a set of works was carried out to determine the density of the base and identify low-bearing horizons of the soil thickness. Also, the 0-th cycle of geodesic monitoring syrvey was performed of the foundation slab and facades, to determine the height differences and roll of the building.

To solve the problem of strengthening the ground, the method of DEEP INJECTION was chosen. All work was carried out on the -1 floor (underground Parking), injection was performed in several levels, strictly vertically.The method chosen for lifting the building was SLAB LIFTING. Injection was performed in parallel by two working crews, strictly according to the specified plan and in the order of designed project. The maximum lift was 17 mm, without damaging structural elements.

After the completion of work on strengthening the foundation soil and lifting the building, a set of geodetic works was performed to install control benchmarks for further monitoring of the vertical and horizontal displacements of the building.

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