Open pit protection – MP Projekt, Opatija
For business / residential building with swimming pool and retaining walls, we executed an open pit protection.
The location of the building is located in Opatija, between the Nova Cesta and the Marshal Tito Street.
Pile wall of reinforced concrete drilled piles and pit excavation were executed for the building. The excavation and open pit protection was executed in height of approximately 15.0 m. Excavation was executed vertically, along with the edge of the lot. During exploration and investigation works, the surrounding terrain was built and other objects were located along the edge of the lot.
The excavation was executed within the cover material (geotechnical unit 1 – made ground (AF) and geotechnical unit 2 – terra Rossa (Qts)) and within bedrock (geotechnical unit 3 – limestone breccia (K1)).
Pile wall was executed of reinforced concrete drilled piles with nominal diameter D = 400.0 mm in cover material, and with nominal diameter D = 310 mm in bedrock at a horizontal distance of 1.50 m. Also, a condition for piles input into a rock mass was set up to at least 1,0 m. Depending on the terrain condition, the length of the piles was adjusted depending on the depth of the rock mass.
The excavation was executed in phases. After each excavation phase the anchors Type1 or Type2 were installed, depending on the position of planned open pit measures. For pile wall resistance on a horizontal action, self-drilling anchors Type1 were installed.
The lower part of open pit (under the pile wall, within the rock mass) was protected by the installation of Type 2 rod anchors.
At the position of uneven surface, concrete pillows were executed to complete open pit. Addition to all other protection measures drains in length of L = 2.0 were executed to eliminate the possibility of hydrostatic pressure behind shotcrete.
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