Cairo Metro Line3 / Medinah Car Park II Cutter Excavated Diaphragm Wall with Water Bars 0.00 m principal section wall width: 800 (1200) mm -15 (35) m -45 (60) m Rock (sand)

Cairo Metro Line3 / Medinah Car Park II Cutter Excavated Diaphragm Wall with Water Bars 0.00 m Requirement by the Specs: Water-stop bar, down to approx. 2 m below cut depth -15 (35) m -45 (60) m Rock (sand)

BAUER End-Stop / Water-Bar System Concreted panel excavated panel water bar

BAUER End-Stop / Water-Bar System exposed joint with two water bars system with one or two water bars

BAUER End-Stop / Water-Bar System end-stop beams for water-bar system; single water-bar double water bar

Practical Limits of the End-Stop System primary panel No possibility to install and extract the end-stop beam to depths > 35 (max. 40) m max. depth of stop-end beam: ~ 35m cut depth Rock

Execution of Water-Stop System Joints in combination with Cutter excavated DW trench Rock 1 2 Waterproof joints in zone 1 (max ~35 m) will be ensured through the installation of water-bar system Interlocking between the DW panels is achieved due to the shape of the stop-end element form No possibility for over cutting in zone 2 No interlocking of adjacent DW panels The joints in zone 2 will not be waterproof w/o addtl. measures Waterproofing may be achieved by means of "Tube a Manchette" Injection behind the joint

Execution of Water-Stop System Joints in combination with Cutter excavated DW trench concreted primary panel secondary panel Execution of Secondary panel Loosening of the End-stop beam after completion of the whole DW secondary panel excavation and regeneration of the slurry Loosening of the beam by means of Vibrating unit and/or chiseling

Execution of Water-Stop System Joints in combination with Cutter excavated DW trench Water stop Strip Primary panel Secondary panel spacers Additional spacers of approximately 2,5 cm shall be installed on both sides of the cutter The teeth of the cutter shall not touch the End-stop steel beam Concrete on the surface of the End-stop steel form shall be removed by a cleaning chisel Additional spacers shall be installed in the upper part of the frame of the cutter in order to prevent tilting Water stop panel Cutter

Working sequence - 3 bites primary panel, 1 bite secondary panel cutter more end-stop beams are necessary, bigger amount of joints secondary panels shall be at least 10 cm wider than the frame of the Cutter, to avoid risk of clamping of the cutter in case the water-stop form is not perfectly vertically installed

Working sequence - 3 bite primary panel, 3 bite secondary panel cutter less End-stop beams required, less joints no risk of clamping of the cutter even if the water-stop steel form is not vertically installed

Working sequence - 3 bite panels following each other subsequently starting panel Adjacent panel 1 Adjacent panel 2 cutter same number of joints and water-stop beams as by 3 bite primary- 3 bite secondary panel working sequence no risk of clamping of the cutter even if the End-stop steel form is not vertically installed