CIPP UV construction for urban pipeline repair via trenchless
renovation
UV curing repair material selection:
The structure of all imported glass fiber + resin used for UV
curing is divided from outside to inside: UV protective film, outer
film, glass fiber fabric, and inner film (dragged out after
curing).
UV curing repair method:
The structure of all imported glass fiber + resin used for UV
curing is divided from outside to inside: UV protective film, outer
film, glass fiber fabric, and inner film (dragged out after
curing).
(1) Pipe pretreatment
The sewer before repair shall be blocked, pumped, and dredged, and
a CCTV inspection shall be carried out before repair. Local
cutting, plastering, grouting, and other auxiliary measures shall
be added for serious defects.
(2) Pull in the bottom film and pull in the lining hose
The bottom film can reduce the drag resistance of the lining
material, and also reduce the damage to the lining caused by the
occasional protrusions on the inner wall of the original pipeline.
(3) Fixed tie
Fixing the binding head is a part of all UV curing processes that
require high operator experience and proficiency. The binding head
shall be firmly fixed to withstand the air pressure blown into the
pipe by the fan during the curing process. Firstly, it is
convenient for the installation of the lamp holder in the next
step, and secondly, it ensures that the inner lining pipe is close
to the original pipe wall.
(4) Feed-in lamp holder
According to different pipe diameters, the UV lamp holder is
divided into four models: small, medium, large and extra-large. The
repaired pipe diameter can cover all sizes of dn150-dn1600. Turn on
the fan and air compressor to supply air into the pipe. After the
inner lining pipe is inflated, quickly send the lamp holder into
the pipe. Pay attention not to scratch the inner lining membrane.
(5) UV curing
After the lamp holder is jointed at the end, turn on the UV lamp to
irradiate the inner lining pipe and start curing. Reasonably
control the travel speed of the lamp holder to ensure that the
curing process is completed at one time. The whole curing process
is monitored, and automatically recorded, and the curing speed and
pipe wall temperature are automatically recorded.
(6) Closeout
After curing, cut off the excess materials at the pipe end, remove
the airbag and restore the water supply.
| How | CIPP No dig |
| Application | Rainstorm |
| Length | Any length is possible |
