1.CIPP (cured-in-place-pipe)
CIPP means that the lining pipe in special materials painted with polymer coating (PU or PE) at its outer layer is firstly dipped in the polyester resin or epoxy resin and then placed in pipeline by traction. After its lining is pulled in and aerated to hold up and closely cling to the inner wall of pipeline to be recovered. Subsequently, it is exposed under ultraviolet light or steam and hot water to make the resin generate the chemical reaction. The lining forms a new structural pipeline in the former pipeline after being cured.
Technical advantages:
a. Short period of construction being completed in about 8 hours generally.
b. Small area of land of equipment.
c. Durable and practical lining pipe with the maximum durability reaching 50 years.
d. Wide use applicable to repair of pipelines in any materials and shapes, including the transmutative pipeline
e. No excavation at all with excellent overall social and economic effects.
Representative project:
Repair Project for Rainwater and Sewage Pipeline and Inspection Well in North Xiti Road, Chengdu, etc.
2.Lining insertion recovery
(1)U-typed compression
Section U-typed compression refers to pressing the section of an HDPE lining pipe whose outer diameter is equal to or lower than inner diameter of pipeline to two-layer U-typed section by special U-typed reduction equipment so as to reduce the section of the lining pipe by about 40% and quickly insert it into the main pipeline and lining pipe in place, open pipe chamber by pressure and steam, make it recover round, cling to inner wall of outer pipeline and form pipe in a pipe.
(2)Isometric compression
Multilevel isometric compression refers to making multilevel reduction of an HDPE lining pipe whose outer diameter is slightly higher than inner diameter of the main pipeline, making its section keep round and area lower than area of inner section of the main pipeline, and quickly insert into the main pipeline under effects of traction. After the lining pipe gets in place, the diameter of the HDPE lining pipe rebounds and expands by its own memory characteristic or pressure and temperature and outer wall of the HDPE lining pipe is in interference, attaching to the inner wall of the main pipeline and forming a firm pipe in a pipe.
Technical advantages:
a. Short construction duration and small floor area of equipment without mechanical and dust pollution
b. Durable and practical lining pipe with the maximum durability reaching 50 years.
c. Mainly used in repairing the lining of water ductile iron pipe, cement pipe and steel pipe
d. Excellent conditions of water quality without secondary pollution
e. Small investment and low cost
Representative projects:
Water Supply PE Lining Repair Project in Laodong Road, Xi'an; Water Supply PE Lining Repair Project in Youyi Road, Xi'an; Water Supply PE Lining Repair Project in East Changle Road, Xi'an, etc.
(3)CCCP spray repairing method
CCCP spray technology refers to pumping the prepared special cement mortar recovery materials to high-speed rotary nozzle on the axle wire of pipeline driven by compressed air before materials evenly swing to inner wall of pipeline under effects of centrifugal force in high-speed rotation and rotary spraying equipment is driven by traction winch to slowly drive along the axial wire in the pipeline to make recovery materials form continuously compact lining layer in the pipe wall. CCCP technology is applicable to recovery of concrete pipe, clay pipe, brick pipe, casting pipe, steel pipe and plastic pipe; high-diameter sewer pipeline and storm sewer in particular; high-diameter water supply pipelines can be sprayed and recovered by improvement of materials.
Technical advantages:
a.Permanent and all-structural recovery is applicable to those whose pipe diameter is 0.25m-4.0m;
b. Fully automatic two-way rotary centrifugal spraying has even and compact coating;
c.Lining thickness may be flexibly designed concerning pipe diameter, buried depth, underground water, geology, pipeline damage and other situations and lining thickness may change in any pipe section, minimizing recovery cost;
d. Small dimensions in spray equipment with low one-off investment cost.
e.Its recovery structure is waterproof, corrosion-proof and free from reduction of overflow capacity, whose service life can be over 50 years in design;
Representative projects: Repair for Rainwater and Sewage Inspection Well in South Street, Xi'an; Repair for Inspection Well in North Xiti Road, Chengdu, etc.
