Trenchless Technology

SEP 2018

Trenchless Technology is the premier communications vehicle for the trenchless industry. Through our multiple platforms, readers receive insights into the trenchless industry, as well as keep connected to the latest news, products and projects.

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SPREX Technology SPREX is a trenchless rehabilitation solution utilizing wound PVC to form a structural liner inside a deteriorated pipeline. This method currently re- news gravity pipeline networks; such as sewers, storm drains and culverts. SPREX conforms to ASTM F1697 and ASTM F1741, which de†ine standard practices for machine installations of spirally wound PVC . The SPREX installation process consists of a single strip of PVC pro - †ile which is fed from an above ground spool into the winding machine lo - cated at the base of the manhole or access chamber. The winding equip - ment spirally winds the PVC pro†ile strip into the deteriorated pipeline at a diameter initially smaller than the host pipe. The pro†ile forms the liner by locking together in a spiral fashion using the two locking mechanisms on the pro†ile's edge. The secondary lock is then cut once winding has stopped, allowing the liner to expand and tight- ly †it against the host pipe. Sekisui SPREX liners offer San Di- ego numerous design and constructa- bility advantages. First , the mechani- cal installation process allows for Spiral Wound liners to be installed in live †low, typically without the need for bypass pumping . There is no ad- verse effect on the installation equip - ment or pro†ile when exposed to †low. Additionally, as there is no sty- rene or contaminated process waters to dispose of, Sekisui Spiral Wound liners are safe to install even in en- vironmentally sensitive areas. The construction footprint is small and the installation is fast and ef†icient . Furthermore, laterals can be imme - diately re -instated as there is no wait time for liners to cure or cool down which minimizes the social impact to residences and businesses. All these constructability advantages have provided the City with a cost- effec- tive repair alternative to more ex- pensive dig and replace construction practices as well as other trenchless rehabilitation methods. Jacquie Jaques regional manager at Sekisui SPR Americas LLC. W W W.T R E N C H L E S S T EC H N O LO GY.C O M 59 Though the mandatory repairs as outlined in the EPA Consent Decree were completed in 2015, the City continues a robust rehabilitation schedule. The current Capital Improvement program is funded through 2024 with an annual goal of 40 to 45 miles of sewer to be replaced or rehabilitated per year. With the cost savings associated with trenchless technologies, the focus is to use structural liners where possible.

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