How To Repair Concrete Storm Pipe

A city in the Midwestern Corn Belt installed a new 84-in. reinforced concrete pipage (RCP) storm sewer collection system in the early 1990s to provide relief from flooding. RCP has, for many years, had a reputation of having weak or inconsistent joints. The concrete pipe industry every bit a whole has designed and built joints to meet certain standards; all the same, proper installation techniques need to be employed, and workers must be trained to ensure a quality installation of the piping arrangement.

This RCP storm sewer was installed in a historic role of the metropolis and was designed using a confined O-band gasketed joint. These O-ring joints see the strict requirements of ASTM Specifications C361, Reinforced Physical Low-Head Pressure Piping; and C443, Joints for Circular Concrete Sewer and Culvert Pipe, using flexible, watertight rubber gaskets. They also meet the requirements of the Bureau of Reclamation specification for the type R-4 joint and are suited for reliable, yet economic transmission of water at internal pressure heads of upward to 125 ft.

The pipage was designed to exist watertight and provide many years of service, but it began to testify signs of infiltration and exfiltration through the joints almost immediately. It became apparent that there had been problems during installation of the pipe, and the city now was faced with the challenge of how to repair a concrete storm pipe and finding a solution to seal approximately 230 joints in the pipe segment.

Solution – Concrete Pipe Articulation Repair

Traditional repair methods such as excavation were not an economical option, so the city researched a variety of trenchless methods to make the reinforced concrete pipe repair from the within of the pipe, including chemical grout, cured in place pipe (CIPP) and mechanical internal joint seals. In 2010, the city decided to do a trial installation of the HydraTite internal articulation seal system for the purposes of evaluation. Ii 84-in. HydraTite internal articulation seals were furnished and installed by Cretex Specialty Products, a distributor of manhole and pipe articulation sealing technologies located in Waukesha, Wisconsin. After approximately six years of successful service on the two trial seal installations, the city hired a consulting engineer to pattern, bid and construct the repairs utilizing the HydraTite internal articulation seal system.

In the fall of 2016 the project was put to public bid and awarded to the low bidder, HydraTech Field Services LLC of Cincinnati. The bid included furnishing and installing 231 HydraTite internal joint seals of varying sizes, including 215 84-in., one 72-in., x 60-in. and five 48-in. seals. At that place as well were bid items for traffic control, tempest sewer cleaning, lift pigsty patching, manhole chimney rehabilitation and other miscellaneous items.

Installation

Work commenced in mid-January 2017, starting with a preconstruction coming together held with the urban center, the engineering business firm and the contractors. Traffic command was so ready, and the sewer-cleaning contractor started the process of removing sediment from the 84-in. line. In conjunction with the cleaning, all the lift holes in the pipe segments were filled with a non-shrink repair mortar during the reinforced concrete pipe repair. Access to the tempest sewer for the textile, tools, equipment and coiffure personnel was through a single 2.five-ft-by-3.5-ft entryway in the roadway, which posed no bug for the HydraTite system. Afterwards the first portion of the piping was cleaned, the HydraTite internal joint seals, retaining bands and tools were loaded into the piping through the access point and the installation process commenced.

The system of installation required that technicians verified a proper sealing surface for the seal to comprehend over the joint and repaired if necessary. Each joint was air tested for leakage and was inspected by the engineering firm to verify that it was watertight and free of whatsoever leaks. During the eight-calendar week project, there were some delays due to weather events such as snow and rain. On those days, the HydraTite seal installation was not performed due to higher than normal menstruation in the pipe; nonetheless, the project was still completed on fourth dimension.

Results

Since the project was completed in April 2017, the area has non experienced whatever of the infiltration or exfiltration problems previously found in this storm sewer collection organisation.

Source: https://www.estormwater.com/channel/casestudies/mechanical-joint-sealing-system-helps-repair-rcp-storm-sewer

Posted by: littlediesse.blogspot.com

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