Trenchless rehabilitation

October 2007 » PROGRESSIVE ENGINEERING TECHNOLOGY
Cured-in-place pipe (CIPP), sliplining, pipe bursting, and spray lining are just some of the trenchless methods and technologies available in an engineer’s toolbox.
CE News Staff
Cured-in-place pipe (CIPP), sliplining, pipe bursting, and spray lining are just some of the trenchless methods and technologies available in an engineer’s toolbox for maintaining and rehabilitating wastewater and stormwater pipelines and manholes. Corrosion prevention and inspection systems are also important to the effort. In response to a request from CE News, companies provided the following information about their products.

CCI Spectrum’s SpectraShield Liner System comprises a spray-applied silicone-modified polyurea that is used to rehabilitate and protect wastewater structures such as manholes, wet wells, or wastewater treatment plant facilities. Following preparation, the lining process begins with a moisture-barrier coat of the silicone-modified polyurea. Next, a surfacing coat of closed cell foam is applied to fill voids, eroded areas, bugholes, and missing mortar joints. Then, a second barrier coat of the silicone-modified polyurea provides the third layer of the multi-layer stress skin panel. According to the company, SpectraShield stops groundwater infiltration, prevents corrosion, imparts structural strength, and can be installed in any shape or configuration. Fast curing allows lining of a typical, 7-foot-deep manhole in less than one hour, the company says.
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CertainTeed Corporation introduced CertaFlo GreenLine, a high-impact polyvinyl chloride (PVC) pipe for trenchless pipebursting applications that features the company’s Certa-Lok Integral Bell restrained joint system. CertaFlo GreenLine comes in shorter 10-foot and 13-foot lengths that facilitate rapid assembly and allow use of smaller and more economical construction pit sizes in trenchless applications. According to the company, the code-approved light-green pipe color makes camera inspection of sewers easier. CertaFlo GreenLine is corrosion resistant, lightweight, holds its grade because of the stiffness of PVC, conforms to ASTM D2241, and requires no solvent cements or costly butt fusion equipment.
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ConMICShield Technologies, Inc., offers ConMICShield for preventing microbiologically induced corrosion (MIC) commonly developed in concrete sewer pipe and manholes. According to the company, it prevents acid-producing bacteria (Thiobacillus) from colonizing into concentrations that produce sulfuric acid. ConMICShield is added to the concrete mix during precasting. Unlike coatings or plastic linings, ConMICShield molecularly bonds to the cement particles, so it cannot wash off, chip off, peel off, delaminate, or pinhole. It has been used in both new precast manholes and in rehabilitation of existing manholes.
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CONTECH Construction Products says it A2 Liner Pipe can provide a 50-percent cost savings compared with CIPP, depending on the installation. Relining with A2 Liner eliminates costly bypass operations because normal pipeline flow is maintained. Additionally, sliplining with A2 Liner provides a new pipe with direct-bury strength of 46 psi stiffness that doesn’t depend on the host pipe for long-term structural performance. A double-wall design provides extra stiffness for improved shape-control during installation and grouting. A glossy-smooth interior with a Manning’s "n" of 0.009, restores hydraulic capacity, allowing the relined pipe to carry as much or more flow than the existing host pipe, even with diameter reductions. CONTECH provides A2 Liner in 12- to 36-inch diameters and lengths of 10 feet and 20 feet. Custom lengths as short as 2.5 feet are available for installation within small insertion pits or manholes.
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Containment Solutions, Inc. (CSI), Rehabilitation Manholes are made of non-corroding fiberglass and are designed for installation within an existing concrete, brick, or precast manhole. The manhole is a single structural unit providing a long-term and cost-effective solution to manhole rehabilitation. With its monolith design, the CSI Rehabilitation Manhole is able to withstand H-20 traffic loads, according to the company. It is built water tight and strong but is still lightweight for easy installation. Installation can often be accomplished without sewage bypassing or diversion and with minimum disruption of street traffic.
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Danby of North America, Inc., says its pipe renovation system provides a cost-effective solution for rehabilitating large-diameter culverts and storm drains. The Danby grouted-in-place-liner system can rehab culverts and drains 36 inches in diameter or larger, in any shape (oval, arch, circular), and made of any material (corrugated metal pipe, reinforced concrete pipe, brick, stone). The Danby system can be designed to provide structural renovation or simply to increase flow capacity with its smooth PVC liner.
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East Jordan Iron Works, Inc.’s new Revolution manhole frame and cover features a lid that pivots away from the hole opening. This allows for routine access and maintenance, eliminating the need to raise or lower the lid manually. The cover rotates on a stainless steel pin that ensures it remains attached to the frame. The Revolution unit was designed for use in elevated manhole applications such as outfalls, where the access cover can be as much as 4 feet above the ground. Security bolting is optional.
