1.1 This practice describes the procedures for reconstruction of the lateral-mainline connection and interface area by insitu-robotic methodologies for the injection of a silica-based resin. The resins injected into the interface area to include soils/bedding/voids surrounding the lateral mainline interface re-establish bedding and spring-line support providing a permanent, structural repair that arrests infiltration and root intrusion (Fig. 1). Specialized cutting equipment mills away pipe surfaces in preparation for the injection of resins, preparing the interface with pathways for resin to penetrate the soils and voids surrounding the interface. The same resins provide new pipe wall surface where pipe was milled away. 1.2 The purpose of the resin is 1) to introduce the resins to the voids and soils surrounding the interface to re-stabilize the lateral bedding and provide spring-line support for the lateral pipe at the connection; 2) to reconstruct the holes, cracks, and missing walls of lateral pipe by application of resin which bonds to the lateral and/or mainline pipe; 3) to fill the annular space between the liner and mainline host pipe with resin to stop infiltration into the mainline; 4) to stop root intrusion; 5) to create structural integration between the resin-filled bedding, new resin pipe wall and, if required, the annular space between the liner and host pipe; 6) to stop inflow and infiltration of ground water from the surrounding water table or in the annular space and also stop ex-filtration. See Fig. 2. 1.3 This practice applies to sewers 8 to 24 in. in diameter and can be employed in lined or unlined pipe. Application of this practice is recommended after lining of mainline and lateral pipe. 1.4 The renovation shall be considered one continuous step consisting of lateral preparation cutting and the injection process whereby a packer is placed within the mainline at the lateral opening. Resin is injected and cured and the packer is removed from the finished lateral-mainline renovation. 1.5 Worker safety training should be include reviewing the hazards associated with handling resins, pumps, hoses, tanks, valves and containers and all other related application apparatus. Additional safety handling, mixing and transporting of resins should be provided by the resin manufacturer and/or supplier. Safety procedures and practices should be described in detail including personal protection equipment and proper storage. 1.6 This standard does not purport to address all of the safety concerns, is any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Laterals where bedding/soils have been washed away need spring line support to be re-established to prevent further degradation. Practice will be applied through rehabilitation contractors. For use by municipal authorities and agencies in wastewater collection systems.
Keywordsconnection sealing; interface sealing; bedding reinforcement; structural support; resin bonding;
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development