Award Bid - 2024 Sewer and Manhole Rehabilitation Proj No. 122-019 - Visu-Sewer, LLC

Home Browse Search

All liners must be attached with a minimum of two 3/4" stainless steel doubled banding straps placed between the grooves of welded beads placed on the surface of the cone. Always protect the liner from the banding straps with 1.5 - 2.0 inch strips of 3 mm felt or liner material placed between the turned back liner and the banding strap. Failure to place the padding under the banding straps and buckle may result in cuts in the liner as the column fills with water and puts pressure against the banding strap. Always place the banding straps between the welded beads ringed around the face of the cone to prevent the liner from slipping off the face of the column. Complete the procedure by wrapping duct tape around the bands and banding buckles. Attachment of Lay Flat and Hold Back Rope -- Always use separate ropes for the hold back and the circulation hose(s). Also ensure that the rope being used is strong enough to withstand the forces that may be exerted on them. For example, just ten feet of water on a 36-inch diameter tube will generate several thousand pounds of force on the hold back rope. Start by using several 0.375-inch nylon ropes tied just behind the end piece. Use two ropes for attachment of the hold back rope and two ropes for attachment to the circulation hose. Duplication of the rope ties provides additional safety in the event any of the knots become detached. If two circulation hoses are used attach this discharge hose in a similar manner. Allow the rope to be long enough such that the hold back rope and circulation hose will be approximately 12 inches behind the end piece. LINER PLACEMENT Off-Loading Tube from Truck -- Pull the tube off the truck manually one fold at a time. If the tube is not pulling easily or is of a size that it is pulling with difficulty, the tube must be unloaded with the use of a winch system or boom truck. High pulling forces placed on the tube may result in unnecessary stretching. End Restraints and Bulk Heading -- Provisions must be made to restrain the end of the resin saturated tube at the downstream manhole and at any intermediate manholes. Failure to restrain the tube may result in unnecessary stretching or rupture of the liner. THERMOCOUPLES Placement -- While inverting the liner, thermocouples must be placed between the resin saturated tube and the host pipe. It is recommended that thermocouples be placed on the top and bottom of the tube at the upstream and downstream manholes, as well as in any intermediate manholes. In addition, a small diameter spike attached to a heater hose that is longer than the depth of the manhole should be pierced into the end of the installed lining tube. This should be placed at the bottom of the liner or as close to the bottom as possible. A thermocouple or twisted thermocouple wire may then be placed into the end of the heater hose. A small stream of installation water from the lining tube is allowed to bleed out of the heater hose, thereby allowing the downstream water temperature in the liner to also be measured during the installation. The tube also allows any trapped air at the end of the liner to be released, which further optimizes the heating and curing process at the end of the tube. Recording Times -- A hand held thermocouple recording device should be used to measure all temperature readings during the curing and cooling procedure. All thermocouple readings and the temperature of the circulating water should be recorded every 15 minutes if possible, but no less than every 30 minutes. All readings monitored with a hand held thermocouple recording device should be recorded on a curing record as a function of time that is a permanent part of the documentation related to the installation.