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New laser and sonar profiling tools from Envirosight integrate with ROVVER and SuperVision inspection crawlers, allowing them to analyze pipe for indications of deformation, corrosion, debris accumulation, and improper liner installation. The laser profiler works above flow lines and the sonar profiler works below. Each can be used individually, or both simultaneously. The profilers come with software to generate reports. The profiling hardware consists of a probe that attaches to the head of a ROVVER or SuperVision camera. No modification of the crawler is required. The probe is fitted with a laser or sonar profiler, or both. Together with the included profiling software, the probe measures the diameter and concentricity of pipe 4 to 160 inches in diameter, performing as many as 250,000 measurements per minute with ±1-percent accuracy, according to Envirosight. Standard reports track a pipe’s true diameter, ovality (per ASTM 1216), capacity, x/y diameter, and maximum diameter. The software can generate a 3-D representation of the pipe, with variations in the pipe wall shown in sharp relief for visual analysis. Additional reports are available addressing corrosion, structural cracking, debris, and consistency of relining (before and after).
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HOBAS Pipe USA offers pipe with high strength-to-weight ratio; smooth surface; and flush, push-together joints that the company says make it ideal for sliplining. Its hydraulic characteristics provide maximum flow recovery. The centrifugally cast, fiberglass-reinforced, polymer mortar pipe is inherently corrosion resistant. Smaller installation pits and longer pushes minimize surface disruption. Non-pressure and pressure classes are manufactured in diameters ranging from 18 inches to the newly introduced 110-inch pipe.
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Inliner Technologies, LLC says its CIPP renewal products have been used to line more than 9 million feet of mainline and lateral pipelines. The company uses inversion techniques as described in ASTM F1216, as well as a patented method of pulling in and inflating the product as specified in ASTM F1743. According to the company, the nonwoven tubes used as the backbone of the Inliner process are engineered to minimize stretch during either installation method, while protecting the resin from washout and contamination. Curing of Inliner CIPP renewal products can be accomplished by either hot water or hot air/steam, as dictated by the jobsite conditions or the owner’s request. Inliner Technologies LLC has patented a method of curing with hot air and pressure.
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Insituform Technologies, Inc., is set to launch iPlus Infusion, a next-generation CIPP solution for small-diameter pipelines, at WEFTEC 2007, Oct. 15 in San Diego. According to the company, iPlus Infusion, the newest member of Insituform’s iPlus family of products and solutions, is proven to be more reliable and efficient in the field. It also performs at high levels in strict leak-tightness testing. The iPlus family also includes iPlus Composite, Insituform’s next-generation CIPP solution for medium- and large-diameter pipes. iPlus Composite pipe is reinforced with carbon or glass fibers to increase strength while reducing thickness, increasing both flow and capacity.
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The Janssen Process Company, distributors of patented technologies for structurally renovating sewer laterals, entered into a technical support agreement with New Jersey-based Envirosight under which Janssen’s licensed contractors will receive technical support and training through Envirosight’s national network of service partners. According to Janssen, introduction of its technology coincides with a rapidly growing trend in the industry: More engineers and operations managers are requiring that damaged service laterals be specified along with mainline and manhole rehabilitation projects. The Janssen technology renovates damaged and leaking lateral connections at the main using patented delivery systems for injecting silica-based resins to re-connect the lateral structurally to the mainline.
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Ladtech, Inc.’s high-density polyethylene (HDPE) Ladtech Adjusting Rings for rebuilding manhole chimneys are made from recycled #2 plastic bottles. According to the company, they have been tested to AASHTO’s HS-25 wheel-loading specification and for a functional temperature range of -20 to +265 degrees F. Each ring weighs only 6 pounds and is adhered in place and sealed using a butyl rubber chalk. Ladtech says a manhole chimney built with its HDPE rings can be installed in 20 minutes and almost immediately backfilled.
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National Liner’s Lateral Lining System is a flexible, no-dig pipe rehabilitation technology that can be applied to a variety of lateral systems. It is designed to be installed prior to the CIPP lining of the mainline, but the Lateral Lining System can also be installed after mainline rehabilitation. Since it is installed from the mainline, the system can be fitted with or without a clean-out. When installed prior to CIPP lining of the main, a stainless steel collar (S COLLAR) is inserted at the lateral connection to protect the CIPP main liner against damage at the joint that could be caused by the robotic cutter during reinstatement of the service connection.
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RIBLOC’s Ribline pipe rehabilitation process (offered in the United States by CPT-USA) consists of a single strip of steel-reinforced HDPE profile that is progressively wound into the existing pipeline by the Ribline machine. The winding machine, lowered into the base of the access chamber through standard manhole openings, extrusion welds the edges of the profile together to form a continuous watertight liner. According to the company, Ribline liners can structurally rehabilitate sanitary sewer and stormwater pipelines with diameters ranging from 16 inches to 120 inches. The annulus between the line and the host pipe can be filled with grout.
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