-
7/25/2019 1.2 Pipe Jacking
1/11
PIPE JACKING
-
7/25/2019 1.2 Pipe Jacking
2/11
ABOUT THE TECHNIQUE
It is generally referred as Micro tunneling
Pipes are pushed through the ground behind the shield
using powerful jacks.
Simultaneously eca!ation takes place within the shield.
"his process is continued until the pipeline is
completed.
"he method pro!ides a fleible# structural# watertight#finished
pipeline as the tunnel is eca!ated.
-
7/25/2019 1.2 Pipe Jacking
3/11
ABOUT THE TECHNIQUE Cont
$o theoretical limit to the length of indi!idual pipelines.
Pipes range from %&'mm to ('''mm diameter can be
installed in straight line or in cur!ature.
"hrust wall is pro!ided for the reaction of the jacks.
In case of poor soil# the thrust wall may punch inside the
soil.
"hen piles or ground anchoring methods can be used.
-
7/25/2019 1.2 Pipe Jacking
4/11
PROCEDURE
"he thrust pit and the reception pit are eca!ated at the
re)uired places.
"hen the thrust wall is set up in the thrust pit according
to the re)uirement.
In case of mechani*ed eca!ations# a !ery large pit is
re)uired.
+ut in case of manual eca!ation# a small pit is enough. "hrust
ring is pro!ided to ensure the e!en distribution of
stress along the circumference of the pipe.
-
7/25/2019 1.2 Pipe Jacking
5/11
"he number of jacks !ary upon the frictional resistance
of the soil# strength of pipes etc.#
"he si*e of the reception pit is to be big enough to
recei!e the jacking shield. "o maintain the accuracy of
alignment a steer able shield
is used during the pipe jacking.
In case of small and short distance eca!ations# ordinary
sur!ey method is sufficient.
+ut in case of long eca!ations# remote sensing and
other techni)ues can be used.
PROCEDURE Cont
-
7/25/2019 1.2 Pipe Jacking
6/11
GENERAL ARRANGEMENTS
-
7/25/2019 1.2 Pipe Jacking
7/11
PIPE JACKING SETUP
-
7/25/2019 1.2 Pipe Jacking
8/11
THRUST SETUP
-
7/25/2019 1.2 Pipe Jacking
9/11
COMPUTER GUIDANCE SYSTEM
"he computer system
enables us to control the
work remotely.
-
7/25/2019 1.2 Pipe Jacking
10/11
ADVANTAGES
It a!oids the eca!ation of trenches. So it is also called
as "rench less "echni)ue.
"here won,t be any leak problems in the future.
"imely finish of projects.
-
7/25/2019 1.2 Pipe Jacking
11/11
DISADVANTAGES
-ery costly method.
Skilled personnel is re)uired.
