1. 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)

2. 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)

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

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

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

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

12. 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