CIPP means that the lining pipe in special materials painted with polymer coating (PU or PE) at its outer layer is firstly dipped in the polyester resin or epoxy resin and then placed in pipeline by traction. After its lining is pulled in and aerated to hold up and closely cling to the inner wall of pipeline to be recovered. Subsequently, it is exposed under ultraviolet light or steam and hot water to make the resin generate the chemical reaction. The lining forms a new structural pipeline in the former pipeline after being cured.
Technical advantages:
a. Short period of construction being completed in about 8 hours generally.
b. Small area of land of equipment.
c. Durable and practical lining pipe with the maximum durability reaching 50 years.
d. Wide use applicable to repair of pipelines in any materials and shapes, including the transmutative pipeline
e. No excavation at all with excellent overall social and economic effects.
Representative project:
Repair Project for Rainwater and Sewage Pipeline and Inspection Well in North Xiti Road, Chengdu, etc.
2.Lining insertion recovery
(1)U-typed compression
Section U-typed compression refers to pressing the section of an HDPE lining pipe whose outer diameter is equal to or lower than inner diameter of pipeline to two-layer U-typed section by special U-typed reduction equipment so as to reduce the section of the lining pipe by about 40% and quickly insert it into the main pipeline and lining pipe in place, open pipe chamber by pressure and steam, make it recover round, cling to inner wall of outer pipeline and form pipe in a pipe.
(2)Isometric compression
Multilevel isometric compression refers to making multilevel reduction of an HDPE lining pipe whose outer diameter is slightly higher than inner diameter of the main pipeline, making its section keep round and area lower than area of inner section of the main pipeline, and quickly insert into the main pipeline under effects of traction. After the lining pipe gets in place, the diameter of the HDPE lining pipe rebounds and expands by its own memory characteristic or pressure and temperature and outer wall of the HDPE lining pipe is in interference, attaching to the inner wall of the main pipeline and forming a firm pipe in a pipe.
Technical advantages:
a. Short construction duration and small floor area of equipment without mechanical and dust pollution
b. Durable and practical lining pipe with the maximum durability reaching 50 years.
c. Mainly used in repairing the lining of water ductile iron pipe, cement pipe and steel pipe
d. Excellent conditions of water quality without secondary pollution
e. Small investment and low cost
Representative projects:
Water Supply PE Lining Repair Project in Laodong Road, Xi'an; Water Supply PE Lining Repair Project in Youyi Road, Xi'an; Water Supply PE Lining Repair Project in East Changle Road, Xi'an, etc.
(3)CCCP spray repairing method
CCCP spray technology refers to pumping the prepared special cement mortar recovery materials to high-speed rotary nozzle on the axle wire of pipeline driven by compressed air before materials evenly swing to inner wall of pipeline under effects of centrifugal force in high-speed rotation and rotary spraying equipment is driven by traction winch to slowly drive along the axial wire in the pipeline to make recovery materials form continuously compact lining layer in the pipe wall. CCCP technology is applicable to recovery of concrete pipe, clay pipe, brick pipe, casting pipe, steel pipe and plastic pipe; high-diameter sewer pipeline and storm sewer in particular; high-diameter water supply pipelines can be sprayed and recovered by improvement of materials.
Technical advantages:
a.Permanent and all-structural recovery is applicable to those whose pipe diameter is 0.25m-4.0m;
b. Fully automatic two-way rotary centrifugal spraying has even and compact coating;
c.Lining thickness may be flexibly designed concerning pipe diameter, buried depth, underground water, geology, pipeline damage and other situations and lining thickness may change in any pipe section, minimizing recovery cost;
d. Small dimensions in spray equipment with low one-off investment cost.
e.Its recovery structure is waterproof, corrosion-proof and free from reduction of overflow capacity, whose service life can be over 50 years in design;
Representative projects: Repair for Rainwater and Sewage Inspection Well in South Street, Xi'an; Repair for Inspection Well in North Xiti Road, Chengdu, etc.
