Sarona

The Sarona Project is the largest jet grout bottom plug ever conducted in Israel (approximately 5.5 dunams.) The plug included approximately 5,000 boreholes of various diameters. It was carried out to significantly reduce groundwater penetration at the bottom of the pit, thus enabling the main contractor at the site to construct a raft below the groundwater level.

The execution included approximately 4 jet stations operating in parallel, which supplied high-pressure grout to four machines of different sizes and dimensions, each operating under a different height limit (ceilings, beams, scaffolding, and the like.) All this was carried out in parallel with the skeleton work carried out by the main contractor in the Electra Construction project. It should be noted that the estimated water penetration without the cap was estimated at approximately 170-200 m3/h, and following completion of the plug, it was significantly reduced to 2.5 m3/h. In addition, parallel to the jet drillings, a dewatering system was installed, including approximately 12 pumping wells to treat the trapped water and any excess water that penetrated from the bottom of the pit.

In addition, the company executed hundreds of steel and polymer anchors using the Lipsker method, many of which are beneath the groundwater level and under water pressure.