InfraSteel Installation Process
Slip lining with InfraSteel is a safe, environmentally friendly, and structurally superior way to rehabilitate failing culverts. We provide a template of the determined liner shape and size, for the installer to pass through the existing structure, and to help line up the installation process.
- Begin by tack welding the pipe, starting on the bottom, every 6 inches once it is aligned. The welders should work from the bottom of the pipe, working upwards to the top. Porta Power tools, wedges and modified C clamps may be required to manipulate the steel for alignment.
- The bracing inside of the liner should be used as a visual tool to aid in alignment; think of aligning the crosshairs of a scope when setting the piece into position. When welding one piece to another piece use the longitudinal weld seams in the haunches, where the bottom half is welded to the top half, for alignment. There is also a mark at 12:00 and 6:00 center on each piece for alignment.
- Ears or Tabs may be welded on the top of one piece so it can be hung on the next piece while they are being aligned.
- Grout Ports should be added every 10’ at 12:00, 3:00, and 9:00. As grout is being pumped into the downstream end the grout will fill up the annular space moving up hill. As the grout moves uphill the next grout port will be used as a vent to indicate how far up the grout has moved, and should be plugged when grout reaches it. Additional grout ports should be used as needed and can be added anywhere that grout is needed to fill voids. Grout pressure should not exceed 3.5 psi at point of injection.
- The bracing inside of the pipe should not be removed until the grouting process is completed.
- The lead piece of pipe may be tapered inward as necessary; with longitudinal cuts 3” to 4” long every 6 inches, to facilitate the slip lining process. We manufacture tapered lead sections upon request. Tracks may be welded to the bottom of the host pipe to facilitate the slip lining process.
- Arched pipe with a flat bottom is more prone to float when grout is being pumped than pipe with a radius on the bottom. If necessary, spacers may be added to keep the liner from floating, prior to grouting, by cutting a hole in the top of the pipe, and welding in a steel spacer that runs from the top of the liner to the ID of the host pipe structure.
- The liner may be welded and pushed into place, or be loaded into the host pipe structure one piece at a time, and welded from inside of the liner. The liner may be beveled for welding from the OD, the ID, or with an OD/ID combination that allows for the bottom only to be welded from the inside.
Limited Warranty: InfraSteel is manufactured for each specific purchase and is warranted only to the extent that it is proven to be defective in material or workmanship prior to installation. Damage due to installation or grouting is not warranted. If the product is deemed defective, the purchaser should provide immediate written notice of the defect and provide an opportunity for inspection by an InfraSteel representative. The InfraSteel product will be repaired on site, repaired at the plant, or replaced at InfraSteel’s discretion, to the satisfaction of the purchaser.